人妻 制服 出轨 中字在线

helpline:+8618653298567

Service time

24 Hours Service

Write to us

sg@sgstone.net

E-mailsg@sgstone.net

Contact Us+8618653298567

Asphalt surface structure

May 29, 2019

The internal surface of the asphalt surface structure leaks underwater to the top surface of the base layer, and the interface water between the same surface layer and the base layer (the main source of interface water: internal water of the asphalt surface structure, the ground water entering the interface from the edge of the road or the gap between the pavements, Groundwater, etc.), together, it flows to the roadside under the effect of gravity, flows through the porous concrete of the curbstone to the culvert, and then flows from the culvert to the rainwater well to realize the drainage of the water inside the pavement layer.


Related News

Recommended

人妻 制服 出轨 中字在线