Construction method applicable to intersection between inclined shaft and slant hole of weak surrounding rock tunnel

A technology of weak surrounding rock and construction method, applied in tunnels, earth-moving drilling, mining equipment, etc., can solve the problems of high construction cost, large amount of support, and many procedures, so as to reduce construction cost, improve construction progress, and improve the overall good performance

Active Publication Date: 2013-03-27
中铁二十三局集团第四工程有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the problems of many procedures, large support volume and high construction cost in the prior art, and provide a tunnel with sim

Method used

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  • Construction method applicable to intersection between inclined shaft and slant hole of weak surrounding rock tunnel
  • Construction method applicable to intersection between inclined shaft and slant hole of weak surrounding rock tunnel
  • Construction method applicable to intersection between inclined shaft and slant hole of weak surrounding rock tunnel

Examples

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Effect test

Embodiment 1

[0042] Example 1 Reference Figure 1~4 , Applicable to the construction method of the intersection of the inclined shaft and the main tunnel of the soft rock tunnel, including the following steps:

[0043] (1) Excavation of Inclined Shaft 2: Excavation of Inclined Shaft 2 and supporting it, at the intersection of Inclined Shaft 2 and Main Tunnel 1 on the tunnel face 3.5m down from the vault of Inclined Shaft 2 (see Figure 4 , Figure 4 Middle L is 3.5m) Start to backfill the cave slag towards the inlet of the inclined well 2, and pave the slope 9 with a slope of 10%;

[0044] (2) Construction of the leading small duct 10: at the arch of the tunnel face at the intersection of the inclined shaft 2 and the main tunnel 1, a 2 / 3 inclined centered on the vertical midline of the tunnel face at the intersection of the inclined shaft 2 and the main tunnel 1. A 5m-long lead tube 10 is applied within the width of the well, the circumferential distance between adjacent lead tubes is 35cm, and ...

Embodiment 2

[0053] Example 2 Take the construction of the intersection of the inclined shaft and the main tunnel of a single-track tunnel with weak surrounding rock and loess as an example, refer to Figure 1~4 , Applicable to the construction method of the intersection of the inclined shaft and the main tunnel of the soft rock tunnel, including the following steps:

[0054] (1) Excavation of inclined shaft 2: Excavation of inclined shaft 2 for support. The construction steps of the support are: first sprayed concrete closed arch wall → anchor rod → hang steel mesh → install steel arch → Compound sprayed concrete closed arch, when bolting operation, use R25 hollow grouting bolts with a length of 2.5m, arranged in a plum blossom shape at a distance of 1.2×1.2m, and use cement mortar of strength grade M20 (with cement and sand) The weight ratio is 1:1) Pouring the anchor rod, the grouting pressure during pouring is 0.5~1.0Mpa; the inclined shaft 2 and the main tunnel 1 are obliquely crossed, an...

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Abstract

The invention discloses a construction method applicable to an intersection between an inclined shaft and a slant hole of a weak surrounding rock tunnel, and the method comprises the following steps that (1) the inclined shaft is dug; (2) the arch part of an inclined shaft section is supported; (3) the vertical central line of a face at the intersection between the inclined shaft and the slant hole serves as a boundary, first a slant hole section on one side of the boundary is dug, and sectional digging is adopted on every side; an area which is enclosed by the arch top of the slant hole, the side walls of the slant hole on both sides and the extended surface of the ramp slope surface of the inclined shaft is a I part; an area which is enclosed by the plane of the intersection line of the ramp slope surface on an inclined shaft digging surface, the side walls of the slant hole on both sides and the extended surface of the ramp slope surface of the inclined shaft is a II part; and an area which is enclosed by the plane of the intersection line of the ramp slope surface on the inclined shaft digging surface, the side walls of the slant hole on both sides and the bottom of the slant hole is a III part; the slant hole section on the other side is dug in a sectional way; (4) supporting and reinforcement are carried out; and (5) inverted arch and lining construction are carried out. According to the method, the deformation of surrounding rock is reduced, some temporary supporting steps are saved on the premise of good safety, so that the procedures are simple, the construction cost is reduced, and the construction progress is improved.

Description

Technical field [0001] The invention relates to the technical field of tunnel construction, in particular to a construction method suitable for the intersection of an inclined shaft and a main tunnel of a soft rock tunnel. Background technique [0002] At present, due to construction period requirements, single-track long and large tunnels often enter the main tunnel section through the addition of an inclined shaft as an auxiliary tunnel, thereby increasing the tunnel excavation face and shortening the construction period. Due to the difference in the structure, size and direction of the tunnel from the inclined shaft to the main tunnel, the working surface for roof picking, excavation and support work from the inclined shaft into the main tunnel is narrow and the supporting capacity is large. [0003] The loess tunnel is a tunnel with weak surrounding rock. The strength of the surrounding rock is low. After the tunnel is excavated, the stress is redistributed. During the construc...

Claims

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Application Information

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IPC IPC(8): E21D9/00
Inventor 章程荀国利张教才薛志鹏刘海杰陈幼林薛俊陈超群
Owner 中铁二十三局集团第四工程有限公司
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