JP6722444B2 - Seismic isolation structure construction method - Google Patents

Description

The present invention relates to a construction method for a seismic isolation structure in which a seismic isolation target structural unit is supported by a seismic isolation device installed in a seismic isolation device installation unit.

As a construction method for this type of seismic isolation structure, a seismic isolation device installation section is constructed, a seismic isolation device is installed in the seismic isolation device installation section, and the seismic isolation target structural section is installed on the seismic isolation apparatus. It is being built in order.

In this case, if the seismic isolation target structure is a large structure such as a large roof, after the seismic isolation target structure is constructed, the seismic isolation target structure flexes and deforms due to its own weight, and the seismic isolation target structure and seismic isolation device are installed. Deformation such as shearing deformation and residual stress may occur in the seismic isolation device installed between and. If the seismic isolation device after the main installation is deformed or the stress remains, the seismic isolation device will not be able to exhibit its intended seismic isolation performance.

Therefore, as shown in Patent Document 1, a seismic isolation device is temporarily installed with a sliding mechanism interposed in the constructed seismic isolation device installation portion, and the seismic isolation target structure is placed on the seismic isolation device in this temporary installation state. After the seismic isolation device is constructed, the seismic isolation device slides over the seismic isolation device installation part through the sliding mechanism due to the deformation of the constructed seismic isolation target structure part due to its own weight, and then the seismic isolation device is installed. A construction method for permanently installing the installation section has been proposed.

In the construction method described in Patent Document 1, the seismic isolation device after the main installation is deformed by sliding the seismic isolation device along with the deformation of the seismic isolation target structure before installing the seismic isolation device. It is possible to avoid the occurrence of residual stress.

JP 2002-317571 A

In the above-described conventional construction method, the seismic isolation device installation section, the seismic isolation device, and the seismic isolation target structure section have three postures (assembly (Attitude) is changed from the attitude at the time of temporary installation, but due to this change of attitude, the posture of the three parties at the time of main installation is shifted from the predetermined main installation attitude, which results in structural balance of the seismic isolated structure. The inconvenience of collapse may occur.

In view of this situation, the main problem of the present invention is to avoid the occurrence of deformation and residual stress in the seismic isolation device after the main installation, while the seismic isolation device installation section, seismic isolation apparatus, and seismic isolation target structural section The point is to provide a method for constructing a base-isolated structure that can be installed permanently with a predetermined structural balance.

A first characteristic configuration of the present invention is a method for constructing a seismic isolation structure that supports a seismic isolation target structural unit with a seismic isolation device installed in a seismic isolation device installation section,
The seismic isolation device installation section, the seismic isolation device, and the seismic isolation target structural section are changed in posture while supporting the seismic isolation target structural section by the seismic isolation apparatus and a temporary support section provided at a different position. A temporary process to assemble in a possible state,
As the construction progresses, the temporary support force of the temporary support part for the seismic isolation target structure part is removed, and the seismic isolation device installation part, the seismic isolation device, and the seismic isolation target structure part are removed as the temporary support force weakens. after the posture change by the weight of the seismic isolation object structure the door, and a present setting step of fixing the orientation between the seismic isolation device installation unit and the seismic isolation device and the seismic isolation target structure,
In the temporary installation step, predicting a change in posture that occurs due to the weakening of the temporary support force in the subsequent main installation step, and the seismic isolation device installation section, the seismic isolation apparatus, and the seismic isolation target structural section are The point is that it is assembled in a temporary posture in which the posture is changed by a set amount from the main posture in a direction opposite to the posture change direction that occurs in the main installation process.

In other words, according to this configuration, in the temporary process of assembling the seismic isolation device installation unit, the seismic isolation device, and the structure unit to be isolated in a state in which the posture can be changed, the posture change that occurs in the main installation process Since the assembly is performed in a temporary posture in which the posture is changed by a set amount from the predetermined main body posture in the opposite direction, the seismic isolation device installation section, seismic isolation device, and seismic isolation target are installed as the construction progresses after this temporary construction process. By changing the mounting posture with the structure portion, the mounting postures of the three persons can be set to a predetermined main installation posture or a posture close to it while releasing stress.

Then, after that, by fixing the postures of the three persons in the main installation process, the base isolation device installation part, the base isolation device, and the structure part to be isolated are installed in a predetermined main installation position or a position close to that. You can

Therefore, while avoiding deformation and residual stress on the seismic isolation device after main installation, the seismic isolation device installation section, seismic isolation apparatus, and seismic isolation target structure section should be installed in a predetermined structural balance. You can

According to the above configuration, since the posture of the seismic isolation target structural unit can be stabilized by supporting both the seismic isolation device and the temporary support unit, the seismic isolation device installation unit, the seismic isolation device, and the seismic isolation target can be used in the temporary process. The structure portion can be easily assembled in a temporary posture, and the efficiency of construction can be improved. This is particularly useful when the seismic isolation target structure is large.

Even so, the stress acting due to the weakening of the temporary supporting force (for example, jacking down) is released by the posture change of the three members of the seismic isolation device installation part, the seismic isolation device and the seismic isolation target structure part in the temporary state, and its posture Because the assembly postures of the three parties can be changed to the predetermined main body posture or a posture close to it by the change, the three persons can be set to the predetermined main posture or close to it without deformation or residual stress of the seismic isolation device. It can be installed in a posture.

According to a second characteristic configuration of the present invention, in the temporary installation step, the seismic isolation device installation portion and the seismic isolation device are provided with a rotation permitting portion permitting rotational movement and a slide permitting portion permitting slide movement interposed. And the seismic isolation target structure part,
In the main installation step, the seismic isolation device installation portion, the seismic isolation device, and the seismic isolation target structural portion are fixed in a state where they do not rotate and slide.

According to the above configuration, the moment force (moment component) of the stress acting with the progress of construction can be released by the rotation in the rotation permitting portion, and the horizontal force of the stress acting with the progress of construction can be released. Since the (horizontal component) can be released by sliding in the slide allowance portion, it is possible to effectively and efficiently avoid the occurrence of deformation or residual stress in the seismic isolation device.

The rotation-permitting part and the slide-permitting part may be arranged in different positions in the seismic isolation device installation part, the seismic isolation device, and the seismic isolation target structure part, or in the same position. May be.

Side view showing seismic isolation structure in the temporary process Side enlarged view (partial cross-sectional view) showing the base-isolated structure in the temporary process Perspective view showing essential parts of seismic isolation structure Exploded perspective view showing the main part of the seismic isolation structure Plan enlarged view (partial cross-sectional view) schematically showing the seismic isolation structure in the temporary process Enlarged side view (partial cross-sectional view) Enlarged plan view (partial cross-sectional view) schematically showing the attitude change of a base-isolated structure Enlarged side view (partial cross-sectional view) showing the main part of the base-isolated structure in the main installation process

FIG. 1 shows a construction situation of a seismic isolation structure equipped with a seismic isolation device 1, 2 is a concrete pillar head as a seismic isolation device installation portion, 3 is a truss structure for a roof as a seismic isolation target structure portion Parts 4 are temporary support parts provided with a hydraulic jack 4a as a temporary material for construction. In the present embodiment, as the structure of the seismic isolation structure, a roof seismic isolation for isolating the roof is shown as an example, but basic seismic isolation or intermediate seismic isolation may be used.

As shown in FIG. 2, the seismic isolation device 1 includes a deformable portion 1d formed by alternately laminating and bonding a plurality of metal thin plates and rubber thin plates between a pair of upper and lower fixed plates 1a and 1b made of metal or the like. It is composed of a laminated rubber type seismic isolation device having, and is configured to be fixed to the pillar head 2 by a fixing means 14 such as a bolt via a base plate 5 having a fixing anchor 5a on the bottom side. ..

As shown in FIG. 1, FIG. 2, and FIG. 5, the method for constructing a seismic isolation structure according to the present invention assembles a column head 2, a seismic isolation device 1, and a truss structure portion 3 in a temporary posture so that the posture can be changed. As shown in FIG. 8, after changing the postures of the column head 2, the seismic isolation device 1 and the truss structure portion 3 from the temporary posture as the “temporary process” and the progress of the construction as shown in FIGS. 6 and 7. In addition, a "main installation process" for fixing the postures of the column head 2, the seismic isolation device 1, and the truss structure portion 3 is provided. Hereinafter, the specific procedure of this construction method will be described in detail.

(A) Temporary installation process In this temporary installation process, as shown in FIGS. 1, 2, and 5, slide allowance is allowed between the three parts of the column head 2, the seismic isolation device 1, and the truss structure part 3 to allow slide movement. The column head 2, the seismic isolation device 1, and the truss structure unit 3 are assembled in a predetermined temporary posture with the portion 6 and the rotation permitting portion 7 permitting rotational movement interposed.

First, as a first step of the temporary installation process, the seismic isolation device 1 is temporarily installed on the column head 2 with the slide permitting portion 6 interposed between the column head 2 and the seismic isolation device 1. As shown in FIG. 2, the slide permitting portion 6 is composed of a sliding mechanism that slidably supports the seismic isolation device 1, and includes a sliding member 6a made of a low friction material and a sliding plate 6b made of stainless steel. 1 side and the stigma 2 side are arranged separately.

In order to interpose the slide allowance portion 6 between the stilt head 2 and the seismic isolation device 1, as shown in FIGS. 2 and 5, the upper surface of the sill head 2 is dimensioned to have a moving allowance for the anchor 5a for fixing. The fixing anchor 5a of the base plate 5 on the seismic isolation device 1 side is inserted and arranged in each of the mounting holes 2a formed on the bottom surface of the base plate 5 on the seismic isolation device 1 side and the pillar head 2. The seismic isolation device 1 and the base plate 5 are placed on the upper surface of the column head 2 with the sliding member 6a and the sliding plate 6b sandwiched between the upper surface and the upper surface so as to face each other.

In other words, the slide allowance portion 6 slides between the sliding member 6a and the sliding plate 6b, the sliding width of which is the margin around the fixing anchor 5a inside the attached hole portion 2a on the upper surface of the stigma 2, so that the sliding head 6a slides. It is configured to allow sliding movement of the seismic isolation device 1 on the upper surface of the portion 2 while preventing the seismic isolation device 1 from falling off.

Next, as a second step of the temporary installation process, the truss structure portion 3 is temporarily installed on the seismic isolation device 1 with the rotation permitting portion 7 interposed between the seismic isolation device 1 and the truss structure portion 3. Here, the truss structure part 3 is constructed by sequentially assembling the truss members 3A in a state of being supported by the seismic isolation device 1 and the temporary support part 4.

As shown in FIGS. 2 to 4, the rotation permitting portion 7 is composed of a rotation connecting mechanism that rotatably connects the seismic isolation device 1 side and the truss structure portion 3 side, and has a partial cylindrical concave surface portion 7 a on the upper surface. The formed rotating seat 7A and a rotating member 7B having a partial cylindrical convex surface portion 7b formed on the lower surface are mainly configured, and a separation preventing tool 7C for preventing separation of the rotating seat 7A and the rotating member 7B is added. Is configured.

In order to interpose the rotation permitting portion 7 between the seismic isolation device 1 and the truss structure portion 3, the rotating seat 7A is fixed to the pedestal portion 11 on the upper side of the seismic isolation device 1 by a fixing means 8 such as a bolt, The rotating member 7B is supported by the rotating seat 7A, and the rotating member 7B is fixed to a mounting portion on the lower side of the truss structure portion 3 by fixing means (not shown) such as welding.

Further, in a state where the engagement claw 7d formed on the lower end side of the separation prevention tool 7C is engaged with the engaged recessed portion 7e formed on the outer surface of the rotary seat 7A, the separation prevention tool 7C is attached to the rotation member 7B by a bolt or the like. The seismic isolation device 1 and the truss structure portion 3 are prevented from being separated from each other by mounting with the fixing means 10.

In other words, the rotation allowance portion 7 slides between the rotation seat 7A on the seismic isolation device 1 side and the rotation member 7B on the truss structure portion 3 side, so that the rotation allowance portion 7 intersects the long side direction of the truss structure portion 3 in the horizontal direction. It is configured to allow relative rotational movement of the seismic isolation device 1 and the truss structure portion 3 around an axis along the.

Then, in the present construction method, in the above-described first and second procedures, the three postures of the pillar head 2, the seismic isolation device 1, and the truss structure portion 3 are set to the truss structure portion due to the deficiency of the temporary support portion 4. The deformation of the truss structure part 3 due to its own weight (an example of the deformation of the truss structure part 3 due to the progress of construction) should be taken into consideration so that the assembly postures of the three persons become a predetermined main installation posture or a posture close to it in accordance with the deformation that occurs later. Keep in the set temporary posture.

This temporary posture is determined based on the predicted posture change amount of the column head 2, the seismic isolation device 1, and the truss structure unit 3 due to the deformation of the truss structure unit 3 caused when the temporary support force of the temporary support unit 4 is weakened. 6, the predicted slide amount (predicted change length) and the predicted rotation amount (predicted change angle) generated in the rotation allowance unit 7 are calculated in advance, and the predicted slide amount (an example of the set amount) and the predicted rotation amount. It is set based on (an example of the set amount).

In the present embodiment, as the temporary posture, as shown in FIG. 5, the seismic isolation device 1 is opposite to the slide change direction (direction of arrow S in the figure) generated in the main installation process with respect to the upper part of the pillar head 2. In the state where the truss structure section 3 is moved relative to the seismic isolation device 1 in the state of being moved by the predicted slide amount t from the main installation posture, as shown in FIG. It is arranged in a state in which it is rotated by the predicted rotation amount α from the main installation posture in the direction opposite to the arrow R direction).

(B) Main installation process When the temporary installation of the column head 2, the seismic isolation device 1, and the truss structure part 3 is completed, the temporary support part 4 is removed and the temporary support force for the truss structure part 3 is the first step of the main installation process. Weaken. The truss structure portion 3 is flexibly deformed in a state where the temporary support portion of the truss structure portion 3 is lowered due to the desorption of the temporary support force, and as shown in FIGS. 4 and 5, the truss structure portion 3 is flexibly deformed. The seismic isolation device 1 slides along the horizontal direction on the upper part of the column head 2, and as shown in FIG. 6, the truss structure portion 3 rotates on the upper part of the seismic isolation device 1. Due to the sliding movement and the rotational movement, the three members including the column head 2, the seismic isolation device 1, and the truss structure portion 3 are changed to the main installation posture or a posture close thereto.

When the posture change of the three members of the pillar head 2, the seismic isolation device 1, and the truss structure portion 3 is completed, as a second step of the main installation process, as shown in FIG. The seismic isolation device 1 is fixed to the column head 2 by filling with a curable filler 13 such as non-shrink mortar, and a plurality of rotation allowance parts 7 are provided between the seismic isolation device 1 and the truss structure part 3. The seismic isolation device 1 and the truss structure part 3 are fixed by forming a prismatic short column part 9 made of a steel plate by welding or the like. With the above, the main installation of the three parts of the column head 2, the seismic isolation device 1, and the truss structure section 3 is completed.

That is, in the method for constructing a seismic isolation structure according to the present invention, before the postures of the column head 2, the seismic isolation device 1, and the truss structure portion 3 are fixed in the main installation process, the temporary support force by the temporary support portion 4 is weakened. However, since the postures of the column head 2, the seismic isolation device 1, and the truss structure portion 3 are changed from the temporary posture due to this weakness, it is possible to prevent the seismic isolation device A from being deformed or residual stress after the main installation. it can.

Moreover, the temporary posture is set in advance in anticipation of the deformation of the truss structure portion 3 due to the weight of the temporary support portion 4 in the temporary installation process, so that the posture of the column head 2 and the seismic isolation device is changed due to the change in the posture due to the weak force of the temporary support force. 1 and the truss structure part 3 can be set to a predetermined main body installation posture or a posture close thereto, so that in the main installation process, the three parts of the column head 2, the seismic isolation device 1 and the truss structure part 3 are set to a predetermined posture. Due to the structural balance, the main installation can be easily performed.

[Other Embodiments]
(1) In the above-described embodiment, the case where the seismic isolation device installation unit 2, the seismic isolation device 1, and the seismic isolation target structural unit 3 are assembled with the slide permitting unit 6 and the rotation permitting unit 7 interposed in different parts Although the slide permission part 6 and the rotation permission part 7 are provided at the same site (for example, between the seismic isolation device installation part 2 and the seismic isolation device 1 or between the seismic isolation device 1 and the seismic isolation target structural part 3). The seismic isolation device installation unit 2, the seismic isolation device 1, and the seismic isolation target structural unit 3 may be assembled in a state of being interposed.

(2) In the above-described embodiment, the slide allowance portion 6 is interposed between the seismic isolation device installation portion 2 and the seismic isolation device 1, and the rotation allowance is allowed between the seismic isolation device 1 and the seismic isolation target structure portion 3. Although the case where the part 7 is interposed is shown as an example, conversely, the rotation permitting part 7 is interposed between the seismic isolation device installation part 2 and the seismic isolation device 1, and the seismic isolation device 1 and the seismic isolation device 1 are isolated. The slide permitting part 6 may be interposed between the earthquake-targeted structure parts 3.

(3) In the above-described embodiment, the case where the rotation permitting portion 7 is composed of the rotating seat 7A having the partial cylindrical concave surface portion 7a and the rotating member 7B having the partial cylindrical convex surface portion 7b is taken as an example. Although shown, for example, it is possible to allow rotation by including a rotating seat having a partially spherical concave surface portion and a rotating member having a partially spherical convex surface portion, or by compressing one end in the horizontal direction. You may comprise from a rubber plate.

(4) In the above-described embodiment, the temporary support portion 4 changes the postures of the seismic isolation device installation portion 2, the seismic isolation device 1, and the seismic isolation target structure portion 3 with the progress of the construction before the main installation. Although the change in the postures of the three persons due to the weakness of the temporary support force is shown as an example, it may be a change in the postures of the three persons over time.

(5) In the above-described embodiments, the case where the amount of posture change from the main posture in the temporary posture is set to the predicted change amount (prediction slide amount t, predicted rotation amount α) has been described as an example. The predicted change amount may be further multiplied by a safety factor or the like, or may be set as the average change amount in a plurality of cases.

(6) The seismic isolation device installation unit is not limited to the head 1 of the pillar shown in the above-described embodiment, but may be the upper and lower intermediate portions of the pillar, the head of the pile, the seismic isolation pit, or the like.

(7) The seismic isolation target structural portion is not limited to the truss structural portion 2 shown in the above-described embodiment, but may be various structural portions that can be seismic isolated by the seismic isolation device 1, such as a ramen structural portion.

1 Seismic isolation device 2 Seismic isolation device installation section (post)
3 Seismic isolation target structure section (truss structure section)
4 Temporary support part 6 Slide allowance part 7 Rotation allowance part t Set amount (predicted slide amount)
α setting amount (predicted rotation amount)

Claims (2)

A method for constructing a seismic isolation structure that supports a seismic isolation target structure section with a seismic isolation device installed in the seismic isolation device installation section,
The seismic isolation device installation portion, the seismic isolation device, and the seismic isolation target structural portion are changed in posture while supporting the seismic isolation target structural portion on the seismic isolation device and a temporary support portion provided at a different position. A temporary process to assemble in a possible state,
With the progress of the construction, the temporary support force of the temporary support part for the seismic isolation target structure part is removed, and the seismic isolation device installation part, the seismic isolation device, and the seismic isolation target structure part are removed as the temporary support force is weakened. after the posture change by the weight of the seismic isolation object structure the door, and a present setting step of fixing the orientation between the seismic isolation device installation unit and the seismic isolation device and the seismic isolation target structure,
In the temporary installation step, by predicting a change in posture that occurs due to the weakness of the temporary support force in the subsequent main installation step, the seismic isolation device installation section, the seismic isolation apparatus, and the seismic isolation target structure section are Note A method of constructing a base-isolated structure that is installed in a temporary posture in which the posture is changed by a set amount from the main posture in the opposite direction to the posture change direction that occurs during the main construction process. In the temporary step, the seismic isolation device installation portion, the seismic isolation device, and the seismic isolation target structural portion are intervened with a rotation permitting portion permitting rotational movement and a slide permitting portion permitting slide movement. Assembly,
The method for constructing a seismic isolation structure according to claim 1, wherein, in the main installation step, the seismic isolation device installation section, the seismic isolation apparatus, and the seismic isolation target structural section are fixed in a state where they do not rotate and slide. ..

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