Rock breaking construction method of underwater deep foundation trench

Abstract

The invention relates to a rock breaking construction method of an underwater deep foundation trench. The method comprises the following steps that the depth and sound velocity profile information ofa dredging construction area is determined; a construction ship accurately positions the dredging construction area through a positioning system; the construction ship excavates the soil covering layer of the dredging construction area; the rock distribution condition of the dredging construction area is determined through secondary measurement; rock drilling points and the number of times of rockdrilling are set, and rock breaking construction is conducted through a rock breaking hammer; broken rock is removed; and the dredging construction area is measured, and if the measurement result meets the acceptance standard, construction of the dredging construction area is finished. According to the method, rock breaking treatment can be conducted on rock of an underwater deep trench foundation bed, the adaptability is high, the method can be applied to treatment construction of rock strata with various strengths and large water depth, the implementation precision is high, the implementation process does not relate to use of detonators and explosives, the influence on the surrounding environment is small, environmental protection is achieved, the operation process is safe and reliable,and the popularization value is extremely high.

Description

technical field [0001] The invention relates to the technical field of dredging, in particular to an underwater deep foundation trench rock breaking construction method. Background technique [0002] At present, in dredging projects at home and abroad, underwater rocks are often treated by underwater blasting, heavy grabs, mechanical reamers or hydraulic breakers. The above-mentioned underwater rock treatment methods can treat rocks under different underwater conditions respectively, but there are still some problems: such as the high construction cost of underwater blasting technology, great impact on the underwater environment, environmental assessment before blasting and Relevant procedures are difficult to approve; heavy-duty grabs rely on their own weight to break rocks, and are limited by their own gravity and water depth, so they cannot treat large areas of rock layers, and the strength of rocks that can be processed is relatively small; The deep working environment ...

AI Technical Summary

Problems solved by technology

The above-mentioned underwater rock treatment methods can treat rocks under different underwater conditions respectively, but there are still some problems: such as the high construction cost of underwater blasting technology, great impact on the underwater environment, environmental assessment before blasting and Relevant procedures are difficult to approve; heavy-duty grabs rely on their own weight to break rocks, and are limited by their own gravity and water depth, so they cannot treat large areas of rock layers, and the strength of rocks that can be processed is relatively small; The deep working environment is difficult to apply; the construction depth of the hydraulic breaker is not large, the precision is low and the stability of the carrier is high, and the reliability of the equipment is poor

In the construction of underwater deep groove foundation bed, it is necessary to treat moderately weathered rock, which has relatively high hardness and strength. However, there is no relevant underwater rock treatment process at home and abroad for reference, which cannot meet the actual dredging construction requirements. need

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