Rotation-revolution combined down-hole hammer and construction method thereof

Abstract

The invention discloses a rotation-revolution combined down-hole hammer. A front end of a hammer body (42) of a hammer (4) is provided with a cylindrical guide sleeve (47); the neck part of a hammer bit (45) is provided with a cylindrical guide shaft (49); the cylindrical guide shaft (49) of the hammer bit (45) is inserted into the cylindrical guide sleeve (47) at the front end of the hammer body(42) and positioned through a split limiting ring (48), so that the hammer bit (45) can axially move and be coaxially and rotatably arranged on the hammer body (42); the hammer bit of the hammer can relatively rotate; when the combined down-hole hammer punches rotatably, the hammer bits of a plurality of small-diameter hammers can also rotate while the hammer bits revolute; and a damping adjustment ring is arranged in an air dividing device. The invention provides the combined down-hole hammer and a construction method thereof; and a hard alloy head on the hammer drill is worn towards equilibrium, so that the working efficiency can be improved and the service life can be prolonged, and the combined down-hole hammer has low cost, a rational structure, high punching efficiency and long service life, is easy to maintain, convenient to disassemble and reliable to seal and can save energy.

Description

technical field [0001] The invention relates to a pile foundation construction machine, in particular to a self-rotating and revolving combined down-the-hole hammer capable of drilling holes in hard ground and rock formations and building foundation piles and a construction method thereof. Background technique [0002] The foundation pile construction usually uses a drilling rig to drive the drill bit to drill holes in the ground, and then put a steel cage in the hole and pour concrete. After the concrete solidifies, it becomes a foundation pile; To use a hammer (also known as a down-the-hole hammer) for percussion drilling, because the hammer has the function of high-efficiency drilling in hard rock formations, it is widely used in mining and building foundation construction. [0003] This well-known impactor (published on pages 66 to 68 of Chapter 1 of "China Mining Equipment Handbook-Volume 1" published by Science Press) is also commonly known as the integral DTH hammer 2...

AI Technical Summary

Problems solved by technology

[0005] 1. Large-diameter integral down-the-hole hammers require high processing technology, are difficult to manufacture, are prone to quality problems, and have high manufacturing costs;

[0006] 2. Due to its large size and heavy weight, it is inconvenient to maintain and repair. Once a certain alloy head on the drill bit is damaged during work, it must be removed and repaired as a whole, which delays the construction period and costs more;

[0007] 3. Due to the large diameter and heavy weight, the taper thread joint needs to be rotated as a whole, and a large torque is required to tighten it to achieve the required sealing performance. It is inconvenient to install and disassemble on site.

[0010] 1. Due to the large diameter and heavy weight of the cluster DTH hammer, it also needs to be rotated as a whole when connected in the form of a taper thread joint, and a large torque is required to tighten it to achieve the required sealing performance, which is inconvenient to install and disassemble on site;

[0011] 2. When the compressed air enters the impactor from the horizontal air path, the corner is almost right angle, so the pressure loss is large and the efficiency is low;

[0012] 3. According to the

Images