DE29700133U1 - Foundation reinforcement - Google Patents

Description

HAUCK, GRAALFS, WeHNÖ£t, ÖÜRING*, SIMMONS

HAMBURG - MUNICH - DÜSSELDORF
4 0 422-19

PATENT- U, LAWYER ■ NEUER WALL41 ■ 20354 HAMBURG

1. JOKTNEN, Reijo Harkkoraudantie 6 FTN-00700 Helsinki

2. VFRTAVUORI, Juha Harkkoraudantie 6 FIN-00700 Helsinki

EDO GRAALFS, Dipl.-Ing. NORBERT SIEMONS, Dr.-Ing. HEIDI REICHERT, Attorney-at-Law Neuer Wall 41, 20354 Hamburg P.O. Box 30 24 30,20308 Hamburg Telephone (040) 36 67 55, Fax (040) 36 40 Telex 2 11 769 inpat d

HANS HAUCK, Dipi.-Ing. WERNER WEHNERT, Dipl.-Ing. Mozartstraße 23, 80336 Munich Telephone (089) 53 92 36, Fax (089) 53 12

WOLFGANG DÖRING, Dr.-Ing.

Mörikestrasse 18,40474 Düsseldorf Telephone (0211) 45 07 85, Fax (0211) 454 32

DELIVERY ADDRESS/PLEASE REPLY TO:

HAMBURG,

6 January 1997

Foundation reinforcement

The invention relates to a foundation reinforcement provided with a formwork wall construction, which serves to create ground-supporting strip foundations, pile foundations or similar foundations and whose reinforcement includes a reinforcement grid, the reinforcement bars or wires of which are connected to one another at the crossing points.

In the usual foundation constructions, the reinforcement remaining in the concrete casting and the formwork walls are two separate structures. Normally, the formwork walls are removed again after casting. Recently, reinforcement grids have also been made.

...12

Patent Attorneys ■ European Patent Attorneys ■ Authorized Representatives before the European Patent Office
Authorised representatives at the Office for Harmonisation in the Internal Market

Lawyer: admitted to the Hamburg courts

Deutsche Bank AG Hamburg, No. 05 28497 (bank code 200 700 00) ■ Postbank Hamburg, No. 28 42 206 (bank code 200 100 20)
Dresdner Bank AG Hamburg, No. 933 60 35 (bank code 200 800 00)

Formwork wall constructions have been used that are covered with plastic sheets or panels to hold back the concrete. In these cases too, the reinforcement and the formwork walls must be installed and supported separately in the pit provided for the foundation.

The aim of this invention is to develop an improved foundation structure in which the reinforcement and the formwork are connected to each other in order to obtain a reinforcement and formwork structure that is quick to install, lightweight and cost-competitive, and which does not require stripping after the concrete has been poured.

This aim is achieved in the invention by the features of the claims.

Embodiments of the invention are described below, with reference to the attached figures.

Figure 1 shows the reinforcement and formwork unit

shown as a perspective view, and

Figure 2 shows the same unit in cross-section, but the formwork is constructed in a different way.

Figure 3 shows a further embodiment of a reinforcement and formwork unit according to the invention.

Figure 4 shows one part of the reinforcement and formwork unit according to Figure 3.

Figure 5 shows a third embodiment of a reinforcement and formwork unit according to the invention in section.

The common feature of the structures shown in Figures 1 and 2 is that the reinforcement grid 1 (floor) above the foundation floor, which runs mainly horizontally, and the support structure 5 for the formwork walls are created by bending a single reinforcement grid. In the case presented, the reinforcement grid is formed by the longitudinal reinforcement bars 3 and the transverse reinforcement bars 2, which are connected to each other at the intersection points, e.g. by upset welding.

Of course, other reinforcement grids and mats can also be used.

U-shaped bends 4 are attached to the transverse bars 2 so that their height is sufficient to raise the reinforcement grid 1 far enough above the base of the foundation that it remains in the concrete casting as a grid that functions as reinforcement. The transverse bars 2 function during casting as connecting rods that stiffen the formwork and later, in the final state in the hardened concrete, as transverse anchoring rods that reduce the required joint length at the extension points of the longitudinal reinforcement.

In the case shown in Figure 1, the support structure 5 is covered on both sides with a plastic sheet 6, which forms the formwork for the concrete. The plastic sheet 6 is guided with its lower edge to under the lower edge of the U-shaped bars so that the concrete mass cannot ooze out from under the formwork walls.

In the case shown in Figure 2, polystyrene plates 7 or other appropriate insulation plates are attached to the support structure 5 for frost protection. The lower edges of the plates 7 are located in the U-shaped

Bending of the reinforcement bars 2. In this case, the formwork wall is formed by the insulation panels, which act as thermal insulation during the manufacturing phase and as frost insulation in the final state after the concrete has hardened. The function of the reinforcement corresponds to that of the structure shown in Figure 1.

The embodiment of Figure 3 is similar to that of Figure 2, except that it is composed of two separate halves as shown in Figure 4. The width of the mold can be changed by attaching the bottom sections la and lb of the halves with a different degree of overlap. The connection can be made by welding or by connecting with wire. The advantage of this simple standard construction (Figure 4) is that the distance between the walls 5 can be freely chosen. Furthermore, rectangular or square molds with four walls can be assembled from the elements of Figure 4 cut to suitable lengths.

In Figure 5, the floor 1' is composed only of transverse steel bars 2, without the use of longitudinal bars 3. The bars 2 of opposite halves are inserted in pairs into transverse tubes 8, namely at opposite

ends. The length of the tubes or sleeves 8 is chosen according to the desired width of the foundation or the foot to be cast. After the concrete has been poured and hardened, the steel grid halves can be removed by pulling the rods 2 out of the tubes 8, which prevent the rods 2 from sticking to the surrounding concrete. The thermal insulation 7 remains on both sides of the foundation. If thermal insulation 7 is not required, the walls 5 can be covered with plastic film, as shown in Figure 1.

Finally, it should be noted that in all embodiments it is essential that the base 1 or 1' is located a certain distance above the lower end of the bends 4.

Claims (9)

A...&eegr;. Sayings 1. F l.achf undament reinforcement with a formwork wall construction
for constructing strip foundations, pile foundations or similar foundations resting on the ground, with a reinforcement grid whose reinforcement bars (?., 3) are connected to one another at the crossing points, characterized in that an approximately horizontally arranged reinforcement grid (1) located above the ground of the flat foundation and the supporting structure (5) of approximately vertically running formwork walls (6, 7) form a uniform reinforcement grid, the ground (1, 1') being at a distance from the subsoil. 2. Foundation reinforcement according to claim 1, characterized in that
that the distance is formed by downwardly bent sections (4) between the vertical support structures (5) and the floor (1, 1'). 3. Foundation reinforcement according to claim 1 or 2, characterized in that the formwork is formed by a plastic film (6) which is arranged inside and outside on the vertical support structure (5) and the outer film is pulled under the curved sections (4). 4- Foundation reinforcement according to claim 1 or 2, characterized in that the formwork is formed by panels (7), in particular heat-insulating panels, which are inserted into the curved sections (4) on the inside of the vertical support structures (5). 5. Foundation reinforcement according to claim 4, characterized in that the width of the plates (7) corresponds approximately to the width of the bends (5). 6. Foundation reinforcement according to one of claims 1 to 5, characterized in that the floor (1) and the vertical support structures (5) are bent from a uniform reinforcement grid or a uniform reinforcement mat. 7. Foundation reinforcement according to one of claims 1 to 5, characterized in that a horizontal floor section (la) is attached to each vertical support structure and the floor sections (la) are connected to one another in an overlapping manner. 8. Foundation reinforcement according to claim 7, characterized in that each retaining wall construction (5) with a floor section (la) consists of a one-piece Grid or a one-piece mat made of reinforcing material. 9. Foundation reinforcement according to claim 7 or 8, characterized in that the floor sections (la) consist only of transverse rods (2) and the rods (2) of associated vertical support structures (5) are inserted into opposite ends of pipes (2).