JP4989270B2 - Ventilation structure in outer heat insulation structure - Google Patents

Description

  The present invention relates to a ventilation structure in an outer heat insulating structure in which a heat insulating layer and a precast concrete plate are provided outside a structural housing.

  The outer heat insulating structure is a structure in which a heat insulating material provided on the inside of a wall is conventionally exposed to the outside of the structural housing or the wall so as to cover the wall itself (for example, Patent Document 1 or Patent Document 2). reference).

  As one of the outer heat insulating structures, there is an outer heat insulating structure in which a heat insulating layer and a precast concrete plate are provided on the outside of the structural frame. There are few examples of attaching a precast concrete plate to the outer wall of a building that is thermally insulated, and it can be divided into a type with an air layer and a type without an air layer. For types with an air layer, all layers of the air layer communicate with each other, the exterior plate joints are sealed, air enters from the foundation beams, and is exhausted from the eaves, upper horizontal joints provided for each layer In addition, there are those in which air enters and exits from the lower horizontal joints (however, each drainage part is attached in a shape protruding from the joints of the exterior plate), and in which the air layer is sealed. Here, from the viewpoint of preventing freezing of internal dew condensation water, the air layer is preferably in communication with the outside. On the other hand, if a drainer or the like is provided, the outer wall cannot be configured with a clean plane due to design restrictions.

  Therefore, as an example of the outer heat insulating structure in which the air layer communicates with the outside and does not have draining, there is the one shown in the vertical sectional view of FIG. In this outer heat insulating structure, a heat insulating layer 102 and a precast concrete plate 103 as an exterior material are provided on the outside of the wall column 101 constituting the structural frame. A groove 104 is formed on the outer surface of the heat insulating layer 102, and a ventilation layer (air layer) 105 is configured by the groove 104. The precast concrete plates 103 and 103 arranged in the vertical direction are arranged at a predetermined interval, and an air passage 106 is formed by a gap between the precast concrete plates 103 and 103. 105 is configured to allow air to flow therethrough.

  By the way, in a building in a cold region, if rainwater or the like continues to enter the ventilation layer 105 from the ventilation path 106, the water freezes, adversely affects the heat insulating material, or expands due to freezing and causes deformation of the member. It may be lost. In addition, it will not be a big problem if rain water etc. are temporary. Therefore, the ventilation structure between the precast concrete plates 103 and 103 constituting the ventilation path 106 is configured as follows in order to ensure a water stop effect.

A rising portion 107 that rises upward is formed on the inner side (inside the building) of the upper end surface of the precast concrete plate 103 disposed on the lower side, and the lower end surface of the precast concrete plate 103 disposed on the upper side is formed. A recess 108 that is recessed upward is formed in the inner portion. The upper precast concrete plate 103 and the lower precast concrete plate 103 are arranged such that the upright portion 107 is inserted into the notch 108 and a predetermined gap is formed between them, and the inner side when viewed from the cross-sectional direction. A vent path 106 that is bent so that the portion faces upward is formed. According to such a configuration, ventilation performance can be ensured, and even if rainwater or the like enters the outside portion of the ventilation path 106, it is blocked by the upright portion 107 of the inside portion, so that waterproof performance is obtained. be able to. Therefore, water does not enter the ventilation layer 105 except during storms. In addition, the upper surface of the upright portion 107 and the lower surface of the notch portion 108 are both inclined so that the inner side is higher, and is configured to enhance the water stop performance. In addition, the water stop effect of the atomized rainwater increases as the upright portion is increased and the cross section of the air flow path in the joint portion is increased.
JP 2003-301546 A JP 2002-227320 A

  However, in the above-described conventional ventilation structure, the lower end portion of the upper precast concrete plate 103 is positioned below the upper end portion of the upright portion 107 of the lower precast concrete plate 103 so that the precast concrete plates 103 and 103 are connected to each other. Are arranged so as to mesh with each other, the precast concrete plates 103 and 103 are likely to come into contact with each other during construction, and the precast concrete plate 103 is likely to be damaged. In particular, the protruding corner portion at the inner upper end of the upright portion 107 is thin, so there is a possibility that it may be damaged even if it touches a little.

  Further, since the precast concrete slabs 103 and 103 are arranged at a predetermined interval from each other, there is a problem that much time and effort are required for positioning at the construction site.

  Therefore, the present invention has been devised to solve the above-mentioned problems, and provides a ventilation structure in an outer heat insulating structure that can prevent the precast concrete plate from being damaged and can reduce the labor and time of construction. Let it be an issue.

In order to solve the above-mentioned problems, an invention according to claim 1 is a ventilation structure between precast concrete plates arranged in the vertical direction in an outer heat insulating structure in which a heat insulating layer and a precast concrete plate are provided outside a structural casing. Forming a notch that is recessed upward in the inner part of the lower end surface of the precast concrete plate disposed on the upper side, forming the upper end surface of the precast concrete plate disposed on the lower side in a horizontal plane, A dam member made of an elastic water-stopping material is provided at a position opposite to the notch portion of the precast concrete plate disposed on the upper surface of the precast concrete plate, and the thickness of the precast concrete plate is provided on the dam member. A ventilation structure in an outer heat insulating structure, wherein a resin ventilation member having a ventilation path extending in a vertical direction is provided.

Here, the inside of the precast concrete plate indicates the inside of the building, and indicates the heat insulating layer side of the precast concrete plate. According to the above-described configuration, the upper precast concrete plate is provided with the weir member made of an elastic water stop material on the upper end surface of the lower precast concrete plate, and further provided with the resin ventilation member thereon. The precast concrete plates can be arranged so as to mesh with each other without positioning the upper end surface of the lower precast concrete plate at a position higher than the lower end surface. Therefore, the precast concrete plates can be prevented from contacting each other, and the lower end portion of the upper precast concrete plate is in contact with the ventilation member or the weir member. Since these members are softer than the precast concrete plate, Breakage of the concrete plate can be prevented. In addition, since the weir member and the ventilation member serve as a spacer between the precast concrete plates, the vertical positioning between the precast concrete plates can be easily and accurately performed at the construction site. And time can be reduced. Further, in such a ventilation structure, air can flow to the ventilation layer through the ventilation member. On the other hand, rainwater and the like are blocked by the dam member, so that both the ventilation performance and the water stopping performance can be obtained at the same time. Furthermore, since it is not necessary to perform a process for providing a step in the part of the formwork corresponding to the upper end surface of the precast concrete plate arranged on the lower side, it is possible to reduce the construction labor and time in the production of the precast concrete plate. Cost reduction can be achieved.

The invention according to claim 2 is characterized in that the precast concrete plate is disposed between an outer portion of the upper end surface of the precast concrete plate disposed on the lower side and an outer portion of the lower end surface of the precast concrete plate disposed on the upper side. 2. The ventilation structure in the outer heat insulating structure according to claim 1, wherein a resin-made second ventilation member having a ventilation path extending in the thickness direction is provided.

  Here, the outside of the precast concrete slab indicates the outside of the building, and indicates the outer surface of the precast concrete slab. According to the above configuration, the ventilation member and the weir member are interposed in the inner portion of the gap between the upper end surface and the lower end surface of the precast concrete plate arranged in the vertical direction, and the second ventilation is provided in the outer portion. Since the members are interposed, the role of the spacer can be obtained at two points, the inner part and the outer part between the precast concrete plates, and the vertical positioning between the precast concrete plates can be easily and accurately performed at the construction site. This can be done, and the labor and time of construction can be reduced. Further, by providing the second ventilation member near the outside of the gap between the precast concrete plates, the momentum of blowing rainwater or the like can be reduced, so that the water stopping performance can be improved.

According to a third aspect of the present invention, the ventilation member is formed by laminating a plurality of plate materials having a plurality of projections provided on the surface at a predetermined pitch, and a gap between the projections constitutes the ventilation path. The ventilation structure in the outer heat insulating structure according to claim 1 or claim 2, characterized in that.

  According to the above-described configuration, the ventilation member serves as a spacer by supporting the load with the projection, and the projection provided at a predetermined pitch constitutes the ventilation path. Moreover, since the ventilation member can be provided with flexibility and can be deformed following the shape of the precast concrete plate, it can be attached without gaps by easy construction.

  According to the present invention, it is possible to prevent the precast concrete plate from being damaged, and to exhibit excellent effects such as reduction in construction labor and time.

  The best mode for carrying out the present invention will be described in detail with reference to the accompanying drawings.

  In the present embodiment, an explanation will be given by taking an example in which the structural frame is composed of field-made reinforced concrete wall columns.

  As shown in FIG. 1, the heat insulating layer 10 and the precast concrete plate 30 in the ventilation structure 1 in the outer heat insulating structure according to the present embodiment are provided outside the structural housing 50. The heat insulating layer 10 is disposed in contact with the outer surface (outside of the building) of the wall column 51 that is the structural housing 50 and is fixed by being sandwiched between the precast concrete plate 30 and the wall column 51. . The heat insulation layer 10 is composed of, for example, an FP plate (heat insulation material made of polystyrene foam) having a thickness of 100 mm, and a groove 11 extending in the vertical direction is formed on the outer surface (precast concrete plate 30 side). Yes. A precast concrete plate 30 is fixed in contact with the outer surface of the heat insulating layer 10, and a ventilation layer 12 is defined by the inner surface (inside of the building) of the precast concrete plate 30 and the groove 11. . The groove 11 is formed to a depth of 25 mm, for example.

  The groove 11 is formed so as to communicate from the upper end to the lower end of the heat insulating layer 10 as shown in the white portions of FIG. 6, so that the ventilation layer 12 (see FIG. 1) communicates above and below the heat insulating layer 10. It is configured. Moreover, the groove | channel 11 is also connected also to the horizontal direction and is comprised so that air may distribute | circulate right and left and up and down inside the precast concrete plate 30. FIG. In addition, in FIG. 6, a dashed-two dotted line shows members other than the precast concrete plate 30 and the heat insulation layer 10 attached to the circumference | surroundings.

  As shown in FIG. 5, the precast concrete plate 30 is a reinforced concrete plate material formed in advance in a factory or the like, and in this embodiment, the outer surface is formed into a concrete-released specification. In the present embodiment, the outside of the precast concrete plate 30 indicates the outside of the building, and the inside of the precast concrete plate 30 is the side where the heat insulating layer 10 and the structural frame 50 are located on the inside of the building. Show.

  As shown in FIG. 4A, the precast concrete plate 30 is provided with a separator 14 for pressing the heat insulating layer 10 and positioning a formwork (not shown) when the wall column 51 is placed. It has been. The separator 14 is configured such that one end is embedded in the precast concrete plate 30 and the other end extends inward (on the wall column 51 side). The separator 14 is configured by a screw rod, and the separator 14 is screwed with a heat insulating layer pressing member 15 that presses the heat insulating layer 10 and a mold pressing member 16 that presses the mold of the wall column 51. It has become. The separator 14 is divided into a precast concrete plate side separator 14a and a wall column side separator 14b, and a heat insulating layer pressing member 15 is screwed to an end of the precast concrete plate side separator 14a. By screwing the wall column side separator 14b, the precast concrete plate side separator 14a and the wall column side separator 14b are integrally connected. The formwork pressing member 16 is screwed to the tip of the wall column side separator 14b. According to such a configuration, when the precast concrete plate 30 is transported, the wall column side separator 14b does not need to be provided, so that only the heat insulating layer pressing member 15 having a short protruding length protrudes from the surface of the heat insulating layer 10. It becomes easy to carry. And the wall pillar side separator 14b should just be attached at the time of the assembly of the wall pillar 51 formwork. As shown in FIG. 5, the precast concrete plate side separator 14 a having such a configuration is provided over substantially the entire surface of the precast concrete plate 30 at a predetermined pitch.

  As shown in Japanese Patent Application Laid-Open No. 2004-324138, a precast concrete slab is formed by fixing a wall through a fixed hardware in which flange portions are integrally welded to both ends of a cylindrical main body made of a steel square pipe. It is fixed to the pillar.

  As shown in FIG. 1, in the joint portion between the precast concrete plates 30 and 30 arranged in the vertical direction, the inner portion of the lower end surface of the precast concrete plate 30 arranged on the upper side has a notch that is recessed upward 32 is formed. The notch 32 is formed so as to notch the protruding corner portion where the lower end surface and the inner surface of the precast concrete plate 30 intersect, and the depth is formed to the same dimension as the joint 31 (approximately 20 mm). ing. The width of the notch 32 is formed to be approximately half the thickness of the precast concrete plate 30, and the upper bottom surface 32 a serving as the bottom of the notch 32 is formed in a planar shape. The step part 32b which becomes the side surface of the notch part 32 is formed so as to be inclined upward as it goes inward, and the center part of the step part 32b is the center in the thickness direction of the precast concrete plate 30. Is consistent with the department. The notch 32 is formed continuously in the width direction (the front and back direction of the paper surface) of the precast concrete plate 30.

  At the joint portion between the precast concrete plates 30 and 30 arranged in the vertical direction, the upper end surface of the precast concrete plate 30 arranged on the lower side is formed in a horizontal flat shape. A weir member 33 made of an elastic water-stopping material is provided at a position facing the notch 32 of the precast concrete plate 30 disposed on the upper end surface of the upper end surface. Further, a resin-made ventilation member 40 having a ventilation passage 41 extending in the thickness direction of the precast concrete plate 30 (left-right direction in FIG. 1) is provided on the weir member 33. For example, a clearance of about 20 mm is secured between the precast concrete plates 30 arranged in the vertical direction, and joints 31 are formed. The clearance dimension H <b> 1 is the height dimension of the joint 31.

  The weir member 33 is made of an elastic foam such as foamed rubber having closed cells, for example, and has a long rectangular parallelepiped shape along the upper end surface of the precast concrete plate 30. The weir member 33 has a width dimension W1 (dimension direction dimension of the precast concrete plate 30) shorter than the width dimension W0 (thickness direction dimension of the precast concrete plate 30) of the upper bottom surface 32a of the notch 32. . Further, the height dimension H2 of the weir member 33 is equal to or longer than the height dimension H1 of the joint 31 in a state compressed between the precast concrete plates 30 and 30 (in the present embodiment). , Equivalent to the height dimension of the joint 31). That is, the weir member 33 has an upper end surface at the same height as or higher than the lower end surface (upper bottom surface 32a) of the outer portion of the precast concrete plate 30 disposed on the upper side (same in this embodiment). (Height position).

  As shown in FIG. 2, the dam member 33 is formed by laminating two tape-like dam members 33a and 33b. An adhesive layer 34 is formed on one side of each of the tape-like dam members 33a and 33b, and the tape-like dam members 33a and 33b are provided so that the adhesive layer 34 is on the lower side. That is, the entire lower surface of the tape-like dam member 33a is fixed to the upper end surface of the precast concrete plate 30 in a watertight state by the adhesive layer 34 of the lower tape-like dam member 33a. By the adhesive layer 34, the upper and lower tape-like weir members 33a and 33b are fixed in a watertight state. The tape-like weir members 33a and 33b are wound in a roll shape before being attached, and are pasted at a factory or a construction site. At this time, since the tape-like dam members 33a and 33b are made of an elastic foam, the tape-like dam members 33a and 33b have flexibility and can be easily stored and transported by being wound in a roll shape. Furthermore, the adhesive layer 34 can be easily fixed simply by pressing it against the object to be applied at the time of application. After the application, the tape-like weir members 33a and 33b can be easily cut with a cutter or the like. And time can be greatly reduced.

  As shown in FIG. 8, the dam member 33 is formed by laminating three tape-like dam members 33a, 33b, and 33c, and the upper end surface is the lower end surface of the outer portion of the precast concrete plate 30 disposed on the upper side. You may form so that it may become a higher position. In this way, the water stop effect can be further enhanced. In this case, the notch 32 has a notch depth that is the same as the height of the weir member 33 (thickness of one tape-like weir member 33c).

  The ventilation member 40 is made of a resin material that is a polymer member mainly composed of polypropylene. The ventilation member 40 is formed by laminating a plurality of plate members 44 having a plurality of protrusions 43 provided on the surface thereof at a predetermined pitch, and has a long rectangular parallelepiped shape along the upper end surface of the precast concrete plate 30. The ventilation member 40 has a width dimension W2 (a dimension in the thickness direction of the precast concrete plate 30) equivalent to the width dimension W1 of the weir member 33, and is compressed between the precast concrete plates 30 and 30, 31 has a height dimension equivalent to the height dimension H1 (= height dimension H2 of the weir member 33). As a result, the height at which the ventilation member 40 is laminated on the weir member 33 is such that the upper end surface of the lower precast concrete plate 30 and the upper bottom surface 32a of the notch 32 on the lower end surface of the upper precast concrete plate 30 It is equivalent to the dimension between. As shown in FIG. 1, the ventilation member 40 is disposed immediately above the dam member 33, and includes an inner surface of the upper precast concrete plate 30, an inner side surface of the ventilation member 40, an inner side surface of the dam member 33, and a lower surface. The inner surface of the precast concrete plate 30 on the side becomes the same plane.

  As shown in FIG. 2, the protrusions 43 are arranged in a staggered pattern on the surface of the plate member 44, and the air passage 41 is between the protrusions 43 adjacent in the longitudinal direction of the ventilation member 40 in the width direction of the ventilation member 40. It will be formed extending in the thickness direction of the precast concrete plate 30.

  In the present embodiment, as shown in FIG. 1, the ventilation member 40 includes an outer portion of the upper end surface of the precast concrete plate 30 disposed on the lower side and an outer side of the lower end surface of the precast concrete plate 30 disposed on the upper side. It is also provided between the parts. The second ventilation member 40 located outside is disposed about 10 mm inside from the outer surface of the precast concrete plate 30, and the joint 31 is formed in a rectangular cross section. The second ventilation member 40 is arranged such that the inner side surface is flush with the outer end portion of the notch 32 (outer end portion of the stepped portion 32b). As a result, a space 45 is provided between the second ventilation member 40 and the inner weir member 33 and the ventilation member 40, and external air flows from the outer second ventilation member 40. , Flows upward in the space 45 and flows to the ventilation layer 12 through the inner ventilation member 40.

  FIGS. 3A and 3B are horizontal cross-sectional views showing the ventilation structure 1 in the outer heat insulating structure according to the present invention. The notch 32 (see FIG. 1) of the precast concrete plate 30 is formed up to the end 11a of the portion where the groove 11 of the heat insulating layer 10 is formed as viewed in the horizontal direction. , It is not formed near the end in the length direction (left and right direction in FIG. 3). That is, the inner portion of the precast concrete plate 30 on the left side (end portion side) of the end portion 11a of the groove 11 in FIG. ing. On the left side of the end portion 11a of the groove 11, the gap between the precast concrete plates 30 is approximately 20 mm, and a portion that contacts the outside air is filled with a sealing material 46. The sealing material 46 is constructed so that the surface thereof is substantially flush with the surface of the precast concrete plate 30, and extends from the outer surface of the precast concrete plate 30 to the side surface (end surface) and the inner surface. The portion where the heat insulating layer 10 is provided is formed up to a slightly inserted portion. A dam member 47 is provided in a portion in contact with the heat insulating layer 10 and a portion in contact with the dam member 33 and the ventilation member 40 other than the portion filled with the sealing material 46. This dam member 47 is also formed by laminating two layers of tape-like dam members like the other dam members 33, and has a height equivalent to the dimension (approximately 20 mm) of the gap between the upper and lower precast concrete plates 30 and 30. Is formed. The sash 52 is fixed to the wall column 51 by a connecting member (not shown). A sealing material is provided between the precast concrete plate 30 and the sash 52.

  According to the configuration as described above, the outside of the building and the ventilation layer 12 formed on the inside of the precast concrete plate 30 are, as shown in FIG. 1 and FIG. The air passage 41, the space 45 between the outer ventilation member 40 and the inner ventilation member 40, and the ventilation passage 41 of the inner ventilation member 40 communicate with each other. Moreover, as shown in FIG. 1 and FIG. 3B, the outside of the building and the air-permeable layer 12 formed inside the precast concrete plate 30 are inside the gap between the upper and lower precast concrete plates 30 and 30. It is partitioned by the dam member 33 provided in the part, and rainwater etc. are dammed up.

Next, the effects of the present invention will be described while explaining the assembly process of the precast concrete plate 30 having the above-described configuration and the heat insulating layer 10 and the construction process at the construction site.

  A separately formed heat insulating layer 10 is attached to the inner surface of the precast concrete plate 30. A through hole 27 (see FIG. 6) for the fixed hardware 20 and a through hole (not shown) for the separator 14 are formed in the heat insulating layer 10, and the fixed hardware 20 and the separator 14 smoothly pass the heat insulating layer 10. To penetrate. And the heat insulation layer holding | suppressing member 15 is screwed together at the front-end | tip of the separator 14, and the heat insulation layer 10 is fixed. A heat insulating material 28 is filled in the gap between the fixed hardware 20 and the through hole 27. As a result, it is possible to prevent a decrease in heat insulation performance between the building exterior and the structural housing 50. Moreover, since the fixed hardware 20 is covered with the heat insulating coating layer 23, heat transfer from the precast concrete plate 30 to the structural frame 50 can be prevented. Here, since the groove 11 is formed in the heat insulation layer 10, the ventilation layer 12 is formed between the precast concrete plate 30 and the heat insulation layer 10 only by being attached to the precast concrete plate 30.

  Thereafter, the weir member 33 and the ventilation member 40 are fixed to the upper end surface of the precast concrete plate 30. At this time, since the ventilation member 40 is made of a resin-based material mainly composed of polypropylene, even if the attachment portion is curved, it can follow along with the weir member 33 and is fixed without a gap. can do.

  Since the weir member 33 made of an elastic water blocking material is provided on the upper end surface of the lower precast concrete plate 30 and the resin ventilation member 40 is further provided thereon, the precast concrete plate 30 fixed to the wall column 51 is provided. When a new precast concrete plate 30 is assembled on the upper side, the upper end surface of the lower precast concrete plate 30 is not positioned higher than the lower end surface of the upper precast concrete plate 30. Therefore, it can prevent that the precast concrete plates 30 and 30 contact. And since the lower end part of the upper side precast concrete plate 30 contacted the ventilation member 40 or the weir member 33, since these members are soft, damage to the precast concrete plate 30 can be prevented. Furthermore, the step 32b of the notch 32 is formed to be inclined and the angle of the protruding corner becomes an obtuse angle, so that the breakability of the precast concrete plate 30 can be further reduced.

  When the precast concrete plate 30 is installed, the weir member 33 is compressed by placing the precast concrete plate 30 on the upper side, so that the water stop performance of the weir member 33 itself is improved and the top of the precast concrete plate 30 is Adhesion with the end face is also improved. Further, the ventilation member 40 is compressed by the precast concrete plate 30, so that the adhesion with the precast concrete plate 30 and the weir member 33 is enhanced. The upper and lower precast concrete slabs 30 are fixed to each other via a connection plate 36 (see FIGS. 3, 4B, 5 and 6).

  According to the ventilation structure 1 having such a configuration, the outside air flows from the outside second ventilation member 40, the space 45 between the outside ventilation member 40 and the inside weir member 33 and the ventilation member 40, and the inside air. It passes through the ventilation member 40 and flows into the internal ventilation layer 12 to obtain ventilation performance. Here, each precast concrete plate 30, 30 is a weir member 33 provided at the upper end of the lower precast concrete plate 30 in the notch 32 at the lower end surface of the upper precast concrete plate 30 at the joint portion. And the ventilation member 40 enters, and the precast concrete plates 30 and 30 are arranged so as to mesh with each other, so that the air flows between the outer second ventilation member 40 and the inner weir member 33 and the ventilation member 40. It is bent once in the space 45 and flows into the inner ventilation layer 12. Therefore, even in the case of storm, the momentum of the strong wind is relieved in the space 45, and rainwater or the like passes through the ventilation member 40 together with the air and most of the rainwater enters the ventilation layer 12. Can be prevented. In addition, since the second ventilation member 40 is provided near the outer side of the gap between the precast concrete plates 30 and 30, rainwater or the like hits the projection 43, so that the momentum of blowing rainwater or the like can be reduced. The performance can be further enhanced. In addition, since the protrusions 43 are arranged in a staggered manner, even if it is foggy rain, it can be formed into water droplets by contacting the protrusions 43 when passing through the air passage 41, improving the water stop performance. ing. Further, the ventilation member 40 has a narrow air passage 41 so that air and water can pass through, but dust and dead leaves can be stopped, and dust and dead leaves are prevented from entering the building. can do.

  If there is no longer a condition for rainwater to blow into the joint 31 because the rain stops, etc., the rainwater that has been blocked by the weir member 33 passes through the second vent member 40 on the outside and has been discharged to the outside. Is done.

  Furthermore, since the ventilation member 40 and the weir member 33 are easily compressed and deformed, it is possible to make them adhere to each other without forming a gap between the concrete surface and each member surface simply by installing the precast concrete plate 30. .

  Further, the weir member 33 is formed so that the upper end surface thereof is at the same height as the lower end surface of the outer portion of the precast concrete plate 30 disposed on the upper side, so that rainwater or the like is placed on the upper and lower precast concrete plates. Even if it is blown into the gap between 30 and 30 and accumulates up to the entire height of the gap (height H1 of the joint 31), rainwater hits the weir member 33. Can be dammed up. In addition, when the water-stopping confirmation test was performed under the storm conditions actually assumed using the blower and the shower range with the ventilation structure 1 having the above-described configuration, there is no ingress of water and sufficient water-stopping performance can be obtained. Has been confirmed. In addition, when the precast concrete plate 30 integrated with the heat insulating layer 10 is started up, smoke is emitted from the outside and the lower portion, and a breathability check test is performed, smoke flows out from each portion, and sufficient ventilation performance can be obtained. It has been confirmed.

  FIG. 7 is a cross-sectional view showing another best mode for carrying out the ventilation structure in the outer heat insulating structure according to the present invention.

  In the ventilation structure 1 according to the present embodiment, a ridge 35 is formed on the inner side of the upper end surface of the precast concrete plate 30 disposed on the lower side. The ridge 35 is formed such that its upper end surface 35a is located at a lower height than the lower end surface of the outer portion of the precast concrete plate 30 disposed on the upper side. In the present embodiment, the height of the protruding portion 35 is substantially half the height dimension H1 of the joint 31 and is the same height as the tape-like weir member 33c. The step portion 35b on the outer side of the ridge portion 35 is formed to be inclined, and is configured such that the outer protruding corner portion of the ridge portion 35 has an obtuse angle. A dam member 48 is affixed on the protrusion 35. The dam member 48 is constituted by a single tape-like dam member 33c, and the height position of the upper end surface of the dam member 48 is the height of the lower end surface of the outer portion of the precast concrete plate 30 disposed on the upper side. It is designed to be equivalent to the position. Since other configurations are the same as those of the embodiment shown in FIG. 1, the same members are denoted by the same reference numerals and the description thereof is omitted.

  According to such a configuration, even if the dam member 48 is broken by forming the ridge portion 35 on the upper end surface of the precast concrete plate 30, rainwater or the like is reliably dammed by the ridge portion 35. The water stop performance is not lost. And since the dam member 48 is provided on the protrusion part 35, the water stop performance equivalent to the said embodiment can be obtained.

  As mentioned above, although the form for implementing this invention was demonstrated, this invention is not limited to the said embodiment, In the range which does not deviate from the meaning of this invention, a design change is possible suitably. For example, in the above-described embodiment, the dam member 33 is configured by laminating two tape-like dam members 33a and 33b. However, the present invention is not limited to this, and an integrated elastic foam is attached. Of course, there is no problem.

  Moreover, in the said embodiment, although the dam member 33 is formed so that the upper end surface and the lower end surface of the upper precast concrete plate 30 may become the same height, the upper end surface of the dam member 33 is further It may be a high position.

It is sectional drawing which showed the best form for implementing the ventilation structure in the outer heat insulation structure which concerns on this invention. It is the partially exploded perspective view which showed the dam member and ventilation member of the ventilation structure in the outer heat insulation structure which concern on this invention. (A) is the horizontal direction sectional view cut by the AA line of FIG. 1, (b) is the horizontal direction sectional view cut by the BB line of FIG. FIG. 4A is a vertical sectional view taken along line CC in FIG. 3A, and FIG. 4B is a vertical sectional view taken along line DD in FIG. It is the side view which looked at the precast concrete board of the ventilation structure in the outside heat insulation structure concerning the present invention from the inside. It is the side view which looked at the heat insulation layer of the ventilation structure in the outer heat insulation structure which concerns on this invention from the outer side. It is sectional drawing which showed the best other form for implementing the ventilation structure in the outer heat insulation structure which concerns on this invention. It is sectional drawing which showed the further another form for implementing the ventilation structure in the outer heat insulation structure which concerns on this invention. It is sectional drawing which showed the ventilation structure in the conventional external heat insulation structure.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Ventilation structure 10 Heat insulation layer 12 Ventilation layer 30 Precast concrete plate 32 Notch part 33 Weir member 40 Ventilation member 41 Ventilation path 43 Projection part 44 Plate material 50 Structure frame

Claims (3)

A ventilation structure between precast concrete plates arranged in the vertical direction in an outer heat insulating structure in which a heat insulating layer and a precast concrete plate are provided outside the structural frame,
Form a notch that is recessed upward in the inner part of the lower end surface of the precast concrete plate placed on the upper side,
The upper end surface of the precast concrete plate placed on the lower side is formed into a horizontal plane,
A weir member made of an elastic water-stopping material is provided at a position facing the notch of the precast concrete plate disposed on the upper end surface of the precast concrete plate, and the precast concrete plate is placed on the weir member. A ventilation structure in an outer heat insulating structure, characterized in that a resin-made ventilation member having a ventilation path extending in the thickness direction is provided. An air passage extending in the thickness direction of the precast concrete plate between the outer portion of the upper end surface of the precast concrete plate disposed on the lower side and the outer portion of the lower end surface of the precast concrete plate disposed on the upper side The ventilation structure in the outer heat insulation structure according to claim 1, wherein a second ventilation member made of a resin having the above is provided. The vent member has a plurality of protrusions on the surface is formed by stacking a plurality of plate members disposed at a predetermined pitch, the gap between the protrusions, claim 1, characterized in that forming the air passage or The ventilation structure in the outer heat insulating structure according to claim 2 .

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