CN110670571A

CN110670571A - Unidirectional stretching geogrid and manufacturing device thereof

Info

Publication number: CN110670571A
Application number: CN201911070647.0A
Authority: CN
Inventors: 杨宝和; 郑鸿; 金伟; 曹驾云; 袁绍鹏; 周可庆; 戴征杰; 王亚忠; 徐方军; 夏望; 陈泽明; 夏飞
Original assignee: QINGDAO BOSTD GEOSYNTHETICS Ltd
Current assignee: QINGDAO BOSTD GEOSYNTHETICS Ltd
Priority date: 2019-11-05
Filing date: 2019-11-05
Publication date: 2020-01-10

Abstract

The invention discloses a unidirectional stretching geogrid and a manufacturing device thereof, and belongs to the technical field of plastic geogrids. The unidirectional stretching geogrid comprises transverse grid bars and longitudinal grid bars, wherein the transverse grid bars and the longitudinal grid bars are intersected to form a plurality of regularly arranged rectangular meshes, the width of each mesh is 20-50mm, and the length of each mesh is 200-500 mm; the thickness of the transverse grid bars is 3-20 mm. The invention is applied to the field of soil body reinforcement of engineering construction, solves the problems of poor environment, small drawing force and poor reinforcement performance of the existing geogrid applied to large-particle-size soil body reinforcement, and provides a technical method of a geogrid product and a manufacturing device thereof, wherein the geogrid product is suitable for large-particle-size soil body reinforcement and has high drawing force resistance and excellent reinforcement performance.

Description

Unidirectional stretching geogrid and manufacturing device thereof

Technical Field

The invention belongs to the technical field of plastic geogrids, and particularly relates to a unidirectional stretching geogrid and a manufacturing device thereof.

Background

The plastic geogrid is mainly used in the field of soil body reinforcement of engineering construction, and along with the progress of engineering technology, high-specification integral stretching plastic geogrids are increasingly required. When the geogrid reinforced soil body structure is utilized, the friction characteristic between the geogrid and the surrounding soil body has important influence on the stability of the structure. The plastic stretching geogrid adopts high-density polyethylene or polypropylene as a raw material, and the plane net-shaped geogrid is formed by plasticizing, extruding, punching and integrally stretching, so that the stability of a reinforced soil body can be effectively enhanced, and the bearing capacity of a foundation is improved.

The unidirectional stretching geogrid has excellent reinforcement performance and durability, but when the existing unidirectional stretching geogrid interacts with a large-particle-size soil body, the movement deformation and micro deformation limiting effect is poor, and the friction performance is obviously reduced; the three-dimensional bidirectional geogrid and the three-dimensional bidirectional geogrid increase the engaging force between the land and the geogrid on the horizontal plane to a certain extent, however, the production process of the three-dimensional bidirectional geogrid and the three-dimensional bidirectional geogrid is complicated, the production efficiency is low, and the processing is difficult.

The unidirectional stretching geogrid or the three-dimensional bidirectional geogrid and the three-dimensional bidirectional geogrid have small inner hole diameter, and are used in large-particle-size soil body environments and poor in pulling and shearing resistance.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to solve the main problems that the existing geogrid cannot be used in a large-particle-size soil environment and the drawing force is small, and provides the unidirectional stretching geogrid which has large drawing force and can be used in the large-particle-size soil environment and the manufacturing device thereof.

In order to solve the technical problem, the technical scheme adopted by the invention is as follows:

the invention provides a one-way stretching geogrid, which comprises transverse grid bars and longitudinal grid bars, wherein the transverse grid bars and the longitudinal grid bars are intersected to form a plurality of regularly arranged rectangular meshes, the width of each mesh is 20-50mm, and the length of each mesh is 200-500 mm; the thickness of the transverse grid bars is 3-20 mm.

Preferably, the transverse grid bars have a first groove on at least one side parallel to the plane of the mesh.

Preferably, the thickness of the transverse grid bars on two sides of the first groove is 0.5-5mm greater than that of the transverse grid bars in the middle of the first groove.

The invention also provides a device for manufacturing the unidirectional tensile geogrid in any technical scheme, which comprises an upper roller, a middle roller and a lower roller which are sequentially arranged from top to bottom, wherein second grooves which are parallel to the central line of the middle roller are uniformly arranged in the circumferential direction of the middle roller.

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

Preferably, the bottom of the second groove is provided with a bulge, and the height of the bulge is smaller than the depth of the second groove.

Preferably, the upper roll is circumferentially and uniformly provided with third grooves parallel to the central line of the upper roll, the third grooves have the same size as the second grooves, and the third grooves correspond to the second grooves.

Compared with the prior art, the invention has the beneficial effects that:

1. compared with the unidirectional grille with the common aperture, the unidirectional grille with the large aperture and the filler with larger particles have better occlusion and embedding effects and higher interaction coefficients, and can reduce the strength and the use number of the geogrid product on the premise of ensuring the stability of a retaining wall side slope, thereby obviously reducing the construction cost and having good economic benefit; local materials can be obtained by adopting the large-aperture grid, so that the damage of external transportation filling to the environment is avoided, and good social benefits are achieved; the unidirectional stretching geogrid is transversely stretched at low magnification, so that molecules are oriented on transverse ribs, and the geogrid transversely achieves higher strength;

2. on the other hand, the invention provides a device for manufacturing the unidirectional stretching geogrid in any technical scheme, so that the production of the integral stretching plastic geogrid is realized, the production process is stable and mature, the production efficiency is high, and the production cost is effectively saved on the premise of ensuring high strength of the large-aperture geogrid.

Drawings

Fig. 1 is a schematic view of a unidirectional tensile geogrid structure provided by an embodiment of the present invention, wherein a is a front view and b is a top view;

FIG. 2 is a schematic structural diagram of an apparatus according to an embodiment of the present invention;

in the above figures: 1. mesh openings; 2. a transverse grid bar; 21. a first groove; 3. longitudinal grid bars; 4. upper roll; 5. a middle roller; 51. a second groove; 6. and a lower roller.

Detailed Description

The invention is described in detail below by way of exemplary embodiments. It should be understood, however, that elements, structures and features of one embodiment may be beneficially incorporated in other embodiments without further recitation.

In the description of the present invention, it is to be understood that the terms "upper", "lower", and the like, indicate orientations or positional relationships based on those shown in fig. 1, are only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

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

Example (b): as shown in figure 1, the invention provides a unidirectional stretching geogrid, which comprises transverse grid bars 2 and longitudinal grid bars 3, wherein the transverse grid bars 2 and the longitudinal grid bars 3 are crossed to enclose a plurality of regularly arranged rectangular meshes 1, the width of the meshes 1 is 20-50mm, and the length of the meshes 1 is 200-500 mm; the thickness of the transverse grid bars 2 is 3-20 mm. In the embodiment, the thickness of the transverse grid strips 2 is 1.5-3 times that of the existing geogrid, so that the engagement force of the geogrid is greatly improved. In addition, because the size of the unidirectional tensile geogrid provided by the embodiment is larger, compared with the unidirectional geogrid with the common aperture, the large-aperture geogrid and the filler with larger particles have better occlusion and embedding effects and higher interaction coefficients, and the using amount of geogrid products can be reduced on the premise of ensuring the stability of the retaining wall side slope, so that the construction cost is obviously reduced, and the unidirectional tensile geogrid has good economic benefits; in many reinforced slope projects, when the unidirectional grating with the common aperture is adopted, the broken stone with larger particle size which is mined on site does not meet the requirement of the reinforced slope filler, the filler with large particle size needs to be crushed, the crushing quantity is large, time and labor are wasted, the engineering cost is additionally increased, or the filling meeting the engineering requirement is transported outside, the excavated filling causes damage to the surrounding environment, the large aperture grating can realize local material utilization, the damage of the filling transported outside to the environment is avoided, and the good social benefit is achieved. It should be noted that the unidirectional tensile geogrid is transversely stretched at a low rate to enable molecules to be oriented on the transverse ribs, so that the unidirectional tensile geogrid transversely achieves higher strength.

In order to save materials while ensuring the grip of the geogrid, the transverse grid bars 2 have a first groove 21 on at least one side parallel to the plane of the mesh openings 1.

In order to ensure that the crosspiece has sufficient strength to engage the soil mass, the thickness of the transverse grid bars 2 on both sides of the first groove 21 is 0.5-5mm greater than the thickness of the transverse grid bars 2 in the middle of the first groove 21.

The invention provides a device for manufacturing the unidirectional tensile geogrid of the embodiment, which comprises an upper roller 4, a middle roller 5 and a lower roller 6 which are sequentially arranged from top to bottom, wherein the middle roller 5 is uniformly provided with second grooves 51 which are parallel to the central line of the middle roller 5 in the circumferential direction. The device provided by the embodiment realizes the manufacture of the integral unidirectional stretching geogrid, and simultaneously increases the thickness of the geogrid to a certain extent and improves the biting force of the geogrid by arranging the second groove 51 on the middle roller 5. In addition, the device realizes the production of the integral stretching plastic geogrid, has stable and mature production process and high production efficiency, and effectively saves the production cost of the large-aperture grille on the premise of ensuring high strength.

In order to ensure the gripping force of the manufactured geogrid, the width of the second grooves 51 is 5-30mm, the depth is 1-10mm, and the distance between every two adjacent second grooves 51 is 10-60 mm.

In order to reduce the material used for the geogrid, the bottom of the second groove 51 is provided with a protrusion, and the height of the protrusion is smaller than the depth of the second groove. The arrangement of the bulges enables the prepared geogrid to be provided with the first groove on at least one side of the plane where the transverse grid strips are parallel to the meshes, so that the purpose of saving materials is achieved.

In order to further improve the thickness of the crosspiece and improve the drawing force, the upper roller 4 is uniformly provided with third grooves parallel to the central line of the upper roller 4 in the circumferential direction, the third grooves are the same as the second grooves 51 in size, and the third grooves are arranged corresponding to the second grooves 51.

Further, the device also comprises a punch for punching the unidirectionally stretched geogrid sheet, wherein the width of the punch is 5-30mm, the length of the punch is related to the distance between the adjacent second grooves 51, specifically, the length of the punch is at least equal to the distance between the adjacent second grooves 51 or is 7-26mm longer than the distance between the adjacent second grooves 51, and the aim of stretching the geogrid transversely by 1.5-3 times can be fulfilled.

The method for manufacturing the geogrid by using the device for manufacturing the unidirectional tension geogrid comprises the following steps:

the device for manufacturing the unidirectional stretching geogrid is adopted to extrude the plate, the punch is utilized to punch, the punched plate is longitudinally stretched and rolled, and the unidirectional stretching geogrid is obtained.

It should be noted that the above steps may further include performing transverse stretching and rolling after performing longitudinal stretching to obtain the unidirectional stretching geogrid with larger transverse mesh openings.

Claims

1. The unidirectional stretching geogrid comprises transverse grid bars (2) and longitudinal grid bars (3), wherein the transverse grid bars (2) and the longitudinal grid bars (3) are intersected to form a plurality of regularly arranged rectangular meshes (1), and the unidirectional stretching geogrid is characterized in that the width of the meshes (1) is 20-50mm, and the length of the meshes (1) is 200-500 mm; the thickness of the transverse grid bars (2) is 3-20 mm.

2. An uniaxially stretched geogrid according to claim 1, characterized in that the transverse grid strips (2) have first grooves (21) on at least one side parallel to the plane of the mesh openings (1).

3. An uniaxially stretched geogrid according to claim 2, characterized in that the thickness of the transverse grid bars (2) on both sides of the first groove (21) is 0.5-5mm greater than the thickness of the transverse grid bars (2) in the middle of the first groove (21).

4. The device for manufacturing the unidirectional tension geogrid as claimed in claim 1 is characterized by comprising an upper roller (4), a middle roller (5) and a lower roller (6) which are sequentially arranged from top to bottom, wherein second grooves (51) which are parallel to the central line of the middle roller (5) are uniformly arranged in the circumferential direction of the middle roller (5).

5. The device according to claim 4, wherein the second grooves (51) have a width of 5-30mm and a depth of 1-10mm, and the distance between adjacent second grooves (51) is 10-60 mm.

6. Device according to claim 5, characterized in that the bottom of the second groove (51) has a projection, the height of which is smaller than the depth of the second groove.

7. A device according to claim 4, characterized in that the upper roll (4) is circumferentially and uniformly provided with third grooves arranged in parallel with the central line of the upper roll (4), the third grooves have the same size as the second grooves (51), and the third grooves are arranged corresponding to the second grooves (51).