CN205653671U - Bituminous paving permeates water in sponge type city - Google Patents

Abstract

The utility model discloses a sponge-type urban permeable asphalt pavement, which comprises from top to bottom: an upper layer of fine-grained permeable asphalt concrete, a lower layer of large-gap permeable asphalt concrete, a drainage type asphalt macadam layer, and a graded macadam layer , Anti-seepage and reverse filter layer and roadbed. The utility model adopts a multi-layer permeable pavement by optimizing the pavement structure design, and the upper layer has a small void ratio, which prevents solid particles from entering the permeable structure layer, and at the same time can ensure the smooth penetration of rainwater on the permeable pavement, and reduce the aging of the surface layer , prolong the service life of the pavement, slow down the aging of the permeable asphalt pavement, has the characteristics of good penetration effect, low laying cost and simple laying process, and can meet the road performance requirements of the sponge city type permeable asphalt pavement.

Description

A sponge-type urban permeable asphalt pavement

technical field

The utility model relates to the field of pavement materials, in particular to a sponge-type urban permeable asphalt pavement.

Background technique

In the construction of sponge city, permeable asphalt pavement is an important part. Urban roads, community roads, parks, squares and other pavements with water permeable function will significantly increase the urban sponge body. When it rains, the rainwater will seep underground, and the road surface will absorb water like a sponge, thereby eliminating ground water, reducing wheel slippage, and reducing The water mist effect makes driving safer, delays the time of flood peaks, reduces ground flood disasters, and also plays a role in reducing noise, adjusting the temperature and humidity of the environment, and reducing the heat island effect.

During the actual use of the permeable asphalt pavement in a sponge-type city, due to the large void ratio of the road surface, the contact area between the asphalt and the air is large, and the durability is poor. Below the road surface, the pores are blocked and difficult to clean, which reduces the water permeability coefficient of the road surface and affects the construction effect of the sponge city. In addition, when the permeable roadbed is in a wet state for a long time, the base layer is easy to soften and swell. Under the continuous action of vehicle load, the soil mud of the roadbed is easy to return to the permeable structure, so that the foundation is unstable and the road surface is pumped, which affects the actual use of the road surface.

Utility model content

The technical problem mainly solved by the utility model is that the permeable asphalt pavement of the existing sponge-type city has poor durability and is easy to be blocked and difficult to clean. , to prevent the clogging of the gaps on the road surface, maintain the permeable effect of the road surface, and realize the smooth penetration of rainwater.

In order to solve the above-mentioned technical problems, a technical solution adopted by the utility model is: provide a kind of sponge-type urban permeable asphalt pavement, which respectively includes from top to bottom: the upper layer of fine-grained permeable asphalt concrete, the lower layer of large-gap permeable asphalt concrete, Drainage asphalt macadam layer, graded macadam layer, anti-seepage filter layer and roadbed.

Preferably, the thickness of the upper layer of the fine-grained permeable asphalt concrete is 2.5-3 cm, and the porosity is 10-15%; the thickness of the lower layer of the large-pore permeable asphalt concrete is 5-8 cm, and the porosity is 18-25 %.

Preferably, the thickness of the drainage asphalt macadam layer is 8-15 cm, and the porosity is 18-25%.

Preferably, the graded gravel layer has a thickness of 10-30 cm and a void ratio of 18-25%.

Preferably, the anti-seepage and reverse filter layer is 2-4 layers of crushed stones or pebbles with gradually decreasing particle size, with a thickness of 10-20 cm, laid on the filter geotextile from bottom to top.

Preferably, the roadbed is sandy soil, clay, loess, gravel soil and the like.

The beneficial effects of the utility model are: different from the situation of the prior art, the utility model adopts a multi-layer permeable pavement by optimizing the pavement structure design, and the upper layer has a small void ratio, which prevents solid particles from entering the permeable structure layer, and at the same time can ensure The permeable pavement realizes the smooth penetration of rainwater, maintains the permeable effect of the pavement, reduces the aging of the surface layer, prolongs the service life of the pavement, and slows down the aging of the permeable asphalt pavement. In addition, the utility model avoids the instability of the roadbed by setting multi-layer anti-seepage and reverse filter layers on the roadbed, stabilizes the structure of the permeable road surface, and makes it truly play the role of an urban sponge, with good penetration effect and low laying cost And the characteristics of simple laying process can meet the road performance requirements of sponge city type permeable asphalt pavement.

Description of drawings

Fig. 1 is the structural representation of the utility model sponge-type city permeable asphalt pavement.

detailed description

Please refer to Fig. 1, the utility model provides a kind of spongy urban permeable asphalt pavement, which respectively includes from top to bottom: fine-grained permeable asphalt concrete upper layer 1, large-gap permeable asphalt concrete lower layer 2, drainage type asphalt macadam layer 3 , Graded gravel layer 4, anti-seepage and reverse filter layer 5 and subgrade 6.

Among them, the thickness of the upper layer 1 of the fine-grained permeable asphalt concrete is 2.5-3cm, and the porosity is 10-15%; the permeable asphalt can be made of SBS modified asphalt, high-viscosity asphalt, SBR modified Asphalt, colored asphalt, etc., the aggregate used can be basalt, granite, diabase, limestone, etc.

The thickness of the lower layer 2 of the large-void permeable asphalt concrete is 5-8 cm, and the porosity is 18-25%. The permeable asphalt can be SBS modified asphalt, high viscosity asphalt, SBR modified asphalt, rubber asphalt, etc., and the aggregate used can be basalt, granite, diabase, limestone, etc.

The drainage type asphalt macadam layer 3 has a thickness of 8-15 cm and a void ratio of 18-25%. Among them, the modulus of sand grain fineness is 3.1-3.7.

The thickness of the graded crushed stone layer 4 is 10-30 cm, the porosity is 18-25%, the crushing value of the stone materials used is not more than 30%, and the water absorption rate is not more than 3.0%.

The anti-seepage and reverse filter layer 5 is laid on the filter geotextile from bottom to top with 2-4 layers of crushed stones or pebbles whose particle size gradually decreases, with a thickness of 10-20cm and a sand fineness modulus of 1.6-3.7. Stones and pebbles are rock particles with a particle size greater than 4.75mm. The anti-seepage and reverse filter layer 5 does not move between aggregates in the same layer, and particles in any layer are not allowed to pass through the pores of the adjacent layer.

The subgrade 6 is sandy soil, clay, loess, gravel soil, etc., and should meet the bearing capacity after soaking in water.

The construction process of the utility model sponge type urban permeable asphalt pavement is as follows:

1). Construction preparation: lay out the wires according to the design requirements, clean up the work site, and prepare materials and tools.

2). Subgrade treatment: tamp or compact the original soil layer of the road bed with a tamping machine or a road roller to form the original soil road base. Reach a compaction degree of more than 93%.

3). Lay the anti-filter geotextile on the subgrade 6. The laying direction of the geotextile must be correct. According to the materials used for the anti-filter geotextile, welding or lap joints can be used for splicing.

4). When the anti-seepage and reverse filter layer 5 is laid, 2-4 layers of sand, gravel, and pebbles are laid from bottom to top. A layer of particles is not allowed to pass through the pores of the adjacent layer. The porosity of gravel sand and coarse-grained filter layer shall not be less than 35%. Coarse gravel and pebbles should be hard and durable.

5). A graded crushed stone layer 4 with a thickness of 10-30 cm is laid on the anti-seepage and reverse filter layer 5. The crushed stone should not contain impurities such as clay blocks and plants, and the porosity is 18-25%. The crushing value of the stone used is not more than 30%, and the water absorption rate is not more than 3.0%.

6). Sprinkle sticky layer oil on the graded gravel layer 4, and then lay an 8-15cm drainage asphalt gravel layer 3 with a void ratio of 18-25%. Coarse-grained or extra-coarse type can be used. The maximum particle size is 26.5-37.5mm, and the factory-mixed asphalt gravel can be paved with a paver, and rolled and leveled with an 8-12t road roller.

7). After spreading sticky layer oil on the drainage asphalt macadam layer 3, lay the lower layer 2 of permeable asphalt concrete with large voids, the thickness is 5-8cm, and the void ratio is 18-25%. The paving and compaction should be To meet the design requirements, special personnel are assigned to brush the rollers of the roller with machine oil during the paving process to prevent the rollers from sticking to the pellets.

8). Finally, spread sticky layer oil on the lower layer 2 of permeable asphalt with large voids, and then lay fine-grained permeable asphalt concrete surface layer 1 with a thickness of 2.5-3cm and a void ratio of 10-15%. Design requirements. The permeable asphalt can be SBS modified asphalt, high viscosity asphalt, SBR modified asphalt, rubber asphalt, bright color asphalt, colored asphalt, etc., and the aggregate used can be basalt, granite, diabase, limestone, etc.

The utility model adopts a multi-layer permeable pavement by optimizing the pavement structure design, and the upper layer has a small void ratio, which prevents solid particles from entering the permeable structure layer, and at the same time can ensure that the permeable pavement realizes smooth penetration of rainwater, maintains the permeable effect of the pavement, and reduces The aging of the small surface layer prolongs the service life of the pavement and slows down the aging of the permeable asphalt pavement. In addition, the utility model avoids the instability of the roadbed by setting multi-layer anti-seepage and reverse filter layers on the roadbed, stabilizes the structure of the permeable road surface, and makes it truly play the role of an urban sponge, with good penetration effect and low laying cost And the characteristics of simple laying process can meet the road performance requirements of sponge city type permeable asphalt pavement.

The above descriptions are only examples of the present utility model, and are not intended to limit the patent scope of the present utility model. Any equivalent structure or equivalent process conversion made by using the utility model specification and the drawings of the specification, or directly or indirectly used in other Related technical fields are all included in the patent protection scope of the present utility model in the same way.

Claims (5)

1. A sponge-type urban permeable asphalt pavement is characterized in that, from top to bottom, it comprises: a fine-grained permeable asphalt concrete upper layer, a large void permeable asphalt concrete lower layer, a drainage type asphalt gravel layer, and a graded gravel layer, anti-seepage and reverse filter layer and roadbed. 2. The spongy urban permeable asphalt pavement according to claim 1, characterized in that, the thickness of the upper layer of fine-grained permeable asphalt concrete is 2.5-3cm, and the porosity is 10-15%; The thickness of the lower layer of asphalt concrete is 5-8cm, and the void ratio is 18-25%. 3. The spongy urban permeable asphalt pavement according to claim 2, characterized in that the drainage type asphalt macadam layer has a thickness of 8-15cm and a void ratio of 18-25%. 4. The sponge-type urban water-permeable asphalt pavement according to claim 1, characterized in that, the thickness of the graded gravel layer is 10-30 cm, and the porosity is 18-25%. 5. The sponge-type urban permeable asphalt pavement according to claim 1, characterized in that, the anti-seepage and reverse filter layer is a reverse filter geotextile that lays 2-4 layers of crushed stones whose particle size increases step by step from bottom to top. Or pebbles with a thickness of 10-20cm.