| Customization: | Available |
|---|---|
| After-sales Service: | 24hours Online |
| Warranty: | 12 Months |
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Manhole closings are protected by a manhole cover (also known as a "biscuit"[citation needed]), a flat plug designed to prevent accidental or unauthorized access to the manhole. Those plugs are traditionally made of metal, but may be constructed from precast concrete, glass reinforced plastic or other composite material (especially in Europe, or where cover theft is of concern).
Manholes are usually outfitted with metal, polypropylene, or fiberglass steps installed in the inner side of the wall to allow easy descent into the utility space. Because of legislation restricting acceptable manual handling weights, Europe has seen a move toward lighter weight composite manhole cover materials, which also have the benefits of greater slip resistance and electrical insulating properties.
The access openings are usually circular in shape to prevent accidental fall of the cover into the hole.
Manholes are generally found in urban areas, in streets and occasionally under sidewalks. In rural and undeveloped areas, services such as telephone and electricity are usually carried on utility poles or even pylons rather than underground.
Our company:
Gaotang Dingli Construction Machinery Co., Ltd. is located in beautiful scenery of calligraphy and painting of the township (Gaotang industrial park in Shandong province), the intersection between Qingyin Highway and 308 & 105 National Road, with transport facilities and excellent location.
Our company is one of the largest, the strongest and the most professional cement pipe and equipment manufacturers in Shandong Province. Our company has 20 years of cement products and building materials
Our service:
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