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Combined cofferdam structure and underwater work platform

A combined cofferdam technology, applied in foundation structure engineering, water filling, sheet pile walls, etc., can solve problems such as poor integrity of steel sheet pile cofferdam technology, small horizontal load, and failure to meet environmental protection requirements

Pending Publication Date: 2018-12-21
HAIWEI ENG CONSTR CO LTD OF FIRSTHIGHWAY ENG CO LTD OF CCCC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Common cofferdam forms mainly include steel sheet pile cofferdam, concrete cofferdam, steel casing cofferdam, steel hanging box cofferdam, reinforced concrete composite cofferdam, etc. Among them, steel sheet pile cofferdam has fast construction speed, good economic benefits, and Due to its many advantages such as reuse, it is widely used. However, the integrity of the conventional steel sheet pile cofferdam is poor, and the horizontal load it bears is small. It only relies on the cofferdam structure itself to resist the external water pressure, and it is necessary to set up purlins and multiple lateral supports, etc. The internal space of the cofferdam is limited, which is not conducive to construction operations, and the depth of the steel sheet piles is relatively large
[0005] The underwater island building process has strong integrity, good stability, and can withstand large loads, but it has no external support structure, which is easy to cause river pollution and does not meet environmental protection requirements

Method used

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  • Combined cofferdam structure and underwater work platform
  • Combined cofferdam structure and underwater work platform
  • Combined cofferdam structure and underwater work platform

Examples

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Embodiment

[0033] Please refer to figure 1 , the present embodiment provides a combined cofferdam structure 100, which is used for entering the waters of the embankment 130. The combined cofferdam structure 100 includes a steel sheet pile cofferdam 110 in a semi-enclosed structure, and the gap between the steel sheet pile cofferdam 110 and the embankment 130 is A closed space 120 is formed by enclosing the spaces, and the closed space 120 is filled with materials for building islands.

[0034] Island building, also known as island building core filling, refers to filling soil, sand and gravel in the area surrounded by cofferdams. For example, sandy soil can be used as the material for island construction. The soil with a lot of viscosity has a small amount of settlement when it is used as a foundation, and it is easy to compact. After compaction, it has good water stability and high strength.

[0035] Optionally, the enclosed space 120 is a quadrangular enclosed space, or may also be a ...

specific Embodiment approach

[0041] The specific embodiment of combined cofferdam structure 100 comprises the following steps:

[0042] S1: Stake out of Tsukishima sideline, such as Figure 4 As shown, according to the coordinates of the foundation design, combined with factors such as the location of the steel trestle 140 on site, determine the borderline of the island, which should exceed the design borderline of the cap by no less than 3m. Make a mark.

[0043] S2: Inserting and driving positioning piles. Firstly, combined with the actual hydrogeological conditions, using midas software to model, simulate the stress of the steel sheet pile 111, and obtain its theoretical depth into the soil, that is, the design elevation.

[0044] Further, mark the corresponding position of the steel sheet pile 111 pile body, that is, the design elevation, and then use the crawler crane 150 to lift the steel sheet pile 111. Preferably, a steel wire rope 114 is tied at the lower end of the steel sheet pile 111 to prevent...

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Abstract

The invention provides a combined cofferdam structure and an underwater work platform, and relates to the technical field of underwater foundation construction. The combined cofferdam structure and the underwater work platform are used in water areas close to banks. The combined cofferdam structure comprises a steel sheet pile cofferdam of a semi-enclosing structure. An enclosed space is formed between the steel sheet pile cofferdam and a bank and is filled with island building materials. According to the combined cofferdam structure, the steel sheet pile cofferdam is combined with a built island to form a work platform similar to a land work platform, so that foundation construction is facilitated, and the construction speed is increased; steel sheet piles are driven around the built island, so that pollution to rivers is effectively avoided; and the soil and water pressures on the inner side and outer side of the steel sheet piles are kept approximately balanced, so that extra supporting is not needed anymore, the problem of a narrow operation space caused by arrangement of internal support pieces of a conventional steel sheet pile cofferdam is solved, and materials are saved.

Description

technical field [0001] The invention relates to the technical field of underwater foundation construction, in particular to a combined cofferdam structure and an underwater operation platform. Background technique [0002] Cofferdam refers to the temporary enclosure structure built for the construction of permanent water conservancy facilities in the construction of water conservancy projects. , build buildings. Generally, it is mainly used in hydraulic construction. Except as a part of the formal building, the cofferdam is generally removed after use, and the height of the cofferdam is higher than the highest water level that may occur during the construction period. [0003] In the construction of bridge foundation, when the bridge pier column and cap foundation are below the surface water level, cofferdams can be used as temporary structures. The functions of cofferdams can not only waterproof and enclose water, but also support the pit wall of the foundation pit. [00...

Claims

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Application Information

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IPC IPC(8): E02D19/04E02D5/04E02D5/08E02B3/18
CPCE02B3/18E02D5/04E02D5/08E02D19/04
Inventor 欧阳金平郭云杰王国军任瑞永王利鹏柳鑫
Owner HAIWEI ENG CONSTR CO LTD OF FIRSTHIGHWAY ENG CO LTD OF CCCC
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