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Promat Tunnel
Bormstraat 24 - 2830 Tisselt
Tel. : +32 (0)15 71 81 00
Fax : +32 (0)15 71 81 09 |
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Tunnel forum / FAQ
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| How do we ensure the screws or bolts remain in situ ? |
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| If the PROMATECT® H is used as permanent shuttering the screws are embedded within the concrete, thus they cannot fall out, if the bolts used for fixing using the post installation method described in section 8.2, are not tight, the board will fall as the support is removed.. Tests have been carried out to show that even without the screws, a section of board used as shuttering has a very high adhesion to the concrete and will not fall away, tests on fully soaked boards have been carried out to simulate the effects on suction and to ascertain whether the bolt heads and washers would pull through the board. These tests were carried out on 15mm, 20mm, 25mm, and 30mm and showed that very high loads are required to pull the fixings through the boards. The average pull through strength measured for a 25mm board, fully immersed in water for 72 hours prior to the test, was a pull through load of 1884N for a 6mm diameter expansion bolt, and 1271N for a 5mm diameter screw. |
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