Polyester geogrid with protective layer
By covering the polyester geogrid strip with a protective layer and adopting a composite structure, the problems of welding damage and soil extrusion were solved, the tensile strength of the nodes and the overall mechanical properties were improved, and the breakage rate was reduced.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2026-01-28
- Publication Date
- 2026-04-07
AI Technical Summary
Polyester geogrids are first damaged at the joints. The welding process damages the molecular chain structure, the tensile strength at the joints is weaker than that of the geogrid itself, and it is easily punctured by stones when the soil is compressed, resulting in a high breakage rate.
A protective layer is wrapped around the outside of the main body, and a composite grid structure is formed by welding. The protective layer serves as a buffer layer for the welded parts and the soil. It is made of thermoplastic material that can be melt-bonded, and pits and ridges are set to enhance the bonding force. Through holes are opened at the nodes to embed inserts and reinforcing wires to improve the connection strength.
It effectively avoids welding damage, reduces the loss of tensile strength at the joint, reduces the damage to the belt body caused by soil extrusion, maintains a low breakage rate, and improves the tensile strength of the joint and the overall mechanical properties.
Smart Images
Figure CN224092456U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to geogrid technical field, concretely relates to a polyester geogrid with protective layer. BACKGROUND
[0002] Polyester geogrid is the civil engineering synthetic material that polyester is main material, join the anti-aging agent and so on auxiliary agent and make, adopt low multiple mechanical tensile and form warp and weft rib (i.e. geogrid belt) and be welded into shape by ultrasonic wave. Because its high strength, corrosion resistance, anti creep performance is excellent, is widely used in highway, railway, dam and soft foundation reinforcement etc. engineering.
[0003] However, the mechanical test finds that the polyester geogrid first occurs damage at node part, and the node becomes the mechanical weak point. Analysis finds that the existing ultrasonic welding directly acts on the polyester belt body, and the high-frequency vibration and local high temperature generated in the welding process can destroy the polyester molecular chain structure, and cause the surface layer of the belt body to be eroded and the fiber to be broken, so that the tensile strength of the node is obviously weaker than the tensile strength of the belt body, and the overall mechanical property of the geogrid is affected. In addition, when the polyester geogrid is put into use, there are usually stones in the surrounding soil, and when the soil is compacted, the sharp edges and corners of the stones can easily pierce the belt body, so that the tensile strength of the belt body is reduced, and the use loss rate of the geogrid is high.
[0004] Therefore, it is urgent to improve the existing polyester geogrid to improve the mechanical property of the geogrid at the node, so that the overall tensile strength of the geogrid is closer to the tensile strength of the belt body. CONTENT OF THE UTILITY MODEL
[0005] The utility model aims at providing a polyester geogrid with a protective layer, which can at least partially overcome the above technical problems, protect the belt body through the protective layer, form a composite geogrid belt structure, on the one hand, reduce the influence of welding on the belt body (avoid damage to the belt body during welding), on the other hand, use the protective layer as a buffer layer between the belt body and the surrounding soil, and reduce the damage to the belt body caused by the extrusion of the soil.
[0006] The utility model provides a polyester geogrid with a protective layer, the geogrid belt of polyester geogrid includes belt body and protective layer, the protective layer is covered in the thickness direction both sides of belt body and the width direction both sides, the protective layer is fixedly connected with belt body.
[0007] Further, the first recess and / or the first convex rib are arranged on the two sides of the thickness direction of the belt body.
[0008] Further, the second recess and / or the second convex rib are arranged on the two sides of the thickness direction of the protective layer.
[0009] Further, the protective layer is a thermoplastic material that can be fusion bonded.
[0010] Further, at the node position of the polyester geogrid, the protective layer is welded and fixedly connected between the grid belts to form a welding portion in the protective layer.
[0011] Further, the thickness of the protective layer is 0.4mm to 1mm.
[0012] Further, the belt body is provided with a through hole in the thickness direction, and an embedded body is embedded in the through hole; the embedded body is fixedly connected with the protective layer at both ends of the through hole.
[0013] Further, the through hole is a strip-shaped hole with a width of 0.1mm to 0.3mm, and the length direction of the strip-shaped hole is parallel to the length direction of the belt body.
[0014] Further, the through hole is located at the node position of the polyester geogrid.
[0015] Further, a reinforcing wire is clamped inside the belt body, and the length direction of the reinforcing wire is parallel to the length direction of the belt body; at least one reinforcing wire penetrates through the through hole.
[0016] Compared with the prior art, the utility model has the following advantages and beneficial effects:
[0017] 1. The polyester geogrid with a protective layer provided by the embodiment of the present disclosure can cover the protective layer on both sides in the thickness direction and both sides in the width direction of the belt body, so that the protective layer is in the form of "sleeving" outside the belt body, the protective layer is not easy to fall off from the belt body, the damage to the belt body caused by welding can be effectively avoided, the tensile performance of the belt body at the node position is ensured, and in the process of using the geogrid, the stones in the soil directly contact the protective layer, and the belt body is difficult to be pierced, so that the geogrid can always maintain a low breakage rate in the process of using.
[0018] 2. The polyester geogrid with a protective layer provided by the embodiment of the present disclosure is provided with a first recess and / or a first convex rib on both sides in the thickness direction of the belt body, so that the protective layer covering the belt body is combined more closely with the belt body, the protective layer and the belt body at the node position are prevented from being separated when the geogrid is pulled, a second recess and / or a second convex rib are arranged on both sides in the thickness direction of the protective layer, so that the friction between the grid belt and the surrounding soil is increased when the geogrid is used, and the geogrid is combined more closely with the surrounding soil.
[0019] 3. The polyester geogrid with a protective layer provided by the embodiment of the present application, by means of the through holes on the belt body, the connection between the protective layers on both sides of the belt body in the thickness direction is increased, so that the connection between the protective layer and the belt body is more compact. BRIEF DESCRIPTION OF DRAWINGS
[0020] The drawings described herein are used to provide further understanding of the embodiments of the present application, form a part of the present application, and do not constitute a limitation on the embodiments of the present application. In the drawings:
[0021] Figure 1 The figure is a schematic view of the three-dimensional structure of the polyester geogrid with a protective layer according to the embodiment of the present application;
[0022] Figure 2 The figure is a schematic view of the three-dimensional structure of the polyester geogrid with a protective layer according to the embodiment of the present application; Figure 1 The figure is a partial enlarged view of the A area;
[0023] Figure 3 The figure is a node cross-sectional view of the polyester geogrid with a protective layer according to the embodiment of the present application;
[0024] Figure 4 The figure is a cross-sectional view of the grid belt according to the embodiment of the present application.
[0025] Markings in the drawings and corresponding component names:
[0026] 1-geogrid belt; 11-belt body; 111-through hole; 112-strengthening wire; 12-protective layer; 2-welding part; 3-embedded body. DETAILED DESCRIPTION
[0027] In order to make the purpose, technical scheme and advantages of the present application more clear and explicit, the present application will be further described in detail below in combination with embodiments and drawings, the schematic embodiments of the present application and the description thereof are only used to explain the present application, and do not constitute a limitation on the present application. It should be noted that the present application has been in the actual research and development stage.
[0028] In the existing polyester geogrid, the mutual connection between the belt bodies is usually realized at the node by means of welding means (such as ultrasonic welding). However, during the welding process, the fibers at the melted part of the belt body are disconnected, and the welding part after re-solidification cannot reconnect the disconnected fibers, resulting in a decrease in the tensile strength of the belt body, so that the node of the polyester geogrid becomes a weak point in mechanical properties; in addition, during the use of such polyester geogrid, when the surrounding soil is extruded, the stones in the soil are easy to pierce the belt body, causing further decrease in the tensile strength of the polyester geogrid.
[0029] To this end, the utility model provides a kind of polyester geogrid with protective layer, it is covered protective layer outside band body, on the one hand, the interconnection between band body at node is realized using protective layer, band body can be effectively avoided damage in welding process, ensure that the tensile property of band body at node is not damaged, on the other hand, when geogrid is used, it is directly contacted by stone in soil when being extruded by surrounding soil, and protective layer is difficult to pierce band body, in turn, it can ensure that geogrid always maintains low breakage rate in the process of use.
[0030] Embodiment 1:
[0031] As Figures 1 to 4 shown, the utility model provides a kind of polyester geogrid with protective layer, the grid belt 1 of the polyester geogrid includes band body 11 and protective layer 12;
[0032] The protective layer 12 is covered on both sides in the thickness direction of the band body 11 and both sides in the width direction, and the protective layer 12 is fixedly connected with the band body 11.
[0033] By covering protective layer 12 on both sides in the thickness direction of band body 11 and both sides in the width direction, the protective layer 12 is in the form of "suits" outside the band body 11, so that the protective layer 12 is not easy to fall off from the band body 11 (i.e. the whole grid belt 1 is not easy to appear the condition that the band body 11 is separated from the protective layer 12), specifically, the protective layer 12 wants to fall off from the band body 11, not only to overcome the adhesion of the protective layer 12 adhered to the band body 11, but also need to pull off the protective layer 12 covered on both sides in the width direction of the band body 11, and it is difficult to separate.
[0034] Specifically, the protective layer 12 is a thermoplastic material that can be fused, such as HDPE (high-density polyethylene), EVA (ethylene-vinyl acetate copolymer), TPU (thermoplastic polyurethane elastomer), etc. In a specific practice of the utility model embodiment, HDPE is used as the protective layer 12, and the HDPE is covered on both sides in the thickness direction and both sides in the width direction of the band body 11 by the process of co-extrusion.
[0035] Preferably, at the node position of the polyester geogrid, the grid belt 1 is fixedly connected by protective layer 12 welding and forms a welding portion 2, and the welding portion 2 is located in the protective layer 12.
[0036] The thickness of the protective layer 12 is 0.4mm to 1mm.
[0037] Accordingly, at the nodes of the geogrid, the mutual connection between the grid belts 1 is achieved by welding the protective layers 12, and a meshed geogrid is formed. On the one hand, the welding process can effectively avoid damage to the belt body 11, and ensure that the tensile performance of the belt body 11 at the nodes is not damaged. On the other hand, during the use of the geogrid, when the grid belt 1 is extruded by the surrounding soil, the stones in the soil directly contact the protective layer 12, and it is difficult to pierce the belt body 11, thereby ensuring that the geogrid always has a low breakage rate during use.
[0038] Notably, by cladding the protective layer 12 on both sides in the thickness direction and both sides in the width direction of the belt body 11, the protective layer 12 is in the form of “sleeving” outside the belt body 11. In the node tensile test of the geogrid (the two grid belts 1 at the node are pulled in the opposite direction along the thickness direction of the grid belt 1), in order to damage the node of the polyester geogrid with a protective layer provided in the embodiment, either the welding part 2 formed by welding between the protective layers 12 needs to be damaged, or the adhesion of the protective layer 12 to the belt body 11 needs to be overcome and the protective layer 12 cladded on both sides in the width direction of the belt body 11 needs to be broken. This makes the tensile performance of the node of the polyester geogrid with a protective layer provided in the embodiment far superior to that of ordinary polyester geogrid.
[0039] Embodiment 2:
[0040] This embodiment is based on Embodiment 1, and the difference is that in this embodiment:
[0041] First recesses and / or first ribs are arranged on both sides in the thickness direction of the belt body 11.
[0042] In the specific practice of the foregoing, in which HDPE is used as the protective layer 12, in the node tensile test of the geogrid, the damage process at the node is: the protective layer 12 at the node is peeled off from the belt body 11, the protective layer 12 cladded on both sides in the width direction of the belt body 11 at the node is broken, and the two grid belts 1 at the node are separated. The polyester geogrid with a protective layer provided in this embodiment, by arranging first recesses and / or first ribs on both sides in the thickness direction of the belt body 11, can make the protective layer 12 cladded on the belt body 11 more closely combined with the belt body 11, and avoid separation of the protective layer 12 and the belt body 11 at the node part when the geogrid is pulled.
[0043] Embodiment 3:
[0044] This embodiment is based on Embodiment 1, and the difference is that in this embodiment:
[0045] Second recesses and / or second ribs are arranged on both sides in the thickness direction of the protective layer 12.
[0046] Based on this, the polyester geogrid with the protective layer provided in this embodiment can increase the friction between the grid belt 1 and the surrounding soil when in use, and further make the geogrid and the surrounding soil more closely combined.
[0047] Embodiment 4:
[0048] This embodiment is based on embodiment 1, and the difference is that, in this embodiment:
[0049] The belt body 11 is provided with a through hole 111 in the thickness direction, and an embedded body 3 is embedded in the through hole 111;
[0050] The embedded body 3 and the protective layer 12 at both ends of the through hole 111 are fixedly connected.
[0051] Accordingly, the protective layer 12 needs to be separated from the embedded body 3 under the action of external force, and the protective layer 12 needs to be peeled off from the belt body 11 and the protective layer 12 wrapped on both sides of the belt body 11 in the width direction needs to be broken. Obviously, in the polyester geogrid with the protective layer provided in this embodiment, the connection between the protective layer 12 and the belt body 11 is more closely.
[0052] Preferably, the through hole 111 is located at the node position of the polyester geogrid. The embedded body 3 and the protective layer 12 are made of the same material. For example, the extrusion coating process is adopted, and the extrusion pressure or the extrusion amount of the protective layer 12 material near the through hole 111 is appropriately increased, so as to ensure that the through hole 111 is filled.
[0053] Accordingly, the node strength of the polyester geogrid with the protective layer provided in this embodiment is further strengthened. In a specific practice of this embodiment, HDPE is used as the protective layer 12. Although the through hole 111 causes damage to the tensile strength of the belt body 11 itself, the node tensile strength of the polyester geogrid with the protective layer is greatly improved through the node tensile test.
[0054] Embodiment 5:
[0055] This embodiment is based on embodiment 4, and the difference is that, in this embodiment:
[0056] The through hole 111 is a strip-shaped hole with a width of 0.1mm to 0.3mm, and the length direction of the strip-shaped hole is parallel to the length direction of the belt body 11.
[0057] Accordingly, the through hole 111 opened in this embodiment can reduce the damage to the tensile strength of the belt body 11 as much as possible due to the smaller size in the width direction of the belt body 11.
[0058] Preferably, a reinforcing wire 112 is clamped inside the belt body 11, and the length direction of the reinforcing wire 112 is parallel to the length direction of the belt body 11. The reinforcing wire 112 is preferably a 0.1mm to 0.2mm diameter nylon wire.
[0059] Accordingly, the polyester geogrid with a protective layer provided by the embodiment can strengthen the tensile strength of the belt body 11 by clamping the reinforcing wire 112 inside the belt body 11, and further compensate for the tensile strength decrease of the belt body 11 caused by the through hole 111.
[0060] More preferably, at least one of the reinforcing wires 112 penetrates the through hole 111.
[0061] Accordingly, the reinforcing wire 112 can also play a restraining role on the embedded body 3, and further help to improve the tensile strength at the node of the polyester geogrid with a protective layer.
[0062] The above specific embodiments have further detailed the purpose, technical solutions and beneficial effects of the present application. It should be understood that the above description is only a specific embodiment of the present application, and is not intended to limit the protection scope of the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.
Claims
1. A polyester geogrid with a protective layer, characterized in that, The geogrid strip (1) of the polyester geogrid includes a strip body (11) and a protective layer (12). The protective layer (12) covers both sides of the belt body (11) in the thickness direction and both sides in the width direction, and the protective layer (12) is fixedly connected to the belt body (11). At the node position of the polyester geogrid, the geogrid strips (1) are welded and fixedly connected by a protective layer (12) to form a welded part (2), which is located inside the protective layer (12); The belt body (11) has a through hole (111) along the thickness direction, and an insert (3) is embedded in the through hole (111). The insert (3) is fixedly connected to the protective layer (12) at both ends of the through hole (111).
2. The polyester geogrid according to claim 1, characterized in that, First recesses and / or first protrusions are provided on both sides of the thickness direction of the belt body (11).
3. The polyester geogrid according to claim 1, characterized in that, A second recess and / or a second protrusion are provided on both sides of the protective layer (12) in the thickness direction.
4. The polyester geogrid according to claim 1, characterized in that, The protective layer (12) is a thermoplastic material that can be melt-bonded.
5. The polyester geogrid according to claim 4, characterized in that, The protective layer (12) is selected from one of high-density polyethylene, ethylene-vinyl acetate copolymer, and thermoplastic polyurethane elastomer.
6. The polyester geogrid according to claim 1, characterized in that, The thickness of the protective layer (12) is 0.4 mm to 1 mm.
7. The polyester geogrid according to claim 1, characterized in that, The through hole (111) is a strip-shaped hole with a width of 0.1mm-0.3mm, and the length direction of the strip-shaped hole is parallel to the length direction of the belt body (11).
8. The polyester geogrid according to claim 1, characterized in that, The through hole (111) is located at the node position of the polyester geogrid.
9. The polyester geogrid according to claim 1, characterized in that, A reinforcing wire (112) is sandwiched inside the belt body (11), and the length direction of the reinforcing wire (112) is parallel to the length direction of the belt body (11). At least one of the reinforcing wires (112) passes through the through hole (111).
10. The polyester geogrid according to claim 9, characterized in that, The reinforcing wire (112) is a Dyneema wire with a diameter of 0.1 mm to 0.2 mm.