A PROTECTIVE SHEET,IN PARTICULAR FOR A FOUNDATION WALL OR A FLOOR ON THE GROUND

Abstract: Protective sheet, in particular for a foundation wall or a floor on the ground, said sheet (1) being made of a relatively stiff plastics material. A large number of spaced knobs (2) protrude from one side (1A) of the sheet, whereby the other side (1B) obtains a corresponding number of recesses (2A). The knobs (2) have a centrally disposed crater-like portion (3), the narrowest end (3A) of which is flush with the other side (1B) of the sheet. Between adjacent recesses (2A) there is arranged an open channel (4) provided through forming such that on the said one side of the sheet there appears a corresponding ridge between the knobs. Externally of the other side of the sheet there may be arranged a filtrating canvas co-acting with said channels (4).

Description: A PROTECTIVE SHEET, IN PARTICULAR FOR A FOUNDATION WALL OR A FLOOR ON THE GROUND. The present invention relates to a protective sheet, in par- ticular for a foundation wall or a floor on the ground, com¬ prising a substantially planar sheet of suitable, relatively stiff material, e.g. plastics, where one side of the sheet has a large number of spaced protrusions constituted by knobs made through forming, whereby the other side of the sheet thereby obtains a corresponding number of recesses provided through said forming. The known so-called foundation wall sheets are presently used extensively as a covering of the foundation wall before fill masses are placed thereat. Where access to draining fill masses is poor, it is frequently an expressed wish to • ensure that the water pressure against the foundation wall becomes the least possible. Such additional drainage is not always that easy to provide by means of the known foundation wall sheets having knobs. Further, it may in certain cases be desirable to let the foundation wall sheet have knobs which not quite so easily yxeld-'due to external forces from e.g. the fill mass. Recently it has also been common to use these foundation wall sheets as a diffusion bar for a floor on the ground. With the prior art solutions, it is, however, necessary by spacing means to space the floor from the moi¬ sture bar, in order to provide sufficient ventilation or drainage under the floor. This is particularly important in the cases where a floor made e.g. from chip boards is used. Thus, the present invention has as an object to provide a pro¬ tective sheet providing a solution to the indicated drawbacks, and the introductory mentioned protective sheet is character¬ ised according to the invention in that the knobs have a cen- trally provided, crater-like portion, e.g. of truncated con¬ ical form, the wide end of which is integral with the upper part of the knob and the narrowest end of which is flush with the other side of the sheet, and possibly that between adjacent recesses there is provided an open channel OMPI made through forming in such a manner that on said one side of the sheet there appears a corresponding rib between the knobs and with a height less than the height of the knob. According to a further feature of the invention, said other side of the sheet is covered with a filtering mat or canvas, whereby the arranged channels effect drainage of filtrated water. Further features of the invention will appear from the sub- sequent description with reference to the attached drawings. Fig. 1 is a section of a protective sheet according to the invention. Fig. 2 is the cross-section II-II in fig. 1. Fig. 3 is the cross-section of fig. 2 related to a filtrating canvas. Fig. 4 illustrates the use of the protective sheet in a man¬ ner known per se. Fig. 5 illustrates the use of the protective sheet in con¬ nection with a filtrating canvas. Fig. 6 illustrates the use of the protective sheet as a moist bar for a floor on the ground. In fig. 1 there is shown a protective sheet, e.g. of rela- tively stiff plastics which may possibly before use be pre¬ sent in a rolled-up form. As indicated in fig. 2, knobs 2 protrude from the one side 1A of the sheet, said knobs hav¬ ing a centrally arranged crater-like portion 3 and where the bottom of the crater 3A is flush with the other side IB of the sheet. Between the recesses 2A provided through the forming of the knobs 2, ' there is on the other side IB of the sheet provided an open channel 4. On said one side 1A of the sheet there is thus a corresponding rib or ridge. The said channels 4 will, as regards a vertically disposed pro- tective sheet, extend between adjacent recesses 2A being arranged vertically above each other. However, there is - . nothing against the knobs being arranged in a different man¬ ner than that illustrated in fig. 1. Thus, the knobs of one 5 row of knobs could be shifted relative to the knobs in the adjacent rows of knobs. In the cases where the protective sheet is to be arranged in an environment having masses providing poor drainage, it may 10 be an advantage to arrange a filtrating canvas 5 on the said other side IB of the sheet. In fig. 4 there is shown a first mode of use for the protec¬ tive sheet 1, where, it is arranged in a traditional manner 15 with the knobs facing a foundation wall 7. Fill mass 6, e.g. broken stone or other mass having good drainage property is placed against the other side of the sheet. This draining mass may cause a substantial pressure against the sheet, wherefore the crater-like portion of the knob will effect a 20 stiffening of the knob itself and ensure the necessary dis¬ tance between the protective sheet and the foundation wall. The channel 4 will in addition effect further drainage along the other side IB of the sheet, wherefore the water pressure against the sheet is reduced. 25 In fig. 5, the mass 8 is in the form of mass having poor drainage capability, e.g. clay or fill mass containing earth. In this case it is desirable to arrange the filtration can¬ vas externally of the other side of the sheet, whereby water 30 being filtrated through the canvas escapes via the channels 4. The filtrating canvas 5 coact to prevent the channels 4 from being blocked by the mass 8. In this connection the crater¬ 35 like portion 3 of the knob 2 will effect further support of the canvas 5 and-prevent it from being pressed into the re¬ cess 2A. In fig. 6 there is shown a protective sheet 1 intended as \ moist bar for a floor 9, e.g. a floor made from plates of wood chippings. Sheet 1 is arranged on a castec layer 10 on the ground (not shown) . The channels 4 will in this case con¬ tribute to a certain ventilation between the floor plate 9 and the protective sheet 1. Further, the crater-like por¬ tion 3 of the knob 2 upon heavy point loads on the floor 9 contribute to the knob better withstanding such deforming forces.

Claims: C l a i m s : 1. A protective sheet, in particular for a foundation wall or a floor on the ground, comprising a substantially planar sheet of suitable, relatively stiff material, e.g. plastics, where one side (1A) of the sheet has a large number of spaced protrusions (2) constituted by knobs provided through form¬ ing, the other side (IB) of the sheet thereby obtaining a corresponding number of recesses (2A) provided through said forming, characterised in that the knobs have a centrally disposed crater-like portion (3) , e.g. of truncated conical form, the widest end of which is integral with the upper portion of the knob and the narrowest end (3A) of which sub¬ stantially is flush with the other side (IB) of the sheet, and possibly that between adjacent recesses (2A) there is arranged an open channel (4) provided through forming in such a manner that on the one side (1A) of the sheet there appears a corresponding rib between the knobs (2) and with a height less than the height of the knobs. 2. A protective sheet as claimed in claim 1, characterised in that said other side (IB) of the sheet is covered by a filtrating mat or canvas (5) , whereby said channels effect drainage of filtrated water. OMPI

Inventors: BERGSLAND JON
Applicants: BERGSLAND JON
Application year: 1982
Main classification: E02D31
IPC codes: E02D31, E04F15, E04F17