SU142009A1 - Device for tensioning reinforcement - Google Patents

Description

Devices for tensioning reinforcement on pallets of forms are known in the manufacture of prestressed reinforced concrete structures using paired struts. The spacers are angled to one another and pivotally interconnected, and the tensioning fittings are attached to the ends of the struts freely diverging as the hinge moves. The hinge moves in the direction perpendicular to the tensioned reinforcement. However, the known devices do not provide the ability to feed and remove the pallets with the fittings laid on them on the trolleys. The device for tensioning the reinforcement, made in accordance with the invention, is free of this disadvantage and, in comparison with the previously known ones, the installation of the pallet with the reinforcement for tension is simplified. The essence of the invention is that the free ends of the struts are attached to the posts of the transverse portal frames installed at the ends of the device. The frames are articulated by the lower ends on the base and stubborn cross beams (trusses) are fastened on them. The lateral dies (trusses) have the ability to rotate in a vertical plane and are designed to transfer forces to the - armature from the struts in the horizontal (lowered) position.

FIG. Figure 1 shows the proposed device for tensioning the reinforcement; in fig. 2 is a section along A-A in FIG. one; in fig. 3 is a section along BB in FIG. one; in fig. 4 is a section along BB in FIG. one; in fig. 5 - the pallet with the laid armature.

The proposed device consists of two pairs of spacers / interconnected by a hinge 2. The spacers / on one side have screw protrusions that enter the body of the struts and allow using the handwheel 3 to change their length.

The hinge 2 has a link with which the cable 4 is attached, with which the hinge 2 rises vertically. The struts / by means of the hinge 5 are connected to the swing gantry frames 6. A possible tilting of the swing gantry frames 6 is relative to the hinges 7 concreted at the base of the device. Par. No. 142009-2 -

max. 6. stop trusses 8 are mounted, which can be rotated around the axis 9 with the help of the handle 10, the cable 11, the system of blocks 12 and the counter-load 13: Lifting mechanism consists of a system of blocks M, blocks 15 horizons Shch1; Direct translation, cable / fJ and clamping sleeves 17. Couplings / 7 are used to adjust the length of cables 1-6 for synchronous operation of the hinges 2 when they are raised and lowered; "Attachment screw couplings / 7 cables 16" Blocks 14 and 75 are designed for a lifting force of up to 3 tons.

In order to reduce the speed of lifting the hinge 2, a twelve-unit tackle 18 is turned on in the tension mechanism, which is placed horizontally above the upper frame and has a fixed block system fixed on the upper crossbar of the main gantry frame of the device and a fixed block system fixed on the carriage 19, which can move along longitudinal runs of the structure within the required lift of the hinge 2, i.e. within 30–35 cm. The hoist 20 is used to tension the chain hoist. for the prestressing of the fittings, the drain is connected by a horizontal handwheel 21, along a vertical rod 22 of which a horizontal stop 23 moves with an arrow pointer 24. On the cable 4 within the vertical rod 22, the stops 25 are fastened.

The tensioning of the reinforcement is carried out on the stops of the pallet 26. During the tensioning period of the reinforcement, the pallet 26 is located on two trolleys 27, which roll under the rail tracker.

At one end of the pallet 26, the fixed channel 28 is reinforced, and at the other, the movable channel 29, which can be moved by the metal lining of the pallet 26 within the slots 30. The length of the cutting 30 in the channel 29 is determined by the elongation of the reinforcement rods when they are tensioned.

The movable channel 29 is welded with locking bolts 31 with a nut, which are fixed in forks 32, tightly welded to the ends of the pallet 26. The channel sheets 28 and 29 are welded to shaped sheets 33 with recesses at the end for laying flat collet clamps 34.

The tensioning of the reinforcement using the proposed device is performed in the following order.

Straightened and cleaned reinforcement is placed on a pallet 26 mounted on the trolleys 27.

At the ends of the rebar outlets, flat collet clamps 34 are inserted, which are inserted together with the rebar in the tapered grooves of the shaped sheet 33.

When charging the reinforcement in the slot in the movable thrust channel 29, it is necessary that the nuts on the bolts 31 are lowered and the movable channel 29 is shifted towards the middle part of the form pan.

Horizontal horizontal wheel 21 is horizontal: limiter 23 on the scale and arrow 24.

The pre-tensioned pallet 26 rolls under the device for tensioning the reinforcement until the thrust channels 28 and 29 are located in the plane of the pressure rods of the stop trusses 8, the latter are lowered to the horizontal position by means of the handle 10.

By moving the carriages 27 together with the pallet 26 the push rod of the anvil truss 8 is pressed against the fixed channel bar 28.

Possible gap between the movable channel 29 and push

the core of the stop truss 8 is retired by extending the struts / by screw lugs with the steering wheel 3.

With the help of the strut, the struts / iris are driven to a horizontal position, the movable channel 29 moves and tightens the armature, and then the nuts of the bolts 31 are screwed down to the tight stop 3 of the forks 32. Then the stallion motor turns off and the struts under their own weight are lowered to their original position . The thrust trusses 8 released from the load, under the action of the counterweight 13 and some force on the arms 10, are lifted and the pods 26 are rolled out from under the device for tensioning the reinforcement.

Subject invention

A device for tensioning reinforcement on a pallet of molds in the manufacture of prestressed reinforced concrete structures with the use of paired, angled one to another, articulated struts between themselves, to free spacing when the hinge moves in the direction perpendicular to the reinforcement, to the ends which is attached to a tensioning valve, characterized by the fact that, in order to provide the opportunity to feed and clean the pallets with the fittings laid on them on the trolleys, as well as to simplify the installation of the pallet with armature in the tensioning device, the free ends of the spacers are attached to racks installed on the ends of the device of the transverse portal frames, which are articulated by the lower ends on the base and on which the transverse beams (trusses) in the horizontal plane (lowered ) position to transfer force to the valve from the struts.

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