Leaking stoppage device for pipe jacking through pulling and jacking method

Abstract

The utility model relates to a leaking stoppage device for pipe jacking through a pulling and jacking method. The leaking stoppage device comprises an orifice pipe, a first flange, a sealing insertion plate, a drill bit replacement pipe, a second flange, an outer sleeve, an inner sleeve and a drill rod. The utility model has the beneficial effects that through the sealing insertion plate, the drill rod is automatically pulled out during drilling, so that the drill rod is ensured to pass through smoothly; when the drill rod is pulled out, the drill rod is reset, orifices on the two sides are effectively separated, and water or other fluid in an undisturbed soil area is prevented from leaking out. According to the dynamic sealing mechanism, the sealing performance in the construction process is remarkably improved, and the geological environment problem and the construction difficulty possibly caused by fluid leakage are reduced. In addition, due to the packing arranged in the outer sleeve and the use of multiple layers of flanges, the sealing performance of the whole system is further enhanced.

Description

Technical Field

[0001] The utility model relates to the field of pipe jacking construction, in particular to a leak-proof device for pipe jacking using a pulling-top method. Background Art

[0002] In pipe jacking construction, the pulling-up method is often used for jacking due to insufficient recoil, and the installation of the pull cable is usually carried out by horizontal directional drilling. After heavy rain, the groundwater level rises, and sand and water gushing are prone to occur during horizontal hole directional drilling. In order to avoid this risk, a blowout preventer must be installed at the hole mouth before drilling. The hole mouth blowout preventer can ensure that the danger of sand and water gushing does not occur during the horizontal hole drilling process. Due to the presence of reinforced soil around the pipe jacking working shaft, the drill bit needs to be replaced frequently during the construction of the horizontal directional drilling rig. The outer diameter of the directional drilling drill bit is larger, and the outer diameter of the drill rod is smaller. When the drill bit is pulled out and enters the hole mouth blowout preventer, there is a greater risk of water and sand gushing, and it will also affect the water-stopping effect of the sealing material.

[0003] The horizontal directional drilling (HDD) blowout prevention system and its assembly and disassembly method utilize multiple clamping devices. These devices switch the sealing state of each clamping device to ensure safe withdrawal of the HDD. However, these multiple clamping devices increase the overall length of the blowout prevention system, making them unsuitable for projects with limited space. Utility Model Content

[0004] The purpose of the utility model is to overcome the shortcomings of the prior art and provide a plugging device for pipe jacking by a pull-up method, comprising: an orifice pipe, a first flange, a sealing insert, a drill bit replacement pipe, a second flange, an outer casing, an inner casing and a drill rod;

[0005] In which, the orifice pipe penetrates into the soil layer of the reinforced area; one end of the orifice pipe is connected to the drill bit replacement pipe through the first flange, and a drill bit is arranged in the drill bit replacement pipe; the sealing plug plate is inserted in the middle of the first flange; the end of the drill bit replacement pipe away from the orifice pipe is connected to the outer casing through the second flange; the inner casing is inserted into the outer casing, and the drill rod is inserted into the inner casing.

[0006] Preferably, a third flange is further included; the third flange is used to connect the outer sleeve and the inner sleeve.

[0007] Preferably, the drill rod is a drill rod of a horizontal directional drilling rig; when the drill rod drills in, the sealing plug plate will be pulled outward, so that the holes on both sides of the sealing plug plate are connected to each other; when the drill rod is pulled out, the sealing plug plate will be reset to isolate the holes on both sides of the sealing plug plate.

[0008] Preferably, it further comprises packing; the packing is provided in a hole at one end of the outer sleeve close to the second flange.

[0009] Preferably, a ball valve is further included; a protruding hole is provided in the middle of the drill bit replacement tube, and a ball valve is provided at the protruding hole for controlling the water pressure balance of the original soil area.

[0010] The beneficial effects of the utility model are:

[0011] 1. This utility model utilizes a sealing insert that automatically pulls outward during drilling, ensuring smooth penetration. Upon withdrawal, the insert returns to its original position, effectively isolating the two side openings and preventing the leakage of water or other fluids from the undisturbed soil area. This dynamic sealing mechanism significantly improves sealing performance during construction, reducing the potential geological and environmental issues and construction difficulties caused by fluid leakage. Furthermore, the use of packing within the outer sleeve and multi-layer flanges further enhances the sealing of the entire system.

[0012] 2. The utility model is designed with a detachable drill bit replacement tube, so when the drill bit needs to be replaced, there is no need to pull the entire device out of the soil layer. It is only necessary to remove and replace the drill bit in the drill bit replacement tube, which greatly simplifies the operation process, shortens the replacement time, and improves construction efficiency.

[0013] 3. The ball valve installed in the drill bit replacement tube of this utility model can accurately control the water pressure balance in the undisturbed soil area. This design not only ensures the safe progress of the project and prevents geological disasters caused by sudden changes in water pressure, but also reduces construction interruptions caused by water pressure issues, thereby improving construction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is an overall schematic diagram of the horizontal directional drilling hole blowout prevention device for pipe jacking using the pull-jacking method;

[0015] Figure 2 This is a cross-sectional view of a blowout prevention device for horizontal directional drilling using the pull-jack method;

[0016] Explanation of the accompanying reference numerals: 1. Orifice pipe, 2. Flange, 3. Sealing plate, 4. Drill bit replacement tube, 5. Ball valve, 6. Flange, 7. Outer casing, 8. Inner casing, 9. Packing, 10. Flange, 11. Drill pipe. DETAILED DESCRIPTION

[0017] The present invention will be further described below with reference to the following embodiments. The following embodiments are provided solely to facilitate understanding of the present invention. It should be noted that, within the scope of the present invention, modifications may be made by a person skilled in the art without departing from the principles of the present invention. Such improvements and modifications are also within the scope of the claims of the present invention.

[0018] As an example, Figure 1 and Figure 2As shown, the present application provides a plugging device for pipe jacking by the pull-jacking method, comprising: an orifice pipe 1, a first flange 2, a sealing insert 3, a drill bit replacement pipe 4, a second flange 6, an outer casing 7, an inner casing 8 and a drill rod 11;

[0019] The orifice pipe 1 is a 159mm diameter steel pipe that extends deep into the soil layer of the reinforced area. One end of the orifice pipe 1 is connected to the drill bit replacement pipe 4 via the first flange 2. The orifice of the drill bit replacement pipe 4 has a 150mm diameter and houses a drill bit. The sealing insert 3 is inserted in the middle of the first flange 2. The end of the drill bit replacement pipe 4, away from the orifice pipe 1, is connected to the outer sleeve 7 via the second flange 6. The outer sleeve 7 has a 149mm diameter, which accommodates the inner sleeve 8. A 12mm thick packing 9 is installed in the hole at the end of the outer sleeve 7 near the second flange 6 to prevent water from flowing out along the drill pipe, further ensuring the safety and sealing of the project. The inner sleeve 8 has an outer diameter of 149mm and an inner diameter of 121mm. The inner sleeve 8 is inserted into the outer sleeve 7, and the drill pipe 11 is inserted into the inner sleeve 8.

[0020] In addition, a third flange 10 is included; the third flange 10 is used to connect the outer sleeve 7 and the inner sleeve 8.

[0021] The drill rod 11 is a drill rod of a horizontal directional drilling rig; when the drill rod 11 is drilled, the sealing plate 3 will be pulled outward, so that the holes on both sides of the sealing plate 3 are connected to each other; when the drill rod 11 is pulled out, the sealing plate 3 will be reset, and the holes on both sides of the sealing plate 3 will be isolated, effectively preventing water from leaking out of the original soil area, and ensuring the sealing of the project. After the sealing plate 3 isolates the holes on both sides, the drill bit replacement tube 4 is removed and the drill bit in the tube is replaced. After the replacement is completed, the drill bit replacement tube 4 is reinstalled. The present application realizes the replacement of the drill bit by disassembling the drill bit replacement tube 4 without affecting the sealing material, avoiding the risk of water spraying and sand gushing when the drill tool is pulled out and enters the orifice blowout preventer.

[0022] A protruding hole is provided in the middle of the drill bit replacement pipe 4, and a ball valve 5 is provided at the protruding hole to control the water pressure balance of the original soil area to ensure the safe progress of the project.

Claims

1. A leak plugging device for pipe jacking using the pull-up method, characterized in that: include: Orifice pipe (1), first flange (2), sealing insert (3), drill bit replacement pipe (4), second flange (6), outer casing (7), inner casing (8) and drill pipe (11); The orifice pipe (1) penetrates deep into the soil layer of the reinforcement area; one end of the orifice pipe (1) is connected to the drill bit replacement pipe (4) through the first flange (2), and a drill bit is provided in the drill bit replacement pipe (4); the sealing insert (3) is inserted in the middle of the first flange (2); the end of the drill bit replacement pipe (4) away from the orifice pipe (1) is connected to the outer sleeve (7) through the second flange (6); the inner sleeve (8) is inserted into the outer sleeve (7), and the drill rod (11) is inserted into the inner sleeve (8).

2. The leak-proof device for pipe jacking by the pulling-up method according to claim 1, characterized in that: It also includes a third flange (10); the third flange (10) is used to connect the outer sleeve (7) and the inner sleeve (8).

3. The leak-proof device for pipe jacking by the pulling-up method according to claim 2, characterized in that: The drill rod (11) is a drill rod of a horizontal directional drilling rig; when the drill rod (11) is drilled, the sealing plug plate (3) is pulled outward, so that the holes on both sides of the sealing plug plate (3) are connected to each other; when the drill rod (11) is pulled out, the sealing plug plate (3) is reset, and the holes on both sides of the sealing plug plate (3) are isolated.

4. The leak-proof device for pipe jacking by the pulling-up method according to claim 3, characterized in that: It also includes a packing (9); a packing (9) is provided in a hole at one end of the outer sleeve (7) close to the second flange (6).

5. The leak-proof device for pipe jacking by the pulling-up method according to claim 4 is characterized in that: It also includes a ball valve (5); a protruding hole is provided in the middle of the drill bit replacement tube (4), and a ball valve (5) is provided at the protruding hole for controlling the water pressure balance of the original soil area.

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