Drill bit for breaking waste pipe pile, and method for breaking waste pipe pile and pouring new pile

Abstract

The invention discloses a drill bit for breaking a waste pipe pile, and a method for breaking the waste pipe pile and pouring a new pile. The drill bit comprises a core shaft, spiral blades are arranged at the external circumference of the core shaft, and a connecting part in butt joint with a drill pipe of a drill jig is arranged at the top of the core shaft. A plurality of cutting teeth are formed at least below the middle of the spiral blades, a vertical steel bar bundle formed by a plurality of short steel bars in a welded mode is arranged at the bottom of the core shaft, the steel bar bundle is coaxial with the core shaft, and the outer diameter of the steel bar bundle is less than or equal to the inner diameter of the to-be-crushed waste pipe pile. The key of the method is that the two steps of waste pile crushing and new pile hole forming are integrated and conducted synchronously. According to the drill bit and the method, the waste pipe pile with the depth exceeding 20 meterscan be effectively broken, and waste pile breaking and new pile hole forming can be conducted synchronously, so that the construction efficiency is improved, and the construction cost is lowered.

Description

technical field [0001] The invention relates to the technical field of building foundation construction, in particular to a drill bit for breaking waste pipe piles and a method for using the drill bit to break waste pipe piles and inject new piles. Background technique [0002] In municipal construction, it is often necessary to demolish low, old and dilapidated buildings, and then build taller and newer buildings on the old foundations. This involves the removal of old piles and the construction of new piles. And what this application is aimed at is the dismantling of waste and old pipe piles. Of course, the pipe piles here should be understood in a broad sense, that is, the piles are hollow inside and the periphery is concrete. It includes hollow circular pipe piles such as high-strength piles. PHC pipe piles also include hollow square piles. [0003] The construction process of the waste pile reconstruction in the prior art is as follows: use a pile puller with a pile p...

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Problems solved by technology

[0004] The construction process of the prior art has the following defects: first, the length of the pile-extracting casing of the pile-extractor is limited, generally no more than 20 meters, so only pipe piles within a depth of 20 meters can be extracted. Existing pile-extracting equipment is powerless; moreover, for the construction unit, it is not a small cost to equip a set of pile-extracting equipment specially. If it is purchased, the utilization rate is low and it is not cost-effective; It is also necessary to bear the cost of equipment transition, which is not economically cost-effective. Moreover, equipment transition is time-consuming and laborious, and it is easy to delay the construction period; Step by step, the construction efficiency is not high

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