JPH0823186B2 - Curtain wall with entrance and exit corners - Google Patents

Description

TECHNICAL FIELD The present invention relates to a curtain wall having a projecting corner portion and an entering corner portion.

[Conventional technology]

A curtain wall in which a panel body such as glass is attached to a vertical direction is not known in which adjacent panel bodies are in a straight line, for example, a curtain wall having an exit corner portion and an entrance corner portion at 90 degrees.

For example, as shown in Japanese Unexamined Patent Publication No. 57-9943, a panel body is attached between a protruding corner upright and an entering corner upright mounted on a building frame, and is shown in Japanese Utility Model Laid-Open No. Sho 63-83308. As described in Japanese Utility Model Publication No. 58-6972, a panel body is attached to each of a pair of vertical panel attachment portions. Are known.

[Problems to be Solved by the Invention]

In the first type, since the cube and the panel body are separately attached to the building body, not only the installation work and the positioning work are very troublesome, but also the outer surface of the building body has a shape along the panel body, which is a straight line. It is not applicable in the case of the building frame of the shape.

In the second one, the pair of vertical panel mounting portions are at the same angle formed by the adjacent panel bodies, the pair of panel mounting portions are largely separated, and the left and right end portions of the adjacent panel bodies are also largely separated. Since the part without the panel body is large, the curtain part is remarkably conspicuous when viewed from the outside, resulting in a curtain wall.

In the third type, since the adjacent part on the opposite side of the vertical side where the panel body is attached is attached to the building frame side with a fastener, it is preferable as the entry corner part, but it is difficult to attach the vertical part in the case of the exit corner part. Will be.

Therefore, an object of the present invention is to provide a curtain wall having an entrance / exit corner portion that can solve the above-mentioned problems.

[Means and Actions for Solving the Problems]

A panel parallelepiped mounting portion having a substantially parallelepiped shape is formed by the recessed protrusions on the protruding corners and the recessed recesses on the recessed corners. ,
This is a curtain wall in which both ends of the panel body in the longitudinal direction are connected so as to face the projected recesses and the mounting recesses in the upright corners, which facilitates mounting and positioning, and both ends of the left and right panel bodies in the longitudinal direction. It was made possible to approach.

〔Example〕

(Outline of Curtain Wall) As shown in FIG. 2 and FIG. 3, the blind 3 is connected to the projecting corner upright 1 and the entering corner upright 2 which are attached to the building frame A by the connecting device B. A panel 5 such as a heat-reflecting glass is mounted on a frame 4 composed of the projected corner stand 1, the entered corner stand 2, and the upper and lower blinds 3, 3 and having the projected corner section 6 and the entered corner section 7. It constitutes a vertical curtain wall, which is a panel body consisting of upper and lower blinds 3, 3 and panel 5.

In the embodiment, the vertical bones 8 are connected between the upper and lower seamless parts 3 to divide the frame part 4 into two parts, and the panel 5 is attached to each frame part 4.

As shown in FIG. 4, the seamless space 3 is a space portion which is an intake and exhaust port formed by an upper seamless space 9 and a lower seamless space 10 and which is continuous in the longitudinal direction.
11 has a shape, a bird net 12 is provided on the outside of the space portion 11 outside the room, and a duct 13 is connected to the inside of the space 11, and a panel is provided above the lower blind 10 and below the upper blind 9. 5, the upper edge and the lower edge of the panel 5 are supported, and the left and right vertical edges of the panel 5 are supported on the protruding corner upright 1 and the entering corner upright 2 through the ridges 14 as shown in FIG. A refractory panel 15 is mounted on the outside of the lower blind 10 of the upper blind 3 and on the outside of the upper blind 9 of the lower blind 3, which is supported.

(Shape shape) As shown in FIG. 6, the projection corner stand 1 is composed of the indoor vertical plate 20, the one vertical plate 21, the other vertical plate 22 and the connecting vertical plate 23. A cross-sectional shape having an outer opening 25, one side and the other side vertical plates 21, 22 of which are hook-shaped pieces 26 that are continuous with the indoor vertical plate 20, projecting pieces 27 that are continuous with the hook-shaped pieces 26, and their protrusions. The piece 27 and the continuous support piece 28 have a shape having a mounting recess 29, and the mounting recess 29 has a substantially U-shape in which the indoor and outdoor opening ends 29b and 29c are inclined toward the indoor side with respect to the bottom 29a, The ridge 14 is engaged between the hook-shaped piece 26 and the protruding piece 27, and the ridge 14 and the support piece
The interior and exterior vertical sealing materials a, b with the glass 5 facing between
It is sealed with.

As shown in FIG. 6, the inside corner stand 2 has a cross section having an indoor side hollow portion 34 and an outdoor side opening portion 35 formed by an indoor vertical plate 30, one side vertical plate 31, an outer vertical plate 32, and a connecting vertical plate 33. It is a shape, one side and the other side vertical plate 31, 32 is a base protruding piece 36 continuous with the indoor vertical plate 30,
An L-shaped tip protruding piece continuous with the intermediate portion of the base protruding piece 36
37 and a supporting piece 38 continuous with the tip protruding piece 37 have a mounting recess 39, and the mounting recess 39 is an indoor / outdoor opening end.
39b and 39c are substantially U-shaped inclined toward the outdoor side with respect to the bottom portion 39a, and the tip portion of the base protruding piece 36 and the front protruding piece 37 are formed.
The ridge 14 is attached to the intermediate portion of the glass 5, the glass 5 faces between the ridge 14 and the support piece 38, and the indoor / outdoor vertical seal material c,
It is sealed with d.

The mounting recess 29 of the protruding corner upright 1 and the mounting recess 29 of the recessed upright corner 39
39 means that the bottom portions 29a, 39a are parallel to each other, the indoor opening end portions 29b, 39b are aligned in a straight line, and the outdoor opening end portions 29c, 39c are aligned in a straight line, so that a panel body mounting portion of a substantially parallelogram shape is formed. I am configuring.

(Shape of seamless 3) As shown in FIG. 7, the upper seamless 9 connects the upper part of the indoor vertical plate 40 and the upper part of the intermediate vertical plate 41 with the upper horizontal plate 42, and the upper and lower intermediate parts of the intermediate vertical plate 41 and the outdoor vertical plate. The upper part of the plate 43 is connected by the intermediate horizontal plate 44, and the upper and lower middle parts of the outdoor vertical plate 43, the lower part of the intermediate vertical plate 41, and the lower part of the indoor vertical plate 40 are connected by the lower horizontal plate 45, and the indoor hollow part 46 and the chamber are connected. Outer hollow part 47
It has a cross-sectional shape with a hook piece above and below the indoor vertical plate 40.
48 are provided integrally facing each other in the longitudinal direction and have mounting groove grooves 49 that open to the indoor side, and a ridge 50 having a hollow rectangular cross section is attached to the upper part of the outdoor vertical plate 43 so that it is on the outdoor side. The facing concave portion 51 is formed, and the lower edge of the panel 5 faces the outdoor facing upward concave portion 51 and is sealed with the indoor and outdoor lower horizontal sealing materials e and f.

The lower blind 10 connects the upper and lower middle and lower portions of the indoor vertical plate 52 and the upper and lower portions of the intermediate vertical plate 53 with the upper horizontal plate 54 and the lower horizontal plate 55, and the outdoor vertical plate 56 is provided at the outdoor end of the upper horizontal plate 54. Are integrally provided with a hollow portion 57 on the indoor side and a downward concave portion 58 on the outdoor side, and hook pieces 59 are integrally provided on the upper and lower sides of the indoor vertical plate 52 so as to face each other and are attached to the indoor side. There is a groove 60, and the upper edge of the panel 5 faces the outdoor-side downward recess 58 and is sealed by the indoor and outdoor upper horizontal sealing materials g and h.

(Vertical and seamless connection structure) As shown in FIG. 1, both longitudinal ends of the hook pieces 48, 59 of the seamless 3 are cut off, and both longitudinal ends of the outdoor vertical plates 43, 56 are hook-shaped. The notch portion 61 is machined so that both ends in the longitudinal direction of the seamless 3 are narrowed, and one end portion in the longitudinal direction is the mounting recess of the upright corner 1.
29, and one end face 3a in the longitudinal direction thereof is a recess of the mounting recess 29.
It is inclined to the right angle so as to be parallel to 29a, and one end in the longitudinal direction of the blind 3 is the indoor / outside surface, that is, the indoor vertical plates 40, 52.
And the notch 61 are parallel to the indoor and outdoor opening ends 29b and 29c of the mounting recess 29, and the longitudinal cover 62 is attached to the longitudinal end face 3a of the blind 3 and the notch 61 so that the longitudinal direction of the blind 3 is fixed. One end is closed, both ends in the longitudinal direction of the seamless 3 face the inside of the mounting recess 29 of the upright corner 1, and the other end face 3b in the longitudinal direction becomes parallel to the one end face 3a in the longitudinal direction. The other end surface 3b in the longitudinal direction is parallel to the bottom portion 39a of the mounting recess 39, and the other end portion in the longitudinal direction is the indoor / outer surface, that is, the indoor vertical plates 40, 52 and the notch 61.
Becomes parallel to the indoor and outdoor opening ends 39b, 39c of the mounting recess 39,
A vertical cover 62 is attached to the other end surface 3b in the longitudinal direction of the seamless member 3 and the notch 61 to close the other end portion in the longitudinal direction of the seamless member 3.

That is, the left and right end surfaces of the panel body are not right angles to the indoor and outdoor surfaces but are inclined, and the planar shape of the panel body is a substantially parallel four-sided shape.
It is arranged in a substantially parallelepiped panel body mounting portion composed of 39.

A protrusion 63 for inserting a screw is integrally provided on the vertical cover 62, and a screw fastening surface 63a of the protrusion 63 is perpendicular to the screw hole of the blind 3 to facilitate the screw fastening work.

Bolts 69 in which both side portions 68a of a pair of upper and lower connecting fittings 68 attached to the indoor vertical plate 20 of the raised corner stand 1 with bolts 67 are inserted into the mounting groove grooves 49, 60 of the upper seamless 9 and the lower seamless 10. And nut 7
It is connected with 0, and the connecting metal fitting 68 connects one end portion in the longitudinal direction of the upright corner stand 1 to the left and right upper unseal 9 and lower unseed 10.

A pair of upper and lower connecting fittings 72 respectively attached to the base protruding pieces 36, 36 of the one vertical plate 31 and the other vertical plate 32 of the above-mentioned entering corner stand 2 by the bolts 71 are mounting recesses for the upper and lower blinds 9, 10. Grooves 49,60
It is connected by a bolt 73 and a nut 74 which are inserted through the above. The connecting metal fitting 72 connects the other end in the longitudinal direction of the upright corner 2 and the left and right upper unseam 9 and the lower unseam 10.

As a result, the upper blind 9 and the lower blind 10 are connected to the projected corner stand 1 and the entered corner stand 2 at intervals in the vertical direction, and a space is provided between the upper blind 9 and the lower blind 10. It constitutes part 11.

(Details of Vertical Cover 62) As shown in FIG. 8, FIG. 9, and FIG. 10, the vertical cover 62 is attached over the upper unseam 9 and the lower unseam 10, and is provided with the indoor vertical plates 40, 52. A vertical plate 75 having the same width as the space between the outdoor vertical plates 43 and 56,
The vertical plate 75 is composed of an L-shaped one end vertical plate 76 which is continuous in the vertical direction at one end in the width direction, and another end vertical plate 77 which is continuous in the vertical middle at the other end in the width direction of the vertical plate 75. 75 is used to block the middle part between the upper and lower seamless parts 9 and 10, and one end plate 76 is used for the upper seamless part 9.
The projecting piece 40a projecting to the room side from the indoor vertical plate 40 and the projecting piece 52a projecting to the room side from the indoor vertical plate 52 of the lower seamless 10 are closed, and the notch portion 61 is formed by the other end vertical plate 77. Is closed, and a sealing material 77 is provided between the closing plate 78 and the other end plate 76 mounted over the projecting piece 40a and the projecting piece 52a.
The 10 inner parts are closed.

(Vertical and seamless joint seal structure) As shown in FIGS. 1 and 6, the vertical seal material i attached to the hook piece 26 of the vertical corner 1 is the ridge 14 and the interior vertical plate of the blind 3. 40,5
A vertical sealing material j is attached between the supporting piece 28 and the notch portion 61 of the blind 3 and the vertical sealing material j is continuous with the outdoor vertical sealing material b and the vertical length of the blind 3 is fixed. The sealing material K is mounted between the cover 62, that is, the one end surface in the longitudinal direction of the blind 3 and the mounting recess 29 of the projected corner upright 1, and the upper blind 9 as shown in FIG.
The space between the upper horizontal plate 42 and the ridge 14 is sealed with the sealing material l,
The space between the lower horizontal plate 55 of the lower blind 11 and the ridge 14 is sealed by the sealing material m, and the mounting recess 29 of the protruding corner 1 and the upper blind 9 of the upper blind 3 and the lower blind 3 are formed. Vertical space C between the upper eye
Respectively.

Since a seal is similarly provided between the corner 2 and the other end of the seamless 3 in the longitudinal direction, the same reference numerals are used and the description thereof is omitted.

(Equal pressure structure of seal part) As shown in FIG. 7 and FIG.
On the upper horizontal plate 42, a lower outside air introduction port 80 and an upper outside air introduction port 81 opened to the indoor side hollow portion 46 are formed, and the vertical space C above the sealing material K is communicated with the space portion 11 and its vertical space. C is isopressurized with the outside air, and the vertical plate 75 of the vertical cover 62 has an indoor hollow portion.
An outside air introduction port 82 opening at 46 is formed, and the vertical space C below the sealing material K is communicated with the space 11 so that the vertical space C is at the same pressure as the outside air.

As shown in FIG. 11, the upper outside air introduction port 81 has an upper horizontal plate 42.
A backup material 83 having a substantially U-shape is formed on the edge of the upper outer air introduction port 81 so as not to be blocked by the seal material when the seal material 1 is mounted.

(Drainage Structure of Seal Portion) As shown in FIGS. 7 and 11, the sealing material K has a step shape in which the indoor side portion is high and the outdoor side portion is low, and rainwater that has entered the vertical space C is transferred to the sealing material K. Along the outer side, it flows into the outdoor upward concave portion 51 of the upper blind 9, and flows into the outdoor hollow portion 47 through the upper drain hole 84 formed in the lower horizontal plate 44, and then into the lower horizontal plate 45.
The water is dropped from the lower water draining hole 85 formed in the above to the intake / exhaust port 11.

(Structure of the projected corner upright connection part) As shown in FIGS. 12 and 13, the upper end of the projected corner upright 1 has a stepped shape in which the inner side is higher and the outer side is lower, and a stepped shape is formed on the upper side of the inner side. It has 90, a vertical surface 91, and an outdoor lower surface upper surface 92.
The other side vertical plates 21, 22 are formed with vertical recesses 93 continuous with the vertical surface 91, and the vertical recesses 93 are flush with the inner surface of the connecting vertical plate 23.

The lower end of the projected corner upright 1 has a stepped shape in which the inside is high and the outside is low, and it has an indoor high lower surface 94, a vertical surface 95, and an outdoor lower lower surface 96, and the vertical surfaces 95 are connected. It is the inner surface of the vertical plate 23.

A joint sleeve is attached to the inner hollow part 24 of the projected corner 1
The lower half of 97 is fitted and the upper half is projected upward, and an irregular sealing material 98 is mounted between the outer peripheral surface of the joint sleeve 97 and the indoor hollow portion 24.
The upper half of 97 is fitted into the room-side hollow portion 24 of the upper projecting corner stand 1 so that the lower projecting corner stand 1 and the upper projecting corner stand 1 are separated from each other in the upper surface and the lower surface and have a vertical surface. 91, 95 are separated from each other and are connected to each other, and an indeterminate sealing material 99 is mounted over the upper surface 90 on the indoor side, the lower surface 94 on the indoor side, and the upper portion of the vertical surface 95, so that the upper and lower corners stand upright. A joint packing 100 is provided and sealed on the outdoor portion 1 and 1.

The joint packing 100 includes a vertical portion 101 having a vertical plate shape, and a pair of horizontal portions 102, 102 having a substantially A shape integrally provided at both ends of the vertical portion 101 in the width direction.
The one side / other side vertical plates 21 and 22 have a substantially U-shape that is in contact with the outer surface of the front end portion, and the upper and lower intermediate portions of the pair of horizontal portions 102 and 102 are thickened to become the support portion 103, and the vertical portion 101 horizontal portion 102 A plurality of water return pieces 104 are integrally provided above the support portion 103 on the inner side surface, and the support portion 103 of the pair of lateral portions 102, 102 is a corner stand 1
The vertical plates 21 and 22 on one side and the other side have substantially the same shape as the upper and lower end surfaces of the tip portion, and a pin hole 105 is formed at the tip portion.

The lower portion of the vertical portion 101 of the joint sleeve 100 is tightly fitted in the vertical concave portion 93 of the lower protruding corner 1 and the lower end surface 10
A space 106 is formed between 1a and the sealing material 98, and an upper portion of the vertical portion 101 is tightly fitted in a space 107 between the vertical surfaces 91 and 95 facing each other and is inserted into the pin hole 105 of the intermediate horizontal portion 102. Joint pin
108 is the pin hole 28 formed in the support piece 28 of the upper and lower projected corners 1,1
It is fitted to a.

As a result, the upper and lower projected corners 1 and 1 are connected by the joint sleeve 97, and the indoor portion connected by the joint sleeve 97 is reliably sealed by the seal members 98, 99, and the joint sleeve 97 is not provided. The joint packing 100 secures the portion near the outside of the room, and the rainwater that has infiltrated the connection part is the lower end surface 101a of the vertical portion of the joint packing 100.
Flows into the space 106 between the seal member 98 and the sealing material 98, flows down from the vertical recess 93 into the vertical space C, and is drained from the drain hole.

(Structure of the entrance corner upright connection part) As shown in Fig. 14 and Fig. 15, the upper end of the entrance corner upright 2 has a stepped shape in which the inside is high and the outside is low, and the upper surface of the inside high side. 110, a vertical surface 111, and an outdoor lower surface upper surface 112, and vertical recesses 113 continuous with the vertical surface 111 are formed on the one-side and the other-side vertical plates 31, 32. It is flush with the inner surface of the.

The lower end of the above-mentioned corner 2 has a stepped shape having a high indoor side and a low outdoor side, and has an indoor high lower surface 114, a vertical surface 115, and an outdoor lower lower surface 116, which vertical surfaces 115 are connected. It is the inner surface of the vertical plate 33.

A joint sleeve is attached to the inner hollow part 34 of the corner 2
The lower half of 117 is fitted and the upper half is projected upward, and an irregular sealing material 118 is mounted between the outer peripheral surface of this joint sleeve 117 and the indoor hollow portion 34, and the upper half of the join sleeve 117 is mounted. Is the inner hollow part 34 of the upper corner 2
Are fitted to each other, the lower entrance corner upright 2 and the upper entrance corner upright 2 are connected such that the upper surface and the lower surface are separated from each other and the vertical surfaces 111 and 115 are separated from each other. An indeterminate sealing material 119 is mounted over the lower surface 114 of the high part and the upper part of the vertical surface 115, and joint packings 120 are provided on the upper and lower corners of the vertical corners 2 and 2 close to the outside for sealing.

The joint packing 120 includes a vertical portion 121 having a vertical plate shape, and a pair of horizontal portions 122 and 122 having a substantially A shape integrally provided at both ends in the width direction of the vertical portion 121.
The one side and the other side vertical plates 31 and 32 have a substantially U-shape in contact with the outer surface of the front end portion, and the upper and lower intermediate portions of the pair of horizontal portions 122 are thickened to form a support portion 123, and the vertical portion 121 and the horizontal portion 122 thereof. A plurality of water return pieces 124 are integrally provided on the inner surface of the upper part of the support part 123, and the support parts 123 of the pair of lateral parts 122, 122 are the tips of the one side and the other side vertical plates 31, 32 of the entrance corner stand 2. The shape is substantially the same as the upper and lower end surfaces of the portion, and a pin hole 125 is formed at the tip portion thereof.

The lower portion of the vertical portion 121 of the joint packing 120 is tightly fitted in the vertical concave portion 113 of the lower corner 2 and the lower end surface 1
A space 126 is formed between 21a and the sealing material 118, and an upper portion of the vertical portion 121 is tightly fitted in a space 127 between the vertical surfaces 111 and 115 facing each other, and the joint pin 128 is inserted into the pin hole 125 of the support portion 123. Pin holes formed in the support pieces 38 of the upper and lower corners 2 and 3
It is fitted to 38a.

As a result, the upper and lower corners 2 and 2 are connected by the joint sleeve 117, and the inner part of the room connected by the joint sleeve 117 is reliably sealed by the sealing materials 118 and 119. The portion is securely sealed by the joint packing 120, and the rainwater that has entered the connecting portion flows into the space 126 between the lower end surface 121a of the vertical portion of the joint packing 120 and the seal material 118, and passes vertically through the rain trough 129 from the vertical recess 113. It flows down into the space C and is drained from the drain hole.

(Modification) In the above embodiments, the panel 5 is mounted between the upper and lower seamless parts 3 and 3 to form a panel body. However, the panel is mounted in a frame body in which the upper frame, the lower frame, and the left and right vertical frames are framed in a rectangular shape. Then, a unit type panel body may be provided, and the end faces of the left and right vertical frames may be slanted so as to be parallel.

〔The invention's effect〕

Connecting corner stand 1, entrance corner stand 2 and panel body
Since it is connected with, the installation and entry corner uprights 1 and 2 can be attached to the building frame side, which not only simplifies the installation work but also facilitates the positioning work of both, and is limited to the shape of the outer surface of the building body. It can be installed without a straight line.

The inner and outer open ends of the mounting recess 29 of the projected corner standing 1 and the mounting recess 39 of the entering corner standing 2 are inclined parallel to the bottom wall and face each other. In addition, since both end surfaces of the panel body are slanted and have a substantially parallel four-sided shape, the bottom portion 2 of the pair of mounting recesses 29, 39 in each cubic shape is formed.
9a and 39a can be made parallel and can be approached, and since the left and right ends of the adjacent panel bodies are close to each other, the part without the panel body is small and the cubic part is not very noticeable when viewed from the outside and looks good It becomes a curtain wall.

Since the inner corners of the projected corners and the raised corners 1 and 2 are attached to the building frame, the projected corners and the raised corners 1 and 2 can be easily attached to the building frame.

[Brief description of drawings]

The drawings show an embodiment of the present invention, in which FIG. 1 is a cross-sectional view of the entrance / exit corner upright and the seamless connection part, and FIGS. 2 and 3 are schematic front views and cross-sectional views of a vertical curtain wall. 4 and 5 are partially detailed vertical cross-sectional views, horizontal cross-sectional views, FIG. 6 is a horizontal cross-sectional view of the entrance / exit corner and the seal portion on the panel, and FIG. 8, FIG. 9, FIG. 10 and FIG. 10 are perspective views of one side and the other side of the vertical cover mounting portion, an exploded perspective view, FIG. 11 is a perspective view showing a drainage structure, FIG. 12 and FIG. Vertical cross-sectional view of the corner standing connection part,
FIG. 14 is an exploded perspective view, FIG. 14 and FIG. 15 are a longitudinal sectional view and an exploded perspective view of the vertical corner connecting portion. 1 is upright corner, 2 is inside corner upright, 29 is mounting recess, 29a is bottom, 29b and 29c are indoor / outdoor opening ends, 39 is mounting recess, 39a is bottom, 39b and 39c are indoor / outdoor opening ends Parts, 68 and 72 are connecting fittings.

Claims (1)

[Claims] 1. An entrance / exit corner part having a panel body attached thereto extending over an exit corner upright 1 having a pair of left and right attachment recesses 29, 29 and an entrance corner upright 2 having a pair of left and right attachment recesses 39, 39. In the curtain wall, the pair of left and right mounting recesses 29, 29 of the protruding corner upright 1 are tilted at an angle different from 90 degrees toward the bottom 29a and the entering corner upright 2 which are substantially parallel to each other. A pair of left and right mounting recesses 39, 39 of the inward corner stand 2 are formed in a substantially U shape with the opening end portions 29b, 29c.
Are inclined substantially different from each other at an angle different from 90 ° toward the bottom 39a and the projected corner upright 1 and the indoor and outdoor opening ends 39b, 39c.
The mounting recesses 29 and 39 facing each other form a substantially parallelogram-shaped panel body mounting portion, and the panel body is substantially parallel to each other with both longitudinal end faces of the panel body being diagonally parallel to each other. It has a quadrilateral shape, and one end in the longitudinal direction of the panel body is a mounting recess with a corner stand 1
29, and is connected by the connecting metal fitting 68, and the other end of the panel body in the longitudinal direction is made to face the mounting concave portion 39 of the corner 2 and the connecting metal fitting 72.
A curtain wall having an entrance / exit corner characterized by being connected by.