JP2021169722A - Column base structure - Google Patents

Abstract

To provide a column base structure that enables a brace section to move smoothly along with the rotational deformation of a column section and base plate section, prevents cracks in the concrete around the brace section joined to the column section and base plate section, and prevents water from entering through the cracks in the concrete.SOLUTION: A column base structure comprises a column section 1, a base plate section 2 installed at the lower end of the column section 1, and a brace section 3, wherein the base plate section 2 is fixed to a foundation 6 via anchor bolts 7. The brace section 3 is covered with concrete 11, and an elastic edging material 17 is installed between the brace section 3 and the concrete 11.SELECTED DRAWING: Figure 1

Description

The present invention relates to a column base structure including a column portion, a base plate portion provided at the lower end of the column portion, a brace portion, and a covering material for covering the brace portion.

An elastic edge cutting material is placed between the column material and the base plate attached to the lower end of the column material and a covering material such as concrete, and the stress due to the rotational deformation of the column material and the base plate is absorbed by the edge cutting material. Therefore, the applicant has previously proposed a column base structure that prevents cracks in the covering material and prevents water from entering through the cracks (see Patent Document 1 and Patent Document 2).

Japanese Patent Application No. 2019-127906 Japanese Patent Application No. 2019-239023

In a general structure, a brace portion is joined to the lower part of the outer peripheral surface of the column material, and the surface of the brace portion is often covered with a covering material.
In such a case, the brace portion also rotates in the covering material together with the column material and the base plate, but as in the column base structure described in Patent Document 1 and Patent Document 2, the column material, the base plate and the covering material The movement of the brace portion is restrained only by providing the edge cutting material between them, and as a result, the rotational deformation of the column or the base plate is hindered, or the covering material is cracked around the brace portion, and water infiltrates through the crack. Therefore, there is a risk of causing a decrease in the strength and durability of the column base structure.

The problem to be solved by the present invention is that the brace portion can move smoothly with the rotational deformation of the column portion and the base plate portion, and the covering material is cracked around the brace portion joined to the column portion. It is intended to provide a column base structure that is difficult and prevents water from entering through cracks in the covering material.

The invention according to claim 1 of the present application includes a pillar portion, a base plate portion provided at the lower end of the pillar portion, and a brace portion, and the base plate portion is deformably fixed to the foundation via anchor bolts. It is a column base structure, characterized in that the lower portion of the brace portion is covered with a covering material, and an elastic edge cutting material is installed between the brace portion and the covering material. ..

The invention according to claim 2 of the present application is the column base structure according to claim 1, wherein the edge cutting material covers the lower portion of the outer peripheral surface of the brace portion.

In the invention according to claim 3, the brace portion has a brace material and a gusset plate attached to an end portion of the brace material, and the gusset plate is at least the lower part of the outer peripheral surface of the pillar portion. The second aspect of the present invention is characterized in that the edge cutting material is installed between the front and rear surfaces and the inner end surfaces of the brace portion and the covering material, which is joined to any one of the upper surfaces of the base plate portion. It is the column base structure of.

In the invention according to claim 4, the gusset plate is attached to the end of the brace material via a fixture, and a notch corresponding to the attachment portion of the brace material is formed on the front and rear surfaces of the gusset plate. The third aspect of the invention, wherein the edge cutting material for the side surface is joined, and the edge cutting material for the lid covering the notch is attached to the outer surface of the edge cutting material for the side surface. It is a column base structure.

The invention according to claim 5 of the present application is the column base structure according to claim 4, wherein a waterproof material is filled between the edge cutting material for the lid and the brace portion.

The invention according to claim 6 of the present application includes a pillar portion, a base plate portion provided at the lower end of the pillar portion, and a brace portion, and the base plate portion is deformably fixed to the foundation via anchor bolts. In a leg structure, the lower portion of the brace portion is covered with a covering material, and the covering material includes a first covering portion and a second covering portion located on the brace portion side of the first covering portion. The column base structure is characterized in that an elastic edge cutting material is installed between the first covering portion and the second covering portion.

The invention according to claim 7 of the present application is described in claim 6, wherein the edge cutting material is installed so as to surround the lower part of the outer peripheral surface of the brace portion via the second covering portion. It is a column base structure.

In the invention according to claim 8, the brace portion has a brace material and a gusset plate attached to an end portion of the brace material, and the gusset plate is at least the lower part of the outer peripheral surface of the pillar portion. And one of the upper surfaces of the base plate portion, the front-rear surface and the inner end surface of the brace portion are covered with the second coating portion, and the edge between the first coating portion and the second coating portion. The column base structure according to claim 7, wherein a cutting member is installed.

The invention according to claim 9 of the present application is the column base structure according to any one of claims 1 to 8, wherein the edge cutting material has water blocking property.

According to the present invention, since an elastic edge cutting material is interposed between the brace portion and the covering material, the brace portion is smoothly rotationally deformed together with the column portion and the base plate portion, and the edge cutting material is elastically deformed to form the brace portion. It absorbs the stress caused by the rotation of the coating material, so that the coating material is hard to crack around the brace portion, and water can be prevented from entering through the cracking of the coating material.

In addition, by installing the edge dressing around the outer peripheral surface of the brace portion, the stress due to the rotation parallel to the surface including the brace portion and the rotation in the direction intersecting this surface can be applied to the edge cutting material. Elastically deforms and absorbs, preventing cracking of the coating material.

In addition, the inner end face of the gusset plate attached to the end of the brace prevents the load concentrated on a small area from cracking the covering material, and the gusset plate is deformed and damaged by the load applied from the front and back of the gusset plate. It can also be prevented.

In addition, by forming a notch corresponding to the attachment portion of the brace material on the side edge cutting material joined to the front and rear surfaces of the gusset plate, and covering the notch with the edge cutting material for the lid. The edge cutting material can be joined without difficulty while avoiding the fixtures protruding from the front and back of the brace portion.

In addition, if a waterproof material is filled between the edge cutting material for the lid and the brace portion, it is possible to prevent water from entering through the notch formed in the edge cutting material for the side surface.

In addition, the front and rear surfaces and the inner end surface of the brace portion to which the gusset plate is attached to the end portion of the brace material are covered with the second covering portion, and the edge cutting material is installed between the first covering portion and the second covering material. As a result, it is not necessary to form a notch in the edge cutting material to avoid the fixture protruding from the front and back of the brace portion, and the construction is facilitated.

In addition, since the edge cutting material has water blocking property, it is possible to more reliably prevent the ingress of water.

It is a vertical sectional view of the column base portion which shows the 1st Embodiment of this invention. It is a main part perspective view of the column base part which shows the 1st Embodiment of this invention. It is a front view of the main part of the brace part which concerns on 1st Embodiment of this invention. It is a main part exploded perspective view of the column base structure which shows the 1st Embodiment of this invention. It is sectional drawing of the main part of the column base structure which shows 1st Embodiment of this invention. It is a main part perspective view of the column base part which shows the 2nd Embodiment of this invention. It is a main part exploded perspective view of the column base part which shows the 3rd Embodiment of this invention. It is sectional drawing of the main part of the column base structure which shows the 4th Embodiment of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. Needless to say, the present invention is not limited to the embodiments.

[First Embodiment]
1 to 5 show a first embodiment of the present invention. 1 is a vertical cross-sectional view of the column base portion, FIG. 2 is a perspective view of a main part of the column base portion, FIG. 3 is a front view of the main part of the brace portion, and FIG. 4 is an exploded perspective view of the main part of the column base structure. , FIG. 5 is a cross-sectional view of a main part of the column base structure.

As shown in FIG. 1, the column base structure of the present embodiment includes a column portion 1 made of H-shaped steel column material, a base plate portion 2 made of a base plate provided at the lower end of the column portion 1, and an outer circumference of the column portion 1. A brace portion 3 joined to a lower surface and an upper surface 2a of the base plate portion 2 is provided.

The base plate portion 2 is a rectangular steel plate base plate, and the pillar portion 1 is joined to the central portion of the upper surface 2a thereof.
The base plate portion 2 is formed with a bolt hole 4 and a slit 5 penetrating the upper surface 2a and the lower surface 2b of the base plate portion 2. The bolt holes 4 and the slits 5 are arranged outside the pillar portion 1 so as to avoid the position of the pillar portion 1.
The slit 5 is formed so as to be separated from the bolt hole 4 and surround at least a part of the periphery of the bolt hole 4.

Anchor bolts 7 are embedded in the foundation 6. The upper end portion of the anchor bolt 7 protrudes from the upper surface of the foundation 6 and is inserted into the bolt hole 4 of the base plate portion 2. Then, the nut 8 is tightened to the portion of the anchor bolt 7 protruding upward from the bolt hole 4 via a thick washer, and the base plate portion 2 and the pillar portion 1 are fixed to the foundation 6.

A piece member 9 for supporting the base plate portion 2 and an elastic member 10 are installed between the lower surface 2b of the base plate portion 2 and the upper surface of the foundation 6.
The piece material 9 is provided in the central portion of the base plate portion 2, and the elastic material 10 is installed so as to surround the outside of the piece material 9. That is, the base plate portion 2 is fixed on the foundation 6 via the piece member 9 and the elastic member 10 around the piece member 9.
The elastic material 10 is made of foamed plastic having a closed cell structure, and has cushioning properties and water-stopping properties. As the foamed plastic, for example, polyurethane foam or polystyrene foam may be used.

The lower part of the pillar portion 1 and the brace portion 3 and the base plate portion 2 are covered with concrete 11 which is a covering material. The concrete 11 is cast on the foundation 6 to form a slab.
An edge cutting material 12 for the base plate is installed between the upper surface 2a of the base plate portion 2 and the concrete 11. The edge cutting material 12 for the base plate is installed between the upper surface 2a of the base plate portion 2 excluding the portion surrounded by the slit 5 and the concrete 11.
Further, the edge cutting material 13 for the pillar is installed between the lower part of the outer peripheral surface of the pillar portion 1 and the concrete 11.
The edge cutting material 12 for the base plate and the edge cutting material 13 for the pillar are plates made of a foamed resin having a closed cell structure, and have cushioning properties and water stopping properties.
The edge cutting member 12 for the base plate and the edge cutting member 13 for the pillar may be separate bodies or may be integrated.

As shown in FIG. 3, the brace portion 3 has a brace member 14 and a gusset plate 15 attached to an end portion of the brace member 14.
In the present embodiment, the brace member 14 is made of flat steel and is attached to the gusset plate 15 via fixtures 16 such as torque control bolts, high tension bolts, and rivets.
The gusset plate 15 is made of a steel plate, and the lower end surface 15a and the outer end surface 15b are orthogonal to each other. The outer end surface 15b of the gusset plate 15 is joined to the lower part of the outer peripheral surface of the pillar portion 1, and the lower end surface 15a is joined to the upper surface 2a of the base plate portion 2.

As shown in FIGS. 1 and 2, a edging member 17 is installed between the brace portion 3 and the concrete 11. That is, in the portion buried in the concrete 11, the outer peripheral surface of the brace portion 3 excluding the outer end surface and the lower end surface joined to the pillar portion 1 and the base plate portion 2 is covered with the edge cutting material 17.
The edge cutting material 17 is made of a plate made of foamed plastic having a closed cell structure similar to the edge cutting material 12, the edge cutting material 13, and the elastic material 10, and has cushioning properties and water stopping properties.
Further, the edge cutting material 17 is coated with a resin to smooth the surface, and is attached to the brace portion 3 using a double-sided tape for a metal material.

The edge cutting material 17 includes an edge cutting material 17a for the inner end surface, an edge cutting material 17b for the side surface, and an edge cutting material 17c for the lid.
The edge cutting material 17a for the inner end face covers the inner end face of the gusset plate 15.

The side edge cutting material 17b covers the front and rear surfaces of the gusset plate 15.
A bracing member 14 is attached to the gusset plate 15 via a fixture 16, and the fixture 16 projects from the front and rear surfaces. Therefore, as shown in FIG. 4, a notch portion 18 corresponding to the attachment portion of the brace member 14 is formed from the upper end of the edge cutting member 17b for the side surface, and unevenness on the front and rear surfaces of the gusset plate 15 is avoided. ing.
Then, the edge cutting member 17c for the lid is attached to the outer surface of the edge cutting member 17b for the side surface to cover the notch portion 18.
If the thickness of the side edge cutting member 17b is thinner than the amount of protrusion from the front and rear surfaces of the gusset plate 15 to the tip of the fixture 16, two side edge cutting members 17b may be stacked.

As shown in FIG. 5, a waterproof material 19 is filled between the edge cutting member 17c for the lid and the brace portion 3 to fill the gap due to the formation of the notch portion 18.
The waterproof material 19 is a foamed plastic having an elastic closed cell structure such as polyurethane foam, and is injected in a liquid state to foam. Then, the waterproof material 19 expands after injection, and the gap between the edge cutting material 17c for the lid and the brace portion 3 can be reliably closed.

When a large bending moment is applied to the column portion 1 due to an earthquake or the like, the base plate portion 2 is rotationally deformed to allow the bending moment. At this time, since the slit 5 is formed in the base plate portion 2, the base plate portion 2 is easily deformed and the rotation is not hindered.
At this time, since the elastic material 10 between the lower surface 2b of the base plate portion 2 and the foundation 6 is crushed, the rotation is not hindered. Further, an edge cutting material 12 for a base plate having a cushioning property is interposed between the upper surface 2a of the base plate portion 2 and the concrete 11, and a cushioning property is provided between the lower outer peripheral surface of the pillar portion 1 and the concrete 11. Since the edge cutting member 13 for the pillar is interposed and the first edge cutting member 12 and the second edge cutting member 13 are crushed, the rotation of the column portion 1 is not hindered.

When the pillar portion 1 and the base plate portion 2 rotate, the brace portion 3 joined to the lower part of the outer peripheral surface of the pillar portion 1 and the upper surface of the base plate portion 2 also rotates.
When the brace portion 3 rotates in parallel with the surface including the brace portion 3 (clockwise in FIG. 1), the edge cutting member 17a for the inner end surface is crushed and the rotation is not hindered.
When the brace portion 3 rotates in the direction intersecting the surface including the brace portion 3 (in the vertical direction in FIG. 5), the edge cutting material 17b for the side surface and the edge cutting material 17c for the lid are crushed, and the rotation is not hindered.
When the bending moment ceases to act, the elastic material 10, the first edge cutting material 12, the second edge cutting material 13, and the edge cutting material 17 return to their original shapes.

According to such a structure, even if a bending moment acts on the column portion 1, the concrete 11 does not crack not only around the column portion 1 and the base plate portion 2 but also around the brace portion 3. Therefore, the appearance of the concrete 11 is good, and water does not infiltrate due to cracks in the concrete 11.
Even if water tries to infiltrate through the gap between the concrete 11 and the outer peripheral surface of the brace portion 3, the edge cutting material 17 having water stopping property blocks the water, so that the waterproof property is high.

[Second Embodiment]
A second embodiment of the present invention will be described with reference to FIG. The description of the parts common to the first embodiment will be omitted.

The second embodiment is different from the first embodiment in that the brace member 14 is an angle member.
Since the brace member 14 made of an angle member has a flange 14a protruding at a right angle from the gusset plate 15, the surface of the flange 14a is covered with a flange cutting member 17d.
Therefore, even if the brace portion 3 rotates, it is possible to prevent the flange 14a from biting into the concrete 11 and cracking the concrete 11, and preventing the flange 14a from being deformed by the concrete 11.

[Third Embodiment]
A third embodiment of the present invention will be described with reference to FIG. The description of the parts common to the first and second embodiments will be omitted.

In the third embodiment, the edge cutting member 17e for the frame is attached to the outer surface of the edge cutting member 17b for the side surface along the peripheral edge of the notch portion 18 formed in the edge cutting member 17b for the side surface. The protruding height from the brace portion 3 (gusset plate 15) to the tip of the edge cutting member 17e for the frame is set to be slightly larger than the protruding height of the fixture 16.
Then, the edge cutting material 17c for the lid is attached to the tip surface of the edge cutting material 17e for the frame to cover the notch portion 18, and the waterproof material 19 is filled between the edge cutting material 17c for the lid and the brace portion 3. do.
The third embodiment is suitable when the amount of protrusion of the fixture 16 in the front-rear direction from the brace portion 3 is large.

[Fourth Embodiment]
A fourth embodiment of the present invention will be described with reference to FIG. The description of the parts common to the first to third embodiments will be omitted.

The fourth embodiment is different from the first embodiment in that a covering material is also arranged between the brace portion 3 and the edge cutting member 17.
The concrete 11 as a covering material includes a first covering portion 11a and a second covering portion 11b, and the first covering portion 11a covers the edge cutting material 17.
The second covering portion 11b is located on the brace portion 3 side of the first covering portion 11a and covers the brace portion 3, and the edge cutting material 17 is formed between the first covering portion 11a and the second covering portion 11b. is set up.

In the present embodiment, since the edge cutting member 17 is installed with a gap from the outer surface of the brace portion 3, it is fixed to the edge cutting member 17b for the side surface as in the first to third embodiments. It is not necessary to form a notch 18 for avoiding the tool 16 or to provide a lid edge cutting member 17c for closing the notch 18.

[Other Embodiments]
The present invention is not limited to the above embodiments. For example, the following are also included.

In the present embodiment, the base plate portion has slits, but the base plate portion may have no slits. Those without slits are effective against minute rotational deformation, although there is no positive rotational deformation.

In the present embodiment, the pillar portion is H-shaped, but the present invention is not limited to this, and a circular pipe, a square pipe, a groove shape, or the like can be used. Along with this, the shape of the base plate portion is also changed as appropriate.

In the present embodiment, the upper surface of the base plate portion, which is the base plate, and the lower end of the pillar portion, which is the pillar material, are joined, but the present invention is not limited to this. A projecting portion having the same cross-sectional shape as the pillar material may be provided on the upper surface of the base plate, and the lower end surface of the pillar material may be welded to the upper end surface of the projecting portion. In this case, the base plate corresponds to the base plate portion, and the protruding portion and the pillar material provided on the base plate correspond to the pillar portion.

In the present embodiment, both the edge cutting material for the base plate portion and the edge cutting material for the pillar portion are used, but either one may be used.

In the present embodiment, the piece material and the elastic material are installed between the base plate portion and the foundation, but a gap may be formed around the piece material without providing the elastic material. In this case, a closing plate may be erected from the foundation along the entire length of the outer peripheral edge of the base plate portion to block the inflow of concrete between the foundation and the base plate portion.

In the present embodiment, the gusset plate is attached to the end of the bracing material to form a brace portion, but the bracing material can be directly joined to the column portion and the base plate portion without using the gusset plate.

In the present embodiment, the edge cutting material is bonded to the brace portion via double-sided tape, but an adhesive may be used.

In the present embodiment, the brace portion is joined to the pillar portion and the base plate portion, but it may be joined to either the pillar portion or the base plate portion.

In the first to third embodiments, elastic foamed plastic is filled between the edge cutting material for the lid and the brace portion as a waterproof material, but since the edge cutting material for the lid has elasticity, It may be filled with non-elastic mortar or the like.

As the brace material, a flat steel material is used in the first embodiment and an angle material is used in the second embodiment, but other steel materials or turnbuckles can also be used.

In the fourth embodiment, the edge cutting material is installed between the first covering portion and the second covering portion, but since the fixture does not protrude from the inner end surface of the brace portion, the edge cutting material for the side surface is provided. Only the braces are installed at intervals from the front and rear surfaces of the brace portion, a second covering portion is provided between the edge cutting material for the side surface and the brace portion, and the edge cutting material for the inner end surface is on the inner end surface of the brace portion. It may be attached directly.

Each technical matter in any embodiment may be applied to other embodiments as an embodiment.

1 Pillar part 2 Base plate part 2a Upper surface 2b Lower surface 3 Brace part 4 Bolt hole 5 Slit 6 Foundation 7 Anchor bolt 8 Nut 9 Piece material 10 Elastic material 11 Concrete (covering material)
11a 1st covering 11b 2nd covering 12 Edge cutting material for base plate 13 Edge cutting material for columns 14 Bracing material 14a Flange 15 Gusset plate 16 Fixture 17 Edge cutting material 17a Edge cutting material for inner end face 17b For side surface Edge cutting material 17c Edge cutting material for lid 17d Edge cutting material for flange covering 17e Edge cutting material for frame 18 Notch 19 Waterproof material

Claims (9)

A column base structure including a column portion, a base plate portion provided at the lower end of the column portion, and a brace portion, and the base plate portion is fixed to the foundation via anchor bolts.
A column base structure characterized in that a lower portion of the brace portion is covered with a covering material, and an elastic edge cutting material is installed between the brace portion and the covering material. The column base structure according to claim 1, wherein the edge cutting material covers the lower portion of the outer peripheral surface of the brace portion. The brace portion has a brace material and a gusset plate attached to an end portion of the brace material, and the gusset plate is at least one of the lower part of the outer peripheral surface of the pillar portion and the upper surface of the base plate portion. The column base structure according to claim 2, wherein the edge cutting material is installed between the front / rear surface and the inner end surface of the brace portion and the covering material, which are joined to one side. The gusset plate is attached to the end of the brace through a fixture, and a side edge cutting material is formed on the front and rear surfaces of the gusset plate so as to have a notch corresponding to the attachment portion of the brace. The column base structure according to claim 3, wherein the edge cutting material for the lid that is joined and covers the notch portion is attached to the outer surface of the edge cutting material for the side surface. The column base structure according to claim 4, wherein a waterproof material is filled between the edge cutting material for the lid and the brace portion. A column portion, a base plate portion provided at the lower end of the column portion, and a brace portion are provided, and the base plate portion has a column base structure fixed to a foundation via anchor bolts.
The lower part of the brace portion is covered with a covering material, and the covering material includes a first covering portion and a second covering portion located on the brace portion side of the first covering portion.
A column base structure characterized in that an elastic edge cutting material is installed between the first covering portion and the second covering portion. The column base structure according to claim 6, wherein the edge cutting material is installed so as to surround the lower portion of the outer peripheral surface of the brace portion via the second covering portion. The brace portion has a brace material and a gusset plate attached to an end portion of the brace material, and the gusset plate is at least one of the lower part of the outer peripheral surface of the pillar portion and the upper surface of the base plate portion. It is joined to one side, the front-rear surface and the inner end surface of the brace portion are covered with the second coating portion, and the edge cutting material is installed between the first coating portion and the second coating portion. The column base structure according to claim 7, which is characterized. The column base structure according to any one of claims 1 to 8, wherein the edge cutting material has water blocking property.

Images