Catch pan and curtain wall

Abstract

This product provides a catch pan that can reduce the number of pans used when constructing curtain walls, while also reducing the incidence of construction defects such as pressure variations and improper pressure application, and improving water leakage prevention performance. [Solution] The catch pan 22N comprises a catch pan body portion 22NA to which the abutting ends T of a plurality of panel units 10a having vertical frame portions 14 and horizontal frame portions 16 can come into contact; a flow channel 24N formed in the catch pan body portion 22NA that can receive rainwater that may flow along the vertical frame portions 14 and drain it to the outdoor side of the panel units 10a; and drainage holes 28N that communicate with the flow channel 24N and can discharge rainwater to the outdoor side. The drainage holes 28N are a pair, sandwiching the vertical frame portions 14, and open in the direction of extension of the horizontal frame portions 16. Catch pan.

Description

Technical Field

[0001] Embodiments of the present invention relate to a catch pan and a curtain wall.

Background Art

[0002] Curtain walls that make up the outer walls of buildings are widely used. A curtain wall is composed of a combination of a plurality of panel units. The panel units are finished at a factory or the like and transported to the construction site. Then, the individual panel units are arranged side by side in the vertical and horizontal directions while being attached to the building frame by fasteners (mounting brackets) to complete the outer wall. By the way, a water leakage prevention structure for preventing water from entering the inside of the building frame is required at the joint part of each panel unit that constitutes the curtain wall exposed to rain, and various structures have been proposed (for example, Patent Document 1). As a water leakage prevention structure, for example, a part called a catch pan that receives water that has entered from the joint part of the panel unit and discharges it to the outdoor side may be attached to the frame of the panel unit to prevent water leakage.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] As described above, in a water leak prevention structure using catch pans, catch pans are attached to the corners of the frame of each panel unit, and adjacent catch pans are compressed to ensure watertightness. However, because catch pans need to be attached to the corners of the frame of each panel unit, the number of catch pans used increases, and the construction work increases. Furthermore, as the number of catch pans used increases, the rate of construction defects due to variations in or insufficient pressure during installation increases.

[0005] The present invention has been made in view of the above, and one of its objectives is to provide a catch pan and a curtain wall using the catch pan that can reduce the number of points (units) used during construction, reduce the occurrence rate of construction defects such as pressure variations and poor pressure, and improve water leakage prevention performance. [Means for solving the problem]

[0006] To solve the above-mentioned problems and achieve the objective, the catch pan according to an embodiment of the present invention comprises a catch pan body portion to which the abutting ends of each of a plurality of panel units having vertical frame portions and horizontal frame portions can come into contact; a flow path formed in the catch pan body portion that can receive rainwater that may flow along the vertical frame portions and drain it to the outdoor side of the panel units; and drainage holes that communicate with the flow path and can discharge the rainwater to the outdoor side, wherein the drainage holes are arranged in pairs on either side of the vertical frame portions and open in the direction in which the horizontal frame portions extend.

[0007] Furthermore, a backflow prevention unit may be provided in a part of the flow path in this embodiment, for example.

[0008] Furthermore, the backflow prevention section of this embodiment may include, for example, a tapered section that narrows the width of the flow path communicating with the drain hole.

[0009] Furthermore, the tapered portion in this embodiment may be formed, for example, to narrow the vertical width of the flow path that communicates with the drain hole.

[0010] Furthermore, the tapered portion in this embodiment may include, for example, a stepped portion provided in the middle of the flow path and an upward sloping portion extending from the downstream side to the upstream side of the flow path, with the stepped portion in between.

[0011] Furthermore, the catch pan of this embodiment may also include, for example, a drainage section positioned below the drainage hole and having a downward sloping section that allows rainwater drained from the drainage hole to drain to the outside.

[0012] Furthermore, the curtain wall of this embodiment may also include, for example, the panel unit and the catch pan described above.

[0013] Furthermore, in the curtain wall of this embodiment, for example, the plurality of panel units may be arranged vertically, and configured so that rainwater discharged from the drainage holes flows down along the wall portion or horizontal frame flashing portion provided on the horizontal frame portion of the panel unit on the lower floor. [Effects of the Invention]

[0014] According to the configuration of the embodiment of the present invention, the catch pan body is configured as an integrated member that can come into contact with the abutting ends of a plurality of panel units having vertical and horizontal frame sections. Furthermore, rainwater that may flow along the vertical frame section of the panel unit is connected to a channel that drains to the outdoor side of the panel unit, and is drained through drainage holes that open in the extending direction of the horizontal frame section, in pairs on either side of the vertical frame section. As a result, the number of catch pans used throughout the curtain wall can be reduced, and by reducing the number of catch pans, construction man-hours can be reduced, and the occurrence rate of construction defects such as pressure variations and poor pressure can be reduced. [Brief explanation of the drawing]

[0015] [Figure 1] Figure 1 is an illustrative and schematic perspective view showing a building constructed using a catch pan according to this embodiment. [Figure 2]Figure 2 is an illustrative and schematic perspective view showing catch pans positioned to contact the abutting ends of the vertical and horizontal frame sections that constitute the panel unit of the curtain wall according to this embodiment. [Figure 3] Figure 3 is an illustrative and schematic perspective view showing the state in which the panel unit positioned above the catch pan has been removed from the state shown in Figure 2, completely exposing the top surface of the catch pan. [Figure 4] Figure 4 is an illustrative and schematic perspective view showing the rainwater discharge state in the catch pan of this embodiment. [Figure 5] Figure 5 is an exemplary and schematic perspective view showing other shapes of catch pans according to this embodiment. [Modes for carrying out the invention]

[0016] Illustrative embodiments of the present invention are disclosed below. The configurations of the embodiments shown below, as well as the actions, results, and effects brought about by such configurations, are examples only. The present invention can be realized by configurations other than those disclosed in the following embodiments, and it is possible to obtain at least one of the various effects based on the basic configuration or derived effects.

[0017] Figure 1 is an exemplary and schematic perspective view showing a building M constructed with a curtain wall 10 using the catch pan 22 (see Figure 2) according to this embodiment. As shown in Figure 1, the curtain wall 10 is an assembly of multiple panel units 10a that constitute the exterior wall of building M, and is constructed by arranging the panel units 10a in the vertical and horizontal directions of building M. The catch pan 22 is positioned in a state of being pressed against the abutting ends T, which are the corners of four adjacent panel units 10a. Each panel unit 10a is pre-finished in a factory and transported to the construction site. Each panel unit 10a is lifted by a crane or the like and fixed at a predetermined position on the building frame 12 that constitutes building M by fasteners (mounting brackets). The panel unit 10a is, for example, a roughly rectangular unit with a pair of vertical frames and a pair of horizontal frames, and board materials such as ordinary concrete, lightweight concrete, or metal are supported by the vertical and horizontal frames. The panel unit 10a can also support boards made of glass or the like.

[0018] In the following explanation, when viewing the exterior wall of building M from the outside, the direction to the right in the width direction will be referred to as the X1 direction, and the direction to the left in the width direction will be referred to as the X2 direction. Also, with respect to the exterior wall of building M, the direction toward the outside will be referred to as the Y1 direction, and the direction toward the inside will be referred to as the Y2 direction. Furthermore, the direction toward the upper floors of building M will be referred to as the Z1 direction, and the direction toward the lower floors will be referred to as the Z2 direction.

[0019] FIG. 2 is an exemplary and schematic perspective view showing a catch pan 22 disposed at a vertical frame portion 14, horizontal frame portions 16, 18, 20 of a panel unit 10a constituting the curtain wall 10 shown in FIG. 1, and at their butting end portions T. Specifically, the vertical frame portion 14 and the horizontal frame portion 16 constituting the panel unit 10a on the upper floor side, the horizontal frame portion 18 of the panel unit 10a on the lower floor side, and the horizontal frame portion 20 of the panel unit 10a on the lower floor side adjacent to the horizontal frame portion 18 are shown. And the catch pan 22 is disposed in a pressed state so as to contact the butting end portions T of the respective frame portions. In FIG. 2, the panel unit 10a (vertical frame portion and horizontal frame portion) on the upper floor side disposed adjacent to the vertical frame portion 14 in the X2 direction is not shown, and is shown so that the contact portion between the vertical frame portion 14 and the catch pan 22 can be seen. Further, FIG. 3 is an exemplary and schematic perspective view showing a state in which the panel unit 10a (vertical frame portion 14) on the upper floor side disposed on the upper surface of the catch pan 22 is further removed from the state shown in FIG. 2, and the upper surface side of the catch pan 22 is completely exposed.

[0020] As shown in FIG. 2, a plurality of ridge portions 14a extending in the Z1-Z2 direction are formed on a surface of the vertical frame portion 14 of the panel unit 10a facing the vertical frame portion of the adjacent panel unit 10a. On the other hand, a plurality of ridge portions are formed on the vertical frame portion of the panel unit 10a adjacent in the X2 direction (not shown) so as to fit into a space formed by the two ridge portions 14a of the vertical frame portion 14. By combining and connecting the ridge portions of the vertical frame portions of the adjacent panel units 10a, an arrangement for suppressing the intrusion of dust and dirt from the outdoor side to the indoor side of the panel unit 10a can be realized. In addition, on the horizontal frame portion 18 of the panel unit 10a and the horizontal frame portion 20 adjacent thereto, a wall portion 20b rising in the Z1 direction and extending in the X1-X2 direction is formed. By the wall portion 20b, the intrusion of dust and dirt from the outdoor side to the indoor side can be suppressed when the panel unit 10a is installed. Each panel unit 10a (such as the vertical frame portion 14 and the horizontal frame portions 16, 18, 20, etc.) is interconnected and fastened to the building body 12 by fastening members (such as bolts, etc., not shown) with the catch pan 22 interposed at the butting end portion T.

[0021] As shown in FIG. 3, the drip pan 22 is composed of a drip pan main body 22A, a flow path 24, a backflow prevention part 26, a drain hole 28, and a draining part 30.

[0022] The drip pan main body 22A is a substantially square block-shaped member having elasticity that can be arranged at a position where the butting ends T of the four panel units 10a arranged side by side in the vertical direction (Z1-Z2 direction) and the horizontal direction (X1-X2 direction) as described above contact. That is, the drip pan main body 22A is formed as an integrated single member so that the four adjacent panel units 10a can contact. The drip pan main body 22A can be composed of, for example, a silicon sponge manufactured by putting a foaming agent into a silicon material. Note that the material constituting the drip pan main body 22A is not limited to a silicon sponge, and can be appropriately changed as long as it has elasticity and is formed of a material having waterproofness, corrosion resistance, etc.

[0023] On the upper surface of the drip pan main body 22A, there are pressing parts P1 and P2 where the lower ends of the vertical frame parts 14 of the panel unit 10a abut to press the drip pan main body 22A, and pressing parts P3 and P4 where the lower ends of the vertical frame parts of the panel unit 10a adjacent to the X2 direction side (not shown in FIG. 2) abut to press the drip pan main body 22A. On the lower surface side of the drip pan 22, the wall part 20b of the horizontal frame part 20 of the lower floor side panel unit 10a and the wall part (not shown) of the horizontal frame part 18 abut. Therefore, the drip pan 22 is installed in a state of being sandwiched between the panel unit 10a on the upper floor side and the panel unit 10a on the lower floor side. By fixing to the housing 12 in a state where the panel unit 10a with the drip pan 22 interposed is pressed downward (Z2 direction), the pressing parts P1 to P4 of the drip pan main body 22A are crushed, and the adhesion between the drip pan 22 and each panel unit 10a can be easily ensured. Note that an elastic member (for example, a rubber member, etc.) may be attached to the lower end of the vertical frame part. In that case, the adhesion can be further improved by the elastic deformation of the drip pan main body 22A and the elastic deformation of the elastic member on the vertical frame part side.

[0024] Thus, the catch pan body 22A functions as a component that contacts the two upper-floor panel units 10a arranged in the X1-X2 direction on its upper surface. Furthermore, as shown in Figure 2, the catch pan body 22A functions as a component that contacts the two lower-floor panel units 10a arranged in the X1-X2 direction on its lower surface. In other words, the catch pan 22 functions as a single component that can be used in common for all four panel units 10a.

[0025] The channel 24 is formed as a recess on the upper surface of the catch pan body 22A. The channel 24 is a groove with a downward slope toward the outside (Y1 direction) when the catch pan 22 is installed. The channel 24 has the function of receiving rainwater that may flow down along the vertical frame surface 14b of the vertical frame portion 14 of the panel unit 10a and directing it toward the outside of the panel unit 10a along the channel 24.

[0026] The backflow prevention section 26 is formed in a part of the flow path 24. That is, the backflow prevention section 26 is formed, for example, on the indoor side (Y2 direction) of the drain hole 28, which communicates with the flow path 24 and opens to the outside to discharge rainwater to the outside. The backflow prevention section 26 has the function of suppressing rainwater hitting the outer wall side of the panel unit 10a from entering the flow path 24 from the outside, and preventing rainwater flowing in the flow path 24 toward the drain hole 28 from flowing back to the outside due to wind blowing from the outer wall side of the panel unit 10a. In this embodiment, an example is shown in which the backflow prevention section 26 is formed by a tapered section 26a that narrows the width of the flow path 24 communicating with the drain hole 28 in the X1 direction or X2 direction. Note that the backflow prevention section 26 is not limited to the tapered shape described above, and its shape can be changed as appropriate as long as it can suppress the backflow of rainwater.

[0027] As described above, the flow path 24 is equipped with a backflow prevention section 26 in the middle, and a drainage hole 28 is formed downstream thereof, which communicates with the flow path 24 and discharges rainwater to the outside. In this embodiment, as shown in Figure 3, the drainage hole 28 mainly comprises a drainage hole 28a that discharges rainwater received in the flow path 24 to the outside by flowing down along the vertical frame surface 14b of the vertical frame section 14 (panel unit 10a on the X1 direction side) shown in Figure 2, and a drainage hole 28b that mainly discharges rainwater received in the flow path 24 to the outside by flowing down along the vertical frame surface of the vertical frame section of the panel unit 10a on the X2 direction side (not shown in Figure 2). In the case of the catch pan 22 shown in Figure 3, the drainage holes 28 (drainage holes 28a, drainage holes 28b) are provided as a pair, flanking the vertical frame section 14, etc., and are positioned to open towards the outside. As a result, rainwater received in the flow path 24 can be smoothly discharged to the outside.

[0028] Furthermore, the flow path 24 formed in the catch pan body 22A is a common flow path that communicates with the drain holes 28a and 28b. Therefore, even if there is a difference between the amount of rainwater that flows down the vertical frame portion 14 of the panel unit 10a that presses the pressing portions P1 and P2 and the amount of rainwater that flows down the vertical frame portion of the panel unit 10a (not shown) that presses the pressing portions P3 and P4, the drain holes 28a and 28b complement each other's drainage, preventing the flow path 24 from overflowing with rainwater or accumulating in the flow path 24.

[0029] The water drain section 30 is positioned below the drainage holes 28 (drainage holes 28a, 28b) and has the function of absorbing the falling energy of rainwater drained from the drainage holes 28. The water drain section 30 is made of, for example, a hard rubber material and absorbs the falling energy and suppresses splashing compared to when rainwater discharged from the drainage holes 28 directly collides with the steel material constituting the horizontal frame section 18 or horizontal frame section 20. The water drain section 30 has a downward sloping section 30a on the outdoor side (Y1 direction). As a result, the rainwater, whose splashing is suppressed, flows to the outdoor side along the downward sloping section 30a (water drain section 30) and easily flows down along the panel unit 10a on the floor below.

[0030] The drainage section 30 is fixed, for example, to the outdoor side (Y1 direction side) end of the catch pan body 22A with adhesive. Note that the connection between the drainage section 30 and the catch pan body 22A is not limited to adhesive; other connection methods may be used, such as fixing with screws, or molding together when the catch pan body 22A is formed using two-color molding.

[0031] Furthermore, a protruding piece 32 extending in the direction of the lower floor (Z2 direction) is formed approximately in the center of the outdoor end of the drainage section 30. The protruding piece 32 can engage with the gap formed between the vertical frames of panel units 10a that are arranged adjacent to each other in the X1-X2 direction on the lower floor side (Z2 direction side). By engaging the protruding piece 32 with the gap formed by adjacent panel units 10a, it becomes possible to position the catch pan 22 (catch pan body 22A) with respect to the panel units 10a that have already been fixed to the structure 12. In other words, the upper floor panel units 10a are positioned relative to the positioned catch pan 22, thereby improving the positioning accuracy of the upper floor panel units 10a. As a result, it becomes possible to improve the pressing (crushing) accuracy of the catch pan body 22A due to the installation of the panel units 10a, suppress variations in pressing, and contribute to improved watertightness.

[0032] Furthermore, the water drainage section 30 is connected to the horizontal frame water drainage sections 18a and 20a formed on the horizontal frame sections (horizontal frame sections 18 and 20) of the panel unit 10a in the X1-X2 direction (the direction in which the horizontal frame sections extend). As a result, rainwater that flows down the surface of the upper-floor panel unit 10a (for example, the central part) and reaches the horizontal frame water drainage sections 18a and 20a can be directed to the outside (Y1 direction) using the water drainage section 30 and flow down to the vicinity of the connection area of ​​the adjacent panel unit 10a on the lower floor. In other words, it is possible to collect the rainwater flowing down from the upper-floor panel unit 10a and direct it to the lower floor, preventing it from flowing down the surface of the lower-floor panel unit 10a again. As a result, rainwater flowing down the curtain wall 10 can be made less noticeable.

[0033] In the case of the catch pan 22 shown in Figure 3, a recess 34 is formed between the drain holes 28a and 28b. The recess 34 has the function of receiving rainwater that has flowed down the vertical frame surface 14bt (see Figure 2) of the vertical frame portion 14 of the panel unit 10a, which is located on the upper surface of the catch pan 22, on the outdoor side of the flow path 24, and rainwater that has flowed down a similar portion of the panel unit 10a (not shown in Figure 2), and discharging it to the drainage portion 30. In this case, the bottom surface of the recess 34 may also have a downward slope toward the outdoor side (Y1 direction), similar to the drainage portion 30. As a result, the accumulation of rainwater in the recess 34 is suppressed, and rainwater can be smoothly drained to the floor below.

[0034] Figure 4 is an illustrative and schematic perspective view showing the discharge state of rainwater R in the catch pan 22 configured as described above.

[0035] As described above, rainwater R flowing down the vertical frame surface 14b of the vertical frame portion 14 of the panel unit 10a and the vertical frame surface 14Ab of the vertical frame portion 14A of the panel unit 10a adjacent to the vertical frame portion 14 is caught in the flow channel 24 of the catch pan 22. The rainwater R that flows into the flow channel 24 flows towards the outside (Y1 direction) through the backflow prevention section 26 and is discharged from the drain hole 28. When the rainwater R discharged from the drain hole 28 hits the drain section 30, its falling energy is absorbed and it does not bounce back significantly, but flows along the downward slope section 30a on the drain section 30 towards the outside (Y1 direction).

[0036] As described above, the catch pan 22 of this embodiment is configured as a single component that contacts the abutting ends T of the four panel units 10a arranged in a vertical (Z1-Z2 direction) and horizontal (X1-X2 direction) orientation. As a result, the number of catch pans 22 used when installing the panel units 10a can be reduced compared to the conventional case where a catch pan was attached to each panel unit 10a. Furthermore, by reducing the number of catch pans 22 used when installing the panel units 10a, it is possible to reduce the occurrence rate of construction errors (such as improper pressing) during installation (when assembling the panel units 10a). It is also possible to reduce the number of construction man-hours.

[0037] Therefore, even in the curtain wall 10 using the catch pan 22 of this embodiment, it is possible to reduce the occurrence rate of construction errors (such as improper pressing) during installation (when assembling the panel unit 10a) and reduce the number of construction man-hours. In other words, it is possible to improve the watertight performance of the curtain wall 10 and, consequently, improve the quality of the curtain wall 10.

[0038] Figure 5 is an exemplary and schematic perspective view showing another shape of catch pan 22N according to this embodiment. Compared to the catch pan 22 described above, the catch pan 22N has a narrower width in the X1-X2 direction and a different opening position for the drain hole 28N, but the basic configuration, function and method of use are substantially the same as the catch pan 22 shown in Figure 3, etc.

[0039] The catch pan 22N shown in Figure 5 is configured to be applicable when the width of the vertical frame portion 14 of the panel unit 10a in the X1-X2 direction is narrower than the width of the vertical frame portion 14 of the panel unit 10a to which the catch pan 22 is applied in the X1-X2 direction. In other words, the catch pan 22N is composed of a catch pan body portion 22NA, a flow path 24N, a backflow prevention portion 26N, a drain hole 28N, a drainage portion 30N, etc. Since the catch pan 22 and the catch pan 22N have substantially the same function, the symbol "N" is added to the reference numerals indicating each component of the catch pan 22N, and a detailed explanation is omitted.

[0040] When setting the width of the catch pan 22N in the X1-X2 direction to correspond to the narrow width of the vertical frame portion 14 in the X1-X2 direction of the panel unit 10a, it may be difficult to secure space to form two drainage holes 28 that open in the Y1 direction, similar to the catch pan 22. Also, while it is conceivable to reduce the opening width or the number of openings to one to correspond to the width of the catch pan 22N in the X1-X2 direction, this may lead to a decrease in drainage capacity. Therefore, in the case of the catch pan 22N, the drainage holes 28N (drainage holes 28Na, 28Nb) are provided in a pair, sandwiching the vertical frame portion located on the upper surface of the catch pan 22N, and are positioned to open along the extending direction (X1-X2 direction) of the horizontal frame portion of the panel unit 10a. In this way, by providing the drainage holes 28N on separate surfaces (surfaces facing the X1-X2 direction), two drainage holes 28N can be easily formed in relation to the flow path 24N. In this case, for example, rainwater discharged from the drain hole 28Nb flows down along the wall portion 20b of the horizontal frame portion 20 of the panel unit 10a on the lower floor side in a manner that suppresses splashing, and flows to the horizontal frame drain portion 20a of the horizontal frame portion 20. Then the rainwater flows to the drain portion 30N, flows to the outside side (Y1 direction), and is discharged to the lower floor side. Similarly, rainwater discharged from the drain hole 28Na flows to the outside side from the drain portion 30N and is discharged to the lower floor side.

[0041] In this way, by forming catch pans 22 and 22N according to the shape of the panel unit 10a, it is possible to reduce construction errors in the curtain wall 10, reduce construction man-hours, improve watertightness, and ultimately improve the quality of the curtain wall 10.

[0042] While embodiments and variations of the present invention have been described, these embodiments and variations are presented as examples only and are not intended to limit the scope of the invention. These novel embodiments can be implemented in a variety of other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their variations are included in the scope and spirit of the invention, as well as in the claims of the invention and its equivalents. [Explanation of symbols]

[0043] 10 Curtain Wall 10a Panel Unit 12 skeleton 14,14A Vertical frame section 16,18,20 Horizontal frame part 18a, 20a Horizontal frame drain section 22,22N Catch Pan 22A, 22NA Catch Pan Main Body 24,24N channel 26,26N Backflow prevention section 28, 28N drainage hole 30,30N drainage section 30a Downhill section M Building R Rainwater T Butt end

Claims

1. A catch pan body portion into which the butt ends of each of the multiple panel units having vertical and horizontal frame portions can come into contact, A channel is formed in the catch pan body that can receive rainwater that flows along the vertical frame and direct it to the outdoor side of the panel unit, A drainage hole that communicates with the aforementioned flow path and is capable of discharging the rainwater to the outdoor side, Equipped with, The drainage holes are arranged in pairs, flanking the vertical frame, and open in the direction of the extension of the horizontal frame. Catch pan.

2. A backflow prevention unit is provided in a part of the aforementioned flow path. The catch pan according to claim 1.

3. The backflow prevention section includes a tapered section that narrows the width of the flow path communicating with the drain hole. The catch pan according to claim 2.

4. The tapered portion is formed to narrow the vertical width of the flow path that communicates with the drain hole. The catch pan according to claim 3.

5. The tapered portion includes a stepped portion provided in the middle of the flow path and an upward sloping portion extending from the downstream side to the upstream side of the flow path, with the stepped portion in between. The catch pan according to claim 4.

6. The catch pan according to claim 1, further comprising a drainage section positioned below the drainage hole and having a downward sloping section for draining rainwater drained from the drainage hole to the outside.

7. The aforementioned panel unit, A catch pan according to any one of claims 1 to 6, A curtain wall equipped with this feature.

8. The aforementioned plurality of panel units are arranged vertically, and are configured such that rainwater discharged from the drainage holes flows down along the wall portion or horizontal frame drip edge portion provided on the horizontal frame portion of the panel unit on the lower floor. The curtain wall according to claim 7.

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