US1779708A - Method of reconditioning concrete after transportation - Google Patents

Description

E. N. JONES 1,779,708

METHOD OF RECONDITIONING CONCRETE AFTER TRANSPORTATI ON Oct. 28, 1930.

Filed March 27, 1928 3'SheetsSheet l FIB FIB.

INVENTOR Ed Ward N. Jones is 4.110777e Oct. 28, 1930. E. N. JONES 1,779,703

METHOD OF RECONDITIONING CONCRETE AFTER TRANSPORTATION Filed March 27, 1928 3 Sheets-Sheet 2 INVENTOR Edward N. Jones bwmz/ M 7.297%

his affoTwey Oct. 28, 1930. E. N. JONES I 1,779,708

METHOD OF RECONDITIONING CONCRETE AFTER TRANSPORTATION Filed March 2'7, 1928 5 Sheets-Sheet 3 FIB. x1

!NVENTOR Iclw'ard N. Jones 5747M HWW his afforne'q Patented Oct. 28, i 1930 EDW'ARD J'QNES,"OF"PITTSIBURGH', rnnnsrnvnnra nss enon roirnn 0.10 BART;-

LETI & snow COMPAXY, "QECLEVELANI}; on wnico neonmzon ono'HIo METHOD. or: REGONIDITIONING concnnrnnn'rnn Jrnnnsron'rnrron 1 A lication filed March 27, 1192s, ser e no 255,102.

Thisinvention relatesto a method oif're- 'conditioning concrete at the point ofdelivery 7 after transportation and consequent segregation of the sa ine. r Y

During the few years next preceding the date of. filing of an application! for Letters Patent on the inventiouherein describedgin nearly alllarge cities there have been established'fcentral mixing plants in. which concrete ismixed, andfrom which: it is trans'-' ported to the places of itsyuseu As. ordinarily transported and delivered;

the manufacturer of ready mixedjconcr etezis compelled to: restrict his product-ate stiff cmixes th'at is," a mix haying-a water content solow that; it is undesirably harsh. and 'not" sufiicientlycplastic for, satisfactory use; This is particularly detrimental When concrete is desiredof a; consistency permitting to flow around reintorcingsteel; When the Wet concrete is transported anddelivered in fanordi nary manner, the: mixture segregates; lthat is,

the .coarseag'gregate gravitates to the bottom, While the grout; composed, of sand, cement; "T and'water rises above the coarse-aggregate. M When the body of the truck is inclined; to unload the concrete, the grout containing the r most important, ingredient, the cement; runs offflfleaving the coarsecaggregate, stone, slag; or gravel packedli'n the bottom of the truck.-

,{Iliis eii'ectv necessitates the use of pointed tools, and'greateiiort, in orderto dislodge this: packed aggregate. :Italso necessitates a reconditioningof the co crete-b te additional: .mixing. peration,;in orden that the. be in proper condition for pourconcretemay 5 1111 fl d, iof'the "present invention; ie;

. Vents the sticking of tlielcoa'rse aggregate to the ibottonro f the truckpb y dumping the load from collapsible container to the bottom of the trucle tat the ti'me the concrete is to be unloaded. v 71. I v- S egregation occurswhenfconcrete is transportedin any .vehicle,.hut,by performance of t ems h dr e rib dt he n, t is' g i ge is corrected, when thex messiiis; passed from a collapsibleicontainer"tothe bottom of thetlWLGlE-g The grout; which 'hasrisen to'the; top;

during t ansportation oflthe Wet concrete, is

truck bodyis inclinedfordumping and the concrete flows o e an additional remixing and reconditioning step isi'perfo'rmedf V The method of the present invention'in- VolVes the principles of operation" disclosed in my" co-pending application" Serial 'No. 205,588,filed Julyi19,1927. I v.

In thea'ccompanyingdrawings Figure I is cross sectional View through a truck body suitable for conducting the methodofth'epresent invention, showingthe concrete supporting elements of the structure in carry-v ing position; Figure IIis arear elevation of such truck-body; Figure 111, is a diagram-t Ina-tic cross sectional View, showing the posi tion of the container elements during the transportation 7 of f'concrete, endjshowing the condition of the=concrete in the container after transportation; Figure IV is a similar View, illustrating the *condition .ot the con crete during-the initial stages of the collapse ofthe container and deposit of theconcrete onthe true floor 'orfbottom of the truck; Figure V is a similarview, illustratinga further progressive step in the deposit of the concrete. and remixing of, its constituents; Figure V1 is a similar-view, illustrating-the final positionotgthe container elements and the condiitonofthe concrete after it has been ing elements of the structure in carrying pos'ition; FigureIX is a diagrammatic cross, sectional View illustrating a position of-the responding'to the showing ofFig, 1V; Figure X is a similaryiew. showing aposition of the elen'ients and condition'of thematerial corresponding to the showing of Fig V; and Figure Xlis, a similar View showing a position of the u elements andiconditi'on. of the "elements and condition of thematerial 'cormaterial corresponding to the showing of Fig. VI. I I

In the drawings the reference numeral 1 designates the true floor or bottom of the truck body, 2 the transverse members supporting the true floor-or bottom, and 3 upright frame members of the body Container plates 4 and 5 each have a slidingengagementiwith members 6; and each are provided with means, indicated generally by reference numeral 7 for bringing the plates into the position of Figures I and III to form a container for concrete, and for controlling movement of the plates into the position ofFigure VI to depositthe concrete on, thelt-rue flooror bottom 1 of ,the truck body. By reference toFig'ure III of the draw-;

delivery of the concrete consistsinseparat ing, or permitting separation of, the lower portions of the plates 4 and 5. During this separating movement, the concrete is deposited on the floor as the support of the container plates is progressively withdrawn.

In the position shown in Figure IV, the coarse aggregate, which occupied the region adjacent the vertex of the'container, has been already deposited on the bottom 1 of the truck body. This has permitted the material to sink along the longitudinal central line of the body, forming a crater C containing that portion of the grout A which hasnot penetrated the body of the coarser material way of cracks formed therein by this in itial movement. i

As the separating movement continues there is a progressive folding and movement of the material into the crater C, in addition some; masses D 'of the more solid material may detach themselves from the main body and fall into the crater; the crater C is thus filledQand the thinner material or grout,

dispersed through the body of the coarser most wholly supported-by the bottom 1 of the truck body. In this position' substan tially none ofthe grout remains at the surface of the mass, but is distributed throughout the entire body of coarser'material.

It has been found that a better redistribution of the constituents is obtained if the separation of the plates 4 and 5 is gradual 1 may be employed for such purpose.

According to the methodof the invention, the final step of delivering the concrete from the truck bodylisiutilizedtoisecure a final mixing action which insures a uniform distribution' of the grout throughout the vmass of aggregate. In order to effect this final a relatively restricted opening.

As shown particularly in Figure II of the; drawings, a horizontally extending platform 8 is permanently attached at the rear end of the truck and in line with the bottom '1' thereof. In'order'that the rearwardextent of the platformmay be varied at will, an extension 9! is hinged to the permanent platform portion 8.] This hinged portion 9 normally assumes a vertical position,'but may be supported by any suitable means in horizontal alignment with the permanentplatform portion 8.

,On the hinged platform portion 9 are angularly disposed stop bars 10, which converge rearwardly of-this platform portion. Lying I beneaththe rear wall '11 of the truckbody are a pair ofhinged'gates 12, which may be maintained closed position by locking means 13. When lockingmeans 13 are operated to release'gates 12, the"gates may be swung outwardly Tuntilth'eir swinging movement is arrested'by the stop bars 10. In this position they form a chute with converging walls and a restricted opening1'4. j 7 As thebottoinl of the'truck is'tilted by working, theconcrete is delivered through any suitable means,'the material is passed along the bottom 1 and through the aforesaid restricted opening 14 formed. by the convergingwalls constituting the gate members 12.. As the material meets the converging'walls, and is directed to theopening 1'4, the' ma-' terial is causedto turnover ion itself,'and' an additional working thereof is obtained This additional working insures a uniform distribution of the. materials, and avoids a possibility of retaining any of the grout in pockets throughout the mass ofthe material. It will be understood that this additional working'may be obtained by a'nysuitable chute providing a constricted opening, and is'not dependent upon'the particular means shown for forming the same.

Figures VIII to XI inclusive illustrate the use of theparticular forin'of body disclosed in the copending applicationv above noted. In this form of truck body container plates 15 are movably mounted onside frame members 1 6,as by" being hinged at 17 1311 5 Actuating arms 18 are pivot-ally-mounted in for and thereby permitting a gradualspread ly prepared concrete after thereof has settled out which consists in bearings 19 along the sides of the outer struc-" ture ofthe truck and bear against the outer surfaces of the plates. Suitable means,indicated generally by reference numeral 20 are provided to act through arms 18 for bringing the container plates 15 into their carrying position, for supporting them therein, and for controlling movement of the plates during the deposition of the material on the floor or bottom 21 of the truck.

It will be noted that in this modification the container formed by the plates 15 is elevated an appreciable distance above the floor 21. This makes some slight difference in the movement of the material during its cleposition on the floor, but produces approxi mately the same final result.

As shown in Figure IX a crater C is formed during the initial separation of the plates B, and the initial deposition of the material on the floor 21. As shown in Figure X the action results in the enfolding of the grout A by-the coarser aggregate; and the dispersion of the grout through the body of.

the aggregate by way of fissures in the latter, and by the general folding and churning action.

The delivery of the material from the floor 21 of the truck maybe by Way of a chute similar to that illustrated and described in.

connection with Figures I and VII of the drawings, or may be by other suitable form of chute provlding the same constructed discharge opening. I 7

lVhat I claim 1s:

1. The method of reconditioning previousthe aggregate laterally removing the supporting means from a laterally confined mass of the material in a lateral manner so as to produce a constrained progressive spreading in inverse order of the strata of the same on a receiving surface. I

2. The method of delivering previously prepared concrete after the grout thereof has been forced to the upper strata of the mass by a settling of the aggregate which consists in laterally supporting the concrete in a mass having its greater horizontal area in the upper portion thereof. and permitting a spreading of the lower portion of the mass with consequent redistribution of the materials of the mass.

3. The method of delivering previously prepared concrete after the grout thereof has beenforced to the upper strata-of the mass by a settling of the aggregate which consists in laterally supporting the concrete in a mass having its greater horizontal area in the upper portion thereof, and gradually lateral 1y withdrawing the supporting means thereing of the lower portion of the mass with consequent reimpregnation of the aggregate by the previously separated grout.

4. The method of delivering previously prepared concrete after the thin mortar thereof has been forcedto the upper strata ofthe mass by a settling ofthe' coarser aggregate,

which consists in laterally supporting the concrete in a mass of approximately V shape in cross section, and permittingaspreading of the'lower portion of-the mass with consequent reimpregnation ofthe aggregate by the previously separated mortar. I I The method of delivering previouslyprepared concrete in which the grout thereof has been forced to the upper strata of themass by settling of the coarser aggregate which consists in laterally. support-ingthe concrete in a massof approximately V shape cross section, and graduallylaterally withdrawing the supporting means therefor and-thereby permitting a gradual spreading of the segregated aggregate in the lower portion of the mass with consequentreimpregnation of the aggregate by, the previously separated grout.

6. The method ofreconditioning concrete af'er stratification of the aggregate and the laterally supporting such concrete mass and then laterally withdrawing'such supporting means to effect a folding of theaggregate upon the mortar during adepositionof such mass on a receiving surface.

8. The method of reconditioning concrete after the mortar thereofhas been forced to the upper strata of the mass by a settling of the coarser aggregate thereof which consists in laterally supporting the mass of concrete and then laterallywithdrawing such supporting means to effect a folding of the aggregate uponthe mortar during adeposition of such mass on a receiving surface, and discharging the material from saidsiarface by way of a constricted passage. y

In witness whereof, I hereunto set my hand.

EDWARD N; JONES.

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