EP2455563B1 - Method for attachment of a headpiece to the front of a construction support - Google Patents

Description

The invention relates to a method for frontally placing a headrest on a prop.

Brackets or vertical tubes, in particular height-adjustable so-called "telescopic vertical tubes" are used for setting up slab formwork, shoring or scaffolding. Vertical tubes are z. As for formwork, as scaffolding tube as part of a so-called modular scaffolding (spatial structure) or as part of a vertical frame used in facade scaffolding. Regardless of the purpose, these can be height adjustable. In scaffolding, it is often necessary to adapt the individual vertical tubes or vertical frames formed therewith to the course of the substrate, for example to an inclined floor or steps. For slab formwork, the props must occupy a predetermined defined height. Therefore, the telescopic vertical tubes on an outer tube and an inner tube which is displaceable and fixable for length and height adjustment in the outer tube and thus telescopic. This height adjustment can be done by moving the inner tube in stages or continuously, for example by inserted in through holes pin or thread.

Propellers have to increase the footprint on the front side of a head or foot plate at one or both free ends. This serves to increase the footprint, so that a lower contact pressure against the counter surface, for example, a floor, a ceiling or a wall results. Without a foot plate, the vertical tube would possibly press into the ground or it could result in setting movements under load. The top plate can directly carry a load and / or be connected to this example by screws, nails.

But the top plate can also be a so-called head piece, z. B. drop head or clevis wear. This allows a certain load application of a load, eg. B. formwork, in the prop. The headrest is placed on top of the headrest on the top, the head piece above a specially shaped connection device for supporting the overhead load and below a downwardly extending inner tube for insertion into the tube of the prop. Optionally, the head piece is located on suitable surfaces on the top plate, so that the vertical loads are introduced into the prop via the top plate. Because of the construction site-typical environmental conditions is always with pebbles, buildup, sand, etc, to be expected, which is why the connection headstock prop is very playful. It follows that the connection is not well defined, e.g. B., the inner tube may be obliquely or eccentrically to the prop tube. The load transfer is therefore undefined and the calculated static of the prop is no longer valid. Therefore, such a connection must be oversized, so unnecessarily expensive to be interpreted.

Although there are fixatives, z. B. plugged through aligned through holes pin known. This should only prevent falling out of the head piece. But the headpiece has play in the X, Y and Z directions. Thus, the fixing means connect positively, but for the reasons mentioned above, the inner tube of the headrest in the pipe of the prop. The load introduction remains undefined.

It is also known for the defined load introduction to screw the headrest with the top plate, but this is very laborious, especially under dirty construction site conditions.

DE 12 47 969 B discloses a header comprising an above connection device, below a downwardly extending inner tube; on the head piece fixing means and on the head piece clamping means

DE 12 47 969 B discloses the preamble of claim 1. It is therefore an object of the present invention to provide a method with an improved head piece for frontal placement on a prop.

This object is achieved by a method for frontally placing a head piece on a prop in accordance with claim 1.

Advantageous embodiments are the subject of the dependent claims.

The method according to the invention comprises a head piece for frontal placement on a prop with a pipe, the head piece at the top comprising a connection device for supporting an overhead load. This is a kind of transition piece, which to the respective load, for. B. formwork beams or stringers adapted. Below the connection device extends down an inner tube for insertion into the tube of the telescopic prop. This allows insertion of the header in the upper part of the prop. The inner tube can also be made very long as alignment aid, so that an inclination is prevented. Furthermore, fixing means, for. B. in the form of a through hole in the inner tube of the head piece, provided for the positive play-related connection of the inner tube in the pipe of the prop. Together with e.g. a bolt can thus be effected a fixation. The fixation can also be done via circumferential grooves in the inner tube or the like. This combination of features is known from the prior art and the fixation creates only a play-afflicted connection with undefined load introduction. An inner tube is here to be understood functionally: It serves to center and at least partially fix the head piece in some directions. It can therefore also another geometry, for. B. rectangular profile or octagonal profile or be a solid solid profile.

In an advantageous embodiment of the method, this defined load introduction can be effected simply by the fact that the clamping means are provided for play-free pretensioning of the connected by means of the fixing headpiece and prop on the head piece. As a result, the play-afflicted connection under a bias, ie an internal stress, the regardless of external loads in the system head piece-Baustüte is present. Clamping means are all measures by which a biasing can be effected, for. B. threads or wedges, wedges could z. B. from the side between the top plate and a corresponding counter surface are driven on the head piece. The biasing can be done both by pulling apart the components (pressure on fixation), as described in the embodiment, as well as by compression (train on fixation). For reasons of load, pulling apart is preferred. The inner tube can now be shorter; Nevertheless, an inclination is prevented.

From the prior art, such as. In FIG. 2b explained, telescoping props are known in which the height adjustment initially a coarse adjustment of the length can be done in stages by inserted into aligned through holes through the inner and outer tube pins. This is a coarse adjustment. For fine adjustment, a stepless adjustment by means of thread is provided. Until now, the skilled person knew a thread only for length adjustment but not for pre-tensioning, even though the thread and bolt connections have been available on the props for about 50 years.

Preferably, a threaded nut is provided as a clamping means, which is screwed along the at least partially formed as a threaded spindle inner tube in its axial direction. The structure is simple, especially since construction site suitable threaded spindles and nuts are available in a standardized manner. In this case, threaded nut, threaded spindle and the fixing means are designed and arranged in such a way that the biasing is possible.

Preferably, the threaded nut has a lower plate which extends in a plane perpendicular to the longitudinal axis of the inner tube, which serves as an abutment for the top plate. A defined placement is facilitated if the lower plate has defined contact surfaces or webs for seating on the top plate, this may in particular be circumferential, possibly only partially circumferential, downwardly facing annular land. The threaded nut preferably has gripping pieces pointing away from the longitudinal axis, which are such that pretensioning without tools is possible. The handling is facilitated and there is no tool must be kept.

Preferably, a through hole in the inner tube is provided as fixing means, which is designed and arranged such that it can be brought into alignment with a corresponding through hole in the pipe of the prop when inserting the Koptstückes in the tube. The simple measures allow a playful fixation and used in construction proven connection techniques.

Preferably, a guide, for. Example, extending in the axial direction tongue and groove geometry, which requires a certain orientation of the inner tube relative to the tube during insertion of the inner tube into the tube. It is an anti-twist device to ensure that the through holes are aligned without manual turning.

Preferably, the connecting device is formed on the head piece such that supports, profiles or receiving parts for system components can be attached thereto or fastened in order to allow a rapid assembly in a modular manner. The installation can be pure laying or fixing, z. B. by screwing, tying, etc ..

In a further embodiment of the method, a set is further provided with matched components, comprising the above-described head piece, the above-described, adapted thereto telescoping prop with a through hole, which can be brought into alignment with the through hole in the inner tube and a bolt passing through the aligned through holes under game for fixation is insertable. To facilitate the handling on construction sites with sufficient function, the connected components are preferably displaceable in the axial direction, in particular by 1-5 mm, preferably 2-4 mm. For the same purpose, the following values are preferable proposed: The outer diameter of the inner tube is 25 - 99 mm; the inner diameter of the tube is 30-100 mm and / or the difference between the outer diameter of the inner tube and the inner diameter of the tube is 1-5 mm, preferably 2-4 mm.

Preferably, the telescoping prop is designed as a telescopic vertical tube, formed with a frontal head and / or foot plate at one or both free ends, the head and / or foot plate a footprint for supporting the prop against opposing surfaces, in particular a floor,

Ceiling or wall, has. These components are available and proven in large numbers and variations. It can therefore be used to implement the invention on standard components. All you have to do is adapt the head piece to it.

In this case, if appropriate, the top plate of the prop can be designed as an abutment for the threaded nut during pretensioning.

A telescoping vertical tube preferably has an outer tube and an inner tube displaceable therein for length or height adjustment, wherein the inner tube is in different positions in stages and / or continuously displaceable and fixable and thus telescopic. This height adjustment can be done by moving the inner tube in stages, for example by pins inserted in through-holes. The height adjustment and fixation can also be made continuously, for example, characterized in that the inner tube has an external thread, which is screwed into a corresponding mating thread or nut, wherein the mating thread or the nut is supported against the outer tube. The inner tube may therefore be loosely inserted into the vertical tube and associated with other components, such as a thread root plate. A vertical tube can also be installed horizontally, z. B. between walls or scarf walls, which also falls under the spirit of the invention. Any prop, in particular a telescopic, here falls under the term "vertical tube", It can be the above-mentioned "tube" the prop is formed by the outer or inner tube. The support can also be set up in reverse.

If a spindle is used as an inner tube, this may possibly only be inserted sufficiently deep into the outer tube sufficiently deep, so that the vertical tube can absorb only compressive forces in the axial direction. The compressive forces are absorbed by a screwed onto the spindle nut or more generally a mating thread, which in turn is supported against the opening of the outer tube or generally against the outer tube. Furthermore, the spindle and nut should be designed so that even with the maximum unscrewing of the spindle, this is performed adequately in the outer tube. The nut preferably has wings for turning without tools. The spindle can be inserted at the upper or lower end of the vertical tube and thus form a head or foot spindle. Such spindles preferably comprise a head or foot plate, a threaded tube and a spindle nut. These threaded spindles are z. B. also plugged into modular scaffolding vertical handles or vertical tubes of a facade or supporting framework.

Preferably, the vertical tube is part of a scaffolding, z. B. as scaffolding tube or as the two vertical posts in a scaffolding frame. In a scaffolding frame, two parallel vertical tubes in the lower and upper regions of the outer tube are connected to each other by horizontal beams to form a frame. So-called modular scaffolds are preferably connected by means of prefabricated system components and have corresponding connection options. This may, for example, be a system with vertical stem stakes and wedge heads on the bars and diagonals for hanging in the plates. Alternatively, this may be a system with prefabricated frames that are connected and stiffened by means of bars and diagonals.

• Figur 1a-d: das Fixieren und Vorspannen des Kopfstückes auf einer Baustütze in der nach dem erfindungsgemäßen Verfahren; und
• Figur 2a, 2b: je ein teleskopierbares Vertikalrohr in perspektivischer Ansicht (ohne das aufgesetzte Kopfstück);
• Figuren 1a-d zeigen in dieser Reihenfolge das Einstecken, Positionieren, Fixieren und Vorspannen des Kopfstückes 5 auf einer Baustütze 1.

Further advantages will become apparent from the following description and the accompanying drawings. The mentioned embodiments are not exhaustive and have exemplary character. Showing:

• Figure 1a-d the fixing and biasing of the head piece on a prop in the method according to the invention; and
• Figure 2a, 2b : each a telescopic vertical tube in perspective view (without the attached head piece);
• FIGS. 1a-d show in this order the insertion, positioning, fixing and biasing of the head piece 5 on a prop 1.

Starting with FIG. 1a has the prop 1 a top open, accessible pipe 3 with a plate-like head plate 4. The head piece 5 has at the top a connecting device 52 shown only symbolically for supporting an overhead load. Extending downwardly therefrom is an inner tube 51 for insertion into the tube 3 of the prop 1. The inner tube 51 is present, but not mandatory, over its entire length with an external thread 53 and thus forms a threaded spindle. On this a threaded nut 7 is screwed, which can thus be screwed in the axial direction up and down. Handles 72 on the nut 7 facilitate manual turning. The lower edge of the nut is formed by a lower plate 71, which in the present case has a circumferential downwardly pointing web 74 for producing a defined contact surface with the head plate 4 of the prop 1. The inner tube 51 has a through hole 6 which can be brought into coincidence with a matching bore 61 in the prop 1. First, the inner tube 51 is inserted from above into the pipe 3 of the prop.

FIG. 1b shows the already patched head piece 5, which is manually held so that the two through holes 6, 61 are aligned. In this case, of course, the threaded nut 7 may have been deliberately rotated so that the lower plate 71 rests on the top plate 4. Optionally, even the nut 7 is still in the right position from the last use.

Then, as in Figure 1c shown, a bolt 8 through the aligned holes 6, 61 are inserted. In the present case, a "T-bolt" is shown with a retaining clip as captive, which can snap around the tube 3. Because of the intended game between bolt 8 and the holes 6,61 and between the inner tube 51 and tube 3 of the prop results in a mobility of the components to each other.

This allows for pretensioning of the components, as in Figure 1d shown, an optimal fit of the lower plate 71 of the nut 7 on the top plate 4 of the prop 1. The biasing is done by screwing down the nut 7 so that the lower plate 71 of the nut 7 is supported on the top plate 4. The grips 72 on the nut facilitate tool-free handling. In this case, a defined connection and thus defined introduction of force of the external loads of the head piece 5 in the prop 1 is realized by eliminating the vertical play.

The prop 1 is telescopic.

FIG. 2a shows in addition a telescopic vertical tube 1 with a circular outer tube 2 and a guided therein displaceable circular inner tube 3, which is designed here as a threaded spindle. The spindle 3 is thus inserted into the outer tube 2 and the height compensation can be infinitely variable, wherein the thread is supported by a correspondingly shaped counter-threaded piece in the form of a manually rotatable nut 21 at the head of the outer tube 2 against the same. The outer tube 2 thus carries the nut 21 with the spindle 3 screwed therein.

The spindle 3, which serves here only as an example of an inner tube of a telescopic vertical tube, has at its free - here upper end 31 a substantially square top plate 4 - here with rounded corners. The same applies to the lower free end 41 of outer tube 2, the prop 1 can also be reversed around, z. B. be installed as a scaffold on uneven ground.

FIG. 2b shows another embodiment of the prop 1, which only in the mounting principle 21 of Fig. 1a different. This height adjustment can be done by moving the inner tube in stages by pins inserted into aligned through holes through the inner and outer tubes. This is done coarse adjustment. For fine adjustment is a stepless adjustment by means of thread, as in FIG. 1a , provided, however, only in sections, ie to bridge the area between two through holes. Here, the thread cost and production is provided only on a short section of the outer tube 2.

Claims (12)

1. A method for the attachment of a headpiece (5) to the front of a telescopic prop (1) comprising a tube (3), wherein the headpiece comprises a connection device (52) at the top for carrying a load resting on the top and an inner tube (51) extending downwards at the bottom for being inserted into the tube (3) of the telescopic prop (1), comprising the following steps in the specified order:

   a. inserting the inner tube (51) extending downwards into the tube (3) of the telescopic prop (1);

   b. connecting the inner tube (51) positively and with backlash to the tube (3) of the telescopic prop by means of fixation elements (6, 8);
   characterized in that

   c. a backlash-free pretension of the headpiece and the telescopic prop connected to each other by means of the fixation elements (6) is realized by means of clamping means (7).
2. A method according to claim 1, wherein the following step is realized between step a) and b):

   a1. adjusting the clamping means such that these ones hold the inner tube with respect to the tube in such a way that the connection of step b) can take place.
3. A method according to one of the preceding claims, wherein the connection device (52) is designed such that carriers, profiles or reception parts of system components can be mounted thereon; as well as the fixation elements (6) and the clamping means (53, 6) are provided on the headpiece (5).
4. A method according to one of the preceding claims, wherein a threaded nut (7) is provided as clamping means, which nut can be screwed along the inner tube (51), which is formed as a threaded spindle (53) in at least some sections, into the axial direction thereof.
5. A method according to one of the preceding claims, wherein the threaded nut (7), the threaded spindle (53) and the fixation elements (6) are designed and arranged such that the pretension is made possible.
6. A method according to one of the preceding claims, wherein the threaded nut (7) comprises a lower plate (71), which extends in a plane perpendicular to the longitudinal axis of the inner tube, and/or comprises handle pieces (72) which are pointing away from the longitudinal axis, which are designed such that a pretension can be obtained without any tool.
7. A method according to one of the preceding claims, wherein a through bore is provided in the inner tube as a fixation element (6), which through bore is designed and arranged such that it can be aligned with a corresponding through bore (61) in the tube of the prop during insertion of the headpiece into the tube.
8. A method according to one of the preceding claims, wherein a guidance is provided, which requires a specific orientation of the inner tube with respect to the tube during the insertion of the inner tube into the tube.
9. A method according to claim 7 or claim 8 in combination with claim 7, comprising a set comprising the headpiece and the telescopic prop with a through bore which can be aligned with the through bore in the inner tube and with a bolt (8) which can be inserted with backlash through the aligned through bores for fixation, wherein the connected components can be preferably displaced in the axial direction, in particular by 1-5 mm, preferably by 2-4 mm.
10. A method according to claim 9, wherein in the set the outer diameter of the inner tube is comprised between 25 and 99 mm, the inner diameter of the tube is comprised between 30 and 100 mm and/or the difference between the outer diameter of the inner tube and the inner diameter of the tube is comprised between 1-5 mm, preferably between 2-4 mm.
11. A method according to one of the preceding claims 9-10, wherein in the set the telescopic prop (1) is designed as a telescopic vertical tube comprising a frontal head and/or base plate (4) at one or both free ends (21, 31), wherein the head and/or base plate (4) comprises a contact surface (41) for allowing the prop to brace against counter-surfaces, in particular a bottom, a ceiling or a wall.
12. A method according to one of the preceding claims 9-11, wherein in the set the head plate of the prop is designed as a counter-bearing for the threaded nut during pretensioning.

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