A tunnel-to-tunnel arch bridge convenient for rapid construction and construction method thereof

Abstract

The present invention relates to the technical field of bridge engineering, and in particular to an inter-tunnel arch bridge that is convenient for rapid construction and a construction method thereof. The inter-tunnel arch bridge that is convenient for rapid construction described in the present application adopts components that can be disassembled into independent, easy-to-transport, and regular structures. When a construction access road cannot reach a bridge site, it is convenient to transport the inter-tunnel arch bridge from a tunnel with limited height and width to a lifting position, and there is no need to use a large-scale lifting device. The inter-tunnel arch bridge is suitable for canyon areas where it is difficult to build a construction access road. At the same time, the arch rib adopts a steel tube concrete structure and the bridge deck adopts a corrugated steel-concrete composite bridge deck. When pouring concrete, no additional formwork is required, which effectively reduces the cost of supporting formwork, improves construction efficiency, shortens the construction period, and utilizes the tunnel construction period to carry out rapid construction of the inter-tunnel bridge, so that the inter-tunnel bridge is not often a controlling project of the entire line. The inter-tunnel bridge construction is of great significance to the construction of inter-tunnel bridges in deep canyon areas.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge engineering, and in particular to an inter-tunnel arch bridge which is convenient for rapid construction and a construction method thereof. Background Art

[0002] In mountainous areas with deep canyons, the terrain on both sides is steep and rugged, and it is more economical to use a simply supported beam bridge structure. However, due to the steep terrain in deep canyons, it is difficult to build a construction access road, and materials and machinery and equipment cannot be transported to the bridge site, resulting in the inability to construct the pile foundation, piers and other lower structures of the simply supported beam. At the same time, it is difficult to find a site for prefabricated beams due to site restrictions. Therefore, the construction of a simply supported beam bridge in this environment has many difficulties and is difficult to implement.

[0003] At present, for small and medium span (span below 60m) tunnel bridges in deep canyons, single-span steel box simply supported beams are used. The steel box beams are transported to the tunnel entrance through tunnels opened on both sides and constructed by jacking. However, when the bridge width is greater than the tunnel width, the steel box beam needs to be manufactured and constructed by jacking in sections. The jacking construction itself is difficult and the construction period cannot be guaranteed. For bridges with a span of more than 60m, if steel box beams are still used, the beam height or plate wall thickness needs to be increased. If steel truss beam bridges are used, due to their high beam height, they need to be installed by jacking in layers in the height direction, and the construction difficulty will be further increased.

[0004] In the prior art, for tunnel bridges built in deep canyons with a span of 60-150m, conventional arch bridge structures are used both at home and abroad to ensure the structural spanning capacity. However, in deep canyon areas where construction access roads are difficult to build, the construction difficulty increases sharply, the construction period is seriously delayed, and the tunnel construction period itself is also long, making the tunnel bridge often become the controlling project of the entire line and affecting the completion and opening time of the entire line. Therefore, there is an urgent need for a deep canyon tunnel arch bridge and its construction plan that can facilitate construction and shorten the construction period. Summary of the invention

[0005] The purpose of the present invention is to overcome the above-mentioned shortcomings of the prior art, such as the difficulty in constructing tunnel bridges in deep canyons, long construction period, reliance on the penetration of tunnels on both sides to provide construction access roads, affecting the time limit for the penetration of the entire line, and high construction safety risks, and to provide a tunnel arch bridge that is easy to construct quickly and a construction method thereof.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] A tunnel arch bridge which is easy to construct quickly comprises a main arch, a cross brace, a steel beam, a hanger and a bridge deck, wherein the cross brace is connected between the arch ribs of the main arch, the arch ribs comprise steel pipes filled with concrete, the cross brace and the steel beams are arranged along the transverse direction of the bridge, one end of the hanger is connected to the arch ribs and the other end is connected to the steel beams, each of the two ends of the steel beams is respectively connected to a corresponding hanger, and the bridge deck comprises a corrugated steel plate and concrete, and the corrugated steel plate is connected to the steel beams.

[0008] The arch bridge is of bottom-support type or middle-support type.

[0009] The tunnel arch bridge of the present invention is easy to construct quickly. The cross brace, steel beam, hanger and steel pipe are all linear regular components. The steel pipe can include several segments. The corrugated steel plate is a plate-shaped component, that is, each part of the arch bridge can be disassembled into independent, easy-to-transport, regular-structured components, which are easy to transport from a tunnel with limited height and width to a lifting position, and there is no need to use a large lifting device. It is suitable for canyon areas where it is difficult to build construction access roads. The bridge deck is composed of a steel beam and a corrugated steel-concrete composite bridge deck thereon, which can effectively To ensure the integrity of the bridge deck, since the corrugated steel plate is a continuous component that can also serve as a longitudinal beam, the problem that the lattice beam cannot be transported through the tunnel is avoided. At the same time, the arch rib adopts a steel tube concrete structure and the bridge deck adopts a corrugated steel-concrete composite bridge deck. When pouring concrete, no additional formwork is required, which avoids the transportation of formwork, effectively reduces the formwork cost, improves construction efficiency, shortens the construction period, and uses the tunnel construction period to quickly construct the inter-tunnel bridge, avoiding the inter-tunnel bridge often becoming the controlling project of the entire line. It is of great significance to the construction of inter-tunnel bridges in deep canyon areas.

[0010] Preferably, the corrugated extension direction of the corrugated steel plate is arranged along the transverse bridge direction.

[0011] Further preferably, the bridge deck further comprises end sealing plates, both ends of the corrugated steel plate are welded to the end sealing plates, and the end sealing plates are welded to the top surface of the steel beam.

[0012] Preferably, shear keys or perforated steel plates or transverse steel bars are welded and connected to the corrugated steel plates.

[0013] Preferably, the steel crossbeam is an I-beam, and the hanger rod is an epoxy-sprayed steel strand.

[0014] Preferably, the arch rib is a single circular steel tube concrete structure or a dumbbell-shaped steel tube concrete structure.

[0015] A method for constructing an inter-tunnel arch bridge that is easy to construct quickly, comprising the following steps:

[0016] a. Process cross braces, steel beams, hangers, steel pipes and corrugated steel plates, and construct rock anchors above the bridge site;

[0017] b. After the tunnel is penetrated, the arch seat is constructed, and cables and buckles are installed on the rock anchors on both sides to form a cable hoisting system;

[0018] c. The steel pipes are lifted symmetrically from the tunnel openings on both sides to the installation positions in sequence by the cable lifting system for positioning and connection until the arch ribs are closed, and then the cross brace is installed between the two arch ribs, and concrete is poured into the steel pipes;

[0019] d. Using the cable hoisting system, the suspension rods are symmetrically lifted from the tunnel openings on both sides to the installation positions in sequence, and the upper ends of the corresponding suspension rods are connected to the corresponding arch ribs;

[0020] e. Using the cable hoisting system, the steel beams are hoisted symmetrically from the tunnel openings on both sides to the installation positions in sequence, and the two ends of the corresponding steel beams are connected to the corresponding hoisting rods respectively;

[0021] f. The corrugated steel plates are symmetrically lifted from the tunnel openings on both sides to the installation positions in sequence by the cable lifting system, the corrugated steel plates are connected to the corresponding steel beams, the bridge deck reinforcements are tied, and the corrugated steel plates are used as templates to cast bridge deck concrete;

[0022] g. Install the bridge deck auxiliary structure and complete the construction of the inter-tunnel arch bridge.

[0023] The invention adopts a construction method for an inter-tunnel arch bridge that is easy to construct quickly. Before the tunnel is penetrated, rock anchors are constructed and various structural members of the arch bridge are processed. The arch rib adopts a steel tube concrete structure. After each segment is assembled and closed in turn, concrete is poured into the tube without installing a concrete formwork. The bridge deck adopts a corrugated steel-concrete composite bridge deck, and the corrugated steel plate can be used as a formwork for the bridge deck concrete, and no additional formwork is required, which effectively reduces the construction difficulty and safety risks. After the tunnel is penetrated, a cable lifting system is installed, and the prefabricated components are transported to the entrance of the tunnel through the tunnel for lifting, which is convenient for rapid transportation to the site. The method adopts fully assembled prefabricated components for installation, without the need for additional formwork, effectively saving costs, shortening construction period, reducing construction difficulty and safety risks, reducing the site restriction effect of the special terrain of deep canyons, effectively ensuring the spanning capacity of large-span bridges, having good economy, meeting the requirements for rapid construction of inter-tunnel bridges, and fully solving the difficulty in building construction access roads for inter-tunnel bridges in deep canyons, thereby solving the problem of short construction time available for inter-tunnel bridges.

[0024] Preferably, step a is carried out simultaneously with tunnel construction.

[0025] In summary, compared with the prior art, the present invention has the following beneficial effects:

[0026] 1. The inter-tunnel arch bridge of the present invention, which is convenient for rapid construction, is constructed by disassembling independent components that are convenient for transportation and have regular structures. It is convenient to transport the inter-tunnel arch bridge from a tunnel with limited height and width to a lifting position, and there is no need to use a large-scale lifting device. The inter-tunnel arch bridge is suitable for canyon areas where it is difficult to build construction access roads. At the same time, the arch rib adopts a steel tube concrete structure and the bridge deck adopts a corrugated steel-concrete composite bridge deck. When pouring concrete, no additional formwork is required, which avoids the transportation of formwork, effectively reduces the cost of formwork, improves construction efficiency, shortens the construction period, and utilizes the tunnel construction period to carry out rapid construction of the inter-tunnel bridge, so that the inter-tunnel bridge does not often become a controlling project of the entire line. This is of great significance to the construction of inter-tunnel bridges in deep canyon areas.

[0027] 2. The construction method of the inter-tunnel arch bridge which is convenient for rapid construction as described in the present invention is adopted, and fully assembled prefabricated parts are used for installation, without the need for additional formwork, which effectively saves costs, shortens the construction period, reduces the construction difficulty and safety risks, reduces the site restriction impact of the special terrain of deep canyons, effectively ensures the spanning capacity of large-span bridges, has good economy, meets the requirements of rapid construction of inter-tunnel bridges, and fully solves the difficulty in constructing construction access roads for inter-tunnel bridges in deep canyons, thereby solving the problem of short time available for construction of inter-tunnel bridges. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a structural elevation view of a tunnel arch bridge that is easy to construct quickly according to the present invention;

[0029] Figure 2 for Figure 1 Cross-sectional view of

[0030] Figure 3 A bridge deck layout diagram of the inter-tunnel arch bridge of the present invention;

[0031] Figure 4 It is a structural schematic diagram of the bridge deck of the inter-tunnel arch bridge according to the present invention;

[0032] Figure 5 It is a schematic diagram of the hoisting process of the cable hoisting system described in the present invention.

[0033] Markings in the figure: 1-cross brace, 2-steel cross beam, 3-hanger, 4-bridge deck, 5-steel pipe, 6-corrugated steel plate, 7-arch seat, 8-shear key. DETAILED DESCRIPTION

[0034] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. However, this should not be understood as the scope of the above subject matter of the present invention being limited to the following embodiments, and all technologies realized based on the content of the present invention belong to the scope of the present invention.

[0035] Example 1

[0036] like Figure 1-4 As shown, the present invention discloses an inter-tunnel arch bridge which is easy to construct quickly. The arch bridge is of bottom-supported type or middle-supported type. The present embodiment diagram only shows the bottom-supported type, comprising a main arch, a cross brace 1, a steel cross beam 2, a hanger 3 and a bridge deck 4. The cross brace 1 is connected between the arch ribs of the main arch. For example, the steel cross beam 2 is an I-beam, and the hanger 3 is an epoxy-sprayed steel strand, i.e., a flexible hanger, which is suitable for use in canyon terrain with large wind loads. The arch rib comprises a steel pipe 5, which is filled with concrete. The arch rib is a single circular steel tube concrete structure or a dumbbell-shaped steel tube concrete structure. The cross brace 1 and the steel cross beam 2 are both arranged along the transverse direction of the bridge. One end of the hanger 3 is connected to the arch rib, and the other end is connected to the steel beam 2, that is, the upper end of the hanger 3 is anchored on the upper edge of the main arch, and the lower end is anchored on the steel beam 2, and each of the two ends of the steel beam 2 is respectively connected to a hanger 3, and the bridge deck 4 includes an end sealing plate, a corrugated steel plate 6 and concrete, and the two ends of the corrugated steel plate 6 are welded to the end sealing plate, and the end sealing plate is welded to the top surface of the steel beam 2. The corrugated steel plate 6 is welded to a shear key 8 or a perforated steel plate or a transverse steel bar. This embodiment only illustrates the connection of the shear key 8, and the corrugated extension direction of the corrugated steel plate 6 is arranged along the transverse direction of the bridge.

[0037] The tunnel-to-tunnel arch bridge of the present invention is convenient for rapid construction. The cross brace 1, steel cross beam 2, hanger 3 and steel pipe 5 are all linear components. The steel pipe 5 may include a plurality of segments. The corrugated steel plate 6 is a plate-like component, that is, each part constituting the arch bridge can be disassembled into independent components that are easy to transport and have regular structures. It is convenient to transport it from a tunnel with limited height and width to a lifting position, and there is no need to use a large-scale lifting device. It is suitable for canyon areas where it is difficult to build construction access roads. At the same time, the arch rib adopts a steel tube concrete structure and the bridge deck adopts a corrugated steel-concrete composite bridge deck. When pouring concrete, there is no need to set up additional formwork, which avoids the transportation of formwork, effectively reduces the cost of formwork, improves construction efficiency, shortens the construction period, and does not need to build a construction access road, so that tunnel-to-tunnel bridges often become the controlling projects of the entire line. It is of great significance to the construction of tunnel-to-tunnel bridges in deep canyon areas.

[0038] Example 2

[0039] The method for constructing a tunnel-to-tunnel arch bridge that is easy to construct quickly described in the present invention comprises the following steps:

[0040] a. Process the cross brace 1, steel beam 2, hanger 3, steel pipe 5 and corrugated steel plate 6, and construct rock anchors above the bridge site;

[0041] b. After the tunnel is through, the arch seat 7 is constructed, and cables and buckles are installed on the rock anchors on both sides to form a cable hoisting system;

[0042] c. The steel pipes 5 are lifted symmetrically from the tunnel openings on both sides to the installation positions in sequence by the cable lifting system for positioning and connection until the arch ribs are closed, and then the cross brace 1 is installed between the two arch ribs, and concrete is poured into the steel pipes 5;

[0043] d. The suspension rods 3 are symmetrically lifted from the tunnel openings on both sides to the installation positions in sequence by the cable lifting system, and the upper ends of the corresponding suspension rods 3 are connected to the corresponding arch ribs;

[0044] e. The steel beams 2 are lifted symmetrically from the tunnel openings on both sides to the installation positions in sequence by the cable lifting system, and the two ends of the corresponding steel beams 2 are connected to the corresponding suspension rods 3 respectively;

[0045] f. The corrugated steel plates 6 are symmetrically lifted from the tunnel openings on both sides to the installation positions in sequence by the cable lifting system, the corrugated steel plates 6 are connected to the corresponding steel beams 2, the bridge deck reinforcements are tied, and the corrugated steel plates 6 are used as templates to cast the bridge deck concrete;

[0046] g. Install the bridge deck auxiliary structure and complete the construction of the inter-tunnel arch bridge.

[0047] Specifically, first during the tunnel construction, rock anchor construction and processing of various structural components of the arch bridge are carried out simultaneously, including cross braces 1, steel beams 2, hangers 3, arch rib steel pipes 5, and corrugated steel plates 6. Shear keys 8 are welded and connected to the corrugated steel plates 6. The above-mentioned work is carried out simultaneously with the tunnel excavation.

[0048] After the tunnel is penetrated, the arch seat (bridge abutment) foundation pit is excavated simultaneously, the arch seat reinforcement is tied and the embedded arch foot section is installed, and then the arch seat concrete is poured to complete the construction of the arch seat 7, and cables and buckles are installed on the rock anchors on both sides to form a cable lifting system, and then the steel pipe 5 is transported through the tunnels on both sides to the corresponding tunnel entrances for lifting and use, and other prefabricated components can be transported to the place before lifting.

[0049] Then the main construction of the arch bridge is carried out. Figure 5As shown, the steel pipes 5 are symmetrically lifted from the tunnel openings on both sides to the installation positions by the cable lifting system, and the steel pipes 5 on both sides are lifted to the installation positions in sections for positioning and connection until the arch ribs are connected, and then the cross brace 1 is installed between the two arch ribs, and then concrete is poured into the steel pipes 5. After reaching the required strength, the hanger 3 can be installed.

[0050] The suspension rods 3 are hoisted by the cable hoisting system, and are hoisted symmetrically from the tunnel openings on both sides to the installation positions in turn, and then the upper end of each suspension rod 3 is connected to the corresponding arch rib to complete the installation of all the suspension rods 3.

[0051] The steel beams 2 are lifted symmetrically from the tunnel openings on both sides to the installation positions in turn by the cable lifting system, and the two ends of the corresponding steel beams 2 are connected to the lower ends of the corresponding suspension rods 3 respectively.

[0052] End sealing plates are welded to both ends of the corrugated steel plate 6, and the corrugated extension direction of the corrugated steel plate 6 is arranged along the transverse direction of the bridge. Then, the corrugated steel plate 6 is lifted from the tunnel openings on both sides to the installation position in turn through the cable lifting system, and the lifting is also symmetrical. The end sealing plates at both ends of the corrugated steel plate 6 are correspondingly welded to the top surface of the steel cross beam 2, and then the bridge deck steel bars are tied. The corrugated steel plate 6 and the end sealing plates are used as templates to cast the bridge deck concrete without the need to install additional templates.

[0053] After the main construction of the main bridge is completed, the construction of auxiliary structures such as asphalt paving and bridge deck guardrails will be carried out to complete the construction of the inter-tunnel arch bridge.

[0054] This method uses fully assembled prefabricated parts for installation, without the need for additional formwork, effectively saving costs, shortening construction period, reducing construction difficulty and safety risks, and reducing the impact of site restrictions on special terrain in deep canyons. It effectively ensures the spanning capacity of large-span bridges and has good economy. It meets the requirements for rapid construction of tunnel bridges and fully solves the difficulty in constructing construction access roads for tunnel bridges in deep canyons, thereby bringing about the problem of short time available for construction of tunnel bridges.

[0055] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An inter-tunnel arch bridge that is easy to construct quickly, characterized in that: The invention comprises a main arch, a cross brace (1), a steel cross beam (2), a hanger (3) and a bridge deck (4), wherein the cross brace (1) is connected between the arch ribs of the main arch, the arch ribs comprise steel pipes (5), the steel pipes (5) are filled with concrete, the cross brace (1) and the steel cross beam (2) are arranged along the transverse direction of the bridge, one end of the hanger (3) is connected to the arch ribs, and the other end is connected to the steel cross beam (2), and each of the two ends of the steel cross beam (2) is respectively connected to a corresponding hanger (3), the bridge deck (4) comprises a corrugated steel plate (6) and concrete, the corrugated steel plate (6) is connected to the steel cross beam (2), the bridge deck is composed of the steel cross beam (2) and the corrugated steel-concrete composite bridge deck thereon, and the corrugated steel plate (4) is a continuous component that can also serve as a longitudinal beam.

2. The tunnel arch bridge according to claim 1, characterized in that: The wavy extension direction of the wavy steel plate (6) is arranged along the transverse bridge direction.

3. The tunnel arch bridge according to claim 2, characterized in that: The bridge deck (4) further comprises an end sealing plate, both ends of the corrugated steel plate (6) are welded to the end sealing plate, and the end sealing plate is welded to the top surface of the steel cross beam (2).

4. The tunnel arch bridge according to any one of claims 1 to 3, characterized in that: The corrugated steel plate (6) is welded and connected to a shear key (8) or a perforated steel plate or a transverse steel bar.

5. The tunnel arch bridge according to any one of claims 1 to 3, characterized in that: The steel cross beam (2) is an I-beam, and the suspension rod (3) is an epoxy-sprayed steel strand.

6. The tunnel arch bridge according to any one of claims 1 to 3, characterized in that: The arch rib is a single circular steel tube concrete structure or a dumbbell-shaped steel tube concrete structure.

7. A construction method for an inter-tunnel arch bridge that is convenient for rapid construction, characterized in that: The construction of an inter-tunnel arch bridge that is easy to construct quickly as described in any one of claims 1 to 6 comprises the following steps: a. Processing the cross brace (1), steel cross beam (2), hanger (3), steel pipe (5) and corrugated steel plate (6), and constructing the rock anchor above the bridge site; b. After the tunnel is penetrated, the arch seat (7) is constructed, and cables and buckles are installed on the rock anchors on both sides to form a cable hoisting system; c. The steel pipes (5) are symmetrically lifted from the tunnel openings on both sides of the river to the installation positions in sequence by the cable lifting system for positioning and connection until the arch ribs are connected, and then the cross brace (1) is installed between the two arch ribs, and concrete is poured into the steel pipes (5); d. symmetrically lifting the suspension rods (3) from the tunnel openings on both sides to the installation positions in sequence through the cable lifting system, and connecting the upper ends of the corresponding suspension rods (3) to the corresponding arch ribs; e. symmetrically lifting the steel beams (2) from the tunnel openings on both sides to the installation positions in sequence through the cable lifting system, and connecting the two ends of the corresponding steel beams (2) to the corresponding suspension rods (3); f. The corrugated steel plates (6) are symmetrically lifted from the tunnel openings on both sides to the installation positions in sequence by the cable lifting system, the corrugated steel plates (6) are connected to the corresponding steel beams (2), the bridge deck reinforcements are tied, and the corrugated steel plates (6) are used as templates to cast bridge deck concrete; g. Install the bridge deck auxiliary structure and complete the construction of the inter-tunnel arch bridge.

8. The method according to claim 7, characterized in that The step a is carried out synchronously with the tunnel construction.

Images