JP6838885B2 - Fireproof coating structure of seismic isolation device and fireproof performance reinforcement method of fireproof coating structure of seismic isolation device - Google Patents

Description

The present invention relates to a fireproof coating structure of a seismic isolation device and a method for reinforcing the fireproof performance of the fireproof coating structure of a seismic isolation device.

Conventionally, since the seismic isolation device was located directly above the foundation, the seismic isolation device was not required to have a fireproof structure. However, in recent years, seismic isolation on the middle floor has been widely adopted for the purpose of effectively utilizing the seismic isolation layer, and as a result, a structure equipped with a seismic isolation device on a part of columns such as stigmas and pedestals has been adopted. is increasing. In such a structure in which the seismic isolation device is regarded as a part of the pillar, it is necessary to have a fireproof structure as the pillar including the seismic isolation device, and in order to cope with this, the seismic isolation device is provided with a fireproof coating. Is common.

Horizontal displacement may remain (residual displacement) in the seismic isolated building after an earthquake or strong wind, and at this time, the fireproof coating material of the seismic isolation device also shifts. The maintenance standards for seismic isolated buildings (published by the Japan Seismic Isolation Structure Association) stipulate that the maximum residual displacement of seismic isolated buildings should be 50 mm. The evaluation test was conducted with no horizontal displacement of the seismic isolation device and no displacement of the fireproof coating, and no consideration was given to the fireproof performance in the event of displacement or displacement. There are several types of fireproof coatings for seismic isolation devices, and some types are not easily affected by displacement, but in many cases, the fireproof performance tends to gradually decrease due to displacement or displacement of the fireproof coating material. ..

As a fireproof coating structure for intermediate floor seismic isolation in order to effectively utilize the seismic isolation layer in a seismic isolated building, for example, as shown in Patent Document 1, the stigma seismic isolated building has been certified by the Minister. A technique for using a fireproof coating material for a seismic isolation device is disclosed. Further, as a fireproof coating structure for a seismic isolation device, for example, as in Patent Document 2, a simpler structure in which a fireproof plate is attached so as to surround the seismic isolation device is disclosed. In the structure of Patent Document 2, the refractory plate is divided into upper and lower parts and a slit is provided between them, and the slit portion is displaced to correspond to the movement of the seismic isolation device, and in the event of a fire, the thermal expansion material inserted into the slit portion is used. It expands and closes the slit.

Japanese Unexamined Patent Publication No. 2010-281669 Utility Model Registration No. 3138158 Gazette

In the evaluation test such as ministerial approval used in Patent Document 1, since the seismic isolation device is a part of the pillar, it is evaluated in a state where there is no horizontal displacement of the seismic isolation device and there is no deviation of the fireproof coating. , The fire resistance performance when residual displacement occurs is not considered.

Further, in the fireproof coating structure of the upper and lower split panel system of Patent Document 2, the residual displacement of the seismic isolation device directly affects the displacement of the slit of the fireproof plate (the joint portion between the upper and lower split fireproof coating panels). In the worst case, the gaps in the joints will open, and if the heat expansion material does not block the joints, it is possible that the initially required fire resistance cannot be maintained. Since the upper and lower split panel type fireproof coating structure is highly versatile, a technique for improving the problem that the fireproof performance deteriorates according to the amount of displacement due to the residual displacement has been desired. In addition, even if the existing seismic isolated building is left with residual displacement and the refractory material of the upper and lower split panel type refractory coating structure is displaced, a technology for dealing with the initial fire resistance is desired. It was.

The present invention has been made in view of the above, and provides a structure capable of maintaining the initial fire resistance performance even when a residual displacement occurs in a seismic isolated building in a fireproof coating structure of a vertically divided panel system. It is an object of the present invention to provide a method (construction method) for improving the fire resistance performance in order to satisfy the initial fire resistance performance even in the existing property where the residual displacement occurs.

In the present invention for achieving the above-mentioned object, the upper fire-resistant coating material and the lower fire-resistant coating material arranged together with the seismic isolation device between the upper structure and the lower structure, and the upper fire-resistant coating material and the lower portion. An upper bracket and a lower bracket, which are arranged inside each of the fireproof coating materials and support the upper fireproof coating material and the lower fireproof coating material on the outer periphery of the seismic isolation device, and the upper fireproof coating material and the lower portion. Joints between the upper fireproof performance reinforcing member and the lower fireproof performance reinforcing member provided on each of the fireproof coating materials, the upper fireproof coating material, the upper fireproof performance reinforcing member, the lower fireproof coating material, and the lower fireproof performance reinforcing member. It is a fireproof coating structure of a seismic isolation device, which is provided with a joint material provided in a portion.

According to the present invention, in the fireproof coating structure of the upper and lower split panel type, the initial fireproof performance can be maintained even when the seismic isolated building has residual displacement.

It is a figure which shows the outline of the fireproof coating structure of the seismic isolation device used for a seismic isolation building, and is the figure which shows the initial state before the residual displacement occurs. It is a figure which shows the detail of the fireproof structure part in FIG. FIG. 1 is a diagram illustrating a case where residual displacement occurs. FIG. 3 is a diagram illustrating a state at the time of a fire.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In the figure, the same reference numerals indicate the same or corresponding parts.

FIG. 1 is a diagram showing an outline of a fireproof coating structure of a seismic isolation device used for a seismic isolation building, and is a diagram showing an initial state before residual displacement occurs. FIG. 2 is a diagram showing details of the fireproof structure portion in FIG.

The fireproof coating structure of the seismic isolation device of the present embodiment includes an upper fireproof coating material 3, a lower fireproof coating material 5, an upper bracket 7 and a lower bracket 9, an upper fireproof performance reinforcing member 11 and a lower fireproof performance reinforcing member 13. , The joint material 15 is provided.

The superstructure 21 and the substructure 23 of the building are separated. That is, the upper and lower split panel type fireproof coating structure is a structure in which the seismic isolation device is covered with vertically divided panels in order to follow the displacement, and joints are provided between the upper and lower panels.

The upper fireproof coating material 3 and the lower fireproof coating material 5 are arranged together with the seismic isolation device 25 between the upper structure 21 and the lower structure 23. As an example, the upper structure 21 and the lower structure 23 extend macroscopically in a prismatic shape, that is, the upper fireproof coating material 3 and the lower fireproof coating material 5 are arranged on each of the four surfaces. Has been done. That is, when the upper fireproof coating material 3 and the lower fireproof coating material 5 per surface are set as one set, the seismic isolation device 25 is surrounded by four sets of the upper fireproof coating material 3 and the lower fireproof coating material 5. In 1, the two sets appear, and in FIG. 2, one set appears. As an example, the seismic isolation device 25 is a laminated rubber bearing type.

The upper bracket 7 and the lower bracket 9 are on the inside (seismic isolation device side) of the upper fireproof coating material 3 and the lower fireproof coating material 5, respectively, and on the outside (fireproof coating material side) of the seismic isolation device 25, respectively. Be placed. The upper bracket 7 and the lower bracket 9 each support the upper fireproof coating material 3 or the lower fireproof coating material 5 of the target from the inside of the upper fireproof coating material 3 or the lower fireproof coating material 5 to be supported.

The upper refractory coating material 3 and the lower refractory coating material 5 are fixed to one surface of the corresponding upper bracket 7 and lower bracket 9 by bolts 27, respectively. The bolt 27 penetrates the corresponding upper refractory coating material 3 and the lower refractory coating material 5, and the head of the bolt 27 is outside the corresponding upper refractory coating material 3 and the lower refractory coating material 5 (with the seismic isolation device). The tip of the bolt 27 is screwed into one surface of the corresponding upper bracket 7 and lower bracket 9 which is exposed on the opposite surface) surface. Further, the upper bracket 7 and the lower bracket 9 are supported by the corresponding upper structure 21 or lower structure 23 on one other side or the other two sides, respectively. In this way, the upper bracket 7 and the lower bracket 9 are arranged between the upper fireproof coating material 3 and the lower fireproof coating material 5 and the seismic isolation device 25 in the inward / outward direction (horizontal direction), respectively, and the upper fireproof coating is provided. The material 3 and the lower fireproof coating material 5 are supported on the outer periphery of the seismic isolation device 25.

The upper fireproof performance reinforcing member 11 and the lower fireproof performance reinforcing member 13 are outer surfaces (opposite sides of the seismic isolation device) of the upper fireproof coating material 3 and the lower fireproof coating material 5 at the joint-side end portions 3a and 5a, respectively. It is supported by 3b and 5b. The upper fireproof performance reinforcing member 11 and the lower fireproof performance reinforcing member 13 correspond to each other, for example, by using nails, screws or fireproof adhesives, or by using at least two or more of these nails, screws and fireproof adhesives in combination. It is fixed to the outer surfaces 3b and 5b of the upper refractory coating material 3 or the lower refractory coating material 5. The upper fireproof performance reinforcing member 11 and the lower fireproof performance reinforcing member 13 extend in the front and back directions of the paper surface of FIG. 2 to the same extent as the corresponding upper fireproof coating material 3 and lower fireproof coating material 5. The same is true in other respects.

The joint material 15 is provided at the joint portion between the upper fireproof coating material 3 and the upper fireproof performance reinforcing member 11, and the lower fireproof coating material 5 and the lower fireproof performance reinforcing member 13. As an example, in the illustrated example, the joint material 15 is attached to the upper surface of the lower fireproof coating material 5 and the upper surface of the lower fireproof performance reinforcing member 13.

A gasket 29 is arranged between the lower surface of the upper fireproof coating material 3 and the lower surface of the upper fireproof performance reinforcing member 11 and the upper surface of the joint material 15. The purpose of the gasket 29 is to close the gaps in the joints under normal conditions and prevent dust and the like from entering the inside of the fireproof coating structure. For example, an existing building gasket such as an elastic foam rubber material. Can be applied.

The thickness T of the upper fireproof performance reinforcing member 11 and the lower fireproof performance reinforcing member 13 in the inner and outer directions is 10 mm to 50 mm. In the illustrated example, the upper fireproof performance reinforcing member 11 and the lower fireproof performance reinforcing member 13 have the same thickness. Further, the upper refractory coating material 3 and the lower refractory coating material 5 have uniform thicknesses in the inner and outer directions from the upper surface to the lower surface, respectively, and the upper refractory coating material 3 and the lower refractory coating material 5 have the same thickness. ..

Each of the upper fireproof performance reinforcing member 11 and the lower fireproof performance reinforcing member 13 is made of the same material as the upper fireproof coating material 3 and the lower fireproof coating material 5. For example, the upper fireproof coating material 3 and the lower fireproof coating material 5 are each composed of a calcium silicate plate, and the upper fireproof performance reinforcing member 11 and the lower fireproof performance reinforcing member 13 are also composed of a calcium silicate plate, respectively. It has a good fireproof coating structure because it is easy to install and has high fire resistance. The joint material 15 is a heat-expanding material that expands in the event of a fire to close the gaps in the joints. As the heat-expanding material used for the joint material, for example, so-called expanded graphite in which sulfuric acid or the like is intercalated between layers of scaly graphite is used as a main raw material, and a resin binder or the like is used together with a fibrous material for reinforcement to form a sheet. Processed and molded products are preferable. The joint material 15 may have flexibility.

Next, the operation of this embodiment will be described. As shown in FIG. 1, the seismic isolated building that maintained the initial state includes the superstructure 21, the upper fireproof coating material 3, and the upper fireproof performance reinforcing member 11, and the lower structure 23, the lower fireproof coating material 5, and the lower fireproof coating material 5. The performance reinforcing member 13 is in a state where the horizontal displacement is zero. On the other hand, in a seismic isolated building that has experienced the influence of a strong wind or a strong earthquake, a horizontal displacement may remain between the top and bottom of the seismic isolation device, and as a result, as shown in FIG. 3, the superstructure 21, Residual displacement may occur between the upper fireproof coating material 3 and the upper fireproof performance reinforcing member 11 and the lower structure 23, the lower fireproof coating material 5 and the lower fireproof performance reinforcing member 13. Here, in the above-mentioned fireproof coating structure of the existing seismic isolation device having only the upper fireproof coating material and the lower fireproof coating material having a uniform thickness, when residual displacement occurs, the joints do not overlap and the coating is covered. There is a risk of weaknesses in continuity. On the other hand, in the present embodiment, even if a fire occurs in a state where residual displacement occurs, the joint portion is secured in a state where the upper fire resistance reinforcing member 11 and the lower fire resistance reinforcing member 13 overlap. Since the heat-expanding material arranged in the above expands and closes the joint, the continuity of the fireproof coating can be maintained.

In the present embodiment configured as described above, the following excellent advantages are obtained. That is, in the present embodiment, even if a fire occurs in a state where residual displacement occurs, the joint material closes the joint in a state where the overlap between the fireproof performance reinforcing member and the fireproof coating material is secured, so that the joint is fireproof. The continuity of the coating can be maintained. Further, it can be said that the thickness of the refractory performance reinforcing member in the inward and outward directions is appropriately 10 mm to 50 mm, but it is important to correspond to the allowable residual displacement. In general, the maximum residual displacement according to the maintenance standards for seismic isolated buildings is often 50 mm. Therefore, the thickness of the fireproof performance reinforcing member in the inner and outer directions is sufficient, preferably 30 mm to 30 mm. The required fire resistance can be obtained at 50 mm. Further, it is preferable to set the thickness of the refractory performance reinforcing material in the inner and outer directions so that the gasket 29 can effectively close the joint gap even when residual displacement occurs. In the event of a large residual displacement, in order to more reliably block the joint gap with the gasket 29, the position closest to the innermost part of the joint part composed of the fireproof coating material and the fireproof performance reinforcing material, and the outermost part It is effective to provide gaskets 29 at two locations close to each other so that the gasket 29 can be closed by either the inner side or the outer side even when the residual displacement becomes large. On the other hand, the vertical thickness of the fire-resistant reinforcing member (width of the fire-resistant reinforcing member) is preferably the same as the thickness of the fire-resistant covering material in the inner and outer directions in order to maintain continuity with the fire-resistant covering material. By doing so, it can be fixed to the refractory coating material with sufficient strength.

In addition, a clearance is required inside the fireproof coating material (on the seismic isolation device side) to avoid interference with the seismic isolation device. Therefore, when the fireproof performance reinforcing member is located inside the fireproof coating material, there is a problem that the entire structure (entire circumference of the structure) becomes large accordingly. In particular, in reality, since such a clearance problem exists on all four surfaces, the increase in size that occurs in the entire structure (entire circumference of the structure) can be a big problem. On the other hand, when the fireproof performance reinforcing member is provided on the outside of the fireproof coating material (opposite to the seismic isolation device) as in the present embodiment, the clearance is evaluated with the existing fireproof coating structure. Since the same may be applied, it is possible to maintain the continuity of the refractory coating when the residual displacement occurs as described above, and it is also possible to avoid a large increase in the size of the entire structure.

Further, when the fireproof performance reinforcing member is on the entire outer surface of the fireproof coating material (opposite the seismic isolation device), the fixing of the fireproof performance reinforcing member and the fireproof coating material is performed on the outermost side of the fireproof performance reinforcing member. From the side, you need to insert a longer bolt and screw it into the bracket. However, when the length of the bolt is increased in this way, the accuracy of the screw hole (tap hole) is extremely strictly required for the bracket, which is accompanied by an increase in work cost and an increase in cost related to the strength reinforcement measure of the bracket. In particular, the refractory performance reinforcing member and the refractory coating material must be fastened from the outside rather than from the inside (seismic isolation device side) for the convenience of finally closing the seismic isolation device. The bolt used for is inevitably screwed in a cantilevered state. Therefore, increasing the length of the bolt greatly increases the burden of supporting strength on the bracket. On the other hand, in the present embodiment, the fireproof performance reinforcing member does not exist on the entire outer surface of the fireproof coating material, but exists only on the joint side of the outer surface of the fireproof coating material. .. Therefore, since the fireproof performance reinforcing member can support the fireproof coating material with the bracket as before, the continuity of the fireproof coating should be maintained when the residual displacement occurs as described above. It is possible to avoid a large increase in the size of the entire structure, and it is also possible to avoid an increase in work cost and an increase in cost related to bracket strength reinforcement measures. ..

Although the contents of the present invention have been specifically described above with reference to the preferred embodiments, those skilled in the art may adopt various modifications based on the basic technical idea and teaching of the present invention. It is self-evident.

In addition to providing the fireproof coating structure of the seismic isolation device as described above, the present invention also provides a method for reinforcing the fireproof performance of the fireproof coating structure of the seismic isolation device. That is, the method is performed between the upper structure and the lower structure, inside the upper fire-resistant coating material and the lower fire-resistant coating material arranged together with the seismic isolation device, and the upper fire-resistant coating material and the lower fire-resistant coating material, respectively. A method for reinforcing the fire resistance of a fireproof coating structure of a seismic isolation device, which comprises an upper bracket and a lower bracket that are arranged and support the upper fireproof coating material and the lower fireproof coating material on the outer periphery of the seismic isolation device. The existing upper fireproof coating material supports the new upper fireproof performance reinforcing member and the lower fireproof performance reinforcing member on the outer surface at the joint side end of each of the existing upper fireproof coating material and the lower fireproof coating material. A new joint material is provided at the joint portion between the new upper fireproof performance reinforcing member, the existing lower fireproof coating material, and the new lower fireproof performance reinforcing member.

Further, the mode in which the upper fireproof performance reinforcing member and the lower fireproof performance reinforcing member are provided is not limited to the mode in which the existing upper fireproof coating material and the lower fireproof coating material are retrofitted, and the fireproof performance reinforcing member and the fireproof coating material are provided from the beginning. It may be an embodiment manufactured as an integral body.

3 Upper fireproof coating material, 5 Lower fireproof coating material, 7 Upper bracket, 9 Lower bracket, 11 Upper fireproof performance reinforcing member, 13 Lower fireproof performance reinforcing member, 15 joint material, 21 Upper structure, 23 Lower structure, 25 seismic isolation Seismic isolation device, 27 volts.

Claims (5)

An upper refractory coating material and a lower refractory coating material arranged together with a seismic isolation device between the upper structure and the lower structure,
An upper bracket and a lower bracket that are arranged inside each of the upper fireproof coating material and the lower fireproof coating material and support each of the upper fireproof coating material and the lower fireproof coating material on the outer periphery of the seismic isolation device.
An upper fireproof performance reinforcing member and a lower fireproof performance reinforcing member provided on the upper fireproof coating material and the lower fireproof coating material, respectively.
The joint material provided at the joint portion between the upper fireproof coating material and the upper fireproof performance reinforcing member, the lower fireproof coating material, and the lower fireproof performance reinforcing member, and the joint material.
With
Each of the inner and outer direction of thickness of the upper refractory performance reinforcement member and said lower fire resistance reinforcing member, Ri 10mm~50mm der,
A fireproof coating structure of a seismic isolation device, wherein each of the upper fireproof performance reinforcing member and the lower fireproof performance reinforcing member is made of the same material as the upper fireproof coating material and the lower fireproof coating material. An upper refractory coating material and a lower refractory coating material arranged together with a seismic isolation device between the upper structure and the lower structure,
An upper bracket and a lower bracket that are arranged inside each of the upper fireproof coating material and the lower fireproof coating material and support each of the upper fireproof coating material and the lower fireproof coating material on the outer periphery of the seismic isolation device.
An upper fireproof performance reinforcing member and a lower fireproof performance reinforcing member provided on the upper fireproof coating material and the lower fireproof coating material, respectively.
The joint material provided at the joint portion between the upper fireproof coating material and the upper fireproof performance reinforcing member, the lower fireproof coating material, and the lower fireproof performance reinforcing member, and the joint material.
With
The thickness of each of the upper fireproof performance reinforcing member and the lower fireproof performance reinforcing member in the inward and outward directions is 10 mm to 50 mm.
The upper fireproof performance reinforcing member and the lower fireproof performance reinforcing member are calcium silicate plates, respectively.
The joint material is a fireproof coating structure of a seismic isolation device, which is a heat expansion material. The upper fireproof performance reinforcing member and the lower fireproof performance reinforcing member are respectively on the outer surface of the corresponding upper fireproof coating material on the joint side end, or on the joint portion side end of the lower fireproof coating material. Supported by the outer surface,
The fireproof coating structure of the seismic isolation device according to claim 1 or 2. The seismic isolation device is a laminated rubber bearing type.
The fireproof coating structure of the seismic isolation device according to any one of claims 1 to 3. An upper refractory coating material and a lower refractory coating material arranged together with a seismic isolation device between the upper structure and the lower structure,
An upper bracket and a lower bracket that are arranged inside each of the upper refractory coating material and the lower refractory coating material and support each of the upper refractory coating material and the lower refractory coating material on the outer periphery of the seismic isolation device. It is a method of reinforcing the fire resistance performance of the fire resistance coating structure of the seismic isolation device.
A new upper fireproof performance reinforcing member and lower fireproof performance reinforcing member are supported on the outer surfaces of the existing upper fireproof coating material and the lower fireproof coating material at the joint-side ends.
A new joint material is provided at the joint portion between the existing upper fireproof coating material and the new upper fireproof performance reinforcing member, the existing lower fireproof coating material, and the new lower fireproof performance reinforcing member.
A method of reinforcing the fire resistance performance of the fire resistance coating structure of the seismic isolation device.

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