CN1526885A - Honeycomb sand-binding plastic braid net - Google Patents

Abstract

The present invention relates to honeycomb sand-binding plastic braid net. It consists of interlaced honeycomb lattices of 1x1 m to 2x2 m size and 20-40 cm height and 14-18 mesh wall. The present invention may be industrially produced, has low cost, ageing resistance and convenient construction, has wide application foreground in tackling desert and controlling sand of storm hazard and may be used to replace traditional straw lattices.

Description

Cellular plastic knitting Sand-fixation net

Technical field

The present invention relates to preventing and fixing sand plastic knitting Sand-fixation net.

Background technology

Wrapping blue railway is the trunk railway that Tengger desert passes through in China, is the main artery that connects North China and northwest, and wherein location, Shapotou trellis moving dunes are tall and big intensive.Over more than 30 year, through three generations people's unremitting effort, having explored effective admittedly hinder combination, is main through vegetative sand control based on admittedly, the technical measures that vegetative sand control and machinery fix the sand to combine.Promptly the width that fixes the sand in railway main air side is 500 meters, and inferior wind side is 200 meters, adopts 1 * 1 meter straw checkerboard barrier sand-protecting barrier, for vegetative sand control is created a stable condition.In annual precipitation is that 200 millimeters steppification desert takes the vegetative sand control under the non-irrigated condition to obtain breakthrough achievement.Utilize vegetable seeds self water retaining functions such as psammophytes oil wormwood artemisia, sand sagebrush (Artemisia filifolia), hedysarum scoparium, caragana microphylla, husky honey raisin tree, build up artificial vegetation preferably through 8-10, coverage can reach 30%.Along with vegetation coverage increases, the sand ground natural environment improves, and forms the natural cover for defense one, thereby guarantees that the blue railway two of bag is unblocked during the last ten years, obtains remarkable social benefit and economic benefit.As time goes on, the straw checkerboard barrier of Pu Sheing is rotten then, and some sand and dust plant such as shrubs such as husky honey raisin tree, hedysarum scoparium are because moisture condition worsens, and it is withered to have failed, and the vegetative sand control that two more than ten years were obtained faces new wind erosion threat again.Again repair and lay straw checkerboard barrier and also run into new problem to the innerland, desert, the one, wheat straw is the raw material of paper-making industry, buy and collect difficulty, the 2nd, lay straw checkerboard barrier need artificial many, the financial cost height; The 3rd, the transportation difficulty; The 4th, the life-span of wheat straw has only 2-3.Add shrubbery, shrubbery, anti-sand furrow (the hindering husky wall) measure of etc.ing from straw checkerboard barrier, clay, gravel, the straw checkerboard barrier of present employing, with regard to itself characteristic with that content is set is different, to the resistance of stream, consolidate, fail effect and have evident difference.Fix the sand function coefficient and cost coefficient comparison, the often effect height that cost is big from above measure resistance.With regard to the relative unit cost, straw checkerboard barrier and shrubbery have that cost is low, dustproof effect is most economical, the most practical, best material that cost is suitable with effect.The alternative of therefore positive development straw checkerboard barrier, the harm of firm drift sand, elimination dust storm is the problem that sediment control structure needing to demand solution urgently.

The content of invention

Purpose of the present invention aims to provide a kind of cellular plastic knitting Sand-fixation net, substitutes traditional straw checkerboard barrier with this, plays the husky effect of fixing the sand of resistance.

The object of the present invention is achieved like this

A kind of cellular plastic knitting Sand-fixation net is by certain area, the connection that interweaves up and down, and specification is 1m * 1m～2m * 2m, the cellular grid of the high 20～40cm of net wall constitutes; Mesh on the net wall is the 14-18 order.

Learn that from open-air site observation test the protection benefit of grid mainly shows the increase roughness of ground surface.Form comparatively smooth and stable concave curved surface, reduce the surface layer air velocity, also correspondingly reduce the transportability of sediments of air-flow, thereby change silt discharge with the feature that highly distributes with this.Form this concave panel, its degree of depth and the grid length of side have very big relation, and the ratio that measures concave curved surface depth capacity and the grid length of side from long-term observation generally all remains within 1: 10 scope, and its proportionate relationship also can obtain explanation from theory analysis:

With reference to Fig. 2, establishing h is maximum the wind erosion degree of depth, the i.e. degree of depth of concave curved surface of grid; L is the length of side of grid, and then the pass of concave curved surface depth capacity h and grid length of side L is:

h＝0.5Ltg(α/2) (1)

α in the formula is for doing husky angle of repose, 32 ° of average out to.From on-site inspection, the average of α is 28.6 °, try to achieve the h=11.4cm of the grid sand-protecting barrier of 1m * 1m by (1) formula by this angle, this value is about 1: 9 with the ratio of the grid sand-protecting barrier length of side, close with measured result, the reason that this minute differences occurs is in doing the on-site inspection of α value, and the α value has trend bigger than normal that is to say, the actual value of α should be less than 28 °.

The well-regulated undulatory underlying surface of being made up of this stable concave curved surface has a kind of lift effect of small-sized shallow slot, and it can guarantee that Shamian Island self does not play sand when high wind, a small amount of external sand material is handled upside down with the form of non-accumulation passes by.Because this underlying surface has certain " lift effect ", the external grains of sand there is castering action.

The present invention compared with prior art has following advantage

1, cheap, have anti-aging, the husky function of fixing the sand of resistance.

2, process raw material rich, but suitability for industrialized production.

3, be convenient to carrying, easy construction.

4, the anti-dust storm harm at industrial and mineral, traffic, coastal beach and cultural relics and historic sites has wide practical use, for control desertification, the generation positive role of preserving the ecological environment.

Description of drawings

Fig. 1 is a schematic diagram of the present invention

Fig. 2 is the husky graph of a relation that removes between the maximum wind erosion degree of depth (h) and the grid length of side (L) of the present invention

Fig. 3 is section of the present invention and air-flow streamline schematic diagram

The specific embodiment

In conjunction with the accompanying drawings, the present invention is described in further detail again

A kind of cellular plastic knitting Sand-fixation net is by certain area, the connection that interweaves up and down, and specification is 1m * 1m, the cellular grid 1 of the high 20cm of net wall constitutes; Mesh 2 on the net wall is 14 orders, passes four jiaos plastic mesh with timber wedge, pounds into sand ground after tightening and makes firm the combining of itself and sand ground.

Evidence, trellis sand-protecting barrier are used for preventing and treating the sand damage that is caused under the multi-direction effect more.On newly-installed cellular plastic knitting grid sand-protecting barrier, with reference to Fig. 3, when stream process mesh mouth, all there is eddy current to produce, after circling round, pass mesh, enter next grid.Whole wind sand drift streamline is wave, and along with the reduction of surface layer air velocity, drift sand is moved dynamics and weakened thereupon.Stream is by behind the grid, and it is long-pending husky that grid is produced all around, through the long-pending effect of abundant erosion, changes grid underlying surface character, forms comparatively smooth and stable concave curved surface, and ground formation biological breadcrust layer promotes soil-forming process, is that vegetative sand control is created a stable condition.

Claims (1)

1, a kind of cellular plastic knitting Sand-fixation net is by certain area, the connection that interweaves up and down, and specification is 1m * 1m～2m * 2m, the honeycomb mesh (1) of the high 20～40cm of net wall constitutes; Mesh on the net wall (2) is the 14-18 order.