Baseboard material, wall lower structure and construction method thereof, column lower structure and construction method thereof

Abstract

To provide a baseboard material which can be constructed in a short construction period and does not require repair work.SOLUTION: A baseboard material disposed at a lower part of a wall or a column, the baseboard material having a flat plate shape with one side in a thickness direction being a front surface and the other side being a back surface, the baseboard material comprising: a vertical part extending in a vertical direction; a folded-back part extending perpendicularly from a lower end of the vertical part toward the back surface; and a separator hooking part disposed on the back surface of the vertical part.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a width timber, a structure of the lower part of a wall using the width timber and a construction method thereof, a structure of the lower part of a column and a construction method thereof.

Background Art

[0002] Generally, in a building, a width timber is provided at a location where the lower part of a wall or a column joins the floor in order to protect the lower part of the wall or the column and to beautifully finish the joint part. For example, when providing a partition wall in a factory, a warehouse, etc., the lower body of the partition wall is constructed of reinforced concrete, and the surface is finished with mortar to form a width timber part.

[0003] When constructing the lower body with reinforced concrete and finishing the surface with mortar to form a width timber part, the following steps are performed: (1) erection of formwork and reinforcement, (2) pouring of concrete between the formworks, (3) dismantling and removal of the formwork, and (4) plaster repair of the surface and chamfering of the lower part. In addition to the above steps, in a food factory, etc., a step of applying a high-strength and hygienic floor coating material (Yukurit (registered trademark)) to the floor and the width timber part, and a step of attaching a guard pipe for protecting the width timber part from a trolley, a forklift, etc. are performed.

[0004] In addition, Patent Document 1 describes a method of constructing the lower part of a partition wall by fixing a width timber mortar finishing production plate serving as a width timber to the floor surface so as to face each other and then filling concrete therebetween.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] In the conventional method of constructing the lower part of a wall with reinforced concrete and finishing the surface with mortar to form a sill part, there were the following problems. (1) The number of processes is large, adjustment between different trades is required, and the construction period becomes long. (2) Even after construction is completed, there was a risk of repair and maintenance due to peeling of the floor coating material applied to the sill part. (3) Repair work is essential for the lower body and the sill part, and there are variations in the degree of completion and appearance depending on the skill level of the workers.

[0007] Also, since the sill mortar finishing production plate used in the method described in Patent Document 1 is made of mortar, application of the above-mentioned coating agent and guard pipes are required.

[0008] An object of the present invention is to provide a sill material that can be constructed in a short construction period and does not require repair work, a structure of the lower part of a wall using the same and a construction method thereof, a structure of the lower part of a column and a construction method thereof.

Means for Solving the Problems

[0009] The first invention of the present application is a sill material disposed at the lower part of a wall or a column, which is in a flat plate shape with one side in the thickness direction as the front surface and the other side as the back surface, having a vertical portion extending in the vertical direction, a folded-back portion extending perpendicularly from the lower end of the vertical portion to the back surface side, and a separator hanging portion disposed on the back surface of the vertical portion. The second invention of the present application is characterized in that, in the sill material of the first invention, it has an inclined portion extending obliquely upward from the upper end of the vertical portion to the back surface side. The third invention of the present application is characterized in that, in the sill material of the first invention, it has a male tenon protruding laterally from the back surface side of one side end portion and a female tenon corresponding to the male tenon on the back surface side of the other end portion. The fourth invention of the present application is a structure at the lower part of a wall, which is made of concrete cast and cured between a pair of formworks erected opposite to each other. At least one of the pair of formworks is a width timber according to any one of the first to third inventions, and the other formwork of the pair of formworks has a separator with one end hooked to the other formwork and the other end hooked to the separator hooking portion of the width timber. The fifth invention of the present application is a method for constructing the structure of the lower part of the wall according to the fourth invention, in which a pair of formworks are erected opposite to each other, and concrete is cast and cured between the pair of formworks. In the step of erecting the pair of formworks opposite to each other, a long first crosspiece is fixed to the floor surface with a predetermined interval from the other formwork of the pair of formworks. The width timber, which is one of the pair of formworks, is arranged on the first crosspiece with the folded-back portion protruding toward the other formwork side from the upper surface of the first crosspiece. A long second crosspiece is fixed on the first crosspiece in contact with the surface side of the width timber. One end of the separator is hooked to the other formwork, and the other end is hooked to the separator hooking portion of the width timber. After the concrete is cast, the second crosspiece and the first crosspiece are removed. The sixth invention of the present application provides a structure at the lower part of a wall, which includes a width timber according to any one of the first to third inventions arranged at a predetermined interval from the surface of the wall panel and facing the back side of the wall panel, a retaining material with one end fixed to a retaining material anchor cast on the floor surface and the other end fixed to the separator hooking portion of the width timber, and concrete cast and cured between the wall panel and the back side of the width timber. The seventh invention of the present application is a method for constructing the structure of the lower part of the wall according to the sixth invention. A long first crosspiece is fixed to the floor surface at a predetermined interval from the surface of the wall panel. The width timber is arranged on the first crosspiece with the folded-back portion protruding toward the wall panel side from the upper surface of the first crosspiece. A long second crosspiece is fixed on the first crosspiece in contact with the surface side of the width timber. One end of the retaining material is fixed to the retaining material anchor, and the other end is fixed to the separator hooking portion of the width timber. Concrete is cast and cured between the wall panel and the back side of the width timber, and the second crosspiece and the first crosspiece are removed. The eighth invention of the present application provides a structure at the lower part of a column, which comprises a wide timber as described in any one of the first to third inventions, arranged at a predetermined interval from the surface of an existing column with the back side facing the column; a retaining member having one end fixed to a retaining member anchor placed on a floor surface and the other end fixed to the separator engaging portion of the wide timber; and concrete placed and hardened between the column and the back side of the wide timber. The ninth invention of the present application is a method for constructing the structure at the lower part of a wall according to the sixth invention. In this method, a long first crosspiece is fixed to a floor surface with a predetermined interval provided from the surface of the existing column. The wide timber is arranged on the first crosspiece with the folded-back portion protruding toward the column side from the upper surface of the first crosspiece. A long second crosspiece is fixed on the first crosspiece in contact with the front side of the wide timber. One end of the retaining member is fixed to the retaining member anchor and the other end is fixed to the separator engaging portion of the wide timber. Concrete is placed and hardened between the column and the back side of the wide timber, and then the second crosspiece and the first crosspiece are removed. In the wide timber according to any one of the first to third inventions of the present application, the tenth invention is characterized in that the vertical portion has an L-shaped or U-shaped cross section in plan view and the separator engaging portion is provided on each of the two or three mutually perpendicular back surfaces. The eleventh invention of the present application provides a structure at the lower part of a column, which comprises a plurality of wide timbers as described in the tenth invention, arranged at a predetermined interval from the surface of an existing column and combined to surround the column in a rectangular shape; a separator having both ends engaged with the separator engaging portions on the opposing back surfaces of the wide timbers that form a rectangle in combination; and concrete placed and hardened within the rectangle formed by the wide timbers. The twelfth invention of the present application is a method for constructing the structure at the lower part of the pillar of the eleventh invention. A long first crosspiece is combined at a predetermined interval from the surface of the existing pillar to surround the pillar in a rectangular shape and fixed to the floor surface. The width timber is combined, and the folded-back portion protrudes from the upper surface of the first crosspiece toward the pillar side and is arranged on the first crosspiece to surround the pillar in a rectangular shape. A long second crosspiece is fixed on the first crosspiece in contact with the surface side of the width timber. The separator is hooked on the separator hooking portion on the opposite back surface of the width timber presenting a rectangle, and concrete is placed and cured within the rectangle presented by the width timber, and then the second crosspiece and the first crosspiece are removed.

Effect of the Invention

[0010] By means of the above-described problems, the present invention can obtain at least one of the following effects. (1) By reducing formwork work and plastering work, the number of processes and the adjustment between each trade are reduced, resulting in a reduction in man-hours and a shortening of the construction period. (2) Since the width timber does not require the application of a conventional coating agent, repair and maintenance due to peeling of the coating agent after construction are not required. (3) Since the width timber appears on the surface at the lower part of the pillar and wall, it has excellent design, and there is no variation in the degree of completion and appearance depending on the skill level of the operator. (4) Since the lower part of the pillar and wall is covered with the width timber, a guard pipe is not required, and the space can be widely used. (5) The width timber and the concrete are integrated through the separator and the separator hooking portion, and there is no risk of the width timber peeling off.

Brief Explanation of the Drawings

[0011]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Figure 13

Mode for Carrying Out the Invention

[0012] Hereinafter, with reference to the drawings, the wide timber, the structure of the lower part of the wall using the wide timber and its construction method, the structure of the lower part of the column and its construction method will be described in detail.

[0013] [Example 1] (1) Outline of the wide timber (Fig. 1) The wide timber 1 of the present invention is arranged at the lower part of a column or a wall. In this example, it is arranged on the surface of the concrete 31 which is the lower part of the wall. The wide timber 1 is a plate made of stainless steel. When arranged at the lower part of a column or a wall, the side that is exposed is the front surface, the side that contacts the column or the wall is the back surface, and the front surface is preferably finished with a hairline. The wide timber 1 has a vertical portion 11 extending in the vertical direction, a folded-back portion 12 extending perpendicularly from the lower end of the vertical portion 11 to the back side, and a separator latching portion 13 arranged on the back side of the vertical portion 11. Further, in this example, it has an inclined portion 14 extending obliquely upward from the upper end of the vertical portion 11 to the back side, but the vertical portion 11 can also extend to the upper end of the wide timber 1. Place the R-shaped batten 5 at the lower part of the folded-back part 12 of the batten material 1.

[0014] (2) Separator Hanging Part (Figure 2) The separator hanging part 13 is composed of a fixing part 131 extending vertically and a hanging part 132 protruding substantially vertically above and below the fixing part 131, and is provided at a predetermined interval in the width direction of the batten material 1. However, it is not limited to this, and according to the size of the batten material 1, the size of the separator hanging part 13, the number of hanging parts 132, and the interval in the width direction can be appropriately selected. The separator hanging part 13 is fixed by abutting the fixing part 131 against the back surface of the batten material 1. At this time, since welding will cause welding burns on the hairline finish on the surface of the batten material 1, it is fixed using an adhesive.

[0015] (2.1) Hanging of the Separator (Figure 3) The separator 2 is hung on the hanging part 132. The separator 2 forms a male screw part 22 at the tip of the rod-shaped main body part 21, and two nuts 23a and 23b are screwed onto the male screw part 22. Then, with a configuration where the hanging part 132 is arranged between the nuts 23a and 23b, and a depression 133 is provided on the hanging part 132 for the male screw part 22 of the separator 2 to fit into, that is, a so-called hanging separator, work from the surface side of the batten material 1 (for example, tightening by a foam tie) is not required, so the hairline finish on the surface is not damaged, and the separator 2 can be easily hung.

[0016] (3) Connection of the Batten Materials (Figure 4) When the batten material 1 is placed particularly at the lower part of the wall, it is used by connecting it in the width direction. For this reason, a plate-shaped male tenon 15 is projected from the back surface of one side end of the batten material 1 and penetrates into the female tenon 16 provided on the back surface of the other special end to prevent displacement. The male tenon 15 is a plate body and is fixed to the back surface of the batten material 1 using an adhesive. The female bolt 16 is composed of a spacer 161 made of a plate body with the same plate thickness as the male bolt 15 and a female bolt plate 162 also made of a plate body, which are polymerized and fixed together. The spacer 161 is abutted against the back surface of the width timber 1, shifted from the other end by the protruding length of the male bolt 15, and fixed using an adhesive. The female bolt plate 162 protrudes from the spacer 161 toward the other end side of the width timber 1. Since both the male bolt 15 and the female bolt 16 are provided on the back surface of the width timber 1, the width timber 1 has excellent surface design.

[0017] [Example 2] (1) Structure of the lower part of the wall (Fig. 5) Next, the structure of the lower part of the wall constructed using the width timber 1 of Example 1 will be described. In this embodiment, the lower part of the wall 3 has the width timber 1 facing each other and appearing on both side surfaces of the wall 3. And the separator 2 with both ends hooked to the separator hooking parts 13 between the width timbers 1 is embedded in the concrete 31 placed between the width timbers 1 and integrated. The width timber 1 and the concrete 31 are integrated through the separator 2 and the separator hooking parts 13, and there is no risk of the width timber 1 peeling off. At the joint between the lower end of the wall 3 and the floor 4 at the lower part of the folded-back part 12 of the width timber 1, an R-width timber 5 rounded along the floor 4 is arranged for easy cleaning. Since the lower part of the wall 3 in this embodiment has the stainless-steel width timber 1 appearing on the surface, it has excellent design and there is no variation in the degree of completion and appearance depending on the skill level of the operator. Also, since it is not necessary to apply a conventional coating agent to the width timber 1, repair and maintenance due to peeling of the coating agent after construction are not required. Since the lower part of the wall 3 is covered with the stainless-steel width timber 1, a guard pipe is not required, and the space can be widely utilized accordingly. By providing the inclined part 14 on the upper part of the width timber 1, accumulation of dust on the width timber 1 is prevented. Note that in the form of this embodiment, the width timber 1 appears on both side surfaces of the wall 3, but the width timber 1 may be arranged on the surface of one wall 3, and the surface of the other wall 3 may be another conventional wall surface.

[0018] (2) Construction method of the lower part of the wall Next, the construction method of the lower part of the wall 3 in this embodiment will be described.

[0019] (2.1) Installation of the width timber (Fig. 6) The width timber 1 is placed on the floor 4. Since a space for placing the R-width timber 5 is required below it, the long first crosspiece 61 is fixed to the upper surface of the floor 4 with screws or the like, and the width timber 1 is placed thereon. The width timber 1 is placed on the first crosspiece 61 with the folded-back part 12 protruding toward the formwork side facing it from the upper surface of the first crosspiece 61. By adjusting the height of the first crosspiece 61, the height of the width timber 1 can also be adjusted, and the width timber 1 can be placed at a uniform height. Then, in order to prevent the displacement of the width timber 1, the second crosspiece 62 is fixed on the first crosspiece 61 so as to be shifted outward from the width timber 1, and the surface of the width timber 1 abuts against the second crosspiece 62. When the width timbers 1 are connected and used in the width direction, one male tenon 15 of the adjacent width timbers 1 is penetrated into the other female tenon 16 for connection. Then, the separator 2 is hooked on the separator hooking part 13 on the back surface of the width timber 1. The opposing width timbers 1 are connected by the separator 2. In addition, as a restraint for the width timber 1, a stay 66 may be provided in which one end is fixed to the hold-down material anchor 65 driven into the floor by welding, and the other end is fixed to the hooking part 132 of the separator hooking part 13 by welding. Since the hooking part 132 protrudes from the fixing part 131 that abuts against the back surface of the width timber 1, even if the stay 66 is fixed by welding, there will be no welding burn on the surface of the width timber 1. Reinforcing vertical ribs 63, horizontal ribs 64, stays 66, etc. are arranged between the width timbers 1 to be arranged. By hanging the separator 2 to separate them, the separator 2 can be easily hooked. In this embodiment, the width timbers 1 are provided facing each other. However, one of them is not limited to the width timber 1, and a conventionally used formwork may be used. Also, in that case, the separator 2 is also appropriately selected according to the formwork used.

[0020] (2.2) Pouring of concrete (Fig. 7) Concrete 31 is placed between the two opposing width timbers 1. When the concrete 31 hardens, the lower part of the wall 3 is constructed by the width timbers 1 and the concrete 31 placed on the back thereof. The width timbers 1 do not need to be disassembled or removed like conventional formworks, and it is not necessary to perform plaster repair on the surface of the width timber part. The first crosspiece 61 and the second crosspiece 62 at the lower part of the width timber 1 are removed, and an R-width timber 5 is placed between the floor 4 after the removal of the first crosspiece 61 and the lower part of the folded-back part 12 of the width timber 1 (Fig. 5). Then, the coating agent is applied only to the surface of the R-width timber 5. In this way, by reducing formwork work and plaster work, the number of processes and the adjustment between different trades are reduced, resulting in a reduction in man-hours and a shortening of the construction period.

[0021] [Example 3] (1) Structure of the lower part of the wall configured by providing width timbers facing the wall panel (Fig. 8) In the above-mentioned Example 2, it was the structure of the lower part of the wall constructed by placing concrete 31 between the two opposing width timbers 1, but a structure of the lower part of the wall having width timbers 1 at the lower part of one surface of the wall panel 7 may also be constructed. At the lower part of the wall 3, the width timber 1 appears on one surface of the wall 3, and the other is the wall panel 7. Any structure can be selected for the structure of the surface on the opposite side of the wall panel 7. One end of the width timber 1 is fixed by welding to the retaining material anchor 65 driven into the floor, and the other end is fixed by welding to the retaining material 66 fixed to the separator hanging part 13 to fix its position. The retaining material 66 is embedded in the concrete 31 placed between the width timber 1 and the wall panel 7 to be integrated. An R-width timber 5 is placed at the lower part of the folded-back part 12 of the width timber 1 in the same manner as in Example 2.

[0022] (2) Construction method of the lower part of the wall Next, the construction method of the lower part of the wall 3 in this example will be described. A predetermined interval is provided from the surface of the wall panel 7, the first crosspiece 61 is fixed to the upper surface of the floor 4, and the width timber 1 is placed thereon. Then, in the same manner as in Example 2 above, the width timber 1 is placed on the first crosspiece 61, and the second crosspiece 62 is fixed on the first crosspiece 61 (Fig. 9). Then, one end of the brace 66 is fixed by welding to the brace anchor 65 driven into the floor, and the other end is fixed by welding to the separator hooking portion 13, thereby fixing the baseboard 1. Finally, concrete 31 is poured between the baseboard 1 and the wallboard 7, and as the concrete 31 hardens, the lower part of the wall 3 is constructed by the wallboard 7 and the concrete 31 poured on the back of the baseboard 1.

[0023] [Example 4] (1) Structure of the lower part of the pillar The above-mentioned Example 3 was a structure of the lower part of a wall 3 having a baseboard 1 on the lower part of one side of the wall panel 7, but it is also possible to construct a structure of the lower part of a pillar 8 having a baseboard 1 on the lower part of one side of the pillar 8 (Figure 10). As with the brace 66 in Example 3, one end of the brace 66 is fixed by welding to a brace anchor 65 driven into the floor, and the other end is fixed by welding to the separator hanging portion 13, thereby fixing the baseboard 1.

[0024] [Example 5] In this embodiment, a substructure of a pillar 8 in which a foundation is constructed around the lower part of the pillar 8 will be described. In this embodiment, the lower part of the pillar 8 is surrounded by two baseboards 1 that are U-shaped in plan view to form a rectangle, and concrete 31 is poured between the baseboards 1 and the pillar 8 (FIG. 11). The vertical portion 11 of the baseboard 1 has a U-shape in plan view (FIG. 12(a)), and two baseboards 1 are combined to form a rectangle. Note that, although baseboards 1 that are U-shaped in plan view were used in this embodiment, a rectangle may also be formed by combining baseboards 1 that are L-shaped in plan view (FIG. 12(b)) or that are linear in plan view as in the first embodiment. Separators 2 are placed across separator hooks 13 provided on opposing surfaces of rectangular baseboard 1 (Fig. 13). Separator hooks 13 are positioned in advance so that they face each other, but because separators 2 placed across orthogonal surfaces are perpendicular to each other in a plan view, the heights of separator hooks 13 are shifted in advance. [Explanation of symbols]

[0025] 1 Lumber, 11 Vertical part, 12 Folding part, 13 Separator hanging part, 131 Fixed part, 132 Hanging part, 133 Depression, 14 Inclined part, 15 Male tenon, 16 Female tenon, 161 Spacer, 162 Female tenon plate 2 Separator, 21 Main body part, 22 Male screw part, 23 Nut 3 Wall, 31 Concrete 4 Floor 5 L R lumber 61 First crossbar, 62 Second crossbar, 63 Upright rib, 64 Horizontal rib, 65 Brace anchor, 66 Brace 7 Wall panel 8 Column

Claims

1. A width timber to be arranged at the lower part of a wall or a column, which is in a flat plate shape with one side in the thickness direction as the front surface and the other side as the back surface, a vertical part extending in the vertical direction, a folded-back part vertically extending from the lower end of the vertical part to the back side, and a separator latching part arranged on the back surface of the vertical part, and is characterized by the width timber.

2. The width timber according to Claim 1, characterized by having an inclined part obliquely upwardly extending from the upper end of the vertical part to the back side.

3. a male tenon protruding laterally from the back side of one side end, and a female tenon corresponding to the male tenon on the back side of the other end, and is characterized by the width timber according to Claim 1.

4. A structure of the lower part of a wall, which is composed of concrete cast and cured between a pair of formworks standing opposite to each other, wherein at least one of the pair of formworks is the width timber according to any one of Claims 1 to 3, and has a separator with one end latched to the other formwork of the pair of formworks and the other end latched to the separator latching part of the width timber, and is characterized by the structure of the lower part of the wall.

5. In the construction method of the structure of the lower part of the wall according to Claim 4, wherein the pair of formworks are erected opposite to each other, and concrete is cast and cured between the pair of formworks, in the step of erecting the pair of formworks opposite to each other, a long first cross member is fixed to the floor surface with a predetermined interval provided from the other formwork of the pair of formworks, the width timber, which is one of the pair of formworks, is arranged on the first cross member with the folded-back part protruding to the other formwork side from the upper surface of the first cross member, and a long second cross member is fixed on the first cross member in contact with the front surface side of the width timber, one end of the separator is latched to the other formwork, and the other end is latched to the separator latching part of the width timber, after the concrete is cast, the second cross member and the first cross member are removed, and is characterized by the construction method of the structure of the lower part of the wall.

6. The structure of the lower part of the wall, which is composed of the width timber according to any one of Claims 1 to 3 arranged at a predetermined interval from the surface of the wall panel with the back side facing the wall panel, a retaining member with one end fixed to a retaining member anchor cast on the floor surface and the other end fixed to the separator latching part of the width timber, and concrete cast and cured between the wall panel and the back side of the width timber.

7. A long first cross member is fixed to the floor surface with a predetermined interval provided from the surface of the wall panel, ​ Place the towel-shaped wood on the first crosspiece with the folded-back part protruding from the upper surface of the first crosspiece toward the wall panel side, and fix a long second crosspiece in contact with the surface side of the towel-shaped wood on the first crosspiece. Fix one end of the retaining member to the retaining member anchor and the other end to the separator hanging portion of the towel-shaped wood. Pour and harden concrete between the wall panel and the back side of the towel-shaped wood. Characterized by removing the second crosspiece and the first crosspiece. The construction method of the structure of the lower part of the wall according to claim 6.

8. The towel-shaped wood according to any one of claims 1 to 3, which is arranged at a predetermined interval from the surface of the existing column with the back side facing the column. A retaining member having one end fixed to a retaining member anchor placed on the floor surface and the other end fixed to the separator hanging portion of the towel-shaped wood. Comprising concrete poured and hardened between the column and the back side of the towel-shaped wood. The structure of the lower part of the column.

9. Fix a long first crosspiece to the floor surface at a predetermined interval from the surface of the existing column. Place the towel-shaped wood on the first crosspiece with the folded-back part protruding from the upper surface of the first crosspiece toward the column side, and fix a long second crosspiece in contact with the surface side of the towel-shaped wood on the first crosspiece. Fix one end of the retaining member to the retaining member anchor and the other end to the separator hanging portion of the towel-shaped wood. Pour and harden concrete between the column and the back side of the towel-shaped wood. Characterized by removing the second crosspiece and the first crosspiece. The construction method of the structure of the lower part of the column according to claim 6.

10. The vertical portion is L-shaped or U-shaped in plan view, and has the separator hanging portion on each of the two or three mutually perpendicular backs. The towel-shaped wood according to any one of claims 1 to 3.

11. The towel-shaped wood according to claim 10, which is provided at a predetermined interval from the surface of the existing column and a plurality of which are combined to surround the column in a rectangle. A separator having both ends hooked to the separator hanging portions of the opposing backs of the towel-shaped wood that forms a rectangle in combination. Comprising concrete poured and hardened within the rectangle formed by the towel-shaped wood. The structure of the lower part of the column.

12. Fix a long first crosspiece in combination to surround the column in a rectangle at a predetermined interval from the surface of the existing column and fix it to the floor surface. Combining the above-mentioned width timbers, projecting the folded-back portion from the upper surface of the first crossbar toward the column side and arranging it on the first crossbar to surround the column in a rectangular shape, and fixing a long second crossbar in contact with the surface side of the width timber on the first crossbar. Hooking the separator on the separator hooking portion on the opposite back surface of the width timber presenting a rectangle. Placing and hardening concrete within the rectangle presented by the width timber. Removing the second crossbar and the first crossbar, characterized in that. A method for constructing the structure of the lower part of a column according to claim 11.

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