FR2469526A1 - Ground beam stabiliser for vertical shutter concrete wall - is tied double cantilever and retracts by sliding in plugged shutter toe notches - Google Patents

Abstract

The adjustable stayed cantilever base frame stabilizes vertical shutters (1) for in situ concrete walls, preventing overturning by wind. It comprises a transverse slidable 'I' section ground beam (6) with two inclined pin-jointed telescopic stays (4,7). Initially the beam is secured to both shutter, and stays, sliding outward to clear the shutter for concrete pouring. A trapezoidal channel section shoe (2) in a shutter (1) edge notch may locate the beam secured by a cotter pin, and may accept a plug when the beam is withdrawn. In addn. an 'H' section shoe (5) may connect the beam and stays (4,7), using top leg holes for stay pins, and using opposed bolts in bottom leg holes to engage the beam web.

Description

 The present invention relates to the building and public works industry and more particularly to a method for stabilizing formwork and formwork. as well as the stabilizer allowing the application.

 We know that the forms are large panels that are arranged vertically two by two to flow between them a suitable material (such as concrete) for the construction of a wall or a partition. During their installation, and before joining them together, the forms are sensitive to the wind which sometimes knocks them down, risking serious accidents. To remedy this drawback, attempts have already been made to use stabilizing legs, but these devices have given rise to other drawbacks.

For example, the grab bars resting on the ground cross the wall during construction. determining large holes which must then be filled in one by one. In addition, important phonic bridges are thus formed.

 The object of the invention is to obtain greater security with less loss of time, as a result of easier maneuvers, and also to avoid the holes to be plugged.

 The subject of the invention is a method for stabilizing formwork and formwork for a wall or partition using formwork, one of which is provided with a stabilizer with a foot passing through the two formwork in screens. , crures provided at their base, characterized in that successively one sets up the formwork with stabilizer then the formwork facing it by joining them together, and that the foot is removed thus revealing the notches which are then closed with appropriate plugs, before pouring the material constituting the wall, so as to form no hole at the base of said wall, at the location of the stabilizer base.

 The subject of the invention is also a form stabilizer comprising at least one foot resting on the ground perpendicular to the form and surmounted by a means for supporting said form at its upper part, characterized in that, a first guide is fixed in a notch provided for this purpose at the base of the formwork and that a second guide is fixed to the base of the support means. that these two guides are in the same alignment and of shapes such that a bar acting as a foot can be accommodated therein and possibly be removed by sliding in one direction or the other; the base is constituted by a profile bar in the shape of an "I" which can be put on and slidable in the guides provided at the base of the panel and the support means.

The means of support can be varied. They can be constituted by at least one telescopic forestay articulated at its upper part, at the back of the said form so as to be more or less tiltable and articulated at its lower part on the securing guide on the stabilizer bar, guide on which is also articulated at the lower end of a strut (bracon), the other end of which is pressed against the panel or secured to it. In this case, the guide articulated at the base of the lutai and the bracon is a section of profile in "H", the lower part of which covers the "I" bar, and is on the upright provided with a bolt arranged under the upper horizontal bar of the "I" in such a way that the guide cannot escape from the stabilizer bar by allowing the manual sliding of the latter, and whose upper part of the "H" is bored for the passage of the axes of subjugation of lutai and the bracon.

Another means of supporting a formwork can consist in fixing on its back a farm or a stiffener whose rear feet are fixed vertically in the rear guide, between the upper uprights of the "H".

Another important characteristic of the invention resides in the guide fixed in the notch provided for this purpose at the base of the sheet. This guide consists of a part evoking the shape of a trapezoid without a large base with upper and lateral walls longer than the thickness of the form and protruding only towards the rear, a hole being provided in the lateral walls for the passage of a locking pin accessible from the rear.

 When the stabilizer bar is removed, the indentation with the guide which follows its outline appears clearly. In the method according to the invention this notch is obstructed by a plug. For this purpose the guide fixed in the notch under the cover constitutes a female part for a male part put in place after the removal of the stabilizing bar, this male part is identical, but smaller than the female part, and closed at its end on the shuttering side and secured so that the latter end projects slightly a few millimeters from said shuttering face.

 It is easy to understand that the male part plays the role of plug and, because it projects, leaves a slight imprint hollow in the wall. This hollow is absolutely not a problem for the installation of a plinth for example. If the stopper had determined a relief imprint it would have been troublesome and would have required sanding. According to the invention when the sheets are removed, the walls are not retouched.

To make the invention easier to understand, an example of an embodiment of a form stabilizer is given below with reference to the appended drawings in which
Fig. 1 is a schematic side view of the stabilizer
Fig. 2 is a side view of the rear guide,
Fig. 3 is a section along III in FIG. 2,
Fig. 4 is a section through the front guide perpendicular to its axis,
Fig. 5 is a section through the front guide along its axis,
Fig. 6 is a section through the male part,
Fig. 7 is another section of the male part.

 The panel 1 is provided at its base with a guide 2 housed in a notch (not shown). Near its upper part at 3 is articulated a forestay 4 formed of two telescopic tubes, the base of which is articulated on the guide 5.

The guides 2 and 5 are mounted on the stabilizing bar 6. Ser the guide 5 is also articulated a leg 7 called bracon, the other end of which is supported on the panel 1, near its lower part.

The guide 5 is in the shape of an "H", the upper uprights 8w9 of which are pierced with holes 10, 11 and 10 'and 11' for the passage of the hinge pins of the forestay 4 and of the container 7. The horizontal part "H" is referenced 12 and the lower uprights-13 and 14. Each of these uprights is crossed by a bolt 15-16 whose rod is turned inward and of adjustable length. In light lines, in Figs. 2 and 3, we see the stabilizer bar 6 in "I" (for example Standard JFNOR "IPN 100") whose upper horizontal bar 6 is between element 12 of "H" and bolts 15-16.Les rods of these bolts serve as a guide for the sliding of the stabilizing bar 6, and above all as a guide for the guide 5. It is easy to understand that this guide 5 has little play on the bar 6, that it cannot be removed other vertically, nor mime toggle appreciably.

Figs. 4 and 5 show the guide 2 evoking the general shape of a bottomless trapezium whose upper base 17 is slightly inclined. This part 17 as well as the sides 1 & 9 are slightly longer than the thickness of the vertical section panel 1 and protrude towards the rear. If this panel is metallic, the guide 2 is metallic too, and preferably welded in the notch provided for this purpose at its base. In the sides 18-19 are provided holes 20-20 'for the passage of a pin or hook 22 made captive by a chain 23. This guide 2 covers the stabilizer bar 6 during the establishment of the form.

 When the two side panels facing each other (not shown in the drawings) are joined together, the bar 6 is removed by sliding. The guide 5 is then empty and appears as a female part in which the male part 24 is slipped. , almost identical to part 2 but slightly smaller, closed at 25 and stiffened internally by a rette bar 26.

 The slope of the upper part 27 of the part 24 is the same as that of the upper part 17 of the part 2. It is easy to make the part 24 penetrate from the outside (inwards) into the part 2 and to block it using the pin 22 passing through the holes 20-28, 28'-20 '. The length of the male part 24 is such that it slightly exceeds the formwork face, for example from one to five millimeters.

The formwork being ready for casting, we proceed in the usual way. Concrete (or other material) falls to the bottom, without any reservation. After removal of the part 24, when the formwork is undone, a non-perforated wall is obtained right through the base, due to the withdrawal of the stabilizer bar 6. There is also no relief, and the wall is not to be sanded. We are well aware that the sheet stabilization and shuttering method according to the invention saves time while ensuring great safety in work.

Claims (8)

R E V E N DI C A T I O TJ S  1. Method for stabilizing formwork and formwork for an aur or a partition using formwork, one of which is provided with a stabilizer with a foot crossing the two formwork in notches provided at their base, characterized in that successively, the panel is put in place with stabilizer, then the panel facing it, joining them together, and the foot is removed, thus revealing the notches which are then closed with appropriate plugs, before the flow of the material constituting the wall, so as to form no hole at the base of said wall at the location of the foot of the stabilizer. 2. Tarpaulin stabilizer comprising at least one foot resting on the ground perpendicular to the tarpaulin and surmounted by a means for supporting said tarpaulin at its upper part, characterized in that a first guide is fixed in a notch provided for this effect at the base of the sheet and that a second guide is fixed to the base of the support means, that these two guides are in the same alignment and of shapes such that a bar acting as Fied can be accommodated therein and possibly be removed by sliding in one direction or the other.  3. Stabilizer according to any one of the preceding claims, characterized in that the base consists of a profiled bar in the shape of an "I" which can be put on and slidable in the guides provided at the base of the panel and the support means.  4. stabilizer for a formwork according to claim 2, characterized in that the formwork support means is constituted by at least one telescopic prop articulated at its upper part on the back of said form so as to be more or less tiltable, and articulated at its lower part on the securing guide on the stabilizer bar. guide on which is also articulated the lower end of a strut (bracon), the other end of which is pressed against the panel or secured to it.  5. Stabilizer according to claim 2 or 4, characterized in that the guide articulated at the base of the forestay and the bracon is a section of profile in "E", the lower part of which covers the bar in "I" and is by upright provided with a bolt arranged under the upper horizontal bar of the "I" in such a way that the guide cannot escape from the stabilizing bar while allowing manual sliding of the latter, and of which the upper part of the "H" is bored for the passage of the pins for securing the forestay and the bracon.  6. form stabilizer according to claim 2, characterized in that the means Ae support of the form is fixed along its back, and is constituted by a strong or a stiffener whose rear feet are fixed vertically in the rear duide. between the upper amounts of the "H"  7. Stabilizer according to any one of claims 1 to 3, characterized in that the guide fixed in the notch provided at the base of the form is a part evoking the shape of a trapezoid without large base, with upper walls and lateral longer than the thickness of the form and only protruding towards the rear, a hole being provided in the lateral walls for the passage of a locking pin accessible from the rear. 8. Stabilizer according to any one of claims 1, 2, 3, 7 characterized in that the guide fixed in the notch under the form constitutes a female part for a male part put in place after the removal of the stabilizing bar, this male part is identical but smaller than the female part and closed at its end c8té shuttering face and secured so that the latter end is slightly projecting a few millimeters from said formwork face.