JP7083285B2 - Seismic isolation upper foundation structure and its manufacturing method - Google Patents

Description

One embodiment of the present invention relates to a basic structure provided on a seismic isolation device. One embodiment of the present invention relates to a method for manufacturing a foundation structure provided on a seismic isolation device. Further, one embodiment of the present invention relates to a method of constructing a seismic isolation foundation using a seismic isolation upper foundation structure manufactured by a precast concrete (PCa) method.

In order to improve the earthquake resistance of buildings such as buildings, a seismic isolation structure is provided at the foundation. As the seismic isolation structure, for example, a structure in which a precast concrete board (PCa board) is placed on a seismic isolation device provided on a lower foundation and fixed by an anchor member (see Patent Document 1), a seismic isolation device. A structure in which a precast concrete board provided with a fixing portion for fixing the reinforcing bar is installed (see Patent Document 2), and a precast concrete board in which the reinforcing bar for fixing the main leg is embedded is placed on the seismic isolation device. The provided structure (see Patent Document 3) is disclosed.

Japanese Unexamined Patent Publication No. 2012-067524 (Patent No. 5737544) Japanese Unexamined Patent Publication No. 2014-091943 (Patent No. 5345238) Japanese Unexamined Patent Publication No. 2011-047201 (Patent No. 5232106)

In order to form a foundation structure called footing on the seismic isolation device, it is necessary to place concrete on site. In order to cast concrete, it is necessary to install the formwork and support it with the support for the formwork. Since a large amount of concrete is cast to form the foundation structure, a large amount of formwork support is also required. Therefore, there is a problem that on-site construction becomes complicated. Further, there is a problem that the work of arranging the reinforcing bars becomes complicated due to the mixture of the reinforcing bars for footing and the reinforcing bars for the foundation beam of the building. Further, when a seismic isolation foundation structure made of precast concrete is used, it is required to improve the seismic resistance.

One of the objects of the present invention is to provide a seismic isolated upper foundation structure and a method for manufacturing the same, in order to solve such a problem.

The method for manufacturing the seismic isolation upper foundation structure according to the embodiment of the present invention is to float from the bottom plate inside the side plate on an outer formwork including a bottom plate having a through hole and a side plate standing upright with respect to the bottom plate. In the formwork provided with the inner formwork in the state, a bag-shaped nut with a fixing plate is placed on the upper part according to the arrangement of the through holes of the bottom plate, and the base reinforcement is arranged inside the outer formwork. Then, by placing concrete inside the outer formwork at a height reaching the lower end of the inner formwork, and by placing concrete between the outer formwork and the inner formwork, the upper part of the bag-shaped nut. Includes forming a flat plate portion exposed to and a rising portion surrounding the flat plate portion.

The seismic isolation upper foundation structure according to one embodiment of the present invention includes a concrete portion in which a base bar is embedded, a bag-shaped nut whose upper portion is exposed from the concrete, and a fixing plate provided at the upper end of the bag-shaped nut. The concrete portion has a flat plate portion on which the bag-shaped nut is arranged and a rising portion surrounding the flat plate portion, and when the bag-shaped nut and the concrete portion are viewed in cross section, the concrete near the lower end of the bag-shaped nut is provided. The portion has a recess.

According to the seismic isolation upper foundation structure according to the embodiment of the present invention, the concrete portion in which the base reinforcement is embedded has a flat plate portion and a rising portion, and the bag-shaped nut and the fixing plate are exposed from the flat plate portion. When used as the foundation of a building, it can exhibit high resistance to pitching and rolling.

According to the manufacturing method according to the embodiment of the present invention, it is not necessary to install the formwork and the formwork support when placing concrete at the work site in order to manufacture the seismic isolated upper foundation structure. , Complicated work can be reduced. Further, since it is possible to prevent the reinforcing bars for the seismic isolated upper foundation structure and the reinforcing bars for the foundation beam from coexisting with each other, it is possible to simplify the work of arranging the reinforcing bars.

(A) It is a top view which shows the seismic isolation upper foundation structure which concerns on one Embodiment of this invention. (B) It is sectional drawing when the seismic isolation upper foundation structure which concerns on one Embodiment of this invention is seen from the side. It is an enlarged view of a part of the seismic isolation upper foundation structure 100 shown in FIG. 1 (B). It is sectional drawing which shows the state which the seismic isolation upper foundation structure which concerns on one Embodiment of this invention is attached to the seismic isolation device. (A) It is a top view which shows the manufacturing method of the seismic isolation upper foundation structure which concerns on one Embodiment of this invention. (B) It is sectional drawing which shows the manufacturing method of the seismic isolation upper foundation structure which concerns on one Embodiment of this invention. (A) It is sectional drawing which shows the manufacturing method of the seismic isolation upper foundation structure which concerns on one Embodiment of this invention. (B) It is sectional drawing which shows the manufacturing method of the seismic isolation upper foundation structure which concerns on one Embodiment of this invention. (A) It is sectional drawing which shows the manufacturing method of the seismic isolation upper foundation structure which concerns on one Embodiment of this invention. (B) It is sectional drawing which shows the manufacturing method of the seismic isolation upper foundation structure which concerns on one Embodiment of this invention. (A) It is a top view which shows the manufacturing method of the seismic isolation upper foundation structure which concerns on one Embodiment of this invention. (B) It is sectional drawing which shows the manufacturing method of the seismic isolation upper foundation structure which concerns on one Embodiment of this invention. (A) It is a top view which shows the manufacturing method of the seismic isolation upper foundation structure which concerns on one Embodiment of this invention. (B) It is sectional drawing which shows the manufacturing method of the seismic isolation upper foundation structure which concerns on one Embodiment of this invention. (A) It is sectional drawing which shows the manufacturing method of the seismic isolation upper foundation structure which concerns on one Embodiment of this invention. (B) It is sectional drawing which shows the manufacturing method of the seismic isolation upper foundation structure which concerns on one Embodiment of this invention. (A) It is a top view which shows the manufacturing method of the seismic isolation upper foundation structure which concerns on one Embodiment of this invention. (B) It is sectional drawing which shows the manufacturing method of the seismic isolation upper foundation structure which concerns on one Embodiment of this invention. (A) It is sectional drawing which shows the manufacturing method of the seismic isolation upper foundation structure which concerns on one Embodiment of this invention. (B) It is sectional drawing which shows the manufacturing method of the seismic isolation upper foundation structure which concerns on one Embodiment of this invention. It is sectional drawing which shows the manufacturing method of the seismic isolation upper foundation structure which concerns on one Embodiment of this invention. (A) It is a top view which shows the manufacturing method of the seismic isolation upper foundation structure which concerns on one Embodiment of this invention. (B) It is sectional drawing which shows the manufacturing method of the seismic isolation upper foundation structure which concerns on one Embodiment of this invention. (A) It is sectional drawing which shows the manufacturing method of the seismic isolation upper foundation structure which concerns on one Embodiment of this invention. (B) It is sectional drawing which shows the manufacturing method of the seismic isolation upper foundation structure which concerns on one Embodiment of this invention. It is sectional drawing which shows the manufacturing method of the seismic isolation upper foundation structure which concerns on one Embodiment of this invention.

Hereinafter, the contents of the embodiment of the present invention will be described with reference to the drawings and the like. However, the present invention includes many different aspects and is not construed as being limited to the contents of the embodiments exemplified below. In order to make the explanation clearer, the drawings may schematically show the width, thickness, shape, etc. of each part as compared with the actual embodiment, but this is just an example and the content of the present invention is limited. It's not something to do. In addition, in the present specification, when a certain element described in a certain drawing and a certain element described in another drawing have the same or corresponding relationship, the same code (or the number described as the code) is used. A reference numeral (a, b, etc.) may be added later, and the repeated description may be omitted as appropriate. Furthermore, the letters "1st" and "2nd" for each element are convenient signs used to distinguish each element, and have no further meaning unless otherwise specified. ..

(First Embodiment)
In the present embodiment, the foundation structure provided on the upper part of the seismic isolation device according to the embodiment of the present invention (hereinafter referred to as "seismic isolation upper foundation structure". Further, the seismic isolation upper foundation structure is referred to as "upper footing". There is also), and a method for producing the same will be described with reference to FIGS. 1 (A) to 6 (B).

[Structure of seismic isolated upper foundation structure 100]
FIG. 1A is a plan view of the seismic isolated upper foundation structure 100 according to the embodiment of the present invention. Further, FIG. 1B is a cross-sectional view of the seismic isolated upper foundation structure 100 when viewed from the side surface.

The seismic isolation upper foundation structure 100 includes a concrete portion 106, a bag-shaped nut 112, a fixing plate 114 attached to the upper portion of the bag-shaped nut 112, and base bars 116a and 116b.

The concrete portion 106 has a flat plate portion 108 and a rising portion 110 protruding from the flat plate portion 108. The rising portion 110 is provided so as to surround the four sides of the flat plate portion 108 along the peripheral edge portion of the concrete portion 106. The flat plate portion 108 and the rising portion 110 are described as different portions for convenience of explanation, but they are inseparably inseparable so as to form one structure as the concrete portion 106.

A plurality of bag-shaped nuts 112 are arranged on the concrete portion 106. A fixing plate 114 is provided on the upper portion of the plurality of bag-shaped nuts 112. The fixing plate 114 protrudes from the main body of the bag-shaped nut 112. The plurality of bag-shaped nuts 112 are embedded in the flat plate portion 108 of the concrete portion 106 when viewed in cross section, and their positions are fixed. Further, the plurality of bag-shaped nuts 112 are arranged at a plurality of locations so as to have a circumferential shape having a predetermined radius with the center of the flat plate portion 108 of the concrete portion 106 as the center of the circle when viewed in a plan view. Anchor bolts formed on the upper flange of the seismic isolation device are screwed into the plurality of bag-shaped nuts 112. Here, the plurality of bag-shaped nuts 112 are arranged so as to have a circumferential shape when viewed in a plan view, but may be appropriately arranged so as to have a polygonal shape such as a quadrangle or an octagon.

The base bars 116a and 116b are provided so as to be embedded in the concrete portion 106. The base bars 116a and 116b are arranged in the concrete portion 106. The thickness (cover thickness) from the surface of the concrete portion 106 to the base bars 116a and 116b is arbitrary, and has, for example, a thickness of 40 mm to 60 mm. The plurality of base bars 116a and 116b are provided so as to intersect vertically and horizontally in the concrete portion 106 so as not to interfere with the bag-shaped nut 112. The plurality of base muscles 116a and 116b are appropriately bound by a binding line at the intersection. As shown in FIG. 1 (B), the plurality of base bars 116a and 116b are rising portions 110 of the concrete portion 106 and have a shape bent so as to project upward. In other words, the plurality of base bars 116a and 116b are arranged in a grid pattern on the flat plate portion 108 and are provided so as to project from the upper surface of the rising portion 110, so that the upper portion is open in a cage shape. Has. The portion where the base bars 116a and 116b protrude from the concrete portion 106 is also referred to as a footing cage bar 118. As shown in FIG. 1 (B), the tip of the footing cage muscle 118 may be bent in a U shape.

The concrete portion 106 is bent so that the base bar protrudes upward, so that the strength and durability of the rising portion 110 are enhanced. Although not shown in the figure, the concrete portion 106 may be provided with a frame-shaped base bar along the rising portion 110. The height of the rising portion 110 is provided so as to be higher than the height of the bag-shaped nut 112 and the fixing plate 114, as will be described later. Further, although the thickness of the rising portion 110 is appropriately set, it has a width at least sufficient to satisfy the cover thickness of the footing cage muscle 118.

FIG. 2 is an enlarged view of a part of the seismic isolated upper foundation structure 100 shown in FIG. 1 (B). Specifically, it is sectional drawing which shows the detail of the rising part 110. The bag-shaped nut 112 is provided so that the lower portion is embedded in the concrete portion 106 and the upper portion is exposed from the concrete portion 106. The bag-shaped nut 112 is arranged on the flat plate portion 108 of the concrete portion 106. The upper portion of the bag-shaped nut 112 and the fixing plate 114 are exposed from the flat plate portion 108 and are arranged so as to be surrounded by the rising portion 110. The length L of the bag-shaped nut 112 is larger than the thickness D of the flat plate portion 108, and at least the fixing plate 114 is provided so as to be exposed from the flat plate portion 108. On the other hand, the height h2 at which the bag-shaped nut 112 and the fixing plate 114 protrude from the upper surface of the flat plate portion 108 is provided so that the rising portion 110 is smaller than the height h1 at which the rising portion 110 protrudes from the upper surface of the flat plate portion 108. That is, the height h1 of the rising portion 110 and the height h2 of the bag-shaped nut are provided so that the relationship of h1> h2 is established.

A footing 131 and a foundation beam 132 are provided on the seismic isolated upper foundation structure 100. When the foundation beam 132 is made of reinforced concrete, the reinforcing bars are arranged on the concrete portion 106. In this case, in order to secure the cover thickness of the concrete, the spacer 143 that supports the beam main bar 134 is arranged on the upper surface of the rising portion 110.

The seismic isolation upper foundation structure 100 is provided so that the bag-shaped nut 112 and the fixing plate 114 do not protrude from the rising portion 110 so that the bag-shaped nut 112 does not interfere with the reinforcement of the beam main bar 134. be able to. By having the rising portion 110, the concrete portion 106 can hold the beam main bar 134 at a position away from the flat plate portion 108. Since the rising portion 110 of the spacer 143 has a certain height, it is sufficient that the spacer 143 has a height sufficient to secure the cover thickness of the concrete, and the spacer 143 can be made smaller than the conventional one. .. In this way, the rising portion 110 can be used as a supporting portion for the beam main bar 134. When the foundation beam 132 is arranged on the seismic isolated upper foundation structure 100, the reinforcing arrangement work can be facilitated by using the rising portion 110 as the support portion of the beam main reinforcement 134.

In the present embodiment, the concrete portion 106 is preferably made of precast, not formed by directly placing concrete on the seismic isolation device. Since the seismic isolated upper foundation structure 100 is formed of precast concrete, the labor of arranging formwork and curing the work site at the work site forming the foundation of the building is eliminated, and the work efficiency is reduced. Can be improved.

FIG. 3 is a cross-sectional view showing a state in which the seismic isolation upper foundation structure 100 is attached to the seismic isolation device 122. The seismic isolation upper foundation structure 100 is fixed to the seismic isolation device 122 by anchor bolts 130. The seismic isolation device 122 includes a seismic isolation rubber portion 124, an upper flange 126, and a lower flange 128. The anchor bolt 130 is screwed into the bag-shaped nut 112 via the upper flange 126 of the seismic isolation device 122. The seismic isolation upper foundation structure 100 is stably held on the seismic isolation device 122 by fastening a plurality of points with anchor bolts 130. The seismic isolation device 122 is fixed on the seismic isolation lower foundation structure 120 by anchor bolts 130 through which the lower flange 128 is inserted.

A footing 131 and a foundation beam 132 are provided on the seismic isolated upper foundation structure 100. The footing 131 and the foundation beam 132 are manufactured by placing concrete so as to bury the beam main bar (not shown in FIG. 3). The concrete forming the footing 131 and the foundation beam 132 is provided so as to be in close contact with the upper surface portion of the seismic isolated upper foundation structure 100. That is, the concrete forming the footing 131 and the foundation beam 132 is provided so as to be in close contact with the upper surface of the rising portion 110 and the flat plate portion 108 of the seismic isolated upper foundation structure 100. As a result, the concave region formed by the flat plate portion 108 and the rising portion 110 of the concrete portion 106 is filled with the concrete forming the footing 131 and the foundation beam 132. The footing cage bar 118 protruding from the rising portion 110 extends into the footing 131 to increase the joint strength between the seismic isolated upper foundation structure 100 and the footing 131 and the foundation beam 132.

The seismic isolated upper foundation structure 100 and the foundation beam 132 are both formed of concrete and joined so that the footing cage bar 118 projects to a part of the footing 131. The rising portion 110 of the seismic isolated upper foundation structure 100 becomes a portion that causes a reaction when a lateral force is applied to the foundation beam 132, and causes resistance to the lateral slip of the foundation beam 132. Assuming that there is no rising portion, when a lateral force is applied to the foundation beam, the shearing force generated between the seismic isolated upper foundation structure and the foundation beam acts on the boundary portion as it is. On the other hand, in the seismic isolation upper foundation structure 100 according to the present embodiment, since the rising portion 110 is erected in the direction intersecting the direction in which the shearing force acts, it is generated by the lateral shaking of the foundation beam 132. It is possible to prevent the shearing force from acting on the boundary portion between the seismic isolation upper foundation structure 100 and the footing 131 or the foundation beam 132 as it is. As a result, the seismic isolated upper foundation structure 100 can increase the resistance of the building to the rolling motion of the earthquake.

In the seismic isolation upper foundation structure 100, the bag-shaped nut 112 and the fixing plate 114 protruding from the flat plate portion 108 are embedded in the footing 131. Since the fixing plate 114 is provided so as to protrude from the main body of the bag-shaped nut 112, it is a portion that generates a resistance force against a vertical force acting on the footing 131 and the foundation beam 132. That is, the seismic isolation upper foundation structure 100 is provided so that the fixing plate 114 provided on the upper part of the bag-shaped nut 112 protrudes from the flat plate portion 108 and is embedded in the footing 131, thereby causing vertical shaking and vibration. It is possible to increase resistance to.

[Method of manufacturing seismic isolated upper foundation structure 100]
Next, a method of manufacturing the seismic isolated upper foundation structure 100 shown in FIGS. 1 (A) and 1 (B) will be described with reference to FIGS. 4 (A) to 6 (B). The seismic isolated upper foundation structure 100 according to the present embodiment is manufactured by a precast concrete (PCa) method. In the following, a manufacturing method based on the precast concrete (PCa) method will be described.

4 (A) is a plan view showing a stage in which a bag-shaped nut is arranged on a formwork 133 having an outer formwork 136 and an inner formwork 137, and FIG. 4B is a plan view showing FIG. 4A. It is a cross-sectional view when the state shown in is seen from the side.

The outer formwork 136 includes a bottom plate 136a on which a through hole 104 is formed and a side plate 136b that stands upright with respect to the bottom plate 136a. The side plate 136b is arranged so as to surround the peripheral edge portion of the bottom plate 136a. A bag-shaped nut 112 having a fixing plate 114 attached to the upper portion is arranged in accordance with the arrangement of the through hole 104 formed in the bottom plate 136a of the outer formwork 136. The bag-shaped nut 112 may be temporarily fixed to the bottom plate 136a by a jig, or may be merely placed on the bottom plate 136a. Inside the side plate 136b of the outer formwork 136, the inner formwork 137 is arranged at a predetermined interval. The inner formwork 137 is supported in a floating state from the bottom plate 136a in order to form the rising portion 110. The height of the lower end of the inner formwork 137 is arranged to be lower than the height of the bag-shaped nut 112 and the fixing plate 114. The outer formwork 136 is supported by a base 138. Further, the inner formwork 137 is supported by the side plate 136b of the outer formwork 136 by the fastener 140 for fixing the inner formwork. The outer formwork 136 may be supported by a formwork support (not shown) so as to stabilize the arrangement. The outer formwork 136 and the inner formwork 137 are preferably made of metal. Further, as the fastener 140 for fixing the inner formwork, for example, bolts and nuts are used.

After arranging the bag-shaped nut 112 on the bottom plate 136a of the outer formwork 136, the inner formwork 137 may be fixed to the side plate 136b of the outer formwork 136, or the inner formwork 137 may be fixed to the outer formwork 136. After fixing the side plate 136b, the bag-shaped nut 112 may be arranged on the bottom plate 136a of the side plate 136b of the outer formwork 136. If the structure shown in FIG. 4A is completed before the concrete is placed, the order in which the members are installed may be changed.

FIG. 5A is a cross-sectional view showing a step of fixing the bottom plate 136a of the outer formwork 136 and the bag-shaped nut 112 with bolts 139. The bolt 139 is inserted into the bag-shaped nut 112 through the through hole 104 of the bottom plate 136a of the outer form 136. Then, by tightening the bolt 139, the bag-shaped nut 112 is fixed to the bottom plate 136a of the outer formwork 136.

FIG. 5B is a diagram showing a stage in which base bars 116a and 116b are arranged inside the outer formwork 136 and concrete is poured to the lower end of the inner formwork 137 or its vicinity to form a flat plate portion 108. Is. As shown in FIG. 1A, the base bars 116a and 116b are arranged in a grid pattern in the outer formwork 136. The base bars 116a and 116b are arranged so that the portion corresponding to the footing cage bar 118 extends upward from between the outer formwork 136 and the inner formwork 137. The concrete is embedded in the base bars 116a and 116b, and the upper part of the bag-shaped nut 112 and the fixing plate 114 are cast so as to be exposed. By hardening the concrete cast at this stage, the bag-shaped nut 112 is securely fixed.

FIG. 6A is a cross-sectional view showing a step of placing concrete between the outer formwork 136 and the inner formwork 137. The work of pouring concrete between the outer formwork 136 and the inner formwork 137 is preferably performed in a state where the concrete forming the flat plate portion 108 is stabilized and hardened to some extent. The rising portion 110 is formed by the concrete cast between the outer formwork 136 and the inner formwork 137. The height of the rising portion 110 can be adjusted by the amount of concrete poured between the outer formwork 136 and the inner formwork 137. In this case, it is desirable that the amount of concrete poured between the outer formwork 136 and the inner formwork 137 is at least a sufficient amount to be higher than the height of the fixing plate 114 protruding from the flat plate portion 108. When the concrete of the flat plate portion 108 is placed, the flat plate portion 108 and the rising portion 110 are integrated by roughening such as brushing, and the seismic isolation upper foundation structure 100 and the seismic isolation upper foundation structure 100. It can be integrated with the concrete placed on it. Further, the inner formwork 137 may be installed after the concrete of the flat plate portion 108 is poured.

FIG. 6B is a cross-sectional view showing a stage of dismantling the outer formwork 136 and the inner formwork 137 after the concrete has hardened. When the concrete hardens, the concrete portion 106 including the flat plate portion 108 and the rising portion 110 is formed. Finally, the bottom plate 136a of the outer formwork 136 and the bolt 139 that fixed the bag-shaped nut 112 are removed, the fastener 140 for fixing the inner formwork is removed, and the outer formwork 136 and the inner formwork 137 are removed. Dismantle.

By the above steps, the seismic isolated upper foundation structure 100 as shown in FIGS. 1 (A) and 1 (B) is produced. As shown in this embodiment, the seismic isolated upper foundation structure 100 having the rising portion 110 can be manufactured by placing the precast concrete in two stages.

According to the manufacturing method according to the present embodiment, it is not necessary to reduce the formwork work and install the formwork support, and it is possible to reduce complicated work. Further, since it is possible to prevent the reinforcing bars for the seismic isolated upper foundation structure and the reinforcing bars for the foundation beam from coexisting with each other, it is possible to simplify the work of arranging the reinforcing bars.

Further, since the seismic isolation upper foundation structure according to the present embodiment can be individually produced in a factory or a work place instead of being manufactured directly above the seismic isolation device, quality control of concrete is easy and quality. It has the advantage that the variation of can be reduced. Further, when the seismic isolated upper foundation structure 100 is manufactured at a factory, it can be produced systematically without being affected by the weather or the like, so that the construction period can be shortened. Further, as compared with the method of placing concrete on site, the amount of formwork and formwork support used can be reduced, complicated work can be omitted at the site, and construction cost can be reduced. In this embodiment, as shown in FIGS. 6 (A) and 6 (B), a mode in which concrete is placed in two stages is shown, but the present invention is not limited to this, and the concrete is placed once. The flat plate portion 108 and the rising portion 110 may be formed.

Conventionally, a base plate has been used when forming a seismic isolated upper foundation structure by a precast method. After arranging bag-shaped nuts on the base plate and forming a formwork around the base plate, the base reinforcement was arranged on the formwork and concrete was placed. By using the base plate, the bag-shaped nut can be placed precisely, but it has been desired to further reduce the load and reduce the thickness of the seismic isolated upper foundation structure.

In the method of manufacturing the seismic isolation upper foundation structure 100 according to the present embodiment, the bag-shaped nut 112 is arranged on the formwork 133 provided with the through hole 104, and the bolt 139 is inserted into the bag-shaped nut 112 through the through hole 104. It is screwed into and fixed. Therefore, the bag-shaped nut 112 can be precisely arranged without using the base plate. Further, since it is not necessary to use the base plate, the load of the seismic isolated upper foundation structure 100 can be reduced and the thickness can be reduced.

(Second Embodiment)
In the present embodiment, the structure of the seismic isolated upper foundation structure 100A having a structure partially different from that of the seismic isolated upper foundation structure 100 and the method of manufacturing the same will be described with reference to FIGS. 7 (A) to 12. In this embodiment, the differences from the seismic isolated upper foundation structure 100 will be described, and detailed description of the same configuration and function will be omitted.

[Structure of seismic isolated upper foundation structure 100A]
FIG. 7A is a plan view of the seismic isolated upper foundation structure 100A according to the embodiment of the present invention. Further, FIG. 7B is a cross-sectional view when the seismic isolated upper foundation structure 100A shown in FIG. 7A is cut along the lines A1-A2.

As shown in FIG. 7B, the seismic isolation upper foundation structure 100A according to the present embodiment has a structure in which the concrete portion 106 has a recess 107 in the vicinity of the lower portion of the bag-shaped nut 112. The recess 107 is provided so as to surround the bag-shaped nut 112.
Further, the recess 107 has a cylindrical shape surrounding the bag-shaped nut.

[Method of manufacturing seismic isolated upper foundation structure 100A]
Next, a method of manufacturing the seismic isolated upper foundation structure 100A shown in FIGS. 7 (A) and 7 (B) will be described with reference to FIGS. 8 (A) to 9 (B). A detailed description of the same process as the method for manufacturing the seismic isolated upper foundation structure 100 will be omitted.

FIG. 8A is a plan view showing a stage in which the jig 141 is arranged on the formwork 133 having the outer formwork 136 and the inner formwork 137, and FIG. 8B is shown in FIG. 8A. It is sectional drawing when the state shown is seen from the side.

As shown in FIGS. 8A and 8B, the bottom plate 136a of the outer formwork 136 is not provided with a through hole, which is different from the manufacturing method described in the first embodiment. .. Instead of the through hole, in the present embodiment, a plurality of jigs 141 are arranged on the bottom plate 136a. The plurality of jigs 141 have a cylindrical shape in which the inside of the cylinder is hollowed out. Further, when the cylindrical jig 141 is viewed in cross section, the height of the outside of the cylindrical jig 141 is the same as that of the inside of the cylindrical jig 141. The plurality of jigs 141 are arranged so as to have a circumferential shape having a predetermined radius with the center of the bottom plate 136a of the outer mold 136 as the center of the circle when viewed in a plan view. Multiple jigs are fixed by welding. Further, it is sufficient that the jig 141 can fix the bag-shaped nut 112, and it is preferable to select a jig 141 as small as possible.

FIG. 9A is a cross-sectional view showing a step of inserting a bag-shaped nut 112 having a fixing plate 114 on the upper portion into a jig 141 provided on the bottom plate 136a. The bag-shaped nut 112 is arranged in the bottom plate 136a of the outer formwork 136 by being inserted into the cylindrical jig 141.

In FIG. 9B, the base bars 116a and 116b are arranged inside the outer formwork 136, and concrete is placed between the outer formwork 136 and the inner formwork 137 to form the concrete portion 106. It is a figure which shows the stage to do. Finally, the inner formwork fixing fastener 140 is removed, and the outer formwork 136 and the inner formwork 137 are disassembled.

By the above steps, the seismic isolated upper foundation structure 100A as shown in FIGS. 7 (A) and 7 (B) is produced. According to the method for manufacturing the seismic isolated upper foundation structure 100A according to the present embodiment, the jig 141 is arranged on the bottom plate 136a of the outer formwork 136. In one embodiment of the present invention, the bag-shaped nut can be precisely arranged without using a base plate. Moreover, since it is not necessary to use a base plate, the load of the seismic isolated upper foundation structure can be reduced and the thickness can be reduced.

<Modification 1>
Next, with reference to FIGS. 10A to 12, a method for manufacturing the seismic isolated upper foundation structure 100B, which is partially different from the method for manufacturing the seismic isolated upper foundation structure 100A according to the present embodiment, will be described.

FIG. 10A is a plan view showing a stage in which the jig 141A is arranged on the formwork 133 having the outer formwork 136 and the inner formwork 137, and FIG. 10B is shown in FIG. 10A. It is sectional drawing when the state shown is seen from the side.

The difference from the manufacturing method described with FIGS. 8 (A) to 9 (B) is that the shapes of the plurality of jigs 141A are different as shown in FIG. 10 (B). The plurality of jigs 141A have a cylindrical shape in which the inside of the cylinder is hollowed out, but the shape of the cross section thereof is different. That is, the height on the outside of the cylindrical jig 141A is higher than the height on the inside of the cylindrical jig 141A.

FIG. 11A is a cross-sectional view showing a step of inserting a bag-shaped nut 112 having a fixing plate 114 on the upper portion into a jig 141A provided on the bottom plate 136a. The bag-shaped nut 112 is fixed to the bottom plate 136a of the outer formwork 136 by being inserted into the cylindrical jig 141A.

In FIG. 11B, base bars 116a and 116b are arranged inside the outer formwork 136, and concrete is placed between the outer formwork 136 and the inner formwork 137 to form the concrete portion 106. It is a figure which shows the stage to do. Finally, the inner formwork fixing fastener 140 is removed, and the outer formwork 136 and the inner formwork 137 are disassembled.

By the above steps, the seismic isolated upper foundation structure 100B as shown in FIG. 12 is manufactured. In the method for manufacturing the seismic isolated upper foundation structure 100B shown in FIGS. 10A to 12, the height on the outside of the cylindrical jig 141A is higher than the height on the inside of the cylindrical jig 141A. Since the jig 141A has such a structure, the concrete portion 106 and the bag-shaped nut 112 can be easily removed from the outer formwork 136 in the process of FIG. 11B. As a result, the manufacturing time of the seismic isolated upper foundation structure 100B can be shortened.

(Third Embodiment)
In the present embodiment, the structure of the seismic isolated upper foundation structure 100C having a structure partially different from that of the seismic isolated upper foundation structure 100A and the method for manufacturing the same will be described with reference to FIGS. 13 (A) to 15. In this embodiment, the differences from the seismic isolated upper foundation structure 100A will be described, and detailed description of the same configuration and function will be omitted.

[Method of manufacturing seismic isolated upper foundation structure 100C]
FIG. 13A is a plan view showing a stage in which the jig 141B is arranged on the formwork 133 having the outer formwork 136 and the inner formwork 137, and FIG. 13B is shown in FIG. 13A. It is sectional drawing when the state shown is seen from the side.

The difference from the manufacturing method described in the second embodiment is that the shapes of the plurality of jigs 141B arranged on the bottom plate 136a are different as shown in FIGS. 13 (A) and 13 (B). The plurality of jigs 141B have a columnar shape such as a columnar shape or a polygonal columnar shape. Further, the plurality of jigs 141B may have a frustum shape such as a frustum shape with the apex removed or a polygonal frustum shape. The plurality of jigs 141B are arranged so as to have a circumferential shape having a predetermined radius with the center of the bottom plate 136a of the outer mold 136 as the center of the circle when viewed in a plan view. The plurality of jigs 141B are fixed by welding.

FIG. 14A is a cross-sectional view showing a step of inserting a bag-shaped nut 112 having a fixing plate 114 on the upper portion into a jig 141B provided on the bottom plate 136a. By inserting the bag-shaped nut 112 into the jig 141B provided on the bottom plate 136a, the bag-shaped nut 112 is fixed to the bottom plate 136a of the outer formwork 136.

Next, as described with reference to FIGS. 5 (B) to 6 (B), the base bars 116a and 116b are arranged inside the outer formwork 136, and between the outer formwork 136 and the inner formwork 137. By placing concrete, the concrete portion 106 is formed. Finally, the inner formwork fixing fastener 140 is removed, and the outer formwork 136 and the inner formwork 137 are disassembled. When the outer formwork 136 is disassembled, the jig 141B is detached from the bag-shaped nut 112.

By the above steps, the seismic isolated upper foundation structure 100C as shown in FIG. 14B is formed. In the method of manufacturing the seismic isolated upper foundation structure 100C according to the present embodiment, the jig 141B is placed on the formwork 133, and the bag-shaped nut 112 is inserted into the jig 141B to make the bag-shaped nut 112 an outer formwork. It can be precisely placed on the bottom plate 136a of 136. Therefore, the bag-shaped nut 112 can be precisely arranged without using the base plate. Further, since it is not necessary to use the base plate, the load of the seismic isolated upper foundation structure 100C can be reduced and the thickness can be reduced.

<Modification 2>
Next, with reference to FIG. 15, a method for manufacturing the seismic isolated upper foundation structure 100C, which is partially different from the method for manufacturing the seismic isolated upper foundation structure 100C according to the present embodiment, will be described.

The difference from the manufacturing method described with FIGS. 13 (A) to 14 (B) is that, as shown in FIG. 15, a plurality of jigs 141B are fixed by bolts 144. The plurality of jigs 141B are fixed by bolts 144 via through holes 104A formed in the bottom plate 136a of the outer formwork 136. Thereby, the plurality of jigs 141B and the bottom plate 136a can be more firmly fixed.

After fixing the bag-shaped nut 112 to the bottom plate 136a of the outer formwork 136, the base bars 116a and 116b are arranged inside the outer formwork 136 as described with reference to FIGS. 5 (B) to 6 (B). Then, concrete is placed between the outer formwork 136 and the inner formwork 137 to form the concrete portion 106. Finally, the inner formwork fixing fastener 140 is removed, and the outer formwork 136 and the inner formwork 137 are disassembled.

By the above steps, the seismic isolated upper foundation structure 100C as shown in FIG. 14B is formed. In the method of manufacturing the seismic isolated upper foundation structure 100C according to the present embodiment, the jig 141B is arranged on the formwork 133 provided with the through hole 104A, and the bolt 144 is screwed into the jig 141B through the through hole 104A. It is fixed. By inserting the bag-shaped nut 112 into the jig 141B fixed in this way, the bag-shaped nut 112 can be precisely arranged on the bottom plate 136a of the outer formwork 136. Therefore, the bag-shaped nut 112 can be precisely arranged without using the base plate. Further, since it is not necessary to use the base plate, the load of the seismic isolated upper foundation structure 100C can be reduced and the thickness can be reduced.

100: Seismic isolation upper foundation structure, 100A: Seismic isolation upper foundation structure, 100B: Seismic isolation upper foundation structure, 100C: Seismic isolation upper foundation structure, 104: Through hole, 106: Concrete part, 107: Recess, 108: Flat plate part , 110: Rising part, 112: Bag-shaped nut, 114: Fixing plate, 116a, 116b: Base bar, 118: Footing cage bar, 120: Seismic isolation lower foundation structure, 122: Seismic isolation device, 124: Seismic isolation rubber section , 126: Upper flange, 128: Lower flange, 130: Anchor bolt, 131: Footing, 132: Foundation beam, 133: Form frame, 134: Beam main bar, 136: Outer form frame, 136a: Bottom plate, 136b: Side plate, 137 : Inner mold: 138: Foundation, 139: Bolt, 140: Inner mold fixing fastener, 141: Jig, 141A: Jig, 141B: Jig, 143: Spacer

Claims (11)

The bottom plate is provided on an outer formwork including a bottom plate having a through hole and a side plate upright with respect to the bottom plate, and an inner formwork provided inside the side plate while floating from the bottom plate. A bag-shaped nut with a fixing plate is placed on the upper part according to the arrangement of the through holes.
Base reinforcement is arranged inside the outer formwork,
The bag-shaped nut is placed inside the outer formwork at a height reaching the lower end of the inner formwork, and then concrete is placed between the outer formwork and the inner formwork. A method for manufacturing a seismic isolated upper foundation structure, which comprises forming a flat plate portion in which the upper portion of the concrete is exposed and a rising portion surrounding the flat plate portion. After arranging the bag-shaped nut with the fixing plate on the upper part according to the arrangement of the through hole,
The method for manufacturing a seismic isolated upper foundation structure according to claim 1, wherein a first bolt is screwed into the bag-shaped nut through the through hole of the bottom plate. A bag-shaped nut inserted into the jig and having a fixing plate on the upper part is placed on an outer formwork including a bottom plate to which the jig is fixed and a side plate upright with respect to the bottom plate.
An inner formwork provided in a state of floating from the bottom plate is arranged inside the side plate of the outer formwork.
Base reinforcement is arranged inside the outer formwork,
The bag-shaped nut is placed inside the outer formwork at a height reaching the lower end of the inner formwork, and concrete is placed between the outer formwork and the inner formwork. A method for manufacturing a seismic isolated upper foundation structure, which comprises forming a flat plate portion in which the upper portion of the concrete is exposed and a rising portion surrounding the flat plate portion. The jig has a cylindrical shape and has a cylindrical shape.
The method for manufacturing a seismic isolated upper foundation structure according to claim 3, wherein the bag-shaped nut is arranged so as to be inserted into the cylindrical jig. The production of the seismic isolation upper foundation structure according to claim 4, wherein the height of the outside of the cylindrical jig is the same as the height of the inside of the cylindrical jig when the cylindrical jig is viewed in cross section. Method. The method for producing a seismic isolated upper foundation structure according to claim 4, wherein when the cylindrical jig is viewed in cross section, the height outside the cylindrical jig is higher than the height inside the cylindrical jig. .. The jig has a columnar shape and has a columnar shape.
The method for manufacturing a seismic isolation upper foundation structure according to claim 3, wherein the bag-shaped nut is arranged so as to insert the columnar jig. The jig has a frustum shape with the apex removed.
The method for manufacturing a seismic isolated upper foundation structure according to claim 6, wherein the bag-shaped nut is arranged so as to insert the frustum-shaped jig. The method for manufacturing a seismic isolated upper foundation structure according to claim 7 or 8, wherein the jig is fixed by a second bolt through a through hole provided in the bottom plate. The concrete part where the base bar is buried and
A bag-shaped nut whose upper part is exposed from the concrete part,
With a fixing plate attached to the upper part of the bag-shaped nut,
The concrete portion has a flat plate portion on which the bag-shaped nut is arranged and a rising portion surrounding the flat plate portion.
When the bag-shaped nut and the concrete portion are viewed in cross section, the concrete portion near the lower portion of the bag-shaped nut has a recessed portion, which is a seismic isolated upper foundation structure. The seismic isolation upper foundation structure according to claim 10, wherein the recess has a cylindrical shape surrounding the bag-shaped nut.

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