Project for Building S.p.a.
24050 Mornico al Serio (BG)
Tel. 035 44 90 440
Fax 035 44 90 752
GRANCHIO is a disposable formwork in recycled polypropylene which is used, as an alternative to traditional systems, for the construction of ventilated crawl spaces in both new constructions and renovation projects.
In accordance with the recommendation of the Commission of the European Communities of 02/21/90, due to the positioning of special ventilation holes, crawl spaces made with the GRANCHIO formwork benefit from good ventilation; moreover, humidity is eliminated, and radon gas is dispersed.
We recommend an alternation of holes every 4/5 m. with a diameter of 8/12 cm.
GRANCHIO, being a disposable formwork, is designed to support the weight of the operators and the concrete during casting.
The useful load varies depending on the capacity of the ground, the underlying lean concrete and the thickness of the slab.
GRANCHIO is equipped with an interlocking connection system which makes it fast and easy to lay. Also, its hollow structure allows pipes, ducts and cables to be positioned in every direction
Perimetral accessory, as an alternative to the traditional wooden formwork which, with its lightweight quality and ease of use, makes it possible to create both the foundation beams and the crawl space, thereby minimizing the time taken for installation.
NB: the profile must be fixed to the base
|Dimensions in CM
EXCERPT OF LOAD TESTS
performed at the Istituto Giordano in Bellaria (RN)
TEST CERTIFICATE N. 185603/137881/04
The Granchio sample in H40 composed of nine elements was subjected to a load test by means of the hydraulic jack acting on the slab with a thickness of 5cm. rein¬forced with electro-welded Ø5 mesh mea¬suring 20×20.
The load was applied through a metal load spreader measuring 32x32x4 cm
The tests were carried out to a maximum load of about 195.5 kN (maximum load at break) with final failure of the order of 7.64 mm at a load of 166.7 kN.
WORKING DIMENSIONS AND CHARACTERISTICS OF EACH ELEMENT
TABLE OF USEFUL LOAD ON THE SLAB IN Kg./m2
USAGE IN ATTICS
USAGE IN VENTILATED CRAWL SPACES
a1) RcK 150 concrete must be used for lean concrete casting with a thickness of cm. … for forming the laying level of the formwork called «GRANCHIO».
a2) To loads of more than Kg. / m2 4000 and / or for construction in seismic areas the foundations must be made from RcK 150 with welded mesh Ø 6 10×10.
- b) Supply and dry laying on the floor made from rectangular plastic formwork type GRANCHIO» H. cm. …. The installation will be carried out following the arrow indicators.
- c) Supply and installation of plastic angular profile as required, with development cm. ………… Measures to prevent the overflow of concrete during casting.
- d) Supply and installation of reinforcement consisting of welded mesh Ø6 20×20.
- e) Supply and installation of concrete RcK 250 to fill the «GRANCHIO» and formation of slab with thickness of cm. …. .
NB: When a floor is made with finished casting, the concrete should be cast in two phases: the first for filling of the legs and the second for making the flooring slab.
After this, the “EXPANSION JOINTS” should be made, with a centre to centre distance of about mt. 4×4
The “granchio” may exhibit marked variations in colour due to the use of recycled plastics.