Hollow grouting bolt is a kind of hollow bolt, which is mostly used in relatively stable and complete rock strata. It uses resin, engineering glue, quick-setting cement and other anchoring agents, which are injected from the center of bolt, and has better anchoring quality than ordinary bolt. Because of the appearance of self-advancing hollow grouting bolt, hollow grouting bolt can also be used in strata under loose rock and soil conditions. rock bolt sizes

A, the number of anchor installation should comply with the design requirements.

Second, the strength grade of mortar, mixture ratio should comply with the design requirements. rock bolt sizes

Three, anchor hole grouting mortar should be full and dense.

The construction unit shall inspect all the anchors, and the supervision unit shall inspect them according to the proportion of 20%. And check the construction records, observe or use ultrasonic anchor tester for inspection. rock bolt sizes

Four, bolt installation deviation should be allowed to meet the following requirements:

1, the bolt hole diameter should comply with the design requirements.

2. The depth of bolt hole should be greater than 10cm of bolt length.

3. The allowable deviation of bolt hole distance is ±15cm.

4. The insertion length of anchor rod shall not be less than 95% of the design length, and it is located in the center of the hole.

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