Water-stop sealing device for shield tunnel portal

Abstract

The present invention relates to the technical field of tunnel construction, and in particular to a water-stopping sealing device for a shield tunnel portal, comprising a rubber curtain plate and a steel wire brush, wherein the rubber curtain plate and the steel wire brush are arranged in a coaxial ring shape; the rubber curtain plate and the steel wire brush are arranged in sequence along a first direction, and the steel wire brush can be pressed against the rubber curtain plate under the action of an external force, so that the rubber curtain plate fits tightly against the shield machine casing, thereby improving the water-stopping sealing effect of the rubber curtain plate.

Description

Technical Field

[0001] The present invention relates to the technical field of tunnel construction, in particular to a water-stopping sealing device for a shield tunnel portal. Background Art

[0002] Shield construction is widely used in underground engineering construction. Shield construction technology is not affected by ground traffic, river channels, climate and other conditions, and can ensure safe tunnel construction in a relatively economical and reasonable manner. The shield's advancement, excavation, lining assembly, etc. can be automated, intelligent, and remotely controlled by information technology. The excavation speed is fast, the construction labor intensity is low, and the construction safety is high. In soil or soft rock formations, it has economic, technical and safety advantages for long-distance tunneling projects.

[0003] When the water content of the strata within the construction area is high, the strata are disturbed during the launch and reception of the shield machine, which can easily form a groundwater seepage channel between the tunnel portal and the shield machine casing. Groundwater mixed with mud and sand can flow out, causing accidents such as water and sand gushing. Therefore, water sealing is required at the tunnel portal to ensure the smooth launch and reception of the shield machine. The commonly used tunnel portal water-stopping sealing device in the industry generally consists of two wire brushes and a rubber curtain plate. The rubber curtain plate is compressed by a folding pressure plate to achieve a sealing effect. However, the rubber curtain plate does not fit the shield body and folding pressure plate of the shield machine well, which can easily cause water and slurry leakage. Especially when the groundwater pressure is high, the risk of water / sand gushing is even higher. Summary of the Invention

[0004] The purpose of the present invention is to provide a water-stopping sealing device for a shield tunnel portal, which can effectively enhance the water-stopping effect of the rubber curtain plate and ensure the orderly progress of shield construction.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] The water-stop sealing device of the shield tunnel portal includes a rubber curtain plate and a wire brush. The rubber curtain plate and the wire brush are coaxial rings and are arranged in sequence along a first direction. When the shield machine passes through the tunnel portal, the wire brush can be pressed against the rubber curtain plate.

[0007] Optionally, there are two wire brushes, and a sealed cavity is formed between the two wire brushes, and grease can be filled in the sealed cavity.

[0008] Optionally, the axial cross-section of the wire brush is annular, and the two wire brushes are connected to each other in an "∞" shape, and a grease injection hole is provided at the intersection of the "∞"-shaped structure.

[0009] Optionally, a packing seal assembly is further included, and the packing seal assembly is arranged on a side of the rubber curtain plate and the wire brush away from the tunnel door.

[0010] Optionally, the packing sealing assembly includes a base plate, a pressure plate and a sealing packing, the base plate, the pressure plate and the sealing packing are all annular, the base plate and the pressure plate are spaced apart along the axial direction of the portal and form a clamping area, the sealing packing is located in the clamping area, the gap size of the clamping area is adjustable, and the sealing packing can be limited, locked and squeezed.

[0011] Optionally, the bottom plate further includes an annular limiting connection portion, which is attached to the outer peripheral side of the sealing filler and can limit the deformation of the outer peripheral side of the sealing filler.

[0012] Optionally, the packing seal assembly further includes an annular pressure cover, which is screwed onto the base plate and abuts against the pressure plate.

[0013] Optionally, the water-stopping sealing device of the shield tunnel portal further includes an extended steel ring, the wire brush is installed on the inner wall of the extended steel ring, and the rubber curtain plate is arranged on the end face of the extended steel ring.

[0014] Optionally, a folding flap is further included, and the folding flap is arranged on the side of the rubber curtain plate facing away from the wire brush.

[0015] Optionally, a raised portion is provided at the tail end of the rubber curtain plate that is in contact with the wire brush.

[0016] The beneficial effects of the present invention are as follows: the water-stopping and sealing device for the shield tunnel portal provided in the present invention is arranged on the inner or outer side of the tunnel portal when in use, and the rubber curtain plate and the wire brush are both arranged coaxially with the tunnel portal along the inner circumference of the tunnel portal, and the wire brush and the rubber curtain plate are arranged along the traveling direction of the shield machine. When the shield machine passes through the tunnel portal, the rubber curtain plate is squeezed onto the wire brush under the extrusion action of the shield machine casing, that is, the wire brush can not only play the role of water-stopping and sealing, but also can press on the rubber curtain plate to squeeze it, so that it fits more closely with the shield machine, thereby enhancing the water-stopping effect of the rubber curtain plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Schematic diagram of the structure of a water-stop sealing device installed at a launching tunnel portal according to an embodiment of the present invention;

[0018] Figure 2 Schematic diagram of the structure of a water-stop sealing device installed on a receiving tunnel door according to an embodiment of the present invention;

[0019] Figure 3 It is a partial structural schematic diagram of the packing seal assembly described in an embodiment of the present invention.

[0020] In the figure: 11, rubber curtain plate; 12, wire brush; 121, grease injection hole; 13, packing seal assembly; 131, bottom plate; 131a, limit connection; 132, pressure plate; 133, sealing packing; 134, gland; 135, gland bolt; 14, hinged flap; 15, extension steel ring; 2, tunnel portal; 3, tunnel portal steel ring; 31, axial steel ring; 32, radial steel ring; 4, shield machine. DETAILED DESCRIPTION

[0021] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It will be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all structures.

[0022] In the description of the present invention, unless otherwise expressly specified or limited, the terms "connected," "connected," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections 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 circumstances.

[0023] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0024] In the description of this embodiment, the terms "upper," "lower," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meanings.

[0025] The present invention proposes a water-stopping sealing device for a shield tunnel portal, which is mainly used for water-stopping sealing during shield construction. It is specifically installed at the starting shield tunnel portal and / or the receiving shield tunnel portal. By changing the shape of the wire brush, the wire brush can abut against the rubber curtain plate when the shield machine passes through the tunnel portal, thereby enhancing the water-stopping sealing effect of the rubber curtain plate.

[0026] refer to Figure 1-3 As shown, the water-stop sealing device of the shield tunnel portal proposed in this embodiment is installed on the tunnel portal steel ring 3 embedded in the tunnel portal 2, and includes a rubber curtain plate 11 and a wire brush 12. The rubber curtain plate 11 and the wire brush 12 are arranged in sequence along the first direction (in this embodiment, the direction of travel of the shield machine 4), serving as the first sealing component and the second sealing component respectively. The rubber curtain plate 11 and the wire brush 12 are annular in shape coaxial with the tunnel portal 2. When the shield machine 4 passes through the tunnel portal 2, the wire brush 12 close to the rubber curtain plate 11 can be pressed against the rubber curtain brush 11.

[0027] When the shield machine 4 passes through the tunnel portal 2, the wire brush 12 close to the rubber curtain plate 11 can squeeze the outer surface of the rubber curtain brush 11 due to its elasticity, making it fit more closely with the shield machine 4, forming the first layer of sealing, and achieving a good water-stopping sealing effect.

[0028] Two wire brushes 12 are provided, arranged along the first direction, and grease can be filled between the wire brushes 12 to form a seal, thereby enhancing the water-stopping effect of the entire water-stop sealing device and avoiding water leakage.

[0029] Optionally, the axial cross-section of the wire brush is set to be annular. At the same time, in order to reduce the space occupied by the entire water-stop sealing device, the two wire brushes 12 are connected to each other in an "∞" shape. The intersection of the two wire brushes 12 is provided with a plurality of grease injection holes 121 spaced apart along the circumference of the wire brush 12. Each grease injection hole 121 is connected to the grease distribution valve through a corresponding grease injection tube, and grease can be injected into the sealing cavity formed between the two wire brushes 12, thereby achieving a water-stop sealing effect.

[0030] Specifically, the wire brush 12 includes a steel wire and a spring sheet, wherein the spring sheet is wrapped around the outer circumference of the steel wire to increase the elastic force of the entire wire brush 12, thereby ensuring that when the shield machine 4 passes through the tunnel portal 2, the wire brush 12 is tightly fitted with the rubber curtain plate 11. The annular structure of the wire brush 12 can be formed by bending the wire brush 12 structure in the prior art.

[0031] Furthermore, a raised portion is provided at the tail end of the rubber curtain plate 11 that is in contact with the wire brush 12, so that the rubber curtain plate 11 can better fit the wire brush 12 and ensure a sealing effect.

[0032] refer to Figure 1 and Figure 2As shown, the tunnel portal steel ring 3 embedded in the tunnel portal 2 has an L-shaped axial cross-section and a thickness of about 10 mm. It includes an axial steel ring 32 embedded in the inner wall of the tunnel portal 2 and a radial steel ring 31 embedded in the end face of the tunnel portal 2. The axial steel ring 32 and the radial steel ring 31 are separately arranged.

[0033] like Figure 1 , a water-stop sealing device is installed on the shield tunnel portal of the starting tunnel portal. The rubber curtain plate 11 is fixed to the radial steel ring 31 by fixing bolts, and the wire brush 12 is installed on the inner wall of the axial steel ring 32. When the shield machine 4 moves into the tunnel portal 2, the rubber curtain plate 11 is stretched open, and the rubber curtain plate 11 is deformed toward the wire brush 12 in the tunnel portal 2. The wire brush 12 is pressed against the rubber curtain plate 11, and its elastic force reacts on the rubber curtain plate 11 to make the rubber curtain plate 11 close to the outer casing of the shield machine 4, thereby achieving a water-stop sealing effect.

[0034] like Figure 2 The water-stop sealing device of the shield tunnel portal installed at the receiving tunnel portal also includes an extended steel ring 15, a rubber curtain plate 11 is installed on the radial steel ring 31 by fixing bolts, and a wire brush 12 is arranged on the inner wall of the extended steel ring 15 installed on the side of the rubber curtain facing away from the radial steel ring 31. The extended steel ring 15 is coaxially arranged with the tunnel portal 2. When the rubber curtain plate 11 is installed, the extended steel ring 15 and the rubber curtain plate 11 are fixed by the same fixing bolt, that is, the rubber curtain plate 11 is arranged on the end surface where the extended steel ring 15 is connected to the radial steel ring 31. When the shield machine 4 moves away from the tunnel portal 2, the rubber curtain plate 11 is stretched out. Plate 11, the rubber curtain plate 11 is deformed toward the wire brush 12 outside the tunnel portal 2, and the wire brush 12 presses against the rubber curtain plate 11 to make it close to the outer shell of the shield machine 4; the rubber curtain plate 11 is also provided with a folding flap 14 on the side facing the shield machine 4, and the folding flap 14 includes a mounting plate fixed on the radial steel ring 31 and a flip plate rotatably connected to the mounting plate. During the advancement of the shield machine 4, the flip plate will flip under the advancement of the shield machine 4, thereby supporting the rubber curtain plate 11, and avoiding the situation where the rubber curtain plate 11 flips reversely due to excessive water and soil pressure in the front.

[0035] refer to Figure 2-3As shown, the water-stop sealing device of the shield tunnel portal in this embodiment also includes a third sealing component, which is a packing sealing component 13, including a base plate 131, a pressure plate 132 and a sealing packing 133, wherein the base plate 131, the pressure plate 132 and the sealing packing 133 are all annular structures coaxial with the tunnel portal 2, and the base plate 131 and the pressure plate 132 are spaced apart along the extension direction of the tunnel portal 2 to form a clamping area, and the sealing packing 133 is located in the clamping area, and the initial gap of the clamping area is consistent with the thickness of the sealing packing 133 to prevent the sealing packing 133 from escaping from the clamping area. The gap size of the clamping area is adjustable, and the sealing packing 133 can be evenly squeezed by reducing the distance between the base plate 131 and the pressure plate 132, so that the thickness of the sealing packing 133 becomes smaller, resulting in radial deformation, thereby achieving a close fit with the shield machine 4 and a water-stop sealing effect.

[0036] To facilitate adjustment of the spacing between the bottom plate 131 and the pressure plate 132, the packing seal assembly 13 is disposed on the outside of the tunnel portal 2, specifically at the outermost end of the water-stop sealing device of the entire shield tunnel portal, that is, on the side of the rubber curtain plate 11 and the wire ring away from the tunnel portal 2. For example, if the entire device is installed at the starting tunnel portal, the packing seal assembly 13 is mounted on the side of the rubber curtain plate 11 facing away from the tunnel portal 2. Specifically, the bottom plate 131 is mounted on the radial steel ring 31. If the entire device is installed at the receiving tunnel portal, the packing seal assembly 13 is mounted on the side of the wire brush 12 facing away from the tunnel portal 2. Specifically, the bottom plate 131 is mounted on the extended steel ring 15. The bottom plate 131 can be integrally formed with the extended steel ring 15 to form a "Z"-shaped or "U"-shaped structure. In this embodiment, in order to reduce the volume of the wire brush 12, a "Z"-shaped structure is formed between the bottom plate 131 and the extended steel ring 15.

[0037] Optionally, in order to make the sealing filler 133 deform as much as possible inwardly during radial deformation so as to fit tightly against the shield machine casing, the bottom plate 131 also includes an annular limiting connection portion 131a coaxial with the tunnel portal 2, and the limiting connection portion 131a fits against the outer peripheral side of the sealing filler 133. When the bottom plate 131 and the pressure plate 132 squeeze the sealing filler 133, the limiting connection portion 131a prevents the sealing filler 133 from deforming toward the outer peripheral side, and the sealing filler 133 fits tightly against the shield machine casing 4.

[0038] To facilitate applying force to the pressure plate 132, the packing seal assembly 13 also includes an annular gland 134 coaxial with the portal 2. This gland 134 is connected to the base plate 131 via gland bolts 135, specifically to the limiting connection portion 131a of the base plate 131. The limiting connection portion 131a has an L-shaped axial cross-section, and the axial cross-section of the gland 134 is L-shaped, aligning with the opening direction of the limiting connection portion 131a. The end of the gland 134 axially aligned with the portal 2 can push the pressure plate 132. The end of the gland 134 radially aligned with the portal 2 is connected to the limiting connection portion 131a via gland bolts 135. Tightening the gland bolts 135 reduces the gap in the clamping area, causing radial deformation of the packing 133. In this embodiment, the packing 133 is made of butter packing, which has excellent self-lubrication, a low friction coefficient, and is wear-resistant.

[0039] The pressure plate 132 can be slidably mounted on the limiting connection portion 131a of the bottom plate 131 or on the end of the pressure cover 134. No specific restrictions are imposed here, as long as the axis of the pressure plate 132 can be aligned with the axis of the cave door 2.

[0040] It can be understood that the water-stopping sealing device of the shield tunnel portal installed at the starting tunnel portal, because the bottom plate 131 is installed on the side of the rubber curtain plate 11 facing away from the tunnel portal 2, the bottom plate 131 can play the role of the folding flap 14. Therefore, when the water-stopping sealing device of the entire shield tunnel portal is installed in the starting tunnel portal, the folding flap 14 can be omitted.

[0041] The present invention also includes a method for installing the water-stopping sealing device of the shield tunnel portal, taking installation at a receiving tunnel portal as an example (here, the water-stopping sealing device of the shield tunnel portal includes a packing sealing assembly 13).

[0042] S1. Screw one end of the fixing bolt into the radial steel ring 31 of the pre-buried tunnel steel ring 3. Then install the hinged flap 14, rubber curtain plate 11, extension steel ring 15, and wire brush 12 in sequence. Pre-weld them on the extension steel ring 15. Then, put the nut on the fixing bolt and tighten it.

[0043] S2. Install the sealing filler 133 and the pressure plate 132 on the axial outside of the base plate 131 in sequence, so that the sealing filler 133 is located in the clamping area formed by the pressure plate 132 and the base plate 131. At this time, the sealing filler 133 is in a relaxed state without compression.

[0044] When the shield machine 4 passes through the rubber curtain plate 11, because the inner diameter of the rubber curtain plate 11 is smaller than the outer diameter of the shield machine 4 outer shell, the shield machine 4 opens the rubber curtain plate 11, and the rubber curtain plate 11 wraps and compresses one of the wire brushes 12. The reaction force of the wire brush 12 and the elastic force of the rubber curtain plate 11 itself make the rubber curtain plate 11 fit tightly with the shield machine 4 outer shell, achieving the first level of water-stopping sealing effect.

[0045] When the shield machine 4 passes through two wire brushes 12, grease is injected into the sealing cavity formed by the wire brushes 12 through the grease injection hole 121. The grease and the wire brushes 12 together play a second water-stopping sealing effect.

[0046] When the shield machine 4 continues to pass through the packing sealing assembly 13, the pressure cover 134 drives the pressure plate 132 to evenly squeeze the sealing packing 133. The thickness of the sealing packing 133 becomes smaller and deforms in the radial direction, fitting tightly with the shield machine 4, thereby achieving a third water-stopping sealing effect.

[0047] Different from the receiving tunnel portal, when the shield machine 4 passes through the starting tunnel portal, it first passes through the packing sealing assembly. The pressure cover 134 drives the pressure plate 132 to evenly extrude the sealing packing 133. The sealing packing 133 produces radial deformation and fits tightly with the shield machine 4, playing the first water-stopping sealing effect.

[0048] When the shield machine 4 then passes through the rubber curtain plate 11, the rubber curtain plate 11 is in close contact with the wire brush, thus achieving a second level of water-stopping and sealing effect.

[0049] When the shield machine 4 continues to pass through the two wire brushes 12, the sealing cavity filled with grease plays a third water-stopping sealing effect.

[0050] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the embodiments of the present invention. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. The water-stop sealing device of the shield tunnel door is characterized by: include: A rubber cord plate (11) is arranged in a ring shape; A wire brush (12) is provided in a ring shape coaxial with the rubber cord plate (11); The rubber curtain plate (11) and the steel wire brush (12) are arranged in sequence along a first direction, and the steel wire brush (12) can be pressed against the rubber curtain plate under the action of an external force; the number of the steel wire brushes (12) is two, and a sealed cavity is formed between the two steel wire brushes (12), and grease can be filled in the sealed cavity; the axial cross-section of the steel wire brush is annular, and the two steel wire brushes (12) are connected to each other in an "∞" shape, and a grease injection hole (121) is opened at the intersection of the "∞"-shaped structure; a protrusion is provided at the tail end of the rubber curtain plate (11) and the steel wire brush (12) that are in contact with each other.

2. The water-stop sealing device for a shield tunnel portal according to claim 1, characterized in that: The invention also comprises a packing seal assembly (13), wherein the packing seal assembly (13) is configured to be arranged on a side of the rubber cord plate (11) and the wire brush (12) away from the tunnel door (2).

3. The water-stop sealing device for a shield tunnel portal according to claim 2, characterized in that: The packing seal assembly (13) comprises a base plate (131), a pressure plate (132) and a sealing packing (133); the base plate (131), the pressure plate (132) and the sealing packing (133) are all annular; the base plate (131) and the pressure plate (132) are spaced apart along the axial direction of the water-stop sealing device and form a clamping area; the sealing packing (133) is located in the clamping area; the gap size of the clamping area is adjustable, and the sealing packing (133) can be limited, locked and squeezed.

4. The water-stop sealing device for a shield tunnel portal according to claim 3, characterized in that: The bottom plate (131) further includes an annular position-limiting connection portion (131a), and the position-limiting connection portion (131a) is attached to the outer peripheral side of the sealing filler (133) and can limit the deformation of the outer peripheral side of the sealing filler (133).

5. The water-stop sealing device for a shield tunnel portal according to claim 3, characterized in that: The packing seal assembly (13) further comprises an annular pressure cover (134), wherein the pressure cover (134) is screwed onto the bottom plate (131), and the pressure cover (134) abuts against the pressure plate (132).

6. The water-stop sealing device for a shield tunnel portal according to claim 1, characterized in that: It also includes an extended steel ring (15), the steel wire brush (12) is installed on the inner wall of the extended steel ring (15), and the rubber curtain plate (11) is arranged on the end surface of the extended steel ring (15).

7. The water-stop sealing device for a shield tunnel portal according to claim 1, characterized in that: It also includes a folding flap (14), which is arranged on the side of the rubber curtain plate (11) facing away from the steel wire brush (12).

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