US1915136A - Well point - Google Patents

Description

B; SHARE WELL POINT Filed Nov. 2o, 1951 VMM l y 2,/ lNvl-:NToR' BAFA/ETT SHARE BY x ATTORNEYS 000000000000 00000 l 1 I I I O O OSO OOO O O 0 June 20, 1933.

0 03 OO Oo oC) OO OO OO O atented `Fume 20, 1933 BARNETT SHE, 0F BBONX? NEW YORK wn sorua Application led November 20, 1931. Serial No. 576,227.

ceeding with the excavatin operations.V lt

has heretofore been propose to utilize a well point for the dual functions of jetting the soil by water pressure to prepare a hole of the proper depth for receiving the point, and o f draining the water, by suction, from the soil preparatory to excavating. In order to secure themost ecient drainage and, coincaident therewith, reduce the possibility of an' entering the suction line from the well point during the pumping operation, it'has been proposed to form drainage chambers about the suction pipe of the well point by mounting longitudinally and exteriorly thereof ene or more spacing elements, portions of which extend laterally to the pipe, and winding a water-pervious screen around said pipe and elements. Said screen then combines with lthepipe and the laterally projecting edges of the spacing elements to form. drainage channels extending along the pipe and through whichwater from the soil passes into the jetting head of the well olnt as longas the water level is above said ead. lA device of this nature has a certain degree of eciencyin operation, but it is expensive tov manufacture, owing vto the material used for the spacing elements, and must be frequentlyreplaced because of the wear and tearj upon said elements and the surrounding screen during jetting operations when the well point is being driven into the ground.

In accordance with the present invention, the above objections are obviated to a large extent by `providing an improved and practica-l form of well point in which the use of separate spacing elements is eliminated, thereby materially reducing'the cost of man.- ufacture, and wherein damage to the screen and dislodgement of parts of the well point,-

principally during jetting operations, is minimized.

The inventive idea involved is capable of receiving a variety of mechanical expressions, one of which, for purposes of illustration, isshown in the accompanying drawing,

wherein Figure 1 is an elevation, partly broken 55 away and partly in section, a well point constructed in accordance with the invention;

i Figure 2 is avfragmentary enlarged longitudinal section taken substantially on the line 60 2 2 of Fi re 3, illustrating the position of the control ing valves of the device when the vsame is being employed in ajetting operation; and

r .Figures 3 to 6 inclusive are transverse 95 sections taken substantially on the lines 3-3,

1 -4, 5-5 and 6--6 of Figure 1.

When devicesvof the kind embodied herein areemployed in excavation work for the purpose of draining water from the soil preparatory to the actual excavatin operations, a

series of said devices are sunk 1nto the ground to the desired depth and at suitably spaced lntervals, and are then connected by a header pipe or the like to a common source of power,

such as a pump. The well points are sunk by what is known as a jetting operation, wherein water bunder pressure 1s fed by the pump to the vjetting heads of the points so vas to bore holes in the ground into which the points B0 advance as the operation proceeds.l When the points havecbeep sunk to the proper level, they are connected to a common header pi and the same or a dierent pump may hg utilized to pump by suction, the water in the soil surroun ing each well point and thereby drain the soil.

The well point is illustrated in its preferred form as comprising suction and jetting heads generally indicated by the numerals 10 and 11, respectively, the former consisting of the upper and lower detachable sections 12 and 13 having a valve seat 14 held therebetween, the purpose of which will ap- `the upper end of the conduit formed by said 1 pipe or pipes being connected to the header previously mentioned.

Into the lower end of the section 13 of thesuction head 10 there is inserted and suitably secured, as by Welding or otherwise, the upper end of a ressure and suction pipe 16 which, in accor ance with the present invention, is open-ended and longitudinally luted throughout its entire length to provide a series of substantially uniform convolutions extending about the entire circumference of the pipe.l The inner surface of the section 13 is likewise convoluted so as to form a close lit with the upper end of thepipe`16 in order to prevent water under pressure from passing exterior-ly of said pipe during the jetting operation and also to prevent air from theI drained soil above the water level from being drawn into the head 10 during the pumping operation, thereby minimizing the possibility of breaking the vacuum in the conduit lea ino upwardly to the header. f

Vhen the elements thus Jr'ar described have been assembled, a water-pervious member, generally indicated by the numeral 17, of cylindrical formation is mounted upon the pipe 16 in concentric relation thereto and has' its upper end inserted in the lower section 13 of the head 10, forming a snug lit therewith' so that said member may be easilyl removed and replaced. The member 17 comprises the inner. and outer screens 18 and 19, respectively, the former having a fine vmesh and being made of relatively light material, whereas the outer screen is of comparatively heavy material and of considerably-larger ,mesh/ said outer screen forming a covering for the inner screen and protecting the same against undue pressure and possible-damage which might be occasionedwhen forcing the well point into position during the jetting operation. r1 he screens constituting` the member are also further supported by contact of the outer portions of the series of convolutions of the pipe 16 with the inner wall of the screen 18 at more or less regularly spaced in tervals. By reason of the convolute form of the\ pipe 16, the same combines with the member 17 to constitute a series of 1ongitudinally extending and spaced drainage channels 20 adapted to receive the water which seeps through the screens 18 and 19'during the pum ing operation. i

. A ter the upper end of the'member 17 has been positioned in the Vsection 13, the lower or jett'inghead 11 is mounted' in position. This head comprises two complemental sec'- tions 21 which combine to encircle the lower' end of the pi e 16 and member 17, and .bolts 22 are extended laterally through said 'sections and engaged in opposed grooves 23 formed in the inner surfaces' of said sections l and in two of the convolutions of the pipe 16` at the lower end of the latter, thus "an-, chorng the head 1.1 to said pipe.

Lerares In the upper section 12 of the head 10 there is mounted a spherical valve 24 to which are connected a series of links 25 extendin upwardly through a spider 26 in said hea and into the conduit 15. Before starting a jetting operation, the valve 24 is lifted by the links 25 tothe dotted line position shown in Figure 1 and is secured against the spider 26 by fastening the upper end of the links 15 by any suitable means so as to prevent the pressure of the water,during the jetti-ng operation, from forcing the valve 24 down against its seat 14 and thus allow the water under pressure to have a free passage from the conduit 15 into the pipe 16. ln the lower or jetting head 11 there is also provided a ball-valve 27 disposed Within a chamber 28 and movable between a valve seat 29 and stop pin 30 in said chamber, said valve engaging the pin while the jetting operation is proceeding so as to allow the water fromthe pipe 16 to pass throughv the valve seat 29 and outwardly through the lower open end of the head 11. When pumping, the valve 27 is drawn upwardly by suction t o close the seat 29 and thus prevent the soil or sand from being drawn upwardly into the ipe 16.

In practice, after a hole has been started into which the lower' end of the well point may be inserted, the .valve 24 is lifted a ainst the spider 26 as previously describe and the water pressurethen turned on. The water flowsv downwardly throu hthe pipe 16 and out of the lower endl of t e'head 11, Iforcing the valve 27 downwardly against the stop pin 30, and, by reason of its pressure,l disperses the soil around the lower end of the point to thereb permit the latter to advance into the ole thus made. When the point has been lowered toethe desired level, the-water pressure is shut off and the links 2.5 disconnected so as to permit the valve 24 to drop upon its seat 14 where it' remains until lthe pumping action commences. .During the jetting operation, some of the water passing downwardly through the enters and passes u wardly into t e channels 2 0 and outwardly t rough the screens 18 and 19, thereby clearing the mesh of said screens of any obstructions which may have lodged therein during a previous pumping operation. The pump is now started to create a suction in the conduit 15 and pipe 16 and as the water from the soil 'seeps-thi'ough the screens of the member 17 it ows downwardly in the channels 20 as long as the water level remains above the upper end of the jetting head 11. From the channels 20 the water' passes into the space formed in the head 11 between the lower end of the pipe 16 and the valve 4seat 29, and the latter being now closed by its valve `due to the suction u,

created, said water will then pass u wardly through the pipe 16 and into the ead 10. This upward flow of the water combined with ipe 16 also aeiaiae the suction action maintains the valve 24 in an elevated position so that the Water ma continue to flow from the head 10 u war ly into the conduit'l, but, should ere be a break in the vacuum in the suction line with a consequent momentary stoppage of the upward lowwof water, the valve 24 will drop upon its seat 14 and thus prevent a backward or downward flow of the water in the lo conduit 15 into the pipe 16.

What is claimed is:

relation to said valve seat so as to combine therewith to form a space communicatin with the rst named space and through whic Water flows durin both the suction and jetting operations o the well point.

In testimony whereof, I have alixed my signature.

-BARNET'JLy SHARE.

1. In a well point, spaced heads, a waterbetween said heads, said member being insertable ,into said suction head and embraced by the sections ofsaid jetting head, a pipe connecting said heads within said member and combining therewith to form drainage space communicating with the interior of said pipe through said jetting head, and means extend-A ing through the sections of said jettinghead and portions of said pipe to lock said elements together and clamp the sections of the head in embracing relation about said water- Y pervious member.

3. A well point comprising an imperforate longitudinally fluted pipe, a water-pervious member encircling said pipe, spaced heads into which said. ipe and member extend, one of said heads being formed of separable secand removable means extending throu h said sections and certain of the flutes of sai pipe to securethe last named head to said pipe. i y 4 4. A well point comprising suction and jet'- ting heads, a water-pervious member connecting said heads, al fluted imperforate pipe within' saidmember and havin its ilutes'ex- 5 tendin into said jetting hea to combine therewith and with said water-pervious member to form a series of draina channels which are in permanent 'communication with the interior of said pipe only through said jetting head, and means to connect said pipe andfjetting head together to prevent relative movements therebetween.

v5. A well point comprising suction and jettng h eads, the latter having a valve seat,.a 00 Water-pervious ,member connect' said heads, a ilutell pipe within said mem r and conbining therewith to form drain sai lengt and the lower end thereof projectlcl Y loo y los space, pipe 'being imperforate throng out its

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