US1822602A

US1822602A - Revetment mat

Info

Publication number: US1822602A
Application number: US473727A
Authority: US
Inventors: Blair A Ross
Original assignee: Individual
Current assignee: Individual
Priority date: 1930-08-07
Filing date: 1930-08-07
Publication date: 1931-09-08
Anticipated expiration: 1948-09-08

Description

p 1931. B. A. ROSS 1,822,602

REVETMENT MAT Filed Aug. 7, 1930 2 Sheets-Sheet 1 Sept. 8, 1931. B. A. ROSS 1,822,602

REVETMENT MAT Filed Aug. 7, 1930 2 Sheets-Sheep 2 Patented Sept. 8 1931 UNITED STATES BLAIR A. ROSS, OF MEMPHIS; TENNESSEE REVETMENT MAT Application filed August 7, 1930. Serial No. 473,727.

This invention relates to improvements in revetment mats which are to be used for the purpose of preventing erosion of the banks or channels of streams especially those a which flow through alluvial or other readily erodable land, or for preventing other erosion due to the flow or wash of water. Streams flowing through alluvial lands are constantly shifting and if they are to be sta- I.) bilized, it becomes necessary to revet portions of the bank often for considerable distances along the stream, such revetment often extending to quite deep water and also Well up along the bank. Likewise the wash of waves or flow of water over dams or other obstructions cause serious damage, which strands composingthem having been subject to early destruction by rusting, especially in streams where fluctuation causes alternate submerging and exposure to the air. In such cases it is often found after very short periods, that rupture has taken place, allwing the mat to separate into sections and dc struction of the bank to occur.

This invention specifically relates to improvements in the means by which the concrete mats are secured together, and also to improvements in means by which such mats may be attached to placing means, such as those shown in my pending application for patent Serial No. 473,728 filedflAugust 7, 1930, which application is directedto means and methods for placing these and other forms of mats. 7

The objects of the present invention are:

To provide a mat made up of a plurality of similar units;

To provide simple and efiicient means for securing these units together;

To provide means associated with the connecting means by which the mat may be readily engaged, and supported for placing; and

To provide connecting means by which the strains of the connectors may be most efficiently transmitted to the slabs.

The means by which the foregoing and other objects are accomplished and the man ner of their accomplishment will readily be understood from thefollowing specification on reference to the accompanying drawings, in which F ig. 1 is a fragmentary sectional elevation taken as on the line II of Fig. 2, showing adjacent slab corners together with the connecting means and support loop.

Fig. 2 is a fragmentary plan with the support loop cut away as on the line IIII of Fig. 1, showing an adjacent corner of each of four slabs.

Fig. 3 is a fragmentary sectional elevation taken as on the line III-III of Figs. 1 and 2.

Fig. 4 is a fragmentary plan View of a portion of a mat showing a number of slabs connected together.

Fig. 5 is a fragmentary plan of a corner of one of the slabs; and

Fig. 6 is a corresponding elevation thereof.

Referring now to the drawings, 10 are concrete slabs of identical shape and size a number of which'are connected together to form a revetment mat of which a portion is shown in Fig. 4.

Each of these units comprises a thin fiat slab of concrete ordinarily three or four inches thick, preferably either square or rectangular in plan and ordinarily made about eight feet square or if rectangular about eight feet wide, and twelve feet. long. These dimen- 95 sions however are for the purpose of illustration only and of course may be varied to suit conditions, handling facilities, or 1 for other reasons.

Preferably, these slabs are reinforced in usual or desired manner but such reinforcement not being a portion of the present invention, is purposely omitted. Obviously triangular or hexagonal slabs maybe used instead of square slabs if it be so desired.

The corners of each slab are cut away to form chamfered corners 11, which provide space when the slabs are assembled, in which the attaching means may be disposed.

Projecting horizontally from each such chamtfered corner, substantially midway of the depth or thickness of the slab, is a rod 12 the end of which 13A, is bent vertically upward. The rods 12 may be extended diagonally across each slab so that the two ends of one such rod would form the two diagonally opposite hooks. Since the assembled mats are subject to strain down stream and also out from the bank, such diagonal placing accomplishes the most efficient type for the resultant stresses.

In Fig. 3, the rod ends 13A are shown dotted. In such position a ring 14 is placed over them and they are bent over the ring as shown to form hooks 13, which hooks securely engage the ring by which they are held together.

After the rod ends have been bent over the ring to hook form, a washer 15 is laid on the top of the hooks and the shank 16 of the loop 17 is passed through the washer and between the hooks. An additional Washer 18 is placed against the underside of the hooks and the nut 19 screwed on the threaded end of the shank to secure the loop in place. This assembly also serves to clamp the bight of the hooks and materially assists in preventing their opening out under strain.

111 laying a mat the individual slabs are assembled with one corner of each of four slabs together. A ring is then dropped over the tour up turned rod ends and they are bent over as before described, the washers and loops are placed and tightened, and the particular connection is completed. Similar connections are made at all corners to complete the mat.

Obviously the rods 12, where they extend well into or across the slab form part of the reinforcement for the slab, and conversely, portions oi the reinforcement may be er:- tended and such reinforcement flexibly connected together to join the slabs.

Having described my invention, what I claim is:

1. In a revetment mat comprising concrete slabs assembled with one corner of each of four slabs adjacent, hooks each projecting from a block corner, a ring engaged by and holding together the tour adjacent books, a lifting loop having a shank disposed through said ring and hook assembly, and means for securing said loop to said assembly, said attaching means engaging said hooks to prevent opening thereof.

2. In a revetment mat comprising concrete slabs having cham'fered corners assembled with one corner of each of four-slabs adjacent, hooks each projecting from a block cornor, a ring engaged by and holding together the tour adjacent hooks, a lifting loop having a shank disposed through said ring and hook assembly, and means for securing said loop to said assembly, said attaching means clamping said hooks to retard openii'ig thereof.

3. In a revetment mat comprising concrete slabs assembled with one corner of each of a plurality of slabs adjacent, hooks each projecting from a block corner, a ring engaged by and holding together the said hooks, a lifting loop having a shank disposed through said ring and hook assembly, and means for securing said loop to said assembly, said at taching means clamping said hooks to retard opening thereof.

4. A revetment mat unit, comprising a rectangular concrete slab, having its four corners beveled, rods each projecting horizontally from a slab corner, and thence bent upward at right angles to form hook mem bers, said hook members lying wholly within the rectangle circumscribing said slab.

5. A revetment mat unit, comprising a rectangular concrete slab, having its four corners beveled, rods each projecting horizontally from a slab corner, and thence bent upward at right angles to form hook members.

6. A revetment mat unit, comprising an equiangular polygonal concrete slab, having its corners beveled, rods, each projecting horizontally from a slab corner, and thence bent upward at right angles to form hook 1nembers, said hook members lying wholly within the polygon eircumscribing said slab.

7. A revetment mat, comprising a plurality of similar rectangular concrete slabs assembled in longitudinal and transverse rows, said slabs eachhaving its corners cut away to provide a space for connecting means, and connecting means for adjacent slab corners, each comprising a ring, and rods, each projecting horizontally from a slab at said corners, said rods being bent upward to receive said ring and backward over said ring toward said slab to hold said. ring in place.

8. A revetment mat, comprising a plurality of similar polygonal concrete slabs assembled in rows, said slabs each having its corners cut away to provide a space for connecting means, and connecting means for adjacent slab corners, each comprising a ring, and rods each projecting horizontally from a slab at said corners, said rods being bent upward to receive said ring and backward over said ring toward said slab to hold said ring in place.

9. A revetment mat, comprising a plurality of similar straight sided concrete slabs assembled in longitudinal. and transverse rows, said slabs each having its corners cut away to provide a space for connecting means, and connecting means for adjacent slab corners, each comprising a ring, and rods, each projecting horizontall from a slab at said corners, said rods, being bent upward to receive said ring and backward over said ring toward said slab to hold said ring in place.

10. A revetment mat unit adapted for connection to similar units, comprising a rectangular concrete slab having the four corners thereof chamfered, rods each projecting horizontally from a slab corner and bent upward at right angles to form a hook member, said hook members being adapted to be connected to hook members of other slabs by placing a ring over said hooks and bending them to secure said ring.

11. A revetment mat unit, adapted for connection to similar units, comprising a polygonal concrete slab, having the corners thereof chamfered, rods each projecting horizontally from a slab corner and bent upward at right angles to form a hook member, said hook members being adapted to be connected to hook members of other slabs by placing a ring over said hooks and bending them to secure said ring.

12. A revetment mat unit, adapted for connection to similar units, comprising a straight sided concrete slab, having the corners thereof chamfered, rods each projecting horizontally from a slab corner and bent upward at right angles to form a hook member, said hook members being adapted to be connected to hook members of other slabs by placing a ring over said hooks and bending them to secure said ring.

13. A revetment mat, comprising a plurality of rectangular concrete slab units, each having chamfered corners, assembled with one corner of each of four units adjacent; said units having hook members each projecting from an edge thereof in said chamfered corners, and rings, each connecting the adj acent hooks of four units, said rings each being assembled over four hooks and the latter thereafter bent to permanently secure said ring.

14. A revetment mat, comprising a plurality of concrete slab units, each having chamfered corners, assembled with a similar plu rality of corners of units adjacent; said units having hook members each projecting from an edge thereof in said chamfered corners, and rings, each connecting the group of hooks of adjacent corners, said rings each being assembled over said hooks and the latter thereafter bent to permanently secure said ring.

In testimony whereof I hereunto afiix my signature.

BLAIR A. ROSS.