Bottom sealing method of high pile cap steel suspension box applied to long-period wave surge conditions
A high-pile cap and long-period technology, applied in caissons, buildings, bridge construction, etc., to solve the effect of water seepage and corrosion of steel bars
Active Publication Date: 2021-03-23
CHINA COMM 2ND NAVIGATIONAL BUREAU 2ND ENG
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Problems solved by technology
[0003] The purpose of the present invention is to provide a method for sealing the bottom of a high-pile cap steel hanging box under the condition of long-period wave surges, which can be applied to deep sea and ocean without shelter, and can resist repeated impacts of horizontal and vertical forces of surges , which solves the problems of safety, durability and water leakage of the back cover concrete structure
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Embodiment 1
[0038] Embodiment 1 is applied to the high pile cap construction case of the China-Maldives Friendship Bridge in the Indian Ocean. The China-Maldives Friendship Bridge is the first sea-crossing bridge in the Indian Ocean, connecting the capital of Maldives and the airport island. The main bridge is a five-span V-shaped pier rigid frame bridge with a total length of 760m. The main piers 19#~23# are located in the deep sea area, using high-pile cap foundations, taking the 21# middle pier as an example, the cap is a 7-pile shuttle structure, the thickness is 5m, the bottom elevation of the cap is -3.0m, and the maximum pile length is 104m , the cantilever height above the seabed is 40m, the normal water level is +0m, the water level change caused by the tide is about 1m, the design maximum flow velocity is 1.5m / s, the most unfavorable swell period exceeds 14s, the maximum wavelength is 50m, and the maximum wave height is 4m. The wave height in the window period is about 1-1.5m. l...
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The invention discloses a high pile bearing platform steel hanging box bottom seal method applied to long-period wave surge conditions. The method comprises the following steps that firstly, verticalsupporting rods are welded to a steel bottom plate of a hanging box, various steel pile casings are welded through upper-layer transverse joints, and blockage of gaps of the underwater steel pile casings and the bottom plate of the hanging box is finished; secondly, first-layer underwater bottom seal is conducted, and a water pump conducts forced discharging till the dry construction condition; thirdly, lower-layer transverse joints are welded between the steel pile casings for support within the secondary dry bottom seal height, and the vertical supporting rods are welded to the lower-layer transverse joints from the upper-layer transverse joints through conversion; fourthly, steel bars are arranged in the secondary dry bottom seal range, and after pull press rod conversion and shear pinwelding are conducted on the peripheries of the steel pile casings, dry pouring is conducted, and a second-layer strengthened bottom plate is formed; and fifthly, the upper-layer transverse joints aredismounted, the steel pile casings and the vertical supporting rods at the upper portion are cut way, and bearing platform construction is conducted. By means of the high pile bearing platform steelhanging box bottom seal method, repeated impacts from horizontal acting force and vertical acting force of long-term wave surges can be resisted, and the problems about bottom seal coagulated body safety, durability and water leakage are solved.
Description
technical field [0001] The invention belongs to the field of bridge engineering construction in deep sea and ocean without shelter. More specifically, the present invention relates to an underwater bottom sealing method for a high pile cap steel suspension box in a harsh marine construction environment. Background technique [0002] The high-pile underwater cap adopts the steel hanging box technology to realize dry construction, and the quality of the underwater concrete back cover of the steel hanging box determines the success or failure of the cap platform construction. In domestic waters without swells, the underwater bottom sealing of steel hanging boxes is a mature technology; however, under continuous strong swell sea conditions, it is extremely difficult to seal the bottom of the hanging boxes, and various problems may occur, resulting in the failure of the bottom sealing. The conventional underwater bottom sealing method of the steel hanging box is as follows: 1) P...
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IPC IPC(8): E01D21/00E02D23/00E02D27/52
CPCE01D21/00E02D23/00E02D27/52
Inventor 李宁林树奎肖文福游新鹏程多云李洪军王超汪磊周忠胜王振万猛陈橙郗永磊赵冬晓
Owner CHINA COMM 2ND NAVIGATIONAL BUREAU 2ND ENG