Portal reinforcing structure and portal lining structure

Abstract

The utility model discloses a tunnel portal reinforcing structure and a tunnel portal lining structure, the tunnel portal reinforcing structure comprises a steel ring beam used for being connected with the tunnel portal lining structure, the steel ring beam comprises a plurality of profile steel components used for being attached to the tunnel portal lining structure, and the profile steel components are connected to form an annular assembly used for being installed on the outer periphery of a tunnel portal in a surrounding mode; the tunnel portal lining structure is connected with the tunnel portal reinforcing structure, a steel structure circular ring used for being connected with a steel sleeve is arranged on the inner side of the tunnel portal lining structure, a steel structure plate is arranged on the outer side of the tunnel portal lining structure, and a through hole corresponding to the steel sleeve is formed in the steel structure plate. Compared with the prior art, the tunnel portal lining structure and the tunnel portal reinforcing structure solve the technical problems that in the prior art, special lining ring composite pipe pieces are complex in production and machining, large in steel consumption, high in pipe piece manufacturing cost and occupy available space.

Description

Technical Field

[0001] The utility model relates to the technical field of tunnel door reinforcement, in particular to a tunnel door reinforcement structure and a tunnel door lining structure. Background Art

[0002] The subway connecting channel is a cross channel between two main tunnels. Its construction conditions are harsh and there are many constraints. It is a tough "bone" in subway construction. Although the amount of earth excavation required for the subway connecting channel is small, it is constructed in an existing tunnel with a small working space and restricted construction conditions for large equipment, which is prone to sand flow and water seepage in the tunnel. The mechanical construction technology of the connecting channel is mainly characterized by "micro-reinforcement, machinability, strict sealing, and strong support". Its advantages of fast construction, high safety, and low environmental impact have opened up new ideas for the construction of connecting channels.

[0003] At present, special lining rings used for mechanical communication channel construction are Figure 1 and Figure 2 The figure shows a steel plate-concrete composite segment composed of an inner arc plate, annular plate, rib plate, studs and concrete. Generally speaking, the maximum stress in the construction of the connecting channel occurs after the composite segment portal is broken. In order to reduce the impact of the broken portal on the weakening of the main tunnel structure rigidity, the composite segment uses a large amount of steel and is complex to produce and process, which greatly increases the segment cost and hinders the promotion of technology.

[0004] In response to the above problems, some scientific research institutions and personnel have proposed the following direct or indirect solutions:

[0005] (1) The invention patent with application publication number CN113338993A discloses "A reinforced ring beam structure for a communication channel and its construction method", such as Figure 3 and Figure 4 As shown, its structure includes: a concrete cast ring beam body 10, a tunnel door 110, the tunnel door 110 is arranged on the side wall of the main tunnel 60, and the ring beam body 10 is a concrete structure cast outside the outer circumference of the tunnel door 110; a steel ring 20 is embedded in the tunnel door 110, and the steel ring 20 is used to be welded with the steel sleeve to form a closed whole at the time of initial reception; a plurality of grouting pipes 30, water-expandable rubber 40 and water stop strips 50 are embedded between the outer wall of the ring beam body 10 and the steel ring 20. That is, a reinforced ring beam capable of improving the structural strength of the segment at the tunnel door breaking position and a construction method of the reinforced ring beam are provided, and the rigidity of the segment where the tunnel door is located is improved and the stress concentration phenomenon is reduced by planting steel bars, tying steel bars, erecting molds, and casting concrete ring beams on the inner wall of the main tunnel segment.

[0006] (2) The paper “Numerical simulation of mechanical response of segmental lining portal structure during mechanical tunnel construction of connecting passages in shield tunnels” also discloses a technical solution of pouring reinforced concrete ring beams on the inside of the cutting area to reinforce the portal, thereby reducing construction costs and improving the overall stiffness of the structure to a greater extent.

[0007] The reinforcement structure mentioned in the above invention patent and paper can solve the problem of high cost of structural reinforcement and composite pipe segments to a certain extent by planting steel bars on the inner surface of the special lining ring and casting concrete in situ. However, planting steel bars and casting concrete in situ on the formwork in the narrow space of the main tunnel is not only inconvenient to operate, but also takes up a lot of construction time of the connecting channel, causing delays in the construction period, and also occupies the space in the main tunnel, reducing the space utilization rate of the main tunnel. In addition, the portal ring beam structure only strengthens the special lining ring pipe segment. The structure does not connect the main tunnel and the connecting channel into a whole. The structural rigidity at the T-joint is poor, which poses obvious safety hazards.

[0008] Based on the above situation, it is necessary to develop a safe, practical and low-cost tunnel portal reinforcement structure and tunnel portal lining structure.

[0009] It should be particularly noted that the above technical information is only intended to deepen the understanding of the overall background technology of the present utility model, and should not be regarded as admitting or implying in any form that the above technical information constitutes the prior art already known to those skilled in the art. Utility Model Content

[0010] In view of the deficiencies in the above-mentioned background technology, the utility model proposes a tunnel door reinforcement structure and a tunnel door lining structure, which solve the technical problems that the existing tunnel door reinforcement structure has complex process steps and occupies available space.

[0011] The technical solution of this application is:

[0012] A portal reinforcement structure includes a steel ring beam for connecting with a portal lining structure. The steel ring beam includes a plurality of steel sections for fitting with the portal lining structure. The steel sections are connected to form an annular assembly for installation on the periphery of the portal.

[0013] This technical solution provides a reinforcement structure attached to the portal lining structure. Not only is its own structure and connection structure simple, but it is also composed of a number of steel members, which reduces the installation and disassembly time. The steel ring beam can also be reused, saving construction costs. In addition, by adjusting the number and connection relationship of the steel members, various shapes of steel ring beams can be constructed. For example, by connecting four steel members end to end, a steel ring beam with a rectangular or positive projection can be constructed; by connecting three steel members end to end, a steel ring beam with a triangular projection can be constructed; by connecting four steel members crosswise, a steel ring beam with a tic-tac-toe projection can be constructed; by connecting five steel members end to end, a steel ring beam with a pentagonal projection can be constructed, and so on. When in use, there are multiple options for the connection method between the steel ring beam and the portal lining structure, and the connection method between the various steel components. For example, the steel ring beam and the portal lining structure are connected by embedded parts using any one or more of bolt connection, welding, and riveting. The various steel components can also be connected by bolt connection, welding, and riveting. When turnover is required, corresponding methods such as removing bolts or rivets or cutting can be used. This not only avoids the use of effective space after dismantling, but also facilitates dismantling, turnover and reuse.

[0014] As a preferred technical solution for the portal reinforcement structure, the steel ring beam is connected to the portal lining structure through embedded bolts or embedded bolt sleeves provided on the portal lining structure. This technical solution provides how to better connect the steel ring beam with the corresponding portal lining structure when used, that is, the steel ring beam is installed by bolt connection, and the portal lining structure adopts embedded bolts or embedded bolt sleeves during prefabrication, then the steel ring beam is provided with mounting holes and nuts corresponding to the embedded bolts, or the steel ring beam is provided with high-strength bolts corresponding to the embedded bolt sleeves.

[0015] As a preferred technical solution for the portal reinforcement structure, the steel ring beam is welded to the embedded steel plate provided on the portal lining structure. This technical solution provides another installation method for the steel ring beam when it is used, that is, it is connected to the portal lining structure by welding. When the portal lining structure is prefabricated, an embedded steel plate is provided, or a post-installed steel plate is installed on the prefabricated portal lining structure at a later stage, and the steel ring beam is welded to the embedded steel plate or the post-installed steel plate, thereby realizing the connection between the steel ring beam and the portal lining structure. When it needs to be dismantled for turnover, cutting welding can be used to cut off the connection between the embedded steel plate or the post-installed steel plate and the steel ring beam.

[0016] As a preferred technical solution for the portal reinforcement structure, the steel ring beam is connected to the portal lining structure by expansion bolts or chemical bolts. This technical solution provides another installation method for the steel ring beam when it is used, that is, it is connected to the portal lining structure by post-installed bolts. When the portal lining structure is prefabricated, it is not necessary to set embedded connectors. High-strength expansion bolts can be installed on site to connect the steel ring beam and the portal lining structure.

[0017] As a preferred technical solution for the portal reinforcement structure, the steel ring beam and the portal lining structure are fitted together through a gasket. Although the steel ring beam and the portal lining structure are contoured structures with fitting surfaces of the same curvature, it is difficult for the steel ring beam and the portal lining structure to be naturally fitted together due to tunnel deformation, misalignment, etc. Therefore, a gasket is provided between the steel ring beam and the portal lining structure for leveling during installation.

[0018] As a preferred technical solution for the portal reinforcement structure, the steel member includes a transverse steel member and a vertical steel member, a surface of the vertical steel member that fits the portal lining structure is arc-shaped, and the two transverse steel members are connected between the two vertical steel members.

[0019] A portal lining structure is connected to the portal reinforcement structure described in any one of the above technical solutions.

[0020] As a preferred technical solution for the portal lining structure, a steel structure ring for connecting the steel sleeve is arranged on the inner side of the portal lining structure, and a steel structure plate is arranged on the outer side, and through holes corresponding to the steel sleeve are arranged on the steel structure plate.

[0021] As a preferred technical solution for the portal lining structure, the steel structure ring is located within the range surrounded by the steel ring beam, and the coverage range of the steel structure plate is opposite to the inside and outside of the coverage range of the steel ring beam.

[0022] As an optimal technical solution for the portal lining structure, the portal lining structure is a connecting channel portal lining ring, the portal is a connecting channel portal, the connecting channel portal lining ring includes a plurality of tunnel segments, the steel structure ring includes a plurality of inner arc steel plates respectively embedded in the inner side of each of the tunnel segments, and the steel structure plate includes a plurality of outer arc steel plates respectively embedded in the outer side of each of the tunnel segments.

[0023] Compared with the prior art, the portal lining structure and portal reinforcement structure provided by the utility model solve the technical problems in the prior art of complex production and processing of special lining ring composite segments, large amount of steel used, high segment cost, and occupation of available space. This patented technology installs a steel ring beam for temporary reinforcement on the inner arc surface of the portal lining structure, embeds an outer arc steel plate on the outer arc surface of the portal lining structure, and reduces the use of steel beams on the basis of ensuring the safety of the portal lining ring structure, thereby achieving the reuse of reinforced steel ring beams and saving construction costs. The technical solution provided by the utility model can be used for other portals with similar functional requirements in addition to being used for communication channel portals. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present utility model, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 Cross-sectional view of a special lining ring constructed for a mechanically constructed access channel;

[0026] Figure 2 for Figure 1 Schematic diagram of the structure of the inner arc plate, ring plate, rib plate and studs;

[0027] Figure 3 It is a transverse cross-sectional view of a connecting channel reinforcement ring beam structure on a tunnel in the prior art;

[0028] Figure 4 for Figure 3 Sectional view of the AA plane;

[0029] Figure 5 is a cross-sectional view of the portal lining structure and the portal reinforcement structure;

[0030] Figure 6 for Figure 5 BB section view;

[0031] Figure 7 for Figure 5 Right view of;

[0032] Figure 8 for Figure 5 A partial enlarged view of .

[0033] Description of Figure Numbers:

[0034] Ring beam body 10, tunnel door 110, steel ring 20, grouting pipe 30, water-swelling rubber 40, water stop strip 50, main tunnel 60

[0035] Communication passage portal lining ring 1, steel ring beam 2, communication passage portal 3, steel sleeve 4, inner arc steel plate 5, outer arc steel plate 6, embedded bolt sleeve 7, high-strength bolt 8, communication passage 9. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the core concept of the utility model and the following embodiments, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0037] The present application provides these embodiments to make the present application thorough and complete, and to fully express the scope of the present application to those skilled in the art. It should be noted that unless otherwise specifically stated, the relative arrangement of the parts and steps, the composition of the materials, the numerical expressions and the numerical values ​​set forth in these embodiments should be interpreted as being merely exemplary, and not as limiting.

[0038] It should be noted that, in the description of this application, unless otherwise specified, the meaning of "several" is greater than or equal to two; the terms "upper", "lower", "left", "right", "inner", "outer", "axial", "radial" and the like indicate positions or positional relationships only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on this application. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0039] In addition, the words "first", "second" and similar words used in this application do not indicate any order, quantity or importance, but are only used to distinguish different parts. "Vertical" does not mean vertical in the strict sense, but is within the tolerance range. "Parallel" does not mean parallel in the strict sense, but is within the tolerance range. "Include" or "comprising" and similar words mean that the elements before the word include the elements listed after the word, and do not exclude the possibility of including other elements.

[0040] It should also be noted that in the description of this application, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be internal communication between two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances. When a specific device is described as being located between a first device and a second device, there may or may not be an intermediate device between the specific device and the first device or the second device.

[0041] All terms used in this application have the same meaning as those understood by those of ordinary skill in the art to which this application belongs, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries, such as general dictionaries, should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and should not be interpreted in an idealized or extremely formal sense, unless explicitly defined herein.

[0042] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0043] A portal reinforcement structure, such as Figure 6 and Figure 8 As shown, it includes a steel ring beam 2 for connecting to the portal lining structure. The steel ring beam 2 includes a plurality of steel members for fitting with the portal lining structure. After the steel members are connected, they form an annular assembly for installation on the outer periphery of the portal.

[0044] The steel structure can be a single-web I-beam, or an angle steel, or a channel steel, or a double-web I-beam, or a square steel tube, or a steel structure with other cross-sectional shapes, but it needs to be ensured that the steel structure can fit with the inner surface of the portal lining structure in the extension direction.

[0045] The present technical solution provides a reinforcement structure attached to the portal lining structure, which not only has a simple structure and connection structure, but also is composed of a number of steel components, which reduces the installation and disassembly time. The steel ring beam 2 can also be reused, saving construction costs. In addition, by adjusting the number and connection relationship of the steel components, steel ring beams 2 of various shapes can be constructed.

[0046] like Figure 6As shown, for example, by connecting four steel members end to end, a steel ring beam 2 with a rectangular or positive projection can be constructed; by connecting three steel members end to end, a steel ring beam with a triangular projection can be constructed; by cross-connecting four steel members, a steel ring beam with a tic-tac-toe projection can be constructed; by connecting five steel members end to end, a steel ring beam with a pentagonal projection can be constructed, and so on.

[0047] When in use, there are multiple options for the connection method between the steel ring beam 2 and the portal lining structure, and the connection method between each steel structure component. For example, the steel ring beam 2 and the portal lining structure are connected by embedded parts using any one or more of bolt connection, welding, and riveting. The various steel structures can also be connected by bolt connection, welding, and riveting. When turnover is required, corresponding methods such as removing bolts or rivets or cutting can be used. This not only avoids the use of effective space after dismantling, but also facilitates dismantling, turnover and reuse.

[0048] On the basis of the above embodiments, as a preferred embodiment of the portal reinforcement structure, the steel ring beam 2 is connected to the portal lining structure through embedded bolts or embedded bolt sleeves 7 provided on the portal lining structure. The inner ends of the embedded bolts or embedded bolt sleeves 7 are connected to embedded plates located in the portal lining structure, and the embedded plates serve as anchoring structures for the embedded bolts or embedded bolt sleeves 7. This technical solution provides a method for better connecting the steel ring beam 2 with the corresponding portal lining structure when used, such as Figure 8 As shown, the steel ring beam 2 is installed by bolt connection, and the portal lining structure adopts embedded bolts or embedded bolt sleeves 7 during prefabrication. Then, mounting holes and nuts corresponding to the embedded bolts are provided on the steel ring beam 2, or high-strength bolts 8 corresponding to the embedded bolt sleeves 7 are provided on the steel ring beam 2.

[0049] As another preferred embodiment of the portal reinforcement structure, the steel ring beam 2 is welded to the embedded steel plate provided on the portal lining structure, that is, the inner surface of the portal lining structure has an exposed embedded steel plate, so that the steel ring beam 2 can be directly welded to it. Of course, the part of the embedded steel plate located in the portal lining structure can be connected to various anchoring structures, and the anchoring structure is located inside the portal lining structure.

[0050] This technical solution provides another installation method for the steel ring beam 2 when it is used, that is, to connect it with the portal lining structure by welding. When the portal lining structure is prefabricated, a pre-buried steel plate is set, or a post-installed steel plate is installed on the prefabricated portal lining structure at a later stage, and the steel ring beam 2 is welded to the pre-buried steel plate or the post-installed steel plate, thereby realizing the connection between the steel ring beam 2 and the portal lining structure. When it is necessary to dismantle it for turnover, the connection between the pre-buried steel plate or the post-installed steel plate and the steel ring beam 2 can be cut off by cutting welding.

[0051] As another preferred embodiment of the portal reinforcement structure, the steel ring beam 2 is connected to the portal lining structure by expansion bolts or chemical bolts. This technical solution provides another installation method of the steel ring beam 2 when it is used, that is, it is connected to the portal lining structure by post-installed bolts. When the portal lining structure is prefabricated, it is not necessary to set embedded connectors. High-strength expansion bolts can be installed on site to connect the steel ring beam 2 and the portal lining structure.

[0052] As another preferred embodiment of the portal reinforcement structure, the steel ring beam 2 is fitted with the portal lining structure through a gasket. Although the steel ring beam 2 and the portal lining structure are contoured structures with fitting surfaces of the same curvature, it is difficult for the steel ring beam 2 and the portal lining structure to be naturally fitted due to tunnel deformation, misalignment, etc. Therefore, a gasket is provided between the steel ring beam 2 and the portal lining structure for leveling during installation.

[0053] On the basis of the above embodiments, as a preferred embodiment of the portal reinforcement structure, the steel member includes a transverse steel member and a vertical steel member, the side of the vertical steel member that fits with the portal lining structure is arc-shaped, and the two transverse steel members are connected between the two vertical steel members.

[0054] On the basis of the above-mentioned embodiment, as a preferred embodiment of the portal reinforcement structure, the spacing between the two transverse steel members is equal to the spacing between the two vertical steel members.

[0055] On the basis of the above-mentioned embodiment, as a preferred embodiment of the portal reinforcement structure, the length of the vertical steel member is greater than the length of the horizontal steel member.

[0056] A tunnel lining structure, such as Figure 5 As shown, a portal reinforcement structure as described in any of the above embodiments is connected.

[0057] On the basis of the above embodiments, as a preferred embodiment of the tunnel door lining structure, as Figure 6 and Figure 7 As shown, a steel structure ring for connecting the steel sleeve 4 is arranged on the inner side of the portal lining structure, and a steel structure plate is arranged on the outer side, and a through hole corresponding to the steel sleeve 4 is arranged on the steel structure plate.

[0058] On the basis of the above embodiments, as a preferred embodiment of the portal lining structure, the steel structure ring is located within the range surrounded by the steel ring beam 2, and the coverage range of the steel structure plate is relative to the inside and outside of the coverage range of the steel ring beam 2.

[0059] On the basis of the above embodiments, as a preferred embodiment of the portal lining structure, the portal lining structure is a connecting channel portal lining ring 1, the portal is a connecting channel portal 3, the connecting channel portal lining ring 1 includes a plurality of tunnel segments, the steel structure ring includes a plurality of sections of inner arc steel plates 5 respectively embedded in the inner side of each of the tunnel segments, and the steel structure plate includes a plurality of sections of outer arc steel plates 6 respectively embedded in the outer side of each of the tunnel segments.

[0060] In order to ensure the structural stress safety of the special lining ring during the construction of the communication channel, and at the same time, the portal reinforcement structure is easy to disassemble and assemble, can be reused, and has a low cost, as a preferred embodiment of the portal lining structure, it includes: a communication channel portal lining ring 1; a steel ring beam 2, which is composed of four prefabricated steel sections and is installed on the inner arc surface of the special lining ring segment to strengthen the structural rigidity of the communication channel portal lining ring 1; a communication channel portal 3; a steel sleeve 4, which is connected to the inner arc steel plate 5 on the communication channel portal lining ring 1 , used for waterproof sealing when the communication channel tunnel boring machine starts and receives; inner arc steel plate 5, embedded in the inner arc surface of the communication channel tunnel lining ring 1 segment, used for welding steel sleeve 4; outer arc steel plate 6, embedded in the outer arc surface of the communication channel tunnel lining ring 1 segment, used to bear part of the tensile stress on the outer side of the communication channel tunnel lining ring 1 segment; embedded bolt sleeve 7, embedded in the communication channel tunnel lining ring 1; high-strength bolts 8, connect the steel ring beam 2 and the communication channel tunnel lining ring 1 into a whole; communication channel 9.

[0061] The implementation steps of this implementation are:

[0062] S1, firstly, the tunnel segments with embedded inner arc steel plates 5, outer arc steel plates 6 and embedded bolt sleeves 7 are produced in the segment processing plant and assembled into the main tunnel.

[0063] S2, such as Figure 5 , Figure 8 As shown, the prefabricated steel required for producing the steel ring beam 2 is connected to the lining ring 1 of the communication channel portal by high-strength bolts 8 at the construction site, and the prefabricated steel is welded to form the steel ring beam 2 as a whole.

[0064] S3, such as Figure 5 , Figure 6 , Figure 7 As shown, the steel sleeve 4 is welded together with the embedded inner arc steel plate 5 on the inner surface of the lining ring 1 of the communication channel portal. Then the communication channel 9 begins to be excavated. The lining ring 1 of the communication channel portal, the steel ring beam 2 and the outer arc steel plate 6 jointly bear the stress concentration generated after the communication channel portal 3 is broken.

[0065] S4, after the excavation of the connecting channel is completed, the stress of the connecting channel portal lining ring 1 segment tends to be stable, and the steel ring beam 2 is removed and transported to the next work area.

[0066] In this embodiment, as shown above, the steel ring beam 2 is installed on the inner surface of the lining ring 1 of the communication channel portal, and the lining ring 1 of the communication channel portal and the steel ring beam 2 form a whole body that bears force together, and the structural rigidity of the communication channel portal 3 is strengthened, thereby ensuring the safety of the main tunnel structure during the construction of the communication channel. The steel ring beam 2 is composed of four parts of prefabricated steel sections, and the prefabricated steel sections are connected by welding. The bolt sleeve 7 is embedded in the pipe segment of the lining ring 1 of the communication channel portal, and the prefabricated steel section is connected to the lining ring 1 of the communication channel portal by high-strength bolts 8. The prefabricated steel section can also be connected by drilling holes on site and using high-strength expansion bolts.

[0067] Compared with cast-in-place reinforced concrete ring beam, the steel ring beam 1 is easy to install and remove, has a short processing cycle, and can be reused to save cost. An inner arc steel plate 5 is embedded in the inner arc surface of the tunnel segment for welding the steel sleeve 4 of the communication channel to realize the starting and receiving of the communication channel boring machine, and an outer arc steel plate 6 is embedded in the outer arc surface of the tunnel segment to bear part of the tensile stress on the outer side of the segment.

[0068] As a result, the structural rigidity of the connecting channel portal is enhanced, and the reinforced ring beam is composed of steel sections with a simple connection method, which reduces the installation and disassembly time. The reinforced ring beam can be reused to save construction costs. At the same time, the embedded inner arc steel plate can be welded to the steel sleeve to ensure the waterproof seal of the connecting channel tunnel boring machine at the start and end, and the embedded outer arc steel plate can enhance the rigidity of the connecting channel portal lining ring 1 segment and bear the tensile stress of the outer part of the segment.

[0069] The parts not described in detail in the present invention are all conventional technical means known to those skilled in the art.

[0070] The above content shows and describes the basic principle, main features and beneficial effects of the utility model. The above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A tunnel door reinforcement structure, characterized in that: It comprises a steel ring beam (2) for connecting to a tunnel portal lining structure, wherein the steel ring beam (2) comprises a plurality of steel profile components for fitting to the tunnel portal lining structure, wherein the steel profile components are connected to form a ring-shaped assembly for installation on the outer periphery of the tunnel portal.

2. The door reinforcement structure according to claim 1, characterized in that: The steel ring beam (2) is connected to the portal lining structure via embedded bolts or embedded bolt sleeves (7) provided on the portal lining structure.

3. The door reinforcement structure according to claim 1, characterized in that: The steel ring beam (2) is welded to a pre-buried steel plate provided on the portal lining structure.

4. The door reinforcement structure according to claim 1, characterized in that: The steel ring beam (2) is connected to the portal lining structure via expansion bolts or chemical bolts.

5. The portal reinforcement structure according to any one of claims 1 to 4, characterized in that: The steel ring beam (2) is fitted to the portal lining structure via a gasket.

6. The door reinforcement structure according to claim 5, characterized in that: The steel member comprises a transverse steel member and a vertical steel member. The side of the vertical steel member that fits the portal lining structure is in an arc shape. The two transverse steel members are connected between the two vertical steel members.

7. A tunnel lining structure, characterized in that: The portal reinforcement structure according to any one of claims 1 to 6 is connected.

8. The portal lining structure according to claim 7, characterized in that: A steel structure ring for connecting the steel sleeve (4) is arranged on the inner side of the portal lining structure, and a steel structure plate is arranged on the outer side, and a through hole corresponding to the steel sleeve (4) is arranged on the steel structure plate.

9. The portal lining structure according to claim 8, characterized in that: The steel structure circular ring is located within the range surrounded by the steel ring beam (2), and the coverage range of the steel structure plate is opposite to the inside and outside of the coverage range of the steel ring beam (2).

10. The portal lining structure according to claim 8 or 9, characterized in that: The portal lining structure is a connecting passage portal lining ring (1), the portal is a connecting passage portal (3), the connecting passage portal lining ring (1) comprises a plurality of tunnel segments, the steel structure ring comprises a plurality of sections of inner arc steel plates (5) respectively embedded in the inner side of each of the tunnel segments, and the steel structure plate comprises a plurality of sections of outer arc steel plates (6) respectively embedded in the outer side of each of the tunnel segments.

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