FR2957957A1 - Frame support for casing structure of concrete slabs in building construction site, has four spacers maintaining four frames, where frames are placed on frame support in separate manner, and projections engaged in angle part of one frame - Google Patents

Frame support for casing structure of concrete slabs in building construction site, has four spacers maintaining four frames, where frames are placed on frame support in separate manner, and projections engaged in angle part of one frame Download PDF

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Publication number
FR2957957A1
FR2957957A1 FR1001208A FR1001208A FR2957957A1 FR 2957957 A1 FR2957957 A1 FR 2957957A1 FR 1001208 A FR1001208 A FR 1001208A FR 1001208 A FR1001208 A FR 1001208A FR 2957957 A1 FR2957957 A1 FR 2957957A1
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Prior art keywords
frames
support
frame
formwork
spacers
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Granted
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FR1001208A
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French (fr)
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FR2957957B1 (en
Inventor
Claude Say
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DEKO
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DEKO
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Classifications

    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04GSCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G11/00Forms, shutterings, or falsework for making walls, floors, ceilings, or roofs
    • E04G11/36Forms, shutterings, or falsework for making walls, floors, ceilings, or roofs for floors, ceilings, or roofs of plane or curved surfaces end formpanels for floor shutterings
    • E04G11/48Supporting structures for shutterings or frames for floors or roofs
    • E04G11/486Dropheads supporting the concrete after removal of the shuttering; Connecting means on beams specially adapted for dropheads
    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04GSCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G11/00Forms, shutterings, or falsework for making walls, floors, ceilings, or roofs
    • E04G11/36Forms, shutterings, or falsework for making walls, floors, ceilings, or roofs for floors, ceilings, or roofs of plane or curved surfaces end formpanels for floor shutterings
    • E04G11/38Forms, shutterings, or falsework for making walls, floors, ceilings, or roofs for floors, ceilings, or roofs of plane or curved surfaces end formpanels for floor shutterings for plane ceilings of concrete

Abstract

The invention relates in particular to a method of constructing a formwork for pouring a concrete slab, which comprises the following operations: - using struts equipped with frame supports capable of sliding along the struts, the frame supports comprising four struts spacing frames, - arranging the frames on the frame supports, so that the adjacent frames are separated by a substantially identical distance, - arranging the formwork panels joined to the frames, and - securing these formwork panels to frames to form a substantially planar, continuous, and horizontal form skin.

Description

TECHNICAL FIELD The present invention relates to structures, especially forestay heads, for the formwork of slabs, roofs, or concrete floors, to formwork systems including such structures. , and to formwork processes using these structures and formwork systems. STATE OF THE ART In order to cast a concrete slab during construction, a formwork wall, sometimes referred to as a "form skin" or "formwork skin", which is substantially horizontal and supported above the ground, is generally put in place. an existing floor, by props resting on the floor or floor. The connection between the shuttering wall and the props is generally made by intersecting beams supporting the shuttering wall and resting on the struts, by juxtaposed frames resting on the struts, or by a system comprising beams and frames. The patent FR2508958 describes a formwork structure comprising panels resting on beams supported by props using "connecting heads". These heads comprise a sleeve sliding along the strut and a plate having four hooking lugs of four beams in two orthogonal directions. The sliding heads can take a first position for supporting the formwork panels, in which the beams are flush with a plate on the top of the forestay. In a second position, the beams are lowered and can be separated from the props that then support only the slab until it is completely dry. The patent FR2916466 describes a formwork structure in which primary beams are supported on platens capable of sliding along the struts. The primary beams support secondary beams that support the plywood formwork skin.
A disadvantage of these structures and formwork systems is the length of time required to mount them on a construction site. EP130425 and EP297357 disclose a formwork for floor consisting of contiguous formwork panels. The panels include a frame with side members and cross members. The contiguous angles of four adjacent panels are supported by a plate equipped with a protrusion at each corner and several ribs. WO2009 / 015866 discloses a similar structure having corner centering surfaces of four adjacent formwork panels. These formwork systems require either to be left in place until complete drying of the slab, or to set up "drying" props when the formwork system is disassembled, in order to support the slab until it is dry. full. GB 1029131 discloses a floor formwork having rows of panels joined in a horizontal direction and spaced in another horizontal direction, as well as beams filling the spaces between two adjacent rows of panels.
Panels and beams are wood panels with reinforced slices. A disadvantage of the formwork systems comprising wooden panels reinforced with a frame, is that the finish of the underside of the slab is poor, because of the unevenness formed on this face by the frames of the formwork panels. In formwork systems with joined panels, the presence of a gap between the respective edges of two adjacent panels causes sagging between the panels when the concrete is poured. This results in a sticking of the laitance on the fields of the panels, which requires the cleaning of the panels between each use.
Moreover, when these panels are tight against each other, it is difficult to "break down" the slab to dismantle the formwork system. It has also been described in FR2900176, a support structure of a formwork skin which comprises parallel primary beams supporting frames arranged at regular intervals. Each frame is composed of secondary beams connected by spacers, each secondary beam end having a stop for its attachment to a primary beam.
A disadvantage of this support structure is that it requires to have a multitude of beams and frames of different sizes, to make slabs of various sizes and shapes. A disadvantage of most of these formwork systems is that the constituent elements have such a mass that they can not be handled by one person. Another disadvantage of most of these formwork systems is that, for the construction of a formwork two and a half or three meters above the floor or an existing floor, it is necessary that operators use a step ladder or the like to set up the constituents of the formwork, which presents risks of accidents. SUMMARY OF THE INVENTION An object of the invention is to propose a slab formwork method, a slab formwork system and components of such a system, which are improved and / or which partly remedy the problem. least, to the shortcomings or disadvantages of known slab formwork systems. An object of the invention is to provide a slab formwork method, a slab formwork system and components of such a system, which allow secure manual mounting from the ground or an existing floor, up to a height of 3 or 4 meters.
An object of the invention is to provide a slab formwork method, a slab formwork system and components of such a system, which allow a quick and easy assembly and disassembly of the formwork skin and the system supporting it. An object of the invention is to provide a slab formwork method, a slab formwork system and components of such a system, which are adapted to simply perform the formwork of a slab whose contour has a shape and any dimensions. According to one aspect of the invention, there is provided a frame support for a slab formwork structure, which comprises four spacers for keeping spaced two by two, four frames (not contiguous) resting on the frame support. The invention applies in particular to a support for slab formwork frames which comprises: a body provided with a cylindrical opening allowing the body to slide along a tubular (cylindrical) portion of a strut or an extension of forestay; four portions (or faces) integral with the body, extending substantially along a plane perpendicular to the axis of the cylindrical opening, equidistant from this axis, arranged to support respectively four portions of corresponding support of four formwork frames; and four substantially identical abutments projecting respectively with respect to the four portions or bearing faces, and arranged to center and / or respectively retain the four frames by limiting or preventing the sliding of the four formwork frames on the four portions or support faces. According to one aspect of the invention, the formwork frame support further comprises four spacers arranged to maintain at a distance from each other, four slab formwork frames in contact with the bearing portions or faces and / or with the stops. According to embodiments of a frame support: - the four spacers - or spacers - extend from a flat plate perpendicular to the axis of the cylindrical opening; the flat plate is part of the body of the support and comprises the four portions or bearing faces; - The four spacers - or spacers - are in the form of substantially flat ribs, substantially identical dimensions to maintain the frames equidistant from each other; the four spacers - or spacers - extend respectively from the four edges of a flat square-contoured plate forming part of the support body; the support portions and the abutments are, like the spacing spacers of the frames, regularly distributed angularly about an axis, in particular around the axis of the cylindrical opening; the frame support comprises a locking / unlocking structure designed to cooperate with an abutment protruding from the outer surface of a strut (tubular) bar in order to prevent - and conversely to allow - the free sliding of the 20 frame support along the stay bar, beyond this stop. According to one embodiment, this locking / unlocking structure comprises: - a first integral part (rigidly) of the frame support and provided with a first notch adapted to the abutment of the strut 25 to allow, in a first mutual angular position of the forestay bar and the frame support, the sliding of the first part along the forestay bar by passing the abutment through the first notch, and - a second part integral with the support of frames and provided with a second notch adapted to the abutment of the stay bar to allow, in a second mutual angular position of the forestay bar and the frame support, distinct from the first angular position, the sliding of the second piece along the stay bar by passing the stop through the second notch. The second part of the locking / unlocking structure is preferably movable relative to the first part and relative to the body of the frame support, in particular sliding along an axis perpendicular to the longitudinal axis of the stay bar. According to another aspect of the invention, it is proposed a forestay head - or a strut - which comprises: - a bar, generally tubular and of circular section, of which one end is equipped with a plate orthogonal to the axis of the bar; and a frame support slidably mounted around and along the bar, which comprises four spacers making it possible to keep apart four frames resting on the frame support. Preferably, the spacers make it possible to maintain four frames spaced apart in pairs by a distance at least equal to - and close to - the length of the side of the smallest square in which can fit the plate equipping the end of the stay bar. According to another aspect of the invention, there is provided a slab formwork structure 20 which has adjacent frames spaced apart from each other. The formwork structure may include a small number of frame formats, in particular at most 4, 6, or 8 different frame formats. Each frame has a force transmission structure, generally metal, and at least one piece of wood integral with the force transmission structure. Formwork skin elements, such as wood panels, can be placed on the frames and attached to the wood pieces, by nailing, for example, in a contiguous manner, to form a substantially planar, continuous, and horizontal form skin. For this purpose, it is preferable to use plywood panels whose surface is greater than that of the frames. The frames are supported by frame supports slidable along the struts, under a plate fitted to the upper end of the strut. Each frame support may have four projections disposed at the vertices of a square. Each projection is arranged to engage in a corner portion of a frame. Each frame support further comprises four spacers arranged to cooperate respectively with four frames resting on the support, in order to keep the adjacent frames distant from each other. Also preferably, the frames are maintained substantially equidistant in pairs, along two substantially orthogonal axes 15 of a horizontal plane, by the spacers - or spacers - which are substantially identical. According to another aspect of the invention, there is provided a method of constructing a formwork for casting a concrete slab, in which: - props with frame supports are used which are slidable along the struts; frame supports having four frame spacers - frames are provided on the frame supports so that the adjacent (neighboring) frames are separated by a substantially identical distance and preferably within a range of ten centimeters approximately to fifteen centimeters, and - one has the elements - or panels - skin formante contiguous on the frames, and one secures these panels of formante skin to the frames, so as to form a skin formante. Other aspects, features, and advantages of the invention appear in the following description which refers to the appended figures and illustrates, without any limiting character, preferred embodiments of the invention. BRIEF DESCRIPTION OF THE FIGURES FIG. 1 illustrates, in side view, a forestay head equipped with a frame support, in a configuration where the frame support is kept at a small distance from the end plate fitted to the head of the frame. strut, which allows to maintain the upper surface of frames supported by the frame support, substantially flush with the upper surface of the plate, to support a formwork skin.
FIG. 2 illustrates, in perspective view, the upper part of the forestay head and the frame support of FIG. 1. FIG. 3 illustrates, in side view and at another angle, the forestay head. FIG. 1, in a configuration - called "dechilting" - where the frame support is kept at a greater distance from the end plate fitted to the forestay head, which allows the frames of the formwork skin to be separated from each other, separate the frames from the frames supports. Figures 4 to 6 illustrate, in perspective view from different angles, the upper part of the forestay head and the frame support of Figures 1 to 3, in different configurations of the structure for the locking / unlocking mutual support of frames and the stay bar. Figures 7 and 8 respectively illustrate, in top view, a frame according to two embodiments. Figure 9 illustrates, in perspective view and from below, a frame supported by three struts in an angle of a construction in progress. FIG. 10 illustrates, in perspective view and from above, the placing of a second frame adjacent to that illustrated in FIG. 9. FIG. 11 illustrates, in perspective view, from above, and on an enlarged scale, the upper part. a forestay head whose frame support 30 supports three frames adjacent two by two. Figure 12 illustrates, in perspective view and from above, the establishment of contiguous panels on frames of a formwork system.
Unless implicitly or explicitly stated otherwise, structurally or functionally identical or similar elements are designated by identical reference numerals in the different figures. DETAILED DESCRIPTION OF THE INVENTION With reference to FIGS. 1 to 6 in particular, the strut head 20 comprises a tubular bar 21 whose upper end is equipped with a plate 22 orthogonal to the longitudinal axis 23 of the bar. The plate 22 has a square contour whose angles are rounded and is pierced with an orifice in the vicinity of each angle (see Figures 4 to 6 and 11 in particular). The forestay head 20 also comprises a frame support 24 slidably mounted around the bar 21, along a portion of this bar, under the plate 22, between this plate and a stop 25 fitted to the lower part of the bar. 21.
The frame support 24 has four spacers 26 for holding apart four frames 27 - such as those illustrated in Figures 7 and 8 in particular - resting on the frame support 24. The spacers 26 are arranged to keep the four frames spaced apart in pairs by a distance 28, 11 and 12, which is at least equal to - and close to - the length of the side of the smallest square in which can be inscribed. the plate 22. The plate 22 may comprise a square outline whose length of the sides is close to 10 or 11 centimeters, the length 29 (FIGS. 3 and 11) of the spacers 26 being at least equal to and close to the length of these sides. The free space extending between two adjacent frames is then wide enough to allow to insert between the frames an additional strut provided with an end plate of the same dimensions. This is useful for supporting the formwork skin by such additional props, until complete drying of the slab cast on the formwork skin, and allows in the meantime the props equipped with the sliding frame support, for another site of construction.
With reference to FIGS. 1 to 6 in particular, each support 24 of frames comprises a metal body comprising four identical plates 30 connected two by two by four equally identical gussets 31.
The plates 30 are arranged regularly distributed angularly about an axis of symmetry substantially coinciding with the axis 23 of the strut 21: the angle of the dihedral formed by two adjacent plates 30 is 90 degrees, and the plates 30 are coplanar two by two.
The gussets 31 are coplanar, extending in a plane perpendicular to the axis of symmetry substantially coincident with the axis 23. The upper portions 32 of the plates 30, which extend above the plane of the gussets 31, form four projections arranged to cooperate with - in particular to engage in - a corner portion of a frame 27, as illustrated in Figure 10 in particular. The plates 30 and the gussets 31 delimit a central cylindrical opening extending along the axis of symmetry. This opening allows the body - and the support - to slide along a tubular portion of a forestay.
The gussets form four portions or bearing faces extending equidistant from the axis of symmetry of the upper part of the body, serving to support respectively four corresponding support portions of four formwork frames. The four identical protrusions or abutments 32 protruding from the gussets prevent slippage of the formwork frames resting on the gussets. The projections 32 form four planar ribs extending radially with respect to the axis 23. Each rib 32 has an inclined edge 33 (see FIG. 6 in particular) for causing a sliding of the angles of the frames resting on these ribs. in the direction of the axis 23, that is to say a "centering" of the frames 27 on the frame support.
As illustrated in FIGS. 1 to 6, the spacers 26 have a contour of substantially rectangular shape and extend respectively from the peripheral edges of the gussets 31, along planes parallel to the axis 23.
The four spacers 26 are in the form of flat ribs, of identical dimensions, to maintain the frames equidistant from each other. The frame support 24 also comprises a locking / unlocking structure arranged to cooperate with an abutment 34 protruding from the outer surface of the stay bar 21, in order to prevent - or conversely to allow - the sliding of the support frames along the stay bar, beyond this stop. As shown in FIGS. 3 and 5 in particular, two stops 34 are respectively formed by the two ends of a cylindrical piece with an axis 35 perpendicular to the axis 23 of the bar 21, which extends through two diametrically opposite openings provided in the tubular wall of the bar 21. The locking / unlocking structure comprises a first piece 36 rigidly secured to the body 30, 31 of the frame support, and a second piece 37 secured to the frame support and mounted to move in translation relative to the first piece. Each of the parts 36, 37 has a generally cylindrical shape whose cross section takes the form of a "U".
The piece 37 is engaged inside the piece 36 whose ends of the wings are bent, so that the piece 36 forms a slideway within which the piece 37 can slide along an axis 38 parallel to the respective longitudinal axes of these two parts and perpendicular to the longitudinal axis of the forestay bar.
The piece 36 is pierced with an extended opening by a first notch 39 adapted to the stop 34 of the stay bar: this opening, which extends in the extension of the cylindrical opening defined by the parts 30, 31, has a shape - in particular a circular shape - and dimensions adapted to allow the sliding of the frame support along the bar 21. As illustrated in Figure 6 in particular, the notch 39 has a shape and dimensions adapted to those of the abutment 34 to allow, in a first mutual angular position of the forestay bar and the frame support, the sliding of the first piece 36 - and the frame support 24 - along the stay bar 21, by passage of the stop 34 through the first notch 39.
The piece 37 is also pierced with an opening 40 extended by a second notch 41 (see Figure 4) adapted to the abutment 34 of the stay bar: this opening 40, which extends in the extension of the opening provided in the piece 36 and the cylindrical opening defined by the parts 30, 31, has a shape and dimensions adapted to allow the sliding of the frame support along the bar 21. As illustrated in Figure 4 in particular, the opening 40 has an elongated shape - in particular an oblong shape - along the axis of mutual sliding of the parts 36 and 37, to allow this sliding. As illustrated in FIG. 4 in particular, the notch 41 has a shape and dimensions adapted to those of the abutment 34 to allow, in a second mutual angular position of the forestay bar and the frame support, which is distinct from the first mutual angular position of these parts, the sliding of the second part 37 - and the support 24 of frames - along the bar 21 of forestay, by passing the stop 34 through the second notch 41. In the mode embodiment shown in Figures 1 to 6, the recesses 39, 41 have a shape respectively elongated along two axes perpendicular to the axis 23 and angularly offset by 90 degrees. FIGS. 2, 4 and 6 in particular show that slide 37 sliding in slideway 36 further comprises two stops 42, 43 capable of coming into contact with stop 34 in order to limit the amplitude of the mutual sliding of parts 36, 37. In the "curved" configuration illustrated in FIGS. 1 and 2, the pieces 36, 37 of the frame support 24 extend between the stop 34 and the plate 22, the support 24 resting on the stop 34 via the In this configuration, the distance 44 between the respective upper faces of the bearing portions of the support 24 and the plate 22 is substantially equal to the height of the frames 27 resting on these support portions, so that the upper faces these frames and the plate 22 are substantially coplanar. In order to separate these frames from the formwork panels that they support, the corresponding frame supports are lowered by sliding along the supports that support these supports.
For this purpose, slide the slide 37 of the support 24 considered, along the axis 38, so as to bring the abutment 34 and the notch 41 together, as illustrated in FIG. 4, which allows a first sliding (towards the bottom) of the support 24 along the strut, until this stop 34 is in contact with a part of the workpiece 36, which corresponds to the configuration shown in FIG. 3. In this "decintrated" configuration, the distance 45 separating the respective upper faces of the support portions of the support 24 and the plate 22 is greater - about five or ten centimeters for example - at the height of the frames 27 resting on these support portions, so that the frames resting on this support are dissociated and removed from the formwork skin: the frames can then pivot relative to the support 24 and be disengaged projections 32. To completely disengage one of the frames resting on four supports, it causes an additional sliding 2. To this end, these supports are pivoted by 90 degrees around the axis 23 of the corresponding struts, so as to bring the abutment 34 and the notch 39 into alignment with each other. illustrated in Figure 6, which allows an additional sliding (downwards) of the support 24 along the forestay. This sliding can be extended thanks to the presence of a notch 46 similar to the notches 39, 41, which is provided in the gussets 31 in the extension of the notch 39, until the lower part of the support 24 is at contact of the lower stop 25 (Figures 1 and 3) of the forestay head. The frames that rest on the support can then be completely separated from these supports.
With reference to FIGS. 7 and 8, each frame 27 comprises two (FIG. 7) or three (FIG. 8) parallel members 50 interconnected by four cross members 51, 52 perpendicular to the longitudinal members, as well as one (FIG. 7) or two (FIG. Figure 8) boards or blades 53 of wood parallel (s) to the side members and whose width is greater than their thickness.
The distance 70 separating a spar 50 from a board 53 is preferably of the order of 10 to 15 centimeters. The beams and sleepers forming the frame structure to withstand the weight of the concrete poured to make a slab, are generally metallic, while the boards 53 facilitate the temporary attachment to frames, panels placed on these frames. It can be seen in FIG. 9 that the intermediate crosspieces 52 are pierced with openings 75, unlike the end crosspieces 51. This makes it possible to reduce the weight of the frame and to facilitate the manipulation of the frame 27 by an operator 77 located under the frame as illustrated in FIG. 10: the operator can easily grasp the frame by hand or by engaging a tool - such as a pole or cane - in one of these openings. Referring to Figure 9, the frame 27 rests on three supports 24 engaged around the upper portion of struts 55 resting on the ground, and on two supports 56 secured to the walls 57 of the current construction, against which walls the frame is attached.
FIG. 10 illustrates a configuration similar to that of FIG. 9, in which a first frame attached to the walls 57 is supported by four stays equipped with supports 24, and in which an operator positions two corner portions 54 of a second frame 27b in respective support on two adjacent supports 24 supporting the first frame: the frame 27b is, in inclined position, hooked to the two respective projections of the two adjacent supports, then brought to substantially horizontal position, by pivoting on / against the two projections which the partially maintain.
Two other stands equipped with supports 24 are then erected on the ground 58 to support the frame 27b by its two other corner parts, which can be done by an operator standing on the ground. It can be seen from FIG. 12 that the formwork structure comprises numerous frames 27 supported by struts 55, via frame supports 24, the adjacent frames being spaced from each other by a distance 28 that is substantially identical for all pairs of adjacent frames: the frames are maintained substantially equidistant two by two, along two substantially orthogonal axes of a horizontal plane, by the spacers of the frame supports.
The formwork structure comprises wood panels 60 placed on the - and attached to - frames, joined to form a continuous form skin, the surface of each wood panel being greater than that of the largest of the frames 27. The structure of formwork may comprise four different formats of frames, in particular a first format of a square outline such as that of FIG. 7, a second format of a rectangular outline whose width is equal to that of a frame of the first format and whose length is equal to twice this width plus the common length 29 of the spacers 26, a third format of frames whose width is half that of the frames of the first format, and a fourth format of frames whose width is half of the frames of the second format.
If necessary, the formwork structure may comprise frames of a fifth square format whose width is equal to half that of the frames of the first format. The formwork structure can be put in place to support the formwork skin for a limited time to one or a few days after pouring the slab onto the form skin. At the end of this period, the frames - and, where appropriate, the frame supports 24 equipping forestay extensions 20 such as those illustrated in FIGS. 1 and 3 - can be detached from the formwork structure 10 so as to be used immediately for the construction of another formwork structure, the stresses stressed in compression and the remaining panels 60 alone in place until complete drying of the slab. In addition, for this purpose, the struts - or extensions of struts - equipped with frame supports can be replaced by ordinary struts ("drying") whose upper plate is engaged between two adjacent frames, as and when measurement of dismantling frames, to support the formwork skin until complete drying of the slab.

Claims (5)

  1. Claims 1 - Support (24) frames for a slab formwork structure, characterized in that it comprises four spacers (26) for keeping apart four frames (27) resting on the frame support.
  2. 2 - Support according to claim 1 which comprises a body (30, 31, 36, 37) provided with a cylindrical opening allowing the body - and the support - to slide along a tubular portion (21) of a prop (55).
  3. 3 - Support according to any one of claims 1 or 2 which comprises four projections (32) arranged to cooperate with - in particular to engage in - a corner portion of a frame, and wherein the four spacers s extend from a plate (31) forming part of the support body and having four portions or support faces for four frames.
  4. 4 - Support according to any one of claims 1 to 3 which comprises: - four portions or integral support faces of the body, extending substantially along a plane, equidistant from a perpendicular axis (23) plan, arranged to support respectively four corresponding support portions of four formwork frames; and four substantially identical protrusions or abutments (32) protruding respectively from the four portions or bearing faces, and arranged to center and / or retain respectively four formwork frames by limiting the - or preventing - the sliding of the four frames on the four portions or bearing faces, the support portions and the projections or abutments being, like the spacing spacers of the frames, regularly distributed angularly about the axis (23), in particular around the axis of the cylindrical opening, and the spacers being arranged to maintain at a distance from each other, four formwork frames in contact with the portions or bearing faces and / or with the projections or stops. - Support according to any one of claims 1 to 4 wherein the spacers extend from edges of the support body.
  5. 6. Support according to any one of claims 1 to 5 wherein the four spacers are in the form of substantially planar ribs of substantially identical dimensions to maintain the frames equidistant from each other. 7 - Support according to any one of claims 1 to 6 which comprises a structure (36, 37, 39, 41) for locking / unlocking arranged to cooperate with a stop (34) projecting from the outer surface of a bar ( 21), in order to prevent - or conversely to allow - the sliding of the frame support along the stay bar, beyond this stop (34). 8 - Support according to claim 7 wherein the locking / unlocking structure comprises: - a first piece (36) rigidly secured to the frame support and provided with a first notch (39) adapted to the stop (34) of the bar forestay for allowing, in a first mutual angular position of the forestay bar and the frame support, the sliding of the first piece along the forestay bar by passing the abutment through the first notch, and a second piece (37) secured to the frame support and provided with a second notch (41) adapted to the stop (34) of the forestay bar to allow, in a second mutual angular position of the bar of forestay and the frame support, distinct from the first angular position, the sliding of the second piece along the stay bar by passing the stop through the second notch. 9 - Support according to claim 8 wherein the second part (37) of the locking / unlocking structure is movable relative to the first part and relative to the body of the frame support, in particular sliding along a perpendicular axis (38). to the longitudinal axis (23) of the stay bar. 10 - head (20) of forestay - or forestay (55) - which comprises a bar (21) whose one end is equipped with a plate (22) orthogonal to the longitudinal axis (23) of the bar, as well as a frame support (24) according to any one of claims 1 to 9, which is slidably mounted around the bar. 11 - head - or forestay - according to claim 10 wherein - or which - the spacers (26) are arranged to maintain four frames spaced two by two from a distance (28) at least equal to - and close to - the length of the side of the smallest square in which the platinum can be inscribed. 12 - slab formwork structure which comprises frames (27) supported by supports (24) of frames slidable along the struts (55), the frame supports being in accordance with any one of claims 1 to 9, characterized in that the adjacent frames are distant from each other. 13 - Structure according to claim 12 wherein each frame comprises a structure (50, 51, 52) of force transmission, generally metallic, and at least one piece (53) of wood integral with the force transmission structure. 14 - Structure according to claim 13 wherein the width of the (or) piece (s) of wood is greater than its (their) thickness, this width preferably being in a range from about ten centimeters to fifteen centimeters . 15 - Structure according to any one of claims 12 to 14 wherein the frames are maintained substantially equidistant (28) in pairs, along two substantially orthogonal axes of a horizontal plane, by spacers (26) substantially identical being part of frame supports. 16 - Structure according to any one of claims 12 to 15 which comprises panels (60) placed on the - and attached to - frames (27), in a contiguous manner, and forming a form skin. 17 - The structure of claim 16 wherein the surface 5 of at least some of the panels (60) is greater than that of the largest of the frames. 18 - Structure according to any one of claims 12 to 17, which comprises identical frames having a first square outline format, and identical frames having a second format of rectangular contour whose width is equal to that of a frame of the first format and whose length is equal to twice this width plus the common length (29) of the spacers (26) of the frame supports (24). 19 - Structure according to any one of claims 12 to 18, which comprises at most 6 or 8 different formats of frames. 20 - Method for constructing a formwork for pouring a concrete slab, characterized in that it comprises the following operations: - use struts equipped with frame supports capable of sliding along the struts, frame supports comprising four 20 spacers spacing frames, - arrange the frames on the frame supports, so that the adjacent frames are separated by a substantially identical distance, - arrange the panels of formwork contiguous skin on the frames, and 25 - securing these forming skin panels to the frames to form a substantially planar, continuous, and horizontal form skin. 21. The method of claim 20 wherein the struts are in accordance with any one of claims 10 or 11, and wherein the distance (28) separating two adjacent frames is in the range of from about ten centimeters to six inches. about.
FR1001208A 2010-03-26 2010-03-26 Structures, systems, and methods for forming slabs Expired - Fee Related FR2957957B1 (en)

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CN103255915A (en) * 2013-04-26 2013-08-21 吕新杰 Anti-sliding main keel and auxiliary keel combined structure made of steel replacing wood for construction
ITPD20120411A1 (en) * 2012-12-28 2014-06-29 Faresin Building Division S P A Improved formwork structure for the execution of horizontal castings for the construction of floors
EP2759658A1 (en) * 2013-01-24 2014-07-30 Faresin Building Division S.p.A. Apparatus for performing horizontal castings to provide floor slabs
CN104533077A (en) * 2014-12-17 2015-04-22 中国建筑股份有限公司 Telescopic platform for hydraulic climbing form frame and manufacturing method of telescopic platform
DE102015223772A1 (en) * 2015-11-30 2017-06-01 Peri Gmbh Column head, ceiling support with such a column head and slab formwork with such a ceiling support
EP3438365A1 (en) * 2017-08-02 2019-02-06 DOKA GmbH Ceiling formwork and method for producing a ceiling element
DE102019107430A1 (en) * 2019-03-22 2020-09-24 Peri Gmbh Connection strip for ceiling formwork

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CA2962013A1 (en) * 2016-03-24 2017-09-24 Faresin Building S.P.A. Formwork for performing horizontal castings for the provision of floors
US10407925B2 (en) 2017-07-10 2019-09-10 Doka Gmbh Method of installing a formwork support system, formwork support system and longitudinal beam
US10487521B2 (en) * 2017-07-10 2019-11-26 Doka Gmbh Formwork support system and method of installing a formwork support system
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Cited By (11)

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ITPD20120411A1 (en) * 2012-12-28 2014-06-29 Faresin Building Division S P A Improved formwork structure for the execution of horizontal castings for the construction of floors
EP2749713A1 (en) * 2012-12-28 2014-07-02 Faresin Building Division S.p.A. Formwork structure for the execution of horizontal castings for the provision of floor slabs
EP2759658A1 (en) * 2013-01-24 2014-07-30 Faresin Building Division S.p.A. Apparatus for performing horizontal castings to provide floor slabs
CN103255915A (en) * 2013-04-26 2013-08-21 吕新杰 Anti-sliding main keel and auxiliary keel combined structure made of steel replacing wood for construction
CN103255915B (en) * 2013-04-26 2015-07-29 吕新杰 Anti-slip type for building pays keel combining structure so that steel generation wood is main
CN104533077A (en) * 2014-12-17 2015-04-22 中国建筑股份有限公司 Telescopic platform for hydraulic climbing form frame and manufacturing method of telescopic platform
CN104533077B (en) * 2014-12-17 2016-08-17 中国建筑股份有限公司 A kind of scalable platform in hydraulic climbing formwork support body and preparation method thereof
DE102015223772A1 (en) * 2015-11-30 2017-06-01 Peri Gmbh Column head, ceiling support with such a column head and slab formwork with such a ceiling support
EP3438365A1 (en) * 2017-08-02 2019-02-06 DOKA GmbH Ceiling formwork and method for producing a ceiling element
WO2019025513A1 (en) 2017-08-02 2019-02-07 Doka Gmbh Method for producing a ceiling element and ceiling formwork
DE102019107430A1 (en) * 2019-03-22 2020-09-24 Peri Gmbh Connection strip for ceiling formwork

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FR3017891A1 (en) 2015-08-28
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