EP3988268A1 - Système de fabrication pour matériaux de construction à chambre creuse - Google Patents

Système de fabrication pour matériaux de construction à chambre creuse Download PDF

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Publication number
EP3988268A1
EP3988268A1 EP20203597.8A EP20203597A EP3988268A1 EP 3988268 A1 EP3988268 A1 EP 3988268A1 EP 20203597 A EP20203597 A EP 20203597A EP 3988268 A1 EP3988268 A1 EP 3988268A1
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EP
European Patent Office
Prior art keywords
recess
hollow body
tube
strip
cavity
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP20203597.8A
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German (de)
English (en)
Inventor
Georg Weidner
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to EP20203597.8A priority Critical patent/EP3988268A1/fr
Publication of EP3988268A1 publication Critical patent/EP3988268A1/fr
Pending legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B7/00—Moulds; Cores; Mandrels
    • B28B7/28—Cores; Mandrels
    • B28B7/30—Cores; Mandrels adjustable, collapsible, or expanding
    • B28B7/306—Cores; Mandrels adjustable, collapsible, or expanding pliable or extensible
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B7/00—Moulds; Cores; Mandrels
    • B28B7/28—Cores; Mandrels
    • B28B7/30—Cores; Mandrels adjustable, collapsible, or expanding
    • B28B7/32—Cores; Mandrels adjustable, collapsible, or expanding inflatable

Definitions

  • Precast concrete components are prepared in precast concrete works for use on construction sites.
  • the prepared precast concrete parts still have to be connected to one another on the construction site.
  • appropriate connection connections are already cast into the concrete element during the manufacture of the precast concrete parts, for example concrete loops.
  • the concrete loops are often stored in so-called storage boxes.
  • Storage boxes are sheet metal boxes that are mounted in the area of the formwork wall to form the concrete elements.
  • a section of a concrete loop integrated into the storage boxes is cast into the concrete part during concreting.
  • a second section of the concrete loop remains in a cavity created by the storage box, which is left out during concreting.
  • the section of the concrete loop left out in the cavity is in place available to connect them in a connecting joint, e.g. with a concrete loop of another concrete element.
  • the area can then be filled with grout or another hardenable building material.
  • a storage box is shown with a cross-sectional profile of an isosceles trapezoid, with the narrow side of the trapezoid facing the formwork wall.
  • the storage box is anchored in the concrete by edges or webs. The disadvantage of storage boxes is that they remain in the concrete part and cannot be reused.
  • DD 262 259 A1 For example, general-purpose components with a C-shaped cross-section and a potting pocket with a C-shaped cross-section are combined into supports. Two opposite potting pockets can be arranged using cross connectors. The grouting pockets and core cross-section can then be filled with concrete, mortar or another binding material.
  • the US 2016/0 123 004 A1 relates to building blocks made of concrete that have grouting pockets with undercuts for connection to other concrete building blocks. Two adjacent potting pockets together enclose a potting channel with an hourglass-shaped cross-section. A peg that is form-fittingly adapted to this casting channel is pushed into the casting channel to connect and align the building blocks.
  • each brick has a pocket, with two grouting pockets enclosing a chamber that accommodates a projection of an insulating layer that can be filled with grouting mortar.
  • Reinforcing bars can be cast into the casting chamber, which protrude at the ends and can be used as a transport aid.
  • the casting chambers with undercuts are formed by combining two adjacent bricks.
  • the DE 10 2017 213 618 A1 relates to a drainage device for draining rainwater with a channel body made of concrete (slot channel) with a plastic insert.
  • the insert is designed for cleaning purposes.
  • the watercourse is made of concrete along the body of the channel.
  • the invention is based on the object of improving the prior art and creating a way of producing a cavity, preferably with undercuts, in a concrete or building material component using one or more tools or aids that can be removed after production of the cavity characterized by reusability for the production of another cavity.
  • the solution is the manufacturing method specified in claim 1, the recess hollow body specified in claim 6 as a tool for carrying out the manufacturing process, the assembly and/or recess strip specified in claim 7 also as a tool for carrying out the manufacturing process, the tool set specified in claim 9 proposed for carrying out the production method, the arrangement specified in claim 10 for carrying out the production method and the use of a hollow body specified in claim 14 for producing a cavity in a building material component.
  • an optional further development of the manufacturing method according to the invention is that after the building material has hardened, the hollow body with the recess is changed further in terms of its diameter or its other extension in order to enable the hollow body with the recess to be detached from the inner wall of the cavity.
  • the diameter of the hollow body or its other extension is changed by changing the width of an axis-parallel longitudinal slot that penetrates the wall of the hollow body.
  • the width of the longitudinal slot can expediently be dimensioned or adjusted by inserting one or more wedge-shaped elements into the longitudinal slot.
  • the narrow or pointed or sharp edge of the wedge-shaped element and its increasing widening or widening, which is characteristic of the wedge shape, facilitates the insertion of the wedge-shaped elements into the initially narrow longitudinal slot.
  • a widening of the longitudinal slit and thus its change, dimensioning or adaptation can also be brought about by inserting an inner expandable tube or other inner expandable hollow body into the recessed hollow body.
  • a further specification of this variant of the method consists in first pouring in the two hollow bodies mentioned, which are preferably arranged concentrically/coaxially one inside the other, with fresh concrete which is still hardenable in order to form the component with the hollow space; After the fresh concrete has set or hardened, a further, optional manufacturing step is to pull the widening inner pipe or the inner hollow body out of the recessed hollow body, which is easily possible when producing the two concentrically nested hollow bodies with smooth plastic surfaces.
  • the recess tube or the other recess hollow body relaxes again after it had previously been subjected to a prestress when the widening inner tube was pushed in. With the release of this prestress, the recess tube can also be loosened or pulled out of the concrete component or its cavity.
  • the cavity can either be sealed with concrete or used for other components such as ventilation ducts of air conditioning systems.
  • the hollow body with recess is placed or fastened in the formwork or on a wall of the formwork indirectly via or together with a mounting and/or recess strip.
  • the recess hollow body is inserted or placed in or on the assembly and/or recess strip and/or tied to it or otherwise fixed or attached.
  • the wedge-shaped element or elements mentioned above are realized as a projection or projections of the mounting and/or recess strip, and this or these wedge-like projections cause the diameter or other extent of the recess hollow body to be changed.
  • the diameter of the recess hollow body thus widened under tension is attached to the strip, for example by means of cable ties. After the building material, in particular concrete, has hardened, the side of the formwork with the strip with the wedge element sitting on it is removed.
  • a prestressing of the recessed hollow body can advantageously be set by dimensioning the thickness or width of the at least partially wedge-like projection(s).
  • the slot width of the hollow body is changed by means of a flexible expansion hose that can be filled with pressure medium by inserting it into an opening of the slotted tube or hollow body and filling it with pressure medium or is emptied thereof, with a change in the recess hollow body in its diameter or in its other extent.
  • the recess hollow body is expediently attached to the mounting strip and/or recess strip using cable ties or other strand-like fastening means.
  • the recess hollow body is sprayed or provided with a separating agent on its outer surface before it is placed or fastened in or on the formwork or before the building material is introduced into the formwork in order to avoid adhesion to or a material connection with the building material .
  • a separating agent is known per se in precast concrete plants.
  • the hollow body with the recess is compressed or reduced in its diameter or in its other extent, for example by means of cable ties.
  • the resulting prestress can contribute to the hollow body, which is trying to relax again, coming into stable contact with the surrounding concrete or building material mass.
  • An expedient, optional embodiment of the invention consists in that a longitudinal strip is cut out or otherwise removed from the wall of the hollow body to form the longitudinal slot.
  • a prestressing of the recess hollow body that has arisen after the hardening of the building material is set or dimensioned via the width of the longitudinal slot.
  • an optional development of the longitudinal slot consists in the two opposite slot edges engaging or being able to be brought into engagement with one another, preferably by force - and/or form-fitting.
  • This can be specified in such a way that the longitudinal slit is designed as an overlapping longitudinal slit in that the two opposing slit edges lie on top of one another or overlap one another in the circumferential direction. They thus form an overlapping or covering area, which can prevent undesired particles, for example dirt, from entering the interior of the slotted tube.
  • a further expedient development of this idea is that at least one of these slot edges is designed with a stop shoulder formed by a gradation, on which the other opposite slot edge hits or can hit, is supported there and optionally rests or can rest with a form fit.
  • the recessed hollow body in particular the recessed tube, to be elastically and reversibly deformable and/or to produce it with plastic.
  • an optional variant consists of a channel or other recess on the outside of the strip or a strip jacket, which is preferably rounded in cross-section and/or preferably elongated, with the recess being designed for at least partial Recording and / or for holding a recess hollow body.
  • the mounting and/or recess strip is characterized by one or more elongated or axially parallel projections, preferably with a basic shape that is at least partially wedge-shaped when viewed in cross section, with the respective projection being designed to pass through the longitudinal slot of the recess tube or other recess hollow body.
  • the assembly and/or recess strip is provided with one or more fixing elements for mechanical and/or magnetic fixing to the formwork wall on one side or in an area that is assigned to a formwork wall.
  • mounting and/or recess strip is characterized by one or more transverse grooves running transversely to the longitudinal direction of the strip for inserting strand-like fastening means, for example cable ties, for fastening the recess hollow body (on the mounting and/or recess strip ).
  • strand-like fastening means for example cable ties
  • one or more cable ties or other strand-like means for looping and/or for holding and/or fastening the recessed hollow body to the mounting and/or recessed strip.
  • the tool set can be supplemented with an expansion hose that can be filled with pressure medium and/or with a widening inner tube or with another widening body, in particular widening inner hollow body, for insertion into the slotted recess tube or the slotted recess hollow body.
  • openings remain in the component, the closure of which is desirable. It is an advantage if these breakthroughs or openings are as circular as possible. Then conical plugs with O-rings or the like could be pressed into it for sealing.
  • the expansion body is designed as a multi-point support body, which is characterized in that it is distributed at several discrete points or locations, which are preferably distributed evenly over the circumference of the pipe or hollow body , presses against the inner wall of the recess hollow body.
  • the multi-point support body is based on a polygonal or star-like basic shape, in which the corner points or star points are convexly rounded or curved outwards for contact with a pipe inner wall with reduced pressure load for the purpose of form-fitting contact with a concave or inwardly curved pipe -inner wall.
  • Another optional embodiment of the arrangement according to the invention with recess-hollow body and assembly and / or recess bar is that an axially parallel longitudinal slot of the recess tube or other recess hollow body is penetrated by an elongated or axially parallel, preferably at least partially wedge-shaped and/or sword-like projection of the mounting and/or recess strip.
  • a further, optional variant of the arrangement according to the invention consists in the recess hollow body lying against the mounting and/or recess strip extending further than said strip and/or protruding beyond the latter, in particular transversely to the longitudinal direction of the strip.
  • This allows the advantageous effect of creating undercuts, for example in relation to an entry/exit gap of the cavity.
  • the undercuts serve to engage and anchor the anchoring of coupling means, for example double-headed anchors, which are guided through the entry/exit gap of the cavity.
  • an optional further development consists in the pipe used or another hollow body used being provided with a longitudinal slot parallel to the axis.
  • a tool set 100 according to the invention or an arrangement according to the invention comprises a mounting and/or cut-out strip 110 with a channel 112 designed as a depression, which extends on a longitudinal side of the strip.
  • the ledge has an outline which corresponds to or is at least similar to an isosceles or symmetrical trapezium.
  • the outer jacket 121 of the recess tube 120 can be sprayed with a release agent to avoid adhesion to the surrounding concrete.
  • the outer shell 121 is penetrated by a longitudinal slot 122, which extends parallel to the central longitudinal axis of the pipe over the entire length of the pipe (perpendicular to the plane of the drawing Fig. 1a ).
  • the recess tube 120 according to the example shown is inserted and turned in such a way that the longitudinal slot 122 of the channel 112 is preferably opposite the deepest area of the channel 112.
  • the tool set 100 has a flexible expansion tube 130 that can be filled with pressure medium, which in the arrangement shown is inserted into the recess tube 120 and is still in the pressureless or slack state.
  • Fig. 1b Another manufacturing step is that the expansion tube 130 is now filled with pressure medium, for example air or water, in such a way that the expansion tube 130 is elastically expanded. At the same time, this comes to rest against the inner wall of the slotted recess tube 120 and presses and spreads it open to a slot width SB via its longitudinal slot 122, which widens in the process. This is accompanied by an expansion of the recess tube 120 to an enlarged expansion diameter D2.
  • the assembly and/or recess strip 110 is fixed to a formwork 300 (not shown in more detail) with the recess tube 120 placed on it. In the further course of the method, this arrangement is surrounded within a formwork 300 with free-flowing fresh concrete that can still be shaped and hardened, the pressure within the expansion hose 130 still being maintained.
  • pressure medium for example air or water
  • the mounting and/or recess strip 110 which is particularly important due to its isosceles long sides 113 running apart towards the outside of the component 200 (see also Fig. 1a ) is promoted: In the course of pouring or embedding in concrete, these form an entry/exit gap 203 that narrows conically towards the interior of component 200 at least make their removal easier.
  • the embodiment according to Figures 2a-2d differs from the after Figures 1a-1d in that the mounting and/or recess strip 110 used has a sword-like projection 111 which, in the arrangement according to the invention, is inserted through the longitudinal slot 122 into the slotted tube or recess tube 120.
  • the longitudinal slot 122 is spread open according to the width B of the projection 111, so that the width B corresponds to the slot width SB.
  • the arrangement of recess tube 120 or slotted tube and mounting and/or recess strip 110 inserted therein with its projection 111 is filled with hardenable fresh concrete to form the concrete component 200 with cavity 201 (see Figures 2c and 2d ) surround.
  • the assembly and/or cut-out strip 110 is detached from the cut-out tube 120, with the projection 111 of the strip 110 being pulled out of the interior 124 of the cut-out tube 120.
  • This is accompanied by a shrinking of the previously expanded recess tube 120, taking on the smaller initial diameter D1, so that it detaches from the cavity inner wall 202 of the concrete component 200 and can be removed from the cavity 201 formed.
  • the embodiment according to Figures 3a-3d differs from the after Figures 2a-2d characterized in that the initial slot width SB1 of the longitudinal slot 122 of the recess tube 120 is greater than the cross-sectional width B of the bar projection 111, that the latter according to Figure 3a with play within the clear width of the longitudinal slot 122 is located.
  • the recess tube 120 is reduced in its transverse extent to the smaller shrink diameter D3, for example by means of cable ties or the like (not shown), with a correspondingly reduced, smaller slot width SB2 resulting for the longitudinal slot 122.
  • the recess tube 120 can suitably remain in the cavity 201 of the concrete component 200 as an additional insert or inner lining if the concrete component according to FIG Figure 3d to be used as a drainage channel chamber. If the recess tube 120 is designed to be reversibly elastic, it will tend to press against the inner wall 202 of the cavity due to its prestress, caused in particular by the previous reduction to the smaller shrinkage diameter D3, and to adhere to it with a force or frictional connection .
  • the use of the recess pipe 120 as an inner insert or inner lining for a drainage channel chamber has the advantage that the naturally smooth inner surface of the pipe, particularly in the case of plastic, promotes smooth drainage of dirty water or the like.
  • the dirty water can get into the interior of the recess tube 120 or the plastic inner lining formed with it via the longitudinal slot 122 that is present anyway according to the invention, and then flow on.
  • the recess pipe 120 can thus be a smooth inner liner for a concrete trough chamber.
  • the above statements apply Figures 1a-1d referenced, which apply accordingly.
  • the corners 204 and the adjoining undercut areas 205 are also formed in the hardened concrete component 200, which contribute to the reliable holding of the recess tube 120, for example as an insert or inner lining in the cavity 201 of the component 200 as a concrete drainage channel chamber.
  • FIG 6 is a (partial) selection of various coupling agents, including Double-headed anchor 150, shown, which can be used in connection with coupling chambers of two similar concrete components produced according to the invention for their permanent, statically functional connection.
  • figure 7 shows an arrangement according to the invention with a recess tube 120 and a support and/or recess strip 110, with a longitudinal projection 111 of the strip 110 extending over the length of the strip 110 being inserted through the longitudinal slot 122 of the recess tube 120 for spreading and prestressing the recess tube 120.
  • the free end area of the elongate projection 111 ends via a tapering area in a longitudinal edge which still maintains a distance from the wall 123 of the recess tube 120 .
  • the front view according to figure 9 shows a modified arrangement with a support and/or recess strip 110.
  • the modification opposite figure 7 is that the projection 111 of the strip 110 penetrates the interior of the recess tube 120 diametrically, with an edge formed by tapering at the upper end of the longitudinal projection 111 lying directly against the inner wall of the recess tube 120.
  • the strip 110 is provided with, for example, embedded magnetic elements 115 in a support or contact foot area 114 associated with the formwork 300 .
  • mechanical fasteners such as screws or nails can also be used, particularly if the formwork 300 is made of wood.
  • FIG 9 is the arrangement according to figure 8 shown in a longitudinal side view.
  • the strip 110 is penetrated in its transverse direction by a plurality of transverse grooves, through which cable ties 140 are guided and wound around the recess tube 120 in order to fix it to the strip 110 .
  • figure 10 shows how the arrangement according to the invention of recess tube 120 and mounting and/or recess strip 110 inserted therein is embedded in the cavity 201 of a concrete component 200 produced according to the invention after it has hardened.
  • FIG 14 is an example for the realization of the re Figures 1a-1d addressed expansion tube 130 illustrates.
  • a conventional, preferably flexible hose in particular a slack fire department hose, can then be used to widen the slotted recess tube 120 .
  • such a hose can be used alone as an elongated, flexible recess hollow body to form the cavity 201 as a coupling or storage or drainage chamber in the concrete component 200 .
  • the arrangement of recess tube 120 and inner tube 131 inserted therein can be removed from the concrete component by first pulling out the inner tube 131 .
  • the diameter of the recess tube 120 then decreases with the release of its previously assumed prestress, and the recess tube can detach from the concrete and can also be removed from the concrete component.
  • the remaining cavity in the concrete component can be used, for example, to accommodate supply lines or to form ventilation ducts for air conditioning systems.
  • the cavity in the concrete component can also be sealed with concrete.
  • FIG 16 shows the special variant of a slotted or recessed tube 120 according to the invention with an overlapping slot 122a.
  • the two opposite slot edges 122b, 122c lie at least partially one above the other in the circumferential direction of the pipe, thus forming an overlapping area within which dirt particles from a certain minimum size can no longer get between the two overlapping slot edges into the pipe interior.
  • a slot edge 122b can be provided with a stop 122d, which is formed by means of a stepped profile.
  • the stop 122d provides a contact surface for the longitudinal side of the opposite slot edge 122c, which the latter can impact or abut and bear against.
  • the recess tube 120 with an overlapping slot 122a or other longitudinal slot is widened from the inside by a three-point support body 132 inserted on the inside, with the overlapping slot 122a being able to be spread open if the three-point support body 132 is dimensioned accordingly.
  • This has three support humps 134, each of which extends radially in a star shape, preferably uniformly or symmetrically, from a central bore 133 and is rounded or convexly curved at its ends in such a way that they positively rest against the concave inner wall of the recess tube 120 and can press against it .
  • FIG 18 shows an arrangement according to Figure 3d .
  • the recess tube 120 (suggestedly sketched in dashed lines) has remained in the cavity 201 of the concrete component 200 expediently as an additional insert or inner lining.
  • the concrete member has slot-like openings (not shown) that align with slot 122 of recess tube 120, allowing rainwater or other foul water to flow through slot in concrete member 200 and through slot 122 in the tube 122 in the drainage channel chamber, so get into the cavity 201 of the concrete component 200 can.
  • the dirty water can get into the interior of the recess tube 120 or the plastic inner lining formed with it via the longitudinal slot 122 that is present anyway according to the invention and can then flow on.
  • the pipe 120 is held in the concrete component 200 by force or frictional engagement.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Forms Removed On Construction Sites Or Auxiliary Members Thereof (AREA)
EP20203597.8A 2020-10-23 2020-10-23 Système de fabrication pour matériaux de construction à chambre creuse Pending EP3988268A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP20203597.8A EP3988268A1 (fr) 2020-10-23 2020-10-23 Système de fabrication pour matériaux de construction à chambre creuse

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20203597.8A EP3988268A1 (fr) 2020-10-23 2020-10-23 Système de fabrication pour matériaux de construction à chambre creuse

Publications (1)

Publication Number Publication Date
EP3988268A1 true EP3988268A1 (fr) 2022-04-27

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Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1422347A (fr) * 1964-11-13 1965-12-24 Procédé pour la réalisation d'évidements au sein des plaques en béton obtenues par moulage
DE2250641A1 (de) * 1971-10-19 1973-04-26 Safeticurb Ltd Vorrichtung zur verwendung bei der herstellung von gegenstaenden aus beton mit durchgehenden kanaelen oder durchbruechen
DD262259A1 (de) 1987-06-29 1988-11-23 B K Lgm Veb Mehrzweckbauelement
DE10019502A1 (de) 2000-04-19 2001-10-25 Ziegelwerk Gundelfingen Gmbh Verbundziegel
JP2001309516A (ja) * 2000-04-19 2001-11-02 Sakata Construction Co Ltd Ｒｃトラフおよびその成形型枠
DE10228082A1 (de) 2002-06-18 2004-01-08 Gebr. Philipp Gmbh Verwahrkasten
KR20120016328A (ko) * 2010-08-16 2012-02-24 강말선 사각수로관 성형용 금형장치
US20160123004A1 (en) 2014-11-03 2016-05-05 Thomas K. Lightfoot Self-Aligning Interlocking Construction Blocks
DE102017213618A1 (de) 2017-05-22 2018-11-22 Birco Gmbh Entwässerungseinrichtung, eine Einlage für eine Entwässerungseinrichtung sowie eine Entwässerungsvorrichtung

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1422347A (fr) * 1964-11-13 1965-12-24 Procédé pour la réalisation d'évidements au sein des plaques en béton obtenues par moulage
DE2250641A1 (de) * 1971-10-19 1973-04-26 Safeticurb Ltd Vorrichtung zur verwendung bei der herstellung von gegenstaenden aus beton mit durchgehenden kanaelen oder durchbruechen
DD262259A1 (de) 1987-06-29 1988-11-23 B K Lgm Veb Mehrzweckbauelement
DE10019502A1 (de) 2000-04-19 2001-10-25 Ziegelwerk Gundelfingen Gmbh Verbundziegel
JP2001309516A (ja) * 2000-04-19 2001-11-02 Sakata Construction Co Ltd Ｒｃトラフおよびその成形型枠
DE10228082A1 (de) 2002-06-18 2004-01-08 Gebr. Philipp Gmbh Verwahrkasten
KR20120016328A (ko) * 2010-08-16 2012-02-24 강말선 사각수로관 성형용 금형장치
US20160123004A1 (en) 2014-11-03 2016-05-05 Thomas K. Lightfoot Self-Aligning Interlocking Construction Blocks
DE102017213618A1 (de) 2017-05-22 2018-11-22 Birco Gmbh Entwässerungseinrichtung, eine Einlage für eine Entwässerungseinrichtung sowie eine Entwässerungsvorrichtung

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