CN205115355U - Sensing type geogrid structure - Google Patents

Sensing type geogrid structure Download PDF

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Publication number
CN205115355U
CN205115355U CN201520933679.XU CN201520933679U CN205115355U CN 205115355 U CN205115355 U CN 205115355U CN 201520933679 U CN201520933679 U CN 201520933679U CN 205115355 U CN205115355 U CN 205115355U
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rib
sensing type
grid
grid structure
main rib
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CN201520933679.XU
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侯飞
崔新壮
刘泽群
金青
黄丹
张炯
汤潍泽
楼俊杰
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Shandong University
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Shandong University
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Abstract

The utility model relates to a sensing type geogrid structure, include the main rib and assistance rib that constitute by the polymer that has added conductive filler, main rib locates to connect at the node with the assistance rib, main rib's diameter is greater than assist the diameter of rib, according to relation between polymer resistance and the deformation is through measuring the deformation value of geogrid structure is acquireed to the resistance value of polymer. The utility model provides a rub sensing type geogrid's that hinders manufacturing method of height, this type geogrid had both overcome the not enough problem of traditional geogrid self intensity, the quick effect of drawing of conducting polymer combined material has been utilized again, the grid that obtains that can be convenient through the resistance change that detects grid self reaches the deformation information that adds the solid, need not the implantation of external sensor and other equipment, thereby disturbance and the emergence of the durability of sensor less than the phenomenon own to adding the solid have been avoided, be applicable to the deformation monitoring and the safety precaution of geotechnological structure in the whole life cycle.

Description

A kind of sensing type geo-grid structure
Technical field
The utility model relates to field of civil engineering, particularly a kind of sensing type geo-grid structure.
Background technology
Geo-grid has obtained and has utilized widely, and achieved huge economic results in society since producing in the engineerings such as road, water conservancy, building.Geo-grid is as a kind of conventional Earthworking reinforced bar material, be with the high molecular polymer such as polypropylene, polyvinyl chloride through the two-dimensional mesh trellis of thermoplastic or mold pressing or the 3 D stereo grid screen with certain altitude, be used for Reinforced Embankment engineering, basement process and embankment slope protection works.What require the construction quality such as road, building along with society improves constantly, and the requirement of engineering to geo-grid performance and function is also more and more higher.But at present, geo-grid product only has single reinforcement effects usually, and due to the strength of materials of himself and the problem of design, cause that the tensile strength of geo-grid in Practical Project is lower, friction resistance is poor, the actual reinforcement effects played is limited; Meanwhile, existing geo-grid reinforcement means cannot detect the deformation information of self and reinforcing body thereof easily, if carry out detecting, needs the support of other equipment and technology, increases difficulty and the cost of monitoring.
Utility model content
The purpose of this utility model is for overcoming above-mentioned the deficiencies in the prior art, provides a kind of sensing type geo-grid structure.
In order to reach above-mentioned purpose, the utility model adopts following technical scheme:
A kind of sensing type geo-grid material, comprises polymeric matrix, adds carbon nanotube and superconduction carbon black as conductive filler material in described polymeric matrix.
The utility model proposes a kind of sensing type geo-grid material of adding carbon nanotube, superconduction carbon black.As the filler of conducting polymer composite, carbon nanotube is a kind of novel texture material of carbon, has abnormal excellent mechanics, electricity and chemical property, and going deep into along with carbon nanotube research, its application prospect constantly shows; Superconduction carbon black has low resistance or high resistance performance, can give goods electric action, and its feature is that particle diameter is little, and specific surface area is large and coarse etc.With the addition of the geo-grid of carbon nanotube and superconduction carbon black, what can utilize conductive polymer composite draws quick effect, the deformation information of grid and reinforcing body can be obtained easily by the resistance change detecting grid self, without the need to the implantation of external sensor and other equipment, thus the generation avoided the disturbance of reinforcing body and the weather resistance of sensor own not foot phenomenon, be applicable to deformation monitoring and the safe early warning of earth structure in life cycle management.
Described polymeric matrix is high density polyethylene(HDPE) matrix, and described carbon nanotube accounts for the 3%-7% of raw material total mass, and described superconduction carbon black accounts for the 6%-14% of raw material total mass.
Select high density polyethylene(HDPE) to be polymeric matrix, the matrix material of high-strength and high-conductivity can be obtained.Carbon nanotube is spiked in high density polyethylene(HDPE) matrix different on the impact of substrate performance with superconduction carbon black as filler, carbon nanotube is as mechanics and the conductivity that can improve polymkeric substance during filler simultaneously, but Financial cost is high, and adds superconduction carbon black and reduce mechanical property when obtaining the conductivity of complex body.Carbon nanotube and superconduction carbon black are under this ratio, and Financial cost is lower, and can obtain the good electroconductibility of complex body and mechanical property.
The mass ratio of described carbon nanotube and described superconduction carbon black is 1:2.
Carbon nanotube and superconduction carbon black adopt said ratio, can obtain the geo-grid material of high strength height frictional resistance.
Add nm-class active calcium carbonate in described conductive filler material, described nm-class active calcium carbonate accounts for the 10%-30% of raw material total mass.
When adding carbon nanotube or superconduction carbon black separately in matrix polymer, usually the more carbon nanotube of interpolation or superconduction carbon black is needed could to obtain desirable electroconductibility, when causing adding more carbon nanotube, the manufacturing cost of matrix material is very high, and economic feasibility is lower; The comprehensive strength adding matrix material during the carbon black of larger content is lower, and mechanical property is poor.Therefore, the utility model employs carbon nanotube and superconduction carbon black as conductive filler material simultaneously, and based on carbon nanotube conducting, superconduction carbon black is auxiliary, adds appropriate inorganic particulate nano calcium carbonate in matrix simultaneously.First nano-calcium carbonate gets rid of effect by volume in the composite, promote the mutual overlap joint be more prone between carbon nanotube, thus improve the conductivity of matrix material, also cause particle surrounding matrix generation severe plastic deformation dissipation energy reach activeness and quietness object by inorganic solid particles and basal body interface unsticking simultaneously.
Add titanate coupling agent in described nm-class active calcium carbonate, described titanate coupling agent is the 2%-5% of described nm-class active calcium carbonate quality.
In order to make nano-calcium carbonate dispersed in the base, avoid the performance that agglomeration affects complex body occurs, the utility model selects stearic acid-treated nm-class active calcium carbonate, simultaneously in order to improve dispersiveness between nano-calcium carbonate and polymeric matrix and cohesive force uses titanate coupling agent to carry out surface modification to nano-calcium carbonate, improve the consistency of itself and matrix.
A kind of sensing type geo-grid structure, comprise the main rib and auxiliary rib that are made up of the polymkeric substance that with the addition of conductive filler material, described main rib is connected at node place with auxiliary rib, and the diameter of described main rib is greater than the diameter of described auxiliary rib; According to the relation between described polymer resistive and distortion, by measuring the resistance value of described polymkeric substance, obtain the deformation values of geo-grid structure.
What the utility model make use of conductive polymer composite draws quick effect, the deformation information of grid and reinforcing body can be obtained easily by the resistance change detecting grid self, without the need to the implantation of external sensor and other equipment, thus the generation avoided the disturbance of reinforcing body and the weather resistance of sensor own not foot phenomenon, be applicable to deformation monitoring and the safe early warning of earth structure in life cycle management.
Described main rib is longitudinally arranged in parallel, and described main rib is provided with continuous print projection, and described projection is arranged along the surperficial broken-line type of described main rib.
Described node is provided with projection, and described projection is arranged along the diagonal lines line style of described node.
Described projection is that undaform is arranged along the surface of described main rib.
Projection is set and can increases contact area between grid and reinforcing body, with increasing friction force, under the effect preventing grid from applying in external force due to rub deficiency and with the phenomenon of reinforcing body generation relatively sliding.
The height of described projection is 2-4mm.
Described auxiliary rib diagonally with described main rib cross connection.
Described auxiliary rib is connected with described auxiliary rib is vertical.
The beneficial effects of the utility model are:
The utility model proposes a kind of interpolation carbon nanotube, superconduction carbon black, the high strength of nano-calcium carbonate, the making method of the sensing type geo-grid of high frictional resistance, the type geo-grid had both overcome the inadequate problem of traditional geo-grid self-strength, what make use of again conductive polymer composite draws quick effect, the deformation information of grid and reinforcing body can be obtained easily by the resistance change detecting grid self, without the need to the implantation of external sensor and other equipment, thus the generation avoided the disturbance of reinforcing body and the weather resistance of sensor own not foot phenomenon, be applicable to deformation monitoring and the safe early warning of earth structure in life cycle management.Friction resistance for existing geo-grid and reinforcing body is not enough, and the generation of grid sliding phenomenon in reinforcing body, the utility model improves the resemblance of grid again, increases the contact friction between grid and reinforcing body.The utility model employs ceramic cheap in a large number, and reduce production cost while improving grid performance, economic feasibility is high, has extremely wide application prospect.
Accompanying drawing explanation
Fig. 1 is polymkeric substance percolation phenomena schematic diagram;
Fig. 2 is grid net type figure;
Fig. 3 is main rib and node schematic diagram;
Fig. 4 is the variation relation matched curve of normalized resistance rate with strain;
In figure: 1, main rib; 2, auxiliary rib; 3, node; 4, main rib is protruding; 5, node is protruding.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described in detail.
Principle:
(1) filled composite type conducting polymer composite is most widely used conducing composite material, and it in matrix polymer, adds the conductive filler materials such as carbon nanotube, superconduction carbon black, carbon fiber, graphite be composited.As the filler of conducting polymer composite, carbon nanotube is a kind of novel texture material of carbon, has abnormal excellent mechanics, electricity and chemical property, and going deep into along with carbon nanotube research, its application prospect constantly shows; Superconduction carbon black has low resistance or high resistance performance, can give goods electric action, and its feature is that particle diameter is little, and specific surface area is large and coarse etc.But, when adding carbon nanotube or superconduction carbon black separately in matrix polymer, usually need the more carbon nanotube of interpolation or superconduction carbon black could obtain desirable electroconductibility, when causing adding more carbon nanotube, the manufacturing cost of matrix material is very high, and economic feasibility is lower; The comprehensive strength adding matrix material during the carbon black of larger content is lower, and mechanical property is poor.Therefore, the utility model employs carbon nanotube and superconduction carbon black as conductive filler material simultaneously, and based on carbon nanotube conducting, superconduction carbon black is auxiliary, adds appropriate inorganic particulate nano calcium carbonate in matrix simultaneously.First nano-calcium carbonate gets rid of effect by volume in the composite, promote the mutual overlap joint be more prone between carbon nanotube, thus improve the conductivity of matrix material, also cause particle surrounding matrix generation severe plastic deformation dissipation energy reach activeness and quietness object by inorganic solid particles and basal body interface unsticking simultaneously.
(2) conductive polymer composite has typical percolation phenomena, shows as the conductive polymer composite process that resistivity sharply declines along with the increase of filler content, as shown in Figure 1.The conductive polymer composite region that resistivity sharply declines along with the content increase of filler, is called as diafiltration region.Meanwhile, conductive polymer composite has agility usually, shows as and draws quick effect or voltage-sensitive effect.Wherein, conductive polymer composite resistance under external pull effect, by the transition process of low resistance to high value, shows as the increase of composite material resistance rate to draw quick effect to refer to.Conductive polymeric fillers content when selecting change in resistance the most obvious in practical application, i.e. specific best filler content, utilize the variation relation of conductive polymer composite resistivity under a stretching force to determine its deformation size, and prepare sensing type geo-grid with this rule.
Implementation step:
(1) determination of filler and optimum content thereof in grid;
Carbon nanotube is spiked in high density polyethylene(HDPE) matrix different on the impact of substrate performance with superconduction carbon black as filler, carbon nanotube is as mechanics and the conductivity that can improve polymkeric substance during filler simultaneously, but Financial cost is high, and adds superconduction carbon black and reduce mechanical property when obtaining the conductivity of complex body.Probe into and how under lower Financial cost, to obtain the good electroconductibility of complex body and mechanical property becomes important problem.Therefore, the utility model uses carbon nanotube and superconduction carbon black as conductive filler material simultaneously, based on carbon nanotube conducting path, superconduction carbon black is auxiliary, simultaneously, in order to the content reducing carbon nanotube and superconduction carbon black reduces the production cost of complex body, and don't affect the conductive and mechanical properties of complex body, the utility model with the addition of inorganic toughening modifying filler nanometer calcium carbonate simultaneously in polymeric matrix.Nano-calcium carbonate as inorganic toughness reinforcing uniform filling dispersion in the base, both got rid of by volume the possibility that effect increases overlap joint mutually between carbon nanotube, strengthen the electroconductibility of polymkeric substance, reach complex body activeness and quietness object by inorganic solid particles and basal body interface unsticking effect again.In order to make nano-calcium carbonate dispersed in the base, avoid the performance that agglomeration affects complex body occurs, the utility model selects stearic acid-treated nm-class active calcium carbonate, simultaneously in order to improve dispersiveness between nano-calcium carbonate and polymeric matrix and cohesive force uses titanate coupling agent to carry out surface modification to nano-calcium carbonate, improve the consistency of itself and matrix.
In order to obtain high-strength and high-conductivity matrix material, the utility model selects high density polyethylene(HDPE) to be polymeric matrix, and carbon nanotube and superconduction carbon black are conductive filler material, adds stearic acid-treated nm-class active calcium carbonate and titanic acid ester coupling simultaneously.In conductive filler material, carbon nanotube and superconduction carbon black add according to the ratio of 1:2, and massfraction shared by carbon nanotube is 3% ~ 7%, and the massfraction of corresponding superconduction carbon black is 6% ~ 14%; The shared massfraction of nm-class active calcium carbonate is 10% ~ 30%; The content of titanate coupling agent is nm-class active calcium carbonate 2% ~ 5%, and the massfraction of high density polyethylene(HDPE) is 49% ~ 81%.
(2) determination of deformable polymer and sensitivity:
By indoor tension test, obtain the relation curve between polymer resistive and distortion, obtain the funtcional relationship between the two: Ω/Ω 0=F (ε), wherein Ω 0for polymkeric substance initial resistance, measuring resistance when Ω is polymkeric substance tension test, Ω/Ω 0be called normalized resistance rate, ε is strain value.
(3) determination of grid profile:
Existing grid is usually because self friction resistance causes the generation occurring grid sliding phenomenon in reinforcing body in engineering not, affect the result of use of grid, in order to solve the problem, can determine the funtcional relationship between grid distortion and resistance more accurately, the utility model has carried out design as shown in Figure 2,3 to grid simultaneously.As shown in Figure 2, grid is divided into main rib 1, auxiliary rib 2 and node 3 to form, and main rib 1 is comparatively thick, and for main conductive path and provide main longitudinal stretching force, auxiliary rib is comparatively thin, in order to auxiliary main rib with provide lateral tensile force.Fig. 3 is main rib and node schematic diagram, main rib is provided with the main rib projection 4 that broken line is arranged, node is diagonally furnished with node projection 5, protruding height is about 3mm, shape as shown in the figure, its effect increases the contact area between grid and reinforcing body, with increasing friction force, under the effect preventing grid from applying in external force due to rub deficiency and with the phenomenon of reinforcing body generation relatively sliding.
Example 1: the preparation of high-strength and high-conductivity geotechnique sound of laughing grid
The subgrade and pavement that geo-grid can be used for motorway, airport, parking lot etc. strengthens, and its traffic flow and load are all very large, therefore has higher requirement to the intensity of grid and toughness.In order to prepare the grid of high-intensity high-tenacity, get 70g carbon nanotube, 140g superconduction carbon black, 200g nm-class active calcium carbonate and 10g titanate coupling agent, the quality of high density polyethylene(HDPE) is 580g.Carbon nanotube, superconduction carbon black and nm-class active calcium carbonate dry in baking oven respectively and dry for one hour at 80 ~ 100 DEG C; Titanate coupling agent and nm-class active calcium carbonate Homogeneous phase mixing subsequently; By polyethylene, carbon nanotube, superconduction carbon black and the coupling agent mixed and nm-class active calcium carbonate Homogeneous phase mixing by twin screw extruder melt pelletization at 160 ~ 210 DEG C of temperature, finally mechanics test specimen is made in melting on injection moulding machine again.Through the test to the tension test of mechanics test specimen, obtain its tensile strength and reach 25.68MPa.
Example 2: the application of sensing grid in engineering of high strength, high frictional resistance
Geo-grid in road and construction work can soil mass consolidation, prevent the generation of non-uniform settling, for preparing sensing type geo-grid, the content of carbon nanotube and carbon black is selected to be respectively 6% and 12%, nm-class active calcium carbonate is containing measuring 20%, coupling agent is 5% of nm-class active calcium carbonate content, high density polyethylene(HDPE) matrix content is 61%, and the making step of grid is as identical in example 1.Measure through shop experiment, its tensile strength reaches 22.51MPa, and its normalized resistance rate and strain stress relation formula are: wherein: Ω 0resistance when representing grid initial resistance and tensile deformation respectively with Ω, ε is grid strain.Normalized resistance rate with the variation relation matched curve strained as shown in Figure 4.In Practical Project, by the change of test grid resistance under strained condition, can carry out judging comparatively accurately timely to its deformation, reduce the cost of detection, ensure that the safe reliability of engineering.
To the above-mentioned explanation of the disclosed embodiments, professional and technical personnel in the field are realized or uses the utility model.To be apparent for those skilled in the art to the multiple amendment of embodiment, General Principle as defined herein can when not departing from spirit or scope of the present utility model, realize in other embodiments, the part be not described in detail, for prior art, do not repeat at this.Therefore, the utility model can not be restricted to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and feature.

Claims (10)

1. a sensing type geo-grid structure, is characterized in that: comprise the main rib and auxiliary rib that are made up of the polymkeric substance that with the addition of conductive filler material, described main rib is connected at node place with auxiliary rib, and the diameter of described main rib is greater than the diameter of described auxiliary rib; According to the relation between described polymer resistive and distortion, by measuring the resistance value of described polymkeric substance, obtain the deformation values of geo-grid structure.
2. a kind of sensing type geo-grid structure according to claim 1, is characterized in that: described main rib is longitudinally arranged in parallel.
3. a kind of sensing type geo-grid structure according to claim 2, is characterized in that: described main rib is provided with continuous print projection.
4. a kind of sensing type geo-grid structure according to claim 3, is characterized in that: described projection is arranged along the surperficial broken-line type of described main rib.
5. a kind of sensing type geo-grid structure according to claim 3, is characterized in that: described projection is that undaform is arranged along the surface of described main rib.
6. a kind of sensing type geo-grid structure according to claim 1, is characterized in that: described node is provided with node projection.
7. a kind of sensing type geo-grid structure according to claim 6, is characterized in that: described node projection is arranged along the diagonal lines line style of described node.
8. a kind of sensing type geo-grid structure according to claim 3 or 6, is characterized in that: the height of described projection and node projection is 2-4mm.
9. a kind of sensing type geo-grid structure according to claim 1, is characterized in that: described auxiliary rib diagonally with described main rib cross connection.
10. a kind of sensing type geo-grid structure according to claim 1, is characterized in that: described auxiliary rib is connected with described auxiliary rib is vertical.
CN201520933679.XU 2015-11-20 2015-11-20 Sensing type geogrid structure Expired - Fee Related CN205115355U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108285569A (en) * 2018-03-16 2018-07-17 山东大学 A kind of build-in type is from perception TGXG structure and method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108285569A (en) * 2018-03-16 2018-07-17 山东大学 A kind of build-in type is from perception TGXG structure and method
CN108285569B (en) * 2018-03-16 2024-06-25 山东大学 Built-in self-sensing geogrid structure and method

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Granted publication date: 20160330

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