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Construction method of full-section excavation of conglomerate type V surrounding rock diversion and flood discharge scouring tunnel in the western region

A construction method and full-section technology, which is applied in sea area engineering, earthwork drilling, water conservancy engineering, etc., can solve the problems of difficult implementation, lagging progress of manual excavation, and difficult implementation of cemented and slightly dense tunnel sections, so as to achieve the goal of investing manpower The effect of less resources, fast digging progress, and low overall cost

Active Publication Date: 2021-05-04
SINOHYDRO ENG BUREAU 15
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] According to the on-site excavation follow-up inspection, it is found that the progress of manual excavation is seriously lagging behind, and there are certain safety risks; excavation by steps is difficult to implement due to the small excavation section size; backhoe excavation is only suitable for very loosely cemented tunnel sections , it is more difficult to implement the cemented slightly dense tunnel section

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A full-section excavation construction method for diversion and flood discharge scouring tunnels in Type V surrounding rocks of conglomerate in the Western Regions, comprising the following steps:

[0020] (1) According to the size of the excavation section in the design drawings, the laser guide is used to point, and the total station is used to stake out the tunnel face;

[0021] (2) The Western Region Conglomerate Type V surrounding rock in this embodiment is a micro-cemented dense sandy gravel layer, which is excavated at a full section without explosion, with a 0.2m thick protective layer reserved, excavated with an artificial pick, and the circular footage is 1.2m. After digging a circular footage, carry out initial support;

[0022] The initial support includes: a. installation of steel arches; b. hanging net; c. shotcrete.

[0023] a. Installing the steel arch includes the following steps:

[0024] 1) Measurement positioning

[0025] First measure the center ...

Embodiment 2

[0032] In this example, the Type V surrounding rock of conglomerate in the Western Regions is a micro-cemented and dense sandy gravel layer. Explosion-free full-section excavation is adopted, a 0.2m thick protective layer is reserved, and artificial pneumatic picks are excavated. The circular footage is 1m, and one excavation is carried out. After the circular footage, the initial support is carried out, and the distance between two adjacent steel arch frames is 1m. Other construction steps are identical with embodiment 1.

Embodiment 3

[0034] In this example, the Type V surrounding rock of conglomerate in the Western Regions is a micro-cemented and dense sandy gravel layer. Explosion-free full-section excavation is adopted, a 0.2m thick protective layer is reserved, and artificial pneumatic picks are excavated. The circular footage is 1.5m. After a cycle of footage, the initial support is carried out, and the distance between two adjacent steel arch frames is 1.5m. Other construction steps are identical with embodiment 1.

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Abstract

A full-section excavation construction method for diversion and flood-discharge sand tunnels in Type V conglomerate surrounding rocks in the Western Regions. According to the excavation section size in the design drawings, a laser guide is used to point, and a total station is used to stake out the tunnel face; The mechanical short-footage full-face excavation method is used to excavate the conglomerate type V surrounding rock tunnel in the Western Regions. After excavating a circular footage, the initial support is carried out. The invention adopts explosion-free full-section excavation or backhoe full-section excavation for the conglomerate type V surrounding rock in the Western Region, which has the advantages of fast excavation progress, high efficiency, strong applicability, less human resources input, high safety factor, and low comprehensive cost. .

Description

technical field [0001] The invention belongs to the technical field of tunnel excavation methods, and in particular relates to a construction method for full-section excavation of a conglomerate Type V surrounding rock diversion and flood discharge sand scour tunnel in the western regions. Background technique [0002] Xinjiang Nuer Water Conservancy Project consists of main buildings such as roller compacted asphalt concrete core wall dam, left bank diversion and flood discharge and sand washing tunnel, left bank surface hole spillway, left bank power generation water diversion tunnel, and power plant building. [0003] Among them, the diversion and flood discharge sand washing tunnel adopts the combination of the dragon head and the diversion tunnel, and is arranged on the left bank of the river bed. It is composed of the entrance channel section, the gate well section, the gradual section and the cave body section, with a total length of 848m. The main excavation of the t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21D9/00E21D9/04E21D9/10E02B8/06
CPCE02B8/06
Inventor 朱亚雄文军赵锋马强支立力许刚
Owner SINOHYDRO ENG BUREAU 15
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