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Profile BookCompany Overview
Since 1985 KASHEM N Company Ltd. proudly worked in the development of construction sector with highest quality construction.
WelcomeWords From Our Founder
Kashem N Company Ltd. has establish the tradition of 'Best management practices ' in con-
struction industry through integrity, trustworthiness and high quality work. In its business
practices, Kashem N Company Ltd. has consistently demonstrated two key features; innova-
tion and sustainability. The Strength of Kashem N Company Ltd. lies in its long standing
experience, higher level of professionalism, superior technical knowledge and excellent
communication and networking skills. We value our employees and customers.
With the mission our success is driven by more than building some of the most advanced
facilities for our corporate, institutional and government clients. More and more our clients
are Turing to us for our distinctive ability to implement innovative project management tech-
niques and to serve as a reliable provider of knowledge driven solution for their complex
construction project.
At the end, I would like to request you to continue having faith in Kashem N Company Ltd.
and we promise to be with you for all your construction needs.
Haji Md. Abul Kashem
Founder
A Quick LookIndex
Overview
Mission
Vision
QEHS Policy
Quality
Environmental, Health and Safety
Strategic Planning
Business Commitments
Our Expert Team
Our Valued Clients
Work
Experience
Completed Projects
Foundation
Pile location Setup
Reinforcement Cage Installation
Concreting of Pile
Test Euipment and Apparatus
Test Procedure
Installation of temporary guide casting
Foundation
Test Procedure
Test Pile Requirements
New step begins here
Introduction &Welcome
M/S KASHEM & Co. named as KASHEM N COM-PANY LIMITED started its journey from the day of commencement of the company in 1985 by the hand of its owner Haji Md.Abul Kashem along with a group of talented, creative and trained personnel with a vision and mission to serve in the advancement and development of construction sector and to provide the highest quality construction on schedule and within budget. The mastermind of KASHEM N COMPA-NY LIMITED ltd is the owner HAJI ABUL KASHEM himself.. On 28th Nov 2017 M/S Kasham & co. incorporated as a limited compa-ny and the new reformed company started as Kashem N Company Limited. The Chairman & Managing Director MOHAMMED BILLAL HOS-SAIN & KHAN MOHAMMAD SELIM Construction is a costly, complex and challenging process which requires expert and experienced han-dling. KASHEM N COMPANY LIMITED provides the required expertise to face these challenges head on. Our company’s objective is to offer our clients with the utmost quality experience, competitive pricing, professionalism, commit-
ment to our projects and finally a finished proj-ect without any delay. We promise to do so by using our latest technology and techniques through innovative planning and strategies.Keeping pace with the rapid changes and advancement in construction sector, we have taken up projects of various diversity such as bridges, buildings, universities, flyovers, power stations, industries and hospitals in our 30 years of experience. These count as a total of more than 500 projects including small and big ones all over Bangladesh. It also includes the com-pletion of 3 private universities, 7 power stations and one flyover. We deal with numerous types of pile drilling for example – situ piles, precast piles and rotary piles.
We believe in putting our customers first and that is what our team strives to achieve. We can proudly say that we have built a very strong and well managed team by going through an intense selection process who are confident to achieve our goals and objectives with full accu-racy.
VisionTo be one of the significant and
renowned construction company in
Bangladesh by fulfilling customers
expectation of services.
MissionOur success is driven by more
than building some of the most
advanced facilities for the cor-
porate, Industrial and govern-
ment clients. More and more of
our clients are turning to us for
our distinctive ability to imple-
ment innovative project man-
agement techniques and to
serve as a reliable providers of
knowledge driven solutions for
their complex construction
projects.
QEHS Policy The management and staffs of Kashem N Company
Ltd. are committed to comply and continually improve
the effectiveness of our established integrated man-
agement system in all aspect of our operation.
QualityWe strive/determine to achieve
and enhance our customer sat-
isfaction in accordance with the
quality of Product and timely
completion through consistent
services and competent
human resources.
We are well aware of environment, safety and health issues that have a significant
impact on our employees and interested parties. We are highly determined to our
commitment regarding_ Full occupational safety. Health and environmentally friend-
ly work practice with full compliance to legal issues. Achieve our objectives and
targets through preserving natural resources, prevention of pollution, injury and
health issues. We are also committed to effective communication within company
staffs and interested parties. Promote continual improvement of E HS through con-
stant training and sustainable management planning.
Environmental, Health and Safety
Strategic Planning
Business Commitments
No good deal lasts forever. Because your market customers and even products and
services change, you need a strategic plan that will help your company adapt and grow.
Strategic planning helps senior executives envision and develop the company 's future.
Prepare for the planning process;
Build an effective planning to am;
Identify and shape your corporate culture;
Conduct a situational of both your internal and external environments;
Implement team work to achieve long -lasting results.
Saving commitments on words & time is the first things in the busi-ness;
successful deals is finalized by goals, but setting goals is nothing if you do not stick with them;
Commitment to value is the core, it forces to hardest way of working;
Commitment to action is also important every single day you need to commit an action towards your goals.
Making a team is much more strategic way to success. Here’s the power of we is enforces to result.
Our OrganogramKashem N Company Ltd. have their own resident facility for their employee, so
that they couldn't face any trouble to collect them.
Our Machinery Collections
Hydraulic Rotary Drilling Machine
Static Hydraulic Pile Driver
Diesel hammer with 70 fit tower
Mechanical Rotary
Percussion Method Cast-In-Situ
Crane (20 – 50 ton)
Our Machinery Collections
Excavator (0.3 to 0.9)
Pay Loader
Drum Truck
Concrete Pump
Bull Dozer
Generator(65kv – 500kv)
Our Valued Clients
Mir Akhter Hossain Ltd. National Development
Engineers Ltd.
Hamid Construction Ltd. Concord Engineering
and Construction Ltd.
Rangs Properties Ltd. Shanta Holdings Ltd. Eastern Housing Ltd. Navana Real State Ltd.
Meghna Group of Industries Ltd. Pubali Construction Ltd. Square Pharmaceutica Is Ltd. Abdul Monem Ltd.
ABC Limited
Monico Ltd.
SINNAM Group
Ideal Builder's Ltd.
Bangladesh Development Corporation.
Mir Holdings Ltd.
Mir Real State Ltd.
Advance Development Technology.
Engineering Construction Battalion,
Bangladesh Army.
Hubei Electric Power Survey
& Design Institute.
China Energy Power China
Completed Projects
T hes e are the projects we have completed s o far. All of them were s ucces s ful
and we are s till being admired for our qua litative work. It is rea lly hard to s howcas e 400+ completed projects at once that is why we categorized it and
gave a glance of our compl eted tas ks .
1. B r idge s : More than 30 bridge pilings are completed by Kashem N Company Ltd.
T hes e were (60 to 200) pile with 1000mm to 1200mm Dias range projects . W e have collaborated with Mir Akhter Hos s ain L imited, Nationa l Development
E ngineering L imited, Nava na L imited, AB C L imited and s ome others
companies regarding thes e projects .
2. B uilding s : More than 300 S ma ll and 20 S kys crapers projects were done by
Kashem N Company Ltd. T hose projects included (300 to 1000) pile with 400mm to
700mm Dias range, and we colla borated with Mir Akhter Hos s ain L imited,
Navana L imited, E as tern Hous ing L imited, AB C L imited, Nationa l
Development L imited, Idea l L imited, R angs P roperties L imited And S hanta
Holdings L imited.
3. Univers ities : T hree P rivate univers ity piling projects were done by
Kashem N Company Ltd. and we associated with Mir Akhter Hossain Limited, NDE
and AB C Ltd for these projects.
4. P ower S tation: T here was at least 7 power station projects done by
Kashem N Company Ltd. with Mir Akhter Hossain Limited, NDE , ABC limited and
S innam group of companies.
5. F lyover : W e have completed a flyover piling project with Mir Akhter
Hossain Limited .
6. Medical ins titutes /Hos pitals : W e have completed five projects of Medical institutes/Hospitals piling with Mir Akhter Hossain Ltd., AB C Ltd., Navana G roup .
7. F actory/G arments: T here were at least 10 to 15 large factories/garments basement piling projects done by Kashem N Company Ltd. s ituated in Dhaka and C hittagong .
PHP Glass Factory
Project: Radission Client: Mir Aktar Hossain Ltd.
Total project value: 105 Million BDT Duration: Feb 2005 to Jul 2008
Exposure of work: 760 nos of pile, 24 meter length Q600mm & civil work
Project: PHP Glass Factory Client: ABC Limited
Total project value: 150 Million BDT Duration: Feb 1998 to Nov 2001
Exposure of work: 1200 nos of pile, 25 meter length Q600mm & civil work
Project: North South University Client: ABC Limited
Total project value: 95 Million BDT Duration: Mar 2002 to Sep 2005
Exposure of work: 780 nos of pile, 32 meter length Q600mm & civil work
Project: East West university Client: Navana Group
Total project value: 109 Million BDT Duration: Dec 2007 to May 2010
Exposure of work: 755 nos of pile, 28 meter length Q500m & Q600mm & civil work
Project: American International School Dhaka Client: Mir Akhter Hossain Ltd.
Total project value: 55 Million BDT Duration: Jan 1999 to Mar 1999
Exposure of work: 426 nos of pile, 30 meter length Q600mm & civil work
Project: Independent University Bangladesh Client: Mir Akhter Hossain Ltd.
Total project value: 75 Million BDT Duration: Feb 2007 to Jul 2009
Exposure of work: 505 nos of pile, 30 meter length Q500mm & civil work
Project: Nagar Bhaban Client: Navana Group
Total project value: 39 Million BDT Duration: Mar 1988 to Sep 1988
Exposure of work: 650 nos of pile, 21 meter length Q600mm & civil work
Project: Haji Camp Client: Navana Group
Total project value: 65 Million BDT Duration: May 1995 to Nov 1997
Exposure of work: 625 nos of pile, 23 meter length Q500mm & civil work
Project: Appolo Hospital Client: STS Group
Total project value: 49 Million BDT Duration: Dec 2001 to May 2003
Exposure of work: 575 nos of pile, 32 meter length Q600mm & civil work
Project: Japan Garden City Ltd. Client: Japan Garden City Ltd.
Total project value: 98 Million BDT Duration: Nov 2007 Aug 2011
Exposure of work: 1600 nos of pile, 24 meter length Q600mm & civil work
Project: Mirpur Airport Road Flyover Client: Mir Akhter Hossain Ltd.
Total project value: 30 Million BDT Duration: Jan 2010 to June 2010
Exposure of work: 120nos of pile, 30 meter length Q1200mm & civil work
Project: Bosila Bridge Client: Mir Akhter Hossain Ltd.
Total project value: 23 Million BDT Duration: Jan 2001 to May 2001
Exposure of work: 200nos of pile, 35 meter length Q1000mm.
Project: 150 MW Power Plant, Konabari, Kodda Client: SINNAM Group
Total project value: 50 Million BDT Duration: Feb 2013 to May 2013
Exposure of work: 550nos of pile, 25 meter length Q750mm, Q600mm & civil work
Project: 125 MW Power Plant, Manikgonj Client: Sumitomo Corporation
Total project value: 45 Million BDT Duration: Apr 1996 to Sep 1996
Exposure of work: 625nos of pile, 30 meter length Q500mm, Q600mm & civil work.
Project: + 110 HFO Gazipur Kodda Client: Hubei Electric Power Servey & Design Institute.
Total project value: 125 Million BDT Duration: Jan 2018 to Aug 2018
Exposure of work: 1050 NOS of pile Q600mm & Q500mm
Let’s Dig Our Exclusive Facts
Foundation & Pile locationWe specialize in foundation engineering, design and
developing the latest techniques in boring and
driven piling systems. The company has emerged as
one of the best in the business and continually
upgrading its services to meet the increasing
demands of the clients.
• Pile location setup
• Installation of temporary guide casing
• Reinforcement cage installation/sonic tubes
• Concreting of Pile
• Removing of temporary guide casing
• Cutting/breaking pile head
Other operations except drilling will be carried out
by using service cranes.
Prior to the rig setup at the pile location existing utili-
ties, obstacles or other underground services (tele-
phone lines, electric cables, drainage system, etc.)
are to be removed or relocated. The piling rig will
drill from the working platform level. The working
platform and access to pile location shall be made
with suitable hardcore material for the movement of
the equipment and ready mixed concrete trucks.
Reinforcement Cage Installation
After the completion of the drilling, the borehole depth will be checked
and verified versus the depth given to ensure the correct positioning of
the cage concerning cut off level. The reinforcement for the pile shall be
according to the requirements of the specification and the design of the
pile. The reinforcement shall conform to the mill certificate approved by
the consultant. The reinforcement cages will be fabricated up to the
designed length. The cage should be free from dirt. Durable spacers
shall be used at intervals to keep the reinforcement cage in position.
The pre-fabricated reinforcement cage will be lifted and placed in the
pile borehole using the service crane. The cage will then be lowered to
keep the top level at the designed level. Heavy steel cages will be lifted
with the help of a crane. The spacers shall be of PVC material or cement
concrete and as per approved sample for a clear concrete cover 75mm
to the reinforcement. The first layer of spacers will be placed at 20 cm
below cut off level. The spacing between spacers should be within 2 to
3 meters and should terminate only 30 cm above reinforcement toe (any
addition/ variation by the consultant will be considered).
The concrete is delivered employing truck mixers. The concrete
will be received on-site and delivery ticket will be checked for
correctness following the approved mix design. The concrete will
be checked for slump and temperature. The cube will be taken as
per specification. The concrete will access the site only after con-
crete quality has been found in compliance with the specifica-
tions. The concrete shall be poured by using tremie tube method
and placed without interruption to prevent hardening of the pre-
vious batch. The tremie pipe size will not be less than 100 mm and
is made up of sections with sufficient length to reach the toe of
the pile. The tremie pile will be inserted at the center of the pile to
reach up to the toe. The concrete shall be delivered directly from
the concrete truck to the tremie pipe hopper. The tremie pipe is
connected with the tremie pipe hopper which is attached to a
crane. The concrete is discharged into the pile borehole through
the tremie pipe hopper. The tremie pipe is lifted by using the
crane making sure that the bottom of the tremie is at least 2 m
inside the concrete. A sufficient quantity of concrete will be
poured until the concrete level in the pile reach the required level
above the cut off level to ensure good quality and contamina-
tion-free concrete at the pile cut off level. The concrete above cut
off level will be chipped by the following contractor.
Various methods are used to confirm the level of concrete in
Borehole. For confirming the level of the concrete inside the
borehole, we use bamboo. A bamboo is lowered inside temporary
casing up to concrete level and check to confirm the level of the
concrete. The polymer slurry displaced by the concrete will be
pumped back to the desander.
Concreting of Pile
After concreting, the temporary guide casing will be withdrawn by the crane/piling rig.
A sufficient head of concrete will be maintained to prevent the reduction in diameter of
pile shaft by earth pressure, polymer slurry or soil and to prevent extraneous material
from mixing with fresh concrete. The quantity of poured concrete volume will be mea-
sured and it will be compared with the theoretical volume. Spoil from the drilling of
boreholes shall be removed from the site to designated disposal areas. When a pile has
been driven to the required set of depth and afterload test has been carried out, the
head of the pile shall be cut off 30 cm above the cut off level. The length of the reinforc-
ing bars projecting above this level shall be as shown or specified in the Drawings.
The Following Main Equipment and apparatus shall be used to perform the axial
compression test (as Sample): Main Test Beam (I), Cross Beams (I), Hydraulic
Jack, Dial Gauges, Pressure Gauges, and Steel Test Plate.
Calibration certificate of the dial gauges and hydraulic jack shall be submitted
to the consultant 3 days before commencement the test.
METHOD OF COMPRESSION TEST The principle system for axial
compression load test is to apply a vertical load to the test pile
using hydraulic jacks acting against a platform carrying the Kent
ledge.
Concrete blocks shall be placed at 2 sides of the test pile. Main
test beam and cross beams shall be placed across the concrete
blocks.
Main test beam is a steel beam section with specified dimen-
sions. They shall be centered over the test plate.
Test Equipment And Apparatus
Test Procedure
Load Test
C O N C R E T EB LO C K S
C O N C R E T EB LO C K SREFERENCE
BEAMREFERENCE
BEAM
HYDRULIC JACK
SECONDARY H-BEAM
BLOCKS
Static load tests on foundation piles are generally carried out in order to determine
load-displacement characteristics.
The test encompasses the direct measurement of pile head displacement in the
response to a physically applied test load. It is the most fundamental form of pile load
test and is considered as the benchmark of pile performance.
A load test is performed by applying pressure to a specific pile in predetermined direc-
tions; either by compression (push), tension (pull), or laterally. The load is generally
applied via a hydraulic jack to make sure the pressure is equal to the final load require-
ment. A reaction frame is then applied against the hydraulic jack. Once activated, any
movement of the pile or the test apparatus is monitored and logged, and the results are
used to determine the capacity of the pile being tested.
( S t a t i c l o a d t e s t s )
Dynamic load testing (or dynamic loading) is a method to assess a pile's bear-
ing capacity by applying a dynamic load to the pile head (a falling mass) while record-
ing acceleration and strain on the pile head. Dynamic load testing is a high strain
dynamic test which can be applied after pile installation for concrete piles. For steel or
timber piles, dynamic load testing can be done during installation or after installation.
The procedure is standardized by ASTM D4945-00 Standard Test Method for High Strain
Dynamic Testing of Piles. It may be performed on all piles, regardless of their installa-
tion method. In addition to bearing capacity, Dynamic Load Testing gives information on
resistance distribution (shaft resistance and end bearing) and evaluates the shape and
integrity of the foundation element.
• The Static Loading Test (SLT) is the most defini-
tive method of determining load capacity of a pile.
• Testing a pile to failure provides valuable infor-
mation to the design engineer for recommenda-
tion prior to foundation design.
• The test permits the selection of both the
optimum pile foundation and the design load.
(Dynamic Low Strain Load Test)(Dynamic High Strain
Load Test)
( S t a t i c A x i a l U p l i f t T e s t )
Static Axial Uplift Test, This test method covers procedures for testing vertical and
batter piles either individually or in groups to determine the load‐deflection relation-
ship when subjected to lateral loading. It is applicable to all deep foundation units
regardless of their size or method
The actual lateral load capacity of the pile‐soil system can best be determined by later-
al testing. Such testing measures the response of the pile‐soil system to lateral loads
and may provide data for research and development, engineering design, quality con-
trol, and acceptance or rejection under specifications. Under the iterative elastic
method of analysis that considers the nonlinear response of the soil, lateral testing
combined with proper instrumentation can be used to determine soil properties nec-
essary for the structural design of the pile to resist the lateral load to be applied
(Lateral Load Test)
Lateral Load Test on Piles is per-
formed on a completed single
cast-in-situ pile in order to evaluate its
performance relative to the lateral
load / displacement criteria for the
design of the working piles.
Installation of temporary guide casting
A temporary guide casing of an internal diameter slightly more than the diame-
ter of the pile will be installed. The temporary casing shall be installed into the
ground with the help of piling rig or with a Vibro hammer. The center of the
temporary guide casing is the previously installed steel pin. The casing shall be
uniform in cross-section throughout the length and free from distortion.
Three reference steel pins will be temporary installed equidistant to the sur-
veyed center of pile point. The distance to the steel casing is measured from
the reference pins and adjustments are made so that the reference pins are
(Equidistant to the steel casing. The position of the casing center shall be
reconfirmed before starting drilling and after completion of drilling.
The rotary rigs are utilized in this process. The hole will be drilled utilizing a bucket equal to the
diameter of the pile form the working platform using a temporary casing. After fixing the guide
casing the borehole will be drilled down to its final level. The buckets grab. the soil inside the
hole deepens the bore. The bucket when filled up with soil is lifted from the hole and spoil is
dumped outside. This process continues until the final stratum is reached. The verticality of the
drilled borehole shall be ensured to its full depth. The drilled borehole will be filled with poly-
mer slurry and shall keep a minimum of 1.50 m above the groundwater level to have enough
hydrostatic pressure in the borehole to avoid any collapse. The slurry level will be maintained
at the working platform at all times. The verticality of the borehole will be checked during drill-
ing appropriate intervals. A handheld spirit of 1.0-meter length shall be used to check the verti-
cality of the mast and thereby that of the Kelly bar and borehole in two opposite directions at
frequent intervals. To keep the quality of polymer during the drilling within the allowable limits
executed during the installation of the pile. The polymer quality will from the polymer supplied
to the borehole. If the properties specified limits fresh polymer shall be added into the system.
The polymer slurry and the soil that is carried out by the displaced polymer from boring or con-
creting operations is sent to a settling tank before being passed through the descending plant
to removed any sand and silt particles that have not settled in the tank. After being cleaned in
the plant, the polymer will be pumped to the polymer tank for further use.
Foundation
The polymer solution shall rest in the tank for at
least 6 hours to allow proper hydration. The
following tests shall be done on the polymer
suspension supplied "to pile borehole to obtain
the present properties with these specification
limits:
Density: As same as the water.
Viscosity: greater than 40 seconds (Marsh cone
method)
pH value: 7.5 to 9.5 ( pH indicator paper or electri-
cal ph meter)
To achieve workable concentration, 1 kg to 2.5kg
of the polymer will be added to approximately
1000 liters of water. Mixing will take place in a
mixing plant designed for this purpose. The sche-
matic layout of the polymer mixing arrangement
is attached.
The polymer slurry shall be checked for specifica-
tion compliance at suitable intervals as agreed
with the Engineer. The test shall be carried out
until a consistent working pattern has established.
When the results show consistent behavior, the
test for ph value may be discontinued and test to
determined density and viscosity shall be carried
out as agreed with the Engineer, In the event of a
change in the established working pattern, tests
for PH value shall be reintroduced for a period if
required, The density of the mixed polymer
suspension shall be measured daily as a check on
the quality of the suspension is formed
Kashem N Company Ltd. Construction Company (BD) Ltd. quality management
system and quality assurance procedures as follows:
Kashem N Company Ltd. Construction Company (BD) Ltd. implements an integrated manage-
ment system covering quality, health, and safety, environmental and internal business needs.
Kashem N Company Ltd.Construction Company (BD) Ltd. is fully committed to the implemen-
tation of this policy which is vital to our continuing success, our reputation and the professional
satisfaction of our staff. All staff is required to implement the Quality, Safety, and Environmental
policy to achieve best practice within Kashem N Company Ltd. Construction Company (BD) Ltd.
and in the wider community.
Typically, the Quality Plan will include:
•Project Document Data: a schedule indicating project titles, code numbers, drawing pre-fixes,
file references, lists of files (including their locations), other data covering appropriate records
of the project and their retention periods.
•Scope of Work: this would generally follow the Terms of Reference as elaborated upon during
negotiations before awarding of the commission.
Project Schedule: an activity timescale incorporating the Client's implementation schedule
and the maintenance period.
•Project Organisation: the Organisation for the Project (internally and externally) will be
defined including activity assignments, responsibilities, levels of authority and lines of commu-
nication.
•Procedures: core procedures will be established to cover each major element of the scope of
work.
Quality Plan
(a) site conditions
(b) soil information
(c) material requirements
(d) pile design
(e) pile production
(f) pile point/ location
(g) pile load test
(h) appointing BUET (Bangladesh
University of Engineering Technology)
for evaluation of pile load test
result and other laboratory
tests
(i) instructing variations and
seeking approval from Clients
(j) award of extensions of time
(k) implementation of construc-
tio
(I) seeking prior approval from
Clients for (machinery, materi-
als, and quality
(m) preparing daily progress
reports
(n) maintenance inspections
(o) coordinating 'as-built' draw-
ings with (Clients and monitor-
ing the progress of the Works,
etc.
• Our business is concerned with the services in connection with the construction, operation,
and maintenance of the built environment and the protection, enhancement, and maintenance
of the natural environment. Our quality policy is implemented through integrated procedures
that specifically target these services.
• We have established and maintained an economic and effective framework for the manage-
ment of processes to ensure that the services provided by Kashem N Company Ltd. Construc-
tion Company (BD) Ltd. remains transparent and meets the requirements of clients of interna-
tional standards, legislation, and management.
• Good quality control is required to ensure high standards of workmanship and a commitment
to delivering a project that is safe for users and has an appropriate maintenance liability. A
well-developed quality management plan also benefits the Client through the integration of
quality with safety and environmental management. This ultimately offers the client a better
value.
• We take an integrated approach to Quality Assurance and combines quality, safety, and envi-
ronmental elements into a single system. We take into account the fact that each commission
is unique and so requires an individually planned approach to project management.
• As work progresses the plan will be reviewed and revised as appropriate to ensure that it
meets the project demands. This process relies on good communication and the free flow of
information between all parties.
• Lower the probes from the top, effectively measuring the access tube lengths. Pull the probes
simultaneously, taking CSL measurements at intervals of 50mm or less from the bottom to the
top of the drilled shaft.
• As the sensors are being lowered, the C HA records, at regular depth interval, the time that the
signal takes to travel from the transmitter to the receiver (arrival Time), as well as the signal am-
plitude/energy. These two quantities are indicative for concrete quality the pair of tubes at a
particular depth as shown later.
• Defects indicated by late arrival times and significantly lower amplitude/energy signals shall
be immediately reported to the Engineer. Additional tests such as the offset elevation CSL test-
ing may be required by the Engineer to further evaluate the extent of such defects.
• The entire shaft is scanned in this fashion. The test is then repeated for each pair of tubes,
allowing for the investigation of defects both along the length and by quadrant.
• The information related to arrival time and to signal energy is shown on the CHA screen in
real-time mode during the logging to allow problem areas to be located immediately and
checked (if required).
• Optional after all the CSL testing has been completed, and after acceptance of drilled shaft by
the Engineer, we shall remove the water in the tubes, place grout tubes extending to the
bottom of the access tube, and fill all-access tubes in the drilled shafts with grout.
Test Procedure• CSL testing can be performed any time after
concrete installation although 2 days is usual-
ly the minimum acceptable wait. Because the
concrete strength and quality generally
increases as the concrete cures, longer wait
times are usually desirable, particularly if
minimum pulse wave speeds are specified or
to reduce result variability between drilled
shafts. However, if PVC tubes are used, long
wait times increase the tube de-bonding
which is detrimental to the tests.
• Prior to running the sonic logs, the caps of
the tubes shall be removed. Don not apply
excessive torque, hammering or other stress-
es which could break the bond between the
tube and concrete when removing caps from
the tubes.
• The transmitter and the receiver shall be fixed on
a PVC cable in length of 60 meters.
• The CSL testing shall performed with the trans-
mitter and receiver probes in the same horizontal
plane in parallel tubes unless test results indicate
potential defect, in which case the questionable
zone may be further evaluated with angled tests.
• Using the labeling established for the tubes,
perform CSL testing between all adjacent perime-
ter access tube pairs and across at least two
major diagonals with the drilled shaft.
Test Pile Requirements
• Access tubes made of steel are to be placed in the drilled shafts before concrete placement.
The actual number of tubes shall be one duct for every 0.25 to 0.35 m of the pile diameter
attached at a constant spacing to the reinforcement cage of the pile. Such tubes shall be
placed around the perimeter of the shaft and shall be tied (or welded) to the inside (or outside)
of the cage of the shaft before it is installed into the piles. These tubes usually are 38 to 50 mm
inside diameter and are round tubes that have a regular internal diameter free of defects and
obstructions, including any tube joints, to permit the free, unobstructed passage of the; probes.
These tubes shall be watertight and free from corrosion with clean internal and external faces
to ensure a good bond between the concrete and the tubes. Tubes may be extended with me-
chanical coupling. Such tubes shall be installed by us in such a way that the CS L probes will
pass the entire length of the tube without binding.
• During installation, access tubes shall befit with a watertight shoe on the bottom and a remov-
able cap on the top.
• These tubes shall be extended from the base of the pile to the surface and should be installed
uniformly and equidistantly around the circumference such that each tube is spaced in parallel
for the full length and at the maximum distance possible from each adjacent tube. Tubes
should be spaced as far as possible from the main axial reinforcing steel. The tubes should be
extended to within 150 mm of the drilled shaft bottom, and at least 1 meter above drilled shaft
tops, and at least 0.6 meters, but not more than that 1 .5 meters above the ground surface.
• Tubes should not be damaged during the installation of the reinforcement cage. After placement of the reinforcement cage, fill the access tubes with clean fresh water as soon as possible but within at the latest one hour of concrete placement. The tubes should preferably be filled with water before concrete placement but MUST be filled with water within at most 4 hours after placing concrete to prevent de-bonding of the access tubes due to differential temperatures. • All the access tubes shall be clearly labeled for identification by the CS L testing agency • Cap the tube tops to prevent debris from entering the access tubes.
The signal contains information about
changes in impedance. Impedance changes
can be caused by variations in cross-sec-
tions, holes, soil inclusion, cracks, and varia-
tion in the stiffness of the surrounding soil.
The signal is passed to the input of the instru-
ment, where it is amplified, converted to digi-
tal form, and processed in a digital computer.
For the operator's convenience, all functions
automatically adapt to the properties of the
signal. A velocity-time record is presented on
the screen; it can be stored on the built-in
hard disk and then plotted.
For Sonic Integrity Testing to be effective, the
pile head must be clean, accessible, sound
and free from standing water, and free from
the steel reinforcement of the pile caps, so
that a small accelerometer can be pressed
against it. Cast-in-situ piles should be at
least 5 days old. It is highly recommended
that integrity testing is performed for all
piles.
The cross-hole sonic test integrity testing is
one of the most advanced and economical
tools for testing the integrity of drilled shafts.
Currently, there is no better method for
non-destructively identifying and defect in
the drilled shafts. The test determines the
quality of concrete between pairs of tubes
pre-installed in bored pile cast-in-situ con-
crete piles, or other types of concrete foun-
dation using the Cross-Hole Analyzer (CHA).
The CHA measures the time it takes for an
ultrasonic pulse to travel from a signal
source in one access tube to a receiver in
another access tube. In uniform, good quality
concrete, the travel time between equidis-
tant tubes will be relatively constant. Longer
travel times indicate the presence of irregu-
larities such as poor quality concrete, voids,
honeycombs, and soil intrusions. The tech-
nique to be adopted shall be following ASTM
D 6760 standard specification.
Kent ledge load calculation Steel plate that shall be put on the smooth surface of the test pile
shall be of minimum 20 mm thick, to prevent it from bending under the loads involved.
Hydraulic jack sufficient to apply the test load shall be placed between the main test beam and
steel test plate, which is fixed on the test pile.
Four dial gauges sensible to 0.01 mm shall have amounted on two references beams.
The load shall be applied to employ a hydraulic power pack unit connected to the hydraulic
jacks using sealed hoses. Pressure values corresponding to the scheduled loads shall be
adjusted by the means of calibrated manometers tolerance for reading taken for the pressure
gauges shall not exceed 2 %, the latter shall be secured by calibrated suitable manometers
(calibration certificates shall be submitted to the consultant before each test). The test system
shall be established under the supervision of Kashem N Company Ltd. Site Engineer under the
Test System described in this procedure.
The Foundation Pile Diagnostic System will be used to test the integrity of the piles (By the third
party),
This involves striking a pile head with a hammer and picking up the response of the pile utiliz-
ing an accelerometer pressed onto the top of the pile.
Contact Us
Head Office: House # 152/1, Tejkuni Para, Tejgaon, Dhaka-1208.
Corporate Office:House # 56 (1st Floor), Road # 4, Sector-5, Uttara, Dhaka.
E-mail: info@ kncbd.com Website: www.kncbd.com
KASHEM N COMPANY LIMITEDHead Office: House # 152/1, Tejkuni Para, Tejgaon, Dhaka-1208. Corporate Office: House # 56 (1st Floor), Road # 4, Sector-5, Uttara, Dhaka.
