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Construction method of double-wall steel cofferdam divided into blocks

A double-walled steel cofferdam and construction method technology, which is applied in basic structure engineering, construction and other directions, can solve the problems of complex pebble covering layer geology, unrealizable construction plan, difficult foundation pit excavation protection, etc., and achieves strong adjustability. , The effect of reducing the amount of excavation works and shortening the construction period

Active Publication Date: 2019-02-12
CHINA RAILWAY CONSTR BRIDGE ENG BUREAU GRP 1ST ENG
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Problems solved by technology

[0002] During the construction of the steel cofferdam, if the pebble overlay is encountered, due to the complex geology of the pebble overlay and the extremely poor self-stability, it is difficult to protect the excavation of the foundation pit before the cofferdam is lowered, and it is difficult to achieve large excavation. The construction scheme of lowering the weir as a whole or lowering some pre-assembled sections cannot be realized

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  • Construction method of double-wall steel cofferdam divided into blocks
  • Construction method of double-wall steel cofferdam divided into blocks
  • Construction method of double-wall steel cofferdam divided into blocks

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Embodiment Construction

[0014] Specific embodiments of the present invention will be described below with reference to the accompanying drawings. like Figure 1 to Figure 4 Shown: A construction method for double-walled steel cofferdams to be lowered into blocks is carried out according to the following steps: firstly, the construction of island building and filling is carried out, that is, after the site is leveled, measurement and stakeout are carried out to determine the excavation line of the foundation pit, and at the same time, the excavation opening is determined. Personnel, machinery and equipment are in place;

[0015] Then, the steel cofferdam foundation pit is cut and excavated, and the excavation point is determined according to the actual situation of the site and the excavation is started. The excavation depth is strictly controlled in accordance with the designed base elevation, and the excavation length is determined by the length of the first steel cofferdam unit block, which can me...

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Abstract

The invention discloses a dual-wall steel cofferdam blocking lowering construction method. The dual-wall steel cofferdam blocking lowering construction method is characterized by comprising the steps that firstly, an island building cofferdam is constructed, a steel cofferdam foundation pit is excavated in a slotting manner, after a base is leveled, a first steel cofferdam unit block is lifted into the foundation pit, and is temporarily supported and reinforced, adjacent unit blocks are excavated in a slotting manner, adjacent steel cofferdam unit blocks are lifted into the foundation pit, the first steel cofferdam unit block and the second steel cofferdam unit block are welded and fixed, after four to five unit blocks are lowered, the multiple unit blocks which are welded into a whole are subject to bay concrete casting, operation is carried out until splicing of the first joint of steel cofferdam is finished, after the first joint of steel cofferdam is spliced into the whole, checking is carried out, after checking is qualified, and height addition welding work of the second joint of steel cofferdam is carried out until the steel cofferdam is heightened to the design elevation.

Description

technical field [0001] The invention relates to the field of bridge deep-water foundation steel cofferdam construction, in particular to a construction method for lowering a double-wall steel cofferdam in blocks. Background technique [0002] During the construction of the steel cofferdam, if the pebble covering layer is encountered, due to the complex geology of the pebble covering layer and the extremely poor self-stability, it is difficult to protect the foundation pit before the cofferdam is lowered, and it is difficult to realize large excavation. The construction plan of lowering the weir as a whole or pre-assembling some segments and then lowering it cannot be realized. Therefore, there is a need for a method that can solve the above problems. SUMMARY OF THE INVENTION [0003] In order to solve the above-mentioned deficiencies in the prior art, the present invention proposes a decomposed cofferdam integral structure, which rationally utilizes the flexible and conve...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02D19/04
CPCE02D19/04E02D2250/0061E02D2250/0069
Inventor 高明慧张久超曹绍渤孙长志张广涛刘长海高学文
Owner CHINA RAILWAY CONSTR BRIDGE ENG BUREAU GRP 1ST ENG
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