Cover-excavation semi-inverse construction method for assembly type arch top large-span column-free underground structure

An underground structure and construction method technology, applied in underwater structures, infrastructure engineering, artificial islands, etc., can solve the problems of traffic congestion on the ground road and poor spatial vision, achieve short road occupation time, and realize industrialization promotion. Application, the effect of a wide range of applications

Pending Publication Date: 2019-08-02
CHINA RAILWAY SIYUAN SURVEY & DESIGN GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the deficiencies in the above-mentioned prior art, the object of the present invention is to provide a cover-excavation and semi-reverse construction method for a large-span column-free underground structure with a prefabricated vault, which can effectively solve the problem that the conventional underground prefabricated structure has a poor field of view and Surface excavation caused traffic congestion on the ground

Method used

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  • Cover-excavation semi-inverse construction method for assembly type arch top large-span column-free underground structure
  • Cover-excavation semi-inverse construction method for assembly type arch top large-span column-free underground structure
  • Cover-excavation semi-inverse construction method for assembly type arch top large-span column-free underground structure

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Embodiment 1

[0056] Such as Figure 1-Figure 11 As shown, this embodiment provides a cover-excavation and semi-reverse construction method for a large-span column-free underground structure with a prefabricated vault. Taking the underground two-story single-column double-span structure as an example, it includes the following steps:

[0057] 1) After completing the construction of the two enclosure structures 1, construct the crown beam 2, erect an inner support 3 between the two enclosure structures, and excavate to the bottom of the foundation pit of the arch roof slab, such as figure 1 shown;

[0058] 2) Hoisting the arc-shaped arch prefabricated part 4, completing the assembly between the two arc-shaped arch prefabricated parts 4 and the fixing between the arc-shaped arch prefabricated part 4 and the enclosure structure 1; using the arc-shaped arch prefabricated part 4 is the bottom formwork, and concrete is poured between the arc-shaped arch slab prefabricated parts 4 and the enclosu...

Embodiment 2

[0075] Such as Figure 12-14 As shown, this embodiment provides a connection method between the prefabricated part and the cast-in-place concrete layer, which can be used when the first side wall adopts a laminated structure and the first layer adopts a fully cast-in-place or laminated structure in Embodiment 1. The connection between the prefabricated part of the first side wall and the cast-in-place layer of the first layer or the first cast-in-place layer can also be used when the second side wall adopts a laminated structure, and the second layer adopts a fully cast-in-place or laminated structure The connection of the second side wall prefabricated part 13 and the second floor slab cast-in-place layer or the reinforced concrete cast-in-place layer 38; the connection method to the second side wall prefabricated part 13 and the reinforced concrete cast-in-place layer 38 is now described as an example, The connection method between the second side wall prefabricated part and...

Embodiment 3

[0086] This embodiment provides a method for connecting prefabricated parts to prefabricated parts, which can be used for the connection between the first ply prefabricated part 18 and the first ply prefabricated part 18 when the first ply board adopts a superimposed structure in the first embodiment. Connection, the connection between the second layer prefabricated part and the second layer prefabricated part when the second layer board adopts the superimposed structure; now the two first layer board prefabricated parts 18 The connection method will be described as an example, and the connection method of the two second layer prefabricated parts is the same, and will not be described in detail here.

[0087] Such as Figure 15-18 As shown, this embodiment provides a connection method between two first layer prefabricated parts 18, specifically as follows:

[0088] First, determine the diameter and spacing of the steel bars of the steel bar frames on the two first layer prefa...

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Abstract

The invention belongs to the field of underground engineering construction, and relates to a cover-excavation semi-inverse construction method for an assembly type arch top large-span column-free underground structure. The method comprises the following steps: 1) after an enclosure structure is constructed, erecting an inner support, and excavating to the bottom surface of a foundation pit of an arch top board; 2) completing the construction of a arch top layer board, dismantling the inner support, and backfilling covering soil; 3) excavating the lower edge of the arch top layer board while supporting, erecting two inner supports, constructing a concrete cushion layer and a waterproof layer after excavating to the bottom, completing the construction of a second layer board, and removing the inner supports at the lower part; 4) completing the construction of a second side wall, a middle stand column and a middle longitudinal beam; 5) completing the construction of a first layer board, and removing the remaining inner support; and 6) completing the construction of a first side wall. By adopting the method, the assembly type underground structure is well achieved, the visual effect ofthe building is good, erecting of part of temporary facilities such as an on-site formwork and a scaffold can be omitted by forming a superposed structure through part of a prefabricated piece and acast-in-place layer, and the waterproof performance and the overall stress performance of the assembly type underground structure can be effectively improved.

Description

technical field [0001] The invention belongs to the technical field of underground engineering construction, and in particular relates to a cover-excavation and half-upside down construction method for a large-span column-free underground structure with an assembled vault. Background technique [0002] At present, the underground structure adopts the traditional cast-in-place reinforced concrete structure construction technology, the design process is complicated and the workload is heavy. The on-site construction process requires a large number of multi-skilled labor, the construction environment is poor, the construction process is complicated, the construction speed is slow, and the construction quality is difficult to guarantee. During the construction process, a lot of abandoned construction waste is generated, which wastes resources and pollutes the environment. The construction control of cast-in-place concrete structures is uneven. After the completion of the constr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D29/045
CPCE02D29/04
Inventor 汪国良徐军林付先进朱丹熊朝辉蒋晔周兵王鹏向贤华王华兵
Owner CHINA RAILWAY SIYUAN SURVEY & DESIGN GRP
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