US1505174A - Concrete-pavement construction - Google Patents

Description

Aug. 19, 1924, 1,505,174

E. K. TRIOL CONCRETE PAVEMENT CONSTRUCTION Filed Feb. 9, 1922 W Z f7 M 5E M Patented Aug. 19, 1924.

UNITED STATES EDWARD K. TRIOL, OF SEATTLE, WASHINGTON.

Y CONCRETE-PAVEMENT CONSTRUCTION.

Application led February 9, 1922. Serial No. 535,258.

To all whom z't may cof/wem: f

Be it known that I, EDWARD K. TnIoL, a citizen of the United States, and resident of Seattle, in the county of King and State of Vashington, have invented certain new and useful Improvements in Concrete Pavement Construction, of which the following is a specification, 4reference being had therein to the accompanying drawing.

This invention relates to concrete pavements and to forming the same', the ends sought being: a satisfactory pavement that can be produced rapidly and at ,low cost by ordinary workmen; that allows expansion; that is readily made of any desired width without losing its advantagesg' that may rise and fall unequally, to a moderate extent, without cracking; that consists of constituent blocks or areas arranged to transmit load strains from one to another without olf-setting at the lines of division; that contains simple and eiective metal reinforcement tying its segments or blocks together; that has its consecutive constituent segments so connected that one cannot either rise or fall without the other, and yet may have a plurality of segments removed and replaced together or simultaneously.

lln the accompanying drawings, which are largely diagrammatic,

Figure 1 is a plan view of a portion of the pavement in place.

Fig. 2 is a perspective view on a larger scale, showing portions of two connected consecutive blocks or segments.

Fig. 3 is a section on the line 3 3, Fig.

2, reinforcement being shown. p

Fig. 11 is a similar section through a joint arranged for expansion.

Fig. 5 is a perspective view of a portion of ametal jo1nt-forming member.

Figs. 6, 7 and 8 are plan views of slightly dierent forms of the member of Fig. 5.

Fig. 9 is an end view ot the structure of Fig. 5.

Fig. 10 is a view like Fig. 3 showing the blocks or segments thickened near the joints.

1n these gures, 11, 12, 13, 14 represent marginally interlocking concrete slabs, 11 and 12, extending across the way to be aved or surfaced with concrete, and 13, 14 blocks or slabs narrower than the wa to carry, respectively, trallic in op osite 'rections, both forms being used, when desired, in the same traiiic avenue, conditions varying in different sections. The contiguous margins of successive slabs are interlocked by projections from the lower part of each fitting in corresponding recesses in the margin of the other and barring independent movement of' either except longitudinally of the roadway and in the common plane of the slabs. Each slab has, preferably, a shoulder 15 extending downwardly for a short distance from its upper surface, and below this shoulder a series of salient portions 16 alternating with recesses 17, formed by undercutting. The salient portions or projections 16, fit in recesses, like the recesses 17, in the companion slab, and in the recessses 17, fit corresponding projections on the other slab. Preferablyall the projections slope downward and are transverse with respect lto the general vertical plane of the shoulder 15. Two slabs formed in this manner can` be moved perpendicularly to the joint into close engagement, as in Fig. 2, but they cannot move otherwise relatively, to any eat extent without breaking the projections 16. When it is desired to increase the strength of these projections without great increase in cost, the slabs are thickened downwardly near the joint, as indicated in Fig. 10.

Slabs such as thus far set forthspecitically can be produced in advance ot the time of use and stored in any quantity. In

many cases, however, it is preferred to form the slabs successively in place on the roadway, and in doing this thin metal, edgeforming members such as shown in Fi 5 are used. These are or may be formedg by providing a plane metal sheet, shearing it from its lower margin upwardly at intervals corresponding to t-he width ot the projections and recesses above mentioned, the cuts extending upwardly to a line as tar below the upper edge as the distance bev tween the upper and lower-f limits ot the shoulder 15. At this line, the parts 18, 19 between the cuts are bent alternately in opposite directions at an angle corresponding to the slope of the upper surfaces of the projections 16; and if desired, triangular pieces 20, perpendicular to the plane of the incut margin of the sheet, are secured to the end margins of the laterally bent portions 18, 19. This st-ructure is placed upright upon the base which is to support the slabs, and is usually supported laterally upon one side by stakes 21, 22. Plastic Mld concrete is then placed upon the opposite side of the form and brought up to its upper edge. If this be allowed to set, the form could be removed and used again, but is preferred to leave it in place and add concrete upon its opposite side to form a second slab.'

Preferably this form is perforated as at 23 to allow the passage of reinforcing lo-ngitudinal rods 24 passing obliquely through this member from a horizontal plane near the lower side of the slab to a parallel plane near the upper side of the companion slab, as shown in Fig. 3. Other reinforcing rods 25 are placed near the planes just mentioned and transverse with respect to the rods iirst mentioned.

Instead of the form shown in Fig. 5, the forms of Figs. 6, 7 or 8 may be used, the plane sheet having the same upper margin al portion as before, but the lower part being formed by pressing portions 26, 27, Fig. 6, or 28, 29, Fig. 7, or 30, 31, Fig. 8, alternately to op-posite sides of the plane upper portion 32 of the sheet. These forms require greater initial outlay, but are simpler, and in the end less expensive.

Obviously, the metal form engages the concrete on each face in such manner as to aid in transmitting load strains. It is also clear that the shoulder avoids any thin edge of concrete that might crumble under traflic; and the method of insertin therein forcing rods seems to need .noex'p anation.

To provide for expansion ofthe pavement two duplicate edge-forming plates such as that of Fig. 5 for example, are used in certain joints where they are parallel and spaced apart, the intervening space being filled with asphalt or other yielding material 40, as shown in Fig. 4.

For allowing change in direction .of the edge-forming plate, its upper portion 32 may be sheared partly across, as at 33, Fig. 5, and if desired the upper edge of the metal form may lie at a short distance below the upper surfaces of the adjacent slabs, as indicated in Fig. 3.

What I claim is 1. A broad concrete paving slab having along one side, and at some distance directly below its upper face, alternating yprojections and recesses with their lateral faces perpendieular to said side and adapted to lie and closely lit in corresponding recesses and projections, respectively, along the margin of a companion slab.

2. A broad concrete paving slab having at its upper side a vertical edge surface and below that surface a horizontal series of spaced projections with downwardly and outwardly inclined upper faces and further having in the lower portion of the slab between Iconsecutive projections a series of recesses adapted to be occupied, respectively, by projections of a similar set on the edge of a companion slab in the same plane.

3. A broad concrete paving slab having at one edge, materially below its upper surface, a series of projections extending beyond the general line 0f said edge, and further having between said projections a series of recesses extending to the opposite side of said general line.

4. In concrete paving construction, the combination with a metal joint plate having a substantially erect upper marginal portion and below that portion segments bent alternately, in opposite directions to lie in downwardly divergent planes, of concrete slabs, in a plane, fitting opposite sides of said joint plate, respectively.

5. A concrete paving slab having above near one margin a shoulder extending downwards t0 some distance from its upper surface and provided with a series of projections having inclined upper surfaces extending obliquely downward and outward from said shoulder, and further having between said projections recesses adapted to receive like projections on a companion slab, a thin metal .plate being placed between the margins and fitting both.

6. The combination with two contiguous concrete slabs each having inclined portions which project into corresponding recesses in the lower part of the companion slabs edge, of a metal plate :between said margins and litting both, and reinforcing rods passing obliquely from the lower portion of one slab, through the interposed plate and held in the upper portion of the other slab.

In testimony whereof I hereunto aiix my signature.

EDWARD K. TRIOL.

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