Combined temporary cofferdam for crossing river channel and construction method of combined temporary cofferdam

Abstract

The invention belongs to the technical field of cofferdam construction, and particularly relates to a combined temporary cofferdam for crossing a river channel and a construction method of the combined temporary cofferdam. The combined temporary cofferdam comprises a temporary cofferdam with a square cross section, the two ends of the temporary cofferdam correspond to the two banks of the river channel, and two inclined struts are arranged at the right-angle position of the temporary cofferdam; a square steel enclosing purlin is arranged on the inner side of the temporary cofferdam, a straight support is arranged in the middle of the square steel enclosing purlin and is parallel to the width direction of the square steel enclosing purlin, the temporary cofferdam is double-row cofferdams, each row of cofferdams are the same in structure, the two ends of each row of cofferdams are timber pile type cofferdams, and the middle of each row of cofferdams is a steel sheet pile type cofferdam; corresponding joints of the timber pile type cofferdams and the steel sheet pile type cofferdam are connected by welding seamless steel pipes and Z-shaped steel sheet piles; and a timber pile enclosing purlin is arranged on one side of the upper part of each row of timber pile type cofferdams correspondingly, and more than two opposite-pulling steel bars are bundled between a pair of timber pile enclosing purlins on the two rows of timber pile type cofferdams. Therefore, the temporary cofferdam is easy and convenient to construct, good in waterproof and anti-seepage performance and high in water flow impact resistance.

Description

technical field [0001] The invention belongs to the technical field of cofferdam construction, in particular to a combined temporary cofferdam for crossing a river and a construction method thereof. Background technique [0002] The cofferdam refers to the temporary maintenance structure built for the construction of water conservancy facilities. The function of the cofferdam is to prevent water and soil from entering the construction site of the building, so that construction operations can be carried out within a stable range. The main purpose of the cofferdam The types include wooden pile cofferdam, earth-rock cofferdam and steel sheet pile cofferdam. [0003] In practical application, steel sheet pile cofferdam has become a type that is widely used in cofferdam construction. It has good structural stability, high rigidity and strength, and its performance in resisting water impact and wave attack is superior to other forms of cofferdam. In recent years, Widely used in w...

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Problems solved by technology

[0004] However, during the construction process, the geological environment varies greatly, and the water depth varies within the span of the river. It is very uneconomical to arrange a single steel sheet pile cofferdam at a shallower water depth, resulting in a long construction period for the entire cofferdam and a large amount of work. Large, high construction risk

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