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Air curtain sunk shaft foundation and construction method thereof

A foundation construction and air curtain technology, applied in the direction of foundation structure engineering, caissons, buildings, etc., can solve the problems of cumbersome auxiliary work, poor rectification effect of sinking, and caisson loses the best rectification state, so as to ensure normal use Effect

Active Publication Date: 2007-11-28
CHINA RAILWAY MAJOR BRIDGE ENG GRP CO LTD
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Problems solved by technology

Although the correction effect of the above deviation correction method is acceptable, there are the following problems to varying degrees. Among them, after the partial suction or partial soil removal method is completed, the situation of removing soil and retaining soil at the foot of the counter blade can only be known after being verified underwater by divers ; The bias weight method needs to set a strong horizontal beam and bias weight on the top of the caisson to form a larger correcting moment, and the auxiliary work is more cumbersome
The method of adding horizontal force usually adopts steel wire rope and pulley block. As the caisson sinks, the steel wire rope is tightened, and the caisson has a good deviation correction effect. After the height is high, even if the wire rope is tightened to the preset tension, the effect of sinking deviation correction is not significant

Method used

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  • Air curtain sunk shaft foundation and construction method thereof
  • Air curtain sunk shaft foundation and construction method thereof
  • Air curtain sunk shaft foundation and construction method thereof

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Embodiment Construction

[0046] Referring to accompanying drawing 1, the air curtain caisson and the common caisson are identical in shape and structure, and are formed by pouring concrete such as the side wall of the caisson (4) and the middle partition wall (10). To form an air curtain, a compressed air system is added to the caisson structure. The compressed air system determines the effect of the air curtain. It is composed of a compressed air fan (1), an air bag (2), and a ground air pipeline (3), It consists of pre-buried pipes (5) and (6) in the wall, an air niche (7), and a φ1mm jet hole (8) in the air niche.

[0047] Comparing with accompanying drawing 2, in order to reduce concrete consumption and lighten self-weight of air curtain caisson, hollow cavity (9) is set on caisson bottom section side wall (4), and wall thickness is appropriately reduced.

[0048] With reference to accompanying drawing 3, the air curtain caisson is different according to the frictional resistance of the surroundin...

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Abstract

The invention relates to a foundation for air curtain caisson and the construction method, belonging to the bridge foundation construction technology field. Air curtain caisson makes use of pipes pre-buried in caisson wall and air shrine on external wall to apply high-pressure air to peripheral circumstance so that frictional resistance between caisson wall and soil is decreased and the caisson sinks smoothly. The construction method for foundation of air curtain caisson comprises casting caisson in segment and in place, sucking mud and sinking, height addition, air curtain sinking, caisson absorbing mud and sinking, caisson rectification technology, clearing foundation, and closing bottom so on. The invention is suitable for construction of caisson foundation with all kinds of usage, especially sand formation and clayey stratum with certain water content. The construction method for foundation of air curtain caisson can be used on bank and on water. It can not be constrained by water depth.

Description

technical field [0001] The invention relates to an air curtain caisson foundation and a construction method thereof, belonging to the technical field of bridge foundation construction. [0002] The air curtain caisson is to apply high-pressure air to the surroundings by using the pipelines pre-buried in the well wall and the air niche on the outer wall to reduce the friction between the well wall and the soil and make the caisson sink smoothly. The air curtain caisson foundation construction method is suitable for caisson foundation construction for various purposes, especially for sandy soil and cohesive soil layers with relatively high groundwater levels. The construction method of the air curtain caisson foundation can be on the shore or on the water, and is not limited by the water depth. Background technique [0003] In soft soil foundations such as sandy soil and cohesive soil layer, caisson is a safe and reliable structure to improve the bearing capacity of the found...

Claims

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Application Information

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IPC IPC(8): E02D27/18E02D23/14E02D27/52
Inventor 罗瑞华农代培沈庆龙陈卫成辛斌杨柳青童林鸿李丽华王立忠马涛万方陶履元薛富华李家咸王启愚赵煜澄
Owner CHINA RAILWAY MAJOR BRIDGE ENG GRP CO LTD
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