SU77890A1 - Mobile formwork for reinforced concrete pipes to similar pyramidal structures - Google Patents

Description

The proposed construction of the mobile formwork for reinforced concrete pipes, according to the invention (FIGS. 1-12), consists of the following parts: external L and internal B formwork from metal sliding panels; U-shaped metal frames B with disk screws G and adjusting devices 3; to the frame of the frame D with a scale fixing the magnitude of the displacement of the claims; working site E with internal and external suspended scaffolding; top lifting device for feeding materials.

The outer and inner formwork is assembled from the main and embedded sliding panels. The main panel / (Fig. 4) is rectangular; its frame is a welded frame 2 of corners with two circles placed horizontally in two places but the height of the panel.

The metal sheet 3 is welded to the ralgkke (Fig. 5). On the sides of the lredus panel, additional flaps 4 are seen, which are used with large constructions. In the process of concreting, when they are not needed, they are taken away and the work is done without them.

The metal sheet of the inventory inlay panel 5 (Fig. 7) of the formwork has two vertical ribs 6 in the middle with slots 7 (Fig. 8) for the compensator screws. Plates of rigidity 8 and 9 are welded to the upper and lower edges of the sheet so that the middle part of the sheet 10 (between the ribs) remains free, not rigid. This allows the panel to communicate the desired angle, which is fixed by means of the gussets and bolts 72 (Fig. 10).

The embedment panel can be adapted for the external and internal formwork of the structure. Boxes of external and internal formwork, assembled from basic and mortgage panels, are fastened around the perimeters with a system of compensators in two rows.

U-shaped metal frames (yoke) made of pipes with conventional screw jacks (jacks) to move the form upwards have

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adjusting devices (two on each leg of iok).

The adjusting device (Fig. 12) consists of two brackets 15, welded to the fixing sleeve 16 and to the section of the channel 18 with the nut 17, and four bushings 13, into which two pins 14 with legs are fitted.

The rods with their legs are fixed on the circles of the main panels, and the other two ends are interconnected by a rigid strap 18 (channel), thus forming with the main panel a kind of closed yoke having free movement in the sleeves 19. In the center of the channel there is an opening for free radial pass screw 19, which is connected to the nut and thereby binds the iok to the main formwork panels.

This combination of the main panels with the claims allows:

1) to transfer the thrusting force of fresh concrete from the formwork panels to the Yoki, as well as to break the connection between them, which makes it possible to shift the panels with the help of compensators and thereby radially displace the formwork boxes when the iok is stationary;

2) Move the Yoke to the center of the structure when the formwork is stationary and set them symmetrically to the wall axis.

The control frame is a polygonal metal frame, which is freely positioned horizontally on the cantilever outlets (middle contractions) of the arms from the outside.

With a decrease in the cross section of the structure, the perimeter of the movable form also decreases. But the control frame, due to the rigidity of its structure, retains its former position. This circumstance allows the frame to fix, with the help of special scales, the magnitude of the displacement of the ions and, consequently, to control the size of the shape reduction.

The working platform is a plank flooring along radial wooden beams. His p7g6

With a pad, the platform is pivotally supported on the Yoki, and in the center it is fixed to the beams of the lifting device with a ring and pendants. As the height of the structure increases, the site decreases by gradually removing the flooring along its perimeter.

The upper lifting device consists of two perpendicularly arranged beams hinged on the yoke, with a unit in the center for lifting materials.

The principle of operation of the formwork system consists in the alternation of three actions: reduction of the perimeter (diameter) of the formwork boxes by compensators; jacking up jackies; moving screws by adjusting screws in the radial direction.

The method of operation is schematically as follows.

After laying in the formwork of the upper layer of concrete, the screws of the adjusting devices on the inner legs of the ioke are somewhat weakened, and the perimeter (diameter) of the inner formwork box is reduced by the action of compensators, which somewhat separates it from the concrete.

Then the jackscrews the form goes up. The inner casing of the formwork again adjoins the concrete, while the outer casing separates from the concrete when lifting the mold, forming a gap between the formwork and the concrete.

After that, with the help of compensators, the perimeter of the outer duct is reduced, and the formwork adjoins the concrete again. With a decrease in the perimeters of the outer and inner ducts, a certain radial displacement of the formwork occurs with fixed rocks, which are open-ended asymmetrically with respect to the wall.

Restoring the symmetrical position of the screws is achieved by turning the screws of the adjusting devices.

By fastening the screws of the adjusting devices on the outer legs of the legs, fix the molds for the next round operation.

Subject of the invention Movable formwork for reinforced concrete pipes and similar pyramidal structures consisting of metal sheeting with stiffening ribs, wherein the horizontal stiffeners are split in the middle part in order to be able to bend the shields in the middle part at the right angle.

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