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Post-tensioning method prefabricated concrete supporting component, inner supporting system and construction method

A technology of prefabricated concrete and supporting components, applied in the direction of foundation structure engineering, excavation, building construction, etc., can solve the problems of non-conformity, waste of manpower and material resources, poor anti-deformation ability, etc., to ensure integrity and safety, and to facilitate transportation. and installation, the effect of large anti-deformation ability

Pending Publication Date: 2021-03-16
CHINA RAILWAY SIYUAN SURVEY & DESIGN GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Traditional cast-in-place concrete supports are widely used in underground projects because of their advantages such as high rigidity, good integrity, safety and reliability, but there are also prominent problems and shortcomings: (1) Expensive and high investment: concrete supports are temporary projects, The main body of the station structure is completed, that is, the external transport is broken, and the investment in temporary abandoned projects is high. Generally, underground stations amount to millions, and complex stations amount to tens of millions; (2) Time-consuming and long construction period: concrete support formwork, binding steel bars, pouring Pounding, maintenance, and later demolition, the whole process lasts for several months, which seriously restricts the progress of on-site construction; (3) laborious and difficult: the construction of concrete supports is difficult, and the demolition construction after use will consume a lot of manpower and material resources; (4) ) is not environmentally friendly, and concrete destroys waste residues to pollute the environment, which does not conform to the development direction of green construction, environmental protection and energy saving
[0003] Although the traditional steel pipe support can be recycled and the construction is more convenient, it can only bear the pressure between it and the supporting structure of the foundation pit. The first construction support plays the role of temporarily holding up the assembled support, but it is difficult to ensure the vertical construction accuracy

Method used

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  • Post-tensioning method prefabricated concrete supporting component, inner supporting system and construction method
  • Post-tensioning method prefabricated concrete supporting component, inner supporting system and construction method
  • Post-tensioning method prefabricated concrete supporting component, inner supporting system and construction method

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Experimental program
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Effect test

Embodiment 1

[0069] Such as Figure 3-Figure 6 As shown, this embodiment provides a post-tensioned prefabricated concrete support member 3, which includes a concrete structure and two end steel structures 5 arranged at both ends of the concrete structure in the support direction; Concrete 15 in the hollow part, the concrete 15 is equipped with a steel bar skeleton and a plurality of bellows 25, and the two ends of the steel bar skeleton are respectively connected with the steel structures 5 at both ends; each of the bellows 25 is tensioned. The prestressed longitudinal tendons 13 are poured with cement slurry, and both ends of the prestressed longitudinal tendons 13 protrude from the bellows 25 and are respectively anchored in the steel structures 5 at both ends by anchors 26 . The middle of the prefabricated concrete supporting member of this embodiment adopts a hollow concrete structure, and the two ends adopt the end steel structure 5, which can give full play to the advantages of the t...

Embodiment 2

[0078] Such as figure 1 and figure 2 As shown, the present embodiment provides an internal support system, including an enclosure structure 1, a crown beam 2, a waist beam, and an assembled inner support; the top of the enclosure structure 1 is provided with a crown beam 2, and the enclosure structure 1 is provided with a waist beam, and the assembled inner support is supported between the opposite sides of the waist beam and the opposite sides of the crown beam 2; the assembled inner support is implemented by multiple The post-tensioned precast concrete support members 3 provided in Example 1 are spliced; the crown beam 2 or the waist beam are embedded with embedded parts 4, and the two opposite side walls of the enclosure structure 1 are A vertical adjustment and positioning device 6 for supporting and adjusting the vertical position of the assembled inner support is fixed, and the two ends of the assembled inner support are respectively supported on the vertical adjustmen...

Embodiment 3

[0094] Present embodiment provides a kind of construction method of post-tensioned precast concrete support member 3 that embodiment one provides, comprises the following steps:

[0095] S1, making the end steel structure 5 in the steel structure processing plant;

[0096] S2, binding non-prestressed longitudinal reinforcement 12 and spiral stirrup 14 in prefabricated component processing plant, and non-prestressed longitudinal reinforcement 12 and spiral stirrup 14 spot welding, form steel bar skeleton;

[0097] S3. Transport the end steel structure 5 to the prefabricated component processing plant, weld the non-prestressed longitudinal reinforcement 12 with the inner flange 10 of the end steel structure 5, fix the bellows 25 at the corresponding position in the reinforcement skeleton, reserve The grouting pipe 55 and the grouting pipe are provided with corner angle steel 17 at the corner of the prefabricated component and welded with the trim plate 28 to form a lattice struc...

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Abstract

The invention belongs to the field of underground foundation pit engineering, and particularly relates to a post-tensioning method prefabricated concrete supporting component and a construction method. The post-tensioning method prefabricated concrete supporting component comprises a concrete structure and two end steel structures; the concrete structure comprises concrete with a hollow part penetrating in the supporting direction, a steel reinforcement framework and a plurality of corrugated pipes are arranged in the concrete, and the two ends of the steel reinforcement framework are connected with the two end steel structures respectively; and prestressed longitudinal bars are tensioned in the corrugated pipes, cement paste is poured into the corrugated pipes, and the two ends of each prestressed longitudinal bar extend out of the corresponding corrugated pipe and are anchored in the corresponding end steel structure through anchorage devices. The invention further provides an innersupporting system and the construction method, the adopted fabricated inner support is formed by splicing the post-tensioning method prefabricated concrete supporting components, and the two ends of the fabricated support are supported on vertical adjusting and positioning devices on the two sides respectively and connected with embedded pieces on the two sides. The bearing capacity, deformation resistance, integrity and joint rigidity of the fabricated support can be improved, and vertical accurate construction can further be achieved.

Description

technical field [0001] The invention belongs to the technical field of underground foundation pit engineering, and in particular relates to a post-tensioned prefabricated concrete support member, an internal support system and a construction method. Background technique [0002] Traditional cast-in-place concrete supports are widely used in underground projects because of their advantages such as high rigidity, good integrity, safety and reliability, but there are also prominent problems and shortcomings: (1) Expensive and high investment: concrete supports are temporary projects, The main body of the station structure is completed, that is, the external transport is broken, and the investment in temporary abandoned projects is high. Generally, underground stations amount to millions, and complex stations amount to tens of millions; (2) Time-consuming and long construction period: concrete support formwork, binding steel bars, pouring Pounding, maintenance, and later demolit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D17/04E04G21/12
CPCE02D17/04E04G21/121E02D2300/002E02D2300/0029
Inventor 欧阳冬周兵余行张波张建明李成亮赵晨阳江胜学邰家醉李浩
Owner CHINA RAILWAY SIYUAN SURVEY & DESIGN GRP