Field of the invention

The invention relates to a column shoe as defined in the preamble of independent claim 1.

The invention relates to column shoes which are used in lower ends of building elements of concrete, preferably precast building elements of concrete, such as in lower end corners of concrete columns or corresponding concrete element columns and/or in lower end edges of concrete columns or corresponding concrete element columns for securing the building element to bolts projecting from a base structure. A column shoe according to the invention may however also be used for securing wall elements of concrete to bolts projecting from a base structure. A column shoe according to the invention may however also be used for securing walls of concrete and beams of concrete and slabs of concrete to bolts projecting from a base structure.

Publication WO 2012/056100 presents a column shoe for securing steel concrete columns to a base. The column shoe comprises a bolt housing, which comprises a baseplate provided with a bolt hole, and a sideplate, and attachment units fixedly connected to the bolt housing for securing the column shoe and the steel concrete column together.

Objective of the invention

The object of the invention is to provide a column shoe that provides for increased column shoe and connection shear force resistance and for increased column shoe and connection tension force resistance.

Short description of the invention

The column shoe is characterized by the definitions of independent claim 1.

Preferred embodiments of the column shoe are defined in the dependent claims.

In the column shoe the bolt housing is provided with at least one socket member for attaching an additional anchoring means such as a dowel or a bar to the column shoe in addition to at least one attachment unit and in addition to an anchor bolt.

The additional anchoring means, when fastened to a column shoe, increases column shoe and connection shear force resistance and increases column shoe and connection tension force resistance.

The additional anchoring means, when fastened to a column shoe, increases the seismic resistance.

The additional anchoring means, when fastened to a column shoe, increases the pull-out capacity of the column shoe in the horizontal direction.

The additional anchoring means may be in the form of a main bond, a reinforcement bar, or a dowel bar. The additional anchoring means may be installed or attached to the bolt housing after casting of the column shoe into a building element of concrete. No modifications to the formwork for casting the concrete unit is therefore necessarily needed in order to provide a bolt housing with additional anchoring means.

The invention relates also to the use of a column shoe according to any of the claims 1 to 15 for lifting a building element of concrete having at least one column shoe according to any of the claims 1 to 15 attached to the building element of concrete by attaching a lifting member to a socket member of the column shoe attached to the building element of concrete and by lifting the building element of concrete by lifting from the lifting member.

List of figures

In the following the invention will described in more detail by referring to the figures, of which

Figure 1 shows a column shoe according to a first embodiment,

Figure 2 shows the column shoe shown in figure 1 from above,

Figure 3 shows the column shoe shown in figure 1 from one side

Figure 4 shows the column shoe shown in figure 1 in partly cut view,

Figure 5 shows a column shoe according to a second embodiment,

Figure 6 shows the column shoe shown in figure 5 from above,

Figure 7 shows the column shoe shown in figure 5 from one side

Figure 8 shows the column shoe shown in figure 5 in partly cut view,

Figure 9 shows a column shoe according to a third embodiment,

Figure 10 shows the column shoe shown in figure 9 from above,

Figure 11 shows the column shoe shown in figure 9 from one side

Figure 12 shows the column shoe shown in figure 9 in partly cut view,

Figure 13 shows a column shoe according to a fourth embodiment,

Figure 14 shows the column shoe shown in figure 13 from above,

Figure 15 shows the column shoe shown in figure 13 from one side

Figure 16 shows the column shoe shown in figure 13 in partly cut view,

Figure 17 shows a column shoe according to a fifth embodiment,

Figure 18 shows the column shoe shown in figure 17 from above,

Figure 19 shows the column shoe shown in figure 17 from one side

Figure 20 shows the column shoe shown in figure 17 in partly cut view,

Figure 21 shows a concrete column provided with four column shoes according to one embodiment,

Figure 22 shows the concrete column shown in figure 21 as seen from below,

Figure 23 shows a concrete column provided with four column shoes according to the first embodiment shown in figures 1 to 4, Figure 24 shows the concrete column shown in figure 23 as seen from below,

Figure 25 shows a concrete column provided with four column shoes according to another embodiment,

Figure 26 shows the concrete column shown in figure 25 as seen from below,

Figure 27 shows a concrete column provided with four column shoes according to yet another embodiment,

Figure 28 shows the concrete column shown in figure 27 as seen from below,

Figure 29 shows a concrete column provided with four column shoes according to the third embodiment shown in figures 9 to 12,

Figure 30 shows the concrete column shown in figure 29 as seen from below,

Figure 31 shows a concrete column provided with four column shoes according to still another embodiment,

Figure 32 shows the concrete column shown in figure 31 as seen from below,

Figure 33 shows a concrete column provided with four column shoes according to the fifth embodiment shown in figures 17 to 20,

Figure 34 shows the concrete column shown in figure 33 as seen from below,

Figure 35 shows a concrete column provided with four column shoes according to another embodiment of the column shoe, where a lifting loop is fastened to one column shoe,

Figure 36 shows a concrete column provided with four column shoes according to another embodiment of the column shoe, where a lifting device is fastened to the four column shoes,

Figure 37 shows a concrete column provided with four column shoes according to another embodiment of the column shoe where a lifting ring is fastened to one column shoe, and Figure 38 shows a concrete column attached to a base by means of column shoes.

Detailed description of the invention

Figures 1 to 20 show five different embodiments of a column shoe 1 for securing building elements of concrete such as concrete columns to a base 3 such as a foundation of a building or a corresponding load-bearing structure. The building element of concrete is preferably in the form of a precast building element of concrete such as a precast concrete column, which means that the building element of concrete is manufactured at a location different from the construction site where the building element is used in a building. The building element can also be in the form of a wall element of concrete, a precast wall element of concrete, a beam of concrete, a precast beam of concrete, a slab of concrete, or a precast slab of concrete.

Figures 21 to 34 show seven different concrete columns 2 each provided with four column shoes 1 so that each lower corner of each concrete column 2 is provided with a column shoe 1. The column shoe 1 comprises a bolt housing 4 that comprises a baseplate 5 provided with a through bolt hole 6 for an anchor bolt 7 which is partly arranged in the baseplate 5 so that the anchor bolt 7 projects from the base 3. The anchor bolt 7 may be provided with treads (not shown) for nuts (not shown) in order to secure the bolt housing 4 of the column shoe 1 to the base 3.

The bolt housing 4 comprises additionally an upper structure 8 connected to the baseplate

5.

The column shoe 1 comprises additionally at least one attachment unit 12 attached to the bolt housing 4 for securing the column shoe 1 and the concrete column 2 together. A such attachment unit 12 may be fixedly or releasable attached to the bolt housing 4.

The bolt housing 4 is provided with at least one socket member 9 for attaching an additional anchoring means 10 such as a dowel, as is shown in figures 9 to 16 and 27 to 32, or a bar, as is shown in figures 1 to 8 and 17 to 26 and 33 to 34, to the column shoe 1 in addition to at least one attachment unit 12 and in addition to an anchor bolt 7.

A purpose of the attachment unit 12 is to transfer loads between the building element of concrete, into which the column shoe is to be at least partly cast, and the base 3. Such loads may include any of the following: shear force, tension, bending, torque and pressure.

The number of socket members 9 per column shoe 1 may vary. The figures show column shoes 1 having one, two, or three socket members 9.

The column shoe 1 comprises preferably, but not necessarily, a socket member 9 comprising a hole 11 for at least partly receiving an additional anchoring means 10.

The column shoe 1 comprises, as shown in figures 1 to 16, at least one a socket member 9 comprising a hole 11 in the form of a cylindrical through hole for at least partly receiving an additional anchoring means 10.

The column shoe 1 may, as shown in figures 17 to 20, comprise at least one a socket member 9 comprising a hole 11 in the form of a cylindrical blind hole for at least partly receiving an additional anchoring means 10.

The hole 11 of the socket member 9 is provided with an inner threading 13 for cooperation with an outer threading 14 of at least one additional anchoring means 10.

The inner threading 13 extends over the whole length of the hole 11. In practice this means that if the socket member 9 comprises a hole 11 in the form of a cylindrical through hole having an inner threading 13 extending over the whole length of the cylindrical through hole, one additional anchoring means 10 can be fastened at both ends of the cylindrical through hole. For example in the embodiments shown in figures 1 to 16, two additional anchoring means 10 are attached to each socket member 9 so that one additional anchoring means 10 is attached using the inner threading 13 of the cylindrical through hole at one end of the cylindrical through hole and so that another additional anchoring means 10 is attached using the inner threading 13 of the cylindrical through hole at the opposite end of the cylindrical through hole. If the column shoe 1 comprises a socket member 9 comprising a hole 11, the hole 11 is preferably, but not necessarily, a cylindrical hole, such as a through or blind hole, having a first central axis that is parallel with a second central axis of a cylindrical through bolt hole 6 in the baseplate 5 of the bolt housing 4, provided that the through bolt hole 6 in the baseplate 5 of the bolt housing 4 is in the form of a cylindrical through bolt hole 6

Instead of or in addition to the bolt housing 4 only being provided with at least one socket member 9 for attaching an additional anchoring means 10 to the bolt housing 4, the column shoe 1 may be provided with an additional anchoring means 10. Such additional anchoring means 10 may be arranged at least partly in a socket member 9 so that the additional anchoring means 10 is fastened to the bolt housing 4 by means of a positive connection between the socket member 9 and the additional anchoring means 10. It is also possible that the column shoe 1 is provided with an additional anchoring means 10 having an outer threading 14 and that the socket member 9 comprising a hole 11 provided an inner threading 13 for cooperation with the outer threading 14 of the additional anchoring means 10, whereby the additional anchoring means 10 is arranged at least partly in the hole 11 of the socket member 9 so that the additional anchoring means 10 is fastened to the bolt housing 4 by means of the inner threading 13 in the hole 11 of the socket member 9 and the outer threading 14 of the additional anchoring means 10.

The bolt housing 4 may be a casted one-piece structure or a structure formed by welding together several sub-structures such as a baseplate 5 and an upper structure 8.

The column shoe 1 may comprise a socket member 9 that is an integrated part of at least one of the upper structure 8 of the bolt housing 4 and the baseplate 5 of the bolt housing 4. Especially if the bolt housing 4 is a casted one-piece structure it may be of an advantage to provide the bolt housing 4 with integrated casted socket members 9 in connection with the casting of the bolt housing 4.

The column shoe 1 may comprise a socket member 9 that is an external structure of the bolt housing 4 and that is fixedly of releasable attached to at least one of the upper structure 8 of the bolt housing 4 and the baseplate 5 of the bolt housing 4.

The column shoe 1 may comprise a socket member 9 that is at least partly formed in at least one of the upper structure 8 of the bolt housing 4 and the baseplate 5 of the bolt housing 4.

The column shoe 1 may comprise a socket member 9 that is formed fully within the baseplate 5 of the bolt housing 4 of the bolt housing 4 as is the case in the fifth embodiment of the column shoe 1 shown in figures 17 to 20.

The column shoe 1 may comprise a socket member 9 for attaching an additional anchoring means 10 in the form of a main bond. It is also possible that the column shoe 1 comprises a socket member 9 for attaching an additional anchoring means 10 in the form of a main bond and an additional anchoring means 10 in the form of a main bond fastened to said socket member 9 for attaching an additional anchoring means 10 in the form of a main bond.

The column shoe 1 may comprise a socket member 9 for attaching an additional anchoring means 10 in the form of a reinforcement bar. It is also possible that the column shoe 1 comprises a socket member 9 for attaching an additional anchoring means 10 in the form of a reinforcement bar and an additional anchoring means 10 in the form of a reinforcement bar fastened to said socket member 9 for attaching an additional anchoring means 10 in the form of a reinforcement bar.

The column shoe 1 may comprise a socket member 9 for attaching an additional anchoring means 10 in the form of a dowel bar. It is also possible that the column shoe 1 comprises a socket member 9 for attaching an additional anchoring means 10 in the form of a dowel bar and an additional anchoring means 10 in the form of a dowel bar fastened to said socket member 9 for attaching an additional anchoring means 10 in the form of a dowel bar.

A column shoe 1 as described here and that is fastened to a building element of concrete may be used lifting the building element of concrete by attaching a lifting member 15 to the socket member 9 of the column shoe 1 as is shown in figures 35 to 37 and by lifting the building element of concrete from the lifting member 15.

It is apparent to a person skilled in the art that as technology advances, the basic idea of the invention can be implemented in various ways. The invention and its embodiments are therefore not restricted to the above examples, but they may vary within the scope of the claims.