US1764845A - Pavement grid structure - Google Patents

Description

L. R. M KENZlE PAVEMENT GRID STRUCTURE June 17, 1930.

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Filed Sept. s, 1928 Z2 H Patented June 17, 1930 units. 'rrs LEON R; rvrAcxnnzin, or one MOINES, Iowa PAVEMENT GRID STRUCTURE Application filed. September 8, 1928. Serial No. 304,788.

or freshly laid plastic material and thereafter the grid structure is subjected to vibrations, impaction or other methods for densifying the concrete or plastic mixture and for removing any air which may be within the plastic material and for bringing the thin mortar up and over the coarse aggregate forming a part of the plastic material. Another object resides in the arrangement of the plurality of elongated cleats uniformly spaced apart and connected together by trans verse tie rods received within the cleat members proper so that the upper and lower surfaces of the completed grid structure are unobstructed thus enabling the grid structure to be used by engagement of either its bottom surface or top surface with the plastic material.

- Still another object is to provide spacer members carriedby the tie rod and received between the adjacent cleat members for holding the cleat members in proper spaced position and at the same time glving rigidity to the entire grid structure.

Still another object is to provide means of connection between each spacer element and itsadjacent cleat member for preventing movement of one of the members relative to the other.

With these and other objects in view my invention consists in the construction, ar-.

rangement and combination of the various parts of my device, whereby the objectscontemplated are attained, as hereinafter more fully set forth, pointed out in my claims, and

the grid structure in spaced apart position showing the relation of onepart relative to the other. 7

F1gure3 1s a sectional view taken on the hue 3-3 of Figure 2 showing a Figure 41 is a sectional view through one of the grid sections resting upon a plastic pavement construction. j

Figure 5-is a perspective view of a slightly modified form of grid structure where the tie rods run lengthwise of the platform.

Figure 6 is a sectional view taken on the line 6-6 of Figure 5.

Figure 7 is a perspective view of one ofthe spacer cleats of the kindused in connection ranged side by side and may be staggered relative to each other so that the entire upper surface ofthe plastic material or pavement structure may be completely overlaid with grid sectionsm Each section is so arranged that when an adjacent section is placed thereagainst, there I is formed and provided an open spaceof substantially the same width as the space between any two cleat elements of a single grid section. Each section includes a plurality of elongated cleats 10.- Each cleat 10 is substan tiallyrectangular in cross section. v j i The cleats are uniformly spaced apart so as to provide spaces 12 between each pair of cleats. The cleats are connected together by a plurality of tie rods 14 provided with heads 16 at one end and screw threads 18 at their other ends. g i

The grid section as shown inFigure 1 of the drawings has the tie rods 14 arrangedsubstantially at right angles to j' the cleats,10.'

, plurality of cleat members connected togethe i with the grid structure shownin Figures 5 Each cleat 10 is provided with a plurality of spaced openings 20 of sufficient diameter to receive the tie rod 14.

In order to properly space the cleats uniformly apart, I provide a number of spacer elements or blocks 22 each provided with a central opening 24 adapted to register with the openings 20 in the cleats 10 and to have the tie rod 14 project therethrough.

It may be here mentioned that the cleats 10 as shown in Figure 1, may be of considerable length and that there is some flexibility of the cleat members themselves.

In order to give rigidity and stability to the entire assembled grid structure, I provide pins or the like 26 upon the sides of the spacer elements or blocks 22 which pins project into openings 28 formed in the cleats 10.

It'inay be here mentioned that when the cleats 10 are formed of wood and the spacer elements 22 formed of metal, that it is possible to have the pins 26 upon the spacer blocks 22 pierce the sides of the cleats 10 and project thereinto without the necessity of actually forming openings in the cleats 10.

The spacer elements 22 serve to maintain the cleats 10 in proper uniform spacing and at the same time prevent any lengthwise movement of one of the cleat elements relative to the others in the same section. It will be further noted that the spacer elements 22 are spaced above the bottom of the cleats and below the top thereof so that after the entire grid structure has been completely assembled so as to form a complete section as shown in Figure 1 of the drawings.

then and thereafter the upper surfaces and the lower surfaces of the cleats may be planed-off or leveled so as to provide as true an upper and lower surface as possible.

' Either surface may rest uponthe plastic concrete material 30 and either surface may receive a vibrating or impacting machine thereupon for giving the plastic concrete material 30 the necessary movement or motion for serving the purpose desired.

The tie rod 14 has a nut 32 mounted on the screw threaded end 18 thereof which nut 32 and washer 34, are of sufiicient width to equal the distance between any two of the cleats 10, the result being that when one 'section A is placed adjacent to another section the nut 32 or head 16 together with the washer 34 tend to space the sections proper distance apart so that the two outside adjacent cleats of adjacent sections, are spaced the same distance apart as any two cleats of the section proper.

In Figures 5, 6 and 7 I have shown a grid structure or section wherein the cleats are 'comparativelyshort while the tie rod memjbers are relatively long. Each of the cleats of Figure 5 are referred to by the reference numeral 35. The tie rods 36 are used for connecting the cleats 35 together.

one surface of the cleats than the other tie red.

It may be said that the tie rods 36 are staggered relative to each other so that there IS a tendency when one tie rod sags to cause the other tie rods to stretch and it is well known that arranging tie rods in a staggered relationship prevents to a great degree free flexing of the members connected together by such tie rods.

In order to take care of the staggered position of the tie rods 36 I provide a spacer block 38 having an opening 40 therein arranged in an off-center position. A pin 42 is formed upon the spacer block 38 and the pin 42 projects into the sides of the cleat elements 35 for uniformly spacing the cleats 35 and at the same time to tie them together,

together with the tie rods 36.

The tie rods 36 pro ect through openings formed in the short cleats 35 and for all practical purposesthe structure shown in Figure 5 is the same as the structure shown in Figure 1. In Figure 8 I have shown cleats 44 arranged at an angle relative to tie rods 46.

In a grid section of the kind shown in Figure 8, it is necessaryto provide spacer blocks or elements 48 arranged at an angle so that when the structure isentirely assembled, the cleats are held at an angle relative to the tie rods and the entire structure is rigid to the extent that the chat members will remain in the same position at all times.

In the practical use of my grid structure -I find tha-t either surface may be used and sections and that either surface serves equally as well for engagement with the plastic material.

The cleat members or spacer blocks may be either formed of wood or metal depending upon the type of structure desired.

While I have referred to the use of my grid section in connection with vibrating machines or impacting machines, I want it understood that the grid section may be used equally as well where heavy rollers are rolled over the grid sections or so-called jigging machines are used; I

My grid sections are adapted to transmit forces from mechanically operated machines to the pavement for ridding the plastic material of excess water, properly distributing the mortar throughout the rock aggregate in the plastic material and eliminating air pockets or voids in the plastic material. 1

Some changes may be made in the construction and arrangement of'the parts of my device Without departing from the real spirit and purpose of my invention, and it is my intention'to cover by my claims, any modified forms of structure or use of mechanical equivalents, which may be reasonably included within their scope.

I claim as my invention:

1. Ajpavement grid structure including a plurality of cleats having flat upper and lower surfaces, spacer elements received be tween the adjacent side walls of said cleats for providing spaces between said cleats, means of connection for said cleats and spacer elements, said means of connection projecting through said cleats and said spacer elements between the u mm and lower surfaces thereof, whereby t e u per and lower surfaces of said cleats are unobstructed, said means of connection causing frictional engagement between the cleats and spacer elements, and additional means for fixedly holding said spacer elements against rota-- tion relative to said cleats- 2. A pavement grid structure including a plurality of uniformly spaced cleats having flat upper and lower surfaces, means of connection for said cleats, said means of connection projecting through said cleats between the upper and lower surfaces thereof and extending transversely of the cleats, whereby the upper and lower surfaces are unobstructed, spacer elements carried by said means of connection and frictionally held relative to saidcleats, said means of connection being successively arranged in different horizontal planes.

3. ,A pavement grid structure including a plurality of uniformly spaced'cleats having fiat upper and lower surfaces, means of connection for said cleats, said means of connection projecting through said cleats between the upper and lower surfaces thereof and extending transversely of the cleats, whereby the upper and lower surfaces are unobstructed, spacer elements carried by said means of connection and fixedly held relative to said cleats, and a pin formed on each of said spacer elements adapted to project into said cleats for holding them against rotation relative to said cleats. V

4. A pavement grid section of materially greater length than width comprising a plurality of cleats havingfiat upper and lower surfaces, devices for uniformly spacing said cleats, and means projecting through said cleats and said spacing devices for connecting them together and for maintaining the grid section in assembled position, and spacing devices having off centered openings for the means to extend through the cleats,

5. A pavement grid section of materially greater length than width comprising a plurality o'f transversely arranged cleats having flat upper and lower surfaces, devices for uniformly spacing said cleats, and means projecting through said cleats and said spacing devices for connecting them together and for maintaining the grid section in assembled position, the cleats and spacing devices having off centered and staggered openings for the means to extend through.

Des Moines, Iowa, September 5, 1928.

LEON R. MACKENZIE.

Hill

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