A beam-arch composite structure and construction method thereof

Abstract

The present invention relates to the field of bridge engineering technology, and specifically to a beam-arch composite structure and a construction method thereof, comprising a beam bottom plate and a beam top plate spaced apart on the upper portion of the beam bottom plate; a beam web plate, wherein the beam web plates are provided in a plurality and spaced apart arrangement, the top of each beam web plate being fixedly connected to the beam top plate, and the bottom of each beam web plate being fixedly connected to the beam bottom plate; an arch bottom plate, which is fixedly provided in the middle of the beam top plate, and a motor vehicle lane for motor vehicles is reserved on the beam top plate on at least one side of the arch bottom plate; an arch top plate, which is spaced apart on the upper portion of the arch bottom plate; an arch slat plate, which is provided in a plurality and spaced apart arrangement, the top of each arch slat plate being fixedly connected to the arch top plate, and the bottom of each arch slat plate being fixedly connected to the arch bottom plate; and a sidewalk being reserved on the upper portion of the arch top plate. The beam-arch composite structure of the present invention reduces the building height of the original beam portion while meeting the structural stiffness requirements of the bridge.

Description

Technical Field

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

[0002] The box girder structure has certain advantages in bridge construction due to its visual simplicity and high bending and torsional stiffness. Therefore, box girder bridges are widely used in the construction of highway bridges, municipal bridges and railway bridges. Cast-in-place continuous box girders can better adapt to line shapes and can realize variable-width bridges, oblique-curved bridges and ramp bridges with small curve radii. Therefore, they are more widely used in bridge projects, especially urban bridges.

[0003] Arch bridge is an ancient bridge type and is also a bridge type frequently used in modern bridge construction. Arch bridges mainly bear vertical loads during use. Under this working condition, vertical reaction forces and horizontal thrusts will be generated at the supports at both ends of the arch bridge. The generation of horizontal thrust will generate axial pressure in the arch bridge and reduce the mid-span bending moment, so that the strength of the main arch section material of the arch bridge can be fully utilized and the spanning capacity can be increased. Therefore, arch bridges are widely used in bridge engineering construction, especially landscape bridges.

[0004] Among existing box girder construction technologies, cast-in-situ box girder structures still suffer from various shortcomings, limitations, and deficiencies. Both cast-in-situ reinforced concrete box girders and prestressed reinforced concrete box girders have significant deadweight, with 60% to 80% of their load-bearing capacity used to support their own dead loads. Therefore, to meet the bending load requirements of bridges, certain design requirements apply to the box girder cross-section. For example, the cross-section height of a continuous box girder with a uniform cross-section is typically 1 / 15 to 1 / 18 of the span. However, in bridge engineering design, particularly in urban bridge design, the height of the superstructure is often restricted, making conventional cast-in-situ concrete box girders incapable of meeting the design requirements. To address this technical issue, existing technologies generally utilize steel box girder structures instead of concrete box girders. While steel box girder structures offer superior structural strength, the cross-section height of a continuous box girder with a uniform cross-section is typically 1 / 15 to 1 / 18 of the span, which can lead to insufficient structural rigidity due to the reduced cross-section height.

[0005] Therefore, there is a need for a beam-arch structure that can meet both the stiffness requirements of the bridge structure and the design requirements of the building height of the bridge superstructure. Summary of the Invention

[0006] In order to solve the above problems, the purpose of the present invention is to provide a beam-arch composite structure that can meet both the stiffness requirements of the bridge structure and the design requirements of the building height of the bridge superstructure; another purpose of the present invention is to provide a construction method for the beam-arch composite structure.

[0007] The present invention provides a technical solution for a beam-arch composite structure, comprising:

[0008] beam bottom plate;

[0009] A beam top plate, spaced apart and arranged above the beam bottom plate;

[0010] A beam web, wherein the beam webs are provided in plurality and arranged at intervals, the top of each beam web is fixedly connected to the beam top plate, and the bottom of each beam web is fixedly connected to the beam bottom plate;

[0011] An arch bottom plate is fixedly arranged on the middle part of the beam top plate, and a motor vehicle lane for motor vehicles is reserved on the beam top plate on at least one side of the arch bottom plate;

[0012] Arch top plates are arranged at intervals on the upper part of the arch bottom plates;

[0013] A plurality of soffit plates are provided and arranged at intervals, the top of each soffit plate is fixedly connected to the top plate, and the bottom of each soffit plate is fixedly connected to the bottom plate;

[0014] A sidewalk is reserved on the upper portion of the arch slab.

[0015] As a preferred solution, the beam web includes a plurality of beam middle webs arranged in the middle of the upper portion of the beam bottom plate and beam side webs arranged on both sides of the upper portion of the beam bottom plate, the lower ends of the beam middle webs and the lower ends of the beam side webs are fixedly connected to the beam bottom plate, and the top ends of the beam middle webs and the top ends of the beam side webs are fixedly connected to the beam top plate;

[0016] The soffit plate includes a plurality of middle webs arranged in the middle of the upper portion of the base plate and side webs arranged on both sides of the upper portion of the base plate. The lower ends of the middle webs and the side webs are fixedly connected to the base plate, and the top ends of the middle webs and the side webs are fixedly connected to the top plate.

[0017] As a preferred solution, each of the beam side webs can be arranged vertically or tilted in the middle, and each of the beam middle webs is arranged vertically;

[0018] Each of the arch side webs can be arranged vertically or inclined, and each of the arch middle webs is arranged vertically.

[0019] As a preferred solution, the beam side webs and the beam middle webs can both be flat plates or curved plates in the longitudinal direction of the beam-arch composite structure; the arch side webs and the arch middle webs can both be flat plates or curved plates in the longitudinal direction of the beam-arch composite structure.

[0020] As a preferred solution, the beam side webs and the beam middle webs are reinforced concrete slabs or steel plates; the arch side webs and the arch middle webs are reinforced concrete slabs or steel plates.

[0021] As a preferred solution, upwardly extending anti-collision guardrails are fixedly installed on the beam side web and the arch side web.

[0022] As a preferred solution, an inspection path is reserved between the arch side web and the beam top plate.

[0023] A construction method for the above-mentioned beam-arch composite structure comprises the following steps:

[0024] S1, construction of pile foundations, caps, piers, abutments and other substructures at the project site;

[0025] S2, install bridge bearings and related embedded parts;

[0026] S3, fix and install the beam bottom plate, beam web plate, beam top plate, arch bottom plate, arch web plate and arch top plate in sequence from bottom to top;

[0027] S4, construction of bridge deck pavement and ancillary works.

[0028] As a preferred solution, the beam bottom plate, beam web plate, beam top plate, arch bottom plate, arch soffit plate and arch top plate are all reinforced concrete plates, and the beam bottom plate, beam web plate, beam top plate, arch bottom plate, arch soffit plate and arch top plate all include steel mesh and concrete poured on the steel mesh;

[0029] The step S1 also includes: strengthening the support foundation, setting up the full-height support, pre-pressing the support, and adjusting the support elevation;

[0030] The step S3 further comprises:

[0031] S301, install the bottom formwork and side formwork of the beam;

[0032] S302, tying the steel mesh of the beam bottom plate and the steel mesh of the beam web;

[0033] S303, installation of corrugated pipes and longitudinal prestressed steel tendons;

[0034] S304, installing the beam inner formwork;

[0035] S305, tie the beam top plate steel bars and arch bottom plate steel bars, and pre-embed the arch web plate steel bars;

[0036] S306, pour beam concrete into the steel grid of the beam bottom plate, the steel grid of the beam web plate, the steel grid of the beam top plate, the steel grid of the arch bottom plate and the steel grid of the arch web plate.

[0037] S307, after initial setting of concrete, install the soffit slab side formwork and inner membrane;

[0038] S308, pouring arch concrete onto the side form and inner membrane of the arch soffit plate;

[0039] S309, concrete curing;

[0040] S310, after the concrete age is greater than 7 days and the concrete strength and elastic modulus reach 85% of the design value, the formwork is removed and various prestressing methods are carried out;

[0041] S311, grouting and anchor sealing;

[0042] S312, remove the full-hall support.

[0043] As a preferred solution, the beam bottom plate, beam web plate, beam top plate, arch bottom plate, arch web plate and arch top plate are all steel plates;

[0044] The step S1 further includes: setting up temporary buttresses;

[0045] The step S3 further comprises:

[0046] S31, hoist the upper beam-arch composite structure on site in sections and pieces;

[0047] S32, welding the beam-arch composite structure into a whole;

[0048] S33, remove temporary piers.

[0049] Compared with the prior art, the beneficial effects of this application are:

[0050] The beam-arch superimposed structure of the present application includes a beam bottom plate, a beam web plate, a beam top plate, an arch bottom plate, an arch web plate and an arch top plate, which are arranged in sequence from bottom to top. There are multiple beam web plates and they are arranged at intervals. The top of each beam web plate is fixedly connected to the beam top plate, and the bottom of each beam web plate is fixedly connected to the beam top plate; the arch bottom plate is fixedly arranged in the middle of the beam top plate, and a motor vehicle lane for motor vehicles is reserved on the beam top plate on at least one side of the arch bottom plate; there are multiple arch web plates and they are arranged at intervals. The top of each arch web plate is fixedly connected to the arch top plate, and the bottom of each arch web plate is fixedly connected to the arch top plate; a sidewalk is reserved on the upper part of the arch top plate.

[0051] The beam-arch superimposed structure of the present application fixes and integrates the beam top plate and the arch bottom plate of the connected part of the beam and arch (i.e., shares them), and the arch web plate becomes higher to form the arch ring facade. Because the beam and arch are superimposed and connected as one, the beam and arch can participate in the force together, which not only reduces the building height of the original beam part, but also solves the problem of horizontal force generated at both ends of the arch, and meets the stiffness requirements of the bridge structure.

[0052] The beam-arch composite structure of the present invention retains the external features of the beam and the arch, and can meet the requirements of bridge structural stiffness and the design requirements of the bridge superstructure building height. At the same time, the beam-arch composite structure bridge can be used for vehicles on the beam top plate and for pedestrians on the arch top plate according to actual needs, thereby realizing the separation of vehicles and people, and can make the structure widely used in landscape bridge design. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] Figure 1 It is a structural schematic diagram of the beam-arch composite structure of the present invention.

[0054] Among them, 1. Beam bottom plate, 2. Beam top plate, 3. Beam middle web, 4. Beam side web, 5. Arch bottom plate, 6. Arch top plate, 7. Arch middle web, 8. Arch side web, 9. Anti-collision guardrail, 10. Maintenance road. DETAILED DESCRIPTION

[0055] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0056] A preferred embodiment of a beam-arch composite structure of the present invention is as follows: Figure 1 As shown, it includes a beam bottom plate 1, a beam web plate, a beam top plate 2, an arch bottom plate 5, an arch web plate and an arch top plate 6 arranged in sequence from bottom to top, the beam top plate 2 is arranged at intervals on the upper part of the beam bottom plate 1, there are multiple beam web plates and they are arranged horizontally at intervals, the beam web plates are arranged between the beam bottom plate 1 and the beam top plate 2, the top of each beam web plate is fixedly connected to the beam top plate 2, and the bottom of each beam web plate is fixedly connected to the beam bottom plate 1; the arch bottom plate 5 is fixedly arranged in the middle of the beam top plate 2, and a motor vehicle lane for motor vehicles is reserved on the beam top plate 2 on at least one side of the arch bottom plate 5; the arch top plate 6 is arranged at intervals on the upper part of the arch bottom plate 5, there are multiple arch web plates and they are arranged horizontally at intervals, the top of each arch web plate is fixedly connected to the arch top plate 6, and the bottom of each arch web plate is fixedly connected to the arch bottom plate 5; a sidewalk is reserved on the upper part of the arch top plate 6.

[0057] The beam-arch superimposed structure of the present application fixes the beam top plate 2 and the arch bottom plate 5 of the beam-arch connected part into one, and the arch web plate becomes higher to form the arch ring facade. Because the beam-arch is superimposed and connected into one, the beam and the arch can participate in the force together, which reduces the building height of the original beam part and also solves the problem of generating horizontal force at both ends.

[0058] Specifically, in a specific embodiment of the present application, the beam top plate 2 and the arch bottom plate 5 can be provided integrally, so as to connect the beam structure and the arch structure to achieve force transmission and realize simultaneous force bearing.

[0059] The beam webs specifically include a plurality of mid-beam webs 3 disposed in the upper middle portion of the beam bottom plate 1 and side webs 4 disposed on both sides of the upper portion of the beam bottom plate 1. The lower ends of the mid-beam webs 3 and the lower ends of the side webs 4 are fixedly connected to the beam bottom plate 1, while the top ends of the mid-beam webs 3 and the top ends of the side webs 4 are fixedly connected to the beam top plate 2. The side webs 4 and mid-beam webs 3 are used to support and connect the beam bottom plate 1 and the beam top plate 2. The requirements for variable-width box girder bridges can be met by setting the longitudinal spacing between the side webs 4 and mid-beam webs 3, as well as the spacing between adjacent mid-beam webs 3, i.e., the spacing between the individual box cells.

[0060] The soffit plate includes a plurality of mid-arch webs 7 arranged in the middle of the upper part of the arch base plate 5 and side webs 8 arranged on both sides of the upper part of the arch base plate 5. The lower ends of the mid-arch webs 7 and the lower ends of the side webs 8 are fixedly connected to the arch base plate 5, and the top ends of the mid-arch webs 7 and the top ends of the side webs 8 are fixedly connected to the arch top plate 6. The side webs 8 and the mid-arch webs 7 are used to support and connect the arch base plate 5 and the arch top plate 6.

[0061] Specifically, each beam side web 4 can be arranged vertically or inclined toward the middle of the beam bottom plate 1, and each beam middle web 3 is arranged vertically, so that the beam structure forms a stable stress form as needed; each arch side web 8 can be arranged vertically or inclined toward the middle of the arch bottom plate 5, and each arch middle web 7 is arranged vertically so that the arch structure forms a stable stress form as needed.

[0062] Furthermore, the beam side webs 4 and the beam middle webs 3 can both be flat plates or curved plates; the arch side webs 8 and the arch middle webs 7 can both be flat plates or curved plates.

[0063] In a specific embodiment of the present application, the top and bottom beam plates 2 and 1 are arranged horizontally. The side beam webs 4 can be perpendicular to the top and bottom beam plates 2 and 1, or can be connected at an angle and cross-connected to the top and bottom beam plates 2 and 1, or can be designed in an arc shape. The side beam webs 4 and the middle beam webs 3 can be designed as straight lines or curves in the longitudinal direction to meet the requirements of curved bridges with a certain curvature radius. The side arch webs 8 can be perpendicular to the top and bottom arch plates 6 and 5, or can be connected at an angle and cross-connected to the top and bottom arch plates 5, or can be designed in an arc shape.

[0064] Specifically, in the specific embodiments of the present application, the heights of the beam side webs 4 and the beam middle webs 3 and the number of the beam middle webs 3 can be determined according to the actual driving conditions and force requirements; the needs of the variable width box girder bridge can be met by setting the transverse spacing between the beam side webs 4 and the beam middle webs 3 in the longitudinal direction, and setting the spacing between two adjacent beam middle webs 3, that is, setting the spacing between each box chamber formed by the beam bottom plate 1 and the beam webs.

[0065] Furthermore, in a specific embodiment of the present application, the heights of the side arch webs 8 and the mid-arch webs 7 as well as the number of the mid-arch webs 7 can be determined according to actual pedestrian conditions and force requirements.

[0066] In other embodiments of the present application, the arch side webs 8 and the arch center webs 7 have varying heights along the longitudinal direction to achieve the shape of the arch in the beam-arch composite structure and achieve stable load bearing. The arch side webs 8 of the arch structure can extend longitudinally along a circular curve, parabola, or catenary, or can extend upward along a broken line or curved line.

[0067] When the beam-arch composite structure of the present application is used for multi-span simply supported beams or continuous beams, the expansion and contraction amount can be calculated according to the span length or joint length, and a bridge deck continuous or expansion joint can be set at the corresponding pier top according to the expansion and contraction amount.

[0068] When the beam-arch composite structure of the present application is used for a multi-span concrete continuous beam bridge, negative bending moment steel strands may be provided at corresponding positions of the beam-arch composite structure above the continuous piers to resist the negative bending moment on the pier tops.

[0069] The side webs 4 and center webs 3 are reinforced concrete slabs or steel plates; the side webs 8 and center webs 7 are reinforced concrete slabs or steel plates. In a specific embodiment, the side webs 4 and center webs 3 are solid-web or hollow-web truss structures; the side webs 8 and center webs 7 can be either solid-web or hollow-web truss structures.

[0070] Among them, upward extending anti-collision guardrails 9 are fixedly installed on the beam web and the arch side web 8; and an inspection path 10 is also reserved between the arch side web 8 and the beam top plate 2.

[0071] The beam-arch composite structure of the present invention has the following advantages: because the beams and arches are cast together and bear the load together, the bearing capacity can be greatly improved compared with beam structures with the same span and the same beam height, and the effect is particularly obvious for simply supported beams and continuous beams with small and medium spans; compared with conventional ordinary concrete beams with the same span, the beam height can be effectively reduced, so that it can be better applied to projects with limited structural height; because the load-bearing system of the beam-arch composite structure is close to that of the beam structure, no horizontal thrust is generated at both ends of the structure, and it can be well applied to various geological conditions; the beam top plate 2 of the beam-arch composite structure is flat and can be used as a roadway, and the arch plate 6 part is a flat arch with gradually varying heights and can be used as a sidewalk, so that people and vehicles are not coplanar, thereby ensuring the safety of pedestrians; the arch plate 6 of the beam-arch composite structure is shaped like a rainbow in the longitudinal direction, which has a certain landscape effect. The arch plate 6 is the highest at the mid-span position of the structure, and pedestrians can stop to observe the surrounding environment, so it is suitable for construction and use in locations where landscape requirements are high; because the middle arch structure separates the upper and lower roadways, the safety of oncoming vehicles is increased.

[0072] Furthermore, the beam-arch composite structure of the present invention can be applied to simply supported beam bridges as well as continuous beam bridges; and can be applicable to steel structures, ordinary reinforced concrete structures and prestressed reinforced concrete structures.

[0073] An embodiment of the construction method of the beam-arch composite structure of the present application comprises the following steps:

[0074] S1, construction of pile foundations, caps, piers, abutments and other substructures at the project site;

[0075] S2, install bridge bearings and related embedded parts;

[0076] S3, from bottom to top, sequentially fix and install the beam bottom plate 1, beam web plate, beam top plate 2, arch bottom plate 5, arch web plate and arch top plate 6;

[0077] S4, construction of bridge deck pavement and ancillary works;

[0078] S5, open to traffic.

[0079] Specifically, the beam bottom plate 1, beam web plate, beam top plate 2, arch bottom plate 5, arch web plate and arch top plate 6 are all reinforced concrete plates, and the beam bottom plate 1, beam web plate, beam top plate 2, arch bottom plate 5, arch web plate and arch top plate 6 all include steel mesh and concrete poured on the steel mesh.

[0080] In a specific embodiment of the construction method of the beam-arch composite structure of the present application, when the beam bottom plate 1, the beam web plate, the beam top plate 2, the arch bottom plate 5, the arch web plate and the arch top plate 6 are all reinforced concrete slabs, step S1 also includes: strengthening the support foundation, setting up the full-floor support, pre-pressing the support, and adjusting the support elevation.

[0081] Step S3 further includes:

[0082] S301, install the bottom formwork and side formwork of the beam;

[0083] S302, tie the beam bottom plate reinforcement grid and the beam web reinforcement grid;

[0084] S303, install the corrugated pipe and longitudinal prestressed steel tendons. If the beam structure is a continuous beam, it is also necessary to construct the negative bending moment steel tendons at the pier top;

[0085] S304, installing the beam inner formwork;

[0086] S305, tying 2 steel bars of the beam top plate and 5 steel bars of the arch bottom plate, and pre-embedding the steel bars of the arch web plate;

[0087] S306, pouring beam concrete onto the steel grid of the beam bottom plate 1, the steel grid of the beam web, the steel grid of the beam top plate 2, the steel grid of the arch bottom plate 5, and the steel grid of the arch web;

[0088] S307, after initial setting of concrete, install the soffit slab side formwork and inner membrane;

[0089] S308, pouring arch concrete onto the side form and inner membrane of the arch soffit plate;

[0090] S309, concrete curing;

[0091] S310, after the concrete age is greater than 7 days and the concrete strength and elastic modulus reach 85% of the design value, the formwork is removed and various prestressing methods are carried out;

[0092] S311, grouting and anchor sealing;

[0093] S312, remove the full-hall support.

[0094] Among them, the beam bottom plate 1, beam web plate, beam top plate 2, arch bottom plate 5, arch web plate and arch top plate 6 of the present application are all steel plates, and step S1 also includes: setting up temporary piers.

[0095] Step S3 further includes:

[0096] S31, hoist the upper beam-arch composite structure on site in sections and pieces;

[0097] S32, welding the beam-arch composite structure into a whole;

[0098] S33, remove temporary piers.

[0099] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A beam-arch composite structure, characterized in that: include: beam bottom plate; A beam top plate, spaced apart and arranged above the beam bottom plate; A beam web, wherein the beam webs are provided in plurality and arranged at intervals, the top of each beam web is fixedly connected to the beam top plate, and the bottom of each beam web is fixedly connected to the beam bottom plate; An arch bottom plate is fixedly arranged on the middle part of the beam top plate, and a motor vehicle lane for motor vehicles is reserved on the beam top plate on at least one side of the arch bottom plate; Arch top plates are arranged at intervals on the upper part of the arch bottom plates; A plurality of soffit plates are provided and arranged at intervals, the top of each soffit plate is fixedly connected to the arch top plate, the bottom of each soffit plate is fixedly connected to the arch bottom plate, and the soffit plates are raised to form an arch ring facade; The beam top plate and the arch bottom plate at the connecting portion of the beam and arch are fixedly integrated, so that the arch bottom plate serves as the beam top plate in the middle; The soffit plate includes a plurality of middle soffit plates arranged in the middle of the upper portion of the arch bottom plate and side soffit plates arranged on both sides of the upper portion of the arch bottom plate; An inspection path is reserved between the arch side web and the beam top plate; A sidewalk is reserved on the upper portion of the arch slab.

2. The beam-arch composite structure according to claim 1, characterized in that: The beam web comprises a plurality of beam middle webs provided in the middle of the upper portion of the beam bottom plate and beam side webs provided on both sides of the upper portion of the beam bottom plate, the lower ends of the beam middle webs and the lower ends of the beam side webs are both fixedly connected to the beam bottom plate, and the top ends of the beam middle webs and the top ends of the beam side webs are both fixedly connected to the beam top plate; The lower ends of the arch middle web and the lower ends of the arch side webs are both fixedly connected to the arch bottom plate, and the top ends of the arch middle web and the top ends of the arch side webs are both fixedly connected to the arch top plate.

3. The beam-arch composite structure according to claim 2, characterized in that: Each of the beam side webs is arranged vertically or inclined toward the middle of the beam bottom plate, and each of the beam middle webs is arranged vertically; Each of the arch side webs is arranged vertically or inclined, and each of the arch middle webs is arranged vertically.

4. The beam-arch composite structure according to claim 2, characterized in that: The beam side webs and the beam middle webs are both flat plates or curved plates in the longitudinal direction of the beam-arch composite structure; the arch side webs and the arch middle webs are both flat plates or curved plates in the longitudinal direction of the beam-arch composite structure.

5. The beam-arch composite structure according to any one of claims 2 to 4, characterized in that: The beam side webs and the beam middle webs are reinforced concrete slabs or steel plates; the arch side webs and the arch middle webs are reinforced concrete slabs or steel plates.

6. The beam-arch composite structure according to claim 2, characterized in that: The beam side webs and beam middle webs are solid web structures or hollow web truss structures; The arch side webs and arch middle webs are solid web structures or hollow web truss structures.

7. A construction method for the beam-arch composite structure according to any one of claims 1 to 6, characterized in that: The following steps are involved: S1, construction of pile foundations, caps, piers, abutments and other substructures at the project site; S2, install bridge bearings and related embedded parts; S3, fix and install the beam bottom plate, beam web plate, beam top plate, arch bottom plate, arch web plate and arch top plate in sequence from bottom to top; S4, construction of bridge deck pavement and ancillary works.

8. The construction method of the beam-arch composite structure according to claim 7, characterized in that: The beam bottom plate, beam web plate, beam top plate, arch bottom plate, arch soffit plate and arch top plate are all reinforced concrete plates, and the beam bottom plate, beam web plate, beam top plate, arch bottom plate, arch soffit plate and arch top plate all include steel mesh and concrete poured on the steel mesh; Step S1 also includes: strengthening the support foundation, setting up the full-height support, pre-pressing the support, and adjusting the support elevation; Step S3 further includes: S301, install the bottom formwork and side formwork of the beam; S302, tie the beam bottom plate reinforcement grid and the beam web reinforcement grid; S303, installation of corrugated pipes and longitudinal prestressed steel tendons; S304, installing the beam inner formwork; S305, tie the beam top plate steel bars and arch bottom plate steel bars, and pre-embed the arch web plate steel bars; S306, pouring beam concrete onto the steel grid of the beam bottom plate, the steel grid of the beam web, the steel grid of the beam top plate, the steel grid of the arch bottom plate, and the steel grid of the arch web; S307, after initial setting of concrete, install the soffit slab side formwork and inner membrane; S308, pouring arch concrete onto the side form and inner membrane of the arch soffit plate; S309, concrete curing; S310, after the concrete age is greater than 7 days and the concrete strength and elastic modulus reach 85% of the design value, the formwork is removed and various prestressing methods are carried out; S311, grouting and anchor sealing; S312, remove the full-hall support.

9. The construction method of the beam-arch composite structure according to claim 7, characterized in that: The beam bottom plate, beam web plate, beam top plate, arch bottom plate, arch web plate and arch top plate are all steel plates; Step S1 also includes: setting up temporary piers; Step S3 further includes: S31, hoist the upper beam-arch composite structure on site in sections and pieces; S32, weld the beam-arch composite structure into a whole; S33, remove the temporary piers.

Images