Apparatus for forming / detaching strut for concrete floor casting

Abstract

A device (10) for forming / detaching a strut for a concrete floor casting, comprising, in the following order along its extension axis (X):-a first plate (11), which is annular and fixed relative to the extension axis (X), and which has a plurality of first protrusions (12) directed towards a second plate (13); -a second plate (13) which can be rotated and / or translated in a plane perpendicular to the extension axis (X) and substantially parallel to the first plate (11), and which has a plurality of second projections (14) which are directed towards the first plate (11) and which are shaped at least partially complementary to the first projections (12), the second plate (13) having a plurality of third projections (15) which are directed towards the third plate (16); -a third plate (16), which is annular and is fixed with respect to the extension axis (X) and is substantially parallel to the first plate (11), and which has a plurality of fourth projections (17), which are directed towards the second plate (13) and are shaped at least partially complementary to the third projections (15).

Description

[0001] The present invention relates to an apparatus for forming / stripping struts for casting of concrete floor slabs.

[0002] Today, for concrete floor castings, formwork units are used which are supported by beams resting on a number of pillars.

[0003] A prop is a telescopic device used in a vertical configuration, comprising an outer first tubular body within which a second tubular body is slidable, the second tubular body terminating in a plate for connection to beams and / or formwork.

[0004] The first tubular body has an external thread at an upper end thereof, and two opposing and parallel grooves extending longitudinally along the thread.

[0005] The second tubular body has two rows of opposite and parallel through holes along its extension direction, each through hole being adapted to correspond to a corresponding slot in the first tubular body for inserting a transverse pin to lock the overall length of the strut to a desired size.

[0006] During use, the pillars are formed into a supporting formwork.

[0007] To this end, a ring nut is screwed onto the thread of the first body so that the second tubular body is clamped to the first tubular body at the desired length by the interference between the ring nut and the pin. The pin passes through the slot of the first tubular body and two opposite holes of the second tubular body, and it interferes in turn with the upper edge of the slot of the first tubular body and the edge of the corresponding hole of the second tubular body.

[0008] After pouring the concrete, and once the concrete has hardened, the struts are disassembled so that they can be removed by unscrewing the ring nuts in order to lower the second tubular body by sliding it inside the first tubular body.

[0009] Such known techniques have a number of disadvantages.

[0010] In fact, after pouring the liquid concrete, which does not yet have any supporting capacity, the pillars bear all the weight of the concrete block, transferring it to the ground.

[0011] After a few days, the concrete has hardened sufficiently (although not completely) and the pillars can be untied and removed. However, at the same time, the concrete is not yet completely hardened and rigid, and therefore the pillars are still trapped and compressed between the two consecutive floor slabs.

[0012] Therefore, in order to be able to dismantle and remove the strut, it is necessary to act on the ring nut by striking it with a hammer with a greater or lesser degree of force depending on the compression to which the strut is subjected.

[0013] This results in the operation of disassembling the support column being complicated, difficult and inconvenient.

[0014] Furthermore, over time, hammering on the ring nut and compression of the strut during disassembly causes its degradation, drastically shortening its operating life.

[0015] The object of the present invention is to provide an apparatus for forming / disassembling pillars for concrete floor castings which improves the known art in one or more of the above-mentioned aspects.

[0016] Within this aim, an object of the present invention is to provide an apparatus for forming / dismantling pillars for concrete floor castings which makes the operations of forming / dismantling the pillars easier, faster and less difficult than similar conventional apparatuses.

[0017] Another object of the present invention is to provide an apparatus for forming / tearing posts for concrete floor castings which also provides a longer operating life for the posts to which it is applied than similar conventional apparatus and posts.

[0018] A further object of the invention is to overcome the disadvantages of the known art in a manner which can replace any existing solutions.

[0019] Another object of the present invention is to provide an apparatus for forming / dismantling pillars for concrete floor castings which is highly reliable, easy to implement and low-cost.

[0020] This object, as well as these and other purposes which will become more apparent hereinafter, is achieved by a device for forming / disassembling pillars for concrete floor castings, characterized in that the device comprises, along its axis of extension, in the following order: - a first plate, which is annular and fixed relative to the extension axis and which has a plurality of first protrusions directed towards the second plate, - the second plate is rotatable and / or translatable in a plane perpendicular to the extension axis and substantially parallel to the first plate, and has a plurality of second protrusions directed toward the first plate and at least partially shaped complementarily to the first protrusions, and has a plurality of third protrusions directed toward the third plate, - the third plate being annular and fixed relative to the extension axis and substantially parallel to the first plate and having a plurality of fourth protrusions directed towards the second plate and at least partially shaped complementarily to the third protrusions.

[0021] Further features and advantages of the invention will become more apparent from the following detailed description of a preferred but non-exclusive embodiment of an apparatus for forming / disassembling a support for a concrete floor casting according to the invention, which is illustrated for the purpose of non-limiting example in the accompanying drawings, in which: Figure 1 is an overall perspective view of an apparatus for forming / disassembling a support for a concrete floor casting according to the present invention in a formed configuration; Figure 2 yes Figure 1 An overall perspective view of an apparatus for forming / disassembling a support for a concrete floor casting in a disassembled configuration; Figure 3 yes Figure 1 A cross-sectional side view of an apparatus for forming / disassembling a support for a concrete floor casting, Figure 1 The same configuration; Figure 4 and Figure 5 yes Figure 1 Two different exploded views of an apparatus for forming / disassembling a support column for a concrete floor casting; Figure 6 yes Figure 1 A partial side view of a component of the device; Figure 7 It is along Figure 6 The line VII-VII intercepts Figure 6 A partial cross-sectional view of a component.

[0022] Referring to the drawings, an apparatus for forming / disassembling a support column for a concrete floor casting according to the present invention is generally indicated by the reference numeral 10 .

[0023] The device 10 comprises, along its axis of extension X, in the following order: a first plate 11 , which is annular and fixed relative to the axis of extension X and which has a plurality of first protrusions 12 oriented towards the second plate 13 , a second plate 13 rotatable about an axis of extension X and parallel to the first plate 11 , having a plurality of second protrusions 14 directed toward the first plate 11 and shaped at least partially complementary to the first protrusions 12 , and having a plurality of third protrusions 15 directed toward the third plate 16 , A third plate 16 , which is annular and fixed relative to the axis of extension X and substantially parallel to the first plate 11 , and has a plurality of fourth protrusions 17 directed towards the second plate 13 and shaped at least partially complementarily to the third protrusions 15 .

[0024] In a variant of embodiment not shown in the figures, the second plate 13 can be rotated and / or translated in a plane perpendicular to the axis X of extension.

[0025] Advantageously, the second plate 13 has: A portion 22 having a substantially annular contour at a region including the second protrusion 14 and the third protrusion 15, A handle 23 extends radially from the portion 22 and is in one piece with the portion 22 .

[0026] In particular, the first plate 11 is integral with a flange 18 extending at the upper end of a first tubular body 19 which has at its lower end a base 20 for resting on the ground.

[0027] In this specification, the expressions “upper”, “lower”, etc. refer to configurations for use of the device 10 .

[0028] The first tubular body 19 has an axis of extension coinciding with the axis of extension X of the device 10 .

[0029] The second tubular body 21 extends from the flange 18 and has a diameter smaller than that of the first tubular body 19 and is coaxial with the first tubular body 19 .

[0030] The second tubular body 21 extends from a surface of the flange 18 opposite to the surface directed toward the first tubular body 19 .

[0031] The second tubular body 21 passes through the first plate 11 and the second plate 13 .

[0032] The device 10 comprises means 24 for automatically forming the device 10 .

[0033] These means 24 for automatically forming the device 10 include a helical spring which: - is arranged in the hole 25 of the first plate 11 and surrounds the second tubular body 21, - between the flange 18 and the second plate 13 .

[0034] The second tubular body 21 has an inlet 27 with a square inner profile.

[0035] The third plate 16 is integral with a flat bracket 26 for anchoring to a support column not shown in the figure.

[0036] The support 26 is arranged at the end of the device 10 opposite to the base 20 .

[0037] The third tubular body 28 extends from the bracket 26 and has a square cross-section that is complementarily shaped to the inlet 27 of the second tubular body 21 into which the third tubular body 28 is inserted.

[0038] The third tubular body 28 passes through in the following order: - third plate 16, - a second tubular body 21, - flange 18, - at least a portion of the first tubular body 19 .

[0039] The third tubular body 28 has two parallel slots 29 (only one visible in the drawing) corresponding to the two through holes 30 (only one visible in the drawing) in the first tubular body 19 .

[0040] In particular, these through holes 30 are interposed between the base 20 and the flange 18 .

[0041] The pins / screws 31 of the bolts are inserted into the grooves 29 and the through holes 30 .

[0042] The pin / screw 31 is designed to prevent the third plate 16 from being withdrawn and separated from the second plate 13 and from the first plate 11 .

[0043] Specifically, the slot 29 allows the third tubular body 28 to slide during formation / disassembly, but the third tubular body 28 will not come out of the first tubular body 19 due to the presence of the pin / screw 31 passing through the slot 29 and also through the through hole 30 .

[0044] The inverted cup-shaped body 32 extends from the support 26 in the direction of the first tubular body 19 and with the same axis of extension X.

[0045] This inverted cup-shaped body 32 has a diameter greater than that of the first tubular body 19 and is in one piece with the support 26 corresponding to the bottom of the cup.

[0046] The inverted cup-shaped body 32 has a transverse opening 33 for the handle 23 to slide during formation / disassembly.

[0047] The lateral ends 34 a , 34 b of the opening 33 define the sliding limits of the handle 23 .

[0048] In particular, the second and third protrusions 14 and 15 each have a surface 14a, 15a for contacting the first and third plates 11, 16, respectively, in the formed configuration, which has an angle of circumferential inclination k of about 2° relative to a plane parallel to the arrangement plane of the handle 23.

[0049] This inclination facilitates the disassembly of the device.

[0050] Furthermore, in a variation of the embodiment, Figure 7 As shown, the second protrusion 14 and the third protrusion 15 each have a surface 14a, 15a for contacting the first plate 11 and the third plate 16 respectively in the formed configuration, and the surfaces 14a, 15a have a radial inclination angle z relative to a plane parallel to the arrangement plane of the handle 23.

[0051] This inclination facilitates the rotation of the second plate 13 .

[0052] The use of the device 10 according to the invention is as follows.

[0053] Device 10: - fixed at its bracket 26 to a support not shown in the figure, - Placed on the ground at its base 20 .

[0054] exist Figure 1 , Figure 3 and Figure 6 In the formation configuration shown: - the second protrusion 14 of the second plate 13 is arranged at the first protrusion 12 of the first plate 11, The third protrusion 15 of the second plate 13 is arranged at the fourth protrusion 17 of the third plate 16 .

[0055] In order to dismantle the device 10 and be able to remove the support from under the floor casting in concrete, it is sufficient to rotate the second plate 13 by acting on the handle 23 so that each second protrusion 14 is located between two consecutive first protrusions 12 and each third protrusion 15 is located between two consecutive fourth protrusions 17.

[0056] In this way, the third plate 16 is close to the first plate 11 and this creates enough space to remove the pillars from under the concrete cast.

[0057] As soon as the support is removed from the concrete cast, the device 10 is automatically reformed by means of the elastic return of the spring 24 which pushes the second plate 13 in the direction of the third plate 16 so that: - the second protrusion 14 returns to the first protrusion 12 / above the first protrusion 12, The third protrusion 15 is returned to / under the fourth protrusion 17 .

[0058] Reshaping can also occur when the device is applied to a pillar associated with a structure having multiple pillars and the pillar is shortened by translating the (telescopic) lower part of the pillar while the upper part remains in contact with the cast part.

[0059] In this case, reforming takes place as soon as a free space opens up between the (lower) first plate 11 and the second plate 13 .

[0060] In practice it has been found that the invention fully achieves the intended aim and objects by providing an apparatus for forming / disassembling pillars for concrete floor castings which makes the operations of forming / disassembling the pillars easier, faster and less difficult than similar conventional apparatuses.

[0061] The present invention provides an apparatus for forming / tearing a post for a concrete floor casting which also provides a longer operating life for the post to which the apparatus is applied than similar conventional apparatus and posts.

[0062] The invention thus conceived is susceptible of numerous modifications and variations, all of which are within the scope of the appended claims. Furthermore, all the details may be replaced by other, technically equivalent elements.

[0063] In practice, the materials employed (provided they are compatible with the specific use) and the dimensions and shapes which vary from case to case may be any, according to requirements and the state of the art.

[0064] The disclosures in Italian Patent Application No. 102022000014599 from which this application claims priority are incorporated herein by reference.

[0065] In case technical features mentioned in any claim are followed by reference signs, such reference signs are inserted for the sole purpose of increasing the intelligibility of the claim and therefore do not have any limiting effect on the interpretation of each element represented by such reference signs by way of example.

Claims

1. A device (10) for forming / disassembling pillars for concrete floor castings, characterized in that The device comprises, in the following order along its axis of extension (X): - a first plate (11) which is annular and fixed relative to said axis of extension (X) and which has a plurality of first protrusions (12) directed towards the second plate (13), - the second plate (13) being rotatable and / or translatable in a plane perpendicular to the extension axis (X) and substantially parallel to the first plate (11), and having a plurality of second protrusions (14) directed towards the first plate (11) and at least partially shaped complementary to the first protrusions (12), the second plate (13) having a plurality of third protrusions (15) directed towards the third plate (16), - the third plate (16) being annular and fixed relative to the extension axis (X) and being substantially parallel to the first plate (11), and having a plurality of fourth protrusions (17) directed towards the second plate (13) and being at least partially shaped complementarily to the third protrusions (15).

2. The device (10) according to claim 1, characterized in that The second plate (13) has: - a portion (22) having a substantially annular profile at a region comprising said second protrusion (14) and said third protrusion (15), - a handle (23) extending radially from the portion (22) and being in one piece with the portion (22).

3. The device (10) according to claim 1, characterized in that The first plate (11) is integral with a flange (18) extending at the upper end of a first tubular body (19), the first tubular body (19) having a ground resting base (20) at its lower end, the first tubular body (19) having an extension axis coinciding with the extension axis (X) of the device (10).

4. The device (10) according to any one of the preceding claims, characterized in that A second tubular body (21) extends from the flange (18) and has a diameter smaller than that of the first tubular body (19) and is coaxial with the first tubular body (19), the second tubular body (21) extending from a surface of the flange (18) opposite to a surface facing the first tubular body (19), the second tubular body (21) passing through the first plate (11) and the second plate (13).

5. The device (10) according to any one of the preceding claims, characterized in that The device (10) comprises means (24) for automatically forming the device (10).

6. The device (10) according to claim 5, characterized in that The means (24) for automatically forming the device (10) comprises a helical spring, the helical spring: - arranged in the hole (25) of the first plate (11) and surrounding the second tubular body (21), - between said flange (18) and said second plate (13).

7. The device (10) according to any one of the preceding claims, characterized in that The third plate (16) is integral with a flat support (26) which is arranged at the end of the device (10) opposite to the base (20).

8. The device (10) according to claim 7, characterized in that The third tubular body (28) extends from the bracket (26) and has a square cross section which is shaped complementarily to the inlet (27) of the second tubular body (21) into which the third tubular body (28) is inserted, and the third tubular body (28) passes in the following order: - the third plate (16), - the second tubular body (21), - the flange (18), - at least part of said first tubular body (19).

9. The device (10) according to any one of the preceding claims, characterized in that The third tubular body (28) is provided with two parallel grooves (29), the grooves (29) corresponding to the two through holes (30) of the first tubular body (19), the through holes (30) being between the base (20) and the flange (18), and the pin / screw (31) of the bolt is inserted into the grooves (29) and the through holes (30).

10. The device (10) according to any one of the preceding claims, characterized in that An inverted cup-shaped body (32) extends from the support (26) in the direction of the first tubular body (19) and with the same extension axis (X), the inverted cup-shaped body (32) having a diameter greater than the diameter of the first tubular body (19) and being in one piece with the support (26) corresponding to the bottom of the cup, the inverted cup-shaped body (32) having a transverse opening (33) for the handle (23) to slide during formation / disassembly, the transverse ends (34a, 34b) of the opening (33) defining the sliding limits of the handle (23).

11. The device (10) according to any one of the preceding claims, characterized in that The second protrusion (14) and the third protrusion (15) each have a surface (14a, 15a) for contacting the first plate (11) and the third plate (16) respectively in a formed configuration, and the surfaces (14a, 15a) have a circumferential inclination angle (k) relative to a plane parallel to the arrangement plane of the handle (23).

12. The device (10) according to any one of the preceding claims, characterized in that The second protrusion (14) and the third protrusion (15) each have a surface (14a, 15a) for contacting the first plate (11) and the third plate (16) respectively in a formed configuration, and the surfaces (14a, 15a) have a radial inclination angle (z) relative to a plane parallel to the arrangement plane of the handle (23).

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