THE IMPORTANCE OF Tunnels
A tunnel is an underground passageway, dug through the surrounding soil/earth/rock and enclosed except for entrance and exit, commonly at each end. A pipeline is not a tunnel, though some recent tunnels have used immersed tube construction techniques rather than traditional tunnel boring methods.
A tunnel may be for foot or vehicular road traffic, for rail traffic, or for a canal. The central portions of a rapid transit network are usually in the tunnel. Some tunnels are used as sewers or aqueducts to supply water for consumption or for hydroelectric stations. Utility tunnels are used for routing steam, chilled water, electrical power or telecommunication cables, as well as connecting buildings for convenient passage of people and equipment.
ADVANTAGES OF ADDING Polypropylene fiber
A tunnel excavated in brittle rock receives a concrete support layer on its surface to reduce the displacement of the rock layer or gravel. The structural support of this concrete is very important to protect the safety of workers during the use and construction of the tunnel.
The HPP fibers were not effective in compressive strength when compared to steel fibers, but the effects of HPP fibers on tensile strength, flexural strength, toughness and energy absorption of concrete were significant. Based on the results, the effects of HPP fibers on concrete characteristics such as the flexural toughness, concrete permeability and resistance to chloride penetration were higher than those of steel fibers. The results also showed that with application of HPP fibers, durability and serviceability of the concrete linings can be improved.
Why Chose Michem
Michem offer a wide range of products including fibres reinforcement Concrete, Concrete Reinforcement Fibres, Reinforcement Fibres, Fibre Reinforced Shotcrete, Polypropylene Synthetic Fibres, and many more products. With our consistent services and quality products, we have attained a great position in the Fibre Division Segment. We ensure that you get the best products for your successful project completion