Combined bridge

Abstract

The utility model discloses a combined bridge and relates to the technical field of bridge engineering. The combined bridge comprises a sling bridge body and an arch bridge body, the sling bridge body comprises a sling, a first bridge abutment and a first bridge deck system, the two ends of the sling are connected with the first bridge abutment, the sling is provided with a supporting piece for supporting the first bridge deck system, and the arch bridge body comprises a main arch, a second bridge abutment and a second bridge deck system. The two ends of the second bridge deck system are connected with the second bridge abutment, the main arch is provided with stand columns for supporting the second bridge deck system, and arch feet of the main arch are connected with the first bridge abutment. The combined bridge has the advantages of being high in bearing capacity and traffic capacity.

Description

Technical Field

[0001] The utility model relates to the technical field of bridge engineering, in particular to a combined bridge. Background Art

[0002] The concrete self-anchored suspension bridge is a common large-span bridge structure with excellent seismic performance, high clearance, restricted space for high-passing vehicles, and good feasibility in working conditions. It has broad application prospects in various geological environments.

[0003] For concrete self-anchored suspension bridges, since the bridge deck is subjected to a large longitudinal pressure, the bridge deck needs to be designed to be thicker, which greatly increases the dead load. If the bridge deck is designed to be horizontal, the bridge deck will bend downward under the combined effect of the longitudinal pressure and live load, resulting in an increase in the additional bending moment of the bridge deck, which will weaken the compressive strength of the bridge deck structure. Once the bridge deck is crushed and unstable, the bridge will fail and collapse. In addition, the traffic capacity of a self-anchored suspension bridge is limited, and it is not suitable for areas with large traffic volume.

[0004] Therefore, the prior art needs to be improved. Utility Model Content

[0005] The technical problem to be solved by the utility model is that the existing self-anchored suspension bridge has limited traffic capacity and bearing capacity, and the purpose is to provide a combined bridge that adopts corresponding technical means and has the beneficial effects of strong bearing capacity and strong traffic capacity.

[0006] The utility model is realized by the following technical solutions:

[0007] A combined bridge comprises a suspension bridge body and an arch bridge body.

[0008] The suspension bridge body includes a suspension, a first abutment and a first bridge deck system. Both ends of the suspension are connected to the first abutment. The suspension is provided with a support member for supporting the first bridge deck system.

[0009] The arch bridge body includes a main arch, a second abutment, and a second bridge deck system. Both ends of the second bridge deck system are connected to the second abutments. The main arch is provided with columns supporting the second bridge deck system. The arch foot of the main arch is connected to the first abutment.

[0010] In the above technical solution, the combined bridge includes a suspension bridge body and an arch bridge body, and the arch bridge body is located on the top of the suspension bridge body. The two ends of the second bridge deck system are fixed by the second abutment, the bottom of the second bridge deck system is fixedly supported by the main arch, and the arch foot of the main arch is fixed on the first abutment. Both ends of the first bridge deck system and the suspension are fixed to the first abutment, and the bottom of the first bridge deck system is fixedly supported by the support on the suspension. Two bridges are erected on the vertical plane of the same span to improve the traffic capacity of vehicles, which is suitable for areas with large traffic volume. The suspension and the arch foot are fixed at the same place to reduce the horizontal force on the arch foot. The upper-supported arch bridge body generates horizontal thrust at the arch foot, and the suspension generates horizontal tension at the arch foot. The directions of the two groups of forces are opposite and can be completely or partially offset, so the bearing capacity is stronger, or the same bearing capacity can be designed with a suspension bridge body with a larger span.

[0011] Furthermore, in the utility model, the above-mentioned support member includes a bent frame connected to the suspension belt, a cap beam is arranged on the top of the bent frame, and the cap beam is connected to the first bridge deck system.

[0012] Furthermore, in the utility model, a bottom beam is provided at the bottom of the first bridge deck system, and a support for supporting the bottom beam is provided at the top of the cap beam.

[0013] Furthermore, in the present invention, a tie beam is provided in the middle of the above-mentioned bent frame.

[0014] Furthermore, in the present invention, the arch feet are configured as herringbone arch feet, and the first bridge deck is located between the herringbone arch feet.

[0015] Furthermore, in the utility model, a secondary arch is provided at the bottom of the second bridge deck system, and the top of the column is connected to the secondary arch.

[0016] Furthermore, in the present invention, the above-mentioned column is arranged between the two auxiliary arches.

[0017] Furthermore, in the present invention, the suspension belt is configured as prestressed reinforced concrete, and prestressed steel strands are arranged inside the prestressed reinforced concrete.

[0018] Furthermore, in the utility model, temporary anchor holes and permanent anchor holes are provided in the prestressed reinforced concrete.

[0019] Furthermore, in the present invention, guardrails are provided on both sides of the first bridge deck system and the second bridge deck system.

[0020] Compared with the prior art, the utility model has the following advantages and beneficial effects:

[0021] 1. Strong bearing capacity: The arch foot of the main arch is fixed on the first abutment, and the first bridge deck system and both ends of the suspension are fixed to the first abutment. The suspension and the arch foot are fixed at the same place to reduce the horizontal force on the arch foot. The upper arch bridge body generates horizontal thrust at the arch foot, and the suspension generates horizontal tension at the arch foot. The two groups of forces are in opposite directions and can be completely or partially offset, so the bearing capacity is stronger, or the same bearing capacity can be designed with a suspension bridge body with a larger span.

[0022] 2. Strong traffic capacity: The combined bridge consists of a suspension bridge body and an arch bridge body, and the arch bridge body is located on the top of the suspension bridge body. Two bridges are erected on the vertical plane of the same span to improve the traffic capacity of vehicles, which is suitable for areas with large traffic volume. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings described herein are used to provide a further understanding of the embodiments of the present utility model, constitute a part of this application, and do not constitute a limitation of the embodiments of the present utility model. In the drawings:

[0024] Figure 1 It is a structural schematic diagram of a combined bridge of the utility model;

[0025] Figure 2 It is a structural schematic diagram of the herringbone arch foot of the utility model;

[0026] Figure 3 It is a cross-sectional schematic diagram of the suspension belt of the utility model.

[0027] Markings and corresponding parts names in the attached drawings: 1-suspension bridge body, 101-suspension, 102-first abutment, 103-first bridge deck system, 104-bottom beam, 2-arch bridge body, 201-main arch, 2011-arch foot, 202-second abutment, 203-second bridge deck system, 204-secondary arch, 3-support, 301-frame, 302-cap beam, 303-tie beam, 304-support, 4-column. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solutions and advantages of the utility model more clearly understood, the utility model is further described in detail below in conjunction with embodiments and drawings. The schematic implementation manner of the utility model and its description are only used to explain the utility model and are not intended to limit the utility model.

[0029] The following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0031] In the description of the embodiments of the present utility model, it should be noted that if the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, or is the orientation or position relationship in which the utility model product is usually placed when used. It is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model.

[0032] In addition, the terms "horizontal" and "vertical" do not mean that the components must be absolutely horizontal or vertical, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", which does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0033] In the description of the embodiments of the present invention, "multiple" means at least 2.

[0034] In the description of the embodiments of the present utility model, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0035] Example

[0036] This embodiment provides a combined bridge, such as Figure 1-Figure 3 As shown, the specific structure is as follows.

[0037] Combination Figure 1 As shown, the composite bridge of this embodiment includes two parts, a suspension bridge body 1 and an arch bridge body 2, and the arch bridge body 2 is located at the top of the suspension bridge body 1. The suspension bridge body 1 includes three parts: a suspension 101, a first abutment 102 and a first bridge deck system 103, wherein the first abutment 102 of cast-in-place concrete of two brackets is fixed to the slopes on both sides, the two ends of the suspension 101 are fixedly connected to the first abutments 102 on both sides, and the first bridge deck system 103 is a road surface for cars and pedestrians to pass, and the two ends of the first bridge deck system 103 are also fixedly connected to the first abutments 102 on both sides.

[0038] In order to enhance the fixing effect, a plurality of vertical support members 3 are installed on the sling 101. Figure 1 As shown, the support member 3 includes three parts: a frame 301, a cap beam 302 and a tie beam 303. The bottom end of the frame 301 is fixedly connected to the suspension belt 101, the cap beam 302 is fixedly installed on the top of the frame 301, and the two frames 301 are connected by a tie beam 303 to enhance the stability of the structure.

[0039] Further, combined with Figure 1 As shown, a bottom beam 104 for enhancing structural strength is installed at the bottom of the first bridge deck system 103, and a support 304 is installed on the top of the cap beam 302, and the support 304 is connected to the bottom beam 104. The support member 3 supports the first bridge deck system 103, and the overall use effect is good.

[0040] It should be noted that the support 304 can adopt the high-bearing capacity shock-absorbing rubber plate support 304 in the prior art.

[0041] In some implementations of this embodiment, Figure 1 As shown, the arch bridge body 2 mainly includes three parts: the main arch 201, the second abutment 202, and the second bridge deck system 203. The second abutment 202 is also cast-in-place concrete with a bracket and is fixed to the slopes on both sides. The second bridge deck system 203 is used as a road surface for cars and pedestrians to pass. The two ends of the second bridge deck system 203 are fixedly connected to the two second abutments 202.

[0042] It should be noted that both the first abutment 102 and the second abutment 202 are gravity abutments. In some implementations of this embodiment, guardrails are provided on both sides of the first bridge deck system 103 and the second bridge deck system 203 to protect vehicles and pedestrians.

[0043] Combination Figure 1 and Figure 2 As shown, the main arch 201 is an arch made of a steel frame, and both ends of the main arch 201 are bifurcated herringbone arch feet 2011, the herringbone arch feet 2011 are fixedly connected to the first abutment 102, and the main arch 201 is erected above the first bridge deck system 103. The first bridge deck system 103 is located between the herringbone arch feet 2011, so that the herringbone arch feet 2011 do not affect the passage of vehicles or pedestrians.

[0044] Further, such as Figure 1 As shown, a secondary arch 204 is provided at the bottom of the first bridge deck system 103 , and a plurality of vertical columns 4 are installed on the main arch 201 . The top of the column 4 is fixedly connected to the secondary arch 204 , and the connection is located between the two secondary arches 204 .

[0045] In some implementations of this embodiment, the suspension belt 101 is made of prestressed reinforced concrete, and prestressed steel strands are arranged inside the prestressed reinforced concrete. Temporary anchor holes and permanent anchor holes are arranged inside the prestressed reinforced concrete, and the temporary anchor holes and permanent anchor holes are convenient for anchor cables to pass through. The anchor cable is made of steel strands, and the steel strands have a nominal diameter of 15.2 mm and a strength grade of 1860 Mpa. Figure 3 As shown, the suspension 101 has two rows of temporary anchor holes A and B, or permanent anchor holes, and the number of steel strands in each hole is between 20 and 30. There are 22 holes in total, and the anchor cables are divided into 14 holes for temporary anchor cables and 8 holes for permanent anchor cables. Since the horizontal forces generated by the suspension 101 and the main arch 201 can be offset after the bridge is formed, the axial force that the suspension 101 needs to provide is relatively small. During the construction process, because the construction load is large and numerous, more temporary anchor cables are required to provide force. After forming, the number of permanent anchor cable holes is less than that of temporary anchor cables, saving materials. The temporary anchor cable holes and permanent anchor cable holes are distributed as follows:

[0046] The first set of temporary anchor cables: A2 A10 B4 B8

[0047] The second set of temporary anchor cables: A5 A7 B3 B9

[0048] The third set of temporary anchor cables: A3 A6 A9 B1 B11

[0049] First anchoring: A2 A10 B4 B8

[0050] Second anchoring: A5 A7 B3 B9

[0051] The third anchoring: A3 A6 A9 B1 B11

[0052] Permanent anchor cable: A1 A4 A8 A11 B2 B5 B7 B10

[0053] The composite bridge of this embodiment adopts the following construction method:

[0054] S1. Construction of temporary anchorage and the first abutment 102.

[0055] S2. Construct the suspension 101 by casting it in situ through the bracket, or install the prefabricated suspension 101 by setting the suspension cable through temporary anchorage. Tension the first set of temporary anchor cables so that the suspension 101 can bear the force independently, and then remove the bracket. Tensioning can make the structure self-stabilizing and keep the horizontal force at the first abutment 102 balanced. Jacks are used for tensioning, and prestressing and elongation are double controlled. The deviation of elongation is not more than 5%. Tensioning needs to keep the left and right sides of the suspension bridge body 1 balanced, and the unbalanced channel is not more than 1 hole.

[0056] S3, construct the bent frame 301 on the suspension belt 101, set up the support frame 301 on the suspension belt 101, and tension the second set of temporary anchor cables. The second set of temporary anchor cables includes 4 holes: A5 A7 B3 B9.

[0057] S4, constructing the cap beam 302, the tie beam 303 and the first bridge deck system 103, and tensioning the third set of temporary anchor cables. The cap beam 302 and the tie beam 303 are constructed by setting up a support frame for cast-in-place, or installing prefabricated beams through beam erection equipment.

[0058] S5, constructing the main arch 201 of the arch bridge body 2 of the upper support type, by setting up a bracket on the first bridge deck system 103, and withdrawing the anchor for the first time.

[0059] S6, construct the secondary arch 204, column 4, second bridge deck system 203, and second abutment 202 by setting up brackets on the main arch 201. The second abutment 202 and the first secondary arch 204 close to the slope need to set up a section of brackets on the slope, and withdraw the anchor for the second time.

[0060] S7, tensioning the permanent anchor cable and withdrawing the anchor for the third time. The tensioning and withdrawing the anchor are performed alternately, and the horizontal forces of the main arch 201 and the suspension belt 101 on the first abutment 102 are always kept balanced.

[0061] S8. Prestressed hole grouting. Grout the permanent anchor hole and temporary anchor hole at a pressure of 0.6-0.8Mpa for 5 minutes. Use M50 cement slurry, add expansion agent to the slurry, and grout from bottom to top.

[0062] S9. Construct the post-cast strips of the first abutment 102 and the second abutment 202 using concrete with shrinkage compensation properties. The concrete grade is one grade higher than that of the first abutment 102 and the second abutment 202.

[0063] The working principle of the combined bridge of this embodiment is as follows:

[0064] The combined bridge includes a suspension bridge body 1 and an arch bridge body 2, wherein the arch bridge body 2 is located on the top of the suspension bridge body 1. Both ends of the second bridge deck system 203 are fixed by the second abutment 202, and the bottom of the second bridge deck system 203 is fixedly supported by the main arch 201, while the arch foot 2011 of the main arch 201 is fixed on the first abutment 102. Both ends of the first bridge deck system 103 and the suspension 101 are fixed to the first abutment 102, and the bottom of the first bridge deck system 103 is fixedly supported by the support member 3 on the suspension 101. Two bridges are erected on the vertical plane of the same span to improve the traffic capacity of vehicles, which is suitable for areas with large traffic volume. The suspension strap 101 and the arch foot 2011 are fixed at the same place to reduce the horizontal force on the arch foot 2011. The upper-supported arch bridge body 2 generates a horizontal thrust at the arch foot 2011, and the suspension strap 101 generates a horizontal tension at the arch foot 2011. The two groups of forces are in opposite directions and can be completely or partially offset, resulting in a stronger bearing capacity, or a suspension strap bridge body 1 with a larger span can be designed with the same bearing capacity.

[0065] In summary, the combined bridge of the utility model includes a suspension bridge body 1 and an arch bridge body 2. The suspension bridge body 1 includes a suspension 101, a first abutment 102 and a first bridge deck system 103. Both ends of the suspension 101 are connected to the first abutment 102. The suspension 101 is provided with a support member 3 supporting the first bridge deck system 103. The arch bridge body 2 includes a main arch 201, a second abutment 202 and a second bridge deck system 203. Both ends of the second bridge deck system 203 are connected to the second abutment 202. The main arch 201 is provided with a column 4 supporting the second bridge deck system 203. The arch foot 2011 of the main arch 201 is connected to the first abutment 102. The support member 3 includes a bent frame 301 connected to the suspension 101. A cap beam 302 is provided on the top of the bent frame 301. The cap beam 302 is connected to the first bridge deck system 103. A bottom beam 104 is provided at the bottom of the first bridge deck system 103, and a support 304 for supporting the bottom beam 104 is provided at the top of the cap beam 302. A tie beam 303 is provided in the middle of the bent frame 301. The arch foot 2011 is configured as a herringbone arch foot 2011, and the first bridge deck system 103 is located between the herringbone arch feet 2011. A secondary arch 204 is provided at the bottom of the second bridge deck system 203, and the top of the column 4 is connected to the secondary arch 204. The column 4 is arranged between the two secondary arches 204. The suspension belt 101 is configured as prestressed reinforced concrete, and prestressed steel strands are arranged inside the prestressed reinforced concrete. Temporary anchor holes and permanent anchor holes are arranged in the prestressed reinforced concrete. Guardrails are arranged on both sides of the first bridge deck system 103 and the second bridge deck system 203. Therefore, the combined bridge of the utility model has the beneficial effects of strong bearing capacity and strong traffic capacity.

[0066] The specific implementation methods described above further illustrate the purpose, technical solutions and beneficial effects of the utility model in detail. It should be understood that the above description is only the specific implementation method of the utility model and is not used to limit the protection scope of the utility model. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the utility model should be included in the protection scope of the utility model.

Claims

1. A composite bridge, characterized in that: It comprises a suspension bridge body (1) and an arch bridge body (2), The suspension bridge body (1) comprises a suspension (101), a first abutment (102) and a first bridge deck system (103), the two ends of the suspension (101) are connected to the first abutment (102), and the suspension (101) is provided with a support member (3) for supporting the first bridge deck system (103). The arch bridge body (2) comprises a main arch (201), a second abutment (202), and a second bridge deck system (203); both ends of the second bridge deck system (203) are connected to the second abutment (202); the main arch (201) is provided with a column (4) for supporting the second bridge deck system (203); and the arch foot (2011) of the main arch (201) is connected to the first abutment (102).

2. The composite bridge according to claim 1, characterized in that: The support member (3) comprises a bent frame (301) connected to the suspension belt (101), a cap beam (302) is arranged on the top of the bent frame (301), and the cap beam (302) is connected to the first bridge deck system (103).

3. The composite bridge according to claim 2, characterized in that: A bottom beam (104) is provided at the bottom of the first bridge deck system (103), and a support (304) for supporting the bottom beam (104) is provided at the top of the cap beam (302).

4. The composite bridge according to claim 2, characterized in that: A tie beam (303) is provided in the middle of the bent frame (301).

5. The composite bridge according to claim 1, characterized in that: The arch foot (2011) is configured as a herringbone arch foot (2011), and the first bridge deck system (103) is located between the herringbone arch feet (2011).

6. The composite bridge according to claim 1, characterized in that: A secondary arch (204) is provided at the bottom of the second bridge deck system (203), and the top of the column (4) is connected to the secondary arch (204).

7. The composite bridge according to claim 6, characterized in that: The column (4) is arranged between the two auxiliary arches (204).

8. The composite bridge according to any one of claims 1 to 7, characterized in that: The suspension belt (101) is configured as prestressed reinforced concrete, and a prestressed steel strand is arranged inside the prestressed reinforced concrete.

9. The composite bridge according to claim 8, characterized in that: Temporary anchor holes and permanent anchor holes are arranged in the prestressed reinforced concrete.

10. The composite bridge according to claim 1, characterized in that: Guardrails are provided on both sides of the first bridge deck system (103) and the second bridge deck system (203).

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