Railway assembled steel diagonal brace composite PC beam and construction method thereof

Abstract

The present invention relates to a railway assembled steel diagonal brace composite PC beam and a construction method thereof, wherein the assembled structure comprises a prestressed concrete box beam, a prestressed concrete box beam cantilever flange and a steel diagonal brace, wherein the prestressed concrete box beam cantilever flange is connected to the transverse outer end of the prestressed concrete box beam top plate through a steel bar, and the joint is a transverse splicing surface; the cantilever flanges of the prestressed concrete box beams of multiple sections and each section of the prestressed concrete box beams are longitudinally connected through steel bars, and the joint is a longitudinal splicing surface; the upper end of the steel diagonal brace is fixed to the transverse outer end of the cantilever flange of the prestressed concrete box beam, and the lower end of the steel diagonal brace is fixed to the transverse outer end of the bottom plate of the prestressed concrete box beam. The advantages of the prestressed concrete structure and the steel structure are fully utilized, the appearance is beautiful, the force is clear, and the prefabricated assembled construction can be carried out, which has significant economic benefits and has broad application prospects in the field of bridges.

Description

Technical Field

[0001] The invention relates to the technical field of bridge construction, and in particular to a railway assembled steel diagonal brace combined PC beam and a construction method thereof. Background Art

[0002] As the task of railway construction becomes increasingly arduous, the traditional prefabricated double-track standard span simply supported beam can no longer meet the requirements of bridge selection at all bridge locations. For multi-track bridges, the bridge width is relatively large, and the hoisting capacity required for prefabrication is relatively high. In addition, the span of multi-track bridges is generally small, and the economic benefits are poor. If cast-in-place support is used, the construction risk is relatively high when the bridge is at a higher position or crosses a river, and the construction period is relatively long.

[0003] To address the above problems, the use of a steel box girder structure can reduce the upper load on the bridge, reduce the workload of on-site bridge construction, and shorten the construction period. However, for bridges with strict stiffness requirements, the wider steel box girder has a smaller lateral stiffness and the lateral overturning problem is more prominent.

[0004] Therefore, it has become an urgent problem to study a bridge that is suitable for multi-line railways (wider bridge width), has a large spanning capacity, has a beautiful structural appearance, and can be prefabricated and assembled in segments. Summary of the invention

[0005] The purpose of the present invention is to provide a railway assembled steel diagonal brace combined PC beam and a construction method thereof, which can fully utilize the advantages of prestressed concrete structure and steel structure, solve the problems of the prior art, have a light structure and are easy to construct.

[0006] The technical solution adopted by the present invention is:

[0007] Railway assembled steel diagonal brace composite PC beam, characterized by:

[0008] The railway assembled steel diagonal brace composite PC beam is an assembled structure, including a prestressed concrete box beam, a prestressed concrete box beam cantilever flange and a steel diagonal brace;

[0009] The prestressed concrete box girder includes a prestressed concrete box girder top plate, a prestressed concrete box girder bottom plate, a prestressed concrete box girder middle web plate and a prestressed concrete box girder outer web plate. The cantilevered flange of the prestressed concrete box girder is connected to the transverse outer end of the prestressed concrete box girder top plate through steel bars, and the joint is a transverse splicing surface; the cantilevered flanges of the prestressed concrete box girders of multiple sections and each section of the prestressed concrete box girder are longitudinally connected through steel bars, and the joint is a longitudinal splicing surface;

[0010] The upper end of the steel diagonal brace is fixed to the transverse outer end of the cantilever flange of the prestressed concrete box girder, and the lower end of the steel diagonal brace is fixed to the transverse outer end of the bottom plate of the prestressed concrete box girder. The steel diagonal brace is arranged at intervals along the longitudinal direction and is bilaterally symmetrical.

[0011] An anchor beam is arranged at the entire length of the transverse outer end of the cantilever flange of the prestressed concrete box girder. The anchor beam is connected to the cantilever flange of the prestressed concrete box girder through steel bars, and the upper end of the steel diagonal brace is fixed to the anchor beam through an anchor.

[0012] The anchor beams are arranged symmetrically along the center line of the prestressed concrete box girder.

[0013] Anchor blocks are arranged at both transverse ends of the bottom plate of the prestressed concrete box girder, the anchor blocks are arranged at intervals in the longitudinal direction, and the anchor blocks are connected to the bottom plate of the prestressed concrete box girder through steel bars;

[0014] The lower end of the steel diagonal brace is fixed to the anchor block through an anchor.

[0015] The anchor blocks are arranged symmetrically along the center line of the prestressed concrete box girder.

[0016] The steel diagonal brace is one of section steel, square steel pipe, round steel pipe and steel tube concrete.

[0017] The anchoring piece comprises a stiffening plate and an end anchor plate. The end anchor plate is welded and fixed to the end of the steel diagonal brace. The stiffening plate is vertically welded and fixed to the outer periphery of the end of the steel diagonal brace and the end anchor plate.

[0018] The anchor beam and the anchor block are provided with embedded parts corresponding to the anchor pieces, the embedded parts include anchor bars and embedded steel plates, the anchor bars are prefabricated in the anchor beam and the anchor block, the embedded steel plates are consolidated with the anchor bars and are located on the end faces of the anchor beam and the anchor block;

[0019] The end anchor plate of the anchor is fixed to the embedded steel plate of the embedded part.

[0020] A serrated connection key is provided at the transverse splicing surface, and epoxy resin glue is applied to the transverse splicing surface during transverse splicing;

[0021] A serrated connection key is arranged at the longitudinal splicing surface, and epoxy resin glue is coated on the longitudinal splicing surface during longitudinal splicing.

[0022] The construction method of railway assembled steel diagonal brace combined PC beam is characterized by:

[0023] The following steps are involved:

[0024] Step 1: Prefabricate the cantilever flange of the prestressed concrete box girder with anchor block and the prestressed concrete box girder with anchor beam according to the design requirements, and process the steel diagonal brace, anchor bars and embedded steel plates of the embedded parts, and the stiffening plates and end anchor plates of the anchor parts; connect the anchor bars and embedded steel plates into a whole and then embed them in the designed positions of the anchor beam and anchor block, and connect the steel diagonal brace, stiffening plates and end anchor plates into a whole according to the designed connection method;

[0025] Step 2: Use a bridge erection machine to hoist each prefabricated component to the designed position of the bridge;

[0026] Step 3: Apply epoxy resin glue on the horizontal joint surface;

[0027] Step 4: Install the steel diagonal brace on the bridge erecting machine, and connect the anchor pieces at the ends of the steel diagonal brace with the anchor beam and the embedded parts in the anchor block;

[0028] Step 5: tensioning the transverse prestress, connecting the transverse components to form a longitudinal spliced ​​beam section;

[0029] Step 6: Repeat steps 2 to 5 to form all longitudinal splicing sections of the whole-hole beam;

[0030] Step 7: Apply epoxy resin glue to the longitudinal joint surface;

[0031] Step 8: Tension the longitudinal prestressed steel strands of the entire bridge according to design requirements to form a composite PC beam with steel diagonal braces.

[0032] The present invention has the following advantages:

[0033] The present invention adopts steel diagonal braces to adapt to the increase in the design width of the bridge. Compared with the traditional single-box multi-chamber box girder bridge, the material consumption of the upper and lower structures of the bridge is reduced, and compared with the steel box girder bridge, it has better structural rigidity and stability; the various components of the beam body are prefabricated in the factory, transported and hoisted to the site for splicing into a whole, the construction quality is improved, the construction period is optimized, and it has a beautiful appearance, with significant economic benefits, and has broad application prospects in the field of bridges. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic diagram of the elevation structure of the railway assembled steel diagonal brace composite PC beam along the beam length direction of the present invention.

[0035] Figure 2 It is a schematic diagram of the cross-sectional structure of the railway assembled steel diagonal brace combined PC beam of the present invention.

[0036] Figure 3 for Figure 1 , Figure 2 Schematic diagram of the Sinosteel diagonal brace anchor structure.

[0037] Figure 4 for Figure 1 , Figure 2 Schematic diagram of the embedded parts of the Sinosteel diagonal brace.

[0038] In the figure, 1 is prestressed concrete box girder, 1-1 is prestressed concrete box girder top plate, 1-2 is prestressed concrete box girder bottom plate, 1-3 is prestressed concrete box girder middle web plate, 1-4 is prestressed concrete box girder outer web plate, 2 is prestressed concrete box girder cantilever flange, 3 is anchor beam, 4 is steel diagonal brace, 5 is anchor block, 6 is embedded part, 6-1 is anchor bar, 6-2 is embedded steel plate, 7 is anchor part, 7-1 is stiffening plate, 7-2 is end anchor plate, 8 is transverse splicing surface, 9 is longitudinal splicing surface. DETAILED DESCRIPTION

[0039] The present invention is described in detail below in conjunction with specific implementation modes.

[0040] The present invention relates to a railway assembled steel diagonal brace composite PC beam, which is an assembled structure, comprising a prestressed concrete box beam 1, a prestressed concrete box beam cantilever flange 2 and a steel diagonal brace 4. The prestressed concrete box beam 1 comprises a prestressed concrete box beam top plate 1-1, a prestressed concrete box beam bottom plate 1-2, a prestressed concrete box beam middle web 1-3 and a prestressed concrete box beam outer web 1-4. The prestressed concrete box beam cantilever flange 2 is connected to the transverse outer end of the prestressed concrete box beam top plate 1-1 through steel bars, and the connection is a transverse splicing surface 8; the multi-section prestressed concrete box beam 1 and the prestressed concrete box beam cantilever flange 2 of each section of the prestressed concrete box beam 1 are longitudinally connected through steel bars, and the connection is a longitudinal splicing surface 9. The upper end of the steel diagonal brace 4 is fixed to the transverse outer end of the prestressed concrete box beam cantilever flange 2, and the lower end of the steel diagonal brace 4 is fixed to the transverse outer end of the prestressed concrete box beam bottom plate 1-2. The steel diagonal brace 4 is arranged at intervals in the longitudinal direction and is bilaterally symmetrical.

[0041] An anchor beam 3 is arranged at the transverse outer end of the cantilever flange 2 of the prestressed concrete box girder through the entire length, the anchor beam 3 is connected to the cantilever flange 2 of the prestressed concrete box girder through steel bars, and the upper end of the steel diagonal brace 4 is fixed to the anchor beam 3 through an anchor 7. The anchor beam 3 is arranged symmetrically along the center line of the prestressed concrete box girder 1.

[0042] Anchor blocks 5 are provided at both transverse ends of the prestressed concrete box girder bottom plate 1-2, and the anchor blocks 5 are arranged at intervals in the longitudinal direction. The anchor blocks 5 are connected to the prestressed concrete box girder bottom plate 1-2 through steel bars; the lower ends of the steel diagonal braces 3 are fixed to the anchor blocks 4 through anchor pieces 5. The anchor blocks 5 are arranged symmetrically along the center line of the prestressed concrete box girder 1.

[0043] The steel diagonal brace 4 is one of section steel, square steel tube, round steel tube and steel tube concrete. The anchor 7 includes a stiffening plate 7-1 and an end anchor plate 7-2. The end anchor plate 7-2 is welded and fixed to the end of the steel diagonal brace 4. The stiffening plate 7-1 is vertically welded and fixed to the outer periphery of the end of the steel diagonal brace 4 and the end anchor plate 7-2. The anchor beam 3 and the anchor block 5 are provided with embedded parts 6 corresponding to the anchor 7. The embedded parts 6 include anchor bars 6-1 and embedded steel plates 6-2. The anchor bars 6-1 are prefabricated in the anchor beam 3 and the anchor block 5. The embedded steel plates 6-2 are fixed to the anchor bars 6-1 and are located on the end faces of the anchor beam 3 and the anchor block 5. The end anchor plate 7-2 of the anchor 7 is fixed to the embedded steel plate 6-2 of the embedded part 6 by bolts.

[0044] The transverse splicing surface 8 is provided with a serrated connection key, and the transverse splicing surface 8 is coated with epoxy resin glue during transverse splicing; the longitudinal splicing surface 9 is provided with a serrated connection key, and the longitudinal splicing surface 9 is coated with epoxy resin glue during longitudinal splicing.

[0045] The construction method of the railway assembled steel diagonal brace combined PC beam is characterized by:

[0046] The following steps are involved:

[0047] Step 1: prefabricate the prestressed concrete box girder 1 with the anchor block 5 and the cantilever flange 2 of the prestressed concrete box girder with the anchor beam 3 according to the design requirements, and process the steel diagonal brace 4, the anchor bar 6-1 and the embedded steel plate 6-2 of the embedded part 6, and the stiffening plate 7-1 and the end anchor plate 7-2 of the anchor member 7; connect the anchor bar 6-1 and the embedded steel plate 6-2 into a whole, and then embed them at the designed position of the anchor beam 3 and the anchor block 5, and connect the steel diagonal brace 4, the stiffening plate 7-1 and the end anchor plate 7-2 into a whole according to the designed connection method;

[0048] Step 2: Use a bridge erection machine to hoist each prefabricated component to the designed position of the bridge;

[0049] Step 3: Apply epoxy resin glue on the horizontal joint surface 8;

[0050] Step 4: Install the steel diagonal brace 4 on the bridge erecting machine, and connect the anchor piece 7 at the end of the steel diagonal brace 4 to the anchor beam 3 and the embedded part 6 in the anchor block 4;

[0051] Step 5: tensioning the transverse prestress, connecting the transverse components to form a longitudinal spliced ​​beam section;

[0052] Step 6: Repeat steps 2 to 5 to form all longitudinal splicing sections of the whole-hole beam;

[0053] Step 7: Apply epoxy resin glue to the longitudinal joint surface 9;

[0054] Step 8: Tension the longitudinal prestressed steel strands of the entire bridge according to design requirements to form a composite PC beam with steel diagonal braces.

[0055] The railway assembled steel diagonal brace composite PC beam and the construction method thereof described in the present invention fully utilize the advantages of prestressed concrete structure and steel structure, have beautiful appearance, clear force, can be prefabricated and assembled, have significant economic benefits, and have broad application prospects in the field of bridges.

[0056] The content of the present invention is not limited to the embodiments listed, and any equivalent changes made to the technical solution of the present invention by ordinary technicians in this field after reading the description of the present invention are covered by the claims of the present invention.

Claims

1. The construction method of railway assembled steel diagonal brace combined PC beam is characterized by: The railway assembled steel diagonal brace composite PC beam is an assembled structure, comprising a prestressed concrete box beam (1), a prestressed concrete box beam cantilever flange (2) and a steel diagonal brace (4); The prestressed concrete box girder (1) comprises a prestressed concrete box girder top plate (1-1), a prestressed concrete box girder bottom plate (1-2), a prestressed concrete box girder middle web plate (1-3) and a prestressed concrete box girder outer web plate (1-4); the prestressed concrete box girder cantilever flange (2) is connected to the transverse outer end of the prestressed concrete box girder top plate (1-1) through steel bars, and the connection is a transverse splicing surface (8); the prestressed concrete box girder cantilever flanges (2) of the multiple-section prestressed concrete box girder (1) and each section of the prestressed concrete box girder (1) are longitudinally connected through steel bars, and the connection is a longitudinal splicing surface (9); The upper end of the steel diagonal brace (4) is fixed to the transverse outer end of the cantilever flange (2) of the prestressed concrete box beam, and the lower end of the steel diagonal brace (4) is fixed to the transverse outer end of the bottom plate (1-2) of the prestressed concrete box beam. The steel diagonal brace (4) is arranged at intervals in the longitudinal direction and is bilaterally symmetrical. An anchor beam (3) is arranged at the transverse outer end of the cantilever flange (2) of the prestressed concrete box beam, the anchor beam (3) is connected to the cantilever flange (2) of the prestressed concrete box beam through steel bars, and the upper end of the steel diagonal brace (4) is fixed to the anchor beam (3) through an anchor piece (7); The anchor beam (3) and the anchor block (5) are provided with embedded parts (6) corresponding to the anchor pieces (7), the embedded parts (6) comprising anchor bars (6-1) and embedded steel plates (6-2), the anchor bars (6-1) being prefabricated in the anchor beam (3) and the anchor block (5), and the embedded steel plates (6-2) being fixed to the anchor bars (6-1) and being located on the end faces of the anchor beam (3) and the anchor block (5); The end anchor plate (7-2) of the anchor member (7) is fixed to the embedded steel plate (6-2) of the embedded member (6); The construction method comprises the following steps: Step 1: prefabricate a prestressed concrete box girder (1) with an anchor block (5) and a cantilever flange (2) of a prestressed concrete box girder with an anchor beam (3) according to design requirements, and process the steel diagonal brace (4), the anchor bar (6-1) and the embedded steel plate (6-2) of the embedded part (6), and the stiffening plate (7-1) and the end anchor plate (7-2) of the anchor member (7); connect the anchor bar (6-1) and the embedded steel plate (6-2) into a whole, and then embed them in the designed positions of the anchor beam (3) and the anchor block (5), and connect the steel diagonal brace (4), the stiffening plate (7-1) and the end anchor plate (7-2) into a whole according to the designed connection method; Step 2: Use a bridge erection machine to hoist each prefabricated component to the designed position of the bridge; Step 3: Apply epoxy resin glue to the transverse joint surface (8); Step 4: Install the steel diagonal brace (4) on the bridge erection machine, and connect the anchor piece (7) at the end of the steel diagonal brace (4) to the anchor beam (3) and the embedded part (6) in the anchor block (5); Step 5: tensioning the transverse prestress, connecting the transverse components to form a longitudinal spliced ​​beam section; Step 6: Repeat steps 2 to 5 to form all longitudinal splicing sections of the whole-hole beam; Step 7: Apply epoxy resin glue to the longitudinal joint surface (9); Step 8: Tension the longitudinal prestressed steel strands of the entire bridge according to design requirements to form a composite PC beam with steel diagonal braces.

2. The construction method of railway assembled steel diagonal brace composite PC beam according to claim 1 is characterized by: The anchor beams (3) are symmetrically arranged along the center line of the prestressed concrete box beam (1).

3. The construction method of railway assembled steel diagonal brace composite PC beam according to claim 2 is characterized by: Anchor blocks (5) are arranged at both transverse ends of the prestressed concrete box girder bottom plate (1-2), the anchor blocks (5) are arranged at intervals in the longitudinal direction, and the anchor blocks (5) are connected to the prestressed concrete box girder bottom plate (1-2) through steel bars; The lower end of the steel diagonal brace (4) is fixed to the anchor block (5) via an anchor piece (7).

4. The construction method of railway assembled steel diagonal brace composite PC beam according to claim 3 is characterized by: The anchor blocks (5) are symmetrically arranged along the center line of the prestressed concrete box girder (1).

5. The construction method of railway assembled steel diagonal brace composite PC beam according to claim 4 is characterized by: The steel diagonal brace (4) is one of a section steel, a square steel tube, a round steel tube, and a steel tube concrete.

6. The construction method of railway assembled steel diagonal brace composite PC beam according to claim 5, characterized in that: The anchor member (7) comprises a stiffening plate (7-1) and an end anchor plate (7-2), the end anchor plate (7-2) being welded and fixed to the end of the steel diagonal brace (4), and the stiffening plate (7-1) being vertically welded and fixed to the outer periphery of the end of the steel diagonal brace (4) and the end anchor plate (7-2).

7. The construction method of railway assembled steel diagonal brace composite PC beam according to claim 6, characterized in that: A serrated connection key is provided at the transverse splicing surface (8), and during transverse splicing, the transverse splicing surface (8) is coated with epoxy resin glue; A serrated connection key is provided at the longitudinal splicing surface (9), and epoxy resin glue is applied to the longitudinal splicing surface (9) during longitudinal splicing.

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