US2414738A - Precast concrete corrugated connection - Google Patents

Description

Jan. 2l, 1947.

A. HENDERSON PRECAST CONCRETE CORRUGATED CONNECTION 4 Sheets-Sheet 1 INVENTOR 4/e//7e/70e/"so/7 da .m 2 .ad 1.. Jv U.. .j 09... m

Jau. 2l, 1947. A. HeNnsRsoN i 2,414,738

PRECAST CONCRETE CORRUGATED CONNECTION Filed my 12, 1945 4 shutssunt 2 47 4645.394647 Ei 6 5l g INVINTQR I 3P Fig 7 E99 m- Y Hi l 4 9 l Hl g Jan. 21, 1947. A. HENDERSON PRECAST CONCRETE CORRUGATED CONNECTION Filed lay 12, 1945 4 sheets-sheet s INVENTOR l Heade/:0n

o 5 a o. 8 7 7 m Jan. 21, 1947. i

A. HENDERscN 2,414,738 V PRECAST CONCRETE CORRUGATED CONNECTION Filcd lay 12, 1945 4 Shoots-Shut 4 M34 mi teriit with each Patented Jan. 2l, 1947 CONCRETE ocmlwoa'rnp CONNECTION Edgewood, Pa., m P. Witherow,

Application May 12,1945,

.comme `(Crum-o).

PRECAsT Albert Henderson,

Willia l invention relates to building construction and, in particular, to connections whereby precast concrete members may be assembled in the course of erecting a building.

The use of precast to be connected having similar corrugated surfaces. The corrugations on the adjacent surfaces may actually mesh or iny other or may be spaced apart with a 'grout lling in the intervening space. Where the corrugations mesh with each other. a thin layer of grout is preferably disposed thereon cover adapted to be disposed over a nut after it has beenturne'd down on a bolt.

Precast corrugated connections, according to my invention may\take a variey of forms, some of which are illustrated in t e accompanying drawings and will be described in detail lierelnafter. In the drawings,

Figure 1 is a partial plan view of a girder having supporting brackets attached thereto adapted to receive the ends of beams Figure 2 is a section taken along the plane of line II-II of Figure 1;\Y

Figure 3 is a ing surfaces of adjacent members spaced slightly providea connection therebetween; Figure 4 is a diagram illustrating the dimensioning of the corrugations;

Figure 5 is a view similar to Figure 3 showing a reinforced corrugation; l Figure 6 is a partial section through a precast concrete member and a support therefor showing a corrugated connection therebetween;

Figure 7 is a view similar to Figure 1 showing a modified construction;

Figure 8 is a section taken along the plane or line VIII-VIII o! Figure 7 p asslgnor to 1 Pittsburgh, Pa.

serial No. 759313751. n l.

Figure 9 is 4a'pa'i'tial side elevation of a supporting bracket used in the construction illustrated in Figures 7 and;

Figureiio is a partialelevation showing a modiied form of connection between a column and girder;

concretenut cover;

Figure 11 is an axial section through a'precast Figure 12 is a similar view showing a nut embedded in a precast cover: n Figure 13 is a similar view showing a protective cap cast on the head of a bolt;

elevation a sleeve similar members end-to-end: f l i l Figure 17 is a section taken along the plany of line XVII-XVII oi' Figure 16;-

Figure 18 is a form of connection between members disposed end-to-end:

Figure 19 is a transverse brackets adapted to receive the ends of adjacent members; V

Figure 22 is an elevation showing a diierent form oi l `umn or smaller sectional area and Pipe lengths I4 and I 5 are embedded 1n the girder and brackets tofaccomodate the bolt. Instead ot partial plan view of a modified section taken along vthe plane oi line XIX-XIX Il. Precast brackets l2 are secured to the girder by 3 through bolt I3 I may use two separate bolts and embed nuts in the girder I to receive them. These nuts should be threaded on suitable anchor rods embedded in the girder. The sides of the girder are corrugated as at I6 and the contacting faces of the brackets have corrugations I1 meshing therewith. A thin layer of grout is applied between the contacting surfaces of the girder and brackets.

The brackets have pockets I8 formed therein adapted to accommodate the ends of beams, such as that indicated at II. The inner surfaces of the sides and end of the pockets are corrugated and the end portions of the bea-ms I I are similarly corrugated on both the sides and extreme end thereof. The maximum width of the beam II, i. e., the width from crest to crest of the corrugations, is less than the minimum width of the pocket I8, i. e., from crest to crest of the corrugations, so .that the end ofA the beam may be moved longitudinally into the pocket. It may also, of course, beset therein from above. event, the corrugations of 'the two members do not mesh but are 'spaced apart. The space I9 between the beam and the bracket is filled with grout. When the grout has set, the corrugations in the sides of the pockets and on the sides of the beam prevent the beam from pulling outn of the bracket. The corrugations on the inner end of the pocket and on the extreme end ofthe beam, being locked against relative vertical movement by the grout, transmit shear from the beam to the bracket. A similar transmission from the bracket to the girder is eiected by the meshing corrugations on the contacting surfaces .31. The member 35 may 4sions 'of the member 4 I thereof. The at bars 3I and 32 may be welded to round spacer bars 33 and 34 embedded in the members. Since the edges of the bars 3l and 32 are exposed at the crests of the corrugations, the roots are flat to conform therewith. i

Figure 6 shows a member 35 having a pocket 36 therein adapt/,ed to receive the end of a member be a column base and the member 31 a column. The sides of the pocket 36 are-,corrugated and also the sides of lthe member 31 to the depth of the pocket. The dimen- 31 are related to those of the pocket 36 in the same manner as those of the end of the beaml II to the pocket I8 in bracket I2. Thus the end of the member 31 may be set inthe pocket 36 and the space 38 .therebetween lled with grout. This provides a permanent connection between the members capable of transmitting shear stress almost to .the full strength theref. The girder and brackets have reinforcing members embedded therein as indicated at 20 and 2l. The beam II may be similarly reinforced.

Figure 3 shows corrugated surfaces of members 22 and 23 to be connected, the corrugated surfaces being provided withY metallic armor in the form of plates 24 and 25 having tongues 24a and 25a. struck up therefrom and'embedded in the members 22 and 23. In addition, double nuts 26 welded to the upper and lower ends of the armor 24 have anchor bolts 21 threaded therein and embedded in the member 22. Holes 28 in the upper and lower ends of armor 25 permit the member `23, which may be a beam, to be secured to the member 22, which may be a column, by suitable screws. The armored type of connection shown in Figure 3 makes grout unnecsssary 'and exhibits a very high efliciency in transmitting shear load.

Figure 4 illustrates the corrugations in the surfaces of the various members to enlarged scale.

These corrugations are preferably so proportionedthat the pitch p depth d. In other words, the sloping faces of the corrugations make 45 angles with the surfaces of the members in which they are formed.

The relation of the pitch and depth may be expressedV mathematically as p=2d. The pitch is preferably 1" and the depth lle" so that members of standard dimensions, such as 8" x 8", 8" x 10", 12" x 12", 12" x 14, etc., will have is equal to twice thev an even number of corrugations across their verl. tical or horizontal faces.

Figure 5 shows reinforced corrugations formed in members 29 and 30 adapted to be connected, e. g.,1a column and beam, respectively. As illustrated, the member 29 has spaced flat bars 3| and the member 30 similar bars 32 embedded therein with their edges centered on the crests of the corrugations and projecting to the extremity lare engaged with sides of the member 31 and all four sides of the pocket36 have corrugations formed therein.

Figures 'l and 8 illustrate a modied form of connection comprising a saddle bracket 39 adapted to be placed on a girder 4I! for supporting beams 4I thereon. The bracket is generally yoke shaped and has reinforcing rods 42 embedded therein. \The sides of the girder are corrugated at 43 and the ninner surfaces of .the depending sides of the bracket are similarly .corrugated as at 44, the space between the corrugations being filled with grout. Positioning pins 45 are embedded in the girder and project upwardly therefrom. The bracket has pipe lengths 46 embedded therein and welded to the reinforcing bars 42 for accommodating the pins 45. Vertical keying grooves 41 are filled with grout to prevent shifting ofthe bracket.

The bracket has shelves formed therein adapted to receive the ends of beams 4I. Securing pins 50 disposed in slots 5I in the ends of beams 4I and in recesses 52 in the sides of the pockets tie the beams to the bracket. In the case of ing to one-half 48 with pockets 49 the bracket 39 may be employed.

tion between a support, such H-section, for example, and a beam 54 of similar section. The column flange and the end of the beam have interfitting'corrugations 55 and 56. These corrugations have one sloping side and one horizontal side. Anchor beam extend through holes in the column flange and are secured thereto by nuts. The corrugations 55 and 56, like those previously described, are 1" wide and 1/2 deep. The corrugated surfaces are preferably grouted before the connection is made. It will be apparent that the connection shown in Figure 10 does not require a supporting shelf or bracket.

Figure 11 shows a precast reinforced nut cover 58 having a threaded socket 59 therein to accommodate the end of a.' bolt. The cover 58 ls preferably placed on a nut after the latter has been turned down and .the threads of the pocket 59 the threaded end of thebolt protruding beyond the nut. The cavity 60 in the cover is cylindrical and of such size as to permit the cap to turn on the nut.

' Figure 12 shows a nut 6I having a .cover 62 cast thereon. The nut is preferably welded to a reinforcing member 63 having wings 63a extending outwardly therefrom and embedded in the concrete forming the cover. This type of nut may be end girders, brackets correspondbolts 51 embedded in the cast on the head thereof.

.the members 8| turned down on a bolt by a suitable wrench applied to the exterior of the cover.

Figure 13 shows a bolt 64 having a cover 65 A reinforcing member 6B similar .to that shown at 63 is` welded to the lower face of the head.

The nut covers shown in-Figures 11 and 12 and `the bolt-head cover of Figure 13 make the connections requiring bolts and nuts weatherproof and fireproof. Figures 14 and 15 illustrate abracket composed of two similar members 61 adapted to engage a ange of an H-shaped member 68 such as a colthe column. Anchor bolts 10 ,p extend upwardly above the. `top face of theb ackets and are adapted to enter holes in a beam` o girder placed thereon. The bracket members a e gether. They are also groute .to the column as shown at '|I. The flanges from the column. o

Figures 16 and 17 illustrate a one-piece connecting sleeve 15 adapted to connect two mem,u bers 16 and 11 cast and reinforced.

bled, as illustrated, the intervening space with grout as indicated at 80.

Figures 18 and 19 show amodied connection between members 8| and 82 disposed end-to-end. -83 are disposed on opposite sides of the members 8| and 82 yand secured thereto lby through bolts 84;y Pipe lengths 84a have anchor bars 84e welded thereto and embedded in the members. Links 84d embedded in the splice plates provide connections between the bolts through adjacent members, The links extend around the pipe lengths 84h. The heads of making the joint reproof and corrosionproof. lThe contacting surfaces of the plates 83 and The aggregate section of reinforcing rods in the splice plates is equal to that in either one of and 82. The connection between the latter thus has practically the full strength of either member.

Figure 20 illustrates a precast connecting sleeve 81 adapted to unite precast members 88 and 89 of different cross sectional'areas. -The sleeve 81 adapted to receive end-to-end. The sleeve 15 is prey formed bracket |0| is attached l threaded on an anchor the bracket as at mu. The' the beam 01 have corrugations meshing with before they are put together.

p On the other side of the beam, a separately thereto by bolts faces of the adjacent flanges of as -at |03 and the |02. 'I'he outer the member 96 grout being applied therebetween.' The bracket |0I has a double nut |05 embedded therein. 'The nut is bolt to receive a bolt inserted resting on therbracket for As shown, the bracket |0|.

securing it thereto. corrugations |03 extendabove the ing borne by the brackets. In the case of the bracket 98, corrugatlons onthe upper face thereof prevent the beam frompulling' away from theV column. y; I ,l f Figurev 22 shows a furthermodliledfform of,V bracket |01 secured to a support such asian lH shaped column |08 by bolts the bracket and column have meshing corrugations The bracket |01 has a socket ||2 formed therein adapted to receive the end of a beam ||3 which shape in section. The walls of the socket H2 and the end of the beam H3 have meshing corrugations IM.

as a beam ||1. In the embodiment illustrated, the column and beam are of H-shape in section. The beam is secured to the column by bolts and threaded into beam as illustrated tacting surfaces of at 26 in Figure 3. The conthe beam and column have |20 formed therein. Athin |09 inserted through l holes in the flanges of the latter. The boltsarel` insana is adapted througha hole in a beam The beam supported on the bracket isillustrated as lof H-` inner surfaces of the walls least a portion of the load on the column,

' .and `moving position. The inside dimensions of the collar are are adapted to accommodate a column v Figure 25 the column may have corrugations |2| to receive a beam extending at\right angles to the beam ||1. On the other side of the beam reinforced bracket |22 is secured similar to the bolts ||8. of the bracket and column gations |24 to which a thin film of grout is applied before the bracket is'secured in place. -The bracket has upper and vlower shelves |22a and |22b. Bolts |25'extend through the latter and through holes in the flanges of amember |25, such as a beam of H-shape in section. The end of the beam is received between the shelves of the bracket, a thin layer ofgrout |21 being ap.-l plied therebetween. A

Figure 24 illustrates severalfforms ofv .connections'adapted particularly for precast columns. A precast column base |28 is secured to a eldcast footer |29 by bolts |30 which may either be anchor bolts embedded inthe footer or separate bolts threaded into double nuts, such as shown at 26 and ||0, embedded therein. The base |28 has spaced upstanding walls |3| adapted to receive the lower end of a column |32 therebetween. The column is illustrated as of H-shape in section. The outer 'surfaces of the column flanges and the i6, a precast The contacting surfaces meshing corrugations |33 formed'therein.` v'l'.'he column and base are assembled inthe-same manneras thebeam' |.|3'and braok`et |01, i. e., by

relative lateral'movementy-after the corrugations havebenprgperly'lined up. A thin film of grout isapp-liedover the contacting surfaces. A layer of grout |34 is applied between the bottom of the the base at the remainder being transmitted through the corrugations |33.

A collar bracket at an appropriate tal members suchasgirdersor beams. The bracket is -precastandreinforced. It is applied by' placing it-over the upper end of the column it vertically therealong into proper column and the base to transmit to suflicient to permit free movement thereof on the column. Meshing corrugations |36 are formed on one interior face of the collar and on one side of the column at the height at which the collar is to be fixed. When the collar has been placed at the proper height, it is moved laterally to cause meshing engagement ofthe corrugations. Thereafter, the clearance space between the bracket and column is filled with grout as at |31. The bracket |35 has upper and lower shelves |35a'and |35b similar to those of bracket |22.

A c p |38 is disposed on top of the column |32. It is 'similar to the base |3| and has grout applied between its corrugations |39 meshing with those formed at the upper end ofthe column. A layer of grout column before the cap is placed.

A base |4| is placed on the cap |38 with a layer of grout |42 therebetween and secured thereon by bolts |43 inserted through alined holes in the cap and base. The base |4| is similar v to thatshown at |3| except that its |45 somewhat smaller than the column |32. The base |44 and the column |45 are united in the same manner as the base |28 and column |32 by meshing corrugations withgrout applied as previously explained.

illustrates a precast reinforced conby bolts |23 |35 is disposed on the column... height for supporting horizony |40 is applied to the top of the have meshing corru- `walls. The column crete bracket |46 mounted von a column |41. The bracket has corrugations |48 on opposite interior has corrugations |49 on the outer faces of its'flanges. -When the bracket has been .positioned as illustrated, the space between itand the column is filled with grout as at |50. The inside dimensions of the collar are such as to permit free movement thereof along the column. Thev bracket has upper and lower shelves |4611. and |461) on opposite sides thereof adapted to receive the ends of beams such as that shown at |5I. .Bolts |52 inserted through holes in the bracket shelves and beam flanges secure the beam to the bracket. The beam and column as illustrated are of H-shape in section. The bolts may have protective covers on the heads thereof as illustrated in Figure 13.

It will be apparent that my invention provides a novel set of connections adapted for uniting various types of precast concrete structural members useful in the construction of buildings. The principal advantage of the several forms of connection is that they all have the ability to transmit shear load with a high degree of eiliciency. This load is transmitted, furthermore, through' the adjacent surfaces of the several members and not through the tie means where such are employed. The formation of corrugated surfaces on the various members is a simple matter, involving only thefuse of molds or cores having appropriately shaped-surfaces. The precast-nut and bolt covers afford protection for the tie means against corrosion and fire,

Although I have illustrated several forms of connection embodying my invention, it lwill be understood that changes in the details thereof as illustrated may be made without departing from the spirit of the invention or the scope of the appended claims.

I claim:

1. A structural connection comprising a precast concrete support member, a second precast concrete member supported thereon, said support member having corrugations formed in a lateral face thereof, and said second member having corrugations formed in the place thereof adjacent the corrugated face of the support member,

the corrugations of the second member meshing l i crete bracket member secured to said support side walls |44 member, said bracket member having a pocket' therein, said pocket having substantially verticalspaced side walls and an end wall, and corrugations formed in vsaid spaced side walls and said end wall, the corrugations in the end wall being transverse to the corrugations in said spaced side walls.

4. A structural connection as defined by claim 3 characterized by corrugationsrformed in a face of said support member and-corrugations formed in a face of said bracket member meshing with said first-mentioned corrugations.

5. A structural connection as dened by claim 3 characterized by a beam member having one end surfaces meshing with 'the corrugations'of said disposed in said pocket, the end portion of said support membena beam member resting` on' said beam member resting in said pocket having corbracket, and a tie securing fsaid rbea-mv on said rugations formed on the vertical sides thereof bracket. l

ber having one end supported on said bracket, 10 substantially horizontal jcorug'ations formed in substantially horizontal corrugations formed in collar member. the support member above the bracket, and co l5 9. A structural connection comprising a pre rugations meshing therewith formed in the end cast concrete support member, a precast-concrete of said beam.

7. A structural connection comprising a, premember, said support member having substancast concrete support member, a precast con 4 tially horizontal corrugations formed on opposite crete bracket member thereon, said support 20 faces thereof andcorrugations formed in the member having substantially horizontal corruinner faces of said saddle bracket coasting with. gations formed in a surface thereof, said bracket said corrugations in said support member.

HENDERSON.

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