JP4149382B2 - Drainage material for extruded cement board and waterproof seal structure for joint part of extruded cement board using the same - Google Patents

Description

  The present invention relates to a drainage material for an extruded cement board and a waterproof seal structure of an extruded cement board joint portion using the drainage material, and more specifically, formed when an outer wall is formed vertically using an extruded cement board. The present invention relates to an improved technique for ensuring waterproof sealing of a joint (joint part).

  An extrusion-molded cement board obtained by extruding an uncured cement material and being cured is suitably used as a building exterior board because it is lightweight and has high strength. This type of extrusion-molded cement board is attached to a building frame by using a mounting bracket generally called a fastener or a Z-clip. When attaching an extrusion-molded cement board to an enclosure as an outer wall, a horizontal joint is formed between the extrusion cement boards adjacent to the upper and lower sides, and a vertical joint is formed between the extrusion cement boards adjacent to the left and right. By sealing the horizontal joints and the vertical joints formed in this way with a sealing material, intrusion of rainwater from these joints to the indoor side of the building is prevented.

  For example, in the conventional waterproof seal structure shown in FIG. 12, the angle steel members 1, 3 which are support members fixed back to back are fixed to the frame-side vertical steel material 7 via the short connecting steel material 5. The upper and lower extrusion-molded cement plates 9 and 11 are vertically stretched with a horizontal piece of the above. The extruded cement plates 9 and 11 are fixed to the angle steel materials 1 and 3 by Z clips 13a and 13b. The joint portion 15 is waterproof and sealed with a sealing material 17 a on the front surface side and a sealing material 17 b and a gasket 18 on the back surface side. In the figure, reference numeral 16 denotes an inner drainage, and 16a denotes an indoor rising portion of the drainage.

  In the conventional waterproof seal structure shown in FIG. 13, the angle steel material 1 is fixed to the frame-side vertical steel material 7 via a connecting steel material 21 extending in the up-down direction, and the upper and lower extrusions are sandwiched between the horizontal pieces of the angle steel material 1. Molded cement plates 9 and 11 are vertically stretched. The extruded cement board 9 is fixed to the angle steel material 1 by a Z clip 13a, and the extruded cement board 11 is fixed to the connecting steel material 21 by a Z clip 13b. The joint portion 15 is waterproof and sealed with a sealing material 17a on the front surface side and a nor seal 22 and a sealing material 17b on the back surface side. In the figure, reference numeral 20 denotes an internal drainage, and 20a denotes an indoor rising portion of the drainage.

  The waterproof seal structure of the extrusion-molded cement board joint part shown in FIG. 14 fixes the chevron steel material 1 to the frame-side vertical steel material 7 shown in FIG. 13 via the connecting steel material 21 and sandwiches the horizontal piece of the chevron steel material 1. The upper and lower extruded cement plates 9 and 11 are vertically stretched. The lower end of the connecting steel material 21 is fixed to a beam (not shown) via a reinforcing steel material 27, and an angle steel material 29 is fixed to the reinforcing steel material 27. The extruded cement board 9 is fixed to the connecting steel material 21 by the Z clip 13a, and the extruded cement board 11 is fixed to the angle steel material 29 by the Z clip 13b. The joint part 15 is waterproof-sealed with a sealing material 17a on the front side and a gasket 31 on the back side. Moreover, this joint part 15 is located below the interlayer slab. In addition, in the figure, 32 is an internal drainage, 32a shows the indoor side rising part of the drainage.

  However, in such a seal structure, there is a risk that rainwater may enter the housing due to aging deterioration of the sealing material (particularly the sealing material 17a). In order to prevent such inconvenience, the joint portion 15 is given secondary waterstop. As shown in FIG. 12 and FIG. 13, the construction method uses an internal drainer to drain into the hollow portion 33 and an external drainer as shown in FIG. There may be drainage.

  In Patent Document 1 and Patent Document 2 below, a draining plate is attached to the horizontal joint of the vertically-extruded cement board, and rainwater that has entered the housing side due to aging deterioration of the sealing material is removed from the inner drainage to the lower panel. A structure for draining into the hollow portion is described. Moreover, the following patent document 3 describes a structure in which an internal drainage board with a backup material provided with a drain hole is attached to a horizontal joint of a vertically-extruded cement board, and a sealing material is filled on the front surface thereof. . In this joint structure, rainwater that has entered the housing due to deterioration of the sealing material over time flows from the drainage to the hollow part of the lower panel. Furthermore, the following Patent Document 4 describes a structure in which rainwater is sequentially drained from the upper part to the hollow part of the lower extruded cement board with the same structure as Patent Document 3.

  For example, in the case of the waterproof seal structure shown in FIGS. 12 and 13, the rainwater drained into the hollow portion 33 penetrates the drainage pipe 19 with a backflow prevention valve communicating with the inside of the joint portion 15 into the sealing material 17 a. Then, the water was discharged to the outside through the drain pipe 19.

JP-A-6-57830 Japanese Utility Model Publication No. 53-615 JP-A-7-317164 JP-A-11-229543

However, the waterproof seal structure shown in FIGS. 12 and 13 is easily clogged because the drain pipe is provided with a backflow prevention valve, and rainwater may not be appropriately discharged to the outside. Further, in the waterproof seal structure shown in FIG. 14, since the joint portion is under the interlayer slab (under the beam), the base material for mounting the panel (such as the angle steel material 1 and the connecting steel material 21) becomes an obstacle, and the gasket 31 fits in the state. It could not be confirmed from the room side. Moreover, when using an external drainer, since the design property of the drainer was low, it could not be used for a building that emphasizes design. In addition, in the waterproof seal structure disclosed in Patent Document 1 and Patent Document 2, since there is no water stop mechanism on the indoor side, it was not possible to prevent the intrusion of rainwater around the drainage. Further, in the waterproof seal structure disclosed in Patent Document 1, Patent Document 3, and Patent Document 4, all of the infiltrated rainwater is drained to the lower portion through the hollow portion, but in the lowermost portion, the infiltrated water increases, and the backflow prevention valve There was a risk of overflow because a large amount of drainage could not be secured by the attached drain pipe. And any of the above-mentioned waterproof seal structures is insufficient in the water stop function of the indoor rising part of the drainer.
The present invention has been made in view of the above situation, and has a high water stopping function for reliably preventing rainwater intrusion into the indoor side, and a waterproofing material for an extruded cement board joint portion using the drained material for the cement board. It is to obtain a seal structure.

  In order to achieve the above object, according to the present invention, there is provided a drainage material for an extruded cement board according to the present invention, wherein an extruded cement board having a through hollow portion opened at the upper and lower end surfaces is vertically adjacent to a support member. A draining material for an extruded cement board provided at a joint portion between the extruded cement boards adjacent to each other on the upper and lower sides, and an outer drainage whose tip edge protrudes from the surface of the extruded cement board. And an inner water drain having a rising portion standing upright in parallel with the rear surface of the extruded cement board continuously with the rear edge of the outer water drain, and an upper water return protrusion protruding toward the rear surface is formed on the rising portion. And a lower water return protrusion that hangs down in the hollow portion is provided in the drainage.

  In this extruded cement board drainage material, rainwater that enters the upper surface side of the outer drainage and tries to propagate upward through the falling part due to surface tension or the like is clogged by the upper water return protrusion and is difficult to enter. In addition, rainwater that has entered from the lower surface side of the outer drainage is directed downward by hitting the lower water return projection, and falls to the hollow portion, thereby preventing rainwater from entering the lower surface side of the inner drainage.

  The drainage material for an extrusion-molded cement board according to claim 2 is characterized in that a bulging portion protruding downward is formed at the front edge of the outer drainage so as to extend in the longitudinal direction of the outer drainage.

  With this drained material for extruded cement board, the swelled portion is formed so that the external drainage can also function as a decorative member. Unlike conventional flat plate-shaped water slices, the tetherability is improved. It is done.

  The waterproof seal structure of the extruded cement board joint part according to claim 3 is the waterproof seal of the extruded cement board joint part provided with the draining material for extruded cement board according to claim 1 or 2 in the joint part. The sealing material seals the space between the lower end surface of the upper extruded cement board and the external drainage, and between the upper end surface of the lower extruded cement board and the external drainage. An upper gasket that is in close contact with the back surface of the upper extruded cement board and the rising portion of the internal water drainage is placed on the upper surface of the upper water return protrusion.

  With this waterproof seal structure of the extruded cement board joint, rainwater entering from the outside to the indoor side is the primary water stop line by the sealing material, the secondary water stop line by the upper water return protrusion, and the tertiary water stop by the upper gasket. The line is blocked in triplicate.

  The waterproof seal structure for the extruded cement board joint portion according to claim 4, wherein the lower end of the upper extruded cement board is supported by the horizontal piece of the support member with the drainage material for the extruded cement board interposed therebetween, A lower gasket is inserted into a gap between the upper surface on the back side of the extruded cement plate and the horizontal piece.

  In this waterproof seal structure of the extruded cement board joint part, even if rainwater enters from the lower surface side of the outside drainage and exceeds the lower water return protrusion, the back side upper end surface of the lower extruded cement board and the horizontal piece Further intrusion is prevented by the lower gasket sandwiched in the gap.

  The waterproof seal structure of the extruded cement board joint part according to claim 5 is characterized in that a drain pipe that opens a base end at the joint part and opens a distal end outside is in contact with an upper surface of the drained material for the extruded cement board. It is characterized by being provided.

  In this waterproof seal structure of the extruded cement plate joint part, the rainwater that has entered the joint part from the lower surface side of the outer water drain and dropped into the hollow part by the lower water return protrusion is the extruded cement of each layer installed at the lower end of the hollow part It is received on the top surface of the drainage material for plates and drained to the outside through a drain pipe.

  The waterproof seal structure of the extrusion-molded cement board joint portion according to claim 6 is characterized in that the drainage pipe has a falling portion that bends downward on the tip side.

  With this waterproof seal structure of the extruded cement board joint part, the reverse structure that prevents the reverse flow of rainwater from entering the joint part from the drain pipe is blocked by the resistance of the bent part, and at the same time, does not have a backflow prevention valve By preventing the backflow only by clogging, clogging hardly occurs.

  The waterproof seal structure of the extrusion-molded cement board joint part according to claim 7 is characterized in that the joint part is arranged on the upper side of the interlayer slab.

  With this waterproof seal structure of the extruded cement board joint part, the joint part is visible on the upper side of the interlayer slab, allowing joint and seal construction without scaffolding, and visual inspection of the upper and lower gaskets after construction. Confirmation is also possible.

  According to the drainage material for an extruded cement board according to claim 1 of the present invention, the outer drainage and the inner drainage are integrally formed, the upper drainage protrusion is provided at the rising portion of the inner drainage, and the hollow portion is provided in the outer drainage. Since the lower water return protrusion that hangs down is provided, rainwater entering the upper surface side of the outside drainage drain and trying to propagate upward through the falling part due to surface tension etc. is blocked by the upper water return protrusion and becomes difficult to enter Rainwater that has entered from the lower surface side of the outer drainage strikes the lower water return projection, is guided downward, and falls into the hollow portion, thereby preventing rainwater from entering the lower surface side of the inner drainage. As a result, it is possible to easily realize a high water stop function that reliably prevents the intrusion of rainwater into the room with a single member.

  According to the drainage material for extrusion-molded cement board according to claim 2 of the present invention, the bulging portion protruding downward is formed at the front edge of the outer drainage so as to extend in the longitudinal direction of the outer drainage. Unlike the water slice, it has the effect of preventing the water that has flowed on the surface of the draining surface. In addition, since the design can be imparted, the design of the exterior of the building is not deteriorated unlike the conventional draining.

  According to the waterproof seal structure of the extruded cement board joint part according to claim 3 of the present invention, the drainage material for the extruded cement board according to claim 1 or 2 is provided in the joint part, and the upper extruded cement is provided. Since the upper gasket that is in close contact with the back of the plate and the rising edge of the internal water drainage is placed on the upper surface of the upper water return protrusion, a primary water stop line is formed by the sealing material, and the secondary water stop line is formed by the upper water return protrusion. Further, a tertiary water stop line is formed by the upper gasket, so that intrusion of water leakage into the indoor side can be prevented in triplicate, and water tightness can be greatly improved.

  According to the waterproof seal structure of the extruded cement board joint portion according to claim 4 of the present invention, the lower gasket is sandwiched between the rear upper end surface of the lower extruded cement board and the horizontal piece of the support member. Since it has entered, it is possible to prevent rainwater entering the indoor side beyond the lower water return projection by the lower gasket and to cooperate with the lower water return projection to prevent double leakage to the indoor side. it can.

  According to the waterproof seal structure of the extruded cement board joint part according to claim 5 of the present invention, the drain pipe for opening the base end at the joint part and opening the distal end outside is provided as a draining material for the extruded cement board. The rainwater that has entered the joint part from the lower surface side of the external drainer is dropped into the hollow part by the lower water return projection, and is provided on the upper surface of the external water drainer of each layer installation located at the lower end of the hollow part. It can be drained to the outside with a drain pipe.

  According to the waterproof seal structure of the extrusion-molded cement board joint part according to claim 6 of the present invention, the falling part bent downward is formed on the tip side of the drainage pipe, so that it enters the joint part from the drainage pipe. It can prevent backflow of rainwater to try and prevent clogging.

  According to the waterproof seal structure of the extruded cement board joint portion according to claim 7 of the present invention, since the joint portion is disposed on the upper side of the interlayer slab, the work can be performed without a scaffold, and the back surface of the extruded cement board. Confirmation of construction (visual check of upper gasket and lower gasket, etc.) can be made possible from the side.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of a drainage material for an extruded cement board according to the present invention and a waterproof seal structure of an extruded cement board joint portion using the same will be described with reference to the drawings.
FIG. 1 is a longitudinal sectional view of a waterproof seal structure of an extruded cement board joint portion according to the present invention, and FIG. 2 is a perspective view of the waterproof seal structure shown in FIG. In addition, the same code | symbol shall be attached | subjected and demonstrated to the member and site | part same as the member and site | part shown to FIGS.
The drainage material for extrusion-molded cement board according to the present embodiment (hereinafter referred to as “drainage material”) 100 is adjacent to the extrusion-molded cement boards 9 and 11 having through-holes 33 opened at the upper and lower end surfaces. Then, when attaching to the building frame via the angle steel members 41 and 43 that are the support members, they are provided at the joint portions 42 between the extruded cement plates 9 and 11 adjacent to each other in the vertical direction.

  The drainage material 100 stands up in parallel with the outer drainage 45 whose front end edge protrudes from the surface of the extruded cement plates 9 and 11 and the rear edge 9a of the extruded cement plate 9 continuously to the rear edge of the outer drainage plate 45. An internal drainer 49 having a rising portion 47 is integrally formed. The draining material 100 can be obtained by aluminum extrusion using a base opening having the same shape as the longitudinal cross-sectional shape shown in FIG. 1, but can also be formed by a stainless steel material or a vinyl chloride material in addition to aluminum. The draining material 100 may be attached to all the layers (each horizontal joint), or may be attached to several layers.

  The upper extruded cement board 9 is supported by a horizontal piece of an angle steel 41 through a rocking block 51 and a draining material 100 at the lower end surface, and a back surface 9 a is perpendicular to the angle steel 41 through a hard packing 53 and a rising portion 47. It is in contact with the piece. A Z clip 13a is fixed to the lower rear surface 9a of the upper extruded cement board 9 by bolts 55 and square nuts 57, and the Z clip 13a is formed by sandwiching a vertical piece of the angle steel 41 between the rear surface 9a and an extruded cement board. 9 is held. In addition, a vertical piece of an angle steel material 43 is brought into contact with the upper back surface 11a of the lower extrusion cement board 11, and the vertical steel piece 43 is sandwiched between the Z clips 13b so that the extrusion cement board 11 is keeping.

  The vertical piece of the angle steel 41 is fixed to the vertical piece of the connecting steel 59 made of another angle steel. The horizontal piece of the angle steel 43 is fixed to the horizontal piece of the connecting steel 59. The horizontal piece of the angle steel member 43 fixed to the connecting steel member 59 is fixed to the longitudinal steel member 7 via the plate top surface member 61. In the present embodiment, the joint portion 42 is disposed so as to be above the interlayer slab.

  The rising portion 47 is integrally formed with an upper water return protrusion 63 that protrudes toward the back surface 9a. In addition, a lower water return protrusion 65 that hangs down in the hollow portion 33 is integrally formed on the outer water drain 45. In the present embodiment, the outer drainage 45 on the tip side from the lower water return protrusion 65 is inclined downward. Accordingly, it is easy to take a drainage gradient in a drain pipe which will be described later, and it is also easy to drain rainwater that has entered the joint portion 42.

  The upper water return protrusion 63 provided on the rising portion 47 enters the joint portion 42 from the upper surface side of the outer drainage 45, dams rainwater trying to propagate upward in the rising portion 47 due to surface tension or the like, and prevents further intrusion. It is hard to do. Further, the lower water return protrusion 65 prevents rainwater that has entered from the lower surface side of the outer drainage 45 from hitting and guiding it downward and falling to the hollow portion 33 to prevent the rainwater from entering the lower surface side of the inner drainage 49. Yes.

  A bulging portion 67 protruding downward is formed at the leading edge of the outer drainage 45 so as to extend in the longitudinal direction of the outer drainage 45. The outer drainage 45 has the bulging part 67, and thus has an effect of preventing the sneak current flowing on the drainage surface side. In addition, the function as a decorative member is exhibited, and the tetherability is enhanced unlike a conventional simple flat water slice. As a result, the design of the exterior of the building is not deteriorated unlike the conventional drainer.

  The waterproof seal structure of the extrusion-molded cement board joint portion according to the present invention is provided with various means for disposing the draining material 100 having a high water-stopping function in the joint portion 42 and further improving the water-stopping property. That is, the sealing material 69a, 69b is between the lower end surface on the surface side of the upper extruded cement plate 9 and the outer drainage 45, and between the upper end surface on the surface side of the lower extruded cement plate 11 and the outer drainage 45. It is blocked by.

  Further, an upper gasket 71 that is in close contact with the back surface 9 a of the upper extruded cement board 9 and the rising portion 47 of the internal drainer 49 is placed on the upper surface of the upper water return protrusion 63. Therefore, rainwater entering the indoor side from the outside is blocked in triplicate by the primary water stop line by the sealing materials 69a and 69b, the secondary water stop line by the upper water return protrusion 63, and the tertiary water stop line by the upper gasket 71. ing.

  The upper extrusion-molded cement board 9 is supported by a horizontal piece of the angle steel 41 with a draining material 100 interposed at the lower end. And the lower gasket 73 is inserted | pinched by the clearance gap between the back side upper end surface of the lower extrusion-molded cement board 11, and a horizontal piece. Therefore, even if rainwater enters from the lower surface side of the outer drainage 45 and exceeds the lower water return protrusion 65, the lower gasket 73 prevents further intrusion. Thereby, the lower water return protrusion 65 and the lower gasket 73 cooperate to prevent double leakage of water to the indoor side. In FIG. 1 and FIG. 2, reference numeral 75 denotes a backup material that supports the sealing materials 69a and 69b behind, and in FIG. 2, 76 denotes a vertical joint seal.

FIG. 3 is a cross-sectional view of the vicinity of the drain pipe, FIG. 4 is a detailed perspective view of the drain joint part, and FIG. 5 is a vertical cross-sectional view of the lowermost part.
As shown in FIG. 3, the joint portion 42 is provided with a drain pipe 77 having a base end opened in the joint portion and a distal end opened outside through the sealing material 69 a so as to contact the upper surface of the draining material 100. It has been. As a result, rainwater that has entered the joint portion 42 from the lower surface side of the outer drainage 45 is dropped to the hollow portion 33 by the lower water return protrusion 65, and water provided on the upper surface of the drainage material 100 located at the lower end of the hollow portion 33. The drain pipe 77 can drain the water to the outside.

  Here, the drain pipe 77 has a falling portion 77a that bends downward on the tip side. Therefore, the reverse flow of the rainwater entering the joint portion 42 from the drain pipe 77 is prevented by the resistance of the falling portion 77a that bends. At the same time, since the backflow is prevented only by the falling structure without the backflow prevention valve, clogging is less likely to occur.

  The draining material 100 is formed of a long material having a predetermined length. Therefore, a joint portion between the draining materials 100 is generated in the joint portion 42. As shown in FIG. 4, the joint portion is located on the same angle steel member 41, on a waterproof liner 79 made of a stainless steel thin plate or the like, and a butyl adhesive 81 or the like is placed in the gap between the end portions of the draining material 100. Filled. In addition, in this joint part, sealing material 69a, 69b and the upper gasket 71 will cross | intersect continuously.

  As shown in FIG. 5, the lowermost ends of the vertically-extrusion extruded cement plates 9 and 11 are waterproof and sealed by a drainage material 83 made of stainless steel or the like bent into a substantially crank shape without using the drainage material 100. Can be formed. In this case, the draining material 83 is supported via the hard packing 87 on the horizontal piece of the angle steel 41 fixed on the base portion 85. The lower end of the extruded cement plate 11 is placed on the draining material 83 via the hard packings 89 and 91. The lower end of the extruded cement plate 11 is sandwiched between the Z clip 13b and the vertical piece of the angle steel 41 between the rear surface 11a. To be retained.

  A gasket 93 is interposed between the back surface 11 a and the vertical piece of the angle steel 41. Further, the sealing material 95 is filled in the joint intersecting portion on the gasket 93. A gap between the draining material 83 and the lower end of the extruded cement plate 11 is filled with a sealing material 69a, and a draining pipe 97 that opens at the lowermost end of the hollow portion 33 is passed through the sealing material 69a. The drainage pipe 97 has a larger inner diameter than the drainage pipe 77 described above, and enhances the drainage function of rainwater that increases the amount of water by concentrating on the lower part.

  A waterproof rubber sheet 99 is sandwiched between the square nut 57 for fixing the lowermost Z clip 13 a and the inner wall surface of the hollow portion 33. Thereby, even if the rainwater level in the hollow portion 33 rises, the rainwater does not enter the indoor side from the through hole of the bolt 55.

  And as for the joint part 42 provided with the said draining material 100, this joint part 42 is arrange | positioned above an interlayer slab. As a result, the joint part 42 can be visually recognized on the upper side of the interlayer slab so that the joint seal can be constructed without a scaffold, and the upper gasket 71 and the lower gasket 73 after the construction can be visually confirmed. It has become.

Next, the operation of the waterproof seal structure described above will be described.
FIG. 6 is an explanatory view of the water stop action when the vertical joint seal is broken.
When the vertical joint seal material 76 (see FIG. 2) is cut due to deterioration over time and rainwater enters the extruded cement plates 9 and 11 from the vertical joints, the rainwater is received on the drainage material 100 and from the drain pipe 77. Drained to the outside.

FIG. 7 is an explanatory view of the water stop action by the upper gasket when the transverse joint seal is cut.
When the lateral joint seal (sealing material 69a) is cut and rainwater is transmitted to the indoor side through the upper surface side of the draining material 100, it is blocked by the upper gasket 71 and is prevented from entering the room. Further, since the upper gasket 71 is arranged lower than the rising portion 47, a water leakage storage portion 101 is formed between the rising portion 47 and the back surface 11a, and an emergency water leakage is also stored here, so that it is difficult to flow into the room. ing.

FIG. 8 is an explanatory view of the water stop action by the upper water return protrusion when the transverse joint seal is cut.
When the horizontal joint seal (sealing material 69a) is cut and rainwater is transmitted to the indoor side through the upper surface side of the draining material 100, it hits the upper water return protrusion 63 and it is easy to prevent further intrusion into the indoor side. In other words, a preliminary water stopping action before reaching the upper gasket 71 works.

FIG. 9 is an explanatory view of the water stop action at the bottom.
The rainwater whose amount of water has increased by being dropped into the hollow portion 33 is drained to the outside by a drain pipe 97 having a large inner diameter at the bottom. Even if the rainwater level in the hollow portion 33 rises, the waterproof rubber sheet 99 is inserted between the square nut 57 and the inner wall surface of the hollow portion 33, so that it passes through the through hole of the bolt 55. Intrusion of rainwater into the indoor side is prevented.

FIG. 10 is an explanatory view of the water stop action by the lower water return protrusion when the transverse joint seal is cut.
When the horizontal joint seal (sealing material 69b) is cut and rainwater enters from the lower surface side of the draining material 100, it hits the lower water return protrusion 65 and further intrusion into the indoor side is prevented and falls into the hollow portion 33. Led. As shown in FIG. 9, the rainwater that has dropped into the hollow portion 33 in this manner is drained by the drain pipe 97.

FIG. 11 is an explanatory view of the water stop action by the lower gasket when the transverse joint seal is broken.
Further, rainwater that has entered the indoor side beyond the lower water return protrusion 65 is prevented from further intrusion by the lower gasket 73 sandwiched between the lower extruded cement plate 11 and the angle steel 41, It does not flow into the room.

  Therefore, according to the drainage material 100 described above, the outer drainage 45 and the inner drainage 49 are integrally formed, the upper water return protrusion 63 is provided on the rising portion 47 of the inner drainage 49, and the hollow portion 33 is suspended from the outer drainage 45. Since the lower water return protrusion 65 is provided, rainwater entering the upper surface side of the outer drainage 45 and trying to propagate upward through the rising portion 47 due to surface tension or the like is blocked by the upper water return protrusion 63 and is difficult to enter. At the same time, rainwater that has entered from the lower surface side of the outer drainage 45 hits the lower water return projection 65 and is guided downward, and falls to the hollow portion 33, thereby preventing rainwater from entering the lower surface side of the inner drainage. . As a result, it is possible to easily realize a high water stop function that reliably prevents the intrusion of rainwater into the room with a single member.

  In addition, according to the waterproof seal structure of the above-mentioned extruded cement board joint part, the drainage material 100 is provided in the joint part 42 and is in close contact with the back surface 9a of the upper extruded cement board 9 and the rising part 47 of the internal drainage 49. Since the upper gasket 71 is placed on the upper surface of the upper water return protrusion 63, the primary water stop line is formed by the sealing materials 69a and 69b, the secondary water stop line is formed by the upper water return protrusion 63, and the upper A tertiary water stop line is formed by the gasket 71, so that intrusion of water leakage to the indoor side can be prevented in triplicate, and water tightness can be greatly improved.

It is a longitudinal cross-sectional view of the waterproof seal structure of the extrusion-molded cement board joint part which concerns on this invention. It is a perspective view of the waterproof seal structure shown in FIG. It is sectional drawing of the drainage pipe vicinity. It is a detailed perspective view of a draining joint part. It is a longitudinal cross-sectional view of the lowest part. It is a water stop action explanatory drawing at the time of a vertical joint seal being cut. It is explanatory drawing of the water stop effect | action by the upper gasket at the time of a transverse joint seal being cut. It is water stop action explanatory drawing by the upper water return protrusion at the time of a transverse joint seal being cut. It is a bottom water stop action explanatory drawing. It is water-stopping explanatory drawing by the lower water return protrusion at the time of a transverse joint seal being cut. It is explanatory drawing of the water stop effect | action by the lower gasket at the time of a transverse joint seal being cut. It is a longitudinal cross-sectional view of the conventional waterproof seal structure using a back-to-back support member. It is a longitudinal cross-sectional view of the conventional waterproof seal structure using the connection steel materials extended up and down. It is a longitudinal cross-sectional view of the conventional waterproof seal structure in which the joint was located below the interlayer slab.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 9, 11 ... Extrusion-molded cement board, 9a, 11a ... Back surface, 33 ... Hollow part, 41, 43 ... Angle iron steel (support member), 42 ... Joint part, 45 ... Outer draining, 47 ... Rising part, 49 ... Inner draining 63 ... Upper water return protrusion, 65 ... Lower water return protrusion, 67 ... Swelling part, 69a, 69b ... Sealing material, 71 ... Upper gasket, 73 ... Lower gasket, 77, 97 ... Drain pipe, 77a ... Falling down Part, 100 ... draining material for extrusion-molded cement board

Claims (7)

Extrusion molding that is provided at the joint between adjacent upper and lower extruded cement plates when attaching an extruded cement plate having through-holes that open at the upper and lower end surfaces to the building frame via a support member adjacent to the upper and lower sides. Draining material for cement board,
An outer drain with the leading edge projecting from the surface of the extruded cement board and an inner drain with a rising portion that rises in parallel with the rear surface of the extruded cement board are formed integrally with the rear edge of the outer drain. ,
A draining material for an extrusion-molded cement board, wherein an upper water return protrusion protruding toward the back surface is provided at the rising part, and a lower water return protrusion depending on the hollow part is provided at the external drainer. .   2. A draining material for an extrusion-molded cement board according to claim 1, wherein a bulging portion projecting downward is formed at a front end edge of the outer drainage so as to extend in a longitudinal direction of the outer drainage. The drainage material for an extruded cement board according to claim 1 or claim 2 is a waterproof seal structure for an extruded cement board joint part provided in the joint part,
Between the lower end surface on the surface side of the upper extruded cement board and the external drainage, and between the upper end surface on the surface side of the lower extruded cement board and the external drainage, are blocked by the sealing material,
A waterproof seal structure for an extrusion-molded cement board joint portion, wherein an upper gasket that is in close contact with the back surface of the upper extrusion-molded cement board and the rising portion of the internal water drainage is placed on the upper surface of the upper water return protrusion. The lower end of the upper extruded cement board is supported by the horizontal piece of the support member with the drainage material for the extruded cement board interposed therebetween,
4. The waterproof seal structure for an extruded cement board joint portion according to claim 3, wherein a lower gasket is inserted in a gap between a rear upper end surface of the lower extruded cement board and the horizontal piece.   The drain pipe which makes a base end open by the said joint part, and opens a front-end | tip outside is provided in contact with the upper surface of the said draining material for extrusion-molded cement boards, The claim 3 or 4 characterized by the above-mentioned. Waterproof sealing structure for the extruded cement plate joint part.   6. The waterproof seal structure for an extrusion-molded cement board joint portion according to claim 5, wherein the drainage pipe has a falling portion that is bent downward. The waterproof seal structure for an extrusion-molded cement board joint portion according to any one of claims 3 to 6, wherein the joint portion is disposed on an upper side of the interlayer slab.

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