Filling pile spiral hoisting slurry drill pipe

Abstract

The invention discloses a filling pile spiral hoisting slurry drill pipe, which comprises a section or a plurality of sections of hollow drill pipes and drill pipe joints connected with the hollow drill pipes, wherein spiral blades are arranged on the outer surfaces of the hollow drill pipes; every two sections of hollow drill pipes are connected through the drill pipe joints; and a slurry spraying opening is formed in a connecting part of the first section of hollow drill pipe and a drill bit. Generally, The spiral blades are welded onto a hollow drill hole and are arranged at the lower section of the hollow drill pipes; and the length of the spiral blades is 1 / 4 to 1 / 2 of the total length of the hollow drill pipes, and the diameter of the spiral blades is smaller than the diameter of the drill bit. During the construction, the spiral blades rotate in the positive direction along the drill pipes; the upward hoisting force is generated on slurry at the lower section of a pile hole, and mud blocks in the slurry; and meanwhile, downward thrust is generated on the drill pipes. The drill pipe has the effects of connecting the drill bit and transmitting the drill bit and also has the effect of hoisting the slurry, so that the practical value of the drill pipe is improved.

Description

technical field [0001] The invention relates to a drill pipe, in particular to a screw-lifting mud drill pipe for cast-in-place piles. Background technique [0002] At present, during the construction of conventional bored piles, the functions of the drill pipe are as follows: one is to connect the drill bit with the construction equipment through the connection of multiple drill pipes when the drill bit sinks; The equipment is passed to the drill bit, which causes the bit to rotate. [0003] The patent number: "ZL 20132 0103907.1" and the Chinese patent with the patent name "A soft soil foundation cast-in-place pile forced cutting drill bit" provides a drill bit. The beneficial effects of using the drill bit are that the drill bit sinks quickly and the construction efficiency is high. However, the drill bit is only used for the mud reverse circulation process (that is, the mud is sucked from the drill bit). If the construction method adopts the mud positive circulation (th...

AI Technical Summary

Problems solved by technology

However, this drill bit is limited to the process of mud reverse circulation (that is, sucking mud from the drill bit). If the construction method adopts mud circulation (that is, mud is sprayed out from the drill bit), the mud concentration at the lower end of the pile hole will gradually increase. It is difficult for thick slurry and mud to discharge from the lower part of the pile hole to the hole of the pile

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