Auxiliary equipment for overall sinking of open caisson and cofferdam structures and construction method

Abstract

The invention discloses auxiliary equipment for overall sinking of open caisson and cofferdam structures and a construction method. The auxiliary equipment comprises a walking mechanism, omnibearing self-propelled high-pressure jet soil sampling equipment and a monitoring system, the omnibearing self-propelled high-pressure jet soil sampling equipment is arranged on the walking mechanism, the walking mechanism is arranged on the inner wall of an open caisson or cofferdam, and the monitoring system is arranged on the walking mechanism; a lower end of the omnibearing self-propelled high-pressurejet soil sampling device extends to the position below the open caisson or the cofferdam, a pressure sensor is arranged at the lower end of the open caisson or the cofferdam, and the monitoring system is connected with the pressure sensor; the cut soil bodies are mixed into slurry to be sucked out of the drill rod, and therefore the open caisson and cofferdam structure can sink rapidly; construction parameters are monitored and controlled in real time, intelligent operation is achieved, the device is particularly suitable for stratums with uneven soil layer hardness and large strength difference, safety accidents such as structural inclination, displacement and even overturning are avoided, and safety of engineering construction is improved.

Description

technical field [0001] The invention relates to the technical field of bridge construction, in particular to an auxiliary device and a construction method for integral sinking of caissons and cofferdam structures. Background technique [0002] In recent years, with the rapid development of my country's infrastructure field, various large-scale cross-river and sea-crossing bridges emerge in endlessly. As a key link in the foundation construction of large bridges - the construction of caissons and cofferdams has become an indispensable link. [0003] At present, the sinking of caissons, cofferdams and other structures mainly depends on the self-weight of the structure and the assistance of mud and sand suction equipment such as air suction dredgers and cutter suction pumps. They sink while sucking and gradually reach the design elevation. When this method is applied in the shallow soft soil or sandy soil layer at the bottom of the river, the effect is relatively good, and the...

AI Technical Summary

Problems solved by technology

However, as the sinking depth continues to increase, the strength of the soil layer at the bottom of the structure is getting higher and higher, and the side friction resistance around it is increasing, resulting in a continuous decrease in the sinking coefficient of the structure, slower and slower sinking of the structure, and even Failure to sink to the design position will seriously affect the construction progress and increase the construction cost

Especially when encountering the stratum with uneven soft and hard soil layers and large strength differences at the bottom of the structure, unpredictable safety accidents such as structural inclination, displacement or even overturning are prone to occur, which brings great safety risks to engineering construction

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