NL2030994B1 - A bidirectional stretched soil reinforced grid and a method for manufacturing same - Google Patents

A bidirectional stretched soil reinforced grid and a method for manufacturing same Download PDF

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Publication number
NL2030994B1
NL2030994B1 NL2030994A NL2030994A NL2030994B1 NL 2030994 B1 NL2030994 B1 NL 2030994B1 NL 2030994 A NL2030994 A NL 2030994A NL 2030994 A NL2030994 A NL 2030994A NL 2030994 B1 NL2030994 B1 NL 2030994B1
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NL
Netherlands
Prior art keywords
longitudinal
transverse
punch
strength
bidirectional
Prior art date
Application number
NL2030994A
Other languages
Dutch (nl)
Inventor
Yuan Shaopeng
Guo Yuanfeng
Tang Yonggang
Wang Yanfeng
Zhou Keqing
Zhu Chunguo
Xu Fangjun
Yang Baohe
Xia Wang
Chen Lili
Wang Xulong
Zheng Hong
Dai Zhengjie
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Bostd Geosynthetics Qingdao Ltd
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Priority to NL2030994A priority Critical patent/NL2030994B1/en
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Publication of NL2030994B1 publication Critical patent/NL2030994B1/en

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    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D17/00—Excavations; Bordering of excavations; Making embankments
    • E02D17/20—Securing of slopes or inclines
    • E02D17/202—Securing of slopes or inclines with flexible securing means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26F—PERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
    • B26F1/00—Perforating; Punching; Cutting-out; Stamping-out; Apparatus therefor
    • B26F1/38—Cutting-out; Stamping-out
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26F—PERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
    • B26F1/00—Perforating; Punching; Cutting-out; Stamping-out; Apparatus therefor
    • B26F1/38—Cutting-out; Stamping-out
    • B26F1/3853—Cutting-out; Stamping-out cutting out frames
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
    • B29C55/02—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets
    • B29C55/10—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial
    • B29C55/12—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial biaxial
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D2300/00—Materials
    • E02D2300/0085—Geotextiles

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Forests & Forestry (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Paleontology (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Pit Excavations, Shoring, Fill Or Stabilisation Of Slopes (AREA)

Abstract

The invention provides a bidirectional stretched soil reinforced grid and a method for manufacturing same, comprising meshes, longitudinal ribs and transverse ribs formed by punching and bidirectionally stretching an extruded plate, characterized in that the stretch strengths of the bidirectional stretched. soil reinforced grid in the longitudinal and transverse directions are different, and the ratio of the stretch strength in the high strength. direction. to the stretch strength. in the low strength direction is: 2:1—6:l, and the ratio of the cross—sectional area of the high—strength directional rib to the low—strength directional rib of the bidirectional stretched. soil reinforced grid is l:l—4:l. The stretch strength in the high strength direction of the bidirectional stretched soil reinforced grid is higher than 50 kN/m, and the stretch strength in the low strength direction is not lower than 10 kN/m.

Description

P1152 /NLpd
A BIDIRECTICNAL STRETCHED SOIL REINFORCED GRID AND A METHOD FOR
MANUFACTURING SAME
TECHNICAL FIELD
The invention belongs to the technical field of geotechnical materials, and particularly relates to a bidirectional stretched soil reinforced grid and a method for manufacturing same.
BACKGROUND ART
At present, the overall stretched bidirectional grid on the market has equal strength in longitudinal and transverse direc- tions, and the maximum strength is 50kN/m. In many practical pro- jects, the geogrid strength of 50 kN/m is low, in order to meet the stability of deep sliding of roadbed slope, the geogrid with higher strength is needed to meet the stability safety factor re- quired by the specification. At present, the maximum strength of the overall stretched bidirectional grid is only 50 kN/m, so in order to ensure the stability of the roadbed slope, the slope gra- dient has to be slowed down or additional ground treatment has to be adopted in the project. The way of slowing down the slope gra- dient will increase the occupied area and increase the amount of filling earth, which not only increases the project cost but also causes damage to the environment. If the method of ground treat- ment is used to improve the stability of slope, the cost of the project needs to be greatly increased.
The disadvantages of the prior art are as follows:
The unidirectional stretched plastic geogrids have high lon- gitudinal strength but low transverse strength, which does not meet the requirements of certain projects on transverse strength.
If such unidirectional grid is used in road project, the stability of deep sliding of slope can be guaranteed, but the effect of re- straining the deformation of roadbed fill in this direction is ba- sically not available because the strength of grid along the di- rection of road is very low. Under the action of long-term traffic load, self-weight of filler and other external factors, the roads are easily subjected to the destruction of roadbed and pavement, affecting the use of roads.
The difference in strength in the longitudinal and transverse directions is achieved by adjusting the thickness and length of the ribs in Chinese Patent (patent number: ZL201520171531.7). How- ever, the technology of the patent is more suitable for tack- welded grids, and it is difficult to adjust and realize the pro- cessing technology of stretched plastic geogrid, and the patent only realizes that transverse strength>longitudinal strength.
SUMMARY
In order to solve the above-mentioned problems existing in the prior art, the invention provides a bidirectional stretched soil reinforced grid and a method for manufacturing same. The me- chanical properties of the grid product in the primary stress di- rection are greatly improved, and the appropriate mechanical prop- erties of the grid product in the secondary stress direction are ensured; in addition, the torsional rigidity and mesh stability of the grid product are greatly improved, thereby improving the rein- forcement effect of the base layer.
The objective of the invention is achieved by the following technical solution:
A bidirectional stretched soil reinforced grid, comprising meshes, longitudinal ribs and transverse ribs formed by punching and bidirectionally stretching an extruded plate, characterized in that the stretch strengths of the bidirectional stretched soil re- inforced grid in the longitudinal and transverse directions are different, and the ratio of the stretch strength in the high strength direction to the stretch strength in the low strength di- rection is: 2:1-6:1, the stretch strength in the high strength di- rection of the bidirectional stretched soil reinforced grid is higher than 50 kN/m, and the stretch strength in the low strength direction is not lower than 10 kN/m.
The improvement to the above technical solution is that: the ratio of the cross-sectional area of the high-strength directional rib to the low-strength directional rib of the bidirectional stretched soil reinforced grid is 1:1-4:1.
Further improvement to the above technical solution is that: the ratio of the number of ribs per meter of the high strength di- rection and the low strength direction of the bidirectional stretched soil reinforced grid is 1.3:1-6:1.
A method for manufacturing a bidirectional stretched soil re- inforced grid as described above, characterized in that the bidi- rectional stretched soil reinforced grid is manufactured by using an extruded plate punch punching and a longitudinal and transverse stretching process, characterized in that the punch punching and longitudinal and transverse stretching process comprises the fol- lowing steps of: (1) punching the extruded plate by a punch using a punch; (2) feeding same into a longitudinal stretching machine for longitudinal stretching at a longitudinal stretch rate of 1.5-10, and then a transverse stretching machine for transverse stretching at a transverse stretch rate of 1.5-10, and then cooling, trimming and finishing, and then winding, so as to obtain a bidirectional stretched soil reinforced grid with meshes, longitudinal ribs and transverse ribs.
The advantages and positive effects of the invention are as follows: 1. Since the bidirectional stretched soil reinforced grid of the invention greatly improves the strength in one primary stress direction while ensuring that the other direction also has a high- er strength, it is possible to meet the safety and stability of the slope by using a geogrid with a higher strength, without the need to increase the occupied area, increase the amount of filling earth, additional ground treatment measures, etc. which can not only greatly save the project cost, but also effectively reduce the encroachment of the land and the excavation damage of the filled earth, and minimize the damage to the natural environment, with significant economic and social benefits.
BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 is a schematic view showing the structure of a bidi- rectional stretched soil reinforced grid of the invention;
Fig. 2 is a right view of Fig. 1;
Fig. 3 is a top view of Fig. 1.
DETAILED DESCRIPTION OF THE EMBODIMENTS
The invention is described in further detail below:
With reference to Figs. 1-3, a specific embodiment of a bidi- rectional stretched soil reinforced grid of the invention compris- es a mesh 3, a longitudinal rib 2 and a transverse rib 1 formed by punching and bidirectionally stretching an extruded plate, wherein the stretch strengths of the bidirectional stretched soil rein- forced grid in the longitudinal and transverse directions are dif- ferent, and the ratio of the stretch strength in the high strength direction to the stretch strength in the low strength direction is: 2:1-6:1, the stretch strength in the high strength direction of the bidirectional stretched soil reinforced grid is higher than 50 kN/m, and the stretch strength in the low strength direction is not lower than 10 kN/m.
The following are specific embodiments of the bidirectional stretched soil reinforced grid of the invention:
With reference to Figs. 1-3, an embodiment 1 of a bidirec- tional stretched soil reinforced grid of the invention comprises a mesh 3, a longitudinal rib 2 and a transverse rib 1 formed by punching and bidirectionally stretching an extruded plate. The ra- tio of the longitudinal stretch strength to the transverse stretch strength of the bidirectional stretched soil reinforced grid is: 2.5:1; the ratio of the cross-sectional area of the longitudinal rib 2 to the transverse rib 1 of the bidirectional stretched soil reinforced grid is 1:1; the ratio of the number of the longitudi- nal rib 2 to the transverse rib 1 per meter of the bidirectional stretched soil reinforced grid is 2:1. The thickness of the above- mentioned longitudinal rib 2 is greater than the thickness of the transverse rib 1, and the thickness at the node where the longitu- dinal rib 2 intersects with the transverse rib 1 is twice the thickness of the longitudinal rib 2. The longitudinal length a of the mesh 3 is 80mm, and the transverse length b is 40mm.
With reference to Figs. 1-3, an embodiment 2 of a bidirec- tional stretched soil reinforced grid of the invention comprises a mesh 3, a longitudinal rib 2 and a transverse rib 1 formed by punching and bidirectionally stretching an extruded plate. The ra- tio of the longitudinal stretch strength to the transverse stretch strength of the bidirectional stretched soil reinforced grid is: 4:1; the ratio of the cross-sectional area of the longitudinal rib 5 2 to the transverse rib 1 of the bidirectional stretched soil re- inforced grid is 2:1. The ratic of the number of the longitudinal rib 2 to the transverse rib 1 per meter of the bidirectional stretched soil reinforced grid is 3:1. The thickness of the above- mentioned longitudinal rib 2 is greater than the thickness of the transverse rib 1, and the thickness at the node where the longitu- dinal rib 2 intersects with the transverse rib 1 is 1.5 times the thickness of the longitudinal rib 2. The longitudinal length a of the mesh 3 is 90mm, and the transverse length b is 30mm.
With reference to Figs. 1-3, an embodiment 3 of a bidirec- tional stretched soil reinforced grid of the invention comprises a mesh 3, a longitudinal rib 2 and a transverse rib 1 formed by punching and bidirectionally stretching an extruded plate. The ra- tio of the transverse stretch strength to the longitudinal stretch strength of the bidirectional stretched soil reinforced grid is: 6:1; the ratio of the cross-sectional area of the transverse rib 1 to the longitudinal rib 2 of the bidirectional stretched soil re- inforced grid is 3:1; the ratio of the number of the transverse rib 1 to the longitudinal rib 2 per meter of the bidirectional stretched soil reinforced grid is 4:1. The thickness of the above- mentioned transverse rib 1 is greater than the thickness of the longitudinal rib 2, and the thickness at the node where the longi- tudinal rib 2 intersects with the transverse rib 1 is 1.5 times the thickness of the transverse rib 1. The longitudinal length a of the mesh 3 is 30mm, and the transverse length b is 120mm.
With reference to Figs. 1-3, an embodiment of a method for manufacturing the above-mentioned bidirectional stretched soil re- inforced grid of the invention, wherein the bidirectional stretched soil reinforced grid is manufactured by using an extrud- ed plate punch punching and a longitudinal and transverse stretch- ing process, and the punch punching and longitudinal and trans- verse stretching process comprises the following steps of: (1) punching the extruded plate by a punch using a punch;
(2) feeding same into a longitudinal stretching machine for longitudinal stretching at a longitudinal stretch rate of 1.5-10, and then a transverse stretching machine for transverse stretching at a transverse stretch rate of 1.5-10, and then cooling, trimming and finishing, and then winding, so as to obtain a bidirectional stretched soil reinforced grid with meshes, longitudinal ribs and transverse ribs.
Preferably, the above-mentioned punch has a maximum external dimension ranging from 2 to 20 mm; the ratio of the maximum exter- nal dimension of the punch to the thickness of the plastic plate is not less than 0.3.
Specifically speaking, the shape of the mesh is rectangular, the four corners of the mesh are arc-shaped, the mesh longitudinal dimension is a, the mesh transverse dimension is b, the punch end face longitudinal dimension is al, the punch end face transverse dimension is bl, the punch longitudinal spacing is a2, and the punch transverse spacing is b2; the ratio of the strength of the bidirectional stretched soil reinforced grid in the longitudinal and transverse directions is c, the longitudinal stretch rate is 5-10, and the transverse stretch rate is 5-10.
The above-mentioned punch longitudinal dimension al=a/10-a/5, the punch transverse dimension bl=b/10-b/5;
The arrangement of the above-mentioned punch is: the punch longitudinal spacing a2 is greater than the punch end face longi- tudinal dimension al, and the punch transverse spacing b2=bl1+bc{(a2-al)/a.
Further, if the ratio of the stretch strength in the high strength direction to the stretch strength in the low strength di- rection of the bidirectional stretched soil reinforced grid after processing slightly deviates from the process design value, the longitudinal stretch strength of the bidirectional stretched soil reinforced grid is reduced by increasing the punch transverse di- mension bl or reducing the punch transverse arrangement b2; or the longitudinal stretch strength of the bidirectional stretched soil reinforced grid is increased by reducing the punch transverse di- mension bl or increasing the punch transverse arrangement b2; or the transverse stretch strength of the bidirectional stretched soil reinforced grid is reduced by increasing the punch longitudi- nal dimension al or reducing the punch longitudinaal arrangement a2; or the transverse stretch strength of the bidirectional stretched soil reinforced grid is increased by reducing the punch longitudinal dimension al or increasing the punch longitudinal ar- rangement a2.
Still further, if it is necessary to increase or reduce the stretch strength of the longitudinal and transverse directions of the bidirectional stretched soil reinforced grid as a whole, it may be achieved by proportionally increasing or reducing the thickness of the plastic plate, or by proportionally increasing or reducing the values of a2-al and b2-bl.
An embodiment 1 of a method for manufacturing the above- mentioned bidirectional stretched soil reinforced grid of the in- vention:
The process design parameters are: the longitudinal dimension a of the mesh 3 is 40 mm, the transverse dimension b of the mesh 3 is 20 mm, and the ratio of the longitudinal stretch strength to the transverse stretch strength of the bidirectional stretched plastic geogrid is: 5:1, the thickness of the plastic extruded plate is 4 mm, and the punch dimensions al and bl are both 4 mm.
The punch arrangement is: the punch longitudinal spacing a2 is 12 mm, and the punch transverse spacing b2 is about (12- 4yx(5:1)/(40:20)+4=24 mm. The longitudinal stretch rate is 40/4=10, and the transverse stretch rate is 20/4=5. After pulling out the product, the longitudinal stretch strength is 75.2 kN/m, the transverse stretch strength is 18.7 kN/m, and the ratio of longitudinal and transverse stretch strength is about 4:1.
The punch dimensions are adjusted and the longitudinal spac- ing a2 is adjusted to 4+(12-4)/18.7x(18.7-15)=5.6 mm. After pull- ing out the product, the longitudinal stretch strength is 75.1 kN/m, the transverse stretch strength is 14.8 kN/m, the ratio of the longitudinal and transverse stretch strength is about 5.07:1, the ratio of the number of ribs per meter in the longitudinal and transverse directions is about 1.6:1, the thickness at the node where the above-mentioned longitudinal ribs 2 intersects with the transverse rib 1 is 2.1 times the thickness of the thicker rib of the longitudinal rib 2 and the transverse rib 1, and the ratio of the cross-sectional area in the longitudinal and transverse direc- tions is 1.5.
It is to be understood that the above description is not in- tended to limit the invention, and the invention is not limited to the above examples, and those skilled in the art will appreciate that various changes, modifications, additions and substitutions can be made without departing from the spirit and scope of the present invention.

Claims (3)

CONCLUSIESCONCLUSIONS 1. Bidirectioneel gerekt grondversterkt rooster, omvattende mazen, langsribben en dwarsribben gevormd door ponsen en bidirectioneel rekken van een geëxtrudeerde plaat, met het kenmerk, dat de reksterkten van het bidirectioneel uitgerekte grondversterkte rooster in de lengte- en dwarsrichting verschillend zijn, en de verhouding van de reksterkte in de richting met hoge sterkte tot de reksterkte in de richting van lage sterkte is: 2:1 tot 6:1, de reksterkte in de richting met hoge sterkte van het bidirectionele gerekte grondversterkte rooster hoger is dan 50 kN/m , en de reksterkte in de richting met lage sterkte niet lager is dan 10 kN/m.1. Bidirectionally stretched ground-reinforced grid, comprising meshes, longitudinal ribs and transverse ribs formed by punching and bidirectional stretching of an extruded sheet, characterized in that the tensile strengths of the bidirectionally stretched ground-reinforced grid are different in the longitudinal and transverse directions, and the ratio of the tensile strength in the high strength direction to the tensile strength in the low strength direction is: 2:1 to 6:1, the tensile strength in the high strength direction of the bidirectional stretched ground-reinforced grid is higher than 50 kN/m , and the yield strength in the low strength direction is not less than 10 kN/m. 2. Werkwijze voor het vervaardigen van een bidirectioneel gerekt grond versterkt rooster, met het kenmerk, dat het bidirectionele gerekte grond versterkte rooster wordt vervaardigd door gebruik te maken van geëxtrudeerd plaatgatponsen en een longitudinaal en transversaal rekproces, met het kenmerk dat het gatponsen en het proces van longitudinaal en transversaal rekken de volgende stap- pen omvat: (1) de geëxtrudeerde plaat ponsen door een pons met een ponsin- richting; (2) het product in een longitudinale rekmachine voeren voor longi- tudinaal rekken met een longitudinale reksnelheid van 1,5 tot 10, en vervolgens in een transversale rekmachine voor transversale rekken met een transversale reksnelheid van 1,5 tot 10, en dan af- koelen, trimmen en afwerken, en dan opwinden , om een bidirectioneel uitgerekt grondversterkt rooster te verkrijgen met mazen, langsribben en dwarsribben.2. Method for manufacturing a bidirectional stretched ground reinforced grid, characterized in that the bidirectional stretched ground reinforced grid is manufactured by using extruded plate hole punching and a longitudinal and transverse stretching process, characterized in that the hole punching and process of longitudinal and transverse stretching involves the following steps: (1) punching the extruded sheet through a punch with a punching device; (2) feeding the product into a longitudinal stretching machine for longitudinal stretching with a longitudinal stretching rate of 1.5 to 10, and then into a transverse stretching machine for transverse stretching with a transverse stretching rate of 1.5 to 10, and then finishing cooling, trimming and finishing, and then winding, to obtain a bidirectional stretched ground-reinforced lattice with meshes, longitudinal ribs and transverse ribs. 3. Werkwijze voor het vervaardigen van een in twee richtingen uit- gerekt, met grond versterkt rooster volgens conclusie 2, met het kenmerk, dat de vorm van het gaas rechthoekig is, de vier hoeken van het gaas boogvormig zijn, de langsafmeting van het gaas a is, de dwarsafmeting van het gaas b is, de langsafmeting van het pon-3. Method for manufacturing a two-way stretched, soil-reinforced grid according to claim 2, characterized in that the shape of the mesh is rectangular, the four corners of the mesh are arcuate, the longitudinal dimension of the mesh a is the transverse dimension of the mesh b is the longitudinal dimension of the pon- seindvlak al is, de dwarsafmeting van het ponseindvlak bl is, de langsafstand van de pons a2 is en de dwarsafstand van de pons b2 is; de verhouding van de sterkte van het bidirectionele uitgerek- te, met grond versterkte rooster in de lengte- en dwarsrichting c is, de longitudinale reksnelheid 5 tot 10 is en de transversale reksnelheid 5 tot 10 is; de pons langsafmeting al=a/10 tot a/5, de pons dwarsafmeting bl=b/10 tot b/5; de opstelling van de stempel is: de lengteafstand van de stempel a2 is groter dan de lengtemaat al van het eindvlak van de stempel en de dwarsafstand van de stem- pel b2=bl+bc(a2-al)/a.punch end face is a1, the transverse dimension of the punch end face is b1, the longitudinal distance of the punch is a2 and the transverse distance of the punch is b2; the ratio of the strength of the bidirectional stretched soil reinforced lattice in the longitudinal and transverse directions is c, the longitudinal strain rate is 5 to 10 and the transverse strain rate is 5 to 10; the punch longitudinal dimension al=a/10 to a/5, the punch transverse dimension bl=b/10 to b/5; the arrangement of the punch is: the longitudinal distance of the punch a2 is greater than the length al of the end face of the punch and the transverse distance of the punch b2=bl+bc(a2-al)/a.
NL2030994A 2022-02-17 2022-02-17 A bidirectional stretched soil reinforced grid and a method for manufacturing same NL2030994B1 (en)

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NL2030994A NL2030994B1 (en) 2022-02-17 2022-02-17 A bidirectional stretched soil reinforced grid and a method for manufacturing same

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Application Number Priority Date Filing Date Title
NL2030994A NL2030994B1 (en) 2022-02-17 2022-02-17 A bidirectional stretched soil reinforced grid and a method for manufacturing same

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NL2030994B1 true NL2030994B1 (en) 2023-08-28

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