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A radial single-end double-expansion grouting bolt for tunnels in broken rock formations

A technology for grouting bolts and tunnels, which is applied in the installation of bolts, mining equipment, earthwork drilling, etc., can solve the problems of high construction cost and long time, and achieve the effect of flexible layout, flexible layout and convenient construction.

Active Publication Date: 2022-05-17
SHANDONG UNIV +4
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional radial reinforcement of tunnels in broken rock formations mostly adopts advanced small conduits or large conduit sheds, which are costly and time-consuming to construct.

Method used

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  • A radial single-end double-expansion grouting bolt for tunnels in broken rock formations
  • A radial single-end double-expansion grouting bolt for tunnels in broken rock formations
  • A radial single-end double-expansion grouting bolt for tunnels in broken rock formations

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0018] Example: A radial single-ended two-way expansion grouting bolt for a broken rock formation tunnel

[0019] Such as Figure 1-3 As shown, the radial single-ended two-way expansion grouting anchor rod of the broken rock formation tunnel includes the outer steel pipe 7 of the anchor rod, the hollow threaded steel pipe 6, the conical jacking head 8, the grouting bag 10 and the bolt 11; Embedded in the outer steel pipe 7, the bolt 11 is threadedly connected with the hollow threaded steel pipe 6, and is arranged above the outer steel pipe 7, the length of the outer steel pipe 7 is shorter than the hollow threaded steel pipe 6, and the bottom of the outer steel pipe 7 is provided with a gap 12, hollow The middle part of the threaded steel pipe 6 is provided with a conical jacking head 8, the diameter of the outer edge of the conical jacking head 8 is larger than the outer diameter of the outer steel pipe 7, the bottom of the hollow threaded steel pipe 6 is connected with a gro...

Embodiment approach

[0022] Insert the grouting pipe 5 into the hollow threaded steel pipe 6, and inject grout into the bottom grouting bag 10 to squeeze the surrounding rocks; after the grout in the grouting bag 10 is stable, pull out the grouting pipe 5, The hollow threaded steel pipe 6 is grouted, and the cement mortar is filled into the broken rock formation through the grouting hole 9 to complete the bolt reinforcement.

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Abstract

The invention relates to a radial single-ended two-way expansion grouting bolt for a broken rock formation tunnel, which includes a steel pipe outside the bolt, a hollow threaded steel pipe, a conical jacking head at the upper end, a grouting bag and bolts; the hollow threaded steel pipe is embedded in In the outer steel pipe, the bolts are threadedly connected with the hollow threaded steel pipe and arranged above the outer steel pipe. The length of the outer steel pipe is shorter than that of the hollow threaded steel pipe. The diameter of the outer edge of the conical jacking head is greater than the diameter of the outer steel pipe, the bottom of the hollow threaded steel pipe is connected with a grouting bag, and the hollow threaded steel pipe between the conical jacking head and the grouting bag is provided with a grouting hole. The invention can effectively enhance the stability of the surrounding rock of the broken rock layer tunnel, reduce the collapse of the broken rock layer caused by tunnel construction, reduce the engineering construction cost and increase the engineering construction speed.

Description

technical field [0001] The invention relates to a radial single-end double-expansion grouting bolt for a broken rock formation tunnel, in particular to a novel grouting bolt suitable for reinforcing the surrounding rock of a broken rock formation tunnel, and belongs to the field of underground engineering. Background technique [0002] With the development of my country's construction of a powerful country in transportation, the construction scale of high-grade highways and railway tunnels continues to expand, and tunnel engineering construction inevitably passes through areas of broken rock formations; after the initial state of broken rock formations changes, it is very easy to cause rock formations to collapse, endangering the lives of builders Safety. However, the traditional radial reinforcement of tunnels in broken rock formations mostly adopts advanced small conduits or large conduit sheds, which are costly and time-consuming to construct. It is well known that in the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21D20/02E21D21/00
CPCE21D20/021E21D21/0026Y02E10/20
Inventor 武科徐嘉祥韩宇聪李国栋陈榕邢志豪段景川周石喜张宏伟郝冬雪杨洪娜孙纪正
Owner SHANDONG UNIV
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