UHPC (Ultra High Performance Concrete) beam shear-resistant reinforcing structure and construction method thereof

Abstract

The invention relates to the technical field of UHPC beams, and discloses a UHPC beam shear-resistant reinforcing structure and a construction method thereof.The UHPC beam shear-resistant reinforcing structure comprises a steel structure and an ultra-high performance concrete structure poured on the steel structure later, at least two sets of shear-resistant rib plates are integrally formed on the top end face of the steel structure, and an upper row of connecting holes and a lower row of connecting holes are formed in the shear-resistant rib plates; a transverse reinforcing steel bar is inserted between the upper and lower pairs of connecting holes, the two ends of the transverse reinforcing steel bar penetrate through the upper and lower groups of connecting holes forming one pair respectively, and the end part of the transverse reinforcing steel bar is provided with an external thread and is in threaded connection with a fastening nut. According to the invention, the plurality of groups of transverse steel bars are fixedly connected with the anti-shearing rib plate, ribs of a reinforced structure are formed for pouring of the ultra-high performance concrete structure in the later period, the edge connection of the formed UHPC beam is firmer, and meanwhile, the anti-shearing rib plate additionally arranged on the steel structure is directly poured in the ultra-high performance concrete structure; therefore, the ultra-high performance concrete structure is not easy to separate and slide from the steel structure after being subjected to shear force, and the shear resistance of the UHPC beam is improved.

Description

Technical Field

[0001] The invention relates to the technical field of UHPC beams, and in particular to a UHPC beam shear reinforcement structure and a construction method thereof. Background Art

[0002] With the increasing demand for high-performance building materials in modern construction projects, Ultra-High Performance Concrete (UHPC) is increasingly used in structures such as bridges and buildings due to its excellent mechanical properties and durability. UHPC has extremely high compressive strength, tensile strength and shear resistance, and is particularly suitable for structural components that bear large loads and complex stress conditions. However, in practical applications, due to certain differences in the interfacial stress transfer between concrete and steel structures, interface slip or separation may occur when subjected to large shear forces, resulting in reduced overall structural performance. Therefore, in order to further improve the shear resistance of UHPC beams, how to effectively solve the connection problem between steel structures and UHPC concrete structures has become one of the research focuses in the engineering field.

[0003] The traditional UHPC beam shear reinforcement structure mainly relies on the longitudinal and transverse reinforcement arrangement, and the overall shear resistance of the beam is enhanced through the combined action of the reinforcement and concrete. For example, a UHPC prefabricated wall panel and its construction method disclosed in Chinese patent application number CN202410549794.0 belong to the field of prefabricated wall panel technology, including a UHPC wall and a sound insulation board arranged inside the UHPC wall, as well as transverse reinforcement, vertical reinforcement, positioning block, positioning seat, docking locking mechanism and support positioning mechanism.

[0004] However, due to the high brittleness of UHPC, simple steel bar arrangement is difficult to effectively solve the interface bonding problem between concrete and steel structure. Especially under the condition of large shear force, interface slip phenomenon is still difficult to avoid.

[0005] Therefore, we propose a UHPC beam shear reinforcement structure and its construction method. Summary of the invention

[0006] The present invention mainly solves the technical problems existing in the above-mentioned prior art and provides a UHPC beam shear reinforcement structure and a construction method thereof.

[0007] In order to achieve the above-mentioned purpose, the present invention provides the following technical scheme: a UHPC beam shear reinforcement structure, comprising a steel structure and an ultra-high performance concrete structure cast on the steel structure later, wherein the top surface of the steel structure is integrally provided with at least two groups of shear ribs, and the shear ribs are provided with upper and lower rows of connecting holes, and a transverse steel bar is inserted between two connecting holes in an upper and lower pair, and the two ends of the transverse steel bar respectively penetrate the upper and lower groups of connecting holes forming a pair, and the end of the transverse steel bar is provided with an external thread and is threadedly connected with a fastening nut, and a casting frame is also provided on the steel structure.

[0008] Preferably, the casting frame includes four groups of side panels and two groups of middle panels, the two groups of middle panels are rectangular panels and the upper and lower side walls are provided with middle limit holes at positions corresponding to the transverse steel bars, the middle limit holes are in contact with the transverse steel bars, the four side panels are divided into two left and right groups and the two side panels of the same group are symmetrically distributed on the upper and lower sides of the middle panel, the side panels are provided with side limit holes in contact with the transverse steel bars at positions corresponding to the transverse steel bars, the middle limit holes and the side limit holes form combined limit holes, the combined limit holes are wrapped around the side walls of the transverse steel bars, an end panel is also provided at the end between the two middle panels, the ends of the side panels and the middle panels are fixedly installed with hook connectors, the ends of the hook connectors are bent 90 degrees toward the center of the side panels to form an L-shaped structure, and the end panels are provided with hook connector grooves that can accommodate the ends of the hook connectors at positions corresponding to the hook connectors.

[0009] Preferably, the side panels, middle panels and end panels have the same thickness, and the thickness of the side panels is the same as the length of the bent portion of the transverse reinforcement protruding from the edge of the steel structure.

[0010] Preferably, reinforcement grooves are provided on the end surfaces of the connection holes on the two groups of shear ribs that are close to each other. The reinforcement grooves are truncated cone-shaped grooves. A reinforcement piece is embedded in the reinforcement grooves. The reinforcement piece is a truncated cone-shaped block. A threaded groove cooperating with the transverse steel bar is provided inside the reinforcement piece. The reinforcement piece can be threadedly connected to the transverse steel bar. The height of the reinforcement piece is two-thirds of the depth of the reinforcement groove. There is a gap between the top surface of the reinforcement piece and the top surface of the reinforcement groove. A plurality of groups of through hooks are evenly arranged on the inclined surface of the reinforcement piece, and the through hooks pass through the bottom surface and the top surface of the reinforcement piece.

[0011] Preferably, a fastener is threadedly connected to the transverse reinforcement, the front end face diameter of the fastener is twice the diameter of the bottom face of the reinforcement, and the rear end face of the fastener is provided with an avoidance groove, which is communicated with the through hook.

[0012] Preferably, multiple groups of reinforcing ribs are evenly welded to the end surfaces of the two groups of shear ribs close to each other, the reinforcing ribs are trapezoidal steel plates, and a gasket is sleeved between the fastening nut and the shear ribs.

[0013] Preferably, the connection holes on the shear ribs on the left and right sides are arranged alternately, and the ends of the transverse steel bars are arranged alternately.

[0014] Preferably, the connecting holes are obliquely opened on the shear ribs, and the connecting holes at corresponding positions on the left and right groups of shear ribs have the same inclination angle, so that the ends of the two groups of transverse steel bars connected at corresponding angles are connected along a dotted line, the symmetrical bending parts of the transverse steel bars on the left and right sides are not on the same plane as the vertical line of the shear ribs, and the ends of the transverse steel bars are staggered.

[0015] A construction method of a UHPC beam shear reinforcement structure is also provided, comprising the following steps:

[0016] S1: Screw the fastening nut onto the transverse reinforcement and then put a washer on it, then pass the transverse reinforcement through the connection hole, then put a washer on it and tighten the fastening nut. Use two sets of fastening nuts to fix and adjust the depth of the transverse reinforcement through the connection hole, so that the protrusion of the transverse reinforcement at the bend is the same as the length of the steel structure and the thickness of the side panel;

[0017] S2: After the middle panel is passed horizontally through the transverse reinforcement, it is vertically erected, and the middle limit hole is clamped on the transverse reinforcement. Then, two sets of side panels are symmetrically placed at the upper and lower ends of the middle panel, and the side limit holes on the side panels and the middle limit holes on the middle panel are used to wrap the transverse reinforcement, and the position of the side panels is fixed at the same time. Then, the two end panels are placed between the two middle panels, and the hook connection grooves on the end panels are aligned with the hook connection pieces for insertion, and the side panels, middle panels and end panels are surrounded by a rectangular frame;

[0018] S3: pouring UHPC to form an ultra-high performance concrete structure, and then removing the rectangular frame;

[0019] S4: Align the steel structures of the two groups of UHPC beams that have been cast, so that the transverse steel bars on the left side of one group of UHPC beams and the transverse steel bars on the right side of the other group of UHPC beams are staggered to form a clamping space, and then pass the connecting steel column through the clamping space and connect and cast again to form a continuous UHPC beam.

[0020] Beneficial Effects

[0021] The present invention provides a UHPC beam shear reinforcement structure and a construction method thereof, which has the following beneficial effects:

[0022] (1) The UHPC beam shear reinforcement structure and construction method thereof are characterized in that a plurality of groups of transverse steel bars are fixedly connected with the shear ribs to form ribs of the reinforcement structure for the subsequent pouring of the ultra-high performance concrete structure. The edge connection of the formed UHPC beam is more solid. At the same time, the shear ribs attached to the steel structure are directly poured into the ultra-high performance concrete structure, so that the ultra-high performance concrete structure is not easy to separate and slide from the steel structure after being subjected to shear force, thereby increasing the shear resistance of the UHPC beam.

[0023] (2) The UHPC beam shear reinforcement structure and its construction method, the obliquely staggered transverse steel bars and the reinforcing ribs welded on the inner side of the shear ribs can improve the overall strength of the ultra-high performance concrete structure within the ultra-high performance concrete structure.

[0024] (3) The UHPC beam shear reinforcement structure and its construction method, in order to quickly and conveniently cast, use detachable side panels, middle panels and end panels, place the middle panel horizontally through the bend of the transverse steel bars, let the middle panel be vertical so that the middle limit hole is supported between the transverse steel bars, and then place the two side panels on both sides of the middle panel on the upper and lower sides, and completely wrap the transverse steel bars through the side limit holes. At this time, the combined limit holes formed by the side panels and the middle panels are used in conjunction with the transverse steel bars to directly locate the positions of the side panels and the middle panels, and then the two end panels are placed between the two middle panels from the inside, and the hook grooves are aligned with the hook pieces and clamped. At this time, the side panels, the middle panels and the end panels form a rectangular frame, and then the UHPC is cast inside the rectangular frame, which can quickly locate the rectangular frame and reduce casting errors.

[0025] (4) The UHPC beam shear reinforcement structure and construction method thereof include a truncated cone-shaped reinforcement groove in the connection hole and a reinforcement piece that is threadedly connected to the transverse reinforcement and can be embedded in the reinforcement groove. The UHPC is able to flow through the hook and fill the space between the reinforcement groove and the reinforcement piece during pouring, thereby forming a reinforced structure and increasing the connection strength between the transverse reinforcement and the ultra-high performance concrete structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the implementation of the present invention or the technical solution in the prior art, the following is a brief introduction to the drawings required for the implementation or the prior art description. Obviously, the drawings described below are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0027] The structures, proportions, sizes, etc. illustrated in this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with the technology. They are not used to limit the conditions under which the present invention can be implemented, and therefore have no substantial technical significance. Any structural modification, change in proportion or adjustment of size shall still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0028] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0029] Figure 2 This is a schematic diagram of the structure after construction of the present invention;

[0030] Figure 3 It is a schematic diagram of the steel structure of the present invention;

[0031] Figure 4 This is a schematic diagram of the transverse reinforcement structure of the present invention;

[0032] Figure 5 It is a schematic diagram of the enclosure structure of the present invention;

[0033] Figure 6 The invention discloses a transverse steel bar reinforced connection structure.

[0034] Legend:

[0035] 1. Steel structure; 2. Ultra-high performance concrete structure; 3. Shear ribs; 4. Strengthening ribs; 5. Connection holes; 6. Transverse reinforcement; 7. Fastening nuts; 8. Gaskets; 9. Side panels; 10. Side limit holes; 11. Middle panels; 12. Middle limit holes; 13. Combined limit holes; 14. End panels; 15. Hooks; 16. Hook slots; 17. Reinforcement slots; 18. Reinforcement pieces; 19. Through hooks; 20. Fasteners; 21. Avoidance slots. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] UHPC beam shear reinforcement structure, such as Figure 1-Figure 5As shown, it includes a steel structure 1 and an ultra-high performance concrete structure 2 cast on the steel structure 1 later. The steel structure 1 is an I-shaped steel. The top surface of the steel structure 1 is integrally formed with at least two groups of shear ribs 3. The two groups of shear ribs 3 are symmetrically arranged on the steel structure 1. The shear ribs 3 are divided into upper and lower sides and symmetrically and evenly provided with a plurality of connection holes 5. A transverse steel bar 6 is inserted between the two connection holes 5 of the upper and lower pairs. The transverse steel bar 6 is a U-shaped steel bar. Both ends of the transverse steel bar 6 respectively penetrate the upper and lower groups of connection holes 5 forming a pair. The ends of the transverse steel bar 6 are provided with external threads and are threaded with fastening nuts 7. The multiple groups of transverse steel bars 6 are fixedly connected to the shear ribs 3 through the fastening nuts 7, so as to form ribs of the reinforced structure for the later casting of the ultra-high performance concrete structure 2. The formed UHPC beam edge connection is more solid. At the same time, the shear ribs 3 attached to the steel structure 1 are directly cast in the ultra-high performance concrete structure 2, so that the ultra-high performance concrete structure 2 is not easy to separate and slide from the steel structure 1 after being subjected to shear force, thereby increasing the shear resistance of the UHPC beam.

[0038] In some embodiments, the connection holes 5 on the left and right shear ribs 3 are staggered so that the transverse reinforcements 6 installed on the left and right connection holes 5 are staggered. When two groups of UHPC beams need to be connected, the ends of the transverse reinforcements 6 of the two groups of UHPC beams that can be staggered are overlapped to form a channel that can connect the two groups of UHPC beams. The connecting steel is inserted into the channel to combine the two groups of UHPC beams together.

[0039] In other embodiments, the connection holes 5 are obliquely opened on the shear ribs 3, and the connection holes 5 at corresponding positions on the left and right groups of shear ribs 3 have the same inclination angle, so that the ends of the two groups of transverse steel bars 6 connected at corresponding angles are connected along the dotted line, and the transverse steel bars 6 are obliquely staggered with the shear ribs 3, so that the bending parts of the symmetrical transverse steel bars 6 on the left and right sides are not on the same plane as the vertical line of the shear ribs 3. When the two groups of UHPC beams composed of the steel structure 1 and the ultra-high performance concrete structure 2 are fitted, the transverse steel bars 6 on the left and right sides of the UHPC beams can be staggered and crossed, thereby providing a space formed by the transverse steel bars 6 on the two groups of UHPC beams passing through the front of the UHPC beams to combine the two groups of UHPC beams together.

[0040] Multiple groups of reinforcing ribs 4 are evenly welded to the end surfaces of the two groups of shear ribs 3 that are close to each other. The reinforcing ribs 4 are trapezoidal steel plates, which enhance the stability of the shear ribs 3 and can also increase the shear resistance of the UHPC beam after being cast in the ultra-high performance concrete structure 2.

[0041] In order to increase the degree of fastening of the transverse reinforcement 6 on the shear rib 3, a gasket 8 is sleeved between the fastening nut 7 and the shear rib 3. When the transverse reinforcement 6 is tilted on the shear rib 3, the gasket 8 can also be tuned between the fastening nut 7 and the shear rib 3 to fill the angle between the fastening nut 7 and the shear rib 3 caused by the tilt of the transverse reinforcement 6.

[0042] In order to better carry out pouring, a pouring frame is also provided, which includes four groups of side panels 9 and two groups of middle panels 11. The two groups of middle panels 11 are rectangular panels and the upper and lower side walls are provided with middle limiting holes 12 corresponding to the positions of the transverse reinforcement 6, and the middle limiting holes 12 are in contact with the transverse reinforcement 6. The four side panels 9 are divided into two left and right groups and the two side panels 9 of the same group are symmetrically distributed on the upper and lower sides of the middle panel 11. The side panels 9 are provided with side limiting holes 10 in contact with the transverse reinforcement 6 at the positions corresponding to the transverse reinforcement 6. When the middle panel 11 and the two groups of side panels 9 are combined, the middle limiting holes 12 and the side limiting holes 10 form a combined limiting hole 13, and the combined limiting hole 13 is wrapped around the side wall of the transverse reinforcement 6. Furthermore, an end panel 14 is provided at the end between the two middle panels 11. The end panel 14 is a rectangular panel. The ends of the side panels 9 and the middle panel 11 are fixedly installed with hook connectors 15. The hook connector 15 is a rectangular block and the hook connector 1 The end of 5 is bent 90 degrees toward the center of the side panel 9 to form an L-shaped structure, and the end panel 14 is provided with a hooking groove 16 that can accommodate the end of the hooking piece 15 at the position corresponding to the hooking piece 15. When pouring, firstly, the middle panel 11 is horizontally placed to pass through the bending part of the transverse steel bar 6, so that the middle panel 11 is vertical so that the middle limit hole 12 is supported between the transverse steel bars 6, and then the two side panels 9 are placed on both sides of the middle panel 11 on the upper and lower sides, and the transverse steel bars 6 are completely wrapped by the side limit holes 10. At this time, the combined limit holes 13 formed by the side panels 9 and the middle panels 11 are used to cooperate with the transverse steel bars 6 to directly locate the positions of the side panels 9 and the middle panels 11, and then the two end panels 14 are placed between the two middle panels 11 from the inside, and the hooking groove 16 is aligned with the hooking piece 15, and clamped. At this time, the side panels 9, the middle panels 11 and the end panels 14 form a rectangular frame, and then the UHPC is poured inside the rectangular frame.

[0043] The side panels 9, the middle panels 11 and the end panels 14 have the same thickness, and the thickness is the same as the length of the bent portion of the transverse reinforcement 6 protruding from the edge of the steel structure 1, so that when the subsequent two groups of UHPC beams are combined, the transverse reinforcement 6 on one UHPC beam does not interfere with the ultra-high performance concrete structure 2 of the other UHPC beam.

[0044] In another embodiment, Figure 6As shown, the end surfaces of the connection holes 5 on the two groups of shear ribs 3 that are close to each other are provided with reinforcement grooves 17, which are truncated cone-shaped grooves, and a reinforcement piece 18 is embedded in the reinforcement groove 17, which is a truncated cone-shaped block, and a threaded groove cooperating with the transverse reinforcement 6 is provided inside the reinforcement piece 18, and the reinforcement piece 18 can be threadedly connected to the transverse reinforcement 6, and the height of the reinforcement piece 18 is two-thirds of the depth of the reinforcement groove 17, so that there is a gap between the top surface of the reinforcement piece 18 and the top surface of the reinforcement groove 17, and at the same time, a plurality of groups of through hooks 19 are evenly provided on the inclined surface of the reinforcement piece 18, and the through hooks 19 are rectangular grooves and pass through the bottom and top surfaces of the reinforcement piece 18. When pouring, UHPC flows from the through hooks 19 into the space between the reinforcement piece 18 and the reinforcement groove 17, further increasing the firmness of the transverse reinforcement 6 and the shear ribs 3, and increasing the shear resistance.

[0045] Furthermore, a fastener 20 is threadedly connected to the transverse reinforcement 6, and the front end face diameter of the fastener 20 is twice the bottom face diameter of the reinforcement 18. The rear end face of the fastener 20 is provided with an avoidance groove 21, and the avoidance groove 21 is communicated with the through hook 19. When the fastener 20 fastens the transverse reinforcement 6, the UHPC enters the through hook 19 from the avoidance groove 21.

[0046] The construction method of the UHPC beam shear reinforcement structure includes the following steps:

[0047] S: Screw the fastening nut 7 onto the transverse reinforcement 6 and then put a gasket 8 on it, then pass the transverse reinforcement 6 through the connecting hole 5, then put a gasket 8 on it and tighten the fastening nut 7. Use two sets of fastening nuts 7 to fix and adjust the depth of the transverse reinforcement 6 passing through the connecting hole 5, so that the protrusion of the bending part of the transverse reinforcement 6 is the same as the length of the steel structure 1 and the thickness of the side panel 9.

[0048] S: Pass the middle panel 11 horizontally through the transverse reinforcement 6 and then vertically, clamp the middle limit hole 12 on the transverse reinforcement 6, and then place the two sets of side panels 9 symmetrically at the upper and lower ends of the middle panel 11, use the side limit holes 10 on the side panels 9 and the middle limit holes 12 on the middle panel 11 to wrap the transverse reinforcement 6, and fix their own positions at the same time, and then place the two end panels 14 between the two middle panels 11, align the hooking grooves 16 on the end panels 14 with the hooking pieces 15 for insertion, and surround the side panels 9, the middle panels 11 and the end panels 14 into a rectangular frame.

[0049] The UHPC is poured to form an ultra-high performance concrete structure 2, and then the rectangular frame is removed.

[0050] The steel structures 1 of the two groups of UHPC beams that have been cast are aligned with each other, so that the transverse steel bars 6 on the left side of one group of UHPC beams and the transverse steel bars 6 on the right side of the other group of UHPC beams are staggered to form a clamping space, and then the connecting steel columns are passed through the clamping space and connected and cast again to form a continuous UHPC beam.

[0051] The working principle of the present invention is as follows: a plurality of groups of transverse steel bars 6 are fixedly connected to the shear ribs 3 to form ribs of the reinforcing structure for the later pouring of the ultra-high performance concrete structure 2, so that the edge connection of the formed UHPC beam is more solid. At the same time, the shear ribs 3 attached to the steel structure 1 are directly poured into the ultra-high performance concrete structure 2, so that the ultra-high performance concrete structure 2 is not easy to separate and slide from the steel structure 1 after being subjected to shear force, thereby increasing the shear resistance of the UHPC beam.

[0052] The obliquely staggered transverse reinforcements 6 and the reinforcing ribs 4 welded to the inner side of the shear ribs 3 can improve the overall strength of the ultra-high performance concrete structure 2 within the ultra-high performance concrete structure 2 .

[0053] In order to cast quickly and conveniently, detachable side panels 9, middle panels 11 and end panels 14 are used. The middle panel 11 is placed horizontally through the bending part of the transverse steel bars 6, and the middle panel 11 is vertically placed so that the middle limit hole 12 is supported between the transverse steel bars 6. Then, the two side panels 9 are placed on both sides of the middle panel 11 on the upper and lower sides, and the transverse steel bars 6 are completely wrapped by the side limit holes 10. At this time, the combined limit holes 13 formed by the side panels 9 and the middle panels 11 are used to cooperate with the transverse steel bars 6 to directly locate the positions of the side panels 9 and the middle panels 11. Then, the two end panels 14 are placed between the two middle panels 11 from the inside, and the hooking grooves 16 are aligned with the hooking pieces 15 and clamped. At this time, the side panels 9, the middle panels 11 and the end panels 14 form a rectangular frame. Then, UHPC is poured inside the rectangular frame, which can quickly locate the rectangular frame and reduce casting errors.

[0054] A truncated cone-shaped reinforcement groove 17 is provided in the connection hole 5, and a reinforcement piece 18 is threadedly connected to the transverse reinforcement 6 and can be embedded in the reinforcement groove 17. By utilizing a through hook 19 on the reinforcement piece 18, UHPC can flow through the through hook 19 and fill the space between the reinforcement groove 17 and the reinforcement piece 18 during pouring, thereby forming a reinforced structure and increasing the connection strength between the transverse reinforcement 6 and the ultra-high performance concrete structure 2.

[0055] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A UHPC beam shear reinforcement structure, comprising a steel structure (1) and an ultra-high performance concrete structure (2) cast on the steel structure (1) at a later stage, characterized in that: The top surface of the steel structure (1) is integrally formed with at least two groups of shear ribs (3), and the shear ribs (3) are provided with two upper and lower rows of connection holes (5). A transverse steel bar (6) is inserted between two upper and lower pairs of the connection holes (5), and the two ends of the transverse steel bar (6) respectively penetrate the upper and lower groups of connection holes (5) that form a pair. The end of the transverse steel bar (6) is provided with an external thread and is threadedly connected with a fastening nut (7). The steel structure (1) is also provided with a cast frame.

2. The UHPC beam shear reinforcement structure according to claim 1, characterized in that: The casting frame comprises four groups of side panels (9) and two groups of middle panels (11). The two groups of middle panels (11) are rectangular panels and the upper and lower side walls are provided with middle limit holes (12) at positions corresponding to the transverse reinforcement (6). The middle limit holes (12) are in contact with the transverse reinforcement (6). The four side panels (9) are divided into two groups on the left and right and the two side panels (9) in the same group are symmetrically distributed on the upper and lower sides of the middle panel (11). The side panels (9) are provided with side limit holes (10) in contact with the transverse reinforcement (6) at positions corresponding to the transverse reinforcement (6). The middle limit holes (12) are in contact with the transverse reinforcement (6). The positioning hole (12) and the side limiting hole (10) form a combined limiting hole (13), and the combined limiting hole (13) is wrapped around the side wall of the transverse steel bar (6). An end panel (14) is also provided at the end between the two middle panels (11). A hooking member (15) is fixedly installed at the end of the side panel (9) and the middle panel (11), and the end of the hooking member (15) is bent 90 degrees toward the center of the side panel (9) to form an L-shaped structure. A hooking groove (16) capable of accommodating the end of the hooking member (15) is provided at a position corresponding to the hooking member (15) on the end panel (14).

3. The UHPC beam shear reinforcement structure according to claim 2, characterized in that: The side panels (9), the middle panels (11) and the end panels (14) have the same thickness, and the thickness of the side panels (9) is the same as the length of the bent portion of the transverse steel bar (6) protruding from the edge of the steel structure (1).

4. The UHPC beam shear reinforcement structure according to claim 1, characterized in that: The end surfaces of the connection holes (5) on the two groups of shear ribs (3) close to each other are provided with reinforcement grooves (17), the reinforcement grooves (17) are truncated cone-shaped grooves, a reinforcement piece (18) is embedded in the reinforcement grooves (17), the reinforcement piece (18) is a truncated cone-shaped block, a thread groove matching with the transverse steel bar (6) is provided inside the reinforcement piece (18), the reinforcement piece (18) can be threadedly connected to the transverse steel bar (6), the height of the reinforcement piece (18) is two-thirds of the depth of the reinforcement groove (17), there is a gap between the top surface of the reinforcement piece (18) and the top surface of the reinforcement groove (17), and a plurality of groups of through hooks (19) are evenly provided on the inclined surface of the reinforcement piece (18), and the through hooks (19) penetrate the bottom surface and the top surface of the reinforcement piece (18).

5. The UHPC beam shear reinforcement structure according to claim 4, characterized in that: A fastener (20) is threadedly connected to the transverse reinforcement (6), the front end face diameter of the fastener (20) is twice the bottom face diameter of the reinforcement (18), and the rear end face of the fastener (20) is provided with an escape groove (21), and the escape groove (21) is communicated with the through hook (19).

6. The UHPC beam shear reinforcement structure according to any one of claims 1 to 5, characterized in that: A plurality of reinforcing ribs (4) are uniformly welded to the end surfaces of the two groups of shear ribs (3) close to each other. The reinforcing ribs (4) are trapezoidal steel plates. A gasket (8) is sleeved between the fastening nut (7) and the shear ribs (3).

7. The UHPC beam shear reinforcement structure according to any one of claims 1 to 5, characterized in that: The connection holes (5) on the shear ribs (3) on the left and right sides are arranged in a staggered manner, and the ends of the transverse steel bars (6) are arranged in a staggered manner.

8. The UHPC beam shear reinforcement structure according to any one of claims 1 to 5, characterized in that: The connection holes (5) are obliquely opened on the shear ribs (3); the connection holes (5) at corresponding positions on the left and right groups of the shear ribs (3) have the same inclination angle, so that the ends of the two groups of transverse steel bars (6) connected at corresponding angles are connected along a dotted line; the bending parts of the transverse steel bars (6) symmetrical on the left and right sides are not on the same plane as the vertical line of the shear ribs (3); and the ends of the transverse steel bars (6) are staggered.

9. The construction method of the UHPC beam shear reinforcement structure is characterized in that: The following steps are involved: S1: Screw the fastening nut (7) onto the transverse reinforcement (6) and then insert a gasket (8), then insert the transverse reinforcement (6) through the connection hole (5), then insert a gasket (8) and tighten the fastening nut (7), and adjust the depth of the transverse reinforcement (6) passing through the connection hole (5) by fixing with two sets of fastening nuts (7), so that the length of the transverse reinforcement (6) protruding from the bending part to the steel structure (1) is the same as the thickness of the side panel (9); S2: The middle panel (11) is passed horizontally through the transverse reinforcement (6) and then vertically, and the middle limit hole (12) is clamped on the transverse reinforcement (6), and then two sets of side panels (9) are placed symmetrically at the upper and lower ends of the middle panel (11), and the side limit holes (10) on the side panels (9) and the middle limit holes (12) on the middle panel (11) are used to wrap the transverse reinforcement (6), and the position of the side panels (14) is fixed at the same time, and then the two end panels (14) are placed between the two middle panels (11), and the hooking grooves (16) on the end panels (14) are aligned with the hooking pieces (15) for insertion, and the side panels (9), the middle panel (11) and the end panels (14) are surrounded by a rectangular frame; S3: pouring UHPC to form an ultra-high performance concrete structure (2), and then removing the rectangular frame; S4: Align the steel structures (1) of the two groups of UHPC beams that have been cast, so that the transverse steel bars (6) on the left side of one group of UHPC beams and the transverse steel bars (6) on the right side of the other group of UHPC beams are interlaced to form a clamping space, and then the connecting steel column passes through the clamping space and is connected and cast again to form a continuous UHPC beam.

Images