Hollow slab bridge grading and reinforcing structure based on UHPC (Ultra High Performance Concrete)

Abstract

The utility model discloses a UHPC (Ultra High Performance Concrete)-based hollow slab bridge grading and reinforcing structure which comprises hollow slabs which are transversely arranged at intervals, the integrated pavement layer is arranged at the upper end of the hollow slab; the plate bottom reinforcing layer is arranged at the lower end of the hollow plate; the bridge deck slab reinforcing mesh is embedded in the integrated pavement layer; the plate bottom reinforcing layer reinforcing mesh is embedded in the plate bottom reinforcing layer; the upper end of the integral connecting steel bar is connected with the bridge floor steel bar mesh, and the lower end of the integral connecting steel bar is connected with the plate bottom reinforcing layer steel bar mesh; one end of the twisted steel located at the lower end of the hollow slab is connected with the hollow slab, and the other end of the twisted steel located at the upper end of the hollow slab is connected with the slab bottom reinforcing layer reinforcing mesh; wherein the template structure is poured and filled by UHPC (Ultra High Performance Concrete). The fabricated hollow slab bridge has the advantages of effectively improving the anti-bending bearing capacity, the structural safety and the durability of the fabricated hollow slab bridge.

Description

Technical Field

[0001] The utility model relates to the technical field of engineering, and in particular to a hollow slab bridge upgrading and reinforcement structure based on UHPC. Background Art

[0002] At present, due to its advantages of light weight and convenient construction, prefabricated hollow slab bridges are a type of small and medium span bridge structure that is widely used in the early stage of national construction and development. However, with the passage of time and the increase of vehicle loads, the hollow slab bridges that were widely used in the early stage have also shown more and more defects, mainly the following points:

[0003] Plate body defects: Compared with rigid structures such as T-beams and box beams, concrete solid plate beams often have obvious weaknesses in terms of stiffness and strength, and the overall stability of the entire plate beam mainly depends on the hinges between different plate beams. The structural disadvantage is that when faced with vehicles running under long-term overload, a single plate stress phenomenon will occur, and then there will be difficulties in the lateral distribution of the load. The concentrated load of the running vehicle is mainly borne by a single concrete plate beam, which will eventually cause strength fatigue of the plate beam, and obvious cracks in the web and bottom plate, and oblique cracks in the plate beam.

[0004] Hinge joint disease: Prestressed concrete hollow slab beams are mostly assembled, and the transverse connection between different hollow slabs is mainly hinged. The transverse connection does not bear bending moment, but only shear force. Hinge joint disease mainly manifests in the following forms: concrete loosens and falls off at the hinge joint; the overlying structure of the hinge joint breaks and causes water seepage, which leads to whitening and leakage at the hinge joint. Under the load of large and medium-sized vehicles, the damage of the hinge joint will cause the single hollow slab to be stressed, and the deflection and deformation of the slab will increase.

[0005] Bridge deck pavement defects: Potholes and cracks are the main manifestations of bridge deck pavement defects. The defects mainly occur near the hinge joints of the bridge deck concrete. When the lateral connection of the slab-beam superstructure is poor, the concrete strength is low, the hinge joint size is small, and the transverse connecting steel bars used in construction have large spacing and small diameters, the bridge deck potholes will appear. Under the impact of overloaded vehicles, fatigue damage occurs in the bridge deck concrete, resulting in longitudinal through cracks. Through cracks mainly appear near the hinge joints of the bridge deck.

[0006] Therefore, the insufficient bearing capacity of hollow slab bridges due to the above-mentioned defects is a difficult problem that urgently needs to be solved by engineering and technical personnel.

[0007] In the existing technology, the main method for the insufficient bearing capacity of hollow slab bridges in current projects is to reinforce the hollow slab bridges. The reinforcement methods mainly include bridge deck reinforcement layer reinforcement method, transverse steel plate reinforcement method, transverse prestressed reinforcement method, chemical grouting method, fiber material bonding method, etc. The above methods also have certain disadvantages and limitations for the reinforcement of hollow slab bridges. The transverse steel plate reinforcement method and the transverse prestressed reinforcement method can improve the structural stiffness but the improvement of the structural bearing capacity is not large. The fiber material bonding method has high requirements on the bonding quality and construction process. The bridge deck reinforcement layer reinforcement method has limited improvement on the structural bearing capacity and is not easy to maintain in the later stage.

[0008] In summary, there are the following technical problems:

[0009] The transverse steel plate reinforcement method and the transverse prestressed reinforcement method can improve the structural stiffness but have little effect on the structural bearing capacity;

[0010] The fiber material pasting method has high requirements on pasting quality and construction technology;

[0011] The bridge deck reinforcement layer reinforcement method has limited effect on improving the structural bearing capacity. Utility Model Content

[0012] The main purpose of the utility model is to provide a hollow slab bridge upgrading and reinforcement structure based on UHPC, so as to solve the technical problems in the prior art that the transverse steel plate reinforcement method and the transverse prestressed reinforcement method can improve the structural stiffness but have little effect on the structural bearing capacity; the fiber material bonding method has high requirements on the bonding quality and construction process; and the bridge deck reinforcement layer reinforcement method has limited improvement on the structural bearing capacity.

[0013] In order to achieve the above object, according to one aspect of the utility model, a UHPC-based hollow slab bridge upgrading and reinforcement structure is provided, comprising:

[0014] Hollow plates, the hollow plates are arranged at intervals in the transverse direction;

[0015] An integrated paving layer, wherein the integrated paving layer is arranged on the upper end of the hollow slab;

[0016] A slab bottom reinforcement layer, the slab bottom reinforcement layer being arranged at the lower end of the hollow slab;

[0017] A bridge deck steel mesh, wherein the bridge deck steel mesh is embedded in the integrated pavement layer;

[0018] A steel mesh for the slab bottom reinforcement layer, wherein the steel mesh for the slab bottom reinforcement layer is embedded in the slab bottom reinforcement layer;

[0019] Integrally connected steel bars, wherein the upper end of the integrally connected steel bars is connected to the steel mesh of the bridge deck, and the lower end of the integrally connected steel bars is connected to the steel mesh of the reinforcement layer at the bottom of the slab; and

[0020] Threaded steel bars, wherein one end of the threaded steel bars at the lower end of the hollow slab is connected to the hollow slab, and the other end is connected to the steel mesh of the slab bottom reinforcement layer, and one end of the threaded steel bars at the upper end of the hollow slab is connected to the hollow slab, and the other end is connected to the steel mesh of the bridge deck;

[0021] Among them, UHPC is used to cast and fill the formwork structure.

[0022] Preferably, there is a hinged joint structure between the hollow plates.

[0023] Preferably, original bottom plate steel bars are provided between the hollow plates near the bottom plate reinforcement layer.

[0024] Preferably, the hollow slabs are connected to each other via original hinged joints and steel bars.

[0025] Preferably, the interface between the hollow plate and the UHPC is kept clean and roughened.

[0026] Preferably, it also includes a chiseled portion, wherein the chiseled portion includes the original asphalt concrete pavement layer, the original reinforced concrete pavement layer and the original concrete of the hinged joint between the hollow slabs.

[0027] Preferably, both ends of the integrally connected steel bars are hook-shaped structures, one end of the integrally connected steel bars is hooked to the steel mesh of the bridge deck, and the other end is hooked to the steel mesh of the reinforcement layer at the bottom of the slab.

[0028] Preferably, the integrated paving layer and the bottom reinforcement layer are both UHPC casting layers.

[0029] Preferably, the integrated paving layer, hinged joint casting layer and plate lower reinforcement layer form an I-shaped structure.

[0030] Preferably, the UHPC integrates the pavement layer, the hollow slab, the hinged joint, and the slab bottom reinforcement layer into an integral structure.

[0031] The application of the technical solution of the utility model has the following technical effects:

[0032] By pouring ultra-high performance concrete (UHPC), which has super tensile and compressive strength, the load level of the prefabricated hollow slab bridge can be improved to adapt to the increasingly heavy traffic load. UHPC also has excellent toughness and can better absorb the kinetic energy during vehicle impact and prevent damage to the hinge joint, so it has a technical effect of good force-bearing performance.

[0033] Compared with ordinary concrete, ultra-high performance concrete has higher durability and stability. The integrated reinforcement layer made of ultra-high performance concrete also has better durability and stability, a long service life, and avoids later maintenance, so it has a highly durable technical effect.

[0034] Ultra-high performance concrete and ordinary concrete have excellent bonding properties when the interface is roughened and bonded. After the original structure of the bottom of the hollow slab is removed, pouring UHPC can repair the cracks at the bottom of the slab and thicken the bottom of the slab at the same time. The UHPC bridge deck pavement, UHPC hinged joint and slab bottom reinforcement layer have good integrity with the original structure and good stress performance, which can avoid cracking of the bridge structure at the hinged joint interface, and thus has a technical effect of good structural integrity.

[0035] The strength-to-mass ratio of ultra-high performance concrete is four times that of ordinary concrete, and it can provide higher strength per unit mass. This overcomes the problem that using ordinary concrete to expand the cross-section will cause most of the increased bearing capacity of the bridge to be used to offset the increased internal force of the constant load, resulting in poor reinforcement effect. Therefore, it has the technical effect of a high strength-to-mass ratio. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The drawings constituting part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0037] Figure 1 A schematic diagram of the cross-sectional structure in the length direction of the UHPC-based hollow slab bridge upgrading and reinforcement structure according to the utility model is shown;

[0038] Figure 2 Shows Figure 1 Schematic diagram of the cross-sectional structure in the width direction of the UHPC-based hollow slab bridge upgrading and reinforcement structure;

[0039] Figure 3 Shows Figure 1 Schematic diagram of the cross-sectional structure at the hinge joint of the UHPC-based hollow slab bridge upgrading and reinforcement structure.

[0040] The above drawings include the following reference numerals:

[0041] Hollow slab 1; integrated pavement layer 2; bottom plate 3; bottom reinforcement layer 4; top plate 5; chiseled portion 6; integral connecting steel bars 7; bridge deck steel mesh 8; original bottom plate steel bars 9; original hinged joint connecting steel bars 10; bottom reinforcement layer steel mesh 11; threaded steel bars 12. DETAILED DESCRIPTION

[0042] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present utility model will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0043] like Figures 1 to 3As shown, the embodiment of the utility model provides a UHPC-based hollow slab bridge upgrading and reinforcement structure, comprising: a hollow slab 1, wherein the hollow slab 1 is arranged at intervals in the horizontal direction; an integrated pavement layer 2, wherein the integrated pavement layer 2 is arranged at the upper end of the hollow slab 1; a slab bottom reinforcement layer 4, wherein the slab bottom reinforcement layer 4 is arranged at the lower end of the hollow slab 1; a bridge deck steel mesh 8, wherein the bridge deck steel mesh 8 is embedded in the integrated pavement layer 2; a slab bottom reinforcement layer steel mesh 11, wherein the slab bottom reinforcement layer steel mesh 11 is embedded in the slab bottom reinforcement layer Layer 4; integrally connected steel bars 7, the upper ends of the integrally connected steel bars 7 are connected to the bridge deck steel mesh, and the lower ends of the integrally connected steel bars 7 are connected to the slab bottom reinforcement layer steel mesh 11; and threaded steel bars 12, the threaded steel bars 12 located at the lower end of the hollow slab 1, one end of which is connected to the hollow slab 1, and the other end of which is connected to the slab bottom reinforcement layer steel mesh 11; the threaded steel bars 12 located at the upper end of the hollow slab 1, one end of which is connected to the hollow slab 1, and the other end of which is connected to the bridge deck steel mesh 8; wherein a UHPC casting filling formwork structure is adopted.

[0044] In this embodiment, the hollow slabs 1 are used to form a bridge deck structure. The hollow slabs 1 are arranged at intervals in the horizontal direction. A plurality of hollow slabs 1 are arranged in the horizontal direction to form a bridge deck support. There is a hinged joint structure between the hollow slabs 1. The hinged joint structure is used to fill concrete and set a steel skeleton. The original bottom slab steel bars 9 are arranged near the bottom reinforcement layer 4 between the hollow slabs 1. The hollow slabs 1 are connected by the original hinged joint connecting steel bars 10. The purpose of setting the original bottom slab steel bars 9 and the original hinged joint connecting steel bars 10 is to fix and connect adjacent hollow slabs 1.

[0045] In this embodiment, the integrated pavement layer 2 includes a top plate 5, and the bottom reinforcement layer 4 includes a bottom plate 3. The top plate 5 and the bottom plate 3 jointly sandwich a hollow plate 1. The top plate 5 is arranged at the upper end of the hollow plate 1. The bottom plate 3 and the top plate 5 jointly sandwich the hollow plate 1. The top plate 5 is used to form a planar structure at the upper end of the hollow plate 1. Under the action of heavy load, it is convenient to realize that several hollow plates 1 are subjected to force at the same time. The bottom plate 3 plays a role of supporting several hollow plates 1 to prevent any hollow plate 1 from moving downward at the pressure concentration point. The bottom plate 3 is arranged at the lower end of the hollow plate 1.

[0046] In this embodiment, the integrated paving layer 2 is used to support and reinforce the upper layer, and the integrated paving layer 2 is arranged at the upper end of the top plate 5. The bottom reinforcement layer 4 is used to support and reinforce the lower layer, and the bottom reinforcement layer 4 is arranged at the lower end of the bottom plate 3. The integrated paving layer 2 and the bottom reinforcement layer 4 are both UHPC casting layers. The integrated paving layer 2, the hinged joint casting layer and the bottom reinforcement layer of the plate form an I-shaped structure, which is more stable and has a better bearing effect.

[0047] In this embodiment, the bridge deck steel mesh 8 serves to reinforce the upper layer. The bridge deck steel mesh 8 is embedded in the integrated pavement layer 2. The threaded steel bars 12 fix the hollow slab 1 and the bridge deck steel mesh 8, playing the role of a skeleton, forming a combined force, and the reinforcement effect is better. The bridge deck steel mesh 8 in the UHPC bridge deck pavement layer is connected to the longitudinal steel bars of the top plate 5 of the hollow slab 1. It can also be connected by planting steel bars in the top plate 5 of the hollow slab 1, and then tying the pavement layer steel mesh and the top plate 5 of the hollow slab 1 together.

[0048] In this embodiment, the bottom reinforcement layer steel mesh 11 is used to reinforce the lower layer and plays the role of a skeleton. The bottom reinforcement layer steel mesh 11 is embedded in the bottom reinforcement layer 4. The integral connection steel bar 7 is used for vertical reinforcement to form a vertical skeleton. The upper end of the integral connection steel bar 7 is connected to the bridge deck steel mesh, and the lower end of the integral connection steel bar 7 is connected to the bottom reinforcement layer steel mesh 11; the two ends of the integral connection steel bar 7 are hook-shaped structures, one end of the integral connection steel bar 7 is hooked to the bridge deck steel mesh 8, and the other end is hooked to the bottom reinforcement layer steel mesh 11. The integral connection steel bar 7 is tied together with the bridge deck steel mesh 8 and the bottom reinforcement layer steel mesh 11. The threaded steel bar 12 fixes the hollow slab 1 and the bottom reinforcement layer steel mesh 11. One end of the threaded steel bar 12 is connected to the hollow slab 1, and the other end is connected to the bottom reinforcement layer steel mesh 11; the UHPC casting filling formwork structure is adopted, and the interface between the hollow slab 1 and the UHPC is kept clean and roughened. Specifically, the UHPC casting part and the slab-beam joint surface should be chiseled to remove the floating surface of the original structure, so that the aggregate is exposed, forming a natural concave-convex rough surface or using mechanical grooves to form a rough surface, and it should be thoroughly cleaned. The UHPC will form an integral structure with the integrated paving layer 2, hollow slab 1, hinged joint, and slab bottom reinforcement layer 4. The replacement UHPC will fill the hollowed-out top slab 5 and hinged joint of the original hollow slab 1, and the main bending section in the mid-span will be enlarged, that is, the vertical part of the I-shaped structure is an enlarged section structure.

[0049] This embodiment also includes a chiseled portion 6, which includes the original asphalt concrete pavement layer, the original reinforced concrete pavement layer and the original concrete of the hinged joint between the hollow slab 1. The original concrete is chiseled away and reinforced using the reinforcement structure of this patent.

[0050] Construction steps:

[0051] Step 1: Chisel off and roughen the old bridge deck pavement. First, chisel off the original bridge deck pavement, that is, chisel off the original asphalt concrete pavement layer and reinforced concrete pavement layer until the top of the slab beam, and clean it up. Take safety measures when chiseling to prevent damage to the hollow slab 1.

[0052] Step 2: Chisel out and treat the hinge joint. Chisel out the concrete in the hinge joint of hollow slab 1 and chisel downward to form a through hole, retain the existing bottom steel bars of hollow slab 1, completely remove the concrete between hollow slabs 1, and chisel it rough. When chiseling, retain the connecting steel bars at the hinge joint.

[0053] Step 3: Roughen the surface of the bottom plate 3 and clean it.

[0054] Step 4: Embed reinforcement on the joint surface of the hollow slab: Use threaded steel bars 12 to embed reinforcement on the top and bottom of the existing hollow slab 1.

[0055] Step 5: Install the base plate 3 reinforcement layer formwork.

[0056] Step 6: Arrange the steel mesh 11 of the bottom reinforcement layer of the slab.

[0057] Step 7: Arrange the bridge deck reinforcement mesh 8.

[0058] Step 8: Arrange the integral connecting steel bars 7.

[0059] Step 9: Finally, use UHPC to pour and cure the formwork, hinged joints and integrated pavement layer 2 concrete, and remove the formwork after curing.

[0060] Specifically, the upgrading and reinforcement method of the present invention involves an integrated bridge deck pavement layer, a hollow slab 1, a bottom reinforcement layer 4 and a replacement UHPC. The interface between the existing hollow slab 1 and the UHPC is cleaned and roughened to ensure that the bonding performance of each UHPC\NC interface is excellent, and the bridge deck pavement layer, the hollow slab 1, the hinge joint, and the bottom reinforcement layer 4 are formed into a whole and work together.

[0061] The specific implementation steps are as follows: chisel off the existing bridge deck pavement layer until the top plate 5, and clean it up. When chiseling out, take safety measures to prevent damage to the hollow plate 1. Chisel off the concrete in the original hollow plate 1 and chisel downwards. Chisel off part 6 of the bottom plate 3 to form a through hole, exposing part of the bottom steel bars of the original hollow plate 1. Figure 2 , 3As shown; retain the original steel bars of the hinge joint when chiseling, thoroughly remove the concrete between the hollow slabs 1, and chisel rough, chisel rough and clean the surface of the bottom plate 3, the chiseled joint surface should remove the floating of the original structure surface to expose the aggregate, form a natural concave and convex rough surface or use mechanical grooving to form a rough surface, and thoroughly clean, arrange the bridge deck pavement layer steel bars, and plant steel bars on the bottom joint surface: use threaded steel bars 12 to plant steel bars on the top and bottom of the existing hollow slab 1, hoist the template of the bottom reinforcement layer 4, arrange the bottom reinforcement layer steel mesh 11, arrange the integral connecting steel bars 7, and tie them together with the bridge deck steel mesh 8 and the bottom reinforcement layer steel mesh 11, finally use UHPC to cast and fill the bottom reinforcement layer 4, hinged joint and integrated paving layer 2 and maintain, and remove the template after maintenance; when the existing bridge deck pavement, hinged joint and part of the bottom plate 3 are chiseled out of the hollow slab 1, the original steel bars are retained. The steel mesh in the UHPC bridge deck pavement layer is connected to the longitudinal steel bars of the hollow slab 1 top plate 5. It can also be connected by planting steel bars in the top plate 5 of the hollow slab 1 and then tying the steel mesh in the pavement layer to the planted steel bars of the hollow slab 1 top plate 5 together.

[0062] From the above description, it can be seen that the above embodiments of the utility model achieve the following technical effects:

[0063] By pouring ultra-high performance concrete UHPC, which has super tensile and compressive strength, the load level of the prefabricated hollow slab bridge can be improved to adapt to the increasingly heavy traffic load. UHPC also has excellent toughness and can better absorb the kinetic energy during vehicle impact and prevent damage to the hinge joint, so it has a technical effect of good force-bearing performance.

[0064] Compared with ordinary concrete, ultra-high performance concrete has higher durability and stability. The integrated reinforcement layer made of ultra-high performance concrete also has better durability and stability, a long service life, and avoids later maintenance, so it has a highly durable technical effect.

[0065] Ultra-high performance concrete and ordinary concrete have excellent bonding properties when the interface is roughened and bonded, and pouring UHPC after removing the original structure of the bottom part of the hollow slab 1 can repair the cracks at the bottom of the slab and thicken the bottom of the slab; the use of UHPC bridge deck pavement, UHPC hinged joint and slab bottom reinforcement layer 4 has good integrity with the original structure and good stress performance, avoiding cracking of the bridge structure at the hinged joint interface, and thus has a technical effect of good structural integrity.

[0066] The strength-to-mass ratio of ultra-high performance concrete is four times that of ordinary concrete, and it can provide higher strength per unit mass. This overcomes the problem that using ordinary concrete to expand the cross-section will cause most of the increased bearing capacity of the bridge to be used to offset the increased internal force of the constant load, resulting in poor reinforcement effect. Therefore, it has the technical effect of a high strength-to-mass ratio.

[0067] The above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. For those skilled in the art, the utility model may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A UHPC-based hollow slab bridge upgrading and reinforcement structure, characterized in that: It comprises hollow plates, wherein the hollow plates are arranged at intervals in the transverse direction; An integrated paving layer, wherein the integrated paving layer is arranged on the upper end of the hollow slab; A slab bottom reinforcement layer, the slab bottom reinforcement layer being arranged at the lower end of the hollow slab; A bridge deck steel mesh, wherein the bridge deck steel mesh is embedded in the integrated pavement layer; A steel mesh for the slab bottom reinforcement layer, wherein the steel mesh for the slab bottom reinforcement layer is embedded in the slab bottom reinforcement layer; Integrally connected steel bars, wherein the upper end of the integrally connected steel bars is connected to the steel mesh of the bridge deck, and the lower end of the integrally connected steel bars is connected to the steel mesh of the reinforcement layer at the bottom of the slab; and Threaded steel bars, wherein one end of the threaded steel bars at the lower end of the hollow slab is connected to the hollow slab, and the other end is connected to the steel mesh of the slab bottom reinforcement layer, and one end of the threaded steel bars at the upper end of the hollow slab is connected to the hollow slab, and the other end is connected to the steel mesh of the bridge deck; Among them, UHPC is used to cast and fill the formwork structure.

2. The UHPC-based hollow slab bridge upgrading and reinforcement structure according to claim 1, characterized in that: There is a hinged joint structure between the hollow plates.

3. The UHPC-based hollow slab bridge upgrading and reinforcement structure according to claim 1, characterized in that: Original bottom plate reinforcements are arranged between the hollow plates near the bottom plate reinforcement layer.

4. The UHPC-based hollow slab bridge upgrading and reinforcement structure according to claim 1, characterized in that: The hollow slabs are connected to each other through the original hinged joint connecting steel bars.

5. The UHPC-based hollow slab bridge upgrading and reinforcement structure according to claim 1, characterized in that: The interface between the hollow plate and the UHPC is kept clean and roughened.

6. The UHPC-based hollow slab bridge upgrading and reinforcement structure according to claim 1, characterized in that: It also includes a chiseled portion, which includes the original asphalt concrete pavement layer, the original reinforced concrete pavement layer and the original concrete of the hinged joint between the hollow slabs.

7. The UHPC-based hollow slab bridge upgrading and reinforcement structure according to claim 1, characterized in that: Both ends of the integrally connected steel bar are hook-shaped structures. One end of the integrally connected steel bar is hooked with the steel mesh of the bridge deck, and the other end is hooked with the steel mesh of the reinforcement layer at the bottom of the slab.

8. The UHPC-based hollow slab bridge upgrading and reinforcement structure according to claim 1, characterized in that: The integrated paving layer and the bottom reinforcement layer of the slab are both UHPC casting layers.

9. The UHPC-based hollow slab bridge upgrading and reinforcement structure according to claim 1, characterized in that: The integrated paving layer, hinged joint casting layer and plate bottom reinforcement layer form an I-shaped structure.

10. The UHPC-based hollow slab bridge upgrading and reinforcement structure according to claim 1, characterized in that: The UHPC integrates the pavement layer, the hollow slab, the hinged joint, and the slab bottom reinforcement layer into an integral structure.

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