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Asynchronous sinking construction method of separated steel cofferdam of large-scale bridge base

A technology of bridge foundation and construction method, which is applied in basic structure engineering, caisson, construction, etc., can solve the problems of low mud suction efficiency, excessive earth pressure deviation, tearing of weld seams, etc. Bit accuracy, safe sinking effect

Active Publication Date: 2011-06-01
SICHUAN ROAD & BRIDGE GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problems of this steel cofferdam sinking construction method are: 1. The ratio of length to width is large, and the stress on the wall of the tie beam part is very large during the sinking process, which may easily cause local weld tearing; and the air in the middle tie beam section The steel pipe of the water jet suction dredger is not well arranged, and the mud suction efficiency is low
The existing problems are: 1. The two separate steel cofferdams sinking synchronously will easily cause excessive deviation of the upstream and downstream earth pressure of the steel cofferdam during the sinking process of the mud suction, and it is difficult to control the sinking accuracy of the steel cofferdam improve
2. During the sinking of the two steel cofferdams, the regional water flow formed turbulent flow, which made the final implantation accuracy of the steel cofferdams poor and increased the construction difficulty of the steel cofferdam sinking

Method used

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  • Asynchronous sinking construction method of separated steel cofferdam of large-scale bridge base
  • Asynchronous sinking construction method of separated steel cofferdam of large-scale bridge base
  • Asynchronous sinking construction method of separated steel cofferdam of large-scale bridge base

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Embodiment 1

[0026] The subsidence of the extra-large separated double-wall steel cofferdam of the No. 28 main pier of the Jingyue Yangtze River Bridge. Jingyue Yangtze River Bridge is a steel box girder twin-tower cable-stayed bridge with a main span of 816m. The north cable tower (main pier No. 28) is located on the bank of the Yangtze river bed and is designed as a separate circular steel cofferdam pile cap foundation. The diameter of the platform cap reaches 30m, and the outer diameter of the steel cofferdam is 33m.

[0027] like Figure 1-6 As shown, the large-scale bridge foundation separation type steel cofferdam asynchronous sinking construction method of the present invention first sinks the downstream steel cofferdam 1 and then sinks the upstream steel cofferdam 2. , The inner side positioning guide device 7 and the outer side positioning guide device 17 are arranged on the outer side. In this way, the interference of turbulent flow between the two steel cofferdams 1 and 2 can ...

Embodiment 2

[0042] like Figure 1-6 As shown, in the asynchronous subsidence construction method of a large bridge foundation separated steel cofferdam of the present invention, except that the angle α between the first I-beam 12 and the second I-beam 13 of the inner positioning guide device 7 is 30° , all the other are identical with embodiment 1.

Embodiment 3

[0044] like Figure 1-6 As shown, in the large bridge foundation separation type steel cofferdam asynchronous sinking construction method of the present invention, except that the angle α between the first I-beam 12 and the second I-beam 13 of the inner positioning guide device 7 is 90° , all the other are identical with embodiment 1.

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Abstract

The invention belongs to the technical field of cofferdams of bridge bases, in particular to an asynchronous sinking construction method of a separated steel cofferdam of a large-scale bridge base. The asynchronous sinking construction method of the separated steel cofferdam of the large-scale bridge base comprises the following steps of: firstly, sinking a downstream steel cofferdam; then sinking an upstream steel cofferdam; and arranging an inner side positioning guide device and an outer side positioning guide device inside and outside the upstream steel cofferdam and the downstream steel cofferdam. The asynchronous sinking construction method of the separated steel cofferdam of the large-scale bridge base has simple, convenient and reliable construction, greatly improves sinking in-place accuracy of the separated steel coffer and enables the construction of the large-scale bridge base to feasibly adopt the sinking of the separated steel cofferdam.

Description

Technical field: [0001] The invention belongs to the technical field of bridge foundation cofferdams, and in particular relates to a construction method for asynchronous subsidence of large bridge foundation separated steel cofferdams. Background technique: [0002] The deep-water foundations of large bridge piers at home and abroad are generally designed as independent foundations, and a single steel cofferdam is used to construct the pier foundation. However, as the span of the bridge continues to increase, the width of the bridge gradually widens. If a single foundation is used for the foundation of the same pier, it will not be able to meet the design requirements of the superstructure. This will inevitably design the pier as a separate foundation. According to the literature, the size of the steel cofferdam used for the foundation construction of the existing bridge with separate foundation is generally small, and the steel cofferdam is sunk by the overall sinking const...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02D23/08E02D19/04
Inventor 聂东于志兵张佐安裴宾嘉杨定军徐国挺姚德波罗华平甘洪冯强林曹瑞冯川罗洋
Owner SICHUAN ROAD & BRIDGE GRP
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