UHPC wet joint prefabricated assembly type culvert and construction method

Abstract

The application relates to the technical field of assembled culvert structures, and provides a UHPC wet joint prefabricated assembled culvert and a construction method, which comprises a bearing assembly and a prefabricated component. The bearing assembly comprises a bearing table, a bottom die is arranged on the bearing table, the top surface of the bottom die is flush with the designed bottom surface of the prefabricated component, a joint pouring cavity is formed between the bottom die and the adjacent prefabricated component, positioning blocks abutting against the side edges of the bottom die are respectively connected to the two sides of the bearing table, positioning holes matched with the positioning blocks are arranged at the bottom of the prefabricated component, and adjusting assemblies for joint assembly alignment adjustment and pre-tightening force application are arranged between the adjacent prefabricated components. The top surface of the bottom die is flush with the designed bottom surface, the UHPC is poured according to the complete designed height without weakening the effective section, the positioning blocks and the positioning holes are matched to realize accurate assembly positioning, the adjusting assemblies have the functions of joint width adjustment, abutment elimination and pre-tightening, the joint bearing capacity and the integrity are significantly improved, the construction quality is controllable, and the assembled culvert is suitable for rapid assembly.

Description

Technical Field

[0001] This invention relates to the field of prefabricated culvert structure technology, and more specifically, to a UHPC wet joint prefabricated culvert and its construction method. Background Technology

[0002] Precast culverts, constructed using a factory-prefabrication and on-site assembly method, offer advantages such as stable component quality, rapid construction speed, and minimal environmental impact, leading to their widespread application in transportation infrastructure construction in recent years. After culvert segments are assembled, the joints between adjacent segments are crucial for structural stress and durability; their connection quality directly determines the overall performance of the culvert. Ultra-high performance concrete (UHPC), with its high strength, high modulus of elasticity, high durability, and excellent tensile properties, has become an ideal material for filling joints in precast components. Using UHPC wet joints to connect precast culvert segments has become an important technological development direction.

[0003] In existing UHPC wet joint constructions, a precast concrete slab is typically placed at the bottom of the joint as a protective layer, which also serves as the formwork for the subsequent UHPC pour. This construction presents several problems in practical applications: Firstly, the precast protective layer, located within the structural design height, occupies the effective pouring height of the UHPC joint, resulting in an actual UHPC cross-sectional height lower than the design value. During bending, both the internal force arm of the reinforcing steel and the effective tensile area of ​​the UHPC are reduced, directly weakening the joint's flexural bearing capacity. Secondly, multiple interfaces are formed between the precast protective layer, the precast components on both sides, and the subsequent UHPC. The newly added interface between the protective layer and the UHPC becomes a new weak point. If the interface is not properly roughened, cleaned, or moistened, poor adhesion or even detachment between the UHPC and the protective layer can easily occur, leading to a decrease in the overall integrity of the joint, damage to the waterproofing path, and potential leakage and durability issues during long-term service. Summary of the Invention

[0004] This invention provides a UHPC wet joint prefabricated assembled culvert and construction method, which solves the problems of the traditional UHPC wet joint protective layer encroaching on the effective cross-sectional height and adding weak interfaces, resulting in weakened load-bearing capacity and separation.

[0005] This invention is achieved through the following technical solution: a UHPC wet joint prefabricated assembled culvert, comprising a support component and prefabricated components; The supporting component includes a support platform with a bottom mold on the support platform. The top surface of the bottom mold is flush with the designed bottom surface of the precast component, and the bottom mold and the adjacent precast component enclose a joint casting cavity. Positioning blocks that abut against the sides of the bottom mold are connected to both sides of the support platform. Positioning holes that engage with the positioning blocks are opened at the bottom of the precast component. Adjustment components for joint alignment and pre-tightening are provided between adjacent precast components.

[0006] Furthermore, the adjustment assembly includes an adjustment nut and adjustment screws connected to both sides of the adjustment nut. The threads on both sides of the adjustment nut are in opposite directions, and the adjustment screws are pre-embedded in adjacent prefabricated components.

[0007] Furthermore, the precast components are pre-embedded with first connecting steel bars and second connecting steel bars. Several first connecting steel bars are evenly distributed along the axial direction of the culvert. The first connecting steel bars and second connecting steel bars are arranged perpendicularly to each other in the joint casting cavity.

[0008] Furthermore, a grouting pipe is arranged at the bottom of the joint casting cavity along the culvert axis, and a grout outlet pipe is vertically connected to the grouting pipe. Several overflow ports are evenly spaced along the height direction of the grout outlet pipe.

[0009] Furthermore, the precast components have shear grooves on the side wall of the joint casting cavity, and the shear grooves are arranged alternately along the axial and vertical directions of the culvert.

[0010] Furthermore, the precast components are fitted with water-stop strips on the side walls of the joint casting cavity.

[0011] Furthermore, at least two waterstop strips are provided along the width direction of the joint casting cavity.

[0012] Furthermore, longitudinal connecting bars are provided on the connecting end faces of adjacent precast components, and the longitudinal connecting bars are staggered along the height and width directions of the culvert.

[0013] Furthermore, a bent screw is inserted between the connecting end faces of adjacent precast components, and the end of the bent screw is fastened by a lock nut.

[0014] The construction method for a UHPC wet joint prefabricated culvert based on the above includes the following steps: S1. Level the foundation and install the support components at the designed joint locations; S2. Hoist the precast components to the designed position so that the positioning holes at the bottom of the precast components engage with the corresponding positioning blocks; S3. Adjust the joint width between adjacent precast components by adjusting the components to eliminate misalignment and apply preload to adjacent precast components; S4. Pour UHPC into the joint casting cavity to the design height; S5. After the UHPC reaches the specified strength, remove the adjustment components.

[0015] The present invention has at least the following advantages and beneficial effects: by aligning the bottom formwork on the support platform with the designed bottom surface of the precast component and enclosing it with adjacent precast components to form a joint casting cavity, and by using the snap-fit ​​positioning of the positioning block and positioning hole, as well as the alignment adjustment and pre-tightening of the adjustment component, the UHPC can be continuously cast at the complete design height without the effective cross-section being squeezed by the bottom formwork. The internal force arm of the reinforcing steel and the effective tensile area of ​​the UHPC are not reduced. At the same time, it eliminates the newly added weak interface and the risk of bond detachment between the traditional precast protective layer and the UHPC. The bending bearing capacity and integrity of the joint are significantly improved. The assembly positioning is accurate, the joint width is adjustable, and the components do not open during casting. The construction quality and long-term durability are both guaranteed. Attached Figure Description

[0016] Figure 1 This is a structural schematic diagram of a UHPC wet joint prefabricated assembled culvert provided by the present invention.

[0017] Figure 2 This is a structural schematic diagram from another perspective of a UHPC wet joint prefabricated assembled culvert provided by the present invention.

[0018] Figure 3 This invention provides a structural schematic diagram of longitudinal connecting steel bars and bent bolts in a UHPC wet joint prefabricated culvert.

[0019] Figure 4 This is a partially enlarged view of the joint casting cavity of a UHPC wet joint prefabricated culvert structure provided by the present invention.

[0020] Figure 5 For the present invention Figure 2 A magnified view of a portion of point A in the middle.

[0021] Reference numerals: 1-Supporting component, 11-Supporting platform, 12-Bottom formwork, 13-Positioning block, 2-Precast component, 20-Shear groove, 21-First connecting steel bar, 22-Second connecting steel bar, 23-Waterstop strip, 24-Longitudinal connecting steel bar, 25-Bending screw, 26-Locking nut, 3-Adjusting component, 31-Adjusting nut, 32-Adjusting screw, 4-Grouting pipe, 41-Grouting outlet pipe, 42-Overflow port. Detailed Implementation

[0022] Example like Figures 1 to 5 As shown, this embodiment mainly discloses a UHPC wet joint prefabricated assembled culvert, including a support component 1 and a prefabricated component 2; The support component 1 includes a support platform 11, on which a bottom mold 12 is provided. The top surface of the bottom mold 12 is flush with the designed bottom surface of the precast component 2, and the bottom mold 12 and the adjacent precast component 2 enclose each other to form a joint casting cavity. Positioning blocks 13 that abut against the sides of the bottom mold 12 are respectively connected to both sides of the support platform 11. The bottom of the precast component 2 is provided with positioning holes that engage with the positioning blocks 13. An adjustment component 3 is provided between adjacent precast components 2 for adjusting the alignment of the joint assembly and applying pre-tightening force.

[0023] Specifically, the supporting component 1 is arranged along the length of the culvert joint. The supporting platform 11 is made of steel or precast concrete, and its bottom is supported on the top surface of the leveled foundation. The bottom formwork 12 is placed on the upper surface of the supporting platform 11. The bottom formwork 12 is made of thin-walled steel plate or precast concrete slab. The top surface of the bottom formwork 12 is flush with the designed bottom surface of the precast component 2, so that the bottom formwork 12 is located outside the main load-bearing section of the structure. Positioning blocks 13 are set on both sides of the supporting platform 11. The inner side of the positioning block 13 abuts against the side of the bottom formwork 12 to limit the lateral displacement of the bottom formwork 12. The upper part of the positioning block 13 is inserted into the corresponding positioning hole opened at the bottom of the precast component 2, so as to achieve precise lateral and longitudinal positioning of the supporting platform 11 relative to the precast component 2, and avoid the offset of the supporting platform 11 or the movement of the bottom formwork 12 during the assembly process. The bottom formwork 12 and the end faces of the precast components 2 on both sides enclose each other to form a joint casting cavity with an opening at the top. The height of the joint casting cavity is consistent with the design height of the precast component 2, and the UHPC can be continuously cast according to the complete design height. The bottom formwork 12 does not occupy the effective cross-sectional height of the UHPC, and the internal force arm of the reinforcing steel and the effective tensile area of ​​the UHPC are not reduced, significantly improving the flexural bearing capacity and long-term durability of the joint.

[0024] Furthermore, in specific implementation, the aforementioned adjustment component 3 includes an adjustment nut 31 and adjustment screws 32 connected to both sides of the adjustment nut 31. The threads on both sides of the adjustment nut 31 are in opposite directions, and the adjustment screws 32 are respectively embedded in adjacent precast components 2. Specifically, the adjustment component 3 is arranged inside the culvert, with the two adjustment screws 32 embedded in adjacent precast components 2, and the ends of the adjustment screws 32 extending out of the end face of the precast component 2 and engaging with the adjustment nut 31. When the adjustment nut 31 is rotated, the two adjustment screws 32 simultaneously retract inward or extend outward, allowing bidirectional adjustment of the joint width to be achieved with a single nut. The adjustment screws 32 are embedded in the concrete of the precast component 2, with an anchorage length meeting the specifications. The ends are equipped with hooks or anchor plates to enhance the gripping force, ensuring that the screws do not loosen or come off during adjustment. The adjustment component 3 has three functions: joint width adjustment, misalignment elimination, and pre-tightening force application. During assembly, first rotate the nut to eliminate the height difference and lateral offset of the precast components 2 on both sides, then adjust precisely according to the design joint width, and finally apply pre-tightening force to prevent the precast components 2 from splitting apart during UHPC pouring.

[0025] Furthermore, in specific implementation, the aforementioned precast component 2 is pre-embedded with first connecting steel bars 21 and second connecting steel bars 22. Several first connecting steel bars 21 are evenly distributed along the culvert axis, and the first connecting steel bars 21 and second connecting steel bars 22 are arranged perpendicularly and alternately within the joint casting cavity. Specifically, both the first connecting steel bars 21 and second connecting steel bars 22 are U-shaped. The first connecting steel bars 21 are arranged vertically, with several evenly distributed along the culvert axis, and each first connecting steel bar 21 is parallel to the others. The second connecting steel bars 22 are arranged horizontally, spanning multiple first connecting steel bars 21, forming a perpendicular and staggered state with the first connecting steel bars 21 in space. This connects the dispersed vertical steel bars into a whole by the horizontal steel bars, avoiding stress concentration caused by independent force on a single steel bar, resulting in better overall stiffness and cooperative load-bearing performance of the skeleton. After the UHPC is cast, the horizontal second connecting steel bars 22 and the vertical first connecting steel bars 21 together form a spatial steel skeleton, and the UHPC fills the gaps in the skeleton to form an integrated force transmission system. Both the first connecting steel bar 21 and the second connecting steel bar 22 are equipped with hooks or mechanical anchor heads at their ends to ensure the anchorage length in the UHPC. The steel bar surfaces are rust-removed and coated with an interface agent to enhance their bonding performance with the UHPC. The bidirectional vertical and horizontal staggered arrangement of the steel bar cage enables continuous force transmission in both orthogonal directions. When the joint is subjected to shear, the horizontal and vertical steel bars share the shear force components in different directions. When subjected to bending, the tension zone steel bars continuously transmit force, significantly improving the shear bearing capacity and overall bending resistance.

[0026] Furthermore, in specific implementation, a grouting pipe 4 is arranged along the axial direction of the culvert at the bottom of the joint casting cavity. A grout outlet pipe 41 is vertically connected to the grouting pipe 4, and several overflow ports 42 are evenly spaced along the height direction of the grout outlet pipe 41. Specifically, the grouting pipe 4 is arranged along the axial direction of the culvert at the bottom of the joint casting cavity. The grouting pipe 4 is made of PVC pipe or steel pipe. The grout outlet pipe 41 is vertically connected to the grouting pipe 4, and the grout outlet pipe 41 extends upward to near the top of the joint casting cavity. Several overflow ports 42 are evenly spaced along the height direction of the wall of the grout outlet pipe 41. When injecting UHPC, the grout is pumped into the grouting pipe 4 and rises from bottom to top along the grout outlet pipe 41. The bottom is filled first, and as the grout level rises, the overflow ports 42 of each level successively discharge grout. When the highest overflow port 42 continuously and stably discharges grout, it indicates that the joint casting cavity has been filled and the gas has been vented. The low-level feeding and high-level overflow method solves the problems of the blind spot at the bottom of the joint being unobservable and prone to air pockets and voids. The grout discharge sequence of each level of overflow port 42 can serve as a direct basis for judging the filling density, making the bottom quality more controllable compared to top open pouring. One-way valves are installed at both ends of the grouting pipe 4 to prevent grout backflow.

[0027] Furthermore, in specific implementation, the precast component 2 is provided with shear grooves 20 on the side wall of the joint casting cavity. The shear grooves 20 are staggered along the culvert axis and vertical direction. Specifically, the shear grooves 20 have a trapezoidal or rectangular cross-section, with the groove opening facing the joint casting cavity. The shear grooves 20 are staggered along the culvert axis and vertical direction. After the UHPC is cast, the grout fills the shear grooves 20 to form a mechanical interlocking structure with concave and convex surfaces. The inner wall of the shear grooves 20 is roughened or coated with an interface agent to enhance the bonding strength with the UHPC. The groove opening edge is chamfered to facilitate the flow of UHPC and avoid air trapping at sharp corners. The staggered arrangement of the shear grooves 20 makes the force transmission path of the joint interface serrated and dispersed, which significantly improves the shear bearing capacity compared with the planar joint. At the same time, it avoids the stress concentration caused by a single row of shear grooves 20. When the joint is subjected to shear, each groove is evenly stressed, improving the overall integrity and fatigue resistance.

[0028] Furthermore, in specific implementation, the precast component 2 is fitted with a waterstop strip 23 on the side wall of the joint casting cavity. Specifically, a groove is pre-reserved in the side wall of the joint casting cavity of the precast component 2, and the waterstop strip 23 is embedded and fixed in the groove. The cross-sectional dimensions of the groove match those of the waterstop strip 23. The waterstop strip 23 is made of water-swellable rubber or putty-type waterstop material. The embedded groove positioning makes the waterstop strip 23 less prone to displacement or falling off during assembly. After being squeezed and deformed, it fully fills the joint gap, blocks the seepage channel, and has better waterproofing reliability than surface-adhesive waterstop strips 23.

[0029] Furthermore, in specific implementation, at least two waterstop strips 23 are provided along the width direction of the joint casting cavity. Specifically, multiple waterstop strips 23 form a multi-layered waterproof defense line and serve as backups for each other. Even if the outer waterstop strip 23 ages and fails during long-term service, the inner waterstop strip 23 can still perform its waterproof function, significantly improving the long-term waterproof durability of the joint. This multi-layered defense design is suitable for culvert projects with high groundwater levels or strict waterproof requirements.

[0030] Furthermore, in specific implementation, longitudinal connecting steel bars 24 are provided on the connecting end faces of the adjacent precast components 2, and the longitudinal connecting steel bars 24 are staggered along the height and width directions of the culvert. Specifically, longitudinal connecting steel bars 24 are pre-embedded on the connecting end faces of adjacent precast components 2, with hooks extending from the end faces, and are staggered along the height and width directions of the culvert. During assembly, the longitudinal connecting steel bars 24 of adjacent segments are staggered and overlapped, with the overlap length meeting the specification requirements, and the overlapped sections are fixed by binding wire. The longitudinal connecting steel bars 24 transmit axial tensile force and bending moment between segments, enhancing the integrity of the culvert segments. The staggered arrangement ensures that the connection strength is evenly distributed along the circumference of the end face, avoiding local weaknesses. The hooks face inward towards the joint, and the post-cast UHPC anchor solid completely encloses them, eliminating the risk of exposed corrosion.

[0031] Furthermore, in specific implementation, a bent screw 25 is inserted between the connecting end faces of the adjacent precast components 2, and the ends of the bent screw 25 are fastened by a locking nut 26. Specifically, a pre-embedded box with a perforation is pre-reserved on the connecting end face of the adjacent precast components 2. The pre-embedded box is located on the inner surface of the precast component 2, and the perforation penetrates the wall thickness of the precast component 2 and communicates with the inner cavity of the pre-embedded box. The bent screw 25 is inserted into the perforation of the adjacent precast component 2, with both ends extending into the inner cavity of the pre-embedded box. After a steel pad is installed, the locking nut 26 is screwed in and tightened to pull and fix the two precast components 2 together. The pre-embedded box is positioned and embedded during the factory prefabrication stage to provide operating space for the locking nut 26 and ensure the accuracy of the perforation position, avoiding damage to the reinforcing steel and concrete of the precast component 2 by drilling on site. After the locking nut 26 is tightened, the cavity of the pre-embedded box is sealed with a sealing material to keep the inner wall of the precast component 2 flat. The bent bolt 25 is made of high-strength steel, with a galvanized or anti-corrosion coating. Its bending shape adapts to the contours of the two end faces of the precast components and assembly errors. No on-site welding is required during installation; the connection is completed simply by inserting the bolt and tightening the nut, making construction quick. The bent bolt 25 and the longitudinal connecting steel bar 24 together form a dual shear-resistant connection system of steel bars and bolts. The bent bolt 25 provides mechanical locking force and shear bearing capacity, while the longitudinal connecting steel bar 24 provides tensile and bending resistance. The two work together to transfer force, resulting in a connection reliability higher than that of a single connection method.

[0032] In this embodiment, a construction method for a UHPC wet joint prefabricated culvert based on the above is also disclosed, including the following steps: S1. Level the foundation and install the support component 1 at the designed joint location. Specifically, after excavating the culvert foundation pit to the design elevation, remove the loose soil and accumulated water from the base, replace the soft areas with graded crushed stone and compact it, and pour a concrete cushion layer. Mark the center line of the joint and the edge line of the support platform 11 on the cushion layer according to the surveying and layout lines, hoist the support platform 11 into place, and level the bottom surface of the support platform 11 with grout between it and the cushion layer. Use a level to check the elevation of the top surface of the support platform 11 point by point. After the support platform 11 is stable, lay the bottom formwork 12. Use rubber sealing strips to seal the joints of the bottom formwork 12 to prevent grout leakage during UHPC grouting. After the bottom formwork 12 is laid, check the top surface elevation to confirm that the top surface of the bottom formwork 12 is flush with the designed bottom surface of the precast component 2, and that both sides of the bottom formwork 12 are tightly attached to the inner side of the positioning block 13 of the support platform 11.

[0033] S2. Hoist the precast component 2 to the designed position, ensuring that the positioning hole at the bottom of the precast component 2 engages with the corresponding positioning block 13. Specifically, the precast component 2 is hoisted using a truck crane or gantry crane, with the hoisting point located at the pre-embedded lifting ring at the top of the precast component 2. During hoisting, keep the precast component 2 horizontal and slowly lower it to a point 20cm above the support platform 11, then pause for manual alignment to ensure the positioning hole at the bottom of the precast component 2 aligns with the positioning block 13 on the support platform 11. Then, lower it at a uniform speed until the positioning block 13 inserts into the positioning hole for automatic guidance and positioning. After the precast component 2 is in place, use a level to verify the top elevation and a total station to verify the axis position. If there is a deviation between the positioning hole and the positioning block 13, use a jack to make minor horizontal adjustments to the precast component 2. Forced lowering is prohibited to prevent bending of the positioning block 13 or damage to the corners of the precast component 2. After the two adjacent precast components 2 are in place, the joint pouring cavity is initially formed. A steel ruler is used to check whether the joint width is uniform. If the local deviation is too large, it is finely adjusted by pry bar and jack.

[0034] S3. Adjust the joint width between adjacent precast components 2 using the adjusting component 3 to eliminate misalignment and apply pre-tightening force to adjacent precast components 2. Specifically, the adjusting nut 31 is rotated using a special wrench. First, the nuts at each adjusting point are symmetrically loosened. Then, the adjusting screws 32 on both sides are synchronously tightened through the positive and negative threads. The joint width is measured using a feeler gauge, and the change in joint width is recorded for each rotation, gradually approaching the design joint width. Misalignment is checked by placing a straightedge against the inner wall of the culvert and checking vertically and horizontally. After marking the position where the gap between the straightedge and the surface of the precast component 2 exceeds the requirement, the adjusting nut 31 at the corresponding position is finely adjusted. After the joint width and misalignment meet the standards, a torque wrench is used to apply pre-tightening force to each adjusting nut 31. The pre-tightening force is controlled according to the design value, and the deviation of the pre-tightening force at each point does not exceed ±10%. After pre-tightening, markings are drawn on the adjusting nut 31 and the adjusting screw 32 to prevent the nuts from loosening in subsequent processes. The adjustment process follows the principles of symmetry, uniformity, and phased adjustment, and excessive adjustment at a single point is prohibited, which may cause torsion of the precast component 2 or local stress concentration.

[0035] S4. Pour UHPC into the joint casting cavity to the design height. Specifically, the UHPC is mixed on-site using a forced mixer for at least the specified time. After mixing, the fluidity is tested, and if qualified, it is pumped into the joint casting cavity through the bottom grouting pipe 4. The grouting is done at a low speed and continuously, with the pumping pressure controlled within a reasonable range to avoid excessive pressure that could break open the bottom mold 12 or cause deformation of the formwork. The grout fills the joint casting cavity area, the shear groove 20, and the area with dense reinforcement from the bottom up. As the grout level rises, the overflow ports 42 arranged along the height direction will discharge grout sequentially until the highest overflow port 42 discharges grout continuously and stably without any air bubbles. This indicates that the gas in the joint casting cavity has been completely expelled and the UHPC has been filled to the design height. At this point, the grouting is stopped, and the pumping pressure is maintained for a few seconds before the grouting port is closed.

[0036] S5. After the UHPC reaches the specified strength, remove the adjusting component 3. Specifically, after the UHPC is poured, cover it with geotextile and water it for curing. Keep the surface moist during the curing period. The adjusting component 3 can only be removed after the compressive strength of the test block cured under the same conditions reaches the design specified value. When removing it, cut off the part of the adjusting component 3 that protrudes from the surface of the precast component 2 as a whole. Grind the cut surface smooth and apply rust prevention treatment to ensure the smoothness and durability of the inner wall of the precast component 2.

Claims

1. A UHPC wet joint prefabricated assembled culvert, characterized in that, Includes supporting components (1) and prefabricated components (2); The supporting component (1) includes a supporting platform (11), on which a bottom mold (12) is provided. The top surface of the bottom mold (12) is flush with the designed bottom surface of the precast component (2), and the bottom mold (12) and the adjacent precast component (2) enclose each other to form a joint casting cavity. Positioning blocks (13) that abut against the sides of the bottom mold (12) are respectively connected to both sides of the supporting platform (11). The bottom of the precast component (2) is provided with positioning holes that engage with the positioning blocks (13). An adjustment assembly (3) for joint assembly alignment adjustment and application of pre-tightening force is provided between adjacent prefabricated components (2).

2. The UHPC wet joint prefabricated assembled culvert according to claim 1, characterized in that, The adjustment assembly (3) includes an adjustment nut (31) and adjustment screws (32) connected to both sides of the adjustment nut (31). The threads on both sides of the adjustment nut (31) are opposite in direction, and the adjustment screws (32) are respectively embedded in the adjacent prefabricated components (2).

3. A UHPC wet joint prefabricated assembled culvert according to claim 1, characterized in that, The precast component (2) is pre-embedded with a first connecting steel bar (21) and a second connecting steel bar (22). The first connecting steel bar (21) is evenly distributed along the axial direction of the culvert. The first connecting steel bar (21) and the second connecting steel bar (22) are arranged perpendicularly to each other in the joint casting cavity.

4. A UHPC wet joint prefabricated assembled culvert according to claim 1, characterized in that, A grouting pipe (4) is arranged at the bottom of the joint casting cavity along the culvert axis. A grout outlet pipe (41) is vertically connected to the grouting pipe (4). The grout outlet pipe (41) is provided with several overflow ports (42) evenly spaced along the height direction.

5. A UHPC wet joint prefabricated assembled culvert according to claim 1, characterized in that, The precast component (2) has a shear groove (20) on the side wall of the joint casting cavity, and the shear groove (20) is arranged alternately along the axial and vertical directions of the culvert.

6. A UHPC wet joint prefabricated assembled culvert according to claim 1, characterized in that, The precast component (2) is fitted with a waterstop strip (23) on the side wall of the joint casting cavity.

7. A UHPC wet joint prefabricated assembled culvert according to claim 6, characterized in that, At least two waterstop strips (23) are provided along the width direction of the joint casting cavity.

8. A UHPC wet joint prefabricated assembled culvert according to claim 1, characterized in that, The connecting end faces of adjacent precast components (2) are provided with longitudinal connecting steel bars (24), and the longitudinal connecting steel bars (24) are staggered along the height and width directions of the culvert.

9. A UHPC wet joint prefabricated assembled culvert according to claim 1, characterized in that, A bent screw (25) is inserted between the connecting end faces of adjacent prefabricated components (2), and the end of the bent screw (25) is fastened by a lock nut (26).

10. A construction method for a UHPC wet-joint prefabricated culvert according to any one of claims 1 to 9, characterized in that, Includes the following steps: S1. Level the foundation and install the supporting components (1) at the designed joint positions; S2. Hoist the prefabricated component (2) to the designed position so that the positioning hole at the bottom of the prefabricated component (2) engages with the corresponding positioning block (13); S3. Adjust the joint width between adjacent precast components (2) by adjusting component (3) to eliminate misalignment and apply preload to adjacent precast components (2); S4. Pour UHPC into the joint casting cavity to the design height; S5. After the UHPC reaches the specified strength, remove the adjustment component (3).

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