JP6938143B2 - Exterior wall structure of the building - Google Patents

Description

The present invention relates to an outer wall structure of a building in which a first outer wall made of concrete such as a pilaster and another second outer wall such as a glass curtain wall are combined to form an outer wall of the building.

In the outer wall structure of the building, for example, the thermal environment inside the building is improved by discharging the hot heat in the summer and the cold heat in the winter that stay in the perimeter, and natural ventilation by intake and exhaust between the inside and the outside of the building. It is necessary to form a ventilation path for.
Further, although the outer wall structure of the building is not a combination of the first outer wall portion made of concrete and the other second outer wall portion, in the outer wall structure of the building composed of only the outer wall portion made of concrete, for example, Patent Document 1 As shown in FIGS. 1 and 2, there is an outer wall structure of a building in which a heat insulating composite panel having a vertical ventilation path is attached to the outer surface of the concrete skeleton. In this outer wall structure, the lower end of the ventilation path formed by a plurality of heat insulating composite panels arranged in the vertical direction is formed with an opening toward the outside of the building, and the upper end of the ventilation path is formed with an opening in the parapet.

Further, the heat insulating composite panel is a precast plate semi-finished product having a recess for forming a ventilation path that opens toward the outer surface side of the concrete skeleton, and the precast plate semi-finished product in a state of closing the opening of the recess of the precast plate semi-finished product. It is composed of a heat insulating material that is fixed to the joint surface side of the skeleton. Then, by placing and solidifying the concrete that constructs the skeleton, an outer wall in which the skeleton concrete and the heat insulating composite panel are integrally joined is constructed.

Special Fair 6-51993 Gazette

Since the outer wall structure of the building of Patent Document 1 described above is composed of only the outer wall portion made of concrete, it is easy to design the building with little change in appearance. Moreover, the ventilation path of the heat insulating composite panel suppresses the deterioration of the heat insulating performance of the heat insulating material by preventing the internal dew condensation of the heat insulating layer and diverging the moisture permeation due to the difference in water vapor pressure between the indoor and outdoor areas, and the heat staying in the perimeter or the like is suppressed. -There is no cold heat discharge function or natural ventilation function by intake and exhaust between the inside of the building and the outside of the building.

Moreover, since each heat insulating composite panel arranged along the vertical plane of the outer surface of the outer wall is formed in a flat plate shape having a thickness thinner than the left and right width, the ventilation path is expanded in the left and right width direction of the heat insulating composite panel. However, there was naturally a limit to the expansion of the cross-sectional area of the ventilation path.

In addition, in the outer wall structure of a general building, measures have been taken to install vertical louvers to prevent the invasion of the sun and to provide a louver for intake and exhaust with the outside of the building on the curtain wall. Both are one of the factors that lead to soaring costs.

In view of this situation, the main problem of the present invention is that by rational modification of the first outer wall made of concrete, it is possible to effectively suppress the invasion of the west sun while improving the exterior design of the building. It is an object of the present invention to provide an outer wall structure of a building capable of easily forming a ventilation passage having a large cross-sectional area effective for improving a thermal environment while suppressing the weighting of the first outer wall portion at low cost.

The first characteristic configuration according to the present invention is the outer wall structure of a building in which the outer wall of the building is composed of a pilaster made of precast concrete and a curtain wall.
The pilasters, the more curtain wall is also formed to project building exterior side, and is formed in a shape of the cross-sectional shape of the arc inside is hollow, the internal space of the pilasters are configured air passage, the The pilaster is provided with a duct type having the ventilation passage as an indoor vertical duct and an air supply / exhaust type for supplying and exhausting air between the ventilation passage and the outside of the building, and the duct type pilaster is adjacent to the curtain wall. The point is that the air supply / exhaust type pilaster is arranged at the air supply / exhaust construction site adjacent to the curtain wall .

According to the above configuration, the concrete first outer wall portion formed so as to project to the outer side of the building from the second outer wall portion can be formed as a decorative pillar capable of suppressing the invasion of the west sun. Moreover, by forming the first outer wall portion protruding to the outer side of the building into a U-shaped cross-sectional shape in which the inside thereof is hollow, the weight of the first outer wall portion is suppressed, and the weight of the first outer wall portion is suppressed. It is possible to form a ventilation path with a large cross-sectional area that is effective for improving the thermal environment inside the building.

Therefore, by combining the first outer wall portion constituting the decorative pillar and the other second outer wall portion, it is possible to effectively suppress the invasion of the west sun while improving the exterior design of the building. Moreover, by rational modification of forming the cross-sectional shape of the first outer wall made of concrete in a U shape, ventilation with a large cross-sectional area effective for improving the thermal environment while suppressing the weighting of the first outer wall is suppressed. Roads can be easily formed at low cost.
According to the above configuration, the pilaster, which is the first outer wall having a U-shaped cross-sectional shape that constitutes the ventilation passage in the internal space, is made into a PCa to improve the efficiency of manufacturing and construction of the pilaster and reduce the cost. Can be done. Moreover, for example, pilasters arranged alternately with curtain walls along the circumferential direction of the building can obtain the same effect as installing vertical louvers. Therefore, for example, the entire outer wall of the building is composed of curtain walls. Moreover, the cost can be reduced as compared with the case where the vertical louver is installed separately.

According to the above configuration, in the duct type first outer wall portion, hot and cold heat accumulated in a perimeter or the like can be discharged as a vertical duct. In the intake / exhaust type first outer wall portion, outside air can be introduced in the middle period (spring, autumn). Therefore, it is possible to construct an air conditioning treatment system that can maintain a comfortable environment near the window throughout the year in terms of structure and cost.

The second characteristic configuration according to the present invention is that the ventilation passage of the duct type pilaster is provided with a shutter mechanism for switching between a warm air ventilation state in which warm air is ventilated and a cold air ventilation state in which cold air is ventilated.

According to the above configuration, a shutter mechanism for discharging hot and cold heat accumulated in the vicinity of the perimeter can be compactly assembled in the ventilation passage constituting the vertical duct.

The third characteristic configuration according to the present invention is that the air supply / exhaust type pilaster is formed with a slit for air supply / exhaust that communicates the ventilation passage with the outside of the building, and rainwater intrusion that suppresses the intrusion of rainwater from the slit is formed. The point is that a restraining structure is provided.

According to the above configuration, it is possible to suppress the intrusion of rainwater from the slit by the rainwater intrusion suppression structure while forming the slit for natural ventilation.
A fourth characteristic configuration according to the present invention is that a lightning protection conductor is arranged on the outer surface of the pilaster, and the lightning protection conductor is connected to a reinforcing bar in the pilaster by an electric conductor.

A perspective view showing a part of the outer wall structure of the building of the present invention. FIG. 1 is a cross-sectional view taken along the line II-II. Section III-III sectional view in FIG. FIG. 1 is a sectional view taken along line IV-IV. Horizontal cross section of duct type pilaster Perspective view of ventilation system mechanism Horizontal cross section of air supply / exhaust type pilaster A horizontal cross-sectional view showing the first lightning protection structure (a) and a horizontal cross-sectional view showing the second lightning protection structure (b) of the pilaster.

[First Embodiment]
FIG. 1 shows the outer wall structure of a building such as a high-rise building. In the present embodiment, the precast concrete pilaster (decorative pillar or pilaster) A, which is an example of the first concrete outer wall portion, and the glass curtain wall B, which is an example of the other second outer wall portion, are left and right. The outer walls of the building are constructed by combining them so that they are located alternately in the direction (circumferential direction of the building).
Pilaster A is manufactured in advance by placing concrete in a state where reinforcing bars are arranged at a PCa manufacturing site such as a PCa factory or a PCa manufacturing site. As shown in FIGS. 3 and 4, the pilaster A is configured to have a length corresponding to the height from the free access floor 4 on the lower floor to the free access floor 4 on the upper floor.
Further, at the lower and upper ends of the pilaster A, joint portions 20a and 20b are formed so as to be joined and fixed from the vertical direction to the joint portion 20b at the upper end of the pilaster A on the lower floor and the joint portion 20a at the lower end of the pilaster A on the upper floor. The pilaster A is lifted to the outer wall construction position of the skeleton 1 and piled up in the vertical direction while being joined and fixed to construct a concrete outer wall portion on the outer wall of the building.
Further, the glass curtain wall B is also constructed by constructing a glass outer wall portion on the outer wall of the building by sequentially stacking the glass curtain wall B in the vertical direction while lifting and fixing the glass curtain wall B at the outer wall construction position of the skeleton 1.

As shown in FIGS. 1, 5, and 7, the pilaster A is a hollow U-shape that is formed so as to protrude toward the outside of the building from the glass curtain wall B and the inside of the pilaster A opens toward the inside of the building. The internal space of the pilaster A, which is formed in a cross-sectional shape and is recessed in a U shape, is formed in the ventilation passage 21.
The pilaster A, which is formed so as to protrude to the outside of the building from the glass curtain wall B, can satisfactorily suppress the invasion of the west sun, and at the same time, the appearance of the building is made of a delicate vertical lattice of precast concrete pilaster A. And the glass curtain wall B can be configured into a characteristic design that is continuous in the circumferential direction of the building. Moreover, by rational modification of forming the cross-sectional shape of the concrete pilaster A into a U-shape, it is possible to reduce the weight of the pilaster A and reduce the cost of the ventilation passage 21 having a large cross-sectional area, which is effective for improving the thermal environment. Can be easily formed with.

Further, the pilaster A is between a duct type pilaster A1 having a ventilation passage 21 as an indoor vertical duct as shown in FIGS. 3 and 5 and between the ventilation passage 21 and the outside of the building as shown in FIGS. 4 and 7. It is composed of two types, the air supply / exhaust type pilaster A2 that supplies and exhausts air.
In the present embodiment, as shown in FIG. 1, the pilaster A has a column-corresponding position corresponding to both steel-framed concrete columns 2 of the skeleton 1 and an intermediate three with a predetermined interval in the left-right direction between the two steel-framed concrete columns 2. It is located in a total of 5 locations including the locations. Among them, the air supply / exhaust type pilaster A2 is arranged at the center position between the pillars, and the duct type pilaster A1 is arranged at each of the other four places.

Next, the duct type pilaster A1 will be described.
As shown in FIG. 5, the duct type pilaster A1 has a wall base 30 having a depth dimension corresponding to a frame material 71 that holds the laminated glass 70 of the glass curtain wall B in an airtight state, and a frame material of the glass curtain wall B. It is configured by integrally forming a decorative wall portion 31 having a substantially "M" -shaped cross-sectional shape that projects toward the outside of the building from the vertical frame portion 71A of 71 in a narrowed state. Among them, the decorative wall portion 31 has a pair of left and right outer ridges 31A that are formed so as to project over the entire vertical direction on both sides of the decorative wall 31 in the left-right direction, and left and right with a protrusion dimension smaller than that of both outer ridges 31A. At the central position in the direction, a central ridge portion 31B is formed so as to project over the entire area in the vertical direction.
Therefore, the outer ridges 31A and the central ridges 31B of the decorative wall 31 form an outer groove 32 having an M-shaped cross-sectional shape that opens toward the outside of the building.

Of the wall base 30 of the duct type pilaster A1, the air passage forming recess 30A forming the ventilation passage 21 as a depression has a maximum opening width slightly larger than the maximum opening width in the left-right direction of the outer groove portion 32, as shown in FIG. Moreover, it is configured to have an air passage depth that slightly enters the decorative wall portion 31 side from the wall base portion 30 (protrudes to the outside of the building from the glass curtain wall B).
Further, as shown in FIG. 3, the upper end surface 30a of the air passage forming recess 30A, which is the upper end of the ventilation passage 21, is arranged slightly above the opening of the first ceiling duct 41 in the ceiling space 8. The lower end surface 30b of the air passage forming recess 30A, which is the lower end of the ventilation passage 21, is arranged slightly above the free access floor 4 on the lower floor side.
Further, as shown in FIG. 5, among the wall bases 30 of the duct type pilaster A1, the air passage forming recesses 30A and the left and right inner end faces 30c on the building interior side continuous with the opening edge of the recesses 30c are blown with urethane foam on site. The heat insulating layer 33 is formed by the attachment.

Further, as shown in FIG. 5, a silicone sponge forming a wind barrier is formed between the left and right outer surfaces 30d of the wall base 30 of the duct type pilaster A1 and the vertical frame portion 71A of the frame member 71 of the glass curtain wall B. A packing 35 made of EPDM-S and a gasket 36 made of EPDM-S constituting the rain barrier are provided.

Further, as shown in FIG. 5, on the end surface 71a of the vertical frame portion 71A of the frame material 71 of the glass curtain wall B on the building interior side, the blind box 37 side of the glass curtain wall B and the ventilation passage 21 of the duct type pilaster A1 are provided. A vertical frame 38 for partitioning from the side is attached. Among them, an extended ventilation passage 39 that opens to the indoor side while communicating with the ventilation passage 21 of the duct type pilaster A1 is formed between the vertical frame 38s located close to the left and right sides of the duct type pilaster A1. The decorative panel 40 that closes the indoor opening of the extended ventilation passage 39 is detachably attached to the opening peripheral edges of both vertical frames 38 in a Kendon manner.
Since the lateral width of the extended ventilation passage 39 between the two vertical frames 38 is configured to be larger than the lateral width of the ventilation passage 21 of the duct type pilaster A1, the ventilation passage 21 and the extended ventilation passage 39 The cross-sectional shape of the integrated ventilation passage formed by and is convex.

As shown in FIG. 3, the lower part of the ventilation passage 21 and the extended ventilation passage 39 of the duct type pilaster A1 is formed to communicate with the underfloor chamber 5 between the floor slab 3 on the lower floor side and the free access floor 4. As shown in FIGS. 2 to 4, the underfloor chamber 5 is provided with a ventilation stopper 47 made of steel or the like for partitioning from other underfloor floors. On the other hand, the upper part of the ventilation passage 21 and the expansion ventilation passage 39 of the duct type pilaster A1 is provided with an unexpected pull fan arranged in the ceiling space 8 between the floor slab 3 on the upper floor side and the ceiling panel 7. The air connected to the first ceiling duct 41 and sucked by the pull fan is supplied as recirculated air to an air conditioner (not shown) that generates air conditioning air (hot air, cold air) and supplies it indoors, or ventilates outdoors. It is discharged.

Further, as shown in FIGS. 5 and 6, in the upper part of the ventilation passage 21 and the extended ventilation passage 39 of the duct type pilaster A1, the warm air retained by the perimeter on the glass curtain wall B side is first ceilinged in the summer. A shutter mechanism that switches between a warm air ventilation state that ventilates the inner duct 41 and a cold air ventilation state that ventilates the cold air on the lower end side of the ventilation passage 21 and the expansion ventilation passage 39 of the duct type pyraster A1 to the first ceiling duct 41 in winter. C is provided.

The shutter mechanism C is configured as follows.
An air passage switching unit case 42 having a substantially convex shape in a plan view is arranged in the upper portion of the ventilation passage 21 and the extended ventilation passage 39, and the internal space of the blind box 37 is located at the end of the blind box 37 of each glass curtain wall B. A duct receiving box 37A communicating with the above is formed. The internal space of the air passage switching unit case 42 is divided into three connecting portions, that is, a first connecting portion 42A, a second connecting portion 42B, and a third connecting portion 43C.
The duct receiving box 37A of both blind boxes 37 and the first connecting portion 42A of the air passage switching unit case 42 are communicated with each other by a flexible duct 43.
Further, the second connection portion 42B of the air passage switching unit case 42 is communicated with the ventilation passage 21 of the duct type pilaster A1, and the first ceiling duct 41 is communicated with the third connection portion 42C of the air passage switching unit case 42. do.
Inside the air passage switching unit case 42, the first connection port 44A for communicating and connecting the first connection portion 42A and the third connection portion 42C, and the second connection portion 42B and the third connection portion 42C are communicated and connected. A slide shutter 45 (see FIG. 5) that selectively opens and closes the second connection port 44B, the first connection port 44A, and the second connection port 44B, and an opening / closing drive mechanism 46 that controls the opening / closing operation of the slide shutter 45. Is provided.
Incidentally, FIG. 6A shows a state in which the second connection port 44B is closed by the slide shutter 45 (the shaded portion in FIG. 6A) to open the first connection port 44A. FIG. 6B shows a state in which the first connection port 44A is closed by the slide shutter 45 (the shaded portion in FIG. 6B) and the second connection port 44B is opened.
As shown in FIG. 3, a partition plate 48 made of steel or the like for blocking the ventilation passage 21 and the expansion ventilation passage 39 of the duct type pilaster A1 on the upper end side is provided around the air passage switching unit case 42. Has been done.

Then, during cooling in the summer, as shown in FIG. 6A, the slide shutter 45 is switched and operated so that the first connection port 44A is opened and the second connection port 44B is closed. When the pull fan is driven in this state, the warm air that stays in the perimeter on the glass curtain wall B side (see the solid line arrow in FIGS. 2, 3, and 6 (a)) is the blind box 37 → the duct receiving box 37A →. Flexible duct 43 → 1st connection part 42A of air passage switching unit case 42 → 1st connection port 44A → 3rd connection part 42C → 1st ceiling duct 41 is sucked and supplied to the air conditioner as recirculated air, or outdoors Ventilated and discharged.

Further, in winter, as shown in FIG. 2, the cold air of the perimeter on the glass curtain wall B side (see the broken line arrow in FIG. 2) can be discharged into the underfloor chamber 5. Then, in winter, as shown in FIGS. 5 and 6B, the slide shutter 45 is switched and operated in a state where the first connection port 44A is closed and the second connection port 44B is opened. When the pull fan is driven in this state, the cold air in the underfloor chamber 5 and the cold air in the ventilation passage 21 of the duct type pilaster A1 (see the broken line arrow in FIG. 3 and the solid line arrow in FIG. 6B) are switched. The unit case 42 is sucked into the second connection portion 42B → the second connection port 44B → the third connection portion 42C → the first ceiling duct 41, and is supplied to the air conditioner as recirculated air or ventilated to the outside.

Next, the air supply / exhaust type pilaster A2 will be described.
As shown in FIGS. 4 and 7, the air supply / exhaust type pilaster A2 has a wall base 50 having a depth dimension corresponding to a frame material 71 that holds the laminated glass 70 of the glass curtain wall B in an airtight state, and a glass curtain wall. The frame member 71 of B is integrally formed with a decorative wall portion 51 having a substantially “M” -shaped cross-sectional shape that projects toward the outside of the building on the outer side of the building in a narrowed state. Among them, the decorative wall portion 51 has a pair of left and right outer ridges 51A that are formed so as to project over the entire area in the vertical direction on both left and right sides thereof, and left and right with a protrusion dimension smaller than that of both outer ridges 51A. At the central position in the direction, a central ridge portion 51B is formed so as to project over the entire area in the vertical direction.
Therefore, the outer ridges 51A and the central ridges 51B of the decorative wall 51 form an outer groove 52 having an M-shaped cross-sectional shape that opens toward the outside of the building.

Of the wall base 50 of the air supply / exhaust type pilaster A2, the air passage forming recess 50A forming the ventilation passage 21 is a maximum opening slightly larger than the maximum opening width in the left-right direction of the outer groove portion 52, as shown in FIG. It is configured to have a width and an air passage depth slightly smaller than the depth dimension of the wall base 50.
Further, as shown in FIG. 4, the upper end surface 50a of the air passage forming recess 50A, which is the upper end of the ventilation passage 21, is slightly larger than the opening 55a of the second ceiling duct 55 arranged in the ceiling space 8. The lower end surface 50b of the air passage forming recess 50A, which is arranged above and is the lower end of the ventilation passage 21, is arranged slightly above the free access floor 4.

As shown in FIGS. 4 and 7, the air supply / exhaust type pilaster A2 is formed with a pair of air supply / exhaust slits 53 that communicate the left and right side portions of the ventilation passage 21 and the left and right side portions of the outer groove portion 52, respectively. Has been done. The outer opening 53b of the pair of slits 53 serves as an outside air introduction port, and the outside air is introduced into the building from the outer opening 53b of both slits 53 via the ventilation passage 21 and the second ceiling duct 55. It is configured to perform intake and exhaust.

As shown in FIG. 7, each of the slits 53 of the air supply / exhaust type pilaster A2 is formed in a tapered shape that becomes wider toward the ventilation path 21 side, and also suppresses rainwater intrusion from the slits 53. The structure 54 is provided. The rainwater intrusion suppression structure 54 is composed of the following three components.

(1) As shown in FIG. 7, the first component of the rainwater intrusion suppression structure 54 is formed by bending the outer passage portion 53a of each slit 53 to form the outer opening 53b of each slit 53. It is opened toward the inclined side surface 51b of the central ridge portion 51B on the base side of the inner inclined surface 51a of both outer ridge portions 51A. As a result, the intake / exhaust passage formed by the slit 53 is bent in the cross-sectional view, so that the intrusion of rainwater from the slit 53 is suppressed.

(2) As shown in FIG. 4, the second component of the rainwater intrusion suppression structure 54 is the opening 55a of the second ceiling duct 55 that opens the upper end surface 53e of each slit 53 to the upper part of the ventilation passage 21. By forming it at a position lower than that of the slit 53, the intrusion of rainwater from the slit 53 is suppressed.

(3) As shown in FIG. 7, the third component of the rainwater intrusion suppression structure 54 is an internal opening 53c of each slit 53 in the air passage forming recess 50A forming the ventilation passage 21 of the air supply / exhaust type pilaster A2. By attaching a perforated plate 57 such as aluminum punching for a bird net covering the above with bolts, the invasion of birds is prevented and at the same time the intrusion of rainwater from the slit 53 is suppressed.

Further, as shown in FIG. 7, the mounting piece 58 provided in the air passage forming recess 50A forming the ventilation passage 21 of the air supply / exhaust type pilaster A2 has excellent corrosion resistance for closing the indoor opening of the ventilation passage 21. A closing plate 59 made of gold-plated steel plate is attached, and a heat insulating layer 60 is formed by spraying urethane foam on site in a region extending between the closing plate 59 and the indoor end surface of the air supply / exhaust type pilaster A2.

As shown in FIG. 7, ingress rainwater is applied to the outer surface of the air supply / exhaust type pilaster A2 on both outer ridges 51A on the base side of the inner inclined surface 51a and at the location where the outer opening 53b of each slit 53 is formed. A rainwater stop groove 62 that guides the flow downward along the sill is formed as a depression.
By guiding the approaching rainwater down along the rainwater stop groove 62, dirt due to the drooping flow of the approaching rainwater can be concentrated, so that the aesthetic feeling of the air supply / exhaust type pilaster A2 can be maintained for a long period of time.

As shown in FIG. 7, the space between the left and right outer surfaces 50c of the wall base 50 of the air supply / exhaust type pilaster A2 and the vertical frame portion 71A of the frame material 71 of the glass curtain wall B is made of a silicone sponge constituting a wind barrier. A gasket 36 made of EPDM-S constituting the packing 35 and the rain barrier is provided.

Further, as shown in FIG. 7, on the end surface 71a on the building interior side of the vertical frame portion 71A of the frame material 71 of the glass curtain wall B, the ventilation passage of the blind box 37 side of the glass curtain wall B and the air supply / exhaust type pilaster A2. A vertical frame 38 for partitioning from the 21 side is attached. Among them, an internal space 64 that opens to the indoor side is formed between the vertical frame 38s located close to the left and right sides of the air supply / exhaust type pilaster A2. The decorative panel 40 that closes the indoor opening of the internal space 64 is detachably attached to the opening peripheral edges of both vertical frames 38 in a Kendon manner.

FIG. 8 shows two lightning protection structures of the pilaster A lightning protection measures arranged at the top of the building. The pilaster A used in this embodiment is composed of a wall base 80 capable of forming a ventilation passage 21 and a decorative wall 81 forming a pair of left and right outer ridges 81A.
Then, in the lightning protection structure shown in (a), a strip-shaped stainless steel lightning protection conductor 82 along the longitudinal direction of the pilaster A is provided at the tip end side portion of the outer inclined surface 81a in both outer protrusions 81A of the pilaster A. It is arranged flush with the outer inclined surface 81a, and a plurality of locations in the longitudinal direction of the lightning protection conductor 82 are fixed by anchor bolts 83. At least a part of the anchor bolt 83 is connected to the reinforcing bar 84 of the pilaster A by an electric conductor 85.
Further, although not shown, the lightning conductor 82 is formed with a tap hole for attaching a formwork.

Further, in the lightning protection structure shown in (b), a strip-shaped stainless steel lightning protection conductor 82 along the longitudinal direction of the pilaster A is tipped at the center position in the left-right direction of the tip surface 81b on both outer ridges 81A of the pilaster A. It is arranged flush with the surface 81b, and a plurality of locations in the longitudinal direction of the lightning protection conductor 82 are fixed by anchor bolts 83. At least a part of the anchor bolt 83 is connected to the reinforcing bar 84 of the pilaster A by an electric conductor 85.
Further, although not shown, the lightning conductor 82 is formed with a tap hole for attaching a formwork.

[Other Embodiments]
(1) In the above-mentioned first embodiment, the concrete first outer wall portion is composed of the precast concrete pilaster A, but the first outer wall portion is composed of the lightweight concrete curtain wall and the precast concrete curtain wall. Further, it may be composed of a concrete outer wall structure other than the curtain wall. In any of these cases, the concrete first outer wall portion is formed so as to project to the outer side of the building with respect to the other second outer wall portions.
Further, in the above-described first embodiment, the second outer wall portion is composed of a glass curtain wall, but the second outer wall portion is a metal curtain wall using a metal such as aluminum, or a wall structure other than the curtain wall. It may be composed of.

(2) In the above-described first embodiment, the extended ventilation passage 39 that opens to the indoor side in a state of communicating with the ventilation passage 21 of the duct type pilaster A1 between the vertical frame 38s located close to the left and right sides of the duct type pilaster A1. The cross-sectional shape of the integrated ventilation passage formed by the ventilation passage 21 and the extended ventilation passage 39 is formed in a convex shape, but the present invention is not limited to this configuration. For example, it may be configured only from the ventilation passage 21 of the pilaster A.

(3) In the above-described first embodiment, a duct type first outer wall portion (duct type pilaster A1) having the ventilation passage 21 as an indoor vertical duct, and an air supply / exhaust type that supplies and exhausts air between the ventilation passage 21 and the outside of the building. It is composed of a combination with the first outer wall portion (supply / exhaust type pilaster A2), but is not limited to this configuration. For example, it may be composed of only the duct type first outer wall portion (duct type pilaster A1), or conversely, it may be composed of only the air supply / exhaust type first outer wall portion (supply / exhaust type pilaster A2). good.

(4) In the first embodiment described above, the air supply / exhaust type pilaster A2 is formed with a pair of air supply / exhaust slits 53 for communicating the left and right side portions of the ventilation passage 21 and the left and right side portions of the outer groove portion 52, respectively. However, the number of slits 53 for air supply and exhaust may be one or three or more.

A 1st outer wall (pilaster)
A1 Duct type first outer wall (duct type pilaster)
A2 Air supply / exhaust type first outer wall (air supply / exhaust type pilaster)
B Second outer wall (glass curtain wall)
C Shutter mechanism 21 Ventilation path 53 Slit 54 Rainwater intrusion suppression structure

Claims (4)

It is the outer wall structure of the building that constitutes the outer wall of the building with precast concrete pilasters and curtain walls.
The pilaster is formed so as to project to the outside of the building from the curtain wall and has a U-shaped cross-sectional shape in which the inside is hollow, and the internal space of the pilaster is formed as a ventilation passage. The pilaster is provided with a duct type having the ventilation passage as an indoor vertical duct and an air supply / exhaust type for supplying and exhausting air between the ventilation passage and the outside of the building, and the duct type pilaster is attached to the curtain wall. The air supply / exhaust type pilaster is arranged at an adjacent indoor vertical duct construction site, and the air supply / exhaust type pilaster is an outer wall structure of a building arranged at an air supply / exhaust construction site adjacent to the curtain wall. The outer wall structure of the building according to claim 1, wherein the duct-type pilaster ventilation path is provided with a shutter mechanism for switching between a warm air ventilation state in which warm air is ventilated and a cold air ventilation state in which cold air is ventilated. The air supply / exhaust type pilaster is formed with a slit for air supply / exhaust that communicates the ventilation passage with the outside of the building, and is provided with a rainwater intrusion suppression structure that suppresses the intrusion of rainwater from the slit. Or the outer wall structure of the building described in 2. The outer wall structure of a building according to any one of claims 1 to 3 , wherein a lightning protection conductor is arranged on the outer surface of the pilaster, and the lightning protection conductor is connected to a reinforcing bar in the pilaster by an electric conductor.

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