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 arrangement of small-diameter impactors, under the same rotation conditions, the central impactor and the surrounding impactors cover different perforation areas, and the impact frequency (work) should be different, but the air pressure and flow rate in the gas circuit are the same. Evenly divided, no adjustment function, no effective use of energy, low efficiency

[0013] 4. When the cluster down-the-hole hammer rotates to drill holes, the outer part of the impact drill arranged on the outer peripheral small-diameter impactor is different from the inner part of the peripheral line speed, and the work is different. The wear of the hard alloy head distributed on the impact drill Also different, the carbide tip on the outside wears out faster than the inside, works unevenly and has a lower overall lifespan

[0014] 5. In order to overcome the shortcomings of the above 4, when the outer wear of the impact drill occurs, it is necessary to dismantle the small-diameter impactors arranged on the outer periphery, rotate 180 degrees and install them back. This can solve the problem of uneven wear, but in It is inconvenient to install and disassemble on site, and it will also affect the construction progress

Images