US1906634A - Method and means of renewing column bases - Google Patents

Description

' May 2, 1933. x LEAKE 1,906,634

METHOD AND MEANS OF RENEWING COLUMN BASES Filed Oct. 24. 1951 5 Sheets-Sheet 1 May 2, 1933. A. s. LEAKE METHOD AND MEANS OF RENEWING COLUMN BASES Filed Oct. 24, 1931 3 Sheets-Sheet 2 fwgz away;

May 2, 1933.

A. G. LEAKE METHOD AND MEANS OF RENEWING COLUMN BASES Filed Oct. 24. 1931 5 Sheets-Sheet 3 Patented May 2, 1933 PATENT OFFICE ARTHUR G. LEAKE, OF BRIDGEPORT, CONNECTICUT METHOD AND MEANS OF RENEWING COLUMN BASES Application filed October 24, 1931. Serial No. 570,808.

This invention relates to renewing the bases for structural steel supporting columns, and has for an object to provide improved means and method of renewing the bases of these columns after they have become deteriorated. It is common for the bases of upright columns for supporting structural steel structures, such as elevated railroad tracks, viaducts and the like, to corrode and de-.

teriorate and permit the column to settle, and it is an. object of this invention to provide improved means and method whereby these bases may be removed and renewed even stronger than when originally built without tearing down or removing the column or the structure supported thereby.

With the foregoing and other objects in view the invention consists in certain novel features of construction and the method of assembling the various elements as will be more fully disclosed in connection with the accompanying drawings. It is, however, to

be understood that the invention is not limited to the details disclosed, but includes all such modifications and variations as fall within the spirit of the invention.

In these drawings:

Fig. 1 is a side elevation of a column base constructed and renewed according to this so invention, parts of the base plate being in section to more clearly show the construction;

Fig. 2 is a transverse section substantially on line 2-2 of Fig. 1;

Fig. 3 is a side elevation right of Fig. 2;

Fig. 4 is a perspective view of a base showing a slightly different arrangement of the elements;

Fig. 5 is a transverse section thereof substantially on line 55 of Fig. 4;

Fig. 6 is a perspective view of a base showing another slight variation in the arrangement of the parts;

Fig. 7 is a cross sectionsubstantially on line 77 of Fig. 8;

Fig. 8 is a front elevation of a column showing another modification;

Fig. 9. is a side elevation looking from the right of Fig. 8;

2.5 looking from the column illustrated in The top of the concrete Fig. 10 is a transverse section substantially on line 10-1O Fig. 11 showing the filler plate in plan view;

Fig. 11 is a partial side elevation and partial section of the lower portion of the column base;

Fig. 12 is a transverse section substantially on line 1212 of Fig. 13 and similar to Fig. 10 showing two filler plates in position; and

Fig. 13 is a view similar to Fig. '11 showing two filler plates in position.

In the illustration the base is shown as used for the upright supporting column for a structural steel railway viaduct, but of course, is adapted for use in any similar column used for supporting any structure. The

Figs. 1 to 6 is of a simple built-up type of structural steel elements and comprises four upright angle members 10 connected on opposite sides by the usual lattice work 11, and on the other two sides by the upright connecting plates 12. It is, however, to be noted that this specific construction of column is used merely for illustration, as my construction of the base and method of renewing is equally adapted 'for renewing columns built up of other structural shapes. such for example as upright channel members etc. and .is used in the same manner.

In renewing these column bases the supporting structure is first jacked up and supported either by the jacks or a built-up framework while the base is being renewed. The old shear plates and the base plates which have given away or corroded are removed, and if the lower end portions of the uprights 10 have deteriorated they are also cut ofi and renewed and new angle or channel sections welded tothe lower end of the remaining upright portions 'to restore the original length. base 18 is cleaned ofi and one or more filler plates 14 and 15 are applied on thetop of this base to give the required height. These filler plates are made in three sections, a'central wider section 14 of a width to extend substantially the distance between the anchor bolts 17, and two narrower outside sections 15 to complete the necessary width of the plate and having notches 18 for the anchor bolts. If more than one seetional filler plate is used the adjacent plates will be set at right angles to each other as shown by the dotted lines in Fig. 12, that is, if another filler plate isplaeed on the top plate 11-15 the sections will be turned at right angles to the sections of the first tiller plate so that the joints between the sections will not be in alignment.

On top of the'filler plate is placed the baseplate 19 which is a continuous plate having openings for the anchor bolts 17. After these filler plates, if any, and the base plate are in position the ends of the uprights 10 rest on the top of the base plate and are preferably welded thereto. The lower corroded end portions of plates 12 are removed and extensions 12a welded thereto as indicated at 9 and also to the uprightslt) and base plate 19. Also on the other sides of the column the uprights 10 are connected by plates 23 welded thereto as indicated at 23. These plates 23 extendfor a suitable height above base plate 19 in place of the usual lattice work. The joints between the sections of the tiller plates and also the filler plates and the base plate are welded to seal up these joints and securely connect them together. Then the upright wing or shear plates 20 are welded at their edges to the uprights 10 or the connecting plates 12a as indicated at 21. This welding is extended along the entire length of these upright edges and on both sides oft-he plates. Then angle members 22 are placed to extend between the plates 20 on each side of the column and with its upright flange against the plates 12a and angle members 22 are welded to the upright plates 20 as indicated at 24 and the upper edge of the upright flange is welded to the upright plates 12 and 23 as indicated at 25, while the free edge of the lower flange is welded to the top of the base plate as indicated at 26. If desired stifl'ener plates 27, preferably of substantially triangular shape, may be Welded at their edges to the upright and horizontal flanges of the angle members 22 as indicated at 28 and 29. I have shown but one of these stiffener lates between the wing or shear plates 20, but of course, the number may be more if found desirable.

In the form shown in Figs. 1 to 3, four corner filler plates 30 may be Welded diagonally to the upright faces of the plates 20 across the corners, their upright edges being welded to the plates 20 while their lower ends are welded to the base 19. Then four diagonally placed stiffener plates 31, preferably triangular in shape may be welded at their upright edges to the outer face of the plates 30, and at their lower edges to the top of the base 19. However, before these plates 31 are placed in position the tops of the anchor bolts 17 are burnt off to a suitable distance below the top of the plate 19 as indicated at 82, and then this end is welded to the sides of the opening 23. The ends of these '19 the same as in the first form.

.chor bolts 17 in the plate 19 and the opening filled in with welding metal flush with the surface of the plate 19 as indicated at 33 to securely attach the bolts to-the plate 19, and when the lower edge of the plates 21 are welded the bolts are also securely attached to these plates. The use of these dates 30 and 31 is optional. If the plates 3i are not used the anchor bolts may be built up to the proper height and the column secured on the concrete base by nuts as indicated at 43 in Figs. 4 and 5.

This completes the renewal of the column base, and it will be evident that this makes a. very strong, rigid construction, and one which when in position is even stronger than the original base as usually constructed.

A slightly different construction of base is shown in Figs. 4 and 5. In this form on two sides of the column there are two continuous wing or stiffener plates 31 taking the place of the lower renewed portions 12a of the plates 12. These plates 34 at their lower ends are substantially the full length of the base plate 19 and include upright tapered edges 35 so that the outer portions 36 of these plates, which are integral with the central portion of the plates, form the upright wing or shear plates corresponding to the two sets of the plates 20 of the form shown in Figs. 1 to 3. The connecting plates 23- eXtend between the other flanges of the uprights 10 the same as in the first form and are welded at their edges to the uprights 10 as indicated at 23. Angle members 37 extend between the tapered portions 36 of the plates 34 and are welded at their ends to these plates as indicated at 38, and the free edge of the upright flange is welded to the plates 23 as indicated at 39, while the free edge of the horizontal flange is welded to the base 19 as indicated at 40. Stifl'eners 27 may be welded between these flanges as in the first form. The upper edges of these plates 31 are welded to the lower ends of the plates 12 as indicated at 41 so that they in effect form continuations of these plates. After these plates are in position upright wing plates 20 are welded to the outer faces of the plates 34 as indicated clearly in Figs. 1 and 5, and angle members 22 extending between them are welded at their ends to these plates, and the top edge of the upright flange is welded to the plate 34 as indicated at 42, while the lower flange is welded to the top of the plate This construction is illustrated with the plates 30 and 31 omitted although they may be used if preferred. If they are omitted the an- .are built up to the proper height and threaded for the nuts 43.

In Fig. 6 is shown still another variation of the arrangement for the anchor bolts and the means of securing the column by means of these bolts.

this arrangement can be renewed the same The base of the column in I or as in Figs. 4 and 5. The specific showing, however, is the same as that in Figs. 1 to 3 except that the diagonal plates 31 are omitted. In place of these plates 31 two upright plates 44 are used at each corner on opposite sides of the anchor bolt 45, these. plates being welded at their loweredges to the surface of the plate 19 as indicated at 46, and at their rear ends to the upright diagonal plates 30. The bolts 45 extend up between these lates and the columns anchored by nuts 4 clamping on the washers 48.

In Figs. 1 to 6 two upright angles 10 connected by the plate -12 are in effect channel members with the flanges extending inwardly, but if the upright angles are connected by a plate on the inside of the column then it is preferred to use a somewhat different construction for the renewed base as shown in Figs. 7, 8 and 9. In these figures the column as in Figs. 1 to 3 comprises four'upright angles as in Figs. 1

to 6 arranged in two pairs. The angles are arranged however so that the outer flange 10a of each angle extends outwardly instead of inwardly, and the inner flanges'of each pair are connected by plates 49 so as to produce in effect channelmembers with their flanges extending outwardly The end flanges are connected by the usual lattice bars 11. At its lower end this column is shown in dotted lines at 50 extendingubelow the grade indicated at G, and this dotted line construction indicates the deteriorated base of the column which is to be first cutaway before a new column base is constructed to support the column. The old column base is indicated at 51 resting on the old concrete support or foundation 52. This base is supporting the column as orlginally installed.

In renewing this column base, however, the column shaft is cut off at substantially the grade or somewhat above it as indicated by the lines 53, and all the old column below this line down tothe top of foundation 52 is removed. After this has been removed the concrete column or base is built up as shown at 54 to the proper height indicated at 55. and then the base plate 56 is placed on it either with or without the filling plates 14, 15 as shown in Figs. 1 to 6, depending upon the distance between the top of the concrete column and the .lower cut off end of the structural column. After this base plate is placed under the column it is welded to the lower ends of the upright column members as indicated at 57 to secure complete bearing of these members on the base plate. Then two upright wing or shear plates 58 are welded to the outer flanges of the uprightchannels or angles 10, and also'welded at their lower ends to the base plate as indicated at 59. The edges'of the flanges of the angles 10 are welded to these plates 58 as indicated at 60. and the top edges of the plates welded to the flanges as indicated at 61. These plates 58 are similar to the plates 20 and 34 of Figs. 1 to 6 especially plates 34,'and have their outer edges 62 tapered as indicated. Then "two angle members 63 are placed in the angle made by the lower ends of the shear plates 58 and the base'plate 56,

and the vertical flange is welded at its free edge to the plate 58 as shown at 64, and the edge of the horizontal flange is welded to the base plate 56 as shown at 65. The ends are also welded as shown at 66.

On the other sides of the column between the plates 58 are placed'angle s 67which are I welded at their ends and top edges to the angles 10 as indicated at 68 and to the base plate 56 as indicated at 69. As the plate 49 is set back from the upright flange of the member 67 by the thickness of the flange of the angles 10, if it is desired that the, upright flange of angle 67 be welded to the plate 49, then a filler'plate 70 of the proper thickness can be welded to the face of the plate 49 between the angles 10 and the upper edge of the vertical flange of angle 57'can be welded to this filler plateas indicated at 71.

Thus it will be evident that this construction makes a strong unitary structure and efi'ectively renews thebase of the column so that it is as strong or stronger than when originally built. The column can be effectively anchored to the concrete foundation 54 by any suitable number of anchor bolts 72 anchored in the concrete and extending through the base plate 56 and the horizontal flanges of the angle members 63.

It will readily be seen that this construct ion of base can also be used if the old base is'at grade level or at any other level, and can be used to renew the bases of columns of the type shown in Figs. 1 to 6. It will also be evident that the bases as shown in Figs. 1 to 6 can be used for renewing-old bases built at grade level, below grade level, or at any other level.

It will be evident from the foregoing description that this makes a very simple construction of column base, and may be built in position on the job without tearing down the column or the structure supported thereby. As a matter of fact the supported structure may be used without interruption while the column bases are being renewed. After the base-has been renewed as described it is even stronger than the base as originally installed in standard practice.

As the uprights 10 connected by the plates 12 and 49 are in effect built up channel members it will, of course, be obvious the same structure and method may be used for renewing the bases of columns in which the uprights are rolled channel sections. It is also to be understood that the column structures shown are merely for illustration and that ture regardless of the specific forms of the upright members, whether they are for example, angles, channels, I-beams, or other shapes.

Having thus set forth the nature of my invention, what I claim is: I

1. A base for a column. including upright structural steel members, comprising a base plate under said members, upright stiffener plates welded at one edge to the said members, and angle members extending between the stiffener plates and of a width to extend substantially to the edge of the base plate, and said angle members being welded at their ends to said stiffener plates and along their edges to the said members and to the base )late. I 2. A. base for a column including upright structural steel members, comprising upright connecting plates extending, between the upright members and welded thereto, a base plate under the uprights, upright stiffener plates welded at their edges to the uprights and the base plate, and angle members extending between the stifi'ener plates and of a width to extend substantially to the edge of the base plate, and said angle members being welded at their ends to these stiffener plates and along their edges to the uprights and the base plate.

3. A base for a column including upright structural steel members, upright side plates connecting said upright members, a base plate under the uprights, upright wing 'or stiffener plates welded at an edge to said plates and uprights, angle members extending between the wing lates and welded at their ends thereto an also along their edges to the base and side plates, upright filler plates extending between the wing plates at thecorners and welded at their edges, thereto, and upright stiffener plates extending transversely the filler plates and welded at their edges to these plates and the base.

4. A base for a column including upright structural steel members, including a base plate, an upright plate connected to the up rights on opposite sides of the column, said upright plates extending at their opposite edge portions beyond the uprights to provide wing plates andwelded at their lower edges to the base plate, other upright wing plates extending laterally from and welded at their upright edges to the first upright plates and at their lower edges to the base wing plates on each side of the column, said angle members ofa width to extend substantially to the edge of the base plate and being welded at their ends to the wing plates and along their upper and lower edges to the connecting plates and the base plate respectively.

5. The method of renewing bases of structural steel supporting columns including uprightmembers which consists in'bringing the column supported structure to grade and maintaining it there, removing the deteriorated lower portion of the column, inserting a base plate under the column, welding upright shear plates to the upright members and-the base plateand welding angle members to the shear plates and the base plate, all said welds being made while the structure is supported at grade.

6. The method of rcnewingbases of structural steel supporting columns including upright members which consists in raising to and supporting the supported structure at the finished level and maintaining it at this level while performing the following operations, removing the corroded shear plates, base plate and lower end portions of .the uprights, renewing the lower ends of the uprights by welding in similarly shaped sections, inserting a base plate under them, welding connecting side plates to the uprights, welding spaced upright wing plates to the column on the various sides thereof, and welding angle members between the wing plates on each side and 'to the base and connecting plates.

7. The methods of renewing bases of structural steel supporting columns including upright members which comprises supporting the supported structure at the finished level and maintaining it at this revel while performing the following operations, removing the corroded shear plates, base plate, and lower end portions of the uprights, renewing the lower ends of the uprights bywelding in similarly shaped sections, inserting a base welding connecting side plate under them, plates to the uprights, welding spaced uprighttapered wing plates at their upright edges to the column and their lower edges to the base plate, and welding stiffening members between the wing plates.

8. The method of renewing bases of structural steel supporting columns including upright members which comprises supporting the supported structure at the finished level and maintaining it at this level while performing the following operations, removing the corroded shear plates and base plate, in serting a base plate under the uprights, welding the ed of upright spaced tapered wing plates to t e sides of the column and the base plate, and welding horizontal angle members at their ends to the wing plates and the edges of their flanges to the connecting plates and base plates respectively.

9. A base for a column including upright structural members, comprising a base plate under said members, upright stiffener plates on opposite sides of the column and welded along their upright edges to the uprights and along their lower edges to the base member, horizontal angle members of a width to extend substantially to the edge of the base plate welded at their ends to the stiffener plates and along their edges to the base plate side sections having and upright members, and horizontal angles between the stiffener plates of a width to extend substantially to the edge of the base plate and welded at their edges to the uprights and the base plate.

10. A renewed base for a'column including upright structural steel members including a filler plate under the column comprising a central section adapted to be inserted between the anchor bolts, and side sections adapted to be inserted laterally from opposite sides toward the central section and provided with notches in their inner edges to receive the anchor bolts, said sections being welded to each other and the column.

11. A renewed base for a column including upright structural steel members, comprising a filler plate inserted between the column and the foundation, said filler plate comprising a central section inserted between the anchor bolts and side sections inserted laterally toward the central section having notches in their inner edges to receive the anchor bolts, and said sections being welded to each other and to the column.

12. A renewed base for a column including upright structural steel members, comprising a base plate under the upright members, upright plates welded at their edges to the upright members and the base plate, and a filler plate under the base plate comprising a central section adapted to be inserted between the anchor bolts, and edge sections insertable laterally toward the central section and provided with notches in their inner edges for the anchor bolts, said sections of the filler plate being welded to each other and to the base plate to provide a unitary structure.

13. The method of renewing bases of structural steel supporting columns including upright members which comprises supporting the supported structure at the finished level and maintaining it at this level, removing the deteriorated lower portion of the column, inserting a base plate under the column, Welding upright shear plates to the upright memhers and the base plate, inserting a filler plate under the base plate and between it and the foundation comprising a central section inserted between the anchor bolts, inserting notches in their inner edges for the anchor bolts laterally toward the central section, and welding the sections to each other and to the base plate.

14. A base structure for a column including upright structural members and upright connecting plates connecting said members, comprising a base plate under said members, extension plates welded at their end edges to the lower ends of the connecting plates and also to the upright members, upright shear plates welded at their upright edges to the uprights and the extension plates and angle 65 members extending horizontally between the shear plates welded at their ends to these plates, at their upper edges to the extension plates and at their lower edges to the base plate.

In testimony whereof I ailix my signature.

ARTHUR G. LEAKE.

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