Steel-concrete composite beam crossing railway business line and construction method thereof

Abstract

This invention relates to the field of railway and highway bridge technology, and more specifically discloses a steel-concrete composite beam and its construction method for crossing an operational railway line. The beam includes a steel box girder with steel flanges fixedly connected to both sides of its top. Tie bars are provided inside the top of the steel flanges, and stiffeners are provided on the sides of the tie bars. A connecting end is fixedly connected to one end of the steel box girder, with a bottom tie bar fixedly connected inside the connecting end and an upper tie bar fixedly connected inside the connecting end. The bottom and upper tie bars correspond to each other. A steel frame cage is provided inside the separating support and is located within the connecting end. This design improves overall strength and stability, provides a simple and practical structure, and facilitates construction. It allows the connecting section to more evenly and smoothly transmit axial force, shear force, bending moment, and deformation generated by various loads, exhibiting good fatigue resistance and durability.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of railway and highway bridges, and more particularly to a steel-concrete composite beam crossing a railway operating line and a construction method thereof. BACKGROUND

[0002] The steel-concrete composite beam is a beam in which a steel beam and a reinforced concrete slab supported by the steel beam are combined into an integral whole through shear connectors and work together, and the composite beam can better exert the material characteristics of steel and concrete, i.e., the tensile property of steel and the compressive property of concrete, and compared with a steel beam working alone, the stability and torsional property of the composite beam are improved, and the anti-rust and fire resistance are also enhanced.

[0003] The steel-concrete composite beam has been widely used in railway and highway bridges due to its advantages of large rigidity, excellent material characteristics and convenient and fast construction. The conventional construction method of the steel-concrete composite beam mainly includes the following steps: manufacturing I-shaped steel beams in sections in a factory, setting up a beam assembling site at a construction site, assembling the steel beam sections and cross beams on the assembling platform according to the manufacturing line shape and camber, pouring the bridge deck on the assembled steel beam as a base mold support and erecting a formwork, and then removing the cross beams between each section after the completion of the pouring, transporting each section of the steel-concrete composite beam by using a beam transporting trolley, and erecting the beam by using a bridge erecting machine.

[0004] However, after the erection, the combined section of the steel beam and the concrete beam is subjected to complex stress due to the pressure from multiple directions, and the stress is concentrated at the intersection of the steel plate of the face, web and top and bottom plates of the combined section, and the prestress also causes local stress concentration, which makes the stress of the composite beam uneven and easy to deform and crack, thereby reducing the service life. SUMMARY

[0005] In order to overcome the above-mentioned defects of the prior art, the present application provides a steel-concrete composite beam crossing a railway operating line and a construction method thereof to solve the problems in the background art.

[0006] The present application provides the following technical scheme: a steel-concrete composite beam crossing a railway operating line, comprising a steel box beam, steel flanges are fixedly connected to the top of both sides of the steel box beam, a tie steel is arranged in the inside of the top of the steel flange, a steel flange is fixedly connected to one end of the tie steel, a steel box beam is fixedly connected to the other end of the tie steel, a stiffening shank is arranged on the side of the tie steel, a steel flange is arranged at one end of the stiffening shank, a steel box beam is arranged at the other end of the stiffening shank, a bottom layer of reinforcing steel bars is arranged at the bottom end and the middle of the inside of the steel flange, and a combined end is fixedly connected to one end of the steel box beam.

[0007] The inner part of the connecting end of the combination end is provided with a connecting end, the inner part of the combination end is fixedly connected with a bottom layer of a pull buckle, the inner part of the combination end is fixedly connected with a plug-in rib, the inner part of the combination end close to one end of the connecting end is fixedly connected with a partition support, the inner part of the connecting end is fixedly connected with an upper layer of a pull buckle, the bottom layer of the pull buckle and the upper layer of the pull buckle correspond to each other, the inner side of the partition support is provided with a steel cage, and the steel cage is arranged in the combination end.

[0008] Further, the top end of the steel box girder is provided with a pavement slab, the inner part of the pavement slab is provided with a longitudinal main rib, the side of the longitudinal main rib is provided with a longitudinal reinforcing rib, the top end of the longitudinal main rib is provided with a transverse main rib, and the side of the transverse main rib is provided with a transverse reinforcing rib.

[0009] Further, the distance between the plug-in rib and the bottom layer of the pull buckle is the distance of one upper layer of the pull buckle width, and the distance between the partition supports is the center line between the bottom layers of the pull buckles.

[0010] Further, the steel cage is externally laced and laid in the partition support, the inner part of the steel cage is filled with tensile and compressive fiber concrete, and the inner part of the bottom layer of the pull buckle is filled with tensile and compressive fiber concrete through the steel cage.

[0011] Further, the two sides of the top end of the pavement slab are fixedly connected with guardrails, and one side of the guardrail is fixedly connected with a closing plate.

[0012] Further, the inner part of the steel flange is filled with tensile and compressive fiber concrete, the longitudinal main rib, the transverse main rib, the longitudinal reinforcing rib and the transverse reinforcing rib in the inner part of the top end pavement slab at the connection between the steel flange and the steel box girder are normal laying quantity times, the strength grade is improved by one level, and the filled concrete is tensile and compressive fiber concrete.

[0013] Further, the inner part of the connecting end and the combination end is filled with tensile and compressive fiber concrete, the longitudinal main rib, the transverse main rib, the longitudinal reinforcing rib and the transverse reinforcing rib in the inner part of the top end pavement slab at the connection between the connecting end and the combination end are normal laying quantity times, the strength grade is improved by one level, and the filled concrete is tensile and compressive fiber concrete.

[0014] Further, the steel box girder is filled with concrete.

[0015] Further, the construction method of the steel-concrete combined beam crossing the railway business line comprises the following steps:

[0016] Step: the staff first makes the steel box girder, steel flange, tie steel, combination end, connecting end, plug-in rib, partition support, bottom tie buckle and upper tie buckle in the factory, and then assembles and splices on the assembly platform, first fixes and connects the combination end with one end of the steel box girder, and then fixes and connects the connecting end with the other end of the steel box girder, and then installs the two steel flanges and tie steels on both sides of the top of the steel box girder, combination end and connecting end and fixes and connects them;

[0017] Step: then lay the bottom reinforcing steel bar in the steel flange, and then lay the stiffening shank at the top inside the steel flange, then support the formwork at the top of the steel box girder and steel flange, and then bind the longitudinal main reinforcement, transverse main reinforcement, longitudinal supplementary reinforcement and transverse supplementary reinforcement in the formwork;

[0018] Step: then butt joint the combination end and connecting end, and connect the bottom tie buckle and upper tie buckle together, and make the other end of the plug-in rib and partition support contact with the inner wall of the connecting end, then place the steel cage in the combination end, and then support the formwork at the top of the connecting end and combination end, and then bind the longitudinal main reinforcement, transverse main reinforcement, longitudinal supplementary reinforcement and transverse supplementary reinforcement in the formwork;

[0019] Step: pour the tensile and compressive fiber concrete in the steel flange, combination end and connecting end inside and top formwork, and after the concrete solidifies and reaches the design strength to form the pavement slab, remove the formwork, and then erect by the jacking method to form a structure with higher stability and more uniform stress.

[0020] Technical effects and advantages of the present application:

[0021] 1. The combination end and connecting end are beneficial to the combination of the combination section, make the stress of the combination section more uniform after being subjected to multiple pressures, have higher stress strength, and the structure is more firm and stable.

[0022] 2. The bottom tie buckle, upper tie buckle, steel cage, plug-in rib and partition support are beneficial to the combination of the connecting end and combination end, improve the overall strength and stability of the combination end and combination end through the clamping of the bottom tie buckle and upper tie buckle, have simple and practical structure, convenient construction, make the combination section more uniformly and smoothly transmit the axial force, shear force, bending moment and deformation generated by various loads, and have good fatigue resistance and durability.

[0023] 3. The steel flange and tie steel are beneficial to the connection, the steel flange can support the formwork and has a protection function, the tie steel is tightened, the rigidity and stability are higher, the integrality of the pouring is better when pouring, the structure is more firm and stable, the load is more uniformly and smoothly borne, and the bearing capacity is stronger. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 is a schematic diagram of the overall structure of the present application.

[0025] Figure 2 is a schematic diagram of the overall cross-sectional structure of the present application.

[0026] Figure 3 is a schematic diagram of the steel flange structure of the present application.

[0027] Figure 4 is a schematic diagram of the joint segment structure of the present application.

[0028] Figure 5 is a schematic diagram of the joint segment separation structure of the present application.

[0029] Figure 6 is a schematic diagram of the joint segment connection structure of the present application.

[0030] Figure 7 is a schematic diagram of the tie-in buckle structure of the present application.

[0031] Figure 8 is a schematic diagram of the steel bar laying structure of the present application.

[0032] The reference signs are: 1, steel box girder; 101, steel flange; 102, joint end; 103, tie-in steel; 104, bottom layer added steel bar; 105, connection end; 106, stiffening shank; 2, road surface slab; 201, longitudinal main reinforcement; 202, transverse main reinforcement; 203, longitudinal supplemental reinforcement; 204, transverse supplemental reinforcement; 3, steel cage; 301, spliced reinforcement; 302, partition support; 4, bottom layer tie-in buckle; 401, upper layer tie-in buckle; 5, guardrail; 6, closure plate. DETAILED DESCRIPTION

[0033] The technical solutions in the present application will be described clearly and completely below in combination with the drawings in the present application, and in addition, the forms of each structure described in the following embodiments are only examples, and the overpass railway operating line steel-concrete composite girder and construction method involved in the present application are not limited to each structure described in the following embodiments, and all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the scope of protection of the present application.

[0034] According to the description attached Figures 1-8The embodiment discloses a steel-concrete combined beam crossing a railway business line, which comprises a steel box beam 1, steel flanges 101 are fixedly connected to both sides of the top end of the steel box beam 1, a tie steel 103 is arranged in the inside of the top end of the steel flange 101, one end of the tie steel 103 is fixedly connected with the steel flange 101, the other end of the tie steel 103 is fixedly connected with the steel box beam 1, a stiffening shank 106 is arranged on the side of the tie steel 103, one end of the stiffening shank 106 is provided with the steel flange 101, and the other end of the stiffening shank 106 is provided with the steel box beam 1, bottom layer reinforcing steels 104 are arranged at the bottom end and the middle of the inside of the steel flange 101, and one end of the steel box beam 1 is fixedly connected with a combined end 102.

[0035] The inside of one end of the combined end 102 is provided with a connecting end 105, the inside of the combined end 102 is fixedly connected with a bottom layer tie buckle 4, the inside of the combined end 102 is fixedly connected with a plug-in reinforcing rib 301, the inside of one end of the combined end 102 close to the connecting end 105 is fixedly connected with a partition support 302, the inside of the connecting end 105 is fixedly connected with an upper layer tie buckle 401, the bottom layer tie buckle 4 and the upper layer tie buckle 401 correspond to each other, the inside of the partition support 302 is provided with a steel cage 3, and the steel cage 3 is arranged in the combined end 102.

[0036] The embodiment needs to be supplemented that the structural components in the above and the prior art are mainly different from the combined end 102, the connecting end 105, the bottom layer tie buckle 4 and the upper layer tie buckle 401, the main role is that, when the combined section is connected, the bottom layer tie buckle 4 and the upper layer tie buckle 401 are translated and clamped together through the movement of the connecting end 105 in the inside of the combined end 102, the integrity, the strength and the stability between the combined section and the steel box beam 1 are improved, the structure is simple and convenient for construction, the combined section can more smoothly transmit various axial forces, shearing forces, bending moments and deformations generated by the combined section, and the combined section has good fatigue resistance and durability.

[0037] According to the description attached Figure 2 and Figure 8 The top end of the steel box beam 1 is provided with a pavement slab 2, the inside of the pavement slab 2 is provided with longitudinal main reinforcing steels 201, the side of the longitudinal main reinforcing steel 201 is provided with longitudinal reinforcing steels 203, the top end of the longitudinal main reinforcing steel 201 is provided with transverse main reinforcing steels 202, and the side of the transverse main reinforcing steel 202 is provided with transverse reinforcing steels 204.

[0038] The embodiment needs to be specifically explained that the longitudinal main reinforcement 201 is a longitudinal load-bearing main reinforcement, the longitudinal reinforcing bar 203 is a longitudinal compression and tension reinforcing bar, the transverse main reinforcement 202 is a transverse load-bearing main reinforcement, the transverse reinforcing bar 204 is a transverse compression and tension reinforcing bar, the transverse main reinforcement 202 and the transverse reinforcing bar 204 are fixedly connected at the top of the longitudinal main reinforcement 201 and the longitudinal reinforcing bar 203, and the longitudinal main reinforcement 201, the transverse main reinforcement 202, the longitudinal reinforcing bar 203 and the transverse reinforcing bar 204 are laid on the top of the steel box girder 1 according to the construction requirements, and the strength grade (1 level) of the laid reinforcing bar is increased, the laying distance and density are increased to 2 times of the normal laying when the steel box girder 1 and the steel flange 101 are connected, and the strength grade (1 level) of the laid reinforcing bar is increased, the laying distance and density are increased to 2 times of the normal laying when the connecting end 105 and the steel box girder 1 are connected.

[0039] According to the description Figure 5 , the distance between the plug-in reinforcement 301 and the bottom layer of the pull buckle 4 is the width of the upper layer of the pull buckle 401, and the center line between the bottom layer of the pull buckle 4 is separated by the plug-in reinforcement 301; the embodiment needs to be specifically explained that when the bottom layer of the pull buckle 4 and the upper layer of the pull buckle 401 are connected, the plug-in reinforcement 301 is reserved in the middle of the plug-in reinforcement 301, which is more smooth when the plug-in reinforcement 301 is connected, and the hollow space left in the middle after the connection is completed meets the design requirements of strength, stiffness and deflection when pouring.

[0040] According to the description Figures 4-7 , the steel cage 3 is externally tied and connected to be laid inside the partition support 302, the inside of the steel cage 3 is filled with anti-tension and anti-compression fiber concrete, and the inside of the bottom layer of the pull buckle 4 is filled with anti-tension and anti-compression fiber concrete through the steel cage 3;

[0041] The embodiment needs to be specifically explained that the steel cage 3 is a tied cage, the steel cage 3 is located at the center position of the connecting end 102 and the connecting end 105, and after pouring, the position of the connecting section is more stable, and the poured concrete has good self-compacting property, good compactness, low shrinkage rate, good combination of reinforced concrete, and prevents cracking and affects the use effect.

[0042] According to the description Figure 1 , the top of the pavement slab 2 is fixedly connected with a guardrail 5 on both sides, and the guardrail 5 is fixedly connected with a closing plate 6 on one side;

[0043] The embodiment needs to be specifically explained that after the construction is completed, the two sides of the combined beam are protected, so that the subsequent pedestrians are safer when passing, and the noise generated is weakened and isolated, thereby providing a more quiet and comfortable living circle for the surrounding residents.

[0044] According to the description attached Figures 2-3 The inside of the steel flange 101 is filled with tensile and compressive fiber concrete, the longitudinal main reinforcement 201, the transverse main reinforcement 202, the longitudinal reinforcing reinforcement 203 and the transverse reinforcing reinforcement 204 inside the top pavement slab 2 at the connection between the steel flange 101 and the steel box girder 1 are 2 times the normal laying quantity, the strength grade is improved by one level, and the filled concrete is tensile and compressive fiber concrete.

[0045] The embodiment needs to be specifically explained that the steel flange 101 can be used as a formwork for pouring, so that the integrity is better, and when pouring, the steel flange 101 is connected to the steel box girder 1 by the tie steel 103 to form a triangular shape, because the triangle has stability, the integrity is better, the stability is higher, and the strength effect is better during subsequent pouring. At the connection between the steel flange 101 and the steel box girder 1, because the connection is a weak part, to prevent cracking and affect subsequent use, during pouring, according to design requirements, reinforcing steel bars are added at the connection and an appropriate amount of compressive and tensile fiber is mixed in the concrete to strengthen it. The compressive and tensile fiber is mainly used to strengthen the connection weak part to improve the overall performance and increase the service life of the weak part.

[0046] According to the description attached Figures 2-6 The inside of the steel flange 101 is filled with tensile and compressive fiber concrete, the longitudinal main reinforcement 201, the transverse main reinforcement 202, the longitudinal reinforcing reinforcement 203 and the transverse reinforcing reinforcement 204 inside the top pavement slab 2 at the connection between the steel flange 101 and the steel box girder 1 are 2 times the normal laying quantity, the strength grade is improved by one level, and the filled concrete is tensile and compressive fiber concrete.

[0047] The embodiment needs to be specifically explained that when the combined end 102 and the connecting end 105 are connected and poured, the structure of the steel-concrete combined section is more, the space is smaller, and the concrete pouring, curing and compaction are performed under the condition that the steel-concrete elastic modulus difference is large, the expansion coefficient is different, and the construction position is under the condition of stable environment and humidity change. The concrete needs to have good self-compacting property, ensure compactness, low shrinkage rate, ensure steel-concrete combination, high toughness, fatigue resistance, and ensure the mechanical matching between the steel-concrete structure.

[0048] According to the description attached Figures 1-2The steel box girder 1 is filled with concrete;

[0049] It is to be particularly noted that after the formwork support of the upper part of the steel box girder 1 is completed, the upper part is poured with concrete. Due to different environments, temperatures and humidities of the construction site, different shrinkage and curing methods of the concrete, the construction can be carried out according to the design requirements under the conditions of meeting the compactness, low shrinkage, fatigue resistance and high toughness of the concrete.

[0050] The embodiment specifically discloses a construction method of a steel-concrete composite girder crossing a railway operating line.

[0051] Step 1: The staff first manufactures the steel box girder 1, the steel flange 101, the tie steel 103, the joint end 102, the connecting end 105, the insertion rib 301, the separation support 302, the bottom tie buckle 4 and the upper tie buckle 401 in a factory, and then carries out assembly on an assembly platform after the construction of an assembly site, fixes and connects the joint end 102 and one end of the steel box girder 1, fixes and connects the connecting end 105 and the other end of the steel box girder 1, and then respectively installs the two steel flanges 101 and the tie steel 103 on both sides of the top end of the steel box girder 1, the joint end 102 and the connecting end 105 and fixes and connects them;

[0052] Step 2: The staff then lays the bottom added steel bar 104 in the steel flange 101, lays the stiffening shank 106 at the top end in the steel flange 101 after the laying is completed, supports the formwork at the top end of the steel box girder 1 and the steel flange 101, and binds the longitudinal main rib 201, the transverse main rib 202, the longitudinal reinforcing rib 203 and the transverse reinforcing rib 204 in the formwork;

[0053] Step 3: The staff then connects the joint end 102 and the connecting end 105, connects the bottom tie buckle 4 and the upper tie buckle 401 together, contacts the other end of the insertion rib 301 and the separation support 302 with the inner wall of the connecting end 105, places the steel cage 3 in the joint end 102, and supports the formwork at the top end of the connecting end 105 and the joint end 102, and binds the longitudinal main rib 201, the transverse main rib 202, the longitudinal reinforcing rib 203 and the transverse reinforcing rib 204 in the formwork;

[0054] Step 4: The staff pours the tensile and compressive fiber concrete in the steel flange 101, the joint end 102 and the connecting end 105 and the top formwork, removes the formwork after the concrete is solidified and reaches the design strength to form the pavement slab 2, and erects the guardrail 5 and the closure plate 6 on the pavement slab 2 to form higher stability and more uniform force.

[0055] Finally: the above only for the preferred embodiments of the present application, and not for limiting the present application, any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application, should be included in the scope of protection of the present application.

Claims

1. A steel-concrete composite beam for overpassing a railway operating line, comprising a steel box girder (1), characterized in that: The both sides of the top of the steel box girder (1) are fixedly connected with steel flanges (101), the inside of the top of the steel flange (101) is provided with a tie steel (103), one end of the tie steel (103) is fixedly connected with the steel flange (101), the other end of the tie steel (103) is fixedly connected with the steel box girder (1), the side of the tie steel (103) is provided with a stiffening shank (106), one end of the stiffening shank (106) is provided with a steel flange (101), the other end of the stiffening shank (106) is provided with a steel box girder (1), the bottom and the middle of the inside of the steel flange (101) are provided with bottom layer reinforcing steels (104), and one end of the steel box girder (1) is fixedly connected with a joint end (102). The inside of one end of the joint end (102) is provided with a connecting end (105), the inside of the joint end (102) is fixedly connected with a bottom layer tie buckle (4), the inside of the joint end (102) is fixedly connected with a plug-in rib (301), the inside of one end of the joint end (102) close to the connecting end (105) is fixedly connected with a separation support (302), the inside of the connecting end (105) is fixedly connected with an upper layer tie buckle (401), the bottom layer tie buckle (4) and the upper layer tie buckle (401) correspond to each other, the inside of the separation support (302) is provided with a steel cage (3), and the steel cage (3) is arranged in the joint end (102).

2. The steel-concrete composite girder according to claim 1, wherein: The top of the steel box girder (1) is provided with a pavement slab (2), the inside of the pavement slab (2) is provided with a longitudinal main rib (201), the side of the longitudinal main rib (201) is provided with a longitudinal reinforcing rib (203), the top of the longitudinal main rib (201) is provided with a transverse main rib (202), and the side of the transverse main rib (202) is provided with a transverse reinforcing rib (204).

3. The steel-concrete composite girder according to claim 1, wherein: The distance between the plug-in rib (301) and the bottom layer tie buckle (4) is the width of one upper layer tie buckle (401).

4. The steel-concrete composite girder according to claim 1, wherein: The steel cage (3) is externally laced and arranged in the inside of the separation support (302), the inside of the steel cage (3) is filled with anti-tension and anti-pressure fiber concrete, and the inside of the bottom layer tie buckle (4) is filled with the anti-tension and anti-pressure fiber concrete through the steel cage (3).

5. The steel-concrete composite beam according to claim 2, wherein: The both sides of the top of the pavement slab (2) are fixedly connected with guardrails (5), and one side of the guardrail (5) is fixedly connected with a closing plate (6).

6. The steel-concrete composite girder according to claim 1, wherein: The inside of the steel flange (101) is filled with anti-tension and anti-pressure fiber concrete, the longitudinal main rib (201), the transverse main rib (202), the longitudinal reinforcing rib (203) and the transverse reinforcing rib (204) in the inside of the top pavement slab (2) at the joint of the steel flange (101) and the steel box girder (1) are two times of the normal laying quantity, the strength grade is improved by one level, and the filled concrete is anti-tension and anti-pressure fiber concrete.

7. The steel-concrete composite girder according to claim 1, wherein: The connecting end (105) and the joint end (102) are filled with tensile and compressive fiber concrete, the longitudinal main reinforcement (201), the transverse main reinforcement (202), the longitudinal reinforcing bar (203) and the transverse reinforcing bar (204) inside the top pavement slab (2) at the joint of the connecting end (105) and the joint end (102) are two times of the normal laying quantity, the strength grade is improved by one level, and the filled concrete is tensile and compressive fiber concrete.

8. The steel-concrete composite girder according to claim 1, wherein: The steel box girder (1) is filled with concrete.

9. The method of constructing a steel-concrete composite beam overpassing a railway operating line according to claim 1, characterized in that: The construction method comprises the following steps: Step 1: The staff first manufactures the steel box girder (1), the steel flange (101), the tie steel (103), the joint end (102), the connecting end (105), the insertion rib (301), the separation support (302), the bottom tie buckle (4) and the upper tie buckle (401) in the factory, and then assembles and splices on the assembly platform after the manufacturing is completed, first fixes and connects the joint end (102) and one end of the steel box girder (1), then fixes and connects the connecting end (105) and the other end of the steel box girder (1), and then respectively installs the two steel flanges (101) and the tie steel (103) on both sides of the top end of the steel box girder (1), the joint end (102) and the connecting end (105) and fixes and connects them; Step 2: Then, the bottom reinforcing steel bar (104) is laid in the steel flange (101), the stiffening shank (106) is laid at the top end inside the steel flange (101) after the laying is completed, the formwork is erected at the top end of the steel box girder (1) and the steel flange (101), and the longitudinal main reinforcement (201), the transverse main reinforcement (202), the longitudinal reinforcing bar (203) and the transverse reinforcing bar (204) are bound in the formwork; Step 3: Then, the joint end (102) and the connecting end (105) are butt-jointed, the bottom tie buckle (4) and the upper tie buckle (401) are clamped, the other end of the insertion rib (301) and the separation support (302) is in contact with the inner wall of the connecting end (105), the steel cage (3) is placed in the joint end (102), the formwork is erected at the top end of the connecting end (105) and the joint end (102), and the longitudinal main reinforcement (201), the transverse main reinforcement (202), the longitudinal reinforcing bar (203) and the transverse reinforcing bar (204) are bound in the formwork; Step 4: The steel flange (101), the joint end (102) and the connecting end (105) inside and the top formwork are poured with tensile and compressive fiber concrete, the formwork is removed after the concrete is solidified and reaches the design strength to form the pavement slab (2), and the guardrail (5) and the closure plate (6) are erected on the pavement slab (2).

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