US1445724A - Apparatus for manufacture of concrete tubes - Google Patents

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Mb, 11.11? 12. J. sMbRKovsKv APPARATUS FOR MANUFACTURE OF CONCRETE TUBES Filed Oct. 27 1920 2 Sheets-Sham; 1

K s V O K R 0 K 5 M h w W APPARATUS FOR MANUFACTURE OF CONCRETE TUBES Filed 001;. 27 1920 2 Sheets-Sheet 2 Jh aye/Mar:

tente l 1 a r 'rus roe l w recrun or cotton.

.TUBES.

Application filed 0ctober2-7,1%ll. herialoltlltt.

To'all'whom it my concern Be it known that l, JAnosLAv Snonnovout, a citizen of the Czecho-Slovak Republic, residing at vlilradec Kralove, Czechoslovakia, have invented certain new and useful Improvements in Apparatus for Manufacture of Concrete 'lubes (for which manual labour, nevertheless ll havemade application for patents as fol-- lows, llzecho Slovakia October 18, 1919, and Germany (lot. 28, 1919), of which the following 1s a specificatio My invention refers to reinforced concrete tubes and beams, andimore especially to a device for manufacturing such-tubes and beams. o

Hitherto it was possible to produce only tubes of reinforced'concrete of circular or oviform cross-section which were provided with an annular iron reinforcement. Where longitudinal reinforcin members were employed, the longitudina rodsonlyserved for stiffening and distributing purpose without being required to receive the inner stresses arising in consequence. of axial bendtaken asunder and which only allowed of making pieces of limited length, the tubes consequently being employed merely for purposes of sewerage and the like,.any other use beingimpossi'ble owing to the tubes lacking a suitable longitudinal reinforcement and having only a limited length.

.'lhe manner in which the transverse reinforcement was formed, has been perfected by Warious arrangements, but there always remained the necessity of ramming the con- .crete', such ramming either taking place by manual labour or by simply pressing a screw thread'throu h the concrete material, this latter metho although being quicker, than eing unfitfor achieving a correct compression of the concrete or a reliable setting of the concrete anznmd the iron.

My invention renders it possible to produce by machinery tubes or beams of reins forced concrete of. any desired shape and length in an extremely economical manner without employing special moulds, the tubes or beams'being' provided with longltudmal and transverse reinforcements corresponding to the inner stresses, so thatthey can not only be employed as tubes for'sewerage and water conduit piping whicharo sub-1 ject only to radial pressure or tensile strains,

but also as structural elementsof any kind 7 (such as beams, poles, pillars and the like) 1 required to be capable of withstanding bendtll stresees.

1"therto it has been necessary to producesuch constructions ,;provided 'with a longitudinal reinforcementand intended to serve as beams, poles, pillars and the like, by 65 manual labour, and this either in an expen-- slve and complicated mould or in expensive metal mouldsadapted to be taken to pieces, the. reinforcement constructed in advance,

being inserted in the moulds, after which 7t the ramming of the concrete by hand was commenced, a considerable" loss of time ensuing from this method which was moreover very imperfect, in consideration of the complicacy of the iron skeleton inserted Wt forming an obstacle in the way of correct ramming. e finished concrete bodies could not be removed from the moulds until the material had set. J

In the drawings ttached to this s ecificaat tion andiforming part thereof, a mac ine for carrying my invention into practice is illustrated by way .of example. In the drawmgs Fig. 1 is a longitudinal section,

Fig- 2 is a side-view d Q Fig- 3 is a plan of, the machine.

Fig. lis adetail. l

Referring to the' drawingathe concrete is fed to thecharging funnel 1 which may at be rovided with a conveyor worm, and pro cee s from the latter to a eating 2 containing a conveyor worm-3 whichmoves the concrete further and eomg esses it The conveyor worm is elongate which determines .the size of the hollow interior of the y tohe produced. The concrete material is forced into. the intermediatespaceformed between the core mandrel 5 and"the mouth piece 6 of the. let

press by the worm,-3; r

,The outer surfof the casing .2 is provided with longdtudinaljg'rooves 7 in which the iron wires or rodsjfi are inserted" before commencing topre'ss the ehncrete, the 105 insertion of the said-wires'jhein efiected in such a manner that the ends of t e rods ro-' ject a little beyondthe edge fof the casing 2.

In order to ensure the reinforcement being drawn along by the concrete material in no the beginning, before hothrof them arrive in the opening of the mouth piece'reduced in "toforma mandrel 4L, 5 he size by the full diameter ofthe mandrel, a

frame 21 of wood or sheet metal which fits into the cavity of the mouth iece, is em-- ployed, the holes contained in this said frame being slipped over the ends of the longitudinal reinforcements and the frame itself then being attached to the wires-by means of nuts or in some other suitable way.

Simultaneously the projecting ends of these wires or rods 8 are fastened together with the beginning of the spiral reinforcethe unwinding of the wire, so that in this manner only just suflicient wire is unwound as is required for the helical'winding on the straight wires 8.

The wire 9 is taken over a chute 13 or a roller attached to an arm 14;, in order to facilitate the entrance of the wire 9 into the cylinder 2, the arm 14 being screwed firmly into the cylinder 12.

The cylinder 12 has a rotary motion produced by the toothed wheel 15 which I is keyed onto the cylinder 12 being rotated simultaneously with the conveyor worm 3. The toothed wheel 15 as well as the toothed wheel 16 which is keyed on to the shaft of the worm, engage with corresponding toothed wheels of the back gear shaft, the

' axis of which may be arranged 'in parallel and 4); owing to these.

. in the opposite direction to that of the with the axis of the worm in such a manner that the wheel 16 is made to engage directly, with the wheel 17 of the back gear'and indirectly, under interposition of the wheel 18, with the wheel 19 of the back gear, 'all this for the purpose of achieving a rotation on the part of the cylinder 12, which is contrary 'to'the rotation of the worm 3. The rotation of the cylinder 12 also results in a rotation of the arm 14 withthe chute 13, the wire. 9 thus being wound around the wires or rods ,8. In the place where the windings of the worm 3 cease and where its .axis passes into the mandrel, the ace throu h which the concrete materia is mov forward, is enlarged.

This space contains helicalvanes 20 fitted at the head end of the cylinder 12 (Figs. 1 ide vanes rotating worm, an moreover owing to their being arranged in the vicinity of the inner circumference of the mouth piece, the concrete is pressed straight. into the cavity of .the mouth-piece over the whole of its cross-section, thus achieving a reliable envelopment of the iron reinforcement by the concrete and simultaneously counteracting the twisting of the concrete as well as of the iron reinforcement carried along by the material.

When the concrete is forced into the cavity of the mouth piece by the rotation of the worm 3 and of the vanes 20, the concrete presses against the frame 21 which is connected with the wire reinforcement (Fig. 4), and carries the said frame forward, together with the reinforcement in continuing its (own forward motion. As soon as the concrete then reaches the space, the cross-section of which is reduced by the full crosssection of the mandrel, the reinforcement is also pressed into the concrete with such a force, owing to the powerful compression of the'concrete, that the further carrying along of the straight wires lying loosely in the longitudinal grooves, as well as the spiral reinorcement which takes place automatically, is now continued undisturbedly solely on the basis of the adhesion between the concrete and the iron.

It results therefrom that the concrete pressed into the mouth piece by the convcyor worm progresses continuously with the formation of the reinforcement 8, 9, the initial movement of the straight wires and of the spiral reinforcement rigidly connected therewith, being called forth by means of a frame 21 rigidly connected with the longitudinal reinforcement, whilst the further forward movement of the two reinforcements. is ensured in consequence of their being pressed tightly against one another owing to the firm compression of the concrete.

I claim:

1. In a device of the kind described in combination a conveyor worm, a casing surrounding said conveyor worm, a mouth piece of substantially annular section connected with said casing, grooves in the walls of said conveyor worm, for guiding reinforcing wires in parallel with the worm axis and means for windin a wire spirally around said reinforcing wires before their entering said mouth piece.

2. In a device of the kind described in combination a conveyor worm, a casing surrounding said conveyor worm, a mouth piece of substantially annular section connected with said casing, grooves in the walls of said conveyor worm for guiding reinforcing wires in parallel with the worm axis, a cylinder adapted to rotate coaxially with, but in a direction opposite to that of said worm, an arm extending from said cylinder and means for causing a wile guided by said -arm to be wound spirally around said reinforcing wires before their enteringsaid mouth piece. I

3. In a device of the kind described in combination a conveyor worm, acasing surwear/ea rounding said conveyor worm, a mouth piece of substantially annular section connected With said casing, grooves in the walls of said conveyor worm for wires in parallel with the worm axis, a cylinder adapted to rotate coaxially with, but in a direction opposite to that of said Worm, helical vanes on the free end of said cylinder, an arm extending from said cylinder extending into said mouth piece and means for causing a Wire guided by said arm to be wound spirally around said reinforcing wires before their entering said mouth piece.

4. In a device of the kind described in combination a stationary casing means for feedingplastic material into sald casin a worm adapted to rotate within said casing,

guiding reinforcing a movable c"linder adapted to rotate on and around said stationary casing in a direction opposite to the direction of rotation of said worm, a mouth piece on said stationary caslng, a mandrel forming a continuation. of;

lrally around said straight wires before their entering said mouth piece.

In testimony whereof ll afix my signature.

JARUSLAV SKURKOVSKY Witnesses:

MmosLAv Hauler,

CALLAHAN.

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