US1705612A - Underpinning and method of making the same - Google Patents

Description

March 19, 1929. s. 'GOODER UNDERPINNING AND METHOD OF MAKING THE SAME I Filed Oct. 26, 1927 r of the foundationv of the building,

' same on the outer side.

Patented Mar. 19, 1929.

s T T tieaelz UNDERPINNING an]: MnriHon or. MAKING rrin. SAME.

Application filed October 2a, 1927. Serial in). 228,717.

When an excavation is made beside a building, to a depth greater than the depth such foundation must be underpinned to prevent collapse.

foundation that does not rise to-the bottom of the old foundation. Jacks are then placed on top of the new foundation and the the top of the'newfoundation and the bot tom of the old is filled in, the jacks being removed as the filling progresses.

Sometimes there is considerable disturb ance of the bed on which the new foundation rests, before the" jacks may be removed.

Thus, for example, if piles are driven down the foundation and the wall'aboveit to reclose to this new foundationfthe top of the foundation will tend to swing outwardly,

due to the earth pressure on 'theinside and the failure of the support underneath the On account of the considerable space usually left between the top of the new foundation andthe bottom of the old, this space being bridged only by the removable jacks, the support for the original wall is very insecure and such wall may swing out at the bottom while the new foun dation moves out at the top.

' The object of the present invention isv to produce a simple and novel method ofun-. derpinning a wall so that the new founda-' tion may be brought much closer to thebottom of the old foundation, before the jacks are applied, than has heretofore been possible, thereby securing much greater stability and lessening the danger of lateral 'deflection while excavations are being made or other work done beside the new foundation.

The various features of novelty whereby my invention is characterized will herein after he pointed out with particularityun the claims; but, for a full understanding of my invention and of'its objects and advantages, reference may be had to the folof what may be termed a nut 5 having. at the lowing detailed description taken in connection with the accompanying drawing, wherelnz Y The usual method is to build underneath the wall to be supported a new,

Figure l is an elevation of a fragment of i a wall supported by jacks from a new foundation in accordance with the present invention; Fig. 2 is" a view similar to Fig. 1 showing the condition of the foundation after removal of the jacks; Fig. 3 is a vertical sectiontakenthrough the wall and underpinning at right angles to the plane of Fig. '1; Fig. 4 is aplan view 'o'f one ofthe supporting plates for the jacks; andFig. 5

is a side'elevation of one of the jacks, its

plate being shown in cross-secthe foundation and the old wall, the foundation cannot be brought up into contact with the bottom of the old wallin the first instance. As heretofore stated, it has been customary to leave enough space between ceive ordinary screw jacks. I havedevised a wayof greatly shortening this: distance so as to bring the two wall structures'more nearly .into contact with .each other: 'Inaccordance with my invention I form in the top of the new foundation a series of pockets opening downwardly. and open on one or bothfsides of the foundation. :These pockets are conveniently in the formbf slots extending completely through the foundation@ When theffoundation has set'sufficiently to permit the weight of the, build ing to be imposed on the same, I place jacks in the slotsor notchesor pockets, suspending these acks from the upper ends of their bodies or bases, instead of supporting them from "their lower ends. sinceonly-a small part of the base or stationary portion of the jack needlie above the top of the new foundation, the founda;

' tion may be brought to withina'distance from the bottom of the building wall not much greater than the height of the top of screw is down. 1 t 9 Thefiyacks may takevarious forms. Thus, as shown 1n Figs; land-5, 1t may consist top a'fiange- 6 and, underneath the flange, a radial lug 7 the usual jack sorew .8, with Therefore, v

the movable portion of thejack above the top of the stationary portion when the a hole 11 to permit the passage of the 'body' the two parts thereof, namely the jaclc of the nut 5 but not .the flange, and a notch 12 adapted to receive the projection 7 and prevent the nut from turning. WVhen a jack is to be placed in position,

:proper. and the auxiliary base, are assembled,w;ith the flange resting in the bottom ofithe channel of the auxiliary base and the jack screw screwed down as far as it will go.

-This unit is then placed opposite one of the slots or notchesand is moved laterally so i that the channel passes over the top of the foundation and the main portion of the screw andthe lower portion of'thenut of the jack enter the notch or slot.

-Allowing for clearance, to permit the easy application and removal "of the jacks, only a few inches of space need be left between the topwof the new foundation' and the underside' of the old, whereas prior, practices have made 1t necessary to leave a space several feet high.

1 When the new foundation is subsequently to be 'completed, tlie jacks are removed a few at a timeand the notches in thernew foundation and the intervening spacerbetween the 'latter and the bottom of the-old foundation are filled, preferably with con crete, asindicated at13 in Fig. 2; the dotted line 14 representing the contour of "the new ffoundation as initially built, an dithe line 15 overcoming the necessity of employing socalled drums as the body members of jacks, will be apparent from inspection of Fig.3.

It will be seen that if theusual type of jack,

indicating the top of the completed new foundation andthe bottom of the old wall or foundation.

The-utility of my invention, asidefrom were set on top of the new foundation, this foundation would haveito stop at about the ,level ofthe bottom of the groove, causingr new foundationon;comparatively long struts the original wall to be supported from the or posts. In accordance with my invention,

however, the eifective'top of the new foundation is very near the underside-of the old wall, so as to 'permit the employment of very short supporting elements or posts. 'Whi'le I have illustrate-and described with -particularity only a single preferred form of my invention, I do not desire to be, lim-v ited to the-exact structural details thus illustrated and described; but intend to cover all forms and: arrangements which come within the definitions of my lnventi'on constl- 'tuting theappended claims. I l

I claim 1. The method of underpinning a wall preparatory to making an excavation beside the't-op, placing on the foundation members each having a stationary base element spanning one'of the notches and a vertically movable power element extending through the base element and down; into the corresponding not'ch, and; adjusting said power elements to causethe weight ofthc wall to be imposed upon the same. p 7 c 2. The -method of underpinning a wall and temporarily supporting the same, which consists inbuilding underneath and up to "within a short distance below 'the wall a foundation having notches in the top thereof, placing on the foundation members each having a stationary base element spanning one of the notches and a vertically"movable power element passing through the base element and extending down into the correspondin notch, andadjusting said power elements to cause the weighmf the wall to be imposed upon the same and the wall to be held at the desired level whenthe foundation settles. I l a i 8. The method of underpinning a wall and temporarily supporting the same which con sists in building underneathand up to within a distance less thanlthe height ofa'j'ack screw below the wall a foundation" having notches inl the topland opening out ofthe side thereof, inserting between the foundation and the wall jacks each comprising a base member restingon lthev foundation at opposite sides of one of the notches and a screw extending into the corresponding notch, and operating the jacks to cause the weight of the wall to be imposedupon the screws. I I I 7 4. The method of underpinning a wall and maintaining thelatter at the desiredlevel during settling of the underpinning, which consists in building up'to within a distance less than the'height ofa. jaelcs'cr'ew below the Wall afoundationhavingnotchesin the topand opening out of the side thereof, in sorting between the foundation and the wall jacks each comprising a basemember rest ing on the wall at opposite side's o f one of the notches and a ack screw extending into the corresponding notch, ad usting the .screws to cause the weight of the wallto be imposed thereon, and thereafter making such .tain the wall at the desired level.

In testimony whereof, I sign this specification.

SETHM. eoonn'a.

l a'djustments ofthe screws, during settlingof the foundation as may be necessary to main-

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