JP2017172136A - Evacuation stair tower - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an evacuation stair tower that suppresses bending of a beam even when exposed to a horizontal load caused by tsunami, etc.SOLUTION: An evacuation stair tower 3 includes a stair 31 serving as a passageway to residential units on a plurality of stories, and a column 311 and a beam 30 constituting a main structural frame. A level difference beam 30A is provided between a floor section 34 and a stair landing floor section 35 of each story. The level difference beam 30A has an inclined part 30a at a location corresponding to a stair space between the floor section 34 and the stair landing floor section 35. The inclined part 30a connects horizontal parts of a floor height corresponding respectively to the floor section 34 and the stair landing floor section 35.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an evacuation stair tower that mainly provides an emergency evacuation site when a tsunami occurs.

  An evacuation stair tower 100 shown in FIG. 5 can be considered as an emergency evacuation site when a tsunami or the like occurs. This escape stair tower 100 has a structure in which, for example, pillars 101 are provided at four corners, and beams 102 forming the floor portions 106 of the second and third floors are fixed to the pillars 101. The column 101 and the beam 102 form a main frame of the evacuation stair tower 100. A landing beam 104 is provided separately from the beam 102 on the landing floor 104 provided for the bent stairs 103.

  Although it does not provide an emergency evacuation site, Patent Document 1 describes that a staircase frame and the like is manufactured at a factory and can be made into a self-supporting staircase simply by assembling it at the construction site. An outdoor staircase is disclosed in which a beam and a lower-end staircase support beam are not doubled, and the staircase beam does not get in the way or break the appearance. In addition, Patent Document 2 is easy to construct because it is not necessary to support and support heavy staircase parts, it is easy to effectively use the bottom of the staircase, the number of members is small, and the staircase beam is obstructive or the appearance is broken. There are no outdoor stairs disclosed.

Japanese Patent No. 4171350 Japanese Patent No. 4257153

  In the evacuation stair tower 100 shown in FIG. 5, a horizontal bending force acts on the beam 102 when receiving a horizontal load due to a tsunami or the like. And if it is the location of the said floor part 106 of the said beam 102, the said load of the said horizontal direction can be transmitted to the said pillar 101 via the said floor part 106. FIG. However, in the staircase space (blowhole) where the bending staircase 103 of the beam 102 is provided and the place where the landing beam 105 is provided, there is no floor portion of the beam 102, and these portions are continuous. Therefore, the beam 102 may be bent and deformed by the horizontal load. On the other hand, if a large-sized beam is used to prevent this bending deformation, problems such as a narrow space and an increased material cost arise.

  And the technique of the said patent documents 1 and 2 is not a structure which considered receiving a tsunami etc., and even if the beam part which inclines exists, this beam part does not make the main frame. .

  In view of the above circumstances, an object of the present invention is to provide an evacuation stair tower that can hardly cause bending of a beam even when a horizontal load is applied due to a tsunami or the like.

  In order to solve the above-described problems, the evacuation stair tower of the present invention includes an stairs and a pillar and a beam as a main frame, and provides an emergency evacuation site. From the floor of each floor to the landing floor, A beam that is hung to be a main frame is provided, and the beam has an inclined portion at a position corresponding to a staircase space between the floor portion and the landing floor portion, and the floor portion and A horizontal portion having a floor height corresponding to each of the landing floor portions is connected.

  If it is said structure, the load of the horizontal direction concerning each horizontal part of the said beam can be transmitted to the said pillar in each of the said floor part and the said landing floor part. On the other hand, although the floor portion does not exist at the inclined portion of the beam because of the staircase space, the section where the floor portion does not exist is shorter than in the conventional case, so the beam is bent and deformed by the horizontal load. The fear can be reduced. Moreover, it is not necessary to use a large-sized beam, and the material cost can be reduced.

  The staircase is a shared staircase serving as a passage to a dwelling unit provided on a multi-story floor, and may include a rooftop serving as an evacuation site and an evacuation means reaching the rooftop. According to this, it is possible to ascend the evacuation means such as the common stairs and the evacuation stairs and evacuate to the roof.

  An outer wall may be provided on the peripheral side. According to this, when the said evacuation stair tower makes the partial appearance of an apartment house, the fall of the aesthetics as the whole apartment house when not providing an outer wall can be avoided, and crime prevention can be improved. On the other hand, when the outer wall is provided, a large load is received in the horizontal direction, and it is possible to withstand such a large horizontal load.

  A body edge to which an outer wall plate is fixed, and a spacer that supports the body edge, the boundary being a boundary between the floor portion and the staircase space at the floor portion and the staircase space at the landing floor portion It may be provided on the side. According to this, the load of the horizontal direction which the said outer wall receives can be transmitted to the said floor part and the said landing floor part via the said stud.

  According to the present invention, even when the evacuation stair tower receives a load in the horizontal direction due to a tsunami or the like, it is possible to prevent the beam from being bent.

It is explanatory drawing which showed a part of refuge stair tower and refuge building which concerns on embodiment of this invention by the perspective view. It is a schematic side view of the escape stair tower shown in FIG. It is a schematic plan view of the escape stair tower shown in FIG. It is the schematic side view which illustrated the main frame of the escape stair tower of FIG. It is a schematic side view of the escape stair tower compared with the present invention.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
As shown in FIGS. 1, 2, and 3, the evacuation building 1 includes an apartment house portion 2 and an evacuation stair tower 3 according to this embodiment. The apartment house part 2 includes a dwelling unit on a multi-story floor. In this example, the housing complex part 2 is assumed to have structural strength against tsunami. The structural strength against tsunami can be set based on, for example, “Explanation of structural requirements for tsunami evacuation buildings” by the Ministry of Land, Infrastructure, Transport and Tourism.

  The evacuation stair tower 3 includes a common staircase 31 that becomes a passage to the dwelling unit. The height of the escape stair tower 3 is higher than the roof of the apartment house 2 and is, for example, about 10 m. The structural strength of the escape stair tower 3 is larger than the structural strength of the apartment house 2 and can withstand a tsunami force of about 5 m in depth, and a large tsunami that destroys the apartment house 2 It is designed so that the destruction of the evacuation stairs tower 3 can be avoided even when the

  The evacuation stair tower 3 is constructed using a rigid frame structure in which a column (for example, a square steel pipe) 311 and a beam (for example, an H-shaped steel) 30 serving as a main frame are joined. The columns 311 are erected at the four corners of the escape stair tower 3, and each beam 30 is fixed to the columns 311. The evacuation stair tower 3 has a rectangular cross section, and the first floor on the short side is provided with an entrance 36, and the second and third floors are provided with fenced openings 37. It has been. The fenced opening 37 is provided on the landing floor portion 35 side of the escape stair tower 3, and the landing floor portion 35 side is provided so as to protrude from the outer wall surface of the apartment house portion 2. Yes. An outer wall 38 is provided on the long side of the outer periphery of the escape stair tower 3. An opening 38 a is formed in the outer wall 38 of the escape stair tower 3. Of course, a configuration in which such an opening 38a is not provided is also possible.

  The evacuation stair tower 3 is provided with a roof 32 serving as an evacuation site. A fence having a large number of gaps is provided on the peripheral edge of the rooftop 32. The evacuation stair tower 3 is provided with an evacuation stairs 33 formed of, for example, a spiral staircase that reaches the rooftop 32.

  A step beam 30 </ b> A is provided as the beam 30 at a location between the second side floor and the third floor on the long side of the escape stair tower 3. The step beam 30A is bridged from the landing floor portion 35, which is a folded portion of the shared staircase 31 on the upper and lower floors, to the floor portion 34 of each floor. In FIG. 3, the floor 34 and the landing floor 35 are shown by cross hatching. The step beam 30A has an inclined portion 30a at a location corresponding to a staircase space (blow-out) between the floor portion 34 and the landing floor portion 35, and the floor portion 34 and the landing floor portion. The horizontal part 30b of the floor height corresponding to each of 35 is connected by the inclined part 30a. The step beams 30A are provided on both long sides of the escape stair tower 3. In addition, the floor 34 and the landing floor 35 can support a load in the vertical direction, and can transmit a load in the horizontal direction to a structure positioned in the horizontal direction. For example, the deck plate A floor structure in which concrete is cast or a floor structure in which an ALC (lightweight foamed concrete) plate or the like is laid is employed. In the floor structure on which the ALC plate or the like is laid, a structure using a horizontal brace is desirable in order to transmit a load in the horizontal direction.

  Further, as shown in FIG. 4, a spacer 38 b is provided on the outer wall 38 of the escape stair tower 3. Some of the studs 38b are provided on the boundary side of the floor portion 34 with the staircase space and on the boundary side of the landing floor portion 35 with the staircase space. That is, the space 38b is provided at a place where a floor exists. A body edge (not shown) is horizontally supported on the intermediate pillar 38b, and the outer wall 38 is formed by fixing an outer wall plate to the body edge. In addition, although the detail of the welding location and joining location in the said level | step difference beam 30A etc. was shown in the said FIG. 4, it is not limited to such a joining aspect.

  With the above configuration, the load in the horizontal direction applied to each horizontal portion 30b of the step beam 30A can be transmitted to the column 311 at each of the floor portion 34 and the landing floor portion 35. On the other hand, although there is no floor at the inclined portion 30a of the step beam 30A, the section where the floor portion is not present is shortened compared to the conventional case, so that the step beam 30A is bent and deformed by the horizontal load. The fear can be reduced. Moreover, it is not necessary to use a large-sized beam, and the material cost can be reduced. Furthermore, if the beam of the main frame and the landing beam are doubled as in the conventional case, the double beam can be seen from the opening 37 with the fence provided on the second floor and the third floor, and the aesthetic appearance is lowered. However, with the evacuation stair tower 3, such a decrease in aesthetics does not occur. Moreover, since the landing beam is not necessary, the material cost can be reduced.

  Having the shared staircase 31 serving as a passage to a dwelling unit provided on a multi-story floor, and having a rooftop 32 serving as an evacuation site and an escape staircase 33 leading to the rooftop 32, the shared staircase 31 and It is possible to evacuate to the rooftop 32 by ascending the evacuation stairs 33.

  When the outer wall 38 is provided on the outer periphery of the evacuation stair tower 3, when the evacuation stair tower 3 forms a part of the apartment house, the deterioration of the aesthetic appearance of the entire apartment house when the outer wall 38 is not provided is avoided. It can also improve crime prevention. On the other hand, when the outer wall 38 is provided, a larger load is received in the horizontal direction, but it is possible to withstand such a large horizontal load.

  In the outer wall 38, when the studs 38 b are provided on the boundary side of the floor portion 34 with the staircase space and on the border side of the landing floor portion 35 with the staircase space, the horizontal wall 38 receives the outer wall 38. A load can be transmitted to the floor portion 34 and the landing floor portion 35 via the stud 38b.

  The inclination angle of the stepped beam 30A at the inclined portion 30a may be the same as the inclination angle of the side plate of the shared staircase 31. Further, a step beam such as the step beam 30A can be applied to a so-called skip floor in a residence.

  As mentioned above, although embodiment of this invention was described with reference to drawings, this invention is not limited to the thing of embodiment shown in figure. Various modifications and variations can be made to the illustrated embodiment within the same range or equivalent range as the present invention. In addition, tsunami is mainly assumed, but it can also be used as an emergency evacuation site for disasters such as floods and storm surges where buildings are submerged.

1: Evacuation building 2: Apartment house part 3: Evacuation stair tower 28b: Space pillar 30: Beam 30A: Step beam 30a: Inclined part 30b: Horizontal part 31: Common stairs 32: Rooftop 33: Evacuation stairs (evacuation means)
34: Floor part 35: Landing floor part 36: Entrance part 37: Opening part 38 with a fence: Outer wall part 38a: Opening 38b: Space pillar 311: Pillar

Claims (4)

  In the evacuation stair tower, which has stairs and pillars and beams to be the main frame, and provides an emergency evacuation site, the beam to be the main frame is provided from the floor part of each floor to the landing floor part. There is an inclined part at a position corresponding to the staircase space between the floor part and the landing floor part, and the inclined part connects the horizontal part of the floor height corresponding to each of the floor part and the landing floor part. Evacuation stair tower, characterized by   The escape stair tower according to claim 1, wherein the staircase is a common staircase serving as a passage to a dwelling unit provided on a multi-layer floor, and includes a rooftop serving as an evacuation site and evacuation means reaching the rooftop. Escape stair tower that features.   The escape stair tower according to claim 1 or 2, wherein an outer wall is provided on a peripheral side.   The escape stair tower according to claim 3, further comprising: a trunk edge to which an outer wall plate is fixed; and a stud that supports the trunk, wherein the stud is on a boundary side of the floor with the staircase space; An escape stair tower provided on a boundary side of the landing floor with the stair space.

Images