Details that are easily overlooked in the use of anchor bolts
Although friction rock bolt support has many advantages such as instant bearing, large preload, good support effect, low labor intensity and low support cost, it is more and more favored by construction units. However, if it is used, unscientific construction methods will still have the opposite effect, because mastering the correct construction methods has an important impact on the role of bolt support. Here are a few things to keep in mind when using this technology:
When excavating the coal roadway, the roof and two sides of the roadway should be kept flat. It is suggested that the principle of not destroying the integrity of the roof and reducing the blasting vibration of the roadway side coal body should be used to avoid stress concentration around the roadway and ensure the stability of the roadway.
The roof friction rock bolts are not all arranged in the vertical direction of the roof, and should be radial. The broken rock formation gaps should be filled with cement grouting to ensure that the bolts have sufficient anchoring force.
The friction rock bolt must have a supporting structure and generate a certain anchoring force. The grouting wire rope anchor without the anchoring force cannot form an active support, so it cannot be used for coal roadway support.
The above-mentioned precautions for friction rock bolt support can be used as a reference in the construction in the future, and I hope it will help you.
