US1862426A - Sheet piling - Google Patents

Description

l June 79 w. PRlElrlPP SHEET FILING Filed Aug- 28' 193 vll* :L M

Inra/M07 am @MW @y Awa/QM@ Patented-,June 1932 UNITED s'ra'rlss- A wurm rnramr, or DORTMUND, om

SHEET FILING Application led August 28, '17930, Serial No. 478,479, and in Germany August'jt, 1929.

This invention relates to sheet piling wall constructions and more especially to those of Z or double-bent section form, its chief object being to provide a method and means of increasing the moment of resistance ofthe same. Y

It is well known that diiiculties in rolling make it impracticable to form Z or doublebent sections of any great length and/or cross-sectional width and that the formation thereof is limited by the diameterof the rolls generally used in the-rolling mills. However, since Z sections of sheet piling having a high moment of resistance areoften rei quired, other waysand means must be found to meet requirements and conditions. The present object is.so to do by providing a method and means of increasing the moment of resistance of such pilmg,`and accordingI thereto given airs of piling members have each combine therewith at least one reinforcing member. j

The invention will be best understood by further description with reference to theattached drawing illustrating several practicable embodiments by way of-example and wherein:

Fig. 1 is a cross-sectional or top plan view of two assembled Z-shaped sections forming part of a wall and showing the combination therewith of a reinforcing member according to the invention; l

' Fig. 2 is a similar view of a somewhat different arrangement Fi 3 is another showing a combination of the i eas of the preceding two figures;

Fig. 4 is a further'similar view illustrating l. a modification based upon the 'idea Yof Fig.

40 Fig. 5 represents va longlintudinal section through a piling wall accor to the invention', making further exemp cation of the application of the invention. t inay facilitate understanding at the outset to lain thatin the ramming of one y section a r another, vthere is tendency to rotate around a central longitudinal axis and this tendency leads-to an irregular formation of the wall with resultant decrease in resistive power. There is also tendency ofthe sections pulling apart or breaking the connection between each other during the ramming and this leads to considerable' diiliculty,

as also delay in properly constructing the wall. 1t is the purpose of thisjinvention to' 55 provide a `method andmcans of eliminating 4 these two great objections, Ythesame being done in a very simple but most efficient way. In the embodiment illustrated in Fig. 1,

two sheet piling sections of Z-shape form are v00 shown with their side flanges or longitudinal c dges a and b connected in a joint c by interlocking of claw and bulbous portions fitting together. Combined with these isshown an A I section d applied at the outer side thereof so as to press against their joint or line of union for substantially the full length thereof. This backing or reinforcing member prevents relative rotation of the sections and adds rigidity with greatly increased resistive 'I molnent to thewall. In Fig, 2, a different-form of reinforcing member embodying a fiat plate 'y is shown similarly applied to the side flanges e and f of corresponding sections, the opposite 15 flanges l1. and i of which have similar but only half-sized reinforcing members Ic and l applied thereto. A combination of these two ideas is shown in Fig. 3, wherein I sections d (like those shown in Fig. 1) `'are combined 80 with the side flanges a, b and m. of interconconnected sections, these members being welded or otherwise secured to the section ends or not as desired. i

v Fig. 4V shows a modification in which a B5 plate t is applied to the side'iianges of assem- Abled pairs of sections as in Fig. 2, while palrs of ball and socket Vplates n and o are received at their opposite flanges, the latter being for the purpose of insuring better gludance and a0 stability in ramming into place.

Fig. 5 illustrates a longitudinal section .through a sheet piling wall backed upV by iilling material pat one side andrb water at the other. Thiswall islield bac as 4,by an anchor brace indicated at g. vInra case of thiskind, the reinforcing members or late irons (being flat in this example) whic 1ncrease the moment-of resistance need beroe. ,i vided only inthe region and 'at theV lev m- `ll'lll dicated at r in this figure, but are not then driven into the ground or bottoms as ordinarily and as really preferred. The sheet piling wall itself is represented at s.

It will be understood that the reinforcing members may comprise plates or sections of various kinds and forms.

AThe above described method and means of construction :provides a trough-shaped sectional wall of considerably higher moment of resistance than is otherwise obtainable with Z sections. Carrying the idea a step further, it is `possible to combine the parts in substantially unitary and more rigid structures by welding or otherwise connecting together along the ianges forming the locking joints and reinforcement braces. Such a welding is represented by the spots denoted Y by fw between the overlapping portions of sections and reinforcement members. In each figure, the reinforcing member braced against a connected pair of sections at one side is shown joined unitarily therewith by welding at and between its longitudinal edges, being thus made rammable therewith as if the three parts were merely one'. The half-sized members` (7c and l.) at the other side of the wall may likewise and similarly be welded to the opposite flanges of the sections to permit ramming therewith as unitary parts. In the modification of Fig. 3 however, where the reinforcing member at 'said opposite side is of full size and bears against the joint with another section, the welding is shown effected only along one-half of its bracing surface so as to permit ramming as a part of each unit and yet enable other sections to'be connected and rammed therewith.

This welding together has the advantage of making the axis of gravity coincide more or less exactly with the'neutral axis of the piling. As an alternative, only one side fiange of a section in each case need be combined with a reinforcement members such as described. In the case of such arrangement the axes of the individual sections will be displaced to some extent, but this displacement would not be objectionable or give rise to any diilculty, inasmuch as the axis of the wall itself would not be displaced.

Of course, it is unnecessary to increase the moment of resistance of all the assembled pairs of Z-sections. vThe reinforcement may be restricted to the points or areas where heavier loads or stresses occur. On theother hand, it is not always essential that the attached rein forcing members should extendthe entire length .of the piling members. In some instances it may be suiiicient to apply the increased resistance only to certain points or areas where the greatest moments or stresses occur as represented in Fi 5, so that the piling members will become 1n effect beams of `uniform resistance to flexation.

It must be emphasized as an extremely great advantage, that the invention enables a theoretically perfect basis to be established for calculating the moment of resistance, and especially in thel parts most subj'ected to stress, where an uncertain basis of calculation leads in most cases to a waste of material. The invention accordingly enables, for the first time, a satisfactory basis to be estab lished for the economic employment of Z- sec'tion sheet piling members and especially in the case of walls in which local loads or impacts (such as the bumping of vessels) are to be expected. These loads may be of temporary or permanent character.

Having thus described my invention, what I 'claim as new and desire to secure by Letters Patent of the United States is 1. The method of increasing the moment of resistance of sheet piling walls formed by Z-shaped sections interconnected in pairs,

which consists in applying a reinforcing backing member against the side anges or longitudinal edges of each pair at and along vthe point of connection with each other on opposite sides of the walls neutral axis so as to prevent relative rotation of the members and tendency thereof to pull' apart during ramming into place.

v 2. The method of increasing'the moment of resistance of sheet piling walls formed by Z-shaped sections interconnected in pairs, which consists in applying a backing and reinforcing plate-member against the longitudinal edges of each pair along their line of union, or connection on opposite sides of the walls neutral axis and welding said backing and reinforcing members to the section ends.

3. A sheet piling wallv comprising a series of Z-shaped sections interconnected longitudinal edge-to-edgel and reinforcing backing members applied against said edges thereof along the lines of jointure so as to prevent relativerotation in ramming.

4. A sheet lpilin wall according to claim 3, wherein the rein orcing and backing members comprise I-shaped sections which may be secured to the section edges for greater strengthening.

5. A sheet piling wall comprising a series v of Zlshaped sections interconnected longitudinal edge-to-edge and reinforcing back-u connected flat `plate-members joined and rammed together therewith. v

7. A sheet piling wall according to claim 5, wherein the reinforcing members on oneside of the neutral axis comprise I-shaped beam sections and those on the other side comprise interconnected flat plate sections joined and rammed together therewith to insure proper guidance. r

8. A sheet piling wall according to claim 52 wherein the reinforcing members at'either s1de of the, neutral axis are welded to the section edges against which they bear.l

9. A sheet plling wall comprising a series of Z-shaped sections connected longitudinal edge-to-,edge having combined backing and reinforcing members applied to bear against said edges thereof on opposite sides of the walls neutral axis; those on one side of said axis comprising unitary plate-members and those on the other side comprising interconnected plate-members and the same being of a length to produce an effect similar to that of a girder of uniform resistance to Hexation.

10. A sheet piling wall comprising a series of Z-shaped sections connected lon 'tudinal edge-to-edge having combined bac ing and reinforcing members bearing against said edges along the lines of interconnection on opposite sides of the walls neutral' axis; those at one side comprising i'lat plate-members and those at the other side comprising interconnected plate-members which may be welded to the section edges for greater securing and strengthening if desired.

In testimony whereof I ailix m'J signature.

WALTHER PR ELIPP.

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