DE1056522B - Core formwork for the production of concrete pipes of great length, consisting of formwork segments that can be expanded by means of rods arranged concentrically inside - Google Patents

Description

The invention relates to a core formwork for the production of concrete pipes, which are made of a in the interior of the pipe there is a concentrically arranged rods expandable shell segments,

In a known device of this type, the spreader consists of spreader rods which through on a central control spindle oppositely arranged Gewitidernuffen are operated ·. As core formwork a sheet metal jacket is used, which is slit along a surface line so that its two Overlap the longitudinal edges at this point. The sheet metal jacket slit in this way is shifted the threaded sockets are reduced or enlarged by means of the expanding rods. A The disadvantage of this device is that the parts of the lying between each two Spreizstaingen Sheet metal jacket when contracting or expanding these rods are shortened or lengthened, whereby the corresponding segments of the sheet metal jacket suffer a deformation. The well-known facility therefore does not allow the diameter of the core tube while maintaining the exact circular shape change.

A device is also known in which the inner formwork consists of four formwork segments, which are spread or drawn in by spreader bars engaging in the middle of these segments, by axially displacing a neck ring on a rod. This well-known facility has above all the Disadvantage that when spreading and folding the shell segments on this an axial thrust or pull is exercised. In particular, when the formwork is folded in, the axial pull causes a one-sided Force to be exerted to a considerable extent, whereby there is the risk that the not yet fully hardened Concrete mass is torn out or damaged.

The invention avoids these disadvantages in that on the two longitudinal edges attack the arms of hinged, double pairs of spreader arms on each scarf segment, each of which acts on two adjacent shuttering segments through a pivot lever, which engages on one scarf segment and on a support attached to the adjacent scarf segment is rotatably mounted.

According to an expedient embodiment, the invention provides that the between two shell segments The gap formed is circular and receives a hose which can be precipitated with water or air.

Further details and advantages of the invention emerge from the following description of a Embodiment based on the drawing. In the drawing shows

Fig. 1 shows a section of the core formwork with the core dialing for manufacturing

of concrete pipes of great length,

consisting of by one in their interior

concentrically arranged rods

expandable scarf segments

Applicant:

Josef Boessner,
Bad Aibling (Obb.), Ludwig-Thoma-Str. 5

Josef Bössner, Bad Aibling (Obb.),
has been named as the inventor

associated operating linkage in longitudinal section,

Fig. 2 shows the cross section of a pipe formwork according to the invention.

According to the invention, a raw duct bed 1 made of lean concrete is first prepared in the usual way. Then a core formwork frame consisting of four formwork segments 2 is placed in this pipeline bed inserted, which can have a length of 100 m, for example. On the core formwork scaffolding two rows of extendable and retractable stands 3 and 3 'can be used for this purpose be provided. These stands can be operated pneumatically or hydraulically and secure the concentric Position of the core lining as long as the concrete is not filled. After filling, but before the hardening of the concrete, the uprights 3 and 3 ' moved in.

The shell segments of the core formwork are articulated to a number of double pairs of expanding scissors 4, 4 ', 4 ", 4'" which, for. B. are arranged at intervals of 1 m and can be actuated by a central control shaft 5. The control shaft 5 consists of several articulated interconnected shaft parts of, for example, 10m, a drive motor 6, which is expediently a compressed air motor, is arranged between each two successive shaft parts. The expanding shears 4, 4 ', 4 ", 4'" are actuated by the rotating shaft 5 by a spindle drive, in the threaded sockets 7 and T, of which the

909 508/261

Claims (3)

one has a right-hand thread and the other a left-hand thread, on corresponding spindle threads of the Wave 5 sit. As can be seen, so are the spreading scissors open or closed, depending on the control shaft 5 in one direction or the other is set in rotation. Each expanding scissor is articulated with two adjacent shuttering members by means of a pivot lever 8 connected, which engages one segment member and one on the adjacent segment member fixed support 9 is rotatably mounted. The arrangement is made so that at one radial displacement of the scissors the two "segment members in the circumferential direction approached each other or be removed from one another, so that the gap 10 formed between the segment members closes or expands. Since all four scissors are operated at the same time, all four will also move Segment members of the core formwork at the same time approach one another or move away from one another, whereby the diameter of the core formwork decreased or increased. The dimensions are chosen so that with splayed shell segments, d. H. when the gap 10 formed between each two members widens is, the diameter of the core formwork corresponds to the desired inner diameter of the pipe, while with the shell segments moved together, that is to say with a narrowed gap 10, the diameter of the core shuttering is so reduced that the core shuttering is off the concreted pipe body can be pulled out in the longitudinal direction. On the formwork scaffolding inserted in the pipe bed, the Motors 6 the; Sohalsegraente of the core formwork in their brought spread position. In order to seal the gap between each two members, the for this purpose circularly designed spaLtfugelO inserted a hose (not shown) that can be filled with water or air and 'the joint seals. The carriage 11, which carries the upper core shell 12 and can be driven on rails, is then brought up, which is shown in FIG can be raised or lowered in a known manner by winches 13 and on which another Weighting and concreting trolley 14 is mobile, through which the concrete in the prepared formwork is introduced. Finally, after the aforementioned sealing hoses have been emptied, it is switched back on of the motors 6, the link system of the core formwork moved together and thus somewhat in diameter reduced in size, whereupon the entire formwork scaffolding (after the concrete has set sufficiently) in the ίο the concreted pipe section can be moved further can (e.g. by means of a cable winch) to concretize the following section. P A T E N T A-N S P R 0.C H E: is 1. Core formwork for the manufacture of concrete pipes great length, consisting of a rod arranged concentrically in its interior expandable shell segments, characterized in that each of the two longitudinal edges Scarf segment (2) the arms of articulated, double pairs of spreading scissors (4,4 '. 4 ", 4 '") attack, each of which spreading scissors through on two adjacent scarf segments (2) a pivot lever (8) acts on the one as the shell segment (2) engages and on one of the adjacent shell segment (2) attached support (9) is rotatably mounted. 2. Device according to claim 1, characterized in that that the gap (10) formed between two scarf segments (2) is circular is designed and receives a hose that can be filled with water or air. 3. Device according to claim 1 and 2, characterized in that the expanding scissors (4, 4 ', 4 ", 4'") are to be actuated by a central control spindle (5) with the aid of opposing threaded sleeves (7 and T). Considered publications:
German patent specifications No. 24354, 655 556,
097; Austrian Patent No. 62 572;
Swiss Patent No. 43 284;
U.S. Patent No. 1,499,762. 1 sheet of drawings