Rail transit elevated section double-line newly-added single turnout transformed bridge structure

Abstract

The utility model relates to the field of reconstruction and expansion of existing elevated rail transit, in particular to a rail transit elevated section double-line newly-added single turnout reconstruction bridge structure, which comprises widening bearing platforms matched with existing line bearing platforms, and the widening bearing platforms are connected with the existing line bearing platforms to form a combined structure. A newly-built pile foundation is arranged below the widening bearing platform, a newly-built turnout box girder and a newly-built simply-supported box girder are supported above a combined structure formed by the widening bearing platform and the existing line bearing platform, the newly-built turnout box girder is used for erecting an existing line and a single turnout, and the newly-built simply-supported box girder is used for being connected with the turnout in sequence. The utility model has the advantages that the problem of the design of the upper part, the lower part and the foundation of the turnout junction bridge structure additionally arranged on the elevated section of the urban rail transit is solved, the construction is feasible, economic and reasonable, green and environment-friendly, the effect is good, and the popularization and use values are very good.

Description

Technical Field

[0001] The utility model relates to the field of reconstruction and expansion of existing elevated rail transit, and in particular to a bridge structure for reconstruction of a double-track elevated section of rail transit with a newly added single-opening turnout. Background Art

[0002] With the rapid development of urban rail transit, the integration of new lines into existing lines for shared operation has become a common practice in transportation route planning and construction. However, there are few examples of elevated rail transit connections. The integration of new lines and switches increases bridge deck limits and loads, making the existing bridge deck, piers, and foundations no longer able to meet the required load-bearing capacity and spatial arrangement.

[0003] The retrofitting of a bridge with a new single-turnout track typically involves replacing a simply supported beam with a turnout beam structure. Regulations require that mainline turnouts should not span beam gaps, and the distance between the start and end of the turnout and the beam gap should be at least 18 meters. The turnout area should be a continuous structure with equal spans, and the maximum span should not exceed 48 meters. Railway bridge decks are generally wide, requiring three to five spans of continuous turnout beams to meet track spacing and clearance requirements. To reduce the deadweight load on the turnout beams, steel beams are often used. During reconstruction, to minimize interference with existing piers, new piers are constructed between them, and the connecting piers are widened with abutments and pier extensions. This widening often results in larger lateral dimensions for the piers. If railway bridge reconstruction techniques are simply applied to guide urban rail transit bridge connections, considering landscape, environmental impact assessment, and construction requirements, these shortcomings—for example, the thicker piers after widening, the noise impact of steel beams, and the difficulty of large-scale demolition of existing structures within complex urban spaces—are not in line with the concept of green and environmentally friendly urban construction. Summary of the Invention

[0004] The purpose of this utility model is to provide a bridge structure for the reconstruction of a double-track single-opening turnout in an elevated section of rail transit based on the deficiencies of the above-mentioned prior art. By utilizing the characteristics of a narrow deck, light weight, and slender piers of a rail transit bridge, the bridge edge is cut to separate the deck lines to reduce the span of the turnout beam. At the same time, the existing pier is widened, and a new single-column pier is built on the widened pier to support the concrete turnout beam, making full use of the existing piers and foundation structure to meet the landscape, economic and environmental requirements.

[0005] The purpose of this utility model is achieved by the following technical solutions:

[0006] A bridge structure for the reconstruction of a double-track elevated section of rail transit with a newly added single-opening turnout includes several existing bridge piers for erecting existing lines, an existing line pedestal is provided below each of the existing line bridge piers, and an existing line pile foundation is provided below each of the existing line pedestals. The characteristic is that the reconstruction bridge structure includes a widened pedestal that matches each of the existing line pedestals, the widened pedestals are connected with the existing line pedestals to form a combined structure, a newly built pile foundation is provided below the widened pedestal, and a newly built turnout box girder and a newly built simply supported box girder are supported above the combined structure formed by the widened pedestal and the existing line pedestals, the newly built turnout box girder is used for erecting existing lines and single-opening turnouts, and the newly built simply supported box girder is used for connecting the turnouts.

[0007] The widened foundation is combined with the existing line foundation by planting reinforcement or drilling and tensioning prestressing.

[0008] According to the requirements of the new turnout box girder support points, new bridge piers are set on part of the widened abutments.

[0009] The existing bridge piers are provided with pad stones that match the reconstructed structure.

[0010] A force measuring and height-adjusting support is provided above the pad stone.

[0011] The advantages of this utility model are: it solves the problem of adding turnouts to the upper and lower parts of the bridge structure and the foundation design in the elevated section of urban rail transit, is feasible to construct, economical and reasonable, green and environmentally friendly, has good effects, and has great promotion and use value. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a plan view of the bridge structure after transformation according to the present utility model;

[0013] Figure 2 This is a plan view of the bridge structure before transformation in the present utility model;

[0014] Figure 3 This is a cross-sectional view of the utility model (at the location of the first bridge pier);

[0015] Figure 4 This is a cross-sectional view of the utility model (at the location of the second bridge pier);

[0016] Figure 5 This is a cross-sectional view of the present utility model (on the left side of the third pier);

[0017] Figure 6 This is a cross-sectional view of the present invention (on the right side of the third pier). DETAILED DESCRIPTION

[0018] The following is a further detailed description of the features of the present invention and other related features through embodiments in conjunction with the accompanying drawings to facilitate understanding by those skilled in the art:

[0019] like Figure 1-6 As shown in the figure, numbers 1-16 respectively represent: existing first line 1, existing second line 2, single turnout 3, existing line bridge pier 4, existing line pile foundation 5, existing line pedestal 6, new bridge pier 7, first type of joint widening pedestal 8, second type of joint widening pedestal 9, third type of joint widening pedestal 10, new pile foundation 11, new turnout box girder 12, new simply supported box girder 13, existing line simply supported box girder 14, pad stone 15, and support 16.

[0020] Example: Figures 1 to 6 As shown in the figure, in this embodiment, the double-track elevated section of rail transit is newly added with a single turnout to transform the bridge structure, which is used to solve the problem of newly added turnout connection and transformation in the elevated section of urban rail transit. Figure 1 As shown, the existing first line 1 and the existing second line 2 are the left and right lines of an existing double-track rail transit system, arranged in parallel. The newly constructed lines are connected to the track, and a single turnout 3 is added. The turnout model is selected based on the reconstruction requirements.

[0021] Combine Figures 1 to 2 As shown, in this embodiment, the existing line bridge structure includes an existing line bridge pier 4, an existing line pile foundation 5 and an existing line cap 6, wherein the existing line pile foundation 5 supports the existing line cap 6, the existing line cap 6 supports the existing line bridge pier 4, and an existing simply supported box girder 14 is supported above the existing line bridge pier 4.

[0022] like Figure 2 As shown, after adding a single turnout 3, the existing simply supported box girder 14 is replaced with a newly built turnout box girder 12. The newly built turnout box girder 12 is a prestressed concrete structure. In order to meet the bearing capacity requirements of the newly built turnout box girder 12, the existing line caps are reinforced and widened to cast the first type of widened caps 8, the second type of widened caps 9, and the third type of widened caps 10, and new pile foundations 11 are built. Among them, new piers 7 are built on the second widened caps 9 and the third widened caps 10 according to the support requirements of the newly built turnout box girder crossbeam 12 to support the newly built turnout box crossbeam 12. The first type of widened cap 8 is widened by embedding reinforcement, and the second widened caps 9 and the third widened caps 10 are combined with the new and old cap concrete by embedding reinforcement and drilling and tensioning prestressing the existing caps.

[0023] like Figure 1 and Figure 6 As shown, the newly built simply supported box girder 13 is used to connect the turnout, and the simply supported box girder 13 is partially cut near the edge of the first line side beam to form a special-shaped bridge structure to ensure the bridge plane layout requirements.

[0024] like Figures 3 to 5As shown, before beam replacement, the existing line piers were modified with stone pads 15. This modification was determined based on the track surface elevation, turnout beam height, pier top elevation, and support parameters. Force-sensing height adjustment was used for support 16, allowing for real-time operational monitoring of the modified bridge structure.

[0025] The newly built bridge piers 7 and the widened abutments and pile foundations in this embodiment can be constructed during daytime and nighttime window hours, and the newly built turnout box beams 12 can be prefabricated by high-position cast-in-situ beside the existing line, and the beams can be replaced and connected to the track when the rail transit is suspended.

[0026] Although the above embodiments have described the concepts and embodiments of the present invention in detail with reference to the accompanying drawings, ordinary technicians in this field can recognize that various improvements and modifications can still be made to the present invention without departing from the scope of the claims, so they are not described here one by one.

Claims

1. A bridge structure for retrofitting a double-track elevated section of rail transit with a newly added single-opening turnout, comprising a plurality of existing line bridge piers for bridging an existing line, each existing line bridge pier having an existing line cap disposed below it, each existing line cap having an existing line pile foundation disposed below it, characterized in that: The reconstructed bridge structure includes a widened pedestal that matches each of the existing line pedestals. The widened pedestals are connected to the existing line pedestals to form a combined structure. A new pile foundation is arranged below the widened pedestal. The combined structure formed by the widened pedestal and the existing line pedestals supports a new turnout box girder and a new simply supported box girder above. The new turnout box girder is used to erect existing lines and single turnouts, and the new simply supported box girder is used to connect the turnouts.

2. The bridge structure for the reconstruction of a double-track elevated section of rail transit with a newly added single-opening turnout according to claim 1 is characterized by: The widened foundation is combined with the existing line foundation by planting reinforcement or drilling and tensioning prestressing.

3. The bridge structure for the reconstruction of a double-track elevated section of rail transit with a newly added single-opening turnout according to claim 1 is characterized by: According to the requirements of the new turnout box girder support points, new bridge piers are set on part of the widened abutments.

4. The bridge structure for the reconstruction of a double-track elevated section of rail transit with a newly added single-opening turnout according to claim 1 is characterized by: The existing bridge piers are provided with pad stones that match the reconstructed structure.

5. The bridge structure for the reconstruction of a double-track elevated section of rail transit with a newly added single-opening turnout according to claim 4 is characterized by: A force measuring and height-adjusting support is provided above the pad stone.

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