JP7424824B2 - Formwork for building column bases and method of assembling formwork for building column bases - Google Patents

Description

The present disclosure relates to a formwork for a column base of a building and a method for assembling the same, which is used when forming a connection support layer for a column base that connects a building foundation and a steel frame column. In particular, the present disclosure relates to a formwork for a pillar base of a building that is easy to assemble and prevents filler from leaking, and a method for assembling the same.

Grout formwork for column bases is installed at the lower end of the steel column with the upper end of the anchor bolt buried in the foundation concrete protruding above the ground in order to transmit the stress of the building to the foundation via the steel column. It is connected to the base plate. In addition, since the top surface of the foundation concrete cast on site tends to be uneven and uneven, a certain gap should be created in advance between the bottom surface of the base plate and formwork should be installed around the outside of this gap to fill the grout. By filling, a connecting support layer is provided that maintains the lower surface of the base plate at a horizontal level and brings it into close contact with the upper surface of the foundation concrete (for example, Patent Document 1).

Japanese Patent Application Publication No. 2008-196121

In the grouting formwork for column bases described in Patent Document 1, a formwork main body is formed in a desired form shape by connecting the ends of band-shaped formwork materials cut to a regular length, and the grouting formwork is placed at a suitable place on the outside of the formwork main body. It is fixed on the foundation concrete by driving a locking member from the outside of the formwork attachment part that overlaps with the provided band-shaped formwork material. Since the joint surface between the ends of each band-shaped formwork material is one side, it was necessary to assemble the formwork while being careful not to move the band-shaped formwork material. Further, there was a problem in that the filled grout material easily leaked from between the ends of the band-shaped formwork material.

In view of these problems, an object of the present invention is to provide a formwork for a pillar base of a building that is easy to assemble and prevents filling material from leaking.

At least some embodiments of the invention include a four-sided side wall (9) surrounding the column pedestal, and an upper portion (42) extending from the upper edge of each of said side walls and bending relative to said side wall. a lower flange (11) extending outwardly from the lower edge of each of said side walls; frame members (13, 23, 41), each of the pair of formwork members comprising a central piece (14) forming one of the side walls and a long piece extending from one end of the central piece; (15) and a short piece (16) extending from the other end of the central piece in the same direction as the long piece, and the long piece of one formwork member is connected to the inner surface of the short piece of the other formwork member. The long piece of the other formwork member hits the inner surface of the one formwork member along the inner surface of the short piece of the one formwork member. It's good to win.

According to this configuration, the formwork members are less likely to shift from each other, making it easy to assemble the formwork. Furthermore, the filling material is less likely to leak from the joints between the formwork members.

In at least some embodiments of the present invention, in the above structure, each of the pair of formwork members is a rectangular sheet metal that is bent to form the central piece, the long piece, and the short piece. The upper and lower parts of the sheet metal are provided with slits (20) or cutouts (20) corresponding to the parts of the upper part and the lower flange that should constitute the corners between the four sides of the side wall. 21), and the sheet metal is preferably bent to form the upper part and the lower flange.

According to this configuration, since each form member is formed from one sheet metal, assembly of each form member is simplified.

In at least some embodiments of the invention, the upper portion may include an upper flange (10, 24) extending inwardly or outwardly from a top edge portion of each of the sidewalls.

According to this configuration, another formwork member can be attached on the upper flange of one formwork member.

In at least some embodiments of the invention, the upper portion may extend downwardly from an upper edge of each of the side walls along an outer surface of the side walls.

According to this configuration, the side wall and the upper portion overlap, and the rigidity of each formwork member can be increased.

At least some embodiments of the invention include a pair of formworks in the first or second configuration, wherein the upper flange of at least one of the formworks extends outwardly; It is preferable that the long frame (32) is formed by vertically attaching the top surface of the upper flange of the formwork and the bottom surface of the lower flange of the other formwork so as to overlap.

According to this configuration, different molds of different heights can be realized using fewer types of mold members.

At least some embodiments of the present invention provide a method for assembling a formwork for a pillar base of a building in the first configuration, the method comprising: preparing a rectangular sheet metal for forming the formwork member; bending the sheet metal to form the upper portion and the lower flange; and forming corners between the four sides of the side walls of the upper portion and the lower flange at the upper and lower portions of the sheet metal; a step of providing slits or notches corresponding to the portions to be formed; a step of bending the side wall to form the central piece, the long piece and the short piece; The long piece of the one formwork member is brought into contact with the inner surface of the other formwork member along the inner surface of the short piece of the other formwork member so as to surround the column base, and the The method may include the step of abutting the long piece of the other formwork member against the inner surface of the one formwork member along the inner surface of the short piece of the one formwork member.

According to this configuration, it is possible to easily assemble a mold that prevents the filler from leaking from the joints between the mold members.

At least some embodiments of the present invention, in the above configuration, may further include the step of respectively joining the seams between the pair of formwork members.

According to this configuration, the long piece of one formwork member collides with the short piece of the other formwork member, and the long piece of the other formwork member collides with the short piece of one formwork member, respectively. , it is possible to prevent the filling material from leaking from the joints between the formwork members.

At least some embodiments of the invention, in any of the configurations described above, may further include the step of fixing each of the lower flanges of the formwork to foundation concrete (1).

According to this configuration, it is possible to prevent the formwork from shifting on the foundation concrete.

According to the present invention, it is possible to provide a formwork for a pillar base of a building that is easy to assemble and prevents filler from leaking.

A perspective view of a column base of a building to which the formwork according to the first embodiment is applied Enlarged sectional view of the column base in Figure 1 An enlarged sectional view of a column base of a building according to another example to which the formwork according to the first embodiment is applied A developed view of one formwork member of the formwork according to the first embodiment A perspective view of one formwork member of a formwork according to the second embodiment Exploded perspective view of a long frame according to the third embodiment A sectional view of a column base of a building to which the long frame according to the third embodiment is applied A perspective view of one formwork member of a formwork according to a fourth embodiment

<<First embodiment>>
Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view of a pillar base of a building. Anchor bolts 2 are buried in foundation concrete 1, which is the foundation of a building, and their upper ends protrude above the ground, and flange-shaped base plates 4 are installed on the lower ends of steel columns 3 that stand on the ground. They are connected by a fixing nut 5 that is screwed into the.

FIG. 2 is an enlarged sectional view of the column base of FIG. 1. The steel column 3 at the column base cannot be installed vertically if the top surface of the foundation concrete 1 is uneven and uneven, so there is a level between the top surface of the foundation concrete 1 and the bottom surface of the base plate 4. By raising the mortar 6, a certain gap is provided in advance. Formwork 7 (formwork for column bases) is installed around the outer periphery of the gap, filled with grout to form a connecting support layer 8, and the top surface of foundation concrete 1 is leveled to bring the bottom surface of base plate 4 to a horizontal level. The steel frame columns 3 are held vertically and erected, and the base plates 4 are connected to the steel columns 3 in close contact with the upper surface of the foundation concrete 1.

The formwork 7 is installed at a constant distance a from the outer periphery of the base plate 4, and a grout material such as non-shrinkage mortar can be filled into the formwork 7 through this distance a. Alternatively, as shown in FIG. 3, the mold 7 may be brought into contact with the outer periphery of the base plate 4, and the grout material may be filled into the mold 7 through an injection port 37 formed in the base plate 4. Furthermore, at the base of the column where the formwork 7 is arranged as shown in FIG. may be placed.

As shown in FIG. 1, the formwork 7 according to the first embodiment of the present invention has side walls 9 on four sides surrounding the column base, and extends from the upper edge of each of the side walls 9 and is bent with respect to the side walls. and a lower flange 11 extending horizontally outwardly from the lower edge of each of the side walls 9. In this embodiment, upper portion 42 is an upper flange 10 extending horizontally inward from the upper edge of each sidewall 9 . The formwork 7 is fixed to the foundation concrete 1 by locking means 12 such as nails driven into the four sides of the lower flange 11.

The formwork 7 has a pair of formwork members 13, each formed of a rectangular sheet metal. Each of the formwork members 13 includes a central piece 14 forming one of the side walls 9 of the formwork 7 , a long piece 15 extending substantially perpendicularly from one end of the central piece 14 , and a long piece 15 extending from the other end of the central piece 14 . It has a short piece 16 extending in the same direction as the piece 15. One of the long pieces 15 of the pair of formwork members 13 hits the inner surface of the other formwork member 13 along the inner surface of the other short piece 16 of the pair of formwork members 13, and the pair of molds The pair of formwork members 13 are arranged so that the other long piece 15 of the frame member 13 abuts against the inner surface of one of the formwork members 13 along the inner surface of one of the short pieces 16 of the pair of formwork members 13. 13 is connected. The seams between the formwork members 13 are joined by joining means 17 such as tape. The formwork member 13 may be manufactured from a flexible material, for example steel, which can be cut with a hand tool such as scissors.

FIG. 4 is a plan view of one of the formwork members 13 (sheet metal). The sheet metal is folded at sides 18 and 19 to form an upper flange 10 and a lower flange 11. In addition, slits 20 or approximately V-shaped notches 21 are formed in the upper and lower parts of the sheet metal so as to correspond to the portions of the upper flange 10 and lower flange 11 that should constitute the corners between the four sides of the side wall 9. will be provided. In this embodiment, the upper flange 10 is preferably provided with a notch 21 so that the work of bending the upper flange 10 inward is facilitated. A slit 20 is provided in the lower flange 11. The sheet metal is further bent at the portions that are to constitute the corners between the four sides of the side wall 9 so as to form the central piece 14, the long piece 15 and the short piece 16.

Because of this configuration, the formwork 7 according to this embodiment has the following advantages.

Each formwork member 13 is self-supporting due to the outward extension of the lower flange 11. Further, one of the long pieces 15 of the pair of formwork members 13 abuts against the inner surface of the other formwork member 13 along the inner surface of the other short piece 16 of the pair of formwork members 13, The other long piece 15 of the formwork member 13 hits the inner surface of one formwork member 13 along the inner surface of one of the short pieces 16 of the pair of formwork members 13, so that the pair of formwork members 13 The frame members 13 become difficult to shift from each other. Thereby, the pair of formwork members 13 can be easily joined using the joining means 17 such as tape. Furthermore, one long piece 15 and the other short piece 16 of the pair of formwork members 13 overlap and abut against each other, thereby making it difficult for the grout material to leak from the joint between the formwork members 13.

Further, since the lower flange 11 of each formwork member 13 extends outward in the horizontal direction, the formwork 7 can be fixed to the foundation concrete 1 by driving locking means 12 such as nails. becomes easier. Furthermore, the upper flange 10 increases the rigidity of the formwork 7. As a result, when the formwork 7 is filled with grout, the stress of the formwork 7 against the external force applied from the grout increases, and the formwork 7 becomes less likely to be distorted. Since the upper flange 10 extends in the horizontal direction, a reinforcing material or the like can be placed and fixed on the upper flange 10.

Moreover, the formwork 7 according to the first embodiment of the present invention can be assembled by the following procedure. First, one rectangular sheet metal for forming the frame member 13 is prepared. Next, the sheet metal is bent at a substantially right angle to form the upper flange 10 and the lower flange 11. Subsequently, slits 20 or cutouts 21 are provided in the upper and lower parts of the sheet metal so as to correspond to the portions of the upper flange 10 and the lower flange 11 that should constitute the corners between the four sides of the side wall 9. Thereafter, the side wall 9 is roughly shaped to form a central piece 14, a long piece 15 extending from one end of the central piece 14, and a short piece 16 extending from the other end of the central piece 14 in the same direction as the long piece 15. Fold it at a right angle. Next, one long piece 15 of the pair of formwork members 13 is attached to the inner surface of the other short piece 16 of the pair of formwork members 13 so that the pair of formwork members 13 surrounds the pillar base of the building. along the inner surface of the other formwork member 13, and the other long piece 15 of the pair of formwork members 13 is brought into contact with the inner surface of one of the short pieces 16 of the pair of formwork members 13, It is brought into contact with the inner surface of one formwork member 13. Thereafter, the joints between the pair of formwork members 13 are respectively joined. Finally, each lower flange 11 of each formwork member 13 is fixed to the foundation concrete 1.

<<Second embodiment>>
FIG. 5 is a perspective view of one of the formwork members 23 of the formwork 22 according to the second embodiment of the invention. The formwork 22 according to the present embodiment is different from the formwork 7 according to the first embodiment (see FIG. 1) in that the upper flange 24 (upper part 42) of each formwork member 23 extends outward. They differ in their orientation. In the description, the same reference numerals are given to the same components as in the first embodiment, and the description thereof will be omitted.

The upper flange 24 of the formwork member 23 extends horizontally outward. In this embodiment, similarly to the lower flange 11, the slits 20 may be provided to correspond to the portions of the upper flange 24 that should constitute the corners between the four sides of the side wall 9.

With this configuration, the formwork 22 according to the present embodiment can be assembled more easily because the process of providing the slits 20 in the sheet metal of each formwork member 23 is simplified.

<<Third Embodiment>>
FIG. 6 is an exploded perspective view of a long frame 32 formed by attaching two frames 22 (see FIG. 5) according to the second embodiment of the present invention one above the other. The long formwork 32 includes an upper formwork 32a and a lower formwork 32b having the same configuration as the upper formwork 32a. The upper formwork 32a and the lower formwork 32b each have the same configuration as the formwork 22 according to the second embodiment. In the description, the same components as those in the second embodiment are given the same reference numerals, and the description thereof will be omitted.

The long formwork 32 is assembled by arranging an upper formwork 32a and a lower formwork 32b one above the other. More specifically, the upper formwork 32a and the lower formwork 32b are connected to the bottom surfaces 33a, 33a of the lower flanges 11, 11 of the pair of formwork members 23, 23 of the upper formwork 32a, and the lower mold The pair of formwork members 23, 27b of the frame 27b are connected to the upper surfaces 34b, 34b of the upper flanges 24, 24 by locking means 35 driven into the four sides to form a long frame 32. do. It is preferable that the bottom surface 33a of the lower flange 11 of the upper formwork 32a and the upper surface 34b of the upper flange 24 of the lower formwork 32b have shapes that match when stacked vertically.

FIG. 7 is a sectional view of a column base of a building to which the long frame 32 of FIG. 4 is applied. In this embodiment, the long frame 32 surrounds the column base in order to form a concrete column 36 provided on the foundation concrete 1 to support the steel column 3 erected on the ground. It is arranged like this. The long formwork 32 is fixed to the foundation concrete 1 by locking means 12 such as nails driven into the four sides of the lower flange 11 of the lower formwork 32b. The anchor bolt 2 embedded in the column type 36 and protruding above the ground at the upper end side is connected to the base plate 4 provided at the lower end side of the steel column 3 by a fixing nut 5 screwed onto the anchor bolt 2. The connection support layer 8 may be formed between the upper surface of the column type 36 and the lower surface of the base plate 4 by filling a gap created by heaping up the level mortar 6 with grout material.

Because of this configuration, in this embodiment, the upper formwork 32a and the lower formwork 32b, each of which has the same configuration as the formwork 22 according to the second embodiment, are attached in a vertically stacked manner. A long frame 32 having a height can be formed. Therefore, long frames 32 having different heights can be realized using fewer types of frame members 23.

<<Fourth embodiment>>
FIG. 8 is a perspective view of one of the formwork members 41 of the formwork 40 according to the fourth embodiment of the present invention. The formwork 40 according to the present embodiment is different from the formwork 7 according to the first embodiment (see FIG. 1) in that the upper part 42 of each formwork member 41 is directed downward along the outer surface of the side wall 9. They differ in that they are extended. In the description, the same reference numerals are given to the same components as in the first embodiment, and the description thereof will be omitted.

The upper portion 42 of the formwork member 41 extends downward from the upper edge of each side wall 9 along the outer surface of the side wall 9 . In this embodiment, similarly to the lower flange 11, the slits 20 may be provided to correspond to the corners of the side wall 9 of the upper portion 42 between the four sides.

With this configuration, in the formwork 40 according to the present embodiment, the side walls 9 and the upper portions 42 of each formwork member 41 overlap, and the rigidity can be increased. Further, since the sheet metal is folded back at the upper end of the side wall 9, the upper end becomes rounded and dull, so that when a worker comes into contact with the formwork member 41, it is less likely that an operator will be injured.

Although the description of the specific embodiments has been completed above, the present invention is not limited to the above-mentioned embodiments and can be widely modified and implemented. For example, in the first embodiment and the second embodiment, in order to increase the bending strength of the formworks 7 and 22, the extending ends of the upper flanges 10 and 24 and the lower flange 11 of each formwork member 13 and 23 are bent. It may be doubled. Further, in the third embodiment, the upper formwork 32a of the long formwork 32 had the same configuration as the formwork 22 according to the second embodiment, but the upper formwork 32a had the same structure as the formwork 22 according to the first embodiment. It may have the same configuration as the formwork 7.

1: Foundation concrete
7: Formwork according to the first embodiment
9: Side wall 10, 24: Upper flange
11: Lower flange 13, 23, 41: Formwork member
14: Center piece
15: Long piece
16: Short piece
20: Slit
21: Notch
22: Formwork according to second embodiment
32: Long frame
40: Formwork according to the fourth embodiment
42: Upper part

Claims (7)

four side walls surrounding the column base; an upper portion extending from the upper edge of each of the side walls and bent with respect to the side wall; and a lower portion extending outward from the lower edge of each of the side walls; A formwork for a column base of a building having a flange,
The formwork has a pair of formwork members,
Each of the pair of formwork members includes a central piece forming one of the side walls, a long piece extending from one end of the central piece, and a long piece extending from the other end of the central piece in the same direction as the long piece. and an extending short piece;
The long piece of one formwork member abuts the inner surface of the other formwork member along the inner surface of the short piece of the other formwork member, and the long piece of the other formwork member abuts against the inner surface of the other formwork member. abutting against the inner surface of the one formwork member along the inner surface of the short piece of the frame member ;
Each of the pair of formwork members has a rectangular sheet metal bent to form the central piece, the long piece, and the short piece,
Slits or notches are provided in the upper and lower parts of the sheet metal so as to correspond to the parts of the upper part and the lower flange that should constitute the corners between the four sides of the side wall,
The formwork characterized in that the sheet metal is bent to form the upper portion and the lower flange . 2. The formwork of claim 1 , wherein the upper portion includes an upper flange extending inwardly or outwardly from the upper edge of each of the sidewalls. 2. The formwork of claim 1 , wherein the upper portion extends downwardly from an upper edge of each of the side walls along an outer surface of the side wall. A set of two formworks according to claim 2,
the upper flange of at least one of the formworks extends outwardly;
An elongated frame formed by attaching the top surface of the upper flange of one of the formworks and the bottom surface of the lower flange of the other formwork one above the other, one above the other. A method of assembling the formwork according to claim 1, comprising:
preparing a rectangular sheet metal for forming the formwork member;
bending the sheet metal to form the upper portion and the lower flange;
providing slits or notches in the upper and lower parts of the sheet metal so as to correspond to the portions of the upper portion and the lower flange that should constitute the corners between the four sides of the side wall;
bending the side walls to form the central piece, the long pieces and the short pieces;
The long piece of the one formwork member is moved along the inner surface of the short piece of the other formwork member so that the pair of formwork members surrounds the column base. abutting against the inner surface, and causing the long piece of the other formwork member to abut against the inner surface of the one formwork member along the inner surface of the short piece of the one formwork member. A method characterized by comprising: 6. The method of claim 5 , further comprising joining respective seams between the pair of formwork members. 7. A method according to claim 5 or 6 , further comprising the step of securing each of the lower flanges of the formwork to foundation concrete.

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