CN203890829U - Drainage facility of porous asphalt pavement - Google Patents

Abstract

The utility model discloses a porous asphalt pavement drainage facility, which comprises a pavement layer, an intermediate layer and a base layer. Along the direction of the road, water-permeable layers are arranged on both sides of the intermediate layer, and the water-permeable layer is located below the pavement layer; There are longitudinal drainage pipes, and several through holes are opened on the longitudinal drainage pipes, and the surface water of the road surface penetrates into the permeable layer through the pavement layer, and then enters the longitudinal drainage pipes through the through holes to be discharged. The porous asphalt pavement drainage facility of the utility model adopts roadside drainage pipes and graded crushed stone materials instead of drainage side ditches, and the construction process is relatively simple. According to the drainage requirements of different regions and different rainfall, its drainage function is more targeted.

Description

A drainage facility for porous asphalt pavement

technical field

The utility model relates to a design of a pavement drainage system, in particular to a design of a porous asphalt pavement drainage system. the

Background technique

Porous asphalt pavement is a pavement paved with asphalt mixture with a porosity of 18% to 25%. When it rains, the rainwater can enter the internal voids of the pavement after it falls on the pavement without forming water on the road surface. Many advantages. the

For example, the porous asphalt pavement has no water on the pavement in rainy days, which can ensure good adhesion between the tires and the pavement, greatly improves the anti-skid performance of the pavement, and prevents water drift accidents; at the same time, it can reduce water splashing and The spray improves the driving conditions and improves the visibility of driving in rainy days; it can reduce the flood peak flow on the road surface during heavy rain and reduce the pressure on the urban drainage system. the

The rainwater that enters the internal voids of the porous asphalt pavement needs to be drained from the pavement structure through the drainage system and flow into the drainage system. Therefore, it is necessary to systematically design the drainage system of the pavement structure. The current application of porous asphalt pavement in urban roads is still in the research and exploration stage. "Technical Regulations for Permeable Asphalt Pavement" CJJ/T190-2012 introduces several drainage facilities for porous asphalt pavement, one of which is to set up drainage on the side of the road One way is to discharge the surface water into the underground sewage system, and the other is to set permeable cement concrete on the side of the pavement layer, so that the surface water on the pavement can seep into the green space beside the pavement layer and permeable cement concrete. the

However, due to differences in road grades and actual conditions, the layout and design of the drainage system may be different, and a variety of drainage system designs are required to meet the requirements of different road grades, pavement structures, and road surrounding environments. the

Contents of the invention

Aiming at the defects or deficiencies of the prior art, the purpose of this utility model is to provide a novel drainage facility for porous asphalt pavement. the

For this reason, the drainage facility of the porous asphalt pavement provided by the utility model comprises a pavement layer, an intermediate layer and a base layer, along the direction of the road, a water-permeable layer is provided on both sides of the intermediate layer, and the water-permeable layer is located below the pavement layer; There are longitudinal drainage pipes, and several through holes are opened on the longitudinal drainage pipes, and the surface water of the road surface penetrates into the water-permeable layer through the pavement layer, and then enters the longitudinal drainage pipes through the through holes to be discharged. the

Preferably, the porosity of the water-permeable layer is 25%-45%. the

Preferably, the width of the water-permeable layer is 15cm-25cm. the

Preferably, a seepage barrier layer is provided between the pavement layer and the middle layer. the

Preferably, a seepage barrier layer is provided between the intermediate layer and the water-permeable layer. the

Preferably, a seepage barrier layer is provided between the water-permeable layer and the base layer. the

Preferably, the pavement drainage facilities include a horizontal drainage pipe, which communicates with the longitudinal drainage pipe, and is drained into the longitudinal drainage pipe and then discharged through the horizontal drainage pipe. the

Preferably, the total area of the through holes on the longitudinal drainage pipe is greater than 80 cm ² /linear meter.

Compared with the prior art, the utility model has the advantages of:

The drainage facility of the porous asphalt pavement of the utility model adopts roadside drainage pipes and graded crushed stone materials instead of drainage side ditches, and the construction process is relatively simple. To meet the drainage requirements of different regions and different rainfall, its drainage function is more targeted.

Description of drawings

Fig. 1 is the drainage facility structure schematic diagram of porous asphalt pavement of the present utility model;

The codes in the figure represent: 1-pavement layer, 2-intermediate layer, 3-base layer, 4-permeable layer, 5-longitudinal drainage pipe, 6-seepage barrier layer, 7-horizontal drainage pipe.

Detailed ways

The drainage facility of the porous asphalt pavement of the utility model comprises a pavement layer, an intermediate layer and a base layer. Along the road direction, a permeable layer and longitudinal drainage pipes are laid on both sides of the intermediate layer. The filling material of the permeable layer is generally open-graded crushed stone material, the void ratio of the filling material is about 25% to 45%, the maximum particle size of the filling material does not exceed 40mm, and the content of fine material below 4.75mm does not exceed 16%, 2.36mm The following fine material content should not exceed 6%. the

The pavement layer of the utility model is a porous asphalt pavement layer, which has a certain porosity and is beneficial to the infiltration of surface water. the

The longitudinal drainage pipe described in the utility model refers to the pipe laid along the road direction. The longitudinal drainage pipe is laid in the middle and lower position of the permeable layer, and a plurality of through holes are opened on the side wall not in contact with the bottom surface. The total area should be greater than 80cm ² /linear meter, so that the surface water infiltrated into the aquifer enters the vertical drainage pipe. Water is introduced into the underground drainage network system from the vertical drainage pipe into the horizontal drainage pipe.

The seepage barrier layer of the utility model can be selected from double-layer asphalt geotextiles or other water-proof materials. the

The vertical drainage pipe and the horizontal drainage pipe of the utility model can be selected polyvinyl chloride or polyethylene plastic pipes, and the diameter is 70～150mm. the

The following are specific examples provided by the inventors to further explain the technical solutions of the present invention. the

Example:

As shown in Figure 1, the drainage facility of the porous asphalt pavement of this embodiment comprises a pavement layer 1, an intermediate layer 2 and a base layer 3, and along the road direction, an about 15-25cm wide part is reserved on both sides of the intermediate layer 2 to lay a permeable layer 4 and layout vertical drainage pipe 5.

The pavement layer 1 is paved with a porous asphalt pavement with a porosity of 20%, the middle layer 2 is a conventional densely graded asphalt mixture, and the base layer 3 is cement-stabilized macadam. the

Leave about 20cm wide on both sides of the middle layer 2 to lay the permeable layer 4. The permeable layer 4 is made of water-permeable graded crushed stone material, and longitudinal drainage pipes 5 are arranged in it. The void ratio of the permeable layer 4 is 35%, and the maximum nominal grain The diameter is 31.5mm, the content of fine material below 4.75mm is 11%, and the content of fine material below 2.36mm is 3%. the

The vertical drainage pipe 5 adopts polyvinyl chloride (PVC) plastic pipe with a diameter of 95mm. The longitudinal drainage pipe 5 is provided with three rows of orifices with a total opening area of 120cm ² /long meter, and the horizontal drainage pipe 7 is made of non-perforated polyvinyl chloride (PVC) plastic pipe with a pipe diameter of 95mm.

Between the porous asphalt pavement layer 1 and the middle layer 2, the contact side of the permeable layer 4 and the middle layer 2, and the contact plane between the permeable layer 4 and the base layer 3 are all provided with a seepage barrier layer 6, and the seepage barrier layer 6 adopts a double-layer asphalt geotechnical cloth. the

When the rainwater falls on the porous asphalt pavement layer 1, the rainwater seeps into the gaps of the porous asphalt pavement, because the pavement design generally makes 1.5 to 2% of the road crown slope, and at the same time, due to the blocking of the seepage barrier layer 6, so The rainwater flows to both sides inside the porous asphalt pavement layer 1, flows into the permeable layer 4, enters the longitudinal drainage pipe 5 through the opening on the longitudinal drainage pipe 5, flows out longitudinally, and finally discharges through the horizontal drainage pipe 7. the

Claims (8)

1. a drainage facility for porous asphalt pavement, comprising pavement layer, intermediate layer and base, is characterized in that, along road direction, intermediate layer both sides are provided with water-permeable layer, and water-permeable layer is positioned at the pavement layer below; In described water-permeable layer Longitudinal drainage pipes are provided, and several through holes are opened on the longitudinal drainage pipes, and surface water on the road surface penetrates into the water-permeable layer through the pavement layer and then enters the longitudinal drainage pipes through the through holes to be discharged. 2. The drainage facility for porous asphalt pavement according to claim 1, wherein the porosity of the permeable layer is 25%-45%. 3. The drainage facility for porous asphalt pavement according to claim 1, characterized in that the width of the permeable layer is 15cm-25cm. 4. The drainage facility for porous asphalt pavement according to claim 1, characterized in that a seepage barrier layer is arranged between the pavement layer and the middle layer. 5. The drainage facility for porous asphalt pavement according to claim 1, characterized in that a seepage barrier layer is arranged between the intermediate layer and the permeable layer. 6. The drainage facility for porous asphalt pavement according to claim 1, characterized in that a seepage barrier layer is provided between the permeable layer and the base layer. 7. The drainage facility of porous asphalt pavement as claimed in claim 1, characterized in that, said pavement drainage facility comprises a horizontal drainage pipe, which is communicated with said longitudinal drainage pipe, and after being drained into the longitudinal drainage pipe, passes through Lateral drain pipes are drained. 8. The drainage facility for porous asphalt pavement according to claim 1, characterized in that the total area of the through holes on the longitudinal drainage pipe is greater than 80 cm ² /linear meter.