Mechanical curve station-crossing connection cavern section structure
By adopting the mechanical curved station-passing and tunnel section structure in subway projects, the problems of mechanical entrapment and high geological risks in traditional construction have been solved, the smooth passage of machinery through stations has been achieved, construction costs have been reduced, construction efficiency has been improved, and the construction schedule connection between stations and sections has been coordinated.
Patent Information
- Application Number
- CN202423081351.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-13
- Publication Date
- 2025-09-16
- Estimated Expiration
- 2034-12-13
AI Technical Summary
When connecting stations and section tunnels in subway projects, traditional mechanical construction methods can lead to problems such as machinery being stuck and shut down, limit mismatches, high construction risks, and increased construction costs. This is especially true in underground tunneling stations, where traditional entry methods increase geological risks and make equipment maintenance difficult.
A mechanical curve is used to connect the tunnel section structure, including the segment section, bare rock section, connecting tunnel and station side wall. An entry curve and a mechanical main engine are set up, and excavation is carried out through the mechanical main engine to ensure smooth passage of the machinery. Initial support and secondary lining are completed in advance in the connecting tunnel, and reinforced ring beams are set to ensure the mechanical boundaries and building boundaries.
It avoids the increase in surface area and geological risks in traditional methods, solves the construction difficulties caused by insufficient mechanical limits, reduces construction costs, improves construction efficiency and equipment maintenance convenience, coordinates the construction schedule of stations and sections, and ensures the smooth passage of the entire line.
Smart Images
Figure CN223344041U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of urban rail transit engineering design and construction, in particular to a mechanical curved station-passing connecting cavern cross-section structure. Background Art
[0002] Subway projects are typical linear municipal projects. Interval tunnels are mostly constructed mechanically. In order to ensure the continuity and efficiency of mechanical excavation, they have to frequently pass through underground excavation stations. They often face difficulties such as mismatched tunnel and station construction periods, disconnected work processes, and long-term machine suspension and waiting. Two extremes are often formed: First, when the machinery reaches the end of the station, the connecting tunnel has not been completed and cannot provide an access channel to the station, which will cause the machinery to be trapped and suspended, seriously delaying the subsequent excavation of the interval tunnel. If the suspension and waiting time is too long, mechanical failures may occur and be difficult to eliminate. Second, even if the connecting cavern at the end of the station has been completed, it will often face the difficulties of insufficient limits, insufficient length, or excessive limits and excessive length. The former usually leads to the mechanical cutter head being blocked, difficulty in turning, and difficulty in getting out of trouble. The latter is likely to increase engineering risks, increase construction costs, and reduce interval assembly rates. When the above two extreme situations are serious, they will affect the key nodes of the entire line, such as tunnel connection, power connection, water connection, joint debugging, and trial operation. In response to the above problems, there are two traditional solutions:
[0003] 1) The machinery uses a ground-based overpass method, with a separate machinery hoisting shaft set up at the station end, isolating the section and station into two mutually independent working areas. When the machinery reaches the station end, the machine is dismantled and hoisted out, then transferred to the next section on the ground and hoisted back in for excavation. This method requires multiple hoisting and disassembly of the main machine, which is not conducive to equipment care and maintenance and may cause permanent damage that is difficult to repair. The hoisting shaft has relatively high requirements for site space and layout, resulting in increased pre-requisite work such as land occupation, demolition, and green relocation. Especially for deeply buried underground excavated stations, setting up a vertical shaft at the end will face extremely high engineering investment and construction geological risks.
[0004] 2) The machine enters the station in a straight line. By increasing the station width so that its limit can completely envelop the interval limit, the machine can directly excavate along the center line of the line into the station. Although this can ensure the smooth entry of the machine into the station, it will significantly increase the excavation span of the underground station. According to calculations, it needs to be increased by at least 2.3m. The resulting increase in geological construction risks and construction costs is difficult to estimate and unacceptable.
[0005] To sum up, the key to whether the machine can pass through the station smoothly lies in eliminating the limit difference between the large-limit circular section and the small-limit single-arch straight-wall station. In view of the many disadvantages and shortcomings of the traditional station entry method, the utility model provides a mechanical curved station-passing connecting cavern cross-section structure. Utility Model Content
[0006] In response to the above technical problems, the utility model discloses a cross-sectional structure of a mechanical curved station connecting cavern, comprising a segment section, a bare rock section, a connecting cavern and a station side wall arranged in sequence from left to right, a track surface elevation being provided at the bottom end of the connecting cavern, a line centerline and an approach curve being provided in the connecting cavern, a mechanical main machine being provided in the connecting cavern, and excavation being performed by means of the mechanical main machine, the mechanical main machine comprising a front shield, a middle shield, a tail shield and a cutterhead, the connecting cavern comprising an initial support and a secondary lining arranged in sequence from the inside to the outside, a reinforcing ring beam being provided at one end of the secondary lining, the reinforcing ring beam being flush with and connected to the initial support, and a plurality of station center columns being provided on one side of the station side wall.
[0007] Furthermore, the approach curve is composed of two tangent reverse arcs, and the radius of the approach curve determines the minimum turning radius based on the diameter of the cutter head on the mechanical main unit, the length of the mechanical main unit and the caulking waterproof effect. The starting point of the approach curve coincides with the starting point of the center line of the line, and the end point of the approach curve is offset from the end point of the center line of the line.
[0008] Furthermore, the mechanical main unit drives the cutterhead to move along the station approach curve, and the trajectory of the cutterhead movement along the station approach curve is the equipment limit. The equipment limit is offset radially outward to reserve a safety margin and becomes the building limit. The initial position state of the mechanical main unit on the station approach curve is equipment limit state one, and the final position state of the mechanical main unit on the station approach curve is equipment limit state two. The initial position of the mechanical main unit when entering the connecting cavern from the bare rock section along the station approach curve is building limit state one, and the final position of the mechanical main unit when entering the station side wall from the connecting cavern along the station approach curve is building limit state two.
[0009] Furthermore, the building limit state one and the building limit state two are the inner contours of the secondary lining. The initial support and secondary lining in the connecting tunnel must be completed before the arrival of the main machine, and a guide platform is arranged on the invert arch of the secondary lining and the sliding track of the main machine is embedded in advance.
[0010] Furthermore, the main mechanical machine excavates between the segment interval and the bare rock interval and along the center line of the line, and the segment interval and the tail shield on the main mechanical machine assemble the segments. After the main mechanical machine enters the connecting cavern through the sliding track, it assembles the segments of the bare rock interval and molds the reinforced ring beam.
[0011] Compared with the existing technology, the present invention has the following advantages: (1) it overcomes the disadvantages of the separate well-passing station method, which requires additional preliminary work such as surface occupation, demolition, and green migration, and does not require increasing the width of the station, completely avoiding the disadvantages of increased geological risks and rising construction costs in large-span tunnel construction; (2) it solves the construction difficulties caused by insufficient limits and insufficient length of machinery in traditional connecting tunnels, such as the delay of tunnel excavation tasks in the subsequent section caused by the machinery being stuck and stopped for a long time, the interference of the station-passing operation with the remaining construction organization of the station after being freed, the damage caused by the long-term stagnation of the machinery to the equipment, and the daily maintenance costs, etc., avoiding the risk of small clearance construction in double-track sections caused by excessive limits and length of the connecting tunnel, reducing the assembly rate of the section pipe segments, and wasting the construction space of the section after entering the station; (3) it helps to plan and coordinate the connection of construction periods and processes between stations and sections in advance, avoid the window period of waiting for construction period due to the mutual constraints between stations and tunnels, and is also conducive to the overall control and coordination of key nodes such as tunnel connection, power connection, water connection, joint adjustment, and trial operation of the entire line. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Figure 1 This is a schematic diagram of the plan structure of the mechanical curved station connection chamber of the utility model.
[0013] Figure 2 This is a schematic diagram of the cross-sectional structure of the mechanical curved station connection cavern of the utility model.
[0014] Figure numbers: 1-machine main engine; 2-line centerline; 3-station entrance curve; 4-segment section; 5-bare rock section; 6-primary support; 7-secondary lining; 8-cutterhead; 9-equipment boundary; 10-building boundary; 11-reinforced ring beam; 12-station center column; 13-station side wall; 14-connecting cavern; 15-track surface elevation; 9-1-equipment boundary state 1; 9-2-equipment boundary state 2; 10-1-building boundary state 1; 10-2-building boundary state 2. DETAILED DESCRIPTION
[0015] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features therein can be combined with each other.
[0016] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like 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, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.
[0017] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.
[0018] Example: Figure 1 、 Figure 2As shown, a cross-sectional structure of a mechanical curve connecting tunnel through the station includes a segment section 4, a bare rock section 5, a connecting tunnel 14 and a station side wall 13 arranged in sequence from left to right. A track surface elevation 15 is provided at the bottom of the connecting tunnel 14. A line centerline 2 and an approach curve 3 are provided in the connecting tunnel 14. A mechanical host 1 is provided in the connecting tunnel 14. Excavation is carried out by the mechanical host 1. The mechanical host 1 adopts an inverted cone design with a large front and a small rear. The mechanical host 1 includes a front shield, a middle shield, a tail shield and a cutterhead 8. The length of the mechanical host 1 is 600mm for the initial support of the station center column 12. The diameter of the cutterhead 8 is the largest, and the diameter is 300mm for the initial support 6 approach curve. The length of each shield is 600mm. An active hinged connection method is adopted between the two sections. The connecting cavern 14 includes an initial support 6 and a secondary lining 7 arranged in sequence from the inside to the outside. A reinforcing ring beam 11 is provided at one end of the secondary lining 7. The reinforcing ring beam 11 is flush with and connected to the initial support 6. A plurality of station center columns 12 are provided on one side of the station side wall 13. The vertical distance from the lowest edge of the cutterhead 8 to the track surface elevation 15 is 0, and the equipment limit of the reinforcing ring beam 11 is 90 mm. Through the above scheme, this scheme overcomes the disadvantages of the separate well-passing station method that requires additional preliminary work such as surface occupation, demolition, and green relocation, and there is no need to increase the width of the station, completely avoiding the disadvantages of increased geological risks and rising construction costs in large-span tunnel construction.
[0019] The mechanical host 1 is excavated between the segment interval 4 and the bare rock interval 5 and along the line centerline 2. The segment interval 4 is assembled with the tail shield on the mechanical host 1. The bare rock interval 5 is temporarily not supported because the shield of the mechanical host 1 has not yet entered the connecting cavern 14. The shield is relied on to ensure the stability of the bare rock interval 5. The approach curve 3 is composed of two tangent reverse arcs. The radius of the approach curve 3 is determined by the diameter of the cutter head 8 on the mechanical host 1, the length of the mechanical host 1 and the caulking waterproof effect to determine the minimum turning radius. The minimum turning radius is 5000mm in the bare rock interval of the line centerline 2. The starting point of the approach curve 3 coincides with the starting point of the line centerline 2, and the end point of the approach curve 3 coincides with the end point of the line centerline 2. Offset, the offset distance is 900mm of the equipment limit, the mechanical host 1 drives the cutter head 8 to move along the station approach curve 3, and the trajectory of the cutter head 8 moving along the station approach curve 3 is the equipment limit 9, and the equipment limit 9 is offset radially outward with a reserved safety margin to become the building limit 10. The reserved safety margin is a comprehensive consideration of the posture deviation, axis displacement and body instability that the mechanical host 1 will face during the station approach, and the space reserved for mechanical posture correction and fine-tuning in motion is reserved. The reserved safety margin is 150mm of the track surface elevation. The initial position state of the mechanical host 1 on the station approach curve 3 is the equipment limit state 9-1, and the final position state of the mechanical host 1 on the station approach curve 3 is The equipment limit state 2 is 9-2. The initial position of the mechanical host 1 when entering the connecting cavern 14 from the bare rock section 5 along the station approach curve 3 is the building limit state 10-1. The final position of the mechanical host 1 when entering the station side wall 13 from the connecting cavern 14 along the station approach curve 3 is the building limit state 2 10-2. The building limit state 10-1 and the building limit state 2 10-2 jointly determine the cross-sectional structural space of the connecting cavern 14. The building limit state 10-1 and the building limit state 2 10-2 are the inner contours of the secondary lining 7. The arc wall and the inverted arch position of the building limit state 10-1 and the building limit state 2 10-2 are tangent to the inner contour of the secondary lining 7. The initial support 6 and secondary lining 7 in the connecting tunnel 14 need to be completed before the arrival of the main machine 1, and a guide platform is arranged on the invert arch of the secondary lining 7 and the sliding track of the main machine 1 is pre-buried. Through the above solution, the construction difficulties caused by insufficient limits and insufficient length of the machinery in the traditional connecting tunnel are solved, such as the delay of the tunnel excavation task in the continued section due to the long-term suspension of the machinery, the interference of the passing station operation after being freed from the jam, the damage to the equipment caused by the long-term stagnation of the machinery, and the daily maintenance costs. It also avoids the risks of small clear distance construction in the double-track section caused by the excessive limit and length of the connecting tunnel, reduces the assembly rate of the section pipe segments, and wastes the section building space after entering the station.
[0020] After the mechanical main unit 1 enters the connecting cavern 14 through the sliding track, it assembles the pipe segments of the bare rock section 5 and forms the reinforced ring beam 11. If after entering the station, the station center column 12 conflicts with the shield of the mechanical main unit 1, temporary column replacement measures are required to ensure that the mechanical main unit 1 can smoothly enter and pass the station until the second departure after the war. The above scheme helps to plan and coordinate the construction period connection and process connection between stations and sections in advance, avoid the window period of waiting for the construction period due to the mutual constraints of stations and tunnels, and is also conducive to the overall control and coordination of key nodes such as tunnel connection, power connection, water connection, joint debugging, and trial operation of the entire line.
[0021] Furthermore, it should be noted that the shapes and names of the parts and components of the specific embodiments described in this specification may vary. Any equivalent or simple variations based on the concepts, structures, features, and principles of this utility model are included within the scope of protection of this utility model. Persons skilled in the art of this utility model may make various modifications, additions, or substitutions to the described specific embodiments, and these modifications, as long as they do not deviate from the structure of this utility model or exceed the scope defined by these claims, shall fall within the scope of protection of this utility model.
Claims
1. A mechanical curved transit tunnel cross-section structure, characterized by: The invention comprises a segment section (4), a bare rock section (5), a connecting cavern (14) and a station side wall (13) arranged in sequence from left to right, wherein the bottom end of the connecting cavern (14) is provided with a track surface elevation (15), the connecting cavern (14) is provided with a line center line (2) and a station entrance curve (3), a mechanical main machine (1) is provided in the connecting cavern (14), and excavation is performed by the mechanical main machine (1), the mechanical main machine (1) comprises a front shield, a middle shield, a tail shield and a cutterhead (8), the connecting cavern (14) comprises an initial support (6) and a secondary lining (7) arranged in sequence from inside to outside, one end of each secondary lining (7) is provided with a reinforcing ring beam (11), the reinforcing ring beam (11) is flush with and connected to the initial support (6), and a plurality of station center columns (12) are provided on one side of the station side wall (13).
2. A mechanical curved transit tunnel cross-section structure according to claim 1, characterized in that: The approach curve (3) is composed of two tangent reverse circular arcs. The radius of the approach curve (3) is determined by the minimum turning radius according to the diameter of the cutter head (8) on the mechanical main unit (1), the length of the mechanical main unit (1) and the caulking waterproof effect. The starting point of the approach curve (3) coincides with the starting point of the line center line (2), and the end point of the approach curve (3) is offset from the end point of the line center line (2).
3. A mechanical curved transit tunnel cross-section structure according to claim 2, characterized in that: The mechanical main unit (1) drives the cutterhead (8) to move along the station entry curve (3), and the trajectory of the cutterhead (8) moving along the station entry curve (3) is the equipment limit (9), and the equipment limit (9) is offset radially outward to reserve a safety margin to become the building limit (10). The initial position state of the mechanical main unit (1) on the station entry curve (3) is the equipment limit state one (9-1), and the final position state of the mechanical main unit (1) on the station entry curve (3) is the equipment limit state two (9-2). The initial position of the mechanical main unit (1) when entering the connecting cavern (14) from the bare rock section (5) along the station entry curve (3) is the building limit state one (10-1), and the final position of the mechanical main unit (1) when entering the station side wall (13) from the connecting cavern (14) along the station entry curve (3) is the building limit state two (10-2).
4. A mechanical curved transit tunnel cross-section structure according to claim 3, characterized in that: The construction limit state 1 (10-1) and the construction limit state 2 (10-2) are the inner contours of the secondary lining (7). The initial support (6) and the secondary lining (7) in the connecting cavern (14) need to be completed before the arrival of the mechanical main unit (1), and a guide platform is arranged on the inverted arch of the secondary lining (7) and a sliding track of the mechanical main unit (1) is pre-buried.
5. A mechanical curved transit connection cavern cross-section structure according to claim 4, characterized in that: The mechanical main machine (1) is excavated between the segment section (4) and the bare rock section (5) and along the line centerline (2); the segment section (4) and the tail shield on the mechanical main machine (1) are assembled into segments; the mechanical main machine (1) enters the connecting cavern (14) via a sliding track, assembles the segments of the bare rock section (5) and molds a reinforcing ring beam (11).