FRP tendon stretching type self-resetting inspection walkway system

Abstract

The utility model discloses a kind of FRP tendon tensioning type self-resetting inspection walkway systems, belong to civil engineering facilities technical field.The system includes foundation cushion, low-friction cushion layer laid thereon, and multiple prefabricated concrete walkway plates, walkway plate interior is embedded with through length channel, FRP tendon passes through it, and its both ends are prestressed and anchored by tensioning anchoring assembly arranged at path end portion, to pre-press walkway plate into a continuous flexible whole.When uneven settlement occurs in ground base, low-friction cushion layer allows walkway plate to slide smoothly, and FRP tendon is stored elastic potential energy under tension;After ground base is stable, the elastic restoring force of FRP tendon drives walkway plate to reset, and road surface is automatically recovered flat.The utility model utilizes the linear elasticity and corrosion resistance characteristics of FRP tendon, realizes the self-resetting function and long-term maintenance-free of walkway system, especially suitable for substation, soft soil foundation and other easily settlement and corrosive environment.

Description

Technical Field

[0001] This utility model belongs to the field of civil engineering facilities technology, specifically relating to an FRP (fiberglass reinforced plastic) tensioned self-resetting inspection walkway system. Background Technology

[0002] In the operation of substations, large factories, and other similar locations, regular equipment inspections are a crucial aspect of ensuring safety. As the pathways for inspection personnel, maintaining the flatness, stability, and safety of inspection walkways is a fundamental prerequisite for improving inspection efficiency and ensuring personnel safety.

[0003] Currently, most common patrol walkway systems only consist of single cast-in-place concrete walkway slabs or ordinary precast concrete slabs. Cast-in-place concrete walkways, which primarily serve a functional purpose, are typically formed on-site by tying reinforcing steel, erecting formwork, and pouring concrete. Their primary drawback is the long construction period; quality is greatly affected by on-site construction conditions, personnel skills, and maintenance levels, making it difficult to guarantee uniformity. More importantly, as a continuous rigid structure tightly integrated with the foundation, it is highly susceptible to unavoidable uneven settlement in the underlying soft soil foundation or backfill area, resulting in significant tensile stress within the structure. This can lead to overall cracking and breakage of the walkway, causing permanent damage. Repair requires large-scale crushing, removal, and recasting, which is not only costly but also occupies the inspection passage for extended periods, severely disrupting normal production. Ordinary precast concrete walkways, on the other hand, use factory-prefabricated concrete slabs laid on-site, improving construction efficiency to some extent. However, this system only utilizes the rigid interlocking or simple overlapping between the slabs of ordinary precast concrete walkways, lacking the ability to coordinate deformation as a whole. When the foundation settles, each slab responds independently, which can easily create height differences or local depressions at the joints. Without the cooperation of other components, it can easily trip up inspection personnel, and in severe cases, cause the edges of the slabs to crack due to stress concentration.

[0004] Therefore, existing patrol trail systems suffer from fundamental design flaws when facing this challenge. These flaws stem from a focus solely on modifying the trail slabs themselves, such as material substitution or structural reinforcement to improve flatness and stability. However, these component-level optimizations fail to address the core issue causing trail system failure in real-world engineering environments: the inability to adapt to dynamic foundation deformation as a whole. They simply treat the trail system as a mechanical assembly of independent slabs. Regardless of whether rigid connections or complex wind-resistant anchoring are used, the design thinking remains static and discrete. Specifically, existing technologies optimize the material formulation of the trail slabs to improve their strength and corrosion resistance, improve structural design to enhance crack resistance, or add auxiliary structures such as clips and drainage channels. However, these improvements consistently fail to break through the "individual component" design paradigm. As a result, the completed trail is essentially a simple arrangement of isolated slabs, lacking an effective collaborative working mechanism within the system. When the foundation inevitably experiences uneven settlement, this inherent defect becomes more apparent. Due to the lack of a core tensioning component that connects the discrete prefabricated walkway slabs into a flexible whole, the system cannot coordinate deformation, leading to stress concentration and slab misalignment. More importantly, because it lacks an internal mechanism to provide elastic recovery, once deformation occurs, the system is unable to automatically restore flatness, and the damage is permanent. Summary of the Invention

[0005] To address the problems of existing patrol trail systems being monolithic, unable to adapt to uneven foundation settlement, prone to permanent damage, and having high maintenance costs, this utility model provides an FRP-reinforced tensioned self-resetting patrol trail system. By connecting discrete precast slabs into a flexible whole through pre-tensioned FRP reinforcements and combining it with low-friction padding technology, a long-lasting trail system with the ability to actively adapt to foundation deformation, automatically restore road surface smoothness, and with a high degree of assembly and low cycle cost is constructed.

[0006] To achieve this objective, the following solution is provided: This utility model provides an FRP (fiberglass reinforced plastic) tensioned self-resetting inspection walkway system, comprising multiple precast concrete walkway slabs, a low-friction pad layer, and a foundation pad layer; each concrete walkway slab has at least one transverse channel inside, through which FRP (fiberglass reinforced plastic) bars are inserted, extending from the end of the concrete walkway slab; an anchoring steel end plate is pre-embedded at the end of the concrete walkway slab, and the anchoring steel end plate has holes for the FRP bars to pass through; a tensioning anchoring assembly is also provided at the end of the concrete walkway slab, and the tensioning anchoring assembly acts on the anchoring steel end plate. Furthermore, the inner wall of the elongated channel inside the concrete walkway slab is provided with a smooth corrugated sleeve.

[0007] Furthermore, the tensioning anchorage assembly includes a tensioning end anchor and a fixed end anchor; the fixed end anchor and the tensioning end anchor are respectively anchored at both ends of the FRP bar.

[0008] Furthermore, the low-friction pad layer is an engineering plastic sheet, a gravel layer, or a fine sand layer.

[0009] Furthermore, the engineering plastic sheet is a high-density polyethylene sheet or a polytetrafluoroethylene sheet.

[0010] Furthermore, the FRP reinforcement bars are arranged in single or multiple parallel sections.

[0011] Furthermore, the FRP reinforcement is made of glass fiber, carbon fiber, or basalt fiber reinforced composite material.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows: 1. This utility model endows the walkway system with excellent self-resetting ability through pre-tensioned FRP bars and tensioning anchor components. When the walkway slab deforms due to foundation settlement, the FRP bars are stretched and store elastic potential energy. After the foundation stabilizes, this potential energy is released, driving the walkway slab to automatically rebound, effectively restoring the road surface smoothness, and realizing a fundamental transformation from "passive damage" to "active adaptation and recovery".

[0013] 2. By laying a low-friction pad between the foundation pad and the walkway slab, the walkway system is given a smooth overall coordinated deformation capability. This pad effectively reduces the frictional resistance between the walkway slab and the foundation, ensuring that when the foundation settlement occurs, the tensile force of the FRP reinforcement can overcome the frictional force, so that the whole system can bend as a whole like a flexible chain, avoiding stress concentration and structural damage caused by local jamming. 3. The FRP reinforcement used in this invention is corrosion resistant and does not require the complex anti-corrosion treatment required for prestressed steel strands, which greatly reduces the need for later maintenance and cycle costs. At the same time, it gives the system excellent electromagnetic compatibility. FRP reinforcement is a non-magnetic and non-conductive material, which will not generate eddy current heating or interfere with electrical equipment when used in strong electromagnetic field environments such as substations, thus ensuring high safety.

[0014] 4. This utility model ensures the reliability of FRP reinforcement sliding freely within the channel and long-term use by pre-embedded through-holes inside the walkway slab and optional smooth corrugated sleeves, minimizing friction and wear during tensioning and resetting processes, and guaranteeing the long-term effectiveness of the self-resetting function.

[0015] 5. This utility model, through the systematic integration and synergistic effect of the aforementioned distinguishing technical features, successfully solves the industry pain point of existing inspection walkways being easily damaged and difficult to maintain due to their inability to adapt to uneven foundation settlement. It achieves a response from deformation to reset, significantly reducing maintenance frequency and reconstruction costs through self-resetting functionality, and lowering replacement costs through highly durable components, resulting in a significant reduction in cycle costs. Simultaneously, the system's collaborative design maintains long-term road surface smoothness, ensuring the safety of inspection personnel, and also possesses electromagnetic safety, making it particularly suitable for sensitive industrial environments. Importantly, all components can be prefabricated in the factory; on-site construction only requires assembly, reinforcement, and tensioning, resulting in fast construction speed, easily guaranteed quality, and alignment with the development direction of industrialized construction. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the longitudinal section structure of a single concrete walkway slab unit in the FRP reinforcement tensioned self-resetting inspection walkway system of this utility model. Figure 2 This is a schematic diagram of the overall plan layout of a single concrete walkway slab unit in the FRP tensioned self-resetting inspection walkway system of this utility model. Figure 3 This is a partially enlarged cross-sectional view of the connection nodes between concrete walkway slabs and the FRP reinforcement passing through the FRP reinforcement in the FRP reinforcement tensioned self-resetting inspection walkway system of this utility model.

[0017] The markings in the attached diagram are as follows: 1. Concrete walkway slab; 2. Low-friction pad layer; 3. Foundation pad layer; 4. FRP reinforcement; 5. Anchor steel end plate; 6. Corrugated sleeve; 7. Tensioning end anchor; 8. Fixed end anchor; 9. Foundation. Detailed Implementation

[0018] The technical solutions of the utility model embodiments will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the utility model, and not all embodiments. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the utility model.

[0019] Reference Figure 1-3 The present invention provides an FRP tensioned self-resetting inspection walkway system, which includes multiple precast concrete walkway slabs 1 laid along the inspection path, a low friction pad layer 2 and a foundation pad layer 3. The concrete walkway slabs 1 are located at the top of the road surface, the foundation pad layer 3 is laid on the foundation 9, and the low friction pad layer 2 is located between the concrete walkway slabs 1 and the foundation pad layer 3. Each concrete walkway slab 1 has at least one transverse channel inside, through which FRP reinforcement bars 4 are inserted. The FRP reinforcement bars 4 provide continuous elastic restoring force to the system, driving the walkway slab to automatically reset after the foundation settlement stabilizes, and achieving maintenance-free operation due to their corrosion resistance. The FRP reinforcement bars 4 extend from the end of the concrete walkway slab 1 and connect to the tension anchoring assembly set at the end of the concrete walkway slab 1. An anchoring steel end plate 5 is pre-embedded at the end of the concrete walkway slab 1. The anchoring steel end plate 5 has holes for the FRP reinforcement bars 4 to pass through. The anchoring steel end plate 5 evenly distributes the huge concentrated force of the tension anchoring assembly to the entire concrete cross section of the concrete walkway slab 1, effectively preventing local pressure and providing a safe and reliable force transmission foundation for the system. The tension anchoring assembly acts on the anchoring steel end plate 5, applying prestress to the FRP reinforcement bars 4 and anchoring them, so that the concrete walkway slab 1 forms a flexible whole under the pre-compression of the FRP reinforcement bars 4.

[0020] As a preferred embodiment, the inner wall of the continuous channel inside the concrete walkway slab 1 is provided with a smooth corrugated sleeve 6 to reduce the frictional resistance and wear of the FRP reinforcement when sliding in the channel, thus ensuring the long-term effectiveness of the self-resetting function.

[0021] As a preferred embodiment, the tensioning anchorage assembly includes a tensioning end anchor 7 and a fixed end anchor 8; the fixed end anchor 8 is pre-installed and anchored at one end of the FRP bar 4, and the tensioning end anchor 7 is located at the other end of the FRP bar 4. The fixed end anchor 8 provides a reliable stress support point for the FRP bar 4 and works in conjunction with the tensioning end anchor 7 to ensure the establishment and stability of the initial prestressed system of the system.

[0022] As a preferred embodiment, the low-friction pad 2 is an engineering plastic sheet, a gravel layer, or a fine sand layer; the engineering plastic sheet is a high-density polyethylene sheet or a polytetrafluoroethylene sheet; when using a high-density polyethylene sheet, its preferred thickness is 5~10 mm, which can provide sufficient durability and is not easily crushed while ensuring low friction performance; when using a fine sand layer, its preferred laying thickness is 20~30 mm, which can form an effective sliding layer; the friction coefficient of the low-friction pad 2 is lower than the friction coefficient of the concrete walkway slab 1 in direct contact with the foundation pad 3, ensuring that the system can slide smoothly as a whole when the foundation deforms, providing the necessary conditions for the FRP reinforcement 4 to elastically drive the walkway slab to reset.

[0023] As a preferred implementation, the FRP reinforcement 4 is arranged in single or multiple parallel columns; when multiple FRP reinforcements are used, multiple independent through-holes are pre-embedded in the walkway slab, with each reinforcement passing through one hole; this design gives the system adjustable load-bearing capacity and structural stiffness, enabling the walkway system to flexibly adapt to application scenarios with different spans and load levels.

[0024] As a preferred implementation, the FRP reinforcement 4 uses glass fiber, carbon fiber or basalt fiber reinforced composite materials, which together ensure that the component always maintains a linear elastic working state under high stress, and provide the system with fundamental protection against corrosion and electromagnetic safety.

[0025] During the on-site installation of this FRP (Fiberglass Reinforced Plastic) tensioned self-resetting inspection walkway system, corrugated sleeves 6 are first placed in the mold, and anchor steel end plates 5 are pre-embedded at both ends of the walkway slab. After the concrete is poured and cured, FRP bars 4 are inserted through the anchor steel end plate 5 and corrugated sleeve 6 at one end of the concrete walkway slab 1, passing through the entire slab, and exiting from the other end. Fixed end anchors 8 are installed at the fixed end of the FRP bars 4 for initial anchoring. At the tensioning end, a special jack is used to tension the FRP bars 4. After reaching the design pretension, the tensioning end anchor 7 is used to anchor them to the end anchor steel end plate 5. At this point, a single walkway slab becomes a precast component with internal prestress. On the planned inspection path, foundation 9 is constructed, foundation pad 3 is compacted, and then low-friction pad 2 is laid. Multiple precast concrete walkway slabs 1 are then hoisted into place according to the designed path. Each concrete walkway slab 1 forms a cohesive whole under pre-stress and rests on the low-friction pad 2. When uneven settlement occurs in foundation 9, the walkway slab at that location sinks under its own weight, forcing the FRP reinforcement 4 to undergo additional elongation deformation. Due to the presence of the low-friction pad 2, the system can coordinate the deformation as a whole. Throughout the process, the FRP reinforcement 4 remains in an elastic state. Once the settlement stops or slows down, the elastic restoring force of the FRP reinforcement 4 will pull the walkway slab in the sunken area back to its original position, thereby significantly reducing or even eliminating misalignment and depression, achieving a self-resetting function. Figure 3 As shown, there is a joint between two adjacent concrete walkway slabs 1. They are not rigidly connected. The overall coordinated deformation can be achieved by systematically relying on the non-rigid design of the low-friction pad layer 2 and the joint between the slabs. The two slabs are not affected by the tension anchor components and the protruding FRP bars 4, and can be arranged in an orderly and beautiful manner.

[0026] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A self-resetting FRP (fiberglass reinforced plastic) tensioned inspection walkway system, characterized in that, It includes multiple precast concrete walkway slabs (1), a low-friction pad layer (2), and a foundation pad layer (3); the concrete walkway slab (1) has at least one through-hole in the interior, and FRP bars (4) are inserted through the through-hole. The FRP bars (4) extend from the end of the concrete walkway slab (1). An anchoring steel end plate (5) is pre-embedded at the end of the concrete walkway slab (1). The anchoring steel end plate (5) has holes for the FRP bars (4) to pass through. The end of the concrete walkway slab (1) is also provided with a tensioning anchoring component, which acts on the anchoring steel end plate (5).

2. The FRP tensioned self-resetting inspection walkway system according to claim 1, characterized in that, The inner wall of the through-hole in the concrete walkway slab (1) is provided with a smooth corrugated sleeve (6).

3. The FRP tensioned self-resetting inspection walkway system according to claim 1, characterized in that, The tensioning anchorage assembly includes a tensioning end anchor (7) and a fixed end anchor (8); the fixed end anchor (8) and the tensioning end anchor (7) are respectively anchored at both ends of the FRP bar (4).

4. The FRP tensioned self-resetting inspection walkway system according to claim 1, characterized in that, The low-friction pad layer (2) is an engineering plastic board, a gravel layer, or a fine sand layer.

5. The FRP tensioned self-resetting inspection walkway system according to claim 4, characterized in that, The engineering plastic sheet is a high-density polyethylene sheet or a polytetrafluoroethylene sheet.

6. The FRP tensioned self-resetting inspection walkway system according to claim 1, characterized in that, The FRP reinforcement (4) is arranged in a single or multiple parallel arrangement.

7. The FRP tensioned self-resetting inspection walkway system according to claim 1, characterized in that, The FRP reinforcement (4) is made of glass fiber, carbon fiber or basalt fiber reinforced composite material.

Images