IL172020A - Building device - Google Patents

Description

Building Device Inventor: Alon Kave Patent Attorney: Marc Zuta Building Device TECHNICAL FIELD This invention relates to grasping devices for creating reinforced concrete formations, and more particularly to disposable devices for holding steel rods in reinforced concrete formations.

BACKGROUND OF THE INVENTION Reinforced concrete is used in buildings for creating columns, walls, floors, foundations and other formations . Reinforced concrete is important for providing strong support to a building, room or space.

Reinforced concrete comprises a set of steel rods, which are encased within concrete .

In order to create reinforced concrete formations, a mold is built using wood boards or plywood or metal boards. Within the space of the boards, the steel rods are placed and tied so that they are stable and secure.

Concrete is poured into the mold, and after it dries out the formation is ready and the wood boards or plywood or metal boards are removed.

The steel rods are tied only to insure the exact location of each rod within the concrete , and the concrete is responsible for holding the steel rods in their locations after it dries out. Thus, these manually made ties are of no use after the concrete dries out.

It is very important that the steel rods be placed at the specific, precise location according to the design , and remain there during the process of pouring the concrete thereon.

The existing process requires arranging and tying steel rods together in order to form the core of the steel rods , which should span all or most of the concrete's volume.

- - - A grid of steel rods should be created, including parallel and perpendicular rods, which are tied together in almost each junction of two perpendicular rods .

Building this heavy and massive grid of steel rods is a tedious process which consumes a lot of time for the workers, because almost at each junction of two rods a tie should be made. It is a labor-intensive process. This tie is made using steel wires, and requires the attention of the worker in each such junction point.

For thicker steel rods, which are more heavier, more ties are required, with larger ties and a double tie may be used to ensure the steel rods will not move when pouring the concrete.

Furthermore, the material used for tying the rods and the spacers is not recognized as part of the structure, and the builder is not compensated for its cost, since it is only used during the construction stage. Thus, for the builder this is a net loss of revenues.

After creating the grid of steel rods, it should be placed within the wood boards or plywood or metal boards for allowing pouring concrete within.

In addition to the difficulty of placing the boards and the grid of steel rods in general, the grid should also be placed, within the mold of the wood boards or plywood, at some distance from the external surface. This is to protect the metal rods from the environment.

Thus, additional means are required in order to properly hold the grid at some distance, while securing it so that when the concrete is poured, the grid of steel rods will not move.

Instead of using the wood boards or plywood or metal boards with the creation of the grid, the two are created separately and should be also placed at the correct distance from each other.

Thus, much time and effort is required in order to build reinforced concrete formations nowadays. This is relevant for columns, walls, floors and ceilings, foundations and other building parts or formations, which require reinforced concrete .

- - - SUMMARY OF THE INVENTION This invention describes a novel grasping device with which it is easier to create reinforced concrete formations.

The new grasping device enables connecting and holding directly the steel rods in required locations relatively to the wood boards or plywood.

The new grasping device can be connected to wood boards or plywood or metal boards using nails or screws easily, and then hold the steel rods in some distance from the boards.

The novel grasping device is useful for building reinforced concrete columns, walls, foundations, floors, ceilings and other formations.

With this grasping device, the mold is built together with the steel rods' grid. Thus, as the mold is built, grasping devices are placed in it as required, and as the steel rods are placed in the grasping devices, they are automatically connected to them, saving the need for additional means.

Using these grasping devices, the steel rods would be placed within the space of the boards, and there is no need to tie them or to further insure they are stable and secure.

Similarly, the concrete is poured into the mold, and after it dries out the formation is ready and strong; the wood boards or plywood can then be removed .

The grasping device makes the process of arranging the steel rods together easier and faster, and the core of the steel rods, can span all or most of the concrete 1 s volume , and can be designed , according to the placement of grasping devices on the boards .

The grasping device is compatible for making a grid of steel rods which include parallel and perpendicular rods. The grasping device would preferably be placed at each junction of two perpendicular rods.

Although the grid of steel rods is heavy and massive, the placement process does not consume a lot of time for the workers, because the rods are automatically connected at almost each junction, such as by pressing them into the grasping device.

There is no need to use ties or steel wires, and less attention is required by the worker because the rods are automatically connected strongly, not necessarily at each junction point.

Due to the rigidity of the device, it is not necessary to install it at every junction of the steel rods. Rather, the devices may be installed at a larger distance therebetween, for example at a distance of about 60 centimeters from each other.

For thicker rods it is possible to place the ties farther apart from each other.

Upon completing the connection of the steel rods, the grid is already placed within the wood boards or plywood and ready for placement and for pouring concrete within.

The boards and the grid of steel rods created on it, form one unit, and the grasping devices insure the grid is placed at the required distance within, at the mold of wood boards or plywood.

Thus, there is no need to use any additional means to properly hold the grid at some distance, and the grid is secured by the grasping device so that when the concrete is poured, the grid of steel rods will not move.

The grid of steel rods is built on the wood boards or plywood, and the two are compatible with each other and provide the correct distance and allocation with regards to each other.

Thus, using the new grasping device saves time and effort. This can help building reinforced concrete formations at lower cost.

The novel system and method may be used in building columns, walls, floors and ceilings , foundations and other building parts or formations , which require reinforced concrete .

- - - BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 illustrates a cross-section view of a reinforced concrete formation with grids of steel rods and surrounding wood boards or plywood Fig. 2 details an isometric view of a new grasping device which is connectable to wood boards or plywood and compatible for holding a grid of perpendicular and parallel steel rods Fig. 3 details an isometric view of the connection of the new grasping device to wood boards or plywood and to a grid of perpendicular and parallel steel rods Fig. k details an isometric view of another embodiment of a new grasping device which is connectable to wood boards or plywood and to two grids of perpendicular and parallel steel rods DETAILED DESCRIPTION OF THE INVENTION The following invention shall now be described by way of example, and with reference to the accompanying drawings .

Fig. 1 illustrates a cross-section view of a reinforced concrete formation with grids of steel rods and surrounding wood boards or plywood.

A reinforced concrete formation comprises surrounding wood boards or plywood 1 and 2. In this embodiment , the reinforced concrete formation may be a wall , thus it would require surrounding boards from its both sides.

The concrete is in all of the space between the boards, in the created mold.

Within the space between the boards, there are two grids of steel rods.

Preferably, each such grid is parallel to the surrounding wood boards or plywood .

- - - The right grid near boards 1 is comprised of parallel 31 and perpendicular 32 steel rods, with regards to the page. Preferably, this grid is in some distance with the concrete so that the rods would be held firmly, and will provide adequate support to the concrete itself as well.

Similarly, the left grid near boards 2 is comprised of parallel 33 and perpendicular 34 steel rods .

Preferably, this grid too is buried a predefined distance within the concrete so that the rods would be held firmly, and will provide adequate support to the concrete itself.

Each circle marks the perpendicular rods as well as the junction points seem in cross-section, hence at each such point the new grasping device, which is connected to a wood board or plywood, can hold two rods.

After the concrete dries out, the boards 1 and 2 are removed.

Referring to Fig. 2, the new grasping device may be connected to the boards or other external support means using screws and/or nails, connected through holes 12 on plate 41.

In a preferred embodiment, there may be four such holes, allowing fast and easy installation of the grasping device to wood boards or plywood.

In a preferred embodiment, the grasping device has four arms 42-45. In this embodiment, the arms are compatible with a grid of perpendicular and parallel steel rods (normal and parallel to the plane of the drawing), wherein the grasping device is placed in junctions of steel rods of the grid.

Between each two adjacent arms there may be a groove. The groove between arms 43 and 44 may be wider at area 443, allowing to insert a rod, by passing it through the groove from above, while applying a measure of pressure .

In the embodiment of Fig. 3, nails 415 are used to connect the grasping device's plate 41, to a wood board or plywood 61. The plate insures the device is in a right angle with the board, enforcing the grid of steel rods to be at a fixed and constant distance from the boards.

- - - The embodiment of Fig. i* illustrates the use of the new grasping device for supporting two grids of steel rods. This embodiment can comprise two perpendicular bars 51 and 52, each supporting other set of grasping means and parallel steel rods.

It will be recognized that the foregoing is but one example of an apparatus and method within the scope of the present invention and that various modifications will occur to those skilled in the art upon reading the disclosure set forth hereinbefore.

Claims (12)

CLAIMS What is claimed is:

1. A grasping device for holding steel rods for creating reinforced concrete formations, comprising connecting means for mold or surrounding means and grasping means for holding the steel rods without ties or wires.

2. The grasping device according to claim 1, wherein the device further includes means for creating and holding a grid of steel rods, which comprises parallel and perpendicular rods.

3. The grasping device according to claim 2, wherein the device further includes means for creating and holding a grid of steel rods at or near junction points, thus each grasping device can hold two perpendicular steel rods .

. The grasping device according to claim 3 , wherein the device further includes a plate with hole means which allow connecting it to a fixed surface, and four arms with grooves therebetween for inserting and holding the steel rods.

5. The grasping device according to claim , wherein the device further includes barrier means for securing the steel rods after their insertion.

6. The grasping device according to claim k , wherein the grooves between the four arms are so shaped as to allow the insertion of steel rods with some pressure, whilst holding them, by using grooves with a larger width inside .

7. The grasping device according to claims 5 or 6 , wherein the device is so shaped as to include a fixed distance between the plate and the location of the rods, to insure the rods are at a desired depth within the concrete.

8. The grasping device according to claim 7, wherein the arms are perpendicular to the plate, ensuring that the steel rods grid would be parallel to an external surface or mold.

9. A grasping device with means for holding two steel rod grids for creating reinforced concrete formation with two grids, comprising connecting means between the grids, and grasping means for holding the steel rods of each grid without having to use ties or wires.

10. The grasping device according to claim 9, wherein the connecting means between the two grids comprise one or more bars.

11. The grasping device according to claim , wherein the devices are installed at a larger distance therebetween, with the distance increasing as the thickness of the steel rods increases.

12. The grasping device according to claim 9, wherein the devices are installed at a distance of about 60 centimeters therebetween. Marc Zuta, Patent Attorney for Applicant