(1) Drill holes using bolted trolleys or air guns and clear the holes with high pressure air. When the geology is the yellow earth layer, the coal mine uses the spiral drilled hole.
(2) Insert the hollow anchor with the anchor head installed and the exhaust pipe into the hole at the same time. The barb on the anchor head will immediately hang the anchor rod.
(3) Manually installed stopper plugs, backing plates and nuts.
(4) Connect the anchor rod and the grouting machine with a quick connector.
(5) Open the grouting machine and perform pressure grouting according to the designed grouting pressure.
(6) When the mortar reaches 90% of the design strength, tighten the nut again and apply prestress.
Bolt installation tolerances should meet the following requirements:
1 The hole diameter of the bolt hole should meet the design requirements.
2 The depth of the bolt hole should be greater than 10cm of the bolt length.
3 The bolt hole spacing tolerance is ±15cm.
4 The bolt insertion length must not be less than 95% of the designed length and should be in the center of the hole.
(2) Insert the hollow anchor with the anchor head installed and the exhaust pipe into the hole at the same time. The barb on the anchor head will immediately hang the anchor rod.
(3) Manually installed stopper plugs, backing plates and nuts.
(4) Connect the anchor rod and the grouting machine with a quick connector.
(5) Open the grouting machine and perform pressure grouting according to the designed grouting pressure.
(6) When the mortar reaches 90% of the design strength, tighten the nut again and apply prestress.
Bolt installation tolerances should meet the following requirements:
1 The hole diameter of the bolt hole should meet the design requirements.
2 The depth of the bolt hole should be greater than 10cm of the bolt length.
3 The bolt hole spacing tolerance is ±15cm.
4 The bolt insertion length must not be less than 95% of the designed length and should be in the center of the hole.
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