JP6211303B2 - Seismic isolation method for existing buildings and temporary structure under construction - Google Patents

Description

  The present invention is a work in the period from the formation of the installation space of the seismic isolation device to the completion of the installation of the seismic isolation device in the installation space, even when a temporary material that bears the column axial force has trouble, The present invention relates to a seismic isolation method for an existing building that can be constructed with high safety, easy work, and a simple temporary configuration, and a temporary structure under construction.

  Patent Literature 1 and Patent Literature 2 are known as methods for incorporating a seismic isolation device into an existing pillar of an existing building to make the existing building seismic isolation. In “existing building seismic isolation method and seismic isolation device” of Patent Document 1, a predetermined range is removed from an outer periphery of an existing column, and a center portion of the column is left to form a stepped portion. Support the vertical force during seismic isolation at the center of the remaining column. A lower pedestal is fixed at the lower position of the stepped portion, and a seismic isolation device divided into a plurality of parts is installed on the lower pedestal. An upper base is fixed on the seismic isolation device and connected to the upper position of the stepped portion. After that, a sleeve tube is used from the outside of the upper pedestal, and the upper part of the central part of the column is crushed and separated from the existing column. Subsequently, if the sleeve tube is used from the outside of the lower pedestal and the lower part of the central part of the pillar is crushed and discharged to the outside, the central part of the pillar will slide down under its own weight. By repeating this work, the center part of the pillar remaining in the stepped portion is removed, and the load applied to the existing pillar is received by the seismic isolation device.

  In “Building Seismic Isolation Method” of Patent Document 2, a substantially horizontal through hole is provided at a position directly above and below a position where a seismic isolation device is attached to a pillar of a building. A hydraulic jack is installed in the upper and lower through-holes, and a long moving plate that comes into contact with the sliding surface of the hydraulic jack is provided so as to penetrate therethrough. The upper and lower moving plates are fixed to the hole wall. The hydraulic jack is fixed to the hole wall on the opposite side. The axial force borne by the column is changed to the axial force of the hydraulic jack. A seismic isolation device is installed between the upper and lower moving plates, the seismic isolation device is moved to the attachment site together with the moving plate, and the column cutting block is pushed out together with the moving plate as the seismic isolation device advances. After positioning the seismic isolation device at its attachment site, the upper and lower face plates of the seismic isolation device are integrated with the upper and lower columns.

Japanese Patent Laid-Open No. 10-176426 JP 2006-70582 A

  When installing a seismic isolation device on an existing column, it is necessary to cut and remove the column part where the seismic isolation device is installed. When the column part is cut, the support function of the column axial force by the existing column itself is lost, and there is a concern about safety. Therefore, a temporary material that temporarily supports the column axial force is installed.

  In Patent Document 1, since the seismic isolation device is installed in a state where the pillars that are temporary materials remain, it is preferable in terms of safety, but it takes much time to crush and discharge the remaining portion. In Patent Document 2, since the removal of the cutting block and the movement of the seismic isolation device are performed simultaneously, it is preferable in terms of safety as in Patent Document 1, but if the hydraulic jack serving as a temporary material is troubled, the cutting block and the seismic isolation device It becomes difficult to work on. In addition, it takes time and effort to form a through hole or to install a moving plate.

  The present invention was devised in view of the above-described conventional problems, and the work in the period from the formation of the installation space for the seismic isolation device to the completion of the installation of the seismic isolation device in the installation space is borne by the column axial force. Even if there is a problem with temporary materials to be built, there is a seismic isolation method for existing buildings that can be constructed with high safety and easy work, with a simple temporary structure, and a temporary structure under construction. The purpose is to provide.

  The seismic isolation method for an existing building according to the present invention includes a bracket adding step of surrounding an upper part and a lower part excluding an intermediate part and providing an upper bracket and a lower bracket, and the upper bracket and the lower part. A temporary column axial force support member is provided between the brackets, and the temporary column axial force support member supports the column axial force in place of the existing column, and the intermediate portion of the existing column is excised. And a cutting process for forming an installation space for installing the seismic isolation device between the downward cutting surface and the upward cutting surface appearing in the upper portion and the lower portion of the existing pillar, and the downward direction on the upward cutting surface. A temporary support member installation process for installing a temporary support member that can temporarily receive a column axial force with a slight gap from the cut surface, and removing the temporary support member to make a seismic isolation in the installation space. Insert the device and the seismic isolation device Including a seismic isolation device installation step of fixing the upper and lower parts of the existing column, and a column axial force transfer step of transferring the column axial force from the temporary column axial force support member to the seismic isolation device. Features.

In addition, the seismic isolation method for an existing building according to the present invention includes a bracket extension step of surrounding an upper part and a lower part excluding an intermediate part and providing an upper bracket and a lower bracket in an existing pillar, and the upper bracket and A temporary column axial force support member is provided between the lower brackets, and the temporary column axial force support member supports the column axial force in place of the existing column, and an intermediate portion of the existing column. A cutting step for forming an installation space for installing the seismic isolation device between the downward cutting surface and the upward cutting surface appearing in the upper part and the lower part of the existing pillar, and the downward cutting surface directly above Facing the upper cut surface with a slight gap, and a lower step material installed on the upper cut surface is attached directly below, and is detachable from the upper and lower step materials. Provided, pillar A temporary support member installation step for installing a temporary support member capable of temporarily receiving force, and removing the temporary support member in the installation space to install a seismic isolation device on the lower material and below the upper material. A seismic isolation device installation process for inserting and installing the seismic isolation device to the upper part and the lower part of the existing column, and a column for transferring the column axial force from the temporary column axial force support member to the seismic isolation device And an axial force transfer step.
Furthermore, the seismic isolation method for an existing building according to the present invention includes a bracket extension step of surrounding an upper part and a lower part excluding an intermediate part and providing an upper bracket and a lower bracket, and the upper bracket, A temporary column axial force support member is provided between the lower brackets, and the temporary column axial force support member supports the column axial force in place of the existing column, and an intermediate portion of the existing column. A cutting step for forming an installation space for installing the seismic isolation device between the downward cutting surface and the upward cutting surface appearing in the upper part and the lower part of the existing pillar, and the downward cutting surface directly above The upper material facing is attached, and the lower material installed on the upward cut surface is attached directly below, and the upper material and the lower material are detachably provided, and are extendable and extendable. Above Temporary support member installation step for installing a temporary support member for temporarily receiving a column axial force by contacting the material with the downwardly cut surface, and removing the temporary support member in the installation space And installing the seismic isolation device on the lower stage material and below the upper stage material, and fixing the seismic isolation device to the upper part and the lower part of the existing column, and the temporary column shaft. A column axial force transfer step of transferring the column axial force from the force support member to the seismic isolation device.

In the provisional support member installation step, when the provisional support member is extended and the upper end portion or the upper material is brought into contact with the downward cutting surface, the preload corresponding to the column axial force is applied to the temporary support member that can be extended. It is characterized by introducing.

  A lower base plate for installing a seismic isolation device is integrally attached to the lower tier material.

  An upper base plate for installing a seismic isolation device is integrally attached to the upper material.

  In the seismic isolation device installation step, the upper material and the lower material are embedded in concrete that fixes the seismic isolation device to an upper portion and a lower portion of the existing column.

  The temporary structure during construction of the seismic isolation method for the existing building according to the present invention is the temporary structure during construction of the seismic isolation method for the existing building described above, and is provided between the upper bracket and the lower bracket. A temporary column axial force support member that supports a column axial force in place of the existing column, and the downward cut surface and the upward cut that appear in an upper portion and a lower portion of the existing column by cutting an intermediate portion of the existing column A temporary support member is provided between the surfaces, which is installed on the upward cut surface with a slight gap with respect to the downward cut surface, and can temporarily receive the column axial force.

Moreover, the temporary structure during the seismic isolation method construction of the existing building according to the present invention is the above-described temporary structure during the seismic isolation method construction of the existing building, between the upper bracket and the lower bracket. Provided, a temporary column axial force support member that supports the column axial force in place of the existing column, and an upper stage material that faces the downward cut surface directly above and separates a slight gap with respect to the downward cut surface is attached. A lower stage material installed on the upward cut surface is provided directly below, and is provided detachably with respect to the upper stage material and the lower stage material, and provided with a temporary support member that can temporarily receive the column axial force. It is characterized by that.
Furthermore, the temporary structure during the seismic isolation method construction of the existing building according to the present invention is the above-described temporary structure during the seismic isolation method construction of the existing building, between the upper bracket and the lower bracket. A lower column that is provided on a temporary column axial force support member that supports the column axial force in place of the existing column, and an upper material that faces the downward cut surface directly above and is installed on the upward cut surface directly below A material is attached and is detachably provided to the upper and lower tier materials, and is extendable and stretched so that the upper tier material is brought into contact with the downward cut surface, thereby generating a column axial force. A provisional support member for provisional reception is provided.

The temporary support member is extended and a preload corresponding to a column axial force is introduced when an upper end portion of the temporary support member is brought into contact with the downward cut surface.

  In the seismic isolation method of the existing building according to the present invention and the temporary structure under construction, work in the period from the formation of the installation space of the seismic isolation device to the completion of the installation of the seismic isolation device in the installation space is performed. Even if the temporary material bearing the column axial force is troubled, it can be constructed with high safety, easy work, and simple temporary structure.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view showing an example of an existing building to which a preferred embodiment of a seismic isolation method for an existing building and a temporary structure under construction according to the present invention is applied. It is an AA arrow directional view in FIG. 1 which shows the bracket construction | assembly stage of the bracket expansion process of the seismic isolation construction method of this embodiment constructed with respect to the existing building shown in FIG. It is a BB arrow directional view in FIG. 1 which shows the bracket construction | assembly stage of the bracket expansion process of the seismic isolation construction method of this embodiment constructed with respect to the existing building shown in FIG. FIG. 4 is a BB line arrow view in FIG. 1 showing a pre-stress introduction stage in the bracket expansion process following FIG. 2 and FIG. 3. FIG. 5 is a perspective view of a prestress introduction stage illustrated in FIG. 4. FIG. 6 is a BB line arrow view in FIG. 1 showing a column axial force temporary support step following FIG. 4 and FIG. 5. It is an AA arrow directional view in FIG. 1 which shows a cutting process following FIG. It is a perspective view which shows a mode that the temporary support member was installed in the temporary support member installation process following FIG. It is a BB arrow directional view in Drawing 1 showing signs that a lower baseplate was inserted in a seismic isolation device installation process following Drawing 8. FIG. 10 is a view taken along the line B-B in FIG. 1, showing a state where the lower base plate is fixed and the base isolation device and the upper base plate are further inserted in the seismic isolation device installation step, following FIG. 9. It is a BB arrow directional view in FIG. 1 which shows a mode that the upper side baseplate was fixed in the seismic isolation apparatus installation process following FIG. FIG. 12 is a view taken along the line B-B in FIG. 1, showing a state in which the seismic isolation device is fixed in the seismic isolation device installation process following FIG. 11. It is a BB arrow directional view in FIG. 1 which shows a mode that the tension material was removed in the pillar axial force transfer process following FIG.

  Hereinafter, a preferred embodiment of a seismic isolation method for an existing building and a temporary structure during the construction according to the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 shows a plan view of an example of an existing building to which the seismic isolation method for an existing building according to the present invention and a temporary structure under construction are applied.

  This existing building 1 is constructed in a flat plate shape having an extremely long long side and a high height with respect to the short side direction. However, the present invention is not limited to such a flat building 1 and can be preferably applied to any building. In the example of illustration, the construction method and temporary structure of this invention are employ | adopted for the existing pillar 2 enclosed with (circle). The existing pillar 2 may be of any structure type such as RC structure, SRC structure, concrete-filled steel pipe pillar.

  2 to 13 show a seismic isolation method for an existing building according to the present embodiment, including a temporary structure under construction, according to a construction procedure. FIG. 2 and FIG. 3 show the bracket construction stage in the bracket extension process as the first process. FIG. 2 is a view taken along line AA in FIG. FIG. 3 is a BB line arrow view in FIG. 1.

  In the bracket construction stage, the reinforced concrete portions 3a and 3b to be the brackets are formed on the existing pillar 2. Reinforced concrete portions 3a and 3b are located below the existing column 2 and the upper portion 2b of the existing column 2 joined to the beam 4 and the existing column 2 except for the intermediate portion 2a in the height direction of the existing column 2. It is formed surrounding the portion 2c.

  Both the upwardly-increase cast concrete portion 3a and the downwardly-increase cast concrete portion 3b are constructed by arranging reinforcing bars in the formwork built around the existing pillar 2 and filling the concrete. Reinforced concrete parts 3a and 3b are not limited to RC structures, but may be SRC structures.

  In particular, the downwardly reinforced concrete portion 3b is constructed with a space between the floor slab 5 and the floor slab 5 so that no load is applied to the floor slab 5 or the lower floor beam. The upwardly reinforced concrete portion 3a may also be constructed with a gap between the beam 4 and the like so as not to cause a load on the beam 4 and the floor slab of the upper floor.

  When constructing the reinforced concrete portions 3a and 3b, a plurality of sheath tubes (not shown) for inserting the tension material are embedded vertically and horizontally in the horizontal direction and in multiple stages in the vertical direction. Thereby, a plurality of through holes 6 are formed in the reinforced concrete portions 3a and 3b. These through holes 6 are formed at positions close to the column surface of the existing column 2.

  4 and 5 show a pre-stress introduction stage in the bracket expansion process. 4 is a perspective view taken along the line BB in FIG. 1, and FIG. 5 is a perspective view showing a state in which prestress is introduced into the upper and lower increased concrete portions 3a and 3b corresponding to FIG. is there.

  In the pre-stress introduction stage, pre-stress is introduced into the tendon 7 inserted through each through hole 6. The introduction of the prestress is well known. For example, the other end 7b of the tension member 7 having the one end 7a fixed thereto is pulled through the washer 8 to the reinforced concrete portions 3a and 3b, whereby the tension member 7 is in tension. In this state, the other end 7b of the tendon member 7 is fixed to the additional cast concrete portions 3a and 3b via the washer 8.

  As a result, prestress is introduced into the reinforced concrete portions 3a and 3b. Both ends of the tendon 7 become fixing ends 7a and 7b for the reinforced concrete portions 3a and 3b. When prestress is introduced into the upper and lower reinforced concrete portions 3a and 3b, the upper portion 2b and lower portion 2c of the existing pillar 2 and the upper and lower reinforced concrete portions 3a and 3b are in close contact with each other in a frictional contact state, and are high. Exhibits unity.

  FIG. 6 shows a column axial force temporary support step. 6 is a BB line arrow view in FIG. In the column axial force temporary support step, a jack 9 that is expanded and contracted in the vertical direction as a temporary column axial force support member that supports the column axial force in place of the existing column 2 around the existing column 2 of the existing building 1 is provided. Arranged. An axial force support member other than the jack 9 may be employed.

  The jacks 9 are arranged at the four corners of the upper and lower reinforced concrete portions 3a and 3b surrounding the existing pillar 2 so as to surround the existing pillar 2 from the outside. The jack 9 is a dedicated member that is installed between the upper and lower reinforced concrete portions 3a and 3b and receives and supports the column axial force acting from above.

  FIG. 7 shows the excision process. FIG. 7 is a view taken along line AA in FIG. In the excision step, the intermediate portion 2a of the existing pillar 2 is excised to form an installation space P for installing the seismic isolation device. The existing pillar 2 is cut immediately above the downwardly-increasing concrete portion 3b and directly below the upwardly-increasing concrete portion 3a, and the cut intermediate portion 2a is removed by a conveying means 14 such as a forklift.

  By cutting away the intermediate portion 2a, a downward cut surface 2d appears at the lower end of the upper portion 2b of the existing column 2, and an upward cut surface 2e appears at the upper end of the lower portion 2c of the existing column 2. A column-free seismic isolation device installation space P is formed between the downward cut surface 2d and the upward cut surface 2e.

  In addition, as shown in FIG. 7, when making the existing building 1 seismic isolation, the slit 11 which divides | segments the said wall 10 up and down is formed so that the wall 10 may not disturb a seismic isolation action. When the wall 10 is divided, the resistance in the horizontal direction is lost. Therefore, in order to secure the strength in the horizontal direction, a temporary horizontal restraining plate 12 made of metal such as steel is attached.

  The temporary horizontal restraint plate 12 is stretched vertically between the upper wall portion 10a and the lower wall portion 10b, and is fixed to the wall portions 10a and 10b with bolts 13. If necessary, a temporary brace that supports the horizontal force may be installed. The temporary horizontal restraint plate 12 and the temporary brace are removed when the seismic isolation device becomes operable in a later process.

  FIGS. 8 to 11 show an example of the construction from the temporary support member installation process to the seismic isolation apparatus installation process. FIG. 8 is a perspective view of a state in which the temporary support member 15 is installed in the installation space P. FIGS. 9 to 11 are sequentially attached to the lower base plate 16 for installing the seismic isolation device and to construct the lower casing 17. 1. It is a BB line arrow directional view in FIG. 1 which shows the attachment of upper base plate 18, construction of the upper housing 19, and the fixing step of the seismic isolation device 20.

  FIG. 8 shows a temporary support member installation process. A temporary support member 15 that can temporarily receive the column axial force is installed on the upward cut surface 2e with a slight gap X with respect to the downward cut surface 2d. (See FIG. 9).

  During seismic isolation construction, the following critical situations are assumed. For example, the prestress is introduced and the additional cast concrete portions 3a, 3b and the existing pillar 2 are integrated, but the frictional contact between them is broken by the column axial force acting through the jack 9, and the downward increase is made. There is a possibility that the cast concrete portion 3b moves downward with respect to the lower portion 2c of the existing pillar 2, or the upper portion 2b of the existing pillar 2 increases upward and shifts downward with respect to the cast concrete portion 3a. Further, the jack 9 cannot support the column axial force, and the upper portion 2b of the existing column 2 may be shifted downward together with the upwardly-increased concrete portion 3a.

  In such a case, when the downward cut surface 2d is lowered, the downward cut surface 2d comes into contact with the temporary support member 15 on the upward cut surface 2e, and the temporary support member 15 is located below the upper portion 2b of the existing pillar 2 and below. The column axial force is temporarily received between the portions 2c, and the column axial force is transmitted from the upper portion 2b of the existing column 2 to the lower portion 2c, thereby ensuring safety during seismic isolation construction. .

  The temporary support member 15 temporarily applies the column axial force during the period from the formation of the installation space P of the seismic isolation device 20 to the completion of installation of the seismic isolation device 20 in the installation space P (see FIGS. 7 to 12). It is installed so that it can be received.

  As described above, the temporary support member 15 may be installed on the upward cut surface 2e with a slight gap X from the downward cut surface 2d. In this embodiment, the seismic isolation device 20 can be installed and installed. In order to make the temporary support member 15 good, an upper material 21 facing the downward cut surface 2d is attached immediately above the temporary support member 15, and a lower material 22 installed on the upward cut surface 2e is attached just below it. The temporary support member 15 is detachably provided on the upper and lower materials 21 and 22. Therefore, the temporary support member 15 is installed on the upward cut surface 2e with the gap X from the downward cut surface 2d via the upper step member 21 and the lower step member 22.

  In order to facilitate the installation of the seismic isolation device 20, the upper surface of the lower material 22 is set to the installation level of the seismic isolation device 20, and the lower surface of the upper material 21 is set to the upper surface level of the seismic isolation device 20. The height of the receiving support member 15 is set slightly higher than the height of the seismic isolation device 20. In the illustrated example, the temporary support member 15, the upper stage material 21 and the lower stage material 22 are all formed of a metal rectangular parallelepiped block such as steel, and these are stacked and joined in three stages in the vertical direction. Configure the pillar.

  The temporary support member 15 and the upper member 21 and the lower member 22 are detachably joined by bolt joining or the like. In consideration of unevenness of the upward cut surface 2e, the lower material 22 may be provided with unevenness adjustment legs. Considering a dimensional error between the upward and downward cut surfaces 2d and 2e, the temporary support member 15 may be provided with a height adjusting means.

  As shown in FIG. 8, when the installation of the temporary support member 15 provided with the upper stage material 21 and the lower stage material 22 is completed, the process proceeds to the seismic isolation device installation process as shown in FIGS. 9 to 11. First, as shown in FIG. 9, the lower base plate 16 for installing the seismic isolation device is installed. At this time, the temporary support member 15 and the upper material 21 are removed leaving only the lower material 22. The annular lower base plate 16 is inserted into the installation space P and attached using the space vacated by the removal of the temporary support member 15 and the like.

  Next, as shown in FIG. 10, concrete is placed on a formwork assembled around the lower base plate 16 to construct the lower housing 17. A lower tier material 22 is embedded in the lower housing 17. When constructing the lower housing 17, the temporary support member 15 and the upper material 21 are installed on the lower material 22 as necessary, so that the column axial force can be supported. In that case, it is preferable to install the temporary support member 15 and the upper material 21 simultaneously with the installation of the lower base plate 16.

  Next, the base isolation device 20 and the upper base plate 18 for installing the base isolation device are installed. When the temporary support member 15 and the upper material 21 are installed, only the temporary support member 15 is removed. The upper material 21 is attached to the upper base plate 18. Then, the annular seismic isolation device 20 is inserted on the lower step material 22 embedded in the lower housing 17, and then the annular upper base plate 18 with the upper step material 21 attached is inserted on the seismic isolation device 20. Install. The installation procedure of the seismic isolation device 20 and the upper base plate 18 may be reversed.

  Next, as shown in FIG. 11, concrete is placed on a mold formed around the upper base plate 18 to construct an upper frame 19. An upper material 21 is embedded in the upper housing 19. Thereafter, when the curing of the upper housing 19 and the lower housing 17 is completed, the seismic isolation device 20 in the installation space P is bolted to the housings 17 and 19, whereby the seismic isolation device 20 is connected to the upper portion 2 b of the existing column 2 and It fixes to the lower part 2c.

The lower base plate 16 may be integrally attached to the lower stage material 22 in advance at the stage of the provisional support member installation process .

In any case, the temporary support member 15 is removed, and the upper material 21 and the lower material 22 are embedded in the concrete (the casings 17 and 19) that fixes the seismic isolation device 20. Until the seismic isolation device 20 is fixed to the upper portion 2b and the lower portion 2c of the existing pillar 2, the role of the temporary support member 15 is replaced between the downward cut surface 2d and the upward cut surface 2e.

  FIG. 12 shows a column axial force transfer process. FIG. 12 is a BB line arrow view in FIG. In the column axial force transfer process, the seismic isolation device 20 is put into an operating state. The jack 9 is contracted and removed from the installation space P. Thereby, the column axial force is transferred from the jack P to the seismic isolation device 20. By transferring the column axial force to the seismic isolation device 20, the existing column 2 in which the seismic isolation device 20 is incorporated recovers the original column function. At this time, if the existing pillar 2 cannot be seismically isolated, it is desirable to install a temporary seismic isolation device horizontal restraint plate (not shown) in order to restrain the horizontal displacement of the seismic isolation device 20. .

  FIG. 13 is a view taken along line BB in FIG. As shown in FIG. 13, the tendon material 7 is also removed at this stage as needed. Further, the temporary horizontal restraint plate 12 and the temporary brace are removed at an appropriate timing. Thus, the seismic isolation construction of the existing building 1 is completed.

  In the seismic isolation method of the existing building according to the present embodiment described above and the temporary structure under construction thereof, the upper part 2b and the lower part 2c excluding the intermediate part 2a are surrounded by the existing pillar 2, A bracket expansion process for providing an upwardly reinforced concrete portion 3a and a downwardly reinforced concrete portion 3b, and a jack 9 is provided between the upwardly reinforced concrete portion 3a and the downwardly reinforced concrete portion 3b. The column axial force temporary support step for supporting the column axial force, and the intermediate portion 2a of the existing column 2 is cut out, and the downward cut surface 2d and the upward cut surface 2e appearing in the upper portion 2b and the lower portion 2c of the existing column 2 In addition, the excision process for forming the installation space P for installing the seismic isolation device 20 and the upward axis of the cut surface 2e, with a slight gap X with respect to the downward plane of cut 2d, A temporary support member installation process for installing the temporary support member 15 that can temporarily receive the temporary support member 15, the temporary support member 15 is removed, and the seismic isolation device 20 is inserted into the installation space P. 2 including a seismic isolation device installation step for fixing to the upper portion 2b and the lower portion 2c of the column 2 and a column axial force transfer step for transferring the column axial force from the jack 9 to the seismic isolation device 20. As a temporary structure during the construction of the seismic isolation method, a jack 9 is provided between the upwardly-increasing concrete portion 3a and the downwardly-increasing concrete portion 3b, and supports the column axial force in place of the existing column 2, and the existing column 2 The intermediate cutting portion 2a is cut away, and the upward cutting surface 2d and the upward cutting surface 2e appearing in the upper portion 2b and the lower portion 2c of the existing pillar 2 are separated by a slight gap X with respect to the downward cutting surface 2d. 2e up In the period from the formation of the installation space P of the seismic isolation device 20 to the completion of the installation of the seismic isolation device 20 in the installation space P. Even if the work is troubled in the upwardly-increasing concrete portion 3a, the downwardly-increasing concrete portion 3b, and the jack 9 that bear the column axial force, the temporary support member 15 that can temporarily receive the column axial force is used. Construction can be performed with a high safety and an easy operation of installing and removing the temporary support member 15 and a simple temporary structure in which only the temporary support member 15 is added.

  The temporary support member 15 is provided with an upper material 21 facing the downward cut surface 2d immediately above, and a lower material 22 installed on the upward cut surface 2e immediately below, and the upper material 21 and the lower material 22 are attached to the temporary support material 15. On the other hand, the temporary support member 15 is detachably provided, and the seismic isolation device 20 is installed on the lower material 22 and the upper material 21 by removing the temporary support member 15 in the seismic isolation device installation process. Therefore, the seismic isolation device 20 is moved into the installation space P in accordance with the removal of the temporary support member 15 without being affected by the dimension between the upward and downward cut surfaces 2d and 2e and the unevenness of the cut surfaces 2d and 2e. It can be inserted smoothly.

  Since the lower base plate 16 is integrally attached to the lower tier member 22 or the upper base plate 18 is integrally attached to the upper tier member 21, the lower tier member 22 and the upper tier member 21 attached to the temporary support member 15. By simply installing in the installation space P, the base plates 16 and 18 can be attached to the installation space P, and labor saving and shortening of work period can be achieved.

  When the cross section of the lower housing 19 or the upper housing 17 is larger than the cross section of the existing column 2, the upper and lower increased concrete portions 3a and 3b bear a part of the column axial force even after the end of the column axial force transfer process. There is a risk of problems similar to those during seismic isolation construction. In the above embodiment, the upper stage material 21 and the lower stage material 22 are embedded in the upper casing 17 and the lower casing 19, and even if there is a problem in the downwardly reinforced concrete portion 3b, through the upper stage material 21 and the lower stage material 22, The lower part 2c of the existing column 2 can bear the column axial force.

  In the seismic isolation device installation process, the upper material 21 and the lower material 22 are embedded in the concrete that fixes the seismic isolation device 20 to the upper part 2b and the lower part 2c of the existing pillar 2. The removal work becomes unnecessary, and labor saving and shortening of the work period can be achieved, and the strength of the upper housing 19 and the lower housing 17 directly above and below the seismic isolation device 20 can be improved.

  In the said embodiment, although it decided to provide a space | gap between the downward reinforcement concrete part 3b and the floor slab 5, or between the upward reinforcement concrete part 3a, the beam 4, and the floor slab of the upper floor, In the case where a part of the load of the reinforced concrete portions 3a and 3b can be borne, there may be no gap. In this case, the temporary support member 15 is installed in a state of being substantially in contact with the downward cut surface 2d.

  In the above embodiment, the temporary support member 15 is installed on the upward cut surface 2e with a slight gap X with respect to the downward cut surface 2d. You may make it use the jack etc. which can be expanded-contracted to an up-down direction. The retractable temporary support member 15 is installed on the upward cut surface 2e in the temporary support member installation step, and then extended so that the upper end portion of the temporary support member 15 contacts the downward cut surface 2d. . Thereby, the temporary support member 15 can always transmit force from the upper part 2b of the existing pillar 2 to the lower part 2c, and further improve the safety in the period until the seismic isolation device 20 functions. Can do.

  Further, when the telescopic support member 15 that can be expanded and contracted is used, when the temporary support member 15 is extended and the upper end is brought into contact with the downward cut surface 2d in the temporary support member installation step, the temporary support member that can be extended is used. A preload corresponding to the column axial force may be introduced into the member 15. By introducing the preload, the column axial force can be borne by the temporary support member 15 from the installation stage of the temporary support member 15, and the safety of the temporary structure during the seismic isolation work can be further improved. it can.

  In the above embodiment, the case where the base plates 16 and 18 are used has been described as an example, but the base plates 16 and 18 may not be used. In this case, the lower housing 17 may be constructed at the stage where the lower tier material 22 is installed or at the stage where the seismic isolation device 20 is installed on the lower tier material 22. Further, the upper housing 19 may be constructed in a state where the upper material 21 is installed on the seismic isolation device 20.

2 Existing column 2a Middle part of existing column 2b Upper part of existing column 2c Lower part of existing column 2d Down-cut surface 2e Up-cut surface 3a Upward-increase concrete portion 3b Down-increase-concrete portion 9 Jack 15 Temporary support member 16 Lower base plate for seismic device installation 17 Upper housing 18 Upper base plate for seismic isolation device installation 19 Lower housing 20 Seismic isolation device 21 Upper material 22 Lower material P Installation space X Clearance

Claims (11)

A bracket extension process in which an upper bracket and a lower bracket are provided to surround an upper part and a lower part excluding an intermediate part in an existing pillar,
A column axial force temporary support step of providing a temporary column axial force support member between the upper bracket and the lower bracket, and allowing the temporary column axial force support member to support a column axial force instead of the existing column;
Cutting the intermediate portion of the existing pillar, and forming an installation space for installing the seismic isolation device between the downward cutting surface and the upward cutting surface appearing in the upper part and the lower part of the existing pillar, and
A temporary support member installation step for installing a temporary support member that can temporarily receive a column axial force on the upward cut surface with a slight gap with respect to the downward cut surface;
Removing the temporary support member, inserting a seismic isolation device into the installation space, and fixing the seismic isolation device to an upper part and a lower part of the existing pillar; and
A seismic isolation method for an existing building, comprising: a column axial force transfer step of transferring column axial force from the temporary column axial force support member to the seismic isolation device. A bracket extension process in which an upper bracket and a lower bracket are provided to surround an upper part and a lower part excluding an intermediate part in an existing pillar,
A column axial force temporary support step of providing a temporary column axial force support member between the upper bracket and the lower bracket, and allowing the temporary column axial force support member to support a column axial force instead of the existing column;
Cutting the intermediate portion of the existing pillar, and forming an installation space for installing the seismic isolation device between the downward cutting surface and the upward cutting surface appearing in the upper part and the lower part of the existing pillar, and
An upper stage material that faces the downward cut surface directly above is provided with a slight gap with respect to the downward cut surface, and a lower step material that is installed on the upward cut surface is provided directly below, and these upper stage materials and A provisional support member installation step for installing a provisional support member that is provided detachably with respect to the lower material and can temporarily receive the column axial force;
Inside the installation space, the temporary support member is removed and a seismic isolation device is inserted on the lower material and below the upper material, and the seismic isolation device is installed on the upper part and the lower part of the existing column. Fixing seismic isolation device installation process;
A seismic isolation method for an existing building, comprising: a column axial force transfer step of transferring column axial force from the temporary column axial force support member to the seismic isolation device. A bracket extension process in which an upper bracket and a lower bracket are provided to surround an upper part and a lower part excluding an intermediate part in an existing pillar,
A column axial force temporary support step of providing a temporary column axial force support member between the upper bracket and the lower bracket, and allowing the temporary column axial force support member to support a column axial force instead of the existing column;
Cutting the intermediate portion of the existing pillar, and forming an installation space for installing the seismic isolation device between the downward cutting surface and the upward cutting surface appearing in the upper part and the lower part of the existing pillar, and
An upper material facing the downward cutting surface is attached directly above, a lower material installed on the upward cutting surface is attached immediately below, and is detachably attached to the upper material and the lower material, and is expanded and contracted. A temporary receiving support member installation step for installing a temporary receiving support member for temporarily receiving a column axial force by being extended and contacting the downward cut surface with the upper stage material;
Inside the installation space, the temporary support member is removed and a seismic isolation device is inserted on the lower material and below the upper material, and the seismic isolation device is installed on the upper part and the lower part of the existing column. Fixing seismic isolation device installation process;
A seismic isolation method for an existing building, comprising: a column axial force transfer step of transferring column axial force from the temporary column axial force support member to the seismic isolation device. In the provisional support member installation step, when the provisional support member is extended and the upper end portion or the upper material is brought into contact with the downward cutting surface, the preload corresponding to the column axial force is applied to the temporary support member that can be extended. The seismic isolation method for an existing building according to claim 3, wherein: The seismic isolation method for an existing building according to any one of claims 2 to 4 , wherein a lower base plate for installing a seismic isolation device is integrally attached to the lower material. The seismic isolation method for an existing building according to any one of claims 2 to 5 , wherein an upper base plate for installing a seismic isolation device is integrally attached to the upper material. In the seismic isolation device placing step, any claim 2-6, wherein said that the upper member and the lower member is embedded the seismic isolation device in the concrete during the fixing to the upper and lower portions of the existing pillar Seismic isolation method for existing buildings as described in that section . A temporary structure during construction of the seismic isolation method for the existing building according to claim 1,
A temporary column axial force support member provided between the upper bracket and the lower bracket and supporting a column axial force instead of the existing column;
The upward cut surface with a slight gap between the downward cut surface and the upward cut surface appearing in the upper part and the lower part of the existing column when the intermediate part of the existing pillar is cut off A temporary structure during construction of a seismic isolation method for an existing building, characterized in that it is provided with a temporary support member that is installed above and capable of temporarily receiving column axial force. A temporary structure during construction of the seismic isolation method for the existing building according to claim 2 ,
A temporary column axial force support member provided between the upper bracket and the lower bracket and supporting a column axial force instead of the existing column;
An upper stage material that faces the downward cut surface directly above is provided with a slight gap with respect to the downward cut surface, and a lower step material that is installed on the upward cut surface is provided directly below, and these upper stage materials and A temporary structure during construction of a seismic isolation method for an existing building, comprising a temporary support member provided detachably with respect to a lower material and capable of temporarily receiving a column axial force. A temporary structure during construction of the seismic isolation method for the existing building according to claim 3 ,
A temporary column axial force support member provided between the upper bracket and the lower bracket and supporting a column axial force instead of the existing column;
An upper material facing the downward cutting surface is attached directly above, a lower material installed on the upward cutting surface is attached immediately below, and is detachably attached to the upper material and the lower material, and is expanded and contracted. An exemption for an existing building, comprising: a temporary support member for temporarily receiving a column axial force by being extended and contacting the downward cutting surface with the upper material. Temporary structure during construction of seismic construction method. The temporary receiving support member, when the upper end or the upper member is in contact with the downward cut surface is extended, according to claim 10, characterized in that the preload of the corresponding column axial force is introduced Temporary structure during construction of seismic isolation method for existing buildings.

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