US1586085A - Footing for structural elements - Google Patents

Description

H O HILL FOOTING FOR STRUCTURAL ELEMENTS Filed May 5, 1924 May 25 1926.

IIID L@ Patented living ag E "vi e Uit t rata MANUFACTURING COMPANY, OF LEETSDALE, PENNSYLVANIA, A CGRFORATION OF PENNSYLVANIA.

FOOTING FOR STRUCTURAL ELEMENTS.

Application flied nay 5,

This invention is for a footing or ground anchor for structural elements, such for instance as structural metal transmission towers.

In the erection of power transmission lines, it is necessary that the transmission towers be well anchored and have a goed footing in the ground in which they are erected. One common form of ground anchor for such towers comprises a grille made of several spaced apart beams having wide bottom flanges. Y In soft earth.y such a footing may cut through the earth, the spaces between the beams permitting of this. Consequently, the footing may rise or lower from the position in which it is set. Another serious disadvantage of this kind of a footing is the excessive amount of steel that has to be used, and which serves no other purpose in the footing than to provide a wide surface to resist movement in the earth. This steel not only increases the initial cost of the tower, but also is a big item in transportation costs.

Concrete footings for the tower are frequently used, but, due to the distance covered, and the condition and character' of the country traversed, it is very expensive to haul the materials used in making the con crete, it generally being necessary to even haul the water, as well as the implements or machinery, and labor for mixing the concrete. Consequently, here is a trend in favor of the structural steel anchor. Y

The present invention purposes to provide a structural metal anchor in which is received suitable slabs, such as ready formed reinforced concret-e blocks, this anchor having far less metal therein than the usual metal grille anchor, and providing` a solid supporting` and resisting surface that prevents the anchor from cutting through the ground.

This arrangement permitting, as it does, of far less steel being use-d, greatly decreases transportation costs. The reinforced concrete slabs can be readily formed at a conveniently located point and carried into the field with the other parts of the tower. Its great advantage, however, other than the saving of metal and transportation costs, is in the improved anchorage which it provides.

The invention may be readily understood Fig. 7 is a diagrai'nn'iatic view indicating a type of tower with which the invention may be used.

In the form of invention shown in F igs. l and 2, the footing comprises two parallel channel irons 5 having their channels turned toward each other, and midway between the two is a length of I-beam 6. These three structural members are connected by transverse structural bars 7, between which is secured a short' vertical I-beam or other suitable upright 8, to which a stud or tower leg or other structural element 9 is secured.

The channels on each face of the I-beam and on the inner faces of the channel bars provide a guideway into which a slab or block 10, preferably formed of reinforced concrete, may be slid and retained in place, In order that the bloclr need not be needless ly heavy, the body of the block is relatively thin, but ithas flanges 10a of sufficient height to fit snugly in the channels.

In the modification shown in Fig. 3, the

v parts are generally similar, and corresponding reference numerals have been used. In order that the slab 10 may be perfectly fiat, however, angle bars l1 are secured to the sid-e faces of the I-beam 6 and the inside of the channels 5, thereby providing narrow guideways or flanges to receive or confine the edges of the slab 10, which slab is of substantially uniform thickness.

In the form of invention shown in Figs. 4 and 5, the same principle is followed, but there are merely two parallel channel bars I2 in the footing turnedtoward each other,

the central I-beam of the Fig. 1 construction being omitted. The transverse connectinfr beams are indicated at 13, and I4 is the upright to which the leg or stud 15 is se'-1 cured. The slab is designated I6 and, in n Fig. 5. is shown as having side flanges lil" to inalie the edges of the bloc-l1: suliiciently thick to be retained in the channels.

ln Fig. (la the slab l5 is of subst: Titia.. uniform thickness, but longitudina l tending angle bars l? are seen-.red to th io receive the edges of the slab.

In Fig. 7, l have shown diagrammatically, for the Ypurpose of illustration, a transnns- Sion tower 18 having footings enibodjfing the construction outlinec, and showing the adaptabilityY of the invention to transmission towers. However, l do not confine inyfelf to the use of the invention for transin .orion towers alone, as it is equallj,y applicable to other structures. Further7 various cha and inodiications may be inade within the conten'iplation of iny invention.

Frein the foregoing, it will readily be seen that, when the slabs are in the anchor construction and the entire assembly is in the ground7 a reinforced concrete footin is provided having a large soli-l area over which the downward and upward strains are distributed.

Due to the fact that the slabs may cover :i fairly wide span7 the supportilg beains may be snaced relatively far abart and a great saving of inetal is the eby effected over similar anchors forlned of a large nurnber of spaced-apart l-beains with wide bottoni langes. Such a construction, furthermore, improves the footing because of the fact that the spaces between the bezuns l'jeing filled in, it is not possible for the anchor to cut through the earth.

l claiin as iny invention l. A footing for striietural elements coinprising a pair of connected ineinbers hiving guideways therein, and a concrete slab adapted to be s'd into position between said inelnbers and having its edges received in the guideways.

Q .A footing for structural elements coinprising a pair of flanged structural beams, the flanges of which e); ,nd toward each other. a slab haring a relatively large area to receive the down-.v d and upward strains of the structural cleui .its and interposed between the hean'is and retained in position by the flanges thereon, and ineans connecting the structural beams.

f 3. it footing for structural elements co1nprising a pluralityY of spacer apart structu al bean'is having oppositely disposed flanges thereon, ineens connecting the structural beanie together, and concrete slabs having upper and lower contacting surfaces of relatively7 large area for contact with the earth interposed between the spaced apart eleinents, said slabs cooperating wit-h and being retained in position by the flanges on said beams.

il. A footing for structural elements coinprising a pair of para llel spaced apart struetural beains each having spaced apart flanges thereon turned toward the flanges of the other, a guideway being forined between the flanges on each beani, a reinforced concrete slab having large contacting surfaces for Contact with t-he earth ttor resisting moveinent in the earth interposed between the beams having its edges received in the guideways, and ineans connecting the beains.

5. footing for structural elements coinprising a pair of parallel spaced apartV structural beains each h aving spaced apart flanges thereon turned toward the flanges of the other, a guidewaT being formed between the flanges on each beain, a reinforced concrete slab having large earth contacting surfaces interposed between the beanis having its edges received in the guideways, cross bars connecting the parallel beains, and an upright connected with the cross-bars.

ln testimony whereof I aliii; my signature.

HAROLD O. HlLL.

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