US1875668A - Method of casting tetrahedrons - Google Patents

Description

METHOD OF CASTING TETRAI-IEDRONS Filed June 8, 1951 2 sheets-sheet 1 /4a INVENTO'R I 6 Damn. F. SHELDON .l a v I Wrmzss:

Sept. 6,1932. 3, SHELDON 1,875,668

METHOD OF CASTING TETRAHEDRONS Filed June 8. 1931 2 Sheets-Shee 2 INVENTOR E Smamw DAN! Patented Sept. 6, 1932 Dim r. sniiLnon, or Los anennns, CALIroman; l, a a

METHOD OF CASTING TE'I RAHEIPRONS Application filed June 8,

Skeleton tetrahedrons for use for the purpose set forth must be massive and strong and are made of a metallic framework on which concrete is molded to form the corners i6 and beams or legs.

.1 material and labor. Experience shows this work can be performed at a central plant or a station where exact materials for the making of same can be procured and a better grade of concrete be properly cured in the yard; but owing to the great weight and unshippable size of most of these complete figures it is impracticable to make them complete at a central plant.

An object of this invention is to provide a practical skeleton tetrahedron adapted for manufacture in separate parts that may be transported independent of each other to the place of use, and to make provision whereby such parts may be readily assembled and fasmade into integral units.

Another object is to provide a precast tetrahedron formed of permanent materials, which is adapted to quickly become anchored in the stream bed under the erosive and depositing action of the water without disintegration, a device which may become displaced without impairing the stream bank, and to slow down the water sufliciently adj acent to the bank and bottom to insure the collection of silt and detritus against the same and the remainder of the stream being allowedto flow on unimpeded.

Experience in the use has shown in order to prevent the units from being carried away,

the end ones or those that are exposed to heavy current action must be strongly fastened together so as to make a flexible unit of the row of figures that they may readily conform to the irregularitiesof current action.

Another object of the invention is to secure maximum strength in a composite reinforced concrete precast skeleton tetrahedron and particularly to strengthen the corner pieces,

tened together at the place of use, and thereby and 'dispose -theparts to maximum advantages of anchoring efficiency.

Other objects, advantages and features of invention may appear from. the accompanying drawings, the subjoined detailed descripti'on andthe appended claim. l g

I The accompanying drawings illustrate the invention. w 3 5 Figure 1 is aplan view on a small scale of a'stream or river in which is shown a series of skeleton tetrahedrons placed in a desired positionfrom one of ther iver banksand also shows a cable fastening each tetrahedron together to form a flexible row of figures Arrows denote the direction of the river flow.

Fig. 2 is a side view of askeleton' tetrahedron shown embedded iri the river bottom with thewater flowingin the direction ofthe arrow. r V

'Fig.3 is an enlarged fragmenta'l face view of a precast'leg. i I Y Fig.- 4 is a side elevation of Fig. 3.

Fig. 5 is a detail plan viewshowing the connection of three leg sections.- a i Fig. 6 is an enlarged fragmental detail showing one of the bolt connections; I

Fig. 7l'is an enlarged front elevational fragmentaldetail 'view showing another type of loop used to keep the cable in contact'with a leg of the tetrahedron. v Fig. 8 is a plan view of Fig. 7 r Fig. 9 is a plan View of a skeleton'tetrahedron forming a unit constructed in'accoidancewith this invention; it I Fig. 10 is "a side view of the same on a smaller scale. Y Y a Fig. 11 is a .front view. Fig. ,12 is an enlarged side view frame of a leg section; 1 l Fig. 13 is an'end vie'w of.Fig.'1'2. Fig. 14 is a top'view'of one of the leg sections. T 2- 1 a 7 Fig. 15 is an enlargedsection; on 1ineX1 5 Fig. 16 is- 'a side'view of: Fig. 14:." f Fig.1? is a'bo'ttom"=plan view of Fig.116. -(The skeleton tetrahedron iscomposed of six leg sections 1, which are alike, and twelve joints 2, which are alike; {connecting the leg sectionstoeach othen' 7 of the steel The leg sections 1 are provided with reinforcing rods a, b, 0, d and e having straight bodies 3 and rods a, b and 0 have terminal loops or bends 4 that project from the faces 5 of the ends of the leg members. The loops at the ends of the leg sections are alike and are adapted and arranged to be juxtaposed to receive the pins 6 which. are preferably in the form of bolts having a taper end 7 and a slot 8 into which a tapered key 9 is fitted against a washer 10 to hold the pairs of j ux-- ta osed loops together.

'ie wires 11 are preferably positioned along the frame work of the reinforcement rods to hold the latter in proper adjustment.

The terminal loops are economically made by bending the rod terminals to form a U bend, the base of which will protrude beyond the ends of the leg section and are staggered as shown in Fig. 5, to allow the constructor to insert the pins 6 through the loops and make them secure before filling the triangular gap with concrete or other cementitious material to complete the reinforced joint.

The body of the rod beyond the base of the loop is of sufiicient length to be embedded in the body of the leg section as the case may be when the same is molded at the place of manufacture.

Referring to Fig. 1 the method shows a row of tetrahedrons placed in position from one of the river banks, and fastened by a can 12 that may be anchored at 13'to the ban v The cable 12 is shown slidably fixed to the front legs of each tetrahedron by the loops 14 andis fastened to the end unit asat 15. This arrangement or method of' fastening each tetrahedron by a cable to form a flexible row of figures that may readily conform to the irregularities of the current flow of the stream may be carriedout in other'forms of construction and there is no limit as. to the number of units or cables or type of loops that may be vused without departing from the spirit of my invention. 'Iclaimr- '7 Y The method of producing reinforced concrete tetrahedrons adapted for service in establishing and maintaining river banks in and with alluvial soil deposits, wherein the tetrahedron sides are angular and of skeleton formation with the skeleton legs arranged to complete the side configuration, said method consisting in precasting the legs individually with enlarged ends and with reinforcing elements exposed at the ends of the leg, producing the embryo tetrahedron by assembling the respectivelegs into thetetrahedron form w1th the exposed reinforcing elements at an end of a leg positioned relative to those of an adjacent leg to permit the elements to be secured together to anchor the legs relatively with the anchor elements exposed, and then completing the tetrahedron by the addition

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