Method for using high-pressure rotary jet grouting pile nozzle for road and bridge construction

Abstract

The invention discloses a method for using a high-pressure rotary jet grouting pile nozzle for road and bridge construction. The high-pressure rotary jet grouting pile nozzle comprises a rod body anda conical head, wherein the rod body is internally of a cavity structure, a grout conveying pipe is arranged in the cavity, a moving assembly is also arranged in the cavity of the rod body, the circumferential outer wall of the rod body is further provided with a plurality of drill blades, when the moving assembly moves towards the conical head, the moving assembly can push the drill blades to move in the direction away from the rod body, baffles are arranged on the side walls, facing the conical head, of the drill blades, stretchable pipes are further arranged in the cavity of the rod body, one ends of the stretchable pipes communicate with the grout conveying pipe, the other ends of the stretchable pipes are provided with joints, the circumferential outer wall of the rod body is furtherprovided with nozzle assemblies with the number same as the number of the drill blades, one ends of the nozzle assemblies face the drill blades, and the other ends of the nozzle assemblies are locatedin the cavity of the rod body. According to the method, the diameter of a pile hole drilled by the drill bit can be adjusted, then different use requirements can be met, meanwhile, it is guaranteed that in the drilling-down process of the drill bit, mud and stones in soil can be prevented from blocking the grout conveying pipe, and the construction efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of road and bridge construction equipment, in particular to a method for using a high-pressure rotary jetting pile nozzle for road and bridge construction. Background technique [0002] High-pressure rotary grouting piles use high-pressure rotating nozzles to spray cement slurry into the soil layer and mix with the soil to form a continuous lapped cement reinforcement. The construction area is small, the vibration is small, the noise is low, and it has the advantages of saving wood and steel, durable, and low cost. It has been widely used in the basic engineering of hydraulic construction, industrial construction, civil construction and bridges. The high-pressure rotary grouting pile is to use a drilling rig to drill the rotary grouting pipe and the nozzle at the design elevation of the pile bottom, pass the pre-prepared grout through the high-pressure generating device to make the liquid flow obtain huge en...

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Problems solved by technology

[0003] At present, the size of the pile hole formed by most of the existing drill bits is fixed, and it is impossible to flexibly adjust the size of the pile hole formed by the drill bit according to the actual use needs. On the outer wall, when the high-pressure rotary grouting pile machine is drilling in the soil, the gravel and soil in the soil are easy to enter the nozzle and block the slurry delivery pipe, so that the cement slurry cannot flow out normally and the subsequent construction The process cannot continue, and it takes manpower and time to lift the drill pipe out of the hole and then dredge it, which reduces the construction efficiency and delays the construction period

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