Cable-stayed arch bridge

Abstract

The present invention relates to a cable-stayed arch bridge, comprising: an arch bridge body, including an arch rib and arch feet at both ends of the arch rib; two bridge towers, respectively arranged at both ends of the arch rib, the bridge towers are placed on the arch feet at the same end and the bridge towers are inclined outward along the longitudinal bridge direction; a tensioning component, including an upper cable segment respectively arranged above the two ends of the arch rib and a lower cable segment arranged below the arch rib, one end of the two upper cable segments is respectively connected to the bridge tower at the same end, and the other end is respectively connected to the two ends of the lower cable segment; a supporting component, the two ends of which are respectively connected to the lower cable segment and the arch rib, for supporting the arch rib. The bridge tower generates an inclined downward pressure on the foundation along its own extension direction, and the horizontal component of the pressure can balance the outward horizontal thrust generated by the arch rib on the arch foot; the bridge towers at both ends are inclined outward to tighten the tensioning component, and the tensioning component provides a supporting force to the arch rib through the supporting component, and the supporting force can strengthen the bridge and improve the bearing capacity of the bridge.

Description

Technical Field

[0001] The invention relates to the field of bridge design, in particular to a cable-stayed arch bridge. Background Art

[0002] An ordinary top-bearing arch bridge includes an arch rib and a foundation at the two ends of the arch foot. Specifically, it is a thrust structure, that is, the arch rib generates thrust on the two ends of the arch foot, and the thrust is mainly borne by the arch foot and the foundation at the arch foot. However, due to the limitations of the use conditions, top-bearing arch bridges generally cannot be equipped with tie rods, so it is impossible to balance or reduce the thrust at the arch foot by tensioning. This requires the foundation itself to have high strength and support, and the scale and volume of the foundation at the arch foot need to be increased during construction; in addition, with the increase of the span of the arch bridge and the decrease of the span-rise ratio, the stiffness of the arch rib becomes smaller and smaller, the force tends to be unfavorable and easy to deform, and the bearing capacity decreases. Therefore, the required arch rib section thickness becomes larger and larger, which seriously affects the economy and aesthetics of the structure. Summary of the invention

[0003] Based on this, it is necessary to provide a cable-stayed arch bridge to address the problems that the arch feet of traditional top-supported arch bridges are subjected to large thrust, are easily deformed and have low bearing capacity.

[0004] A cable-stayed arch bridge, comprising:

[0005] The arch bridge body comprises an arch rib and arch feet at both ends of the arch rib;

[0006] Two bridge towers are respectively arranged at two ends of the arch rib, the bridge towers are placed on the arch feet at the same end and the bridge towers are inclined outwards along the longitudinal direction of the bridge;

[0007] The tensioning component comprises an upper cable section respectively arranged above the two ends of the arch rib and a lower cable section respectively arranged below the arch rib, one end of the two upper cable sections is respectively connected to the bridge tower at the same end, and the other end is respectively connected to the two ends of the lower cable section;

[0008] The supporting component has two ends respectively connected to the lower cable section and the arch rib, and is used to support the arch rib.

[0009] The above-mentioned cable-stayed arch bridge has at least the following beneficial technical effects:

[0010] (1) The bridge towers at both ends of the arch rib, which are tilted outward along the longitudinal bridge direction, exert a downward pressure on the foundation along their own extension direction. The horizontal component of this pressure can balance the horizontal thrust outward generated by the arch rib on the arch foot. Since the tension components are prestressed during installation and the bridge towers themselves have a tendency to naturally tilt outward along the longitudinal bridge direction, the outward tilt of the bridge towers at both ends further tightens the tension components. The tension components provide a larger upward support force to the arch rib through the supporting components. This support force can offset part of the deadweight of the arch rib, thereby reducing the downward vertical thrust generated by the arch rib on the arch foot. After the horizontal and vertical thrusts of the arch rib on the arch foot at both ends are reduced, the strength and support requirements of the foundation at the arch foot are directly reduced, thereby reducing the construction scale and volume of the foundation at the arch foot and reducing the construction cost.

[0011] (2) The tensioned tensioning components provide an upward support force to the arch ribs through the supporting components. This support force can improve the stiffness of the arch ribs themselves and the stress conditions of the arch ribs, reducing the possibility of deformation. At the same time, this upward support force also helps to improve the bearing capacity of the arch ribs. Overall, the bridge is strengthened and the bearing capacity of the bridge is improved. Even if the span of the arch bridge increases or the span-rise ratio decreases, there is no need to design a larger arch rib section thickness, which reduces the construction cost and ensures the overall beauty of the bridge.

[0012] In one embodiment, the connection point between the upper cable segment and the lower cable segment is located inside the arch rib.

[0013] In one of the embodiments, the support component includes a plurality of support rods distributed along the longitudinal bridge direction, and two ends of the support rods are respectively connected to the lower cable-through section and the arch rib.

[0014] In one embodiment, the support rod is arranged vertically.

[0015] In one of the embodiments, the tensioning component further includes two back cable assemblies, which are respectively arranged on the sides of the two bridge towers facing away from the arch ribs, and one end of the back cable assembly is fixed to the bridge tower, and the other end is fixed to the ground.

[0016] In one embodiment, the back cable assembly includes a back cable and a ground anchor, the ground anchor is fixed to the ground, one end of the back cable is connected to the ground anchor, and the other end is connected to a side surface of the bridge tower facing away from the arch rib.

[0017] In one of the embodiments, the bridge tower comprises two tower bodies symmetrically arranged in the transverse direction of the bridge, and the two tower bodies are connected to the tower bodies on the same side of the other bridge tower through the tensioning member.

[0018] In one embodiment, the two tower bodies are respectively inclined toward the outside of the transverse bridge direction of the arch rib.

[0019] In one embodiment, the arch bridge body and the bridge tower are one of a steel structure, a concrete body or a combination of a steel structure and a concrete body.

[0020] In one embodiment, the upper cable segment and the lower cable segment are steel wires or steel strands.

[0021] In one embodiment, the arch foot is fixed on a pile foundation or an expanded foundation. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A front view of a cable-stayed arch bridge is provided for one embodiment of the present invention;

[0023] Figure 2 for Figure 1 Provides a top view of the cable-stayed arch bridge.

[0024] In the figure, 100 is the arch bridge body, 110 is the arch rib, 120 is the arch foot,

[0025] 200, bridge tower, 210, tower body,

[0026] 300, tensioning component, 310, upper cable section, 320, lower cable section, 330, back cable assembly, 331, back cable, 332, ground anchor,

[0027] 400. Support component, 410. Support rod. DETAILED DESCRIPTION

[0028] The present invention will be further described below in conjunction with the accompanying drawings.

[0029] To facilitate understanding of the present invention, the present invention will be described more fully below with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the accompanying drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. Those of ordinary skill in the art will recognize that changes and improvements may be made to the various embodiments described herein without departing from the scope of the present invention as defined by the appended claims. In addition, for the sake of clarity and brevity, descriptions of well-known functions and configurations may be omitted.

[0030] It should be understood that when an element is referred to as being “fixed to” another element, it may be directly on the other element or there may also be an intervening element; when an element is considered to be “connected to” another element, it may be directly connected to the other element or there may also be an intervening element.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0032] like Figure 1 and Figure 2 As shown, in one embodiment of the present invention, a cable-stayed arch bridge is provided, comprising:

[0033] The arch bridge body 100 includes an arch rib 110 and arch feet 120 at both ends of the arch rib 110;

[0034] Two bridge towers 200 are respectively arranged at two ends of the arch rib 110, the bottom of the bridge tower 200 is placed on the arch foot 120 at the same end and the bridge tower 200 is inclined outward along the longitudinal direction of the bridge;

[0035] The tensioning member 300 includes an upper cable segment 310 disposed above both ends of the arch rib 110 and a lower cable segment 320 disposed below the arch rib 110. One end of the two upper cable segments 310 is connected to the bridge tower 200 at the same end, and the other end is connected to both ends of the lower cable segment 320.

[0036] The supporting component 400 has two ends respectively connected to the lower cable-passing section 320 and the arch rib 110 , and is used to support the arch rib 110 .

[0037] In this embodiment, the upper cable section 310 and the lower cable section 320 together form a tensioning member 300, and the tensioning member 300 connects the inclined bridge towers 200 at both ends. Figure 1 The connection shown forms a tensioning member 300 ; of course, the tensioning member 300 may also be a complete cable strip, and the upper cable segment 310 and the lower cable segment 320 are different parts of the tensioning member 300 .

[0038] The force F generated by the arch rib 110 on the arch foot 120 can be decomposed into a horizontal thrust F1 and a vertical thrust F2 in the horizontal and vertical directions. In this embodiment, the bridge tower 200 inclined outward along the longitudinal bridge direction generates an inclined downward pressure P on the foundation along its own extension direction, and the pressure P can be decomposed into a horizontal component P1 and a vertical component P2, wherein the horizontal component P1 can balance the outward horizontal thrust F1 applied by the arch rib 110 to the arch foot 120; since the tensioning member 300 is prestressed during installation, and the bridge tower 200 itself has a tendency to naturally tilt outward along the longitudinal bridge direction, the bridge towers 200 at both ends tilt outward at the same time to further fully tighten the tensioning member 300, and the tensioning member 300 provides a large upward support force to the arch rib 110 through the support member 400, and the support force can offset a part of the deadweight of the arch rib 110, thereby reducing the downward vertical thrust F2 generated by the arch rib 110 on the arch foot 120. After the arch ribs 110 reduce the horizontal thrust and vertical thrust on the arch feet 120 at both ends, the strength and support requirements of the foundation at the arch feet 120 are directly reduced, thereby reducing the building scale and volume of the foundation at the arch feet 120 and reducing the construction cost.

[0039] The tensioned tensioning member 300 provides an upward support force to the arch rib 110 through the support member 400, which can improve the rigidity of the arch rib 110 itself and the stress condition of the arch rib 110, and reduce the possibility of deformation; at the same time, the upward support force also helps to improve the bearing capacity of the arch rib 110. Overall, the bridge is strengthened and the bearing capacity of the bridge is improved. Even if the span of the arch bridge increases or the span-rise ratio decreases, it is not necessary to design a larger cross-sectional thickness of the arch rib 110, which reduces the construction cost and ensures the overall beauty of the bridge.

[0040] refer to Figure 1 and Figure 2 In some embodiments, the connection point between the upper cable segment 310 and the lower cable segment 320 is located inside the arch rib 110. At this time, the position where the tensioning component 300 passes through the arch rib 110 is set inside the arch rib 110, and the tensioning component 300 passes through the arch rib 110.

[0041] This embodiment can make full use of the space of the arch rib 110 itself to pass the tensioning member 300, and no extra space needs to be reserved for setting the tensioning member 300, which saves space and facilitates installation and construction. In some other embodiments, the connection point of the upper cable section 310 and the lower cable section 320 is located on the side of the arch rib 110 in the transverse direction of the bridge, and the tensioning member 300 needs to occupy the space outside the arch rib 110.

[0042] refer to Figure 1In some embodiments, the support component 400 includes a plurality of support rods 410 distributed along the longitudinal bridge direction, and the two ends of the support rods 410 are respectively connected to the lower cable section 320 and the arch rib 110. After the tensioning component 300 is tightened, the arch rib 110 is supported upward through the support rods 410. The support force can directly offset a part of the deadweight of the arch rib 110, thereby reducing the downward vertical thrust F2 generated by the arch rib 110 on the arch foot 120; at the same time, the upward support force can also improve the stiffness of the arch rib 110 and the load-bearing capacity of the arch rib 110 itself. Preferably, the support rods 410 are arranged vertically, and the vertically arranged support rods 410 can completely transmit the support force vertically to the arch rib 110, and the support effect is better.

[0043] Continue to refer Figure 1 In some embodiments, the tensioning member 300 further includes two back cable assemblies 330, which are respectively arranged on the side of the two bridge towers 200 facing away from the arch rib 110, and one end of the back cable assembly 330 is fixed to the bridge tower 200, and the other end is fixed to the ground. After being pre-tightened, the back cable assembly 330 can apply tension to the bridge tower 200, so that the bridge tower 200 further tilts outward along the longitudinal bridge direction, thereby fully increasing the tension in the tensioning member 300, so that the upward support force of the support member 400 on the arch rib 110 is greater.

[0044] In some embodiments, the back cable assembly 330 includes a back cable 331 and a ground anchor 332. The ground anchor 332 is fixed to the ground. One end of the back cable 331 is connected to the ground anchor 332, and the other end is connected to the side surface of the bridge tower 200 facing away from the arch rib 110. The ground anchor 332 has a strong anchoring force, so that the back cable 331 can be more firmly fixed to the ground through the ground anchor 332, ensuring the stability of the installation state.

[0045] In some other embodiments, the back cable assembly 330 may also adopt other structures, for example, it may be a plurality of steel cables arranged side by side, which is not limited here.

[0046] In some embodiments, the bridge tower 200 includes two tower bodies 210 symmetrically arranged in the transverse direction of the bridge, and the two tower bodies 210 are respectively connected to the tower body 210 on the same side of the other end of the arch rib 110 through a tensioning member 300. The two tower bodies 210 symmetrically arranged in the transverse direction of the bridge have a stable structure and are more stable than a single tower body 210.

[0047] Preferably, reference Figure 2 The tower body 210 is inclined outwardly toward the cross bridge of the arch rib 110. The tensioning member 300 is also inclined outwardly toward the cross bridge of the arch rib 110, increasing the width of the tensioning member 300 in the cross bridge direction, thereby increasing the area of ​​the arch rib 110 supported by the supporting member 400, providing more stable support for the arch rib 110 and better improving the stress condition of the arch rib 110 itself, so that the bridge has a stronger ability to resist deformation and bear loads.

[0048] Of course, in some other embodiments, the tower body 210 may also remain upright in the transverse direction of the arch rib 110, which is not limited here.

[0049] Preferably, the arch bridge body 100 and the bridge tower 200 are one of steel structures, concrete bodies or a combination of steel structures and concrete bodies. The arch ribs 110 and the bridge tower 200 constructed with the above materials have good stability and durability, and can improve the service life of the bridge to a certain extent.

[0050] In some embodiments, the upper cable segment 310 and the lower cable segment 320 are steel wires or steel strands, which have high strength and tensile strength, and can extend the overall service life.

[0051] In some embodiments, the arch foot 120 is fixed to a foundation. The foundation provides a fixed support for the arch foot 120, which can prevent the arch foot 120 from sliding along the ground to a certain extent, thereby improving the safety of the arch bridge. Preferably, the foundation is a pile foundation or an expanded foundation.

[0052] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0053] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A cable-stayed arch bridge, characterized in that: include: The arch bridge body comprises an arch rib and arch feet at both ends of the arch rib; Two bridge towers are respectively arranged at two ends of the arch rib, the bridge towers are placed on the arch feet at the same end and the bridge towers are inclined outwards along the longitudinal direction of the bridge; The tensioning member comprises an upper cable segment respectively arranged above the two ends of the arch rib and a lower cable segment respectively arranged below the arch rib, one end of the two upper cable segments is respectively connected to the bridge tower at the same end, and the other end is respectively connected to the two ends of the lower cable segment, and the tensioning member is also inclined outwardly toward the transverse bridge of the arch rib; A supporting component, two ends of which are respectively connected to the lower cable section and the arch rib, for supporting the arch rib, the supporting component comprising a plurality of supporting rods distributed along the longitudinal bridge direction, two ends of the supporting rods being respectively connected to the lower cable section and the arch rib; The tensioning component also includes two back cable assemblies, which are respectively arranged on the sides of the two bridge towers facing away from the arch ribs, one end of the back cable assembly is fixed to the bridge tower, and the other end of the back cable assembly is fixed to the ground.

2. The cable-stayed arch bridge according to claim 1, characterized in that: The connection point between the upper cable section and the lower cable section is located inside the arch rib.

3. The cable-stayed arch bridge according to claim 1, characterized in that: The support rod is arranged vertically.

4. The cable-stayed arch bridge according to claim 1, characterized in that: The back cable assembly comprises a back cable and a ground anchor, wherein the ground anchor is fixed to the ground, one end of the back cable is connected to the ground anchor, and the other end of the back cable is connected to a side surface of the bridge tower facing away from the arch rib.

5. The cable-stayed arch bridge according to claim 1, characterized in that: The bridge tower comprises two tower bodies which are symmetrically arranged in the transverse direction of the bridge, and the two tower bodies are connected via the tensioning member on the same side of the other bridge tower.

6. The cable-stayed arch bridge according to claim 5, characterized in that: The two tower bodies are respectively inclined toward the outer sides of the transverse bridge direction of the arch rib.

7. The cable-stayed arch bridge according to claim 1, characterized in that: The arch bridge body and the bridge tower are one of a steel structure, a concrete body or a combination of a steel structure and a concrete body.

8. The cable-stayed arch bridge according to claim 1, characterized in that: The upper cable section and the lower cable section are steel wires or steel strands.

9. The cable-stayed arch bridge according to claim 1, characterized in that: The arch foot is fixed on a pile foundation or an enlarged foundation.

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