Tunnel Forms Formwork is used in building structures which are both from walls and slabs. They are designed somehow in which half of each slab with its adjoining wall and two integrated formworks become mantled as an L-shape all at the same time. After reinforcement, concrete is poured. The location of mechanical and electrical installations can be anticipated in this system and the formworks get opened and closed uninterraptedly. Mantling by a crane is done in a minimum time.
Tunnel formworks are used for lining channels, shafts and deviational tunnels. Tulle-shaped forms, in terms of assembling and disassembling, are categorized in two parts:
- Hydraulic forms
- Mechanical forms
In hydraulic forms, assembling and disassembling segments of form is carried out through using hydraulic jacks while in mechanical forms, it is carried out through suing manual or hydraulic jacks. Usually, in large segments, hydraulic system is used and this is due to heaviness of segments. Using hydraulic in small forms is a very hard task technically while in inner parts form of tunnel will create limitation.