JP3944407B2 - Ceiling fireproof structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a ceiling fireproof structure that suppresses early falling off of a ceiling base material and improves a membrane effect.
[0002]
[Prior art]
In the ceiling structure of a building structure, the ceiling base material is screwed directly to the ceiling edge located under the steel beam that supports the floor, and then the finishing material is joined to the ceiling base material, such as staples. Generally, it is constructed by fastening with a material.
In the above ceiling structure, as a membrane that suppresses the temperature rise of the floor and steel beams by preventing the ceiling base material and finishing material from hitting the floor and steel beams on the ceiling base material in the event of a fire Is known to play a role.
[0003]
Various inventions and devices have already been made for ceiling structures that expect such a membrane effect. For example, in the invention of “ceiling finishing structure” described in Japanese Patent Application Laid-Open No. 10-325204, a structure is proposed in which a rock wool sound-absorbing material having excellent fire resistance is used as a ceiling finishing material. On the other hand, in the invention of “ceiling joint reinforcement structure” described in Japanese Patent Laid-Open No. 10-30007, a ceiling joint reinforcement structure that is a weak point in securing fire resistance is proposed.
[0004]
With the invention, development and practical application of such a ceiling structure, it has become possible to gradually improve the fire resistance of buildings. However, the conventional ceiling structure currently has only an effect that can resist a fire of about 15 to 30 minutes from the start of heating under the standard heating conditions of ISO, for example. The material falls. For this reason, it can be said that the heat shielding effect by the ceiling has a limit at present.
[0005]
[Problems to be solved by the invention]
In order to enjoy a sufficient membrane effect in the ceiling structure, it is important that the ceiling base material does not fall off from the ceiling edge at the time of a fire. Here, as one of the causes of the early dropout of the ceiling at the time of a fire, the ceiling base material falls off from the ceiling edge due to the generation of contraction force accompanying the shrinkage of the material.
[0006]
That is, in the above ceiling structure, the water in the ceiling base material evaporates and contracts due to heating in the event of a fire, causing a number of cracks in the ceiling base material. Here, when the ceiling base material is fixed in close contact with the ceiling field edge, the ceiling base material is largely restrained by the ceiling field edge with a screw, and a large shrinkage force acts on the ceiling base material. The ceiling base material is destroyed by the action of the large shrinkage force, and a phenomenon occurs in which the ceiling base material and the finishing material fall off from the ceiling edge at a relatively low temperature.
Therefore, it is not possible to expect a membrane effect that greatly improves the fireproof performance with a normal ceiling structure. Therefore, how to prevent the ceiling from falling is an important point for improving performance.
[0007]
[Means for Solving the Problems]
The present invention was made to solve the above-mentioned drawbacks of the prior art, and the ceiling fireproof structure of the present invention is a heat-soluble member having a predetermined thickness between the ceiling base material 1 and the ceiling field edge 2. 3 insert the ceiling base member 1 and the thermofusible element 3 fastened to the ceiling ceiling joist 2 by fasteners 4, the heat soluble member 3, shaped and having a groove in the member longitudinally or member width direction, member longitudinally Or it was made the shape which has a hollow part in the member width direction .
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a perspective view of a ceiling fireproof structure of the present invention. The ceiling fireproof structure of the present invention is provided under an upper floor and a steel beam [both not shown] that supports the upper floor.
[0009]
A rectangular parallelepiped block-shaped heat-soluble member 3 having a predetermined thickness is spaced apart in the longitudinal direction of the ceiling field edge 2 below the steel ceiling field edge 2 disposed at regular intervals on the ceiling. Several are attached. A ceiling base material 1 such as a gypsum board is attached below these heat-soluble members 3. The ceiling base material 1 is fastened to the heat-soluble member 3 and the ceiling edge 2 by fasteners 4 such as screws and nails. A finishing material 5 such as a rock wool sound absorbing plate is fastened to the lower surface of the ceiling base material 1 with staples 6.
[0010]
In the present invention, the heat-soluble member 3 inserted between the ceiling base material 1 and the ceiling edge 2 is deformed and melted at about 100 ° C. in order to suppress the occurrence of cracks in the ceiling base material 1 due to the contraction force action. It is made of a material with the properties to be released This is because the evaporation of moisture in the gypsum board, which is the ceiling base material, occurs when the temperature is around 100 ° C., and the gypsum board rapidly shrinks and deteriorates near this temperature.
As an inexpensive material having the conditions of the heat-soluble member 3 of the present invention, there is a thermoplastic plastic. This typical material is polyethylene, and has a characteristic of starting to deform at 100 ° C. or lower and melting at about 100 ° C. to 140 ° C.
[0011]
FIG. 2A is a cross-sectional view of the ceiling fireproof structure of the present invention. Fasteners 4 placed from under the ceiling base material 1 penetrate the heat-soluble member 3 between the ceiling base material 1 and the ceiling field edge 2 and reach the ceiling field edge 2. That is, the ceiling base material 1 is fastened to the ceiling field edge 2 with the heat-soluble member 3 interposed therebetween, so that the ceiling base material 1 is prevented from falling off during normal times. In addition, since the heat-soluble member 3 exists between the ceiling base material 1 and the ceiling edge 3, vibration from the upper floor is absorbed by the heat-soluble member 3 and sound insulation is improved.
[0012]
On the other hand, in the event of a fire, as shown in FIG. 2 (b), the heat-soluble member 3 between the ceiling base material 1 and the ceiling edge 2 is dissolved, and the clearance corresponding to the thickness of the heat-soluble member 3 becomes the ceiling base. It is ensured between the material 1 and the ceiling edge 2.
[0013]
At the time of a fire, the ceiling base material 1 is greatly deformed due to shrinkage of the ceiling base material 1 due to evaporation of moisture. In the ceiling fireproof structure of the present invention, the ceiling base material 1 is allowed to deform within the range of the clearance generated by melting the heat-soluble member 3, and the fastener 4 fastened to the ceiling edge 2 is also the ceiling base material. 1 can be followed. Accordingly, the ceiling base material 1 is less restrained, and the ceiling base material 1 is destroyed and dropped off due to the contraction force, and the membrane effect is further improved.
[0014]
Moreover, you may make the heat-soluble member 3 into the shape which has a groove | channel in a member longitudinal direction or a member width direction, or a shape which has a hollow part in a member longitudinal direction or a member width direction. In this case, since the heat-soluble member 3 dissolves faster than a solid case, the followability to the contraction deformation of the gypsum board is improved, and the membrane effect of the ceiling fireproof structure can be further enhanced.
[0015]
For example, as shown in FIG. 2 (c), a thermoplastic plastic is formed into a hat shape (both side flanges of a U-shaped cross-section member are bent outward at the same length from the flange rising portion). If the web portion is bonded to the ceiling edge 2 in advance, the followability to the shrinkage deformation of the gypsum board is further improved.
In addition, for example, in a block-shaped thermoplastic molded into a rectangular parallelepiped or the like, (A) when drilling in the member longitudinal direction or member width direction to form a hollow portion, or (B) member longitudinal direction or member width direction Even when grooves are formed from both sides to reduce the area of the longitudinal section, the followability to the contraction deformation of the gypsum board can be improved.
[0016]
【Example】
FIG. 3A shows an embodiment of the present invention. In the embodiment, the hanger 9 is suspended from the lower surface of the composite deck 7 configured using a deck plate having a thickness of 1.2 mm, and the field receiver 8 is held on the hanger 9 via the support hardware 10. . The field edge receiver 8 is a grooved steel of 38 mm × 12 mm × thickness 1.2 mm, and further supports the field edge 2 of the lip grooved steel via a metal 11. Unlike the illustration of FIG. 1 and FIG. 2, the field edge in a present Example is a channel steel of an open cross section. The size of the lip channel steel of the field edge 2 is typically 25 mm × 19 mm × 0.5 mm thickness, and a rectangular box-like heat-soluble member 3 is attached to the web surface with an adhesive in advance. Yes.
[0017]
FIG. 3B shows an enlarged view of the field edge and the heat-soluble member. In this example, unlike FIG. 1, a heat-soluble member 3 having a continuous form over the entire length of the field edge 2 is used. The heat-soluble member 3 is a box material having a size of 25 mm × 20 mm × thickness 2 mm, and is made of polyethylene. In this example, a gypsum board (thickness 9 mm) is used for the ceiling base material 1, and a fastener 4 (a screw having a diameter of 4 mm) passes through the heat-soluble member 3 from the base material 1 and is made of lip channel steel. It has been laid to the field edge 2. The finishing material 5 is a rock wool sound absorbing plate (thickness 9 mm), and is fixed to the base material 1 with staples 6.
[0018]
As a result of performing a standard fire resistance test on the ceiling / floor structure configured as described above under the condition of ISO heating, the shrinkage constraint acting on the ceiling base material 1 is reduced by the installation of the heat-soluble member 3. As a result, an increase in fire resistance time of about 20% to 30% has been observed.
[0019]
【The invention's effect】
In the ceiling fireproof structure of the present invention, the ceiling base material is fastened to the edge of the ceiling across the heat-soluble member, and the ceiling base material is prevented from falling off during normal times. Further, since the heat-soluble member exists between the ceiling base material and the ceiling edge, vibration from the upper floor is absorbed by the heat-soluble member, and sound insulation is improved.
[0020]
On the other hand, in the event of a fire, the deformation of the ceiling base material is allowed within the range of the clearance generated by the melting of the heat-soluble member, and the fasteners fastened to the ceiling edge can also follow the deformation of the ceiling base material. It is like that. Therefore, the restraint of the ceiling base material is reduced, the destruction and dropping off of the ceiling base material due to the contraction force is delayed, and the membrane effect is further improved.
[Brief description of the drawings]
FIG. 1 is a perspective view of a ceiling fireproof structure of the present invention.
2A is a cross-sectional view of the ceiling fireproof structure of the present invention, and FIG. 2B is a cross-sectional view of the ceiling fireproof structure of the present invention during a fire. Moreover, (c) is a cross-sectional view of a modification of the ceiling fireproof structure of the present invention.
3A is a cross-sectional view of a ceiling fireproof structure in an embodiment of the present invention, and FIG. 3B is an enlarged view of a field edge and a heat-soluble member in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Ceiling base material 2 Ceiling field edge 3 Heat-soluble member 3a Hat-shaped heat-soluble member 4 Fastener 5 Finishing material 6 Staple 7 Synthetic deck 8 Field edge receiver 9 Hanger 10 Supporting hardware 11 Hardware

Claims (2)

Insert the thermofusible member having a predetermined thickness between the ceiling base member and the ceiling ceiling joists, fastened to the ceiling ceiling joist ceiling base material and the thermofusible element in the fastener, the heat soluble member, member longitudinally or A ceiling fireproof structure characterized by having a shape having grooves in the member width direction . Insert the thermofusible member having a predetermined thickness between the ceiling base member and the ceiling ceiling joists, fastened to the ceiling ceiling joist ceiling base material and the thermofusible element in the fastener, the heat soluble member, member longitudinally or A ceiling fireproof structure characterized by having a shape having a hollow portion in a member width direction .

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