JP6512436B2 - Bonded structure of fireproof wood beam and floor - Google Patents

Description

  The present invention relates to a joint structure of fireproof wood beams and a floor and a method of constructing the same, and more particularly to a joint structure of fireproof wood beams and a reinforced concrete floor and a construction method thereof.

  DESCRIPTION OF RELATED ART Conventionally, the fireproof wooden beam which has fireproof performance is known (refer the patent documents 1-4). This refractory wood beam can be roughly classified into the following three types (a) to (c) as shown in FIG.

(A) Burnout layer 1 (a layer that forms a thermal insulation layer by self-combustion and carbonization), burnout layer 2 (a layer that prevents burning and carbonization of the burnout layer), load support portion 3 (burnout layer and The part that supports the load protected by the burning margin layer).

(B) Coating layer 4 (a layer for suppressing the temperature rise of the wood material of the load support portion, and a heat insulating layer composed of an inorganic material such as gypsum board or calcium silicate plate) and the load support portion 3 What is configured.

(C) The flame retardant layer 1 and the load support portion 3 are provided.

  A floor 5 such as a reinforced concrete (hereinafter referred to as RC) structure, an ALC panel or a wood structure is usually attached to the upper surface of the beam as described above. When focusing on RC flooring, as a general construction method, as shown in FIG. 8 (1), plywood 6 for concrete formwork is installed and concrete is cast, and the said plywood 6 is hardened after hardening the concrete. And a method of installing the deck plate 7 and placing concrete as shown in FIG. 8 (2).

  As shown in Fig. 8 (3), in the connection between the floor 5 and the firewood layer 1, fireproof layer 2, coating layer 4 and so on of the fireproof wood beam constructed by these methods, the construction accuracy is secured. A fine gap 8 may occur due to the difficulty or the drying shrinkage of the material for protecting the load supporting portion 3 such as the burning margin layer 1 due to aging. Moreover, in the case of the floor 5 using the deck plate 7, in addition to the gap 8, the deck plate 7 is made of steel and is easier to transfer heat than concrete, so it becomes a thermal bridge and can accelerate heat penetration into the interior There is sex. In addition, since the deck plate 7 bends in the early stage of a fire and peels from RC part, suppression of the temperature rise by the heat capacity of concrete can not be anticipated.

  The heat bridge by the gap 8 between the upper end surface of the burnout layer 1, the burnout layer 2, the cover layer 4 and the lower end surface of the RC floor 5 and the deck plate 7 becomes a weak point when subjected to fire heating. In this case, damage to the wooden material of the load support portion 3 (such as cross section loss due to carbonization or combustion) may occur, and in the worst case, it may lead to the beam collapse.

JP, 2013-83104, A JP, 2013-11080, A JP, 2012-219560, A JP, 2012-219559, A

  For this reason, the infiltration of hot air from the gap generated between the upper end surface of the burnout layer, the burnout layer, the cover layer, etc. and the lower end surface of the RC floor, etc. There has been a need for techniques to prevent material damage.

  The present invention has been made in view of the above, and it is an object of the present invention to provide a joint structure of a fireproof wood beam and a floor which can prevent hot air from entering the wood load support portion and a construction method thereof. .

  In order to solve the above-described problems and achieve the object, the joint structure of a fireproof wood beam and a floor according to the present invention is disposed on a load supporting portion made of a wood material and outside the load supporting portion. A joint structure of a fireproof wood beam provided with an outer layer comprising at least one of a flameproof layer and a cover layer, and a floor attached to the upper surface thereof, wherein the upper end face of the load supporting portion is the outer layer The floor is disposed so as to be lower than the upper end surface, and the floor is installed on the upper end surface of the load support portion and the outer layer.

  In the joint structure for another fireproof wooden beam and floor according to the present invention, in the above-mentioned invention, a moisture-proof layer having a moisture-proof property is provided at the interface between the load support portion and the outer layer and the floor. It is characterized by

  In the bonded structure according to the present invention, the floor is formed by using a deck plate in the above-described invention, and a hooking margin of the deck plate to the load support portion is provided. A load transfer material having thermal insulation is provided between the lower surface and the upper end surface of the load support portion.

  Moreover, in the joint structure of another fireproof wooden beam and floor according to the present invention, in the above-mentioned invention, a heating foam material which foams at the time of heating is provided between the lower surface of the floor and the upper end surface of the outer layer. It is characterized by

  In the bonded structure according to the present invention, in the above-mentioned invention, an elastic refractory material having bulk elasticity and flameproofness between the lower surface of the floor and the upper end surface of the outer layer is provided. Is provided.

  Moreover, the joint structure of another fireproof wooden beam and floor according to the present invention is characterized in that, in the above-mentioned invention, the floor is a reinforced concrete floor.

  Further, a method of constructing a joint structure of a fireproof wood beam and a floor according to the present invention is a method of constructing the joint structure of a fireproof wood beam and a floor described above, wherein the upper end face of the load support portion is above the outer layer. The floor is disposed on the upper end surface of the load support portion and the outer layer after being disposed so as to be lower than the end surface.

  According to the joint structure of the fireproof wood beam and the floor according to the present invention, the load supporting portion made of wood material and the at least one of the burnout layer, the burnout layer and the covering layer which are disposed outside the load supporting portion And a floor mounted on the upper surface of the fireproof wooden beam, wherein the upper end surface of the load supporting portion is disposed lower than the upper end surface of the outer layer; Since the floor is installed on the load supporting portion and the upper end face of the outer layer, even if the upper end face of the outer layer falls below the lower end face of the floor to create a gap between the outer layer and the floor, Hot air entering from the floor is prevented from invading the load supporting portion by the floor installed on the upper end surface of the load supporting portion. For this reason, it is effective in the ability to prevent the penetration | invasion of the heat air to the load support part of wood from a clearance gap.

  Further, according to another joint structure of fireproof wood beam and floor according to the present invention, a moisture-proof layer having a moisture-proof property is provided on the interface between the load support portion and the outer layer and the floor. When installing a floor by casting, etc., it is possible to prevent the load supporting portion and the outer layer from absorbing moisture and the like generated from the floor.

  Further, according to another joint structure of fireproof wood beams and a floor according to the present invention, the floor is formed using a deck plate, and the hook plate lower surface of the deck plate to the load support portion and the floor. Since the load transfer material having the heat insulating property is provided between the upper end surface of the load support portion, temporarily the upper end surface of the outer layer is lower than the lower end surface of the deck plate to create a gap between the outer layer and the deck plate. Even in the case of a fire, hot air that has entered from the gap is prevented from entering the load support portion by the heat transfer material having thermal insulation. For this reason, it is effective in the ability to prevent the penetration | invasion of the heat air to the load support part of wood from a clearance gap.

  Further, according to the joint structure of another fireproof wood beam and floor according to the present invention, since the heating foam material which foams at the time of heating is provided between the lower surface of the floor and the upper end surface of the outer layer Even if the upper end face of the layer is lowered below the lower end face of the floor to form a gap between the outer layer and the floor, the heated foam material is heated by the heat of the fire to foam and fill the gap. As a result, it is possible to prevent the heat air from entering the load supporting portion of the wood from the gap.

  Further, according to another joint structure of fireproof wood beams and floor according to the present invention, an elastic refractory material having bulk elasticity and flameproofness is provided between the lower surface of the floor and the upper end surface of the outer layer. Therefore, even if the upper end face of the outer layer is lowered below the lower end face of the floor to form a gap between the outer layer and the floor, the elastic refractory material expands due to bulk elasticity to fill the gap. As a result, it is possible to prevent the heat air from entering the load supporting portion of the wood from the gap.

  Further, according to another joint structure of fireproof wood beams and floor according to the present invention, since the floor is a reinforced concrete floor, for example, a form for placing concrete is disposed beside the upper end of the outer layer. The concrete is cast from the upper surface of the formwork to the upper end surface of the outer layer and the load supporting portion, so that the construction can be simplified.

  Further, according to the method of constructing a joint structure of fireproof wood beams and a floor according to the present invention, there is provided a method of constructing the joint structure of fireproof wood beams and a floor described above, wherein the upper end face of the load support portion is the outer layer. And the floor is installed on the upper end face of the load support portion and the outer layer, so that it is possible to prevent hot air from entering the gap and joining the floor with a fireproof wood beam An effect is obtained that the structure can be easily obtained.

FIG. 1 is a cross-sectional view showing Embodiment 1 of a bonded structure of a fireproof timber beam and a floor according to the present invention and a construction method thereof. FIG. 2 is an enlarged view of a portion A of FIG. 1, (1) shows a state at the time of construction, and (2) a state after construction and at the time of use of the building. FIG. 3 is a cross-sectional view showing a second embodiment of the joint structure of fireproof wood beam and floor according to the present invention and the construction method thereof. FIG. 4 is an enlarged view of a portion A of FIG. 3, in which (1) shows a state at the time of construction and (2) a state after construction and at the time of use of the building. FIG. 5 is a partially enlarged view showing the third embodiment of the joint structure of fireproof wood beam and floor according to the present invention and the construction method thereof, wherein (1) shows a state at the time of construction, (2) after construction and use of building It is a state of time. FIG. 6 is a partially enlarged view showing a fourth embodiment of the joint structure of fireproof wood beam and floor according to the present invention and the construction method thereof, wherein (1) shows a state at the time of construction, (2) after construction and use of building It is a state of time. FIG. 7 is a schematic cross-sectional view of a conventional fireproof wooden beam. Fig. 8 is an explanatory view of a weak point formed in the connection between a conventional fireproof wooden beam and a reinforced concrete floor, and (1) is a concrete cast when using plywood for concrete form, (2) is (3) is an enlarged view of part A of (1) and (2) when concrete is cast using a deck plate.

  DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The connection structure of a fireproof wood beam and floor according to the present invention and an embodiment of the construction method thereof will be described in detail below based on the drawings. The present invention is not limited by the embodiment.

Embodiment 1
First, the first embodiment of the present invention will be described.
As shown in FIG. 1, the joint structure 100 for a fireproof wood beam and floor according to the first embodiment of the present invention comprises a fireproof wood beam 10 and an RC floor 12 (floor) attached to the top surface of the fireproof wood beam 10. Junction structure.

  The refractory wood beam 10 is made of a wood material, and includes a load support portion 14 for supporting a load, and an outer layer 16 disposed outside the load support portion 14. As described in FIG. 7 described above, the outer layer 16 is composed only of (a) the burning layer 1 and the burning layer 2 or (b) only the coating layer 4 or (c) only the burning layer 1 can do. The functions of the burnout layer 1, the burnout layer 2, and the covering layer 4 are as described in FIG. 7 above.

  As shown in FIG. 2, the upper end surface 14 a of the load support portion 14 is disposed lower than the upper end surface 16 a of the outer layer 16, and the RC floor is formed on the upper end surfaces 14 a and 16 a of the load support portion 14 and the outer layer 16. 12 have been installed.

  When constructing the joint structure 100 according to the present embodiment, as shown in FIG. 2 (1), the upper end surface 14 a of the load support portion 14 is disposed lower than the upper end surface 16 a of the outer layer 16. After that, a plywood form 20 for placing concrete and a reinforcing bar (not shown) are placed beside the upper end of the outer layer 16. Subsequently, concrete is cast from the upper surface 20a of the plywood form 20 to the outer layer 16 and the upper end faces 16a and 14a of the load support portion 14 to construct the RC floor 12, and after hardening the concrete, the plywood form 20 is removed. Do. By doing this, the junction structure 100 according to the present embodiment can be easily constructed.

  Here, when it is necessary to prevent the water content of the concrete to be cast from absorbing the moisture of the wood material of the outer layer 16 and the load support portion 14 such as the burnout layer, the burnout layer and the cover layer, It is desirable to provide a moisture-proof layer 18 for preventing moisture absorption on the surface of these parts which will be the interface with cast concrete. The moisture-proof layer 18 may be formed by applying waterproof coating to the boundary surface or laying an extremely thin polymer resin sheet (for example, a sheet containing an alkali-soluble resin component such as a copolyester resin). Can.

  On the other hand, as shown in FIG. 2 (2), the upper end surface 16 a of the outer layer 16 is temporarily lower than the lower end surface 12 a of the floor 12 after construction and during use of the building, and a gap is formed between the outer layer 16 and the RC floor 12. Even if 22 is generated, the hot air entering from the gap 22 at the time of fire is prevented from entering the load support 14 by the RC floor 12 installed on the upper end surface 14 a of the load support 14. For this reason, according to the present embodiment, it is possible to prevent the heat air from intruding from the gap 22 to the load supporting portion 14 of wood. Thereby, the fireproof performance of the connection part of the fireproof wooden beam 10 and the RC floor 12 can be maintained.

Second Embodiment
Next, a second embodiment of the present invention will be described.
As shown in FIG. 3, the joint structure 200 for a fireproof wood beam and floor according to the second embodiment of the present invention is constructed using the deck plate 24 instead of the plywood form 20 in the above first embodiment. It is a thing. In the following, description of the same members as those described in the first embodiment is omitted.

  When constructing the joint structure 200 according to the present embodiment, as shown in FIG. 4 (1), the upper end surface 14 a of the load support portion 14 is disposed lower than the upper end surface 16 a of the outer layer 16. Afterward, the deck plate 24 is disposed with a predetermined allowance from the side of the upper end of the outer layer 16 toward the upper side of the load support portion 14. Here, a mortar block 26 as a load transfer material having thermal insulation is disposed between the entire lower surface 24 a of the deck plate 24 to the load support portion 14 and the upper end surface 14 a of the load support portion 14. Note that, instead of the mortar block 26, for example, a load transfer material having heat insulation such as a concrete block may be disposed. Subsequently, concrete is poured from the upper surface of the deck plate 24 over the upper end surface 14 a of the load support portion 14 to construct an RC floor 12. The deck plate 24 remains after construction. By so doing, the junction structure 200 according to the present embodiment can be easily constructed.

  Here, when it is necessary to prevent the water content of the concrete to be cast from absorbing the moisture of the wood material of the outer layer 16 and the load support portion 14 such as the burnout layer, the burnout layer and the cover layer, As in the case of the first embodiment described above, it is desirable to provide the moisture-proof layer 18 on the surface of these portions which will be the interface with the cast concrete and the mortar block 26.

  On the other hand, as shown in FIG. 4 (2), even if the upper end surface 16 a of the outer layer 16 falls below the lower surface of the deck plate 24 to form a gap 22 between the outer layer 16 and the deck plate 24, Hot air entering from the gap 22 is prevented from entering the load support portion 14 by the mortar block 26 disposed on the entire lower surface 24 a of the deck plate 24. For this reason, according to the present embodiment, it is possible to prevent the heat air from intruding from the gap 22 to the load supporting portion 14 of wood. Thereby, the fireproof performance of the connection part of the fireproof wooden beam 10 and the RC floor 12 can be maintained.

Third Embodiment
Next, a third embodiment of the present invention will be described.
As shown in FIG. 5 (1), the joint structure 300 for a fireproof wood beam and floor according to the third embodiment of the present invention is the upper end face 16 a of the outer layer 16 and the RC floor 12 in the above first embodiment. Between the lower surface of and, the heating foam material 28 which foams at the time of heating is provided.

  The heat-foamable material 28 can be constituted using a heat-foamable sheet which contains expanded graphite or ammonium polyphosphate as a main component and which is foamed at a high temperature (for example, about 200 to 300 ° C.).

  Here, it is necessary to prevent the moisture in the concrete to be cast from being absorbed by the wood material of the outer layer 16 such as the burnout layer, the burnout layer, the cover layer, the heating foam material 28 and the load support portion 14 In the same manner as in the first embodiment described above, it is desirable that the moisture-proof layer 18 be provided on the surface of these portions which is the interface with the cast concrete.

  On the other hand, after construction and when the building is in use, as shown in FIG. 5 (2), temporarily the upper end face 16 a of the outer layer 16 is lower than the lower end face of the RC floor 12 and the outer layer 16 and the RC floor 12 Even if there is a gap 22 between them, the heated foam material 28 is heated by the hot air at the time of fire to foam and fill the gap 22. For this reason, according to the present embodiment, it is possible to prevent the heat air from intruding from the gap 22 to the load supporting portion 14 of wood. Thereby, the fireproof performance of the connection part of the fireproof wooden beam 10 and the RC floor 12 can be maintained.

Embodiment 4
Next, the fourth embodiment of the present invention will be described.
As shown in FIG. 6 (1), the joint structure 400 for a fireproof wood beam and floor according to Embodiment 4 of the present invention is the upper end face 16 a of the outer layer 16 and the RC floor 12 in the above-mentioned Embodiment 1. The elastic refractory material 30 having bulk elasticity and flameproofness (and / or heat insulation) is provided between the lower side of the and the lower side thereof. As the elastic refractory material 30, it can comprise, for example using materials, such as a ceramic fiber blanket and silicone rubber.

  Here, it is necessary to prevent the moisture in the cast concrete from being absorbed by the wood material of the outer layer 16 such as the burnout layer, the burnout layer, the cover layer, the elastic refractory material 30 and the load support portion 14 and the like. In the same manner as in the first embodiment described above, it is desirable that the moisture-proof layer 18 be provided on the surface of these portions which is the interface with the cast concrete.

  On the other hand, after construction and when using the building, as shown in FIG. 6 (2), temporarily the upper end face 16a of the outer layer 16 is lower than the lower end face of the RC floor 12 and the outer layer 16 and the RC floor 12 Even if there is a gap 22 between them, the elastic refractory material 30 expands due to bulk elasticity and fills the gap 22. For this reason, according to the present embodiment, it is possible to prevent the heat air from intruding from the gap 22 to the load supporting portion 14 of wood. Thereby, the fireproof performance of the connection part of the fireproof wooden beam 10 and the RC floor 12 can be maintained.

  The above-described third and fourth embodiments correspond to the case where concrete of the RC floor 12 is cast using the synthetic form 20, but the deck plate 24 is used as in the second embodiment. The present invention is also applicable to the case of casting concrete of RC floor 12, and also in this case, the same function and effect as described above can be obtained.

  Further, in the above embodiment, although the RC floor has been described as an example of the floor attached to the upper surface of the fireproof timber beam 10, the present invention is not limited to this, for example, from materials such as ALC panels The present invention is also applicable to the case of the floor, in which case the same effects as those of the present invention can be exhibited.

  As explained above, according to the joint structure of a fireproof wood beam and a floor according to the present invention, the load supporting portion made of wood material, and the flame retardant layer, the burn-out layer and the coating which are disposed outside the load supporting portion. A joint structure of a fireproof wood beam provided with an outer layer comprising at least one layer and a floor attached to the upper surface thereof, wherein the upper end surface of the load support portion is lower than the upper end surface of the outer layer Because the floor was installed on the upper end surface of the load support portion and the outer layer, the upper end surface of the outer layer was lower than the lower end surface of the floor so that a gap was generated between the outer layer and the floor. Even in the case of a fire, hot air entering from the gap is prevented from entering the load support by the floor installed on the upper end face of the load support. For this reason, it is possible to prevent the heat air from entering the load supporting portion of wood from the gap.

  Further, according to another joint structure of fireproof wood beam and floor according to the present invention, a moisture-proof layer having a moisture-proof property is provided on the interface between the load support portion and the outer layer and the floor. When the floor is constructed by casting, it is possible to prevent the load supporting portion and the outer layer from absorbing moisture or the like generated from the floor.

  Further, according to another joint structure of fireproof wood beams and a floor according to the present invention, the floor is formed using a deck plate, and the hook plate lower surface of the deck plate to the load support portion and the floor. Since the load transfer material having the heat insulating property is provided between the upper end surface of the load support portion, temporarily the upper end surface of the outer layer is lower than the lower end surface of the deck plate to create a gap between the outer layer and the deck plate. Even in the case of a fire, hot air that has entered from the gap is prevented from entering the load support portion by the heat transfer material having thermal insulation. For this reason, it is possible to prevent the heat air from entering the load supporting portion of wood from the gap.

  Further, according to the joint structure of another fireproof wood beam and floor according to the present invention, since the heating foam material which foams at the time of heating is provided between the lower surface of the floor and the upper end surface of the outer layer Even if the upper end face of the layer is lowered below the lower end face of the floor to form a gap between the outer layer and the floor, the heated foam material is heated by the heat of the fire to foam and fill the gap. Thereby, it is possible to prevent hot air from entering the load supporting portion of wood from the gap.

  Further, according to another joint structure of fireproof wood beams and floor according to the present invention, an elastic refractory material having bulk elasticity and flameproofness is provided between the lower surface of the floor and the upper end surface of the outer layer. Therefore, even if the upper end face of the outer layer is lowered below the lower end face of the floor to form a gap between the outer layer and the floor, the elastic refractory material expands due to bulk elasticity to fill the gap. Thereby, it is possible to prevent hot air from entering the load supporting portion of wood from the gap.

  Further, according to another joint structure of fireproof wood beams and floor according to the present invention, since the floor is a reinforced concrete floor, for example, a form for placing concrete is disposed beside the upper end of the outer layer. It is possible to construct simply by casting concrete from the upper surface of this formwork over the outer layer and the upper end face of the load support portion.

  Further, according to the method of constructing a joint structure of fireproof wood beams and a floor according to the present invention, there is provided a method of constructing the joint structure of fireproof wood beams and a floor described above, wherein the upper end face of the load support portion is the outer layer. And the floor is installed on the upper end face of the load support portion and the outer layer, so that it is possible to prevent hot air from entering the gap and joining the floor with a fireproof wood beam The structure can be easily obtained.

  As described above, the joint structure of the fireproof wood beam and the floor according to the present invention and the construction method thereof are useful for the joint structure of the fireproof wood beam and the RC floor equipped with the wood load support portion, and in particular It is suitable for preventing the heat air from entering the load supporting portion of wood from a gap or the like.

10 Fireproof wood beam 12 RC floor (floor)
14 load support portion 14a upper end surface 16 outer layer 16a upper end surface 18 moisture-proof layer 20 plywood formwork 20a upper surface 22 gap 24 deck plate 24a hook portion lower surface 26 mortar block (load transfer material)
28 Heated foam material 30 Elastic refractory material 100, 200, 300, 400 Bonded structure of fireproof wood beam and floor

Claims (4)

Attached to the upper surface of a fireproof wood beam provided with a load support made of wood material, and an outer layer disposed outside the load support and comprising at least one of a burn-through layer, a burn-out layer and a covering layer Joint structure with the floor to be
The upper end surface of the load support portion is disposed lower than the upper end surface of the outer layer, and the floor is installed on the upper end surfaces of the load support portion and the outer layer ,
The floor is formed using a deck plate,
A load transfer material having a heat insulating property is provided between the lower surface of the deck plate to the load support portion and the upper end surface of the load support portion . Attached to the upper surface of a fireproof wood beam provided with a load support made of wood material, and an outer layer disposed outside the load support and comprising at least one of a burn-through layer, a burn-out layer and a covering layer Joint structure with the floor to be
The upper end surface of the load support portion is disposed lower than the upper end surface of the outer layer, and the floor is installed on the upper end surfaces of the load support portion and the outer layer,
Resistant fire wood beams and floor junction structure characterized in that a heat-foamable material which foams at the time of heating between the upper end surface of the lower surface and the outer layer of the floor. Attached to the upper surface of a fireproof wood beam provided with a load support made of wood material, and an outer layer disposed outside the load support and comprising at least one of a burn-through layer, a burn-out layer and a covering layer Joint structure with the floor to be
The upper end surface of the load support portion is disposed lower than the upper end surface of the outer layer, and the floor is installed on the upper end surfaces of the load support portion and the outer layer,
, Volume elasticity and resistance to fire wood beams you characterized in that an elastic refractory material having Saegien property and floor junction structure between the upper end surface of the outer layer and the lower surface of the floor. The said floor is a reinforced concrete floor, The connection structure of the fireproof wood beam and floor as described in any one of Claims 1-3 characterized by the above-mentioned.

Images