Sistem de ventilatie pentru celule frigorifice negative GEOPLAST MODULO ® FREEZE

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Tip documentatie: Catalog, brosura

Pagina 1 - Sistem de ventilatie pentru celule frigorifice negative GEOPLAST MODULO ® FREEZE...

Ventilation system for negative refrigeration cells www.geoplast.it MODULO FREEZE FREEZER ROOMS Warehouses and refrigeration cells for conserving food are increasingly common construction types in the industrial food sector. Due to the considerable variety of foods to be stored, there are two types: • NEGATIVE CELLS at low temperatures (-4°C -30°C); • POSITIVE CELLS at medium temperatures (0°C +4°C). FROST HEAVING/FROST HEAVE The problem detectable in the refrigeration cells is the eventuality that the freezing cold is transmitted through the structure, downwards to the ground and taking the temperature below 0°C. In these situations a process known as frost heaving or frost heave occurs, by which the freezing of the soil, saturated with water, causes a deformation, pushing its surfaces upwards. When the water contained in the soil freezes, its volume increases and expands to push equally in every direction. The upwards vertical component of this push risks raising the fo

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undation package, thus deforming the ﬂooring and, consequently, limiting the use of the warehouse or leading to the formation of cracks on the ﬂooring rendering the structure unsafe and unusable. The damages caused by a frozen ﬂoor can lead to structural problems in that, upon verifying this situation, may result in the complete demolition of the damaged foundation structure and its restoration. Essentially, at the moment defrosting occurs, the ﬂooring does not return to its original position and the subsequent slow rising ruins the shelving and any automatic pick-up systems beyond repair. w -30°C -10°C 0°C 10°C 20°C 30°C ﬁg. 1) Inside of a freezer room. ﬁg. 2) Isothermal chart of the ground below a freezer room. ﬁg. 3) Damage caused by frost heave. WHY USE MODULO SYSTEM The refrigeration warehouses can be protected by means of various systems. Producing a ventilated cavity between the ground and the last impermeable layer of the cell package is the safest and mo

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st economic construction method, able to completely eliminate humidity. It involves a passive system that does not call for complex labour and maintenance interventions. This ventilated cavity can be achieved with the MODULO SYSTEM® formwork, which consists of PP (regenerated polypropylene) forms, light and easy to assemble. To guarantee excellent ventilation, connect the crawl space with the outside trhough the previously created holes in the containment walls. In case the crawl space is divided by intermediate ground beams, all sectors must be interconnected to ensure a correct and continuous airﬂow. MODULO SYSTEM® is fully treadable, therefore the laying of the welded mesh is fast and safe. Thanks to the conformation of Modulo, with its domes and support feet, it is possible to guarantee a high capacity for operating loads whether distributed or concentrated. ﬁg. 4) Installation of the MODULO FREEZE ﬁg. 5) Appropriate external ventilation - Holes approx. every 1 m. ﬁg.

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6) Service insertion. ﬁg. 7) Even ventilation distribution. 2 GEOBLOCK® WHY USE GEOBLOCK® GEOBLOCK® is an innovative product which solves very easily some typical jobsite problems. The product ensures the perfect closing of MODULO SYSTEM, forming ground beams extremely quickly and avoiding any trimming of the plastic parts to adjust the forms to plan. GEOBLOCK®, made in PP (Regenerated Polypropylene*), is ﬂexible and adaptable to every constructive type. It is available in lengths from 25 to 39 cm, and is combined with MODULO SYSTEM® of a height of 13 to 70 cm. *PP: Flexural modulus 1100 N/mm2 - Tensile strength 35 N/mm2 - Coefﬁcient of thermal expansion 0.15 mm/m/°C. ﬁg. 9) Example of ﬁll-in around a column. ﬁg. 8) Typical application with GEOBLOCK® ﬁg. 10) Modular forming. ADVISED SITES Thanks to the experience in the ﬁeld of freezer cells and to the collaboration with specialist studies in their sizes, Geoplast S.p.A. proposes a range of ideal products

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. For the excellent production of the ventilated foundation it is recommended to use MODULO SYSTEM® with heights including between 20 and 40 cm. With heights of less than 20 cm the ventilation of the crawl space would be reduced and not effective; while with heights of over 40 cm possible problems of instability could be conﬁgured deriving from the raised loads characterised by the refrigerated cell, often dynamic type loads such as wheels for the transport of containers. To increase the solidity of the structure it is advised to introduce stiffening beams approx. every 20 m, through the use of the GEOBLOCK® elements. These beams must however guarantee the ﬂow of air in the crawl space through the connection holes. INDUSTRIAL FLOORING VAPOUR BARRIER MULTI-LAYER INSULATION COMPLEMENTARY REINFORCED SLAB NATURAL SOIL LEAN CONCRETE LOWER REINFORCED SLAB ﬁg. 11) Modulo System H20 ﬁg. 12) Modulo System H40 MODULO SYSTEM + GEOBLOCK ﬁg. 13) Build-up of a Modulo Freeze system.

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3 INSTALLATION METHOD 3 3 4 1 2 1 5 7 6 8 5 1. Pouring the perimeter foundation beams by providing the holes for ventilating the crawl space according to the directions of the plans supplied by Geoplast (pitch and diameter). 5. 6. Through the use of GEOBLOCK® or FERMAGETTO elements, produce some stiffening beams, making sure that tubes to provide ventilation between different sectors of the crawl space. Lay the welded mesh directly above the MODULO SYSTEM®: the geometric conformation of MODULO SYSTEM® and GEOBLOCK® makes the concrete cover sufﬁcient to embed the steel completely in the pour. operation following the instructions provided by Geoplast, taking care to adequately vibrate the concrete. 2. Produce a slab in reinforced concrete with a thickness suited to the anticipated loads. 3. Realize the side closing structure and the cover. 4. Install the MODULO SYSTEM® forms by following all of the directions supplied by the Geoplast technical plans without, in any cas

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e, performing cuts and trimmings unless authorised. 7. Perform the pour of the foundation beams and the slab in a single 8. Then install the subsequent ﬁnishing layers of the refrigerated cell (insulation + ﬂooring), placing control joints in the concrete. MODULO SYSTEM SPECIFICATION Formation of an aerated crawl space inclusive of an upper slab in r.c. by positioning on a preformed plain of mutually connected modular elements in regenerated polypropylene type MODULO SYSTEM® by Geoplast S.p.A., with a squared base and variable height according to the project, with a dome shape, or series of lowered domes, equipped with at least 4 planes of reference for the laying and correct positioning of the welded mesh in order to avoid any depressions close to the support feet of the framework. The modules, mutually connected, will be ﬁt for receiving the pour of concrete with a minimum resistance class C20/25, and will form a series of pillars in a two-way square matrix. The resulting cr

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awl space will be used a squared matrix wheel base in two directions. The resulting plumbing void will be used for the passage of systems in general and/or the ventilation of the foundation. The side closings will be produced with GEOBLOCK® extendable type elements ﬁt for compensating all measurements of project to produce a single laying of a slab foundation and stiffening beams. The price includes: • Supply and installation of thickness as speciﬁed by the project. • At the discretion of the Josite Manager, holes and/or trenches can be formed for the ducting and/or tubing passage before the installation of the forming system. • The ﬂooring will be ventilated by forming holes with a minimum diameter of 80 mm on the perimeter walls at a distance of about one every metre, complete with possible PVC connection tubing and the external grills in stainless steel equipped with an anti-insect mesh in plastic material. The aeration holes, for sufﬁcient ventilation, will preferabl