Towel wood, structure of the lower part of the wall and its construction method, structure of the lower part of the column and its construction method

Abstract

Provide a wide timber that can be constructed in a short construction period and does not require repair work. 【Solution means】A wide timber disposed at the lower part of a wall or a column, which is in a flat plate shape with one in the thickness direction as the front surface and the other as the back surface, has a vertical portion extending in the vertical direction, a folded-back portion vertically extending from the lower end of the vertical portion to the back surface side, and a separator latching portion disposed on the back surface of the vertical portion.

Description

Technical Field

[0001] The present invention relates to a wide wood material, a structure for the lower part of a wall using the wide wood material and a construction method thereof, a structure for the lower part of a column and a construction method thereof.

Background Art

[0002] Generally, in a building, a wide wood is provided at the joint between the lower part of a wall or column and the floor to protect the lower part of the wall or column and to beautifully finish the joint part. For example, when partitioning walls are provided in a factory, a warehouse, etc., the lower body of the partitioning wall is constructed of reinforced concrete, and the surface is finished with mortar to form a wide wood part.

[0003] When constructing the lower body with reinforced concrete and finishing the surface with mortar to form a wide wood 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 (Euclid (registered trademark)) to the floor and the wide wood part, and a step of attaching a guard pipe for protecting the wide wood part from a cart, a forklift, etc. are performed.

[0004] In addition, Patent Document 1 describes a method of constructing the lower part of a partitioning wall by fixing a wide wood mortar finishing production plate serving as a wide wood 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] Conventional methods of constructing the lower part of a wall with reinforced concrete and finishing the surface with mortar to form a skirting board had the following problems. (1) There were many processes, adjustment between different trades was required, and the construction period became long. (2) Even after construction was completed, there was a risk of repair and maintenance due to peeling of the floor covering material applied to the skirting board. (3) Repair work for the lower structure and skirting board was essential, and there were variations in the degree of completion and appearance depending on the skill level of the workers.

[0007] Also, since the skirting board 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 skirting board that can be constructed in a short construction period and does not require repair work, a structure for the lower part of a wall using the same, a structure for 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 skirting board 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, a vertical portion extending in the vertical direction, a folded-back portion perpendicularly extending from the lower end of the vertical portion to the back surface side, and a separator latching portion disposed on the back surface of the vertical portion. A male projection protruding laterally from the back side of one side end portion, and a female projection corresponding to the male projection on the back side of the other end portion, It is characterized by having the above. The second invention of the present application is characterized in that, in the skirting board of the first invention, it has an inclined portion obliquely upwardly extending from the upper end of the vertical portion to the back surface side. 。 This Wish's No. Three The invention is a structure of the lower part of a wall made of concrete cast and cured between a pair of formworks standing opposite each other, wherein at least one of the pair of formworks is the skirting board of the first invention. Or the second invention It is characterized by having a separator with one end latched to the other formwork of the pair of formworks and the other end latched to the separator latching portion of the skirting board. The No. of the present application FourThe invention stands the pair of formworks upright facing each other, places concrete between the pair of formworks, and cures it. The Three In the method for constructing the structure of the lower part of the wall of the invention, in the step of standing the pair of formworks upright facing each other, a long first crosspiece 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 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 on the other formwork, and the other end is hooked on the separator hooking portion of the width timber. After placing the concrete, the second crosspiece and the first crosspiece are removed. This is the gist of the invention. The Five The invention provides a structure of the lower part of a wall, which includes a width timber of the first invention arranged at a predetermined interval from the surface of the wall panel and facing the back side of the wall panel, a retaining material having one end fixed to a retaining material anchor placed on the floor surface and the other end fixed to the separator hooking portion of the width timber, and concrete placed and cured between the wall panel and the back side of the width timber. Or the second invention The invention provides a structure of the lower part of a wall, which includes a width timber of the first invention arranged at a predetermined interval from the surface of the wall panel and facing the back side of the wall panel, a retaining material having one end fixed to a retaining material anchor placed on the floor surface and the other end fixed to the separator hooking portion of the width timber, and concrete placed and cured between the wall panel and the back side of the width timber. The Six The Five The invention is a method for constructing the structure of the lower part of the wall of the 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 placed and cured between the wall panel and the back side of the width timber, and then the second crosspiece and the first crosspiece are removed. This is the gist of the invention. The Seven The invention provides a structure of the lower part of a wall, which includes a width timber of the first invention arranged at a predetermined interval from the surface of an existing column and facing the back side of the column. Or the second inventionA structure at the lower part of a column is provided, which includes a width timber as described, 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 width timber, and concrete placed and hardened between the column and the back side of the width timber. The Eight invention of the Seven construction method of the structure at the lower part of the wall of the invention, which comprises providing a predetermined interval from the surface of the existing column, fixing a long first crosspiece to the floor surface, arranging the width timber on the first crosspiece with the folded-back portion protruding toward the column side from the upper surface of the first crosspiece, fixing a long second crosspiece in contact with the surface side of the width timber on the first crosspiece, fixing one end of the retaining member to the retaining member anchor and the other end to the separator hanging portion of the width timber, placing and hardening concrete between the column and the back side of the width timber, and removing the second crosspiece and the first crosspiece. The Nine invention of the Or the second invention width timber of the first invention, wherein the vertical portion is in an L shape or a U shape in plan view and has the separator hanging portion on each of the two or three back surfaces that are perpendicular to each other. The Ten invention of the Nine width timber of the invention, which provides a structure at the lower part of a column, including a width timber of the invention that is provided at a predetermined interval from the surface of an existing column and surrounds the column in a rectangular shape by combining a plurality of them, a separator having both ends hooked to the separator hanging portions of the opposing back surfaces of the width timbers that form a rectangle in combination, and concrete placed and hardened within the rectangle formed by the width timbers. The Eleven invention of the Ten shotsA construction method for the structure at the lower part of the column of light, characterized in that a long first crossbar is combined at a predetermined interval from the surface of the existing column to surround the column in a rectangle and fixed to the floor surface, the width timber is combined, the folded-back part protrudes from the upper surface of the first crossbar to the column side and is arranged on the first crossbar to surround the column in a rectangle, and a long second crossbar is fixed on the first crossbar in contact with the surface side of the width timber, the separator is hooked on the separator hooking part on the opposite back surface of the width timber presenting a rectangle, concrete is placed and cured in the rectangle presented by the width timber, and the second crossbar and the first crossbar are removed.

Advantages of the Invention

[0010] By means of the above-mentioned means for solving the above-mentioned 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 different trades 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 column and wall, it has excellent design properties, 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 column and wall is covered with the width timber, guard pipes are not required, and the space can be widely used accordingly. (5) The width timber and the concrete are integrated through the separator and the separator hooking part, and there is no risk of the width timber peeling off.

Brief Description of the Drawings

[0011]

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Mode for Carrying Out the Invention

[0012] Hereinafter, with reference to the drawings, the width timber, the structure of the lower part of the wall using the width timber and its construction method, and 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 width timber (Fig. 1) The width timber 1 of the present invention is arranged at the lower part of the column or the wall. In this embodiment, it is arranged on the surface of the concrete 31 that forms the lower part of the wall. The width timber 1 is a plate made of stainless steel. When arranged at the lower part of the column or the 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 width timber 1 has a vertical portion 11 that extends in the vertical direction, a folded-back portion 12 that extends perpendicularly from the lower end of the vertical portion 11 to the back side, and a separator hanging portion 13 that is arranged on the back side of the vertical portion 11. Further, in this embodiment, it has an inclined portion 14 that extends 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 width timber 1. Place the R trim 5 below the folded portion 12 of the trim wood 1.

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

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

[0016] (3) Connection of the Trim Wood (Figure 4) When the trim wood 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 projects from the back surface of one side end of the trim wood 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 trim wood 1 using an adhesive. The female plug 16 is composed of a spacer 161 made of a plate body with the same plate thickness as the male plug 15 and a female plug plate 162 also made of a plate body, which are superposed and fixed. 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 plug 15, and fixed using an adhesive. The female plug plate 162 protrudes from the spacer 161 toward the other end side of the width timber 1. Since both the male plug 15 and the female plug 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 (Figure 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, whose both ends are 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 will be no variation in the degree of completion and appearance depending on the skill level of the operator. Also, since there is no need to apply a conventional coating agent to the width timber 1, there is no need for repair or maintenance due to peeling of the coating agent after construction. Since the lower part of the wall 3 is covered with the stainless-steel width timber 1, a guard pipe is not required, and a larger space can be 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. It should be noted 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 a wall surface of other conventional types.

[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 arranged on the floor 4. However, since a space for arranging 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 arranged thereon. The width timber 1 is arranged on the first crosspiece 61 with the folded-back portion 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 arranged 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 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 portion 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 sway prevention of the width timber 1, a stay 66 may be provided with one end fixed to the stay anchor 65 driven into the floor by welding and the other end fixed to the hooking portion 132 of the separator hooking portion 13 by welding. Since the hooking portion 132 protrudes from the fixing portion 131 abutting 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. However, by hanging the separator 2 to make a separator, 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) Place the concrete 31 between the laterally arranged lateral timbers 1. As the concrete 31 hardens, the lower part of the wall 3 is constructed by the lateral timbers 1 and the concrete 31 placed on the back thereof. The lateral 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 lateral timber part. Remove the first crosspiece 61 and the second crosspiece 62 at the lower part of the lateral timber 1, and place the R-shaped lateral timber 5 between the floor 4 after removing the first crosspiece 61 and the lower part of the folded-back part 12 of the lateral timber 1 (Fig. 5). Then, the coating agent is applied only to the surface of the R-shaped lateral timber 5. In this way, by reducing the 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 lateral timbers facing the wall panel (Fig. 8) In the above-mentioned Example 2, the structure of the lower part of the wall was constructed by placing the concrete 31 between the laterally arranged lateral timbers 1. However, a structure of the lower part of the wall having the lateral timber 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 lateral timber 1 appears on one surface of the wall 3, and the other is the wall panel 7. The structure of the opposite surface of the wall panel 7 can be selected arbitrarily. One end of the lateral timber 1 is fixed to the stay anchor 65 driven into the floor by welding, and the other end is fixed to the separator hanging part 13 by welding to the stay 66, thereby fixing its position. The stay 66 is embedded in the concrete 31 placed between the lateral timber 1 and the wall panel 7 and integrated therewith. Place the R-shaped lateral timber 5 at the lower part of the folded-back part 12 of the lateral 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 of this example will be described. Provide a predetermined interval from the surface of the wall panel 7, fix the first crosspiece 61 on the upper surface of the floor 4, and place the lateral timber 1 thereon. Then, in the same manner as in Example 2 above, place the lateral timber 1 on the first crosspiece 61 and fix the second crosspiece 62 on the first crosspiece 61 (Fig. 9). Then, one end of the brace 66 is fixed to the brace anchor 65 driven into the floor by welding, and the other end is fixed to the separator hanging portion 13 by welding to fix the wide timber 1. Finally, concrete 31 is placed between the wide timber 1 and the wall panel 7, and as the concrete 31 hardens, the lower part of the wall 3 is constructed by the concrete 31 placed on the back surface of the wall panel 7 and the wide timber 1.

[0023] [Example 4] (1) Structure at the lower part of the column In the above-described Example 3, it was the structure of the lower part of the wall 3 having the wide timber 1 at the lower part of one surface of the wall panel 7, but it is also possible to construct the structure of the lower part of the column 8 having the wide timber 1 at the lower part of one surface of the column 8 (Fig. 10). Similar to the brace 66 in Example 3, one end of the brace 66 is fixed to the brace anchor 65 driven into the floor by welding, and the other end is fixed to the separator hanging portion 13 by welding to fix the wide timber 1.

[0024] [Example 5] In this example, the lower structure of the column 8 in which a foundation is constructed around the lower part of the column 8 will be described. In this example, the lower part of the column 8 is surrounded in a rectangular shape using two wide timbers 1 having a U-shaped cross-section in plan view, and concrete 31 is placed between the wide timber 1 and the column 8 for construction (Fig. 11). The wide timber 1 has a vertical portion 11 presenting a U-shaped cross-section in plan view (Fig. 12(a)), and two wide timbers 1 are combined to form a rectangle. In this example, the wide timber 1 having a U-shaped cross-section in plan view is used, but it may also be possible to form a rectangle by combining wide timbers 1 having an L-shaped cross-section in plan view (Fig. 12(b)) or straight-line-shaped wide timbers 1 in plan view as in Example 1. The separator 2 is arranged across between the separator hanging portions 13 provided on the opposing surfaces of the wide timber 1 presenting a rectangular shape (Fig. 13). The separator hanging portions 13 are arranged to face each other in advance, but since the separators 2 provided across orthogonal surfaces are orthogonal in plan view, the height of the separator hanging portions 13 is shifted in advance.

Explanation of reference numerals

[0025] 1 Lumber, 11 Vertical part, 12 Folding part, 13 Separator hanging part, 131 Fixing part, 132 Hanging part, 133 Depression, 14 Inclined part, 15 Male tenon, 16 Female tenon, 161 Spacer, 162 Female tenon plate 2 Separator, 21 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 surface side, a separator latching part arranged on the back surface of the vertical part, a male tenon protruding laterally from the back surface side of one side end, and a female tenon corresponding to the male tenon on the back surface side of the other end, and is characterized by having the above, width timber.

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

3. A structure at the lower part of a wall, which is composed of concrete placed and cured between a pair of vertically arranged formworks facing each other, at least one of the pair of formworks is the width timber according to Claim 1 or 2, and is characterized by having 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, structure at the lower part of a wall.

4. In the construction method of the structure at the lower part of a wall according to Claim 3, where the pair of formworks are vertically arranged facing each other and concrete is placed and cured between the pair of formworks, in the step of vertically arranging the pair of formworks facing 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 placed, the second cross member and the first cross member are removed, and is characterized by the above, construction method of the structure at the lower part of a wall.

5. The width timber according to Claim 1 or 2, which is arranged with a predetermined interval provided from the surface of the wall panel and facing the back surface side of the wall panel, a stay member with one end fixed to a stay anchor placed on the floor surface and the other end fixed to the separator latching part of the width timber, and concrete placed and cured between the wall panel and the back surface side of the width timber, and is composed of the above, structure at the lower part of a wall.

6. A long first cross member is fixed to the floor surface with a predetermined interval provided from the surface of the wall panel, ​ The baseboard is placed on the first crosspiece with the folded portion protruding from the top surface of the first crosspiece toward the wall panel, and a long second crosspiece is fixed onto the first crosspiece by abutting the front side of the baseboard, One end of the brace is fixed to the brace anchor and the other end is fixed to the separator hook portion of the baseboard; pouring concrete between the wallboard and the rear side of the baseboard and allowing it to harden; The second crosspiece and the first crosspiece are removed. A method for constructing a wall underside structure according to claim 5.

7. The baseboard according to claim 1 or 2, which is disposed with the back side facing the existing pillar at a predetermined distance from the surface of the existing pillar; A brace having one end fixed to a brace anchor installed on the floor surface and the other end fixed to the separator hooking portion of the baseboard; and concrete poured and hardened between the pillar and the rear side of the skirting board. The structure of the lower part of the pillar.

8. A long first crosspiece is fixed to a floor surface at a predetermined distance from the surface of the existing pillar; The baseboard is placed on the first crosspiece with the folded portion protruding from the top surface of the first crosspiece toward the pillar, and a long second crosspiece is fixed onto the first crosspiece by abutting the front side of the baseboard, One end of the brace is fixed to the brace anchor and the other end is fixed to the separator hook portion of the baseboard; pouring concrete between the pillar and the rear side of the baseboard and allowing it to harden; The second crosspiece and the first crosspiece are removed. A method for constructing a column lower structure according to claim 7.

9. The vertical portion is L-shaped or U-shaped in a plan view, and has the separator hooking portion on each of the back surfaces of two or three orthogonal surfaces.

3. Skirting board according to claim 1 or 2.

10. The baseboard of claim 9, wherein a plurality of the baseboards are combined to surround an existing pillar in a rectangular shape at a predetermined distance from the surface of the existing pillar; a separator having both ends hooked to the separator hooking portions on the opposing back surfaces of the skirting board that are combined to form a rectangle; and concrete poured and hardened within the rectangular area defined by the skirting board. The structure of the lower part of the pillar.

11. A predetermined distance is provided from the surface of the existing pillar, and a long first crosspiece is assembled to surround the pillar in a rectangular shape and fixed to the floor surface; Combining the above-mentioned wide timbers, projecting the folded-back part 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 wide timber on the first crossbar. Hooking the separator on the separator hooking part on the opposite back surface of the wide timber presenting a rectangle. Placing and curing concrete within the rectangle presented by the wide timber. Removing the second crossbar and the first crossbar, characterized by. The construction method of the structure of the lower part of the column according to claim 10.

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