Construction elevator installation structure for seismically isolated buildings

Abstract

To provide a technique capable of avoiding damage to a fixed portion of a support member to an upper skeleton while adopting a rational and low-cost configuration in a work elevator installing structure of a base isolation building.SOLUTION: A work elevator installing structure 10 of a base isolation building 1 provided in the base isolation building 1 having a base isolation device 5 interposed between a lower skeleton 2 and an upper skeleton 3, comprises: a support member 20 having a fixed portion 20A fixed to the upper skeleton 3 and extending from the fixed portion 20A toward an outer end portion 20a located outside the base isolation building 1 to support a cradle 42 of a work elevator 40 that is installed outside the base isolation building 1; and a bearing member 30 installed on a ground 8 outside the base isolation building 1 and bearing the support member 20 from below in a horizontally movable state. In the support member 20, a bearing point 20C by the bearing member 30 is located closer to the outer end portion 20a than a support point 20B of the cradle 42 of the work elevator 40.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a construction elevator installation structure for a seismically isolated building, in which a seismic isolation device is installed between a lower frame and an upper frame. [Background technology]

[0002] A known conventional construction elevator installation structure for a seismically isolated building is one that is installed in a seismically isolated building that has a seismic isolation device interposed between a lower frame and an upper frame, and includes a support member that has a fixed part fixed to the upper frame and extends from the fixed part toward an outer end located outside the seismically isolated building to support the frame of the construction elevator that is installed outside the seismically isolated building, and a support member that is installed on the ground outside the seismically isolated building and supports the support member from below in a state where it can move horizontally freely (see, for example, Patent Document 1). Furthermore, in the construction elevator installation structure for a seismically isolated building described in Patent Document 1, the support point of the support member by the support member is located directly below the support point of the construction elevator's base, and part of the construction elevator's base is supported on the protruding part that protrudes outward from the support point toward the outer end. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2008-291859 Summary of the Invention [Problem to be solved by the invention]

[0004] In the construction elevator installation structure for a seismically isolated building described in Patent Document 1, part of the load of the construction elevator and its platform acts on the protruding portion of the support member that is closer to the outer end than the support point. This can cause a rotational moment to act on the support member, with the outer end point facing downward and the fixed portion facing upward, with the support point as the fulcrum. This rotational moment generates a pull-out force at the fixed portion of the support member, which is fixed in contact with the upper structure from above, that tends to separate the fixed portion from the upper structure. This pull-out force can damage the fixed portion, the anchor bolts, etc. Furthermore, if the support member is firmly fixed to the upper structure to avoid such damage, this can result in a complex structure and increased costs. In view of this situation, the main objective of the present invention is to provide a technology for installing elevators for construction work in seismically isolated buildings that can avoid damage to the fixing parts of the support members to the upper structure while adopting a rational and low-cost configuration. [Means for solving the problem]

[0005] The first characteristic configuration of the present invention is provided for a seismically isolated building having a seismic isolation device interposed between a lower skeleton and an upper skeleton, a support member having a fixed portion fixed to the upper body and extending from the fixed portion toward an outer end portion located outside the seismic isolated building to support a frame of a construction elevator installed outside the seismic isolated building; A support member is installed on the ground outside the seismic isolated building and supports the support member from below in a horizontally movable state. In the support member, a support point supported by the support member the outermost edge of is the support point of the construction elevator frame the outermost edge of The point is that it is located closer to the outer end than the outer end.

[0006] According to this configuration, in the support member that supports the construction elevator platform outside the seismically isolated building, the support points of the support members are located closer to the outer end of the support member, opposite the fixed part of the support member, than the support points of the construction elevator platform. This allows the load of the construction elevator and the platform transmitted from the construction elevator platform to the support member to be appropriately distributed as a downward force between the support points of the support members and the fixed part to the upper frame. As a result, a downward force is always applied from the fixed part of the support member to the upper frame that supports it from below, which prevents an upward force from being applied from the fixed part to the upper frame, thereby appropriately preventing damage to the fixed part, the upper frame, and the connectors that connect them, which would be caused by the upward force. Therefore, the present invention provides a technology that can adopt a rational and low-cost configuration for installing elevators for construction work in seismically isolated buildings, while avoiding damage to the fixing parts of the support members to the upper structure.

[0007] A second characteristic feature of the present invention is that the bearing member is composed of a sliding bearing member that extends in a horizontal direction intersecting the extending direction of the support member and that comes into sliding contact with the lower surface of the support member.

[0008] According to this configuration, the extension direction of the sliding bearing member constituting the bearing member intersects with the extension direction of the support member whose underside the sliding bearing member contacts in plan view, thereby minimizing the area of ​​the sliding contact surface between the support member and the sliding bearing member, making it easier to control the surface precision of the sliding contact surface.

[0009] A third characteristic configuration of the present invention is that the support member is composed of a pair of support beams arranged side by side, The sliding bearing member is provided across the pair of support beams.

[0010] According to this configuration, the support member is made up of a pair of support beams, so the pair of support beams can stably support the construction elevator platform. Furthermore, because the sliding bearing members are provided across the pair of support beams, the pair of support beams can be supported evenly under the same conditions by the same sliding bearing members while simplifying the configuration.

[0011] A fourth characteristic configuration of the present invention is that the fixing portion of the support member is fixed by an anchor bolt embedded in the first floor slab in a state in which it is abutted from above against the first floor slab of the upper structure.

[0012] With this configuration, a downward force is always applied from the fixed part of the support member to the first floor slab that supports it from below, thereby avoiding the generation of a pull-out force that would move the fixed part upward away from the first floor slab, and appropriately preventing damage to the fixed part, the first floor slab, and the anchor bolts that connect them that would be caused by this pull-out force. Furthermore, since the support points of the support members are located closer to the outer end than the support points of the construction elevator's frame, construction of the protruding portion of the first floor slab that extends toward the outside of the seismically isolated building can be carried out appropriately while avoiding interference with the support members. [Brief explanation of the drawings]

[0013] [Figure 1] Front view showing the installation of a construction elevator in a seismically isolated building [Figure 2] Side view of the elevator installation structure for construction work in a seismically isolated building [Figure 3] Plan view of the construction elevator installation structure in a seismically isolated building [Figure 4] Front view of the elevator installation structure for construction work in a seismically isolated building DETAILED DESCRIPTION OF THE INVENTION

[0014] An embodiment of the present invention will be described with reference to the drawings. As shown in Figures 1 and 2, in new construction of a seismically isolated building 1 having a seismic isolation device 5 interposed between a lower skeleton 2 and an upper skeleton 3, a construction elevator 40 is installed outside along the outer wall surface of the seismically isolated building 1. The construction elevator installation structure (hereinafter referred to as "this installation structure") 10 of this embodiment is constructed to support the construction elevator 40 installed outside the seismically isolated building 1, while being able to move horizontally together with the upper skeleton 3 of the seismically isolated building 1. In this embodiment, the lower skeleton 2 is configured as the foundation, but it may also be, for example, an underground skeleton constructed underground.

[0015] In this embodiment, the construction elevator 40 is a two-section type, as shown in Figure 1, in which a carrier 45 having a car body and a drive frame for accommodating transported goods and people is raised and lowered by two lifting masts 41 arranged on both sides of the carrier. However, it may also be a single-section type in which the carrier is raised and lowered by a single lifting mast arranged on the rear side.

[0016] As shown in FIGS. 2, 3 and 4, a platform 42 is attached to the lower end of each lifting mast 41, and each of these platforms 42 is installed on the installation structure 10. The bases 42 of the two lifting masts 41 are connected to each other by a base connecting frame 43. In addition, each base 42 of the two lifting masts 41 is provided with a shock absorber 48 for absorbing the impact when the carrier 45 lands on the floor. The installation structure 10 is configured to include a support member 20 and a bearing member 30, and details of each will be described below with reference to FIGS. 2, 3 and 4.

[0017] The support member 20 has a fixed portion 20A fixed to the upper surface of the first-floor slab 4, which is constructed in a state where it protrudes outward from the upper frame 3 of the seismically isolated building 1. The support member 20 is composed of a support beam 21 made of an H-shaped steel that extends from the fixed portion 20A along a support member extension direction X, which is a horizontal direction toward an outer end 20a (left end in FIGS. 2 and 3 ) located outside the seismically isolated building 1. The support member 20 is further composed of a pair of support beams 21 arranged parallel to each other in a direction perpendicular to the support member extension direction X in a plan view. Note that in this embodiment, the support beam 21 extends linearly from the fixed portion 20A along the support member extension direction X, which is a horizontal direction. However, it is sufficient that the support beam 21 extends from the fixed portion 20A toward the outer end 20a located outside the seismically isolated building 1. For example, the support beam 21 may not be straight along the horizontal direction but may have some steps or inclinations. Each platform 42 in the construction elevator 40 is placed on the upper surface of a support point 20B located outside the seismically isolated building 1 on a pair of support beams 21 and is stably supported by the pair of support beams 21.

[0018] The fixed portion 20A of each support beam 21 is fixed in a state of abutting from above against the first floor slab 4 of the upper frame 3 inside the seismically isolated building 1. More specifically, a gusset plate 24 is joined to the lower flange of the fixed portion 20A of the support beam 21 in a position extending laterally, and is joined by an anchor bolt 25 serving as a fixing device embedded in the first floor slab 4, thereby fixing the fixed portion 20A of the support beam 21 to the upper surface of the first floor slab 4. Furthermore, mortar 26 for level adjustment is interposed between the lower surface of the support beam 21 at the fixed portion 20A and the upper surface of the first floor slab 4.

[0019] The bearing member 30 is configured to support the support member 20 from below in a state where it can move horizontally freely, and is installed on leveling concrete 9 laid on the ground 8 outside the base-isolated building 1. Furthermore, the bearing member 30 is made of an H-shaped steel that extends across a pair of support beams 21 in a bearing member extension direction Y, which is a horizontal direction perpendicular to the support member extension direction X, and is configured with sliding bearing members 31 that slide against the undersides of the pair of support beams 21 that serve as the support member 20. That is, the bearing member extension direction Y in which the sliding bearing members 31 extend is perpendicular to the support member extension direction X in which the pair of support beams 21, whose undersides the sliding bearing members 31 slide against, extend in a plan view. This configuration minimizes the area of ​​the sliding contact surface between each support beam 21 and the sliding bearing member 31, making it easier to control the surface precision of the sliding contact surface. Furthermore, since the sliding bearing member 31 is provided across the pair of support beams 21, the pair of support beams 21 can be supported evenly under the same conditions by the same sliding bearing member 31 while simplifying the configuration.

[0020] A plate-shaped sliding member 28 made of an engineering plastic or the like, which has excellent abrasion resistance and self-lubricating properties, is attached to the underside of each of the pair of support beams 21, and a stainless steel plate 33, which comes into smooth sliding contact with the sliding member 28, is attached to the upper surface of the sliding support member 31. With this configuration, the sliding support member 31 smoothly supports the sliding support with respect to the support beam 21, and the durability of this sliding contact surface is improved. Furthermore, the sliding surface, which is the underside of the support beam 21 and the upper surface of the sliding support member 31 that slides against it, is raised above the ground 8, protecting the sliding surface and ensuring sliding performance. Also, since a space is formed between the ground 8 and the tip of the support beam 21 that is outside the sliding support member 31, the space below the tip of the support beam 21 can be used effectively, for example, when the site is narrow, to place support material for supporting a temporary fence in the space below the tip of the support beam 21, etc.

[0021] The installation structure 10 employs a rational and low-cost configuration, while also employing a configuration that avoids damage to the fixing portion 20A of the support beam 21 relative to the first floor slab 4 of the upper structure 3. That is, in each support beam 21, the support point 20C of the sliding bearing member 31 is located closer to the outer end 20a than the support point 20B of the platform 42 of the construction elevator 40, outside the seismically isolated building 1. Specifically, in the support beam 21, the edge of the support point 20C of the sliding bearing member 31 on the outermost end 20a side is located closer to the outer end 20a than the edge of the support point 20B of the platform 42 of the construction elevator 40 on the outermost end 20a side. With this configuration, the load of the construction elevator 40 and the platform 42 transmitted from the platform 42 of the construction elevator 40 to each support beam 21 is appropriately distributed as a downward force to the support point 20C of the sliding bearing member 31 and the fixed part 20A to the first floor slab 4. As a result, a downward force is constantly applied from the fixed portion 20A of the support member 20 to the first floor slab 4 that supports it from below. This avoids the generation of a pull-out force that would move the fixed portion 20A upward away from the first floor slab 4, and appropriately prevents damage to the fixed portion 20A, the first floor slab 4, and the anchor bolts 25 that join them that would otherwise be caused by this pull-out force.

[0022] Furthermore, in the support beam 21, the support point 20C by the sliding bearing member 31 is located closer to the outer end 20a than the support point 20B of the platform 42 of the construction elevator 40, so that the protruding portion 4a of the first floor slab 4 that faces the outside of the seismically isolated building 1 can be constructed appropriately while avoiding interference with the sliding bearing member 31. Also, the position of the fixing portion 20A on the top surface of the first floor slab 4 is not at the protruding portion 4a but directly above the beam and seismic isolation device 5 that support the first floor slab 4, in order to firmly support the load received from the fixing portion 20 while avoiding damage to the first floor slab 4.

[0023] [Another embodiment] Other embodiments of the present invention will be described below. Note that the configurations of the embodiments described below are not limited to being applied independently, but can also be applied in combination with the configurations of other embodiments.

[0024] (1) In the above embodiment, the support member extension direction X, which is the extension direction of the support member 20, and the support member extension direction Y, which is the extension direction of the H-shaped steel that constitutes the sliding bearing member 31, are perpendicular to each other in a planar view. However, the support member extension direction X and the support member extension direction Y may intersect in a planar view.

[0025] (2) In the above embodiment, the bearing member 30 that supports the support member 20 from below while allowing it to move horizontally freely is the sliding bearing member 31 that comes into sliding contact with the underside of the support member 20, but it is also possible to use a bearing member of another form, such as a rubber bearing. Also, in the above embodiment, the sliding bearing member 31 is made of an H-shaped steel, but this sliding bearing member 31 may be made of another steel material as long as it extends along the bearing member extension direction Y.

[0026] (3) In the above embodiment, the support member 20 supporting the platform 42 of the construction elevator 40 is composed of a pair of support beams 21 made of H-shaped steel arranged side by side, but this support member 20 may be any member that extends along the support member extension direction X, and may be composed of other steel materials, etc.

[0027] (4) In the above embodiment, the fixing portion 20A of the support member 20 is fixed by an anchor bolt 25 embedded in the first floor slab 4 of the upper structure 3 while being abutted from above against the first floor slab 4. However, the method of fixing the support member 20 to the upper structure 3 can be changed as appropriate, and the fixing portion 20A of the support member 20 may be fixed to a location other than the first floor slab 4 of the upper structure 3. [Explanation of symbols]

[0028] 1. Earthquake-resistant building 2 Lower structure 3 Upper frame 5 Seismic isolation device 8 Ground 10. Construction elevator installation structure 20 Support member 20A fixed part 20B Support point 20C Support point 20a outer end 21 Support beam 25 anchor bolt 30 Support member 31 Sliding bearing member 40 Construction Elevator 42 Mounting stand

Claims

1. It is provided for a seismically isolated building in which a seismic isolation device is interposed between a lower frame and an upper frame, a support member having a fixed portion fixed to the upper frame and extending from the fixed portion toward an outer end portion located outside the seismic isolated building to support a frame of a construction elevator installed outside the seismic isolated building; A construction elevator installation structure for a seismically isolated building, comprising: a support member that is installed on the ground outside the seismically isolated building and supports the support member from below in a horizontally movable state; A construction elevator installation structure for a seismically isolated building, in which the outermost edge of the support point of the support member is located closer to the outer end than the outermost edge of the support point of the construction elevator's platform.

2. The construction elevator installation structure for a seismically isolated building as described in claim 1, wherein the support member is composed of a sliding support member extending in a horizontal direction intersecting the extension direction of the support member and in sliding contact with the underside of the support member.

3. The support member is composed of a pair of support beams arranged side by side, 3. The elevator installation structure for construction work in a seismically isolated building according to claim 2, wherein the sliding support member is provided across the pair of support beams.

4. A construction elevator installation structure for a seismically isolated building as described in any one of claims 1 to 3, wherein the fixing portion of the support member is fixed by an anchor bolt embedded in the first floor slab in a state of being abutted from above against the first floor slab of the upper structure.

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