Automatic water stopping device for tunnel pipeline drilling mechanism

Abstract

The automatic water stopping device for the tunnel pipeline drilling mechanism comprises a cylinder, an expansion ring, a sealing ring and a semi-ring plate, the sealing ring and the expansion ring are arranged in an inner cavity of the cylinder, the semi-ring plate is arranged between the sealing ring and the expansion ring, and a drill rod channel is formed in the middle of the cylinder; when underground water permeates along the surface of the drill pipe in the rotary drilling motion of the drill pipe, the expansion ring made of the water absorption expansion material expands when meeting water and extrudes the sealing ring, so that the inner ring surface of the sealing ring tightly presses the surface of the drill pipe, and automatic sealing of water leakage is achieved. According to the invention, automatic sealing is realized by utilizing the characteristic that the material swells when encountering water; the expansion material can be recycled, so that the cost is reduced.

Description

Technical Field

[0001] The invention relates to an automatic sealing water leakage device for segment drilling operation, in particular to a water-stopping sealing device for preventing water leakage when drilling holes to the outside of a tunnel or a pipeline for sampling. Background Art

[0002] During the life-cycle maintenance of shield segments, local areas will be reinforced with back-wall grouting after non-destructive detection. Sometimes, when grouting is performed in the reserved grouting hole in the center of the segment, it is difficult for the slurry to flow well to the area far away from the hole. At this time, it is necessary to drill holes near the defective area and grout at close range to solve this problem. Another working condition is that anchor rods need to be added to the segment to stabilize the settlement and deformation of the tunnel, which also requires drilling holes in the segment.

[0003] When drilling in a soil layer with a high groundwater level, groundwater will flow into the tunnel along the surface of the drill pipe under pressure. The impact is particularly significant when the water pressure is high. Therefore, a seepage-proof and water-stopping sealing device is needed to block the leakage of groundwater along the surface of the drill pipe. Summary of the invention

[0004] In order to solve the above technical problems, the purpose of the present invention is to provide an automatic water stopping device for a tunnel pipe drilling mechanism.

[0005] To achieve the above-mentioned purpose, the technical solution of the present invention is: an automatic water-stopping device for a tunnel pipe drilling mechanism, comprising a cylindrical tube, an expansion ring, a sealing ring, and a semi-ring plate. The sealing ring and the expansion ring are arranged in the inner cavity of the cylindrical tube, a semi-ring plate is arranged between the sealing ring and the expansion ring, and the middle of the cylindrical tube is a drill pipe channel; during the rotary drilling movement of the drill pipe, when groundwater penetrates along the surface of the drill pipe, the expansion ring made of water-absorbing and swelling material expands when it encounters water, squeezing the sealing ring so that the inner ring surface of the sealing ring is pressed against the surface of the drill pipe, thereby realizing automatic sealing of water leakage.

[0006] Furthermore, the cylindrical tube is made of metal, and a flange is provided at the front end for connecting a ball valve or an expansion tube, and a concentric cavity is provided on the inner surface for accommodating an expansion ring and a sealing ring.

[0007] Furthermore, the expansion ring is made of a water-absorbing and expanding material, which is made of a high molecular polymer and can expand in volume when it comes into contact with water.

[0008] Furthermore, the expansion ring is a hollow cylindrical structure, placed in the inner concave cavity of the cylindrical barrel; its inner surface contacts the semi-ring plate, and its outer diameter is greater than or equal to the inner concave cavity diameter of the cylindrical barrel.

[0009] Furthermore, the sealing ring is made of polyurethane and has a circular disc structure. Multiple sealing rings are arranged in a group, the outer surface is in contact with the semi-ring plate, and the diameter of the inner surface is slightly larger than the outer diameter of the drill pipe. A series of sizes are set according to the different outer diameters of the drill pipe for deployment.

[0010] Furthermore, the semi-ring plate is made of tetrafluoroethylene, has a cylindrical sheet structure, and two sheets form a group, and is located between the expansion ring and the sealing ring.

[0011] The beneficial effects of the present invention are:

[0012] (1) Automatic sealing is achieved by utilizing the material's own water expansion characteristics;

[0013] (2) The expansion material can be recycled, reducing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the automatic water-stopping device for a tunnel pipe drilling mechanism of the present invention when it is working;

[0015] Figure 2 It is a structural schematic diagram of the automatic water-stopping device for a tunnel pipe drilling mechanism of the present invention;

[0016] Figure 3 This is a relationship diagram between the immersion time and water absorption rate of the water-swelling material;

[0017] Figure 4 This is a graph showing the relationship between the water absorption time and water absorption rate of a water-swellable material. DETAILED DESCRIPTION

[0018] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0019] like Figure 2 As shown, a sealing device for sealing water seepage on the surface of a drill pipe during the rotary drilling movement of the drill pipe is composed of a cylindrical tube 1, an expansion ring 2, a sealing ring 3, a semi-ring plate 4, etc.

[0020] The inner cavity of the cylindrical tube 1 is provided with a sealing ring 3 and an expansion ring 2, and a semi-ring plate 4 is provided between the sealing ring 3 and the expansion ring 2, with a drill pipe passage in the middle. When groundwater infiltrates along the surface of the drill pipe 5 during the drilling movement of the drill pipe, the expansion ring made of water-absorbing and expanding material expands when it encounters water, squeezes the sealing ring 3, and makes the inner ring surface press against the surface of the drill pipe 5, so as to achieve the purpose of automatically sealing water leakage.

[0021] The cylindrical tube 1 is made of metal and has a flange at the front end for connecting other components, such as a ball valve 7, an expansion tube 6, etc.; a concentric cavity is provided on its inner surface for accommodating an expansion ring 2, a sealing ring 3, etc.

[0022] The expansion ring 2 is a water-absorbing and swelling material, usually a high molecular polymer, which can expand in volume when exposed to water. It is made into a hollow cylindrical part and placed in the inner concave cavity of the cylinder 1; its inner surface is in contact with the semi-ring plate 4, and its outer diameter is the same as (or slightly larger than) the diameter of the concave cavity; water-absorbing and swelling materials (such as polyacrylate copolymer (PAAc for short) and polyacrylic acid amide (PAN for short) etc.) absorb water quickly, expand to a large extent, and have high stability, which depends on their chemical composition, microstructure and expansion mechanism and other factors, see Figure 3 , 4.

[0023] The sealing ring 3 is a polyurethane, annular disc-shaped part, a plurality of which are arranged in parallel as a group, the outer surface of which contacts the semi-ring plate 4, and the diameter of the inner surface is slightly larger than the outer diameter of the drill pipe. It can be set as a series of sizes according to the different outer diameters of the drill pipe and used in combination.

[0024] The semi-ring plate 4 is made of tetrafluoroethylene, a cylindrical sheet-like part, two pieces form a group, and is located between the expansion ring 2 and the sealing ring 3 .

[0025] This embodiment is attached Figure 1 The present invention is described by taking the structural form as an example.

[0026] Drill holes at designated positions on the shield segments, then place expansion tubes, then install the device of the present invention on the expansion tubes, then install the ball valves, and fasten them with bolts through the bolt holes of the cylindrical tube 1. Pass the drill pipe through the central hole to complete the preparations for drilling and connection. Start the drill rod. When the drill rod drills through the segments, groundwater penetrates into the interior along the surface of the drill rod. When external water flows into the permeable channels inside the cylindrical tube 1 and then flows to the expansion ring 2, the expansion ring 2 expands due to the characteristics of the material, that is, it swells when it encounters water, so that its inner annular surface squeezes the semi-ring plate 4, and then squeezes the sealing ring 3, and then squeezes on the surface of the drill rod. Therefore, under the pressure generated by the expansion, the external inflowing water cannot continue to flow there, thereby achieving a sealing effect of anti-seepage and water-stopping.

Claims

1. An automatic water stopping device for a tunnel pipe drilling mechanism, characterized in that: It includes a cylindrical tube, an expansion ring, a sealing ring and a semi-ring plate. The sealing ring and the expansion ring are arranged in the inner cavity of the cylindrical tube, a semi-ring plate is arranged between the sealing ring and the expansion ring, and the middle of the cylindrical tube is a drill pipe channel. When the drill pipe rotates and drills, when groundwater penetrates along the surface of the drill pipe, the expansion ring made of water-absorbing and expanding material expands when it meets water, squeezes the sealing ring, so that the inner ring surface of the sealing ring is pressed against the surface of the drill pipe, thereby realizing automatic sealing of water leakage.

2. The automatic water stopping device for tunnel pipe drilling mechanism according to claim 1 is characterized in that: The cylindrical tube is made of metal and has a flange at the front end for connecting a ball valve or an expansion tube. A concentric cavity is provided on the inner surface for accommodating an expansion ring and a sealing ring.

3. The automatic water stopping device for tunnel pipe drilling mechanism according to claim 1 is characterized in that: The expansion ring is made of a water-absorbing and expanding material, which is made of a high molecular polymer and can expand in volume when it comes into contact with water.

4. The automatic water stopping device for tunnel pipe drilling mechanism according to claim 1 is characterized in that: The expansion ring is a hollow cylindrical structure and is placed in the inner concave cavity of the cylinder; Its inner surface contacts the semi-ring plate, and its outer diameter is greater than or equal to the inner concave cavity diameter of the cylindrical barrel.

5. The automatic water stopping device for tunnel pipe drilling mechanism according to claim 1 is characterized in that: The sealing ring is made of polyurethane and has a circular disc structure. Multiple sealing rings are arranged in a group. The outer surface contacts the semi-ring plate. The diameter of the inner surface is larger than the outer diameter of the drill pipe. A series of sizes are set according to the different outer diameters of the drill pipe for deployment and use.

6. The automatic water stopping device for tunnel pipe drilling mechanism according to claim 1 is characterized in that: The semi-ring plate is made of tetrafluoroethylene, has a cylindrical sheet structure, and is a group of two plates, and is located between the expansion ring and the sealing ring.

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