Method for performing dredging construction on hard rocks by using cutter suction dredger on basis of rock softening characteristics

Abstract

The invention relates to a method for performing dredging construction on hard rocks by using a cutter suction dredger on the basis of rock softening characteristics, and belongs to the technical field of dredging engineering. The method for performing dredging construction on the hard rocks by using the cutter suction dredger on the basis of the rock softening characteristics is characterized in that when underwater hard rocks located below a covering layer are dredged, the covering layer is firstly removed, so that the hard rocks are sufficiently contacted with water; and when the water content of the hard rocks is increased and the mechanical strength is reduced, the cutter suction dredger performs excavation construction. The method has the advantages that impact and abrasion of an excavation machine tool and ship vibration are reduced, operation safety of equipment on a ship and the working environment of a worker are guaranteed, the yield is increased substantially, the productivity is high, the production cost is low, the application range is wide and the like; and according to the method, natural force is used for dredging, the energy consumption is obviously reduced, and the method can also be used for engineering about related dredging construction of excavating hard soil by using ship tools such as a grab bucket, a back-acting shovel and the like.

Description

technical field [0001] The invention belongs to the technical field of dredging engineering, in particular to a construction method for dredging hard rock by a cutter suction ship based on rock softening characteristics. Background technique [0002] At present, cutter suction dredgers have the characteristics of continuous operation, high production efficiency, and low construction cost, but this feature is limited in rock conditions. Due to the high strength of the rock, the excavation resistance and equipment load increase accordingly, resulting in ship vibration, excavator breakage or increased wear, reduced ship productivity, shortened service time of excavator tools, increased construction costs, and extended construction periods. In this context, there are two ways to increase the output of dredgers: one is to improve the ability of dredgers to excavate rocks, increase the power of reamers and the weight of bridges, etc., but the construction cost increases, and some ...

AI Technical Summary

Problems solved by technology

[0002] At present, cutter suction dredgers have the characteristics of continuous operation, high production efficiency, and low construction cost, but this feature is limited in rock conditions

Due to the high strength of the rock, the excavation resistance and equipment load increase accordingly, resulting in ship vibration, excavator breakage or increased wear, reduced ship productivity, shortened usable time of excavator tools, increased construction costs, and extended construction periods.

In this context, there are two ways to increase the output of dredgers: one is to improve the ability of dredgers to excavate rocks, increase the power of reamers and the weight of bridges, etc., but the construction cost increases, and some ships The second is to change the rock excavation method, use the underwater reef blasting method to destroy the rock structure, and then use the grab boat to clean it, but it has a huge impact on environmental protection and ecology, and underwater blasting operations are prohibited in non-essential working conditions. Subject to many restrictions, there are technical problems such as low production efficiency and difficult implementation

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