Патент USA US2109421код для вставки
' Feb. 22, 193s. qc; HALKYARD . ' MoLnENE oE coNcEEEE PIEEs AND TEE LIKE Filed May 2e, 19:54 2,109,421 Patented Feb. 22, 1938 - ' ' . ‘l UNITED STATES PATENT oFI-?IcE ` MOLDING "0F CONCRETE PIPEs> AND THE ‘ _LIKE a Charles Cyril Iialkyard, Melbourne, Australia, , assigner to Hume Pipe Company (Australia) ‘ Limited, Melbourne, Australia _ _ l . _n i‘ ` Application May 26, 1934; Serial No. 727,817 I ‘ In Australia June 15, 1933 ’ x . _ ~ 7 2 Claims. v (Cl. 25--30)` This invention relates to the molding of con- tially Compacts >Seine in its-ennuie? ÍOI‘In. The crete pipes and the like including the lining of screeding member .is then removed and the mold metal or other pipes with concrete >cr like mate- or fcasing is” subjected to` combined centrifugal rial. w 5> The speciñcation of UnitedStates Patent No. and jolting actions by means of a suitable appa ratus provided for the purpose. I v g 2,023,381 describes a method and'apparatus ac- It has been found that by retaining the screed ccrding to which the molding‘and lining of pipes with concrete is'effected by subjecting thecon- ing member Within the InOld during the initial rotatiOn and Charging thereof, the Subsequent combined centrifugal vand jolting process causes crete mixture in a semi-dry or non-liquid'state 10 simultaneously to centrifugal force and to a pro- ` nounced jolting or ccncussional action within a rotating mold or casing which is intermittently and abruptly projected upwardly from its normal position of rotation and returns forcibly 15 thereto during such rotation. In accordance with the abovementioned process, the mold or casing is initially rotated with- 5 the distributed and partially compacted semi-,dry 10 Concrete mixture to be uniformly’and effectively Consolidated throughout the length and Circum ference of the mold. Furthermore, relatively Small quantities 0f the Semi-dry material may be introduced and compacted where necessary to 15 ‘fill up any depressions or inequalities in the inner surface ofthe concrete pipe 01‘ lining. In out the jolting a’ction whilst the concrete mix- this respect, it has been found hitherto that any v ture is being fed into the mold. such additional material which may be intro Owing to its 20 semi-dry or non-liquid consistency, the concrete duced for thisgpurpose tends to remain loose 20 is not capable of flowing or spreading longituaround the interior of the pipe and forms a rough 'dinally within the mold as is the 'case when the or irregular surface. concrete is employed in the usual liquid or semi- ' Referring to the drawing which forms part of liquid state in the molding of concrete pipes by this specification- . » c the centrifugal-process. For this'r'èason, it is Y Figure l is a longitudinally contracted side 25 'necessary to evenly spread or distribute the elevation of apparatus according to one embodi semi-dry material into annular form within the , ment of the invention. mold before subjecting it to the aforesaid comFigure 2 is an end view' of Figure 1. l bined centrifugal and joltlng action. >Such even In the drawing the numeral 2 indicates a mold. 30 spreading or leveling of the concrete is essential provided with the usual endrings 3 which nor- 3o " - Vgto the production of a pipe of uniform diameter y ' _and thickness and maximum density. mally rests upon runner wheels 4 mounted on c r’ shafts 6 supported by bearings l on a framework 'In accordance with a preferred form of the invention, a screeding or leveling member, con35 sìsting of a straight length of tubing or' circular section bar, is placed in position within the mold or casing so as to extend longitudinally therein prior to the charging of the mold with the con- 8. Suitable means, such as disclosed for instance> in prior United States Patent'No. 2,023,381, may be provided to impart pronounced jolting or con- 35 cussional action to the mold while it .is -being rotated at high speed by the runner wheels I. In Figures l and 2 the screeding member is crete mixture. Whilst the screeding member is 40 held in position either manually or by suitable shown in the form of a straight tube 9 which , extends completely'through the mold and is sup- 40 mechanical means as hereinafter described, the ' ported so as to be spaced slightly inwards froml material is fed into the mold which is rotated at a relatively low speed, the result being that the the usual inwardly projecting flanges 3a of the mold end rings 3. Supporting means for the semi-dry material is evenly spread or distributed screeding tube may include pairs of ` laterally 45 by the screeding member into substantially an: nular form throughout the length of the- mold. - l spaced end brackets il' secured to framework 8 454 and carrying laterally extending sub-frames I2 When substantially the whole of the charge of . t0 which upstanding arms or bearers I3 are re concrete has been thus introduced into the mold and initially spread therein by the screeding 50 member, the latter is allowed to’rotate while vthe rotation of the mold is continued at' relatively low speed. whereby the leveling and pressure member exercises rolleil pressure simultaneously upon the entire length of the charge and ensures 55 uniform distribution of the material and pai‘- tained. These bearers are preferably vertically adjustable and for this purpose may havea ver tical slot I4 or a> series of vertically spaced holes 50 to pass bolts I6 which retain them to the sub frames l2. ' , ` f Each bearer is provided atlits upper end with a plate ll having an open sidedrecess I8 of ap _proximately semi-circular shape to accommodate `55 ' 2 2,109,421 the screeding tube 9 so that it may rotate while bei-ng supported in operative position. With drawable stop pins I 9 or collars may be asso ciated with the screeding member 9 to prevent Ul endwise movement thereof' when in operative position. The screeding tube is placed'in operative posi tion as in Figures 1 and 2. The semi-dry or non ilowing material is introduced into the mold 10 and the latter. is rotated in the direction of the arrow in Figure 2. The recesses Il of the plates Hare so disposed relative to the direction of ro tation of the mold that the contact of the screed ing tube 9 with the material within the rotating mold maintains the tube within the' recess while enabling it to rotate and exercise a rolling- action ' member, and means for supporting same where by it extends lengthwise from end to end within the mold in spaced relationship with the internal surface thereof so that, during rotation of the mold, the leveling and pressure member exercises 5 a rolling action upon the mixture in order to evenlyspread or distribute it lengthwise and cir cumferentially .throughout the mold into the form of a partially compacted annulus ready for consolidation by combined concussion and cen 10A trifugal actions, the supporting means for said levelling and pressure member comprising up standing arms or bearers located one at each end of the mold Aand provided with seatings for de tachably receiving said member, said seatings being provided with open-sided recesses for ro upon the material which facilitates distribution -\ accommodating the end portions of the and initial compacting of the material. After tatably member. . » the material has thus been distributed the screed 2. A_device of the character described, com ing tube may be withdrawn lengthwise from the mold and the latter then subjected to combined prising a rotary mold, a supporting frame, means 20 jolting or concussional and centrifugal actions as on said frame for supporting and rotating said before -referred to to complete the‘manufacture mold about a horizontal axis to centrifugally ap ply a concrete mixture to the interior thereof, a of the pipe or lining. Having now described myv invention what IA claim as new and desire to `secure by Letters Patent is- „ ' - 1. In apparatus for use in the manufacture or lining of pipes from semi-dry or non-flowing con` crete mixture, a rotary mold, means for rotating the mold to centrifugally apply the mixture to the n interior thereof, a rotary leveling andpressure rotary pressing- and leveling member extending longitudinally- through said mold, a support for said member positioned at each end ofthe mold, each support comprising a seat for >rotatably ac commodating -the end portions of said member and provided with an open side for the >introduc tion and removal of said member, and means for 30 adjustably securing »said supports to said frame. . ‘ C. C. HALKYARD.