US2168459A

US2168459A - Composite pile with h-beam

Info

Publication number: US2168459A
Application number: US143911A
Authority: US
Inventors: Maxwell M Upson
Original assignee: RAYMOND CONCRETE PILE CO
Current assignee: RAYMOND CONCRETE PILE CO
Priority date: 1937-05-21
Filing date: 1937-05-21
Publication date: 1939-08-08
Anticipated expiration: 1956-08-08

Description

Ail s, 1939. M, M, UPSON 2,168,459

I COMPOSiTE PILEv WITH H-BEAH Filed May 21, 1957 2 Sheets-Sheet 1 =EIII|I k K I 1 o D b 4 r r r. P; A 0 v, A I 4 Q 4 In I INVENTOR ATTORNEY I.

2 Sheets-Sheet 2 M. M. UPSON COMPOSITE FILE WITH H-BEAM Filed May 21, 1937 FIGS.

INVENTOR BY W m! ATTORNEYS Patented Aug. 8, 1939 UNITED STATES PATENT 'OFFlCE 2,168,459 COMPOSITE PILE WITH H-BEAM Application May 21, 1937, Serial No. 143,911

2 Claims.

This invention pertains to composite piles, and an object of the invention is to disclose a practical composite pile having an H-beam (or other structural shape) lower section and a concrete upper section.

An advantage of an H-beam pile is the fact that, due to its comparatively slight displacement it has little surface friction and may therefore, under some conditions, be driven to rock through hardpan, gravel and sand. But that same characteristic of the H-beam is a disadvantage because, after driving, practically all the load comes on the point, for the reason that the surface friction is not a material load-carrying factor.

Another disadvantage of the H-beam pile is the probability of corrosion above the permanent water line.

An object of the present invention is to make use of good features of the H-beam and to largely avoid its disadvantagesby forming a composite pile with an H-beam lower section and a concrete upper section. The concrete upper section makes the upper part of the structure permanent by avoiding corrosion. The concrete, because of its large displacement and surface area, has a very material carrying capacity, thus relieving the point of the H-beam of enough of its load to justify the use of the H-beam point under certain engineering and economic conditions.

Another object of the invention is to provide means for transferring the load from the concrete upper section to the steel lower section.

Further and other objects and advantages will be apparent from the specification and claims, and from the accompanying drawings which i1- lustrate what is now considered a preferred embodiment of the invention.

Fig. 1 shows a finished pile after driving.

Fig. 2 is an enlarged detail during driving.

Fig. 3 isan enlarged detail of a finished pile.

Fig. 4 is a cross-section on line 4-4 of Fig. 3.

Figs. 5 and 6 show modified details.

Fig. 1 illustrates a finished pile after driving. H2 is the H-beam resting on rock 12, while l3, l4 and I5 is the concrete upper section projecting above ground level 16. The concrete section as illustrated is of the stepped tapered construction disclosed in my Patent No. 1,836,140, December 15, 1931.

If driver headroom permits, the pile could be driven in one operation, but if headroom is lacking the steel section may be driven first, and then followed down with the concrete section, in well-known manner. Fig. 2 shows the lower end of the drive core, the upper end of the H- beam, the plow ring and lower shell section ready for driving. 18 is the drive core, having a recess in its lower end to accommodate and guide the upper end of beam 10. The shell section 20 is carried down by the usual plow ring 22 attached to a plate 24 provided with an H- slot to fit around the beam for excluding dirt and water (Figs. 2 and 3). In order to enter the shell over the beam the shell and plate 24 can be rotated to proper position before lowering the drive core into the shell.

After removal of the drive core and before pouring the concrete, a cage of reinforcement, which may be in the form of spiral wire 25 and straight bars 26 may be placed inside the shell around the upper end of the beam.

If it be desired to shorten the embedded portion of the upper end of the H-beam, various devices may be used for providing sufficient bonding surface in that shortened portion. For instance, vertical plates may be welded to the web of the beam, as indicated by dotted lines 28 (Fig. 5). Another device which permits shortening of the embedded portion is to weld a horizontal shelf-like plate 39 (Fig. 5) to web and flanges on each side of the beam at the bottom of the concrete. A welded angle brace 32 may be placed under each shelf 36, if desired.

Fig. 6 shows a modification in which the beam does not project into the concrete at all. A plate 34 is welded horizontally on the top of the beam, or is held there by bolted brackets such as 36. As illustrated, a corrugated screw threaded collar 38 is welded to the rim of plate 34. The lowest shell section 21! is screwed into collar 38. After driving, the pile is filled with concrete 42 to form the finished structure.

It is to be understood that the invention is not limited to the specific embodiment herein illustrated and described, but may be used in other ways Without departure from its spirit as defined by the following claims.

I claim- 1. A composite pile comprising in combination an H-beam lower section having a horizontal plate on its upper end and a concrete upper section attached to the 'H-beam through the instrumentality of said plate.

2. The invention set forthin claim 1 in which said attaching means comprises a corrugated screw-threaded collar welded to said plate and threaded to the bottom of the lowermost shell of the concrete upper section.

MAXWELL M. UPSON.