SU903542A1 - Device for tensioning and subsequent relieving of reinforcements - Google Patents

Description

one

The invention relates to devices for tensioning reinforcement on a pallet and can be used in precast concrete plants for the manufacture of prestressed products.

A device for tensioning reinforcement on a pallet, including a pallet, a turning support in the form of a U-shaped cross bar, articulated latches, 1, is known.

A disadvantage of the known device is the tensioning of the reinforcement on the pallet due to its preheating.

It is also known a device for tensioning reinforcement on a pallet, including a pallet, pivoting stops and a latch 2.

The disadvantage of this device is the need for large forces to turn the stops.

The closest to the invention to the technical essence of the achieved effect is a device for tensioning and subsequent tempering of reinforcement in the manufacture of concrete products, including a form with a swivel support, retainers and a pusher 3.

A disadvantage of this device is the tensioning of the reinforcement on the pallet due to its preheating.

The purpose of the invention is to reduce the force for tensioning the reinforcement.

5 The goal is achieved by the fact that in a device for tensioning and subsequent tempering of reinforcement, including a form with a rotary support, retainers and a pusher, it is equipped with a link, hinged pin, Q inserted at its ends to the rotary stop and pusher.

FIG. 1 shows the device, a general view; in fig. 2 is a section A-A in FIG. one.

The device consists of a rotary stop 1 with a cam 2, made with a longitudinal slit 3, designed for placing the rebar 4 into it, as well as with the inner 5 and outer 6 shoulder, which is fixed to the longitudinal elements of the pallet 7 by means of an axis 8. On the inner . In this case, the shoulder 5 of the stop is fixed by an additional axis 9, the upper end of the earring 10, the lower end of which is fixed by an additional axis 11 to the plunger 12 of the stop located in a guide device made of rollers 13. The plunger 12

the anvil is provided with a check 14, and on the transverse elements of the pallet 15 there is a fixture 16 fixed to the position of the anvil pusher 12. The removal of the finished product 17 is carried out using a wedge 18.

The device works as follows.

The push rod 12 of the stop is pulled out from the pallet to the extreme position and a reinforcing bar 4 is placed into the slot 3 of the cam 2, after which a longitudinal force P is applied to the push bar 12 of the stop, under the influence of which the pushrod 12 of the stop moves between the rollers 13 inside the pan and turns the shackle 10 The latter in turn acts through an additional axis 9 on the inner shoulder 5 of the pivoting support 1, which at the same time rotates relative to the center of the axis 8, whereby the cam 2 of the pivoting support 1 moves away from the center of the s and causes the tension of the reinforcing rod 4. Moreover, to the extent of rotation falls and approaches earring 10 to the vertical position of the horizontal component force therein uravnoveshivaema external load P is reduced. Therefore, when the armature is tensioned to the maximum value, the external load P practically reduces to overcoming the friction forces between the push rod 12 and the rollers 13, -a after the vertical position has passed 10, the push rod 12 stops already moving independently until it touches the clamp 16, due to which forces in the elements of the device are self-balancing. In this latter position, a pawl 14 is inserted into the anvil 12, preventing the spontaneous rotation of the pivot abutment 1 in the reverse direction during the process of transporting the pallet, forming and heat treating the product 17 on it.

Removing the prestressing of the rebar during removal of the finished product 17 is carried out by means of a wedge 18, which is inserted between the pusher, 12, and an end face with the transverse element 15 of the pallet 15.

The use of the proposed device eliminates the need to preheat the reinforcing bars, as well as due to the presence of an intermediate link, significantly reduces the force for tensioning the reinforcement and smoothing it out.

Claims (3)

Invention Formula A device for tensioning and subsequent tempering of the armature, including a form with a rotary stop, clamps and a pusher, characterized in that, in order to reduce the efforts for tensioning the armature, it is equipped with a link that is hinged at its ends to the pivot stop and the pusher. Sources of information taken into account in the examination. 1. USSR author's certificate No. 273402, E 04 G 21/12, 1970. 2. USSR author's certificate 0 № 374432, cl. At 04 G 21/12, 1973. 3. USSR author's certificate number 531915, cl. B 04 G 21/12, 1974. g /