Slope shallow layer support pipe-following and pipe-drawing device

Abstract

The utility model discloses a side slope shallow layer support follow pipe drawing device which comprises an impactor, the rear end portion of the impactor is fixedly welded with a pipe shoe through four connecting steel bars which are symmetrically arranged in the axial direction, and the pipe shoe is provided with connecting threads matched with a support follow pipe. An air supply pipe of the impactor is led out between the connecting steel bars to be connected with air supply equipment; the pipe drawing device is hung on a slope scaffold through at least two steel wire ropes. According to the pipe drawing device, construction is conducted in a reverse impacting mode of the impacter, the construction difficulty is lowered, and the construction efficiency is improved; the device is light in weight and small in transferring difficulty; the device adopts a modification design of a pore-forming equipment impactor, so that the construction cost is lower; the device is particularly suitable for pulling out shallow supporting follow pipes smaller than 7.5 m, and the efficiency of the device is 1.4-1.7 times that of traditional hydraulic pipe pulling according to field statistics. Required materials, equipment, wind and water power arrangement and the like are the same as those of slope support, additional configuration is not needed, and the applicability is high.

Description

Technical Field

[0001] This utility model belongs to the field of building construction technology, and in particular to the field of slope support construction technology in water conservancy and hydropower construction, specifically relating to a pipe pulling device for shallow slope support. Background Technology

[0002] In slope protection, foundation treatment, and underground engineering, casing drilling technology is commonly used for drilling in loose soil layers, fractured rock masses, and gravel layers—strata prone to collapse. However, traditional casing extraction technology has the following drawbacks: Low efficiency: Hydraulic casing extraction machines typically weigh over 260 kg, making them difficult to transport on high slopes or in narrow spaces. They also require multiple operators, usually four or more, resulting in low extraction efficiency, generally 0.2–0.25 m / min. Poor safety: Working with heavy equipment at heights increases the risk of falls, and there is a significant risk of falling objects during cross-operations. High cost: The purchase cost of a hydraulic casing extraction system reaches 12,000–14,000 RMB per set, and maintenance is complex. Insufficient adaptability: Shallow casing extraction (<7.5 m) is inefficient, and its application is limited in complex terrains such as steep slopes and narrow pits.

[0003] Therefore, there is an urgent need for a lightweight, efficient, safe, and adaptable tube removal device. Summary of the Invention

[0004] This utility model discloses a pipe pulling device for shallow slope support, addressing the shortcomings of existing technologies. The purpose of this utility model is to provide a pipe pulling device for shallow slope support that reduces operational difficulty, lowers safety risks, and improves pipe pulling efficiency, employing a reverse impact method with an impactor.

[0005] This utility model is achieved through the following technical solution:

[0006] A pipe pulling device for shallow slope support includes an impactor, characterized in that: the rear end of the impactor is welded and fixed to the pipe shoe by four axially symmetrically arranged connecting steel bars, and the pipe shoe has a connecting thread that matches the support pipe.

[0007] The air supply pipe of the impactor is led out from between the connecting steel bars and connected to the air supply equipment.

[0008] The pipe-pulling device is suspended from the slope scaffolding by at least two steel wire ropes.

[0009] The impactor is a down-the-hole drill impactor.

[0010] This utility model of tube-pulling device adopts reverse impact tube-pulling. It uses an impactor and compressed air as the power medium to generate a continuous impact load by using the energy of the compressed air. The reverse continuous impact force generated in the direction of air achieves the purpose of pulling out the tube.

[0011] This utility model's pipe-pulling device employs a reverse impact method, reducing construction difficulty and improving efficiency. The lightweight device significantly reduces the difficulty of transporting materials during high slope construction, lowering construction risks. The equipment used for reverse impact pipe pulling is a modified design of the impactor from slope drilling equipment, eliminating the need to purchase a dedicated hydraulic pipe-pulling system. The reverse impact utilizes conventional medium / high wind pressure power, further reducing construction costs. This utility model is particularly suitable for removing pipes from shallow supports less than 7.5m deep. Field statistics show that the reverse impact pipe-pulling efficiency is 1.4 to 1.7 times that of traditional hydraulic pipe-pulling. The required materials, equipment, and ventilation / water / electricity arrangements are the same as for slope support, requiring no additional configuration and demonstrating strong applicability. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the tube-pulling device of this utility model;

[0013] Figure 2 This is a schematic diagram of the installation and construction of the tube-pulling device of this utility model.

[0014] In the diagram, 1 is the impactor, 2 is the connecting steel bar, 3 is the pipe shoe, 4 is the air supply pipe, 5 is the support pipe, 6 is the suspension wire rope, 7 is the scaffold, and 8 is the slope. Detailed Implementation

[0015] The present invention will be further described below with reference to specific embodiments. These specific embodiments are further explanations of the principle of the present invention and are not intended to limit the present invention in any way. Any technology that is the same as or similar to the present invention does not exceed the protection scope of the present invention.

[0016] Refer to the attached diagram.

[0017] This utility model discloses a lightweight tube pulling device based on the principle of reverse impact, comprising the following modular components: an impactor module, a connection module, and an air supply module.

[0018] Impactor module: It adopts a conventional down-the-hole drill impactor, which is driven by compressed air and requires no additional power system.

[0019] Connection module: It is made of 4 Φ20 steel bars (L=0.25m) welded with matching tube shoes to realize the rigid connection between the impactor and the heel tube, ensuring the effective transmission of impact force.

[0020] Air supply module: Compatible with existing air compressor systems (medium / high air pressure), serving as the main source of air supply without the need for additional equipment.

[0021] By applying continuous reverse impact force, the pipe is gradually loosened and pulled out; a segmented disassembly method is adopted, and each section (1-1.5m) is removed and then the remaining pipe sections are reconnected to continue the operation.

[0022] like Figure 1 As shown in the figure, the pipe extraction device of this embodiment includes: an impactor 1, its impactor air supply pipe 3, a pipe shoe 3 that matches the support pipe 5 of the impactor 1, and the impactor 1 and the pipe shoe 3 are welded and fixed by four connecting steel bars 2 symmetrically arranged along the axis.

[0023] The impactor 1 selects an identical type of down-the-hole drill impactor for slope hole drilling and pipe following, and the aperture of the impactor is 90mm - 130mm. The impactor air supply pipe 3 is a pipeline supporting this type of impactor, and it is arranged to lead out from the end of the connecting steel bar 2.

[0024] As Figure 2 shown, during construction, first install the pipe extraction device, tightly connect the tail pipe shoe 3 of the pipe extraction device and the pipe to be extracted 5 through thread connection; use the safety rope as the suspension wire rope 6 to hang the pipe extraction device on the construction scaffolding 7 to prevent the device from falling off. Finally, connect the impactor air supply pipe 3 and connect the air supply equipment. During pipe extraction construction, start the air supply equipment and use the reverse impact force of the impactor 1 to perform pipe extraction operations; for each section of the support pipe 5 extracted, remove the connecting pipe shoe 3, then connect the pipe shoe 3 to the remaining support pipe 5 and extract them in sequence. When removing the pipe extraction device, first disconnect the impactor air supply pipe 3, then untie the suspension wire rope 6 to prevent falling objects; after removal, the pipe extraction device is promptly transferred to the next hole position for fixation.

[0025] The following uses a specific engineering example to illustrate the present utility model.

[0026] A certain hydropower station is the leading reservoir in a cascade development. The installed capacity of the power station is 3×70MW, the normal storage level of the reservoir is EL.1280.00, the maximum dam height is 186.30m, the total reservoir capacity is 184 million m 3 , the bottom length of the dam is 50.0m, the top length of the dam is 360.0m, and the top width of the dam is 12.0m.

[0027] The slopes on both sides of the hydropower station are high and steep, and the exposed rock layers during excavation are broken and fissure-developed. It is difficult to form holes for support such as anchor bolts, drainage holes, and anchor cables, and it is extremely easy to collapse the holes. According to the actual situation on site, the method of following the pipe and solidifying the wall by grouting is mostly adopted. The slopes mainly constructed by the method of following the pipe include the left bank near-dam slope (EL.1377.00 - EL.1097.00) with a height of 280m, the right bank near-dam slope (EL.1355.00 - EL.1097.00) with a height of 258m, the material yard slope (EL.1355.00 - EL.1145.00) with a height of 210m, and the surface hole outlet slope (EL.1280.00 - EL.1120.00) with a height of 160m.

[0028] Use the pipe following method to construct anchor bolts (depth 5 - 7.5m).

[0029] Select a 130mm down-the-hole drill impactor, and symmetrically weld 4 Φ20 steel bars to the pipe shoe ( Figure 1Weld length ≥ 50mm; connect air compressor (rated pressure 0.7MPa), check duct sealing; tighten pipe shoe to the end thread of pipe, and suspend safety rope to scaffold crossbar ( Figure 2 Adjust the angle of the impactor to ensure axial transmission of the impact force; turn on the air compressor, set the impact frequency to 18-22Hz, and the average tube pulling speed to 0.38m / min; stop the machine and disassemble one section of the tube after pulling out 1.5m, and repeat the operation until all sections are pulled out; check the weld after pulling out 3 holes, and there is no cracking; the tube thread is undamaged, indicating that the material recovery rate after pulling out the tube using this device is over 95%.

[0030] The following advantages are available with the pipe pulling device for shallow slope support of this invention:

[0031] Construction efficiency is significantly improved: the pipe pulling speed reaches 0.3-0.5m / min, which is 1.4-1.7 times higher than the traditional method (0.2-0.25m / min). It is especially suitable for rapid construction of shallow support (≤7.5m), and the single hole operation time is shortened by more than 40%, which accelerates the overall progress of the support project.

[0032] Safety performance has been greatly optimized: The total weight of the device is only 40kg, which is 85% lighter than hydraulic equipment, reducing the risk of high-altitude handling and installation. The number of operators has been reduced to 2, reducing the probability of accidents during cross-operations. At the same time, a safety rope fixing device is used to eliminate the risk of falling.

[0033] Outstanding economic benefits: By modifying existing impactors, the cost of a single unit is only RMB 1,200 to RMB 1,600 (compared to RMB 12,000 to RMB 14,000 for traditional hydraulic equipment), reducing direct costs by 90%; there are no problems such as oil leakage or blockage in the hydraulic system, resulting in a low failure rate and convenient maintenance; labor costs are reduced by 50%, and overall construction costs are reduced by more than 30%;

[0034] Wide range of applications: Suitable for various geological conditions such as soil slopes, fractured rock layers, and gravel layers; can remove various types of pipes such as anchor bolts, anchor bundles, and drainage holes; compatible with common pipes with diameters of 90-150mm; also suitable for narrow or complex flexible construction scenarios such as high slopes, foundation pits, and tunnels.

[0035] Environmentally friendly and energy-saving: It only requires compressed air to drive, with no hydraulic oil consumption, and features green and low-carbon construction characteristics; noise and vibration are controllable, with minimal impact on the surrounding environment.

Claims

1. A device for extracting a pipe from a pipe-in-pipe installation, the device comprising a striker, characterised in that: The rear end of the impactor is welded and fixed to the tube shoe by four axially symmetrically arranged connecting steel bars, and the tube shoe has connecting threads that match the support heel pipe.

2. The slope shallow support pipe pulling device according to claim 1, characterized in that: The air supply pipe of the impactor is led out from between the connecting steel bars and connected to the air supply equipment.

3. The slope shallow support pipe pulling device according to claim 1, characterized in that: The pipe-pulling device is suspended from the slope scaffolding by at least two steel wire ropes.

4. The slope shallow support pipe pulling device according to claim 1, characterized in that: The impactor is a down-the-hole drill impactor.

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