JP2015031085A - Fireproof structure of steel column and fireproof partitioning wall structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fireproof structure of steel columns and a fireproof partitioning wall structure in which cost can be reduced by decrease of the number of man-hours and decrease of materials, and an indoor space can be made wide.SOLUTION: A first floor layer of a building is covered by one board of a fireproof panel 10 with ribs in which at least one surface of the surface exposed to the interior of a room of a steel column 3 has ribs 14 extending in the panel height direction over the whole of the height direction. The upper part of the fireproof panel 10 with the ribs is supported to a notch groove 16 formed in the upper end surface by fitting the upper part rotor wheel 4 of the building. The fireproof panel 10 with the ribs serves as a portion of a partition wall for housing the steel column 3.

Description

  The present invention relates to a fireproof structure of a steel column and a fireproof partition wall structure.

  In steel-framed fire-resistant buildings, fire-resistant coating work using fire-resistant coating material applied to structural members for the purpose of protecting structural members such as columns and beams from thermal deterioration during a fire, and installation of normal partition walls Construction is underway. Each of these works is performed for a different purpose and is treated as a separate and independent structure and is carried out individually by each specialized contractor. That is, conventionally, it has been usual to treat these as separate and independent structures.

JP 2002-70208 A Japanese Patent No. 2784461

  Conventionally, two works, a fireproof covering work for a structural member and an installation work for a fireproof partition wall, are required, and there is a problem of cost increase due to a large number of man-hours and materials. In addition, in the case where the structural member is housed in the partition wall, the fireproof coating material to be attached to the structural member and the fireproof wall material as the partition wall are laminated on the outside of the structural member, and there is a problem in narrowing the indoor space. It becomes.

  The problem to be solved by the present invention is to provide a fireproof structure and a fireproof partition wall structure of a steel column that can reduce costs by reducing man-hours and materials, and can widen an indoor space.

  In order to solve the above-described problems, the fireproof structure of a steel column according to the present invention has ribs extending in the panel height direction over the entire height direction of at least one surface exposed to the interior of the steel column in one level of the building. It is covered by a single plate with a ribbed fireproof panel, and the upper part of the ribbed fireproof panel is supported by inserting the upper runner of the building into a notch groove formed in the upper end surface thereof. Is.

  In this case, it is desirable that both the surface of the steel column exposed in the room and the surface exposed in the opposite room are covered by a single plate of the fireproof panel with ribs over the entire height direction.

  In addition, it is desirable that the convex portion by the rib of the ribbed fireproof panel is disposed at a position avoiding a portion projecting to the indoor side of the steel column. For example, it is desirable that the steel column is disposed between the convex portions formed by the ribs of the ribbed fireproof panel. Alternatively, it is desirable that the steel column is H-shaped steel, and a convex portion by a rib of the ribbed fireproof panel is disposed in the concave portion of the H-shaped steel.

  The fireproof partition wall structure according to the present invention has a ribbed fireproof panel in which at least one of the surfaces exposed to the interior of the steel column has ribs extending in the panel height direction over the entire height direction in one level of the building. The fireproof panel with ribs is covered with a single plate and becomes a part of the partition wall, and the upper part of the fireproof panel with ribs is supported by inserting the upper runner of the building into the notch groove formed in the upper end surface It is the gist of what is being done.

  According to the fireproof structure of a steel column according to the present invention, in one level of a building, at least one of the exposed surfaces of the steel column has ribs extending in the panel height direction over the entire height direction. Since the upper part of the ribbed fireproof panel is supported by inserting the upper runner of the building into the notch groove formed on the upper end surface, it is covered with a single plate of the panel. Since the horizontal joint does not open to the fireproof panel with ribs that covers the surface of the steel column even when the pillars expand and contract, fire resistance can be maintained with this one fireproof panel with ribs. Thereby, this fireproof panel with a rib can serve not only as a fireproof covering material for a steel column but also as a partition wall for accommodating the steel column.

  Then, by simply covering the surface exposed to the interior of the steel column with this ribbed fireproof panel, it is possible to simultaneously perform the fireproofing work and the installation work of the fireproof partition wall on the surface exposed to the interior of the steel column. Cost can be reduced by reducing material. In addition, with respect to the surface exposed to the interior of the steel column, the interior space is not narrowed more than necessary by stacking the fireproof covering material and the fireproof wall material. can do.

  Then, if both the surface of the steel column exposed in the room and the surface exposed in the opposite room are covered with a single sheet of fireproof panel with ribs over the entire height direction, man-hours and materials are reduced. The effect of cost reduction and the effect of widening the indoor space are further enhanced.

  Moreover, if the convex part by the rib of a fireproof panel with a rib is arrange | positioned in the position which avoided the part which has protruded to the room inner side of the steel column, the effect which enlarges indoor space further increases.

  According to the fireproof partition wall structure according to the present invention, at least one of the surfaces exposed to the interior of the steel column in one level of the building has ribs that have ribs extending in the panel height direction over the entire height direction. Since the upper part of the ribbed fireproof panel is supported by inserting the upper runner of the building into the notch groove formed on the upper end of the steel frame, Since the horizontal joint does not open to the fireproof panel with ribs that covers the surface of the steel column even when the frame expands and contracts, the fire resistance can be maintained with this one fireproof panel with ribs.

  And since this ribbed fireproof panel becomes a part of the partition wall, simply covering the surface exposed to the interior of the steel column with this ribbed fireproof panel, the fireproofing work and the fireproof partition on the surface exposed to the interior of the steel column Wall installation work can be performed at the same time, and costs can be reduced by reducing man-hours and materials. In addition, with respect to the surface exposed to the interior of the steel column, the interior space is not narrowed more than necessary by stacking the fireproof covering material and the fireproof wall material. can do.

It is the figure which showed the state which attached the fireproof panel with a rib between the upper slab and the lower slab in the one hierarchy of a building. It is the figure which showed an example of the fireproof panel with a rib. It is a cross-sectional view of FIG. It is a figure which shows the fireproof coating construction with respect to the conventional steel column performed using a general gypsum boat. It is a figure which shows the installation construction of the conventional fireproof partition wall performed using a general gypsum boat. It is a cross-sectional view of FIG. It is a cross-sectional view which shows the example of application of the fireproof panel with a rib in case a steel column consists of a square steel pipe. It is a cross-sectional view which shows the example of application of the fireproof panel with a rib in case the direction of H-section steel of a steel column differs. It is a cross-sectional view which shows the example which used the fireproof panel with a rib for only one surface exposed to the room | chamber interior of a steel column, and used the conventional common gypsum board for the surface exposed to the room of the other side. Cross section showing an example in which a fireproof panel with ribs is used only for the part of the partition wall that houses the steel column, and a conventional gypsum board is used for the part of the wall adjacent to the fireproof panel with ribs FIG.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a view showing a state in which a ribbed fireproof panel is attached between an upper slab and a lower slab in one level of a building. In FIG. 1, in order to show both the upper mounting structure and the lower mounting structure of the ribbed fireproof panel, the intermediate portion of the ribbed fireproof panel is omitted. FIG. 2 is a view showing a fireproof panel with ribs. FIG. 3 is a cross-sectional view of FIG.

  The building is a steel-framed fire-resistant building, and structural members such as pillars and beams are fire-resistant to prevent thermal deterioration during a fire. Is used.

  The fireproof panel 10 with a rib is comprised as a single board arrange | positioned over the whole height direction in the one hierarchy of a building. As shown in FIG. 3, the steel pillar 3 extending in the height direction through one level of the building is positioned between the two fireproof panels 10 (101a, 101b) facing each other. Can be stored.

  As shown in FIG. 2, the ribbed fireproof panel 10 is configured to include a rib 14 extending in the panel height direction on one surface of a flat panel main body 12. By having the rib 14, it is strong against bending and can be configured as a single-plate panel disposed over the entire height direction in one level of the building. The ribs 14 are provided at three positions in the width direction both ends and the center of the flat panel main body 12. The rib 14 is formed in a hollow shape that opens in the panel height direction mainly for the purpose of absorbing sound. Further, a notch groove 16 extending downward in the panel height direction is formed on the upper end surface of the rib 14.

  The fireproof panel 10 with ribs is made of gypsum as a raw material, and thus has fire resistance. In particular, those using anhydrous gypsum (hard gypsum) as a raw material are harder and more excellent in strength than general gypsum boards made from dihydrate gypsum (soft gypsum). Moreover, what was manufactured by extrusion molding is further excellent in terms of strength. Moreover, it can reinforce further by adding a fiber to this.

  The fireproof panel with ribs 10 is preferably harder than a general gypsum board and more excellent in strength. Although the specific gravity of a general gypsum board is 0.65-1.3, the specific gravity of the fireproof panel 10 with a rib is 1.6-2.0 larger than this. The bending strength is 980 N · m or more.

  In one level of the building, one surface of the steel column 3 exposed in the room is covered with a single plate of the ribbed fireproof panel 10 (101a) over the entire height direction. At this time, the fireproof panel with ribs 10 (101a) is arranged with the back surface side having the ribs 14 facing one surface exposed in the room of the steel column 3 and the surface side without the ribs 14 facing the room. Since one surface of the steel column 3 is covered, the width of the ribbed fireproof panel 10 is equal to or greater than the width of the steel column 3. Moreover, the surface exposed to the room | chamber interior of the other side of the steel column 3 is also covered with the single board of the fireproof panel 10 (101b) with a rib over the whole height direction. The two ribbed fireproof panels 10 (101a, 101b) arranged with the steel column 3 sandwiched therebetween are opposed so that the back surfaces having the ribs 14 face each other.

  This one surface of the steel column 3 is a surface exposed to the room before being covered with a single plate of the ribbed fireproof panel 10 (101a), and this one surface of the steel column 3 and the ribbed fireproof panel 10 (which covers this one surface) 101a) is not provided with a fireproof covering material such as a general gypsum boat used in the conventional fireproofing treatment. Similarly, a fireproof coating material such as a general gypsum boat is not disposed between the surface of the steel column 3 opposite to the one surface and the fireproof panel 10 (101b) with the ribs covering the surface opposite to the one surface. That is, the ribbed fireproof panel 10 (101a, 101b) directly covers one surface exposed in the room of the steel column 3 or the surface opposite to this one surface, and therefore the ribbed fireproof panel 10 (101a, 101b) covers it. The concave part of the steel column 3 made of H-shaped steel cannot be closed before. For this reason, when the position of the rib 14 on the back surface of the fireproof panel 10 with ribs (101a, 101b) overlaps with the position of the steel column 3, as shown in FIG. By projecting the ribs 14 into the recesses of the H-shaped steel avoiding the projecting flange portion 3a, the projecting of the ribbed fireproof panels 10 (101a, 101b) from the steel column 3 is reduced. The indoor space can be widened. Of course, the steel column 3 may be arranged between the convex portions of the ribs 14 so that the position of the ribs 14 does not overlap the position of the steel column 3. This also provides the same effect of reducing the overhang of the ribbed fireproof panel 10 (101a, 101b) from the steel column 3 and widening the indoor space.

  Within the first floor of the building, the remaining two surfaces of the steel column 3 not covered by the ribbed fireproof panels 10 (101a, 101b) (two surfaces in a direction perpendicular to the surfaces of the ribbed fireproof panels 10 (101a, 101b)) ) Include fire-resistant molded plates such as conventional plaster boats, calcium silicate plates, ALC panels, ribbed fire-resistant panels 10 used in conventional fire-resistant treatments, rock wool, ceramic wool, etc. A fireproof covering 18 made of a regular fireproof material is disposed. When a fire-resistant molded plate is used as the fire-resistant covering material 18, a gap may occur between the rib-fired fire-resistant panel 10 (101 a, 101 b) due to manufacturing tolerances or the like. 10 (101a, 101b) is preferably filled with a fireproof sealant, a fireproof adhesive, or an irregular fireproof material such as rock wool. On the other hand, when an irregular refractory material is used as the refractory coating material 18, such treatment is unnecessary, which is more preferable from the viewpoint of man-hour reduction and material reduction. In this way, the periphery of the steel column 3 is covered with the two sheets of the fireproof panel 10 (101a, 101b) with the ribs facing each other and the fireproof coating material 18, and the fireproofing process of the steel column 3 is completed. At the same time, the ribbed fireproof panel 10 (101a, 101b) covering the steel column 3 constitutes a part of the partition wall and becomes a part of the fireproof partition wall 20.

  As shown in FIG. 1, an upper runner 4 for supporting the upper end of a ribbed fireproof panel 10 extends on the upper slab 1. The upper runner 4 is made of an L-shaped steel material in which a horizontal plate portion 4a fixed to the upper slab 1 and a hanging plate portion 4b hanging from the horizontal plate portion 4a are connected in an L shape, and the rib of the ribbed fireproof panel 10 The upper portion of the ribbed fireproof panel 10 is supported by fitting the drooping plate portion 4b of the upper runner 4 into the notch groove 16 formed on the upper end surface of the rib 14.

  Further, a lower runner 5 for fixing the lower end of the ribbed fireproof panel 10 extends to the lower slab 2. The lower runner 5 is made of an L-shaped steel material in which a horizontal plate portion 5a fixed to the lower slab 2 and an upright plate portion 5b rising from the horizontal plate portion 5a are connected in an L shape, and the lower runner is made using screws or the like. The lower part of the ribbed fireproof panel 10 is fixed to the upright plate part 5b.

  That is, in one level of the building, the surface exposed to the interior of the steel column 3 is covered with a single plate of the ribbed fireproof panel 10 over the entire height direction, and the upper portion of the ribbed fireproof panel 10 is the upper end surface. Since it is supported by inserting the upper runner 4 of the building into the formed notch groove 16, a fireproof panel with ribs that covers the surface of the steel column 3 even when the steel column 3 expands and contracts due to heat during a fire Since the horizontal joint does not open at 10, the fire resistance can be maintained with one of the ribbed fireproof panels 10. Thereby, this fireproof panel 10 with a rib can serve as a partition wall which accommodates the steel column 3 as well as a fireproof covering material of the steel column 3.

  Then, by covering the surface exposed to the interior of the steel column 3 with the ribbed fireproof panel 10, it is possible to simultaneously perform the fireproofing construction and the installation work of the fireproof partition wall on the surface exposed to the interior of the steel column 3. Costs can be reduced by reducing man-hours and materials. Further, with respect to the surface of the steel column 3 exposed to the room, the fireproof covering material and the fireproof wall material are not laminated so that the indoor space is not narrowed more than necessary. Space can be widened.

  And when both the surfaces of the surface exposed to the interior of the steel column 3 and the surface exposed to the opposite chamber are covered by the single plate of the fireproof panel 10 with ribs over the entire height direction, the man-hour is reduced. Further, the effect of reducing the cost by reducing the material and the effect of widening the indoor space are further enhanced.

  A non-combustible sound absorbing material such as rock wool is disposed between the opposed fireproof panels 10 with ribs as needed. Between the upper slab 1 and the upper end of the ribbed refractory panel 10 and between the lower slab 2 and the lower end of the ribbed refractory panel 10, a mat 6 such as rock wool that fills the gap as needed is disposed. The mat 6 functions as a cushioning material between them during an earthquake or the like. A sealing material 7 is disposed on the front side of the mat 6 as necessary. In addition, in order to improve sound insulation performance etc., you may arrange | position further flat plates, such as another gypsum board, on the surface of the fireproof panel 10 with a rib.

  In contrast to the ribbed fireproof panel 10 according to the present invention, a general gypsum boat has a small specific gravity and does not have a rib 14 that increases the bending strength. Can not be made as a single plate that can be placed over. For this reason, in the fireproof covering construction normally performed on the steel column 3, as shown in FIG. 4, a plurality of gypsum boards 8 are arranged side by side in the height direction. For this reason, the horizontal joint 9 always appears in the fireproof covering material 18 covering the steel column 3. If it does so, when the steel column 3 expands and contracts by the heat at the time of a fire, the gypsum board 8 cannot follow the steel column 3, and the horizontal joint 9 will open. When a flame or heat enters from the horizontal joint 9, the steel column 3 disposed in the back thereof is greatly affected by the flame and heat and deteriorates. As a result, the proof stress of the steel column 3 is reduced and the building is collapsed.

  For this reason, in the conventional fireproof covering construction using a general gypsum board 8, the fire resistance cannot be satisfied by covering with a single gypsum board 8. Therefore, it is usually covered with a two-layered gypsum board 8 arranged so as not to overlap by shifting the position of the horizontal joint 9 in the height direction. In this configuration, even with the fireproofing work for the steel column 3 alone, the thickness of the refractory material projecting to the indoor side is increased, and the indoor space is narrowed. In addition, since the fireproof coating work is performed on the entire circumference of the steel column 3, the influence of increasing the thickness of the refractory material is simply doubled, further narrowing the indoor space.

  Furthermore, according to conventional common sense, the steel pillar 3 is fired and the partition wall using the refractory material is further installed and the steel pillar 3 is accommodated in the partition wall, so that the partition wall is formed. In addition, the thickness of the refractory material to be added will further reduce the indoor space. If a general gypsum board 8 is used as a fireproof material for the partition wall, as shown in FIG. 5, a plurality of gypsum boards 8 are arranged side by side in the height direction in the same manner as the fireproof covering construction of the steel column 3, From the viewpoint of preventing the horizontal joint 9 from being opened, the gypsum board 8 is also arranged in two layers in the installation of the partition wall 30 using a refractory material. If this happens, the indoor space will be further reduced. Since the indoor space is nice even if it can be several millimeters wide, the thickness of the refractory material used for the fireproof coating work of the steel column 3 and the refractory material used for the partition wall has a great influence on securing the indoor space. Moreover, in installing the partition wall 30 using the gypsum board 8, it is necessary to use the stud 32 for fixing the gypsum board 8, and the installation of the stud 32 and the fixing work of the gypsum board 8 to the stud 32 are necessary. There are inevitably more man-hours and materials.

  In addition, in the conventional fireproof covering construction using general gypsum board 8 and the installation of the partition wall, as the specification that passes the fire resistance test for 1 hour, the thickness of the fireproof cover material is 12.5 mm × 2 sheets, and the partition wall The thickness of the refractory material is 9.5 mm + 12.5 mm. On the other hand, if the fireproof panel 10 with ribs made of a single plate is used, as a specification that passes the one-hour fireproof test, gypsum is used as a raw material, and the specific gravity is 1.6 or more and the thickness is 7 mm or more.

  As described above, according to the present invention, the two constructions of the fireproof covering construction of the structural member and the installation construction of the fireproof partition wall are unnecessary, and the cost can be reduced by reducing the man-hours and the materials. Moreover, it is not necessary to have a structure in which the fireproof covering material attached to the structural member and the fireproof wall material as the partition wall are laminated on the outside of the structural member, and the indoor space can be widened.

  In the embodiment shown in FIG. 3, the steel column 3 is made of an H-shaped steel, but the steel column 3 is not limited to this, and a shape steel other than a square steel pipe or an H-shaped steel, for example, an I-shaped steel or an L-shaped steel. It may be a shape steel, a channel steel, or the like. FIG. 7 shows an example in which the steel column is made of a square steel pipe.

  As shown in FIG. 7, a steel column 34 made of a square steel pipe is housed between two opposed fireproof panels 10 (101a, 101b) with ribs. The two fireproof panels 10 with ribs (101a, 101b) are opposed to each other so that the back surfaces having the ribs 14 face each other. A fireproof covering material such as a general gypsum boat is not disposed between the ribbed fireproof panel 10 (101a, 101b) and the surface covered with the ribbed fireproof panel 10 (101a, 101b) of the steel column 34. The ribbed fireproof panel 10 (101a, 101b) directly covers the exposed surface of the steel column 34. The remaining two surfaces of the steel column 34 not covered by the ribbed fireproof panel 10 (101a, 101b) (two surfaces in a direction perpendicular to the surface of the ribbed fireproof panel 10 (101a, 101b)) are conventional fireproof. Fireproof made of fireproof molded boards such as general plaster boats, calcium silicate boards, ALC panels, ribbed fireproof panels 10 etc. used in processing, and irregular shaped fireproof materials such as rock wool and ceramic wool A covering material 18 is arranged. In this way, the periphery of the steel column 34 is covered with the two sheets of the fire-resistant panels 10 (101a, 101b) with the ribs facing each other and the fire-resistant covering material 18, and the fire-proof treatment of the steel column 34 is completed. At the same time, the ribbed fireproof panel 10 (101a, 101b) covering the steel column 34 constitutes a part of the partition wall and becomes a part of the fireproof partition wall 20.

  The convex portions of the ribbed fireproof panel 10 (101a, 101b) by the ribs 14 are arranged at both ends of the panel width direction so as not to overlap the position of the steel column 34, avoiding the portion projecting to the indoor side of the steel column 34. The steel column 34 is disposed between the protrusions formed by the ribs 14 of the ribbed fireproof panel 10 (101a, 101b). Thereby, the overhang | projection from the steel frame 34 of the fireproof panel 10 (101a, 101b) with a rib can be made small, and indoor space can be expanded.

  In the embodiment shown in FIG. 3, the steel column 3 made of H-shaped steel is arranged so that the surface of the flange portion 3a is orthogonal to the surface of the ribbed fireproof panel 10 (101a, 101b). However, as shown in FIG. 8, you may arrange | position so that the surface of the flange part 3a may be parallel with the surface of the fireproof panel 10 (101a, 101b) with a rib. In this case, the surface of the flange portion 3a of the steel column 3 made of H-shaped steel is covered with the fireproof panel 10 (101a, 101b) with ribs. The concave portion of the steel column 3 made of H-shaped steel is a fire-resistant molded plate such as a general gypsum boat, a calcium silicate plate, an ALC panel, a panel similar to the fire-resistant panel 10 with ribs, etc. A fireproof covering material 18 made of an irregular fireproof material such as rock wool or ceramic wool is disposed.

  Moreover, in embodiment shown in FIG. 3, the fireproof panel 10 (101a, 101b) with a rib is used for both one surface exposed to the room | chamber interior of the steel column 3, and the surface exposed to the room of the other side, and two sheets The ribbed fireproof panels 10 (101a, 101b) are opposed to each other so that the back surfaces having the ribs 14 face each other. As shown in FIG. 9, the ribs are formed only on one surface exposed to the interior of the steel column 3. The attached fireproof panel 10 (101a) may be used, and a conventional gypsum board 8 or the like may be used on the surface exposed to the opposite room. In this case, on the surface exposed to the opposite side of the room, first, the steel column 3 is first subjected to the fireproofing treatment with the fireproof covering material 18 and then the fireproof partition wall 20 is formed using a general gypsum board 8. May be installed. In addition, when using an amorphous fireproof material as the fireproof coating material 18 used for the fireproofing treatment of the steel column 3, the fireproof coating material 18 is one layer as shown in FIG.

  Moreover, in embodiment shown in FIG. 3, not only the covering material which covers the surface exposed to the inside of the steel column 3 but the fireproof partition wall 20 whole which accommodates the steel column 3 is comprised by the fireproof panel 10 (101a, 101b) with a rib. As shown in FIG. 10, the ribbed fireproof panel 10 (101 a, 101 b) is used only for the wall material of the fireproof partition wall 20 that accommodates the steel column 3, and the wall surface of the fireproof partition wall 20 is configured. A conventional gypsum board 8 or the like may be used as a conventional wall material in a portion adjacent to the ribbed fireproof panel 10 (101a, 101b). Since the overhang of the steel column 3 is a cause of narrowing the indoor space, the thickness of the wall of the fireproof partition wall 20 that accommodates the steel column 3 is kept thin by using the ribbed fireproof panel 10 (101a, 101b). If this is the case, the interior space can be widened while maintaining the fireproof performance, even if a general gypsum board 8 or the like is used in the other portions.

  In addition, in the said embodiment, although the rib 14 is shown as a hollow thing, it is not limited to this, A solid thing may be sufficient.

3 Steel Column 10 Fireproof Panel with Rib 14 Rib 16 Notch Groove 20 Fireproof Partition Wall

Claims (6)

  In one level of the building, at least one of the exposed surfaces of the steel column is covered with a single plate of ribbed fireproof panels having ribs extending in the panel height direction throughout the height direction, and the ribbed fireproof A steel column fireproof structure characterized in that the upper part of the panel is supported by inserting the upper runner of the building into a notch groove formed in the upper end surface thereof.   The both surface of the surface exposed to the room | chamber interior of the said steel column and the surface exposed to the other room | chamber interior are each covered with the single plate of the said fireproof panel with a rib over the whole height direction. 1. A fireproof structure of a steel column according to 1.   The fireproof structure for a steel column according to claim 1 or 2, wherein a convex portion by the rib of the ribbed fireproof panel is arranged at a position avoiding a portion projecting to the indoor side of the steel column.   The steel column fireproof structure according to claim 3, wherein the steel column is disposed between a convex portion and a convex portion of a rib of the ribbed fireproof panel.   The said steel column is H-section steel, The convex part by the rib of the said fireproof panel with a rib is arrange | positioned in the recessed part of this H-section steel, The fireproof structure of the steel column of Claim 3 characterized by the above-mentioned.   In one level of the building, at least one of the exposed surfaces of the steel column is covered with a single plate of ribbed fireproof panels having ribs extending in the panel height direction over the entire height direction of the steel pillars. A fireproof partition wall structure characterized in that the panel becomes a part of the partition wall, and the upper part of the ribbed fireproof panel is supported by inserting the upper runner of the building into a notch groove formed in the upper end surface thereof .

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