Shield construction tunnel door sealing device
By designing a door sealing device with an automatic inclined elastic retaining ring composed of multiple elastic steel plates in the shield construction, the problem that the existing sealing device is easily broken down under high water pressure is solved, and the good sealing effect is achieved when the shield machine is initiated or received, reducing the risk of safety accidents.
Patent Information
- Application Number
- CN202421554280.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-03
- Publication Date
- 2025-04-01
- Estimated Expiration
- 2034-07-03
AI Technical Summary
In shield construction, especially in the geological conditions where groundwater is abundant and groundwater level is high, existing door sealing devices are prone to safety accidents such as water and sand gushing and sand guttering and failure to build pressure due to the phenomenon of rubber curtain curves not being closely attached to the pipe sheet, tearing and tearing the cutter tool to damage the rubber curtains, and the seal being penetrated, resulting in safety accidents such as water and sand gushing in the hole doors and inability to build pressure.
A shield construction door sealing device is designed, including a first annular base and a second annular base arranged at intervals on the embedded steel ring or extended steel ring of the hole door, and a first elastic retaining ring and a second elastic retaining ring are respectively provided. These elastic retaining rings are composed of overlapping multiple elastic steel plates, which automatically tilt and come into contact with the shield machine when it passes through, forming a sealing cavity.
This device can effectively ensure the overall sealing of the hole door when the shield machine is initiated or received, avoid accidents such as water and sand gushing. Due to the bidirectional extrusion ability of the double-layer steel plate, it has excellent durability and safety and reliability.
Smart Images
Figure CN222701979U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of shield construction, in particular to a shield construction tunnel door sealing device. Background Art
[0002] During the shield construction process, the starting or receiving of the shield has always been a difficult and important point in the construction. Especially when constructing in geological conditions with abundant groundwater and high groundwater levels, safety accidents such as water and sand gushing caused by tunnel opening sealing problems often occur. In severe cases, it can lead to major public safety accidents and pose a great safety challenge to subway tunnel construction. Therefore, during the shield construction process, extremely high requirements are placed on the sealing performance of the shield starting or receiving tunnel openings.
[0003] In the existing construction, the method of installing rubber curtains and folding plates on the pre-buried steel rings of the tunnel portal is generally adopted. During the forward movement of the shield machine, the rubber curtains are wrapped around the cutterhead, shield body, and pipe segments by water and soil counterpressure at the start, and wrapped around the cutterhead, shield body, and pipe segments by 5T hand winches at the reception, so as to achieve the purpose of sealing the tunnel portal. However, in the actual construction process, it is very easy for the rubber curtains to not fit tightly with the pipe segments, the cutterhead cutters tear and damage the rubber curtains, and the seals are punctured under the action of high water pressure, which in turn causes water and sand gushing from the tunnel portal, and the inability to build pressure. It is difficult to seal and is very easy to cross-flow. In addition, there is no sealing operation space within the 60° range at the bottom of the tunnel. Double liquid slurry or polyurethane is usually used for emergency plugging, but its sealing effect is poor and the safety risk is high. The tunnel portal often cannot be effectively closed in a ring, which is very easy to cause accidents such as ground collapse, pipeline settlement, and station flooding.
[0004] In order to enhance the sealing effect of the tunnel portal, in projects with abundant groundwater and high groundwater levels, auxiliary measures such as increasing the number of rubber curtains and welding tunnel portal brushes on the embedded steel rings along the excavation direction are often adopted, but these measures have not completely solved the problem. Especially when the shield machine is receiving, the tunnel portal brushes can only be welded along the excavation direction, and the pressure bearing capacity is weak and cannot resist the water and soil pressure. Secondly, because the shield machine cutterhead is not concentric with the embedded steel ring when receiving, the cutterhead tool is easy to damage the additional rubber curtains. All of the above situations are likely to cause sealing leakage. Summary of the invention
[0005] In order to solve the above problems, the utility model provides a shield construction tunnel door sealing device, which can specifically adopt the following technical solutions:
[0006] The utility model discloses a shield construction tunnel door sealing device, which is suitable for shield starting tunnel doors and shield receiving tunnel doors. The sealing device comprises a first annular base and a second annular base which are arranged at intervals on a tunnel door pre-embedded steel ring or a tunnel door extension steel ring. A first elastic retaining ring is arranged on the first annular base, and a second elastic retaining ring is arranged on the second annular base. The first elastic retaining ring and the second elastic retaining ring are both formed by overlapping a plurality of elastic steel plates in sequence. In a free state, the free ends of the first elastic retaining ring and the second elastic retaining ring contact with each other to form a deformation cavity, in which an adsorption filling layer is arranged. When a shield machine passes by, the first elastic retaining ring and the second elastic retaining ring are both inclined in the direction in which the shield machine advances, and the free ends of the first elastic retaining ring and the second elastic retaining ring are separated from each other, so that the adsorption filling layer in the deformation cavity is also connected with the shield machine. After the shield machine passes by, the first elastic retaining ring and the second elastic retaining ring automatically adjust the inclination angle, and the first elastic retaining ring, the second elastic retaining ring and the adsorption filling layer are all connected with the formed pipe segment.
[0007] The first annular base and the second annular base are both segmented structures with the same structure. Each segment includes a fixing plate welded to the pre-embedded steel ring of the portal or the extended steel ring of the portal and a pressing plate arranged on the surface thereof. Rivet mounting holes are arranged on the fixing plate and the pressing plate.
[0008] The elastic steel plate is formed by bending a 65Mn steel plate with a thickness of 1.0 mm and a hardness of HRC45-48, and includes a fixing portion connected to the first annular base / the second annular base and a bending portion extending toward one side of the second annular base / the first annular base.
[0009] The width of the bending portion of the elastic steel plate is greater than the width of the fixing portion, and the connection between the bending portion and the fixing portion is a trapezoidal structure.
[0010] The elastic steel plates are overlapped at adjacent fixing parts, and the overlap width is 25 mm.
[0011] The bending parts of the first elastic retaining ring and the second elastic retaining ring are symmetrically arranged in a free state, and the cross-section of the deformation cavity is an isosceles triangle structure.
[0012] The adsorption filling layer is made of sponge material.
[0013] The shield construction portal sealing device provided by the utility model can ensure the overall sealing of the starting or receiving portal, so that the portal sealing effect can be timely achieved after the front shield of the shield machine passes through, thereby achieving the purpose of portal sealing. The double-layer steel plate connected to the pre-buried steel ring or extended steel ring of the portal in the utility model can be extruded in both directions, and even if it encounters reverse wear under the extreme gap, it also shows excellent durability and will not break, ensuring safety and reliability; the steel plate does not need to distinguish the installation direction when welding, which overcomes the disadvantage that the portal brush can only be used in one direction, and meets the requirements of shield starting or receiving construction, and has wide applicability; at the same time, the utility model can be used in combination with other sealing devices according to the actual conditions on site, and the installation method is flexible and convenient; when the shield machine passes through, it automatically wraps around the cutter head, shield body, and pipe segment by its own high-strength elastic force, and there is no need for hand winches to perform tensioning and other operations, and the overall sealing effect of the portal is good and economical. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 It is a structural schematic diagram of the utility model.
[0015] Figure 2 yes Figure 1 Enlarged view of part A in .
[0016] Figure 3 yes Figure 2 Schematic diagram of the connection structure between the first annular base and the elastic steel plate.
[0017] Figure 4 It is a schematic diagram of the structure of the utility model when a shield machine passes through.
[0018] Figure 5 yes Figure 4 Enlarged view of part B in .
[0019] Figure 6 It is a schematic diagram of the state of the utility model after the shield machine has passed. DETAILED DESCRIPTION
[0020] The following is a detailed description of an embodiment of the utility model in conjunction with the accompanying drawings. This embodiment is implemented on the premise of the technical solution of the utility model, and a detailed implementation method and a specific working process are given, but the protection scope of the utility model is not limited to the following embodiment.
[0021] like Figure 1-6As shown, the shield construction tunnel door sealing device described in the utility model is suitable for the shield starting tunnel door and the shield receiving tunnel door. The sealing device includes a first annular base 2 and a second annular base 3 arranged at intervals on the tunnel door embedded steel ring or the tunnel door extension steel ring 1. The first annular base 2 is provided with a first elastic retaining ring 4, and the second annular base 3 is provided with a second elastic retaining ring 5. The first elastic retaining ring 4 and the second elastic retaining ring 5 are both formed by overlapping multiple elastic steel plates 6 in sequence; in a free state, the free ends of the first elastic retaining ring 4 and the second elastic retaining ring 5 contact each other to form a deformation cavity. An adsorption filling layer 7 is provided in the deformation cavity; when the shield machine M passes by, the first elastic retaining ring 4 and the second elastic retaining ring 5 are both inclined in the direction of the forward movement of the shield machine M, and the free ends of the first elastic retaining ring 4 and the second elastic retaining ring 5 are separated from each other, so that the adsorption filling layer 7 in the deformation cavity is also connected with the shield machine M; the shield machine M continues to move forward, and when the shield machine M is separated from the tunnel door sealing device, the first elastic retaining ring 4 and the second elastic retaining ring 5 automatically adjust the bending angle, rebound to the formed pipe segment to re-constitute the sealing cavity, at this time, the adsorption filling layer 7 is also in contact with the formed pipe segment, thereby playing a role in tunnel door sealing.
[0022] Specifically, the first annular base 2 and the second annular base 3 are both segmented structures with the same structure. Each segment includes a fixing plate 21 welded to the portal embedded steel ring or the portal extension steel ring 1 and a pressing plate 22 arranged on the surface thereof. Rivet mounting holes 23 are provided on the fixing plate 21 and the pressing plate 22.
[0023] The elastic steel plate 6 is formed by bending a 65Mn steel plate with a thickness of 1.0 mm and a hardness of HRC45-48, and includes a fixing portion 61 connected to the first annular base 2 / the second annular base 3 and a bending portion 62 extending to one side of the second annular base 3 / the first annular base 2. In this embodiment, the angle between the fixing portion 61 and the bending portion 62 is 105°. The width of the bending portion 62 of the elastic steel plate 6 is greater than the width of the fixing portion 61, and the connection between the bending portion 62 and the fixing portion 61 is a trapezoidal structure. When the first elastic retaining ring 4 / the second elastic retaining ring 5 is installed, the fixing portion 61 of a piece of elastic steel plate 6 is first installed in the first annular base 2 / the second annular base 3 by rivets. When installing the next piece of elastic steel plate 6, the fixing portion 61 is connected with the previous piece in sequence, the bending portion 62 is staggered and stacked with the previous piece, and is connected with the previous piece at the trapezoidal connection. Then, the fixing portion 61 of the piece of elastic steel plate 6 is installed on the first annular base 2 / the second annular base 3. After that, the remaining elastic steel plates 6 are installed in the above manner. Generally, the single-side overlap width of adjacent elastic steel plates 6 is 25 mm, and the bending parts 62 of the first elastic retaining ring 4 and the second elastic retaining ring 5 formed by them are symmetrically arranged in a free state, so that the cross-section of the deformation cavity is an isosceles triangle structure, and the adsorption filling layer 7 therein is usually made of high-strength water-absorbing sponge material.
[0024] When installing the utility model, firstly, measurement and setting out should be carried out on site to determine the installation position and number of the annular bases; then, installation preparation work should be carried out, including ① making elastic steel plates 6 and installing them on the segmented annular bases by rivets to form multiple "steel plate base" component units; ② grinding work should be carried out according to the installation position of the first annular base 2 and the second annular base 3 on the pre-embedded steel ring of the tunnel or the extended steel ring 1 of the tunnel, and the grinding width on each side should be 50mm wider than the base to ensure the welding quality; then, according to the installation position of the first annular base 2, the above-mentioned "steel plate The base of the "base" component unit is welded in sequence (double-sided full welding is adopted) on the pre-buried steel ring of the portal or the extended steel ring 1 of the portal. During the installation process, the edges of the bent portions 62 of the adjacent elastic steel plates 6 need to be stacked in sequence; finally, according to the above method, the "steel plate base" component unit corresponding to the second annular base 3 is installed. It should be noted that the splicing seams of the adjacent segments of the first annular base 2 should be staggered with the splicing seams of the adjacent segments of the second annular base 3, and during the installation process, sponge filling is continuously performed between the two elastic retaining rings to complete the installation of the adsorption filling layer 7.
[0025] When the cutterhead of the shield machine M passes through, the cutterhead stops rotating and is pushed forward in the assembly mode / advance mode, directly passing through the first elastic retaining ring 4 and the second elastic retaining ring 5. Under the high-strength elastic force of each elastic steel plate 6, the first elastic retaining ring 4 and the second elastic retaining ring 5 are tilted as a whole toward the direction of the shield machine M, and the bending angles of the two are different. Finally, the free ends of the first elastic retaining ring 4 and the second elastic retaining ring 5 are separated from each other, so that the adsorption filling layer 7 in the deformation cavity is also connected to the shield machine M, thereby playing a role in sealing the tunnel door. The shield machine M continues to move forward. When the shield machine M is separated from the tunnel door sealing device, the first elastic retaining ring 4 and the second elastic retaining ring 5 automatically adjust the bending angle, rebound to the formed pipe segment to re-constitute the sealing cavity. At this time, the adsorption filling layer 7 is also connected to the formed pipe segment, thereby playing a role in sealing the tunnel door. Subsequently, the tunnel door is grouted twice around the pipe segment to make the slurry behind the pipe segment dense, so as to achieve the purpose of timely stabilizing the tunnel section pipe segment.
[0026] The utility model is installed in a pre-buried steel ring or an extended steel ring of a tunnel portal, and not only adopts a double-channel elastic retaining ring, but each elastic retaining ring is composed of a plurality of overlapping elastic steel plates. When a shield machine passes through, it can automatically wrap around the cutter head, the shield body, and the pipe segment by relying on its own high-strength elastic force, without the need for a hand winch to perform tensioning and other operations. It is simple and efficient, and can not only withstand bidirectional extrusion, but also enable the tunnel portal to achieve a good sealing effect, effectively reducing the starting and receiving risks of weak strata such as water-rich sand layers, and solving the problem of tunnel portal sealing failure caused by factors such as loose fitting of arc plates, damage to rubber cords, and penetration of seals under high water pressure in conventional sealing methods, thereby avoiding accidents such as ground collapse, pipeline settlement, and station flooding.
[0027] It should be noted that, in the description of the present invention, terms indicating orientation or positional relationships, such as "front", "rear", "left", "right", "vertical", "horizontal", "inside", "outside", etc., are based on the orientation or positional relationships shown in the drawings and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.
Claims
1. A shield construction tunnel door sealing device, suitable for shield starting tunnel door and shield receiving tunnel door, characterized in that: The sealing device comprises a first annular base and a second annular base which are arranged at intervals on a pre-embedded steel ring of a tunnel portal or an extended steel ring of a tunnel portal, a first elastic retaining ring being arranged on the first annular base, and a second elastic retaining ring being arranged on the second annular base, and the first elastic retaining ring and the second elastic retaining ring are both formed by overlapping a plurality of elastic steel plates in sequence; in a free state, the free ends of the first elastic retaining ring and the second elastic retaining ring contact each other to form a deformation cavity, and an adsorption filling layer is arranged in the deformation cavity; when a shield machine passes by, the first elastic retaining ring and the second elastic retaining ring are both inclined in the direction in which the shield machine moves forward, and the free ends of the first elastic retaining ring and the second elastic retaining ring are separated from each other, so that the adsorption filling layer in the deformation cavity is also connected to the shield machine; after the shield machine passes by, the first elastic retaining ring and the second elastic retaining ring automatically adjust the inclination angle, and the first elastic retaining ring, the second elastic retaining ring and the adsorption filling layer are all connected to the formed pipe segment.
2. The shield construction tunnel door sealing device according to claim 1 is characterized in that: The first annular base and the second annular base are both segmented structures with the same structure. Each segment includes a fixing plate welded to the pre-embedded steel ring of the portal or the extended steel ring of the portal and a pressing plate arranged on the surface thereof. Rivet mounting holes are arranged on the fixing plate and the pressing plate.
3. The shield construction tunnel door sealing device according to claim 2 is characterized in that: The elastic steel plate is formed by bending a 65Mn steel plate with a thickness of 1.0 mm and a hardness of HRC45-48, and includes a fixing portion connected to the first annular base / the second annular base and a bending portion extending toward one side of the second annular base / the first annular base.
4. The shield construction tunnel door sealing device according to claim 3 is characterized in that: The width of the bending portion of the elastic steel plate is greater than the width of the fixing portion, and the connection between the bending portion and the fixing portion is a trapezoidal structure.
5. The shield construction tunnel door sealing device according to claim 4 is characterized in that: The elastic steel plates are overlapped at adjacent fixing parts, and the overlap width is 25 mm.
6. The shield construction tunnel door sealing device according to claim 4, characterized in that: The bending parts of the first elastic retaining ring and the second elastic retaining ring are symmetrically arranged in a free state, and the cross-section of the deformation cavity is an isosceles triangle structure.
7. The shield construction tunnel door sealing device according to claim 1, characterized in that: The adsorption filling layer is made of sponge material.