US3621663A

US3621663A - Ribbed pile

Info

Publication number: US3621663A
Application number: US806918A
Authority: US
Inventors: Akemasa Otani
Original assignee: Individual
Current assignee: Individual
Priority date: 1969-03-13
Filing date: 1969-03-13
Publication date: 1971-11-23
Anticipated expiration: 1988-11-23

Abstract

THIS LOW-COST, LIGHT-WEIGHT, HIGH-STRENGTH, HOLLOW CYLINDRICAL PILE HAVING LONGITUDINAL RIBS IS MANUFACTURED BY ROOLING AN ELONGATED METAL PLATE OF PREDETERMINED WIDTH SO AS TO PRODUCE SPACED RIDGES THEREON EXTENDING AT A PREDETERMINED ANGLE BETWEEN LATERAL EDGES. THE RIDGED METAL PLATE IS SPIRALLY WOUND SO THAT THE RIDGES REGISTER TO PRODUCE LONGITUDINALLY-EXTENDING RIBS AND THE JUXTAPOSED LATERAL EDGES ARE JOINED, PERFERABLY BY WELDING, TO FORM A CONTINUOUS SPIRALED JOINT. WHEN DRIVEN INTO A PENETRABLE MEDIUM, THE RIBS PROVIDE DIRECTIONAL CONTROL AND MEANS FOR JOINING ADJACENT PILES INTO A UNITARY STRUCTURE.

Description

ASA OTANI 3,621,668

Nov. 23, 1971 NOV. 23, 1971 AKEMASA OTAN! 3,621,663

RIBBED PILE Filed March 13. 1969 3 Sheets-Sheet Whg/SW INVENTOR WMM AT TO R NEYA/ NOV. 23, 1971 AKEMASA OTAN| 3,621,663

RIBBED PILE Filed March 13. 1969 3 Sheets-Sheet 5 INVENTOR BY MM ATTORNEYA/ United States Patent O 3,621,663 RIBBED PILE Akemasa Otani, 4, 2-chome Asakusa Hashiba-cho, Daito-ku, Tokyo, Iapan Filed Mar. 13, 1969, Ser. No. 806,918 Int. Cl. E02d 5/28 U.S. Cl. 61-53 4 Claims ABSTRACT OF THE DISCLOSURE This low-cost, light-weight, high-strength, hollow cylindrical pile having longitudinal ribs is manufactured by rolling an elongated metal plate of predetermined width so as to produce spaced ridges thereon extending at a predetermined angle between lateral edges. The ridged metal plate is spirally wound so that the ridges register to produce longitudinally-extending ribs and the juxtaposed lateral edges are joined, preferably by welding, to form a continuous spiraled joint. When driven into a penetrable medium, the ribs provide directional control and means for joining adjacent piles into a unitary structure.

This invention relates to a novel ribbed pile of generally cylindrical configuration, and a novel method of manufacturing the same. More specifically, it relates to a spirally-wound, hollow, ribbed pile and a method of manufacturing the same from at metal plates.

While the following description is specifically directed to steel piles, the invention is not necessarily limited to steel. Other suitable metals which can be mechanically worked economically, such as nickel, aluminum, copper, lead and various alloys, including chromium and nickelcontaining ferrous alloys, and equivalents, may also be used, as those skilled in the metalworking art will recognize in the light of the present disclosure.

Steel tub-ing piles are driven into the earth to form a foundation, and therefore it is required that they be driven straight down. However, conventional spiral steel tubing piles, since they have been manufactured simply by spirally winding flat and plain steel strip and welding the adjacent edges thereof, are prevented frequently from being straight driven due to irregular earth pressure resistances, uneven driving, etc. Another disadvantage of such conventional spiral tubing piles is that they are deformed so as to be uneven in their resistance to pressure. Accordingly, wall thickness must be substantial, thus increasing material costs, manufacturing costs and weight.

To provide a spiral steel tubing pile wherein such disadvantages as above are eliminated, an object of the invention is to construct a strong spiral tubing wherein a plurality of radially projecting ridges or ribs are provided at regularly spaced apart positions about the periphery of steel tubing along the generatrices thereof, and to manufacture a pile therefrom in an easy, inexpensive and exact manner. The ribs are preferably disposed on the exterior surface of the tubing but may, alternatively or in addition, |be disposed on the inner or interior surface.

In the spiral steel tubing pile according to the invention, the plurality of ribs extending along the generatrices serve as guiding means during the driving into the earth, so that the pile is always driven straight down and has no tendency to be deflected. Further, the pile is extremely rigid and strong by Ivirtue of these ribs acting as reinforcing means, so that any torsional moment on such pile may be avoided even when subjected to irregular, uneven external forces. Thus, the pile according to the invention can be made from thinner sheet stock and will still he strong so as to maintain its normal configuration.

Moreover, the ribs are utilized as guiding means when 3,621,663 Patented Nov. 23, 1971 ICC a plurality of piles are driven in juxtaposed relation by engaging a rib of one of said piles with that of an adjacent one, and are also employed as means whereby adjacent piles may be welded together. Further, the pile of this invention can be easily and exactly manufactured by rolling the flat plates with a grooved roll.

The invention will be more clearly understood from the following detailed description of a specic embodiment thereof, said description being read in conjunction with the accompanying drawings, wherein:

FIG. -l is a perspective view of a spiral steel tubing pile of the present invention, sectioned at the center to show additional detail;

FIG. Z is an enlarged sectional 'view on the line IAI in FIG. l;

FIG. 3-1 shows a ridged plate from which the tubing pile is produced by spirally winding the same;

FIG. 3-l`I is an enlarged sectional view on the line '1I-II in FIG. 3-'1;

FIG. 4 is a side elevation showing the tubing pile in a bent condition;

FIG. 5 is a plan View showing a plurality of the steel tubings of the present invention adjacently driven into position to form a pile wall;

FIG. 6 is a side elevational view of a roll apparatus illustrating the manufacture of ridged steel strip for the spiral steel tubing of the present invention; and

FIG. 7 is a sectional view on the line III-III in FIG. 6.

As shown in FIGS. 3-I and 3-Il, a length of steel plate strip 1 of suitable constant width is provided on its outer surface 2 with a plurality of ridges or ribs 4 extending at a suitable inclination angle a to the opposite edges 3, 3 thereof and parallel with each other with regular pitch spacings 5 therebetween. According to said inclination angle, the length of ridged steel plate strip '1' is spirally wound, with the ridges being preferably disposed on the outside tol form a cylindrical tubing. After the formation of cylindrical tubing, adjacent sections of the ridged steel plate strip 1 are welded together in such manner that the ridges on said adjacent sections will be continuous in straight lines, thereby providing a ribbed spiral steel tubing 6.

This spiral tubing is optionally driven into the earth as a foundation pile. Since the spiral tubing foundation pile is so strong and tough, it can be bent into U-shape as shown in FIG. 4 without any crack or fracture at the bent portion. Such bent pile may be advantageously utilized as a sort of sheet pile.

FIG. 5 shows the present piles driven in juxtaposed relation. In this case, the ribs are utilized as guide means as well as welding means.

The elongate ridged steel plate strip can be easily and positively produced in continuous manner by a rolling machine. As shown in FIGS. 6 and 7, a roll 7 is provided with inclined or spiral grooves 8 on its outer peripheral surface, said grooves corresponding in their depth and pitch angle to the height and inclination angle a of ridges 4 which are to be formed on the elongate steel plate strip 1.

The flat steel plate strip is forced into the nip between said roll 7 and opposed roll 10 in the direction shown by arrow 9 in FIG. 7, and is pressed and rolled, whereby the ridged steel plate strip 1 may be readily produced. Rolls 1v1 and '12 are backup or supporting rolls for

rolls

7 and 10, respectively. In this operation, thickness reduction is mad from d in the plate 1 to d in the plate 1. By forming the section of each ridge 4 in trapezoidal shape and making the root portions thereof with curved surfaces 4', stress cracks or the like during the rolling can be eliminated. As described above, the ridged steel plate strip thus produced is then wound spirally and welded at the adjacent edges thereof to thereby obtain a ribbed spiral steel tubing.

-From the above description it is apparent that the objects of the present invention have been achieved. While only one embodiment has been illustrated, many alternative modifications will be apparent from the above description to those skilled in the art. These and other alternatives are considered within the spirit and scope of the present invention, and coverage thereof is intended by this application.

What is claimed is:

1. A metallic cylindrical tubing pile having a plurality of longitudinally-continuous, spaced, upstanding ribs on at least one surface thereof, said ribs extending in straight lines parallel to the axis of the pile, said pile comprising a spirally disposed strip of metal of predetermined constant width and juxtaposed aligned lateral edges, said strip having a plurality of integral ridges of predetermined height, said ridges extending between the lateral edges of the strip and being angularly disposed relative to the lateral 20 edges so as to form with registering ridges said `longitudinally-continuous, spaced, upstanding ribs extending in straight lines parallel to the axis of the pile, the juxtaposed References Cited UNITED STATES PATENTS 2,674,857 4/1954 Fortes 61--45 R X 1,519,694 12/1924 Muessman 138--150 2,151,847 3/1939 Greulich 61-53 3,380,147 4/1968 McDonald 29-477.3 X

FOREIGN PATENTS 241,029 10/ 1925 Great yBritain 52-737 DAVID I. WILLIAMOWSKY, Primary Examiner D. H. CORBIN, Assistant Examiner