EP0808965B1 - Form for making arched openings in walls - Google Patents

Description

The invention relates to a shuttering device according to the preamble of Patent claim 1 and according to the preambles of the independent claims 22, 24, 25 and 26.

For the construction of building arches is usually a formwork for each sheet made of wood and usually destroyed after use or on removal. This means a considerable work and material costs.

From AU-B-69 705/81 is a reusable formwork device for building bows known in the case of a lying inside the bow central hub a Variety spoke-like outwardly divergent support arms pivotally mounted is. Each support arm is on the flexible formwork skin in an anchoring point either fixed or hinged and adjustable in length to set different bow shapes and / or spans and switched on Condition to be able to wear. The adjustments are time consuming and cumbersome because a plurality of points of arc curvature must be set, which then the Formwork describes, so to speak, as an envelope. The at the largest span the Bogenenden supporting, both support arms verlagem in an adjustment of the Span with shortening of the arc length down to over the bow ends, because the formwork is not longitudinally movable relative to the support arms.

One known from EP-A-0 136 906 adjustable shuttering device for multiple use has a two-part formwork skin, whose parts are in a hinge joint connected to one another to be able to cover pointed arches. At a central hub is pivotally mounted a plurality of spoke-like support arms, which are connected at their free ends firmly with the formwork skin parts. The hinge joint Includes a lever mechanism to wrap even round arches too can. The adjustment of the many support arms is tedious and time consuming.

In a known from DE-A-22 60 847, adjustable shuttering device is the one-piece formwork skin of a variety radiating from a central hub clamp worn outgoing support arms whose lengths are variable. The Handling the formwork device for changing the span and / or arch shape is time consuming and tedious.

In one known from DE-A-23 34 020, adjustable shuttering device for Stichbögen or pointed arches is a variety spoke-like support arms to a central Hub clamp arranged. Each support arm has a fixed point of articulation the formwork and is pivotable relative to the formwork skin. For segmental arches is the Formwork skin equipped with longitudinally displaceable end sections, which also on Support arms are held. The handling when adjusting the arch shape and / or span is time consuming and cumbersome and requires special skill.

In one known from DE-A-195 09 078 scarfing device for creating arched Lintels of doors and windows is telescopic in a center support a central support arm up and down, which supports a curved shuttering panel in the middle from below. At the center support a transverse support is fixed, in the horizontal support arms are adjustable in length, the cross member to hold the curved Wear chalkboard. Between the middle support arm and the horizontal support arms On each horizontal support arm further supports are attached, which are radially to the Chalkboard upwards. In another embodiment, the ends are the variable-length formwork panel hinges on the crossmembers set the horizontal support arms.

In one known from GB-B-14 32 142 scarfing device is on a height-adjustable Section of a center support whose free end under the curved formwork skin engages, on fixed swivel fittings on both sides each a swiveling, length-adjustable Support arm arranged, whose end in a hinge with the end the formwork is hinged.

The object of the invention is to provide a formwork device for sheets, with All types of sheet used in construction are produced quickly and precisely can.

This object is achieved by a shuttering device having the features of one of the claims 1, 22, 24, 25 or 26.

With a shuttering device of the type according to the invention, round arches, Basket bows, pointed arches and segmental arches in all radii, as well as isosceles and unequal-sided arches are produced. Also the production of vaults by joining several elements is possible.

There are different spans and wall thicknesses with one and the same formwork device getting produced.

The support arms carry at their free ends clamps, which are always correct angle to the vertical support strut. Due to the parallel sliding cross struts the parallelogram of each arm is a perfect radius determination of all Bow types always guaranteed. By the possibility of the lower cross strut to move, as well as through various formwork clamps, it is possible to all Slopes and bow types with one and the same formwork device cover.

With such, particularly frequently used formwork device can For example, spans from 60cm to 1,60m made without changing the system become.

It is advantageously provided that for the vertical support strut a conventional Steel support is used, as it is used on construction sites.

According to the invention, a suitable formwork skin of three clamps, i.e. up, left and right, held. Due to the fixed clamping of the Formwork skin at the three clamps and by a displacement of the support arms along the strut and a displacement of the horizontal strut can each Bow type can be produced quickly and accurately. An additional assumption of the Formwork is no longer necessary due to the arrangement of the three clamps.

The material used for the formwork can be wood, plastic or metal.

Instead of each designed as a parallelogram, pivoting support arms can according to claim 25 or claim 26 and individual support arms or according to claim 24 scissor-shaped and according to claim 22 open parallelograms used be either fixed or slidably connected to the support strut are. According to claim 26, the attachment or support of the support arms at the upper end of the support strut done. The multifunctionality is due to the adjustability of the lateral support arms and the horizontal Support reached. Since the lateral Holding arms are charged to "train" is preferably a holding mechanism as a corresponding dimensioned chain used or according to claim 25 each one adjustable tilt slide arm. The various arc radii and spans can also achieved by the telescopically adjustable horizontal struts according to claim 26 become.

With a shuttering device of the type according to the invention and according to the claims 22 to 26 may have round arches, basket arches and segmental arches in all radii as well as isosceles and unequal-sided arches are produced. Also the Production of vaults by joining several elements is possible.

The holding arms hold according to the invention at their free ends terminals, but the at right angles to the vertical support strut. By the sliding Cross struts of the support arms or by the horizontal orientation of the crossbar when using the individual support, is a perfect radius determination all types of bow always guaranteed. By the possibility of the horizontal To move the cross strut or the holding arms, as well as by various Cladding clamps, it is possible to include all inclinations and bow types with and to cover the same formwork device.

As a support strut props produced specially for the purpose of support be used, in particular those with a center guide for moving the horizontal strut or holding arms.

Fig. 1

einen schematischen Aufriß einer erfindungsgemäßen Schalungsvorrichtung;

Fig. 2

einen Schnitt einer oberen Schalhautklemme in Fig. 1,

Fig. 3

einen Schnitt einer seitlichen Schalhautklemme der Schalungsvorrichtung von Fig. 1,

Fig. 4

schematisch die Einstellung der Schalungsvorrichtung für einen Spitzbogen,

Fig. 5

eine Innenansicht der Schalhaut im Bereich einer Klemme,

Fig. 6,7,8

schematische Aufrisse der Schalungsvorrichtung bei der Herstellung unterschiedlicher Bögen,

Fig. 9

einen schematischen Aufriß einer weiteren Ausführungsform der Schalungsvorrichtung,

Fig. 10

einen schematischen Aufriß einer weiteren Ausführungsform der Schalungsvorrichtung,

Fig. 11

einen schematischen Aufriß einer weiteren Ausführungsform der Schalungsvorrichtung,

Fig. 12

einen schematischen Aufriß einer weiteren Ausführungsform der Schalungsvorrichtung, und

Fig. 13

eine Abbildung einer konkret gebauten Ausführungsform.

Hereinafter, embodiments of the invention will be described with reference to the figures. Show it:

Fig. 1

a schematic elevation of a formwork device according to the invention;

Fig. 2

a section of an upper formwork clamp in Fig. 1,

Fig. 3

1 is a section of a side skin clamp of the formwork device of FIG. 1, FIG.

Fig. 4

schematically the setting of the shuttering device for an ogive,

Fig. 5

an inside view of the formwork in the area of a clamp,

Fig. 6,7,8

schematic elevations of the shuttering device in the production of different sheets,

Fig. 9

a schematic elevation of another embodiment of the shuttering device,

Fig. 10

a schematic elevation of another embodiment of the shuttering device,

Fig. 11

a schematic elevation of another embodiment of the shuttering device,

Fig. 12

a schematic elevation of another embodiment of the shuttering device, and

Fig. 13

an illustration of a concretely constructed embodiment.

The essential parts of the formwork device are a vertical support strut 1, a Formwork skin 2 and two laterally extending from the support strut 1 holding arms 3. Die Formwork skin 2 is elastic, but has a sufficient residual stress to the on bearing in situ concrete or to carry the masonry. Suitable materials for the formlining 2 are PVC, plastics, steel or wood.

The formwork 2 is both at the top of the vertical support strut 1 and to the free ends of the support arms 2 by clamps 4, 5 held. Instead of the terminal 4 at the top of the vertical support strut 1 could also be a firm connection between the formwork 2 and the support strut 1 may be provided.

Each of the two support arms 3 is a lower cross member 6 and an upper Cross strut 7 is formed, which together with holding plates 8, 9 form a parallelogram. The holding plates 8 are by means of a flange 10 and a tension clamp 11 on the attached vertical support strut. The upper crossbars 7 are by means of bolts 12 in the holding plates 8 stored.

Each lower transverse strut 6 is connected to a pin 13 in a circular arc-shaped guide 14 mounted in the holding plate 8, wherein the circular arc-shaped guide 14, for example is formed by a slot.

The holding plates 9 are by means of axes 15 at the lower and upper cross struts 6, 7 attached.

On each support plate 9, a support plate 16 is rotatably mounted, which is the terminal. 5 carries (Fig. 1).

The terminals 4, 5, as shown in FIGS. 2, 3 U-shaped bracket 17, 18, the Include facing 2. On side bars of the U-shaped bracket 17, 18 are inside directed hooks 19, 20 formed on which clamping parts 21, 22 attack. Both Clamps 5 (Fig. 3) are the clamping parts 22 of a clamping bar 23 and a Clamping screw 24 is formed. By turning the clamping screw 24 is the Clamping bar 23 moves in the direction of the double arrow in Fig. 3, whereby the formwork skin 2 is either clamped or released.

In the clamp 4 (FIG. 2) the clamping parts 21 are formed by rotatable levers 25, by means of screws 26, which are supported on abutment 27, in the direction of Double arrow of Fig. 2 are pivotable, whereby the bracket 17 either stretched or is released.

By pivoting the holding arms can round arches with different diameters or spans are produced. Fig. 1 shows the shuttering of a Round arch set shuttering device.

If the support plates 16 are pivoted into the position shown in phantom in FIG. 1, the formwork device is converted to cover a segmental arch.

For the production of pointed arches is preferably a split form skin 2 '(Fig. 4) used, which is held at the top of the support strut 1 by holding parts 28, the are connected via a hinge 29 in a sheathing.

Since the retaining clips 17, 18 do not protrude laterally (FIGS. 2 and 3), the formwork device be arranged between vertically aligned shuttering plates, the border laterally.

In addition, vertical supports 30 (Fig. 6) may be provided which are the outer boundaries make up for the bow.

In the holding plates 8, a display plate (not shown) may be provided with a scale be, by means of the exact angular adjustment of the support arms 3 is adjustable. Likewise, the formwork 2 in the region of the terminal 5, a scale 31 or more Have scales 31, which pivot the support arms 3 and thus the adjustment facilitate the radius of the bow.

In Fig. 1, the shuttering device is intended for encasing a semicircular arc, e.g. With maximum span, set. Dashed are a semi-circular arc smaller Span and a basket arch smaller span shown, with the lateral Clamps 5 just as angularly with respect to the vertical central support strut 1 are held, as in the extended positions for the large span.

In Fig. 6 is formed of in-situ concrete segmental arch or stitch arch with large Span turned on. The vertical radius is smaller than the horizontal radius.

In Fig. 7 is with the shuttering device and upwardly pivoted support arms. 3 a basket bow turned on, the vertical radius or stitch height is smaller than that horizontal radius.

In Fig. 8, a basket arch with a large span is turned on, in which the formwork 2 abuts a considerable height at the vertical boundaries of the bow and the stitch height is less than half the horizontal span.

In Fig. 9, a further embodiment of the shuttering device is shown, in which the two support arms 3 on the vertical central support strut 1 of one or two aligned horizontal sliding arms HS are formed at their free ends carry the side clamps SK or side clamps 5 and telescopically adjustable in length are. The formwork 2 is of the three terminals 4, 5 in a semi-circular arc shape carried. For vertical support of the support arms 3 are obliquely from the lateral clamps 5 and the horizontal sliding arms HS up to the head area the support strut 1 extending Verstellketten or Verstellstreben V provided. In solid lines, a semicircular arc with a large span is shown. Dash-dotted is the setting of the shuttering device for a semicircular arc shown with smaller span. In both settings, the side Clamps 5 are always held at right angles to the support strut 1. For longitudinal guidance of Retaining arms 3 along the support strut 1, a slot guide S in the support strut. 1 be provided.

In the embodiment of the formwork device according to FIG. 10, the retaining arms are 3 on the vertical central support strut 1 two diagonally downwardly directed sliding arms SA, the telescopic length adjustable and symmetrical to the support strut 1 are. The support arms 3 are attached to the tip of the support strut 1 at this and wear at their ends the lateral clamps 5 and the formwork clamps SK. she are relative to each other or to the support strut 1 by a horizontal strut St supported. In solid lines is an adjustment of the shuttering device shown for a semicircular arc large span of the formwork skin 2. by broken is a setting for a semi-circular arc of the formwork with a smaller span shown, wherein in both settings, the lateral terminals 5 always correct angle to the support strut 1 are. At the top of the support strut 1, the terminal 4 is provided.

In the embodiment of the formwork device according to FIG. 11, the two Support arms 3 on the vertical central support strut 1 of the lower and upper cross struts 6, 7 respectively formed, which cross each other like a scissor and hinged together are. The inner ends of the lower transverse struts 6 are hinged to the flange 10, belonging to a sliding bearing VS on the support strut 1. The inner ones Ends of the upper cross struts 7 are also on a sliding bearing on the Support strut 1 hinged. The outer ends of the upper and lower crossbars 6, 7 are hingedly connected to an approximately parallel to the support strut 1, elongated Guide part FT, which at the point of articulation of the upper cross member 7 is a vertical Slot guide SL, in which the articulation point at Näähem the guide parts FT can slide down to the support strut 1 (see Fig. 11). At every guide part FT is the lateral clamp 5 or the formwork clamp SK always at right angles to Support strut 1 held.

In solid lines, the shuttering device is set for a semicircular arc the formwork 2 with a large span. Dashed is a setting of a Semicircular arc shown with smaller span.

In the embodiment of the formwork device according to FIG. 12, the retaining arms 3 on both sides of the vertical middle support strut 1 each of the lower and upper transverse struts 6, 7 are formed, which form an open main parallelogram and with their outer ends are pivotally connected to each other. In the common Connecting portion of the upper and lower cross braces 6, 7 is a smaller one Guiding parallelogram F provided, which comprises two auxiliary struts, which in each case a transverse strut 6, 7 articulated and pivotally connected to each other. The inner ones Ends of the lower transverse struts 6 are on the flange 10 and a sliding bearing hinged on the support strut 1. The inner ends of the upper cross struts 7 are hinged together at a pivot point on the support strut 1. In the common pivotal connection of the upper and lower crossbars 6, 7 is with respect to the vertical support strut 1 in approximately horizontal, elongated support member attached, which extends through the guide parallelogram and a linear guide for the junction of the two auxiliary struts. On the support part is attached to the side clamp 5 vertical sliding tube V, S and optionally attached additionally supported by a diagonal strut against the support member, which carries the lateral clamp 5 or the skin clamp SK and in all settings is always held angle to the support strut 1.

In solid lines, the shuttering device for a semicircular arc of in the formwork skin 2 fixed to the tip of the support strut 1 in the clamp 4, wherein the vertical sliding tubes VS have their shortest length. by broken is indicated that the same drawn drawn span by pulling out the vertical sliding tubes VS are turned up a basket arch can. Femer is indicated by dash-dotted lines that by a flatter setting of open parallelogram of the lower and upper cross struts 6, 7 a semicircular arc can be turned on with a smaller span, the vertical sliding tubes are pulled out accordingly.

In the previous embodiments, the lateral clamps 5 are adjustable Supporting devices, which together with the formwork clamp 4, the arch construction form. The support arms 3 are attached to the vertical support strut 1. At each support arm 3, a formwork clamp 5 is mounted rotatably or fixedly mounted.

The embodiment of the formwork apparatus of Fig. 13 substantially corresponds of the embodiment shown in Fig. 1 with retaining arms 3, whose cross struts 6, 7 with the connecting elements or holding plates 8, 9 each have a parallelogram form. On the holding plates 9 support plates 16 are mounted for the lateral clamps 5. At the top of the vertical central support strut 1 is the upper Clamp 4, so that the formwork 2 of the three terminals 4, 5 above and each side is worn with the set bow shape. On the support strut 1 are two outwardly down arcuately extending arc struts mounted over a considerable part of its longitudinal extent have equal holes, the Interspaces with increasing distance from the attachment of the bow strut on the support strut 1 increase. Each sheet strut is on the holding plate. 9 overlapped by an approximately perpendicular to the support strut 1 lying bracket on which there is a body aligned with the holes. In this way, As shown in FIG. 13, the support arms 3 in their adjustment positions relative to the support strut 1 are set. The bow struts have a similar function as the adjustment chains or Verstellstreben V in Fig. 9.

Claims (28)

1. Framework assembly for constructing arch-spaced boundaries of wall recesses, having support devices (1, 4, 5) for an elastically deformable framework sheet (2, 2') including a central vertical support strut (1) and two pivotable holding arms (3) protruding sidewards from the support strut (1) characterised in that the holding arms (3) respectively are provided with a lower and an upper lateral strut (6, 7) which lateral struts together with connecting element (8, 9) at the strut ends form a respective parallelogram and which carry the framework sheet (2, 2') in coaction with the vertical support strut (1).
2. Framework assembly as in claim 1, characterised in that clamps (4, 5) are located at the free ends of the holding arms (3) and of the support strut (1), preferably at the uppermost end of the support strut (1), the clamps (4, 5) defining support devices for the framework sheet (2).
3. Framework assembly as in claim 1, characterised in that the clamps (5) are rotatably provided at the holding arms (3), preferably rotatable parallel to the pivoting plane of each parallelogram.
4. Framework assembly as in at least one of claims 2 or 3, characterised in that the clamps (4, 5) include U-shaped brackets (17, 18) which grip around the framework sheet (2).
5. Framework assembly as in at least one of the preceding claims, characterised in that in the region of the clamps (5) at the holding arms (3) the framework sheet (2) is provided with at least one scale (31).
6. Framework assembly as in claim 4, characterised in that inwardly directed hooks (19, 20) are formed at side legs of the brackets (17, 18), and that tensioning means (25, 26) can be hung into the hooks, which tensioning means (25, 26) are provided within the brackets (17, 18).
7. Framework assembly as in claim 3, characterised in that the clamps (5) are provided on carrier plates (16) which can be rotated at the connecting elements (9) about a respective horizontal axis.
8. Framework assembly as in at least one of claims 1 to 7, characterised in that a holding plate (8) is fixed at the vertical support strut (1) as a connecting element for the ends of the lower and the upper lateral struts (6, 7), and that the holding plate (8) has a circle arch-shaped guide (14) for the lower lateral strut (6) of the holding arm (3).
9. Framework assembly as in at least one of claims 1 to 8, characterised in that the clamp (4) provided at the uppermost end of the support strut (1) includes two holding parts (28) for the, preferably, subdivided framework sheet (2'), which holding parts (28) are supported like a hinge in a joint (29) at the support strut (1).
10. Framework assembly as in claim 1, characterised in that the support strut (1) is telescopically adjustable.
11. Framework assembly as in at least one of the preceding claims, characterised in that during a pivotable adjustment of the holding arms (3) the clamps (5) permanently are maintained with the angle in relation to the vertical support strut (1).
12. Framework assembly as in at least one of the preceding claims, characterised in that the lower and the upper lateral struts (6, 7) of the parallelograms of the holding arms (3) can be shifted parallel to determine the radius of all kinds of arches, preferably by pivoting the holding arms (3).
13. Framework assembly as in at least one of the preceding claims, characterised in that, additionally, one lateral strut (6, 7) is slidably provided in relation to the other lateral strut (4) differing inclinations and different kinds of arcs, preferably, that the lower lateral strut is slidable relative to the upper lateral strut.
14. Framework assembly as in at least one of the preceding claims, characterised in that differing framework sheet clamps (4, 5) are provided for the same framework assembly intended for differing inclinations and/or different sorts of arches.
15. Framework assembly as in at least one of the preceding claims, characterised in that arch span widths between approximately 60 cm and 1.6 m can be produced with the framework assembly.
16. Framework assembly as in at least one of the preceding claims, characterised in that the support strut (1) is a conventional steel support strut as is conventionally used on construction sites.
17. Framework assembly as in at least one of the preceding claims, characterised in that the framework sheet (2, 2') is elastic but has an internal strength sufficient to carry the load of site-mixed concrete or of the wall structure and, preferably, is made from PVC, plastic materials, steel or wood.
18. Framework assembly as in at least one of the preceding claims, characterised in that, preferably the framework sheet (2) is held at the top end of the vertical support strut (1) and at the free ends of the holding arms, preferably by a respective framework-sheet-clamp (4, 5) and optionally at the top end of the support strut (1) by a fixed connection between the framework sheet (2) and the support strut (1).
19. Framework assembly as in at least one of the preceding claims, characterised in that the joint elements of the parallelogram of each holding arm (3) are defined by holding plates (8, 9), that the innermost holding plates (8) are secured to the vertical support strut (1), preferably by means of a flange (10) and of a tensioning clamp (11), that each upper lateral strut (7) is linked by a bolt (12) in the innermost holding plate (8) and by an axis (15) at the outermost holding plate (9), and that each lower lateral strut (6) is linked by a pivot (13) in a guide (14) of the innermost holding plate (8) and by and axis (15) to the outermost holding plate (9).
20. Framework assembly as in at least one of the preceding claims, characterised in that tensioning parts (21, 22) engage at the side legs of the brackets, and that the tensioning parts (22) of the clamp (5) are formed by a clamping beam (23) and a clamping screw (24), which clamping screw (24) is rotatable in order to move the clamping beam (23) for clamping or releasing the framework sheet (2).
21. Framework assembly as in at least one of the preceding claims, characterised in that tensioning parts (21, 22) engage at the side legs of the brackets (17, 18), and that the tensioning (21) of the clamp (4) are formed by pivotable levers (25), which levers (25) are pivotable by means of screw supported retainers (27) for clamping or releasing the framework sheet (2).
22. Framework assembly for constructing arch-shaped boundaries of wall recesses, having support devices (1, 4, 5) for an elastically deformable framework sheet (2), and having a central vertical support strut (1) and two pivotable holding arms (3) sidewardly protruding on both sides from the support strut (1), the support devices carrying the elastically deformable framework sheet (2) together with the support strut (1), characterised in that the holding arms (3) have a respective upper and a lower lateral strut (6, 7), of which the lateral struts (6, 7) of each holding arm (3) are interconnected at their outer ends and are pivotably connected at their inner ends at an upper and lower, displaceable, joining point with the support strut (1) for forming an open main parallelogram inside of which an incorporated smaller guiding parallelogram (F) is provided at the pivotal connection of the lateral strut (6, 7) for guiding a framework-sheet-clamp (5) provided at the free end of the holding arm (3) in a predetermined angular position in relation to the support strut (1).
23. Framework assembly as in claim 22, characterised in that the smaller guiding parallelogram (F) includes the outer ends of the upper and the lower lateral struts (6, 7) and two auxiliary struts respectively linked to a respective lateral strut, the auxiliary struts having a common joint location, and that in the pivotal connection of the upper and lower lateral struts (6, 7) a longitudinal carrier part is provided which extends substantially horizontally relative to the vertical support strut (1), that the carrier part has a linear guide for the joint of the auxiliary struts, and that the carrier part carries a vertical sliding tube (VS) which is adjustable in its length and carries the clamp (4).
24. Framework assembly for constructing arch-shaped boundaries of wall recesses, including support devices (1, 4, 5) for an elastically deformable framework sheet (2), and a central vertical support strut (1) and two pivotable holding arms (3) protruding from the vertical support strut (1) sidewardly at both sides, which holding arms carry the framework sheet (2) together with the vertical support strut (1), characterised in that the holding arms (3) have respective lower and an upper lateral strut (6, 7), of which the upper and lower lateral struts (6,7) of each holding arm (3) are pivotally linked at their ends (2), two shiftable bearings provided at their support strut (1), that the lateral struts (6, 7) cross each other scissors-like in a joint, that the lateral struts are pivotally connected at the outer ends to a carrier of a sidewardly located clamp (5) for the framework sheet (2), the carrier extending substantially parallel to the support strut (1), the carrier including a slit guide (SL) extending substantially parallel to the support strut (1), the slit guide (SL) serving to receive a connection between a lateral strut and the carrier.
25. Framework assembly for constructing arch-shaped boundaries of wall recesses, including support devices (1, 4, 5) for an elastically deformable framework sheet (2), the support devices including a central vertical support strut (1) and two holding arms (3) symmetrically protruding from both sides of the support strut (1), the holding arms (3) carrying the framework sheet (2) together with the support strut (1), characterised in that the holding arms (3) comprise a respective slide arm (SA) carrying a clamp (5) for the framework sheet (2) at the free slide arm end and being supported by a strut (ST) which extends substantially horizontal relative to the vertical support strut (1), each slide arm (SA) being of adjustable length and extending obliquely downwardly from a fixation at the support strut (1).
26. Framework assembly for constructing arch-shaped boundaries of wall recesses, comprising support devices (1, 4, 5) for an elastically deformable framework sheet (2), the supporting devices including a central vertical support strut (1) and two holding arms (3) protruding sidewardly from both sides of the support strut (1), the holding arms and the vertical support strut carrying the framework sheet (2), the holding arms being formed by a horizontal slide arm (HS) or by two aligned horizontal-slide arms (HS) and being slidably guided along the support strut (1), the horizontal-slide arm or both horizontal-slide arms, respectively, being telescopically and longitudinally adjustable, carry at the free ends clamps (5) for the framework sheet (2) and being supported by adjustment chains or adjustment struts (V) extending obliquely upwardly to the support strut (1), characterised in that the support strut (1) includes at least one slit guide (S) for the horizontal slide arm or for both horizontal slide arms (HS), respectively.
27. Framework assembly as in claim 1, characterised in that two arch-shaped struts are provided symmetrically at the support strut (1) such that they extend outwardly and downwardly, and that the framework sheet (2) is fixed to the arch-shaped struts relative to the support strut (1) or the upper clamp (4), respectively, by the holding arms (3) carrying the clamps (5) and in the selected arch-shaped and span widths.
28. Framework assembly as in claim 27, characterised in that both arch-shaped struts are pivotally linked to the support strut (1), that each arch-shaped strut extends from its link location arch-shaped and obliquely and downwardly over the associated holding arm (3), such that the concave archside faces the support strut (1), that each arch-shaped comprises bores in a bore array extending along the main part of the longitudinal extension of the arch-shaped strut, the interspaces of the bores increasing with increasing distance from the link location, and that each arch-shaped strut is gripped by a bracket provided in the region of the free end of the holding arm (3), and that the bracket has a body aligned with the bores.

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