SU116561A1 - Portal swivel device for tensioning reinforcing beams on stands for spans - Google Patents

Description

The known similar devices have a complex structure, perceiving the vertical reaction that occurs when the tensioned reinforcement beams are bent and do not ensure uniform tension of the curvilinear beams.

In the described device, these drawbacks are eliminated by making it in the form of three frames forming a hinged triangle, on the sloping side of which bent beams are located.

FIG. 1 shows a perspective view of the device according to FIG. 2, 3, and 4 are the stages of tensioning the reinforcement using the proposed device.

A portal-rotary device for tensioning reinforcing beams on stands for manufacturing spans consists of three frames — a horizontal 7, serving as a base, an inclined swivel 2 li, a vertical 3, forming a hinged triangle.

The frame / is the base of the device (base), freely laid on the deck deck bench, moved by tensioning the reinforcement using inventory beams and consisting of two longitudinal hollow rods 4, rigid connecting them to the transverse crossbar beam of 5 ir thrust semi-portals 6. Beam 5 and the semiportals 6 are lifted over the stand of the tube in such a way that below them in the space between the rods 4, the reinforcing beams of the lower structure of the superstructure could be missed.

To bend the beams between the semiportals 6, a retaining liner 7 with holes for the lateral rods 8 is inserted and secured to them. Inventory rods are missed inside the rods 4, 9 with loops 10. fixed by anchors 11 are missed. ;; sariirno connected to the frame / s in; 1 mass of 1; U wrench around the axis 13

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The crossbar) of the frame 2 is made in the form of a balancer 14, which rotates around an axis 15 in order to maintain, during the bending, the stresses achieved in tension, in the bent beams.

The ends of the rods 12 of the frame 2 have directional sheets, sheets that slide along the branches of the vertical frame 5, which are used to secure the traction devices during tensioning of the beams of the upper flying structures.

Traction device / 6 by means of pins 17 is fixed at one or another necessary height from the deck of the stand, depending on the size of the manufactured block.

The traction device consists of a support beam 18, two hydraulic jacks} 9 and a support beam 20 with a fascia sheet 2 fixed in it, which can move freely in a groove arranged in the support beam 18. Operating beams of the upper end loops are subject to tension through the fingers 22, they are attached to the sheet 2. The tension of the beams occurs when the support beam 20 is moved. Thus, the sheets 21, pulling into the groove of the support beam 18, tighten the reinforcement beams. The tensioning reaction through the jacks, the support beam and the frame 3 is transmitted to the stop at the ends of the rods 12 of the frame 2.

The described device is intended for the manufacture of prestressed bridge superstructures with bent into the wall and upper reinforcing beams on existing stands, which are adjusted to tension only straight reinforcing beams at the bottom level.

The process of fabricating prestressed spans using the proposed device is as follows.

Two devices are mounted on the deck of the stand (the inclined pillars 2 are lowered down) in the position shown in FIG. 2. The straight reinforcing beams of the lower belt are passed between the rods 4 of the frame / and fixed to the tension devices of the stand in the usual way (these beams are not shown in the drawing). The lower legs of the bend, which are subject to bending, are fastened with end loops in the balancers 14; inventory beams extending from the stand tensioning devices are connected to the loops of the inventory beams passing inside the rods 4 of the frame. The loops of the upper beams are attached to the sheets 21.

The working jacks of the stand are turned on, and both the straight beams of the lower wean and the beams to be bent are pulled. The achieved voltage is fixed by placing the embedded rings on the pistons of the working jacks.

The inclined frames 2 by a bridge crane or a winch with tap-off units rotate to a predetermined angle (Fig. 3). When this occurs, the bend of the beams by bending on the embedded rods x 8 thrust liner 7.

Tension of the upper reinforcing beams is performed, and the reaction is transmitted through the support beam 18 - and the frame 3 to the ends of the rods 12 of the inclined frame 2 (Fig. 4). Formwork is installed, concreting and steaming is performed. When the concrete block sets up the required strength, the load is removed and the concrete is pre-compressed, after which the devices are removed and the finished block is moved by a transverse movement from the stand.

Subject invention

Claims (2)

1. Portal swivel device for tensioning reinforcing beams on stands for manufacturing spans, characterized in that, in order to eliminate complicated devices for perceiving the vertical reaction of stretched bent beams, it is made in the form of three frames forming a hinged triangle, on the sloping side of which bent beams are located and whose vertical reaction is not perceived by the bench. 2. The form of implementation of the portal-rotary device according to claim 1, characterized in that, in order to tension the reinforcing beams with their horizontal arrangement immediately to the design value and subsequent bending without causing additional tensile forces in them, one of the frames hinge triangle, made the turn.