Concrete Weldment

Abstract

A weldment that is embedded in a precast concrete building member that is used to join the concrete building member to other concrete building members. The weldment has a top plate, side plate, and outstanding top and bottom legs. The surface of the top plate and side plate are not embedded in the precast concrete building member. The legs are integrally formed with the top plate and side plate. The top plate and side plate present weldable surfaces to join by welding the precast concrete building member to another building member.

Claims

1. A combination concrete weldment and precast concrete member comprising: a precast concrete member having a length, a width and a height, a top and bottom surface, an edge surrounding the perimeter of the concrete member, a concrete weldment comprising a top plate having a front edge and rear edge, a side plate having top edge and a bottom edge, the front edge of the top plate connected to the top edge of the side plate, the top plate and side plate connected at substantially 90° to each other, a first leg having a proximal end and a distal end, the proximal end connected to the bottom edge of the side plate with the first leg, embedded in the precast concrete member, a second leg having a proximal end and a distal end, the proximal end connected to the rear edge of the top plate with the second leg embedded in the precast concrete member, the top plate having an exposed top surface along the top surface of the concrete member and which is not embedded in the concrete member and presents a weldable surface, and the side plate having an exposed surface along the edge that is not embedded in the concrete member and presents a weldable surface.

2. The combination concrete weldment and precast concrete member of claim 1 and further comprising a saw tooth cut into the first and second legs to increase the holding force of the weldment within the precast concrete member.

3. The combination concrete weldment and precast concrete member of claim 2 and further comprising a tab bent at substantially 90° the distal ends of the first and second legs.

4. The combination concrete weldment and precast concrete member of claim 3 wherein the top leg, bottom leg, top plate, side plate, first leg, second leg, and tabs are all integrally formed from a single piece of metal.

5. The combination concrete weldment and precast concrete member of claim 4 wherein the top leg is bent at substantially a 30° angle from rear edge of the top surface.

6. The combination concrete weldment and precast concrete member of claim 5 wherein the bottom leg is bent at substantially 60° from the bottom edge of the side plate.

7. A method of connecting a precast concrete member having a weldment embedded therein to a second member that has a weldable surface comprising the steps of: (a) forming a precast concrete member with a concrete weldment embedded therein, the concrete weldment comprising a top plate having a front edge and rear edge, a side plate having a top edge and a bottom edge, the front edge of the top plate connected to the top edge the side plate, the top plate and side plate connected at substantially 90° to each other, a first leg having a proximal end and a distal end, the proximal end connected to the bottom edge of the side plate with the first leg embedded in the precast concrete member, a second leg having, a proximal end and a distal end, the proximal end connected to the rear edge of the top plate with the second leg embedded in the precast concrete member; the top plate and side plate having an exposed front surface that is not embedded in the concrete member, and if the precast concrete member is horizontally disposed and the second member is a precast concrete vertical beam, then: (b) forming the precast concrete vertical beam with a second concrete weldment embedded therein, the second concrete weldment comprising a top plate having a front edge and rear edge, a side plate having a top edge and a bottom edge, the front edge of the top plate connected to the top edge the side plate, the top plate and side plate connected at substantially 90° to each other, a first leg having a proximal end and a distal end, the proximal end connected to the bottom edge of the side plate with the first leg embedded in the precast concrete member, a second leg having a proximal end and a distal end, the proximal end connected to the rear edge of the top plate with the second leg embedded in the precast concrete member; the top plate and side plate having an exposed front surface that is not embedded in the concrete member, (c) orienting the second concrete member in close proximity to the precast concrete member so that the exposed front surface of the top plate of one of the concrete members is in close proximity to the side plate of the other concrete member, (d) welding a weld plate to the front surface of either the top plate or side plate of one of the concrete members, and (e) welding the weld plate to the top plate or side plate of the second concrete member; if the precast concrete member is horizontally disposed and the second member is a precast concrete vertical column or wall with an embedded plate with a weldable exposed front surface, then: (f) orienting the precast concrete member in close proximity to the precast concrete vertical column so that the exposed front surface of the top plate or the exposed front surface of the side is in close proximity to the embedded plate of the precast concrete vertical wall or column, (g) welding a weld plate to the front surface of either the top plate or side plate of the precast concrete member, and (h) welding the weld plate to the embedded plate of the precast vertical column or wall.

8. A method of connecting a precast concrete wall panel having a weldment embedded therein to a second footing member that has a weldable surface comprising the steps of: (a) forming a precast concrete wall panel with a concrete weldment embedded therein, the concrete weldment comprising a top plate having a front edge and rear edge, a side plate having a top edge and a bottom edge, the front edge of the top plate connected to the top edge the side plate, the top plate and side plate connected at substantially 90° to each other, a first leg having a proximal end and a distal end, the proximal end connected to the bottom edge of the side plate with the first leg embedded in the precast concrete wall panel, a second leg having a proximal end and a distal end, the proximal end connected to the rear edge of the top plate with the second leg embedded in the precast concrete wall panel; the top plate and side plate having an exposed front surface that is not embedded in the precast concrete wall panel; (b) forming a cast in place floor with a footing plate embedded therein; (c) placing the precast concrete wall panel on supporting members above the cast in place floor with the front surface of the side plate in close proximity the footing plate, (d) welding the front surface of the top plate to the footing plate.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0021] FIG. 1 is a perspective view of the first embodiment of the weldment.

[0022] FIG. 2 is a perspective view of the second embodiment of the weldment.

[0023] FIG. 3 is a front elevation view of the first embodiment of the weldment.

[0024] FIG. 4 is a front elevation view of the second embodiment of the weldment.

[0025] FIG. 5 is a right side elevation view of the first and second embodiments of the weldment.

[0026] FIG. 6 is top plan view of the first embodiment of the weldment.

[0027] FIG. 7 is top plan view of the second embodiment of the weldment.

[0028] FIG. 8 is a cross section view with portions removed of a floor or roof member connected to a supporting beam illustrating the position of the weldments in each member with respect to each other.

[0029] FIG. 9 is a cross section view with portions removed of precast member connected to a supporting column or wall illustrating the position of the weldments in each member with respect to each other.

[0030] FIG. 10 is a cross section view with portions removed of another embodiment of a precast member connected to a supporting column or wan illustrating the position of the weldments in each member with respect to each other.

[0031] FIG. 11 is a cross section view with portions removed of a vertical wall panel connected to a cast in place footing illustrating the position of the weldment to the footing plate.

[0032] FIG. 12 is a cross section view of the mold used for forming, the concrete members with the weldment and slab reinforcement placed in the mold.

[0033] FIG. 13 illustrates the stamping process for manufacturing the metal weldment.

[0034] FIG. 14 is a top plan view of the weldment illustrated in FIG. 1 formed from the stamping process.

[0035] FIG. 15 is a top plan view of the weldment illustrated in FIG. 2 formed from the stamping process.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

[0036] Referring to FIG. 1 a first embodiment of a weldment or connector 20 is illustrated. FIG. 2 illustrates a second embodiment of a weldment 22 that functions substantially identically to the first embodiment. For simplicity where applicable, the same reference numbers will be used for common components of the weldments 20, 22. The weldments 20, 22 are manufactured form a one-piece steel plate member made of metal, such as stainless steel or carbon steel. The weldment 20, 22 includes a top plate 24 and a side plate 26 having a generally planar surface suitable for welding. The weldment 22 has a pair of legs being a top leg 28 and a bottom leg 30. The weldment 22 has two top legs 32 and two bottom legs 34. The top legs 28, 32 are bent down at an angle “A” approximately 30° from the horizontal surface of top plate 24 and the bottom legs 30, 34 are bent upward approximately 60° at an angle “B” from the vertical surface of side plate 26 (See FIG. 5). The legs 28, 30 32 and 34 all terminate in bent tips 36 that are at an angle of approximately 90° from the surface of their respective legs. The sides of the legs 28, 30, 32 and 34 are provided with a saw tooth surface 38 that is approximately one-quarter inch deep at middle of all of the legs. The bent tips 36 and saw tooth surface 38 increase the tensile capacity of the weldments 20, 22 and the holding force (the force necessary to pull the weldment out from the concrete member) of the weldments 20, 22.

[0037] The method of manufacturing the weldments 20, 22 is illustrated in FIGS. 13-15. Referring to FIG. 13, a five-inch wide steel plate 40 is machine cut or stamped to the shapes as shown. This creates two blanks 42, 44 as seen in FIGS. 14 and 15. Holes 45 are punched or drilled as shown. The blank 42 is bent along fold lines 44, 46, 48 and 50 to the shape as shown'in FIG. 1. The blank 44 is folded along fold lines 54, 56, 58 and 60 to the shape as shown in FIG. 2. The method of stamping the two different blanks 42, 44, which as can be seen are complementary to each other, is to minimize, and in this case to almost eliminate the material waste and to provide manufacturing efficiency. The only waste in this case is the removal of the holes 45. These two weldments 20 and 22 are designed such that they have the exact same strength and load bearing capacity.

[0038] As seen in FIG. 12, the weldment 20, 22 has in the side plate 26 has a hole 45, that is preferably threaded. The weldment 20, 22 is placed in the form used to manufacture the precast concrete member. The weldment 22, 24 is positioned with the side plate 26 against a side form 62 in the mold and pins or screws 64 are passed through the side form 62 and into the holes 45. This keeps the weldment 20, 22 in proper place in the mold while the concrete is poured into the mold. Wire strand or reinforcing bars 66 may be placed through the weldment 22, 24 for added strength to the finished concrete member.

[0039] Several examples of connecting the precast concrete members are illustrated in FIGS. 8-11. In FIG. 8 one weldment 20 or 22 is embedded in a precast t member 68. The side plate 26 has an exposed outside surface extending out from the edge of the precast t member 68. There is a beam 70 adjacent to the precast t member 68. At the top of the beam 70 is a weldment 20 or 22 that has the top plate 24 extending out from the top of the beam 70 such that the top surface of the top plate 24 is exposed and free of concrete. A loose weld plate 72 is welded to the side plate 26 of the weldment in the t member 68 and to the top plate 24 of the weldment in the beam 70. A backup rod 74 is inserted between the t member 68 and the beam 70 with the spacing filled in the conventional manner with calking joint 76.

[0040] FIG. 9 illustrates another embodiment in which a weldment 20 or 22 is embedded in the precast t member 68 as previously described. In this case there is column or shear wall 78 adjacent to the t member 68. There is an embedded plate 80 in the column 78. The weld plate 72 is welded to the top plate 24 of the t member 68 and is also welded to the front surface of the embedded plate 80. The backup rod 74 is inserted and the calking joint 76 completes the installation.

[0041] FIG. 10 illustrates a weldment 20 or 22 that is embedded or cast in the flange at the top of a doublet member 82. Double tee members are load bearing slabs with two depending concrete joists for flexural capacity. The double tee member 82 is formed with a reinforcing mesh positioned generally in the center of the slabs that extend generally parallel to the load bearing surface of the slab. The weld plate 72 is welded to the top plate 24. The backup rod 74 is inserted between the double t member 82 and a spandrel or wall 84 to which the double t member 82 is to be fastened. The weld plate 72 is then welded to the embedded plate 80 in the spandrel or wall 84 and the calking joint 76 is applied.

[0042] FIG. 11 illustrates another embodiment in which the weldment 20 or 22 is embedded in a precast wall panel 86. The wall panel 86 is supported on a shim stack 88. There is a footing plate 90 that is embedded in a floor or footing 92. The weldment 20 or 22 has its side plate 26 welded to the footing plate 90. The footing plate 90 can be made from a flat sheet of metal embedded in the floor or footing 92 with a vertical plate welded thereto or it can be a singular t-shaped member.

[0043] The weldments 20 and 22 provide connections in accordance with the principles of the present invention as are shown for joining, adjacent precast concrete beams, slabs and supporting column. As shown in FIGS. 8-11 the weldments are embedded or cast in the slab, beam end or wall panel so that the embedded plate or weldment of adjoining column members is placed in opposing relationship for welding of the weldments or embedded plates together to join the columns, beams and slabs.

[0044] Thus there has been provided a concrete weldment and method of manufacturing the weldment that fully satisfies the objects and advantages set forth above. While the invention has been described in conjunction with a specific embodiment, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art in light of the foregoing description. Accordingly, it is intended to embrace all such alternatives, modifications and variations as fall within the spirit and scope of the appended claims.