A welded plastic geocell and its manufacturing method

Abstract

The present invention relates to a welded plastic geocell and a manufacturing method thereof, comprising a plurality of cell sheet bodies, wherein the cell sheet bodies comprise a plurality of sheets and a plurality of transverse ribs connected in an interlaced manner, wherein the transverse ribs on adjacent cell sheet bodies are welded and connected at intervals to form connection nodes, and wherein the transverse ribs are characterized in that the length of the transverse ribs is greater than or equal to the width of the sheet, the thickness of the transverse ribs is greater than the thickness of the sheet, the sheet comprises a multilayer orientation beam layer arranged along its thickness direction, the orientation beam layer comprises a plurality of high molecular polymer orientation beams, at least one high molecular polymer orientation beam in the orientation beam layer is stretched and oriented along the length direction of the sheet, and the setting of the isolation strip separates two adjacent cell sheet bodies at the cell connection node at a fixed angle, thereby improving the laying efficiency of the plastic geocell, and being able to conveniently adjust the opening angle of the geocell grid according to the cell side length, so as to achieve the best opening effect of the geocell grid.

Description

Technical Field

[0001] The invention relates to the technical field of geocells, in particular to a welded plastic geocell and a manufacturing method thereof. Background Art

[0002] Geocell is a geotechnical reinforcement material with a honeycomb structure formed by strong connections of high-strength ribs. It is flexible and can be folded up during transportation. It can be opened and filled with soil, concrete or other fillers during use to form a structure with strong lateral restraint and rigidity. It can be used as a cushion to increase the bearing capacity of soft foundations, or it can be laid on slopes to form slope protection structures, and it can also be used to build retaining structures, etc.

[0003] With the widespread application of geocells in the field of reinforcement, the adequacy of the grid expansion of plastic geocells is particularly important. The traditional node connection methods of geocells, such as welding, plug-in, riveting, mortise and tenon connection, bolt connection or injection molding connection, etc., have defects such as difficulty in laying the grid at the construction site, uneven grid size after the grid is expanded, and dead corners in the backfill. Therefore, presetting the opening angle of the cell sheet in the production process of plastic geocells can solve the shortcomings in the construction and use of plastic geocells. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a welded plastic geocell and a manufacturing method thereof.

[0005] The present invention is achieved through the following technical scheme, which provides a welded plastic geocell, including a plurality of cell sheet bodies, wherein the cell sheet bodies include a plurality of sheets and a plurality of transverse ribs connected in an interlaced manner, and the transverse ribs on adjacent cell sheet bodies are welded and connected at intervals to form connection nodes, wherein the length of the transverse ribs is greater than or equal to the width of the sheet, and the thickness of the transverse ribs is greater than the thickness of the sheet, and the sheet includes a multilayer orientation beam layer arranged along its thickness direction, wherein the orientation beam layer includes a plurality of high molecular polymer orientation beams, and at least one high molecular polymer orientation beam in the orientation beam layer is stretched and oriented along the length direction of the sheet.

[0006] In the present scheme, the oriented beam layer includes a plurality of oriented polymer beams, which are formed by stretching the sheet raw material as a whole to form a plurality of oriented polymer beams, and are interconnected by multiple oriented beam layers to form a cell sheet. Since the cell sheet contains a plurality of oriented polymer beams stretched and oriented along its length direction, the tensile strength of the cell sheet in the length direction is greatly enhanced, and because of the orientation of the polymer, the elongation of the cell sheet in the length direction is greatly reduced, so that the plastic geocell has a greater ability to prevent lateral limitation and limit engineering deformation.

[0007] In the sheet of this solution, there is also an embodiment where the included angle between the stretching orientation direction of the polymer orientation bundle and the length direction of the sheet is an acute angle or a right angle, so as to improve the folding resistance in the width direction of the sheet, thereby improving the compressive capacity of the plastic geocell.

[0008] As an optimization, the number of layers of the orientation bundle layer gradually increases from the center of the width of the sheet along its two width edges. In this solution, the number of layers of the orientation bundle layer at the width edge position of the sheet is more, so that the thickness of the sheet edge increases, thereby improving the tensile and compressive capacities at the sheet edge position.

[0009] As an optimization, at least one of the upper and lower width edges of the sheet is set as a curved edge, and the width of the sheet gradually becomes narrower along the direction away from the transverse rib at its end. In this solution, the curved edge of the sheet width is formed by longitudinal stretching of the sheet-like raw material. The width of the sheet is wide near the transverse rib and narrow away from the transverse rib, and at least one of the joints between the sheet and the transverse rib is a curved connection. On the one hand, it can eliminate the stress concentration at this joint and improve the service life of the plastic geocell; on the other hand, due to the inconsistent width of the sheet, a drainage channel is formed between the sheet and the filler above and / or below it, which can timely drain the moisture in the filler and achieve the purpose of quickly consolidating the filler.

[0010] As an optimization, multiple layers of orientation bundle layers are arranged along the thickness direction of the transverse rib. The orientation bundle layer includes multiple polymer orientation bundles, and at least one polymer orientation bundle in the orientation bundle layer is stretched and oriented along the length direction of the sheet. In this solution, the polymer orientation bundle stretched and oriented along the length direction of the sheet is also arranged in the transverse rib, which can greatly improve the mechanical properties of the connection nodes of the plastic geocell.

[0011] As an optimization, a plurality of grooves and / or protrusions are arranged on the outer side of the transverse rib. In this solution, the grooves and / or protrusions are arranged on the outer side of the transverse rib, which can increase the friction between the transverse rib and the connection nodes of the geocell and the filler; in other solutions, the mechanical properties of the connection nodes of the plastic geocell are improved by bending the transverse rib.

[0012] As an optimization, the polymer orientation bundles are respectively stretched and oriented along the length direction and the width direction of the sheet. The stretching and orientation of the polymer orientation bundles along the length and width directions of the sheet can improve the tensile force in the length direction of the sheet and the tear resistance in the width direction, and improve the anti-lateral confinement and right-angle tear resistance of the plastic geocell.

[0013] As an optimization, the sheet is provided with N through holes, the planar projection pattern of the through holes is oval or fusiform, the long axis of the through holes is parallel to the length direction of the sheet, and the length of the long axis of the through holes is less than or equal to the length of the sheet. The N through holes divide the sheet into N + 1 small pieces along its width direction. The width of the small pieces gradually becomes wider from the narrowest part in the middle thereof along the direction close to the transverse ribs at both ends thereof. The number N of the through holes is a natural number.

[0014] In this solution, the sheet is provided with N through holes with an oval or fusiform planar projection pattern. The through holes divide the sheet into N + 1 small pieces along its width direction. Both ends of any small piece are fixed by transverse ribs. The arrangement of the through holes can evenly distribute the filler in adjacent grids of the plastic geocell, and the more the number of through holes, the faster the filler is evenly distributed; the arrangement of the through holes can drain the moisture of the filler in the grid of the geocell and quickly solidify the filler, and the more the number of through holes, the faster the filler is solidified; the arrangement of the through holes can greatly increase the biting force between the geocell sheet and the filler, and the more the number of through holes, the greater the biting force between the sheet and the filler. The width of the sheet or the small pieces gradually becomes wider from the narrowest part in the middle thereof along the direction close to the transverse ribs at both ends thereof, ensuring the maximum tensile force in the length direction of the plastic geocell sheet and achieving the purpose of reducing the gram weight per unit area of the plastic geocell.

[0015] As an optimization, a plurality of blind holes are provided on the sheet. The arrangement of the blind holes in this solution can improve the biting ability between the sheet and the soil, and at the same time can also reduce the gram weight of the geocell.

[0016] As an optimization, it further includes a connecting member arranged in the connection node. The connecting member is a hot-melt plastic column, a rivet, a bolt, a U-shaped nail or any combination of the above connection structures. The arrangement of the connecting member in this solution improves the mechanical properties of the connection node formed after the transverse ribs are welded.

[0017] As an optimization, a separation strip is fixedly connected to the connection node and is located between the sheets of adjacent geocell sheet bodies. At least one end of the separation strip is connected to the connection node, and the separation strip extends along the width direction of the sheet. The separation strip in this solution separates two adjacent sheets at the connection node, enabling them to naturally maintain a certain included angle, improving the laying efficiency of the plastic geocell and preventing filling dead corners from occurring during the filling process of the filler.

[0018] As an optimization, an adjusting plate extends outward from the upper end of the connection node, and a plurality of adjusting holes for inserting the end of the separation strip are formed on the adjusting plate. In this solution, by inserting the separation strip into different adjusting holes, the adjustment of the included angle between adjacent sheets can be realized.

[0019] As an optimization, positioning hooks are fixedly connected to both sides of the isolation strip. The positioning hooks are located between the adjusting plate and the sheet material, and the edges of adjacent sheet materials are respectively inserted into the two positioning hooks. The positioning hooks in this solution are hung on the edge of the sheet material, thereby positioning the sheet material and maintaining the unfolded state of the plastic geogrid.

[0020] As an optimization, the connection node is composed of two mutually welded transverse ribs and a welding layer. The two mutually welded transverse ribs are respectively welded on the front and back sides of the welding layer.

[0021] As an optimization, the isolation strip is the overflow material of a part of the molten raw material of two mutually welded transverse ribs under the extrusion of external force. In this solution, the isolation strip and the connection node of the plastic geogrid are of the same integral structure, and the connection strength between the isolation strip and the connection node of the plastic geogrid is high, further improving the installation efficiency of the isolation strip of the plastic geogrid and reducing the production cost of the plastic geogrid.

[0022] A manufacturing method of a welded plastic geogrid includes the following steps:

[0023] a. The polymer and its processing aids form a plastic melt in a plastic molten state through mixing, feeding, the extrusion system of an extruder, and a coat hanger die head. The temperature of the extrusion system of the extruder and the coat hanger die head is controlled at 130°C - 320°C;

[0024] b. The plastic melt in a molten state is cooled and shaped by a three-roll calender with a roller provided with grooves. At least two of the rollers of the three-roll calender are relatively arranged grooved rollers, the depth of the grooved rollers is not less than 1 mm, and the temperature of the rollers of the three-roll calender is controlled at 20°C - 95°C;

[0025] c. The plastic tape after being cooled by the three-roll calender is cut into plastic strips with a width greater than 40 mm;

[0026] d. The plastic strip enters a stretching device for longitudinal stretching to obtain a geogrid sheet body. The part extruded by the relatively arranged grooved rollers is stretched to form transverse ribs, and the longitudinal stretching temperature is 80°C - 350°C;

[0027] e. The transverse ribs on adjacent geogrid strips are welded and connected at intervals through an automatic welding machine to form a plastic geogrid;

[0028] f. Adjusting plates are hot melt welded on both sides of the connection node, the upper end of the isolation strip is inserted into the adjusting hole of the adjusting plate, and the edges of the sheet material are respectively inserted into the positioning hooks.

[0029] As an optimization, the high molecular polymer is PP, HDPE or PET, the processing aids include antioxidants, ultraviolet absorbers and carbon black, the addition amount of the antioxidant is 0.02% of the mass of the high molecular polymer, the addition amount of the ultraviolet absorber is 0.01% of the mass parts of the high molecular polymer, and the addition amount of the carbon black is 2.1% of the mass parts of the high molecular polymer.

[0030] The beneficial effects of the present invention are as follows:

[0031] 1. The setting of the isolation strip separates two adjacent cell sheets at the connection node of the plastic geocell at a fixed angle, improving the laying efficiency of the plastic geocell at the construction site.

[0032] 2. The end of the connection node of the plastic geocell is provided with an adjustment hole, and the isolation strip is provided with a positioning groove for the cell sheet body, which can conveniently adjust the opening angle of the geocell grid according to the side length of the cell, so that the grid of the geocell has the best unfolding effect.

[0033] 3. The setting of the isolation strip can make the grid size of the unfolded plastic geocell uniform, evenly distribute the load of the plastic geocell, improve the service life of the plastic geocell, and avoid the backfill dead angle of the filler. Description of the Drawings

[0034] Figure 1 is a schematic structural diagram of the present invention;

[0035] Figure 2 is a partial enlarged view at the position of the transverse rib of the present invention;

[0036] Figure 3 is a side view at the position of the transverse rib of the present invention;

[0037] Figure 4 is a front view at the position of the transverse rib of the present invention;

[0038] Figure 5 is a schematic diagram of the isolation strip of the present invention;

[0039] Figure 6 is a front view of the sheet of the present invention;

[0040] Figure 7 is a front view of another structure of the sheet of the present invention;

[0041] Figure 8 is a front view of another structure of the sheet of the present invention;

[0042] Figure 9 is a front view of another structure of the sheet of the present invention;

[0043] Figure 10 is a front view of the through hole on the sheet of the present invention;

[0044] As shown in the figure:

[0045] 1. Sheet, 2. Transverse ribs, 3. High molecular polymer oriented bundle, 4. Blind hole, 5. Through hole, 6. Protrusion, 7. Connector, 8. Isolation strip, 9. Adjustment plate, 10. Positioning hook, 11. Adjustment hole. DETAILED DESCRIPTION

[0046] In order to clearly illustrate the technical features of this solution, this solution is described below through a specific implementation method.

[0047] Example 1

[0048] like Figures 1 - 10 As shown, a welded plastic geocell of the present invention comprises a plurality of cell sheet bodies, wherein the cell sheet body comprises a plurality of sheets 1 and a plurality of transverse ribs 2 which are staggered and connected, wherein the plurality of sheets 1 are connected head to tail by the transverse ribs 2, so that the transverse ribs 2 are fixed at both ends of the sheet 1, and the transverse ribs 2 are made of the same material as the sheet 1 (in other embodiments, the transverse ribs 2 and the sheet 1 are made of different materials) and are integrally formed, and the transverse ribs 2 are evenly distributed on the sheet body.

[0049] like Figure 1 As shown, the transverse ribs 2 on adjacent cell sheets are welded and connected at intervals to form connection nodes, thereby forming a mesh structure, which is opened and filled with soil, stone, concrete or other fillers when in use, forming a structure with strong lateral restraint force and rigidity.

[0050] The thickness of the transverse ribs 2 is greater than the thickness of the sheet 1 , and the thickness of the transverse ribs 2 protrudes from both sides of the sheet 1 .

[0051] The length direction of the transverse rib 2 is consistent with the width direction of the sheet 1. The width direction of the transverse rib 2 is consistent with the length direction of the sheet 1. In this embodiment, the length of the transverse rib 2 extends vertically, and the length of the transverse rib 2 is greater than or equal to the width of the sheet 1. Figure 6 -9, the length of the transverse rib 2 is greater than the width of the sheet 1.

[0052] At least one of the upper and lower width edges of the sheet 1 is configured as a curved edge, and the width of the sheet 1 gradually narrows in a direction away from the transverse rib 2 at its end. Figure 6 The upper and lower edges of the middle sheet 1 are straight lines, for example Figure 7 The lower edge of the middle sheet 1 is a straight line, and the upper edge is a curve. Figure 8 The upper and lower edges of the middle sheet 1 are all curved. Figure 8 The upper and lower edges of the middle sheet 1 are both structures with curves at both ends and a straight line in the middle.

[0053] The sheet 1 includes multiple layers of oriented bundle layers arranged along its thickness direction. That is to say, the sheet 1 is formed by longitudinally stretching a sheet-shaped raw material under heated conditions. The number of layers of the oriented bundle layers gradually increases from the width center of the sheet 1 towards its two width edges, thereby improving the tensile capacity at the edge positions.

[0054] The oriented bundle layer includes multiple polymer oriented bundles 3. In this embodiment, the sheet 1 is formed by longitudinally stretching a sheet-shaped raw material under heated conditions, and it contains multiple polymer oriented bundles 3 oriented along the length direction of the sheet 1. Generally, the sheet-shaped raw material is a crystalline polymer. When the crystalline polymer extends from the thickness center of the sheet-shaped raw material towards both thickness edges, the crystallinity of the sheet-shaped raw material at different thickness positions is different. When the sheet-shaped raw material with different crystallinities is stretched by the same external force, its stretching orientation degree is different; furthermore, the temperature rise speed of different thickness positions of the sheet-shaped raw material after absorbing heat within the same time is different, and its stretching orientation degree is also different under the action of the same external force. The sheet-shaped raw material forms interconnected multiple layers of oriented bundle layers through longitudinal stretching under heated conditions. Each layer of the oriented bundle layer is provided with multiple polymer oriented bundles 3 oriented along the length direction of the sheet 1, and the sheet 1 is formed by connecting the multiple layers of oriented bundle layers. At the same time, the upper and lower width edges of the sheet 1 are longitudinally stretched to form two curved edges, and the width of the sheet 1 gradually becomes narrower along the direction away from the two transverse ribs 2 at its two ends, converging at the narrowest part in the middle of the sheet 1. Since the sheet-shaped raw material is longitudinally stretched by an external force in a heated state, the sheet-shaped raw material is stretched and elongated along its length direction, and at the same time, its width direction shrinks and becomes narrower along a curve. The number of layers of the polymer oriented layer gradually accumulates and increases from the width center of the sheet 1 towards its two width edges, making the thickness of the sheet 1 gradually become thicker from its width center towards its width edges.

[0055] In other embodiments of this embodiment, by using a grid-shaped or strip-shaped stretched plastic grille or stretched plastic strip, multiple long polymer oriented bundles 3 are formed during the stretching process. The stretched plastic grille or stretched plastic strip is compounded with the polymer in a molten state to form a cellular sheet body, and the cellular sheet body includes multiple interconnected and uniformly arranged sheets 1 and multiple transverse ribs 2.

[0056] Since the direction of the polymer oriented bundle formed by stretching depends to a certain extent on the structure of the raw material. For example, the polymer oriented bundle formed by stretching a net-shaped raw material shows a cross structure. In other embodiments of this embodiment, at least one polymer oriented bundle 3 in the oriented bundle layer is stretched and oriented along the length direction of the sheet 1. That is, at least one polymer oriented bundle 3 is parallel to the length direction of the sheet 1.

[0057] The multi-layer orientation bundle layer of the transverse rib 2 is arranged along its thickness direction. The orientation bundle layer includes a plurality of polymer orientation bundles 3, and at least one polymer orientation bundle 3 in the orientation bundle layer is stretched and oriented along the length direction of the sheet 1. In this embodiment, the transverse rib 2 is also provided with a polymer orientation bundle 3 that is stretched and oriented along the length direction of the sheet 1, which can greatly improve the mechanical properties of the connection nodes of the plastic geocell.

[0058] As Figure 10 shown, the sheet 1 is provided with N through holes 5. The planar projection pattern of the through holes 5 is elliptical or fusiform. The long axes of the through holes 5 are all parallel to the length direction of the sheet 1, and the length of the long axis of the through holes 5 is less than or equal to the length of the sheet 1. The N through holes 5 divide the sheet 1 into N + 1 small pieces along its width direction. The width of the small pieces gradually becomes wider from the narrowest part in the middle along the direction close to the transverse ribs at both ends. The number N of the through holes 5 is a natural number. In this embodiment, there are 2 through holes 5. The planar projection patterns of the 2 through holes 5 are both elliptical. The long axes of the elliptical through holes 5 are all parallel to the length direction of the sheet 1, and the lengths of the long axes of the through holes 5 are all less than the length of the sheet 1. The 2 through holes 5 divide the sheet 1 into 3 small pieces along its width direction (the 3 small pieces form 1 sheet 1). The width of the sheet 1 or the small pieces gradually becomes wider from the narrowest part in the middle along the direction close to the transverse ribs at both ends. As Figure 10 shown, in other embodiments, the planar projection patterns of the 2 through holes 5 are fusiform or a combination of one being fusiform and the other being elliptical; in other embodiments, the length of the long axis of the through holes 5 is equal to the length of the sheet 1; in other embodiments, the number N of the through holes 5 is a natural number other than 2.

[0059] A plurality of grooves and / or protrusions 6 are arranged outside the transverse rib 2. In this embodiment, a plurality of grooves and / or protrusions 6 are arranged outside the transverse rib 2, which can increase the friction between the transverse rib 2 and the connection nodes of the geocell and the filler; in other embodiments, the mechanical properties of the connection nodes of the plastic geocell are improved by bending the transverse rib 2.

[0060] The polymer orientation bundles 3 are respectively arranged with stretching orientations along the length direction and the width direction of the sheet 1. The stretching orientations of the polymer orientation bundles 3 along the length and width directions of the sheet 1 can improve the tensile strength in the length direction of the sheet 1 and the tear resistance in the width direction, and improve the anti-lateral confinement and right-angle tear resistance of the plastic geocell.

[0061] A plurality of blind holes 4 are arranged on the sheet 1. The blind holes 4 are linear, elliptical, rectangular, square, polygonal, circular, fusiform or racetrack-shaped and any combination of the above shapes. Arranging the blind holes 4 can improve the friction between the sheet 1 and the filler and reduce the gram weight of the plastic geocell.

[0062] A plurality of protrusions 6 are provided on the sheet 1. The protrusions 6 are small particle protrusions. The protrusions 6 are on the sheet 1. The protrusions 5 can be provided in one or more places. The setting of the protrusions 6 can increase the frictional force and biting force between the sheet 1 and the filler.

[0063] It also includes a connecting member 7 provided in the connection node. The connecting member 7 is a hot-melt plastic column, a rivet, a bolt, a U-shaped nail or any combination of the above connection structures. The setting of the connecting member 7 in the connection node can effectively improve the mechanical properties at the connection node of the plastic geocell.

[0064] An isolation strip 8 is fixedly connected to the connection node between the sheets 1 of adjacent cell sheet bodies. At least one end of the isolation strip 8 is connected to the connection node. The isolation strip 8 extends along the width direction of the sheet 1. In this embodiment, an isolation strip 8 is connected to each of the upper ends of the connection node along the length direction of the sheet 1. The isolation strip 8 is a plastic cylinder, so as to separate the two adjacent cell sheets 1 at the connection node. When the size and shape of the isolation strip 8 are certain, the closer the isolation strip 8 is to the connection node, the larger the included angle between the separated adjacent sheets 1.

[0065] Specifically, an adjusting plate 9 extends outward from the upper end of the connection node. A plurality of adjusting holes 11 for inserting the end portions of the isolation strip 8 are formed in the adjusting plate 9. By inserting the upper end of the isolation strip 8 into different adjusting holes 11, the adjacent sheets 1 can be kept at different unfolding included angles.

[0066] Positioning hooks 10 are fixedly connected to both sides of the isolation strip 8. The positioning hooks 10 open downward. The positioning hooks 10 are located between the adjusting plate 9 and the sheet 1. The edges of the adjacent sheets 1 are respectively inserted into the two positioning hooks 10, thereby limiting the position of the sheet 1 and preventing the isolation strip 8 from slipping out downward at the same time.

[0067] A manufacturing method of a welded plastic geocell includes the following steps:

[0068] a. The polymer and its processing aids are mixed, fed, passed through an extrusion system of an extruder and a coat hanger die head to form a plastic melt in a plastic molten state. The temperature of the extrusion system of the extruder and the coat hanger die head is controlled at 130°C - 320°C;

[0069] b. The plastic melt in a molten state is cooled and shaped by a three-roll calender with a roller provided with grooves. Multiple plastic melts can be cooled and shaped side by side. Among them, at least two of the rollers of the three-roll calender are relatively arranged grooved rollers. The depth of the grooved rollers is not less than 1 mm. The grooved rollers are independently driven by a servo system and are equipped with a grooved roller position synchronization controller. The temperature of the rollers of the three-roll calender is controlled at 20°C - 95°C;

[0070] c. Cut the plastic tape after being cooled by the three-roll calender into plastic strips with a width greater than 40 mm;

[0071] d. The plastic strips enter the stretching device for longitudinal stretching to obtain a cellular sheet body. The part stretched out by the relatively arranged grooved rollers forms the transverse rib 2. The longitudinal stretching temperature is 80°C - 350°C;

[0072] e. The transverse ribs 2 on adjacent cellular strips are welded and connected at intervals through an automatic welding machine to form a plastic geocell;

[0073] f. Heat-melt and weld the adjusting plates 9 on both sides of the connection node, insert the upper end of the isolation strip 8 into the adjusting hole 11 of the adjusting plate 9, and insert the edges of the sheet 1 into the positioning hooks 10 respectively.

[0074] The high molecular polymer is PP, HDPE or PET. The processing aids include antioxidant, ultraviolet absorber and carbon black. The addition amount of the antioxidant is 0.02% of the mass of the high molecular polymer, the addition amount of the ultraviolet absorber is 0.01% of the mass part of the high molecular polymer, and the addition amount of the carbon black is 2.1% of the mass part of the high molecular polymer.

[0075] Example 2:

[0076] In this example, the isolation strip 8 is formed by a part of the molten raw material of two mutually welded transverse ribs 2 being extruded out by external force. In this solution, the isolation strip 8 and the connection node of the plastic geocell are of the same integral structure. The connection strength between the isolation strip 8 and the cellular connection node is high, which further improves the installation efficiency of the isolation strip of the plastic geocell and reduces the production and manufacturing cost of the plastic geocell.

[0077] Of course, the above description is not limited to the above examples. The technical features not described in the present invention can be realized by or adopt the prior art, and will not be elaborated here; the above embodiments and drawings are only used to illustrate the technical solution of the present invention and are not a limitation to the present invention. The present invention has been described in detail with reference to the preferred embodiments. Those of ordinary skill in the art should understand that any changes, modifications, additions or substitutions made by those of ordinary skill in the art within the scope of the essence of the present invention do not depart from the purpose of the present invention and should also fall within the scope of the protection of the claims of the present invention.

Claims

1. A welded plastic geocell, comprising a plurality of geocell sheet bodies, the geocell sheet bodies comprising a plurality of sheets (1) and a plurality of transverse ribs (2) that are cross-connected, and the transverse ribs (2) on adjacent geocell sheet bodies are welded together at intervals to form connection nodes, characterized in that: The length of the transverse rib (2) is greater than or equal to the width of the sheet (1), the thickness of the transverse rib (2) is greater than the thickness of the sheet (1), the sheet (1) includes multiple layers of oriented bundle layers arranged along its thickness direction, the oriented bundle layer includes multiple polymer polymer oriented bundles (3), and at least one polymer polymer oriented bundle (3) in the oriented bundle layer is stretched and oriented along the length direction of the sheet (1); An isolation strip (8) located between the sheets (1) of adjacent cell sheet bodies is fixedly connected to the connection node, at least one end of the isolation strip (8) is connected to the connection node, and the isolation strip (8) extends along the width direction of the sheet (1); An adjusting plate (9) extends outward from the upper end of the connection node, and a plurality of adjusting holes (11) for inserting the end portions of the isolation strip (8) are formed in the adjusting plate (9); Positioning hooks (10) are fixedly connected to both sides of the isolation strip (8), the positioning hooks (10) are located between the adjusting plate (9) and the sheet (1), and the edges of adjacent sheets (1) are respectively inserted into the two positioning hooks (10); The number of layers of the oriented bundle layer gradually increases from the center of the width of the sheet (1) along its two width edges.

2. A welded plastic geocell according to claim 1, characterized in that: At least one of the upper and lower width edges of the sheet (1) is set as a curved edge, and the width of the sheet (1) gradually becomes narrower along the direction away from the transverse rib (2) at its end.

3. A welded plastic geocell according to claim 2, characterized in that: The sheet (1) is provided with N through holes (5), the planar projection pattern of the through holes (5) is an ellipse or a spindle shape, the long axis of the through holes (5) is parallel to the length direction of the sheet (1), and the length of the long axis of the through holes (5) is less than or equal to the length of the sheet (1). The N through holes (5) divide the sheet (1) into N + 1 small pieces along its width direction, and the width of the small pieces gradually becomes wider from the narrowest part in the middle along the direction close to the transverse ribs (2) at its two ends. The number N of the through holes (5) is a natural number.

4. A welded plastic geocell according to claim 1, characterized in that: It further includes a connector (7) arranged in the connection node, and the connector (7) is a hot-melt plastic column, a rivet, a bolt, a U-shaped nail or any combination of the above connectors.

5. A manufacturing method of the welded plastic geocell according to any one of claims 1-4, characterized in that, It includes the following steps: a. The polymer and its processing aids are mixed, fed, passed through an extrusion system of an extruder and a coat hanger die head to form a plastic melt in a plastic molten state, and the temperature of the extrusion system of the extruder and the coat hanger die head is controlled at 130°C - 320°C; b. The plastic melt in a molten state is cooled and shaped by a three-roll calender with a roller provided with grooves. Among them, at least two of the rollers of the three-roll calender are groove rollers arranged opposite to each other, the depth of the groove rollers is not less than 1 mm, and the temperature of the rollers of the three-roll calender is controlled at 20°C - 95°C; c. The plastic tape cooled by the three-roll calender is cut into plastic strips with a width greater than 40 mm; d. The plastic strips enter a stretching device for longitudinal stretching to obtain a cell sheet body, and the parts rolled out by the groove rollers arranged opposite to each other are stretched to form transverse ribs (2), and the longitudinal stretching temperature is 80°C - 350°C; e. The transverse ribs (2) on adjacent cell sheet bodies are welded and connected at intervals through an automatic welding machine to form a plastic geogrid; f. Hot melt weld the adjusting plates (9) on both sides of the connection node, insert the upper end of the isolation strip (8) into the adjusting holes (11) of the adjusting plates (9), and insert the edges of the sheet (1) into the positioning hooks (10) respectively.

6. The manufacturing method according to claim 5, characterized in that: The high molecular polymer is PP, HDPE or PET. The processing aids include antioxidants, ultraviolet absorbers and carbon black. The addition amount of the antioxidant is 0.02% of the mass parts of the high molecular polymer, the addition amount of the ultraviolet absorber is 0.01% of the mass parts of the high molecular polymer, and the addition amount of the carbon black is 2.1% of the mass parts of the high molecular polymer.

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