Патент USA US2259374код для вставки
Oct. 14, 1941. C'. u. GRAMELSPACHER 2,259,374 ROAD CONSTRUCTION Filed oct. 8, 1958 2 sheets-sheet 1 öuapnce Duessmß F151. 2 7 Tau. on. O\\_ 5TONE_ov. CoNcle-rs EHQTH Wonu BED INVENToe 0¢t- 14, 1941. ` c. u. GRAMELsPAcHER Í ï 2,259,374 ROAD C‘ONS TRUCTION Filed Oct. 8, 1958 ‘ 2 Sheets-Sheet 2 Cmnmce U. GnaMiLsPacHm ‘ Patented Oct. 14, 1,941 2,259,374` AUruTeo STATES " PATENT OFFICE 2,259,374 ' ` ROA-D CONSTRUCTION >Clarence U. Gramelspacher, Jasper, Ind. Y Application October 8, 1938, Serial No. `233,992 rc1. »s4-4) '1 Claim. This invention Vrelates to the construction of roads and pavements, and more particularly to monly observed in bituminous aggregate con structed -roads and pavements. Another object is to provide a roadway having a road or pathway constructed of wood or timber ‘in the form of plies, together with an appropriate binder and ñller material. laminated wood slabs positioned beneath the traveled surface of the highway in order to pro The invention consists in providing a road or pavement of b-uilt-up layers comprising a rigid waterproof base with plywood laid thereon to form the body of the roadway with a mastic waterproof surface coating covering the top and sides of the plywood. -d-uce an anti-rippling roadway. the drawings: Figure 1 'is a perspective view of the construc To ` tion' of V~the roadway showing the diiferent layers ithereof; ` VFigur-_e -2 is a cross sectional view of the roadway Wood in the form of blocks has been used here tofore in the construction of pavements. In this 'orïpavement constructed according to this in-- type of pavement construction, however, wood , 'blocks are exposed directly to the Wear of trafiic as well as the surrounding climatic conditions. The wood block is usually treated with creosote oil to preserve the wood and prevent the absorp tion of water which causes swelling. Treated wood, however, will absorb some water and only i* by thorough and proper treatment can this be reduced in amount so as to obviate trouble from Fig-ure `Bjis an elevation view of the road surface prior -to applying the surface dressing; swelling. . vention; Eig-ure 4 `is -a -View similar to Figure '3, illustrat :ing `the cutting and laying of the timber em ployed; > rFigure 5 is a fragmentary view in section of the plywood sheet or block employed, showing the cross grain arrangement of the diiferent plies; ‘ Figure 6 Vis a sectional view of a modified road Aside from the difficulties encountered by swell ing, wood block pavements exhibit a high degree of slipperiness when wet which is very objection able. Bituminous bonded road surfaces, asphalt pavements and the like are superior to Wood in construction similar to that illustrated in -Figure 2, with certain parts broken away. Referring to the drawings in detail, the nu meral 1 designates a roadbed which is shaped to conform to the surface of the finished roadway this respect but are inferior to wood in the re or pavement. Over the roadbed is applied a sistance offered to wear under heavy traffic con- ' waterproof coating 8 of tar, oil or the like. Any ditions. Further, due to the pushing force or pressure exerted against the surface of asphalt or bituminous pavements, by motor vehicle traf waterproofing substance may be employed, but ñc, distinct waves or bumps are produced. Some times this occurs in recently built pavements. To overcome this defect various methods have been devised involving a more careful selection of materials and more expensive road construc tion, but the problem has not been entirely solved. This invention overcomes these defects and pro vides a highly improved road or pavement con struction. ' An object of this invention is to provide an improved pavement or road construction which preferably a tar or heavy oil product of coal gas, water gas or coke oven is used. Creosote oil or equivalent heavy oil may be employed either alone or mixed with tar. A mixture of tar and creosote oil is somewhat superior as a water proofing agent to either of these substances alone. After the application of a waterproof coating to the roadbed surface, a layer of stone or con 40 crete 9 is applied thereover of desired thickness and then another waterproofing layer 8 of tar, oil, or a mixture thereof, is disposed over the surface of stone or concrete. This seals the con crete, rock or stone section against the penetra is inexpensive to build, highly resistant to dis 45 tion of moisture or seepage of water from sur tortion under traffic, and very durable. rounding earth. Upon the waterproof layer 8 is Another object of this invention is to provide placed a sheet 0r covering Iû of building paper, an improved roadway or pavement which utilizes the combination of wood and a suitable surface libre, plastic or pulp board in order to present a smooth, regular surface forming a cushion for dressing to produce a highly improved, inexpen 50 the plywood slabs Il laid thereon. In some in sive roadway or pavement. stances the paper or libre board covering may be Another object is to provide a road wherein omitted. As an alternative the cushion layer I0 the body of the highway surface comprises ply may comprise a bituminous mastic of hot tar or wood. Such a roadway is highly resistant to asphalt mixed with sand. Sand may be omitted impact and surface distortion and raveling com 55 and tar alone used as another modificationl 2 . 2,259,374 The plywood slabs II, as shown in Figure 5, comprise alternate cross-grained laminated plies way or pavement. The space between the outer edges of the plywood II and the concrete shoul der I4, as at I5, will be filled with tar or the surface dressing I3 employed to cover the ply wood in the construction shown in Figures 1 and 2. In this way the plywood will be thor oughly sealed from the atmosphere and main tained waterproof. of relatively thin sheets of wood IIa held to gether by glue or resinous material I2 conven tionally employed for this purpose. For pro viding greater rigidity the central plies can be made thicker than the outer sheets. The dimen sions of the plywood slabs may be varied; in As a further modification the surface coating general, however, they are of sufficient width to extend across substantially one-half the road 10 I3 may comprise concrete or brick. If desired a combination of concrete and brick sealed with way surface. Two such slabs are laid with their tar or equivalent material may be employed as a ends abutting together at or near the center of surface dressing for the plywood. In this con the road as shown in Figures 1 to 4, and covered with surface dressing. Due to the cross grained laminated construction of , the ply-,-Y wood expansion of the slabs is compensated for and no special joints need be provided. Therply wood slabs may be laid eitherY Yparallelto> the > nection, the terms “bonded aggregate” refers to the Yuse of cement for binding the aggregate as well as bituminous or other suitable agents. In the construction of roadways and pave ments as disclosed by ths invention, comprising embedded plywood slabs, a resilient highway is curb, similar to the manner of laying brick, or diagonally, as illustrated in Figures 3 and 4, re 20 provided which is exceedingly durable and is con siderably less expensive to build than the con spectively. f Y vention-al hard surface roads. ' Over the layer of plywood is ap'plied a surface It »is understood, of course, that this inven dressing I3 of bituminous bonded aggregate. tion is not limited to the exact details of con Mineral aggregate employed for this purpose Amay be crushed stone, slag, gravel, grout, and 25 struction since obvious modiñcations may be made by persons skilled in the art Within the the like, the particles smaller than [email protected] inch in diameter being omitted. Preferably aggregate scopevof the disclosure and appended claim. - Having thus fully described by invention, what I claim asnew and desire to secure by Letters of hot bitumen or asphalt mixed with coarse 30 Patent is: An improved roadway or pavement construc sand may be applied directly over the plywood tion comprising a roadbed surface having a ifr desired with or Awithout the use of other ag--_ Waterproof coating thereover, a hard road foun gregate. This construction makes the pave having particles ranging in size from 1/2 «to 1% inchesin diameter is used. A surface dressing dation surface layer laid thereon, a waterproof ment thoroughly waterproof and provides for somel slight expansion of the wood inlaid therein. 35 coating disposed over’said hard foundation sur face, a cushion layer of sheet material laid over The wood or'timber plies making up the ply said waterproof coating, cross-grained plywood wood are preferably treated with preservative, such as copper sulphate, zinc chloride, bichloride of mercury and creosote to prevet the attack of .wood destroying fungi and insects. ì In the modification shown in Figure> 6 the outer margins of the plywood slabs abut against a concrete shoulder I4 which may be extended to form the curb and gutter adjacent the road slabs disposed on said cushion layer, and a waterproof road surface dressing cover layer ap 40 _pliedoverthe top and side surfaces of said ply wood, said plywood being thoroughly sealed against contact with water. CLARENCE U. GRAMELSPACHER.