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Reinforced concrete combined arch bridge spanning karst caves in tunnel and construction method thereof

A technology in tunnels and karst caves, which is applied to arch bridges, bridges, bridge materials, etc., can solve the problems of difficulty in crossing large karst caves, and achieve the effects of convenient and quick installation, reduced construction difficulty, and high strength

Pending Publication Date: 2020-10-30
ROAD & BRIDGE INT +1
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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that it is difficult to cross large karst caves during tunnel construction, and to provide a steel-concrete composite arch bridge structure and construction method that spans karst caves in tunnels, which reduces construction difficulty and improves construction efficiency

Method used

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  • Reinforced concrete combined arch bridge spanning karst caves in tunnel and construction method thereof
  • Reinforced concrete combined arch bridge spanning karst caves in tunnel and construction method thereof
  • Reinforced concrete combined arch bridge spanning karst caves in tunnel and construction method thereof

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Embodiment Construction

[0023] Such as figure 1 , figure 2 , image 3 , Figure 4 As shown, the steel-concrete composite arch bridge spanning the karst cave in the tunnel provided by the present invention includes a plurality of shaped steel arch ribs 1 arranged side by side, and the two ends of each shaped steel arch rib 1 are connected with the abutment 3 poured on the two side walls of the karst cave 2 Fixedly connected, there is a certain distance between adjacent steel arch ribs, and they are connected by a plurality of beams 4, and the support steel plates 5 are laid on the beams 4, and a layer of concrete arch ribs 6 is poured on the top of the support steel plates 5 and the steel arch ribs, and the concrete arch ribs A concrete filling layer 7 is poured on the top of the rib 6 , and the top surface of the concrete filling layer 7 is flush with the bottom surface of the tunnel 8 .

[0024] During the specific implementation of the present invention, the profiled steel arch rib 1 can be for...

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Abstract

The invention provides a reinforced concrete combined arch bridge spanning karst caves in a tunnel and a construction method thereof. The arch bridge comprises a plurality of profile steel arch ribs arranged in parallel. The two ends of each section steel arch rib are fixedly connected with arch supports poured on the two side walls of the karst cave; a certain distance is reserved between every two adjacent profile steel arch ribs, the adjacent profile steel arch ribs are connected through a plurality of cross beams, supporting steel plates are laid on the cross beams, a concrete arch rib ispoured on the tops of the steel plate supports and the profile steel arch ribs, a concrete filling layer is poured on the top of the concrete arch rib, and the top face of the concrete filling layer is flush with the tunnel bottom face. During construction, firstly, profile steel arch rib installation is completed through vertical rotation construction; then the profile steel arch ribs are used asthe support to construct the upper concrete arch ribs, the characteristics that the profile steel arch rib is small in dead weight, high in strength and convenient and fast to install are fully utilized, formwork supports are prevented from being erected under a bridge, and therefore construction difficulty is lowered, construction quality is guaranteed, safety risks are reduced, and constructioncost is reduced.

Description

technical field [0001] The invention belongs to the technical field of tunnel construction, and relates to a steel-concrete composite arch bridge structure and a construction method for crossing a karst cave when a karst cave is encountered during tunnel excavation. Background technique [0002] When karst caves are encountered during tunnel excavation, smaller karst caves are generally treated by backfilling, and larger karst caves can be crossed by bridges. However, for large and deep karst caves, due to the narrow space in the tunnel, it is difficult for large machinery to play a role, and the construction efficiency of bridges in the cave is low; especially for water-passing karst caves, there are still problems such as difficulty in erecting formwork supports under the bridge, and it is difficult to construct bridges in karst caves Big. Contents of the invention [0003] The purpose of the present invention is to solve the problem that it is difficult to cross large ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E01D4/00E01D21/00E01D101/24E01D101/30
CPCE01D4/00E01D21/00E01D2101/24E01D2101/30
Inventor 李玲玉黄灿陈松洲
Owner ROAD & BRIDGE INT
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