The fiberglass sub cover, also known as the fiberglass inner cover, is placed inside the ductile iron well cover, composite well cover, and steel fiber well cover to prevent personnel from falling if the outer well cover is damaged or lost.
Depending on the situation, there are several functions: 1. Preventing personnel from falling into the main shaft cover and causing injury after it is damaged, 2. Requiring waterproof inspection wells, and 3. Filling insulation materials between the sub cover and the main cover to provide thermal insulation.
The fiberglass sub cover mainly consists of unsaturated resin and glass fiber as reinforcing materials, which are pressed and molded at high temperature in one step. The fiberglass inner cover is a composite material that has no recycling value and has anti-theft properties; Glass fiber reinforced plastic material has the advantages of light weight, convenient transportation and installation, corrosion resistance, non rusting, and long service life.
The fiberglass inner cover is mainly divided into two types according to the different conditions of use: sealing and hollow type. It can also be customized according to customer requirements.