One-time back-sealing construction method of reinforced concrete with double-walled steel cofferdam with high and low blade feet

Abstract

The invention discloses a one-time back-sealing construction method for reinforced concrete with double-wall steel cofferdams with high and low blade feet, comprising steps: 1. Construction of steel cofferdams: sinking the double-wall steel cofferdams to a pre-designed construction position; double-wall steel cofferdams There is a blade foot at the bottom of the weir, and the blade foot is a high and low blade foot; the bottom surface of the blade foot is an inclined surface and it is supported on the inclined bare rock surface; there are multiple sets of first anchoring steel bars on the blade foot; 2. The lowering of the steel casing: The outer wall of the bottom of each steel casing is provided with a reinforcement anchorage structure, and the reinforcement anchorage structure includes multiple rows of second anchorage reinforcement arranged from top to bottom; 3. Embedding of the rock surface of the river bed: backfilling with mixture and forming a backfill layer; Fourth, the construction of the reinforced concrete layer of the bottom cover: first install the horizontal steel mesh above the backfill layer, and then pour concrete into it to form a concrete bottom seal. The method of the invention has simple steps, reasonable design, low construction difficulty, short construction period and good application effect, and can effectively solve various problems existing in the existing plain concrete bottom sealing method.

Description

technical field [0001] The invention belongs to the technical field of bridge foundation construction, and in particular relates to a reinforced concrete one-time back-sealing construction method for double-walled steel cofferdams with high and low blade feet. Background technique [0002] In the process of using double-wall steel cofferdams to construct bridge foundations in deep water, high flow velocity, and inclined bare rock riverbed areas, plain concrete structures are currently used for back-sealing construction of double-wall steel cofferdams. Due to the low flexural strength of plain concrete, in order to resist the external water buoyancy, the thickness of the plain concrete structure increases with the deepening of the water; because the designed concrete thickness is thicker, the distance between the bottom of the structure and the river bed needs to be large enough. When the concrete design thickness requirements are not met, the riverbed needs to be treated; es...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a one-time back-sealing construction method of reinforced concrete with double-walled steel cofferdam with high and low blade feet, which has simple steps, reasonable design, low construction difficulty and short construction period. , The use effect is good, and it can solve the problems of large amount of concrete, difficult construction, labor and time-consuming, and large safety hazards existing in the existing plain concrete bottom sealing method.

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