Rail transit multi-line common corridor type combined building structure and construction method

Abstract

The invention discloses a rail transit multi-line common corridor type combined construction structure and a construction method, and relates to the field of rail transit station engineering, the rail transit multi-line common corridor type combined construction structure comprises an elevated station, an underground station is arranged at the bottom of the elevated station, elevated interval bridges are connected to the two ends of the elevated station, and underground shield tunnels are arranged at the two ends of the bottom of the underground station. The elevated station platform is in a side type, the underground station platform is in an island type, the overall scale of the station can be reduced, good economical efficiency is achieved, under the condition that the using function of the station is not affected, the problem that the foundation structure of the elevated station and the elevated interval bridge conflicts with the underground station and the underground shield tunnel structure is solved, and meanwhile the service life of the elevated station and the elevated interval bridge is prolonged. The influence of later construction of elevated stations and elevated section bridges in a rail transit control protection area on existing lines is avoided, the construction time of the whole life cycle is effectively shortened, and the comprehensive utilization rate of land space is increased.

Description

Technical Field

[0001] The present invention relates to the field of rail transit station engineering, and in particular to a rail transit multi-line common corridor combined construction structure and a construction method. Background Art

[0002] With the rapid development of rail transit construction in my country, medium and low-capacity rail transit has been widely used due to its advantages of strong passenger flow adaptability, economic applicability, short construction period, and flexibility and diversity. Medium and low-capacity rail transit is usually laid on elevated platforms. It is widely used in domestic rail transit projects due to its high space utilization, small occupation of the green belt in the middle of the road, small impact on road traffic, and convenient construction.

[0003] At present, on the one hand, due to limited urban space, elevated rail transit lines and underground lines often need to be laid in the same corridor. When medium and low-capacity rail transit is laid via elevated lines, the station and section bridge infrastructure (caps, pile foundations) of the elevated line conflict with the subway station and section tunnel. If the elevated station or underground station adopts plane avoidance, the station's use function will be greatly weakened and the economic efficiency will be poor.

[0004] On the other hand, rail transit stations and sections usually have control protection zones, which restrict or prohibit development and construction activities within a certain range, resulting in low land utilization. The co-construction structure of elevated and underground lines reduces the impact of later line construction on existing lines, reduces the relevant approvals for construction in subway protection zones, effectively shortens the construction period, and enhances the comprehensive utilization of land space.

[0005] Currently, no effective solution has been proposed for the problems in the related technologies. Summary of the invention

[0006] In view of the problems in the related technology, the present invention proposes a rail transit multi-line common corridor joint construction structure and construction method to overcome the above-mentioned technical problems existing in the existing related technology.

[0007] To this end, the specific technical solution adopted by the present invention is as follows: According to one aspect of the present invention, a rail transit multi-line co-corridor structure is provided, including an elevated station, an underground station is arranged at the bottom of the elevated station, elevated section bridges are connected at both ends of the elevated station, and underground shield tunnels are arranged at both ends of the bottom of the underground station.

[0008] Furthermore, elevated station platforms are arranged on both sides of the elevated station, a plurality of elevated station piers are arranged at the bottom of the elevated station, and the bottoms of the elevated station piers penetrate the ground and are connected to the top of the underground station.

[0009] Furthermore, the top of the underground station is provided with a subway station top longitudinal beam matched with the elevated station pier, and the bottom of the subway station top longitudinal beam is connected to the underground station frame column.

[0010] Furthermore, small force-transmitting armpit angles are arranged between the bottom sides of the top longitudinal beam of the subway station and the frame columns of the underground station.

[0011] Furthermore, an underground station platform is arranged at the inner bottom of the underground station, a subway station bottom longitudinal beam is arranged at the inner bottom of the underground station platform, and force transmission armpit angles are arranged between both sides of the subway station bottom longitudinal beam and the inner bottom of the underground station.

[0012] Furthermore, a number of underground station pedestals are arranged at the bottom of the underground station, the bottoms of the underground station frame columns penetrate the underground station platform and the tops of the bottom longitudinal beams of the subway station and are connected to the underground station pedestals, and a number of station pile foundations are arranged at the bottom of the underground station pedestals.

[0013] Furthermore, micro-expansive concrete is provided on both sides of the top of the underground station pedestal, and a section bridge bearing is provided at the bottom of the elevated section bridge. The bottom of the section bridge bearing and one side of the top of the elevated station pier are connected through an end column corbel.

[0014] Furthermore, an underground station end wall is arranged at the end of the underground station, an underground station end reinforcement is arranged outside the underground station end wall, an elevated section bridge pier is arranged at the bottom of one end of the elevated section bridge, and a plurality of section bridge pile foundations are arranged at the bottom of the elevated section bridge pier.

[0015] Furthermore, the bridge piers in the elevated section are single-column T-shaped piers.

[0016] According to another aspect of the present invention, a construction method for a rail transit multi-line shared corridor type combined structure is also provided, and the construction method for a rail transit multi-line shared corridor type combined structure comprises the following steps: S1. Construct the underground station foundation pit retaining structure and station pile foundation; S2. Construct micro-expansion concrete between underground station pedestals, bottom slab and underground station pedestals, part of the side walls, bottom slab longitudinal beams and load-transmitting armpits; S3. Construction of frame columns, middle plates, middle longitudinal beams, top plates, top longitudinal beams and small force-transmitting armpit angles for underground stations; S4, construct piers for elevated stations and backfill for underground stations; S5. Construct elevated station structure and end column brackets; S6. Construction of secondary structures of platform slabs of underground stations and elevated stations, and reinforcement of underground station ends on both sides of underground stations; S7. Construct pile foundation caps for elevated bridges on both sides of the station; S8: Construction of underground shield tunnels on both sides of the underground station; S9, construct bridge piers in elevated sections; S10. The construction of the bridge supports on both sides of the elevated section and the elevated section beam co-corridor structure has been completed.

[0017] The beneficial effects of the present invention are: 1. In the present invention, the elevated station platform adopts the side type, and the underground station platform adopts the island type, which can reduce the overall scale of the station and has good economy. Without affecting the use function of the station, it solves the conflict problem between the foundation structure (capping platform, pile foundation) of the elevated station and the elevated section bridge and the underground station and underground shield tunnel structure. At the same time, it avoids the impact of the later construction of elevated stations and elevated section bridges in the rail transit control and protection zone on the existing line, effectively reduces the construction time of the whole life cycle, and enhances the comprehensive utilization rate of land space.

[0018] 2. The spacing between the elevated station piers and the underground station frame columns of the present invention is consistent, and the column position eccentricity is strictly controlled, which avoids the stress concentration problem caused by the inconsistency between different structures and improves the stability and safety of the structure. Both the elevated station and the underground station use steel concrete columns filled with self-compacting concrete, and the size of the underground station frame columns is not less than that of the elevated station piers, ensuring the reliability of vertical force transmission.

[0019] 3. The top longitudinal beam of the subway station of the present invention is protruded outwardly to serve as a small pedestal for the pier column of the elevated station, and a small force transmission armpit angle is set at the junction of the top longitudinal beam of the subway station and the frame column of the underground station, which ensures the reliability of vertical force transmission and improves the convenience and quality of construction. The bottom longitudinal beam of the subway station is turned upside down to avoid excessive density of steel bars, thereby reducing the complexity of steel bar construction and enhancing the construction quality of the structure.

[0020] 4. The frame columns of the underground station of the present invention are aligned with the center of the station pile foundation. The diameter and length of the station pile foundation are determined according to the bearing capacity calculation. At the same time, the pile group foundation and micro-expansive concrete backfill are adopted to ensure the vertical force transmission capacity of the underground station pedestal and the station pile foundation, and improve the bearing capacity and stability of the overall foundation. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 This is a three-dimensional diagram of a rail transit multi-line shared corridor joint construction structure according to an embodiment of the present invention; Figure 2 This is an elevation view of a rail transit multi-line shared corridor structure according to an embodiment of the present invention; Figure 3 It is a cross-sectional view of a co-construction of an elevated station and an underground station in a rail transit multi-line co-corridor co-construction structure according to an embodiment of the present invention; Figure 4 is a layout diagram of station pile foundations in a rail transit multi-line shared corridor structure according to an embodiment of the present invention; Figure 5 It is a cross-sectional view of the positional relationship between the lower structure of the intermediate bridge and the underground shield tunnel in a rail transit multi-line common corridor combined construction structure according to an embodiment of the present invention; Figure 6 It is a flow chart of a construction method of a rail transit multi-line shared corridor structure according to an embodiment of the present invention.

[0023] In the figure: 1. Elevated station; 2. Underground station; 3. Elevated section bridge; 4. Underground shield tunnel; 5. Elevated station platform; 6. Elevated station pier; 7. Subway station top longitudinal beam; 8. Underground station frame column; 9. Small force transmission armpit; 10. Underground station platform; 11. Subway station bottom longitudinal beam; 12. Force transmission armpit; 13. Underground station pedestal; 14. Station pile foundation; 15. Micro-expansive concrete; 16. Section bridge bearing; 17. End column corbel; 18. Underground station end wall; 19. Underground station end reinforcement; 20. Elevated section bridge pier; 21. Section bridge pile foundation. DETAILED DESCRIPTION

[0024] To further illustrate each embodiment, the present invention provides drawings, which are part of the disclosure of the present invention and are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, ordinary technicians in the field should be able to understand other possible implementations and advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0025] According to an embodiment of the present invention, a rail transit multi-line shared corridor joint construction structure and a construction method are provided.

[0026] The present invention is further described with reference to the accompanying drawings and specific embodiments. Figure 1-Figure 5 As shown, the rail transit multi-line common corridor combined construction structure according to an embodiment of the present invention includes an elevated station 1, an underground station 2 is arranged at the bottom of the elevated station 1, both ends of the elevated station 1 are connected with elevated section bridges 3, and underground shield tunnels 4 are arranged at both ends of the bottom of the underground station 2.

[0027] It should be explained that the overall engineering planning of the present invention is: construction of underground station 2 - construction of elevated station 1 - reinforcement of both ends of underground station 2 - structural construction of elevated section bridges 3 on both sides - construction of underground shield tunnel 4 .

[0028] It needs to be explained that the span of the connecting span of the elevated section bridge 3 to the elevated station 1 should be arranged as small as possible to reduce the impact of the section bridge load on the station structure. In addition, it is necessary to meet the space requirements for the starting and receiving of the shield machine of the underground shield tunnel 4, such as turning, steering, and translation.

[0029] It should be explained that the platform of elevated station 1 adopts a side platform to avoid the problem of setting horns at both ends of island stations, and the force transmission path of the vehicle load structure is reasonable and the internal force is evenly distributed. The underground station platform 10 adopts an island platform to avoid the risk of parallel operation with a small clearance in the shield section, and can avoid the pile foundation of the elevated section bridge 3 within the allowable curve radius of the line, while reducing the scale of the underground station and having high economy. Elevated station 1 is a single-column steel-concrete composite frame structure system with low requirements for road conditions, and underground station 2 is a single-column double-span reinforced concrete frame structure system, which reduces the scale of the underground station.

[0030] Preferably, elevated station platforms 5 are provided on both sides of the elevated station 1 , and a plurality of elevated station piers 6 are provided at the bottom of the elevated station 1 , and the bottoms of the elevated station piers 6 penetrate the ground and are connected to the top of the underground station 2 .

[0031] Preferably, the top of the underground station 2 is provided with a subway station top longitudinal beam 7 that matches with the elevated station pier 6, and the bottom of the subway station top longitudinal beam 7 is connected to the underground station frame column 8.

[0032] Preferably, small force-transmitting armpit angles 9 are provided between the bottom sides of the top longitudinal beam 7 of the subway station and the frame columns 8 of the underground station.

[0033] Preferably, an underground station platform 10 is provided at the inner bottom of the underground station 2 , a subway station bottom longitudinal beam 11 is provided at the inner bottom of the underground station platform 10 , and force transmission armpit angles 12 are provided between both sides of the subway station bottom longitudinal beam 11 and the inner bottom of the underground station 2 .

[0034] Preferably, a plurality of underground station pedestals 13 are provided at the bottom of the underground station 2, the bottom of the underground station frame column 8 passes through the underground station platform 10 and the top of the subway station bottom longitudinal beam 11 and is connected to the underground station pedestal 13, and a plurality of station pile foundations 14 are provided at the bottom of the underground station pedestal 13.

[0035] Preferably, micro-expansive concrete 15 is provided on both sides of the top of the underground station pedestal 13, and an interval bridge bearing 16 is provided at the bottom of the elevated interval bridge 3, and the bottom of the interval bridge bearing 16 is connected to one side of the top of the elevated station pier 6 through an end column corbel 17.

[0036] Preferably, an underground station end wall 18 is provided at the end of the underground station 2, an underground station end reinforcement 19 is provided outside the underground station end wall 18, an elevated section bridge pier 20 is provided at the bottom of one end of the elevated section bridge 3, and a plurality of section bridge pile foundations 21 are provided at the bottom of the elevated section bridge pier 20.

[0037] Preferably, the elevated section bridge pier 20 is a single-column T-shaped pier.

[0038] According to another embodiment of the present invention, Figure 6 As shown, a construction method for a rail transit multi-line shared corridor type combined structure is also provided, and the construction method for a rail transit multi-line shared corridor type combined structure comprises the following steps: S1. Construction of underground station foundation pit retaining structure and station pile foundation 14; S2, construct the underground station pedestal 13 with micro-expansion concrete 15, the bottom plate and underground station pedestal 13, part of the side wall, the bottom plate longitudinal beam and the force transmission armpit 12; S3, construct the frame columns 8, middle plates, middle longitudinal beams, top plates, top longitudinal beams and small force-transmitting armpit angles 9 of the underground station; S4, construct elevated station pier 6 and backfill the underground station; It should be explained that the elevated station pier 6 and the underground station frame column 8 are both steel concrete columns with self-compacting concrete poured inside. The longitudinal spacing between the elevated station pier 6 and the underground station frame column 8 is consistent, generally 9~12m, and the eccentricity of the upper and lower columns is less than one-sixth of the short side of the underground station frame column 8, and the eccentricity shall not exceed 50mm. At the same time, the lateral size of the underground station frame column 8 is not less than that of the elevated station pier 6 to ensure reliable force transmission. The top longitudinal beam 7 of the subway station adopts an outward convex type, which is 200~300mm higher than the top plate and serves as a small pedestal for the elevated station pier 6. A small force transmission armpit angle 9 with a size of 200~300mm is set at the junction of the underground station frame column 8 and the subway station top longitudinal beam 7 to ensure reliable vertical force transmission.

[0039] S5, construct elevated station structure and end column bracket 17; S6, construct the secondary structure of the platform slabs of the underground station and the elevated station 1, and reinforce the underground station ends on both sides of the underground station 19; It needs to be explained that the subway station bottom longitudinal beam 11 is turned up to avoid too dense steel bars in the subway station bottom longitudinal beam 11 and the underground station pedestal 13. The connection between the subway station bottom longitudinal beam 11 and the underground station pedestal 13 is provided with a force transmission armpit angle 12 with a size of 600x300. The station pile foundation 14 under the underground station pedestal 13 is changed to a multi-pile arrangement, in which the centroid of the pile group is required to be aligned with the center of the frame column to ensure reliable vertical force transmission. The diameter of the station pile foundation 14 is 0.8m~1.2m, and the pile length is determined according to calculation.

[0040] S7, construct three pile foundation caps for elevated section bridges on both sides of the station; It should be explained that the station pile foundation 14 adopts a pile group foundation and a plum blossom pile arrangement, on which an underground station cap 13 is arranged, and the station pile foundation 14 extends into the underground station cap 13, and casts the base plates of the underground station cap 13 and the underground station 2. The elevated station 1 can be prefabricated and assembled, shortening the construction period and having little impact on ground traffic. The base plates 13 and the fertilizer trough of the underground station cap 13 are backfilled with low-grade micro-expansive concrete 15 to avoid insufficient backfill density, which can serve as the base plate support structure of the underground station 2.

[0041] S8, construct 4 underground shield tunnels on both sides of the underground station; It needs to be explained that the outer sides of the station end beam and the end column are aligned, and an end column corbel 17 is installed outside the station end beam to serve as the supporting structure of the elevated section bridge 3. The section bridge bearing 16 is connected to the upper structure of the elevated section bridge 3 to avoid eccentricity of the end beam and excessive size of the end column.

[0042] S9, construct 20 bridge piers in the elevated section; S10. The construction of the interval bridge bearings 16 on both sides of the elevated section and the elevated section beam body co-corridor type combined structure are completed.

[0043] In summary, with the aid of the above technical solutions of the present invention, the spacing between the elevated station pier 6 and the underground station frame column 8 of the present invention is consistent, and the column position eccentricity is strictly controlled, thereby avoiding the stress concentration problem caused by the inconsistency between different structures and improving the stability and safety of the structure. Both the elevated station 1 and the underground station 2 use steel-concrete columns filled with self-compacting concrete, and the size of the underground station frame column 8 is not less than that of the elevated station pier 6, thereby ensuring the reliability of vertical force transmission. The top longitudinal beam 7 of the subway station of the present invention is convexly arranged as a small pedestal for the elevated station pier 6, and a small force transmission armpit angle 9 is arranged at the junction of the top longitudinal beam 7 of the subway station and the frame column of the underground station, thereby ensuring the reliability of vertical force transmission and improving the convenience and quality of construction. The bottom longitudinal beam 11 of the subway station is turned upside down to avoid excessive density of steel bars, thereby reducing the complexity of steel bar construction and enhancing the construction quality of the structure. The frame column 8 of the underground station of the present invention is aligned with the center of the station pile foundation 14. The diameter and length of the station pile foundation 14 are determined according to the bearing capacity calculation. At the same time, a pile group foundation and a micro-expansive concrete 15 backfill are adopted to ensure the vertical force transmission capacity of the underground station pedestal 13 and the station pile foundation 14, thereby improving the bearing capacity and stability of the overall foundation.

[0044] In the present invention, unless otherwise clearly stipulated and limited, the terms such as "installation", "setting", "connection", "fixation" and "screw-on" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, ordinary technicians in this field can understand the specific meanings of the above terms in the present invention according to the specific circumstances.

[0045] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A rail transit multi-line shared corridor structure, comprising an elevated station (1), characterized in that: An underground station (2) is arranged at the bottom of the elevated station (1), elevated section bridges (3) are connected at both ends of the elevated station (1), and underground shield tunnels (4) are arranged at both ends of the bottom of the underground station (2).

2. A rail transit multi-line shared corridor structure according to claim 1, characterized in that: Elevated station platforms (5) are arranged on both sides of the interior of the elevated station (1), a plurality of elevated station piers (6) are arranged at the bottom of the elevated station (1), and the bottoms of the elevated station piers (6) penetrate the ground and are connected to the top of the underground station (2).

3. A rail transit multi-line shared corridor structure according to claim 2, characterized in that: The top of the underground station (2) is provided with a subway station top longitudinal beam (7) that matches the elevated station pier (6), and the bottom of the subway station top longitudinal beam (7) is connected to an underground station frame column (8).

4. A rail transit multi-line shared corridor structure according to claim 3, characterized in that: Small force-transmitting armpit angles (9) are provided between the bottom sides of the subway station top longitudinal beam (7) and the underground station frame columns (8).

5. A rail transit multi-line shared corridor structure according to claim 4, characterized in that: An underground station platform (10) is arranged at the inner bottom of the underground station (2), a subway station bottom longitudinal beam (11) is arranged at the inner bottom of the underground station platform (10), and force transmission armpit angles (12) are arranged between both sides of the subway station bottom longitudinal beam (11) and the inner bottom of the underground station (2).

6. A rail transit multi-line shared corridor structure according to claim 5, characterized in that: A plurality of underground station pedestals (13) are arranged at the bottom of the underground station (2); the bottom of the underground station frame column (8) passes through the top of the underground station platform (10) and the bottom longitudinal beam (11) of the subway station and is connected to the underground station pedestal (13); and a plurality of station pile foundations (14) are arranged at the bottom of the underground station pedestal (13).

7. A rail transit multi-line shared corridor structure according to claim 6, characterized in that: Micro-expansive concrete (15) is provided on both sides of the top of the underground station pedestal (13), and a section bridge support (16) is provided at the bottom of the elevated section bridge (3), and the bottom of the section bridge support (16) is connected to one side of the top of the elevated station pier (6) via an end column bracket (17).

8. The rail transit multi-line shared corridor structure according to claim 7, characterized in that: An underground station end wall (18) is provided at the end of the underground station (2), an underground station end reinforcement (19) is provided outside the underground station end wall (18), an elevated section bridge pier (20) is provided at the bottom of one end of the elevated section bridge (3), and a plurality of section bridge pile foundations (21) are provided at the bottom of the elevated section bridge pier (20).

9. A rail transit multi-line shared corridor structure according to claim 8, characterized in that: The elevated section bridge pier (20) is a single-column T-shaped pier.

10. A construction method for a rail transit multi-line shared corridor combined structure, used to realize the construction of a rail transit multi-line shared corridor combined structure according to any one of claims 1 to 9, characterized in that: The rail transit multi-line common corridor joint construction method comprises the following steps: S1. Construction of underground station foundation pit retaining structure and station pile foundation (14); S2, constructing the micro-expansion concrete (15) between the underground station pedestals (13), the bottom plate and the underground station pedestals (13), part of the side walls, the bottom plate longitudinal beams and the load-transmitting armpits (12); S3, constructing frame columns (8), middle plates, middle longitudinal beams, top plates, top longitudinal beams and small force-transmitting armpit angles (9) of underground stations; S4, constructing the elevated station piers (6) and backfilling the underground station; S5, construct elevated station structure and end column brackets (17); S6, construct the secondary structure of the platform slabs of the underground station and elevated station 1, and reinforce the underground station ends on both sides of the underground station (19); S7. Construction of pile foundation caps for elevated section bridges (3) on both sides of the station; S8, construct underground shield tunnels on both sides of the underground station (4); S9, construct elevated section bridge piers (20); S10. The construction of the section bridge supports (16) on both sides of the elevated section and the elevated section beam body co-corridor type combined structure are completed.

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