A side span consolidation-tower beam semi-floating hybrid system concrete beam cable-stayed bridge

Abstract

The present invention belongs to the technical field of concrete beam bridge construction, and specifically relates to a side span consolidation-tower beam semi-floating hybrid system concrete beam cable-stayed bridge, comprising a bridge tower, a cable-stayed cable, a stiffening beam, and two groups of side span piers located at both ends of the stiffening beam; each group of side span piers includes at least one side span pier; a support is provided on the bridge tower, and the middle part of the stiffening beam is supported on the support; the two ends of the stiffening beam are respectively supported on the two groups of side span piers, and at least one side span pier in each group of side span piers is consolidated with the stiffening beam; a cable-stayed cable is provided between the bridge tower and the stiffening beam, and the two ends of the cable-stayed cable are respectively connected to the bridge tower and the stiffening beam. The present invention adopts a side span consolidation-tower beam semi-floating hybrid system formed by consolidating the side span pier and the stiffening beam, and arranging a support on the bridge tower to support the stiffening beam, and improves the force performance and vertical residual creep deformation of the stiffening beam through the flexible constraint of the side span pier on the stiffening beam, so as to meet the railway driving requirements.

Description

Technical Field

[0001] The invention belongs to the technical field of concrete beam bridge construction, and in particular relates to a side span consolidation-tower beam semi-floating mixed system concrete beam cable-stayed bridge. Background Art

[0002] Concrete beam cable-stayed bridges are widely used in bridge construction due to their advantages of convenient construction, low anti-corrosion maintenance costs, and low engineering costs. The existing structural systems mainly include four forms: 1. The tower pier is consolidated at the tower column, the tower beam is separated, and the stiffening beam is suspended by inclined cables except for the side pier (and auxiliary pier) supported by the bearing; 2. On the basis of the floating system, the longitudinal bridge-movable vertical bearings are set on the cross beam under the bridge tower to support the stiffening beam; 3. The stiffening beam is supported by the bearing at the side pier (and auxiliary pier), the tower beam is consolidated at the tower column, and fixed bearings are set to support and consolidate the system on the stiffening beam; 4. The tower beam pier is mutually consolidated at the tower column, and the stiffening beam is supported by the bearing at the side pier (and auxiliary pier). However, the concrete beam cable-stayed bridge has always had the problem of large vertical residual creep deformation of the stiffening beam.

[0003] Since highway operation has no relevant requirements for the vertical residual creep deformation of the stiffening beam of the concrete beam cable-stayed bridge, domestic and foreign highway concrete beam cable-stayed bridges are widely used, such as the Wuhan Yangtze River Second Bridge. However, domestic large-span railway concrete beam cable-stayed bridges are still in the development stage. The main bridge of the Oujiang Bridge on the Yueqing Port Branch Railway under construction is the first large-span concrete beam cable-stayed bridge in China. It is a single-track railway concrete beam cable-stayed bridge with a main span of 300m and a design speed of 120km / h. This is mainly due to the large vertical residual creep deformation of the stiffening beam, which will affect the comfort and safety of the later train operation. Therefore, railway bridges have high requirements for the vertical residual creep deformation of the stiffening beam, generally not exceeding 20mm, and the concrete beam cable-stayed bridges with existing structural systems are difficult to meet this requirement. Summary of the invention

[0004] In order to overcome the shortcomings of the above-mentioned prior art, the purpose of the present invention is to provide a side span consolidation-tower beam semi-floating hybrid system concrete beam cable-stayed bridge, which can solve the problem of high vertical residual creep deformation of the stiffening beam of the concrete beam cable-stayed bridge, and promote the promotion and application of concrete beam cable-stayed bridges in the field of railway bridge construction.

[0005] To achieve the above-mentioned purpose, the technical solution of the present invention is a side span consolidation-tower-beam semi-floating hybrid system concrete beam cable-stayed bridge, comprising a bridge tower, a cable-stayed cable, a stiffening beam and two groups of side span piers located at both ends of the stiffening beam; each group of side span piers includes at least one side span pier; a support is provided on the bridge tower, and the middle part of the stiffening beam is supported on the support; the two ends of the stiffening beam are respectively supported on two groups of side span piers, and at least one side span pier in each group of side span piers is consolidated with the stiffening beam; a cable-stayed cable is provided between the bridge tower and the stiffening beam, and the two ends of the cable-stayed cable are respectively connected to the bridge tower and the stiffening beam.

[0006] Furthermore, the bridge tower includes a tower pier and a tower column, tower columns are arranged on both sides of the stiffening beam, and the bottom of each tower column is fixed to the tower pier; the support is fixed on the tower pier, and the top of the inclined cable is connected to the top of the tower column.

[0007] Furthermore, the towers on both sides of the stiffening beam are provided with limit blocks for limiting the movement of the stiffening beam in the transverse direction of the bridge.

[0008] Furthermore, there is at least one bridge tower, and both sides of each bridge tower in the transverse direction of the bridge are connected to the stiffening beam through multiple pairs of inclined cables, and each pair of inclined cables is respectively connected to both sides of the stiffening beam in the longitudinal direction of the bridge.

[0009] Furthermore, the inclined cables located on both sides of the bridge tower in the transverse direction are arranged symmetrically with respect to the bridge tower.

[0010] Furthermore, the connection points between the inclined cables and the stiffening beam located on the same side of the stiffening beam in the transverse direction and in the longitudinal direction of the stiffening beam are arranged at equal intervals along the longitudinal direction of the bridge.

[0011] Furthermore, connection points between the stay cables and the bridge towers located on the same side of the stiffening beam in the transverse direction and on the same side of the stiffening beam in the longitudinal direction are arranged at equal intervals along the height direction of the bridge towers.

[0012] Furthermore, each group of side span piers includes at least two side span piers, and among the side span piers, a side span pier close to the bridge tower is consolidated with the stiffening beam, and a side span pier away from the bridge tower is provided with a support, and the stiffening beam is supported on the support of the side span pier.

[0013] Furthermore, the bridge tower is arranged on a tower pier foundation, and the side span pier is arranged on a side pier foundation.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] (1) The present invention adopts the method of consolidating the side span piers and the stiffening beams, and arranging bearings on the bridge towers to support the stiffening beams to form a side span consolidation-tower beam semi-floating hybrid system. Through the flexible constraint effect of the side span piers on the stiffening beams, the mechanical performance and vertical residual creep deformation of the stiffening beams are improved to meet the railway driving requirements;

[0016] (2) In the side span consolidation-tower beam semi-floating hybrid system concrete beam cable-stayed bridge of the present invention, at least one side span pier in each group of side span piers is consolidated with the stiffening beam, which can save the number of bridge bearings, reduce the project cost, and reduce the cost of later anti-corrosion maintenance;

[0017] (3) The side span consolidation-tower beam semi-floating hybrid system concrete beam cable-stayed bridge of the present invention has the advantages of high structural rigidity, convenient construction, low anti-corrosion maintenance cost, and low engineering cost;

[0018] (4) The side span consolidation-tower beam semi-floating hybrid system concrete beam cable-stayed bridge of the present invention further broadens the application scope of concrete beam cable-stayed bridges and can effectively promote the promotion and application of concrete beam cable-stayed bridges in the field of railway bridge construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 A schematic structural diagram of a side span consolidation-tower beam semi-floating hybrid system concrete beam cable-stayed bridge provided by an embodiment of the present invention;

[0021] Figure 2 A schematic cross-sectional view of a bridge tower of a side span consolidation-tower beam semi-floating hybrid system concrete beam cable-stayed bridge provided by an embodiment of the present invention;

[0022] In the figure: 1. side span pier, 11. side pier foundation, 2. stiffening beam, 3. bridge tower, 31. tower column, 32. tower pier, 33. limit block, 34. tower pier foundation, 4. inclined cable, 5. support. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0025] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features; in the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0026] like Figure 1-Figure 2 As shown, an embodiment of the present invention provides a side span consolidation-tower beam semi-floating hybrid system concrete beam cable-stayed bridge, comprising a bridge tower 3, a cable-stayed cable 4, a stiffening beam 2 and two groups of side span piers located at both ends of the stiffening beam 2; each group of side span piers includes at least one side span pier 1; a support 5 is provided on the bridge tower 3, and the middle part of the stiffening beam 2 is supported on the support 5; the two ends of the stiffening beam 2 are respectively supported on the two groups of side span piers, and at least one side span pier 1 in each group of side span piers is consolidated with the stiffening beam 2; a cable-stayed cable 4 is provided between the bridge tower 3 and the stiffening beam 2, and the two ends of the cable-stayed cable 4 are respectively connected to the bridge tower 3 and the stiffening beam 2. The present invention adopts a side span pier 1 that is consolidated with a stiffening beam 2, and a support 5 is arranged on a bridge tower 3 to support the stiffening beam 2 to form a side span consolidation-tower beam semi-floating hybrid system. When working, the side span pier 1 can withstand the axial and vertical forces of the stiffening beam 2 and the bending moment caused by it, and through the flexible constraint effect of the side span pier 1 on the stiffening beam 2, the force performance and vertical residual creep deformation of the stiffening beam 2 are effectively improved, the railway driving requirements are met, and the application scope of the concrete beam cable-stayed bridge is further widened; and at least one side span pier 1 in each group of side span piers at both ends of the stiffening beam 2 is consolidated with the stiffening beam 2, which can save the number of bridge supports 5, reduce the project cost, and reduce the later anti-corrosion maintenance costs.

[0027] Specifically, the bridge tower 3 in this embodiment includes a tower pier 32 and a tower column 31. The tower columns 31 are arranged on both sides of the stiffening beam 2, and the bottom of each tower column 31 is fixed to the tower pier 32; the support 5 is fixed on the tower pier 32, and the stiffening beam 2 is supported on the support 5; the top of the inclined cable 4 is connected to the top of the tower column 31, and the bottom is connected to the stiffening beam 2; the top of each tower column 31 is fixed, and there can be two or four tower columns 31. In this embodiment, the bridge tower 3 and the stiffening beam 2 are connected through the support 5 to form a semi-floating system. The number of the bridge tower 3 is not limited and can be set according to specific circumstances, and various types of supports 5 can be used, such as longitudinal movable supports or fixed supports. Optimally, the tower columns 31 on both sides of the stiffening beam 2 are provided with limit blocks 33 for limiting the movement of the stiffening beam 2 along the transverse direction of the bridge, such as Figure 2 As shown, the movement of the stiffening beam 2 in the transverse direction of the bridge is limited by the limit blocks 33 on the tower columns 31 on both sides, thereby ensuring the stability of railway driving.

[0028] Specifically, in this embodiment, there is at least one bridge tower 3, and both sides of each bridge tower 3 in the transverse direction of the bridge are connected to the stiffening beam 2 through multiple pairs of inclined cables 4, and each pair of inclined cables 4 is respectively connected to both sides of the stiffening beam 2 in the longitudinal direction of the bridge, so as to ensure that the stiffening beam 2 is evenly stressed in the transverse direction of the bridge. Furthermore, the inclined cables 4 located on both sides of the bridge tower 3 in the transverse direction of the bridge are symmetrically arranged relative to the bridge tower 3, so as to ensure that the stiffening beams on both sides of the bridge tower 3 in the transverse direction of the bridge are evenly stressed; further, as Figure 1 As shown, the connection points of the inclined cables 4 and the stiffening beam 2 located on the same side of the stiffening beam 2 in the transverse direction and in the longitudinal direction are arranged at equal intervals along the longitudinal direction of the bridge; Figure 2 As shown, the connection points between the inclined cables 4 and the bridge towers 3 which are located on the same side of the stiffening beam 2 in the transverse direction and on the same side of the stiffening beam 2 in the longitudinal direction are arranged at equal intervals along the height direction of the bridge towers 3 .

[0029] In this embodiment, the side span pier group of the cable-stayed bridge is fixedly connected to the stiffening beam 2, and the number of piers in the side span is not limited, and a single pier or multiple piers can be fixedly connected to the stiffening beam 2. Optimally, each side span pier group includes at least two side span piers 1, and among the side span piers 1, a side span pier 1 close to the bridge tower 3 is fixedly connected to the stiffening beam 2, and a side span pier 1 away from the bridge tower 3 is provided with a support 5, and the stiffening beam 2 is fixedly supported on the support 5 of the side span pier 1; Figure 1 As shown, the two groups of side span piers each include two side span piers 1, wherein one side span pier 1 close to the bridge tower 3 is consolidated with the stiffening beam 2, and one side span pier 1 away from the bridge tower 3 supports the stiffening beam 2 through a support. Furthermore, the bridge tower 3 is arranged on the tower pier foundation 34, and the side span pier 1 is arranged on the side pier foundation 11, and the tower pier foundation 34 and the side pier foundation 11 can be pile foundations or expanded foundations, etc.

[0030] The side span consolidation-tower beam semi-floating hybrid system concrete beam cable-stayed bridge of this embodiment has a simple structure, novel and beautiful appearance, convenient construction, economical and applicable, and has the advantages of high structural stiffness, convenient construction, low maintenance cost, etc. It can effectively improve the stress performance and vertical residual creep deformation of the stiffening beam 2 of the cable-stayed bridge, meet the requirements of railway driving, and can effectively promote the promotion and application of concrete beam cable-stayed bridges in the field of railway bridge construction.

[0031] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A side span consolidation-tower-beam semi-floating hybrid system concrete beam cable-stayed bridge, comprising a bridge tower, a cable-stayed cable, a stiffening beam, and two groups of side span piers located at both ends of the stiffening beam; each group of side span piers comprises at least one side span pier; characterized in that: The bridge tower is provided with a support, and the middle part of the stiffening beam is supported on the support; the two ends of the stiffening beam are respectively supported on two groups of side span piers, and at least one side span pier in each group of side span piers is fixed to the stiffening beam; a cable is provided between the bridge tower and the stiffening beam, and the two ends of the cable are respectively connected to the bridge tower and the stiffening beam; each group of side span piers includes at least two side span piers, and among the side span piers, a side span pier close to the bridge tower is fixed to the stiffening beam, and a side span pier away from the bridge tower is provided with a support, and the stiffening beam is supported on the support on the side span pier away from the bridge tower; the bridge tower includes a tower pier and a tower column, and tower columns are provided on both sides of the stiffening beam, and the bottom of each tower column is fixed to the tower pier; The support is fixed on the tower pier, and the top of the inclined cable is connected to the top of the tower column.

2. The side span consolidation-tower beam semi-floating hybrid system concrete beam cable-stayed bridge according to claim 1, characterized in that: The tower columns on both sides of the stiffening beam are provided with limit blocks for limiting the movement of the stiffening beam along the transverse direction of the bridge.

3. The side span consolidation-tower beam semi-floating hybrid system concrete beam cable-stayed bridge according to claim 1, characterized in that: There is at least one bridge tower, and both sides of each bridge tower in the transverse direction of the bridge are connected to the stiffening beam through multiple pairs of inclined cables, and each pair of inclined cables is respectively connected to both sides of the stiffening beam in the longitudinal direction of the bridge.

4. The side span consolidation-tower beam semi-floating hybrid system concrete beam cable-stayed bridge according to claim 3, characterized in that: The inclined cables located on both sides of the bridge tower in the transverse direction are arranged symmetrically relative to the bridge tower.

5. A side span consolidation-tower beam semi-floating hybrid system concrete beam cable-stayed bridge as claimed in claim 3 or 4, characterized in that: The connection points of the inclined cables and the stiffening beam located on the same side of the stiffening beam in the transverse direction and the same side of the stiffening beam in the longitudinal direction are arranged at equal intervals along the longitudinal direction.

6. A side span consolidation-tower beam semi-floating hybrid system concrete beam cable-stayed bridge as claimed in claim 3 or 4, characterized in that: The connection points between the inclined cables and the bridge towers, which are located on the same side of the stiffening beam in the transverse direction and the same side of the stiffening beam in the longitudinal direction, are arranged at equal intervals along the height direction of the bridge towers.

7. The side span consolidation-tower beam semi-floating hybrid system concrete beam cable-stayed bridge according to claim 1, characterized in that: The bridge tower is arranged on a tower pier foundation, and the side span pier is arranged on a side pier foundation.

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