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Reconstruction method of long-span tied arch bridge based on bridge hydraulic jacking system

A tie-bar arch bridge and long-span technology, which is applied in the field of bridge jacking construction, can solve the problems of many temporary pads and jacking cycles, short construction period, and high safety risks, so as to achieve easy control of the construction process, simple installation and layout, The effect of smooth lifting process

Active Publication Date: 2021-08-27
NO 1 ENG LIMITED OF CR20G
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, when jacking up the main bridge, there are the following construction problems: First, the project is located on the expressway, and the jacking construction must interrupt the traffic, and change the two-way traffic of the double-width bridge to the two-way traffic of the single-width bridge, which will affect the traffic of the expressway Larger, short road closure time, tight construction period, and the necessary closure time during construction is short, so a construction plan that has little impact on navigation must be adopted; second, the jacking weight of the main bridge is huge, and the single jacking weight is 7,000 tons ;Third, during the jacking process, the upper structure of the bridge is in a suspended state, and there are great potential safety hazards, and effective measures must be taken to resolve the above risks to ensure the safety of the bridge and construction personnel; Fourth, the jacking height is relatively high, and the jacking With a height of 2.16m, there are many temporary pads and jacking cycles, which put forward higher requirements for the overall stability of the supporting structure. It is necessary to ensure that the vertical and horizontal support system is firm, reliable and stable.
Correspondingly, when jacking up the approach bridge, there are the following construction problems: first, the number of spans of the approach bridge is large and the jacking weight is heavy, the risk points are scattered, and the overall jacking construction process is difficult to control; second, during the jacking process, the upper part of the bridge The structure is in a suspended state, and there are great potential safety hazards. Effective measures must be taken to resolve the above risks to ensure the safety of the bridge and construction personnel; third, the jacking height is relatively high, with a jacking height of 2.16m. Temporary pads and jacking There are many cycles, which put forward higher requirements for the overall stability of the supporting structure. It is necessary to ensure that the vertical and horizontal support system is firm, reliable and stable.
[0006] From the above content, it can be known that the jacking construction of the long-span concrete filled steel pipe tied arch bridge across the canal waterway is complicated, difficult, and has high safety risks, and the jacking height is more than 2m, the construction period is short, and the task is heavy. There is no successful experience for reference, and there are few technical materials available for reference

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  • Reconstruction method of long-span tied arch bridge based on bridge hydraulic jacking system
  • Reconstruction method of long-span tied arch bridge based on bridge hydraulic jacking system
  • Reconstruction method of long-span tied arch bridge based on bridge hydraulic jacking system

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Embodiment Construction

[0194] Such as figure 1 The reconstruction method of the long-span tied-arch bridge based on the hydraulic jacking system of the bridge is shown, the bridge to be reconstructed is a long-span concrete-filled steel pipe tied-arch bridge, and the long-span concrete-filled steel pipe tied-arch bridge includes the main bridge and two connected bridges respectively. In the approach bridges on the front and rear sides of the main bridge, the two approach bridges have the same structure; the two approach bridges are respectively the front approach bridge positioned at the front side of the main bridge and the rear approach bridge positioned at the rear side of the main bridge. The main bridge and the two approach bridges are all arranged on the same vertical plane;

[0195] Such as figure 2 , Figure 22 As shown, the main bridge includes the upper structure of the bridge to be lifted and the lower support structure of the bridge to support the upper structure of the bridge to be l...

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Abstract

The invention discloses a reconstruction method for a large-span tied arch bridge based on a bridge hydraulic jacking system. The reconstructed bridge includes a main bridge and two approach bridges; when reconstructing the reconstructed bridge, the steps include: step 1: lifting the bridge And the construction of the new approach bridge: use the bridge hydraulic jacking system to carry out jacking construction on the superstructure of the bridge to be jacked up and the two main beams 1 of the approach bridge to be jacked up; step 2, follow-up construction. The method of the invention is reasonable in design, simple in construction and good in use effect. It is simple and fast to complete the construction process of jacking up the large-span arch bridge, and the jacking process is safe and reliable; in addition, when the original bridge superstructure is jacked up, two new approach bridges are built, which can effectively reduce the backfill workload and save construction. duration.

Description

technical field [0001] The invention belongs to the technical field of bridge jacking construction, and in particular relates to a reconstruction method for a long-span tied arch bridge based on a bridge hydraulic jacking system. Background technique [0002] Bridge jacking construction (also known as bridge jacking technology) refers to the adoption of the overall hydraulic synchronous lifting scheme, that is, using the original cast-in-place piles to bear the load, without destroying the original bridge deck pavement, railings, sidewalks, and beams and slabs. Connections, etc., first use the hydraulic jacking device to withstand the overall structure of the bridge, then cut off the columns under each pier and platform cap beam, and then operate the hydraulic jacking device to raise the bridge as a whole to the design height, and finally connect the long column steel bars Formwork pouring of the second stage concrete. The bridge superstructure refers to the general term fo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E01D4/00E01D22/00
CPCE01D4/00E01D22/00
Inventor 赵罡颉张记军杜越梁之海李金宝朱书洁汪洋严朝锋王永丽
Owner NO 1 ENG LIMITED OF CR20G
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