Excavation support structure and construction method for an auxiliary cavern of a sandy gravel layer tunnel

A technology for supporting structures and stone layers, applied in water conservancy projects, buildings, hydroelectric power stations, etc., can solve the problems of easy loosening of the surrounding rock of the sand and gravel layer, high construction safety risks, and difficulty in initial support, so as to reduce the excavation rate. The effect of supporting difficulty, flexible and fast installation, and reducing the amount of excavation works

Active Publication Date: 2019-04-09
GEZHOUBA GROUP FOUND ENG
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide an excavation support structure and construction method for the auxiliary cavern of the sandy gravel layer tunnel, which can solve the problem of increasing the excavation section and the free surface at the junction of the sandy gravel layer tunnel and its subsidiary cavern. During the excavation construction, the surrounding rock of the sand and gravel layer is prone to loosening and collapse, which leads to difficulties in initial support, high construction safety risks, and low construction efficiency, ensuring the continuity and safety protection ability of the initial support of tunnel excavation construction , realizing the safe and efficient construction of the excavation of the auxiliary chamber of the tunnel in the sand and gravel layer

Method used

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  • Excavation support structure and construction method for an auxiliary cavern of a sandy gravel layer tunnel
  • Excavation support structure and construction method for an auxiliary cavern of a sandy gravel layer tunnel
  • Excavation support structure and construction method for an auxiliary cavern of a sandy gravel layer tunnel

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Embodiment 1

[0034] like figure 1 and figure 2 As shown, a supporting structure for the excavation of an auxiliary cavern of a sandy gravel layer tunnel, including a first column 1 and a second column 12 erected on the side walls on both sides of the door of the auxiliary cavern, the first column 1 and the second column 12 Corbels 2 with card slots are arranged on the top, and the two ends of the beam 3 are welded and fixed in the card slots of the corbel 2. The beam 3 passes through multiple supporting piers 4 and multiple arc-shaped I-shaped top arches on the top of the attached cavern. Steel 5 is fixedly connected, and the first column 1 and the second column 12 are respectively fixedly connected with one end of the top arch arc-shaped I-steel 10 of the first column and the arc-shaped I-steel 11 of the second column top arch, forming a rectangular entrance of an attached cavern supporting structure.

[0035] Between the first column 1 and the arc-shaped I-steel 10 at the top of the f...

Embodiment 2

[0041] like image 3 , Figure 4 and Figure 5 As shown, a construction method for excavating an auxiliary cavern of a sand and gravel layer tunnel using the above-mentioned support structure, the method includes the following steps:

[0042] Step 1: Use a high-power excavator to excavate the sand and gravel layer tunnel along the arch line 13, and use steel arches for initial support;

[0043]Step 2: When excavating to the stake number 1 meter from the starting point of the door of the auxiliary cavern, erect the first column 1 on the side wall of the auxiliary cavern, and weld the corbel with a slot on the upper end of the first column 1 2. Use the arc-shaped I-steel 10 of the top arch of the first column for initial support, and the arc-shaped I-steel 10 of the top arch of the first column and the first column 1 are connected by bolts 7 through the connecting plate 6;

[0044] Step 3: Along with the excavation of the gravel layer tunnel, set up a plurality of subsequent ...

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Abstract

An excavation supporting structure of an auxiliary tunnel for a sand gravel layer tunnel comprises a first vertical column and a second vertical column which are erected on side walls on the two sidesof a tunnel portal of the auxiliary tunnel; brackets provided with clamping grooves are arranged on the first vertical column and the second vertical column correspondingly; the two ends of a cross beam are fixed in the clamping grooves of the brackets in a welded mode; the cross beam is fixedly connected with multiple pieces of top arch arc-shaped I-shaped steel on the top of the tunnel througha plurality of supporting pier columns; and the first vertical column and the second vertical column are fixedly connected with one ends of first vertical column top arch arc-shaped I-shaped steel andsecond vertical column top arch arc-shaped I-shaped steel correspondingly, and thus the supporting structure of the rectangular carven door of the auxiliary tunnel is formed. According to the excavation supporting structure of the auxiliary tunnel for the sand gravel layer tunnel and a construction method of the excavation supporting structure of the auxiliary tunnel for the sand gravel layer tunnel, the continuity and safety protection capacity of a primary support for tunnel excavation construction are guaranteed, and safe and efficient excavation construction of the auxiliary tunnel for the sand gravel layer tunnel is achieved.

Description

technical field [0001] The invention relates to the field of excavation and construction of underground caverns, in particular to an excavation support structure and a construction method for an auxiliary cavern of a sandy gravel layer tunnel. Background technique [0002] With the development of water conservancy and hydropower projects, the development of water conservancy and hydropower projects has gradually expanded to the western plateau and canyon basins, and the conditions for dam construction have become more and more complicated, especially in the key construction projects under the opportunity of the western development, with high mountains and deep valleys and deep covering layers , complex geological conditions. In the excavation of many sand and gravel tunnels, especially the tunnel sections with large excavation sections, the stability of the surrounding rock is poor. Due to the increase of the excavation section and free surface at the junction of the sand-g...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02B9/02
CPCE02B9/02Y02E10/20
Inventor 童耀陈廷胜亚森·钠斯尔孟玉成王继柏
Owner GEZHOUBA GROUP FOUND ENG
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