JP5748975B2 - Fireproof structure of steel columns - Google Patents

Description

  The present invention relates to a fireproof structure for a steel column.

  There has been proposed a steel column fireproof structure that improves the fire resistance of the steel column by surrounding the steel column with a board member such as a reinforced gypsum board or a mortar board to form a peripheral wall. For example, Patent Document 1 introduces a steel fireproof covering structure in which the outer surface of a steel column is covered with a reinforced fireproof board.

  In such a fireproof structure, when an equipment space is provided between the peripheral wall and the steel column, and an opening connecting the equipment space and the room space is provided in a part of the peripheral wall, the fire resistance of the steel column is reduced. There is a concern that

JP 2002-180569 A

  This invention considers the fact which concerns, and makes it a subject to provide the fireproof structure of the steel column which can prevent or reduce the fall of the fire resistance of the steel column by providing an opening part in the surrounding wall surrounding a steel column.

In the first aspect of the present invention, a first shielding portion having an opening formed by a plurality of board members surrounding the steel column constituting the structure with a space from the steel column, and projecting toward the steel column side. And a second shielding part that covers the opening and forms an equipment space.

In the invention of the first aspect , the first shielding portion is configured by a plurality of board members surrounding the steel column with a space from the steel column. Moreover, an installation space is formed by the second shielding part that is provided so as to protrude toward the steel column and covers the opening of the first shielding part.

  Therefore, against the flame and heat at the time of fire entering the equipment space from the opening, the steel column is shielded by the second shielding part, and the fire resistance of the steel column is lowered by providing the opening in the first shielding part. Can be prevented or reduced.

According to a second aspect of the present invention, in the fireproof structure of a steel column according to the first aspect, the second shielding portion is fixed to a support member whose upper and lower ends are supported by the structure and the board member is fixed.

In the second aspect of the invention, the second shielding part can be reliably installed so as to cover the opening by fixing the second shielding part to the support member. Further, the support member to which the board member is fixed can also be used as the member to which the second shielding part is fixed.

According to a third aspect of the present invention, in the fireproof structure of a steel column according to the first or second aspect, the second shielding portion is formed by a plurality of groove-shaped members stacked in the vertical direction, and a joint between the groove-shaped members. Is closed with a sheet member.

In the invention of the third aspect , the labor for installing the second shielding part can be reduced by forming the second shielding part with a plurality of groove-shaped members.

  Since this invention set it as the said structure, the fall of the fire resistance of the steel column by providing an opening part in the surrounding wall surrounding a steel column can be prevented or reduced.

It is a perspective view which shows the fireproof structure of the steel column which concerns on the 1st Embodiment of this invention. It is AA sectional drawing of FIG. It is a front view which shows the fireproof structure of the steel column which concerns on the 1st Embodiment of this invention. It is a front view which shows the fireproof structure of the steel column which concerns on the 2nd Embodiment of this invention. It is BB sectional drawing of FIG. It is sectional drawing which shows the modification of the fireproof structure of the steel column which concerns on the 2nd Embodiment of this invention. It is explanatory drawing which shows the formation method of the 2nd shielding part and channel member which concern on embodiment of this invention. It is explanatory drawing which shows the formation method of the 2nd shielding part and channel member which concern on embodiment of this invention. It is sectional drawing which shows the modification of the fireproof structure of the steel column which concerns on embodiment of this invention. It is a front view which shows the modification of the fireproof structure of the steel column which concerns on embodiment of this invention. It is CC sectional drawing of FIG.

  Embodiments of the present invention will be described with reference to the drawings. First, a first embodiment of the present invention will be described.

  As shown in FIG. 2, which is a perspective view of FIG. 1 and a cross-sectional view taken along line AA in FIG. 1, the steel column fireproof structure 10 includes a first shielding part 12 and a second shielding part 14. . The first shielding part 12 is constituted by a plurality of board members 20 surrounding the steel column 18 constituting the structure 16 and covers the steel column 18 in a fireproof manner. The steel column 18 is a steel pipe having a substantially square cross section.

  The board member 20 is composed of a lower board 22 and an upper board 24 that also serves as a finishing material. The lower board 22 is disposed on the inner side (the steel column 18 side), and the upper board 24 is disposed on the outer side (the room space 26 side) so as to overlap the outer surface of the lower board 22. As shown in FIG. 2, the underboard 22 is disposed with a space from the steel column 18. As a result, a space is formed between the outer surface of the steel column 18 and the inner surface of the underboard 22 so as to surround the steel column 18.

  The lower board 22 is formed of a reinforced gypsum board, and the upper board 24 is formed of a gypsum board. Gypsum board is a fire-resistant board made of plaster-based material and wrapped in special paper, and reinforced gypsum board is a fire-resistant board that is enhanced by adding glass fiber etc. to the gypsum. It is. Note that gypsum usually contains a large amount of crystal water, and when exposed to flame or heat, this crystal water is released into the air as vapor. And heat insulation is exhibited by absorbing heat by evaporation of crystal water.

  The board member 20 is fixed to a stud 28 as a supporting member arranged substantially vertically. The stud 28 is made of C-shaped steel made of light iron, and is moved up and down to floor slabs 32 and 34 arranged on the upper and lower sides constituting the structure 16 via a runner 30 made of light iron having a groove-shaped cross section. Both ends are fixed and supported by floor slabs 32 and 34.

  As shown in FIG. 2, the lower board 22 is attached to the stud 28 by a drilling tapping screw 36, and the upper board 24 is attached to the lower board 22 by an adhesive and a stable (not shown). The drilling tapping screw 36 may be passed through the upper board 24 and the lower board 22, and both the upper board 24 and the lower board 22 may be attached to the stud 28.

  As shown in the front view of FIG. 3, a rectangular opening 38 is formed in a part of the first shielding portion 12 so as to extend vertically from the lower surface of the floor slab 32 to the upper surface of the floor slab 34. Further, the opening 38 is closed by a lid member 40 that is formed in a plate shape and also serves as a finishing material. For convenience of explanation, the lid member 40 is omitted in FIG. A switch panel 42 is attached to the lid member 40. In addition to the switch panel 42, appliances and equipment such as an outlet box, a speaker, and a lighting device may be attached to the lid member 40.

  As shown in FIGS. 1 and 2, the second shielding portion 14 is a long member having a U-shaped cross section formed integrally in a groove shape by the same material as that forming the reinforced gypsum board. is there. The second shielding part 14 is provided so as to protrude toward the steel column 18 and covers the opening 38, and an equipment space S is formed between the opening surface of the opening 38 and the outer surface of the steel column 18. The second shielding portion 14 is disposed from the lower surface of the floor slab 32 to the upper surface of the floor slab 34, and the side wall portions 44 </ b> A and 44 </ b> B are fixed to the stud 28 by a drilling tapping screw 36.

  Here, the facility space means a space where electric cables (distribution cables, power cables, network cables, signal cables, etc.), distribution boards, switch boxes, outlet boxes, water pipes, and the like are arranged.

  In FIG. 3, the power distribution cable arranged in the equipment space S is connected to the switch of the switch panel 42. The electric cables and water pipes arranged in the facility space are laterally drawn in the underfloor space or the ceiling back space to reach a necessary place.

  Next, the operation and effect of the first embodiment of the present invention will be described.

  In the steel column fireproof structure 10 of the first embodiment, as shown in FIG. 2, the lid member 40 cannot keep its shape due to the flame or heat generated in the room space 26 due to a fire (for example, the lid member 40 is burned). When the flame or heat enters the equipment space S from the opening 38, the steel column 18 is shielded from the flame or heat by the second shield 14. . Thereby, it can prevent or reduce that the fire resistance of the steel column 18 falls by providing the opening part 38 in the 1st shielding part 12 surrounding the steel column 18. As shown in FIG.

  In addition, by fixing the second shielding part 14 to the stud 28, the second shielding part 14 can be reliably installed so as to cover the opening 38.

  Further, the stud 28 to which the board member 20 is fixed can also be used as a member to which the second shielding part 14 is fixed. That is, a member to which the second shielding part 14 is fixed may not be provided separately.

  Moreover, by closing the opening 38 with the lid member 40, it is possible to prevent the appearance from being damaged by exposing the equipment space S to the outside (the room space 26).

  In addition, a member made of a material that can be easily processed for the purpose of facilitating formation of an opening in the lid member 40 for attaching a switch panel or the like to the lid member 40 or passing an electric cable or water pipe or the like. (For example, a wooden plate material) can be used as the lid member 40. In addition, a light member (for example, a resin plate material) can be used as the lid member 40 for the purpose of easy removal and opening / closing of the lid member 40 when the equipment space S is maintained.

  That is, in the steel column fireproof structure 10, the second shield 14 shields the steel column 18 from flame and heat, so the lid member 40 does not necessarily have to be a member having fire resistance. If the lid member 40 is made of a material that can easily form the opening, the opening can be easily formed at a free position of the lid member 40. Further, if the lid member 40 is made of a light material, the lid member 40 can be easily removed and opened / closed.

  Moreover, since the 2nd shielding part 14 is arrange | positioned from the lower surface of the floor slab 32 to the upper surface of the floor slab 34, the flame and heat which entered the installation space S from the opening part 38 move up and down, and an upper floor Even when it reaches the lower surface of the floor slab 32 or the upper surface of the floor slab 34 of the lower floor, the steel column 18 can be shielded against these flames and heat by the second shielding part 14.

  Further, as shown in FIG. 1, the second shielding portion 14 plays a role of a rod-shaped steadying member 46 that stops the swing of the stud 28, so that the steadying member 46 in a portion where the second shielding portion 14 is disposed. Is no longer necessary. Further, a hole formed in the stud 28 for installing the steadying member 46 can be used for fixing the second shielding portion 14 to the stud 28.

  Next, a second embodiment of the present invention will be described. In the description of the second embodiment, the same components as those in the first embodiment are denoted by the same reference numerals and are appropriately omitted.

  In the steel column fireproof structure 48 of the second embodiment, as shown in the front view of FIG. 4, the second shielding portion 14 is formed by a plurality of channel members stacked in the vertical direction. Moreover, each groove-shaped member is integrally formed in the groove shape by the same material as what forms a reinforced gypsum board.

  Here, the groove-shaped members 50A and 50B arranged vertically near the approximate center in the vertical direction will be described. For convenience of explanation, the lid member 40 is omitted in FIG. 4, but the opening 38 is closed by the lid member 40 as in the first embodiment.

  A horizontal joint between the lower end of the groove member 50A and the upper end of the groove member 50B is provided on the lower surface of the groove member 50A and the outer surface (surface on the steel column 18 side) of the upper end of the groove member 50B. A band-shaped fixing member 54 is provided substantially horizontally in a front view so as to close 52. As shown in FIG. 5 which is a BB cross-sectional view of FIG. 4, the fixing member 54 is a member obtained by bending a thin steel plate such as light iron into a substantially U shape in a plan view. The lower end of the channel member 50A, and the lower end of the channel member 50B so that there is no gap between the outer surface of the upper end of the channel member 50B and the inner surface of the fixing member 54 (the surface on the room space 26 side), and A fixing member 54 is disposed along the outer surface of the upper end portion of the groove-shaped member 50B. Further, the end portions 54A and 54B of the fixing member 54 are fixed to the stud 28 by a bolt 56 so that the inner surface of the fixing member 54 is pressed against the outer surface of the lower end portion of the groove member 50A and the upper end portion of the groove member 50B. Has been.

  As shown in FIGS. 4 and 5, the lower end portion of the groove member 50 </ b> A and the upper end portion of the groove member 50 </ b> B are fixed to the fixing member 54 by a drilling tapping screw 36. Thereby, the opening of the horizontal joint 52 by being exposed to a flame or heat and contracting the groove-shaped members 50A and 50B can be reduced.

  Next, the operation and effect of the second embodiment of the present invention will be described.

  In the steel column fireproof structure 48 according to the second embodiment, as shown in FIG. 4, the groove member can be standardized by forming the second shielding portion 14 by a plurality of groove members. Moreover, since the groove-shaped member can be made into a small and light-weight member, it becomes easy to carry out and mount the groove-shaped member. Thereby, the installation effort of the 2nd shielding part 14 can be reduced.

  The second embodiment of the present invention has been described above.

  In the second embodiment of the present invention, the example in which the lower end portion of the groove-shaped member 50A and the upper end portion of the groove-shaped member 50B are fixed to the fixing member 54 is shown, but as shown in the plan sectional view of FIG. Further, a belt-like sheet member 58 is provided between the outer surface of the lower end portion of the groove-shaped member 50A and the upper end portion of the groove-shaped member 50B and the inner surface of the fixing member 54. The horizontal joint 52 may be closed. Thus, when the groove members 50A and 50B contract due to exposure to flame or heat and the horizontal joint 52 opens, the sheet member 58 closes and shields the horizontal joint 52 against the flame and heat, and the steel column 18 It can prevent or reduce that the fire resistance of this falls.

  In the configuration of FIG. 6, the lower end portion of the groove member 50 </ b> A and the upper end portion of the groove member 50 </ b> B may be fixed to the fixing member 54 by the drilling tapping screw 36. The sheet member 58 only needs to be able to block and shield the horizontal joint 52 against flame and heat when the horizontal joint 52 is opened. For example, a thin steel plate or a foam sheet (thermal expansion sheet) that foams at high temperatures may be used. Further, the width in the vertical direction of the sheet member 58 is set to be equal to or larger than the maximum opening of the horizontal joint 52 (for example, 50 mm or more).

  Further, for example, the lower end portion of the groove member 50A and the upper end portion of the groove member 50B are tenoned, or the lower end portion of the groove member 50A and the upper end portion of the groove member 50B are wrapped, You may make it prevent or reduce the fire resistance fall by the opening of the horizontal joint 52. FIG.

  The first and second embodiments of the present invention have been described above.

  In the first and second embodiments, the lower board 22 is formed of a reinforced gypsum board, the upper board 24 is formed of a gypsum board, and the second shielding part 14 is the same as that of forming a reinforced gypsum board. Although the example formed with the material was shown, it is not limited to this, The upper board 24, the lower board 22, and the 2nd shielding part 14 can hold the shape when heated for a predetermined time by fire etc. (for example, Any member that does not burn, does not break, or does not collapse. For example, the upper board 24, the lower board 22 and the second shielding part 14 may be formed of fiber mixed calcium silicate, mortar, ceramic fiber, lightweight cellular concrete or the like, and the upper board 24 may be used as a decorative board. Good. Further, the upper board 24 may be a reinforced gypsum board to further improve the fire resistance.

  Further, when the board member 20 is constituted by a plurality of boards (the underboard board 22 and the upboard board 24) as in the first and second embodiments, the gypsum board, the fiber mixed calcium silicate board, and the mortar board. The board member 20 may be configured by combining a fireproof board such as the above and a board other than the fireproof board.

  In the first and second embodiments, an example in which the board member 20 is configured by two boards (the lower board 22 and the upper board 24) has been described. However, the board member 20 is constituted by three or more boards or one board. The board member 20 may be configured.

  In the first and second embodiments, the support member is the stud 28 made of C-shaped steel made of light iron. However, the support member includes the board member 20 and the second shielding portion 14. As long as it can be securely fixed and supported, a shaft-shaped member having another structural cross-sectional shape may be used, or it may be formed of other materials. It is preferable that it is a member excellent in fire resistance.

  In the first embodiment, the second shielding portion 14 is integrally formed. In the second embodiment, the groove-shaped member is integrally formed. However, the second shielding portion 14 and the groove are formed. The shape member may be formed by cutting into a groove shape having a U-shaped cross section, or may be formed by combining board members such as a gypsum board and a reinforced gypsum board.

  For example, as shown in the cross-sectional plan view of FIG. 7, the calcium silicate plates 80 are arranged in a U shape in plan view, and the ends of the calcium silicate plates 80 are joined with a drilling tapping screw 36 or a nail or the like. And you may form the 2nd shielding part 14 and a channel-shaped member.

  Further, for example, as shown in the plane cross-sectional view of FIG. 8, the gypsum board 82 is arranged in a U shape in plan view, the outer periphery is covered with a thin steel plate 84, and the gypsum board is covered with the drilling tapping screw 36, nails or the like 82 and the thin steel plate 84 may be integrated to form the second shielding part 14 and the groove-shaped member.

  When the board member is combined to form the second shielding part 14 or the groove-shaped member, the gap generated in the joint part between the board members is reduced by contracting the board member exposed to flame or heat, or It is preferable that the structure be closed.

  In addition, the second shielding portion 14 shown in the first and second embodiments contracts by being exposed to flames or heat, so that the front side of the side wall portions 44A and 44B of the second shielding portion 14 (the room space 26 side). ) When there is a concern that a gap is generated between the end surface and the inner surface of the underlaying board 22 (the surface on the steel column 18 side), the side portions 44A and 44B of the second shielding portion 14 are as far forward as possible (the room). A drilling tapping screw 36 may be provided on the space 26 side and fixed to the stud 28, or the number of the drilling tapping screws 36 for fixing the side wall portions 44A and 44B of the second shielding portion 14 to the stud 28 may be increased.

  Further, the gap is formed so as to cover the gap formed between the front side (room space 26 side) end face of the side wall parts 44A and 44B of the second shielding part 14 and the inner surface of the underboard 22 (steel column 18 side surface). You may provide a protective sheet (For example, a thin steel plate, the foam sheet which foams at the time of high temperature, etc.). Further, the side wall portions 44 </ b> A and 44 </ b> B of the second shielding portion 14 and the underboard 22 may be mortise joined. 9, the front side (room space 26 side) of the side walls 44A and 44B of the second shielding part 14 is L-shaped, and the drilling tapping screw 36 is connected to the underboard 22 and the second board 22 as shown in FIG. The end portions 60 </ b> A and 60 </ b> B of the two shielding portions 14 may be penetrated, and both the underboard 22 and the end portions 60 </ b> A and 60 </ b> B of the second shielding portion 14 may be attached to the stud 28.

  In the first and second embodiments, the example in which the second shielding portion 14 is disposed on the inner side of the underlay board 14 (on the steel column 18 side) is shown. However, the side wall of the second shielding portion 14 is seen in plan view. The second shielding part 14 is arranged so that the front end (room space 26 side) end surface of the portions 44A and 44B is flush with the outer surface (surface on the room space 26 side) of the underboard 22 or the upper board 24. Also good.

  In the first and second embodiments, the opening 38 is formed from the lower surface of the floor slab 32 to the upper surface of the floor slab 34. However, the opening 38 covers the opening 38. As long as the 2 shielding part 14 can be provided, it may be provided in any position of the 1st shielding part 12, and may be made into any magnitude | size.

  For example, like the steel column fireproof structure 62 shown in the front view of FIG. 10, the opening 38 may be formed in a part in the vertical direction. In this case, as shown in FIG. 11 which is a CC cross-sectional view of FIG. 10, the upper board 64 and the lower board 66 are integrated with the second shielding part 14 substantially horizontally above and below the second shielding part 14. Provide to be. That is, the second shielding part 14, the upper board 64 and the lower board 66 constitute a box-shaped shielding part opened to the opening 38. What is necessary is just to form the upper board 64 and the lower board 66 with the material similar to what forms the 2nd shielding part 14. FIG.

  In the steel column fireproof structure 62, for example, if the vicinity of the insertion hole of the through hole 70 formed in the upper board 64 through which the power distribution cable 68 passes is covered with a fireproof material 74 such as a foam material, the through hole 70 It is possible to prevent a flame or heat from entering the steel column 18 side.

  Further, for example, if the through-hole 72 formed in the lower board 66 through which the power distribution cable 68 passes and the pipe material 76 having fire resistance are connected to each other and the pipe material 76 is connected to the lower board 66, it enters from the through-hole 72. It is possible to prevent the flame and heat from reaching the steel column 18.

  Further, in the first and second embodiments, an example in which the opening portion 38 is blocked by the lid member 40 has been described. However, the lid member 40 may be any member that closes the opening portion 38, for example, a door, It is good also as a wire mesh, a blind, etc. Further, the opening 38 may not be blocked.

  Generally, in a building using a curtain wall, the outer periphery of the building is often constituted by a pillar and a thin non-bearing wall, and therefore, in the outer periphery of the building, an installation space can be provided only for the pillar. Accordingly, the fire resistance structure 10 of the steel column according to the first embodiment and the fire resistance structure 48 of the steel column according to the second embodiment, in which the fire resistance of the pillar does not deteriorate even if an installation space is provided in the pillar, use a curtain wall. It is especially effective in the building where it was.

  As mentioned above, although 1st and 2nd embodiment of this invention was described, this invention is not limited to such embodiment at all, You may use combining 1st and 2nd embodiment, Needless to say, the present invention can be implemented in various modes without departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 10, 48, 62 Fireproof structure of steel column 12 1st shielding part 14 2nd shielding part 16 Structure 18 Steel column 20 Board member 28 Stud (supporting member)
32, 34 Floor slab (structure)
38 Opening 50A, 50B Channel member 58 Sheet member S Equipment space

Claims (2)

A first shielding portion having an opening portion constituted by a plurality of board members surrounding the steel column constituting the structure with a space from the steel column;
A groove-shaped second member that is provided so as to protrude from the first shielding portion toward the steel column side, covers the opening , and has a space between the steel column and forms a facility space. A shielding part;
A support member that is provided in a non-contact manner with the steel column, is supported by standing on the floor slabs that constitute the structure, and is arranged up and down, and on which the board member is fixed,
I have a,
The said 2nd shielding part is a fireproof structure of the steel column arrange | positioned between the two said supporting members, and being each fixed to these two said supporting members . A first shielding portion having an opening portion constituted by a plurality of board members surrounding the steel column constituting the structure with a space from the steel column;
A second shielding part which is provided so as to protrude toward the steel column side, covers the opening, and forms a facility space;
Have
The second shielding part is formed of a plurality of groove-shaped members stacked in the vertical direction, and the joint between the groove-shaped members is a steel column fireproof structure closed with a sheet member.

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