SU94673A1 - Fixture for tension fittings - Google Patents

Description

An armature tensioner is proposed, in which a self-tightening wedge die is used, which simplifies switching on and off of the work, including in those cases where the ends of the reinforcing bars do not protrude beyond the dimensions of the product.

In the device is provided prnmenpenny external. the sliding slide bars (on approach) and the pusher associated with these slashes.

The spring causes the initial clamping of the reinforcing bar when tensioned, and the plunger extends the nipple from the clamp position when the tool is turned off.

For operating the pusher, a second spring may be applied, tending to push the pusher out of the housing of the device, and to actuate this spring, the button has a button, against which the head of the pusher rests in the working position of the device.

FIG. 1 shows the device in longitudinal section along the AL in FIG. four; in fig. 2 and 3 are transverse sections of BB and B B in FIG. one; in fig. 4-arrangement of devices in the end part of a double-hollow reinforced concrete flooring flooring element

Wedge dies / vetavleni in body 2 are fitted and are under the action of an eager spring 3, abutting with one end into the diaphragm of the shank 4 screwed into body 2 and the other into the dies through the washer 5, as a result of which the dies tend to close and clamp the reinforcing bar . The closures are attached to the cloaks: With the pin 6, the pusher 7 is attached, which serves to extend the sleeves when the attachment is turned off. A button 8 is inserted into the shank 4, which, with a certain rotation, can go out of the annular shank and, under the influence of the spring 9, hit the head of the pusher 7. A nut 10 is screwed onto the shank 4, which stops the tool in the formwork.

No. 94673-2 -

To tension the reinforcement, a device with a compressed spring 9 (Fig. 1) is inserted into the formwork and the end of the rebar is inserted into it. The spring 3 produces lamination of the lugs 1, which, however, the tension of the reinforcement is self-engaging and creates its secure fixing in the device. The rubber diaphragm 11, mounted on the tord of the housing, serves as protection against the concrete mixture entering the cartridge. The tension of the reinforcement is produced by a jack, which is exciting for the tailings of the shank.

To remove the prefabrication from the finished concrete product, first remove the nut 10 from the stop and turn the button 8 around its axis until its shoulders exit the annular groove in the shank, then lightly strike the end of the shank. Due to the rotation, the spring button 9 opens and presses the button before meeting the pusher head 7, and as a result of hitting the tailpiece face, the clutch is removed (if no measures are taken to prevent such adhesion) between the outer surface of the cartridge and the concrete, rubber buffers 12 reinforced at the end of the case 2 screws 13, elastically szhmuts and the whole cartridge sums in the direction of impact. The movement of the cartridge will wedge the dies /, and the actual force of the spring 9, overcoming the force of the spring 3, immediately pushes the pusher 7 to the right and releases the clamp: the reinforcement bar between the rams. After that, the device can be removed from the hole in the formwork.

The use of spring 9 with button 8 is not necessary. In the absence of these parts, the pusher 7 is made somewhat longer and is extended outside the shank. In this case, before the work is done, the end of the body is moistened in molten paraffin to form a solidifying layer 14 with a mass of 3-4 mm and then inserted into the formwork to tension the reinforcement. When the product is concreted, the narafiy layer coats a gasket between the end of the body and the concrete, and then during the steaming process, the paraffin melts and leaves a gap that is sufficient to feed the cartridge into the product to wedge the dies.

In order to release the cartridge from the formwork, the nut 10 is retracted from the stop, and it is easy to hit the end of the shank and pull the pusher 7 back. From hitting the shank, remove the adhesion (if measures are not taken to prevent such an engagement) between the outer surface of the cartridge and the concrete, the casing is moved forward and causes unraveling of the dies, and by pushing the plunger of the DIRE lead into the rightmost position and release clamped reinforcement.

The rubber buffer 12 in this embodiment is not obscure, but it is useful as a protection against damage if there is no necessary gap between the end of the casing and the concrete, as a result of an underdeveloped layer of paraffin or its accidental shading.

Subject invention

Claims (2)

1. Priepoeoblepie for tension reinforcement in the manufacture of prestressed zhelezobeto1P1YH elements, wherein the applied eamozazhimnye wedge plates, characterized in that for the clamping of the initial eterzhn reinforcing wedge rams, spring applied, tending to move the conductive plaschki on convergence, and for extending plaschek From the position of the clamp, when the device was turned off, a pusher, connected with these dies, was used. 2. The tool according to claim I, characterized in that the second spring is applied to actuate the pusher, which tends to push the pusher out of the tool body, and the button in which the head of the pusher rests on the tool state abuts the spring. i -V /// 1 1 U - ( i, -xV / z - i . C - Y7 ///// 7