Combined prestressed hollow slab for bridge

Abstract

The utility model relates to the technical field of bridge hollow slabs, and discloses a combined prestressed hollow slab for a bridge, which comprises a trapezoidal prefabricated hollow slab, I-shaped steel beams are fixedly connected to the front side and the rear side of the bottom of the trapezoidal prefabricated hollow slab, and mounting components are arranged on the left side and the right side of the bottom of each I-shaped steel beam. Hoisting assemblies are arranged on the left sides and the right sides of the tops of the I-shaped steel beams correspondingly, a plurality of reinforcing rods are fixedly connected to the adjacent sides of the two I-shaped steel beams correspondingly, and tensioning mechanisms are arranged at the front ends and the rear ends of the reinforcing rods correspondingly. The reinforcing rods are positioned and installed through the limiting holes, the connecting plates connect the reinforcing rods, the adjusting nuts are rotated, the inclined plates are extruded to move inwards along the limiting rods, the connecting plates on the two sides move away from each other under the inclination action of the trapezoidal plates, and therefore a firm state is formed at the bottom of the trapezoidal prefabricated hollow slab. And the tensile stress can be effectively counteracted.

Description

Technical Field

[0001] This utility model relates to the field of bridge hollow slab technology, and in particular to a composite prestressed hollow slab for bridges. Background Technology

[0002] In the field of bridge engineering, composite prestressed hollow slabs are widely used due to their advantages of being lightweight, having high load-bearing capacity, and being easy to construct. These hollow slabs typically adopt a structural form that combines prestressed main beam units with hollow modules. During construction, adjacent hollow modules are filled with epoxy resin mortar or cast-in-place concrete layers to form a whole. Lateral loads are transferred through connecting keys or local prestressing structures. This structure uses prestressing technology to offset external load deflection and is suitable for the construction of small and medium span bridges. Furthermore, the modular design facilitates prefabrication and on-site assembly, which has significant advantages in improving construction efficiency and reducing on-site wet work.

[0003] A search revealed Chinese Patent Publication No. CN222632030U, which discloses a precast hollow slab beam reinforcement structure. This utility model includes: a slab beam body, which is a precast hollow slab beam formed by a steel reinforcement skeleton and concrete pouring; a reinforcement groove, which is formed on the upper surface of the slab beam body, with an insert block at the bottom of the groove and pre-reserved steel bars on the upper surface of the insert block. These pre-reserved steel bars are integral with the steel reinforcement skeleton on the slab beam body. This utility model allows for the insertion of a reinforcement plate into the reinforcement groove after the hinge joint, ensuring proper connection between the insert and the reinforcement. The fixed holes are inserted into the insert block and the threaded column respectively. The nuts are tightened on the top of the threaded column to reinforce the reinforcing plate. After completion, concrete is added to the reinforcing groove to cover the reinforcing plate and smoothed. After it is completely solidified, the construction of the overall reinforcing structure is completed. This strengthens the horizontal stress bearing capacity, improves the strength of the hollow slab beam connection, and reduces the impact on bridge traffic and structural safety. However, in actual use, steel beams are only used to increase the strength of the hollow slab in the transverse direction, but the longitudinal direction is not better reinforced, which leads to uneven prestress in the middle of the hollow slab. Utility Model Content

[0004] To overcome the above shortcomings, this utility model provides a composite prestressed hollow slab for bridges, which aims to improve the problem that the existing technology only uses steel beams to increase the strength of the hollow slab in the transverse direction, but does not provide better reinforcement in the longitudinal direction.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a composite prestressed hollow slab for bridges, comprising a trapezoidal precast hollow slab, wherein I-beams are fixedly connected to the front and rear sides of the bottom of the trapezoidal precast hollow slab, installation components are provided on the left and right sides of the bottom of the I-beams, hoisting components are provided on the left and right sides of the top of the I-beams, multiple reinforcing rods are fixedly connected to adjacent sides of two I-beams, tensioning mechanisms are provided at the front and rear ends of the multiple reinforcing rods, pre-tensioning components are provided on the front and rear sides of the interior of the trapezoidal precast hollow slab, the pre-tensioning components are used to strengthen the transverse prestress of the trapezoidal precast hollow slab, splicing reinforcement components are provided on the left and right sides of the trapezoidal precast hollow slab, and an assembly mechanism is provided on the outer wall of the reinforcing rods;

[0006] The tensioning mechanism includes multiple limiting holes, the outer walls of which are respectively opened into the inner wall of the I-shaped steel beam. The front and rear ends of the multiple reinforcing rods penetrate the inner wall of the corresponding I-shaped steel beam and are fixedly connected to connecting plates. A limiting strip is opened on the front top side of the I-shaped steel beam. A trapezoidal plate is slidably connected to the inner wall of the limiting strip. Limiting recesses are opened on the left and right sides of the bottom of the trapezoidal plate. Extrusion components are provided on the front and rear sides of the trapezoidal precast hollow slab.

[0007] Through the above technical solution: the trapezoidal precast hollow slab serves as the core load-bearing component, and the limiting holes provide positioning and installation holes for the reinforcing rods. The connecting plates connect multiple reinforcing rods to make the reinforcing rods rigidly connected to the steel beams. When the trapezoidal slab moves, the connecting plates on both sides will move apart under its tilting action, thereby making the reinforcing rods taut. This results in a solid bottom of the trapezoidal precast hollow slab that can offset tensile stress.

[0008] As a further description of the above technical solution:

[0009] The assembly mechanism includes multiple hollow hexagonal blocks. The inner walls of the multiple hollow hexagonal blocks are respectively located on the front side of the outer wall of the reinforcing rod. A positioning block is fixedly connected to the inner wall of the hollow hexagonal blocks. Multiple hollow reinforcing blocks are provided in the middle of the outer wall of the reinforcing rod. A slotted hollow hexagonal block is provided on the rear side of the outer wall of the reinforcing rod. A limit cylinder is fixedly connected to the inner wall of the slotted hollow hexagonal block. Fixing components are provided on both the front and rear sides of the outer wall of the reinforcing rod.

[0010] The above technical solution involves selecting the required number of hollow reinforcing blocks based on the width of different trapezoidal precast hollow slabs, and mortising them end to end. Hollow hexagonal clips and slotted hollow hexagonal blocks are then mortised onto both ends of the assembled hollow reinforcing blocks. These blocks are then fitted onto the outside of the reinforcing rod and, under the action of the positioning block and the limiting cylinder, are engaged with the outside of the reinforcing rod. Finally, hollow clamping cylinders are fitted onto the inner walls of the hollow hexagonal clips and slotted hollow hexagonal blocks, thereby further improving the strength of the reinforcing rod.

[0011] As a further description of the above technical solution:

[0012] The extrusion assembly includes multiple limiting rods, which are respectively fixedly connected to the front and rear sides of the trapezoidal precast hollow slab. The outer walls of the two limiting rods on the left and right sides are slidably connected to inclined plates, and the outer walls of the limiting rods are threadedly connected to adjusting nuts.

[0013] Through the above technical solution: rotating the adjusting nut can squeeze the inclined plate to move inward along the limiting rod, and due to the inclined characteristics of the inclined plate surface, it will squeeze the trapezoidal plate to move to the bottom.

[0014] As a further description of the above technical solution:

[0015] The fixing assembly includes two hollow clamping cylinders, the inner walls of which are respectively disposed on the front and rear sides of the outer wall of the reinforcing rod, and the outer walls of the hollow clamping cylinders are threaded with compression nuts.

[0016] The above technical solution involves rotating the compression nut to compress and clamp the hollow clamping cylinder above the reinforcing rod, and the compression nut can restrict the movement of the assembled reinforcement mechanism.

[0017] As a further description of the above technical solution:

[0018] The pre-tensioning component includes multiple limiting grooves, which are respectively opened on the left and right sides of the trapezoidal precast hollow slab. A limiting disc is provided on the inner wall of the limiting groove, and the outer wall of the limiting disc engages with the inner wall of the limiting groove. Multiple steel cables are provided on the inner wall of the limiting disc, and conical limiting blocks are provided on the left and right sides of the outer wall of the steel cables. The outer walls of the multiple conical limiting blocks engage with the inner wall of the limiting disc.

[0019] Through the above technical solution: when the trapezoidal precast hollow slab is subjected to lateral tensile stress, the steel cable transmits the tension to the limiting plate through the conical limiting block, which is then converted into lateral pre-compression stress on the trapezoidal precast hollow slab, thus inhibiting crack propagation.

[0020] As a further description of the above technical solution:

[0021] The mounting assembly includes multiple positioning rods, and the outer walls of the multiple mounting assemblies are respectively disposed on the left and right sides of the bottom inner wall of the I-shaped steel beam. The outer walls of the positioning rods are engaged with the bottom inner wall of the I-shaped steel beam, and a fixing nut is threaded to the top of the outer wall of the positioning rod.

[0022] The above technical solution involves engaging the conical limiting block with the limiting disc to tighten the steel cable, thereby generating lateral prestress and counteracting the tensile stress under load.

[0023] As a further description of the above technical solution:

[0024] The splicing and reinforcement assembly includes multiple connecting rods. The outer walls of the multiple connecting rods are respectively fixedly connected to the top left and right sides of the trapezoidal precast hollow slab. I-shaped connecting blocks are fixedly connected to the outer walls of the multiple connecting rods on the left and right sides. Multiple toothed blocks are fixedly connected to the outer walls of the I-shaped connecting blocks on the left and right sides.

[0025] Through the above technical solution: after the epoxy resin mortar is poured into the joint, the toothed block provides mechanical interlocking force, the web of the I-shaped connecting block bears shear force, and the flange resists bending moment, forming a composite force transmission path.

[0026] As a further description of the above technical solution:

[0027] The hoisting assembly includes multiple limiting slots, the outer walls of which are respectively opened at the four corners of the top of the I-shaped steel beam. The inner walls of the limiting slots are provided with T-shaped holes, the outer walls of which engage with the inner walls of the limiting slots. Limiting bolts are provided on the front and rear sides of the top of the I-shaped steel beam, the outer walls of which respectively penetrate the I-shaped steel beam and are threadedly connected to the inner walls of the corresponding T-shaped holes.

[0028] The above technical solution allows for the following: during lifting, the hook passes through the horizontal channel of the T-shaped perforated block, and the load is transferred to the steel beam through bolts. The horizontal flange of the T-shaped perforated block increases the bearing area, thus avoiding localized concrete pressure damage.

[0029] This utility model has the following beneficial effects:

[0030] 1. In this utility model, the reinforcing rod is positioned and installed through the limiting hole, and the connecting plate connects multiple reinforcing rods to achieve a rigid connection with the steel beam. By rotating the adjusting nut, the inclined plate can be squeezed to move inward along the limiting rod. Due to its surface characteristics, the inclined plate squeezes the trapezoidal plate to move to the bottom. Under the inclination of the trapezoidal plate, the connecting plates on both sides move apart, thereby putting the reinforcing rod in a taut state, thus forming a solid state at the bottom of the trapezoidal precast hollow slab, which can effectively offset the tensile stress.

[0031] 2. In this utility model, by selecting an appropriate number of hollow reinforcing blocks, connecting the first and last ends with tenon joints, and connecting the two ends with hollow hexagonal clips and slotted hollow hexagonal blocks respectively, the assembled structure is fitted onto the outside of the reinforcing rod and fixed by positioning blocks and limiting cylinders. Then, the hollow clamping cylinder is fitted onto the inner wall of the hollow hexagonal clips and slotted hollow hexagonal blocks, and the compression nut is rotated to clamp the reinforcing rod. The compression nut restricts its movement and enhances the stability of the reinforcing rod. Attached Figure Description

[0032] Figure 1 This is a perspective view of a composite prestressed hollow slab for bridges proposed in this utility model;

[0033] Figure 2 This is a front view of a composite prestressed hollow slab for bridges proposed in this utility model;

[0034] Figure 3 This is a side view of a composite prestressed hollow slab for bridges proposed in this utility model;

[0035] Figure 4 This is a split view of an I-beam of a composite prestressed hollow slab for bridges proposed in this utility model.

[0036] Figure 5 This is a disassembled view of the assembly component of a combined prestressed hollow slab for bridges proposed in this utility model;

[0037] Figure 6 This is an exploded view of the hoisting assembly for a combined prestressed hollow slab used in bridges, as proposed in this utility model.

[0038] Legend:

[0039] 1. Trapezoidal precast hollow slab; 2. Tensioning mechanism; 201. Limiting hole; 202. Connecting plate; 203. Limiting strip; 204. Trapezoidal plate; 205. Limiting notch; 206. Extrusion assembly; 2061. Limiting rod; 2062. Inclined plate; 2063. Adjusting nut; 3. Assembly mechanism; 301. Hollow hexagonal clamping block; 302. Positioning block; 303. Hollow reinforcing block; 304. Limiting cylinder; 305. Fixing assembly; 3051. Hollow clamping cylinder; 3052. 306. Extruded nut; 4. Hollow hexagonal block with slot; 5. I-beam; 6. Reinforcing rod; 7. Pre-tensioning assembly; 8. Limiting groove; 9. Limiting disc; 10. Steel cable; 11. Conical limiting block; 12. Installation assembly; 13. Positioning rod; 14. Fixing nut; 15. Splicing reinforcement assembly; 16. Connecting rod; 17. I-shaped connecting block; 18. Toothed block; 19. Lifting assembly; 10. Limiting groove; 11. T-shaped hole block; 12. Limiting bolt. Detailed Implementation

[0040] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0041] Reference Figure 2 , Figure 3 and Figure 4This utility model provides an embodiment of a composite prestressed hollow slab for bridges, comprising a trapezoidal precast hollow slab 1. I-beams 4 are fixedly connected to the front and rear sides of the bottom of the trapezoidal precast hollow slab 1. The I-beams 4 bear the main bending moment, their flanges provide bending stiffness, and their webs resist shear force. Installation components 7 are provided on the left and right sides of the bottom of the I-beams 4, and hoisting components 9 are provided on the left and right sides of the top of the I-beams 4. Multiple reinforcing rods 5 are fixedly connected to adjacent sides of two I-beams 4, forming a lateral support system that suppresses lateral deformation of the trapezoidal precast hollow slab 1 and evenly transfers the load to the I-beams 4. The front and rear ends of the multiple reinforcing rods 5 are equipped with... The trapezoidal precast hollow slab 1 has a tensioning mechanism 2. Pre-tensioning components 6 are installed on both the front and rear sides of the slab. These components strengthen the lateral prestress of the trapezoidal precast hollow slab 1 and can counteract tensile stress under load, improving the slab's crack resistance. Splicing reinforcement components 8 are installed on both the left and right sides of the trapezoidal precast hollow slab 1. An assembly mechanism 3 is installed on the outer wall of the reinforcing rod 5. The tensioning mechanism 2 includes multiple limiting holes 201, the outer walls of which are respectively opened on the inner wall of the I-beam 4. These limiting holes 201 provide positioning and installation holes for the reinforcing rod 5. The front and rear ends of the reinforcing rod 5 penetrate the corresponding inner wall of the I-beam 4 and are fixedly connected to connecting plates 202. Multiple reinforcing rods 5 are connected together to rigidly connect the reinforcing rods 5 to the steel beam. A limit strip 203 is provided on the top front side of the I-beam steel beam 4. A trapezoidal plate 204 is slidably connected to the inner wall of the limit strip 203. Limiting notches 205 are provided on the left and right sides of the bottom of the trapezoidal plate 204. Extrusion components 206 are provided on the front and rear sides of the trapezoidal precast hollow slab 1. The extrusion component 206 includes multiple limiting rods 2061, which are fixedly connected to the front and rear sides of the trapezoidal precast hollow slab 1 respectively. Inclined plates 2062 are slidably connected to the outer walls of the two limiting rods 2061 on the left and right sides. Adjusting nuts 2063 are threadedly connected to the outer walls of the limiting rods 2061. Rotating the adjusting nuts 2063 can extrude... The inclined plate 2062 moves inward along the limiting rod 2061. Due to the inclined characteristics of the surface of the inclined plate 2062, it will squeeze the trapezoidal plate 204 to move to the bottom. Under the inclination of the trapezoidal plate 204, the connecting plates 202 on both sides move apart, thereby making the reinforcing rod 5 taut. The mounting assembly 7 includes multiple positioning rods 701. The outer walls of the multiple mounting assemblies 7 are respectively set on the left and right sides of the bottom inner wall of the I-beam 4. The outer walls of the positioning rods 701 are engaged with the bottom inner wall of the I-beam 4. The top of the outer wall of the positioning rods 701 is threaded with a fixing nut 702. The positioning rods 701 and the fixing nut 702 provide a limit for the installation of the I-beam 4.

[0042] Specifically, the trapezoidal precast hollow slab 1 serves as the core load-bearing component. Through the engagement of the conical limiting block 604 and the limiting disc 602, the steel cable 603 is tightened, thereby generating lateral prestress to counteract the tensile stress under load. The limiting hole 201 provides a positioning and installation hole for the reinforcing rod 5, while the connecting plate 202 connects multiple reinforcing rods 5 to rigidly connect them to the steel beam. By rotating the adjusting nut 2063, the inclined plate 2062 can be squeezed to move inward along the limiting rod 2061. Due to the inclined characteristics of the inclined plate 2062 surface, the trapezoidal plate 204 is squeezed to move to the bottom. Under the inclination of the trapezoidal plate 204, the connecting plates 202 on both sides move apart, thereby keeping the reinforcing rod 5 in a taut state. This results in a solid bottom for the trapezoidal precast hollow slab 1, which can counteract the tensile stress. The positioning rod 701 and the fixing nut 702 provide a limit for the installation of the I-beam steel beam 4.

[0043] Reference Figure 3 , Figure 4 and Figure 5 The assembly mechanism 3 includes multiple hollow hexagonal locking blocks 301. The inner walls of the multiple hollow hexagonal locking blocks 301 are respectively set on the front side of the outer wall of the reinforcing rod 5. The inner walls of the hollow hexagonal locking blocks 301 are fixedly connected to positioning blocks 302. Multiple hollow reinforcing blocks 303 are set in the middle of the outer wall of the reinforcing rod 5. Hollow hexagonal blocks 306 with slots are set on the rear side of the outer wall of the reinforcing rod 5. A certain number of hollow reinforcing blocks 303 are selected as needed, and they are mortised and tenoned together end to end. Hollow hexagonal locking blocks 301 and hollow hexagonal blocks 306 with slots are mortised and tenoned onto both ends of the assembled hollow reinforcing blocks 303 respectively. Then, it is put on the outside of the reinforcing rod 5. The inner wall of the hollow hexagonal block 306 is fixedly connected to the limiting cylinder 304. Under the action of the positioning block 302 and the limiting cylinder 304, it is engaged with the outside of the reinforcing rod 5. The front and rear sides of the outer wall of the reinforcing rod 5 are provided with fixing components 305. The fixing components 305 include two hollow clamping cylinders 3051. The inner walls of the two hollow clamping cylinders 3051 are respectively provided on the front and rear sides of the outer wall of the reinforcing rod 5. The outer wall of the hollow clamping cylinder 3051 is threadedly connected to the compression nut 3052. By rotating the compression nut 3052, the hollow clamping cylinder 3051 is squeezed and clamped above the reinforcing rod 5. The compression nut 3052 can restrict the movement of the assembled reinforcement mechanism.

[0044] Specifically, since different trapezoidal precast hollow slabs 1 have different widths, the required number of hollow reinforcing blocks 303 are selected according to their width, and they are mortised and tenoned together end to end. Hollow hexagonal clips 301 and slotted hollow hexagonal blocks 306 are mortised and tenoned onto both ends of the assembled hollow reinforcing blocks 303, respectively. Then, they are put on the outside of the reinforcing rod 5, and under the action of the positioning block 302 and the limiting cylinder 304, they are engaged on the outside of the reinforcing rod 5. Then, hollow clamping cylinders 3051 are put on the inner walls of the hollow hexagonal clips 301 and slotted hollow hexagonal blocks 306, respectively. Then, the pressing nut 3052 is rotated to press and clamp the hollow clamping cylinder 3051 above the reinforcing rod 5. The pressing nut 3052 can restrict the movement of the assembled reinforcing mechanism, thereby further improving the strength of the reinforcing rod 5.

[0045] Reference Figure 1 , Figure 2 and Figure 6The pre-tensioning component 6 includes multiple limiting grooves 601, which are respectively opened on the left and right sides of the trapezoidal precast hollow slab 1. A limiting disc 602 is provided on the inner wall of each limiting groove 601, and the outer wall of the limiting disc 602 engages with the inner wall of the limiting groove 601. Multiple steel cables 603 are provided on the inner wall of the limiting disc 602, and conical limiting blocks 604 are provided on the left and right sides of the outer wall of each steel cable 603. The outer walls of the multiple conical limiting blocks 604 engage with the inner wall of the limiting disc 602. The limiting grooves 601 provide support for the limiting disc 602. Provided with embedded installation space, the limiting disc 602 achieves circumferential fixation through an annular groove and a limiting groove 601 with interference fit. A steel cable 603 passes through the radial channels of multiple limiting discs 602, and the tapered limiting blocks 604 at both ends are locked to the limiting discs 602 through a wedge-tightening action. The splicing reinforcement component 8 includes multiple connecting rods 801, the outer walls of which are respectively fixedly connected to the top left and right sides of the trapezoidal precast hollow slab 1. I-shaped connecting blocks 802 are fixedly connected to the outer walls of the multiple connecting rods 801 on both sides. Multiple toothed blocks 803 are fixedly connected to the left and right sides of the outer wall of 802. The connecting rod 801 acts as a force transmission link, rigidly connecting the I-shaped connecting block 802 to the trapezoidal precast hollow slab 1. When adjacent slabs are spliced, the grooves and protrusions of the I-shaped connecting block 802 form a mortise and tenon structure, and the interlocking toothed blocks 803 increase the coefficient of friction. The hoisting assembly 9 includes multiple limiting grooves 901. The outer walls of the multiple limiting grooves 901 are respectively opened at the four corners of the top of the I-shaped steel beam 4. The inner walls of the limiting grooves 901 are provided with T-shaped hole blocks 902. The outer wall of the T-shaped hole block 902 engages with the inner wall of the limiting groove 901. Limiting bolts 903 are provided on the front and rear sides of the top of the I-shaped steel beam 4. The outer wall of the limiting bolt 903 passes through the I-shaped steel beam 4 and is threadedly connected to the inner wall of the corresponding T-shaped hole block 902. The limiting groove 901 provides positioning guidance for the T-shaped hole block 902. The T-shaped hole block 902 achieves precise engagement with the groove of the limiting groove 901 through the bottom boss. The limiting bolt 903 passes through the steel beam and is threadedly connected to the T-shaped hole block 902 to form a reliable anchor.

[0046] Specifically, when the hollow slab is subjected to lateral tensile stress, the steel cable 603 transmits the tension to the limiting plate 602 through the conical limiting block 604, which is then converted into lateral prestress on the trapezoidal precast hollow slab 1, inhibiting crack propagation. During construction, prestress can be applied to the steel cable 603 through hydraulic tensioning equipment. Under the action of tension, the conical limiting block 604 automatically weds into the limiting plate 602, forming a self-anchoring system without the need for additional anchoring devices. In the splicing reinforcement component 8, after epoxy resin mortar is poured at the joint, the toothed block 803 provides mechanical interlocking force, the web of the I-shaped connecting block 802 bears shear force, and the flange resists bending moment, forming a composite force transmission path. During lifting, the hook passes through the horizontal channel of the T-shaped hole block 902, and the load is transmitted to the steel beam through bolts. The horizontal flange of the T-shaped hole block 902 increases the bearing area, avoiding local concrete bearing failure.

[0047] Working principle: First, the trapezoidal precast hollow slab 1 serves as the main load-bearing structure. Through cooperation with the conical limiting block 604 and the limiting disc 602, the steel cable 603 is tightened, thereby generating lateral prestress to counteract the tensile stress caused by the load. The limiting hole 201 provides a positioning and installation hole for the reinforcing rod 5, while the connecting plate 202 connects multiple reinforcing rods 5 to ensure a rigid connection with the steel beam. By rotating the adjusting nut 2063, the inclined plate 2062 can move inward along the limiting rod 2061. Due to the inclined characteristics of the surface of the inclined plate 2062, it will push the trapezoidal plate 204 to move to the bottom. At the same time, under the inclination of the trapezoidal plate 204, the connecting plates 202 on both sides move in opposite directions, thereby keeping the reinforcing rod 5 in a taut state. Finally, a solid structure is formed at the bottom of the trapezoidal precast hollow slab 1, effectively counteracting the tensile stress.

[0048] Furthermore, through the assembly mechanism 3, a certain number of hollow reinforcing blocks 303 are selected as needed, and these hollow reinforcing blocks 303 are connected in sequence with mortise and tenon structure. Hollow hexagonal clips 301 and slotted hollow hexagonal blocks 306 are installed at both ends of the assembled hollow reinforcing blocks 303 respectively. Then, the assembled structure is fitted around the reinforcing rod 5, and under the synergistic action of the positioning block 302 and the limiting cylinder 304, it is firmly locked onto the outside of the reinforcing rod 5. Subsequently, the hollow clamping cylinder 3051 is fitted into the inner wall of the hollow hexagonal clips 301 and the slotted hollow hexagonal blocks 306 respectively. By rotating the compression nut 3052, the hollow clamping cylinder 3051 is squeezed and clamped on the top of the reinforcing rod 5. The compression nut 3052 also restricts the movement of the reinforcing mechanism, thereby further enhancing the stability of the reinforcing rod 5.

[0049] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A composite prestressed hollow slab for bridges, comprising a trapezoidal precast hollow slab (1), characterized in that: The trapezoidal precast hollow slab (1) is fixedly connected to the front and rear sides of the bottom with I-beams (4). The bottom left and right sides of the I-beams (4) are provided with installation components (7). The top left and right sides of the I-beams (4) are provided with hoisting components (9). The adjacent sides of the two I-beams (4) are fixedly connected with multiple reinforcing rods (5). The front and rear ends of the multiple reinforcing rods (5) are provided with tensioning mechanisms (2). The front and rear sides of the trapezoidal precast hollow slab (1) are provided with pre-tensioning components (6). The pre-tensioning components (6) are used to strengthen the transverse prestress of the trapezoidal precast hollow slab (1). The left and right sides of the trapezoidal precast hollow slab (1) are provided with splicing reinforcement components (8). The outer wall of the reinforcing rods (5) is provided with an assembly mechanism (3). The tensioning mechanism (2) includes multiple limiting holes (201). The outer walls of the multiple limiting holes (201) are respectively opened on the inner wall of the I-beam (4). The front and rear ends of the multiple reinforcing rods (5) pass through the inner wall of the corresponding I-beam (4) and are fixedly connected to the connecting plate (202). A limiting strip (203) is opened on the front side of the top of the I-beam (4). A trapezoidal plate (204) is slidably connected to the inner wall of the limiting strip (203). A limiting notch (205) is opened on the left and right sides of the bottom of the trapezoidal plate (204). An extrusion assembly (206) is provided on the front and rear sides of the trapezoidal precast hollow slab (1).

2. A composite prestressed hollow slab for bridges according to claim 1, characterized in that: The assembly mechanism (3) includes multiple hollow hexagonal blocks (301). The inner walls of the multiple hollow hexagonal blocks (301) are respectively arranged on the front side of the outer wall of the reinforcing rod (5). The inner wall of the hollow hexagonal blocks (301) is fixedly connected to a positioning block (302). Multiple hollow reinforcing blocks (303) are arranged in the middle of the outer wall of the reinforcing rod (5). The rear side of the outer wall of the reinforcing rod (5) is provided with a slotted hollow hexagonal block (306). The inner wall of the slotted hollow hexagonal block (306) is fixedly connected to a limiting cylinder (304). The front and rear sides of the outer wall of the reinforcing rod (5) are provided with fixing components (305).

3. A composite prestressed hollow slab for bridges according to claim 1, characterized in that: The extrusion assembly (206) includes multiple limiting rods (2061), which are fixedly connected to the front and rear sides of the trapezoidal precast hollow slab (1). The outer walls of the two limiting rods (2061) on the left and right sides are slidably connected with inclined plates (2062), and the outer walls of the limiting rods (2061) are threadedly connected with adjusting nuts (2063).

4. A composite prestressed hollow slab for bridges according to claim 2, characterized in that: The fixing component (305) includes two hollow clamping cylinders (3051), the inner walls of the two hollow clamping cylinders (3051) are respectively disposed on the front and rear sides of the outer wall of the reinforcing rod (5), and the outer wall of the hollow clamping cylinder (3051) is threadedly connected with a compression nut (3052).

5. A composite prestressed hollow slab for bridges according to claim 1, characterized in that: The pre-tensioning component (6) includes multiple limiting grooves (601), which are respectively opened on the left and right sides of the trapezoidal precast hollow slab (1). The inner wall of the limiting groove (601) is provided with a limiting disc (602), and the outer wall of the limiting disc (602) is engaged with the inner wall of the limiting groove (601). The inner wall of the limiting disc (602) is provided with multiple steel cables (603), and the outer walls of the steel cables (603) are provided with conical limiting blocks (604) on both the left and right sides. The outer walls of the multiple conical limiting blocks (604) are engaged with the inner wall of the limiting disc (602).

6. A composite prestressed hollow slab for bridges according to claim 1, characterized in that: The mounting assembly (7) includes multiple positioning rods (701). The outer walls of the multiple mounting assemblies (7) are respectively disposed on the left and right sides of the bottom inner wall of the I-beam (4). The outer wall of the positioning rod (701) is engaged with the bottom inner wall of the I-beam (4). A fixing nut (702) is threadedly connected to the top of the outer wall of the positioning rod (701).

7. A composite prestressed hollow slab for bridges according to claim 1, characterized in that: The splicing reinforcement component (8) includes multiple connecting rods (801). The outer walls of the multiple connecting rods (801) are respectively fixedly connected to the top left and right sides of the trapezoidal precast hollow slab (1). I-shaped connecting blocks (802) are fixedly connected to the outer walls of the multiple connecting rods (801) on the left and right sides. Multiple toothed blocks (803) are fixedly connected to the outer walls of the I-shaped connecting blocks (802) on the left and right sides.

8. A composite prestressed hollow slab for bridges according to claim 1, characterized in that: The hoisting assembly (9) includes multiple limiting slots (901). The outer walls of the multiple limiting slots (901) are respectively opened at the four corners of the top of the I-shaped steel beam (4). The inner wall of the limiting slot (901) is provided with a T-shaped hole block (902). The outer wall of the T-shaped hole block (902) is engaged with the inner wall of the limiting slot (901). The front and rear sides of the top of the I-shaped steel beam (4) are provided with limiting bolts (903). The outer wall of the limiting bolt (903) passes through the I-shaped steel beam (4) and is threadedly connected to the inner wall of the corresponding T-shaped hole block (902).

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