JP7371296B1 - Detached houses and their renovation methods - Google Patents

Abstract

[Problem] To provide a detached house suitable for future renovation into a completely separated two-family house. SOLUTION: A detached house according to one embodiment has a first floor and a second floor, and a staircase connecting the first floor and the second floor is arranged indoors. This detached house includes an entrance with an entrance door located on the first floor, a storage space facing the exterior wall on the first floor, a foundation located below the exterior wall, and a foundation located on the foundation. . The outer wall has a door installation portion facing the storage space and having a size that allows installation of an entrance door. The area where the door is to be installed includes an area above the base that is blocked by wall material, and the base includes a fixed part located below the outer wall excluding the area where the door is to be installed, and the area below the area where the door is to be installed. and a removable portion detachably connected to the fixed portion. [Selection diagram] Figure 1

Description

TECHNICAL FIELD The present invention relates to a detached house with two or more stories and a method for renovating the same.

Many people in our country have experienced the coronavirus pandemic and have learned that temporary economic hardship can occur at some point in our lives. Many of today's houses are more than 60 years old. In the future, for example, a single-family detached house acquired in your 30s may be renovated into a two-family completely separated house after your child leaves the nest, and one household can be used for living while the other can be rented out. If utilized, it will be possible to deal with various problems such as economic hardship, lonely death, and husband's disease.

When purchasing a single-family home, a loan with a repayment period of 35 years is often taken out. However, in recent years in Japan's working environment, there is a limit to repaying the loan after 35 years of continuous work. As mentioned above, if a detached house can be renovated to completely separate two households and one household can be rented out, it can serve as insurance and risk hedge in the era of 100-year lifespans. Furthermore, it can be said that the effective use of detached houses is an activity that makes an extremely high contribution to society.

The standard one-family, two-story detached house in the world requires a large amount of money to transform into a fully separated two-family house on the first and second floors, or it may be impossible to do so in the first place. There are many. In particular, the installation of two separate entrances, ensuring flow lines from each entrance to each floor, and the presence of load-bearing walls between rooms can be obstacles.

In other words, if the entrance to the stairs connecting the 1st and 2nd floors is located in the hallway in the center of the 1st floor or near the living room on the 1st floor, the route from the entrance for the 2nd floor to the entrance after renovation will be the same as that for the 1st floor. This will obstruct the line of flow from the entrance to the living space on the first floor. Furthermore, there may be load-bearing walls or columns that include braces, braces, etc. to ensure earthquake resistance at the location where the second entrance is installed on the exterior wall or along the route from the entrance to the living space. It is difficult to remove structures that affect earthquake resistance. These are factors that will hinder future renovations of single-family homes into completely separated two-family homes.

For example, in Patent Document 1, in a two-story detached house, one entrance is provided with a width that allows two entrances to be installed, and this entrance is renovated to install two entrances, and the interior A method is shown in which a detached house can be divided into two households by appropriately arranging partitions.

However, with this method, it is necessary to prepare a wider entrance than usual from the time the detached house is newly constructed in anticipation of renovation. Therefore, the entrance space before renovation may be wasted. Additionally, in order to separate the house into two households, the original entrance would need to be removed, which raises concerns about increased renovation costs.

Patent No. 6291152

The present invention has been made in view of the above-mentioned circumstances, and one of its objects is to provide a single-family house and a method for remodeling the same that are suitable for future renovation into a two-family completely separated house. More detailed objectives will become apparent from the description herein.

The detached house according to one embodiment has a first floor and a second floor, and a staircase connecting the first floor and the second floor is arranged indoors. This detached house includes an entrance having an entrance door arranged on the first floor, a storage space arranged on the first floor and facing an outer wall of the first floor, a foundation arranged below the outer wall, and a foundation arranged below the outer wall. It has a base placed on a foundation. Furthermore, the outer wall has a door installation portion facing the storage space and having a size that allows installation of an entrance door. The planned door installation area includes an area above the base that is blocked by a wall material, and the base includes a fixed part located below the outer wall excluding the planned door installation area, and the planned door installation area. a removable part located below the fixed part and detachably connected to the fixed part.

For example, the planned door installation area is an area surrounded by an opening reinforcing material and closed by a wall material.

The detached house may further include a pair of pillar members connected to the foundation, and a horizontal frame member connected to the pair of pillar members. In this case, the planned door installation portion may be an area surrounded by the base, the pair of pillar members, and the horizontal member, and closed by a wall material.

A convex portion may be provided at each end of the fixed portion and the removable portion, and these convex portions may be stacked vertically, and the fixed portion and the removable portion may be connected by a connecting member.

The door may further include a removable reinforcing member that traverses the planned door installation area and is detachably connected to at least one of the base, the pair of pillar members, and the horizontal member.

The storage space may be provided in a room adjacent to the entrance or under the stairs.

The renovation method according to one embodiment is a method of renovating the detached house, which includes removing the portion of the outer wall where the door is scheduled to be installed, removing the removable portion of the foundation, and removing the portion where the door is scheduled to be installed. This includes installing a new entrance door in the opening created by the accident, and converting the storage space into a new entrance floor.

According to another aspect, the detached house before renovation includes a non-load-bearing wall that partitions the storage space from a hall adjacent to the entrance floor inside the entrance, and the renovation method includes removing the non-load-bearing wall, The method further includes installing an additional wall at a location that was an entrance to the storage space. According to still another aspect, in the single-family house before renovation, a first flow line connecting one of the entrance and the storage space to the top of the stairs does not divide the living space on the first floor and connects the other. The second flow line connecting the living spaces on the first floor is configured so as not to intersect the first flow line, and the renovation method is configured such that the first flow line and the second flow line are spatially separated. , installing an additional wall inside the first floor.

According to the present invention, it is possible to provide a single-family home suitable for future renovation into a two-family completely separated home, and a method for renovating the same.

If it is possible to completely separate two households through renovation, it would be advantageous in situations such as those exemplified below. Note that the following examples do not necessarily mean that the present invention exhibits these effects at the same time.
(1) After purchasing a house, the wife is in financial trouble due to her husband's sudden death, has no children, and does not want to leave the area where she is accustomed to living. Furthermore, if you still have a mortgage loan remaining, and if you sell your house and there is no home left to live in and the remaining debt remains, we will renovate the house to completely separate the two households, using one household for their own living and one for the other household. By renting out your home, you can earn rental income while securing your own home.
(2) If your child becomes independent but needs to retire earlier than expected, or if your employer goes bankrupt and you find yourself in financial hardship, you can take the same steps as in (1) above.
(3) If you are unable to work due to illness before retirement and find yourself in financial hardship, you can take the same measures as in (1) above.
(4) If your income decreases due to an unexpected event such as the coronavirus pandemic, you can respond in the same way as in (1) above.
(5) Even if there is insufficient funds for retirement, the same measures as in (1) above can be taken. Currently, the actual income of elderly people living alone is around 130,000 yen, and it is necessary to compensate for the shortfall in living costs that cannot be covered by pensions.
(6) If an elderly landlord lives in one household and rents out space for another household, the landlord is less likely to die alone.
(7) After retirement or when a couple wants to temporarily distance themselves from each other, it is possible for the couple to live separately on the first and second floors of the home, thereby avoiding divorce and husband's disease.
(8) Be able to respond to various changes in family structure in the future.
(9) From the perspective of earthquake resistance, there is no need to remove load-bearing walls during renovation, so it is safe.
(10) A house where two households can be completely separated has an increased economic value and may be sold at a high price in the future.
(11) When renting out units for two households separately, even in the same building, a 1LDK x 2 unit for 2 households will generate more rental income and a higher yield than a 4LDK unit for 1 household. This increases the value of the property as a real estate property. A 1LDK can be lived in by both a couple and a single person.
(12) Less capital is invested in the rental business, and investment efficiency is high.
(13) Demand for housing is particularly high in urban areas such as Tokyo's 23 wards, and rentals that completely separate two households are effective.
(14) Most houses these days are kept for more than 60 years. Therefore, by completely separating the two households, the residence can be effectively used after raising children or after the death of a spouse, and it has significant asset value.
(15) Gain a sense of financial security for the future. The detached house according to the present invention is a 100-year insurance policy and serves as a risk hedge.
(16) In the future, a detached house in which two households can be completely separated as in the present invention may become a standard two-story detached 4LDK house.
(17) When renovating a detached house according to the present invention into a two-family completely separated house, there is no need for extensions such as installing external stairs, and the space of the existing entrance and staircase room at the time of new construction can be used. , which is advantageous in terms of cost. Furthermore, the integrity of the building will not be compromised and its aesthetic appearance will be maintained after the renovation.
(18) Since no extension is required, there is no change in floor area ratio or building area ratio before and after renovation.
(19) For example, a spacious 1LDK of 50 to 60 m2 can be lived in by a couple or alone, making it a rare rental property. However, large 1LDKs have low yields, so they are not often newly built. Therefore, if two households are completely separated and one LDK is rented out as one household, it is expected that the vacancy rate will decrease as renters will be easier to find due to the scarcity of housing. Such properties also have less risk for the rental business.
(20) Less invested capital is required for rental, which improves investment efficiency and reduces operating expenses. While the surface yield of a one-room operation in the city center (for example, an investment of 24 million yen and a monthly income of 100,000 yen - management fees, reserve for repairs, and fixed asset tax) is around 5%, management costs and reserves for repairs are unnecessary. 1LDK rental management where two households are completely separated (for example, an investment of 4 million to 7 million yen and an income of 80,000 to 150,000 yen - repair expenses such as painting the exterior walls) has a high surface yield of about 14% to 45%. Furthermore, since it is a detached house, the property tax will not change before and after the renovation.
(21) By simulating the rental income of a property after renovation, it is possible to know the future financial plan at the time of construction and to foresee the future household finances. If you incorporate rental income into your 35-year mortgage repayment plan after your children leave the family, you may be able to repay your loan smoothly.

FIG. 1 is a schematic plan view showing the structure of the first floor of a detached house according to Application Example 1 (a) before renovation and (b) after renovation. FIG. 2 is a schematic plan view showing the structure of the second floor of the detached house shown in FIG. 1 (a) before renovation and (b) after renovation. FIG. 3 is a schematic plan view showing the structure of the first floor of a detached house according to a modified example (a) before renovation and (b) after renovation. FIG. 4 is a schematic plan view showing the structure of the second floor of a detached house according to a modified example (a) before renovation and (b) after renovation. FIG. 5 is a schematic plan view showing the structure of the first floor of a detached house according to Application Example 2 (a) before renovation and (b) after renovation. FIG. 6 is a schematic plan view showing the structure of the first floor of a detached house according to Application Example 3 (a) before renovation and (b) after renovation. FIG. 7 is a schematic plan view showing the structure of the second floor of the detached house shown in FIG. 6 (a) before renovation and (b) after renovation. FIG. 8 is a schematic plan view showing the structure of the first floor of a detached house according to Application Example 4 (a) before renovation and (b) after renovation. FIG. 9 is a schematic plan view showing the structure of the second floor of the detached house shown in FIG. 8 (a) before renovation and (b) after renovation. FIG. 10 is a schematic front view of the entrance and door installation area of a detached house before renovation according to Specific Example 1. FIG. 11 is a schematic perspective view showing an example of an underfloor structure that can be applied when the detached house is made of wood. FIG. 12 is a schematic front view of the entrance of the detached house according to Specific Example 1 after the remodeling into a two-family completely separated house. FIG. 13 is a schematic cross-sectional view showing an example of an entrance door and its vicinity. FIG. 14 is a schematic cross-sectional view showing another example of an entrance door and its vicinity. FIG. 15 is a schematic front view of the entrance and door installation area of a detached house before renovation according to Specific Example 2. FIG. 16 is a schematic front view of the entrance and door installation area of a detached house before renovation according to Specific Example 3. FIG. 17 is a schematic front view of the entrance of a single-family house according to Specific Example 3 after being remodeled into a two-family completely separated house. FIG. 18 is a schematic cross-sectional view showing an example of an entrance door and its vicinity. FIG. 19 is a schematic cross-sectional view showing a structure according to specific example 4. FIG. 20 is a schematic front view of the entrance and door installation area of a detached house before renovation according to Example 5. FIG. 21 is a schematic front view of the entrance of a detached house according to Specific Example 5 after renovation to a two-family completely separated house.

Hereinafter, some embodiments of the present invention will be described with reference to the drawings.
The detached house according to the present invention and the renovation method for converting the house into a two-family completely separated house can be applied to a standard two-story detached wooden or steel-framed 4LDK house (for example, 35 to 40 tsubo). can. However, the detached house and its renovation method according to the present invention can also be applied to houses with three or more floors, or houses with a floor plan different from a 4LDK.

[Example 1 of application to detached houses]
FIG. 1 is a schematic plan view showing the structure of the first floor of a detached house 1A according to Application Example 1 (a) before renovation and (b) after renovation. FIG. 2 is a schematic plan view showing the structure of the second floor of the detached house 1A shown in FIG. 1 (a) before renovation and (b) after renovation.

In Figures 1 and 2, the part indicated by the thick line is the load-bearing wall, the part indicated by the diagonal line upward to the right is the wall scheduled to be removed when the house is renovated into a two-family completely separated house, and the part indicated by the diagonal line upward to the left is the This is an additional wall when the house was renovated into a completely separated house.

Here, the load-bearing wall is a wall that has a function of resisting force mainly in the horizontal direction, and is, for example, a wall that includes horizontal reinforcing materials such as braces and braces. Further, the wall to be removed is a wall that, even if removed, would satisfy the predetermined building standards of the detached house 1A, and in one example is a non-load-bearing wall that does not include braces or braces.

The above-mentioned building standard is, for example, the new seismic standard specified by the Building Standards Act, but it may be a higher standard that is arbitrarily specified, or it may be a building standard specified by other laws and regulations. For example, when designing a detached house 1A, the structure of the entire detached house 1A is calculated assuming that there are no walls to be removed, and the seismic resistance is evaluated. As a result, even after the wall scheduled for removal is removed, the entire detached house 1A will meet the above building standards.

As shown in Figure 1(a), the first floor of detached house 1A before renovation consists of entrance E1, hall HL1, living-dining-kitchen LDK1, Japanese-style room JR, closet JC, storeroom SR1, bathroom BR1, washroom PR1, and toilet WC1. is located inside the outer wall 10.

The entrance E1 is provided with an entrance door D1. On the inside of the entrance door D1, an entrance floor F1 (portion with a grid pattern) made of, for example, tiles is provided, and a shoe rack S1 is arranged on the entrance floor F1.

The hall HL1 has a floor made of, for example, flooring, and is adjacent to the entrance floor F1. The entrance of the staircase ST is located in the hall HL1. Stairs ST are arranged along the outer wall 10. The storeroom SR1 is provided below the stairs ST.

The living-dining-kitchen LDK1 and toilet WC1 can be entered and exited through an entrance provided in the hall HL1. Furthermore, the entrance to the bathroom PR1 is provided in the living room, dining kitchen, and LDK1, and the entrance to the bathroom BR1 is provided in the bathroom PR1. The washroom PR1 includes, for example, a washstand and a washing machine storage area.

The entrance to the JR Japanese-style room is located in the living-dining-kitchen LDK1. Closet JC (space marked with a dot) is attached to the Japanese-style room JR. The closet JC is arranged so as to extend into the hall HL1, and is adjacent to the entrance floor F1 via a load-bearing wall. Furthermore, the closet JC faces the outer wall 10.

A portion of the outer wall 10 facing the closet JC is provided with a door installation portion 11, which is one aspect of the wall scheduled to be removed. The door installation planned portion 11 has a size that allows installation of an entrance door D2, which will be described later. Further, a part of the inner wall facing the closet JC is constituted by an L-shaped wall to be removed 12a in plan view.

As shown in Figure 2(a), the second floor of the detached house 1A before renovation consists of a hall HL2 where the exit of the staircase ST is located, three bedrooms BD1 to BD3, and closets provided in these bedrooms BD1 to BD3. It has CL1 to CL3, a storeroom SR2, and a toilet WC2 inside the outer wall 20. Bedrooms BD1 to BD3, storeroom SR2, and toilet WC2 can be accessed through an entrance provided in hall HL2.

In the example of FIG. 2(a), bedrooms BD2 and BD2 are separated by a wall 22a scheduled for removal. Further, a part of the inner wall between the closet CL3 of the bedroom BD3 and the hall HL2 is constituted by the wall 22b scheduled for removal.

When renovating the detached house 1A into a two-family completely separated house, the door installation portion 11 and the wall 12a to be removed shown in FIG. 1(a) are removed. Furthermore, as shown in FIG. 1(b), the closet JC is renovated to the entrance floor F2 (the part with the grid pattern) of the entrance E2. The entrance door D2 of the entrance E2 is installed at the location where the planned door installation section 11 was located.

Further, an additional wall 13a is installed at the location that was the entrance (sliding door) of the closet JC, and an additional wall 13b is installed to separate the entrance floors F1 and F2. The additional wall 13b is bent in a zigzag manner in a plan view, and a shoe rack S2 for the entrance E2 is arranged facing a part of the additional wall 13b.

In the example of FIG. 1(b), the additional wall 13b is connected to the indoor side wall of the stairs ST. The additional wall 13b separates a part of the hall HL1 before the renovation into a hall HL3 connected to the entrance floor F2. Furthermore, a space including the entrance floor F1, hall HL1, and stairs ST is completely partitioned from a space including the entrance floor F2 and hall HL3.

On the other hand, regarding the second floor, as shown in FIG. 2(b), the walls 22a and 22b scheduled for removal are removed, and an additional wall 23a is installed in the hall HL2. Furthermore, the door of the closet CL3 is removed, and an additional wall 23b is installed in that area.

By removing the wall 22a scheduled for removal, bedrooms BD2 and BD3 are connected, and the living-dining-kitchen LDK2 on the second floor is renovated. The additional wall 23a is placed between the entrances of the bedrooms BD2 and BD3 before renovation.

In the example of FIG. 2(b), storeroom SR2 has been renovated into a washing machine storage area. Furthermore, the closet CL3 has been renovated into a bathroom BR2, and the space next to the bathroom BR2 has been renovated into a washroom PR2.

As shown in FIGS. 1(a) and 1(b), a lifeline pipe P to the second floor has been installed in the detached house 1A since it was newly built. In the examples of FIGS. 1(a) and 1(b), the lifeline pipe P is located in the washroom PR1, but the present invention is not limited to this example.

The lifeline pipes P include pipes for water, sewage, gas, and the like. This lifeline pipe P is installed under the floor of the 2nd floor, etc., to the existing 2nd floor water area (toilet WC2, etc.) at the time of new construction, and to the water area expected to be installed at the time of renovation (planned location of kitchen stand, etc.) The planned installation position of the bathroom BR2, the planned installation position of the washroom PR2, the planned installation position of the washing machine storage area, etc.) are branched. The holes necessary for piping to the assumed water area may be formed during new construction. By using this lifeline pipe P and holes during renovation, piping work to the expected water area can be carried out twice at low cost. Further, there is no need to add piping along the outer surfaces of the outer walls 10 and 20, and the aesthetic appearance of the detached house 1A is also maintained.

A portion where a ventilation fan or a window is to be installed may be formed on the outer wall 20 facing areas that require ventilation after renovation, such as the bathroom BR2 and the kitchen. It is preferable that such a planned installation part has a structure in which it is provided in a position avoiding pillars and braces and can be easily opened.

Considering that two families will be living in single-family house 1A after renovation, it is recommended to apply anti-vibration and soundproofing measures to the stairs ST and the second floor floor from the time of new construction to prevent sound from leaking from the second floor to the first floor. preferable.

For buildings less than ^200m2 , a 90cm evacuation route must be provided, and for buildings larger than ^200m2 , a 1.5m evacuation route must be provided around the entrance. In the example of FIG. 1B, if such an evacuation passage is secured for the existing entrance E1, the same evacuation passage can also be used for the additional entrance E2 adjacent to the entrance E1. In addition, when the entrance E2 is provided in a position that is not adjacent to the entrance E1, it is necessary to design the detached house 1A including the planned door installation part 11 in advance so that an evacuation route from the entrance E2 can be secured.

The above-described configurations regarding the lifeline pipe P, the formation of the planned installation area for ventilation fans and windows, anti-vibration/soundproofing measures, and evacuation passages are similarly applied to detached houses according to modified examples and other application examples described later.

In the examples shown in Figures 1(b) and 2(b), a two-family completely separated house is realized in which the living space on the first floor and the living space on the second floor are completely separated (not connected indoors). . Here, the living space on the first floor means a space including a living-dining-kitchen LDK1, a Japanese-style room JR, a storeroom SR1, a bathroom BR1, a washroom PR1, a toilet WC1, and the like. Furthermore, the living space on the second floor means a space including a living/dining/kitchen LDK2, a bedroom BD1, a storeroom SR2, a bathroom BR2, a washroom PR2, a toilet WC2, and the like.

The entrance E1 is for the second floor, and the entrance E2 is for the first floor. As shown in Figure 1(b), on the first floor after the renovation, there is a flow line L1 from the entrance E1 to the top of the stairs ST (flow line to the living space on the second floor), and a flow line from the entrance E2 to the first floor. A flow line L2 to the living space is secured. These flow lines L1 and L2 are completely separated spatially by inner walls such as load-bearing walls and additional walls 13b from the time of new construction.

In order to make it possible to remodel a two-family completely separated house using the existing entrance, it is necessary to design the detached house with consideration to the flow lines from the two entrances to each living space after the renovation. . Specifically, the first flow line that connects one side of the entrance before the renovation and the storage space that will become an additional entrance after the renovation to the top of the stairs will not divide the living space on the first floor, and will not separate the living space from the other and the living space on the first floor. It must be constructed so that the second flow line connecting the spaces does not intersect with the first flow line.

In the example of FIG. 1(a), the flow line L1 (first flow line) connecting the entrance E1 and the top of the stairs ST does not divide the living space on the first floor. Furthermore, the flow line L2 (second flow line) connecting the closet JC (storage space) and the living space on the first floor does not intersect with the flow line L1. Thereby, the flow lines L1 and L2 can be utilized as flow lines to the first floor and the second floor, respectively, as shown in FIG. 1(b), and the number of indoor renovations can be kept to a small number. Furthermore, the entrance E1 from the time of the new construction can be used as the entrance for one of the two households even after the renovation. Note that the flow line L2 shown in FIG. 1(a) is a flow line formed when there is no wall 12a scheduled for removal of the closet JC.

The structure of the detached house 1A before and after renovation is not limited to that shown in FIGS. 1 and 2. Some modified examples are shown below.
FIG. 3 is a schematic plan view showing the structure of the first floor of a detached house 1A according to a modified example (a) before renovation and (b) after renovation. In this modification, the depth of the closet JC before renovation is larger than the example in FIG. 1. For example, the depth of a typical closet is about 900 mm, but the depth of the closet JC shown in FIG. 3(a) is 1200 mm or more. By converting this closet JC into an entrance E2 as in the example of FIG. 1, it is possible to secure an entrance floor F2 with sufficient width.

FIG. 4 is a schematic plan view showing the structure of the second floor of a detached house 1A according to a modified example (a) before renovation and (b) after renovation. In this modification, the toilet WC2 has been placed in the position that was the storeroom SR2 in FIG. 2 before the renovation, and the storeroom SR2 is placed in the position that was the toilet WC2 in FIG. By renovating the second floor of such a structure in the same way as the example in Figure 2, the water areas on the second floor (toilet WC2, kitchen counter, bathroom BR2, washroom PR2, etc.) will be placed adjacent to each other. , piping using the lifeline pipe P becomes easy.

[Example 2 of application to detached houses]
FIG. 5 is a schematic plan view showing the structure of the first floor of the detached house 1B according to Application Example 2 (a) before renovation and (b) after renovation. The floor plan of the first floor of the detached house 1B is the same as that of the detached house 1A. Furthermore, the same floor plan as the second floor of the detached house 1A can be applied to the second floor of the detached house 1B, and the structure before and after the renovation is the same as, for example, in FIGS. 2 and 4.

In the example of FIG. 5A, a door installation planned portion 11 is provided in a portion of the outer wall 10 facing the storeroom SR1 (the space marked with a dot). The storeroom SR1 is located below the stairs ST and has sufficient height for people to pass through.

As shown in FIG. 5(b), when renovating the detached house 1B into a two-family completely separated house, the planned door installation portion 11 is removed. Further, the door of the storeroom SR1 is removed, and the storeroom SR1 is renovated into the entrance floor F2 (the part with the grid pattern) of the entrance E2. The entrance door D2 of the entrance E2 is installed in the door installation planned section 11. Although not shown in FIG. 5(b), a shoe rack is also arranged on the entrance floor F2.

Further, an additional wall 13c is installed near the top of the stairs ST. This additional wall 13c separates a part of the hall HL1 before the renovation into a hall HL3 connected to the entrance floor F2. Furthermore, the flow line L1 from the entrance E1 to the top of the stairs ST (flow line to the living space on the second floor) and the flow line L2 from the entrance E2 to the living space on the first floor are spatially separated by the additional wall 13c. Completely separated.

In the example of FIG. 1, the entrance door D2 is installed on the outer wall 10 facing in the same direction as the entrance door D1. On the other hand, in the example of FIG. 5, the entrance door D2 is installed on the outer wall 10 facing in a different direction from the entrance door D1. In the example of FIG. 5 as well, a space with a width suitable for the above-mentioned evacuation passage is secured in advance outside the planned door installation section 11.

Similarly to the example of FIG. 1(a), also in the example of FIG. 5(a), the flow line L1 (first flow line) connecting the entrance E1 and the top of the stairs ST does not divide the living space on the first floor. Furthermore, the flow line L2 (second flow line) connecting the storeroom SR1 (storage space) and the living space on the first floor does not intersect with the flow line L1. Thereby, the flow lines L1 and L2 can be utilized as flow lines to the first floor and the second floor, respectively, as shown in FIG. 5(b), and the number of indoor renovations can be kept small. Furthermore, the entrance E1 from the time of the new construction can be used as the entrance for one of the two households even after the renovation.

[Example 3 of application to detached houses]
FIG. 6 is a schematic plan view showing the structure of the first floor of a detached house 1C according to Application Example 3 (a) before renovation and (b) after renovation. FIG. 7 is a schematic plan view showing the structure of the second floor of the detached house 1C shown in FIG. 6 (a) before renovation and (b) after renovation.

As shown in FIG. 6(a), the first floor of the detached house 1C before renovation has an entrance E1, a hall HL1, a living-dining-kitchen LDK1, a Japanese-style room JR, a closet JC, a bathroom BR1, a washroom PR1, and a toilet WC1. It has inside.

An entrance door D1 is provided at the entrance E1, and an entrance floor F1 (portion with a lattice pattern) is provided inside the entrance door D1. A shoe rack S1 is arranged on the entrance floor F1. The entrance of the staircase ST is located in the hall HL1. Stairs ST are arranged along the outer wall 10.

The closet JC faces a portion of the outer wall 10 that protrudes upward in the figure from a portion where the entrance door D1 is provided. A door installation portion 11 is provided in a portion of the outer wall 10 facing the closet JC (a portion constituting the back surface of the closet JC).

As shown in FIG. 7(a), the second floor of the detached house 1C before renovation includes a hall HL2 where the exit of the staircase ST is located, three bedrooms BD1 to BD3, and closets provided in these bedrooms BD1 to BD3. It has CL1 to CL3, a storeroom SR2, and a toilet WC2 inside the outer wall 20. In the example of FIG. 7A, the closet CL3 and the hall HL2 are separated by a wall 22c scheduled for removal.

When renovating the detached house 1C into a two-family completely separated house, the door installation planned portion 11 is removed and the entrance door D2 of the entrance E2 is installed, as in the example of FIG. Furthermore, the closet JC will be renovated into the entrance floor F2 (the part with the grid pattern) of the entrance E2.

In the example of FIG. 6(b), an L-shaped additional wall 13d is installed near the entrance floor F2, and a part of the Japanese-style room JR is renovated into a hall HL3 connected to the entrance floor F2. Furthermore, an additional wall 13e is installed between the Japanese-style room JR and the living-dining-kitchen LDK1, and an entrance is installed that connects the Japanese-style room JR and the living-dining-kitchen LDK1 to the hall HL3.

Further, an additional wall 13f is installed near the stairs ST. As a result, a space including the entrance floor F1, hall HL1, and stairs ST is completely partitioned from the living space on the first floor.

On the other hand, regarding the second floor, as shown in FIG. 7(b), the wall 22c scheduled for removal is removed, and additional walls 23c and 23d are installed in the space that was the bedroom BD3 before the renovation. Furthermore, the space that was the bedroom BD3 and the closet CL3 before the renovation has been renovated into a storage room SR3, bathroom BR2, and washroom PR2.

Furthermore, in the example of FIG. 7(b), the space that was the bedroom BD2 has been renovated into the dining kitchen DK, and a kitchen table has been placed in the space that was the closet CL2.

Similarly to the example of FIG. 1(a), also in the example of FIG. 6(a), the flow line L1 (first flow line) connecting the entrance E1 and the top of the stairs ST does not divide the living space on the first floor. Furthermore, the flow line L2 (second flow line) connecting the closet JC (storage space) and the living space on the first floor does not intersect with the flow line L1. Thereby, the flow lines L1 and L2 can be used as flow lines to the first floor and the second floor, respectively, as shown in FIG. 6(b), and the number of indoor renovations can be kept small. Furthermore, the entrance E1 from the time of the new construction can be used as the entrance for one of the two households even after the renovation.

[Example 4 of application to detached houses]
FIG. 8 is a schematic plan view showing the structure of the first floor of the detached house 1D according to Application Example 4 (a) before renovation and (b) after renovation. FIG. 9 is a schematic plan view showing the structure of the second floor of the detached house 1D shown in FIG. 8 (a) before renovation and (b) after renovation.

As shown in FIG. 8(a), the first floor of the detached house 1D before renovation consists of an entrance E1, a hall HL1, a living-dining-kitchen LDK1, a multipurpose housekeeping room HR, storage rooms SR1 and SR2, a bathroom BR1, a washroom PR1, and A toilet WC1 is provided inside the outer wall 10.

An entrance door D1 is provided at the entrance E1, and an entrance floor F1 (portion with a lattice pattern) is provided inside the entrance door D1. A shoe rack S1 is arranged on the entrance floor F1. The entrance of the staircase ST is located in the hall HL1. Stairs ST are arranged along the outer wall 10.

The entrance to the living-dining-kitchen LDK1 is provided in the hall HL1. The entrance to the housekeeping room HR and washroom PR1 is provided in the living-dining-kitchen LDK1. The entrance to the storeroom SR1 and the bathroom BR1 is provided in the washroom PR1.

An entrance to the storeroom SR2 is provided in the hall HL1. The storeroom SR2 faces the outer wall 10 near the top of the stairs ST. A door installation planned portion 11 is provided in a portion of the outer wall 10 facing the storeroom SR2 (a portion constituting the back surface of the storeroom SR2). Further, a part of the inner wall between the hall HL1 and the storeroom SR2 is constituted by a wall 12b scheduled for removal.

As shown in FIG. 9(a), the second floor of the detached house 1D before renovation includes a hall HL2 where the exit of the staircase ST is located, three bedrooms BD1 to BD3, and closets provided in these bedrooms BD1 to BD3. It has CL1 to CL3 and a toilet WC2 inside the outer wall 20. In the example of FIG. 9A, two closets CL3 are provided in the bedroom BD3, and these closets CL3 are partitioned by a wall to be removed 22d.

When renovating a detached house 1D into a two-family completely separated house, the part 11 where the door was to be installed is removed, as in the example in Figure 1, and the part where the door was to be installed is replaced as shown in Figure 8(b). The entrance door D2 of the entrance E2 is installed. Furthermore, the storeroom SR2 is renovated into the entrance floor F2 (the part with the grid pattern) of the entrance E2.

Furthermore, the wall scheduled for removal 12b is removed, and an additional wall 13g is installed in the hall HL1. As a result, part of the space that was hall HL1 before the renovation has been renovated into hall HL3, which connects to entrance floor F2.

In the example of FIG. 8(b), additional walls 13h and 13i are installed in the space that used to be the living-dining-kitchen LDK1. As a result, a bedroom BD is formed in a part of the space that used to be the living-dining-kitchen LDK1.

On the second floor, on the other hand, as shown in Figure 9(b), the wall 22d scheduled for removal has been removed, the space that was the bedroom BD3 before the renovation was renovated into the dining kitchen DK, and the space that was the closet CL3 has been renovated. A kitchen table is placed in the room.

Further, additional walls 23e and 23f are installed in the space that was the bedroom BD2, and the space that was the bedroom BD3 and the space that was the closet CL3 have been renovated into a storeroom SR3, a bathroom BR2, and a washroom PR2.

In the example of FIG. 8A, the flow line L1 (second flow line) connecting the entrance E1 and the living space on the first floor does not divide the living space on the first floor. Furthermore, the flow line L2 (first flow line) connecting the storeroom SR2 (storage space) and the top of the stairs ST does not intersect with the flow line L1. Thereby, the flow lines L1 and L2 can be used as flow lines to the first floor and the second floor, respectively, as shown in FIG. 8(b), and the number of indoor renovations can be kept small. Furthermore, the entrance E1 from the time of the new construction can be used as the entrance for one of the two households even after the renovation. Note that the living space on the first floor in the detached house 1D means a space including a living room, dining room, and kitchen LDK1, a bathroom BR1, a washroom PR1, a toilet WC1, and the like.

In application examples 1 to 4 explained above, storage space (closet or storeroom) is used as an additional entrance floor when the house is remodeled into a two-family completely separated house. If space is to be secured for adding an entrance to hall HL1 etc., there is a possibility that the space cannot be used effectively before the renovation. In contrast, by preparing a storage space that can be used as a place for installing an additional entrance floor from the time of new construction (design) of a detached house, it is possible to effectively utilize the space for adding an entrance floor even before renovation. I can do it. Even if the renovation is not done, the space will not be wasted. In addition, the door installation planned part 11 may be provided in a room other than the storage space (for example, a living room such as a Japanese-style room JR of the detached house 1A). In this case, the Japanese-style JR room will be renovated as the entrance floor during the renovation.

Next, we will explain some specific examples of structures for adding an entrance when renovating a two-family completely separated house. In each specific example, the structure around the entrance E1 and the planned door installation part 11 will be illustrated mainly assuming the detached house 1A shown in FIG. 1, but the same structure can be applied to other detached houses.

[Specific example of adding an entrance 1]
FIG. 10 is a schematic front view of the entrance E1 and the scheduled door installation portion 11 of the detached house 1A before renovation according to the first example. In this figure, the wall materials constituting the wall surface of the load-bearing wall are omitted, and the structure inside the wall is also shown.

The detached house 1A includes a foundation 1 made of concrete. A foundation packing 2 is placed on the foundation 1, and a foundation 3 extending in the horizontal direction is placed on the foundation packing 2.

A large number of pillar members 40 extending in the vertical direction are arranged on the base 3. These pillar materials 40 include main pillars and studs that are thinner than the main pillars. In addition, in a steel-framed house, the pillar material 40 corresponding to a stud is called a stud. Horizontal members 41 are arranged in places between two adjacent pillar members 40. In a steel-framed house, an element corresponding to the horizontal member 41 is called a runner.

A beam member 5 extending in the horizontal direction is arranged on each pillar member 40. In most of the outer walls 10 that do not have openings, horizontal reinforcing members 60 are arranged in areas surrounded by the foundations 3, pillars 40, horizontal members 41, beams 5, and the like. The horizontal reinforcing member 60 is, for example, a brace used in a wooden house or a brace used in a steel frame house, and has the role of suppressing horizontal deformation of the house. A portion including such horizontal reinforcing material 60 corresponds to the above-mentioned load-bearing wall.

The base 3, the pillar members 40, the horizontal members 41, the beam members 5, and the horizontal reinforcing members 60 are connected to each other. For example, the foundation 3, columns 40, horizontal members 41, and beams 5 are all made of wood if the detached house 1A is made of wood, and if the detached house 1A is made of steel, all of them are made of steel. be.

In the example of FIG. 10, the entrance door D1 is arranged in an area surrounded by a pair of adjacent pillar members 40 and horizontal members 41. An opening reinforcing material RM1 is arranged inside this region, a base material BM1 is arranged inside the opening reinforcing material RM1, and a door frame FM1 is arranged inside the base material BM1. In the example of FIG. 10, the base 3 is partially removed below the entrance door D1. Further, a pouch P1 is arranged below the outside of the entrance door D1.

The planned door installation portion 11 is formed in an area surrounded by the base 3, a pair of pillars 40, and a horizontal member 41 connecting these pillars 40. This area is closed off by a wall material 7 made of gypsum board, plywood, heat insulating material, or the like. The door installation planned portion 11 has a width and height that allows the entrance door D2 to be installed at the time of renovation. In one example, the width of the planned door installation section 11 is 800 mm or more, and the height of the planned door installation section 11 is 2000 mm or more. Note that the width of a typical entrance door is 800 to 820 mm, and the height is 2000 to 2400 mm.

In the example of FIG. 10, the base 3 has a fixed part 30 (fixed base) and a removable part 31 (removable base) that are separated from each other. The fixed portion 30 is located below the outer wall 10 excluding the portion 11 where the door is to be installed. The removable portion 31 is located below the scheduled door installation portion 11 and is detachably connected to the fixed portion 30. The scheduled door installation portion 11 can also be defined as a portion of the outer wall 10 located above the removable portion 31.

The fixed part 30 and the removable part 31 are both connected to the foundation 1 by anchor bolts. In FIG. 10, two anchor bolts 8 connecting the removable portion 31 to the foundation 1 are illustrated. For example, the distance between these anchor bolts 8 is within 2 m, and the anchor bolts 8 are arranged at positions approximately 15 cm from adjacent pillars 40.

In the example of FIG. 10, two removable braces 61 are installed that intersect with each other and cross the door installation area 11. Both ends of these braces 61 are removably connected to at least one of the base 3, the pillars 40, and the horizontal members 41 by metal fittings 62. By providing such a brace 61, the strength of the planned door installation portion 11 can be increased. As another example, the brace 61 may not be provided in the door installation portion 11. Further, instead of the brace 61, a wooden brace may be provided. These braces 61 and braces are examples of removable reinforcing members.

When the detached house 1A is made of wood, as shown in an enlarged view in FIG. A convex portion 31a protruding in the horizontal direction may be provided, and these convex portions 30a, 31a may be stacked vertically. Furthermore, the fixed part 30 and the removable part 31 may be connected by a plurality of connecting members 32 attached to the side surfaces thereof. With such a structure, the fixed portion 30 and the removable portion 31 can be firmly connected.

On the other hand, if the detached house 1A is a steel frame structure, as shown in an enlarged view in FIG. You can also let them touch each other.

It is preferable that the anchor bolt 8 connecting the removable part 31 to the foundation 1 does not protrude above the removable part 31. In the example of FIG. 10, a counterbore 31b is provided on the upper surface of the removable portion 31, and the head of the anchor bolt 8 (bolt tip, nut, etc.) is accommodated in the counterbore 31b.

FIG. 11 is a schematic perspective view showing an example of an underfloor structure that can be applied when the detached house 1A is made of wood. In the example shown in this figure, a plurality of floor bundles 42 are arranged inside the area surrounded by the foundation 1, and the large puller 33 is supported by these floor bundles 42. The end of the large drawer 33 is connected to the base 3. A plurality of joists 34 indicated by broken lines may be arranged on the main drawer 33.

For example, if the joist 34 is not placed, an indoor flooring material having a thickness of about 24 mm is installed on the floor joist 33. On the other hand, when the joists 34 are arranged, the flooring material is installed on the joists 34.

For example, the large drawers 33 are also arranged at positions corresponding to the pillars 40 on both sides of the door installation portion 11. These large drawers 33 extend in a direction perpendicular to the base 3 below the door installation portion 11. In addition, in FIG. 11, some pillar members 40 and the entrance E1 are omitted, and the structure does not necessarily correspond to that shown in FIG. 10.

FIG. 12 is a schematic front view of the entrances E1 and E2 of the detached house 1A after the renovation to a two-family completely separated house. During the renovation, the portion 11 where the door is to be installed (wall material 7, brace 61, etc.) is removed. Further, the removable portion 31 of the base 3 is removed from the fixed portion 30, and the convex portion 30a of the fixed portion 30 is removed. Furthermore, the foundation packing 2 located below the removable portion 31 is also removed, and the portion of the anchor bolt 8 that protrudes from the foundation 1 is cut off.

Subsequently, as shown in FIG. 12, the opening reinforcing material RM2 is placed in the opening created by removing the door installation portion 11, the base material BM2 is placed inside the opening reinforcing material RM2, and the base material BM2 is placed inside the opening reinforcing material RM2. A door frame FM2 is arranged inside BM2. Furthermore, an entrance door D2 is installed in the door frame FM2. In the example of FIG. 12, a pouch P2 is installed below the outside of the entrance door D2.

In this way, if the foundation 3 has the removable portion 31 from the beginning of the new construction of the detached house 1A, it will be extremely easy to remove a part of the foundation 3 and install the entrance door D2, The impact on earthquake resistance is also smaller than in the case where part of one continuous foundation 3 is removed during renovation. Furthermore, if the detached house 1A is designed in advance to meet earthquake-resistant building standards without considering the removable portion 31, sufficient earthquake resistance can be ensured even after renovation.

Large drawers 33 shown in FIG. 11 are arranged at positions corresponding to the pillars 40 on both sides of the door installation portion 11. As an example, the pitch at which these large drawers 33 are arranged is 900 mm, and the width of each large drawer 33 is 90 mm. In this case, the width of the door installation portion 11 for installing the entrance door D2, the opening reinforcing material RM2, the base material BM2, and the door frame FM2 is 900 mm - 90 mm = 810 mm. The present invention is not limited to this example, and by adjusting the positions of the pillars 40 and the drawers 33, it is also possible to increase the width of the planned door installation section 11.

The large pull 33 can affect the earthquake resistance of the detached house 1A, and is preferably left as is without being removed during renovation. Then, the entrance floor F2 on the inside of the entrance door D2 is formed, for example, between two adjacent large drawers 33. The width of the entrance floor F2 in this case is, for example, the above-mentioned 810 mm, but is not limited to this example. When the joists 34 shown in FIG. 11 are arranged, the joists 34 may be removed at the entrance floor F2.

FIG. 13 is a schematic cross-sectional view showing an example of the entrance door D2 and its vicinity. When installing the entrance door D2 by removing the removable portion 31 of the foundation 3 as in the example of FIG. 12, the upper surface SF1 of the foundation 1 becomes the reference for the floor surface SF2 of the entrance floor F2. The floor surface SF3 of the corridor portion of the hall HL3 is formed, for example, at a position approximately 10 cm to 15 cm higher than the floor surface SF2. In addition, if the large drawer 33 shown in FIG. 11 is arranged parallel to the base 3 below the door installation planned portion 11, the position of the large drawer 33 may be the boundary between the floor surfaces SF2 and SF3.

FIG. 14 is a schematic cross-sectional view showing another example of the entrance door D2 and its vicinity. In this example, a slope SL is formed at the boundary between floor surfaces SF2 and SF3. Thereby, a wheelchair or a handcart (such as a silver car) can be easily put into the hall HL3.

Note that the same structure as in FIG. 14 can be applied to the entrance E1 as well. That is, the slope SL may be provided at the boundary between the floor surface of the entrance floor F1 and the floor surface of the hall HL1. This slope SL may be provided from the beginning of new construction, or may be added at the time of renovation.

[Specific example 2 of adding an entrance]
FIG. 15 is a schematic front view of the entrance E1 and the planned door installation portion 11 of the detached house 1A before renovation according to the second example. In the example shown in this figure, a plurality of furring edges 63 and a plurality of studs 64 arranged in a grid are installed in the door installation area 11. The furring 63 and the studs 64 are examples of removable reinforcing members.

The furring 63 arranged parallel to the horizontal direction crosses the door installation area 11 and is connected to the left and right pillars 40. The studs 64 arranged parallel to the vertical direction cross the planned door installation portion 11 and are connected to the removable portion 31 of the base 3 and the horizontal member 41.

As shown in an enlarged view in FIG. 15, a recess 40a is formed in the side surface of the column 40. The end of the furring 63 is inserted into this recess 40a. The studs 64 are connected to the removable portion 31 and the horizontal member 41 by an appropriate method.

In this way, even when the furring 63 and the studs 64 are provided in place of the brace 61 shown in FIG. 10, the strength of the door installation portion 11 can be increased. In addition, if a trunk pierced through the pillars 40 and horizontal members 41 is installed instead of the trunk rim 63, the strength of the pillars 40 and horizontal members 41 around the planned door installation section 11 may be reduced. . On the other hand, since the furring 63 does not penetrate the column 40, the effect of providing the furring 63 on the strength of the column 40 is slight.

[Example 3 of adding an entrance]
FIG. 16 is a schematic front view of the entrance E1 and the planned door installation portion 11 of the detached house 1A before renovation according to Specific Example 3. In the example shown in this figure, the base 3 does not have a removable part 31. That is, the entire base 3 is constituted by the fixed portion 30. Furthermore, an opening reinforcing material RM2 has been installed in the door installation area 11 since the time of new construction. In this case, the scheduled door installation portion 11 can be defined as an area surrounded by the opening reinforcing material RM2. The inside of the opening reinforcing material RM2 is closed by the wall material 7. Note that, similarly to the example of FIG. 16, the opening reinforcing material RM2 may be installed from the time of new construction in the examples of FIGS. 10 and 15 described above.

Other configurations in the example of FIG. 16 are similar to those of the example of FIG. 10. However, the brace 61 may not be provided. Furthermore, instead of the brace 61, a torso 63, studs 64, or braces similar to the example of FIG. 15 may be provided.

FIG. 17 is a schematic front view of the entrances E1 and E2 of the detached house 1A after the renovation into a two-family completely separated house. In the example shown in this figure, the base material BM2, the door frame FM2, and the entrance door D2 are installed in the location where the planned door installation section 11 was, without removing the base 3.

FIG. 18 is a schematic cross-sectional view showing an example of the entrance door D2 and its vicinity. When leaving the base 3 (fixed part 30) below the entrance door D2, the standard of the floor surface SF2 of the entrance floor F2 must be located above the upper surface SF1 of the foundation 1 by the amount of the base 3 and the base packing 2. becomes. Therefore, it is preferable that the porch P2 is also formed high so that an excessively large step does not occur in the vicinity of the entrance door D2.

Furthermore, if the foundation 3 is left, there is a possibility that the floor surface SF2 of the entrance floor F2 and the floor surface SF3 of the hall HL3 will be at the same height. In this case, as shown in FIG. 18, a slope material SLM may be installed at the boundary between floor surfaces SF2 and SF3. The slope material SLM has a height of, for example, about 5 cm to 10 cm, and has slopes on the floor surface SF2 side and the floor surface SF3 side.

[Example 4 of adding an entrance]
In FIG. 1 and the like, a part of the wall around the entrance E2 has been removed due to the installation of the entrance E2. In such a case, it is not necessarily necessary to remove the entire wall from the lower end to the upper end, and a portion thereof may be removed.

FIG. 19 is a schematic cross-sectional view showing the structure when part of the wall is removed. Before the renovation, the wall 9 to be removed was placed near the part 11 to be installed with the door. The wall 9 to be removed before renovation has a first portion 91 shown with diagonal lines and a second portion 92 shown with a dashed line. The second portion 92 is located directly above the base 3. The first portion 91 is located above the second portion 92 or surrounds the second portion 92, for example. The space on the right side of the wall 9 to be removed is an area where the entrance floor F2 of the entrance E2 is installed, and the space on the left side is a room on the first floor and the existing entrance floor F1.

During renovation, the second portion 92 is removed, but the first portion 91 is left as is. That is, by removing the second portion 92, a hole is formed in the wall 9 scheduled for removal. In the example of FIG. 19, the shoe rack S2 is installed using this hole. The shoe rack S2 protrudes above the floor 101 of the room adjacent to the entrance floor F2. Note that the elements placed by utilizing the holes in the wall 9 scheduled for removal are not limited to the shoe rack S2.

[Example 5 of adding an entrance]
FIG. 20 is a schematic front view of the entrance E1 and the planned door installation portion 11 of the detached house 1A before renovation according to Example 5. Here, it is assumed that the detached house 1A is a steel frame structure.

In the example of FIG. 20, the base 3 is not provided above the foundation 1, and a metal base plate 200 is provided instead. The base plate 200 is thinner than the pillars 40 and the beams 5. A steel column 40 is fixed to the foundation 1 with anchor bolts 8.

In the example of FIG. 20, an opening reinforcing material RM2 and a brace 61 are installed in the door installation planned portion 11 before renovation. As another example, the opening reinforcing material RM2 and the brace 61 may not be provided in the door installation portion 11.

FIG. 21 is a schematic front view of the entrances E1 and E2 of the detached house 1A after it has been remodeled into a two-family completely separated house. In the example shown in this figure, the wall material 7 and the brace 61 have been removed, and the base material BM2, door frame FM2, and entrance door D2 are installed in the door installation planned portion 11.

[summary]
With the configurations illustrated above with reference to FIGS. 1 to 21, a wooden or steel-frame detached house can be renovated into a two-family completely separated house. In either example, the new entrance E2 is installed using the storage space left at the time of new construction.

After the house is renovated into a completely separated two-family home, the landlord may continue to live on one of the first or second floors and rent out the other. Alternatively, both the first and second floors may be rented out. Parents and their children's families can live on the first and second floors, or married couples can live separately.

When designing such a detached house, we simulated so that the flow lines from each entrance E1 and E2 after renovation to the living space on the first floor and the living space on the second floor would not be obstructed. 11 and the upper entrance of the stairs ST are determined. In each of the examples shown in FIGS. 1 to 9, the entrance of the stairs ST faces the outer wall 10, so it is easy to ensure a flow line. However, even if the ascending entrance is located near the center of the first floor, depending on the position and floor plan of the entrance E1 and door installation area 11, it is possible to access the living space on the first floor and the second floor from each entrance E1 and E2 after renovation. It is possible to design so that flow lines to each living space are not obstructed.

When evaluating the earthquake resistance of a detached house, we do not take into account the strength of the wall scheduled to be removed, including the part 11 where the door is scheduled to be installed. Perform structural calculations to obtain the result. If the brace 61 shown in FIG. 10 or the like is provided in the door installation area 11, the earthquake resistance can be further improved, but even if this brace 61 is removed at the time of renovation, the earthquake resistance still satisfies the building standards.

In addition, at the time of design, the floor plan of the first and second floors after renovation (for example, the location of the 1LDK room, toilet, bathroom, washroom, storage) should be assumed, and non-load-bearing walls should be placed in positions that would obstruct the line of flow. A wall will be set up that will be removed. From the perspective of reducing renovation costs, it is preferable to minimize the number of walls scheduled for removal. Naturally, the design is done with the above-mentioned evacuation route in mind.

Pre-renovation design drawings and post-renovation design drawings are created at least at the time of new construction and handed over to the building owner. When a mortgage is taken out when a new detached house is constructed, a mortgage repayment plan may be created that takes into account the rental income after the renovation. This makes the financial plan clear and allows the owner of the building to predict future household finances and smoothly repay long-term mortgages.

1A, 1B, 1C, 1D... Single-family house, 10, 20... Exterior wall, 11... Door installation area, E1, E2... Entrance, D1, D2... Entrance door, F1, F2... Entrance floor, ST... Stairs, JC... Closet (storage space).

Claims (7)

A detached house having a first floor and a second floor, and a staircase connecting the first floor and the second floor located indoors,
an entrance having an entrance door located on the first floor;
a storage space arranged on the first floor and facing an outer wall of the first floor;
a foundation placed below the outer wall;
a foundation placed on the foundation;
Equipped with
A first flow line connecting one of the entrance and the storage space to the top of the stairs does not divide the living space on the first floor, and a second flow line connecting the other and the living space on the first floor is the first flow line. It is configured so that it does not intersect with the 1 flow line,
The storage space is provided in a room adjacent to the entrance or under the stairs, or the entrance to the storage space is provided in a hall adjacent to the entrance floor inside the entrance,
The outer wall has a door installation portion facing the storage space and having a size that allows installation of an entrance door,
The planned door installation area includes an area above the base that is blocked by a wall material,
The base is
a fixed part located below the outer wall excluding the part where the door is planned to be installed;
a removable part located below the scheduled door installation part and detachably connected to the fixed part;
including,
Detached house. A convex portion is provided at each end of the fixed portion and the removable portion, and these convex portions are stacked vertically, and the fixed portion and the removable portion are connected by a connecting member.
The detached house according to claim 1. The door installation planned portion includes an area surrounded by a pair of pillars connected to the base, a horizontal member connected to the pair of pillars, and the removable part.
The detached house according to claim 1. The planned door installation portion is surrounded by an opening reinforcing material.
The detached house according to claim 1. A method for renovating a detached house according to any one of claims 1 to 4 ,
removing the portion of the outer wall where the door is planned to be installed;
removing the removable portion of the base;
Installing a new entrance door in the opening created by removing the planned door installation part and the removable part,
Renovating the storage space into a new entrance floor,
Renovation methods including. The detached house before renovation includes a non-load-bearing wall that partitions the hall and the storage space,
removing the non-load-bearing wall;
Installing an additional wall at the location that was the entrance to the storage space;
The renovation method according to claim 5 , further comprising :. The renovation method according to claim 5 , further comprising installing an additional wall inside the first floor so that the first flow line and the second flow line are spatially separated.

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