Novel prefabricated UHPC-OSD combined bridge deck slab module and construction method

Abstract

The invention discloses a novel prefabricated UHPC-OSD combined bridge deck module and a construction method, and relates to the technical field of bridge engineering, the module comprises a top plate, a plurality of sets of T-shaped large longitudinal ribs are arranged at the bottom of the top plate, and connecting steel sheets and assembling steel sheets are welded to the two ends of the T-shaped large longitudinal ribs; a conical rod is arranged in a bolt hole of the connecting steel sheet, the conical rod is in transmission connection with a reinforcing mechanism, when the connecting steel sheet and the assembling steel sheet are attached and inserted into a fixing bolt, the conical rod drives the reinforcing mechanism to lock and reinforce the connecting steel sheet and the assembling steel sheet, a U-shaped transverse stiffening rib is arranged at the bottom of the top plate, shear nails and a UHPC concrete layer are arranged on the surface, a steel wire mesh is arranged in the layer, short steel bars are arranged at the two ends, and wet joints are reserved. The construction comprises the steps of prefabricating the UHPC layer in a factory, performing steam curing, performing on-site splicing and the like, the construction quality and efficiency can be improved, and the structural stability is enhanced.

Description

TECHNICAL FIELD

[0001] The present application relates to bridge engineering technology, in particular to a new prefabricated UHPC-OSD composite bridge deck module and construction method. BACKGROUND

[0002] It is known that the orthotropic steel bridge deck (OSD) is an important landmark innovation achievement in modern bridge engineering, has outstanding advantages such as light weight, high bearing capacity, wide application range, and has become the first choice structure of large-span bridges. At present, the world has built more than 1500 bridges of all types using OSD, and the number of this type of bridges in operation and planning in China has reached more than 200. The promotion and application of this structure have greatly promoted the development of bridge engineering in the direction of large span, heavy load and structural modeling diversification.

[0003] The ultra-high performance concrete (UHPC) material is a new variety of cement-based structural engineering material with ultra-high strength, ultra-high toughness, ultra-high durability and good construction performance. By introducing a UHPC structural layer on the OSD top plate and forming a combined bridge deck through shear keys, the local stiffness of the bridge deck is significantly increased, the stress amplitude of each fatigue vulnerable part is greatly reduced, and the stress condition of the bridge deck pavement is improved, thereby providing a comprehensive solution for bridge deck fatigue cracking and bridge deck pavement vulnerability. In the construction of the UHPC-OSD composite bridge deck, the OSD part is usually produced in the factory and then transported to the construction site for assembly, and finally the ultra-high performance concrete (UHPC) pavement layer is cast on site. The casting of UHPC usually requires relatively strict construction conditions; affected by the site construction conditions, temperature, humidity and weather factors, the construction organization arrangement and construction progress and construction quality are difficult to control; at the same time, after the casting of a large amount of UHPC, shrinkage and creep will occur, which will generate internal stress between the steel beam and the UHPC concrete layer, affecting the initial mechanical properties.

[0004] The deficiency of the prior art is that with the application of the UHPC pavement layer on the OSD, the stiffness of the OSD can be significantly enhanced, the stress of the OSD can be improved, and the fatigue damage cracking phenomenon can be reduced. However, the structure of the OSD has not been changed, and the traditional form is still used, which contains many structural details that are prone to fatigue failure. After optimizing the traditional OSD, not only sufficient bearing capacity can be provided, but also the probability of fatigue failure can be reduced;

[0005] At the same time, the installation of the prefabricated UHPC-OSD composite bridge deck module at present completely relies on fixed bolts for assembly, and the connection firmness in the later stage also completely relies on fixed bolts, and when the fixed bolts are loose, the connection will be loose, which will affect the firmness of the whole. SUMMARY

[0006] The application aims to provide a novel prefabricated assembly type UHPC-OSD combined bridge deck module and construction method to solve the above problems in the prior art.

[0007] In order to achieve the above-mentioned purpose, the application provides the following technical scheme: comprising a top plate, further comprising:

[0008] T-shaped large longitudinal ribs, a plurality of groups of the T-shaped large longitudinal ribs are uniformly and spacedly welded at the longitudinal positions of the bottom of the top plate;

[0009] Connecting steel sheets and assembly steel sheets, a plurality of groups of the connecting steel sheets and the assembly steel sheets are welded at the two ends of the T-shaped large longitudinal ribs;

[0010] A conical rod is movably inserted into a bolt hole formed in the connecting steel sheet;

[0011] A reinforcing mechanism is in transmission connection with the conical rod, when the connecting steel sheet and the assembly steel sheet are in the state of adhesion and the fixing bolt is inserted, the conical rod passively drives the reinforcing mechanism to lock and reinforce each other between the connecting steel sheet and the assembly steel sheet.

[0012] As a further description of the above technical scheme: three groups of bolt holes are uniformly and spacedly formed at the upper, middle and lower positions of the surface of the connecting steel sheet, and two groups of folding grooves are formed at the intervals between the three groups of bolt holes.

[0013] As a further description of the above technical scheme: a threaded hole is formed at the position corresponding to the bolt hole on the surface of the connecting steel sheet, and a insertion hole is formed at the position corresponding to the folding groove.

[0014] As a further description of the above technical scheme: a conical rod is inserted into the bottom of the bolt hole at the upper position in the connecting steel sheet, a conical rod is inserted into the upper and lower ends of the bolt hole at the middle position, and a conical rod is inserted into the top of the bolt hole at the lower position.

[0015] As a further description of the above technical scheme: the reinforcing mechanism comprises a clamping plate which is telescopically installed in the folding groove, and the initial position of the clamping plate is located outside the folding groove, a insertion slot is formed at the center position of the bottom of the clamping plate, a rotating column is movably inserted into the insertion slot through a limiting mechanism, the one end of the rotating column away from the clamping plate is rotatably connected to the insertion slot through a bearing, rotating shafts are arranged at the obliquely opposite corners of the two sides of the rotating column and rotatably connect one end of a connecting rod, the other end of the connecting rod rotatably connects the bottom end of the conical rod, and a cavity is formed in the clamping plate and is adapted to the movable track of the connecting rod.

[0016] As a further description of the above technical scheme: the clamping plate is inserted into the insertion hole after the connecting steel sheet and the assembly steel sheet are adhered, and a limiting slot is arranged in the insertion hole.

[0017] As a further description of the above technical solution: the limiting mechanism comprises a sliding groove symmetrically formed in the two side walls of the slot, a sliding block is slidably connected in the sliding groove, a rotating groove is formed between the bottom end of the sliding groove and the sliding groove to form an L shape, and the sliding block is fixedly installed on both sides of the rotating column.

[0018] As a further description of the above technical solution: the initial position of the sliding block is located at the top end of the sliding groove, and when the sliding block is located at the initial position, the side of the sliding block away from the inner side wall of the top end of the sliding groove is abutted and connected with an elastic card, and the elastic card is arranged on the inner side wall of the sliding groove.

[0019] As a further description of the above technical solution: a U-shaped transverse stiffening rib is welded at a transverse position at the bottom of the top plate, a welding point is arranged at the junction of the U-shaped transverse stiffening rib and the T-shaped large longitudinal rib, the T-shaped large longitudinal rib is not continuously opened, the length of the U-shaped transverse stiffening rib is determined according to the interval size of the T-shaped large longitudinal rib, the end portions of the U-shaped transverse stiffening rib and the T-shaped large longitudinal rib are both provided with fixed screw holes, shear studs are arranged on the surface of the top plate, a UHPC concrete layer is arranged on the surface of the top plate, a steel mesh is arranged in the middle of the UHPC concrete layer, short steel bars are arranged at both ends of the UHPC concrete layer, and a wet joint of 10-20 cm is reserved in the UHPC concrete layer.

[0020] A novel prefabricated assembly type UHPC-OSD combined bridge deck module, and a construction method thereof.

[0021] S1, according to actual needs and the size of the wet joint, the position of the UHPC concrete layer is set, the marking area is marked by scribing, and the UHPC concrete layer is built, the steel mesh is arranged in the UHPC concrete layer, and the short steel bars are arranged at the ends.

[0022] S2, pouring the UHPC concrete layer;

[0023] S3, high-temperature steam curing is carried out in the factory;

[0024] S4, in the construction site, the corresponding assembly steel sheets and connecting steel sheets between adjacent two UHPC-OSD combined bridge deck modules are pasted, and then the fixed bolts are used for assembly.

[0025] In the above technical solution, the novel prefabricated assembly type UHPC-OSD combined bridge deck module and the construction method provided by the application have the following beneficial effects:

[0026] 1. Optimizing structure stress: through the T-shaped large longitudinal rib, the U-shaped transverse stiffening rib and other structures, the length of the weld and the fatigue vulnerable position are reduced, the local stiffness is enhanced, and the risk of fatigue damage cracking is reduced.

[0027] 2. Improve construction quality and efficiency: The UHPC concrete layer is prefabricated in the factory and is cured by high-temperature steam curing to avoid the influence of temperature, humidity, weather, etc. on site construction, which is convenient for controlling construction quality and progress.

[0028] 3. Reduce the influence of internal stress: Factory prefabrication can reduce the shrinkage and creep of UHPC after pouring, reduce the internal stress between the steel beam and the UHPC concrete layer, and ensure the initial mechanical properties.

[0029] 4. Improve overall performance: UHPC concrete layer and OSD cooperate to improve the stress of bridge deck pavement, steel mesh and end short steel reinforcement to improve the overall performance and wet joint strength of UHPC layer.

[0030] 5. Enhance the stability of the connection: When the connecting steel sheet and the assembled steel sheet are fixed, the reinforcing mechanism is passively driven by the insertion of the fixing bolt, which locks and reinforces the two, preventing the loosening of the bolt from causing the connection to loosen BRIEF DESCRIPTION OF DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed in the embodiments. Obviously, the drawings described below are only some embodiments described in the present application, and other drawings can also be obtained by those skilled in the art based on these drawings.

[0032] Figure 1 The overall structure schematic diagram provided by the embodiment of the present application;

[0033] Figure 2 The structure schematic diagram of the T-shaped longitudinal rib and the U-shaped transverse stiffening rib at the bottom of the top plate provided by the embodiment of the present application;

[0034] Figure 3 The structure schematic diagram of the connecting steel sheet and the assembled steel sheet provided by the embodiment of the present application;

[0035] Figure 4 The structure schematic diagram of the split structure between the clamping plate and the rotating column provided by the embodiment of the present application;

[0036] Figure 5 The structure schematic diagram of the cross section of the insertion slot in the clamping plate provided by the embodiment of the present application;

[0037] Figure 6 The structure schematic diagram of the Figure 5 The enlarged view of A in the middle;

[0038] Figure 7 The structure schematic diagram of the rotating column provided by the embodiment of the present application;

[0039] Figure 8 The structure schematic diagram of the limiting groove provided by the embodiment of the present application.

[0040] BRIEF DESCRIPTION OF DRAWINGS

[0041] 1 - top plate; 2 - T-shaped large longitudinal rib; 3 - connecting steel sheet; 4 - shear pin; 5 - end short steel bar; 6 - steel mesh; 7 - fixing screw hole; 8 - UHPC concrete layer; 9 - U-shaped transverse stiffening rib; 10 - assembled steel sheet; 11 - welding point; 12 - insertion hole; 13 - threaded hole; 14 - bolt hole; 15 - folding groove; 16 - clamping plate; 17 - conical rod; 18 - fixing bolt; 19 - insertion groove; 20 - connecting rod; 21 - rotating column; 22 - rotating shaft; 23 - sliding block; 24 - sliding groove; 25 - elastic clamping plate; 26 - rotating groove; 27 - bearing; 28 - limiting groove. DETAILED DESCRIPTION

[0042] In order for those skilled in the art to better understand the technical solutions of the present application, the present application will be further described in detail below with reference to the drawings.

[0043] Please refer to Figures 1-8 The embodiment of the present application provides a novel prefabricated assembly type UHPC-OSD combined bridge deck module and construction method technical scheme, which comprises a top plate 1, and further comprises:

[0044] A T-shaped large longitudinal rib 2 is uniformly and interval welded at the longitudinal position of the bottom of the top plate 1.

[0045] Connecting steel sheets 3 and assembled steel sheets 10 are welded at both ends of the T-shaped large longitudinal rib 2.

[0046] A conical rod 17 is movably inserted into the bolt hole 14 formed in the connecting steel sheet 3.

[0047] A reinforcing mechanism is in transmission connection with the conical rod 17, and when the connecting steel sheet 3 and the assembled steel sheet 10 are in the state of adhesion and the fixing bolt 18 is inserted, the conical rod 17 passively drives the reinforcing mechanism to lock and reinforce each other between the connecting steel sheet 3 and the assembled steel sheet 10.

[0048] In another embodiment of the present application, preferably, a U-shaped transverse stiffening rib 9 is welded at the transverse position of the bottom of the top plate 1, the U-shaped transverse stiffening rib 9 is provided with a welding point 11 at the junction with the T-shaped large longitudinal rib 2, the T-shaped large longitudinal rib 2 is not continuous, the length of the U-shaped transverse stiffening rib 9 is determined according to the interval size of the T-shaped large longitudinal rib 2, the end of the U-shaped transverse stiffening rib 9 and the T-shaped large longitudinal rib 2 is provided with a fixing screw hole 7, the surface of the top plate 1 is provided with a shear pin 4, the surface of the top plate 1 is provided with a UHPC concrete layer 8, the UHPC concrete layer 8 is provided with a steel mesh 6 in the middle, and short steel bars are arranged at both ends of the UHPC concrete layer 8, and 10-20 cm of wet joint is reserved in the UHPC concrete layer 8.

[0049] A novel prefabricated assembly type UHPC-OSD combined bridge deck module, and a construction method thereof are provided.

[0050] S1, according to actual needs and the size of the wet joint, the position of the UHPC concrete layer 8 is set, the marking area is marked, and the UHPC concrete layer 8 is built, the steel wire mesh 6 is arranged in the UHPC concrete layer 8, and the short steel bars are arranged at the ends;

[0051] S2, pouring the UHPC concrete layer 8;

[0052] S3, high-temperature steam curing is carried out in the factory;

[0053] S4, after the adjacent two UHPC-OSD combined bridge deck modules are pasted and the corresponding assembling steel sheets 10 and connecting steel sheets 3 are pasted, the fixed bolts 18 are used for assembly.

[0054] In still another embodiment of the present application, preferably, the reinforcing mechanism comprises a clamping plate 16 telescopically installed in the folding groove 15, the initial position of the clamping plate 16 is outside the folding groove 15, a slot 19 is formed at the bottom center position of the clamping plate 16, a rotating column 21 is movably inserted into the slot 19 through a limiting mechanism, the rotating column 21 is rotatably connected to the slot 19 through a bearing 27 at the end away from the clamping plate 16, a rotating shaft 22 is arranged at the obliquely opposite corners on both sides of the rotating column 21 and rotatably connects one end of a connecting rod 20, the other end of the connecting rod 20 is rotatably connected to the bottom end of the tapered rod 17, and a cavity is formed in the clamping plate 16 and matched with the movable track of the connecting rod 20.

[0055] In still another embodiment of the present application, three groups of bolt holes 14 are uniformly and spaced apart on the surface of the connecting steel sheet 3 at upper, middle and lower positions, and two groups of folding grooves 15 are formed at the intervals between the three groups of bolt holes 14.

[0056] In still another embodiment of the present application, a threaded hole 13 is formed on the surface of the connecting steel sheet 3 corresponding to the position of the bolt hole 14, and a plug hole 12 is formed corresponding to the position of the folding groove 15.

[0057] In still another embodiment of the present application, the tapered rod 17 is inserted into the bottom of the bolt hole 14 at the upper position in the connecting steel sheet 3, the tapered rod 17 is inserted into the upper and lower ends of the bolt hole 14 at the middle position, and the tapered rod 17 is inserted into the top of the bolt hole 14 at the lower position.

[0058] In still another embodiment of the present application, the clamping plate 16 is inserted into the plug hole 12 after being pasted with the connecting steel sheet 3 and the assembling steel sheet 10, and a limiting groove 28 is arranged in the plug hole 12.

[0059] The on-site construction method of the new prefabricated UHPC-OSD bridge deck slab is as follows:

[0060] After the new prefabricated UHPC-OSD bridge deck slab is transported to the site, the assembly steps are as follows:

[0061] (1) After the prefabricated assembly is transported to the construction site, it is hoisted to the corresponding position;

[0062] (2) Connect two adjacent new prefabricated UHPC-OSD bridge deck slabs, and use bolt connection at the position of the reserved fixed screw hole 7 at the end of the T-shaped large longitudinal rib 2, and the U-shaped transverse stiffening rib 9 is connected with the main beam, and in addition to bolt connection, the remaining parts are welded;

[0063] (3) Adjust the short steel bars 5 at the end of the pavement layer on the adjacent new prefabricated UHPC-OSD bridge deck slabs to ensure the quality of pouring;

[0064] (4) Set the wet joint formwork according to the actual situation, mix the UHPC concrete on site, and pour the UHPC concrete to the wet joint formwork;

[0065] (5) Vibrate, level and coat the wet joint, then perform on-site maintenance, and finally remove the formwork after the maintenance is completed.

[0066] When assembling the top plates 1, after the two groups of top plates 1 are attached together, the connecting steel sheet 3 at the end of the top plate 1 is attached to the assembly steel sheet 10 at the end of the next group of top plates 1, the fixing bolt 18 is screwed through the bolt hole 14 in the connecting steel sheet 3 and the threaded hole 13 in the assembly steel sheet 10, and the connecting steel sheet 3 and the assembly steel sheet 10 are tightly connected and fixed by the fixing bolt 18. In this process, the connecting steel sheet 3 and the assembly steel sheet 10 are reinforced by the reinforcing mechanism, and a layer of reinforcing mechanism is added between the connecting steel sheet 3 and the assembly steel sheet 10 to effectively prevent the connecting steel sheet 3 and the assembly steel sheet 10 from loosening due to loosening between the fixing bolt 18 and the nut;

[0067] After the connecting steel sheet 3 and the assembly steel sheet 10 are attached, the positions of the connecting steel sheet 3 and the assembly steel sheet 10 correspond to each other, the three bolt holes 14 on the surface of the connecting steel sheet 3 correspond to the three threaded holes 13 on the surface of the assembly steel sheet 10, and the folding slot 15 on the surface of the connecting steel sheet 3 corresponds to the position of the insertion hole 12 on the surface of the assembly steel sheet 10;

[0068] It should be noted that the clamping plate 16 protrudes from the surface of the connecting steel sheet 3 in the daily state, and only under the extrusion of a certain force can it be folded into the folding slot 15;

[0069] At this time, after the connecting steel plate 3 and the assembly steel plate 10 are attached together, the outward protruding clamping plate 16 will be directly inserted into the insertion hole 12, and then the fixing bolt 18 will be screwed into the bolt hole 14.

[0070] It should be noted that the three sets of bolt holes 14 inside the connecting steel plate 3 are positioned at the top, middle, and bottom. A tapered rod 17 is movably inserted into the bottom of the uppermost bolt hole 14, while two sets of tapered rods 17 are symmetrically inserted into the upper and lower ends of the middle bolt hole 14. A tapered rod 17 is movably inserted into the top of the lowermost bolt hole 14. The tapered rod 17 inserted at the bottom of the upper bolt hole 14 is connected to one side of the rotating column 21 via the connecting rod 20 and the rotating shaft 22, while the tapered rod 17 inserted at the top of the middle bolt hole 14... The tapered rod 17 is connected to the other side of the rotating column 21 via the connecting rod 20 and the rotating shaft 22. The rotating column 21 is movably inserted into the clamping plate 16 located between the upper bolt hole 14 and the middle bolt hole 14. Similarly, the tapered rod 17 inserted at the bottom of the middle bolt hole 14 and the tapered rod 17 inserted at the top of the lower bolt hole 14 are connected to both sides of the rotating column 21 inserted at the bottom of the clamping plate 16 located between the middle bolt hole 14 and the lower bolt hole 14 via two sets of connecting rods 20 and the rotating shaft 22.

[0071] When the fixing bolt 18 is screwed into the bolt hole 14, the tapered rod 17 inserted in the bolt hole 14 will be squeezed outward from the bolt hole 14 by the fixing bolt 18. First, the fixing bolt 18 is installed in the middle bolt hole 14. At this time, the fixing bolt 18 squeezes the tapered rod 17 inserted at the upper and lower ends of the middle bolt hole 14 upward and downward respectively, thereby driving the rotating column 21 to rotate through the two sets of connecting rods 20 and rotating shaft 22 respectively. While the rotating column 21 is rotating, the slider 23 is limited by the initial position of the slide groove 24, and the slider 2 3 is fixedly connected to the card plate 16, so the rotation of the rotating column 21 drives the card block to rotate, rotating the card block to a fixed angle between 10° and 45°. At this time, the card plate 16 is rotated in the insertion hole 12, thereby rotating the card plate 16 from the position coinciding with the insertion hole 12 to the position that matches the limiting groove 28. The limiting groove 28 limits the position of the card plate 16, so that the card plate 16 cannot be pulled out from the insertion hole 12. The fixing bolts 18 and nuts are used to fix the position between the connecting steel plate 3 and the assembly steel plate 10.

[0072] In another embodiment of the present invention, the limiting mechanism includes sliding grooves 24 symmetrically opened on both sides of the inner side wall of the slot 19, a slider 23 slidably connected in the sliding grooves 24, a rotating groove 26 opened at the bottom of the sliding grooves 24 to form an L-shape with the sliding grooves 24, and the slider 23 is fixedly installed on both sides of the rotating column 21.

[0073] In another embodiment of the present invention, the initial position of the slider 23 is located at the top of the slide groove 24. When the slider 23 is in the initial position, the side of the slider 23 away from the inner sidewall of the top of the slide groove 24 is connected to an elastic card 25. The elastic card 25 is disposed on the inner sidewall of the slide groove 24.

[0074] It should be noted here that:

[0075] 1. The rotating shaft 22 of the connecting rod 20 is set on both sides of the rotating column 21. The initial position of the rotating shaft 22 is located at the diagonal of the rotating column 21. The tapered rod 17 and the connecting rod 20 are also rotatably connected. The tapered rod 17 will slide up and down due to the restriction of the groove in the bolt hole 14 that allows the tapered rod 17 to move. The rotatable connection between the tapered rod 17 and the connecting rod 20 is achieved when the tapered rod 17 is squeezed by the fixing bolt 18, which rotates the connecting rod 20 and pushes the rotating column 21. This rotates the rotating shaft 22 from the diagonal to the transverse diagonal position on the surface of the rotating column 21. During this process, the rotation angle of the rotating column 21 is between 10° and 45°.

[0076] 2. The rotating column 21 is inserted into the slot 19 opened inside the card plate 16. The sliders 23 are symmetrically arranged on both sides of one end. The initial position of the slider 23 is located at the top of the symmetrically opened grooves 24 inside the slot 19. One side of the slider 23 is attached to the inner side wall of the top of the groove 24. The other side of the slider 23 is provided with elastic cards 25 on the inner side wall of the groove 24 on both the upper and lower sides. These cards can limit the position of the slider 23 in the groove 24 and ensure that when the slider 23 is subjected to a certain pressure, it can squeeze the elastic cards 25 in the groove 24 and slide in the groove 24. A rotating groove 26 is opened on one side of the bottom of the groove 24. The direction of the rotating groove 26 is the same as the direction of rotation of the rotating column 21.

[0077] Third, the outward-facing side of the card plate 16 is set as a flat plate, while the side of the card plate 16 facing the folding groove 15 connecting the steel sheet 3 is set as inclined towards the middle, so that the side cross-section of the card plate 16 forms an isosceles trapezoidal shape, so that the card plate 16 can better fit the limiting groove 28 for limitation after being inserted into the insertion hole 12.

[0078] Fourth, the end of the rotating column 21 away from the card plate 16 is rotatably connected to the bottom inner wall of the folding groove 15 through the bearing 27, so as to realize the rotation of the rotating column 21.

[0079] 5. After installing the fixing bolt 18 in the middle bolt hole 14, install the fixing bolts 18 in the upper and lower bolt holes 14 as well. Since the rotation of the rotating column 21 directly pulls the conical rods 17 inserted in the upper and lower bolt holes 14 when the fixing bolt 18 is inserted in the middle position, the fixing bolt 18 will no longer resist the conical rods 17 when installing the fixing bolts 18 in the upper and lower bolt holes 14. Only after the fixing bolt 18 is installed in the bolt hole 14 will the tip of the conical rod 17 resist and adhere to the surface of the fixing bolt 18, thus limiting the position of the conical rod 17. At this point, the fixing bolts 18 inserted in the upper middle and lower middle bolt holes 14 form pairs, and only in the upper middle or lower middle positions... Only when the fixing bolts 18 in both bolt holes 14 fall out will the rebound of the tapered rod 17 cause the clamping plate 16 to rotate, leading to loosening between the connecting steel plate 3 and the assembled steel plate 10. Since the tapered rod 17 is not equipped with any reset mechanism, and friction occurs between the clamping plate 16 and the insertion hole 12 and the limiting groove 28, the tapered rod 17 cannot be reset. Therefore, the connection between the connecting steel plate 3 and the assembled steel plate 10 is better defined. Separation between the connecting steel plate 3 and the assembled steel plate 10 is only possible if all three fixing bolts 18 (upper, middle, and lower) fall out, and this is only a possibility. The friction between the clamping plate 16 and the limiting groove 28 reduces the probability of this event and improves the firmness of the connection between the connecting steel plate 3 and the assembled steel plate 10.

[0080] When installed at the edge position, since there is no assembly steel plate 10 at the edge position, the clamping plate 16 cannot be inserted into the corresponding insertion hole 12 on the surface of the assembly steel plate 10 during installation. Therefore, the crossbeam at the edge will abut against the clamping plate 16. After the abutting force is greater than the restriction of the elastic card 25 on the slider 23, the slider 23 will be inserted from the top position of the groove 24 to the end position, thereby inserting the rotating column 21 into the clamping plate 16. At this time, the rotating column 21 is fixed, and the clamping plate 16 will be inserted into the folding groove 15 on the surface of the connecting steel plate 3. At this time, when the fixing bolt 18 is inserted into the bolt hole 14, when the fixing bolt 18 abuts against the tapered rod 17, the tapered rod 17 continues to retract and drives the rotating column 21 to rotate through the connecting rod 20 and the rotating shaft 22. At this time, since the slider 23 is located in the rotating groove 26, the slider 23 will rotate in the rotating groove 26 with the rotation of the rotating column 21, and will not drive the clamping plate 16 to rotate.

[0081] The following points need to be added to the above plan:

[0082] The new UHPC-OSD composite bridge deck module includes shear studs 4, top plate 1, T-shaped longitudinal ribs 2, and U-shaped transverse stiffening ribs 9, which are very different from the traditional UHPC-OSD composite bridge deck module structure.

[0083] Shear studs 4 are installed on the top plate 1, and the thickness of the top plate 1 is 14-18mm;

[0084] The connecting steel sheet 3 and the assembly steel sheet 10 are welded to the end of the T-shaped longitudinal rib 2, with a thickness of 6-8 mm;

[0085] The UHPC concrete layer 8 is laid directly on the OSD top slab 1 in the factory and then subjected to high-temperature steam curing.

[0086] The UHPC concrete layer 8 is 5cm thick, and a 10-20cm wet joint is reserved in the UHPC concrete layer 8. The UHPC concrete layer 8 has ultra-high strength, ultra-high toughness, and ultra-high durability.

[0087] The wire mesh 6 is placed in the middle of the UHPC concrete layer 8, which can improve the tensile strength and integrity of the UHPC concrete layer 8. The mesh size of the wire mesh 6 is about 2cm and the wire diameter is 1-2mm.

[0088] The end short steel bars 5 are placed at both ends of the UHPC concrete layer 8 to ensure the strength of the wet joint during splicing, with an exposed length of 10-20cm.

[0089] This novel prefabricated UHPC-OSD bridge deck module introduces a new OSD top plate 1 structure. While differing from traditional OSD top plates 1 in both longitudinal and transverse structural stiffness, the superior performance of the UHPC concrete layer 8 significantly improves the stress distribution of the OSD top plate 1 and reduces fatigue damage and cracking. Therefore, the traditional longitudinal stiffeners can be replaced with large T-shaped longitudinal stiffeners 2, and the transverse diaphragms can be replaced with small-sized U-shaped transverse stiffeners 9. Compared to the traditional OSD top plate 1 structure, this not only greatly reduces weld length and the number of fatigue-prone areas but also better overcomes localized deformation caused by localized wheel loads. Furthermore, it proposes direct assembly in the factory workshop. UHPC concrete layer 8 is poured and cured on the new OSD top slab 1 structure. There are many curing methods for UHPC concrete layer 8, including normal temperature curing, constant temperature curing, and high temperature steam curing. These methods can all be implemented during factory prefabrication. The optimal choice can be made according to the actual situation. Moreover, when UHPC concrete layer 8 is prefabricated in the factory for pouring and curing, the environmental influence of the construction site can be completely avoided. The quality of UHPC concrete layer 8 is higher than that of on-site construction. The thickness of UHPC concrete layer 8 is determined according to the actual design requirements. The mixing, transportation, and vibration processes of UHPC concrete layer 8 are all existing technologies and will not be described in detail here.

[0090] It should also be noted that the specific parameters of the new prefabricated UHPC-OSD bridge deck module, including the module length, the dimensions and spacing of the UHPC concrete layer 8, the T-shaped longitudinal ribs 2, the U-shaped transverse stiffening ribs 9, and other special components, which involve material properties, quantity distribution, shape structure, and size, should be determined according to the actual engineering needs. Any suitable case that can be improved and applied can be used in this invention.

[0091] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A novel prefabricated UHPC-OSD composite bridge panel module, comprising: Top plate (1), characterized in that it further includes: T-shaped longitudinal ribs (2), multiple sets of the T-shaped longitudinal ribs (2) are evenly spaced and welded to the bottom longitudinal position of the top plate (1); Connecting steel sheet (3) and assembling steel sheet (10), multiple sets of connecting steel sheet (3) and assembling steel sheet (10) are welded to both ends of the T-shaped longitudinal rib (2); A tapered rod (17) is movably inserted into a bolt hole (14) opened in the connecting steel plate (3); The reinforcement mechanism is connected to the tapered rod (17) in a transmission manner. When the connecting steel plate (3) and the assembled steel plate (10) are in a close fit and the fixing bolt (18) is inserted, the tapered rod (17) passively drives the reinforcement mechanism to lock and reinforce the connecting steel plate (3) and the assembled steel plate (10) together.

2. The novel prefabricated UHPC-OSD combined bridge panel module according to claim 1, characterized in that, The connecting steel sheet (3) has three sets of bolt holes (14) evenly spaced at the top, middle and bottom positions, and two sets of folding grooves (15) are provided at the intervals between the three sets of bolt holes (14).

3. A novel prefabricated UHPC-OSD combined bridge panel module according to claim 1, characterized in that, The connecting steel sheet (3) has a threaded hole (13) at the position corresponding to the bolt hole (14) and an insertion hole (12) at the position corresponding to the folding groove (15).

4. A novel prefabricated UHPC-OSD combined bridge panel module according to claim 1, characterized in that, A tapered rod (17) is inserted into the bottom of the bolt hole (14) at the upper position of the connecting steel plate (3), a tapered rod (17) is inserted into both the upper and lower ends of the bolt hole (14) at the middle position, and a tapered rod (17) is inserted into the top of the bolt hole (14) at the lower position.

5. A novel prefabricated UHPC-OSD combined bridge panel module according to claim 1, characterized in that, The reinforcement mechanism includes a telescopically mounted card plate (16) installed in the folding groove (15), and the initial position of the card plate (16) is located outside the folding groove (15). A slot (19) is provided at the center of the bottom of the card plate (16). A rotating column (21) is movably inserted into the slot (19) through a limiting mechanism. The end of the rotating column (21) away from the card plate (16) is rotatably connected to the slot (19) through a bearing (27). A rotating shaft (22) is provided at the diagonal positions on both sides of the rotating column (21) and rotatably connected to one end of a connecting rod (20). The other end of the connecting rod (20) is rotatably connected to the bottom end of a tapered rod (17). A cavity is opened in the card plate (16) that is adapted to the movement trajectory of the connecting rod (20).

6. A novel prefabricated UHPC-OSD combined bridge panel module according to claim 5, characterized in that, The card plate (16) is inserted into the socket (12) after the connecting steel plate (3) and the assembly steel plate (10) are attached. A limit groove (28) is provided in the socket (12).

7. A novel prefabricated UHPC-OSD composite bridge deck module and construction method according to claim 5, characterized in that, The limiting mechanism includes symmetrically opened sliding grooves (24) on both sides of the slot (19). A slider (23) is slidably connected in the sliding groove (24). A rotating groove (26) is opened at the bottom of the sliding groove (24) and forms an L-shape with the sliding groove (24). The slider (23) is fixedly installed on both sides of the rotating column (21).

8. A novel prefabricated UHPC-OSD combined bridge panel module according to claim 7, characterized in that, The initial position of the slider (23) is located at the top of the groove (24). When the slider (23) is in the initial position, the side of the slider (23) away from the inner wall of the top of the groove (24) is connected to an elastic card (25). The elastic card (25) is provided on the inner wall of the groove (24).

9. A novel prefabricated UHPC-OSD combined bridge panel module according to claim 1, characterized in that, The top plate (1) has a U-shaped transverse stiffening rib (9) welded to the bottom transverse position. A welding point (11) is provided at the junction of the U-shaped transverse stiffening rib (9) and the T-shaped longitudinal rib (2). The T-shaped longitudinal rib (2) is not broken. The length of the U-shaped transverse stiffening rib (9) is determined according to the interval size of the T-shaped longitudinal rib (2). The ends of the U-shaped transverse stiffening rib (9) and the T-shaped longitudinal rib (2) are provided with fixing screw holes (7). Shear nails (4) are provided on the surface of the top plate (1). A UHPC concrete layer (8) is provided on the surface of the top plate (1). A wire mesh (6) is provided in the middle of the UHPC concrete layer (8). Short steel bars are provided at both ends of the UHPC concrete layer (8). At the same time, a wet joint of 10-20cm is reserved in the UHPC concrete layer (8).

10. A novel prefabricated UHPC-OSD combined bridge panel module according to any one of claims 1-9, characterized in that, The construction method for this new prefabricated UHPC-OSD composite bridge deck module is as follows: S1. According to actual needs and the size of wet joint, set the position of UHPC concrete layer (8), mark the area, and build UHPC concrete layer (8). Arrange wire mesh (6) in UHPC concrete layer (8) and short steel bars at the ends. S2, pour the UHPC concrete layer (8); S3. High-temperature steam curing and maintenance in the factory; S4. At the construction site, the two adjacent UHPC-OSD combined bridge panel modules are bonded together, and the assembly steel sheet (10) and the connecting steel sheet (3) are bonded together accordingly. Then, the fixing bolts (18) are used for assembly.

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