FR2507658A1 - Burial casks or vaults made by extrusion blow moulding - of high density polyethylene, to reduce wt. and cost by comparison with concrete or GRP structures - Google Patents

Abstract

Vaults, for burials, are prefabricated as hollow generally box-shaped structures by extrusion blow moulding of a synthetic material pref. high density polyethylene. Pref. the mouldings incorporate an opening for top or side access. Pref. the moulding walls feature horizontal grooves to accommodate metallic reinforcement straps and vertical channels to accommodate tubular stiffeners pref. made of PVC. Strong enough to withstand soil pressure and conventional monuments, lighter and more waterproof than conventional masonry or concrete vaults, cheaper than the corresp. glass fibre reinforced polyester resin structures for the same purpose.

Description

 The subject of the present invention is a new industrial product, a one-piece prefabricated cellar of the type essentially consisting of a substantially parallelepiped volume having at least one upper or lateral access opening.

 Cellars of the above type are in themselves well known and used on a large scale.

 A first family resides in vaults made of concrete, either in several elements assembled on site, or in the form of monobloc assemblies.

 The advantages are mainly their low cost price, due to the use of a very conventional material, and obtaining a finished product having excellent mechanical strength.

 The disadvantages are of two orders, respectively their weight, which is an obstacle in terms of transport and handling, and the lack of sealing, which is specific to any concrete construction.

 According to a variant, these concrete vaults can be poured on site.

 A second family consists in making vaults of the aforementioned type in polyester reinforced with glass fiber.

 The advantages of sealing and lightness are on the other hand strongly counterbalanced because of the very high cost of fa bricatior, of the vaults of this second family.

On the other hand these structures do not sufficiently withstand the mechanical stresses which are of two origins
- ground movements,
- weight of the funeral monument placed on the surface.

 For this reason it is then very often necessary to double this vault externally with concrete walls.

The invention proposes to remedy these various drawbacks by providing a cellar which has the following qualities
- low cost price,
- good mechanical resistance,
- ease of transport and handling,
- excellent sealing.

 This result is obtained in accordance with the invention with a prefabricated one-piece cellar of the type essentially consisting of a substantially parallelepiped volume provided with at least one upper or lateral access opening, characterized in that it is made of material synthetic by an extrusion blow molding process.

 Very advantageously it will be made of high density polyethylene.

 According to a preferred method of implementation, at least the longitudinal walls of the volume of the cellar will each comprise externally a plurality of tubes secured to said volume.

These tubes actually fulfill three functions
- they oppose by their rigidity to the bending of the wall under the effect of the push of the ground
- they can be filled with concrete which allows the cellar to be anchored to the ground on a previously poured screed, this prevents the assembly from rising in the event of poorly drained soil
- they directly bear the weight of the monument.

The invention will be better understood with the aid of the description below of an embodiment given by way of nonlimiting example, with reference to the appended drawings in which
- Figure 1 is a side elevational view of a vault according to the invention supporting a funeral monument;
- Figure 2 is a front view in partial section
- Figure 3 is a top view of the vault without the monument
- Figure 4 is an alternative embodiment of Figure 3
- Figure 5 is a perspective view of a cellar according to the invention as marketed.

 The cellar essentially comprises a parallelepiped volume (1) inside the coffins will be arranged successively one above the other.

 The volume (I) is provided with an access opening (2) shown here on the upper face of the cellar. However, this opening can be lateral, which is required in certain regions either for terrain requirements or to avoid having to move the monument.

 The cellar of course includes a cover (3) which adapts to this opening and which is secured by any suitable means, for example by snap-fastening, interlocking or sliding. This cover can also be simply placed on the cellar.

 According to horizontal plans, on this volu me (1) grooves (4) projecting inwards and on which the partitions (5) between the different boxes will bear. The coffins rest on these separations, or directly on the bottom of the volume (1) for the first date.

 These grooves (4) can also serve as a support for an internal metal reinforcement in the form of a belt (6), which can be useful in regions where the work on the ground is important.

 According to an essential characteristic of the invention, the volume (1) is provided at least on the longitudinal walls of a plurality of vertical tubes (7). These tubes can be in any number and possibly also be arranged on the front walls.

 In the variant of Figure 3, the tubes (7) are simple PVC tubes attached to the volume (1).

 In the variant of FIG. 4, the tubes (7 ') are slid into a housing integrally formed with the body of the cellar. The assembly is therefore carried out in a single extrusion-blowing operation.

 According to another variant, the tubes themselves may have come from material with the body of the vault.

 During the installation of the vault according to the invention, it will advantageously be possible to first produce a concrete screed at the bottom of the pit.

 Then we have a concrete iron which crosses each tube (7,7 ') and we fill these with concrete. We thus achieve a perfect anchoring of the cellar to the ground.

 The monument (8), as shown in Figures 1 e 2, preferably rests on a concrete frame poured above the vault and secured to the tubes or rests directly on the upper face of the tubes (7,7 '),

Claims (8)

 CLAIMS 1. One-piece prefabricated cellar of the type essentially consisting of a substantially parallelepipedal volume provided with at least one access opening, upper or lateral, characterized in that it is made of synthetic material by an extrusion process- blowing. 2. Cellar according to claim 1, characterized in that it is made of high density polyethylene. 3. Cellar according to any one of claims 1 and 2, characterized in that the volume (1) of the cellar has in horizontal planes grooves (4) projecting towards the inside of the volume and on which the partitions rest ( 5) between the boxes of said volume. 4. Cellar according to claim 3, characterized in that the grooves (4) serve as support for a belt (6) inner -metallic reinforcement. 5. Cellar according to any one of claims 1 to 4, characterized in that it comprises at least on its longitudinal walls a plurality of vertical tubes (7). 6. Cellar according to claim 5, characterized in that the tubes (7) are attached to the volume (1). 7. Cellar according to claim 6, characterized in that the tubes (7) are made of PVC. 8. Cellar according to claim 5, characterized in that the tubes (7 ') are integrally formed with the volume (1)