Combined down-the-hole hammer and construction method thereof

Abstract

The invention discloses a combined down-the-hole hammer and a construction method thereof. The combined down-the-hole hammer comprises a coupler, a bracket body (3) and a plurality of small-diameter impacters (4) which are arranged on the bracket body (3), wherein one end of a gas distribution device (2) is connected with the bracket body (3), and the other end of the air distribution device (2) is connected with the coupler; the gas distribution device (2) is provided with a gas collection chamber (21); the gas collection chamber (21) is provided with gas distribution circuits communicated with the impacters (4); the gas distribution circuit which is connected with the impacter (4) arranged at the periphery has a large curvature gas circuit structure (22); the gas distribution circuit which is connected with the impacter (4) arranged in the center has a straight through structure (23); and the gas distribution device (2) is provided with a regulating device (26) capable of regulatinggas pressure and gas flow. The combined down-the-hole hammer constructed by the method has the advantages of low cost, reasonable structure, easy maintenance, convenient assembly and disassembly, reliable seal, effective energy utilization and high punching efficiency.

Description

technical field [0001] The invention relates to a down-the-hole hammer, in particular to a combined down-the-hole hammer capable of drilling holes in hard strata and rock formations and constructing foundation piles. The invention also relates to a construction method of the combined down-the-hole hammer. 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 (as 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 an i...

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

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