All the tubes used are 16x20 mm. In special cases, where the insertion of all the tubes is difficult due to dimensions, 11.5x14 mm o 13x16 mm tubes are used for vent only. Tubes come in 5 colours to identify their applications; for their identification a base operating instruction and the relating specifications for special applications are given.
Metallic or polyethylene sheaths represent the most economical means to create voids in post-tensioned elements. They provide a good secondary protection against corrosion and a good connection between cables and concrete. The primary protection against corrosion is provided by the grouting alkalinity and by concrete itself, the secondary one by the sheath and its protective barrier to the cable.
The cap is made up of a cover equipped with a sealing gasket fixed to the casting by means of suitable anchorages which vary in length and size depending on the several applications. A special closing disc tightens the sealing gasket and the cap to the grouting. The disc allows to turn the cap into the most suitable position to allow all the air to come out of the vent tube.
The grouting and vent of grouted cables is carried out by means of several systems designed to make activities on site as easy as possible. We offer front grouting by rigid PVC tube and flexible solutions by corrugated polyethylene tubes. There are no particular specifications to determine the choice of one system, which is defined based on the installation.
Pocket formers are produced for single strand applications in order to create, by means of special reusable plastic moulds, recesses that allow sealing after anchorage tensioning. All pocket formers are mounted only on active anchorages applications.
Protection caps for TTM and TTM-F anchorages are designed to allow the complete grouting of grease of the anchorage. Their small dimensions allow a localized filling with small quantities of grease to protect the locking. DD-KP cap to protected TTM and TTM-F anchorages on distribution plates: oxy-fuel cut, painted and provided with fixing holes.