A full-assembled prefabricated slab track system with a limiting piece and a mounting method

Abstract

The application discloses a full-assembly prefabricated slab track system with a limiting piece and a mounting method, which comprises a shield tunnel segment, a prefabricated track bed foundation structure, a prefabricated slab track structure and a limiting device; the limiting device comprises a vertical connecting piece, a limiting piece and the like; the head of the vertical connecting piece is inserted into a pre-buried channel of the shield tunnel segment through a reserved hole of the prefabricated track bed foundation structure; the middle part of the vertical connecting piece is matched with a first rubber gasket and a first fastener; the limiting piece is sleeved on the upper part of the vertical connecting piece and has a ladder structure; the outer diameter of the lower part of the limiting piece is smaller than that of the upper part; a second reserved groove is formed in the top of the limiting piece; the lower part of the limiting piece is inserted into the first rectangular reserved groove; the upper part is located in the central through hole of the prefabricated slab track structure; a second rubber gasket sleeved on the tail of the vertical connecting piece is arranged in the second reserved groove of the top of the limiting piece; and the second rubber gasket is compressed by a second fastener matched with the vertical connecting piece.

Description

Technical Field

[0001] This invention relates to the field of prefabricated assembly component connection design and construction technology for rail transit, and in particular to a fully assembled prefabricated slab track system with limiting components and its installation method. Background Technology

[0002] Prefabricated assembly technology has developed rapidly in the fields of industrial and civil buildings, and has also been gradually studied and applied in the field of rail transit. Shield tunneling uses prefabricated segment assembly, subway stations use segmented assembly construction, and track bed structures use prefabricated track bed foundations and track slab structures. The application of prefabricated assembly technology in rail transit engineering can reduce the impact of rail transit construction on the environment and traffic, which is in line with the concept of green building development. At the same time, it can reduce labor costs, reduce the risks of on-site pouring construction, improve construction efficiency, and shorten the construction period.

[0003] However, the inventors discovered that the precast slab track structure used in rail transit engineering, which facilitates rapid construction, is described in patent CN111877054A. This structure, through pre-drilled holes penetrating the thickness of the track slab, contains an elastic buffer layer. A filling layer is then injected into the holes to create flexible restraints. The filling layer uses unreinforced synthetic fiber concrete or steel fiber concrete, which does not comply with the requirement in GB50157-2013, "Code for Design of Metro," that the track bed structure should be made of reinforced concrete. The patent (application number: 202210892403.6) uses a precast track bed structure that is effectively connected to the pre-embedded grooves of the tunnel segments with bolts, but lacks effective restraint measures for the precast track slab. Under the reciprocating load of the train, this can cause the precast slab track structure to move, affecting train safety. Summary of the Invention

[0004] The purpose of this invention is to provide a fully assembled precast slab track system with limiting components and its installation method. By designing a limiting device, it can achieve effective connection with shield tunnel segments and precast track bed foundation structure, and also effectively restrict the movement of the precast slab track structure. This addresses the problem of effective connection between shield tunnel segments and the fully precast track structure, as well as the problem of limiting the displacement of the precast slab track structure. At the same time, by wrapping an elastic buffer layer on the outside of the precast connection limiting device, the limiting device can provide flexible buffering and rigid restriction when the precast slab track structure moves under the action of train moving load. The elastic buffer layer helps to protect the limiting components. The limiting device is an important component of the integrated fully assembled precast track bed structure system for shield tunnels.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] In a first aspect, the present invention provides a fully assembled prefabricated slab track system with a limiting component, comprising a vertical connector, a first rubber washer, a second rubber washer, a first fastener, a second fastener, a limiting component, a plastic sleeve, and a waterproof elastic sealing gasket.

[0007] The head of the vertical connector passes through the reserved hole in the precast track bed foundation structure and is inserted into the embedded groove of the shield tunnel segment, and rotates 90 degrees; the middle part of the vertical connector cooperates with the first rubber washer and the first fastener. After the first rubber washer is fitted into the vertical connector, it is pressed into the first reserved groove of the precast track bed foundation structure by the first fastener.

[0008] The plastic sleeve is inserted from the tail of the vertical connector to the upper part of the vertical connector. The bottom of the plastic sleeve is pressed on the first fastener. A limiting member is fitted on the outer ring of the plastic sleeve. The limiting member is a stepped structure. The outer diameter of the lower part of the limiting member is smaller than the outer diameter of the upper part. A second reserved groove is opened on the top of the limiting member. The lower part of the limiting member is inserted into the first reserved groove, and the upper part is located in the central through hole of the prefabricated slab track structure. A second rubber gasket fitted on the tail of the vertical connector is set in the second reserved groove on the top of the limiting member. The second rubber gasket is pressed by the second fastener that cooperates with the vertical connector. A waterproof elastic sealing gasket is also installed in the second reserved groove.

[0009] Secondly, the present invention also proposes an installation method for a fully assembled prefabricated slab track system with limiting components, as follows:

[0010] After the shield tunnel segments containing the pre-embedded channels are assembled, the filling material inside the pre-embedded channels and the surface of the segments are cleaned. Then, the prefabricated track bed foundation structure is installed in sequence. The head of the vertical connector passes through the reserved hole of the prefabricated track bed foundation structure and is inserted into the pre-embedded channel of the shield tunnel segment. After rotating 90 degrees, the connector is fastened by the first rubber gasket and the first fastener.

[0011] Install the first elastic buffer layer in the first reserved groove, and install the plastic sleeve, the limiting piece with reserved perforation, the second rubber gasket, and the second fastener in sequence at the end of the connector. Install the waterproof elastic sealing gasket in the second reserved groove at the top of the limiting piece, install the second elastic buffer layer around the outside of the limiting piece, and install the prefabricated slab track structure system, rail and fasteners.

[0012] The beneficial effects of the above embodiments of the present invention are as follows:

[0013] This invention proposes a fully prefabricated slab track system with a limiting device and its installation method. By designing a limiting device and adopting prefabricated component assembly construction, it can achieve effective connection with shield tunnel segments and prefabricated track bed foundation structure, and also effectively restrict the movement of the prefabricated slab track structure. To solve the problem of effective connection between shield tunnel segments and fully prefabricated track structure and restrict the displacement of prefabricated slab track structure, the limiting device is wrapped with a first elastic buffer layer and a second elastic buffer layer on the outside of the limiting device. When the prefabricated slab track structure moves under the action of train moving load, the limiting device can play a role in flexible buffering and rigid restriction. The first elastic buffer layer and the second elastic buffer layer help protect the limiting device. The limiting device is one of the important components of the shield tunnel integrated fully prefabricated prefabricated track bed structure system.

[0014] This invention addresses the problems of slow concrete mixing, transportation, and on-site pouring speeds in the traditional process of forming limiting components for cast-in-place concrete. It proposes using a prefabricated limiting device in conjunction with a fully prefabricated track structure system. Prefabricated factory production ensures high precision and quality assurance; mechanized transportation and installation reduce labor intensity; and modular on-site assembly reduces construction steps. It features fast construction speed, high precision, and excellent results, significantly shortening the time required for traditional on-site concrete mixing, transportation, pouring, and curing. Furthermore, it can be combined with mechanized tunnel boring machine assembly equipment to achieve mechanized assembly of tunnel segments immediately after assembly, overcoming [the limitations of traditional methods]. Overcoming the disadvantages of existing on-site casting construction methods, such as high investment in specialized equipment, high labor intensity, difficulty in controlling construction accuracy, and slow construction speed, this project aims to achieve rapid construction by prefabricating and assembling all components of the track bed structure. This will maximize the speed and efficiency of track bed construction, establish a rapid construction system for fully prefabricated and assembled components of shield tunnel track beds, and ensure effective connection of track bed structure units through fully prefabricated assembly. This facilitates maintenance and repair during operation, aligns with the industry's green development concepts of prefabricated industrialization, assembly, energy conservation, and emission reduction, and promotes the high-quality development and application of prefabricated technology in the rail transit field. Attached Figure Description

[0015] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0016] Figure 1 This is a cross-sectional view of the limiting device proposed in this invention after installation.

[0017] Figure 2 This is a longitudinal sectional view of the limiting device proposed in this invention after installation.

[0018] Figure 3This is a top view of the limiting device proposed in this invention after installation;

[0019] Figure 4 This is a schematic diagram of the limiting device proposed in this invention;

[0020] Figure 5 This is a schematic diagram of the limiting device proposed in this invention;

[0021] In the diagram: 1-Limiting device; 2-Shield tunnel segment; 3-Precast track bed foundation structure; 4-Precast slab track structure system; 5-Embedded channel; 6-Vertical connector; 7-Reserved hole; 8-Rubber gasket; 8.1-First rubber gasket; 8.2-Second rubber gasket; 9-Fastener; 9.1-First fastener; 9.2-Second fastener; 10.1-First elastic buffer layer; 10.2-Second elastic buffer layer; 11.1-First rectangular reserved groove; 11.2-Second reserved groove; 12-Reserved perforation; 13-Limiting component; 14-Plastic sleeve; 15-Waterproof elastic sealing gasket; 16-Rail and fastener. Detailed Implementation

[0022] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the invention. Unless otherwise specified, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0023] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, unless otherwise expressly indicated by the invention, the singular form is also intended to include the plural form. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0024] For ease of description, the words "up," "down," "left," and "right" appearing in this invention only indicate that they are consistent with the up, down, left, and right directions of the accompanying drawings themselves, and do not limit the structure. They are merely for the purpose of facilitating the description of this invention and simplifying the description, and do not indicate or imply that the device or component 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.

[0025] As described in the background section, there are shortcomings in the existing technology. In order to solve the above-mentioned technical problems,

[0026] This invention proposes a fully assembled prefabricated slab track system with limiting components and its installation method.

[0027] In a typical embodiment of the present invention, see [reference needed]. Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, this embodiment discloses a fully assembled prefabricated slab track system with limiting components. The prefabricated slab track structure includes a prefabricated slab track structure system 4, a prefabricated track bed foundation structure 3, and a shield tunnel segment 2. The shield tunnel segment 2 is an arc-shaped structure. The prefabricated track bed foundation structure 3 is fixed to the inner ring of the shield tunnel segment 2. Pre-embedded channels 5 are present in the shield tunnel segment 2, and reserved channels 7 are provided on the prefabricated track bed foundation structure 3. Multiple reserved channels 7 are vertically arranged along the centerline of the prefabricated track bed foundation structure 3. A first rectangular reserved groove 11.1 is also provided at the top of the reserved channel 7. The axis of the first rectangular reserved groove 11.1 is coaxial with the axis of the reserved channel 7; the lower part of the precast slab track structure system 4 is embedded in the precast track bed foundation structure 3, and the upper part is higher than the precast track bed foundation structure 3. A rail and fastener 16 are set on the top of the precast slab track structure system 4, and a through hole is also set in the center of the precast slab track structure system 4. The through hole is coaxial with the reserved channel 7 on the precast track bed foundation structure 3; the limiting device 1 in this embodiment is used to limit the movement of the precast slab track structure system 4, the precast track bed foundation structure 3 and the shield tunnel segment 2 in the circumferential and radial directions.

[0028] Furthermore, in this embodiment, several limiting devices can be arranged along the length direction of the precast slab track structure system 4, and several limiting devices are evenly arranged on the precast slab track structure system 4.

[0029] Furthermore, in this embodiment, the limiting device is positioned at the center between two parallel rails.

[0030] Specifically, the limiting device proposed in this embodiment consists of a vertical connector 6, a first rubber washer 8.1, a second rubber washer 8.2, a first fastener 9.1, a second fastener 9.2, a first elastic buffer layer 10.1, a second elastic buffer layer 10.2, a limiting component 13, a plastic sleeve 14, and a waterproof elastic sealing gasket 15.

[0031] The head of the vertical connector 6 passes through the reserved hole 7 of the precast track bed foundation structure 3 and is inserted into the pre-embedded channel 5 of the shield tunnel segment 2. The pre-embedded channel 5 is a cross-shaped channel. When the head of the vertical connector 6 extends into the pre-embedded channel 5 and then rotates 90 degrees, the vertical connector 6 is locked and fixed in the pre-embedded channel 5. The middle part of the vertical connector 6 cooperates with the first rubber washer 8.1 and the first fastener 9.1. After the first rubber washer 8.1 is fitted into the vertical connector 6, it is pressed into the first rectangular reserved groove 11.1 of the precast track bed foundation structure 3 by the first fastener 9.1. The connection between the precast track bed foundation structure 3 and the precast slab track structure system 4 is realized by the vertical connector 6 and the first fastener 9.1.

[0032] Furthermore, a first elastic buffer layer 10.1 is provided in the inner circle of the first rectangular reserved groove 11.1; a second elastic buffer layer 10.2 is provided in the central through hole of the precast slab track structure system 4; by wrapping the first elastic buffer layer 10.1 and the second elastic buffer layer 10.2 around the outside of the limiting member, the precast slab track structure will move under the action of the train moving load, and the limiting device can play a role in flexible buffering and rigid restriction. The first elastic buffer layer 10.1 and the second elastic buffer layer 10.2 are beneficial to protecting the limiting device.

[0033] Furthermore, the plastic sleeve 14 is inserted from the tail of the vertical connector 6 to the upper part of the vertical connector 6. The bottom of the plastic sleeve 14 is pressed onto the first fastener 9.1. A limiting member 13 is fitted around the outer ring of the plastic sleeve 14. The limiting member 13 is a stepped structure. A second reserved groove 11.2 is provided at the top of the limiting member 13. The lower part of the limiting member 13 is rectangular, and the upper part is cylindrical. The lower part of the limiting member 13 mates with the inner ring of the first elastic buffer layer 10.1. The upper part is located in the through hole at the center of the precast slab track structure system 4 and mates with the inner ring of the second elastic buffer layer 10.2. The second elastic buffer layer 10.2 is installed in the through hole at the center of the precast slab track structure system 4; a second rubber gasket 8.2 is set in the second reserved groove 11.2 at the top of the limiting member 13 and fitted at the tail of the vertical connector 6, and the second rubber gasket 8.2 is pressed by the second fastener 9.2 that cooperates with the vertical connector 6, thereby realizing the connection between the precast slab track structure system 4 and the precast track bed foundation structure 3; finally, the precast slab track structure system 4, the precast track bed foundation structure 3, and the shield tunnel segment 2 are connected together to form a whole through the vertical connector 6, the limiting member, and the pre-tightening member.

[0034] Furthermore, a waterproof elastic sealing gasket 15 is also installed on the top of the second reserved groove 11.2. The waterproof elastic sealing gasket 15 is used to seal and waterproof the entire limiting device.

[0035] Furthermore, the design of the aforementioned plastic sleeve 14 can provide insulation to a certain extent.

[0036] Furthermore, the lower part of the aforementioned limiting member 13 is configured as a rectangular structure, which cooperates with the first rectangular reserved groove 11.1 to prevent the limiting member 13 from rotating; at the same time, the upper part of the limiting member 13 is configured as a cylinder, which cooperates with the through hole in the center of the prefabricated slab track structure system 4.

[0037] In this embodiment, the vertical connector 6 is a T-bolt, the first fastener 9.1 is a nut, and the second fastener 9.2 is a nut.

[0038] Furthermore, when the rail vehicle is moving forward in a straight line, the vehicle exerts a backward force on the precast slab track structure, and then the limiting device exerts a forward reaction force on the precast slab track structure to prevent it from moving backward; when the rail vehicle turns, the vehicle exerts a centrifugal force on the precast slab track structure towards the inside of the arc, and then the limiting device exerts a force in the opposite direction on the precast slab track structure to prevent it from moving inward.

[0039] The specific installation method is as follows:

[0040] After the shield tunnel segment 2 containing the pre-embedded channel 5 is assembled, and the internal filling material of the pre-embedded channel 5 and the surface of the segment are cleaned, the precast track bed foundation structure 3 is installed in sequence using professional assembly equipment. The head of the vertical connector 6 passes through the reserved hole 7 of the precast track bed foundation structure 3 and is inserted into the pre-embedded channel 5 of the shield tunnel segment 2. After rotating 90 degrees, the vertical connector 6 is fastened by the first rubber gasket 8.1 and the first fastener 9.1. The first elastic buffer layer 10.1 is installed in the first reserved groove 11.1. At the end of the vertical connector 6, the plastic sleeve 14, the limiting piece 13 with the reserved perforation 12, the second rubber gasket 8.2, and the second fastener 9.2 are installed in sequence. The waterproof elastic sealing gasket 15 in the second reserved groove 11.2 at the top of the limiting piece 13 is installed. The second elastic buffer layer 10.2 around the outside of the limiting piece is installed. The precast slab track structure system 4 and the rails and fasteners 16 are installed.

[0041] Finally, it should be noted that relational terms such as first and second are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations.

[0042] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A full assembled precast slab track system with a limiting device, comprising a shield tunnel segment, a precast track bed foundation structure, a precast slab track structure and a limiting device; characterized in that, The limiting device comprises a vertical connecting piece, a first rubber gasket, a second rubber gasket, a first fastener, a second fastener, a limiting piece and a waterproof elastic sealing gasket. The head of the vertical connecting piece is inserted into the pre-embedded groove of the shield tunnel segment through the reserved hole of the prefabricated track bed foundation structure, and is rotated by 90 degrees; the middle part of the vertical connecting piece is matched with the first rubber gasket and the first fastener, the first rubber gasket is sleeved into the vertical connecting piece, and the first rubber gasket is pressed against the first rectangular reserved groove of the prefabricated track bed foundation structure through the first fastener. The limiting piece is sleeved on the upper part of the vertical connecting piece, the limiting piece has a stepped structure, the outer diameter of the lower part of the limiting piece is smaller than that of the upper part, a second reserved groove is formed in the top of the limiting piece, the lower part of the limiting piece is inserted into the first rectangular reserved groove, the upper part is located in the central through hole of the prefabricated track structure, the second rubber gasket sleeved on the tail of the vertical connecting piece is arranged in the second reserved groove of the top of the limiting piece, and the second rubber gasket is pressed through the second fastener matched with the vertical connecting piece; the waterproof elastic sealing gasket is also arranged in the second reserved groove. A first elastic buffer layer is arranged in the inner ring of the first reserved groove; and a second elastic buffer layer is arranged in the central through hole of the prefabricated track structure. The plastic sleeve is sleeved from the tail of the vertical connecting piece to the upper part of the vertical connecting piece, the bottom of the plastic sleeve is pressed on the first fastener, and the limiting piece is sleeved on the outer ring of the plastic sleeve.

2. The full-fabricated panel track system with a stopper according to claim 1, wherein, A plurality of the full-assembled prefabricated track systems with limiting pieces are arranged along the length direction of the prefabricated track structure.

3. The full assembled panel track system with stopper according to claim 1, wherein, Along the width direction, the full-assembled prefabricated track system with limiting pieces is located at the central position of the prefabricated track structure.

4. The full-fabricated panel track system with a stopper according to claim 1, wherein, The vertical connecting piece is a T-shaped bolt.

5. The full-fabricated panel track system with a stopper according to claim 1, wherein, The upper part of the limiting piece is in a cylindrical shape, and the lower part is in a rectangular shape, and the lower part is matched with the first rectangular reserved groove.

6. The full-fabricated panel track system with a stopper according to claim 1, wherein, The first fastener and the second fastener are nuts.

7. The installation method of the full-assembled prefabricated track system with limiting pieces according to any one of claims 1-6, wherein after the shield tunnel segment with the pre-embedded groove is assembled, and the inside of the pre-embedded groove and the surface of the segment are cleaned, the prefabricated track bed foundation structure is installed in sequence, the head of the vertical connecting piece is inserted into the pre-embedded groove of the shield tunnel segment through the reserved hole of the prefabricated track bed foundation structure, and is rotated by 90 degrees, and then the connecting piece is fastened through the first rubber gasket and the first fastener; the first elastic buffer layer is installed in the first reserved groove, the plastic sleeve, the limiting piece with the reserved perforation, the second rubber gasket, the second fastener are installed in sequence at the end of the connecting piece, the waterproof elastic sealing gasket in the second reserved groove at the top of the limiting piece is installed, the second elastic buffer layer around the outer side of the limiting piece is installed, and the prefabricated track structure system, the steel rail and the fastening accessories are installed.

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