Down-lying, bed-contacting and sinking control technologies of super large steel cofferdam

A technology of lowering the cofferdam and super-large steel, which is applied in the direction of construction and infrastructure engineering, etc., can solve the problems of difficult control of super-large steel cofferdams, difficulties in subsidence accuracy, and easy tilting

Inactive Publication Date: 2008-06-25
CHINA MAJOR BRIDGE ENG
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The conventional installation and construction of steel casing cofferdams on bridge caps is generally done when the height difference between the upstream and downstream riverbeds is not large. The process is not easy to control, espe

Method used

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  • Down-lying, bed-contacting and sinking control technologies of super large steel cofferdam
  • Down-lying, bed-contacting and sinking control technologies of super large steel cofferdam
  • Down-lying, bed-contacting and sinking control technologies of super large steel cofferdam

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Embodiment Construction

[0029] When the high tide level of the day is selected, the cofferdam sinking construction operation is carried out. Through the joint action of the lifting system and the horizontal guide device, coupled with the principle of batch sinking and batch water injection in the cofferdam wall warehouse, the cofferdam sinks under control .

[0030] The structure and working mode of the present invention are described in detail below according to the accompanying drawings

[0031] 1. The lifting system is composed of casing top hanging pile 6 and lifting device 7. The pile hanging on the top of the casing is the pile hanging equipment used on the original drilling platform; the lifting device is composed of a distribution beam (i.e. pole beams 10, 13, 15), a jack 12 and a finished rolled threaded steel bar 9. During on-site construction, it can be used on the pole Temporary pads 11 are set between beams 10 and 13 for safety.

[0032] Referring to Figures 4, 5, 6, and 7, in the lift...

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Abstract

The invention discloses a control technology of putting down, touching rocks and settlement of a super cofferdam. The invention belongs to the bridge engineering foundation construction field and is applicable to the cofferdam construction in the bridge high-low pile cap foundation. Namely the invention adopts the control technology of putting down, touching rocks and settlement to realize controllable initiative, adjustable ration, controllable position and adjustable deviation during the settlement of the cofferdam. The technology adopts a uniquely designed lifting system and a horizontal guide device to ensure that the cofferdam is safely and accurately settled to the designed position under the synchronous action of the lifting system and the horizontal guide device and through the wall cabin batch water filling mode as well as under the controllable state that the gravity is greater than the buoyancy. The invention effectively solves the problems of putting down and touching rocks of the super cofferdam as well as the settlement precision in the covering layer under the disadvantageous conditions such as tidal rivers with frequent hydrologic change, bigger riverbed height difference and so on, and improves the installation accuracy of the cofferdam.

Description

technical field [0001] The invention relates to a cofferdam construction method for bridge high and low pile cap foundations, belonging to the technical field of bridge foundation construction. Specifically, after the construction of the bridge pier foundation bored piles is completed, the completed pile steel casing is used as the guide pile, and under the joint action of the lifting system and the horizontal guide device, the super-large steel cofferdam can be used in tidal rivers with frequent changes and the height difference of the river bed is relatively small. Safely and accurately sink to the design position under severe unfavorable conditions. Background technique [0002] Nanjing Dashengguan Yangtze River Bridge is located in the Nanjing section of the lower reaches of the Yangtze River, where the water is deep and the current is fast. In order to build the Nanjing Dashengguan Yangtze River Bridge quickly, with high quality and with hig...

Claims

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Application Information

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IPC IPC(8): E02D19/04
Inventor 秦顺全宋伟俊文武松袁先留刘俊潘军连泽平王东辉何峰程晨董广文李贺牟翔杨海鹏
Owner CHINA MAJOR BRIDGE ENG
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