CN2267270Y

CN2267270Y - Cushion like water sluice way equipment used on dam with back filtration function

Info

Publication number: CN2267270Y
Application number: CN96236235U
Authority: CN
Inventors: 任之忠; 刘顺发
Original assignee: Individual
Current assignee: Individual
Priority date: 1996-08-23
Filing date: 1996-08-23
Publication date: 1997-11-12
Anticipated expiration: 2006-08-23

Abstract

The utility model relates to a mattress-shaped displacement hull with the function of inverted filtration on a dam site. A plurality of plastic drainage plates are arranged longitudinally on the bottom layer of a geotextile. Each drainage plate is composed of a vertical piece and a cross link rib piece which are integrated by injection moulding, geotextile layers cover on the drainage plates, and the drainage plates and the upper and the lower geotextile layers are fixed into a whole through a nylon rope. Compared with the traditional sandy gravel displacement hull with the function of inverted filtration, the utility model has the advantages as follows: the infiltration flow conditions are considerably improved, the drainage effect is good, and a saturation line is greatly reduced; the engineering fabrication cost is low and is only about 14 percent of the fabrication cost of the sandy gravel square column displacement hull; the construction speed is fast, the construction is convenient, the man days are reduced by 12 times, and the construction period of an earth dam is shortened.

Description

The anti-water discharging body device of filtering of mattress formula dam site

The utility model relates to the banket anti-water discharging body device of filtering of the dam foundation on dam of hydraulic engineering.

Water discharging body generally all is designed to the prismatic water discharging body of enrockment behind the dam of existing soil property dam.The anti-water discharging body of filtering of this traditional sand gravel needs a large amount of sandstone material.And the sandstone material often will be taked from far river course.Because of ditch depth, the road is narrow, the slope is steep, vehicle is difficult to pass through more, transports very difficult.The construction of prismatic water discharging body all need be built with artificial, and is technical strong, expend many, construction costs height in man-hour, and building cycle is very long.Geosynthetics is widely used in engineering construction at present, but uses the anti-water discharging body beyond example still of filtering in earth dam downstream that geotextile combines with plastic draining board.Job practices, structure design, drainage effect and the observation procedure etc. that adopt this scheme so far as yet the someone relate to and the research that experimentizes.

The purpose of this utility model is the above-mentioned shortcoming that will overcome prior art, and a kind of anti-water discharging body device of filtering of mattress formula dam site that can shorten the earth dam construction period greatly and reduce construction costs is provided, and makes it have good drainage effect and performance.

Solution of the present utility model is: be layed in the plastic draining boards that many vertical layouts are set on the geotextile bottom of the dam foundation, every band drain is made up of vertical plate that is injected into one and horizontal dowel sheet; On band drain, be coated with the geotextile layer; By nylon rope band drain and upper and lower tissue layer are fixed as one.

When laying plastic draining board on the geotextile bottom, the spacing of each bar plastic draining board is about 2～4 meters.

Describe embodiment of the present utility model in detail below in conjunction with accompanying drawing.

Fig. 1 is the counter office's cloth structural representation of filtering the water discharging body device of mattress formula dam site.

Fig. 2 is the anti-layout plan of water discharging body on dam site of filtering of Fig. 1.

Referring to Fig. 1, what show among the figure is an anti-filter water discharging body.It is made up of the mouth organ frame grid type plastic plate 2 and the geotextile covering layer 4 that are laid on geotextile bottom 1 on the dam foundation, are injected into one.Vertical plate 21 parallel being set up in parallel of plastic draining board 2, its spacing is 2～4 millimeters, highly is 3～4 millimeters.Be provided with horizontal dowel sheet 22 between each vertical plate, horizontal dowel sheet is positioned at vertical plate central authorities among the figure, helps vertical plate and keeps stable, and levels all can be carried out draining.The about 100mm of the width of whole band drain, length then needs to decide with design.Relevant various sizes obviously are not limited to above-mentioned scope, can be decided according to the actual requirements.Every dotted line of dam 3 is represented a plastic draining board among Fig. 2.The spacing of each bar band drain is about 3 meters.For avoiding down when soil to change the position of band drain, use nylon rope 5 each band drain and tissue layer up and down are sewn into integral body.Covering fabric layer 4 can be avoided grogs to enter in the band drain resulting in blockage.

The used geotextile layer 1,4 of anti-filter water discharging body can be various weaving cloth or nonwoven.These weaving cloth or materials such as the best working strength height of nonwoven, corrosion resistant polypropylene or terylene.Nonwoven quantitatively is 250g/mm ²The time can satisfy general requirements.Suitable thicker better effects if.Because of the displacement of single-layer nonwoven is a bit larger tham dam body design water level seepage discharge, degree of safety can't satisfy drainage requirement, must be equipped with plastic draining board for this reason.After laying an amount of band drain on the nonwoven, just can increase displacement, the safety that effectively improves dam body greatly.In addition, the outer tissue layer that coats of band drain can play reverse filter effect, does not cause dam body soil to enter band drain inside and results in blockage.

To handle the basis well before on the dam foundation, laying water discharging body.Foreign material full scale clearances such as brick and tile stone in the basic soil to be fallen, utilize cal rolling after design density, the basis to be flattened, check and approve by the longitudinal gradient that designs i=0.01.And then by design size laying bottom layer of non-woven fabrics.The making of geotextile cloth is to adopt fritter to be combined into bulk.For example the cloth of 2 meters of fabric widths is made the big piece of 6m * 15m with the mode of making.The method that bulk and bulk are made with overlap joint at the scene again is combined into complete bottom and completes.Nonwoven adopts stitching person, and joint gap is not less than 3cm, and lap width is not less than 20cm.Spread a band drain by design every 3m again, the fabric cloth with wide 20cm on the plate covers one deck, and with nylon rope itself and fabric cloth is fixed as integral body.The last plain soil of filling out one deck 20cm in the above with light machine compacting, after this just can enter normal earth dam and fill the stage.Dam 3 is built to certain altitude, and base of dam dry stone wall rib body 6 begins construction.Nonwoven and band drain should insert in the dry stone wall 20 centimetres to protect.

This mattress formula anti-filter displacement hull is compared with traditional sand gravel anti-filter displacement hull, has following advantage:

1. the seepage flow condition is improved greatly, and drainage effect is good, and saturation declines to a great extent, and dam body is safer. Warp Repeatedly observe, dam body is stable, and downstream slope drying, soil moisture content are normal, and no seepage flow is overflowed and the humid zone appearance, The infiltration of downstream, dam is so clear that you can see the bottom, the anomalies such as no muddiness.

2. construction costs is low. It only is about 14% of the prismatic displacement hull cost of sand gravel.

3. speed of application is fast, and easy construction reduces work day and reaches 12 times more than, has greatly shortened the construction worker of earth dam Phase.

Claims

1, the anti-water discharging body device of filtering of mattress formula dam site, comprise the geotextile bottom (1) that is layed on the dam foundation, it is characterized in that said geotextile bottom (1) is provided with many plastic draining boards of vertically arranging (2), every band drain is made up of vertical plate that is injected into one (21) and horizontal dowel sheet (22); On band drain (2), be coated with geotextile layer (4); By nylon rope (5) band drain and upper and lower tissue layer are fixed as one.

2, water discharging body device as claimed in claim 1, the spacing that it is characterized in that said each bar plastic draining board (2) is 2～4 meters.

3, water discharging body device as claimed in claim 1 is characterized in that said geotextile layer (1,4) is weaving cloth or nonwoven.

4, water discharging body device as claimed in claim 3 is characterized in that said weaving cloth or nonwoven are polypropylene or polyester material.