US1079014A - Method of recording the volume or sectional area or concrete in piles formed in the ground. - Google Patents

Description

J. M. LEIGHTON.

METHOD OF RECORDING THE VOLUME 0R SEGTIONAL AREA OF CONCRETE IN FILES FORMED IN THE GROUND.

APPLIOATION FILED MAR. 5, 1912.

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Patented Nov. 18, 1913.

JOHN MURRAY LEIGHTON, OF BELFAST, IRELAND.

METHOD OF RECORDING THE Specification of Letters Patent.

Application filed March 5, 1912.

VOLUME OR SECTIONAL AREA OF CONCRETE IN PILES FORMED IN THE GROUND.

Patented Nov. 18, 1913.

Serial No. 681,765.

To all whom it may concern:

Be it known that I, JOHN MURRAY LEIGH- TON, a subject of the King of Great Britain and Ireland, residing at Belfast, Ireland, have invented a certain new and useful Method of Recording the Volume or Sectional Area of Concrete in Piles Formed in the Ground, of which the following is a specification.

This invention refers to piles of'the kind in which a tube previously introduced into the ground is filled with concrete and withdrawn, the'concrete flowing out of the lower end andfilling the hole formed by the tube. Such piles may vary in sectional area according to the nature .of the stratum in which they are formed.

WVhen the finished pile is of greater sectional' area than the bore of the tube the level of the concrete within the latter will sink, or decrease in height, in proportion to the expansion of the concrete as it flows out of the tube to fillthe opening in the ground as the tube is withdrawn. The sectional area of the finished pile will bear the same ratio to the bore of the tube as the sinka-ge of the concrete plus the rise of the tube. bears to the rise of the tube for any given length- The object of the invention is the method ofrecording the sectional area of concrete in 'such'piles at all points in their length by means of recording apparatus actuated by the sinking. of the concrete in the tube in relation to the rate of withdrawal of the tube.

In order that my invention may be clearly understood I have appended an explanatory sheet of drawings by way of illustration or example showing one method of carrying my invention into effect or practice whereon:

Figure 1 is a vertical section showing a portion of the head and base of the piledriver. the concrete filled into it. The float 2 rests on the surface of the concrete. The pulling tackle 6 by means of which the tube is withdrawn is shown hooked on to the top of the tube. The recording apparatus 3 is attached to the piledriver near the bottom. Fig. 2 is a front view of the recording apparatus. Fig. 3 is a section of the recording apparatus.

Referring more particularly to the draw- The tube 1 is in the ground with ings: In Fig. 1 the float 2 rests on the surface of the concrete. The line 4 is attached to the float and passes over the guide pulleys 8 at the head of the piledriver and down to the recording apparatus 3 where it is wound upon the drum 9. The line 5 is attached to the tube 1 by means of the hook 41. It passes under the guide pulley 7 and thence to the recording apparatus 3 where it is wound upon the drum 10.

In Fig. 2 the line 4 is attached to and wound on the drum 9 whichis secured to the pinion 11. The pinion 11 engages with the spur wheel 12 to which the pinion 13 is secured and which engages with the spur wheel 14 to which the drum 15 is attached. The gearing causes the surface of the drum 15 to revolve at a rate, say one twentyfourth that of the surface of the drum 9. The-line 16 is attached to and wound on the drum 15 and passing under and over the guide pulleys 17 and 18 is attached to the counterweight 19. The guide 20 carries the marking point 21 and slides along the shaft. 22, the line 16 being attached to it by means of the set screw 23. The line 5 is wound on the drum 10 which actuates the gear wheels 24, 25, 26 and 27 in a similar manner to the gearing 11 to 14 and causes the surface of the drum 28 to revolve at a speed'say one twentyfourth that of the drum 10. In drawing the scale one twentyfourth has been adopted for the diagram to be obtained from the recording apparatus but it will be obvious that any desirable scale may be used. A convenient method of changing the scale would be by varying the diameters of the drums 9 and. 10. The grooved wheel 29is attached to the spur wheel 27. The line 40 is secured to and wound on the wheel 29 and has the counterbalance weight 30 hung to it so as to act against the pull ofthe line 5- and keep the same in tension. The drum 28 may engage with a projection 31 on the grooved wheel 29 so that by removing the pin 32 the drum may he slid along the shaft 33 and revolved free of the gearing to facilitate examination of the diagram or the placing of the paper in position. The shafts 33 and 22 are fixed to the frame 34 and the various drums and gear wheels revolve on the shafts being held in position by the collars 35, 36, and 37. The collars 35 may be pinned to the shafts and the collars 36 may be free to slide and may be held in position by the pin 32. The collars 37 may be made with bracket extensions to hold the guide pulleys 17 and 18.

In Fig. 3 the guide 20 carries the marking point 21 and may be balanced by means of the arm 38 and cam 39 to cause the point 21 to press against the drum 28 with any desired pressure. The cam 39 is placed eccentrically on the arm 38, and as shown on the diagram it is clear of the frame 34. Itevolving the cam half a turn brings it in contact with the frame and moves the arm 88 slightly away from the frame. This causes the guide 20 to turn slightly on the shaft 22 thereby Withdrawing the marking point 21 from the surface of the drum 28 when desired.

The apparatus for making the record may be contained in any suitable case made of wood or wood and glass, but for clearness this has been omitted on the drawings.

The tube having been driven and the concrete placed within it, the float 2 with the line 4; attached is lowered into the tube until it rests on the surface of the concrete. The lines a and 5 may be adjusted at the recording apparatus so as to bring the point 21 into contact with the drum 28 at any convenient point. As the surface of the drum moves at a speed proportional to that at which the tube is withdrawn, and the point 21 travels at a speed proportional to that atwhich the concrete sinks the line traced by the marking point will represent the resultant of the two velocities and may therefore be used to find the ratio of the sectional area of the bore of the tube to that of the finished concrete pile. For instance in the example illustrated a line traced by the marking point on the paper around the drum parallel to the plane of the end of the drum 28 will indicate that the concrete within the tube has remained at the same level for a period during which the tube was being withdrawn and therefore the sectional area of the finished pile would be exactly equal to the bore of the tube for that length. A line inclining to or from the plane of the end of the drum would similarly indicate an increase or decrease in the sectional area of the finished concrete pile as compared with the sectional area of the bore of the tube.

For convenience the paper used for re cording the diagram can be ruled with lines at different inclinations corresponding to different sectional areas of finished piles so that the sectional area of the same can be seen at a glance by noting the coincidence of the resultant with the lines of known value.

Having now fully described my invention, what I claim and desire to secure by Letters Patent is 1. In the formation of concrete piles of the kind in which a tube previously introduced into the ground is filled with concrete and withdrawn leaving the concrete in the ground, the method of indicating the sectional area of the concrete in the ground by utilizing any upward or downward movement of the concrete in the tube, during the withdrawal of the tube, to actuate an indicator whereby an indication is given of any want of uniformity in the change of the relative positions of the top of the concrete and the upwardly moving tube during the withdrawal of the latter.

2. In the formation of concrete biles of the kind in which a tube previously introduced into the ground is filled with concrete and withdrawn leaving the concrete in the ground, the method of recording the sectional area of the concrete in the ground which consists in utilizing any upward or downward movement of the concrete in the tube to move a marker on an indicator card moved at a relatively uniform rate to the rate of withdrawal of the tube so that the marker indicates or records on the card the extent of any upward or downward movement of the concrete at any or all points in the len th of the piles whereby a record is obtained of the sectional area of the piles at any Or all points in their length.

In testimony whereof I afiix my signature in presence of two witnesses.

JOHN MURRAY LEIGIITON. -Witnesses ALEXANDER HAMILTON, ANDREW HAMILTON.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, I). G.

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