JP5232106B2 - Construction method of seismic isolation structure - Google Patents

Description

  The present invention relates to a method for constructing a base isolation structure.

  In recent years, in various types of structures, by installing seismic isolation devices on the foundations of the structures, etc., the vibrations that are about to propagate from the ground to the structures due to earthquakes, etc. are attenuated, and are generated in the structures of the structures. Seismic isolation structures that reduce stress and deformation have been developed.

  A general seismic isolation structure is constructed as follows. First, before installing the reinforcement of the lower base of the seismic isolation device (base isolation base) and the formwork, attach the anchor frame for attaching the lower base plate, install the lower base plate on this frame, and put the concrete for the lower base To cast. This concrete is generally constructed by press-fitting high-fluidity concrete or non-shrink mortar in order to ensure fillability at the lower end of the lower base plate. After that, the mold is removed, and the seismic isolation device is fastened to the lower base plate with bolts. Then, after the upper base plate is fastened to the seismic isolation device with bolts, the upper base reinforcement of the seismic isolation device and the formwork are installed, and concrete for the upper foundation is placed (see Non-Patent Document 1). After that, the superstructure is constructed as usual.

  Such a seismic isolation structure construction method is a general construction method for basic seismic isolation work, in which each part is assembled sequentially. Therefore, since the time of each process is accumulated, it takes a lot of time and the construction period cannot be shortened. Furthermore, it takes time and labor to produce an anchor frame for installing the seismic isolation device.

  In order to solve the above problems, for example, a basic structure as shown in Patent Document 1 has been developed. This foundation structure is built on the top of the pile, and the cap ring (for the pile head) formed at the bottom of the seismic isolation device and the lower rising foundation are integrally formed with precast concrete. is there. According to such a configuration, it is possible to sequentially install the seismic isolation device and construct the upper foundation without waiting for the curing period of the lower rising foundation, and shorten the construction period of the seismic isolation related work.

Japanese Patent Laid-Open No. 2006-291641

“JSSI Seismic Isolation Structure Construction Standard” by the Japan Seismic Isolation Structure Association, published by the Economic Research Council, published on July 15, 2005

  However, in the configuration of Patent Document 1 described above, the curing period of the lower rising foundation can be omitted, but the subsequent installation of the seismic isolation device and the construction of the upper foundation must be performed at the construction site, leaving room for shortening the construction period. It had been.

  In addition, the bottom of the lower base plate for mounting the seismic isolation device needs to transmit the stress of the seismic isolation member to the lower structure with certainty. Need to be filled as densely as possible. Therefore, in general, the filling property is often secured by press-fitting the lower base plate using high fluidity concrete having high self-filling property and little bleeding. However, for that purpose, special high-fluidity concrete blending plan, test kneading, and press-fitting construction test are required, which requires much time, labor and cost, and improvement has been demanded.

  Therefore, the present invention has been devised to solve the above-mentioned problems, and can be easily constructed without using a high-fluidity concrete press-in method when constructing a lower rising foundation or an upper foundation, and shortening the construction period. It is an object of the present invention to provide a construction method for a seismic isolation structure that can achieve this.

  In order to solve the above-mentioned problems, the present invention integrates a seismic isolation device, an upper foundation made of precast concrete, and a lower rising foundation made of precast concrete manufactured upside down. Manufacturing process for pre-forming the base isolation assembly, the base isolation assembly installation step for installing the base isolation assembly on the ground side floor slab, and the upper base of the base isolation assembly And a column base part connecting step for connecting the column base parts.

  According to such a method, the upper foundation and the lower rising foundation are precast and integrated with the seismic isolation device in advance to form the seismic isolation assembly. Installation and curing can be omitted. As a result, the number of work steps at the construction site can be greatly reduced, and the construction period can be shortened. Especially when the upper column / beam structure is a dry structure such as S structure or PC structure, there is no need to wait for the remaining structure of the seismic isolation upper foundation, the work of the beam structure to connect it, and the work of the floor structure on the beam. 、 Because it is possible to work on the columns, beams, and floor frames on the upper floors, the construction period can be further shortened.

  Further, the present invention is characterized in that, in the seismic isolation assembly manufacturing process, after the upper foundation and the lower rising foundation are manufactured, they are respectively connected to and integrated with the seismic isolation device.

  Further, according to the present invention, of the surfaces of the upper foundation and the lower rising foundation, a surface in contact with the seismic isolation device is formed with a concrete surface, and a lower flange plate of the seismic isolation device is formed on the lower rising foundation. While making it contact with a concrete surface directly or through a grout material, the upper flange plate of the said seismic isolation apparatus is made to contact the said concrete surface of the said upper foundation directly or through a grout material.

  According to such a method, since the upper flange plate and the lower flange plate of the seismic isolation device are brought into contact with the concrete surfaces of the upper foundation and the lower rising foundation, respectively, there is no need to provide a base plate as in the prior art. Can achieve down.

  The present invention also provides a lower rising foundation composed of precast concrete manufactured in an upside down state on the ground side floor slab, and a seismic isolation device is installed on the lower rising foundation. It is a construction method of a base-isolated structure characterized by installing an upper foundation composed of precast concrete on a seismic device.

  According to such a method, since the upper foundation and the lower rising foundation are precast, the concrete placement and curing of the lower rising foundation and the upper foundation can be omitted at the construction site, and as a result, the number of work processes at the construction site. The construction period can be shortened.

  Further, the present invention provides a seismic isolation device integrated with the above-mentioned seismic isolation device by forming a lower rising foundation mold on the seismic isolation device, and placing concrete in the mold to produce a lower rising foundation. A base-isolated assembly is pre-formed by turning the lower rising foundation upside down to form an upper foundation mold on the seismic isolation device and placing concrete into the mold to produce the upper foundation. The base-isolating assembly manufacturing process, the base-isolating assembly installation process for installing the base-isolating assembly on the ground-side floor slab, and the column that connects the column base to the upper foundation of the base-isolating assembly A method for constructing a seismic isolation structure, comprising: a leg connecting step.

  According to such a method, the lower rising foundation and the upper foundation are sequentially precast on the seismic isolation device and integrated with the seismic isolation device to form a seismic isolation assembly in advance. In addition, it is possible to omit the concrete placement and curing of the upper foundation, the number of work steps at the construction site can be greatly reduced, and the construction period can be shortened.

  According to the present invention, the construction can be shortened because the construction can be easily performed without using the press-fitting method of the high fluidity concrete when the lower rising foundation is constructed. Further, it is not necessary to use expensive high-fluidity concrete, test kneading is unnecessary, and a dedicated tool for press-fitting is not required, so that the cost can be reduced.

It is sectional drawing for demonstrating the seismic isolation assembly manufacturing process of the construction method of the base isolation structure which concerns on 1st embodiment of this invention, Comprising: (a) is the figure which showed the state which manufactures a lower standing foundation, b) is a diagram showing a state of manufacturing the upper foundation. It is sectional drawing for demonstrating the seismic isolation assembly manufacturing process of the construction method of the seismic isolation structure which concerns on 1st embodiment of this invention, Comprising: The state which unifies a lower rising foundation, a seismic isolation foundation, and an upper foundation is shown. It is a figure. It is sectional drawing for demonstrating the seismic isolation assembly installation process of the construction method of the base isolation structure which concerns on 1st embodiment of this invention. The step of fixing the base isolation assembly to the floor slab after the base isolation assembly installation step of the method for constructing the base isolation structure according to the first embodiment of the present invention and the column base when the upper column / beam is a dry structure It is sectional drawing for demonstrating the process of fixing to a seismic isolation assembly. It is sectional drawing which showed the state which connected the footing, the beam, and the floor to the column base part fixed to the seismic isolation structure. It is sectional drawing which showed the modification of the seismic isolation assembly. It is sectional drawing for demonstrating the modification of the installation state to the floor slab of a seismic isolation assembly. It is sectional drawing for demonstrating the further modification of the installation state to the floor slab of a seismic isolation assembly. It is sectional drawing for demonstrating the seismic isolation assembly manufacturing process of the construction method of the base isolation structure which concerns on 3rd embodiment of this invention, Comprising: (a) is the figure which showed the state which manufactures a lower standing foundation, ( b) is a diagram showing a state of manufacturing the upper foundation. It is sectional drawing for demonstrating the base isolation assembly manufacturing process of the construction method of the base isolation structure which concerns on 3rd embodiment of this invention, Comprising: It is the perspective view which showed the state which manufactures a lower standing foundation. It is sectional drawing for demonstrating the seismic isolation assembly manufacturing process of the construction method of the seismic isolation structure which concerns on 3rd embodiment of this invention, Comprising: The state which unifies a lower rising foundation, a seismic isolation foundation, and an upper foundation is shown. It is a figure. Explains the steps of fixing the base isolation assembly to the floor slab and the step of fixing the column base to the base isolation assembly after the base isolation assembly installation step of the base isolation structure construction method according to the third embodiment of the present invention. It is sectional drawing for doing.

(First embodiment)
A first embodiment of a seismic isolation structure building method according to the present invention will be described in detail with reference to the accompanying drawings.

  The construction method of the seismic isolation structure 1 (refer FIG. 5) which concerns on 1st embodiment is the base isolation device 10 (refer FIG. 2), the upper foundation 20 (refer FIG. 2) comprised with the precast concrete, and upside down. A base-isolated assembly that pre-forms a base-isolated assembly 2 (see FIG. 3 and FIG. 4) by integrating a lower rising foundation 30 (see FIG. 2) made of precast concrete manufactured in an orientation. Manufacturing process, seismic isolation assembly installation process for installing the seismic isolation assembly 2 on the ground side floor slab 3 (hereinafter sometimes referred to simply as “floor slab 3”), and the upper base of the seismic isolation assembly 2 20 is provided with a column base portion connecting step of connecting the column base portion 4 to the column base portion 4. In the seismic isolation assembly manufacturing process in the first embodiment, after the upper foundation 20 and the lower rising foundation 30 are manufactured, they are connected to the seismic isolation device 10 and integrated.

  Below, each process for building the seismic isolation structure 1 is demonstrated in detail.

(Seismic isolation assembly manufacturing process)
The seismic isolation assembly manufacturing process includes a lower rising foundation manufacturing process for manufacturing the lower rising foundation 30, an upper foundation manufacturing process for manufacturing the upper foundation 20, and the lower rising foundation 30, the seismic isolation device 10, and the upper foundation 20. Assembly process. This process is carried out by building hills in the work space of the factory or construction site.

  As shown in FIG. 1 (a), when the lower rising foundation 30 is manufactured, the lower base plate 31 is laid on the floor surface at the work position with the lower base plate 31 turned upside down from the construction completion state. A mold frame 32 is formed on the lower base plate 31, and concrete is cast from the upper side of the lower base plate 31 to form precast concrete (precast concrete product). At this time, since the concrete is placed upside down, even if it is ordinary concrete, it is possible to easily ensure the filling ability around the lower base plate 31 by carefully compacting the concrete with a vibrator. Can do.

  The lower base plate 31 is a member that comes into contact with the lower flange plate 11 of the seismic isolation device 10 (see FIG. 2), and has a planar shape that is the same as or slightly larger than the lower flange plate 11 (in this embodiment, one larger). (Circle). The shapes of the lower flange plate 11 and the lower base plate 31 are not limited to a circle, and may be other shapes such as a square. The lower base plate 31 is disposed so as to be exposed on the upper surface of the lower rising foundation 30, and the contact surface 31a (the upper surface in the construction completion state) is formed smoothly. The contact surface 31a faces downward in FIG. A bolt through hole (not shown) is formed in the lower base plate 31, and an embedded insert 33 is fixed to an inner side surface 31b on the concrete placing side. The embedded insert 33 is constituted by a bag-like nut having a female screw inside, and has a flange at the tip. The embedded insert 33 is disposed such that the open end is in contact with the inner side surface 31b of the lower base plate 31 and the inner space communicates with the bolt through hole. The embedded insert 33 is fixed to the lower base plate 31 by welding, for example. A plurality of bolt through holes and embedded inserts 33 are provided in the same number, and are arranged according to the shape of the lower flange plate 11 of the seismic isolation device 10. In the present embodiment, the bolt through holes and the embedded inserts 33 are provided at equal pitches on concentric circles centered on the positions of the center of gravity of the lower base plate 31 and the lower rising foundation 30. A stud anchor (not shown) may be fixed to the inner surface 31b of the lower base plate 31 by welding as necessary.

  The mold frame 32 includes a lower frame 32a that covers the periphery of the lower base plate 31 and a side frame 32b that stands up from the outer peripheral edge of the lower frame 32a, and the upper portion is open. The mold frame 32 is made of a wooden plate, and a reinforcing material (not shown) that presses them from the outside is appropriately provided on the outer peripheral surfaces of the lower frame 32a and the side frame 32b. The lower frame 32 a has a circular opening at the center (or a rectangular opening when the lower base plate 31 is square), and its inner peripheral edge is in contact with the outer peripheral edge of the lower base plate 31. The outer shape of the lower frame 32a has a square shape. The side frame 32b is disposed in parallel with the outer periphery of the lower frame 32a and is formed in a square shape in plan view.

  Sheath tubes 34 are erected in the vicinity of at least four corners of the lower frame 32a. The sheath tube 34 is formed to have the same length as the concrete casting thickness, and is configured to penetrate the upper and lower surfaces of the lower rising foundation 30. The sheath tube 34 is a member into which the anchor bolt 5 provided on the floor slab 3 is inserted, and is used when the lower rising foundation 30 is fixed to the floor slab 3. Such a fixing hole is not limited to the sheath tube 34, and may be determined according to a fixing means with the floor slab 3, and other types such as a sleeve type mechanical joint may be used. .

  The lower base plate 31 having the above-described configuration is installed at a work position so that the embedded mold insert 33 is on the upper side, and a mold frame 32 is formed around it. Then, after arranging the reinforcing bars (not shown) of the lower rising foundation 30, ordinary concrete is placed in the mold 32. At this time, the lower frame 32a and the lower base plate 31 are located at the lowermost part of the placement portion, and the concrete may be placed on the upper side thereof. It is not necessary to press fit into the. Therefore, it is not necessary to use high-fluidity concrete whose quality control is difficult when constructing the lower rising foundation 30, and special work such as a press-fitting method is not required, so that the construction efficiency is not lowered. When the concrete curing for a predetermined period is completed, the formwork 32 is dismantled and the manufacture of the lower rising foundation 30 is completed.

  As shown in FIG. 1B, when the upper base 20 is manufactured, the upper base plate 21 is laid on the floor surface at the work position, and a mold 22 is formed around the upper base plate 21, It is formed by casting concrete from precast concrete (precast concrete product).

  The upper base plate 21 is a member that contacts the upper flange plate 12 of the seismic isolation device 10 and has a planar shape that is the same as or slightly larger than the upper flange plate 12 (in the present embodiment, a larger circle). In addition, the shape of the upper flange plate 12 and the upper base plate 21 is not limited to a circle, and may be other shapes such as a square. The upper base plate 21 is disposed so as to be exposed on the lower surface of the upper base 20, and the contact surface 21 a (the lower surface in the construction completion state) is formed smoothly. The contact surface 21a faces downward in FIG. A bolt through hole (not shown) is formed in the upper base plate 21, and an embedded insert 23 is fixed to an inner side surface 21b on the concrete placing side. The bolt through hole and the embedded insert 23 have the same shape as that of the lower base plate 31 and the same arrangement form. A stud anchor (not shown) may be fixed to the inner surface 21b of the upper base plate 21 by welding as necessary.

  The mold frame 22 includes a lower frame 22a that covers the periphery of the upper base plate 21, and a side frame 22b that stands up from the outer peripheral edge of the lower frame 22a, and an upper portion is open. The mold 22 has a shape substantially equivalent to that of the mold 32. The height of the side frame 22b may differ from the side frame 32b depending on the shape of the upper base 20.

  The upper base plate 21 having the above-described configuration is placed at a working position such that the embedded mold insert 23 is on the upper side, and a mold 22 is formed around the upper base plate 21. And while arranging the base reinforcement (not shown) of the lower rising foundation 30, and arrange | positioning the column base part fixing anchor (building anchor) 24 and the footing reinforcement 25, concrete is laid. Like the lower rising foundation 30, the concrete is placed in the mold 22 using ordinary concrete. Also at this time, the lower frame 22a and the upper base plate 21 are located at the lowermost part of the placement portion, and the concrete only has to be poured into the upper part thereof, so that it is difficult to control the quality when the upper foundation 20 is constructed. There is no need to use reinforced concrete. When the concrete curing for a predetermined period is finished, the formwork 22 is dismantled and the manufacture of the upper foundation 20 is completed.

  The seismic isolation device 10 in this embodiment includes, for example, a lower flange plate 11 and an upper flange plate 12 formed in a pair of upper and lower sides, and a laminated rubber that is integrally attached between the lower flange plate 11 and the upper flange plate 12. 13 is adopted. A high-damping laminated rubber bearing is provided. In the seismic isolation device 10, when an earthquake or the like occurs, the elastic deformation of the laminated rubber 13 is elastically deformed in the shearing direction with the relative movement of the upper frame and the floor slab 3 in the horizontal direction. The horizontal seismic force at the time of earthquake is absorbed by energy and damping force. In the present embodiment, the high-damping laminated rubber bearing is adopted as the seismic isolation device 10, but the purpose is not limited to this. For example, an elastic sliding bearing or a combination of a low-damping laminated rubber bearing and a damper is used. Of course, etc. may be adopted. Each of the upper and lower flange plates 11 and 12 is formed in a circular plate shape, and a bolt through hole (not shown) for fixing the seismic isolation device 10 to the upper foundation 20 or the lower rising foundation 30 is provided at the peripheral edge thereof. ) Is formed. In the present embodiment, the upper and lower flange plates 11 and 12 are circular plates, but the shape is not limited to a circle, and other shapes such as a square and a polygon may be used. Good.

  When the production of the upper foundation 20 and the lower rising foundation 30 is completed, an assembly process is performed. When the lower rising foundation 30, the seismic isolation device 10 and the upper foundation 20 are integrated, the lower rising foundation 30 manufactured in the upside down state is placed in a vertically upright state (lower In the state where the side base plate 31 is on the upper side), it is installed at the work position. Thereafter, the seismic isolation device 10 is placed so that the lower flange plate 11 contacts the lower base plate 31 exposed on the upper surface of the lower rising foundation 30. Then, the bolt 14 (see FIG. 3) is inserted through the bolt through hole of the lower flange plate 11 and the bolt through hole of the lower base plate 31 in this order from the upper side, and further screwed into the female screw of the embedded insert 33. Tighten and fix. In addition, the floor surface in FIG. 2 has shown the floor surface of the work space.

  After that, the upper foundation 20 is placed on the seismic isolation device 10 with the upper base plate 21 facing down. At this time, the upper base plate 21 is brought into contact with the upper flange plate 12 of the seismic isolation device 10. Thereafter, the bolt 14 (see FIG. 3) is inserted through the bolt through hole of the upper flange plate 12 and the bolt through hole of the upper base plate 21 in this order from the lower side, and further screwed into the female screw of the embedded insert 23. Tighten and fix. The seismic isolation assembly 2 (see FIG. 3) is completed through the above steps.

(Seismic isolation assembly installation process)
Next, as shown in FIG. 3, the seismic isolation assembly 2 is installed on the floor slab 3. An anchor bolt 5 is provided at the installation position of the seismic isolation assembly 2 of the floor slab 3. Level adjustment hardware 6 is installed at the four corners of the installation position of the seismic isolation assembly 2 of the floor slab 3. The level adjustment hardware 6 is made of, for example, a stretchable member such as a bolt screw or a nut, and has a certain load on the seismic isolation assembly 2 (an upper casing connected to the seismic isolation assembly 2 until a grout material described later is cured). It has a pressure strength that can withstand the loaded load.

  Thereafter, the seismic isolation assembly 2 is suspended by a crane or the like, suspended so that the anchor bolt 5 is inserted into the sheath tube 34 of the lower rising foundation 30, and temporarily installed on the level adjustment hardware 6. At this time, in order to ensure the installation accuracy of the seismic isolation device 10, the position, height and inclination of the plane are measured at the position of the lower flange plate 11. Here, if levelness and height are not ensured, after adjusting with the level adjustment metal fitting 6, the nut 9 is temporarily tightened to the anchor bolt 5, and the seismic isolation assembly 2 is separated from a crane.

(Seismic isolation assembly fixing process)
After the nut 9 is fully tightened, the mold 40 is formed so as to cover the lower gap of the lower rising foundation 30 supported by the level adjusting hardware 6, and the grout material 7 is injected. The grout material 7 is made of, for example, non-shrink mortar and is press-fitted with a mortar pump (not shown). The grout is injected with the grout material 7 from a lower inlet (not shown) and filled below the lower rising foundation 30 and then rises between the inner peripheral surface of the sheath tube 34 and the anchor bolt 5 to exhaust the upper exhaust. Filling is completed when the grout material 7 flows out of the mouth.

(Column base connection process)
Thereafter, as shown in FIG. 4, the column base 4 is fixed to the upper foundation 20 of the seismic isolation assembly 2. In the present embodiment, a steel column is used. The column base 4 is suspended by a crane or the like, and the column base fixing anchor 24 is suspended so as to be inserted into the bolt hole 52 of the base plate 51 of the column base 4, and the upper base 20 is Then, the nut 53 is temporarily fastened to the column base fixing anchor 24. Even when the strength of the grout material 7 is not sufficiently generated, this column base portion connection step can be performed.

(Upper frame construction process)
Thereafter, as shown in FIG. 5, the upper beam 54, the upper column (not shown), and the like are sequentially connected, the upper housing is assembled, and the floor slab 57 is constructed. Then, after assembling the upper housing to the specified part, check the level and level, rebuild, and then fill the grout material 59b around the Manju mortar 59a and tighten the bolts and nuts of the connection part To do. FIG. 5 shows a state in which the footing 55, the foundation beam 56, and the floor slab 58 of the column base 4 are post-installed, and a dry column / beam on the upper floor is pre-constructed.

  Then, reinforcing bars (not shown) of the footing 55 and the foundation beam 56 are arranged on the upper foundation 20 to form a formwork (not shown), and concrete is placed, and the footing 55 and the foundation beam 56 are placed. And construct a floor slab 58.

  The seismic isolation structure 1 is constructed by the above processes. After that, the upper housing will be built sequentially.

  According to the construction method of the seismic isolation structure 1 as described above, the upper foundation 20 and the lower rising foundation 30 are precast and integrated with the seismic isolation device 10 to form the seismic isolation assembly 2 in advance. Then, only the base-isolated assembly 2 is installed on the floor slab 3, and the lower rising foundation 30 and the upper foundation 20 are constructed. Accordingly, since the steps of placing the concrete and curing the lower foundation 30 and the upper foundation 20 can be omitted, the number of work steps at the construction site can be reduced, and the construction period can be greatly shortened. Furthermore, since the seismic isolation assembly 2 is built up in a working space at a factory or construction site, etc., it is possible to manufacture a concrete with uniform and high accuracy.

  Furthermore, since the lower rising foundation 30 is manufactured in an upside down state, concrete is placed on the upper portion of the lower base plate 31. That is, since it is not necessary to press-fit concrete below the base plate as in the prior art, it is not necessary to use high-fluidity concrete when constructing the lower rising foundation 30, and ordinary concrete may be used. Thereby, it is possible to prevent an increase in construction labor and time, prevent a decrease in construction efficiency, and achieve a reduction in construction cost.

  In the above embodiment, the precast upper foundation 20 and lower rising foundation 30 are integrated with the seismic isolation device 10 and the seismic isolation assembly 2 is formed in advance and installed on the floor slab 3, At the construction site, a lower rising foundation formed in advance on the floor slab is installed, a seismic isolation device is installed on the lower rising foundation, and an upper foundation previously formed on the seismic isolation device is installed. You may make it install. Even in this case, it is possible to reduce the work period because the concrete placing work at the construction site can be reduced.

  Next, a modified example of the seismic isolation assembly will be described with reference to FIG. As shown in FIG. 6, the seismic isolation assembly 102 according to the present modification is used when a force against pulling is expected for the seismic isolation assembly 102. The shape is different from the lower rising foundation 30 of the seismic isolation assembly 2 shown in FIGS. In addition, the same code | symbol as the code | symbol attached | subjected in FIG. 3 thru | or FIG. 5 is attached | subjected to the site | part of the structure same as the structure of the said seismic isolation assembly 2, and the description is abbreviate | omitted.

  In the lower rising foundation 130, anchor bolts 135 are welded and fixed to the front end surface (lower end surface in the construction completion state) of the embedded insert 33 fixed to the inner side surface 31b of the lower base plate 31. A sleeve-type mechanical joint 136 that covers the anchor bolt 135 is built in the lower rising foundation 130. The sleeve type mechanical joint 136 is provided so as to extend in the vertical direction, and an anchor bolt 135 is inserted and screwed into an upper end portion thereof (upper end surface in the construction completion state). The lower end of the sleeve type mechanical joint 136 (the lower end surface in the construction completion state) is open to the lower surface of the lower rising foundation 130, and the anchor bolt 5 provided on the floor slab 3 is inserted. Further, the lower rising foundation 130 is formed so that the thickness in the vertical direction is thicker than that of the lower rising foundation 30, and the length of the sheath tube 134 is longer than the sheath tube 34 of the seismic isolation assembly 2. The clearance between the lower surface of the lower rising foundation 130 and the floor slab 3, the clearance between the inner peripheral surface of the sheath tube 134 and the anchor bolt 5, and the inner peripheral surface of the sleeve type mechanical joint 136 with the anchor bolt 135 and the anchor bolt 5. Grout material 7 is integrally filled in the gap. This is provided with an injection port (not shown) below the sleeve type mechanical joint 136 and the anchor bolt 5, and below the sheath tube 134 and the anchor bolt 5, and the grout material 7 is press-fitted from the injection port. Then, the grout material 7 flows into the gap below the lower rising foundation 130, the gap between the inner peripheral surface of the sheath tube 134 and the anchor bolt 5, and the inner peripheral surface of the sleeve-type mechanical joint 136, the anchor bolt 135, and the anchor bolt. When the grout material 7 is filled through the gap between the outer wall 5 and the grout material 7 flows out from the exhaust port at the upper end of the sheath tube 134, the grout is completed.

  According to the above configuration, the sleeve type mechanical joint 136 is newly provided, the anchor bolt 135 connected to the seismic isolation device 10 side is inserted into the upper end portion thereof, and the floor slab 3 is provided at the lower end portion. The strength of fixing the seismic isolation assembly 102 to the floor slab 3 can be increased by inserting the anchor bolts 5 and filling the gaps 7 with the grout material 7. Furthermore, since the length of the sheath tube 134 and the anchor bolt 5 inserted through the sheath tube 134 is increased, the strength of fixing the seismic isolation assembly 102 to the floor slab 3 can be further increased. Depending on design conditions, the sheath tube 134, the anchor bolt 5 and the nut 9 can be eliminated.

  On the other hand, when the force opposite to the pull-out is not required with respect to the seismic isolation assembly 102 ′, the rising foundation 41 is formed so as to surround the lower rising foundation 130 ′ as shown in FIG. 130 'is accommodated inside the rising foundation 41 with a gap, and the grout material 7 is filled in the gap, so that the seismic isolation assembly 102' and the rising foundation 41 are integrated. At this time, the surrounding rising foundation 41 is responsible for the horizontal force applied to the seismic isolation assembly 102 '. Further, as another form in the case where a force against pulling is expected for the seismic isolation assembly 102 ″, as shown in FIG. 8, it protrudes downward into the embedded insert 33 of the lower rising foundation 130 ″. The reinforcing bar 43 to be welded may be welded, and the reinforcing bar 43 may be inserted into the hole 44 formed in the floor slab 3 to fill the gap with the grout material 7.

(Second embodiment)
Next, a second embodiment of the construction method for a seismic isolation structure according to the present invention will be described. After the construction method of the seismic isolation structure 1 according to the first embodiment simultaneously manufactures the upper foundation 20 and the lower rising foundation 30 in the seismic isolation assembly manufacturing process, these are connected and integrated with the seismic isolation device 10 respectively. Whereas the seismic isolation assembly 2 was formed, the construction method of the seismic isolation structure 1 according to the second embodiment integrated the lower rising foundation on the seismic isolation device in the seismic isolation assembly manufacturing process. After the production, they are turned upside down and the upper base is integrally produced on the seismic isolation device to form a seismic isolation assembly. In addition, the shape of the seismic isolation assembly formed is the same as the seismic isolation assembly 2 of the first embodiment.

  Below, each process in a seismic isolation assembly manufacturing process is demonstrated. In the seismic isolation assembly manufacturing process, a formwork for the lower rising foundation (the same shape as the formwork 22 in FIG. 1B) is formed on the seismic isolation device, and concrete is placed in this formwork. The lower rising foundation manufacturing process in which the lower rising foundation is integrally manufactured with the lower flange plate, and these are turned upside down to form the upper foundation formwork (same as the formwork 32 in FIG. 1A). Shape), concrete is placed in this formwork, and the upper foundation is manufactured integrally with the upper flange plate, and the base isolation assembly is manufactured by the base isolation assembly manufacturing process. Pre-formed. Note that the base plate of the lower rising foundation and the upper foundation may or may not be provided.

  In the lower rising foundation manufacturing process and upper foundation manufacturing process, the level of the lower surface of the mold is adjusted by providing multiple level adjustment means such as expansion jacks at the bottom of the lower frame of each mold, and expanding and contracting the expansion jack appropriately. Is preferably ensured.

  According to the construction method of the seismic isolation structure according to the second embodiment as described above, the following operational effects can be obtained in addition to the operational effects similar to those of the first embodiment. That is, in the second embodiment, since the lower rising foundation and the upper foundation are sequentially manufactured on the seismic isolation device, the space for forming the seismic isolation assembly may be as large as the seismic isolation assembly. Therefore, the seismic isolation assembly can be manufactured even in a narrow space.

(Third embodiment)
Next, a third embodiment of the seismic isolation structure building method according to the present invention will be described in detail with reference to the accompanying drawings.

  In the construction method of the seismic isolation structure 1 according to the first embodiment and the second embodiment, the lower base plate 31 is provided on the lower rising foundation 30 and the upper base plate 21 is provided on the upper foundation 20. In the construction method of the seismic isolation structure 201 according to the third embodiment, the surfaces of the upper foundation 220 and the lower rising foundation 230 that are in contact with the seismic isolation device 10 are formed by the concrete surfaces 221, 231 respectively. The lower flange plate 11 of the seismic device 10 is brought into direct surface contact with the concrete surface 231 of the lower rising foundation 230, and the upper flange plate 12 of the seismic isolation device 10 is brought into direct surface contact with the concrete surface 221 of the upper foundation 220. It is characterized by that. That is, in the construction method of the seismic isolation structure 201 according to the third embodiment, the upper base plate and the lower base plate are not provided. A grout material (not shown) is filled between the lower flange plate 11 and the concrete surface 231 of the lower rising foundation 230, and a grout material (between the upper flange plate 12 and the concrete surface 221 of the upper foundation 220). (Not shown) may be filled.

  In this embodiment, after the upper foundation 220 and the lower rising foundation 230 are manufactured, they are connected to the seismic isolation device 10 and integrated to form the seismic isolation assembly 202 (seismic isolation assembly manufacturing process). It has become.

  The seismic isolation assembly manufacturing process in the present embodiment includes a lower rising foundation manufacturing process for manufacturing the lower rising foundation 230, an upper foundation manufacturing process for manufacturing the upper foundation 220, a lower rising foundation 230, the seismic isolation device 10, and the upper foundation. And an assembling process for integrating 220. This process is carried out by building hills in the work space of the factory or construction site.

  When manufacturing the lower rising foundation 230, first, as shown in FIG. 8A and FIG. 9, a mold 232 is installed. The mold frame 232 includes a lower frame 232a and a side frame 32b erected from the outer peripheral edge of the lower frame 232a, and an upper portion is open. The side frame 32b has the same configuration as the side frame 32b of the first embodiment. The lower frame 232a is configured by a steel plate or the like so as to have a planar accuracy equivalent to that of the base plate, and is a plane of the concrete surface 231 of the lower rising foundation 230 (a surface that contacts the lower flange plate 11 of the seismic isolation device 10). The accuracy is ensured.

  A fixing pin 233 for the embedded insert 33 is provided on the inner side surface 235 of the lower frame 232a. The fixing pin 233 is welded and fixed to the inner surface of the lower frame 232a and protrudes upward. The fixing pin 233 is inserted into the inner surface of the embedded insert 33, and is configured to fix the embedded insert 33 when placing concrete. Has been. The fixing pin 233 is arranged on a concentric circle that is a fixing position of the embedded insert 33. The embedded insert 33 is lowered from above the lower frame 232a and the fixing pin 233 is inserted.

  A sheath tube 34 is erected in the vicinity of at least four corners of the lower frame 232a. The sheath tube 34 has the same configuration as the sheath tube 34 of the first embodiment.

  Once the foundation reinforcing bars (not shown) of the lower rising foundation 230 are arranged in the mold 232, concrete is placed. Concrete is placed in the mold 232 using ordinary concrete. At this time, since the lower frame 232a is formed of an iron plate, the deformation is small even when receiving the weight of concrete. Therefore, the flatness of the concrete surface 231 of the lower rising foundation 230 can be ensured. In addition, since the embedded insert 33 is fixed by the fixing pin 233, it is possible to ensure high accuracy of the installation position of the embedded insert 33. When the concrete curing for a predetermined period is finished, the mold 232 is dismantled and the manufacture of the lower rising foundation 230 is completed. At this time, since the fixing pin 233 is removed together with the lower frame 232a, the embedded insert 33 is opened on the concrete surface 231.

  When manufacturing the upper foundation 220, as shown in FIG. 8B, a mold 222 is formed. The mold frame 222 is configured to include a lower frame 222a and a side frame 22b erected from the outer peripheral edge of the lower frame 222a, and an upper portion is opened. The side frame 22b has the same configuration as the side frame 22b of the first embodiment. Similarly to the lower frame 232a, the lower frame 222a is configured to have a planar accuracy equivalent to that of the base plate using an iron plate or the like, and the concrete surface 221 of the upper foundation 220 (the upper flange plate 12 of the seismic isolation device 10) The plane accuracy of the contact surface) is ensured.

  When the manufacture of the upper foundation 220 and the lower rising foundation 230 is completed, an assembly process is performed. The integration of the lower rising foundation 230, the seismic isolation device 10 and the upper foundation 220 is performed by the same process as in the first embodiment, as shown in FIGS. As shown in FIGS. 10 and 11, it is preferable to form a notch 234 on the upper surface of the lower rising foundation 230. The notch part 234 is formed on the side of the installation position of the seismic isolation device 10, and is for smoothly exchanging the seismic isolation device 10. The notch 234 may be covered with a plywood board.

  According to the construction method of the seismic isolation structure 1 according to the third embodiment as described above, the following operational effects can be obtained in addition to the operational effects similar to those of the first embodiment. That is, in the third embodiment, the upper flange plate 12 and the lower flange plate 11 of the seismic isolation device 10 are brought into contact with the concrete surfaces 221 and 231 of the upper foundation 220 and the lower rising foundation 230, respectively. Further, it is not necessary to provide a base plate as in the second embodiment, and the cost can be reduced accordingly.

DESCRIPTION OF SYMBOLS 1 Base isolation structure 2 Base isolation assembly 3 Ground side floor slab 4 Column base 10 Base isolation device 11 Lower flange plate 12 Upper flange plate 20 Upper foundation 21 Upper base plate 30 Lower rising foundation 31 Lower base plate 102 Base isolation assembly 130 Lower rising foundation 201 Seismic isolation structure 202 Seismic isolation assembly 220 Upper foundation 221 Concrete surface 230 Lower rising foundation 231 Concrete surface

Claims (5)

The seismic isolation device, the upper foundation composed of precast concrete, and the lower rising foundation composed of precast concrete manufactured upside down are integrated to form a seismic isolation assembly in advance. Seismic assembly manufacturing process,
A base isolation assembly installation step of installing the base isolation assembly on the ground side floor slab;
A column base part connecting step for connecting a column base part to the upper foundation of the base isolation assembly. 2. The seismic isolation assembly according to claim 1, wherein, in the seismic isolation assembly manufacturing process, after the upper foundation and the lower rising foundation are manufactured, they are respectively connected to and integrated with the seismic isolation device. How to build the structure. Of the surfaces of the upper foundation and the lower rising foundation, a surface that contacts the seismic isolation device is formed of a concrete surface,
The lower flange plate of the seismic isolation device is brought into contact with the concrete surface of the lower rising foundation directly or through a grout material, and the upper flange plate of the seismic isolation device is directly or grouted with the concrete surface of the upper foundation. The method for constructing a base-isolated structure according to claim 2, wherein contact is made through a material. A lower rising foundation composed of precast concrete manufactured upside down is installed on the ground side floor slab,
Install a seismic isolation device on the lower rising foundation,
A method of constructing a seismic isolation structure, characterized in that an upper foundation composed of precast concrete is installed on the seismic isolation device. Forming the lower rising foundation mold on the seismic isolation device, placing concrete in this mold to produce the lower rising foundation, and turning the integrated seismic isolation device and the lower rising foundation upside down The base-isolated assembly is pre-formed by forming a mold for the upper foundation on the seismic isolator and placing the concrete in the mold to produce the upper foundation. Process,
A base isolation assembly installation step of installing the base isolation assembly on the ground side floor slab;
A column base part connecting step for connecting a column base part to the upper foundation of the base isolation assembly.

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