SU81103A1 - A centrifugal method of manufacturing prestressed reinforced concrete pipes, hollow beams, columns, piles, etc. - Google Patents

Description

Centrifugal methods are known for the manufacture of reinforced concrete pre-stressed pipes, hollow beams, columns, piles, and so on, with pre-winding of reinforcement in a stressed state on a cylindrical element, which is then inserted into the drum.

In the proposed method, with automation, a cylindrical element with reinforcement reinforced on it is left in the drum for the time of centrifugation and removed from the drum along with the manufactured tube, and the element for reinforcing the tension reinforcement is made in the form of a through frame the possibility of passing concrete to the inner surface of the drum.

 The advantage of the proposed method of concreting hollow products over others is that, due to the separate reinforcement and concreting, these processes can be carried out automatically on machine tools.

FIG. 1 shows a side view of the structure before installing the longitudinal reinforcement n with the reinforcement installed; in fig. 2 - end view; in fig. 3-longitudinal section of the centrifuge in the manufacture of piles; in fig. 4 is a cross section of a centrifuge in the manufacture of piles; in fig. 5 and 6 - detail wedge clamps of the ends of the valve; in fig. 7 and 3 is a side view and cross section of a centrifuge in the manufacture of stringed concrete pipe.

In the manufacture of reinforced concrete piles around pegs 1 mounted on the end washers 2 of the cassette, longitudinal reinforcement 3 is wound around. The two ends of this reinforcement are fixed on the cassette using wedge clamps 4 or in some other way.

No. 81103 2 -

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Socket Freely put on the strut, perceiving the reaction from the tension of the valve. The strut consists of steel tubes about connected between 1 and 2 diaphragms of rigidity 6. Before assembling the cassette and installing it on the winding machine, the pile shoe 7, which is a section of pipe welded to it, is put on it. The shoe 7 is concreted with the pile. A cassette with fittings 3 pulled on it and shoe 7 is inserted into the drum of the centrifuge 8 and fixed there.

In order to prevent the concrete from pouring out, wooden washers 9 are inserted between the end washers 2 and the inner surface of the drum 8 of the centrifuge. After inserting the cassette inside the centrifuge, they start concreting and then pressing the laid concrete 10. cassettes through its ends when turning the centrifuge at a speed of about 200 rev / min. After concreting, the rotation speed of the centrifuge is increased to 800 rpm, as a result of which the concrete is pressed and water is squeezed out of it.

Pressing takes 10-15 minutes. In order to raise the concreted tube from the drum 8 as the centrifuge is rotated, a layer of paraffin several millimeters thick is applied to the inner surface of the drum before insertion of the cassette in hot form. At the end of the pressing process, the centrifuge drum, along with the tube and the cassette, is placed in the steam chamber. Under the action of high temperature, paraffi} (it melts and flows through a special opening into the vessel, and the pile, together with the cassette, is freely removed from the drum and sent to the warehouse for the concrete to fully mature.

The centrifugal drum 8 may not be made in the form of a single cylinder, but detachable, parts of which are bolted together. In this case, to release the pile, the centrifuge drum 8 is split apart and no refining is required.

The production of tightly reinforced concrete pipe pressure pipes is also proposed to be carried out using the cassette described above.

The only difference is that before winding the spiral reinforcement along the struts, longitudinal concrete bars / / are made of reinforced concrete, subsequently included in the cross-section of the pipe. Pre-stressed spiral wire 12 is wound along these bars, which is located not along the circle 5 but along the polygon. Reinforced concrete bars L are reinforced with conventional reinforcement without prestressing, which then plays the role of distribution fittings. After installing the bars // and tensioning the spiral ardmatura. the cassette is charged into the centrifuge drum, where concreting is carried out using the proposed method.

Subject invention

Claims (2)

1. A pentropubic method of manufacturing reinforced concrete pre-stressed pipes, hollow beams, columns, piles, etc., with pre-winding of reinforcement in a stressed state on a cylindrical element, which is then inserted into the drum, characterized in that In this case, the reinforcement is left in the drum for the duration of the centrifugation and removed from the drum along with the manufactured tube. 2. Device for implementing the method pop. 1, characterized in that the element for reinforcing the tension reinforcement is made in the form of a through frame made up of cylindrical rods with the cylindrical surface named for them to be able to pass concrete onto the inner surface of the drum. //