JP7633197B2 - Water-stopping structure - Google Patents

Description

The present invention relates to a waterproof structure that seals the joints between extruded cement boards.

An extruded cement panel (ECP) is a hollow panel made from cement, calcium silicate, and inorganic fibers, and is used for the exterior walls of buildings. Extruded cement panels are lightweight, yet have excellent strength, weather resistance, fire resistance, and earthquake resistance, and are also aesthetically pleasing and attractive. 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.

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 a water drainage member and various gaskets are placed on the indoor side of the joints.

JP 2019-19562 A

However, the complex waterproofing structure, which is constructed by placing sealants on the exterior side of the extruded cement board and drainage members and gaskets on the interior side, requires cumbersome construction work and is expensive to install.

This leads to a technical problem of providing a water-stopping structure that can be constructed smoothly, and the present invention aims to solve this problem.

In order to achieve the above object, the water-stopping structure according to 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 the adjacent extruded cement boards and including a primary sealant and a water-permeable backup material provided inside the primary sealant, and a secondary water-stopping section provided on the indoor side between the adjacent extruded cement boards and including a secondary sealant and a backup material provided inside the secondary sealant.

According to the present invention, a waterproof structure can be constructed with simple construction.

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. FIG. Cross-sectional view taken along line AA in FIG. FIG. 2 is a plan view showing the structure of an extruded cement board. 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. 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;

One embodiment of the present invention will be described with reference to the drawings. Note that in the following, when referring to the number, numerical value, amount, range, etc. of components, unless otherwise specified or when it is clearly limited to a specific number in principle, it is not limited to that specific number and may be more or less than the specific number.

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

In addition, drawings may exaggerate characteristic parts to make the features easier to understand, and the dimensional ratios of components may not be the same as in reality. 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.

Figure 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 will be a structural member of the building such as the floor, is placed on the beam 2. The exterior wall 1 is constructed by repeating basic units consisting of the beam 2 and the extruded cement board 10.

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. The number and/or type of extruded cement board 10 can be selected from panels of different sizes with different longitudinal dimensions, width dimensions, or thickness dimensions, and can be appropriately selected according to the structure of the building.

The exterior wall 1 shown in Figure 1 is composed of two panels of extruded cement boards 10 that are long in the extrusion direction and six panels of short length. The eight extruded cement boards 10 are attached to the beams 2 perpendicularly to the beams 2.

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 using a "vertical laying method" in which the extrusion direction of the extruded cement boards 10 is vertical. They may also be arranged using 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 the beams 2, which are the structure of the building, by through angles 4. The through angles 4 are made of, for example, L-shaped steel.

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 interior side of the building, so that they can be bundled together. The through angles 4 are fixed to the beams 2, which are the framework of the building.

The through angle 4 is fixed by clamping it between an LZ hardware (Z-shaped clip) 6 (described below) and an extruded cement board 10.

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.

The exterior wall 1 may have an opening in 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 in the building. The exterior wall 1 may have an opening reinforcement material 7 to reinforce the opening in the building.

Figure 2 shows the cross-sectional structure of the exterior wall 1. Figure 3 shows the cross-sectional view taken along line A-A in Figure 2.

The through angle 4 has a vertical section 4a and a horizontal section 4b. The vertical section 4a is fixed to the piece angle 5. The vertical section 4a is interposed between adjacent extruded cement boards 10 in the vertical direction.

The extruded cement board 10 is fixed to the through angle 4 via the LZ hardware 6. The LZ hardware 6 is of known construction 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 passes through 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 mild steel wire. The flat nut 6d is, for example, "ZAM (registered trademark)" by Nisshin Steel Co., Ltd.

The stepped mounting bracket 6a and the 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 the backing plate 6b are also fastened and fixed on the upper side in the vertical direction with a bolt 6c and a flat nut 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.

Next, the water-stopping structure between adjacent extruded cement boards 10 will be explained with reference to the drawings.

As shown in FIG. 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.

The extruded cement board 10 includes boards 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 boards in which the outer wall portion 12 is wider than the inner wall portion 13 as shown in Figures 4 (b) and (c).

The extruded cement board 10 shown in FIG. 4(a) has an outer wall 12 with a thickness t11 of 13 mm, an inner wall 13 with a thickness t12 of 34 mm, and a total thickness T1 of 60 mm. The extruded cement board 10 shown in FIG. 4(b) has an outer wall 12 with a thickness t21 of 28 mm, an inner wall 13 with a thickness t22 of 34 mm, and a total thickness T2 of 75 mm. The extruded cement board 10 shown in FIG. 4(c) has an outer wall 12 with a thickness t31 of 30 mm, an inner wall 13 with a thickness t32 of 45 mm, and a total thickness T3 of 15 mm.

Therefore, for example, when 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 vertically or horizontally, 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 from the extruded cement board 10 with a total thickness of 60 mm, thereby imparting 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 from panels of different sizes having different width dimensions for the exterior wall portion 12 and the interior wall portion 13, and can be appropriately selected according to the structure of the building. Hereinafter, as shown in FIG. 4(a), an outer wall portion 12 and an inner wall portion 13 formed to be of equal thickness will be referred to as an "equal thickness cement board," and as shown in FIG. 4(b) and (c), an outer wall portion 12 formed to be thicker than the inner wall portion 13 will be referred to as a "varying thickness cement board."

At the joints 14, i.e., the vertical joints 15 and horizontal joints 16 that are the gaps between adjacent extruded cement boards 10, a primary water stop section 17 and a secondary water stop section 18 are provided in this order from the outdoor side toward the indoor side. The width of the vertical joints 15 is set to approximately 10 mm, and the width of the horizontal joints 16 is set to approximately 15 mm.

The primary water-stopping section 17 comprises a primary sealing material 17a and a primary backup material 17b arranged adjacent to the indoor side of the primary sealing material 17a.

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.

The primary sealing material 17a and the secondary sealing material 18a are, for example, wet sealing materials, and materials such as urethane-based, acrylic-based, polysulfide-based, silicone-based, and modified silicone-based materials can be used.

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

When extruded cement boards 10 of different total thicknesses are arranged side by side to create unevenness on 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 sections 17. Similarly, it is preferable to provide an L-shaped water-stopping member (not shown) that connects adjacent secondary water-stopping sections 18. This allows the primary water-stopping sections 17 and secondary water-stopping sections 18 to be connected seamlessly even when extruded cement boards 10 of different total thicknesses are arranged side by side.

Next, we will explain the waterproof structure constructed on the outer periphery of the sash 8 that is welded to the opening reinforcement material 7.

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 the side surface 100a of the extruded cement board 100 and the sash 101.

However, to prevent water that has permeated the primary sealing material 102a and the primary back-up material 102b from leaking into the interior, the hollow portion (recess) 100b is filled with a sealing material (not shown), and below the corner of the sash 101, a secondary sealing material 103a and a secondary back-up material 103b are provided between the wall made of the sealing material (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 sealing material 106 is provided between the water drainage member 104 and the through angle 105 and the side 100a of the extruded cement board 100. In other words, the secondary watertightness is divided into two parts, top and bottom, with the corner of the sash 101 as the boundary.

On the other hand, in the water-stopping structure according to this embodiment shown in FIG. 5, a primary water-stopping portion 17 and a secondary water-stopping 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. In other words, the primary water-stopping portion 17 and the secondary water-stopping portion 18 extend seamlessly in the vertical direction.

In this way, the water-stopping structure according to this embodiment is a water-stopping structure that stops water in 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.

With 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 horizontal joints 16, making it possible to construct a double-seal structure with excellent water-stopping properties, which eliminates the need to provide drainage members or gaskets in the vertical joints 15 and horizontal joints 16 of the inner wall section 13, simplifying construction.

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.

In the above embodiment, the primary water stop section 17 and the secondary water stop section 18 are provided on the outer wall section 12 side of the uneven thickness cement board, but the primary water stop section 17 and the secondary water stop section 18 may be provided on the outer wall section 12 side of the uniform thickness cement board.

1: Exterior wall 2: Beam 3: Floor panel 4: Through angle 4a: Vertical section 4b: Horizontal section 5: Piece angle 6: LZ metal fitting 6a: Stepped mounting bracket 6b: Backing plate 6c: Bolt 6d: Flat nut 7: Opening reinforcement material 8: Sash 10: Extruded cement board 10a: Edge bottom surface 10b: Side surface 11: Hollow section 12: Exterior wall section 13: Interior wall section 14: Joint section 15: Vertical joint 16: Horizontal joint 17: Primary water stop section 17a: Primary sealing material 17b: Primary back-up material 18: Secondary water stop section 18a: Secondary sealing material 18b: Secondary back-up material

Claims (2)

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 disposed opposite each other via a hollow portion, 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 watertight section is provided between adjacent extruded cement boards and on the indoor side of the primary watertight section, the secondary watertight 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 . The water-stopping structure according to claim 1, characterized in that the outer wall of the extruded cement board is thicker than the inner wall provided on the indoor side of the outer wall across the hollow space.

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