Arch bridge with horizontally tensioned tie cables

Abstract

The present invention discloses an arch bridge with laterally tensioned tie cables, which includes a main arch, a main beam, and tie cables respectively and correspondingly anchored at both ends of the main arch. The tie cables are distributed with lateral tensioning components for applying lateral tensile forces thereto along the length direction, and the acting points of the lateral tensioning components are located on the main beam. The present invention actively laterally tensions and adjusts the cable forces of the tie cables, thereby forming the longitudinal tensile forces of the tie cables, and can overcome the problems of insufficient tensioning space for the tie cables at the end or inside of the arch seat and the too large specifications of equipment such as jacks required. By implementing the lateral tensile forces through multiple groups of tensioning components, each group of tensioning components only applies a small lateral tensile force, and the longitudinal tension of the tie cables can be effectively adjusted to achieve low-cost and flexible tensioning and cable force adjustment of the tie cables. Moreover, a unified, orderly but variable structure can be formed among the lateral tensioning components, and the curve plane linear shape of the tie cables corresponds to the inclined inner arch ribs, with novel form and beautiful shape.

Description

Technical Field

[0001] The invention relates to the field of civil engineering, and in particular to a tied arch bridge structure. Background Art

[0002] The tied arch bridge is a structural system that uses tie cables to balance the horizontal thrust of the arch ribs. It is widely used due to its advantages such as beautiful shape, large span capacity, and strong adaptability to foundation conditions.

[0003] In the prior art, the tensioning solution for the tie cables of the tied arch bridge generally adopts jacks to tension at the anchor points at both ends of the tie cables. However, as the span of the bottom-supported tied arch bridge increases, the cable force of the tie cables and their corresponding specifications need to be increased to a large enough size to balance the thrust of the arch. When the cable force of the tie cables and their corresponding specifications exceed the norm, it is necessary to develop a very large jack or replace one tie cable with multiple tie cables to achieve the desired purpose. The cost of specially making a jack to achieve a very large tensioning force is very high, and due to the conditions of the anchor point, the working space required for the jack is also very large, and the operating space is also limited. In addition, replacing one tie cable with multiple tie cables can disperse the force and reduce the tensioning force, but there will be problems such as uneven force on the tie cables, complex anchoring structure of the tie cables, and the need for a larger anchoring space.

[0004] Therefore, a method for processing the tie cables of a tie arch bridge is needed, which can ensure the formation of a large tensioning force and is suitable for tie arch bridges with larger spans. During the tensioning process, a large tensioning space is not occupied and no special large-tonnage jacks or other tensioning equipment are required, thereby saving construction costs and improving work efficiency. Summary of the invention

[0005] In view of this, the purpose of the present invention is to provide an arch bridge with transverse tensioned tie cables, which can ensure the formation of a large tensioning force and is suitable for tie arch bridges with larger spans. During the tensioning process, it does not occupy a large tensioning space and does not require special large-tonnage jacks and other tensioning equipment, thereby saving construction costs and improving work efficiency.

[0006] The arch bridge with transverse tensioned tie cables of the present invention comprises a main arch, a main beam and tie cables whose two ends are respectively anchored corresponding to the two ends of the main arch. The tie cables are provided with transverse tensioning components for applying transverse tensioning force thereto along the length direction, and the force point of the transverse tensioning components is located on the main beam.

[0007] Furthermore, the tie rod cables are two cables which are symmetrically arranged on both sides of the main beam in the transverse direction and are both provided with the transverse tensioning components. The plane line shape of the tie rod cables to which the transverse tensioning force is applied is a smooth curve bending toward the center line of the main beam.

[0008] Furthermore, the transverse tensioning assembly includes a transverse tension rod. One end of the transverse tension rod is fixedly connected to the tie cable, and the other end is fixed at a set position on the main girder after tensioning is completed.

[0009] Furthermore, the transverse tensioning assembly further includes a tension outer sleeve fixed to the main girder and a tension inner sleeve sleeved inside the tension outer sleeve. One end of the transverse tension rod is fixedly connected to the tie cable through the tension inner sleeve, and the other end passes through the tension outer sleeve and is fixed at a set position on the main girder after tensioning is completed.

[0010] Furthermore, the transverse tensioning assembly further includes a diagonal bracing rod. One end of the diagonal bracing rod is fixed at a set position on the main girder, and the other end is fixed to the outer sleeve obliquely upward to form a support for it.

[0011] Furthermore, the main arch includes two laterally juxtaposed arch ribs. The two tie cables are arranged corresponding to the two arch ribs and are respectively anchored to the arch seats at both ends of the corresponding arch ribs.

[0012] Furthermore, a plurality of cross braces are fixedly arranged at equal intervals along the length direction between the two arch ribs, and an arch seat cross beam is fixed between the arch seats at the same end of the two arch ribs. The width of the main girder is less than the lateral distance between the arch seats at the same end of the two arch ribs.

[0013] Furthermore, the main girder is a box girder, and transverse diaphragms are distributed longitudinally inside the box girder; each transverse tensioning assembly has two transverse tension rods, and the two transverse tension rods are arranged on both sides of the corresponding transverse diaphragm and are respectively fixed on both sides of the transverse diaphragm after tensioning is completed; the tension outer sleeve is fixed to the web on the corresponding side of the box girder and is located at the transverse diaphragm; a pressure-bearing assembly corresponding to the transverse tension rod is further included. The pressure-bearing assembly includes two pressure-bearing vertical plates fixedly arranged on the main girder along the tensioning direction and juxtaposed, and a pressure-bearing cross plate fixedly connected to the two pressure-bearing vertical plates. The transverse tension rod is located between the two pressure-bearing vertical plates and passes through the pressure-bearing cross plate to complete tensioning and fixation.

[0014] Furthermore, the two arch ribs are inclined towards the center line of the main girder.

[0015] Furthermore, the tension inner sleeve is fixed to the corresponding tie cable through a fixed cable clamp. After tensioning is completed, a fixation is formed along the length direction between the tension outer sleeve and the tension inner sleeve.

[0016] Advantages of the present invention: For the arch bridge with laterally tensioned tie cables of the present invention, the lateral tension and adjustment of the tie cable forces are actively carried out, thereby forming the longitudinal tensile force of the tie cables, which can overcome the problems of insufficient tensioning space for tie cables at the ends or inside of the arch seats and the too large specifications of equipment such as jacks required; the lateral tensile force is implemented through multiple sets of tensioning components, and each set of tensioning components only applies a small lateral tensile force, which can effectively adjust the longitudinal tension of the tie cables, so as to realize the low-cost and flexible tensioning and cable force adjustment of the tie cables; since the components of the tensioning components apply a small tensile force for each set, each component only needs to adopt light members, which can be manufactured in the factory, transported to the site and fixed to the set parts of the main beam after tensioning; due to the small size of the members, the welding workload is small, the installation is fast and convenient, and the cost is low; since the lateral tensioning components connect the main beam and the tie cables to form a new statically determinate structure, without increasing the bridge deck width and the amount of main beam materials, the lateral stiffness of the main beam is significantly increased and the lateral amplitude is reduced; and a unified, orderly but varied structure can be formed among the lateral tensioning components, and the curve plane linear shape of the tie cables corresponds to the inwardly inclined arch ribs, with novel form and beautiful appearance. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described below in conjunction with the drawings and embodiments.

[0018] Figure 1 is a three-dimensional structural schematic diagram of the present invention.

[0019] Figure 2 is Figure 1 side view (end part) of

[0020] Figure 3 is an enlarged structural schematic diagram of the lateral tensioning component.

[0021] Figure 4 is an enlarged structural schematic diagram of the lateral tensioning component (in another direction).

[0022] Figure 5 is an exploded structural schematic diagram of the lateral tensioning component. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] Figure 1 As shown in the structural schematic diagram of the present invention: The arch bridge with laterally tensioned tie cables in this embodiment includes a main arch 1, a main beam 6, and tie cables 7 respectively anchored at both ends corresponding to both ends of the main arch. The tie cables 7 are distributed with lateral tensioning components for applying lateral tensile forces to them along the length direction, and the acting points of the lateral tensioning components are located on the main beam 6;

[0024] The transverse tensioning assembly refers to all equipment capable of transversely tensioning the tie rod cable 7, and the force application point being located on the main girder means that the transverse force during and after the tensioning of the tie rod cable by the transverse tensioning assembly is applied to the main girder; it can be of various structures. For example, one end of a tensioning rod (cable) is fixed to the tie rod cable, and the other end is fixed to the main girder 6 after tensioning; the tensioning method (tensioning assembly) can be that a tensioning rod (cable) passes through the main girder and a jack applies the tension, or it can be tensioned through a screw pair. In short, any mechanical structure capable of achieving transverse tensioning can be used in the present invention; of course, when adopting a transverse tensioning structure, the tie rod cable 7 needs to be a flexible cable, which will not be elaborated here.

[0025] The complete arch bridge also includes suspension cables 5, bridge piers, etc., which will not be elaborated here; and one end of the main arch of the tied-arch bridge is fixed to the bridge pier through a fixed support 12, and the other end is supported on another bridge pier through a movable support 13. This belongs to the usual structure of the tied-arch bridge and will not be elaborated here; in the present invention, the entire structure utilizes the main arch to be compressed and the tie rod cable 7 to be tensioned to form a self-balanced force system. By arranging a fixed support 12 directly below one end of the main arch and a longitudinal movable support 13 directly below the other end, and arranging a tie rod cable 7 between the two ends of the main arch 1, the horizontal thrust generated by the main arch 1 is completely borne by the tie rod cable 7 whose cable force can be adjusted, and the main girder only bears the bending moment and does not bear axial tension.

[0026] In this embodiment, the tie rod cables 7 are two, symmetrically arranged along the transverse direction on both sides of the main girder 6, and the transverse tensioning assemblies are distributed on both of them. The plane linear shape of the tie rod cable subjected to the transverse tensioning force is a smooth curve bending towards the center line of the main girder; as shown in the figure, the two tie rod cables 7 located on both sides of the main girder 6 are subjected to a relatively uniform transverse tensioning force in the length direction, and these transverse tensioning forces are converted into the longitudinal tensioning force of the tie rod cable, so as to achieve the effect of eliminating the horizontal component force of the main arch and the horizontal force of the main girder; moreover, the formed smooth curve after tensioning adapts to the distribution of the stress condition, ensuring the good stress of the entire tie rod cable.

[0027] In this embodiment, the transverse tensioning assembly includes a transverse tensioning rod 11. One end of the transverse tensioning rod 11 is fixedly connected to the tie cable 7, and the other end is fixed at a set position on the main beam 6 after the tensioning is completed. The set position varies according to the structure of the main beam 6. The way to fix one end of the transverse tensioning rod 11 to the tie cable 7 can adopt any mechanical connection method in the prior art that is suitable for fixing this component. To ensure the stress effect, generally the way of using a ring clamp is adopted, which will not be elaborated here. The way to fix the other end to the main beam 6 can also adopt various structures, that is, detachable fixing can be adopted to facilitate the later adjustment of the tension force. For example, if the main beam 6 is a concrete beam, the transverse tensioning rod can pass through the main beam and complete the tensioning on the other side to form a detachable anchor for later adjustment. If it is a steel box girder, ear plates can be arranged inside the steel box, and a detachable fixation can be formed between the transverse tensioning rod and the ear plates, etc. Of course, it can also be directly welded and fixed to ensure the stability of the structure.

[0028] In this embodiment, the transverse tensioning assembly further includes a tensioning outer sleeve 81 fixed to the main beam and a tensioning inner sleeve 82 sleeved inside the tensioning outer sleeve 81. One end of the transverse tensioning rod 11 is fixedly connected to the tie cable 7 through the tensioning inner sleeve 82, and the other end passes through the tensioning outer sleeve 81 and is fixed at a set position on the main beam 6 after the tensioning is completed. As shown in the figure, the transverse tensioning rod 11 is fixed to the tensioning inner sleeve 82 through mechanical connection structures such as pin ears, and the tensioning inner sleeve 82 is fixedly connected to a ring clamp through mechanical connection methods (generally welding). The ring clamp is a split structure and is clamped on the outer circle of the tie cable, forming a series of fixed connections and can be set as detachable for easy replacement and maintenance. As shown in the figure, the tensioning inner sleeve 82 is axially slidably sleeved inside the tensioning outer sleeve. During the tensioning process, the tensioning outer sleeve and the tensioning inner sleeve shorten and slide along the length direction under the action of the transverse tensioning rod. After the transverse tensioning rod 11 is fixed at the set position on the main beam 6, the tensioning outer sleeve 81 and the tensioning inner sleeve 82 form an effective support for the transverse tensioning rod 11, improving the overall strength of the entire transverse tensioning assembly. During the tensioning process, the tie cable 7 will deform as the transverse tensioning rod 11 moves axially. When the tension of the transverse tensioning rod 11 and the line type of the tie cable 7 meet the design requirements, it is easy to calculate the cable force of the tie cable 7. At this time, the relative positions of the tensioning outer sleeve and the tensioning inner sleeve can be locked by welding or detachably to limit the total length.

[0029] As shown in the figure, both the tensioning outer sleeve 81 and the tensioning inner sleeve 82 are hollow square steel structures, having the ability to bear large torques and ensuring the overall load-bearing capacity of the system.

[0030] In this embodiment, the lateral tensioning assembly further includes a diagonal strut 9. One end of the diagonal strut 9 is fixed at a set position of the main beam 6, and the other end is fixed to the outer sleeve 81 in an inclined upward manner to support it. As shown in the figure, in this structure, a stable triangular support is formed between the diagonal strut 9 and the tensioning outer sleeve 81, thereby ensuring the load-bearing capacity of the entire lateral tensioning assembly and facilitating the stability of the overall structure.

[0031] In this embodiment, the main arch 1 includes two laterally juxtaposed arch ribs. The two tie rods 7 are arranged corresponding to the two arch ribs and are respectively anchored to the arch seats 3 at both ends of the corresponding arch ribs. As shown in the figure, the main arch is formed by the double-arch rib structure, which is conducive to coordinating the load-bearing relationship with their respective tie rods and ensuring the coordinated force of the overall structure. As shown in the figure, both ends of the tie rod 7 are respectively anchored to the arch seats 3 at both ends of the same arch rib. The main beam is located below the main arch and is substantially horizontal with the tie rod 7, forming a through-type tied arch bridge. The overall structure is complete and beautiful, and the load-bearing effect is good. Of course, it does not exclude that bridges other than the through-type use the lateral tensioning tie rod structure of the present invention. For example, in a half-through bridge, a similar technical effect can also be achieved by using this structure, which will not be elaborated here.

[0032] In this embodiment, a plurality of cross braces 2 are fixedly arranged at equal intervals along the length direction between the two arch ribs, and an arch seat cross beam 4 is fixed between the arch seats 3 at the same end of the two arch ribs. The width of the main beam 6 is smaller than the lateral distance between the arch seats 3 at the same end of the two arch ribs. As shown in the figure, the cross brace 2 is made in an X shape and has a triangular load-bearing structure after being fixed to the corresponding arch rib at both ends. While improving the load-bearing capacity, the setting of the cross brace is also conducive to improving the force coordination of the double-arch rib main arch. As shown in the figure, the main beam is located between the arch seats 3 at the same end of the two arch ribs, which is conducive to the arrangement of the tie rod 7 and makes the overall structure have better appearance, coordination and integrity.

[0033] In this embodiment, the main beam 6 is a box beam, and a transverse partition 601 is distributed in the longitudinal direction of the box beam. The transverse partition 601 is a reinforcing structure arranged in the box beam, which is a conventional arrangement and will not be described in detail here; each transverse tensioning assembly has two transverse tensioning rods, and the two transverse tensioning rods are arranged on both sides of the corresponding transverse partition and are respectively fixed on both sides of the transverse partition after tensioning is completed; the tensioning outer sleeve is fixed to the web on the corresponding side of the box beam and is located at the transverse partition; it also includes a pressure-bearing assembly 14 corresponding to the transverse tensioning rod, and the pressure-bearing assembly 14 includes two pressure-bearing vertical plates fixed to the main beam along the tensioning direction and arranged in parallel, and a pressure-bearing horizontal plate fixedly connected to the two pressure-bearing vertical plates. The transverse tension rod is located between the two pressure-bearing vertical plates 1401 and passes through the pressure-bearing horizontal plate 1402; as shown in the figure, the pressure-bearing vertical plate is arranged along the transverse direction of the main beam (tensioning direction), and its fixing method can be directly welded to the inner side of the web (inside the box beam), or it can be welded on the inner side of the web and the side corresponding to the diaphragm. The pressure-bearing horizontal plate and the pressure-bearing vertical plate are generally fixed by welding. Of course, they can also be welded to the side of the diaphragm to ensure the fixing strength, which will not be repeated here; the transverse tension rod 11 passes through the pressure-bearing horizontal plate 1402 and is fixed by a nut, and during the tensioning process, tensioning can be directly formed by rotating the nut, and after completion, it is fixed by welding or locking, which will not be repeated here;

[0034] As shown in the figure, the two transverse tensioning rods are arranged on both sides of the corresponding diaphragm, so that the force on the diaphragm is more balanced and the formation of offset is avoided; at the same time, the position where the tensioning outer sleeve is fixed to the web is located at the diaphragm, which further ensures the force effect and is beneficial to the stability of the overall structure; as shown in the figure, the two transverse tensioning rods 11 are both located inside the tensioning outer sleeve, passing through the web of the main beam 6, and are symmetrically arranged along both sides of the diaphragm of the main beam 6. The transverse tensioning rod 11 is anchored to the pressure-bearing component by bolts and the other end is connected to the tensioning inner sleeve by a pin ear.

[0035] In this embodiment, the two arch ribs are inclined toward the center line of the main beam 6 respectively. Figure 2 As shown, the two arch ribs are inclined upward and inward, forming a support similar to a triangular structure, which has good stability.

[0036] In this embodiment, the tensioning inner sleeve 82 is fixed to the corresponding tie rod cable 7 by the fixing cable clamp 10. After the tensioning is completed, a fixation is formed between the tensioning outer sleeve 81 and the tensioning inner sleeve 82 along the length direction to lock the overall length. As shown in the figure, the fixing cable clamp 10 is a half-ring structure. One half-ring is welded to the tensioning inner sleeve as a whole and together with the other half-ring forms a clamp that clamps the outer circle of the tie rod cable. The two half-rings are connected by bolts, which belongs to an existing mechanical connection structure and will not be elaborated here. After the tensioning is completed, a fixation is formed between the tensioning outer sleeve and the tensioning inner sleeve along the length direction, and together with the transverse tensioning rod 11, it bears the later transverse tension to ensure the stability of the structure. The fixing method can be a detachable type, such as a pin structure, or a welded fixation. The fixation is reliable, but it cannot be adjusted later.

[0037] In this structure, the tie rod cable 7 and the transverse tensioning assembly (including the transverse tensioning rod 11, the tensioning inner sleeve 82, the tensioning outer sleeve 81, the diagonal brace 9, and the fixing cable clamp 10) jointly form a transverse limit constraint with several nodes for the main beam 6. When the main beam 6 undergoes a transverse displacement under the action of an external load, the taut tie rod cable 7 provides a reaction force in the direction opposite to the displacement direction of the main beam 6 to limit the transverse deformation of the main beam 6, thereby significantly increasing the transverse stiffness of the main beam and reducing the transverse amplitude.

[0038] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the purpose and scope of the technical solutions of the present invention, and they should all be covered within the scope of the claims of the present invention.

Claims

1. An arch bridge with transversely tensioned tie cables, Features: It comprises a main arch, a main beam and tie cables anchored at both ends corresponding to the two ends of the main arch respectively, the tie cables are provided with transverse tensioning components applying transverse tensioning force thereto along the length direction, and the force point of the transverse tensioning components is located at the main beam; the tie cables are two symmetrically arranged on both sides of the main beam along the transverse direction and are provided with the transverse tensioning components, and the plane line shape of the tie cables to which the transverse tensioning force is applied is a smooth curve bent toward the center line of the main beam; the transverse tensioning components comprise a transverse tensioning rod, one end of which is fixedly connected to the tie cables, and the other end is fixed to the set position of the main beam after tensioning is completed; the transverse tensioning components also comprise a tensioning outer sleeve fixed to the main beam and a tensioning inner sleeve innerly sleeved in the tensioning outer sleeve, one end of the transverse tensioning rod is fixedly connected to the tie cables through the tensioning inner sleeve, and the other end passes through the tensioning outer sleeve and is fixed to the set position of the main beam after tensioning is completed; The transverse tensioning assembly also includes an oblique brace, one end of which is fixed to a set position of the main beam, and the other end of which is obliquely fixed upward to the tensioning outer sleeve to support it; The main arch comprises two transversely parallel arch ribs, and the two tie cables are arranged corresponding to the two arch ribs and are respectively anchored to the arch seats at the two ends of the corresponding arch ribs.

2. The arch bridge with transverse tensioned tie cables according to claim 1, Features: A plurality of cross braces are evenly distributed and fixedly arranged between the two arch ribs along the length direction, and an arch seat cross beam is fixed between the arch seats at the same end of the two arch ribs, and the width of the main beam is smaller than the lateral distance between the arch seats at the same end of the two arch ribs.

3. The arch bridge with transverse tensioned tie cables according to claim 1, Features: The main beam is a box beam, and a transverse diaphragm is distributed in the longitudinal direction of the box beam; each transverse tensioning assembly has two transverse tensioning rods, and the two transverse tensioning rods are arranged on both sides of the corresponding transverse diaphragm; the tensioning outer sleeve is fixed to the web plate on the corresponding side of the box beam and is located at the transverse diaphragm; It also includes a pressure-bearing component corresponding to the transverse tensioning rod, which includes two pressure-bearing vertical plates fixed to the main beam along the tensioning direction and arranged in parallel, and a pressure-bearing horizontal plate fixedly connected to the two pressure-bearing vertical plates. The transverse tensioning rod is located between the two pressure-bearing vertical plates and passes through the pressure-bearing horizontal plate to complete tensioning and fixing.

4. The arch bridge with transverse tensioned tie cables according to claim 1, Features: The two arch ribs are respectively inclined toward the center line of the main beam.

5. The arch bridge with transverse tensioned tie cables according to claim 1, Features: The tensioning inner sleeve is fixed to the corresponding tie rod cable by a fixing cable clip. After tensioning is completed, the tensioning outer sleeve and the tensioning inner sleeve are fixed along the length direction.

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