Bridge and tunnel connecting structure for mountain railway steep slope

Abstract

The invention discloses a bridge and tunnel connecting structure for a mountain railway steep slope, which belongs to the technical field of mountain railway bridges and comprises a head end connecting unit, a middle section connecting unit and a tail end connecting unit. The head-end connecting unit is arranged on the side, facing a tunnel, of a bridge, the middle-section connecting units are sequentially arranged on the side, away from a bridge body, of the head-end connecting unit in the longitudinal direction, and the tail-end connecting unit is arranged on the side, away from the bridge body, of the head-end connecting unit. The head end connecting unit, the middle section connecting units and the tail end connecting unit are all arranged on a rock stratum, and the vertical heights are sequentially reduced. The invention provides a bridge and tunnel connecting structure for a mountain railway steep slope, which has stronger pertinence and adaptability to the mountain railway, can reduce the excavation workload of a mountain in construction, can simplify the construction building of the connecting structure, reduces the construction difficulty, reduces the engineering cost, and improves the construction efficiency. And the damage to the ecological environment can be reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of mountain railway bridges, and in particular relates to a bridge-tunnel connection structure for steep slopes of mountain railways. Background Art

[0002] Mountainous terrain in my country accounts for a large proportion of the country's land area. For mountainous railway terrain with high altitudes, due to the steep slopes around the peaks, tunnels are usually dug on the mountains at the junction of mountains and canyons. Accordingly, bridges need to be built in the canyons, and then this combination of bridges and tunnels is used to construct railway transportation arteries in mountainous areas.

[0003] In existing bridge-tunnel connection structures, if a connection between abutments and tunnels needs to be achieved, there are usually two connection structures.

[0004] One connection structure involves installing a non-standard simply supported beam on the side of the abutment facing away from the tunnel. Installing a non-standard simply supported beam typically requires excavating a portion of the steep slope at the bottom of the beam, followed by cast-in-place construction. However, cast-in-place construction on steep slopes is challenging due to the typically steep slopes. The erection of the support also requires foundation preparation, making the project costly.

[0005] Another connection structure involves installing a short roadbed between the abutment and the tunnel. This requires excavating the mountain along the slope. To provide stable support for the roadbed section, space must be excavated within the mountain to accommodate the short roadbed. Furthermore, on the side of the short roadbed facing the slope, a conical cone must be excavated to block the fill on both sides of the roadbed section. On steep slopes, the cones are set along the slope, forming high cones. This not only results in a large construction workload but also extensively damages the surrounding vegetation, resulting in high project costs, long construction periods, and significant impacts on the ecological environment. Summary of the Invention

[0006] In response to one or more of the above-mentioned defects or improvement needs of the prior art, the present invention provides a bridge-tunnel connection structure for steep slopes of mountain railways, which has strong pertinence and adaptability to mountain railways. It can not only reduce the workload of excavation of the mountain during construction, but also simplify the construction of the connection structure, reduce construction difficulty, reduce engineering costs, and reduce the amount of damage to the ecological environment, which has good ecological significance and economic benefits.

[0007] To achieve the above-mentioned object, the present invention provides a bridge-tunnel connection structure for steep slopes of mountain railways, comprising: A head end connection unit, the head end connection unit is arranged on the side of the bridge facing the tunnel, and the top end surface of the head end connection unit is aligned with the beam of the bridge facing the tunnel; At least one middle section connecting unit, each of the middle section connecting units is sequentially arranged in the longitudinal direction on a side of the head end connecting unit away from the beam body, and a top end surface of each of the middle section connecting units is flush with a top end surface of the head end connecting unit; a tail end connection unit, the tail end connection unit being arranged on a side away from the head end connection unit and facing away from the bridge, and the tail end connection unit being connected to a track surface in the tunnel; A head end connection unit, at least one middle section connection unit and a tail end connection unit are sequentially arranged in the longitudinal direction between the beam body and the tunnel. From the beam body to the tunnel, the head end connection unit, each middle section connection unit and the tail end connection unit are all arranged on the rock layer, and the vertical heights decrease sequentially. The head end connection unit and each of the middle section connection units are provided with a communicating hollow structure in the longitudinal direction to form a hollow channel in the head end connection unit and each of the middle section connection units for inspection and maintenance of the head end connection unit and each of the middle section connection units.

[0008] As a further preferred embodiment of the present invention, a cantilever extending toward the bridge is provided on the side of the head end connection unit facing the beam body, and an inspection channel is formed between the bottom of the cantilever and the beam body for forming a working space for detecting the side of the beam body facing the tunnel.

[0009] As a further preferred embodiment of the present invention, the bottom of the beam body and the bottom of the head end connection unit are arranged on a pedestal at the same vertical height, and the pedestal is set on a rock layer on a steep slope of the mountain.

[0010] As a further preferred embodiment of the present invention, a water retaining platform is provided on the side of the top end surface of the head end connecting unit facing the bridge, and the water retaining platform extends laterally to block the end of the head end connecting unit to prevent water from flowing out from the end of the head end connecting unit and continuously impacting the beam body.

[0011] As a further preferred embodiment of the present invention, the top structures of the head end connection unit, each of the middle section connection units and the tail end connection unit are the same as the top structure of the beam body of the bridge, so as to facilitate the deployment of ancillary facilities after docking.

[0012] As a further preferred embodiment of the present invention, the bottoms of the head end connection unit, each of the middle section connection units and the tail end connection unit are all provided with a bearing platform, and the bearing platforms are all arranged on the rock formation.

[0013] As a further preferred embodiment of the present invention, the longitudinal lengths of the middle section connecting units and the tail end connecting units are the same.

[0014] As a further preferred embodiment of the present invention, a front wall is provided on the side of the head end connection unit facing the beam body, a pad stone is provided on the top surface of the front wall, and the bottom of the beam body is provided on the pad stone.

[0015] As a further preferred embodiment of the present invention, a concrete filling layer is provided on the bottom end surface of the hollow structure.

[0016] As a further preferred embodiment of the present invention, the middle connecting unit includes a first connecting unit and a second connecting unit, the first connecting unit has a through hollow structure opened in the longitudinal direction, and the second connecting unit has a non-through hollow structure opened in the longitudinal direction.

[0017] In general, the above technical solutions conceived by the present invention have the following beneficial effects compared with the prior art: (1) The bridge-tunnel connection structure for steep slopes of mountain railways of the present invention comprises a head-end connection unit, a middle-section connection unit and a tail-end connection unit; the head-end connection unit is arranged on the side of the bridge facing the tunnel, and the head-end connection unit is aligned with the beam of the bridge facing the tunnel; the middle-section connection units are arranged in sequence along the longitudinal direction on the side of the head-end connection unit away from the beam, and the top surface of each middle-section connection unit is flush with the top surface of the head-end connection unit; the tail-end connection unit is arranged on the side away from the head-end connection unit away from the bridge, and the tail-end connection unit is connected to the track surface in the tunnel; the head-end connection unit, at least one middle-section connection unit and the tail-end connection unit are arranged in sequence along the longitudinal direction between the beam and the tunnel; the head-end connection unit, each middle-section connection unit and the tail-end connection unit are all arranged on the rock layer from the beam to the tunnel, and the vertical height decreases in sequence. This bridge-tunnel connection structure is highly targeted and adaptable to mountain railways. It can not only reduce the workload of mountain excavation during construction, but also simplify the construction of the connection structure, reduce construction difficulty, reduce project costs, and reduce damage to the ecological environment.

[0018] (2) The bridge-tunnel connection structure for steep slopes of mountain railways of the present invention is provided with a cantilever arranged in the direction of the bridge through the head-end connection unit, so as to form an inspection passage between the lower part of the cantilever and the beam of the bridge, so that workers can use the inspection passage to enter the beam and the head-end connection unit for accurate inspection and maintenance, thereby ensuring that the beam and the head-end connection unit are always kept in good condition.

[0019] (3) The bridge-tunnel connection structure for steep slopes of mountain railways of the present invention blocks the end of the head-end connection unit by providing a water retaining platform extending laterally in the direction of the bridge on the top surface of the head-end connection unit, thereby preventing water on the top surface of the head-end connection unit from flowing out from the end of the head-end connection unit and impacting the beam of the bridge close to the head-end connection unit, thereby enabling the beam of the bridge to always remain in a healthy state.

[0020] (4) The bridge-tunnel connection structure for steep slopes of mountain railways of the present invention has a simple design, convenient construction and stable structure. It sets a stepped connection structure between the bridge and the tunnel, the bottom of which is sequentially placed on the rock layer of the steep slope of the mountain, and arranges part of the stepped connection structure in the tunnel. Thus, while achieving a stable connection between the bridge and the tunnel, it can also optimize the large cone surface that needs to be arranged on the steep slope of the mountain in the conventional roadbed tunnel connection structure. Thus, it can not only reduce the amount of excavation on the steep slope of the mountain, but also reduce the amount of damage to the vegetation on the slope as much as possible, reduce the damage to the ecological environment around the slope, and then achieve the purpose of protecting the ecological environment. At the same time, by adopting each connection unit with the same horizontal and vertical dimensions, and combining the longitudinal dimensions of each connection unit according to the position of the rock layer of the bottom of the steep slope of the mountain, it can not only simplify the design process, making the bridge and tunnel connection structure on the steep slope of mountain railways more flexible in design and construction, but also improve the reuse rate of the template during the construction of the connection structure, and has good reference value and promotion prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a side view of a bridge-tunnel connection structure for steep slopes of mountain railways according to an embodiment of the present invention.

[0022] In all the drawings, the same reference numerals represent the same technical features, specifically: 1. Head connection unit; 2. First connection unit; 3. Vertical ladder; 4. Cantilever; 5. Cap; 6. Second connection unit; 7. Beam; 8. Steep slope of the mountain; 9. Tail connection unit; 10. Pad stone; 11. Guardrail; 12. Maintenance passage; 13. Hollow structure; 14. Front wall; 15. Concrete filling layer; 16. Steps. DETAILED DESCRIPTION

[0023] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only intended to illustrate the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

[0024] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0025] 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 the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0026] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0027] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0028] Example: See also Figure 1The bridge-tunnel connection structure for steep slopes of mountain railways in the preferred embodiment of the present invention has strong pertinence and adaptability to mountain railways. It can not only reduce the workload of excavating the mountain during construction, but also simplify the construction of the connection structure, reduce construction difficulty, reduce engineering costs, and reduce the amount of damage to the ecological environment, which has good ecological significance and economic benefits.

[0029] Specifically, if Figure 1 As shown in , in a preferred embodiment of the present application, the bridge-tunnel connection structure for steep slopes of mountain railways is arranged on the hillside between the bridge and the tunnel, and the bridge-tunnel connection structure includes a head end connection unit 1, at least one middle section connection unit and a tail end connection unit 9.

[0030] Among them, the head end connection unit 1 is arranged on the side of the bridge facing the tunnel, and the top end surface of the head end connection unit 1 is aligned with the beam body 7 of the bridge facing the tunnel, so as to facilitate the connection between the bridge-tunnel connection structure and the bridge, thereby providing a support foundation for the bridge-tunnel connection.

[0031] Furthermore, the middle section connection units are arranged in sequence along the longitudinal direction on the side of the head end connection unit 1 away from the beam body 7, and each middle section connection unit is flush with the top end surface of the head end connection unit 1. At the same time, the tail end connection unit 9 is arranged on the side away from the head end unit away from the bridge, and the tail end connection unit 9 is connected to the tunnel track surface, and then the head end connection unit 1, the middle section connection unit and the tail end connection unit 9 are connected in sequence along the longitudinal direction, and then a support platform with a continuous and flush top end surface is formed between the beam body 7 and the tunnel, providing a continuous and reliable installation foundation for track laying.

[0032] Furthermore, a head end connection unit 1, at least one middle section connection unit, and a tail end connection unit 9 are sequentially arranged longitudinally between the beam body 7 and the tunnel. From the beam body 7 to the tunnel, the head end connection unit 1, each middle section connection unit, and the tail end connection unit 9 are all arranged on the rock layer. The head end connection unit 1, each middle section connection unit, and the tail end connection unit 9 have their top surfaces flush from the beam body 7 side to the tunnel side, and the height of the bottom end surface of each connection unit increases sequentially, that is, the vertical height of each connection unit decreases sequentially, to ensure that each connection unit can be placed on the rock layer. At the same time, because the connection structure is arranged on a hillside, the gradually rising slope structure from the bridge to the tunnel at the hillside location corresponds to the step-by-step decreasing vertical bottom end surface of the connection section from the bridge to the tunnel. This reduces the construction workload of the connection structure while minimizing the amount of excavation on the steep slope 8 of the mountain.

[0033] Furthermore, a connected hollow structure 13 is opened in the longitudinal direction in the head-end connection unit 1 and the middle-section connection unit to form a hollow channel in the head-end connection unit 1 and each middle-section connection unit. This hollow channel can not only realize the inspection and maintenance of the head-end connection unit and each middle-section connection unit structure through this hollow channel during actual use, thereby ensuring the safety and stability of the bridge-tunnel connection structure, but also reduce the structural deadweight of the connection unit, and reduce the material usage of the connection unit and the production and preparation cost of the connection unit.

[0034] It is worth noting that in the preferred embodiment of the present application, the extending direction of the tunnel and the bridge in the horizontal plane is the longitudinal direction, the direction perpendicular to the longitudinal direction in the horizontal plane is the transverse direction, and the direction perpendicular or vertical to the horizontal plane is the vertical direction.

[0035] Furthermore, in a preferred embodiment of the present application, a cantilever 4 extending toward the bridge is provided on the side of the head end connection unit 1 facing the beam body 7. Preferably, the lateral width of the cantilever 4 is the same as the width of the beam body of the bridge, so as to form an inspection passage 12 between the head end connection unit 1 and the beam body 7 of the bridge closest to the tunnel, so that the staff can enter the beam body 7 and the head end connection unit 1 with the help of the inspection passage 12 for accurate inspection and maintenance, thereby ensuring that the beam body 7 and the head end connection unit 1 are always in good condition, providing reliable protection for the safe passage of vehicles.

[0036] Furthermore, in a preferred embodiment of the present application, a front wall 14 is provided at the bottom of the head end connection unit 1, and the front wall 14 is arranged on the base 5. At the same time, a pad stone 10 is provided on the top of the front wall 14. That is, the front wall 14 and the bottom end of the head end connection unit 1 are arranged on the base 5 at the same height.

[0037] Furthermore, in a preferred embodiment of the present application, a water retaining platform is provided on the side of the top end surface of the head end connection unit 1 facing the bridge. Preferably, the water retaining platform extends laterally to block the end of the head end connection unit 1, so as to prevent water on the top end surface of the head end connection unit 1 from flowing out from the end of the head end connection unit 1 and then impacting the beam body 7 of the bridge close to the head end connection unit 1, thereby enabling the beam body 7 of the bridge to always maintain a healthy state.

[0038] In more detail, in a preferred embodiment of the present application, the top structure of the head end connection unit 1, the middle section connection unit and the tail end connection unit 9 and / or the top structure of the head end connection unit 1 is the same as the top structure of the bridge beam, so that after the bridge-tunnel connection structure realizes the connection between the bridge and the tunnel, the ancillary facilities can be arranged uniformly and conveniently with the help of the top structure of the head end connection unit 1, the middle section connection unit and the tail end connection unit 9 being the same as the top structure of the beam, which can not only provide stable equipment support for the operation of the bridge and tunnel, but also facilitate construction.

[0039] Preferably, the top structure of the head end connection unit 1, the middle section connection unit and the tail end connection unit 9 is the same as the top structure of the beam body. At the same time, the top structure of the head end connection unit 1, the middle section connection unit and the tail end connection unit 9 corresponds to the structure of the ancillary facilities deployed in the tunnel, further improving the convenience of the arrangement of the ancillary facilities.

[0040] Furthermore, in a preferred embodiment of the present application, longitudinally extending cantilevers are symmetrically provided on both sides of the head connection unit 1, the middle connection unit, and the tail connection unit 9 to facilitate the arrangement of ancillary facilities. Preferably, the cantilevers provided on the head connection unit 1, the middle connection unit, and the tail connection unit 9 correspond to the beam structure of the bridge.

[0041] Further preferably, in the preferred embodiment of the present application, a cap 5 is provided at the bottom of the connection unit to provide stable and reliable support for the connection unit. Preferably, the cap 5 is arranged on the rock layer of the steep slope 8 of the mountain, further improving the stability of the connection unit.

[0042] More specifically, in a preferred embodiment of the present application, the longitudinal lengths of the sections within each connecting unit are identical. This not only simplifies the design of the connecting structure but also facilitates construction, significantly improving the design and construction convenience of the connecting structure. Preferably, the longitudinal dimension of the head connecting unit 1 is 5.5 meters, and the longitudinal dimensions of the middle and tail connecting units 9 are also 5.5 meters. Furthermore, preferably, the transverse dimensions of each connecting unit are identical.

[0043] Furthermore, in a specific preferred embodiment of the present application, the head end connection unit 1, the middle section connection unit, and the tail end connection unit 9 are arranged in sequence along the direction from the bridge to the tunnel. The vertical heights of the head end connection unit 1, the middle section connection unit, and the tail end connection unit 9 decrease in sequence along the direction from the bridge to the tunnel, so that the bases 5 of the head end connection unit 1, the middle section connection unit, and the tail end connection unit 9 all present a stepped shape from the tunnel side to the bridge side.

[0044] Further preferably, in the preferred embodiment of the present application, the specific longitudinal heights of the head end connection unit 1, the middle section connection unit, and the tail end connection unit 9 are determined according to the position of the rock layer on the steep slope 8 of the mountain, that is, ensuring that the top surfaces of the head end connection unit 1, the middle section connection unit, and the tail end connection unit 9 are flush with the bridge and the tunnel respectively, and at the same time, the longitudinal bottom pedestals 5 of the head end connection unit 1, the middle section connection unit, and the tail end connection unit 9 are all arranged on the rock layer on the steep slope 8 of the mountain, thereby ensuring the stability of the entire connection section structure while reducing the size of each connection unit, which not only reduces the excavation of the steep slope 8 of the mountain, but also achieves lightweight connection structure, facilitates design and construction and reduces damage to vegetation.

[0045] In more detail, in a preferred embodiment of the present application, a hollow structure 13 extending in the longitudinal direction is provided in the corresponding maintenance passage 12 in the head end connection unit 1. Correspondingly, a hollow structure 13 is provided in each of the middle section connection units, and the hollow structures 13 of the head end connection unit 1 and each of the middle section connection units are connected in sequence, thereby forming a stable hollow passage for maintenance and inspection in the entire bridge-tunnel connection structure. Preferably, the tops of the hollow structures 13 of the head end connection unit 1 and each of the middle section connection units are at the same vertical height, but the bottom height of each of the above-mentioned hollow structures 13 gradually increases as the mountain extends. Further preferably, a concrete filling layer 15 is provided on the bottom end surface of each hollow structure 13, and the slope of the top end surface of the concrete filling layer 15 is 2% to facilitate drainage in the hollow structure 13.

[0046] Further preferably, in the preferred embodiment of the present application, steps 16 are provided near the ends of the concrete filling layers 15 in the two adjacent hollow structures 13 to facilitate the passage of personnel in each hollow structure 13, and between the two adjacent connection units with a large height difference, the step 16 structure can also block the soil behind, further improving the completeness and stability of the bridge-tunnel connection structure.

[0047] More specifically, in a preferred embodiment of the present application, the hollow structure 13 of the head-end connecting unit 1 longitudinally penetrates both end surfaces of the respective units, while the tail-end connecting unit 9 is a solid structure. Preferably, the middle section connecting unit includes a second connecting unit 6, in which a non-penetrating hollow structure 13 is longitudinally opened, i.e., a back wall is vertically provided at the end of the second connecting unit 6 facing away from the beam body 7. In actual use, the second connecting unit 6 is directly disposed between the head-end connecting unit 1 and the tail-end connecting unit 9, i.e., only the second connecting unit exists between the head-end connecting unit 1 and the tail-end connecting unit 9, so that the hollow structures 13 in the head-end connecting unit 1 and the second connecting unit 6 can form a hollow channel closed at the tail end.

[0048] Furthermore, in another preferred embodiment of the present application, the middle section connection unit also includes at least one first connection unit 2, and a hollow structure 13 is provided in the first connection unit 2 along the longitudinal direction. Preferably, the number of the first connection units 2 is determined according to the geological conditions of the hillside rock layer and the line data. Preferably, each first connection unit 2 is arranged in sequence on the side of the head end connection unit 1 away from the beam body 7, and the hollow structure 13 in each first connection unit 2 is connected to the hollow structure 13 in the head end connection unit 1; a second connection unit 6 is arranged between the last first connection unit 2 and the tail end connection unit 9, and the open end of the hollow structure 13 of the second connection unit 6 is connected to the hollow structure 13 on the last first connection unit 2, thereby forming a continuous hollow channel inside the bridge-tunnel connection structure.

[0049] Further preferably, in the preferred embodiment of the present application, the hollow structure 13 in the head end connection unit 1 is connected to the inspection passage 12, and a guardrail 11 is provided on the side of the hollow structure 13 corresponding to the inspection passage 12. Preferably, since the top surface height of the front wall 14 is higher than the bottom surface height of the hollow structure 13, a vertical ladder 3 is provided on the side of the front wall 14 facing the hollow structure 13 to facilitate workers to descend into the hollow passage.

[0050] The bridge-tunnel connection structure for steep slopes on mountain railways in the present invention has a simple design, convenient construction, and a stable structure. By providing a stepped connection structure between the bridge and the tunnel, with its bottom portion sequentially positioned on the rock strata of the steep mountain slope 8, and by arranging a portion of the stepped connection structure within the tunnel, while achieving a stable connection between the bridge and the tunnel, it also optimizes the large conical surface required for conventional roadbed-tunnel connection structures to be arranged on the steep mountain slope 8. This not only reduces the amount of excavation on the steep mountain slope 8, but also minimizes damage to vegetation on the slope and the surrounding ecological environment, thereby achieving the goal of protecting the ecological environment. Furthermore, by employing connection units having identical transverse and longitudinal dimensions, and combining a method in which the longitudinal dimensions of each connection unit are determined based on the position of the rock strata at the bottom of the steep mountain slope 8, the design process is simplified, making the design and construction of the bridge-tunnel connection structure on steep slopes on mountain railways more flexible, and the reuse rate of templates during the construction of the connection structure is significantly improved, thus having good reference value and promotion prospects.

[0051] It can also reduce the amount of damage to the ecological environment. Those skilled in the art can easily understand that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A bridge-tunnel connection structure for steep slopes of mountain railways, characterized in that: include: A head end connection unit, the head end connection unit is arranged on the side of the bridge facing the tunnel, and the top end surface of the head end connection unit is aligned with the beam of the bridge facing the tunnel; At least one middle section connecting unit, each of the middle section connecting units is sequentially arranged in the longitudinal direction on a side of the head end connecting unit away from the beam body, and a top end surface of each of the middle section connecting units is flush with a top end surface of the head end connecting unit; a tail end connection unit, the tail end connection unit being arranged on a side away from the head end connection unit and facing away from the bridge, and the tail end connection unit being connected to a track surface in the tunnel; A head end connection unit, at least one middle section connection unit and a tail end connection unit are sequentially arranged in the longitudinal direction between the beam body and the tunnel. From the beam body to the tunnel, the head end connection unit, each middle section connection unit and the tail end connection unit are all arranged on the rock layer, and the vertical heights decrease sequentially. The head end connection unit and each of the middle section connection units are provided with a communicating hollow structure in the longitudinal direction to form a hollow channel in the head end connection unit and each of the middle section connection units for inspection and maintenance of the head end connection unit and each of the middle section connection units.

2. The bridge-tunnel connection structure for steep slopes of mountain railways according to claim 1, wherein: A cantilever extending toward the bridge is provided on the side of the head end connection unit facing the beam body, and an inspection channel is formed between the lower portion of the cantilever and the beam body for forming a working space for detecting the side of the beam body facing the tunnel.

3. The bridge-tunnel connection structure for steep slopes of mountain railways according to claim 1, wherein: The bottom of the beam body and the bottom of the head end connection unit are arranged on a pedestal at the same vertical height, and the pedestal is set on a rock layer on a steep slope of a mountain.

4. The bridge-tunnel connection structure for steep slopes of mountain railways according to claim 1, wherein: A water retaining platform is provided on the side of the top end surface of the head end connection unit facing the bridge. The water retaining platform extends laterally to block the end of the head end connection unit to prevent water from flowing out from the end of the head end connection unit and continuously impacting the beam body.

5. The bridge-tunnel connection structure for steep slopes of mountain railways according to any one of claims 1 to 4, wherein: The top structures of the head end connection unit, each of the middle section connection units and the tail end connection unit are the same as the top structure of the beam body of the bridge, which is used to facilitate the deployment of auxiliary facilities after docking.

6. The bridge-tunnel connection structure for steep slopes of mountain railways according to claim 5, wherein: The bottoms of the head end connection unit, each of the middle section connection units and the tail end connection unit are all provided with a bearing platform, and the bearing platforms are all arranged on the rock layer.

7. The bridge-tunnel connection structure for steep slopes of mountain railways according to claim 5, wherein: The longitudinal lengths of the middle section connecting units and the tail end connecting units are the same.

8. The bridge-tunnel connection structure for steep slopes of mountain railways according to claim 5, wherein: A front wall is provided on the side of the head end connection unit facing the beam body, a pad stone is provided on the top end surface of the front wall, and the bottom of the beam body is provided on the pad stone.

9. The bridge-tunnel connection structure for steep slopes of mountain railways according to any one of claims 1 to 4, wherein: A concrete filling layer is provided on the bottom end surface of the hollow structure.

10. The bridge-tunnel connection structure for steep slopes of mountain railways according to claim 9, wherein: The middle connecting unit includes a first connecting unit and a second connecting unit. The first connecting unit has a through hollow structure along the longitudinal direction, and the second connecting unit has a non-through hollow structure along the longitudinal direction.

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