| JP07119117 | ASSEMBLY METHOD AND STRUCTURE FOR STRUT OF ELEVATED ROAD AND FOUNDATION BODY |
| WO/2002/035025 | FLOOR STRUCTURES |
| JP3893282 | PREFABRICATED BUILDING |
HUIJGEN, Joost Adrianus Antheunis (Sint Bonifaciuslaan 11, NA Eindhoven, NL-5643, NL)
SCHALKWIJK, Gijs Willem (Willem Barentzstraat 36, KL Eindhoven, NL-5612, NL)
HUIJGEN, Joost Adrianus Antheunis (Sint Bonifaciuslaan 11, NA Eindhoven, NL-5643, NL)
| CLAIMS; I . A formwork module for constructing a foundation, comprising: a formwork comprised of a bottom and two vertical side walls fixed to the bottom, as well as - a cage of reinforcement accommodated in the formwork, and interconnection elements which are coupled to the formwork and are fixed to the cage of reinforcement, characterised in that the couplings between the formwork and the interconnection elements are such that they can convey these tensile forces. 2. A formwork module as claimed in claim 1, characterised in that coupling elements to which interconnection elements are coupled are fixed to the side walls of the formwork. 3. A formwork module as claimed in claim 1 or 2, characterised in that the formwork module further includes a filling element accommodated in the formwork and which is connected to the interconnection elements. 4. A formwork module as claimed in claim 3, characterised in that the interconnection elements are coupled each with a first end portion to the formwork, with a second end portion to the filling element and with a middle portion to the cage of reinforcement. 5. A formwork module as claimed in claim 4, characterised in that the middle portion is clamped to a wire of the cage of reinforcement. 6. A method of constructing a prefabricated formwork module for a foundation, comprising: constructing a formwork comprised of a bottom and two side walls fixed to the bottom, as well as constructing a cage of reinforcement, and inserting the cage of reinforcement into the formwork, characterised in that the formwork and the cage of reinforcement are coupled by the interconnection elements so that the couplings can convey tensile forces. 7. A method as claimed in claim 6, characterised in that two coupling elements are integrated with the formwork, which coupling elements are to be installed in the side walls of the formwork while the interconnection elements are coupled to the formwork by coupling them to the coupling elements. |
DESCRIPTION
Field of the invention.
The invention relates to a formwork module for constructing a foundation, comprising: a formwork comprised of a bottom and two vertical side walls fixed to the bottom, as well as a cage of reinforcement accommodated in the formwork, and - interconnection elements which are coupled to the formwork and are fixed to the cage of reinforcement.
State of the art.
A spacer unit which can be used in a formwork module of this type is known from GB-A-1525708. This known spacer unit is used for fixing the reinforcement in the formwork and is encased in the formwork.
In present-day construction practice the ground beams are prefabricated or made on-site. Both methods have their own specific advantages and drawbacks. For example, the method according to which the ground beams are poured on-site is characterised by a brief preparatory period and a long execution period, whereas prefabricated ground beams are characterised by a long preparatory period and a brief execution period. When ground beams are poured on-site, modifications can be realised in a simple manner, as contrasted with prefabricated ground beams. Furthermore, when ground beams are poured on-site, the coupling to other construction elements can be realised in a simpler manner.
Summary of the invention.
It is an object of the invention to provide a formwork module with which ground beams can be poured on-site and advantages of the two known methods are there but the drawbacks are not. To this end the formwork module according to the invention is characterised in that the couplings between the formwork and the interconnection elements are such that they can convey these tensile forces. With a formwork module according to the invention a foundation can also be poured on-site with ali attendant advantages. This is possible because the interconnection elements stop the side walls of the formwork, so that they cannot bend outwards. Since prefabricated formwork modules are used when the foundation is poured, the execution time is short and the execution is not labour-intensive. The known spacer units cannot absorb tensile forces, so that when these spacer units are used the side walls of the formwork are to be safeguarded differently against bending outwards.
An embodiment of the formwork module according to the invention is characterised in that coupling elements to which interconnection elements are coupled are fixed to the side walls of the formwork. As a result, the force exerted by the interconnection elements on the formwork can be distributed more evenly over the length of the formwork. During the pouring operation these side walls are subjected to an outwardly directed force which is caused by the pressure of the concrete.
The formwork module preferably further includes a filling element accommodated in the formwork and which is connected to the interconnection elements.
Furthermore, the interconnection elements are preferably coupled each with a first end portion to the formwork, with a second end portion to the filling element and with a middle portion to the cage of reinforcement. The middle portion must not be movable in vertical direction because otherwise the filling element cannot be retained in place. By clamping the filling element to the cage of reinforcement shifting of the filling element is avoided. The invention also relates to a method of constructing a prefabricated formwork module for a foundation, comprising: constructing a formwork comprised of a bottom and two side walls fixed to the bottom, as well as constructing a cage of reinforcement, and - inserting the cage of reinforcement into the formwork.
With respect to the method the invention is characterised in that two coupling elements are integrated with the formwork, which coupling elements are to be installed in the side walls of the formwork while the interconnection elements are coupled to the formwork by coupling them to the coupling elements. An embodiment of the method according to the invention is characterised in that two coupling elements are integrated with the formwork, which coupling elements are to be installed in the side walls of the formwork while the interconnection elements are coupled to the formwork by connecting them to the coupling elements.
Brief description of the drawings.
The invention will be described in more detail based on an example of embodiment of the formwork module according to the invention shown in the drawings while reference is made to the appended drawing figures, in which:
Fig. 1 shows a cross-sectional view of an embodiment of the formwork module according to the invention;
Fig. 2 shows a side view of an interconnection element of the formwork module; and Fig. 3 shows a top view of the interconnection element.
Detailed description of the drawings.
Fig. 1 shows a cross-sectional view of an embodiment of the formwork module according to the invention. The formwork module 1 comprises a formwork 3 which is formed by an extruded EPS (expanded polystyrene) container of a substantially
U-shaped cross section provided with a bottom 3a having longitudinally extending grooves and two vertical sidewalls 3b affixed to the bottom. The formwork module further includes a filling element 5 embedded in the formwork, which filling element 5 is formed by an extruded sleeve also made of EPS. The formwork module further includes a cage of reinforcement 7 which is accommodated between the formwork and the filling element, as well as a plurality of interconnection elements 9 of ABS
(acrylonitrile butadiene styrene). These interconnection elements are connected with a first end portion 9a via coupling elements to the formwork 3 in such manner that tensile forces can be conveyed. The interconnection elements are further inserted into the filling element 5 with a second end portion 9b and are clamped with their middle portion 9c to the cage of reinforcement 7.
Extruded coupling elements 11 are attached to the two side walls 3b of the formwork, which coupling elements 1 1 are connected with their first end portions 9a to the interconnection elements 9. The formwork 3 and the two coupling elements 11 are jointly extruded to one whole as a result of which the coupling elements are rigidly attached to the formwork.
The sectional views of the formwork 3 and the filling element 5 are identical for all applications of the formwork module. Only the cage of reinforcement 7 differs for each application. The strength of the cage of reinforcement 7 is adapted to the required strength of the foundation.
The cage of reinforcement 7 is comprised of longitudinally extending rods 7a and holders fixed thereto and transversely arranged relative to the longitudinally extending rods 7a to which holders the interconnection elements 9 are clamped with their middle portion 9c. The cage of reinforcement 7 and the interconnection elements 9 jointly hold the side walls 3b of the formwork together, so that the formwork kan withstand the pressure of the concrete during the pouring of the concrete. Furthermore, the cage of reinforcement 7 and the interconnection elements 9 keep the filling element 5 in place, so that this is not floating upwardly by the upward force of the concrete during the pouring of the concrete. The interconnection elements are inserted into the filling element for example with their two end portions. This connection is sufficient because it is not burdened by tensile load.
Figs. 2 and 3 show the interconnection element 9 of the formwork module in side view and top view respectively. The side view of the first end portion 9a of the interconnection element shows the shape of the tip of an arrow that is received by the coupling element as a result of which this connection can vonvey tensile forces. The side view of the second end portion 9b of the interconnection element shows a sawtooth-like profile of which the teeth function as barbs when the interconnection element is inserted into the filling element.
The middle portion 9c of the interconnection element 9 is formed by a strip 9c having an omega-shaped cross section, as well as a slide 9d. The strip 9c can be clamped around a wire of the cage of reinforcement as a result of the shape of the strip. By subsequently moving the slide 9d over the middle portion 9c, the wire of the cage of reinforcement is secured.
Albeit the invention has been described in the foregoing with reference to the drawings, it should be pointed out that the invention is not by any manner or means restricted to the embodiments shown in the drawings. The invention also extends over any embodiment deviating from the embodiment shown in the drawing Figures within the spirit and scope defined by the claims.