Long auger drilling and bottom expanding device and expanded anchor rod construction method

Abstract

The invention relates to a long auger drilling and bottom expanding device and an expanded anchor rod construction method. The long auger drilling and bottom expanding device comprises an auger drilling rod with an auger blade and a front guide drill bit. The upper portion of the auger drilling rod is connected with a power box of a pile machine through a rotary connector, a slurry inlet is formed in the rotary connector, motors are arranged on the two sides of the upper portion of the power box, a broaching oil cylinder support and a broaching oil cylinder are arranged in the middle of the upper portion of the power box, a connecting lug is arranged in the middle of the upper portion of the oil cylinder support, the broaching oil cylinder is hinged to the broaching oil cylinder support through the connecting lug, the lower end of a piston rod of the broaching oil cylinder is connected with the top of a broaching connecting rod through a transfer connector, the lower portion of the broaching connecting rod is arranged in an axial central through hole of the auger drilling rod, a rotary broaching device is arranged between the front guide drill bit and the auger drilling rod, the lower end of the broaching connecting rod is connected with the rotary broaching device, and the lower portion of the rotary broaching device is connected with the front guide drill bit. According to the long auger drilling and bottom expanding device and the expanded anchor rod construction method, noise, vibration and slurry are avoided in the construction process, an anchoring body is high in strength, good in quality, low in cost, high in working efficiency and good in environmental friendliness, and the uplift bearing capability of an anchor rod is high.

Description

technical field [0001] The invention belongs to the technical field of civil engineering construction, and relates to a device for expanding the bottom of long helical drilling holes and a construction method for constructing body-expanding anchor rods by using the device. Background technique [0002] In the field of geotechnical engineering, many slopes, excavation and support projects for foundation pits, and permanent structures for foundation anti-floating require the use of anchoring technology. At present, the traditional full-length and equal-diameter anchoring technology is still widely used. In the stratum with complex engineering geological conditions, such as the anchor rod installed in the soft and loose stratum, it is restricted by factors such as low friction in the anchorage section, resulting in the bolt resistance. The pull-out bearing capacity is low and the deformation is large. The traditional anchoring technology usually adopts the method of increasing ...

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Problems solved by technology

[0003] The present invention aims to solve the above-mentioned problems existing in the prior art, and provides a device for expanding the bottom of a long spiral drilling hole and a construction method for placing the bolt body after pouring mortar into the hole, so as to overcome the problem of expanding the hole expansion section in the existing construction technology. When drilling a hole, a secondary reaming drilling tool is required, the construction speed is slow, the construction cost is high, and the use of mud circulation in the process of hole forming and reaming produces a large amount of waste slurry to pollute the environment. The expansion bolt construction provided by the present invention No noise, no vibration, no mud during the construction process, high anchor strength, good quality, low cost, high work efficiency, more environmental protection and other characteristics, the pullout bearing capacity of the anchor is greatly improved

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