When excavate developmental joint broken hard rock ，can lead to rock fragment be slack, friction reducing, cause a large area of surrounding rock slack, finally surrounding rock instability, collapse, thus prestressed Grouting bolt can be used to support to keep its stability.
|
Item |
LY25 |
LY27 |
LY28 |
LY32 |
|
Ultimate
load（KN） |
80 |
100 |
100 |
120 |
|
Outside diameter（mm） |
52 |
58 |
58 |
65 |
|
Anchor rod |
LH25 |
LH27 |
LH28 |
LH32 |
|
Mark |
tensile strength and length can be designed according to costomer requirement |
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construction technology
1, prestressed anchor installation and prestressing exerting
1) drill hole and cleaning;
2) insert anchor bolt which installed expanding-shell in anchor head.
3) prestress bolt, turn the bolt to the left to tighten it, then install the stopping grouting plug, anchor plate, nuts ;
4) connect tensioning tool (such as bolt tension meter), implement pre-stressed tension until reach specified value.
2, Grouting
1） Push into the grouting machine, and connect the grouting pipe and power source;
2） Mix grout according to design proportion, and put it into the Grouting machine
3） Start the grouting machine, inject grout to anchor holes, until the Grout pressure reached the design value
4） Take down the grouting coupling, then continue next anchor grouting, until all the bolt grouting are completed; Cleaning equipment |
