Device and method for pulling out PVC (polyvinyl chloride) sleeve in hole

Abstract

The invention discloses a device and a method for pulling out a PVC (polyvinyl chloride) sleeve in a hole. In urban rail transit karst special investigation, it is very important to pull out a PVC sleeve in a drill hole. The device comprises a drilling machine, and a drilling rod on the drilling machine is arranged in a PVC sleeve; the PVC sleeve is arranged in the hole wall of the drill hole; the bottom end of the drill rod is connected with a lifting head; an iron wire is wound on the lifting head; and the space between the lifting head and the inner wall of the PVC sleeve is filled with melon-shaped stone. According to the method, the pulling capacity is high, the lifting head wound with the waste iron wires and the surrounding PVC casing pipes are in a complete tight holding state by throwing the papaya stone, and then the PVC casing pipes are lifted together through the high lifting force of the lifting winch of the drilling machine.

Description

Technical Field

[0001] The invention belongs to the technical field of karst special exploration, and particularly relates to a device and method for removing a PVC casing in a hole. Background Art

[0002] In special karst surveys for urban rail transit, it is often necessary to conduct CT tests between two adjacent completed boreholes to identify the karst development between the two holes. To ensure that the geophysical testing equipment can be smoothly retracted and deployed in the hole, a PVC protective casing corresponding to the borehole depth must be lowered into the existing borehole before the on-site CT test. After the on-site CT test is completed, all PVC casings in the hole must be removed to avoid affecting the quality of subsequent cement mortar backfill and sealing. In order to prevent enriched groundwater from overflowing along the borehole pipe and polluting the ground environment during subway construction excavation, or surface rivers and other water bodies from flowing down the existing borehole, endangering the safety of tunnel construction and operation, it is extremely important to completely remove the PVC casing in the borehole.

[0003] Currently, there are two main methods for extracting PVC casing: 1. Direct extraction using a winch on the drill rig, and 2. Portable pipe pullers. The basic principle of both methods is to secure the top of the PVC casing, which is several dozen meters long, with a noose or calipers, and then apply strong force to completely remove the PVC casing from the hole. With this extraction method, the success rate of the extraction is highly dependent on the crew's ability to ensure the quality of the adhesive used when installing the PVC casing in the hole and their ability to apply uniform force when pulling out the drill. In silty soils or sandy soils with abundant groundwater, after drilling and inserting the PVC casing, the hole is prone to shrinkage and collapse due to the formation's characteristics, significantly increasing the friction between the PVC casing and the hole wall. If the PVC casing breaks at a weak point in the middle, subsequent recovery of the remaining PVC casing using core barrels or drill pipe is extremely difficult, time-consuming, and labor-intensive. A large amount of debris and debris will also remain in the hole, significantly affecting the quality of the backfill.

[0004] While portable pipe pullers offer numerous advantages, such as being small, lightweight, and suitable for use on busy roads, they require a high level of site flatness. Furthermore, under the strong pulling force, the pipe puller's clamps can significantly deform the PVC casing, ultimately causing the clamps to fall off. Furthermore, even if the portable pipe puller is used to completely remove the PVC casing, a drill rig still needs to be deployed to backfill and seal the hole, making the actual operation more complex, time-consuming, and labor-intensive. Therefore, it is crucial to develop a pipe pulling device or method with a scientific principle, convenient operation, and a high success rate. Summary of the Invention

[0005] In order to make up for the shortcomings of the existing technology, the present invention provides a device and method for removing PVC casing in a hole. The equipment and materials for assembling the device are convenient and easy to obtain, and the operation is simple, and the PVC casing can be smoothly pulled out from the bottom of the hole.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is: A device for removing PVC casing in a hole, specifically: The invention comprises a drilling rig, wherein a drill rod on the drilling rig is arranged inside a PVC casing; the PVC casing is arranged inside a borehole wall; The bottom end of the drill rod is connected to a lifting head; The lifting head is wound with iron wire; The space between the lifting head and the inner wall of the PVC casing is filled with guami stone.

[0007] Furthermore, the drilling rig is arranged above the drill hole.

[0008] Furthermore, the drill rod and the PVC casing are coaxially arranged.

[0009] Furthermore, the lifting head is arranged at the bottom of the PVC sleeve.

[0010] Furthermore, the gap between the lifting head and the PVC sleeve is 4-6 mm.

[0011] Furthermore, the filling height of the guami stone is 3 to 5 m.

[0012] Furthermore, the lifting head is an abandoned dynamic sounding probe.

[0013] A method for removing a PVC casing from a hole comprises the following steps: Step 1: Connect the end of the drill pipe to the lifting head, and then wrap the scrap wire around the surface of the lifting head to ensure that the wire does not slip off; Step 2: Connect the drill rods one by one and lower the lifting head tied with scrap wire from the inside of the PVC casing to the bottom of the pipe; Step 3: Grab a few handfuls of guami stone and drop them into the PVC casing through the gap between the drill pipe and the PVC pipe wall; Step 4: Operate the drilling rig to pull out the drill pipe and remove the pipe, ensuring that the drill pipe and PVC casing rise synchronously.

[0014] Beneficial effects of the present invention: 1) The present invention has a strong pulling capability. By throwing melon stones, the lifting head wrapped with waste iron wire and the surrounding PVC casing are completely locked together. The strong lifting force of the hoisting winch of the drilling rig is then used to lift the PVC casing up by the root. The drilling rig is powered by a diesel engine, and the hydraulic system applies upward tension, downward pressure, and torsional force to the drill rod in the borehole. Its pulling capability far exceeds that of various portable pipe pulling devices on the market. 2) The present invention changes the extraction method from the traditional "pulling from the top" to "lifting from the root." The force between the individual pipes is mainly the thrust generated by mutual squeezing, which no longer places excessive pressure on the quality of the glue bonding between the PVC pipes. This significantly improves the consistency and success rate of the extraction. 3) The present invention utilizes conventional machinery and materials used in exploration, including drilling rigs, drill pipes, discarded dynamic penetration probes, waste iron wire, melon stones, and hacksaws. No other uncommon equipment and materials are required, resulting in low cost and ease of implementation. 4) The pipe pulling device of the present invention has strong environmental adaptability and can be used on various surfaces such as farmland, depressions, and water surfaces. Unlike existing pipe pulling devices on the market, such as pipe pulling tools, which have high requirements for surface hardness and flatness; 5) After the pipe pulling operation is completed using the present invention, the cement mortar sealing operation can be carried out continuously, thus avoiding the adverse effects of repeated entry of personnel and equipment, and improving process continuity. In contrast, after the pipe pulling operation is completed, the current pipe pulling device on the market still requires the drilling rig to enter the site and use the drilling rig pump pipe to backfill the hole with cement mortar. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 This is an enlarged schematic diagram of the bottom of the present invention; In the figure, 1-drilling rig, 2-drill rod, 3-drill hole wall, 4-PVC casing, 5-lifting head, 6-waste wire, 7-guami stone. DETAILED DESCRIPTION

[0016] The present invention will be described in detail below with reference to specific embodiments.

[0017] The present invention throws melon stones to make the lifting head wrapped with waste iron wire and the surrounding PVC casing in a completely tight state. The pipe pulling idea is changed from the traditional "pulling from the top" to "lifting from the root". The force between single pipes is mainly the thrust formed by mutual squeezing, and the glue bonding quality between PVC pipes is no longer excessively tested, so the continuity and success rate of pipe pulling are significantly improved; then, the strong lifting force of the drilling rig hoisting winch is used to lift the PVC casing by the root, and the pulling ability is strong.

[0018] like Figure 1 As shown, the PVC casing extraction device of the present invention includes a drill rig 1, which is arranged above the drill hole. After the pipe extraction operation is completed, the drill rig can be used to continuously perform the cement mortar sealing operation, thereby avoiding the adverse effects of repeated entry of personnel and equipment, and improving the process continuity. The drill rod 2 on the drilling rig 1 is arranged inside the PVC casing 4, and the drill rod 2 and the PVC casing 4 are arranged coaxially; the PVC casing 4 is arranged inside the borehole wall 3; like Figure 2 As shown, the bottom end of the drill pipe 2 is connected to a lifting head 5, and a wire 6 is wound around the lifting head 5. The lifting head 5 is set at the bottom of the PVC casing 4; the space between the lifting head 5 and the inner wall of the PVC casing 4 is filled with melon stone 7, and the filling height of the melon stone 7 is 3~5m; the gap between the lifting head 5 and the PVC casing 4 is 4-6mm; In this example, the lifting head 5 adopts a discarded dynamic sounding probe, which is easy to obtain and low in cost.

[0019] The present invention also provides a method for removing the PVC casing in a hole, and the operation method is as follows: Step 1: Connect the end of the drill rod 2 to the lifting head 5, and then wrap the scrap wire 6 around the surface of the lifting head 5 several times to avoid being too loose or too tight to ensure that the wire does not slip off; Step 2: Connect the drill rods 2 one by one, and lower the lifting head 5 tied with waste wire 6 from the inside of the PVC casing 4 to the bottom of the pipe; Step 3: Grab a few handfuls of melon stones 7 and throw them into the PVC casing 4 through the gap between the drill pipe 2 and the PVC pipe wall. The estimated filling height is about 3-5m. Step 4: Operate the drilling rig 1 to pull out the drill pipe and remove the pipe, ensuring that the drill pipe 2 and the PVC casing 4 basically rise synchronously; during the pipe removal process, carefully observe the synchronization of the rise of the PVC casing 4 and the drill pipe 2. If the rise of the PVC casing 4 is not synchronous with the rise of the drill pipe 2, stop the pipe removal operation, refill the PVC casing 4 with the melon stone 7, and then operate the drilling rig 1 to pull out the drill pipe and remove the pipe.

[0020] In the description of the present invention, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they may refer to fixed or detachable connections, or integration; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention in specific contexts.

[0021] The content of the present invention is not limited to the embodiments listed. Any equivalent transformation of the technical solution of the present invention made by ordinary technicians in this field after reading the description of the present invention is covered by the claims of the present invention.

Claims

1. A device for removing PVC casing in a hole, characterized by: It comprises a drilling rig (1), wherein a drill rod (2) on the drilling rig (1) is arranged inside a PVC casing (4); the PVC casing (4) is arranged inside a borehole wall (3); The bottom end of the drill rod (2) is connected to a lifting head (5); The lifting head (5) is wound with an iron wire (6); The space between the lifting head (5) and the inner wall of the PVC sleeve (4) is filled with melon stone (7).

2. The in-hole PVC casing removal device according to claim 1, characterized in that: The drilling rig (1) is arranged above the drill hole.

3. The in-hole PVC casing removal device according to claim 2, characterized in that: The drill rod (2) and the PVC casing (4) are coaxially arranged.

4. The in-hole PVC casing removal device according to claim 3, characterized in that: The lifting head (5) is arranged at the bottom of the PVC sleeve (4).

5. The in-hole PVC casing removal device according to claim 4, characterized in that: The gap between the lifting head (5) and the PVC sleeve (4) is 4-6 mm.

6. The in-hole PVC casing removal device according to claim 5, characterized in that: The filling height of the melon stone (7) is 3 to 5 m.

7. The in-hole PVC casing removal device according to claim 6, characterized in that: The lifting head (5) is a discarded dynamic sounding probe.

8. A method for removing a PVC casing from a hole, characterized by: The steps include: Step 1: Connect the end of the drill rod (2) to the lifting head (5), and then wrap the waste wire (6) around the surface of the lifting head (5) to ensure that the wire does not slip; Step 2: Connect the drill rods (2) one by one, and lower the lifting head (5) tied with waste wire (6) from the inside of the PVC casing (4) to the bottom of the pipe; Step 3: Grab a few handfuls of melon stones (7) and put them into the PVC casing (4) through the gap between the drill rod (2) and the PVC pipe wall; Step 4: Operate the drilling rig (1) to pull out the drill and remove the pipe, ensuring that the drill rod (2) and the PVC casing (4) rise synchronously.

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