BAMTEC Detailing Manual

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Copyright OneSteel Reinforcing Pty Limited PO Box 55 Five Dock NSW 2046 Australia ABN 2 004 148 289

© OSR107 10/02

BAMTEC Detailing Manual

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Copyright OneSteel Reinforcing Pty Limited PO Box 55 Five Dock NSW 2046 Australia ABN 2 004 148 289 This information is provided as a service to those interested in steel reinforcement. Since the information is provided for general guidance only, and in

no way replaces the services of professional consultants on particular projects or subjects, no legal liability can be accepted by OneSteel for its use.

Contents

Item Page No. General

Introduction to BAMTEC® 3 Slab Shapes 3

Slab Types 4

Bar Size and Spacing 5

Additional Reinforcing 5

Specifying BAMTEC® reinforcing 5

Columns 6 Walls 11 Beams 16 Standard Beams 16 Edge Beams 18 Band Beams 20

Step Downs 21 Construction Joints 21

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General Introduction to BAMTEC® BAMTEC® is a system developed to assist with the fast, accurate and economical placement of reinforcing bars in a reinforced concrete slab. It was developed in Germany and OneSteel Reinforcing have the licence to market the product in Australia. BAMTEC® is straight reinforcing bars spot welded to a number of continuous metal straps and rolled around shape forming rings to create a BAMTEC® carpet. The carpets are delivered to site, lifted into position and unrolled like a roll of carpet. The BAMTEC® system is supported by CAD software that assists in the generation of BAMTEC® carpets. Changes to standard construction details may be required to best utilise BAMTEC®. Slab Shapes The BAMTEC® system is ideal for complicated slab shapes as it is scheduled using a CAD package and bars are positioned in the BAMTEC® carpets accurately by computer driven manufacturing equipment. There is a general requirement that BAMTEC® carpets must roll from the widest section of slab to the narrowest so that they do not overhang formwork or clash with other slab end restrictions.

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Slab Types The BAMTEC® system best suits a flat plate slab type design, with or without drop panels, however it can be incorporated into beam and slab type designs.

Flat Plate Slab Design

Beam and Slab Design

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Bar Size and Spacing 500PLUS® reinforcing bar of 10mm to 32mm diameter and ribbed wire of 8mm to12mm diameter can be incorporated into the BAMTEC® carpets. The production machinery imposes a minimum spacing of 50mm between bars and OneSteel Reinforcing limit the maximum spacing to 300mm between bars. Various combinations of bar size and length can be incorporated into any one BAMTEC® carpet. A minimum bar length of 1.7m is required to achieve a rollable carpet. Additional Reinforcement Additional reinforcing can be tied to the carpets once laid if required, however the BAMTEC® system can incorporate them in the BAMTEC® carpets as long as bar spacing does not encroach the 50mm minimum bar spacing requirement. Specifying BAMTEC® reinforcing BAMTEC® can be drawn up as for conventional reinforcing or the required minimum design steel intensities (mm2/m) can be provided for more efficient use of reinforcing.

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Columns BAMTEC® carpets cannot be rolled over column starters that protrude more than 100mm above the slab soffit. This may require standard slab and column details or construction practices to be altered to suit the most appropriate method for each project. The options available are as follows:

1) Detail BAMTEC carpets to roll up to the edge of columns and provide lap bars and some extra loose bars to make the slab reinforcement continuous around the columns.

2) The use of a coupling system to join column bars just above the slab soffit. It is preferred

if the bars to be coupled are splice bars that lap with the main column reinforcement, this allows the next lift of column steel to be prefabricated improving placement efficiency.

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3) Back pouring of column allows column steel to be placed after placing BAMTEC® carpets

which incorporate a penetration for the column steel. Lap bars are required to make the slab reinforcement continuous around the column.

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4) A variation to 3 above is to part pour column so that the lapping of column steel occurs

below the slab soffit.

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5) The use of a precast column element to eliminate lap bar protrusion.

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Walls BAMTEC® carpets cannot be rolled over wall starters that protrude more than 100mm above the slab soffit. This may require standard slab and wall details or construction practices to be altered to suit the most appropriate method for each project. The options available are as follows:

1) Detail BAMTEC® carpets around the wall and provide lap bars to make the bottom slab reinforcement continuous over the wall. Top steel will need to be loose tied.

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2) Bend wall starter bars into the slab in a direction parallel to the wall. If the wall is to be

continuous, then place new starter bars in the slab after BAMTEC® carpet placement.

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3) Bend wall bars perpendicular to the wall and tie a dummy bar to the top of the wall bars to

allow rolling of bottom BAMTEC® carpets. Remove dummy bar once bottom BAMTEC® carpets have been placed, this will allow bottom carpets to drop into the correct position.

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4) Precast walls can remove rolling restrictions which suits the BAMTEC® system.

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5) Insitu walls can be handled with a starter bar system such as Rebox if the construction process favours jump or slip form. Otherwise insitu walls can be handled using lapping ‘U’ bars at the top and bottom of the wall.

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Beams Where possible the BAMTEC® system best suits a flat plate slab type design, however it can be used with beam and slab type designs. To incorporate BAMTEC® with beams, consideration must be given to the installation process when detailing, as beams with ligatures can be restrictive to carpet rollout. Standard Beams

Standard beams can be handled in various ways; some are detailed below. 1) Incorporating a lap bar into the standard detail to allow the bottom BAMTEC® carpets to be

rolled short of the beam and then made continuous with the lap bar through the beam.

2) Changing the reinforced beam placement process to allow a prefabricated cage to be lowered into place after the bottom BAMTEC® carpets have been placed. This method requires the steel fixer to reach to the bottom of the beam cage to re-position beam bars once the beam has been placed, so this method should be restricted to a beam with a depth 500mm, or less, below the slab soffit.

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3) Place beam steel into position, roll out bottom BAMTEC® carpet over the beam. Once bottom BAMTEC® carpet has been placed remove the required top beam bars to allow the BAMTEC® carpet to fall into the required position then re-tie the beam bars into their correct position. This method would be suitable for slabs up to 200mm thick.

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Edge Beams Edge beams can be handled in various ways; some are detailed below. 1) Changing the reinforced beam placement process to allow a prefabricated cage to be lowered

into place after the bottom BAMTEC® carpets have been placed. This method requires the steel fixer to reach to the bottom of the beam cage to re-position beam bars once the beam has been placed, so this method should be restricted to a beam with a depth of 500mm, or less, below the slab soffit.

2) Incorporating a lap bar into the standard detail to allow the bottom BAMTEC® carpet to be rolled short of the beam and then be made continuous with the lap bar.

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3) Changing the reinforced beam placement process to allow a prefabricated cage to be lowered

into place after the bottom BAMTEC® carpets have been placed. This method requires the steel fixer to reach to the bottom of the beam cage to re-position beam bars once the beam has been placed, so this method should be restricted to a beam with a depth of 500mm, or less, below the slab soffit. A special ligature shape is used to allow the top reinforcing lap bar to be incorporated within the beam cage.

4) Lapping ‘U’ bars in prefabricated or loose form are used to tie both the top and bottom BAMTEC® carpets into the edge beam. Longitudinal bars confined within the ‘U’ bar will need to placed as loose bars.

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Band Beams Standard band beams can be handled in various ways; some are detailed below. 1) For band beams which require ligatures, change the reinforced beam placement process to

allow a prefabricated cage or ligature skeleton to be lowered into place after the bottom BAMTEC® carpets have been placed.

2) For band beams that do not require ligatures, place bottom beam steel and then roll BAMTEC® carpets.

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Step Downs To incorporate BAMTEC® with a step down, the Z bar must be separate from the main slab reinforcing bars. The Z bar can be loose tied or prefabricated into cages and installed before top carpets.

Construction Joint No major changes are required to a construction joint detail when using BAMTEC®. Commonly cogs or hooks are specified on the end of the bars at a construction joint, this must be changed to a U bar tied between the bottom and top carpets (refer type 1). The U Bars can be incorporated into a prefabricated cage to improve speed of placement. If main slab reinforcement is to continue through the joint and lap with the next stage then strap location will need to be specified during scheduling to allow placement of joint formwork. (refer type 2)

BAMTEC Detailing Manual

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