Water-rich stratum shield starting tunnel portal waterstop sealing device

Abstract

The utility model provides a water-rich stratum shield starting tunnel portal waterstop sealing device which comprises a sealing assembly and a plugging assembly, the sealing assembly comprises a short sleeve, a rubber cord fabric, an annular plate and a folding plate, one side of the short sleeve is welded with a pre-buried tunnel portal steel ring, and the other side of the short sleeve is welded with a sealing assembly. The plugging assembly comprises an upper water stop steel plate, a sealing gasket and a lower water stop steel plate, the upper water stop steel plate is laid and welded in a flush mode along the outer diameter of the folding plate, the sealing gasket is arranged on the lower water stop steel plate, and the lower water stop steel plate is welded to the lower water stop steel plate. Bolt holes are reserved in the lower side of the upper waterstop steel plate and the upper side of the sealing gasket, an adjusting sliding groove is reserved in the middle of the lower waterstop steel plate, and the sealing gasket, the lower waterstop steel plate and the upper waterstop steel plate are sequentially connected through second bolts. The adjustable water stop steel plate is adopted to seal and block shield bodies with different diameters when the shield bodies pass through the tunnel portal, gaps are prevented, and the sealing effect is good.

Description

Technical Field

[0001] The utility model relates to the technical field of underground tunnel shield construction, in particular to a water-rich stratum shield starting tunnel portal water-stop sealing device. Background Art

[0002] Existing water-stop sealing devices for tunnel portals at the initial stage are usually composed of a rubber curtain + folding plate + water-stop steel plate connected to the pre-buried tunnel portal steel ring via bolts. Finally, after the shield machine enters the tunnel portal, the water-stop steel plate is welded to form the water-stop sealing device for the initial tunnel portal. For example, the Chinese utility model patent with the announcement number CN 220133967 U discloses a "sealing device for the initial tunnel portal of a shield machine in water-rich strata." The sealing device is formed by installing multiple screws on the initial tunnel portal and sequentially inserting water-stop curtains and water-stop steel plates. This initial tunnel portal sealing device has defects. Because the different diameters of the front and rear shield bodies of the shield machine make it difficult to quickly and effectively form an effective water-stop seal between the shield body and the tunnel portal sealing device through secondary grouting at different stages of the shield machine's initial excavation. For example, during the construction phase of sealing the starting tunnel portal, when welding and sealing the water-stop steel plate at the bottom of the tunnel portal in the water-rich stratum, the water flow may cause the water-stop steel plate to be unable to be welded normally at the bottom of the tunnel portal.

[0003] In addition, in a narrow working shaft, when the remaining space at the bottom of the starting portal and the starting bracket is insufficient for personnel to perform portal welding and sealing operations, the sealing device may fail, thereby causing huge construction risks and safety hazards to shield construction. Summary of the Invention

[0004] In response to the deficiencies of the above-mentioned existing technologies, the utility model provides a water-stop sealing device for the starting portal of a shield tunnel in water-rich strata, which can be prefabricated in advance and uses adjustable water-stop steel plates to seal shields of different diameters when they pass through the portal, preventing gaps and achieving good sealing effect.

[0005] The technical solution provided by the present invention is: a water-stop sealing device for the starting portal of a shield tunnel in a water-rich stratum, comprising a sealing component and a plugging component, wherein the sealing component comprises a short sleeve, a rubber curtain, a ring plate, and a folding plate, one side of the short sleeve is welded to the embedded portal steel ring, and the other side is provided with a bolt hole which is sequentially connected to the rubber curtain, the ring plate, and the folding plate through a first bolt, a plurality of grouting ball valves are provided on the periphery of the short sleeve, the plugging component comprises an upper water-stop steel plate, a sealing gasket, and a lower water-stop steel plate, the upper water-stop steel plate is laid and welded flush along the outer diameter of the folding plate, bolt holes are reserved on the lower side of the upper water-stop steel plate and the upper side of the sealing gasket, an adjusting slide is reserved in the middle of the lower water-stop steel plate, and the sealing gasket, the lower water-stop steel plate, and the upper water-stop steel plate are sequentially connected through a second bolt.

[0006] Furthermore, the short sleeve is cylindrical, and a wire brush is welded inside the short sleeve, and the wire brush is welded along the entire circumference of the inner side of the short sleeve.

[0007] Furthermore, eight grouting ball valves are installed on the outer periphery of the short sleeve and are distributed in a "M" shape.

[0008] Furthermore, the outer diameters of the rubber cord, the ring plate and the folding plate are laid flush with the outer diameter of the short sleeve, and the complete laying body is in a circular ring shape.

[0009] Furthermore, the rubber cord is in the shape of a circular ring as a whole, and the ring plate and the folding plate are a single piece, which are spliced along the outer diameter of the short sleeve to form a circular ring.

[0010] Furthermore, the lower and upper waterstop steel plates are both single pieces. The upper waterstop steel plate is laid flush with the outer diameter of the hinged plate and welded together, forming a circular ring. The lower waterstop steel plate is laid flush with the inner diameter of the upper waterstop steel plate, forming a circular ring. The fixed position of the second bolt in the adjustment chute can be adjusted to meet different usage requirements. By adjusting the second bolt, the lower waterstop steel plate can be moved along the adjustment chute. During shield tunneling, when shields of different diameters pass through the tunnel portal, the second bolt can be adjusted to move the lower waterstop steel plate toward the center of the tunnel portal, thereby effectively blocking the gap between the shield and the embedded tunnel portal steel ring.

[0011] Furthermore, the lower waterstop steel plate and the upper waterstop steel plate are both made of anti-seepage, corrosion-resistant, high-strength alloy steel plates with a thickness of 4-6 mm.

[0012] Furthermore, the sealing gasket is made of silicone rubber or fluororubber with high sealing strength, wear resistance and corrosion resistance.

[0013] This utility model uses prefabricated, adjustable water-stopping steel plates to seal shields of varying diameters as they pass through the tunnel portal. This effectively addresses the drawback of conventional sealing devices, where the different diameters of the front and rear shields of the shield machine create a gap between the shield and the existing water-stopping device during tunnel entry. Furthermore, by prefabricating this device, sealing can be completed quickly and conveniently even in confined and water-rich spaces, ensuring the quality and safety of shield tunneling operations during the initial phase of operation in harsh environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural diagram of the utility model;

[0015] Figure 2 This is a schematic diagram of the assembled sealing component of the utility model;

[0016] Figure 3 This is a schematic diagram of the structural decomposition of the plugging component of the utility model;

[0017] Figure 4This is a schematic diagram of the structural combination of the plugging component of the utility model;

[0018] Figure 5 This is a schematic diagram of the actual simulation application of the utility model.

[0019] In the figure: 1-front shield of shield machine, 2-middle shield of shield machine, 3-tail shield of shield machine, 4-embedded tunnel portal steel ring, 5-short sleeve, 6-wire brush, 7-grouting ball valve, 8-rubber curtain, 9-ring plate, 10-folding plate, 11-first bolt, 12-sealing gasket, 13-lower waterstop steel plate, 1301-adjusting slide, 14-upper waterstop steel plate, 15-second bolt. DETAILED DESCRIPTION

[0020] The present invention is further described below in conjunction with specific embodiments. The accompanying drawings are only for illustrative purposes and represent only schematic diagrams rather than actual drawings. They should not be understood as limiting the present invention. In order to better illustrate the specific embodiments of the present invention, some parts of the accompanying drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the accompanying drawings may be omitted. Based on the specific embodiments of the present invention, all other specific embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0021] In the description of this utility model, it should be noted that the terms "front," "rear," "upper," and "lower," etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations of this utility model. Furthermore, the terms "first," "second," etc., etc., are used solely for distinction and should not be construed as indicating or implying relative importance.

[0022] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "provided with," "connected," etc., should be understood in a broad sense. For example, "connected" may refer to a fixed connection, a detachable connection, or an integral connection; it may refer to a mechanical connection or an electrical connection; it may refer to a direct connection or an indirect connection through an intermediate medium; it may refer to internal communication between two components. Those skilled in the art will be able to understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0023] The embodiment provides a water-rich stratum shield starting tunnel door water-stop sealing device, including a sealing component and a blocking component, such as Figure 1 and Figure 2As shown, the sealing assembly includes a short sleeve 5, a rubber curtain 8, a ring plate 9, and a hinged plate 10. The short sleeve 5 is welded to the pre-buried tunnel portal steel ring 4. Eight grouting ball valves 7 are located on the outer circumference of the short sleeve 5, arranged in a "M" shape. A wire brush 6 is welded to the entire circumference of the short sleeve 5. Bolt holes are reserved on the side circumference of the short sleeve 5. The rubber curtain 8 is annular in shape, with an outer ring diameter identical to the pre-buried tunnel portal steel ring 4 and the short sleeve 5. The inner ring diameter is smaller than the minimum diameter of the shield body. Bolt holes are reserved on the outer circumference edge. The ring plate 9 and hinged plate 10 are both single pieces and arranged in an annular pattern along the outer circumference of the rubber curtain 8. After installation, the entire assembly forms an annular shape. Bolt holes are reserved on the upper portions of the ring plate 9 and hinged plate 10. The rubber curtain 8, ring plate 9, and hinged plate 10 are connected in sequence through the reserved holes by a first bolt 11. The rubber curtain 8 is made of chloroprene rubber with a high inner edge tensile strength.

[0024] like Figure 3 and Figure 4 As shown, the sealing assembly includes an upper water-stop steel plate 14, a sealing gasket 12 and a lower water-stop steel plate 13. The upper water-stop steel plate 14 is welded to the hinge plate 10, and bolt holes are reserved on the lower side of the upper water-stop steel plate 14 and the upper side of the sealing gasket 12. An adjustment slot is reserved in the middle of the lower water-stop steel plate 13. When in use, the lower water-stop steel plate 13 is adjusted to a suitable position along the slot by loosening the second bolt 15 and then tightening it. The sealing gasket 12, the lower water-stop steel plate 13, the upper water-stop steel plate 14 and the hinge plate 10 are welded together by the upper water-stop steel plate 14. 4, the lower waterstop steel plate 13 and the upper waterstop steel plate 14 are both single pieces. The upper waterstop steel plate 14 is laid flush with the outer diameter of the hinged plate 10, forming a circular ring when laid. The lower waterstop steel plate 14 is laid flush with the inner diameter of the upper waterstop steel plate 14, forming a circular ring when laid. It can be adjusted to overlap with the upper waterstop steel plate 14 by loosening the second bolt 15. The lower waterstop steel plate 13 and the upper waterstop steel plate 14 are both made of impermeable, corrosion-resistant, high-strength alloy steel plates with a thickness of 4-6 mm. The sealing gasket 12 is made of silicone rubber or fluororubber with high sealing strength, wear resistance, and corrosion resistance.

[0025] like Figure 5As shown, the present invention can be pre-assembled before use and then installed in an integrated manner. The short sleeve 5 has a bolt hole reserved on one side, and the rubber curtain 8, the ring plate 9, and the hinge plate 10 are connected and fastened in sequence by a first bolt 11. The upper waterstop steel plate 14 is welded securely to the hinge plate 10, and then the sealing gasket 12, the lower waterstop steel plate 13, and the upper waterstop steel plate 14 are connected in sequence by a second bolt 15. A wire brush 6 is welded around the entire circumference of the short sleeve 5, and a grouting ball valve 7 is reserved and installed on the outside. After the above installation is completed, the other side of the short sleeve 5 is welded securely to the embedded tunnel portal steel ring 4 and the device can be used. Since the shield body of the shield machine is generally designed to be "inverted cone", there are certain differences in the diameters of the shield machine's front shield 1, middle shield 2, and tail shield 3. In conventional tunnel portal sealing devices, when different shield bodies pass through the tunnel portal, a gap will exist between the sealing device and the shield body. If the starting tunnel portal is located in an extreme environment such as near the sea, rich in water, and extremely soft strata, these gaps may pose a huge construction safety hazard. To address this phenomenon, the utility model can quickly and conveniently seal the gap between the sealing assembly and the shield body through the lower water-stop steel plate 13 with adjustable position in the sealing assembly. At the same time, after the shield machine passes through the tunnel portal, it can also use this method to quickly seal the tunnel portal and use the reserved grouting ball valve 7 or pipe segment opening on the short sleeve 5 for secondary grouting sealing.

[0026] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A water-stop sealing device for the initial tunnel portal of a shield tunnel in a water-rich stratum, characterized by: It includes a sealing component and a plugging component. The sealing component includes a short sleeve (5), a rubber curtain cloth (8), an annular plate (9) and a hinge plate (10). One side of the short sleeve (5) is welded to the embedded portal steel ring (4), and the other side has reserved bolt holes and is sequentially connected to the rubber curtain cloth (8), the annular plate (9) and the hinge plate (10) through a first bolt (11). A plurality of grouting ball valves (7) are arranged on the outer periphery of the short sleeve (5). The plugging component includes an upper water stop steel plate (14), a sealing gasket (12) and a lower water stop steel plate (13). The upper water stop steel plate (14) is laid and welded flush with the outer diameter of the hinge plate (10). There are reserved bolt holes on the lower side of the upper water stop steel plate (14) and the upper side of the sealing gasket (12). There is a reserved adjustment chute (1301) in the middle of the lower water stop steel plate (13). The sealing gasket (12), the lower water stop steel plate (13) and the upper water stop steel plate (14) are sequentially connected through a second bolt (15).

2. The water-stop sealing device for the shield tunneling starting portal in water-rich strata according to claim 1 is characterized in that: The short sleeve (5) is cylindrical, and a wire brush (6) is welded inside the short sleeve (5), and the wire brush (6) is welded along the inner circumference of the short sleeve (5) in a full circle.

3. The water-stop sealing device for the shield tunneling portal in water-rich strata according to claim 1 is characterized in that: Eight grouting ball valves (7) are installed on the outer periphery of the short sleeve (5) and are distributed in a "rice" shape.

4. The water-stop sealing device for the shield tunneling portal in water-rich strata according to claim 1 is characterized in that: The outer diameters of the rubber curtain cloth (8), the annular plate (9) and the hinge plate (10) are laid flush with the outer diameter of the short sleeve (5), and the whole laid body is circular.

5. The water-stop sealing device for the shield tunneling starting portal in water-rich strata according to claim 4 is characterized in that: The rubber curtain cloth (8) is integrally circular, and the annular plate (9) and the hinge plate (10) are single pieces, and they are spliced along the outer diameter of the short sleeve (5) to form a circular shape.

6. The water-stop sealing device for the shield tunneling starting portal in water-rich strata according to claim 1 is characterized in that: Both the lower water stop steel plate (13) and the upper water stop steel plate (14) are single pieces. The upper water stop steel plate (14) is laid along the outer diameter of the hinge plate (10) and the whole laid body is circular. The lower water stop steel plate (13) is laid flush with the inner diameter of the upper water stop steel plate (14), and the whole laid body is circular. By adjusting the fixed position of the second bolt (15) in the adjustment chute (1301) to meet different usage requirements.

7. The water-stop sealing device for the shield tunneling portal in water-rich strata according to claim 1, characterized in that: Both the lower water stop steel plate (13) and the upper water stop steel plate (14) are made of anti-seepage, corrosion-resistant and high-strength alloy steel plates with a thickness of 4 - 6 mm.

8. The water-stop sealing device for the shield tunnel launch portal in water-rich strata according to claim 1, characterized in that: The sealing gasket (12) is made of silicone rubber or fluorine rubber.

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