US1666250A - Cribbing - Google Patents

Description

April 17, 1928. 1,666,250

E. c. ALEXANDER CRIBBNG Filed May 23, 1925 Patented Apr. 17, 192s.

1,666,256 UNITED STATES PATENT OFFICE. l

EARL C. ALEXANDER, OF CHICAGO, ILLINOIS, ASSIGNOR T0 MASSEY CONCRETE PRODUCTS CORPORATION, 0F CHICAGO, ILLINOIS,y A CORIORATION OF VIRGINIA.

CRIBBING.

Application led May 23, 1925. Serial No. 32,249.

The present invention relates to cribbing, such as is used in the construction of retainwall, railway embankments, piers, etc.

- ne of the objects of the invention is to provide cribbin comprising a particular construction ang arrangement of stretchers and interlocking headers in which the outer faces of the interlocking headers lie substantially Hush with the outerfaces of the headers. There is thereby provided a relatively smooth cribbing wall unbroken by projecting ends or heads. The projection of these ends or heads of the headers from the surface of the wall is objectionable, as these projecting portions reduce the permissible over-all width of the cribbing where space is an important factor. Furthermore, they do not provide a neat appearing construction and are objectionable for other reasons.

It is a further object of the invention to provide a construction of cribbing in which the headers interlock the stretchers against longitudinal shifting movement, and also interlock the stretchers against outward displacement from the cribbing wall.

A further object is to provide a construction of cribbing utilizing stretchers and headers of comparatively simple sectional form in which the cost of-molding and reinforcing by suitable metal reinforcement is reduced to a minimum.

Referrin to the accom anyin drawing, wherein I ave illustrate a pre erred embodiment of my invention Figure l is a front elevational view of cribbing constructed in accordance with my invention;

Figure 2 lis a vertical sectional view throlgh the cribbing or wall shown in Figure Figure 3 is a perspective view of the ends of the stretchers and headers showing the relation of their assembly.

R ferring now to the drawings, in whch like reference characters indicate like parts in the several views, l() indicates the headers, which are all of the same character, and 12 indicates the stretchers. stretchers may be employed in the front and rear tiers of the cribbing, ifV desired, but I nd that the one standard design of stretcher, hereinafter described, is suitable for both the front and rear tiers, and standardizes the parts.

The headers 1Q are substantially rectangu- 'the ends of the stretchers.

Diferent forms of lar in cross' section, as illustrated in Figure 3, and are rovided at each end thereof with T-shaped eads 14 consisting of upwardly and downwardly extending shoulders or flange portions 15. These T-shaped end portions 15 extend to a depth substantially equal to one-half of the vertical height of each stretcher 12. The reverse sides of. these T-shaped portions 15 are sloped, as indicated at 16, to facilitate assembly and to get the necessar strength to the portions 15. The longitu inal body portions of the headers 10 are suitably reinforced b rods or wires 18, preferably disposed adjacent the 'corners of the headers, as shown in Figure 3, and this reinforcing may be extended upwardly and downwardly into the T-shaped end portionsl 15, if desired. However, by

lvirtue of sloping the reverse sides of these projecting portionsl, as indicated at 16, the extension of this reinforcing into these projecting end portions l5 is not essential because of the additional thickness of these end (portions where they'r join with the longitu inal portion. It wil be evident that this form of T-shaped head can be molded with ease in "a relatively inexpensive form of mold because of the absence of all lateral projections on the header. Both ends of each header are, of course, similar in construction and arrangement, having the same form of T-shaped end portions 15-15 provided with sloped inner Walls 16.

The stretchers 12 are preferably rectangular in cross section throughout their length, as illustrated in Figure 3. At their ends these stretchers are formed with rabbets or notches 21 recessed in their front faces. These rabbets or notches 21 extend inwardly to a depth approximately equal to one-half the thickness of the stretcher leaving interlocking tongue portions 22 extending from These. extending tongue portions 22 are of ample thickness to leave the requisite strength for in-m,

terlocking the stretchers against outward displacement under the pressure of the dirt and lling material pressing outwardly on these stretchers. The notches or recesses 21 have a longitudinal depth equal to approximately one-half of the crosswise thickness of the headers 10. These stretchers 12 are' reinforced by any suitable reinforcing rods or wires 24. and, if desired, the reinforcin rods or wires located adjacent the inner si es of lio the stretchers may be extended into the projecting tongue portions-22. 1t will be understood that the opposite ends of the stretchers 12 are similar in construction and arrangement, both havingthe notches vor rabbets 21 formed in their outer faces.

lin constructing a retaining wall such as shown in Figure 2, a front and rear series of stretchers 12 are first laid upon the ground with the end tongues 2 2 substantially contacting end to end between the stretchers. lln order to obtain the proper inclination of the completed retaining wall where such is desired, the rear series of stretchers is disposed on a lower plane than the front series of stretchers/ U on these series of stretchers are then p aced the headers 10, the lower 'lV-shaped end portions l 15 being set into the adjoining recesses 21 in the ends of the stretchers. Upon this series of headers is then placed another tier or layer of stretcher bars, the end tongues 22 of the stretcher bars being placed behind the upwardly extending T-shaped end `portions 15 of the header bars. This process is continued, placing the stretchers on top of the headers, and the headers on top of the stretchers, in much the same manner a rail fence might be constructed, until ythe wall has reached its required height. Due to the simple character of the header and stretcher bars the wall may be readily constructed by unskilled workmen, and in fact, may be readily constructed by a single workman if the individual bars are ,made of such a size that one man. can handle them. Where the wall is to be vextended up to a *considerable height, a secondary or supplemental course ,of headers and another course of stretchers ma be provided at the rear of the first course for reinforcing and supporting the first course in the process of construction. After this construction of cribbing has been erected, the wall or embankment is filled in with dirt, gravel or any other lling material which serves to bind all of the header and stretcher bars to ether.

llt will be lnoted rom Figures 2 and 3 "that the engagement of the 'lf-shaped end portions 15 1n the recesses21 of the adjoining stretchers will interlock the headers to the stretchers to prevent outward displacement of the stretchers under the pressure of the :illing material, tending to force the stretchers outwardly. llt will also be noted that the abutment or substantial abutment of the shoulder 21 at the end of each notch or recess 21 against the lateral face ofthe T-sha ed end portion 15 will interlock the .stretc ers 12 against any longitudinal shifting movement relative to the headers. flFhere are necessarily certain discrepancies introduced in the erection of cribbing of this t e, and particularly the s acing between t e front and rear courses o the stret- Leeaaae chers as the cribbing progresses. The sloped rear sides 16 tend to alleviate difculties which might arise in this regard, as these sloping sides. enable the ends of the T-shaped portions 15 to be dropped into the recesses 21 where the spacing between the front and rear stretchers of the uppermost layer somewhatexceeds the intended spacing between the stretchers. The sloped rear sides 16 venable these T-shaped end portions 15 to" be started in the adjoining recesses 21, and thereafter, the weight of the headers and the successive tiers of stretchers will force the sloped rear walls downwardly along the forward edges of the extended tongue portions 22 until the `stretchers rest `upon the upper surfaces of the stretchers.

It will be observed from Figures 2 and t that after the cribbing is completed all of the T-shaped end heads 14 of the stretchers lie in the recesses 21 of adjoining stretchers and there are no projections protruding from the face of the cribbing.

Having thus described my invention, what ll c aim is:

1. A cribbing structure comprising a plurality of headers having fshaped ends and having .dat sides, and a plurality of stretchers of rectangular shape lying transversely and alternately on said headers and having sufficient of the ends of said stretchers removed to form 'a complementary space for receiving said 'lf-shaped ends.

2. A cribbing structure comprising a plurality of headers having rectangular crosssection, T-shaped ends and dat sides, and a plurality of stretchers of rectangular shape lying transversely and alternately on said headers and having sufficient of the ends of said stretcher's removed to form a complementary space for receiving said T-shaped ends.

3. A cribbing structure comprising a plurality of headers having rf-shaped ends and dat sides, and a plurality of stretchers of rectangular shape abutting each other, end to end, and having an outer portion of ends of said stretchers removed to form a complementary space for receiving said 'l1-shaped ends, said headers and stretchers being laid alternately and transversely upon each other.

4. A cribbing structure comprising a plurality of headers having dat top and bottom bearing surfaces at each end transversely projecting end ortions and dat sides, said end portions being vertically disposed, and a plurality of stretchers having bottom and top flat bearinor surfaces co-operating with the said hea er bearing surfaces, said stretchers abutting each other end to end and presenting a front surface iiush with the ends of said headers.

5. A cribbing structure comprising a plurality of headers having dat top and bottombearing surfaces at each nd and transversethe first named bearing surfaces, said 1y projecting end portions of rectangular stretchers abutting each other. end to end cross-section decreasing in size toward their and presenting a front surface iiush with the 10 ends, said end portions being vertically disends of said headers.

5 posed and said headers having iat sides, and In witness Whereof,1 hereunto subscribe a. plurality of stretchers having bottom and my name this 19th day of May, 1925. top fiat bearing surfaces co-operating with EARL C. ALEXANDER.

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