Construction method of deepwater cast-in-place concrete cofferdam

Abstract

The invention discloses a construction method of a deepwater cast-in-place concrete cofferdam. The method comprises the following steps of building a shortcut to a cofferdam in water by using existing earth and stone materials of a riverbed, and building a construction platform on the outer side of the cofferdam by using existing earth and stone materials of the riverbed; clearing sludge at the cofferdam until a rock stratum at the bottom of the riverbed is exposed, and then roughening the surface of the rock stratum to form a hard irregular rough surface; removing rock debris generated after roughening by utilizing mud suction equipment, then digging out a shortcut, backfilling soil and stone materials to an original place to erect a scaffold steel pipe temporary bridge to the cofferdam, and erecting a form frame at the cofferdam by utilizing steel pipes in a transversely and longitudinally staggered mode; erecting a form on the form frame, and then binding steel bars underwater at the cofferdam; pouring concrete at the cofferdam till the concrete is exposed out of the water surface by 50 cm; and after the concrete is solidified to meet the strength requirement, discharging water in the cofferdam, and dismantling the form frame. According to the construction method, the construction cost is low, the construction difficulty is low, and soil and stone materials are saved in a construction process; and the concrete cofferdam subjected to pouring through the method is good in water insulation effect.

Description

technical field [0001] The invention belongs to the technical field of deep-water foundation construction, and in particular relates to a construction method of a deep-water cast-in-place concrete cofferdam. Background technique [0002] As the country continues to invest in large-scale infrastructure construction, the construction of railways and roads has skyrocketed, and the proportion of bridges is increasing. Bridges are often used to cross obstacles such as large rivers. Due to the excessive width of rivers, it is difficult to design bridges In some cases, the pier body of some bridges needs to be set in the river, and for the consideration of anti-scouring, the design institute usually buries the foundation of the bridge pier - cap platform at the bottom of the river bed. The cofferdam is used to retain water, and then structures such as bored piles and caps are constructed in the cofferdam. [0003] In the current deep water foundation construction, steel sheet pile...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a construction method for deep-water cast-in-place concrete cofferdams, which solves the problems of difficulty in piling and the need to transport earth and stone materials in the construction process of existing deep-water cofferdams