CN218713801U - Inflation soil envelope drainage system - Google Patents

Abstract

The utility model provides an expansive soil covering drainage system, which is used for drainage in an expansive soil area and comprises a drainage structure and a covering layer; the drainage structure comprises a drainage side ditch and a water collecting well, the drainage side ditch is arranged outside the expansive soil area, the top surface of the drainage side ditch is not higher than the bottom of the covering layer, the water collecting well is arranged along the drainage side ditch, and broken stones are paved in the drainage side ditch and the water collecting well; the loam cake layer covers the native region of inflation, the loam cake layer has loam cake bottom surface and loam cake top surface, the loam cake bottom surface is one-way permeable layer, only allows water to upwards permeate through the loam cake bottom surface, the loam cake bottom surface has domatic structure, the loam cake top surface is two-way permeable layer, the loam cake bottom surface with be provided with the aggregate bed course between the loam cake top surface. Adopt the utility model discloses an inflation soil closing cap drainage system can solve among the prior art technical problem that inflation soil foundation treatment work volume is big, the consumptive material volume is big.

Description

Inflation soil envelope drainage system

Technical Field

The utility model relates to a technical field is administered to the ground soil body, concretely relates to inflation soil closing cap drainage system.

Background

The problem of expansion and water loss shrinkage when meeting water (water inflow) often occurs in the foundation of the expansive soil area, and the problem is repeated, so that serious accidents, damages and hidden dangers are caused to engineering stability and safety.

For expansive soil foundations, foundation treatment is generally considered. From the treatment perspective, many tests, researches, designs, constructions, detection and monitoring are carried out at home and abroad, but all treatment methods are free from filling replacement, water isolation and improvement (doping, component and structure change and engineering property change) and pay huge cost. And if the treatment is not in place, the hidden danger still exists. In the concrete measures aiming at the expansive soil foundation treatment, the prior art mainly adopts a method of excavating expansive soil and filling non-expansive soil, and the method has large engineering quantity; the method of mixing with expansive soil to change physical components and structure is also adopted to carry out chemical reaction to change chemical components and physical structure, thereby changing engineering properties, and the method needs large material and cost and has large engineering quantity.

For the expansive soil foundation, factors influencing expansive soil are considered to be treated, eliminated or treated, but the soil body is not treated, and the prior art lacks the technical achievement in the aspect.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing an inflation soil closing cap drainage system solves the technical problem that inflation soil foundation treatment work volume is big among the prior art, the consumptive material volume is big.

In order to achieve the above object, the utility model provides an inflation soil be built by contract drainage system, include: a drainage structure and a covering layer; the drainage structure comprises a drainage side ditch and a water collecting well, the drainage side ditch is arranged outside the expansive soil area, the top surface of the drainage side ditch is not higher than the bottom of the covering layer, the water collecting well is arranged along the drainage side ditch, and broken stones are paved in the drainage side ditch and the water collecting well; the loam cake layer covers the native region of inflation, the loam cake layer has loam cake bottom surface and loam cake top surface, the loam cake bottom surface is one-way permeable layer, only allows water to upwards permeate through the loam cake bottom surface, the loam cake bottom surface has domatic structure, the loam cake top surface is two-way permeable layer, the loam cake bottom surface with be provided with the aggregate bed course between the loam cake top surface.

Compared with the prior art, the beneficial effects of the utility model reside in that:

the utility model discloses an inflation soil loam cake drainage system sets up to one-way permeable bed through the loam cake bottom surface, on the one hand can block rainwater infiltration, blocks surface water, infiltration and enter inflation soil, and make it arrange to the gutter smoothly, go into the sump pit and take out the place; on the other hand, water in the expansive soil is allowed to smoothly pass through the bottom surface of the ladle cover in the forms of permeation, evaporation and the like, so that capillary water in the expansive soil is further promoted to rise into the ladle cover layer and is gradually discharged out of the field. Through the slope structure of the bottom surface of the ladle cover, water can smoothly converge into the drainage structure on the outer side along the bottom surface of the ladle cover after entering the ladle cover layer, and the water can be drained quickly and effectively. Adopt the utility model discloses an inflation soil loam cake drainage system carries out drainage treatment to inflation soil foundation, neither need trade and fill out inflation soil, also need not the doping change structure, changes chemical composition and engineering nature. The utility model discloses an inflation soil be built by contract drainage system can cut off surface water, infiltration entering inflation soil body, groundwater, various reason ponding that rise in the inflation soil body of natural discharge, and do not change its drainage property, utilize original state soil structure, hardness, bearing capacity to save engineering volume, material and manpower and materials greatly.

Preferably, the bottom surface of the ladle cover also covers the bottom surface of the drainage structure.

Preferably, the ladle cover top surface is provided with a slope surface structure the same as that of the ladle cover bottom surface.

Preferably, the ladle cover top surface and the aggregate cushion layer also cover the top surface of the drainage structure, and a reverse filter layer is arranged between the aggregate cushion layer and the broken stones.

Preferably, the top surface of the cover also covers an area outside the drainage structure for a preset distance.

Preferably, the thickness of the pellet mat layer is 20 to 30cm.

Preferably, the system further comprises a soil isolation layer, the soil isolation layer is arranged between the drainage structure and the expansive soil area, and the covering layer covers the soil isolation layer.

Preferably, the soil isolation layer has a width of 3m.

Drawings

In order to illustrate the embodiments of the present invention more clearly, the drawings needed for the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is the structure schematic diagram of the expansive soil covering drainage system of the utility model.

Wherein: the water drainage structure 1, the ladle cover layer 2, the ladle cover bottom surface 21, the ladle cover top surface 22, the granular material cushion layer 23, the soil isolation layer 3 and the expansive soil area 4.

Detailed Description

To make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the attached drawings in the embodiments of the present invention are combined to clearly and completely describe the technical solution in the embodiments of the present invention, and obviously, the described embodiments are part of the embodiments of the present invention, rather than all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Fig. 1 is the structure schematic diagram of the expansive soil covering drainage system of the utility model. As shown in fig. 1, the embodiment discloses an expansive soil covered drainage system, which is used for draining water in an expansive soil area 4 and comprises a drainage structure 1 and a covered layer 2; the drainage structure 1 comprises a drainage side ditch and a water collecting well, wherein the drainage side ditch is arranged outside the expansive soil area, the top surface of the drainage side ditch is not higher than the bottom of the covering layer 2, the water collecting well is arranged along the drainage side ditch, and broken stones are paved in the drainage side ditch and the water collecting well; the loam area is covered to the involucrum layer 2, and involucrum layer 2 has involucrum bottom surface 21 and involucrum top surface 22, and involucrum bottom surface 21 is the one-way permeable bed, only allows water to upwards see through involucrum bottom surface 21, and involucrum bottom surface 21 has domatic structure, and involucrum top surface 22 is the two-way permeable bed, is provided with aggregate bed course 23 between involucrum bottom surface 21 and the involucrum top surface 22.

The bottom surface 21 of the ladle cover is provided with a one-way permeable layer, so that rainwater infiltration can be blocked, surface water and seepage water can be blocked from entering expansive soil, and the expansive soil can be smoothly discharged to a drainage side ditch and then enters a water collecting well to be pumped out of a field; on the other hand, water in the expansive soil is allowed to smoothly pass through the bottom surface 21 of the ladle cover in the forms of permeation, evaporation and the like, so that capillary water in the expansive soil is further promoted to rise into the ladle cover layer 2 and be gradually discharged out of the field.

In a particular embodiment, a unidirectional geomembrane is used as the one-way water permeable layer. The unidirectional geomembrane has the characteristics of high puncture strength, good aging resistance, wide environmental temperature range adaptation and stable quality, and is suitable for long-term use in engineering. In actual engineering, the one-way permeable layer can be formed by splicing a plurality of one-way geomembranes, and the bonding width between the adjacent geomembranes is not less than 30cm.

The slope structure of the bottom surface 21 of the ladle cover is specifically set such that a point inside the bottom surface 21 of the ladle cover is used as the highest point of the bottom surface 21 of the ladle cover, preferably, the midpoint of the ground of the ladle cover is used as the highest point, and other parts of the bottom surface 21 of the ladle cover sequentially extend outwards and downwards to form a slope structure with high inside and low edge, which is beneficial for water to smoothly flow into the drainage structure 1 on the outer side along the bottom surface 21 of the ladle cover after entering the covering layer 2. In some preferred embodiments, the slope structure has a slope gradient of not less than 2%.

In this embodiment, the top surface 22 of the cover is provided to prevent the gravel, filling soil and other particles from falling into the granular cushion layer 23, which are generated by filling soil or laying a structural layer on the top surface, so as to ensure the stability of the granular cushion layer 23, and prevent sharp particles from entering the granular cushion layer 23 and piercing the bottom surface 21 of the cover.

In one particular embodiment, a bi-directional geotextile is used as the cover top surface 22. The bidirectional geotextile is a water-permeable geosynthetic material formed by needling or weaving synthetic fibers, has the characteristics of high strength and capability of keeping sufficient strength and elongation in a dry and wet state, can resist corrosion for a long time in soil and water with different pH values, has good resistance to microorganisms and worm damage, and is not damaged by the microorganisms and the worm damage; in addition, the bidirectional geotextile material is light and flexible, and is convenient to transport, lay and construct; the bidirectional geotextile also has good bidirectional water permeability, which not only allows rainwater and surface water to quickly permeate into the covering layer 2, but also allows excessive water in the covering layer 2 to permeate out of the top surface and be quickly discharged.

In one particular embodiment, a course sand layer is used as the pellet mat 23. The medium coarse sand is easy to lay, the construction is rapid, simple and feasible, and the uniformity is easy to control; in some preferred embodiments, the thickness of the granular mat 23 is 20 to 30cm, and the thickness of the granular mat 23 may be specifically determined according to the amount of rainwater in the area where the area to be drained is located.

In practical engineering, it can be determined whether the ladle cover top surface 22 is provided with a slope structure and the slope thereof according to practical conditions. The ladle cover top surface 22 can be set to have the same slope structure as the ladle cover bottom surface 21, and the thickness of the granular material cushion layer 23 is the same at all positions; the upper surface 22 may be flat, or have a peak that is the same as the lower surface 21 but a different slope, or a peak that is different from the lower surface 21, in which case the thickness of the granular mat 23 is not exactly the same throughout.

In particular, the bottom surface 21 of the cover also covers the bottom surface of the drainage structure 1, which is beneficial to prevent water in the drainage structure from permeating into the expansive soil.

In a specific embodiment, the pack cover top surface 22 and the aggregate cushion layer 23 also cover the top surface of the drainage structure 1, and prevent gravel, filling soil and other broken particles generated by filling soil or laying a structural layer on the pack cover top surface 22 from falling into the drainage structure 1; wherein, be provided with the inverted filter between granule bed course 23 and the rubble, prevent that the granule in the granule bed course 23 from getting into the rubble hole.

In a particular embodiment, the ladle top surface 22 also covers an area outside the drainage structure 1 for a predetermined distance to ensure that water coming out of the edges of the granular mat 23 does not enter the expansive soil 4 but enters the drainage structure 1.

In a specific embodiment, the soil isolation layer 3 is further included, the soil isolation layer 3 is arranged between the drainage structure 1 and the expansive soil area, and the covering layer 2 covers the soil isolation layer 3 to prevent water in the granular material cushion 23 and the drainage structure 1 from penetrating into the expansive soil 4. Wherein the soil isolation layer 3 is formed by soil body of non-expansive soil. In some preferred embodiments, the width of the soil isolation layer 3 is 3m.

The foregoing description of various embodiments of the invention is provided to those skilled in the art for the purpose of illustration. It is not intended to be exhaustive or to limit the invention to a single disclosed embodiment. As described above, various alternatives and modifications of the present invention will be apparent to those skilled in the art to which the above-described technology pertains. Thus, while some alternative embodiments have been discussed in detail, other embodiments will be apparent or relatively easy to derive by those of ordinary skill in the art. The present invention is intended to embrace all such alternatives, modifications and variances which have been discussed herein, and other embodiments which fall within the spirit and scope of the above application.

Although the present invention has been described in terms of embodiments, those of ordinary skill in the art will recognize that there are numerous variations and modifications of the invention without departing from the spirit of the invention, and it is intended that the appended claims include such variations and modifications without departing from the spirit of the invention.

Claims (8)

1. The expansive soil covering drainage system is used for drainage in an expansive soil area and is characterized by comprising a drainage structure and a covering layer;

the drainage structure comprises a drainage side ditch and a water collecting well, the drainage side ditch is arranged outside the expansive soil area, the top surface of the drainage side ditch is not higher than the bottom of the covering layer, the water collecting well is arranged along the drainage side ditch, and broken stones are paved in the drainage side ditch and the water collecting well;

the loam cake layer covers the native region of inflation, the loam cake layer has loam cake bottom surface and loam cake top surface, the loam cake bottom surface is one-way permeable layer, only allows water to upwards permeate through the loam cake bottom surface, the loam cake bottom surface has domatic structure, the loam cake top surface is two-way permeable layer, the loam cake bottom surface with be provided with the aggregate bed course between the loam cake top surface.

2. The expansive soil cover drainage system of claim 1, wherein said cover bottom surface further covers said drainage structure bottom surface.

3. The expansive soil canopy drainage system of claim 1, wherein the canopy top surface has the same slope configuration as the canopy bottom surface.

4. The expansive soil cover drainage system of claim 1 wherein said cover top surface and said aggregate underlayment further cover the top surface of said drainage structure, and wherein an inverted filter is disposed between said aggregate underlayment and said crushed stone.

5. The expansive soil cover drain system of claim 4, wherein the top surface of the cover further covers an area outside the drain structure by a predetermined distance.

6. The expansive soil cover drainage system of claim 1, wherein said granular mat has a thickness of 20 to 30cm.

7. The expansive soil cover drainage system of any one of claims 1-6, further comprising a soil isolation layer disposed between the drainage structure and the expansive soil region, the cover layer covering the soil isolation layer.

8. The expansive soil cover drainage system of claim 7, wherein the soil isolation layer has a width of 3m.

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