JP6562502B2 - Building exterior wall structure - Google Patents

Description

  This description relates to the outer wall structure of a building.

  Many types of outer wall structures using lightweight cellular concrete panels (hereinafter also referred to as ALC panels) have been proposed as disclosed in Patent Document 1, etc., and are mainly used for low-rise wooden structures. As shown in FIG. 1, there is a direct tension method in which an ALC panel 11 as an exterior panel is directly fixed to a structural frame 10 of a building with screws 12. Further, as shown in FIG. 2, waterproof paper 22 is attached to the outside of the structural plywood 21 provided on the housing 20, and a ventilation cylinder edge 23 is provided on the outside, and an ALC panel 24 as an exterior panel is provided on the ventilation cylinder edge 23. There is an aeration method in which the screw 25 is fixed.

  In a building having these outer wall structures, the degree of fire spread when exposed to fire or heat at the time of a fire in a neighboring house depends on the fire resistance performance of the exterior panel. In general, when exposed to a flame for a long time, the sealing of the panel joint portion deteriorates first, and the flame penetrates from the joint portion to carbonize the trunk edge. When the trunk edge is carbonized, the exterior panel cannot be held, and the exterior panel is displaced or dropped due to its own weight or the like. As a result, air gaps and openings are generated, from which flames enter the building and the building spreads.

  Further, in the outer wall structure using the ALC panel, the water stoppage performance depends on the joint sealing of the ALC panel directly attached to the frame in the case of the direct stretching method as shown in FIG. Therefore, if the ceiling breaks for some reason, it will leak directly into the indoor side. As a variation of the straight-line construction method, waterproof paper may be applied to the structural plywood provided between the housing and the ALC panel, so that water leakage when sealing is cut off can be stopped with waterproof paper. Since there is no space between the housing and the ALC panel, it becomes difficult to discharge the leaked water.

  On the other hand, in the case of the ventilation method as shown in FIG. 2, waterproof paper is attached to the structural plywood provided on the housing, and further, a ventilation layer is provided on the outside, so the water leaked by the joint sealing of the ALC panel is waterproof paper. Stops and is easily discharged through the vent layer. However, since this method prevents intrusion of water leakage only with waterproof paper, there is a possibility of water leakage due to poor construction or damage of the waterproof paper used.

  In addition, as shown in FIG. 3, a specification is also used in which a gypsum board 32 is double-bonded as a covering material on the outside of a structural plywood 31 provided on the housing 30. However, the water resistance performance of the gypsum board is not as high as that of the ALC panel. Therefore, it is necessary to cover the housing side surface of the inner board 32a and the ventilation layer side surface of the outer board 32b with the waterproof paper 33, respectively. In this case, if the contractor that coats the waterproof paper 33 and the contractor of the exterior material such as the gypsum board 32 are different, it is necessary to divide the building outer wall in three times, which is problematic in terms of cost and workability. There was a case.

JP 2004-244968 A

  The present invention has been made in view of the above-described conventional problems, and can prevent the damage of burning when exposed to a flame or heat due to a fire of a neighboring house, etc., and ensure excellent water stopping performance. Furthermore, it aims at providing the outer wall structure which can implement | achieve cost reduction and high workability.

In order to achieve the above object, the outer wall structure of the present invention is an outer wall structure in which lightweight cellular concrete panels are arranged in two layers with a ventilation layer in between, and the vertical joint of the first lightweight cellular concrete panel and The vertical joints of the second layer of lightweight cellular concrete panels are provided alternately, and the position of both the vertical joints is characterized by the fact that the frame of the building and the ventilator edge are provided .

  According to the present invention, it is possible to suppress the damage caused by burning when exposed to a flame or heat due to a fire in a neighboring house, etc., and it is possible to ensure excellent water stop performance, and further, cost reduction and high workability. Can be realized.

It is the fragmentary sectional view which cut | disconnected the conventional outer wall structure constructed by the direct tension construction method in the horizontal direction. It is the fragmentary sectional view which cut | disconnected the conventional outer wall structure constructed | assembled by the ventilation construction method in the horizontal direction. It is the fragmentary sectional view which cut | disconnected the conventional outer wall structure where the gypsum board was double-bonded in the horizontal direction. It is a perspective view which shows one specific example of the outer wall structure of this invention. It is the fragmentary sectional view which cut | disconnected the outer wall structure of FIG. 4 in the horizontal direction.

  Hereinafter, a specific example of the outer wall structure of the present invention will be described with reference to FIG. The outer wall structure of the building shown in FIG. 4 is a lightweight cellular concrete panel (hereinafter referred to as a coating panel) 1 for fireproof coating and thermal insulation for the first layer and a lightweight cellular concrete panel for exterior coating ( (Hereinafter referred to as an exterior panel) 2 is applied by double bonding with the ventilation layer A interposed therebetween. In this way, even if the exterior panel 2 deteriorates due to a fire and is displaced or dropped due to the double-sticking of the exterior panel 2 and the exterior panel 2 on the outer wall structure made of lightweight cellular concrete panel, the gap Or the flame and heat which penetrate | invade from opening can be prevented with the panel 1 for coating | cover, Therefore It becomes possible to extend the fire spreading time.

  As these two-layer lightweight cellular concrete panels, those formed into a rectangular shape having a predetermined thickness are generally used. Further, a flat panel is used for the front panel and the rear panel for the cover panel 1, and a flat panel for the front panel and the rear panel is used for the exterior panel 2. In the construction of these two-layer lightweight cellular concrete panels, waterproof paper 5 is pasted on the outside of the structural plywood 4 provided on the housing 3 of the building, and the covering panel 1 as the first layer is stretched on the outside. At that time, the layers are laminated so that the facing end surfaces of the covering panels 1 adjacent to each other in the vertical direction are in contact with each other. Next, a ventilation trunk edge 6 is provided outside the covering panel 1 with a predetermined interval, and the exterior panel 2 as the second layer is fixed to the outside. In this case as well, lamination is performed so that the opposing end surfaces of the exterior panel 2 adjacent in the vertical direction are in contact with each other.

  When the first and second layer panels are constructed, the vertical joint 1a of the first covering panel 1 and the vertical joint 2a of the second exterior panel 2 are viewed from a direction perpendicular to the panel surface. In order not to overlap each other, the construction is shifted in a staggered manner. Thus, by providing the vertical joint 1a of the covering panel 1 and the vertical joint 2a of the exterior panel 2 alternately, the flame and heat that has entered from the longitudinal joint portion of the exterior panel 2 are exposed to the vertical joint of the covering panel 1. You can avoid hitting the part directly. Furthermore, it is possible to prevent heat from entering the indoor side due to carbonization of the ventilator edge 6. Thereby, since it becomes possible to extend the fire spread time, the safety | security of a building can be improved.

  In addition, by sealing between the joints of the exterior panel 2, excellent water-stopping performance with a double-structured ventilation structure sandwiching the waterproof paper 5 provided on the housing side and the ventilation layer A of the lightweight cellular concrete panel described above. Can be secured. In other words, it is usually possible to ensure good water stopping performance with the joint sealing of the exterior panel 2, but even if this leaks due to deterioration or the like, the leaked water can be discharged to the outside through the ventilation layer A. Even if the exterior panel 2 is severely deteriorated and water leakage increases, the waterproof paper 5 provided on the indoor side can prevent water leakage to the indoor side.

  The lightweight cellular concrete panel is fixed with screws for covering and exterior panels. Specifically, as shown in FIG. 5, the inner covering panel 1 is fixed by fixing the fixing screw 7 penetrating the covering panel 1, the waterproof paper 5, and the structural plywood 4 to a housing 3 such as a pillar or a stud. Screw in and fix. The fixing of the ventilation cylinder edge 6 is performed by screwing a fixing screw 8 penetrating through the ventilation cylinder edge 6, the covering panel 1, the waterproof paper 5, and the structural plywood 4 into a housing 3 such as a pillar or a stud. The outer exterior panel 2 is fixed by fixing a fixing screw 9 penetrating the exterior panel 2, the ventilation trunk edge 6, the covering panel 1, the waterproof paper 5, and the structural plywood 4 to a housing 3 such as a pillar or a stud. Screw to fix. The fixing screws 7 and 9 each have their heads buried in the ALC panel when screwed, and it is preferable that the buried parts are filled with a repair material B having fire resistance.

  The above-described outer wall structure of the present invention can be applied to both a wooden frame and a steel frame. Also, since the same lightweight cellular concrete panel can be used for the covering panel and the exterior panel, it is possible to simplify the panel construction of the outer wall of the building twice, and the waterproof paper only needs to be constructed once. Overall cost reduction and process shortening are possible. In addition to shifting the vertical joint of the two-layer ALC panel as described above, the horizontal joint of the covering panel and the horizontal joint of the exterior panel may be shifted so that they do not overlap each other. Safety can be increased.

DESCRIPTION OF SYMBOLS 1 Covering panel 1a Longitudinal joint 2 Exterior panel 2a Longitudinal joint 3 Housing 4 Structure plywood 5 Waterproof paper 6 Venting trunk edge 7, 8, 9 Fixing screw A Venting layer B Repair material

Claims (3)

It is an outer wall structure in which lightweight cellular concrete panels are installed in two layers with a ventilation layer in between. The vertical joint of the first lightweight cellular concrete panel and the vertical joint of the second lightweight cellular concrete panel are staggered. The outer wall structure in which the frame of the building and the ventilator edge are provided at the positions of both the vertical joints .   The first layer and the second layer of lightweight cellular concrete panels are both fixed with a fixing screw whose tip reaches the frame of the building and whose head is buried in the lightweight cellular concrete panel. The outer wall structure according to claim 1, wherein a repair material having fire resistance is filled in the outer wall structure. The sealing is applied between the joints of the outer lightweight cellular concrete panels among the first and second lightweight cellular concrete panels, and waterproof paper is provided on the housing side of the inner lightweight cellular concrete panels. Or the outer wall structure of 2.

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