JPH07217228A - Building structure and building method - Google Patents

Abstract

PURPOSE:To realize story-extension work easily, quickly, and at a low cost, while residents are successively living inside an existing building structure. CONSTITUTION:An initial building structure is made up of a two-storied building with an attic consisting of a fixed structure 1 that has been fixed to an installation ground G via a foundation part 2, and a roof-truss structure 3 that has been detachably connected to the upper part of this fixed structure. A ceiling part 13 is integrally formed on the fixed structure, while the roof-truss structure is integrally formed in such a way that the upper surface thereof is covered by a roof member 32 so as to provide an attic 36 in its inside and that it can resist lifting and transportation as a whole. The fixed structure and the foundation part are previously constructed so as to have the strength capable of resisting the load of three-storied building. When the story is extended, first, the roof-truss structure is separated from the fixed structure and held in an upper position, and next, extension members are build up on the fixed structure for constructing an extended-story structure, and then the separated roof-truss structure is again put thereon and connected thereto.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a building structure which can be easily expanded in the future and a method of building the expanded structure.

[0002]

2. Description of the Related Art Conventionally, it is possible to convert an original house into a two-story building structure by adding a second floor to an existing one-story house to increase the number of floors. It is done individually according to. In this case, first strip off the roof tiles of the existing house, and then
The roof structural members are dismantled and the ceiling is cut open. Then, the foundation for the second floor is newly built, the second floor is expanded by the pillars from the foundation, and the roofing material is arranged on the roof of the second floor.

[0003]

However, in the above-mentioned conventional existing building structure and its extension method, since it is necessary to cut off the portion from the roof to the ceiling of the existing house, during the period of the floor expansion work, Residents are forced to move their internal luggage to other places and temporarily live in other places. In other words, it will not be possible to continue living until then. Moreover, it is necessary to build a stronger foundation for the two-story building separately from the existing foundation for the one-story building, or to change the existing foundation, and It is necessary to consider the placement,
This often leads to complicated construction, lengthened construction period, and increased costs. Therefore, in order to avoid the above-mentioned complication, it is often the case that the existing building structure is dismantled and a new two-story building structure is rebuilt. In this case, the dismantling cost and the two-story building are used. This will double the cost of building a new structure. In addition, a large amount of waste is generated both in the case of the above-mentioned extension method and in the case of new construction after dismantling.

The present invention has been made in view of such circumstances, and its object is, firstly, to realize future increase of floors in a building structure simply, quickly and at low cost. Especially. Secondly, in the construction method for increasing the number of floors, the number of floors can be increased while the resident lives in the existing building structure, and the waste can be prevented.

[0005]

In order to achieve the above object, the invention according to claim 1 has a ceiling portion integrally formed at an upper end portion, and the lower end portion is installed ground through a foundation portion. The roof structure which is fixed to the fixing structure and the upper surface is integrally covered with a roofing material so as to withstand vertical transportation as a whole, and the lower end is detachably connected to the upper end of the fixing structure. With. Then, the fixing structure and its foundation are formed so as to have a strength corresponding to a structure of two or more stories.

According to a second aspect of the present invention, in the first aspect of the invention, the floor portion of the additional structure for increasing the number of floors in the future is integrally formed on the upper surface of the ceiling portion of the fixing structure in advance. It is configured to be formed in.

According to a third aspect of the present invention, in the first aspect of the invention, a floor is provided at the lower end of the shed structure to form a shed inside. Then, the fixing structure and its foundation are formed so as to have a strength corresponding to a structure having three or more stories.

According to a fourth aspect of the present invention, in the third aspect of the present invention, the floor portion of the shed structure is reinforced so that the shed structure as a whole can endure vertical transportation.

According to a fifth aspect of the invention, in the first aspect of the invention, each structure is formed by a frame wall structure.

The invention according to claim 6 is a construction method for constructing a building structure in which one or more layers are added to the building structure according to claim 1. That is, the lower end is fixed to the installation ground through the foundation, and the ceiling is integrally attached to the upper end of the fixing structure. For the existing building structure in which the lower end of the built roof structure is detachably connected, the foundation of the anchoring structure is formed in advance to have a strength corresponding to at least the number of layers to be increased. I'll do it. Then, first, a separating step for separating the roof structure from the upper end of the fixing structure is performed,
Next, an expansion process is performed to build one or more levels of floor-extending structure on the above-mentioned anchoring structure, and finally the above-mentioned separated roof structure is installed on this floor-extending structure. It is configured to perform a roof-group connecting step for connecting the two to each other.

According to a seventh aspect of the present invention, in the invention according to the sixth aspect, the additional step is performed in a state where the roof frame structure separated by the disconnecting step is held above the fixing structure. It is a thing.

Further, in the invention described in claim 8, in the invention described in claim 6, the building of the additional floor structure in the extension step is constructed by a frame wall construction method.

[0013]

With the above construction, in the invention according to claim 1,
Since the shed structure is detachably connected on the fixing structure, by separating the shed structure, it is possible to build a structure of the second floor or more on the fixing structure. The additional floor construction is completed by connecting the above-mentioned separated roof frame structure to it. At this time, the fixing structure and the base portion are formed from the beginning so as to have a strength corresponding to a structure having two or more floors, and in addition, a ceiling portion is integrally formed at an upper end portion of the fixing structure. Since it is independent of each other, it is possible to increase the number of floors without changing the above-mentioned foundation part and the above-mentioned anchoring structure itself and without changing the wiring and piping inside the above-mentioned anchoring structure. Becomes For this reason, the above wiring and piping can be continuously used in the anchoring structure, and it is possible to perform the floor increase work while the resident's life is continued.
The generation of waste due to the increase of floors will be reduced or eliminated as much as possible. Moreover, since the rooftop structure is integrated and can be moved up and down as a whole, it is possible to perform work for increasing the number of floors by simply moving up and down the entire rooftop structure without stripping off roofing materials. Therefore, the construction can be facilitated, the construction period can be shortened, and the cost can be reduced. Therefore, at the beginning, a one-story building structure consisting of a fixed structure and a shed structure was built, and the floor area was expanded by increasing the number of floors several years later depending on the circumstances such as the growth of children thereafter. It is easily possible to use the building structure as it is.

According to the second aspect of the invention, in addition to the function of the first aspect of the invention, the floor portion of the additional structure for increasing the number of floors in the future is provided on the upper surface of the ceiling portion of the fixing structure. Since it is integrally formed, in the case of future expansion work,
The inside of the anchoring structure is reliably shielded from the outside by the above-mentioned floor, which makes it more comfortable to continue living inside, and the above-mentioned floor can be used as a workbench for building upstairs structures. It is easy and efficient.

According to the third aspect of the present invention, in addition to the operation according to the first aspect of the present invention, since the cabin back room is formed inside the cabin structure, the initial fixing structure and the cabin structure are formed. A building structure consisting of objects is constructed as a two-story attic. Further, since the fixing structure and the foundation portion thereof are formed for three or more stories from the beginning, it is possible to easily increase the number of stories to three stories according to the circumstances thereafter.

According to the invention described in claim 4, in addition to the function of the invention described in claim 3, since the floor portion of the roof structure is reinforced, it is possible to increase the number of floors of the existing building structure. When carrying out, it becomes possible to separate and move up and down the shed structure while leaving the tools inside the shed.

According to a fifth aspect of the present invention, in addition to the operation according to the first aspect of the present invention, each structure such as a fixing structure is formed by a frame wall structure of a 2 × 4 structure (two-by-four structure). Not of concrete construction,
In a wooden building structure, it can be applied to an increase of floors from one floor to two floors or from two floors to three floors.

In the invention according to claim 6, the construction for increasing the number of floors of the existing building structure includes a separation process, an expansion process,
The steps for connecting the huts are carried out in this order. That is, the existing building structure consisting of the anchoring structure and the roof structure is separated from the upper end of the anchoring structure in the disconnecting process, and the floor is expanded above the anchoring structure in the adding process. The structure is built, and the roof structure structure separated in the separation process is connected to the upper end of the expansion structure in the roof structure connection process, and an extension of the floor corresponding to the expansion structure is completed. finish. At this time, since it is not necessary to change the inside of the fixing structure, the construction can be performed while the resident's life in the fixing structure is continued. In addition, the construction can be performed without changing the roof structure itself, and the anchoring structure and its foundation are preformed so as to have a strength corresponding to the number of floors of the building structure to be expanded. Since the work can be performed without changing the fixing structure and the foundation, the construction period and cost can be reduced.

According to the seventh aspect of the invention, in addition to the operation of the sixth aspect of the invention, the additional step is performed while the roof structure structure separated in the separation step is held above the fixing structure. Therefore, the upper side of the fixing structure after separating the shed structure is always covered with the shed structure until the end of construction. For this reason, it is possible to take measures against rain during the construction of the fixing structure by using the roof structure after the separation.

According to the invention of claim 8, in addition to the operation according to the invention of claim 6, since the building of the expanded structure in the expansion step is carried out by the frame wall construction method, the structure of the expanded structure is built. Easy and quick to include.

[0021]

Embodiments of the present invention will be described below with reference to the drawings.

<Construction of Building Structure> FIG. 1 and FIG.
1 illustrates a two-story attic building structure according to an embodiment of the present invention. In the figure, 1 is a fixing structure that constitutes the first floor portion fixed to the ground G via a foundation 2, and 3 is a roof frame structure connected to the upper end of the fixing structure 1.

The fixing structure 1 is constructed by integrally mounting a ceiling portion 13 on an upper end portion of a peripheral wall portion 12 which is built up from a floor portion 11 at the lower end portion, and a lower end portion thereof is the base portion 2 described above. It is fixed to. The ceiling portion 13 has a double structure for an extension work in the future by adding floors, and a floor portion 41 for future extension structures (see reference numeral 4 in FIG. 6) is integrally formed on the upper surface in advance. On the other hand, the structural members such as the peripheral wall portion 12 are formed in advance so as to have a strength corresponding to a building structure for a floor including a plan to increase the number of floors in the future. Then, as shown in an example of the floor plan in FIG. 3, a living space 14 is formed inside.

Similar to the fixing structure 1, the foundation 2 is also formed in advance so as to have a strength corresponding to a building structure for a floor including a future floor increase plan. Initially, as a two-story wooden building structure at the back of the hut, if there is a plan to increase the number of floors to a three-story wooden structure at the back of the hut, for example, a foundation with a width of 15 cm that can accommodate three floors will be formed in advance. Has been done.

In the roof structure 3, the roof member 32 is stretched on the upper surface of the roof structure 31, and the floor portion 33 is integrally provided on the lower surface thereof. As shown in FIG.
The floor 33 and the surrounding walls 34, 34, 35, 35, etc., partition the interior of the attic (attic) 36.
Are formed. The floor set on the lower surface of the floor portion 33 of the attic 35 is reinforced so that the whole of the above-mentioned shed structure 3 can be vertically moved. This reinforcement is performed, for example, by providing the floor 33 with a double floor structure or providing a reinforcing plate at a main portion such as four corners. And
The lower end of the roof structure 3 has the fixing structure 1 described above.
It is detachably connected to the upper end of the building for future expansion work.

The fixing structure 1 and the shed structure 3 are made of wood using a frame wall structure of 2 × 4 structure.

Reference numeral 15 in FIGS. 3 and 4 denotes a stairway portion provided in the fixing structure 1 to connect the living space 14 and the attic 36, and the stairway portion 15 is connected to the ceiling portion 13. An opening 13a provided through the floor 33,
33a.

FIGS. 5 and 6 show the two-storied attic building structure, which is subsequently expanded to a three-story attic building structure, where 4 is the original anchoring structure 1 and the hut structure. It is an expanded structure that has been added to the structure 3, and the expanded structure 4 constitutes the second floor after the expansion, and the attic 36 of the roof structure 3 in the figure is the third floor. Make up part.

The floor-extending structure 4 is constructed by the 2 × 4 method using the floor 41 integrally formed as the ceiling 13 of the fixing structure 1 as a platform. It is composed of a peripheral wall portion 42 of a framed wall structure built up in, a middle wall 43, etc., and a living space 44 is formed inside, as shown in an example of a floor plan in FIG. 7. Then, the lower end of the shed structure 3 is detachably connected to the upper end of the increased floor structure 4 as in the case of the original two-storey attic. In addition, 45 in FIG.
Is a staircase, and the opening 1 of the ceiling 13 of the fixing structure 1
3a and the opening 33a of the floor 33 of the shed structure 3 interposed between the stairs 1 of each floor up to the attic 36.
5,45 are continuous.

<Structure of Construction Method> Next, from the original two-story attic building structure shown in FIG. 1 to the attic 3 shown in FIG.
A construction method for increasing the number of stories in a story building structure will be described with reference to FIGS. 8 and 9.

This building method comprises a separating process, an adding process, and a shed connecting process. First, in the separating process, as shown in FIG. 8, the lower end of the shed structure 3 and the fixing structure 1 are separated. The roof structure 3 is separated from the fixing structure 1 by disconnecting it from the upper end. Next, in the expansion step, as shown in FIG. 9, the expanded structure 4 is built on the anchoring structure 1 from which the shed structure 3 has been separated, and in the shed connection step, the separation step is performed. The roof structure 3 cut off in step 3 is placed on the above-mentioned floor structure 4, and the lower end of this roof structure 3 and the floor structure 4 are added.
And the upper end of the. This completes the three-story building structure behind the hut.

A jack-up method using a jack is mainly used for separating the above-mentioned shed structure 3, but a lift-up method using a crane may be used.
When adopting the jack-up method, in addition to the double girder method in which a jack is placed on the ground G up to a predetermined height and the jack is placed on top of it, a support climbing method in which sequential addition is performed, which is a more preferable method from the viewpoint of lift efficiency, is performed. Be seen.

In order to build the expanded structure 4 into the fixing structure 1 in the addition process, the roof structure 3 separated in the separating process is held at a predetermined position above the fixing structure 1 by the jack-up method. In this state, the members for increasing the floor, such as the unit wall parts of the framed wall structure, which have been factory manufactured in advance, are carried onto the floor part 41 and assembled to form the peripheral wall part 42 and the like.

<Operation / Effect of Embodiment> Next, the operation / effect of the above-mentioned building structure and construction method will be described.

In the case of the building structure shown in FIG. 1, since the attic 36 is formed in the shed structure 3, the building initially constructed is a two-story attic structure. afterwards,
In order to expand the floor space by increasing the number of floors to three floors in the attic according to circumstances such as the growth of children, the anchoring structure 1 and its foundation 2 support the three-story structure from the beginning. The roof structure 3 is detachably connected to the fixing structure 1, and the roof structure 3 is integrated so that it can be moved up and down as a whole. Therefore, by separating the roof structure 3 from above, it is possible to build the structure of the second floor and above on the fixing structure 1 as it is. By connecting the above-mentioned shed structure 3 separated as it is to the above, it is possible to finish the work of increasing the number of stories. In other words, it is not necessary to newly build a strong member or foundation in the fixing structure 1 or to change the initial fixing structure 1 itself or the base portion 2 itself, and to remove the roofing material 32. In addition, it is possible to use the original anchoring structure 1 and the roof structure 3 as they are to perform the floor increase work, and also to increase the floor increase work without dividing the electrical wiring and water pipes inside the anchorage structure 1. Therefore, the construction period can be shortened and the cost for increasing the number of floors can be reduced. Further, since the ceiling portion 13 of the fixing structure 1 blocks the construction space for increasing the number of floors, it is possible to perform the increasing floor construction while the resident's life in the fixing structure 1 is continued. , It is possible to significantly reduce the burden on the residents due to the construction of additional floors. Furthermore, since it is possible to increase the number of floors by simply separating the entire roof structure 3 from the anchoring structure 1, the number of floors can be increased without changing the existing ones 1, 2 and 3 as described above. Compared with the case of conventional extension or new construction after dismantling, the generation of waste can be greatly reduced or eliminated.

Further, since each structure such as the fixing structure 1 is formed by the frame wall structure of 2 × 4 structure, even if it is not a concrete structure, in a wooden construction structure, from the first floor to the second floor. It is possible to build or increase the number of floors from two to three.

On the other hand, in the case of the construction method of this embodiment for increasing the number of floors from that of FIG. 1 to that of FIG. 5, as described above, the roof structure 3 must be transported as a whole without any change. Therefore, in the separating step, if the roof structure 3 is simply separated from the fixing structure 1 upward,
The extension process for the fixing structure 1 can be started. Then, in the expansion step, it is only necessary to build the floor-extending structure on the anchoring structure 1, and finally, in the roof-group connecting step, the roof-structure structure 3 is installed on the floor-extending structure 4. Only by doing so, it is possible to add a three-story attic to the building very easily compared to the conventional extension method.

Since the floor 33 of the shed structure 3 is strengthened during the above-mentioned expansion process, the shed structure 3 is separated and lifted while the tools in the attic 36 are left as they are. It can be transported, and since the floor portion 41 for the additional structure 4 is integrally formed in advance on the ceiling portion 13 of the fixing structure 1, the expansion after the separation of the roof structure 3 is performed. The steps and the like can be performed on the floor portion 41, the work for construction can be easily performed, and the life in the fixing structure 1 is not supported.

Further, when the expansion process is carried out in a state in which the shed structure 3 separated in the separation process is held above the fixing structure 1, the above-mentioned shed structure is kept above the fixing structure 1 until the completion of construction. Since it is always covered with 3, the main measures against rain of the fixing structure 1 can be taken by the roof structure 3 and only a waterproof sheet or the like needs to be supplementarily added, thus saving labor. You can

Further, when the two-story building structure shown in FIG. 1 is expanded to a three-story or more building structure shown in FIG. 5, in this embodiment, the additional floor is formed in advance by factory production. Since the work is completed only by assembling the floor-extending member having the above-mentioned frame wall structure and using the floor 41 as the platform, the construction period can be shortened and the construction can be facilitated more easily. it can.

<Other Embodiments> The present invention is not limited to the above embodiments, but includes various other modifications. That is, in the above-described embodiment, the hut structure 3 has the hut attic 36 formed therein, and the original building structure is configured as a two-story attic, but the present invention is not limited to this. The floor structure 33 and the like may be omitted, and the original building structure may be configured as a one-story building structure having a roof function. In this case, the initial fixing structure 1 and the foundation portion 2 may be formed in advance to have a strength corresponding to that for a two-story building or one for a three-story building or more, depending on a plan for increasing the number of floors in the future.

In the above embodiment, the number of floors from the second floor of the attic to the third floor of the attic has been increased. However, the present invention is not limited to this, and from the second floor of the attic to a building structure of, for example, four or more floors. You may go upstairs. In this case, the fixing structure 1 and the foundation 2 may be formed in advance to have a strength corresponding to the building structure to be expanded. This makes it possible to increase the number of floors more easily than the initial number of floors, depending on the circumstances thereafter.

In the above-mentioned embodiment, the case where the expanded structure 4 is built in the extension process by the 2 × 4 construction method is shown, but the construction is not limited to this, and a conventional wooden construction method may be used.

Further, in the above-mentioned embodiment, the building of the expanded structure in the addition process is assembled and built on the fixing structure 1, but the invention is not limited to this, and the expanded structure is preliminarily prepared. It may be configured by a box-shaped unit structure manufactured at the factory. In this case, as shown in FIG. 10, for example, the additional steps are separated by the separating step.
Is held at a predetermined position above the fixing structure 1 by the jack-up method or the lift-up method, and the box-type unit structure 4 is moved laterally between the two 1 and 3 so that the box-type unit structure 4 is moved above the fixing structure 1. After that, the roof structure 3 may be lowered and installed on the box-type unit structure 4. In addition, as shown in FIG. 11, for example, in a state where the separated shed structure 3 is temporarily placed on the ground G, the box-shaped unit structure 4 is lifted by a crane or the like and installed on the fixing structure 1, Thereafter, the temporarily placed shed structure 3 may be hoisted and installed on the box-shaped unit structure 4.

Further, in the above-mentioned embodiment, the wooden construction using the framed wall structure is shown, but the present invention is not limited to this, and it is applied to an increase in the number of floors from one floor to two floors by the conventional construction method. Alternatively, the fixing structure, the floor-extending structure, and the shed structure may be formed by a PC concrete box prefabricated structure.

[0046]

As described above, according to the building structure of the invention of claim 1, since the roof structure structure is detachably connected to the fixing structure, the roof structure structure is detachable. 2 on top of the fixing structure by disconnecting
It is possible to build a structure above the floor portion, and by connecting the separated rooftop structure to the structure again, it is possible to finish the work of increasing the number of stories. At this time, the fixing structure and the foundation are formed from the beginning so as to have a strength corresponding to a structure of two or more stories, and in addition, a ceiling is integrally formed at the upper end of the fixing structure. Since they are independent, the fixing structure itself, internal wiring, piping, etc. and the foundation can be used as they are without modification. For this reason, it is possible to perform the additional floor construction while the resident in the anchoring structure continues to live, and it is possible to significantly reduce the burden on the resident due to the additional floor construction and to increase the number of floors. It is possible to reduce or eliminate the accompanying waste generation as much as possible. Moreover, since the rooftop structure is integrated and can be moved up and down as a whole, the entire rooftop structure can be moved up and down without stripping the roofing material, etc. It is possible to facilitate the construction, shorten the construction period, and reduce the cost. Therefore, initially, for example, a one-story building structure consisting of a fixed structure and a roof structure is built, and the floor area is expanded by increasing the number of floors several years later according to the circumstances such as the growth of children thereafter. The above building structure can be used as it is.

According to the second aspect of the present invention, in addition to the effect of the first aspect of the present invention, in the upper structure of the ceiling portion of the fixing structure, a structure for increasing the number of floors for increasing the number of floors in the future is provided. Since the floor is integrally formed, the floor of the anchoring structure can be reliably cut off from the outside when the floor is expanded in the future, making it more comfortable to continue living inside. The floor can be used as a workbench for building an expanded structure, which facilitates work and improves efficiency.

According to the third aspect of the present invention, in addition to the effect of the first aspect of the invention, since the back room is formed inside the shed structure, the initial fixing structure and the shed. It is possible to construct a building structure consisting of a group structure as a two-story attic, and the anchoring structure and its foundation are formed from the beginning for three or more floors, so the situation after that Depending on the situation, it is possible to easily increase the original two-story building to a three-story building or more.

According to the invention described in claim 4, in addition to the effect of the invention described in claim 3, since the floor portion of the roof structure is reinforced, the number of floors of the existing building structure is increased. At the time of construction work, it is possible to separate the shed structure and carry it up and down while leaving the tools inside the shed.

According to the invention of claim 5, in addition to the effect of the invention of claim 1, since each structure such as a fixing structure is formed by a frame wall structure, a wooden building structure. It can be applied to the increase of the number of floors from one floor to two floors or from two floors to three floors.

According to the sixth aspect of the present invention, the work for increasing the number of floors of the existing building structure can be easily and quickly performed by the separating process, the adding process, and the shed assembly connecting process. That is, for an existing building structure consisting of a fixing structure and a shed structure, the shed structure is separated from the upper end of the fixing structure in a cutting process, and the upstairs structure is added to the above-mentioned fixing structure in an expansion process. It is easy to increase the number of floors corresponding to the above-mentioned floor-extending structure simply by connecting it to the upper end of the above-mentioned floor-extending structure in the roof-joining process by building it on top Can be done. At this time, it is not necessary to make changes to the above-mentioned shed structure itself, and the anchoring structure and its foundation are formed in advance so as to have strength corresponding to the number of stories of the building structure to be expanded. Since it is possible to carry out the construction without changing the anchoring structure and foundation, it is possible to shorten the construction period and cost, and also to reduce the waste generation due to the increase in floor space as much as possible or It can be resolved. In addition, since it is not necessary to change the inside of the fixing structure such as wiring and piping,
Construction can be performed while the resident's life in the anchorage structure is continued.

According to the invention of claim 7, in addition to the effect of the invention of claim 6, an additional step is carried out in a state in which the roof frame structure separated in the disconnecting step is held above the fixing structure. Since this is done, the upper part of the fixing structure after separating the shed structure can be always covered by the shed structure until the end of the construction. Therefore, it is possible to take measures against rain in the fixing structure by the separated rooftop structure, and labor saving can be achieved accordingly.

According to the invention described in claim 8, in addition to the effect of the invention described in claim 6, since the structure for increasing the number of floors is built by the frame wall construction method in the additional process, the number of floors is increased. The structure can be built easily and quickly.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of the present invention.

FIG. 2 is a partially omitted cross-sectional view taken along the line AA of FIG.

3 is a partially omitted cross-sectional view taken along line BB of FIG.

4 is a partially omitted cross-sectional view taken along the line CC of FIG.

FIG. 5 is a front view of the building structure of FIG. 1 with an expanded floor.

6 is a partially omitted cross-sectional view taken along the line DD of FIG.

7 is a partially omitted cross-sectional view taken along the line EE of FIG.

FIG. 8 is a view corresponding to FIG. 1 showing a separating step.

FIG. 9 is a view corresponding to FIG. 5 showing an extension process and a shed assembly connection process.

FIG. 10 is a process explanatory view showing an aspect of an addition process.

FIG. 11 is a process explanatory view showing another aspect of the addition process.

[Explanation of symbols]

 1 Anchored structure 2 Foundation 3 Shed structure 4 Expanded structure 13 Ceiling of anchored structure 33 Floor of shed structure 36 Back room 41 Floor for expanded structure G Ground

Claims (8)

[Claims] 1. A fixing structure having a ceiling portion integrally formed at an upper end portion, and a lower end portion fixed to an installation ground through a foundation portion, and an upper surface covered with a roofing material to ascend and descend as a whole. A roofing structure that is integrated so as to withstand conveyance and has a lower end portion detachably connected to an upper end portion of the fixing structure, and the fixing structure and its base portion have two or more stories. A building structure characterized by being formed so as to have a strength corresponding to that of the structure. 2. The building structure according to claim 1, wherein a ceiling portion of the anchoring structure is integrally formed in advance with a floor portion of the floor-extending structure for increasing the number of floors in the future. object. 3. The structure according to claim 1, wherein the shed structure has a floor at the lower end and a shed interior is formed inside, and the anchoring structure and its foundation have three or more stories. A building structure formed to have strength corresponding to. 4. The building structure according to claim 3, wherein the floor portion of the shed structure is reinforced so that the shed structure as a whole can endure up-and-down transportation. 5. The building structure according to claim 1, wherein each structure is formed by a frame wall structure. 6. The entire upper surface of the fixing structure, the lower end of which is fixed to the installation ground through the foundation, and the ceiling of which is integrally attached to the upper end, is covered with a roof material on the upper surface. A method for increasing the number of floors by one or more with respect to an existing building structure in which the lower end of the roof structure structure integrated as a unit is detachably connected. The base portion is formed in advance so as to have a strength corresponding to at least the increasing number of layers, and first, a separating step of separating the roof structure from the upper end portion of the fixing structure is performed, and then the fixing is performed. An expansion process is carried out to build one or more floors of upstory structure above the structure, and finally, the above-mentioned separated roof structure is installed on this upstory structure to connect them to each other. Specializing in carrying out a hut group connection process Construction method of building structures to be. 7. The method for constructing a building structure according to claim 6, wherein the adding step is performed in a state in which the shed structure separated by the separating step is held at a position above the fixing structure. 8. The method of building a building structure as claimed in claim 6, wherein the building with the expanded floor structure is built in the adding step by a frame wall construction method.