Uniaxially stretched geogrid and its manufacturing device

Abstract

The present invention discloses a unidirectional stretch geogrid and a manufacturing device thereof, and belongs to the technical field of plastic geogrids. The unidirectional stretch geogrid comprises transverse grid bars and longitudinal grid bars, which cross each other to form a number of regularly arranged rectangular meshes, with a mesh width of 20-50 mm and a mesh length of 200-500 mm; the thickness of the transverse grid bars is 3-20 mm. The present invention is applied to the field of soil reinforcement in engineering construction, and solves the problems that the existing geogrid is applied to the reinforcement of large-size soil in a poor environment, and has a small pull-out force and poor reinforcement performance, and proposes a technical method for a geogrid product and a manufacturing device thereof which is suitable for the reinforcement of large-size soil, has high pull-out resistance, and has excellent reinforcement performance.

Description

Technical Field

[0001] The invention belongs to the technical field of plastic geogrids, and in particular relates to a unidirectional stretch geogrid and a manufacturing device thereof. Background Art

[0002] Plastic geogrids are mainly used in the field of soil reinforcement in engineering construction. With the advancement of engineering technology, there is an increasing need for high-specification integrally stretched plastic geogrids. When geogrids are used to reinforce soil structures, the friction characteristics between the geogrid and the surrounding soil have an important impact on the stability of the structure. Plastic stretched geogrids use high-density polyethylene or polypropylene as raw materials. The plane mesh structure geogrid is formed by plasticizing, extruding, punching, and integrally stretching. It can effectively enhance the stability of reinforced soil and improve the bearing capacity of the foundation.

[0003] Unidirectional geogrids have excellent reinforcement and durability properties, but when existing unidirectional geogrids interact with large-particle soil, their movement deformation and micro-change restriction effects are poor, and their friction properties are significantly reduced; three-dimensional bidirectional geogrids and three-dimensional bidirectional geogrids increase the bite force between the land and the geogrid on the horizontal plane to a certain extent, however, the production process of three-dimensional bidirectional geogrids and three-dimensional bidirectional geogrids is cumbersome, the production efficiency is low and the processing is difficult.

[0004] Whether it is the above-mentioned unidirectional tensile geogrid or the three-dimensional bidirectional geogrid or the three-dimensional bidirectional geogrid, its inner hole diameter is small and its tensile shear resistance is poor when used in a large-grained soil environment. Summary of the invention

[0005] In view of the shortcomings of the prior art, the main problem to be solved by the present invention is to overcome the problem that the existing geogrids cannot be used in large-particle soil environments and have low pull-out force, and to propose a unidirectional stretch geogrid with high pull-out force that can be used in large-particle soil environments and a manufacturing device thereof.

[0006] In order to solve the technical problem, the technical solution adopted by the present invention is:

[0007] On one hand, the present invention provides a unidirectional stretch geogrid, comprising transverse grid bars and longitudinal grid bars, wherein the transverse grid bars and longitudinal grid bars cross to form a plurality of regularly arranged rectangular meshes, wherein the mesh width is 20-50 mm, and the mesh length is 200-500 mm; the thickness of the transverse grid bars is 3-20 mm.

[0008] Preferably, the transverse grid bar has a first groove on at least one side parallel to the plane where the mesh holes are located.

[0009] Preferably, the thickness of the transverse grille bars on both sides of the first groove is 0.5-5 mm greater than the thickness of the transverse grille bars in the middle of the first groove.

[0010] On the other hand, the present invention also provides a device for manufacturing the unidirectional stretch geogrid described in any of the above technical solutions, comprising an upper roller, a middle roller and a lower roller arranged in sequence from top to bottom, and the middle roller is evenly provided with a second groove arranged parallel to the center line of the middle roller in the circumferential direction.

[0011] Preferably, the width of the second groove is 5-30 mm, the depth is 1-10 mm, and the spacing between adjacent second grooves is 10-60 mm.

[0012] Preferably, the second groove has a protrusion at the bottom, and the height of the protrusion is smaller than the depth of the second groove.

[0013] Preferably, the upper roller is evenly provided with a third groove parallel to the center line of the upper roller in the circumferential direction, the third groove has the same size as the second groove, and the third groove is arranged corresponding to the second groove.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. The present invention provides a unidirectional stretch geogrid. Compared with unidirectional grids with ordinary apertures, the large-aperture grid has a better bite-embedded effect with fillers with larger particles and a higher interaction coefficient. Under the premise of ensuring the stability of the retaining wall slope, the strength and number of geogrid products can be reduced, thereby significantly reducing the project cost and having good economic benefits. The large-aperture grid can be used to obtain local materials, avoiding the damage to the environment caused by transporting fill soil outside, and having good social benefits. The unidirectional stretch geogrid is stretched at a low ratio in the transverse direction, so that the molecules are oriented on the transverse ribs, so that the geogrid has a higher transverse strength.

[0016] 2. On the other hand, the present invention provides a device for manufacturing the unidirectional stretch geogrid described in any of the above technical solutions, which realizes the production of integrally stretched plastic geogrid, has a stable and mature production process, high production efficiency, and large-aperture grids that effectively save production costs while ensuring high strength. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of the unidirectional tensile geogrid structure provided by an embodiment of the present invention, wherein a is a main view and b is a top view;

[0018] Figure 2 A schematic diagram of the structure of a device provided by an embodiment of the present invention;

[0019] In the above figures: 1, mesh; 2, transverse grille bars; 21, first groove; 3, longitudinal grille bars; 4, upper roller; 5, middle roller; 51, second groove; 6, lower roller. DETAILED DESCRIPTION

[0020] The present invention is described in detail below by way of exemplary embodiments. However, it should be understood that elements, structures, and features in one embodiment may also be beneficially combined in other embodiments without further description.

[0021] In the description of the present invention, it should be understood that the terms "upper", "lower" and the like indicate positions or location relationships based on the attached Figure 1 The orientation or positional relationship shown is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0022] The terms "first", "second", and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Thus, a feature defined as "first", "second", and "third" may explicitly or implicitly include one or more of the features.

[0023] Example: Figure 1As shown, the present invention proposes a unidirectional tensile geogrid, including transverse grid bars 2 and longitudinal grid bars 3, which cross and enclose a number of regularly arranged rectangular meshes 1, the mesh 1 width is 20-50mm, the mesh 1 length is 200-500mm; the thickness of the transverse grid bars 2 is 3-20mm. In this embodiment, the thickness of the transverse grid bars 2 is 1.5-3 times that of the existing geogrid, which greatly improves the bite force of the geogrid. In addition, since the unidirectional geogrid provided by this embodiment is larger in size, compared with the unidirectional grid with ordinary aperture, the large aperture grid has a better bite and embedding effect with the filler with larger particles, and has a higher interaction coefficient. Under the premise of ensuring the stability of the retaining wall slope, the number of geogrid products used can be reduced, thereby significantly reducing the project cost and having good economic benefits; in many reinforced slope projects, when using unidirectional grids with ordinary apertures, the larger particle size gravel mined on site does not meet the requirements of reinforced slope fillers, and the large particle size fillers need to be crushed, which is time-consuming and labor-intensive, and adds a lot of additional project costs, or the fill that meets the project requirements is transported out, and the excavated fill damages the surrounding environment. The use of large aperture grids can achieve local materials, avoid the damage to the environment caused by transporting fill, and has good social benefits. It should be noted that the unidirectional geogrid is stretched at a low ratio in the transverse direction, so that the molecules are oriented on the transverse ribs, so that the unidirectional geogrid reaches a higher strength in the transverse direction.

[0024] In order to save materials while ensuring the bite force of the geogrid, the transverse grid bars 2 have a first groove 21 on at least one side parallel to the plane where the meshes 1 are located.

[0025] In order to ensure that the crossbar has sufficient strength to engage with the soil, the thickness of the transverse grille bars 2 on both sides of the first groove 21 is 0.5-5 mm greater than the thickness of the transverse grille bars 2 in the middle of the first groove 21 .

[0026] On the other hand, the present invention provides a unidirectional stretch geogrid device for manufacturing the above-mentioned embodiment, comprising an upper roller 4, a middle roller 5 and a lower roller 6 arranged in sequence from top to bottom, and the middle roller 5 is evenly provided with a second groove 51 arranged parallel to the center line of the middle roller 5 in the circumferential direction. The device provided by this embodiment realizes the manufacture of the overall unidirectional stretch geogrid, and at the same time, by providing the second groove 51 on the middle roller 5, the thickness of the geogrid is increased to a certain extent, and the bite force of the geogrid is improved. In addition, the device realizes the production of the overall stretch plastic geogrid, has a stable and mature production process, high production efficiency, and a large-aperture grid effectively saves production costs while ensuring high strength.

[0027] In order to ensure the bite force of the manufactured geogrid, the width of the second groove 51 is 5-30 mm, the depth is 1-10 mm, and the interval between adjacent second grooves 51 is 10-60 mm.

[0028] In order to reduce the material used in the geogrid, the bottom of the second groove 51 has a protrusion, the height of which is less than the depth of the second groove. The arrangement of the protrusion enables the prepared geogrid to have a first groove on at least one side of the transverse grid bar parallel to the plane where the mesh is located, thereby achieving the purpose of saving material.

[0029] In order to further increase the crosspiece thickness and the pulling force, the upper roller 4 is evenly provided with a third groove parallel to the center line of the upper roller 4 in the circumferential direction. The third groove has the same size as the second groove 51 , and the third groove and the second groove 51 are arranged correspondingly.

[0030] Furthermore, it also includes a punch for punching holes in unidirectionally stretched geogrid plates, the width of the punch is 5-30 mm, and the length of the punch is related to the spacing between adjacent second grooves 51. Specifically, the length of the punch is at least equal to the spacing between adjacent second grooves 51, or is 7-26 mm longer than the spacing between adjacent second grooves 51. At this time, the purpose of transversely stretching the geogrid by 1.5-3 times can be achieved.

[0031] The above method for manufacturing a geogrid for manufacturing a uniaxially stretched geogrid device is as follows:

[0032] The device for manufacturing uniaxially stretched geogrid is used to extrude a plate, and holes are punched by a punch. The punched plate is longitudinally stretched and rolled to obtain the uniaxially stretched geogrid.

[0033] It should be noted that the above steps may also include performing transverse stretching and rolling after longitudinal stretching to obtain a unidirectionally stretched geogrid with meshes of larger transverse dimensions.

Claims

1. A unidirectional tensile geogrid, comprising transverse grid bars (2) and longitudinal grid bars (3), wherein the transverse grid bars (2) and longitudinal grid bars (3) cross to form a plurality of regularly arranged rectangular meshes (1), characterized in that: The mesh (1) has a width of 20-50 mm and a length of 200-500 mm; the transverse grille bars (2) have a thickness of 3-20 mm; The transverse grid bar (2) has a first groove (21) on at least one side parallel to the plane where the mesh (1) is located; The thickness of the transverse grille bar (2) on both sides of the first groove (21) is 0.5-5 mm greater than the thickness of the transverse grille bar (2) in the middle of the first groove (21).

Images