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CN-121992709-A - Box type composite beam, box type composite beam construction method and large-span cable-stayed bridge

CN121992709ACN 121992709 ACN121992709 ACN 121992709ACN-121992709-A

Abstract

The invention discloses a box type composite beam, a box type composite beam construction method and a large-span cable-stayed bridge, and relates to the technical field of bridge construction, wherein the box type composite beam comprises a first bottom plate, a second bottom plate and a third bottom plate, wherein the first bottom plate is erected on a lower cross beam of a bridge tower of the large-span cable-stayed bridge; the bridge tower comprises a first bottom plate, a first top plate, a first web plate, prestressed steel pipe concrete, a first top plate, a first web plate and a prestressed steel pipe concrete, wherein the first top plate is arranged on one side, far away from a lower beam of a bridge tower, of the first bottom plate, the first web plate is arranged between the first top plate and the first bottom plate, two ends of the first web plate are respectively fixedly connected with the first top plate and the first web plate, the prestressed steel pipe concrete is arranged between the first top plate and the first bottom plate, and the prestressed steel pipe concrete is fixedly connected with the first top plate, the first bottom plate and the first web plate. According to the invention, the prestressed steel pipe concrete is arranged in the box-shaped combined beam erected on the lower cross beam of the bridge tower, and the transverse bending moment is resisted by the prestressed steel pipe concrete, so that the steel consumption of the box-shaped combined beam is reduced, and the engineering cost is reduced.

Inventors

  • HE WENTAO
  • Yuan Renan
  • CHEN YU
  • ZHANG ZHOU
  • LI SHIWEN
  • LI JIANGGANG
  • LI MING
  • LI LIN

Assignees

  • 中铁大桥勘测设计院集团有限公司

Dates

Publication Date
20260508
Application Date
20260209

Claims (10)

  1. 1. A box girder, characterized in that the box girder (1) comprises: The first bottom plate (13) is erected on a lower cross beam of a pylon of the large-span cable-stayed bridge; The first top plate (12) is arranged on one side of the first bottom plate (13) away from the lower beam of the bridge tower; the first web plate (14), the first web plate (14) is arranged between the first top plate (12) and the first bottom plate (13), and two ends of the first web plate (14) are fixedly connected with the first top plate (12) and the first web plate (14) respectively; The prestressed concrete filled steel tube (11), the prestressed concrete filled steel tube (11) is arranged between the first top plate (12) and the first bottom plate (13), and the prestressed concrete filled steel tube (11) is fixedly connected with the first top plate (12), the first bottom plate (13) and the first web (14).
  2. 2. A box girder according to claim 1, characterized in that the prestressed concrete filled steel tube (11) comprises: A first steel pipe (111); The shear connector (114) is fixedly arranged on the inner wall of the first steel pipe (111); a prestressed steel bundle (113), said prestressed steel bundle (113) being arranged inside said first steel pipe (111); -concrete (112), said concrete (112) being filled inside said first steel duct (111).
  3. 3. A box composite beam according to claim 1, comprising: the horizontal longitudinal partition plate (15), the horizontal longitudinal partition plate (15) is vertical to the first web plate (14), and two ends of the horizontal longitudinal partition plate are fixedly connected with the prestressed concrete filled steel tube (11) and the first web plate (14) respectively; The vertical longitudinal partition plate (16), the vertical longitudinal partition plate (16) is parallel to the first web plate (14), one end of the vertical longitudinal partition plate is fixedly connected with the prestressed concrete filled steel tube (11), and the other end of the vertical longitudinal partition plate is fixedly connected with the first bottom plate (13) or the first top plate (12).
  4. 4. A box composite beam according to claim 3, comprising: The transverse partition plate (17), transverse partition plate (17) with first roof (12), first bottom plate (13), first web (14), prestressed steel pipe concrete (11), horizontal longitudinal partition plate (15) vertical longitudinal partition plate (16) fixed connection.
  5. 5. A box girder construction method using the box girder according to any one of claims 1 to 4, comprising the steps of: S1, prefabricating multi-section prestressed steel pipe concrete (11); S2, erecting a first section box type combined beam (1) on a lower cross beam of a bridge tower of the large-span cable-stayed bridge; s3, placing the first-section precast prestressed steel pipe concrete (11) into a first-section box-type combined beam (1) erected on a lower cross beam of a bridge tower of the large-span cable-stayed bridge, tensioning a prestressed steel beam (113) in the first-section precast steel pipe concrete (11), and fixedly connecting the first-section precast steel pipe concrete (11) with the first-section box-type combined beam (1); S4, continuously erecting a next-section box-type combined beam (1), placing the next-section precast prestressed steel pipe concrete (11) into the next-section box-type combined beam (1), connecting one end of a prestressed steel beam (113) in the section precast prestressed steel pipe concrete (11) with one end of a prestressed steel beam (113) in the previous-section precast prestressed steel pipe concrete (11), tensioning the prestressed steel beam (113) in the section precast steel pipe concrete (11), and fixedly connecting the section precast steel pipe concrete (11) with the section box-type combined beam (1); s5, repeating the step S4 until the construction of the box type combined beam (1) is completed.
  6. 6. The method for constructing the box composite beam according to claim 5, wherein the prefabricated multi-section prestressed concrete filled steel tube (11) comprises the steps of: Welding a shear connector (114) on the inner wall of a first steel tube (111) of the prestressed steel tube concrete (11); -laying a pre-stressed steel strand (113) inside said first steel tube (111); And filling concrete (112) in the first steel pipe (111), temporarily stretching the prestressed steel bundles (113) at two ends of the prestressed steel bundles (113) until the concrete (112) filled in the first steel pipe (111) contracts and is slowly changed to a preset deformation amount, and stretching the prestressed steel bundles (113) to finish prefabrication.
  7. 7. A large span cable-stayed bridge using the box girder of any one of claims 1 to 4, further comprising: The transition steel box girders (2) are erected on two sides of the box-type combined girder (1); The steel box girder (3), steel box girder (3) erect transition steel box girder (2) is kept away from box composite beam (1) one side.
  8. 8. The large span cable-stayed bridge according to claim 7, further comprising: the bearing plate (4) is arranged between the box type combined beam (1) and the transition steel box beam (2), and two sides of the bearing plate (4) are fixedly connected with the box type combined beam (1) and the transition steel box beam (2) respectively.
  9. 9. A large span cable-stayed bridge according to claim 8, characterized in that said transition steel box girder (2) comprises: A second top plate (22); A second bottom plate (23), wherein the second bottom plate (23) is arranged on one side of the second top plate (22); The second web plate (24), the second web plate (24) is arranged between the second top plate (22) and the second bottom plate (23), and two ends of the second web plate are fixedly connected with the second top plate (22) and the second bottom plate (23) respectively; The horizontal stiffening ribs (25) are arranged among the second top plate (22), the second bottom plate (23) and the second web plate (24), and are fixedly connected with the second web plate (24) and the bearing plate (4) respectively; The vertical stiffening ribs (26) are arranged between the second top plate (22), the second bottom plate (23) and the second web plate (24), and the vertical stiffening ribs (26) are respectively fixedly connected with the second top plate (22), the second bottom plate (23) and the bearing plate (4).
  10. 10. A long span cable-stayed bridge according to claim 9, characterized in that said steel box girder (3) comprises: A third top plate (32); A third bottom plate (33), wherein the third bottom plate (33) is arranged at one side of the third top plate (32), and the third bottom plate (33) are connected into a whole; And the third web plate (34), wherein the third web plate (34) is arranged between the third top plate (32) and the third bottom plate (33), and two ends of the third web plate are fixedly connected with the third top plate (32) and the third bottom plate (33) respectively.

Description

Box type composite beam, box type composite beam construction method and large-span cable-stayed bridge Technical Field The invention relates to the technical field of bridge construction, in particular to a box type composite beam, a box type composite beam construction method and a large-span cable-stayed bridge. Background Along with the continuous improvement of the interconnection and intercommunication demands of the landing sea traffic network, the application of the cross-sea bridge is increasingly wide. The main bridge of the navigation hole needs to meet the passing requirement of large ships, a large-span structural design is often adopted, and the bridge of a cable bearing system (such as a suspension bridge and a cable-stayed bridge) has become the main flow type of the main bridge of the navigation hole in the sea area by virtue of excellent large-span spanning capability. However, the main span of the navigation Kong Zhuqiao in the sea area reaches 2000m, under the action of constant load, the main girder of the bridge tower area is subjected to huge axial force, and the wind load is obviously higher than that of the bridge in the land area because the sea area is subjected to extreme wind conditions such as high wind speed, strong gusts, typhoons and the like all the year round, so that the main girder also needs to bear huge transverse bending moment in the bridge tower area. In order to resist transverse bending moment, the steel consumption of the box-shaped combined beam at the lower cross beam of the bridge tower needs to be increased, and therefore engineering cost is increased. Disclosure of Invention The invention provides a box type composite beam, a box type composite beam construction method and a large-span cable-stayed bridge, which can solve the problem that in order to resist transverse bending moment, the steel consumption of the box type composite beam at the lower beam of a bridge tower needs to be increased, and the engineering cost is increased. In a first aspect, an embodiment of the present invention provides a box composite beam, including: The first bottom plate is erected on a lower cross beam of a pylon of the large-span cable-stayed bridge; The first top plate is arranged on one side, far away from the lower beam of the bridge tower, of the first bottom plate; the first web plate is arranged between the first top plate and the first bottom plate, and two ends of the first web plate are respectively fixedly connected with the first top plate and the first web plate; the prestressed steel pipe concrete is arranged between the first top plate and the first bottom plate, and is fixedly connected with the first top plate, the first bottom plate and the first web plate. With reference to the first aspect, in one embodiment, the prestressed concrete-filled steel tube includes: A first steel pipe; The shear connector is fixedly arranged on the inner wall of the first steel pipe; The prestress steel beam is arranged inside the first steel pipe; and the concrete is filled in the first steel pipe. With reference to the first aspect, in one embodiment, the method includes: The horizontal longitudinal partition plate is perpendicular to the first web plate, and two ends of the horizontal longitudinal partition plate are fixedly connected with the prestressed concrete filled steel tube and the first web plate respectively; the vertical longitudinal partition plate is parallel to the first web plate, one end of the vertical longitudinal partition plate is fixedly connected with the prestressed concrete filled steel tube, and the other end of the vertical longitudinal partition plate is fixedly connected with the first bottom plate or the first top plate. With reference to the first aspect, in one embodiment, the method includes: and the diaphragm plate is fixedly connected with the first top plate, the first bottom plate, the first web plate, the prestressed steel pipe concrete, the horizontal longitudinal partition plate and the vertical longitudinal partition plate. In a second aspect, an embodiment of the present invention provides a method for constructing a box-type composite beam, using the box-type composite beam, including the steps of: s1, prefabricating multi-section prestressed steel pipe concrete; S2, erecting a first section box type combined beam on a lower cross beam of a bridge tower of the large-span cable-stayed bridge; S3, placing the first-section precast prestressed steel pipe concrete into a first-section box-type combined beam erected on a lower beam of a bridge tower of the large-span cable-stayed bridge, tensioning a prestressed steel beam in the first-section precast steel pipe concrete, and fixedly connecting the first-section precast steel pipe concrete with the first-section box-type combined beam; S4, continuously erecting a next-section box-type combined beam, placing the next-section precast prestressed steel pipe concrete into the next-section box