DE20309107U1 - Sealing element for the production of waterproof external walls in concrete double wall elements - Google Patents

Description

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Sealing element for the production of waterproof exterior walls

for concrete double wall elements

Technical area

The invention relates to a sealing element for the production of water-impermeable external walls of rooms set in water-bearing soil using concrete double-wall elements to be placed on a concrete floor slab. The invention further relates to a concrete double-wall element and a room set in water-bearing soil.
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State of the art

Buildings in the ground are exposed to moisture or water in various ways. In particular, they must be impermeable to ground moisture and to water under pressure and water without pressure.

Special requirements arise when precast concrete elements, such as concrete double wall elements, are used to construct the external walls. If several double wall elements are placed on a floor slab, joints arise at the connection points that must be suitably sealed.

In a sealing process known as the "black tank", the entire outer surface of a room set in water-bearing soil is sealed. To do this, the building is covered with plastic sealing sheets on its base and on its side walls.

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and thus packed in a watertight manner. The plastic sheets must be carefully laid and welded at the joints between the prefabricated parts to prevent water from penetrating. This process is time-consuming and labor-intensive and also very expensive due to the high material consumption. 5

Another known solution is to erect an inner and outer formwork wall on the finished floor slab for the construction of the outer walls, into which concrete is poured. However, this method requires, in addition to the formwork effort, a large amount of reinforcing material in order to minimize the shrinkage that occurs when the concrete sets.

Description of the invention

This is where the invention comes in. The invention, as characterized in the claims, is based on the task of avoiding the disadvantages of the prior art and, in particular, of enabling simple and cost-effective sealing of the external walls of rooms set in water-bearing soil.

This object is achieved according to the invention by the sealing element according to claim 1 and claim 11, the concrete double wall element according to claim 16, and the space embedded in water-bearing soil according to claim 17.

According to the invention, a generic sealing element has a support for integration into the concrete floor slab and an elongated flat joint element held in a vertical orientation by the support, which seals the wall-floor joint after the erection and pouring of a double wall element.

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The support beam fixes and stabilizes the position of the joint element. In particular, tipping or other changes in position of the joint element are avoided during the pouring of the double wall element with in-situ concrete. The sealing element according to the invention can therefore ensure controlled and reliable sealing of the wall-floor joint.

In the context of this invention, "double wall element" is understood to mean a precast concrete part consisting of two reinforced concrete shells connected to one another by lattice girders. After assembly, the double wall elements are cast with in-situ concrete, with the elements themselves serving as formwork. Other terms are also common for double wall elements, such as hollow wall, triple wall, element wall, prefabricated wall, double-shell wall, partially prefabricated wall or double-shell partially prefabricated wall. The term "double wall element" hereinafter includes all such elements.

According to a preferred embodiment of the invention, the support beam comprises a plurality of reinforcing steel brackets that are rigidly connected to one another along the longitudinal direction of the joint element. In particular, the reinforcing steel brackets can be welded to a longitudinal bar made of reinforcing steel. This results in a sealing element that is both light and stable and easy to handle on a construction site.

A particularly simple and cost-effective production can be achieved by making the reinforcing steel stirrups in one piece. According to an advantageous development of the invention, the reinforcing steel stirrups have a horizontal standing area and two essentially vertical support areas, at which they are connected, in particular welded, to the joint element.
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The support beam is preferably designed and configured to be placed on a reinforcement layer of the concrete floor slab and to be fully integrated into the floor slab.

In an advantageous embodiment, the joint element is formed by a flat joint plate with a substantially rectangular circumference. A sealing element designed in this way is particularly suitable for sealing the joint between a straight wall and a floor slab. In order to seal the wall-floor joint in the area of a corner joint, a joint element is used according to the invention which is formed by a bent joint plate with a substantially rectangular circumference. In particular, the joint plate can have two closely spaced bends of approximately 135° each in order to seal the wall-floor joint in the area of a 90° corner joint. For other corner angles, other bend angles can of course also be considered. The corner angle can also be bridged with just one bend or with more than two bends instead of two closely spaced bends.

The joint sheet is preferably arranged in the support beam in such a way that, after the support beam is integrated into the floor slab, it is integrated into the floor slab with a lower vertical section, and that an upper vertical section protrudes vertically from the floor slab to seal the wall-floor joint. The lower and upper vertical sections are expediently the same size, so that just half of the joint sheet is integrated into the concrete floor slab.

The invention contains a further sealing element for sealing the wall-to-wall joints between adjacent double wall elements with lattice girders. This sealing element for wall-to-wall joints comprises, according to the invention,

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- an elongated flat joint element that seals the wall-to-wall joint after the installation and pouring of adjacent double-wall elements,

- a predetermined cracking element attached to the joint element and extending along the longitudinal direction and perpendicular to the surface of the joint element, and

- two guide rails for vertical fastening to the lattice girders of the adjacent double wall elements, which are designed and configured to accommodate opposite longitudinal edges of the joint element when erecting the double wall elements.

The position of the joint element is fixed by the guide rails when the double-wall elements are poured. It goes without saying that the distance between the two guide rails and the width of the joint element are coordinated to ensure a secure hold.

The crack-preventing element is advantageously designed in such a way that it does not bond with the in-situ concrete. In particular, the crack-preventing element can be provided with a plastic coating and is formed, for example, by a mesh mat with a shrink-fitted polyethylene film. Due to the local weakening of the concrete cross-section, the crack-preventing element means that the shrinkage cracks that form in the concrete occur in a controlled manner at the location of the crack-preventing element, where they are protected against both pressing and non-pressing water by the joint sheet.

For sealing the butt joints between straight walls, the joint element of the sealing element is suitably formed by a flat joint plate with an essentially rectangular circumference.

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To seal corner joints, the joint element is advantageously formed by a bent joint sheet with a substantially rectangular perimeter. In particular, to seal a 90° corner joint, the joint sheet can have two bends close to each other, each of about 135°, with the predetermined crack element possibly being arranged between the two bends. As with the first sealing element, other bend angles or a design with a different number of bends can also be considered here.

The invention further includes a concrete double wall element with two concrete shells connected by lattice girders, in which the lattice girder is provided on opposite sides with a vertical guide rail in order to accommodate the joint element of a sealing element for sealing wall-wall butt joints of the type described.

The invention further comprises a room set in water-bearing soil with a concrete floor slab and concrete double wall elements placed on the floor slab and filled with in-situ concrete. A plurality of the first sealing elements described above are incorporated into the floor slab to seal the wall-floor joint. The joint elements of the first sealing elements overlap one another at the joint and are welded together in this overlapping area. This allows a reliable all-round seal of the wall-floor joint to be created.

Particularly preferably, the wall-wall joints of adjacent double wall elements are sealed with the second sealing elements described above for sealing wall-wall butt joints. The joint elements of the second sealing elements overlap the joint elements of the first sealing elements on their underside and are welded to them in the overlap area. In the room created in this way, all joints between the precast concrete elements or between the precast elements and the floor

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plate is optimally sealed against both pressing and non-pressing water.

In a method for producing water-impermeable external walls of rooms set in water-bearing soil, which method itself is not part of the invention, the following steps are carried out:

- placing a plurality of the first sealing elements described above for sealing a wall-floor joint on a reinforcement layer of a concrete floor slab so that the joint elements overlap each other at the joint,

- Concreting the floor slab to integrate the support beam and a lower vertical section of the joint elements into the floor slab,

- Installation of double wall elements centrally above the upper vertical section of the joint elements, and

- Pouring the double wall elements with in-situ concrete.

The joint elements are preferably welded together in the overlap area. It is also advisable to weld or tie the support beams of the first sealing elements to the reinforcement layer after they have been placed on it.

The double wall elements are preferably provided with a vertical guide rail on opposite sides before they are set up. This is preferably done by the manufacturer of the double wall elements so that they are delivered to the construction site with integrated guide rails. Alternatively, the guide rails are only attached to the lattice girders of the double wall elements on site, in particular welded. According to another alternative, the guide rails are welded to the lattice girders of the double wall elements by the manufacturer of the sealing elements.

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and the lattice girders are delivered to the precast plant together with the welded-on guide rails. This allows the manufacturer of the sealing elements to ensure that the distance between the guide rails corresponds to the width of the joint element to be inserted later.

After a double wall element has been set up, a second sealing element of the type described above is inserted into an exposed guide rail of the double wall element to seal the wall-to-wall joint, so that the joint element of the second sealing element overlaps the joint element of a first sealing element on its underside. It is then welded to the first sealing element in the overlap area.

Then another double wall element can be set up, the guide rail of which takes up the still free long edge of the joint element. The joint element is then secured in its position by support at three points when the double wall elements are later poured. In addition to being welded in the overlap area with the joint element of the first sealing element, it is held in its vertical alignment at its long edges by the guide rails of the two adjacent double wall elements.

When inserting the last double wall element of an external wall, it can be inserted into the gap from above using a crane or similar device and held in a vertical position above the overlap area of the joint elements of the first and second sealing elements. After the joint elements have been welded, the double wall element is lowered onto the floor slab.

The invention will be explained in more detail below using exemplary embodiments in conjunction with the drawings. Only the elements essential for understanding the invention are shown. It shows

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Fig. 1 a schematic cross-sectional view of a wall-floor joint

between a base plate and a double wall element with a first sealing element according to an embodiment of the invention;

Fig. 2 is a side view of the sealing element of Fig. 1;

Fig. 3 is a plan view of the sealing element of Figs. 1 and 2;

Fig. 4 is a plan view of a modification of the sealing element of Figures 2

and 3 for sealing the wall-floor joint in the area of a 90° corner joint;

Fig. 5 in (b) a plan view of a wall-wall joint between adjacent

adjacent double wall elements with a second sealing element according to an embodiment of the invention, wherein in (a) the right double wall element and the sealing element are shown before insertion into the guide rail;

Fig. 6 is a perspective view of the sealing element and one of the

the guide rails attached to the double wall elements of Fig. 5; and

Fig. 7 is a plan view of a modification of the sealing element of Figures 5

and 6 for sealing the wall-wall joint in the area of a 90° corner joint.

Ways to implement the invention

Figure 1 shows a schematic cross-sectional view of a wall-floor joint between a floor slab 10 and a double wall element 16 with

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a sealing element 20 according to an embodiment of the invention. Figures 2 and 3 show a non-installed sealing element 20 additionally in side view and in plan view.

The sealing element 20 of the exemplary embodiment has a 2 mm thick and 250 mm wide joint plate 24, which is held in a vertical alignment by a support beam 22, 26. For this purpose, the support beam contains a plurality of similar reinforcing steel brackets 22, which are rigidly connected to one another along the longitudinal direction of the joint plate 24 via two spaced-apart reinforcing steel longitudinal rods 26 in the base area. In the exemplary embodiment, the reinforcing steel brackets 22 are welded to the longitudinal rods 26 at the contact points. While four brackets 22 are shown in Fig. 2 and 3, it is understood that a smaller or larger number of brackets 22 can also be used depending on the dimensions of the joint plate 24 and the required stability.

As can best be seen in Fig. 1, the reinforcing steel stirrups 22 are designed in one piece and, in addition to a horizontal standing area 30, have two essentially vertical support areas 32 at which they are welded to the joint plate 24 (reference number 28).

To produce a watertight outer wall, a plurality of sealing elements 20 are placed on a lower reinforcement layer 14 of the floor slab 10 before the floor slab is concreted. In the exemplary embodiment, the sealing elements 20 are welded with their two longitudinal bars 26 to the lower reinforcement layer 14 and in the area of the reinforcing steel brackets 22 to an upper reinforcement layer 12 of the floor slab 10.

An angled sealing element 40 is used for the corners of the building, as shown in Fig. 4 in plan view. The joint plate 44 and the longitudinal bars 46 of the sealing element 40 have two bends 45 and 47 that are close to each other, each forming an angle φ of 135°. It

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It is understood that other bend angles φ can also be selected for other corner angles to be achieved. The corner angle can also be bridged with just one bend. However, in particular in connection with the sealing element for wall-to-wall corner joints described below, the design with two bends is preferred. Just as with the sealing element described in connection with Figures 1 to 3, the joint plate 44 is held in its vertical alignment by a plurality of reinforcing steel brackets 42 welded to it.

After all sealing elements 20 and 40 have been set up, the floor slab is concreted in order to incorporate the support beams and a lower vertical section 34 of the joint plates 24, 44 into the floor slab 10. The upper vertical section 36 protrudes vertically from the floor slab 10 in a secure and stable position and is available for sealing the wall-floor joint. The lower and upper sections 34 and 36 are the same size in the example and each take up half the width of the joint plate.

Adjacent sealing elements 20 or 40 are integrated into the floor slab at such a distance that their joint plates 24 and 24 or 24 and 44 overlap each other and can be welded together in the overlapping area.

After all sealing elements 20, 40 have been integrated and welded, double wall elements 16 are placed centrally above the protruding upper portion 36 of the joint sheets 24, 44.

To seal the wall-to-wall joints between the adjacent double-wall elements, two further types of sealing elements are provided, which will now be described with reference to Figures 5 to 7.

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Figure 5(a) shows a plan view of a double wall element 50 with an inner shell 52 and an outer shell 54. The two concrete shells 52 and 54 are connected to one another by a lattice girder 56, of which only the outer edge region is shown in the figure. A vertical guide rail 66 is welded to the lattice girder 56 and extends essentially over the entire height of the double wall element 50.

Fig. 5(a) also shows a joint plate 62 extending in the vertical direction, on whose two main surfaces a predetermined cracking element 64 is attached. The joint plate 62, the predetermined cracking elements 64 and the guide rails 66 together form a sealing element 60.

After the double wall element 50 has been erected, the joint plate 62 of the sealing element 60 is inserted with a longitudinal edge into the exposed guide rail 66 in such a way that it overlaps the joint plate of a sealing element 20 or 40 on its underside and can then be welded to it in the overlap area.

After welding, another double wall element 50 is set up, the guide rail 66 of which accommodates the opposite longitudinal edge of the joint plate 62. This situation is shown in Fig. 5(b). The joint plate 62 is now fixed in its position at three points, which ensures a secure hold when pouring the double wall elements with in-situ concrete.

The joint sheet 62 with the predetermined crack element 64 is shown again in perspective view in Fig. 6 together with one of the two guide rails 66. As can be clearly seen in Fig. 6, the predetermined crack element 64 extends along the vertical longitudinal direction and perpendicular to the surface of the joint sheet 62. It is coated with a material that does not bond to the in-situ concrete after pouring. In the exemplary embodiment, the predetermined crack element 64 consists of two reinforcing steel grids with shrink-fitted polyethylene film, which are placed on opposite main surfaces of the joint sheet 62.

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are welded on. Due to the local weakening of the concrete cross-section, the crack control element 64 causes the shrinkage cracks in the concrete that form after pouring to form in a controlled manner at the location of the crack control element 64, where they are protected against both pressing and non-pressing water by the joint plate 62.

In order to obtain an easily accessible welding area, the predetermined cracking element can also end slightly above the lower edge 68 of the joint plate 62, as shown in Fig. 6.

To seal double-wall corner joints, an angled sealing element 70 is provided according to the invention, which is shown in plan view in Fig. 7. The two abutting double-wall elements 80 and 82 are provided with guide rails 76 on their lattice girders 86 for receiving the joint plate 72. Like the joint plate of the sealing element 40 described in connection with Fig. 4, the joint plate 72 has two closely spaced bends 75 and 77, each of approximately 135°, the distance between which corresponds to the bends 45 and 47 of the underlying cover element 40, in order to enable simple welding of the two joint plates 44 and 72 in the overlapping area.

Between the two bends 75 and 77, a predetermined crack element 74 is arranged which, due to its orientation, defines a predetermined crack extending from the outer to the inner corner of the outer wall.

After all sealing elements have been installed and welded, the double wall elements can be filled with in-situ concrete once all joint plates have been secured. Sealing elements 20 and 40 for the wall-floor joints and sealing elements 60 and 70 for the wall-wall butt joints together form a complete sealing system for double-wall external walls.

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Claims (19)

1. Sealing element for the production of water-impermeable external walls of rooms set in water-bearing soil using concrete double wall elements ( 16 ) to be placed on a concrete floor slab ( 10 ), with - a support beam ( 22 , 26 ) for integration into the concrete floor slab ( 10 ) and - an elongated flat joint element ( 24 ) held in a vertical orientation by the support beam ( 22 , 26 ), which seals the wall-floor joint after a double wall element ( 16 ) has been erected and poured. 2. Sealing element according to claim 1, characterized in that the support beam comprises a plurality of reinforcing steel brackets ( 22 ) which are rigidly connected to one another along the longitudinal direction of the joint element ( 24 ). 3. Sealing element according to claim 2, characterized in that the reinforcing steel brackets ( 22 ) are formed in one piece. 4. Sealing element according to claim 2 or 3, characterized in that the reinforcing steel brackets ( 22 ) have a horizontal standing area ( 30 ) and two essentially vertical support areas ( 32 ) at which they are connected, in particular welded, to the joint element ( 24 ). 5. Sealing element according to one of the preceding claims, characterized in that the support beam ( 22 , 26 ) is designed and arranged to be placed on a reinforcement layer ( 14 ) of the concrete floor slab ( 10 ) and to be completely integrated into the floor slab ( 10 ). 6. Sealing element according to one of the preceding claims, characterized in that the joint element is formed by a flat joint plate ( 24 ) with a substantially rectangular circumference. 7. Sealing element according to one of claims 1 to 5, characterized in that the joint element is formed by a bent joint plate ( 44 ) with a substantially rectangular circumference, for sealing the wall-sole joint in the region of a corner joint. 8. Sealing element according to claim 7, characterized in that the joint plate ( 44 ) has two closely spaced bends ( 45 , 47 ) of approximately 135° each in order to seal the wall-floor joint in the region of a 90° corner joint. 9. Sealing element according to one of claims 6 to 8, characterized in that the joint plate ( 24 ; 44 ) is arranged in the support beam such that after the support beam ( 22 , 26 ) has been integrated into the floor slab, it is integrated into the floor slab ( 10 ) with a lower vertical partial region ( 34 ), and that an upper vertical partial region ( 36 ) for sealing the wall-floor joint protrudes vertically from the floor slab ( 10 ). 10. Sealing element according to claim 9, characterized in that the lower and the upper vertical portion ( 34 , 36 ) are of equal size. 11. Sealing element for the production of water-impermeable external walls of rooms set in water-bearing soil using concrete double wall elements ( 50 ) with lattice girders ( 56 ) to be placed on a concrete floor slab ( 10 ), with - an elongated flat joint element ( 62 ) which seals the wall-to-wall joint after the erection and pouring of adjacent double wall elements ( 50 ), - a predetermined cracking element ( 64 ) attached to the joint element ( 62 ) and extending along the longitudinal direction and perpendicular to the surface of the joint element ( 62 ), and - two guide rails ( 66 ) for vertical fastening to the lattice girders ( 56 ) of the adjacent double wall elements ( 50 ), which are designed and arranged to receive opposite longitudinal edges of the joint element ( 62 ) when erecting the double wall elements ( 50 ). 12. Sealing element according to claim 11, characterized in that the predetermined tear element ( 64 ) is provided with a plastic coating. 13. Sealing element according to claim 11 or 12, characterized in that the joint element is formed by a flat joint plate ( 62 ) with a substantially rectangular circumference. 14. Sealing element according to one of claims 11 or 12, characterized in that the joint element for sealing a corner joint is formed by a bent joint plate ( 72 ) with a substantially rectangular circumference. 15. Sealing element according to claim 14, characterized in that the joint plate ( 72 ) for sealing a 90° corner joint has two closely spaced bends ( 75 , 77 ) of approximately 135° each, wherein the predetermined crack element ( 74 ) is optionally arranged between the two bends. 16. Concrete double wall element ( 50 ; 80 , 82 ) with two concrete shells ( 52 , 54 ) connected by lattice girders ( 56 ; 86 ), characterized in that the lattice girder ( 56 ; 86 ) is provided with a vertical guide rail ( 66 ; 76 ) on opposite sides for receiving the joint element ( 62 ; 72 ) of a sealing element ( 60 ; 70 ) according to one of claims 10 to 15. 17. A space set in water-bearing soil with a concrete floor slab ( 10 ) and concrete double wall elements ( 16 ; 50 ; 80 , 82 ) placed on the floor slab and cast with in-situ concrete, characterized in that a plurality of first sealing elements ( 20 ; 40 ) according to one of claims 1 to 10 are incorporated into the floor slab ( 10 ), the joint elements ( 24 ; 44 ) of which overlap one another at the joint and are welded together in the overlap region. 18. Room according to claim 17, characterized in that the wall-wall joints of adjacent double wall elements ( 50 ; 80 , 82 ) are sealed with second sealing elements ( 60 ; 70 ) according to one of claims 11 to 15, wherein the joint elements ( 62 ; 72 ) of the second sealing elements ( 60 ; 70 ) overlap the joint elements ( 24 ; 44 ) of the first sealing elements ( 20 ; 40 ) on their underside and are welded to them in the overlap region.