CN2499446Y - Piping filter pad for anti-flood and protection - Google Patents

Abstract

The utility model relates to a piping filter pad for anti-flood and protection with three layers which is characterized in that an upper layer and a lower layer are earthwork pad and a middle layer is earthwork textile. Three layers material are fixed into a whole body, wherein the earthwork pad is modification polyethylene fiber which is overlapped together and smelted to three-dimensional solid multi-aperture material. The preferable thicknesses of the upper layer earthwork pad and the lower layer earthwork pad are 15mm. The application provides the piping filter pad for anti-flood and protection, therefore earth and stone engineering is changed to industrial product in batch use. If needing anti-bedding in anti-flood, the filter pad is directly paved on the clear location. The paving is very convenient and speedy. The utility model can protect sand in the water and eliminate water potential. The earthwork textile characteristic is not influenced by deformation and can be reused. The anti-flood work cost can be greatly reduced. The industry product has a complete range of specifications, and can be applicable to different earthiness stratal requirements. The orderly product provides convenience for transport and storage anti-flood goods and materials.

Description

The flood fighting piping filter bed of rescuing and protecting

Skill this area

The application relates to a kind of water conservancy equipment, particularly a kind of flood fighting piping filter bed of rescuing and protecting.

Background technology

China has dyke 250,000 km now, wherein main dyke 6.57 ten thousand km.Its characteristics: (1) levee foundation condition is poor; (2) levee body fills of poor quality; (3) swag reaches levee toe protection more behind the dike.Dyke dangerous situation such as piping often takes place, come down and overflow when therefore meeting with flood.Particularly very dangerous under the big flow of flood, high water level, long-time condition of soaking, dangerous situation is continuous.With regard to piping and leak dangerous situation, its scope is big to reach tens thousand of square metres, and the seriousness of its dangerous situation can directly cause dike breaching.The piping dangerous situation of rescuing and protecting is enclosed the well except that commonly used, and another kind of effective measures are filter blanket, and it act as and reduces the water burst flow velocity, prevents sand grains to run off, to stablize the piping dangerous situation.The normal filter blanket that adopts of prior art has sandstone filter blanket, tip material filter blanket and geotextile filter blanket: the sandstone filter blanket is applicable to the area of sandstone sufficient material source; have at the sheet of having cleared up on piping group's the area; bedding one deck coarse sand; spread handstone and big each one deck of stone on it more respectively; last gland slabstone or piece stone are protected.Tip material loaded filter bedding, spread fines such as wheat straw during making earlier, straw etc., repave coarse fodder such as reed, withy etc., upper berth straw mattress, seat sheet or reed mat then, tip seat alternating layers are laid like this, according to circumstances can spread one or more layers, use piece stone or earth bag gland then, floating to prevent tip material, prevent water burst band sand.The geotextile filter blanket needs behind the ground leveling of piping place, the dissipation head, and the worker's fabric that spreads a layer of clay repaves general permeable material or sand, last gland slabstone or piece stone.The piping dangerous situation is after the weak part of weak permeable loam in top layer or mucky soil is worn on the artesian water top of permeable sand-layer foundation, and the destruction that concentration of local seepage flow forms is taken place.At this moment, surface soil layer has formed a permeable cavity, and the soil particle of permeable layer of sand is with the infiltration current hole that constantly gushes out, and similar change diameter is ducted holds the sand water movement under the arm.The particle diameter of the size in piping aperture, the kinetic head of holding the sand current under the arm, sand content and sand grains is all looked seepage gradient, earth formation and sand grains particle diameter and is different.It is different from the flow-shape when preventing the piping generation usually.Therefore, when the piping dangerous situation of rescuing and protecting adopts filtering layer, except that the factor of considering the failure by piping filtering layer, also need consider to hold under the arm in the kinetic head of sand current and the current factors such as entrained gravel particle diameter, more than preventing failure by piping filtering layer complexity.Three kinds of schemes of prior art all need the implementer to accept the training of this respect in advance, and need certain practical experience.Simultaneously, these three kinds of technology all need at the scene bedding length by length, and speed is slow, and the actual needs of racing against time with the flood fighting scene has certain distance.

Summary of the invention

The application's purpose is development and develops the commercialization filter bed of a kind of batch process of the piping dangerous situation of rescuing and protecting.This filter bed produces complete filter bed with the industrial production of mass, and when needing filter blanket in the flood fighting, only need directly be routed to this filter bed on the good location of cleaning and get final product, and lay very convenient, rapid.It can not only the permeable guarantor's sand and the dissipation flow of water, and can protect filter core (as geotextile) can not influence its characteristic because of distortion.Simultaneously, because of using repeatedly, can reduce the cost of work of combatting a flood significantly.

In order to finish the foregoing invention task, the inventor has proposed flour sand, fine sand and three kinds of soil property generations of medium sand piping on the basis of the indoor single piping test of rescuing and protecting, when the application geotextile is rescued and protected, and the characteristic parameter that geotextile is different; And on the basis of piping group test of rescuing and protecting, determined that rescue and protect single piping dangerous situation required size and filter bed loam cake of filter bed is heavy; Because it is all complicated to hold the entrained sand grains particle diameter of sand current, concentration and size under the arm, so the silting of filtering layer and the situation of silting up need be paid attention to, by the test decision.On the basis of above calculating and experiment, design following product: the piping filter bed is prevented in a kind of flood fighting, constitutes by three layers; it is characterized in that: upper and lower two-layer topping and the decompression layer of being respectively, can adopt geotechnological straw mats, the centre is a filter core; can adopt geotextile, trilaminate material is fixing in aggregates.Described geotechnological straw mats are stacked together by some fibers and constitute.Fiber can be wire or the nonmetal wire about diameter 1.5～3mm, but more preferred plastics silk, and each stacks together and is formed with certain intensity, silt is had filtering function, water permeability porous material preferably again.Stacked fixing mode can be according to the character decision of fiber between each fiber, when for example selecting hot-melt plastics such as modified poly ethylene for use, the fiber that squeezes out about 2mm by nozzle after the plastics heating and melting can be stacked together, clinkering forms the 3 D stereo porous material.The geotechnique of its lower floor straw mats mainly play the control flow of water, resist to hold under the arm the kinetic head of sand current, can partly substitute the piece stone and the macadam of bottom, can be thicker.Upper strata geotechnique's straw mats are topping, can be more thinner than lower floor, provide advantage for covering from now on to press.When selecting middle level construction fabric filtering layer, should consider the compressibilty of fabric, its thickness porosity, aperture and water permeability reduce with the increase of compressive stress, particularly the acupuncture geotextile.Therefore, when adopting geotextile to make trap drainage, must consider the size of overlying burden (compressive stress), two filtering layer conditions that draining is unobstructed to satisfy, the protection grogs does not run off.The filter bed of being developed is at present taked the certain protection measure on geotextile, can guarantee that geotextile does not deform.Adopt different geotextiles to serve as the middle level structure, form the product of different size.At the different gravel foundations of being rescued and protected, adopt the geotextile product of different indexs.Behind this filter bed of bedding, make progress hold the geotechnological straw mats of sand current by the filter bed bottom under the arm the time current are spread in straw mats, dissipation part flow velocity current on the other hand because straw mats are thicker, also can make vertical current change the plane into and flow, kinetic head decreases.Therefore, the bottom straw mats can be controlled the water burst flow of water, reduce the seepage velocity by woven membrane, and after flow velocity descended, holding the water yield of sand current and sand content etc. under the arm can reduce rapidly, and the gravel particle diameter of carrying under one's arms also attenuates thereupon.When reality is used, the design often uses with enclosing well, recommends by following method of operating: 1, indoor according to designing requirement, make filter bed (by different sand grains configuration geotextile filtering layers), coaming plate and latch etc., concrete quantity is determined according to reality, and is stocked; 2, after the discovery piping, filter bed, coaming plate and the latch etc. that choose are transported to the scene; 3, rescue and protect piping dangerous situation place and excavation of cleaning laid the groove of coaming plate; 4, filter bed is placed place, piping hole, and add a cover heavily; Too big as the flow of water, can place filter bed again with piece stone dissipation part head earlier.For single piping, can directly rescue and protect below 20cm in its piping aperture; When the piping aperture greater than 20cm or piping public sentiment condition, several filter beds can be spliced into integral body, rescued and protected.Splice available special " U " shape connector.

The flood fighting that the application the provides piping filter bed of rescuing and protecting changes the earth and rock works in the work of combatting a flood into the industrial products that use mass.When needing filter blanket in the flood fighting, only need directly be routed to this filter bed on the good location of cleaning and get final product.Lay very convenient, rapid.It can not only the permeable guarantor's sand and the dissipation flow of water, and can protect geotextile can not influence its characteristic because of distortion.Simultaneously, because of using repeatedly, can reduce the cost of work of combatting a flood significantly.While is complete in specifications because of industrial products, can adapt to the needs on different soil properties stratum.Neat product provides convenience also for transportation, deposit flood fighting goods and materials.

Description of drawings

Fig. 1 is the embodiment of the present application structural representation.

The specific embodiment

Embodiment 1, with reference to Fig. 1: the flood fighting piping filter bed of rescuing and protecting, constitute by three layers, it is characterized in that: two-layer up and down is that the fiber that will squeeze out about 2mm by nozzle after the modified poly ethylene heating and melting stacks together, clinkering forms the 3 D stereo porous material, become geotechnological straw mats 1,3, thickness is 15mm.The intermediate layer is a geotextile 2, and trilaminate material is fixing in aggregates.Whole filter bed monolithic size is decided to be 100 * 100cm ²For single piping, can directly rescue and protect below 20cm in its piping aperture; When the piping aperture greater than 20cm or piping public sentiment condition, several filter beds can be spliced into integral body, rescued and protected.Splice available special " U " shape connector.The intermediate layer is a geotextile, and its hydraulic characteristic(s) depends on flow velocity, the sand content of holding the sand current under the arm and holds the sand grains footpath under the arm.Use the geotextiles effective laboratory test of piping dangerous situation of rescuing and protecting by 26 groups, and consider the multiple factor (as execution conditions etc.) of the actual piping of rescuing and protecting, draw and actually rescue and protect during different sand sample the characteristic index of geotextile.When the application filter bed is rescued and protected the piping dangerous situation, need at the filter bed upper press cover.Last cover material material gravimetric value is determined by test.

Claims (3)

1, a kind of flood fighting piping filter bed of rescuing and protecting; constitute by three layers; two-layer up and down topping and the decompression layer of being respectively; the intermediate layer is a filter core; it is characterized in that: the geotechnological straw mats of two-layer up and down employing; the middle geotextile that adopts, trilaminate material is fixing in aggregates, and described geotechnological straw mats are stacked together by some fibers and constitute.

2, according to the described flood fighting of the claim 1 piping filter bed of rescuing and protecting, it is characterized in that: described geotechnological straw mats are that modified polyethylene fiber stacks together, the 3 D stereo porous material that clinkering forms.

3, according to claim 1 or the anti-piping filter bed of 2 described flood fightings, it is characterized in that: the preferred thickness of upper and lower two-layer geotechnological straw mats is 15mm.

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