US2288576A - Sectional pile shell - Google Patents

Description

.Jvne 30,-.19422 u A. c. TlTcoMB ETAL 2,288,576

" sEc'rIoNAL PILE SHELL FMF; Apri 2v, 1940 sheets-sheet 1 L Mark D.Cronc1n WMMQW 'ya June 30,1942. A. C. TITCMB Em 2,288,576

SECTIONAL PILE SHELL d April 2'?J 1940 2 Sheets-Sheet 2 Patented June 30, 1942 UNITED-"` STATES PATENT OFFICE sEcTIoNAL'PILE SHELL-V Albertc. Tatami, ohestnutniil, ana'Mark 1D.y Cronan, BelmontgMass.;assignorsfto New -Enge f land Foundation Company, Inc.;Bostorn'liiass.;-l

a corporation of Massachusetts,V

Application Aprile?, 1940, serial Noi 332,050?` s claims. (01.,61418) filling,v suchas concrete. e

vide a pile'shell formed of sectionswhich can be detachablyassembledupon aV` driving instrumentality-or pre-assembled before the -driving `in f strumentality is inserted into it.

This invention relatesl -to improvements in pile shells formed of superposedsections adapted to be driven into the ground to receive a sui-table' Moreparticularly -theinvent-ion -relatesto a 5 The-invention` further relates to meansffor,l

driving the pilelsection intothe ground."f

One froftheobjects of the invention is to pro-` It is practically impossible to 4drive a-sectional Y is to provide"` means Vforr coupling adjacent sec# tionsitogether which' will permita limited ,rela-Y' tive longitudinal movement between the pilev sec= tions so thateachsectionwill be practically i`n' dependently. driven.. Another object of the invention is to provideV a pile shell'consistingcf a series of superposed sections in which the joint between the several sections'may receive a suitable packing which willy exclude^entrancepf moistureA into 'the in-v terior of the pile shell notwithstanding. the longitudinal slippage of the shell sections.

A further object of the invention is to provide a sectional `pile havingslip joints between the 'several sectionsthereof so constructed that the rst-blow -on the corefor other driving instrumentality, will cause a telescopic movement Ybe tween the sections where necessary without distorting anyshell section sothat the shoulders pile` 'of thin sheetfmetal'by blows applied'to the 20 top of the uppr'mo'stpile lsection, and means have heretoforebeen employed-for driving thejpilesections by providingffconnecting drive rings interposedbetween theseveralsections and' presenting shoulders to beengaged by shoulders of a suitable driving member or core; intending thereby to distribute the force lof the blowfof the hamf mer pile driver to each vsection simultaneously.

The actual Ipracticein `operations of this char i acter is to employa driving member or core so constructedthlt the-"shoulders are a rigid part of thedriving memberfor core and are not ad-` justable -to irregularities in Athe!"construction of the'sectional pile, and it has been foundy diicult, if notirnpossible, so to connect and assemble the sectional `pile "shells that the distance between thedrive rings whch'receive the? blows is precisely the same as the distance between Vthe shoulders of thed-riving member -or core. YAs a consequence. when-the force of the blowof the pile driver is applied -to the "connecting vrings throughtheshoulders of the'fdriving member or core, any difference in 'thedimension between' any two adjacent drive rings andthe dimensions be? tween the corresponding" adjacent shoulders of the `driving member or core will cause the-sectior1`- of shell between the drive rings `to separate from the drive rings or to rupture `at `the Vconnection if rigidly'fastened, thereb'y`a1low'ing `seepage of water and ne soil into the interiorfof the pile 50 shell, or the section of shell will be extendedwor contracted, thereby weakeningthefshell to such an extent that it will sometimes collapse when the drivingmemberor core is withdrawn.

One'` of the 'principal-objects vof the-inventon55 ef thejcore; or driving' instrumentality, andthe shoulders of theconnecting drive rings between theshell sections arean exact' t and thereafter the'pileshellwill move as a Whole with 4thedriving core;

25. Another objectof theinvention is to providey thelupper; end 'of .each pile shell section with a reenforcing collar, preferably having an upwardly andoutwardly inclined ground-engaging face and 30 with'aperipheral 4flangeiorrning a socket to re-` ceve'theflower end of the-adjacent shell section, with suitablemeans forsealing the joint between said sections.

. A further object of the invention is to `provide asectional pile shell in which the thin sheet metal sections thereof* are Aof the' same diameter,l or crosssectional area, and Vin which each section is providediat its'upper end- With a reenforcing drive collarso'constructed as to jbe engaged by a suitable-driving instrumentality, each of the shellsectionsbeing connected by a slip joint of the .character above described.

Another. object of theV invention is to provide a suitable slip joint connection between the suc- 45 Gessive :pile' shellsctions, with suitable packing meanslfor preventing'the:entrance of water, or

other Yuiol,vv in the groundthrough the joint between' the sectionsin'to the interiorfof the pile shell.V

-l-The'seand otherobjects and featuresl of the invention will more fully appear from the following descriptionfandthe accompanying drawings and willbe particularly pointed out in the claims(A il .'Preferred embodiments ofthe invention are illustrated in the accompanying drawings, in which,

Fig. 1 is a vertical longitudinal sectional view of a pile shell embodying the invention and illustrating the driving core simultaneously engaging the drive collars of the several sections and also engaging a suitable drive shoe upon the lower end of the lowermost section;

Fig. 2 is a sectional View on line 2-2 Fig. 1 upon a reduced scale showing the detachable connection between the shell sections and/ or between the lowermost shell section and the drive shoe;

Fig. 3 is a detail vertical sectional view on the irregular line 3-3 Fig. 4, showing the coupled ends of a cylindrical pile shell and also illustrating a driving core having means to engage -'a drive collar on the upper end of the lower section, and the means for detachably causing such engagement, and illustrating in dotted lines the collar-engaging means removed from such engagement when the controlling rod therefor is slightly raised; i

Fig. 4 is a detail vertical sectional view on line 4-4 Fig. 3;

Fig. 5 is a detail vertical sectional view illustrating the construction shown in Fig. 3 and the manner in which vthe controlling rod is connected to the driving head of the core and to the mechanism which engages the drive collar;

Fig. 6 is a detail view of one form of telescopic connection between adjacent ends of successive shell sections;

Fig. 7 is a detail view of a preferred form of bayonet joint illustrated in Fig. 6; and

Fig. 8 is a detail sectional View of another form of coupling showing a bayonet slip joint between adjacent shell sections. v

The sectional pile shell embodying the invention illustrated in Fig. 1 is of the tapered form in which the several superposed sections are of progressively decreased diameter from the uppermost to the lowermost and in which each section desirably is of the same construction as the others except for difference in diameter.

In this construction each pile shell section comprises a tubular portion I of thin sheet metal which as illustrated may be of cylindrical or other form but which may be of any desired contour or may be provided with longitudinal corrugations or horizontal or spiral corrugations as is well known in the art.

The upper end of each pile section is provided with a rigid collar 2, preferably of considerably greater thickness and rigidity thanl the tubular sheet metal portion and which overlies the end of the tubular portion. The collar may be made integral with the shell section but preferably comprises a downwardly extending tubular portion 3 tightly fitting within and secured to the upper end of the sheet metal portion by welding or otherwise. The collar 2, which may be termed a drive ring or preferably a drive collar, desirably, but not necessarily, is provided with an upwardly inclined under surface 4 adapted to force the soil through which the pile shell is driven laterally, thereby to decrease the resistance to the driving of the shell into the ground. The upper surface 5 of the drive collar 4 desirably is parallel to the lower surface 4 and is adapted to be engaged by a complementary inclined surface 6 upon a driving core 'I so that the force of impact of the blow upon the surface 5 will be exerted over a considerable area of said surface at right angles thereto and consequently more effectively drive the drive collar through the ground. The driving core 6 may be solid, but preferably is of tubular form and the several sections thereof are of such diameter that the inclined surfaces 6 will properly engage the drive collars of the several sections simultaneously in the same manner.

Each of the drive collars 4 of the several sections is provided with an upwardly extending peripheral wall 8 of greater diameter than that of the tubular sheet metal portion of the next uppermost pile section. The upper end of each of the peripheral walls 3 desirably is provided with an inwardly extending flange 9 having a suitable inner recess I0 through which an ear or projection upon the lower end of the next uppermost pile section may be inserted and upon relative rotation of the section provide a detachable slip joint coupling which will permit ready assemblage of the several shell sections upon the driving core or preliminarily to the insertion of the driving core therein.

Each of the sheet metal portions is provided at its lower end with an outwardly extending flange which may be integral with the shell section, but which, as illustrated in Fig. 1, preferably is in the form of a sleeve II tightly fitting within the lower end of the shell section and provided with a iiange I2 which extends over the lower 4end of the shell and desirably is provided with a plurality of extensions or lugs I3 adapted to be introduced into the recesses IE) and which upon relative rotation between adjacent shell sections will prevent detachment of the adjacent shell sections. By reason of this construction all the shell sections can be readily assembled upon the driving core or may be assembled to provide a complete pile shell ready to be applied to the driving core.

V`:Suiiicient space is provided between the extensions or lugs I3 and the inwardly extending flange 9 of the collar to permit a limited relative longitudinal movement therebetween which will enable each section to he driven at its upper end without imposing tension upon the next upper adjacent section.

Desirably the upper face of the drive collar is provided with a rib I4 parallel to the peripheral wall 8 and so located that it will not be engaged by the shoulder 6 of the driving core and adapted to form an abutment for a suitable, preferably resilient, packing I5 which is interposed between the ange I2 of the sleeve and the upper face of the collar 2. The collar 2 with its upwardly extending wall 8 forms in effect a socket telescopically to receive the lower end of the next superposed pile shell section so that the packing I5 is present in the socket will exclude the seepage of water, or other iuidy from the earth into the interior of the pile shell.

The pile shell may be provided with any suitable form of drive shoe, either of conical or other tapered form, but preferably is of flat form of the type disclosed in the patent to Albert C, Titcomb No. 1,910,939 granted May 23, 1933.

As illustrated in Fig. l the drive shoe is in the form of a relatively thick flat plate IS, preferably having an upwardly inclined peripheral portion II provided with a vertical wall I8 having an inwardly extending flange I3 provided with recesses 20, similar to the recesses IEI of the inwardly extending flange at the upper end of the collar 2 adapted to receive the extensions or lugs I3 of the sleeve at the lower end of the lowermost pile shell section. The shoe I6 desirably is provided with an upwardly extending rib 2| which with the upwardly extending wall I8 forms a socket to receive a suitablepacking 22 interposed beneath the flange I2 of; the sleeve on the lower end of the shell section and the drive shoe thereby to .exclude seepage of water, or other fluid, into the interior of` the pile.

Various forms of collars for the upper end of the sheet metal shell and sleeves for the lower end of the shell may be employed within the spirit and scope of ,the invention, illustrative forms of which are shown in Figs. 6-7 and Fig. 8. In the construction shown in Figs. 6 7 the drive collar 23, which is adapted to be engaged by the shoulder ,t of the driving core l, `has a vertical tubular portion 24 which fits tightly within and is fixedly secured to the upper end of thesheet metal shell section I and is .provided with a vertical peripheral wall 25 having -a plurality otf preferably equally spaced `bayonet slots which comprise a vertical groove 26 whichleads to a horizontal groove 2l which in turn leads to a vertical groove 28 the upper end 29 of which extends above the horizontal groove 2| a sufcient distance to permit a limited longitudinal sliding movement of the complementary interengaging member upon the sleeve` on the lower end of the next uppermost section.

rhe lower end of the sheet metal sleeve section I has secured to it a sleeve having a tubular portion 39 which nts within and desirably is welded to the shell and is offset outwardly to overlie the end of the shell, and merges into a downwardly and outwardly inclinedportion `3| which in turn merges into a cylindrical portion 32 which fits within the peripheral Wall 25 and is provided with a plurality ofprojections. or lugs 33 adapted to enter and engage the bayonet grooves 2t, 21T,V and 28 of the vertical wall of the col-lar. The lower end portion 34 of the sleeve extends inwardly in parallelism to the upper sur face of the collar and is provided with an upwardly extending flanged end35which slidably fits upon a ring 36 `which is secured to the upper face of the collar;

In order to exclude the entrance of water or other fluid into the shell an annular upwardly inclined spring ring 31 is suitably mounted upon the upper surface of the collar and` a suitable packing 38 is superimposed upon the spring ring- .'l so that when the upper shell sectionis driven down the packing will be resiliently held in engagement with the under face of the horizontal portion 34 of the sleeve inV such manner as to prevent the entrance of water into the pile shell.

Another form of coupling is illustrated in Fig. S in which the drive collar 39, which is adapted to be engaged by the shoulder I` of the driving core is provided with a downwardly extending tubular portion @which tightly ts within the upper end of the sheet metal shell section I and is .secured thereto. The collar 39 is provided with an upwardly extending cylindrical flange 4| and a U-shaped ring 42 which `tightly fits within the vertical wa-ll 4| and is secured toit by suitable welding 43, The lower end ofthe U-shaped ring preferably rests upon the upper surface of the collar 39 andl the inner vertical wall 44 is provided with suitably spaced bayonet grooves 45 of the character above described adapted detachably to receive an inwardly bent projection or knob 45 adjacent the lower endof the shell section InV this particular construction. the lower end of the shel-l is not providedwith a sleeve but the shell section itself is adapted to be detachably interlocked with the U-shaped ring of the collar.

The U-shaped ring 42 may be partially or wholly filled with a mastic, or other suitable packing, to enclose the` lower end of the shell section to exclude the entrance of water through the joint into the pile shell.

Various other forms of preferably detachable connections providing slipV joints between. adjacent sections of the pile shell may be employedv as will readily be understood by those familiar with the art.

Another embodiment of the invention is illustrated in Figs. 3, 4, and 5, includingmechanism for driving sectional pile shells of equal diameter in such a manner that the driving force applied to the pile shell sections will be distributed and applied to the upper end ofeach of the pile. sections. In this construction the upper end of each pile section is provided with a rigid metal drive collar having a tubular portion tting within and secured to the upper end of the sheet metal section and extending thereover preferably in Iangular relation thereto presenting a shoulder adapted to be engaged by driving instrumentalities and having an upwardly extending flange, with means adapted telescopically to fit and preferably detachably to be secured to the'lower end of the next uppermost section, and providing an annular recess above said shoulder to receive a plurality of driving instrumentalities carried by said core. In this construction the driving core is provided with recesses complementary tothe recesses intermediate of the superimposed shell sections and with extensible driving instrumentalities adapted to be inserted through the recesses in said core into engagement with zthe shoulders of said driving collars', or alternatively to be withdrawn within the periphery of. said core to permit withdrawal of the core from the shell when the shell hasbeen sunk to the desired depth.

In the particular construction shown in Figs. 3, 4', and 5, the drive collar 4'! presents upwardly inclined upper and lower surfaces and. has a tubular portion 48 extending into and'fixedly secured to the shell section The drive collar 4'l has a vertical upwardly extending peripheral wall 49 adapted to engage an external sleeve which is xedly secured tothe lower end of the adjacent pile section. In this construction the sleeve comprises a hollow ring of preferably angular contour having a downwardly inclined upper portion 50 which is secured by welding 5l' to the sheet metal shell and a` vertical. section 52 which slidably ts within the vertical Wall V49 of the drive collar and is detachably connected thereto by a bayonet joint (not'shown) of the character illustrated in Figs. 6 and 7ab`ove described. The ring has a lower horizontal portion 53 which preferably extends beneath and is engaged by the lower end of the shell section In this construction a complementary ring is provided which telescopically fits within the lower end'of the sheet metal shell As illustrated this complementary ring comprises an annular portion 54' which seats upon the upper face of the collar and preferably is welded to it, or thevertical wall, and a-n integral horizontal inwardly. extending section ES-having on its inner end a vertical wall 55 which telescopically `engages the the lower horizontalportion 56'* of the collar and a suitable packing 58 is carried by the upper face of the spring ring. When therefore the uppermost shell section is forced downwardly the spring ring 51 and packing 58 will provide a seal which will exclude the entrance of water into the shell. By reason of the construction above described an annular space 59 is provided above the drive collar which is adapted to be engaged by suitable driving instrumentalities mounted upon the core and adapted to be extended through suitable recesses in the core into engagement with the collar and to be removed therefrom to permit removal of the core from the pile shell.

A preferred shell driving construction which is illustrated in Figs. 3 and 5 comprises a tubular steel driving core 66 having a wall of suitable thickness. The driving core is provided at intervals corresponding to the lengths of the respective shell sections with preferably rectangular recesses having parallel preferably slightly upwardly and outwardly inclined upper and lower walls 6I and 62, the upper wall being particularly adapted to be engaged by a shoulder 63 of a driving block 64 preferably of substantially rectangular cross section, both in vertical and horizontal direction, and which is provided with an extension 65 having an upwardly inclined lower surface 66 complementary to the inclined upper surface of the driving collar 41. Each driving block is provided with a relatively narrower integral vertical rib 61 which extends upwardly beyond the core-engaging shoulder 63 and is mounted upon a pivot 68 in bosses 69 extending inwardly from a bracket which is welded or otherwise fixedly secured to the inner face of the driving core 60.

Any suitable number of driving blocks may be employed. As illustrated in Fig. 4 three of such driving blocks are shown and a link 10, which is pivotally mounted on each driving block, is pivoted at its inner end upon a pin 1| which is mounted in bosses 12 extending outwardly from a collar 13 which is flxedly secured to an actuating tube or rod 14 which extends axially of the driving core 60. When the actuating tube or rod 14 is forced downwardly to the position illustrated in Fig. 3 the driving blocks 65 are swung about their pivots 68 so that the ends of the driving blocks extend through the recesses in the walls of the driving core and the inclined lower surfaces thereof engage the shoulder of the driving collar 41. When therefore the driving core is forced downwardly by the blow of the pile driver impinging upon its upper end the force of the blow will be transmitted through the contacting wall 6I of the recess in the core and the shoulder 63 of the block and the under inclined face of the block 66 to the driving collar 41 of each of the shell sections.

When it is desired to remove the driving core from the shell after it has been sunk to the desired depth the actuating instrumentality or rod 14 is raised thereby raising the links 10 to the position illustrated in dotted lines and through said links swinging the blocks simultaneously to the position illustrated in dotted lines in which the outer ends of the blocks are within the periphery of the core so that the core can be moved freely upwardly out of the sunken shell,

Any suitable means may be provided for raising and lowering the actuating member or rod 14. A preferred mechanism for accomplishing this purpose is illustrated graphically in Fig. in which the actuating rod or member 14 is fixedly secured at its upper end to a driving head 15 adapted to rest upon the upper end of the driving core 60 when the actuating member 14 is in lowered position and the driving blocks extended through the recesses in the driving core into engagement with the shoulders of the driving collars. In order to permit relative movement between the driving core 60 and the head 15, the upper portion of the driving core is provided with oppositely disposed recesses or slots 16 and a bar 11 extending through said recesses and said actuating rod is fixedly secured, as by welding, to the actuating rod. These slots 16 are of such length to permit the actuating member or rod to be raised sufficiently to swing the driving blocks 41 within the periphery of the driving core so that the driving core can be removed from the shell.

In the operation of the device the head 15 and the actuating rod or tube which is connected thereto is suspended in such manner that the transverse rod 11 engages the upper ends of the slots 16 in the driving core and thereforesupports the driving core, the head 15 being separated from the upper end of the driving core. When in this position the driving blocks are swung inwardly within the periphery of the driving core. When the head 15 is lowered into engagement with the upper end of the driving core for the purpose of driving the core and shell, the actuating member or rod 14 is moved downwardly relatively to the driving core causing the blocks to be swung outwardly through the slots in the driving core, so that the inclined lower faces of the driving blocks will rest upon the collars at the upper ends of the respective shell sections. When the hammer of the pile driver is repeatedly dropped upon the head 15 force will be transmitted through the driving core 66 to the upper ends of the several shell sections and to the driving shoe at the bottom of the driving core.

When the pile shell has ybeen driven to the desired depth the head 15 may be raised by suitable lifting mechanism thereby raising the actuating member or rod which in turn will raise the links 1l) and swing the driving blocks 65 about their pivots 68, thus withdrawing the ends of the driving blocks within the periphery of the driving core 60. The bar 11 will then engage the upper ends of the slots 16 and further upward movement of the driving head 15 will act through the rod 11 to raise the driving core from the shell.

By reason of the construction above described a cylindrical shell can be driven into the ground readily without buckling any of the relatively thin sheet metal shell sections.

In each of the constructions illustrated a preferred form of driving collar is shown in vwhich the lower face of the collar is of inverted conical form and of greater diameter than that of the shell section next above it and acts to force the soil away from the relatively thin shell section, but the construction may be so modified that the outside diameter of the driving collar is substantially equal to the diameter of the shell as will be readily understood by those skill'ed in the art.

In each of the constructions a slip joint is provided between the adjacent ends of the sections and a suitable packing is provided for such joint to prevent the admission of water or other liquid into the shell.

It will be understood that the preferred embodiments-shown and described herein are of an illustrative character and that various modifications in form, construction and arrangement of parts may be made within the spirit and scope of the following claims.

Having thus described the invention, what is `claimed as new, and desired to be secured by Letters Patent, is:

1. A pile shell, to be ydriven into the ground to receive a suitable filling, comprising a plurality of axially superimposed tubular sections each section having at its upper end a rigid collar therebeneath so constructed as to lock adjacent j sections together. but to permit limited longitudinal movement therebetween.

4. A pile shell, to be driven` into the ground t0 receive a suitable lling, comprising a plurality of. axially superimposed tubular sections each section having secured to its upper end a rigid collar overlyingand engaging said end and preoverlying and engaging said end and presenting ing a socket to receive the lower end of the shell of the adjacent upper section, and complementary coupling means respectively on the lower end portion of each tubular section and the adjacent collar of thenext lower section so constructed as to enable the lower end of the upper section telescopically to enter the socket of said collar and upon limited relative rotation between said adjacent sections to prevent separation of said sections while permitting limited longitudinal movement therebetween, whereby each section will be driven at its upper end without tension upon the adjacent upper section.

2. A pile shell, to be driven into the ground to receive a suitable filling. comprising a plurality of axially superimposed tubular sections each section having at its upper end a rigid collar overlying and engaging said end and presenting a shoulder adapted to be engaged by a shouldered member of a driving core and having a tubular portion tightly fitting within and secured to the section and an outer upwardly extending peripheral wall of substantially greater diameter than that of said tubular section forming a socket to receive the lower end of the shell of the adjacent upper section, and a rigid flange on the lower end of each tubular section adapted to engage the socket within the peripheral wall of the collar at the upper end of the next lower section and means respectively on said flange andthe peripheral wall of said collar for so coupling adjacent sections together as to permit a limited relative longitudinal movement therebetween but to prevent separation thereof.

3. A pile shell, to be driven into the ground to receive a suitable filling, comprising a plurality of axially superimposed tubular sections each section having at its upper end a rigid collar overlying and engaging said end and presenting an upper shoulder adapted to be engaged by a shoul dered member of a driving core and a lower upwardly and outwardly inclined lower soil-engaging surface and having a tubular portion tightly fitting within and xedly secured to the section and an outer upwardly extending peripheral wall of substantially greater diameter than that of said tubular section forming a socket to receive the lower end of the shell of the adjacent upper section, and a rigid sleeve fitting within and lixedly secured to the lower end of each tubular section having a flange portion underlying and engaging the lower end thereof adapted to engage the socket within the peripheral wall of the collar at the upper end of the next lower section, and means for detachably coupling the sleeve at the lower end of each section to the `,senting ashoulder adapted to be engaged by a shouldered member of a driving core and having a tubular portion tightly fitting within and xedly secured to the section and an outer upwardly extending. vperipheral wall of substantially greater .diameter than that of said tubular section forming a socket to receive the lower end of .the shell of ,theadjacent upper section, and a rigid sleeve` fitting within and secured to the lower end of `each tubular section having a flange portion ,underlying and engaging the lower end thereof. adapted to lie within the peripheral wall ofy the collar atthe upper end of the next lower section, means for vdetachably coupling the sleeve atthelower .end of each section to the collar at the upper end of the adjacent section therebe- Vneath in such `manner as to.. permit limited longitudinal movement therebetween, and resilient packing means in said socket interposed between said collar and the flange of said sleeve operable to prevent entrance of fluid through the joint between said adjacent sections 5. A pile shell, to be driven into the ground to receive a suitable filling, comprising a plurality of axially superimposed tubular sections each section having secured to its upper end a rigid collar overlying said end and presenting a shoulder adapted to be engaged by a shouldered member of a driving core and having a tubular portion tightly fitting within and secured to the section and an outer upwardly extending peripheral wall of substantially greater diameter than that of said tubular section forming a socket to receive the lower end of the shell of the adjacent upper section, a rigid sleeve tting within and secured to the lower end of each tubular section having a flange portion overlying the lower end thereof adapted to lie within the peripheral Wall of the collar at the upper end of the next lower tubular section, and a bayonet joint connection between the sleeve of one section and the collar of the adjacent section so constructed as to permit sufficient relative longitudinal movement between said sections to enable each section to be driven at its upper end without exerting tension upon the superimposed sections.

6. A pile shell, to be driven into the ground to receive a suitable filling, comprising a plurality of axially superimposed tubular sections each section having secured to its upper end a rigid collar overlying and engaging said end and presenting a shoulder adapted to be engaged by a shouldered member of a driving core and having a tubular portion tightly fitting within and secured to said section and an outer upwardly extending peripheral wall of substantially greater diameter than that of said tubular section forming a socket having means telescopically to receive and t the lower end of the adjacent upper section and a bayonet and slot connection between said` collar and next adjacent upper section so constructed as to permit limited relative longitudinal movement therebetween but to prevent detachment of adjacent sections from each other.

7. A pile shell, to be driven into the ground to collar at the upper end of the adjacent section receive a suitable filling. comprising a plurality of axially superimposed tubular sections each section having secured to its upper end a rigid collar overlying said end and presenting a shoulder adapted to be engaged by a shouldered member of a driving core and having a tubular portion tightly fitting within and secured to said section and an outer upwardly extending peripheral wall of substantially greater diameter than that of said tubular section forming a socket to receive the lower end of the shell of the ad# jacent upper section, a rigid sleeve tting within and secured to the lower end of said tubular section having a flange portion overlying the lower end thereof adapted telescopically to fit within the peripheral wall of the collar at the upper end of the next lower tubular section, an annular upwardly inclined spring member seated on said collar, and a packing of water-repellent material seated on said ring adapted to be engaged by the flange portion of said sleeve whereby upon driving the pile shell a water-tight joint will be provided between the adjacent sections.

8. A pile shell, to be driven into the ground to receive a suitable lling, comprising a pluralitiT section having secured to its upper end a rigid collar overlying and engaging said end presenting an upper shoulder adapted to be engaged by a shouldered member of a driving core and having a tubular portion tightly fitting within and fixedly secured to the section, and an outwardly upwardly extending peripheral wall of substantially greater diameter than that of said tubular section forming a socket to receive the lower end of the shell of the adjacent upper section, a rigid sleeve tting within and xedly secured to the lower end of said tubular section having a flange portion underlying and engaging the lower end thereof, means for detachably coupling the sleeve at the lower end of each section to the collar at the upper end of the adjacent section so constructed as to lock adjacent sections together but to permit limited longitudinal movement therebetween, and a drive shoe having a vertical peripheral wall surrounding the flange at the lower end of the lowermost section, and means for coupling the drive shoe to the lower end of said lowermost section so constructed as' to lock the drive shoe to said lower section but to permit limited longitudinal movement therebetween.

ALBERT C. TITCOMB. MARK D, CRONAN.

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