Underwater plugging and water sealing method for bottom plate of concrete pouring jacket without back cover

Abstract

The invention discloses an underwater plugging and water sealing method for a bottom plate of a concrete pouring jacket without a back cover, which comprises the following steps: providing a concrete pouring jacket, a plurality of light-weight back cover templates and a plurality of jacks; hoisting and lowering the concrete pouring jacket; after the concrete pouring jacket arrives a designated position, hanging and fixing the concrete pouring jacket on steel pile casings of filling piles through a hanger above; at least installing the jacks between the inner side wall of the concrete pouring jacket and each steel pile casing of the filling piles; stabilizing the concrete pouring jacket to resist the influence of wind waves; installing and fixing the back cover templates in the water body below the bottom plate of the pouring jacket by a diver; arranging a longitudinal water inlet pore path and a concrete pouring filling area which can realize internal and external water pressure balance; selecting bag concrete; carrying the bag concrete and entering water by the diver and pouring the concrete into the pouring filling area; and finally plugging the longitudinal water inlet pore path to finish plugging and water sealing. The invention can accelerate the installing speed of the concrete pouring jacket and is especially favorable for carrying out the water sealing operation on thebottom plate of the concrete pouring jacket.

Description

Technical field [0001] The invention mainly relates to the construction of bridge piers in the construction of cross-sea bridges, and is related to the construction method of concrete box cofferdams during the construction of the bridge pier caps. Background technique [0002] Bridge pier construction is the key to the construction of the sea-crossing bridge, and the construction of the platform is the key to the construction of the bridge pier. For caps with a bottom elevation lower than the water surface, it is necessary to install box cofferdams around the caps in the early stage to create a water-free dry construction environment for the construction of the caps, and then lash steel bars, support templates and Work such as pouring concrete. Boxed cofferdam construction is the most critical link in the construction of bridge piers, and it is a technical focus and difficulty. The pros and cons of the box cofferdam construction plan directly affects the construction speed, cos...

AI Technical Summary

Problems solved by technology

The commonly used steel box cofferdam scheme has the obvious disadvantages of long construction period, slow turnover and high construction cost

Aiming at the deficiencies of steel box cofferdams, Chinese patent ZL200710113358.5 discloses an underwater concrete box without a bottom seal and its application method, and Chinese patent ZL200810097489.5 discloses an underwater concrete box without a bottom cover for construction. Water-sealed capsules, in the above-mentioned technical scheme, since the underwater concrete casing without a bottom seal is prefabricated and assembled on the shore, after the upper steel wave-stopping box is removed after use, the concrete casing does not need to be dismantled. It forms a whole, so it has obvious advantages such as fast construction speed, convenient installation, and low cost in the whole construction cycle. However, the use of water-sealing capsules to stop water on the bottom plate has the following disadvantages found during use: First, the concrete casing is placed during the installation process. In the middle, the water-sealing capsule is easy to be scratched, causing the water-sealing capsule to not be inflated after the concrete box is put in place, and sometimes there will be air leakage from the inflation nozzle; once the water-sealing capsule leaks, the installation of the box will fail , the concrete box must be lifted again to replace the capsule; if the concrete box has been welded to the cast-in-situ pile steel casing after drainage, if there is air leakage from the water-sealing capsule at this time, resulting in water-stop failure, the concrete box is difficult to reprocess

Second, due to construction reasons, the steel casing of the cast-in-place pile is not absolutely vertical, and the inclination angles of the steel casing are different; at the same time, due to the small gap between the capsule groove and the steel casing of the cast-in-place pile, the concrete casing is due to The lowering distance is longer, it is easy to cause the water sealing capsule to be extruded or crushed by the steel casing of the cast-in-place pile, and the placement of the concrete casing will fail

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