List of Documents for initial Load Testing of Pile …engineeringprojects.com/Tender/UploadFiles/ESIC... · Web viewSteel : Steel shall conform to IS 1786, (TATA or SAIL) Bentonite

List of Documents for Initial Load Testing of Pile including Construction of Test Piles for Proposed ESIC & ESIMB Building at GB Block, Sector -III, salt

Lake City, Kolkata

NIT No. ERO/MMD/ESI/0808A

Sl.No. Description Annexure

1. Notice Inviting Tender I

2. Instructions to Tenderers & General Conditions of Contract

II

3. Additional Conditions of Contract III

4. Technical Specifications and Tender Drawing

IV

5. Form of Price Bid V

6. Bill of Quantities VI

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ANNEXURE – I

INITIAL LOAD TESTING OF PILE INCLUDING CONSTRUCTIONOF TEST PILES FOR PROPOSED ESIC & ESIMB BUILDING AT

GB BLOCK, SECTOR -III, SALT LAKE CITY, KOLKATA

(NIT No. ERO/MMD/ESI/0808A)

NOTICE INVITING TENDER


ENGINEERING PROJECTS (INDIA) LTD.( A Govt. of India Enterprise )

********

NOTICE INVITING TENDER

Tender for Initial Load Testing of Pile Including Construction of Test Piles For Proposed ESIC & ESIMB Building At GB Block, Sector -III Salt Lake City, Kolkata.

ERO/MMD/ESI/0808A 10.12.2008

1.0 Employees State Insurance Corporation (ESIC) Kolkata has decided to construct Initial Load Testing of Pile Including Construction of Test Piles for Proposed ESIC & ESIMB Building At GB Block, Sector -III Salt Lake City, Kolkata

Sealed percentage rate tender is invited by Engineering Projects (India) Ltd.l as per the brief particulars of scope mentioned hereinafter, from eligible contractors for Initial Load Testing of Pile Including Construction of Test Piles for construction of Proposed ESIC & ESIMB Building At GB Block, Sector -III Salt Lake City, Kolkata

.

The detailed scope of work is given in the tender documents.

Time schedule of tender activities:

I) Date & Time of sale of Tender Documents: From 10.12.08 to 15.12.08 11.00 AM to 05.00 PM

II) Last Date & Time of submission of Tenders : 16.12.08 at 12.00 Noon

III) Date & Time of Opening of Tender : 16.12.2008 at 3.00 pm (Techno-Commercial Bid)

Contractors who fulfill the following basic qualifying requirements are eligible to participate in this tender. The joint ventures are not accepted.

a) Should have completed /substantially completed during last 7 years following “similar works” out of which at least one work should be with Central/State Government Deptt. / Agency/PSU i.e. completed after 01.03.2001).


i) Three works valuing at least 30% of this estimated cost of this works..

ORii) Two works valuing at least 40% of this estimated cost of this works.

OR

iii) One work valuing at least 70% of this estimated cost of this works.

a. The ‘similar works” shall mean “buildings and associated works”

b. The substantially completed work shall be the work where at least 80% bill of

total awarded value has been achieved.

c. For evaluation purpose, the completion cost of works mentioned in the

Completion Certificate shall be enhanced by 10% per annum (till 29.02.2008)

d. The cost of free issue materials shall not be included in the completion cost of

works.

b) Should have had Average Annual Financial Turnover of not less than 30% of the estimated cost in the last three years ending 31.03.2008 duly certified by a Chartered Accountant.

c) Should not have incurred any loss in more than two years during the last five years

ending 31.03.2008. Copies of balance sheet /certified from Chartered Accountant to be submitted.

d) Should have a solvency of 40% of the estimated cost issued by a Bank.. The Solvency Certificate should not have been issued earlier than one year of last date of submission of the tender.

e) Should have valid Permanent Account Number of Income Tax.

f) Should have valid PF Registration No.

g) Should have valid VAT Registration No.

EPI’s empanelled contractors can also participate in the tender provided they fulfill the above qualifying requirements. Non-empanelled contractors shall get themselves registered before placement of LOI/work order.

2.0 Estimated Cost of the Work is Rs. 9,82,836.30 (Rupees Nine lakhs Eighty Two Thousand Eight Hundred Thirty Six & Paise Thirty only)

3.0 Time for carrying out the work will be 02 (Two) months.


4.0 Tender documents can be directly downloaded from the website or can be obtained from the office of General Manager (MMD-Contracts), Engineering Projects (India) Ltd, 8 th Floor, 50, Chowringhee Road, Kolkata – 700071 from 11.00 AM to 05.00 PM on all working days (Monday to Friday) except Public Holidays, on submission of request letter along with relevant experience certificates and other documents as mentioned above (Cl 1.0 (a) to 1.0 (d) duly attested by Gazetted Officer not below the rank of Executive Engineer or equivalent or Notary Public) fulfilling the qualifying criteria. Tender document shall be issued to eligible prima-facie qualified bidders on payment of Rs. 250/- (Rupees two hundred & fifty only) (Non-Refundable) by Crossed Demand Draft favoring “Engineering Projects (India) Ltd.” payable at Kolkata, Issuance of Tender Documents to any tenderer shall, however not construe that the tenderer is considered qualified for the tender work and the same may be rejected, if on detailed scrutiny, the documents submitted alongwith the tender are found to be unsatisfactory. In case the tender documents have been directly downloaded from the website, the tenderer shall submit the cost of tender document of Rs. 250/- (Rupees two hundred & fifty only) in the manner specified above in a separate envelope and attach the envelope outside the envelope containing his tender.

5.0 All Tenders shall be accompanied by Earnest Money Deposit (EMD) of Rs. 19,656.00 (Rupees Nineteen Thousand Six Hundred & Fifty Six only) This can be either in the form of Crossed Demand Draft or Pay Order of any Nationalized Bank / Scheduled Bank for the full amount of EMD payable favoring, “Engineering Projects (India) Ltd.” payable at Kolkata or in the form of Bank Guarantee of any Nationalized Bank / Scheduled Banks, in accordance with the prescribed proforma. The EMD shall be valid for minimum period of 150 days (One hundred fifty days) from the last day of submission of Tender. Tenders submitted without EMD or with inadequate amount of EMD shall be rejected.

6.0 The Terms & Conditions contained in this NIT and tender documents shall be applicable.

7.0 EPI reserves the right to accept any tender or reject any or all tenders or annul this tendering process without assigning any reason and liability whatsoever and to re-invite tender at its sole discretion. The corrigendum, extension, cancellation of this NIT, if any, shall be given on EPI’s webside www.engineeringprojects.com only. The intending tenderers are requested to visit EPI’s website regularly for this purpose.

The tender documents shall be submitted to :General Manager (MMD-Contracts)

Engineering Projects (India) Ltd.Eastern Regional Office50, Chowringhee Road,

8th FloorKolkata – 700071

Tel No. 033 – 22824426 / 27 / 29FAX No. 033 – 22824428

General Manager (MMD – Contracts)


http://www.engineeringprojects.com/

ANNEXURE – II

INITIAL LOAD TESTING OF PILE INCLUDING CONSTRUCTION OF TEST PILES FOR PROPOSED ESIC & ESIMB BUILDING AT GB BLOCK, SECTOR - III, SALT LAKE CITY, KOLKATA


INSTRUCTIONS TO TENDERERS& GENERAL CONDITIONS OF

CONTRACT


MEMORANDUM

(ENCLOSURE TO FORM OF TENDER )

REF : TENDER FOR INITIAL LOAD TESTING OF PILE INCLUDING CONSTRUCTION OF TEST PILES FOR PROPOSED ESIC & ESIMB BUILDING AT GB BLOCK, SECTOR -III, SALT LAKE CITY, KOLKATA


Sl.No.

Description Cl. No.

Value/Description to be applicable for relevant clause(s)

i) Name of work : Initial Load Testing Of Pile Including Construction Of Test Piles For Proposed ESIC & ESIMB Building at GB Block, Sector -III, Salt Lake City, Kolkata

ii) Client/Owner/Employer Employees State Insurance Corporation

iii) Type of Tender Percentage Rate

IV) Earnest Money Deposit NIT Rs.19,656.00 (Rupees Nineteen thousand Six Hundred & Fifty Six only)

V) Estimated Cost NIT Rs.9,82,836.30 (Rupees Nine lakhs Eighty Two Thousand Eight Hundred Thirty Six & Paise Thirty only)

VI) Time for completion of work

NIT Total work to be completed in 02 (two) Months in accordance with the time schedule of completion of work in the tender documents.

VII) Mobilization Advance 8.0 Nil

VIII) Interest Rate on Mobilisation Advance

8.0 Not applicable

IX) Number of installments for recovery of Mobilisation Advance

8.0 Not applicable

X) Schedule of Rates applicable

69.0 Civil works : DSR 2007

XI) Validity of Tender 4.0 90 (Ninety) Days

XII) Security Deposit cum 9.0 5.0 (five Percent only) of contract value within 10 days from


Performance Guarantee the date of issue telegram/letter/Telex/Fax of Intent of acceptance of tender.

XIII) Retention Money 10,.0 5.00% (Five percent only) of the contract amount, which shall be deducted in the manner set out in this contract.

XIV) Time allowed for starting the work

43.0 The date of start of contract shall be reckoned 10 days from the date of issue of telegram/letter/Telex/Fax of Intent of acceptance of tender.

XV) Defect Liability Period 74.0 12 (Twelve) Months from the date of taking over of works.

XVI Arbitration 76 Arbitration shall be as per provisions of Clauses no. 76 of GCC. The Venue of Arbitration shall be Kolkata

XVII Jurisdiction 76.3 Courts in Kolkata

SIGNATURE OF TENDERER _________________________________

NAME (CAPITAL LETTERS) _________________________________

OCCUPATION _________________________________

ADDRESS ___________________________________


Annexure - III

INITIAL LOAD TESTING OF PILE INCLUDING CONSTRUCTION OF TEST PILES FOR PROPOSED ESIC & ESIMB BUILDING AT GB BLOCK,

SECTOR -III, SALT LAKE CITY, KOLKATA


ADDITIONAL CONDITIONS OF CONTRACT


Annexure - III

ADDITIONAL CONDITIONS OF CONTRACT

1.0 These Additional Conditions of Contract (ACC) shall be read in conjunction with General Conditions of Contract (GCC).The provisions in these Additional Condition of Contract supersede the provisions of General Conditions of Contract wherever they are at variance.

2.0. INTRODUCTION

The site is located at GB Block, Sector – III, Salt Lake City, Kolkata

3. 0 SCOPE OF WORK

The brief scope of work consists of the following:

i) Construction of 600mm dia & 750 mm dia bored cast-in-situ test pipes and other allied works specified in the schedule of works/bill of quantities.

The work is to be carried out on item rate basis as per bill of quantities and tender conditions.

4.0. QUALIFICATION OF TENDERERS

To be eligible for this tender the bidders should fulfill the requirements for eligibility as mentioned in the Notice Inviting Tender (NIT) and should submit detailed data and credentials set out in Cl. 19.0 of NIT (Vol.-I) NIT ( ) of the Tender. The Tenderers are required to fulfill all the eligibility criteria as stipulated in NIT and elsewhere in the Tender documents. The price bid of tenderers who fulfill the eligibility criteria as per evaluation of EPI shall only be opened. The decision of EPI in this regard shall be final & binding on the tenderers

5.0 DISQUALIFICATION

The tenderers may note that they are liable to be disqualified and not considered for the opening of Price Bid if;

a) Representation in the forms, statements and attachments submitted in the pre-qualification document are proved to be incorrect, false and misleading

Contd…III/2

-: III/2: -


b) They have record of poor performance during the past 10 years such as abandoning the work, rescinding of contract for which the reasons are attributable to the non-performance of the contractor, inordinate delay in completion, consistent history of litigation /arbitration awarded against the contractor or any of its constituents or financial failures due to bankruptcy etc. in their on going/past projects.

c) They have submitted incompletely filled formats without attaching certified supporting documents and credentials to establish their eligibility to participate in the Tender

d) If the tenderers attempt to influence any member of the selection committee.

EPI reserves its right to take appropriate action including disqualification of tenderer(s) as may be deemed fit and proper by EPI at any time without giving any notice to the contractor in this regard. The decision of EPI in the matter of disqualification shall be final and binding on the Tenderers.

6.0 The work in general shall be carried out as per the technical specifications given at Annexure-IV to be read in conjunction with specifications described under Bill of Quantities enclosed at Annexure-VI.

7.0 The clause no. 72.1 of GCC shall be replaced as under :

The Contractor shall ensure adequate progress during the execution of work so that the activities are completed in the period allowed in the completion schedule as given at sl. no. 9.0 of Additional Conditions of Contract (ACC).

If the contractor fails to maintain the above progress or to complete the work and clear the site on or before the contract or extended date of completion he shall without prejudice to any other right or remedy of the EPI on account of such breach, pay as agreed compensation and not as penalty at the rate of half percent (1/2%) per every week of delay of the value of the work awarded to him.

The total amount of compensation payable by the contractor for delay in stage-wise completion or completion of the whole work shall not exceed 10% of the total contract value as awarded.

8.0 Clause no. 72.4.1 of GCC stands modified as under:

Within 10 (Ten) days of date of Letter of Intent, the contractor shall submit a Time and Progress Chart (CPM/PEERT/Quantified Bar Chart) and get it approved by the Engineer-in-Charge. The Chart shall be prepared in direct relation to the time

Contd…III/3.

-III/3-

stated in the contract documents for completion of items/scope of the work. It shall indicate the forecast (mile stones) of the dates of commencement and completion of


various items trade sections of the work and may be amended as necessary by agreement between Engineer-in-charge and the Contractor within the limitations of time imposed in the contract documents to ensure good progress during the execution of the work. The contractor on the prescribed format shall submit the physical report including photographs & the intervals (not later than a months) as decided by the Engineer-in Charge. The compensation for delay as per clause 72.1 (revised as per ACC) shall be leviable at intermediate stages also, in case the required progress is not achieved to meet the time deadlines of the completion period and/or milestones of time and progress chart provided always that the total amount of compensation for delay to be paid under this condition shall not exceed 10% of the tendered value of work.

In case entire work is completed within the total time period of completion or extended period of completion allowed, the compensation for delay due to not achieving progress at intermediates stage, if any, shall be refunded without any interest charges.

9.0 Completion schedule: Enclosed Annexure-A

10.0 The clause no. 28.3 shall be read amended to the extent as below:

The contractor at his own cost within 7 days of receipt of the order will establish a temporary office at site furnished with at least two numbers of moulded chairs, one number of caned arm steel chair alongwith electricity and drinking water and a small table. These furniture shall be the property of the contractor on completion of work. The contractor shall also make necessary arrangement for photography of the work site at least once during driving of pile and once during load testing.

11.0 The final bill will be submitted by the contractor within 90 days from the date of acceptance of completion of work accompanied by the following documents:

a) Load test reportsb) No claim certificate by the contractor.c) No claim certificate from the sub-agencies/vendors engaged by the contractor.d) Calibration certificates of the instruments used in carrying out the load test.

Contd…III/4.

-III/4-

12.0 No secured advance shall be paid to the contractor for the materials/articles brought by him for incorporation in the works. The clause no. 35.0 of the GCC shall accordingly stand deleted.


13.0 The contractor shall be responsible for all protection of sanitary, water supply, electrical fittings and fixtures against pilferage, breakage during period of installation until the completion and handing over to EPI.

14.0 The contractor, if not already registered with EPI, shall be required to get registered with EPI after furnishing the required information as required in the prescribed form of registration and on submitting the required registration fee.

15.0. No mobilisation advance shall be given to the contractor. The clause no. 8.0 of GCC accordingly shall stand deleted.

16.0 The contractor shall be required to make at his costs a necessary safety arrangement at site includ8ing as mentioned in the GCC and keep EPI indemnified against all consequences arising out of accidents, if any, at the work site.

17.0 EPI is awarding this contract on behalf of Employees Ste Insurance Corporation (ESIC ), the owner. In case M/s. EPI ceases to or exits from the project in the right and responsibility etc. of EPI in the contract shall get transferred to ESIC or their nominated agency (ies).

18.0 Cement and steel shall be procured by the contractor conforming to grade & make as specified at clause no. 1.4.13 & 1.4.14 of Technical specification (Annexure-IV).

-0-

ANNEXURE – IV


INITIAL LOAD TESTING OF PILE INCLUDING CONSTRUCTION OF TEST PILES FOR PROPOSED ESIC & ESIMB BUILDING AT GB

BLOCK, SECTOR -III, SALT LAKE CITY, KOLKATA


TECHNICAL SPECIFICATIONS

Annexure- IV

1. TECHNICAL SPECIFICATION FOR DRIVING OF PILE AND INITIAL TESTS


1.1 Scope of work:The scope of work involves broadly the followings:

Construction of Bored cast-in-situ piles Earthwork excavation and or filling Initial Testing of pile to determine pile capacity as per IS 2911 ( Part IV)

1.2 Soil Data:A complete copy of the soil investigation report is available for inspection of the intending tenders at the office of the Engineering Projects India Ltd., Kolkata Office. In addition the Tenderers may carry out soil test at their own cost at site for their own satisfaction. However, the cost of such soil test shall be included in the rates/financial bid of the tenderers and no payment shall be paid separately on account of carrying out soil test.The tenderers are required to ensure capacity of pile as mentioned in the soil report / drawing.1.3 Setting out:The position of piles for initial testing to be done as per direction of the engineer-in–charge1.4 PARTICULAR SPECIFICATION1.4.1 Bored Cast – in – situ pilesa) Bored Cast – in – situ RCC piles of diameter and length as specified in the schedule of

quantities are proposed to be installed. The cut off level for piles may be considered at a level of approximately 1.8m below average ground level.

b) Payment shall be made for the length of the pile measured from cut-off level (C.O.L) to the tip of pile only and nothing extra shall be paid for empty boring of the concrete above the C.O.L. and whatever extra is required technically and as per IS 2911 (PartI/Sec 2) shall be included in the rates quoted for relevant items of piling work.

Cont’d…IV/2

-IV/2-

c) Before tendering the contractor shall inspect the site of work and thoroughly acquaint himself with the site condition. The location of piles shall be shown to the contractor immediately on mobilisation at the work site.


d) Any filling, dressing up or excavation required for easy movement of the piling rigs and all precautions necessary for the safety of the works, tools and adjoining structures shall have to be undertaken by the contractor at his own cost.

e) All cost incurred for shifting of rigs, machinery etc. from one location to another shall have to be born by the contractor within the rates quoted by him.

f) The contractor shall be responsible for the accurate setting out of the works.

g) All piles shall be bored Cast – in – situ type and installed by the using DMC techniques. High quality sodium based Bentonite as per IS specification shall be used. Concreting by Tremie Technique, using minimum 150mm I.D. Tremie pipes to construct a sound continuous RCC shaft for each pile shall have to ensure.

h) Boring for all pipes shall be initially done by using a sludge pump / boiler with collar casing of minimum 3.0 mtr deep. Thereafter boring shall be progressed by DMC methods using Bentonite slurry of suitable consistency for stabilizing the hole.

1.4.2 BENTONITEa) The Bentonite used shall be of high quality sodium based montmorillonite as per specification. b) The liquid limit of Bentonite when tested in accordance with IS 2720 (part IV) 1965, shall be more than 350%.

Cont’d…IV/3

-IV/3-

c) The sand contend of the Bentonite power shall not be greater than 7%.


d) The Bentonite slurry should be made by mixing it with fresh water using pump for circulation. The density of the fresh Bentonite solution after 24 hours maturing should be about 1.12 gm/cc.

e) The Marsh Viscosity of fresh slurry when tested by a standard marsh cone should be about 37 seconds.

f) The swelling index as measured by the swelled volume after 12 hrs. in abandon quantity of water shall be at least 2 times its dry volume.

g) The pH value of the Bentonite suspension shall be less than 11.5 but not less 8.5.

h) Fresh Bentonite powder brought at site shall be tested for properties enumerated in IS2911Part I/sec 2 and any stock not meeting this standard shall be taken away, replaced by acceptable stock all as per the direction of Engineer – in – charge.

i) The contaminated slurry shall be suitably processed by appropriate means (Sp. Gr. of the slurry not to exceed 1.12 before re – circulation into the pile bore during progress of boring.)

j) The Bentonite processing unit with settling tanks of required capacities shall be made adequately planned and constructed based on good engineering practice before starting the job. The consistency of the Bentonite slurry used shall be such as to ensure the stability of hole during boring and till completion of concerting. The Bentonite powder and the slurry made shall be tested at regular intervals and records maintained in the field registered.

Cont’d..IV/4

-IV/4-

1.4.3 The pile bore shall be then be flushed and cleaned through the tremie set using fresh bentonite slurry for a period of not less than 10 minutes or till the slurry from the hole has a specific gravity less than 1.20 and/or Marsh cone value less than 45.


1.4.4 After lowering the reinforcement cage a tremie set (I.D not less than 150mm dia) shall be

lowered so as to reach the bottom of the bore – hole.

1.4.5 Concreting shall be commenced immediately on completion of flushing. The tremie hopper shall have a minimum capacity of 0.75m³ and it shall be filled up fully using a stopper. The batch of concrete shall discharged in one – go to ensure a minimum 1.5m embedment of the tip (bottom) of tremie within the concrete. This minimum embedment shall be maintained till end of the concreting operation by correct monitoring of tremie pipe cutting in stages. This complete concreting operation shall be preferably completed within 5/6 hours.

1.4.6 Concreting of grade M35 designed mix as per relevant IS codes and with cement consumption not less than 400 kg/cum and having a slump consistent with method of concreting but not less than 150mm shall have to be used. If higher quantity of Cement than minimum is necessary to achieve the desired strength and workability, the same shall have to be used without any extra claim.

1.4.7 The removal of Bentonite muck and bored soil from the site shall be the responsibility of the contractor at his own cost to the location as specified by the Engineer – in – charge.

1.4.8 All work shall be as per IS 2911 part /Section 2-1987.

1.4.9 On completion of piling in specific areas the top weak concrete of the pile shaft shall be broken down to the specified cut-off level to expose sound concrete shaft. The pile reinforcement shall project above cut off-level.

Cont’d..IV/5

-IV/5-

1.4.10 All plant, machinery, tools and tackles, collar casing labours etc. required for the completion of the work as per the technical specification and good Engineering practice, within the schedule time of completion, shall have to be provided by the contractor at his own cost.


1.4.11 Pile should be installed as accurately as possible as per the drawings. For vertical piles a

deviation of more than 1.5% shall not be permitted. Also a pile should not deviate more than

75mm or D/10, which ever is less for the pile having diameter more than 600mm. In case of piles

deviating beyond this limits any additional piles that have to be taken to makeup the deficiencies

to be provided by the contractor at his own cost.

1.4.12 Initial vertical load test shall be carried out in single pile to ascertain the capacities of piles and their behaviors.

Test shall be carried out as per the requirements of IS 2911 (Part IV) and the test results shall be submitted with all details and graphs. The scheme of pile test shall be submitted by the contractor for approval of the Engineer – in – charge prior to making arrangement for tests on selected piles. This approval however shall not relieve the contractor from the responsibility of the test safety and in a technically sound manner.1.4.13 Specification for Bored Cast – in – situ Concrete Piles a) Codes and standards:IS 456-2000: Code of practice for plain and reinforced concrete.IS 2911 (Part I/ Section 2) 1979: Bored Cast – in – situ Concrete Piles.IS 2911 (Part IV) 1985: Load test on piles. b) Materials: Cement : Cement shall conform to IS 8112 or IS 12269 (Grade 43 or 53) or IS 1489 (part 1) ( PPC) (Ultratech, ACC, Grasim or Lafarge) Steel : Steel shall conform to IS 1786, (TATA or SAIL) Bentonite : Bentonite shall conform to Appendix ‘A’ of IS 2911 (Part I/Section 2) 1979

Cont’d…-IV/6

-IV/6

1.4.14 Concrete:a) Concrete of grade M35 (RMC i.e. ready mix concrete) with 20mm and down coarse aggregate as stipulated in I.S. 456 and I.S. 2911 (Part I-sec. 2) 1979 latest revision, with minimum cement content of 400kg/m3 of concrete and degree of workability will be in very high category, measurement of workability by determination of flow (IS: 9103) may be used,


slump greater than 180mm should not be used for piling. Design of Concrete mix to be done and to be got approved by EPI Ltd.

b) Specified characteristic compressive strength of 150mm cube at 28 days will be 35 N/sqmm.c) Concrete is to be tested as per I.S. code 516-1959 (latest Revision)and shall be RMCContractor should ensure uniform grade and quality of Concrete for the entire project.1.5 Workmanship1.5.1 Control of pile Installation:

The pile shall bored Cast – in – situ RCC Piles capable of being test for bearing capacity after 28 days of casting. Bored Cast – in – situ Piles shall be adopted by suitable choice of installation techniques e.g. using casing and/or drilling mud, manner of concreting i.e. by direct pouring and placing by buckets or by using tremie method and choice of boring tools in order to achieve a satisfactory installation of piles in the site.1.5.2 Construction of Piles:

1.5.2.1 Boring:a) Boring may be done by graving the earth or by reverse or direct mud circulation technique. In general the hole shall be kept cased with a lead in tube to prevent ingress of soil. In soils, which are liable to flow, the bottom of casing shall be kept low enough in advance of the boring tools to prevent the entry of the soil into the casing, thus preventing the formation of cavities and settlements in adjoining grounds.

Cont’d……-IV/7

-IV/7-b) Alternatively, the inflow of ground water and soil shall be controlled by the use of a head of drilling mud e.g. Bentonite suspension.

c) Wash sample/bailer sample of soil shall be collected for inspection during progress of boring mud soil samples of the founding strata shall be carefully collected and stored for inspection.


d) The depth of boring shall be determined by sounding and in case of uncased bore diameter of the bore at different depth shall be determined by pantograph or other suitable means as directed by Engineer – in – charge. After completion of boring the holes shall be cleaned by airlift method of flushing with fresh drilling fluid.

1.5.2.2 Lowering of reinforcement Cage :

a) On satisfactory completion of boring the Reinforcement cage shall be lowered inside the bore holes with sufficient number of cement conc. cover block attached with the lateral links.

b) The Reinforcement cage should go down into the bore hole and in no case, the cage shall be hammered for lowering. During concreting the Reinforcement cage shall be kept hung by suitable arrangement from the top of the bore hole and not allowed to stand on its own weight on the bottom of the bore holes.

1.5.2.3 Concreting: a) In case a hole is bored by use of drilling mud, the specific gravity of the mud suspension near about the bottom of the holes shall, whenever directed, be determined by suitable slurry samples in a first few piles and at suitable intervals of piles and recorded. Consistency of the drilling mud suspension shall be controlled throughout the boring and Concreting operation in order to keep the holes stabilized as well as to avoid concrete getting mixed up with the thicker suspension of the mud.

Cont’d.. IV/8

-IV/8-b) The Concreting operation shall not be taken up when the specific gravity of bottom slurry is more than 1.2. Concreting shall be done by Tremie method in such cases. The slurry shall be maintained at 1.5m above the ground water level. The Concreting of piles shall commence immediately after the completion of boring. Should a bore hole, which is not cased, be left unconcreted for more than two hours, it shall be cleaned thoroughly before placing concrete to the satisfaction of Engineer – in – charge.


c) The bottom of the bore holes shall be cleaned of all accumulated sand, muck and loose materials by controlled air lift flushing with fresh drilling fluid. The tremie pipe shall extend to the bottom of the bore hole at the start and shall be jointed in sections and fitted with the hopper for receiving the concrete pore at the top of the bore hole. The first charge of concrete shall be pored in the hopper, the bottom opening of which temporarily remains closed by a steel plate placed on top of the opening. The hopper shall have adequate capacity to receive concrete sufficient enough to displace the drilling mud within the tremie pipe and from the bottom of the bore hole. After the hopper is filled up the steel plate shall be quickly removed to allow the concrete to rush into the bore hole and fill it up from the bottom by displacing the drilling fluid from the tremie pipe and the bottom of the bore hole. As concreting progresses the tremie pipe shall be removed in sections ensuring every time that the bottom of the tremie pipe remains embedded in side the concrete for at least 1m. The placing of concrete shall be done in one continuous operation and the tremie pipe shall be held concentric with the bore. The level of concrete shall be checked at frequent intervals to maintain a sufficient head of concrete above the discharge end of tremie pipe. It shall be ensured that sufficient number of mixes are pored to expel the first mix of concrete contaminated with Bentonite such that good concrete is obtained up to 15cm above the cut off level. At all stages of Concreting, care shall be taken to prevent voids and segregation of concrete.The top of concrete in a pile shall be brought above the cut- off- level to permit removal of laitance and weak concrete before capping and to ensure Concrete at the cut- off- level for the proper embedment into the pile cap. When Concrete is

Cont’d.. IV/9

-IV/9-

placed by tremie method, Concrete shall be cast to the piling platform level to permit overflow of Concrete for visual inspection or to a minimum of 1 mt. above the cut- off – level. In the circumstances the cut-off- level is below the ground water level the need to maintain a pressure on the unset Concrete equal to or greater than water pressure than should be observed and accordingly the length of extra Concrete above the cut- off- level shall be determined.1.5.2.4 Withdrawal of Casting:


a) Extraction of casing shall be done in such a manner that no necking or shearing of the Concrete in the shaft takes place.Sequence of Piling:Sequence of piling shall be such that there is no damage caused to the concrete recently laid in the adjacent pile. Construction of piles shall be done in accordance with the priority of construction of various building. Sequence of piling shall be decided by the Engineer- in- charge.

1.5.2.5 Finishing of Pile Heads:The top level of concrete in the pile shall be brought up sufficient above the required level or cut - off- level to allow for slumping or withdrawal of casing tube, and also to have a minimum allowance above cut-off-level for removal of all laitance and weak concrete at the cut-off-level. Any defective concrete at the head of the completed pile shall be cut out and made good with new concrete bonded to the old concrete. Manual chipping of the pile heads may be permitted after three days of pile casting. Pneumatic tools for chippings shall not be used before 7 days after pile casting.

1.5.2.5Consumption of Concrete in Piling:After concreting the actual quantity of concrete shall be compared with the average obtained from observations actually made in the case of a few piles initially casted. If the actual quantity is found to be considerably less, special investigation shall be conducted and appropriate measures to be taken.

Cont’d…IV/10

-IV/10-

1.5.2.6 Replacement of Defective Bored Piles:

a) Defective piles shall be removed or left in place without affecting the performance of adjacent piles or capping above an additional pile / more than one piles (as required in considering structural aspect) shall be provided to replace them, as directed by Engineer-in-charge, the cost of replacement and / or provision of additional piles, and additional cost of providing larger size of pile caps and grade / plinth beams as directed shall be borne by the contractor at no extra cost to the employer.


b) In case of defective boring, the defective bore hole shall be filled up with sand consolidation / concrete (filling material to be decided by the Engineer in charge which will be binding to the contractor) and the position of boring for that pile to be shifted as per direction, if required fro structural aspect position of more than one pile may be shifted due to that defective boring, and additional cost of providing larger size of pile caps and grade / plinth beams as directed shall be borne by the contractor at no extra cost to the employer.

1.5.2.7 Deviation for designed location/alignment of piles:Any deviation from the designed location, alignment of any pile shall be noted and adequate measures taken by the contractor.

1.5.2.8 Basic properties of Drilling mud (Bentonite):a) Properties Drilling mud shall be used to keep the sides of borehole stabilized. The drilling mud shall have Thixotrophic properties, i.e. gel forming properties. The drilling mud shall have such properties as to permit formation of filter cake on the inside surface of the bore holes, the thickness of which will depend on the nature of sub-soil deposits. Sodium based Bentonite have ideal properties suitable for use as drilling mud.

Cont’d.. IV/11

-IV/11-

b) Specification: The Bentonite suspension used for piling work shall satisfy the following requirements:

a) The liquid limit of Bentonite when tested in accordance with IS: 2720 (Part- V) shall be more than 300% and less than 450%.

b) The sand contained of the Bentonite powder shall not be greater than 7%.c) Bentonite solution shall made by mixing it with fresh water using pump for re-

circulation. The density of the Bentonite solution shall be about 1.12 maximum.d) The marsh cone viscosity value when tested by a marsh cone shall be about 37 sec.


e) The swelling index as measured by the swelled volume after 12 hrs. in abundant quantity of water shall be at least 2 times its dry volume.

f) The pH value of the Bentonite suspension shall be less than 11.5 but not less than 8.5.

1.5.2.9 Loss of Bentonite : In the event of a sudden loss of Bentonite suspension during boring, the bore hole

shall be backfill without delay and instructions of the Engineer-in-charge shall be obtained.1.5.2.10 Removal of Bored Muck:

All reasonable steps shall be taken to prevent spillage of Bentonite suspension on the

site away from the immediate vicinity of the pile. Discarded Bentonite suspension which has been pumped from the boring shall be removed from the site by the contractor at no extra cost to the employer.

1.5.2.11 Procedure for Initial vertical load tests on piles:a) The pile head shall be chipped off carefully till sound concrete is met. The projecting reinforcement shall be cut off and the top surface finished smooth and leveled with plaster of paris when required. AMS bearing plate shall be placed on the head of the pile for the jack to rest.

Cont’d… IV/12

-IV/12-

b) The test shall be carried out by applying a series of downward incremental loads on the test pile.

c) The loading shall be done by reaction from the kentledge of adequate capacity for the full test load. Test pit shall be excavated by open excavation through all types of soils to required depth. The base of the pit shall be minimum 3m X 3m size with adequate side slope and provision for shoring and dewatering etc. The excavated materials shall be dumped sufficiently away from the edge of the excavation so as not to endanger the


stability of pit. After completion of the test, the pit shall be back filled as directed by Engineer – in charge.

d) The hydraulic jack for transferring the load to the pile shall be capacity 25% in excess of the final test load proposed to be applied and shall be provided with calibrated pressure gauge. The contractor shall furnish to the Engineer – in – charge necessary tests certifies for each dial gauge from approved authority before putting into operation.Before any load test is performed, the contractor shall obtain the approval of the set up and the load frame from the Engineer – in – charge. Care shall be taken to ensure that the centre of gravity off Kentiledge is on the axis of pile and load applied by the jack is co – axial with the pile.

e) The M.S plate of 5mm thick shall be set on the pile head such that its surface is perfectly horizontal jack shall be inserted between the M.S. plate and the kentledge frame. The dial gauge shall at equal distance around pile and shall be fixed to two numbers of datum bars whose ends shall rest on immovable supports. The supports for the datum bars with reference to which the settlement of the pile will be measured shall be at least 5D away clear from the piles, where D is the dia of pile subject to a minimum of 1.5m.The test loads shall be applied in increments of about 20% of the assumed safe loads.

Contd..IV/13

-IV/13-

f) Each stage of loading shall be maintained till the rate of displacement of the pile top is either 0.1mm in first 30 mins or 0.2mm in first one hour or till 2 h whichever occur first. The test load shall be maintained for 24 hrs.

g) For each increment, application of load shall be smooth as far as possible. Time and settlement observations shall be made at the commencement and completion of each increment. Settlement observations shall be continued when each increment load is kept constant at about 15 mins intervals. The load on the pile may be removed in one stage by releasing the jack steadily after completion of the test and rebound observations made for 2 hrs.


h) The safe load on single pile may be removed in one stage by releasing the jack steadily after completion of the test and rebound observations made for 2 hrs.

1.6 The safe load on single pile shall be calculated as below.

a) Two thirds of the final load at which the total settlement attains a value of 12mm. Unless it is specified that a total settlement different from 12mm is permissible in a given case on the basis of nature and type of structure. In the later case, the safe load shall be corresponding to actual total settlement permissible.b) 50 percent of the final load at which the total displacement equal 10 percent of pile diameter in case of uniform diameter pile. Lateral load test:This to be done as per IS 2911 ( Part 4) 1985.The safe lateral load of pile will be least of the following:a) Fifty percent of the final load at which the total displacement increases to 12mm.b) Final load at which total displacement corresponds to 5mm; andc) Load corresponds to any other specified displacement by the Engineer-in Charge.

All the displacement measured at cut off level.Cont’d… IV/14

-IV/14-

1.8 Recording of dataComplete records of boring and Concreting process for each file shall be maintained by the contractor and submitted daily in triplicate to the Engineer or his representative at site for their record, one copy of which shall be counter signed by the Engineer – in – charge of his representative and return to the contractor. The following recordings shall be maintained for each pile:a) Details of pilesi) Pile number and location ii) Existing ground level, cut-off-level and level of top of the castingiii) Nominal shaft and inside diameter of casing iv) Data and time of setting up of rig at the pile location.


v) Data and time of start of boring.vi) Length of casing driven and depths bored vs time.vii) Description and thickness of various strata bored.viii) Details of any obstructions encountered (depth from existing ground level, thickness and time taken to penetrate through the same)ix) Chiseling depth and time.x) Final depth of boring (founding level).xi) Standard penetration test at the bottom of the bore hole, if any.xii) Date and time of completion of boring.xiii) Data and time of start and completion of flashing of the bore hole with fresh Bentonite fluid before Concreting.xvi) Time of lowering Reinforcement cage and tremie pipes with total length thereof.xv) Date and time of start of concretingxvi) Nos. of mixes poured. Level of concrete inside the bore hole and tremie pipes at various stages of concreting.xvii) Concrete grade, mix proportion, water cement ratio and slump test results.xviii) Empty boring length and concrete length below cut-off-level.xix) Results of tests on Bentonite slurry used.

Cont’d.. IV/15-IV/15-

b) Details of Instruments used

I) Make and specification of jack, pressure gauge and dial gauge.II) Capacity of jack.III) Calibration of pressure and dial gauge.IV) Design load of piles, description of location and identification marks for testing.

c) Test recordings: The readings for settlement and rebound shall be entered in the standard form.

-0-


Annexure - V

Form of Price Bid

I /We………………………….. …. agree to carry out the items of work as described under Bill ( Name of Tenderer )of Quantities for the Initial Load Testing Of Pile Including Construction Of Test Piles For Proposed ESIC & ESIMB Building At GB Block, Sector -III, Salt Lake City, Kolkata and scope of work in line with technical specifications and scope of work and terms & conditions as attached with/forming part of the tender documents at the rates and amounts as mentioned below:

Sl.No.

Item Estimated cost (In Rs.)

Tenderers Rate% Below/Above

Amount in Rs after adding /subtracting percentage above / below

(In figures) (In words)


1 Pile works and initial testing (DSR Item)

8,52,836.30

2. Pipe works and initial testing (Non DSR item)

1,30,000.00

TENDERER’S FINANCIAL OFFER : Rs._____________________________________________

In Figures

Rs._____________________________________________ In Words

(Signature of the Tenderer with Seal)

ANNEXURE – VI

CONSTRUCTION OF INITIAL LOAD TESTING OF PILE INCLUDING CONSTRUCTION OF TEST PILES FOR PROPOSED ESIC & ESIMB BUILDING AT GB BLOCK, SECTOR -III, SALT

LAKE CITY, KOLKATA



BILL OF QUANTITIES

