JPS62284846A - Metal fitting for column base and fixing structure thereof - 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 provides a metal fitting for a column base in which a steel column is fixed to a concrete foundation by an anchor bolt in a civil engineering building structure. and its fixing structure.

[Conventional technology]

In civil engineering and architectural structures, steel columns (hereinafter referred to as columns) 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 column base hardware to which the lower end of the column is fixed is used. It is fixed to the concrete foundation using anchor bolts.

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. 6 and 7, this invention provides a protrusion 3 on the upper surface of a rectangular bottom plate 2, which is slightly larger than the cross-sectional shape of the pillar 6, and
A pedestal 4 having a hole 5 for fitting an anchor bolt to the pedestal 4
It has been established.

The above-mentioned column base hardware 1 is manufactured by welding 7 the outer periphery of the upper end of the protruding portion 3 and the lower end of the column 6 in a factory or the like, fixing both together and transporting them to the construction site, and then attaching the base of the column base hardware 1 to the base. The hole 5 provided in 4 is fitted with an anchor bolt 8 installed in the concrete foundation and fixed with a nut.

[Problem that the invention seeks to solve]

As is well known, three types of stress occur in columns of civil engineering and architectural structures: axial compressive force, bending (overturning) moment, and shear force, among which bending moment is predominant in ordinary pillars. For this reason, anchor bolts that resist bending moments should be placed as far outside the column base hardware 1 as possible.
That is, it is necessary to attach it at a position away from the protrusion 3.

However, in order to mount the anchor bolt at a position away from the protrusion 3, the bottom plate 2 must be made that much larger, and the metal fittings 1 for the column base as described above may not be manufactured by die forging or casting. Since there are many parts, the size of the bottom plate 2 increases and the weight becomes large, which not only makes handling troublesome, but also increases the material cost, making it expensive. Furthermore, if the bottom plate 2 is made larger, even if the column base hardware 1 is installed at the very edge of the site, the columns 6 will move away from the boundary line and become inside, resulting in many problems such as the inability to utilize the site effectively.

[Means for solving problems]

The present invention was made to solve the above-mentioned problems, and includes a bottom plate having an upper part formed in a shape corresponding to the outer shape of the column and a lower part having a substantially inverted trapezoidal cross section. A lower part of the column fixing part is fixed, a hole is provided in the bottom plate inside the fixed part of the column fixing part, a plurality of ribs are provided between the bottom plate and the column fixing part, and an anchor bolt is fitted to the bottom plate. A column base hardware with multiple fitting holes. The bottom plate has an upper part formed in a shape corresponding to the external shape of the pillar, and a lower part formed smaller than the upper part to fix the lower part of the pillar fixing part, which has an almost inverted trapezoidal cross section, and at the inside of the fixing part of the pillar fixing part. A column base metal fitting is provided in which a hole is provided in the bottom plate, a plurality of ribs are provided between the bottom plate and the column fixing part, and a plurality of fitting holes are provided in the bottom plate to fit into anchor bolts. The foot hardware is placed on the concrete foundation via a spacer, etc., and the anchor bolts are fitted into each of the fitting holes to fix it. At the same time, the internal anchor bolt is inserted into the column fixing part, and the concrete 1. The present invention provides a structure for fixing a column control hardware by filling the space between the foundation and the bottom plate of the column base hardware and the inside of the column fixing part with molcle or the like.

[Effect]

In the column base hardware of the present invention, each anchor bolt is fitted into a fitting hole provided in a bottom plate, and an internal anchor bolt is inserted into a column fixing portion and these are fixed together with mortar or the like.

〔Example〕

FIG. 1 is a plan view of an embodiment of the hardware for a follower column base according to the present invention, and FIG. 2 is a sectional view thereof taken along line A-A. In both figures, 11 is a bottom plate made of a steel plate, 12 is a rectangular shape whose upper part corresponds to the outer shape of the rectangular tubular column to which it is fixed, and whose lower part is formed into a smaller rectangular shape and whose cross section is approximately an inverted trapezoidal shape. , the lower end of which is fixed to the bottom plate 11 by welding or the like. Reference numeral 13 indicates a bottom plate 11 corresponding to the shape of the upper end of the column fixing part 12.
This is a hole drilled through the hole. 14 is the bottom plate 11 and the column fixing part 12
A large number of ribs are fixed between the two to reinforce them. Reference numeral 15 indicates a fitting hole for an anchor bolt provided between the bottom plate 11 and the rib 14.

FIG. 3 is a cross-sectional view showing an example of the structure in which the column base hardware 10 according to the present invention is attached to a concrete foundation, and FIG.
The same parts as in the figure are given the same reference numerals. Reference numeral 19 indicates a concrete foundation 2 corresponding to each fitting hole 15 of the column base hardware 10.
Anchor pols embedded in 0) and only two are shown in the figure. Reference numeral 21 indicates an internal anchor bolt with a head embedded in the concrete (concrete) foundation 20 corresponding to the hole 13 of the column base hardware 10. Two bolts are shown in the figure, but one or more may be used. . 17 is a column fixed to the upper end of the column fixing part 12 by welding, and 18 is a hole for pouring mortar or the like provided in the lower part of the column 17.

Now, on the concrete 1/foundation 20, the column base metal fittings 10 with five columns 17 fixed at a certain distance via spacers, wedges, etc. are placed, and each fitting hole 15 provided in the bottom plate 11 is inserted. Each anchor bolt 19 is fitted, and the hole 13 is inserted into the internal anchor bolt 21. In this state, set the position and level of the column base hardware 10 to 1[, and anchor bolt 19
Tighten the nut to secure it.

Next, from the hole 18 made in the pillar 17, the concrete foundation 20
Grout mortar or the like 22 is injected between the bottom plate 11 and the column attachment part 12 to fill these spaces, and the column base hardware 10 is attached to the concrete base 20 together with the anchor bolts 19 and internal anchor bolts 21. Fix it firmly.

As described above, the column base hardware 10 according to the present invention is fixed by a large number of anchor bolts 19 and an internal anchor pole with a head (21) protruding into the column fixing part 12. Since the lower part is smaller than the upper part, the grout mortar etc. 22 filled inside becomes triaxially compressed to increase the strength, further increasing the effect of the internal anchor bolt 21 and increasing the rigidity.

FIG. 4 shows another embodiment of the present invention. In this embodiment, the bottom plate 11 is made thicker, the lower part of the column fixing part 12 is made thicker, and the upper part is made thinner, so that the section modulus in the vertical direction is almost equal. It is constructed by casting etc. so that

In the example of FIG. 3, the internal anchor bolt 21 is embedded in the concrete 1/foundation 20, but as shown in FIG. A plurality of anchor bolts 21a each having a head at least on the upper part are fixed in a fixing member 23 to which a large number of deformed reinforcing bars, anchor bolts with heads, etc. are fixed, so that their upper parts protrude from the member 24, and then the anchor bolts 21a are fixed to the fixing member 23 to which a large number of deformed reinforcing bars, anchor bolts with heads, etc. are fixed. -1. It is embedded directly under the hole 13 of the column base hardware 10 of the foundation 20 so that the internal anchor pole I-21a protrudes into the column fixing part 12 of the column base hardware 10. With this configuration, it is possible to increase the strength of the internal anchor bolt 21a and shorten its length.

In the above description, the column fixing part 12 provided on the column base hardware 10 is
shows a case in which both the upper and lower sides are square, but the upper part needs to correspond to the shape of the pillar 17, but the lower part may be made into a polygon more than a square, a circle, etc., and the rib 14, fitting The position and number of holes 15 can also be changed as appropriate.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, the hardware for the column base can be made smaller and lighter, and the material cost can be reduced. It is now possible to place the pillars close to the boundary line,
Site area can be used effectively. In addition, the lower end of the column fixing part that fixes the column is made smaller than the upper part, and internal anchor bolts are placed inside this part and filled with grout mortar, etc., so the triaxial compression effect works together with the external anchor bolt to secure the column. The effects of implementation are significant, such as being able to securely fix the leg hardware to the concrete foundation.

[Brief explanation of the drawing]

FIG. 1 is a plan view of an embodiment of the present invention, FIG. 2 is a cross-sectional view taken along the line A-A, FIG. FIG. 5 is a perspective view of an example of a fixing member that can be implemented in the invention shown in FIG. 3, and FIG. 6 is a longitudinal sectional view of another embodiment of the present invention. A plan view showing an example, FIG. 7 (this is a front view showing a cross section of the other part. 10: Column base hardware, 11: Bottom plate, 12: Column fixing part 13:
Hole, 14: Rib, 15: Anchor bolt fitting hole, 1
7: Column, 19: Anchor bolt, 20: Concrete foundation, 21.21a: Internal anchor pole l-122:
Grout mortar 23: Fixing member.

Claims (2)

[Claims] (1) A lower part of a column fixing part 12 having an approximately inverted trapezoidal cross section, whose upper part is formed in a shape corresponding to the outer shape of the column 17 and whose lower part is smaller than the upper part, is fixed to the bottom plate 11, and the column fixing part 12 is fixed to the bottom plate 11. A hole 13 is provided in the bottom plate 11 on the inside of the fixing part, a plurality of ribs 14 are provided between the bottom plate 11 and the column fixing part 12, and an anchor bolt 19 is provided in the bottom plate 11.
A column base hardware provided with a plurality of fitting holes 15 that fit into the column base. (2) A lower part of a column fixing part 12 having an approximately inverted trapezoidal cross section, whose upper part is formed in a shape corresponding to the outer shape of the column 17 and whose lower part is smaller than the upper part, is fixed to the bottom plate 11, and the column fixing part A hole 13 is formed in the bottom plate 11 inside the fixed portion of 12.
A plurality of ribs 14 are provided between the bottom plate 11 and the column fixing part 12, and anchor bolts 1 are provided on the bottom plate 11.
The column base metal fitting 10 is provided with a plurality of fitting holes 15 that fit into the respective fitting holes 9, and the column base metal fitting 10 is disposed on a concrete foundation 20 via a spacer or the like. At the same time, an internal anchor bolt 21 is inserted into the column fixing part 12 to secure the space between the concrete foundation 20 and the bottom plate 11 of the column base hardware 10 and inside the column fixing part 12. A fixing structure for metal fittings for column bases, which is formed by filling mortar or the like 22 into the base.