JP2006070582A - Base isolating construction method for building - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a base isolating construction method for a building by which base-isolation of the building is realized easily and economically by eliminating a need for a temporary support structure. <P>SOLUTION: Substantially horizontal through holes 2, 3 are formed at positions right above and right below a fitting position 1a of a base-isolating device 10 of a column 1 of the building, respectively. A hydraulic jack 7 is arranged in each of the upper and lower through holes 2, 3 and a long moving plate 4 abutting a sliding face 7a of the hydraulic jack 7 is arranged in a piercing manner. The upper and lower moving plates 4 are fixed to hole walls, respectively. The hydraulic jack 7 is fixed to the other side of each of the hole walls. An axial force borne by the column 1 is transferred to the hydraulic jack 7. The base-isolating device 10 is interposed between the upper and lower moving plates 4 and is moved to the fitting position 1a together with the moving plates 4. A cut block 1a' of the column 1 is pushed out together with the moving plates 4 while the base-isolating device 10 moves forward. After the base-isolating device 10 is positioned at the fitting position 1a, face plates 9 above and below the base-isolating device 10 are integrated with the upper and lower columns 1b. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  This invention belongs to the technical field of the seismic isolation method for retrofitting the building to the seismic isolation structure by installing the seismic isolation device in the existing building. The present invention relates to a seismic isolation method for buildings that can be easily and economically replaced.

  The seismic isolation method, which installs a seismic isolation device in an existing building and renovates the building to a seismic isolation structure, usually has a temporary support structure that does not include the seismic isolation device mounting portion on the pillars of the existing building. After mounting the base isolation device after excising the seismic isolation device, attaching the base isolation device to the excised part, replacing the axial force on the temporary support structure with the support by the base isolation device, the temporary support structure Is removed from the building (see, for example, Patent Document 1).

JP 2002-227425 A

  In the technique according to Patent Document 1, it is indispensable to attach a temporary support structure that bears the axial force of a column. However, since this temporary support structure is very large, there is a problem that it is very time-consuming to install and is expensive.

  Further, when the seismic isolation device is replaced due to deterioration of the seismic isolation device, a large temporary support structure has to be attached again, so that the above problem still remains and there is room for improvement.

  An object of the present invention is to provide a building seismic isolation method that can easily and economically isolate a building by eliminating the need for a temporary support structure. The seismic isolation device replacement work is to provide a building seismic isolation method that can be implemented more easily and economically.

As means for solving the above-described problems of the prior art, the building seismic isolation method according to the invention described in claim 1 is as shown in FIGS.
In the seismic isolation method for buildings where a part of the pillar 1 of the building is excised and the seismic isolation device 10 is installed,
Providing substantially horizontal through-holes 2 and 3 at positions immediately above and below the attachment site 1a of the seismic isolation device 10 in the pillar 1 of the building, respectively;
The upper and lower through holes 2, 3 are each provided with a hydraulic jack 7 having a sliding surface 7a, the upper hydraulic jack 7 is installed with the sliding surface 7a facing downward, and the lower hydraulic jack 7 is installed with the sliding surface 7a facing upward, Providing a long moving plate 4 penetrating the sliding surface 7a of the hydraulic jack 7;
Adjusting the distance between the upper and lower moving plates 4 to coincide with the height of the seismic isolation device 10 to be installed, and fixing each moving plate 4 to the hole wall by injecting grout material 6;
Fixing the hydraulic jack 7 to the hole wall on the opposite side, for example, by injecting grout material 6;
Driving the hydraulic jack 7 to change the axial force borne by the pillar 1 to the axial force of the hydraulic jack 7;
Cutting the entire cross section of the column 1 including the through holes 2 and 3 to cause the hydraulic jack 7 to bear all the axial force of the column 1;
Installing the seismic isolation device 10 between the upper and lower moving plates 4, and moving the seismic isolation device 10 together with the moving plate 4 to the attachment site 1a;
Extruding and removing the cutting block 1a ′ of the pillar 1 together with the moving plate 4 along with the advancement of the seismic isolation device 10;
After the seismic isolation device 10 is positioned at the attachment site 1a, the upper and lower face plates 9 of the seismic isolation device 10 are integrated with the upper and lower pillars 1b.

As shown in FIGS. 11 to 14, the invention described in claim 2 is a seismic isolation method for a building described in claim 1.
In the step of extruding and removing the cutting block 1a ′ of the pillar 1 together with the moving plate 4 as the seismic isolation device 10 advances,
The height-adjustable jack 11 is installed on the upper surface plate 9 or the lower surface plate 9 of the seismic isolation device 10, and when the seismic isolation device 10 advances, the cutting block 1a ′ of the column 1 is pushed out by a required distance, and the adjustment is performed. The jack for jack 11 is jacked up to bear a part of the axial force of the pillar 1, and the cutting block 1a ′ is pushed out together with the moving plate 4 as it is.

  The invention described in claim 3 is the seismic isolation method for a building described in claim 1 or 2, as shown in FIGS. Two locations are provided on the left and right of the position immediately above the left, and two locations are provided on the left and right of the position immediately below.

  As shown in FIG. 4A, the hydraulic jack 7 is a pencil case-like shape having a sliding surface 7 a in the seismic isolation method for a building described in any one of claims 1 to 3. As shown in FIG. 4B, the hydraulic jack 7 or the thin plate-like pedestal 17 having the sliding surface 17a is provided with a compact hydraulic jack 7 ′.

The invention according to claim 5 is the seismic isolation method for a building according to any one of claims 1 to 4, wherein the sliding surface 7a of the hydraulic jack 7 has a friction coefficient of 0 by applying a lubricant or the like. 0.02 to 0.03.

The invention described in claim 6 is the seismic isolation method for a building according to any one of claims 1 to 5, wherein the movable plate 4 is a thin plate steel plate, H-shaped steel, or U-shaped steel. It is characterized by being.

  According to the seismic isolation method for a building according to the present invention, the hydraulic jack 7 is built in the upper and lower portions of the mounting portion 1a of the seismic isolation device 10 in the column 1 to bear the axial force of the column 1, and the seismic isolation device 10 Since the cutting block 1a ′ of the attachment site 1a can be removed by sliding it like a brushed-down by the seismic isolation device 10 to be installed, it is not necessary to attach a large temporary support structure that has been essential in the past. Moreover, since the seismic isolation device 10 can be attached while sliding smoothly, the time required for installation can be greatly reduced. Therefore, the building seismic isolation method can be realized easily and economically.

  Further, since the movable plate 4 and the hydraulic jack 7 necessary for the installation work of the seismic isolation device 10 are left as they are, the installation work of the seismic isolation device 10 is completed. 4 and 7 can be used immediately to perform exchange work. Therefore, the replacement work of the seismic isolation device 10 can greatly save labor and is very economical as compared with the installation work.

  The seismic isolation method for a building described in claim 1 is implemented as follows in order to implement a temporary support structure that bears the axial force of a column as unnecessary.

1-10 has shown the construction procedure of the seismic isolation method of the building based on the invention described in Claim 1 in steps.
This building seismic isolation method is a building 1 seismic isolation method in which a part of the pillar 1 of the building is excised and the seismic isolation device 10 is installed. First, as shown in FIGS. Of the casings 1b and 1b excluding the attachment part 1a of the seismic isolation device 10 in the pillar 1, substantially horizontal through holes 2 and 3 are provided at positions immediately above and below the attachment part 1a, respectively.

  The through-holes 2 and 3 in the illustrated example are drilled with a drill or the like, and are provided in a total of four locations, two on the left and right of the position immediately above the attachment site 1a, and two on the left and right of the position immediately below. 3). The through holes 2 and 3 are sized so that a movable plate 4 and a hydraulic jack 7 described later can be sufficiently installed. The horizontal finding area of the through-holes 2 and 3 is such that the compressive stress generated by the axial force of the column 1 acting on the column body (concrete) of the uncut portion is less than the short-term allowable compressive stress level of concrete. It should be noted that the hydraulic jack 7 is implemented in an area that can be sufficiently installed.

  The number of the through holes 2 and 3 is not limited to a total of four, and the moving plate 4 inserted into the through holes 2 and 3 without greatly impairing the axial proof strength of the pillars, On the condition that the seismic isolation device 10 is mounted and slidable, the seismic isolation device 10 can be implemented with two through holes 2 and 3 one by one in the top and bottom, or three by three in the top and bottom. It can also be implemented with the single through holes 2 and 3. It can also be carried out by providing one through hole and two through holes 2 and 3 in the lower part, or two through holes and three in the lower part. .

  Next, as shown in FIGS. 2A, 2B and 3, the upper and lower through holes 2, 3 are respectively provided with a hydraulic jack 7 having a sliding surface 7a, and the upper hydraulic jack 7 with the sliding surface 7a facing downward. The lower hydraulic jack 7 is provided with a sliding surface 7a facing upward, and a long moving plate 4 that is in contact with the sliding surface 7a of the hydraulic jack 7 is provided therethrough.

  The illustrated hydraulic jack 7 has a size that can be inserted into the through-holes 2 and 3 and is so long as to protrude slightly from the column 1 in the horizontal direction (see also FIG. 4A). ) Is used (the invention according to claim 4). Further, it is preferable that the sliding surface 7a of the hydraulic jack 7 is formed with a coefficient of friction of about 0.02 to 0.03 by Teflon (registered trademark) processing or by applying a lubricant. Invention of Claim 5). By the way, the performance of the pencil case jack is about 1,000 to 5,000 kN, the stroke is about 15 to 30 mm, and the general dimensions are preferably an outer diameter of about 190 to 310 mm and a machine height of about 110 to 260 mm. To be implemented.

  In the illustrated example, a thin steel plate is used as the long moving plate 4 that contacts the sliding surface 7a of the hydraulic jack 7. The moving plate 4 is configured to be slidable along the sliding surface 7 a of the hydraulic jack 7. As shown in FIG. 3, a total of four moving plates 4 are provided so as to penetrate one through each of the through holes 2 and 3 provided in a total of four vertically and horizontally. The distance between the left and right of the moving plate 4 is set at an interval that allows the seismic isolation device 10 to be sufficiently placed. The upper and lower intervals of the moving plate 4 are implemented at intervals that substantially coincide with the height of the seismic isolation device 10.

  Note that the hydraulic jack 7 applicable to the present invention is not limited to the pencil-case-shaped hydraulic jack 7, and may be a compact type hydraulic jack designed for reinforcement / repair work of a bridge support portion, for example. Can do. When such a compact type hydraulic jack is used and installed in the through holes 2 and 3, as shown in FIG. 4B, the hydraulic jack is placed on the upper surface of the base 17 having the sliding surface 17a on the lower surface. 7 'is implemented with a configuration in which two (or more) 7' are provided at a required interval (the invention according to claim 4).

  Further, the moving plate 4 is not limited to a thin steel plate, and a steel material such as H-shaped steel or U-shaped steel is arbitrarily selected according to the size (height) of the through holes 2 and 3. (Invention of claim 6).

  Next, the distance between the upper and lower moving plates 4 is adjusted to coincide with the height of the seismic isolation device 10 to be installed, and each moving plate 4 is fixed to the hole wall by injecting grout material 6 or the like ( 2 and 3). Specifically, the support member 5 that supports the upper and lower moving plates 4 maintains the level and spacing of the moving plate 4 between the upper moving plate 4 and the bottom surface of the upper through hole 2. A grouting material (mortar) 6 is injected into the grouting material 6, and the grouting material 6 is injected between the lower moving plate 4 and the upper surface of the lower through hole 3 and fixed to the hole walls of the respective through holes 2 and 3. .

  In this embodiment, the distance between the upper and lower moving plates 4 is adjusted by a support member 5 that supports the moving plate 4 as shown in FIG. Therefore, it is preferable to use a member whose height can be adjusted, such as a screw jack, for the support member 5. The grout material 6 in the illustrated example is preferably an incompressible grout material 6.

  Further, the hydraulic jack 7 is fixed to the hole wall on the opposite side by injecting the grout material 6 or the like. Specifically, the grout material 6 is injected between the upper surface of the hydraulic jack 7 and the upper surface of the upper through-hole 2, and the grout material is interposed between the lower surface of the hydraulic jack 7 and the bottom surface of the lower through-hole 3. 6 is injected and fixed to the hole walls of the respective through holes 2 and 3.

  Thus, the internal structure of the through holes 2 and 3 is such that the grout material 6, the pencil case-shaped hydraulic jack 7, the moving plate 4, and the grout material 6 overlap with each other in order from the top to the bottom with respect to the upper through hole 2. Implemented in configuration. On the other hand, with respect to the lower through-hole 3, the grouting material 6, the moving plate 4, the pencil case-shaped hydraulic jack 7 and the grouting material 6 are overlapped in order from the upper side to the lower side. In short, the internal structure of the upper and lower through holes 2 and 3 in the illustrated example is implemented in a symmetrical arrangement around the seismic isolation device mounting portion 1a.

  Next, after confirming that the grout material 6 has hardened, the hydraulic jack 7 is driven and the axial force borne by the column 1 is replaced with the axial force of the hydraulic jack 7. Subsequently, as shown in FIG. 5A, the entire cross section of the column 1 including the through holes 2 and 3 is cut so that the hydraulic jack 7 bears all the axial force of the column 1. By doing so, the mounting portion 1a of the seismic isolation device is firmly held between the upper and lower hydraulic jacks 7 and is slidable together with the movable plate 7 that contacts the sliding surface 7a of the hydraulic jack 7.

  Next, as shown in FIGS. 6A and 6B, the seismic isolation device 10 is installed between the upper and lower moving plates 4, and the seismic isolation device 10 is moved together with the moving plate 4 to the attachment site 1 a. It is efficient and preferable that the seismic isolation device 10 is installed and implemented at a position closest to the mounting member 1a of the seismic isolation device 10. There are various methods for moving the seismic isolation device 10 in the horizontal direction. For example, there is a method using an extrusion jig such as a lever block.

  Next, as the seismic isolation device 10 moves forward, the cutting block 1 a ′ of the column 1 is pushed out together with the moving plate 4. Specifically, a portion surrounded by a dotted line in FIG. 7 shows the cutting block 1a 'of the pillar 1 that slides when receiving a force from the horizontal direction. The upper and lower hydraulic jacks 7 are respectively integrated with the upper and lower pillars 1b via the grout material 6, and the upper and lower moving plates 4 are integrated with the attachment part 1a of the seismic isolation device 10 via the grout material 6. Has been. Therefore, when the cutting block 1 a ′ of the pillar 1 receives a force from the horizontal direction, the moving plate 4 is pushed out together with the moving plate 4 by sliding on the sliding surface 7 a of the hydraulic jack 7.

  When the cutting block 1a ′ of the column 1 is pushed out together with the moving plate 4 with the advancement of the seismic isolation device 10, the cutting block 1a ′ of the column 1 is gradually pushed out together with the moving plate 4, and the column 1 bears. The axial force of the pillar 1 is gradually borne by the seismic isolation device 10. Finally, the axial force of all the pillars 1 is borne by the seismic isolation device 10, and as shown in FIGS. 8A and 8B, the cutting block 1a ′ of the pillar 1 is removed as if it is a sanding-off. It is.

  Incidentally, since the seismic isolation device 10 and the cutting block 1a ′ of the column 1 bear the axial force of the column 1 while the seismic isolation device 10 is being advanced, the safety due to the axial force is reduced. There is no risk of moments. Moreover, since the friction coefficient of the sliding surface 7a of the hydraulic jack 7 is as very small as 0.02 to 0.03, the bending moment acting on the column 1 by the horizontal force due to friction is very small. Then, at the stage where the cutting block 1a 'of the column 1 is removed, both the seismic isolation device 10 and the hydraulic jack 7 bear the total axial force of the column 1 as shown in FIG.

  After that, after the seismic isolation device 10 is positioned at the attachment site 1a, the upper and lower face plates 9, 9 of the seismic isolation device 10 are integrated with the upper and lower pillars 1 (1b) to complete the building seismic isolation method. (The invention according to claim 1). Specifically, as shown in FIG. 10, the space around the hydraulic jack 7 is filled with the grout material 8 to be integrated with the housing of the pillar 1, and from the upper and lower face plates 9 of the seismic isolation device 10. A bolt (not shown) is screwed into the grout material 8. The bolt may be implemented so as to bear the shearing force acting on the column 1 by being screwed almost simultaneously with the injection of the grout material 8, or can be implemented with a so-called post-installed anchor. The grout material 6 to be injected into the space around the hydraulic jack 7 can be injected by applying a mold, but if a high-concentration grout material 6 is used, the grout is not used. You can also By doing so, the seismic isolation device 10 sandwiched between the upper and lower moving plates 4 can sufficiently exhibit the seismic isolation action without slipping in the horizontal direction during the period of use.

  Therefore, according to the building seismic isolation method described above, since it can be carried out without using the temporary support structure that has been essential in the past, the building can be easily and economically isolated. In addition, regarding the exchanging work of the seismic isolation device 10, the hydraulic jack 7 and the moving plate 4 remain as they are, so that they can be used immediately and can be exchanged as economically and smoothly as possible.

  Incidentally, it is preferable that the movable plate 4 be folded in a structure that can be folded in consideration of the effective use of the space, and folded when not in use.

  FIGS. 11-14 has shown the Example of the seismic isolation method of the building described in Claim 2. FIG. This embodiment is mainly different from the embodiment shown in FIGS. 1 to 10 in the structure of the seismic isolation device 10 and the method of pushing out the seismic isolation device.

  That is, in the stage in which the seismic isolation device 10 in the first embodiment moves forward and the cutting block 1a ′ of the column 1 is pushed and removed together with the moving plate 4, the seismic isolation device 10 according to the second embodiment has the (upper surface plate). 9) The height-adjustable jack 11 is installed on the lower surface plate 9, and when the seismic isolation device 10 moves forward, the cutting block 1a ′ of the column 1 is pushed out a required distance (see FIG. 12). The jack for jack 11 is jacked up to bear a part of the axial force of the pillar 1, and the removal of the cutting block 1a ′ together with the moving plate 4 is further advanced (see FIG. 13).

  Specifically, the seismic isolation device 10 of the illustrated example has a structure in which a small or thin hydraulic jack 11 is integrated with the lower surface of the lower surface plate 9 constituting the seismic isolation device 10, and the hydraulic jack 11 operates. Then, the seismic isolation device 10 is configured to be jacked up in the vertical direction. The hydraulic jack 11 can also be implemented with an integrated configuration by being installed on the upper surface of the upper surface plate 9 constituting the seismic isolation device 10. When the seismic isolation device 10 is installed on the movable plate 4, the hydraulic jack 11 is not operated, and the upper portion of the seismic isolation device 10 and the upper movable plate 4 are not in contact with each other.

  According to the second embodiment, the hydraulic jack 11 is operated even when the distance between the upper and lower moving plates 4 is not exactly the same as the height of the seismic isolation device 10 as compared with the first embodiment. Thus, the axial force of the pillar 1 can be reliably borne and the workability is good. In addition, when removing the cutting block 1a ′ of the column 1, it is necessary to extrude the cutting block 1a ′ a little before pushing out the cutting block 1a ′ while bearing a part of the axial force of the column 1 in advance. A person who bears the axial force of 1 can perform a sliding operation smoothly and has good workability.

  Although the embodiments have been described with reference to FIGS. 1 to 14, the present invention is not limited to the embodiments of the illustrated examples, and design modifications that are usually made by those skilled in the art without departing from the technical idea thereof, Note that it includes a range of application variations.

A is the elevation which showed the stage which provided the through-hole in the vicinity position of the site | part which attaches the seismic isolation apparatus in the column housing about Example 1, B is the same cross-sectional view. A is a side view showing a stage in which a moving plate and a hydraulic jack are provided in the through hole shown in FIG. 1, and B is a cross-sectional view of the same. FIG. 2A is an elevation view illustrating a stage in which a moving plate and a hydraulic jack are provided in the through hole illustrated in FIG. 1. A is a longitudinal sectional view showing the structure of a pencil case-like hydraulic jack, and B is a front view showing another hydraulic jack. A is an elevational view showing a stage in which a moving plate and a hydraulic jack are provided in the through hole shown in FIG. 1 and the column housings on the left and right portions of the through hole are cut away, and B is a side view thereof. C is a cross-sectional view of the same. A is the side view which showed the step which installed the seismic isolation apparatus between the upper and lower moving boards, and B is the cross-sectional view. It is the elevation which showed the site | part which can slide in the column housing. A is the elevation which showed the stage which slid the site | part which attaches the seismic isolation device in the column housing, and installed the seismic isolation device in the attachment site | part of the said seismic isolation device, B is the same cross-sectional view. . A is an elevational view showing a stage where the seismic isolation device is installed at a site where the seismic isolation device is attached. A is an elevational view showing a final stage in which the seismic isolation device is installed at a site to which the seismic isolation device is attached. It is the elevation which showed the stage which slid the site | part which attaches the seismic isolation apparatus in the column housing | casing about Example 2 with the seismic isolation apparatus. It is the elevation which showed the stage which jacked up the seismic isolation apparatus shown in FIG. It is the elevation which showed the stage which slid the site | part which attaches the seismic isolation apparatus in the column housing by the jacked-up seismic isolation apparatus. It is the elevation view which showed the step which installed the seismic isolation apparatus in the site | part which attaches a seismic isolation apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Pillar 10 Seismic isolation device 1a Seismic isolation device installation part 2, 3 Through-hole 7a Sliding surface 7 Hydraulic jack 4 Moving plate 6 Grout material 9 Face plate 1a 'Cutting block 11 Height-adjustable jack 17a Sliding surface 17 Pedestal 7' Hydraulic jack

Claims (6)

In the seismic isolation method for buildings where part of the pillars of the building are removed and seismic isolation devices are installed,
Providing a substantially horizontal through-hole at a position immediately above and below a position where the seismic isolation device is attached to the pillar of the building;
A hydraulic jack having a sliding surface is installed in each of the upper and lower through-holes. Providing a long moving plate penetrating;
Adjusting the distance between the upper and lower moving plates to match the height of the seismic isolation device to be installed, and fixing each moving plate to the hole wall by injecting grout material, etc.
Fixing the hydraulic jack to the opposite hole wall, such as by injecting grout material;
Driving the hydraulic jack to convert the axial force borne by the column to the axial force of the hydraulic jack; and
Cutting the entire cross-section of the pillar including the through-hole and causing the hydraulic jack to bear all axial forces of the pillar;
Installing a seismic isolation device between the upper and lower moving plates, and moving the seismic isolation device together with the moving plate to its attachment site;
Extruding and removing the cutting block of the column together with the moving plate with the advancement of the seismic isolation device;
After positioning the seismic isolation device at its attachment site, integrating the upper and lower face plates of the seismic isolation device with the upper and lower columns;
A seismic isolation method for buildings, characterized by comprising As the seismic isolation device advances, the column cutting block is pushed out together with the moving plate.
Install a jack whose height can be adjusted on the top plate or bottom plate of the seismic isolation device, and when the seismic isolation device advances, push the column cutting block to the required distance and jack up the adjustment jack to make the column The building seismic isolation method according to claim 1, wherein a part of the axial force is borne and the cutting block is pushed and removed together with the moving plate.   3. The building seismic isolation method according to claim 1, wherein two through holes are provided on the left and right of the position immediately above the attachment site of the seismic isolation device and two on the left and right of the position immediately below.   The hydraulic jack is a pencil case-shaped hydraulic jack having a sliding surface, or a compact type hydraulic jack provided on a thin plate-like pedestal having a sliding surface. The seismic isolation method for buildings described in 1.   The sliding surface of the hydraulic jack is formed with a coefficient of friction of about 0.02 to 0.03 by applying a lubricant or the like, and the building exemption according to any one of claims 1 to 4, Seismic construction method. The seismic isolation method for a building according to any one of claims 1 to 5, wherein the moving plate is a thin steel plate, H-shaped steel, or U-shaped steel.

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