Патент USA US2131794код для вставки
0a. 4, 19%. ¢_ 5, CUSHWA' TUNNEL LINER SEGMENT Original Filed Dec. 13, 1953 2,131,794 V2,i31,794 UNITED STATES PATENT owes ‘ Patented‘ Oct. 4,1938 TUNNEL LINER SEGMENT ' Charles B. Cushwa, Youngstown, ‘Ohio, assignor to The Commercial Shearing & Stamping Com pany, Youngstown, Ohio, a corporation of Ohio Original application December‘13, 1933, Serial No. 7‘02,l88.~ Divided and this application Septem ber 20, 1935, Serial No. 41,435 . 1. Claim. (01. 61—45) segment ID is shaped by pressing, drawing, or My invention relates to linings for earth bor ings and, in particular, to fabricated linings hav- ' otherwise, from a single plate; The side and end ing greater strength than such structures as edges of the plate are bent downwardly to'form side flanges H and end ?anges l2. A stiffening ' known heretofore. This is a division of my copending application‘ rib I3 is formed adjacent the center of the web Serial‘No. ‘702,188, ?led December 13, 1933, for portion !4 of the segment, i. e., the portion be Tunnel liners, now Patent No. 2,046,727, granted. tween the side and end ?anges. The rib I3 is formed by slitting the web portion l4 adjacent Linings for earth borings, for example, tun- . the end ?anges, as shown at 15, and'pressing in .10 nels, as usually constructed, include ‘a plurality wardly the 'web material between the slits. The 10 of rings disposed side by side and secured to rib 13,701c course, greatly increases the rigidity ‘July 7,1936. ' ’ gether, each ring being formed of an assembly of. segments. The loads sustained by such lin of the segment lengthwise, as compared'to a ' segment without the rib. ‘ ings are not uniform as to‘ distribution ‘or di- ,. ‘ Figures 5 through 8 show another form of seg ment indicated at 20., The segment 20 is pressed 15 lining have great strength in order to withstandv from a single ‘plate like the segment l0 but has separately formed end walls 2|. Theweb of the loads which may be’ concentrated -at any par ‘ rection and this fact makes it essential that the the? segment 20 is bent to form side ?anges 22. The intermediate portions .of the web are doubled ticular area. While numerous types of segments for linings have previously been proposed, prac 20 tically all of them with which I am familiar have 20 back‘on themselves to‘form ribs or plaits 23 ex tending longitudinally of the segment. The end walls 2| are attached to the ends of the segment has ‘been vthe fact that many of them relay on . by welding. It will be apparent that the length bent-up ?anges to transmit circumferentially ‘of wise rigidity and strength of the segment of Fig the lining from one segment to itsneighbors, the ures 5 through 8 are even greater than those of 2 the segment of Figures 1 through 4. Thenum radial force which may happen to befconcen - trated thereon. It is obvious that‘ a bent ?ange ber‘ of ribs 23 may be varied to suit different has a very low resistance to further bendingand conditions and the longitudinal strength and rié is, therefore, a highly inefficient means for trans 'g‘idity of the segment will vary correspondingly. mitting radial hrusts from one segment to ad A particular advantage of the'construction shown so ' jacent ‘ segments. in Figures 5 through 8 is that the ribs 23 abut I have invented a novel form of pressed steel against the end Walls 2| and therefore provide segment from which tunnel linings may be ‘ase substantial support against inward bending of v been characterized .by weak points. One of the points of greatest weakness in prior structures sembled. 3 the end walls which might otherwise result from The segment of my invention is char- ' acterized, by great strength circumferentially of a completed lining ring for transmitting stresses the circumferential forces set up by stresses ra dial to the completed tunnel lining. 35 . applied radially of the completed lining. The It will be apparent from the foregoing de segments, ‘furthermore, .are very‘ rigid through-_ .scription that my invention provides a number out their length. An embodiment of the inven- ' of forms of liner segments characterized by. greater strength than those known heretofore, 40 40 tion is shown in‘the accompanying drawing, to gether with a modi?cation thereof,,_although the particularly with reference to the resistance of the segment to bending of the ?anges thereof drawing is merely illustrative and does not rep resent the only forms in which the inventionmay relative to the body portion. WhileI have illustrated only a few possible em be incorporated. In’ the drawing: . Figure l is a plan View of a segment according 45 to my inventiony . Figure 2 is a side elevation thereof; Figure 3 is an end view; ' shown and described herein without departing from the spirit ofv the invention or the scope of “Figure 4 is a sectional view along the line 50 IV—IV of Figure 1; Figure 5 is a view similar to Figure 1 a modi?ed form of the invention; showing ' v Figure 6 is a side elevation thereof; Figure '7 is an end view; and ‘ . the appended claim. 50 I claim: 7 A liner segment comprising a ‘plate curved - along one. dimension, side walls extending in-‘ Wardly of the curved edges of the plate, said plate having a plait forming a strengthening rib ex Figure 8 is ‘a sectional view along the line VIII-VIII of Figure 5. bodiments of the invention, it will be apparent that it may be otherwise constructed than as ' ‘ Referring in detail to the drawing, and for the present, to‘ Figuresv 1 through 4 particularly, a tending inwardly of the plate to substanitally the depth of said side walls and end walls welded to the ends of the side Walls and of the plait. . ' . ‘CHARLES B. CUSI-IWA.