Composite geogrid based on optical fiber sensing

Abstract

The utility model provides a composite geogrid based on optical fiber sensing, which comprises a grid body comprising transverse grid branches and longitudinal grid branches, and the transverse grid branches and the longitudinal grid branches are staggered to form the grid body; the longitudinal bearing ribs are uniformly arranged on the longitudinal grid supports at intervals, V-shaped grooves are formed in the longitudinal bearing ribs, and the V-shaped grooves are formed in the length directions of the longitudinal bearing ribs; the optical fiber sensor is embedded into the V-shaped groove, and the outer circumferential surface of the optical fiber sensor is lower than the upper end surface of the longitudinal bearing rib; and the hot melting bonding layer coats the optical fiber sensor in the V-shaped groove through a hot melting process and is bonded in the longitudinal bearing rib. The longitudinal bearing ribs are arranged and matched with the V-shaped grooves, the optical fiber sensors are embedded into the V-shaped grooves, the deformation condition of a road soil body can be monitored in real time, the optical fiber sensors and the grating body are combined more tightly through the design of the V-shaped grooves, and the monitoring precision is improved.

Description

Technical Field

[0001] This utility model belongs to the field of civil engineering technology, specifically relating to a composite geogrid based on fiber optic sensing. Background Technology

[0002] Traditional geogrids, as an important soil reinforcement material, have been widely used in civil engineering fields such as roadbed reinforcement and slope protection. With the rapid development of optoelectronic technology and Internet of Things technology, composite geogrid products integrating fiber optic sensors have been applied in the market.

[0003] Currently, distributed optical fiber technology is widely used in construction and engineering monitoring for buildings, slopes, pile foundations, tunnels, and other projects. However, existing composite geogrids have the following drawbacks during use: 1. The optical fiber sensors are mechanically fixed to the geogrid, which results in strain transfer loss and deviations between the monitored data and the actual deformation; 2. Existing optical fiber sensors are directly pasted onto the geogrid surface, leading to damage to the sensors during compaction. These technical problems urgently need to be addressed by those skilled in the art. Utility Model Content

[0004] To address the aforementioned shortcomings of existing technologies, this utility model provides a composite geogrid based on fiber optic sensing, which features longitudinal bearing ribs and V-shaped grooves. The fiber optic sensor is embedded in the V-shaped groove, making the fiber optic sensor more tightly integrated with the geogrid body and improving monitoring accuracy.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A composite geogrid based on fiber optic sensing, comprising:

[0007] The grid body includes transverse grid supports and longitudinal grid supports, which are interwoven to form the grid body.

[0008] Longitudinal bearing ribs are evenly spaced on the longitudinal grid support, and V-shaped grooves are formed on the longitudinal bearing ribs, which are arranged along the length direction of the longitudinal bearing ribs.

[0009] An optical fiber sensor is embedded in the V-shaped groove, and the outer circumferential surface of the optical fiber sensor is lower than the upper end surface of the longitudinal bearing rib.

[0010] A hot-melt adhesive layer is used to wrap the fiber optic sensor in the V-shaped groove and bond it to the longitudinal support rib through a hot-melt process.

[0011] In a preferred embodiment of this invention, multiple optical fiber sensors are connected to a data acquisition device.

[0012] In a preferred embodiment of this utility model, the V-shaped groove has a depth of 1.2 mm and a width of 1.5 mm, and is formed by milling with a milling cutter.

[0013] In a preferred embodiment of this utility model, the longitudinal bearing rib is co-extruded from a polymer material and is hot-melted and fixed to the grid body.

[0014] In a preferred embodiment of the present invention, the V-shaped groove extends into the longitudinal grid support.

[0015] In a preferred embodiment of this utility model, the transverse grid support and the longitudinal grid support intersect perpendicularly to form multiple square areas.

[0016] In a preferred embodiment of the present invention, some or all of the longitudinal grid supports are provided with the longitudinal bearing ribs.

[0017] In a preferred embodiment of the present invention, the longitudinal bearing rib has a rectangular cross-section, which is the same length as the longitudinal grid support, and the thickness of the longitudinal bearing rib is half the thickness of the longitudinal grid support.

[0018] Beneficial effects:

[0019] This utility model discloses a composite geogrid based on fiber optic sensing. Longitudinal bearing ribs are set on the geogrid body to enhance the bearing capacity of the longitudinal geogrid support, enabling it to better withstand external loads. The longitudinal bearing ribs are made of polymer material co-extrusion molding and fixed to the longitudinal geogrid support through hot-melt process, further improving the overall structural strength and stability.

[0020] The longitudinal bearing ribs of the rectangular cross section are the same length as the longitudinal grid support, and their thickness is half the thickness of the longitudinal grid support, which optimizes the deformation resistance of the grid body and can effectively resist the shear deformation of the soil.

[0021] The fiber optic sensor of this invention is embedded in the V-shaped groove of the longitudinal bearing rib, which can monitor the deformation of the longitudinal bearing rib in real time, thereby indirectly reflecting the deformation state of the grid body and the soil. The V-shaped groove design makes the fiber optic sensor more tightly integrated with the grid body, improving the monitoring accuracy, while protecting the fiber optic sensor from damage during construction.

[0022] The composite grid of this utility model features a simple and convenient hot-melt fixing process between the longitudinal load-bearing ribs and the longitudinal grid supports, which reduces construction steps and improves construction efficiency; the embedding and hot-melt bonding process of the fiber optic sensor is easy to operate. Attached Figure Description

[0023] Figure 1 A schematic diagram of a composite geogrid based on fiber optic sensing provided by this utility model;

[0024] Figure 2 A top view of a composite geogrid based on fiber optic sensing provided by this utility model;

[0025] Figure 3 A front view of a composite geogrid based on fiber optic sensing provided for this utility model;

[0026] Figure 4 The present utility model Figure 3 A magnified view of part A.

[0027] In the diagram: 1. Grid body, 11. Horizontal grid support, 12. Vertical grid support;

[0028] 2 longitudinal load-bearing ribs;

[0029] 3. Fiber optic sensors;

[0030] 4. Hot melt adhesive layer. Detailed Implementation

[0031] 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 skilled in the art without creative effort are within the protection scope of the present utility model.

[0032] like Figure 1-4 As shown, the present invention provides a composite geogrid based on fiber optic sensing, comprising:

[0033] The grid body 1 includes a transverse grid support 11 and a longitudinal grid support 12, which are interwoven to form the grid body 1.

[0034] Longitudinal bearing ribs 2 are evenly spaced on the longitudinal grid support 12. V-shaped grooves are provided on the longitudinal bearing ribs 2, and the V-shaped grooves are arranged along the length direction of the longitudinal bearing ribs 2.

[0035] The fiber optic sensor 3 is embedded in the aforementioned V-shaped groove, and the outer circumferential surface of the fiber optic sensor 3 is lower than the upper end surface of the longitudinal bearing rib 2.

[0036] The hot-melt adhesive layer 4 is used to cover the fiber optic sensor 3 in the V-shaped groove and bond it to the longitudinal bearing rib 2 through a hot-melt process.

[0037] The working principle and beneficial effects of the above embodiments are as follows:

[0038] The grid body 1 of this utility model forms a mesh-like load-bearing structure through the interlaced structure of transverse grid supports 11 and longitudinal grid supports 12, which is used to bear external loads.

[0039] The fiber optic sensor 3 embedded in the V-shaped groove of the longitudinal bearing rib 2 will undergo strain changes as the longitudinal bearing rib 2 deforms. Based on the optical properties of optical fiber, when the fiber optic sensor 3 is subjected to strain, the optical signal in the optical fiber will change. By detecting these changes in optical signal, the deformation of the longitudinal bearing rib 2 can be monitored in real time, thereby indirectly reflecting the deformation state of the grid body 1 and the soil.

[0040] The hot-melt adhesive layer 4 is used to cover the fiber optic sensor 3 and bond it to the longitudinal support rib 2 through a hot-melt process. On the one hand, it fixes the fiber optic sensor 3, making it stably embedded in the longitudinal support rib 2 and preventing it from shifting or loosening during use. On the other hand, the hot-melt adhesive layer 4 can tightly combine the fiber optic sensor 3 with the longitudinal support rib 2, ensuring that the deformation between the two is coordinated and consistent, and ensuring that the fiber optic sensor 3 can accurately sense the deformation of the longitudinal support rib 2.

[0041] The longitudinal bearing rib 2 of this utility model enhances the bearing capacity of the longitudinal grid support 12, enabling it to better withstand external loads. At the same time, the fiber optic sensor 3 is embedded in the V-shaped groove and fixed by the hot melt adhesive layer 4, which further improves the overall stability of the grid body 1 and enables it to better adapt to complex soil environments and construction conditions. The longitudinal bearing rib 2 shares the weight load and impact load on the fiber optic sensor 3 during winding, laying and use.

[0042] The integrated design of the optical fiber and the grid in this invention can reduce construction steps, improve construction efficiency, and also reduce the risks caused by improper installation of monitoring equipment.

[0043] In one embodiment,

[0044] Multiple fiber optic sensors 3 are connected to a data acquisition device. The multiple fiber optic sensors 3 are distributed on different longitudinal bearing ribs 2 to form a distributed monitoring network. The data acquisition device can collect light signal change data from each sensor in real time by connecting multiple fiber optic sensors 3, thereby indirectly reflecting the deformation state of the grid body 1 and the soil.

[0045] In one embodiment,

[0046] The aforementioned V-shaped groove has a depth of 1.2 mm and a width of 1.5 mm. It is formed by milling with a milling cutter. The V-shaped groove formed by milling with a milling cutter can ensure high machining accuracy and surface quality, reduce the roughness of the inner surface of the groove, thereby reducing the friction force experienced by the fiber optic sensor 3 during the embedding process, protecting the outer surface of the fiber optic sensor 3, and providing sufficient installation space for the fiber optic sensor 3.

[0047] In one embodiment,

[0048] The aforementioned longitudinal bearing rib 2 is co-extruded from polymer material to achieve efficient production of the longitudinal bearing rib 2 and ensure its dimensional accuracy and structural consistency. It is hot-melt fixed to the grid body 1 to achieve a firm bond between the two and ensure that it will not loosen or separate during use.

[0049] Hot-melt fixation enhances the connection strength between the longitudinal bearing rib 2 and the geogrid body 1, while also achieving the integration of the overall structure and improving the overall stability of the composite geogrid.

[0050] In one embodiment,

[0051] The aforementioned V-shaped groove extends into the longitudinal grid support 12; with the V-shaped groove extending into the longitudinal grid support 12, the fiber optic sensor 3 can more directly sense the deformation of the longitudinal grid support 12, reducing the impact of possible slight deformation differences between the longitudinal bearing rib 2 and the longitudinal grid support 12 on the monitoring results, thereby improving the monitoring accuracy.

[0052] In one embodiment,

[0053] The aforementioned transverse grid support 11 and longitudinal grid support 12 intersect perpendicularly to form multiple square areas; the uniform distribution of the square areas makes the grid body 1 have similar mechanical properties in all directions, and can uniformly bear the soil pressure.

[0054] In one embodiment,

[0055] The longitudinal bearing ribs 2 are provided on some or all of the longitudinal grid supports 12. The longitudinal bearing ribs 2 are reasonably arranged according to the application scenario. For example, in slope reinforcement projects, longitudinal bearing ribs 2 can be set on some of the longitudinal grid supports 12 to strengthen the key stress areas of the slope. In roadbed reinforcement projects, longitudinal bearing ribs 2 can be set on all the longitudinal grid supports 12 to achieve overall reinforcement and ensure the stability and bearing capacity of the roadbed during long-term use.

[0056] In one embodiment,

[0057] The longitudinal bearing rib 2 has a rectangular cross-section, is the same length as the longitudinal grid support 12, and has a uniform thickness and width, ensuring the consistency of mechanical properties of both along the entire length, so that the grid body 1 can bear the load uniformly in all directions; the thickness of the longitudinal bearing rib 2 is half the thickness of the longitudinal grid support 12; the thickness design of the longitudinal bearing rib 2 can effectively enhance the deformation resistance of the longitudinal grid support 12, and the thickness ratio of the longitudinal bearing rib 2 to the longitudinal grid support 12 allows the longitudinal bearing rib 2 to form a good mechanical synergy with the longitudinal grid support 12, enhancing the stability of the overall structure.

[0058] In summary:

[0059] This utility model discloses a composite geogrid based on fiber optic sensing. Longitudinal bearing ribs are set on the geogrid body to enhance the bearing capacity of the longitudinal geogrid support and enable it to better withstand external loads. The longitudinal bearing ribs are made of polymer material co-extrusion molding and are fixed to the longitudinal geogrid support through hot melt process, which further improves the overall structural strength and stability.

[0060] The longitudinal bearing ribs of the rectangular cross section are the same length as the longitudinal grid support, and their thickness is half the thickness of the longitudinal grid support, which optimizes the deformation resistance of the grid body and can effectively resist the shear deformation of the soil.

[0061] The fiber optic sensor of this invention is embedded in the V-shaped groove of the longitudinal bearing rib, which can monitor the deformation of the longitudinal bearing rib in real time, thereby indirectly reflecting the deformation state of the grid body and the soil. The design of the V-shaped groove makes the fiber optic sensor more tightly integrated with the grid body, improving the monitoring accuracy.

[0062] The composite grid of this utility model features a simple and convenient hot-melt fixing process between the longitudinal load-bearing ribs and the longitudinal grid supports, which reduces construction steps and improves construction efficiency; the embedding and hot-melt bonding process of the fiber optic sensor is easy to operate.

[0063] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. The terms "front," "back," "left," and "right" used in the text are not specific and are mainly for more intuitive illustration of the technical solution, and do not constitute a limitation. Those skilled in the art should understand that the above embodiments are only for illustrating the technical concept and features of this utility model, and their purpose is to enable those skilled in the art to understand the content of this utility model and implement it. They should not be used to limit the scope of protection of this utility model. All equivalent changes or modifications made according to the spirit and essence of this utility model should be included within the scope of protection of this utility model.

Claims

1. A fiber optic sensing based composite geogrid, characterized by: include The grid body (1) includes transverse grid supports (11) and longitudinal grid supports (12), wherein the transverse grid supports (11) and longitudinal grid supports (12) are interwoven to form the grid body (1); Longitudinal bearing ribs (2) are evenly spaced on the longitudinal grid support (12), and V-shaped grooves are provided on the longitudinal bearing ribs (2), which are arranged along the length direction of the longitudinal bearing ribs (2). An optical fiber sensor (3) is embedded in the V-shaped groove, and the outer circumferential surface of the optical fiber sensor (3) is lower than the upper end surface of the longitudinal bearing rib (2). A hot-melt adhesive layer (4) is used to cover the fiber optic sensor (3) in the V-shaped groove and bond it to the longitudinal support rib (2) by hot-melt process.

2. The fiber optic sensing based composite geogrid according to claim 1, wherein: The multiple fiber optic sensors (3) are connected to a data acquisition device.

3. The fiber optic sensor based composite geogrid according to claim 1, wherein: The V-shaped groove has a depth of 1.2 mm and a width of 1.5 mm, and is formed by milling with a milling cutter.

4. The fiber optic sensor based composite geogrid according to claim 1, wherein: The longitudinal bearing rib (2) is co-extruded from a polymer material and is hot-melted and fixed to the grid body (1).

5. The fiber optic sensing based composite geogrid according to claim 1, wherein: The V-shaped groove extends into the longitudinal grid support (12).

6. The fiber optic sensing based composite geogrid according to claim 1, wherein: The horizontal grid support (11) and the vertical grid support (12) intersect vertically to form multiple square areas.

7. The fiber optic sensor based composite geogrid according to claim 1, wherein: The longitudinal bearing ribs (2) are provided on some or all of the longitudinal grid supports (12).

8. The fiber optic sensor based composite geogrid according to claim 5, wherein: The longitudinal bearing rib (2) has a rectangular cross section, which is the same length as the longitudinal grid support (12), and the thickness of the longitudinal bearing rib (2) is half the thickness of the longitudinal grid support (12).

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