JPH07102639A - Column base hardware and construction method for steel frame column base section - Google Patents

Abstract

PURPOSE:To easily execute a construction work and reduce cost by obtaining column base hardware having a shape suitable for stress distribution as well as allowing the easy filling of post-cast mortar and the easy detection of a filling condition, and then using the hardware for the construction work. CONSTITUTION:This hardware is formed to be suitable for a stress condition occurring in a steel frame column 1, and an anchor bolt hole 23 where an anchor bolt 5 is inserted, is made large. Also, a filling hole 24 for post-cast mortar 11 and a filling condition detecting hole therefor are provided so as to be communicated with the anchor bolt hole 23.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exposed steel column post of a building such as a building, in which a stress and rigidity are ensured so that the stress generated in the steel column can be reliably transmitted to the foundation beam, And a method of constructing a steel column base using the column base metal.

[0002]

2. Description of the Related Art A typical example of a conventional exposed steel column base structure is shown in FIG. This steel column base is a cast steel column base metal 2 welded to a steel frame column 1 fixed to a base concrete 9 and a base rebar 4 by an unbonded anchor bolt 5 and a fixing plate 6.

The procedure for erection is as follows. First, the reinforcing bar 4 and the fixing plate 6
After the unbonded anchor bolt 5 having the above is constructed, the foundation concrete 9 is poured. Next, a center-painted mortar 10 is applied onto the basic concrete 9, and a steel frame pillar 1 is constructed by welding a column base metal piece 2 having a shape suitable for the stress distribution of the steel frame pillar 1 as shown in FIG. Then, the anchor bolt holes 3 of the column base metal fitting 2 are fitted into the unbonded anchor bolts 5 and fixed with the nuts 7. Then, the backfilling mortar 11 is installed in the gap formed between the column base metal member 2 and the basic concrete 9 and hardened. The diameter d ₁ of the anchor bolt hole 3 of the pillar pedestal 2 is larger than the diameter d of the unbonded anchor bolt 5 by about 5 mm.

FIG. 14 shows another typical example of a steel column base structure, in which a base plate 12 made of a steel plate welded to the steel column 1 is used as a base concrete 9 by a bond type anchor bolt 5a and an anchor frame 15. And basic rebar 4
It is fixed to.

In the procedure of erection, first, the foundation rebar 4, the anchor frame 15 and the anchor bolt 5a are constructed, and then the foundation concrete 9 is poured. Next, as shown in FIG. 15, a center-coated part mortar 10 is constructed on the foundation concrete 9, the steel frame column 1 to which the base plate 12 is welded is built on this, and the injection washer 16 is inserted into the bond type anchor bolt 5a. And fix with nut 7. Then, the clearance between the anchor bolt hole 13 and the anchor bolt 5a provided in the base plate 12, and the base plate 12
The injection washer 16 in the gap between the base and the concrete 9
The back-filled mortar 11 is injected from the injection port 17 of and is cured. In addition, the anchor bolt hole 1 of the base plate 12
The diameter d ₂ of 3 is larger than the diameter of the anchor bolt 5a by about 20 mm.

[0006]

In the conventional method shown in FIGS. 12 and 13, the diameter of the anchor bolt hole 3 of the column base metal member 2 is only 5 m, which is smaller than the diameter of the unbonded anchor bolt 5.
Since it is only about m large, it is necessary to secure sufficient accuracy in the position of the unbonded type anchor bolt 5 and the position of the anchor bolt hole 3 of the column base metal fitting 2 when constructing the steel frame column 1. There is a problem that it is extremely troublesome and requires a lot of man-hours.

Further, in the conventional method shown in FIGS. 14 and 15, instead of a column base metal member having a shape adapted to the stress distribution, a steel plate base plate 1 having a mechanically unnecessary portion is formed.
2 and the special structure of the injection washer 16
Since the stuffing mortar 11 is injected via the above, the cost is high, and the stuffing mortar 11 is also expensive.
However, there is a problem that the injection work becomes complicated.

The present invention has been made to solve the above-mentioned problems, and has a shape adapted to the stress distribution, and on top of that, the post-filling mortar can be easily injected and the injection state can be reliably detected. The purpose is to obtain a metal fitting. Further, it is an object of the present invention to obtain a method of constructing a steel column base by using the above-described column pedestal, which is easy to construct and can reduce the cost.

[0009]

The pedestal metal article according to the present invention is configured to have a shape adapted to the stress state generated in the steel frame column, has a large anchor bolt hole, and communicates with the anchor bolt hole. And a filling detection hole for detecting the filling state of the back-filled mortar.

Further, in the above-mentioned column pedestal, the diameter of the anchor bolt hole is 15 mm to 3 mm larger than the diameter of the anchor bolt.
It is formed to have a size of about 0 mm, preferably about 20 mm. Further, the anchor bolt is provided with an elliptical washer used for fixing the pillar pedestal.

Further, the method of constructing the steel column foot portion according to the present invention is configured to have a shape adapted to the stress state generated in the steel column, and the anchor bolt hole to be inserted into the anchor bolt embedded in the basic concrete is formed large. At the same time, it has a steel column to which the column pedestal with the filling hole and the filling detection hole for the backfilled mortar in communication with the anchor bolt hole is fixed, and the column pedestal of this steel column is constructed on the foundation concrete. Installed on the mortar that has been painted centrally, insert the anchor bolt holes into the anchor bolts to fix them, and then insert the holes from the injection holes between the anchor bolt holes and the anchor bolts and between the column pedestals and the foundation concrete. Back-filled mortar into the space between the column base metal and the foundation concrete, if necessary. When justified mortar overflows are those so as to cure discontinue infusion. Further, when inserting and fixing the anchor bolt hole of the column pedestal into the anchor bolt, an elliptical washer is inserted into the anchor bolt and fixed with a nut.

As described above, the method of constructing a column pedestal and a steel frame column pedestal according to the present invention is such that the column pedestal has a rational structure that matches the stress state applied thereto, and the anchor bolt of the column pedestal. It is characterized by forming a large hole diameter, providing a dedicated backfill mortar injection hole and filling detection hole communicating with the anchor bolt hole, and using an oval washer. As a result, there is no waste of material, it is easy to construct the steel frame column with respect to the anchor bolt, and it is possible to reliably fill the back-filled mortar.

[0013]

【Example】

First Embodiment FIG. 1 is a configuration explanatory diagram of a first embodiment of the present invention. The same parts as those of the conventional technique described with reference to FIGS. 12 to 15 are denoted by the same reference numerals, and the description thereof will be omitted. In the figure,
Reference numeral 20 denotes a column base metal piece, and FIG. 2 is a plan view thereof, and FIG. 3 is an enlarged partial sectional view taken along line AA of FIG.

This column base metal 20 is made of cast steel or forged steel having a shape adapted to the stress distribution of the steel frame column 1, and a welded portion 21 of the rectangular steel tube column 1 is projected at the center thereof. And a plurality of seats 22 are provided at symmetrical positions around it. As shown in FIG. 4, anchor bolt holes 23 are provided at the center of each seat 22, and the anchor bolt holes 23 are communicated with the anchor bolt holes 23 on both sides of the upper surface and the seat 22. A filling hole 24 for the backfilled mortar and a filling detection hole 25 for detecting the filling state of the backfilled mortar 11 are provided in the side wall of the. The diameter d ₃ of the anchor bolt hole 23 is 15 mm to 30 mm from the diameter d of the unbonded anchor bolt 5 as shown in FIG.
It is formed to a large extent.

In order to construct the steel frame column 1 to which the column base metal fitting 20 is fixed as described above, first, the center is placed on the foundation concrete 9 on which the unbond type anchor bolt 5 having the foundation rebar 4 and the fixing plate 6 is constructed. Apply painted part mortar 10,
Build the steel column 1 with the column base metal 20 welded on it,
The nut 7 is screwed into and fixed to the unbonded anchor bolt 5 through a flat washer 8a having a size that covers the upper portion of the seat 22.

Next, the unbonded anchor bolt 5 is inserted through the injection hole 24 opened in the side wall of the seat 22 of the column base metal member 20.
The stuffed mortar 11 is poured into the gap formed between the base bolt 9 and the anchor bolt hole 23 and the gap formed between the pedestal metal fitting 20 and the foundation 9 and hardened. At this time, the work can be reliably performed by injecting the filling mortar 11 from the filling detection hole 25 provided in the column base metal member 20 until it overflows.

In this case, the backfilled concrete 11 may be poured from the periphery of the column base metal fitting 20 into the gap formed between the column base metal base 20 and the basic concrete 9. In addition, the diameter d ₃ of the anchor bolt hole 23 of the column base metal fitting 20 is
As described above, it is formed to be larger than the diameter d of the unbonded anchor bolt 5 by about 15 mm to 30 mm, but according to the results of the experiment, the strength of the column base metal 20, the erection of the steel column 1, and the rear-filling mortar 11 are determined. In terms of ease of injection,
It has become clear that the difference between the two is preferably about 20 mm (thus, the gap between the two is about 10 mm).

According to the present embodiment constructed as described above, the stress (axial force, bending moment and shearing force) of the steel frame column 1
Is through the column base metal 20, the central coating part mortar 10, the backfilled mortar 11, and the unbonded anchor bolt 5.
It is transmitted to the base concrete 9 and the base rebar 4.

Second Embodiment A second embodiment of the present invention is shown in FIGS. In this embodiment, instead of the unbonded type anchor bolts 5 of the first embodiment, four bond type anchor bolts 5a are used to construct the steel column 1.
The column base metal member 20 welded to is fixed, and the other configurations and the construction method thereof are the same as those in the first embodiment. In addition, in the first and second embodiments, the case where the square steel pipe is used as the steel frame column 1 is shown.
Round steel pipe may be used. Also, although I did not specifically explain,
The present invention can also be implemented in the case of a construction method using the anchor frame 15 as shown in FIG.

Embodiment 3 FIG. 8 is a plan view of a third embodiment of the present invention, and FIG.
It is a B expanded sectional view. In the figure, 20 is a cast-iron or wrought-steel column pedestal, and a welded portion 21 of the steel column 1 is projected at the center of the base having a shape adapted to the stress distribution of the steel column 1. The inside of the portion 21 is formed in a concave shape to reduce the weight. Reference numeral 23 denotes anchor bolt holes penetrating at four corners of the column base metal fitting 20, communicating with the anchor bolt holes 23 on both sides thereof, and injecting rearward-filled mortar having a semicircular cross section whose upper surface is open and whose outer end is closed. A hole 24 and a filling detection hole 25 for detecting the filling state of the back-filled mortar are provided respectively. The diameter of the anchor bolt hole 23 is larger than the diameter of the anchor bolt 5 by about 15 mm to 30 mm, preferably about 20 mm.

Reference numeral 27 denotes a washer which is arranged between the upper surface of the column base metal piece 20 and the nut 26 when the column base metal piece 20 is fixed to the anchor bolt 5, and its outer shape is elliptical as shown in FIG. An anchor bolt insertion hole 28 that is slightly larger than the diameter of the anchor bolt 5 is provided in the center portion.

The procedure for assembling the steel frame pillar 1 to which the column base metal fitting 20 is fixed is almost the same as in the first and second embodiments, but the anchor bolt hole 23 of the column base metal fitting 20 is inserted into the anchor bolt. 5a, respectively, and then the anchor bolt insertion hole 28 of the washer 27 is fitted into the anchor bolt 5a to be positioned on the upper surface of the column base metal member 20, and the nut 26 is tightened and fixed.

At this time, if the anchor bolt 5a is well constructed and the positional accuracy is secured, the anchor bolt hole 23 is substantially concentric with the outer periphery of the anchor bolt 5a when the column base metal fitting 20 is installed. Position. In this case, for example, as shown in FIG.
The long axis may be arranged on the line connecting the corner and the center of the column base metal 20, and therefore orthogonal to the mortar injection hole 24 and the filling detection hole 25.

As a result, both ends of the washer 27 on the major axis side are brought into contact with the upper surface of the pedestal metal fitting 20 to reliably perform the function of the washer, and mortar injection holes 24 are provided on both sides of the minor axis. The filling detection hole 25 is opened so that the mortar can be easily injected and the filling state of the mortar can be detected.

Further, when the anchor bolt 5a is located at a biased position in the anchor bolt hole 23, for example, as shown in FIG.
As shown in (b) or (c), by disposing the washer 27 such that its long axis is substantially parallel to one edge or the other edge of the column base metal fitting 20, the long axis of the washer 27 is set. Both end portions of the side contact the upper surface of the column base metal member 20, and a mortar injection hole 24 and a filling detection hole 25 are opened on both sides of the washer 27.

Thus, in this embodiment, the washer 2
Since 7 is formed into an elliptical shape and the anchor bolt insertion hole 28 is provided in the center thereof, the mounting angle of the washer 27 can be appropriately adjusted even when the positional accuracy of the column base metal member 20 with respect to the anchor bolt 5a is not sufficiently ensured. By changing it, the function of the washer can be surely exhibited, and the openings of the mortar injection hole 24 and the filling detection hole 25 for detecting the filling state of the mortar can be secured.

In each of the above-mentioned embodiments, the case where the square steel pipe is used as the steel column is shown, but a circular steel pipe may be used.
Further, although not particularly described, the present invention can be implemented even in the case of a construction method using an anchor frame as shown in FIG. Furthermore, the washer shown in the third embodiment can be applied to the first and second embodiments or the conventional method.

[0028]

As described above, the pillar pedestal according to the present invention has a rational structure made of cast steel or forged steel in accordance with the stress state applied to the pillar pedestal, and the diameter of the anchor bolt hole of the pillar pedestal is adjusted. 15mm to 30mm from the diameter of the anchor bolt
The injection hole and the filling detection hole for the special stuffing mortar that is formed to a large size and communicates with the anchor bolt hole are provided, and the injection hole is provided in the gap between the anchor bolt hole and the anchor bolt The backfilling mortar 11 was injected from 24, and the backfilling mortar overflowed from the filling detection hole by injecting the backfilling mortar from the periphery of the column base metal between the column base metal and the foundation concrete as required. In this case, the injection is stopped and the resin is cured, and the following remarkable effects can be obtained.

(1) Since the pillar pedestal has a shape adapted to the stress distribution generated in the steel frame pillar, there is no waste of material. (2) Since the anchor bolt hole of the column base metal is configured to be large, it is possible to easily construct the steel column even if the positional accuracy with respect to the anchor bolt is not sufficiently secured. Is also easy.

(3) Since the post-filling mortar injection hole and the filling detection hole are provided in the column base metal, there is no need for a conventional injection washer having a special structure, and construction and injection of the post-filling mortar are easy. Moreover, it is possible to reliably detect the filling state of the back-filled mortar. (4) From the above, labor saving in construction, shortening of construction period,
The cost can be reduced.

(5) Further, since the pedestal metal object is fixed through the washer having the anchor bolt insertion hole at the center, even if the positional accuracy of the pedestal metal object with respect to the anchor bolt is not sufficiently secured. By properly changing the mounting angle of the washer, the function of the washer can be exhibited, and the opening of the mortar injection hole and the filling detection hole for detecting the filling state of the mortar can be secured.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view for explaining a first embodiment of the present invention.

FIG. 2 is a plan view of the column pedestal of FIG.

3 is a side view of a pedestal metal piece, a part of which is taken along the line AA in FIG. 2. FIG.

FIG. 4 is a plan view (a) and a side view (b) of a main part of the column pedestal of FIG.

FIG. 5 is an explanatory diagram showing a construction state of the first embodiment.

FIG. 6 is a sectional view for explaining a second embodiment of the present invention.

FIG. 7 is a plan view of the column pedestal of FIG.

FIG. 8 is a plan view of a column pedestal of a third embodiment of the present invention.

9 is a side view of a pedestal metal piece, a part of which is taken along the line BB of FIG. 8. FIG.

FIG. 10 is a plan view and a side view of an embodiment of a washer.

11 (a), (b) and (c) are explanatory views of the operation of the third embodiment.

FIG. 12 is a cross-sectional view of an example of a conventional steel column base structure.

FIG. 13 is a plan view (a) of the column base metal fitting of FIG. 12 and B thereof.
-B is a sectional view (b).

FIG. 14 is a perspective view of another example of the conventional steel column base structure.

FIG. 15 is an explanatory view showing a construction state of the conventional example of FIG.

[Explanation of symbols]

 1 Steel column 4 Reinforcing bar 5, 5a Anchor bolt 9 Foundation concrete 20 Column base metal fittings 22 Seat 23 Anchor bolt hole 24 Injection hole 25 Filling detection hole 26 Nut 27 Washer 28 Anchor bolt insertion hole

Front page continued (72) Inventor Shinji Suzuki 2-1, Shiraishi-cho, Kawasaki-ku, Kawasaki-shi, Kanagawa Nihon Foundry Co., Ltd.

Claims (5)

[Claims] 1. A column pedestal attached to a steel frame column and fixed on a foundation concrete by anchor bolts, the anchor bolt hole having a shape adapted to a stress state generated in the steel frame column and inserted into the anchor bolt. And a filling detection hole for detecting the filling state of the back-filled mortar, which is communicated with the anchor bolt hole and opens on the upper surface, and a filling detection hole for detecting the filling state of the back-filled mortar. 2. The column pedestal according to claim 1, wherein the diameter of the anchor bolt hole is larger than the diameter of the anchor bolt by 15 to 30 mm, preferably about 20 mm. 3. The column pedestal according to claim 1, further comprising an elliptical washer having an anchor bolt insertion hole at a central portion thereof. 4. A method of constructing a steel column base, comprising fixing a column pedestal attached to a steel frame column on a foundation concrete with anchor bolts, wherein the steel frame column is constructed in a shape adapted to a stress state occurring in the steel column. While forming a large anchor bolt hole to insert into the anchor bolt embedded in concrete,
The steel column has a steel column to which a post-filling mortar injection hole and a filling detection hole, which communicate with the anchor bolt hole and open on the upper surface, are fixed, and the steel column post is mounted on the foundation concrete. Installed on the mortar coated centrally, the anchor bolt hole is inserted into the anchor bolt and fixed, and then from the injection hole between the anchor bolt hole and the anchor bolt and between the column base metal and the concrete foundation. While injecting backfilled mortar into the gap formed in, if necessary, injecting backfilled mortar from around the column base metal between the column base metal and the foundation concrete, the backfilled mortar from the filling detection hole is When overflowing, the method of constructing a steel column base is characterized by stopping injection and hardening. 5. A method for constructing a steel column foot, comprising fixing a column pedestal attached to a steel column on a foundation concrete with anchor bolts, wherein the steel frame column has a shape adapted to a stress state generated in the steel column. While forming a large anchor bolt hole to insert into the anchor bolt embedded in concrete,
The steel column has a steel column to which a post-filling mortar injection hole and a filling detection hole, which communicate with the anchor bolt hole and open on the upper surface, are fixed, and the steel column post is mounted on the foundation concrete. Installed on the mortar coated centrally, the anchor bolt hole is inserted into the anchor bolt, and then the anchor bolt insertion hole provided in the center of the oval washer is inserted into the anchor bolt and fixed with a nut. Then, while injecting a back-filled mortar from the injection hole into the gap formed between the anchor bolt hole and the anchor bolt and between the column base metal product and the base concrete, if necessary, It is characterized by injecting backfilled mortar from around the column base metal in between, and when the backfilled mortar overflows from the filling detection hole, the injection is stopped and cured. The method of constructing a steel column base.