JPS62296035A - Column base metal fitting and apparatus for fixing the same - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] 3. Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a column base for fixing a column base when a steel column is built on a concrete foundation in a civil engineering building structure. This invention relates to hardware and its fixing device.

[Prior Art] Steel columns (hereinafter referred to as columns) in civil engineering and architectural structures are generally built on concrete foundations. In this case, the material strength of the column is more than 10 times greater than that of the concrete foundation, so in order to disperse and transmit the stress generated in the column to the concrete foundation, the wall hardware fixed to the column base is attached to the anchor bolt. It is fixed to a concrete foundation.

Various types of metal fittings for column bases have been proposed and put into practical use, but an example is the
There is an invention disclosed in Publication No. 5. As shown in FIGS. 7 and 8, this invention includes a protrusion 3 (the H-shaped one is shown in the figure) that is slightly larger than the cross-sectional shape of the pillar 6 on the upper surface of the rectangular bottom plate 2. , a pedestal 4 having a hole 5 into which an anchor bolt fits is provided on the bottom plate 2.

The above-mentioned sliding skin hardware 1 is installed in a factory or the like by attaching a pillar 6 to a protrusion 3.
After it is fixed, it is transported to the site, and the hole 5 made in the pedestal 4 is fitted into the anchor bolt planted in the concrete foundation, and it is fixed with a nut.

[Problems to be solved by the invention] As is well known, columns of civil engineering and architectural structures are subject to axial compressive force,
It produces three stresses: bending moment and shear force,
In particular, bending moment is more dominant than other stresses.

Therefore, it is necessary to attach the anchor bolt that resists the bending moment to the outside of the column base hardware 1 as much as possible, that is, at a position as far away from the protrusion 3 as possible. However, in order to mount the anchor bolt at a position far from the protrusion 3, the bottom plate 2 must be made that much larger, which not only increases the overall weight and reduces workability, but also reduces material costs. There was a problem.

In addition, the anchor bolts for fixing the column base hardware 1 are embedded in the predetermined positions in advance when pouring the concrete foundation, but for on-site work, each hole of the column base hardware 1 is It is difficult to install it in the correct position corresponding to the However, since the conventional column base hardware 1 is provided with a hole 5 having a diameter slightly larger than the diameter of the anchor bolt, there is no degree of freedom, and it may be difficult to insert the anchor bolt.

[Means for Solving the Problems] The present invention has been made to solve the above problems, and includes: a bottom plate, a protrusion provided on the upper surface of the bottom plate, and an anchor bolt provided on the bottom plate. Holes to fit into the anchor bolts are provided in proximity to the four corner ends of the bottom plate in a hardware consisting of a plurality of pedestals having holes for fitting into the anchor bolts, and
A pedestal, a part of which protrudes from the bottom plate, is provided around the hole,
and hardware for a column base, the bottom surface of the pedestal being provided above the bottom surface of the bottom plate, a bottom plate, a protrusion provided on the top surface of the bottom plate to which the column base is fixed, and an anchor bolt provided on the bottom plate. In a metal article consisting of a plurality of pedestals having holes for fitting into the anchor bolts, the holes for fitting the anchor bolts are formed close to the four corner ends of the bottom plate and considerably larger than the diameter of the anchor bolts, and the holes for fitting the anchor bolts are formed in the base plate. A metal fitting for a pillar base is provided around which a part of the pedestal protrudes from the bottom plate, and the bottom surface of the pedestal is provided above the bottom surface of the bottom plate; The present invention provides a fixing device for a column pedestal hardware, comprising a washer having a through hole provided at an eccentric position, and fixing the column pedestal hardware to an anchor bolt via the washer.

[Operations] In the first invention, the hole into which the anchor bolt fits is located away from the protruding part, and the bottom surface of the pedestal is floating from the concrete foundation, so even if a large overturning moment is applied to the column, the anchor bolt will not be removed. can withstand sufficiently, and there is no risk of stress concentration occurring on the bottom plate.

In addition, the invention of Ka 2 is one in which a hole for fitting an anchor bolt is formed in a large size, and a metal fitting for a column base is fixed via a washer having a through hole in the center or at an eccentric position. Even if the bolt positions are not accurate, the column base hardware can be firmly fixed in the correct position.

[Embodiment] FIG. 1 is a plan view of an embodiment of the first invention, and FIG. 2 is a partially sectional front view thereof. In both figures, numeral 10 is metal fittings for the column base formed by casting or forging, and the bottom plate 1
1 is provided with a convex protrusion 12 on the upper surface thereof. The outer shape of the protrusion 12 substantially matches the outer shape of the column 17 fixed thereto, and a protrusion 13 whose outer shape substantially matches the inner shape of the column 17 is provided at the upper end, and the protrusion 13 has an inclined surface. 14
It continues to the outer periphery of the protruding portion 12 through the. Also, the protrusion 1
2 is formed in a convex shape, and its lower part is made thinner than the bottom plate 11 to save weight and material.

Reference numerals 15 to 15C indicate holes into which anchor bolts are inserted, which are provided near the tips of the four corners of the bottom plate 11 away from the protrusion 12. 16 to 16C are pedestals formed concentrically with holes 15 to 5C, and in order to reinforce the periphery of holes 15 to 15C, a part of the outer periphery protrudes from the bottom plate 11 and protrudes outward; The lower surface is h (5 h in the embodiment) from the lower surface of the bottom plate 12.
mm) above.

The above-mentioned column base hardware 10 is installed in a factory or the like on a column 17.
The lower end of the pillar 17 is brought into contact with the tip of the protruding part 12, and the lower end of the column 17 and the groove formed by the inclined surface 14 are butt welded using the protruding part 13 as a backing to fix both together. The column base hardware 10 integrated with the column 17 in this manner is transported to a construction site, and each hole 15 of the column base hardware 10 is attached to an anchor bolt.
~15C are fitted and fixed on the concrete foundation.

As described above, the column base hardware 10 according to the present invention has holes 15 to 15C that fit into anchor bolts at positions apart from the protruding portion 12 so that the pedestals 16 to 16C protrude outward from the bottom plate 12. , the bottom surfaces of the pedestals 16 to 16C are connected to the bottom plate 12
Since the bottom plate 12 is located above the bottom surface of the column 17, even if the bottom plate 12 is made small, the resistance force of the anchor bolt when a bending moment is applied to the column 17 can be increased. Further, the bottom surface of the bottom plate 11 is in contact with the concrete foundation, and the bottom surfaces of the portions of the pedestals 16 to 16C that protrude from the bottom plate 11 are floating from the concrete foundation, so that concentration of stress can be prevented. Further, the protrusion 12 has a concave shape and its lower part is formed thin, and the bottom plate 12 is also relatively small, so that weight reduction and material savings can be achieved.

Fig. 3 is a plan view showing a state in which a column is welded to the column base hardware according to the invention of Fig. 2 and fixed to a concrete foundation, and Fig. 4 is a front view partially shown in cross section. The same reference numerals are given to the same or equivalent parts as in FIG. The difference between the column base hardware of the present invention and the first invention is that the diameters of the holes 15 to 15C (see Fig. 1) that fit into the anchor bolts are different from the first invention.
It is considerably larger than the diameter d of the anchor bolt, and in the example, D = 1.2 to 2. Various types of Od were used. Note that 21 is a concrete foundation, 22 is a grout mortar, and 23 to 23C are anchor bolts embedded in the concrete foundation 21.

In the present invention, as described above, the diameters of the holes 15 to 15C provided at the four corners of the column base hardware 10 are formed to be considerably larger than the diameter d of the anchor bolts 23 to 23C.
The work of fitting the holes 15 to 15C into the holes 15 to 23C is extremely easy, and even if the anchor bolts 23 to 23C are incorrectly positioned, they can be installed in the predetermined position by moving the column base hardware 10. can. In the present invention, after positioning the column base metal fitting 10, in order to prevent movement of the column base metal fitting 10, the outer diameter of the leg has a T-shaped cross section and matches the diameter of the holes 15 to 15C. A washer 24 with a through hole 25 provided in the center or at an eccentric position is inserted into the hole 15-15C of the column base hardware 10 from the anchor bolt 23-23C, and the hole 15-15C and the anchor bolt 23-23C are inserted.
It is designed to fill the gap between the two and fix it with nuts 26 to 26C. Note that 18 is a beat made by welding the column 17 to the metal fittings for the column base.

FIG. 5 shows the relationship between the hole 15 provided in the column base hardware 10, the anchor bolt 23, and the washer 24, and (a) shows the relationship between the anchor bolt 23 and the washer 24. and the center 07 of the hole 15 are almost the same, and the through hole 25 is located in the center.
A washer 24 is used.

(b) shows a case where the center 01 of the anchor bolt 23 and the center O7 of the hole 15 are slightly shifted by δ1, and a washer 24 in which the through hole 25 is provided slightly eccentrically is used.

Further, (C) shows a case in which both centers O1 and O2 are greatly deviated by 62, and a washer 25 in which the through hole 25 is provided with a large eccentricity is used.

As described above, in the present invention, by preparing three types of washers 24, in most cases, the column base hardware 10
can be fixed in the correct position.

In the above explanation, as shown in Fig. 6(a), a washer 24 with a T-shaped cross section and a through hole 25 provided in the center or at an eccentric position was used. You may also use a T-shaped washer 24 with a through hole 25 in the center or at an eccentric position. Since it will fall down, it is necessary to insert a stopper under the hole 15.

Although the embodiments of the cylinder 1 and the second invention have been described above, the invention is not limited to the above embodiments, and can be modified as appropriate without departing from the gist of the inventions.

[Effects of the Invention] As is clear from the above description, according to the present invention, the hole for fitting the anchor bolt is provided in a position away from the protrusion of the column base hardware, so that the anchor bolt is not affected by the bending moment. The effects of implementation are significant, such as being able to increase the resistance, and even if there is a construction defect in embedding the anchor bolt, the metal fittings for the column base can be fixed in the correct position.

[Brief explanation of the drawing]

FIG. 1 is a plan view of an embodiment of the first invention, FIG. 2 is a partially sectional front view thereof, FIG. 3 is a plan view of an embodiment of the second invention, and FIG. 5(a) to 5(C) are explanatory views showing the relationship between the hole provided in the column base hardware of the second invention, the anchor bolt, and the washer;
FIGS. 6(a) and 6(b) are perspective views of an embodiment of the washer;
FIG. 7 is a plan view showing an example of a conventional hardware for sliding skin, and FIG. 8 is a front view thereof. lO: Hardware for column base, 11: Bottom plate, 12: Projection, 15~
15C/hole, 16~16C pedestal, 17: Column, 21: Concrete foundation, 23~23C: Anchor bolt, 24.
Washer, 25: Penetrating agent Patent attorney Tadashi Sato Figure 1 it) Figure 2 LO ('Jha 1, Indication of the case Patent application No. 139161/1988 2, Title of invention Hardware for column base and its fixing Device (1 other person) 4. In the second line of page 13 of the agent's statement, "5 (&) to (e)" was replaced with "Figure 5 (IL) to (c)". to correct.

Claims (3)

[Claims] (1) A hardware comprising a bottom plate, a protrusion provided on the top surface of the bottom plate to which a column base is fixed, and a plurality of pedestals provided in the bottom plate and having holes for fitting anchor bolts, Holes 15 to 15C that fit into the anchor bolts are provided at the four corner ends of the bottom plate 12, and the holes 15
A metal fixture for a column base, characterized in that pedestals 16 to 16C are provided around 15C, a part of which protrudes from the bottom plate 12, and the bottom surfaces of the pedestals 16 to 16C are provided above the bottom plate 12. (2) A hardware comprising a bottom plate, a protrusion provided on the top surface of the bottom plate to which a column base is fixed, and a plurality of pedestals provided in the bottom plate and having holes for fitting anchor bolts, Holes 15 to 15C that fit into anchor bolts are formed at the four corner ends of the bottom plate 12 and are considerably larger in diameter than the anchor bolts.
Pedestals 16 to 1, a part of which protrudes from the bottom plate 12, around the
6C, and the bottom surfaces of the pedestals 16 to 16C are provided above the bottom surface of the bottom plate 12. A fixing device for a column base hardware, comprising a washer 24 having a through hole 25 provided therein, and fixing the column base hardware 11 to anchor bolts 23 to 23C via the washer 24. (3) The relationship between the diameter D of the holes 15 to 15C that fit into the anchor bolts and the diameter d of the anchor bolts 23 to 23C is D.
3. The device for fixing metal fittings for column bases according to claim 2, characterized in that =1.2 to 2.0d.