US1179121A - Revetment composed of flanged units. - Google Patents

Description

J. IVlGILLIVBAY.

REVETNIENT COMPOSED 0F FLANGED` UNITS.'

APPLlc AAAAAA ILED MAY 26, 1915.

1,179,121. 1 Patentempr. 11,1916.

THE COLUMBIA PLANOGRAPH co WASHINGTON, D4 c.

STABS REVETMENT COMPOSED OF FLANGED UNITS;

Specification of Letters Patent.

Patented Apr. 11,1916.

Application filed May 26, 1915. Serial No..30,482.

To all whom t may concern:

Be it known that I, JAMES MCGILLIVRAY, a citizen of the United States, residing at Sacramento, in the county of Sacramento and State of California, have invented certain new and useful Improvements in Revetments Composed of Flanged Units, of which the following is a specification.

This invention is in the nature of an improvement upon revetments such as patented to me September 29, 1914, No. 1,121,018 consisting of an apron or mattress composed of reinforced concrete slabs or units joined together to cover the bank or levee to be protected. It is intended to meet the following difficulties on sand levees, namely: Waves from passing boats or from strong winds sweep up over the mattress and percolate through the joints between the units and then follow down just beneath them to lower` joints where the waves in receding form a suction which drawsfout the sand and in a short time an excavation is formed under the mattress which gradually enlarges thereby allowing a section of the units to sink and so rupture the mattress. This is particularly the case where through some fault in tying or other cause the units are not brought close together.

In the present invention pockets are formed for the retention of sand or gravel over the joints between the units whereby water cannot pass through and undermine the revetment.

The invention therefore consists in the formation of parts and in their combination for the purpose stated substantially as hereinafter set forth and claimed.

In the accompanying drawing which forms a part of this specification Figure 1 represents the cross section of an embankment upon which the improved mattress is seen in edge view; Fig. 2 is a plan of one of the units of the revetment; and Fig. 3 is a perspective view of such unit.

rIhe embankment or levee is indicated at 5 in Fig. 1 and the units of the protecting mattress at 6. Said units are in the form of oblong rectangular slabs each provided along its upper longitudinal edge with an upwardly projecting flange or rib 7. Each slab is provided with holes 8 extending through it near the corners and with a groove 9 along one or both ends to receive the anchoring cables 10. The slabs are tied together at their ends across the cables and thereby connected to the cables which are confined in the channels formed by the grooves 9. The cables may be anchored at one or both ends, here shown as anchored at the upper end to dead-man, l1, the lower end having a washer 12 secured thereto at the edge of the lower slab.

The flange 7 is formed along the upper edge of the slab which edge'may be flat while the lower edge is preferably convex to allow the slab to fit its neighbor closely and still permit adjacent slabs to lie in dierent planes so that the revetments may conform closely to the surface covered.

The flanges of one row of slabs form a pocket with the row above which is filled with sand and gravel 111 to protect the longitudinal joints between the slabs and also the transverse j oints. With said joints thus covered the water washing up and down the revetment cannot findy its way through to theI underside. Covering the oints thus also greatly reduces seepage. The flanges also greatly retard wave action thereby lessening the height to which these revetments need be built.

To insure greater durability in these slabs,

which are necessarily heavier than the plainv flat slabs of the patent referred to, the reinforcing member 13 of each is not only carried completely around the holes 8 and extended from hole to hole, but it is also carried from the outside of one hole to the outside of the next along the side of the slab and out from the holes into lthe corners of the slab and close to and along the ends of the slab whereby theedges of the slabs are strengthened as well as the walls of the holes.

The invention claimed is:

A revetment composed of concrete slabs united together at their edges to cover the surface to be protected, said slabs having flanges integral therewith extending along their upper edges and projecting above the surfaces of the adjacent slabs above them whereby said flanges together with the slabs above them form sand pockets over the joints between the slabs for the purpose specified.

In testimony whereof I have aflixed my signature. c

JAMES MGGILLIVRAY.

Copies of this patent may be obtained for\ve cents each, by addressing the Commissioner of Patents. Washington, ID. C.

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