Drilling anchoring pre-supporting system based on shield operation and construction method

Abstract

The invention discloses a drilling anchoring pre-supporting system based on shield operation and a construction method, and aims to provide the drilling anchoring pre-supporting system and the construction method based on the drilling anchoring pre-supporting system. The system comprises an MF quick-change drill rod, a drill shank and an anchor rod; the anchor rod (1) is composed of a drill bit (1-1) connected with an anchoring pipe, a pipe shoe (1-6) connected with the anchoring pipe through a pipe opening lock catch connector and a PVC pipe (1-7) connected with the pipe shoe; and the pipe opening lock catch connector is composed of a lock catch female connector (1-4) connected with the anchoring pipe and a lock catch male connector (1-5) connected with the MF quick-change drill rod (4), and a spiral through groove (1-4-1) of the lock catch female connector (1-4) is matched with a spiral cam groove (1-5-1) of the lock catch male connector (1-5). According to the system, the cutting boundary (7) of the tunnel face (6) is determined firstly, the system is obliquely chiseled into the rock mass (5), the MF quick-change drill rod (4) is withdrawn from the PVC pipe (1-7), and the tunnel face (6) is cut after grouting solidification.

Description

technical field [0001] The invention relates to a tunnel drilling and anchoring pre-support system and a construction method, in particular to a drilling and anchoring pre-support system based on shield tunneling operations, and a construction method based on the drilling and anchoring pre-support system. Background technique [0002] As we all know, the support of underground engineering can be divided into pre-support and post-support according to the construction time of support structure. The support that reinforces the rock strata of the cave body before excavation of the tunnel is called pre-support, and the support that reinforces the rock strata of the cave body after excavation of the tunnel is called post-support. The working face that is constantly advancing during the excavation of the tunnel is called the face of the tunnel. [0003] In order to strengthen the rock formation in the unexcavated area in front of the tunnel face, prevent deformation and collapse o...

AI Technical Summary

Problems solved by technology

[0004] 1) In the complex geological structure with both soft rock and granite layers, the ordinary anchor bit is easy to wear, the drilling efficiency is low, and it is difficult to meet the anchor construction requirements;

[0005] 2) The drill rod and the anchor bit are connected by threads. When the drill rod needs to be withdrawn after reaching the drilling depth, the drill rod or the meshing thread will often produce impact deformation, which will cause the drill rod to get stuck and cannot be anchored. hole exit

It not only wastes the drill rod, but also leads to the scrapping of the anchor hole, and the drill rod stuck in the anchor hole will also damage the cutter head of the shield machine and affect the shield operation;

[0006] 3) The tensile stress needs to be manually adjusted during anchoring, which is cumbersome to operate;

[0007] 4) Since the anchor rod is a metal rod structure, and its tail end is exposed within the boundary of the tunnel face (such as CN19571959A, CN104989437A, CN109026099A, CN108547291A, CN110985066A, CN112963153A, etc.), it is not only easy to cause damage to the shield machine cutter head, Moreover, the anchoring will be loosened due to cutting vibration, which will affect the anchoring quality.

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