A combined structure for the joint construction and conversion of a station roof slab and a bridge pier column and a construction method thereof

Abstract

The present invention discloses a combined structure and construction method for the conversion of a station roof and a bridge pier. The combined structure includes a steel tube concrete support column, the upper portion of the steel tube concrete support column is connected to a steel-concrete horizontal frame beam, the steel-concrete horizontal frame beams cross and enclose to form a frame unit, a steel-concrete horizontal transfer beam is provided in the frame unit, the steel-concrete horizontal frame beam and the steel-concrete horizontal transfer beam are both connected to the cast-in-place steel-concrete roof, and a cast-in-place steel-concrete bridge pier is provided on the steel-concrete horizontal transfer beam; the construction method includes the following steps: constructing a steel-concrete pile foundation under the column; inserting a circular steel pipe; installing a reinforced steel structure; connecting the horizontal frame beam steel frame; connecting the horizontal transfer beam steel frame; laying out steel bars and tying the steel bars; making a formwork, pouring concrete, and forming a converted combined structure. The present invention ensures that the station itself is stressed while better controlling the settlement of the bridge, improving the seismic performance of municipal large-span bridges, taking into account the anti-floating requirements of underground structures, and having greater safety advantages.

Description

Technical Field

[0001] The present invention belongs to the field of underground building structures, and in particular relates to a combined structure and a construction method for the combined construction and conversion of a station roof and a bridge pier. Background Art

[0002] With the continuous development of urban construction, traffic conflicts are becoming increasingly severe. To fully utilize urban land resources, more and more cities are integrating underground rail transit, municipal surface roads, and elevated bridges to create a multi-dimensional, three-dimensional transportation system to alleviate this situation. When a rail transit station and a ground-level elevated bridge are located on the same road, their horizontal alignments will overlap. Generally, the ground-level elevated bridge is located in the middle of the road. When the road boundary is narrow, portal piers can be used to span the subway station, or separated island platforms or separated side platforms can be used to place the underground rail transit station under the elevated bridge, with the bridge pile foundation located in the middle of the subway station. Both of these solutions can ensure a clear distance of more than 3 meters between the elevated bridge abutment and the underground rail transit station. However, the use of portal piers increases land occupation, significantly impacts the ground landscape, and increases the investment in the elevated bridge. Separate underground stations require access to the platforms through passageways or concourses, which is inconvenient for passengers and significantly impacts passenger flow organization, operational management, equipment layout, and fire evacuation. Furthermore, the construction of the bridge and subway station significantly impacts each other.

[0003] When the longitudinal alignment of a subway station and an elevated bridge is parallel, and the bridge piers and station frame columns are co-located, a combined station-bridge solution is proposed. This involves placing the bridge piers on the station roof, typically in a stacked, separate configuration. The bridge load is transmitted via the station frame columns to the structural floor, and then to the foundation. This solution requires consistent planar alignment between the elevated bridge and station, and a perfect match between the bridge span and station column grid. This also results in the frame columns supporting the bridge piers being significantly larger than other frame columns, impacting the architectural effect. This approach presents numerous constraints and a limited scope of application.

[0004] Due to factors such as urban planning and the layout of existing buildings, the horizontal alignments of the viaduct and the subway station are generally not completely consistent, and there are certain differences. The bridge piers and the subway station frame column network cannot match, and the above-mentioned station-bridge combined construction plan cannot be applied. Summary of the Invention

[0005] The present invention is proposed to solve the problems existing in the prior art, and its purpose is to provide a combined structure and construction method for the combined construction and conversion of a station roof and a bridge pier.

[0006] The technical solution of the present invention is: a combined structure for the combined construction and conversion of a station roof and bridge piers, including steel tube concrete support columns, the upper part of the steel tube concrete support columns is connected to the steel-concrete horizontal frame beams, the steel-concrete horizontal frame beams cross and enclose to form a frame unit, the frame unit is provided with a steel-concrete horizontal conversion beam, the steel-concrete horizontal frame beams and the steel-concrete horizontal conversion beams are all connected to the cast-in-place steel-concrete roof, and the steel-concrete horizontal conversion beams are provided with cast-in-place steel-concrete bridge piers.

[0007] Furthermore, the steel-concrete horizontal transfer beams are arranged in a cross shape in the frame unit, and the cast-in-place steel-concrete piers are arranged at the intersection positions of the steel-concrete horizontal transfer beams.

[0008] Furthermore, a reinforcing steel structure is provided between the steel tube concrete support column and the steel-concrete horizontal frame beam to strengthen the connection between the two.

[0009] Furthermore, the reinforced steel structure is arranged at the intersection of the steel-concrete horizontal frame beams.

[0010] Furthermore, the reinforced steel structure includes a vertical circular steel pipe, a horizontal node plate is provided on the outer wall of the circular steel pipe, the node plate includes an upper node plate and a lower node plate, and stiffening plates are provided on the lower surface of the upper node plate, the upper surface of the lower node plate, and the outer wall of the circular steel pipe.

[0011] Furthermore, a steel bar connecting plate is provided on the outer wall of the circular steel tube, and the steel bar connecting plate is connected to the steel bars in the steel-concrete horizontal frame beam.

[0012] Furthermore, a horizontal frame beam steel frame is provided in the steel-concrete horizontal frame beam, the end of the horizontal frame beam steel frame is connected to the stiffening plate in the reinforced steel structure, and the flange of the horizontal frame beam steel frame is flush with the node plate.

[0013] Furthermore, top plate steel bar connecting plates and bolts are provided on the horizontal frame beam steel frame.

[0014] Furthermore, a horizontal transfer beam steel frame is provided in the steel-concrete horizontal transfer beam, and the horizontal transfer beam steel frame is connected to the horizontal frame beam steel frame.

[0015] Furthermore, flange connecting plates, top plate steel bar connecting plates and bolts are provided on the horizontal transfer beam steel frame.

[0016] A construction method for a combined structure of a station roof and a bridge pier, comprising the following steps:

[0017] A. Steel-concrete pile foundation under the construction column;

[0018] B. Insert the circular steel tube of the steel tube concrete support column during the construction of the steel-concrete pile foundation under the column;

[0019] C. Install a reinforced steel structure at the connection position on the top of the circular steel pipe;

[0020] D. Connect the horizontal frame beam steel frames in the steel-concrete horizontal frame beams;

[0021] E. Connect the horizontal transfer beam steel frames in the steel-concrete horizontal transfer beam;

[0022] F. Lay out steel bars and tie them;

[0023] G. Construct formwork and pour concrete to form a converted composite structure.

[0024] The beneficial effects of the present invention are as follows:

[0025] The present invention provides a solid foundation for the piers of municipal large-span bridges through the underground orthogonally arranged steel-concrete horizontal transfer beams, fully ensuring the smooth coordination of lines of different spatial structures such as subway stations, ground roads and elevated bridges, reducing the calculated thickness of the cast-in-place top plate of the subway station, and is suitable for the integrated construction of stations and bridges when the plane lines of subway stations and municipal bridges are inconsistent and the station column network and the span of the municipal bridge are not completely matched. It has fewer restrictive factors, clear structural forces, simple construction procedures, and little construction interference between subway stations and municipal bridges, which expands the application conditions for the combined construction of urban subway stations and elevated bridges, and is more economical, practical and aesthetically pleasing.

[0026] The present invention ensures the reliability of the connection by rigidly connecting the cast-in-situ steel-concrete piers of the municipal long-span bridge with the box-type frame structure system of the underground station structure into a whole. At the same time, a large number of composite structures such as steel-concrete beams and steel tube concrete columns are used to increase the rigidity of the underground structure, ensuring that the station itself is stressed while better controlling the bridge settlement, thereby improving the seismic performance of the municipal long-span bridge. The bridge load can meet the anti-floating requirements of the underground structure, and the safety is more advantageous.

[0027] The present invention reduces the difficulty of on-site welding by prefabricating steel tube concrete columns and steel concrete beam nodes in the factory, reduces the influence of construction errors and installation accuracy on structural stress, and improves production efficiency. The welded stiffening plates and ribs can enhance the strength of the connection points, and the steel bar connecting plates are provided to connect the cut and discontinuous steel bars, thereby achieving the continuity of the force transmission structure and ensuring the integrity and stability of the structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the planar structure of the present invention;

[0029] Figure 2 It is an elevation view of the steel-concrete horizontal frame beam and cast-in-situ steel-concrete bridge pier in the present invention;

[0030] Figure 3 This is the reinforcement diagram between the steel tube concrete support column and the steel-concrete horizontal frame beam in the present invention;

[0031] Figure 4 This is a schematic structural plan view of the steel tube concrete support column and the steel-concrete horizontal frame beam in the present invention;

[0032] Figure 5 It is a schematic structural plan view of the steel-concrete horizontal frame beam and the steel-concrete horizontal transfer beam in the present invention;

[0033] Figure 6 It is a vertical cross-sectional view between the steel-concrete horizontal frame beam and the steel-concrete horizontal transfer beam in the present invention;

[0034] Figure 7 It is a schematic structural plan view of the steel-concrete horizontal transfer beam and the cast-in-place steel-concrete bridge pier in the present invention;

[0035] Figure 8 It is a vertical cross-sectional view between the steel-concrete horizontal transfer beam and the cast-in-place steel-concrete bridge pier in the present invention;

[0036] Figure 9 This is a schematic diagram of the steel frame and reinforcement arrangement of the steel-concrete horizontal frame beam of the present invention;

[0037] Figure 10 This is a schematic diagram of the steel frame and reinforcement arrangement of the steel-concrete horizontal transfer beam in the present invention;

[0038] Figure 11 It is a vertical cross-sectional view of the steel tube concrete support column and the steel-concrete pile foundation under the column in the present invention;

[0039] in:

[0040] 1 Steel tube concrete support column 2 Steel-concrete horizontal frame beam

[0041] 3 Steel-concrete horizontal transfer beam 4 Cast-in-place steel-concrete top slab

[0042] 5 Cast-in-place steel-concrete bridge piers 6 Horizontal frame beam steel frame

[0043] 7 Horizontal transfer beam steel frame 8 Node plate

[0044] 9 Steel bar connection plate 10 Stiffening plate

[0045] 11 Rib 12 Rebar connection sleeve

[0046] 13 studs 14 concrete pouring holes

[0047] 15 Exhaust hole 16 Steel reinforcement in steel-concrete horizontal frame beam

[0048] 17 Steel-concrete horizontal transfer beam reinforcement 18 High-strength bolts

[0049] 19 Flange connection plate 20 Cast-in-place steel-concrete bridge pier reinforcement

[0050] 21 Steel-concrete pile foundation under the column. DETAILED DESCRIPTION

[0051] Hereinafter, the present invention will be described in detail with reference to the accompanying drawings and embodiments:

[0052] like Figures 1 to 11 As shown, a combined structure of a station roof and a bridge pier is constructed and converted, comprising a steel tube concrete support column 1, the upper part of the steel tube concrete support column 1 is connected to a steel-concrete horizontal frame beam 2, the steel-concrete horizontal frame beam 2 cross-encloses to form a frame unit, a steel-concrete horizontal conversion beam 3 is arranged in the frame unit, the steel-concrete horizontal frame beam 2 and the steel-concrete horizontal conversion beam 3 are both connected to a cast-in-place steel-concrete roof 4, and a cast-in-place steel-concrete bridge pier 5 is arranged on the steel-concrete horizontal conversion beam 3.

[0053] The steel-concrete horizontal transfer beams 3 are arranged in a cross shape in the frame unit, and the cast-in-situ steel-concrete bridge piers 5 are arranged at the intersection positions of the steel-concrete horizontal transfer beams 3.

[0054] A reinforcing steel structure is provided between the concrete-filled steel tube support column 1 and the steel-concrete horizontal frame beam 2 to reinforce the connection between the two.

[0055] The reinforced steel structure is arranged at the intersection of the steel-concrete horizontal frame beam 2.

[0056] The reinforced steel structure includes a vertical circular steel pipe, a node plate 8 is provided at the outer wall of the circular steel pipe, and the node plate includes an upper node plate and a lower node plate. Stiffening plates 10 are provided at the lower end of the upper node plate, the upper end of the lower node plate, and the outer wall of the circular steel pipe.

[0057] The reinforced steel structure includes a vertical circular steel pipe, and a horizontal node plate 8 is provided on the outer wall of the circular steel pipe. The node plate includes an upper node plate and a lower node plate. Stiffening plates 10 are provided on the lower surface of the upper node plate, the upper surface of the lower node plate, and the outer wall of the circular steel pipe.

[0058] A steel bar connecting plate 9 is further provided on the outer wall of the circular steel tube, and the steel bar connecting plate 9 is connected to the steel bar 16 in the steel-concrete horizontal frame beam 2 .

[0059] The steel-concrete horizontal frame beam 2 is provided with a horizontal frame beam steel frame 6 , the end of the horizontal frame beam steel frame 6 is connected to the stiffening plate 10 in the reinforced steel structure, and the flange of the horizontal frame beam steel frame 6 is flush with the node plate 8 .

[0060] The horizontal frame beam steel frame 6 is also provided with a top plate steel bar connecting plate 9 and bolts 13 .

[0061] The steel-concrete horizontal transfer beam 3 is provided with a horizontal transfer beam steel frame 7 , and the horizontal transfer beam steel frame 7 is connected to the horizontal frame beam steel frame 6 .

[0062] The horizontal transfer beam steel frame 7 is provided with a flange connecting plate 19 , a top plate steel bar connecting plate 9 and bolts 13 .

[0063] Specifically, the lower part of the steel tube concrete support column 1 is set in the steel-concrete pile foundation 21 under the column, and a steel bar connecting plate 9 is set at the outer wall of the steel tube concrete support column 1. The steel bar connecting plate 9 at the steel tube concrete support column 1 is used to connect with the structural bottom plate beam or the steel bars in the pedestal.

[0064] Specifically, the length of the steel tube concrete support column 1 needs to be inserted into the steel-concrete pile foundation 21 under the column according to the force calculation, thereby increasing the bearing capacity of the steel tube concrete support column 1.

[0065] Specifically, the steel tube concrete support column 1 and the steel-concrete horizontal frame beam 2 are located on the building axis of the subway station. The steel tube concrete support column 1, the steel-concrete horizontal frame beam 2, and the cast-in-place steel-concrete top plate 5 form a box-type frame structure system. A reinforced steel structure is arranged in the connection node between the steel tube concrete support column 1 and the steel-concrete horizontal frame beam 2.

[0066] More specifically, bolts 13 are provided on the lower outer wall of the concrete-filled steel tube support column 1 , and the bolts 13 strengthen the connection with the concrete in the steel-concrete pile foundation 21 under the column.

[0067] Specifically, a horizontal frame beam steel frame 6 is arranged in the steel-concrete horizontal frame beam 2. The horizontal frame beam steel frame 6 is I-shaped. A plurality of bolts 13 are arranged at the top and bottom end faces of the horizontal frame beam steel frame 6. The above-mentioned bolts 13 are used to achieve the firmness of the connection between the horizontal frame beam steel frame 6 and the concrete.

[0068] More specifically, a steel bar connecting plate 9 is provided at the web position of the horizontal frame beam steel frame 6, and the above-mentioned steel bar connecting plate 9 is connected to the steel bars in the cast-in-place steel-concrete top plate 4 that cannot penetrate the steel frame. The above-mentioned steel bar connecting plate 9 is connected to the web of the horizontal frame beam steel frame 6 by welding, and the above-mentioned steel bar connecting plate 9 is fixed to the steel bars in the cast-in-place steel-concrete top plate 4 that cannot penetrate the steel frame by welding.

[0069] The steel bar connecting plate 9 is located in the middle and lower part of the horizontal frame beam steel frame 6.

[0070] The continuity of force transmission between the steel-concrete horizontal frame beam 2 and the cast-in-place steel-concrete top slab 4 is achieved through the steel bar connecting plate 9 in the horizontal frame beam steel skeleton 6.

[0071] Specifically, the ends of the horizontal frame beam steel frames 6 are connected to the stiffening plates 10 in the reinforced steel structure, and the flanges of the horizontal frame beam steel frames 6 are flush with the node plates 8 in the reinforced steel structure.

[0072] Specifically, a horizontal transfer beam steel frame 7 is provided in the steel-concrete horizontal transfer beam 3, and the horizontal transfer beam steel frame 7 is connected to the horizontal frame beam steel frame 6. The horizontal transfer beam steel frame 7 is a double-jointed I-shaped steel lattice steel frame, which includes two I-shaped steel frames, and flange connecting plates 19 are provided between the upper flanges and the lower flanges of the two I-shaped steel frames to connect the two. The flange connecting plates 19 are used to fix the two I-shaped steel frames into a whole.

[0073] More specifically, bolts 13 are provided at both the upper and lower ends of the I-shaped steel frame, and the bolts 13 are used to ensure the firm connection between the horizontal transfer beam steel frame 7 and the concrete.

[0074] More specifically, a steel bar connecting plate 9 is provided at the web position of the horizontal transfer beam steel frame 7, and the above-mentioned steel bar connecting plate 9 is connected to the steel bars in the cast-in-place steel-concrete top plate 4 that cannot penetrate the steel frame. The above-mentioned steel bar connecting plate 9 is connected to the web of the horizontal transfer beam steel frame 7 by welding, and the above-mentioned steel bar connecting plate 9 is fixed to the steel bars in the cast-in-place steel-concrete top plate 4 that cannot penetrate the steel frame by welding.

[0075] The steel bar connecting plate 9 is located in the middle and lower part of the horizontal transfer beam steel frame 7 and is consistent with the steel bar connecting plate 9 in the steel-concrete horizontal frame beam 2.

[0076] The continuity of force transmission between the steel-concrete horizontal transfer beam 3 and the cast-in-place steel-concrete top plate 4 is achieved.

[0077] Specifically, the steel-concrete horizontal transfer beams 3 are arranged in a cross pattern in the frame unit, and the intersection of the steel-concrete horizontal transfer beams 3 is located directly below the cast-in-place steel-concrete bridge piers 5. The side ends of the steel-concrete horizontal transfer beams 3 are connected to the steel-concrete horizontal frame beams 2.

[0078] Specifically, the horizontal transfer beam steel frame 7 in the steel-concrete horizontal transfer beam 3 and the horizontal frame beam steel frame 6 in the steel-concrete horizontal frame beam 2 are connected through ribs 11 and high-strength bolts 18 .

[0079] Correspondingly, the horizontal transfer beam steel frames 7 at the intersection positions of the steel-concrete horizontal transfer beams 3 are also connected by ribs 11 and high-strength bolts 18 .

[0080] The continuity of force transmission between the steel-concrete horizontal transfer beam 3 and the steel-concrete horizontal frame beam 2 is achieved, ensuring that the bridge pier load is effectively transmitted to all steel tube concrete columns 1 in the composite structural system, effectively reducing the cross-sectional size of a single steel tube concrete column.

[0081] Specifically, the vertical steel bars in the cast-in-situ steel-concrete pier 5 are anchored into the steel-concrete horizontal transfer beam 3 , and the vertical steel bars are connected to the steel sleeves welded on the steel frame flanges at the places where the anchorage length is not met.

[0082] The continuity of force transmission between the steel-concrete horizontal transfer beam 3 and the cast-in-place steel-concrete bridge pier 5 is achieved.

[0083] like Figure 1 As shown, steel tube concrete support columns 1 are provided at the intersection positions of the steel-concrete horizontal frame beams 2 . The steel tube concrete support columns 1 are evenly arranged, and a number of frame units are formed in the steel-concrete horizontal frame beams 2 .

[0084] The steel-concrete horizontal transfer beam 3 is arranged in the frame unit of the steel-concrete horizontal frame beam 2. The intersection position of the steel-concrete horizontal transfer beam 3 is located below the cast-in-place steel-concrete bridge pier 5. The steel bars in the cast-in-place steel-concrete bridge pier 5 are connected to the steel-concrete horizontal transfer beam 3.

[0085] Specifically, the reinforced steel structure includes a circular steel pipe, a node plate 8, a steel bar connecting plate 9, a stiffening plate 10, a rib plate 11 and a steel bar connecting sleeve 12. The node plate 8 and the steel bar connecting plate 9 are both circular steel ring plates. The node plate 8 and the steel bar connecting plate 9 are divided into two groups, which are respectively located at the upper and lower parts of the circular steel pipe node range. The stiffening plate 10 is located between the upper node plate and the lower node plate, and the stiffening plates 10 are arranged at equal intervals along the circular steel pipe.

[0086] The node plate 8 is provided with a number of exhaust holes 15 on the inside and outside of the circular steel tube. The steel bar connecting plate 9 is connected to the steel bars 16 in the steel-concrete horizontal frame beam at the upper and lower parts of the node respectively. The two ends of the I-shaped steel frame in the steel-concrete horizontal frame beam 2 in each span are respectively connected to the reinforced steel structure. The steel frame flange of the steel-concrete horizontal frame beam 2 is flush with the node plate 8.

[0087] Thereby, the connection strength between the steel-concrete horizontal frame beam 2 and the steel tube concrete support column 1 can be enhanced.

[0088] A construction method for a combined structure of a station roof and a bridge pier, comprising the following steps:

[0089] A. Construction of steel-concrete pile foundation under the column 21;

[0090] B. Inserting the circular steel tube of the concrete-filled steel tube support column 1 during the construction of the steel-concrete pile foundation 21 under the column;

[0091] C. Install reinforcement steel structure at the connection position of circular steel pipe;

[0092] D. Connecting the horizontal frame beam steel frame 6 in the steel-concrete horizontal frame beam 2;

[0093] E. Connecting the horizontal transfer beam steel frame 7 in the steel-concrete horizontal transfer beam;

[0094] F. Lay out steel bars and tie them;

[0095] G. Construct formwork and pour concrete to form a converted composite structure.

[0096] Specifically, step A is to construct the steel-concrete pile foundation 21 under the column, and the specific process is as follows:

[0097] First, determine the number and position of the steel tube concrete support columns 1;

[0098] Then, the steel-concrete pile foundation 21 under the construction column is poured at the corresponding position.

[0099] Specifically, in step B, the circular steel tube of the steel tube concrete support column 1 is inserted during the construction of the steel-concrete pile foundation 21 under the column. The specific process is as follows:

[0100] First, a steel bar connecting plate 9 is provided on the lower outer wall of the circular steel tube of the steel tube concrete support column 1, and is connected to the steel bars in the structural bottom plate beam or the pedestal through the steel bar connecting plate 9;

[0101] Then, studs 13 are provided on the lower outer wall of the circular steel tube of the steel tube concrete support column 1 to increase the stability of the connection between the circular steel tube and the concrete in the steel-concrete pile foundation 21 under the column.

[0102] Specifically, step C is to install a reinforced steel structure at the connection position of the circular steel pipe. The specific process is as follows:

[0103] First, determine the node installation position of the circular steel tube outer wall of the steel tube concrete support column 1;

[0104] Then, the node plate 8, the steel bar connection plate 9 and the stiffening plate 10 for reinforcing the steel structure are installed on the circular steel pipe.

[0105] Specifically, step D connects the horizontal frame beam steel frame 6 in the steel-concrete horizontal frame beam 2, and the specific process is as follows:

[0106] First, the horizontal frame beam steel frame 6 is prefabricated in the factory, and the steel connecting plate 9 is welded in advance at the web to serve as the connection foundation for the cast-in-place steel-concrete top plate 4;

[0107] Then, the horizontal frame beam steel frame 6 in the steel-concrete horizontal frame beam 2 is connected to the reinforced steel structure.

[0108] Specifically, step E connects the horizontal transfer beam steel frame 7 in the steel-concrete horizontal transfer beam. The specific process is as follows:

[0109] First, the horizontal transfer beam steel frame 7 is prefabricated in the factory, and the steel connecting plate 9 is welded in advance at the web to serve as the connection foundation for the cast-in-place steel-concrete top plate 4;

[0110] Then, the horizontal transfer beam steel frame 7 in the steel-concrete horizontal transfer beam 3 is connected to the horizontal frame beam steel frame 6;

[0111] More specifically, the horizontal transfer beam steel frame 7 in step E further includes the following steps:

[0112] Before installation, the horizontal transfer beam steel frame 7 needs to connect the two I-shaped steel frames, and the flanges of the I-shaped steel frames are connected into a whole through the flange connecting plate 19.

[0113] More specifically, the horizontal frame beam steel frame 6 in step D and the horizontal transfer beam steel frame 7 in step E need to be welded with studs 13 at the top and bottom before installation.

[0114] Specifically, step F is to lay out the steel bars and tie them together. The specific process is as follows:

[0115] First, arrange the steel bars in the steel-concrete horizontal frame beam 2;

[0116] Then, arrange the steel bars in the steel-concrete horizontal transfer beam 3;

[0117] Then, arrange the steel bars in the cast-in-place steel-concrete top slab 4;

[0118] Then, arrange the steel bars in the cast-in-place steel-concrete pier 5;

[0119] Finally, weld and fix the relevant nodes of the steel bars to the reinforced steel structure, and tie the remaining steel bars.

[0120] Specifically, step G comprises making a formwork and pouring concrete to form a converted composite structure;

[0121] Formwork is applied to the steel-concrete horizontal frame beam 2, the steel-concrete horizontal transfer beam 3, the cast-in-place steel-concrete top slab 4, and the cast-in-place steel-concrete bridge pier 5 respectively, and then concrete is poured to form a converted composite structure.

[0122] The present invention provides a solid foundation for the piers of municipal large-span bridges through the underground orthogonally arranged steel-concrete horizontal transfer beams, fully ensuring the smooth coordination of lines of different spatial structures such as subway stations, ground roads and elevated bridges, reducing the calculated thickness of the cast-in-place top plate of the subway station, and is suitable for the integrated construction of stations and bridges when the plane lines of subway stations and municipal bridges are inconsistent and the station column network and the span of the municipal bridge are not completely matched. It has fewer restrictive factors, clear structural forces, simple construction procedures, and little construction interference between subway stations and municipal bridges, which expands the application conditions for the combined construction of urban subway stations and elevated bridges, and is more economical, practical and aesthetically pleasing.

[0123] The present invention ensures the reliability of the connection by rigidly connecting the cast-in-situ steel-concrete piers of the municipal long-span bridge with the box-type frame structure system of the underground station structure. At the same time, a large number of composite structures such as steel-concrete beams and steel tube concrete columns are used to increase the rigidity of the underground structure. While ensuring the station's own stress, the bridge settlement is better controlled, thereby improving the seismic performance of the municipal long-span bridge. The bridge load can meet the anti-floating requirements of the underground structure, and the safety is more advantageous.

[0124] The present invention reduces the difficulty of on-site welding by prefabricating steel tube concrete columns and steel concrete beam nodes in the factory, reduces the influence of construction errors and installation accuracy on structural stress, and improves production efficiency. The welded stiffening plates and ribs can enhance the strength of the connection points, and the steel bar connecting plates are provided to connect the cut and discontinuous steel bars, thereby achieving the continuity of the force transmission structure and ensuring the integrity and stability of the structure.

Claims

1. A combined structure for converting a station roof and a bridge pier, comprising a steel tube concrete support column (1), characterized in that: The upper portion of the steel tube concrete support column (1) is connected to the steel-concrete horizontal frame beam (2), the steel-concrete horizontal frame beam (2) cross-encloses to form a frame unit, a steel-concrete horizontal transfer beam (3) is provided in the frame unit, the steel-concrete horizontal frame beam (2) and the steel-concrete horizontal transfer beam (3) are both connected to the cast-in-place steel-concrete top plate (4), and a cast-in-place steel-concrete bridge pier (5) is provided on the steel-concrete horizontal transfer beam (3); The steel-concrete horizontal transfer beams (3) are arranged in a cross shape in the frame unit, and the cast-in-situ steel-concrete bridge piers (5) are arranged at the intersection positions of the steel-concrete horizontal transfer beams (3); A reinforcing steel structure is provided between the steel tube concrete support column (1) and the steel-concrete horizontal frame beam (2) to reinforce the connection between the two; The reinforced steel structure is arranged at the intersection of the steel-concrete horizontal frame beam (2); The reinforced steel structure comprises a vertical circular steel tube, a horizontal node plate (8) is provided on the outer wall of the circular steel tube, the node plate comprises an upper node plate and a lower node plate, and a stiffening plate (10) is provided on the lower surface of the upper node plate, the upper surface of the lower node plate, and the outer wall of the circular steel tube; A steel bar connecting plate (9) is further provided on the outer wall of the circular steel tube, and the steel bar connecting plate (9) is connected to the steel bar (16) inside the steel-concrete horizontal frame beam (2); The steel-concrete horizontal frame beam (2) is provided with a horizontal frame beam steel frame (6), the end of the horizontal frame beam steel frame (6) is connected to the stiffening plate (10) in the reinforced steel structure, the flange of the horizontal frame beam steel frame (6) is flush with the node plate (8), and the horizontal frame beam steel frame (6) is also provided with a top plate steel bar connecting plate (9) and bolts (13); The steel-concrete horizontal transfer beam (3) is provided with a horizontal transfer beam steel frame (7), and the horizontal transfer beam steel frame (7) is connected to the horizontal frame beam steel frame (6); The horizontal transfer beam steel frame (7) is provided with a flange connection plate (19), a top plate steel bar connection plate (9) and bolts (13).

2. The construction method of a combined structure for converting a station roof and a bridge pier according to claim 1 is characterized by: The following steps are involved: A. Construction of steel-concrete pile foundation under the column (21); B. Inserting the circular steel tube of the steel tube concrete support column (1) during the construction of the steel-concrete pile foundation (21) under the column; C. Install a reinforced steel structure at the connection position on the top of the circular steel pipe; D. Connecting the horizontal frame beam steel frame (6) in the steel-concrete horizontal frame beam (2); E. Connecting the horizontal transfer beam steel frame (7) in the steel-concrete horizontal transfer beam; F. Lay out steel bars and tie them; G. Construct formwork and pour concrete to form a converted composite structure.

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