Reinforcing device and reinforcing construction method for prestressed hollow slab bridge

Abstract

The application relates to the technical field of bridge construction, and provides a reinforcing device for a prestressed hollow slab bridge, which comprises a first steel structure plate and a second steel structure plate fixed to the two sides of the web of a hollow slab, the side surface of the first steel structure plate is provided with a plurality of first abutting pieces, the outer side surface of the first abutting piece is arranged in an arc shape, the side surface of the second steel structure plate is provided with a second abutting piece, and the outer side surface of the second abutting piece is arranged in an arc shape; in a fixed state, each first abutting piece and each second abutting piece are alternately arranged in the vertical direction to jointly form a reinforcing structure, and the arc surface of the first abutting piece on the hollow slab and the arc surface of the second abutting piece on the adjacent hollow slab abut and limit each other; the reinforcing device further comprises steel strands arranged through the hollow slabs, the two ends of the steel strands are fixedly arranged, and the steel strands are always in a taut state. Therefore, the structural strength of hinge joint concrete between two hollow slabs can be improved, and the possibility of cracks in the hinge joint concrete and cracks in the bottom of the bridge can be reduced.

Description

Technical Field

[0001] This application relates to the field of bridge construction technology, and in particular to a reinforcement device and reinforcement construction method for a prestressed hollow slab bridge. Background Technology

[0002] Hollow slab bridges refer to bridge structures built with hollow slabs. Compared with traditional construction techniques, prefabricated hollow slabs have advantages such as light weight, convenient transportation and installation, saving concrete and reducing overall costs. Therefore, they are widely used in the construction of buildings and bridges.

[0003] The gap between two hollow slabs in a hollow slab bridge is called a "hinge joint," typically only 1-1.5 cm wide. During bridge construction, this gap is often filled with fine-grained concrete. This means that cracks in the web of the hollow slab cannot be detected and reinforced in time. Failure in the web of the hollow slab is often only discovered after the cracks have developed to the base slab, at which point the damage has essentially penetrated the entire bridge structure. This directly leads to insufficient shear strength of the entire bridge, resulting in serious safety hazards and affecting safe vehicle passage. Therefore, effectively reducing the likelihood of cracks forming in the concrete of the hinge joint between two hollow slabs has become an urgent problem to solve. Summary of the Invention

[0004] Based on this, this application provides a reinforcement device and reinforcement construction method for prestressed hollow slab bridges, which can improve the structural strength of the concrete joint between two hollow slabs and reduce the possibility of cracks forming in the concrete joint and cracks appearing at the bottom of the bridge.

[0005] Firstly, the reinforcement device for prestressed hollow slab bridge provided in this application adopts the following technical solution:

[0006] A reinforcement device for a prestressed hollow slab bridge includes a first steel structure plate and a second steel structure plate fixed to the sides of the hollow slab. The first steel structure plate has a plurality of first abutment members on its side, and the outer surface of the first abutment members is arc-shaped. The second steel structure plate has a second abutment member on its side, and the outer surface of the second abutment member is arc-shaped. In a fixed state, each of the first abutment members and each of the second abutment members are alternately arranged vertically to form a reinforcement structure. The arc surface of the first abutment member on the hollow slab abuts and limits the movement of the arc surface of the second abutment member on the adjacent hollow slab.

[0007] By adopting the above-mentioned technical solution, this application fixes the first steel structure plate and the second steel structure plate to the two sides of the hollow slab respectively. After the hollow slabs are laid side by side, the first abutting members and the second abutting members of the two adjacent hollow slabs alternately and sequentially abut and limit each other in the vertical direction, which can form a reinforced structure. When the bridge is subjected to vertical loads from vehicles, the magnitude of the vertical load is reduced by the abutting and unloading between the adjacent first abutting members and the second abutting members. This can effectively reduce the possibility of longitudinal movement between adjacent hollow slabs, thereby reducing the possibility of cracks forming in the hinge joint concrete.

[0008] Furthermore, since both the first and second abutting members engage and limit the load using an arc-shaped contact surface, the vertical load can be converted into a lateral load acting on the hinge joint concrete. The taut steel strands bring the hollow slabs closer together and allow them to abut against each other. The prestress of the steel strands partially offsets the converted lateral load, thereby reducing the magnitude of the load transmitted to the bridge interior and lowering the possibility of back-to-back movement between adjacent hollow slabs and lateral cracking of the hinge joint concrete. Therefore, the reinforcement device of this application can significantly improve the structural strength of the hinge joint concrete, reduce the possibility of cracks forming in the hinge joint concrete and cracking at the bottom of the bridge, ensuring the safe use of the bridge and the safe passage of vehicles.

[0009] Optionally, it also includes a transverse steel beam spanning the bottom of each hollow slab, with a concrete base slab between the transverse steel beam and the hollow slab; the length direction of the transverse steel beam is perpendicular to the length direction of the hollow slab, and the transverse steel beam is fixed with multiple reinforcing plates, each of the reinforcing plates being correspondingly arranged below each hinge joint; the reinforcing plates are connected and fixed with two sets of first connectors, the two sets of first connectors being used to connect two adjacent hollow slabs respectively.

[0010] By adopting the above technical solution, each pair of adjacent hollow slabs is connected by reinforcing plates, and each reinforcing plate is fixed together to the horizontal steel beam. This allows the horizontal steel beam to provide lateral connection and reinforcement to each hollow slab, enabling the hollow slabs to form an integral bridge structure. When the bridge is subjected to vertical loads, the horizontal steel beam and the reinforcing plates can jointly offset the vertical loads on the bridge, thereby enhancing the overall shear strength of the bridge structure.

[0011] Optionally, the reinforcing plate is provided with two limiting rods, each of which passes through the transverse steel beam and extends above the concrete base plate; in the fixed state, the two limiting rods respectively abut against two opposite sides of the reinforcing structure.

[0012] By adopting the above-mentioned technical solution, during the construction of the bridge structure of this application, the reinforcing plate is connected to the horizontal steel beam after the concrete base slab is poured and formed and the horizontal steel beam is fixed, and two adjacent hollow slabs are connected by the first connector; the fixed limiting rod extends above the concrete base slab, and the two limiting rods can jointly form a positioning area for positioning the reinforcing structure. Placing the first abutment and the second abutment inside the positioning area allows the first abutment and the second abutment to cooperate and abut, improving the overall structural strength of the bridge structure. Moreover, when the hollow slabs experience longitudinal displacement, the limiting rods abut against the abutment, which can further reinforce the hollow slabs and reduce the possibility of cracks forming at the bottom of the bridge.

[0013] Optionally, it also includes a leveling mechanism located above each hollow slab, wherein multiple sets of leveling mechanisms are provided, and all leveling mechanisms are arranged at intervals along the length of the hollow slab.

[0014] The leveling mechanism includes an upper fixed plate, a pressure plate, and an adjustment component. The upper fixed plate is connected and fixed to each reinforcing plate via a second connector. The pressure plate is movably connected to the upper fixed plate, and the adjustment component is located outside the pressure plate. The adjustment component is used to force the pressure plate to move downward and press against each hollow plate.

[0015] By adopting the above technical solution, after the upper fixing plate is connected to the reinforcing plate through the second connector, the upper fixing plate can be kept fixed to provide fixed support for the pressure plate. By adjusting the components to adjust the pressure plate and forcing the pressure plate to move downward to abut against each hollow plate, the hollow plates can be kept aligned in the plane when the steel strands tighten each hollow plate, so that the overall bridge structure has good structural strength and meets the expected service life in the design.

[0016] Optionally, the adjustment assembly is provided in two sets, and the two sets of adjustment assemblies are respectively disposed on the two side end faces of the upper fixed plate;

[0017] The adjustment assembly includes a side plate and a pushing component. The side plate is fixed to the side end face of the upper fixed plate, and the pushing component is connected to the side plate. The pushing component abuts against the pressure plate, and the axial direction of the pushing component is the same as the extension direction of the pressure plate.

[0018] A guide structure is provided between the upper fixed plate and the pressure plate. When the pushing component moves inward, the pressure plate moves downward through the guide structure and abuts against each hollow plate.

[0019] By adopting the above technical solution, and by setting up a jacking component, when the jacking component abuts against the pressure plate and moves inward, it can force the pressure plate to move downward through the guide structure, thereby abutting against each hollow plate and keeping the hollow plates aligned in the plane. Moreover, since the length of the pressure plate needs to match the lateral arrangement length of each hollow plate, and the length of the pressure plate is usually relatively long, by making the axial direction of the jacking component the same as the extension direction of the pressure plate, the force exerted by the jacking component on the pressure plate is the same as the extension direction of the pressure plate. This helps to reduce the possibility of deformation in the middle of the pressure plate, and can better abut against each hollow plate and force the hollow plates to remain aligned in the plane.

[0020] Optionally, the guide structure includes a first toothed portion disposed on the bottom surface of the upper fixed plate and a second toothed portion disposed on the top surface of the pressure plate, wherein the first toothed portion and the second toothed portion are matched and engaged for limiting.

[0021] By adopting the above technical solution, and by setting the first toothed part and the second toothed part, the first toothed part and the second toothed part can engage in normal operation. When the pushing component abuts against the pressure plate and forces the pressure plate to move laterally, the first toothed part and the second toothed part guide the pressure plate to gradually move downward while keeping it abutting against the upper fixed plate. The force of the pressure plate on each hollow plate gradually increases, which is beneficial for pressing and leveling each hollow plate.

[0022] Optionally, the tooth width of the first toothed portion gradually increases from the middle position of the first toothed portion to the two sides of the first toothed portion.

[0023] By adopting the above technical solution, since the tooth width of the first toothed part in the middle of the upper fixed plate is smaller than the tooth width of the first toothed parts on both sides of the upper fixed plate, when the pushing component abuts against the pressure plate and forces the pressure plate to move laterally, the downward feed amount in the middle of the pressure plate will be greater than the downward feed amount on both sides of the pressure plate. This can increase the abutting force of the middle of the pressure plate on the hollow plate below, overcome the insufficient abutting force of the middle of the pressure plate on the hollow plate below due to the deformation of the pressure plate itself, so as to force each hollow plate to remain flush in the plane.

[0024] Optionally, the limiting rod is hollow, and the second connecting member includes a double-ended stud and two locking nuts. The double-ended stud passes through the upper fixing plate, the limiting rod, and the reinforcing plate. One of the locking nuts is threaded to the double-ended stud and abuts against the side of the upper fixing plate away from the limiting rod, and the other locking nut is threaded to the double-ended stud and abuts against the side of the reinforcing plate away from the limiting rod.

[0025] By adopting the above technical solution, by passing the double-ended stud through the limiting rod and using two locking nuts to clamp and fix the reinforcing plate to the upper fixing plate, the connection stiffness between adjacent hollow plates can be further enhanced, thereby improving the overall structural strength of the bridge structure. In addition, the double-ended stud can also enhance the abutment and limiting of the reinforcing structure, and has the advantage of convenient connection, which facilitates the orderly progress of construction operations.

[0026] Optionally, the upper fixing plate is provided with a through first injection hole, and the pressure plate is provided with a through second injection hole.

[0027] By adopting the above technical solution, after the leveling mechanism flattens each hollow slab and keeps them on the same plane, concrete is poured onto the top of each hollow slab. The concrete enters the area between the upper fixed plate and the pressure plate through the first injection hole, and enters the gap between the pressure plate and the hollow slab through the second injection hole. After the concrete solidifies, a load-bearing concrete top slab can be formed.

[0028] Secondly, the reinforcement construction method provided in this application adopts the following technical solution:

[0029] A reinforcement construction method includes the following steps:

[0030] Step S1: Erect the bridge frame, support the formwork of the bridge frame, and pour concrete into the formwork to form a concrete base slab.

[0031] Step S2: According to the preset dimensions, multiple horizontal steel beams are arranged at equal intervals on the bottom surface of the concrete base slab. All horizontal steel beams are arranged at equal intervals along the length of the concrete base slab.

[0032] Step S3: Use the second connector to pre-fix the reinforcing plate to the horizontal steel beam and the concrete base plate, so that the two limiting rods on the reinforcing plate pass through to the top of the concrete base plate.

[0033] Step S4: Lay each hollow slab sequentially on top of the concrete base slab, ensuring that the first abutment of the hollow slab is located in the positioning area between the two limiting rods during laying, and that the second abutment of the adjacent hollow slab is also located in the positioning area between the two limiting rods; a pre-embedded nut is embedded at the bottom of the hollow slab.

[0034] Step S5: Connect each of the second connectors to the pre-embedded nuts above using threads.

[0035] Step S6: Thread the steel strands horizontally through each hollow slab and fix both ends of the steel strands to the horizontal steel beams respectively;

[0036] Step S7: Install the leveling mechanism above each hollow plate, and force the pressure plate to move downward and press against each hollow plate by adjusting the components;

[0037] Step S8: Pour concrete inside the hinge joint to form hinge joint concrete;

[0038] Step S9: Pour concrete on top of the hollow slab to form a concrete roof slab.

[0039] By adopting the above-mentioned technical solution, the constructed bridge structure can offset the vertical load from vehicles on the bridge through the abutment and unloading between the first and second abutment members, reducing the possibility of cracks forming in the hinge joint concrete. Furthermore, through the arc-shaped abutment between the first and second abutment members, and by utilizing the prestress of the steel strands, the lateral load on the bridge can be offset, thereby greatly reducing the possibility of cracks forming in the hinge joint concrete and cracks appearing at the bottom of the bridge, ensuring the safe use of the bridge and the safe passage of vehicles.

[0040] In summary, this application includes at least one of the following beneficial technical effects:

[0041] 1. By having the first and second abutting members of adjacent first and second steel structure plates alternately and sequentially abut and limit each other vertically, a reinforced structure can be formed. When the bridge is subjected to vertical loads from vehicles, the force relief between the adjacent first and second abutting members can effectively reduce the possibility of cracks forming in the hinge joint concrete and improve the shear strength of the entire bridge.

[0042] 2. By making the first and second abutting parts abut and limit each other in the form of arc abutting, the vertical load can be converted into a transverse load acting on the hinge joint concrete. Furthermore, the prestress of the steel strand and the converted transverse load can mutually and partially cancel each other out, thereby reducing the possibility of transverse cracking of the hinge joint concrete and greatly improving the structural strength of the hinge joint concrete.

[0043] 3. By setting an adjustment component, the force exerted by the jacking component of the adjustment component on the pressure plate is in the same direction as the extension of the pressure plate. This helps to reduce the possibility of deformation in the middle of the pressure plate, and can better support each hollow plate and force the hollow plates to keep in-plane alignment. As a result, the overall bridge structure has good structural strength and meets the expected service life in the design. Attached Figure Description

[0044] Figure 1 This is a cross-sectional view of the overall structure of the hollow slab bridge in this embodiment;

[0045] Figure 2 This is a schematic diagram of the contact between adjacent hollow plates in this embodiment;

[0046] Figure 3 This is a cross-sectional view of the hollow plate from another direction in this embodiment, mainly showing the connection relationship between the perforation and the steel strand;

[0047] Figure 4 yes Figure 1 Enlarged view of point A in the middle;

[0048] Figure 5 yes Figure 1 Enlarged view of point B in the middle;

[0049] Figure 6 yes Figure 1 Enlarged view of point C in the middle;

[0050] Figure 7 This is a partial cross-sectional view of the upper fixing plate and the pressure plate in this embodiment.

[0051] Explanation of reference numerals in the attached drawings: 1. First steel structure plate; 11. First abutting member; 2. Second steel structure plate; 21. Second abutting member; 3. Steel strand; 4. Horizontal steel beam; 41. Reinforcing plate; 42. First connecting member; 43. Limiting rod; 5. Leveling mechanism; 51. Upper fixing plate; 511. First toothed part; 512. First grouting hole; 513. Strip hole; 52. Press plate; 521. Second toothed part; 522. Second grouting hole; 523. Connecting column; 524. Anti-detachment block; 53. Adjustment component; 531. Side plate; 532. Pushing component; 6. Second connecting member; 61. Double-ended stud; 62. Locking nut; 7. Hollow plate; 71. Through hole; 72. Hinge joint concrete; 73. Embedded nut; 8. Concrete bottom plate; 9. Concrete top plate. Detailed Implementation

[0052] The following is in conjunction with the appendix Figure 1-7 This application will be described in further detail.

[0053] Example 1

[0054] This application discloses a reinforcement device for prestressed hollow slab bridges.

[0055] Reference Figure 1 A reinforcement device for a prestressed hollow slab bridge includes a first steel slab 1, a second steel slab 2, steel strands 3, a transverse steel beam 4, and a leveling mechanism 5. In this embodiment, the bridge structure is constructed by assembling multiple prefabricated hollow slabs 7 side by side. During construction, a formwork is first erected and concrete is poured to form a concrete base slab 8. Then, hollow slabs 7 are laid side by side on the surface of the concrete base slab 8, and concrete is poured into the hinge joints of adjacent hollow slabs 7 to form hinge joint concrete 72. Subsequently, the transverse steel beam 4 is fixed across the bottom of the concrete base slab 8, which can increase the vertical load on the bridge and enhance the overall shear strength of the bridge structure.

[0056] Reference Figure 2The first steel plate 1 and the second steel plate 2 are respectively fixed to the two sides of the hollow slab 7 by bolts. There are multiple first steel plates 1, and all the first steel plates 1 are equidistantly arranged along the length of the hollow slab 7. Multiple first abutment members 11 are provided on the side of the first steel plate 1 away from the hollow slab 7, and all the first abutment members 11 are spaced apart along the length of the first steel plate 1. There are multiple second steel plates 2, and all the second steel plates 2 are equidistantly arranged along the length of the hollow slab 7. Multiple second abutment members 21 are provided on the side of the second steel plate 2 away from the hollow slab 7, and all the second abutment members 21 are spaced apart along the length of the second steel plate 2.

[0057] After the adjacent hollow slabs 7 are laid, the first steel structure plate 1 fixed to one of the hollow slabs 7 can be positioned directly opposite the second steel structure plate 2 of the adjacent hollow slab 7. At this time, each of the first abutment members 11 and each of the second abutment members 21 can be alternately arranged vertically to form a reinforcement structure to offset the vertical load acting on the bridge structure. In addition, the outer surfaces of the first abutment members 11 and the second abutment members 21 are both arc-shaped. The arc surface of the first abutment member 11 can abut and limit each other with the arc surface of the second abutment member 21, and the vertical load is converted into a lateral load acting on the hinge joint concrete 72 by the arc surface abutment.

[0058] Back Figure 1 Multiple horizontal steel beams 4 are provided, all of which are equidistantly arranged along the length of the bridge structure, and the length of the horizontal steel beams 4 is perpendicular to the length of the hollow slab 7; at the same time, referring to Figure 3 The hollow plate 7 is provided with through holes 71 extending through both sides of the abdomen. The through holes 71 and the first abutting member 11 are offset along the length direction of the hollow plate 7. At the same time, the through holes 71 and the second abutting member 21 are also offset along the length direction of the hollow plate 7.

[0059] The steel strand 3 is threaded through the holes 71 of each hollow slab 7, and both ends of the steel strand 3 are fixedly installed. In this embodiment, the two ends of the steel strand 3 can be fixedly connected to the transverse steel beam 4, so that the steel strand 3 is always in a taut state, which can generate a force acting on the hollow slab 7 to force each hollow slab 7 to move closer to each other and press against each other. The prestress of the steel strand 3 can partially offset the decomposed transverse load, thereby reducing the possibility of transverse cracking of the hinge joint concrete 72.

[0060] Additionally, refer to Figure 4In this application, the horizontal steel beam 4 is made of I-beam. A reinforcing plate 41 is fixed to the inner top wall of the horizontal steel beam 4. Each reinforcing plate 41 is correspondingly positioned below the hinge joint formed between adjacent hollow slabs 7. Furthermore, two sets of first connecting members 42 are passed through and fixed to the reinforcing plate 41. In this embodiment, the first connecting member 42 can be one or more connecting bolts. The first connecting member 42 passes through the horizontal steel beam 4 and the concrete base slab 8, and is then connected and fixed to the hollow slabs 7. The two sets of first connecting members 42 are respectively connected to two hollow slabs 7, used to connect the hollow slabs 7 to form an integral structure, thereby improving the overall structural strength of the bridge structure.

[0061] Among them, the top surface of the reinforcing plate 41 is integrally formed with two limiting rods 43. Each limiting rod 43 is inserted through the horizontal steel beam 4 and the concrete base plate 8, thereby extending to the top of the concrete base plate 8. The two limiting rods 43 are spaced apart and together form a positioning area. The spacing of the positioning area is equal to the width of the first abutment 11 and also equal to the width of the second abutment 21.

[0062] During the laying of hollow slabs 7, by pre-connecting the reinforcing plate 41 to the concrete base slab 8, the limiting rod 43 can be partially positioned above the concrete base slab 8. By having the first abutting member 11 and the second abutting member 21 enter the positioning area together to form a reinforcing structure, the installation guidance and positioning of the hollow slab 7 can be facilitated. Moreover, the bottom surface of the hollow slab 7 is embedded with a pre-embedded nut 73. After the hollow slab 7 is installed, the first connecting member 42 of the reinforcing plate 41 is threadedly connected to the pre-embedded nut 73. At this time, the two limiting rods 43 abut against the two opposite sides of the reinforcing structure, which can reduce the possibility of longitudinal misalignment between adjacent hollow slabs 7 and reduce the possibility of transverse cracking of the hinge joint concrete 72 leading to cracks at the bottom of the bridge.

[0063] Back Figure 1 The leveling mechanism 5 is installed on top of each hollow slab 7 after they are laid. It is used to flatten each hollow slab 7 and keep them aligned in the plane, thereby ensuring that the assembled beam structure has good structural strength and meets the expected service life in the design. There are multiple sets of leveling mechanisms 5, all of which are equidistantly arranged along the length of the hollow slab 7, and each set of leveling mechanisms 5 is set on top of its respective reinforcement structure.

[0064] The leveling mechanism 5 includes an upper fixed plate 51, a pressure plate 52, and an adjustment component 53. Each reinforcing plate 41 is provided with a second connecting member 6 between itself and the upper fixed plate 51. The upper fixed plate 51 can be connected and fixed to each reinforcing plate 41 simultaneously through the second connecting member 6.

[0065] Specifically, refer to Figure 4 and Figure 5In this embodiment, the second connecting member 6 includes a double-ended stud 61 and two locking nuts 62. The limiting rod 43 is a hollow rod, and the reinforcing plate 41 has a through hole communicating with the interior of the limiting rod 43. The double-ended stud 61 is sequentially inserted into the upper fixing plate 51, the interior of the limiting rod 43, and the through hole of the reinforcing plate 41, with both ends of the double-ended stud 61 exposed on opposite sides of the upper fixing plate 51 and the reinforcing plate 41, respectively. One locking nut 62 is threaded to the top end of the double-ended stud 61 and abuts against the side of the upper fixing plate 51 away from the limiting rod 43; the other locking nut 62 is threaded to the bottom end of the double-ended stud 61 and abuts against the side of the reinforcing plate 41 away from the limiting rod 43. By clamping and fixing the reinforcing plate 41 and the upper fixing plate 51 with the two locking nuts 62, the upper fixing plate 51 can be kept firmly fixed.

[0066] Reference Figure 6 The pressure plate 52 is movably connected to the upper fixed plate 51 via a connecting structure, allowing the pressure plate 52 to slide laterally and move up and down relative to the upper fixed plate 51. Multiple sets of connecting structures are provided, all symmetrically distributed at the four corners of the upper fixed plate 51. Specifically, the connecting structure includes connecting posts 523 and slotted holes 513. The connecting posts 523 are vertically connected to the corners of the pressure plate 52 and are integrally formed with the pressure plate 52, while the slotted holes 513 are formed in the upper fixed plate 51 and extend through its upper and lower sides. The connecting post 523 passes through the strip hole 513 and can move within the strip hole 513, thereby causing the pressure plate 52 to slide laterally relative to the upper fixed plate 51. The axial length of the connecting post 523 is greater than the depth of the strip hole 513, which allows the pressure plate 52 to move up and down relative to the upper fixed plate 51. In addition, the end of the connecting post 523 is provided with an integrally formed anti-detachment block 524 to prevent the connecting post 523 from detaching from the strip hole 513.

[0067] Two sets of adjustment components 53 are provided, each set being disposed on one of the two side end faces of the upper fixed plate 51. Each adjustment component includes a side plate 531 and a pushing component 532. The side plate 531 is fixed to the side end face of the upper fixed plate 51 by bolts and is located outside the pressure plate 52. The pushing component 532 uses a tightening bolt and is threadedly connected to the side plate 531. The threaded end of the pushing component 532 can abut against the pressure plate 52, and the axial direction of the pushing component 532 is aligned with the extension direction of the pressure plate 52. Furthermore, a guide structure is provided between the upper fixed plate 51 and the pressure plate 52. When the pushing component 532 moves inward, forcing the pressure plate 52 to move laterally, the pressure plate 52 can move downward through the guide structure and abut against each hollow plate 7, ensuring that the hollow plates 7 remain aligned in the plane.

[0068] The guide structure includes a first toothed portion 511 integrally formed on the bottom surface of the upper fixing plate 51 and a second toothed portion 521 integrally formed on the top surface of the pressure plate 52. The first toothed portion 511 and the second toothed portion 521 are matched and engaged for positioning. In addition, the tooth width of the first toothed portion 511 gradually increases from the middle position of the first toothed portion 511 to both sides of the first toothed portion 511, and the tooth width at the middle position of the corresponding second toothed portion 521 will also be smaller than the tooth width at the middle position of the second toothed portion 521.

[0069] When the pushing component 532 forces the pressure plate 52 to move inward, the deformation of the pressure plate 52 at the middle position will be greater than that at the two sides of the pressure plate 52. This will enhance the abutting force of the pressure plate 52 at the middle position on the hollow plate 7 below, thereby overcoming the insufficient abutting force of the pressure plate 52 at the middle position on the hollow plate 7 below due to its own deformation, so as to force each hollow plate 7 to remain flush in the plane.

[0070] Additionally, refer to Figure 7 The upper fixing plate 51 is provided with multiple first injection holes 512 that run vertically through it, and all the first injection holes 512 are evenly distributed on the surface of the upper fixing plate 51; the pressure plate 52 is provided with multiple second injection holes 522 that run vertically through it, and the second injection holes 522 are evenly distributed on the surface of the pressure plate 52; after the leveling mechanism 5 presses and aligns each hollow plate 7, concrete is poured onto the surface of each hollow plate 7. The concrete enters the area between the upper fixing plate 51 and the pressure plate 52 through the first injection holes 512, and enters the gap between the pressure plate 52 and the hollow plate 7 through the second injection holes 522, which can wrap the upper fixing plate 51 and the pressure plate 52. After the concrete solidifies, it can form a load-bearing concrete top plate 9.

[0071] The implementation principle of the reinforcement device for a prestressed hollow slab bridge in this application embodiment is as follows:

[0072] After the hollow slabs 7 of this application are laid, the first abutting members 11 and the second abutting members 21 of two adjacent hollow slabs 7 alternately and sequentially abut and limit each other in the vertical direction to form a reinforced structure. When the bridge is subjected to vertical loads from vehicles, the abutting force between the first abutting member 11 and the second abutting member 21 can reduce the vertical load on the bridge structure as a whole, effectively reduce the possibility of longitudinal movement between adjacent hollow slabs 7, and thus reduce the possibility of cracks forming in the hinge joint concrete 72.

[0073] In addition, since the first abutting member 11 and the second abutting member 21 both abut and limit each other in the form of arc abutting, the vertical load can be converted into a lateral load acting on the hinge joint concrete 72; by the taut steel strand 3, the hollow slabs 7 are brought closer and pressed against each other, and the prestress of the steel strand 3 can partially offset the converted lateral load, thereby reducing the magnitude of the load transmitted to the inside of the bridge and reducing the possibility of two adjacent hollow slabs 7 moving in opposite directions and the hinge joint concrete 72 cracking laterally.

[0074] Therefore, the reinforcement device of this application can greatly improve the structural strength of the hinge joint concrete 72, reduce the possibility of cracks forming in the hinge joint concrete 72 and cracks appearing at the bottom of the bridge, so as to ensure the safe use of the bridge and the safe passage of vehicles.

[0075] Example 2

[0076] This application also discloses a reinforcement construction method.

[0077] A reinforcement construction method, based on the reinforcement device in Example 1, specifically includes the following steps:

[0078] Step S1: Erect the bridge frame, support the formwork of the bridge frame, and pour concrete into the formwork to form the concrete base slab 8.

[0079] Step S2: According to the preset dimensions, multiple horizontal steel beams 4 are equidistantly arranged on the bottom surface of the concrete base slab 8. All horizontal steel beams 4 are equidistantly arranged along the length of the concrete base slab 8.

[0080] Step S3: Use the second connector 6 to pre-fix the reinforcing plate 41 to the horizontal steel beam 4 and the concrete base plate 8, so that the two limiting rods 43 on the reinforcing plate 41 pass through to the top of the concrete base plate 8.

[0081] Step S4: Hollow slabs 7 are laid sequentially on the concrete base slab 8. During laying, the first abutment 11 of the hollow slab 7 is positioned in the positioning area between the two limiting rods 43, and the second abutment 21 of the adjacent hollow slab 7 is also positioned in the positioning area between the two limiting rods 43. The bottom of the hollow slab 7 is embedded with a pre-embedded nut 73. After fixing, each pre-embedded nut 73 is located above each first connector 42.

[0082] Step S5: Connect each first connector 42 to each pre-embedded nut 73 above with threads, so that each second connector 6 locks the corresponding reinforcing plate 41.

[0083] Step S6: Thread the steel strand 3 horizontally through each hollow slab 7, and fix both ends of the steel strand 3 to the horizontal steel beam 4 respectively.

[0084] Step S7: The leveling mechanism 5 is installed above each hollow plate 7, and the adjusting component 53 forces the pressure plate 52 to move downward and press against each hollow plate 7. Specifically, this includes:

[0085] S71, the upper fixing plate 51 is connected to each reinforcing plate 41 through the second connector 6. The double-headed stud 61 of the second connector 6 passes through the upper fixing plate 51, the limiting rod 43 and the reinforcing plate 41 in sequence, and then two locking nuts 62 are connected to the two ends of the double-headed stud 61. Each locking nut 62 can clamp and fix the reinforcing plate 41 to the upper fixing plate 51.

[0086] S72, adjust the pusher 532 on one side of the upper fixed plate 51. The pusher 532 forces the pressure plate 52 to move inward and shift downward, so that the pressure plate 52 presses against each hollow plate 7.

[0087] S73, adjust the pusher 532 on the other side of the upper fixed plate 51 so that the two pushers 532 together clamp the positioning pressure plate 52.

[0088] Step S8: Concrete is poured inside the hinge joint to form hinge joint concrete 72, which tightly wraps the limiting rod 43 and the reinforcement structure.

[0089] Step S9: Pour concrete on top of the hollow slab 7 to form a concrete top slab 9.

[0090] The above are preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made to the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A reinforcing device for a prestressed hollow slab bridge, characterized by: The reinforcing device comprises a first steel structure plate (1) and a second steel structure plate (2) fixed to the two sides of the hollow plate (7), the side surface of the first steel structure plate (1) is provided with a plurality of first abutting pieces (11), and the outer side surface of the first abutting piece (11) is arc-shaped, the side surface of the second steel structure plate (2) is provided with a second abutting piece (21), and the outer side surface of the second abutting piece (21) is arc-shaped. In the fixed state, each first abutting piece (11) and each second abutting piece (21) are vertically arranged alternately to form a reinforcing structure, and the arc surface of the first abutting piece (11) on the hollow plate (7) abuts against the arc surface of the second abutting piece (21) on the adjacent hollow plate (7) to limit the position. The reinforcing device further comprises a steel strand (3) penetrating through each hollow plate (7), and the two ends of the steel strand (3) are fixedly arranged, and the steel strand (3) is always in a tight state.

2. The reinforcement device of claim 1, wherein: The reinforcing device further comprises a horizontal steel beam (4) horizontally arranged at the bottom of each hollow plate (7), and a concrete bottom plate (8) is arranged between the horizontal steel beam (4) and the hollow plate (7); the length direction of the horizontal steel beam (4) is perpendicular to the length direction of the hollow plate (7), and a plurality of reinforcing plate pieces (41) are fixed to the horizontal steel beam (4), each reinforcing plate piece (41) is arranged below each hinge joint; the reinforcing plate piece (41) is provided with two groups of first connecting pieces (42), and the two groups of first connecting pieces (42) are used for connecting two adjacent hollow plates (7) respectively.

3. The reinforcement device of claim 2, wherein: The reinforcing plate piece (41) is provided with two limiting rod pieces (43), each limiting rod piece (43) penetrates through the horizontal steel beam (4) and extends above the concrete bottom plate (8); in the fixed state, the two limiting rod pieces (43) are respectively abutted to the two opposite side surfaces of the reinforcing structure.

4. The reinforcement device of claim 3, wherein: The reinforcing device further comprises a leveling mechanism (5) arranged above each hollow plate (7), and a plurality of leveling mechanisms (5) are arranged at intervals along the length direction of the hollow plate (7); The leveling mechanism (5) comprises an upper fixed plate (51), a flattening plate (52) and an adjusting assembly (53), the upper fixed plate (51) is connected and fixed with each reinforcing plate piece (41) through a second connecting piece (6); the flattening plate (52) is movably connected to the upper fixed plate (51), and the adjusting assembly (53) is located outside the flattening plate (52); the adjusting assembly (53) is used for forcing the flattening plate (52) to move downward and abut against each hollow plate (7).

5. The reinforcement device of claim 4, wherein: The adjusting assembly (53) is provided with two groups, and the two groups of adjusting assemblies (53) are respectively arranged at the two side end surfaces of the upper fixed plate (51); The adjusting assembly (53) comprises a side plate (531) and a pushing component (532), the side plate (531) is fixed to the side end surface of the upper fixed plate (51), and the pushing component (532) is connected to the side plate (531); the pushing component (532) abuts against the flattening plate (52), and the axis direction of the pushing component (532) is the same as the extension direction of the flattening plate (52); The upper fixed plate (51) and the flattening plate (52) are provided with a guide structure, when the pushing part (532) travels inward, the flattening plate (52) moves downward through the guide structure and abuts against each hollow slab (7).

6. The reinforcement device of claim 5, wherein: The guide structure comprises a first tooth-shaped part (511) arranged on the bottom surface of the upper fixed plate (51) and a second tooth-shaped part (521) arranged on the top surface of the flattening plate (52), the first tooth-shaped part (511) and the second tooth-shaped part (521) are matched and engaged to limit.

7. The reinforcement device of claim 6, wherein: The tooth width of the first tooth-shaped part (511) gradually increases from the middle position of the first tooth-shaped part (511) to the two side positions of the first tooth-shaped part (511).

8. The reinforcement device of claim 4, wherein: The limiting rod (43) is hollow, the second connecting piece (6) comprises a double-headed stud (61) and two locking nuts (62), the double-headed stud (61) is arranged in the upper fixed plate (51), the limiting rod (43) and the reinforcing plate (41); one of the locking nuts (62) is threadedly connected to the double-headed stud (61) and abuts against the side of the upper fixed plate (51) away from the limiting rod (43), the other locking nut (62) is threadedly connected to the double-headed stud (61) and abuts against the side of the reinforcing plate (41) away from the limiting rod (43).

9. The reinforcement device of claim 4, wherein: The upper fixed plate (51) is provided with a first pouring hole (512) penetrating through, and the flattening plate (52) is provided with a second pouring hole (522) penetrating through.

10. A method of reinforcing construction based on the reinforcing device according to any one of claims 4 to 9, characterized by, The method comprises the following steps: Step S1, erecting a bridge framework, supporting a formwork on the bridge framework, pouring concrete into the formwork to form a concrete bottom plate (8); Step S2, according to the preset size, arranging a plurality of horizontal steel beams (4) on the bottom surface of the concrete bottom plate (8) at equal intervals, and arranging all the horizontal steel beams (4) at equal intervals along the length direction of the concrete bottom plate (8); Step S3, using the second connecting piece (6) to pre-fix the reinforcing plate (41) to the horizontal steel beam (4) and the concrete bottom plate (8), so that the two limiting rods (43) on the reinforcing plate (41) are arranged above the concrete bottom plate (8); Step S4, sequentially laying each hollow slab (7) above the concrete bottom plate (8), so that the first abutting piece (11) of the hollow slab (7) is located in the positioning area between the two limiting rods (43), and the second abutting piece (21) of the adjacent hollow slab (7) is also located in the positioning area between the two limiting rods (43); the bottom of the hollow slab (7) is embedded with a pre-buried nut (73); Step S5, threadedly connecting each first connecting piece (42) with each pre-buried nut (73) above; Step S6, transversely arranging the steel strand (3) in each hollow slab (7), and fixing the two ends of the steel strand (3) to the horizontal steel beam (4); Step S7, installing the leveling mechanism (5) above each hollow slab (7), and forcing the flattening plate (52) to move downward and abut against each hollow slab (7) through the adjusting assembly (53); Step S8, pouring concrete in the hinge joint to form hinge joint concrete (72); Step S9, pouring concrete above the hollow slab (7) to form a concrete top plate (9).

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