US 1647925 A
Description (OCR text may contain errors)
Nw. L W2K 4 @42925 .L W. MAY
ANCHOR FOOTING FOR STEEL TOWERS Filed April 25, 1925 Patented Nov. l, 1927.
FFlCw JOHN WALTER MAY, OF KIRKLYN, PENNSYLVANIA.
ANCHOR FOOTING FR STEEL Tol/VERS.
Application led April 25, 1925. Serial No. 25,759.
This invention relates primarily to the foundations for fabricated steel towers ci" high tension electric transmissionlines, and the principal object of the invention is to provide a novel term of anchor and footing consisting or' a number of comparatively small and precast elements adapted il`orasseinbly in the ground hole prepared for theirr reception, and providing when assembled a combined anchor and rooting answering all the requirements.
The invention has a particularly important aspect in the erection of towers in re mote or mountainous districts where raw materials ior the commonly used monolithic concrete anchorages are not available and dittic'ult to transport from available sources. With this in view, the invention contemplates the provision of a sectional precastJ anchor footing which may be transported with the steel parts of the tower without diiiiculty and are capable of erection without the use or water or other raw materials commonly required for this type of structure.
ln the attached drawings:
Figure l is a vertical section showing in position an assembled anchor rooting made in accordance with my invention;
Fig. 2 is a sectional plan view of the anchor footing on the line 2 2, Fig. l, and
Fig. 3 is a plan view of the base block ot the footing.
wWith reference to the drawings, the structure comprises a base l which may be of any i'orm desired and which in the present in stance I have illustrated as circular, this being the form preferred. rThis base is preferably made of concrete and has cast in the center thereof and projecting above the top surface a metal socket 2 for a. steel anchor rod 3 whose lower end is in assembly threaded into the said socket.
rlhe anchor-footing further comprises one or more hollow concrete elements a which in the present instance are annular in form and which are adapted to be mounted one above another upon the base l to form a truncated conical section immediately above the said base. In the present instance, two of these elements l are employed, although it will be understood that there is no li1nitation as to their number.
The anchor-footing further comprises a plurality of hollow concrete members 5 so constructed as to be capable of mounting one above the other from the top .of the aforesaid conical lower section, as clearly illustrated, these sections 5 being in the present instance annular in shape and four in number with the upper section extending above the ground surface, designated by the reference numeral G.
In order to bind the sections ytogether and to the base l, each ,of the sections l and is provided atjone edge, in the present instance the bottom, with a tongue or other suitable projection 7, and on the other side with a correspondingly formed groove or recess 8 whereby the projection 7 ot' one section may rit within the corresponding groove of the section which it abuts. In the present instance, the base l is provided with a groove or recess 9 for the reception of the tongue 7 of the bottom section 4l.
rlhe anchor rod 3 is of such length as to project above the topmost section 5, and a metal bearing plate l0 having a central aperture through which said rod projects rests upon the top of the upper sect-ion 5 of the concrete structure and constitutes a base for the leg of the steel tower designated by the reference numeral l1. As shown', the top ci the anchor rod passes through a suitable recess or aperture in the bottom or' the tower leg, and a nut 12 binds the said leg to the anchor rod and to the anchor-tooting, and also, through the said rod, binds the parts or elements of the anchor-footing together.
in establishing these anchor-footings, it is only necessary to dig a hole of sutlicient depth for the purpose and oi' such size as to receive the base l. The sections 4land 5 are thereafter lowered into place one by one until the entire structure is built to the surface or the ground. The earth is then filled in around the structure thus formed, and if desired, the interior of the hollow anchor footing may also be filled with dirt or stone around the anchor rod.
rlhe sections 4l and 5 and the base plates i are of such size as to be easily transported with the materials of which the tower isy damage to thelcementhas madesuchopera: tions extremely difficult: By my presenty invention, I have provided an entirely practicable and easily constructed anchon-foot.- ing Whose relatively 'small' componentY parts are easily transported with nomore trouble;A
than the transportation of the other materials and metal parts of Whichtfhe-tower ist built.
f M-y structure; hasaI further advantage, in:
that it may: bev used asisoonas; built, there being no requirement., asin monolithic con-V cretefanchors,` for time toallow'. the-structure= to set.'
vVVhile otheranchor ootings *haven been suggested, employing metal; which possess to *somef extent the advantageous assembly and transportation featureslof-"my structure,- the relative advantages ofi-concrete-y over met;
al for/.thiapurposevare WelLunderstood, and
Vit willbefnotedithat my, anchorage partakes rodJseour-edin saidkbase block andexlending' upwardly through'` the assembled: sect-ions,v and :al bearing plate resting upon the top ofthe-upper section and: having an openingz,r lor. said .tie rod.`l