CN201567554U

CN201567554U - Low-heat-shrink geogrid

Info

Publication number: CN201567554U
Application number: CN200920312177XU
Authority: CN
Inventors: 宣维栋; 史建军; 方文叶; 朱忠裕; 王友存; 张从勇
Original assignee: TIANMO GROUP CO Ltd CHANGZHOU
Current assignee: TIANMO GROUP CO Ltd CHANGZHOU
Priority date: 2009-10-10
Filing date: 2009-10-10
Publication date: 2010-09-01
Anticipated expiration: 2019-10-10

Abstract

The utility model discloses a low-heat-shrink geogrid, which comprises mesh gray fabric and a reinforcing object, wherein the mesh gray fabric consists of warp and weft which are weaved by a warp knitting machine through weaving threads, and the reinforcing object is arranged around the mesh gray fabric and is bonded and fixed on the filaments of the warp and the weft of the mesh gray fabric and bounded between the filaments, so that the mesh gray fabric and the reinforcing object are bounded into a whole so as to form a geogrid. The materials of the warp and the weft are high modulus high-strength polyester fiber yarns, and the mesh size a x b of the geogrid is 38mm-42mm x 38mm-42mm. The geogrid can meet the requirements that the heat shrink is less than or equal to 0.5% at a temperature of 180 DEG C, and can be suitable for high temperature pavement of the dam bottom of a pumped storage power station.

Description

A kind of low-heat shrinkage geogrid

Technical field

The utility model relates to a kind of geo-grid, is specifically related to a kind of low-heat shrinkage geogrid that is applicable at the bottom of the pumped storage power plant dam.

Background technology

Pumped storage power plant is before the dam bottom pour mold is built bituminous concrete, and one deck geo-grid that need pave is with the effect at the bottom of playing reinforcement and strengthening the dam.Because the temperature when bituminous concrete paves is usually up to 180 ℃, common geo-grid hot contraction ratio under this temperature is bigger, does not reach requirement.

Chinese patent literature CN1233901C discloses a kind of non-woven reinforced pressure-sensitive earthworking grillage, used warp thread and weft yarn are the glass fiber synnema, the size of mesh opening of this geo-grid is 25.4mm * 25.4mm, heat treatment mode is the first drying typing, the secondary drying pressure sensitive adhesive, the road surface that this geo-grid is used for the plain asphalt road strengthens or the roadbed treatment of soft foundation, can not be used at the bottom of the pumped storage power plant dam.

Chinese patent literature CN101003964A discloses a kind of warp knitting geogrid built from synthetic fiber in high strength, this geo-grid be used for different road surfaces, roadbed, reinforcing domatic, road strengthens, its elongation per unit length is up to 15%, used warp thread and weft yarn are polypropylene fibre synnema or conventional polyester filament tow, the size of mesh opening of geo-grid is 25.4mm * 25.4mm, heat treatment mode is the first drying typing, and the thermal contraction of this geo-grid in the time of 180 ℃ is up to 12%.

The utility model content

The purpose of this utility model provides a kind of low-heat shrinkage geogrid that is applicable to that high temperature paves at the bottom of the pumped storage power plant dam.

The technical scheme that realizes the utility model purpose is: a kind of low-heat shrinkage geogrid has net grey cloth and reinforce; The net grey cloth is made through the tricot machine chaining by the chaining line by warp thread and weft yarn; Reinforce is provided with around the net grey cloth, and is adhesively fixed on the monofilament of the warp thread of net grey cloth and weft yarn and is bonded in mutually between these monofilament, makes net grey cloth and bonding being integral of reinforce and becomes geo-grid.The material of warp thread and weft yarn is high-module high-strength polyester fiber synnema, and the size of mesh opening a * b of geo-grid is 38mm～42mm * 38mm～42mm.

Size of mesh opening a * the b of described geo-grid is 40mm * 40mm.

The heat treatment mode of described geo-grid is twice drying and shaping: bake out temperature is 130 ℃～140 ℃ for the first time, and bake out temperature is 180 ℃～190 ℃ for the second time.

The utlity model has positive effect: warp thread and weft yarn that (1) geo-grid of the present utility model adopts are high-module high-strength polyester fiber synnema, this high-module high-strength polyester fiber synnema wants high temperature heat-resistant to shrink than common polyester fiber synnema, thereby reduces the percent thermal shrinkage when high-temperature process.(2) size of mesh opening of geo-grid of the present utility model is up to 38mm～42mm * 38mm～42mm, gathering materials in the bituminous concrete run through wherein, form mechanical interlocking, thereby limited the motion of gathering materials, make bituminous mixture be subjected to load condition to be issued to better compaction state, higher lifting capacity, better loading transfer performance.(3) geo-grid of the present utility model can also be coated with the wear-resisting finish of being made up of unsaturated high-grade fatty acid in the monofilament surface of warp thread and weft yarn, can reduce the wearing and tearing of fiber in the braiding process like this.(4) geo-grid of the present utility model adopts the method for twice oven dry, solved common geo-grid is subject to high temperature deformation in paving a difficult problem, mainly be that the temperature of first road reinforce oven dry is set at 130 ℃～140 ℃ promptly can to guarantee to dry the back screen cloth indeformable, the temperature of following the oven dry of second road is set at 180 ℃～190 ℃ and can carries out the preshrunk processing to the screen cloth that contains reinforce, satisfies the requirement of thermal contraction≤0.5% under 180 ℃ of conditions.

Description of drawings

Fig. 1 is the Facad structure schematic diagram of the net grey cloth of geo-grid of the present utility model;

Fig. 2 is the A-A cross-sectional schematic among Fig. 1;

Fig. 3 is the B-B cross-sectional schematic among Fig. 1;

Fig. 4 is the reverse side structural representation of Fig. 1.

The specific embodiment

(embodiment 1)

See Fig. 1 to Fig. 4, the low-heat shrinkage geogrid of present embodiment has net grey cloth 1 and reinforce.Net grey cloth 1 is to be made through the tricot machine chaining by chaining line 13 by four groups of warp thread 11 and two groups of weft yarns 12.Reinforce is provided with around net grey cloth 1, and is adhesively fixed on the monofilament of the warp thread 11 of net grey cloth 1 and weft yarn 12 and is bonded in mutually between these monofilament, makes net grey cloth 1 become geo-grid with bonding being integral of reinforce.

The warp thread 11 in the net grey cloth of present embodiment and the material of weft yarn 12 all are high-strength and high-modulus polyester fiber synnemas, and the material of used chaining line 13 is high-strength low contraction terylene long filament.

Present embodiment also is coated with the wear-resisting finish of being made up of unsaturated high-grade fatty acid in the monofilament surface of warp thread 11 and weft yarn 12, and the weight of wear-resisting finish accounts for 0.2% of low-heat shrinkage geogrid gross weight.

The reinforce of present embodiment is the oven dry thing of the mixture of modified bitumen and high-strength benzene emulsion, and the weight ratio of wherein high-strength benzene emulsion and modified bitumen is 1: 1, and the weight of reinforce accounts for 20% of low-heat shrinkage geogrid gross weight.

The intensity of the geo-grid of present embodiment is up to 50KN/m, and size of mesh opening a * b is 40mm * 40mm, thermal contraction≤0.5% of geo-grid in the time of 180 ℃.

The manufacture method of the geo-grid of present embodiment is: with warp thread and the weft yarn of high-strength and high-modulus polyester fiber as the net grey cloth, and apply wear-resisting finish in the monofilament surface of warp thread and weft yarn, four warp thread, two weft yarns are made net grey cloth through tricot machine with the chaining method by one group of (eight) chaining line.This net grey cloth has the chaining crosspoint at warp thread, weft yarn infall, and warp thread only one side has the chaining line, and another side does not have the chaining line.By in the dipping tank that fills reinforced modifier, the drying machine carries out the screen cloth that the first road reinforce oven dry obtains containing reinforce again with the net grey cloth made, and bake out temperature is 130 ℃～140 ℃, and the screen cloth after can guaranteeing like this to dry is indeformable.Then the drying machine carries out the oven dry of second road again, and bake out temperature is 180 ℃～190 ℃, can carry out preshrunk like this to the screen cloth that contains reinforce and handle, thereby make thermal contraction≤0.5% of geo-grid under 180 ℃.

The using method of the geo-grid of present embodiment is: on the ground of smooth, cleaning, drying, make on the smooth ground that paves of geo-grid with unreeling the method for laying machinery or manually paving, roll with clean pneumatic-tired rollers then, nail again, repave asphalt concrete pavement subsequently and get final product.Because the size of mesh opening of geo-grid is up to 40mm * 40mm, gathering materials in the bituminous concrete run through wherein, form mechanical interlocking, thereby limited the motion of gathering materials, make bituminous mixture be subjected to load condition to be issued to better compaction state, higher lifting capacity, better loading transfer performance.

Claims

1. a low-heat shrinkage geogrid has net grey cloth (1) and reinforce; Net grey cloth (1) is made through the tricot machine chaining by chaining line (13) by warp thread (11) and weft yarn (12); Reinforce is provided with around net grey cloth (1), and is adhesively fixed on the monofilament of the warp thread (11) of net grey cloth (1) and weft yarn (12) and is bonded in mutually between these monofilament, makes net grey cloth (1) and bonding being integral of reinforce and becomes geo-grid; It is characterized in that: the material of warp thread (11) and weft yarn (12) is high-module high-strength polyester fiber synnema, and the size of mesh opening a * b of geo-grid is 38mm～42mm * 38mm～42mm.

2. low-heat shrinkage geogrid according to claim 1 is characterized in that: the size of mesh opening a * b of described geo-grid is 40mm * 40mm.