A modular precast composite fiberboard for rapid roadbed repair

Abstract

This utility model relates to the field of road construction technology, specifically to a modular precast composite fiberboard for rapid roadbed repair. It includes a base module and fasteners. The base module is a hexagonal prism with a plate body. A filling cavity is located at the bottom of the plate body, and perforations are arranged circumferentially at the top. The filling cavity is filled with an absorbent board, and the perforations connect to the filling cavity. A connecting structure is provided on the peripheral sidewall of the plate body, allowing the base module to be connected to adjacent circumferential base modules. A fixing hole is located at the center of the plate body. Fasteners pass through the fixing hole and connect to the substrate below the base module. This structural design enables rapid splicing and repair of damaged roadbeds.

Description

Technical Field

[0001] This utility model relates to the field of road construction technology, and more specifically, to a modular prefabricated composite fiberboard for rapid roadbed repair. Background Technology

[0002] The occurrence of roadbed water damage in mountainous and hilly areas is closely related to regional climate and geological conditions. Southern my country experiences heavy rainfall annually, with a high concentration of precipitation, exceeding 50% of the annual rainfall occurring between July and September. This seasonal concentration of rainfall leads to a sharp increase in surface runoff and rapid rises and falls in river levels, creating a strong hydraulic impact on the roadbed. Geologically, mountainous and hilly areas commonly feature collapsible loess and gravelly soil slopes. While these geological materials possess a certain structural strength when dry, they rapidly soften and disintegrate upon contact with water, leading to roadbed slope instability. Infiltration softening-induced collapse is a typical failure mode in semi-fill / semi-cut road sections. When rainfall infiltration saturates the soil in the fill area, the soil's self-weight increases while its shear strength decreases, resulting in sliding and collapse under the combined effects of gravity and hydraulic forces. The riverside section faces a more severe complex erosion mechanism: the slope toe is eroded by the river flow, forming local suspended areas; the upper soil loses support, producing tensile cracks; rainwater seeps down along the cracks, further softening the soil, and eventually leading to roadbed settlement.

[0003] Currently, roadbed settlement can be addressed by excavating weak soil layers and backfilling with highly permeable, low-compressibility materials such as gravel / stone, or by using dynamic compaction to impact the foundation and increase soil density. Afterward, cement concrete must be poured to form a stable base surface. However, existing methods have significant limitations: firstly, construction must avoid periods of rainfall; secondly, the curing period required for cement hydration and setting is relatively long, severely restricting project efficiency. Utility Model Content

[0004] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a modular precast composite fiberboard for rapid roadbed repair, designed to improve construction efficiency and quickly repair damaged areas.

[0005] A modular precast composite fiberboard for rapid roadbed repair according to an embodiment of the present invention includes:

[0006] A substrate module, which is a hexagonal prism, has a plate body. A filling cavity is located at the bottom of the plate body, and perforations are arranged circumferentially at the top of the plate body. An absorbent plate is filled within the filling cavity, and the perforations connect to the filling cavity. A connecting structure is provided on the peripheral sidewall of the plate body, allowing the substrate module to be connected to adjacent circumferentially positioned substrate modules via the connecting structure. A fixing hole is located at the center of the plate body.

[0007] Fasteners that pass through the fixing holes and connect to the base below the substrate module.

[0008] According to some embodiments of the present invention, the plate body is provided with a plurality of honeycomb-shaped holes.

[0009] According to some embodiments of the present invention, the plate is made of composite fibers.

[0010] According to some embodiments of the present invention, the water-absorbing plate is made of a porous water-absorbing material.

[0011] According to some embodiments of the present invention, the connecting structure includes a protrusion and a structural groove, wherein the protrusion and the structural groove are alternately arranged on the side of the plate.

[0012] According to some embodiments of the present invention, the cross-section of the protrusion is an isosceles trapezoid.

[0013] According to some embodiments of this utility model, the fastener is an anchor rod or an expansion bolt.

[0014] According to some embodiments of the present invention, a drainage bevel is provided at the outer edge of the bottom of the plate, and the drainage bevels of adjacent plates can be combined to form a drainage network.

[0015] According to some embodiments of the present invention, the drainage network is provided with an overflow trough, one end of the overflow trough is connected to the drainage slope, and the other end of the overflow trough is connected to the filling cavity.

[0016] According to some embodiments of this utility model, the thickness of the plate is 3cm to 10cm.

[0017] A modular precast composite fiberboard for rapid roadbed repair according to an embodiment of the present invention has at least the following beneficial effects:

[0018] According to the present invention, the modular prefabricated composite fiberboard for rapid roadbed repair includes a base module and fasteners. The base module is a hexagonal prism with a plate body. A filling cavity is located at the bottom of the plate body, and perforations are arranged circumferentially at the top. The filling cavity is filled with an absorbent board, and the perforations connect to the filling cavity. A connecting structure is provided on the peripheral sidewall of the plate body, allowing the base module to connect with adjacent circumferential base modules via the connecting structure. A fixing hole is located at the center of the plate body. Fasteners pass through the fixing hole and connect to the base body below the base module. Through this structural design, the prefabricated base module and matching fasteners can be pre-manufactured in a factory and transported to the flood damage site. During construction, only the damaged roadbed surface needs to be cleaned, and the base module is quickly assembled using the connecting structure to form a repair layer. The fasteners are then anchored through the fixing hole. This process eliminates the need for traditional cement pouring and a long curing period, significantly shortening the construction window during rainfall intervals and greatly improving repair efficiency, especially suitable for emergency repairs in areas with concentrated rainfall. Meanwhile, the water-absorbing board's continuous absorption and management of seepage water effectively weakens the softening effect of moisture on the subgrade soil, delaying the development of subgrade settlement and deformation. The modular design not only facilitates flexible adjustment of the repair area based on the actual water damage area, but its interlocking hexagonal prism shape further enhances the integrity and deformation resistance of the repair structure. The composite fiber substrate module itself possesses high strength and weather resistance, providing durable surface protection for the subgrade, resisting the combined erosion of surface runoff and river scouring, and comprehensively improving the water damage resistance of subgrades in mountainous and hilly areas under complex climatic and geological conditions. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of an assembly structure of the present invention;

[0020] Figure 2 This is a schematic diagram of the bottom structure of this utility model;

[0021] Figure 3 This is a schematic diagram of an exploded structure of the present invention;

[0022] Figure 4 This is a schematic diagram of a substrate module of this utility model;

[0023] Figure 5 This is a structural schematic diagram of the substrate module of this utility model from the bottom view.

[0024] In the diagram: 100-substrate module, 101-board body, 110-filling cavity, 120-cutout hole, 130-connection structure, 131-protrusion, 132-structural groove, 140-fixing hole, 150-honeycomb hole, 160-drainage angle, 170-overflow groove; 200-water absorption plate; 300-fastener. Detailed Implementation

[0025] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0026] In the description of this utility model, it should be understood that the orientation descriptions, such as up, down, etc., are based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0027] In the description of this utility model, "multiple" refers to two or more. The use of "first" and "second" is for distinguishing technical features only and should not be construed as indicating or implying relative importance, or implicitly indicating the number of technical features or their sequential relationship.

[0028] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0029] Reference Figures 1 to 5 As shown, this utility model discloses a modular prefabricated composite fiberboard for rapid roadbed repair, including a base module 100 and fasteners 300. The base module 100 is a hexagonal prism, and a plate body 101 is provided on the base module 100. A filling cavity 110 is provided at the lower part of the plate body 101, and a perforated hole 120 is provided circumferentially on the upper part of the plate body 101. The filling cavity 110 is filled with a water-absorbing plate 200, and the perforated hole 120 connects to the filling cavity 110. A connecting structure 130 is provided on the peripheral sidewall of the plate body 101, and the base module 100 can be connected to the circumferentially adjacent base module 100 through the connecting structure 130. A fixing hole 140 is provided at the center of the plate body 101. The fasteners 300 pass through the fixing hole 140 and are connected to the base body below the base module 100.

[0030] Specifically, in this embodiment, the hexagonal prism shape of the substrate module 100 has multi-directional connection capabilities. Through the connection structure 130 provided on the peripheral sidewall of the plate 101, it achieves stable splicing with adjacent circumferential substrate modules 100, forming a continuous bearing surface covering the damaged area of ​​the roadbed. A water-absorbing plate 200 is embedded in the filling cavity 110 at the lower part of the plate 101. When rainfall or surface water seeps into the roadbed, the water is introduced into the filling cavity 110 through the circumferentially distributed perforations 120 on the upper part of the plate 101. The water-absorbing plate 200 actively absorbs and temporarily stores the water, effectively intercepting and managing the seepage water, significantly reducing the continuous infiltration of water into the deeper soil layers of the roadbed. This process directly alleviates the softening effect of water on the roadbed soil, especially collapsible loess or gravelly soil, and inhibits the sudden drop in shear strength and increase in self-weight caused by soil saturation, thereby reducing the risk of slippage and collapse. The fixing hole 140 located at the center of the plate 101 is used in conjunction with the fastener 300 to enable the base plate module 100 to penetrate the repair layer and establish a reliable anchorage with the underlying roadbed substrate, ensuring the overall stability of the repair structure and resisting displacement caused by water impact or soil deformation.

[0031] In some embodiments of this utility model, a plurality of honeycomb-shaped holes 150 are provided on the plate 101. Specifically, in this embodiment, by providing honeycomb-shaped holes 150, the weight of the substrate module 100 is reduced while the bending stiffness of the plate 101 is improved, achieving a lightweight design. When the repair layer is subjected to vehicle loads or uneven soil settlement stress, the honeycomb-shaped holes 150 reduce the risk of local deformation through stress dispersion mechanism, maintaining the structural integrity of the plate 101. In addition, the contact interface between the honeycomb-shaped holes 150 and the water-absorbing plate 200 in the filling cavity 110 is expanded, promoting capillary diffusion and even distribution of moisture in the water-absorbing material, avoiding performance degradation caused by local saturation.

[0032] In some embodiments of this utility model, the plate 101 is made of composite fibers. Specifically, in this embodiment, the plate 101 can use E-glass fiber or corrosion-resistant C-glass fiber as the reinforcing phase, and epoxy resin or vinyl ester resin as the matrix phase. This combination has high flexural strength and impact toughness, effectively bearing vehicle loads and soil deformation stress, while the resin matrix provides chemical stability, resisting the erosion of moisture and salt in the roadbed environment. Basalt fiber reinforced thermoplastic composite material is an alternative, using molten basalt fiber as the reinforcing body and polypropylene or nylon as the matrix. Its natural mineral components endow it with excellent weather resistance and resistance to ultraviolet aging, making it suitable for long-term outdoor service environments. Carbon fiber reinforced thermosetting composite material is suitable for high-strength requirements. Carbon fiber provides ultra-high modulus, and combined with a phenolic resin matrix, it achieves deformation control under extreme loads, but the cost is high. All types of composite fibers need to be prefabricated into hexagonal prism substrate modules 100 through hot pressing molding process to ensure the geometric accuracy of the plate 101 and the structural integrity of the honeycomb pores 150.

[0033] In some embodiments of this utility model, the absorbent plate 200 is made of a porous absorbent material. Specifically, in this embodiment, the porous absorbent material used in the absorbent plate 200 can be one or more of the following: superabsorbent resin, diatomaceous earth-based composite material, and activated carbon fiber felt. The superabsorbent resin is mainly composed of cross-linked sodium polyacrylate or starch graft copolymer, and its three-dimensional network structure can absorb hundreds of times its own weight in water and convert it into a gel state, achieving rapid interception. The diatomaceous earth-based composite material is formed by hot pressing natural diatomaceous earth and cellulose fibers, relying on the high specific surface area and capillary effect of diatom micropores to achieve water adsorption and slow release. The activated carbon fiber felt uses viscose-based carbon fiber as a carrier, which has both high water absorption rate and pollutant adsorption function, and is suitable for seepage water containing silt. All three types of materials need to be surface modified with a hydrophobic agent to ensure that the morphological stability of the porous structure is maintained after water absorption saturation, and to avoid the blockage of the water flow path of the honeycomb pores 150 and the circumferential hollow holes 120 due to expansion and deformation.

[0034] In some embodiments of this utility model, the connecting structure 130 includes protrusions 131 and structural grooves 132, which are alternately arranged on the sides of the plate 101. Specifically, in this embodiment, the protrusions 131 and structural grooves 132 are distributed in a complementary manner on adjacent sides of the hexagonal prism plate 101. During construction, after fixing the central base plate module 100, the protrusions 131 / structural grooves 132 of a single base plate module 100 are sequentially embedded axially into the corresponding structural grooves 132 / protrusions 131 of the central base plate module 100, forming a mechanical interlock. This allows for free fine-tuning to adapt to the unevenness of the roadbed surface and resists horizontal shear displacement. When the repair layer is subjected to vehicle loads or soil deformation stress, the interlocking structure transmits the load through contact surface pressure, causing the stress to spread evenly along the assembly network, avoiding module instability caused by local stress concentration. The standardized prefabrication of the protrusions 131 and structural grooves 132 eliminates the need for specialized tools or complex positioning during module assembly. Construction workers can complete the fitting operation simply by visual alignment, significantly shortening the repair time window during periods of rainfall respite. The interlocking structure allows for the distributed transfer of loads through the interlocking surfaces when a single point of force is applied, exhibiting significantly better shear resistance than traditional planar splicing, making it particularly suitable for the uneven settlement characteristics of roadbeds in mountainous and hilly areas. The reserved gaps between modules serve as space for thermal expansion, preventing the composite fiberboard 101 from deforming due to temperature changes and extending the service life of the repair layer.

[0035] In some embodiments of this utility model, the cross-section of the protrusion 131 is an isosceles trapezoid. Specifically, in this embodiment, the isosceles trapezoidal protrusion 131 not only has high structural strength at the root, but also has two guiding inclined surfaces, making it easy to insert into the structural groove 132.

[0036] In some embodiments of this utility model, the fastener 300 is an anchor rod or an expansion bolt. Specifically, in this embodiment, when constructing on a soft foundation, anchor rods can be used for deep insertion; when constructing on a hard foundation, bolt holes can be drilled and expansion bolts can be driven in to fix the base plate module 100.

[0037] In some embodiments of this utility model, a drainage bevel 160 is provided at the outer edge of the bottom of the plate 101, and the drainage bevels 160 of adjacent plates 101 can be combined to form a drainage network. Specifically, in this embodiment, the drainage bevel 160 cuts the bottom edge of the hexagonal prism plate 101 at a specific angle. When adjacent base module 100 are assembled, their drainage bevels 160 automatically combine to form a continuous V-shaped or trapezoidal trench network, covering the contact interface between the lower surface of the repair layer and the subgrade soil. This drainage network, as a secondary water guiding channel, together with the honeycomb holes 150, circumferential hollow holes 120, and gaps between modules on the upper part of the plate 101, constitutes a multi-level seepage path. When surface runoff caused by heavy rainfall exceeds the instantaneous drainage capacity of the honeycomb-shaped pores (150°), the excess water flows downhill along the modular assembly surface. Simultaneously, seepage water within the subgrade migrates laterally to the edge of the repair layer due to soil obstruction. Both types of water flow are introduced into the drainage network of 160° angled trenches. The trenches, with their sloping structure, generate a directional flow effect, efficiently transporting water to pre-designated collection points or regional drainage systems, significantly reducing the risk of waterlogging and softening of the subgrade soil. The continuous trench network with 160° angled drainage significantly accelerates water collection efficiency at the repair zone boundary, particularly suitable for the high-velocity runoff environment of steep slopes in mountainous and hilly areas, directly reducing the erosion intensity at the toe of river sections caused by river scouring. Its active drainage function reduces the water load of the porous absorbent board (200°), extends the effective working time of the absorbent material during continuous rainfall, and avoids secondary infiltration of water due to saturation. The sloping structure reduces the probability of silt accumulation at the bottom of slab 101, maintaining the long-term unobstructed flow of water channels. During construction, the prefabricated drainage slope 160° requires no secondary processing on-site, and the drainage network is automatically formed during module assembly, further simplifying the emergency repair process.

[0038] In some embodiments of this utility model, the drainage network is provided with an overflow channel 170, one end of which is connected to a drainage slope 160, and the other end of which is connected to a filling cavity 110. Specifically, in this embodiment, when concentrated heavy rainfall causes surface runoff overload, although the drainage slope 160 network can efficiently guide the flow, temporary water level spikes may still occur under extreme flow conditions. At this time, the overflow channel 170 immediately activates a diversion mechanism, guiding the excess water in the ditch into the filling cavity 110 through the inclined pipe wall. The porous absorbent plate 200 quickly absorbs the injected water, using its highly absorbent resin or diatomaceous earth-based material to temporarily store the overloaded water, preventing water accumulation below the repair layer from soaking and softening the subgrade soil. This process forms a graded regulation and storage system: the drainage slope 160 network is responsible for the directional diversion of normal runoff, while the overflow channel 170 is dedicated to the emergency transfer of peak flow. Together, they ensure that there is no continuous water accumulation in the repair area under different rainfall intensities.

[0039] In some embodiments of this utility model, the thickness of the plate 101 is 3cm to 10cm. Specifically, in this embodiment, the thickness of the plate 101 can be customized according to the specific load-bearing type.

[0040] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A modular precast composite fiberboard for rapid roadbed repair, characterized in that, include: A substrate module (100) is a hexagonal prism. The substrate module (100) is provided with a plate (101). A filling cavity (110) is provided at the lower part of the plate (101). A perforated hole (120) is provided on the upper part of the plate (101). A water-absorbing plate (200) is filled in the filling cavity (110). The perforated hole (120) communicates with the filling cavity (110). A connecting structure (130) is provided on the peripheral sidewall of the plate (101). The substrate module (100) can be connected to the peripherally adjacent substrate modules (100) through the connecting structure (130). A fixing hole (140) is provided at the center of the plate (101). Fastener (300) passes through the fixing hole (140) and is connected to the base below the substrate module (100).

2. The modular precast composite fiberboard for rapid roadbed repair according to claim 1, characterized in that, The plate (101) is provided with a number of honeycomb-shaped holes (150).

3. The modular precast composite fiberboard for rapid roadbed repair according to claim 2, characterized in that, The plate (101) is made of composite fiber.

4. The modular precast composite fiberboard for rapid roadbed repair according to claim 3, characterized in that, The absorbent plate (200) is made of porous absorbent material.

5. The modular precast composite fiberboard for rapid roadbed repair according to claim 1, characterized in that, The connecting structure (130) includes a protrusion (131) and a structural groove (132), the protrusion (131) and the structural groove (132) being alternately arranged on the side of the plate (101).

6. The modular precast composite fiberboard for rapid roadbed repair according to claim 5, characterized in that, The cross-section of the protrusion (131) is an isosceles trapezoid.

7. The modular precast composite fiberboard for rapid roadbed repair according to claim 1, characterized in that, The fastener (300) is an anchor rod or an expansion bolt.

8. The modular precast composite fiberboard for rapid roadbed repair according to claim 1, characterized in that, The bottom outer edge of the plate (101) is provided with a drainage oblique angle (160), and the drainage oblique angles (160) of adjacent plates (101) can be combined to form a drainage network.

9. The modular precast composite fiberboard for rapid roadbed repair according to claim 8, characterized in that, The drainage network is provided with an overflow channel (170), one end of which is connected to the drainage slope (160), and the other end of which is connected to the filling cavity (110).

10. The modular precast composite fiberboard for rapid roadbed repair according to claim 1, characterized in that, The thickness of the plate (101) is 3cm to 10cm.

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