JP3194278U - Waterproof structure for horizontal joints of vertically-extruded cement board - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a horizontal joint waterproof structure of a vertically-extruded cement board capable of appropriate waterproofing without processing a groove on the upper end surface of the extruded cement board. SOLUTION: A space extending in the lateral direction is formed between the extrusion-molded cement plates in the horizontal joint portion 30, and in this space, an L-shaped steel material 104 for holding the extruded cement plate from below, an L-shaped steel material 104, and A draining material 50 disposed between the extruded cement board 10 and the extruded cement board 10 is provided. The draining material 50 is disposed on the lower side of the rising portion 51 located on the inner surface side of the extruded cement board, the horizontal portion 52 extending outward from the rising portion 51, and outside the L-shaped steel material 104 from the horizontal portion 52. The extrusion-molded cement board 10 has a hanging portion 53 having a length that does not reach the upper end surface 12. The lower surface of the L-shaped steel material 104 and an extrusion-molding disposed below the hanging portion 53. A horizontal joint gasket 60 having a material that is inserted between the upper surface of the cement board 10 and absorbs water to expand is provided. [Selection] Figure 1

Description

  The present invention relates to a waterproof structure for a horizontal joint in a vertically-extruded cement board.

  Conventionally, an extrusion-molded cement board as an outer wall of a building is attached to the housing by attaching a fixture provided on the indoor side to a holding member provided on the housing of the building. Further, such an extrusion-molded cement board is provided with concave and convex fitting portions in the length direction (direction in which the hollow portion extends) at both ends in the width direction, and is used as a vertically stretched outer wall material. In the length direction, concave and convex fitting portions are fitted, and the extruded cement boards attached to the upper and lower sides are attached with a certain interval. Therefore, joint portions are formed in both the vertical direction and the horizontal direction between the extruded cement boards attached in this way. A backup material is inserted into the joint, and a sealing material for maintaining waterproof performance is filled on the outside.

  As a prior art of this type, for example, there is a waterproof structure of a vertically-extruded cement board, which was previously filed by the present applicant. In this waterproof structure, a draining plate extending in the lateral direction is provided between the upper and lower vertical hollow extruded cement boards, and a water permeable portion for guiding rainwater flowing from the upper part to the lower part is provided at an outer position of the draining board. The backup material is provided, and the outer surface of the backup material is filled with a sealing material (see, for example, Patent Document 1).

  FIG. 8 is a cross-sectional view showing the structure at the horizontal joint portion of the extruded cement board. The building frame 100 is coupled so that a beam 101 and a floor slab 102 are integrated, and L-shaped steel materials (mountain steel materials) 103 and 104 are provided at outer end portions of the beam 101. The L-shaped steel members 103 and 104 are provided so that the vertically arranged sides are connected by welding or the like, and the height position of the horizontally arranged sides of the L-shaped steel material 104 located outside is a predetermined position. ing. The L-shaped steel material 104 is vertically stretched by engaging the clip material 125 of the extrusion-molded cement plate 120, and a horizontal joint portion 130 is formed between the vertically-extrusion extruded cement plates 110 and 120.

  In the horizontal joint portion 130, since the waterproof performance may be insufficient only with the sealing material 131, the hard packing 132 or the like is provided on the indoor side of the sealing material 131, and the backup material 138 provided inside the sealing material 131 is provided. As a secondary waterproof structure in which a drainer 134 is attached to the indoor side, the waterproof performance is improved. The draining material 134 includes a vertical piece 135 located on the indoor side, a horizontal piece 136 that extends outward in the horizontal direction from the lower end of the vertical piece 135, and a hanging piece 137 that hangs downward from the outer end of the horizontal piece 136. have. In addition, between the L-shaped steel material 104 and the extrusion-molded cement board 110, the rock wool material 133 is filled, and fire resistance is provided.

  The lateral joint portion 130 of the extruded cement board 110 having such a secondary waterproof structure is assumed to have water W such as rainwater (hereinafter referred to as “rainwater etc. W”) temporarily due to deterioration of the sealing material 131 on the surface. 130 (upper part of the figure), the rainwater W or the like flows from the hollow portion 121 of the extruded cement plate 120 through the back-up material 138 and the hanging piece 137 of the draining material 134 of the lower extruded cement plate 110. It leads to the hollow part 111 and prevents entry into the indoor side.

JP 2003-343023 A

  By the way, in the waterproof structure, rainwater or the like that hangs down from above is transmitted on the upper end surface of the crosspiece between the hollow portions of the lower extruded cement board, and does not flow into the indoor side. A groove portion 112 for allowing the hanging piece 137 of the draining material 134 to enter from the end surface to the crosspiece portion 113 is provided, and the hanging piece 137 enters the groove portion 112.

  However, in order to process the groove 112 at a predetermined position on the upper end surface of the extrusion-molded cement plate, it takes time for processing and the construction efficiency is lowered. Moreover, the processing of the groove 112 also causes an increase in construction cost. In addition, if the grooves are processed on site, dust is scattered and the on-site environment is deteriorated. Furthermore, the surrounding environment is also deteriorated by noise accompanying cutting.

  In order to prevent water from entering through the crosspiece, it is possible to put a gasket between the holding member and the extruded cement board, but bonding the gasket to the crosspiece with double-sided tape or adhesive Difficult on construction. In addition, it is difficult to connect gaskets in a portion that is continuous in the lateral direction. Further, in the conventional gasket, a slight gap is generated between the gasket and the extrusion-molded cement board due to a construction error or the like, and water may enter from this gap.

  Then, an object of this invention is to provide the horizontal joint part waterproof structure of the vertical-extrusion molded cement board which can perform appropriate waterproofing, without processing a groove part in the upper end surface of an extrusion-molded cement board.

  In order to achieve the above object, the present invention provides a horizontal joint waterproof structure in which an extruded cement board in which a hollow portion extending in the vertical direction is formed is vertically attached to a building frame. A predetermined space extending in the lateral direction is formed between the extruded cement plates that are attached in a direction, and the predetermined space includes a holding member that holds the extruded cement plate from below, the holding member, and the extruded cement plate And a draining material disposed between the rising part and the rising part positioned on the inner surface side of the extruded cement plate, and extending outwardly from the rising part along the upper surface of the holding member. A horizontal portion and a hanging portion extending from the horizontal portion to the outside of the holding member and below the thickness of the holding member, and having a length that does not reach the upper surface of the extruded cement board disposed on the lower side. Have A horizontal joint gasket comprising a material which is inserted between the lower surface of the holding member and the upper surface of the extrusion-molded cement plate disposed on the lower side, and absorbs water and expands inward from the hanging portion of the cut material. have. In this specification and the documents of the scope of the utility model registration request, the indoor side of the extruded cement board is referred to as inward, and the outdoor side is referred to as outward.

  With this configuration, even if water enters the horizontal joint portion of the vertical extruded cement board, the horizontal joint gasket having water absorption inserted between the lower surface of the holding member and the upper surface of the extruded cement board absorbs water. By being expanded, water can be prevented from entering the indoor side, and water can be effectively discharged into the hollow portion of the lower extruded cement board.

  Moreover, you may comprise the backup material which comprised the water permeability of the up-down direction in the outer surface of the hanging part of the said draining material.

  With this configuration, the backup material provided on the outer surface of the draining material is filled with a sealing material that seals the horizontal joint portion on the outer surface of the backup material while ensuring the vertical water permeability in the horizontal joint portion. Intrusion of water can be prevented.

  The horizontal joint gasket is formed of a composite material of a hydrophobic urethane foam and a water-swellable foamed resin material, and the water-swellable foamed resin material is formed on the holding member and the upper surface of the extruded cement board. You may insert in the state compressed so that it might closely contact.

  If comprised in this way, the water which flowed between the holding member and the upper surface of the extrusion-molded cement board will be absorbed by the water-absorbing swellable foamed resin material of the horizontal joint gasket to expand and maintain the waterproof property at the horizontal joint. be able to.

  The horizontal joint gasket is formed of a two-layer structure in which a hydrophobic urethane foam material and a water-swellable foamed resin material are joined, and the horizontal joint gasket has the water-swellable foamed resin material on the outside. It may be inserted so that the hydrophobic urethane foam material side is bent inward and in close contact with the holding member and the upper surface of the extruded cement board.

  If comprised in this way, the water absorption swelling foam which touches a holding member and an extrusion-molded cement board by bend | folding and using the horizontal joint gasket to which the hydrophobic urethane foam material and the water absorption swelling foam resin material were joined. Even if the resin material has a small amount of water absorption, it swells within the range of the thickness of the water-absorbing swellable foamed resin material, and the adhesion between the holding member and the extrusion-molded cement board becomes strong, and the watertightness can be improved.

  According to this invention, it is not necessary to process a groove part in the upper end surface of an extrusion-molded cement board, and it becomes possible to reduce the manufacturing efficiency and processing cost of the waterproof structure in a horizontal joint part. Moreover, the construction for arranging the draining material is simplified, and the construction efficiency can be improved.

FIG. 1 is a longitudinal sectional view showing a horizontal joint waterproof structure according to an embodiment of the present invention. 2 is a perspective view of the lateral joint waterproof structure shown in FIG. FIG. 3 is a perspective view of the draining material shown in FIG. FIG. 4 is a perspective view before the horizontal joint gasket shown in FIG. 2 is inserted. FIG. 5 is a longitudinal sectional view showing the horizontal joint portion before insertion of the horizontal joint gasket shown in FIG. 6 is a longitudinal sectional view showing a state where a gasket is inserted into the horizontal joint shown in FIG. FIG. 7 is a longitudinal sectional view of the horizontal joint after the gasket is inserted into the horizontal joint shown in FIG. FIG. 8 is a longitudinal sectional view showing a conventional horizontal joint waterproof structure.

  Embodiments of the present invention will be described below with reference to the drawings. The following embodiment is a horizontal joint waterproof structure in a vertically attached mounting configuration in which an extrusion-molded cement board is attached with the extrusion direction in which the hollow portion extends in the vertical direction as the vertical direction. In this vertically stretched extruded cement board, the vertical direction in which the hollow portion extends is the vertical direction, and the horizontal direction is the horizontal direction.

  As shown in FIGS. 1 and 2, the horizontal joint portion 30 of the extrusion-molded cement boards 10 and 20 to which the horizontal joint waterproof structure 1 in this embodiment is applied is formed on a building frame 100 having a beam 101 and a floor slab 102. It is a horizontal joint part of the extrusion-molded cement boards 10 and 20 vertically stretched on the outer surface of the L-shaped steel material 104 which is a holding member provided. The extrusion-molded cement boards 10 and 20 that are vertically stretched are L-shaped in which a clip member 25 (an extrusion-molded cement board 20 is not shown in FIG. 2), which is a fixture attached to the indoor side, is provided in the building housing 100. The steel material 104 is locked and attached. The L-shaped steel material 104 is fixed to the beam 101 via the L-shaped steel material 103, and is provided so as to extend in the horizontal direction. As shown in the figure, the extrusion-molded cement plates 10 and 20 are provided with a clip member 25 provided at the lower portion, which is locked to the L-shaped steel member 104, and a clip member provided at the upper portion (not shown) (the same member as the clip member 25: not shown). ) Is secured to an L-shaped steel material (the same member as the L-shaped steel material 104: not shown) provided in the building housing 100, and is attached to the building housing 100 up and down. The structure which latches the extrusion-molded cement boards 10 and 20 to the building frame 100 may be another structure.

  As shown in the drawing, the lower extruded cement board 10 attached is provided so that the upper end surface 12 has a predetermined gap S with the lower surface 105 of the L-shaped steel material 104. The upper extruded cement board 20 is provided so that the draining material 50 is sandwiched between the lower end surface 22 and the L-shaped steel material 104 in a state where the draining material 50 is disposed on the upper surface of the L-shaped steel material 104. A horizontal joint portion 30 is formed between the lower extruded cement board 10 and the upper extruded cement board 20.

  The draining material 50 disposed between the L-shaped steel material 104 and the extruded cement board 20 has a rising section 51 whose vertical section rises in the vertical direction on the indoor side of the extruded cement board 20, and the rising section 51. A horizontal portion 52 extending in a horizontal direction outward from the lower end of the steel plate, and extending from the tip of the horizontal portion 52 to a position lower than the thickness of the L-shaped steel member 104 and from the upper end surface 12 of the lower extruded cement plate 10 And a hanging portion 53 that hangs down to an upper position. The drooping portion 53 has a height dimension that fits in the horizontal joint portion 30. The draining material 50 is disposed on the upper surface of the L-shaped steel material 104, and the upper extruded cement board 20 is placed thereon. Further, a hard packing 31 is provided between the indoor side of the upper extruded cement board 20 and the rising portion 51 of the draining material 50. With this hard packing 31, the rising portion 51 of the draining material 50 is brought into close contact with the L-shaped steel material 104.

  As shown in FIG. 3, the draining material 50 includes a rising portion 51 that rises in the vertical direction, a horizontal portion 52 that extends in the horizontal direction from the lower end of the rising portion 51, and a hanging that hangs downward from the tip of the horizontal portion 52. This is a plate material having a substantially Z-shaped cross section in which the portion 53 is integrally formed.

  Further, a backup material 54 is provided on the outer surface of the hanging part 53 of the draining material 50. The backup material 54 is provided with a water permeable hole 55 penetrating in the vertical direction. The backup material 54 only needs to have water permeability in the vertical direction, and may have any water permeability in the vertical direction by a small opening or a continuous foam hole. Through the water permeable holes 55 of the backup material 54, rainwater or the like W flowing from the hollow portion 21 of the upper extruded cement plate 20 is discharged to the hollow portion 11 of the lower extruded cement plate 10 as shown in FIG. can do.

  A horizontal joint gasket 60 having water absorption is inserted between the lower surface 105 of the L-shaped steel material 104 and the upper end surface 12 of the lower extruded cement board 10. The indoor side of the horizontal joint gasket 60 is filled with the rock wool material 32 between the L-shaped steel material 104 and the upper end surface 12 of the extrusion-molded cement board 10, and fire resistance is imparted to the horizontal joint 30. Yes.

  As shown in FIG. 4, the horizontal joint gasket 60 of this embodiment has a two-layer structure in which a hydrophobic urethane foam material 61 and a water-swellable foamed resin material 62 are joined. The hydrophobic urethane foam material 61 and the water-absorbing swellable foamed resin material 62 can be integrated by bonding with a double-sided adhesive tape or an adhesive. In the horizontal joint gasket 60 of this embodiment, the ratio of the thickness of the water-absorbing swellable foamed resin material 62 to the thickness of the hydrophobic urethane foam material 61 is in the range of about 1: 1 to 1: 0.3. preferable. For example, if the ratio of the thickness of the water-absorbing swellable foamed resin material 62 to the thickness of the hydrophobic urethane foamed material 61 is about 1: 0.6, the hydrophobic urethane foamed material 61 and the water-absorbing swellable foamed resin material 62 are joined. When the horizontal joint gasket 60 is used by being folded, the horizontal joint gasket 60 inserted in a state of being folded and compressed is formed with the outer water-absorbing swellable foamed resin material 62 by the restoring force of the hydrophobic urethane foam 61. Adhesion between the L-shaped steel material 104 and the extruded cement board 10 can be stably maintained. As the hydrophobic urethane foam material 61, a material having a water repellent function, exhibiting a stable water-stopping property even at low compression, and having both flexibility and restorability is preferable.

  As the water-absorbing swellable foamed resin material 62, a resin material formed by foaming a resin base material in which a water-absorbing swellable resin is mixed and dispersed can be used. There is no restriction | limiting in particular in a resin base material, When it is set as a foaming material, what has sufficient intensity | strength and restoring force can be selected suitably, and can be used. As this resin base material, for example, synthetic resins such as acrylic rubber, butyl rubber, silicon rubber, urethane rubber, polyester, and polyurethane can be used. In particular, polyurethane is preferable in terms of durability and good adhesion to the hydrophobic urethane foam 61. As a preferable water-swellable urethane constituting the water-swellable urethane foam material as the water-swellable foamed resin material 62, a urethane resin obtained by mixing and dispersing a water-swellable resin in a urethane resin material can be used. . With this water-absorbing swellable foamed resin material 62, it is possible to appropriately maintain watertightness by absorbing the invaded water and expanding it.

  The horizontal joint gasket 60 may be a composite material of a hydrophobic urethane foam material 61 and a water-absorbing swellable foamed resin material 62.

  Further, as shown in FIG. 2, a vertical joint portion 40 is formed in the horizontal direction (lateral direction) of the extruded cement plates 10 and 20 stretched vertically, and the vertical joint portion gasket is formed in the vertical joint portion 40. 70 is inserted. As the vertical joint gasket 70, similarly to the horizontal joint gasket 60, a gasket in which a hydrophobic urethane foam material 61 and a water-swellable foamed resin material 62 are joined can be used.

  Next, a procedure for constructing the horizontal joint waterproof structure 1 will be described with reference to FIGS. In the state shown in FIG. 5, the lower extruded cement board 10 is attached to the building housing 100, and rock wool is placed indoors between the upper end surface 12 of the extruded cement board 10 and the lower surface 105 of the L-shaped steel material 104. In this state, the material 32 is filled.

  Next, as shown in FIG. 6, a horizontal joint gasket 60 having a two-layer structure in which a hydrophobic urethane foam material 61 and a water-swellable foaming resin material 62 are joined is arranged such that the hydrophobic urethane foam material 61 is on the inside. The spatula 80 is folded in half, and the folded horizontal joint gasket 60 is inserted outside the rock wool material 32 with the spatula 80. In this example, the horizontal joint gasket 60 is bent by inserting a spatula 80 in the middle portion of the horizontal joint gasket 60, and the horizontal joint gasket 60 in a state bent by the spatula 80 is formed on the extruded cement board 10. It is pushed between the upper end surface 12 and the lower surface 105 of the L-shaped steel material 104. If it does in this way, insertion of the horizontal joint part gasket 60 will be possible easily, and the efficiency of the insertion operation of the horizontal joint part gasket 60 can be aimed at. Thereby, the horizontal joint gasket 60 is pressed in a compressed state between the lower surface 105 of the L-shaped steel material 104 and the upper end surface 12 of the extruded cement plate 10, and the L-shaped steel material 104, the extruded cement plate 10 and the like. Close to.

  Further, the horizontal joint gasket 60 inserted between the lower surface 105 of the L-shaped steel material 104 and the upper end surface 12 of the extrusion-molded cement board 10 is folded and inserted so that the hydrophobic urethane foam 61 is inside. Therefore, the upper and lower surface sides that require watertight performance are the water-absorbing swellable foamed resin material 62. Hydrophobic urethane foam 61 has low affinity with water, but water-absorbing and swelling foamed resin material 62 swells by absorbing water, and has strong adhesion to the extruded cement board 10, resulting in watertight performance. It is possible to improve.

  Next, as shown in FIG. 7, the draining material 50 is disposed on the upper surface of the L-shaped steel material 104, and the clip material 25 of the upper extrusion-molded cement board 20 is locked to the L-shaped steel material 104. An extruded cement board 20 is attached to the upper part. At this time, the hard packing 31 is provided between the rising portion 51 of the draining material 50 at the position of the clip material 25 and the indoor side of the extrusion-molded cement board 20 to bring the draining material 50 into close contact with the L-shaped steel material 104. This extrusion-molded cement board 20 is also provided with a clip material (not shown) at the top, and is locked to an L-shaped steel material (not shown) provided in the building housing 100 so that the extrusion-molded cement board 20 is the building housing. 100.

  As a result, the drainage material 50 is suspended on the horizontal joint portion 30 (FIG. 1) formed between the upper end surface 12 of the lower extruded cement plate 10 and the lower end surface 22 of the upper extruded cement plate 20. The backup material 54 provided in the part 53 is in a state of being positioned. After that, the lateral joint portion 30 outside the backup material 54 is filled with the sealing material 33 to complete the lateral joint waterproof structure 1 (FIG. 1).

  According to the horizontal joint waterproof structure 1 configured in this manner, rainwater or the like W that hangs down the hollow portion 21 of the upper extruded cement board 20 is permeable to water provided on the outdoor side of the hanging portion 53 of the draining material 50. By the backup material 54 having the property, it can be drained downward.

  And, even if rain water or the like W flows from the upper end surface 12 of the crosspiece 13 of the lower extruded cement board 10 to the portion of the horizontal joint gasket 60 beyond the drainage material 50, the L-shaped steel material 104 The water-absorbing swellable foamed resin material 62 of the horizontal joint gasket 60 inserted so as to be in close contact with the lower surface 105 and the upper end surface 12 of the extrusion-molded cement board 10 swells including rainwater W and the like, and enters the indoor side. Can be prevented.

  In addition, the water-absorbing swellable foamed resin material 62 swells with rainwater or the like W, so that the adhesion between the lower surface 105 of the L-shaped steel material 104 and the upper end surface 12 of the extruded cement board 10 becomes strong, and the watertight performance. Can be improved.

  In addition, since the horizontal joint gasket 60 provided at the position of the hollow portion 11 between the crosspieces 13 of the extruded cement board 10 swells and swells downward at the position of the hollow portion 11, the rainwater W or the like is on the lower side. It can be effectively discharged to the hollow portion 11 of the extrusion-molded cement board 10 through the lateral joint gasket 60 which is swollen.

  That is, the horizontal joint gasket 60 is folded in half with the hydrophobic urethane foam 61 side inside so that the water-absorbing swellable foam resin material 62 is outside, and the upper end surface 12 of the L-shaped steel material 104 and the extruded cement board 10 is folded. It is inserted in close contact with. Therefore, even if water enters, the water-absorbing swellable foamed resin material 62 starts to swell with a small amount of water and firmly adheres to the L-shaped steel material 104 and the upper end surface 12 of the extruded cement board 10. The rainwater W or the like transmitted through the crosspieces 13 between the hollow portions 11 of the extrusion-molded cement board 10 is blocked by the horizontal joint gasket 60 and is transmitted downward through the horizontal joint gasket 60 at the position of the hollow portion 11. Can be discharged. That is, it becomes possible to block the water that has entered from the outdoor side of the horizontal joint portion 30 with the horizontal joint gasket 60 and to stably exhibit appropriate watertight performance.

  As described above, according to the horizontal joint waterproof structure 1, the groove portion (112 shown in FIG. 8) in which the drooping portion 53 of the draining material 50 enters the upper end surface 12 of the extruded cement board 10 (20) is provided. Since the watertight performance can be maintained, it is possible to improve the construction efficiency of the extrusion-molded cement plates 10 and 20 without the trouble of processing the groove.

  In addition, it is possible to prevent the dust environment from deteriorating due to the processing of the grooves on site, and to prevent the surrounding environment from deteriorating due to noise.

  Therefore, it is possible to improve the workability including the waterproof treatment of the horizontal joint portion 30 when the extruded cement plates 10 and 20 are vertically stretched and to prevent deterioration of the surrounding environment, and to efficiently stretch the extruded cement plates 10 and 20 vertically. Can be performed.

  In the above-described embodiment, the configuration in which the extruded cement plates 10 and 20 are held by the clip material 25 has been described. However, the configuration in which the extruded cement plates 10 and 20 are held in the building housing 100 is another configuration. The present invention is not limited to the above embodiment.

  Moreover, the structure which provides the rock wool material 32 in above-described embodiment is an example, You may provide structures other than this embodiment, and the filler which improves fire resistance is not limited to the said embodiment.

  Furthermore, the above-described embodiment shows an example, and various modifications can be made without departing from the gist of the present invention, and the present invention is not limited to the above-described embodiment.

  The horizontal joint waterproof structure according to the present invention can be used as a waterproof structure in the horizontal joint of an extrusion-molded cement board that is attached by vertical tension.

1 Horizontal joint waterproof structure 10 Extruded cement board (lower side)
11 Hollow portion 12 Upper end surface 13 Crosspiece 20 Extruded cement board (upper side)
21 hollow part 22 lower end surface 30 horizontal joint part 33 sealing material 40 vertical joint part 50 draining material 51 rising part 52 horizontal part 53 hanging part 54 backup material 55 water permeable hole 60 horizontal joint part gasket 61 hydrophobic urethane foam 62 water absorption swelling Foamed resin material 80 Spatula 100 Building frame 104 L-shaped steel (holding member)
S clearance
W Rainwater, etc.

Claims (4)

A horizontal joint waterproof structure in which an extrusion-molded cement board in which a hollow portion extending in the vertical direction is formed is attached vertically to a building frame,
A predetermined space extending in the horizontal direction is formed between the extruded cement plates attached in the vertical direction in the horizontal joint portion,
The predetermined space includes a holding member for holding the extruded cement board from below, and a draining material disposed between the holding member and the extruded cement board,
The draining material includes a rising portion located on the inner surface side of the extruded cement board, a horizontal portion extending outwardly from the rising portion along the upper surface of the holding member, and an outer side of the holding member from the horizontal portion. And a drooping portion that extends below the thickness of the holding member and does not reach the upper surface of the extruded cement plate disposed on the lower side,
A horizontal joint portion comprising a material that is inserted between a lower surface of the holding member and an upper surface of an extruded cement plate disposed on the lower side, and absorbs water and expands at an inner position than a drooping portion of the draining material. A waterproof structure for a horizontal joint portion of a vertically-extruded cement board characterized by having a gasket.   The horizontal joint waterproofing structure for a vertically-extruded cement board according to claim 1, wherein a back-up material having water permeability in the vertical direction is provided on the outer surface of the hanging part of the draining material. The horizontal joint gasket is formed of a composite material of a hydrophobic urethane foam material and a water-absorbing swelling foam resin material,
The horizontal joint of the vertically-extruded cement board according to claim 1 or 2, wherein the water-absorbing swellable foamed resin material is inserted in a compressed state so as to be in close contact with the holding member and the upper surface of the extruded cement board. Waterproof structure.   The horizontal joint gasket is formed of a two-layer structure in which a hydrophobic urethane foam material and a water-absorbing swelling foamed resin material are joined, and the horizontal joint gasket is arranged such that the water-absorbing swelling foam resin material is on the outside. The horizontal joint of the vertically-extruded cement board according to claim 1 or 2, which is inserted so as to be in close contact with the holding member and the upper surface of the extruded cement board by bending the hydrophobic urethane foam material inside. Waterproof structure.

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