Construction method for jacking arched bridges

A construction method and jacking technology, applied in bridges, bridge maintenance, bridge reinforcement, etc., can solve problems such as jamming and high risk, and achieve high safety, high overall safety, and simple operation

Active Publication Date: 2012-10-03
SHANGHAI JIUJIAN REINFORCEMENT TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

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  • Construction method for jacking arched bridges
  • Construction method for jacking arched bridges
  • Construction method for jacking arched bridges

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Embodiment Construction

[0034] The present invention will be further described below in combination with specific embodiments and accompanying drawings.

[0035] The arch bridge to be lifted is an upper-span pedestrian bridge of a certain expressway, and its structure is an upward-supporting arch bridge. The total length of the bridge is 49.59 meters, the main span is 36.6 meters, the width of the bridge is 5.5 meters, and the load level is highway-II. The upper structure is made of C40 reinforced concrete, the brackets are cast-in-situ, and the two sides of the abutment are equipped with mortar-laying rubble chutes. Now due to insufficient clearance, it needs to be jacked up as a whole, and the jacking height is 1.4 meters.

[0036] Such as figure 1 As shown, the construction scheme design and demonstration and some construction preparations must be carried out before the arch bridge is jacked up.

[0037] 1. Construction scheme design and demonstration

[0038] (1) Calculation of prestressed st...

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PUM

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Abstract

The invention relates to a bridge maintenance and reinforcement technology, particularly to a construction method for jacking arched bridges. The method is characterized by comprising the following steps: firstly, placing and jacking a base; secondly, placing a pallet beam and a stretching prestressed steel strand; thirdly, setting a spacing device; fourthly, entirely jacking; fifthly, performing top-connecting construction; and sixthly, mounting a support, wherein the order of the first, the second and the third steps can be interchangeable. The method has the advantages of simplicity in operation, high safety and definite force transmission; and although the span of arch after jacking is slightly reduced, the integrity of a pier foundation in position after jacking is excellent, and the integral security is higher than that of the original design.

Description

[0001] technical field [0002] The invention relates to a bridge maintenance and reinforcement technology, in particular to a construction method for arch bridge jacking. Background technique [0003] During reconstruction of river courses, highways, and railways, bridges often need to be lifted as a whole due to lack of headroom, and arch bridges are more difficult to lift due to complex forces. Bridge jacking construction must ensure the integrity, safety, and reliability of the original bridge structure, and avoid horizontal deviation, distortion, vibration, impact, etc. Therefore, the synchronization of the jacking displacement and the balance of the force are the keys to the construction control. The key to the jacking construction of arch bridges is to offset the horizontal thrust during the jacking process of arch bridges. In practical applications, three construction schemes are often adopted: (1) Open anchor grooves inside the pier, and pass the prestressed tendon...

Claims

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Application Information

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IPC IPC(8): E01D22/00
Inventor 王海赵殿峰苟金成王海洋张凯
Owner SHANGHAI JIUJIAN REINFORCEMENT TECH
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