DRILLING THE HOLE

　　The hole in the concrete, which is receiving the anchor, should preferably be bored using a diamond tipped hollow core drill which will give a clean round smooth hole and be unaffected by the position of reinforcing steel. The drill must be positioned using a moveable drill carriage or similar.

　　For a few holes it should be possible to use a drilling machine using carbide tipped drills, but the machine will require considerable operating force to obtain a suitable clean round hole. Reinforcing steel may in this case be a problem.

　　POSITIONING THE ANCHOR

　　Blow out the hole to clear dust. Thread anchor onto a length of RMD Rapid Tie Bar to the end of the anchor, ensuring full engagement in the threaded cone and insert into the full depth of the drilled hole. A smear of grease onto the outer surface of the inner cone will assist in the setting of the anchor.

　　SETTING THE ANCHOR AND TESTING

　　It is important that each anchor is set and tested using the following procedure:-

　　In order to set the anchor a 120mm length of plastic tube should be slid over the tie bar and against the end of the anchor. A 150 x 150 x 12 (x26 Dia hole) plate washer should be slid over the tie bar and against the concrete. A hollow hydraulic jack may now be threaded onto the tie bar and fastened securely with a second washer plate and a wing nut. A load of 100kN should be applied.This will test the anchor and firmly expand

　　it into the concrete.

　　The wing nut, washers, tube and tie bar may now be removed until the connection is required to be made for formwork or other purposes.

　　CONNECTING THE ANCHOR

　　When the final connection to the anchor is required, the tie bar should be inserted into the hole and screwed in until the end of the tie bar is in contact with the end of the hole. This is most important since the anchor will have slipped by10-20mm during the application of the test load. It is better if the fitting of the tie bars is left until the

　　formwork is in place. This will prevent the possibility of the form hitting the tie bar and so

　　loosening the anchor.