A detachable prefabricated closed-type profiled steel-concrete composite beam and its construction method

Abstract

This invention relates to a detachable prefabricated closed-type profiled steel-concrete composite beam and its construction method. The beam includes a prefabricated steel-concrete composite web, tenon-and-mortise steel connectors inserted into the upper part of the prefabricated steel-concrete composite web, and a prefabricated bridge deck panel used in conjunction with the tenon-and-mortise steel connectors. The tenon-and-mortise steel connectors include a flat steel plate, two first vertical steel plates located below the flat steel plate, and two second vertical steel plates located above the flat steel plate. The two first vertical steel plates are inserted into the upper part of the prefabricated steel-concrete composite web. Shear studs are uniformly welded onto the flat steel plate between the two second vertical steel plates. Multiple equally spaced L-shaped limiting grooves are formed on the two second vertical steel plates. Extending reinforcing bars are provided laterally along the edges of the prefabricated bridge deck panel. The ends of the extending reinforcing bars are bent to form U-shaped extending reinforcing bars that cooperate with the shear studs and L-shaped limiting grooves. The composite beam is detachable, components are replaceable, and the construction period is shortened.

Description

Technical Field

[0001] This invention belongs to the field of bridge construction technology and relates to a detachable prefabricated closed profiled steel-concrete composite beam and its construction method. Background Technology

[0002] In steel-concrete composite beams, the connection between the concrete and the steel beams is mainly achieved through shear connectors on the steel beams. However, conventional shear connectors are prone to fatigue failure, and the failure of shear connectors can spread from a localized area to the entire composite beam. In severe cases, it may even lead to the replacement of the main steel beam.

[0003] Steel-concrete composite beams can effectively utilize the tensile strength of steel and the compressive strength of concrete. However, in the negative bending moment zone of continuous beams, the phenomenon of steel being under compression and concrete slabs being under tension cannot be avoided. While fully utilizing the advantages of steel-concrete composite beams, the disadvantages of both will also be exposed.

[0004] Therefore, there is currently a lack of a detachable prefabricated closed profiled steel-concrete composite beam, in which the outer closed profiled steel can delay the cracking of the concrete in the web and improve the load-bearing capacity of the web, and the intermediate connectors enable the composite beam to be detachable and the composite beam components to be replaceable. Summary of the Invention

[0005] In view of the above, the technical problem to be solved by the present invention is to address the shortcomings of the prior art by providing a detachable prefabricated closed-end profiled steel-concrete composite beam and its construction method. The outer closed-end profiled steel can delay the cracking of the concrete in the web and improve the load-bearing capacity of the web. The tenon and mortise joints in the middle allow the composite beam to be detachable and the components to be replaceable, while also transmitting shear force. All components of the composite beam are prefabricated in the factory and assembled on site, which can achieve rapid construction, shorten the construction period, and at the same time, the prefabricated components can be replaced, reducing the later maintenance costs.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A detachable prefabricated closed profiled steel-concrete composite beam includes a prefabricated steel-concrete composite structural web, tenon-and-mortise steel connectors inserted into the upper end of the prefabricated steel-concrete composite structural web, and a prefabricated bridge deck that cooperates with the tenon-and-mortise steel connectors.

[0008] The web of the precast steel-concrete composite structure includes a precast web structure formed by internal concrete pouring and a U-shaped closed profiled steel sheet that encloses the precast web structure.

[0009] The tenon-and-mortise steel connector includes a flat steel plate, two first vertical steel plates located at the lower part of the flat steel plate, and two second vertical steel plates located at the upper part of the flat steel plate. The two first vertical steel plates are inserted into the upper part of the web of the precast steel-concrete composite structure. Shear studs are evenly welded on the flat steel plate between the two second vertical steel plates. Multiple L-shaped limiting grooves with equal distances are opened on the two second vertical steel plates.

[0010] The precast bridge deck has a crisscrossing steel mesh inside, and there are outward-extending steel bars along the edges of the precast bridge deck. The ends of the outward-extending steel bars are bent to form U-shaped outward-extending steel bars that work in conjunction with shear studs and L-shaped limiting grooves.

[0011] The beneficial effects of this basic scheme are as follows: using U-shaped closed profiled steel sheets as concrete pouring templates for precast web structures, the outer U-shaped closed profiled steel sheets can delay the cracking of concrete in the web and improve the load-bearing capacity of the web. At the same time, due to the closed ribs of the profiled steel sheets, the interlocking between the profiled steel sheets and concrete is increased, improving the bond strength between the two. Through the L-shaped limiting grooves on the second vertical steel plate, the U-shaped protruding steel bars of the precast bridge deck are spliced ​​together with shear studs along the L-shaped grooves to form a whole. The tenon and mortise connectors allow the composite beam to be disassembled and the components to be replaced, while transferring shear force. All components are precast in the factory, which can achieve rapid construction and shorten the construction period.

[0012] Furthermore, multiple bolt holes are provided at the upper end of the U-shaped closed profiled steel sheet, and bolt holes matching the bolt holes are pre-drilled at the corresponding positions on the upper end of the precast web structure. Beneficial effect: By inserting high-strength bolts into the bolt holes, the U-shaped closed profiled steel sheet and the precast web structure are connected as a whole.

[0013] Furthermore, the first vertical steel plate has holes corresponding to the bolt holes, and the two first vertical steel plates and the flat steel plate between them form an inverted U-shaped recessed area. This recessed area is inserted into the upper end of the precast steel-concrete composite structure web and connected to the web via high-strength bolts inserted into the holes in the first vertical steel plates. Beneficial effect: The high-strength bolts facilitate convenient connection between the tenon and mortise joints and the precast steel-concrete composite structure web, enabling detachment.

[0014] Furthermore, multiple triangular reinforcing plates are welded and fixed at even intervals between the two first vertical steel plates on the side away from the lower groove area and the flat steel plate. Beneficial effect: The triangular reinforcing plates improve the stability of the corners of the flat steel plate, preventing corner instability during the connection between the precast bridge deck and the tenon-and-mortise steel connectors.

[0015] Furthermore, the two second vertical steel plates and the flat steel plate between them form a U-shaped upper groove area, which serves as a post-cast strip for the bridge deck concrete. Shear studs are evenly welded into the upper groove area; the distance between the two second vertical steel plates is greater than the distance between the two first vertical steel plates. Beneficial effect: The upper groove area facilitates the use of extended reinforcing bars in conjunction with shear studs.

[0016] Furthermore, the end concrete of the precast bridge deck is set in a two-layer stepped shape. The transverse steel bars in the steel mesh inside the upper layer of concrete extend outward and the ends of the steel bars are bent horizontally to form U-shaped outward steel bars.

[0017] Furthermore, the bent sections of the extended reinforcing bars are fitted onto the locations of the shear studs. Beneficial effects: By connecting the extended reinforcing bars to the shear studs, the precast steel-concrete composite structure web, tenon-and-mortise steel connectors, and precast bridge deck are integrated into a single unit, enabling component replacement and shortening the construction period.

[0018] Furthermore, the diameter of the extended reinforcing bar should be smaller than the width of the L-shaped limiting groove; the length of the horizontal section of the extended reinforcing bar after bending should be smaller than the horizontal length before bending; and the bending radius of the extended reinforcing bar should be larger than the diameter of the welded shear stud. Beneficial effects: The extended reinforcing bar passes smoothly through the L-shaped limiting groove and is accurately positioned; the horizontal section of the extended reinforcing bar is engaged in the previous L-shaped limiting groove, providing longitudinal limitation for the horizontal section of the previous extended reinforcing bar; the bending radius of the extended reinforcing bar is larger than the diameter of the welded shear stud, facilitating lateral limiting adjustment after the precast bridge deck and tenon joint are inserted, allowing the shear stud to act as a limiting rod for lateral limiting of the U-shaped extended reinforcing bar, thus stabilizing the pre-connection of the bridge deck and the joint.

[0019] Furthermore, a distance is reserved between the protruding reinforcing bars of the precast bridge deck and the concrete at the end of the precast bridge deck; the surface of the stepped concrete of the precast bridge deck is roughened. Beneficial effects: The reserved distance prevents collisions between the precast bridge deck and the tenon-and-mortise connectors during assembly, and also facilitates the lateral rearward movement of the precast bridge deck and the positioning of the L-shaped limiting groove.

[0020] A construction method for a detachable prefabricated closed-type profiled steel-concrete composite beam includes the following steps:

[0021] S1: In the engineering fabrication of precast steel-concrete composite structure webs, tenon-and-mortise steel connectors, and precast bridge decks, specifically:

[0022] S11: Bend the closed profiled steel sheet according to the design dimensions to form a U-shaped closed profiled steel sheet, and make bolt holes at its ends to make it a U-shaped casting template.

[0023] S12: Concrete is poured inside the U-shaped closed profiled steel sheet to complete the preparation of the web of the precast steel-concrete composite structure;

[0024] S13: According to the design dimensions, make holes in the first vertical steel plate and open equidistant L-shaped limiting grooves in the second vertical steel plate;

[0025] S14: The installation design dimensions are to weld the two first vertical steel plates and the two second vertical steel plates to the corresponding positions of the flat steel plate, and to evenly weld shear nails to the corresponding positions in the upper groove area to complete the preparation of the tenon and mortise steel connector.

[0026] S15: The upper layer of steel mesh is arranged in the mold of the precast bridge deck, and the end steel bars are bent to make them into U-shaped outward reinforcing bars.

[0027] S16: Pour concrete into the mold, cure for a period of time, and then roughen the end surface to complete the preparation of the precast bridge deck.

[0028] S2: At the construction site, the precast steel-concrete composite structure web, tenon-and-mortise steel connectors, and precast bridge deck are assembled to complete the assembly of the composite beam. Specifically:

[0029] S21: Hoist the tenon and tenon steel connectors so that the lower groove area corresponds to the end of the precast steel-concrete composite structure web plate for insertion, and at the same time, align the opening positions between the two one by one, pass high-strength bolts through the openings, and tighten high-strength nuts to connect the two into a whole.

[0030] S22: Hoist a precast bridge deck so that the U-shaped protruding steel bar at its end corresponds to the L-shaped limiting groove on the second vertical steel plate, so that the protruding steel bar enters the bottom of the L-shaped limiting groove. At this time, the bend of the protruding steel bar also corresponds to the welded shear nail passing through the tenon and mortise steel connector.

[0031] S23: Adjust the position of the precast bridge deck and move it laterally backward so that the horizontal section of the extended steel bar after bending enters the L-shaped limiting groove, which plays a longitudinal limiting role. At the same time, the bent part of the extended steel bar just contacts the welded shear stud, which plays a lateral limiting role.

[0032] S24: Follow step S23 to complete the assembly of the other precast bridge deck and the tenon and mortise steel connector;

[0033] S25: Concrete is poured into the post-cast strip formed between the two precast bridge decks to cast the precast bridge decks together with the tenon and mortise connectors, thus completing the assembly of the composite beam.

[0034] The beneficial effects of this invention are as follows:

[0035] 1. The detachable prefabricated assembled closed profiled steel-concrete composite beam disclosed in this invention uses U-shaped closed profiled steel sheets as templates for pouring web concrete. The outer U-shaped closed profiled steel sheets can delay the cracking of the concrete in the web and improve the load-bearing capacity of the web. Since the U-shaped closed profiled steel sheets have closed ribs, the interlocking between the profiled steel sheets and the concrete is increased, and the bond strength between the two is improved.

[0036] 2. The detachable prefabricated closed-end profiled steel-concrete composite beam disclosed in this invention welds two first vertical steel plates and two second vertical steel plates to corresponding positions on a flat steel plate. Shear studs are uniformly welded in the upper groove area, and an L-shaped limiting groove is opened on the second vertical steel plate, making the composite beam detachable and the components replaceable, thus reducing later maintenance costs. It also transmits shear force. At the same time, triangular reinforcing plates are welded between the two first vertical steel plates and the flat steel plate to improve the stability of the corners of the flat steel plate.

[0037] 3. The detachable prefabricated assembled closed-type profiled steel-concrete composite beam disclosed in this invention involves horizontally bending the ends of the protruding reinforcing bars of the prefabricated bridge deck to form U-shaped protruding reinforcing bars. The U-shaped protruding reinforcing bars pass through the L-shaped limiting grooves on the second vertical steel plate of the tenon and mortise connector. Simultaneously, the entire prefabricated bridge deck is slightly moved along the longitudinal direction of the bridge so that the horizontal segment of the bent protruding reinforcing bar corresponds to the previous L-shaped limiting groove. Then, the prefabricated bridge deck is moved laterally outward so that the U-shaped segment of the protruding reinforcing bar is inserted into the previous corresponding L-shaped limiting groove, fixing the protruding reinforcing bar in the L-shaped limiting groove and restricting the longitudinal movement of the prefabricated bridge deck. At this time, the bent segment corresponding to the protruding reinforcing bar of the prefabricated bridge deck is exactly at the location of the shear stud. The shear stud acts as a lateral limiting rod to restrict the lateral movement of the bridge deck. Concrete is poured in the post-cast strip formed between the two prefabricated bridge decks to cast the prefabricated bridge deck and the tenon and mortise connector together, completing the assembly of the composite beam, improving construction efficiency and shortening the construction period.

[0038] Other advantages, objectives, and features of the invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination, or may be learned from practice of the invention. The objectives and other advantages of the invention can be realized and obtained through the following description. Attached Figure Description

[0039] To make the objectives, technical solutions, and advantages of the present invention clearer, the preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, wherein:

[0040] Figure 1 This is a schematic diagram of the detachable prefabricated closed-end profiled steel-concrete composite beam of the present invention. Figure 1 ;

[0041] Figure 2This is a schematic diagram of the detachable prefabricated closed-end profiled steel-concrete composite beam of the present invention. Figure 2 ;

[0042] Figure 3 This is a schematic diagram of the U-shaped closed profiled steel sheet in the detachable prefabricated closed profiled steel-concrete composite beam of the present invention. Figure 1 ;

[0043] Figure 4 This is a schematic diagram of the U-shaped closed profiled steel sheet in the detachable prefabricated closed profiled steel-concrete composite beam of the present invention. Figure 2 ;

[0044] Figure 5 This is a structural schematic diagram of the web concrete in the detachable prefabricated closed profiled steel-concrete composite beam of the present invention.

[0045] Figure 6 This is a structural schematic diagram of the tenon and mortise connector in the detachable prefabricated closed profiled steel-concrete composite beam of the present invention;

[0046] Figure 7 This is a bottom view of the tenon and mortise connector in the detachable prefabricated closed profiled steel-concrete composite beam of the present invention.

[0047] Figure 8 This is a schematic diagram of the connection between the web of the prefabricated steel-concrete composite structure and the tenon and mortise connector in the detachable prefabricated assembled closed profiled steel-concrete composite beam of the present invention.

[0048] Figure 9 This is a schematic diagram of the prefabricated bridge deck in the detachable prefabricated assembled closed profiled steel-concrete composite beam of the present invention;

[0049] Figure 10 This is a schematic diagram of the connection between the precast bridge deck and the tenon and mortise connector in the detachable precast assembled closed profiled steel-concrete composite beam of the present invention.

[0050] Figure reference numerals: 1. U-shaped closed profiled steel sheet; 2. Web concrete; 3. First vertical steel plate; 4. Flat steel plate; 5. Second vertical steel plate; 6. Shear stud; 7. Triangular reinforcing plate; 8. Upper groove area; 9. Lower groove area; 10. Precast bridge deck; 11. Outward reinforcing bar; 12. L-shaped limiting groove; 13. Bolt hole; 14. Bolt hole. Detailed Implementation

[0051] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0052] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual pictures. They should not be construed as limiting the invention. To better illustrate the embodiments of the invention, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product dimensions. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0053] In the accompanying drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components. In the description of the present invention, it should be understood that if terms such as "upper," "lower," "left," "right," "front," and "rear" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting the present invention. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0054] like Figure 1-10 The detachable prefabricated closed profiled steel-concrete composite beam shown includes a prefabricated steel-concrete composite structural web, tenon-and-mortise steel connectors inserted into the upper end of the prefabricated steel-concrete composite structural web, and a prefabricated bridge deck 10 used in conjunction with the tenon-and-mortise steel connectors.

[0055] The precast steel-concrete composite structure web includes a precast web structure formed by internal concrete pouring and a U-shaped closed profiled steel sheet 1 encasing the precast web structure. The entire closed profiled steel sheet is bent to form the U-shaped closed profiled steel sheet 1, which serves as the concrete pouring template for the precast web structure. Multiple bolt holes 13 are provided at the upper end of the U-shaped closed profiled steel sheet 1, and corresponding bolt holes 13 are pre-reserved at the upper end of the precast web structure. The bolt holes 14 facilitate the connection of the precast web structure and the U-shaped closed profiled steel sheet 1 into a whole by inserting high-strength bolts through the bolt holes 14 and bolt holes 13. The outer U-shaped closed profiled steel sheet 1 can delay the cracking of the concrete in the web and improve the load-bearing capacity of the web. At the same time, the inner wall of the profiled steel sheet has several closed ribs integrally formed along its length. Due to the presence of closed ribs in the profiled steel sheet, the interlocking between the profiled steel sheet and the concrete is increased, and the bonding strength between the two is improved.

[0056] The tenon-and-mortise steel connector includes a flat steel plate 4, two first vertical steel plates 3 located below the flat steel plate 4, and two second vertical steel plates 5 located above the flat steel plate 4.

[0057] Two first vertical steel plates 3 and the flat steel plate 4 between them form an inverted U-shaped recessed area 9. Holes matching the bolt holes 14 are provided on the first vertical steel plates 3 at positions corresponding to the bolt holes 14. The recessed area 9 is inserted into the upper end of the precast steel-concrete composite structure web and is connected to the precast steel-concrete composite structure web by high-strength bolts inserted into the holes 14 and 13 on the first vertical steel plates 3. The diameter of the holes is slightly larger than the diameter of the high-strength bolt rod, which facilitates the reinforcement connection of the high-strength bolts after insertion, realizing convenient connection between the tenon and mortise connector and the precast steel-concrete composite structure web, and achieving detachability.

[0058] Multiple triangular reinforcing plates 7 are welded and fixed at even intervals between the two first vertical steel plates 3 and the flat steel plate 4 on the side away from the lower groove area 9. The triangular reinforcing plates 7 improve the stability of the corner of the flat steel plate 4 and prevent corner instability when the prefabricated bridge deck 10 is connected to the tenon and mortise steel connector.

[0059] Two second vertical steel plates 5 and the flat steel plate 4 between them form a U-shaped upper groove area 8, which serves as a post-cast strip for the bridge deck concrete. Multiple shear nails 6 are uniformly welded in the upper groove area 8. Multiple L-shaped limiting grooves 12 with equal distances are opened on the two second vertical steel plates 5. The distance between the two second vertical steel plates 5 is greater than the distance between the two first vertical steel plates 3.

[0060] The precast bridge deck 10 has a crisscrossing steel mesh inside. At the ends of the precast bridge deck 10, the concrete is arranged in a two-tiered stepped shape. The transverse steel bars in the upper layer of concrete extend outwards from the steel mesh, with their ends bent horizontally to form U-shaped outward-extending steel bars 11. A distance is reserved between the U-shaped outward-extending steel bars 11 and the end concrete to prevent collision between the precast bridge deck 10 and the tenon-and-mortise steel connectors during assembly. This also facilitates the lateral backward movement of the precast bridge deck 10 and the positioning of the L-shaped limiting groove 12. Furthermore, the surface of the stepped concrete of the precast bridge deck 10 is roughened to ensure sufficient strength between the two precast bridge decks 10 and the post-cast concrete strip. The U-shaped outward-extending steel bars 11... The diameter should be slightly smaller than the width of the L-shaped limiting groove 12 on the second vertical steel plate 5 so that the U-shaped protruding steel bar 11 can pass smoothly through the L-shaped limiting groove 12 on the second vertical steel plate 5 and be accurately positioned. The length of the horizontal section of the U-shaped protruding steel bar 11 after bending should be less than the horizontal length before bending so that the horizontal section can be inserted into the previous L-shaped limiting groove 12 and longitudinally limit the horizontal section of the previous protruding steel bar 11. The bending radius of the protruding steel bar 11 should be greater than the diameter of the shear nail 6 to facilitate the lateral limiting adjustment after the precast bridge deck 10 and the tenon and mortise connector are inserted, so that the shear nail 6 on the tenon and mortise connector can act as a limiting rod to laterally limit the U-shaped protruding steel bar 11 and stabilize the splicing pre-connection of the precast bridge deck 10 and the tenon and mortise connector.

[0061] When the upper end of the tenon and mortise connector is connected to the two precast bridge deck panels 10, the protruding section of the U-shaped reinforcing bar 11 on one side of the precast bridge deck panel 10 is passed through the L-shaped limiting groove 12 of the second vertical steel plate 5. At the same time, the entire precast bridge deck panel 10 is moved slightly along the longitudinal direction of the bridge so that the horizontal section after the bending of the protruding reinforcing bar 11 corresponds to the previous L-shaped limiting groove 12. Then, the precast bridge deck panel 10 is moved laterally outward so that the U-shaped section of the protruding reinforcing bar 11 is inserted into the previous corresponding L-shaped limiting groove 12, fixing the protruding reinforcing bar 11 in the L-shaped limiting groove 12 and restricting the longitudinal movement of the precast bridge deck panel 10. At this time, the bending section corresponding to the protruding reinforcing bar 11 of the precast bridge deck panel 10 is exactly at the position of the shear nail 6. The shear nail 6 acts as a lateral limiting rod to restrict the lateral movement of the bridge deck panel. The connection between the precast bridge deck panel 10 on the other side and the tenon and mortise connector is completed according to the above steps.

[0062] A construction method for a detachable prefabricated closed-type profiled steel-concrete composite beam includes the following steps:

[0063] S1: In the engineering preparation of precast steel-concrete composite structure web, tenon and mortise steel connectors, and precast bridge deck 10, specifically:

[0064] S11: Bend the closed profiled steel sheet according to the design dimensions to form a U-shaped closed profiled steel sheet 1, and make bolt holes 13 at its end to make it a U-shaped casting template.

[0065] S12: Concrete is poured inside the U-shaped closed profiled steel sheet 1 to complete the preparation of the web of the precast steel-concrete composite structure;

[0066] S13: According to the design dimensions, holes are made in the first vertical steel plate 3, and L-shaped limiting grooves 12 with equal distances are made in the second vertical steel plate 5.

[0067] S14: The installation design dimensions are to weld the two first vertical steel plates 3 and the two second vertical steel plates 5 to the corresponding positions of the flat steel plate 4, and to evenly weld the shear nails 6 at the corresponding positions of the upper groove area 8 to complete the preparation of the tenon and mortise steel connector.

[0068] S15: Arrange the upper layer of steel mesh in the mold of the precast bridge deck 10, and bend the end steel bars to make them into U-shaped outward steel bars 11.

[0069] S16: Pour concrete into the mold, cure for a period of time, and then roughen the end surface to complete the preparation of the precast bridge deck 10.

[0070] S2: At the construction site, the precast steel-concrete composite structure web, tenon and mortise steel connectors, and precast bridge deck 10 are assembled to complete the assembly of the composite beam. Specifically:

[0071] S21: Hoist the tenon and tenon steel connectors so that the lower groove area 9 corresponds to the end of the precast steel-concrete composite structure web plate for insertion, and at the same time, match the opening positions between the two one by one, pass high-strength bolts through the openings, tighten high-strength nuts, and connect the two into a whole.

[0072] S22: Hoist a precast bridge deck 10 so that its U-shaped protruding steel bar 11 at the end corresponds to the L-shaped limiting groove 12 on the second vertical steel plate 5, so that the protruding steel bar 11 enters the bottom end of the L-shaped limiting groove 12. At this time, the bend of the protruding steel bar 11 also corresponds to the welded shear nail 6 on the tenon and mortise steel connector.

[0073] S23: Adjust the position of the precast bridge deck 10 and move it backward a short distance laterally so that the horizontal section of the extended steel bar 11 after bending enters the L-shaped limiting groove 12, which plays a longitudinal limiting role. At the same time, the bent part of the extended steel bar 11 just contacts the welded shear nail 6, which plays a lateral limiting role.

[0074] S24: Follow step S23 to complete the assembly of the other precast bridge deck 10 and the tenon and mortise steel connector;

[0075] S25: Concrete is poured into the post-cast strip formed between the two precast bridge decks 10 to cast the precast bridge decks 10 together with the tenon and mortise connectors, thus completing the assembly of the composite beam.

[0076] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A detachable prefabricated closed-type profiled steel-concrete composite beam, characterized in that, It includes a precast steel-concrete composite structure web, tenon-and-mortise steel connectors inserted into the upper part of the precast steel-concrete composite structure web, and a precast bridge deck that is used in conjunction with the tenon-and-mortise steel connectors. The precast steel-concrete composite structure web includes a precast web structure formed by internal concrete pouring and a U-shaped closed profiled steel sheet that encloses the precast web structure. The tenon-and-mortise steel connector includes a flat steel plate, two first vertical steel plates located at the lower part of the flat steel plate, and two second vertical steel plates located at the upper part of the flat steel plate. The two first vertical steel plates are inserted into the upper part of the web of the precast steel-concrete composite structure. Shear nails are uniformly welded on the flat steel plate between the two second vertical steel plates. Multiple L-shaped limiting grooves with equal distances are opened on the two second vertical steel plates. The precast bridge deck is internally arranged with a crisscrossing steel mesh. Extending steel bars are provided laterally along the edges of the precast bridge deck. The ends of these extending steel bars are bent to form U-shaped extending steel bars that cooperate with shear studs and L-shaped retaining grooves. The end concrete of the precast bridge deck is arranged in a two-layer stepped structure. The transverse steel bars in the steel mesh of the upper layer extend outwards, and their ends are bent horizontally to form U-shaped extending steel bars. The bent sections of the extending steel bars are fitted onto the locations of the shear studs. The diameter of the extending steel bars should be smaller than the width of the L-shaped retaining groove. The length of the horizontal section of the extending steel bar after bending is smaller than its original horizontal length. The bending radius of the extending steel bars is larger than the diameter of the welded shear studs. The upper end of the U-shaped closed profiled steel plate has multiple bolt holes, and bolt holes matching the bolt holes are reserved at the corresponding positions on the upper end of the precast web structure. The first vertical steel plate has holes matching the bolt holes at the corresponding positions. The two first vertical steel plates and the flat steel plate between them form an inverted U-shaped lower groove area. The lower groove area is inserted into the upper end of the precast steel-concrete composite structure web and is connected to the precast steel-concrete composite structure web by high-strength bolts inserted into the holes, bolt holes, and bolt holes on the first vertical steel plates. The two second vertical steel plates and the flat steel plate between them form a U-shaped upper groove area, which serves as the post-cast strip for the bridge deck concrete. Shear studs are evenly welded to the upper groove area. The distance between the two second vertical steel plates is greater than the distance between the two first vertical steel plates.

2. The detachable prefabricated closed-type profiled steel-concrete composite beam as described in claim 1, characterized in that, Multiple triangular reinforcing plates are welded and fixed at even intervals between the two first vertical steel plates and the flat steel plate on the side away from the lower groove area.

3. A construction method for a detachable prefabricated closed-type profiled steel-concrete composite beam as described in claim 1, characterized in that, Includes the following steps: S1: In the engineering fabrication of precast steel-concrete composite structure webs, tenon-and-mortise steel connectors, and precast bridge decks, specifically: S11: Bend the closed profiled steel sheet according to the design dimensions to form a U-shaped closed profiled steel sheet, and make bolt holes at its ends to make it a U-shaped casting template. S12: Concrete is poured inside the U-shaped closed profiled steel sheet to complete the preparation of the web of the precast steel-concrete composite structure; S13: According to the design dimensions, make holes in the first vertical steel plate and open equidistant L-shaped limiting grooves in the second vertical steel plate; S14: The installation design dimensions are to weld the two first vertical steel plates and the two second vertical steel plates to the corresponding positions of the flat steel plate, and to evenly weld shear nails to the corresponding positions in the upper groove area to complete the preparation of the tenon and mortise steel connector. S15: The upper layer of steel mesh is arranged in the mold of the precast bridge deck, and the end steel bars are bent to make them into U-shaped outward reinforcing bars. S16: Pour concrete into the mold, cure for a period of time, and then roughen the end surface to complete the preparation of the precast bridge deck. S2: At the construction site, the precast steel-concrete composite structure web, tenon-and-mortise steel connectors, and precast bridge deck are assembled to complete the assembly of the composite beam. Specifically: S21: Hoist the tenon and tenon steel connectors so that the lower groove area corresponds to the end of the precast steel-concrete composite structure web plate for insertion, and at the same time, align the opening positions between the two one by one, pass high-strength bolts through the openings, and tighten high-strength nuts to connect the two into a whole. S22: Hoist a precast bridge deck so that the U-shaped protruding steel bar at its end corresponds to the L-shaped limiting groove on the second vertical steel plate, so that the protruding steel bar enters the bottom of the L-shaped limiting groove. At this time, the bend of the protruding steel bar corresponds to the welded shear nail passing through the tenon and mortise steel connector. S23: Adjust the position of the precast bridge deck and move it laterally backward so that the horizontal section of the extended steel bar after bending enters the L-shaped limiting groove, which plays a longitudinal limiting role. At the same time, the bent part of the extended steel bar just contacts the welded shear stud, which plays a lateral limiting role. S24: Follow step S23 to complete the assembly of the other precast bridge deck and the tenon and mortise steel connector; S25: Concrete is poured into the post-cast strip formed between the two precast bridge decks to cast the precast bridge decks together with the tenon and mortise connectors, thus completing the assembly of the composite beam.

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