Reinforcing

8/9/2019 Reinforcing

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Readers are advised to check the validity of this C ertificate by either referring to the BBAs w ebsite (w w w .bbacerts.co.uk) or contactingthe BBA direct (Telephone H otline 0 1923 665400).

1 RequirementsThe requirem ents for proprietary m echanical joints in reinforcing bars arecontained in the M anual of C ontract D ocum ents for H ighw ay W orks (M C H W ):

(a) Volum e 1 Specification for H ighw ay W orks Series 1700 StructuralC oncrete.

(b) Volum e 2 N otes for G uidance on the Specification for H ighw ay W orksSeries 1700 Structural C oncrete.

(c) Standard BD 2 4/92.

Regulations

2 Construction (Design and M ana gement) Regulat ions 19 94 (as amended)

Construction (Design and M ana gement) Regulations (N orthern Ireland)

19 95 (as amended)

Information in this Certificate may assist the client, planning supervisor,designer and contractors to address their obligations under these Regulations.

See sections: 4 D elivery and site handling (4.1 to 4 .4) and 7 Practicability

of installation.

An con Building Prod uctsPresident W ayPresident ParkSheffield S4 7U R

Tel: 01 14 2 75 52 24 Fax: 01 14 2 38 12 40e-m ail: info@ ancon.co.uk

w ebsite: w w w .ancon.co.uk

Roads and BridgesAg rme nt Certifica te

N o 9 8 / R1 0 2Third issue*

Designated by G overnm ent

to issueEuropean TechnicalApprovals

AN CO N (M BT) ET-TYPE CO UPLERSRaccords pour arm aturesVerbindung fr Arm atur

Product

TH IS C ERTIFIC ATE REPLAC ESC ERTIFIC ATE N o 95 /R089 A N DRELATES TO AN C O N (M BT)

ET-TYPE C O UPLERS.

The couplers are for the m echanicalconnection of straight, deform ed high

yield carbon steel bars (grade 500)for the reinforcem ent of concrete toprovide jointed bars that can be

subjected to shear, com pressive ortensile stresses.

Reinforced concrete highw ay

structures incorporating the couplersm ust be designed in accordance w ith

the requirem ents of the H ighw ays

Agency (H A ); acting on behalf of the

D epartm ent for Transport, the Scottish

Executive Developm ent Departm ent,

the W elsh Assem bly G overnm ent,and the Departm ent for Regional

Developm ent, N orthern Ireland; andthe conditions set out in the Design

Data and Installation parts of thisC ertificate.

The couplers are installed using ahand ratchet, pneum atic or electric

w rench.

C I/SfB

(21) H h

Highways Agency Requirements

Electronic CopyElectronic CopyElectronic Copy


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Technical Specification

3 Description

3.1 Ancon (M BT) ET-Type C ouplers are availablefor joining straight deform ed high-yield carbon steelbars (grade 500) in accordance w ith BS 4449 :2005.

3.2 The couplers com prise:

steel sleeve m anufactured from hot-rolled,seam less steel tubing. Each sleeve is drilled andtapped for the appropriate num ber of bolts (seeTable 1). Saddles (high-tensile steel strips w ithserrated faces) are tig w elded at the saddleends, tw o saddles per sleeve. Sleeves can alsobe supplied w ith a centre stop, fixed in positionto provide accurate location of the coupler onthe reinforcing bars.

Table 1 C oupler specifications

C oupler N ominal C oupler O verall Approx N o of M inim umreference bar outside length w eight bolts failure

diam eter diam eter including per load

bolts sleeve 115% Cv(1)

(m m ) (m m ) (m m ) (kg) (kN )

ET10 10 33.4 100 0.52 4 45.1

ET12 12 33.4 140 0.71 6 65.0

ET16 16 42.2 160 1.25 6 115.6

ET20 20 48.3 204 2.03 8 180.6

ET25 25 54.0 258 3.00 8 282.3

ET32 32 71.0 312 6.50 10 462.3

ET40 40 81.0 484 11.30 14 722.8

(1) C haracteristic strength (C v) is that value of yield stress below w hich fall

not m ore than 5% of the test results w here tests are carried out in

accordance w ith BS 4 449 : 2005 : Annex E. C haracteristic strengthfor grade 500 deform ed high yield steel is 500 N m m 2. For

verification purposes, test specim en dim ensions should com ply w ith

Ancon Building Productsspecifications.

lockshear bolts steel bolts, incorporatinghexagonal heads and reduced diam eter shankshear planes and conical ends (see Figure 1).

Figure 1 Typical coupler

centre stop pin (optional feature) for bar

location.

3.3 The range of assessed couplers w ith

dim ensions and characteristics is show n in Table 1 .

Locking mechanism

3.4 ET-Type couplers are designed so that, as

bolts are tightened, they penetrate the reinforcingbar, sim ultaneously forcing the bar into the serrated

surface of the tw o saddle strips (see Figure 1).3.5 The bolt shank diam eter is reduced to ensure

that bolt heads w ill shear off at a predeterm inedtorque. At this torque the required bite depth and

thus, the required resistance to axial pull-out, are

achieved.

3.6 M aterials used in the m anufacture of thecouplers are listed in Table 2.

Table 2 M aterial specification

C om ponent Specification

Sleeve tube m inim um ultim ate tensile strength 60 0 N m m 2,

elongation 1 8% m inim um

Bolt m inim um tensile strength 525 N m m 2

Saddle m inim um tensile strength 70 0 N m m 2

3.7 Q uality control checks include:

Raw materials

sleeves and saddles

C ertificates of C onform ity w ith coupler

specification

Incoming goodsbolts

m ill certificates w ith bolt specification

shear torque(1)

bolt body hardness(1)

cone hardness(1)

dim ensional accuracy(1)

(1) Representative bolt sam ples selected in accordance w ith

a predeterm ined sam pling plan.

saddles

visual inspection hardness of teeth

dim ensional accuracy

Production

visual checks

dim ensional accuracy

periodic tensile testing.

4 Delivery and site ha ndling

4.1 C ouplers com plete w ith bolts and installation

instructions are supplied in polythene bags. Thecoupler type and batch num ber (eg ET32 667M )

are recorded on the installation instructions. Eachindividual coupler sleeve is also hard stam ped on

the outside, at one end, w ith the sam e inform ation.

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Installation

9 Genera l

9.1 Installation of Ancon (M BT)ET-Type C ouplers

m ust be carried out strictly in accordance w ith the

m anufacturers instructions, DfT, H A requirem ents

and this C ertificate.

9.2 A typical installation is show n in Figure 3 .

Figure 3 Typical installation

9.3 The ends of reinforcing bars to be coupled

should be cut or sheared to norm al practice. The

surface condition of the bars should m eet DfT, H A

requirem ents.

9.4 The sleeve m ust be centrally located over the

point of contact betw een the reinforcing bars.

9.5 C are m ust be taken w hen inserting reinforcing

bars into the coupler sleeve, excess force m ay result

in loss of or displacem ent of the serrated saddlesand w ill com prom ise the connection efficiency.

1 0 Procedure bolt t ightening

10.1 The coupler should be placed over the end

of the fixed bar to a distance of a half coupler

length [ 6 m m or until centre pin (w here supplied)

butts against bar end]. The bolts are finger-

tightened into the sleeve and alignm ent checked

and adjusted if necessary (see Figure 4).

10.2 The second bar end is placed into thecoupler until it butts against the fixed bar or coupler

centre pin (w here supplied), and the rem aining

bolts are secured finger-tight in position, again

checking for alignm ent (see Figure 4).

10.3 The lockshear bolts are fully tightened usinga hand ratchet, pneum atic or electric w rench untilbolts shear off. Bolts can be tightened in any order(see Figure 4). Sheared bolt heads w ill varybetw een being approxim ately flush w ith the surfaceof the coupler sleeve and projecting up to 4 m m ,dependent upon the coupler size and bolt locationversus rebar rib location.

Figure 4 Installation procedure

10.4 A hand ratchet, pneum atic (air nut runner) orelectric w rench delivering a steady force to thebolts should be used w ith the appropriate sockets.The w rench w ill have a square drive of forET10, ET12, ET16 and ET20 and 1for sizesET25 , ET32 and ET40. W here large num bers ofcouplers are being installed, the use of apneum atic or electric w rench m ay be m oreefficient(1). Thread failure can occur under theapplication of eccentric load, therefore theequipm ent used for installation m ust be inaccordance w ith the recom m endations of thisC ertificate.

(1) Details available from the C ertificate holder.

10.5 C are m ust be taken to ensure excess w aterdoes not rem ain w ithin the coupler prior tocom pletion of the joint.

10.6 W here the target slum p of the concrete isless than 1 00 m m the ends of the coupler shouldbe filled w ith cem ent grout prior to casting toprevent any ingress of w ater.

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Technical Investigations

The follow ing is a sum m ary of the technicalinvestigations carried out on A ncon (M BT) ET-TypeC ouplers.

11 Tests

Tests w ere carried out to determ ine:

dim ensional accuracy tensile strength of joints

practicability of installation

perm anent deform ation after loading to 0.6 tim esthe specified reinforcem ent characteristic strength

bolt shearing torque

fatigue perform ance of the couplers w hensubjected to axial stress in air

fatigue perform ance of concrete beam s w ithreinforcing bars joined by the couplers.

12 Investigations12.1 The m anufacturing process w as exam ined,including the m ethods adopted for quality control,and the quality and com position of the m etals usedw ere assessed. An evaluation w as m ade relating to:

stress/strain relationships

cyclic tensile tests

strength under com pressive loading

durability

contam ination of joints

effect of creep perform ance of the loaded coupler underincreased tem perature conditions.

12.2 A site visit has been carried out to evaluatethe practicability of installation.

12.3 An exam ination w as m ade of AnconBuilding Productsinstallation instructions, and ofthe products in relation to DfT, H A requirem ents.

12.4 Technical data w ere assessed by the LossPrevention C ouncil (LPC ) on behalf of the BBA

concerning the behaviour of the couplers underincreased tem perature.

Bibliography

BS 4449 : 20 05 Steel for the reinforcem ent ofconcrete W eldable reinforcing steel Bar, coiland decoiled product Specification

BS 540 0-4 : 19 90 Steel, concrete and com positebridges C ode of practice for design of concretebridges

BS 5400 -10 C : 19 99 Steel, concrete andcom posite bridges C harts for classification ofdetails for fatigue

BD 2 4/9 2 : 1992 The design of concrete highw aybridges and structures use of BS 5400-4 : 1990

BD 57/01 Design for Durability

M anual of C ontract Docum ents for H ighw ayW orks, Volum e 1 Specification for H ighw ayW orks,August 1998 (as am ended)

M anual of C ontract Docum ents for H ighw ayW orks, Volum e 2 N otes for G uidance on theSpecification for H ighw ay W orks,August 1998(as am ended)

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Conditions of Certification

13 Conditions

13.1 This C ertificate:

a) relates only to the product that is nam ed,described, installed, used and m aintained as setout in this C ertificate;

(b) is granted only to the com pany, firm or person

identified on the front cover no other com pany,firm or person m ay hold or claim any entitlem ent tothis C ertificate;

(c) is valid only w ithin the U K;

(d) has to be read, considered and used as aw hole docum ent it m ay be m isleading and w illbe incom plete to be selective;

(e) is copyright of the BBA;

(f) is subject to English law .

13.2 References in this C ertificate to any Act of

Parliam ent, Regulation m ade thereunder, Directiveor Regulation of the European U nion, StatutoryInstrum ent, C ode of Practice, British Standard,m anufacturersinstructions or sim ilar publication,are references to such publication in the form inw hich it w as current at the date of this C ertificate.

13.3 This C ertificate w ill rem ain valid for anunlim ited period provided that the product and them anufacture and/or fabrication including allrelated and relevant processes thereof:

(a) are m aintained at or above the levels w hichhave been assessed and found to be satisfactoryby the BBA ;

(b) continue to be checked as and w hen deem edappropriate by the BBA under arrangem ents that itw ill determ ine;

(c) are review ed by the BBA as and w hen itconsiders appropriate; and

(d) rem ain in accordance w ith the requirem ents ofthe H ighw ays Agency.

13.4 In granting this C ertificate, the BBA is notresponsible for:

(a) the presence or absence of any patent,intellectual property or sim ilar rights subsisting in theproduct or any other product;

(b) the right of the C ertificate holder to m arket,supply, install or m aintain the product; and

(c) the actual w orks in w hich the product isinstalled, used and m aintained, including thenature, design, m ethods and w orkm anship of suchw orks.

13.5 Any recom m endations relating to the use orinstallation of this product w hich are contained orreferred to in this C ertificate are the m inim umstandards required to be m et w hen the product isused. They do not purport in any w ay to restate therequirem ents of the H ealth & Safety at W ork etcAct 1974, or of any other statutory, com m on lawor other duty w hich m ay exist at the date of thisC ertificate or in the future; nor is conform ity w ithsuch recom m endations to be taken as satisfying therequirem ents of the 1974 Act or of any present orfuture statutory, com m on law or other duty of care.In granting this C ertificate, the BBA does notaccept responsibility to any person or body for anyloss or dam age, including personal injury, arisingas a direct or indirect result of the installation anduse of this product.

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In the opinion of the British Board of Agrment, Ancon (MBT) ET-Type Couplers are fit for their

intended use provided they are installed, used and maintained as set out in this Certificate.

Certificate No 98/ R102 is accordingly awarded to Ancon Building Products.On behalf of the British Board of Agrment

Date of Third issue: 9th December 2005 Chief Executive

*O riginal C ertificate issued on 7th Septem ber 1998. This am ended version includes a change to the grade of steelbars, updated standards, and reference to the revised C onditions of C ertification.



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British Board of AgrmentP O Box N o 1 95, Bucknalls Lane

G arston, W atford, H erts W D25 9BA

Fax: 01 92 3 6 65 30 1

2005

For technical or additional information,contact the C ertificate holder (seefront page).For inform ation about the Agrm entC ertifica te, including validity and

scope, tel:H otline 01923 665400,or check the BBA w ebsite.

e-m ail: m ail@ bba.star.co.uk

w ebsite: w w w .bbacerts.co.uk


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Reinforcing