Construction method of large tube well fixed point precipitation, sealing bottom free concrete and steel sheet pile cofferdam deepwater bearing platform

A technology of back-sealing concrete and steel sheet pile cofferdam, which is applied in the direction of basic structure engineering, erection/assembly of bridges, bridges, etc., can solve the problems of large thickness of back-sealing concrete, difficult construction, and long construction period, so as to reduce construction difficulty and cost, The effect of reducing construction difficulty and improving construction efficiency

Inactive Publication Date: 2013-01-16
中铁二十二局集团第一工程有限公司 +1
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a construction method for fixed-point dewatering of large tube wells, no bottom-sealing concrete, and steel sheet pile cofferdam deep-water caps, so as to solve the problems of large construction difficulty, high cost, and short construction period in the construction method of double-wall steel cofferdams and bottom-sealing concrete. Problems of long length and large thickness of back cover concrete

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  • Construction method of large tube well fixed point precipitation, sealing bottom free concrete and steel sheet pile cofferdam deepwater bearing platform
  • Construction method of large tube well fixed point precipitation, sealing bottom free concrete and steel sheet pile cofferdam deepwater bearing platform

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specific Embodiment approach 1

[0008] Specific implementation mode one: the following combination figure 1 and figure 2 This embodiment will be specifically described. This embodiment includes the following steps: 1. Insert steel sheet piles one by one into the underwater sand layer, and make the adjacent steel sheet piles occlude (the occlusion between the female socket and the male socket between the steel plates) to connect into a A closed cofferdam that is above the water surface, and steel bars are tied on the top of the cofferdam, concrete is poured into the cofferdam 4, and the top of the cofferdam 4 is provided with steel plates 5 upward; 2. A plurality of large tube wells 6 are evenly arranged along the inner circle of the cofferdam , the structure of the large tube well 6 is: the upper part is a steel pipe 7, the lower part is a filter pipe 8, the steel pipe 7 is arranged above the underwater sand layer, and the filter pipe 8 is below the sand layer; Bottom cloth 10, in order to avoid the water...

specific Embodiment

[0009] 1. The newly-built Songhua River Super Bridge of the Harbin-Qiqihar Railway Passenger Dedicated Line is located 50m downstream of the existing Binzhou Line in Harbin, in the main stream of the Songhua River between Daowai District and Songbei District, with a total length of 3065m. The span of the main bridge across the river is 77+3×156.8+77m four-line tied arch continuous beam, located in the main channel of Songhua River, with an average water depth of 10m. Among them, the size of the 39# cap: 24.9m*40.8m*9m, the elevation of the top surface of the cap is 111.7m, there are 40 bored piles under the cap, the diameter of the pile is 2m, and the length of the pile is 87m. The normal water level elevation of the water surface: 116.5m; the river bed elevation is 105.2m.

[0010] 2. The Songhua River is a wide and shallow plain-type channel, a national Class III waterway, with a bending radius of 500m and navigable for 1,000-ton ships. The Songhua River at the bridge site ...

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Abstract

The invention discloses a construction method of large tube well fixed point precipitation, sealing bottom free concrete and a steel sheet pile cofferdam deepwater bearing platform and relates to the construction method of a deepwater bearing platform of a bridge. The construction method aims to solve problems that a double wall steel cofferdam and sealing bottom concrete construction method is large in sealing bottom concrete thickness, large in steel plate pile length and large in construction difficulty. The construction method comprises the following steps of: inserting steel plate piles into a sand layer under water, connecting adjacent steel plate piles in a clamping manner so as to form a cofferdam which is higher than a water level and sealed; uniformly setting a plurality of large tube wells along an inner circle of the cofferdam; pumping out the water from a cofferdam area by using a submersible electric pump; at the same time, connecting the steel tubes or shape steels with steel plate piles which are exposed outside the water level in the horizontal direction so as to form horizontal cofferdam support beam groups, wherein the plurality of horizontal cofferdam support beam groups are arranged in the height direction; after the water in the cofferdam is completely pumped out, an underlayer is paved; and a reinforcement cage for manufacturing the deepwater bearing platform is arranged on the underlayer and concrete is cast so as to form the deepwater bearing platform.

Description

technical field [0001] The invention relates to a construction method for a deep-water bearing platform of a bridge. Background technique [0002] With the development of society, the expansion of transportation demand and the continuous improvement of bridge construction technology, a large number of deep-water long-span bridges across rivers and straits have emerged one after another, and these large bridges are complex in terms of scale, structure, and construction environment. It puts forward high requirements for engineering construction technology. [0003] The main difficulty in the construction of deep water foundations of bridges lies in waterproof and soil-proof measures. The construction of pile foundations and caps often needs to be equipped with waterproof cofferdams. During the construction process, the cofferdam can effectively prevent the water and soil outside the cofferdam from pouring into the cofferdam. These cofferdams can be dismantled after the founda...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E01D21/00E02D27/14E02D27/52E02D19/04E02D19/10
Inventor 王新丰于加顺董启军刘忠新汪新立夏传江马志新马琳琳路亮苗慧韩维东徐春鑫钟宇泽侯爽
Owner 中铁二十二局集团第一工程有限公司
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