Large-span steel-concrete combined arch bridge structure suitable for deep valley in mountainous area
The steel-concrete composite arch bridge structure solved the challenges of bridge construction under complex geological conditions in mountainous and deep valley areas, achieving rapid construction, reduced costs, improved structural stability, reduced ecological damage, and ensured the safety and durability of the bridge.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-03
- Publication Date
- 2026-03-10
AI Technical Summary
In mountainous and valley environments with complex and variable geological conditions, conventional bridge structures face challenges such as geological disasters, difficult foundation treatment, and severe ecological damage, making it difficult to achieve rapid construction, reduce costs, and improve structural stability and durability.
The bridge adopts a steel-concrete composite arch structure, which includes a combination of corrugated steel plates and reinforced concrete arch rings, combined with shear members and shear bolts. It is equipped with seismic anchor bars and liquid fly ash filler, and uses diaphragm walls and concrete piles to reinforce the foundation, avoiding large-scale excavation and enhancing structural stability and seismic resistance.
It enabled rapid bridge construction under complex geological conditions, reduced costs, improved structural stability and durability, reduced damage to the ecological environment, and ensured the long-term safe operation of the bridge.
Smart Images
Figure CN223983933U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of bridge construction technology, and in particular to a large-span steel-concrete composite arch bridge structure suitable for mountainous and deep valley areas. Background Technology
[0002] Bridges are crucial links connecting different regions and promoting economic development. However, with the rapid development of highway construction, bridge engineering faces numerous challenges in mountainous areas with complex and varied geological conditions, including deep valleys, gullies, and hilly terrain. This is especially true at the junctions of bridges and tunnels, where numerous gullies crisscross the landscape. Furthermore, the uneven geological conditions and secondary geological hazards (landslides, collapses, and debris flows) within these valleys severely impact the structural safety and stability of the proposed bridges.
[0003] 1. In mountainous areas with deep valleys and gullies, it is difficult to avoid the use of high piers or piers in the gullies when bridges cross them. This increases the potential threat to bridge safety from secondary geological disasters, which may cause direct or indirect damage to the bridge and affect its long-term stability and safety.
[0004] 2. Mountainous terrain is undulating and geological conditions are complex and varied. The geological composition may be a combination of rock, sand, soil, or a mixture of these, and is often accompanied by adverse geological phenomena such as faults and fissures. Foundation treatment becomes a crucial part of bridge construction. When a bridge crosses a valley, the foundation treatment in certain areas poses a great challenge to bridge construction, constantly testing the stability and safety of the bridge.
[0005] 3. When dealing with complex terrain and geological conditions, conventional bridges require large-scale excavation and protection of unfavorable geological conditions in the valley to ensure the safety and stability of the bridge structure. This causes serious damage to the regional ecology and may cause irreversible damage to the surrounding ecological environment.
[0006] In summary, in mountainous valleys with deep ravines and complex geology, there is an urgent need for new bridge and culvert structures to overcome the challenges faced by conventional bridges, eliminate threats to structural safety from adverse geological conditions, ensure long-term stability and safe operation of the structures, reduce damage to the ecological environment, adhere to the ecological protection principle of "prevention first, protection priority," and bring new breakthroughs and innovations to the construction technology of highway bridges and culverts in mountainous areas. Utility Model Content
[0007] To address the aforementioned problems, this utility model provides a large-span steel-concrete composite arch bridge structure suitable for mountainous and deep valley areas. It overcomes the shortcomings of existing bridge structures in mountainous and deep valley construction, achieving rapid construction, reduced costs, improved structural stability and durability, and meeting the needs of large-span bridge construction in mountainous and deep valley regions.
[0008] The specific technical solution of this utility model is as follows:
[0009] A large-span steel-concrete composite arch bridge structure suitable for mountainous and deep valleys includes a steel-concrete composite arch ring, reinforced concrete walls, reinforced concrete support beams, end walls, liquid fly ash, seismic anchor bars, crushed stone soil, and structural foundations.
[0010] The steel-concrete composite arch ring is composed of a corrugated steel plate and a reinforced concrete arch ring. The corrugated steel plate and the reinforced concrete arch ring are connected by shear members and shear bolts. The ends of the corrugated steel plate are connected to the reinforced concrete arch ring by fastening bolts and angle steel.
[0011] The reinforced concrete wall includes side walls and a central wall, which are connected by a support beam.
[0012] The end walls are located on both sides of the arch bridge entrance and exit of the structure;
[0013] The seismic anchor bars are set between the arch ring and the end wall and are welded to the main reinforcement bars of the arch ring.
[0014] The liquid fly ash is filled between the reinforced concrete arch rings;
[0015] The crushed stone soil was filled on the reinforced concrete arch and liquid fly ash;
[0016] The structural foundation includes diaphragm walls and concrete piles, which are installed at the bottom of the reinforced concrete wall.
[0017] Furthermore, the rise-to-span ratio of the steel-concrete composite arch ring is 1 / 2.
[0018] Furthermore, the corrugated steel sheet is connected to the reinforced concrete wall using anchor bolts and angle steel.
[0019] Furthermore, the seismic anchor bars adopt double-layer anchor bars.
[0020] Furthermore, the structural foundation uses diaphragm walls for support in sections where the bottom surface of the reinforced concrete wall is ≤2m from the bedrock, and concrete piles are poured in sections where the bottom surface of the reinforced concrete wall is >2m from the bedrock.
[0021] Furthermore, both the diaphragm wall and the plain concrete piles are made of C30 concrete.
[0022] Furthermore, the concrete piles are arranged in a triangular quincunx pattern, and a C15 concrete cushion layer is provided for the concrete piles.
[0023] The beneficial effects of this utility model are as follows: Compared with conventional bridges, the large-span steel-concrete composite arch bridge structure suitable for deep valleys in mountainous areas provided by this utility model avoids setting up high piers in deep valleys and gullies, eliminating the potential threats to bridge safety from adverse geological conditions, etc. At the same time, the double-layer anchor bar 7 seismic structure set between the arch ring and the end wall 6 is conducive to ensuring the long-term stability and operational safety of the structure.
[0024] This invention is applicable to mountainous areas with complex geological conditions, intricate geological composition, poor uniformity, and frequent changes. Highly targeted measures are adopted in foundation treatment, implementing corresponding foundation reinforcement measures for areas with different geological characteristics to fully utilize the stable support of the rock strata, ensuring the overall stability of the foundation. These targeted foundation treatment measures comprehensively strengthen the structural foundation, significantly improving its bearing capacity.
[0025] Furthermore, when dealing with complex terrain and geological conditions, this utility model adopts measures such as backfilling and counter-pressure and setting end walls 6, which eliminates the need for large-scale excavation and protection of the original valleys. This effectively inhibits the further development of adverse geological conditions (landslides and collapses) on both sides of deep valleys and gullies, weakens the harmful effects of adverse geological conditions, greatly protects the natural landform features of the ecological environment, and effectively maintains the ecological balance of the region. Attached Figure Description
[0026] Figure 1 This utility model provides a structural diagram of a large-span steel-concrete composite arch bridge suitable for mountainous and deep valley areas;
[0027] Figure 2 A three-dimensional schematic diagram of the installation of the corrugated steel plate provided for this utility model;
[0028] Figure 3 A diagram illustrating the connection method between the corrugated steel plate and the reinforced concrete arch ring provided by this utility model;
[0029] Figure 4 The connection diagram of the shear member and shear screw provided by this utility model;
[0030] Figure 5 A diagram showing the connection between the corrugated steel plate and the reinforced concrete wall base provided by this utility model;
[0031] Figure 6 A schematic diagram of the backfill structure provided for this utility model;
[0032] Figure 7 Schematic diagram of the structural foundation treatment plan provided by this utility model Figure 1 ;
[0033] Figure 8 Schematic diagram of the structural foundation treatment plan provided by this utility model Figure 2 .
[0034] The following are shown in the diagram: 1. Corrugated steel plate; 2. Reinforced concrete arch ring; 3. Side wall of wall #1; 4. Side wall of wall #2; 5. Support beam; 6. End wall; 7. Anchor bar; 8. Shear member; 9. Fastening bolt; 10. Anchor bolt; 11. Angle steel; 12. C15 concrete; 13. Crushed stone and soil; 14. Liquid fly ash; 15. Shear bolt; 16. Cap stone; 17. Diaphragm wall; 18. Concrete pile. Detailed Implementation
[0035] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments:
[0036] Example 1
[0037] like Figure 1 and Figure 2 As shown, this utility model provides a large-span steel-concrete composite arch bridge structure suitable for mountainous and deep valley areas.
[0038] A large-span steel-concrete composite arch bridge structure suitable for mountainous and deep valleys includes a steel-concrete composite arch ring, reinforced concrete walls, reinforced concrete support beams 5, concrete end walls 6, liquid fly ash 14 arch protection filler, seismic anchor bars 7, crushed stone soil 13 backfill and structural foundation.
[0039] The steel-concrete composite arch ring is connected to the reinforced concrete arch ring 2 via shear members 8, and the ends of the steel corrugated plate 1 are connected to the reinforced concrete arch ring 2 via fastening bolts 9 and angle steel 11. The steel corrugated plate 1 is factory-manufactured and quickly assembled on site. The installed steel corrugated plate 1 arch ring not only serves as part of the structure but also provides a stable construction platform for the subsequent pouring of the concrete arch ring, thus enabling rapid construction without scaffolding. Furthermore, the steel-concrete composite structure cleverly integrates the durability of concrete structures with the lightweight and high-strength characteristics of steel structures, making it a highly regarded composite structural form in current design fields. The rise-to-span ratio of the steel-concrete composite arch ring is generally 1 / 2, and the model of the steel corrugated plate 1 and the thickness of the reinforced concrete arch ring 2 are determined by calculation based on the actual fill height of the roadbed. When the fill height exceeds 20m, Q35 low alloy steel CSPS corrugated plates with a wave pitch of 381mm, a wave depth of 140mm, and a wall thickness of 10mm are generally used. The reinforced concrete arch ring 2 uses a C40 arch ring with a wall thickness of 650mm. The corrugated steel plate 1 and the reinforced concrete arch ring 2 are connected by shear members 8 and shear bolts 15 arranged with a circumferential spacing of 500mm and a transverse spacing of 762mm to form a steel-concrete composite structure. The corrugated steel plate 1 is connected to the reinforced concrete wall by anchor bolts 10 and angle steel 11 evenly distributed.
[0040] The reinforced concrete wall, serving as a solid foundation for the steel-concrete composite arch, is divided into side walls 3 and a central wall 4. The side walls 3 and central wall 4 are connected by support beams 5, forming an overall frame structure. This provides a solid foundation for the large-span steel-concrete composite arch bridge structure suitable for deep valleys in mountainous areas, as described in this utility model. The reinforced concrete wall adopts an inverted T-shaped structure based on structural stress and application. In this utility model, the side walls have a top width of 1400mm, a bottom width of 2900mm, and a height of 3500mm; the central walls have a top width of 2200mm, a bottom width of 4200mm, and a height of 3500mm, and are constructed using C30 concrete. The reinforced concrete support beams 5 are a crucial part of the foundation, not only bearing part of the soil and structural weight but also ensuring the overall stability and safety of the culvert. The support beams 5 are 80cm high and 50cm wide, constructed of C30 concrete, effectively distributing and transferring loads, and possessing sufficient bending and tensile / compressive resistance. End walls 6 are located on both sides of the arch bridge entrance and exit of the structure. Their main function is to retain soil and ensure structural stability. End walls 6 are embedded deep in the soil, and through their strong lateral force resistance, they effectively maintain the stability of the overall structure. As a closed structure for the entrance and exit, end walls 6 can not only effectively block the intrusion of external soil or water flow, but also guide water flow to a certain extent, ensuring smooth water flow in the channel and reducing erosion and siltation.
[0041] Seismic anchor bars 7 are installed between the arch ring and the end wall 6. Referring to the seismic design of tunnel portals, double-layer anchor bars 7 are used to connect the arch ring and the end wall 6. The anchor bars 7 have a diameter of 20mm and a circumferential spacing of 20cm. The anchor bars 7 are welded to the main reinforcement of the arch ring. The purpose of the seismic anchor bars 7 is to enhance the stability and safety of the arch ring structure under extreme natural disasters such as earthquakes. The anchor bars 7 penetrate deep into the stable rock or soil surrounding the arch ring, tightly connecting the arch ring structure with the surrounding geological environment to form an integrated load-bearing system, thereby effectively resisting the horizontal and vertical forces generated by seismic waves.
[0042] Liquid fly ash 14 is used as arch support filler, placed between the reinforced concrete arch rings 2. It is a high-quality synthetic backfill material with low apparent density but high strength. This material has good fluidity, hydraulic properties, and economy, and is particularly suitable for backfilling of arched and unconventional structures, ensuring the compactness and stability of the backfill layer.
[0043] Crushed stone soil 13 is filled on the reinforced concrete arch ring 2 and liquid fly ash 14. Crushed stone soil 13 is a mixed soil composed of larger crushed stone particles and smaller soil particles. It is widely available and easy to obtain. After compaction, it has the advantages of high strength, low deformation and good permeability, making it a good backfill and foundation treatment material.
[0044] The structural foundation is a foundation after ground treatment for different ground conditions. Specifically, in the section where the bottom surface of the reinforced concrete wall is ≤2m from the foundation rock layer, diaphragm wall 17 is used for support. The diaphragm wall 17 should be embedded in the rock mass at least ≥50cm to make full use of the stable support of the rock layer. In the section where the bottom surface of the reinforced concrete wall is >2m from the foundation rock layer, C15 plain concrete piles 18 are used for treatment. The concrete piles 18 are arranged in a triangular staggered pattern, with a pile diameter of 60cm and a spacing of 150cm. They are made of C30 concrete, and a 10cm thick C15 concrete 12 cushion layer is set on the top of the piles. The cushion layer is constructed by static pressure method. The piles are constructed sequentially, skipping between piles, in order to ensure the overall stability of the foundation.
[0045] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention.
[0046] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.
Claims
1. A large-span steel-concrete composite arch bridge structure suitable for mountainous deep valleys, characterized in that, The structure comprises a steel-concrete composite arch ring, a reinforced concrete wall body, a reinforced concrete support beam (5), an end wall (6), liquid fly ash (14), anti-seismic anchor bars (7), gravel soil (13) and a structural foundation; The steel-concrete composite arch ring is composed of a steel corrugated plate (1) and a reinforced concrete arch ring (2), and the steel corrugated plate (1) and the reinforced concrete arch ring (2) are connected by a shear element (8) and a shear screw (15); the end of the steel corrugated plate (1) is connected with the reinforced concrete arch ring (2) through a fastening bolt (9) and an angle steel (11); The reinforced concrete wall body comprises a side wall (3) and a middle wall (4), and the side wall (3) and the middle wall (4) are connected by a support beam (5); The end wall (6) is located on both sides of the arch bridge entrance and exit of the structure; The anti-seismic anchor bars (7) are arranged between the arch ring and the end wall (6) and are welded with the main reinforcement of the arch ring; The liquid fly ash (14) is filled between the reinforced concrete arch rings (2); The gravel soil (13) is filled on the reinforced concrete arch ring (2) and the liquid fly ash (14); The structural foundation comprises a diaphragm wall (17) and a concrete pile (18) arranged at the bottom of the reinforced concrete wall body.
2. The long-span steel-concrete composite arch bridge structure suitable for mountainous deep valleys according to claim 1, characterized in that, The steel-concrete composite arch ring has a rise-span ratio of 1 / 2.
3. The long-span steel-concrete composite arch bridge structure suitable for mountainous deep valleys according to claim 1, characterized in that, The steel corrugated plate (1) is connected with the reinforced concrete wall body by a foundation bolt (10) and an angle steel (11).
4. The long-span steel-concrete composite arch bridge structure suitable for mountainous deep valleys according to claim 1, characterized in that, The anti-seismic anchor bars (7) are double-layer anchor bars.
5. The long-span steel-concrete composite arch bridge structure suitable for mountainous deep valleys according to claim 1, characterized in that, The diaphragm wall (17) is used to support the section of the reinforced concrete wall body bottom surface ≤2m from the foundation rock layer, and the concrete pile (18) is poured in the section of the reinforced concrete wall body bottom surface >2m from the foundation rock layer.
6. The long-span steel-concrete composite arch bridge structure suitable for mountainous deep valleys according to claim 5, characterized in that, The diaphragm wall (17) and the plain concrete pile (18) are both made of C30 concrete.
7. The long-span steel-concrete composite arch bridge structure suitable for deep valleys in mountainous areas according to claim 1, 5 or 6, characterized in that, The concrete pile (18) is arranged in a triangular plum blossom mode, and a C15 concrete (12) cushion layer is arranged on the concrete pile (18).