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Construction method for pretensioned prestressing concrete simply supported T-beam

A construction method and concrete technology, applied in bridges, construction materials processing, construction, etc., can solve the problems of large tonnage, no research records, large span, etc.

Active Publication Date: 2009-04-08
CHINA RAILWAY NO 2 ENG GRP CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For the prefabricated construction of 50m pre-tensioned beams, the span is large, the tonnage is large, and the construction is difficult. At present, there is no research record of its construction technology and supporting equipment in China, and there is no similar construction technology abroad for reference.

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  • Construction method for pretensioned prestressing concrete simply supported T-beam
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  • Construction method for pretensioned prestressing concrete simply supported T-beam

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Embodiment Construction

[0077] The present invention will be further described in detail below in conjunction with specific embodiments.

[0078] The construction method of 50m / 1200t level pretensioned prestressed concrete simply supported T-beam, its process is as follows figure 1 As shown, its main processes include:

[0079] a. Construction beam pedestal,

[0080] b. Hoist the steel bars of the bridge body into the girder pedestal,

[0081] c. Install PVC pipes, install and initially tension steel strands,

[0082] d. Install the end formwork and diaphragm reinforcement,

[0083] e. Install side forms,

[0084] f. Install panel reinforcement and embedded parts,

[0085] g. The whole pushes and stretches the bent and straight bundled steel strands,

[0086] h. T beam concrete pouring,

[0087]i.T beam formwork demolition, concrete curing,

[0088] j. When the concrete strength of the T-beam reaches 90% of the design strength, after the embedded part of the bender is removed, the bent bundle...

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Abstract

The invention discloses a construction method of a pretensioning prestressed concrete simply-supported T shape beam, belonging to the technical field of bridge construction. The method mainly comprises the steps of: constructing a casting bed, hoisting and installing the reinforcing steel of a bridge body into the casting bed, installing a PVC pipe, installing and pre-stretching a stranded wire, installing an end mould and the reinforcing steel of a diaphragm plate, installing a side mould, installing a panel reinforcing steel and an embedded part, integrally pushing and stretching a bent bunch and the linear beam stranded wire, casting T shape beam concrete, carrying out T shape beam form stripping, carrying out concrete curing, removing a bending device embedded part, then integrally releasing and stretching the bent bunch and the linear beam stranded wire, cutting the beam end stranded wire, sealing the end, inspecting the quality and hoisting and removing the beams and the like. The construction method is suitable for making 50m / 1200t level prestressed concrete beams, and can guarantee the safety, efficiency and economical efficiency of construction in large span and large-tonnage.

Description

technical field [0001] The invention relates to a construction method for a prestressed concrete structure of a girder bridge project, belonging to the technical field of girder bridge prefabrication. Background technique [0002] At present, the prefabricated beam construction schemes used in China generally fall into the following two categories: the first category is the construction scheme using the post-tensioning method, that is, the prefabricated pedestal of the T-beam is built, and steel bars are installed on the pedestal, and prestressed steel strands are installed in reserved channels in the beam body. Install the anchorage and backing plate at the end of the beam, then install the formwork and pour concrete. When the concrete of the beam body reaches a certain strength, the tensioning operation is carried out. After prestressing the beam body, the pipe grouting and end sealing are carried out ; Although the post-tensioning method reduces the engineering amount of ...

Claims

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Application Information

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IPC IPC(8): E01D2/00E04G21/12
Inventor 彭溢黄东龙明华李友明秦嘉钱纪民兰文峰朱家稳杨晓辉罗飚王国炜
Owner CHINA RAILWAY NO 2 ENG GRP CO LTD
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