CN113106803B - Water-permeable pavement combined pavement structure and pavement method - Google Patents

Abstract

The utility model relates to a permeable pavement combined pavement structure and a paving method, wherein the pavement structure comprises a semi-permeable waterway unit and a permeable pavement unit which are paved in parallel, the semi-permeable waterway unit and the permeable pavement unit respectively comprise a first permeable layer, a second permeable layer and a third permeable layer which are paved from top to bottom, the third permeable layer of the semi-permeable waterway unit is paved on an original foundation, and a fourth permeable layer is also paved between the third permeable layer of the permeable pavement unit and the original foundation; wherein, the water permeability of first permeable bed, second permeable bed, third permeable bed, fourth permeable bed strengthens in proper order, and the third permeable bed of semi-permeable pavement unit communicates with the fourth permeable bed of permeable pavement unit. The invention has the advantages of simple structure, simple construction, small workload and low cost, and can realize the reutilization of rainwater resources.

Description

Water-permeable pavement combined pavement structure and pavement method

Technical Field

The patent belongs to the technical field of permeable pavements, and particularly relates to a permeable pavement combined pavement structure and a pavement method.

Background

The water resource of China is characterized by being integrally rich and small in occupied amount by people. In many areas, the situation of water shortage or water quality type water shortage exists. A large amount of surface pollutants are carried by rainwater in the processes of falling and collecting, and rivers are seriously polluted. Meanwhile, rainwater is a non-traditional water resource, rainwater infiltration can conserve underground water resources, rainwater recycling can make up for partial water resource shortage, and non-point source pollution of rivers can be reduced. Since the release of the technical guideline for sponge city construction, the construction of sponge city has been raised in China. The ultimate goal of sponge city construction is rain flood management, the comprehensive control goals of the sponge city construction include total rainwater amount control, rainwater resource utilization, rainwater pollution control and peak reduction, and the realization of the goals depends on implementation of low-impact development technology.

At present, permeable pavement is a new emerging city form of mating formation, is applied to surface course, basic unit through adopting the higher material of void fraction to under the prerequisite of guaranteeing road surface intensity and durability, make the rainwater can get into the shop front structure smoothly inside, through the basic unit that has interim store water ability, directly permeate the soil matrix down or get into shop front internal drainage pipe and discharge, thereby reach the conservation moisture, improve urban environment and improve functions such as traffic safety travelling comfort.

However, the existing water-permeable paved road surface is not designed finely, and no matter the size of the water-permeable road surface, a structural mode is adopted, so that either the water permeability is not enough to bear the goal that daily rainfall can infiltrate, or the water permeability is surplus, and waste is caused. The longitudinal structure of the whole pavement of the existing permeable pavement is the same, the construction workload is huge, and the construction cost is high; when the rainfall is large and the infiltration cannot be carried out in time, the problem of road water accumulation still exists, and potential traffic hazards exist; and the filter function of permeable pavement is low, the purification effect on rainwater is poor, the non-point source pollution reduction effect is weak, and the non-point source pollution reduction target meeting the sponge city construction requirement is difficult.

Disclosure of Invention

In view of the above analysis, the present invention aims to provide a permeable pavement combined pavement structure and a pavement method, which are used for solving one or more of the problems of the existing permeable pavement extensive implementation, single function, limited function of reducing the area source pollution and water resource waste caused by direct drainage of roof rainwater.

The purpose of the invention is realized as follows:

on one hand, the permeable pavement combined pavement structure comprises a semi-permeable pavement unit and a permeable pavement unit which are laid side by side, wherein the semi-permeable pavement unit and the permeable pavement unit respectively comprise a first permeable layer, a second permeable layer and a third permeable layer which are laid from top to bottom;

wherein, the water permeability of first permeable stratum, second permeable stratum, third permeable stratum, fourth permeable stratum strengthens in proper order, and the third permeable stratum of semi-permeable pavement unit communicates with the fourth permeable stratum of permeable pavement unit.

Furthermore, a plurality of semi-permeable pavement units are continuously paved to form a first side pavement, a plurality of permeable pavement units are continuously paved to form a second side pavement, and the first side pavement and the second side pavement form a bidirectional road.

Furthermore, the first permeable layer is laid by the brick that permeates water of polylith, has the clearance between two adjacent blocks of brick that permeate water.

Furthermore, the area of the gap accounts for 10% -30% of the area of the road surface, and gravel with the particle size of 10mm is filled in the gap.

Further, the second water permeable layer is packed by a first size of gravel, the third water permeable layer is packed by a second size of gravel, and the fourth water permeable layer is packed by a third size of gravel, the second size being greater than the first size and smaller than the third size.

Further, the first particle size is 10mm, the second particle size is 15-40mm, and the third particle size is 40-80mm.

Furthermore, one side of the permeable pavement unit, which is close to the semi-permeable pavement unit, is provided with a drainage ditch, and the depth of the drainage ditch is equal to the distance from the top surface of the first permeable layer to the top surface of the fourth permeable layer;

a water inlet pipe is laid in the drainage ditch, and a water drainage hole is formed in the top surface of the fourth permeable layer in the drainage ditch.

Furthermore, the second permeable layer, the third permeable layer and the fourth permeable layer are wrapped with permeable geotextiles.

Furthermore, a perforated pipe is laid in the fourth permeable layer and used for leading water stored in the fourth permeable layer out to a water supply point for use.

Further, the perforated pipe is wrapped with a permeable geotextile for preventing the perforation of the perforated pipe from being blocked.

Further, the thickness of the second water permeable layer is not less than 50mm, the thickness of the third water permeable layer is not less than 100mm, and the thickness of the fourth water permeable layer is 300-600mm.

Furthermore, concrete separation belts are arranged on the outer sides of the semi-permeable pavement units and/or the permeable pavement units, and the thickness of each concrete separation belt is at least larger than that of the first permeable layer.

Further, the gradient of the adjacent road surface was 2%.

On the other hand, the paving method of the water permeable paving combined pavement structure is also provided, and comprises the following steps:

determining the widths of the semi-permeable pavement unit and the thicknesses of the first permeable layer, the second permeable layer, the third permeable layer and the fourth permeable layer according to pavement design and foundation conditions;

screening gravels according to the ranges of the first particle size, the second particle size and the third particle size, and wrapping the gravels with the first particle size into a second water-permeable layer, wrapping the gravels with the second particle size into a third water-permeable layer and wrapping the gravels with the third particle size into a fourth water-permeable layer by using permeable geotextile;

excavating a first pavement space and a second pavement space, and sequentially paving a third permeable layer, a second permeable layer and a first permeable layer in the first pavement space from bottom to top to finish the paving of the semi-permeable waterway surface unit; lay fourth permeable bed, third permeable bed, second permeable bed and first permeable bed in proper order in the space of paving by the bottom up at the second, reserve when laying and establish the escape canal, escape canal and fourth permeable bed intercommunication to lay the inlet tube in the escape canal, accomplish the laying of permeable pavement unit.

Furthermore, a perforated pipe is laid inside the fourth permeable layer and connected with a drain pipe, and the drain pipe is connected with a ground water consumption point through a water pumping device.

Compared with the prior art, the invention can realize at least one of the following beneficial effects:

a) The invention provides a permeable pavement combined pavement structure, which is divided into a semi-permeable pavement unit and a permeable pavement unit, wherein the two parts of pavements have different water storage and drainage capacities, and the two parts of pavement permeable layers are communicated underground, when precipitation occurs, rainwater falling on the semi-permeable pavement unit enters a third permeable layer after being filtered by a first permeable layer and a second permeable layer, and the rainwater in the third permeable layer of the semi-permeable pavement unit overflows into the fourth permeable layer of the permeable pavement unit along with continuous infiltration of rainwater because the third permeable layer of the semi-permeable pavement unit is communicated with the fourth permeable layer of the permeable pavement unit, so that the rainwater is prevented from overflowing the top surface of the semi-permeable pavement unit, and the filtered rainwater is stored in the fourth permeable layer of the permeable pavement unit in a centralized manner, and the drainage requirement of large rainfall can be met.

b) The permeable pavement combined pavement structure provided by the invention has the advantages that the rainwater filtering effect of the multi-stage permeable layers is good, the filtered rainwater is stored in the fourth permeable layer to reach the recycling standard of domestic miscellaneous water, the perforated pipes are laid in the fourth permeable layer, so that the rainwater can be conveniently and uniformly discharged and used at water supply points, and the rainwater resource is fully utilized.

c) According to the permeable pavement combined pavement structure provided by the invention, the communication structure between the semi-permeable pavement unit and the permeable pavement unit is adopted, namely the semi-permeable pavement unit is communicated with the permeable pavement unit through the drainage ditch, and the water inlet pipe is laid in the drainage ditch, so that not only can rainwater on the pavement be received, but also the water accumulated on the pavement can be reduced; can also receive rainwater coming down from the roof; and rainwater of the semi-permeable pavement unit can be guided into the permeable pavement unit to be infiltrated together, so that the manufacturing cost is reduced.

d) The paving method of the permeable pavement combined pavement structure provided by the invention divides the pavement structure into two parts for respective construction, has simple construction and low cost, and overcomes the defects of huge construction workload, high construction cost and incapability of realizing rainwater resource reutilization of the existing permeable pavement.

e) According to the paving method of the permeable pavement combined pavement structure, the second permeable layer, the third permeable layer and the fourth permeable layer are wrapped into the square structure by the permeable geotextile, so that the construction is convenient, meanwhile, the soil can be prevented from permeating into the gravel layer to influence the porosity and permeability of the gravel layer, and meanwhile, the stability of the pavement structure can be ensured.

Drawings

In order to more clearly illustrate the embodiments of the present specification or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the embodiments of the present specification, and other drawings can be obtained by those skilled in the art according to the drawings.

FIG. 1 is a schematic plan view of a water permeable pavement composite pavement structure of the present invention;

FIG. 2 is a schematic longitudinal sectional view of the water permeable pavement composite pavement structure of the present invention;

FIG. 3 is a schematic longitudinal sectional view of the water permeable pavement combined pavement structure of the present invention;

fig. 4 is a schematic view of the connection of the perforated pipe and the drain pipe of the present invention.

Reference numerals:

1-a semi-permeable waterway unit; 2-permeable pavement units; 3-a first water permeable layer; 4-a second water permeable layer; 5-a third water permeable layer; 6-a fourth water permeable layer; 7-undisturbed foundation; 8-gravel packing; 9-a drainage ditch; 10-a water inlet pipe; 11-a water drainage hole; 12-a concrete division strip; 13-adjacent pavement; 14-permeable geotextile; 15-perforated pipes; 16-a drain pipe.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

For the purpose of facilitating understanding of the embodiments of the present application, the following description will be made in terms of specific embodiments with reference to the accompanying drawings, which are not intended to limit the embodiments of the present application.

In a specific embodiment of the present invention, as shown in fig. 1 to 3, a permeable pavement combined pavement structure is disclosed, which comprises a semi-permeable pavement unit 1 and a permeable pavement unit 2 which are laid in parallel, wherein a plurality of semi-permeable pavement units 1 are continuously laid to form a first side pavement, a plurality of permeable pavement units 2 are continuously laid to form a second side pavement, and the first side pavement and the second side pavement form a bidirectional pavement; the semi-permeable pavement unit 1 and the permeable pavement unit 2 respectively comprise a first permeable layer 3, a second permeable layer 4 and a third permeable layer 5 which are laid from top to bottom, the third permeable layer 5 of the semi-permeable pavement unit 1 is laid on an original foundation 7, and a fourth permeable layer 6 is also laid between the third permeable layer 5 of the permeable pavement unit 2 and the original foundation 7; wherein, the water permeability of first permeable stratum 3, second permeable stratum 4, third permeable stratum 5, fourth permeable stratum 6 strengthens in proper order, and the third permeable stratum 5 of semi-permeable waterway unit 1 communicates with the fourth permeable stratum 6 of permeable pavement unit 2.

When rainfall occurs, rainwater permeates vertically downwards, and rainwater falling on the permeable pavement unit 2 enters the fourth permeable layer 6 after being filtered by the first permeable layer 3, the second permeable layer 4 and the third permeable layer 5; the rainwater that falls on semi permeable pavement unit 1, through first permeable stratum 3, second permeable stratum 4 filters the back and gets into in the third permeable stratum 5, because the third permeable stratum 5 of semi permeable pavement unit 1 and the fourth permeable stratum 6 intercommunication of permeable pavement unit 2, along with the rainwater constantly infiltrates, rainwater in the third permeable stratum 5 of semi permeable pavement unit 1 spills over to in the fourth permeable stratum 6 of permeable pavement unit 2, in order to prevent that the rainwater from spilling over semi permeable pavement unit 1's top surface, concentrate through filterable rainwater and store in permeable pavement unit 2's fourth permeable stratum 6, be convenient for unified exhaust utilization, and this pavement structure is convenient for be under construction, construction cost reduces.

Since the roof rainwater is considered as a rainwater resource with better water quality, if the roof rainwater is directly discharged into the municipal pipe network, the rainwater resource is wasted, and the peak load of the rainwater pipe network is increased; if the waste water is directly dispersed to the ground, the waste water is polluted by ground pollutants, and the waste water needs to be purified again, which is unreasonable. Therefore, by combining the permeation function of the permeable pavement, clean roof rainwater can be introduced into the permeable pavement structure with a large area through the introducing pipe, and then is further treated and then is infiltrated or collected for recycling.

In a preferred embodiment of this embodiment, one side of permeable pavement unit 2 close to semi-permeable pavement unit 1 is equipped with escape canal 9, and the degree of depth of escape canal 9 equals the top surface of first permeable layer 3 to the top surface distance of fourth permeable layer 6, because the infiltration rate of rainwater is slower, has laid inlet tube 10 in the escape canal 9 for collect the roofing rainwater and purify the infiltration to here, the top surface of the fourth permeable layer 6 that is located escape canal 9 is equipped with outlet 11. When the rain is large, part of the roof rain water can enter the structural layer of the permeable pavement combined pavement through the water inlet pipe 10 and the drainage ditch, and the drainage holes are used as the infiltration channels, so that the infiltration speed is increased.

An optional implementation mode of this embodiment, first permeable bed 3 adopts the permeable pavement, preferably adopts the brick that permeates water, first permeable bed 3 is laid by the polylith brick that permeates water, has the clearance between two adjacent blocks of bricks that permeate water, and the clearance area accounts for 10% -30% of road surface area, and this parameter setting increases the permeability under the condition of guaranteeing road surface structural stability.

Although the brick that permeates water has certain water permeability, can accelerate the infiltration of water for traditional brick to reduce the deposit of ponding, nevertheless because there is the clearance between the brick that permeates water, long-time the use can make and persist impurity between the clearance, influence water permeability. Therefore, gravel packs 8 are arranged in gaps among the water permeable bricks, particularly gravel with the particle size of 10mm is filled in the gaps, so that the gaps are prevented from being filled with sundries, and the water permeability of the water permeable bricks is guaranteed.

In an alternative embodiment of this embodiment, the second water permeable layer 4 is packed with gravel of a first size, the third water permeable layer 5 is packed with gravel of a second size, and the fourth water permeable layer 6 is packed with gravel of a third size, the second size being larger than the first size and smaller than the third size. The permeable layer is not doped with other filtering materials, so that the filtering speed is prevented from being influenced, and in addition, gravel is the most common building material, so that the construction burden is not increased, the material source is wide, and the cost is low.

Furthermore, the first particle size is 10mm, the second particle size is 15-40mm, and the third particle size is 40-80mm, and the parameter setting not only ensures the filtering effect, but also has good filtering effect.

In this embodiment, permeable pavement unit 2's first permeable stratum 3, second permeable stratum 4, third permeable stratum 5 are the same with semi-permeable pavement unit 1's first permeable stratum 3, second permeable stratum 4, third permeable stratum 5's thickness, are convenient for be under construction.

Considering that the thickness and the particle diameter of different permeable layers influence the steadiness and the filterability on ground, the thickness of second permeable layer 4 is not less than 50mm, the thickness of third permeable layer 5 is not less than 100mm, the thickness of fourth permeable layer 6 is 300-600mm, this thickness parameter combines the particle diameter parameter design of gravel, not only can promote ground steadiness and filtering quality, can also make the fourth permeable layer have enough big rainwater storage space, guarantee the reliability of road surface drainage performance.

In an optional implementation manner of this embodiment, the second permeable layer 4, the third permeable layer 5, and the fourth permeable layer 6 are all wrapped with permeable geotextiles 14, and on one hand, the permeable geotextiles 14 can prevent soil in the original soil from entering a gravel layer to block a system, which leads to poor filtering and permeation effects, and simultaneously ensure that water can permeate into the original soil to permeate downwards to conserve a water source; on the other hand, utilize permeable type geotechnological cloth to wrap up into square structure with second permeable bed, third permeable bed and fourth permeable bed, convenient construction can also guarantee pavement structure's stability simultaneously.

In order to realize the reuse of rainwater resources, a perforated pipe 15 is laid inside the fourth permeable layer 6, the perforated pipe 15 is connected with a drain pipe 16, as shown in fig. 4, the drain pipe 16 is connected with a ground water consumption point through a pumping device, so that water stored in the fourth permeable layer 6 is led out to the water consumption point for use, and the reuse of rainwater resources is realized.

Further, the perforated pipe 15 is wrapped with a permeable geotextile for preventing the clogging of the perforated pipe 15.

In this embodiment, a concrete division strip 12 is provided outside the semi-permeable pavement unit 1 and/or the permeable pavement unit 2.

For example, as shown in fig. 1, if the border of the left semi-permeable pavement unit 1 is a building side, the thickness of the left concrete partition 12 is greater than the sum of the thicknesses of the first permeable layer 3, the second permeable layer 4 and the third permeable layer 5, that is, the concrete partition 12 is laid against the edge of the interlayer permeable layer, the concrete partition 12 is directly laid on the undisturbed foundation 7, the top surface of the concrete partition 12 is flush with the surface of the first permeable layer 3, and the concrete partition 12 with the thickness can effectively prevent rainwater from laterally permeating through the permeable layer, so as to avoid affecting the building.

If the place of the right side permeable pavement unit 2 is connected to other roads or greenbelts, the thickness of the concrete partition strip 12 on the right side is at least larger than that of the first permeable layer 3, so that the sides of the first permeable layer 3 to the fourth permeable layer 6 are not required to be blocked, and rainwater can permeate from the side of the second permeable layer 4 or the third permeable layer 5 to flow out. Of course, the concrete strips 12 can also completely block the side edges of the first to fourth permeable layers 3-6, that is, the thickness of the concrete strips 12 is greater than the sum of the thicknesses of the first permeable layer 3, the second permeable layer 4, the third permeable layer 5 and the fourth permeable layer 6, the concrete strips 12 on the right side are laid on the original foundation 7, the top surface of the concrete strips 12 is flush with the surface of the first permeable layer 3, and rainwater can only seep downwards but not laterally seep.

An optional implementation of this embodiment, the periphery of concrete median 12 is for closing on road surface 13, and the slope that closes on road surface 13 is 2%, and the rainwater on the road surface of being convenient for in time drains away, prevents surface gathered water when rainfall is big.

It should be noted that, in this embodiment, both the semi-permeable pavement unit 1 and the permeable pavement unit 2 may be used independently or in combination, and in particular, the two combinations of the "permeable pavement unit 2+ the permeable pavement unit 2" and the "semi-permeable pavement unit 1+ the permeable pavement unit 2" are used.

For the road surface with low original soil permeability, the road surface structure of the permeable pavement unit 2 and the permeable pavement unit 2 is adopted, so that the water permeability is good, the underground water storage space is large, and the water accumulation on the road surface is effectively prevented.

For the road surface with high original soil permeability, a combined road surface structure of the semi-permeable waterway surface unit 1 and the semi-permeable waterway surface unit 1 can be adopted, so that the construction cost is low and the construction is convenient; the road surface structure of the semi-permeable pavement unit 1+ the permeable pavement unit 2 'is preferably adopted, the semi-permeable pavement unit is suitable for the pavement which can also meet the permeation requirement through semi-permeation, and the manufacturing cost is low compared with the road surface structure of the permeable pavement unit 2+ the permeable pavement unit 2'.

The embodiment also discloses a paving method of the permeable pavement combined pavement structure, the combined pavement structure adopts two combinations of the semi-permeable pavement unit 1 and the permeable pavement unit 2, and the paving method comprises the following steps:

the method comprises the following steps: determining the widths of the semi-permeable pavement units 1 and the permeable pavement units 2 and the thicknesses of the first permeable layer 3, the second permeable layer 4, the third permeable layer 5 and the fourth permeable layer 6 according to pavement design and foundation conditions;

step two: screening gravels according to the ranges of the first particle size, the second particle size and the third particle size, and wrapping the gravels with the first particle size into a second water-permeable layer 4, wrapping the gravels with the second particle size into a third water-permeable layer 5 and wrapping the gravels with the third particle size into a fourth water-permeable layer 6 by using a permeable geotextile 14;

step three: excavating a first pavement space and a second pavement space, and paving a third permeable layer 5, a second permeable layer 4 and a first permeable layer 3 in the first pavement space from bottom to top in sequence to complete the paving of the semi-permeable pavement unit 1; lay fourth permeable bed 6, third permeable bed 5, second permeable bed 4 and first permeable bed 3 in proper order in the space from bottom to top is mated formation to the second, reserve when laying and establish escape canal 9, escape canal 9 communicates with fourth permeable bed 6 to lay the inlet tube 10 that is used for collecting the roofing rainwater in escape canal 9, accomplish laying of permeable pavement unit 2.

In the second step, a perforated pipe 15 is laid inside the fourth permeable layer 6, and the perforated pipe 15 is connected with a drain pipe 16; the drain pipe 16 is connected to a ground water supply point through a water pumping device.

Compared with the prior art, the permeable pavement combined pavement structure and the pavement method provided by the embodiment at least have the following beneficial effects:

1. the construction method is characterized in that the pavement structure is divided into two parts to be constructed respectively, the two parts of pavements have different water storage and drainage capacities, the two parts of pavement permeable layers are communicated underground, when precipitation occurs, rainwater falling on the semi-permeable pavement unit enters the third permeable layer after being filtered by the first permeable layer and the second permeable layer, the third permeable layer of the semi-permeable pavement unit is communicated with the fourth permeable layer of the permeable pavement unit, along with continuous infiltration of the rainwater, the rainwater in the third permeable layer of the semi-permeable pavement unit overflows into the fourth permeable layer of the permeable pavement unit, so that the rainwater is prevented from overflowing the top surface of the semi-permeable pavement unit, the filtered rainwater is stored in the fourth permeable layer of the permeable pavement unit in a centralized manner, the drainage requirement of large rainfall can be met, the construction is simple, the cost is low, and the defects that the construction workload is huge, the construction cost is high and the rainwater resource reutilization cannot be realized in the existing permeable pavement are overcome.

2. The rainwater filter effect on multistage permeable stratum is good, and the rainwater reservoir after filtering lays the perforated pipe in fourth permeable stratum, is convenient for unified discharge confession water spot uses, make full use of rainwater resource in fourth permeable stratum.

3. Utilize infiltration type geotechnological cloth to wrap up into square structure with second permeable bed, third permeable bed and fourth permeable bed, convenient construction can also prevent simultaneously that earth infiltration from getting into the gravel layer, influences the porosity and the permeability of gravel layer, can also guarantee road surface structure's stability simultaneously.

4. The semi-permeable pavement unit can play a role in preliminarily reducing pollution, the permeable pavement unit is suitable for the pavement with high rainwater discharge water quality requirement, recycling requirement or low soil permeability, equivalent to soil replacement at the bottommost layer and increased permeation rate, and the three-layer structure of the second permeable layer, the third permeable layer and the fourth permeable layer can effectively purify rainwater to reach the recycling standard of domestic miscellaneous water.

5. The communication structure between the semi-permeable waterway surface unit and the permeable pavement unit is characterized in that the semi-permeable waterway surface unit 1 is communicated with the permeable pavement unit through a drainage ditch, and a water inlet pipe is laid in the drainage ditch, so that the semi-permeable waterway surface unit can receive rainwater on a pavement and reduce water accumulated on the pavement; can also receive rainwater falling from the roof; the rainwater of the semi-permeable waterway surface unit can be guided into the permeable pavement unit to be infiltrated together, so that the manufacturing cost is reduced.

The above-mentioned embodiments, objects, technical solutions and advantages of the present application are described in further detail, it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present application, and are not intended to limit the scope of the present application, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present application should be included in the scope of the present application.

Claims (4)

1. The permeable pavement combined pavement structure is characterized by comprising a semi-permeable pavement unit (1) and a permeable pavement unit (2) which are laid side by side, wherein the semi-permeable pavement unit (1) and the permeable pavement unit (2) respectively comprise a first permeable layer (3), a second permeable layer (4) and a third permeable layer (5) which are laid from top to bottom, the third permeable layer (5) of the semi-permeable pavement unit (1) is laid on an original foundation (7), and a fourth permeable layer (6) is further laid between the third permeable layer (5) of the permeable pavement unit (2) and the original foundation (7);

the water permeability of the first permeable layer (3), the second permeable layer (4), the third permeable layer (5) and the fourth permeable layer (6) is sequentially enhanced, and the third permeable layer (5) of the semi-permeable pavement unit (1) is communicated with the fourth permeable layer (6) of the permeable pavement unit (2);

the first permeable layer (3) is laid by a plurality of permeable bricks, and a gap is formed between every two adjacent permeable bricks;

the area of the gap accounts for 10% -30% of the area of the pavement, and gravel with the particle size of 10mm is filled in the gap;

the second water-permeable layer (4) is packed by gravel of a first particle size, the third water-permeable layer (5) is packed by gravel of a second particle size, the fourth water-permeable layer (6) is packed by gravel of a third particle size, and the second particle size is larger than the first particle size and smaller than the third particle size;

the first particle size is 10mm, the second particle size is 40mm, the third particle size is more than 40mm and less than or equal to 80mm;

the thickness of the second permeable layer (4) is not less than 50mm, the thickness of the third permeable layer (5) is not less than 100mm, and the thickness of the fourth permeable layer (6) is 300-600mm;

a drainage ditch (9) is arranged on one side, close to the semi-permeable pavement unit (1), of the permeable pavement unit (2), the semi-permeable pavement unit (1) is communicated with the permeable pavement unit (2) through the drainage ditch (9), and the depth of the drainage ditch (9) is equal to the distance from the top surface of the first permeable layer (3) to the top surface of the fourth permeable layer (6);

a water inlet pipe (10) is laid in the drainage ditch (9).

2. The permeable pavement combined pavement structure according to claim 1, characterized in that the second permeable layer (4), the third permeable layer (5) and the fourth permeable layer (6) are wrapped with permeable geotextiles (14).

3. The water-permeable pavement structure according to claim 2, characterized in that the fourth water-permeable layer (6) is internally laid with a perforated pipe (15), and the perforated pipe (15) is wrapped with a permeable geotextile (14).

4. A method of paving a water permeable pavement structure according to any one of claims 1 to 3, comprising the steps of:

determining the widths of the semi-permeable pavement units (1) and the permeable pavement units (2) and the thicknesses of the first permeable layer (3), the second permeable layer (4), the third permeable layer (5) and the fourth permeable layer (6) according to pavement design and foundation conditions;

screening gravels according to the ranges of the first particle size, the second particle size and the third particle size, and wrapping the gravels with the first particle size into a second water-permeable layer (4), wrapping the gravels with the second particle size into a third water-permeable layer (5) and wrapping the gravels with the third particle size into a fourth water-permeable layer (6) by utilizing permeable geotextiles (14); wrapping the second permeable layer (4), the third permeable layer (5) and the fourth permeable layer (6) into a square structure by using permeable geotextile;

excavating a first pavement space and a second pavement space, and sequentially paving a third permeable layer (5), a second permeable layer (4) and a first permeable layer (3) in the first pavement space from bottom to top to finish the paving of the semi-permeable pavement unit (1); lay fourth permeable bed (6), third permeable bed (5), second permeable bed (4) and first permeable bed (3) in proper order in the space is mated formation to the second, reserve when laying and establish escape canal (9), escape canal (9) and fourth permeable bed (6) intercommunication to lay inlet tube (10) in escape canal (9), accomplish the laying of permeable pavement unit (2).

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