Anchor cable breakage impact buffering and protecting device

Abstract

The invention provides an anchor cable breakage impact buffering and protecting device which comprises a cone plug and an opening cylinder, wherein the cone plug and the opening cylinder are sequentially sleeved on an anchor cable. The cone plug comprises a conical barrel provided with a center through hole. Three radial through holes which are communicated with the center through hole and distributed in a 120-degree mode are formed in the outer wall of the conical barrel. A hole entering segment of each radial through hole is provided with an expanding preformed hole. A pre-tightening pin and a spring sleeved on each pre-tightening pin are arranged inside each radial through hole. A hole opening of each radial through hole is provided with a sealing nut. The opening cylinder comprises an inner bore-hole sleeve provided with a penetrating groove along the axial direction. A plurality of axial notches are evenly distributed in the wall of the large bore-hole end of the inner bore-hole sleeve. The buffering and protecting device is arranged on the anchor cable. When the anchor cable is broken, the anchor cable drives the cone plug to move towards the direction of the hole opening. When the cone plug is plugged into the opening cylinder, the opening cylinder is expanded under the effect of pressure of the cone plug and the pre-tightening pin, frictional force between the opening cylinder and the drill hole wall is strengthened so that movement of the cone plug and the anchor cable can be restricted, and buffering protection of anchor cable breakage impact can be achieved.

Description

technical field [0001] The invention relates to an anchor cable fracture impact buffer protection device, which is especially suitable for technical fields such as mining roadway support or water conservancy project excavation support. Background technique [0002] At present, anchor cable support technology has been widely used in geotechnical engineering reinforcement in mining and water conservancy and hydropower development. Especially in coal mine underground roadway support, the proportion of anchor cable support is gradually increasing, and some roadways in which the ground stress is relatively high are required to "see the anchor cables" during underground construction. The promotion of prestressed anchor cable technology ensures the safety of underground caverns and coal mine roadways. Studies have shown that the tension of the anchor cable can transfer the stress near the air surface of the surrounding rock to the deep part to the higher strength rock formation, a...

AI Technical Summary

Problems solved by technology

[0003] With the transfer of geotechnical engineering to the deep, the stress in the surrounding rock gradually increases, and the tensile force on the prestressed anchor cable also gradually increases. , the anchor cable may break, and at this time the anchor cable will rush out of the borehole rapidly, posing a great threat to the safety of equipment and personnel

On the other hand, when the surrounding rock in the anchorage section of the anchor cable is relatively soft or there is water, the effect of the anchoring agent will be weakened. When disturbed, such as mining, etc., the anchorage system of the anchor cable may also fail, causing the anchor cable to detach. drilling

[0004] In geotechnical engineering, there is currently no device that can effectively prevent the anchor cable from breaking out of the drill hole. For example, in some coal mine roadways, the iron wire is wound on the anchor cable lock, and then the iron wire is connected to the anchor net. To buffer the movement of the anchor cable after it breaks, because the strength of the iron wire, especially the connection between the iron wire and the anchor net is low, it cannot withstand the huge impact when the anchor cable breaks

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