SE469661B - U-shaped form element for cast house foundation - Google Patents

Abstract

The invention concerns a U-shaped form element 1 for a cast house foundation, where at least the outer upright part 2 and the bottom part 3 of the said U-shaped form element 1 consist of an insulating, dimensionally stable and water-tight cellular plastic material through which water vapour can pass only with difficulty. According to the invention, the inner upright part 4 of the said U- shaped form element 1 is designed as a dimensionally stable wall 4 which is permeable to vapour, preferably water vapour. <IMAGE>

Description

A 69 6 10 15 20 25 30 35 ”i A disadvantage with the known U-shaped mold elements is that the mold element as a whole consists of a water-impermeable and water-impermeable foam material. The edge beams of the concrete slab represent a volume of concrete, which is limited on three sides by walls that are impermeable to water and impermeable to water vapor. This has led to difficulties in achieving a quick and efficient drying of the cast edge beams. Residual moisture in these can lead to a risk of moisture damage in the building erected on the foundation.

The object of the present invention is to provide a mold element for a cast housing foundation of the type indicated in the introduction which, while retaining the advantages of previously known U-shaped mold elements, enables a quick and efficient drying of the edge beams of the foundation and which enables a continuous discharge of moisture into the macadam layer for ventilation to the environment of both moisture and other possible gases.

This object is achieved by an embodiment in accordance with the following claims.

The invention is described in the following in connection with exemplary embodiments illustrated in the accompanying drawing.

Fig. 1 is a schematic cross-section through a mold element according to the invention with concrete cast in the mold element.

Fig. 2 schematically shows a mechanically ventilated foundation made using the mold element according to the invention for a house building resting thereon.

The U-shaped mold element 1 shown in Fig. 1 comprises an outer upright, preferably vertical wall 2, a substantially horizontal bottom wall 3 and an inner, upright, substantially vertical wall 4-69 661 wall 4. The bottom wall 3 can, as shown in the figure, extend past the inner wall 4 towards the interior of the foundation, but can also be terminated in line with the boundary surface facing the inner wall 4 towards the foundation.

According to the invention, the inner wall 4 extremely schematically illustrated in the figure is designed as a dimensionally stable wall, which is permeable to steam, preferably water vapor. The wall 4 is fixedly connected at the bottom to the bottom wall 3, for example by gluing, by screw joints or by some other conventional fastening method. Optionally, the inner wall 4 is connected laterally to the outer wall 2 by means of a rigid strut 5 to ensure that the inner wall is able to withstand the forces exerted by the inner macadam layer on the wall when filling the macadam before casting the concrete. Due to the fact that the inner wall 4 in the mold element is permeable to steam, the moisture in the concrete can migrate into the macadam layer where a lower partial pressure lines up, and by ventilation of the macadam layer is led away to the surroundings.

Several different embodiments of the inner wall 4 of the U-shaped form element 1 are possible within the scope of the inventive concept.

According to a possible embodiment, the wall is built up of upright perforated plates or sheets of plastic, preferably corrugated, perforated sheets or sheets of plastic, which are fixedly connected at the bottom to the bottom part 3 of the mold element. If corrugated, perforated plates or sheets of plastic are used, the wall is provided preferably on the inside facing side of the mold element with a nonwoven fabric or other impermeable fabric.

The corrugations then form vapor collection pockets which facilitate the drying out of the concrete. In this embodiment, it may be appropriate to brace the wall 4 at the top through a number of braces 5, as mentioned in the foregoing C \ Uf) C \ (Tx 10 15 20 25 30 35 ... å and schematically illustrated by dotted lines in Fig. 1.

According to another conceivable embodiment, the inner wall 4 consists of a wooden wool plate, which at the bottom is connected to the bottom wall 3 of the U-shaped element.

According to another conceivable embodiment, the wall 4 is made of expanded metal or mesh and is fixedly connected to the bottom wall 3 at the bottom.

According to a further conceivable embodiment, the inner wall 4 of the U-shaped molding element is made of the same insulating, water-impermeable foam material as its outer wall 2 and its bottom wall 3. The inner side of the U-shaped forming element must be formed with a number of recessed grooves, which are connected to a number of openings in said inner wall 4, which open on the opposite side of the inner wall 4. d v s inàt macadam layer. In this embodiment, the wall 4 on the side facing the inward element is provided with a meadow-permeable non-woven fabric 6 or the like.

Fig. 2 schematically illustrates a foundation prepared for the use of the U-shaped mold elements according to the invention for a house building resting on the foundation. As can be seen from the schematic illustration according to Fig. 2, the foundation is provided with a mechanical ventilation device with a fan and a duct system through which indoor air is sucked down through the macadam layer.

However, many other embodiments are possible with the use of the U-shaped mold element according to the invention stated in the following claims.

Claims (7)

10 15 20 25 30 35 469 661 PATENT REQUIREMENTS U-shaped molding element (1) for cast housing foundation, wherein at least the outer, upright part (2) and the bottom part (3) in said U-shaped element consist of an insulating, water-impermeable cell characterized by the inner upright part (4) of said U-shaped plastic material, mold element (1) is designed as a dimensionally stable, permeable wall for steam, preferably water vapor. U-shaped molding element according to claim 1, characterized in that said steam-stable, vapor-permeable wall (4) comprises perforated, preferably corrugated sheets or sheets of plastic, which are fixedly connected at the bottom to the U-shaped molding element. -shaped profile bottom part (3). U-shaped molding element according to claim 1, characterized in that said dimensionally stable, vapor-permeable wall (4) consists of a wooden wool plate, which can be fixedly connected at the bottom to the bottom part (3) of the U-shaped profile. U-shaped molding element according to claim 1, characterized in that said dimensionally stable, vapor-permeable wall (4) is made of expanded metal or mesh and is fixedly connected at the bottom to the bottom part of the U-shaped profile ( 3). U-shaped molding profile according to claim 1, characterized in that said dimensionally stable, vapor-permeable wall (4) is made of the same insulating material. water-impermeable materials such as the outer part (2) and the bottom part (3), the inwardly facing side of said wall (4) of the U-profile being formed with a plurality of recessed grooves communicating with openings in said wall. (4) which opens on the opposite side of the wall. 469 10 15 20 25 30 35 A U-shaped molding element according to any one of the preceding claims, characterized in that said molding stack, for any permeable wall on the wall inwards facing the inner side of the U-profile, is provided with a non-woven non-woven fabric. 7. A U-shaped molding element according to any one of the preceding claims, characterized in that said molding stable, for very permeable wall at the top through a rigid bracket, is connected to the upright outer wall of the U-profile.