Method for improving stability of primary support structure in soft rock tunnel construction

A technology for structural stability and tunnel construction, which is applied in earth-moving drilling, mining equipment, installation of anchor rods, etc. Anchoring effect, strong drilling rig mobility, and the effect of improving grouting quality

Active Publication Date: 2021-03-19
CHANGAN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patented technology improves upon previous methods for constructing temporary passages within rocks during excavation operations. It involves creation of an enclosed passage with a reinforced structure called a tunnel bolt or anchor rod system. These systems allow for flexibility, quick response, less expensive equipment compared to older methods like punch holes, while still providing effective stabilization against subsidence issues caused by weaknesses found at deeper depth levels along roadways. Additionally, this new method allows for easier installation without damaging existing infrastructure components used around these areas. Overall, this innovative technical solution enhances safety, reliability, and productivity in exploration projects.

Problems solved by technology

This patented describes various techniques aimed at improving the strength and durability of temporary supports (SRB) placed inside hard rock tunnel constructions without causing issues like destabilization caused by water intrusion into them over long periods of time. Current methods involve installing restrain anchor bolts onto certain parts of the building' s walls, but these current processes require multiple workers who may also experience difficulty aligning holes correctly. There needs improvement from this new methodology to provide better stabilizing measures against stress buckling and collapse.

Method used

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  • Method for improving stability of primary support structure in soft rock tunnel construction
  • Method for improving stability of primary support structure in soft rock tunnel construction

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Embodiment Construction

[0021] In order to make the content, technical solutions and features of the present invention clearer, the present invention will be further described in detail in conjunction with the accompanying drawings and embodiments.

[0022] The present invention proposes a method for improving the stability of the initial support structure in the construction of the tunnel step method for the three-step construction method, such as figure 2 As shown, the constrained anchor rod 1 of the upper step is located at the arch waist of the upper step, and two are installed between the two adjacent steel frames on the left and right sides of the upper step, a total of four; according to the grouting and pulling test results of the constrained anchor rod , the drawing force of a 6m long φ42 steel pipe is 267kN, and the drawing force of a 6m long φ76 steel pipe is 530-540kN. Obviously, the drawing force of two 6m long φ42 steel pipes is the same as that of a 6m long φ76 steel pipe. equal strength

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Abstract

The invention discloses a method for improving the stability of a primary support structure in tunnel step method construction. An arrangement form of upper step small-pipe-diameter constraint anchoring and middle step large-pipe-diameter constraint anchoring rod is adopted for constraint anchoring; an upper step constraint anchoring rod adopts a hot-rolled seamless steel pipe with the diameter of42-50mm and the length of 6-7m and downward drilling is obliquely performed by 5 degrees to 10 degrees through a handheld air drill; and the middle step constraint anchoring rod is a hot-rolled seamless steel pipe with the diameter of 76-108mm and the length of 6-9m, and downward drilling is obliquely performed by 10 degrees and 20 degrees through a crawler-type down-the-hole drill. The respective advantages of handheld air drill drilling and crawler-type down-the-hole drill drilling are brought into full play, the construction progress of the constraint anchor rods is greatly accelerated, prominent problems that when the constraint anchor rods are prone to grout leaking, difficult in grout stopping, and poor in grouting effect are solved, the supporting effect of the constraint anchor rods is ensured, and the stability of the primary support structure in a soft rock tunnel is effectively improved.

Description

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Claims

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Application Information

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Owner CHANGAN UNIV
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