• PICTURE 1

BMMB components and bridge deck installation tools. The electric hammer-drill (as shown) requires a generator.

• Hammer-drill, electric or pneumatic, capable of drilling 12 mm diameter holes in concrete.
• Concrete drills; 6 x 160 mm long and 12 x 120 mm long.
• Drill guide and scratch needle.
• Ratchet with 13 mm and 17 mm diameter sockets.
• Screwdriver - 6 mm wide.
• Punch - 6 mm.
• Hammer of 500 grams.

 • PICTURE 2

All BMMB parts are made of stainless steel.

• Protective cover 1250 mm long.
• Two locking bolts.
• Padlock with two keys.
• Adjusting tool with four bolts.
• Recording plate body (530 mm long) and holder with two fixing bolts (right).
• Scratch needle body (530 mm long) and holder with two fixing bolts (left).
• Recording plate with two screws (right).
• Expansion plugs with bolts (4 No.).

 • PICTURE 3

Recording plate and scratch needle holder bodies, mounted directly onto the bridge deck. The transverse blocks under each of the bodies are designed to keep them clear of uneven surfaces.

 • PICTURE 4

Recording plate and tungsten carbide scratch needle, both with holders, fitted to the bodies. The depth of the needle can be adjusted by the (brown) needle and the screw (in-out).

The cover prevents dirt from entering the system and protects against vandalism.

Recording plate after a one year measuring period. The top scratch shows a movement of 40 mm horizontal and only 1 mm vertical. The lower marks are from a sliding pad.