JP2019183431A - Spandrel wall and method for construction thereof - Google Patents

Abstract

To provide a construction method for a spandrel wall which is easy to construct and can exhibit high waterproof performance.SOLUTION: A method for constructing a spandrel wall including a first spandrel wall part and a second spandrel wall part includes: the first spandrel wall part attaching step for attaching a plurality of first spandrel wall parts to a plurality of struts, respectively; the second spandrel wall part attaching step for attaching the second spandrel wall part between a plurality of second spandrel wall parts; and the second spandrel wall part is not directly attached to the struts. As a result, the width of the first spandrel wall part and the second spandrel wall part becomes shorter than the distance between the struts, and the weight per each can be reduced. In addition, since the second spandrel wall part is attached to the first spandrel wall part attached to the strut, the second spandrel wall part is stably attached. Further, since the second spandrel wall part is not attached to the strut, labor saving can be achieved.SELECTED DRAWING: Figure 5

Description

  The present invention relates to an improvement in a waist wall and a construction method thereof.

  As one method for constructing the waist wall, there is a method in which a plurality of precast concrete waist wall members are arranged and attached between a plurality of support columns. For example, in Patent Document 1, a fitting groove is formed along the arrangement direction of the columns on the upper surface of the foundation outside the plurality of columns, and the fitting protrusion at the lower end of the waist wall member is fitted into the fitting groove. The upper part of the waist wall member is temporarily fixed to the column with bolts, the position of the waist wall member is adjusted using a bar from the indoor side, and then the upper part of the waist wall member is permanently joined to the column. A method for constructing a wall is described (see claim 1 of Patent Document 1).

Japanese Patent No. 4884269

According to the technique described in Patent Document 1, it is possible to improve the efficiency of work on site as compared with the case where the waist wall is constructed by the cast-in-place concrete method. However, in the technique described in Patent Document 1, since a waist wall member having a width corresponding to the interval between a pair of adjacent struts is used, the weight per waist wall member increases, and its handling is difficult. There was a problem that there was. Furthermore, since the opposing surfaces of the waist wall members described in Patent Document 1 are flat (see FIG. 2 of Cited Document 1), another waist wall member approaches the installed waist wall member. When installed, the packing disposed between the two members may undergo unintended deformation (for example, twist) due to strong friction between the opposing surfaces of the waist wall member, or may be dropped or damaged. there's a possibility that. If it does so, there exists a possibility that packing may become unable to exhibit sufficient waterproof function.
Accordingly, an object of the present invention is to provide a method for constructing a waist wall that is easy to construct and can exhibit high waterproof performance.

The inventors of the present invention have intensively studied to solve the above problems, and as a result, have arrived at the various aspects of the present invention as follows.
That is, the waist wall construction method according to the first aspect of the present invention is a waist wall construction method including a first waist wall portion and a second waist wall portion, and a plurality of first waists with respect to a plurality of support columns. A first waist wall part attaching step for attaching each of the wall parts; and a second waist wall part attaching step for attaching a second waist wall part between the plurality of first waist wall parts. It is a construction method of the waist wall that can not be attached to.

  According to the above construction method, the first waist wall is used because the first waist wall portion attached to the support column and the second waist wall portion attached to the first waist wall portion attached to the support column are used. Both the width of the portion and the second waist wall portion can be shorter than the distance between the adjacent struts. Thereby, the weight per each of a 1st waist wall part and a 2nd waist wall part can be reduced, and workability | operativity improves. And since the 2nd waist wall part is attached with respect to the 1st waist wall part already attached to the support | pillar, when attaching a 2nd waist wall part, it can attach stably. Further, since the second waist wall portion cannot be attached to the support column, labor can be saved by that amount. The tilt prevention of the second waist wall portion is performed only at the first waist wall portion.

According to the second aspect of the present invention, in the construction method, the first waist wall portion attaching step attaches the plurality of first waist wall portions to the plurality of support columns in a one-to-one correspondence.
According to such a structure, since each 1st waist wall part is attached only to one support | pillar, workability | operativity improves.

According to the third aspect of the present invention, in the construction method described above, the first waist wall portion is formed on the side surface other than the side surfaces constituting the inner surface and the outer surface of the waist wall, and the first waist wall portion and the second waist wall. A first inclined surface portion that is a surface portion inclined with respect to the extending direction of the waist wall formed by the portion, and the second waist wall portion is provided on the side surface other than the side surfaces constituting the inner surface and the outer surface of the waist wall. When the second waist wall portion is attached to the first waist wall portion by the second waist wall portion attaching step, the second slope wall portion is a surface portion that is sloped with respect to the extending direction of the wall. The first inclined surface portion and the second inclined surface portion face each other.
According to such a configuration, when the second waist wall portion is moved in the direction perpendicular to the extending direction of the waist wall and attached close to the first waist wall portion, the first inclined surface portion and the second inclined surface are provided. The part approaches while facing diagonally. Therefore, when the packing is installed between the first inclined surface portion and the second inclined surface portion (the fourth aspect of the present invention), the packing is not twisted, dropped, or damaged.

  According to the fifth aspect of the present invention, the width of the first waist wall portion is narrower than the width of the second waist wall portion. According to this, the lower weight first waist wall portion is attached to the support first, and the relatively heavy second waist wall portion can be supported by the two first waist wall portions on both sides thereof. The workability is improved.

  According to a sixth aspect of the present invention, there is provided a waist wall having a first waist wall portion and a second waist wall portion, wherein the first waist wall portion is other than the side surfaces constituting the inner surface and the outer surface of the waist wall. The first waist surface portion is a surface portion that is inclined with respect to the extending direction of the waist wall formed by the first waist wall portion and the second waist wall portion, and the second waist wall portion is a waist wall. The second inclined surface portion that is a surface portion that is inclined with respect to the extending direction of the waist wall is provided on a side surface other than the side surfaces that constitute the inner surface and the outer surface of the first wall. A waist wall is provided opposite the face portion.

According to the seventh aspect of the present invention, the waist wall further includes a packing sandwiched between the first inclined surface portion and the second inclined surface portion.
Moreover, according to the 8th aspect of this invention, said waist wall further has the support | pillar which attaches a 1st waist wall part, and a 2nd waist wall part is not attached with respect to a support | pillar.
Furthermore, according to the ninth aspect of the present invention, in the waist wall, the width of the first waist wall portion is narrower than the width of the second waist wall portion.

FIG. 1 is a plan view schematically showing an example of a waist wall according to an embodiment of the present invention. FIG. 2 is a plan view showing a part surrounded by a one-dot chain line II in the waist wall of FIG. FIG. 3 is a view showing one of a plurality of first waist wall portions constituting the waist wall of FIG. 4 is a view showing one of a plurality of second waist wall portions constituting the waist wall of FIG. FIG. 5 is an explanatory diagram for explaining an example of a procedure for constructing the waist wall of FIG. 1. FIG. 6 is an explanatory diagram for explaining a part of the procedure of FIG. FIG. 7A is an enlarged view of a part of the column of FIG. 5A, and FIG. 7B is a cross-sectional view of the column of FIG. 7A taken along VIIB-VIIB. FIG. 8 is a view of a part of the first waist wall portion of FIG. 5 (B) as seen in the direction of arrow VIII.

  Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a plan view schematically showing an example of a waist wall 1 according to an embodiment of the present invention. The waist wall 1 mainly includes a plurality of first waist wall portions 10, a plurality of second waist wall portions 20, and a plurality of support columns 30. FIG. 2 is a plan view showing a portion surrounded by the alternate long and short dash line II in the waist wall 1 of FIG. As shown in FIG. 2, the first waist wall portions 10 are respectively attached to the side surfaces of a pillar 30 (for example, a square steel pipe) made of steel standing on the floor, and each second waist wall portion. 20 is attached between the pair of first waist wall portions 10. As the support 30, an H-shaped steel or the like can be used in addition to a square steel pipe.

  FIG. 3 is a view showing one of the first waist wall portions 10. 3A is a view showing the upper surface 11 of the first waist wall portion 10, and FIG. 3B is a view of the first waist wall portion 10 of FIG. 3A as viewed in the direction of arrow IIIB. FIG. 3C is a diagram showing a side surface 12 constituting the outer surface of the waist wall 1, and FIG. 3C is a diagram of the first waist wall portion 10 of FIG. 3B viewed in the direction of arrow IIIC, and FIG. ) Is a view of the first waist wall portion 10 of FIG. 3A as viewed in the direction of arrow IIID, and is a view showing the side surface 13 constituting the inner surface of the waist wall 1.

  As shown in FIG. 3 (A), a plurality of long nut-shaped inserts 111 for attaching an instrument for suspending and moving the first waist wall portion 10 are embedded in the upper surface 11 of the first waist wall portion 10. The end of the screw hole of the insert 111 is open to the upper surface 11. As shown in FIG. 3D, a metal connecting plate 60 (FIG. 6E for connecting the first waist wall portion 10 and the second waist wall portion 20 is provided near the left and right edges of the side surface 13. A plurality of first recesses 131 are formed for receiving the reference). Further, a long nut-like insert 132 for bolting the connecting plate 60 is embedded in each first recess 131, and a screw hole end of the insert 132 is opened in each first recess 131. Also, near the lower edge of the side surface 13, a plurality of long nut-like inserts 133 for embedding the adjusters 51 (see FIGS. 5 and 8) are embedded, and the screw hole ends of the inserts 133 are open to the side surface 13. is doing. Further, a plurality of long nut-like inserts 134 for bolting the support columns 30 are embedded in the vicinity of the center portion in the left-right direction of the side surface 13, and the screw hole ends of the inserts 134 are open to the side surface 13.

  FIG. 3E is an enlarged view of the vicinity of the end portion surrounded by the alternate long and short dash line IIIE in the first waist wall portion 10 of FIG. In FIG. 3E, the vicinity of the end of the second waist wall portion 20 that is adjacent to the first waist wall portion 10 when the waist wall 1 is constructed is indicated by a two-dot chain line. As shown in FIGS. 3A and 3E, among the four side surfaces of the first waist wall portion 10, the side surface 14 other than the side surface 12 forming the outer surface and the side surface 13 forming the inner surface of the first waist wall portion 10 includes A first inclined surface portion 141 that is inclined with respect to the extending direction of the wall 1, that is, the direction in which the first waist wall portion 10 and the second waist wall portion 20 constituting the waist wall 1 are arranged is formed. A first inclined surface portion 141 is formed from the side surface 13 via a flat surface (surface in the thickness direction of the first waist wall portion 10), and is inclined so as to face the inner side surface 13. The edge portion between the flat surface and the side surface 13 is face-tried. Further, a first concave groove 142 is formed on the side surface 12 side of the side surface 14 with respect to the first inclined surface portion 141. The first concave groove 142 is connected to the first inclined surface portion 141 via a flat surface (surface in the thickness direction of the first waist wall portion 10). The first concave groove 142 is slightly inclined in the opposite direction to the first inclined surface portion 141 so as to have a dovetail structure. The edge portion between the first concave groove 142 and the side surface 12 is flush.

  FIG. 4 is a view showing one of the second waist wall portions 20. 4A is a view showing the upper surface 21 of the second waist wall portion 20, and FIG. 4B is a view of the second waist wall portion 20 of FIG. 4A viewed in the direction of arrow IVB. FIG. 4C is a diagram showing a side surface 22 constituting the outer surface of the waist wall 1, and FIG. 4C is a diagram of the second waist wall portion 20 of FIG. 4B viewed in the direction of arrow IVC, and FIG. ) Is a view of the second waist wall portion 20 of FIG. 4A as viewed in the direction of the arrow IVD, and is a view showing the side surface 23 constituting the inner surface of the waist wall 1.

  As shown in FIG. 4 (A), a plurality of long nut-like inserts 211 for attaching an instrument for suspending and moving the second waist wall portion 20 are embedded in the upper surface 21 of the second waist wall portion 20. The end of the screw hole of the insert 211 is open to the upper surface 21. As shown in FIG. 4D, a plurality of second plates for accommodating connection plates 60 for connecting the first waist wall portion 10 and the second waist wall portion 20 are provided near the left and right edges of the side surface 23. Two recesses 231 are formed. Further, a long nut-like insert 232 for bolting the connecting plate 60 is embedded in each second recess 231, and a screw hole end of the insert 232 is opened in each second recess 231. A plurality of long nut-like inserts 233 for bolting adjusters 52 (see FIG. 5) are embedded near the lower edge of the side surface 23, and the screw hole ends open to the side surface 23.

  FIG. 4E is an enlarged view of the vicinity of the end portion surrounded by the alternate long and short dash line IVE in the second waist wall portion 20 of FIG. In FIG. 4E, the vicinity of the end of the first waist wall portion 10 that is disposed adjacent to the second waist wall portion 20 when the waist wall 1 is constructed is indicated by a two-dot chain line. As shown in FIGS. 4A and 4E, among the four side surfaces of the second waist wall portion 20, the side surface 24 other than the side surface 22 forming the outer surface of the waist wall 1 and the side surface 23 forming the inner surface is provided with a waist. A second inclined surface portion 241 that is inclined with respect to the direction in which the wall 1 extends, that is, the direction in which the first waist wall portion 10 and the second waist wall portion 20 constituting the waist wall 1 are arranged is formed. A flat surface (a surface in the thickness direction of the second waist wall portion 20) is interposed between the inner side surface 23 and the second inclined surface portion 241, and the second inclined surface portion 241 is a virtual extension surface of the side surface 23. It is inclined to face each other. The edge portion between the flat surface and the side surface 23 is face-tried. Further, a second concave groove 242 is formed on the side surface 22 side of the side surface 24 relative to the second inclined surface portion 241. The second concave groove 242 is connected to the second inclined surface portion 241 via a flat surface (surface in the thickness direction of the second waist wall portion 20). The second concave groove 242 is slightly inclined in the same direction as the second inclined surface portion 241 so as to have a dovetail structure. Edge portions of the second concave groove 242 and the side surface 22 are flush.

  As shown in FIGS. 3E and 4E, when the first waist wall portion 10 and the second waist wall portion 20 are arranged so as to construct the waist wall 1, the first waist wall portion 10 The 1st inclined surface part 141 and the 2nd inclined surface part 241 of the 2nd waist wall part 20 have the positional relationship which opposes so that it may mutually become substantially parallel. Each flat surface is also arranged in parallel. Further, at that time, the first concave groove 142 and the second concave groove 242 are used for driving the caulking material into a portion that is the outer side of the waist wall 1 and is a joint between the first waist wall portion 10 and the second waist wall portion 20. Form a waterproof construction groove. The waterproof construction groove may be formed in a dovetail structure so that the lateral width becomes slightly narrower from the inner side to the outer side of the waist wall 1, that is, the retention property of the caulking material can be improved.

Next, a method for constructing the waist wall 1 of the present embodiment will be described with reference to FIGS.
First, as shown in FIG. 5A, a plurality of support columns 30 are built at predetermined positions on the foundation 101. The support column 30 may be erected in such a manner that a lower portion thereof is embedded in the foundation 101.
Next, as shown in FIG. 5B, the first waist wall portion 10 is attached to the support column 30. A plurality of angles 31 are attached to the side surface of the support column 30. In the illustrated example, two pairs of angles 31 are attached to one column 30. For example, the angle 31 may be made of a metal material and attached to the support column 30 by welding or screwing.
FIG. 7A is a view showing the vicinity of a portion where the angle 31 of the column 30 is attached. FIG. 7B is a VIIB-VIIB sectional view of the column 30 of FIG. As shown in the figure, each angle 31 is formed with a groove 311 that opens upward.

  In order to attach the first waist wall portion 10 to the support column 30, the bolt 40 temporarily tightened with respect to the plurality of inserts 134 of the first waist wall portion 10 is moved upward with respect to the groove 311 of the corresponding angle 31. The first waist wall portion 10 is suspended and moved so as to be inserted from the first position, the position of the first waist wall portion 10 is finely adjusted by the adjuster 51, and the bolt 40 is fastened to the insert 134 and finally fixed. Can be illustrated.

  FIG. 8 is a view of a part of the first waist wall portion 10 of FIG. 5B as seen in the direction of arrow VIII. As shown in FIG. 8, the adjuster 51 is an angle member made of a metal material, and has a vertical surface portion and a horizontal surface portion, and the vertical surface portion is fastened to the insert 133 of the first waist wall portion 10 by a bolt 91. Another bolt 92 is screwed into the screw hole in the horizontal surface portion of the adjuster 51, and the tip of the bolt 92 is in contact with a receiving plate 93 installed on the foundation 101. The position (height and inclination) of the first waist wall portion 10 can be finely adjusted by rotating the bolt 92 forward and backward with respect to the screw hole of the horizontal surface portion of the adjuster 51.

  Next, as shown in FIG. 5C, the second waist wall portion 20 is installed between the adjacent first waist wall portions 10. FIG. 6 shows a situation where the second waist wall portion 20 is installed between the adjacent first waist wall portions 10 as viewed from above. First, as shown in FIG. 6A, a water-stopping packing 80 made of a resin material or the like is attached to the first inclined surface portion 141 of the first waist wall portion 10. It is preferable that the packing 80 extends from the vicinity of the upper end of the first inclined surface portion 141 to the vicinity of the lower end. Next, as shown in FIG. 6B, the suspended second waist wall portion 20 is brought closer to the gap between the first waist wall portions 10 from the side opposite to the support column 30. And as shown in FIG.6 (C), the 2nd waist wall part 20 is arrange | positioned between the adjacent 1st waist wall parts 10, and these are aligned in a line. At this time, both the second inclined surface portions 241 of the second waist wall portion 20 face each other so as to be substantially parallel to each of the first inclined surface portions 141 of the first waist wall portion 10 adjacent to both sides, The packing 80 is sandwiched between them. The packing 80 may be attached to the second inclined surface portion 241 side, or may be attached to both the first inclined surface portion 141 and the second inclined surface portion 241.

  In the state of FIG. 6C, the first recess 131 of the first waist wall portion 10 and the corresponding second recess 231 of the second waist wall portion 20 are adjacent to each other. As shown in FIG. 6D, one connecting plate 60 is inserted and accommodated in the adjacent first recess 131 and second recess 231. As shown in FIG. 6E, two holes are formed in the connection plate 60. When the connection plate 60 is inserted into and accommodated in the adjacent first recess 131 and second recess 231, these holes become the first holes. The positions correspond to the opening of the insert 132 of the waist wall portion 10 and the opening of the insert 232 of the second waist wall portion 20, respectively. In this state, the first lumbar wall portion 10 and the second lumbar wall portion 20 are coupled by the coupling plate 60 by fastening the bolt 70 to the inserts 132 and 232 and fixing the coupling plate 60. In the present embodiment, the adjacent first waist wall portion 10 and second waist wall portion 20 are connected by two upper and lower connection plates 60. At the time of connection, the position of the second waist wall portion 20 can be finely adjusted by the adjuster 52. At that time, the bolt 40 that attaches the first waist wall portion 10 to the column 30 may be slightly loosened, and the position of the first waist wall portion 10 may be finely adjusted by the adjuster 51. The structure and function of the adjuster 52 are the same as those of the adjuster 51.

In this way, as shown in FIG. 5C, the attachment of the first waist wall portion 10 to the support column 30 and the attachment of the second waist wall portion 20 to the first waist wall portion 10 are completed. The tilt prevention of the second waist wall portion is performed exclusively at the first waist wall portion. That is, the second waist wall portion is not supported by the support column 30. Next, as shown in FIG. 5D, a floor 102 may be formed on the foundation 101 with concrete or the like. The floor 102 may be formed to a height that covers the adjusters 51 and 52.
Finally, the caulking material is filled into the waterproof construction groove formed by the first concave groove 142 and the second concave groove 242.

  According to the construction method of the waist wall 1 according to the present embodiment described above, the first waist wall portion 10 attached to the support column 30 and the first waist wall portion 10 attached to the support column 30 are attached. Since the two waist wall portions 20 are used, the width of each of the first waist wall portion 10 and the second waist wall portion 20 can be shorter than the distance between the adjacent struts 30. Thereby, the weight per each of the 1st waist wall part 10 and the 2nd waist wall part 20 can be reduced, and workability | operativity improves. And since the 2nd waist wall part 20 is attached with respect to the 1st waist wall part 10 already attached to the support | pillar 30, when attaching the 2nd waist wall part 20, it can attach stably. Moreover, since the 2nd waist wall part 20 is not attached to the support | pillar 30, labor saving can be aimed at.

  As shown in FIGS. 1 to 5, the width of the first waist wall portion 10 may be narrower than the width of the second waist wall portion 20. For example, the width of the second waist wall portion 20 may be about twice the width of the first waist wall portion 10. According to this, since the lower weight 1st waist wall part 10 is attached to the support | pillar 30 first, the comparatively heavy 2nd waist wall part can be supported by the two 1st waist wall parts of the both sides. The workability is improved.

  The first waist wall portion 10 has a first inclined surface portion 141, the second waist wall portion 20 has a second inclined surface portion 241, and the first waist wall portion 10, the second waist wall portion 20, 6B, as shown in FIG. 6B, the first inclined surface portion 141 and the second inclined surface portion 241 approach while facing each other in an oblique direction. Therefore, the packing 80 disposed between the first inclined surface portion 141 and the second inclined surface portion 241 mainly receives pressure in the thickness direction thereof, so that the packing 80 is not twisted, dropped, or damaged.

As shown in FIG. 5B, one first waist wall portion 10 may be attached to one column 30. Thereby, workability improves. Alternatively, one first waist wall portion 10 may be attached to the plurality of support columns 30.
The first waist wall portion 10 is not limited to a flat plate shape as shown in FIG. 3, and even if it is a corner waist wall portion 10 ′ that forms a corner of the waist wall 1 as shown in FIG. 1, The present invention is equally applicable. Further, as shown in FIG. 1, the present invention can be similarly applied to the opening waist wall portion 10 ″ that forms the opening of the waist wall 1 on one side instead of the first waist wall portion 10.
The present invention is not limited to the description of the embodiments of the invention and the modifications thereof. Various modifications are also included in the present invention as long as those skilled in the art can easily conceive without departing from the scope of the claims.

DESCRIPTION OF SYMBOLS 1 Waist wall 10 1st waist wall part 10 'Waist wall part 10 "for corner | angular part Waist wall part 11 for opening Upper surface 12, 13, 14 Side 20 Second waist wall part 21 Upper surface 22, 23, 24 Side 30 Post 31 Angle 40 Bolt 51, 52 Adjuster 60 Connecting plate 70 Bolt 80 Packing 91, 92 Bolt 93 Receiving plate 101 Base 102 Floor 111 Insert 131 First concave portion 132, 133, 134 Insert 141 First inclined surface portion 142 First concave groove 211 Insert 231 2nd recessed part 232,233 Insert 241 2nd inclined surface part 242 2nd recessed groove 311 groove | channel

Claims (10)

A construction method for a waist wall including a first waist wall portion and a second waist wall portion,
A first waist wall part attaching step for attaching a plurality of the first waist wall parts to a plurality of struts;
A second waist wall portion attaching step for attaching the second waist wall portion between a plurality of the first waist wall portions;
The construction method of the waist wall, wherein the second waist wall portion is not attached to the support column.   The said 1st waist wall part attachment step is a construction method of the waist wall of Claim 1 which attaches the said some 1st waist wall part to the said some support | pillar by 1-to-1 correspondence. The first waist wall portion is inclined with respect to the extending direction of the waist wall formed by the first waist wall portion and the second waist wall portion on a side surface other than the side surfaces constituting the inner surface and the outer surface of the waist wall. A first inclined surface portion that is a surface portion to be
The second waist wall portion has a second inclined surface portion which is a surface portion inclined with respect to the extending direction of the waist wall on a side surface other than the side surfaces constituting the inner surface and the outer surface of the waist wall,
The first inclined surface portion and the second inclined surface portion face each other when the second waist wall portion is attached to the first waist wall portion by the second waist wall portion attaching step. The construction method of the waist wall of Claim 1 or Claim 2.   The construction method according to claim 3, further comprising a step of attaching a packing to the first inclined surface portion and / or the second inclined surface portion.   The width | variety of the said 1st waist wall part is a construction method of the waist wall as described in any one of Claims 1-4 narrower than the width | variety of the said 2nd waist wall part. A waist wall having a first waist wall portion and a second waist wall portion,
The first waist wall portion is inclined with respect to the extending direction of the waist wall formed by the first waist wall portion and the second waist wall portion on a side surface other than the side surfaces constituting the inner surface and the outer surface of the waist wall. A first inclined surface portion that is a surface portion;
The second waist wall portion has a second inclined surface portion which is a surface portion inclined with respect to the extending direction of the waist wall on a side surface other than the side surfaces constituting the inner surface and the outer surface of the waist wall,
The waist wall in which the first inclined surface portion and the second inclined surface portion face each other.   The waist wall according to claim 6, further comprising a packing sandwiched between the first inclined surface portion and the second inclined surface portion. Further comprising a column for attaching the first waist wall portion,
The waist wall according to claim 6 or 7, wherein the second waist wall portion is not attached to a support column.   The waist wall according to any one of claims 6 to 8, wherein a width of the first waist wall portion is narrower than a width of the second waist wall portion. A first groove is provided on the side surface of the first waist portion, a second groove is provided on the side surface of the second waist portion, and when the side surfaces face each other, The waist wall according to any one of claims 6 to 9, wherein a waterproof construction groove into which a caulking material is driven is formed with the second concave groove.

Images