Open caisson non-drainage sinking construction method

Abstract

The invention relates to an open caisson non-drainage sinking construction method. The method comprises the following steps that S1, water jetting pipes are arranged around an open caisson, high-pressure water is sprayed on a soil body around the open caisson, and the soil body in the side wall area of the open caisson is cut and softened; S2, high-pressure water is sprayed into the open caisson so that the high-pressure water punches a soil body at the bottom of the open caisson, the bottom of the open caisson is punched into a pot bottom shape with a concave center, the soil body and the water are mixed to form slurry, then the slurry is pumped out of the open caisson, and the open caisson squeezes soil and sinks at the positions of blade feet; S3, every time the open caisson sinks by acertain distance, high-pressure water spraying is conducted on a soil body in a newly-sinking area of the open caisson through the water jetting pipes in a segmented water injection mode; S4, after the open caisson sinks to the designed position, grouting is conducted on a soil body outside the open caisson in a retreating type segmented grouting mode through the water jetting pipes, and the soilbody outside the open caisson is reinforced; and S5, concrete bottom sealing is conducted on the bottom of the open caisson. According to the open caisson non-drainage sinking construction method, theproblems of inclination, sudden sinking and water gushing during sinking of the open caisson can be reduced.

Description

technical field [0001] The present application relates to the field of caisson construction, in particular to a construction method for undrained caisson sinking. Background technique [0002] Caisson is a construction technique commonly used in underwater construction. In the construction of bridge foundations, there are mostly square, round, oval and other forms. During construction, the first section is poured in advance, and the bottom is hollowed out after solidification. The concrete block begins to sink, and then the top is continued to be poured, and then hollowed out after completion, and the cycle is repeated. , until the bottom of the foundation is excavated. [0003] During the sinking of large caissons with poor soil quality and high water content, accidents such as inclination, sudden sinking, water gushing and sand gushing at the bottom of the well often occur. Therefore, designing a caisson undrained sinking construction method to prevent the above-mentione...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the technical problems of caisson inclination, sudden sinking and water gushing in the traditional caisson drainage and sinking method, this application provides a non-drainage and sinking construction method for caissons