In the operation of installing self drilling anchor bar,there are some points that you should pay attention to.
1.The anchor plate is not verticle with bolt axis:There are two ways to solve this problem,the first is install
a wedge block under nuts,the second is that do not put force before the mortar was solidfied.
2.When grout is leaked from the borehole,spray cenment grout into the foundation with the range of 5m to prevent the leak of grout in the construction.
3.When the mixture of grout occur:the mixed slurry hole and grouting hole should be grouted simultaneously,multiple anchors can be grouted with one grouting machine.
4.When the leak appear in the construction:adopt the way of low-pressure, thick paste, current limiting, intermittent injection grouting or use other filler to block a major thoroughfare and then take the first approach.
Measures to guarantee the qualification
1.Check the repaired parts strictly according to the construction criterion and the quality documents.
2.Check by your own and then submit to the authority,the next program can be operated when it's qualified.
3.Pulling resistance should satisfy the requirements.
4.The material,type,quality,specification,quantity and mechanical properties should be in accordance with requirements,the grouting pressure of hollow anchor bar should not be less than standard specification and the grouting should be full.