Steel tube shore with quick lowering.

The invention relates to a steel tube column for slabs or the like, having two telescoping plug end pipes of which the outer at the insertion end has a thread, wherein in the region of the thread extending in the longitudinal axis of the support, this by releasing radially long hole provided is, by and at the same time through a provided in the inserted pipe hole a pin is stuck, which can be supported on a nut screwed onto the thread of the outer tube threaded sleeve.

Steel props of this type are often, especially in the concrete encasing ceilings or the like, used. It is known (DE-GM 84 21 204), for the purpose of so-called rapid lowering between the threaded sleeve and the constraints imposed by the two pipes bolt to arrange a freely rotatable sleeve, located with in different heights which the bolt edge facing in the form of a cam surface bearing surfaces is formed, on which the bolt is supported by its two of the tubular steel prop projecting ends. For shuttering and during the time of scarf pin rests on the higher-lying support surfaces. Should be solved for the purpose of rapid lowering of the formwork, the head end of the tubular steel prop to decrease turn the screw socket tension can, the socket is rotated about 90 °, so that the bolt can slide down to the lower-lying bearing surfaces and, accordingly, the head of the tubular steel prop from the formwork is released.

It has been found that during the assembly of such a steel tube column by doing the necessary rotation of the threaded sleeve which can be rotated on their surface mounted socket, so that the rapid lowering occurs before the final assembly and the tubular steel prop is mounted carelessly assembly with lowered head , In this case, a rapid lowering of the expansion is no longer possible. In addition, the cam surface provided with the freely rotatable bushing is an additional component, which not only causes extra costs, but also increases the weight of the steel tube column. Finally, it has also proven to be disadvantageous in that the time allotted for this type of quick setback jack can not be retrofitted to existing telescopic steel props, because according to recent legislation, the two tubes tubular steel props have to be permanently connected to each other, so do not be drawn that apart can, so that the bushing can not even be fitted subsequently.

The invention has for its object to simplify the quick setback and to establish the feasibility of equipping already assembled steel props with a simple and inexpensive quick setback.

This object is achieved in that the inserted through the aligned holes of the telescopically assembled two tubes of steel tube column and supporting on the threaded sleeve bolt has two spaced at different radial distances from the longitudinal axis and spaced apart support surfaces for the inserted pipe, on where the pipe may alternately lie, whichever position of the inserted tube is desired. Unlike prior tubular steel props with quick setback no additional component is required according to the present invention for the rapid lowering. Rather, only a modification of the male pin is required, so that for rapid lowering no additional component is required and already finished steel props with the rapid lowering of the invention can easily be equipped, because for this purpose only the anyway required bolts must be replaced.

Preferably configured for rapid lowering bolt between its ends has two spaced-apart of the diameter of the inserted pipe of tubular steel prop wells that are at least as wide as the wall thickness of the pipe. The recesses may for example be mounted eccentrically to the longitudinal axis of the pin. These recesses can be simple and inexpensive to manufacture and serve as one of the two surfaces on which, while the outer surface or outer surface of the bolt forms a pipe of the support and the other bearing surface.

To facilitate the necessary for the rapid lowering displacement or axial displacement of the bolt, the bolt may have in the recesses leading slightly inclined planes. With a hammer blow to the outstanding from the tubular steel prop end of the bolt can be easily adjust this from Mona day position in the desired for the rapid lowering position.

According to another feature of the invention, the bolt at one end a stop limiting its insertion on, for example, a legend himself against the outside of the threaded sleeve nose. This ensures that the desired for the normal operating position position is to be exactly, although the actual support areas, which are located within the tubular steel prop, are practically invisible from the outside.

Since the threaded sleeve is rotated while setting the desired sound position of the column head, the inserted bolt but can only be moved in the axial direction of the pin during rotation of the threaded sleeve is not changed in an undesirable manner. Thus, the installation of the equipped with the rapid lowering of the invention tubular steel prop is simplified. Moreover, no additional components are required for the rapid lowering that cause costs and the weight of the steel tube column bigger.

In the drawing, an embodiment of a steel tube column according to the invention with quick setback, namely shows <ul><li>1 shows a longitudinal section of a tubular steel prop with external thread in the operating position and</li><li>Figure 2 is a longitudinal section of the tubular steel prop as in Figure 1, but with lowered inner pipe section, so that the head plate is released from the mold, which they originally supported.</li></ul>

A steel tube column 1, of the in the drawing only the upper portion is shown, has an outer tube 2 and in this plugged telescopically on and retractable inner tube 3, which is provided at the outer end with a top plate. 4 This tubular steel prop can however also be used in an inverted position so that the plate 4 then rests a foot on the ground while then attached to the outer end of the tube 2, not shown similar plate serves as a top plate in the drawing.

On the drawing in the upper end of the tube 2 is a tubular extension 5 is fixed with an external thread 6 on the latter, onto which a threaded sleeve 7 is screwed on. The extension 5 includes an extending along the longitudinal axis of the tubular steel prop 1 slot 8 through which a pin 9 can be inserted, which is supported on the threaded sleeve. 7

The inner tube 3 is arranged with a number of axially spaced from each other, it passes through holes 10 in the radial direction, through which the bolt 9 can be inserted. For insertion of the pin 9 of one of the holes 10 of the inner tube 3 is brought into the range of the long hole 8 and the pin then inserted. Then the threaded sleeve 7 is rotated on the thread 6 to the plate 4 is at the desired altitude.

The bolt 9 has on one side two recesses 11 and 12 which are provided in a the diameter of the inner tube 3 corresponding distance from one another and have a width which is greater than the wall thickness of the tube 3rd The recesses 11 and 12 are arranged in the illustrated embodiment eccentrically from the pin. 9

At the rear end of the bolt 9 is an eye 13 arge arranged through which a wire ring is inserted 14, which is guided around the pipe 2 to captively connect the pin 9 with the tubular support 1 and to prevent the pin upside down, namely pointing with the recesses 11 and 12 to the threaded sleeve 7 can be inserted.

The eye 13 is provided with an extension in the form of a web 15, in the longitudinal direction of the bolt 9 extends the same on the outside and forms a stop, with the insertion of the bolt is limited. 9

As Figure 1 shows, the web is 15 to the inserted pipe 3 when the pin 9 is inserted in the normal operating position, in which the inner tube 3 is supported on bolt portions 9a and 9b in addition to the depressions 11 and 12. FIG. These bolt portions 9a and 9b may be slightly tapered toward the associated recess 11 and 12, respectively, to facilitate the required during the lowering of the inner tube 3 sliding movement between pin 9 and the overlying tube 3rd

To the steel tube column 1 from the position shown in Figure 1 position, in which the plate 4 rests against the bottom of a formwork 16 or other to be supported member, to be brought into the position shown in Figure 2, in which the inner tube 3 is lowered and Accordingly, the plate 4 is like a distance from the formwork or, the bolt 9 is shifted so far to the left that the inner tube 3 passes into the region of the recesses 11 and 12. FIG. For this purpose, for example, beaten to the illustrated in the drawing on the right end 12a of the bolt 9 with a hammer. Especially when the bolt portions 9a and 9b are slightly beveled, requiring only one hammer to move the bolt from the position shown in Figure 1 in the position shown in FIG. 2 Thus, a simple quick setback and a rapid expansion of steel tube column 1 is ensured.

The recesses 11 and 12 need not be particularly deep, so that they hardly weaken the bearing cross section of the bolt, because it is sufficient for the rapid lowering, release the forces acting on the threaded sleeve 7 on the plate 4 pressure. To remove the steel tube column 1, the threaded sleeve 7 is rotated back, which is possible without requiring particular force when the force acting on it supporting pressure is lifted.

In the illustrated embodiment, the depressions 11 and 12 are arranged eccentrically. The forming the stop web 15 is the recesses 11 and 12 provided opposite to the outside of the bolt 9 so that you only have to be careful when inserting the bolt, that the web 15 facing upwards, to ensure that in repelling the pin 9 the desired reduction is achieved. This is guaranteed if the web, as shown in Figure 1, protrudes into the elongated hole 8 of the outer tube. 2

Since the depressions 11 and 12 does not significantly weaken the bearing cross section of the bolt 9 may be equipped also existing steel pipe supports with such bolts, because the overall diameter need not be enlarged relative to pin used hitherto and the pin 9, accordingly, also in the holes of the inner tube 3 and the slot of the outer tube 2 existing steel props fit.