When it rains, you need to be careful when walking on the sidewalk. If you accidentally step on a loose brick, water will splash on your feet instantly. Many people have comprehended this sour experience.
But this situation will no longer exist on No. 2 Avenue in Rensha. In November last year, the Urban Development Center of the Development Zone upgraded and renovated Road No. 2 (No. 23 Avenue-Yanjiang Avenue). The important part was laying permeable bricks on the sidewalk. Permeable paving has a great effect on urban roads, which can most intuitively reflect the concept of sponge city construction. Pervious paving can improve the surface ecology of vegetation, reduce the pressure on urban drainage pipes, reduce pollution in public waters, and compensate for groundwater sources.
Yesterday, the sidewalk from No. 2 Avenue from east to west was covered with a thin film, which seemed to be a "mask" for the sidewalk. Chen Gong, who works on the site, introduced: "These films are called permeable geotextiles, which are used to maintain the overall structure and function of the material. The permeable concrete layer below is part of creating a permeable sidewalk."
At present, the sidewalk permeable step bricks have been initially laid at the entrance of Baolong City Square. "These bricks are ceramic permeable bricks. Don't look at their posture similar to ordinary bricks, but the water absorption effect is very good. And this kind of bricks are still It has the characteristics of good compressive and flexural strength, safety and comfort, low carbon and environmental protection, and strong noise reduction capabilities. "
In order to verify the water absorption, Chen Gong found a bucket of latex paint, and poured a bucket full of water and poured it directly. The water immediately penetrated from the outside. The floor tiles felt a little tactile with a touch of the hand, because it happened to be noon and the temperature was relatively high. After another 3 minutes, the tiles are completely dry.
But it's not just the permeable bricks who can soak up water so quickly. This is also the result of the synergy of several "little partners".
According to reports, this "sponge" sidewalk is permeable bricks and medium sand screeds from top to bottom (reporter's note, a layer of tiled sand is used to ensure the flatness of the ground), permeable geotextiles, and permeable mixes with open spaces Dirt, gravel pads and original roadbed. When the rain is favorable, the standing water will seep out of the open space. When the gap between the pavement is permeable, the structural space constitutes a "negative pressure", and then the water permeability rate is increased. "When encountering heavy rain, such sidewalks can quickly absorb water, reduce road water to the greatest extent, and then reduce the drainage pressure of the rainwater pipe network and gutters." Chen Gong said.
In walking experience, because the permeable brick surface uses finer particles, the walking feeling will be softer, less prone to fatigue, and less likely to slip. In addition, the flatness of the top is relatively high. Even if the baby stroller is pushed up, it will be almost peaceful and not too shocking. In addition, these permeable bricks are fastened under the buckle, which is relatively robust, and will not show the situation of splashing water with one foot stepping over time.
It is worth mentioning that this is also the first “sponge” permeable sidewalk built with the sponge city concept in Xiasha. After completion, it will not only compensate for groundwater sources, but more importantly reduce peak flow and purify rainwater.
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