Arch bridge structure and construction method thereof

Abstract

The invention discloses an arch bridge structure and a construction method thereof, the arch bridge structure comprises two groups of arch ribs, each group of arch ribs comprises a main arch rib and side arch ribs on two sides of the main arch rib, the main arch ribs are fixedly connected with main piers on two sides, the side arch ribs are fixedly connected with the main piers and auxiliary pier cross beams, and the arch bridge structure further comprises a first cross beam located below a bridge floor and connected with the two main arch ribs; the two ends of the center hole longitudinal beam are supported on the first cross beams on the two sides respectively; the inner side end of the side hole longitudinal beam is fixedly connected with the first cross beam; the auxiliary hole longitudinal beam is fixedly connected with the outer side end of the side hole longitudinal beam, and a triangular rigid frame system is formed between the side hole longitudinal beam and the main arch rib and between the side hole longitudinal beam and the side arch rib, so that the earthquake force of each key control position of the arch bridge is reduced, and the arch bridge adapts to the geological conditions that the rigidity is weak and thrust cannot be provided.

Description

Technical Field

[0001] The invention relates to the field of bridge engineering, in particular to an arch bridge structure and a construction method thereof. Background Art

[0002] Arch bridges are a type of bridge widely used in highways or municipal projects in my country. Arch bridges often have the advantages of large spanning capacity, cost saving, and beautiful appearance, which can improve the landscape of a certain area. The structural design of arch bridges is subject to the following conditions: ① General geological conditions, weak rigidity, and inability to provide horizontal thrust; ② Hydrological requirements: water resistance ratio ≤ 5%; ③ High seismic fortification intensity (VIII and above), high peak acceleration of seismic motion (0.2g and above); ④ Limited building height (the height difference between the bridge deck and the riverbed or the ground is between 25m-40m); ⑤ Landscape requirements (no arch columns are set on the main arch ribs and side arch ribs). Therefore, the conventional arch bridge system does not meet the requirements.

[0003] Therefore, there is an urgent need for an improved arch bridge structure and its construction method that can better adapt to the above-mentioned geological conditions, hydrological requirements, seismic performance, building height and landscape requirements. Summary of the invention

[0004] The present invention aims to provide an arch bridge structure and a construction method thereof, which can solve the above-mentioned technical problems.

[0005] According to one aspect of the present invention, there is provided an arch bridge structure, comprising two groups of arch ribs, wherein each group of arch ribs comprises a main arch rib and side arch ribs on both sides thereof, the main arch ribs are fixedly connected to the main piers on both sides, and the side arch ribs are fixedly connected to the main piers and auxiliary pier cross beams, and further comprising: a first cross beam, located below the bridge deck, connecting the two main arch ribs; a center hole longitudinal beam, whose two ends are respectively supported on the first cross beam on both sides; a side hole longitudinal beam, whose inner end is fixedly connected to the first cross beam; and an auxiliary hole longitudinal beam, which is fixedly connected to the outer end of the side hole longitudinal beam.

[0006] Preferably, the side hole longitudinal beam adopts a segmented steel box beam, and the auxiliary hole longitudinal beam adopts a segmented prestressed concrete beam. The side hole longitudinal beam and the auxiliary hole longitudinal beam are fixedly connected via a steel-concrete joint section.

[0007] Preferably, a plurality of through-length tie rods are arranged inside the longitudinal beam, and both ends are respectively anchored to the auxiliary hole longitudinal beam.

[0008] Preferably, the prestressing force to be applied to each of the through-length tie rods is:

[0009] Among them, P is the prestressing force, H is the arch foot thrust of the main arch rib, q is the uniformly distributed load on the arch, L is the design length of the full-length tie rod, and h is the vertical distance between the arch crown and the arch foot of the main arch rib.

[0010] Preferably, the initial length of the through-length tie rod is: Among them, L s is the initial length, E s is the elastic modulus of the full-length tie rod, A s is the cross-sectional area of ​​the full-length tie rod.

[0011] Preferably, the central-hole longitudinal beam is supported on the first cross beam via a pot-type rubber movable support and a viscous damper, and an expansion joint is provided at the supporting position.

[0012] Preferably, it also includes a plurality of suspension rods vertically connecting the main arch rib and the central hole longitudinal beam, and the distance between two adjacent suspension rods is 9m.

[0013] Preferably, the main arch ribs include: main arch upper ribs, located above the design water level of the arch bridge, and using a steel structure box arch; main arch lower ribs, located below the design water level, and using a reinforced concrete box arch.

[0014] Preferably, the area enclosed by the side hole longitudinal beam, the main arch rib and the side arch rib does not include supporting columns.

[0015] According to another aspect of the present invention, a construction method of an arch bridge structure is provided, comprising: installing two groups of arch ribs, wherein each group of arch ribs comprises a main arch rib and side arch ribs on both sides thereof, the main arch ribs are fixedly connected to the main piers on both sides, and the side arch ribs are fixedly connected to the main piers and auxiliary pier cross beams; constructing a first cross beam below the bridge deck, fixedly connected between the two main arch ribs; constructing a center hole longitudinal beam along the longitudinal direction of the bridge, so that the two ends of the center hole longitudinal beam are respectively supported on the first cross beams on both sides; constructing a side hole longitudinal beam along the longitudinal direction of the bridge, the inner end of which is fixedly connected to the first cross beam; constructing an auxiliary hole longitudinal beam along the longitudinal direction of the bridge, fixedly connected to the outer end of the side hole longitudinal beam.

[0016] The invention discloses an arch bridge structure and a construction method thereof, comprising two groups of arch ribs, wherein each group of arch ribs comprises a main arch rib and side arch ribs on both sides thereof, the main arch ribs are fixedly connected to main piers on both sides, and the side arch ribs are fixedly connected to the main piers and auxiliary pier cross beams, and further comprising: a first cross beam, located below the bridge deck, connecting two main arch ribs; a middle hole longitudinal beam, the two ends of which are respectively supported on the first cross beam on both sides; a side hole longitudinal beam, the inner end of which is fixedly connected to the first cross beam; and an auxiliary hole longitudinal beam, which is fixedly connected to the outer end of the side hole longitudinal beam. By forming a triangular rigid frame system between the side hole longitudinal beam and the main arch ribs and the side arch ribs, the seismic force at each key control position of the arch bridge is reduced, and the geological conditions with weak rigidity and unable to provide thrust are adapted. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0018] Figure 1 Schematic diagram of an arch bridge structure according to an embodiment of the present invention. DETAILED DESCRIPTION

[0019] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0020] Reference will now be made in detail to various embodiments of the present invention, examples of which are shown in the accompanying drawings and described below. For ease of interpretation and precise definition in the appended claims, the terms "upper", "lower", "inner" and "outer" are used to describe features of the exemplary embodiments shown in the drawings with reference to their positions.

[0021] Figure 1 FIG. 4 shows a schematic diagram of an arch bridge structure according to an embodiment of the present invention. Figure 1 As shown, an embodiment of the present invention provides an arch bridge structure, comprising two groups of arch ribs, wherein each group of arch ribs comprises a main arch rib and side arch ribs on both sides thereof, the main arch ribs are fixedly connected to the main piers on both sides, the side arch ribs are fixedly connected to the main piers and auxiliary pier cross beams, and also includes: a first cross beam, located below the bridge deck, connecting the two main arch ribs; a middle hole longitudinal beam, whose two ends are respectively supported on the first cross beam on both sides; a side hole longitudinal beam, whose inner end is fixedly connected to the first cross beam; and an auxiliary hole longitudinal beam, which is fixedly connected to the outer end of the side hole longitudinal beam.

[0022] In the related art, the arch bridge structure system is generally combined according to the two categories of vehicle bearing and horizontal thrust. Since there are three types of each type (vehicle bearing is divided into upper, middle and lower bearing; horizontal thrust is divided into thrust, no thrust and partial thrust), there are a total of 9 possibilities. However, the combination of upper bearing and no thrust, upper bearing and partial thrust, middle bearing and no thrust, and lower bearing and thrust have not been seen or are rarely used. Therefore, there are only 5 common types, namely thrust upper bearing, thrust middle bearing, partial thrust middle bearing (flying bird), partial thrust lower bearing (lower bearing rigid frame tie arch) and no thrust lower bearing (arch beam combination).

[0023] However, there are restrictions on the structural design of arch bridges: ① general geological conditions, weak rigidity, and inability to provide horizontal thrust; ② hydrological requirements: water resistance ratio ≤5%; ③ high seismic fortification intensity (VIII and above), and high peak seismic acceleration (0.2g and above); ④ building height restrictions (the height difference between the bridge deck and the riverbed or the ground is between 25m-40m); ⑤ landscape requirements (no arch columns are set on the arch ribs of the main arch and the side arches). The above five types of arch bridge structures all have certain defects: (a) Top-supported arch with thrust: the site cannot provide thrust and the building height is limited; (b) Middle-supported arch with thrust: the site cannot provide thrust; (c) Flying bird arch: columns are generally set on the main arch ribs and the side arch ribs, and the columns do not meet the water resistance ratio and landscape requirements; (d) Bottom-supported rigid frame tied arch bridge: the piers have relatively large water resistance, the piers have large seismic forces, and the landscape effect is average; (e) Bottom-supported arch-beam composite structure: since there are no piers in the foundation, the building height requirements are not met.

[0024] The embodiment of the present invention takes into account that the building height of the Flying Bird Arch meets the restriction conditions, and the problem of water resistance ratio can be preliminarily solved by adjusting the main arch cross-section. Therefore, the structural form of the Flying Bird Arch is used as a basis for structural improvement, and the side hole longitudinal beams on each side are connected with the first cross beam and the auxiliary hole longitudinal beam on the same side to form a triangular rigid frame system between the side hole longitudinal beams, the main arch arch ribs, and the side arch arch ribs, thereby reducing the seismic force at each key control position (main arch crown, main arch foot, side arch crown, side arch foot), and the internal force of the side arch crown under static and dynamic conditions is greatly reduced.

[0025] Specifically, the position relatively close to the center line of the arch bridge facade is the inner side, and the position relatively far from the center line of the arch bridge facade is the outer side. The arch bridge structure of the embodiment of the present invention includes two groups of arch ribs, and each group of arch ribs includes a main arch rib and side arch ribs on both sides. The two ends of the main arch rib are supported on the main piers on both sides, the inner ends of the side arch ribs are respectively supported on the main piers on both sides, and the outer ends are respectively supported on the auxiliary pier cross beams on both sides. Two opposite main arch ribs are provided with two first cross beams, and the two first cross beams are symmetrical along the center line of the arch bridge facade and are arranged below the bridge deck. The longitudinal beams of the arch bridge include a central hole longitudinal beam, side hole longitudinal beams on both sides of the central hole longitudinal beam, and auxiliary hole longitudinal beams on both sides of the side hole longitudinal beam. The two ends of the central hole longitudinal beam are supported on the first cross beams on both sides, and each side hole longitudinal beam is fixedly connected to the first cross beam and the auxiliary hole longitudinal beam respectively.

[0026] According to an embodiment of the present invention, the side hole longitudinal beam adopts a split steel box beam, and the auxiliary hole longitudinal beam adopts a split prestressed concrete beam. The side hole longitudinal beam and the auxiliary hole longitudinal beam are fixedly connected via a steel-concrete joint section.

[0027] In the related art, a corbel is provided at the top of the side arch to hold down the weight, but there are still problems such as excessive deformation of the top corner of the side arch rib and hollowing of the support. The embodiment of the present invention arranges an additional auxiliary hole longitudinal beam on the outside of the side hole longitudinal beam. This can effectively limit the change of the side arch rib end angle and further reduce the internal force of each control position (main arch top, main arch foot, side arch top, side arch foot) under dynamic and static conditions without affecting the weighting effect.

[0028] Specifically, the middle hole longitudinal beam adopts steel beam, and the main structure is composed of two side longitudinal box beams and a middle longitudinal beam, a large crossbeam and cross ribs (including an orthogonal anisotropic bridge deck system). Both ends of the middle hole longitudinal beam are supported on the first crossbeam. The side hole longitudinal beam is a single-box four-chamber steel box beam divided into left and right sections, and an 80cm gap is set between the two side hole longitudinal beams. The side hole longitudinal beam adopts a steel beam, one end of which is connected to the first crossbeam, and the other end is connected to the auxiliary hole longitudinal beam through a steel-concrete joint section. The auxiliary hole longitudinal beam adopts a prestressed concrete box beam, which is a single-box four-chamber concrete box beam divided into left and right sections. An 80cm gap is set between the two auxiliary hole longitudinal beams, and an integral crossbeam is set at the auxiliary pier and the transition pier to connect the left and right concrete box beams into a whole.

[0029] The lower structure of the transition pier and auxiliary pier adopts V-shaped pier (including prestressed concrete upper tie beam), the top surface of the upper tie beam is horizontal without transverse slope, the middle part is 5m thick, the top surface is 2.65m wide, and the thickness of the pier column along the bridge direction is 2.2m and 2.4m respectively; it is connected to the pile foundation of the lower platform. The lower structure of the main pier adopts a special-shaped base connected to the arch rib on the top and the pile foundation of the lower platform.

[0030] According to an embodiment of the present invention, a plurality of through-length tie rods are arranged inside the longitudinal beam, and both ends are respectively anchored to the auxiliary hole longitudinal beam.

[0031] According to an embodiment of the present invention, the prestressing force to be applied to each of the through-length tie rods is:

[0032] Among them, P is the prestressing force, H is the arch foot thrust of the main arch rib, q is the uniformly distributed load on the arch, L is the design length of the full-length tie rod, and h is the vertical distance between the arch crown and the arch foot of the main arch rib.

[0033] According to an embodiment of the present invention, the initial length of the through-length tie rod is: Among them, L s is the initial length, E s is the elastic modulus of the full-length tie rod, A s is the cross-sectional area of ​​the full-length tie rod.

[0034] In the related art, there is an unbalanced thrust problem at the arch foot of the main arch. In the embodiment of the present invention, multiple full-length tie rods are arranged, and both ends are anchored in the auxiliary hole longitudinal beams on both sides, so that the horizontal thrust of the arch end is borne by the full-length tie rods, so that the arch end support does not generate horizontal thrust, which can meet the geological conditions with general geological conditions, weak rigidity and no thrust.

[0035] According to an embodiment of the present invention, the central-hole longitudinal beam is supported on the first cross beam via a pot-type rubber movable support and a viscous damper, and an expansion joint is arranged at the supporting position.

[0036] In the related technology, the problem of excessive deformation of the center-hole longitudinal beam due to temperature force exists. By adopting pot-type rubber movable bearings and viscous dampers to connect them and setting expansion joints, it is possible to buffer and reduce shock, adapt to the deformation and rotation of the bridge, and improve the seismic performance of the bridge, thus providing guarantee for the safe, stable and long-term operation of the arch bridge structure.

[0037] According to an embodiment of the present invention, it further comprises a plurality of suspension rods vertically connecting the main arch rib and the central hole longitudinal beam, and the distance between two adjacent suspension rods is 9m.

[0038] According to an embodiment of the present invention, the main arch ribs include: main arch upper ribs, located above the design water level of the arch bridge, and using a steel structure box arch; main arch lower ribs, located below the design water level, and using a reinforced concrete box arch.

[0039] Specifically, the main arch ribs above the design water level use steel structure five-sided box arches, and the main arch ribs below the design water level and the side hole arch ribs all use reinforced concrete special-shaped box arches. 48 sets of double hangers are set between the main arch ribs and the middle hole longitudinal beams, and the hangers are spaced 9m apart along the bridge.

[0040] According to an embodiment of the present invention, the area enclosed by the side hole longitudinal beam, the main arch rib and the side arch rib does not include supporting columns.

[0041] In the related art, supporting columns are arranged above the main arch ribs and the side arch ribs, which results in a relatively high water resistance ratio of the arch bridge and a relatively large impact on the landscape. The embodiment of the present invention greatly improves the stress condition of the arch ribs through a triangular rigid frame system, thereby satisfying the condition of removing the supporting columns above the main arch ribs and the side arch ribs. After removing the supporting columns, the water resistance ratio of the arch bridge structure is further reduced and the landscape requirements are met.

[0042] According to another embodiment of the present invention, a construction method of an arch bridge structure is provided, comprising: installing two groups of arch ribs, wherein each group of arch ribs comprises a main arch rib and side arch ribs on both sides thereof, the main arch ribs are fixedly connected to the main piers on both sides, and the side arch ribs are fixedly connected to the main piers and auxiliary pier cross beams; constructing a first cross beam below the bridge deck, fixedly connected between the two main arch ribs; constructing a center hole longitudinal beam along the longitudinal direction of the bridge, so that the two ends of the center hole longitudinal beam are respectively supported on the first cross beam on both sides; constructing a side hole longitudinal beam along the longitudinal direction of the bridge, the inner end of which is fixedly connected to the first cross beam; constructing an auxiliary hole longitudinal beam along the longitudinal direction of the bridge, fixedly connected to the outer end of the side hole longitudinal beam.

[0043] In addition, the arch bridge's piers are constructed with cofferdams, and a bottom concrete is set underneath. To ensure the appearance of each concrete component, the piers (including the upper tie beam), base, and reinforced concrete arch ribs are all cast with steel formwork.

[0044] The present invention has the following effects:

[0045] (1) It can adapt to geological conditions with general geological conditions, weak rigidity, and no thrust;

[0046] (2) Meet the requirement of water resistance ratio ≤5%;

[0047] (3) Adapt to conditions with high seismic fortification intensity (VIII and above) and high peak acceleration of ground motion (0.2g and above);

[0048] (4) Adapt to conditions where building height is limited (the height difference between the bridge deck and the riverbed or the ground is between 25m and 40m).

[0049] (5) It can meet the condition that no arch columns are provided on the arch ribs of the main arch or the side arch, further optimize the water resistance ratio and meet the landscape requirements.

[0050] The above embodiments are only examples for clearly explaining the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications may be made based on the following description, and these various changes, modifications, substitutions and deformations derived from the principles and spirit of the present invention still fall within the scope of protection of the present invention.

Claims

1. An arch bridge structure, comprising two groups of arch ribs, wherein each group of arch ribs comprises a main arch rib and side arch ribs on both sides thereof, the main arch ribs are fixedly connected to the main piers on both sides, and the side arch ribs are fixedly connected to the main pier and the auxiliary pier cross beam, characterized in that: Also includes: A first cross beam, located below the bridge deck, connecting the two main arch ribs; A longitudinal beam with a central hole, with two ends respectively supported on the first cross beams on both sides; A side hole longitudinal beam, the inner end of which is fixedly connected to the first cross beam; The auxiliary hole longitudinal beam is fixedly connected to the outer side end of the side hole longitudinal beam.

2. The arch bridge structure according to claim 1, characterized in that: The side hole longitudinal beam adopts a section-type steel box beam, and the auxiliary hole longitudinal beam adopts a section-type prestressed concrete beam. The side hole longitudinal beam and the auxiliary hole longitudinal beam are fixedly connected through a steel-concrete joint section.

3. The arch bridge structure according to claim 2, characterized in that: A plurality of through-length tie rods are arranged inside the longitudinal beam, and both ends are respectively anchored to the auxiliary hole longitudinal beam.

4. The arch bridge structure according to claim 3, characterized in that: The prestressing force to be applied to each of the through-length tie rods is: Among them, P is the prestressing force, H is the arch foot thrust of the main arch rib, q is the uniformly distributed load on the arch, L is the design length of the full-length tie rod, and h is the vertical distance between the arch top and the arch foot of the main arch rib.

5. The arch bridge structure according to claim 4, characterized in that: The initial length of the through-length tie rod is: Among them, L s is the initial length, E s is the elastic modulus of the full-length tie rod, A s is the cross-sectional area of ​​the through-length tie rod.

6. The arch bridge structure according to claim 1, characterized in that: The central hole longitudinal beam is supported on the first cross beam via a pot-type rubber movable support and a viscous damper, and an expansion joint is arranged at the supporting position.

7. The arch bridge structure according to claim 1, characterized in that: It also includes a plurality of suspension rods vertically connecting the main arch ribs and the center hole longitudinal beams, and the distance between two adjacent suspension rods is 9m.

8. The arch bridge structure according to claim 1, characterized in that: The main arch rib comprises: The arch rib on the main arch is located above the design water level of the arch bridge and adopts a steel structure box arch; The arch rib under the main arch is located below the design water level and adopts a reinforced concrete box arch.

9. The arch bridge structure according to any one of claims 1 to 8, characterized in that: The area enclosed by the side hole longitudinal beam, the main arch rib and the side arch rib does not include supporting columns.

10. A construction method for an arch bridge structure, characterized in that: include: Install two groups of arch ribs, wherein each group of arch ribs includes a main arch rib and side arch ribs on both sides thereof, the main arch ribs are fixedly connected to the main piers on both sides, and the side arch ribs are fixedly connected to the main pier and the auxiliary pier cross beam; A first cross beam is constructed below the bridge deck and fixedly connected between the two main arch ribs; A longitudinal beam with a central hole is constructed along the longitudinal direction of the bridge, so that two ends of the longitudinal beam with a central hole are supported on the first cross beams on both sides respectively; A side hole longitudinal beam is constructed along the longitudinal direction of the bridge, and the inner end of the side hole longitudinal beam is fixedly connected to the first cross beam; Auxiliary hole longitudinal beams are constructed along the longitudinal direction of the bridge and are fixedly connected to the outer ends of the side hole longitudinal beams.

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