US3333430A

US3333430A - Boot for pipe pile

Info

Publication number: US3333430A
Application number: US451209A
Authority: US
Inventors: John J Dougherty
Original assignee: Individual
Current assignee: Individual
Priority date: 1965-04-27
Filing date: 1965-04-27
Publication date: 1967-08-01
Anticipated expiration: 1984-08-01

Description

8" 1967 J. J. DOUGHERTY 3,333,430

BOOT FOR PIPE FILE Filed April 27, 1965 INVENTOR. JOHN J Dou GHER TY HTTORNEY United States Patent 3,333,430 BOOT FOR PIPE FILE John J. Dougherty, Cedar Grove, NJ. (262 Rutherford Blvd, Clifton, NJ. 07014 Filed Apr. 27, 1965, Ser. No. 451,209 1 Claim. (Cl. 61-53) ABSTRACT OF THE DISCLOSURE A boot for a pipe pile having a steel dish-shaped body with a fiat bottom and an annular upstanding side wall, a skirt portion depending downwardly from the body and formed with a circular knife edge, reinforcing radial ribs extending from the body and the skirt portion to the center where they meet, the meeting edges being pointed, the ribs having knife edges along their outer long edges.

This invention relates to piling and more particularly to an improved boot for a pipe pile.

Files are used to support or to form foundations for structures, such as buildings, tanks, bridges, conduits, piers, wharves and the like by driving them into or through the yielding surface strata far enough to obtain a solid support for the principal structure. In driving pipe piles for foundations, the ordinary practice is to depend upon friction between the exterior surface of the pile and the soil through which the pile passes to develop its bearing power or supporting power. The stresses in the earth during such operations are concentrated around the pile.

A principal object of the present invention is to produce a pipe pile which will assure firm lateral earth support for the pipe, in which the accumulation of a core of earth in the pipe is prevented and therefore the removal of earth is obviated, and in which the driving edge of the pipe pile is protected against damage.

Another object of the invention is to provide a boot for a shell or pipe pile that will break up, crush or force aside boulders or other obstructions encountered during the driving operation, causing the displaced earth to consolidate around the pipe pile, thereby strengthening the earth wall and affording a lateral stability to the pile in its function as a supporting column.

Another object of the invention is to provide a boot for a pipe pile that increases the tip area of the pile.

A further object is to provide a boot for a pipe pile that has the effect of a punch and drill when the pile is being driven thereby driving the pile straight down thus preventing doglegging or oifcenter driving and being very effective in breaking hard rock.

Yet another object of the invention is to provide a boot for the end of a pipe pile for augmenting the supporting power of the pile so that it will function as a combined friction and end bearing foundation pile.

Still another object is to provide an improved boot of this type that is especially well adapted to withstand both tensional and compressional longitudinal forces as well as lateral stresses.

For further comprehension of the invention and of the objects and advantages thereof reference will be had to the following description and accompanying drawings and to the appended claim wherein the novel features are more particularly set forth.

In the accompanying drawings forming a material part of this disclosure:

FIG. 1 is a vertical sectional View of a boot for a pipe pile through the center thereof shown applied to the bottom of a pipe pile, taken on line 1--1 of FIG. 2.

FIG. 2 is a bottom plan view thereof.

3,333,430- Patented Aug. 1, 1967 FIG. 3 is a crosssectional view taken on the line 3--3 of FIG. 2.

FIG. 4 is a sectional view taken on the line 4-4 of FIG. 2.

FIG. 5 is a view similar to FIG. 2 of a boot embodying a modified form of the invention.

Referring now in detail to the various views of the drawing, a boot for a pipe pile 10 made in accordance with one form of the invention is shown in FIG. 1 and is designated generally by the reference numeral 12. The boot 12 made of cast steel alloy and is a unitary structure comprising a circular shallow dish-shaped body with a flat bottom 14 and an annular side wall 16 extending upwardly. The under surface of the bottom 14 tapers downwardly and outwardly as indicated at 18 from a point closely spaced inwardly from the periphery thereof to said periphery forming an enlargement 20. A skirt portion 22 depends downwardly from the enlargement. The inner surface of the skirt portion tapers downwardly and outwardly slightly, and the end edge of the skirt portion tapers slightly downwardly and outwardly from the inner surface of the outer surface of the skirt portion, forming a knife edge 24. The enlarged portion 20 of the body is formed with an outer flat annular shoulder 26 having a beveled corner 28.

The body of the boot 12 is inserted into the open end of the pipe pile It), with its shoulder 26 contacting the fiat bottom end edge of the pile, and is fastened to the bottom end edge of the pile by welding as indicated at 30.

In accordance with the present invention four radial walls or ribs 32 reinforce and strengthen the body, extending from the tapered enlarged portion 20 and from the skirt portion 22 at the periphery of the body to the center of the body, said walls or ribs being spaced degrees apart so that they are in end-to-end relation at the center as best seen in FIG. 2. The opposed side surface of the walls or ribs taper slightly outwardly toward the outer edges thereof as indicated at 34. At the center, the Walls or ribs form a curved hub portion 36 which reinforce the center of the body. The outer edges of the walls or ribs taper downwardly and outwardly from the plane of the edge of the skirt portion 22 to the center of the body. The outer end edges of the walls or ribs are tapered to a knife edge 38, and the inner ends of said outer end edges are pointed and contact each other forming mitre joints it].

In operation, when the pile with the boot thereon is driven, the knife edges 38 on the outer ends of the ribs 32 initially penetrate the ground followed by the ribs and then the skirt 22. The ribs serve as a drill penetrating heavy layers of dense material such as coarse sand, hardpan or decomposed rock. Boulders depending upon their size and the material upon which they rest are usually crushed or broken or pushed aside by the boot, and hard rock is penetrated.

In FIG. 5, a modified form of boot 12' is shown. The boot 12 differs from the boot 12 in that five walls or ribs 32 are shown spaced equidistantly around the body of the boot. In all other respects, the boot 12' is similar to boot 12 and similar reference numerals are used to indicate similar parts.

While I have illustrated and described the preferred embodiments of my invention, it is to be understood that changes in details of construction might be made without departing from the principle of the invention and I desire therefore to be limited only by the state of the prior art and the appended claim.

I claim:

A boot for a pipe pile comprising a dish-shaped body of cast steel alloy with a flat bottom and an annular side wall extending upwardly, the under surface of the bot tom tapering downwardly and outwardly forming an enlargement, a skirt portion depending downwardly from the enlargement, said skirt portion terminating in a circular knife edge, a plurality of radial ribs reinforcing the body and extending from the tapered enlarged portion and from the skirt portion at the periphery of the body to the center of the body, the outer edges of the ribs tapering to a knife edge, the inner adjacent ends of the outer end edges of the ribs being pointed and contacting each other forming mitre joints, said end edges disposed generally in the plane of the bottom edge of the UNITED STATES PATENTS 1,884,686 10/1932 Hilpert 6l-60 2,562,860 7/1951 Cobi 6153 2,874,547 2/1959 Fiori et a1. 61-53 DAVID J. WILLIAMOWSKY, Primary Examiner.

JACOB SHAPIRO, Assistant Examiner.