Prefabricated UHPC guardrail panel and construction method

Abstract

The invention provides a prefabricated UHPC guardrail panel and a construction method, and belongs to the technical field of road safety protection. The prefabricated UHPC guardrail panel comprises a plurality of supporting frames, and the supporting frames are fixed to a mounting surface; a guardrail panel is connected between every two adjacent supporting frames and comprises a vehicle facing panel and a vehicle back panel which are connected to the two sides of the supporting frames respectively. Every two adjacent guardrail panels are connected through a tensioning assembly. A traditional metal panel is replaced by the UHPC guardrail panel, the UHPC guardrail panel has the advantages of being high in strength, excellent in impact resistance and the like, the safety is improved, and meanwhile the UHPC guardrail panel has the advantages of being light in weight and convenient to hoist, so that the construction efficiency can be improved during construction.

Description

Technical Field

[0001] The present invention belongs to the technical field of road safety protection, and in particular relates to a prefabricated UHPC guardrail panel and a construction method. Background Art

[0002] The construction of anti-collision guardrails is mainly based on traffic safety considerations. With the rapid development of highway and bridge construction, the role of anti-collision guardrails has become increasingly prominent. It can not only prevent vehicles from running out of control and running off the road, but also provide necessary buffering and guidance when vehicles collide, thereby effectively reducing the damage caused by the accident. Therefore, the construction technology of anti-collision guardrails occupies an important position in traffic engineering.

[0003] At present, traditional SS-level anti-collision guardrails are mostly cast on site, with a long construction period and high cost. In addition, the appearance of the guardrail has quality problems such as pitted holes, uneven linearity, misalignment, and cracks. The existing functional gradient anti-collision guardrail proposed in the application publication number CN111877229A includes a base, an energy dissipation layer and a UHPC panel. The energy dissipation layer is arranged between the base and the UHPC panel. The functional gradient anti-collision guardrail has the advantages of good guidance, reduced accident consequences, good durability, low cost, short construction period, etc., and has great use value and good economic benefits, but there are still the following shortcomings: 1. Compared with on-site casting, there is a tendency for gaps to exist between adjacent panels and between the panels and the installation surface of the prefabricated UHPC panels of the guardrail after hoisting, which can easily cause leakage during casting and affect the strength of the anti-collision guardrail.

[0004] 2. During installation, the lateral adjustment range of the guardrail panel is limited, which can easily cause deviations and affect the strength of the guardrail panel. Summary of the invention

[0005] In order to solve the above problems existing in the prior art, a prefabricated UHPC guardrail panel and a construction method are proposed.

[0006] The technical solution for solving the technical problem of the present invention is as follows: on the one hand, a prefabricated UHPC guardrail panel is proposed, comprising a plurality of support frames, which are fixed on a mounting surface; a guardrail panel is connected between two adjacent support frames, and the guardrail panel comprises a vehicle-facing panel and a vehicle-rearward panel, which are respectively connected to both sides of the support frames; and two adjacent guardrail panels are connected by a tensioning assembly.

[0007] Preferably, the tensioning assembly includes a plug-in plate, which is L-shaped and has plug-in grooves at both ends of the top of the corresponding guardrail panel, the plug-in plate is inserted into the plug-in groove, and a tensioning hole is provided on the plug-in plate; it also includes a horizontal plate, both ends of which are vertically connected to vertical rods, the horizontal plate and the vertical rod form a U-shaped structure, and the outer wall of the vertical rod is threaded; the outer wall of the vertical rod is also fixed with an inclined block, the inclined block has an inclined surface, the small end of the inclined block is at the bottom, and the large end is at the top; the two inclined blocks are symmetrically arranged; a sleeve is also sleeved on the outside of the vertical rod, and a notch is provided on the wall of the sleeve, and the inclined block can move relatively along the notch; the top end of the sleeve is supported on the bottom of the plug-in plate; the vertical rod is threadedly connected with a fastening nut; when the fastening nut is screwed, the fastening nut squeezes the sleeve, and the inclined block moves downward to pull the two adjacent guardrail panels together.

[0008] Preferably, the tightening hole includes an arc segment and a rectangular segment, the arc radius of the arc segment is the same as the radius of the vertical rod, the width of the rectangular segment is the same as the width of the inclined block, and the length of the rectangular segment is less than the length of the inclined block, so that the inclined surface of the inclined block can be pressed on the farthest end of the rectangular segment.

[0009] Preferably, the support frame includes two groups of brackets arranged in parallel, forming a trapezoidal shape that is narrow at the top and wide at the bottom; a number of hanging groove plates are connected along the sides of the support frame, and hooks are connected to the inner sides of the vehicle-facing panel and the vehicle-rear panel respectively, and the hooks are hung on the hanging groove plates to realize the connection between the support frame and the guardrail panel; the bottom of the support frame is connected to the base, and a fixing hole is provided on the base, and the anchor bolts are fixed to the mounting surface and pass through the fixing holes, and the fixing nuts are threadedly connected to the anchor bolts and pressed to fix the base.

[0010] Preferably, the fixing hole is an elliptical hole, and the lateral position of the support frame is adjusted through the fixing hole of the base.

[0011] Preferably, the expansion joint template is detachably connected between two adjacent guardrail panels; a limit groove is formed between the two brackets of the support frame, a limit rod is connected to the inner side of the expansion joint template, the limit rod is mounted on the hanging groove plate and the end of the limit rod is extended into the limit groove, and the guardrail panels on both sides of the expansion joint template are clamped by a tensioning assembly.

[0012] Preferably, a height adjustment component is also provided between the bottom of the base and the mounting surface, the height adjustment component includes a bottom plate, a sliding groove is provided on the bottom plate, a top block is slidably connected in the sliding groove, and a first inclined surface is provided on the top of the top block; a telescopic block is provided on the top of the bottom plate, and the bottoms of both ends of the telescopic block are connected to guide rods, and guide grooves are provided on the corresponding bottom plates, and the guide rods cooperate with the guide grooves to realize vertical sliding of the telescopic block; a second inclined surface is provided on the ground of the telescopic block, and the first inclined surface cooperates with the second inclined surface so that the top block can drive the telescopic block to move vertically when it moves horizontally; one end of the top block is rotatably connected to a threaded rod, and a threaded hole is provided on the inner wall of the corresponding sliding groove, and the threaded rod passes through the threaded hole, and rotating the threaded rod can drive the top block to slide along the sliding groove.

[0013] Preferably, foam glue is filled between the bottom of the front vehicle panel and the rear vehicle panel and the installation surface.

[0014] On the other hand, the present invention also proposes a construction method using the prefabricated UHPC guardrail panel, comprising the following steps: S1. Layout measurement; according to the measurement results, set the top elevation positioning marks of the guardrail panel every several meters on the top surface of the guardrail reinforcement, and set the elevation positioning hanging line along the marks; pop up the support frame edge line according to the layout point, which serves as the support frame installation control line; S2. Installation surface treatment: clean the bridge deck and adjust and straighten the embedded steel bars and steel cages; S3. Install the support frame; according to the support frame installation control line, drill holes on the installation surface, insert the anchor bolts, align the fixing holes of the support frame with the inserted anchor bolts, and place a height adjustment device between the base and the installation surface. Use the height adjustment device to adjust the support frame to the height of the elevation positioning hanging line in S1, and then adjust the lateral position of the support frame through the elliptical fixing holes in the base so that both sides of the support frame are flush with the installation control line. Finally, tighten the fixing nuts to fix the support frame; S4. Positioning and installation of the back panel: hoist the back panel, hang the hook on the support frame, and after all the hooks are inserted into the slots, slowly lower them at a 45° angle until the back panel is completely inserted into the hooks; S5. Positioning and installation of the car-welcoming panel: hoist the car-welcoming panel, hang the hooks on the support frame, and after all the hooks are inserted into the slots, slowly lower them at a 45° angle until the car-welcoming panel is completely inserted into the hooks; S6. Installation of expansion joint template: Place the expansion joint template between two adjacent guardrail panels and place the limit rod of the expansion joint template in the limit groove; S7. Connection and sealing of guardrail panels; after inserting the plug-in board into the plug-in slot on the guardrail panel, insert the vertical rod into the tightening hole, and put the sleeve on the vertical rod, install the fastening nut, and finally tighten the two fastening nuts at the same time. The fastening nut squeezes the sleeve upward to press the bottom of the plug-in board, driving the inclined block to tighten the two adjacent guardrail panels downward and clamp the expansion joint template between the two guardrail panels to complete the sealing of the two adjacent guardrail panels; then fill the bottom gap of the guardrail panel with foam glue to ensure that the bottom and side are sealed without leakage; S8. Elevation review: After all guardrail panels are installed and sealed, use a level to review the elevation of the top surface of the anti-collision guardrail again.

[0015] S9. Concrete pouring: The guardrail concrete is poured in one go using a concrete tank truck in conjunction with a chute, and is compacted using an inserted vibrator; S10. Disassembly of auxiliary parts: When the concrete strength is higher than 75%, first loosen the fastening nut and disassemble the tensioning assembly; then pull out the expansion joint template parallel to the outside and fill the groove created by the limit rod; S11. Guardrail maintenance: The guardrail maintenance time shall not be less than 7 days, and the concrete surface shall be kept moist during the maintenance period.

[0016] Compared with the prior art, the above technical solution has the following advantages or beneficial effects: 1. The present invention uses UHPC guardrail panels instead of traditional metal panels. UHPC guardrail panels have the advantages of high strength and excellent impact resistance. While improving safety, they are also light in weight and easy to hoist, which can improve construction efficiency during construction.

[0017] 2. The present invention realizes a tight connection between two adjacent guardrail panels through a tensioning assembly. The two panels can be tightened more by rotating the fastening bolts, and the construction is convenient. At the same time, the tensioning assembly can be disassembled after pouring, which not only reduces the cost but also ensures the aesthetics of the guardrail panels. In addition, after the two guardrail panels are tightened, foam glue is filled at the bottom of the guardrail panels to ensure that there is no leakage during pouring.

[0018] 3. The present invention sets an expansion joint template between two adjacent guardrail panels so that it is stuck in the limiting groove of the support frame, thereby realizing the prefabrication of the expansion joint without the need for manual cutting of the expansion joint after the casting is completed, and can also limit the guardrail panel to ensure the relative position between the guardrail panel and the support frame.

[0019] 4. The present invention realizes the height adjustment of the support frame through the height adjustment component, so that the height of the support frame can be fine-tuned according to the elevation positioning hanging line to ensure the accuracy of the construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0021] Figure 1 It is a structural schematic diagram of the present invention.

[0022] Figure 2 It is a structural schematic diagram of a single set of UHPC guardrail panels.

[0023] Figure 3 It is a structural diagram of the guardrail panel.

[0024] Figure 4 It is a structural diagram of the expansion joint formwork.

[0025] Figure 5It is a structural diagram of the support frame.

[0026] Figure 6 It is a structural schematic diagram of the tensioning component.

[0027] Figure 7 It is a schematic diagram of the structure of the sleeve.

[0028] Figure 8 It is a structural schematic diagram of the height adjustment component.

[0029] Fig. 9 is a side cutaway view of the height adjustment assembly.

[0030] Description of reference numerals: 1. Installation surface; 2. Support frame; 21. Bracket; 22. Hanging groove plate; 23. Base; 24. Fixing hole; 25. Limiting groove; 3. Guardrail panel; 31. Car rear panel; 32. Car front panel; 33. Plug-in plate; 34. Tightening hole; 341. Arc section; 342. Rectangular section; 35. Hook; 36. Plug-in groove; 4. Tightening assembly; 41. Cross plate; 42. Vertical rod; 43. Sleeve; 44. Fastening nut; 45. Oblique block; 46. Notch; 5. Anchor bolt; 6. Fixing nut; 7. Expansion joint template; 71. Limiting rod; 8. Height adjustment assembly; 81. Bottom plate; 82. Sliding groove; 83. Top block; 84. Threaded rod; 85. First inclined surface; 86. Second inclined surface; 87. Telescopic block; 88. Guide rod; 89. Guide groove; 810. Threaded hole. DETAILED DESCRIPTION

[0031] In order to clearly illustrate the technical features of the present solution, the present invention is described in detail below through specific implementation methods and in combination with the accompanying drawings. The disclosure below provides many different embodiments or examples for realizing different structures of the present invention. In order to simplify the disclosure of the present invention, the components and settings of specific examples are described below. In addition, the present invention may repeat reference numbers and / or letters in different examples. This repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed. It should be noted that the components illustrated in the accompanying drawings are not necessarily drawn to scale. The present invention omits the description of known components and processing technologies and processes to avoid unnecessary limitations on the present invention. The orientation or position relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", and "third" are used only for descriptive purposes and cannot be understood as indicating or implying relative importance. In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] First, the size and shape of the UHPC guardrail panel 3 are designed: According to the current SS-level guardrail structure of highways, a new type of prefabricated lattice guardrail panel 3 is designed. Each section is 2.0m long, with a plate thickness of 12mm. The inner side is provided with longitudinal and transverse ribs, with a rib plate thickness of 37mm, a width of 60mm, and a 45° chamfer. The vertical rib spacing is (470+500+500+470)mm, the horizontal rib spacing of the front panel 32 is (385+350+350)mm, and the horizontal rib spacing of the rear panel 31 is (385+350+350+300)mm. Hooks 35 are set at the intersection of the ribs, and the embedded steel plate of hook 35 is made of -3×40×40mm stainless galvanized steel plate; the end of the guardrail panel 3 is made of L20×3 angle steel to make support frame 2 for installing and fixing UHPC guardrail panel 3, and the longitudinal spacing of support frame 2 is 2.0m. L20×3mm angle steel hanging groove and hook 35 are set at the support frame 2 corresponding to the intersection of the ribs, and ordinary hooks 35 at other rib intersections are connected to the longitudinal steel bars of the guardrail to jointly bear the concrete side pressure and vibration load during the concrete pouring process.

[0033] Embodiment 1: See also Figure 1-Figure 9 Based on the guardrail panel 3 of the above structure, this embodiment proposes a prefabricated UHPC guardrail panel, including a plurality of support frames 2, the support frames 2 are fixed on the mounting surface 1; the guardrail panel 3 is connected between two adjacent support frames 2, the guardrail panel 3 includes a front panel 32 and a rear panel 31, which are respectively connected to the two sides of the support frames 2; the adjacent guardrail panels 3 are connected by a tensioning assembly 4.

[0034] In order to achieve the tightening of adjacent guardrail surfaces to ensure that there is no slurry running or leaking, a tensioning assembly 4 is designed in this embodiment, including a plug-in plate 33, the plug-in plate 33 is L-shaped, and plug-in grooves 36 are provided at both ends of the top of the corresponding guardrail panel 3, the plug-in plate 33 is inserted into the plug-in groove 36, and a tightening hole 34 is provided on the plug-in plate 33; it also includes a horizontal plate 41, and the two ends of the horizontal plate 41 are respectively vertically connected to vertical rods 42, the horizontal plate 41 and the vertical rod 42 form a U-shaped structure, and the outer wall of the vertical rod 42 is provided with a thread; the outer wall of the vertical rod 42 is also fixed with There is an inclined block 45, which has an inclined surface, with the small end of the inclined block 45 at the bottom and the large end at the top; the two inclined blocks 45 are symmetrically arranged; a sleeve 43 is also sleeved on the outside of the vertical rod 42, and a notch 46 is opened on the wall of the sleeve 43, and the inclined block 45 can move relatively along the notch 46; the top of the sleeve 43 is supported on the bottom of the plug-in board 33; the vertical rod 42 is threadedly connected with a fastening nut 44; when the fastening nut 44 is screwed, the fastening nut 44 squeezes the sleeve 43, and the inclined block 45 moves down to pull the two adjacent guardrail panels 3 together. Foam glue is filled between the bottom of the front panel 32 and the rear panel 31 and the installation surface 1.

[0035] Directions: After the guardrail panels 3 are hoisted, the vertical rods 42 are respectively inserted into the plug-in grooves 36 of the plug-in plates 33 of the two adjacent guardrail panels 3, the sleeve 43 is put on from bottom to top, and the sleeve 43 is pushed up to the bottom of the plug-in plate 33 along the inclined surface, and finally the fastening bolts are screwed in to make the vertical rods 42 move downward continuously, driving the cross plate 41 and the inclined block 45 to continuously tighten the adjacent guardrail panels 3 to complete the sealing, and finally the sealant is injected into the bottom to complete the overall tightening and sealing.

[0036] In order to cooperate with the inclined block 45, the tightening hole 34 of this embodiment includes an arc segment 341 and a rectangular segment 342. The arc radius of the arc segment 341 is the same as the radius of the vertical rod 42, the width of the rectangular segment 342 is the same as the width of the inclined block 45, and the length of the rectangular segment 342 is less than the length of the inclined block 45, so that the inclined surface of the inclined block 45 can be pressed on the farthest end of the rectangular segment 342.

[0037] Embodiment 2: Continue reading Figure 1-Figure 9On the basis of the first embodiment, in some cases, the mounting surface 1 is not completely flat, so the support frame 2 needs to be adjusted up and down and left and right. Therefore, the support frame 2 of this embodiment includes two sets of brackets 21 arranged in parallel, which are in the shape of a trapezoid with narrow upper part and wide lower part; the two sides of the support frame 2 are connected with a plurality of hanging groove plates 22 along the side, and the inner sides of the vehicle-facing panel 32 and the vehicle-rearwarding panel 31 are respectively connected with hooks 35, and the hooks 35 are hung on the hanging groove plates 22 to realize the connection between the support frame 2 and the guardrail panel 3; the bottom of the support frame 2 is connected with the base 23, and the base 23 is provided with a fixing hole 24, and the anchor bolt 5 is fixed on the mounting surface 1 and passes through the fixing hole 24, and the fixing nut 6 is threadedly connected to the anchor bolt 5 and pressed to fix the base 23. The fixing hole 24 is an elliptical hole, and the lateral position of the support frame 2 is adjusted through the fixing hole 24 of the base 23.

[0038] A height adjustment component 8 is also provided between the bottom of the base 23 and the mounting surface 1. The height adjustment component 8 includes a bottom plate 81, a sliding groove 82 is provided on the bottom plate 81, a top block 83 is slidably connected in the sliding groove 82, and a first inclined surface 85 is provided on the top of the top block 83; a telescopic block 87 is provided on the top of the bottom plate 81, and the bottoms of both ends of the telescopic block 87 are connected to guide rods 88, and the corresponding guide grooves 89 are provided on the corresponding bottom plate 81, and the guide rods 88 cooperate with the guide grooves 89 to realize the vertical sliding of the telescopic block 87; a second inclined surface 86 is provided on the ground of the telescopic block 87, and the first inclined surface 85 cooperates with the second inclined surface 86 to enable the top block 83 to drive the telescopic block 87 to move vertically when it moves horizontally; one end of the top block 83 is rotatably connected to the threaded rod 84, and a threaded hole 810 is provided on the inner wall of the corresponding sliding groove 82, and the threaded rod 84 passes through the threaded hole 810, and rotating the threaded rod 84 can drive the top block 83 to slide along the sliding groove 82.

[0039] Embodiment three: Continue to refer to Figure - Fig. 9 In order to facilitate the positioning of the guardrail panel 3 and the opening of the expansion joint, the present embodiment is based on the second embodiment, and a detachable expansion joint template 7 is connected between two adjacent guardrail panels 3; a limiting groove 25 is formed between the two brackets 21 of the support frame 2, and a limiting rod 71 is connected to the inner side of the expansion joint template 7, and the limiting rod 71 is mounted on the hanging groove plate 22 and the end of the limiting rod 71 extends into the limiting groove 25, and the guardrail panels 3 on both sides of the expansion joint template 7 clamp the expansion joint template 7 through the tensioning assembly 4. During installation, the expansion joint template 7 is clamped in the limiting groove 25, and two adjacent guardrail panels 3 are arranged on both sides, and are clamped by the tensioning assembly 4, which can not only realize the positioning of the guardrail panel 3, but also prefabricate the expansion joint in advance, without the need to process the expansion joint after pouring, and reduce the construction steps.

[0040] Embodiment 2: Continue reading Figure 1-Figure 9In this embodiment, a construction method using the prefabricated UHPC guardrail panel 3 is proposed, comprising the following steps: S1. Lofting measurement; according to the measurement results, the top elevation positioning mark of the guardrail panel 3 is set every several meters on the top surface of the guardrail reinforcement, and the elevation positioning hanging line is set along the mark; according to the lofting point, the edge line of the support frame 2 is popped up as the control line for the installation of the support frame 2; S2. Treatment of installation surface 1: clean the bridge deck and adjust and straighten the embedded steel bars and steel cage; S3. Install the support frame 2; according to the installation control line of the support frame 2, drill holes in the installation surface 1, insert the anchor bolts 5, and then align the fixing holes 24 of the support frame 2 and insert the anchor bolts 5, and place a height adjustment device between the base 23 and the installation surface 1, and adjust the support frame 2 to the height of the elevation positioning hanging line in S1 through the height adjustment device, and then adjust the lateral position of the support frame 2 through the elliptical fixing holes 24 of the base 23, so that both sides of the support frame 2 are flush with the installation control line, and finally tighten the fixing nuts 6 to fix the support frame 2; S4 positioning and installation of the back panel 31; the back panel 31 is hoisted, the hook 35 is hung on the support frame 2, all hooks 35 are inserted into the notch 46 and then slowly lowered at 45 ° until the back panel 31 is completely inserted into the hook 35; S5. Positioning and installation of the welcoming panel 32; the welcoming panel 32 is hoisted, the hook 35 is hung on the support frame 2, all the hooks 35 are inserted into the notch 46 and then slowly lowered at 45° until the welcoming panel 32 is completely inserted into the hook 35; S6 installation of the expansion joint template 7; between the two adjacent guardrail panels 3, the expansion joint template 7 is placed, the expansion joint template 7 limit rod 71 frame limit groove 25; S7. Connection and sealing of the guardrail panel 3; after inserting the plug-in plate 33 into the plug-in slot 36 on the guardrail panel 3, insert the vertical rod 42 into the tightening hole 34, and sleeve 43 on the vertical rod 42, install the fastening nut 44, and finally tighten the two fastening nuts 44 at the same time, the fastening nut 44 squeezes the sleeve 43 to press the bottom of the plug-in plate 33 upward, driving the inclined block 45 to tighten the two adjacent guardrail panels 3 downward and clamp the expansion joint template 7 between the two guardrail panels 3, completing the sealing of the two adjacent guardrail panels 3; then fill the bottom gap of the guardrail panel 3 with foam glue to ensure that the bottom and side are sealed without leakage; S8. Elevation review: After all guardrail panels 3 are installed and sealed, use a level to review the elevation of the top surface of the anti-collision guardrail again.

[0041] S9. Concrete pouring: The guardrail concrete is poured in one go using a concrete tank truck in conjunction with a chute, and is compacted using an inserted vibrator; S10. Disassembly of auxiliary parts; when the concrete strength is higher than 75%, first loosen the fastening nut 44, remove the tensioning assembly 4; then pull out the expansion joint template 7 in parallel and fill the groove generated by the stop rod 71; S11. Guardrail maintenance: The guardrail maintenance time shall not be less than 7 days, and the concrete surface shall be kept moist during the maintenance period.

[0042] Although the above describes the specific implementation mode of the invention in conjunction with the drawings, it is not intended to limit the scope of protection of the invention. Based on the technical solution of the present invention, various modifications or variations that can be made by those skilled in the art without creative work are still within the scope of protection of the present invention.

Claims

1. A prefabricated UHPC guardrail panel, characterized in that: The invention comprises a plurality of support frames (2), wherein the support frames (2) are fixed on a mounting surface (1); a guardrail panel (3) is connected between two adjacent support frames (2), and the guardrail panel (3) comprises a vehicle-facing panel (32) and a vehicle-rearward panel (31), which are respectively connected to two sides of the support frames (2); and the adjacent guardrail panels (3) are connected via a tensioning assembly (4).

2. A prefabricated UHPC guardrail panel according to claim 1, characterized in that: The tensioning assembly (4) comprises a plug-in plate (33), the plug-in plate (33) is L-shaped, and has plug-in grooves (36) at both ends of the top of the corresponding guardrail panel (3), the plug-in plate (33) is inserted into the plug-in grooves (36), and the plug-in plate (33) is provided with a tensioning hole (34); it also comprises a horizontal plate (41), the two ends of the horizontal plate (41) are respectively vertically connected to the vertical rods (42), the horizontal plate (41) and the vertical rods (42) form a U-shaped structure, and the outer wall of the vertical rods (42) is provided with a thread; the outer wall of the vertical rods (42) is also fixedly provided with an inclined block (45), the inclined block (45) has an inclined surface, and the inclined block (45) The small end of the vertical rod (42) is at the bottom and the large end is at the top; the two inclined blocks (45) are symmetrically arranged; a sleeve (43) is also sleeved on the outside of the vertical rod (42), and a notch (46) is opened on the wall of the sleeve (43), and the inclined block (45) can move relatively along the notch (46); the top end of the sleeve (43) is supported on the bottom of the plug-in board (33); the vertical rod (42) is threadedly connected with a fastening nut (44); when the fastening nut (44) is screwed, the fastening nut (44) squeezes the sleeve (43), and the inclined block (45) moves downward to pull the two adjacent guardrail panels (3) together.

3. The prefabricated UHPC guardrail panel according to claim 1, characterized in that: The tensioning hole (34) comprises an arc segment (341) and a rectangular segment (342); the arc radius of the arc segment (341) is the same as the radius of the vertical rod (42); the width of the rectangular segment (342) is the same as the width of the inclined block (45); the length of the rectangular segment (342) is less than the length of the inclined block (45), so that the inclined surface of the inclined block (45) can be pressed against the farthest end of the rectangular segment (342).

4. The prefabricated UHPC guardrail panel according to claim 1, characterized in that: The support frame (2) comprises two sets of brackets (21) arranged in parallel, and presenting a trapezoidal shape with a narrow upper part and a wide lower part; a plurality of hanging groove plates (22) are connected along the side surfaces of the two sides of the support frame (2); hooks (35) are connected to the inner sides of the vehicle-facing panel (32) and the vehicle-rearward panel (31) respectively; the hooks (35) are hung on the hanging groove plates (22) to realize the connection between the support frame (2) and the guardrail panel (3); the bottom of the support frame (2) is connected to the base (23); a fixing hole (24) is provided on the base (23); an anchor bolt (5) is fixed on the mounting surface (1) and passes through the fixing hole (24); a fixing nut (6) is threadedly connected to the anchor bolt (5) and pressed to fix the base (23).

5. A prefabricated UHPC guardrail panel according to claim 4, characterized in that: The fixing hole (24) is an elliptical hole, and the lateral position of the support frame (2) is adjusted through the fixing hole (24) of the base (23).

6. The prefabricated UHPC guardrail panel according to claim 4, characterized in that: An expansion joint template (7) is detachably connected between two adjacent guardrail panels (3); a limiting groove (25) is formed between two brackets (21) of the support frame (2); a limiting rod (71) is connected to the inner side of the expansion joint template (7); the limiting rod (71) is mounted on the hanging groove plate (22) and the end of the limiting rod (71) extends into the limiting groove (25); the guardrail panels (3) on both sides of the expansion joint template (7) clamp the expansion joint template (7) through the tensioning assembly (4).

7. The prefabricated UHPC guardrail panel according to claim 4, characterized in that: A height adjustment component (8) is further provided between the bottom of the base (23) and the mounting surface (1), the height adjustment component (8) comprising a bottom plate (81), a sliding groove (82) being provided on the bottom plate (81), a top block (83) being slidably connected in the sliding groove (82), and a first inclined surface (85) being provided on the top of the top block (83); a telescopic block (87) being provided on the top of the bottom plate (81), the bottoms of both ends of the telescopic block (87) being connected to guide rods (88), corresponding guide grooves (89) being provided on the corresponding bottom plate (81), and the guide rods (88) and the guide grooves (89) being matched. The telescopic block (87) is combined to realize vertical sliding of the telescopic block (87); a second inclined surface (86) is provided on the ground of the telescopic block (87); the first inclined surface (85) cooperates with the second inclined surface (86) so that the top block (83) can drive the telescopic block (87) to move vertically when it moves horizontally; one end of the top block (83) is rotatably connected to the threaded rod (84), and a threaded hole (810) is provided on the inner wall of the corresponding sliding groove (82); the threaded rod (84) passes through the threaded hole (810), and the rotation of the threaded rod (84) can drive the top block (83) to slide along the sliding groove (82).

8. The prefabricated UHPC guardrail panel according to claim 1, characterized in that: Foam glue is applied between the bottom of the front vehicle panel (32) and the rear vehicle panel (31) and the mounting surface (1).

9. A construction method for prefabricating UHPC guardrail panels using any one of claims 1 to 8, characterized in that The following steps are involved: S1. Layout measurement; according to the measurement results, the top elevation positioning marks of the guardrail panel (3) are set at intervals of several meters on the top surface of the guardrail reinforcement, and the elevation positioning hanging line is set along the mark; according to the layout point, the edge line of the support frame (2) is popped up as the control line for the installation of the support frame (2); S2. Installation surface (1) treatment; clean the bridge deck and adjust and straighten the embedded steel bars and steel cage; S3. Install the support frame (2); according to the installation control line of the support frame (2), drill holes in the installation surface (1), insert the anchor bolts (5), align the fixing holes (24) of the support frame (2) with the inserted anchor bolts (5), and place a height adjustment device between the base (23) and the installation surface (1). Use the height adjustment device to adjust the support frame (2) to the height of the elevation positioning hanging line in S1, and then adjust the lateral position of the support frame (2) through the elliptical fixing holes (24) of the base (23) so that both sides of the support frame (2) are flush with the installation control line. Finally, tighten the fixing nuts (6) to fix the support frame (2); S4. Positioning and installation of the back panel (31); hoisting the back panel (31), the hook (35) is hung on the support frame (2), all the hooks (35) are inserted into the slot (46) and then slowly lowered at 45° until the back panel (31) is completely inserted into the hook (35); S5. Positioning and installation of the welcoming panel (32); hoisting the welcoming panel (32), the hook (35) is hung on the support frame (2), all the hooks (35) are inserted into the slots (46) and then slowly lowered at 45° until the welcoming panel (32) is completely inserted into the hook (35); S6. Installation of the expansion joint template (7); placing the expansion joint template (7) between two adjacent guardrail panels (3), and positioning the limit rod (71) of the expansion joint template (7) in the limit groove (25); S7. Connection and sealing of the guardrail panel (3); after inserting the plug-in plate (33) into the plug-in groove (36) on the guardrail panel (3), insert the vertical rod (42) into the tightening hole (34), and put the sleeve (43) on the vertical rod (42), install the fastening nut (44), and finally tighten the two fastening nuts (44) at the same time, the fastening nut (44) squeezes the sleeve (43) to press the bottom of the plug-in plate (33) upward, drive the inclined block (45) to tighten the two adjacent guardrail panels (3) downward and clamp the expansion joint template (7) between the two guardrail panels (3), and complete the sealing of the two adjacent guardrail panels (3); then fill the bottom gap of the guardrail panel (3) with foam glue to ensure that the bottom and side are sealed and leak-proof; S8. Elevation recheck: After all guardrail panels (3) are installed and sealed, use a level to recheck the elevation of the top surface of the anti-collision guardrail. S9. Concrete pouring: The guardrail concrete is poured in one go using a concrete tank truck in conjunction with a chute, and is compacted using an inserted vibrator; S10. Disassembly of auxiliary parts; when the concrete strength is higher than 75%, first loosen the fastening nut (44), and disassemble the tensioning assembly (4); then pull out the expansion joint template (7) in parallel and fill the groove produced by the stop rod (71); S11. Guardrail maintenance: The guardrail maintenance time shall not be less than 7 days, and the concrete surface shall be kept moist at all times during the maintenance period.

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