Geogrid or mesh structure for soil surface reinforcing
FIELD: fixed constructions; reinforcing of the soil surface of road slopes and shore lines, protection of mainline pipelines against soil erosion using geogrids.
SUBSTANCE: geogrid comprises set of flexible tapes made of a woofed structure material that are set on edge and attached one to another with seams to form a meshed structure when the grid in set position. The tapes are made of a material having a woofed structure formed of 150 to 300 polypropylene threads in warp direction and of polypropylene fibrillated or multifilament threads in weft direction, and having a breaking force not less than 100 kN/m. The used seams are shuttle-type seams with bar tacks. The length of the geogrid in its set position is from 10 to 20 m, the width is up to 10 m, and the height - from 50 to 150 mm. The geogrid mesh sides are from 50 to 500 mm in its set position in longwise and crosswise directions. The thickness of flexible woofed tape is from 1.0 to 2.0 mm. The seams are stitched vertically in relation to the flexible edges with twisted sewing threads, made of polyether or polyamide or other synthetic threads with a breaking load not less than 60 N, ensuring a minimal breaking load of the seam not less than 50% of the tape breaking load of the tapes.
EFFECT: enhancement of the geogrid performance characteristics; ultraviolet rays resistance of the material; biological stability; environmental security; maintaining stable characteristics to allow using the geogrid at all times and at all temperatures.
4 cl, 4 dwg, 1 tbl
The invention relates to the construction, namely the strengthening of the soil surface slopes of roads and Railways, coastlines, protection of pipelines from soil erosion, to increase the carrying capacity of the roadway, etc.
Known geogrid with cellular structure to strengthen the soil surface, made of flexible strips that are installed on the edges and interconnected in a staggered seams with education in an extended, working position of the honeycomb structure (see U.S. patent No. 4797026, CL E02D 17/20, 1989).
Known geogrid with cellular structure made of flexible strips connected by joints so that when stretched, they form three-dimensional structures (see RF patent №2166625, E02D 17/20, EV 3/12, E01C 5/00 from 27.04.2001,).
The closest to the essence and the achieved result to the invention, the technical solution is the geogrid with cellular structure, made from a variety of flexible strips of textile material structure, set on edge and interconnected by joints with education in the working position of the honeycomb structure (see RF patent №2180030, E02D 17/20 from 10.09.1999 year).
However, the known technical solutions have the following disadvantages: low strength of the lattice due to the low cutoff characteristics of flexible strips, when laying Tr which require more effort because of the rigid connection of the strips, what temperatures can cause damage, lack of permeability, which contributes to the leaching of soil from cells, a significant proportion of the transport volume to the desktop.
Task to be solved by the present invention is directed, is the performance of the geogrid by increasing the cutoff characteristics of the flexible strips, the most loaded element - seam resistance of the material to ultraviolet radiation, biological durability, environmental, safety, long-term work with stable performance with geogrid at any time of the year at various temperatures, and ensure good filtration capacity. Put the problem is solved due to the fact that the geogrid with cellular structure, made of a set of flexible bands with textile material structure, set on edge and interconnected by joints with education in the working position of the honeycomb structure, the flexible strip is made of a material with a woven structure formed from 150 to 300 polypropylene yarns in the warp and polypropylene fibrillated or multi-filament threads on a duck, and have a tensile strength of not less than 100 kN/m, and the seams are arranged vertically with respect to the edges of the flexible strips and the Shuttle made with implementing the Oh of woven synthetic sewing yarn with a breaking load of not less than 60 N, providing a minimum breaking load of the weld is not less than 50% of the breaking load of the flexible strips.
In addition, the length of the geogrid in the working position can be from 10 to 20 m, width 10 m and a height of from 50 to 150 mm; the cell size of the geogrid in the working position can be in the longitudinal and transverse directions from 50 to 500 mm; the thickness of the flexible woven stripes can vary from 1.0 to 2.0 mm
Polypropylene in its structure an inert material, under normal operating temperatures from -50 to +50° does not interact with any chemical or biological material that ensures environmental safety of the geogrid.
Flexible strip of woven material for geogrids are manufactured at the ribbon-weaving machines by filling the basis of from 150 to 300 filaments, such as polypropylene, and in the duck is applied fibrillated polypropylene or multifilament thread size up to 1500 denier. Edge of the flexible strip strengthened by powazki filling and banding thread that even when the local violation of the integrity of the territory, does not bloom threads flexible strip further.
Made flexible strip is a woven material of white or any other color, width from 50 to 150 mm, a thickness of 1 to 2 mm, It provides a flexible strip of material with a woven structure gap is th load of not less than 100 kN/m Data cutoff characteristics of the geogrid are achieved due to the fact that when filling the basis of the woven material of the flexible strip large a certain number of threads (from 150 to 300) on a relatively small width of the flexible strip (from 50 to 150 mm), the effect of the rope and it also provides sufficient transverse stiffness (modulus of elasticity) of the flexible strip. Data cutoff characteristics of the geogrid is essential in use on the slopes above 30° and a height of 5 m, as the weight of bulk soil or other material is poured into the cells of the geogrid, especially after saturation moisture on the contact bulk soil and the Foundation should be provided with the balance shifting and holding force.
According to the calculations MSCU for embankment height 5 m required tensile strength of the geogrid as reinforcement material, tensile must be 77 kN/m in a single-layer reinforcement. The time of consolidation of the soil is 1.5 years, i.e. reinforcing geogrid within the specified period must have a constant strength of not less than 77 kN/m (see Shcherbina E.V. Geosynthetic materials in construction. DIA, M., 2004, p.54).
Conducted experiments have shown that, compared with known geogrids, only the proposed geogrid due to the woven structure of the flexible strips with certain kolichestvennie satisfies these requirements, providing a breaking load of 100 kN/m
Having woven material structure made of polypropylene yarn, flexible strip of geogrid freely passes the water permeability of not less than 70 m3/day and does not prevent the penetration of the root system of turf. Polypropylene filaments woven fabric flexible strip proposed geogrid due to the vitreous surface is not affected kalatali, unlike threads flexible strip of non-woven materials that are fibrous in structure.
The connection of the flexible strips to obtain the geogrid is made with seams located vertically with respect to the edges of the flexible strips, special sewing machines with reversing course twisted sewing thread made of polyester or polyamide or other synthetic yarn with a breaking load of not less than 60 N, which provides the minimum breaking load of the weld is not less than 50% of the breaking load of the flexible strips. Unlike flexible strips of geogrid of the finished nonwoven material, woven material strip when sewing needle of the sewing machine extends thread and, as the threads are not interconnected rigidly, weakening the strip in place of protiva does not occur. In the case of stapling flexible strips of nonwoven needle cuts through the strip material, which leads to knowledge is sustained fashion to reduce the disruptive characteristics of the bands in place of protiva. The invention is illustrated by drawings, where:
figure 1 - the geogrid in the folded state,
figure 2 - geogrid working in the extended position,
figure 3 - cell of the geogrid with the notation of dimensions,
figure 4 - view 1 figure 3 (scheme weld at the junction of the flexible strips and threads of a woven structure of the material strips of geogrid).
Geogrid 1 consists of a set of interconnected cross stitch lockstitch seam with tack 2, flexible strips 3 of a material with a woven structure formed by the threads 4 bases and 5 threads duck and having longitudinal ribs 6. Cell 7 of the geogrid in the stretched condition figure 3 have the shape of a hexagon with the size of F in the transverse and longitudinal direction 50 of 500 mm and a length (L) of the area between the seams of up to 200 mm
The geogrid in the stretched condition in figure 2 has the following dimensions:
A - length of the geogrid from 10 to 20 m;
In - the width of the geogrid to 10 m;
H - the height of the geogrid from 0.05 to 0.15 m
The geogrid in the stretched state (with dimensions: length 10 m and a width of 8.7 m) has an area of 87 m2and weight up to 35 kg
In the folded position geogrid is a module of rectangular form, convenient for transportation.
The ratio of the volume of the transport position of the geogrid in the form of a module to the extended (working) position 1:130, which is very beneficial if transportirovki the geogrids to the point of use.
Characteristics of the proposed geogrid compared with similar production characteristics of geogrids, obtained as a result of the tests shown in the table.
|Characteristics of the geogrid||The polymer geogrid strips||Geogrid with woven stripes||Geogrid woven strips of polypropylene filaments|
|The breaking load of bands, kN/m||40||20||100|
|Chemical and biological stability, the year||unlimited||2||unlimited|
|Filtration capacity, m3/d||0||40||70|
|The area of the module, m2||14,8||83||87|
|Flexibility on the beam with a radius of 5 mm at t minus 40°||does not stand||violation of patterns of material none||violation of patterns of material none|
|The ratio of the volume of the unit in the folded and extended status||1/54||1/55||1/130|
The tests proposed geogrid showed pickup is usesto its characteristics over known that you can use as a reliable reinforcing means for reinforcing slopes, road bases, surface protection of slopes over the pipeline systems, plugging lakoocha mining industry and other geotechnical features.
The geogrid has a low intensity, strength tapes 100 kN per 1 m and the strength of joints not less than 50 kN/m, and provides reliable protection of soil from erosion and filtering of water down the slope.
The proposed geogrid allows to increase the carrying capacity of the roadway if it be laid in the base of the road or asphalt coating due to the redistribution of loads from the vehicle evenly across the base of the road.
High stability of the fill geogrid soil to the action of wind and water erosion due to the implementation of flexible strips woven structure of the material obtained from polypropylene filaments. Which also contributes to the natural sprouting roots grass for additional securing of the soil in the cell of the geogrid.
1. Geogrid with cellular structure to strengthen the soil surface, containing a variety of flexible strips of textile material structure, set on edge and interconnected by joints with the formation of working in the position of the honeycomb structure, characterized in that the flexible strip is made of a material with a woven structure formed from 150 to 300 polypropylene yarns in the warp and polypropylene fibrillated or multi-filament threads on a duck, and have a tensile strength of not less than 100 kN/m, and the seams are arranged vertically with respect to the edges of the flexible strips and made the Shuttle with the tack of woven garment synthetic yarn with a breaking load of not less than 60 N, providing a minimum breaking load of the weld is not less than 50% of the breaking load of the flexible strips.
2. The geogrid to claim 1, characterized in that the length of the geogrid in the working position is from 10 to 20 m, width 10 m and a height of from 50 to 150 mm
3. The geogrid according to claim 1, characterized in that the cell size of the geogrid in the working position are in longitudinal and transverse directions from 50 to 500 mm
4. The geogrid according to claim 1, characterized in that the thickness of the flexible strip is from 1 to 2 mm.
FIELD: construction, particularly ground consolidation during road building on bases formed of structurally unstable grounds, for road, pit slope, river bank and hydraulic structure consolidation and so on.
SUBSTANCE: in both variants band is made of polymeric material and has cuts uniformly distributed at spaced apart locations along band length. The cuts are transversal to longer band edge. Each cut has depth equal to half of band width bs±5%. Cut width is not less than band thickness. In the first variant another band half has depressions opposite to each cut. Each depression has depth hd=(0.1÷0.2)bs. Distance between extreme cuts and shorter band edge is equal to 0.2÷1.0 m. In the second variant orifices are formed from both sides of each cut and are located close to cut and to band edge. Two orifices are made opposite to said orifices and located near opposite band edge so that distance between extreme cuts and shorter band edge is equal to 0.2÷1.0 m. In both variants three-dimensional frame includes longitudinal and transversal polymeric bands, which define quadrangular, preferably rectangular, cells. Spacing between cut centers in longitudinal band is equal to or differs from that of transversal bands. Longitudinal bands are laid so that cuts face upwards and receive transversal bands, which are inserted in longitudinal ones so that their cuts face downwards and create joints. In the first variant three-dimensional frame comprises bands, which are made in accordance with the first band production variant. Polymeric strips are placed in longitudinal band depressions and are connected to transversal bands. Transversal band depressions receive polymeric strips fastened to longitudinal bands. In the second frame production variant band made in accordance with the second variant is used. Fastening members, which pivotally connect longitudinal and transversal bands with each other, are located in orifices made in upper three-dimensional frame part, namely in ones created in transversal and longitudinal bands near cuts of longitudinal bands, as well as in orifices made in lower three-dimensional frame part, namely in ones formed in transversal and longitudinal bands near transversal band cuts.
EFFECT: increased tensile strength of the band and decreased material consumption.
10 cl, 8 dwg
FIELD: construction and welding, particularly to produce ground consolidation grid having cellular structure with the use of ultrasonic thermoplastic polymeric material welding.
SUBSTANCE: method involves connecting thermoplastic polymeric material strips with linear weld seams arranged in staggered order by ultrasonic welding, wherein ultrasonic action is applied on 22-24 kHz working frequency with oscillation amplitude not less than 30 μm with the use of piezoelectric oscillation system having end with working blade; continuously controlling electric piezoelectric oscillation system parameters to set optimal ultrasonic welding duration on the base of said parameter change. To create staggered weld seams strips are serially laid on two independent stepped supports having reversible weld backing plates in seam creation areas. Then weld seams are formed to connect the first two strips. After the first two strips connection lower support is placed on upper strip surface, the next strip is laid on the support and weld seams are made between the third and the second strips. After weld seam forming in two following strips the support is placed on welded strip surface and the next strip is laid thereon to connect predetermined number of strips with each other.
EFFECT: elimination of prior art defects, possibility to avoid simultaneous connection of more than two strips with welding parameter control, provision of staggered weld seam pattern and increased weld connection strength.
FIELD: environmental protection of territories, particularly to protect slopes and other objects against erosion.
SUBSTANCE: method involves covering slope with mesh grid to be unreeled from roll so that mesh grid cut edges are overlapped and connected with each other with the use of tie wire in overlapped zones; securing the formed mesh grid mat to slope with anchors. Before mesh grid fixation plant seeds are spread over slope ground. The plant seeds are covered with straw mat layer having thickness of 3-7 cm in water stream flow direction. Straw mats are overlapped so that upper straw mats cover 10-20 cm of lower ones to prevent water stream penetration therethrough.
EFFECT: increased capacity, efficiency and reliability, as well as extended service life.
FIELD: road building, particularly to reconstruct, repair road embankment and landslide control of slopes during road usage.
SUBSTANCE: slope consolidation device comprises transversal culvert arranged in embankment body and provided with water-intake means, as well as head fixedly connected to culvert and embedded in embankment body. Culvert is jointless and is formed of high-strength material, for instance of steel pipe. One pipe end has water-intake means and is plugged with conical cap. Conical cap base has diameter exceeding that of culvert and arranged in water-saturated embankment body zone. Another pipe end extending at drain angle projects from embankment and rigidly connected with head. The head is made as anchoring member.
EFFECT: enhanced embankment slope stability, increased operational efficiency and reliability due to improved water drainage from water-saturated embankment body zones along with increased load-bearing and anchoring abilities of device components by re-distribution of active ground load applied to the components.
3 cl, 3 dwg
FIELD: means for securing of slopes or inclines, particularly ground consolidation netting.
SUBSTANCE: plastic netting comprises oriented strips 6, 9, which form triangular cells so that strips are connected with each other in connection points 11. Six strips 6, 9 converge at each connection point 11. Plastic source material has orifices defining hexagon grid array so that opposite orifices of each hexagon are aligned in processing direction. Source material is preliminarily expanded in processing direction and in transversal direction. Ready ground consolidation netting 10 has hexagon centers, which create connection points 11. Connection point 11 centers are slightly biaxially oriented, but edge of each strip 6, 9 extends about corresponding connection point 11 edge and passes into next strip 6, 9 edge at connection point 11 edges. During the second expanding operation retaining force may be applied in the first direction and released before provision of material relaxing in the second expanding direction.
EFFECT: increased efficiency, possibility to create netting of source material having through orifices and weakened zones.
44 cl, 17 dwg, 3 ex
FIELD: hydraulic, industrial and civil building, as well as transport, particularly securing of slopes or inclines.
SUBSTANCE: method involves surveying slope ground with the use of light-weight probe; determining physical-and-mechanical properties and depth of sliding ground surface location with the use of reference mark system constituted of drive members and compacting slope ground by means of drive members with the use of driving device made as annular hammer. The annular hammer is produced as a single unit and has radial through threaded orifice to receive retaining bolt and striker. The striker is made as two symmetric rigid plates having orifices for bolts with nuts. Depressions for bolt heads are created in outer surface of one rigid symmetric plate.
EFFECT: increased reliability and decreased labor inputs for geological engineering survey of slope.
19 cl, 8 dwg
FIELD: mining, particularly to consolidate or to protect pit sides against landslide during pit operation.
SUBSTANCE: method involves laying transversal members connected to ropes along slope, wherein the ropes are fixedly secured to anchors located in upper bench berm; drilling inclined wells extending to bench slope; installing next anchor along lower edge of upper berm and drilling next inclined well cluster. Suspending net to bench slope and pulling down ropes from upper berm through drilled inclined wells so that the first rope ends extend from bench slope; lowering the rope ends to lower berm and securing thereof to transversal members arranged above the net, wherein the transversal members are installed beginning from lower berm; tightening the ropes and fastening the second rope ends to anchors.
EFFECT: increased operational safety and decreased labor inputs for bench slope consolidation.
1 ex, 2 dwg
FIELD: building, particularly to reinforce landslide slopes, particularly extensive landslides.
SUBSTANCE: landslide control structure comprises bored piles fixed in stable slope ground layers and retained by anchoring means. To provide stability of lower landslide part inclined bars of anchor means are connected to bored pile heads. The anchor means are drilled down the slope and have fan-like structure. The anchor means are located at different levels in landslide body.
EFFECT: reduced labor inputs and material consumption for landslide control structure erection and increased stability of landslide massif.
2 cl, 2 dwg
FIELD: building, particularly to stabilize slope landslides.
SUBSTANCE: landslide control structure comprises vertical walls built in base formed under the landslide and located along the landslide so that distance between adjacent walls decreases towards lower landslide end. Vertical walls are made of pile rows defining pleat-like system having pitch preventing ground punching between the piles. The pleats are directed so that corner apexes thereof face sliding ground and grillages of adjacent pleat flanges are connected by transversal beams.
EFFECT: increased load-bearing capacity and increased technological efficiency of structure erection.
FIELD: agriculture, particularly steep slope terracing to adapt the slope for fruit trees and other crops growth.
SUBSTANCE: method for terracing slopes having steepness equal to or exceeding natural soil slip angle involves forming step-shaped ledges having depressions; scattering soil excavated from the slope over the ledges; stabilizing the soil with reusable rectangular netted retaining walls. The retaining wall has frame-like wall base created of welded angular or channel bars or bars of another cross-section. The wall bases are installed on the slope along lower ledge bounds and inclined at 60° angle with respect to horizon line. The wall bases are fixed by support and bearing wedges for a time equal to soil conglomeration time, wherein liquid or granular fertilizer is preliminarily introduced in soil and soil is laid down with perennial grass before ledge hardening.
EFFECT: increased slope use factor.
FIELD: transport engineering; seat belts.
SUBSTANCE: design peculiarity of strap is that it contains first group of warp treads 1 and second group of warp threads 2, warp threads 1 of first group are more extensible than those of warp threads 2 second group, and warp threads 3 of third group are included into warp threads 2 of second group. Warp threads 3 of third group contains electric conducting means 4.
EFFECT: increased strength of strap.
10 cl, 3 dwg
FIELD: fabric used in aircraft industry for manufacture of wing and tail covering of plane.
SUBSTANCE: fabric is produced from warp and weft polyester complex filaments having similar linear density ranging between 27.7-29.4 tex and twist rate of 130-160 twists/min. Warp to weft filament ratio of fabric is 55-50:45-50. Fabric is produced by twill weave and is not subjected to final finishing procedure.
EFFECT: provision for stretching of covering owing to thermal shrinkage of proposed fabric structure, reduced weight, and prolonged service life of fabric.
3 cl, 1 tbl, 7 ex
FIELD: light industry, in particular, elastic fusible interlining material based on woven fabric and adapted for doubling of cutting parts for sewing articles.
SUBSTANCE: woven fabric for fusible interlining material is made from textured polyester threads of crepe weave with linear warp and weft density of 10-24 tex and fabric thread density of 12-24 threads/cm. Fusible interlining covering is made in the form of chaotically arranged glue dots having diameter of up to 1 mm and dot spacing of up to 3 mm. Surface density of fusible covering is 13-17 g/m2.
EFFECT: improved operating characteristics of interlining material.
2 dwg, 1 tbl, 4 ex
FIELD: textile industry.
SUBSTANCE: invention provides fireproofing textile for use when sewing special technical clothing for workers of Emergency Control Ministry, Ministry of defense, and other force structures in order to protect workers working at enterprises including high-temperature objects, elevated heat emission, molten metal scrap containing objects, hot shops, and the like. Fireproofing textile contains staple yarn within warp and weft, said staple yarn incorporating aromatic terpolymer-based staple filaments mixed with natural and artificial fibers. Fabric is manufactured using derived, combined, and composed weaves. As natural fibers, cotton, linen, and woolen fibers are used and, as artificial, fireproofing viscose fibers.
EFFECT: improved performance characteristics of fabric, expanded assortment possibilities and resource of raw materials.
6 cl, 6 dwg, 1 tbl, 6 ex
FIELD: manufacture of cloths provided with at least one fold or formed as zigzag put folds.
SUBSTANCE: cloth provided with at least one permanent fold comprises shrinkable material fixed in direction within at least one fold formation zone. Said material is shrunk as a result of processing in direction diagonal to above direction. Method allows cloth to be manufactured, which comprises one or more folds, and also cloth formed as zigzag put folds.
EFFECT: wider range of cloths manufactured by said method.
18 cl, 8 dwg
FIELD: textile industry, in particular, manufacture of special medical and rehabilitation articles, for example, physiotherapeutic mats, plaids and clothing parts contacting directly with human body.
SUBSTANCE: antistatic fabric contains systems of warp threads defining background layer and weft threads, said threads being based on chemical and/or natural filaments, and current conductive netted material defined by complex current conductive polymer threads of enclosure-core structure, with fabric warp and weft repeat pattern containing from 10 to 24 threads, including single complex current conductive polymer threads in an amount of from 1 to 12 filaments. Complex current conductive polymer threads of enclosure-core structure are made on the basis of capron filaments covered with continuous current conductive composition based on copolymer of tetrafluoroethylene and vinylidene fluoride, filled with technical carbon at weight ratio of from 1:0.6 to 1:0.8, with total linear density of complex current conductive polymer filament making 52-58 tex.
EFFECT: enhanced antistatic properties of fabric by eliminating the possibility of accumulation of static electricity on surface of article manufactured from said fabric and contacting directly with human body.
2 cl, 5 dwg
FIELD: industrial fabric used in pulp-and-paper industry and associated branches of industry.
SUBSTANCE: industrial fabric comprises threads extending in the course of advancement of paper in machine, and threads extending traverse to course of advancement of paper in machine, said threads being interwoven so as to form woven structure. At least some of threads extending in the course of advancement of paper in machine and/or threads extending traverse to course of advancement of paper are threads having core filament surrounded with enclosure. Core filament and enclosure may be visually distinguished from one another by unaided eye, for example by color, so that wear of industrial fabric surface may be visually controlled during its service life on the basis of changing which is distinguished upon wearing and losses of enclosure from core filament.
EFFECT: provision for controlling wear of fabric in any point on its inner and outer surfaces.
FIELD: woven materials for magnetic systems and electromagnetic radiation shields.
SUBSTANCE: proposed magnetically soft fabric used as magnetically soft material has mixture of powdered alloy of falsifier with grain size of 5 to 10 μm and magnetically soft Mn-Zn-ferrite with grain size of 50 to 100 μm , and binding polymer. Fabric warp is made of lavsan using textile technology; proportion of ingredients is as follows, mass percent: lavsan threads, 30-20; binding polymer, 15-20; magnetically soft ferrite powder, 30-50.
EFFECT: ability of shielding external superhigh-frequency electromagnetic radiation in ferromagnetic resonance mode.
1 cl, 1 tbl, 3 ex
FIELD: woven fabrics for magnetic systems, radioactive radiation shields, biologic process stimulation in living organisms.
SUBSTANCE: proposed highly coercive fabric is, essentially, reticular structure of linen weave of polyamide warp threads and shoot wires, and combination of acrylic copolymers and highly coercive neodymium-iron-boron alloy powder; linear density of warp threads and shoot wires is 20 to 100 tex, and their quantity per meter is 1 500 to 6 500, proportion of ingredients being as follows, mass percent: polyamide threads, 10-50; acrylic copolymers, 15-25, highly coercive neodymium-iron-boron alloy powder, 65-35.
EFFECT: enhanced flexibility and ergonomic efficiency, facilitated manufacture.
1 cl, 1 tbl, 3 ex
FIELD: woven fabrics for magnetic systems and radioactive radiation shields.
SUBSTANCE: proposed ferromagnetic fabric characterized in enhanced strength and magnetic characteristics, ability of absorbing and dissipating electromagnetic radiation has warp, polymeric binder, and powdered ferromagnetic material. Fabric warp is made by linen weave method. Warp threads and shoot wires are made of alternating lavsan and magnetically soft single threads. Number of threads per meter is 5 000 to 7 000. Magnetically soft threads are made either of supermalloy or molybdenum permalloy with diameter measuring 0.05 to 0.1 mm; linear density of lavsan threads is 10 to 20 tex. Proportion of fabric ingredients is as follows, mass percent: lavsan thread, 10-15; magnetically soft single threads, 20-25; binder (acrylic copolymers), 10-15; highly coercive alloy powder, 50-55.
EFFECT: enhanced radioactive radiation shielding efficiency of fabric.
1 cl, 1 tbl, 1 ex
FIELD: roadway covering.
SUBSTANCE: proposed reinforcing screen includes crossing strands (1, 2 or 1', 2' or 1", 2")made from synthetic material at elongation at rupture of 5-6% lying consequently in range of elongation at rupture of bitumen-containing roadway covering. Screen may be coated with agent enhancing adhesion which has affinity for bitumen; it may be also bonded with bearing layer, i.e. with bitumen-impregnated non-woven base 4. Such screen is able to take up forces arising in bitumen covering and to become elastically deformable within range of its elongation.
EFFECT: enhanced efficiency and reliability.
8 cl, 7 dwg, 1 ex