Hollow thread-shaped drill bit suitable for super long screw pile cast-in-situ construction in soft foundation and using method of hollow thread-shaped drill bit

Abstract

The invention provides a hollow thread-shaped drill bit suitable for super long screw pile cast-in-situ construction in a soft foundation and a using method of the hollow thread-shaped drill bit. The hollow thread-shaped drill bit comprises a pile shoe, a first hollow threaded drill rod, a plurality of second hollow threaded drill rods, a plurality of annular steel hoops and a plurality of pin bolts. In work, the lower end of the first hollow threaded drill rod is connected with the pile shoe, and the upper end of the first hollow threaded drill rod is connected with the second hollow threaded drill rods or a rotary driving part of a drilling machine. The lower end of each second hollow threaded drill rod is connected with the first hollow threaded drill rod or the adjacent second hollow threaded drill rods, and the upper end of each second hollow threaded drill rod is connected with the adjacent second hollow threaded drill rods or the rotary driving part of the drilling machine. The using method of the hollow thread-shaped drill bit comprises the steps of pile shoe fixing, first hollow threaded drill rod mounting, drilling, reverse rotation for drill bit lifting and the like. According to the hollow thread-shaped drill bit, the drilling tool falling risk is avoided, the phenomena of hole collapse, hole shrinkage and the like are not prone to occurring in construction, the screw pile construction quality can be ensured, and the hollow thread-shaped drill bit suitable for super long screw pile cast-in-situ construction in the soft foundation and the using method of the hollow thread-shaped drill bit are specially suitable for screw pile construction in the soft foundation.

Description

technical field [0001] The invention relates to the field of construction tools, in particular to an extendable hollow threaded drill bit. Background technique [0002] Compared with conventional straight rod piles, screw piles have a much larger pile side area and a much larger load-carrying capacity provided by pile side friction resistance when the cross-sectional area and length of the pile body are the same, making the screw pile The bearing capacity of the pile is greater than that of the conventional straight pole pile, so it is favored by the engineering and academic circles. [0003] When the ground is soft and the hole collapse and shrinkage are prone to occur during the hole-forming construction of the screw pile, the construction process of the threaded rod is usually as follows: firstly use a drilling rig to drill the hollow screw drill bit into the ground to a predetermined depth, and then install steel bars and pour into the drill bit Concrete, and finally re...

AI Technical Summary

Problems solved by technology

[0004] Although the advantages of this screw pile construction technology are obvious, its disadvantages are also prominent, and its disadvantages are mainly reflected in two aspects: one is that the hollow threaded drill bit used cannot be replaced or extended during construction, which makes the construction process difficult. The length of the screw pile cannot be lengthened according to the actual formation conditions; secondly, due to the limitation of the height of the drilling rig, or the limitation of the construction area space, especially the clearance height, the length of the hollow threaded drill bit actually used in the project cannot be very long, and cannot Realize the construction of super long screw pile

Images