CN102995619A - Highly smart LDTG composite geotechnical material and engineering monitoring system thereof - Google Patents
Highly smart LDTG composite geotechnical material and engineering monitoring system thereof Download PDFInfo
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Abstract
The invention discloses a highly smart LDTG composite geotechnical material and an engineering monitoring system thereof. The material and the system are characterized in that the composite geotechnical material comprises interlaced fiber bundles of a basis material, and at least one optical fiber is attached onto or to the inside of or to the surface layer of the fiber bundles along the extending direction of the fiber bundles which interlace in at least two different directions to form the biaxial or multiaxial composite geotechnical material. During engineering monitoring, a grating scanner is connected with the optical fiber in the composite geotechnical material, a computer with a data analyzing program and software is connected with the grating scanner, a caution curve of a collapse part is obtained after the processing of the data analyzing program and software of the computer, therefore processing and repair can be performed timely, and accidents are avoided.
Description
Technical field
The present invention relates to a kind of earth working material, be mainly used in reinforcement or reinforcement material in the geotechnical engineering, and can realize detecting the interior force environment variation of soil, and predict in advance the unfailing performance of workmanship, be specially a kind of high intelligent LDTG composite earthwork material and engineering monitoring system thereof.
Background technology
At present domestic soil body reinforcement or reinforcement material (being referred to as geosynthetics) for the geotechnical engineering construction is various in style, its functional performance characteristics, and conforming, each is variant.As: Unidirectional stretched plastic geogrid, Multidirectional stretching plastic geogrid, Three-direction stretching Plastics Geogrids, Multidirectional stretching plastic geogrid, steel are moulded compound geogrid, glass fiber through compiling grid, polyester fiber through compiling grid, superhigh molecular weight polyethylene fibers through compiling grid, carbon fiber knit grid cloth etc.
The ubiquitous technical performance of above-mentioned existing product and functional defect are as follows:
1. the plastic tensile class grid physics, the chemical property that are subject to raw materials for plastics production affects and makes its strength decreased, and elongation at break is high 〉=and 10%; Creep-resistant property is poor, and thermal stability is poor, easily causes engineering cracks and fracture, causes project failure, causes damage.
2. to mould the used reinforcement material of compound geogrid be carbon spring steel wires (GB4357-89) to steel, although intensity is large, but be vulnerable to the corrosion of the adverse circumstances such as acid, alkali, salt, especially for deep ocean work, bank strengthening, because being subjected to for a long time the seawater erosion to cause intensity low, poor corrosion resistance has shortened application life, therefore, can not satisfy the permanent work construction demand fully.
3. fiber-like is through compiling grid, has preferably creep-resistant property, can resist all kinds of physical abrasion and chemical attack, can also resist bioerosion and adverse circumstances changes, guarantee that its performance is unaffected, when up till now the product range of application was more wide, by original highway, railway, dykes and dams, airport earth working material, be extended to Aero-Space, military field.
In sum, along with the energetically support of country to new material industry, research and development new function material, advanced configuration material and composite material are extremely urgent, the subsiding suddenly of road surface, CRACKING ACCIDENT, caused safely serious threat for human traffic trip, the human casualty accident frequent occurrence brings about great losses to national wealth.
Summary of the invention
The present invention is directed to above problem, a kind of high intelligent LDTG composite earthwork material is provided, the present invention is implanted to optical fiber in the matrix material, parameter by non-contact measurement of optical fiber changes the environmental change that detects in the soil, analyze and judge whether this project quality reaches Security Target, and can set according to demand and analyze and caution system, realize omnidistance Real Time Monitoring, thereby avoid the generation of major accident, reduce casualty accident.
For achieving the above object, the present invention adopts following technological means:
A kind of high intelligent LDTG composite earthwork material comprises the geo-grid body, and with at least one optical fiber, it is signal connection end that optical fiber is positioned at this external end of geo-grid on the geo-grid body.
Further, described optical fiber is provided with many and stick on the geo-grid body side by side.
Further, described optical fiber and each bar rod not conllinear or described optical fiber along at least one party of geo-grid body to bar rod bearing of trend extend.
Further, described optical fiber pastes on bar rod surface.
Further, described rod is the matrix material fiber bundle, and optical fiber is wrapped in fiber surface or inside.
Further, described optical fiber bearing of trend is parallel with the volume length direction of geo-grid body.
Further, the composite earthwork material includes the matrix material fiber bundle of at least two different directions, and fiber bundle forms joint at intersection point.
Further, described fiber bundle overlaps at joint.
Further, earth working material comprises the fiber bundle of the matrix material of horizontal and vertical extension, the horizontal and vertical matrix material formation joint that interweaves.
Further, earth working material comprises the matrix material fiber bundle that three different directions extend and mutually cross: along the horizontal substrate material fiber bundle of volume length direction extension, and being positioned at it two oblique substrate material fiber bundles of oblique of horizontal substrate material fiber bundle both sides, transverse base material fiber bundle, oblique matrix material fiber bundle are woven into joint at intersection point.
Further, described each joint is through having transverse base material fiber bundle, oblique matrix material fiber bundle.
Further, earth working material comprises the matrix material fiber bundle that four different directions extend and mutually cross: transverse and longitudinal matrix material fiber bundle, and with transverse and longitudinal substrate material fiber bundle both sides and two oblique substrate material fiber bundles of oblique with it, transverse and longitudinal matrix material fiber bundle, oblique matrix material fiber bundle are woven into joint at intersection point.
Further, horizontal, vertical matrix material fiber bundle is woven into rectangular unit grid, and two oblique matrix material fiber bundles pass through respectively the diagonal of rectangular unit grid.
Further, described joint binding has connecting line.
Further, joint is coated with glue-line at least.
Further, take horizontal substrate material fiber bundle as the basis, in two groups of oblique substrate material fiber bundles: one group becomes 60 ° ± 20 ° with horizontal angle, and another group becomes 120 ° ± 20 ° with horizontal angle.
Further, take horizontal substrate material fiber bundle as the basis, in two groups of oblique substrate material fiber bundles, one group of substrate material fiber bundle with laterally becomes, one group with horizontal angle at 45 ° ± 20 °, another organizes correspondence and laterally becomes 135 ° ± 20 °.
Further, described matrix material is: glass fiber, polyester fiber, aramid fiber, carbon fiber, superhigh molecular weight polyethylene fibers, vinal at least a.
A kind of high intelligent LDTG composite earthwork material engineering monitoring system, it is characterized in that: the composite earthwork material that comprises construction, be connected with raster scanner with the optical fiber in the composite earthwork material, be connected with the computer of analyzing data program and software with raster scanner.
Term: the bar rod among the present invention can be the bar rod that forms behind the whole plastic tensile, also can be the fiber bundle bar rod that multiple matrix material forms.This rod not only is confined to traditional bar-shaped structure, can also comprise flat strip, band shape, so long as the composition band of geo-grid gets final product.
The finished product of geo-grid is web-like, is similar to the toilet paper of web-like, when described volume length direction refers to use along its direction that stretches open, the namely length direction of geo-grid.
Described overlap joint refers to: fiber bundle on the same direction forms a plane or thicker fiber bundle, and overlap joint refers to that between fiber bundle on the different directions and the fiber bundle be not staggered establishment, but the applying of face and face.
Fiber bundle in the invention interweaves at intersection point, can interweave each other for fiber bundle, also can be positioned at separately a plane, also can be above-mentioned two kinds of combinations that interweave.
Operating principle of the present invention and the course of work are as follows:
The present invention has added optical fiber and has formed high Intelligent Composite geosynthetics in the matrix material fiber bundle, high Intelligent Composite geosynthetics is laid in the roadbed, it is the indispensable reinforcement material that the geotechnical engineering reinforcement strengthens, roll under the impact with natural calamity long-term truck on the road surface, cause that roadbed is sudden to subside, at this moment the optical fiber in the high Intelligent Composite geosynthetics is connected with high-strength cable, collect various optical parameters by raster scanner, such as wave-length coverage, the wavelength spacing, because the characteristic of optical fiber and sensing element combination or utilization itself, can make various sensors, gaging pressure, flow, temperature, displacement, gloss and color etc.By after analyzing the processing of data program software and computer, obtain the caution curve at the position that subsides.Thereby in time process and repair, avoid the generation of accident.
This high Intelligent Composite geosynthetics can make two to or multidirectional geosynthetics, satisfy the specific requirement of varying environment.
Optical fiber in the high Intelligent Composite geosynthetics in the roadbed is connected with high-strength cable, through the signal acquisition process of raster scanner, adopts the wireless wave band frequency that is fit to launch by launching tower; Wireless signal is received have fixing monitoring place or mobile workplace by accepting tower again, thus more convenient, monitor quality and the environmental evolution of engineering in time, efficiently, in time take the necessary measures, avoid the generation of major accident.
High intelligent LDTG composite earthwork synthetic materials and engineering monitoring system thereof have just thoroughly solved the functional defect of above-mentioned earth working material, to the reliability of workmanship, have accomplished in advance precognition, avoid the generation that causes a serious accident.
The innovation and creation of high intelligent LDTG composite earthwork synthetic materials and high intelligence engineering real-time monitoring system thereof compared with prior art have the following advantages:
1. used geosynthetics does not also have this function and detection system thereof at present.
2. this material and monitoring system can in time provide the environmental change of engineering inherence, trouble-saving generation.
3. prevention avoids human life to be on the hazard, and reliable safety guarantee is arranged.
4. national wealth is avoided loss.Promoted the harmony of national economy to develop in a healthy way, made the infrastructure of country more benefit the whole mankind.
Description of drawings
In order to be illustrated more clearly in the embodiment of the present application or technical scheme of the prior art, the below will do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art, apparently, the accompanying drawing that the following describes only is some embodiment that put down in writing among the application, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing;
Fig. 1: twin shaft is to full width laying-in, the high Intelligent Composite geosynthetics of inlaid thread composite fibre;
Fig. 2: multiaxis to---three-dimensional full width laying-in, the high Intelligent Composite geosynthetics of inlaid thread composite fibre;
Fig. 3: multiaxis to---four-way full width laying-in, the high Intelligent Composite geosynthetics of inlaid thread composite fibre;
Fig. 4: the application of high Intelligent Composite geosynthetics and automatic monitoring system fundamental diagram;
Fig. 5: the application of high Intelligent Composite geosynthetics and full-time wireless transmission real-time monitoring system schematic diagram.
The specific embodiment
The following correlation technique content of not addressing all can adopt or use for reference prior art.
In order to make those skilled in the art person understand better technical scheme among the application, below in conjunction with the accompanying drawing in the embodiment of the present application, technical scheme in the embodiment of the present application is clearly and completely described, obviously, described embodiment only is the application's part embodiment, rather than whole embodiment.Based on the embodiment among the application, those of ordinary skills are not making the every other embodiment that obtains under the creative work prerequisite, all should belong to the scope of the application's protection.
A kind of high intelligent LDTG composite earthwork material, the simplest way of realization of the present invention can be adhered to optical fiber in existing geo-grid material, the most basic, optical fiber can stick on the geo-grid material, can certainly realize by the technique that glue-line adheres to and ties up.
Above basic implementation, optical fiber arranges as required, such as setting that optical fiber is kept at a certain distance away side by side, optical fiber can extend along the bar rod direction of geo-grid, also can select arbitrarily as required direction and the angle of extending, as long as be tightly adhered on the geo-grid material, satisfy concrete detection demand.
This geotechnological grid material also has following mode: the fiber bundle that comprises the matrix material that interweaves, this matrix material fiber comprises: glass fiber, polyester (PET) fiber, aramid fiber, carbon fiber, superhigh molecular weight polyethylene fibers (UHMWPE), vinal etc. and industry cloth fiber, general designation composite fibre; This matrix material fiber can be for above fiber at least a, also can be the mixture of multiple fiber.
Because the matrix material fiber bundle that adopts is that multifilament forms a pencil, so can be wrapped in matrix material fiber bundle the inside to optical fiber, also can be blended directly in matrix material fiber bundle surface, thereby make to become fibre-optic composite fibre material is arranged.
According to the engineering design strength demand, the line density of composite fibre can be made into every bundle 1000D ~ 40000D, and every bundle composite fibre contains an optical fiber or many optical fibers at least.
According to preparation method and need for environment, this high intelligent LDTG composite earthwork material can work out become twin shaft to or multiaxis to.
So-called twin shaft is to referring to: comprise laterally (radially) and the vertical fiber bundle of the matrix material of (dimension to) extension, the horizontal and vertical matrix material formation joint that interweaves.
Twin shaft is as follows to weave:
Twin shaft needs laying-in composite fibre yarn to full width laying-in, tricot weft insertion machine, inlaid thread composite fibre yarn and the yarn that is connected three systems of binding yarn.Laying-in composite fibre yarn must be placed on the creel, through guidance system tension controller is drawn, adopt the passive type warp let-off, warp run-in is by warp tension control, make it in grid, vertically to stretch arrangement, inlaid thread composite fibre yarn is positioned on the weft yarn frame in the right side of biaxial warp knitting machine or left side, by inlaid thread dolly guiding tractive, at the volley inlaid thread composite fibre yarn lateral extensometer directly is arranged in the grid.
Connect the binding yarn and must through section warping in the warp beam coiled hair, be installed in the workbench front end of biaxial warp knitting machine with the form of segmentation warp beam.Adopt fixed-length positive formula warp let-off machinery, automatic device for measuring length is housed on the coiled hair, can automatically regulate and send yarn length, and make warp let-off length not with the impact of coiled hair vary in diameter, thereby carry out steadily and uniformly sending yarn.Laying-in composite fibre yarn, inlaid thread composite fibre yarn and the yarn that is connected binding yarn three systems are all introduced the knitting point of biaxial warp knitting machine, the motion of loop-forming structure makes and connects the yarn lopping, the crosspoint of laying-in composite fibre yarn and two yarn groups of inlaid thread composite fibre yarn is bundled, thereby be woven into twin shaft to through compiling rectangular mesh.
At twin shaft in the netting lattice, laying-in and separately straight arrangement of inlaid thread, mutually vertical, mutual to interweaving, connection yarn that can be thinner bundlees combination to form firmly node, as shown in Figure 1 with the crosspoint of laying-in composite fibre yarn and inlaid thread composite fibre yarn.
Multiaxis is to can specifically formulating as required, and present embodiment has closely enumerated three axially and the four-axial mode.
Three axial manner:
Comprise the matrix material fiber bundle that three different directions extend and mutually cross: along the horizontal substrate material fiber bundle of volume length direction extension, and being positioned at it two oblique substrate material fiber bundles of oblique of horizontal substrate material fiber bundle both sides, transverse base material fiber bundle, oblique matrix material fiber bundle are woven into joint at intersection point.
Described each joint is through having transverse base material fiber bundle, oblique matrix material fiber bundle, and namely three adjacent fiber bundles form a triangle, and as shown in Figure 2, the triangle head and the tail are staggered.
In the angle of three fiber bundle formation, take horizontal substrate material fiber bundle as the basis, in two groups of oblique substrate material fiber bundles: one group becomes 60 ° ± 20 ° with horizontal angle, preferred 60 °, another group becomes 120 ° ± 20 ° with horizontal angle, preferred 60 °, to guarantee whole hot strength and stressed even reasonability.
The four-axial mode:
Comprise the matrix material fiber bundle that four different directions extend and mutually cross: transverse and longitudinal matrix material fiber bundle, and with transverse and longitudinal substrate material fiber bundle both sides and two oblique substrate material fiber bundles of oblique with it, transverse and longitudinal matrix material fiber bundle, oblique matrix material fiber bundle are woven into joint at intersection point.
Further, horizontal, vertical matrix material fiber bundle is woven into rectangular unit grid, and two oblique matrix material fiber bundles pass through respectively the diagonal of rectangular unit grid, as shown in Figure 3.
In the angle that fiber bundle forms, take horizontal substrate material fiber bundle as the basis, in two groups of oblique substrate material fiber bundles: one group of substrate material fiber bundle with laterally become into, corresponding another organized and laterally become 180-(45 ° ± 20 °), namely form 135 ° ± 20 ° angle, wherein rectangular unit grid is preferably square, and corresponding optimized angle is 45 ° and 135 °.
Above-mentioned fiber bundle can be coated with glue-line, and joint wherein can be coated with separately glue-line, also can bundle connecting line, and the mixing that also can be both connects.
When the skin of high Intelligent Composite geosynthetics applied glue-line, its coating method was as follows:
Establishment become certain fabric width arranged (1m ~ 6m) and the length rolling (grid cloth of 20m ~ 200m), insert the cloth unwinding device, enter front storage cloth mechanism, grid cloth enters in the glue groove that fills coating solution, pull out through glue trench bottom rotation deflector roll bottom surface, after finishing automatic coating, the roll extrusion through two Extruded rollers makes more uniformity of rubberised layer again; Then enter vertical drying kiln, twice of upper and lower circulation is rear in shaft kiln tentatively finishes setting, and design temperature must not be above 90 ℃ in the shaft kiln chamber.
The grid cloth of tentatively setting is entered horizontal tentering heatset drier continuously, and it is comprised of to tension force control, rear storage cloth holder, meter counter, winder, switch board tentering car head unit, track component, cloth clamp and chain, electronic amplitude modulation parts, tailstock parts, drive disk assembly, automatic guide hot oil medium heat exchanger temperature-regulating oven, Hydraulic Station and oil cylinder, anteroposterior diameter.Horizontal its mechanism of stentering forming drier is that product is carried out whole latitude tentering, and its effect is: horizontal (latitude) to, vertical (warp) stretching to the bending of composite fibre yarn serpentine.And can adjust contracting width of cloth phenomenon; Design temperature is no more than 90 ℃ in the flat kiln.
The application of high Intelligent Composite geosynthetics and the operating principle of automatic monitoring system thereof, as shown in Figure 4.
Roll under the impact with natural calamity long-term truck 5 on the road surface, cause roadbed 4 sudden subsiding, at this moment the optical fiber in the high Intelligent Composite geosynthetics 1 is connected with high-strength cable, collect various optical parameters by raster scanner 2, such as wave-length coverage, wavelength spacing, because the characteristic of optical fiber and sensing element combination or utilization itself can be made various sensors, gaging pressure, flow, temperature, displacement, gloss and color etc.By after analyzing data program software and computer 3 processing, obtain the caution curve at the position that subsides.Thereby in time process and repair, avoid the generation of accident.
The difference of the application of high Intelligent Composite geosynthetics shown in Figure 5 and full-time wireless transmission real-time monitoring system and system shown in Figure 4 is: system shown in Figure 5 is by wireless signal transmission, acceptance, operating personnel can be not at the scene the situation, in real time round-the-clockly monitors and analyze.
Shown in Figure 5 is full-time wireless transmission real-time monitoring system: this system can be according to the significance level of road conditions and engineering, set up fixing and long-term monitoring system, its operating principle is: the optical fiber in the high Intelligent Composite geosynthetics 51 in the roadbed is connected with high-strength cable, through the signal acquisition process of raster scanner 52, adopt the wireless wave band frequency that is fit to launch by launching tower 56; Wireless signal is received have fixing monitoring place or mobile workplace by accepting tower 57 again, thereby more convenient, monitor quality and the environmental evolution of engineering in time, efficiently, in time take the necessary measures by computer 53 detections, avoid the generation of major accident.
High intelligent LDTG composite earthwork synthetic materials and the engineering monitoring system thereof of this invention; except using in earth working material, geotechnical engineering geo-grid reinforcement field; also can in the Other Engineering field, use, such as civilian construction, hydraulic engineering; military field; Aero-Space, highway, railway abutment, airport; the fields such as port and pier, similar product of the present invention and system monitoring all are protection scope of the present invention.
The above only is the application's preferred embodiment, makes those skilled in the art can understand or realize the application.Multiple modification to these embodiment will be apparent to one skilled in the art, and General Principle as defined herein can in the situation of the spirit or scope that do not break away from the application, realize in other embodiments.Therefore, the application will can not be restricted to these embodiment shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (19)
1. one kind high intelligent LDTG composite earthwork material is characterized in that: comprise the geo-grid body, with at least one optical fiber, it is signal connection end that optical fiber is positioned at this external end of geo-grid on the geo-grid body.
2. the intelligent LDTG composite earthwork of height according to claim 1 material is characterized in that: described optical fiber is provided with many and stick on the geo-grid body side by side.
3. the intelligent LDTG composite earthwork of height according to claim 2 material is characterized in that: described optical fiber and each bar rod not conllinear or described optical fiber along at least one party of geo-grid body to bar rod bearing of trend extend.
4. the intelligent LDTG composite earthwork of the described height of any one material according to claim 1-3 is characterized in that: described optical fiber pastes on bar rod surface.
5. the intelligent LDTG composite earthwork of the described height of any one material according to claim 1-3, it is characterized in that: described rod is the matrix material fiber bundle, and optical fiber is wrapped in fiber surface or inside.
6. the intelligent LDTG composite earthwork of the described height of any one material according to claim 1-3, it is characterized in that: described optical fiber bearing of trend is parallel with the volume length direction of geo-grid body.
7. the intelligent LDTG composite earthwork of height according to claim 5 material, it is characterized in that: the composite earthwork material includes the matrix material fiber bundle of at least two different directions, and fiber bundle forms joint at intersection point.
8. the intelligent LDTG composite earthwork of height according to claim 7 material, it is characterized in that: described fiber bundle overlaps at joint.
9. the intelligent LDTG composite earthwork of the described height of any one material according to claim 1-3, it is characterized in that: earth working material comprises the fiber bundle of the matrix material of horizontal and vertical extension, the horizontal and vertical matrix material formation joint that interweaves.
10. the intelligent LDTG composite earthwork of height according to claim 7 material, it is characterized in that: earth working material comprises the matrix material fiber bundle that three different directions extend and mutually cross: along the horizontal substrate material fiber bundle of volume length direction extension, and being positioned at it two oblique substrate material fiber bundles of oblique of horizontal substrate material fiber bundle both sides, transverse base material fiber bundle, oblique matrix material fiber bundle are woven into joint at intersection point.
11. the intelligent LDTG composite earthwork of height according to claim 10 material is characterized in that: described each joint is through having transverse base material fiber bundle, oblique matrix material fiber bundle.
12. the intelligent LDTG composite earthwork of height according to claim 9 material, it is characterized in that: earth working material comprises the matrix material fiber bundle that four different directions extend and mutually cross: transverse and longitudinal matrix material fiber bundle, and with transverse and longitudinal substrate material fiber bundle both sides and two oblique substrate material fiber bundles of oblique with it, transverse and longitudinal matrix material fiber bundle, oblique matrix material fiber bundle are woven into joint at intersection point.
13. the intelligent LDTG composite earthwork of height according to claim 12 material is characterized in that: horizontal, vertical matrix material fiber bundle is woven into rectangular unit grid, and two oblique matrix material fiber bundles pass through respectively the diagonal of rectangular unit grid.
14. the intelligent LDTG composite earthwork of height according to claim 8 material is characterized in that: described joint binding has connecting line.
15. the intelligent LDTG composite earthwork of height according to claim 8 material, it is characterized in that: joint is coated with glue-line at least.
16. the intelligent LDTG composite earthwork of height according to claim 11 material, it is characterized in that: take horizontal substrate material fiber bundle as the basis, in two groups of oblique substrate material fiber bundles: one group becomes 60 ° ± 20 ° with horizontal angle, and another group becomes 120 ° ± 20 ° with horizontal angle.
17. the intelligent LDTG composite earthwork of height according to claim 12 material, it is characterized in that: take horizontal substrate material fiber bundle as the basis, in two groups of oblique substrate material fiber bundles, one group of substrate material fiber bundle with laterally become, one group with horizontal angle at 45 ° ± 20 °, corresponding another group becomes 135 ° ± 20 ° with horizontal.
18. the intelligent LDTG composite earthwork of height according to claim 5 material, it is characterized in that: described matrix material is: glass fiber, polyester fiber, aramid fiber, carbon fiber, superhigh molecular weight polyethylene fibers, vinal at least a.
19. one kind high intelligent LDTG composite earthwork material engineering monitoring system, it is characterized in that: the composite earthwork material that comprises construction, be connected with raster scanner with the optical fiber in the composite earthwork material, be connected with the computer of analyzing data program and software with raster scanner.
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| CN104448883A (en) * | 2014-12-13 | 2015-03-25 | 广西科技大学 | New formula of smart carbon fiber plate |
| CN104476831A (en) * | 2014-12-12 | 2015-04-01 | 广西科技大学 | Intelligent carbon fiber composite board |
| CN106500867A (en) * | 2016-10-26 | 2017-03-15 | 上海市政工程设计研究总院（集团）有限公司 | The installation method of dykes and dams monitoring internal temperature system |
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| CN112781446A (en) * | 2020-12-29 | 2021-05-11 | 中北大学 | Intelligent protective armor with damage feedback function and preparation method thereof |
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| CN103469782B (en) * | 2013-09-23 | 2015-11-18 | 浩珂科技有限公司 | The preparation method of fiber grating compound dacron geogrid |
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