Патент USA US2109025код для вставки
Feh. 22, 1938. R. IRVlN CRIBBING STRUCTURE Filed Dec. '7, 1936 ' 2,109,025 2,109,025 Patented Feb. 22, 1938 UNITED STATES PATENT OFFICE A 2,109,025 CRIBBING STRUCTURE Richard Irvin, Pittsburgh, Pa. Application December '7, 1936, Serial No. 114,661 4 Claims. (Cl. 61-47) This invention relates to a cribbing structure of the type embodying a frame work of assem bled beams to be ?lled with earth, stone, rubble or the like, for supporting and retaining em 5 bankments of cuts, ?lls and excavations, and for foundation walls, retaining walls, or analogous work wherever applicable, of either a permanent or temporary nature. 1 Important objects and advantages of the in lU vention are to provide a cribbing structure of the character described, which employs precast cribbing members constructed of concretive com~ position material rendering same most durable and particularly adapated for use in cribbing 1-5 structures of a permanent nature, which em bodies novel means for maintaining the associ ated cribbing members in their relative positions, and which is not affected by any untoward weather conditions. 20 Further objects of the invention are to pro vide a construction of the class stated, which is simple in its construction and arrangement, which may be readily erected or removed, which combines minimum Weight and maximum 25 strength, and which is comparatively economical in its manufacture, erection and maintenance. With the foregoing and other objects in view which will appear as the description proceeds, the invention consists of the novel construction, 30 combination and arrangement of parts herein speci?cally described and illustrated in the ac companying drawing, but it is to be understood that changes in the form, proportions and de tails of construction may be resorted to that come 35 Within the scope of the claims hereunto appended. In the drawing wherein like numerals of ref erence designate corresponding parts through out the several views: Figure l is a front view, partly in cross section, 40 of a cribbing structure constructed in accord ance with the invention. Figure 2 is a longitudinal cross sectional view of a header beam. illustrating its connection with the stringer beams by the key blocks. 45 Figures 3 and 4 are perspective views of the key block and the connecting block, respectively. Referring in detail to the drawing i denotes a header beam and 2 represents a stringer beam. The header and stringer beams are constructed 50 in various lengths to meet any requirements and conditions found in practice. The beams I and 2 are substantially H-shaped in transverse cross section, having their upper and lower faces deeply recessed to form longi 55 tudinally disposed grooves, respectively indicated at 3 and 4, which are half-round and extend uni formly throughout the lengths of the beams. The construction of the header beam l and of the stringer beam 2 are preferably identical in con struction, excepting that each end of the gooves 3 of the header beams is closed by an end wall 5, while the ends of the grooves 4 of the stringer beams are open. Figure 1 illustrates a front view of cribbing work employing my improved header beams l 10 and stringer beams 2, which are arranged alter nately in parallel rows and in super-imposed re lation to each other. The stringer beams of each row are disposed horizontally in longitudi nal alignment with their adjacent ends abutted - 15 against each other. The header beams of each row are disposed at right angles with respect to the position of the stringer beams, and the ends thereof overlap the abutting ends of adjacent stringer beams. The assembly of the header and I ‘ stringer beams is identical in its arrangement to the practice now in common use in cribbing work. An integrally formed, substantially T-shaped key block 6, comprising a stringer cross-arm 1 and a header arm 8, is provided and employed for as looking together the abutting ends of the stringer beams 2 and the overlapping end of the header beam l. The arms ‘I and 8 are semi-cylindrical in transverse cross section, and extend at right angles relatively to each other. 1 One end of the F: ?at side of the header arm 8 joins with‘ the flat side of the stringer cross-arm 1, central of the length of the latter, and extends to but not be yond the outer edge of said cross~arm 1. The contour of the key block arms ‘I and 8 conforms to the contour of the grooves 3 and 4 in respective header and stringer beams l and 2. In the assembly of the cribbing structure, the cross-arms 1 of the key block 6 overlap the abut ting ends of the stringer beams 2 and engage in -i U the grooves 4 in the latter. The arms 8 engage in the grooves 3 of the header beams l, and the end walls 5 overlap and engage the connected end of said arm 8, as clearly shown in Figure 2. The engagement of the header arms 8 by the end walls 5 in the manner stated, prevents the spread ing movement of the stringer beams from their positions in connection with the header beams I. The key blocks are preferably cemented in posi tion in the grooves of the header and stringer beams, by a suitable bituminous asphaltic cement. Such mastic cement allows the slight movements attending the settling adjustments of the inter connected parts of the structure without liability 55 2 2,109,025 of fracturing said cement or said inter-connected parts. If for any reason it is required to close an opening between two adjacent rows of stringer beams, or between two adjacent rows of header beams, a ?ller beam of similar conformation may be employed. Suitable connecting blocks 9, either cylindrical, as shown, or spherical in contour, are engaged and cemented in the grooves of adjacent beams, whereby the ?ller beam is held in posi tion for material retaining or other purposes. All parts of the cribbing structure, including the header and stringer beams I and 2, and the associated key and connecting blocks 6 and 9, are constructed and precast of concrete embody ing any suitable concretive composition materials. Reenforcing rods H? are embedded in the beams and extend longitudinally in the latter to provide requisite strength and to allow reduction of their transverse cross sectional areas to a minimum for the conservation of weight. It will here be noted that, while the grooves 3 and 4 in the beams l and 2, are herein illus— trated and described as being half-round in transverse cross section, it is obvious that the con?guration of the grooves may be varied, and correspondingly shaped key blocks provided for use in connection therewith. However, the con tour of the grooves should be such that the ex 30 pansion of any matter in said grooves, due to freezing or other causes, will be outward to ward the open side of the grooves and will not act to apply force or pressure against any points or parts of the wall of the grooves, whereby the liability ‘ of fracturing the beams from such causes is entirely eliminated. The bottoms of the grooves 3 and 4 are provided with a plu rality of apertures II to permit the drainage of water therefrom that might accumulate in any 40 of the grooves. Under conditions when it is not feasible to use the key and connecting blocks 6 and 9 for lock ing the ends of the beams together in the manner set forth, a concrete mass of low slump consist 45 ency may be successfully employed instead of said blocks. From the foregoing description taken in con nection with the accompanying drawing, the construction and use of my improved cribbing 50 will be readily apparent to those skilled in the art to which the invention appertains, and while disclosing one embodiment of the invention, it is evident that the novel features thereof may be varied without departing from the spirit or sac ri?cing any advantages of the invention. What I claim is: 1. In a cribbing structure, the combination of a pair of stringer beams having their adjacent ends abutted against each other, a header beam disposed at right angles to said stringer beams and having an end thereof overlapping the abut ting ends of said stringer beams, said beams be ing constructed of reenforced concrete and be ing provided with longitudinally extending 1O grooves, said grooves having apertures extend ing through the bottoms thereof, and a T-shaped key block engaged in respective grooves for lock ing the adjacent ends of said stringer and header 15 beams together. 2. In a cribbing structure including stringer and hanger beams provided with longitudinally extending grooves, an integrally formed key block constructed of concrete and comprising a stringer 20 cross-arm, and a header arm disposed at right angles to said stringer cross-arm and having one end thereof joined with the center of the latter the transverse contours of said stringer cross arm and of said header arm respectively corre sponding to the transverse contours of the grooves of the stringer and header beams. 3. In a cribbing structure, the combination of a pair of stringer beams having their adjacent ends abutted against each other, a header beam 30 disposed at right angles to said stringer beams and having an end thereof overlapping the abut ting ends of said stringer beams, said beams be ing constructed of reenforced concrete and be ing provided with longitudinally extending grooves, and a T-shaped key block engaged in respective grooves for locking the adjacent ends of said stringer and header beams together. 4. In a cribbing structure, the combination of a pair of stringer beams having their adjacent ,40 ends abutted against each other, a header beam disposed at right angles to- said stringer beams and having an end thereof overlapping the abut ting ends of said stringer beams, said beams be ing constructed of reenforced concrete and be 45 ing provided with longitudinally extending grooves, said grooves being substantially half round in transverse cross section, and a T-shaped key block engaged in respective grooves for lock ing the adjacent ends of said stringer and header 50 beams together. RICHARD IRVIN.