CN221072912U - Self-priming sponge system for road engineering - Google Patents

Abstract

The utility model provides a self-priming sponge system for road engineering, including a channel, an original soil ramming layer, a gravel drainage layer and a planting soil layer, wherein the original soil ramming layer, the gravel drainage layer and the planting soil layer are laid in the channel from bottom to top in sequence, and a temporary water storage layer is formed at the top of the channel; a geomembrane is arranged between the original soil ramming layer and the gravel drainage layer, and a permeable geotextile is arranged between the gravel drainage layer and the planting soil layer; a plurality of partition walls are arranged along the length direction of the channel, and the bottom end of the partition wall extends to the original soil ramming layer; a permeable blind pipe is laid along the length direction of the channel, and the permeable blind pipe is buried in the gravel drainage layer, and the pipe body of the permeable blind pipe is evenly distributed with permeable holes, and the permeable blind pipe is connected to a well; a plurality of water-absorbing cotton threads are buried in the gravel drainage layer and the planting soil layer, and the bottom end of the water-absorbing cotton thread penetrates into the bottom of the gravel drainage layer. The system has the advantages of good self-storage water function to cope with disasters such as heavy rains, and can supplement the water shortage of plants in drought seasons to ensure the survival rate of green plants.

Description

A self-priming sponge system for road engineering

Technical Field

The utility model relates to the technical field of road engineering drainage and greening, in particular to a self-priming sponge system for road engineering.

Background technique

At present, my country is in a critical period of rapid urban development. As an indispensable part, urban road construction has an increasing proportion of construction land. Urban roads are one of the main impermeable underlying surfaces in cities. The traditional pipe drainage method leads to prominent problems such as high road drainage pressure and serious road pollution, which is difficult to meet the requirements of modern urban construction for the ecological environment.

Urban roads adopt sponge city design strategies and use biological retention ponds to retain, purify and infiltrate through the plants, soil and microbial systems in the area. They can not only store rainwater runoff, but also purify water through the triple synergistic effects of physical, chemical and biological effects of plants, soil and microorganisms. This is an important technical means for sponge city construction.

At present, the structure of the bioretention pond is divided into aquifer, cover layer (planting soil), permeable geotextile, gravel layer and compacted soil layer in order from top to bottom. An overflow facility is set at the end of the bioretention pond, and a perforated flower pipe is set in the gravel layer. The outlet of the overflow facility is connected to the perforated flower pipe and connected to the municipal rainwater pipe network. The cover layer of the bioretention pond is a biological filtration medium and can also play a role in water quality filtration. The permeable geotextile plays a filtering role and intercepts the upper material from entering the gravel layer to prevent clogging of the drainage pipe in the gravel layer and affecting the drainage strength of the bioretention pond. It is an important part of the bioretention pond.

Its main disadvantages:

(1) When encountering heavy rain, the water storage function of the bioretention ditch is mainly in the planting soil layer. The water storage capacity of the bioretention ditch itself is very limited. Most of the precipitation infiltrates or flows into the rainwater pipe network, which puts great pressure on the road drainage system.

(2) In remote areas or areas with difficult water supply, it is extremely inconvenient to provide water for roadside greening. The planting soil is exposed to the surface, and most of the soil moisture is easily lost when the temperature is high. When the moisture in the soil is absorbed and lost by the plants, the plants will dry up and die if the water is not replenished in time, causing great environmental damage and economic losses.

Utility Model Content

The purpose of the utility model is to address the deficiencies of the existing technology and thus provide a road engineering self-priming sponge system that has good self-storage water function to cope with disasters such as rainstorms and can supplement water shortage of plants in drought seasons to ensure the survival rate of green plants.

In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a self-priming sponge system for road engineering, comprising a groove, a compacted original soil layer, a gravel drainage layer and a planting soil layer, wherein the compacted original soil layer, the gravel drainage layer and the planting soil layer are laid in the groove in sequence from bottom to top, and the top of the groove forms a temporary water storage layer;

A geomembrane is arranged between the original soil ramming layer and the gravel drainage layer, and a permeable geotextile is arranged between the gravel drainage layer and the planting soil layer;

A plurality of partition walls are arranged along the length direction of the channel, and the bottom ends of the partition walls extend to the original soil ramming layer;

A water-permeable blind pipe is laid along the length direction of the channel, the water-permeable blind pipe is buried in the gravel drainage layer, the pipe body of the water-permeable blind pipe is evenly distributed with water-permeable holes, and the water-permeable blind pipe is connected to the water well;

A plurality of water-absorbing cotton threads are buried in the gravel drainage layer and the planting soil layer, and the bottom ends of the water-absorbing cotton threads penetrate into the bottom of the gravel drainage layer.

Preferably, the geomembrane is laid longitudinally along the bottom of the channel, and adjacent geomembranes are overlapped with staggered seams and heat-welded into one.

Preferably, an overflow port is provided in the partition wall, and the partition wall is made of C30 plain concrete.

Preferably, the thickness of the gravel drainage layer is 30cm-50cm.

Preferably, the permeable geotextile is laid along the length direction of the channel, and the overlapping length of adjacent permeable geotextiles is not less than 1 m.

Preferably, the bottom of the permeable blind pipe is ≥25 cm away from the bottom of the gravel drainage layer, and the permeable holes on the permeable blind pipe are distributed in a plum blossom shape.

Preferably, the blind pipe is laid horizontally.

Preferably, the laying spacing of the cotton thread is ≥60 cm, and the width of a single cotton thread is ≥10 cm and the thickness is ≥2 cm.

Preferably, the thickness of the planting soil layer is ≥50 cm.

The utility model has substantial characteristics and progress compared with the prior art. Specifically, the utility model has the following advantages:

1. The utility model provides a new sponge system for road greening projects, which can effectively relieve the drainage pressure of the road drainage system in heavy rain, and store water at the bottom to prevent it from being lost. In the case of drought and other water supply difficulties, it can continuously provide water for the plants in the soil layer to ensure the survival of the plants. At the same time, it can save part of the cost of watering green plants with a sprinkler truck.

2. The partition wall structure can increase the purification and retention effect of the biological retention pond, so that it can store a certain water level on the upper part of the planting soil layer, increase the residence time of rainwater in the biological retention pond, and then relieve the pressure of the drainage system, so that the planting soil layer can fully store precipitation; the overflow port can balance the water balance between different partition walls and avoid excessive water storage in a single partition wall.

3. Add cotton threads and blind pipes. The blind pipes are used to transfer excess water, while the cotton threads are used to introduce the water at the bottom of the gravel drainage layer into the planting soil layer to solve the problem of drought and water shortage.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a plan view of a self-priming sponge system for road engineering in the utility model.

Fig. 2 is a cross-sectional view I-I of a road engineering self-priming sponge system in the utility model.

FIG. 3 is a vertical view of a self-priming sponge system for road engineering in the utility model.

In the figure: 1. Sedimentation well; 2. Partition wall; 3. Permeable blind pipe; 4. Rainwater well; 5. Rammed soil layer; 6. Gravel drainage layer; 7. Planting soil layer; 8. Temporary water storage layer; 9. Permeable geotextile; 10. Geomembrane; 11. Water-absorbent cotton thread; 12. Rainwater pipe.

Detailed ways

The technical solution of the utility model is further described in detail below through specific implementation methods.

As shown in Figures 1 to 3, a self-priming sponge system for road engineering includes a channel, a compacted original soil layer 5, a gravel drainage layer 6 and a planting soil layer 7. The compacted original soil layer 5, the gravel drainage layer 6 and the planting soil layer 7 are laid in the channel in sequence from bottom to top. A temporary water storage layer 8 is formed at the top of the channel. A sedimentation well is also installed above the channel for sedimentation and interception of rainwater on the road surface.

A geomembrane 10 is arranged between the original soil ramming layer 5 and the gravel drainage layer 6. The geomembrane 10 is laid longitudinally along the bottom of the channel. Adjacent geomembranes are overlapped and heat-welded as a whole. Specifically, the soil layer under the membrane needs to be inspected and accepted before laying the two-fabric-one-membrane. The stone particle size in the soil material is less than 2 cm, and it does not contain sharp grass roots and stones. Slope laying control.

Before laying two cloths and one membrane on the slope, first check and measure the laying area, and transport the matching anti-seepage geomembrane to the corresponding position according to the measured size. When laying, "push and lay" is mainly carried out along the longitudinal direction of the trench bottom, and adjacent strips are overlapped with staggered seams to avoid "ten joints". Whether it is the slope or the trench bottom, the laying of geomembrane should be flat and straight, avoiding wrinkles and ripples, so that the adjacent two layers of geomembrane are aligned and overlapped. The overlap width is based on the design requirements, generally about 10cm. Control of film pressing.

Geomembrane welding adopts heat welding. The heat welding method is to heat the connected surfaces of PE geomembrane to melt the surface, and then fuse them into one through pressure.

It is best to lay the geomembrane along the longitudinal direction. When laying, the direction of each unit geomembrane should be adjusted to facilitate the welding of two units of geomembrane. After the geomembrane is laid, it should be pressed down with sandbags to prevent wind movement. The edge joints should be free of dirt, moisture, dust and other impurities.

A permeable geotextile 9 is arranged between the gravel drainage layer 6 and the planting soil layer 7. The permeable geotextile is laid along the gravel surface, and the laying direction is consistent with the advancement direction of the retention belt. The overlapping length of adjacent geotextiles is not less than 1m. If damage or holes occur during the laying process, they should be repaired in time, and the repairing materials should be the same as those of the geotextile. After the geotextile is laid, the upper filling construction should be carried out as soon as possible.

Several partition walls 2 are arranged along the length direction of the channel, and the bottom end of the partition wall 2 extends to the original soil ramming layer 5. In this embodiment, a partition wall is arranged every 10m, and the partition wall can store a certain water level on the upper part of the planting soil layer, increase the hydraulic retention time of rainwater in the biological retention pool, so that the planting soil layer can fully store precipitation, and at the same time, precipitation can infiltrate and purify into the gravel drainage layer as much as possible. At the same time, the partition wall is used to store a certain water level of the infiltrated precipitation in the gravel drainage layer, and the excess water is discharged through the blind pipe;

The partition wall is made of C30 plain concrete, with a thickness of 20cm and a concrete slump of about 180mm. The bottom of the partition wall is located on the top of the geomembrane, and the elevation of the top of the partition wall follows the elevation of the road surface. An overflow port is set in the middle of the partition wall, with a width of 50cm and a height of 10cm.

A permeable blind pipe 3 is laid along the length direction of the groove, and the permeable blind pipe 3 is buried in the gravel drainage layer 6. The pipe body of the permeable blind pipe 3 is evenly distributed with permeable holes, and the permeable blind pipe 3 is connected to the water well; the thickness of the gravel drainage layer 6 is 30cm-50cm, and the bottom of the permeable blind pipe 3 is ≥25cm away from the bottom of the gravel drainage layer 6. The permeable holes on the permeable blind pipe are distributed in a plum blossom shape, so that a part of the water can be retained in the gravel drainage layer 6 and not be discharged by the permeable blind pipe 3.

In this embodiment, the bottom of the permeable blind pipe 3 is set 25 cm above the bottom of the gravel drainage layer 6, and a DN150mm PE pipe is used. The pipe body is drilled with permeable holes every 10 cm in the longitudinal direction, and the permeable holes are arranged in a plum blossom shape. The blind pipe is wrapped with geotextile.

The permeable blind pipe 3 should not be laid with a reverse slope, and the blind pipe can be laid horizontally.

A number of absorbent cotton threads 11 are buried in the gravel drainage layer 6 and the planting soil layer 7. The thickness of the planting soil layer is ≥50 cm. The bottom ends of the absorbent cotton threads 11 penetrate into the bottom of the gravel drainage layer 6. During droughts, the water accumulated in the gravel drainage layer 5 is used to replenish water for the plants in the planting soil layer 7.

The cotton thread can be made of cotton materials such as geotextiles. The cotton thread is 10 cm wide and 2 cm thick. The cotton thread is placed horizontally 20 cm above the bottom of the planting soil layer. The two ends of the cotton thread are 30 cm away from the horizontal sides of the bioretention pool and go down to the bottom of the gravel layer. One thread is arranged every 60 cm in the longitudinal direction.

This technical solution relies on the Jiangjin Comprehensive Bonded Zone Liaison Road (Phase III of South District Avenue), the fifth longitudinal line of the expressway of the Jiangjin Comprehensive Bonded Zone Development and Construction Project. The total length of Phase III of South District Avenue is 1883.615m, and the standard road width is 44m. The specific road width is distributed as follows: 6.0m sidewalk + 2.5m bioretention ditch + 0.5m curb + 3.5m motor vehicle lane + 3.25m×2 motor vehicle lane + 0.5m curb + 5.0m median green belt + 0.5m curb + 3.25m×2 motor vehicle lane + 3.5m motor vehicle lane + 0.5m curb + 2.5m bioretention ditch + 6.0m sidewalk.

Since the road greening water supply system could not be connected to the municipal water supply network in the early stage, it was difficult to irrigate the green plants. This scheme was adopted in this bidding section. The structure of the bioretention ditch of this project is from bottom to top: compaction of the original soil layer + geomembrane + 40cm single-graded gravel drainage layer (also for water storage) + geotextile filter layer + 50cm planting soil (also for filtration) + 20cm water storage layer.

A partition wall is set up every 10-15m along the bioretention ditch. The partition wall is made of C30 plain concrete and is 20cm thick. A permeable blind pipe is passed through 25cm above the bottom of the partition wall to connect the bioretention ditches on both sides of the partition wall, so that the water in the drainage layer flows to the drainage system through the permeable blind pipe. The permeable blind pipe uses a DN150mm PE pipe with holes punched at intervals of 10cm in a plum blossom shape. The permeable blind pipe is wrapped with 200g/m2 geotextile.

The absorbent cotton strips can be made of cotton materials such as geotextiles. The cotton strips are 10 cm wide and 2 cm thick. The cotton strips are placed horizontally 20 cm above the bottom of the planting soil layer. The two ends of the cotton strips are 30 cm away from the horizontal sides of the bioretention pool and go down to the bottom of the gravel layer. One strip is placed every 60 cm in the longitudinal direction.

8.2 Implementation Effect

Greening watering should be carried out at the appropriate time according to the season, temperature and precipitation to prevent the plants from wilting and drying up. For example, on a day with high temperature and little precipitation, water the plants once in the morning and once in the afternoon.

According to Chongqing Garden Greening Pricing Standards (2018): the direct cost of sprinkler truck maintenance is 57.92 yuan per ^100m2 .

According to the road greening width of my section, 10m, the greening area per kilometer is 1000*10= ^10000m2

The direct cost of watering maintenance saved per kilometer per day is: 100*57.92=5792 yuan.

After the high temperature season from July to September, in dry weather, the plants in the green belt can be well replenished by the precipitation stored in the bioretention ditch, which effectively ensures the survival rate of the plants and greatly saves the cost of watering by sprinkler trucks. At the same time, in heavy rain weather, the water storage function of the bioretention ditch effectively relieves the pressure of some municipal drainage pipe networks.

Finally, it should be noted that: The above describes in detail the preferred implementation of this patent, but this patent is not limited to the above implementation. Various changes can be made within the knowledge scope of ordinary technicians in this field without departing from the purpose of this patent.

Claims (9)

1. The utility model provides a road engineering is from inhaling formula sponge system which characterized in that: comprises a channel, a raw soil ramming layer, a gravel drainage layer and a planting soil layer, the original soil ramming layer, the gravel drainage layer and the planting soil layer are sequentially paved in the channel from bottom to top, and a temporary water storage layer is formed at the topmost end of the channel;

A geomembrane is arranged between the original soil ramming layer and the gravel water drainage layer, and a permeable geotextile is arranged between the gravel water drainage layer and the planting soil layer;

A plurality of partition walls are arranged along the length direction of the channel, and the bottom ends of the partition walls extend to the original soil ramming layer;

The permeable blind pipes are laid along the length direction of the channel and buried in the gravel drainage layer, the pipe bodies of the permeable blind pipes are uniformly provided with permeable holes, and the permeable blind pipes are communicated with the water well;

The gravel water drainage layer and the planting soil layer are embedded with a plurality of water-absorbing cotton threads, and the bottom ends of the water-absorbing cotton threads penetrate into the bottom of the gravel water drainage layer.

2. The road engineering self-priming sponge system of claim 1, wherein: the geomembranes are longitudinally paved along the bottom of the channel, and adjacent geomembranes are overlapped in staggered joint and are thermally welded into a whole.

3. The road engineering self-priming sponge system of claim 1 or 2, wherein: and an overflow port is arranged in the partition wall, and the partition wall is made of C30 plain concrete.

4. The road engineering self-priming sponge system of claim 3, wherein: the gravel drainage layer has a thickness of 30cm-50cm.

5. The road engineering self-priming sponge system of claim 4, wherein: the permeable geotextile is paved along the length direction of the channel, and the lap joint length of the adjacent permeable geotextile is not less than 1m.

6. The road engineering self-priming sponge system of claim 5, wherein: the distance between the bottom of the water permeable blind pipe and the bottom of the gravel drainage layer is more than or equal to 25cm, and the water permeable holes on the water permeable blind pipe are distributed in a plum blossom shape.

7. The road engineering self-priming sponge system of claim 6, wherein: the blind pipe is laid horizontally.

8. The road engineering self-priming sponge system of claim 7, wherein: the laying interval of the cotton threads is more than or equal to 60cm, and the width of a single cotton thread is more than or equal to 10cm and the thickness is more than or equal to 2cm.

9. The road engineering self-priming sponge system of claim 8, wherein: the thickness of the planting soil layer is more than or equal to 50cm.