.3. BEALL, JR. PROCESS OFIMAKING CONC/RETE PLES. APPLICATION FILED APR. 1e, 1904. RENBWBD JUNI: 20, 1908.
RICHARD J. BEALL, in.; or wasnINGTON, DISTRIOT OF OOLUMBIA, Assren'on TO THE QQSIMPLEX coNcRETErILING COMPANY, or WASHINGTON., DISTRICT or COLUMBIA.
A CORPORATION OF THE DISTRICT or COLUMBIA.
PROCESS OF MAKING CONCRETE PILES.
M 'o all whom it may concern it known that l, RICHARD J. BEALL, J rl, al ,citizen otthe United States, residing inrthe city of lVashington, District of CO- 5,y lumbia,'have invented certain improvements in Processes ot Making Concrete Piles, ot
which the following is a speciication.
,Myv. invention relates to that method of formingy piles of concrete'or cement which consists in first driving a preparatorypile intoy the ground, then withdrawing said preparatory pile, and then illing the 'Opening formed thereby with concrete or cement in fluid or plastic form, which when it becomes set forms the permanent p ile.
One object of ,my invention is to provide an eliicient foundation for the concrete pile; and a further object is to provide vfor driving or withdreaving the preparatory pile with the exercise Ot' much less power than is required when piles of this class as heretofore constructed are used.
ln the accompanying drawing: Figure l 1s a sectional view illustrating the method ol i forming the opening in the ground by means of a. preparatory pile in accorda-nce with my invention. Fig. 2 is a. similar View show- 'ing the preparatory pile removed and the opening filled with concrete resting upon a base or foundation introduced into the opening in accordance with my invention.
For the purpose of 'forming in the ground openings Jfor the reception ot concrete or cement to constitute a permanent pile the use of an ordinary wooden or metal preparatory pile ot' cylindrical t'orm or tapering inwardly from top to bottom is objectionable, for the reason that the frictional hold of the earth upon the sides of the same is such that 4U the pile cannot be driven beyond a limited distance without the exercise of destructive torce and cannot be Withdrawn after being driven without the exercise of still greater forcer, frictional hold of the earth upon the pile being now assisted by atmospheric pressure, owing to the 'fact that the withdrawal of the pile tends -to create a partial vacuum in the opening left thereby. F or this reason various fornisfof collapsible piles have been proposed; but.' such piles Owing to their I Specicatcn of Letters Patent.
' :Application med Aprn 1e, 1904, serial No. 203,491. Renewed Jane 2O, 190s. serial No. 439,593.
driven. 1When the pile tapers inwardly from top to bottom, there is the saine resistance to the driving of the pile, and the resistance to the withdrawal of'the pile is also excessive, because owing to the atmos pheric pressure the earth is caused to cling Hrmly to the pile, so as to increase the diliiculty of starting the pile and retard its movement for some time ai'ter it is started. ln carrying out my invention, therefore, I displace the earth at and near the point of the prepara tory pile to a greater extent than the diameter ofy said pile, thereby freeing the pile,veXcept as to-a limited area at and near the point, from any material rictional contact with the walls ot the opening formed thereby, thus facilitating the driving of the pile. The enlarged point of the preparatory pile is detachable therefrom, and f when said preparatory pile is withdrawn said point remains at the bottom oi the hole formed by the pile and serves as a hase or foundation Jfor the permanent pile, which is produced by pouring the cement or concrete into said hole and permitting it to eccome set.
On reiter-ence to Fig. l it will be observed that the preparatory pile l is in the storni et a metal tube, although it may be r pile of wood or metal, it desired, t 1 being provided at the top with a suitable driving-head 2 and at the bottom with a point 3, which is of so much greater dier-neter than the pile l that there7 is no likelihood of the latter coming in contact to ai" material extent with the lwalls of the open.w ing formed by the driving of the pile. The point is reduced in diameter at the top, so as to provide a shoulder for engagement with the lower end oit' the pile, and said point is detachable Yfrom the pile. Hence While it will pile l. so that no abrupt shoulders are pref;
sented to the earth in driving the pilep' fitter the preparatory ilehas been with* drawn, leaving the point the bottom of here, the latter is ,tllled with concreteor cement, which is permitted to remain With-- ree out disturbance until it becomes set, so as to form the permanent pile 6, as shown in Fig. 2. The point 3 can be made of any desired shape and of wood, cast or Wrought iron, steeh'glass, asphaltum, or combinations of the same, or,in fact, of any material which will withstand the Shock of driving,
' preference being given to a point composed of concrete, which may if desired be sheathed with sheet metal except at the top or internally reinforced to strengthen it, as the plas tic concrete of which the pile is composed Will take a better hold upon such concrete point than upon a metal or other point not affording as good a holding surface.
Having thus described my inventiomwhat l claim and desire to secure by Letters-Patent, is: Y
l. The method of making concrete piles, Whi h consists in providing a pile stem with a detachable pointed hole forming end or head of greater' diameter than any part of the pile stem, driving said head to displace the earth and thereby forming a hole larger than the pile stem, detaching and -the hole above said head with concreteor other plastic material adapted to unite With said concrete head, and permitting the same to set.
In testimony whereof I have signed my name to this specilic'ation in the presence of two subscribing witnesses.
RICHARD J. BEALL, JR. lVitnesses:
EMORY H. BOGLEY, H. S. BEALL.V