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Method for ceaselessly conducting cast-in-place box girder reset and support replacement

A technology of bearings and box girders, applied in bridges, bridge parts, bridge maintenance, etc., can solve problems affecting the production and operation of surrounding units, eccentric pressure on pier tops, and beams that cannot be reset, so as to eliminate potential safety hazards and save construction Effects of cost and shortening the construction period

Inactive Publication Date: 2019-04-16
NO 6 ENG CO LTD OF CCCC FIRST HIGHWAY ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this construction method, on the one hand, may affect the inability of the beam to be reset, resulting in eccentric pressure on the top of the pier; in addition, the entire construction process requires interruption of traffic for maintenance, which also affects the normal production and operation of surrounding units; and there is a high construction cost. , the defect of long construction period

Method used

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  • Method for ceaselessly conducting cast-in-place box girder reset and support replacement
  • Method for ceaselessly conducting cast-in-place box girder reset and support replacement

Examples

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Embodiment 1

[0033] A bridge maintenance project, the bridge is 1209.46m long and 26.5m wide, the main bridge is a variable cross-section prestressed concrete continuous box girder, and the east-west approach bridge is a cast-in-place prestressed concrete continuous box girder with a beam height of 1.8m and a single box with five rooms.

[0034] The first (4×32.7) m and second (3×32.7) m of the west approach bridge of the bridge displaced 8.2 cm and 4.6 cm toward the abutment respectively, resulting in the failure of multiple support bolts of the two box girders and the limit Lateral shedding, pier column eccentric compression, there are potential safety hazards.

[0035] The method for resetting the cast-in-place box girder and replacing the support by adopting the continuous delivery described in this embodiment includes the following steps:

[0036] (1) Set up double-row floor-to-ceiling scaffolds around the pier columns. The scaffolding adopts fastener-type steel pipe scaffolding; Bac...

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Abstract

The invention belongs to the technical field of bridge maintenance, and particularly relates to a construction method for completing the cast-in-place box girder body reset and support replacement without interrupting the traffic. By means of the method for ceaselessly conducting cast-in-place box girder reset and support replacement, control is realized through a synchronous control system and anejecting and pushing device, girder body reset and support replacement are conducted, repairing and support replacement can be directly conducted at the to-be-repaired girder body position, there isno need to interrupt the traffic in the construction period, the daily use of a box girder cannot be hindered, the normal production and life of the surrounding area are not influenced, the whole construction cycle is short, the construction period can be effectively shortened, and the construction cost is saved; meanwhile, by means of the construction method, the girder body reset can be realized, the eccentric compression problem of pier studs is effectively solved, the potential safety hazards are thoroughly eliminated, and the method is suitable for large-scale popularization.

Description

technical field [0001] The invention belongs to the technical field of bridge maintenance, and in particular relates to a construction method for resetting the girder body of a cast-in-place box girder and replacing a support without interrupting traffic. Background technique [0002] With the development of my country's economy, bridge construction has entered a stage of comprehensive development. The box girder is a common beam structure in bridge engineering. The inside of the box girder is hollow, and there are flanges on both sides of the upper part. It is named for its similar box structure. In bridge construction, box girders of reinforced concrete structure are divided into prefabricated box girders and cast-in-place box girders. Among them, cast-in-place box girders are mostly used in the construction of large continuous bridges. The construction process is: support foundation construction-bracket installation-bottom formwork installation-bracket Preloading - prelo...

Claims

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Application Information

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IPC IPC(8): E01D22/00E01D19/04
CPCE01D19/04E01D22/00
Inventor 王常松李坤芬李红卫
Owner NO 6 ENG CO LTD OF CCCC FIRST HIGHWAY ENG
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