Multilayer drift rock contained soft soil layer hole forming device and hole forming method
A technology of a soft soil layer and a hole-forming device, which is applied in drilling equipment and methods, earthwork drilling, drilling equipment, etc., to achieve the effects of strong practicability, convenient use and accurate operation
Active Publication Date: 2014-08-27
SHANGHAI BAOYE GRP CORP
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Problems solved by technology
The invention can successfully solve the problem of anchor cables passing through drifting rocks, and can adapt to various special and complex geological conditions
Method used
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[0016] Such as figure 1 As shown, the present invention is a device for forming holes in weak soil layers containing multi-layer drifting rocks. It includes a drill rod 1 with a drill bit 4, and the end of the drill rod 1 is provided with an impact that can be adjusted to an eccentric state. The hammer 2, the drill pipe and the impact hammer 2 are provided with a large casing 3 when the hole is drilled, and the outer diameter of the large casing is larger than the design aperture; when drilling according to the design aperture, the large casing is replaced by a small casing with an outer diameter corresponding to the design aperture. casing (not shown in the figure).
[0017] The method for forming holes in weak soil layers containing multi-layer drifting rocks comprises the following steps:
[0018] Use the large casing to drill in the drifting rock area, and stop drilling when encountering boulders and riprap 5;
[0019] Put the impact hammer and drill pipe in the large ca...
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The invention relates to hole forming under the drift rock geological condition and particularly relates to hole forming in a multilayer drift rock contained soft soil layer. According to the multilayer drift rock contained soft soil layer hole forming method, a large hole diameter casing pipe is adopted to drill in a drift rock area, drilling is stopped when coming across boulders and riprap, an eccentric impact hammer and a drilling rod are arranged inside the large hole diameter casing pipe, the eccentric hammer posture is adjusted to enable the eccentric hammer to be in an eccentric state, holes are formed in the drift rock through the eccentric hammer, the formed hole diameter is larger than the large casing pipe hole diameter due to the fact that the hammer is in an eccentric state, the large casing pipe enters into the riprap or the boulders, the eccentric hammer postures are adjusted after the eccentric hammer penetrates the riprap or the boulders to enable the eccentric hammer to be in an axis state, the eccentric hammer and the drilling rod are taken out, the large casing pipe remains unchanged, then a small casing pipe is placed section by section, the large casing pipe is taken out after the small casing pipe is placed into the riprap or the boulders completely, and normal drilling construction is started. The multilayer drift rock contained soft soil layer hole forming method successfully solves the problem that an anchor cable penetrates the drift rock and can adapt to multiple specific complicated geological conditions.
Description
technical field [0001] The invention relates to pore forming under geological conditions of drifting rocks, in particular to pore forming in soft soil layers containing multiple layers of drifting rocks. Background technique [0002] It is much more difficult for the anchor cable to form holes when it encounters boulders and other drifting rocks than it is to form holes in simple soil layers and rocks. When forming holes in drifting rocks, if the general full casing drilling construction technology is used, it cannot be drilled when encountering drifting rocks; if a hydraulic diamond milling drill is used, the core cannot be taken out after milling; if a high-pressure impact hammer is used to form a hole Construction technology, after the impact hammer reaches the soil layer through drifting rocks, the casing cannot follow up to the soil layer. [0003] In order to solve the construction problem of casing passing through drifting rocks, various hole-forming technology tests...
Claims
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IPC IPC(8): E21B7/00
Inventor 庞洪海杨卫平苏云生庄道龙
Owner SHANGHAI BAOYE GRP CORP