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Open caisson foundation and construction method

A construction method and caisson technology, applied in the direction of foundation structure engineering, construction, etc., can solve the problems of low stiffness of pile foundation, requirements of construction site, and difficult construction in deep water areas, etc., and achieve strong vertical bearing capacity and anti-push The effect of high stiffness

Pending Publication Date: 2018-11-06
POWERCHINA ZHONGNAN ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The pile foundation is a foundation form in which a group of pile foundations are combined by a cap. The advantage is that the construction technology is relatively mature, the cost is low, and the settlement is better controlled. However, due to the small rigidity of the pile foundation itself, there are requirements for the construction site. Construction in deep water areas is more difficult

Method used

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  • Open caisson foundation and construction method

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Embodiment 1

[0041] The "combined caisson foundation and construction technology in deep soft soil foundation" of the present invention is used in deep soft soil foundation. see Figure 1~3 , is a schematic diagram of the foundation of the caisson of the present invention, including a shaft 2, the bottom of which is sealed by a back-sealing concrete 5, and the top of the back-sealing concrete 5 is provided with a cap 4 fixedly connected to the inner wall of the shaft; it also includes vertically distributed concrete Pile foundation 6, the concrete pile foundation 6 is integrally connected with the bearing platform 4 after passing through the back-sealing concrete 5, the bottom-sealing concrete 5 is provided with a hole for the concrete pile foundation 6 to pass through, and the concrete pile foundation 6 is matched with the corresponding hole . The caisson structure 8 is composed of the top cover shaft, the middle partition wall, the bearing platform, the bottom sealing concrete, and the ...

Embodiment 2

[0053] The foundation structure of the caisson in this embodiment is the same as in Embodiment 1, but the construction method is different, specifically: the construction of the concrete pile foundation is preceded by the sinking of the caisson, and after the caisson is in place, the bottom concrete is poured continuously at one time 5 , Cap 4, core-filled concrete 7, to realize the firm connection between the caisson structure 8 and the concrete pile foundation 6. Such as Figure 5 As shown, the specific construction process steps are:

[0054] (a) Punching construction of the concrete pile foundation 6 at the bottom of the caisson, and pouring the concrete pile foundation 6;

[0055] (b) Arrange the vacuum deep well pump well point pipes outside the caisson, carry out pre-dewatering work in advance, and perform compaction grouting on the reinforcement area at the bottom of the caisson;

[0056] (c) The excavation of the foundation pit of the caisson to the lifting elevatio...

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Abstract

The invention relates to an open caisson foundation and a construction method. The open caisson foundation comprises a shaft and vertically-distributed concrete pile foundations. The bottom of the shaft is sealed through bottom sealing concrete, and the top of the bottom sealing concrete is provided with a bearing table fixedly connected with the inner wall of the shaft. The concrete pile foundations are integrally connected with the bearing table after penetrating the bottom sealing concrete. The bottom sealing concrete is provided with holes for the concrete pile foundations to penetrate, and the concrete pile foundations are in clearance fit with the corresponding holes. The open caisson foundation is clear in stress, the concrete pile foundations arranged at the bottom of an open caisson are used for solving the problem that the foundation bearing force is insufficient, the open caisson and the concrete pile foundations have the beneficial effect of mutual supplementing, all foundation dead loads are transmitted to a foundation, the open caisson bottom frictional resistance action is brought into play to the maximum degree, and the structure horizontal thrust exerted on the tops of the concrete pile foundations is obviously reduced.

Description

technical field [0001] The invention relates to a caisson foundation and a construction method, in particular to a combined caisson foundation and a construction method. Background technique [0002] The caisson structure is an empty or multi-chamber well box structure, which is generally composed of blade feet, well walls, partition walls, well holes, grooves, jet tube groups and detection pipes, bottom cover concrete, and top cover. It is a kind of bridge foundation in which the bottom concrete, core concrete and top cover are constructed by digging soil in the caisson and sinking to reach the design elevation due to self-weight. The caisson structure can transmit the upper load to the foundation. It has the advantages of large buried depth, good integrity and good stability. It can not only bear large vertical and horizontal loads, but also can be used as a soil and water retaining enclosure during construction. Weir structure, but the construction period of caisson foun...

Claims

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Application Information

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IPC IPC(8): E02D27/20E02D27/32
CPCE02D27/20E02D27/32E02D2250/0023
Inventor 侯嘉庆王宏贵刘雪松黄列夫
Owner POWERCHINA ZHONGNAN ENG
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