Underwater blasting soil sampling device and method of soil body under foot blades of open caisson

Abstract

The invention discloses an underwater blasting soil sampling device and method of a soil body under foot blades of an open caisson, and relates to the technical field of bridge foundation construction. The device comprises the open caisson, wherein the open caisson comprises an open caisson wall; the foot blades are arranged at one end of the open caisson wall; the open caisson is provided with a plurality of guide holes; the guide holes penetrate through the top end of the open caisson wall and the foot blades; and bracket supports are arranged at the top end of the open caisson wall. The device further comprises blasting areas; the open caisson is pressed against the blasting areas; the blasting areas are provided with blasting holes located below the foot blades and communicating with the guide holes; and the blasting areas are further provided with blasting grooves adjoining to the inner wall of the open caisson wall. The underwater blasting soil sampling device of the soil body under the foot blades of the open caisson can avoid the diving operation in the blasting process and greatly improve the soil sampling efficiency of the soil body under the underwater foot blades.

Description

technical field [0001] The invention relates to the technical field of bridge foundation construction, in particular to an underwater blasting soil extraction device and method for the soil directly under the blade foot of a caisson. Background technique [0002] As the basic structure of the bridge, the caisson has the characteristics of high bearing capacity, high rigidity and good integrity. With the implementation of China's "One Belt, One Road" great strategic concept, my country will build a number of coastal or sea-crossing bridges, but the geological conditions in coastal areas are generally hard clay layers, and the bedrock is deeply buried, which is not suitable for pile group foundations. In the use of caisson foundation. [0003] The caisson foundation generally needs to be sunk into the designed soil layer, and the ratio of the caisson’s own weight to the resistance (including side friction and frontal resistance) of the caisson, that is, the subsidence coeffici...

AI Technical Summary

Problems solved by technology

[0004] However, when the caisson cannot be subsided by drainage and encounters a hard soil layer during the sinking process, firstly, it is impossible to use manual direct (or artificial drilling and blasting assistance) to remove the soil directly below the caisson blade foot; secondly, due to subsidence The well wall and blade foot are designed with a certain width, and the soil directly below the blade foot cannot be collected by conventional underwater vertical suction equipment

The above reasons make it difficult or impossible to take out the hard soil layer under the foot of the caisson blade. Under the joint action of side friction and frontal resistance, the sinking of the caisson is difficult or impossible.

Images