JP4467353B2 - Column structure - Google Patents

Description

  The present invention relates to a structure of a building, and more particularly, to a structure of a pillar suitable for application to a building where a vibration isolation area is set such as a clean room.

  As is well known, since a production apparatus that dislikes vibration is installed in an ultra-precise environment facility such as a clean room, it is usual to set a vibration-exempt area in consideration of vibration isolation performance. There is no particular problem if the entire independent building can be set as an anti-vibration area, but there must be both an anti-vibration area and a non-vibration area (an area in the general part that does not specifically consider vibration isolation performance) in a common building. In order to block vibration propagation through the structure, it is necessary to structurally cut off both areas. For this purpose, each structure is provided independently and connected to the connection between both structures. Need to have an expansion joint.

In Patent Document 1, as an application example in the case where a railway track is provided in a station building, an inner pillar that independently supports the railway track is provided in a penetrating manner in an outer pillar that is a building structure. A frame structure using a double steel pipe column that prevents vibration propagation from a railway track to a building by directly supporting the track on the ground via an inner column is disclosed.
JP-A-5-148918

  As described above, configuring the anti-vibration area and the non-vibration area in the clean room with independent structures respectively provides both pillars independently at the boundary between the two areas. Since it must be connected by an expansion joint, it is necessary to secure a sufficient space for this purpose, and it is difficult to fit in, and this is disadvantageous in terms of cost. Further, the structure shown in Patent Document 1 is too large and complicated to be applied to a facility such as a clean room, and cannot be applied as it is.

  In view of the above circumstances, an object of the present invention is to provide a suitable column structure by applying it to the boundary portion between a vibration-free area and a non-vibration area in a facility such as a clean room.

  The invention of claim 1 is provided at the boundary between the vibration-extracting area and the non-vibrating area in the building where the vibration-extracting area is set. The structure of the columns to be joined is a double structure consisting of an outer steel pipe and an inner steel pipe, and the column bases of the outer steel pipe and the inner steel pipe are fixed via the base plate, and the beam of the vibration-isolating area or the non-vibrating area One of the beams is joined to the head of the outer steel pipe, and the other is joined to the head of the inner steel pipe through a slit formed in the head of the outer steel pipe. .

  The invention of claim 2 is the column structure of the invention of claim 1, in which the annular space between the outer steel pipe and the inner steel pipe is filled with concrete, and between the inner steel pipe or the outer steel pipe and the concrete, An insulating material for insulation is interposed.

  According to a third aspect of the invention, in the column structure of the second aspect of the invention, the beam of the vibration isolation area is rigidly connected to the head of the outer steel pipe, and the non-vibration area of the head of the inner steel pipe These beams are pin-joined, and an insulating material is interposed between the inner steel pipe and the concrete.

  According to the first aspect of the present invention, the outer steel pipe and the inner steel pipe function as independent steel pipe columns, respectively, and the beam in the vibration-isolating area and the beam in the non-vibrating area are independently joined to each other. The structure of the area and the structure of the non-vibrating area are configured independently of each other, and therefore vibration propagation between them can be avoided by itself, which is particularly effective when two areas are formed at the same floor level. . Moreover, since it is only a single pillar in appearance, it is not necessary to provide two separate pillars at the boundary as in the prior art, and no space or expansion joint is required for this purpose, which is advantageous in terms of cost. It is.

  According to the invention of claim 2, in addition to the above, since the horizontal force is transmitted between the outer steel pipe and the inner steel pipe through the concrete, the entire column behaves as a single unit in the event of an earthquake. It is possible to evaluate, and vibration propagation between the outer steel pipe and the inner steel pipe in normal times can be reliably prevented by the insulating material.

  According to the invention of claim 3, in addition to the above, the outer steel pipe having a cross section larger than that of the inner steel pipe is used as a pillar of the vibration isolation area, and the beam of the vibration isolation area is rigidly joined thereto, and the outer steel pipe is filled in the outer steel pipe. A stiffening effect is obtained by integrating the concrete with the outer steel pipe, and therefore the structure of the vibration-isolating area can be made sufficiently rigid. In addition, the inner steel pipe with a relatively small cross section is used as a pillar in the non-vibrating area, and the beam in the non-exciting area is pin-joined to the concrete. By being electrically insulated, the structure of the non-vibration area can be made relatively flexible compared to the structure of the non-vibration area. Therefore, a clear difference can be given to the vibration characteristics of both structures, and the mutual vibration propagation can be effectively prevented.

  One embodiment of the present invention is shown in FIGS. The present embodiment is an application example to a pillar provided at a boundary portion between a vibration-exempting area and a non-vibrating area (general part) in a clean room, and the main object is that the pillar is constituted by a double steel pipe.

  That is, in the column 1 of the present embodiment, an inner steel pipe 3 made of a rectangular steel pipe having a smaller cross section is coaxially disposed inside the outer steel pipe 2 having a square cross section, and the outer steel pipe 2 and the inner steel pipe 3 are arranged coaxially. The column base is fixed to a common base plate 4, and the base plate 4 is fixed by an anchor 6 to a floor surface via a base mortar 5.

  And as shown to Fig.2 (a), (b), the beam 7 of the anti-vibration area is joined to the head of the outer steel pipe 2 in 3 directions. The beam 7 is joined to the outer steel pipe 2 by rigid joining by welding the upper and lower flanges of the beam 7 via the outer diaphragm 8 and bolting the web via the gusset plate 9.

  As shown in FIG. 2 (b), a longitudinal slit 10 is formed in the other direction of the head of the outer steel pipe 2, and the beam 11 in the non-vibrating area passes through the slit 10 to the head of the inner steel pipe 3. It is assumed that the beam 11 is not in contact with the outer steel pipe 2. The joining of the beam 11 to the inner steel pipe 3 is performed by bolting only the web of the beam 11 to the inner steel pipe 3 via a gusset plate 12 passed through the slit 10. It is essentially a pin joint. In FIG. 1, reference numeral 13 denotes a slab constituting the floor of the non-vibration area, 14 denotes a grating constituting the floor of the non-vibration area, and 15 denotes a joist supporting the grating 14, both of which are the floors. Clearance is secured between them so that they do not touch each other directly.

  Further, as shown in FIGS. 1 and 2 (c), the space 16 between the outer steel pipe 2 and the inner steel pipe 3 is filled with concrete 16 except for the column heads. An insulating material 17 is interposed between the steel pipe 3. Thereby, although the concrete 16 adheres to the inner surface of the outer steel pipe 2 and is structurally integrated, the non-adhered state is maintained by the insulating material 17 on the outer surface of the inner steel pipe 3. And is structurally insulated.

  The column 1 having the structure described above includes an outer steel pipe 2 and an inner steel pipe 3 that function independently as columns in a vibration-isolating area and a non-vibrating area, respectively. The structure of the area and the structure of the non-vibrating area composed of the inner steel pipe 3 and the beam 11 joined thereto can be provided as a completely independent structure, and therefore vibration propagation between them Can be avoided by itself. Moreover, since this pillar 1 is only a single pillar in appearance, it is not necessary to provide two separate pillars as both structures at the boundary as in the prior art. There is no need to provide an expansion joint.

  Further, while the outer steel pipe 2 and the inner steel pipe 3 are structurally independent, the annular space between them is filled with the concrete 16, so that the horizontal force is transmitted to the other via the concrete 16. Therefore, it can be evaluated as an integrated frame in which the entire column 1 behaves as a unit at the time of an earthquake, and has excellent seismic performance as a whole. Of course, not only the concrete 16 is filled, but the insulating material 17 is interposed between the concrete 16 and the inner steel pipe 3, so that the space between the outer steel pipe 2 and the inner steel pipe 3 through the concrete 16 is not limited. Is reliably prevented by the insulating material 16, and the vibration isolating effect during normal operation is not impaired.

  In particular, in the above embodiment, the outer steel pipe 2 having a cross section larger than that of the inner steel pipe 3 is used as a pillar of the vibration-isolating area, and the beam 7 in the vibration-isolating area is rigidly joined to the outer steel pipe 2. Since the steel pipe 2 is naturally integrated and stiffened from the inside, the structure in the vibration-relieving area can be made sufficiently high in rigidity and excellent in vibration characteristics. On the other hand, the structure of the non-vibration area is composed of a column made of the inner steel pipe 3 having a relatively small cross section and a beam 11 pin-connected thereto, and the concrete 16 filled outside the inner steel pipe 3 is insulated. Since the structure 17 is structurally insulated from the inner steel pipe 3 by the material 17, the structure in the non-vibrating area has a flexible structure as compared with the structure in the non-vibrating area, and is therefore relatively easy to vibrate. However, as a result, it is possible to give a clear difference between the vibration characteristics of the two structures, thereby effectively preventing mutual vibration propagation.

  Although one embodiment of the present invention has been described above, the above embodiment is merely an example, and the present invention is, for example, the following depending on the use, scale, form, required vibration characteristics, and other various conditions of the building. Appropriate design changes as listed in (1) can be made. ,

  As in the above embodiment, it is preferable to use the outer steel pipe 2 as a column of the vibration-isolating area and the inner steel pipe 3 as the column of the non-vibrating area, and the above-described advantages can be obtained. It is not a thing, and if necessary, it does not prevent the outer steel pipe 2 from being used as a column in the non-vibrating area and the inner steel pipe 3 as a column in the non-vibrating area. Moreover, the joining form and joining form of the beams 7 and 11 with respect to the outer steel pipe 2 and the inner steel pipe 3 are also arbitrary. Furthermore, what is necessary is just to employ | adopt arbitrarily also about the slab 13, the grating 14, and the joist 15 which are the members which comprise the floor according to a use.

  In the above embodiment, by interposing the insulating material 17 between the inner steel pipe 3 and the concrete 16, the concrete 16 is integrated with the outer steel pipe 2 and insulated from the inner steel pipe 3, but conversely, The insulating material 17 may be interposed between the outer steel pipe 2 and the concrete 16, and the concrete 16 may be integrated with the inner steel pipe 3 to be insulated from the outer steel pipe 2. Thus, the stiffening effect by the concrete 16 can be obtained. Of course, in this case as well, a horizontal force transmission effect can be obtained in the same manner as described above, so that it can be evaluated as an integral frame during an earthquake.

  In the above embodiment, filling of the column head with the concrete 16 is omitted, but the column head may be filled with the concrete 16 as long as both structures are structurally surely cut at the column head. Alternatively, in a case where a desired rigidity can be ensured with only the outer steel pipe 2 and the inner steel pipe 3 and the structure does not allow for mutual transmission of horizontal force, it is possible to completely omit filling of the concrete 16. In that case, naturally, the insulating material 17 is also unnecessary.

  In the above embodiment, the outer steel pipe 2 and the inner steel pipe 3 are both square steel pipes, but both can be round steel pipes or a combination of square steel pipes and round steel pipes can be used. 3 may be a circular steel pipe or vice versa. Of course, if necessary, an octagon or other cross-sectional shape can be used, and in any case, the cross-sectional dimensions and thickness of the outer steel pipe 2 and the inner steel pipe 3 are as independent columns required for each. And the performance required as an integral pillar through the concrete 16 may be set optimally.

  In the above embodiment, the beam 11 in the non-vibration area to be joined to the inner steel pipe 3 is only in one direction. However, if it is necessary to provide the beam 11 in three directions in the same manner as the vibration isolation area, The beam 11 may be joined to the inner steel pipe 3 so as not to interfere with the outer steel pipe 2 which is a column of the vibration-isolating area and the beam 7 in the vibration-isolating area.

  The insulating material 17 may be any material that can insulate the outer steel pipe 2 or the inner steel pipe 3 and the concrete 16 from each other. For example, the material and form of the insulating material 17 such as a sheet-like material or a liquid material may be applied. Absent. Further, if a material having excellent damping performance such as a viscous body or a viscoelastic body is adopted as the insulating material 17 and its thickness is set appropriately, a vibration damping effect (damper effect) can be expected.

  In addition, the construction of the pillar 1 having the above-described structure can be appropriately performed at the site. For example, the outer steel pipe 2 is first built at the site, and then the inner steel pipe 3 to which the insulating material 17 is attached is inserted inside. Or conversely, the inner steel pipe 3 to which the insulating material 17 is attached is first built, and then the outer steel pipe 2 is put on the outside, and then the press-fitting hole formed in the lower part of the outer steel pipe 2 It is possible to adopt a construction procedure in which concrete 16 is press-fitted and filled from 18 (see FIG. 1), and the outer diaphragm 8 and the gusset plate 9 are welded one after another. At that time, if necessary for internal welding or other work, a temporary opening may be provided at an appropriate position of the outer steel pipe 2.

In addition, if a unit in which the outer steel pipe 2 and the inner steel pipe 3 are assembled in advance is manufactured in a factory and then installed in the site, it is more efficient because it is only necessary to fill the concrete on site. Construction is possible. At this time, for example, the following method can be considered as a method for manufacturing the unit in the factory.
The base plate 4 is welded to the column base of the inner steel pipe 3, and the insulating material 17 is attached to the peripheral surface.
A work opening for welding the gusset plate 12 at a later stage is formed in the head of the outer steel pipe 2. Further, a press-fitting hole 18 for the concrete 16 is formed in the lower part of the outer steel pipe 2.
The outer steel pipe 2 is put on the outer side of the inner steel pipe 3, and its column base is welded to the base plate 4 and fixed.
-The gusset plate 12 is welded to the head of the inner steel pipe 3 inside through the working opening formed in the outer steel pipe 2.
The slit 10 is formed in the cover plate for closing the work opening, and the cover plate is welded to the outer steel pipe 2 with the gusset plate 12 passing through the slit 10 to close the opening.
-The outer diaphragm 8 and the gusset plate 9 are welded to the outer steel pipe 2 at the same time (if possible, they may be welded in advance).

Alternatively, the following manufacturing method can be considered.
A slit 10 is formed in the head of the outer steel pipe 2. A base plate 4 is welded to the column base, and an opening for subsequent work is formed in the center of the base plate 4. A press-fitting hole 18 of the concrete 16 is also formed.
-The gusset plate 12 is welded to the inner steel pipe 3, and the insulating material 17 is attached to a surrounding surface. A sub-base plate smaller than the cross section of the outer steel pipe 2 is welded to the column base of the inner steel pipe 3.
The inner steel pipe 3 is inserted into the outer steel pipe 2 and the gusset plate 12 is inserted into the slit 10, and the sub base plate attached to the column base of the inner steel pipe 3 is overlaid on the base plate 4, and they are passed through the opening of the base plate 4. Are fixed by welding or bolt fastening.
-The outer diaphragm 8 and the gusset plate 9 are welded to the outer steel pipe 2 at the same time (other than the outer diaphragm that closes the top may be welded in advance).

  Furthermore, the unit manufactured in the factory as described above may also be filled with concrete 16 at the factory and precasted. In this case, although the transport weight increases, the on-site concrete filling work can be omitted. Become efficient.

It is an elevational view showing an embodiment of the pillar structure of the present invention. It is sectional drawing of each part as well.

Explanation of symbols

1 pillar 2 outer steel pipe 3 inner steel pipe 4 base plate 5 base mortar 6 anchor 7 beam (beam in the vibration-isolating area)
8 Outer diaphragm 9 Gusset plate 10 Slit 11 Beam (Beam in a non-vibrating area)
12 Gusset plate 13 Slab 14 Grating 15 joist 16 Concrete 17 Insulating material 18 Press-fit hole

Claims (3)

  In a building where a vibration isolation area is set, a pillar structure is provided at the boundary between the vibration isolation area and the non-vibration area. The outer steel pipe and the inner steel pipe have a double structure, and the column bases of the outer steel pipe and the inner steel pipe are fixed via the base plate, and either the beam in the vibration-isolating area or the beam in the non-vibrating area is provided. A structure of a column which is bonded to the head of the outer steel pipe and one of the other is bonded to the head of the inner steel pipe through a slit formed in the head of the outer steel pipe.   2. The column structure according to claim 1, wherein an annular space between the outer steel pipe and the inner steel pipe is filled with concrete, and an insulating material is interposed between the inner steel pipe or the outer steel pipe and the concrete. A pillar structure characterized by being worn.   3. The pillar structure according to claim 2, wherein the beam of the vibration isolation area is rigidly connected to the head of the outer steel pipe, and the beam of the non-vibration area is pin-connected to the head of the inner steel pipe. And the structure of the pillar characterized by the insulating material being interposed between the inner steel pipe and the concrete.

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