A station-bridge combined structure based on a single-column station and a construction method thereof

Abstract

The application discloses a station-bridge combined structure based on a single-column station, which comprises a single-column station arranged below a river and a bridge arranged above the single-column station, and the single-column station and the bridge are oblique to the river; a plurality of cross beams are arranged at the top of the single-column station at intervals; a plurality of station vertical columns and a plurality of station hidden columns are arranged at the middle and the side walls of the single-column station at intervals respectively; the middle of the cross beam is supported on the station vertical column; the two ends of the cross beam are supported on a pair of the station hidden columns; and the bridge pier of the bridge is arranged on the cross beam. The application further provides a construction method of the station-bridge combined structure based on the single-column station. The station-bridge combined structure based on the single-column station adds the station hidden columns in the side walls of the single-column station, sets the cross beam on the basis of the original station vertical column, lets the bridge pier of the bridge stand on the cross beam, and can transmit the stress of the bridge to the foundation, so that the connection between the bridge and the single-column station is reasonable, the force transmission is reasonable, and the structural design is reasonable.

Description

Technical Field

[0001] This invention belongs to the field of subway station and bridge construction, and in particular relates to a combined station and bridge structure and its construction method. Background Technology

[0002] In areas with soft soil and numerous rivers, subway stations often need to be built under rivers. If a bridge crosses the river, the station and bridge are usually combined in that location. There are three main types of combined station-bridge construction. The first type involves a single pier in the center of the station, with the remaining space distributed to the station pillars via a platform (e.g.,...). Figure 1 (as shown in (a)); the second type uses portal piers, with the bridge and station built separately (as shown in (a)). Figure 1 (as shown in (b)); the third method is to treat it by setting up a box culvert above the station (as shown in (b)). Figure 1 (as shown in (c)).

[0003] However, due to the influence of the railway line, stations, bridges, and rivers often intersect at an angle. For such intersections, not only must the architectural design be reasonable, but the existing water crossing area must also be guaranteed. The first option, using a double-column station, would require adding more columns for the angled intersection, which contradicts the architectural design concept. The second option, with its large portal pier span (especially when the bridge deck is wide), would require larger piers to meet the requirements, resulting in a significant difference from the original bridge and impacting the city's aesthetics. The third option, influenced by the river's cross-sectional area, would lead to the bridge's cross-sectional area not meeting the requirements.

[0004] In summary, there is currently no corresponding vehicle-bridge combined construction form for situations where stations, bridges, and rivers intersect at an angle. Therefore, it is necessary to design a station-bridge combined construction structure for such situations, ensuring that the structure meets the requirements of the river's cross-sectional area, bridge settlement requirements, station stress and deformation requirements, and architectural design requirements. Summary of the Invention

[0005] The technical problem to be solved by this invention is to overcome the deficiencies and defects mentioned in the background art above, and to provide a combined station-bridge structure based on a single-column station and its construction method in the case of a station, bridge, and river intersecting at an oblique angle. This combined station-bridge structure meets both the requirements of the river's cross-sectional area and the requirements for bridge settlement and station stress and deformation. To solve the above technical problem, the technical solution proposed by this invention is as follows:

[0006] A combined station-bridge structure based on a single-column station includes a single-column station located below a river and a bridge located above the single-column station. Both the single-column station and the bridge intersect the river at an angle. Multiple crossbeams are spaced apart on the top of the single-column station. Multiple station columns and multiple station concealed columns are spaced apart in the middle and side walls of the single-column station, respectively. The middle of each crossbeam is supported on one of the station columns, and the two ends of each crossbeam are supported on a pair of station concealed columns. The bridge piers are located on the crossbeams. In other words, the crossbeams are mainly supported at three points, located in the middle and at both ends, and are respectively supported and fixed by the station columns (middle of the crossbeam) and the station concealed columns (both ends of the crossbeam).

[0007] In the aforementioned combined bridge and station structure, preferably, the arrangement direction of the crossbeams is consistent with the direction of the river's flow, and the arrangement direction of the row of bridge piers in the transverse direction is also consistent with the direction of the river's flow. This arrangement maximizes the fulfillment of the river's cross-flow area requirements and minimizes the impact of the construction bridge and station on the river's flow.

[0008] In the aforementioned combined station-bridge structure, preferably, the piers in the transverse direction are located at the positions of the station columns and / or concealed station columns on the crossbeams. In a more preferred embodiment, four piers are arranged in the transverse direction: two piers are located above the concealed station columns on both sides, and the other two piers are located above and adjacent to the station columns. This arrangement allows the load borne by the bridge structure to be transferred from the superstructure to the crossbeams via the piers, then to the abutments and base slabs via the station columns, station columns, and side walls, and finally to the foundation, resulting in excellent structural load transfer.

[0009] In the aforementioned combined station-bridge structure, preferably, the number of concealed columns on each side wall of the single-column station matches the number of crossbeams. This ensures that a concealed column is provided beneath each crossbeam, guaranteeing that the bridge's load is transferred to the foundation below through the crossbeams. In this invention, the concealed columns can be obtained by locally thickening and reinforcing the side walls.

[0010] In the aforementioned combined bridge and station structure, preferably, the bridge abutments are also located on the crossbeams, and the crossbeams and abutments are connected by pre-embedded steel bars. Having the abutments on the crossbeams helps ensure that the forces acting on the bridge above are transferred downwards to the foundation through the crossbeams. Steel bars can be pre-embedded in the corresponding crossbeams, and the abutment portion can be erected subsequently using these steel bars.

[0011] In the aforementioned combined station-bridge structure, preferably, a pile-supported structure is provided beneath the single-column station. This pile-supported structure includes pile foundations and a pile cap, with the pile cap positioned above the pile foundations. The pile-supported structure supports the single-column station, reducing the overall settlement of the station and bridge in soft soil areas. Adding a pile cap at the bottom solves the settlement problem of the single-column station and bridge without thickening the base slab, thus saving costs.

[0012] In the aforementioned combined station-bridge structure, preferably, the number of piers is the same as the number of crossbeams, and each crossbeam has a corresponding pier below it. The station columns and concealed columns supporting the crossbeams are all located on the piers. This arrangement facilitates the transfer of force from the crossbeams to the foundation through the piers.

[0013] In the aforementioned combined station-bridge structure, preferably, a row of pile foundations is provided beneath each of the aforementioned piers. The purpose of providing a row of pile foundations at the bottom of the piers is to reduce the overall settlement of the station and bridge in soft soil areas.

[0014] In the aforementioned combined station-bridge structure, preferably, the bottom of the single-column station may also be reinforced with a three-axis mixing pile layer, and the foundation adopts a large foundation type with a width of 2m and a thickness of 2m downwards. The large foundation type with a width of 2m and a thickness of 2m downwards at the bottom of the single-column station is arranged along the station's concealed columns and the station's standing columns to ensure uniform stress distribution and reduce uneven settlement. The foundation below the station floor slab is reinforced with three-axis mixing piles to increase the bearing capacity of the foundation. Optionally, the three-axis mixing piles reinforce the downward-facing beams within a 1.5m width on both sides, and the bottom of the remaining foundation pit is reinforced with strip reinforcement; existing conventional technologies can be directly adopted.

[0015] In the aforementioned combined bridge and station structure, preferably, H-beams are embedded within the crossbeams. The crossbeams can be relatively tall concrete beams. If the bridge load is large or the river surface is restricted, the width of the crossbeams should not be too large; a steel-concrete composite structure with embedded H-beams can be used, significantly reducing the crossbeam size.

[0016] In the aforementioned combined station-bridge structure, preferably, C50 concrete square columns can be used for the station pillars. If the bridge span is large, steel-concrete composite columns can be used. The station pillars are not only located below the crossbeams, but multiple station pillars can also be selectively placed in the middle of a single-pillar station to increase the structural stability of the single-pillar station.

[0017] As a general technical concept, the present invention also provides a construction method for the above-mentioned station-bridge combined structure based on a single-column station, comprising the following steps:

[0018] S1: Construct the pile foundation and pile cap at the bottom of the single-column station, and then construct the base slab, side walls, top slab and station columns of the single-column station on the pile cap. Simultaneously construct the station's hidden columns while constructing the side walls.

[0019] S2: Construct a crossbeam on the top slab of the single-column station, with the middle of the crossbeam supported on the station column and the two ends of the crossbeam supported on a pair of the station columns.

[0020] S3: Construct bridge piers and / or abutments on the crossbeams, and waterproof the top slab of the single-column station, and then construct the bridge superstructure to complete the construction.

[0021] Specifically, in the above construction methods, when constructing the pile foundation and abutment at the bottom of a single-column station, for the construction of a subway station on soft soil, it is necessary to carry out foundation pit excavation and pit bottom reinforcement treatment, such as using triaxial mixing pile foundation reinforcement to increase the bearing capacity of the foundation.

[0022] When a station, bridge, or river intersects at an angle, requiring combined station-bridge construction, it's often difficult to utilize existing station columns in a two-column station, necessitating the addition of separate columns, which is detrimental to the station's column grid layout. This invention employs a single-column station for combined station-bridge construction, optimizing the single-column station structure by adding components such as crossbeams, concealed columns, and foundations to transfer the bridge's load to the underlying foundation. This combined station-bridge structure, applied to situations where rivers, roads, and stations intersect at an angle, effectively meets the river management department's requirements regarding waterway area. Furthermore, the single-column station in this combined station-bridge structure features reliable connection to the bridge, reasonable force transmission, and meets both bridge settlement and station stress-deformation requirements.

[0023] Compared with the prior art, the advantages of the present invention are as follows:

[0024] 1. The station-bridge combined structure based on a single-column station of the present invention adds a hidden column to the side wall of the single-column station, and then sets a crossbeam based on the original station column, so that the bridge piers stand on the crossbeam. This can transfer the force of the bridge to the foundation. The connection between the bridge and the single-column station is reasonable, the force transmission is reasonable, and the structural design is reasonable. It is a brand-new station-bridge combined structure in the case of station-bridge crossing the river at an angle, and has broad application prospects.

[0025] 2. The construction method of the station-bridge combined structure based on single-column station of the present invention is simple and easy to implement. Compared with the traditional station-bridge combined structure, no new equipment needs to be added and the amount of construction work is not increased. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of a combined station and bridge structure in the existing technology.

[0028] Figure 2 This is a schematic diagram of the cross-sectional structure of the station-bridge combined structure based on a single-column station according to the present invention.

[0029] Figure 3 This is a schematic diagram of the longitudinal section of the station-bridge combined structure based on a single-column station according to the present invention.

[0030] Figure 4 This is a plan view of the base plate of the single-column station based on the combined station-bridge structure of the single-column station according to the present invention.

[0031] Figure 5 This is a plan view of the roof slab of a single-column station based on the combined station-bridge structure of a single-column station according to the present invention.

[0032] Figure 6 This is a schematic diagram of the structure of the station-bridge combined structure based on a single-column station of the present invention, in which H-shaped steel is pre-embedded in the crossbeam.

[0033] Legend:

[0034] 1. Triaxial mixing pile reinforcement layer; 2. Crossbeam; 3. Single column station; 4. Station column; 5. Station concealed column; 6. Pier cap; 7. Pile foundation; 8. Bridge pier; 9. Bridge abutment; 10. River edge; 11. Waterproof layer. Detailed Implementation

[0035] To facilitate understanding of the present invention, the present invention will be described more fully and in detail below with reference to the accompanying drawings and preferred embodiments, but the scope of protection of the present invention is not limited to the following specific embodiments.

[0036] Unless otherwise defined, all technical terms used herein have the same meaning as commonly understood by those skilled in the art. The technical terms used herein are for the purpose of describing particular embodiments only and are not intended to limit the scope of the invention.

[0037] Unless otherwise specified, all raw materials, reagents, instruments and equipment used in this invention can be purchased from the market or prepared by existing methods.

[0038] Example:

[0039] like Figures 2-5As shown, the station-bridge combined structure based on a single-column station in this embodiment includes a single-column station 3 located below the river and a bridge located above the single-column station 3. Both the single-column station 3 and the bridge are oblique to the river (in this embodiment, the specific angle of oblique intersection can be determined according to design needs, such as 60° in this embodiment). Multiple crossbeams 2 are spaced apart on the top of the single-column station 3. Multiple station columns 4 and multiple station concealed columns 5 are spaced apart on the middle and side walls of the single-column station 3, respectively. The middle part of the crossbeam 2 is supported on the station columns 4, and the two ends of the crossbeam 2 are supported on a pair of station concealed columns 5. The bridge piers 8 are located on the crossbeams 2.

[0040] In this embodiment, the arrangement direction of the crossbeam 2 is consistent with the direction of the river flow, and the arrangement direction of the row of bridge piers 8 in the transverse direction is also consistent with the direction of the river flow. From Figure 5 As can be seen from the diagram, the crossbeam 2 and the row of piers 8 in the transverse direction are all parallel to the river edge line 10, which helps to reduce the impact of the construction of the piers 8 on the river's cross-flow area.

[0041] In this embodiment, the row of piers 8 in the transverse direction of the bridge is located at the position of the crossbeam 2 at the station column 4 and / or the station concealed column 5. Specifically, in this embodiment, there are 4 piers 8 in the transverse direction of the bridge, 2 of which are located at the station concealed column 5 and 2 are adjacent to the station column 4, that is, located as close as possible to the middle of the single column station 3, so that the force of the piers 8 is transmitted downward through the station concealed column 5 and the station column 4.

[0042] In this embodiment, the number of station hidden columns 5 provided on each side wall of the single-column station 3 matches the number of crossbeams 2.

[0043] like Figure 3 As shown, in this embodiment, the bridge abutment 9 is also located on the crossbeam 2, and the crossbeam 2 and the abutment 9 are connected by pre-embedded steel bars. Steel bars can be pre-embedded in the crossbeam 2 first, and then the abutment 9 can be erected using these pre-embedded steel bars.

[0044] In this embodiment, a pile-supported structure is provided below the single-column station 3. The pile-supported structure includes pile foundations 7 and pile caps 6, with the pile caps 6 located above the pile foundations 7. Specifically, in this embodiment, a row of pile foundations 7 is provided below each pile cap 6. The number of pile caps 6 is the same as that of the crossbeams 2, and a corresponding pile cap 6 is provided below each crossbeam 2. The station columns 4 and station concealed columns 5 used to support the crossbeams 2 are all located on the pile caps 6.

[0045] In this embodiment, the bottom of the single-column station 3 may optionally be reinforced with a triaxial mixing pile layer 1, and the foundation 6 may optionally be a large foundation with a width of 2m and a thickness of 2m downwards. Both the triaxial mixing pile reinforcement layer 1 and the foundation 6 can adopt existing conventional technologies and arrangements. Of course, if the foundation reinforcement requirement is not significant, the triaxial mixing pile reinforcement layer 1 may not be used in this embodiment.

[0046] like Figure 6 As shown in this embodiment, H-beams can be embedded in the crossbeam 2. This type of crossbeam 2 is suitable for situations where the bridge load is large. If the bridge load is not large, the H-beams in the crossbeam 2 can be removed.

[0047] The construction method for the combined station-bridge structure based on a single-column station in this embodiment includes the following steps:

[0048] S1: First, excavate the foundation pit and reinforce the bottom of the pit. Then, construct the pile foundation 7 and the pile cap 6 at the bottom of the single column station 3. Next, construct the bottom slab, side walls, top slab and station column 4 of the single column station 3 on the pile cap 6. Simultaneously construct the station hidden column 5 while constructing the side walls.

[0049] S2: Construct a crossbeam 2 on the top slab of the single-column station 3, and set the middle support of the crossbeam 2 on the station column 4, and set the two ends of the crossbeam 2 on a pair of station hidden columns 5.

[0050] S3: Construct piers 8 and / or abutments 9 on beam 2, and perform waterproofing treatment on the top slab of single-column station 3 (apply waterproof layer 11), and then construct the superstructure of the bridge to complete the construction.

[0051] In this embodiment, the station-bridge combined structure based on the single-column station 3 adds a hidden station column 5 to the side wall of the single-column station 3, and then sets up a crossbeam 2 based on the original station column 4, so that the bridge pier 8 stands on the crossbeam 2, which can transfer the bridge force to the foundation. The connection between the bridge and the single-column station 3 is reasonable, the force transmission is reasonable, and the structural design is reasonable. It is a brand-new station-bridge combined structure in the case of the station-bridge intersecting the river at an angle.

Claims

1. A station-bridge combined structure based on a single-column station, characterized by The system includes a single-column station (3) located below the river and a bridge located above the single-column station (3). Both the single-column station (3) and the bridge are oblique to the river. The top of the single-column station (3) is provided with multiple crossbeams (2) spaced apart. The middle part and the side walls of the single-column station (3) are provided with multiple station columns (4) and multiple station hidden columns (5) spaced apart. The middle part of the crossbeam (2) is supported on the station column (4), and the two ends of the crossbeam (2) are supported on a pair of station hidden columns (5). The bridge piers (8) of the bridge are located on the crossbeam (2). The arrangement direction of the crossbeam (2) is consistent with the direction of the river flow, and the arrangement direction of the row of bridge piers (8) in the transverse direction is also consistent with the direction of the river flow. The row of piers (8) in the transverse direction of the bridge is located at the position of the crossbeam (2) at the position of the station post (4) and / or the station concealed post (5); The number of the station's hidden columns (5) on each side wall of the single-column station (3) matches the number of the crossbeams (2).

2. The station bridge hybrid structure of claim 1, wherein The bridge abutment (9) of the bridge is also located on the crossbeam (2), and the crossbeam (2) and the bridge abutment (9) are connected by pre-embedded steel bars.

3. The station-bridge hybrid structure according to claim 1 or 2, characterized in that, The single-column station (3) is provided with a pile bearing structure below it. The pile bearing structure includes a pile foundation (7) and a pile cap (6). The pile cap (6) is located above the pile foundation (7).

4. The station bridge hybrid structure of claim 3, wherein The number of the platform (6) is the same as that of the crossbeam (2), and each crossbeam (2) is provided with a platform (6) below it. The station pillars (4) and station hidden pillars (5) used to support the crossbeam (2) are all located on the platform (6).

5. The station bridge hybrid structure of claim 3, wherein Each of the aforementioned pile caps (6) is provided with a row of the aforementioned pile foundations (7) below it.

6. The station-bridge hybrid structure according to claim 1 or 2, characterized by The crossbeam (2) is embedded with an H-shaped steel.

7. A method of constructing a single-column-station-based station-bridge combined structure according to any one of claims 1 to 6, characterized by, Includes the following steps: S1: Construct the pile foundation (7) and pile cap (6) at the bottom of the single column station (3), and then construct the bottom plate, side wall, top plate and station column (4) of the single column station (3) on the pile cap (6). Simultaneously construct the station hidden column (5) while constructing the side wall. S2: Construct a crossbeam (2) on the top plate of the single-column station (3), and set the middle part of the crossbeam (2) on the station column (4), and set the two ends of the crossbeam (2) on a pair of station columns (5); S3: Construct piers (8) and / or abutments (9) on the crossbeam (2), and waterproof the top plate of the single-column station (3) before constructing the superstructure of the bridge, thus completing the construction.

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