Construction method suitable for ultra-large fracture surface underground chamber excavating and steel arch frame fixing

A technology for underground chambers and extra-large sections, which is applied in underground chambers, earthwork drilling, wellbore lining, etc. It can solve the problems of high construction costs and large waste of support structure funds, and achieve the effect of speeding up construction progress and saving engineering investment

Active Publication Date: 2019-08-23
国能大渡河猴子岩发电有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The support effect of this scheme is better, but the construction cost is very high, and for areas with better surrounding rock conditions, the support structure of the full-section arch will waste a lot of funds

Method used

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  • Construction method suitable for ultra-large fracture surface underground chamber excavating and steel arch frame fixing
  • Construction method suitable for ultra-large fracture surface underground chamber excavating and steel arch frame fixing
  • Construction method suitable for ultra-large fracture surface underground chamber excavating and steel arch frame fixing

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Embodiment Construction

[0038] Such as Figure 1~4 Among them, a construction method suitable for the excavation of extra-large-section underground chambers and the fixing of steel arches, including the following steps:

[0039] S1, divide the extra-large section underground chamber into at least two layers from top to bottom for excavation;

[0040] In the preferred scheme, the excavation height of the top arch layer is 2.5±0.3m below the intersection of the cavern vault and the side wall.

[0041] In a preferred solution, the installation height of the dome arch 1 extends downward in the vertical direction by 1.5±0.2m in addition to the arc height of the dome.

[0042] S2. Excavation construction of the top arch layer, and a section of the top arch is excavated, and the dome arch frame 1 is installed close to the cave wall;

[0043] S3. After the dome arch 1 is installed for a section, the dome is sprayed with concrete, and longitudinal rock anchor beams 2 are arranged along the chamber side wall...

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Abstract

The invention provides a construction method suitable for ultra-large fracture surface underground chamber excavating and steel arch frame fixing. The construction method comprises the following stepsthat an ultra-large fracture surface underground chamber is excavated through at least two layers from top to bottom; a section of a top arch is excavated, and a dome arch frame is installed closelyattached to the chamber wall; after a section of the dome arch frame is installed, concrete spraying protecting is conducted on the dome, a longitudinal rock anchor beam is arranged along a chamber side wall support of the dome arch frame, the section of the dome arch frame is connected into a whole, and accordingly the whole dome arch frame can be fixed; after dome concrete and rock anchor beam concrete reach the age, lower-layer chamber layer excavation and support construction are synchronously conducted from the firstly-excavated part of the top arch layer; and through the above steps, ultra-large fracture surface underground chamber excavating and steel arch frame fixing construction are achieved. Through layering excavation, the scheme that dome arch frame support is conducted firstly, and then the rock anchor beam is constructed is adopted, stability of the surrounding rock of the dome top arch layer can be ensured, and lower-layer chamber excavation construction safety is ensured. Upper-lower-layer excavation support construction of the chamber can be synchronously arranged and implemented.

Description

technical field [0001] The invention relates to the field of underground chamber excavation construction, in particular to a construction method suitable for excavating an extra-large section underground chamber and fixing a steel arch frame. Background technique [0002] At present, the excavation and support construction of extra-large section underground caverns and underground powerhouses is generally carried out in two or more layers from top to bottom. The support method of steel arch frame plus anchor rod (bundle) and hanging net sprayed concrete is becoming more and more common. [0003] Layered excavation support, how to construct the steel arch has the following technical problems: (1) How to root and bear the force of the steel arch when excavating a layer of steel arch to support the first floor is a problem; Steel arches are implemented, but due to the large span of the cavern and complex surrounding rock conditions, the surrounding rock may be deformed, damage...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D13/02E21D11/18E21D11/10E21D20/00E21D20/02E21D11/22
CPCE21D11/10E21D11/18E21D11/22E21D13/00E21D20/00E21D20/021
Inventor 杨小华张旭费波涛唐珂马作霖李红心杨吉学李世凯杨永乐翟献超
Owner 国能大渡河猴子岩发电有限公司
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