Composite arched girder structure

Abstract

The utility model relates to the field of bridge design, and discloses a composite arched girder structure which comprises a girder body, a pier platform, a main arch ring, a secondary arch ring and a suspender. The beam body comprises a main beam section and a straining beam section which are arranged in the length direction of the bridge, one end of the straining beam section is erected on a pier platform support, and the other end of the straining beam section is fixedly connected with the main beam section into a whole; an arch foot of the main arch ring is fixedly connected with the end part, far away from the main beam section, of the straining beam section; an arch foot of the secondary arch ring is fixedly connected with the end part of the main beam section; one end of the suspender is fixedly connected with the main arch ring, and the other end is fixedly connected with the straining beam section or the secondary arch ring; a bridge deck system is arranged between the beam bodies symmetrically arranged in the width direction of the bridge body. In the utility model, the straining beam section and the main beam section are arranged, the secondary arch ring is arranged on the main beam section, and the suspender in the middle is connected with the secondary arch ring, so that the rigidity of the whole structure is increased, and the height of the main arch ring is effectively reduced; the length of the midspan suspender is shortened, and the stability of the midspan suspender is improved.

Description

Technical Field

[0001] The utility model relates to the field of bridge design, in particular to a composite arch beam structure. Background Art

[0002] The arch bridge is an ancient type of bridge and is also a type of bridge frequently used in modern bridge construction. In addition to the vertical reaction force at the supports at both ends of the arch bridge under the action of vertical load, it also produces horizontal thrust. It is this horizontal thrust that creates axial pressure in the arch and greatly reduces the mid-span bending moment, allowing the strength of the main arch section material to be fully utilized and the spanning capacity to be increased. Therefore, arch bridges are widely used in bridge engineering construction, especially landscape bridges.

[0003] As a member of the arch bridge family, the tied arch bridge has the general characteristics of the arch bridge and its own unique characteristics. It is a type of bridge that combines the advantages of the arch and the beam. It combines the two basic structural forms of arch and beam to bear the load together, giving full play to the structural performance and combined effect of the beam being bent and the arch being compressed. The horizontal thrust at both ends of the arch foot is borne by the tie rod, so that the supports at both ends of the arch foot do not generate horizontal thrust. The arch and the beam are connected by vertical rods hinged at both ends. This type of arch bridge is an over-static system inside and statically determinate outside, so it has no effect on the uneven settlement of the piers.

[0004] In the existing technology, the traditional tied arch bridge is usually composed of the main arch ring, hangers and bridge deck tie rods, among which the main arch ring bears the main lateral load, while the bridge deck tie rods are used to transfer the longitudinal load. However, the existing tied arch bridge structure still has certain limitations in the design and construction process, such as uneven force on the main arch ring, complex connection between the hangers and the bridge deck tie rods, and high construction difficulty. In particular, since the tied arch bridge must be equipped with hangers at certain intervals, and the hangers have a certain degree of visual obstruction, and the conventional tied arch bridge often has a higher arch ring, the installation process of the hangers of the tied arch bridge is relatively complicated. Utility Model Content

[0005] The technical problem to be solved by the utility model is: how to improve the structural stability and reduce the adverse effects of the hanger. In order to solve the above technical problems, the utility model provides a composite arch beam structure, including a beam body, a bridge pier, and a main arch ring, a secondary arch ring and a hanger arranged above the beam body;

[0006] The beam body comprises a main beam section and two tie beam sections arranged along the length direction of the bridge, one end of the tie beam section is erected on the pier support, and the other end is fixedly connected to the main beam section to form a whole;

[0007] The arch feet at both ends of the main arch ring are fixedly connected to the end of the tie beam section away from the main beam section; the arch feet at both ends of the secondary arch ring are fixedly connected to the end of the main beam section; one end of the hanger is fixedly connected to the arch body of the main arch ring, and the other end is fixedly connected to the arch body of the tie beam section or the secondary arch ring; a bridge deck system for passage is provided between the beams symmetrically arranged along the width direction of the bridge body.

[0008] Preferably, at least two of the beam bodies, primary arch rings and secondary arch rings are arranged along the width direction of the bridge body.

[0009] Preferably, the ratio of the secondary arch ring height to the main beam section length is greater than 1 / 5, and the main beam section adopts equal-height beams.

[0010] Preferably, the ratio of the secondary arch ring height to the main beam section length is not greater than 1 / 5, and the main beam section adopts a variable height beam.

[0011] Preferably, the top surface of the main beam section is flush with the top surface of the tie beam section, and the height of the main beam section is greater than the height of the tie beam section.

[0012] Preferably, the main arch ring adopts a steel-concrete composite structure; the secondary arch ring adopts a steel structure, a steel-concrete composite structure or a concrete structure; the tie beam section and the main beam section adopt a steel structure or a concrete structure.

[0013] Preferably, when the tie beam section and the main beam section adopt concrete structure, the tie beam section and the main beam section both include prestressed steel strands arranged inside the beam along the length of the bridge.

[0014] Preferably, the hanger is arranged at an angle; the bottom end of the hanger is fixedly connected to a fixing anchor provided on the tie beam section or the secondary arch ring; the upper end of the hanger is fixedly connected to the main arch ring through a tensioning anchor and bolts.

[0015] Preferably, the main beam section is provided with an observation deck below the secondary arch ring, the observation deck protrudes from the side of the main beam section and is higher than the bridge deck system; a pedestrian guardrail is provided on the side of the observation deck away from the bridge deck system.

[0016] Preferably, a pedestrian staircase is provided on the top of the secondary arch.

[0017] Compared with the prior art, the composite arch beam structure provided in the embodiment of the utility model has the following beneficial effects:

[0018] In the present invention, by dividing the beam body of the bridge into a tie beam section and a main beam section, and then arranging a secondary arch ring on the main beam section, and connecting the hangers in the middle of the main arch ring to the secondary arch ring instead of directly connecting to the main beam section, the overall structural stiffness can be increased, the stability of the structure is guaranteed, and the height of the main arch ring is effectively reduced; in addition, the provision of the secondary arch ring also greatly shortens the length of the mid-span hanger, which not only improves the stability of the mid-span hanger, but also makes the lengths of the hangers in the bridge tend to be consistent, which is conducive to adjusting the stress conditions of each hanger, thereby improving the stability of the overall structure of the bridge. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a side view of the utility model;

[0020] Figure 2 This utility model Figure 1 Cross-sectional view at AA in the middle.

[0021] In the figure: 1, beam body; 11, main beam section; 12, tie beam section; 13, prestressed steel strands; 14, viewing platform; 15, pedestrian guardrail;

[0022] 2. Main arch;

[0023] 3. Secondary arch;

[0024] 4. Suspension rod;

[0025] 5. Bridge piers;

[0026] 6. Bridge deck system. DETAILED DESCRIPTION

[0027] The following is a further detailed description of the specific implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0028] like Figure 1 As shown, the preferred embodiment of the utility model provides a composite arch beam structure, which includes a beam body 1, a bridge pier 5, and a main arch ring 2, a secondary arch ring 3 and a hanger 4 arranged above the beam body 1;

[0029] The beam body 1 includes a main beam section 11 and two tie beam sections 12 arranged along the length direction of the bridge. One end of the tie beam section 12 is mounted on the support of the pier 5, and the other end is fixedly connected to the main beam section 11 to form a whole.

[0030] The arch feet at both ends of the main arch ring 2 are fixedly connected to the end of the tie beam section 12 away from the main beam section 11; the arch feet at both ends of the secondary arch ring 3 are fixedly connected to the end of the main beam section 11; one end of the hanger 4 is fixedly connected to the arch body of the main arch ring 2, and the other end is fixedly connected to the arch body of the tie beam section 12 or the secondary arch ring 3; a bridge deck system 6 for passing is provided between the beams 1 symmetrically arranged along the width direction of the bridge body.

[0031] Specifically, under this type of bridge structure, the tie beam sections 12 at both ends are subjected to downward pressure exerted by vehicles and the deadweight of the bridge, while the main arch ring 2 applies tension to the tie beam sections 12. The main arch ring 2 is relatively subjected to downward tension, and the end of the main arch ring 2 tends to move downward and outward. The pier 5 applies an upward supporting force to the main arch ring 2, and the internal force of the tie beam sections 12 and the main beam sections 11 along the length direction of the bridge provides an inward force for the main arch ring 2. Furthermore, in the main beam section 11 part, the main beam section 11 and the secondary arch ring 3 are a whole. The main beam section 11 is subjected to downward pressure exerted by vehicles and its own weight, while the main arch ring 2 provides an upward tension to the main beam section 11 through the hanger 4 and the secondary arch ring 3. The middle of the main arch ring 2 Correspondingly, the main arch ring 2 is subjected to downward tension, and the main arch ring 2 disperses this part of the tension to its end. Due to the upward tension, the end of the secondary arch ring 3 tends to move inward, and this tendency is applied to the end of the main beam section 11, and the end of the main beam section 11 is fixedly connected to the tie beam section 12. That is to say, in this part of the beam body 1, the ends on both sides are subjected to outward tension, and the middle part is subjected to inward tension. These two parts of force are in opposite directions, thereby reducing the total external force on the beam body 1, making full use of the internal force of the beam body 1, enhancing the overall structural stiffness and stability of the bridge, and then effectively reducing the height of the main arch ring 2, so that the bridge can be suitable for projects with limited height. In addition, in a conventional tied arch bridge, the length of the mid-span hanger 4 located in the middle is undoubtedly much longer than the hangers 4 near the two ends of the arch. In the present invention, the length of the mid-span hanger 4 is greatly shortened, and is almost the same as the length of the hangers 4 near the two ends of the arch. On the one hand, this structure improves the stability of the hanger 4 because the length of the mid-span hanger 4 is shortened, and since the lengths of the hangers 4 are similar, it is beneficial to the production and manufacturing of the hangers 4 and the adjustment of the stress state during installation, further improving the stability of the overall structure. On the other hand, since no hanger 4 is arranged between the main beam section 11 and the secondary arch ring 3, the hanger 4 will no longer affect the field of view of the middle part of the bridge, making the field of view of the middle part of the bridge wider.

[0032] In some embodiments, at least two beam bodies 1, primary arch rings 2 and secondary arch rings 3 are evenly arranged along the width direction of the bridge body. Specifically, two secondary arch rings 3 and two primary arch rings 2 are arranged to improve the rigidity and stability of the overall structure, and in some wide multi-lane bridge projects, three or more beam bodies 1, primary arch rings 2 and secondary arch rings 3 may be arranged to improve the rigidity and stability of the overall bridge structure.

[0033] In some embodiments, when the ratio of the height of the secondary arch ring 3 to the length of the main beam section 11 is greater than 1 / 5, the main beam section 11 adopts a beam of equal height.

[0034] When the ratio of the height of the secondary arch ring 3 to the length of the main beam section 11 is not greater than 1 / 5, the main beam section 11 adopts a variable height beam.

[0035] Specifically, when the span of the bridge is too large, the length of the main beam section 11 will be longer, and the bending moment in the middle will be greater, which will make it more likely to have problems due to insufficient strength. When the ratio of the height of the secondary arch ring 3 to the length of the main beam section 11 is greater than 1 / 5, it indicates that the span of the bridge is within a controllable range and equal-height beams can be used for production and construction. When the ratio of the height of the secondary arch ring 3 to the length of the main beam section 11 is greater than 1 / 5, it indicates that the involved span is large and the bending moment in the main beam section 11 is also large. It is necessary to increase the thickness or height of the middle part of the main beam section 11 to improve the strength of the main beam section 11 so that the main beam section 11 can withstand a larger bending moment.

[0036] In some embodiments, the top surface of the main beam section 11 is flush with the top surface of the tie beam section 12, and the height of the main beam section 11 is greater than the height of the tie beam section 12. Specifically, the main beam section 11 is greater in height than the tie beam section 12 because it requires higher strength to withstand greater bending moments, and the flush top surface can ensure the smooth paving process of the bridge deck system 6 and ensure the flatness of the bridge deck.

[0037] In some embodiments, the main arch ring 2 adopts a steel-concrete composite structure; the secondary arch ring 3 adopts a steel structure, a steel-concrete composite structure or a concrete structure; the tie beam section 12 and the main beam section 11 adopt a steel structure or a concrete structure.

[0038] Furthermore, when the tie beam section 12 and the main beam section 11 are made of concrete structure, both the tie beam section 12 and the main beam section 11 include prestressed steel strands 13 arranged inside the beam along the length of the bridge.

[0039] Specifically, the main arch ring 2 is constructed by combining steel structure with concrete. On the one hand, its manufacturing cost is lower, and on the other hand, its structural strength is better, which can better utilize the internal stress of concrete, making the overall structure of the bridge more stable; the secondary arch ring 3 is smaller in size, so a pure steel structure can be used, and the cost will not be too high. The tensile strength of the steel structure is also better, and it can better withstand the tension applied by the hanger 4. A combination of steel and concrete structures can be used, or a pure concrete structure can be used to further reduce costs and utilize the internal stress of concrete; the tie beam section 12 and the main beam section 11 use steel structures for better strength, but the cost may be too high, while the use of concrete structures can provide better tensile strength, which can better offset the outward tension applied by the main arch ring 2, making the overall structure of the bridge more stable and reliable. In addition, when the beam body 1 adopts a concrete structure, a prestressed steel bundle 13 needs to be arranged in the beam body 1. The prestressed steel bundle 13 bends and changes in the main beam section 11 as the height of the main beam section 11 changes. The prestressed steel bundle 13 is used to meet the bending requirements of the main beam section 11 and increase the bending strength of the main beam section 11.

[0040] In some embodiments, the suspension rod 4 is tilted; the bottom end of the suspension rod 4 is fixedly connected to the fixing anchor provided on the tie beam section 12 or the secondary arch ring 3; the upper end of the suspension rod 4 is fixedly connected to the primary arch ring 2 through a tensioning anchor and a bolt. Specifically, the bottom end of the suspension rod 4 is fixedly connected to the tie beam section 12 and the secondary arch ring 3 through a fixing anchor fixed in the tie beam section 12 or the secondary arch ring 3, and its connection structure is more stable and reliable, and is not prone to problems such as loosening; and the upper end of the suspension rod 4 is connected to the primary arch ring 2 by a tensioning anchor, which is convenient for tensioning the suspension rod 4, adjusting the stress state of the suspension rod 4, and facilitating subsequent maintenance and replacement.

[0041] In some embodiments, the main beam section 11 is provided with a viewing platform 14 below the secondary arch ring 3, the viewing platform 14 protrudes from the side of the main beam section 11 and is higher than the bridge deck system 6; a pedestrian guardrail 15 is provided on the side of the viewing platform 14 away from the bridge deck system 6. Specifically, since there is no suspension rod 4 between the main beam section 11 and the secondary arch ring 3, there is no suspension rod 4 to block the line of sight in this space, the field of vision is more open, and the viewing effect is naturally better. Therefore, the viewing platform 14 protruding from the main part of the bridge is provided at the main beam section 11 to fully utilize the good visual environment there.

[0042] Furthermore, a pedestrian staircase is provided on the top of the secondary arch ring 3. When the secondary arch ring 3 is a steel structure or a combination of a steel structure and a concrete structure, the width of the secondary arch ring 3 can be widened, and a pedestrian staircase is formed above it for pedestrians to climb up and look far away. At this time, the suspension rod is connected to the side of the secondary arch ring close to the main arch ring, and the view of the secondary arch ring facing the water surface is better, which can further improve the scenery viewing effect of the middle part of the bridge.

[0043] In summary, the embodiment of the utility model provides a composite arch-beam structure, which divides the beam body 1 of the bridge into a tie beam section 12 and a main beam section 11, arranges a secondary arch ring 3 on the main beam section 11, and connects the hanger 4 in the middle of the main arch ring 2 to the secondary arch ring 3 instead of directly connecting to the main beam section 11, thereby making full use of the internal stress of the bridge to offset the external force exerted on the entire bridge, improving the stiffness and stability of the overall structure of the bridge, and effectively reducing the height of the main arch ring 2.

[0044] In addition, the provision of the secondary arch ring 3 also greatly shortens the length of the mid-span hanger 4, improves the structural stability of the mid-span hanger 4, and makes the lengths of the hangers 4 in the bridge tend to be consistent, which is beneficial to adjust the stress conditions of each hanger 4 during the construction process, and further improves the stability of the overall structure of the bridge; and there is no hanger 4 above the main beam section 11, so the field of view is wider and it is more convenient to view the scenery.

[0045] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principle of the present invention. These improvements and substitutions should also be regarded as the protection scope of the present invention.

Claims

1. A composite arch beam structure, characterized in that: It includes a beam body, a pier, and a main arch ring, a secondary arch ring and a hanger rod arranged above the beam body; The beam body comprises a main beam section and two tie beam sections arranged along the length direction of the bridge, one end of the tie beam section is erected on the pier support, and the other end is fixedly connected to the main beam section to form a whole; The arch feet at both ends of the main arch ring are fixedly connected to the end of the tie beam section away from the main beam section; the arch feet at both ends of the secondary arch ring are fixedly connected to the end of the main beam section; one end of the hanger is fixedly connected to the arch body of the main arch ring, and the other end is fixedly connected to the arch body of the tie beam section or the secondary arch ring; a bridge deck system for passage is provided between the beams symmetrically arranged along the width direction of the bridge body.

2. The composite arch beam structure according to claim 1, characterized in that: At least two of the beam body, the main arch ring and the secondary arch ring are arranged along the width direction of the bridge body.

3. The composite arch beam structure according to claim 1, characterized in that: The ratio of the secondary arch ring height to the main beam section length is greater than 1 / 5, and the main beam section adopts equal-height beams.

4. The composite arch beam structure according to claim 1, characterized in that: The ratio of the secondary arch ring height to the main beam section length is not greater than 1 / 5, and the main beam section adopts a variable height beam.

5. The composite arch beam structure according to claim 1, characterized in that: The top surface of the main beam section is flush with the top surface of the tie beam section, and the height of the main beam section is greater than the height of the tie beam section.

6. The composite arch beam structure according to claim 1, characterized in that: The main arch ring adopts a steel-concrete composite structure; the secondary arch ring adopts a steel structure, a steel-concrete composite structure or a concrete structure; the tie beam section and the main beam section adopt a steel structure or a concrete structure.

7. The composite arch beam structure according to claim 6, characterized in that: When the tie beam section and the main beam section adopt concrete structure, the tie beam section and the main beam section both include prestressed steel strands arranged inside the beam along the length of the bridge.

8. The composite arch beam structure according to claim 1, characterized in that: The hanger is arranged at an angle; the bottom end of the hanger is fixedly connected to a fixing anchor arranged on the tie beam section or the secondary arch ring; the upper end of the hanger is fixedly connected to the main arch ring through a tensioning anchor and bolts.

9. The composite arch beam structure according to claim 1, characterized in that: The main beam section is provided with an observation deck below the secondary arch ring, the observation deck protrudes from the side of the main beam section and is higher than the bridge deck system; a pedestrian guardrail is provided on the side of the observation deck away from the bridge deck system.

10. The composite arch beam structure according to claim 1, characterized in that: A pedestrian staircase is provided on the top of the secondary arch.

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