Tower end self-balancing anchoring structure and its elastic cable system

Abstract

The present application relates to a kind of tower end self-balancing anchoring structure and elastic restraint system, including bridge tower beam, bridge tower beam is equipped with main beam, bridge tower beam and main beam two sides are equipped with middle tower column, main beam and bridge tower beam are all equipped with several anchoring structures;Wherein the lower end of anchor plate in one of anchoring structures is fixed on bridge tower beam, the upper end of anchor plate in another anchoring structure is fixed on main beam;Elastic cable one end is connected on the anchor head on bridge tower beam, the other end is connected on the anchor head on main beam.The beneficial effects of the present application are: 1, anchoring structure is arranged in the same straight line direction, and the elastic cable in the same straight line direction is balanced under stress;2, reduce the additional bending moment of elastic cable to main beam;3, anchoring structure uses PBL shear key connection mode in tower end, with the advantage of firm anchoring, and avoid the risk that concrete anchoring is easy to crack.

Description

Technical Field

[0001] This invention relates to the field of bridge construction technology, and in particular to a self-balancing anchorage structure at the tower end and its elastic cable system. Background Technology

[0002] Cable-stayed bridges, as a representative type of long-span bridges, are frequently used in projects spanning wide rivers, lakes, mountain valleys, and straits. Due to their outstanding performance in long-span bridges, they have become one of the most competitive and important bridge types for long and large bridges.

[0003] Among existing two-tower cable-stayed bridges with main spans exceeding 1,000 meters, the connection methods between the towers and beams mainly include semi-floating, longitudinally fixed, and longitudinally elastically constrained systems. Among these, the semi-floating system exhibits relatively small seismic response of the towers. However, under static loads, the beam-end displacement and tower bending moment are large, especially for three-tower cable-stayed bridges with main spans exceeding 3,000 meters, where the effect is more pronounced due to the longer span compared to two-tower bridges. The longitudinally fixed system also exhibits a significant seismic response. Therefore, for three-tower cable-stayed bridges with main spans exceeding 1,000 meters, a longitudinally elastically constrained system is relatively more suitable.

[0004] The longitudinal elastic restraint system is anchored at one end to the main tower and at the other end to the main girder. To avoid temperature-induced internal forces in the main girder due to the elastic restraint, the anchorage end of the main girder should be located near the zero temperature point of the main girder. For a longitudinally symmetrical, long-span three-tower cable-stayed bridge, the zero temperature point of the main girder is located at the middle tower. Therefore, the anchorage point at the tower end of the longitudinal elastic cable can be placed at the middle tower, and the anchorage point at the beam end can be placed near the middle tower on the main girder. However, there are currently no engineering examples of a longitudinal elastic cable restraint system for a three-tower cable-stayed bridge.

[0005] Therefore, it is essential to provide a self-balancing anchorage structure at the tower end and its elastic cable system to effectively solve the anchorage structure of the cable tower and cable beam in the elastic cable constraint system, achieve effective longitudinal constraint of the bridge, and reduce the additional effects caused therefrom. Summary of the Invention

[0006] This invention provides a self-balancing anchoring structure at the tower end and its elastic cable system, which can solve the problems in related technologies.

[0007] On the one hand, embodiments of the present invention provide a self-balancing anchoring structure for tower ends.

[0008] The system includes an anchoring structure comprising an anchor plate, a bearing plate, an anchor pad, an anchor head, and an elastic cable. Two anchor plates are provided, vertically arranged along the longitudinal direction of the bridge, and each anchor plate has several circular holes. Two bearing plates are provided, both fixed to the anchor plates and horizontally arranged along the longitudinal direction of the bridge. The anchor pad is arranged along the transverse direction of the bridge and fixed to one end of the bearing plate along the longitudinal direction of the bridge. The anchor head is fixed to the side of the anchor pad away from the bearing plate. Both ends of the elastic cable are respectively fixed to the anchor heads of the corresponding anchoring structures.

[0009] Furthermore, the anchoring structure also includes a cable guide, which is disposed between the two anchor plates and the two bearing plates.

[0010] Furthermore, stiffening ribs are provided on both sides of the cable guide, the stiffening ribs are arranged along the longitudinal bridge direction and fixed to the pressure plate in the vertical direction.

[0011] Furthermore, both the cable guide and the stiffening rib are fixed to the anchor plate.

[0012] Furthermore, the elastic cable passes through the cable guide and the anchor plate, and is fixed to the anchor head.

[0013] On the one hand, an elastic constraint system is provided, including a tower end self-balancing anchoring structure as described in any of the above.

[0014] Furthermore, the bridge tower crossbeam includes a main beam on the bridge tower crossbeam, and central tower columns are provided on both sides of the bridge tower crossbeam and the main beam. Several anchoring structures are provided on both the main beam and the bridge tower crossbeam. Concrete pads are provided between the main beam and the bridge tower crossbeam and the anchoring structures. One end of the anchor plate is inserted into the concrete pad.

[0015] Furthermore, in one of the anchoring structures, the lower end of the anchor plate is fixed to the bridge tower crossbeam, and in the other anchoring structure, the upper end of the anchor plate is fixed to the main beam.

[0016] Furthermore, one end of the elastic cable is connected to the anchor head on the bridge tower crossbeam, and the other end is connected to the anchor head on the main beam. The elastic cable is provided in multiple sets, and each set of the elastic cable has two elastic cables, which are arranged along the same straight line.

[0017] Furthermore, the circular hole is located at the part where the anchor plate is inserted into the concrete pad, and a reinforcing bar is provided in the circular hole to form a PBL shear key.

[0018] The beneficial effects of the technical solution provided by this invention include: 1. Setting the anchoring structure in the same straight direction, the elastic cables in the same straight direction are balanced by each other; 2. Reducing the additional bending moment of the elastic cable on the main beam; 3. The anchoring structure adopts the PBL shear key connection method at the tower end, which has the advantage of strong anchoring and avoids the risk of easy cracking of concrete anchoring. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of an elastic constraint system according to the present invention;

[0021] Figure 2 for Figure 1 Cross-sectional view of surface AA;

[0022] Figure 3 for Figure 1 Enlarged view of point Q;

[0023] Figure 4 for Figure 3 Cross-sectional view of the BB surface.

[0024] In the diagram: 100. Anchoring structure; 110. Anchor plate; 111. Circular hole; 120. Bearing plate; 130. Anchor plate; 140. Anchor head; 150. Elastic cable; 160. Cable guide tube; 170. Stiffening rib; 200. Bridge tower crossbeam; 210. Main beam; 220. Middle tower column; 230. Concrete pad. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] See Figures 3 to 4As shown, this embodiment of the invention provides a structure for an elastic constraint system, including an anchoring structure 100. The anchoring structure 100 includes an anchor plate 110, a pressure plate 120, an anchor pad 130, an anchor head 140, and an elastic cable 150. Two anchor plates 110 are provided and are arranged vertically along the longitudinal direction of the bridge. Two pressure plates 120 are provided, both fixed to the anchor plates 110 and arranged horizontally along the longitudinal direction of the bridge. The anchor plates 110 have several circular holes 111. The anchor pad 130 is arranged along the transverse direction of the bridge and fixed to one end of the pressure plate 120 arranged along the longitudinal direction of the bridge. The anchor head 140 is fixed to the side of the anchor pad 130 away from the pressure plate 120. The elastic cable 150 has both ends fixed to the corresponding anchor heads 140 of the anchoring structure 100.

[0027] In some embodiments, the anchoring structure 100 further includes a cable guide 160 disposed between the two anchor plates 110 and the two bearing plates 120.

[0028] In some embodiments, the cable guide 160 is provided with stiffening ribs 170 on both sides, the stiffening ribs 170 are arranged along the longitudinal bridge direction and fixed to the pressure plate 120 in the vertical direction.

[0029] In some embodiments, the cable guide 160 and the stiffening rib 170 are both fixed to the anchor plate 130.

[0030] In some embodiments, the elastic cable 150 passes through the cable guide 160 and the anchor plate 130, and is fixed to the anchor head 140.

[0031] See Figures 1 to 2 As shown, on the one hand, an elastic constraint system is provided, including the tower end self-balancing anchoring structure described above.

[0032] In some embodiments, the bridge includes a bridge tower crossbeam 200, on which a main beam 210 is provided. Middle tower columns 220 are provided on both sides of the bridge tower crossbeam 200 and the main beam 210. Several anchoring structures 100 are provided on both the main beam 210 and the bridge tower crossbeam 200. Concrete pad stones 230 are provided between the main beam 210, the bridge tower crossbeam 200 and the anchoring structures 100. One end of the anchor plate 110 is inserted into the concrete pad stone 230.

[0033] In this embodiment, a bridge tower crossbeam 200 is included, on which a main beam 210 is provided. Central tower columns 220 are provided on both sides of the bridge tower crossbeam 200 and the main beam 210. Several anchoring structures 100 are provided on both the main beam 210 and the bridge tower crossbeam 200. Concrete pads 230 are provided between the main beam 210, the bridge tower crossbeam 200, and the anchoring structures 100. One end of an anchor plate 110 is inserted into the concrete pad 230. The concrete pad 230 is used to increase the tension space of the elastic cable 150 at the end of the bridge tower crossbeam 200, while simultaneously reducing the distance between the elastic cable 150 and the bottom of the beam, thus reducing the additional bending moment of the elastic cable 150 on the main beam 210.

[0034] In some embodiments, the lower end of the anchor plate 110 in one of the anchoring structures 100 is fixed to the bridge tower crossbeam 200, and the upper end of the anchor plate 110 in the other anchoring structure 100 is fixed to the main beam 210.

[0035] In this embodiment, a bridge tower crossbeam 200 is included, a main beam 210 is provided on the bridge tower crossbeam 200, and central tower columns 220 are provided on both sides of the bridge tower crossbeam 200 and the main beam 210. A plurality of anchoring structures 100 are provided on both the main beam 210 and the bridge tower crossbeam 200. A concrete pad stone 230 is provided between the main beam 210, the bridge tower crossbeam 200 and the anchoring structure 100, and one end of the anchor plate 110 is inserted into the concrete pad stone 230.

[0036] In addition, the lower end of the anchor plate 110 in one of the anchoring structures 100 is fixed to the bridge tower crossbeam 200, and the upper end of the anchor plate 110 in the other anchoring structure 100 is fixed to the main beam 210.

[0037] Meanwhile, the anchoring structure 100 fixed on the bridge tower crossbeam 200 is the tower end anchoring structure 100, and the anchoring structure 100 fixed on the main beam 210 is the beam end anchoring structure 100.

[0038] In some embodiments, one end of the elastic cable 150 is connected to the anchor head 140 on the bridge tower crossbeam 200, and the other end is connected to the anchor head 140 on the main beam 210. The elastic cable 150 is provided in multiple sets, and each set of the elastic cable 150 has two elastic cables 150 arranged along the same straight line.

[0039] In this embodiment, a bridge tower crossbeam 200 is included, a main beam 210 is provided on the bridge tower crossbeam 200, and central tower columns 220 are provided on both sides of the bridge tower crossbeam 200 and the main beam 210. A plurality of anchoring structures 100 are provided on both the main beam 210 and the bridge tower crossbeam 200. A concrete pad stone 230 is provided between the main beam 210, the bridge tower crossbeam 200 and the anchoring structure 100, and one end of the anchor plate 110 is inserted into the concrete pad stone 230.

[0040] In addition, the lower end of the anchor plate 110 in one of the anchoring structures 100 is fixed to the bridge tower crossbeam 200, and the upper end of the anchor plate 110 in the other anchoring structure 100 is fixed to the main beam 210.

[0041] The anchoring structure 100 fixed on the bridge tower crossbeam 200 is the tower end anchoring structure 100, and the anchoring structure 100 fixed on the main beam 210 is the beam end anchoring structure 100.

[0042] Simultaneously, along the longitudinal direction of the bridge, on the same straight line, the anchorage structure 100 at the first beam end is connected to the anchorage structure 100 at the first tower end, and the anchorage structure 100 at the second tower end is connected to the anchorage structure 100 at the second beam end. Elastic cables 150 are used to connect the anchorage structure 100 at the first beam end to the anchorage structure 100 at the first tower end, and the anchorage structure 100 at the second tower end to the anchorage structure 100 at the second beam end. When live load and additional forces are applied to the main beam 210, the main beam 210 tends to move to one side. When the stress on the elastic cable 150 between the anchorage structure 100 at the first beam end and the anchorage structure 100 at the first tower end increases, the stress on the elastic cable 150 between the anchorage structure 100 at the second tower end and the anchorage structure 100 at the second beam end decreases; when the stress on the elastic cable 150 between the anchorage structure 100 at the first beam end and the anchorage structure 100 at the first tower end decreases, the stress on the elastic cable 150 between the anchorage structure 100 at the second tower end and the anchorage structure 100 at the second beam end increases.

[0043] Finally, the tension of the elastic cable 150 under constant load conditions needs to ensure that the elastic cable 150 remains taut even under the most unfavorable conditions of live load and additional force.

[0044] See Figure 3 As shown, in some embodiments, the circular hole 111 is located at the part where the anchor plate 110 is inserted into the concrete pad 230, and a reinforcing bar is provided in the circular hole to form a PBL shear key.

[0045] In this embodiment, the portion of the anchor plate 110 inserted into the concrete pad 230 has several circular holes, and reinforcing bars are installed in the circular holes to form PBL shear keys. Since the anchoring structure 100 adopts the PBL shear key connection method at the end of the bridge tower beam 200, the anchoring is more secure, and at the same time, the risk of cracking of the concrete anchoring structure is avoided.

[0046] The beneficial effects of this invention are as follows:

[0047] 1. The anchoring structures are set in the same straight direction, and the elastic cables in the same straight direction are balanced by each other; 2. The additional bending moment of the elastic cables on the main beam is reduced; 3. The anchoring structure adopts the PBL shear key connection method at the tower end, which has the advantage of strong anchoring and avoids the risk of easy cracking of concrete anchoring.

[0048] In the description of this invention, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Unless otherwise expressly specified and limited, the terms "set," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this invention can be understood according to the specific circumstances.

[0049] It should be noted that, in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the term "comprising," or any other variation thereof, is intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus.

[0050] The above description is merely a specific embodiment of the present invention, enabling those skilled in the art to understand or implement the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features of the invention herein.

Claims

1. An elastic constraint system, characterized in that, include, The self-balancing anchoring structure at the tower end includes, Anchoring structure (100). It includes two anchor plates (110) and is arranged vertically along the longitudinal direction of the bridge. The anchor plates (110) are provided with several round holes (111). Two pressure plates (120) are provided, both of which are fixed on the anchor plate (110) and are horizontally arranged along the longitudinal direction of the bridge. An anchor plate (130) is provided along the transverse direction of the bridge and fixed to one end of the bearing plate (120) provided along the longitudinal direction of the bridge; An anchor head (140) is fixed to the side of the anchor plate (130) away from the bearing plate (120); The elastic cable (150) is fixed at both ends to the anchor head (140) of the corresponding anchoring structure (100); The bridge includes a bridge tower crossbeam (200), on which a main beam (210) is provided. Middle tower columns (220) are provided on both sides of the bridge tower crossbeam (200) and the main beam (210). Several anchoring structures (100) are provided on both the main beam (210) and the bridge tower crossbeam (200). Concrete pads (230) are provided between the main beam (210) and the bridge tower crossbeam (200) and the anchoring structures (100). One end of the anchor plate (110) is inserted into the concrete pad (230). In one of the anchoring structures (100), the lower end of the anchor plate (110) is fixed to the bridge tower crossbeam (200), and in the other anchoring structure (100), the upper end of the anchor plate (110) is fixed to the main beam (210). One end of the elastic cable (150) is connected to the anchor head (140) on the bridge tower crossbeam (200), and the other end is connected to the anchor head (140) on the main beam (210). The elastic cable (150) is provided in multiple sets, and each set of the elastic cable (150) has two elastic cables (150) arranged along the same straight line. The circular hole (111) is located at the part where the anchor plate (110) is inserted into the concrete pad stone (230), and a steel bar is provided in the circular hole (111) to form a PBL shear key.

2. The elastic constraint system as described in claim 1, characterized in that, The anchoring structure (100) also includes a cable guide (160), which is disposed between the two anchor plates (110) and the two bearing plates (120).

3. The elastic constraint system as described in claim 2, characterized in that, The cable guide (160) is provided with stiffening ribs (170) on both sides. The stiffening ribs (170) are arranged along the longitudinal bridge direction and fixed on the pressure plate (120) in the vertical direction.

4. The elastic constraint system as described in claim 3, characterized in that, The cable guide (160) and the stiffening rib (170) are both fixed to the anchor plate (130).

5. The elastic constraint system as described in claim 4, characterized in that, The elastic cable (150) passes through the cable guide (160) and the anchor plate (130) and is fixed to the anchor head (140).

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