JP2015059347A - Column-beam structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress transfer of heat to a wooden beam from a steel column.SOLUTION: A column-beam structure that includes a steel column, a wooden beam, a connection member that connects the steel column and the wooden beam together, and a heat absorption part for covering the connection member.

Description

  The present invention relates to a column beam structure including a steel column and a wooden beam.

  A column beam structure composed of steel columns and wooden beams has been proposed. For example, Patent Document 1 discloses a column beam structure in which a wooden beam is joined to a steel column with a plurality of lag screw bolts.

  However, if a steel pillar is heated in the event of a fire and this heat is transmitted to the wooden beam, and the wooden beam exceeds the ignition temperature, the wooden beam will burn and it will not be possible to maintain the soundness of the structural member. . In general, the ignition temperature of a wooden beam is lower than that of a steel column (the temperature at which the steel column can maintain its soundness as a structural member with almost no decrease in yield strength). Even so, there is a concern that the wooden beams will burn due to the heat transferred from the steel columns.

JP 2010-236239 A

  This invention considers the fact which concerns, and makes it a subject to suppress the heat transfer from a steel pillar to a wooden beam.

  The invention of the first aspect is a column beam structure having a steel column, a wooden beam, a connection member that connects the steel column and the wooden beam, and a heat absorption part that covers the connection member.

  In the first aspect of the invention, in the event of a fire, heat transferred from the heated steel column to the wooden beam can be absorbed by the heat absorbing portion, and heat transfer from the steel column to the wooden beam can be suppressed. Thereby, the temperature of a wooden beam can be suppressed below the ignition temperature. Therefore, the fire resistance of the wooden beam is ensured during a fire, and the soundness of the wooden beam as a structural member can be maintained.

  According to a second aspect of the present invention, in the column beam structure according to the first aspect, the connection member is provided so as to protrude from the steel column, and the wooden beam is joined to the steel column with a gap therebetween. The heat absorbing portion is formed of a cement-based solidified material that fills the gap and covers the plate-like member.

  In the second aspect of the invention, by changing the size of the gap between the steel column and the wooden beam (changing the area of the plate member covered by the heat absorbing portion), the heat absorbing performance by the heat absorbing portion is changed. Can do.

  According to a third aspect of the present invention, in the column beam structure according to the first aspect, the wooden beam is disposed between the steel columns disposed adjacent to each other, and the connection member is disposed adjacent to the steel. A support member erected on the pillar, and a plate member that is suspended from the support member and to which the wooden beam is joined; and the heat absorbing portion is a concrete floor slab that covers the support member.

  In the invention of the third aspect, in the column beam structure in which the wooden beam is disposed between the adjacent steel columns, heat transfer from the steel column to the wooden beam can be suppressed.

  Since this invention set it as the said structure, the heat transfer from a steel pillar to a wooden beam can be suppressed.

It is a side view showing the column beam structure concerning a 1st embodiment of the present invention. It is AA sectional drawing of FIG. It is BB sectional drawing of FIG. It is front sectional drawing which shows the column beam structure which concerns on 2nd Embodiment of this invention. It is CC sectional drawing of FIG. It is front sectional drawing which shows the column beam structure which concerns on 3rd Embodiment of this invention. It is DD sectional drawing of FIG. It is front sectional drawing which shows the column beam structure which concerns on 4th Embodiment of this invention. It is EE sectional drawing of FIG.

  A first embodiment of the present invention will be described with reference to the drawings. First, the column beam structure according to the first embodiment of the present invention will be described.

  As shown in FIG. 1 which is a side view of FIG. 1, FIG. 2 which is an AA cross-sectional view of FIG. 1, and FIG. 3 which is a BB cross-sectional view of FIG. The column 12, the wooden beam 14, the connecting member 16, and the heat absorbing portion 18 are configured.

  As shown in FIG. 1, the column 12 is configured by a square tubular steel pipe. A beam 22 made of H-section steel is placed and joined to the upper end of the column 12 via a pedestal plate 20.

  As shown in FIG. 3, the beam 14 surrounds a beam core 24 as a wooden core material that supports a load, a flame stop layer 26 that surrounds the lower surface and side surfaces of the beam core 24, and a lower surface and side surfaces of the flame stop layer 26. And a wood burning allowance layer 28.

  As shown in FIG. 1, a floor slab 48 made of reinforced concrete is provided on the beams 14 and 22. That is, the upper surface of the beam 14 is covered with the floor slab 48, thereby ensuring fire resistance. The floor slab 48 may be formed of unreinforced concrete.

  As shown in FIG. 3, slits 30 are formed in the beam core 24 of the beam 14 substantially vertically from the upper surface of the beam core 24 to the vicinity of the lower surface. The slit 30 is formed substantially at the center of the beam 14 (beam core material 24) with respect to the beam width direction 32 of the beam 14.

  As shown in FIG. 1, the connection member 16 is a steel plate-like member provided as a gusset plate so as to protrude from the column 12. 2, a plurality of headed studs 34 are provided on the column 12 side of the connection member 16, and a plurality of through holes are provided on the tip end side of the connection member 16, as shown in FIG. A hole 36 is formed.

  As shown in FIG. 3, with the connecting member 16 inserted into the slit 30, the drift pin 40 is inserted into the connecting hole 38 formed substantially horizontally in the beam core member 24 and the through hole 36 formed in the connecting member 16. By inserting and connecting the connecting member 16 to the beam core member 24, the beam 14 is joined to the column 12. That is, the column 12 and the beam 14 are connected by the connecting member 16.

  The drift pin 40 is inserted through an insertion hole 42 that is formed in the burning allowance layer 28 and the flame stop layer 26 and communicates with the coupling hole 38. Then, after inserting the drift pin 40 into the connecting hole 38 and the through hole 36, the insertion hole 42 is closed with a closing material or a closing member. The insertion hole 42 formed in the burnup layer 28 is closed by the material forming the burnup layer 28, and the insertion hole 42 formed in the burnout layer 26 is closed by the material forming the burnout layer 26. Is preferred.

As shown in FIGS. 1 and 2, the beam 14 is joined to the column 12 with a gap S ₁ (not shown) having a distance L ₁ between the beam 14 and the column 12. The heat absorbing portion 18 is formed in the gap S ₁ by concrete as a cement-based solidifying material that fills the gap S ₁ and covers the connection member 16. That is, the connection member 16 of the portion exposed to the gap S ₁ before the concrete is cast into the gap S ₁ is covered with a heat absorbing unit 18.

  The heat absorption part 18 covers the end surfaces of the beam core member 24 and the flame stop layer 26, and is formed so that the outer peripheral surface of the heat absorption part 18 is flush with the outer peripheral surface of the flame stop layer 26. A wooden board 44 as a finishing material is attached to the lower surface and the side surface of the heat absorbing portion 18. The outer peripheral surface of the wood board 44 is flush with the outer peripheral surface of the burning allowance layer 28.

  In the concrete forming the heat absorbing portion 18, a wire net 46 is embedded in the vicinity of the surface of the heat absorbing portion 18 together with the connecting member 16 and the headed stud 34. That is, the heat absorption part 18 has a reinforced concrete structure. Although the metal mesh 46 is provided in order to obtain the crack suppression effect of the concrete forming the heat absorbing portion 18, a method other than the metal mesh 46 may be used. For example, reinforcing bars may be arranged only in a lattice shape or in the vertical direction, or nothing may be provided unless concrete cracks occur.

  The concrete placement of the heat absorbing portion 18 is performed simultaneously with the concrete placement of the floor slab 48. In addition, the joint clearance (not shown) formed between the end face of the beam 14 and the heat absorbing portion 18 after the concrete placement of the heat absorbing portion 18 is closed by a closing member 50 having heat insulation, so that the fireproofing treatment is performed. It has been subjected. The closing member 50 can be, for example, a member in which rock wool is formed in a felt shape. Further, for example, mortar may be filled in the joint gaps. Furthermore, for example, the joint gap may be filled with a flexible material having heat insulation properties. In this way, even when the beam 14 contracts in the beam length direction 52 due to drying or the like, the state in which the joint gap is closed can be maintained.

  The pillar 12 is fire-resistant coated with spray rock wool (not shown). This fire-resistant coating is higher than the fire resistance temperature of the pillar 12 at the time of a fire (the limit temperature at which the steel pipe constituting the pillar 12 can maintain the soundness as a structural member with almost no decrease in yield strength, for example, 325 ° C.) It is a general fireproof coating applied to the pillar 12 so as not to reach a temperature.

  The fireproof coating applied to the pillars 12 may be other than sprayed rock wool as long as the pillar 12 can be coated so as not to reach a temperature higher than the fireproof temperature in the event of a fire. For example, a wet fireproof paint, a dry rock wool sheet, a high heat resistant rock wool sheet, a thermal expansion sheet, a calcium silicate plate, or a gypsum board may be used as the fireproof coating.

As an example of a construction method for constructing the column beam structure 10, first, as shown in FIG. 1, the connection member 16 is inserted into the slit 30 to move the beam 14, and the length L between the column 12 and the column 12 is set. _The beam 14 is arranged at a position where the column 12 is joined with a gap S ₁ (not shown) ₁ .

  Next, as shown in FIG. 3, the beam 14 is joined to the column 12 by connecting the connecting member 16 to the beam core member 24 by the drift pin 40.

  Next, as shown in FIGS. 1 and 2, concrete is placed on the beam 14 to form a floor slab 48. Moreover, the heat absorption part 18 is also formed simultaneously by the concrete placement at this time. That is, the floor slab 48 and the heat absorption part 18 are formed by one concrete placement.

  Next, a fireproofing process is performed by closing the joint gap formed between the end face of the beam 14 and the heat absorbing portion 18 with the closing member 50.

  In addition, the beam core material 24 and the burning allowance layer 28 should just be formed with the timber. For example, the beam core material 24 and the burning allowance layer 28 may be formed of wood (hereinafter referred to as “general wood”) used for general wooden construction such as Yonematsu, Karamatsu, firewood, cedar, and Asunaro. The general wood may be processed into a single material such as a plate or a prism, and a plurality of such single materials may be assembled and bonded together with an adhesive to be integrated.

  Moreover, the flame stop layer 26 should just be a layer which can suppress a flame and the entrance of a heat | fever and can exhibit a flame stop effect. For example, the flame stop layer 26 may be a layer having flame retardancy or a layer capable of absorbing heat.

  Examples of the flame retardant layer include a flame retardant chemical injection layer obtained by injecting a flame retardant chemical into wood and making it incombustible. The layer capable of absorbing heat may be formed of a material having a larger heat capacity than general wood, a material having higher thermal insulation than general wood, or a material having higher thermal inertia than general wood. (In FIG. 3, mortar bars 54 formed of mortar, which is a material having a larger heat capacity than general wood, and plate members 56 formed of general wood are alternately arranged. Thus, an example in which the flame-out layer 26 is formed is shown).

  Examples of materials having a larger heat capacity than general wood include inorganic materials such as mortar, stone, glass, fiber reinforced cement, and plaster, and various metal materials. Examples of the material having higher heat insulation than general wood include calcium silicate board, rock wool, and glass wool. Examples of the material having higher thermal inertia than general wood include wood such as Selangan Batu, Jara, and Bongoshi.

  Furthermore, the heat absorption part 18 should just have the heat capacity which can absorb the heat transmitted from the pillar 12 to the beam 14 (beam core material 24) from the connection member 16. For example, cast-in-place or precast cement-based solidified material (reinforced concrete, fiber reinforced concrete, mortar, lightweight cellular concrete, etc.), hydrated aluminum hydroxide or water-absorbing polymer (for example, sodium polyacrylate), gypsum, stone Glass can be used as the heat absorption part 18. Further, for example, the heat absorbing portion 18 may be formed by grouting mortar.

  Moreover, although the example which affixed the wooden board 44 as a finishing material on the lower surface and side surface of the heat absorption part 18 was shown, for example, a base is provided in the lower surface and side surface of the heat absorption part 18, and a finishing material is attached to this base You may do it. In this way, even if it is a thin finishing material, the surface of this finishing material and the outer peripheral surface of the burning allowance layer 28 can be made flush. Further, for example, the heat absorbing portion is made of concrete so as to cover the end faces of the beam core member 24, the flame stop layer 26, and the burning allowance layer 28, and the outer peripheral surface of the heat absorbing portion 18 being flush with the outer peripheral surface of the burning allowance layer 28. 18 may be formed, and the outer peripheral surface of the heat absorption part 18 may be concrete-finished.

  Furthermore, although the example of the construction method which forms the heat absorption part 18 after joining the beam 14 to the pillar 12 was shown, you may join the beam 14 to the pillar 12 after forming the heat absorption part 18. FIG.

  Next, the operation and effect of the column beam structure according to the first embodiment of the present invention will be described.

  In the column beam structure 10 of the first embodiment, as shown in FIG. 3, when a fire occurs in the beam 14, a flame ignites the burning allowance layer 28 and the burning allowance layer 28 burns. The burned combustion allowance layer 28 is carbonized. As a result, the burning allowance layer 28 that carbonizes heat transfer from the outside of the beam 14 to the beam core material 24 is suppressed and the flame stop layer 26 absorbs heat, so that the beam core material 24 at the time of fire or at the time of fire and after the end of the fire The temperature rise can be suppressed, and the beam core material 24 can be suppressed to less than the ignition temperature (for example, 260 ° C.), and the beam core material 24 can be stopped without burning. Therefore, the load can be supported by the beam core material 24 during a predetermined time at the time of fire, or at the time of fire and after the end of fire.

  Further, in the column beam structure 10 of the first embodiment, in the event of a fire, the heat transferred from the heated steel column 12 to the wooden beam 14 is absorbed by the heat absorbing portion 18 from the connection member 16 serving as a thermal bridge. In addition, heat transfer from the column 12 to the beam 14 can be suppressed. Thereby, the temperature of the beam 14 (beam core material 24) can be suppressed below the ignition temperature. Therefore, the fire resistance of the beam 14 is ensured at the time of a fire, and the soundness of the wooden beam 14 as a structural member can be maintained. Moreover, since the heat transfer from the pillar 12 to the beam 14 can be suppressed, the fireproof coating applied to the steel pillar 12 can be thinned. From the viewpoint of design, there is a great need for a fireproof coating applied to steel columns to be a fireproof coating with a thin coating thickness. Therefore, it is effective to reduce the thickness of the fireproof coating applied to the steel columns 12.

  Furthermore, in the column beam structure 10 of the first embodiment, the heat absorbing portion 18 covers the end surfaces of the beam core material 24 and the flame stop layer 26, and the outer peripheral surface of the heat absorber 18 is flush with the outer peripheral surface of the flame stop layer 26. Therefore, it is possible to secure a sufficient concrete volume (heat capacity) for heat absorption, and to prevent heat from entering from the end face of the beam core material 24. In order to obtain an effect of preventing heat from entering from the end face of the beam core member 24, the heat absorbing portion 18 may be formed so as to cover the entire end face of the beam core member 24.

Further, in the column beam structure 10 of the first embodiment, by changing the size (distance L ₁ ) of the gap between the column 12 and the beam 14 (changing the area of the connection member 16 covered by the heat absorbing portion 18). The heat absorption performance of the heat absorption part 18 can be changed.

  Furthermore, in the column beam structure 10 of the first embodiment, when the floor slab 48 is formed by concrete placement, the heat absorption part 18 can be formed at the same time, and the construction can be rationalized.

  Next, a column beam structure according to a second embodiment of the present invention, and its operation and effect will be described.

  In the description of the second embodiment, components having the same configurations as those of the first embodiment are denoted by the same reference numerals and are appropriately omitted. As shown in FIG. 5 which is a front view of FIG. 4 and a CC cross-sectional view of FIG. 4, the column beam structure 58 of the second embodiment includes steel columns 60 and 62 arranged adjacent to each other, It has a wooden beam 14, a connecting member 64, and a floor slab 66 made of reinforced concrete as a heat absorption part.

  As shown in FIG. 4, the columns 60 and 62 are constituted by square tubular steel pipes. The beam 14 is disposed between the columns 60 and 62 disposed adjacent to each other. The floor slab 66 is provided on the beam 14. In other words, the upper surface of the beam 14 is covered by the floor slab 66, thereby ensuring fire resistance.

  The connection member 64 includes a steel support member 68 and a steel joining plate 70 as a plate member that is suspended from the support member 68 and provided integrally therewith. The support member 68 includes a support portion 72 and leg portions 74 and 76 provided downward from both left and right ends of the support portion 72. The support member 68 is installed on the upper ends of the columns 60 and 62 by mounting and joining the legs 74 and 76 to the upper ends of the columns 60 and 62.

  The joining plate 70 is coupled to the beam core 24 in the same manner as the connection member 16 is coupled to the beam core 24 in the first embodiment. That is, in a state where the joining plate 70 is inserted into the slit 30 formed in the beam core member 24, the joining plate 70 is connected to the beam core member 24 using the drift pin 40. In this way, the columns 60 and 62 and the beam 14 are connected by the connecting member 64.

A support member 68 is embedded in the floor slab 66 as a heat absorption part. That is, the support member 68 is covered with the floor slab 66. Further, a gap S ₂ (not shown) having a distance L ₂ is formed between the upper surface of the beam 14 and the lower surface of the support portion 72 by the leg portions 74 and 76 of the support member 68, and this gap S ₂ is filled. the concrete floor slab 66, the junction plate 70 of the portion exposed to the gap S ₂ in before pouring the concrete, covered by a concrete floor slab 66.

  The pillars 60 and 62 are fire-resistant coated with spray rock wool (not shown). This fireproof coating is a limit temperature at which the pillars 60 and 62 can maintain the soundness as a structural member without substantial deterioration in the proof stress of the pillars 60 and 62 at the time of fire. It is a general fireproof coating applied to the pillars 60 and 62 so that the temperature is not higher than

  The fireproof coating applied to the pillars 60 and 62 may be other than sprayed rock wool as long as the pillars 60 and 62 can be covered so as not to reach a temperature higher than the fireproof temperature in the event of a fire. For example, a wet fireproof paint, a dry rock wool sheet, a high heat resistant rock wool sheet, a thermal expansion sheet, a calcium silicate plate, or a gypsum board may be used as the fireproof coating.

  Therefore, in the column beam structure 58 of the second embodiment, in the event of a fire, the heat transferred from the heated steel columns 60 and 62 to the wooden beam 14 is transferred from the connection member 64 serving as a heat bridge as a heat absorption part. The floor slab 66 can absorb the heat transfer from the columns 60 and 62 to the beam 14. This suppresses heat transfer from the steel columns 60 and 62 to the wooden beam 14 in the column beam structure 58 in which the wooden beam 14 is disposed between the adjacent steel columns 60 and 62. Can do.

Further, a gap S ₂ (not shown) having a distance L ₂ is formed between the upper surface of the beam 14 and the lower surface of the support portion 72 by the leg portions 74 and 76 of the support member 68, and the floor slab 66 is formed in the gap S _2. concrete filling of, by the junction plate 70 of the portion exposed to the gap S ₂ before the concrete is covered by a concrete floor slab 66, absorbing heat from the junction plate 70 by the floor slab 66 can do.

  Furthermore, since the connection member 64 has a longer heat transfer path from the steel column to the wooden beam than the connection member 16 shown in the first embodiment, heat transfer from the columns 60 and 62 to the beam 14 is achieved. Can be further suppressed.

  Next, a column beam structure according to a third embodiment of the present invention, and its operation and effect will be described.

  In the description of the third embodiment, components having the same configurations as those of the first and second embodiments are denoted by the same reference numerals, and are appropriately omitted. As shown in FIG. 7 which is a front view of FIG. 6 and a DD cross-sectional view of FIG. 6, the column beam structure 78 of the third embodiment includes steel columns 60 and 62 arranged adjacent to each other, It has a wooden beam 14, a connecting member 80, and a floor slab 66 made of reinforced concrete as a heat absorption part.

  The connection member 80 is provided integrally with a steel support member 68 installed on the upper ends of the columns 60 and 62, a support beam 82 made of H-shaped steel, and suspended from the approximate center of the support beam 82. And a steel joining plate 70 as a plate member. The support beam 82 is arranged so as to be bridged between the support members 68 arranged adjacent to each other.

  The joining plate 70 is coupled to the beam core 24 in the same manner as the connection member 16 is coupled to the beam core 24 in the first embodiment. That is, in a state where the joining plate 70 is inserted into the slit 30 formed in the beam core member 24, the joining plate 70 is connected to the beam core member 24 using the drift pin 40. In this way, the columns 60 and 62 and the beam 14 are connected by the connecting member 80.

A support member 68 and a support beam 82 are embedded in the floor slab 66 as a heat absorption unit. That is, the support member 68 and the support beam 82 are covered with the floor slab 66. Further, a gap S ₃ (not shown) having a distance L ₃ is formed between the upper surface of the beam 14 and the lower surface of the support beam 82, and the concrete is struck by the concrete of the floor slab 66 filled in the gap S _3. The part of the joining plate 70 exposed in the gap S ₃ before being installed is covered with the concrete of the floor slab 66.

  As in the second embodiment, the pillars 60 and 62 are fire-resistant coated with spray rock wool (not shown). This fireproof coating is a general fireproof coating applied to the columns 60 and 62 so that the columns 60 and 62 do not reach a temperature higher than the fireproof temperature in the event of a fire.

  Therefore, in the column beam structure 78 of the third embodiment, in the event of a fire, the heat transferred from the heated steel columns 60 and 62 to the wooden beam 14 is used as a heat absorption part from the connection member 80 serving as a thermal bridge. The floor slab 66 can absorb the heat transfer from the columns 60 and 62 to the beam 14. Thereby, in the column beam structure 78, heat transfer from the steel columns 60 and 62 to the wooden beam 14 can be suppressed.

Further, a gap S ₃ (not shown) having a distance L ₃ is formed between the upper surface of the beam 14 and the lower surface of the support beam 82, and the concrete of the floor slab 66 is filled into the gap S ₃ and the concrete is driven. the junction plate 70 of the portion exposed to the gap S ₃ before you set by covering the concrete floor slab 66 can absorb the heat from the junction plate 70 by the floor slab 66.

  Furthermore, since the connection member 80 has a longer heat transfer path from the steel column to the wooden beam than the connection member 16 shown in the first embodiment, heat transfer from the columns 60 and 62 to the beam 14 is achieved. Can be further suppressed.

  Next, a column beam structure according to the fourth embodiment of the present invention, and its operation and effects will be described.

  In the description of the fourth embodiment, components having the same configurations as those of the first and second embodiments are denoted by the same reference numerals, and are appropriately omitted. As shown in FIG. 9 which is a front view of FIG. 8 and an EE cross-sectional view of FIG. 8, the column beam structure 84 of the fourth embodiment includes steel columns 60 and 62 arranged adjacent to each other, It has a wooden beam 14 arranged between columns 60 and 62 arranged adjacent to each other, a connecting member 86, and a floor slab 66 made of reinforced concrete as a heat absorption part.

  The connection member 86 is made of steel as a plate member integrally provided by hanging from a substantially central portion of the support beam 88 and a support beam 88 made of H-shaped steel installed on the upper ends of the columns 60 and 62. And a joining plate 70. The support beam 88 is joined to the upper end portions of the columns 60 and 62 by anchor reinforcing bars 92 embedded in the concrete U filled in the hollow portions 90 at the upper end portions of the columns 60 and 62.

  The joining plate 70 is coupled to the beam core 24 in the same manner as the connection member 16 is coupled to the beam core 24 in the first embodiment. That is, in a state where the joining plate 70 is inserted into the slit 30 formed in the beam core member 24, the joining plate 70 is connected to the beam core member 24 using the drift pin 40. In this way, the columns 60 and 62 and the beam 14 are connected by the connecting member 86.

A support beam 88 is embedded in the floor slab 66 as a heat absorbing portion. That is, the support beam 88 is covered with the floor slab 66. Further, a gap S ₄ (not shown) having a distance L ₄ is formed between the upper surface of the beam 14 and the lower surface of the support beam 88, and the concrete is struck by the concrete of the floor slab 66 filled in the gap S _4. The part of the joint plate 70 exposed in the gap S ₄ before being installed is covered with the concrete of the floor slab 66.

  As in the second embodiment, the pillars 60 and 62 are fire-resistant coated with spray rock wool (not shown). This fireproof coating is a general fireproof coating applied to the columns 60 and 62 so that the columns 60 and 62 do not reach a temperature higher than the fireproof temperature in the event of a fire.

  Therefore, in the column beam structure 84 of the fourth embodiment, in the event of a fire, the heat transferred from the heated steel columns 60 and 62 to the wooden beam 14 is used as a heat absorbing portion from the connection member 86 serving as a thermal bridge. The floor slab 66 can absorb the heat transfer from the columns 60 and 62 to the beam 14. Thereby, in the column beam structure 84 in which the wooden beam 14 is arranged between the adjacent steel columns 60 and 62, heat transfer from the steel columns 60 and 62 to the wooden beam 14 is suppressed. Can do.

  In addition, the heat transmitted from the heated steel columns 60 and 62 to the wooden beam 14 is also absorbed by the concrete U filled in the hollow portion 90 at the upper end of the columns 60 and 62. Heat transfer from 62 to the beam 14 can be further suppressed.

Further, a gap S ₄ (not shown) having a distance L ₄ is formed between the upper surface of the beam 14 and the lower surface of the support beam 88, and the concrete of the floor slab 66 is filled into the gap S ₄ to cast the concrete. the junction plate 70 of the portion exposed to the gap S ₄ before you set by covering the concrete floor slab 66 can absorb the heat from the junction plate 70 by the floor slab 66.

  Further, since the connection member 86 has a longer heat transfer path from the steel column to the wooden beam than the connection member 16 shown in the first embodiment, heat transfer from the columns 60 and 62 to the beam 14 is performed. Can be further suppressed.

  The first to fourth embodiments of the present invention have been described above.

  In the first to fourth embodiments, the columns 12, 60, and 62 are steel pipes, and the beam 14 is a structural member having a three-layer structure including the beam core member 24, the flame stop layer 26, and the burn allowance layer 28. As shown, the columns 12, 60, 62 may be steel column members, and the beam 14 may be a wooden beam member.

  The first to fourth embodiments of the present invention have been described above. However, the present invention is not limited to these embodiments, and the first to fourth embodiments may be used in combination. Needless to say, the present invention can be implemented in various forms without departing from the gist of the invention.

10, 58, 78, 84 Column beam structure 12, 60, 62 Column (steel column)
14 Beam (wooden beam)
16, 64, 80, 86 Connection member 18 Heat absorption part 66 Floor slab (heat absorption part)
68 Support member 70 Joining plate (plate member)

Claims (3)

Steel pillars,
Wooden beams,
A connecting member connecting the steel pillar and the wooden beam;
A heat absorption part covering the connection member;
Column beam structure with The connection member is a plate-like member that is provided to project from the steel column, and is joined to the wooden beam with a gap between the steel column,
The column beam structure according to claim 1, wherein the heat absorbing portion is formed of a cement-based solidified material that fills the gap and covers the plate-like member. The wooden beam is arranged between the steel columns arranged next to each other,
The connection member includes a support member installed on the steel columns arranged adjacent to each other, and a plate member that is provided hanging from the support member and to which the wooden beam is joined.
The column beam structure according to claim 1, wherein the heat absorption part is a concrete floor slab that covers the support member.

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