An internal steel strand-strut cable-stayed bridge tower anchoring structure

Abstract

The present invention discloses a built-in steel strand-strut cable-stayed bridge tower anchoring structure, comprising a corbel, which is arranged at the side wall of the bridge tower, and a steel strand-strut combination tie rod steel anchor beam is arranged at the opposite side wall of the corbel, and the steel strand-strut combination tie rod steel anchor beam includes an anchor beam arranged on the corbel, and a steel strand-strut combination is arranged between the two anchor beams. The steel strand-strut combination includes an end anchor plate fixed to the anchor beam, and a steel strand group that bears horizontal tension is arranged between the two end anchor plates. The present invention decomposes the cable force of the inclined cable into vertical and horizontal components through the end anchor beams. The vertical component is transmitted to the bridge tower by the corbel, and the horizontal component is borne by the steel strand-strut combination structure, giving full play to the material properties of the steel plate and the steel strand. Since the steel strand has a large tensile bearing capacity, the amount of steel used can be reduced under the condition of the equal strength principle. The present invention realizes modular assembly, has a flexible assembly method, and is relatively convenient to construct.

Description

Technical Field

[0001] The invention belongs to the technical field of bridge design, and in particular relates to a built-in steel strand-strut cable-stayed bridge tower anchoring structure. Background Art

[0002] Steel anchor beams are a common cable-tower connection method for large-span bridges. When using the steel anchor beam connection method, the bridge tower mainly bears the vertical component of the cable force and the horizontal unbalanced force of the inclined cable, while the steel anchor beam mainly bears the horizontal component of the cable force. It has the characteristics of clear force transmission route, reasonable force and high reliability.

[0003] Traditional steel anchor beams consist of steel crossbeams and anchor beams. In order to reduce the horizontal force on the bridge tower and reduce the risk of cracking in the bridge tower concrete, the steel crossbeams need to have greater rigidity and generally use a large amount of steel, resulting in a large overall weight and making manufacturing, transportation and installation more inconvenient. Summary of the Invention

[0004] The present invention is proposed to solve the problems existing in the prior art, and its purpose is to provide a built-in steel strand-strut cable-stayed bridge tower anchoring structure.

[0005] The technical solution of the present invention is: a built-in steel strand-strut cable-stayed bridge tower anchoring structure, including a corbel, which is arranged at the side wall of the bridge tower, and a steel strand strut combination tie rod steel anchor beam is arranged at the opposite side wall of the corbel, and the steel strand strut combination tie rod steel anchor beam includes an anchor beam arranged on the corbel, and a steel strand strut combination is arranged between the two anchor beams.

[0006] Furthermore, the steel strand strut assembly includes end anchor plates fixed to the anchor beams, and a steel strand group for bearing horizontal tension is provided between the two end anchor plates.

[0007] Furthermore, a compression-only strut is provided between the two end anchor plates to serve as a supporting member when the steel strands are tensioned.

[0008] Furthermore, a temporary tensioning support plate for tensioning the steel strand group is provided at the side wall of the end anchor plate.

[0009] Furthermore, the corbel includes a wall panel fixed to the bridge tower, a supporting plate is provided on the outer wall of the wall panel, and the anchor beam is fixed to the supporting plate.

[0010] Furthermore, the anchor beam and the supporting plate are fixed by high-strength bolts, and a stainless steel plate and a polytetrafluoroethylene plate are provided between the anchor beam and the supporting plate.

[0011] Furthermore, the anchor beam includes a beam body and an anchor assembly, the beam body includes a bottom plate and a top plate parallel thereto, a transverse partition is provided between the bottom plate and the top plate, and the end anchor plate is provided between the bottom plate and the top plate.

[0012] Furthermore, the anchoring assembly includes a web disposed on the beam body, a supporting plate is disposed in the web, a pressure plate is disposed at the end of the supporting plate, and an anchor pad is disposed on the pressure plate.

[0013] Furthermore, the beam body and the anchoring assembly are arranged at an angle.

[0014] This invention uses end anchor beams to decompose the cable forces into vertical and horizontal components. The vertical component is transmitted to the pylons by the corbels, while the horizontal component is borne by the combined steel strand and strut structure. This fully utilizes the material properties of the steel plates and steel strands. Because the steel strands have a high tensile bearing capacity, the amount of steel used can be reduced under the principle of equal strength. This invention achieves modular assembly, offers flexible assembly methods, and facilitates construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a three-dimensional perspective view of the present invention;

[0016] Figure 2 It is a structural schematic diagram of the corbel in the present invention;

[0017] Figure 3 This is a structural diagram of the steel strand brace combined tie rod steel anchor beam in the present invention;

[0018] Figure 4 It is the installation diagram of the present invention;

[0019] in:

[0020] 100 Corbel 101 Wall Plate

[0021] 102 Plate stiffener 103 Support plate

[0022] 104 supporting vertical plate 105 polytetrafluoroethylene plate

[0023] 106 stainless steel plate 107 bridge tower concrete connector

[0024] 200 steel strand support rod combined tie rod steel anchor beam

[0025] 201 anchor beam 2011 anchor plate

[0026] 2012 pressure plate 2013 support plate

[0027] 2014 web plate 2015 diaphragm plate

[0028] 2016 top plate 2017 bottom plate

[0029] 202 steel strand support rod combination

[0030] 2021 End Anchor Plate 2022 Stiffener

[0031] 2023 Compression support rod only 2024 Temporary tension support plate

[0032] 2025 strand set. DETAILED DESCRIPTION

[0033] Hereinafter, the present invention will be described in detail with reference to the accompanying drawings and embodiments:

[0034] like Figures 1 to 4 As shown, a built-in steel strand-strut cable-stayed bridge tower anchoring structure includes a corbel 100, which is arranged at the side wall of the bridge tower, and a steel strand-strut combination tie rod steel anchor beam 200 is arranged at the opposite side wall of the corbel 100. The steel strand-strut combination tie rod steel anchor beam 200 includes an anchor beam 201 arranged on the corbel 100, and a steel strand-strut combination 202 is arranged between the two anchor beams 201.

[0035] The steel strand strut assembly 202 includes end anchor plates 2021 fixed to the anchor beam 201 , and a steel strand group 2025 for bearing horizontal tension is provided between the two end anchor plates 2021 .

[0036] A compression-only strut 2023 is also provided between the two end anchor plates 2021 to serve as a supporting member when tensioning the steel strands.

[0037] A temporary tensioning support plate 2024 for tensioning the steel strand group 2025 is provided at the side wall of the end anchor plate 2021 .

[0038] The corbel 100 includes a wall panel 101 fixed to the bridge tower. A supporting plate 103 is provided on the outer wall of the wall panel 101 , and the anchor beam 201 is fixed to the supporting plate 103 .

[0039] The anchor beam 201 is fixed to the supporting plate 103 by high-strength bolts. A stainless steel plate 106 and a polytetrafluoroethylene plate 105 are provided between the anchor beam 201 and the supporting plate 103 .

[0040] The anchor beam 201 includes a beam body and an anchor assembly. The beam body includes a bottom plate 2017 and a top plate 2016 parallel thereto. A transverse partition 2015 is provided between the bottom plate 2017 and the top plate 2016 . The end anchor plate 2021 is provided between the bottom plate 2017 and the top plate 2016 .

[0041] The anchoring assembly includes a web 2014 provided on the beam body, a support plate 2013 is provided in the web 2014 , a pressure plate 2012 is provided at the end of the support plate 2013 , and an anchor pad 2011 is provided on the pressure plate 2012 .

[0042] The beam body and the anchoring assembly are arranged obliquely.

[0043] The vertical and horizontal components of the cable force are respectively transmitted to the corbel 100 and the steel strand strut combined tie rod steel anchor beam 200 through the anchor beam 201 .

[0044] In the steel strand strut combined tie rod steel anchor beam 200 , the cable force is transferred to the web 2014 through the anchor pad 2011 , the pressure plate 2012 , and the support plate 2013 , forming vertical and horizontal force components in the web 2014 .

[0045] The steel strand support rod combined tie rod steel anchor beam 200 transmits the horizontal force component of the inclined cable, and the steel strand group 2025 is anchored on the end anchor plates 2021 on both sides.

[0046] Accordingly, the number of steel strands is determined based on the balanced cable forces on both sides. Compared with steel materials bearing the same tensile force, the ultimate tensile strength can be increased and the amount of steel plates used can be reduced.

[0047] A compression-only strut 2023 is also provided between the end anchor plates 2021 on both sides, which is used to apply initial tension to the steel strand. The compression-only strut 2023 is connected to the end anchor plates 2021 in the form of double nuts. The compression-only strut 2023 is a double-headed long screw, and each section is fixed by two nuts. The outer nut is movable and the inner nut is fixed, thereby ensuring that the amount of movement of the compression-only strut 2023 is consistent.

[0048] A supporting vertical plate 104 is provided between the lower end of the supporting flat plate 103 and the outer wall of the wall panel 101 to reinforce the supporting flat plate 103 . The supporting vertical plate 104 is perpendicular to the bottom surface of the supporting flat plate 103 .

[0049] Flat plate stiffening ribs 102 are provided between the supporting flat plate 103 and the supporting vertical plate 104 to reinforce the two.

[0050] The stiffening ribs 2022 are arranged on the anchor plates 2021 at both ends.

[0051] An installation method of the present invention:

[0052] First, the corbel 100 is assembled on site, and the anchor beam 201 is fixed to the corresponding position of the corbel 100 .

[0053] Then, temporary tensioning braces 2024 and compression-only braces 2023 are installed in the anchor beam 201 .

[0054] Then, the steel strand group 2025 is installed, and the same initial tension is applied to the steel strand group 2025 using a temporary tensioning support plate 2024 so that only the compression support rod 2023 is compressed.

[0055] Then, the entire structure is hoisted into the bridge tower.

[0056] Then, the inclined cables are installed and tensioned, and after completion, the temporary tensioning support plate 2024 is removed.

[0057] Finally, the anchor beam 201 and the corbel 100 are fixed.

[0058] Another installation method of the present invention:

[0059] First, the corbel 100 and the steel strand strut combined tie rod steel anchor beam 200 are hoisted into the tower in blocks.

[0060] Then, the anchor beams 201 are assembled, the temporary tensioning plates 2024 and the compression-only struts 2023 are assembled, and the steel strand groups 2025 are tensioned.

[0061] Finally, after the stay cables are tensioned, the temporary tensioning support plate 2024 is removed, and the anchor beam 201 and the corbel 100 are fixed.

[0062] The present invention does not require on-site welding of the main load-bearing structure, thus saving on-site welding workload and improving construction efficiency.

[0063] This invention uses end anchor beams to decompose the cable forces into vertical and horizontal components. The vertical component is transmitted to the pylons by the corbels, while the horizontal component is borne by the combined steel strand and strut structure. This fully utilizes the material properties of the steel plates and steel strands. Because the steel strands have a high tensile bearing capacity, the amount of steel used can be reduced under the principle of equal strength. This invention achieves modular assembly, offers flexible assembly methods, and facilitates construction.

Claims

1. A built-in steel strand-strut cable-stayed bridge tower anchoring structure, comprising a bracket (100), characterized in that: The corbel (100) is arranged at the side wall of the bridge tower, and a steel strand brace rod combination tie rod steel anchor beam (200) is arranged at the opposite side wall of the corbel (100), and the steel strand brace rod combination tie rod steel anchor beam (200) includes an anchor beam (201) arranged on the corbel (100), and a steel strand brace rod combination (202) is arranged between the two anchor beams (201); The steel strand support rod assembly (202) comprises an end anchor plate (2021) fixed to the anchor beam (201), and a steel strand group (225) for bearing horizontal tension is provided between the two end anchor plates (2021); The anchoring beam (201) comprises a beam body and an anchoring assembly, the beam body comprises a bottom plate (2017) and a top plate (2016) parallel thereto, a transverse partition (2015) is provided between the bottom plate (2017) and the top plate (2016), and the end anchor plate (2021) is provided between the bottom plate (2017) and the top plate (2016); The anchoring assembly comprises a web (2014) arranged on the beam body, a support plate (2013) being arranged in the web (2014), a pressure plate (2012) being arranged at the end of the support plate (2013), and an anchor pad (2011) being arranged on the pressure plate (2012); In the steel strand support rod combined tie rod steel anchor beam (200), the cable force of the inclined cable is transmitted to the web (2014) through the anchor pad (2011), the pressure plate (2012), and the support plate (2013), forming vertical force components and horizontal force components in the web (2014); The steel strand support rod combined tie rod steel anchor beam (200) transmits the horizontal component of the inclined cable force, and the steel strand group (2025) is anchored on the end anchor plates (221) on both sides; A compression-only strut (2023) is further provided between the end anchor plates (2021) on both sides for applying initial tension to the steel strands. The compression-only strut (2023) is connected to the end anchor plates (2021) in the form of double nuts. The compression-only strut (2023) is a double-headed long screw, and each section is fixed by two nuts. The outer nut is movable and the inner nut is fixed, thereby ensuring that the movement of the compression-only strut (2023) is consistent.

2. The internal steel strand-strut cable-stayed bridge tower anchoring structure according to claim 1, characterized in that: A temporary tensioning support plate (2024) for tensioning the steel strand group (2025) is provided at the side wall of the end anchor plate (2021).

3. The internal steel strand-strut cable-stayed bridge tower anchoring structure according to claim 1, characterized in that: The corbel (100) comprises a wall panel (101) fixed to the bridge tower, a supporting plate (103) is provided on the outer wall of the wall panel (101), and the anchor beam (201) is fixed to the supporting plate (103).

4. The internal steel strand-strut cable-stayed bridge tower anchoring structure according to claim 3, characterized in that: The anchor beam (201) and the supporting plate (103) are fixed by high-strength bolts, and a stainless steel plate (106) and a polytetrafluoroethylene plate (105) are provided between the anchor beam (201) and the supporting plate (103).

5. The internal steel strand-strut cable-stayed bridge tower anchoring structure according to claim 1, characterized in that: The beam body and the anchoring assembly are arranged obliquely.

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