JP7249850B2 - Construction method of column base and column base - Google Patents

Description

TECHNICAL FIELD The present invention relates to a column base and a column base construction method, and more particularly to a column base having a column and a foundation for supporting the column and a construction method for the column base.

There is an exposed column base as a column base structure that supports the upper structure of a building. The exposed column base includes a steel column and a concrete column base supporting the column, and the column includes a base plate provided at the lower end of the column. The base plate and column base are supported by connecting them with anchor bolts. In general, the surroundings of the base plate and the anchor bolts are embedded with concrete or mortar (see Patent Document 1, for example).

JP-A-6-158818

In the conventional method of constructing exposed-type column bases, after foundation work for constructing continuous foundations and column base foundations is carried out, construction work for assembling column bases is carried out. Next, grouting is performed by injecting grout into the gap between the base plate of the pedestal and the pedestal foundation, and then foundation work is performed to bury the base plate and anchor bolts with concrete or mortar. Then, construction work is performed to assemble the outer walls of the first floor, and plastering work is performed to apply mortar, undercoat material, and topcoat material.

In the conventional construction method, after the erection work is performed to assemble the column base as described above, foundation work is performed again to cover the base plate of the column base with concrete or the like. Therefore, the order of construction and the arrangement of contractors became complicated, leading to increased costs and waiting time for construction.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a column base and a column base construction method that simplifies the construction procedure and facilitates fabrication. More specifically, the concrete covering the base plate and anchor bolts is made of a separate member, and foundation work is eliminated, thereby simplifying the construction procedure.

According to the column base of the present invention, a column supporting an outer wall, a foundation supporting the column, and a lower end portion of the column below the outer wall are provided at the lower end of the column, and anchor bolts are attached to the foundation. a column base cover member composed of a porous material, the base plate, and the base, covering the lower end of the column , the base plate, and the upper surface of the foundation, which are exposed below the outer wall; a grout retainer that prevents the grout from flowing out of the base plate when the grout is injected into the gap between the upper surface of the and a claw portion protruding outward in the pressing portion, and the column base cover member is fixed by press-fitting the claw portion.

According to the above configuration, by replacing the concrete or mortar that has conventionally been provided to cover the base plate or the like with the column base cover member made of a porous material, concrete or the like can be placed after the construction work. There is no need to repeat the foundation work. A footnote cover member composed of a porous material can be installed, for example, by cladding after the exterior walls have been installed. Therefore, the construction procedure is simplified, and a column base that is easy to manufacture can be provided.
In addition, by providing a grout retainer around the base plate, it is possible to carry out grouting work after assembling the base of the column in construction work, for example. Therefore, it is possible to continue to install the outer wall by the construction contractor, thereby preventing the waiting state of the construction work.
Further, the column base cover member is fixed by being engaged with the claw portion of the grout holder, so that the column base cover member can be easily fixed around the lower end portion of the column portion.

Further, in the pedestal described above, it is preferable that the pedestal cover member is made of a material made of expanded polystyrene (EPS).
By constructing the pedestal cover member from a accessory made of expanded polystyrene, the pedestal cover member is lightened, and the pedestal can be easily manufactured. Moreover, the curing period can be omitted, and the construction period can be shortened.

Moreover, in the above column base, it is preferable that a fireproof covering material is provided between the periphery of the lower end portion of the column portion and the column base cover member.
By providing a fire-resistant coating material around the lower end of the column base, it is possible to maintain fire-resistant performance while providing a footnote cover member made of a porous material.

Further, in the above-described pedestal, it is preferable that the claw portion is formed by bending a part of the pressing portion outward, and the pedestal cover member clamps the bent claw portion .

Further, in the above column base, the grout retainer has a support portion that supports the retainer portion, and a sealing material provided on the back surface of the support portion, and the grout retainer includes the sealing material It is preferable that the column base cover member is attached to the upper surface of the foundation by and covers the upper surface of the support part .

According to the method for constructing a column base of the present invention, a column supporting a foundation and an outer wall is provided, a base plate is connected to the foundation by an anchor bolt at the lower end of the column, and the lower surface of the base plate and the top surface of the foundation; installing an outer wall; and a step of applying mortar to the outer surface of the column pedestal cover member to apply a primer coating material and a top coating material . In the step of attaching the pillar cover member, the grout is The problem is solved by fixing the pedestal cover member by press-fitting a claw portion protruding outward, which is provided on a grout retainer that prevents the grout from flowing out of the base plate, into the pedestal cover member. .

In the above construction method for column bases, concrete or mortar, which was conventionally provided to cover the base plate, etc., is replaced with a column base cover member made of a porous material. There is no need to re-implement the foundation work to be installed. A footnote cover member composed of a porous material can be installed, for example, by cladding after the exterior walls have been installed. The construction procedure is simplified and the fabrication of the column base is facilitated.
In addition, by providing a grout retainer around the base plate, it is possible to carry out grouting work after assembling the base of the column in construction work, for example. Therefore, it is possible to continue to install the outer wall by the construction contractor, thereby preventing the waiting state of the construction work.
Further, the column base cover member is fixed by being engaged with the claw portion of the grout holder, so that the column base cover member can be easily fixed around the lower end portion of the column portion.

According to the column base of the present invention, since the column base cover member made of a porous material is provided instead of the conventional concrete or mortar that covers the base plate, etc., the foundation work for placing concrete after the construction work is eliminated. No need to do it again. A footnote cover member composed of a porous material can be installed, for example, by cladding after the exterior walls have been installed. Therefore, the construction procedure is simplified, and a column base that is easy to manufacture can be provided.

It is a figure which shows the column base in the state which attached the column part to the column base (foundation), (a) is a perspective view which shows an external corner part, (b) is a perspective view which shows an intermediate part. FIG. 4 is a diagram showing the column base of the present embodiment in a state after construction to which EPS accessory (column base cover member) etc. is attached, (a) is a perspective view showing an external corner portion, and (b) shows an intermediate portion. It is a perspective view. It is a flowchart which shows the construction procedure of a column base. It is sectional drawing along the IV-IV line of FIG. 2 which shows the column base after construction to which EPS accessory etc. were attached. It is a figure which shows the state which attached the grout presser around the base plate of a column base, (a) is a perspective view which shows an external corner part, (b) is a perspective view which shows an intermediate part. It is a figure which shows a grout presser, (a) is the perspective view seen from diagonally downward, (b) is the perspective view seen from diagonally upward. It is a figure which shows the state which attached rock wool (refractory covering material) to the column part, (a) is a perspective view which shows an external corner part, (b) is a top view of an external corner part. It is a figure which shows the state which attached rock wool to the column part, (a) is a perspective view which shows an intermediate part, (b) is a top view of an intermediate part. It is a figure which shows the column base of the state which attached the EPS accessories, (a) is a perspective view which shows an external corner part, (b) is a top view of an external corner part. It is a figure which shows the column base of the state which attached EPS accessory, (a) is a perspective view which shows an intermediate part, (b) is a top view of an intermediate part. FIG. 4 is a diagram showing a state in which a special mortar is applied to the outer surface of the EPS accessory and a glass mesh is laid, and (a) is a perspective view showing an external corner portion, and (b) is a perspective view showing an intermediate portion. is.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a column base having a column part, a foundation for supporting the column part, and a method for constructing the column base.
Below, the construction method of the pedestal and the pedestal according to the embodiment of the present invention will be described.

In addition, the embodiment shown below is for facilitating understanding of the present invention, and does not limit the present invention.
In other words, the present invention can be modified and improved without departing from its gist, and of course includes combinations of features according to each embodiment and modifications, and equivalents thereof. . Each member shown in each drawing is shown for the convenience of explanation, and the specific implementation form related to the shape, size, thickness, etc. is not limited to the same one. , including different ones.

First, column bases 1A and 1B according to the present embodiment will be described with reference to FIGS. 1 to 4. FIG. FIG. 1 is a diagram showing pedestals 1A and 1B with pillars 12 provided on a pedestal base 11 (foundation), and FIG. 1(a) shows pedestal 1A provided at an external corner. A perspective view, and FIG. 1(b) is a perspective view showing a column base 1B provided in the intermediate portion. FIG. 2 is a diagram showing the post-construction column base 1A with the EPS accessories 20 and the like attached to the lower end of the column portion 12. FIG. , and FIG. 2(b) is a perspective view showing a column base 1B provided in the intermediate portion. FIG. 3 is a flowchart showing the construction procedure of the column base of this embodiment. FIG. 4 is a diagram showing the configuration of the column base 1B, and is a cross-sectional view taken along line IV-IV in FIG. 2(b).

As shown in FIGS. 1(a) and 1(b), the foundation structure 2 is formed as a continuous foundation made of reinforced concrete that extends in the length direction of the outer wall 3 and the partition walls. The foundation structure 2 includes column bases 1A and 1B that support the end portions of the steel columns of the structural frame, and a foundation beam portion 5 that is continuously formed between adjacent column base portions (not shown). . The foundation beam portion 5 is made of reinforced concrete and extends from one column base 1A, 1B to the other column base with the same cross section.

The column bases 1A and 1B are provided with column base bodies 10A and 10B each having a column portion 12 connected to a steel frame column and a reinforced concrete column base 11 (foundation) supporting the column portion 12, and are so-called exposed columns. formed as legs.
The column base 11 is provided with a width in the thickness direction larger than that of the foundation beam 5 and a length in a height direction perpendicular to the width direction smaller than the beam height of the foundation beam 5. formed. The column base 11 is formed in a square columnar shape in a plan view, and has a flat upper surface on which a column portion 12 is placed.

As shown in FIGS. 1( a ) and 1 ( b ), the top surface of the column base 11 is formed to be lower than the top surface of the foundation beam portion 5 . As a result, storage spaces for installing the base plate 13 and the like are formed in the column bases 1A and 1B.

A base plate 13 formed in a flat plate shape having a square shape in plan view is provided at the lower end portion of the column portion 12 of the column bases 1A and 1B. Four corners of the base plate 13 are formed with bolt holes through which the anchor bolts 14 are passed. The anchor bolt 14 is fixed to the pedestal foundation 11 and has an upper end protruding from the upper surface of the pedestal foundation 11 . The base plate 13 is fastened to the column base 11 by screwing nuts while the anchor bolts 14 are passed through the bolt holes of the base plate 13 .

The column bases 1A and 1B of this embodiment are changed from the state shown in FIGS. The EPS accessories 20 and the like are provided around the lower ends of the pillars 12 of the pillar bases 10A and 10B by exterior work, and the undercoat material 27 and the topcoat material 28 are applied to complete the construction. FIG. 3 shows the procedure for constructing the column bases 1A and 1B. Moreover, the structure of the column base 1B is shown in FIG.

In the foundation work, the foundation beam portion 5 and the column base foundation 11 of the foundation structure 2 are constructed by the foundation work (S101). After that, in the construction work, the column section 12 is installed on the column base 11 by the construction worker. At this time, the grout 15 is injected into the lower surface of the base plate 13 and the upper surface of the column base 11 by a construction worker (S102). By injecting the grout 15 , the gap between the column portion 12 and the pedestal foundation 11 is filled, and the load is transmitted to the pedestal foundation 11 .

After the grouting is completed, the exterior walls 3 and the like are subsequently installed by the construction workers (S103). After the exterior walls 3 and the like are installed, a carpenter installs EPS (Expanded Poly-Styrene) accessories 20 (column base cover members) and ventilation cutouts, etc. on the column bases 10A and 10B during exterior construction ( S104).
After the EPS accessory 20 is attached, the plasterer applies mortar 25 and coats the column base 11, foundation beam 5, etc. with undercoat material 27 and topcoat material 28 (S105).
Conventionally, after the installation of the pillars 12 (S102) and before the installation of the outer walls (S103), the periphery of the lower ends of the pillars 12 of the pillar bases 10A and 10B was covered with concrete by foundation work. Therefore, after the foundation work (S101) is completed, a contractor is arranged to perform the foundation work. In the pedestals 1A and 1B of the present embodiment, the EPS accessories 20 made of a porous material are attached to the pedestal body 10A by exterior work (S104), thereby covering the lower ends of the pillars 12 and the like. . Therefore, the construction steps (S102 to S103) can be performed continuously, and the order of construction can be simplified. In addition, although a curing period was required when covering with concrete, the use of the EPS accessories 20 eliminates the curing period and shortens the construction period.

Next, details of the steps will be described with reference to FIGS. 4 to 9. FIG.

5(a) and 5(b) show a state in which a grout retainer 16 is attached to inject the grout 15 between the lower surface of the base plate 13 and the upper surface of the column base 11. FIG. Also, the grout retainer 16 is shown in FIGS. 6(a) and 6(b). The grout retainer 16 is a member made by bending a steel plate with a thickness of about 1.0 mm. The grout retainer 16 is composed of a retainer portion 17 provided around the base plate 13 and a support portion 18 that supports the retainer portion 17 . A butyl tape 17b is attached to the back surface of the pressing portion 17 corresponding to the thickness of the base plate (approximately 28 mm) so that the grout 15 does not leak when the grout 15 is injected. The pressing portion 17 is attached around the base plate 13 with a butyl tape 17b. A foam sealing material 18 a with butyl tape (for example, a sealing material made by attaching an adhesive sheet to an EPDM (ethylene propylene diene rubber) foam) is attached to the back surface of the support portion 18 , and is attached to the upper surface of the column base 11 . can be attached. A grout retainer 16 is attached around the base plate 13 in consideration of airtightness, and the grout 15 is injected from a through hole (not shown) formed in the upper surface of the base plate 13 .

A pressing portion 17 of the grout pressing member 16 is provided with a claw portion 17a formed by bending a part thereof outward when the pressing portion 17 is arranged around the base plate 13 . The claw portion 17a is engaged with the EPS accessory 20 when attaching the EPS accessory 20, which will be described later. performance is preserved.

After the grout 15 is injected, the outer walls 3 and the like are installed. After that, rock wool 19A, 19B as a fireproof covering material is provided on the lower end of the column 12 by a carpenter. 7(a) to 8(b) show the state in which rock wool 19A and 19B are attached. A part of the outer wall 3 is omitted to show the rock wool 19A, 19B. As shown in FIGS. 7(a) and 7(b), rock wool 19A is arranged below the outer wall 3 and at the lower end of the column 12 at the external corner so as to cover the entire side surface. As shown in FIGS. 8(a) and 8(b), rock wool 19B is arranged at the intermediate portion so as to cover the entire side surface below the outer wall 3 at the lower end portion of the column portion 12 . The rock wool 19A at the external corner may be arranged in an L shape in a plan view so as to cover the side surface exposed to the outside of the building. Also, the rock wool 19B in the intermediate portion may be arranged in a U shape in plan view so as to cover the side surface exposed to the outside of the building. Although the rock wool 19A and 19B is used as the fireproof covering material in this embodiment, the present invention is not limited to this, and a noncombustible material such as a gypsum board or a calcium silicate board may be used.

After the rock wools 19A and 19B are arranged, the accessory (EPS accessory 20) made of expanded polystyrene (EPS) is installed. Incidentally, the EPS accessories 20, which are column base cover members, are replaced by conventional concrete additions. The EPS accessory 20 is composed of an L-shaped EPS accessory main body 21 in a plan view and an auxiliary member 22 for filling a gap between the EPS accessory main body 21 and the base beam portion 5 when the EPS accessory main body 21 is attached. The EPS accessory main body 21 has a base plate covering portion 21a covering the base plate 13, a column covering portion 21b in contact with the rock wool 19A and 19B, and an inclined portion 21c connecting the base plate covering portion 21a and the column covering portion 21b. .

As shown in FIGS. 9(a) and 9(b), in the outside corner, the EPS accessory main body 21 is provided at the top of the outside corner facing the outside of the building and at two places near the foundation on the left and right of the corner. placed. The EPS accessory main body 21 is not arranged in the portion facing the inside of the building.
In addition, as shown in FIGS. 10(a) and 10(b), in the intermediate part, the EPS accessory main body 21 is arranged at each of the two positions near the foundation facing the outside of the building. As with outside corners, they are not placed at the foundation edge facing the inside of the building. An auxiliary member 22 is inserted into the gap between the base and the base.
By using the L-shaped EPS accessory main body 21 from a single mold, it is possible to deal with both the external corner portion and the intermediate portion. By producing a large number of EPS accessory main bodies 21 at a factory, the cost can be reduced as compared with individually producing them on site.
Note that the EPS accessory main body 21 and the auxiliary member 22 may be integrally formed in advance.
Further, the EPS accessory 20 is fixed to the column base 11 and the base plate 13 by being engaged with the urethane resin bond and the claw portion 17a of the grout retainer 16 described above. In the present embodiment, the claw portion 17a is press-fitted into the EPS accessory 20, and more specifically, is fixed by piercing it, but this is an example, and the claw portion 17a may be clamped and fixed.
After the EPS accessory 20 is arranged and fixed, exterior members such as a ventilation partition 24 are attached to the outer wall 3 by a carpenter.

After attaching the EPS accessory 20, plastering work is performed by a plasterer. Since the EPS accessory 20 is easily damaged when exposed, mortar 25 is applied to the outer surface of the EPS accessory 20 for the purpose of improving impact resistance. It is desirable that the mortar 25 be a dedicated product. Also, the mortar 25 is applied to a predetermined distance (approximately 5 cm) below the EPS accessory 20 to eliminate the step with the column base 11 and make it flush. Also, the mortar 25 is used to fill the gap with the foundation beam portion 5 .

After the mortar 25 is applied, an alkali-resistant glass mesh 26 is affixed, and after laying, a soldering iron is applied. After the mortar 25 is slightly tightened (after about 1 to 3 hours), the mortar 25 is applied again to the outer surface of the EPS accessory 20 so as not to create trowel waves.

After the mortar 25 has dried (for example, after 16 hours or more have passed since construction), the column base 11, the EPS accessory 20, and the outer surface of the foundation beam 5 are primed as shown in FIGS. 2(a) and 2(b). The material 27 is applied with a VP roller or the like. As the undercoat material 27, for example, one containing a sealless color aggregate may be applied.
After the undercoat material 27 is dried (for example, after 3 hours or more have passed since the application of the undercoat material 27), the topcoat material 28 is applied to the column base 11, the EPS accessory 20, and the foundation beam 5 using a mastic roller or the like. apply.

As described above, the column base and the method for constructing the column base according to the present embodiment have been described with reference to the drawings. In the embodiment, the EPS accessory 20 made of a porous material is used as the column base cover member, but the porous material is not limited to expanded polystyrene, and may be hollow carbon fiber or porous stone material.

1A, 1B column base 2 foundation structure 5 foundation beam portion 10A, 10B column base body 11 column base foundation (foundation)
12 Column Part 13 Base Plate 14 Anchor Bolt 15 Grout 16 Grout Presser 17 Presser Part 17a Claw Part 17b Butyl Tape 18 Supporting Part 18a Foamed Sealing Material 19A, 19B Rock Wool 20 EPS Accessory (Column Base Cover Member)
21 EPS Accessory Main Body 21a Base Plate Covering Part 21b Column Covering Part 21c Inclined Part 22 Auxiliary Member 24 Ventilation Cutoff 25 Mortar 26 Glass Mesh 27 Undercoat Material 28 Topcoat Material

Claims (6)

a pillar supporting the outer wall; a foundation supporting the pillar;
a base plate provided at the lower end of the pillar below the outer wall and connected to the foundation by anchor bolts;
a column base cover member made of a porous material that covers the lower end of the column, the base plate, and the upper surface of the foundation exposed below the outer wall;
a grout retainer that prevents the grout from flowing out of the base plate when the grout is injected into the gap between the base plate and the upper surface of the foundation;
The grout retainer has a retainer portion provided around the base plate and a claw portion protruding outward from the retainer portion,
The column base, wherein the column base cover member is fixed by press-fitting the claw portion . 2. The pedestal according to claim 1, wherein the pedestal cover member is made of a material made of expanded polystyrene (EPS). 3. The pedestal according to claim 1, wherein a fireproof covering material is provided between the periphery of the lower end of the pillar and the pedestal cover member. The claw portion is formed by bending a portion of the pressing portion outward,
The pedestal according to any one of claims 1 to 3, wherein the pedestal cover member clamps the bent claw portion. The grout presser has a support portion that supports the presser portion, and a sealing material provided on the back surface of the support portion,
The grout retainer is attached to the upper surface of the foundation by the sealing material,
The pedestal according to any one of claims 1 to 4, wherein the pedestal cover member covers an upper surface of the support portion. A step of providing a column for supporting a foundation and an outer wall, connecting a base plate to the foundation with an anchor bolt at the lower end of the column, and injecting grout into a gap between the lower surface of the base plate and the upper surface of the foundation;
installing an outer wall;
A step of attaching a column base cover member made of a porous material to cover the lower end of the column, the base plate, and the upper surface of the foundation;
a step of applying mortar to the outer surface of the column base cover member and applying the undercoat material and the topcoat material ;
In the step of attaching the pedestal cover member, by press-fitting a claw portion that is provided on a grout retainer that prevents the grout from flowing out of the base plate and protrudes outward into the pedestal cover member, A method for constructing a pedestal, comprising fixing the pedestal cover member .

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