JP7390113B2 - Structure for boarding into existing buildings - Google Patents

Structure for boarding into existing buildings Download PDF

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JP7390113B2
JP7390113B2 JP2019087576A JP2019087576A JP7390113B2 JP 7390113 B2 JP7390113 B2 JP 7390113B2 JP 2019087576 A JP2019087576 A JP 2019087576A JP 2019087576 A JP2019087576 A JP 2019087576A JP 7390113 B2 JP7390113 B2 JP 7390113B2
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智美 木原
俊司 山本
健嗣 田中
資貴 赤澤
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Takenaka Corp
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Description

本発明は、既存建物に作業者が乗り込み可能な乗り込み用構造物に関する。 The present invention relates to a boarding structure that allows workers to board an existing building.

例えば、ガス等の危険物を保管するタンクでは、作業者がタンクに備えられた梯子や外周歩廊を昇降することで、メンテナンス作業等の各種の作業を行っている。このとき、例えば、作業者が梯子にて昇降すると、作業者の作業負担が増大することになる。そこで、既存建物では、作業者が既存建物に乗り込み可能な乗り込み構造物を構築することが望まれている。 For example, in tanks for storing hazardous materials such as gas, workers perform various maintenance work and other tasks by climbing up and down ladders provided on the tank or along a walkway around the tank. At this time, for example, if the worker goes up and down on a ladder, the work burden on the worker will increase. Therefore, for existing buildings, it is desired to construct a boarding structure that allows workers to board into the existing building.

特許文献１では、タンクではないものの、既存建物に対する補強構造体として、補強階段を後付けで備える点が記載されている。このように、既存建物に対して新設階段を備え、新設階段と既存建物とを接続することで、作業者は、既存建物への乗り込みが可能となる。 Patent Document 1 describes that, although it is not a tank, a reinforcement staircase is retrofitted as a reinforcement structure for an existing building. In this way, by providing new stairs to an existing building and connecting the new stairs to the existing building, workers can enter the existing building.

特許第５４３３０３５号公報Patent No. 5433035 特許第３６０８５９８号公報Patent No. 3608598

新設階段と既存建物とを接続するに当たり、繋ぎ材等を介して新設階段と既存建物とを接続すると、地震時に新設階段から既存建物に対して水平力が伝達されてしまい、既存建物に悪影響が及ぶことになる。したがって、特に、既存建物を、危険物を保管するタンク等とする場合には、乗り込み構造物として、既存建物に地震時の水平力が伝達されない構造を採用することが求められている。 When connecting the new stairs and the existing building, if the new stairs and the existing building are connected through a connecting material, horizontal force will be transmitted from the new stairs to the existing building during an earthquake, which will have a negative impact on the existing building. It will be extended. Therefore, especially when an existing building is used as a tank or the like for storing dangerous materials, it is required to adopt a structure that prevents the horizontal force from being transmitted to the existing building during an earthquake as a boarding structure.

そこで、例えば、特許文献２に記載の如く、新設階段側の踊り場と既存建物側の踊り場とを相対的に変位可能に重ね合わせたエキスパンションジョイントを備える構造を採用することで、地震時に新設階段から既存建物に対して水平力が伝達されるのを抑制することが考えられる。 Therefore, for example, as described in Patent Document 2, by adopting a structure with an expansion joint in which the landing on the side of the new stairs and the landing on the side of the existing building are overlapped so that they can be relatively displaced, it is possible to move the stairs from the new stairs in the event of an earthquake. It is possible to suppress the transmission of horizontal force to existing buildings.

しかしながら、この場合には、既存建物側に対して、エキスパンションジョイントのための踊り場等を後施工しなければならず、施工性の低下や構造の複雑化を招くものとなる。また、既存建物を、危険物を保管するタンク等とする場合には、既存建物に対する後施工が行えない場合もある。 However, in this case, landings and the like for the expansion joint must be constructed afterward on the existing building side, resulting in decreased workability and complication of the structure. Furthermore, if an existing building is to be used as a tank or the like for storing hazardous materials, it may not be possible to carry out post-construction on the existing building.

この実情に鑑み、本発明の主たる課題は、既存建物に対する地震時の水平力の伝達を抑制しながら、既存建物に対する後施工も必要せずに、既存建物に作業者が乗り込み可能な既存建物への乗り込み用構造物を提供する点にある。 In view of this situation, the main problem of the present invention is to provide an existing building that allows workers to enter the existing building without requiring post-construction work on the existing building while suppressing the transmission of horizontal force to the existing building during an earthquake. The object of the present invention is to provide a structure for boarding.

本発明の第１特徴構成は、既存建物に対する新設外階段と、
前記新設外階段における階段部材からの跳ね出しにより構築された歩廊とが備えられ、
前記歩廊は、前記既存建物と前記新設外階段との間に架け渡して、前記新設外階段から前記既存建物への乗り込み歩廊として備えられ、
前記乗り込み歩廊は、前記既存建物との間に繋ぎ材を介することなく、地震時の水平力の伝達を抑制する状態で前記既存建物に架け渡され、
前記乗り込み歩廊は、前記既存建物の架け渡される部位よりも高い位置に配置され、前記既存建物に対して長期荷重による鉛直力が伝達されるのを抑制する状態で前記階段部材に片持ち支持され、
前記乗り込み歩廊の下面部には、前記既存建物の架け渡される部位の上面部に当接する滑り部が間隔を隔てて複数備えられ、複数の滑り部の全てが、前記既存建物の上面部に直接当接している点にある。 A first characteristic configuration of the present invention is a new external staircase for an existing building;
a walkway constructed by protruding from the stair member in the new external staircase;
The walkway spans between the existing building and the new external staircase, and is provided as a boarding walkway from the new external staircase to the existing building,
The boarding walkway is spanned over the existing building in a manner that suppresses the transmission of horizontal force during an earthquake, without intervening a connecting material between the boarding walkway and the existing building,
The boarding walkway is located at a higher position than the part of the existing building to be spanned over, and is cantilevered by the stairway member in a manner that suppresses vertical force due to long-term loads from being transmitted to the existing building. ,
The lower surface of the boarding walkway is provided with a plurality of sliding parts at intervals that contact the upper surface of the part of the existing building to be bridged, and all of the plurality of sliding parts are directly connected to the upper surface of the existing building. It's at the point where they touch .

本構成によれば、乗り込み歩廊は、既存建物との間に繋ぎ材を介することなく、地震時の水平力の伝達を抑制する状態で既存建物に架け渡されているので、新設階段から既存建物に対して、地震時に水平力が伝達されるのを抑制することができる。しかも、乗り込み歩廊は、階段部材からの跳ね出しにより構築されているので、既存建物に対して架け渡すだけでよく、既存建物に対する後施工も必要としない。 According to this configuration, the boarding walkway is spanned over the existing building in a manner that suppresses the transmission of horizontal force during an earthquake, without using any connecting material between the boarding walkway and the existing building. However, it is possible to suppress the transmission of horizontal force during an earthquake. Furthermore, since the boarding walkway is constructed by projecting from the stair member, it is sufficient to simply span the existing building, and no post-construction work is required for the existing building.

以上のことから、既存建物に対する地震時の水平力の伝達を抑制しながら、既存建物に対する後施工も必要せずに、既存建物に作業者が乗り込み可能な乗り込み用構造物を提供することができる。
しかも、本構成によれば、地震時には、滑り部が既存建物に対して滑り移動するので、新設階段から既存建物に水平力が伝達されるのを抑制することができる。乗り込み歩廊は、滑り部を介して既存建物に当接されているので、作業者が乗り込み歩廊を歩行するとき等の振動を防止することができる。
更に、本構成によれば、乗り込み歩廊は、階段部材に片持ち支持されているので、新設外階段から既存建物に対して、長期荷重による鉛直力が伝達されるのを抑制することができる。これにより、地震時の水平力の伝達だけでなく、長期荷重による鉛直力の伝達をも抑制することができるので、新設階段を既存建物から独立して構築することができる。 From the above, it is possible to provide a boarding structure that allows workers to board into an existing building, while suppressing the transmission of horizontal force to the existing building during an earthquake, and without requiring post-construction on the existing building. .
Moreover, according to this configuration, in the event of an earthquake, the sliding portion slides against the existing building, so it is possible to suppress horizontal force from being transmitted from the newly constructed stairs to the existing building. Since the boarding walkway is in contact with the existing building via the sliding portion, it is possible to prevent vibrations caused when workers board the boarding walkway and walk on the walkway.
Furthermore, according to this configuration, since the boarding walkway is cantilevered by the staircase member, it is possible to suppress vertical force due to long-term loads from being transmitted from the new external staircase to the existing building. This makes it possible to suppress not only the transmission of horizontal force during an earthquake, but also the transmission of vertical force due to long-term loads, making it possible to construct new stairs independently from the existing building.

本発明の第２特徴構成は、前記新設外階段は、繋ぎ材を介することなく、独立して自立可能とする基礎部を備え、その基礎部に階段部分の一部が備えられている点にある。 A second characteristic configuration of the present invention is that the newly constructed external staircase is provided with a base part that can be independently self-supported without using a connecting material, and a part of the staircase part is provided on the base part. be.

本構成によれば、新設外階段は、基礎部によって、繋ぎ材を介することなく、独立して自立可能であるので、例えば、地震時等に、新設外階段の転倒を防止することができる。このように、新設外階段を自立可能とする基礎部は、大型なものとなるが、その大型な基礎部を利用して、新設外階段の階段部分を備えるので、転倒防止を図るための構造を利用しながら、階段部分を備えることができ、構造の簡素化を効率よく図ることができる。 According to this configuration, the newly constructed external staircase can independently stand on its own without using a connecting member, so that it is possible to prevent the newly constructed external staircase from falling down, for example, in the event of an earthquake. In this way, the foundation that allows the new external staircase to stand on its own will be large, but since the large foundation is used to provide the stair portion of the new external staircase, the structure is designed to prevent falls. It is possible to provide a staircase part while utilizing the structure, and the structure can be efficiently simplified.

本発明の第３特徴構成は、新設外階段の基礎部は、前記既存建物の既存基礎部に接続されている点にある。 A third feature of the present invention is that the foundation of the new external staircase is connected to the existing foundation of the existing building.

本構成によれば、新設外階段の基礎部を既存建物の既存基礎部に接続することで、例えば、地震時における新設外階段と既存建物の転倒防止を効率よく図ることができる。 According to this configuration, by connecting the foundation of the new external staircase to the existing foundation of the existing building, it is possible to efficiently prevent the new external staircase and the existing building from falling during an earthquake, for example.

タンク及び乗り込み用構造物の全体を示す斜視図Perspective view showing the entire tank and boarding structure タンク及び乗り込み用構造物の全体を示す側面図Side view showing the entire tank and boarding structure 新設外階段の一部を示す図Diagram showing part of the new external staircase 乗り込み歩廊、新設外階段、及び、タンクの外周歩廊を下方側から見た図View from below of the boarding walkway, new external stairs, and tank outer walkway 乗り込み歩廊、新設外階段、及び、タンクの外周歩廊の側面図Side view of the boarding walkway, new external stairs, and tank outer walkway 乗り込み歩廊、新設外階段、及び、タンクの外周歩廊を下方側から見た図View from below of the boarding walkway, new external stairs, and tank outer walkway

本発明に係る既存建物への乗り込み用構造物の実施形態について、図面に基づいて説明する。
既存建物として、図１及び図２に示すように、例えば、ガス等の危険物を保管するタンク２が備えられ、乗り込み用構造物１は、タンク２に作業者等が乗り込み可能となる乗り込み用構造物１となっている。タンク２に対して乗り込み用構造物１を増築することで、作業者等がタンク２に乗り込んでメンテナンス作業等の各種の作業を行うことができる。 An embodiment of a structure for boarding into an existing building according to the present invention will be described based on the drawings.
As shown in FIGS. 1 and 2, the existing building is equipped with a tank 2 for storing dangerous substances such as gas, and the boarding structure 1 is a boarding structure that allows workers etc. to board the tank 2. This is structure 1. By adding the boarding structure 1 to the tank 2, a worker or the like can board the tank 2 and perform various tasks such as maintenance work.

タンク２は、上下方向に延びる円柱状に構成されており、タンク２の外周部には、径方向の外周側に跳ね出した外周歩廊３が備えられている。外周歩廊３は、上下方向で一定の所定間隔を隔てて複数配置されている。外周歩廊３の外周部には、上方側に延びる手摺４が備えられている。 The tank 2 has a cylindrical shape extending in the vertical direction, and the outer circumferential portion of the tank 2 is provided with an outer circumferential walkway 3 that protrudes toward the outer circumferential side in the radial direction. A plurality of outer peripheral walkways 3 are arranged at regular predetermined intervals in the vertical direction. A handrail 4 extending upward is provided on the outer periphery of the outer walkway 3.

乗り込み用構造物１は、図１及び図２に示すように、タンク２の外周歩廊３に対して作業者等が乗り込み可能に構成されている。乗り込み用構造物１は、タンク２に対する新設外階段１１と、新設外階段１１における階段部材１２からの跳ね出しにより構築された歩廊３１（図４及び図５参照）とが備えられている。 As shown in FIGS. 1 and 2, the boarding structure 1 is configured to allow a worker or the like to board the outer walkway 3 of the tank 2. The boarding structure 1 includes a new external staircase 11 for the tank 2, and a walkway 31 (see FIGS. 4 and 5) constructed by projecting from the stair member 12 of the new external staircase 11.

新設外階段１１は、図１及び図２に示すように、タンク２の横側部に近接する位置に構築されている。新設外階段１１における階段部材１２は、左右一対のささら桁１３に亘って配設された段板１４から構成された階段部分１５と、踊り場部分１６とを有している。新設外階段１１には、左右一対のささら桁１３及び踊り場部分１６の端部に亘る状態で、手摺２２が備えられている。 As shown in FIGS. 1 and 2, the new external staircase 11 is constructed at a position close to the lateral side of the tank 2. The stair member 12 of the new external staircase 11 has a stair portion 15 made up of step plates 14 disposed across a pair of left and right stringers 13, and a landing portion 16. The new external staircase 11 is provided with a handrail 22 extending over the left and right pair of stringers 13 and the ends of the landing portion 16.

新設外階段１１は、図１～図３に示すように、平面視で矩形の四隅に相当する位置に配置された４つの柱材１７（例えば、Ｈ形鋼）と、柱材１７同士等を連結する複数の梁材１８ａ、１８ｂ（例えば、Ｈ形鋼）と、梁材１８ｂ同士等を連結する複数の連結材１９（例えば、Ｈ形鋼）とが備えられている。ちなみに、図１では、柱材１７、梁材１８ａ、１８ｂ、連結材１９等を模式的に矩形状に示しているが、これらの各部材をどのような断面形状の鋼材とするかは適宜変更が可能である。 As shown in FIGS. 1 to 3, the new external staircase 11 consists of four pillars 17 (for example, H-shaped steel) placed at positions corresponding to the four corners of a rectangle in plan view, and pillars 17 that are connected to each other. A plurality of beam members 18a and 18b (for example, H-shaped steel) that are connected together and a plurality of connecting members 19 (for example, H-shaped steel) that connect the beam members 18b are provided. Incidentally, in FIG. 1, the column material 17, the beam materials 18a, 18b, the connecting material 19, etc. are schematically shown in a rectangular shape, but the cross-sectional shape of the steel material for each of these members may be changed as appropriate. is possible.

梁材１８ａ、１８ｂは、柱材１７同士の間隔が短い短尺の第１梁材１８ａと、柱材１７同士の間隔が大きい長尺の第２梁材１８ｂとが備えられている。第１梁材１８ａは、階段部分１５の横幅方向に沿う姿勢となり、第２梁材１８ｂは、階段部分１５の長さ方向に沿う姿勢となっている。連結材１９は、新設外階段１１の一端側（図３中左側）において、階段部分１５の長さ方向に間隔を隔てる状態で、第２梁材１８ｂ同士を連結するように複数備えられている。 The beam members 18a and 18b include a short first beam member 18a in which the distance between the pillar members 17 is short, and a long second beam member 18b in which the distance between the pillar members 17 is large. The first beam 18a is in a position along the width direction of the stair portion 15, and the second beam 18b is in a position along the length direction of the stair portion 15. A plurality of connecting members 19 are provided at one end side of the new external staircase 11 (on the left side in FIG. 3) so as to connect the second beam members 18b at intervals in the length direction of the stair portion 15. .

ささら桁１３については、図１及び図３に示すように、新設外階段１１の一端側（図３中左側）において、ささら桁１３の一端部が、連結材１９に連結固定されており、新設外階段１１の他端側（図３中右側）において、ささら桁１３の他端部が、第１梁材１８ａに連結固定されている。踊り場部分１６については、新設外階段１１の一端側（図３中左側）において、隣接して並ぶ２組の左右一対のささら桁１３に亘って配設された鋼板２０（図３及び図５参照）にて踊り場部分１６が構築されており、新設外階段１１の他端側においても、隣接して並ぶ２組の左右一対のささら桁１３に亘って配設された鋼板（図示省略）にて踊り場部分１６が構築されている。 Regarding the stringer 13, as shown in FIGS. 1 and 3, one end of the stringer 13 is connected and fixed to the connecting member 19 at one end side of the newly constructed external staircase 11 (on the left side in FIG. 3). At the other end of the external staircase 11 (on the right side in FIG. 3), the other end of the stringer 13 is connected and fixed to the first beam member 18a. Regarding the landing portion 16, a steel plate 20 (see FIGS. 3 and 5) is provided at one end of the new external staircase 11 (on the left side in FIG. 3) and extends across two pairs of left and right stringers 13 that are lined up next to each other. ), and on the other end side of the new exterior staircase 11, a steel plate (not shown) is installed across two adjacent pairs of left and right stringers 13. A landing section 16 has been constructed.

歩廊３１は、図２、図４及び図５に示すように、タンク２と新設外階段１１との間に架け渡して、新設外階段１１からタンク２への乗り込み歩廊３１として備えられている。歩廊３１は、図４及び図５に示すように、新設外階段１１の階段部材１２に片持ち支持され、タンク２との間に繋ぎ材を介することなく、タンク２に架け渡されている。図４は、歩廊３１、タンク２の外周歩廊３、新設外階段１１の踊り場部分１６を下方側から見た図を示しており、図５は、図４における歩廊３１、タンク２の外周歩廊３、新設外階段１１の踊り場部分１６を示す側面図である。 As shown in FIGS. 2, 4, and 5, the walkway 31 is provided as a walkway 31 for entering the tank 2 from the new outside stairs 11 by spanning between the tank 2 and the new outside stairs 11. As shown in FIGS. 4 and 5, the walkway 31 is supported in a cantilever manner by the staircase member 12 of the new external staircase 11, and is spanned over the tank 2 without using a connecting material between the walkway 31 and the tank 2. FIG. 4 shows the walkway 31, the outer walkway 3 of the tank 2, and the landing part 16 of the new external staircase 11 viewed from below, and FIG. 5 shows the walkway 31 and the outer walkway 3 of the tank 2 in FIG. , is a side view showing the landing portion 16 of the newly constructed external staircase 11.

歩廊３１は、図４及び図５に示すように、階段部材１２における踊り場部分１６からタンク２側に跳ね出した平面視で矩形状の板状部材３２（例えば、鋼板）にて構築されている。第２梁材１８ｂの上部には、第２梁材１８ｂの長さ方向に沿う姿勢で支持部材３３が備えられ、板状部材３２における踊り場部分１６側が支持部材３３に連結固定されている。板状部材３２である歩廊３１は、鋼板２０である踊り場部分１６よりも一段高い位置に配置されている。 As shown in FIGS. 4 and 5, the walkway 31 is constructed of a plate member 32 (for example, a steel plate) that is rectangular in plan view and protrudes from the landing portion 16 of the staircase member 12 toward the tank 2 side. . A support member 33 is provided on the upper part of the second beam member 18b in a posture along the length direction of the second beam member 18b, and the landing portion 16 side of the plate member 32 is connected and fixed to the support member 33. The walkway 31, which is a plate-shaped member 32, is arranged at a position one step higher than the landing portion 16, which is a steel plate 20.

図４に示すものでは、板状部材３２である歩廊３１を踊り場部分１６よりも一段高い位置に配置しているが、図示は省略するが、例えば、板状部材３２である歩廊３１を踊り場部分１６よりも一段低い位置にも配置することができる。この場合には、支持部材３３を省略して、板状部材３２を第２梁材１８ｂに固定連結することで、歩廊３１を踊り場部分１６よりも一段低い位置に構築することができる。 In what is shown in FIG. 4, the walkway 31, which is a plate-like member 32, is arranged at a position one step higher than the landing part 16, but although not shown, for example, It can also be placed at a position one step lower than 16. In this case, by omitting the support member 33 and fixedly connecting the plate member 32 to the second beam member 18b, the walkway 31 can be constructed at a position one step lower than the landing portion 16.

ここで、タンク２の外周歩廊３への乗り込み歩廊３１は、板状部材３２にて構築しているが、図示は省略するが、例えば、板状部材３２の幅方向の両端部に側壁板、及び、その側壁板から上方側に延びる手摺等を備えることもできる。 Here, the boarding walkway 31 of the tank 2 to the outer circumferential walkway 3 is constructed of a plate-like member 32, but although not shown, for example, side wall plates, It is also possible to provide a handrail or the like extending upward from the side wall plate.

板状部材３２におけるタンク２側には、滑り部３４が備えられ、板状部材３２である歩廊３１は、滑り部３４を介してタンク２の外周歩廊３に当接させる状態でタンク２の外周歩廊３に架け渡されている。板状部材３２である歩廊３１は、タンク２の外周歩廊３よりも高い位置に配置されており、歩廊３１の下面部がタンク２の外周歩廊３の上面部に当接可能に備えられている。 A sliding part 34 is provided on the tank 2 side of the plate-like member 32, and the walkway 31, which is the plate-like member 32, is in contact with the outer walkway 3 of the tank 2 via the sliding part 34, so that the walkway 31 extends around the outer circumference of the tank 2. It spans walkway 3. The walkway 31, which is a plate-shaped member 32, is arranged at a higher position than the outer walkway 3 of the tank 2, and is provided so that the lower surface of the walkway 31 can come into contact with the upper surface of the outer walkway 3 of the tank 2. .

滑り部４３は、板状部材３２の下面部に台金部材３５を介して取り付けられた当接部材３６にて構成され、当接部材３６が外周歩廊３の上面部に当接している。当接部材３６は、例えば、ピラーフロロゴールド等の摩擦係数の小さい材料にて構成されている。当接部材３６は、滑り材やエラストマー等の弾性部材にて構成することもできる。滑り部４３は、板状部材３２の長さ方向（新設外階段１１の踊り場部分１６からタンク２の外周歩廊３に向かう水平方向に沿う方向）に延設された状態で、板状部材３２の横幅方向に間隔を隔てて複数備えられている（例えば、板状部材３２の横幅方向の両端部位に相当する位置の夫々）。このようにして、地震発生時には、板状部材３２である歩廊３１が、滑り部３４によりタンク２の外周歩廊３の上面部を滑り移動することになり、乗り込み歩廊３１は、タンク２との間に繋ぎ材を介することなく、地震時の水平力の伝達を抑制する状態でタンク２に架け渡されている。 The sliding portion 43 is composed of an abutting member 36 attached to the lower surface of the plate member 32 via a base metal member 35, and the abutting member 36 is in contact with the upper surface of the outer walkway 3. The contact member 36 is made of a material with a small coefficient of friction, such as pillar fluoro gold, for example. The contact member 36 can also be made of an elastic member such as a sliding material or an elastomer. The sliding portion 43 extends in the length direction of the plate member 32 (in the horizontal direction from the landing part 16 of the new external staircase 11 to the outer walkway 3 of the tank 2). A plurality of them are provided at intervals in the width direction (for example, at positions corresponding to both ends of the plate member 32 in the width direction). In this way, when an earthquake occurs, the walkway 31, which is the plate-like member 32, slides on the upper surface of the outer walkway 3 of the tank 2 by the sliding part 34, and the boarding walkway 31 is moved between the tank 2 and the walkway 31. It is spanned over the tank 2 in a manner that suppresses the transmission of horizontal force during an earthquake, without using any connecting materials.

図４及び図５では、新設外階段１１における踊り場部分１６の横側部の近傍箇所に、タンク２の外周歩廊３が存在する場合に、その外周歩廊３に対する乗り込み歩廊３１を示しているが、タンク２の上下方向では、外周歩廊３が存在する位置が異なっている。例えば、図６に示すように、タンク２の外周歩廊３が新設外階段１１における踊り場部分１６から離れた箇所に、タンク２の外周歩廊３が存在する場合がある。ちなみに、図６では、外周歩廊３に対して昇降するための梯子７が、外周歩廊３の端部に近接する状態で備えられている。 4 and 5 show the boarding walkway 31 for the outer walkway 3 of the tank 2 when the outer walkway 3 of the tank 2 is present near the lateral side of the landing portion 16 of the new external staircase 11. In the vertical direction of the tank 2, the positions where the outer circumferential walkway 3 exists are different. For example, as shown in FIG. 6, the outer circumferential walkway 3 of the tank 2 may exist at a location away from the landing portion 16 of the new exterior staircase 11. Incidentally, in FIG. 6, a ladder 7 for going up and down the outer circumferential walkway 3 is provided in a state close to an end of the outer circumferential walkway 3.

そこで、このような外周歩廊３に対しても、作業者が乗り込みできるように、乗り込み歩廊として、歩廊３１に加えて、跳ね出し歩廊４０が構築されている。第２梁材１８ｂや連結材１９等から水平方向に跳ね出す状態で複数の延設部材３７を備え、その延設部材３７の上部に床板部材３８を配置することで、新設外階段１１における踊り場部分１６からの跳ね出し歩廊４０を構築している。図６は、図４と同様に、歩廊３１、タンク２の外周歩廊３、新設外階段１１の踊り場部分１６等を下方側から見た図である。図６に示すものでは、複数の延設部材３７及び床板部材３８を組み合わせて、平面視でＬ字状の跳ね出し歩廊４０が構築されている。図６に示すものでは、跳ね出し歩廊４０及び歩廊３１にて、新設外階段１１における踊り場部分１６からタンク２の外周歩廊３に作業者等が乗り込み可能に構成されている。 Therefore, in addition to the walkway 31, a jump-out walkway 40 is constructed as a boarding walkway for such an outer walkway 3 so that workers can board the same. By providing a plurality of extending members 37 that protrude horizontally from the second beam member 18b, connecting member 19, etc., and arranging the floor plate member 38 on the upper part of the extending members 37, the landing area of the new external staircase 11 can be improved. A protruding walkway 40 from the section 16 is being constructed. Similar to FIG. 4, FIG. 6 is a view of the walkway 31, the outer walkway 3 of the tank 2, the landing portion 16 of the new external staircase 11, etc., viewed from the lower side. In the example shown in FIG. 6, a plurality of extending members 37 and floor plate members 38 are combined to construct an L-shaped protruding walkway 40 in plan view. In the structure shown in FIG. 6, a jump-out walkway 40 and a walkway 31 are configured so that a worker or the like can get onto the outer walkway 3 of the tank 2 from a landing portion 16 of the new exterior staircase 11.

跳ね出し歩廊４０の先端部には、タンク２側に跳ね出した平面視で台形状の板状部材３９（例えば、鋼板）が備えられ、この板状部材３９にて外周歩廊３への乗り込み歩廊３１が構築されている。板状部材３９におけるタンク２側には、図４の板状部材３２と同様に、板状部材３９の長さ方向（跳ね出し歩廊４０の先端部からタンク２の外周歩廊３に向かう水平方向に沿う方向）に延設された状態で、板状部材３９の横幅方向に間隔を隔てた複数の滑り部３４が備えられ、板状部材３２である歩廊３１は、滑り部３４を介してタンク２の外周歩廊３に当接させる状態でタンク２の外周歩廊３に架け渡されている。板状部材３９である歩廊３１は、タンク２の外周歩廊３よりも高い位置に配置されており、歩廊３１の下面部がタンク２の外周歩廊３の上面部に当接可能に備えられている。 At the tip of the protruding walkway 40, a plate-like member 39 (for example, a steel plate) that is trapezoidal in plan view is provided that protrudes toward the tank 2 side, and this plate-like member 39 is used to provide a boarding walkway to the outer circumferential walkway 3. 31 have been constructed. On the tank 2 side of the plate member 39, as in the plate member 32 of FIG. A plurality of sliding portions 34 are provided at intervals in the width direction of the plate-like member 39 , and the walkway 31 , which is the plate-like member 32 , is extended in the direction along the tank 2 through the sliding portions 34 . The tank 2 is spanned over the outer walkway 3 of the tank 2 so as to be in contact with the outer walkway 3 of the tank 2. The walkway 31, which is a plate-like member 39, is arranged at a higher position than the outer walkway 3 of the tank 2, and is provided so that the lower surface of the walkway 31 can come into contact with the upper surface of the outer walkway 3 of the tank 2. .

新設外階段１１は、図２に示すように、繋ぎ材を介することなく、独立して自立可能とする基礎部２１を備えている。基礎部２１は、タンク２の既存基礎部５の上部に構築され、図１及び図２に示すように、その一部（上方側）が地面Ｇよりも上方側の地上に配置されたＲＣ基礎部にて構成されている。基礎部２１において地上に配置された地上基礎部位２１ａには、柱材１７の下端部が埋設されており、柱材１７が、基礎部２１から上方側に延びる立設状態で構築されている。地上基礎部位２１ａには、図１及び図３に示すように、新設外階段１１における階段部分１５の一部が備えられている。地上基礎部位２１ａには、図３に示すように、地上からの最下段の階段部分１５ａが備えられ、その階段部分１５ａに引き続く状態で地上基礎部位２１ａの上面部が配置されている。新設外階段１１において最下位に位置するささら桁１３の下端部は、地上基礎部位２１ａに固定連結されている。 As shown in FIG. 2, the new external staircase 11 is equipped with a base part 21 that allows it to stand on its own without any connecting material. The foundation part 21 is an RC foundation constructed on top of the existing foundation part 5 of the tank 2, and a part (upper side) thereof is placed on the ground above the ground G, as shown in FIGS. 1 and 2. It is made up of three parts. The lower end of a column 17 is buried in an above-ground foundation part 21a arranged on the ground in the foundation 21, and the column 17 is constructed in an upright state extending upward from the foundation 21. As shown in FIGS. 1 and 3, the above-ground foundation portion 21a is provided with a part of the stair portion 15 of the new external staircase 11. As shown in FIG. 3, the above-ground foundation part 21a is provided with the lowest stair portion 15a from the ground, and the upper surface of the above-ground foundation part 21a is arranged in a state continuing from the stair part 15a. The lower end portion of the stringer 13 located at the lowest position in the new external staircase 11 is fixedly connected to the above-ground foundation portion 21a.

新設外階段１１の基礎部２１は、図２に示すように、後施工に取り付けられるアンカー部材６等により、既存基礎部５に接続されている。アンカー部材６の取付箇所は適宜変更可能であり、図２に示すものでは、上下方向で基礎部２１と既存基礎部５とを接続するようにアンカー部材６を取り付けているが、例えば、水平方向で基礎部２１と既存基礎部５とを接続するようにアンカー部材６を取り付けることもできる。 As shown in FIG. 2, the foundation 21 of the new exterior staircase 11 is connected to the existing foundation 5 by an anchor member 6 or the like that will be attached during post-construction. The attachment location of the anchor member 6 can be changed as appropriate; in the one shown in FIG. 2, the anchor member 6 is attached so as to connect the foundation part 21 and the existing foundation part 5 in the vertical direction; The anchor member 6 can also be attached so as to connect the foundation part 21 and the existing foundation part 5.

〔別実施形態〕
（１）上記実施形態では、歩廊３１を、滑り部３４を介してタンク２の外周歩廊３に当接させる状態でタンク２に架け渡すことで、地震時の水平力の新設外階段１１からタンク２への伝達を抑制しているが、滑り部に限るものではなく、歩廊としては、地震時の水平力の新設外階段１１からタンク２への伝達を抑制する状態で、新設外階段１１からタンク２側に架け渡すものであればよい。 [Another embodiment]
(1) In the above embodiment, by spanning the tank 2 with the walkway 31 in contact with the outer walkway 3 of the tank 2 via the sliding part 34, the horizontal force at the time of an earthquake can be applied to the tank from the newly constructed external stairs 11. However, this is not limited to the sliding part, and as a walkway, the transmission of horizontal force from the new external stairs 11 to the tank 2 during an earthquake is suppressed. It may be anything that can be bridged over the tank 2 side.

（２）上記実施形態では、既設建物として、ガス等の危険物を保管するタンク２を適用した例を示しているが、その他各種の建物を適用することができる。 (2) In the above embodiment, an example is shown in which a tank 2 for storing dangerous substances such as gas is applied as an existing building, but various other buildings can be applied.

１ 乗り込み用構造物
２ タンク（既存建物）
５ 既存基礎部
６ アンカー部材
１１ 新設外階段
１２ 階段部材
１５ａ 階段部分
２１ 基礎部
３１ 歩廊
３４ 滑り部

1 Boarding structure 2 Tank (existing building)
5 Existing foundation part 6 Anchor member 11 New external staircase 12 Stair member 15a Stair part 21 Foundation part 31 Walkway 34 Sliding part

Claims (3)

既存建物に対する新設外階段と、
前記新設外階段における階段部材からの跳ね出しにより構築された歩廊とが備えられ、
前記歩廊は、前記既存建物と前記新設外階段との間に架け渡して、前記新設外階段から前記既存建物への乗り込み歩廊として備えられ、
前記乗り込み歩廊は、前記既存建物との間に繋ぎ材を介することなく、地震時の水平力の伝達を抑制する状態で前記既存建物に架け渡され、
前記乗り込み歩廊は、前記既存建物の架け渡される部位よりも高い位置に配置され、前記既存建物に対して長期荷重による鉛直力が伝達されるのを抑制する状態で前記階段部材に片持ち支持され、
前記乗り込み歩廊の下面部には、前記既存建物の架け渡される部位の上面部に当接する滑り部が間隔を隔てて複数備えられ、複数の滑り部の全てが、前記既存建物の上面部に直接当接している既存建物への乗り込み用構造物。 New external stairs for existing buildings;
a walkway constructed by protruding from the stair member in the new external staircase;
The walkway spans between the existing building and the new external staircase, and is provided as a boarding walkway from the new external staircase to the existing building,
The boarding walkway is spanned over the existing building in a manner that suppresses the transmission of horizontal force during an earthquake, without intervening a connecting material between the boarding walkway and the existing building,
The boarding walkway is located at a higher position than the part of the existing building to be spanned over, and is cantilevered by the stairway member in a manner that suppresses vertical force due to long-term loads from being transmitted to the existing building. ,
The lower surface of the boarding walkway is provided with a plurality of sliding parts at intervals that contact the upper surface of the part of the existing building to be bridged, and all of the plurality of sliding parts are directly connected to the upper surface of the existing building. A structure for accessing an existing building that is in contact with it. 前記新設外階段は、繋ぎ材を介することなく、独立して自立可能とする基礎部を備え、その基礎部に階段部分の一部が備えられている請求項１に記載の既存建物への乗り込み用構造物。 2. The method for entering an existing building according to claim 1, wherein the newly constructed external staircase has a foundation that can stand on its own without using any connecting materials, and the foundation has a part of the stairway. Structures for use. 前記新設外階段の基礎部は、前記既存建物の既存基礎部に接続されている請求項１又は２に記載の既存建物への乗り込み用構造物。 The structure for boarding into an existing building according to claim 1 or 2, wherein a foundation portion of the new external staircase is connected to an existing foundation portion of the existing building.
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