Construction method and structure of underwater reinforced concrete combined suspension-box cofferdam free of bottom-sealing concrete

Abstract

The invention discloses a construction method and structure of an underwater reinforced concrete combined suspension-box cofferdam free of bottom-sealing concrete. The construction method comprises the following steps: after pile foundation construction is finished, manufacturing a suspension box; mounting carrying pole beams and continuous jacks on pile casings as lowering devices of the suspension box; slowly lowering the suspension box in place with the jacks; and pouring underwater undispersed concrete between a bottom board and annular stepped grooves of the pile casings. According to the technological method, the suspension box stops water by virtue of the reinforced concrete bottom board and the underwater undispersed concrete, which can thoroughly break through the conventional construction method in which bottom sealing is indispensable in construction of an underwater bridge / wharf pile cap suspension box cofferdam, saves a great amount of concrete and steel, reduces the construction cost, simplifies construction procedures and shortens the construction period; and the method is simple in process and convenient to operate, has a good water-stopping effect and a wide application range, has low requirements on ambient environment, corollary equipment and operation level of workers, and has high popularization and application values.

Description

technical field [0001] The invention relates to the technical field of civil engineering, in particular to a non-backed steel sheet suitable for the construction of high pile caps for inland river or sea bridges, high pile caps for wharves, or ship locks in industries such as roads, railways, municipal administration, water transportation, water conservancy and hydropower. The construction method and structure of the cofferdam with hanging boxes combined. Background technique [0002] At present, in the construction of bridges or wharf foundations in water, the waterproof cofferdams generally include: steel sheet pile cofferdams, locked steel pipe pile cofferdams, double-wall steel cofferdams, reinforced concrete cofferdams, bottomless steel casings, and bottomed steel cofferdams. Steel hanging box cofferdam and other forms. Among them, the steel hanging box cofferdam has the characteristics of short construction period, no need to sink into the river bed, less material con...

AI Technical Summary

Problems solved by technology

However, this technology has high requirements on the design and manufacture of steel hanging boxes, workers’ operating level and related supporting equipment. A slight difference will affect the water-stopping effect. If water leakage occurs, it will be very troublesome to deal with, and the capsule water-stopping method is harmful The positioning effect of the steel hanging box is affected

Therefore, this technology has not yet been widely used in China.

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