Water-stopping structure

Abstract

To provide a water cut-off structure allowing easy construction thereof.SOLUTION: A water cut-off structure cutting off water in a vertical joint 15 and a horizontal joint 16 between extrusion molded cement plates 10 adjacent to each other is provided on an outdoor side between the adjacent extrusion molded cement plates 10, and comprises: a first cut-off part 17 provided with first sealing material 17a and first back-up material 17b disposed inside of the first sealing material 17a; and a second cut-off part 18 disposed between the adjacent extrusion molded cement plates 10 and inside of the first cut-off part 17, and provided with second sealing material 18a and second back-up material 18b disposed inside of the second sealing material 18.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a waterproof structure for sealing joints between extruded cement boards. [Background technology]

[0002] Extruded cement panels (ECPs) are panels made from cement, calcium silicate, and inorganic fibers extruded into a hollow plate shape, and are used for the exterior walls of buildings. Extruded cement panels are lightweight, yet have excellent strength, weather resistance, fire resistance, and earthquake resistance, as well as aesthetics and design. Known types of extruded cement panels include flat panels with a smooth surface, design panels with ribbed or embossed patterns on the surface, and tile-based panels with grooves on the surface for attaching tiles.

[0003] Patent Document 1 discloses a waterproof structure in which a sealant and backup material are placed on the outdoor side of the joints between extruded cement boards stacked vertically above each other, and water drainage members and various gaskets are placed on the indoor side of the joints. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2019-19562 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, the complex waterproofing structure, which is constructed by placing sealants, etc. on the outdoor side of the extruded cement board and waterproofing members, gaskets, etc. on the indoor side, requires complicated construction work and has high construction costs.

[0006] Therefore, a technical problem arises that must be solved, which is to provide a waterproof structure that can be constructed smoothly. An object of the present invention is to solve this problem. [Means for solving the problem]

[0007] In order to achieve the above-mentioned object, the water-stopping structure of the present invention is a water-stopping structure for stopping water in the joints between adjacent extruded cement boards, and is configured to include a primary water-stopping section provided on the outdoor side between adjacent extruded cement boards and comprising a primary sealant and a water-permeable backup material provided inside the primary sealant, and a secondary water-stopping section provided between adjacent extruded cement boards and on the indoor side of the primary water-stopping section and comprising a secondary sealant and a backup material provided inside the secondary sealant. Effect of the Invention

[0008] According to the present invention, a waterproof structure can be constructed with simple construction. [Brief description of the drawings]

[0009] [Figure 1] 1 is a schematic diagram of an exterior wall to which a waterproof structure according to one embodiment of the present invention is applied, viewed from the indoor side. [Diagram 2] FIG. [Diagram 3] Cross-sectional view taken along line AA in Figure 2. [Figure 4] FIG. 2 is a plan view showing the structure of an extruded cement board. [Diagram 5] 1 is a perspective view and a longitudinal cross-sectional view showing a water-stopping structure constructed around the outer periphery of an opening reinforcement material. [Figure 6] 1A and 1B are a perspective view and a longitudinal sectional view showing a conventional water-stopping structure constructed around the outer periphery of an opening reinforcement material; DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] An embodiment of the present invention will be described with reference to the drawings. In the following, when the number, numerical value, amount, range, etc. of components are mentioned, the number is not limited to the specific number, and may be more or less than the specific number, unless otherwise specified or when it is clearly limited to a specific number in principle.

[0011] In addition, when referring to the shape or positional relationship of components, etc., this includes things that are substantially similar or approximate to those shapes, etc., unless otherwise specified or considered to be clearly different in principle.

[0012] In addition, the drawings may exaggerate characteristic parts to make the features easier to understand, and the dimensional ratios of the components may not be the same as the actual ones. In addition, in cross-sectional views, hatching of some components may be omitted to make the cross-sectional structure of the components easier to understand.

[0013] Fig. 1 is a schematic diagram of an exterior wall 1 to which a waterproof structure according to this embodiment is applied, viewed from the building (indoor) side. The exterior wall 1 comprises a beam 2 which is the framework of the building, and an extruded cement board 10 fixed to the beam 2. The beam 2 is made of, for example, H-shaped steel. A floor panel 3 which serves as a structural member for the building's floor, etc. is placed on the beam 2. The exterior wall 1 is constructed by repeating basic units each consisting of the beam 2 and the extruded cement board 10.

[0014] The extruded cement board 10 is a panel formed in a generally rectangular shape with the long axis in the extrusion direction and the short axis in the width direction. At least one of the number and type of the extruded cement board 10 can be selected from panels of different sizes in the longitudinal dimension, width dimension, or thickness, and appropriately selected according to the structure of the building.

[0015] The exterior wall 1 shown in Fig. 1 is composed of two panels of long type and six panels of short type, each having a length in the extrusion direction of the extruded cement board 10. The eight extruded cement boards 10 are attached to the beams 2 perpendicularly to the beams 2.

[0016] The multiple extruded cement boards 10 may be arranged in a vertical plane relative to the ground along the structure of the building, and may be arranged by a "vertical laying method" in which the extrusion direction of the extruded cement boards 10 is vertical. Alternatively, the multiple extruded cement boards 10 may be arranged by a "horizontal laying method" in which the extrusion direction of the extruded cement boards 10 is horizontal. The multiple extruded cement boards 10 are each attached to a beam 2, which is the structure of the building, by a through angle 4. The through angle 4 is made of, for example, an L-shaped steel material.

[0017] The through angles 4 are attached to the upper and lower ends of the extruded cement boards 10 arranged vertically along the beams 2, on the indoor side of the building, so as to bundle together the multiple extruded cement boards 10. The through angles 4 are fixed to the beams 2, which are the framework of the building.

[0018] The through angle 4 is clamped and fixed between an LZ metal fitting (Z-shaped clip) 6 (described later) and an extruded cement board 10.

[0019] If necessary, an L-shaped piece angle 5 fixed to the through angle 4 may be attached to the center of the width of the extruded cement board 10 to strengthen and stabilize the attachment between the beam 2 and the extruded cement board 10.

[0020] The exterior wall 1 may have an opening for the building formed by the bottom edge surface 10a in the width direction of the extruded cement board 10 and the side surface 10b in the extrusion direction of the wall panel. This opening is used as a window frame or the like for the building. The exterior wall 1 may have an opening reinforcement material 7 for reinforcing the opening for the building.

[0021] Fig. 2 is a diagram showing a cross-sectional structure of the exterior wall 1. Fig. 3 is a cross-sectional view taken along line AA in Fig. 2.

[0022] The through angle 4 has a vertical portion 4a and a horizontal portion 4b. The vertical portion 4a is fixed to the piece angle 5. The vertical portion 4a is interposed between the extruded cement boards 10 adjacent to each other in the vertical direction.

[0023] The extruded cement board 10 is fixed to the through angle 4 via the LZ hardware 6. The LZ hardware 6 is of known configuration and includes a stepped mounting bracket 6a with a gently Z-shaped cross section, a backing plate 6b, a bolt 6c, and a flat nut 6d. The LZ hardware 6 and the extruded cement board 10 are fixed together by fitting the bolt 6c into a hole that penetrates the LZ hardware 6 and the extruded cement board 10. The stepped mounting bracket 6a and the backing plate 6b are made of SS400. The bolt 6c is made of soft steel wire. The flat nut 6d is, for example, "ZAM (registered trademark)" by Nisshin Steel Co., Ltd.

[0024] The stepped mounting bracket 6a and backing plate 6b are assembled so as to sandwich the through angle 4 on the lower side in the vertical direction. The stepped mounting bracket 6a and backing plate 6b are also fastened and fixed on the upper side in the vertical direction with bolts 6c and flat nuts 6d. As a result, the elastic pressure (spring force) of the stepped mounting bracket 6a acts on the through angle 4, so that the through angle 4 is sandwiched and fixed between the stepped mounting bracket 6a and the backing plate 6b.

[0025] Next, the water-stopping structure between adjacent extrusion molded cement boards 10 will be described with reference to the drawings.

[0026] As shown in Figure 2, the extruded cement board 10 has a hollow portion 11 extending in the vertical direction, an outer wall portion 12 provided on the outdoor side of the hollow portion 11, and an inner wall portion 13 provided on the outdoor side of the hollow portion 11 and connected to the outer wall portion 12.

[0027] Extruded cement boards 10 include those in which the outer wall portion 12 and the inner wall portion 13 are approximately the same size, as shown in Figure 4(a), as well as those in which the outer wall portion 12 is formed wider than the inner wall portion 13, as shown in Figures 4(b) and (c).

[0028] The extruded cement board 10 shown in Fig. 4(a) has a thickness t11 of the outer wall 12 and a thickness t13 of the inner wall 13 of 13 mm, a thickness t12 of the hollow portion 11 of 34 mm, and a total thickness T1 of 60 mm. The extruded cement board 10 shown in Fig. 4(b) has a thickness t21 of the outer wall 12 of 28 mm, a thickness t22 of the hollow portion 11 of 34 mm, a thickness t23 of the inner wall 13 of 13 mm, and a total thickness T2 of 75 mm. The extruded cement board 10 shown in Fig. 4(c) has a thickness t31 of the outer wall 12 of 30 mm, a thickness t32 of the hollow portion 11 of 45 mm, a thickness t33 of the inner wall 13 of 15 mm, and a total thickness T3 of 90 mm.

[0029] Therefore, for example, if an extruded cement board 10 with a total thickness of 90 mm and an extruded cement board 10 with a total thickness of 60 mm are arranged side by side, either above and below or left and right, the distance from the exterior wall portion 12 of the former to the beam 2 is 30 mm longer than the distance from the exterior wall portion 12 to the beam 2 of the latter. Therefore, the extruded cement board 10 with a total thickness of 90 mm protrudes 30 mm forward beyond the extruded cement board 10 with a total thickness of 60 mm, thereby providing unevenness to the surface of the exterior wall 1. At least one of the number and type of extruded cement boards 10 can be selected appropriately according to the structure of the building from panels of different sizes having different width dimensions for the exterior wall portion 12 and the interior wall portion 13. Hereinafter, a board in which the outer wall portion 12 and the inner wall portion 13 are formed to be of equal thickness as shown in FIG. 4(a) will be referred to as an "equal thickness cement board," and a board in which the outer wall portion 12 is formed to be thicker than the inner wall portion 13 as shown in FIGS. 4(b) and (c) will be referred to as a "varying thickness cement board."

[0030] A primary water stop section 17 and a secondary water stop section 18 are provided in this order from the outdoor side to the indoor side at the joints 14, i.e., the vertical joints 15 and horizontal joints 16 which are the gaps between adjacent extruded cement boards 10. The width of the vertical joints 15 is set to about 10 mm, and the width of the horizontal joints 16 is set to about 15 mm.

[0031] The primary waterproofing portion 17 includes a primary sealing material 17a and a primary backup material 17b disposed adjacent to the indoor side of the primary sealing material 17a.

[0032] The secondary water-stopping section 18 includes a secondary sealing material 18a arranged adjacent to the indoor side of the primary water-stopping section 17, and a secondary backup material 18b arranged adjacent to the indoor side of the secondary sealing material 18a.

[0033] The primary sealing material 17a and the secondary sealing material 18a are, for example, wet sealing materials, and may be made of urethane-based, acrylic-based, polysulfide-based, silicone-based, modified silicone-based, or other materials.

[0034] The primary backup material 17b and the secondary backup material 18b are, for example, long members formed to match the dimensions of the vertical joints 15 and the horizontal joints 16, and are formed in a substantially rectangular column shape.

[0035] When extruded cement boards 10 with different total thicknesses are arranged side by side to impart unevenness to the surface of the exterior wall 1, it is preferable to provide an L-shaped water-stopping member (not shown) that connects adjacent primary water-stopping portions 17. Similarly, it is preferable to provide an L-shaped water-stopping member (not shown) that connects adjacent secondary water-stopping portions 18. This allows the primary water-stopping portions 17 and secondary water-stopping portions 18 to be connected seamlessly even when extruded cement boards 10 with different total thicknesses are arranged side by side.

[0036] Next, a waterproof structure constructed on the outer periphery of the sash 8 that is welded to the opening reinforcing member 7 will be described.

[0037] For example, in the conventional waterproof structure shown in FIG. 6, a primary sealing material 102a and a primary backup material 102b are continuously provided from top to bottom on the outdoor side between a side surface 100a of an extruded cement board 100 and a sash 101.

[0038] However, to prevent water that has permeated the primary sealant 102a and the primary backup material 102b from leaking inside the room, the hollow portion (recess) 100b is filled with a sealant (not shown), and below the corner of the sash 101, a secondary sealant 103a and a secondary backup material 103b are provided between the wall made of the sealant (not shown) filled in the recess 100b and the side of the sash 101, and above the corner of the sash 101, an L-shaped sealant 106 is provided between the water drainage member 104 and the through angle 105 and the side 100a of the extruded cement board 100. That is, the secondary side watertightness is divided into two, upper and lower, with the corner of the sash 101 as the boundary.

[0039] 5, a primary water stop portion 17 and a secondary water stop portion 18 are provided in the vertical direction on the outer periphery of the sash 8 between the side surface 10b of the outer wall portion 12 and the sash 8. That is, the primary water stop portion 17 and the secondary water stop portion 18 extend seamlessly in the vertical direction.

[0040] In this way, the water-stopping structure of this embodiment is a water-stopping structure that stops water from entering the vertical joints 15 and horizontal joints 16 between adjacent extruded cement boards 10, and is configured to include a primary water-stopping section 17 that is provided on the outdoor side between adjacent extruded cement boards 10 and includes a primary sealant 17a and a primary backup material 17b provided inside the primary sealant 17a, and a secondary water-stopping section 18 that is provided between adjacent extruded cement boards 10 and on the indoor side of the primary water-stopping section 17 and includes a secondary sealant 18a and a secondary backup material 18b provided inside the secondary sealant 18a.

[0041] According to this configuration, the primary water-stopping section 17 and the secondary water-stopping section 18 are arranged side by side in the vertical joints 15 and the horizontal joints 16, making it possible to construct a double seal structure with excellent water-stopping properties, thereby eliminating the need to provide water-shedding members or gaskets in the vertical joints 15 and horizontal joints 16 of the inner wall section 13, thereby simplifying construction.

[0042] The present invention can be modified in various ways without departing from the spirit of the invention, and it goes without saying that the present invention also covers such modifications.

[0043] In the above-described embodiment, an example was described in which the primary water-stopping portion 17 and the secondary water-stopping portion 18 are provided on the outer wall portion 12 side of a variable thickness cement board, but the primary water-stopping portion 17 and the secondary water-stopping portion 18 may also be provided on the outer wall portion 12 side of a uniform thickness cement board. [Explanation of symbols]

[0044] 1: Exterior wall 2:Beam 3:Floor panel 4:Through angle 4a: Vertical part 4b:Horizontal part 5: Peace Angle 6: LZ hardware 6a: Stepped mounting bracket 6b: Backing plate 6c: Bolt 6d: Flat nut 7: Opening reinforcement material 8: Sash 10: Extruded cement board 10a: Bottom edge 10b: Side 11:Hollow part 12:Outer wall 13: Inner wall 14:Joint part 15: Vertical joint 16: Horizontal joint 17: Primary watertight section 17a: Primary sealant 17b: Primary backup material 18: Secondary watertight section 18a: Secondary sealing material 18b: Secondary backup material

Claims

1. A waterproof structure that is applied to an exterior wall constructed by arranging a plurality of extruded cement boards, each of which has an outer wall portion and an inner wall portion arranged opposite each other with a hollow portion interposed therebetween, and that waterproofs the joints between adjacent extruded cement boards, a primary water-stopping portion provided on the outdoor side between adjacent extruded cement boards and including a primary sealant and a water-permeable backup material provided inside the primary sealant; A secondary water stop section is provided between adjacent extruded cement boards and on the indoor side of the primary water stop section, the secondary water stop section including a secondary sealant and a backup material provided inside the secondary sealant; Equipped with A water-stopping structure characterized in that the primary water-stopping portion and the secondary water-stopping portion are provided between adjacent outer wall portions.

2. 2. The waterproof structure according to claim 1, wherein the outer wall portion of the extruded cement board is formed thicker than the inner wall portion provided on the indoor side of the outer wall portion across the hollow portion.

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