Semi-fabricated self-balancing arch bridge based on corrugated steel and construction method

Abstract

The invention belongs to the technical field of bridge engineering, and discloses a corrugated steel-based semi-fabricated self-balancing arch bridge rapid construction method, which comprises a hollow bridge body box erected between two bases, and the bridge body box is filled with a filling material; the bridge body box comprises bridge head steel boxes located on a base, and a wave-shaped arch box is arranged between the two bridge head steel boxes. The filling material comprises a first filler and a second filler, the corrugated arch box is filled with the first filler, and the bridge head steel box is filled with the second filler; the wave-shaped arch box comprises a wave-shaped arch rib connected between the two bridgehead steel boxes, and the upper portion of the wave-shaped arch rib is filled with the first filler. According to the structure system, rapid construction of a small-span bridge can be achieved, the structure system has the advantages of being reliable in performance, small in influence on the environment, low in manufacturing cost and the like, the structure system is a self-balancing system, and compared with a traditional stone arch bridge, the requirement for thrust resistance of an original foundation is strict, and the structure system has the wider application range and better environmental adaptability.

Description

Technical Field

[0001] The present invention belongs to the technical field of bridge engineering, and in particular relates to a semi-assembled self-balancing arch bridge based on corrugated steel and a construction method thereof. Background Art

[0002] Small-span bridges are in great demand in urban parks and rural roads, and they occupy an important position in the transportation network. Their construction efficiency and cost have a significant impact on transportation construction. Traditional small-span bridges are mainly constructed by pouring reinforced concrete, but this construction method has problems such as long construction period, difficult quality control, and high overall cost.

[0003] Existing small-span bridges are mainly constructed by prefabricated components and assembled parts; however, the prefabricated components of prefabricated component construction are large in size and weight, and the difficulty and cost of lifting and transportation are higher, and the difficulty and cost of transportation on rugged rural roads will be further increased; at the same time, the prefabricated component construction team has high construction site requirements, which increases the workload and difficulty of the site, and has high requirements for the level of construction technology. The construction process will also generate additional dust and noise pollution, which will affect the surrounding environment; and prefabricated bridges, as a green, standardized and rapid construction technology, have received more and more attention in recent years, but this type of bridge also faces the problems of poor integrity and insufficient durability in actual applications, and the factory prefabricated molds are difficult to adapt to the complex and changeable on-site environment. When the demand does not reach a certain scale, it also faces the problem of high cost.

[0004] Therefore, the present application designs a semi-assembled self-balancing arch bridge based on corrugated steel and a construction method to solve the above-mentioned technical problems. Summary of the invention

[0005] In order to solve the above technical problems, the present invention proposes a semi-assembled self-balancing arch bridge based on corrugated steel and a construction method, which can realize the rapid construction of small-span bridges and has the advantages of reliable performance, small impact on the environment, and low cost.

[0006] To achieve the above-mentioned object, the present invention provides a semi-assembled self-balancing arch bridge based on corrugated steel, which is erected on symmetrically arranged bases, and includes a bridge box erected in a hollow space between two of the bases, wherein the bridge box is filled with filling materials;

[0007] The bridge body box includes a bridge head steel box located on the base, a corrugated arch box for crossing the river channel is arranged between the two bridge head steel boxes, and the filling material is filled between the bridge head steel box and the corrugated arch box;

[0008] The filling material includes a first filler and a second filler, the first filler is filled in the corrugated arch box, and the second filler is filled in the bridge head steel box;

[0009] The corrugated arch box includes corrugated arch ribs connected between the two bridge head steel boxes, and the first filler is filled above the corrugated arch ribs.

[0010] Preferably, the bridge head steel box is hollowed out to form an arch foot box chamber, and the second filler is filled in the arch foot box chamber.

[0011] Preferably, the bottom end of the bridge head steel box is provided with a plurality of anti-slip structures arranged in an array, and the anti-slip structures abut against the top surface of the base.

[0012] Preferably, the first filler comprises lightweight foam concrete, and the second filler comprises high-density filler.

[0013] Preferably, the base comprises graded crushed stone.

[0014] Preferably, side panels are provided on both sides of the corrugated arch rib, the side panels are fixedly connected to the bridge head steel box, and the first filler is filled in the space enclosed by the corrugated arch rib and the side panels.

[0015] Preferably, a bridge deck is laid between the two side plates, and the bridge deck abuts against the top of the first filler; the bridge deck extends to both sides and is connected to the original road surface, and the bridge deck is located at the top of the corrugated arch box and abuts against the top of the second filler.

[0016] Preferably, a partition baffle is provided between the arch foot box chamber and the corrugated arch rib for separating the first filler from the second filler.

[0017] The present invention also discloses a semi-assembled self-balancing arch bridge construction method based on corrugated steel, comprising the following steps:

[0018] Conduct on-site inspections of the site conditions in the area where the bridge is to be constructed and obtain the load requirements of the bridge;

[0019] Design the bridge size based on the site conditions and load requirements;

[0020] Make the bridge head steel box and corrugated arch box in the inner field according to the designed dimensions, and transport the bridge head steel box and corrugated arch box to the bridge construction area;

[0021] preparing a first filler and a second filler as filler materials according to the designed kind and quantity, and transporting the first filler and the second filler to the bridge construction area;

[0022] The foundations are constructed on both sides of the river channel, and then the bridge head steel box and the corrugated arch box are assembled into a bridge box, and then the bridge box is erected on two foundations;

[0023] The second filler is then injected into the bridge head steel box. After the second filler solidifies to the design value, the first filler is filled into the corrugated arch box and cured to the design strength.

[0024] Preferably, the design of the bridge dimensions includes the thickness of the bridge box, the height of the bridge, the rise-span ratio, the length of the bridge head steel box along the longitudinal direction of the bridge, and the dimensions of the bottom corrugated arch rib.

[0025] Compared with the prior art, the present invention has the following advantages and technical effects: the present invention discloses a semi-assembled self-balancing arch bridge based on corrugated steel and a construction method, which is suitable for new construction and reconstruction projects of small-span bridges with environmental protection requirements and tight construction period; the bridge structure of the present invention is convenient for reasonably designing and customizing the bridge box according to the site size, the bridge box is hollow, which is convenient for production and transportation, the bridge box is filled with filling materials, and the filling materials in the bridge material box are all cheap materials, with low manufacturing cost and strong adaptability; in addition, the bridge structure of the present invention is prefabricated on-site, manufactured on-site according to the design, and then transported to the designated area for assembly and construction, and then filled, with fast construction speed, eliminating the trouble of setting up templates and brackets, saving manpower and material resources, and reducing the impact on the site environment; the structure of the present invention after construction has good integrity, has better durability than prefabricated buildings, and the structure is a self-balancing system, which has strict requirements on the thrust resistance of the original foundation compared to traditional stone arch bridges, and the structural system of the present invention has a wider range of applications and better environmental adaptability. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The drawings constituting a part of the present application are used to provide a further understanding of the present application. The illustrative embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0027] Figure 1 It is an axial view of a semi-assembled self-balancing arch bridge based on corrugated steel according to the present invention;

[0028] Figure 2 A bottom view of a semi-assembled self-balancing arch bridge based on corrugated steel according to the present invention;

[0029] Figure 3 A top view of a semi-assembled self-balancing arch bridge based on corrugated steel according to the present invention;

[0030] Figure 4 This is a schematic diagram of the main structure of a semi-assembled self-balancing arch bridge based on corrugated steel according to the present invention;

[0031] Figure 5 This is a schematic diagram of the anti-slip structure of the present invention;

[0032] Figure 6 This is a front view of the bridge box of the present invention;

[0033] Figure 7 for Figure 6 Schematic diagram of the cross section of AA;

[0034] Figure 8 for Figure 6 Schematic cross-section of the middle BB;

[0035] Fig. 9 for Figure 6 Schematic cross-section of the CC;

[0036] Fig.10 Schematic diagram of the top view of the first filler and the second filler

[0037] Fig.11 for Fig.10 Schematic cross-section of the middle DD;

[0038] Fig.12 It is a schematic diagram of the dimensions of the bridge box of the present invention;

[0039] In the figure: 1. Corrugated arch rib; 2. Bridge head steel box; 3. First filler; 4. Second filler; 5. Anti-slip structure; 6. Graded crushed stone; 7. Bridge box; 8. Bridge secondary arch; 9. Base; 10. Arch foot box chamber; 11. Bridge deck; 12. Guardrail; 13. Partition baffle. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. 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.

[0041] Small span bridges are an important type of bridge engineering.

[0042] 1. Definition and Classification

[0043] Small-span bridges usually refer to bridges with smaller spans. There are different classification standards for their specific span ranges. One view is that small-span bridges refer to bridges with a span of less than 12 meters, another view is that the span of small-span bridges should be less than 10 meters, and another view is that the span of small-span bridges should be less than 3 meters. These different classification standards may be derived from different industry specifications, regional differences or engineering practice requirements. But in any case, the main characteristics of small-span bridges are simple structure, convenient construction and low cost.

[0044] 2. Structural form

[0045] Small-span bridges usually adopt simple beams, reinforced concrete slab beams, straight beams, arch structures, cantilevers or cantilever bridges and other structural forms. These structural forms have the advantages of convenient construction, low cost, and good seismic performance. In addition, small-span bridges may also adopt steel truss bridges, concrete beam bridges and other structural forms to meet different engineering needs.

[0046] 3. Common Types and Applications

[0047] Pedestrian bridge: A pedestrian bridge is a bridge designed for pedestrians, usually located in parks, scenic spots, urban pedestrian streets, etc. Small-span pedestrian bridges have simple structures and are easy to construct, providing pedestrians with a safe and convenient way to travel.

[0048] Pedestrian bridge: Pedestrian bridge is an important passage connecting the two sides of the city street, usually located in the bustling commercial district, transportation hub and other places. Small span pedestrian bridge has the advantages of low cost and short construction period, and is an important part of urban transportation construction.

[0049] Other types: In addition to pedestrian bridges and pedestrian overpasses, small-span bridges also include culverts, drainage pipes and other structural forms. These structural forms have been widely used in urban roads, rural roads and other places, providing a strong guarantee for the smooth flow of traffic.

[0050] 4. Features and advantages

[0051] Simple structure: The structural form of small-span bridges is relatively simple, easy to construct and maintain. This reduces engineering difficulty and cost and improves construction efficiency.

[0052] Low cost: Due to its simple structure and convenient construction, the cost of small-span bridges is relatively low. This makes small-span bridges more cost-effective in transportation construction.

[0053] Good earthquake resistance: Small-span bridges usually adopt simple structures, which makes them have good earthquake resistance. When natural disasters such as earthquakes occur, small-span bridges can maintain good stability and safety.

[0054] V. Development Trends and Prospects

[0055] With the acceleration of urbanization and the continuous growth of traffic demand, the role of small-span bridges in traffic construction will become increasingly important. In the future, the development of small-span bridges will show the following trends:

[0056] Technological innovation: With the continuous advancement of science and technology, the construction technology of small-span bridges will continue to innovate and improve. New construction methods and materials will continue to emerge to improve the construction efficiency and quality of small-span bridges.

[0057] Intelligent development: With the continuous development of intelligent transportation systems, small-span bridges will gradually realize intelligent management. By installing intelligent facilities such as sensors and monitoring equipment, the operation status and traffic flow of bridges can be monitored in real time, improving the safety and traffic efficiency of bridges.

[0058] Environmental protection and sustainable development: Under the concept of environmental protection and sustainable development, the design and construction of small-span bridges will pay more attention to environmental protection and energy saving. Environmentally friendly materials and construction techniques will be used to reduce the impact of bridges on the environment and achieve sustainable development.

[0059] In summary, small-span bridges play an important role in transportation construction. In the future, with the continuous advancement of technology and the renewal of concepts, small-span bridges will usher in a broader development prospect.

[0060] The present invention needs to calculate the rise-to-span ratio when designing. The rise-to-span ratio refers to the ratio of the calculated rise height S of the arch ring (or rib arch) in the arch bridge to the calculated span L (S / L), also known as the rise, or the ratio of the net rise height to the net span. It is used to characterize the steepness of the arch and is an important indicator reflecting the stress characteristics of the arch bridge. The following is a detailed explanation of the rise-to-span ratio:

[0061] 1. Definition and Calculation

[0062] Definition: The rise-to-span ratio is an important parameter in arch bridge structure, which reflects the steepness of the arch.

[0063] Calculation: The calculation of the rise is the vertical distance S from the centroid of the arch section to the line connecting the centroids of the two adjacent arch foot sections; the calculation of the span for arch bridges refers to the horizontal distance between the centroids of the two adjacent arch foot sections, that is, the horizontal distance L between the two end points of the arch axis. The rise-span ratio is the ratio of the two.

[0064] 2. Impact and Effect

[0065] Influence on the internal force of the arch ring: The change of the rise-to-span ratio will directly affect the internal force distribution of the arch ring. Generally speaking, when the rise-to-span ratio decreases, the thrust of the arch increases, and the axial force generated in the arch ring also increases accordingly, which is beneficial to the stress condition of the arch ring, but not to the pier foundation.

[0066] Influence on the structural form of arch bridge: The rise-to-span ratio not only affects the magnitude of the internal force of the arch ring, but also affects the structural form and construction method of the arch bridge. For example, an arch bridge with a rise-to-span ratio less than 1 / 5 is called a flat arch, and an arch bridge with a rise-to-span ratio greater than or equal to 1 / 5 is called a steep arch. When designing, the rise-to-span ratio should be selected after comprehensive comparison.

[0067] Impact on construction methods: When the rise-to-span ratio of the arch is too large, the arch foot section is too steep, which makes it difficult to lay the arch ring or pour concrete. Therefore, when choosing a construction method, the impact of the rise-to-span ratio needs to be considered.

[0068] 3. Applications and Examples

[0069] In actual engineering, the selection of span-rise ratio needs to be determined according to specific engineering conditions and design requirements. For example, in a cableway bridge, in order to meet the requirements of driving at the span end, the span-rise ratio of the main cable must be less than 1 / 35. In an arch-assisted beam bridge, the reasonable span-rise ratio range can be determined through the analysis of dynamic and static characteristics.

[0070] In summary, the rise-to-span ratio is an important parameter in the design and construction of arch bridge structures. It reflects the steepness of the arch and affects the stress characteristics, structural form and construction method of the arch bridge. In actual engineering, it is necessary to determine a reasonable rise-to-span ratio based on specific engineering conditions and design requirements.

[0071] The technical solution of the present invention uses lightweight foam concrete, which is also called lightweight concrete or foam concrete, and is a new type of lightweight thermal insulation material. The following is a detailed introduction to it:

[0072] 1. Definition and production process

[0073] Lightweight foamed concrete is a new type of lightweight thermal insulation material with a large number of closed pores, which is formed by mechanically foaming the foaming agent through the foaming system of the foaming machine, uniformly mixing the foam with cement slurry, and then pouring it into place or forming it into a mold through the pumping system of the foaming machine, and then curing it naturally. Its production process usually involves mixing cement, water, foaming agent, foam stabilizer, sand, fly ash and other aggregates in a certain proportion and stirring them fully, and then transporting them to the construction site through special conveying equipment for pouring and curing.

[0074] 2. Main features

[0075] Lightweight and high strength: The dry volume density of lightweight foam concrete is generally 180-300kg / m 3 , which is equivalent to about 1 / 10-1 / 3 of clay bricks, and at the same time has higher strength and can meet the load-bearing requirements.

[0076] Thermal insulation: Due to the large number of closed pores inside, lightweight foam concrete has excellent thermal insulation properties, low thermal conductivity, and can effectively reduce energy consumption.

[0077] Waterproof performance: Cast-in-place lightweight foam concrete has low water absorption, relatively independent closed bubbles and good integrity, which makes it waterproof to a certain extent. By adding waterproofing agent, its waterproof performance can be further improved.

[0078] Sound insulation and fire resistance: Lightweight foam concrete contains a large number of independent bubbles, which are evenly distributed, and the sound absorption capacity is 0.09-0.19%, which is 5 times that of ordinary concrete, and has the function of effective sound insulation. At the same time, it also has excellent fire resistance, does not burn, and the fire resistance limit is greater than three hours.

[0079] Good earthquake resistance: The porosity gives it a lower elastic modulus, which has a good absorption and dispersion effect on impact loads. Therefore, the earthquake resistance of buildings using lightweight foam concrete will be increased.

[0080] Easy construction: Lightweight foam concrete can be poured on site and is tightly integrated with the main structural layer, which simplifies the construction process and shortens the construction period.

[0081] 3. Scope of application

[0082] Lightweight foam concrete is widely used in building filling (including filling between basement top slab beams, adjustment filling when basement structure is not uniform, equipment foundation pit filling, etc.), floor insulation layer (floor heating) cushion layer, roof insulation waterproof layer, etc. Its excellent performance makes it play an increasingly important role in construction projects.

[0083] IV. Precautions

[0084] During the raw material preparation stage, each material must be strictly inspected to ensure quality. In particular, foaming agents and foam stabilizers must be selected, which have stable performance and are environmentally friendly.

[0085] Mix ratio design is a key link in foam concrete construction. It needs to be comprehensively considered based on factors such as project requirements, raw material properties and climatic conditions, and the optimal parameters must be determined through experiments.

[0086] During the construction process, factors such as mixing speed and time, smoothness of the delivery pipeline, pouring speed and pouring thickness should be strictly controlled to ensure the uniformity and stability of the foam concrete.

[0087] After pouring, maintenance should be carried out in time to ensure the strength and durability of the foam concrete.

[0088] In summary, lightweight foam concrete has many advantages and broad application prospects, and is an indispensable new material in construction projects.

[0089] The existing patent discloses a stone arch bridge reinforced with a corrugated steel plate (CN213625172U), including an arch bridge body and a pier installed at the lower end of the arch bridge body. The arch surface of the arch bridge body is respectively bonded and connected with a protective pad and a buckle connected with a curved steel plate. The protective pad is made of soft rubber material and plays a protective role on the arch surface of the arch bridge body. The protective pad and the curved steel plate are filled with sound insulation filler, which is a sponge. The sound insulation filler reduces the sound generated by the vibration of the arch bridge body, thereby reducing its vibration amplitude, and plays a role of auxiliary protection while playing a role of sound insulation. A waterproof coating is laid on the outer surface of the curved steel plate, and the waterproof coating can be an acrylic waterproof coating Materials, etc., the waterproof coating has a good waterproof treatment for the curved steel plate, avoiding rust caused by contact with external air and moisture, affecting its structural strength. A corrugated steel plate is placed between the protective pad and the curved steel plate. The corrugated steel plate has a polygonal structure to improve its compressive strength. It is evenly laid between the protective pad and the curved steel plate, and provides multi-point pressure reinforcement for the arch surface of the arch bridge body, thereby improving the pressure-bearing performance of the curved steel plate. The protective pad and the curved steel plate are respectively provided with grooves and main threaded holes. The main threaded holes are first-step hole structures, and the corrugated steel plate is provided with secondary threaded holes. The grooves, the main threaded holes and the secondary threaded holes are threadedly connected with fixing screws, and the fixing screws fix the corrugated steel plate.

[0090] A fixing block is bolted to the pier, and a preset hole is provided on the fixing block. An expansion bolt is inserted into the preset hole. The protruding end of the expansion bolt is inserted into the embedded hole in the pier. The expansion bolt fixes the fixing block. An insert block is welded on the fixing block. Connecting blocks are welded on both sides of the bottom end of the arc-shaped steel plate. A slot is provided on the connecting block. The insert block is inserted into the slot. A threaded groove is provided on the insert block. The threaded groove is connected to the slot. A threaded hole is provided on the inner wall of the upper end of the slot. A screw is connected to the threaded groove and the inner thread of the threaded hole. The screw fixes the insert block on the connecting block, thereby fixing the arc-shaped steel plate.

[0091] In the process of reinforcing the arch bridge body, the operator first glues the protective pad to the arch surface of the arch bridge body, then glues the sound insulation filler to the inner surface of the protective pad, and then installs a corrugated steel plate on the curved steel plate. The corrugated steel plate is threadedly connected to the auxiliary threaded hole through the fixing screw on the curved steel plate for fixing. Then, the curved steel plate is installed on the outer surface of the sound insulation filler so that the protruding end of the fixing screw on the corrugated steel plate is inserted into the groove on the protective pad. Furthermore, an embedded hole is drilled out on the pier with an electric rotary, and the fixing block is placed on the pier so that the preset hole on the fixing block is aligned with the pre- Corresponding to the buried holes, the expansion bolts are driven into the preset holes and the embedded holes to fix the fixing blocks. At the same time, it is necessary to ensure that the plug blocks on the fixing blocks are inserted into the connecting blocks on both sides of the bottom end of the arc-shaped steel plate, and the plug blocks are inserted into the slots on the connecting blocks. The screw threads are connected to the threaded holes and the threaded grooves to fix the plug blocks. During the daily use of the arch bridge body, the downward pressure generated by the inner arch surface is transmitted to the arc steel plate through the corrugated steel plates. The deformation of the corrugated steel plates greatly reduces the bearing pressure of the arch bridge body, and can reinforce and support the arch surface of the arch bridge body at multiple points, with the characteristics of good reinforcement effect.

[0092] At the same time, another existing patent discloses a corrugated steel arch bridge (CN218466312U), including a plurality of piers arranged on the foundation, each pier is provided with embedded parts, the embedded parts include embedded bolts and embedded angle steels; a corrugated steel arch bridge assembly is fixedly connected between the plurality of piers, the corrugated steel arch bridge assembly includes a corrugated plate arch ring, which is located in the center of the bridge body, and the two ends of the corrugated plate arch ring are fixed between the two piers through embedded parts; a plurality of corrugated support longitudinal plates are respectively arranged on both sides and the upper end surface of the corrugated plate arch ring, and the plurality of groups of corrugated support longitudinal plates are parallel to each other, and the length of their arrangement is the same as that of the bridge deck, the lower ends of the plurality of groups of corrugated support longitudinal plates are respectively fixed to the piers through embedded parts, and the upper ends of the plurality of groups of corrugated support longitudinal plates are connected to the bridge deck, and the roadbed and bridge deck are filled and paved on the bridge deck.

[0093] Since the upper end surface of the corrugated plate arch ring is an arc surface with a changing curvature, in order to ensure the firm connection between the corrugated support longitudinal plate and the corrugated plate arch ring, they are connected by a special-shaped corrugated angle steel, which has a certain curvature, and its bending angle is the same as the angle formed by each supporting longitudinal plate and the corrugated plate arch ring. The waveform of the special-shaped corrugated angle steel is also exactly the same as the waveform of the corrugated support longitudinal plate and the corrugated plate arch ring. The special-shaped corrugated angle steel can be completely overlapped with the corrugations of the corrugated support longitudinal plate and the corrugated plate arch ring and then bolted by high-strength bolts. This structure has strong reliability. The upper end of the corrugated support longitudinal plate is connected to a corrugated connecting piece, which is a flat corrugated sheet structure. The waveform of the corrugated connecting piece is the same as that of the bridge plate. The corrugated connecting piece is overlapped with the corrugations of the lower end surface of the bridge plate and then connected by high-strength bolts.

[0094] In order to further enhance the overall mechanical strength of the bridge body, at least one corrugated steel angle structure is connected by high-strength bolts at the right angles on both sides where the corrugated support longitudinal plate is vertically connected to the bridge deck. The waveform of the corrugated steel angle structure is the same as that of the bridge deck and the corrugated support longitudinal plate, and it is bolted to the corrugated support longitudinal plate and the bridge deck after overlapping.

[0095] The corrugated plate arch ring, corrugated supporting longitudinal plate and bridge plate are all connected by multiple corrugated steel plates. In this embodiment, multiple corrugated steel plates are stacked through the peaks and troughs of their edges and then bolted into sheets or arches through high-strength bolts; in other embodiments, flanges are arranged around the corrugated steel plates, and multiple corrugated steel plates are bolted or welded into sheets or arches through flanges. Foam sealing gaskets are arranged in the overlapping gaps between every two stacked corrugated steel plates or in the gaps between the butt flanges, and the outer walls of the corrugated steel plate layers are coated with anti-corrosion coatings. The above arrangement improves the rigidity, durability, earthquake resistance and fire resistance of the bridge structure, solves the corrosion problem of the arch ring of the structure to a certain extent, thereby reducing the cost of later reinforcement and maintenance of the arch ring, and more importantly, it can increase the span of the corrugated plate arch ring.

[0096] In a feasible solution of the patent, the upper end of a single corrugated plate arch is directly connected to the bridge deck, and a plurality of corrugated supporting longitudinal plates are respectively arranged in parallel on both sides of the corrugated plate arch and in parallel in the gap space formed by the corrugated plate arch and the bridge deck.

[0097] In another possible implementation of the present application, a corrugated steel arch bridge is disclosed, including a plurality of piers arranged on a foundation, each pier having embedded parts, the embedded parts including embedded bolts and embedded angle steels; a corrugated steel arch bridge assembly is fixedly connected between the plurality of piers, the corrugated steel arch bridge assembly including a plurality of corrugated plate arch rings, namely a large corrugated plate arch ring located in the center of the bridge body and a plurality of small corrugated plate arch rings arranged on the upper end surface or both sides of the large corrugated plate arch ring. In the present embodiment, the small corrugated plate arch rings are arranged on the upper end surface of the large corrugated plate arch rings to form a structural form similar to that of the "Zhaozhou Bridge", and the plurality of small corrugated plate arch rings are symmetrically arranged; on both sides of the large corrugated plate arch rings, in the gap space formed by the large corrugated plate arch rings and the bridge deck, A number of corrugated support longitudinal plates are respectively arranged on the upper end surface of the small corrugated plate arch ring, and the multiple groups of corrugated support longitudinal plates are parallel to each other; the lower ends of the corrugated support longitudinal plates on both sides of the large corrugated plate arch ring are respectively fixed on the bridge piers through embedded parts, and the upper ends are connected to the bridge deck through corrugated connecting plates, and are reinforced by corrugated steel angle steel structure; corrugated support longitudinal plates are also arranged in the gap space formed by the large corrugated plate arch ring and the bridge deck, and the corrugated support longitudinal plates are connected to the large corrugated plate arch ring through special-shaped corrugated angle steels, and the upper ends are connected to the bridge deck through corrugated connecting plates, and are reinforced by corrugated steel angle steel structure; the connecting surface between the small corrugated plate arch ring and the large corrugated plate arch ring is reinforced by special-shaped corrugated angle steels, and the connection method of the corrugated support longitudinal plates at the upper end of the small corrugated plate arch ring is the same as that of the large corrugated plate arch ring.

[0098] In another possible implementation scheme of the present application, the upper end surfaces of the large corrugated plate arch ring and the small corrugated plate arch ring are not directly connected to the bridge deck, but are connected to the bridge deck through the corrugated supporting longitudinal plates connected to their upper ends; the specific connection method of the corrugated supporting longitudinal plates and the bridge deck, bridge piers and corrugated plate arch rings is the same as that in the embodiment.

[0099] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0100] Reference Figure 1-Figure 12 As shown, this embodiment provides a semi-assembled self-balancing arch bridge based on corrugated steel, which is erected on symmetrically arranged bases 9, including a bridge box 7 erected in a hollow space between two bases 9, and the bridge box 7 is filled with filling materials;

[0101] The bridge body box 7 includes a bridge head steel box 2 located on a base 9, a corrugated arch box for crossing the river channel is arranged between the two bridge head steel boxes 2, and filling materials are filled between the bridge head steel box 2 and the corrugated arch box;

[0102] The filling material includes a first filler 3 and a second filler 4, the first filler 3 is filled in the corrugated arch box, and the second filler 4 is filled in the bridge head steel box 2;

[0103] The corrugated arch box comprises a corrugated arch rib 1 connected between two bridge head steel boxes 2, and a first filler 3 is filled above the corrugated arch rib 1.

[0104] The present invention discloses a semi-assembled self-balancing arch bridge based on corrugated steel and a construction method, which is suitable for new construction and reconstruction projects of small-span bridges with environmental protection requirements and tight construction period; the bridge structure of the present invention is convenient for reasonably designing and customizing the bridge box 7 according to the on-site size, the bridge box 7 is hollow, which is convenient for production and transportation, the bridge box 7 is filled with filling materials, and the filling materials in the bridge material box are all cheap materials, with low manufacturing cost and strong adaptability; in addition, the bridge structure of the present invention is prefabricated on-site, manufactured on-site according to the design, and then transported to a designated area for assembly and construction, and then filled, with fast construction speed, eliminating the trouble of setting up templates and brackets, saving manpower and material resources, and reducing the impact on the on-site environment; the structure of the present invention after construction has good integrity, has better durability than prefabricated buildings, and the structure is a self-balancing system, compared with the traditional stone arch bridge, which has strict requirements on the thrust resistance of the original foundation, the structural system of the present invention has a wider range of applications and better environmental adaptability.

[0105] In one embodiment of the present application, two symmetrically arranged bridge body auxiliary arches 8 are provided on the corrugated arch box, which can improve the structural strength of the corrugated arch box while reducing the overall weight. At the same time, they can assist in drainage when the water level is too high, have flood discharge capacity, avoid obstruction of water flow, and can also serve as the side wall of the arch foot box chamber 10 to support the second filler.

[0106] To further optimize the scheme, the bridge head steel box 2 is hollowed out to form an arch foot box chamber 10, and the second filler 4 is filled in the arch foot box chamber 10. The bridge head steel box 2 is designed as a hollow structure, which is formed by welding plates according to the designed size to form the arch foot box chamber 10, which is convenient for transportation and hoisting and splicing; after hoisting in place, the second filler 4 is filled inside to form a stable structure, which improves the construction efficiency and reduces the construction cost.

[0107] To further optimize the solution, the bottom end of the bridge head steel box 2 is provided with a plurality of anti-slip structures 5 arranged in an array, and the anti-slip structures 5 abut against the top surface of the base 9. The anti-slip structures 5 are a plurality of small structures protruding from the bottom ends of both sides of the bridge head steel box 2. After being hoisted into place, the anti-slip structures 5 abut against the base 9, reducing the risk of sliding between the anti-slip structures 5 and the base 9, improving stability, and thus improving the stability and safety of the bridge.

[0108] Further optimization scheme, the first filler 3 includes lightweight foam concrete, and the second filler 4 includes high-density filler. The first filler 3 includes lightweight concrete, which is filled in the corrugated arch box to support the hollow structure and improve the structural strength of the corrugated arch box; and because the corrugated arch box is across the river channel and has no supporting structure, the first filler 3 uses lightweight concrete, which can reduce the overall dead weight while ensuring the structural strength; and the arch foot chamber of the bridge head steel box 2 is filled with heavy high-density filler, and compacted to support the hollow structure of the bridge head steel box 2, improve the structural strength of the bridge head steel box 2, and can stably support the bridge; at the same time, the weight of the bridge head steel box 2 filled with high-density filler is greatly increased, which improves the stability as a bridge pier, and the increase in weight can greatly increase the friction between the anti-slip structure 5 and the base 9, effectively preventing sliding deviation.

[0109] In one embodiment of the present application, after the high-density filler is filled into the arch foot box chamber 10, cement slurry needs to be injected to fill the gaps to reduce the presence of voids and combine the high-density filler into a whole to improve stability.

[0110] Further optimizing the scheme, the base 9 includes graded crushed stone 6. The base 9 is built by stacking graded crushed stone 6 and hardened and bonded by concrete mortar, which serves as the foundation of bridge construction to form a horizontal installation surface, which can effectively prevent the sinking of the bridge during use and extend the service life of the bridge; at the same time, the top surface of the base 9 built by the graded crushed stone 6 and concrete is an uneven structure, which contacts with the anti-slip structure 5 and can form an interlocking to increase the horizontal thrust resistance. The improvement of the horizontal thrust resistance is specifically reflected in the value of the friction coefficient μ of the anti-slip structure 5 below, which needs to be determined according to the test.

[0111] To further optimize the scheme, side panels are provided on both sides of the corrugated arch rib 1, which are fixedly connected to the bridge head steel box 2, and the first filler 3 is filled in the space surrounded by the corrugated arch rib 1 and the side panels. Side panels are welded on both sides of the corrugated arch rib 1 to form a groove-shaped structure, which is convenient for carrying the first filler 3; the corrugated arch rib 1 and the side panels are both cut and bent on site, and then welded after arriving at the construction site, which is convenient for transportation and hoisting, and effectively reduces the transportation pressure of the corrugated arch box.

[0112] Further optimization scheme, a bridge deck 11 is laid between the two side plates, and the bridge deck 11 abuts against the top of the first filler 3; the bridge deck 11 extends to both sides and connects with the original road surface, and the bridge deck 11 is located at the top of the corrugated arch box and abuts against the top of the second filler 4. The bridge deck 11 is set at the top of the corrugated arch box, laid on the top of the first filler 3, forming a road surface convenient for walking and driving, and then the bridge deck 11 extends to both sides to the top of the bridge head steel box 2, and is laid to the top of the second filler 4; the bridge deck 11 extends to both sides of the bridge head steel box 2 and is connected to the original road surface, which is convenient for pedestrians and driving.

[0113] In one embodiment of the present application, the bridge deck 11 is made of concrete or asphalt alone, or a layered structure with concrete as the base and asphalt as the road surface, which can be selected according to specific usage requirements.

[0114] In one embodiment of the present application, a guardrail 12 may be designed on the bridge deck 11 to improve protection.

[0115] In a further optimized solution, a partition baffle 13 is provided between the arch foot box chamber 10 and the corrugated arch rib 1 to separate the first filler 3 and the second filler 4. The partition baffle 13 is used to separate the first filler 3 and the second filler 4 to prevent the second filler 4 from flowing into the corrugated arch box during filling.

[0116] The present invention also discloses a semi-assembled self-balancing arch bridge construction method based on corrugated steel, comprising the following steps:

[0117] Conduct on-site inspections of the site conditions in the area where the bridge is to be constructed and obtain the load requirements of the bridge;

[0118] The bridge dimensions are designed according to the site conditions and load requirements. The bridge dimensions include the thickness of the bridge box 7, the bridge height, the rise-span ratio, the length of the bridge head steel box 2 along the longitudinal direction of the bridge, and the dimensions of the bottom corrugated arch rib 1.

[0119] Among them, the bridge height is considered to be compatible with the old road sign height, and the arch rib thickness required to meet the bridge bearing capacity under the combined action of dead load and live load should be considered; the corrugated arch rib 1 of the corrugated arch box can withstand tensile stress and improve the bending resistance of the structure, but it is safe to use this part of the bearing capacity as a safety reserve.

[0120] The rise-to-span ratio takes into account the span of the bridge and the thrust at the arch foot.

[0121] The size of the bottom corrugated arch rib 1 is determined by considering the strength and stability under the construction load on the one hand, and the strength and stability of the corrugated arch rib 1 under the self-weight of the material after the construction of lightweight concrete on the other hand. The specific design and verification refer to the current "Code for Design of Steel Structures".

[0122] The thickness of the side wall of the bridge box 7 should take into account the lateral pressure after filling the material, and verify the strength and stability at the same time.

[0123] The strength and stability of the bridge box 7 under the construction load and the constant load of the filling material can be directly verified according to the current steel structure design specifications, but the self-balancing system needs to be regulated and protected separately: mainly involving the span ratio, the length of the bridge head steel box 2 along the longitudinal direction of the bridge, the bulk density γ of the filling material, and the friction coefficient μ of the anti-slip structure 5.

[0124] According to the attached Fig.12 It is known that the height of the bridge is related to the original road elevation and is a constant h; the width of the bridge is adapted to the width of the original road and is a constant b; the clear span of the bridge is related to the layout of the bridge site and is a constant d.

[0125] If the arrow-to-span ratio is selected as f1, the arrow height is:

[0126] x2=d·f1

[0127] The bulk density of lightweight concrete is γ1, and the corresponding volume of lightweight concrete under the span ratio f1 is V1.

[0128] In fact, the stress mode of the structural system described in the patent of this invention is similar to that of a two-hinged arch, and the corrugated steel at the lower edge of the arch rib can enable the arch rib to withstand bending moment. However, for conservative considerations, this part of the bearing capacity is used as a safety reserve, and the horizontal thrust is designed and calculated according to the three-hinged arch.

[0129] There is a horizontal thrust F at the arch foot x for:

[0130]

[0131] Among them, l is the distance from the starting point of the lightweight concrete range at the arch foot to the mid-span direction, and f(l) is the average height of the lightweight concrete at a certain distance from the starting point of the lightweight concrete range at the arch foot to the mid-span direction.

[0132] If the system is to achieve self-balance, the horizontal anti-slip force N d Should meet:

[0133] N d >α1F x

[0134] Among them, α1 is the magnification factor considering the live load effect.

[0135] If the bulk density of the high-density filler in the bridge head steel box 2 is γ2, then N can be calculated d :

[0136]

[0137] This patent stipulates that the value relationship between x1 and f1 is:

[0138]

[0139] Fabricate the bridgehead steel box 2 and the corrugated arch box in the inner field according to the designed dimensions, and transport the bridgehead steel box 2 and the corrugated arch box to the bridge construction area;

[0140] preparing a first filler 3 and a second filler 4 as filler materials according to the designed kind and quantity, and transporting the first filler 3 and the second filler 4 to the bridge construction area;

[0141] A foundation 9 is constructed on both sides of the river channel, and then the bridge head steel box 2 and the corrugated arch box are assembled into a bridge body box 7, and then the bridge body box 7 is erected on two foundations 9; first, the foundation at the bridge head position is replaced with graded crushed stone 6 to form a foundation 9 to ensure the stability of the foundation, the replacement thickness is not less than 1.5m, and the replacement range should be greater than 0.5m beyond the arch foot contact surface of the bridge head steel box 2; for the bridge environment with anti-scouring requirements, the surface of the graded crushed stone 6 should be protected by an anti-scouring structure, and the replaced graded crushed stone 6 is in contact with the arch foot anti-slip structure 55 to form an interlocking and increase the horizontal thrust resistance; then the bridge head steel box 2 is erected on the designed bridge position, wherein the bridge head steel box 2 is located on the foundation 9 composed of the replaced graded crushed stone 6;

[0142] The second filler 4 is then injected into the bridgehead steel box 2. After the second filler 4 solidifies to the design value, the first filler 3 is filled into the corrugated arch box and cured to the design strength. High-density filler is added to the bridgehead steel box 2, and cement slurry is injected to fill the gap. In order to prevent the cement slurry from flowing out of the bridgehead steel box 2, a partition baffle 13 can be placed at the connection position between the bridgehead steel box 2 and the corrugated arch box. After the filler cement slurry in the bridgehead steel box 2 is initially solidified, lightweight concrete can be injected into the box chamber of the corrugated arch box. After the lightweight concrete solidifies, the bridge deck 11 paving construction can be carried out.

[0143] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do 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 should not be understood as a limitation on the present invention.

[0144] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A semi-assembled self-balancing arch bridge based on corrugated steel, erected on a symmetrically arranged base (9), characterized in that: It comprises a bridge box (7) which is set in a hollow space between the two bases (9), and the bridge box (7) is filled with filling material; The bridge body box (7) comprises a bridge head steel box (2) located on the base (9), a corrugated arch box for crossing the river channel is arranged between the two bridge head steel boxes (2), and the filling material is filled between the bridge head steel box (2) and the corrugated arch box; The filling material comprises a first filler (3) and a second filler (4), the first filler (3) is filled in the corrugated arch box, and the second filler (4) is filled in the bridge head steel box (2); The corrugated arch box comprises a corrugated arch rib (1) connected between the two bridge head steel boxes (2), and the first filler (3) is filled and located above the corrugated arch rib (1).

2. The semi-assembled self-balancing arch bridge based on corrugated steel according to claim 1 is characterized in that: The bridge head steel box (2) is hollowly arranged to form an arch foot box chamber (10), and the second filler (4) is filled in the arch foot box chamber (10).

3. The semi-assembled self-balancing arch bridge based on corrugated steel according to claim 1 is characterized in that: The bottom end of the bridge head steel box (2) is provided with a plurality of anti-slip structures (5) arranged in an array, and the anti-slip structures (5) abut against the top surface of the base (9).

4. The semi-assembled self-balancing arch bridge based on corrugated steel according to claim 1 is characterized in that: The first filler (3) comprises lightweight foam concrete, and the second filler (4) comprises high-density filler.

5. The semi-assembled self-balancing arch bridge based on corrugated steel according to claim 1 is characterized in that: The base (9) comprises graded crushed stone (6).

6. The semi-assembled self-balancing arch bridge based on corrugated steel according to claim 1 is characterized in that: Side panels are provided on both sides of the corrugated arch rib (1), and the side panels are fixedly connected to the bridge head steel box (2). The first filler (3) is filled in the space enclosed by the corrugated arch rib (1) and the side panels.

7. The semi-assembled self-balancing arch bridge based on corrugated steel according to claim 6 is characterized in that: A bridge deck (11) is paved between the two side plates, and the bridge deck (11) abuts against the top of the first filler (3); the bridge deck (11) extends to both sides and is connected to the original road surface, and the bridge deck (11) is located at the top of the corrugated arch box and abuts against the top of the second filler (4).

8. The semi-assembled self-balancing arch bridge based on corrugated steel according to claim 2 is characterized in that: A partition baffle (13) is provided between the arch foot box chamber (10) and the corrugated arch rib (1) for separating the first filler (3) and the second filler (4).

9. A construction method for a semi-assembled self-balancing arch bridge based on corrugated steel, based on the semi-assembled self-balancing arch bridge based on corrugated steel according to any one of claims 1 to 8, characterized in that The following steps are involved: Conduct on-site inspections of the site conditions in the area where the bridge is to be constructed and obtain the load requirements of the bridge; Design the bridge size based on the site conditions and load requirements; Manufacturing the bridge head steel box (2) and the corrugated arch box in the inner field according to the designed dimensions, and transporting the bridge head steel box (2) and the corrugated arch box to the bridge construction area; preparing a first filler (3) and a second filler (4) as filler materials according to the designed type and quantity, and transporting the first filler (3) and the second filler (4) to a bridge construction area; A foundation (9) is constructed on both sides of the river channel, and then the bridge head steel box (2) and the corrugated arch box are assembled into a bridge body box (7), and then the bridge body box (7) is erected on two foundations (9); The second filler (4) is then injected into the bridge head steel box (2). After the second filler (4) solidifies to the designed value, the first filler (3) is filled into the corrugated arch box and cured to the designed strength.

10. The construction method of a semi-assembled self-balancing arch bridge based on corrugated steel according to claim 9, characterized in that: The design of the bridge dimensions includes the thickness of the bridge box (7), the bridge height, the span-rise ratio, the length of the bridge head steel box (2) along the longitudinal direction of the bridge, and the dimensions of the bottom corrugated arch rib (1).

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