JP6944795B2 - Fireproof structure and construction method of fireproof structure - Google Patents

Description

The present invention relates to a fireproof structure and a method of constructing a fireproof structure.

Conventionally, as a method of inserting a duct through a through hole formed in a steel beam, for example, a fireproof coating is wound around the steel beam, a notch is made at a position corresponding to the through hole in the fireproof coating, and the duct is inserted into this notch. A method has been proposed (see, for example, Patent Document 1).

JP-A-2015-117508

Here, in order to prevent heat from escaping to the outside of the duct, a heat insulating material may be wrapped around the duct. In that case, the duct, the heat insulating material, and the refractory coating are located inside the through hole. Therefore, in order to fit these within the diameter of the through hole, the beam diameter is increased in order to increase the diameter of the through hole of the beam. It is necessary and the floor height will increase. Further, the diameter of the duct may be reduced according to the diameter of the through hole, but in that case, the air conditioning performance is deteriorated. Therefore, there has been a demand for a fireproof structure capable of suppressing a decrease in air conditioning performance while suppressing an increase in floor height.

The present invention has been made in view of the above, and an object of the present invention is to provide a fireproof structure capable of suppressing an increase in floor height and a decrease in air conditioning performance.

In order to solve the above-mentioned problems and achieve the object, the fireproof structure according to claim 1 is attached to the insertion tube material inserted into the beam through hole formed in the web of the beam and the outer peripheral surface of the insertion tube material. A beam having the attached pipe material side fireproof coating and a beam side fireproof coating covering the side and the lower side of the beam, and the insertion pipe material and the pipe material side fireproof coating penetrating the portion covering the side of the beam. The side fireproof coating, the joint pipe material connected to the end portion of the insertion pipe material along the joint direction of the insertion pipe material, and the side end portion of the pipe material side fireproof coating are attached from the outer peripheral surface of the joint pipe material. The heat insulating material is provided, and at least a part of the heat insulating material rides on the side end portion of the pipe material side fireproof coating, and the end portion of the heat insulating material facing the beam is the beam side fireproof coating. It abuts on the portion of the beam that covers the side of the beam.

The refractory structure according to claim 2 is the refractory structure according to claim 1, and the refractory coating on the pipe material side is a dry-wound refractory coating.

The method for constructing the fireproof structure according to claim 3 includes an insertion pipe material insertion step for inserting the insertion pipe material into a beam through hole formed in the web of the beam, and a pipe material for attaching a pipe material side fireproof coating to the outer peripheral surface of the insertion pipe material. A step of attaching a side fireproof coating and a step of installing a beam side fireproof coating that covers the side and the lower side of the beam with a beam side fireproof coating. A beam-side fireproof coating installation step for penetrating the joint pipe material, a joint pipe material connecting step for connecting the joint pipe material to the end of the insertion pipe material along the joint direction of the insertion pipe material, and the pipe material side fireproof coating from the outer peripheral surface of the joint pipe material. Including a heat insulating material mounting step of mounting the heat insulating material so as to reach the side end portion of the heat insulating material, at least a part of the heat insulating material rides on the side end portion of the pipe material side fireproof coating and faces the beam in the heat insulating material. The end portion on the side of the beam abuts on the portion of the beam-side fireproof coating that covers the side of the beam.
The method for constructing the fireproof structure according to claim 4 is the method for constructing the fireproof structure according to claim 3, wherein the insertion pipe material is cylindrical, and the beam side fireproof coating is installed in the beam side fireproof coating installation step. A first step of providing an insertion hole for inserting the insertion tube material in a portion of the coating covering the side of the beam, and a second step of inserting the insertion tube material into the insertion hole provided in the first step. includes, in the first step, the end portion of the insertion tube member in a state pressed against the portion covering the side of the beam in the beam-side fireproofing, in the beam-side refractory coating of the insertion tube member the semicircular hole corresponding to the upper half is formed at the end, after this, before Kihari side fireproofing, by forming a semicircular hole corresponding to the lower half at the end of the insertion tube member , The insertion hole is provided.

Refractory structure according to claim 1, and according to the construction method of the refractory structure according to claim 3, can suppress Sei Ryo increase or duct size reduction of the thickness of the holding temperature material content, suppresses the increase in the floor height At the same time, deterioration of air conditioning performance can be suppressed.
Further, according to the fireproof structure according to claim 1, since at least a part of the heat insulating material rides on the side end portion of the fireproof coating on the pipe material side, the heat insulating material is not interposed inside the beam through hole. It is possible to prevent the continuity of heat retention from being interrupted at the joint between the fireproof coating on the pipe material side and the heat insulation material, improve the heat retention performance, and easily visually confirm that the heat insulation material is properly installed. Workability is improved.
Further, according to the fireproof structure according to claim 1, since the end portion of the heat insulating material abuts on the side covering portion of the beam side fireproof coating, the heat insulation is continuous by the joint between the pipe material side fireproof coating and the heat insulating material. It is possible to further prevent the sex from being cut off, and the heat retention performance is further improved.

According to the fireproof structure according to claim 2 , since the fireproof coating on the pipe material side is a dry winding fireproof coating, the fireproof coating on the pipe material side can be applied by a simple method of cutting and pasting the fireproof coating, and the workability of the fireproof structure is improved. do.

It is a shaft sectional view of the fireproof structure which concerns on this embodiment. It is an enlarged view of the part A of FIG. FIG. 3 (a) is a table showing the results of the first fire resistance experiment, and FIG. 3 (b) is a table showing the results of the second fire resistance experiment.

Hereinafter, embodiments of the fireproof structure according to the present invention will be described in detail with reference to the accompanying drawings. First, the basic concept of the embodiment of [I] will be described, then the specific contents of the embodiment of [II] will be described, and finally, a modified example of the embodiment of [III] will be described. However, the present invention is not limited to the embodiments.

[I] Basic concept of the embodiment First, the basic concept of the embodiment will be described.
The embodiment relates to a fireproof structure. This fireproof structure is a structure that protects the structural part of a building from the spread of fire when a fire breaks out inside the building. The fireproof structure of the present embodiment is attached to the beam in order to protect the beam of the building from the spread of fire. The structure of the building is arbitrary, and the case where the building is made of steel-framed reinforced concrete will be described in the present embodiment, but a wooden structure, a steel-framed structure, a reinforced concrete structure, or the like may be used.

[II] Specific contents of the embodiment Next, the specific contents of the embodiment will be described.

(composition)
FIG. 1 is an axial cross-sectional view of the fireproof structure 1 according to the present embodiment, and FIG. 2 is an enlarged view of part A of FIG. Here, in the following, if necessary, the + XX direction in each figure is referred to as an "axial direction", particularly the + X direction is referred to as a "right direction" and the −X direction is referred to as a "left direction". Further, the + YY direction (direction orthogonal to the XZ plane; longitudinal direction of the beam 2) is referred to as "depth direction" or "front-back direction", and particularly the + Y direction (front direction in FIG. 1) is "forward direction". , -Y direction (backward direction in FIG. 1) is referred to as "rear direction". Further, the + Z-Z direction is referred to as "height direction" or "vertical direction", and particularly the + Z direction is referred to as "upward direction" and the −Z direction is referred to as "downward direction". Further, the direction of approaching the shaft of the insertion pipe material 10 and the joint pipe material 40, which will be described later, is referred to as "inward direction", and the direction away from the shaft is referred to as "outward direction". In the following, first, the configurations of the beam 2 and the fireproof structure 1 will be described.

(Structure-Beam)
The beam 2 is an H-shaped steel installed near the ceiling of each floor of the building in the present embodiment, and is arranged along the front-rear direction in FIGS. 1 and 2. Here, the beam 2 has an upper flange 3, a web 4, and a lower flange 5, and the web 4 is formed with a beam through hole 6 penetrating along the + XX direction. The beam through hole 6 may be formed in advance from the stage before the beam 2 is installed, or may be formed by using a drill or the like after the beam 2 is installed.

(Structure-Fireproof structure)
The fireproof structure 1 is a structure that protects the structural part of the building from the spread of fire. The fireproof structure 1 includes an insertion pipe material 10, a pipe material coating 20, a beam coating 30, a joint pipe material 40, a nipple 50, and a heat insulating material 60.

(Structure-Fireproof structure-Insert pipe material)
The insertion pipe material 10 is a pipe material inserted into the beam through hole 6 formed in the web 4 of the beam 2. The insertion pipe material 10 is mainly used for air conditioning. For example, air exchanged with heat by a heat exchanger (not shown) flows to an arbitrary room through the insertion pipe material 10 and the joint pipe material 40 described later. However, the application of the insertion pipe material 10 is not limited to air conditioning, and may be used as a pipe for electrical equipment through which a power supply wiring or the like is inserted, for example.

The insertion tube material 10 is a cylindrical sleeve in the present embodiment, but the shape is not limited to this. Further, the diameter of the insertion pipe material 10 is slightly smaller than the diameter of the beam through hole 6, and the pipe material coating 20 is accommodated between the outer peripheral surface of the insertion pipe material 10 and the inner peripheral surface of the beam through hole 6. Further, the axial length of the insertion pipe material 10 of the present embodiment is longer than the axial length of the upper flange 3 and the lower flange 5 of the beam 2, and is located near the axial center portion of the insertion pipe material 10. The beam through hole 6 is located. Therefore, the left and right ends of the insertion tube material 10 project in the axial direction from the left and right ends of each flange.

(Structure-Fireproof structure-Cylinder coating)
The pipe material coating 20 is a pipe material side fireproof coating attached to the outer peripheral surface of the insertion pipe material 10. The pipe material coating 20 is attached over almost the entire outer peripheral surface of the insertion pipe material 10, but strictly speaking, it is not attached to a part of the left and right ends of the insertion pipe material 10. For example, in the present embodiment, the pipe material coating 20 is not attached to a region of about 40 mm from the left and right ends of the insertion pipe material 10, and a screw 50a for connecting the insertion pipe material 10 and the nipple 50 is driven into this region. It has been. The term "pasting" is not limited to sticking with an adhesive or the like, but also includes striking the insertion tube material 10 with a screw or the like to join.

Here, the pipe material coating 20 of the present embodiment is a known dry-wrapping fireproof coating. As such a dry-wrapping fire-resistant coating, various materials that satisfy the conditions of fire-resistant performance specified by the Building Standards Act may be used, but the pipe material coating 20 of the present embodiment is outside the heat-resistant rock wool which is a fire-resistant material. It is formed by applying a non-woven fabric to the surface. Here, the thickness of the pipe material coating 20 is 25 mm in the present embodiment, but the thickness is not limited to this, and various thicknesses that satisfy the conditions of fire resistance specified by the Building Standards Act can be adopted.

As described above, in the present embodiment, since the pipe material coating 20 is also used as the heat insulating material, the heat insulating material 60 is not installed around the pipe material coating 20. Therefore, the labor and cost required for construction can be reduced. As described above, the pipe material coating 20 of the present embodiment is a dry-wound fire-resistant coating, but the present invention is not limited to this, and a wet fire-resistant coating formed by spraying a spray material containing rock wool on the outer surface of the insertion pipe material 10 is also available. I do not care.

(Structure-Fireproof structure-Beam coating)
The beam coating 30 is a beam-side fireproof coating that covers the side and the lower side of the beam 2, and is a beam-side fireproof coating in which the insertion pipe material 10 and the pipe material coating 20 are penetrated through a portion that covers the side of the beam 2. In the present embodiment, as shown in the figure, a right beam coating and a left beam coating are provided. The right beam covering is arranged so as to cover the right side and the lower side of the beam 2, and the left beam covering is arranged so as to cover the left side and the lower side of the beam 2. The two beam coverings 30 overlap each other below the beam 2. As described above, the case where the two beam coverings 30 are provided separately will be described below, but the present invention is not limited to this, and the beam covering 30 may be integrally formed or more beam coverings 30 may be provided.

Here, the portion of the left and right beam coverings 30 that covers the sides (left and right) of the beam 2 is the "side covering portion" 31 below, and the portion that covers the lower part of the beam 2 is the "lower covering portion" below. It will be referred to as 32 and will be described. The side covering portion 31 and the lower covering portion 32 may be an integral member or may be separate members. Further, a specific method for fixing the beam coating 30 at the position shown in the drawing is arbitrary, and for example, a screw may be driven into the flange or ceiling of the beam 2 to fix the beam coating 30.

Here, a covering hole 33 is formed at a position corresponding to the insertion pipe material 10 and the pipe material coating 20 in the side covering portion 31. The covering hole 33 is a hole for penetrating the insertion tube material 10 and the tube material coating 20. The inner diameter of the covering hole 33 coincides with the outer diameter of the pipe material coating 20, and the inner peripheral surface of the covering hole 33 is in contact with the outer peripheral surface of the pipe material coating 20 as shown in the drawing.

Here, the end portion (left end portion in FIG. 2) of the pipe material coating 20 projects laterally (leftward in FIG. 2) from the side covering portion 31. Therefore, the end portion of the pipe material coating 20 does not protrude laterally from the side coating portion 31 (specifically, the side coating portion 31 is brought into contact with the insertion pipe material 10 and the end portion of the beam coating 30 (specifically, the end portion of the beam coating 30). Compared with the side covering portion 31 (the configuration in which the left end portion in FIG. 2 is brought into contact with the side covering portion 31 (the right surface of the side covering portion 31 in FIG. 2)), the pipe material coating 20 can be visually recognized even after the beam coating 30 is installed. Therefore, it is possible to easily visually confirm that there is no gap between the pipe material coating 20 and the side coating portion 31 and the continuity of heat retention and fire resistance is maintained, and the workability and heat retention and fire resistance performance are improved. Can be done. Since the thickness and material of the beam coating 30 are the same as those of the pipe coating 20, detailed description thereof will be omitted.

(Structure-Fireproof structure-Coupling pipe material)
The joint pipe material 40 is a pipe material connected to the end portion of the insertion pipe material 10 along the joint direction of the insertion pipe material 10. Specifically, the joint pipe material 40 is arranged on the axial extension line of the insertion pipe material 10 as shown in the drawing, and is connected to the right end portion and the left end portion of the insertion pipe material 10. Here, the joint pipe material 40 of the present embodiment is a cylindrical pipe material having the same diameter as the insertion pipe material 10, but the joint pipe material 40 is not limited to this, and a pipe material of any shape may be adopted.

(Structure-Fireproof structure-Nipple)
The nipple 50 is a connecting means for connecting the insertion pipe material 10 and the joint pipe material 40. As shown in the drawing, the nipple 50 is arranged so as to fit inside the insertion pipe material 10 and the joint pipe material 40 at a position between the insertion pipe material 10 and the joint pipe material 40. The nipple 50 is a pipe material having a diameter one size smaller than that of the insertion pipe material 10 and the joint pipe material 40, and the outer peripheral surface of the nipple 50 is in contact with the inner peripheral surface of the insertion pipe material 10 and the joint pipe material 40. Then, as shown in the drawing, the insertion pipe material 10 and the joint pipe material 40 are attached by attaching the screw 50a penetrating from the insertion pipe material 10 to the nipple 50 and the screw 50b penetrating from the joint pipe material 40 to the nipple 50. Indirectly connected. When the diameters of the insertion pipe material 10 and the joint pipe material 40 are different, the insertion pipe material 10 and the joint pipe material 40 may be connected by using a joint (reducer) having a different diameter instead of the nipple 50.

(Structure-Fireproof structure-Heat insulation material)
The heat insulating material 60 is a heat insulating means for preventing the heat of the conditioned air flowing inside the joint pipe material 40 from escaping to the outside of the joint pipe material 40. The heat insulating material 60 is mainly wound around the outer peripheral surface of the joint pipe material 40 as shown in the drawing, and enhances the heat insulating property of the joint pipe material 40. Specifically, the heat insulating material 60 is attached so as to extend from the outer peripheral surface of the joint pipe material 40 to the side end portion of the pipe material coating 20, and a part of the heat insulating material 60 is a pipe material as shown in FIG. It rides on the side end of the coating 20. When the heat insulating material 60 rides on the pipe material coating 20 in this way, the end surface of the pipe material coating 20 on the beam 2 side (right end surface in FIG. 2) is the joint pipe material of the pipe material coating 20. Compared with the case where it is in contact with the end surface on the 40 side (the left end surface in FIG. 2), the adhesion between the pipe material coating 20 and the heat insulating material 60 is improved, and the heat retaining property can be improved. In particular, when the heat insulating material 60 does not ride on the heat insulating material 60, the heat insulating performance may deteriorate due to the gap between the heat insulating material 60 and the pipe material coating 20, but when the heat insulating material 60 rides on the heat insulating material 60, a gap is generated. This can be prevented and the heat retention performance is improved. Further, since the heat insulating material 60 is mounted on the beam 2, the end portion of the heat insulating material 60 on the beam 2 side protrudes outward by the thickness of the pipe material coating 20, and by visually recognizing the presence of this protrusion, the heat insulating material 60 Can be easily confirmed that is properly wound. Further, it is preferable that the end portion (right end portion in FIG. 2) of the heat insulating material 60 facing the beam 2 is in contact with the side covering portion 31 of the beam covering 30 as in the present embodiment. .. In this case, since the heat insulating material 60 is in contact with both the pipe material coating 20 and the beam coating 30, the heat insulating performance of the heat insulating material 60 is further improved.

(Construction method of fireproof structure)
Subsequently, the construction method of the fireproof structure 1 configured as described above will be described. An example of the construction method will be described below, but the construction procedure and the specific method are not limited to this.

First, a beam through hole 6 is formed in the beam 2 of the building. The beam through hole 6 may be formed by a drill or the like after the beam 2 is installed as described above, or the beam 2 may be installed after the beam through hole 6 is formed. The diameter of the beam through hole 6 is determined by structural calculation or the like so that the proof stress of the beam 2 can be sufficiently maintained.

Subsequently, the pipe material coating 20 is wound around the insertion pipe material 10 and fixed. The specific method of fixing is arbitrary, and an adhesive is used in the present embodiment, but the method is not limited to this, and fixing may be performed using screws or the like. When winding in this way, as described above, portions where the pipe material coating 20 is not wound are provided on the left and right ends of the insertion pipe material 10. The reason why the portion where the pipe material coating 20 is not wound is provided in this way is to prevent the pipe material coating 20 from becoming an obstacle when the screw 50a is attached as described later.

Subsequently, the insertion pipe material 10 around which the pipe material coating 20 is wound is inserted into the beam through hole 6 described above. Then, the insertion pipe material 10 is fixed to the beam 2 at a position symmetrical with respect to the web 4 of the beam 2. The specific method of this fixing is arbitrary, and for example, a known mounting member may be interposed between the pipe material coating 20 and the inner diameter of the beam through hole 6 to fix the beam, or from the upper flange 3 of the beam 2. The insertion tube material 10 may be suspended by a pole, a wire, or the like.

Subsequently, the beam covering 30 is installed. Either the right beam coating 30a or the left beam coating 30b may be installed first, but the case where the right beam coating 30a is installed first will be described below. Specifically, first, the beam coating 30 is fastened to the ceiling using the upper flange 3 or, for example, a dedicated welding pin, and the beam coating 30 is suspended from the upper flange 3. Then, a circular hole is made in the beam coating 30, and the insertion pipe material 10 is inserted into this hole. The specific method of inserting in this way is arbitrary, but an example thereof will be described below. First, in a state where the side covering portion 31 of the beam covering 30 is pressed against the left-right end portion of the insertion pipe material 10, a knife is inserted into the side covering portion 31 along the inner diameter of the upper half of the insertion pipe material 10 for insertion. The side covering portion 31 is cut out in a semicircular shape corresponding to the upper half of the pipe material 10. Next, in a state where the upper half of the insertion tube material 10 is pushed into the semicircular hole, a knife is inserted into the side covering portion 31 along the outer diameter of the lower half of the insertion tube material 10, and the insertion tube material 10 is inserted. The side covering portion 31 is cut out in a semicircular shape corresponding to the remaining lower half of 10 to form a circular hole. Finally, the remaining lower half of the insertion tube material 10 is also inserted into the beam coating 30, and the side covering portion 31 is moved to a position where it hangs vertically as shown in FIG.

As described above, in the present embodiment, the side covering portion 31 can be easily inserted by cutting the side covering portion 31 in two stages of the upper half and the lower half, and the side covering portion 31 can be easily inserted. It is possible to prevent a gap from being formed between the hole of the hole and the outer diameter of the insertion tube material 10, and it is possible to prevent deterioration of fire resistance performance. However, it is not necessary to cut the side covering portion 31 in two stages in this way, and the side covering portion 31 may be cut along the inner diameter and the outer diameter of the insertion pipe material 10 so as to be circular from the beginning. When the side covering portion 31 is cut along the inner diameter of the insertion pipe material 10, it is smaller than the diameter obtained by adding the thickness of the pipe material coating 20 to the outer diameter of the insertion pipe material 10, but the beam coating 30 itself is flexible. If it is a stretchable material, it can be inserted while widening the hole of the side covering portion 31. Alternatively, it may be cut so as to expand the hole if necessary.

After passing the insertion pipe material 10 through the hole of the side covering portion 31 of the beam covering 30 in this way, the lower part of the beam covering 30 is bent along the lower flange 5 of the beam 2 to form the lower covering portion 32, and the lower covering portion is formed. 32 is fixed to the lower flange 5.

Then, the lower covering portion 32 is fixed to the lower flange 5 of the beam 2. The installation work of the beam covering 30 is performed in the same manner on the left beam covering 30b. By fixing the lower covering portions 32 of the left and right covering portions with screws or the like in a state of being overlapped with each other, it is possible to prevent a gap between the covering portions from being formed, and the fire resistance performance can be further improved. Further, in the present embodiment, the method of separately installing the left and right beam coverings 30 of the beam 2 has been described, but the present invention is not limited to this, and the left and right beam coverings 30 may be integrally formed.

Subsequently, the nipple 50 is installed at the end of the insertion tube material 10. Specifically, the nipple 50 is inserted through the end of the insertion tube material 10, and with the nipple 50 inserted in this way, the screw 50a is driven so as to reach the nipple 50 from the insertion tube material 10, and the insertion tube material 10 and the nipple 50 To connect. At this time, since the pipe material coating 20 is not located at the left-right end portion of the insertion pipe material 10 (that is, the portion where the screw 50a is driven), the screw 50a can be preferably driven.

Subsequently, the joint pipe material 40 is connected to the end of the nipple 50. Specifically, the end portion of the joint pipe material 40 is inserted into the nipple 50, and in the state of being inserted into the nipple 50 in this way, the screw 50b is driven so as to reach the nipple 50 from the joint pipe material 40, and the joint pipe material 40 and the nipple 50 To connect.

Finally, the heat insulating material 60 is installed. Specifically, as shown in FIG. 2, the heat insulating material 60 is arranged so as to ride on the side end portion of the pipe material coating 20 from the outer peripheral surface of the joint pipe material 40, and the joint pipe material 40 or the like is used with screws or the like. It is fixed to the insertion pipe material 10. At this time, in the present embodiment, the heat insulating material 60 is only in contact with the pipe material coating 20 and the beam coating 30, and is not fixed or adhered, but is fixed or adhered using screws or the like. It may be adhered with an agent or the like.

(About examples)
In this example, an experiment was conducted in which the thickness of the coating material used for the pipe material coating 20 and the beam coating 30 was changed to obtain the fire resistance performance. As these covering materials, Makibee (registered trademark) manufactured by Nichias Corporation was used. In addition, the verification of fire resistance was carried out in accordance with Route C of the Ministry of Construction Notification No. 1433 "Fire Protection Verification Law" of 2000.

The fire resistance test was conducted in two parts. FIG. 3 (a) is a table showing the results of the first fire resistance experiment, and FIG. 3 (b) is a table showing the results of the second fire resistance experiment. First, the first fire resistance experiment was carried out. In this first fire resistance experiment, as shown in FIG. 3A, three types of beams (test body T1 (H-396 × 199 × 7 × 11) and test body T2 (H-350 × 150 × 6. A fire resistance test was carried out by wrapping a covering material around 5 × 9) and the test body T3 (H-150 × 150 × 7 × 10). At this time, the thickness of the covering material was 20 mm for the test bodies T1 and T3 and 40 mm for the test body T2. As a result, the test body T2 satisfied the pass standard value (steel frame temperature 550 ° C. or lower), and the test bodies T1 and T3 did not meet the pass standard value. In these test bodies T1 and T3, it is considered that the cause is that the coating material was too thin as 20 mm.

Subsequently, the second fire resistance experiment was carried out. In the second fire resistance test, as shown in FIG. 3 (b), in addition to the test bodies T1 and T3 that did not meet the acceptance criteria in the first fire resistance test, a new test body T4 (H-450 ×) A fire resistance experiment was also carried out by adding 250 × 12 × 19). At this time, the thickness of the covering material was changed to 25 mm for the test body T1, 40 mm for the test body T3, and 25 mm for the test body T4. As a result, although the test body T3 did not meet the pass standard value again, the test bodies T1 and T4 satisfied the pass standard value (steel frame temperature of 550 ° C. or less). As described above, although it depends on the size of the beam, it can be seen that even if the thickness of the covering material is reduced from the conventional 40 mm to 25 mm, the acceptance standard value is satisfied.

(Effect of embodiment)
As described above, according to the construction method of the fireproof structure 1 and the fireproof structure 1 of the present embodiment, the heat insulating material 60 is not interposed inside the beam through hole 6, so that the beam thickness is increased by the thickness of the heat insulating material 60. It is possible to suppress the reduction of the duct diameter and the decrease of the air conditioning performance while suppressing the increase of the floor height.

Further, since at least a part of the heat insulating material 60 rides on the side end portion of the pipe material coating 20, the pipe material coating 20 and the heat insulating material 60 are combined with each other by not interposing the heat insulating material 60 inside the beam through hole 6. It is possible to prevent the continuity of heat retention from being interrupted at the seams, improve the heat retention performance, and easily visually confirm that the heat insulation material 60 is properly installed, which improves workability.

Further, since the end portion of the heat insulating material 60 abuts on the side covering portion of the beam coating 30, it is possible to further prevent the continuity of heat retaining from being interrupted by the joint between the pipe material coating 20 and the heat insulating material 60, and the heat insulating material 60 can be further prevented from being interrupted. Performance is further improved.

Further, since the pipe material coating 20 is a dry-wound fireproof coating, the pipe material coating 20 can be applied by a simple method of cutting and pasting the fireproof coating, and the workability of the fireproof structure 1 is improved.

[III] Modifications to the Embodiment The embodiments according to the present invention have been described above, but the specific configuration and means of the present invention are within the scope of the technical idea of each invention described in the claims. Can be arbitrarily modified and improved. Hereinafter, such a modification will be described.

(About the problem to be solved and the effect of the invention)
First, the problem to be solved by the invention and the effect of the invention are not limited to the above-mentioned contents, and may differ depending on the implementation environment and the details of the configuration of the invention, and only a part of the above-mentioned problems. Or may produce only some of the effects described above.

(About dimensions and materials)
The dimensions, shape, material, ratio, etc. of each part of the fireproof structure 1 described in the detailed description of the invention and the drawings are merely examples, and other arbitrary dimensions, shapes, materials, ratios, etc. can be used.

(About heat insulating material)
In the present embodiment, the heat insulating material 60 rides on the pipe material coating 20, but the present invention is not limited to this, and the end face of the heat insulating material 60 and the end face of the pipe material coating 20 may be in contact with each other. Further, in the present embodiment, the end face of the heat insulating material 60 is in contact with the beam coating 30, but the present invention is not limited to this, and the heat insulating material 60 may not be in contact with the beam coating 30. Further, in the present embodiment, the heat insulating material 60 is not wrapped around the pipe material coating 20, but unless the heat insulating material 60 is interposed inside the beam through hole 6, for example, in a portion other than the inside of the beam through hole 6. If necessary, the heat insulating material 60 may be wrapped around the heat insulating material 60.

(About beam coating)
In the present embodiment, the side covering portion 31 of the beam covering 30 is arranged along the vertical direction, but the present invention is not limited to this, and for example, it may be arranged along the flange of the beam 2 or the web 4.

(Additional note)
The fireproof structure of Appendix 1 includes an insertion pipe material inserted into a beam through hole formed in the web of the beam, a pipe material side fireproof coating attached to the outer peripheral surface of the insertion pipe material, and lateral and downward parts of the beam. The beam-side fireproof coating that covers the side of the beam, the beam-side fireproof coating that penetrates the insertion pipe material and the pipe material side fireproof coating, and the insertion pipe material along the joint direction of the insertion pipe material. A joint pipe material connected to the end portion of the beam is provided, and a heat insulating material is not interposed inside the beam through hole.

The fireproof structure of Appendix 2 includes, in the fireproof structure of Appendix 1, a heat insulating material attached so as to extend from the outer peripheral surface of the joint pipe material to the side end of the pipe material side fireproof coating, and at least one of the heat insulating materials. The portion rides on the side end portion of the fireproof coating on the pipe material side.

In the fireproof structure of Appendix 3, in the fireproof structure according to Appendix 1 or 2, the end of the heat insulating material on the side facing the beam abuts on the portion of the beam side fireproof coating that covers the side of the beam. ..

The fireproof structure of Appendix 4 is the fireproof structure according to any one of Appendix 1 to 3, and the pipe material side fireproof coating is a dry winding fireproof coating.

The method of constructing the fireproof structure of Appendix 5 includes a step of inserting the insertion pipe material into the beam through hole formed in the web of the beam and a pipe material side fireproof coating for attaching the pipe material side fireproof coating to the outer peripheral surface of the insertion pipe material. The sticking step and the beam-side fire-resistant coating installation step in which the side and the lower side of the beam are covered with the beam-side fire-resistant coating, and the insertion pipe material and the pipe material-side fire-resistant coating are penetrated through the portion covering the side of the beam. A beam-side fireproof coating installation step and a joint pipe material connecting step for connecting the joint pipe material to the end of the insertion pipe material along the joint direction of the insertion pipe material are included, and no heat insulating material is interposed inside the beam through hole. ..

(Effect of appendix)
According to the construction method of the fireproof structure described in Appendix 1 and the fireproof structure described in Appendix 5, since the heat insulating material is not interposed inside the beam through hole, the beam thickness is increased by the thickness of the heat insulating material and the duct diameter is increased. Shrinkage can be suppressed, and while the increase in floor height can be suppressed, the deterioration of air conditioning performance can be suppressed.

According to the fireproof structure described in Appendix 2, at least a part of the heat insulating material rides on the side end of the fireproof coating on the pipe material side, so that the heat insulating material is not interposed inside the beam through hole, and the pipe material side. It is possible to prevent the continuity of heat retention from being interrupted at the joint between the fireproof coating and the heat insulating material, improve the heat retaining performance, and easily visually confirm that the heat insulating material is properly installed, improving workability. improves.

According to the fireproof structure described in Appendix 3, since the end portion of the heat insulating material abuts on the side covering portion of the beam side fireproof coating, the continuity of heat insulation is interrupted by the joint between the pipe material side fireproof coating and the heat insulating material. It is possible to further prevent dripping, and the heat retention performance is further improved.

According to the fireproof structure described in Appendix 4, since the fireproof coating on the pipe material side is a dry-wrapped fireproof coating, the fireproof coating on the pipe material side can be applied by a simple method of cutting and pasting the fireproof coating, and the workability of the fireproof structure is improved. ..

1 Fireproof structure 2 Beam 3 Upper flange 4 Web 5 Lower flange 6 Beam through hole 10 Insertion pipe material 20 Pipe material coating 30 Beam coating 30a Right beam coating 30b Left beam coating 31 Side coating part 32 Lower coating part 33 Coating hole 40 Joint pipe material 50 Nipple 50a, 50b Screw 60 Insulation material

Claims (4)

Insertion pipe material inserted into the beam through hole formed in the web of the beam,
The fireproof coating on the pipe material side attached to the outer peripheral surface of the insertion pipe material,
A beam-side fireproof coating that covers the sides and the bottom of the beam, and a beam-side fireproof coating that penetrates the insertion pipe material and the pipe material-side fireproof coating in a portion that covers the side of the beam.
A joint pipe material connected to an end portion of the insertion pipe material along the joint direction of the insertion pipe material, and a joint pipe material.
A heat insulating material attached so as to extend from the outer peripheral surface of the joint pipe material to the side end portion of the fireproof coating on the pipe material side is provided.
At least a part of the heat insulating material rides on the side end portion of the fireproof coating on the pipe material side.
The end of the heat insulating material on the side facing the beam comes into contact with the portion of the beam-side refractory coating that covers the side of the beam.
Fireproof structure. The pipe material side fireproof coating is a dry winding fireproof coating.
The fireproof structure according to claim 1. An insertion pipe material insertion step for inserting the insertion pipe material into the beam through hole formed in the web of the beam, and
The step of attaching the fireproof coating on the pipe material side and the step of attaching the fireproof coating on the pipe material side to the outer peripheral surface of the insertion pipe material.
A beam-side fire-resistant coating that covers the sides and the bottom of the beam with a beam-side fire-resistant coating. Installation steps and
A joint pipe material connecting step for connecting the joint pipe material to the end of the insertion pipe material along the joint direction of the insertion pipe material, and
Includes a heat insulating material mounting step for mounting the heat insulating material from the outer peripheral surface of the joint pipe material to the side end portion of the fireproof coating on the pipe material side.
At least a part of the heat insulating material rides on the side end portion of the fireproof coating on the pipe material side.
The end of the heat insulating material on the side facing the beam comes into contact with the portion of the beam-side refractory coating that covers the side of the beam.
Construction method of fireproof structure. The insertion tube material has a cylindrical shape and has a cylindrical shape.
In the beam-side fireproof coating installation step,
The first step of providing an insertion hole for inserting the insertion pipe material in a portion of the beam-side fireproof coating that covers the side of the beam, and
A second step of inserting the insertion tube material into the insertion hole provided in the first step is included.
In the first step,
In a state where the end portion of the insertion tube member pressed against the portion covering the side of the beam in the beam-side fireproofing, in the beam-side fireproofing, semicircular corresponding to the upper half of an end portion of the insertion tube member the hole is formed, after which, before Kihari side fireproofing, by forming a semicircular hole corresponding to the lower half at the end of the insertion tube member, providing the insertion hole,
The method for constructing a fireproof structure according to claim 3.

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