Partial self-stress concrete prefabricated slab for road

Abstract

The invention relates to the technical field of road construction materials, in particular to a road partial self-stress concrete precast slab which comprises a main slab body, the top of the main slab body is a horizontal rectangular plane, a steel bar grid is arranged in the main slab body, and a plurality of transversely and longitudinally staggered reinforcing ribs are arranged at the bottom of the main slab body. A plurality of accommodating grooves are formed through the separation of the reinforcing ribs; and the multiple balloons are arranged and embedded in the containing grooves respectively, a liquid injection pipe is arranged at the bottom of each balloon, and a liquid injection valve is arranged at the free end of each liquid injection pipe. The rigid road surface is converted into a semi-flexible structure through the thought of'conquering with flexibility and rigidity ', durability and economical efficiency are achieved, the method is suitable for high-load traffic areas and geologically unstable road sections, and'targeted repair' is achieved through the maintenance channel, the jacking column and the independent balloon unit.

Description

Technical Field

[0001] The invention relates to the technical field of road construction materials, in particular to a partially self-stressed concrete prefabricated board for roads. Background Art

[0002] In traditional concrete pavement construction, on-site concrete pouring is usually used to form a continuous pavement structure. However, this construction method has the following drawbacks:

[0003] Road damage caused by foundation settlement: Due to uneven foundation soil or long-term load, the foundation is prone to uneven settlement, which causes stress concentration in the rigid concrete pavement, and then cracks, fractures or local collapse. Especially under the repeated rolling of large vehicles, the disease will accelerate the spread.

[0004] Moreover, this structure is difficult and costly to maintain. Traditional cast-in-place concrete pavement is an integral structure, and after local damage, a large area needs to be demolished and re-poured. Not only is the construction period long, it also seriously affects the road's traffic capacity and increases maintenance costs.

[0005] Cast-in-place concrete pavements have high requirements for foundation flatness and bearing capacity. If the foundation is not adequately treated, the road surface will easily lose its flatness due to deformation, affecting driving comfort and safety.

[0006] Therefore, there is an urgent need for a new type of concrete precast panel structure that can adapt to foundation deformation and improve crack resistance and durability, thereby extending the service life of the pavement and reducing maintenance costs. Summary of the Invention

[0007] The present invention provides a partially self-stressed concrete precast panel for road use. By adopting the idea of ​​"using softness to overcome hardness", the rigid road surface is converted into a semi-flexible structure, which has both durability and economy. It is suitable for high-load traffic areas and geologically unstable sections of road. It also uses maintenance channels, top columns and independent balloon units to achieve "targeted repair".

[0008] In order to achieve the above-mentioned purpose, the present invention provides the following technical solution: a partially self-stressed concrete precast panel for road use, comprising: a main board body, the top of the main board body is a horizontal rectangular plane, a steel grid is provided inside, and the bottom of the main board body is provided with a plurality of horizontal and vertical staggered reinforcing ribs, and each of the reinforcing ribs is separated into a plurality of receiving grooves; a balloon, the balloon is provided in plurality and is respectively embedded in each of the receiving grooves, an injection tube is provided at the bottom of each balloon, and an injection valve is provided at the free end of the injection tube.

[0009] Preferably, a semicircular groove is transversely opened at one end of the main board body, and a semicircular tenon corresponding to the semicircular groove is provided at the other end, and the height of the semicircular tenon is greater than the depth of the semicircular groove.

[0010] Preferably, each reinforcing rib is provided with a plurality of transversely penetrating channels at the top corresponding to each accommodating groove; and the injection tube of each balloon extends to the outside of both sides of the main body through the channels respectively.

[0011] Preferably, a hanging ring is provided at the bottom of each of the accommodating grooves, and a restraining net is provided at the bottom of the main board body, and the restraining net is connected to the main board body through the hanging ring.

[0012] Preferably, a maintenance channel and an upper cover threadedly matched with the maintenance channel are provided at the top of the main board body corresponding to the center of each of the accommodating slots.

[0013] Preferably, the inner edge of the bottom of each maintenance channel is provided with a rounded chamfer, the inner wall of the maintenance channel is provided with an elastic opening ring, and a top column is vertically provided in the maintenance channel, and the top column is connected to the inner circumference of the elastic opening ring through multiple tension springs; the top end of the top column extends to the inside of the upper cover and is fixed with an iron cap.

[0014] Preferably, the interior of the balloon is filled with a non-Newtonian fluid.

[0015] Preferably, the interior of the balloon is filled with antifreeze liquid.

[0016] The beneficial effects of this invention are as follows: This partially self-stressed concrete precast slab technology for road use effectively addresses the shortcomings of traditional cast-in-place concrete pavements through an innovative structural design. Precast slabs are factory-produced and assembled on-site, eliminating the need for cast-in-place concrete curing cycles and accelerating construction progress. The reinforcing bars and steel grid synergistically enhance tensile strength, extending the life of the pavement. After assembly, adjacent main slabs are hinged together by semicircular tenons fitting into semicircular grooves. This allows for slight rotation and displacement, relieves thermal and settlement stresses, and prevents cracks caused by rigid connections.

[0017] The balloons in the bottom holding tank are filled with a non-Newtonian fluid or antifreeze. When uneven ground settlement occurs, maintenance personnel redistribute the liquid within each balloon through the injection valve, thereby absorbing local stress and preventing stress concentration from being transmitted to the main body. The properties of non-Newtonian fluids allow for dynamic adaptation to vehicle loads and ground deformation. Antifreeze, on the other hand, is suitable for the cold northern climate, so the appropriate filling fluid can be selected based on geographical characteristics. Cross-sectional and longitudinal reinforcement ribs enhance overall bending rigidity, and a restraint net with hanging rings secures the balloons in place, preventing displacement and ensuring deformation coordination.

[0018] Compensation is achieved by opening the adjustment range of the upper cover balloon. After laying, sand is filled into the receiving groove to reduce the space inside the receiving groove, ensuring that the balloon meets the support requirements within the safe expansion range. In addition, the balloon can be replaced through the maintenance channel. After the balloon is inflated, the top is pressed into the maintenance channel, thereby lifting the top column and moving the iron cap to the middle of the upper cover. At this time, maintenance personnel can use equipment such as metal detectors or magnets to collect the height of the iron cap. If the iron cap is too high, it means that there is a protrusion in the foundation and the balloon is over-squeezed, requiring the release of excess liquid through the injection valve; if the iron cap is too low, it means that the foundation in this area has dropped and the balloon needs to be replenished with liquid. Therefore, this structure can quickly detect the main board after laying and carry out maintenance in time before the main board is damaged.

[0019] The flexible balloon system compensates for uneven ground settlement, reducing the need for flatness and bearing capacity, making it particularly suitable for soft soil or backfill areas. The antifreeze-filled balloons resist frost heave at low temperatures, while the non-Newtonian fluid adapts to dynamic loads, improving stability in extreme climates. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 This is a schematic diagram of the mainboard docking structure of the present invention;

[0023] Figure 3 This is a schematic diagram of the maintenance channel structure of the present invention.

[0024] In the figure: 1. Main body; 2. Steel grid; 3. Reinforcement rib; 4. Receiving groove; 5. Balloon; 6. Injection tube; 7. Injection valve; 8. Semicircular groove; 9. Semicircular tenon; 10. Restraint net; 11. Maintenance channel; 12. Upper cover; 13. Chamfer; 14. Elastic opening ring; 15. Top column; 16. Iron cap. DETAILED DESCRIPTION

[0025] The following will clearly and completely describe the technical solution of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0026] according to Figure 1 、 Figure 2 、 Figure 3 As shown, a partially self-stressed concrete precast slab for road use comprises: a main board body 1, the top of the main board body 1 is a horizontal rectangular plane, a steel grid 2 is provided inside, and a plurality of reinforcing ribs 3 staggered horizontally and vertically are provided at the bottom of the main board body 1, and each of the reinforcing ribs 3 is separated into a plurality of receiving grooves 4; a semicircular groove 8 is transversely opened at one end of the main board body 1, and a semicircular tenon 9 corresponding to the semicircular groove 8 is provided at the other end, and the height of the semicircular tenon 9 is greater than the depth of the semicircular groove 8.

[0027] The balloons 5 are provided in multiple configurations and are embedded in each of the receiving slots 4. Each balloon 5 has an injection tube 6 at its bottom, with an injection valve 7 at its free end. Each reinforcing rib 3 has multiple transverse passages extending through the top of each receiving slot 4. The injection tubes 6 of each balloon 5 extend through these passages to the exterior of the main body 1 on both sides. Each receiving slot 4 has a hanging ring at its bottom, and the main body 1 has a restraining net 10 at its bottom, connected to the main body 1 via the hanging rings.

[0028] A maintenance channel 11 is provided at the top of the main body 1, corresponding to the center of each of the receiving slots 4, and a top cover 12 that is threadedly engaged with the maintenance channel 11. The inner edge of the bottom of each maintenance channel 11 is provided with a rounded chamfer 13, and the inner wall of the maintenance channel 11 is provided with an elastic opening ring 14. A top column 15 is vertically provided within the maintenance channel 11, and the top column 15 is connected to the inner circumference of the elastic opening ring 14 via multiple tension springs; the top end of the top column 15 extends into the interior of the top cover 12 and is fixed with an iron cap 16.

[0029] This partially self-stressed concrete precast slab technology for roads effectively addresses the shortcomings of traditional cast-in-place concrete pavements through innovative structural design. Factory-produced and assembled on-site, the precast slabs avoid the curing cycle of cast-in-place concrete and accelerate construction progress. The reinforcing ribs 3 and the steel mesh 2 synergistically enhance tensile strength, extending the life of the pavement. After assembly, adjacent main slabs 1 are hinged together by semicircular tenons 9 fitting into semicircular grooves 8. This allows for slight rotation and displacement, relieves thermal and settlement stresses, and prevents cracks caused by rigid connections.

[0030] The balloons 5 in the bottom receiving tank 4 are filled with non-Newtonian fluid or antifreeze. When uneven settlement of the foundation occurs, maintenance personnel redistribute the liquid in each balloon 5 through the injection valve 7, thereby absorbing local stress and preventing stress concentration from being transmitted to the main body 1. The properties of non-Newtonian fluids can dynamically adapt to vehicle loads and foundation deformation. Antifreeze can adapt to the cold climate in northern China, so the appropriate filling liquid can be selected based on geographical characteristics. The horizontal and vertical staggered reinforcement ribs 3 enhance the overall bending stiffness, and the restraint net 10 fixes the position of the balloons 5 with hanging rings to prevent displacement and ensure deformation coordination.

[0031] By opening the upper cover 12, the adjustment range of the balloon 5 is compensated. After laying, sand is filled into the receiving groove 4 to reduce the space inside the receiving groove 4, ensuring that the balloon 5 meets the support requirements within the safe expansion range. In addition, the balloon 5 can be replaced through the maintenance channel 11. After the balloon 5 expands, the top is squeezed into the maintenance channel 11, thereby lifting the top column 15 and moving the iron cap 16 to the middle of the upper cover 12. At this time, the maintenance personnel can use equipment such as metal detectors or magnets to collect the height of the iron cap 16. When the iron cap 16 is too high, it means that there is a protrusion in the foundation, the balloon 5 is over-squeezed, and the excess liquid needs to be released through the injection valve 7; when the iron cap 16 is too low, it means that the foundation in this area has dropped, and the balloon 5 needs to be replenished with liquid. Therefore, this structure can quickly detect the main board body 1 after laying, and perform maintenance in time before the main board body 1 is damaged.

[0032] The flexible spherical balloon system compensates for uneven ground settlement, reducing the stringent requirements for foundation flatness and bearing capacity, making it particularly suitable for areas with soft soil or backfill. The antifreeze-filled balloon resists frost heave at low temperatures, while the non-Newtonian fluid adapts to dynamic loads, improving stability in extreme climates.

[0033] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A partially self-stressed concrete prefabricated slab for road use, characterized in that: include: A main board (1), wherein the top of the main board (1) is a horizontal rectangular plane, a steel grid (2) is provided inside, and a plurality of reinforcing ribs (3) staggered in a horizontal and vertical direction are provided at the bottom of the main board (1), and the plurality of receiving slots (4) are separated by the respective reinforcing ribs (3); The balloons (5) are provided in plurality and are respectively embedded in the respective receiving grooves (4). A liquid injection tube (6) is provided at the bottom of each balloon (5), and a liquid injection valve (7) is provided at the free end of the liquid injection tube (6).

2. The partially self-stressed concrete precast slab for road use according to claim 1, characterized in that: A semicircular groove (8) is transversely provided at one end of the main body (1), and a semicircular tenon (9) corresponding to the semicircular groove (8) is provided at the other end, wherein the height of the semicircular tenon (9) is greater than the depth of the semicircular groove (8).

3. The partially self-stressed concrete precast slab for road use according to claim 1, characterized in that: Each reinforcing rib (3) is provided with a plurality of transversely penetrating channels at the top of each corresponding receiving groove (4); the injection tube (6) of each balloon (5) extends to the outside of both sides of the main body (1) through the channels respectively.

4. The partially self-stressed concrete precast slab for road use according to claim 1, characterized in that: A hanging ring is provided at the bottom of each accommodating groove (4), and a restraining net (10) is provided at the bottom of the main board body (1). The restraining net (10) is connected to the main board body (1) via the hanging ring.

5. The partially self-stressed concrete precast slab for road use according to claim 1, characterized in that: A maintenance channel (11) is provided at the top of the mainboard body (1) in the center of each of the receiving slots (4), and an upper cover (12) threadedly engaged with the maintenance channel (11).

6. The partially self-stressed concrete precast slab for road use according to claim 5, characterized in that: The inner edge of the bottom of each maintenance channel (11) is provided with a round chamfer (13), the inner wall of the maintenance channel (11) is provided with an elastic opening ring (14), and a top column (15) is vertically provided in the maintenance channel (11), and the top column (15) is connected to the inner periphery of the elastic opening ring (14) through a plurality of tension springs; the top end of the top column (15) extends to the inside of the upper cover (12) and is fixed with an iron cap (16).

7. The partially self-stressed concrete precast slab for road use according to claim 1, characterized in that: The interior of the balloon (5) is filled with a non-Newtonian fluid.

8. The partially self-stressed concrete precast slab for road use according to claim 1, characterized in that: The interior of the balloon (5) is filled with antifreeze liquid.

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