EP1630300A1 - Waterprotected basement - Google Patents

Abstract

The section has a sealing path (DB1) passing through a lower side of a concrete-base plate (BP) and forming a creep-waterproof bordering surface with the plate. Another sealing path (DB2) passing through a wall arrangement between a concrete layer of an inner shell and an outer shell and forms another creep-waterproof bordering surface with the layer of the wall arrangement. The sealing paths overlap each other. An independent claim is also included for a method for manufacturing a basement tank as a concrete-construction unit.

Description

The invention relates to a building part with a concrete floor slab and a wall assembly, a suitable for such a wall assembly precast wall element and method of manufacturing the building part and the finished part wall element.

The invention relates in particular to waterproof basement as a structural part. Such basements typically have an integrally continuous concrete slab as a base plate, along the edge of which a wall arrangement projects upwards and surrounds an interior on several sides. The basements may be partially or completely lowered below the floor level and in particular also at least in a lower area often or permanently surrounded by water.

To seal such basements against the ingress of surrounding water, various measures are in use, it is also known to einzubetonieren for sealing joints between consecutively concreted on-site parts, especially floor joints between the base plate and then on this concrete wall arrangement, webs, which with a waterproof Sealing compound are coated, which forms a Kriechwasserdichte interface with hardening fresh concrete. The sealant may in particular contain bitumen and / or resin as an essential constituent. A particularly advantageous composition of such a sealant is described for example in EP 796951 B1 as a coating on a plastic film. At vertical joints of adjacent wall sections could be provided according to vertical sealing elements. While the seal on such web plates and sealing elements typically referred to as white tub Constructs are made in so-called black tubs under the bottom plate and on the wall outer surface at least up to the level height outside pending water closed continuous waterproof sheets or coatings are provided. Such black tubs are usually associated with high effort and high care requirements on the site. A leak in the outer seal can lead to uncontrolled spreading of water within the seal and excessive moisture penetration of the basement construction. Also, using the known from EP 796951 B1, the construction site cost is high and, albeit to a lesser extent, error prone.

The known structural parts of this type can be created partially or completely by means of built in the construction site formwork fresh concrete or using dimensionally prepared precast elements, the finished parts can be designed especially for the wall assembly as multi-shell hollow elements, which on site with fresh concrete fill out.

In addition to the seal against water may also be provided a thermal insulation, for which typically prepared plates of heat-insulating material as a support under the bottom plate and / or fixed from the outside to the wall assembly.

The invention has for its object to provide a building part of the aforementioned type with high reliability of the waterproofing, a suitable prefabricated wall element and manufacturing method for the building part and the finished wall element.

Solutions according to the invention are given in the independent claims. The dependent claims contain advantageous refinements and developments of the invention.

By provided in addition to a first geomembrane on the underside of the concrete floor slab second geomembrane within the wall assembly between a concrete layer of an inner shell of the wall assembly and an outer shell of the wall assembly and the substantially abutting or overlapping connection of the first geomembrane and the second geomembrane results in a substantially closed trough-shaped seal, in particular at under the lower edge of the inner shell extending laterally to the deeper reaching second sealing sheet bottom plate.

Under geomembrane is here in each case a planar, advantageously flexible, preferably waterproof carrier, in particular a plastic film understood, which is provided at least on a concrete layer side facing a sealing material of the introductory already described and known per se, which with hardening fresh concrete a creep-water-tight interface is known, for example, from EP 796951 B1. In the apparatus according to the invention, such a creep-water-tight interface is thus between the first geomembrane and the bottom plate and between the second geomembrane and the concrete layer of the inner shell of the wall assembly and advantageously between the deeper than the lower edge of the inner shell reaching portion of the second geomembrane and the Bottom plate, given in particular its side edge surface. The flexible carrier of the geomembrane can also advantageously contain a thin aluminum layer as vapor diffusion barrier.

The second sealing sheet is advantageously glued to the outer shell, wherein an adhesive layer can also be given by a film of the second sealing web is provided on both sides with the sealing material, which acts strongly adhesive by the bitumen. The outer shell is advantageously inherently dimensionally stable. The outer shell is advantageously at least predominantly made of a heat-insulating material, in particular a rigid foam material. The average specific gravity of the material of the outer shell is advantageously less than 0.2 g / cm ³ , in particular less than 0.1 g / cm ³ . By the execution of the outer shell as thermal insulation material advantageously a thermally insulated structural part is advantageously achieved, in particular with simultaneous thermal insulation of the bottom plate by a support surface designed as a support under the first sealing membrane thermal insulation material.

The wall assembly is advantageously connected by means of the interface between the bottom plate and the bottom edge of the wall assembly bridging connection devices, which are advantageously anchored in a concrete layer of the wall assembly and in the concrete layer of the bottom plate. The connecting devices may for example contain conventional reinforcing elements. In an advantageous embodiment, the connecting devices also contain support elements, which support the wall arrangement above the foundation at a vertical distance from the first sealing web before casting the bottom plate. The upper level of the bottom plate is advantageously higher than the lower edge of the inner shell of the wall assembly, in which case the step formed in the bottom plate along the wall assembly advantageously acts laterally supporting the wall assembly against externally pressing water and soil. The height of the step is advantageously a few centimeters and is preferably in the range between 1.5 cm and 4.5 cm.

The wall arrangement is advantageously composed of a plurality of, preferably flat prefabricated wall elements. In a first advantageous embodiment, the inner shell of the wall elements is subdivided in the direction of the wall surface normal into a core concrete layer facing the second geomembrane and an inner wall panel facing away from the second geomembrane and facing the surrounding inner space. Inner wall plate and core concrete layer are advantageously connected by a common wall reinforcement. In a particularly advantageous manner, in the manufacture of such wall elements, the outer shell provided with the second geomembrane and the inner wall panel already supporting the wall reinforcement may define a cavity opposite one another in which the wall reinforcement protrudes and which is filled with fresh concrete which hardens to the core concrete layer and thereby forms the Kriechwasserdichte interface with the sealing material of the second geomembrane. The inner wall panel with the wall reinforcement can be previously prepared in a conventional manner as a lattice girder or so-called filigree. Inner wall plate and outer shell act as shuttering elements for the core concrete layer and remain firmly connected with this as parts of the wall element. The outer shell is advantageously held solely on the second geomembrane and its interface with the core concrete layer, in particular without the second geomembrane penetrating fasteners to the core concrete layer.

The cavity in which the core-concrete layer of the wall element is produced can, in an advantageous embodiment, be bounded at the bottom by a closure plate which remains at the lower edge of the inner shell of the wall element. Parts of the connecting devices between wall arrangement and bottom plate can pass through the end plate and are surrounded by the fresh concrete for the core concrete layer and firmly enclosed. The lower end plate may be in an advantageous embodiment, for example, a fiber cement board.

In a further advantageous embodiment, the cavity for producing the core-concrete layer can be bounded laterally by further formwork elements remaining in the wall element. These can advantageously be fastened to the outer shell or the second sealing web, in particular glued over the sealing material. Advantageously, these further formwork elements may have a further sealing membrane facing the cavity for the core concrete layer and form a creep-water-tight interface with the fresh concrete hardening to the core concrete layer.

Preferably, the core concrete layer is not horizontally parallel to the wall surface out to the side edges of the inner wall panel and outer shell and so recessed at the side edges of the precast wall elements a space between the inner wall panel and outer shell. In the wall assembly then creates a gap at the butt joint between adjacent wall elements, which is filled on the construction site with fresh concrete. Advantageously, reinforcing elements of the wall reinforcement project into the free space, wherein preferably such reinforcing elements are already prepared connected to the inner wall panel. By further, inserted into the space between adjacent wall elements reinforcing elements an overlapping circumferential reinforcement can be achieved. The reinforcement elements in the free space can also be omitted if the stability of the composite wall arrangement is ensured in a different way.

In another preferred embodiment, the inner shell of the wall elements may consist of a uniform, cast in one piece concrete layer. Advantageously, in this case, the provided with the second sealing sheet outer shell serves as a floor in a horizontal formwork form for the wall element and white filled with a sealing material of reinforcing elements fresh concrete to form the inner shell of the wall elements is filled. The fresh concrete again forms the creep-water-tight interface with the second geomembrane during curing. Lower end plate and / or lateral formwork elements may be provided as in the two-shell inner shell, or preferably omitted .............................. Free space at the joints between adjacent wall elements is advantageously given by the fact that at least one side edge of a step is formed.

The second geomembrane of the outer shell is also in the region of the free space on the side edge of the wall element and there again forms a creeper-water-tight interface with the fresh concrete poured on the construction site. At the butt joint between adjacent wall elements, the second geomembrane can be bridged by strip elements in the manner of the geomembranes. Also on the butt joints of the first and the second geomembrane in the region of the wall-sole connection such strip elements may be provided in the manner of the geomembranes.

The sealing material of the first and second sealing sheet and possibly other surfaces may advantageously be protected by a peelable film, which remains on the sealing material to protect the sealing material from contamination until the respective surface portions are processed.

The geomembranes can also by directly on a support surface of the outer shell, z. B. applied to a foam glass insulating material applied sealing material. Preferably, however, geomembranes on preferably flexible carrier film, for example made of PVC.

The structural part is in particular a sealed basement trough, but in another embodiment may also form part of a ceiling construction, in particular a flat roof construction, in which case preferably the first geomembrane extends over a load-bearing ceiling construction and prevents the penetration of water from top to bottom. The creep-water-tight interface along the first geomembrane opposite the overlying bottom plate prevents the horizontal spreading of water and the emergence of water accumulation between the first geomembrane and bottom plate.

The building part can advantageously be supported on a foundation, which z. B. may be executed as a point foundation under the joints of adjoining wall elements or preferably as a strip foundation under the wall assembly. In a particularly advantageous embodiment, under the entire base plate and the wall elements substantially continuous and the wall elements laterally projecting foundation plate is provided. The foundation plate is concreted in a preferred embodiment and connected at its bottom plate facing top with the bottom plate down bounding the first sealing membrane applied on the underside of the first sealing membrane sealing material, in turn, the concrete of the foundation plate with the bottom of the first sealing membrane forms a creeping water-tight interface , This is preferably achieved by covering the baseplate cast on site with the first geomembrane when the concrete is not yet cured that the concrete of the foundation plate cures with applied first sealing sheet and forms the creep-water-tight boundary layer.

In a preferred embodiment, the foundation plate may contain reinforcing elements and substantially the static stability of the bottom of the building part in a smaller thickness and possibly can be performed without their own reinforcement. It is essential that the first geomembrane forms a creep-water-tight interface both towards the bottom plate and towards the base plate. The creep-water-tight property of the interfaces should be given substantially flat throughout, with individual smaller isolated island surfaces with less or no creeping water tightness are still unproblematic. The arrangement is thus also fault-tolerant in the production.

Fig. 1

eine Schrägansicht einer teilweise aufgeschnittenen Kellerwanne,

Fig. 2

ein Anschlussbereich zwischen der Wandanordnung und der Bodenplatte,

Fig. 3

eine Stoßfugenanordnung entlang einer Wandseite,

Fig. 4

eine Stoßfugenanordnung an einer Wandecke,

Fig. 5

eine Variante einer Stoßfugenanordnung entlang einer Wandseite,

Fig. 6

eine Variante zu Fig. 2 in bevorzugter Ausführung,

Fig. 7

eine Zwischenwand zur Ausführung nach Fig. 6,

Fig. 8

eine weitere Variante zu Fig. 2,

Fig. 9

eine weitere Variante zu Fig. 2.

The invention is illustrated below with reference to preferred embodiments with reference to the figures still in detail. Showing:

Fig. 1

an oblique view of a partially cut cellar tub,

Fig. 2

a connection area between the wall assembly and the bottom plate,

Fig. 3

a butt joint arrangement along a wall side,

Fig. 4

a butt joint arrangement on a wall corner,

Fig. 5

a variant of a butt joint arrangement along a Wall side,

Fig. 6

a variant of FIG. 2 in a preferred embodiment,

Fig. 7

an intermediate wall for the embodiment according to FIG. 6,

Fig. 8

a further variant of FIG. 2,

Fig. 9

a further variant of FIG. 2.

A basement trough as a building part according to the present invention is shown in Fig. 1 in an oblique view from above with a view into the interior surrounded by a plurality of wall elements, wherein the basement trough is drawn cut on the viewer side facing.

The basement sump consists in particular of a base plate BP and a plurality of prefabricated wall elements WE, which project upright along the edge of the base plate and form a circumferential wall arrangement. The wall elements connect to corner joints FE or longitudinal joints FL together. The bottom plate BP is shown in transparent to represent individual foundations (point foundations) EF and support elements SE, by means of which the wall assembly is supported when setting up on the foundations, more clearly.

Within the area surrounded by the wall elements WE interior is still indicated by dotted line an inner wall ZW, which are supported on their own individual foundations and thus can act as a structural component for a further floor structure.

For the construction of the building part, the wall elements WE are independent of the site, z. B. made to measure in a concrete plant and delivered as a single wall elements to the site. On the construction site, the substrate UG for the basement bath is prepared by creating the individual foundations EF in the chosen example and leveling the substrate for the floor slab. The substrate can be further pre-processed in a conventional manner in different ways, for example by applying a cleanliness layer, which may be designed in particular as a lean concrete layer. The substrate can also be given by a layer of insulating material, such as rigid plastic foam or foam glass. If the thermal insulation also extend over the foundations, a sufficiently pressure-resistant material for the thermal insulation, for example, to choose foam glass. A first sealing membrane DB1 is placed above the prepared base for the base plate, including the area above the foundations. This can consist of several partial webs, which overlap at the butt welds or are bridged by sealing strips or the like. The geomembrane DB1 can also be prepared for the subsurface forming insulation boards. The geomembrane has upwardly, ie to the side on which the fresh concrete for the bottom plate is applied, a layer of a sealing material, which preferably has a tough sticky consistency and in particular bitumen and / or resin may contain as an essential ingredient and in contact with hardening fresh concrete forms with this a creep-water-tight interface. The sealant has in this case with the formation of Kriechwasserdichten interface during the curing of fresh concrete completely different properties than the construction sector also frequently used bitumen board, the interface remains to curing concrete largely water. The sealant of the geomembrane DB1 can still be covered at this stage with a peelable protective film, for example made of polyethylene. Before the Setting up the wall elements over the foundations, the protective film on the sealing compound of the sealing membrane DB1 is advantageously removed at least in the area of the support.

The wall elements consist in the preferred example outlined of a concrete inner shell and a preferably made of concrete different material outer shell and a lying between the inner shell and outer shell second sealing membrane DB1, which in turn facing the concrete of the inner shell has a sealant which during curing of the concrete Inner shell with this a creep-water-tight interface has formed. The outer shell is preferably formed by a dimensionally stable plate DP of heat-insulating material

The wall elements have on the lower edge of the inner shell downwardly projecting support elements SE, by means of which the wall elements are supported on the foundations EF on the geomembrane DB1. In this case, as far as necessary, small height differences of the foundations at the individual support points can be compensated, for example, by placing spacer elements and / or by adjustability of the support elements. The support elements may also contain adjustable screw elements. The support elements may consist of first partial elements on the side of the wall elements and second partial elements on the sides of the first sealing membrane. The wall elements are aligned relative to each other and fixed in this position by braces, supports or other aids.

The geomembrane DB1 extends laterally as far as at least below the inner shell of the wall elements, preferably also as far as below the outer shell of the wall elements, and may also project beyond them. The second sealing membrane of the wall elements extends deeper than the lower edge of the wall elements. Preferably The outer shell of the wall elements also extends in one piece continuously deeper than the lower edge of the inner shell of the wall elements and advantageously up to approximately to the lower edge of the support elements SE. In this case, the second sealing web is advantageously firmly connected to the outer shell in the region projecting downwards beyond the lower edge of the inner shell of the wall elements. The second sealing web DB2 can advantageously extend at least as far as the lower edge of the outer shell of the wall elements or also protrude further down over the latter. The second geomembrane thus extends substantially in the vertical direction up to the first geomembrane and connects to this or can overlap with this. When overlapping guide arises, preferably with slight pressure of the geomembrane in the overlap region to each other, a continuous closed geomembrane. In the case of only the second sealing sheet extending up to the first sealing sheet, the angle can preferably be bridged by a strip of sheet which in turn is coated with the sealing material. Bridges are also provided in the area of the wall joints of adjoining wall elements. A protective film which is advantageously present at the protective regions of the second sealing web projecting downwards over the lower edge of the inner shell is pulled off, so that in the overlapping region a closed area provided with sealing material of the first sealing web DB1 facing the concrete base plate BP, second geomembrane DB2 and possibly additional bridging strips. Additional sealing measures along the vertical wall joints of adjacent wall elements while bridging an optionally existing gap between the second sealing webs of adjacent wall elements is described in detail with reference to FIGS. 3 and 4 by way of an advantageous example. The web strip for bridging the angle between the second geomembrane on the outer shell of a wall element and the first geomembrane may advantageously be formed by an angle profile, which preferably at an initial angle of less than 90 ° along the lower edge of the outer shell attached to the inwardly facing surface of the second sealing sheet and after placing the wall element on the foundation or the first sealing sheet in this out bent over and glued to their sealant. The web strips can z. B. from coated with sealing material aluminum foil, z. B. 0.15 mm thick, exist.

After at least largely sealing the formwork space for the concrete floor slab and the complete removal of any protective film on this formwork space assigning sealing material of the geomembranes DB1 and DB2 fresh concrete is filled for the bottom plate, where necessary in a previous step even reinforcement structures in the formwork space the concrete slab may have been introduced. The fresh concrete also flows under the lower edge of the inner shell of the wall elements, wherein the inner shell downwardly projecting outer shell with the sealing membrane DB2 advantageously also forms an edge formwork for the bottom plate. The fresh concrete comes into direct contact with the sealing material of the geomembranes DB1 and DB2 and forms with them during curing the already mentioned creep-water-tight boundary layer. The fresh concrete for the bottom plate also flows around the support elements SE below the inner shell of the wall elements. The support elements remain in the concrete of the floor slab and may form part of the mechanical anchoring of wall elements and floor slab. The fresh concrete for the bottom plate is advantageously introduced up to a level OB above the lower edge of the inner shells of the wall elements, so that the resulting transition stage ST (FIG. 2) additionally effects a mechanical support of the wall elements against externally pressing water and soil. The height of the step is advantageously in a range between 1.5 cm and 4.5 cm. Between the fresh concrete of the concrete floor slab and the lower edges of the inner shells of the wall elements no Kriechwasserdichte interface. Already after a first solidification phase of the fresh concrete of the bottom plate can be started with the further processing of the wall structure by topping from there still existing in the region of joints between adjacent wall elements cavities. The entire manufacturing process for the basement bath is thus on the site with little effort, in a short time and without particularly carefulness critical process steps executable, which contributes to reducing the construction time and costs. Without additional effort while a basement bath is achieved with thermally insulated wall assembly.

A particularly advantageous construction of prefabricated wall elements as well as a preferred production process for such wall elements will be described with reference to FIGS. The wall elements consist, as already described with reference to FIG. 1, of an outer shell AS, an inner shell IS and a second sealing web DB2 between the outer shell and the inner shell, which is fastened on the outer shell, preferably glued, and on the other hand via a sealing material of the type described with the concrete the inner shell IS forms a creep-water-tight surface connection. The outer shell is advantageously made of a thermally insulating material, for example of a polymer foam, in particular foamed polystyrene, or of foam glass. The outer shell advantageously forms a dimensionally stable plate and, as such, can advantageously be handled independently in the production of the wall element. To secure the sealing web DB2 on the inner shell facing side of the outer shell, the sealing web DB2 and / or the surface of the outer shell may be provided with an adhesive. In particular, the geomembrane DB2 can also be more tacky on the outer shell-facing side with sealing material Be consistent. The inner shell is in the sketched embodiment advantageously in clamshell with a subsequent to the geomembrane DB2 core concrete layer and an inner wall panel, wherein the core concrete layer is connected to the geomembrane DB2 via a Kriechwasserdichte interface of the type already described several times and with the inner wall panel via a common reinforcing grid BW ,

For the production of the sketched advantageous prefabricated wall element, the outer shell with the sealing web DB2 fastened thereto is prepared in an advantageous embodiment as a first formwork element delimiting the mold for the core concrete layer. As another, the opposite side of the mold for the core concrete layer KB limiting shuttering element, the inner plate made of concrete with partially cast in reinforcement grid BW as semi-finished part. Such semi-finished parts are in common use and referred to as lattice girders or filigree plates. The outer shell AS and the inner wall plate IP are positioned opposite one another in a defined mutual orientation and the cavity formed between them, which is still delimited downwards and to the side, serves as a casting mold for the core-concrete layer KB. By filling fresh concrete in this mold and curing the fresh concrete is on the one hand, a strong mechanical connection between the inner wall panel IP and core concrete layer on the common reinforcing grid and on the other a creep-water interface, which also represents a strong mechanical connection, between the cured core concrete layer and the geomembrane DB2 produced. This creates a multi-shell wall element with intimate connection of the individual shells.

In the relative orientation of the outer shell with the geomembrane DB2 on the one hand and the inner wall panel on the other hand as formwork elements of Mold for the core concrete layer KB, the lower edge of the inner wall panel is set higher than the lower edge of the outer shell AS and the cavity for the core concrete layer is limited downwards at least approximately at the level of the lower edge of the inner wall panel. For the lower boundary of the cavity can be seen from Fig. 2 lower end plate AP limit the cavity of the mold for the core concrete layer down. By this end plate, which may advantageously consist of a fiber cement material, connecting elements VE of a connecting device between wall element and bottom plate can be conveniently passed through which are firmly anchored after solidification of the core concrete layer in this. Below the lower edge of the inner shell IS of the wall element formed in the preferred example outlined by the end plate AP, the support elements SE for supporting the prefabricated wall elements can be mounted on the foundations, as sketched in FIG. Such support elements can be connected to the inner shell of the wall element either alone or via the connecting elements VE during casting of the core concrete layer or, especially when forming connecting elements VE with over the end plate AP downwardly projecting threaded portions, subsequently attached to the precast wall element before this is placed on the foundations. Preferably, the attachment of the support elements already takes place at the manufacturer of the precast wall elements, whereby the lower edge of the outer shell can be conveniently set at least approximately the same height as the lower edge of the support elements SE. The end plate AP can already be connected in the production of the inner wall panel IP with this or only be recognized in the construction of the mold for the core concrete layer of this. When using such preferred wall elements with lower end plate is in the production of the basement as a structural part advantageously the level ST of the bottom plate BP in the region of the lower edge of the inner shell of the wall elements selected higher than the thickness of the end plate, so that the support of the wall elements against earth pressure at the stage also acts on the inner wall panel IP.

In another, unspecified embodiment, only the second sealing sheet without the outer shell can be used in conjunction with a reusable formwork panel instead of the outer shell and an outer shell subsequently mounted on the second sealing sheet in the production of the core concrete layer.

In a particularly advantageous embodiment, the core concrete layer in the horizontal direction parallel to the wall surface does not extend to the side edges of the inner wall panel IP and the outer shell AS, but is offset by against this lateral outer edges to the center of the wall element out offset further formwork elements from the edge of the wall elements, advantageously at least one, preferably both opposite ends of the wall elements remain free spaces between the inner wall panel and outer shell (Fig. 3, Fig. 4). The additional formwork elements for the lateral boundary of the core concrete layer remain in the embodiment sketched in the prefabricated wall element. The additional formwork elements can be designed in an advantageous embodiment as in the vertical direction elongated prismatic body with parallel contact surfaces for the second geomembrane and the inner wall panel. Advantageously, the surfaces of these additional formwork elements may in turn be coated with the sealing material. The additional formwork elements can be adhered to the second sealing web DB2 the outer shell in an advantageous manner, so that the resulting multi-part module limits the cavity of the mold for the core concrete layer on three sides. The additional formwork elements can at the same time as spacers between Outer shell and inner wall plate serve. The additional formwork elements are in a preferred embodiment made of hard foam, optionally with a sealing material-containing layer or web.

In the remaining at the opposite ends of the wall element clearances can advantageously protrude reinforcing elements BF, which are advantageously connected to the reinforcement grid BW and with respect to the additional formwork elements PS within the inner wall panel IP guided past them.

The left at the ends of the wall elements spaces form when joining wall elements in a straight butt joint according to Fig. 3 or a corner-butt joint according to Fig. 4 spaces ZL and ZE, in which, if necessary, not shown further reinforcing elements can be used, which then the reinforcement extensions BF overlap and lead to a continuous continuous reinforcement.

In the gaps ZF remaining joints between the second sealing webs DB2 adjoining wall elements advantageously bridged by strip-shaped sealing membranes DL in Fig. 3 and DE in Fig. 4, said strip-shaped sealing sheets turn the cavities zuweisend a sealing material to form a creep water-resistant interface to a Having in the spaces ZL and ZF filled there curing fresh concrete.

The sealing webs DB2 on the outer shells AS of the wall elements can be present in the butt joint area only on the surface of the outer shell facing the inner wall panel or can also be continued into the cut edge of the wall elements. In particular, in the latter case, the Density strips DL and DE also omitted if the remaining gaps between the opposite edges of the outer shells are very narrow or can be completely closed by pressing together the present at these cutting edges sealing membrane sections. The introduction of the strip-shaped further sealing webs DL or DE in the interstices in erected wall elements can be done for example from above with rigid tools, such as profiles or the like, with little effort. The further geomembranes may in particular consist of aluminum foil coated with sealing material.

At the transition of the second sealing web DB2 to the first sealing web at the lower edge of the outer shell AS, the second sealing web can be guided to the lower edge of the outer shell. Advantageously, in turn, an angle bridging sealing strip DS is inserted. In another embodiment, the second geomembrane may be extended beyond the lower edge of the outer shell and, as sketched in FIG. 2, overlap the first geomembrane to the casting space for the bottom plate. In yet another embodiment, the second geomembrane at the lower edge of the outer shell AS along the downwardly facing surface may be parallel to the first geomembrane led to the outside and here preferably glued to the first geomembrane. The individual measures can also occur in combination.

In Fig. 5, a butt joint is sketched along the side edges of two wall elements. As described with reference to FIG. 3, the joint in the outer shell is bridged by a sealing strip on the inside of the second sealing web from the clearance ZL. The free space is formed by recesses of the side edges of the wall elements on one of the inside of the room facing inner wall surface facing away from the inner shell.

The wall element is shown in a preferred embodiment with single-shell concrete inner shell WB with reinforcement BW. The clearance ZL is here formed by the fact that the side edge of the inner shell spaced from the inner wall surface to the second sealing web DB2 down a return to z. B. a level IST shows.

Fig. 6 shows a particularly advantageous development in which instead of individual foundations under the bottom plate BPL and the wall elements continuous and laterally beyond the wall elements beyond projecting foundation plate FUP is provided. The foundation plate is poured on site from concrete, below the foundation plate in a known manner a cleanliness SS, z. B. may be provided from lean concrete. The foundation plate may contain reinforcing elements BEF.

In a particularly advantageous embodiment, the first sealing membrane DB1 D is also provided on its side facing the foundation plate with sealing material of the type mentioned and is in direct contact with the concrete of the foundation plate and forms with this again a creeping water-tight interface. For this purpose, after casting the concrete of the foundation plate, the first sealing membrane with the underside coated with sealing material is advantageously placed on the moist fresh concrete of the foundation plate so that the creep-water-tight interface to the first sealing membrane is formed when the concrete of the foundation plate hardens. The upwardly facing side of the first geomembrane, which is likewise coated with sealing material, can advantageously still be covered with a protective film.

The foundation plate with reinforcements can advantageously in their structure, in particular in terms of thickness DF, z. B. 25 cm and reinforcement, so designed be that they at least predominantly meets the static requirements for the floor of the building part, so that the cast on the upper side of the first geomembrane after curing the foundation plate and setting up the wall elements base plate BPL in their dimensions with or without reinforcement no longer than primary static Component designed and in particular in a smaller thickness DL than in the example of FIG. 2, z. B. only about 8 cm can be performed. Essential here is the formation of a creeping water-tight interface of the first geomembrane to the concrete foundation plate.

Fig. 7 shows the embodiment of Fig. 6 with the bottom plate BTL continuous foundation plate FUP a support of an intermediate wall within the space enclosed by the wall assembly interior. The intermediate wall ZW is supported in a manner corresponding to the wall elements via a spacer SE on the geomembrane DB1D. Additional sealing measures are not required at this point, since the geomembrane DB1 D is formed horizontally throughout and at the junction of the intermediate wall no penetration of water from the outside exists. The lower edge of the intermediate wall is advantageously lower again than the upper surface of the bottom plate BPL, so that the intermediate wall is automatically supported horizontally on the step of the bottom plate BPL.

FIG. 8 shows a further variant of the wall-floor joint according to FIG. 2 or FIG. 6. In the embodiment according to FIG. 8, the foundation plate FUP below the wall elements has a region FPH with a greater height DFH, which is particularly at high Wall load can be beneficial.

In the embodiment sketched in Fig. 9, which corresponds with respect to the wall elements, the bottom plate and the foundation plate of Fig. 6, the Foundation plate FUP on a heat-insulating layer FIL, such as foam or rigid foam, applied and further heat insulation elements FIS form a complete heat insulation jacket around the foundation plate FUP up to the heat-insulating outer shell AS of the wall elements.

The features indicated above and in the claims, as well as the features which can be seen in the figures, can be implemented advantageously both individually and in various combinations. The invention is not limited to the exemplary embodiments described, but can be modified in many ways within the scope of expert knowledge. In particular, layers or webs with sealing material can be provided on further surfaces.

Claims (53)

Concrete structural part with a concrete base plate and a wall along its edge upwardly projecting, an interior multi-sided surrounding wall assembly and with sealing devices using at least one planar geomembrane, which forms a creep-water-tight interface with a concrete layer of the wall assembly and / or the bottom plate, characterized in that a first geomembrane runs on the underside of the bottom plate and forms with the bottom plate a first creep-water-tight interface, that a second geomembrane extends in the wall arrangement between a concrete layer of an inner shell and an outer shell and forms a second creep-water-tight interface with the concrete layer of the wall structure, and connect first and second sealing web in the region of the lower edge substantially to each other or overlap. Building part according to claim 1, characterized in that the outer shell of the wall assembly with the second geomembrane extends deeper than the inner shell and that the bottom plate extends laterally under the inner shell to the second geomembrane and forms with this another creep water-tight interface. Building part according to claim 1 or 2, characterized in that vertical support elements extend from the first sealing sheet to the lower edge of the inner shell and are enclosed by the concrete of the bottom plate. Building part according to one of claims 1 to 3, characterized in that the second sealing sheet is continued over the lower edge of the outer shell and horizontally overlapping over the first sealing sheet. Building part according to one of claims 1 to 4, characterized in that the outer shell consists of a heat-insulating material. Building part according to one of claims 1 to 5, characterized in that the outer shell consists of a rigid foam material. Building part according to one of claims 1 to 6, characterized in that the wall assembly is composed of a plurality of precast wall elements. Building part according to one of claims 1 to 7, characterized in that the inner shell comprises a sealing layer assigning the core concrete layer and an interior facing inner wall plate. Building part according to claim 8, characterized in that a wall reinforcement connects the core concrete layer and the inner wall panel. Building part according to one of claims 1 to 9, characterized in that the inner shell of the wall assembly is limited at its lower edge by a closure plate. Building part according to one of claims 1 to 10, characterized in that the wall structure and the base plate are connected by connecting devices. Building part according to one of claims 1 to 11, characterized in that the upper surface (OB) of the bottom plate is higher than the lower edge of the inner shell. Building part according to one of claims 7 to 12, characterized in that separation points of the second geomembrane are bridged at butt joints of adjacent wall elements by sealing strip elements. Building part according to one of claims 7 to 13, characterized in that in the precast wall elements, the inner wall shell does not reach continuously to the joints and the gaps formed thereby formed in the composite wall assembly are poured with concrete. Building part according to claim 14, characterized in that the wall reinforcement of the wall elements is continued in the intermediate spaces. Building part according to one of claims 1 to 15, characterized in that a reinforcement is provided in the bottom plate. Building part according to one of claims 1 to 16, characterized in that it forms a basement trough. Building part according to claim 17, characterized in that the first sealing sheet extends over a foundation and the wall assembly is supported above the foundation on the first sealing sheet. Building part according to claim 18, characterized in that the foundation is formed by a strip foundation or by point foundations. Building part according to one of claims 17 to 19, characterized in that a layer of heat-insulating material is provided below the first sealing web. Building part according to claim 17, characterized in that a below the bottom plate and the wall assembly is a concrete foundation plate. Building part according to claim 21, characterized in that the underside of the first sealing sheet with the concrete of the bottom plate forms a Kriechwasserdichte interface. Building part according to claim 21 or 22, characterized in that the bottom plate is statically weaker than the foundation plate. Building part according to one of claims 1 to 16, characterized in that the bottom plate is a flat roof plate. Building part according to claim 24, characterized in that under the first geomembrane a static load-bearing flat roof construction runs. A method for producing a basement sump as a concrete building part with a bottom plate on a first geomembrane and along the edge of the bottom plate upwardly projecting, an interior multi-sided surrounding wall assembly using multiple precast wall elements, each having an outer shell, a concrete inner shell and a between these inserted second geomembrane included, wherein the first and second sealing web with the bottom plate or the inner layer form a flat Kriechwasserdichte interface, with the method steps a) preparation of a support base (UG) for the base plate with a foundation (EF, FUP), b) producing the first geomembrane (DB1) over the support surface c) placing the prefabricated wall elements over the foundation, wherein the lower edges of the inner shell are spaced from the first sealing sheet and the second sealing sheet with the outer shell extends substantially to the first sealing sheet, d) introducing the fresh concrete for the floor slab on the first geomembrane, wherein the space is filled under the inner shell of the wall elements up to the second geomembrane and formed during curing of the fresh concrete creep water-tight interfaces to the first and the second geomembrane. A method according to claim 26, characterized in that individual foundations are produced as part of the supporting ground in the soil. The method of claim 26 or 27, characterized in that a cleanliness layer is produced as part of the support substrate. A method according to claim 26, characterized in that under the bottom plate (BPL) and the wall assembly lying concrete foundation plate is produced. A method according to claim 29, characterized in that the first geomembrane is placed with its underside provided with sealing material on the wet concrete of the foundation plate and forms a Kriechwasserdichte interface with the concrete of the foundation plate during curing. A method according to any one of claims 26 to 30, characterized in that at butt joints of adjacent wall elements, the second sealing sheets to be bridged by sealing strips. The method of claims 26 to 31, characterized in that free spaces between adjacent wall elements be filled with fresh concrete according to any one. Method according to one of claims 26 to 32, characterized in that the first and second sealing web are overlapped against each other. Prefabricated wall element with a concrete inner shell and an outer shell, in particular made of a different material from concrete, and a full-length between inner shell and outer shell geomembrane, which forms a Kriechwasserdichte interface with the concrete inner shell, wherein the geomembrane over the lower edge of the inner shell vertically continued down. Wall element according to claim 34, characterized in that the outer shell protrudes with the sealing sheet down over the lower edge of the inner shell. Wall element according to claim 32 or 33, characterized in that the inner shell contains a sealing layer facing the core concrete layer and a sealing web facing away from the inner wall plate. Wall element according to claim 36, characterized in that core concrete layer and inner wall plate are connected via a common reinforcing grid. Wall element according to one of claims 32 or 33, characterized in that the inner shell is designed with a single shell. Wall element according to one of claims 32 to 36, characterized in that the inner shell and the outer shell with the sealing web in the region of the butt joint of two wall elements define a free space. Wall element according to claim 39, characterized in that reinforcing elements project from the wall plate and / or the core concrete layer into the free space. Wall element according to claim 37 or 38, characterized in that the core concrete layer is limited to the free space by a remaining in the wall element formwork element. Wall element according to one of claims 33 to 40, characterized in that connecting elements project downwardly out of the inner shell. Wall element according to one of claims 33 to 41, characterized in that supporting elements are attached to the lower edge of the inner shell. Wall element according to claim 43, characterized in that the lower edge of the support elements is at least approximately at the same height with the lower edge of the protruding down over the inner shell outer shell. A method for producing a prefabricated wall element according to any one of claims 33 to 42, characterized in that a plate-shaped outer shell, in particular made of a different material from concrete with a sealing sheet is used as the outer formwork of a mold for the wall element and assigning the sealing sheet to the cavity of the mold a sealing material which forms a creep-water-tight interface with hardening fresh concrete, and that the cavity is filled with fresh concrete for an inner shell of the wall element and the outer shell remains on the wall element after curing of the core concrete layer. A method according to claim 45, characterized in that as the outer formwork facing inner formwork of the mold, a concrete wall plate with cast reinforcing grid, which projects into the cavity of the mold, is used and remains after curing of the core concrete layer on the wall element. A method according to claim 45 or 46, characterized in that spaced from the vertical edges of the outer shell and the wall plate additional side formwork elements are arranged, which the Define cavity of the mold laterally and remain in the wall element after curing of the core concrete layer. A method according to claim 47, characterized in that the side-formwork elements are glued to the sealing material of the geomembrane and / or on the wall plate. A method according to claim 48, characterized in that a rigid foam material is selected as the material for the side-formwork elements. Method according to one of claims 45 to 49, characterized in that the lower boundary of the cavity of the mold is vertically spaced from the lower edge of the outer shell. Method according to one of claims 45 to 50, characterized in that in the inner shell connecting elements are poured, which project beyond the lower edge of the inner shell of the wall element downwards. Method according to one of claims 45 to 51, characterized in that the cavity of the mold to the bottom of the wall element is limited by a horizontal end plate, which remains in the wall element. A method according to claim 51 and 52, characterized in that the connecting elements are guided through the end plate.

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