An assembled tunnel post-earthquake repairing structure and a mounting method thereof

Abstract

The application relates to the technical field of tunnel post-earthquake repair, and discloses a fabricated tunnel post-earthquake repair structure and a mounting method thereof, which comprises the following steps: arranging a plurality of annular square steel pipes along the inner surface of a to-be-supported lining to form annular support assemblies, and arranging a plurality of annular support assemblies on the to-be-supported lining at uniform intervals along the length direction; arranging a plurality of longitudinal square steel pipes between two adjacent annular support assemblies and along the length direction of the to-be-supported lining, and connecting the two ends of the longitudinal square steel pipes with the two annular square steel pipes respectively; and covering an iron net on the inner surface of the to-be-supported lining, and connecting the iron net with the annular square steel pipes. The annular square steel pipes and the longitudinal square steel pipes are used to support the tunnel in the annular and longitudinal directions, the tunnel can be prevented from being damaged again after the earthquake, the polyurethane foam layer is filled in the annular square steel pipes and the longitudinal square steel pipes, the overall structural strength of the square steel pipes is improved, and the efficient repair of the tunnel after the earthquake is realized.

Description

Technical Field

[0001] This invention relates to the field of post-earthquake repair technology for tunnels, and in particular to a prefabricated post-earthquake repair structure for tunnels and its installation method. Background Technology

[0002] Earthquakes can cause tunnel lining cracks, road surface heave, misalignment, and even collapse. Current earthquake-resistant technologies primarily focus on earthquake-resistant structural design for tunnels and early warning systems before an earthquake strikes, but they cannot address rapid post-earthquake repair. If tunnels are not repaired promptly after an earthquake, it will affect the transportation of supplies, hinder rescue efforts, and consequently impact the reconstruction and recovery process in the disaster area. Therefore, rapid post-earthquake tunnel repair is of paramount importance.

[0003] To address the aforementioned technical problems, existing technologies have disclosed various countermeasures, such as: Patent CN222162646U discloses a post-earthquake arch repair structure for a traffic tunnel. By setting seismic isolation bearings on the inner surface of the initial support, it reduces the uneven deformation of the surrounding rock and structure caused by vibration, making the lining structure more adaptable to the deformation of the surrounding rock and improving the shock absorption capacity of the traffic tunnel under strong earthquakes.

[0004] Patent CN115030751A discloses a temporary protective canopy structure for tunnel lining, which is used to provide temporary protection for existing tunnels during the post-earthquake reconstruction process, thereby avoiding structural collapse caused by frequent aftershocks.

[0005] Patent CN110645013A discloses a tunnel vibration reduction structure for rapid post-earthquake repair. By setting a vibration reduction component body in the tunnel structure, the seismic energy is consumed and the seismic damage is concentrated on the component body, thereby reducing the damage to the tunnel structure.

[0006] As can be seen from the above, existing technologies mainly focus on tunnel design from the perspective of mitigating tunnel vibration damage and providing temporary protection for post-earthquake repair, but none of them consider how to quickly repair tunnels after an earthquake.

[0007] In view of this, how to quickly repair tunnels after an earthquake is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0008] The purpose of this invention is to provide a prefabricated tunnel post-earthquake repair structure and its installation method to solve the problems existing in the prior art.

[0009] To achieve the above objectives, the present invention provides a prefabricated tunnel post-earthquake repair structure, comprising: Multiple circumferential square steel pipes are arranged circumferentially along the inner surface of the lining to be supported to form a circumferential support assembly. Multiple circumferential support assemblies are evenly spaced along the length of the lining to be supported. Multiple longitudinal square steel pipes are located between two adjacent circumferential support components and arranged along the length of the lining to be supported, with their two ends connected to the two circumferential square steel pipes respectively. A wire mesh is installed on the inner surface of the lining to be supported, and the wire mesh is connected to a circumferential square steel pipe.

[0010] Furthermore, the circumferential square steel tube is hollow inside and one end of it is tapered inward to form a first connector. The first connector can be inserted into the other end of the circumferential square steel tube, and multiple circumferential square steel tubes are connected end to end to form a circumferential support assembly.

[0011] Furthermore, the longitudinal square steel tube is hollow inside and its two ends taper inward to form a second connector. The side of the circumferential square steel tube is provided with an insertion interface corresponding to the longitudinal square steel tube, and the second connector can be inserted into the insertion interface.

[0012] Furthermore, both the circumferential square steel tube and the longitudinal square steel tube are filled with a polyurethane foam layer.

[0013] Furthermore, both the circumferential square steel pipe and the longitudinal square steel pipe are provided with filling ports for filling polyurethane foam.

[0014] This invention also provides an installation method for a prefabricated tunnel post-earthquake repair structure, used for installing the prefabricated tunnel post-earthquake repair structure, comprising the following steps: S1: Multiple circumferential square steel pipes are installed circumferentially along the inner surface of the lining to be supported, and the multiple circumferential square steel pipes are connected end to end to form a circumferential support assembly. S2: While installing the circumferential square steel pipe, lay the iron mesh on the inner surface of the lining to be supported, and connect the iron mesh to the circumferential square steel pipe with iron wire. S3: Insert the second connector of the longitudinal square steel pipe into the connector of the circumferential square steel pipe; S4: Repeat steps S1-S3 to install and form multiple circumferential support components and connect the two ends of the longitudinal square steel pipe to the two circumferential square steel pipes respectively; S5: Liquid polyurethane foam is injected into the circumferential and longitudinal square steel pipes through the spray gun of the polyurethane foam spraying machine. After entering the circumferential and longitudinal square steel pipes, the liquid polyurethane foam expands and solidifies to form a polyurethane foam layer.

[0015] The present invention discloses the following technical effects: 1. This invention uses prefabricated circumferential and longitudinal square steel pipes to provide circumferential and longitudinal support for the tunnel, which can prevent secondary damage to the tunnel after an earthquake, and at the same time prevent debris from falling through the iron mesh. This prefabricated structure is easy to carry and install, and can be quickly transported to the tunnel construction site after an earthquake, thereby achieving the effect of efficient tunnel repair after an earthquake.

[0016] 2. Both the circumferential and longitudinal square steel pipes adopt a hollow structure, which is lightweight and does not require large lifting equipment for installation. In addition, both the circumferential and longitudinal square steel pipes are filled with polyurethane foam layers, which can improve the overall structural strength of the square steel pipes. This reduces the structural weight, increases the structural strength, and ensures installation efficiency, which is conducive to the efficient repair of tunnels after earthquakes. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram showing the fit between the circumferential square steel pipe and the longitudinal square steel pipe; Figure 3 This is a schematic diagram showing the fit between a circumferential square steel pipe and another circumferential square steel pipe. Figure 4 This is a schematic diagram showing the connection between the polyurethane foam spraying machine and the filling port. Among them, 1. Lining to be supported; 2. Circumferential square steel pipe; 201. First plug-in piece; 202. Plug-in interface; 3. Longitudinal square steel pipe; 301. Second plug-in piece; 4. Iron mesh; 5. Filling port; 6. Polyurethane foam spraying machine; 601. Spray gun. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Those skilled in the art will understand that the term "comprising" as used in this application means the presence of the stated features, integers, steps, operations, elements, and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof. It should be understood that when we say an element is "connected" or "coupled" to another element, it can be directly connected or coupled to the other element, or there may be intermediate elements present. Furthermore, "connected" or "coupled" as used herein can include wireless connections or wireless coupling. The term "and / or" as used herein includes all or any unit and all combinations of one or more associated listed items.

[0021] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0022] like Figures 1 to 4 As shown, an embodiment of the present invention provides a prefabricated tunnel post-earthquake repair structure, comprising: Multiple circumferential square steel pipes 2 are arranged circumferentially along the inner surface of the lining 1 to be supported to form a circumferential support assembly. Multiple circumferential support assemblies are evenly spaced along the length of the lining 1 to be supported. Multiple longitudinal square steel pipes 3 are located between two adjacent circumferential support components and are arranged along the length of the lining 1 to be supported, with their two ends connected to two circumferential square steel pipes 2 respectively. Iron mesh 4 is installed on the inner surface of the lining 1 to be supported, and iron mesh 4 is connected to the circumferential square steel pipe 2.

[0023] In this embodiment, the iron mesh 4 is made of lightweight iron because the iron mesh 4 is only used to prevent gravel from falling. The lining 1 to be supported mainly relies on the circumferential square steel pipe 2 and the longitudinal square steel pipe 3 for support. The strength requirement of the iron mesh 4 can be reduced, and the use of lightweight iron can further reduce the weight of the overall structure.

[0024] In this embodiment, the interior of the circumferential square steel tube 2 is hollow and one end of it is contracted inward to form a first plug-in 201. The first plug-in 201 can be inserted into the other end of the circumferential square steel tube 2, and multiple circumferential square steel tubes 2 are connected end to end to form a circumferential support assembly.

[0025] In this embodiment, the interior of the longitudinal square steel tube 3 is hollow and the two ends are tapered inward to form a second plug-in member 301. The side of the circumferential square steel tube 2 is provided with a plug-in interface 202 corresponding to the longitudinal square steel tube 3, and the second plug-in member 301 can be inserted into the plug-in interface 202.

[0026] In this embodiment, both the circumferential square steel pipe 2 and the longitudinal square steel pipe 3 are filled with polyurethane foam layers.

[0027] In this embodiment, both the circumferential square steel pipe 2 and the longitudinal square steel pipe 3 are provided with filling ports 5 for filling polyurethane foam.

[0028] It should be noted that the circumferential square steel pipes 2 and longitudinal square steel pipes 3 do not actually need to be connected to the lining 1 to be supported by additional connectors. For the circumferential square steel pipes 2, multiple circumferential square steel pipes 2 are connected end to end to form a ring structure. When the lining 1 to be supported collapses inward, extrusion force and support force are generated between adjacent circumferential square steel pipes 2 (the directions of the extrusion force and support force generated by the circumferential square steel pipes 2 at different positions are different), thus forming a stable support system. For the longitudinal square steel pipes 3, they are fixed by their connection with the circumferential square steel pipes 2. From an overall perspective, the bottom of the circumferential support assembly is connected to the bottom of the tunnel, which can unload part of the load to the bottom of the tunnel.

[0029] This invention also provides an installation method for a prefabricated tunnel post-earthquake repair structure, comprising the following steps: Before installation, a detailed survey of the lining to be supported (1) should be conducted, including the extent of collapse, crack distribution, and degree of lining damage. Simultaneously, the stability of the surrounding rock should be assessed to determine the risk of further collapse or rockfall, providing a basis for determining the location and strength of the circumferential square steel pipes (2) and longitudinal square steel pipes (3). Based on the tunnel's size, shape, and expected support strength requirements, a sufficient quantity and appropriate specifications of circumferential square steel pipes (2) and longitudinal square steel pipes (3) should be prepared. The quality of the circumferential square steel pipes (2) and longitudinal square steel pipes (3) should be inspected to ensure they are free from obvious deformation, cracks, or other defects.

[0030] S1: Install multiple circumferential square steel pipes 2 along the inner surface of the lining 1 to be supported. The multiple circumferential square steel pipes 2 are connected end to end to form a circumferential support assembly. During the connection process, ensure that the interface is flat. When installing the last circumferential square steel pipe 2, there may be dimensional deviations. The length of the circumferential square steel pipe 2 can be appropriately cut or the connection length with the adjacent circumferential square steel pipe 2 can be adjusted.

[0031] S2: While installing the circumferential square steel pipe 2, lay the iron mesh 4 on the inner surface of the lining 1 to be supported, and connect the iron mesh 4 to the circumferential square steel pipe 2 with iron wire. S3: Insert the second connector 301 of the longitudinal square steel pipe 3 into the connector 202 of the circumferential square steel pipe 2; S4: Repeat steps S1-S3 to install and form multiple circumferential support components and connect both ends of the longitudinal square steel pipe 3 to the two circumferential square steel pipes 2 respectively; S5: Liquid polyurethane foam is injected into the circumferential square steel pipe 2 and the longitudinal square steel pipe 3 through the spray gun 601 of the polyurethane foam spraying machine 6. Polyurethane foam is a high molecular polymer. In its liquid state, it has good fluidity and can flow autonomously within the circumferential square steel pipe 2 and the longitudinal square steel pipe 3, thereby filling the cavity. After entering the circumferential square steel pipe 2 and the longitudinal square steel pipe 3, the liquid polyurethane foam expands and solidifies to form a polyurethane foam layer, effectively improving the structural strength.

[0032] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0033] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0034] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0035] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A prefabricated tunnel post-earthquake repair structure, characterized in that, include: Multiple circumferential square steel pipes (2) are arranged circumferentially along the inner surface of the lining (1) to be supported to form a circumferential support assembly. Multiple circumferential support assemblies are evenly spaced along the length of the lining (1). Multiple longitudinal square steel pipes (3) are located between two adjacent circumferential support components and arranged along the length of the lining (1) to be supported, with their two ends connected to two circumferential square steel pipes (2) respectively. A wire mesh (4) is placed on the inner surface of the lining (1) to be supported, and the wire mesh (4) is connected to the circumferential square steel pipe (2).

2. The prefabricated tunnel post-earthquake repair structure according to claim 1, characterized in that, The circumferential square steel tube (2) is hollow inside and one end of it is contracted inward to form a first plug-in (201). The first plug-in (201) can be inserted into the other end of the circumferential square steel tube (2). Multiple circumferential square steel tubes (2) are connected end to end to form a circumferential support assembly.

3. The prefabricated tunnel post-earthquake repair structure according to claim 2, characterized in that, The longitudinal square steel tube (3) is hollow inside and its two ends taper inward to form a second plug-in (301). The side of the circumferential square steel tube (2) is provided with a plug-in interface (202) corresponding to the longitudinal square steel tube (3). The second plug-in (301) can be inserted into the plug-in interface (202).

4. The prefabricated tunnel post-earthquake repair structure according to claim 3, characterized in that, Both the circumferential square steel tube (2) and the longitudinal square steel tube (3) are filled with polyurethane foam layers.

5. A prefabricated tunnel post-earthquake repair structure according to claim 4, characterized in that, Both the circumferential square steel pipe (2) and the longitudinal square steel pipe (3) are provided with filling ports (5) for filling polyurethane foam.

6. A method for installing a prefabricated tunnel post-earthquake repair structure, used to install the prefabricated tunnel post-earthquake repair structure as described in claim 5, comprising the following steps: S1: Multiple circumferential square steel pipes (2) are installed circumferentially along the inner surface of the lining (1) to be supported. The multiple circumferential square steel pipes (2) are connected end to end to form a circumferential support assembly. S2: While installing the circumferential square steel pipe (2), the iron mesh (4) is laid on the inner surface of the lining (1) to be supported, and the iron mesh (4) is connected to the circumferential square steel pipe (2) by iron wire; S3: Insert the second connector (301) of the longitudinal square steel pipe (3) into the connector (202) of the circumferential square steel pipe (2); S4: Repeat steps S1-S3 to install and form multiple circumferential support components and connect the two ends of the longitudinal square steel pipe (3) to the two circumferential square steel pipes (2) respectively; S5: Liquid polyurethane foam is injected into the circumferential square steel pipe (2) and the longitudinal square steel pipe (3) through the spray gun (601) of the polyurethane foam spraying machine (6). After entering the circumferential square steel pipe (2) and the longitudinal square steel pipe (3), the liquid polyurethane foam expands and solidifies to form a polyurethane foam layer.

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