How to install MBT rebar couplers?

14 May 2024 Construction 290

"The MBT coupler range provides a cost-effective method of joining reinforcing bars, particularly when the fixed bar is already in place and there is insufficient space for a hydraulic swaging press. They are easy to install and achieve failure loads higher than 108% of the characteristic yield strength of grade 500 reinforcing bar. Neither bar end preparation to form threads, nor bar rotation is required. MBT couplers can also be used to join imperial or metric plain round or deformed reinforcing bars, making it ideal for alteration or refurbishment projects."

Mitro industries MBT Couplers must be correctly installed to ensure that the full working capacity can be achieved. The coupler should be complete with the correct number of bolts and the two serrated strip saddles in place inside the coupler. For correct installation, all the bolts must be tightened until the heads shear off.

1. Place coupler over the end of the bar to half the coupler length +/- 6mm and finger tighten the lock shear bolts onto the bar. Check the alignment and make any necessary adjustments.

2. Place other bar end into the coupler until it pushes up against the first bar and finger tighten the remaining lock shear bolts. Check the alignment and make any adjustments.

3. The lock shear bolts should be tightened using either a ratchet wrench, electric or pneumatic power tool. Do not use impact power tools.

4. On one half of the coupler, starting from the centre of the coupler and working outwards, towards the end of the coupler, partly tighten all of the lock shear bolts using the appropriate tool.

5. Repeat step 4 again, starting from the centre of the coupler and working towards the end of the coupler, fully tighten all of the lock shear bolts, using the appropriate tool, until the bolt heads shear off.

6. Steps 4 and 5 to be completed for the other half of the coupler.