Connection structure of box-type UHPC chord member and steel web members, and construction method therefor

Abstract

Disclosed in the present invention are a connection structure of a box-type UHPC chord member and steel web members, and a construction method therefor. The connection structure comprises a box-type UHPC chord member using a reinforced UHPC structure, a compression web member, and a tension web member; the box-type UHPC chord member, the compression web member, and the tension web member are connected to form a K-shaped gusset connection structure; the box-type UHPC chord member is provided with a gusset plate; a T-shaped perforated steel plate group connected to the gusset plate is provided inside the box-type UHPC chord member; T-shaped perforated steel plates in the T-shaped perforated steel plate group are combined with steel bars in the box-type UHPC chord member to form a PBL connector; the gusset plate is provided with a plurality of high-strength bolts; and the T-shaped perforated steel plate on the tension web member side is further provided with a plurality of first studs. The connection structure of the box-type UHPC chord member and the steel web members has excellent bearing capacity, shearing resistance and drawing resistance.

Description

A connection structure of box-shaped UHPC chord and steel web and its construction method Technical Field

[0001] The present invention relates to the technical field of bridge engineering, and in particular to a connection structure of a box-shaped UHPC chord and a steel web and a construction method thereof. Background Art

[0002] Steel-reinforced concrete composite truss bridges (such as steel tube concrete arch bridges and steel-concrete composite truss beam bridges) offer advantages such as light weight, high structural efficiency, and strong spanning capacity, and are often considered a strong alternative for long-span bridge structures. For these composite truss bridges, a reliable connection (K-shaped joint) between the web members and the upper and lower chords is key to ensuring the overall mechanical performance of the structure. For steel tube concrete arch bridges and steel truss web member-rigid skeleton concrete composite arch bridges, the K-shaped joints are welded connections between the steel web members and the steel chord tubes, which are filled or encased with concrete; the concrete is not directly connected to the steel web members.

[0003] At present, for K-shaped nodes that directly connect steel and concrete, a single bolt or PBL connection form is usually used, and it is generally for the connection between steel and ordinary concrete. At the same time, the bearing capacity of existing connection forms is generally low. Compared with ordinary concrete, UHPC has ultra-high mechanical properties, and its cross-sectional dimensions can often be made smaller and thinner. For extra-large span steel-UHPC composite truss arch bridges or beam bridges, the K-shaped node is a combined structure in which the steel web and the UHPC chord are directly connected. The node may bear huge axial pressure from the chord and huge tensile and compressive loads on the steel web, and the force is complex. The chord usually adopts a box section because it has high bending stiffness and cross-sectional utilization. Taking into account the differences in materials and structural forms, it is necessary to develop a connection structure that can be applied to the K-shaped node of the box-shaped UHPC chord and the steel web.

[0004] Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a box-shaped UHPC chord and steel web connection structure with excellent bearing capacity, shear resistance and pull-out resistance, and a construction method thereof.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] A connection structure of a box-shaped UHPC chord and a steel web, comprising a box-shaped UHPC chord, a compression web and a tension web, wherein the box-shaped UHPC chord, the compression web and the tension web are connected to form a K-shaped node connection structure, the box-shaped UHPC chord is a reinforced UHPC structure, the box-shaped UHPC chord is provided with a node plate for connecting with the compression web and the tension web, the node plate portion is pre-embedded inside the box-shaped UHPC chord, the box-shaped UHPC chord is provided with a T-shaped perforated steel plate group connected to the node plate, the T-shaped perforated steel plates in the T-shaped perforated steel plate group cooperate with the steel bars in the box-shaped UHPC chord to form a PBL connector, the node plate is provided with a plurality of high-strength bolts for connecting the T-shaped perforated steel plate on the tension web side and the node plate, and the T-shaped perforated steel plate on the tension web side is also provided with a plurality of first bolts located inside the box-shaped UHPC chord.

[0008] As a further improvement of the above technical solution:

[0009] The T-shaped perforated steel plates in the T-shaped perforated steel plate group include longitudinal T-shaped perforated steel plates extending along the length direction of the box-shaped UHPC chord and transverse T-shaped perforated steel plates arranged perpendicular to the longitudinal T-shaped perforated steel plates.

[0010] The longitudinal T-shaped perforated steel plate and the transverse T-shaped perforated steel plate form a closed annular structure.

[0011] The node plate includes an embedded steel plate embedded in the box-shaped UHPC chord, one side of the embedded steel plate coincides with the outer surface of the box-shaped UHPC chord, each of the high-strength bolts passes through the transverse T-shaped perforated steel plate on the tension web side and is connected to the embedded steel plate, and the first stud is connected to the transverse T-shaped perforated steel plate on the tension web side.

[0012] The embedded steel plate is provided with a plurality of second bolts located inside the box-shaped UHPC chord.

[0013] The T-shaped perforated steel plate in the T-shaped perforated steel plate group is composed of a perforated plate and a connecting plate. The connecting plate is connected to the perforated plate to form a T-shaped structure. The node plate includes a plurality of connecting steel plates connected to the embedded steel plate. The compression web and the tension web are connected to the corresponding connecting steel plates. The perforated plates in the longitudinal T-shaped perforated steel plate and the perforated plates in the transverse T-shaped perforated steel plate on the tension web side and the corresponding connecting steel plates are a whole plate structure. A plurality of elongated holes for the perforated plates to pass through are correspondingly provided on the embedded steel plate. The perforated plates are welded to the embedded steel plates through the elongated holes.

[0014] The transverse T-shaped perforated steel plate on the compression web side is directly welded to the embedded steel plate.

[0015] The node plate includes two connecting parts for connecting the compression web and the tension web respectively. The connecting parts are located at one end of the connecting steel plate away from the embedded steel plate. The compression web and the tension web are connected to the corresponding connecting parts by welding or bolting.

[0016] The steel bars in the box-shaped UHPC chord include longitudinal steel bars and stirrups, which cooperate with the T-shaped perforated steel plates in the T-shaped perforated steel plate group to form a PBL connector. The K-shaped node area where the box-shaped UHPC chord is connected to the compression web and the tension web is set as a thickened section or a solid section.

[0017] As a general inventive concept, another aspect of the present invention provides a construction method for the above-mentioned box-shaped UHPC chord and steel web connection structure, comprising the following steps:

[0018] S1: precast compression webs, tension webs, gusset plates, T-shaped perforated steel plates, high-strength bolts, first and second studs;

[0019] S2: The gusset plate, T-shaped perforated steel plate group, high-strength bolts, first studs and second studs are assembled into an integral structure by welding and bolting;

[0020] S3: Tie the steel mesh, set up the formwork, fix the assembled overall structure in the preset position, and cast the UHPC to form a box-shaped UHPC chord;

[0021] S4: Connect the compression web members and tension web members to the gusset plate respectively by welding or bolting.

[0022] Compared with the prior art, the advantages of the present invention are: the connection structure of the box-shaped UHPC chord and the steel web of the present invention can increase the connection strength of the T-shaped perforated steel plate and the node plate due to the high strength of the high-strength bolts, enhance the pull-out bearing capacity of the T-shaped perforated steel plate, and at the same time expand the anchoring area of ​​the T-shaped perforated steel plate, so that more UHPC can participate in the load, significantly reduce the amount of disengagement of the node plate from the box-shaped UHPC chord under the action of tension, and improve the pull-out stiffness; the provision of a first bolt on the T-shaped perforated steel plate can increase the anchoring depth of the T-shaped perforated steel plate, further enhance the pull-out performance of the T-shaped perforated steel plate and the node plate; the connection structure of the box-shaped UHPC chord and the steel web adopts a hybrid connector form of perforated steel plate, PBL connector, first bolt and high-strength bolt, and the advantages of various connectors are combined with each other to fully improve the connection efficiency, bearing capacity, shear resistance and pull-out stiffness of the node, and has excellent bearing capacity, shear resistance, pull-out resistance and high structural efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a schematic diagram of the overall structure of the connection structure of the box-shaped UHPC chord and the steel web.

[0024] Figure 2 is a schematic diagram of the elevation structure of the box-shaped UHPC chord.

[0025] FIG3 is a schematic diagram of a partial three-dimensional structure of a gusset plate.

[0026] FIG4 is a schematic diagram of the top view of the embedded steel plate.

[0027] FIG5 is a schematic diagram of the three-dimensional structure of the perforated steel plate group connected with the high-strength bolts.

[0028] FIG6 is a schematic diagram of the three-dimensional structure of the connection between the longitudinal T-shaped perforated steel plate and the gusset plate.

[0029] FIG7 is a schematic diagram of the three-dimensional structure of the connection between the transverse T-shaped perforated steel plate and the gusset plate.

[0030] Legend: 1. Box-shaped UHPC chord; 11. Longitudinal reinforcement; 12. Stirrups; 2. Compression web; 3. Tension web; 4. Node plate; 41. Embedded steel plate; 411. Longitudinal hole; 42. Connecting steel plate; 5. T-shaped perforated steel plate group; 51. Longitudinal T-shaped perforated steel plate; 52. Transverse T-shaped perforated steel plate; 6. High-strength bolt; 7. First stud; 8. Second stud. DETAILED DESCRIPTION

[0031] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0032] As shown in Figures 1 to 7, the connection structure of the box-shaped UHPC chord and the steel web in this embodiment includes a box-shaped UHPC chord 1, a compression web 2 and a tension web 3. The box-shaped UHPC chord 1, the compression web 2 and the tension web 3 are connected to form a K-shaped node connection structure. The box-shaped UHPC chord 1 is a reinforced UHPC structure. A node plate 4 for connecting with the compression web 2 and the tension web 3 is provided on the box-shaped UHPC chord 1. The node plate 4 is partially embedded in the box-shaped UHPC chord. 1, which can improve the shear resistance of the node plate 4. A T-shaped perforated steel plate group 5 connected to the node plate 4 is provided inside the box-shaped UHPC chord 1. The T-shaped perforated steel plates in the T-shaped perforated steel plate group 5 cooperate with the steel bars in the box-shaped UHPC chord 1 to form a PBL connector. The node plate 4 is provided with a plurality of high-strength bolts 6 for connecting the T-shaped perforated steel plates on the side of the tension web 3 and the node plate 4. Due to the high strength of the high-strength bolts 6, the connection strength between the T-shaped perforated steel plates and the node plate 4 can be increased, thereby improving the The pull-out bearing capacity of the T-shaped perforated steel plate is enhanced, and the anchoring area of ​​the T-shaped perforated steel plate can be expanded, so that more UHPC can participate in the load, significantly reducing the amount of separation between the node plate 4 and the box-shaped UHPC chord 1 under tension, and improving the pull-out stiffness. The T-shaped perforated steel plate on the side of the tension web 3 is also provided with a plurality of first bolts 7 located inside the box-shaped UHPC chord 1. The PBL connector has high stiffness, but it will block the continuity of the fiber over a large area. Combined with the arrangement of the first bolts 7, it can be not seriously This affects the continuity of the fibers and can save a certain amount of steel. Providing a first bolt 7 on the T-shaped perforated steel plate can increase the anchoring depth of the T-shaped perforated steel plate and further enhance the pull-out resistance of the T-shaped perforated steel plate and the node plate 4. The connection structure of the box-shaped UHPC chord and the steel web adopts a hybrid connection form of the T-shaped perforated steel plate, PBL connector, first bolt 7, and high-strength bolt 6. The advantages of various connectors are combined to achieve excellent load-bearing capacity, shear resistance, and pull-out stiffness. The connection structure of the box-shaped UHPC chord and the steel web also improves the connection efficiency. Preferably, the compression web 2 and the tension web 3 both adopt a box-shaped section with a cross-sectional size of 500mm×400mm and a wall thickness of 14mm, and are connected to the node plate 4 by welding. Specifically, the length and width of the box-shaped UHPC chord 1 section are both 1220mm, and the diameter of the hollow circle inside the section is 900mm.

[0033] In this embodiment, the T-shaped perforated steel plates in the T-shaped perforated steel plate group 5 include longitudinal T-shaped perforated steel plates 51 extending along the length of the box-shaped UHPC chord 1 and transverse T-shaped perforated steel plates 52 arranged perpendicular to the longitudinal T-shaped perforated steel plates 51. Because the compressive force of the compression web 2 and the tensile force of the tension web 3 create an additional bending moment in the K-shaped node region, the gusset plate 4 experiences greater stress at both longitudinal ends, leading to more concentrated stress. Arranging the T-shaped perforated steel plates perpendicular to the length of the box-shaped UHPC chord 1 increases the efficiency of the transverse T-shaped perforated steel plates 52 in resisting bending moments, thereby improving structural efficiency. Furthermore, the longitudinal T-shaped perforated steel plates 51 arranged along the length of the box-shaped UHPC chord 1 strengthen the connection between the compression web 2 and the tension web 3, balancing a portion of the tensile and compressive loads on the compression web 2 and the tension web 3, thereby reducing the tensile and compressive loads directly borne by the box-shaped UHPC chord 1.

[0034] In this embodiment, the longitudinal T-shaped perforated steel plate 51 and the transverse T-shaped perforated steel plate 52 form a closed annular structure. Arranging the longitudinal T-shaped perforated steel plate 51 and the transverse T-shaped perforated steel plate 52 as a single unit can improve stress resistance. Preferably, the longitudinal T-shaped perforated steel plate 51 and the transverse T-shaped perforated steel plate 52 are welded together at the intersection.

[0035] In this embodiment, the gusset plate 4 includes an embedded steel plate 41 embedded within the box-shaped UHPC chord 1, enhancing the shear resistance of the embedded steel plate 41. One side of the embedded steel plate 41 overlaps the outer surface of the box-shaped UHPC chord 1. Each high-strength bolt 6 passes through a transverse T-shaped perforated steel plate 52 on the tension web 3 side and connects to the embedded steel plate 41. Positioning the high-strength bolt 6 in the transverse T-shaped perforated steel plate 52 on the tension web 3 side enhances the pullout resistance and stiffness of the tension web 3 side. A first bolt 7 is attached to the transverse T-shaped perforated steel plate 52 on the tension web 3 side. Positioning the first bolt 7 in the transverse T-shaped perforated steel plate 52 on the tension web 3 side increases the anchorage depth and strengthens the pullout resistance of the tension web 3 side. Specifically, the embedded steel plate 41 is 1400 mm long, 800 mm wide, and 30 mm thick. The embedded steel plate 41 is also provided with bolt holes for the high-strength bolts 6 to pass through. The thickness of the T-shaped perforated steel plate is 25 mm and the height is 250 mm. The diameter of the first bolt 7 and the second bolt 8 is 25 mm and the height is 250 mm. The diameter of the high-strength bolt 6 is 24 mm.

[0036] In this embodiment, the embedded steel plate 41 is provided with a plurality of second bolts 8 located within the box-shaped UHPC chord 1. Because the non-T-shaped opening steel plate area is not directly subjected to stress and bears a relatively small load, providing the second bolts 8 on the embedded steel plate 41 can save steel and ensure good continuity of the steel fibers.

[0037] In this embodiment, the T-shaped perforated steel plate in the T-shaped perforated steel plate group 5 is composed of a perforated plate and a connecting plate, and the connecting plate is connected to the perforated plate to form a T-shaped structure. The node plate 4 includes a plurality of connecting steel plates 42 connected to the embedded steel plate 41, and the compression web 2 and the tension web 3 are connected to the corresponding connecting steel plates 42. The perforated plate in the longitudinal T-shaped perforated steel plate 51 and the perforated plate in the transverse T-shaped perforated steel plate 52 on the side of the tension web 3 and the corresponding connecting steel plate 42 are a whole plate structure, that is, the perforated plate in the transverse T-shaped perforated steel plate 52 on the side of the tension web 3 and the corresponding connecting steel plate 42 are the same. A single steel plate. The perforated plate in the longitudinal T-shaped perforated steel plate 51 and the corresponding connecting steel plate 42 are the same steel plate, forming a single plate structure. This provides improved integrity and fatigue resistance, and allows the web member's tensile and compressive loads to be directly transferred to the box-shaped UHPC chord 1 through the T-shaped perforated steel plate. This results in a short transfer path and high efficiency. The embedded steel plate 41 is provided with a plurality of elongated holes 411 for the perforated plate to pass through. The perforated plate passes through the elongated holes 411 and is welded to the embedded steel plate 41. The entire plate passes through the elongated holes 411 and is welded to the embedded steel plate 41, providing further reinforcement. The transverse T-shaped perforated steel plate 52 on the side of the tension web 3 is the transverse T-shaped perforated steel plate 52 on the side closest to the tension web 3.

[0038] In this embodiment, the transverse T-shaped perforated steel plate 52 on the side of the compressive web 2 is directly welded to the embedded steel plate 41. Since the side of the compressive web 2 is in a compressive state, there is no fatigue problem. Therefore, the transverse T-shaped perforated steel plate 52 on the side of the compressive web 2 can be directly welded to the embedded steel plate 41, which can reduce the processing steps and reduce the difficulty of construction. Optionally, the perforated plate in the transverse T-shaped perforated steel plate 52 on the side of the compressive web 2 and the corresponding connecting steel plate 42 are the same steel plate, and the perforated plate is welded to the embedded steel plate 41 after passing through the elongated hole 411. The transverse T-shaped perforated steel plate 52 on the side of the compressive web 2 is the transverse T-shaped perforated steel plate 52 close to the side of the compressive web 2. Preferably, the perforated plate in the T-shaped perforated steel plate is arranged perpendicular to the embedded steel plate 41. Since the perforated plate and the connecting steel plate 42 are a whole plate structure, when the compression web 2, the tension web 3 and the embedded steel plate 41 are not at 90°, that is, when the whole plate structure and the embedded steel plate 41 are not at 90°, the whole plate structure is bent at the long strip hole 411 to ensure that the part of the whole plate structure located in the box-shaped UHPC chord 1 is arranged perpendicular to the embedded steel plate 41, that is, to ensure that the perforated plate and the embedded steel plate 41 are arranged perpendicularly.

[0039] In this embodiment, the gusset plate 4 includes two connecting portions for respectively connecting the compression web members 2 and the tension web members 3. These connecting portions are located at the end of the connecting steel plate 42 that is distal to the embedded steel plate 41. The compression web members 2 and the tension web members 3 are connected to the corresponding connecting portions by welding or bolting. Because the closer the connecting steel plate 42 is to the embedded steel plate 41, the greater the stress on the connecting steel plate 42, connecting the compression web members 2 and the tension web members 3 to the corresponding connecting portions creates a low-stress area, thereby achieving better fatigue performance.

[0040] In this embodiment, the reinforcement in the box-shaped UHPC chord 1 includes longitudinal reinforcement 11 and stirrups 12. Both longitudinal reinforcement 11 and stirrups 12 cooperate with the T-shaped perforated steel plates in the T-shaped perforated steel plate group 5 to form a PBL connector. The K-shaped joint region connecting the box-shaped UHPC chord 1 to the compression web 2 and the tension web 3 is configured as a thickened or solid section. The box-shaped UHPC chord 1 is constructed of UHPC with a box-shaped cross-section. Due to the high strength of UHPC, the cross-section of the box-shaped UHPC chord 1 can be made smaller and thinner. Because the K-shaped joint region concentrates forces and the box-shaped UHPC chord 1 has a thin cross-section, the longitudinal reinforcement 11 and stirrups 12 provided in the box-shaped UHPC chord 1, along with the K-shaped joint region configured as a thickened or solid section, facilitates the connection and arrangement of the perforated steel plates, high-strength bolts 6, and first and second studs 7, 8. Specifically, a 1500mm long solid section is provided in the K-shaped joint region.

[0041] The construction method of the connection structure of the box-shaped UHPC chord and the steel web in this embodiment includes the following steps:

[0042] S1: prefabricated compression web 2, tension web 3, gusset plate 4, T-shaped perforated steel plate group 5, high-strength bolts 6, first stud 7 and second stud 8;

[0043] S2: Assemble the gusset plate 4, the T-shaped perforated steel plate group 5, the high-strength bolts 6, the first studs 7 and the second studs 8 into an integral structure by welding and bolting;

[0044] S3: Tie the steel mesh, set up the formwork, fix the assembled overall structure in the preset position, and cast the UHPC to form the box-shaped UHPC chord 1;

[0045] S4: Connect the compression web members 2 and the tension web members 3 to the gusset plate 4, respectively, by welding or bolting. If the compression web members 2 and the tension web members 3 are connected to the gusset plate 4 first, the steel web members will inhibit the shrinkage of the UHPC during curing, posing a risk of cracking. In this embodiment, the upper and lower box-shaped UHPC chords 1 are connected to the steel web members after curing is completed, effectively avoiding the risk of cracking and ensuring construction reliability.

[0046] The above is only a preferred embodiment of the present invention, and the scope of protection of the present invention is not limited to the above embodiment. For those skilled in the art, improvements and modifications obtained without departing from the technical concept of the present invention should also be considered as the scope of protection of the present invention.

Claims

1. A connection structure of a box-shaped UHPC chord and a steel web, comprising a box-shaped UHPC chord (1), a compression web (2) and a tension web (3), wherein the box-shaped UHPC chord (1), the compression web (2) and the tension web (3) are connected to form a K-shaped node connection structure, wherein the box-shaped UHPC chord (1) is a reinforced UHPC structure, and is characterized in that: The box-shaped UHPC chord (1) is provided with a node plate (4) for connecting with a compression web (2) and a tension web (3); the node plate (4) is partially embedded in the box-shaped UHPC chord (1); a T-shaped perforated steel plate group (5) connected with the node plate (4) is provided in the box-shaped UHPC chord (1); the T-shaped perforated steel plates in the T-shaped perforated steel plate group (5) cooperate with the steel bars in the box-shaped UHPC chord (1) to form a PBL connector; the node plate (4) is provided with a plurality of high-strength bolts (6) for connecting the T-shaped perforated steel plate on the tension web (3) side and the node plate (4); and the T-shaped perforated steel plate on the tension web (3) side is also provided with a plurality of first bolts (7) located in the box-shaped UHPC chord (1).

2. The connection structure of the box-shaped UHPC chord and the steel web according to claim 1 is characterized in that: The T-shaped perforated steel plates in the T-shaped perforated steel plate group (5) include a longitudinal T-shaped perforated steel plate (51) extending along the length direction of the box-shaped UHPC chord (1) and a transverse T-shaped perforated steel plate (52) arranged perpendicular to the longitudinal T-shaped perforated steel plate (51).

3. The connection structure of the box-shaped UHPC chord and the steel web according to claim 2 is characterized in that: The longitudinal T-shaped perforated steel plate (51) and the transverse T-shaped perforated steel plate (52) form a closed annular structure.

4. The connection structure of the box-shaped UHPC chord and the steel web according to claim 3 is characterized in that: The node plate (4) includes an embedded steel plate (41) embedded in the box-shaped UHPC chord (1), one side of the embedded steel plate (41) coincides with the outer surface of the box-shaped UHPC chord (1), each of the high-strength bolts (6) passes through a transverse T-shaped perforated steel plate (52) on the tension web member (3) side and is connected to the embedded steel plate (41), and the first stud (7) is connected to the transverse T-shaped perforated steel plate (52) on the tension web member (3) side.

5. The connection structure of the box-shaped UHPC chord and the steel web according to claim 4 is characterized in that: The embedded steel plate (41) is provided with a plurality of second bolts (8) located inside the box-shaped UHPC chord (1).

6. The connection structure of the box-shaped UHPC chord and the steel web according to claim 5 is characterized in that: The T-shaped perforated steel plates in the T-shaped perforated steel plate group (5) are composed of perforated plates and connecting plates, and the connecting plates are connected to the perforated plates to form a T-shaped structure. The node plate (4) includes a plurality of connecting steel plates (42) connected to the embedded steel plates (41). The compression webs (2) and the tension webs (3) are connected to the corresponding connecting steel plates (42). The perforated plates in the longitudinal T-shaped perforated steel plates (51) and the perforated plates in the transverse T-shaped perforated steel plates (52) on the side of the tension webs (3) are a whole plate structure with the corresponding connecting steel plates (42). The embedded steel plates (41) are correspondingly provided with a plurality of elongated holes (411) for the perforated plates to pass through, and the perforated plates are welded to the embedded steel plates (41) through the elongated holes (411).

7. The connection structure of the box-shaped UHPC chord and the steel web according to claim 6 is characterized in that: The transverse T-shaped perforated steel plate (52) on the side of the compression web member (2) is directly connected to the embedded steel plate (41) by welding.

8. The connection structure of the box-shaped UHPC chord and the steel web according to claim 6, characterized in that: The node plate (4) comprises two connection parts for respectively connecting the compression web member (2) and the tension web member (3), wherein the connection parts are located at one end of the connecting steel plate (42) away from the embedded steel plate (41), and the compression web member (2) and the tension web member (3) are connected to the corresponding connection parts by welding or bolting.

9. The connection structure of a box-shaped UHPC chord and a steel web according to any one of claims 1 to 8, characterized in that: The steel bars in the box-shaped UHPC chord (1) include longitudinal steel bars (11) and stirrups (12), and the longitudinal steel bars (11) and stirrups (12) cooperate with the T-shaped perforated steel plates in the T-shaped perforated steel plate group (5) to form a PBL connector. The K-shaped node area where the box-shaped UHPC chord (1) is connected to the compression web member (2) and the tension web member (3) is set as a thickened section or a solid section.

10. A construction method for a connection structure of a box-shaped UHPC chord and a steel web, applied to the connection structure of a box-shaped UHPC chord and a steel web as claimed in any one of claims 1 to 9, characterized in that: The following steps are involved: S1: prefabricated compression web members (2), tension web members (3), node plates (4), T-shaped perforated steel plate groups (5), high-strength bolts (6), first studs (7) and second studs (8); S2: By means of welding and bolting, the node plate (4), the T-shaped perforated steel plate group (5), the high-strength bolts (6), the first bolts (7) and the second bolts (8) are assembled into an integral structure; S3: tying the steel mesh, setting up the formwork, fixing the assembled overall structure at a preset position, and pouring UHPC to form a box-shaped UHPC chord (1); S4: The compression web member (2) and the tension web member (3) are respectively connected to the node plate (4) by welding or bolting.

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