JP2022156807A - Building extension method - Google Patents

Abstract

To provide a building extension method excellent at workability with which the number of exterior wall panels to be removed can be reduced as much as possible when constructing an extension part below a girth in an existing building where the outer wall panels protrude in front of the girth located therebelow.SOLUTION: Provided is a building extension method for removing a part of an outer wall 110 of a multi-story existing building 100 and extending it. The existing building 100 has outer wall panels 40A, 40B on an upper floor and a lower floor, respectively. The outer wall panel 40A on the upper floor protrudes in front of a girth 10A between the upper and lower floors. When carrying out extension on the outdoor side of the lower floor of the existing building 100, there are a process A of exposing a part of the girth 10A by cutting the outer wall panels 40A at least halfway in a height of the girth 10A of the outer wall panel 40A on the upper floor and reinforcing a cut part 40a, and a process B of connecting a ceiling beam 90 to the exposed girth 10A so as to construct an extension part 200.SELECTED DRAWING: Figure 7

Description

The present invention relates to a building extension method.

When constructing an extension to an existing building, part of the outer wall of the existing building is removed to expose, for example, the dorsal span between floors. Furthermore, a method is applied in which the base of the extension is connected to the base of the existing building, and the exterior wall panels are attached to the ceiling beams and base.

For example, in an existing two-story building, if the outer wall panels are independent on each floor (when the outer wall panel on the second floor fits above the dorsal bridge between the first and second floors), for example, the outside of the outer wall on the first floor When constructing the extension part, it is enough to remove the outer wall panel on the first floor and expose the interstory between the first and second floors. On the other hand, in an existing building in which the outer wall panel is installed in such a manner that the outer wall panel extends to the front of the dorashi located below it, and the lower dorashi is completely hidden by the outer wall panel on the second floor, for example, As mentioned above, it is not possible to easily expose the torso. This will be explained with reference to FIGS. 1 to 4. FIG.

Fig. 1 is an external perspective view showing an example of the construction of an extension to an existing two-story building. FIG. 3 is a front view showing an example of an exterior wall panel mounting bracket attached to a wall panel, and FIG. 4, the outer wall panels shown in FIG. 3 are attached to the eaves girders and the girder shown in FIG. 2 as the outer wall panels of the second floor. It is a front view which shows the state attached as an outer wall panel.

FIG. 1 shows an example in which a part of the outer wall 110 of an existing two-story light steel frame building 100 is removed, and an extension section 200 having a cubic appearance is constructed. In the example shown in FIG. 2, the lower beam 10A is a girder between the first and second floors, the upper beam 10B is an eaves girder at the eaves, and both beams 10A and 10B are It is made of H-shaped steel. Each beam 10 is attached with two different kinds of external wall panel mounting metal fittings 20A and 20B.

The outer wall panel mounting bracket 20A attached above the upper flange 11 of the trunk holder 10A includes a fixed piece 21 fixed to the upper flange 11 of the trunk holder 10A with a bolt 28, and a fixing piece 21 perpendicular to the outer wall panel mounting bracket 20A. A contact piece 22 that contacts the panel frame 44 of the panel 40 is provided, and the contact piece 22 is provided with, for example, a plurality of (two in the illustrated example) guide engagement grooves 23 at intervals.

On the other hand, the eaves beam 10B and the outer wall panel mounting bracket 20B attached below the lower flange 12 of the girder 10A are fixed pieces 24 fixed to the lower flange 12 by bolts 28 and perpendicular to the fixed pieces 24. and a contact piece 25 that comes into contact with the panel frame 44 of the outer wall panel 40. The contact piece 25 has, for example, a plurality of bolt holes 27 (two in the illustrated example).

As shown in FIG. 3, the second-floor outer wall panel 40A has a rectangular panel frame 44 and an outer wall surface material 45 fixed to the panel frame 44 via a ventilation furring strip 44a. The panel frame 44 has a pair of left and right vertical beams 41 and a pair of upper and lower horizontal beams 42, and these members are formed by welding, nailing, screwing, or the like to each other. Here, the outer wall surface material 45 is formed of a ceramic siding material or the like having a plurality of vertical patterned joints 45a and horizontal patterned joints 45b on its surface. A total of four bolt holes 46 are formed near the upper two corners and the lower two corners of the panel frame 44. Fixing bolts 47 and 48 are installed in the respective bolt holes 46. are screwed together. In FIG. 3, two bolt holes 46 and fixing bolts 49 are indicated by dashed lines in the lower two corners, but the outer wall panel 40B on the first floor is, for example, above the panel frame 44. Fixing bolts 47 and 49 are screwed into a total of four bolt holes 46 in two corners and two lower corners.

As shown in FIG. 4, the outer wall panel 40A of the second floor has the lower fixing bolt 48 engaged with the guide engagement groove 23 of the outer wall panel mounting bracket 20A fixed to the lower trunk 10A, and the upper The upper bolt holes 46 are aligned with the bolt holes 27 of the exterior wall panel mounting brackets 20B fixed to the eaves girders 10B, and are bolted via the fixing bolts 47, thereby connecting the upper and lower eaves girders 10B. It is fixed to the trunk holder 10A. At this time, as shown in FIG. 4, the outer wall panel 40 is attached in such a manner that the outer wall panel 40 protrudes in front of the lower trunk 10A, and the outer wall panel 40 completely hides the trunk 10A. Further, the upper part of the outer wall panel 40B of the first floor is bolted to the outer wall panel mounting bracket 20B of the torso 10A below the outer wall panel 40A of the second floor with a fixing bolt 47, and the lower part of the outer wall panel 40B of the first floor is connected. are bolted with fixing bolts to an exterior wall panel mounting bracket attached to a base (not shown).

In an existing building 100 having exterior wall panels 40B and 40A on the first floor and the second floor, respectively, shown in FIG. When constructing the extension part while connecting the ceiling beams of the illustrated extension part to the dorashi 10A, as is clear from FIG. The trunk 10A cannot be exposed only by removing the outer wall panel 40B on the first floor, and the extension section cannot be constructed on the first floor unless the outer wall panel 40A on the second floor is removed. If the existing building 100 is a two-story building as shown in the figure, it will be necessary to remove eaves and the like (not shown) in order to remove the second-floor outer wall panel 40A, and there will be more outer wall panels and members to be removed. Become. In the illustrated example, the outer wall panel 40A on the second floor protrudes to the front surface of the torso 10A located below. The form of projecting to the front surface of the torsion 10A includes a form of projecting to the middle of the front surface of the torsion 10A (thus, a form in which the lower part of the torsion 10A is exposed), and a form of extending beyond the lower end of the torsion 10A and further downward. Various forms may be included, such as a form in which the outer wall panel 40A protrudes.

From the above, in an existing building in which the outer wall panels protrude in front of the dozashi below, when constructing an extension part below the dozashi (for example, the first floor), it is necessary to remove the outer wall panels and members to be removed. There is a demand for a building extension method that can reduce the number of buildings as much as possible and has excellent workability.

Here, Patent Literature 1 proposes a building in which an extension section (here, an extension section) is attached to an existing building (here, an existing section). Specifically, it is a building in which a second building has been added to the side of the existing first building, making it structurally independent. The second building is a rigid-frame structure consisting of columns and beams. By having a building unit and transmitting force from the side of the first building to the side of the second building when the first building rolls, the horizontal shaking of the first building with respect to the second building is restricted. One end of the regulating member is fixed to the unit skeleton of the second building, and the other end of the regulating member extends toward the first building.

Japanese Unexamined Patent Application Publication No. 2012-237130

Although the building described in Patent Document 1 is a building in which an extension part is attached to an existing building, as described above, the existing building has a form in which the outer wall panel on the second floor protrudes in front of the dorsashi located below it. Since it does not disclose how to extend the building, it is possible to reduce the number of exterior wall panels and members to be removed as much as possible when constructing the extension part below the dorsal in such an existing building, and to improve workability. It is not intended to propose a superior building extension method.

The present invention has been made in view of the above problems. It is an object of the present invention to provide a building extension method which can reduce the number of panels and members as much as possible and is excellent in workability.

In order to achieve the above object, one aspect of the building extension method according to the present invention is
A building extension method of removing a part of the outer wall of an existing multi-story building to extend the building,
The existing building is provided with outer wall panels on the upper floor and the lower floor, and the outer wall panel on the upper floor protrudes in front of the girdle between the upper floor and the lower floor,
When expanding the existing building to the outdoor side of the lower floor, the outer wall panel of the upper floor is cut at least at the middle level of the girth of the girth to expose a part of the girth. Reinforcing the A step,
and a step B of connecting ceiling beams of an extension section to the exposed trunks to construct the extension section.

According to this aspect, when the outer wall panel of the upper floor is extended to the outside of the lower floor of the existing building that protrudes in front of the dorashi between the upper floor and the lower floor, the dorashi in the outer wall panel of the upper floor Cut the outer wall panel at least at the middle of the height to expose a part of the trunk, reinforce the cut part, connect the ceiling beam of the extension part to the exposed trunk and construct the extension part As a result, the outer wall panels to be removed can be only the outer wall panels of the lower floor (for example, the first floor), so the number of outer wall panels to be removed can be reduced as much as possible, resulting in excellent workability. It is a method of building extension. In this aspect, in addition to cutting the outer wall panel of the upper floor at least at the middle of the height of the trunk, the cut portion of the outer wall panel is reinforced, so that the outer wall panel of the upper floor is cut at the middle position. However, it is possible to prevent the cut portion from becoming a structurally weak portion of the outer wall panel. Here, "at least the midway height level of the trunk" means the height of the trunk, such as the lower end level of the upper flange of the trunk made of H-shaped steel, the height slightly lower than the upper flange, etc. In addition to any intermediate level, it is meant to include a height level higher than the upper end of the trunk (for example, the upper end of the upper flange of H-section steel).

In another aspect of the building extension method according to the present invention,
The outer wall panel includes at least an outer wall surface material, a panel frame, and a heat insulating material,
It is characterized in that, in the step A, reinforcing horizontal beams are screw-connected to the lower portions of the left and right vertical beams constituting the cut panel frame.

According to this aspect, the cut portions of the main structure of the outer wall panel can be effectively reinforced by screw-connecting the reinforcing horizontal beams at the cut portions of the left and right vertical bars of the panel frame that constitutes the outer wall panel. can. Here, "at least comprising an exterior wall surface material, a panel frame, and a heat insulating material" means that the exterior wall panel includes, in addition to the exterior wall surface material, the panel frame, and the heat insulating material, a space between the exterior wall surface material and the panel frame. In addition, it means that it is provided with a ventilating collar or the like, for example made of polystyrene. The outer wall material is formed of, for example, a siding material, and the siding material includes ceramic siding, metal siding made of aluminum or steel plate, woody siding made of processed natural wood, resin-based siding made of vinyl chloride resin, etc. Siding etc. are mentioned.

For example, welding should not be applied to the left and right vertical bars of a panel frame made of light iron channel steel by fitting reinforcing horizontal bars made of light iron channel steel from below and connecting them with screws. Therefore, it is possible to carry out construction without fire risk while residents live in the existing building. Here, screws for screw connection include screws, nails, bolts, etc., in addition to literal screws.

In another aspect of the building extension method according to the present invention,
The outer wall panel has a width that is an integral multiple of the module width,
The ceiling beam is connected to a position that is set back by a predetermined width from a position that is an integral multiple of the module width.

According to this aspect, the extension section is constructed on the first floor, for example, by connecting the ceiling beam to the position set back by a predetermined width from the position of the integral multiple of the module width of the outer wall panel in the exposed dorsal. It suffices to remove only the outer wall panel in the area where it is located, making it unnecessary to remove the outer wall panel on the side.

The module width (1P) is a width that can be arbitrarily set according to module design specifications, such as 1P being set to 910 mm between 800 mm and 1100 mm. Normally, columns and studs are erected at the module core position, and external wall panels having a width (1P width, 2P width, etc.) that is an integral multiple (1 time, 2 times, etc.) of the module width are attached to these. When the ceiling beam is installed at a position that is an integral multiple of the module width (in other words, it is the module core position, and this integral multiple includes 0 times), the exterior wall panel adjacent to the construction area of the extension section Since it interferes with the installation of the beam, the removal of this adjacent siding panel is unavoidable, increasing the number of siding panels to be removed.

Therefore, in this aspect, the ceiling beams of the extension part are positioned closer to the position of the integral multiples of the module width (at the module core position, the position of 0 times, the position of 1 time, the position of 2 times, etc.) By installing it at a position that is set back by a predetermined width (a position that is set back inside the construction area of the extension section), it is possible to eliminate the need to remove the exterior wall panels adjacent to the construction area of the extension section. Together with the cutting of the panel at the midway position, it becomes possible to further reduce the number of exterior wall panels to be removed. For example, if 1P is set to 910 mm and the width of the outer wall panel is set to 1P width or 2P width, 227.5 mm, which is 1/4 of 1P, can be set as the predetermined setback width. .

In another aspect of the building extension method according to the present invention,
When one side surface of the extension part is located near an external corner of the existing building, a position inside from the end of the external corner in the trunk while leaving the corner cover at the external corner characterized in that the ceiling beam is connected to the

According to this aspect, when one side surface of the extension part is located near the outside corner of the existing building, the module at the end of the outside corner is left in the trunk while leaving the corner cover at the outside corner. By attaching the ceiling beams to the position set back inward from the core, the extension part can be constructed near the outside corner of the existing building without removing the corner cover. For example, there is a form in which the ceiling beam at the end of the extension is attached to a position set back inward by a predetermined width such as the P/4 width described above from the column core (module core) of the column at the outside corner.

Another aspect of the building extension method according to the present invention is
It is characterized in that, in the step B, connecting metal fittings are bolt-connected to the exposed beams, and the ceiling beams are bolt-connected to the connecting metal fittings.

According to this aspect, by bolt-connecting the connection hardware to the exposed girder and bolting the ceiling beam to the connection hardware, welding is unnecessary, and the extension part is attached to the girth of the existing building. ceiling beams can be installed efficiently. For example, by applying one-side bolts that can be bolted only from the outside, it is possible to construct an extension part while residents live in the existing building while eliminating the risk of fire without welding.

In another aspect of the building extension method according to the present invention,
The step A is characterized in that a drainage steel plate for draining rainwater from the inside of the exterior wall panel to the outside is installed at the cutting location.

According to this aspect, by installing, for example, a drainage steel plate leading to the outside from the ventilation layer at the cut location of the outer wall panel, the outer wall panel of the upper floor of the existing building to the roof of the extension constructed below it. A drainage path can be formed. Here, the roof of the extension is constructed as, for example, a flat roof or a balcony.

As can be understood from the above description, according to the building extension method of the present invention, in an existing building in which the outer wall panels protrude in front of the dorashiri located below, the extension section is constructed below the dorashiri. In this case, the number of exterior wall panels to be removed can be reduced as much as possible, and the extension section can be constructed with excellent workability.

FIG. 4 is an external perspective view showing a state in which an example of an extension section has been constructed on an existing building; 1 is a front view showing an example of two upper and lower beams (eaves girder and girder) and exterior wall panel mounting brackets attached to each beam in an existing building. FIG. It is the perspective view which looked at an example of the outer wall panel from the back diagonal direction. The outer wall panel shown in FIG. 3 is attached to the eaves girders and torsion shown in FIG. It is a front view which shows the state which is. It is process drawing explaining an example of the extension method of the building which concerns on embodiment. FIG. 5 is a process diagram illustrating an example of the building extension method according to the embodiment, subsequent to FIG. 5 ; FIG. 7 is a process diagram illustrating an example of a method for expanding a building according to the embodiment, following FIG. 6 ; FIG. 7 is a process diagram illustrating an example of a method for expanding a building according to the embodiment, following FIG. 7 ; 9 is an arrow view in the IX direction of FIG. 8. FIG. FIG. 9 is a process chart illustrating an example of the method for expanding the building according to the embodiment, subsequent to FIG. 8 ; It is an enlarged view of the connection hardware attached to the beam. FIG. 10 is a process chart illustrating an example of the building extension method according to the embodiment, subsequent to FIG. 10 ; FIG. 12 together with FIG. 12 is a process diagram subsequent to FIG. 10 for explaining an example of the building extension method according to the embodiment;

An example of a building extension method according to an embodiment will be described below with reference to the accompanying drawings. In addition, in the present specification and drawings, substantially the same components may be denoted by the same reference numerals, thereby omitting duplicate descriptions.

[Building extension method according to the embodiment]
An example of the building extension method according to the embodiment will be described with reference to FIGS. 5 to 13 . Here, FIGS. 5 to 8, 10, 12 and 13 are process diagrams sequentially explaining an example of the building extension method according to the embodiment.

As already explained with reference to FIGS. 1 to 4, part of the outer wall 110 of the first floor (an example of the lower floor) and the second floor (an example of the upper floor) of the existing two-story light steel frame building 100 will be removed and the extension part 200 will be constructed as an example. That is, in the existing building 100, the outer wall panels 40B and 40A on the first and second floors are attached in the form shown in FIG.

In the example shown in FIG. 1 , an extension section 200 is constructed near one corner (outer corner) on the first floor of the existing building 100 . As shown in FIG. 5, at one corner of the existing building 100, a corner cover 50 having an L-shaped cross section orthogonal to the longitudinal direction is installed on the outdoor side of the pillar 80A (see FIG. 12) via a heat insulating material. installed.

Returning to FIG. 5, the vertical joint 32 between the corner cover 50 and the side wall panels 40A and 40B is aligned with the module core L1. (Here, P is set to 910 mm.) Exterior wall panels 40A and 40B are arranged vertically and horizontally. That is, the outer wall panel 40 has a width that is an integral multiple of the module width. Therefore, the module core L1, the vertical joint 32 on the 1P side (left side in FIG. 5) from the module core L1, and the separate vertical joint 32 on the 1P side (left side in FIG. 5) are also the module cores at the corner ends. It is positioned at an integer multiple from L1 (the module core L1 is also at a position that is 0 times included in the integer from the module core L1).

The lower end of the outer wall panel 40A on the second floor protrudes from the front surface of the outer wall panel 40A to the lower end of the outer wall panel 10A. is formed.

The extension part 200 shall be constructed within the range of width 2P from the corner cover 50 shown in FIG. In addition, the construction range of the extension part 200 may be set to a range of width 3P or more from the corner cover 50 . In the extension method of the illustrated example, first, as shown in FIG. 6, the outer wall panel 40B on the first floor within the range of width 2P is removed, and the middle height level (H The outer wall panel 40A is cut at the lower end of the upper flange of the shaped steel to expose a part of the trunk holder 10A.

As already described with reference to FIG. 3, the outer wall panel 40A is formed by attaching the outer wall surface material 45 to the outside of the panel frame 44 via the ventilation furring strip 44a. More specifically, as shown in FIG. 12 and the like, an outer heat insulating material 58 such as a glass wool board is attached between the ventilation furring 44a and the panel frame 44, and the inside of the panel frame 44 is made of glass wool or the like. A heat insulating material 56 is filled.

Returning to FIG. 6, of the outer wall panel 40A of the second floor, the vertical beam 41 forming the panel frame 44 is positioned below the engaging portion of the outer wall panel mounting bracket 20A above the trunk 10A (upper flange of the trunk 10A). ), and the outer wall surface material 45 is cut above the cut lower end of the vertical beam 41 so that the lower part of the vertical beam 41 is exposed, so that the cut point of the outer wall panel 40A is above the girder 10A. Form 40a.

In addition, in the conventional extension method, when constructing an extension section at one corner, the corner cover is also removed, and construction is generally performed using the module core L1 as the beam core of the ceiling beam of the extension section. However, in the extension method of the illustrated example, the corner cover 50 is left because the extension can be constructed without removing the corner cover 50 .

At the cutting point 40a, the horizontal beam 42 (see FIG. 3) below the panel frame 44 is removed, so the rigidity of the panel frame is reduced. First, as shown in FIG. 7, the reinforcing horizontal beams 60 are inserted into the left and right vertical beams 41, and fixed to the vertical beams 41 with drill screws 60b to reinforce the panel frame 44, as shown in FIG.

The reinforcing horizontal beams 60 are made of channel steel or the like like the vertical beams 41 of the panel frame 44, and as shown in FIG. The mounting piece 60a and the inner surface of the web of the vertical beam 41 are brought into contact with each other with the opening of the vertical beam 41 facing downward, and fixed via the drill screw 60b.

After the lower portion of the panel frame 44 is reinforced by the reinforcing horizontal beams 60, the underlying horizontal beams 61 and 62 are spaced apart from each other with respect to the exposed surface of the vertical beams 41 of the panel frame 44, as shown in FIG. screw 63. Then, as shown in FIG. 9, from the back surface of the foundation horizontal beam 61 below the ventilation furring strip 44a at the cut portion 40a of the outer wall panel 40A, the drainage is substantially Z-shaped in side view over the exposed surface of the underlying horizontal beam 62. A steel plate 65 is attached.

The drainage steel plate 65 allows the rainwater flowing down the ventilation layer 44b formed by the ventilation furring strip 44a of the outer wall panel 40A in the X1 direction to be drained through the X2 direction drainage path along the outer surface of the drainage steel plate 65. Become. Under the drainage steel plate 65, the roof of the extension part 200 shown in FIG. 1 is arranged, and this roof is constructed as a flat roof or a balcony as shown in the illustrated example.

After the drainage steel plate 65 is attached, a piece-shaped exterior wall surface member 45' is attached in the Y1 direction as shown in FIG. In addition, FIG. 9 shows a panel frame 55 for the inner wall on the indoor side of the outer wall panel 40A, a filled heat insulating material 56, a gypsum board 57 fixed to the indoor side surface of the panel frame 55, and the floor material of the second floor. 59 etc. are illustrated.

Next, as shown in FIG. 10, a connecting metal fitting 70 for attaching a ceiling beam 90 (see FIGS. 12 and 13) of the extended section is attached to the side surface of the web 13 of the trunk holder 10A by means of a one-side bolt 75. fixed.

As shown in an enlarged view in FIG. 11 , the connecting metal fitting 70 is a steel hat-shaped piece having a U-shaped piece 71 and left and right side pieces 72 extending laterally from both ends of the U-shaped piece 71 . is hardware. A bolt hole (not shown) formed in the web 13 is aligned with a bolt hole (not shown) formed in the side piece 72, and a one-side bolt 75 is screwed into both bolt holes. .

A plurality of (six in the illustrated example) bolt holes 73 are formed in the U-shaped piece 71 . As shown in FIG. 12, the ceiling beam 90 of the extension is made of H-section steel, and an end plate 91 is attached to the end of the H-section steel. A fastening nut 76 is preliminarily fixed to the rear surface of each bolt hole 73 of the U-shaped piece 71 , and the end plate 91 is brought into contact with the U-shaped piece 71 . By aligning the hole with the bolt hole 73 of the U-shaped piece 71 and screwing the bolt 77, the ceiling beam 90 of the extended section is connected to the trunk insert 10A via the connecting hardware 70. As shown in FIG.

Connecting the connecting hardware 70 to the trunk 10A with a one-side bolt 75; In the construction method shown in the figure, for example, the cross beam 60 is fixed by a drill screw 60b, welding is not required for connecting the members. As a result, while residents live in the existing building 100, construction of the extension section 200 without risk of fire becomes possible.

Returning to FIG. 10, the attachment position of one (right side in FIG. 10) connection fitting 70 to the trunk holder 10A is from the module core L1 on the side of the corner cover 50 to P/4 (1P is the module width, here 910 mm). This is the setback position (L3 position), and the mounting position of the other (left side in FIG. 10) connection fitting 70 with respect to the trunk holder 10A is two times the module width (2P ) is set back by P/4 from the module core L4 (position L6). 12 shows the relationship between the module core L1 and the setback position L3 in plan view, and FIG. 13 shows the relationship between the module core L4 and the setback position L6 in plan view.

Returning to FIG. 10, the mounting positions of the ceiling beams 90 in the extended section are set back by a predetermined width from the module cores L1 and L4, respectively, so that the corner cover 50 can be left, and furthermore, the module core L4 can be installed. Removal of the left outer wall panels 40A and 40B can be made unnecessary.

As already explained, in the A process, the outer wall panel 40A of the second floor is cut at a midway height level of the girder 10A in the outer wall panel 40A of the second floor to expose a part of the girder 10A, whereby the outer wall panel 40A of the second floor is cut. It is possible to eliminate the need for removal and removal of eaves and the like. In addition to this, by setting the mounting position of the ceiling beam 90 of the extension part within the construction range of the extension part set back by a predetermined width from the core of the module, it is possible to remove the corner cover 50 and to remove the side of the extension part 200. Removal of the outer wall panel 40 can be further eliminated. For these reasons, it is possible to suppress the expansion of the construction range when constructing the extension section 200, and the extension method is excellent in workability.

As shown in FIGS. 12 and 13, the pillars 80C of the extension section 200 are erected at the positions L3 and L6 set back from the module cores L1 and L4, and the ceiling beams are attached to the connection fittings 70 attached to the trunk insert 10A. 90 is bolted and bridged over the connection hardware 70 and the column 80C.

As shown in FIG. 12 , by setting back the extension part 200 from the corner cover 50 by P/4, the edge of the extension part 200 on the corner cover side forms an internal corner, but the edge of the extension part 200 on the side of the corner cover 50 forms an internal corner. Then, the outer wall panel 40C of the extended portion is attached so that one end of the outer wall panel 40C is brought into contact with the surface of the piece-shaped outer wall panel 45''. At this time, at the interface between the external wall panel 40C of the extension and the piece-shaped external wall surface material 45'', an L-shaped drainage steel plate 66 and a water stop material 67 preset thereon are interposed to form an internal corner. Form a water stop structure in the part.

On the other hand, as shown in FIG. 13, the end of the extension section 200 on the side opposite to the corner cover also forms an internal corner. Install so that it abuts against the At this time, a flat plate-shaped drainage steel plate 68 and a water stop material 69 preset thereon are interposed at the interface between the exterior wall panel 40C of the extension section and the exterior wall panel 40B of the existing building 100, thereby Forms a waterproof structure.

In addition, FIG. 12 shows a state in which a pillar 80B (stud) is located at a position from the module core L1 to 1P, and a panel frame 55 for an inner wall and a gypsum board 57 are attached to the interior side of each of the pillars 80A and 80B. It is 12 and 13, an inner wall panel frame (not shown) is attached below the ceiling beam 90, and the gypsum board 57 is attached to the panel frame. Although illustration is omitted, the exterior wall panels of the extension section extending over each pillar 80C shown in FIGS. Build (above, B step).

It should be noted that other embodiments may be possible in which other components are combined with the configurations described in the above embodiments, and the present invention is not limited to the configurations shown here. Regarding this point, it is possible to change without departing from the gist of the present invention, and it can be determined appropriately according to the application form.

10A: Beam (strut)
10B: Beam (eaves girder)
11: Upper flange 12: Lower flange 13: Web 20A, 20B: Outer wall panel mounting bracket 21, 24: Fixed piece 22, 25: Contact piece 23, 26: Guide engagement groove 27: Bolt hole 28: Bolt 32: Vertical Joint 34: Horizontal joint 40: Exterior wall panel 40A: Second floor exterior wall panel 40B: First floor exterior wall panel 40C: Extension wall panel 40a: Cutting location 41: Vertical beam 42: Horizontal beam 44: Panel frame 44a: Ventilation furring 44b: ventilation layer 45: outer wall surface material 45': piece-shaped outer wall surface material 45": piece-shaped outer wall surface material 45a: vertical joint 45b: horizontal joint 46: bolt hole 47, 48, 49: fixing bolt 50: corner cover 55: Panel frame 56: Heat insulating material 57: Gypsum board 58: Exterior heat insulating material 59: Flooring material 60: Reinforcing horizontal beam 60a: Mounting piece 60b: Screw 61, 62: Foundation horizontal beam 63: Screw 65: Drainage steel plate 66 , 68: Drainage steel plate 67, 69: Water stop material 70: Connection hardware 71: U-shaped piece 72: Side piece 73: Bolt hole 75: Bolt (one side bolt)
76: Fastening nut 77: Bolt 80A, 80B, 80C: Column 90: Ceiling beam 91: End plate 100: Existing building 110: Exterior wall 200: Extension

Claims (6)

A building extension method of removing a part of the outer wall of an existing multi-story building to extend the building,
The existing building is provided with outer wall panels on the upper floor and the lower floor, and the outer wall panel on the upper floor protrudes in front of the girdle between the upper floor and the lower floor,
When expanding the existing building to the outdoor side of the lower floor, the outer wall panel of the upper floor is cut at least at the middle level of the girth of the girth to expose a part of the girth. Reinforcing the A step,
A method for extending a building, characterized by comprising a step B of constructing the extension by connecting ceiling beams of the extension to the exposed torso. The outer wall panel includes at least an outer wall surface material, a panel frame, and a heat insulating material,
2. The building extension method according to claim 1, wherein, in said step A, reinforcing horizontal beams are screw-connected to the lower portions of left and right vertical beams constituting said cut panel frame. The outer wall panel has a width that is an integral multiple of the module width,
3. The building extension method according to claim 1 or 2, wherein said beam is connected to a position set back by a predetermined width from a position that is an integral multiple of said module width. When one side surface of the extension part is located near an external corner of the existing building, a position inside from the end of the external corner in the trunk while leaving the corner cover at the external corner 4. The method for extending a building according to claim 3, wherein the ceiling beam is connected to the . 5. The method according to any one of claims 1 to 4, wherein in said step B, a connecting metal fitting is bolt-connected to said exposed trunk, and said ceiling beam is bolt-connected to said connecting metal fitting. How to extend the listed building. The building extension according to any one of claims 1 to 5, characterized in that in the step A, a drainage steel plate for draining rainwater from the inside of the outer wall panel to the outside is installed at the cut location. Method.

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