JP2019031875A - Installation structure of extrusion molding cement plate, and nut for extrusion molding cement plate used in the same - Google Patents

Abstract

To provide installation structure of an extrusion molding cement plate which has high installation stability, does not increase the cost, and can improve durability of the extrusion molding cement plate, and a nut for the extrusion molding cement plate.SOLUTION: Installation structure 1 of an extrusion molding cement plate holds a rear side substrate 2b between an inside and an outside and fastens it by using fastening means 5 engaged to a substrate material 4. The fastening means 5 comprises a nut 6 for the extrusion molding cement plate, a clip 7 including a base part 10 and an engaging part 12, and a mounting bolt 8 for holding the rear side substrate 2b between the nut 6 for the extrusion molding cement plate and the clip 7 to bind them. The nut 6 for the extrusion molding cement plate has first and second contact parts 17 and 18 to be brought into contact with the rear side substrate 2b apart from the center of a bolt hole 15 with a predetermined distance, and brings the first and second contact parts 17 and 18 respectively into contact with the rear side substrate 2b at the position corresponding to outside of the base part 10 of the clip 7 in the longitudinal direction.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an extruded cement board mounting structure for mounting an extruded cement board having a plurality of hollow portions arranged in parallel in one direction to a building frame, and an extruded cement board nut used in the mounting structure. The present invention relates to a mounting structure capable of improving the mounting strength of a molded cement board and obtaining high durability, and an extruded cement board nut.

  Extruded cement boards are widely used as building exterior materials because they are lightweight and have high strength. In the outer wall structure that uses an extruded cement board, generally, the angle that becomes the base material is fixed to the building frame, and the Z clip etc. fastened to the back of the extruded cement board is engaged with the angle, and the extrusion molding is performed. A cement board is attached.

  More specifically, an extruded cement board nut that is provided in the hollow portion of the extruded cement board and is in contact with the back-side base material, and a base part and a base material that are in contact with the outer surface of the back-side base material. The back side base material is sandwiched from inside and outside by a clip having an engaging portion to be joined, and is fastened with a mounting bolt, and the extruded cement board is attached by engaging the engaging portion of the clip with the base material.

  Conventionally, flat square nuts have been widely used as nuts for extruded cement plates. When an extruded cement board is attached as an outer wall of a building and negative pressure is applied to the outer wall, that is, a pressure that pulls the outer wall on the leeward side, a force that pulls out a fastening portion composed of a square nut, a clip, and an attaching bolt acts. When this force is applied, the force transmitted from the clip is received by the square nut in the hollow portion, which is fastened by the mounting bolt.

  Depending on the area where the building is built, the outer wall is exposed to strong wind and rain, and the external environment that the outer wall receives in the high-rise part of the building is more severe than the low-rise part. In particular, since the blindfold wall provided at the top of the building is an open outer wall, the wind pressure on the outer wall is large and the outer wall needs to withstand the wind pressure from the inside. Therefore, depending on the construction location of the outer wall, it is necessary to set the support span of the extruded cement board short, for example, so as not to generate a load exceeding the pulling strength at the fastening part, which increases the cost from the viewpoint of workability and the like. Become.

  The conventional square nut has a flat shape, and when a force is applied to the fastening portion, the drawing load tends to concentrate on the bolt hole formed through the extruded cement plate and the vicinity thereof. If a bolt hole is drilled in the extruded cement board and the cut pieces remain between the square nut and the extruded cement board, the force may not be applied evenly. Due to this cause, the pull-out load may be easily concentrated, so that precise work is required.

  Although there were no problems in performance such as durability and functionality of flat-shaped square nuts, in recent years, the building has become higher-rise, and higher safety and workability have been demanded. For example, Patent Document 1 discloses a square nut in which a pair of raised members are fixed along a short direction of a hollow portion of an extrusion-molded cement plate. A structure to be installed in a hollow portion through a member is described.

JP-A-9-060192

  In the above structure using the square nut with the raised member fixed, it is difficult to apply a force to the bolt hole and its vicinity, and a certain pulling strength can be obtained, but the presence of the raised member may reduce the mounting stability. is there. The reason for this is that the pair of raised members are retrofitted, so if there is a difference in horizontality or height during installation, the square nut will twist when brought into contact with the inside of the hollow portion, and local forces will be generated. This is because it may occur.

  In addition, when the raising member is detached or displaced, there is a possibility that problems such as loosening of the fastening portion may occur. Therefore, it must be manufactured with high accuracy, which takes time and increases the cost.

  In the fastening part of patent document 1, the clip with which a base material is engaged is installed in parallel with the longitudinal direction of the raising member. In this case, there is also a problem that the pulling load acting point on the extruded cement plate when the force that separates the extruded cement plate from the base material is close to the bolt hole, and it is difficult to obtain sufficient pulling strength.

  Therefore, in view of the problems of the prior art, the present invention has high mounting stability and does not increase the cost, and at the same time, it is possible to improve the durability of the extruded cement board by obtaining a high pulling strength of the fastening portion. It is an object of the present invention to provide an extruded cement board mounting structure that can be used, and an extruded cement board nut used in the mounting structure.

  The extruded cement board mounting structure of the present invention sandwiches the back side base material of the extruded cement board in which a plurality of hollow portions formed in a rectangular cross section are arranged in one direction from the inside and outside, and is attached to the building frame. In the mounting structure of the extruded cement plate in which the extruded cement plate is attached to the drive body by the fastening means that engages with the connected base material, the fastening means is provided in the hollow portion and is provided on the back side. Extruded cement board nut that is in contact with the base material, a base part that is in contact with the outer surface of the back side base material, and extending from the base part toward the base material side along the longitudinal direction of the hollow part A clip composed of an engaging portion that constitutes an engagement gap to be engaged with the base material, and a bolt hole formed in the back side base material, the back side base material being inserted into the extruded cement plate nut and the above Clipped The extrusion-molded cement board nut has a predetermined distance from the center of the bolt hole to both sides in the longitudinal direction in a state where the screw hole and the vicinity thereof are separated from the base material on the back side. 1st and 2nd contact part which contact | abuts to the said back side base material, and the said 1st contact part respond | corresponds to the base material side edge part in the said longitudinal direction of the base of the said clip, or its outer side The second contact portion is in contact with the back-side base material at a position corresponding to the base material opposite end or the outside thereof in the longitudinal direction of the base portion of the clip. Mounting structure.

  In the extrusion-molded cement board mounting structure of the present invention, the extrusion-molded cement board nut has first and second contact portions that separate the screw holes and the vicinity thereof from the back-side base material. Since it is not made to contact in the hollow part of an extrusion-molded cement board through the body raising member, attachment stability becomes high. The first and second abutting portions of the extruded cement plate nut do not come off or shift, and do not cause problems such as loosening of the fastening portion. For this reason, it is easy to manufacture an extruded cement board nut, and it does not take time and effort, so the cost is not increased.

  The first and second contact portions of the extruded cement plate nut contact the back side base material at a predetermined distance from the center of the bolt hole of the back side base material on both sides in the longitudinal direction of the hollow portion. The base portion is in contact with the outer surface of the back-side base material, and the engaging portion extends from the base portion toward the base material side along the longitudinal direction of the hollow portion. That is, in the structure of the present invention, the clip that is engaged with the base material is not installed in the direction parallel to the longitudinal direction of the raising member as in the conventional case, but the longitudinal direction in which the engaging portion of the clip exists on one end side. The first and second contact portions of the extrusion-molded cement board nut are positioned at a predetermined distance before and after the direction.

  Therefore, do not receive the pulling load to the extrusion-molded cement board when the force pulled away from the base material is applied to the abutting part orthogonal to the longitudinal direction, instead of receiving it at the part parallel to the longitudinal direction of the hollow part. become. In this case, the point of action of the pull-out load on the extrusion-molded cement board is far from the bolt hole toward the base material side, and at the same time, when the external force that separates the extrusion-molded cement board from the base material occurs, Approaching the generated force point, the pulling strength of the fastening portion can be improved.

  The first abutting portion abuts against the back-side base material on the bolt hole side of the force point generated in the engaging portion of the clip when an external force that separates the extruded cement board acts on the base material. It is preferable. In this case, a high pulling strength of the fastening portion can be obtained effectively.

  The first and second contact portions may be in contact with the back side base material of the extruded cement board in a line shape, or in a surface shape or a dot shape.

  In the extruded cement plate nut, a distance from the center of the screw hole to the first contact portion may be larger than a distance to the second contact portion. By applying an extruded cement board nut in which the distance from the center of the screw hole to the first contact part is larger than the distance to the second contact part, the degree of freedom in designing the extruded cement board is increased. be able to.

  The nut for an extruded cement board of the present invention is for fastening an extruded cement board in which a plurality of hollow portions formed in a rectangular cross section are arranged in one direction to a base material connected to a building frame. An extruded cement plate nut used in an extruded cement plate mounting structure and provided in the hollow portion and abutting against a back side base material of the extruded cement plate, wherein the extruded cement plate mounting structure Is a mounting structure for an extruded cement board according to any one of the above.

  The nut for an extrusion-molded cement board of the present invention has first and second contact portions that separate the screwing hole and the vicinity thereof from the back-side base material, and is extruded through a separate raising member. Since it is not a thing contact | abutted in the hollow part of a cement board, attachment stability becomes high. The first and second abutting portions of the extruded cement plate nut do not come off or shift, and do not cause problems such as loosening of the fastening portion. For this reason, it is easy to manufacture an extruded cement board nut, and it does not take time and effort, so the cost is not increased.

  The first and second contact portions of the extruded cement plate nut contact the back side base material at a predetermined distance from the center of the bolt hole of the back side base material on both sides in the longitudinal direction of the hollow portion. The base portion is in contact with the outer surface of the back-side base material, and the engaging portion extends from the base portion toward the base material side along the longitudinal direction of the hollow portion. That is, in the structure of the present invention, the clip that is engaged with the base material is not installed in the direction parallel to the longitudinal direction of the raising member as in the conventional case, but the longitudinal direction in which the engaging portion of the clip exists on one end side. The first and second contact portions of the extrusion-molded cement board nut are positioned at a predetermined distance before and after the direction.

  Therefore, do not receive the pulling load to the extrusion-molded cement board when the force pulled away from the base material is applied to the abutting part orthogonal to the longitudinal direction, instead of receiving it at the part parallel to the longitudinal direction of the hollow part. become. In this case, the point of action of the pull-out load on the extrusion-molded cement board is far from the bolt hole toward the base material side, and at the same time, when the external force that separates the extrusion-molded cement board from the base material occurs, Approaching the generated force point, the pulling strength of the fastening portion can be improved.

  In the extruded cement plate nut, the first and second contact portions constituting the extruded cement plate mounting structure are formed of outer ends of bent portions that are bent toward the back-side base material. If so, it is possible to easily produce an extrusion-molded cement board nut and to obtain high reliability.

  According to the present invention, the extrusion-molded cement board nut has the first and second contact portions that separate the screwing hole and the vicinity thereof from the back-side base material, so that the mounting stability is improved. . The extrusion-molded cement board nut having the first and second abutting portions is easy to manufacture and does not take time and thus does not increase costs.

  The drawing load applied to the extruded cement board when a force is pulled away from the base material is not received at the part parallel to the longitudinal direction, but at each abutting portion orthogonal to the longitudinal direction. The point of action of the drawing load on the molded cement board is farther from the bolt hole toward the base material side, so that a high pulling strength of the fastening part can be obtained, and the fastening durability of the extruded cement board is greatly improved Can do.

It is sectional drawing which shows the attachment structure of the extrusion-molded cement board which concerns on 1st Embodiment of this invention. It is a perspective view of the nut for extrusion molding cement boards used for the attachment structure of an extrusion molding cement board. (A) is a side view of the nut for extrusion-molded cement boards, (b) is a plan view. It is explanatory drawing of how to apply the load in the attachment structure of an extrusion-molded cement board. It is explanatory drawing of how to apply the load in the conventional attachment structure of an extrusion-molded cement board. It is sectional drawing of the orthogonal | vertical direction which applied the attachment structure of the extrusion-molded cement board to the vertically-long attachment structure. It is the sectional view on the AA line of FIG. It is sectional drawing which shows the attachment structure of the extrusion-molded cement board which concerns on 2nd Embodiment of this invention. (A) is a side view of the nut for extrusion-molded cement boards used for the attachment structure of FIG. 8, (b) is a top view. It is a modification of the nut for extrusion-molded cement boards.

  Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view showing an extruded cement board mounting structure 1 according to a first embodiment of the present invention. An extruded cement board 2 used in the extruded cement board mounting structure 1 is manufactured by extruding a mixture of cement, aggregate, fiber, admixture, water, etc. with an extruder and cutting it to a predetermined size. It has been done. In the extruded cement board 2, a plurality of hollow portions 3 formed in a rectangular cross section are configured in parallel to each other in the longitudinal direction that is the extrusion direction. By forming the plurality of hollow portions 3, a plurality of partition walls 2 c that connect the surface-side base material 2 a and the back-side base material 2 b of the extruded cement plate 2 are formed.

  The extrusion-molded cement board mounting structure 1 includes an extrusion-molded cement board by a fastening means 5 that sandwiches the back-side base material 2b of the extrusion-molded cement board 2 from inside and outside and engages with a base material 4 connected to a building frame. An attachment structure for fastening the plate 2 to the base material 4. The fastening means 5 is provided in the hollow portion 3 and is in contact with the base material 4 while being in contact with the outer surface of the back side base material 2b and the extruded cement board nut 6 being in contact with the back side base material 2b. And a mounting bolt 8 that penetrates through a through hole 7a formed in the clip 7 and is screwed to the extruded cement board nut 6.

  The clip 7 has a base 10 that is in contact with the outer surface of the back-side base material 2b, and an engagement gap that extends from the base 10 toward the base material along the longitudinal direction of the hollow portion and engages with the base material 4. 11 and an engaging portion 12 that constitutes 11. The mounting bolt 8 penetrates the through hole 7a of the base 10 and the bolt hole 15 of the back side base material 2b in the state where the spring washer 13 and the washer 14 are assembled from the back side of the back side base material 2b. Are screwed into the screw holes 6a of the extrusion-molded cement board nut 6. The extrusion-molded cement board nut 6 and the clip 7 are fastened by the mounting bolt 8 so as to sandwich the back-side base material 2 b of the extrusion-molded cement board 2.

  For example, the extrusion-molded cement board 2 is attached as follows. An extruded cement plate nut 6 is disposed in the hollow portion 3 of the extruded cement plate 2, the mounting bolt 8 is passed through the clip 7 and the back side base material 2 b, and the rear surface is formed by the clip 7 and the extruded cement plate nut 6. The side base material 2b is sandwiched and the mounting bolt 8 is tightened to temporarily fix the clip 7. The base material 4 fixed on the housing side is engaged with the temporarily fixed clip 7 to further tighten the mounting bolt 8, and the base material 4 and the back-side base material 2 b are sandwiched, whereby the base material 4 is extruded with cement. The board 2 is fastened.

  FIG. 2 is a perspective view of the extruded cement board nut 6. Fig.3 (a) is a side view of the nut 6 for an extrusion-molded cement board, (b) is a top view. The extrusion-molded cement board nut 6 is manufactured by bending a metal plate having a required thickness in a rectangular shape in plan view by pressing, and is used in the same manner as a normal flat-molded extrusion-molded cement board nut. Can be used.

  The extrusion-molded cement board nut 6 has a predetermined distance from the center of the bolt hole 15 of the back side base material 2b to the both sides in the longitudinal direction with the screw hole 6a and the vicinity thereof being separated from the back side base material 2b. It has the 1st and 2nd contact parts 17 and 18 contact | abutted to the back side base material 2b. These 1st and 2nd contact parts 17 and 18 consist of the outer end part of the bending part 19 bent toward the back side base material 2b. Thereby, the nut 6 for extrusion-molded cement boards can be produced easily and high reliability can be obtained.

  When the mounting bolt 8 is tightened, only the first and second contact portions 17 and 18 of the extrusion-molded cement board nut 6 come into linear contact with the back-side base material 2b and press the back-side base material 2b. Then, the clip 7 is fastened to the back side substrate 2b. The extrusion-molded cement board nut 6 is in line contact with the back-side substrate 2b only at the corners of the short pieces on both sides, which are the first and second contact portions 17 and 18.

  The first abutting portion 17 abuts the back-side base material 2 b at a position corresponding to the outside of the base material side end portion 10 a in the longitudinal direction of the base portion 10 of the clip 7, and the second abutting portion 18 is the longitudinal length of the base portion 10. In contact with the back side substrate 2b at a position corresponding to the outside of the base material opposite side end 10b in the direction. The first contact portion 17 may be in contact with the back-side base material 2 b at a position corresponding to the base material side end portion 10 a in the longitudinal direction of the base portion 10 of the clip 7, and the second contact portion 18 may be in contact with the base portion 10. You may contact | abut to the back side base material 2b in the position corresponding to the base material opposite side edge part 10b in a longitudinal direction.

  FIG. 4 is an explanatory view of how to apply a load in the extruded cement board mounting structure 1, and FIG. 5 is an explanatory view of a conventional method of applying a load in the extruded cement board mounting structure 100. In FIG. 5, members that are the same as those in FIG. When an external force that pulls the extruded cement board 2 away from the base material 4 is generated, this external force generates a force point P1 at the engaging portion 12 of the clip 7. The upward arrows in these figures indicate the force point P1 generated in the engaging portion 12 of the clip 7 when an external force that pulls the extruded cement plate 2 away from the base material 4 is generated. When the force point P <b> 1 is generated in the clip 7, the base material opposite end 10 b of the base portion 10 of the clip 7 serves as a fulcrum S, and a pulling force is generated in the mounting bolt 8.

  The downward arrows in FIGS. 4 and 5 are the action points P2 and P3 on the back side substrate 2b. As shown in FIG. 4, when using the extruded cement board nut 6 of this embodiment that linearly contacts the back-side base material 2 b at two locations, the base material opposite side end portion 10 b of the base portion 10 by the force point P <b> 1. The action point P2 comes to the position of the first contact portion 17 away from the fulcrum S. The first contact portion 17 serving as the action point P2 is in contact with the back-side base material 2b on the bolt hole 15 side of the force point P1.

  As shown in FIG. 5, when the conventional flat extrusion-molded cement board nut 101 is used, the extrusion-molded cement board nut 101 abuts the back-side base material 2b in a planar shape, so that the load is flat. I can receive it. At that time, the force applied to the back side base material 2b at the fulcrum S becomes zero and gradually increases toward the force point P1. As shown in the figure, the distribution of the strength of the force applied to the back side substrate 2b is a triangle, and the action point P3 is the center of gravity of this triangle. Thus, the action point P2 shown in FIG. 4 according to the present embodiment is farther from the bolt hole 15 than the conventional action point P3.

  If the nut 6 for extrusion-molded cement board of this embodiment is used, the action point P2 of the drawing load to the extrusion-molded cement board 2 will be farther than before from the bolt hole 15 toward the base material side, It comes closer to the power point P1 than before.

  4 and 5 show an example in which the distance from the fulcrum S to the ends of the extrusion-molded cement board nuts 6 and 101 is 50 mm. In the embodiment of the present invention shown in FIG. 4, the distance from the fulcrum S to the action point P2, which is the position of the first contact portion 17 of the extruded cement plate nut 6, is 50 mm. In the conventional example shown in FIG. 5, the distance from the fulcrum S to the action point P3 is 33.3 mm.

  Therefore, the magnitude of the force generated at the action points P2 and P3 by the force point P1 is P2 = (50 + 35) /50=1.70P1 in the case of FIG. In this case, P3 = (33.3 + 51.2) /33.3=2.54P1. That is, the magnitude of the force at the action point P2 of the present embodiment is 1.70 / 2.54 = 0.669 times the magnitude of the force at the conventional action point P3, which is about 33% less than the conventional value. . By using the extrusion-molded cement board nut 6 of this embodiment, the stress which generate | occur | produces in the extrusion-molded cement board 2 always can be reduced.

  As an example, a breaking load was measured by a pull-out test in which an upward load on the paper surface was applied to the base material 4 of FIGS. 4 and 5. In the pull-out test using the extrusion-molded cement board nut 6 of the present embodiment, the breaking load averages 7.36 kN, and in the pull-out test using the conventional extrusion-molded cement board nut 101, the breaking load averages 5. 18 kN. In the nut 6 for an extrusion-molded cement board of the present embodiment, a breaking load that is 1.42 times the conventional value was shown by comparison of average values.

  FIG. 6 is a vertical cross-sectional view in which the extruded cement board mounting structure 1 of the above embodiment is applied to a vertically stretched mounting structure, and FIG. 7 is a cross-sectional view taken along line AA in FIG. A first fastening part 25 for fastening the upper extruded cement board 2 at the joint and a second fastening part 26 for fastening the lower extruded cement board 2 are provided. Brackets 28 are fixed to the embedded anchor 42 of the building body 27 at regular intervals, and a first angle 29 having an L-shaped cross section that is continuous in the horizontal direction is fixed to the bracket 28. Rock wool 30 or the like is filled between the drive body 27 and the lower extruded cement plate 2. On the horizontal plane of the first angle 29, a plurality of second angles 31 having an L-shaped cross section aligned in the horizontal direction are fixed at regular intervals.

  In the first fastening portion 25, a base angle 32 having an L-shaped cross section that is continuous in the horizontal direction is fixed as a base material on the vertical surfaces of the plurality of second angles 31. The engaging portion 12 of the clip 7 is engaged with the base angle 32 in a state where the packing 33 and the gasket 34 are sandwiched between the back-side base material 2 b of the upper extruded cement board 2 and the base angle 32.

  In the hollow portion 3 of the upper extruded cement plate 2, an extruded cement plate nut 6 is provided with the first and second contact portions 17 and 18 positioned vertically. Accordingly, the longitudinal direction of each contact portion 17, 18 is orthogonal to the longitudinal direction of the hollow portion 3. The clip 7 is of a type in which two screw holes 6a for screwing two mounting bolts 8 are formed as shown in FIG.

  A packing 35 and a draining material 36 are provided between the base angle 32 and the lower end of the extruded cement board 2. Rock wool 37 or the like is filled between the base angle 32 and the upper end of the lower extruded cement board 2. A backup member 38 and an outer sealing member 39 are provided at the joint between the upper and lower extruded cement boards. Further, a gasket 40 is installed between the back-side base material 2 b of the extruded cement board 2 and the base angle 32. The mounting bolt 8 penetrating the clip 7 and the back-side base material 2 b is screwed into the extrusion-molded cement board nut 6, and the clip 7 is tightened with the base angle 32 engaged.

  The first angle 29 fixed to the bracket 28 is a base material for the clip 7 of the second fastening portion 26. In the hollow portion 3 of the lower extruded cement plate 2, an extruded cement plate nut 6 is provided with the first and second contact portions 17 and 18 positioned vertically. Accordingly, the longitudinal direction of each contact portion 17, 18 is orthogonal to the longitudinal direction of the hollow portion 3. The mounting bolt 8 penetrating the clip 7 and the lower back-side base material 2b is screwed into the extrusion-molded cement board nut 6, and the clip 7 is tightened with the slide stopper 41 sandwiched and engaged with the first angle 29 It has been. The slide stopper 41 is fixed to the first angle 29 by welding to prevent lateral displacement of the extruded cement board 2. With such a vertically stretched structure, the upper and lower extruded cement plates 2 and 2 are fastened to the building body 27.

  In the extruded cement board mounting structure 1 of the present embodiment, the extruded cement board nut 6 includes first and second contact portions 17 that separate the screw holes 6a and the vicinity thereof from the back-side base material 2b, 18 and is not brought into contact with the hollow portion of the extrusion-molded cement board via a separate raising member, so that the mounting stability is improved.

  The first and second contact portions 17 and 18 included in the extruded cement plate nut 6 do not come off or shift and do not cause problems such as loosening of the fastening portion. For this reason, it is easy to manufacture the nut 6 for an extrusion-molded cement board, and it does not take time and effort, so the cost is not increased.

  The first and second contact portions 17 and 18 of the extruded cement plate nut 6 are arranged on the back side base with a predetermined distance from the center of the bolt hole 15 of the back side base material 2b on both sides in the longitudinal direction of the hollow portion 3. The clip 7 is in contact with the material 2b. The base 10 is in contact with the outer surface of the back-side base material 2b, and the engaging portion is extended from the base 10 toward the base material side along the longitudinal direction of the hollow portion. Twelve.

  That is, in the structure of the present invention, the clip 12 to be engaged with the base material is not installed in the direction parallel to the longitudinal direction of the raising member as in the prior art, but the engaging portion 12 of the clip 7 exists on one end side. The first and second contact portions 17 and 18 of the extruded cement board nut 6 are positioned at a predetermined distance before and after in the longitudinal direction. Each contact perpendicular to the longitudinal direction does not receive the pulling load to the extruded cement plate 2 when an external force for separating the extruded cement plate 2 from the base material 4 occurs. Part 17 and 18 will receive.

  In this case, the action point P2 of the pulling load on the extruded cement plate 2 becomes farther from the bolt hole 15 toward the base material side, and at the same time, an external force for pulling the extruded cement plate 2 away from the base material 4 is generated. It approaches the force point P1 generated in the clip 7 when it is pulled, and the pulling-out strength of the fastening portion can be improved. The stress that is always generated in the portion sandwiched between the clip 7 and the extrusion-molded cement board nut 6 in the back-side base material 2b can be kept small.

  Thereby, in the use of the extrusion-molded cement board 2 over a long period of time, stable fastening can be realized, and the fastening durability can be remarkably improved. As a result, a decrease in functionality due to defects such as cracks in the extruded cement board 2 is suppressed, and extremely high reliability with respect to the outer wall constituted by the extruded cement board 2 can be obtained.

  Since the first contact portion 17 is in contact with the back-side base material 2b on the bolt hole side of the force point P1 generated in the engagement portion 12 of the clip 7, it is possible to effectively obtain a high pulling strength of the fastening portion. Can do.

  For example, in the structure described in Japanese Patent Application No. 2014-261164 filed earlier by the present applicant, an extruded cement plate nut manufactured by bending both sides of a rectangular metal plate in the same direction is used. Abutting portions on both sides of the extrusion-molded cement board nut are linearly contacted with the back-side base material along the longitudinal direction of the hollow portion. By contacting the nut for the extrusion-molded cement board in the vicinity of the partition wall of the hollow portion, the point of action of the force applied to the fastening portion is brought close to the vicinity of the partition wall, and the proof stress is improved.

  Depending on the surface shape of the extruded cement board, the width of the hollow portion may be narrowed in order to maintain the shape. When the above extruded cement plate nut is applied to an extruded cement plate with a narrow hollow portion, the contact portions at both ends of the nut approach the bolt holes on the back side base material, and the desired yield strength can be obtained. It may not be possible. The width of the extrusion-molded cement board nut becomes narrow, which causes a decrease in yield strength.

  The support span, which is the workable dimension of the extruded cement board, is determined by three factors: strength, rigidity, and fastening strength of the extruded cement board. The fastening strength of the three elements greatly affects the negative pressure of the extruded cement plate, and the use limit is determined by the size of the fastening strength, which determines whether or not the extruded cement plate can be used.

  When using an extruded cement board with a narrow hollow part in a high-rise building where wind pressure and negative pressure are generated, the above-mentioned type in which the nut for the extruded cement board abuts near the partition is supported. Hard to do. Even with an extruded cement board having a narrow hollow part, stable fastening can be realized by applying the mounting structure 1 using the extruded cement board nut 6 of this embodiment, and the fastening durability is remarkably improved. Can be improved.

  FIG. 8 is a sectional view showing an extruded cement board mounting structure 50 according to the second embodiment of the present invention. Fig.9 (a) is a side view of the nut 51 for an extrusion-molded cement board used for the attachment structure 50 of FIG. 8, (b) is a top view. The different point of this embodiment is that the extrusion-molded cement board nut 51 is longer in the longitudinal direction than that of the first embodiment, and the screwing hole 51a is shifted from the longitudinal center to one side. In addition, the same code | symbol is attached | subjected and demonstrated to the member which is common in 1st Embodiment.

  As shown in FIG. 8, a distance a from the center of the bolt hole 15 of the back-side base material 2 b to the first contact portion 17 of the extruded cement plate nut 51 is a distance b to the second contact portion 18. Is bigger than. That is, the extrusion-molded cement board nut 51 has a distance a from the center of the screw hole 51a to the first contact portion 17 larger than a distance b to the second contact portion 18. By making the nut 51 for cement board applicable, the freedom degree of design of the extrusion-molded cement board 2 can be raised.

  When the distance from the center of the through hole 7a of the clip 7 to the force point P1 is A and the distance to the clip tail 7b is B, the first contact portion from the center of the screw hole 51a of the extruded cement board nut 51 The range of the distance a to 17 is B to A, and the range of the distance b to the second contact portion 18 is B or more.

  By adopting these dimensions, it is possible to manufacture the most effective extruded cement board nut 51 from the viewpoint of the pulling strength. However, when the distance a from the screwing hole 51a of the extrusion-molded cement board nut 51 to the first contact portion 17 is increased, the extrusion is performed when the mounting bolt 8 is tightened or with a force transmitted from the mounting bolt 8. It is necessary to increase the thickness so that the cement board nut 51 is not deformed.

  For example, if the size of a conventional flat extruded cement board nut is 30 mm wide × 60 mm long, the cost is equal and the extruded cement board nut of the present invention is improved in yield strength. The size is about 35 mm wide × 60 mm long. On the other hand, in the case of the nut for an extrusion-molded cement board according to the present invention in which proof stress is emphasized, a preferable size is 35 to 45 mm in width × 60 × 100 mm in length.

  The present invention is not limited to the above embodiment. The disclosed embodiment is an illustration of an extruded cement board mounting structure and an extruded cement board nut according to the present invention, and is not restrictive. The vertically attached structure and the horizontally attached structure to which the extruded cement board attaching structure of the present invention is applied are not limited. The mounting structure of the extruded cement board and the nut for the extruded cement board according to the present invention can be modified within the technical scope described in the claims.

  As a modification of the nut for an extrusion-molded cement board, for example, the one shown in FIG. The extrusion-molded cement board nut 52 shown in the figure is manufactured by bending four corners of a rectangular square nut in the same direction. In this extrusion-molded cement board nut 52, the two protrusions on one short side are first contact parts 53, 53, and the two protrusions on the other short side are second contact parts 54, 54. It becomes. With the long side 52a of the extrusion-molded cement board nut 52 along the longitudinal direction of the hollow part, the extrusion-molded cement board nut 52 is brought into contact with the back side substrate from the inside of the hollow part. Such an extrusion-molded cement board nut 52 can be adopted according to the construction specifications of the extrusion-molded cement board.

  The clip, the mounting bolt, and other members provided as necessary for the extruded cement board mounting structure may be in any form as long as the effects of the present invention are not impaired.

DESCRIPTION OF SYMBOLS 1 Extrusion-molded cement board attachment structure 2 Extrusion-molded cement board 2b Surface side base material 3 Hollow part 4 Base material 5 Fastening means 6 Extruded cement board nut 6a Screwing hole 7 Clip 7a Through-hole 8 Mounting bolt 10 Base 11 Engagement gap 12 Engagement part 15 Bolt hole 17 First abutment part 18 Second abutment part 19 Bending part 25 First fastening part 26 Second fastening part 27 Rotor 28 Bracket 29 First angle 31 Second angle 32 Base angle 50 Extruded cement board mounting structure 51, 52 Extruded cement board nut 53 First abutment part 54 Second abutment part P1 Force point S Support point P2, P3 Action point

Claims (6)

A fastening means for sandwiching a back side base material of an extruded cement board in which a plurality of hollow portions formed in a rectangular section are arranged in parallel in one direction and engaging with a base material connected to a housing of a building In the mounting structure of the extruded cement plate for mounting the extruded cement plate to the body,
The fastening means is:
An extrusion cement plate nut provided in the hollow portion and in contact with the back-side base material;
A base portion that is in contact with the outer surface of the back-side base material, and an engagement portion that forms an engagement gap that extends from the base portion toward the base material side along the longitudinal direction of the hollow portion and engages with the base material. A clip consisting of
A mounting bolt that penetrates through the bolt hole formed in the back side base material and fastens the back side base material so as to be sandwiched between the extruded cement plate nut and the clip, and
The extrusion-molded cement board nut contacts the back-side base material with a predetermined distance from the center of the bolt hole to both sides in the longitudinal direction with the screw hole and the vicinity thereof being separated from the back-side base material. Having first and second contact portions in contact with each other;
The first abutting part abuts the base material side end of the base of the clip in the longitudinal direction or a position corresponding to the outside thereof, and the second abutting part is the base of the clip. The mounting structure of the extrusion-molded cement board which contact | abuts to the said back side base material in the position corresponding to the base material opposite side edge part in the said longitudinal direction or the outer side.   The first abutting portion abuts against the back-side base material on the bolt hole side of the force point generated in the engaging portion of the clip when an external force that separates the extruded cement board acts on the base material. The extrusion-molded cement board mounting structure according to claim 1.   The extruded cement board attachment structure according to claim 1 or 2, wherein the first and second contact portions are in contact with the back-side base material in a linear shape, a planar shape, or a dot shape.   The distance from the center of the said screwing hole to the said 1st contact part in the said nut for extrusion molding cement boards is larger than the distance to the said 2nd contact part. Extruded cement board mounting structure. Used for an extruded cement board mounting structure to fasten an extruded cement board with a plurality of hollow sections formed in a rectangular cross-section in one direction to a base material connected to the building frame. A nut for an extruded cement plate provided in the hollow portion and abutting on the back side substrate of the extruded cement plate,
The extruded cement board nut, wherein the extruded cement board mounting structure is the extruded cement board mounting structure according to any one of claims 1 to 4.   In the extruded cement plate nut, the first and second contact portions constituting the extruded cement plate mounting structure are formed of outer ends of bent portions that are bent toward the back-side base material. The nut for an extrusion-molded cement board according to claim 5.

Images