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Ring excavation construction method for underground large-span spherical-cap-shaped dome under weak surrounding rock

A construction method and circular excavation technology, which is applied to underground chambers, earthwork drilling, wellbore lining, etc., can solve the problems of inability to guarantee the safety of excavation construction workers and equipment, difficulty in controlling the quality of spherical crown domes, and surrounding weak surroundings. The problems such as large rock disturbance can be solved, and the effect of shortening the exposure time, saving investment, and avoiding the cost of construction measures can be achieved

Active Publication Date: 2015-12-30
CHINA RAILWAY NO 9 GRP 2ND ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The technical problem to be solved by the present invention is to provide a circular excavation construction method for the large-span spherical crown dome under the weak surrounding rock, which is used to solve the problem of the large-span spherical crown dome under the complex geological conditions of the weak surrounding rock. Conventional construction methods can not guarantee the safety of excavation construction workers and equipment, large disturbance to the surrounding soft surrounding rocks, difficulty in controlling the quality of the spherical crown dome and other technical problems

Method used

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  • Ring excavation construction method for underground large-span spherical-cap-shaped dome under weak surrounding rock
  • Ring excavation construction method for underground large-span spherical-cap-shaped dome under weak surrounding rock
  • Ring excavation construction method for underground large-span spherical-cap-shaped dome under weak surrounding rock

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Embodiment 1

[0086] Embodiment 1: A circular excavation construction method for a spherical crown dome tank cap of a large-span oil storage under weak surrounding rock, comprising the following steps,

[0087] Step 1. Determine the Slope-Span Ratio of the Dome Tank Cap

[0088] The dome tank cap is in the shape of a spherical crown. According to the span of the dome tank cap, adjust the design sag height of the dome tank cap, so that the dome tank cap sag ratio is 1:4.7, ensuring that the dome tank cap is in the best stable state;

[0089] Step 2: From the upper lead hole directly into the bottom of the tank cap to form A section 1

[0090] Directly enter the bottom of the tank cap from the upper lead hole at a distance of 6m from the outer circumference of the tank cap, and extend 3m to both sides on the circular section of the bottom of the tank cap at the same time, forming section A 1;

[0091] Step 3: Excavation support for the first ring of the dome tank cap

[0092] Taking Section...

Embodiment 2

[0111] Embodiment 2: A circular excavation construction method for a spherical crown dome of a large-span underground storage room under weak surrounding rock, comprising the following steps,

[0112] Step 1. Determine the Slope-Span Ratio of the Spherical Crown Dome

[0113] According to the span of the spherical dome, adjust the design height of the dome so that the sag ratio of the spherical dome is 1:4.3 to ensure that the spherical dome is in the best stable state;

[0114] Step 2: Form A section 1 by directly entering the bottom of the spherical crown dome from the upper lead hole

[0115] Directly enter the bottom of the spherical crown dome from the upper entrance hole 6m away from the outer circumference of the dome, and expand 2.5m to both sides on the circular section at the bottom of the dome at the same time, forming section A 1;

[0116] Step 3: Excavation support for the first ring of the spherical crown dome

[0117] With Section A 1 as the starting point and...

Embodiment 3

[0134] Embodiment 3: A circular excavation construction method for the spherical crown dome of the national defense underground large-span machinery storehouse under weak surrounding rocks, including the following steps,

[0135] Step 1. Determine the Slope-Span Ratio of the Spherical Crown Dome

[0136] According to the span of the spherical crown dome, adjust the design sag of the dome tank cap, so that the sag ratio of the spherical crown dome is 1:6.6, and ensure that the spherical crown dome is in the best stable state;

[0137] Step 2: Form A section 1 by directly entering the bottom of the spherical crown dome from the upper lead hole

[0138] Directly enter the bottom of the spherical crown dome from the upper lead hole at a distance of 6m from the outer circumference of the tank cap, and expand 3m to both sides on the circular section at the bottom of the dome at the same time, forming section A 1;

[0139] Step 3: Excavation support for the first ring of the spheric...

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Abstract

The invention discloses a ring excavation construction method for an underground large-span spherical-cap-shaped dome under weak surrounding rock and belongs to the technical field of excavation construction of underground caverns. The method comprises the following six steps: determining the rise-span ratio of the spherical-cap-shaped dome; directly entering the spherical-cap-shaped bottom from an up-leading cavity for forming of a section A; performing first ring excavation support of the spherical-cap-shaped dome; performing next ring excavation support of the spherical-cap-shaped dome; finishing excavation support of a section D in the center of the dome; performing off-wall coating of the spherical-cap-shaped dome. The method is applicable to various surrounding rock geological conditions, has wider application range and a few construction procedures; the scaffold input quantity for coating construction of the spherical-cap-shaped dome is reduced, the construction efficacy is improved, the construction progress is accelerated, the construction cost is saved, the difficult problem about excavation of the underground large-span spherical-cap-shaped dome under complex geological conditions of the weak surrounding rock is solved, personnel and equipment safety during construction operation is guaranteed, disturbance on the peripheral surrounding rock is reduced, and the forming quality of the spherical-cap-shaped dome can be controlled very well.

Description

technical field [0001] The invention belongs to the technical field of excavation construction of underground caverns, and in particular relates to an annular excavation construction method for an underground large-span spherical crown dome under weak surrounding rock. Background technique [0002] With the rapid development of my country's economy, more and more underground projects have entered the planning and construction stage. The large-span spherical crown dome of the underground cavern is a three-dimensional shape, and the design section profile is always changing dynamically, which has high requirements for the control of the section line shape. At present, my country's underground engineering construction methods mainly include full-section method, step method, CD middle partition method, CRD cross middle wall method, double-sided pilot pit method, ring-shaped reserved core soil method, etc. These methods are mostly used in railways, highways, Excavation constructi...

Claims

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Application Information

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IPC IPC(8): E21D13/02E21D11/18E21D11/15E21D11/10
Inventor 孙文志杨大伟董世艳徐世文武建立郭金龙闫晶闫冲
Owner CHINA RAILWAY NO 9 GRP 2ND ENG
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