JP4942632B2 - Isobaric joint structure of vertically-extruded cement board - Google Patents

Description

  The present invention relates to an isobaric joint structure of a vertically-extruded cement board, and in particular, in an extruded cement board that has a hollow portion and is difficult to form a shape for securing an isobaric space in a small-mouthed surface in the extrusion direction. The present invention relates to an improved technique for realizing an isobaric joint structure.

  The extrusion-molded cement board is light in weight by having a plurality of hollow portions continuous in the extrusion direction in the width direction, is excellent in fire resistance, and is often used as an outer wall material of a building. When an extruded cement board (hereinafter also simply referred to as “panel”) is attached to a building, a base steel material and a weight receiving member are sequentially attached to the housing, and the panel is attached to the weight receiving member by a Z clip attached to the panel. Joints (horizontal joints and vertical joints) are formed between the extruded cement boards in both the extrusion direction and the width direction. These joints are filled with a sealing material after a packing material is inserted.

  When sealing the joints, the joints are repaired from the outside of the room, and especially in high-rise buildings, the scaffolding cannot be easily provided, making maintenance very difficult, and watertight and airtight performance. There was a problem in maintaining. In particular, in the case of an extrusion-molded cement board, it is thin and has a hollow portion for light weight and high strength, so that it has a W seal necessary for ensuring durability (a sealing material commonly used in precast concrete panels). 2 layer placement) became difficult. For this reason, the sealing material may deteriorate in about 10 to 20 years due to ultraviolet rays, and problems such as water leakage may occur. In high-rise buildings that require durability of 20 years or more for sealing, it is difficult to seal W Roughly extruded cement boards were rarely used.

  On the other hand, there is an isobaric joint structure in which the inside of the joint is an isobaric space as a seal structure that does not use a sealing material for the joint on the outdoor side. The isobaric space is a pressure control space formed by a water-stop member (rain barrier) on the outdoor side and a windproof gasket (wind barrier) on the indoor side, and the pressure in the joint is almost equal to the outside air pressure. Thus, the infiltration of rainwater due to the pressure difference is suppressed by the isobaric effect. As this type of structure without external sealing, Patent Document 1 describes an extruded cement board used for an isobaric joint structure. This extrusion-molded cement board is used in a horizontal manner, and an isobaric space is formed between an outdoor rain barrier and an indoor gasket.

Patent Document 2 describes an isobaric curtain wall structure of a PC plate. In this structure, an isobaric space is formed by the fin gasket on the outdoor side and the hollow gasket on the indoor side. Japanese Patent Application Laid-Open No. H10-228707 describes a rain-ending structure of a curtain wall. In this structure, an isobaric space is formed by the water stop member on the outdoor side and the gasket on the indoor side.
Japanese Utility Model Publication No. 7-16841 Japanese Utility Model Publication No. 4-103909 Japanese Unexamined Patent Publication No. 7-76888

However, in each of the above-described conventional isobaric space joint structures, in order to secure the isobaric space, an inclined portion that descends from the indoor side to the outdoor side is provided in the horizontal joint, and the isobaric space is formed using this inclined portion. It was secured. Therefore, it has been necessary to give a shape for forming a constant pressure space in advance to the horizontal joint. For example, the isobaric joint structure of Patent Document 1 is formed by extruding an extruded cement board into a shape having an isobaric space in advance. However, with the extrusion-molded cement board, the shape for forming the isobaric space can be formed at the time of extrusion, but only the cross-sectional shape of both sides parallel to the extrusion direction is formed, and only on the horizontal joint when flattened. It was not applicable. In other words, the extrusion-molded cement board cannot form the shape for securing the isobaric space at the time of extrusion into a small facet in the extrusion direction, and it is difficult to process the shape of the isobaric space later. Therefore, it has been considered that it is difficult to form a uniform structure with vertical tension. For this reason, there has been a demand to make it possible to realize an isobaric joint structure even when the extruded cement board is vertically stretched.
The present invention has been made in view of the above circumstances, and is an isobaric extruded cement board that can secure a sufficient isobaric space even if it is an extruded cement board that is thin and difficult to secure an isobaric space. The purpose is to provide a joint structure, thereby avoiding the restrictions of outdoor ceiling re-casting and realizing application to high-rise buildings.

In order to achieve the above object, according to the present invention, there is provided an isobaric joint structure of a vertically-extruded cement board according to the present invention, wherein an extrusion-molded cement board having a plurality of hollow portions open in both ends in the extrusion direction. The vertical direction of the hollow portion is the vertical direction, the horizontal joint space, the vertical joint space is an isobaric joint structure of a vertically-extruded cement board that is attached to a plurality of vertical and horizontal spaces across the vertical joint space,
The outdoor side of the vertical joint space is sealed with a gasket, and the indoor side is sealed with a sealing,
The outdoor side of the horizontal joint space is covered with a water stop member, and the indoor side is sealed with a windproof gasket,
The hollow portion that opens at the bottom of the horizontal joint space and the vertical joint space are closed by an upper small-mouth closing sheet that is adhered to the upper end surface of the extruded cement board,
The hollow portion that opens at the upper surface of the horizontal joint space is blocked by a lower fore-sealing sheet adhered to the lower end surface of the extruded cement plate,
The horizontal joint space and the vertical joint space are defined as a plurality of inverted T-shaped isobaric sections by disposing the isobaric partition block that divides the horizontal joint space at a substantially central portion in the width direction. It is characterized by that.

  In this vertical pressure-extrusion cement board isosceles joint structure, the horizontal joint space is blocked by right and left partition blocks, and the vertical joint space of one panel extending upward connected at the center. An inverted T-shaped isobaric section is formed. In the horizontal joint space, only the outdoor side is covered with the water-stopping member and the circulation of the outside air is allowed. Therefore, the horizontal joint space and the vertical joint space have the same pressure as the outside. Therefore, inflow of rainwater due to negative pressure in the joints does not occur. Even if rainwater flows into the joint, it is prevented from entering by the indoor sealing in the vertical joint space and by the windproof gasket in the indoor joint space. Thereby, even if it is an extrusion-molded cement board with a thin thickness and it is difficult to secure an isobaric space, a sufficient isobaric space that can obtain an isobaric effect is secured.

The isobaric joint structure of the vertically-extruded cement board according to claim 2, wherein the water stop member is a double elastic plate having a U-shaped cross section with the opening facing downward,
An outdoor air inlet is formed at different positions on the outdoor elastic plate and the indoor elastic plate.

  With this isometric joint structure of the vertically-extruded cement board, it is possible to introduce the outside air into the transverse joint space, while the outside air inlet and the inside elastic board are provided with the outside air inlet at different positions in the horizontal direction, for example. As a result, a trap structure is formed and direct intrusion of rainwater is prevented.

The isostatic joint structure of the vertically-extruded cement board according to claim 3 is a weight receiving member having a transverse T-shaped cross section having a horizontal plate protruding outward from the substantially central portion of the vertical side of the outdoor side of the vertical plate. Support the lower end of the extruded cement board with the horizontal plate,
The windproof gasket for sealing the indoor side of the horizontal joint space is sandwiched between the lower back end of the upper extruded cement plate and the vertical plate.

  In the isobaric joint structure of the vertically-extruded cement board, the upper surface portion of the weight receiving member that supports the lower end of the extruded cement board is used as a partition wall to define a transverse joint space, and isobaric at the transverse joint. The space can be formed with a simple structure.

  The isostatic joint structure of the vertically-extruded cement board according to claim 4, wherein the front joint of the outdoor side is covered with an upper fore-sealing sheet, and the rear part of the horizontal joint space is a rear lower end of the upper extrusion cement board. A draining plate having an upright portion rising between the vertical plates is disposed.

  In this isometric joint structure of vertically-extruded cement board, a draining board having uprights is placed in the horizontal joint space, so that rainwater that enters the horizontal joint space from the outside and flows further into the indoor side. Inflow resistance can be increased.

  According to a fifth aspect of the present invention, there is provided an isobaric joint structure of a vertically-extrusion-molded cement board, characterized in that a water return plate that is inclined upward toward the outdoor side is attached to the upper surface of the front end of the draining plate.

  In this isometric joint structure of the vertically-extruded cement board, before reaching the drainage board, a water return board that rises upward toward the outdoor side on the upper surface of the front end rises, so that a horizontal joint is provided from the outside. Infiltration water with a high flow velocity entering the space is also rebounded, making it difficult to reach the drainage plate, further enhancing the rainwater inflow prevention action to the back side.

  According to the isobaric joint structure of the vertically-extrusion molded cement board according to the present invention, the vertical joint space is sealed with a gasket and a sealing, and the horizontal joint space is sealed with a water-stopping member and a gasket, and is opened at the bottom of the horizontal joint space. By closing the hollow portion and the vertical joint space with the upper small-mouth closing sheet, the hollow portion opening at the upper surface of the horizontal joint space with the lower small-mouth closing sheet, and arranging the isobaric partition block at the substantially central portion in the width direction of the horizontal joint space Since the horizontal joint space and the vertical joint space are defined by a plurality of inverted T-shaped isobaric compartments, an isobaric effect can be obtained even if the extruded cement board is thin and difficult to secure the isobaric space. Sufficient isobaric space can be secured. As a result, it is possible to avoid the restriction of outdoor ceiling re-installation (to be free of sealing) and to realize application to high-rise buildings.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of an isobaric joint structure of a vertically-extruded cement board according to the present invention will be described with reference to the drawings.
FIG. 1 is a longitudinal sectional view of an isobaric joint structure according to the present invention, FIG. 2 is a transverse sectional view of an isobaric joint structure according to the present invention, and FIG. 3 is an extruded cement board having different width dimensions (a) and (b). It is sectional drawing shown by.
In the isobaric joint structure according to the present embodiment, an extrusion-molded cement board is used as a vertical stretch. L-shaped angles (pieces) 15 reinforced by a reinforcing plate 13 are attached to the casing 11 at regular intervals, and T-shaped angles 17 that are weight receiving members are attached to the L-shaped angles 15 through the panel width direction. . The T-shaped angle 17 supports the lower end of the extruded cement plate 21 with a horizontal plate 17V that protrudes from the substantially vertical central portion of the outdoor side surface of the vertical plate (lower side 17D, upper side 17U) to the outdoor side.

  The extruded cement board 21 is formed with a hollow portion 23 extending in the extrusion direction. The hollow part 23 is a hollow part 23 </ b> A having a cross-sectional shape different from that of the other hollow part 23 in which the metal fitting 25 is inserted. Three hollow portions 23A are formed in the long-width (W1 = 1185 mm) panel 21A shown in FIG. 3A, and two hollow portions are formed in the short-width (W2 = 885 mm) panel 21B shown in FIG. 23A is formed. In FIG. 3, reference numeral 24 denotes a wire for preventing the panel from falling off.

  A metal fitting 25 is inserted into the hollow portion 23 </ b> A, and a clip 29 is attached to the back side via a fixing bolt 27. The upper part of the lower panel 21D is attached by sandwiching the lower side 17D of the T-shaped angle 17 with an upper clip 29U. The lower part of the upper panel 21U is attached by sandwiching the upper side 17U of the T-shaped angle 17 with a lower clip 29D.

  In the isobaric joint structure of the vertical panel 21, the plurality of panels 21 are attached with the extending direction of the hollow portion 23 in the vertical direction, and the horizontal joint space HS and the vertical joint space VS are formed. As shown in FIG. 3, concave and convex portions 31, 33 are formed in the fitting portions at both ends of the panel, and the concave groove 31a provided in the concave side and the concave groove 33a provided in the convex top portion are illustrated in FIG. A constant pressure space 35 of the vertical joint space VS shown is formed. In the vertical joint space VS, the outdoor side is sealed by the gasket 37 and the indoor side is sealed by the sealing 39. In the figure, reference numeral 41 denotes noncombustible packing (ceramic wool).

FIG. 4 is a perspective view of the water stop member.
In the horizontal joint space HS, the outdoor side is covered with the water stop member 43, and the indoor side is sealed with the windproof gasket 45. The water stop member 43 is attached to the lower surface of the upper panel 21U. The water stop member 43 is composed of double elastic plates 43a and 43b having a U-shaped cross section with the opening facing downward. The outdoor air introduction ports 47 and 49 are located at different positions on the outdoor elastic plate 43a and the indoor elastic plate 43b. Is formed. As a result, the outside air introduction ports 47 and 49 are formed at different positions in the horizontal direction while allowing outside air to be introduced into the horizontal joint space HS, thereby forming a trap structure and preventing direct intrusion of rainwater. Has been.

FIG. 5 is a perspective view of the draining plate and the isobaric partition block.
The hollow portions 23, 23A opened at the bottom surface of the horizontal joint space HS and the vertical joint space VS are closed by the upper forehead closing sheet 51 attached to the upper end surface of the lower panel 21D. In the horizontal joint space HS, a draining plate 53 is placed on the horizontal plate 17V. In the draining plate 53, the outdoor front end 53a is in close contact with the upper surface of the lower panel 21D via a packing material (EPDM sponge) 55, which is a sponge member, and the rear part is the rear lower end of the upper panel 21U and the upper side 17U. It has the standing part 53b which stands up between. As for the draining board 53, the front end 53a on the outdoor side is covered with the upper fore mouth closing sheet 51. The upper small-mouth closing sheet 51 is bent and bent along the front surface of the packing material 55, and is bent again horizontally at the lower end of the packing material 55 to close the hollow portions 23 and 23 </ b> A. In addition, the hollow portions 23 and 23A opened on the upper surface of the horizontal joint space HS are closed by the lower forehead closing sheet 57 attached to the lower end surface of the upper panel 21U. By arranging the draining plate 53 having the standing portion 53b in the horizontal joint space HS, it is possible to increase the inflow resistance of rainwater that enters the horizontal joint space HS from the outside and further flows into the indoor side.

  Further, on the upper surface of the front end of the draining plate 53, there is provided a water return plate 59 that is inclined upward toward the outdoor side. Before reaching the draining plate 53, the water return plate 59 that is inclined upward toward the outdoor side on the upper surface of the front end of the draining plate 53 is raised, so that the invading water having a high flow velocity entering the horizontal joint space HS from the outside rebounds. Accordingly, it becomes difficult to reach the draining plate 53, and the rainwater inflow preventing action to the back side is further enhanced.

  A hard packing material (piece) 61 (see FIG. 6) for supporting lower portions at both ends of the upper panel 21U is attached to the upper side of the draining plate 53. Further, a hard packing material 63 is attached to a portion where the upper clip 29D is fastened to the standing portion 53b of the draining plate 33. That is, the lower part of the upper panel 21U is attached so as to sandwich the upper side 17U of the T-shaped angle 17 and the hard packing material (piece) 63 by the lower clip 29D.

  The windproof gasket 45 is provided on the indoor side of the horizontal joint space HS, and the windproof gasket 45 is sandwiched between the lower back end of the upper panel 21U and the upper side 17U. On the surface of the windproof gasket 45, a sealing material 65 for further ensuring the water tightness on the indoor side is provided. Thereby, the upper surface portion of the T-shaped angle 17 that supports the lower end of the upper panel 21U is used as a partition wall for defining the horizontal joint space HS, and the isobaric space in the horizontal joint space HS is formed with a simple structure. It is possible.

  In the horizontal joint space HS, an isobaric partition block 67 that divides the horizontal joint space HS is disposed. The isobaric partition block 67 is disposed at a substantially central portion in the panel width direction in order to partition the isobaric space at regular intervals. The isobaric partition block 67 is formed to have a hanging piece 67b and a standing piece 67c at the front and rear ends of the horizontal portion 67a. At the corners of the horizontal portion 67a and the drooping piece 67b, a notch 67d for fitting the rising tip of the water return plate 59 is formed. The isobaric partition block 67 divides the horizontal joint space HS for each central portion of the panel 21. The horizontal joint space HS whose left and right are divided by the equal pressure partition block 67 is connected to the vertical joint space VS for one panel extending upward at the center in the left and right direction. In FIG. 1, 69 indicates a hard packing material, 71 indicates a gasket, and 73 indicates a fireproof filler.

FIG. 6 is an exploded longitudinal sectional view before attaching a draining plate, FIG. 7 is an exploded longitudinal sectional view before attaching the upper extruded cement plate, and FIG. 8 is a front view of the outer wall of the extruded cement plate attached with an isobar section. .
In the isobaric joint structure having the above configuration, first, as shown in FIG. 6, the lower panel 21D is attached by the lower clip 29U, and the draining plate 53 is attached to the horizontal plate 17V. Next, the hard packing materials 61 and 63, the packing material 55, the water return plate 59, the upper fore mouth closing sheet 51, and the windproof gasket 45 are attached. Next, the equal pressure section block 67 is installed on the draining plate 53 and the water return plate 59 at predetermined intervals.

  Next, as shown in FIG. 7, the upper panel 21U with the water stop member 43 mounted on the lower surface is lowered from above and placed on the upper end surface of the lower panel 21D and locked to the upper side 17U. The upper panel 21U is completely attached by tightening the bolts 27 of the upper clip 29U.

  In the pressure joint structure assembled in this way, the horizontal joint space HS closed on the left and right by the constant pressure partition block 67 and the vertical joint space for one panel extending upward connected at the center thereof. At VS, an inverted T-shaped isobar section 75 shown in FIG. 8 is defined. In the horizontal joint space HS, the outdoor side is only covered with the water blocking member 43 and the circulation of outside air is allowed. Therefore, the horizontal joint space HS and the vertical joint space VS have the same pressure as the outside. That is, the horizontal joint space HS of the adjacent panels 21 and 21 and the vertical joint space VS are integrally formed to form a single-compartment isobaric space.

  Due to the equal pressure section 75, the inside of the joint can be formed with a pressure substantially equal to the outside air pressure, and the intrusion of rainwater can be suppressed. That is, inflow of rainwater due to negative pressure in the joints does not occur. Even if rainwater flows into the joint, it is prevented from entering by the indoor sealing 39 in the vertical joint space VS and by the windproof gasket 45 and the sealing material 65 in the horizontal joint HS. Thereby, even if it is the extrusion-molded cement board 21 with a thin thickness and it is difficult to ensure an isobaric space, sufficient isobaric space where the isobaric effect is obtained is ensured.

  Therefore, according to the isobaric joint structure of the above-mentioned vertical-extrusion-molded cement board, the vertical joint space VS is sealed by the gasket 37 and the sealing 39, and the horizontal joint space HS is sealed by the water stop member 43, the windproof gasket 45, and the sealing material 65 And the hollow portions 23 and 23A opened at the bottom of the horizontal joint space and the vertical joint space VS are closed by the upper small mouth closing sheet 51, and the hollow portions 23 and 23A opened at the upper surface of the horizontal joint space are closed by the lower small mouth closing sheet 57, etc. By disposing the pressure partition block 67 at a substantially central portion in the width direction of the horizontal joint space HS, the horizontal joint space HS and the vertical joint space VS are defined into a plurality of inverted T-shaped isobaric partitions 75. Even in the case of the extrusion-molded cement board 21 in which it is difficult to secure a thin isobaric space, it is possible to secure a sufficient isobaric space where an isobaric effect can be obtained. As a result, it is possible to avoid the restriction of outdoor ceiling re-installation (to be free of sealing) and to realize application to high-rise buildings.

  In addition, on the outdoor side of the joint, a dry barrier material such as a rain barrier and a gasket that is highly resistant to deterioration by ultraviolet rays is used, and a sealing material is placed on the indoor side where there is little deterioration. A joint structure with high properties can be obtained.

It is a longitudinal cross-sectional view of the isobaric joint structure according to the present invention. It is a cross-sectional view of the isobaric joint structure according to the present invention. It is sectional drawing which showed the extrusion-molded cement board of a different width dimension by (a) (b). It is a perspective view of a water stop member. It is a perspective view of a draining board and an equal pressure division block. It is a decomposition | disassembly longitudinal cross-sectional view before a draining board attachment. It is a decomposition | disassembly longitudinal cross-sectional view before an upper side extrusion molding cement board attachment. It is a front view of the extrusion molding board attachment outer wall in which the equal pressure division was formed.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 11 ... Housing, 17 ... T-shaped angle (weight receiving member), 17U, 17D ... Vertical plate, 17V ... Horizontal plate, 21 ... Extrusion cement board, 23, 23A ... Hollow part, 37 ... Gasket, 39 ... Sealing, 43 ... water stop member, 43a ... outdoor elastic plate, 43b ... indoor elastic plate, 45 ... windproof gasket, 47 ... outside air inlet, 51 ... upper small mouth closing sheet, 53 ... drain plate, 53a ... front end, 53b ... Standing part, 57 ... Lower small-mouth closing sheet, 59 ... Water maple plate, 67 ... Isobaric section block, 75 ... Isobaric section, VS ... Vertical joint space, HS ... Horizontal joint space

Claims (5)

Extruded cement board in which a plurality of hollow portions that open at both ends in the extrusion direction are formed in the width direction is a plurality of sheets in the vertical and horizontal directions across the horizontal joint space and the vertical joint space with the extending direction of the hollow portion in the vertical direction It is an isobaric joint structure of a vertically-extruded cement board attached to the housing,
The outdoor side of the vertical joint space is sealed with a gasket, and the indoor side is sealed with a sealing,
The outdoor side of the horizontal joint space is covered with a water stop member, and the indoor side is sealed with a windproof gasket,
The hollow portion that opens at the bottom of the horizontal joint space and the vertical joint space are closed by an upper small-mouth closing sheet that is adhered to the upper end surface of the extruded cement board,
The hollow portion that opens at the upper surface of the horizontal joint space is blocked by a lower fore-sealing sheet adhered to the lower end surface of the extruded cement plate,
The horizontal joint space and the vertical joint space are defined as a plurality of inverted T-shaped isobaric sections by disposing the isobaric partition block that divides the horizontal joint space at a substantially central portion in the width direction. An isobaric joint structure of a vertically-extruded cement board characterized by that. The water stop member is a double elastic plate having a U-shaped cross section with the opening facing downward,
2. The equal pressure joint structure for vertically-extruded cement board according to claim 1, wherein the outdoor elastic plate and the indoor elastic plate are formed with outside air inlets at different positions. A weight receiving member having a horizontal T-shaped cross section having a horizontal plate projecting from the upper and lower approximate center portion of the outdoor side surface of the vertical plate to the outdoor side, supporting the lower end of the extruded cement plate with the horizontal plate,
3. The vertically-extruded cement according to claim 1 or 2, wherein the windproof gasket for sealing the indoor side of the horizontal joint space is sandwiched between a lower back end of the upper extruded cement plate and the vertical plate. Isobaric joint structure of the board.   In the horizontal joint space, a water draining plate having an upright portion rising between the lower end of the back surface of the upper extruded cement plate and the vertical plate is disposed in the front end of the outdoor side covered with the upper small-mouth closing sheet. The isobaric joint structure of the vertically-extruded cement board according to claim 3.   5. The equal pressure joint structure for a vertically-extrusion-molded cement board according to claim 4, wherein a water return plate that is inclined upward toward the outdoor side is attached to the upper surface of the front end of the draining plate.

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