1·Its construction is divided into two parts, one is the lower part of the manhole cover, ensure that the level of it, it needs to be placed in the asphalt material, dealing with rigid cap.
它的施工分为两个部分，一是沙井盖下部部分，保证它的水平性，它需要被安置在沥青材料上，做好刚性盖的处理。
2·Cleaning items: high-rise buildings, building, plant wall repair, cleaning, painting, wall washing, large water tank cleaning, manhole cleaning.
清洗项目：高楼、大厦、厂房的外墙修补、清洗、涂装、外墙清洗、大型污水池清洗、沙井清洗等。