JPH09158327A - Extension method of unit type building and extending building unit thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To install and extending building unit easily to an existing unit type building, and to connect the extending building unit firmly to the unit type building. SOLUTION: The external wall of one building unit 3A in a plurality of rectangular parallelopiped-shaped building units 3 is removed to form an opening section, and the opening side face 8A of an extending building unit 8 is conformed to the opening section. Connecting members are crossed among each upper beam and lower beam of the building unit 3A and the extending building unit 8, and these connecting members and each upper beam and each lower beam are united by screwing bolts and nuts, and the extending building unit 8 is annexed to the building unit 3A.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of expanding a unit type building in which an additional building unit is attached to a unit type building constructed by combining a plurality of building units, and the additional building unit.

[0002]

[Background Art] In a unit type building, a plurality of building units produced in a factory in advance are arranged as a lower floor building unit on a foundation at a construction site, and an upper floor building unit is placed on the lower floor building unit. It is built by placing it as.

[0003]

By the way, after the building is built, it may be necessary to renovate it due to changes in the family structure. However, the conventional unit-type building is built by combining a plurality of building units as described above, and the respective building units are connected to each other vertically and horizontally by connecting plates, pins and the like. An outer wall is attached to the outer periphery of the unit building. Therefore, it is difficult to attach the new extension building unit to the existing unit type building because it is difficult to join the extension building unit and the building unit of the existing unit type building.

An object of the present invention is to provide an extension method of a unit type building and an extension building unit thereof, in which the extension building unit can be easily attached to an existing unit type building and can be firmly connected.

[0005]

A method for expanding a unit type building according to the present invention will be described with reference to the drawings.
2, a plurality of rectangular parallelepiped building units 3, 4
A method of expanding a unit-type building in which an additional building unit 8 is attached to an existing unit-type building 1 that is constructed on a foundation 2 and is constructed by at least one building unit 3A of building units 3 and 4. The outer wall 15 is removed to form the opening 23, and then the opening side surface 8A of the extension building unit 8 is aligned with the opening 23, and at least one building unit 3A and the extension building unit 8 are joined, It is characterized in that an extension building unit 8 is attached to the existing unit-type building 1.

In the above, the unit-type building is not limited to, for example, one constructed by combining building units each having a frame having columns and beams, and a so-called wall-type construction building formed by connecting panels to each other. It may be built by combining units. Also, even if one additional building unit 8 is attached to the unit-type building 1,
It may be individual or more. Further, the extension building unit 8 may be attached in the long side direction of the unit 8 and the long side direction of at least one building unit 3A, or in the short side direction of each unit. Good. Further, the additional building unit 8 may be attached not only to the lower floor building unit of the unit-type building 1 but also to the upper floor building unit. in this case,
Below the extension building unit 8, the building unit on the lower floor must be arranged.

In the method for expanding a unit-type building according to the present invention, the outer wall 15 of one building unit 3A constituting the existing unit-type building 1 is removed and then formed on the outer wall 15. Align the opening side face 8A of the extension building unit 8 with the opening 23, and
Since it is sufficient to join A and 8, the extension building unit can be easily attached to the existing unit-type building.

In the unit type building extension method of the present invention, as shown in FIG. 3, at least one building unit 3A and extension building unit 8 are respectively provided with pillars 11,
11 'and the frames 14, 14' including the beams 12, 13, 12 ', 13' are provided, and the building unit 3A and the additional building unit 8 are straddled between the respective frames 14, 14 '. It may be joined by the joining members 25 and 26 which are curved. In the above, the joining member 25,
26 is a column 11, which is a constituent member of the frame 14, 14 ′,
11 'and between the beams 12, 12', 13, 13 'may be straddled, or both may be straddled.

In the method of adding a unit-type building according to the present invention, the building unit 3A and the building unit 8 attached to the building unit 3A are joined by the joining members 25 and 26. Joining member 25,
Since 26 extends between the frames 14 and 14 'of the units 3A and 8, the units 3A and 8 can be firmly connected.

In the unit type building extension method of the present invention, when the building unit 3A and the extension building unit 8 are joined by the joining members 25 and 26 extending between the respective frames 14 and 14 '. , As shown in FIGS.
Beams 12 and 13 that constitute the skeleton 14 on the opening 23 side of at least one building unit 3A have bolt holes 12A and 13A to which support members for supporting the outer wall are attached,
Beams 12 ', 1 constituting the frame 14' on the side of the opening 8A of the extension building unit 8 facing the beams 12, 13
In 3 ', through holes 12'A, 13'A for bolt insertion are previously opened on the horizontal extension from the positions of the bolt holes 12A, 13A to the opening 8A side of the extension building unit 8, and the joining members 25, 26 are provided. The first bolt insertion holes 25A and 26A corresponding to the bolt holes 12A and 13A in the vertical direction, and the second bolt insertion holes 25B and 26B corresponding to the through holes 12′A and 13′A in the vertical direction are opened and added. Aligning the building unit 8 with the openings 23 of the building unit 3A, each beam 12, 13,
After arranging 12 'and 13' facing each other, the beams 12 'and 13' of the extension building unit 8 and the beams 12 and 13 of the building unit 3A are laid across the joining members 25 and 26, 25, 26 first bolt insertion holes 25A, 26A
And the positions of the second bolt insertion holes 25B and 26B, the bolt holes 12A and 13A of the beams 12 and 13 of the building unit 3A, and the through holes 12'A and 13'A of the extended building unit 8 are made coincident with each other, and Holes 12A and 25
A, 12'A and 25B, 13A and 26A, 13'A and 2
The joining bolts 27 may be inserted into 6B and the joining bolts 27 and the nuts 28 may be screwed together to join the building unit 3A and the extension building unit 8.

In the method for expanding a unit type building according to the present invention, the joining members 25 and 26 are connected to the building unit 3
Beams 12, 12 ', 13, 1 of A and extension building unit 8
3'and the joining bolts 27 and the nuts 28 join to each other, so that the joining is strong and the bolt holes 12A formed in the beams 12 and 13 of the building unit 3A.
13A is originally a bolt hole for attaching the outer wall support member of the building unit 3A, and since the hole that has already been opened can be used, the bolt holes for the joining members 25 and 26 are provided in the building unit 3A. It does not have to be open, which saves labor and improves workability.

In the extension method for a unit type building of the present invention, as shown in FIGS. 3 and 5, the pillar 1 of the extension building unit 8 is used.
An insertion port 11'A into which a worker inserts his hand on one side of 1 '
The anchor member 35 is housed in the inside of the pillar 11 ′ in advance and the extension building unit 8 and at least one building unit 3A are joined together, and then the hand is inserted from the insertion port 11′A to the pillar 11 ′. You may grasp the anchor member 35 accommodated inside, extend this anchor member 35 downward from the bottom part of the pillar 11 ', and connect the lower part of this anchor member 35 to the foundation 2A.

In the above, the shape of the insertion port 11'A is
Any shape that allows the operator to insert his / her hand may be used, and the shape may be rectangular or round. The anchor member 35 may be a screw-shaped member or a rod-shaped member.

In the method of adding a unit type building according to the present invention as described above, the anchor member 35 is housed inside the pillar 11 ', and the additional building unit 8 is connected to the building unit 3A.
Since it is possible to extend downward from the bottom of the pillar 11 ′ and attach the lower part of this anchor member 35 to the foundation 2 A after attaching to
The outer wall 1 of the upper-floor building unit 4 above the building unit 3A
5 is located, the anchor member 35 does not get in the way when the extension building unit 8 is attached to the building unit 3A.
It can be attached to A.

In the extension method of a unit type building of the present invention, as shown in FIGS. 3 and 5, at least one building unit 3A of the foundation 2 and the extension building unit 8 are connected to each other at the joint portion. In order to mount the pillars 11 'and the lower beams 13' of eight, they may be formed in the extension portion 2A having a thickness larger than that of the foundation 2 of the building unit 3 in the existing unit-type building 1.

In the method for expanding a unit type building according to the present invention as described above, the pillar 11 'and the lower beam 1 of the expanded building unit 8 are used.
Since the part of the foundation 2 on which 3'is placed is the extension portion 2A, the extension building unit 8 can be easily placed and the foundation has sufficient proof strength.

The extension building unit of the present invention is shown in FIG.
As shown in FIG. 3, a plurality of rectangular parallelepiped building units 3,
The existing unit-type building 1 constructed by 4 and built on the foundation, which is an extension building unit 8 to be installed later, which is the building units 3 and 4 and the extension building unit 8
Are columns 11, 11 ', beams 12, 12', 1 respectively
The additional building unit 8 is provided with an anchor member 35 that is coupled to the foundation 2A, while being provided with the frameworks 14 and 14 'having the three and 13', and one side surface of the pillar 11 'on the side of the building unit 3 of the additional building unit 8. Is formed with an insertion port 11'A into which a worker inserts his / her hand to grasp the anchor member 35, and the inside of the post 11 'near the insertion port 11'A is used for storing the anchor member 35. A portion 30 is provided, and the storage portion 30 has a through hole 3 penetrating vertically.
0A is opened, and after the extension building unit 8 is joined to the building unit 3A, the anchor member 35 is attached to the pillar 1
A fixing member 3 extending downward from the bottom of 1'and fixing the lower portion of this anchor member 35 to a position where it can be coupled to the foundation 2A.
4 is provided.

In the above, the shape of the insertion port 11'A formed in the pillar 11 'may be any shape as long as the operator can insert his / her hand, and may be square or round. The anchor member 35 may be a screw-shaped member or a rod-shaped member.

In such an extension building unit according to the present invention, the anchor member 35 is housed inside the pillar 11 ', and after the extension building unit 8 is attached to the building unit 3A, the anchor member 35 is moved downward from the bottom of the pillar 11'. Since the lower part of the anchor member 35 can be joined to the foundation 2A, even when the outer wall 15 of the upper-floor building unit 4 is located above the building unit 3A, when the extension building unit 8 is attached to the building unit 3A. The anchor member 35 does not get in the way, so that the extension building unit 8 can be attached to the building unit 3A.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION A unit-type building according to an embodiment of the present invention will be described below with reference to FIGS. As shown in FIGS. 1 and 2, the extension method for a unit-type building according to the present embodiment is to attach an extension building unit 8 to an existing unit-type building 1. This unit type building 1
Includes a plurality of lower-floor building units 3 and a plurality of upper-floor building units 4 placed on the lower-floor building units 3, and further above the upper-floor building unit 4. A roof 6 is supported by the roof bundle 5 and the like. Then, the extension building unit 8 is attached to the two building units 3A, 3A of the plurality of lower floor building units 3 as described above.

As shown in FIG. 6, a building unit 10 constituting the lower-floor building unit 3 and the upper-floor building unit 4 has four pillars 11 erected at four corners and upper ends of these pillars 11. Skeleton 14 configured to have four upper beams 12 and four lower beams 13 for connecting the spaces and the lower ends to each other.
Is formed. And in this skeleton 14,
Inner wall and outer wall 15 (see FIG. 7), ceiling surface material, floor surface material, etc. are attached, and such a building unit 10 is formed in a substantially rectangular parallelepiped shape as a whole.

The outer wall 15 is, as shown in FIG.
An upper bracket 16 which is a support member having an L-shaped cross section attached to the upper beam 12 of the building unit 10 with a bolt and a nut 18, and a lower side which is a support member attached to the lower beam 13 with a bolt and a nut 18. It is attached to the skeleton 14 via a bracket 17. The lower bracket 17 has a vertical plate portion, and the outer wall 1 is attached to the lower end thereof.
The receiving portion for mounting 5 is provided in the middle of the vertical plate portion with a horizontal portion that extends in the opposite direction to the receiving portion and contacts the lower beam 13.

Therefore, the upper beam 12 has a bolt hole 12A for mounting the bracket 16, and the lower beam 13 has a bolt hole 13A for mounting the bracket 17. Also, the outer wall 15 and the bracket 1
Attachment with 6, 17 is carried out by inserting a bolt 20 into the embedded nut 19 previously embedded in the outer wall 15 from the inside of the brackets 16, 17 and screwing the bolt 20 and the embedded nut 19 together. .

In the building unit 3A having the above-mentioned structure, the outer wall 15 on one side to which the extension building unit 8 is attached is removed as shown in FIG. Means that the opening 23 having the size of the outer wall 15 is formed. Also,
The brackets 16 and 1 to which the outer wall 15 is attached
7 is also removed as shown in FIG. Therefore, the bolt holes 12A and 13A, which are opened in the upper beam 12 and the lower beam 13 of the building unit 3A and for mounting the brackets 16 and 17, respectively, are in a vacant state.

As shown in FIG. 3, the extension building unit 8 has a frame 14 'identical to the frame 14 of the building unit 10. The frame 14 'includes four pillars 11' that are erected at four corners, and four upper beams 12 'and lower beams 1 that connect upper ends and lower ends of the pillars 11'.
3'and. The outer wall is not attached to the joint surface of the extension building unit 8 with the building unit 3A, and thus the opening 8A is formed. Therefore, when the additional building unit 8 is aligned with the opening 23, the pillar 1 of the joint surface of the frame 14 ′ of the additional building unit 8 is
1 ', an upper beam 12', a lower beam 13 ', and a pillar 11, an upper beam 12, and a lower beam 13 of the opening 23 of the skeleton 14 of the building unit 3A.
And are facing each other next to each other. In addition, the bolt holes 12 are respectively provided in the upper beam 12 'and the lower beam 13' of the joint surface.
A, 13A and through holes 12'A, 1 corresponding to the horizontal direction
3'A is open.

As shown in FIGS. 3 and 4, the building unit 3A
After the additional building unit 8 is installed adjacent to the lower building 13, 3'and the upper beam 12,
The connecting members 25, 26 extending between the two 13, 13 ', 12, 12' are attached to the 12 ', so that both building units 3A, 8 are joined by these connecting members 25, 26. Has become.

That is, both connecting members 25, 26 are formed of a plate material such as an iron plate, and between the lower beams 13, 13 'of both building units 3A, 8 straddle the upper surfaces thereof, and the upper beam 1
Between 2 and 12 ', the lower surfaces are attached so as to straddle each other. Such connecting members 25 and 26 are provided at, for example, two places in the long side direction of both building units 3A and 8.

The connecting member 25 includes a first bolt insertion hole 25A corresponding to the bolt hole 12A in the upper beam 12 of the building unit 3A and the upper beam 12 'of the building unit 8 in the vertical direction.
The through hole 12'A and the second bolt insertion hole 25B corresponding to the vertical direction are opened. Also, connecting member 2
6 includes a first bolt insertion hole 26A corresponding to the bolt hole 13A in the lower beam 13 of the building unit 3A and the vertical direction.
And the through hole 12 'in the lower beam 13' of the building unit 8
A and the 2nd bolt penetration hole 26B corresponding to the up-and-down direction are opened.

Therefore, the connecting members 25 and 26 are laid across the adjacent lower beams 13 and 13 'and between the upper beams 12 and 12' of the building units 3A and 8 respectively, as shown in FIG. The bolt hole 12A and the first bolt insertion hole 25A, the through hole 12'A and the second bolt insertion hole 25B, and the bolt hole 1
3A and the first bolt insertion hole 26A, the through hole 13'A and the second
By inserting the bolt 27 into the bolt insertion hole 26B and screwing it with the nut 28, both building units 3
A and 8 will be joined.

As shown in FIGS. 3 to 5, the foundation 2A of the portion in which the extension building unit 8 is arranged is the extension building unit 8
Of the existing unit type building 1 so that the pillars 11 'and the lower beams 13' can be placed thereon, and
It is an additional part 2'with a thicker dimension, such as by adding concrete. Also, as shown in FIGS.
A foundation 2B for arranging the extension building unit 8 is continuously made in advance on the existing foundation 2.

As shown in FIGS. 3 and 5, a diaphragm 30 serving as a storage portion is provided below the pillar 11 'of the extension building unit 8, and an end plate 31 is provided below the diaphragm 30. . This diaphragm 3
0 has a nut 32 on the back side and an end plate 31
A cylindrical guide member 33 is preliminarily attached to the back surface of each of them on the same core and by welding.

Inside the pillar 11 'and above the diaphragm 30, there is a storage space for storing the anchor member 35, and the anchor member 35 can be stood upright on the upper surface of the diaphragm 30 for storage. Anchor member 35
For example, the upper end is threaded, and the lower end is formed with a screw member having a smaller diameter than the screw part.
Further, the anchor member 35 includes a fixing nut 36, and when the anchor member 35 is protruded toward the foundation 2A by a predetermined length, the anchor member 35 is screwed from the upper end of the anchor member 35 to the threaded portion thereof to form a nut. The diaphragm 30 is fastened and fixed between the nut 32 and 32, and the nut 32 and the fixing nut 36 form a fixing member 34.

An opening 11'A as an insertion port is formed on one side surface of the pillar 11 '(inside the interior of the extension building unit 8). The opening 11′A has a size such that a worker can insert his / her hand, and a size that does not protrude outside when the anchor member 35 is leaned against the upper surface of the diaphragm 30, and is a rectangle long in the vertical direction. Has become.

On the other hand, the anchor member 35 in the foundation 2A
A sheath tube 40 ′ is embedded in advance at the place where is provided, and the sheath tube 40 ′ is filled with grout 41 before inserting the anchor member 35. A back nut 42 is attached to the end plate of the pillar 11 of the building unit 3A, a sheath tube 40 filled with grout 41 is embedded in the foundation 2, and the foundation bolt 42 in the sheath tube 40 is used to build the building. The unit 3A and the foundation 2 are fixed.

Next, a method of adding a unit type building to which the extension building unit 8 is attached to the existing unit type building 1 will be described. First, of the plurality of building units 3 and 4 that compose the existing unit-type building 1, the extension building unit 8
The outer wall 15 of the building unit 3A to which is attached is removed from the brackets 25 and 26 attached to the upper beam 12 and the lower beam 13 of the building unit 3A, and subsequently these brackets 25 and 26 are also removed.

Thereafter, as shown in FIG. 2, the opening 8A of the extension building unit 8 suspended by a crane is aligned with the opening 23 of the building unit 3A, and the building unit 3
The upper beams 12 and 12 'and the lower beams 13 and 13' of A and the additional building unit 8 are arranged to face each other, and the foundations 2A and 2B are arranged.
Place it on top of.

In this state, the upper joint member 2 is provided between the upper beams 12 and 12 'of the building unit 3A and the extended building unit 8.
5, and the lower joint member 26 is straddled between the lower beams 13 and 13 ′, and the bolt hole 12A, the first bolt insertion hole 25A, the through hole 12′A, and the second bolt insertion hole 25.
B, a bolt hole 13A, a first bolt insertion hole 26A, and a through hole 13'A and a second bolt insertion hole 26B are respectively inserted with bolts 27, and nuts 28 are screwed into these bolts 27 to form a building unit. 3A and the extension building unit 8 are connected.

Next, by inserting a hand into the opening 11'A of the pillar 11 'of the extension building unit 8, the anchor member 35 previously stored inside the pillar 11' is taken, and its lower end is taken from above the diaphragm 30. Insert it into the nut 32 and the guide member 33, and then attach the upper screw to the fixing nut 3
While being screwed into 6, it is inserted into the sheath tube 40 which is filled with the grout 41 in advance. After that, the anchor member 35 is fixed with the fixing nut 36, and the extension building unit 8 is fixed to the foundation 2
Fixed to After that, for example, the joint between the building unit 3A and the extension building unit 8 is filled with a filling material or waterproofed to complete the extension of the unit-type building 1.

According to the above-described embodiment, the following effects can be obtained. That is, in order to attach the extension building unit 8, the extension building unit 8 is fitted to the opening 23 from which the outer wall 15 of the building unit 3A is removed, and the upper beams 12, 12 'and the lower beams 13, 1 of the respective units 3A, 8 are attached.
3 ′ may be joined to each other by the upper joining member 25 and the lower joining member 26, and the extension building unit 8 may be fixed to the foundation 2, whereby the extension of the unit-type building 1 can be easily performed.

Further, the bolt holes 12A and 13A for connecting the building unit 3A and the extension building unit 8 with each other through the upper joining member 25 and the lower joining member 26, and the through hole 1
Among 2'A and 13'A, the bolt holes 12A and 13A of the building unit 3A are for attaching the upper bracket 16 and the lower bracket 17 for supporting the outer wall 15 to the upper beam 12 and the lower beam 13 of the building unit 3A. Since it has already been opened as a hole, and this existing hole can be used, it is not necessary to open a new hole at the site of the extension, and labor is saved, thereby improving workability.

Further, in the building unit 3A and the extension building unit 8, the upper beams 12, 12 'and the lower beams 13, 13' of the units 3A, 8 are connected via the upper joining member 25 and the lower joining member 26. These joined members 25 and 2 are joined.
Since 6 is provided between the upper beams 12 and 12 'and the lower beams 13 and 13', a strong joint is formed.

Further, the anchor member 35 of the extension building unit 8 is housed inside the pillar 11 'so as to stand against the diaphragm 30, and after the extension building unit 8 is placed on the foundation 2, the pillar 11'. From the inside of the sheath tube 4 of the foundation 2
Since it may be inserted into the inside of 1 and fixed with the fixing nut 36, even when the outer wall 15 is attached to the upper floor building unit 4 above the building unit 3A, when the extension building unit 8 is attached to the building unit 3A, The anchor member 35 does not get in the way, so that the extension building unit 8
Can be easily attached to the base 2.

The present invention is not limited to the above-described embodiment, but includes the following modifications as long as the object of the present invention can be achieved. For example,
In the above-described embodiment, the anchor member 35 is formed by screwing the upper end portion and the lower end side is formed by a screw member having a smaller diameter than the screw portion. However, the present invention is not limited to this, and the entire length may be threaded. . However, if this is done, it takes time to screw in, but there is an effect that the engagement between the grout 41 and the threaded portion in the sheath tube 40 'becomes firm.

[0044]

As described above, according to the method for expanding a unit type building of the present invention, after the outer wall of one building unit constituting an existing unit type building is removed,
Since it is only necessary to join both building units by aligning the opening side face of the additional building unit with the opening formed in the outer wall portion, the additional building unit can be easily attached to the existing unit type building.

Further, according to the extension building unit of the present invention, the anchor member is housed inside the pillar, and after the extension building unit is attached to the building unit, it is extended downward from the bottom of the pillar and the anchor member Since the lower part can be connected to the foundation, even when the outer wall of the upper-floor building unit is located above the building unit, the anchor members do not interfere when the additional building unit is attached to the building unit, which allows the additional building to Units may be attached to building units in a unit building.

[Brief description of the drawings]

FIG. 1 is an overall perspective view showing a unit-type building applied to a method for expanding a unit-type building according to an embodiment of the present invention.

FIG. 2 is an overall side view showing a process in which an extension building unit is being attached to an existing unit-type building of the present embodiment.

FIG. 3 is a perspective view showing a main part of the present embodiment.

FIG. 4 is a cross-sectional view showing a joined state of a beam of the building unit and a beam of the extended building unit of the present embodiment.

FIG. 5 is a cross-sectional view showing a combined state of the building unit and the extended building unit of the present embodiment with the foundation.

FIG. 6 is an overall perspective view showing a skeleton of the building unit of the present embodiment.

FIG. 7 is a cross-sectional view showing an outer wall attached to the frame of the building unit of the present embodiment.

FIG. 8 is a perspective view showing the relationship between the bracket for mounting the outer wall and the beam of the present embodiment.

[Explanation of symbols]

1 Existing unit-type building 2 Foundation 2'Foundation extension part 3A Building unit to which extension building unit is attached 8 Extension building unit 8A Opening of extension building unit 12, 12 'Upper beam forming frame of extension unit and extension building unit 13, 13 'Lower beam constituting frame of building unit and additional building unit 14, 14' Frame of building unit and additional building unit 15 Outer wall 16 Upper bracket 17 which is a supporting member 17 Lower bracket 23 which is a supporting member 23 Opening 25 Upper joining member 26 Lower joining member 35 Anchor member

Claims (6)

[Claims] 1. A method for expanding a unit type building, wherein an additional building unit is attached to an existing unit type building composed of a plurality of rectangular parallelepiped building units and built on a foundation. An outer wall of at least one building unit is removed to form an opening, and then an opening side surface of the extension building unit is aligned with this opening, and the at least one building unit and the extension building unit are joined together. An extension method of a unit type building, characterized by adding an extension building unit to the existing unit type building. 2. The unit-type building extension method according to claim 1, wherein the at least one building unit and the extension building unit each include a frame including columns and beams, and these building units and extension are provided. A method for expanding a unit-type building, wherein the building units are joined by joining members that straddle the respective frames. 3. The unit building extension method according to claim 2, wherein the beam constituting the frame on the side of the opening of the at least one building unit has a bolt to which a supporting member for supporting the outer wall is attached. For a beam that has a hole and constitutes the framework on the side of the opening of the extension building unit facing the beam, bolts are preliminarily provided on the horizontal extension from the bolt hole position to the opening side of the extension building unit. A through hole for insertion is opened, a first bolt insertion hole corresponding to the bolt hole in the vertical direction, and a second bolt insertion hole corresponding to the through hole in the vertical direction are opened in the joining member, and After the extension building unit is aligned with the opening of the building unit and the respective beams of the building unit and the extension building unit are arranged to face each other, the extension building unit The beam of the building unit and the beam of the building unit, the first connecting member
The bolt insertion hole and the second bolt insertion hole are aligned with the bolt hole of the beam of the building unit and the through hole of the extension building unit, and joint bolts are inserted into the respective holes, and these joint bolts are connected. And a nut are screwed together to join the building unit and the additional building unit to each other. 4. The unit-type building extension method according to claim 1, wherein an insertion port into which an operator inserts his / her hand is formed on one side surface of the pillar of the extension building unit. In addition, an anchor member is previously housed inside the pillar, and after joining the extension building unit and the at least one building unit, hands are inserted from the insertion port and housed inside the pillar. And the anchor member is extended downward from the bottom of the pillar, and the lower part of the anchor member is connected to the foundation, so that the unit type building is expanded. 5. The unit-type building extension method according to claim 1, wherein a site of a joint between the at least one building unit and the new building unit in the foundation is the new building unit. In order to mount the pillars and lower beams of the above, the method for expanding a unit-type building is characterized in that it is formed in an extension part having a thickness dimension thicker than the foundation of the part of the building unit in the existing unit-type building. . 6. An extension building unit which is constructed by a plurality of rectangular parallelepiped building units and is built on an existing unit-type building on a later date, wherein the building unit and the extension building unit are pillars. A frame having a beam, and the additional building unit includes an anchor member that is coupled to the foundation, and one side of the pillar on the side of the building unit of the additional building unit is provided for holding the anchor member. An insertion port through which an operator inserts his / her hand is formed, and inside the vicinity of the insertion port of the pillar, a storage portion for storing the anchor member is provided,
A through hole penetrating in the up-down direction is opened in the storage portion, and after the extension building unit is joined to the building unit, the anchor member is extended downward from the bottom of the pillar, and the lower portion of the anchor member is An extension building unit of a unit-type building, which is provided with a fixing member that is fixed to a position where it can be connected to a foundation.