EP2268874A1

EP2268874A1 - Cramp iron for the fixation of formwork for concrete supports

Info

Publication number: EP2268874A1
Application number: EP09717838A
Authority: EP
Inventors: Dieter Bolte
Original assignee: Individual
Current assignee: Individual
Priority date: 2008-03-04
Filing date: 2009-03-03
Publication date: 2011-01-05
Also published as: DE202008013267U1; DE202008008013U1; WO2009109175A1

Abstract

The invention relates to a cramp iron for the fixation of formwork for concrete supports. The cramp iron comprises four profiles in the form of rectangular pipes (1 to 4) that can be connected to each other to form a frame, of which at least two comprise first and second pipe sections (such as 1a, 1b), which can be inserted into each other in a telescoping manner and displaced relative to each other. The pipe sections (such as 1a, 1b) are provided with borings (5), which are equipped to receive securing elements (6).

Description

Construction bracket for fixing formwork for concrete beams

The invention relates to a structural bracket specified in the preamble of claim 1 genus.

Construction braces of this type, which are also referred to as column springs, are known in many variants. They usually contain od from flat iron od. Like. Prepared profiles and are used in construction for the purpose of frame-shaped formwork formed from formwork panels and / or planks and to keep during the casting and curing of the concrete in the selected relative positions. To connect the individual profiles are perforations that od in the profiles and with these connected tabs, shoes. Like. Formed, and inserted into these holes clamping wedges, wherein for the production of frames with different inner cross sections usually in each profile more, at selected intervals arranged perforations are formed (eg, DE 23 02 851 C2, DE 26 11 587 Al, DE 31 40 024 Al). It is also known to pre-form two profiles by means of special corner lugs or by welding into L-shaped components and to connect these components to one another by separate pockets which can be pushed onto the profiles and wedges or formwork anchors assigned to them (DE 1 868 071 Ul, DE 79 05 408 Ul).

The known and generic construction brackets are composed of comparatively many individual parts and therefore expensive to manufacture and cumbersome to use. In addition, there is a risk that they are quickly unusable due to the usual during construction, little careful handling and the inevitable contamination and then laboriously disassembled into their individual parts, cleaned and possibly repaired. The loss of a clamping wedge, which despite their security on the profiles by means of wires, chains od. Like. Can not be safely avoided, leading to problems in the use of the known pillar clamps. Finally, the profiles do not always meet the requirements placed on their stability.

Based on this, the technical problem of the invention is that a Bauklam- mer of the initially mentioned type, which consists of a few items, is inexpensive to produce, can be easily cleaned when dirty and meets all static requirements.

To solve this problem serve the characterizing features of claim 1.

According to the invention, the profiles consist of square tubes, wherein at least two of the square tubes each consist of two telescopically pluggable, perforated sections. As a result, on the one hand, a high rigidity and flexural strength of the individual profiles is ensured. On the other hand, the lengths of the individual profiles can be easily adapted to the required values by relative displacement of the two sections. The fixation of the set lengths can od with the help of perforations passing through securing elements, preferably in the form of screws, pins od. Like. Made, as they are available in any hardware store. As a result, no specially adapted parts such as clamping wedges od. Like. Required, and lost fuse elements can be easily replaced. Dirty parts can finally with simple means, eg. B. od by spraying with a garden hose. Like., To be cleaned.

Further advantageous features of the invention will become apparent from the dependent claims.

The invention will be explained in more detail below in connection with the accompanying drawings of exemplary embodiments. Show it:

1 shows schematically the front view of a first embodiment of a construction clamp according to the invention, composed of square tubes;

Fig. Ia and Ib enlarged cross-sections through two a square tube of the construction bracket of Figure 2 forming pipe sections.

FIGS. 2 and 3 each show a plan view of a single square tube of the construction bracket Fig. 1;

Fig. 4 shows schematically a connecting means for connecting two square tubes with an adjustable angle;

Fig. 4a and 4b details of the connecting means of Fig. 4;

Fig. 5 is a view corresponding to Figure 1 of a second embodiment of a construction clamp according to the invention.

Fig. 6 and 7 plan views of a single square tube of the construction bracket after

Fig. 5;

Fig. 8 is a view corresponding to Figure 1 of a third embodiment of a construction clip according to the invention. and

9 is a plan view of a single square tube of the structural clip according to FIG. 8.

According to Fig. 1 to 3, a construction bracket according to the invention comprises four interconnected to a frame, preferably made of steel profiles in the form of square tubes 1 to 4 with rectangular or square cross-sections. Each square tube 1 to 4 contains two first and second, telescopically pluggable, preferably continuously straight pipe sections Ia, Ib to 4a and 4b. In the exemplary embodiment, the pipe sections Ia to 4a each have a slightly smaller outer cross section than the pipe sections Ib to 4b, as shown schematically in Fig. Ia and Ib, so that the pipe sections Ia to 4a introduced with little play in the pipe sections Ib to 4b and in These can be moved axially. To ensure their relative position, the pipe sections Ib, 2b, 3b and 4a each have a continuous perforation 5, whereas the other pipe section Ia, 2a, 3a and 4b of a pair has a plurality of such perforations 5, which in the longitudinal direction of the square tubes. 1 to 4 spaced apart. This allows the Square tubes 1 to 4 are each set to a preselected length, which is then fixed by introducing a securing element 6 in aligned perforations 5 of the two associated pipe sections Ia, Ib and so on. The perforations 5 are preferably made of holes with circular or square cross-sections, while the securing elements 6 of simple screws, with

Heads provided bolts, cramps od. Like. Exist and are dimensioned such that the two pipe sections Ia, Ib, etc. of a pair after insertion of a securing element 6 can not be moved axially relative to each other or only with little play.

At the free ends of the square tubes 1 to 4 are provided with connecting means for mutual connection. These are formed in the embodiment of FIG. 1 to 3 as screw connection elements. For this purpose, z. B. the square tube 2 at its one end two on opposite outer walls of the pipe section 2b arranged in parallel reinforcing elements 7 z. B. in the form of stiffening plates, which are preferably secured by welding and in the pipe section 2b superior areas each having a preferably circular hole 8 (FIG. 2). The distance between the two reinforcing elements 7 is so large that an associated end portion of another square tube, here z. B. the pipe section 3 a of the square tube 3, between them can be inserted. At the opposite end, however, the square tube 2 only has a through hole 9, the z. B. connects to the perforations 5. A corresponding hole 9 is provided at the free end of the tube section 3 a of the square tube 3, while at the free end of the tube section 1 b of the square tube 1 corresponding reinforcing elements 7 are fastened with holes 8. The connection of the square tubes 1, 2 and 3 can therefore be made simply in that the free ends of the pipe sections 2a and 3a inserted between their associated reinforcing elements 7 of the pipe sections 1b and 2b and then by means of securing elements 10 in the form of simple Fixing screws, heads having pins od. Like., Which are inserted through the holes 8 and 9, are firmly connected to the reinforcing elements 7. Also for these compounds are therefore no special fastening elements, in particular no clamping wedges od. Like. Required.

The fourth square tube 4 in FIG. 1 is used in the exemplary embodiment as a securing rod and serves to prevent spreading of the square tubes 1 and 3 transversely to their longitudinal axes in the mounted state of the structural clip. The connection of the square tube 4 with the upper in Fig. 1 ends of the square tubes 1 and 3 is z. B. by further screw. For this purpose, z. B. threaded bolt 11 inserted into the upper ends of the pipe sections Ia and 3b. These threaded bolts 11 are arranged parallel to the longitudinal axes of the pipe sections Ia, 3b and z. B. held by end plates 12 in position, which are secured in the pipe sections Ia, 3b by welding.

The application of the construction clamp described is shown in Fig. 1 by means of a formwork for a horizontally arranged concrete beam. As usual, the formwork contains a plurality of formwork panels 14 arranged in a rectangle or square formation or the like, which are arranged here in a U-shape and bound an upwardly open space. Before liquid concrete 15 is poured into this room, z. B. the three square tubes 1, 2 and 3 adjusted by appropriate displacement of their pipe sections Ia, Ib, 2a, 2b, 3a and 3b to the required lengths and in this position by the hedging elements 6 fixed. To facilitate this process, the perforations 5 of at least the square tubes 2 and 4 are particularly advantageously arranged at such distances from each other as the edge length of standardized concrete beams (eg 11.5 cm, 17.5 cm, 24 cm, 36 cm and 50 cm) and twice the thickness of conventional formwork panels 14 (eg 20 mm). In contrast, the lengths of the two lateral square tubes 1 and 3 in the manufacture of horizontal concrete beams, as shown in FIG. 1, merely set so that they are greater than the height of the concrete beam to be produced.

After assembly of the three square tubes 1, 2 and 3 by means of the reinforcing demente 7 and the securing elements 10, the prefabricated, U-shaped clamp member shown in FIG. 1 is applied to the formwork panels 14. To fall off this To avoid staple parts, attached to the outer walls of selected square tubes, preferably the square tubes 1 and 3, at least one fastening tab 16, preferably by welding (see in particular Fig. 9), which is provided with a hole 17 (Fig. This makes it possible to od the square tubes 1 and 3 by means of a respective one of the holes 17 introduced nail od. Like. To attach to the associated panel 14. Of course, at least one such fastening tab 16 can also be attached to the square tube 2.

Subsequently, the square tube 4 is mounted, the od with suitable perforations 8a, 9a (Fig. 3) attached to the threaded bolt 11 and, if necessary, with fasteners 18 in the form of wing nuts od. Like. Is attached to the remaining bracket part. However, such attachment in the production of horizontal concrete beams is not absolutely necessary because the square tube 4 is already held by gravity on the threaded bolt 11 here. In addition, the square tube 4 can be arranged in this case, as shown in FIG. 1 above the formwork, because this need not have upper panel 14. All this work can be done easily by a single person, because the total weight of a construction bracket is relatively small because of the small number of parts. Finally, it is expedient to mount the square tube 4 only after the formwork with the required reinforcing bars od. Like. Has been occupied.

In the production of a vertical concrete beam is proceeded accordingly. However, since the formwork here has four rectangular or square arranged formwork panels 14 od. Like. Must have to make in this case, the arrangement so that the lengths of the square tubes 1 and 3 have the required level and the square tube 4 after attaching to the Threaded bolt 11 and fastening by means of the connecting elements 18 to an associated formwork panel 14 rests firmly.

Figures 4, 4a and 4b show means making it possible to connect two square tubes (eg 3 and 4) at an angle other than 90 °. These means each contain one end plate 19a, 19b in mutually associated ends of two pipe sections (eg, 3b and 4a) and in threaded bores of the end plates 19a, 19b rotatably arranged threaded bolts 20a and 20b. In that regard, the arrangement is similar to the threaded bolt 11 and end plates 12 of FIG. 1. In addition, the two of the end plates 19a, 19b projecting ends of the threaded bolts 20a, 20b are connected to a in Fig. 4 only schematically illustrated pivot 21, by means of which Angular position of the two pipe sections 3b and 4a can be varied continuously by relative pivoting about the axis of the rotary joint 21 within wide limits, as indicated in Fig. 4 by an arrow. The connection described allows the support of formwork with z. B. trapezoidal outer cross sections. If a change in length of the square tubes 3 and / or 4 is required for this purpose, this can be effected independently of the spacing of the perforations 5 (FIG. 1) in that the threaded bolts 20a, 20b more or less deeply into the corresponding end plates 19a, 19b be screwed. The hinge 21 may, for. B. 4a and 4b be realized in that at the free ends of the threaded bolts 20a, 20b each have a U-profile 21a, 21b is attached, which has a through-hole 22a, 22b. The cross-sections of the U-Profϊle 21a, 21b are chosen so that they fit into each other according to Fig. 4b and after alignment of the screw holes 22a, 22b by means of this projecting through a fastening screw 23 can be pivotally connected together. The angular position of the square tubes 3, 4 produced in the individual case can then be fixed by means of a nut turned on the fastening screw 23.

Alternatively, it is of course also possible, the reinforcing elements 7 in such a way that the introduced into them ends z. B. the pipe sections 2a, 3a can be arranged at least limited with deviating from 90 ° positions.

The illustrated in Fig. 5 embodiment of a construction clamp according to the invention is based on the same solution principle, ie the use of square tubes 25 to 28, which are composed of telescopically nested pipe sections 25a, 25b to 28a, 28b and preferably fastening tabs 16 have. Different are here only for the connection of two square tubes 25 to 28th certain connecting means.

As particularly shown in FIGS. 6 and 7, the tube sections 26a, 26b of the square tube 26 each have a receptacle 29 or 30 at their free ends. The receptacles 29, 30 have the outer cross sections of the square tubes used corresponding inner cross sections. In particular, the receptacle 29 is formed from a short piece of a square tube whose inner cross section corresponds to the outer cross section of the tube section 26b with the larger inner cross section, whereas the receptacle 30 is formed from a short piece of a square tube, the inner cross section of the outer cross section of the pipe section 26a with the smaller internal cross section corresponds. This makes it possible, as indicated in Fig. 5 only schematically, the free end z. B. the pipe section 25 with little play in the receptacle 30 and the free end z. B. the pipe section 27b with little play in the receptacle 29, whereby the construction bracket can be completely or partially pre-assembled. The actual fixation then takes place with the aid of simple securing elements 31 in the form of screws, pins or the like, which are inserted through aligned holes in the tube sections 25a, 27b and the walls of the associated receptacles 29, 30.

As particularly shown in FIGS. 6 and 7, the square tubes 25 to 28 are preferably all identical. Therefore, at the four corners of the frame surrounding the formwork, formed from the square tubes 25 to 28, a tube section with a small outer cross section (eg 26a or 28a) and a tube section with a large outer cross section (eg 27b and 25b) abut one another ,

The fastening straps 16 in the exemplary embodiment according to Figures 5 to 7 can optionally be mounted only on selected square tubes (eg 25, 27) or also on all square tubes 25 to 28, in which case the structural clamp consists of four identical parts. In addition, Fig. 5 shows that the upper, designed as a safety bar square tube 28 are inserted in the production of horizontally arranged concrete beams only on the pipe sections 27a, 25b needs on which it can slide down by gravity to the stop on the formwork panels 14. A backup by the securing elements 31 is required only in the production of vertical concrete beams.

8 and 9 show an embodiment which largely corresponds to the embodiment of FIGS. 5 to 7. In contrast to this, only two square tubes 33 and 34, which come to lie above and below the formwork during assembly of the structural bracket, each have a receptacle 35 at the ends of their tubular sections 33a, 33b, 34a and 34b. In contrast, for the lateral support of the formwork each profiles are provided which consist of integrally formed, straight square tubes 36 and 37 with preferably constant constant and the same outer cross sections. It is therefore possible to provide all the receptacles 35 with the same, the outer cross sections of the square tubes 36, 37 corresponding inner cross-sections and when assembling the bracket on the corresponding to FIG. 8 z. B. vertically arranged square tubes 36, 37 postpone. Fixing a selected location of the

Square tubes 33, 34 along the square tubes 36, 37 takes place as in the embodiment of FIGS. 5 to 7 with the aid of formed in the square tubes 36, 37 rows of holes 38, in the receptacles 35 of the square tubes 33, 34 formed holes 39 and not shown Securing elements, wherein a fixation of the upper, designed as a safety bar square tube 34 is required only in the production of a vertically arranged concrete beam. Apart from that it is clear that the two square tubes 33, 34 can also be used for the lateral and the two square tubes 36, 37 also for the upper and lower support of the formwork.

When using the construction brackets described is the common installation of arranged between these and the formwork squared timbers od. Like. Not required. Rather, the square tubes can be applied directly to the formwork panels 14 or the like. Depending on the length of the concrete beam to be produced, it is also possible to provide at predetermined intervals two or more construction brackets per concrete beam. The invention is not limited to the described embodiments, which can be modified in many ways. In particular, it is clear that, depending on the lengths and cross sections of the concrete beams to be produced, several sets of square tubes with different wall thicknesses and cross sections can be provided in order to meet different static requirements. Further, other than the described connection means may be provided for the square tubes, in particular those which allow the quick and easy assembly of the structural bracket on the site in the manner of a quick connector. The same applies to those means which allow a relative Winkelein- position of the square tubes. 1, 5 and 8 show that a staple part composed of three square tubes (eg 1, 2 and 3) can always remain in the assembled state, since both the width and the height adjustment in the assembled state can be carried out and the U-shaped preassembled clamp part can always be placed on the formwork from the outside. Furthermore, it is clear that the number and the distances of the perforations 5 and 38 are largely freely selectable and the majority of perforations 5 could be provided in the pipe sections with the larger outer cross sections. Finally, it is understood that the various features may be applied in combinations other than those described and illustrated.

Claims

claims

1. Construction bracket for fixing formwork for concrete beams having substantially rectangular or square cross sections, comprising four interconnected to a frame profiles, which are provided with specific for changing the frame size perforations and with each other for connecting means, characterized in that the profiles consist of square tubes (1 to 4, 25 to 28, 33, 34, 36, 37), of which at least two respectively first and second, telescopically plugged into one another and relatively displaceable pipe sections (eg Ia, Ib), and the perforations (5) are formed in the tube sections (eg, Ia, Ib) and adapted to receive securing elements (6).

2. Construction bracket according to claim 1, characterized in that the connecting means provided at free ends of the pipe sections receptacles (29, 30, 35), the outer cross sections associated square tubes (25 to 28, 36, 37) have corresponding inner cross-sections.

3. A construction clamp according to claim 2, characterized in that all four square tubes (25 to 28) each have a first and a second pipe section (eg 26a, 26b), wherein the first pipe section (eg 26b) has a large pipe section Inner cross section and the second pipe section (eg 26a) has a small, in the first pipe section (25b) matching inner cross section and wherein the receptacles (30) at the ends of the first

Pipe sections (eg, 26b) having inner cross sections corresponding to the outer cross sections of the second pipe sections (eg, 26a) and the seats (29) at the ends of the second pipe sections (eg, 26a) having the outer cross sections of the first pipe sections (e.g. B. 26b) are provided corresponding inner cross-sections.

4. A construction clamp according to claim 2, characterized in that only two square tubes (33, 34) each have a first and second pipe section (33a, 33b, 34a, 34b) which two other square tubes (36, 37) are integrally formed and the receptacles (35) with the outer cross sections of the one-piece square tubes (36, 37) corresponding inner cross-sections are provided.

5. A structural bracket according to claim 1, characterized in that the connecting means at free ends of the square tubes (1 to 4) provided Schraubverbindungselemente (11, 12, 18).

6. A construction clamp according to claim 1 or 5, characterized in that at least one square tube (eg 4) and two for connection to this square tube (4) certain square tubes (eg 3) at free ends with means (19a, 19b to 23) which allow different angular positions of the square tubes (eg 3, 4) relative to each other.

7. Construction bracket according to claim 6, characterized in that the means (19a, 19b to 23) for adjusting the length of the square tubes (1, 3, 4) are arranged.

8. Construction bracket according to one of claims 1 and 5 to 7, characterized in that selected pipe sections (eg Ib, 2b) are provided on free outdoor with reinforcing elements (7).

9. Construction bracket according to one of claims 1 to 8, characterized in that at least selected square tubes (1, 3, 25, 27) are provided with fastening tabs (16).

10. A construction clamp according to one of claims 1 to 9, characterized in that the perforations (5, 38) are arranged at intervals, for fixing of formwork for concrete beams with standard sizes of 12.5 cm, 17.5 cm, 24 cm, 36 cm and / or 50 cm are dimensioned.