Technical Field

The technical solution relates to a plastic cellar, manufactured as a large plastic container placed below the ground surface, wherein a wide neck alongside a large entrance is disposed on the ceiling, so that one can enter the cellar using a ladder or stairs. The shape of the container may be in the shape of a cube, cylinder or sphere, or may have another geometrical shape as well.

Background Art

Plastic cellars are then a very interesting and practical alternative to common cellars. They are cheaper, as well as immune to corrosion, mold and moisture. Their mounting does not require a number of actions, such as waterproofing, and they can also be operated in low-lying areas where groundwater under pressure is a threat. Plastic cellars are 100% protected against the effects of water leakage. The manufacturers and retailers of plastic cellars all emphasize their versatility in the first place. They can be built and used at any location, at any groundwater level as well as independently of soil type. The advantage is the minimization of construction work, as the cellar itself is already constructed and most of the work required to build conventional cellars is unnecessary.

The storage conditions in plastic cellars are ideal due to the ventilation duct. Thanks to the high quality air circulation, no condensation of the air or mold and internal moisture are produced. All of this contributes and is virtually the key to a long-term storage of food under appropriate conditions. We can also highlight the long life of the plastic cellar, currently reported at more than half a century. At the same time, the plastic cellar meets a high protective function against rodents, larvae, insects and other biological risks. The plastic cellar acts as a refrigerator that is buried underground. The essence of the plastic cellar is a large plastic container, located below the ground. It has a wide neck, which has a wide entrance.

CN 207235975U U (ZHOU YANTAO) discloses a plastic vegetable cellar formed as a single-unit waterproof plastic product provided with a wide neck with stairs in the shape of an ellipse or circle.

DE 202015006984U U1 (REINHARDT GMBH) discloses a cellar comprised of concrete segments.

FR 2634811 A1 (BRO EUROPA) discloses a prefabricated storage tank (cellar) constructed, for example, of glass fiber reinforced polyester. The cellar is of cylindrical shape with a plastic lid with the possibility of an entrance to the cellar using a ladder. The objective of this technical solution is to provide a plastic container having a spherical shape. Plastic spherical containers are currently manufactured as single units, thus consisting of one piece or two connected hemispheres and produced by casting, which is rather difficult to manufacture at smaller plants and their production is quite expensive, which is also being reflected in the sales price on the market.

Essence of the Technical Solution

A plastic cellar comprising a plastic container in the shape of a sphere, with a wide neck provided with an opening with a hatch and steps disposed in the upper part, wherein the shell of the plastic container in the shape of a sphere is comprised of segments, i.e. of parts connected by welding, wherein the welds are solid and waterproof.

The plastic cellar has a segment manufactured as a part of the spherical surface of a symmetrical shape along a longitudinal axis, where the segment at first has a geometric shape and then ends adjusted to being mounted, wherein the optimal number of segments is 21.

A plastic cellar in which polypropylene is used for the production of the segments and its properties such as endurance, toughness, flexibility and good weldability are employed.

A plastic cellar in which an extruder is used for the welding of the segments wherein a solid and a waterproof weld is manufactured using a polypropylene wire.

A plastic cellar with an entrance opening and a hatch having a cross-section resulting from the cross-section of the neck, such as square, rectangular and preferably oval.

Brief Explanation of the Drawings

Fig. 1 is a view of a plastic cellar.

Fig. 2 is a view of the neck of the plastic cellar terminated by an oval opening.

Fig. 3a shows a segment in the geometric shape.

Fig. 3b shows a ready-to-mount segment with adjusted ends.

Modes for Carrying out the Technical Solution

Fig. 1 shows a plastic cellar 1 comprising a spherical plastic container 2, whose shell is made of segments CT having the geometric shape CT further comprising a wide neck 3 connected to the spherical container 2 terminated by a hatch opening 4, wherein the hatch opening 4 has a square, rectangular and preferably oval cross section. On the neck 3 there are stairs 5 to enter the cellar.

The segments 6 are joined by welding wherein a rigid and waterproof weld 7 is manufactured. Tests have demonstrated that polypropylene is a suitable material for the production of the segments 6 , which is sufficiently durable, tough, flexible and has good weldability. The suitability of this material was confirmed by model and prototype testing. Tests have also confirmed that an extruder is the most suitable to weld the segments £T and the weld 7 is manufactured by melting a polypropylene wire. The welded spherical container 2 is subjected to a waterproof test.

Fig. 2 shows the neck 3 terminated by an oval opening 4 to enter the plastic cellar 1 There are stairs 5 made in the neck 3. It has been shown that the cross- section of the neck 3 terminated by an oval opening 4 is the most advantageous from an ergonomic point of view.

Fig. 3a shows the geometric shape of the segment 8 ^' ; and Fig. 3b shows the shape of the segment 8” with adjusted ends ready to be mounted, with the base and the ceiling of the spherical container 2 having the shape of a hexagon or an n-gon, which also implies the adjustment of the ends before mounting. The segments 6 and fT are symmetrical along the longitudinal axis and are cut using a template. Tests have proven that the optimal number of segments is 21 while having the base circle diameter of 2280 m at a straight projection. Of course, the number of segments depends on the size of the spherical plastic container 2. If necessary, the interior of the spherical plastic container 2 is provided with special shelves which also serve as reinforcements.

It is clear that such production requires certain know-how, i.e. a set of production knowledge which the inventor and applicant gained during the creation of a model and a prototype.

Industrial Applicability

The technical solution has sufficient applicability in the production of plastic cellars containing a plastic container in the shape of a sphere, by replacing the single unit with welded segments to create its shell. This reduces the production costs and allows production in less expensive plants as wells.