US 3593477 A
Description (OCR text may contain errors)
United States Patent Inventor Martin H. Briggs London, England Appl. No. 791,699 Filed Jan. 16, 1969 Patented July 20, 1971 Assignee Sanders and Forster, Limited London, England Priority Jan. 23, 1968 Great Britain 3566/68 REINFORCED CONCRETE COLUMNS 0R BEAMS 5 Claims, 22 Drawing Figs.
US. Cl 52/253, 52/283, 52/295, 52/723 Int. Cl E04b l/4l, E04c 3/20, 1504c 3/34 Field of Search 52/283,
 References Cited UNITED STATES PATENTS 783,539 2/1905 Perrot 52/707 827,613 7/1906 Brown 52/707 1,037,416 9/1912 Beverstock 52/283 1,086,866 2/1914 Snyder 52/260 1,380,324 5/1921 Piggins 52/283 1,472,600 10/1923 Lally 52/283 2,724,261 ll/l955 Rensaa.. 52/283 X 3,261,135 7/1966 Knabe 52/283 X Primary Examiner-Pricc C. Faw, Jr. Attorney-Wenderoth, Lind and Ponack ABSTRACT: This application discloses a reinforced concrete beam or column having side attachment means for a further beam or column and comprising an anchor member which is short relative to the beam or column, which is embedded in the concrete and which has at least one plane surface in the plane of a sideface of the beam or column and having bolt holes for fixing bolts for the further beam or column.
PATENTEU JUL20 l9?! SHEET 1 BF 2 MARTIN HUNTER BRIGGS, Inventor Attorneys PATENTED JULZO I971 SHEET 2 OF 2 MARTIN HUNTER BRIGGS, Inventor Y MJMJLWMM Attorneys REINFORCED CONCRETE COLUMNS OR BEAMS The invention relates to reinforced concrete columns or beams and to building frames or other structures in which such columns or beams are employed.
An economical form of building frame is one in which the columns are of reinforced concrete and the beams are either of steel or of composite steel and concrete (e.g. steel beams in combination with concrete floor slabs). In such frames, problems arise in attaching the steel beams to the concrete columns and one object of the present invention is to provide concrete columns having improved means of attachment for steel members. The invention is not however limited in its scope to columns for use in such frames but includes the provision of the improved attachment means in columns and beams for other purposes. The invention also provides a method of making reinforced concrete columns or beams with improved attachment means.
The invention provides a reinforced concrete beam or column having side attachment means for a further beam or column or other member and comprising an anchor member which is short relative to the beam or column, is held against movement lengthwise of the beam or column and which has at least one flange or other plane surface exposed at a side face of the beam or column and having bolt holes for fixing bolts for the other member or other means of attachment for the other member.
More specifically the invention provides a reinforced concrete beam or column having side attachment means for a further beam or column or other member and comprising an anchor member which is short relative to the beam or column which is embedded in the concrete and which has at least one flange or other plane surface in the plane of a side face of the beam or column and having bolt holes for fixing bolts for the other member.
In preferred forms of the invention nuts are cast in the concrete behind the bolt holes for engagement by the fixing bolts.
joist but it may be of channel, angle, tube or plate form.
When the anchor member is of channel or I-section joist, the two flanges of the member may, if desired, lie in the planes of opposite side faces of the beam or column and have fixing bolt holes.
In some embodiments of the invention for use where it may be desired to attach members to faces of the column or beam at a right angle (or other angle), there is a steel T-member embedded in the concrete, the leg of the T being secured to the web of the I-member (or channel) and the flange or crossbar of the T being in the plane ofa face of the beam or column and having fixing bolt holes. There may be two such T-member secured to opposite sides of the web and having their flanges inthe planes of opposed side faces of the beam or column.
Axially extending bolts may be secured to the web of the I- member or to the legs of the T-members and project from the end of the beam or column to serve as means for splicing the beam or column to a further beam, column, base or capping member.
The invention also provides a method of making a beam or column as above described in which a short length of I-section rolled steel joist channel section or other anchor member, with holes for fixing bolts in a face or flange or flanges thereof, is placed in a mould for the beam or column with at least one face or flange against a side or the bottom of the mould and is attached to the mould side and/or the bottom of the mould by bolts passing through bolt holes in the said face or flange and concrete is cast into the mold around the anchor member and to form the beam or column. Preferably the bolts engage in nut behind the flange, whereby the nuts are embedded in the concrete and remain when the bolts are removed and the beam or column is extracted from mold.
Some specific embodiments and uses of columns according to the invention and a method of making them, will now be described byway of example, with reference to the accompanying drawings in which:
FIGS. 1 to 5 are plan views of five different arrangements of anchor members cast into concrete columns,
FIGS. 6 and 7 are, respectively, front and side elevations of the column shown in FIG. 5,
FIGS. 8, 9 and 10 are views, corresponding to FIGS.3, 4 and 5 of an alternative form of anchor member construction,
FIGS. 11 and 12 are, respectively, front and side elevations ofthe column shown in FIG. 9,
FIGS. I3, 14 and I5 are views corresponding to FIGS. 1, 2, 3, of another form of anchor member construction,
FIG. 16 is a front elevation of the column shown in FIG. 14,
FIGS. 17 and 18 are views, corresponding to FIGS. 1 and 3 of another form of column,
FIG. 19 is a detailed perspective view of an application of the arrangement shown in FIG. 5,
FIG. 20 is a detailed perspective view of another application ofthc arrangement shown in FIG. 5,
FIG. ZI shows an arrangement for fixing a base ofa column, and
FIG. 22 is an end view illustrating the method of casting a column incorporating the anchor member shown in FIG. 5.
Referring first to FIGS. I to 7, these Figures show various forms of anchor member attachment means cast into a reinforced concrete column. In each case these means comprise a short length of l-section steel joist, the length being just sufficient to correspond with the depth of the attachment means of a beam (e.g. of steel) to be connected to the column and, usually, not more than about one-sixth of the length of the column. In FIG. 1, only one flange of the joist is exposed at a The anchor member is, preferably, a length of I-section steel surface of the column, for attachment of a single beam. In FIG. 2 both flanges are exposed for attachment of two beams in alignment. In FIGS. 3 to 7, short lengths 31 of T-section are welded to the web of the joint, the crossmembers of the T-sections being exposed at a surface or surfaces of the column for attachment of a beam or beams. The arrangement in FIG. 3 is for attachment of two beams at right angles. That in FIG. 4 for attachment of three beams in T configuration and that in FIGS. 5 to 7 for attachment of four beams. Holes, (e.g. 32) are provided in the exposed flanges for attachment bolts and nuts are cast into the concrete behind the holes.
In FIGS. 8 to 12, the T-members 31 are replaced by short channel members 34 welded by the edges of their flanges to the edges of the l-section 30. Webs 35 may be welded between the channels and the I-section but are not essential for light constructions.
In each of the constructions shown in FIGS. 13 to 16, the I- section member is replaced by a central tube or rod 36 to which are welded T-members 37, similar to the members 31. Threeand four-way connections equivalent to FIGS. 4 and 5 may also be constructed.
In the construction shown in FIGS. 17 and 18, there is a short length of square section tube 40, or two such lengths spaced apart along the column, and the column is cast into the tubes. The tubes have bolt holes, equivalent to holes 32, and nuts 41 are cast into the concrete behind the tubes for beam attachment bolts 42. FIGS. 17 and 18 show, respectively, attachments for a single beam and for two beams but, of course there may be arrangements equivalent to any of FIGS. 1 to 5.
FIG. 19 shows the attachment of four floor beams 64 to an insert 65 at the top of a column 66, the insert being as shown in FIG. 5. The beams have plates 67 welded to their ends and strengthening fillets 68. Bolts 69 engaging in nuts 70 embedded in the concrete are used to connect the beams to the insert. The beams are cut to design lengths which leave small gaps between the plates 67 and the insert. These gaps are filled by shims or distance pieces 72. Welded to the top of the web 74 of the insert I-section there are two studs 75 which are used to secure the baseplate 76 of an upper column 77 to the top of column 66.
The construction shown in FIG. 20 is basically similar to that of FIG. 19 but is designed for heavier loads. In this construction the plates 67 are omitted and replaced by angle cleats 80, 8] which are used to attach the beams to the insert 65 during erection. After attachment in this may the beams are welded, as seen at 83, to the insert whereupon the cleats 80, 81 may be removed, if desired. in addition the insert is strengthened by fillets 84 between the flanges and webs and/or fillets 85 between the webs of the insert. In addition to strengthening the insert itself, these fillets also provide additional bearing area on the concrete for transmitting the endwise loads thereto.
In FIG. 21 there is shown an attachment for the base of a column 100 to a support surface 101. The column has an insert 102 according to FIG. 2 to which are attached brackets 103 anchored by bolts 104 to the surface 101. At the foot of the column there is a bearing plate 105 (similar to the plate 76 in FIG. 19), to which short reinforcing rods 106 are welded.
The method of casting the column with the attachment means embedded therein is illustrated by the example shown in FIG. 22. A cruciform attachment means according to FIG. is placed in a trough mould 130 and secured by bolts 131 passing through the sides and bottoms of the mould and the holes 32. The bolts engage in square or hexagonal nuts 132 behind the flanges of the joist and T-pieces. Bolts and nuts 133, 134 are alsoprovided in the top flange 135. if desired the bolts may be provided with unthreaded portions of their shanks which fit closely within the holes 32 and so accurately align the nuts I32, 134 with the holes 32. The ends of the bolts are taped or greased to assist in easy withdrawal from the concrete. After reinforcement has been placed in the mould in the usual way, the concrete is cast, and, when set, the mould sides and the bolts 131, 133 are removed leaving the nuts embedded in the concrete for engagement by the fixing bolts used to secure a beam to the column.
l. A reinforced concrete column having side attachment means for a steel beam and comprising a steel anchor member which is short relative to the column and which is embedded in the concrete, and further comprising an elongated member extending lengthwise of said column, and at least two T-members having legs secured to said elongated member and the crossbars of said T-members being in the plane ofa side face of said column and exposed thereat, and said crossbars having fixing bolt holes therein, which constitute means for attachment by means of bolts of the steel beam.
2. A column as claimed in claim 1 wherein said anchor member comprises at least two further T-members having legs secured to said elongated member and having crossbars in the plane of a second side face of said column, said last named crossbars having fixing bolt holes therein.
3. In a building frame, a reinforced concrete column having embedded in the concrete a metal anchor member which is short in relation to the column, said member having at least two plane surfaces in the planes of two differently orientated side faces of said column, said two plane surfaces being interconnected by, and secured to, at least one web embedded within the concrete with its plane extending lengthwise of the column, said plane surfaces being provided with bolt holes, and at least two steel beams bolted to said two plane surfaces respectively by bolts engaging in said bolt holes.
4. A building frame as claimed in claim 3 in which said anchor member comprises a short length of l-section steel joist, the flanges of the joist lying in the planes of a pair of op posed side faces of said column and providing the plane surfaces aforesaid and the web of the l-section being embedded in the column.
5. A building frame as claimed in claim 4 in which there is at least one T-member embedded in the concrete, the leg of the T member constituting a connecting web and being secured to the web of the l-section and the crossbar of the T member lying in the plane ofa third side face of the column and having fixing holes, a further steel beam being bolted to said fixing holes.