JP2001323482A - Foundation structure for base isolated building, precast concrete foundation block for base isolated building, and method of executing foundation for base isolated building - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a foundation structure for a base isolated building excellent in reality as a foundation for the base isolated building and capable of shortening a construction period. SOLUTION: This foundation structure for the base isolated building is formed so that an upper structural body is installed on a base isolating device installed on the foundation and the upper structural body is supported for base isolation by the base isolating device. Only foundation portions C1 to C5 for installing the base isolating device thereon are formed of precast concrete, and the other foundation portions F1 to F3 between the portions for installing the base isolating device thereon are formed of cast-in-place concrete to integrally connect the foundation portions to each other.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a base structure of a base-isolated building, a precast concrete base block for the base-isolated building, and a method of constructing a base of the base-isolated building.

[0002]

2. Description of the Related Art In a detached house, a seismic isolation building in which the upper structure is seismically isolated (laminated rubber bearing, rolling bearing, sliding bearing) from the foundation on the ground side by a seismic isolation device is already known. It is disclosed in Japanese Patent Application Laid-Open No. 10-306841. In a base-isolated building, the superstructure can be displaced horizontally relative to the foundation, and the horizontal displacement between the superstructure and the foundation absorbs seismic energy,
Seismic energy can be prevented from acting on the superstructure.

[0003] The base of the seismic isolation building as described above is made of reinforced concrete. Conventionally, all of the foundations are constructed by arranging reinforcing bars at a construction site and casting concrete at the site. .

[0004] Since the base of a seismic isolation building requires an arrangement part of a seismic isolation device, the structure is usually more complicated than the foundation of the building and accuracy is also required.
As the construction period becomes longer and skilled workers are required, a method to complete the foundation for a base-isolated building by combining and joining precast concrete foundation components with a split structure at the construction site is proposed as the base of the base-isolated building. (JP-A-8-338033).

[0005]

SUMMARY OF THE INVENTION Japanese Patent Application Laid-Open No. 8-33803
The foundation as disclosed in Japanese Patent Publication No. 3 can shorten the construction period, however, about the fact that all of the foundation is made of precast concrete and the foundation is completed by joining the precast concrete foundation components at the building site, There is a problem on how to join the precast concrete foundation components, and even if the construction accuracy is added, it is not realistic, and it will be established as a foundation for a seismically isolated building with considerable strength It is difficult.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and has a high degree of realism as a base of a base-isolated building. Base blocks, and
The purpose is to provide a method for constructing the foundation of a base-isolated building.

[0007]

In order to achieve the above object, a base structure of a base-isolated building according to the first aspect of the present invention comprises an upper structure installed on a base-isolated device installed on the foundation. In the base structure of a base-isolated building in which the upper structure is seismically isolated and supported by the base-isolation device, only the base of the portion where the base-isolation device is installed is made of precast concrete, and the base-isolation device is installed. The foundation of the other part between the parts is made of cast-in-place concrete and is integrally joined as a whole.

According to this configuration, only the foundation of the important part where the seismic isolation device is installed is made of precast concrete,
The other part of the foundation is made of cast-in-place concrete, the precast concrete part and the cast-in-place concrete are joined by a cold joint, and the part of the foundation is cast-in-place to form an integral joint.

According to another aspect of the present invention, there is provided a precast concrete foundation block for a base-isolated building according to the present invention. This is a foundation block, which is made of reinforced concrete and has a fixing reinforcing bar connected to a concrete reinforcing bar cast in place, which is exposed to the outside from the precast concrete body.

According to this structure, the precast concrete foundation block contains a reinforcing bar and serves as a basis for an important part for installing the seismic isolation device. Since the reinforcing bar is exposed outside from the precast concrete body, By connecting this reinforcing steel to the reinforcing steel of the concrete foundation cast in place, the reinforcing steel of the precast concrete foundation block and the reinforcing steel of the concrete foundation cast in place can be connected.

In order to achieve the above object, a method for constructing a foundation of a base-isolated building according to the invention of claim 3 is as follows.
An upper structure is installed on a seismic isolation device installed on a foundation, and the upper structure is seismically isolated and supported by the seismic isolation device. A precast concrete foundation block for installing a seismic isolation device that is exposed to the outside from the main body is arranged at a predetermined position on the building site, and reinforcing bars of the reinforced concrete foundation are arranged between the arrangement portions of the precast concrete foundation block. This reinforcing steel is connected to a reinforcing steel for fixing the precast concrete foundation block, and the concrete of the reinforced concrete foundation between the arrangement portions of the precast concrete foundation block is cast in place.

According to this construction method, only the foundation of the important part where the seismic isolation device is installed is constituted by the precast concrete foundation block, and the foundation of the other part (between the arrangement parts of the precast concrete foundation block) is It is composed of cast-in-place concrete, and the precast concrete part and the cast-in-place concrete are joined by a cold joint with steel bars connected. Is obtained.

According to a fourth aspect of the present invention, in the method of constructing a foundation for a base-isolated building, a plurality of anchor bolts projecting from the upper surface of the precast concrete body are embedded in the precast concrete foundation block. An adjusting nut is screwed into each of the bolts, and a base plate for the seismic isolation device is installed on the upper surface of the precast concrete body so that the level can be adjusted by the adjusting nut, and between the upper surface of the precast concrete body and the base plate. A non-shrink mortar is cast.

According to this construction method, the base plate for the seismic isolation device is level-adjusted on the precast concrete body by the adjusting nut, and the space between the upper surface of the precast concrete body and the base plate is filled with non-shrink mortar. In other words, seismic isolation devices can be installed on the precast concrete body with individual level adjustment.

According to a fifth aspect of the present invention, in the method for constructing a foundation of a base-isolated building, a vibrator hole is formed in the base plate, and a vibrator is inserted from the vibrator hole when the non-shrink mortar is poured. Vibration is applied to the casting of the non-shrink mortar.

According to this construction method, when the non-shrinkable mortar is poured, the non-shrinkable mortar is vibrated by the vibrator inserted from the vibrator hole formed in the base plate, and the gap between the upper surface of the precast concrete body and the base plate is formed. The non-shrink mortar is evenly filled.

[0017]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. 1 to 13 show an embodiment of a base structure of a base-isolated building, a precast concrete base block for the base-isolated building, and a method of constructing a base of the base-isolated building according to the present invention.

In these figures, C1, C2, C3, C
Reference numeral 4 denotes a precast concrete foundation block for a base-isolated building (hereinafter abbreviated as a PC foundation block).
Reference numerals 1, F2 and F3 indicate reinforced concrete foundations obtained by casting concrete in place between PC foundation blocks C1 to C4.

The PC basic blocks C1 to C5 are each provided with a cage bar D1.
3 and abdominals D10, etc., and are produced in advance in a factory or the like. A fixing reinforcing bar D16 connected to the reinforcing bars of the reinforced concrete foundations F1 to F3 to be cast in place is provided outside the precast concrete body P. (See FIG. 10). In the PC base blocks C1 to C4, a plurality of anchor bolts A for installing a base plate are embedded in advance in such a manner that the upper portions of the bolts protrude from the upper surface of the precast concrete body P.
Although not shown, the PC basic blocks C1 to C5 are provided with hooks for hanging a crane so as to be detachable.

FIG. 3 shows a PC basic block C1 having a corner arrangement.
The isolator of the seismic isolation device and the wind fixing device are installed on the PC basic block C1. The PC foundation block C1 has a square upper surface, and is wide so that the PC foundation block C1 protrudes inside the building with respect to the width of the reinforced concrete foundations F1, F2, and F3. On top of this, an isolator composed of a cross linear bearing device is suitable for installation along the 45-degree direction on the upper surface of the square, and a wind fixing device can be installed at the same time. Therefore, it is most suitable as a PC base block for a base-isolated building. FIG. 4 shows a PC basic block C2 in an intermediate arrangement.
5, FIG. 6 shows the PC basic block C3 of the intermediate arrangement, FIG. 6 shows the PC basic block C4 of the intermediate arrangement, FIG. 6 shows the PC basic block C3 of the intermediate arrangement, and FIG. Shows the PC basic block C2,
An isolator for the seismic isolation device is installed on C3, and a damper for the seismic isolation device is installed on the PC basic block C4.
On the C basic block C5, a wind fixing device of a seismic isolation device is installed. Further, a chamber E for a wind fixing device is formed in the PC basic block C5 in advance. Since the PC base block C5 has the chamber E formed in advance, the wind fixing device can be inserted into the chamber E at the site, so that the PC base block C5 can be installed very easily, and is optimal as the PC base block of the base-isolated building.

FIG. 8 shows a reinforced concrete foundation F.
1 and F3, and FIG. 9 shows a reinforced concrete foundation F2. These are arranged at a construction site with a cage bar D13 and an abdominal muscle D10, and the concrete is cast on site to complete.

Next, a method of constructing a foundation for a base-isolated building according to the present invention will be described. First, at the construction site, we will mark the basic layout. Next, the PC base blocks C1 to C5 for installing the seismic isolation device are lifted by a crane and lowered to a predetermined position on the construction site. When lowering the basic blocks C1 to C5, lowering is performed while accurately adjusting the position with a ground marking line, a water thread or the like.

Next, reinforced concrete foundations F1 to F
3 Reinforcement (bar cage D13 and abdominal muscle D10 etc.)
The reinforcing bar D1 protruding from the precast concrete body P of the PC base blocks C1 to C5 with this reinforcing bar.
Connect with 6.

Next, reinforced concrete foundations F1 to F
3. Cast concrete in place. Reinforced concrete foundation F1-F3 concrete and PC foundation block C1
The concrete of ~ C5 is a cold joint in which the internal rebar is interconnected.

Next, as shown in FIGS. 11 to 13, an adjustment nut N10 and a lock nut N11 are screwed into each of the anchor bolts A of the PC basic blocks C1 to C5, and Pass the anchor bolt A through the bolt through hole h of the base plate B for the seismic isolation device,
With the level of the base plate B adjusted by the adjustment nut N10, the fastening nut N12 is attached to the anchor bolt A, and the base plate B is fixed to the anchor bolt A.

FIG. 11 shows a base plate disposition portion for an isolator, FIG. 12 shows a base plate disposition portion for a damper, and FIG. 13 shows a base plate disposition portion for a wind fixing device. In FIGS. 11 to 13, the bar arrangement display is omitted. An air vent hole j is formed in the isolator base plate B, and a vibrator hole k and a mortar casting opening m are formed in the damper base plate B, respectively.

Next, a mold (not shown) is arranged around the base plate B for casting the non-shrink mortar, and the non-shrink mortar is provided between the upper surface of the precast concrete body P and the base plate B in the mold. Place M. After the non-shrink mortar M has solidified, the mold is removed.

At the time of placing the non-shrink mortar M, a vibrator (not shown) can be inserted through the vibrator hole k to apply vibration to the placement of the non-shrink mortar M.
Thereby, the non-shrink mortar M can be evenly filled between the upper surface of the precast concrete body P and the base plate B.

With the above construction, the base plate B for the seismic isolation device is level-adjusted on the precast concrete body P by the adjusting nut N10, and the space between the upper surface of the precast concrete body P and the base plate B is filled with the non-shrink mortar M. The seismic isolation device such as an isolator, a damper, and a wind fixing device can be installed on the precast concrete body P via the base plate B in an individual level adjusted state.

[0030]

As will be understood from the above description, according to the foundation structure of the base-isolated building according to the first aspect of the present invention, only the foundation of the important part where the base-isolation device is installed is made of precast concrete. , The foundation of the other part is made of cast-in-place concrete, the part made of precast concrete and the cast-in-place concrete are joined by cold joints, the cast-in-place is partially joined, and the entire foundation has an integral joint structure Therefore, it is highly realistic as the basis of a seismic isolation building, and can reduce the number of on-site man-hours and shorten the construction period.

According to the precast concrete base block for a base-isolated building according to the second aspect of the present invention, the precast concrete base block itself is a base of an important part in which a seismic isolation device is installed with rebars, The anchoring rebar is exposed to the outside from the precast concrete body.By connecting this anchoring rebar to the rebar of the concrete foundation to be cast in place, the rebar of the precast concrete foundation block is struck in place. It can be connected to a concrete foundation steel bar, which makes it possible to build a highly realistic foundation as a base for a seismic isolation building, and to reduce the number of on-site work steps and shorten the construction period.

According to the method for constructing a base of a base-isolated building according to the third aspect of the present invention, only the foundation of an important part where the base-isolation device is installed is constituted by a precast concrete base block, and the other parts ( The base of the precast concrete foundation block (between the placement sections) is made of cast-in-place concrete, and the precast concrete part and the cast-in-place concrete are joined by a cold joint in a reinforcing steel connection state. Since a foundation for a seismic isolated building with an integral joint structure can be obtained as a whole, a foundation with excellent realism can be constructed as a foundation for a seismic isolated building, and the number of on-site work steps can be reduced and the construction period can be shortened.

According to the method of constructing a base of a base-isolated building according to the present invention, the base plate for the base-isolated device is level-adjusted on the precast concrete body by the adjusting nut, and the upper surface of the precast concrete body and the base plate are adjusted. The structure is filled with non-shrink mortar, and the seismic isolation device can be installed on the precast concrete body with individual level adjustment.

According to the method for constructing a base of a base-isolated building according to the invention, vibration is applied to the non-shrinkable mortar by the vibrator inserted from the vibrator hole formed in the base plate when the non-shrinkable mortar is cast. As a result, the non-shrink mortar is evenly filled between the upper surface of the precast concrete body and the base plate.

[Brief description of the drawings]

FIG. 1 is a plan view showing one embodiment of a base structure of a base-isolated building according to the present invention.

FIG. 2 is an elevation view showing one embodiment of a base structure of a base-isolated building according to the present invention.

3 (a) is a plan view of a portion where a precast concrete foundation block C1 is disposed in a base structure of a base-isolated building according to the present invention, and FIG. 3 (b) is an elevation view of a portion where a precast concrete foundation block C1 is disposed.

FIG. 4A is a plan view of a portion where a precast concrete foundation block C2 is disposed in a foundation structure of a base-isolated building according to the present invention, and FIG. 4B is an elevation view thereof.

FIG. 5 (a) is a plan view of a portion where a precast concrete foundation block C3 is arranged in the foundation structure of the base-isolated building according to the present invention, and FIG. 5 (b) is an elevation view thereof.

FIG. 6 (a) is a plan view of a portion where a precast concrete foundation block C is disposed in a foundation structure of a base-isolated building according to the present invention, and FIG. 6 (b) is an elevation view thereof.

FIG. 7A is a plan view of a portion where a precast concrete base block C5 is disposed in the base structure of a base-isolated building according to the present invention, and FIG. 7B is an elevation view thereof.

FIG. 8A is a plan view of a portion where reinforced concrete foundations F1 and F3 are arranged in the base structure of the base-isolated building according to the present invention, and FIG. 8B is an elevation view thereof.

FIG. 9A is a plan view of a portion where a reinforced concrete foundation F2 is disposed in a base structure of a base-isolated building according to the present invention;
(B) is an elevational view thereof.

10A is a plan view of a precast concrete foundation block according to the present invention, and FIG. 10B is an elevation view thereof.

11A is a cross-sectional view of a base plate arrangement portion for an isolator according to the present invention, and FIG. 11B is a plan view of the base plate.

12A is a cross-sectional view of a base plate disposing portion for a damper according to the present invention, and FIG. 12B is a plan view of the base plate.

FIG. 13 is a sectional view of a base plate arrangement portion for a wind fixing device according to the present invention.

[Explanation of symbols]

C1, C2, C3, C4, C5 Precast concrete foundation block F1, F2, F3 Reinforced concrete foundation D16 Reinforcement A Ancholt B Base plate N10 Adjustment nut

Claims (5)

[Claims] 1. A base structure of a base-isolated building in which an upper structure is installed on a seismic isolation device installed on a foundation and the upper structure is supported by the seismic isolation device. Only the foundation of the part for installing the seismic isolation device is made of precast concrete, and the foundation of the other part between the parts for installing the seismic isolation device is made of cast-in-place concrete, and is integrally joined as a whole. The base structure of a seismically isolated building. 2. A precast concrete base block used for the base structure of a base-isolated building according to claim 1, wherein the base block is made of reinforced concrete and is connected to a reinforcing steel of a concrete base cast in place. Precast concrete foundation blocks for seismic isolation buildings, characterized in that the reinforcing steel is exposed outside the precast concrete body. 3. A method for constructing a foundation of a base-isolated building in which an upper structure is installed on a seismic isolation device installed on a foundation, and the upper structure is seismically isolated and supported by the seismic isolation device. A precast concrete foundation block for installing a seismic isolation device, in which the reinforcing steel is exposed to the outside from the precast concrete body, is placed at a predetermined position on a building site, and the reinforcing steel of the reinforced concrete foundation between the placement parts of the precast concrete foundation block. The reinforcement is connected to the reinforcing steel for fixing the precast concrete foundation block, and the concrete of the reinforced concrete foundation is cast in place between the arrangement portions of the precast concrete foundation block. Construction method of foundation of earthquake building. 4. A precast concrete base block is provided with a plurality of anchor bolts protruding from an upper surface of a precast concrete body, and an adjusting nut is screwed into each of the anchor bolts, and the seismic isolation device is used by the adjusting nut. 4. A non-shrinkable mortar is provided between the upper surface of the precast concrete body and the base plate, wherein a base plate for use is installed on the upper surface of the precast concrete body so as to be adjustable in level. Construction method of foundation of seismic isolation building. 5. A vibrator hole is formed in the base plate, and a vibrator is inserted from the vibrator hole during the setting of the non-shrink mortar to apply vibration to the setting of the non-shrink mortar. A method for constructing a foundation of a base-isolated building according to claim 4.