CN209836713U - A hard road with a modified permeable structure - Google Patents

Abstract

The utility model discloses a stereoplasm road with structure of permeating water of modification relates to permeable road construction technical field, include: paving a hard pavement, wherein the top surface is obliquely arranged; the water collecting module is arranged at the lower side of the hard pavement and used for collecting and draining rainwater; the water seepage layer is paved below the hard pavement; and the water permeating pipeline guides water in the water collecting module to the water permeating layer. The utility model adopts the mode of collecting firstly and then permeating, effectively intercepts large-particle pollutants in water, and has better water permeability compared with the traditional water permeable paving; the bottom water storage layer has a certain absorption function, most of the surface water is removed and treated, and urban waterlogging disasters are effectively prevented; maintenance cost is lower and the clearance is convenient, fine overcome the tradition easily block up of mating formation of permeating water, rinse the trouble drawback.

Description

A hard road with a modified permeable structure

technical field

The utility model relates to the technical field of permeable road construction, in particular to a hard road with a modified permeable structure.

Background technique

With the development of the city, hard pavement is used as the most important brick pavement in the area other than buildings and surrounding greening. The use of large areas has led to increased surface runoff, serious water accumulation on the road, and frequent occurrence of urban waterlogging and non-point source pollution. phenomenon has received great attention. Since the concept of "sponge city" was put forward, the permeable pavement system, as an important source control technology of this concept, has been widely used in engineering practice.

The current permeable pavement is a pavement system with fully permeable or semi-permeable pavement. It is generally believed that its structure is divided into four parts: the surface layer, the base layer, the sub-base layer and the cushion layer from top to bottom. According to the different main materials of the surface layer, it can be roughly divided into paving methods such as permeable bricks, permeable asphalt, and permeable concrete. Permeable pavement has good water permeability, water retention and ventilation. Studies have shown that the permeable pavement system can effectively meet the requirements of "seepage" and "storage" in the concept of "sponge city", and can accelerate the infiltration of rainwater, Slow down the confluence of rainwater, directly reduce the flow of urban surface runoff, and replenish groundwater in a timely manner, thereby effectively preventing urban waterlogging, land subsidence, and groundwater pollution. A large number of experimental data show that permeable pavement has adsorption and other functions, can effectively intercept pollutants in the process of absorbing and storing surface runoff, significantly reduce the concentration of pollutants in runoff, and meet the preliminary purification requirements of road surface water.

The patent document whose publication number is CN 205636402U discloses a pavement deflection-resistant permeable pavement, which is sequentially provided with a soil base, a cushion layer, a graded crushed stone layer, an ATPB permeable base, a permeable asphalt surface, and a permeable asphalt pavement. The surface layer, the soil base is an inorganic binder stabilized soil subbase, the cushion is a sand cushion, and the graded gravel layer is an inorganic binder stabilized gravel base composed of porous cement stabilized gravel. The ATPB permeable base layer is asphalt stabilized gravel with large voids, the permeable asphalt surface is permeable asphalt concrete, the sub-base layer is made of subgrade soil sandy soil clay, and the permeable asphalt surface layer is made of ceramic crushed stones with a shape of mostly right angles and obtuse angles. blocks as non-slip aggregate. The above-mentioned pavement can adapt to various harsh weather conditions, has good waterproof performance, and can effectively prevent rainwater from penetrating into the cement pavement and prevent the cement pavement from being prematurely damaged.

However, when permeable pavement is gradually applied to some large public buildings in the city, its problems have gradually emerged. While permeable pavement has good water permeability, its mechanical properties are lower than that of ordinary hard pavement. The low strength makes permeable pavement only suitable for low-load sites such as sidewalks and parking lots; due to the current The permeable pavement maintenance technology is still immature, and the main method is to wash it with a high-pressure water gun. As a result, the permeable pavement is easily blocked by dust and other impurities, and the service time has a certain number of years. decline. Generally speaking, the permeable pavement at this stage has problems such as easy clogging, poor durability, small scope of application, relatively high cost, and lack of systematic cognition and systematic specifications.

Utility model content

The utility model provides a hard road with a modified water-permeable structure, which solves the problems of poor water permeability and easy generation of pavement water while retaining the strength and hardness of the traditional hard road, and to a certain extent It improves the situation that the permeable pavement is difficult to clean and easy to clog.

A hard road with a modified permeable structure comprising:

Hard pavement pavement, the top surface is inclined;

The water collection module is arranged on the lower side of the hard pavement to collect and discharge rainwater;

Also includes:

A water seepage layer is laid under the hard pavement pavement;

The permeable pipeline guides the water in the water collection module to the water seepage layer.

The utility model lays permeable pipelines under traditional hard roads. After the rainwater on the road surface is collected by the water collection module, it infiltrates into the permeable layer through the blind pipe to filter and retain the rainwater, and then collects and discharges it through the bottom drainage ditch.

In order to facilitate installation, preferably, the permeable pipeline is a blind pipe. As the preferred material for water seepage in the drainage soil, the blind pipe has extremely high surface water seepage capacity and internal water flow capacity, high compressive strength, and excellent ability to adapt to deformation; it has good chemical inertness, and can be used in soil water Never degrade, anti-aging, anti-ultraviolet, high temperature resistance, corrosion resistance, can maintain permanent material without change; plastic blind tube is light in weight, easy to cut, convenient for construction and installation, and the filter membrane of the blind tube can be selected according to different soil conditions , fully meet the different needs of various projects, and avoid the disadvantage of a single uneconomical filter membrane product; compared with other pipelines and equipment, under the same collection and drainage effect, the material cost, transportation cost, construction cost of plastic blind pipe The cost is more economical and the overall cost is lower. At the same time, perforated plastic diversion pipes, hard permeable pipes, seepage drainage boards, seepage drainage pipes and other seepage and drainage pipes can be used, which have a certain compressive strength and can meet the requirements of stable penetration.

In order to improve the water permeability effect and uniformity of water permeability, preferably, the blind pipe is perpendicular to the extending direction of the hard road and has a length covering the width of the road.

In order to improve the water penetration effect, preferably, the blind pipe adopts a perforated diversion pipe with an opening ratio of 3% to 10%, and the perforated diversion pipe is wrapped with a 10-mesh to 30-mesh nylon filter. Ensure that the sustainable utilization and permeability of the blind pipe can meet the requirements of practical application.

The blind pipe adopts the perforated diversion pipe of De60~De100, and the distance between adjacent perforated diversion pipes is 1500~3000mm.

The water seepage layer is to realize the requirements of "seepage" and "storage" of road rainwater in the "sponge city", preferably, the water seepage layer includes a water seepage soil layer. Water-permeable soil is easy to obtain materials, that is, sandy soil with a permeability coefficient >5×10 ^-6 m/s, which ensures that rainwater can infiltrate smoothly to replenish groundwater, and has a certain interception effect on large particle pollutants in water.

In order to ensure the stability of the roadbed, preferably, the water seepage layer further includes a gravel cushion layer above the water seepage soil layer for installing the water seepage pipeline.

In order to improve the filtering and water storage effect, preferably, the water seepage layer further includes a water filter layer located below the water seepage soil layer. After the road rainwater is initially filtered through the drainage ditch, it infiltrates into the soil through the blind pipe, accumulates and discharges in the filter layer, which improves the SS removal rate of the rainwater. The porosity of the filter layer is 35% to 45%, and it is generally paved with gravel and ceramsite, and the effective particle size is greater than 80%, so as to ensure that it has a certain water storage capacity, and at the same time improve the SS removal rate and effectively remove pollution in rainwater things.

Preferably, a secondary filter layer is provided between the water-permeable soil layer and the water filter layer. The secondary filter layer performs secondary filtration on the surface runoff infiltrating into the aquifer to prevent impurities from clogging the gaps in the gravel layer and affecting the water storage efficiency of the aquifer. The secondary filter layer mostly uses geotextiles.

In order to ensure the strength of the hard pavement, preferably, the pavement of the hard pavement includes:

Granite pavement, the top face slopes outward;

dry hard cement mortar, located below the granite pavement;

The concrete pad is located under the dry hard cement mortar.

Concrete cushion and dry hard cement mortar are added above the crushed stone layer, and sesame gray granite lychee surface is laid on the surface. The traditional hard pavement paving method is adopted to ensure that the modified pavement permeable facilities can meet the hardness and strength requirements of traditional hard roads.

The function of the water collection module is to collect rainwater in various forms. In order to facilitate installation and improve the effect of rainwater filtration, preferably, the water collection module includes:

gutters opening below the lower side of said hard pavement;

Drain cover plate, which covers the opening of the drain and is provided with a water hole;

a filter layer arranged above the drain cover;

The cobblestone layer is laid on the filter layer.

The key point of the utility model is to make the traditional hard pavement have good water permeability and stagnation effect, keep a certain slope during the laying of the hard pavement, and set a drainage ditch on the edge of the downhill slope, and lay geotechnical engineering on the top of the drainage ditch. Cloth and pebbles are used to intercept large particles of impurities in the initial rainwater to avoid blockage and damage to the drainage ditch and subsequent devices; a blind pipe is installed at the bottom of the drainage ditch and buried in the gravel layer, and the rainwater is filtered through the drainage ditch Into the dead leg, the gravel layer infiltrates into the cohesive soil layer. The gravel layer has a good supporting and protective effect on the dead leg. In addition, the gravel layer has a large porosity, which is more conducive to the infiltration of rainwater in the dead leg. After the rainwater passes through the clay layer, it is filtered through the geotextile and enters the gravel filter layer and the ceramsite water storage layer. After the rainwater is collected and retained, it is discharged to the designated area by the drainage ditch for rainwater recycling and secondary use.

The beneficial effects of the utility model:

(1) The utility model adopts the method of collecting first and then infiltrating, effectively intercepting large particle pollutants in water, and has better or even better water permeability than traditional permeable paving.

(2) The aquifer at the bottom of the utility model has a certain absorptive effect, clears and treats most of the road surface water, and effectively prevents the occurrence of urban waterlogging disasters. At the same time, it can improve the SS removal rate and effectively remove pollutants in rainwater.

(3) The maintenance cost of the utility model is low and the cleaning is convenient, which well overcomes the drawbacks of the traditional permeable paving which is easy to block and troublesome to clean.

Description of drawings

Fig. 1 is a schematic cross-sectional structure diagram of a hard road with a modified permeable structure of the present invention.

Fig. 2 is a schematic plan view of the hard road with a modified permeable structure of the present invention.

Among them, 1. Garage roof rigid protective layer; 2. Water filter layer; 3. Geotextile; 4. Water-permeable soil layer; 5. Gravel cushion; Cement mortar; 9. Granite pavement; 10. Drainage ditch; 11. Drainage ditch cover; 12. Geotextile; 13. Pebbles.

Detailed ways

As shown in Figures 1 and 2, the hard road with modified permeable structure in this embodiment includes: garage roof rigid protective layer 1, water filter layer 2, geotextile 3, water permeable soil layer 4, gravel cushion layer 5 , blind pipe 6, concrete cushion 7, dry hard cement mortar 8, granite pavement 9, drainage ditch 10, drainage ditch cover 11, geotextile 12 and cobblestone 13.

When the water flow accumulates on the road, it gradually flows to the drainage ditch 10 through the slight slope of the granite road surface 9, and the drainage ditch cover 11 is covered with geotextiles 12 and cobblestones 13, and the large particles of impurities in the accumulated water are filtered and removed by the cobblestones 13 and geotextiles 12 Then enter the drainage ditch 10, and gradually infiltrate the gravel cushion layer 5 through several blind pipes 6 at the bottom of the drainage ditch 10, thereby infiltrating downward into the water-permeable soil layer 4. The above is the drainage function of this embodiment, which meets the "sponge city" seepage " requirements.

After the pavement water is re-filtered by the water-permeable soil layer 4 and the geotextile 3, the stagnant water is stored in the filter layer 2, and finally collected through the bottom drainage ditch, effectively achieving the regulation, storage and discharge of rainwater.

In this embodiment, a water filter layer 2 with a porosity of about 35%-45% is laid on the rigid protective layer 1 of the impermeable garage roof. It has a certain water storage capacity, and at the same time improves the SS removal rate and effectively removes pollutants in rainwater. The water filter layer 2 has a water storage function and may also be called an aquifer.

A geotextile 3 is laid on the aquifer to filter the surface runoff penetrating into the aquifer for a second time, so as to prevent impurities from clogging the gaps in the gravel layer and affecting the water storage efficiency of the aquifer.

Water-permeable soil layer 4 adopts water-permeable soil, that is, sandy soil, with a permeability coefficient >5×10 ^-6 m/s, to ensure that rainwater can infiltrate smoothly to replenish groundwater, and to have a certain interception effect on large particle pollutants in water.

A gravel cushion 5 is laid on the top of the water-permeable soil layer 4 to ensure the stability of the subgrade, and a blind pipe 6 is buried in the gravel layer 5. The blind pipe 6 adopts a perforated diversion pipe with an opening ratio of 5% and the diversion rate is 5%. The outside of the tube is wrapped with 18-mesh nylon filter to ensure that the sustainable use and permeability of the blind tube 6 can meet the requirements of practical use.

The blind pipe 6 adopts the perforated diversion pipe of De75, and the distance between adjacent perforated diversion pipes is 2000mm.

Concrete cushion 7 and dry hard cement mortar 8 are added above the crushed stone cushion 5, and sesame gray granite lychee surface is laid on the surface. The paving method of traditional hard pavement is adopted to ensure that the permeable facilities of the modified pavement can meet the hardness and Strength needs.

Of course, the focus of this scheme is to make the traditional hard pavement have good water permeability and stagnation effects. The specific implementation is that this scheme retains a certain slope during the laying of the hard pavement, and sets drainage ditches 10 on the edge of the downhill slope. , geotextile 12 and pebbles 13 are laid on the top of drainage ditch 10, which are used to intercept large particles of impurities in the initial rainwater, avoiding blockage and damage of drainage ditch 10 and subsequent devices; 6 Buried in the gravel cushion 5, the rainwater is filtered by the drainage ditch 10 and then enters the blind pipe 6. The gravel cushion 5 infiltrates into the water-permeable soil layer 4, and the gravel cushion 5 has good support and protection for the blind pipe In addition, the crushed stone cushion 5 has a larger porosity, which is more conducive to the infiltration of rainwater in the blind pipe. Rainwater passes through the permeable soil layer 4 and is filtered through the geotextile 3 before entering the water filter layer 2. After the rainwater is collected and retained, it is discharged to the designated area by the drainage ditch for rainwater recovery and secondary use.

In order to obtain reliable test data, a flow meter is installed at the water outlet point, and different rainfall and rainfall duration are simulated with different water outlet flow and outflow time, and the water outlet time and water outlet amount in the well are checked under the observation control experiment to determine the two kinds of water permeability. Comparison of infiltration rate and water permeability of pavement.

Three sampling ports are arranged at different buried depths at the end of the blind pipe 6 of the present embodiment (the end away from the drain 10), 1# is located in the gravel layer at the end of the dead pipe 6, and 2# is located at the end of the blind pipe 6. At the junction of the gravel cushion layer 5 below and the permeable soil layer 4, 3# is located in the middle of the permeable soil layer 4 directly below the end of the blind pipe 6. By observing the water quality of the infiltrated water at different sampling ports, that is, the ss removal rate and the soil volume The performance comparison of permeable pavement was obtained by using parameters such as water content. In order to achieve the purpose of the control experiment, two sets of sampling ports are set at the same buried depth on one side of the drainage ditch 10 in this embodiment, and the seepage contrast between the beginning end and the end surface runoff of the blind pipe 6 is observed. Corresponding sampling ports can also be set on the side of the traditional permeable pavement to ensure the reliability of the control experiment.

In the test, a PVC diversion pipe was installed in the permeable soil layer 4 above the filter layer 2, and the water flow entered the filter well along the pipe, and the ceramsite bag and gravel layer wrapped with nylon mesh were laid in the well, and the water flow passed through the filter and infiltrated into the filter well In the crushed stone filter layer and ceramsite layer on both sides, when the water flow reaches a certain intensity, the aquifer of the experimental facility reaches a full load state, and the rich water flow will overflow out of the aquifer, and be discharged into the outlet through the diversion pipe The water pump is pumped out, and the relevant parameters of the water storage performance of the aquifer can be obtained through multiple test calculations, which are widely used in actual living places with different needs.

In practical application, this embodiment can be used as a supplementary measure for traditional permeable pavement in areas such as sidewalks, squares, or green pavement around buildings. The hardness and strength are stronger than traditional pavements; The adsorption and filtration of the bag and the water storage capacity of the gravel layer can achieve the effective discharge and absorption of rainwater.

In addition, three filtrations are performed during the operation of this embodiment to effectively intercept and initially purify the suspended particles (SS) in the rainwater runoff, thereby reducing the pollution of the receiving water body by the outflow from the end of the urban rainwater drainage system.

Compared with traditional permeable pavement, this embodiment can reduce the manpower and material resources for road cleaning and maintenance, increase the durability and service life of the road surface, and reduce the cost of use and maintenance. It will become an important measure in the concept of "sponge city".

To sum up, in this embodiment, the dead pipe 6 is laid under the traditional hard road. After the rainwater on the road is collected through the drainage ditch 10, it infiltrates into the soil through the blind pipe 6, and a water filter layer 2 is laid under the water permeable soil layer 4. It is used to filter and retain rainwater, and then collect and discharge it through the bottom drainage ditch. While retaining the strength and hardness of traditional hard roads, it solves the problems of poor water permeability and easy generation of pavement water, and improves the road to a certain extent. The permeable pavement is difficult to clean and easy to block. At the same time, the road rainwater is initially filtered through the drainage ditch, and then seeps into the soil through the blind pipe, and is accumulated and discharged in the ceramsite layer and gravel layer, which improves the SS removal rate of rainwater.

Claims (10)

1. A rigid roadway with a modified water permeable structure comprising:

paving a hard pavement, wherein the top surface is obliquely arranged;

the water collecting module is arranged at the lower side of the hard pavement and used for collecting and draining rainwater;

it is characterized by also comprising:

the water seepage layer is paved below the hard pavement;

and the water permeating pipeline guides water in the water collecting module to the water permeating layer.

2. The hard road with the modified water permeable structure according to claim 1, wherein the water permeable pipe is a blind pipe.

3. The rigid road with the modified water permeable structure according to claim 2, wherein the blind pipe is perpendicular to the extension direction of the rigid road and has a length covering the width of the rigid road.

4. The hard road with the modified water permeable structure according to claim 2, wherein the blind pipe is a perforated draft tube, the opening rate is 3% -10%, and a nylon filter screen with 10-30 meshes is wrapped outside the perforated draft tube.

5. The hard road with the modified permeable structure of claim 1, wherein the permeable layer comprises a permeable soil layer.

6. The hard road with the modified water permeable structure of claim 5, wherein the water permeable layer further comprises a gravel cushion layer above the water permeable soil layer for installing the water permeable pipeline.

7. The hard road with the modified water permeable structure of claim 6, wherein the water permeable layer further comprises a water filtration layer located below the water permeable soil layer.

8. The hard road with the modified water permeable structure according to claim 6, wherein a secondary filter layer is arranged between the water permeable soil layer and the water filtering layer.

9. The hard road with the modified water permeable structure according to claim 1, wherein the hard pavement comprises:

a granite pavement, the top surface of which inclines outwards;

the dry and hard cement mortar is positioned below the granite pavement;

and the concrete cushion layer is positioned below the dry and hard cement mortar.

10. The hard road with modified water permeable structure of claim 1, wherein the water collection module comprises:

a drainage ditch having an opening located below a lower side of the hard road surface pavement;

the drainage ditch cover plate covers the opening of the drainage ditch and is not provided with water through holes;

a filter layer disposed above the drain cover plate;

and the goose soft stone layer is laid on the filter layer.