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Publication numberUS2922283 A
Publication typeGrant
Publication dateJan 26, 1960
Filing dateMay 19, 1958
Priority dateMay 19, 1958
Publication numberUS 2922283 A, US 2922283A, US-A-2922283, US2922283 A, US2922283A
InventorsPorter Fred S
Original AssigneePorter Fred S
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Excavation shoring devices
US 2922283 A
Abstract  available in
Previous page
Next page
Claims  available in
Description  (OCR text may contain errors)


FRED S. PORTER t m dlinr 5 United States Patent M EXCAVATION SHORING DEVICES Fred S. Porter,'Taber, Alberta, Canada Application May 19, 1958, Serial No. 736,130 1 Claim. ;(Cl. 61-.41) i V This invention relates to a shoring deviceor unitfor pipe line excavations and has for its principal object the provision of a shoring unit which can be hydraulically expanded and contracted to accommodate excavations of varying width; to provide a unit in which the sides may be hydraulically rocked and tilted to loosen the unit from the side Walls of the excavation so that it may be quickly and easily withdrawn; and to so construct the shoring unit that a plurality of units may be superimposed upon each other to accommodate exceedingly deep excavations. i Other objects and advantages reside in the detail construction of the invention, which is designed for simplicity, economy, and efliciency. These will become more apparent from the following description.

In the following detailed description of the invention, reference is had to the accompanying drawing which forms a part hereof. Like numerals refer to like parts in all views of the drawing and throughout the description.

In the drawing:

Fig. 1 is a perspective view of the improved shoring unit in a partially expanded condition;

Fig. 2 is an enlarged cross-section therethrough; and

Fig. 3 illustrates the unit as it would appear lifted from place in an excavation.

In Fig. 3, the side walls of an excavation are indicated at 11, the bottom thereof at 12, and the ground line at 10.

The improved shoring unit comprises two similar horizontally-elongated sheet metal side plates 13 and 14. A horizontal reinforcing tube 15 is welded to, and extends longitudinally of, the side plate 13. A similar reinforcing tube 16 is similarly welded to, and extends longitudinally of, the side plate 14. The reinforcing tubes 15 and 16 are positioned medially of the side plates and project at their extremities oppositely outward beyond the end of the plates. A plurality of vertical stiffening braces 17 are horizontally spaced along the side plate 13 and a plurality of similar vertical stiflening braces 18 are horizontally spaced along the side plate 14. The stiffening braces may be of any desired cross-section but are preferably formed from hollow square metal tubing bent in a flat V-shape so that they will cross the reinforcing tubes 15 and 16 on the inside of the latter and extend outwardly at their extremities to the planes of the side plates. The stiffening braces are welded to the reinforcing tubes and to the side plates.

The upper and lower edges of the side plate 13 are turned inwardly over the extremities of the stiffening braces 17 to form top and bottom flanges 19. The upper and lower edges of the plate 14 are similarly turned inwardly to form top and bottom flanges 20. A mediallybent protecting plate 22 extends between the flanges 20 and over the surface of the stiffening braces 18.

The structural elements 13, '15, 17, 19 and 21 are all rigidly welded together to form a complete first side I Patented Jan. 26, 1960 ICE , 2 wall member of the improved shoring device and the members 14, 16, 18, 'and'22 are similarly rigidly welded together to format complete second side wall member of the improved shoring device. The two side members are adjustably connected together at their extremities by 'meansof extensible cross members. Each cross member comprises an outer telescoping tube 23 into which an inner telescoping tube 24 is slidably fitted. Each outer tube 23 projects from a first tube sleeve 25 and each of the inner tubes 24 projects from a similar second tube'sleeve 26. T he first tube sleeves 25 are movably fitted overthe projecting extremities of, the reinforcing tube 151 and each sleeve can be locked against rotation on thetHbe i-I'S byineans of a first locking pin 27 which canbei-iiiserted through thesleeve 25 andjthe tube 15. Eacli of the second sleeves 26 is similarly movably fitted over the projecting extremities of the reinforcing tube 16 and each can be locked against rotation thereon by. means of, a second locking pin 28. Each inner tube 24 eanbe locked at any. desired longitudinal position in its surrounding outer tube 23 by means of a I An upperihydiaulic cylinder 31 is. mounted on an upper hinge pin 32 in the upper extremitybf the terminal stiflening brace 18 at each extremity of the side plate 14 and a hydraulic plunger 33 extends from each upper hydraulic cylinder 31 to an upper hinge pin 34 in the upper extremity of the terminal stiffening brace 17 of the opposite side plate 13. A similar lower hydraulic cylinder 35 extends from a lower hinge pin 36 adjacent the lower extremity of each terminal stiflening brace 17 and a lower hydraulic plunger 37 extends from each lower hydraulic cylinder 35 to a lower hinge pin 38 adjacent the lower extremity of each terminal'stifiening brace 17.

The hydraulic cylinders and their plungers provide an upper and a lower hydraulically expansible device at each extremity ofthe shoring unit. The hydraulic cylinders 31 and 35 are of the double-acting variety and each is supplied with hydraulic fluid from fluid feed pipes 39 positioned between the plates 14 and 22 through the medium of suitable hydraulic hoses 40. Hydraulic fluid is fed to the feed pipes 39 from any suitable adjacent hydraulic pump and hydraulic hoses (not shown) as is customary with hydraulically operated equipment.

A hanger member 41 extends upwardly from the inner edge and at each extremity of the upper flange 20 and a similar hanger member 42 extends upwardly from the inner edge of each extremity of the upper flange 19. The hanger members 41 and 42 are adapted to receive hoisting chains 43 extending from any suitable hoist apparatus 44.

In use, the complete unit is lowered into the excavation until the lower flanges 19 and 20 rest upon the excavation bottom 12. The third locking pins 29 are then removed and hydraulic fluid is simultaneously introduced into all of the hydraulic cylinders 31 and 35 to force the two side members of the shoring device oppositely outward to bring the side plates 13 and 14 tightly against the side walls 11 of the excavation. If the excavation is to be continued downwardly, the entire device is allowed to descend as the bottom 12 is lowered and if necessary, a second shoring unit is positioned on top of the first unit so that it will be held in alignment therewith by the upstanding hanger members 41 and 42.

The side plates can be hydraulically brought against the wall 11 with any desired pressure and when the desired separation has been reached, the third locking pins 3 29 are placed in position so that the use of the hydraulic fluid can be discontinued.

When the use for the excavation has been completed, all of the locking pinst27, Z8 and 29' can be withdrawn to provide a completely flexible unit. 'Hydraulicfluid can then bealternately admitted to the upper cylinders 31 and the lower cylinders35 to rock or tilt the .side plates back and forth about the axes of the tubes 15 and 16 so as to loosen them from the sidewalls of theexcavation. The device can then be hydraulically collapsed to the position of Fig. 3 and quicklylifted from the excavation. 7

Should an accidental cave-in occur whichtmight bury the shoring device, all of the locking pins and pivot pins may be withdrawn to completely separate the side wall. Should the excavation cave or lfill in at the bottom as indicatedat 45 in Fig. 3, the shoring device can be narrowed at the bottom as shown in broken line in .Fig. 3 to allow it .to assume an inverted ti-shape for easy removal. 1

While a specific form of the improvement has been described and illustrated herein, it is to be understood that the same may be varied within the scope of the appended claim, without departing from the spirit of the invention.

Having thus described the invention, what is claimed and desired secured by Letters Patent is:

A shoring device for excavations comprising: two horizontally elongated substantially vertical side plates; a

reinforcing tube secured to and extending horizontally and medially along the inner face of each side plate; a

vertical stiffening member extending between the upper and lower edges of and at each extremity of each side plate to resist bending of said side plates in a vertical plane; a cover plate extending from the upper edge of each side plate downwardly and inwardly over the stiffena ing members and over the reinforcing tube to the lower edge of the side plate; a sleeve mounted on each extremity of each reinforcing tube; telescoping members connecting the sleeves on one side plate to the sleeves of the other side plate; means for presetting said telescoping members at selected positions of extension; an upper hydraulically expansible device extending from a stiffening member of one plate to a stiffening member of the opposite plate above said reinforcing tubes and at each extremity of said shoring device; a lower hydraulically expansible device extending between said latter stiffening members below said reinforcing tubes; and means for independently actuating said upper and lower hydraulically-expansible devices to tilt said side plates about the axes of said reinforcing tubes.

References Cited in the file of this patent UNITED STATES PATENTS 251,698 Coats Jan. .3, 1882 686,536 Rheubottom Nov. 12, 1901 2,796,738 Moore June 25, 1957

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US251698 *Oct 7, 1881Jan 3, 1882 William e
US686536 *Aug 4, 1900Nov 12, 1901Frank C RheubottomGrave-curbing device.
US2796738 *May 17, 1954Jun 25, 1957Moore Ira HTrench cribbing
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3029607 *May 1, 1959Apr 17, 1962Millerbernd Paul ADevice for preventing cave-ins
US3224201 *Aug 11, 1960Dec 21, 1965Speed Shore CorpShoring apparatus
US3230720 *May 2, 1960Jan 25, 1966Sigma Engineering CorpTrench shoring device
US3331210 *Aug 24, 1964Jul 18, 1967Wenninger Robert EShoring structure
US3362169 *Dec 21, 1964Jan 9, 1968Maria Groetschel KarlRoof supporting systems for mine workings
US3479827 *Feb 26, 1968Nov 25, 1969Morrice Anthony R STrench shoring frame
US3593528 *Dec 15, 1969Jul 20, 1971Pavese John RSafety trenching box
US3693358 *Mar 22, 1971Sep 26, 1972Morrice Anthony R STrench shoring frame
US3710578 *Mar 4, 1971Jan 16, 1973Hirose Steel Ind Co LtdMethod for constructing frame for retaining earth
US3782126 *May 22, 1972Jan 1, 1974Pavese JStressed skin safety trenching box
US3858399 *May 11, 1973Jan 7, 1975Krings JosefSheeting arrangement
US3931956 *Nov 21, 1974Jan 13, 1976Hawkins Wallace HHoist
US4019329 *Feb 9, 1976Apr 26, 1977Griswold James LTrench shoring assembly
US5096334 *Sep 28, 1990Mar 17, 1992Plank Michael JShoring shield
US5499890 *Jul 8, 1994Mar 19, 1996Americ CorporationTrench shoring device with locking mechanism
US5868526 *Oct 7, 1996Feb 9, 1999Caulder; Richard AustinTrench shield
US8845238 *Nov 23, 2011Sep 30, 2014Roger F. FontaineTrench box and panel assembly therefor
US9033619 *Dec 16, 2013May 19, 2015John Riggle, JR.Trench shoring apparatuses
US9127429 *Oct 23, 2012Sep 8, 2015John David PateukDevice for supporting the walls of an excavation
US20140169889 *Dec 16, 2013Jun 19, 2014John Riggle, JR.Trench shoring apparatuses
USD736961 *Nov 21, 2013Aug 18, 2015Lite Guard Safety Solutions Pty LtdShield panel
USD737474 *Nov 21, 2013Aug 25, 2015Lite Guard Safety Solutions Pty LtdShield panel
USD755410 *Aug 21, 2013May 3, 2016Lite Guard Safety Solutions Pty.Shield panel
USRE30185 *Apr 10, 1978Jan 8, 1980 Trench shoring assembly
EP0027200A2 *Sep 29, 1980Apr 22, 1981FERCOS di PIZZIRANI, CesareApparatus for encasing excavations
U.S. Classification405/283
International ClassificationE02D17/06, E02D17/08
Cooperative ClassificationE02D17/08
European ClassificationE02D17/08