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Publication numberUS2655846 A
Publication typeGrant
Publication dateOct 20, 1953
Filing dateSep 23, 1948
Priority dateAug 14, 1945
Publication numberUS 2655846 A, US 2655846A, US-A-2655846, US2655846 A, US2655846A
InventorsEugene Freyssinet
Original AssigneeEugene Freyssinet
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Large sized concrete area adapted for airplane runways and the like
US 2655846 A
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Description  (OCR text may contain errors)

Oct. 20,- 1953 E. FREYSSINET H LARGE SIZED CONCRETE AREA ADAPTED FOR AIRPLANE RUNWAYS AND THE LIKE Filed Sept. 23, 1948 a: I A.

W g f lnvenTor Eugene Freya-finer I wuim, M, GM: *1! wwim/i Patented Oct. 20, 1953 LARGE SIZED CONCRETE AREA ADAPTED FOR AIRPLANE RUNWAYS' AND THE LIKE Eugene Freyssinet, Neuilly-sur-Seine, France Application September 23, 1948, Serial No. 50,814 In France August 14, 1945 1 Claim. (o1. 94-8) This application is a continuation-in-part of my pendin application, Serial No. 650,814.

The object of my invention is the .production of large plane concrete surfaces adapted to carry heavy, concentrated loads, such surfaces consistingbasically of large slabs each individually prestressed in two directions, and bearing on a foundation over the whole area. The slabs are also as free as possible to slide upon their bearing area.

Another object of my invention is to avoid, as far as possible, the breaking up of these slabs due to variations of temperature and humidity.

A further object is to obtain highly resistant areas with a thickness of concrete which is much less than that used as present.

For the production of a pavement according to my invention I use slabs whose ratio of minimum linear dimension to thickness is not less than 200:1, the thickness being between cm. and cm. (6"-10"). In practice each slab is of a roughly square shape with sides of the order of 100 yards in length.

I arrange these slabs on the ground on a foundation which gives rise to the least possible friction, and, if the margins are to be subjected to loading, I support them on especially strong separate foundations. This latter foundation is indispensible particularly at the joints between two slabs; thus the foundation is the support for the expansion joint between two slabs.

The margins of the slabs rest on their foundations just as in the case of the central part, in such a way as to ensure the maximum ability to slide. The simplest way of achievin this object is to provide a thin layer of some plastic or viscous fibrous material such as bitumen-impregnated paper or felt, between the slab and the foundation. Preferably this layer of plastic material should lie, in the center of the slab, on a thin bed of sand properly levelled and spread out over the foundation soil.

For the individual prestressing of each slab, I use by choice a square mesh network of reinforcing rods in tension, whose ends are anchored in the edges of the slab. However, in some cases I induce a compression in the slab in at least one direction parallel to its surface by means of thrust against two abutments running parallel to and touching two opposite edges of the slab. This compression can be obtained by wedging, or, preferably, by some pneumatic or hydraulic system contained in at least one of the joints between the slab and the abutments.

The attached drawings show diagrammatically certain embodiments of the invention.

I Figure 1 is a diagrammatic plan view of a concrete area according to the invention;

Figure 2 is a large-scale diagrammatic plan view of a part of this area, and

Figure 3 is a view on line III-III of Figure 2.

The slabs A, B, C, shown in Figure l, have a square-mesh network of reinforcing rods 22-23 which are inclined with respect to the sides of the slabs in opposite directions. These slabs are disposed in end-to-end relationship with their adjacent end sides slightly spaced apart to provide fora gap D. The end portions of the slabs rest on a concrete foundation [3.

The concrete foundation I3 is prestressed 1ongitudinally by means of reinforcing rods M which are anchored in the usual Way at its ends. It carries the two edges of the slabs through a sandwich layer ll of some plastic or viscous material. The layers II are extensions of those which cover the sand-bed i5 placed on the ground surface to carry the central part of the slabs. Thus, the slabs can slide freely on their foundations as well as on the ground between these foundations.

The space H between two slabs is filled with some material relatively plastic, for example soft wood blocks impregnated with pitch, and with the grain running vertically.

As illustrated moreclearly in Figures 2 and 3 in which adjacent end portions of two successive slabs F and G are shown, the reinforcing rods 22 are bent, in the vicinity of the space II, as at 22a and then extend parallel to the rods 23.

The reinforcing rods l8 consist of cables covered in such a way as to prevent bond with the concrete, for example being in tubes III or covered with .paper or bituminous paint.

In the region [8a the wires forming the cables are spread out in the form of a cylinder with a vertical axis in such a way as to give each wire of the cable a good bearing on the concrete and to avoid local shear effect.

The reinforcing rods (or cables) 22 and 23 are subjected, after the concrete has set, to considerable tensile stress, for instance, by means of jacks acting on their free ends which protrude from the concrete structure. This tensionin action can be performed since the rods are not directly embedded Within concrete, but are surrounded by a sheath Ill. At their ends, the various wires or strands 9 of the rods (or cables) 22 -23 are flared out in conical formation, against the wall of a frusto-conical end recess 19a in a block l9.

been described, the ground is trimmed and lev- V elled, then the foundations 13 are laid, and then the layer of sand I5 is spread onthe ground be-' tween those foundations. The sand and the foundations are then covered with the plastic or viscous layer ll upon which the slabs are cast individually after placing the reinforcing rods.

It should be noted that tensioning the rein-- forcing rods after the setting of the concretecan be elfected by allowing the tensioning apparatus to'bear directly on the concrete of the slabs themselves. V @The sliding bed upon which each slab bears over its entire surface allows relative movements between the slab and the ground. These movements are of two types, an initial sliding due to the elastic contraction of the concrete at the time of prestressing, and secondly, slidin in servicedue to the effect of variations of temperature and humidity.

Having thus described the invention, what is claimed as new and desired to be secured by LettersPatent is:

A -concrete pavement of large area capable of v carrying concentrated loads and. in particular an air-strip for heavy aircraft, consisting of at least one rectangular slab, a primary series of parallel tensioned reinforcing rods embedded in said slab equally spaced, inclined to one side of rectangle, and a second series of parallel tensioned reinforcing rods embedded in said slabs, equally spaced and crossing the first series, the reinforcing rods of each set which approach the end edges of the slab being curved in the neighborhood of these latter edges and extended in a direction parallel to the other set, the ends of all rods beinganchored on the opposite side edges of the slab.

EUGENE FREYSSINET.

References can in the file of this patent UNITED STATES PATENTS 2,338,785 Sommerfeld Jan. 11, 1944

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US1507282 *Apr 14, 1923Sep 2, 1924Cushing Hammatt WilliamPavement
US1739102 *Oct 27, 1921Dec 10, 1929Strauss Joseph BPavement
US1740119 *Jul 16, 1926Dec 17, 1929Robinson John WSidewalk, roadway, and the like
US1809870 *Nov 16, 1927Jun 16, 1931Walter F BossertConcrete reenforcement
US2174035 *Jul 1, 1936Sep 26, 1939William P WitherowSidewalk, floor, or roadway construction
US2251672 *Jun 4, 1936Aug 5, 1941Bengt F FribergMethod of casting concrete pavements
US2315894 *Oct 16, 1940Apr 6, 1943Crom John MConcrete construction
US2319105 *Jun 17, 1942May 11, 1943Billner Karl PMethod of reinforcing concrete bodies
US2329189 *Sep 2, 1941Sep 14, 1943Dill Richard EReinforced concrete construction
US2329670 *Jun 27, 1941Sep 14, 1943Valles Sanchez Jose MariaProcess for making pavements and the like
US2338785 *Oct 23, 1941Jan 11, 1944Joachim Sommerfeld KurtConstruction of roads or runways
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2852991 *Dec 3, 1953Sep 23, 1958Preload Co IncPrestressed pavements
US2950517 *Jun 6, 1955Aug 30, 1960Brickman Alan EMethod of making post-stressed reinforced cement-concrete structures
US3000276 *Dec 30, 1957Sep 19, 1961British Cellophane LtdConstruction of concrete rafts, roads, aircraft runways and the like
US3022713 *Nov 26, 1954Feb 27, 1962Friberg Bengt FPrestressed concrete structures
US3024991 *Sep 4, 1956Mar 13, 1962Gen Dynamics CorpCost calcultor
US3057270 *Mar 20, 1959Oct 9, 1962Henry Lee DonovanImprovements in and relating to stressed concrete slab structures such as airfield runways and the like
US3072994 *Aug 23, 1960Jan 15, 1963Brickman Alan EApparatus for making post-stressed reinforced cement-concrete structures
US3182109 *Aug 17, 1962May 4, 1965Greulich Gerald GMethod of making prestressed concrete pavement
US3237358 *Jun 11, 1962Mar 1, 1966Mcalpine & Sons Ltd Sir RobertHigh-pressure storage vessel constructed of pre-stressed concrete
US3237537 *Jan 17, 1964Mar 1, 1966Hutchings Carl HPrestressed concrete highway
US3272096 *Apr 2, 1963Sep 13, 1966 Roadway structure and method of making same
US3287475 *May 6, 1963Nov 22, 1966Laclede Steel CompanyMethod of constructing continuously reinforced concrete slabs
US3403492 *Feb 21, 1966Oct 1, 1968Spencer Francis DudleyConstruction of concrete liquid reservoirs such as swimming pools
US4125580 *May 2, 1977Nov 14, 1978Dyckerhoff & Widmann AktiengesellschaftProcess for the manufacture of pretensioned carriageway slabs
US4191490 *Aug 25, 1978Mar 4, 1980Barnett, Haynes & Barnett, InternationalPrestressed concrete roadway
US4245923 *Sep 13, 1978Jan 20, 1981Rieve Johann JPrestressing and prestressed road pavements
US4621943 *Oct 9, 1984Nov 11, 1986Vsl CorporationContinuous prestressed concrete and method
US6409423 *Mar 15, 1996Jun 25, 2002Ran LiPrestressed pavement system
DE973528C *Dec 29, 1954Oct 6, 1960Dyckerhoff & Widmann AgFugenausbildung fuer lange, duenne, nachtraeglich vorgespannte Betonfahrbahnplatten
Classifications
U.S. Classification404/70, 264/228
International ClassificationE01C11/04, E01C7/16, E01C7/00, E01C11/02
Cooperative ClassificationE01C11/045, E01C7/16
European ClassificationE01C11/04B, E01C7/16