JP4786972B2 - Seismic isolation method for existing structures using additional walls - Google Patents

Description

This invention provides a seismic sinker work at existing structure, in the case of seismic sinker by supporting a vertical load of the upper structure by installing a temporary supporting jack or isolator to a position offset from the pillars, the support reaction It belongs to the technical field of countermeasure construction method to transmit force to the superstructure safely and reliably.

Conventionally, in seismic isolation work for existing structures, there are often cases where a temporary jack or seismic isolation device must be installed at a position deviated from a column to support the vertical load of the superstructure.
As a countermeasure method in such a case, conventionally, a support portion by a temporary receiving jack is tensioned by using a PC steel rod and prestress is introduced to increase strength and rigidity. Or the construction method which installs the support by steel materials toward the pillar from the support part by a temporary support jack, and transmits support reaction force to the upper floor is implemented. However, the countermeasure construction method in which the support portion of the temporary receiving jack is tensioned with a PC steel rod and prestress is introduced may not be implemented depending on the surrounding environment, and even if it can be implemented, the construction is troublesome and requires a construction period. Moreover, the support by the steel material must be disassembled and removed after jackdown, which takes time.

Similarly, as a case where a temporary receiving jack or a seismic isolation device must be installed at a position deviated from the pillar, seismic isolation work for an existing elevator shaft can be cited. In particular, there is a problem of how to deal with the case where the lower end (landing level) of the existing elevator shaft protrudes into the seismic isolation layer (seismic isolation pit) and causes so-called interference. Conventionally, in general, the existing foundation is dismantled under the pre-existing pillar, and the foundation is suitable for seismic isolation work, or the landing level of the elevator shaft is not supported by the seismic isolation device. Large construction and remodeling such as raising to a certain height (remodeling) or reducing the size of the elevator car to a dimension that can secure seismic isolation clearance is forced. However, major construction such as remodeling the foundation, raising the landing level of the elevator shaft to a height that does not interfere with support by the seismic isolation device, or reducing the size of the elevator cage to a dimension that can ensure seismic isolation clearance, etc. The construction procedure is complicated and unreliable (dangerous). There are also major problems such as prolonged construction period and rising construction costs.

  In Patent Document 1 below, as a means for changing the support of pillars on the intermediate floor during the seismic isolation work of the building, the support reaction force is passed to the pillars on the upper floor as a means to replace the support of the pillars on the intermediate floor. The countermeasure construction method which installs the jack of 2 or sets up a support work is disclosed.

JP 2004-124579 A

An object of the present invention, the construction is simple, the supporting reaction force of the temporary supporting jack can be reliably transmitted to the upper-floor building frame and the pillar, safety rather high, it can be directly leaving as long as Rikabe allow environmental It saves the trouble of temporary material removal, carried out by newly established additional walls that can take advantage the installation work of the isolator is to provide a MenShinka method of an existing structure which utilizes additional wall.
The next object of the present invention is the seismic isolation work of the existing elevator shaft, particularly in the case where the seismic isolation device is installed at a position deviated from the elevator shaft column and the seismic isolation is performed. If the level) is experiencing the so-called interference protruding to the seismic isolation layer (seismic isolation pit), Toka replaced make the appropriate foundation to MenShinka construction work, any trouble landing level of the elevator shaft to the support by the seismic isolation system Toka raised to no height, or without the need for a large construction and large modification of the Toka to reduce the size of the elevator car to a size that the seismic isolation clearance can be secured, and therefore, the effect of the elevator user is insignificant elevator shaft seismic isolation cormorant rows of construction work, is to provide a MenShinka method of the structure to use the additional wall.

As means for solving the above-described problems of the prior art, the seismic isolation method for an existing structure using the additional wall according to the invention described in claim 1 is:
In the seismic isolation work for existing structures, the temporary jack 4 is installed at a position deviated from the pillar 1 in the seismic isolation layer 2 and the vertical load of the superstructure is changed to the temporary jack 4.
When the upper floor housings 6A and 7A located immediately above the temporary support jack 4 installed at a position deviated from the pillar 1 in the seismic isolation layer 2 cannot support the axial force of the temporary support jack 4, the temporary support jack 4 is provided in advance. An additional wall 8 is newly installed in a part surrounded by the upper floor frame formed by the beam 6A and the slab 7A located immediately above the column 1 and the upper structure formed by the column 1 and the upper beam 6B and the slab 7B. ,
The support 1 of the temporary support jack 4 is transmitted to the upper structure and the pillar 1 with the assistance of the extension wall 8 and the temporary support is supported, so that the pillar 1 in the seismic isolation layer 2 is excised and the post 1 is excised. It is characterized by installing a seismic isolation device 9 in the part and making it seismic isolation.

The seismic isolation method for existing structures using the additional wall according to the invention described in claim 2 is:
The lower end of the existing elevator shaft 20 of the structure is exposed in the seismic isolation layer 2, and the seismic isolation work for the existing structure in which the seismic isolation device 9 is installed at a position deviated from the outer peripheral column 21 of the elevator shaft 20 In
In the case where the seismic isolation device 9 is installed at a position deviated from the outer peripheral column 21 of the existing elevator shaft 20 in the seismic isolation layer 2 to support the vertical load of the upper structure, the upper floor frame located immediately above the seismic isolation device 9 If the support reaction force of the seismic isolation device 9 cannot be fully supported, an additional wall 23 is newly installed in a portion surrounded by the upper-floor frame 22 and the outer peripheral column 21 located immediately above the seismic isolation device 9. Transmitting support reaction force of the seismic isolation device 9 to the superstructure and the outer peripheral column 21 with the assistance of the wall 23;
A reinforcing housing 25 is also added to the lower end of the elevator shaft 20 and supported by the seismic isolation device 9, and further between the pressure-resistant plate 26 newly installed in the seismic isolation layer 2 and the reinforcing housing 25. It is characterized by installing a seismic isolation device 9 for seismic isolation.

Since the seismic isolation method for an existing structure using the extension wall according to the invention described in claim 1 is simply to newly install the extension wall 8 in the existing frame, the construction is simple and easy. By properly designing the strength and rigidity of the extension wall 8 to be newly installed and appropriately constructing it, the support reaction force of the temporary jack 4 can be surely changed from the upper floor housings 6A, 7A to the upper floor housings 6B, 7B and the columns 1 The safety of construction and structure can be reliably increased. Further, as long as the environment permits, the extension wall 8 can be left as it is. Therefore, the trouble of removing temporary materials can be saved, and it can be used until construction and after dredging finally installing the seismic isolation device 9.

According to the seismic isolation method for an existing structure using the additional wall according to the invention described in claim 2, the lower end portion of the existing elevator shaft 20 of the structure is exposed into the seismic isolation layer 2, and the elevator In the seismic isolation work of the structure in which the seismic isolation device 9 is installed at a position deviated from the outer peripheral column 21 of the shaft 20, the foundation is changed to an appropriate foundation for the seismic isolation work, or the landing level of the elevator shaft 20 is isolated. Toka raised to support not hinder the height by the device 9, or a large construction of the Toka to reduce the size of the elevator car to a size that the seismic isolation clearance can be secured, because it does not require a large remodeling, impact on the elevator user (user-friendliness change, deterioration) can be performed the seismic isolation of any no elevator shaft 20. In addition, the construction is small in scale, and seismic isolation that is advantageous in terms of construction period and cost can be achieved .

The invention described in claim 1 is a case in which the temporary load jack 4 is installed at a position deviated from the pillar 1 and the vertical load W is changed in the seismic isolation work of the existing structure. If the Kaimukurotai 6A, 7A are not fully support the axial force of the temporary supporting jacks 4, and Kaimukuro body on which are formed by the beam 6A and slabs 7A of temporary supporting jack directly above position, the pillar 1, the upper floor beams 6B And the extension wall 8 is newly installed in the part enclosed by the upper structure formed with slab 7B .
The support reaction force of the temporary receiving jack 4 is transmitted to the upper structures 6B and 7B and the column 1 with the assistance of the additional wall 8 to be temporarily received and supported. Then, the column 1 in the seismic isolation layer 2 is excised, and the seismic isolation device 9 is installed in the excised part of the column 1 to make it seismic isolation.
In the invention described in claim 2, the lower end portion of the existing elevator shaft 20 of the structure is exposed into the seismic isolation layer 2, and the seismic isolation device 9 is installed at a position deviated from the outer peripheral column 21 of the elevator shaft 20. In the seismic isolation work for structures
In the case where the seismic isolation device 9 is installed at a position deviated from the outer peripheral column 21 of the existing elevator shaft 20 in the seismic isolation layer 2 to support the vertical load of the upper structure, the upper floor frame located immediately above the seismic isolation device 9 When 22 cannot support the support reaction force of the seismic isolation device 9, an additional wall 23 is newly installed in a portion surrounded by the upper-floor frame 22 and the outer peripheral column 21 at a position directly above the seismic isolation device 9. The support reaction force of the seismic isolation device 9 is transmitted to the superstructure and the outer peripheral column 21 with the assistance of the additional wall 23.
Further, a reinforcing housing 25 is added to a lower end portion of the elevator shaft 20 and supported by the seismic isolation device 9, and the pressure plate 26 newly provided in the seismic isolation layer 2 and the reinforcing housing 25 are provided. Install a seismic isolation device 9 between them to make it seismic isolation.

Hereinafter, the present invention will be described based on illustrated embodiments.
First, FIG. 1 shows an embodiment of the invention described in claim 1, and finally the pillar 1 of the existing structure bears in completing the seismic isolation work as shown in FIG. 2. It is necessary to temporarily receive the vertical load W, and to provide the seismic isolation layer 2 with a seismic isolation device mounting portion in which the column 1 is removed.
In preparation for this, FIG. 1 shows a position on the column base 3 that is deviated from the column 1, that is, a position that can secure a work space necessary for the work of excising the column 1 and providing the seismic isolation device mounting portion. A stage where the provisional jack 4 is installed and the vertical load W is changed is shown. Therefore, the jack stand 5 is constructed on the column base 3, and the upper floor case formed by the beam 6 </ b> A and the slab 7 </ b> A located immediately above the temporary support jack 4 , the column 1, and the upper floor case. An extension wall 8 is newly provided in a portion surrounded by the upper structure formed by the beam 6B and the slab 7B.

In short, as a countermeasure when it is diagnosed that the upper floor housings 6A, 7A directly above the temporary receiving jack 4 cannot support the axial force P of the temporary receiving jack 4 (the proof stress is insufficient) The support reaction force P of the temporary support jack 4 is transmitted to the column 1 and the upper structure, and the vertical load is replaced by the temporary support jack 4, and the seismic isolation work for the existing structure is performed safely and reliably. .
Therefore, the additional wall 8 is newly provided with a structure having sufficient strength and rigidity to transmit the support reaction force P when the vertical load is changed by the temporary receiving jack 4 to the column 1 and the upper structure. Further, the position where the extension wall 8 is newly installed is to transmit the supporting reaction force P when the vertical load is changed by the temporary support jack 4 to the column 1 and the beam 6B and the slab 7B of the upper structure which is the upper structure. It is only necessary to be an effective part, and it does not ask about the installation location and the installation range.

Kaimukurotai 6A on the right above to provisionally received by the jack 4 to the Figure 1, the After 7A temporary receiving support, in the seismic isolation layer 2, the isolator mounting portion provided by cutting the column 1, FIG. The seismic isolation work for installing the seismic isolation device 9 is advanced as shown in Fig. 2, and the procedure is the same as the known technology.
In that case, the extension wall 8 starts from the time when the vertical load is changed by the temporary support jack 4, and after the seismic isolation device 9 is installed as shown in FIG. It is preferable to use it as a wall. This is advantageous because it saves the labor and cost of dismantling and removal.
In addition, the code | symbol 10 in FIG. 2 shows the damper (an example of illustration is a wall type viscous body damper) indispensable for a seismic isolation system. Reference numeral 11 is a pressure-resistant version of the new.

Next, FIGS. 3 and 4 show an embodiment of the invention described in claim 2.
In this embodiment, when the lower end (landing level) of the existing elevator shaft 20 of the existing structure protrudes into the seismic isolation layer 2 and causes interference, the landing level of the elevator shaft 20 is not changed. Moreover, the Example of the countermeasure construction method which performs seismic isolation work is shown, without changing an elevator shaft dimension. As shown in FIG. 4, it is also an embodiment under the condition that the seismic isolation device 9 is installed at a position (bias amount e) deviated from the outer peripheral column 21 of the existing elevator shaft 20 to support the vertical load of the superstructure. .
In the case of the present embodiment, as a matter of course, the upper floor frame 22 located immediately above the seismic isolation device 9 (reference numeral 22 in the illustrated example indicates an underground floor slab) supports the support reaction force of the seismic isolation device 9. Assuming that it is diagnosed that there is no proof stress , an additional wall 23 is newly installed in the part surrounded by the upper-floor frame 22 and the pillar 21, and the support reaction force of the seismic isolation device 9 is supported by this additional wall 23. Is transmitted to the upper structure and the pillar 21 (not shown). As a matter of course, a reinforcing housing 25 having a sufficient strength to receive the supporting force of the seismic isolation device 9 is also provided at the lower end portion of the existing elevator shaft 20 and receiving the supporting force of the seismic isolation device 9. The shaft 20 is newly provided in a form protruding to the side of the shaft 20 in a cantilever form having a length satisfying the above-described deviation amount e.

Also in the case of the present embodiment, the extension wall 23 is constructed with a structure having sufficient strength and rigidity to transmit the support reaction force of the vertical load by the seismic isolation device 9 to the column 21 and the upper structure. The position where the additional wall 23 is newly installed does not matter whether the installation place or the installation range is effective as long as it is effective in transmitting the support reaction force by the seismic isolation device 9 to the column 21 and the upper structure. .
Assuming the above configuration, seismic sinker construction of the elevator shaft 20 by isolator 9, placing the seismic isolation device 9 to between the breakdown voltage plate 26 and the reinforcing skeleton 25, which was newly established to isolation layer within 2 can be realized by, I need not name to change the implantation level deliberately. Further, there is no need to change the dimensions of the existing elevator shaft 20, and the construction can be performed safely and with good procedures.

  Although the present invention has been described above based on the illustrated embodiment, the present invention is not limited to the above embodiment. It should be noted that the present invention can be implemented in various modes without departing from the object, gist and technical idea of the present invention.

It is the elevation which showed Example 1 of this invention. It is an elevation which shows the state which completed the seismic isolation. It is the elevation which showed Example 2 of this invention as the III-III arrow line view of FIG. It is a top view which shows the elevator shaft part of the existing structure.

1 Pillar 4 Temporary jack W Vertical load 6A, 7A Upper floor frame (beam and slab)
6B, 7B Further upper beam and slab 8 Additional wall P Jack axial force 9 Seismic isolation device
20 Existing elevator shaft
21 Pillar 22 Upper-floor frame 23 Additional wall
25 New reinforcement frame
26 New pressure plate

Claims (2)

In the seismic isolation work for existing structures, a temporary jack is installed at a position deviated from the pillar in the seismic isolation layer, and the vertical load of the superstructure is changed to the temporary jack.
Formed in advance with beams and slabs located directly above the temporary support jack when the upper floor of the temporary support jack installed at a position deviated from the pillar in the seismic isolation layer cannot support the axial force of the temporary support jack. An additional wall will be installed in the part surrounded by the upper floor frame, pillars, and the upper structure formed by the upper floor beams and slabs ,
The support reaction force of the temporary support jack is transmitted to the superstructure and the column with the assistance of the extension wall, and the column in the seismic isolation layer is excised, and the seismic isolation device is installed in the excision part of the column. A seismic isolation method for existing structures using additional walls, characterized by installation and isolation. In the seismic isolation work of the existing structure where the lower end of the existing elevator shaft of the structure is exposed in the seismic isolation layer and the seismic isolation device is installed at a position deviated from the outer peripheral column of the elevator shaft,
When the seismic isolation device is installed at a position deviated from the outer peripheral column of the elevator shaft in the seismic isolation layer to support the vertical load of the superstructure, the upper floor frame directly above the seismic isolation device supports the seismic isolation device. If that can not support the reaction force, the support reaction force of the to Kaimukurotai and the outer column and the portion surrounded by on the isolator position immediately above established the extension wall, the isolator in assistance by this additional wall Transmitting to the superstructure and the outer peripheral column,
At the lower end of the elevator shaft that is supported by the seismic isolation device, a reinforcing housing is added, and a seismic isolation device is installed between the newly installed pressure-resistant plate in the seismic isolation layer and the reinforcing housing. A seismic isolation method for existing structures using additional walls, characterized by seismic isolation.

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