Arch bridge and anti-pushing structure thereof

Abstract

The arch bridge comprises a first side and a second side which are opposite to each other in the span direction of the arch bridge, the first side and the second side are provided with bearing platforms, and through holes extending in the span direction are formed in the bearing platforms; the anti-pushing structure comprises a pre-stressed anchor cable and a pre-stressed anchor cable, the transition piece is located between the end of the pre-stressed anchor cable and the bearing platform, the section size of the transition piece in the direction perpendicular to the span is larger than that of the pre-stressed anchor cable, and a mounting hole used for allowing the pre-stressed anchor cable to penetrate through is formed in the transition piece. The ends of the pre-stressed anchor cables penetrate through the through holes of the bearing platforms on the first side and the second side in the span direction and meanwhile penetrate through the mounting holes of the transition pieces. And the anchorage device is used for anchoring the end part of the pre-stressed anchor cable positioned outside the transition piece. The construction period can be effectively shortened, and the construction cost can be effectively reduced; and the anti-pushing structure is high in stability and reasonable in stress, and the used prestress technology is mature, easy to construct and wide in application.

Description

Technical Field

[0001] The utility model relates to the technical field of bridge reinforcement, in particular to an arch bridge and an anti-thrust structure thereof. Background Art

[0002] Arch bridges, which originated in the middle and late Eastern Han Dynasty, have a history of more than 1,800 years. They are a type of bridge with classical characteristics. Arch bridges are composed of arch rings and arch abutments. The above structural composition of arch bridges makes its force form: converting vertical force into horizontal thrust. Arch bridges account for a large proportion of the existing classical famous bridges. Most of them are made of stone masonry, with a small span, and most of them are pedestrian arch bridges. With the development of society, the classic bridge type of arch bridge is also constantly changing. According to the different spatial positions of the bridge deck, it is subdivided into top-bearing, middle-bearing and bottom-bearing arch bridges. Combined with the force system, it is divided into simple system, combined system and arch bridge. With the continuous advancement of engineering technology, the span and scale of arch bridges are also increasing, and correspondingly, higher requirements are put forward for the structural force.

[0003] At present, the main material type for newly built arch bridges is reinforced concrete, with a small amount of stone or steel structures. For reinforced concrete arch bridges, the arch ring is the main load-bearing structure, which converts the vertical force into horizontal thrust and transmits it to the arch foot, which then relies on the foundation to resist this part of the horizontal thrust. The foundation of arch bridges is mostly gravity piers or pile-column piers. In order to resist the horizontal thrust transmitted from the main arch ring, the foundation needs to be enlarged or the pile foundation needs to be lengthened, which increases the cost and extends the construction period, which is not conducive to the economic aspects of the project.

[0004] Therefore, it is necessary to propose an anti-thrust structure of an arch bridge to solve at least one of the above problems. Utility Model Content

[0005] In view of the defects existing in the prior art, an arch bridge and an anti-thrust structure thereof are provided in the embodiments of the utility model, which can increase the stability of the arch bridge, and can effectively shorten the construction period and reduce the construction cost.

[0006] The specific technical solution of the implementation mode of the utility model is:

[0007] An anti-thrust structure of an arch bridge, the anti-thrust structure is used to be installed on the arch bridge, the arch bridge includes a first side and a second side opposite to each other along the span direction, the first side and the second side are respectively provided with a cap, and the caps of the first side and the second side are respectively provided with a through hole extending along the span direction; the anti-thrust structure of the arch bridge includes:

[0008] A prestressed anchor cable, wherein the prestressed anchor cable extends longitudinally along the span direction;

[0009] A transition piece, the transition piece is located between the end of the prestressed anchor cable and the cap, the cross-sectional dimension of the transition piece in a direction perpendicular to the span is larger than the cross-sectional dimension of the prestressed anchor cable, the transition piece is provided with a mounting hole for passing the prestressed anchor cable, the end of the prestressed anchor cable passes through the through holes of the caps on the first side and the second side along the span direction and passes through the mounting hole of the transition piece at the same time;

[0010] Anchorage, wherein the anchorage is used to anchor the end of the prestressed anchor cable located outside the transition piece.

[0011] In a preferred embodiment, the transition piece includes any one of the following: a crossbeam, a steel plate.

[0012] In a preferred embodiment, the transition piece is a cross beam having an inner side surface close to the support platform and an outer side surface opposite to the inner side surface, and the cross-sectional area of ​​the inner side surface gradually decreases to the cross-sectional area of ​​the outer side surface.

[0013] In a preferred embodiment, an end concrete encapsulation structure is provided on the outer side of the anchor.

[0014] In a preferred embodiment, the anti-thrust structure of the arch bridge also includes a protective tube, which is sleeved on the outside of the prestressed anchor cable, and the two ends of the protective tube are respectively flush with the outer side of the pedestal, and the end of the prestressed anchor cable extends to the outside of the protective tube.

[0015] In a preferred embodiment, the protection tube comprises: a hollow corrugated tube.

[0016] In a preferred embodiment, a middle concrete encapsulation structure is disposed on the outer circumference of the protection tube, and the cross-section of the middle concrete encapsulation structure is any one of the following: circular or rectangular.

[0017] In a preferred embodiment, the line shape of the prestressed anchor cable is a straight line, and the length of the prestressed anchor cable is within 50 meters.

[0018] In a preferred embodiment, the prestressed anchor cables include multiple groups, and the multiple groups of prestressed anchor cables are arranged at equal intervals in the transverse direction of the bridge.

[0019] In a preferred embodiment, the spacing between two adjacent groups of prestressed anchor cables in the transverse direction of the bridge is more than 3 meters.

[0020] An arch bridge comprises a first side and a second side opposite to each other along its span direction, the first side and the second side are respectively provided with abutments, the arch bridge comprises an anti-thrust structure of any of the above-mentioned arch bridges, and the anti-thrust structure is connected between the abutments.

[0021] The technical solution of the utility model has the following significant beneficial effects:

[0022] The anti-thrust structure of the arch bridge provided in the embodiment of the present application generates a horizontal inward pulling force by symmetrically tensioning the caps on both sides of the arch foot with prestressed anchor cables, which can effectively resist the horizontal outward thrust generated by the main arch of the arch bridge on the arch foot, replacing the traditional practice of resisting the horizontal thrust of the arch bridge by increasing the number and length of pile foundations, effectively shortening the construction period and reducing the project cost. The anti-thrust structure provided in the embodiment of the present application has strong stability and reasonable force, and the prestressing process is mature, easy to construct, and widely used.

[0023] With reference to the following description and drawings, specific embodiments of the present invention are disclosed in detail, indicating the manner in which the principles of the present invention can be adopted. It should be understood that the embodiments of the present invention are not limited in scope. Within the spirit and scope of the appended claims, the embodiments of the present invention include many changes, modifications and equivalents. Features described and / or shown for one embodiment can be used in one or more other embodiments in the same or similar manner, combined with features in other embodiments, or replace features in other embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings described herein are only for explanation purposes and are not intended to limit the scope of the present invention in any way. In addition, the shapes and proportional dimensions of the components in the drawings are only for illustration purposes to help understand the present invention, and are not intended to specifically limit the shapes and proportional dimensions of the components of the present invention. Under the guidance of the present invention, those skilled in the art can select various possible shapes and proportional dimensions to implement the present invention according to specific circumstances.

[0025] Figure 1 A schematic diagram of the structure of an arch bridge provided in an embodiment of the present application;

[0026] Figure 2 A schematic structural diagram of an anti-thrust structure of an arch bridge provided in an embodiment of the present application;

[0027] Figure 3 for Figure 2 Sectional view at AA in the middle;

[0028] Figure 4 for Figure 2 Cross-sectional view at the middle BB.

[0029] Reference numerals of the present application:

[0030] 1. Prestressed anchor cable;

[0031] 2. Anchorage;

[0032] 3. Platform;

[0033] 4. Beam;

[0034] 5. Bellows;

[0035] 6. Central concrete encapsulation structure. DETAILED DESCRIPTION

[0036] The technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. After reading the present invention, various equivalent forms of modifications to the present invention by those skilled in the art fall within the scope defined by the claims attached to this application.

[0037] It should be noted that when an element is referred to as being "disposed on" 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", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0038] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0039] The existing technology mainly increases the number and length of pile foundations to resist the horizontal thrust of arch bridges, but the cost is high and the construction period is long, which is not conducive to ensuring the economic efficiency of the project. In addition, when underground continuous walls or pile foundations are used in the existing technology, there are also problems such as complex construction, high construction precision requirements, and high cost. In addition, some existing technologies have high requirements on geological conditions by changing the number and size of piles, which has great limitations and a narrow scope of application.

[0040] The utility model provides an arch bridge and an anti-thrust structure thereof, which improve the stability of the arch bridge and can effectively shorten the construction period and reduce the project cost; and the anti-thrust structure itself has strong stability and reasonable force, and the prestressed technology used is mature, easy to construct, and widely used.

[0041] Please refer to Figures 1 to 4In the embodiment of the present application specification, an anti-thrust structure of an arch bridge is provided, and the anti-thrust structure is used to be installed on the arch bridge. The arch bridge includes a first side and a second side opposite to each other along its span direction, and the first side and the second side are respectively provided with a cap 3, and the cap 3 of the first side and the second side are respectively provided with a through hole extending along the span direction; the anti-thrust structure of the arch bridge includes: a prestressed anchor cable 1, and the prestressed anchor cable 1 extends longitudinally along the span direction; a transition piece, the transition piece is located between the end of the prestressed anchor cable 1 and the cap 3, the cross-sectional size of the transition piece in a direction perpendicular to the span direction is larger than the cross-sectional size of the prestressed anchor cable 1, and the transition piece is provided with a mounting hole for passing the prestressed anchor cable 1, and the end of the prestressed anchor cable 1 passes through the through holes of the cap 3 of the first side and the second side along the span direction and passes through the mounting hole of the transition piece at the same time; an anchor 2, the anchor 2 is used to anchor the end of the prestressed anchor cable 1 located outside the transition piece.

[0042] The anti-thrust structure of the arch bridge provided in the embodiment of the present application generates a horizontal inward pulling force by symmetrically tensioning the caps 3 on both sides of the arch foot through the prestressed anchor cable 1, which can effectively resist the horizontal outward thrust generated by the main arch of the arch bridge on the arch foot, replacing the traditional practice of resisting the horizontal thrust of the arch bridge by increasing the number and length of pile foundations, effectively shortening the construction period and reducing the project cost. The anti-thrust structure provided in the embodiment of the present application has strong stability and reasonable force, and the prestressing process is mature, easy to construct, and widely used.

[0043] In this embodiment, the prestressed anchor cables 1 include multiple groups, and the multiple groups of prestressed anchor cables 1 are arranged at equal intervals in the transverse direction of the bridge. Specifically, the spacing between two adjacent groups of prestressed anchor cables 1 in the transverse direction of the bridge is more than 3 meters. Among them, the number of prestressed anchor cables 1 arranged at equal intervals in the transverse direction of the bridge can be determined according to the transverse width of the abutment 3, and this application does not make a sole limitation here.

[0044] In this embodiment, the line shape of the prestressed anchor cable 1 is a straight line, and the length of the prestressed anchor cable 1 is within 50 meters. That is to say, the push-pull structure of the arch bridge provided in this application is used when the length of the prestressed anchor cable 1 does not exceed 50m. When it exceeds 50m, the technical means to be taken are different from those in this application.

[0045] In this embodiment, a transition piece is provided between the end of the prestressed anchor cable 1 and the pedestal 3. The cross-sectional size of the transition piece is the same as that of the prestressed anchor cable 1. The use of the transition piece with a larger cross-section can reduce the pressure exerted by the tensile force on the pedestal 3, preventing it from being damaged due to excessive local force, thereby effectively protecting the pedestal 3 and extending the service life of the pedestal 3.

[0046] Specifically, the transition piece may include any one of the following: a crossbeam 4, a steel plate.

[0047] In this embodiment, the transition piece can be in the form of a cross beam 4, can be in the form of a steel plate, and of course can be in other forms. In this embodiment, the transition piece is mainly in the form of a cross beam 4 as an example for illustration. When the transition piece is in other forms, it can be adaptively replaced with reference to this application, and this application will not be described one by one here.

[0048] Please refer to Figure 2 and Figure 4 When the transition piece is a cross beam 4, the cross beam 4 has an inner side surface close to the support platform 3 and an outer side surface opposite to the inner side surface, and the cross-sectional area of ​​the inner side surface gradually decreases to the cross-sectional area of ​​the outer side surface.

[0049] In this embodiment, the transition piece can be specifically a cross beam 4 with a trapezoidal cross section, the cross section area of ​​the inner side of the cross beam 4 close to the pedestal 3 is the largest, and the cross section area of ​​the outer side away from the pedestal 3 is the smallest. The inner side with the largest cross section area is used to contact the pedestal 3, so as to reduce the local force on the pedestal 3, and the outer side with a smaller cross section area is used to cooperate with the anchor 2.

[0050] In one embodiment, the anti-thrust structure of the arch bridge may further include a protective tube, which is sleeved on the outside of the prestressed anchor cable 1, and the two ends of the protective tube are respectively flush with the outer side of the pedestal 3, and the end of the prestressed anchor cable 1 extends to the outside of the protective tube.

[0051] The protective tube may include: a hollow corrugated tube 5. The corrugated tube 5 is a tube body with a relatively stable structure and strong versatility. Of course, the specific configuration of the protective tube may also be in other forms, and is not limited to the above description. The technicians in the relevant field may make other changes under the inspiration of the technical essence of this application, but as long as the functions and effects achieved are the same or similar to those of this application, they should be covered within the protection scope of this application.

[0052] In this embodiment, the prestressed anchor cable 1, anchor 2, and corrugated pipe 5 need to be selected in a matching manner, and the prestress applied to the anchor cable needs to be determined by calculation according to the thrust generated by the arch bridge structure. The cross-sectional size of the cross beam 4 is determined by calculation according to the prestress applied by the anchor cable.

[0053] In one embodiment, a middle concrete encapsulation structure 6 is provided on the outer circumference of the protection tube, wherein the pedestal 3, beam 4 and middle concrete encapsulation structure 6 should be provided with steel bars, and the diameter and number of steel bars and the concrete strength should be determined by calculation.

[0054] The cross section of the middle concrete encapsulation structure 6 is any one of the following: circular or rectangular.

[0055] like Figure 3 As shown, for example, the middle concrete encapsulation structure 6 can adopt a rectangular cross section, specifically a square cross section. When a rectangular cross section is adopted, it is more convenient to install the template and pour concrete, and the construction is convenient. Among them, the cross-sectional size of the middle concrete encapsulation structure 6 is larger than the cross-sectional size of the corrugated pipe 5, so as to prevent the corrugated pipe 5 and the anchor cable from being disturbed.

[0056] In one embodiment, an end concrete encapsulation structure is disposed on the outer side of the anchor 2, and the end concrete encapsulation structure can be used to protect the anchor 2 from being corroded during use. The grade of the end concrete encapsulation structure is consistent with that of the crossbeam 4.

[0057] In addition, the pedestal 3, the cross beam 4, and the middle concrete encapsulation structure 6 should be provided with steel bars, and the diameter and number of the steel bars and the concrete strength are determined according to calculations.

[0058] In a specific implementation, the pedestal 3 has a longitudinal width of 5.2m, a transverse width of 10m, and a thickness of 1.8m. The crossbeam 4 has a long side of 0.8m, a short side of 0.45m, a thickness of 0.4m, and a width in the transverse direction of the bridge that is the same as that of the pedestal 3. The length of the prestressed anchor cable 1 is 26.5m, the specification is 5Φs15.2, the transverse arrangement spacing is 3.5m, and 3 are arranged in the center. The anchor 2 is YM15-5, the corrugated pipe 5 has a size of Φinside = 55mm, and the cross-sectional size of the middle concrete encapsulation structure 6 is 0.5m×0.5m. The pedestal 3 is provided with HRB400 grade 25mm diameter steel bars, and the crossbeam 4 and the middle concrete encapsulation structure 6 are provided with HRB400 grade 12mm diameter steel bars. The prestressed anchor cables 1 are symmetrically tensioned at both ends, and the prestressing value is applied in stages according to the size of the horizontal thrust generated by the construction progress of the upper part of the arch bridge. The entire anti-thrust structure system works together to achieve the purpose of resisting the horizontal thrust of the arch bridge.

[0059] In the embodiment of the present application, an arch bridge is further provided, and the arch bridge includes a first side and a second side opposite to each other along the span direction, and the first side and the second side are respectively provided with a cap 3. The arch bridge includes the anti-thrust structure of the arch bridge described in the above embodiment, and the anti-thrust structure is connected between the caps 3. The arch bridge can achieve the technical effect achieved by the anti-thrust structure embodiment by providing the anti-thrust structure. For details, please refer to the specific description of the above embodiment, and the present application will not repeat them here.

[0060] It should be noted that, in the description of this application, the terms "first", "second", etc. are only used for descriptive purposes and to distinguish similar objects. There is no order of precedence between the two, and they cannot be understood as indicating or implying relative importance. In addition, in the description of this application, unless otherwise specified, the meaning of "plurality" is two or more.

[0061] The above-mentioned various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other. Each embodiment focuses on the differences from other embodiments.

[0062] The above are only a few embodiments of the present invention. Although the embodiments disclosed by the present invention are as above, the contents are only embodiments adopted for facilitating the understanding of the present invention and are not used to limit the present invention. Any technician in the technical field to which the present invention belongs can make any modification and change in the form and details of the implementation without departing from the spirit and scope disclosed by the present invention, but the scope of patent protection of the present invention shall still be subject to the scope defined by the attached claims.

Claims

1. An anti-thrust structure of an arch bridge, the anti-thrust structure is used to be installed on the arch bridge, the arch bridge includes a first side and a second side opposite to each other along its span direction, the first side and the second side are respectively provided with a cap, characterized in that: The pedestals on the first side and the second side are respectively provided with through holes extending along the span direction; The anti-thrust structure of the arch bridge includes: A prestressed anchor cable, wherein the prestressed anchor cable extends longitudinally along the span direction; A transition piece, the transition piece is located between the end of the prestressed anchor cable and the cap, the cross-sectional dimension of the transition piece in a direction perpendicular to the span is larger than the cross-sectional dimension of the prestressed anchor cable, the transition piece is provided with a mounting hole for passing the prestressed anchor cable, the end of the prestressed anchor cable passes through the through holes of the caps on the first side and the second side along the span direction and passes through the mounting hole of the transition piece at the same time; Anchorage, wherein the anchorage is used to anchor the end of the prestressed anchor cable outside the transition piece.

2. The anti-thrust structure of an arch bridge according to claim 1, characterized in that: The transition piece includes any one of the following: a crossbeam, a steel plate.

3. The anti-thrust structure of an arch bridge according to claim 2, characterized in that: The transition piece is a cross beam, and the cross beam has an inner side surface close to the support platform and an outer side surface opposite to the inner side surface, and the cross-sectional area of ​​the inner side surface gradually decreases to the cross-sectional area of ​​the outer side surface.

4. The anti-thrust structure of an arch bridge according to claim 1, characterized in that: An end concrete encapsulation structure is arranged on the outer side of the anchor.

5. The anti-thrust structure of an arch bridge according to claim 1, characterized in that: The anti-thrust structure of the arch bridge also includes a protection tube, which is sleeved on the outside of the prestressed anchor cable. The two ends of the protection tube are respectively flush with the outside of the pedestal, and the end of the prestressed anchor cable extends to the outside of the protection tube.

6. The anti-thrust structure of an arch bridge according to claim 5, characterized in that: The protection tube comprises: a hollow corrugated tube.

7. The anti-thrust structure of an arch bridge according to claim 5, characterized in that: A central concrete encapsulation structure is arranged on the outer circumference of the protection tube, and the cross section of the central concrete encapsulation structure is any one of the following: circular or rectangular.

8. The anti-thrust structure of an arch bridge according to claim 1, characterized in that: The line shape of the prestressed anchor cable is a straight line, and the length of the prestressed anchor cable is within 50 meters.

9. The anti-thrust structure of an arch bridge according to claim 1, characterized in that: The prestressed anchor cables include multiple groups, and the multiple groups of prestressed anchor cables are arranged at equal intervals in the transverse direction of the bridge.

10. The anti-thrust structure of an arch bridge according to claim 9, characterized in that: The spacing between two adjacent groups of prestressed anchor cables in the transverse direction of the bridge is more than 3 meters.

11. An arch bridge, characterized in that: The arch bridge includes a first side and a second side opposite to each other along its span direction, and the first side and the second side are respectively provided with abutments. The arch bridge includes the anti-thrust structure of the arch bridge according to any one of claims 1 to 10, and the anti-thrust structure is connected between the abutments.

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