CN209759918U - A Pavement Structure Suitable for Sponge City - Google Patents

Abstract

A pavement structure suitable for sponge cities, related to the technical field of road construction, including roadways, curbs and bioretention ditch; the roadway includes a surface layer, a stress-absorbing layer, a base layer, and a sub-base layer from top to bottom The surface layer is permeable asphalt concrete, and the asphalt in the asphalt concrete is high-viscosity modified asphalt; the stress-absorbing surface is provided with grooves along the transverse slope of the road to facilitate water collection and drainage; the bottom of the curb is provided with holes, and the drainage pipes are buried to connect to the bioretention ditch, and introduce the rainwater infiltrated from the surface layer into the bioretention ditch; the bioretention ditch includes plants, planting soil, sand filter layer and gravel soil. The pavement structure of the utility model has the remarkable advantages of high high temperature stability, strong low temperature crack resistance, excellent water stability, prolonging the service life of the road, and low later maintenance cost.

Description

A Pavement Structure Suitable for Sponge City

technical field

The utility model relates to the technical field of road construction, in particular to a pavement structure suitable for sponge cities

Background technique

The overall concept of sponge city is to make rainwater have good elasticity so as to better adapt to environmental changes, so it is also called water elastic city. The name of sponge city in the world is unified as "low-impact development rainwater system construction", which can absorb, infiltrate and purify rainwater when it rains, and discharge and use the stored water when needed to save water resources.

At present, the structure of urban roads is mainly composed of subgrade, pavement base layer and surface layer from bottom to top. When rainwater falls on the road, it will form ponding, which will endanger traffic safety and affect the service life of the road. Therefore, the road needs to be able to drain water. At present, the ordinary surface layer is mainly used for direct drainage. The surface layer is impermeable or basically impermeable. , the water is directly discharged from the road surface or directly into the drainage ditches on both sides, which increases the cost of road construction and operation, increases the pressure of urban water discharge, and also does not meet the environmental protection requirements of replenishing groundwater. The precious rainwater resources flow through the hardened The advanced road structure and drainage pipes are taken out of the urban area, which has caused a great waste of water resources, and also does not conform to the concept of sponge city advocated recently.

Utility model content

The purpose of this utility model is to overcome the shortcomings in the above-mentioned prior art and provide a pavement structure suitable for sponge cities. The pavement structure has high high temperature stability, strong low temperature crack resistance, excellent water stability, prolongs the service life of the road, and low maintenance costs in the later period; the large void ratio of the surface layer makes the accumulated water seep quickly, eliminating the traditional compactness in rainy days The water film formed by the pavement structure due to poor drainage reduces the incidence of road safety driving accidents in rainy days; the rainwater that is difficult to handle is introduced into the bioretention ditch to supplement the groundwater through the natural digestion and purification of the soil, which greatly alleviates the urban pollution. "heat island effect".

For realizing above-mentioned object, the technical scheme that the utility model adopts is:

A pavement structure suitable for a sponge city, including a roadway, curbs and bioretention ditch; the roadway includes a surface layer, a stress-absorbing layer, a base layer and a base in sequence from top to bottom; the surface layer adopts Water-permeable asphalt concrete; grooves are provided on the surface of the stress-absorbing layer along the direction of the cross slope of the road to facilitate water collection and drainage. The stress-absorbing layer uses rubber asphalt stabilized gravel, and the base layer adopts cement-stabilized graded gravel layer. The subbase layer adopts a graded crushed stone layer; the bottom of the curb is provided with openings, the buried drainage pipe is connected to the bioretention ditch, and the rainwater infiltrated by the surface layer is introduced into the bioretention ditch; the bioretention ditch From top to bottom, it includes plants, planting soil, sand filter layer and gravel soil.

The asphalt concrete gradation in the utility model is OGFC-13 asphalt concrete, and the porosity of the asphalt concrete is 15%-25%.

The asphalt concrete described in the utility model adopts high-viscosity modified asphalt.

The high-viscosity modified asphalt described in the utility model is TPS modified asphalt.

In the utility model, the thickness of the surface layer is 1cm-2.5cm, the thickness of the stress absorbing layer is 1cm-3cm, the thickness of the base layer is 150mm-200mm, and the thickness of the base layer is 200mm-500mm.

The grooves on the surface of the stress absorbing layer described in the utility model are arranged at an interval of 20-50m and a depth of 0.2-0.4cm.

The drainpipes described in the utility model of cement stabilizing graded crushed stone layer are arranged at an interval of 20-50m.

The radius of the hole at the bottom of the curb in the utility model is 1cm-5cm.

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

1. The surface layer of asphalt concrete is OGFC-13TPS modified asphalt concrete, which can effectively improve the high-temperature stability, low-temperature crack resistance, water stability and low-temperature adhesion of the mixture, greatly enhance the service life of the road surface, and reduce later maintenance cost.

2. The large void ratio of the surface concrete makes the road surface water infiltrate quickly in rainy days, eliminates the water film formed by the traditional dense pavement structure in rainy days due to poor drainage, and reduces the incidence of road safety driving accidents in rainy days.

3. Grooves are set on the surface of the stress-absorbing layer along the direction of the cross slope. The rainwater infiltrating from the surface layer flows into the biological retention ditch through the groove along the cross slope of the road surface and through the drainage pipes set in the middle of the curb. The rainwater is purified by the natural digestion of the soil. Replenishing groundwater can greatly alleviate the "heat island effect" of the city.

In summary, the utility model is a pavement structure suitable for sponge cities, which has high high-temperature stability, low-temperature crack resistance, strong water stability, excellent low-temperature adhesion, long service life, and low maintenance costs in the later period. Eliminate the water film on the road surface in rainy days, enhance road traffic safety, improve the efficiency of rainwater use, and are especially suitable for the promotion and use of sponge city areas.

The technical solutions of the present utility model will be further described in detail through the drawings and embodiments below.

Description of drawings

Fig. 1 is a kind of road surface structure diagram that is applicable to sponge city of the utility model;

Fig. 2 is the structural representation of the stress absorbing layer in the utility model;

Fig. 3 is the structural representation of curb stone in the utility model;

Fig. 4 is the structural representation of the preferred embodiment of the utility model;

Fig. 5 is the structural representation of the utility model comparative example 1;

Fig. 6 is the structural representation of the utility model comparative example 2;

1-roadway; 2-curbstone; 3-biological retention ditch; 4-drainage pipe, 7-rainwater outlet 8-roadbed

9-sidewalk brick 10-rainwater pipeline 101-surface layer; A is OGFC-13 graded TPS modified asphalt concrete B-rubber asphalt stress absorption layer C-cement stabilized graded crushed stone layer D-graded crushed stone base E is AC-13 matrix asphalt concrete F is AC-13 SBS modified asphalt concrete 102-stress absorption layer; 102A-groove 103-base layer; 104-subbase layer; 301-plant; 302-planting soil; 303-sand filter layer; 304 - Gravel soil.

Detailed ways

As shown in Figure 1, a pavement structure suitable for a sponge city includes a roadway 1, a curb 2 and a bioretention ditch 3; the roadway includes a surface layer 101 and a stress-absorbing layer 102 in sequence from top to bottom , the base layer 103 and the subbase layer 104; the surface layer 101 adopts permeable asphalt concrete; the surface of the stress absorbing layer 102 is provided with a groove 102A along the road cross slope direction to facilitate water collection and drainage, and the stress absorbing layer 102 adopts rubber asphalt Stabilized crushed stone, the base layer adopts a cement-stabilized graded crushed stone layer, and the base layer adopts a graded crushed stone layer; the bottom of the curb 2 is provided with an opening 201, and the buried drain pipe 4 is connected to the bioretention The ditch 3, and the rainwater infiltrated by the surface layer 101 is introduced into the bioretention ditch 3; the bioretention ditch 3 includes plants 301, planting soil 302, sand filter layer 303 and gravel soil 304 in sequence from top to bottom.

The asphalt concrete gradation in the utility model is OGFC-13 asphalt concrete, and the porosity of the asphalt concrete is 15%-25%.

The asphalt concrete described in the utility model adopts high-viscosity modified asphalt.

The high-viscosity modified asphalt described in the utility model is TPS modified asphalt.

The thickness of the surface layer 101 of the utility model is 1cm-2.5cm, the thickness of the stress absorbing layer is 1cm-3cm, the thickness of the base layer is 150mm-200mm, and the thickness of the base layer is 200mm-500mm.

The grooves 1021 on the surface of the stress absorbing layer 102 described in the utility model are provided with an interval of 20-50m and a depth of 0.2-0.4cm.

The drainage pipe 4 described in the utility model is provided with an interval of 20-50m.

The radius of the opening 201 at the bottom of the curb 2 described in the utility model is 1cm-5cm.

A kind of high-performance asphalt concrete structure described in the utility model, its construction technological process is as follows:

First: Clean the subgrade area carefully, and meet the design elevation and cross slope under the condition of ensuring compaction;

Second: Pave the subbase and base on the completed roadbed, and ensure the control indicators such as compaction, top surface elevation, and strength;

3rd: After the basic level is checked and accepted, the penetration layer oil is spread, and the stress absorption layer 2 is constructed. After the stress absorption layer 2 is constructed, the surface layer 101 mixture is paved;

Fourth: After the surface layer 101 is checked and accepted, the construction of the curb 2 and the biological retention ditch 3 is carried out.

In order to better illustrate the beneficial effects and significant progress of this utility model structure, the following preferred embodiments and comparative examples thereof are specifically compared, as follows:

Preferred embodiment:

As shown in Figure 4, the surface layer 101 is OGFC-13TPS modified asphalt concrete; the base layer 103 is a cement-stabilized graded crushed stone base, and the base layer 104 is a graded crushed stone; between the surface layer 101 and the base layer 103 is provided with rubber asphalt stress absorbing layer 102.

The radius of the opening at the bottom of the curb 2 is 3 cm; the grooves on the surface of the stress absorbing layer 102 are set at intervals of 25 m and the depth is 0.3 cm; the drainage pipe 4 is arranged in the opening at the bottom of the curb 2 and connected to the bioretention In the planting soil 302 in the ditch 3.

In rainy days, the rainwater infiltrated by the surface layer 101 flows into the bioretention ditch 3 through the grooves along the cross slope of the road and through the drainage pipes 4 arranged at intervals in the curb 2

Comparative example 1:

As shown in Figure 5, the surface course is AC-13 matrix asphalt concrete; the base course is a cement-stabilized graded macadam base, and the subbase is graded macadam; a rubber asphalt stress-absorbing layer is set between the lower course and the base course.

The rainwater enters the rainwater outlet along the cross slope direction of the road on the surface of the surface layer, and finally flows into the rainwater pipeline to connect to the municipal drainage system.

Comparative example 2:

As shown in Figure 6, the surface course is AC-13SBS modified asphalt concrete; the base course is a cement-stabilized graded gravel base, and the subbase is graded gravel; a rubber asphalt stress-absorbing layer is set between the lower layer and the base .

The rainwater enters the rainwater outlet along the cross slope direction of the road on the surface of the surface layer, and finally flows into the rainwater pipeline to connect to the municipal drainage system.

Preferred embodiment and comparative example road performance contrast see table 1 for details:

Table 1 preferred embodiment and comparative example road performance comparison table

It can be seen from the data in Table 1 that the indicators of OGFC-13TPS modified asphalt concrete are better than those of AC-13 matrix asphalt concrete; compared with SBS modified asphalt concrete, due to its larger void ratio, its water stability, The low-temperature crack resistance is slightly inferior to that of AC-13SBS modified asphalt concrete, and its application in the surface course can greatly enhance the water permeability of the pavement.

Compared with the ordinary asphalt pavement structure, the utility model has a larger void ratio of the surface layer concrete, which makes the road area water infiltrate quickly in rainy days, eliminates the water film formed by the traditional dense pavement structure in rainy days due to poor drainage, and reduces the road surface in rainy days. The incidence of safe driving accidents; at the same time, the rainwater infiltrating from the surface layer flows into the biological retention ditch through the groove along the cross slope of the road and through the drainage pipes set in the middle of the curb, and the rainwater replenishes the groundwater through the natural digestion and purification of the soil. To alleviate the city's "heat island effect".

The above are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any simple modifications, changes and equivalent structural transformations made to the above embodiments according to the technical essence of the present utility model still belong to this utility model. Within the scope of protection of utility model technical solutions.

Claims (8)

1. A pavement structure suitable for a sponge city, characterized in that: it comprises a roadway (1), a curb (2) and a bioretention ditch (3); the roadway comprises a surface course from top to bottom (101), stress-absorbing layer (102), base (103) and sub-base (104); the surface course (101) adopts water-permeable asphalt concrete; Grooves are provided to facilitate water collection and drainage, the stress absorbing layer (102) adopts rubber asphalt stabilized gravel, the base layer adopts cement stabilized graded gravel layer, and the subbase layer adopts graded gravel layer; (2) The bottom is provided with an opening (201), and the buried drainage pipe (4) is connected to the bioretention ditch (3), and the rainwater infiltrated by the surface layer (101) is introduced into the bioretention ditch (3); The biological retention ditch (3) includes plants (301), planting soil (302), sand filter layer (303) and gravel soil (304) in order from top to bottom. 2. A pavement structure suitable for sponge cities according to claim 1, characterized in that: the asphalt concrete gradation is OGFC-13 asphalt concrete, and the porosity of the asphalt concrete is 15%-25%. 3. A pavement structure suitable for sponge cities according to claim 1 or 2, characterized in that: the asphalt concrete adopts high-viscosity modified asphalt. 4. A pavement structure suitable for sponge cities according to claim 3, characterized in that: the high-viscosity modified asphalt is TPS modified asphalt. 5. A pavement structure suitable for sponge cities according to claim 1, characterized in that: the thickness of the surface layer (101) is 1cm-2.5cm, and the thickness of the stress-absorbing layer (102) is 1cm-3cm, The thickness of the base layer is 150mm-200mm, and the thickness of the sub-base layer is 200mm-500mm. 6. A pavement structure suitable for a sponge city according to claim 1, characterized in that: the grooves (1021) on the surface of the stress absorbing layer (102) are arranged at an interval of 20-50m and a depth of 0.2-0.4cm. 7. A pavement structure suitable for a sponge city according to claim 1, characterized in that: the drainage pipes (4) are arranged at an interval of 20-50m. 8. A pavement structure suitable for a sponge city according to claim 1, characterized in that: the radius of the opening (201) at the bottom of the curb (2) is 1cm-5cm.