JP5319401B2 - Column base protection structure - Google Patents

Description

  The present invention relates to a column base protection structure for protecting a column base of a building. The present invention also relates to a protective cover molding used in such a column base protection structure.

  An exposed type column base is known as a column base structure that supports the superstructure of a building. The exposed-type column base includes a column base and a foundation that supports the column base, and the column base includes a column portion and an end plate provided at a lower end portion of the column portion, and the end plate It is the structure which supports by connecting a foundation with an anchor bolt.

  In such a construction method of the exposed column base, the end plate of the column base and the position that becomes the lower end of the outer wall of the upper structure of the column part are exposed as the column base exposed part. There is a case where construction is performed to cover the exposed portion of the column base by painting. The embedding work using the wet mortar largely depends on the skill of the operator, and there is a problem that it is difficult to stabilize the quality at the site. In addition, since wet mortar cannot require heat insulation performance, the column base exposed portion is substantially exposed to the outside air, and the column base exposed portion becomes a thermal bridge for the upper structure. There is also a problem. Furthermore, if the wet mortar is cracked due to aging or the like, rainwater or the like may enter from the crack, which may lead to corrosion of the exposed part of the column base. In order to avoid such a problem, it is conceivable that the exposed part of the column base is subjected to rust prevention treatment by resin coating, but there is a possibility that the resin coating and wet mortar may cause a chemical reaction, and such a configuration is easily adopted. I can't do it.

  By the way, in patent document 1, it forms with a fiber-type material with respect to the floor beam used as a thermal bridge by cutting with the edge of the heat insulation structure of a base part, and the heat insulation structure of an upper structure exposed to external air. The structure which winds the floor beam heat insulating material which is intended to solve the thermal bridge problem by this is disclosed, and it can be considered that such a structure is provided in the exposed part of the exposed column base.

JP 2008-150790 A

  However, in the configuration disclosed in Patent Document 1, since the floor beam heat insulating material is formed by covering the fiber-based heat insulating material with the moisture-proof and air-tight bag, it is necessary to process the moisture-proof and air-tight bag in view of dimensions and the like. Even when it is approached by the nature, there is a problem that it is impossible to process until the moisture-proof and air-tight bag is broken and the workability is lowered. In such a configuration, the moisture-proof and air-tight bag is wound around the floor beam in a state in which a tensile force is applied. There is a high risk that the bag itself will deteriorate due to exposure and the like, and the moisture-proof and airtight bag will be torn, and there is a problem that it is not suitable for long-term use. Moreover, since it attaches by the attachment method as mentioned above, the thick coating film for waterproofing cannot be formed on the surface of a bag, From this point, there also exists a problem that it is unsuitable for long-term durability. Moreover, in the unlikely event that the moisture-proof and air-tight bag is torn, as described above, a new problem arises in that the floor beam heat insulating material cannot be easily replaced.

Then, an object of this invention is to provide the column base protection structure which can ensure heat insulation while providing long-term durability, and can also aim at the improvement of workability.
Another object of the present invention is to provide a protective cover molded body that can provide long-term durability while ensuring heat insulation in the column base exposed portion, and can improve workability.

As a specific means for solving the above problems, the column base protection structure according to the present invention is:
(1) A column base exposed portion extending below the first floor portion in a state of being exposed to the outside without being covered by an outer wall portion or a first floor portion that partitions the interior and exterior of the upper structure, and the pillar And a base part that supports the leg exposed part, and a part or all of the column base exposed part has heat insulation and is formed into a removable block between the base part and the upper structure. The cover molding is covered.

  According to this, since the protective cover molded body is formed in a block shape in advance, the work of attaching the protective cover molded body to the column base exposed portion can be performed very easily, and the workability can be improved. Moreover, since it is formed as a block-shaped molded body in this way, it has sufficient strength as compared with the moisture-proof and air-tight bag, and has long-term durability. In addition, since the protective cover molded body has a heat insulating property, the thermal insulation of the column base exposed portion is ensured only by covering the column base exposed portion with the protective cover molded body. It can be suppressed.

(2) Moreover, it is preferable that the said protective cover molded object is provided with the outer cover part clamped by the said outer wall part and the said base part.
According to this, the protective cover molding can be attached to the column base exposed part on the foundation by inserting the protective cover molding between the foundation formed on the outer edge of the building and the outer wall. The workability can be improved.

(3) Moreover, it is preferable that the said protective cover molding is provided with the inner cover part clamped by the said 1st floor part and the said base part.
According to this, the protective cover molding can be attached to the column base exposed part on the foundation by inserting the protective cover molding between the foundation and the first floor, thereby improving the workability. Can be planned.

(4) Moreover, it is preferable that the said protective cover molded object is equipped with the foundation cover part which covers a part or all of the side surface of the said foundation part.
According to this, the heat insulation of a base part can also be improved.

  (5) In view of this point, the cover member is preferably formed of a foamed plastic material.

(6) Further, as another specific means for solving the above problems, the protective cover molded body according to the present invention is:
The column base exposed portion extending below the first floor in a state where it is exposed to the outside without being covered by the outer wall and the first floor which divides the interior and exterior of the upper structure supported by the foundation. It is characterized in that it is covered in part or in whole, has heat insulation properties, and is molded into a detachable block shape between the base portion and the upper structure.

  According to the present invention, it is possible to ensure heat insulation while providing long-term durability and to improve workability.

It is a whole sectional view of a two-story house in which the column base protection structure of the present invention is implemented. It is a side view which shows the reinforcement of a column base and the baseplate attachment state in which the column base protection structure of this invention is implemented. It is an enlarged side view which shows the state which has attached the protection cover molding to the column base from the outside air side. FIG. 4 is an enlarged plan view of the state of FIG. 3. It is an expanded side sectional view of the state of FIG. It is an enlarged side view which shows the state which attached the protective cover molding to the column base. FIG. 6 is an enlarged side sectional view similar to FIG. 5, showing a second embodiment of the column base protection structure of the present invention. It is an enlarged plan view of the state of FIG. It is an expanded sectional side view which shows 3rd Embodiment of the column base protection structure of this invention.

  Hereinafter, with reference to drawings, it explains in detail about the form which carried out the present invention to a two-story detached house.

<First Embodiment>
1 to 6 show a first embodiment of the present invention. A building in which a column base protection structure according to the present invention is implemented includes an upper structure 10 and a base structure 11 that supports the upper structure 10. It comprises.
The upper structure 10 includes a structural housing 12 assembled on the foundation structure 11, an outer wall 13 supported by the structural housing 12, a heat insulating layer 14 provided along the outer wall 13 and the structural housing 12, and a living room of the building. It is an assembly house on the second floor above ground that is formed with an interior structure 15 that forms a wall surface and a ceiling surface.
The structural frame 12 includes a steel column 16 standing on the foundation structure 11, a steel beam 17 spanned between the steel columns 16, and a floor slab 18 supported by the foundation structure 11 and the steel beam 17. It is configured as a steel frame structure formed in this way.

The steel column 16 is formed by a steel square pipe or by attaching a column head member or a column base member to an end portion of the square pipe.
The steel beam 17 is formed of a so-called H-shaped steel formed by including a pair of upper and lower flanges and a web that connects between the center portions of the upper and lower pair of flanges. The column 16 is connected and supported.
The connection between the steel column 16, the joint piece, and the steel beam 17 is made by mechanical means such as high-strength bolt joining, and as a result, welding joints can be eliminated regardless of the skill of the operator. Quality is constant.

  The floor slab 18 is formed by laying a plurality of flat paneled lightweight lightweight concrete (ALC) floor panels. The floor panel forming the first floor slab 18 is supported by the foundation structure 11 in a state where the end portion is placed on the upper surface of the foundation structure 11.

The outer wall 13 is formed by arranging and arranging a plurality of flat-walled lightweight cellular concrete (ALC) outer wall panels. Each outer wall panel has a height corresponding to at least the height of each floor from the lower surface of the floor slab 18 of each floor to the upper surface of the upper flange of the steel beam 17.
In addition, the outer wall panels on each floor are moved up and down on the steel beam 17 and the foundation structure 11 through various support hardware such as a self-weight bracket and a Inazuma plate attached to the steel beam 17 and the foundation structure 11 so as to protrude toward the outer wall panel. The end is supported.
As described above, the floor slab 18 and the outer wall 13 formed of lightweight cellular concrete are lightweight and have high heat insulation performance.

  In this embodiment, an outer wall panel made of lightweight cellular concrete is adopted as the outer wall 13, but a panel made of PC concrete, a wooden panel or a siding, and those having an exterior member attached thereto, etc. The outer wall 13 may be formed of any material as long as the thermal conductivity is higher than that of the steel column 16 so that the steel column 16 forms a thermal bridge relatively.

The foundation structure 11 is formed as a reinforced concrete cloth foundation that continues in the length direction of the outer wall 13 and the partition wall, and is adjacent to the column base 15 that supports the base end of the steel column 16 of the structural frame 12. And a foundation beam portion 20 that is formed continuously between the column base portions 19.
The foundation beam portion 20 is made of reinforced concrete and has a rectangular cross section that is larger than the beam width. The foundation beam portion 20 extends from one column base portion 19 to the other column base portion 19 in the same cross section. Yes.

The column base 19 includes a steel column base 21 connected to the steel column 16, a reinforced concrete base 22 supporting the column base 21, and the column base 21 fastened to the base 22. It is formed as a so-called exposed-type column base provided with anchor bolts 23 that perform.
The base portion 22 is provided with a beam width larger than that of the base beam portion 20, and is formed in a square shape in plan view formed so that the length in a direction perpendicular to the beam width is substantially the same as the beam width. Yes. Moreover, the upper surface is formed flat, and the column base part 21 is mounted on the upper surface.

Further, the base portion 22 and the base beam portion 20 have the same lower end surface, while the upper end surface is formed with the base portion 22 being lower (the upper end surface of the base beam portion 20 is the Z0 level of the building). (It is equal to the height position of the lower surface of the first floor slab 18 and the lower end position of the outer wall 13). As a result, an accommodating portion A for accommodating the column base 21 is provided at the upper part of the column base 19.
When an intermediate member such as a flat plate-like heat insulating material is provided between the foundation beam 20 and the first floor slab 18, the foundation beam 20 is lowered in height by the thickness of the intermediate member. Formed.

The column base portion 21 includes a base plate 21 a and a rising portion 21 b that rises from the base plate 21 a and is connected to the base end portion of the steel column 16. The base plate 21a is formed in a square plate shape in plan view, and has bolt holes at the four tops.
The anchor bolt 23 is fixed to the base portion 22 and provided with an upper end protruding from the upper surface of the base portion 22. By screwing the nut 23a in a state where the anchor bolt 23 is inserted into the bolt hole of the base plate 21a, the base plate 21a is fastened to the base portion 22 in a state of being placed on the upper surface of the base portion 22. ing. Further, mortar 22a is injected between the upper surface of the base portion 22 and the lower surface of the base plate 21a, so that slight unevenness of the base portion 22 is eliminated, thereby improving the installation property of the base plate 21a. Yes.

  In the foundation structure 11, a protective cover molded body 24 made of a foamed plastic block-shaped molded body is provided on the housing part A of the column base part 19 located on the outermost side from the outside air side. The protective cover molded body 24 is formed to be the same as or slightly larger than the height of the housing portion A, is fitted into the housing portion A from the outside air side, covers the column base portion 21 from the outside air side, and the housing portion A and the foundation beam portion 20. And the gap between the outer wall 13 and the outer wall 13 is filled.

  The protective cover molded body 24 includes a recess 24a for avoiding interference with the column base 21 of the steel column 16, and a notch 24b for avoiding interference with the base plate 21a and the anchor bolt 23, and is attached. Each side surface is provided so as to be flush with the side surface of the base portion 22, and when the protective cover molding 24 is attached, the column base 21 is not exposed from the outdoor side, and the inside and outside of the base in the housing portion A The gap that becomes the ventilation path is also filled.

  The foamed plastic used for the protective cover molded body 24 is not particularly limited as long as it has a predetermined heat insulating property and elasticity and can be used as a heat insulating material for buildings. For example, a beaded polystyrene having excellent moldability Examples thereof include foam heat insulating plates and polyethylene foams (for example, highly foamed polyethylene such as Sunnylite (trademark)). The protective cover molded body 24 is accommodated in the accommodating portion A from the outside air side and is fitted into the column base 21, but is formed to be slightly larger than the height of the accommodating portion A so as to be fitted into the accommodating portion A. Thus, the gap is pressed against the surrounding foundation beam portion 20, the foundation portion 22, and the outer wall 13, so that the gap is substantially eliminated and airtightness is ensured.

  Further, although not shown, after the protective cover molded body 24 is attached, a sealing material is appropriately injected into a gap that can be generated in order to ensure airtightness. A metal cover is attached to cover 22 or a weather resistant paint is applied.

Next, the construction method of the column base protection structure according to the first embodiment will be described.
In the construction of the foundation, after performing predetermined bar arrangement according to the foundation plan, the formwork is disposed, and the anchor bolt 23 is attached to the formation position of the column base part 19. Next, when concrete is placed from above the formwork corresponding to the foundation beam part 20, the placed concrete flows along the formwork and fills the foundation beam part 20 and the column base part 19; At this time, the level difference between the foundation beam portion 20 and the column base portion 19 is formed by a partition plate in which the lower edge is positioned at the level position of the column base portion 19. And if a formwork is removed after a predetermined curing period and a concrete foundation is exposed, it will be in the state where the anchor bolt 23 was fixed to the foundation part 22. FIG.

Thereafter, the level of the column base 19 is adjusted by placing mortar or the like on the top of the base 22 and a level plate is installed thereon. Next, the base plate 21a of the column base 21 is fixed to the anchor bolt 23, the column base 21 is erected, the steel column 16 is connected to the upper end of the column base 21, and the beam, floor, wall and superstructure 10 will be constructed.
When the housing construction for forming the upper structure 10 is completed, the protective cover molded body 24 is fitted into the housing portion A of the basic structure from the outside air side, and then a sealing material is injected into the gap, and the protective cover molded body 24 and A metal cover is attached so as to cover the lower base portion 22, or a weather resistant paint is applied simultaneously to the protective cover molding 24 and the base portion 22. As a result, the joint with the base portion 22 is eliminated, the appearance of the base portion 22 is improved and the appearance is improved, and the gap is also almost completely eliminated.

  In the column base protection structure having the above-described configuration, the column base is simply fitted into the outer wall 13 and the base portion 22 of the column base 21 from the outside by forming a protective cover molded body 24 which is formed in a block shape and has appropriate elasticity. Since the part 21 can be finished, the workability is improved. Further, the block-shaped protective cover molded body 24 not only has sufficient strength as compared with the conventional moisture-proof and air-tight bag, but the surface is covered with a sufficiently thick coating film or metal cover as described above. Therefore, it has long-term durability. Further, since the protective cover molded body 24 has heat insulation properties, the thermal insulation of the column base exposed portion is ensured only by covering the column base exposed portion with the protective cover molded body 24, whereby the column base exposed portion is secured. This will reduce the effects of thermal bridges.

Second Embodiment
FIGS. 7-8 shows 2nd Embodiment of this invention, and about the structure similar to 1st Embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.
In the second embodiment, the protective cover molded body (outer cover part) 24 is not only fitted from the outside air side to the housing part A of the column base part 21 but also from the indoor side. Part) 25 is fitted. That is, as can be seen from FIG. 8, a pair of protective cover moldings 25a in the shape of the protective cover molding 24 divided into two are fitted into the interior side of the column base 21 from the corners, and then a sealing material is injected into the gap. Is done.

In this embodiment, since the protective cover molded body 24 is not only fitted from the outside air side, but also the protective cover forming body 25 is fitted from the indoor side, the heat insulation performance is further improved.
In view of such an embodiment, the protective cover molding 25 can be attached not only to the outermost column base part 21 but also to the column base part of the middle column part, and the heat insulation performance is improved at a desired position. Can do.

<Third Embodiment>
FIG. 9 shows a third embodiment of the present invention, and the same components as those of the previous embodiment are denoted by the same reference numerals and description thereof is omitted.
In this embodiment, as in the case of the first embodiment, the protective cover molded body 24 closes the column base part 19, the column base part 21, and the accommodating part A below the outer wall 13 from the outside air side, and the second embodiment. The protective cover molding 26 is fitted from the inside in the same manner as in the above, but this protective cover molding 26 is provided with a hanging part (base cover part) 26a, and the column base part 19 and the column base part. 21 and the floor slab 18 are not only closed, but also cover the side surface of the column base 19 on the indoor side.
The column base 19 holds the column base 21 and the anchor bolt 23 connected to the steel column 16 that is positioned inside the heat insulating layer of the superstructure, the reinforcing bars are densely packed, and the anchor bolt 23 is likely to become a thermal bridge (a heat path inside and outside the room) because it is surrounded by reinforcing bars in the column base 19. Therefore, when the protective cover molded body 26 provided with the hanging portion 26a is used, heat is transferred around the protective cover forming body 24. In this case, the heat transfer path is lengthened, so that the heat insulation is further improved. As a result, such problems are solved.

As mentioned above, although the example which employ | adopted the column base protection structure which concerns on this invention for the outermost column base part was shown in the said embodiment, it can also be made to protect the column base part of a center column (inner column). . In addition, the shape and number of the protective cover moldings are arbitrary, and when combining a plurality, the protective cover moldings may be appropriately joined to each other with an adhesive or the like, or may be appropriately fastened to the floor slab, foundation, etc. You may fasten by.
In the above embodiment, the protective cover molded body is attached and then covered with a metal cover or weather-resistant paint is applied from above. However, the protective cover molded body itself is provided with a metal cover in advance. It may be left.
Moreover, it is also possible to employ | adopt the structure which provides the drooping part which protects the base part surface in the protective cover formation body pinched by the 1st floor outer wall and the base part.

DESCRIPTION OF SYMBOLS 10 Superstructure 11 Foundation structure 12 Structure frame 13 Outer wall 14 Thermal insulation layer 15 Interior structure 16 Steel column 17 Steel beam 18 Floor slab 19 Column base 20 Base beam 21 Column base 21a Base plate 21b Standing part 22 Base 22a Mortar 23 Anchor bolt 23a Nut 24 Protective cover molding (outer cover part)
24a Concave part 24b Notch part 25, 25a Protective cover molding (inner cover part)
26 Protective cover molding 26a Hanging part (foundation cover part)
A housing part

Claims (6)

  A column base exposed portion that extends downward from the first floor portion in a state of being exposed to the outside without being covered by an outer wall or a first floor portion that divides the interior and exterior of the superstructure, and the column base exposed portion And a part of or all of the exposed column bases having a heat insulating property and a protective cover molded body molded in a block shape that is detachable between the foundation and the upper structure. Column base protection structure characterized by covering.   The column base protection structure according to claim 1, wherein the protective cover molded body includes an outer cover portion sandwiched between the outer wall portion and the base portion.   The column base protection structure according to claim 1, wherein the protective cover molded body includes an inner cover portion that is sandwiched between the first floor portion and the base portion.   The column base protection structure according to any one of claims 1 to 3, wherein the protective cover molded body includes a base cover portion that covers a part or all of a side surface of the base portion.   The column base protection structure according to any one of claims 1 to 4, wherein the cover member is formed of a foamed plastic material.   The column base exposed portion extending below the first floor in a state where it is exposed to the outside without being covered by the outer wall and the first floor which divides the interior and exterior of the upper structure supported by the foundation. A protective cover molded body that covers a part or the whole, has heat insulation properties, and is molded into a detachable block shape between the base portion and the upper structure.

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