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Tunnel inverted-arch structure for preventing floor heaving and construction process

A construction technology and arch structure technology, applied in the direction of tunnels, tunnel linings, shaft equipment, etc., can solve problems such as uneven settlement of tunnels, easy repetition of inverted arch bottom drums, and delays in the construction period, so as to prevent the phenomenon of inverted arch bottom drums and increase The difficulty of operation and the effect of reducing risks

Active Publication Date: 2020-09-08
CHINA RAILWAY 18TH BUREAU GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When tunnels pass through weak strata and high-stress areas with harsh geology, various phenomena such as collapse, water gushing, floor heaving, and large deformation often occur. Inverted arch floor heaving is one of the more common ones. Once the deformation occurs, it is continuous and uncertain. It left a major hidden danger to the project construction and later operation, and seriously damaged the tunnel structure
[0003] There have been many cases of tunnel invert floor heaving at home and abroad. In conclusion, the causes of tunnel invert floor heaving are mainly due to natural environmental factors in the area where the tunnel passes, in addition to human factors (poor construction quality) and natural factors (earthquakes), etc. Caused by, for example, the uneven settlement or overall settlement of the tunnel due to the weak ground, the erosion of the inverted arch by groundwater, the deformation and fragmentation of surrounding rocks, resulting in the expansion of the plastic circle and increasing the load of the inverted arch, etc.
[0004] The inventor believes that: the current inverted arch structure of the tunnel is easily affected by the above-mentioned factors to cause floor heaving, and the construction technology does not have scientific fortifications for the section of the inverted arch floor that is prone to the hole. It only relies on brute force grouting for reinforcement, and the effect obtained is very limited. In addition, the inverted arch bottom drum phenomenon is very easy to repeat, which greatly delays the construction period and increases the construction cost

Method used

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  • Tunnel inverted-arch structure for preventing floor heaving and construction process
  • Tunnel inverted-arch structure for preventing floor heaving and construction process
  • Tunnel inverted-arch structure for preventing floor heaving and construction process

Examples

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Embodiment 1

[0030] Such as Figure 1-2 As shown, the present embodiment provides a tunnel inverted arch structure for preventing bottom drum, including an outer inverted arch steel frame 13, an inner layer inverted arch steel frame 9 and a top layer steel arch frame 3; the outer layer inverted arch steel frame 13 Both are in an inverted arch shape with the inner inverted arch steel frame 9, and the top layer steel arch frame 3 is arranged horizontally, and the tops of the outer layer inverted arch steel frame 13 and the inner layer inverted arch steel frame 9 are respectively fixedly connected with the top layer steel arch frame 3 , the outer inverted arch steel frame 13 is fixedly connected with the inner layer inverted arch steel frame 9;

[0031] A reinforcement cage 4 is arranged between the inner layer inverted arch steel frame 9 and the top layer steel arch frame 3, between the inner layer inverted arch steel frame 9 and the outer layer inverted arch steel frame 13, the inner layer ...

Embodiment 2

[0038] Such as image 3 As shown, the present embodiment provides a construction technique for preventing tunnel invert bottom drum, including the following steps:

[0039] Step 1: Excavate the stratum at the arch wall and the invert, reinforce the weak strata with grouting, and drain the groundwater development section.

[0040] Step 2, leveling the concrete cushion, installing the outer inverted arch steel frame 13, and reinforcing each inverted arch steel frame with anchor rods.

[0041] Step 3, pouring the concrete 12 of the primary support layer of the inverted arch, and laying the outer waterproof layer 11 .

[0042] Step 4, install the arch foot drainage pipe 6;

[0043] Step 5, lay dense steel bars 10 along the axial direction of the tunnel, install the inner inverted arch steel frame 9, pour the inner concrete 8, and lay the inner waterproof layer 7; Welding seams in the area of ​​the steel arch joints are retained on the walls.

[0044]Step 6: Binding steel bars ...

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Abstract

The invention relates to a tunnel inverted-arch structure for preventing floor heaving and a construction process. A main body of the tunnel inverted-arch structure comprises an outer inverted-arch steel frame, an inner inverted-arch steel frame and a top steel arch frame; the construction process mainly comprises the steps that stratums of an arch wall part and an inverted-arch part are excavated, the soft and weak stratum area is poured and reinforced, and drainage of a groundwater development section is conducted; inverted-arch steel frames are installed, and each inverted-arch steel frameis subjected to anchor reinforcement; concrete of an inverted-arch initial support layer is poured, and a waterproof layer is paved; a drainage pipe of an arch foot is installed; a dense steel bar rowis paved in the axial direction of the tunnel, the inner inverted-arch steel frame is installed, inner concrete is poured, and an inner waterproof layer is paved; and an inverted-arch secondary lining steel bar is bound, and secondary lining concrete is poured.

Description

technical field [0001] The disclosure belongs to the technical field of civil engineering construction, and in particular relates to a tunnel inverted arch structure and construction technology for preventing floor drums. Background technique [0002] The inverted arch of the tunnel is a reverse arched structure set at the bottom of the tunnel to improve the stress condition of the upper supporting structure. It is one of the main components of the tunnel structure. It is an important part of the tunnel structure to effectively transmit the load on the road surface to the underground, and to effectively resist the reaction force from the lower layer of the tunnel. When tunnels pass through weak strata and high-stress areas with harsh geology, various phenomena such as collapse, water gushing, floor heaving, and large deformation often occur. Inverted arch floor heaving is one of the more common ones. Once the deformation occurs, it is continuous and uncertain. It left a maj...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D11/10E21D11/15E21D11/18E21D20/02
CPCE21D11/18E21D20/02E21D11/10E21D11/152
Inventor 潘建平薛翊国傅康侯守江柏成浩胡恒千公惠民徐龙坤姚希磊周宗庆王乃勇
Owner CHINA RAILWAY 18TH BUREAU GRP CO LTD