Anti-leakage device for pipe jacking starting portal

Abstract

The utility model discloses a pipe jacking starting tunnel portal anti-seepage device which comprises a steel plate ring fixed to the peripheral side of a tunnel portal, the steel plate ring stretches out towards the interior of the tunnel portal, water stopping curtain cloth is arranged on the side, facing the jacking direction, of the steel plate ring, and a closed space is jointly defined by the water stopping curtain cloth, the steel plate ring and the side wall of a pipe piece. A plurality of grouting ball valves are fixed to the steel plate ring in the circumferential direction at intervals and used for injecting anti-seepage materials into the closed space. The steel plate ring and the water stop curtain cloth are arranged on the peripheral side of the tunnel portal, then the closed space is formed on the peripheral side of the tunnel portal, the impermeable material is injected into the closed space through the grouting ball valve, water seepage prevention of the tunnel portal can be achieved, the impermeable material can be reinjected into the area with the poor impermeable effect through the grouting ball valve, and the device is simple in structure, convenient to operate and low in cost. Installation is fast and convenient, and the anti-seepage effect is good.

Description

Technical Field

[0001] The utility model belongs to the technical field of pipe jacking construction, and particularly relates to a leakage prevention device for a starting tunnel of a pipe jacking. Background Art

[0002] Pipe jacking is a trenchless pipe laying technique used in municipal construction. Within the working pit, the jacking force generated by the jacking equipment overcomes the friction between the pipe and the surrounding soil, pushing the pipe segments into the soil according to the designed slope and removing the soil. Pipe jacking has minimal impact on the surrounding environment, requires a small construction site, is quiet, and allows deep underground operations.

[0003] If there is groundwater in the stratum of the jacking line, water leakage from the tunnel portal is likely to occur during the jacking process, that is, groundwater leaks and flows out from the gap between the jacking pipe and the tunnel portal, thereby affecting the construction environment and causing construction hazards.

[0004] Geotextiles or sponges and other absorbent materials are usually used to seal the gap between the portal and the jacking pipe. However, since the pipe section at the portal position is constantly moving forward during the jacking process, the use of geotextiles or sponges can easily cause the geotextiles or sponges to be brought in between the pipe section and the soil layer, losing the ability to seal the portal and increasing the resistance during the jacking process. Utility Model Content

[0005] The utility model provides a device for preventing water from seeping out of a tunnel door during tunneling in a jacking construction.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0007] A device for preventing leakage of a tunnel portal for a jacking pipe, comprising a steel plate ring fixed to the periphery of the tunnel portal and extending into the tunnel portal, a water-stop curtain being provided on the side of the steel plate ring facing the jacking direction, the water-stop curtain, the steel plate ring, and the side wall of the pipe segment together forming a closed space;

[0008] A plurality of grouting ball valves are fixed at intervals in the circumferential direction of the steel plate ring, and the grouting ball valves are used to inject anti-seepage material into the enclosed space.

[0009] Furthermore, a folding plate is provided between the water-stop curtain and the steel plate ring, and the surface of the folding plate is parallel to and close to the surface of the water-stop curtain.

[0010] Furthermore, the anti-seepage material is a mixture of water glass and phosphoric acid.

[0011] Furthermore, the inner ring diameter of the steel plate ring is 1 mm larger than the outer diameter of the pipe segment.

[0012] Furthermore, a circumferential rubber strip is fixed to the inner ring edge of the steel plate ring, and the steel plate ring is installed behind the tunnel door, and the circumferential rubber strip is located on the side of the steel plate ring facing the hinged plate.

[0013] Furthermore, it further comprises a first anchor and a second anchor, wherein a plurality of through holes are spaced apart on the steel plate ring, and a diameter of the second anchor is smaller than a diameter of the through holes;

[0014] The first anchor is anchored to the tunnel portal after passing through the steel plate ring, the water-stop curtain and the folding plate, and the second anchor is anchored to the tunnel portal after passing through the water-stop curtain and the folding plate.

[0015] Furthermore, the grouting ball valves are arranged at intervals of 1.5 m, and the grouting ball valves are of a 50 mm specification.

[0016] Furthermore, the water-stop curtain is made of rubber material, and the folding plate is made of steel or iron.

[0017] Furthermore, the folding plate and the water-stop curtain both include a fixed portion and a bent portion, the fixed portion is stacked and fixed to the end face of the tunnel portal, the bent portion is bent toward the space between the tunnel portal and the inner wall of the pipe segment, and the free end of the bent portion is in contact with the outer wall of the pipe segment.

[0018] The utility model can achieve the following beneficial effects:

[0019] 1. The present application forms a closed space around the tunnel portal by arranging a steel plate ring and a water-stop curtain on the side of the tunnel portal, and injects anti-seepage material into the closed space through a grouting ball valve, thereby achieving water-proofing of the tunnel portal. For areas with poor anti-seepage effect, anti-seepage material can also be supplemented through the grouting ball valve. The device of the present application has a simple structure, is quick and easy to install, and has a good anti-seepage effect.

[0020] 2. After the jacking construction is completed, the steel ring plate of this application can continue to be installed on the tunnel portal to reduce soil erosion at the tunnel portal location, ensure the stability of the stratum at the tunnel portal location, and reduce construction safety risks.

[0021] 3. The installation of steel plate rings can limit the direction of excavation and ensure that the channel is pushed forward along the designed axis. In addition, the inner ring diameter of the steel plate ring is larger than the outer diameter of the pipe segment, which can reduce the friction between the steel plate ring and the pipe segment. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0023] Figure 1 This is an installation node diagram of a leakage prevention device for a jacking tunnel launch portal according to the utility model;

[0024] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0025] Figure 3 This is a front view of the hole door used to display the arrangement of the first anchor and the second anchor in the present invention.

[0026] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0027] 1. Steel plate ring; 11. Through hole; 2. Water-stop curtain; 21. Fixing part; 22. Bending part; 3. Grouting ball valve; 4. Folding plate; 5. Annular rubber strip; 6. First anchor; 7. Second anchor

[0028] 100. Tunnel gate; 200. Segment. DETAILED DESCRIPTION

[0029] To facilitate understanding of the present application, the present application will be described more fully below with reference to the accompanying drawings. The accompanying drawings provide embodiments of the present application. However, the present application may be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to make the disclosure of the present application more thorough and comprehensive.

[0030] like Figure 1 As shown, during pipe jacking construction, a starting working shaft is usually formed by vertical excavation from the ground downwards, a starting tunnel portal 100 is left on the side wall of the working shaft, and the pipe jacking construction is realized from the tunnel portal 100 into the stratum. In order to ensure the structural stability of the starting position and reduce the occurrence of earth collapse at the tunnel portal 100, a steel ring is usually embedded at the starting tunnel portal 100 and cast into one piece with the side wall of the working shaft for installing the water-stop curtain 2 and the folding plate 4.

[0031] The present application provides an anti-leakage device for a jacking starting tunnel portal, comprising a steel plate ring 1 fixed on the peripheral side of the tunnel portal 100. In the embodiment of the present application, a 5 mm thick steel plate ring 1 is used, the outer edge of the steel plate ring 1 is fixed on the tunnel portal 100, the inner edge is located inside the tunnel portal 100, and the aperture of the inner ring of the steel plate ring 1 is 1 mm larger than the outer diameter of the pipe segment 200.

[0032] Furthermore, a circumferential rubber strip 5 is fixed to the inner edge of the steel plate ring 1. When the steel plate ring 1 is installed in the tunnel portal 100, the circumferential rubber strip 5 is located on the side of the steel plate ring 1 facing the jacking direction. The circumferential rubber strip 5 seals the gap between the steel plate ring 1 and the outer wall of the pipe segment 200, preventing groundwater from leaking through the gap.

[0033] A water-stop curtain 2 and a folding plate 4 are also fixed on the tunnel portal 100. The water-stop curtain 2 and the folding plate 4 are both annular, and the water-stop curtain 2, the folding plate 4 and the steel plate ring 1 are arranged in sequence. The water-stop curtain 2 is directly attached to the tunnel portal 100, and the water-stop curtain 2, the folding plate 4 and the steel plate ring 1 are fixed to the tunnel portal 100 by multiple bolts.

[0034] The water-stop curtain 2 is made of rubber material, and the folding plate 4 is made of a hard material such as steel or iron. The water-stop curtain 2 and the folding plate 4 both include a fixed portion 21 and a bent portion 22. The fixed portion 21 is used to fix to the tunnel portal 100, and the bent portion 22 is bent toward the inner stratum. The free end of the bent portion 22 of the water-stop curtain 2 is in contact with the outer wall of the pipe segment 200. At the same time, the bent portion 22 of the water-stop curtain 2 is parallel to and in contact with the surface of the bent portion 22 of the folding plate 4. The water-stop curtain 2 is elastic and can be more closely attached to the outer wall of the pipe segment 200, thereby forming a closed space between the water-stop curtain 2, the steel plate ring 1, and the outer wall of the pipe segment 200. The folding plate 4 is hard, so that the folding plate 4 can support the water-stop curtain 2 without causing significant deformation, and can maintain the stability of the closed space.

[0035] The anti-leakage device of the present application can be installed after the tunnel door 100. During the construction process, Figure 1 The segment 200 is advanced in the direction indicated by the arrow, causing the segment 200 to move relative to the portal 100, thereby enabling the free end of the water-stop curtain 2 to closely contact the sidewall of the moving segment 200. It should be noted that the free end of the bent portion 22 of the hinged plate 4 does not need to contact the sidewall of the segment 200 to reduce friction during the movement of the segment 200.

[0036] Multiple grouting ball valves 3 are fixed at intervals along the circumference of the steel plate ring 1. Through these valves, an impermeable material, specifically a mixture of water glass and phosphoric acid, is injected into the enclosed space formed by the steel plate ring 1, the water-stop curtain 2, and the sidewalls of the segment 200. This impermeable material forms a jelly-like liquid, providing a waterproof seal. In this embodiment, a 50mm grouting ball valve 3 is installed every 1.5 meters on the steel plate ring 1 to meet grouting requirements.

[0037] The present application discloses a device for preventing leakage at the starting tunnel of a pipe jacking tunnel, which includes three levels of leakage protection. First, the first level of leakage protection is formed by the water-stop curtain 2 and the folding plate 4. Then, the second level of leakage protection is formed by the enclosed space formed between the water-stop curtain 2, the steel plate ring 1, and the side wall of the pipe segment 200. When the enclosed space is difficult to block the leakage water, the grouting ball valve 3 can be used to inject anti-seepage material into the enclosed space to achieve the third level of leakage protection. In addition, the design of the steel plate ring 1 of the present application can limit the forward direction of the pipe segment 200, reduce the risk of misalignment between pipe sections, reduce the risk of the pipe jacking channel deviating from the designed axis, and improve the forming effect of the pipe jacking channel.

[0038] Furthermore, the hinged plate 4 and water-stopping curtain 2 of the present invention are fixed to the tunnel portal 100 via a first anchor 6 and a second anchor 7. A plurality of through-holes 11 are spaced apart on the steel plate ring 1, each having a diameter greater than the maximum diameter of the second anchor 7. The first anchor 6 is installed at a position on the steel plate ring 1 where no through-hole 11 is provided. The first anchor 6 allows the water-stopping curtain 2, hinged plate 4, and steel plate ring 1 to be stacked and fixed to the tunnel portal 100. The second anchor 7 passes through the through-hole 11 to secure the hinged plate 4 and water-stopping curtain 2 to the tunnel portal 100. When the annular rubber strip 5 on the outer periphery of the steel plate ring 1 is severely worn and needs to be replaced, the first anchor 6 can be removed, and the steel plate ring 1 can then be removed, allowing the annular rubber strip 5 to be replaced. While the annular rubber strip 5 is being replaced, the water-stopping curtain 2 and hinged plate 4 remain fixed to the tunnel portal 100 via the second anchor 7, continuing to prevent leakage and not affecting the normal use of the present invention. If the anti-seepage material is blocked in the confined space, the steel plate ring 1 can be removed separately to check the situation in the confined space.

[0039] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A device for preventing leakage of a jacking tunnel, characterized by: It comprises a steel plate ring (1) fixed to the circumference of the tunnel door (100), and the steel plate ring (1) extends into the tunnel door (100), and a water-stop curtain (2) is provided on the side of the steel plate ring (1) facing the jacking direction, and the water-stop curtain (2), the steel plate ring (1) and the side wall of the pipe segment (200) together form a closed space; A plurality of grouting ball valves (3) are fixed to the steel plate ring (1) at intervals in the circumferential direction, and the grouting ball valves (3) are used to inject anti-seepage material into the enclosed space.

2. The anti-leakage device for the jacking tunnel according to claim 1, characterized in that: A folding plate (4) is further provided between the water-stopping curtain (2) and the steel plate ring (1), and the surface of the folding plate (4) is parallel to and close to the surface of the water-stopping curtain (2).

3. The anti-leakage device for the jacking tunnel according to claim 1, characterized in that: The anti-seepage material is a mixture of water glass and phosphoric acid.

4. The anti-leakage device for the jacking tunnel according to claim 1, characterized in that: The inner ring diameter of the steel plate ring (1) is 1 mm larger than the outer diameter of the pipe segment.

5. The anti-leakage device for the jacking tunnel portal according to claim 4, characterized in that: A circumferential rubber strip (5) is fixed to the inner ring edge of the steel plate ring (1), and after the steel plate ring (1) is installed on the tunnel door (100), the circumferential rubber strip (5) is located on the side of the steel plate ring (1) facing the folding plate (4).

6. The anti-leakage device for the jacking tunnel portal according to claim 5, characterized in that: It also includes a first anchor (6) and a second anchor (7), a plurality of through holes (11) are provided on the steel plate ring (1) at intervals, and the diameter of the second anchor (7) is smaller than the diameter of the through holes (11); The first anchor (6) passes through the steel plate ring (1), the water-stop curtain (2) and the folding plate (4) and is then anchored to the tunnel door (100); the second anchor (7) passes through the water-stop curtain (2) and the folding plate (4) and is then anchored to the tunnel door (100).

7. The anti-leakage device for the jacking tunnel portal according to claim 1, characterized in that: The grouting ball valves (3) are arranged at intervals of 1.5 m, and the grouting ball valves (3) are of a 50 mm specification.

8. The anti-leakage device for the jacking tunnel portal according to claim 2, characterized in that: The water-stop curtain (2) is made of rubber material, and the folding plate (4) is made of steel or iron.

9. The anti-leakage device for the jacking tunnel portal according to claim 8, characterized in that: The folding plate (4) and the water-stop curtain (2) both comprise a fixing portion (21) and a bending portion (22), wherein the fixing portion (21) is stacked and fixedly attached to the end face of the tunnel door (100), and the bending portion (22) is bent toward the space between the tunnel door (100) and the inner wall of the pipe segment (200), and the free end of the bending portion (22) is attached to the outer wall of the pipe segment (200).

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