Rail transit elevated bridge structure capable of canceling turnout junction and being close to added line

Abstract

The invention relates to the field of reconstruction and expansion of existing elevated rail transit, in particular to a rail transit elevated track switch connection canceling and adjacent line adding reconstruction bridge structure which comprises a newly-built turnout beam and a newly-built simply supported beam. A newly-built bearing platform is arranged on the side, corresponding to the newly-built simply supported beam, of the existing pier, a newly-built pile foundation is arranged below the newly-built bearing platform, a newly-built pier is arranged above the newly-built bearing platform, and the newly-built simply supported beam is supported on the newly-built pier and partially supported on the existing pier. The method has the advantages that when the single turnout is removed from the double-line-to-four-line bridge and line adding transformation is carried out, the original turnout beam is replaced by the new turnout beam, the special-shaped bridge piers are adopted to support the simply supported beam structure adjacent to the newly-added elevated line, the new bridge structure and the old bridge structure are separated, stress is clear, construction is convenient, and the effect is good; by means of the structural form, important innovation is made for canceling connecting rails on the bridge and building a close line adding reconstruction project.

Description

Technical Field

[0001] The present invention relates to the field of reconstruction and expansion of existing elevated rail transit, and in particular to a bridge structure of an elevated rail transit that cancels turnout connection and is adjacent to line addition. Background Art

[0002] Shanghai Metro Line 3 is the first elevated rail transit line in Shanghai. It operates on the same line as Shanghai Metro Loop Line 4 from Baoshan Road Station to Hongqiao Road Station. Line 4 is connected to Line 3 by a simple connection. Since the outer circle connection line of Line 4 needs to cross the main line of Line 3, a large downhill slope of 21.3‰ is adopted. In order to avoid collision in the event of a brake failure, the signal system here has adopted a special design. At the same time, the simple connection has no parallel approach, which does not meet the requirements of the current specifications and poses a safety hazard. In order to achieve parallel access and eliminate the bottleneck of large ramp connection, a new outer circle line of Line 4 is built on the north side of the existing Baoshan Road Station, which is about 0.5km long. The outer circle of Line 4 and the down line of Line 3 will be replaced by a connection after the station instead of the connection before the station.

[0003] The inner and outer circles of Line 4 are connected to the upper and lower lines of Line 3, and the double-track to four-track turnout beam structure is adopted. According to the reconstruction requirements, the left turnout of Line 3 is cancelled, and a new track is built nearby. The new line must meet the limit and bridge deck limit requirements. There are cases of widening and reinforcing bridge decks on highway municipal bridges, but in order not to affect the operation of rail transit and affected by the straight and curved elements of the line and the seamless track connection, widening the bridge deck often causes the problem of uncoordinated force between the new and old structures. Consider using the Spring Festival suspension period to replace the double-track to four-track turnout beam as a whole with a bridge structure with a wider bridge deck to meet the requirements of multi-line parallel operation. However, the bridge deck limit and load have increased, and the existing bridge piers and foundations can no longer meet the bearing capacity requirements after the reconstruction. Large-scale reinforcement and reconstruction of the bridge substructure is required, which poses a safety risk. Summary of the invention

[0004] The purpose of the present invention is to provide a rail transit elevated bridge structure that eliminates the switch connection and is adjacent to the line addition and reconstruction based on the above-mentioned deficiencies in the prior art, replaces the original double-track to four-track switch continuous beam with a double-track to three-track switch continuous beam, and supports and juxtaposes simply supported beams through newly built special-shaped piers, and separates the new and old bridge structures to achieve the effect of eliminating the parallel connection of multiple switch lines, avoid large-scale overhaul and reinforcement of the old structure, and reduce the impact on the operating rail transit and construction risks.

[0005] The purpose of the present invention is achieved by the following technical solutions: A rail transit elevated bridge structure that cancels turnout connection and is adjacent to line addition and reconstruction includes a plurality of existing piers for erecting existing lines, an existing line pedestal is provided below each of the existing line piers, and an existing line pile foundation is provided below each of the existing line pedestals. It is characterized in that the reconstruction bridge structure includes a newly built turnout beam and a newly built simply supported beam, wherein the newly built turnout beam is supported on the existing piers, a newly built pedestal is provided on one side of the existing pier corresponding to the newly built simply supported beam, a newly built pile foundation is provided below the newly built pedestal, a newly built pier is provided above the newly built pedestal, and the newly built simply supported beam is supported on the newly built piers and partially supported on the existing piers.

[0006] The newly-built simply-supported beam is designed according to the bridge deck layout and building connection requirements.

[0007] The newly built bridge pier adopts an inverted L-shaped pier structure.

[0008] The newly built foundation adopts a U-shaped structure, and its U-shaped opening surrounds the corresponding existing foundation.

[0009] The newly built turnout beam is a concrete structure or a steel structure, and its beam edge line is planned according to the bridge deck system layout. The support of the newly built turnout beam adopts a spherical steel support.

[0010] The advantages of the present invention are as follows: when a single turnout is removed on a double-track to four-track bridge and a line is added, the original turnout beam is replaced with a new turnout beam, and a simply supported beam structure supported by a special-shaped pier is adopted adjacent to the newly added elevated line, so that the new and old bridge structures are separated, the force is clear, the construction is convenient, and the effect is good. The use of this structural form to achieve the cancellation of track connection on the bridge and the construction of the adjacent line addition and reconstruction project has made important innovations. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a plan view of the bridge structure after transformation of the present invention; Figure 2 It is a plan view of the bridge structure before transformation of the present invention; Figure 3 It is a cross-sectional view of the present invention (at the location of the first bridge pier); Figure 4 It is a cross-sectional view of the present invention (at the second bridge pier location); Figure 5 It is a cross-sectional view of the present invention (at the location of the third bridge pier); Figure 6 It is a cross-sectional view of the present invention (at the fourth pier position). DETAILED DESCRIPTION

[0012] The features of the present invention and other related features are further described in detail below through embodiments in conjunction with the accompanying drawings to facilitate understanding by those skilled in the art: like Figure 1-6 As shown, numbers 1-21 in the figure respectively represent: existing first line 1, existing second line 2, first turnout 3, second turnout 4, newly built line 5, existing line abutment 6, existing line bridge pier 7, existing line pile foundation 8, existing line turnout beam 9, newly built bridge pier 10, newly built bridge pier 11, newly built bridge pier 12, newly built abutment 13, newly built abutment 14, newly built abutment 15, newly built simply supported beam 16, newly built simply supported beam 17, newly built simply supported beam 18, newly built turnout beam 19, existing cushion stone 20, and support 21.

[0013] Example: Figures 1 to 6 As shown, the rail transit elevated section in this embodiment cancels the track connection and reconstructs the bridge structure adjacent to the additional line, which is used to solve the problem of canceling the turnout track connection and reconstructing the adjacent bridge structure adjacent to the additional line of urban rail transit elevated section. Figure 1 As shown, the existing first line 1 and the existing second line 2 are the left and right lines of the existing double-track main line of rail transit, and the two are arranged in parallel. The first turnout 3 and the second turnout 4 are the left turnout of the existing first line 1 and the right turnout of the existing second line 2, respectively. The main line and the turnout are arranged on the existing line turnout beam 9. The existing line bridge pier 6, the existing line cap 7, and the existing line pile foundation 8 are arranged at the lower part of the existing line turnout beam 9.

[0014] Combination Figure 1 to Figure 2 As shown, in this embodiment, the first switch 3 is cancelled according to the transformation needs, and a new line 5 is added near the main line to connect the track and operate in parallel.

[0015] like Figures 2 to 6 As shown, the first turnout 3 is cancelled and the turnout beam 9 of the existing line is replaced with a newly built turnout beam 19 for changing the double-line to three-line. The newly built line 5 is connected to the outer ring line in the vicinity of the new addition, and the newly built line 5 is arranged on the newly built simply supported beam 16, the newly built simply supported beam 17 and the newly built simply supported beam 18. The newly built simply supported beam 16, the newly built simply supported beam 17 and the newly built simply supported beam 18 adopt a special-shaped bridge structure to realize the structural juxtaposition with the newly built turnout beam 19. The newly built simply supported beam 16, the newly built simply supported beam 17 and the newly built simply supported beam 18 can be designed according to the bridge deck layout and the building limit requirements. The newly built bridge piers 11 and the newly built bridge piers 12 adopt an inverted L-shaped bridge pier structure, and the cap beam can be a prestressed concrete structure. The newly built abutments 14 and the newly built abutments 15 adopt a U-shaped structure to realize eccentric bearing and meet the lateral stiffness requirements of the bridge piers.

[0016] In this embodiment, one side of the newly built turnout beam 19 and the newly built simply supported beam 18 is supported on the existing bridge pier 6, while the newly built simply supported beam 16 and the newly built simply supported beam 17 are supported as a whole on the newly built bridge pier 10 and the newly built bridge pier 11. The existing line pier 6, the existing line cap 7, and the existing line pile foundation 8 can be combined with the support reaction of the newly built turnout beam 19 to determine whether they need to be widened and reinforced. The existing cushion stone 20 on the existing bridge pier 6 is modified in combination with the structural height and support reaction of the newly built line 5, the newly built turnout beam 19, and the newly built simply supported beam 18.

[0017] In this embodiment, the new line 5 can determine the plane position in combination with the turnout parameters and line elements of the first turnout 3. The new turnout beam 19 can be a concrete structure or a steel structure. The beam edge line is planned according to the bridge deck system layout, and the bearing 21 can adopt a spherical steel bearing.

[0018] In this embodiment, all special-shaped bridge structures can be constructed by cast-in-place, and beam replacement, turnout removal and track connection can be carried out during the rail transit suspension period.

[0019] Although the above embodiments have described in detail the concepts and embodiments of the present invention with reference to the accompanying drawings, ordinary technicians in this field can recognize that various improvements and changes can still be made to the present invention without departing from the scope of the claims, so they are not described one by one here.

Claims

1. A rail transit elevated bridge structure that cancels turnout connection and is adjacent to line addition and reconstruction, comprising a plurality of existing bridge piers for erecting existing lines, each of which is provided with an existing line cap below the existing line bridge pier, and each of which is provided with an existing line pile foundation below the existing line cap, characterized in that: The reconstructed bridge structure includes a newly built turnout beam and a newly built simply supported beam, wherein the newly built turnout beam is supported on the existing bridge pier, a newly built pedestal is arranged on one side of the existing bridge pier corresponding to the newly built simply supported beam, a newly built pile foundation is arranged below the newly built pedestal, a newly built bridge pier is arranged above the newly built pedestal, and the newly built simply supported beam is supported on the newly built pier and partially supported on the existing pier.

2. According to claim 1, a rail transit elevated bridge structure with turnout cancellation and track addition and adjacent line reconstruction is characterized by: The newly-built simply-supported beam is designed according to the bridge deck layout and building connection requirements.

3. According to claim 1, a rail transit elevated bridge structure with no turnout connection and adjacent line addition and reconstruction is characterized by: The newly built bridge pier adopts an inverted L-shaped bridge pier structure.

4. According to claim 1, a rail transit elevated bridge structure with no turnout connection and adjacent line addition and reconstruction is characterized by: The newly built foundation adopts a U-shaped structure, and its U-shaped opening surrounds the corresponding existing foundation.

5. According to claim 1, a rail transit elevated bridge structure with no turnout connection and adjacent line addition and reconstruction is characterized by: The newly built turnout beam is a concrete structure or a steel structure, and its beam edge line is planned according to the bridge deck system layout. The support of the newly built turnout beam adopts a spherical steel support.

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