Wind-resistant overturn-preventing device for prestressed variable-cross-section continuous beam bridge

Abstract

The utility model discloses a wind-resistant overturn-preventing device for a prestressed variable cross-section continuous beam bridge, which comprises at least one group of overturn-preventing units symmetrically arranged at two ends of a main beam, and each overturn-preventing unit comprises a buckling point anchoring end, an anchor point tensioning end and a cable wind system. The buckling point anchoring end is fixed to the main beam, the anchor point tensioning end is fixed to the bearing platform, the cable wind system comprises a plurality of steel strands and a comb beam plate, one end of each steel strand is anchored to the buckling point anchoring end, the other end of each steel strand is tensioned to the anchor point tensioning end, and a plurality of connecting holes for the steel strands to penetrate through are formed in the comb beam plate in an array mode so that the steel strands can be connected into a whole in series. When the large cantilever of the variable-cross-section continuous beam bridge bears unbalanced temporary loads at the two ends in the construction period, the stability of the main beam is guaranteed, and the anti-overturning risk in the cantilever construction process is reduced. Meanwhile, the cable wind system can prevent the bridge from generating large displacement in the horizontal direction, the potential safety hazard of wind load influence on the bridge is reduced, and therefore the safety of the construction process is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of bridge construction, in particular to a wind-resistant and anti-overturning device for a prestressed variable-section continuous beam bridge. Background Art

[0002] The main construction method of large-span prestressed variable-section beam bridges is cantilever casting. In the process of building large-span variable-section continuous beams in mountainous canyon areas, due to the complexity of the entire construction process and the long period, and the increase in the length of the main beam during cantilever construction, the risk is higher, and symmetrical cantilever casting is required during construction. However, the occurrence of unbalanced bending moment is also inevitable, and the main beam is easily overturned by unbalanced temporary loads at both ends.

[0003] Wind loads produce large bending moments on the pier-beam consolidation. The wind force in most areas is mainly horizontal, while some updrafts and downdrafts occur in mountainous areas. In order to ensure construction safety and quality, an anti-overturning structure is required for the main beam during the construction of large-span cantilever continuous beams in my country.

[0004] At present, there are two main ways to prevent the main beam from overturning: one is temporary consolidation on the pier top, that is, setting temporary consolidation supports on both sides of the permanent supports on the pier top. The other is temporary consolidation beside the pier, which is to set temporary supports next to the pier. However, the above two main beam anti-overturning methods have a single temporary structure and cannot cope with the horizontal displacement caused by wind loads, and the main beam anti-overturning effect is not good. Utility Model Content

[0005] Based on this, it is necessary to provide a prestressed variable-section continuous beam bridge wind-resistant and anti-overturning device to address the problem that the existing main beam anti-overturning method has a single temporary structure and cannot cope with the horizontal displacement caused by wind loads.

[0006] A wind-resistant and anti-overturning device for a prestressed variable-section continuous beam bridge comprises at least one set of anti-overturning units symmetrically arranged at both ends of a main beam, wherein the anti-overturning unit comprises:

[0007] The buckle point anchor end is fixed on the main beam;

[0008] An anchor tensioning end is fixed on the cap, and the anchor tensioning end is closer to the middle of the main beam than the buckle anchoring end; and

[0009] The cable wind system includes a plurality of steel strands and a combing plate, wherein one end of the steel strand is anchored at the buckle anchoring end, and the other end of the steel strand is tensioned at the anchor tensioning end. The combing plate is provided with a plurality of connection holes for the steel strands to pass through, so as to connect the plurality of steel strands in series as a whole.

[0010] In one of the embodiments, the buckle point anchoring end is arranged on the web of the main beam, and the anchor point tensioning end is arranged on the side wall of the pedestal.

[0011] In one embodiment, the main beam is provided with a main beam embedded steel plate, the buckle point anchor end includes an anchor steel plate, the anchor steel plate is welded to the main beam embedded steel plate, and the anchor steel plate is provided with a plurality of anchor holes for anchoring a plurality of the steel strands.

[0012] In one of the embodiments, the buckle point anchor end also includes a plurality of first stiffening plates, and the plurality of first stiffening plates connect the anchor steel plate and the main beam embedded steel plate.

[0013] In one of the embodiments, the plurality of the first stiffening plates and the plurality of the anchor holes are staggeredly arranged on the anchor steel plate.

[0014] In one of the embodiments, a pre-embedded steel plate is provided on the support, and the anchor point tensioning end includes a tensioning steel plate, which is welded to the pre-embedded steel plate of the support, and the tensioning steel plate is provided with a plurality of tensioning holes for tensioning a plurality of the steel strands.

[0015] In one of the embodiments, the anchor point tensioning end further includes a plurality of second stiffening plates, and the plurality of second stiffening plates connect the tensioning steel plate and the cap embedded steel plate.

[0016] In one of the embodiments, a plurality of the second stiffening plates and a plurality of the tensioning holes are staggeredly arranged on the tensioning steel plate.

[0017] In one of the embodiments, after the steel strands pass through the tensioning holes, they are tensioned individually in batches using through-type jacks.

[0018] The above-mentioned prestressed variable-section continuous beam bridge wind-resistant and anti-overturning device connects the main beam and the pedestal through steel strands and applies tension to form a cable wind system. The downward oblique tension formed by the cable wind system can be divided into vertical tension and inward horizontal tension. It can ensure the stability of the main beam when the large cantilever of the variable-section continuous beam bridge is subjected to unbalanced temporary loads at both ends during construction, and reduce the risk of anti-overturning during cantilever construction. At the same time, when the construction is suspended for a long time in winter and affected by strong winds in rivers and canyons, the cable wind system can avoid large horizontal displacements of the bridge, reduce the safety hazards of wind loads to the bridge, and thus ensure the safety of the construction process. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the specific implementation of the utility model, the following will briefly introduce the drawings required for use in the specific implementation. In all the drawings, each element or part is not necessarily drawn according to the actual scale.

[0020] Figure 1 It is a schematic structural diagram of a prestressed variable-section continuous beam bridge wind-resistant and anti-overturning device in one embodiment;

[0021] Figure 2 for Figure 1 Schematic diagram of the structure of the anti-overturning unit.

[0022] Reference numerals:

[0023] 10-main beam, 12-main beam embedded steel plate, 20-anti-overturning unit, 21-buckle point anchor end, 212-anchor steel plate, 214-first stiffening plate, 216-extruded anchor head, 22-anchor point tensioning end, 222-tensioning steel plate, 224-through-type jack, 226-second stiffening plate, 23-cable wind system, 231-steel strand, 232-comb plate, 30-cap, 32-cap embedded steel plate. DETAILED DESCRIPTION

[0024] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation of the utility model is described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific implementation disclosed below.

[0025] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0026] 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.

[0027] See also Figure 1 The wind-resistant and anti-overturning device of a prestressed variable-section continuous beam bridge in one embodiment includes at least one set of anti-overturning units 20 symmetrically arranged at both ends of the main beam 10, and the anti-overturning units 20 connect the main beam 10 and the pedestal 30. In other words, at least one set of anti-overturning units 20 is arranged at both ends of the main beam 10, and the anti-overturning units 20 at both ends of the main beam 10 are symmetrically arranged.

[0028] In one embodiment, four groups of anti-rollover units 20 are arranged on a single lateral side of the main beam 10, forming eight groups of anti-rollover units 20 symmetrically, that is, one end of the main beam 10 has four groups of anti-rollover units 20, and two groups of anti-rollover units 20 are symmetrically arranged on both sides of the end of the main beam 10.

[0029] Please also read Figure 2 In one embodiment, the anti-overturning unit 20 includes a buckle point anchor end 21, an anchor point tension end 22, and a cable wind system 23. The buckle point anchor end 21 is fixed on the main beam 10, the anchor point tension end 22 is fixed on the pedestal 30, and the cable wind system 23 connects the buckle point anchor end 21 and the anchor point tension end 22.

[0030] The anchor tension end 22 is closer to the middle of the main beam 10 relative to the buckle anchor end 21, so that the oblique downward tension generated by the cable wind system 23 can be decomposed into a downward vertical tension and an inward horizontal tension, thereby ensuring the stability of the main beam 10 system. In this embodiment, the buckle anchor end 21 is arranged on the web of the main beam 10, and the anchor tension end 22 is arranged on the side wall of the pedestal 30.

[0031] In one embodiment, the cable wind system 23 includes a plurality of steel strands 231 and a combing plate 232 , one end of the plurality of steel strands 231 is anchored at the buckle anchor end 21 , and the other end of the plurality of steel strands 231 is tensioned at the anchor tension end 22 .

[0032] In one embodiment, the main beam 10 is provided with a main beam embedded steel plate 12, and the buckle point anchor end 21 includes an anchor steel plate 212, which is welded to the main beam embedded steel plate 12, and the anchor steel plate 212 is provided with a plurality of anchor holes for anchoring the steel strand 231. After the end of the steel strand 231 passes through the anchor hole, the end of the steel strand 231 can be anchored by squeezing the anchor head 216.

[0033] Furthermore, the anchoring steel plate 212 is perpendicular to the axis of the steel strand 231, so that after the steel strand 231 passes through the anchoring hole, the axis of the steel strand 231 coincides with the axis of the anchoring hole, thereby preventing the opening of the anchoring hole from cutting the steel strand 231 and causing damage to the steel strand 231.

[0034] In one embodiment, the buckle anchor end 21 further includes a plurality of first stiffening plates 214, which connect the anchor steel plate 212 and the main beam embedded steel plate 12 to ensure the strength of the connection between the anchor steel plate 212 and the main beam embedded steel plate 12. The plurality of first stiffening plates 214 and the plurality of anchor holes are staggered on the anchor steel plate 212 to avoid collision and interference between the steel strand 231 and the first stiffening plates 214, which may cause damage to the steel strand 231.

[0035] In one embodiment, a cap embedded steel plate 32 is provided on the cap 30 , and the anchor tensioning end 22 includes a tensioning steel plate 222 . The tensioning steel plate 222 and the cap embedded steel plate 32 are welded, and a plurality of tensioning holes for tensioning the steel strands 231 are provided on the tensioning steel plate 222 .

[0036] Specifically, after the steel strands 231 pass through the tensioning holes, they are tensioned in batches using the through-type jacks 224. After the upper steel strands 231 of the tensioning steel plate 222 are tensioned, the lower steel strands 231 are tensioned until all the steel strands 231 are tensioned.

[0037] In one embodiment, the tensioning steel plate 222 is perpendicular to the pre-embedded steel plate 32 of the base, so that after the steel strand 231 passes through the tensioning hole, the axis of the steel strand 231 coincides with the axis of the tensioning hole, thereby preventing the opening of the tensioning hole from cutting the steel strand 231 and causing damage to the steel strand 231.

[0038] In one embodiment, the anchor tensioning end 22 further includes a plurality of second stiffening plates 226, which connect the tensioning steel plate 222 and the cap embedded steel plate 32 to ensure the strength of the connection between the tensioning steel plate 222 and the cap embedded steel plate 32. The plurality of second stiffening plates 226 and the plurality of tensioning holes are staggered on the tensioning steel plate 222 to avoid collision and interference between the steel strands 231 and the second stiffening plates 226, which may cause damage to the steel strands 231.

[0039] In one embodiment, a plurality of connection holes are arrayed on the combing plate 232 for the steel strands 231 to pass through. The combing plate 232 is located in the middle of the steel strands 231. The combing plate 232 is used to connect the plurality of steel strands 231 in series as a whole, thereby reducing fatigue damage caused by continuous vibration of a single prestressed steel strand 231 due to wind load.

[0040] In one embodiment, each cable wind system 23 has four steel strands 231, and the combing plate 232 has four connection holes arranged in two rows and two columns, and the four steel strands 231 are respectively inserted into the four connection holes. The anchoring steel plate 212 has four anchor holes arranged in an array corresponding to the steel strands 231, and the tensioning steel plate 222 has four tensioning holes arranged in an array corresponding to the steel strands 231.

[0041] The above-mentioned prestressed variable cross-section continuous beam bridge wind-resistant and anti-overturning device connects the main beam 10 and the pedestal 30 through the steel strand 231 and applies tension to form a cable wind system 23, which can ensure the stability of the main beam 10 when the large cantilever of the variable cross-section continuous beam bridge is subjected to unbalanced temporary loads at both ends during construction, and reduce the risk of anti-overturning during cantilever construction. At the same time, when the long-term shutdown in winter is affected by strong winds in the river and canyon, the cable wind system 23 can avoid large horizontal displacement of the bridge, reduce the safety hazards of wind loads to the bridge, and thus ensure the safety of the construction process.

[0042] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention.

Claims

1. A wind-resistant and anti-overturning device for a prestressed variable-section continuous beam bridge, characterized in that: It comprises at least one set of anti-overturning units symmetrically arranged at both ends of the main beam, and the anti-overturning unit comprises: The buckle point anchor end is fixed on the main beam; An anchor tensioning end is fixed on the cap, and the anchor tensioning end is closer to the middle of the main beam than the buckle anchoring end; and The cable wind system includes a plurality of steel strands and a combing plate, wherein one end of the steel strand is anchored at the buckle anchoring end, and the other end of the steel strand is tensioned at the anchor tensioning end. The combing plate is provided with a plurality of connection holes for the steel strands to pass through, so as to connect the plurality of steel strands in series as a whole.

2. The wind-resistant and anti-overturning device for prestressed variable-section continuous beam bridge according to claim 1 is characterized in that: The buckle point anchoring end is arranged on the web of the main beam, and the anchor point tensioning end is arranged on the side wall of the pedestal.

3. The wind-resistant and anti-overturning device for prestressed variable-section continuous beam bridge according to claim 1 is characterized in that: The main beam is provided with a main beam embedded steel plate, the buckle point anchor end includes an anchor steel plate, the anchor steel plate is welded to the main beam embedded steel plate, and the anchor steel plate is provided with a plurality of anchor holes for anchoring a plurality of the steel strands.

4. The wind-resistant and anti-overturning device for prestressed variable-section continuous beam bridge according to claim 3 is characterized in that: The buckle point anchoring end also includes a plurality of first stiffening plates, and the plurality of first stiffening plates connect the anchoring steel plate and the main beam embedded steel plate.

5. The wind-resistant and anti-overturning device for prestressed variable-section continuous beam bridge according to claim 4 is characterized in that: The plurality of first stiffening plates and the plurality of anchor holes are staggeredly arranged on the anchor steel plate.

6. The wind-resistant and anti-overturning device for a prestressed variable-section continuous beam bridge according to any one of claims 1 to 5, characterized in that: The pedestal is provided with a pedestal embedded steel plate, the anchor point tensioning end comprises a tensioning steel plate, the tensioning steel plate is welded to the pedestal embedded steel plate, and the tensioning steel plate is provided with a plurality of tensioning holes for tensioning a plurality of the steel strands.

7. The wind-resistant and anti-overturning device for prestressed variable-section continuous beam bridge according to claim 6 is characterized in that: The anchor point tensioning end also includes a plurality of second stiffening plates, and the plurality of second stiffening plates connect the tensioning steel plate and the cap embedded steel plate.

8. The wind-resistant and anti-overturning device for prestressed variable-section continuous beam bridge according to claim 7 is characterized in that: The plurality of the second stiffening plates and the plurality of the tensioning holes are staggeredly arranged on the tensioning steel plate.

9. The wind-resistant and anti-overturning device for prestressed variable-section continuous beam bridge according to claim 6 is characterized in that: After the steel strands pass through the tensioning holes, they are tensioned in batches individually using through-hole jacks.

Images