High-low cutting edge double-wall steel cofferdam reinforced concrete once bottom sealing construction method

Abstract

The invention discloses a high-low cutting edge double-wall steel cofferdam reinforced concrete once bottom sealing construction method which comprises the steps that Step one, steel cofferdam construction is performed: double-wall steel cofferdam sinks to a pre-designed construction position, high-low cutting edges are arranged at the bottom of the double-wall steel cofferdam, inclined surfaces are designed as the bottom surfaces of the cutting edges, and are supported on an inclined bare rock surface, and a plurality of groups of first anchor steel bars are arranged on the cutting edges; Step two, steel casing laying is performed: a steel bar anchor structure is arranged on the outer side wall of the bottom of each steel casing, and comprises a plurality of rows of second anchor steel bars distributed from the top down; Step three, riverbed rock surface patching is performed: a riverbed rock surface is backfilled with a mixture to form a backfilled layer; and Step four, bottom sealing reinforced concrete layer construction is performed: a horizontal steel bar mesh is mounted on the backfilled layer, and concrete is poured into the double-wall steel cofferdam to form a concrete bottom sealing layer. The method is simple in step, reasonable in design, low in construction difficulty, short in construction period and good in using effect, and can effectively solve the various problems in the conventional 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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