JP2006307621A - Apartment house common use structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a common part structure for an existing apartment house with improved workability while ensuring fire resistance.
An elevator housing, a corridor 7, and a connecting corridor 11 that connects the corridor 7 and each of the dwelling units 9a to 9d, is an apartment housing shared part structure 1 provided in an existing apartment house, While the beam and the pillar which comprise a structure were comprised with fireproof steel, the blow-off 17 was provided between the said corridor and opening part 15a-15d of each dwelling unit 9a-9d.
The width of the blow-through was set so as to satisfy the following formula.
Blow-through width ≧ Dwelling unit opening height × 2/3 + opening rim overhang length [selection figure]

Description

  The present invention relates to a housing complex shared part structure provided in an existing housing complex, including at least a corridor and a connecting corridor that connects the corridor and each door.

There are many existing buildings that do not have an elevator, such as an old staircase type apartment house of five stories or less. In such a building without an elevator, you must go up and down the stairs to go out, and it is very inconvenient if elderly people or people with physical disabilities live on the second floor or higher. is there.
Therefore, in recent years, there has been a proposal for making the barrier-free by installing an elevator and a horizontal corridor connecting the elevators outside an existing staircase type apartment house without such an elevator (for example, Patent Document 1). 2).
JP 2004-225473 A JP 2001-295479 A

All proposed in Patent Documents 1 and 2 are to provide an elevator, a corridor and the like outside an existing apartment house.
However, none of them mentions details regarding the fireproof structure. However, in such a building, it is common to apply a fireproof coating to the steel material that constitutes the pillars and beams that form the framework of the building.
In this regard, Patent Document 1 describes that a fireproof cover 14 is provided on the outer periphery of the steel rod 10 between the floor support members 12 as necessary (see paragraphs 4 to 6 in paragraph 17).
The reason why the fireproof coating is applied in this manner is that when the steel material is exposed to a fire, the steel material begins to lose its proof stress when the steel material temperature exceeds 300 ° C, and the strength becomes less than half at 500 ° C. This is to protect the pillars and beams. For this reason, when making an apartment building common use a steel frame, it is calculated | required to carry out a fireproof coating.

However, there is a problem that on-site fireproofing work is complicated and costly.
In addition, since most of the shared apartments are provided outside, most of the parts are exposed to rain, and the construction of the fireproof coating at the site is difficult.
Furthermore, there is a problem that the effective use area is reduced by applying the fireproof coating. If the effective use area is reduced, in other words, in order to secure the necessary effective use area, it is necessary to enlarge the collective housing shared part itself.
However, since such an apartment house has a plurality of buildings adjacent to each other, if the apartment building shared section itself installed between them is enlarged, there will be a problem of sunshine for the adjacent buildings.
Thus, the apartment house shared part structure premised on the construction of the fireproof coating has various problems such as workability.

As mentioned above, although the proposal about installing the existing apartment building common use part structure is made, examination from a viewpoint of improving workability, ensuring fire resistance, is not made.
Then, this invention aims at providing the common part structure of the existing apartment house which improved workability, ensuring fire resistance.

  As described above, the problem of the conventional apartment building common part structure (simply referred to as “common part” or “structure” in some cases) is caused by applying a fireproof coating to the pillars and beams constituting the structure. Therefore, the inventor has examined a structure in which fireproof steel is used for the pillars and beams constituting the shared apartment structure and the fireproof coating is unnecessary. Here, Fire Resistant Steel is a steel material developed for the purpose of reducing or omitting the fireproof coating necessary to ensure the fireproof performance of steel structures. This is guaranteed to be 2/3 or more of the (F value).

  The inventor examined the influence of the fire generated in the apartment building common part structure in order to configure the apartment house common part structure with fireproof steel not covered with fireproof coating. At the time of examination, first, the influence of the fire that occurred in the apartment building common use structure was examined, and then the influence of the fire that occurred in the dwelling unit on the apartment building common use structure was examined.

1) About the impact of fires that occurred in the apartment building common area structure The fires that occurred in the apartment building common part structure were examined separately for the overall fire and the local fire.
(A) Examination of the entire fire If all the interior materials of the structure of the apartment building common area are non-combustible, the amount of combustible material stored in the common area is 32 MJ / m ² from the corridor of Notification No. 1433, which is converted to wood Then, the following equation (1) is obtained.
FL = q ₁ / H ₀ = 32/18 ≒ 2kg / m ² <5kg / m ² ---------- (1)
FL: Fire load (kg / m ² )
q ₁ : Amount of combustible material (MJ / m ² )
H ₀ : Calorific value per unit weight of wood (MJ / kg)

A fire load of 5 kg / m ² or less is an empirical condition in which flashover does not occur. As can be seen from equation (1), the common part is far below the condition value.
Therefore, if the openness of the common part is sufficient, the fire can be considered as a local fire.
Therefore, when examining openness, the main use of the common part is a corridor for residents to pass through, and the possibility of placing combustibles is extremely small. In addition, the effective width of the corridor in the common area is about 1.8m, so there is limited space for combustible materials.
Thus, it is considered that the openness is sufficient in view of the use and shape of the shared portion.
Therefore, it is considered that flashover does not occur in the common part, and it can be determined that it is unnecessary to consider the entire fire.
Note that the flashover is a phenomenon in which a fire occurs in a room and a flammable gas is produced, and the flame ignites and the flame spreads in an instant.

(2) Examination of local fires For the examination of local fires, the design fire source is set, the fire properties are predicted, the temperature of the steel is predicted based on the fire properties, and the temperature of the steel is further predicted. The structure for ensuring the safety of refractory steel in the event of a local fire was investigated.

(A) Setting of design fire source We decided to use the following local fire sources that are already approved to be used in a space with relatively little combustible material. .
Local fire source-Heat generation rate: 3000kW
・ Fire source area: 1.7m ²
・ Fire duration: 20 minutes ・ Fire source top: 0.4 m

(B) Predicting fire properties Following on-axis temperature distribution and height calculation methods and results of flames and plumes, “Fire-proof design method for buildings, Volume 2” The temperature distribution on the fire source axis in (free space) was predicted. FIG. 7 shows the prediction results of fire properties.

(C) Steel material temperature prediction The steel material temperature of the column was examined using a two-dimensional finite element temperature analysis program for the minimum heat capacity section (H-200X200X8X12) of the column used in the common area.
The analysis was predicted by unsteady heat conduction analysis with respect to the amount of heat from the ambient temperature flowing in and out through the heat transfer surface set at the boundary of the model composed of two-dimensional finite elements.

・ How to determine the heating circumference by radiation When predicting the steel material temperature of a pillar, the case where the rectangular design fire source placed in the open corridor and the pillar face each other is the most severe. In that case, the heating range by radiation from the fire source is roughly divided into a positive part and a negative part as shown in FIG. 8 (a) and FIG. 8 (b). In FIGS. 8 (a) and 8 (b), the positive part is indicated by a thick line.

・ How to calculate ambient air temperature (atmosphere temperature) and form factor For the ambient air temperature (atmosphere temperature), the boundary between the intermittent flame zone and the plume zone was assumed to be approximately 300 ° C, and this was used as the ambient temperature of the members.
Further, the form factor F is divided into a case where the steel material surface and the flame surface are parallel and a case where the steel material surface and the flame surface are parallel, and a form factor when the steel material surface and the flame surface are parallel (see FIG. 9A) factor F _1. Was obtained by the following formula (3).

Further, the form of case steel surface and flame front perpendicular (see FIG. 9 (b)) factor F ₂ was determined using the following equation (4).

-Column steel temperature prediction model The column steel temperature prediction is based on the case where the flame faces the flange surface of the H-shaped steel (when the flange surface is parallel to the flame surface) and the case where the flame faces the web surface of the H-shaped steel. (The case where the web surface is parallel to the flame surface) was examined. The distance between the directly facing flame and the surface of the steel frame was secured by placing 10 cm square concrete at the base of the pillar. The temperature of the flame directly opposite was 800 ° C, and the fire duration was 20 minutes.

Based on the radiation temperature and the ambient temperature of each part of the steel material obtained based on the above concept, a temperature heat conduction analysis was performed on the minimum heat capacity cross section (H -200 X 200 X 8 X 12) of the column used in the common part. The steel material temperature prediction results at this time are shown in FIGS. 10 (a) and 10 (b).
When the flame shown in FIG. 10 (a) faces the flange surface of the H-shaped steel, the region (i) is less than 250 ° C., the region (ii) is 300 ° C. to less than 500 ° C., and the region (iii) The temperature was 500 ° C. to 563 ° C., and the maximum temperature was 563 ° C.
In the case where the flame shown in FIG. 10 (b) faces the web surface of the H-section steel, the region (iv) is 300 ° C. to 350 ° C., the region (v) is 400 ° C. to 450 ° C., (vi ) Region was 500 ° C. to 540 ° C., and the maximum temperature was 540 ° C.

As described above, when the distance between the fire source and the steel material is 10 cm, the maximum temperature when the flange faces the flame is 563 ° C., and the maximum temperature when the web faces the flame is 540 ° C. is there.
From this, it was found that the maximum temperature of the steel material can be made 600 ° C. or less by securing a distance of 10 cm between the fire source and the steel material. If it is 600 ° C. or less, the refractory steel has a proof stress of 2/3 or more of the normal temperature proof strength (F value), so it is safe as a structure.
The above is the examination result about the influence of the fire that occurred in the apartment building common part structure, but below, the influence that the fire that occurred in the dwelling unit has on the common part is examined.

2) Examination of the impact of fires in the dwelling unit on the common area When a fire occurs in the dwelling unit, it is possible that a flame blows out from the window of the dwelling unit to the common area. The effect on the beam was examined.
Here, the AISI (American Iron and Steel Institute) “Fire Safety Design for External Structural Components-Design Guide” (Fire
In the design method based on Safe Structural Steel -A Design Guide-), the temperature of the column / beam steel material parallel to the flame that is not involved in the erupting flame, and the temperature of the beam steel material perpendicular to the flame that is involved in the flame inclined by the crosswind Predicted.

The model unit was constructed with the unit area, depth, floor height, and opening as parameters within the range assumed as a housing complex.
Fig.11 (a) is explanatory drawing of division area and depth, FIG.11 (b) is explanatory drawing of division floor height.
As shown in FIG. 11A, three parameters 35m ² , 50m ² , and 80m ² are set as the partition area A _r , and two parameters 6m ² and 7m ² are set as the depth D _r . Further, as shown in FIG. 11B, two parameters 2.6 m and 2.8 m are set as the division floor height H _r .

FIG. 12A and FIG. 12B are explanatory diagrams of openings other than the specific fire prevention equipment. For the opening, in the case of compartment area A _r = 35m ^2, 50m ² is as shown in FIG. 12 (a), 1 one opening on the open corridor portion side W1 = 1.7m (W) × 1.3m (H ) And two openings W2 = 1.2m (W) × 0.6m (H) and W3 = 1.7m (W) × 1.75m (H) on the balcony side.
Further, in the case of the partition area A _r = 50 m ² and 80 m ² , as shown in FIG. 12B, two openings W1 = 1.7 m (W) × 1.3 m (H), W4 on the open corridor side. = 1.2m (W) × 1.3m (H), there are 3 openings on the balcony side W2 = 1.2m (W) × 0.6m (H), W3 = 1.7m (W) × 1.75m (H) A case was assumed.

The fire load was 1200 MJ / m ² and the fire duration was 60 minutes.
FIG. 13 and FIG. 14 and Table 1 below show the steel material temperature prediction results of the columns and beams positioned in parallel with the openings of the dwelling part and the beams positioned perpendicular to the openings.

FIG. 13 is a plan view of a part of a dwelling unit, and shows a case of an orthogonal beam 31 perpendicular to a flame caught in a jet flame 30 inclined in a cross wind and a parallel beam 33 parallel to the flame.
FIG. 14 is a cross-sectional view of a part of the dwelling unit, and shows a case of a column 35 and a beam 37 parallel to the flame that is not caught in the jet flame 30. In FIGS. 13 and 14, the flame trajectory is indicated by a broken line.

As shown in FIG. 13 and Table 1, the orthogonal beam 31 perpendicular to the opening is not located in front of the opening, and is steel if the height of the beam is 45 cm or more above the upper end of the opening. The maximum temperature is about 616 ° C.
Certainly, this part slightly exceeds 600 ° C. However, this part is a cantilever part from the column, the stress is small, and it is safe because it is well below the high temperature collapse temperature 750 ° C. required from the shape of the beam.
Further, the steel material temperature of the joint portion 35 (parallel beam bolt joint portion) is 600 ° C. or less, and the stress transmitted from the parallel beam to be joined to the bolt is extremely small compared to the member yield strength, which is safe.

  Further, as shown in FIG. 14 and Table 1, the column 35 and the beam 37 parallel to the opening are not caught in the jet flame 30 if the blow-through width is 2/3 or more of the opening height, The maximum temperature is 581 ° C, which is safer than the allowable temperature of 600 ° C for refractory steel.

As described above, even if a fire breaks out at the dwelling unit, the direct beam 31 perpendicular to the opening is not located in front of the opening, and the height of the beam should be 45 cm or more above the upper end of the opening. The column 35 and the beam 37 parallel to the opening are safe if the blow-through width is 2/3 or more of the opening height.
The present invention has been made on the basis of the above studies, and specifically has the following configuration.

(1) An apartment house shared part structure according to the present invention is an apartment house shared part structure provided in an existing apartment house, comprising at least a corridor and a connecting corridor that connects the hallway and each door. While the beam and the column which comprise a body are comprised with a fireproof steel, the blow-off was provided between the said corridor and the opening part of each dwelling unit, It is characterized by the above-mentioned.

(2) Moreover, it is a housing complex shared part structure provided in an existing housing complex, comprising at least a corridor and a connecting corridor connecting the corridor and each door,
All or part of the beams and columns constituting the structure are made of fire-resistant steel, and a blow-off is provided between the corridor and the opening of each dwelling unit.

(3) It is a collective housing shared part structure provided in an existing collective housing, having a corridor and a connecting corridor connecting the corridor and each door, and having at least one of an external staircase, an elevator, and an elevator hall. The beams and columns constituting the corridor and the connecting corridor among the structural elements of the structure are made of refractory steel, and an atrium is provided between the corridor and the opening of each dwelling unit. Is.

  (4) Also, there is a corridor and a connecting corridor that connects the corridor and each door, and has at least one of an external staircase, an elevator, and an elevator hall, and is provided in an existing apartment complex. In the structural elements, all or part of the beams and pillars constituting the corridor and the connecting corridor are made of fire-resistant steel, and a blow-off is formed between the corridor and the opening of each dwelling unit. An apartment building shared structure characterized by being provided.

(5) Moreover, in the thing as described in said (1)-(4), the width | variety of a blow-off is set so that the following Formula may be satisfy | filled.
Blow-out width ≧ dwelling unit opening height x 2/3 + opening perimeter overhang length

(6) Moreover, it is a housing complex shared part structure provided in an existing housing complex, comprising at least a corridor and a connecting corridor that connects the corridor and each door, and the pillars constituting the structure are made of fire-resistant steel In addition, a nonflammable obstacle is provided to prevent a combustible material from being placed within a range of 10 cm around the base of the pillar.

(7) In the above (6), the nonflammable obstacle is formed of cement or mortar and has a height of at least 10 cm.

(8) Further, the nonflammable obstacle in the above (6) or (7) is characterized in that the upper surface is an inclined surface inclined downward from the column side toward the outside.

(9) Moreover, in the thing as described in said (1)-(4), the incombustible obstacle for preventing a combustible object from being placed in the range of 10 cm around the base of a pillar was installed. It is what.

(10) The nonflammable obstacle described in (9) above is formed of cement or mortar and has a height of at least 10 cm.

(11) Further, the nonflammable obstacle described in the above (9) or (10) is characterized in that the upper surface is an inclined surface inclined downward from the column side toward the outside. is there.

  In the present invention, at least a corridor and a connecting corridor that connects the corridor and each door are provided. With the construction, by providing a blow-off between the corridor and the opening of each dwelling unit, it is not necessary to perform fireproof coating, the work of fireproof coating can be omitted, the workability is excellent and the effective area can be increased. it can.

  FIG. 1 shows a horizontal section of an apartment house in which an apartment house common part structure according to an embodiment of the present invention is installed. 2 is a cross-sectional view taken along the line AA in FIG. 1, and FIG. 3 is a cross-sectional view taken along the line BB in FIG. Furthermore, FIG. 4 is explanatory drawing which isolate | separates and shows an apartment house shared part structure and the existing apartment house. Hereinafter, the present embodiment will be described with reference to FIGS.

The shared apartment structure 1 in the present embodiment includes an elevator 3, an elevator hall 5, a corridor 7 (including a meter box (MB)) connecting them, a connecting corridor 11 from the corridor to each of the dwelling units 9a to 9d, and Stairs 13 are provided.
The housing complex shared part structure 1 is structurally independent from the existing housing complex as shown in FIG. And the pillar and beam used as the framework of the collective housing shared part structure 1 are made of fireproof steel that is not fireproof coated.
The foundation, which is the main part in terms of structural strength, is an independent foundation or a cloth foundation, a solid foundation or a pile foundation, and the pillars and beams are made of H-shaped steel. Assembled with bolts or welding.
Further, the pillars are embedded in the floors of the corridor 7 and the connecting corridor 11 for each floor, the synthetic slab is used for the floor, and the synthetic slab or the folded plate is used for the roof.

In the collective housing shared part structure 1 configured as described above, the atrium 17 is provided between the windows 15a to 15d and the corridor 7 in each of the dwelling units 9a to 9d. And the width | variety (distance of the window parts 15a-15d and the corridor 7) of this blow-off part 17 is set as follows.
Atrium width ≥ Dwelling unit opening height x 2/3
By setting the width of the atrium as described above, the temperature of the pillars and beams constituting the apartment building common part structure 1 can be increased even if a flame blows out from the opening when there is a fire in the dwelling unit. Even in a refractory steel that is suppressed to 600 ° C. or less and is not covered with a refractory coating, the proof stress can be within an allowable range.

5 is an enlarged view of a portion C surrounded by a circle in FIG. 2, and FIG. 6 is an enlarged view of a portion D surrounded by a circle in FIG. As shown in FIG. 5, at the base of the corridor 7 and the connecting corridor 11 of each floor of the pillar 21 constituting the fifth floor of the apartment building shared part structure 1, the three surfaces have a range of 10 cm from the flange 21 a of the pillar 21. It is surrounded by a concrete enclosure 23 having a height of 10 cm. In addition, the same concrete enclosure is given also about the 1st floor-the 4th floor.
Moreover, as shown in FIG. 6, the concrete enclosure 27 is given in the range of 10 cm in the perimeter direction in the base of the pillar 25 which contact | connects the lowest GL line.

  By providing the concrete enclosures 23 and 27 shown in FIGS. 5 and 6, the combustible material cannot be placed in the vicinity of the pillar, that is, in the concrete enclosure. Therefore, even if a local fire occurs, at least the flame is separated from the pillar by 10 cm. In this case, as described above, the temperature of the column is predicted to be at most 581 ° C., and if this temperature is within the allowable range of the refractory steel, there is no problem in strength.

As mentioned above, in this Embodiment, when providing the housing complex shared part structure 1, the blower 17 is provided between the window part of the dwelling unit side, and the width | variety of the blower 17 is blown width> opening part of a dwelling unit. The height is set to 2/3, and the concrete enclosures 23 and 27 are provided at the bases of the columns of the apartment building common part structure 1. Therefore, when a fire occurs in a dwelling unit and In any case where a fire has occurred, the refractory steel constituting the apartment house shared part structure 1 only rises to a temperature at which the proof strength is maintained within an allowable range.
As a result, the apartment building common part structure can be made of fireproof steel with fireproof coating, and the problem of troublesome construction of fireproof coating or reduction of the effective area can be solved.

  Further, in this embodiment, since the concrete enclosures 23 and 27 are provided as non-combustible members applied to the base of the pillar, rainwater or the like does not collect at the base of the pillar, and corrosion of the base of the pillar is prevented. In addition, it is more preferable that the upper surface of the concrete is an inclined surface that is inclined downward from the column side to the outside, so that rainwater and the like can be more reliably prevented.

In addition, although the example which provided concrete as a nonflammable member given to the base of a pillar was shown in said example, it replaced with concrete and what is necessary is just a nonflammable thing.
Moreover, in the above example, there was no overhanging part such as eaves in the window part, but when there is an overhanging part around the window part, the flame blown out from the dwelling unit is more along the overhanging part. In this case, the width of the blow-through 17 is increased by the length of the protruding portion.
Furthermore, in the above example, an example in which H-shaped steel is used as a column / beam that forms the framework of the housing complex 1 is shown. However, instead of H-shaped steel, steel pipes are used, or H-shaped steel and steel pipes are used. Or may be used in combination.

The collective housing shared part structure 1 shown in the above embodiment includes a corridor 7, a communication corridor 11, an elevator 3, an elevator hall 5, and a staircase 13. However, although the corridor 7 and the communication corridor 11 are indispensable as elements constituting the housing complex shared part structure, the elevator 3, the elevator hall 5, and the stairs 13 are not essential. It varies depending on various conditions such as conditions on the apartment house side where the structure 1 is installed.
Therefore, there are stairs but no elevator and elevator hall, or there are stairs and elevators, but there is no elevator hall. Furthermore, there is only an elevator, and there are stairs and elevator halls. There may be no cases. The case where there is an elevator and there is no elevator hall is a case where the elevator is directly connected to the hallway.

  In addition, it is not necessary to use fire-resistant steel as structural members (columns, beams) constituting elevators, elevator halls, and stairs, which are components other than the corridors and communication corridors that constitute the apartment building common-use structure. You may use the steel material which gave.

  In addition, regarding the structural members of the corridor and the communication corridor that constitute the shared apartment structure, not all the structural members are made of refractory steel, but a part of the structural members may be made of refractory steel. . For example, even when a corridor is provided in the corridor as shown in the above embodiment, in the case where only the necessary dimensions shown in the above embodiment cannot be taken as the width of the corridor, the beam constituting the corridor, You may make the steel material which gave the fireproof coating the part near the window part of the dwelling unit in a pillar.

It is a plane sectional view of an apartment house which installed an apartment house common use part structure concerning one embodiment of the present invention. It is arrow AA sectional drawing of FIG. It is arrow BB sectional drawing of FIG. It is explanatory drawing which isolate | separates and shows a housing complex shared part structure and the existing housing complex. FIG. 3 is an enlarged view of a portion C surrounded by a circle in FIG. 2. FIG. 3 is an enlarged view of a D portion surrounded by a circle in FIG. 2. It is explanatory drawing of the design fire source model. It is explanatory drawing of the heating range by the radiation from the fire source with respect to H-section steel. It is an illustration of how to take the view factor _F 1, _{F 2.} It is explanatory drawing of a steel material temperature prediction result. It is explanatory drawing of a division area and depth. It is explanatory drawing of openings other than specific fire prevention equipment. It is a partial top view of a dwelling unit, and is explanatory drawing explaining the influence of an ejection flame. It is a partial sectional view of a dwelling unit, and is an explanatory view explaining the influence of a jet flame.

Explanation of symbols

1 apartment housing common part, 3 elevator, 5 elevator hall, 7 corridor, 9a, 9b, 9c, 9d dwelling unit, 11 connecting corridor, 15a, 15b, 15c, 15d window part, 17 atrium, 23, 27 concrete enclosure.

Claims (11)

An apartment building shared part structure provided in an existing apartment house, comprising at least a hallway and a connecting hallway connecting the hallway and each door,
A structure for a shared apartment building, wherein the beams and columns constituting the structure are made of fire-resistant steel, and a colonnade is provided between the corridor and the opening of each dwelling unit. An apartment building shared part structure provided in an existing apartment house, comprising at least a hallway and a connecting hallway connecting the hallway and each door,
A structure for a shared apartment building, wherein all or part of the beams and pillars constituting the structure are made of fire-resistant steel, and an atrium is provided between the hallway and the opening of each dwelling unit. It has a corridor and a connecting corridor that connects the corridor and each door, and has at least one of an external staircase, an elevator, and an elevator hall, and is a housing complex shared part structure provided in an existing housing complex,
Among the structural elements of the structure, the beams and columns constituting the corridor and the connecting corridor are made of fireproof steel, and a colonnade is provided between the corridor and the opening of each dwelling unit Shared part structure. It has a corridor and a connecting corridor that connects the corridor and each door, and has at least one of an external staircase, an elevator, and an elevator hall, and is a housing complex shared part structure provided in an existing housing complex,
Among the structural elements of the structure, all or part of the beams and columns constituting the corridor and the connecting corridor are made of fire-resistant steel, and a vent is provided between the corridor and the opening of each dwelling unit. A featured housing complex structure. The apartment house shared part structure according to claim 1, wherein the width of the atrium is set to satisfy the following formula.
Blow-out width ≧ dwelling unit opening height x 2/3 + opening perimeter overhang length An apartment building shared part structure provided in an existing apartment house, comprising at least a hallway and a connecting hallway connecting the hallway and each door,
An assembly comprising the pillars constituting the structure made of fire-resistant steel and non-combustible obstacles for preventing combustibles from being placed in a range of 10 cm around the base of the pillars Housing common use structure. The non-combustible obstacle is formed of cement or mortar and has a height of at least 10 cm. The shared part structure for an apartment house according to claim 6 or 7, wherein the nonflammable obstacle has an inclined surface whose upper surface is inclined downward from the column side toward the outside. The non-combustible obstacle was installed so that a combustible material might not be put in the range of 10 cm around the base of a pillar, The apartment house common use part as described in any one of Claims 1-4 characterized by the above-mentioned. Structure. The non-combustible obstacle is formed of cement or mortar and has a height of at least 10 cm. The common part structure for an apartment house according to claim 9 or 10, wherein the nonflammable obstacle has an inclined surface whose upper surface is inclined downward from the column side toward the outside.

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