CN212294607U - Bidirectional three-dimensional stretching geogrid - Google Patents

Abstract

The utility model relates to a two-way three-dimensional tensile geogrid, including floor and a plurality of node units of setting on the floor, every node unit is including seting up the tensile hole on the floor to and be located tensile hole periphery and with four nodes of floor integrated into one piece, each node loops through along circumference in the node unit and is connected with floor integrated into one piece's gusset, tensile hole is located in the region that each gusset encloses in the node unit. The utility model discloses an utilize integrated into one piece's gusset to connect two adjacent nodes, improved the tensile strength of grid, utilize gusset and node to evaginate in the part of floor, realized three-dimensional tensile to increased the snap-in force with the soil body, restricted the removal of the soil body better.

Description

Bidirectional three-dimensional stretching geogrid

Technical Field

The utility model relates to an infrastructure construction's geosynthetic material technical field especially involves the geogrid field, specifically indicates a biaxial stretching geogrid.

Background

The plastic geogrid is an important geosynthetic material, and is a planar net-shaped geogrid formed by plasticizing, extruding, punching and integrally stretching high-density polyethylene or polypropylene serving as a raw material, so that the stability of a reinforced soil body can be effectively enhanced, and the bearing capacity of a foundation is improved. Plays an important role in the projects of soft soil foundation reinforcement, reinforced retaining wall, side slope protection and the like.

The bidirectional plastic stretching geogrid is one of plastic grids, can bear force in two directions and has a grid structure. The bidirectional plastic stretching geogrid can enable the granular fillers and the grids to be mutually locked together to form a stable plane; the transmission load can be effectively dispersed, and the cracks of the road surface can be prevented; and can also prevent pavement subsidence and cracks caused by slurry turning. Therefore, the method is widely applied to reinforcement of permanent bearing foundations such as dams and road beds, side slope protection, tunnel wall reinforcement, large airports, parking lots, wharf cargo yards and the like.

However, the traditional two-way stretching geogrids are all plane structures, and the structures have poor anti-pulling performance and small engaging force and friction force with soil or internal fillers, so that the soil body is difficult to be well restrained and limited. Meanwhile, with the continuous progress of engineering technology, integral stretched plastic geogrids with high strength specifications are increasingly needed, and the existing processing method of the biaxial stretched geogrids cannot produce products with higher specifications.

To the not enough that prior art exists, this utility model's the main problem that biaxial stretching geogrid solved: the tensile strength of the grating is low, and the pulling resistance, the occlusion force and the friction force between the grating and the soil body are small.

Chinese patent publication No. CN 205712055U discloses a "double-layer stretched three-dimensional grid" in 2016, 11, 23, which provides a double-layer stretched three-dimensional grid, comprising double layers of longitudinal ribs and transverse ribs arranged in parallel and vertical grid-like manner, wherein the longitudinal ribs and the transverse ribs intersect to form nodes, and the corresponding nodes of the upper and lower layers are connected together by vertical columns. The double-layer three-dimensional grid is formed by performing unidirectional stretching or longitudinal and transverse bidirectional stretching on a polymer plate which is formed by injection molding or extrusion molding and is provided with a certain hole array.

The main problems of the patent products are complex structure, complex production process, low production efficiency and difficult processing.

Disclosure of Invention

The utility model discloses to prior art's not enough, provide a two-way three-dimensional tensile geogrid, simple structure, whole tensile strength is high, and the tensile performance of pulling out is good.

The utility model discloses a following technical scheme realizes, provides a two-way three-dimensional tensile geogrid, including floor and a plurality of node units of setting on the floor, every node unit is including seting up the tensile hole on the floor to and be located tensile hole periphery and with four nodes of floor integrated into one piece, each node loops through along circumference in the node unit and is connected with floor integrated into one piece's gusset, tensile hole is located in the region that each gusset encloses in the node unit.

The rib plates are arranged between the nodes, so that the tensile strength of the grating is improved, the part of the rib plates protruding out of the rib plates is utilized to improve the biting force with the soil body, the nodes, the rib plates and the rib plates are integrally formed, the production process is simple, and the production efficiency is favorably improved.

As optimization, each side of the stretching hole is parallel to each rib plate of the node unit where the stretching hole is located. Through the setting of this optimization scheme, more make things convenient for the biaxial stretching to the grid, distortion appears in the grid when avoiding tensile to product quality has been improved.

Preferably, the stretching holes are square, and the intersection positions of all sides of the stretching holes are in arc transition. This optimization scheme sets up tensile hole into the square, more makes things convenient for the structural arrangement to grid atress homogeneity has been improved, and tensile hole each side passes through the circular arc transition, has reduced stress concentration on the one hand, and on the other hand makes the floor retention volume around the node increase, has strengthened the reinforcing effect at the node, has further improved the tensile property of grid.

For optimization, both ends of the node in the thickness direction protrude out of the rib plates, and the rib plates are located in the middle of the node in the thickness direction. The nodes of the optimized scheme extend from the rib plates to two sides, so that the thickness of the nodes is further increased, and the nodes are not stretched, have lower strength than the stretched parts and are the weakest parts in the grating, so that the integral strength of the grating can be improved by thickening the nodes; the rib plates are arranged in the middle of the nodes, so that the nodes extend towards the two sides of the rib plates at equal intervals, the arrangement of production equipment is more convenient, the depth types of the grooves are reduced, and the interchangeability is stronger.

Preferably, the rib plates are arranged on two side surfaces of the rib plate. According to the optimized scheme, the rib plates are arranged on the two side faces of each rib plate, so that the tensile strength of the grating is further improved, the stress uniformity of the junction is improved, and the grating and the filler are better occluded and embedded.

Preferably, the rib plates are perpendicular to the rib plates, the side edges, far away from the rib plates, of the rib plates are arc-shaped, and the distance from the middle parts of the arc-shaped rib plates to the rib plates is smaller than the distance from the two ends of the arc-shaped rib plates to the rib plates. The rib plates are arranged to be perpendicular to the rib plates, so that the rib plates are convenient to integrally form, and the rib plates close to the nodes are large in height due to the arc arrangement of the rib plates, so that the tensile strength of the grating is improved, and the engaging force between the nodes and the soil body is increased.

And optimally, bosses protruding out of the nodes are arranged on the end faces of the nodes far away from the rib plates, and the bosses and the nodes are integrally formed. According to the optimized scheme, the lug boss is arranged, so that the friction force between the end part of the junction and the soil body is improved, and the limiting performance of the grating on the soil body is further improved.

The scheme also provides a manufacturing method of the bidirectional three-dimensional stretching geogrid, which comprises the following steps: the raw materials are pressed and molded through a groove calender roll after being melted and extruded to form a board with a plurality of node units, and each node unit comprises four convex nodes which are distributed in a rectangular shape, and transverse ribs and longitudinal ribs which are connected with adjacent nodes; and punching the inside of a quadrangle formed by the transverse ribs, the longitudinal ribs and the protruding nodes of each node unit to form a stretching hole.

Preferably, the groove calender roll comprises two roll bodies arranged up and down and a driving device for driving the two roll bodies to rotate, grooves are arranged on the outer arc surface of each roll body at equal intervals, and the cross section of each groove is arc-shaped or rectangular. The groove calender roll has the advantages that the groove calender roll is simple in structure, a part of materials enter the groove to form nodes and rib plates through extrusion of the two roll bodies, the thickness of the rib plates is reduced, punching is facilitated, and the process difficulty is greatly reduced.

The utility model has the advantages that: the two adjacent nodes are connected by the rib plates which are integrally formed, so that the tensile strength of the grating is improved, the rib plates and the nodes protrude outwards from the rib plates, the three-dimensional stretching is realized, the engaging force with the soil body is increased, and the movement of the soil body is better limited.

Drawings

Fig. 1 is a schematic structural view of the geogrid of the present invention;

fig. 2 is a side cross-sectional view of the geogrid of the present invention;

fig. 3 is a top cross-sectional view of the geogrid of the present invention;

fig. 4 is a process flow diagram of the bi-directional stereoscopic geogrid of the present invention;

FIG. 5 is a schematic diagram of a grooved calender roll configuration;

FIG. 6 is a side view of a grooved calender roll;

shown in the figure:

1. stretching holes, 2, nodes, 3, longitudinal ribs, 4, transverse ribs, 5, rib plates, 6 and bosses.

Detailed Description

In order to clearly illustrate the technical features of the present solution, the present solution is explained below by way of specific embodiments.

As shown in fig. 1, the bidirectional three-dimensional stretching geogrid comprises a rib plate 5 and a plurality of node units arranged on the rib plate, each node unit comprises a stretching hole 1 formed in the rib plate and four nodes 2 located on the periphery of the stretching hole and integrally formed with the rib plate, the four nodes in each node unit are distributed in a quadrilateral shape, each node in each node unit is sequentially connected with rib plates integrally formed with the rib plate along the circumferential direction, the stretching holes are located in areas surrounded by the rib plates in the node units, and each rib plate comprises a longitudinal rib 3 connected with nodes arranged longitudinally and a transverse rib 4 connected with nodes arranged transversely.

In the embodiment, the transverse ribs, the longitudinal ribs and the nodes in the same node unit form a square, the stretching holes are also square, the intersection positions of all sides of the stretching holes are in arc transition, and all sides of the stretching holes are parallel to all rib plates of the node unit where the stretching holes are located.

The horizontal both ends and the vertical both ends of node all are connected with the gusset, and the cross-sectional profile of node includes four straight sections and four interior concave arc sections of end to end in proper order, straight section and interior concave arc section interval distribution, and four straight sections and four interior concave arc sections all along circumference evenly distributed, and straight section is connected with the gusset, and interior concave arc section then reduces the stress of node department. The nodes extend towards two sides of the rib plate at equal intervals from two sides of the rib plate respectively, two ends of the node in the thickness direction protrude out of the rib plate, the rib plate is located in the middle of the node in the thickness direction, the rib plates are arranged on two side faces of the rib plate, and the two rib plates located on two sides of the rib plate between the two nodes are arranged oppositely. The end face of the node far away from the rib plate is provided with a boss 6 protruding out of the node, and the boss and the node are integrally formed so as to further increase the stability of the grid.

The rib plates are perpendicular to the rib plates, the side edges, far away from the rib plates, of the rib plates are arc-shaped, and the distance from the middle parts of the arc-shaped rib plates to the rib plates is smaller than the distance from the two ends of the arc-shaped rib plates to the rib plates.

In this embodiment geogrid, node department thickness is the biggest, and node and horizontal muscle, vertical muscle circular arc transitional coupling. Because the node department does not pass through tensile, and intensity is less than tensile part, is the weakest part in the grid, consequently thickening node can improve the bulk strength of grid, and horizontal muscle is indulged the muscle and can be designed into different width and thickness according to the operation requirement, both can the single face banding muscle also can two-sided banding muscle simultaneously, the two-sided banding muscle of this embodiment simultaneously. The thickness of the rib plate is realized by adjusting the distance between two grooved calender rolls according to the design requirements.

The manufacturing method of the bi-directional three-dimensional stretching geogrid comprises the following steps: automatic feeding, extruding by an extruder, molding by an extrusion die, molding by a groove calender, drawing and feeding by a tractor, punching by a punch, drawing by a longitudinal drawing machine, drawing by a transverse drawing machine, drawing by the tractor and winding. The manufacturing method is different from the prior art in that the raw materials are subjected to compression molding through a groove calender roll after being melted and extruded to form a plate with a plurality of node units, and each node unit comprises four convex nodes which are distributed in a rectangular shape, and transverse ribs and longitudinal ribs which are connected with adjacent nodes; and punching the inside of a quadrangle formed by the transverse ribs, the longitudinal ribs and the protruding nodes of each node unit to form a stretching hole. The groove calender roll comprises two roll bodies and a driving device, wherein the two roll bodies are arranged up and down, the driving device drives the two roll bodies to rotate, grooves are arranged on the outer arc surface of each roll body at equal intervals, the cross sections of the grooves are arc-shaped, rectangular or combined graphs, the cross sections of the grooves in the embodiment are the combined graphs of the arc-shaped and the rectangular, and therefore the nodes and the rib plates are formed at one time, and production efficiency is improved.

The thickness of the convex plate nodes, the transverse ribs and the longitudinal ribs is far greater than that of a conventional plate and is 3 times of that of the rib plate, and the thickness of the rib plate at the subsequent position needing to be punched is relatively small, so that the plate can be made into a product with higher strength. The final product after biaxial tension has a thickness far larger than that of a common biaxial grating and is better engaged and embedded with the filler, so that the drawing resistance, the engaging force and the friction force are large.

Of course, the above description is not limited to the above examples, and technical features of the present invention that are not described in the present application may be implemented by or using the prior art, and are not described herein again; the above embodiments and drawings are only used for illustrating the technical solutions of the present invention and are not intended to limit the present invention, and the present invention has been described in detail with reference to the preferred embodiments, and those skilled in the art should understand that changes, modifications, additions or substitutions made by those skilled in the art within the spirit of the present invention should also belong to the protection scope of the claims of the present invention.

Claims (7)

1. A biaxially oriented geogrid is characterized in that: the node unit comprises a rib plate (5) and a plurality of node units arranged on the rib plate, wherein each node unit comprises a stretching hole (1) formed in the rib plate and four nodes (2) located on the periphery of the stretching hole and integrally formed with the rib plate, each node in each node unit is sequentially connected with the rib plate integrally formed with the rib plate along the circumferential direction, and the stretching holes are located in an area surrounded by the rib plates in the node units.

2. The biaxially oriented geogrid according to claim 1, wherein: each side of the stretching hole is parallel to each rib plate of the node unit where the stretching hole is located.

3. The biaxially oriented geogrid according to claim 2, wherein: the stretching holes are square, and the intersection positions of all sides of the stretching holes are in arc transition.

4. The biaxially oriented geogrid according to claim 1, wherein: both ends of the node in the thickness direction protrude out of the rib plates, and the rib plates are located in the middle of the node in the thickness direction.

5. The biaxially oriented geogrid according to claim 4, wherein: the two side surfaces of the rib plate are provided with the rib plates.

6. The biaxially oriented geogrid according to claim 1, wherein: the rib plates are perpendicular to the rib plates, the side edges, far away from the rib plates, of the rib plates are arc-shaped, and the distance from the middle parts of the arc-shaped rib plates to the rib plates is smaller than the distance from the two ends of the arc-shaped rib plates to the rib plates.

7. The biaxially oriented geogrid according to claim 1, wherein: the end face of the node far away from the rib plate is provided with a boss (6) protruding out of the node, and the boss and the node are integrally formed.

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