Construction method for adopting prestressed component anchor rod to support crumbly strata of mine

Abstract

The invention relates to a construction method for adopting a prestressed component anchor rod to support crumbly strata of a mine. The construction method comprises the following steps drilling a support hole in the crumbly strata of the mine; after drilling is finished, clearing residual rocks in the support hole; uniformly stirring a resin anchoring agent arranged on an anchor head of the prestressed component anchor rod, and inserting the anchor rod is into the support hole, so that the upper end of the prestressed component anchor rod is fixed; pulling down the prestressed component anchor rod, so that an upper supporting device is unfolded and completes self-locking, and a lower spirally lifting supporting device is unfolded; mounting a tray for abutting against a rock wall outside the support hole at the lower part of the prestressed component anchor rod; performing grouting in the support hole through a primary grouting pipe which is arranged on the prestressed component anchorrod and an outlet of which leads to the upper part of the prestressed component anchor rod; and performing secondary grouting through a secondary grouting pipe arranged on the prestressed component anchor rod. The construction method is helpful to solve the problem of construction safety such as rib spalling and roof falling occurring at a broken part of surrounding rock in the process of tunneling in chamber and tunnel stratum.

Description

technical field [0001] The invention relates to a construction method for supporting broken rock formations in mines by adopting prestressed component bolts, which is applicable to the construction fields of support projects such as pit openings and tunnels. Background technique [0002] During the construction process of the broken zone of the hole, it is easy to collapse and fall; the construction safety environment is poor; the quality of the hole support is high and the bearing capacity is large. At present, the commonly used construction method is grouting filling method to deal with the broken zone, which has high cost, poor effect and slow construction speed. As an effective roadway support method, the bolt support can significantly improve the stability of the surrounding rock due to the strengthening effect on the strength of the surrounding rock of the roadway. The strength is reduced, the utilization rate of the roadway section is improved, the maintenance proces...

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Problems solved by technology

[0003] The purpose of the present invention is to provide a construction method using prestressed component bolts to support the broken rock formations of mines, which is beneficial to solve the construction of side walls and roof falls that occur in relatively broken surrounding rocks during the excavation process in caverns and tunnel rock formations safe question

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