- The roadform shuttering technique, according to Pavingexpert.com, is the favorite of many contractors because of its ability to stand up under the daily activities that take place on a busy construction job. Formwork material is not easily breakable and is capable of repeated use. This method involves the building of a channel-shaped steel section about 3 meters in length, and 100, 150 or 200 meters in depth. Three fastening brackets are used on the back edge. A sliding tongue fitting enables the builder to hook nearby sections together.
Stacking these sections accommodates a greater depth of concrete, although Pavingexpert.com suggests a limit of two units high, because of the impracticality of using steel pins to brace anything much higher. Contractors align the sections with a tight string or laser level they employ as a plumb line. They raise the instrument to the required profile, making sure that the faces of the sections are plumb, or level vertically. - Timber shuttering is flexible, allowing the contractor to use it for a variety of shapes and depths. According to the Pavingexpert.com, it is the usual choice of concrete workers.
The portion of the formwork that contacts the concrete is the form lining. The collective timbers are the bracing, which consists of the horizontal walers and vertical noggins. The timber sizes the contractor uses for the bracings depends on formwork size. The form lining is usually a type of plywood. Fifteen or 18-millimeter exterior plywood planks are common. Weather and Boil Proof is the preferred type of plywood. WBP plywood is made with water-resistant adhesives that hold up to dampness. - Groundform is a permanent framework technique. Cordek.com reports that builders use it in the construction of both residential and commercial structures. It eliminates the necessity for concrete blinding. In concrete binding, an application of a thin concrete layer or other suitable material is used to plug up surface voids and to provide a dry, clean surface on which to work. Groundform also reduces digging requirements.
- Cellform is a Cordek-patented shuttering technique contractors employ for the construction of ground beams and pile caps in areas where ground movement is likely. The Cordek company tailors the formwork according to site specifications based on blueprints. The manufacturers use polystyrene and strong polyprophylene, because the structure of these chemicals protects the resultant shuttering from upward movement.
- Climbing formwork is a shuttering technique builders use for tall buildings. This system entails the hookup of a bracelet onto anchors in an already cast wall, as the Masterbuilder.com points out. The builder braces these brackets to avoid sway, providing walkways and working platforms for the safety and ease of the workers. Climbing formwork is of three types -- simple climbing, traveling climbing and automatic climbing. In the simple climbing formwork system, a crane or other lifting device handles the brackets and the wall formwork separately. The traveling climbing formwork system treats the lifting of the wall formwork and the climbing bracket as a single unit. It allows the rollback of shutters, taking them down and cleaning them. According to Masterbuilder.com, this method is more time-efficient in that it eliminates much of the crane time. The automatic system adds another dynamic to the equation -- hydraulics. This eliminates the need for the crane to handle the wall and brackets. It's only necessary to use a crane at the beginning and the end of a project.
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