US3279196A - Pile construction - Google Patents

Description

Oct. 18, 1966 J. J. DOUGHERTY PILE CONSTRUCTION 2 Sheets-Sheet 1 Filed March 27, 1964 INVENTOR. JOHN J DOUGHERTY BY HTTORNEY Oct. 18, 1966 J. J. DQUGHERTY 3,279,196

FILE CONSTRUCTION Filed March 27, 1964 2 Sheets-Sheet 2 Fig. "fig- INVENTOR. JOH J DOUGHER TY HTTORNEY United States Patent 3,279,196 PILE CONSTRUCTION John J. Dougherty, 262 Rutherford Blvd, Cedar Grove, NJ. Filed Mar. 27, 1964, Ser. No. 355,305 3 Claims. (Cl. 61-5337) This invention relates generally to the art of piling and more particularly to a cast-in-place concrete pile and a method of forming the pile.

These piles are formed by driving a tubular steel core or mandrel into the ground with a driving point on the lower end thereof. After the point has been driven to the depth desired, a tubular steel shell is lowered into the core or mandrel, the steel shell is filled with concrete and the driving core or mandrel is then removed.

The principal object of the present invention is to provide an improved locking joint for automatically locking the pile shell to tamping base or boot on the bottom end of the driving core or mandrel during the lowering of the pile shell into the driving core or mandrel.

Another object of the invent-ion is to provide means for automatically centering the pile shell on the base or boot on the bottom end of the driving core or mandrel.

For a further comprehension of the invention and of the objects and advantages thereof, reference will be had to the description thereof to follow taken in connection with the accompanying drawings wherein FIG. 1 is a vertical sectional view through the center of a driving core, base and shell made in accordance with the invention.

FIG. 2 is a similar view with the driving core removed.

FIG. 3 is a cross-sectional view taken through the line 3-3 of FIG. 1.

FIG. 4 is a view of the bottom end of FIG. 1 showing the relative positions of the pile shell and base or boot preparatory to being locked to each other.

FIG. 5 is a top plan view of the locking plate on an enlarged scale.

FIG. 6 is a part sectional and part elevational view sholwing the locking members of FIG. 4 on an enlarged sca e.

FIG. 7 is a similar view showing the final step.

FIG. 8 is a view similar to FIG. 2 showing the earth base or footing under the driven base or boot.

FIG. 9 is a sectional view of the bottom end of the driving core and tamping base preparatory to driving through the ground.

FIG. 10 is a view similar to FIG. 3 form of shell.

Referring now in detail to the various views of the drawings wherein similar reference characters are used to indicate similar parts, it will be seen from FIG. 1 that an embodiment of the present invention includes a driving core or mandrel 10, a compacting or tamping base or boot 12 on the bottom end thereof and a steel shell 14 supported on the base or boot. The driving core or mandrel 10 is an elongated rigid, drivable, unblocked steel tube or the like which, for example, maybe of uniform diameter, having a wall thickness of about /2 inch and any desired length.

The compacting or tamping base or boot 12 plugs the bottom end of the driving core or mandrel 10 and comprises a dome-shaped body 16 circular in plan and approximately fii inch in thickness and being formed with lower and upper shoulders 18 and 20, respectively. The base or boot is of a diameter sufliciently large to assure that the peripheral edge thereof will extend radially be yond the bottom edge of the pile shell 14.

In accordance with the present invention, a short tubular member 22 is positioned on the top surface of the showing a modified 3,279,196 Patented Oct. 18, 1966 body of the base or boot 12, at its center, and is welded thereto as indicated at 24. The side wall of the tubular member defines an open top and welded across the open top of the tubular member there is a closure plate 26. The plate is formed with a central opening 28 and radial slits 30, extending from and intersecting the opening and terminating in circular notches 32. The slits and opening define flexible segmental arms 34 that are adapted to be flexed and deformed out of the plane of the body of the plate for a purpose to be later described.

The pile shell 14 is of the usual type of casting and armoring corrugated shell which is to serve as a form for the cast-in-place concrete pile. Such shell may be a standard 16 cylindrical steel shell having a helical or spiralled shallow relatively wide groove to form a corrugated tube, as shown in the drawings, and which may be the product identified by the trade name of Helcor shell.

A spider device 38 is carried on the inside of the pile shell 14 adjacent one end thereof, the bottom end as viewed in FIG. 1. The spider device comprises a pipe nipple 40 formed with external threads 42, on the outer surface of the upper half of which radial legs 44 are welded. Feet 46 are formed on the outer ends of the legs and these feet are secured to the inner surface of the pile shell 14 by rivets 48 or may be spot welded.

In operation and use of the embodiment: of the invention shown for setting armoring shells of cast-in-plac e concrete piles, the pile driving apparatus may be set up in the manner proposed in FIG. 9, with the compacting or tamping base 12 resting upon the surface of the soil S as shown in FIG. 9.

Repeated blows by the hammer on the top end of the driving core or mandrel 10 drive the core or mandrel into the ground with the compacting or tamping base or boot 12 leading it, the drive being transmitted from the core to the bottom shoulder 18 of the base. If it is desired to form a bulbous base or footing for the pile, which is advisable in soft or loose soil or water bearing sand, the soil is tamped by the base or boot 12 to form an accumulated bulbous mass 50 as shown in FIG. 8.

When the driving core 10 and base or boot 12 have reached the desired depth, the pile shell 14 is lowered into or telescoped into the driving core 10 in any suitable manner, until the free depending end of the pipe nipple 40 strikes the inner free ends of the flexible arms 34, the nipple being larger in diameter than the diameter of the opening 28, permitting this operation, and continued downward movement of the nipple will spread the arms 34 the threads of the nipple riding over the free end edges of the arms, until the bottom end of the pile shell 14 seats on the upper shoulder 20 of the base 12. During this operation, the free edges of the arms grip and interlock with the threads on the pipe nipple so that the shell 14 is rigidly fastened to the base 12. The dome shape of the body of the base 12 automatically centers the shell and urges it to proper concentric position on the base.

Concrete 54 is then poured into the shell 14 in any suitable manner and the driving core 10 pulled.

The invention contemplates that the pile shell may be formed of material other than steel, such as the paper shell 14 shown in FIG. 10.

While I have illustrated and described the preferred embodiments of my invention it will be understood that I do not limit myself to the precise embodiment shown herein but variations may be made without departing from the principle of the invention and I desire to be limited only by the state of the prior art and the appended claims.

I claim:

1. In pile driving apparatus of the kind described, the combination of a hollow cylindrical driving core, a domeshaped boot plugging the bottom end of the core, a hollow cylindrical pile shell adapted to be telescoped into said core and seated on the boot after the pile driving operation, and cooperating means on the boot and shell for locking the shell to the boot during the telescoping operation, said means including a spider device supported on the inner surface of the shell, said device constituted 'by a pipe nipple with radial legs extending from the upper half thereof, screw threads on the exterior surface of the lower half of the nipple, a slitted locking plate supported on the top of said boot, the threads of said nipple adapted to interlock with the locking plate for fastening the shell to the boot.

2. In pile driving apparatus of the kind described, the combination of a hollow cylindrical driving core, a domeshaped boot plugging the bottom end of the core, a hollow cylindrical pile shell adapted to be telescoped into said core after the pile driving operation, and cooperating means on the boot and shell for locking the shell to the boot during the telescoping operation, said means including a tubular member extending upwardly from the top of the boot, a spider device supported on the inner surface of the shell, said device constituted by a pipe nipple with radial legs extending from the upper half thereof, screw threads on the exterior surface of the lower half of the nipple, a circular plate supported on the top of the tubular member on the boot, said plate having a central opening with spaced slits radiating outwardly from the edge of the opening, said opening disposed in the path of movement of said nipple, the diameter of the nipple being slightly greater than the diameter of the opening whereby upon downward movement of the shell, the nipple strikes the plate and bends the material of the plate between the slits downwardly, the ends of said bent material interlocking with the threads on said nipple thereby locking the shell onto the boot.

3. A concrete pile of the kind described comprising a helically corrugated steel shell, a dome-shaped base plugging the bottom end of the shell, said base having an annular shoulder around the bottom thereof, said shell being seated on said shoulder, means for holding the shell on the boot, said means including a spider device mounted on the inside of the shell adjacent the bottom end thereof, a threaded pipe nipple depending from the center of the spider device, an upright tubular member on the top of the center of the boot, a closure plate across the top of the tubular member, said plate having a central opening and slits extending radially from the edge of the opening, said slits defining segmental arms, the free ends of the arms gripping the threads on the nipple thereby locking the spider device onto the boot, and concrete in the shell on top of and surrounding the boot.

References Cited by the Examiner UNITED STATES PATENTS 951,668 3/1910 Welsh 61-53.7 X 1,480,878 1/1924 Blumenthal 61-55.7 X 2,421,993 6/1947 Cobi 6l53 CHARLES E. OCONNELL, Primary Examiner.

JACOB SHAPIRO, Examiner.

Claims (1)

1. IN PILE DRIVING APPARATUS OF THE KIND DESCRIBED, THE COMBINATION OF A HOLLOW CYLINDRICAL DRIVING CORE, A DOMESHAPED BOOT PLUGGING THE BOTTOM END OF THE CORE, A HOLLOW CYLINDRICAL PILE SHELL ADAPTED TO BE TELESCOPED INTO SAID CORE AND SEATED ON THE BOOT AFTER THE PILE DRIVING OPERATION, AND COOPERATING MEANS ON THE BOOT AND SHELL FOR LOCKING THE SHELL TO THE BOOT DURING THE TELESCOPING OPERATION, SAID MEANS INCLUDING A SPIDER DEVICE SUPPORTED ON THE INNER SURFACE OF THE SHELL, SAID DRIVE CONSTITUTED

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