CA2110286A1

CA2110286A1 - Device for a detachable securing of formwork boards

Info

Publication number: CA2110286A1
Application number: CA002110286A
Authority: CA
Inventors: Hans-Peter Walser
Original assignee: Individual
Current assignee: Individual
Priority date: 1992-03-30
Filing date: 1993-03-11
Publication date: 1993-10-14
Also published as: ATE167542T1; EP0586639B1; CZ259393A3; SK285120B6; SK134093A3; WO1993020308A1; DE59308688D1; EP0586639A1; AU3624593A

Abstract

ABSTRACT
Proposed for detachably securing formwork panels, formwork boards, insulation and facade panels, breastbars (41), scaffolding brackets (61), etc., is a holding device (1) designed to be embedded and fixed in place in the concrete structure of the building. This holding device has one or more sockets (17,19) in which matching parts (33,40,51a,63) of the securing, support and/or gripping elements mentioned can be detachably inserted.

Description

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Device for a detachable securing of formwork boards The present invention relates to a device specifi-cally for a detachable securing of formwork boards, fa-cade and insulation panels, breastbars, scaffolding brak-kets and similar, including an anchorable holding part for the receipt of at least one securing, support and/or clamping element, a front end formwork with a device, a scaffolding breastbar and/or formwork structure with a ~, device and an arrangement for a securing of insulation and/or facade panels with a device.
; For the formwork encasing of lateral terminations of building structure parts, specifically of concrete floor slabs and similar, the formwork board which in general must be mounted vertically is secured by means of a threaded bolt connection onto the holding part which is to be embedded in concrete, such as described ; e.g. in the DE-GM-81 27 001.- This method is quite time ' consuming and the inserting of the screw thread into the thread of the nut is quite tedious because it is not di-rectly visible.
The CH-PS-624 446 describes a similar construction, where a support and/or securing element ~or a front end formwork is described, which for instance can be designed 7 angle or L-, resp. shaped. A drawback of this design is that metal parts projecting out of the concrete or the wall, resp. must be removed and the wall itself be re-worked.
In the CH-PS-625 589 a L-shaped angle iron with securing means for the mounting of a periphery formwork -is described whereby the angle iron is held at a distance . .

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- 2 - 211~286 from the floor slab formworkand the periphery formwork by distance pieces present at both legs in such a ~anner, that it is comp~letely emhedded in the concrete. The pro-posed securing means include a winged screw which must be screwed into a mother thread which, such as mentioned a~ove is quite disadvantageous at building sites.
A further drawback of all mentioned solutions is in that relatively expensive angle iron pieces are simply embedded in concrete without being in a position to serve any other purposes.
In the DE-35 12 768, finally, a formwork board se-curing device is described, in which the formwork or the individual boards, resp. are secured by means of a pres~
sing-on key. The pressing~on key is held by co~pletely pluggable, again removable securing means in an angle ironpiece whereby latter is also embedded in the concrete mass. The advantage of this device is that the securing means and the clamping wedge are completely removable and therefore no reworking whatsoever is needed. However, again a relatively expensive metal part is lost due to an embeddinq in concrete. This solution could incorporate the possibility of locating the metal part flush with the floor slab wall or side wall, resp., in order to possibly use it for further applications, indeed, but as generally known planar metal end terminations are undesirable be-cause of an inferior adherance for a placing of plasters and other covering layers.
It is, therefore, an object of the present invention to propose a securing device by means of which a fast set-ting and removing of formwor~s of lateral terminations at parts of structures is possible, which is cheap and is ;,., ,-, : , . :

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suitable for serving for further use or application, resp.
purposes at the building or during the duration of buil-ding~
In accordance with the invention this object: is sol-, ved by a device in accordance with specifically claim 1.
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i Proposed is among others a securing device, specifi-cally for a releasable securing of formwork panels, form-work boards, insulation and facade panels, breastbars, scaffolding brackets and similar, comprising an achorable holding part for the receipt of at least one securing support and/or clamping element, which is produced at least in part of a polymeric stock or polymeric material, resp.
~i Specifically suitable as polymeric materials are known mass plastic materials such as for instance poly-,q ethylene, PVC, A~S, polypropylene and similar, whereby obviously the selected plastic material must suit demands made for the securing part. Preferred is a inforced polymeric, such as specifically used by a glass fiber or glass pearls filled polymeric or a plastic material.
Fiber-reinforced concrete materials such as speci-fically glass fiber reinforced polymeric concrete mate-rials have proven to be suitable for the production of the inventive securing device. As example shall be men-tioned glass fiber or polyester fiber reinforced poly-meric concrete, whereby for instance polyester or epoxy resin additives are mixed to the known mineral binding agents.
The large advantage of the use of a polymeric mate-rial such as for instance a glass fiber reinforced mass .~ .
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plastic material or polymeric concrete in compari.son with metal is that it is substantially cheaper, is mo.~e easy to be handled, guarantees a simple and low cost production of the securing device and allows additionally the sup-porting device to be mounted flush to the floor slab or side formwork because plasters or covering layers feature a better adhering on plastic substrates than on metal end coverings.
Further proposed is a supporting device which com-prises one or several receiving portions for a pluggable, snappable and/or screwable mounting of securing, support and/or clamping elements, specifically for a releasable securing of formwork panels, formwork boards, breastbars, scaffolding brackets and similar.
Further preferred variants of embodiments of the in-vnetive securing device are characterized in the depen-dent claims 5 to 12.
The s~curing device claimed in accordance with the invention is suitable for a terminal face end formwork, such as specifically described and claimed in the DE-PS-35 12 768 the contents of which being herewith an inte-gral part of the present invention. A detailed descrip-tion of the securing device for a clamped securing of formwork panels or formwork boards for installing forms of lateral end closures of building parts such as des-cribed in the DE-PS-35 12 768 is not made and reference is made specifically to this prior art.
The securing device proposed in accordance with the invention is, furthermor~, suitable for a scaffolding breastbar andlor formwork construction according to the ` 211~28~

wording of claim 12. In this context reference is spe-cifically made to the CH-PS-678 081, in which scaffolding and breastwork constructions on building structures and also their anchorings in or at the wall structure is ex-tensively described, wherewith the CH-PS-678 081 is also an integral part of the present invention. In this con-nection reference is made to the figs. 6, 7, 9, 10 and 11 of the CH-PS-678 081.
Finally, the securing device suggested in accordance with the invention is also suitable for the securing of insulation or facade, resp. panels. Correspondingly pro-posed is an arrangement for securing of insulation and/or facade panels, including at least one inventively defined device, whereby one or several receiving members are fore-seen at the diQvice into which corresponding portions of ~ -the insulation and/or facade panels can be inserted in order to mount same to the device.
Hereinafter, now, the invention will be explained by example more in detail with reference to the appended fi-gures, whereby:
Fig. 1 illustrat:es perspectively an inventive plas-tic securing part with securing means for formwork boards according to the DE-35 12 768, Fig. 2 illustrates a further inventive securing part with anchoring element, Fig. 3 illustrates the securing part of claim 1, seen perspectively from the opposite side, Fig. 4 illustrates the securing part according to Fig. 1 in a side view at a roofing to be concreted having a lateral termination and mounted formwork in a side view, -:

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Fig. 5 illustrates perspectively a plurality of elements for an inventively defined scaffolding breast-work and formwork structure, Fig. 6 illustrates, designed schematically perspec-tively, an insulation formwork arrangement which is moun-i ted to an inventive plastic securing part, and ;, Fig. 7 illustrates the outer insulation mounted ~i firmly by means of plastic securing parts.
In Fig. 1 an inventive securing device is illustra-3 ted perspectively, including a supporting part 1 foreseen i to be embedded in concrete, which is produced preferably at least to a large extent of a polymeric material, such as for instance a glass fiber reinforced mass plastic ma-~j terial such as polyethylene, PVC or ABS. Obviously, other polymeric materials or plastic materials, resp.
-~ are suitable, too, such as for instance polypropylene, polyamide and similar, whereby these plastic materials ~ are hardly selected due to cost reasons.
-1 Fiber reinforced concrete has also been proven to be suitable, such as for instance glass fiber reinforced po-lymeric concrete, in which unsaturated polyester resins replace the binding agents known form the common concrete, such as cement and water, in order to obtain a substan-tially higher strength. Obviously, other fibers can be used in place of glass fibers, such as polyester fibers, polyamide fibers, carbon fibers and similar, and in place of unsaturated polyester resins, epoxide resins, poly-urethane resins or similar are obviously also suitable for the production of the polymeric concrete. Specifi-cally, in case that increased demands are made on such supporting parts, it is possible to use these high-grade - 7 - 2 1 1 0 2 8~
, plastic materials, reinforced by mentioned high-grade fibers of polyester, polyamide, carbon, etc. If neces-sary, the supporting part is to be made of metal.
The supporting part 1 is of a L-shape and comprises a longer leg 3, which rests preferably with a bearing area 11 stable on a floor slab form 9 or a crown of a wall 7. For a securing of the longer leg 3 on the floor slab form 9 securing means 13 are foreseen such as for in-stance screws, nails and similar. The other leg 5 at which the at least partly flush abutting formwork boards or formwork panels, resp. are to be arranged, includes preferably a tube and square shaped holding fixture 19 into which the also square shaped plug-in part 33 o~ a plug-in yoke 31 can be inserted. The plug-in yoke 31 includes further a plug-in beam 39, a wedge leg 36 and a clamping wedge 35, including a clamping surface 37 for a c~amping of formwork boards at the outer side of the vertical leg 5 of the supporting part. The vertical leg 5 includes further respective at the side longitudinally extending notchings or groove resp. or notch 16, the reason and function of which will be entered into more in detail with reference to Figs. 6 and 7.
How the mounting of a formwork board by means of an inventive plug-in device such as illustrated in Fig. 1 proceeds, will be explained later with reference to Fig. 4.
Since the supporting part 1 is foreseen to be embed-ded in the concrete in the building structure or in a floor slab, resp. and in order to prevent a breaking out of the supporting part after the removal of the ~ormwork, rib projections and similar are preferably located there-on, which are backfilled or filled out, resp. by the con-, '~ - 8 - 211~28 , crete mass. For this reason the supporting part 1 in Fig. 1 includes a rib 15 which can act simultaneously, for instance by means of a metal covering 21 as reinfor-cing rib in order to reinforce the L-shaped suppo ting part 1 in its apex.
In order to plug in for instance scaffolding brackets or holding parts for breastworks, the horizontal leg 3 in-cludes also a sleeve or tube shaped holdins fixture 17a, whereby its opening 17 is located at the outer side of the building structure and accordingly is not visible in Fig. 1.
In Fig. 2 again an inventively defined supporting part 1 is illustrated, again suitable for instance for a plugged in receipt of a plug-in yoke which is not illus-trated in Fig. 2. Contrary to the supporting part 1 of Fig. 1 the holding fixture 19 is arranged in the v~rtical leg of the supporting part at the outer side and flush with the face side of the building structure, wherewith a formwork board abuts directly the sleeve or tube, resp.
holding fi~ture 19.
The supportlng part 1 according to Fig. 2 includes further two reinforcing bars or mounting supports, resp.
23 and 25, whereby the latter are mounted in a sleeve 27 at the leg 5. These reinforcing bars or mounting sup-ports, resp. 23 and 25 allow an additional stabilizing of the supporting part 1 in the building structure which may become necessary specifically when pluggins breast bars or scaffolding brackets into one of the two holding fixtures 17 or 19.

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In Fig. 3 a supporting part is again illustrated, per-spectively from the opposite side in comparison with Figs. 1 and 2. The supporting part rests in the shown il-lustration on a crown of a wall 7 and on a floor ~lab formwork 9. The opening 17 of the sleeve or tube, resp.
shaped holding fixture 17a is now excellently visible at the front side, which fixture is set in thehorizontal leg 3 of the supporting part 1. The supporting part l in-cludes, furthermore, at its vertical leg at the front side holding fixture openings 1~a, 18b and 18c in which any kind of supporting elements, screws and similar can be mounted. In this way it is for instance also possible to mount in a screw like manner formwork boards in a con-ventional way to the supporting part 1. Also too:l bo~es, apparatuses and similar can be hooked into or mounted to, resp. the supporting part 1.
Finally and much more important is the pluggable or snappable mounting of breastwork bars or scaffolding brak-kets, resp. in the twc openings 17 and 19, whereby it is important that all holding fixtures and their openings are also in such a case freely accessible when the supporting part 1 is embedded in concrete in the building structure.
In Fig. 4 now, the arranging of the securing device according to Fig. 1 for the placing of a formwork and for producing a concrete floor slab is illustrated, whereby ~-the upper surface of the floor slab to be produced is de-signed with broken lines and identified by the reference numeral 23. The supporting part 1 will be arranged on the floor slab form and the crown of the wall 7 of the front wall 7a and secured for instance by nails. ~ow -~
the plug-in ~oke 31 is inserted with the plug-in part 33 into the tube shaped holding fixture 19 and a formwork ;.-, . ~, , .
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board 38 is clamped by means of the clamping wedge 35 at the front side onto the leg 5 of the supporting part 1.
The concrete floor slab to be produced is thereby such that the upper surface 23 comes to lie just flush rela-tive to the opening of the holding fixture 19, wherewith after the concrete floor slab has been completed, the plug-in yoke can easyly be retrieved from the supporting part 1, wherewith the holding fixture 19 continues to be freely accessible from the outside. The same is true for the opening 17 and the holding fixtures 18a and 18c, resp.
after the formwork board 38 has been removed from the front face side of the leg 5. Accordingly, it is then possible to insert into mentioned openings or holding fixtures, resp. any kind of parts which can be snapped in, screwed in or plugged in.
In Fig. 5 various parts of an inventive scaffolding breastwork and formwork structure are illustrated, in-cluding primarily the inventively defined supporting part 1 and also the plug-in yoke 31 illustrated in the Figs. 1 and 4.
~ or the erecting of a breastwork or a guard rail, resp. at the outer side of the buildins structure it is possible to insert a breastwork bar 41 with the corres-ponding plug-in part 40 either into the holding fixture 19 or a corresponding holding fixture 39 at the plug-in yoke 31, on which bar holding elements 43 are foreseen, for instance for a placing of guard rail boards.
In an analog manner it is possible to plug into the holding fixture 17 a holding element 51 by means of its plug-in portion 51a, whereby a holdins fixture 53 is fore-seen at this holding element 51 at its front side and directed vertically upwards for a plugged-in arranging ".
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again of a breastwork bar 41. ~y means of (not illustra-ted) snap-in elements at the portion 51 a slipping out of the holding fixture can be prevented.
~ inally, after removing the formwor~ from the con-crete floor slab, it is also possible to insert a scaffol-ding fixture 61 into the holding fixture 19 whereb~ such proceeds ~lith the plug-in part 63. The scaffolding fix-ture 61 includes a horizontal beam 69 for the mounting of floor boards, a support 67 for a lateral supporting of the scaffolding fixture at the building structure and at the i~
front side a holding fixture 65, as well, in order to also locate a breastwork bar 41 at the scaffolding fixture.
Fig. S illustrates a possible variant of an inventive scaffolding breastwor~ and formwork design with an inven-tively defined supporting part which is foreseen to be concreted into the building structure. This supporting part is produced preferably of a reinforced plastic ma-terial, such as for instance polyethylene or PVC, it can, however, also be made of metal. Obviously, also the other structural parts can be made of metal or the mentioned plastic material. Due to the high strength figures of such structural parts which can be obtained, also made of a reinforced platic material, it is in case of a cor-responding dimensioning of the individual parts b~ all means possible to produce same from mentioned plastic material. The large advantage Oc a producing of all these parts from plastic material consists at the one side of the fzvorable producing thereof and at the other ~-side of its low weight which can be of quite a large ad- -vantage during the handling and the transport.

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~ lith regard to the design of scaffolding brackets and guard rails reference is made specirically to the CH-PS-678 881 in which such designs are illustrated among others in the Figs. 6, 7, 9,10 and 11.
In the Figs. 6 and 7 the significance of the Longi-tudinal groove or notching will now be entered into which already has been mentioned under reference to Fig. 1. It is namely illustrated in the Figs. 6 and 7 that at the in-ventively defined securing device 1 there also exists the ~i possibility to mount insulation and supporting, resp. pa-nels to be placed at the outside of the building struc-ture, which can simultaneously serve as formwork for the front terminal area of the floor slab to be encased.
In Fig. 6 again an inventive securing device lying on a floor slab formwork 9 and on the wall structure 7 is arranged, which such as mentioned comprises at both sides of the vertical leg grooves or longitudinally designed notchings, foreseen for the insertion or plugging-in, resp. of the two projecting portions 74 of insulation ~, reinforcement panels 71 which can be made for instance of wood cement. The actual insulation layer 72, consist-ing for instance of polystyrene or any other material suitable for insulating is arranged bonded or screwed thereonto. The mounting panels 71 can include, further-more, for instance pin like elements 75 which can be in-serted into corresponding receiving openings 16a in the securins device 1.
In Fig. 7 it is now shown how such an insulation also serving 25 edge encasement formwork can be arranged by means of the inventively defined supporting parts 1, made of metal or plastic material. Again two supporting _ 13 _ 2~1028~

elements are located on the floor slab formwork 9 and the balustrade of the wall 7, whereby the insulation con-sisting of the mounting plate 71 and the insulation layer 72 are already firmly mounted by one supporting element 1.
At the other supporting part 1 the mounting proceeds in the direction of the arrow. Along the outer surface of the wall the insulation finds the corresponding continua-tion by a placing of further insulation panels 7~a which for instance can be covered against the outside by a se-cond wall structure 77. The outer covering can, however, - be also made by a mat reinforced PVC or cement insulation.
~' The large advantage of the edge formwork according to Figs. 6 and 7 is that after the concrete floor slab has been made no removing of the formwork is necessary. ~lore-over, it is obviously also possible to place at the sup-porting element 1 in the Figs. 6 znd 7 in the upper ope-ning 19 a breastwork bar for erecting of a safety breast-work along the building structure.
At the securing devices illustrated in the Figs. 1 to 7 it is a matter of examples which can be altered, modi-fied or completed somehow or other by further parts. Pre-ferably the supporting part illustrated in the example is made of a reinforced polymeric material where by it is to be mentioned specifically ~ith reference to Fig. 5 that the inventively defined and claimed scaffolding breastwork and formwork structure is also by all means suitable to be arranged in a metal supporting part. The design of the individual scaffolding breastwork and form-work elements can also be made somehow or other.

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Claims

CLAIMS:

1. Device, specifically for a releasable securing of formwork panels, formwork boards, facade and insulation panels, breastwork bars, scaffolding brackets and similar, including a substantially L-shape designed anchorable sup-porting part fabricated of a polymeric material, for the receipt of at least one securing, supporting and/or clam-ping element, characterized in that the one leg (3) fore-seen to rest on a support (7, 9) comprises a bearing sur-face (11) for a stable resting on the support.

2. Device, preferably according to at least one of the claims, such as according to claim 1, characterized in that the supporting part (1) is produced of a suitable plastic material, such as specifically polyethylene,PVC, ABS, polypropylene or another mass plastic material.

3. Device, specifically for a releasable securing of formwork panels, formwork boards, facade and insulation pa-nels, breastwork bars, scaffolding brackets and similar, including a substantially L-shape formed, anchorable sup-porting part produced from a polymeric material for the receipt of at least one securing, supporting and/or clam-ping element, characterized in that the supporting part (1) is produced from a reinforced polymeric, such as spe-cifically a glass filled polymeric.

4. Device, preferably according to at least one of the claims, such as according to one of the claims 1 to 3, characterized in that the supporting part (1) is pro-duced from a fiber reinforced concrete such as specifi-cally a glass fiber reinforced polymeric concrete.

5. Device, specifically for a releasable securing of formwork panels, formwork boards, facade and insulation pa-nels, breastwork bars, scaffolding brackets and similar, preferably according to one of the claims, characterized in that the supporting part comprises one or several re-ceiving portions (16, 16a, 17, 18a, b, c, 19) for the pluggable, snappable and/or screwable mounting of securing supporting and/or clamping elements (31, 41, 51, 61), spe-cifically for the releasable securing of formwork panels, formwork boards (38), facade and insulation panels (71, 72), breastwork bars (41) and/or scaffolding brackets (61).

6. Device, preferably according to at least one of the claims such as one of the claims 1 to 5, characterized in that securing means (13) are foreseen at one leg (3) in order to anchor or secure, resp. the supporting part (1) on a floor slab formwork (9) and/or at the crown (7) of the wall.

7. Device, preferably according to at least one of the claims, such as according to one of the claims 5 or 6, characterized in that the supporting part is designed to be embedded in concrete, whereby the receiving portions (16, 16a, 17, 18a-c, 19) are arranged in such a manner at the supporting part (1) that at least a part of these portions remains freely accessible from the outside after completion of the embedding in concrete.

8. Device, preferably according to at least one of the claims, such as according to one of the claims 1 to 7, characterized in that projecting portions (15), notchings and/or reinforcement elements (23, 25) are arranged or formed, resp. at the supporting part (1) in order to be backfilled or filled out during the embedding in concrete, such that the supporting part is firmly anchored in the concrete.

9. Device, preferably according to at least one of the claims, such as according to one of the claims 5 to 8, characterized in that the other leg (5) comprises a tube shaped holding fixture (19) open towards the top suitable for a pluggable insertion.

10. Device, preferably according to at least one of the claims, such as according to one of the claims 5 to 9, characterized in that a tube shaped element (17a) is ar-ranged integrally in the one leg (3) open in the outer si-de of the other leg for the pluggable inserting or snapp-able or screwable securing of a breastwork bar (51) or a fixture (61) for a scaffolding bracket (61).

11. Device, preferably according to at least one of the claims, such as according to one of the claims 1 to 10, characterized in that respective lateral receiving por-tions (16, 16a) are foreseen in the other leg (5) for a lateral securing of formwork boards or panels and/or buil-ding structure end terminations or insulating panels (71, 72).

12. Device, preferably according to at least one of the claims, such as according to claim 11, characterized in that the lateral holding fixtures include notchings or grooves (16) extending substantially in the legs longi-tudinal direction into which formwork boards, -panels, building structure end terminations and/or insulation pa-nels are set in for a securing.

13. Device, preferably according to at least one of the claims, such as according to one of the claims 5 to 12, characterized in that at least one reinforcing rib (21) or flap, resp. or a diagonal strut is located at the legs abutting the respective inner surface or intercon-necting the legs at the inside.

14. Front end formwork with a device preferably ac-cording to at least one of the claims, such as according to one of the claims 1 to 13, and with securing means (31), as well for a clampable securing of formwork boards (38) or formwork panels at the outer side of the other leg (5) at the supporting part (1).

15. Scaffolding breastwork and/or formwork structure, preferably with a device, specifically for a releasable securing of formwork panels, formwork boards, facade and insulation panels, breastwork bars, scaffolding brackets and similar, including an anchorable supporting part for the receipt of at least one securing, supporting and/or clamping element, including at least a scaffolding brak-ket holder (61) and/or a breastwork bar (41) and/or a securing means (31) for a front aned formwork, whereby at least one portion (33, 40, 51a, 63) is foreseen at the respective scaffolding bracket holder, the breastwork bar and/or the securing means in order to again be releasably insertable, snapped in or screwed into or onto the sup-porting part.

16. Arrangement for securing of insulation and/or facade panels, preferably with a device, specifically for a releasable securing of formwork panels, formwork boards, facade and insulation panels, breastwork bars, scaffolding brackets and similar, including an anchorable supporting part for the receipt of at least one securing, supporting and/or clamping element, characterized in that the in-sulation and/or facade panels (71, 72) are each provided with at least one portion (74, 75) by means of which at least one respective panel is mountable at a receiving portion (16, 16a) at or in the device (1).

Due to the international search report of 14 May 1993 specifically claims 1, 3 and 6 of the present patent application were amended.
It has been specifically the matter of defining the present patent application against the european patent application 0 352 658 cited in the international search report, in which patent application a supporting bracket analogous to the supporting part of the present patent application is also claimed and described, resp. The supporting bracket claimed in the EP-A 0 352 658 incor-porates various specific structural features and inclu-des among others distance pieces 14 at the longer wall leg 3, such as for instance described and claimed in the Swiss patent 625 589. By these distance pieces 14 it is ensured that at least the wall leg is completely enclosed by or completely embedded in concrete when making the floor slab. Additionally, it is mentioned in said euro-pean patent appliation that the supporting bracket can be produced preferably of a plastic material in order to counteract for instance the forming of rust or also the forming of low temperature ruptures. A reference to suitable plastic materials is missing completely.
In contrast thereto it is in accordance with the present international patent application decisive that the supporting bracket is placed without the mentioned distance pieces such that the supporting bracket is not completely embedded in concrete. By means of this it is for instance ensured that areas arranged at the sup-porting bracket which are suitable for the receipt or the arranging, resp. of mounting supports, securing elements or similar are not also embedded in concrete, but rather are accessible from the outside also after the completion of the concrete floor slab. For this reason it is decisive for the invention that aside from the design of the supporting part of a polymeric material the leg foreseen for the resting on a support includes a planar resting portion in order to ensure a stable res-ting on the support, and at the other side to ensure that the supporting part is not completely embedded in con-crete at least along this planar portion. Furthermore, specifically suitable polymeric materials are set forth in the claims 3 and 4 which are generally suitable for the production of supporting brackets such as for in-stance also claimed in the european patent application 352 658. It involves, thereby, reinforced polymerics, such as glas filled polymerics or fiber reinforced con-crete.
These special structural features and properties of the inventive supporting part of the international patent applicaton PCT/CH 93/00066 constitute a decisive improve-ment over the holding brackets according to the prior art, allow after all a substantial broadening of the application possibilities at simultaneously rather reduced costs.