Steel cofferdam initiative sinking deviation correcting construction device and method

Abstract

The invention discloses a steel cofferdam initiative sinking deviation correcting construction device. The steel cofferdam initiative sinking deviation correcting construction device comprises steel protection cylinder counter-force brackets, steel cofferdam counter-force brackets, centre hole jacks and pull rods, wherein the number of the pull rods is equal to the number of the steel protection cylinder counter-force brackets, the number of the steel cofferdam counter-force brackets is equal to the number of the steel protection cylinder counter-force brackets, the steel cofferdam counter-force brackets correspond to the steel protection cylinder counter-force brackets in a one-to-one manner, and each pull rod sequentially penetrates the corresponding jack, the corresponding steel cofferdam counter-force bracket and the corresponding steel protection cylinder counter-force bracket from top to bottom. According to a construction method for conducting steel cofferdam initiative sinking deviation correcting through the construction device, pistons of the jacks stretch out for tightening of the pull rods, the pull force exerted on the pull rods is converted into downward press force for a steel cofferdam, and accordingly, the steel cofferdam is subjected to initiative downward press force to sink. Due to application of the initiative downward press force, the balance weight is increased equivalently, and therefore the sinking speed of the steel cofferdam can be increased, and the mud sucking and soil excavating workload is reduced; and compared with existing deviation correcting purely through mud sucking, pressurized deviation correcting is rapid and accurate.

Description

technical field [0001] The invention relates to the construction field of bridges and water conservancy foundations, in particular to a construction device and construction method for active sinking and deviation correction of steel cofferdams. Background technique [0002] Steel cofferdam (also known as steel casing) is usually used as the water retaining structure of the bridge pier cap, and also serves as a formwork for pouring concrete. Usually, after putting mud under the steel cofferdam, it cannot sink to the design elevation by its own weight. In the past, it was necessary to add water or concrete or sand to the steel cofferdam compartment as a counterweight to make it sink. [0003] When the depth of the mud entry is large, the resistance of the mud will be very large. Even if the steel cofferdam compartment is filled with concrete as a counterweight, its weight is not enough to make it sink, or it can sink but very slowly. In the past, the only way to sink the stee...

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Problems solved by technology

However, this kind of mud suction takes a long time and is expensive. When sucking mud outside the steel cofferdam, the safety is not high, and it is easy to make the soil at the bottom of the steel cofferdam penetrate inside and outside; in addition, the density of water is small, such as in the steel cofferdam. Adding water to the cabin as a counterweight is often not enough weight, adding sand and gravel is not easy to transport, and adding concrete is too expensive

[0004] In the past, the sinking construction method of the steel cofferdam relied on its own weight plus counterweight or combined with mud suction and excavation to sink, which was passive sinking. , only suck the mud on the side with less sinking to correct the deviation, which is labor-intensive and time-consuming

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