JP5141592B2 - Refractory coating structure in the pipe insertion part of the beam - Google Patents

Description

  The present invention relates to a fireproof covering structure in a pipe insertion portion of a beam made of H-shaped steel.

  In general, in a fire-resistant building having a steel structure, a fire-resistant coating treatment is applied to a main structural material in order to prevent a decrease in yield strength accompanying a temperature increase of the structural material at the time of a fire. As this kind of fireproof coating treatment, a method of winding a fireproof coating material around a main structural material is known.

  7 and 8 show an example of a fireproof covering structure in a beam made of H-section steel. In the structure shown in FIG. 7, the fireproof coating 5 is wound around the upper and lower flanges 2 and 3 and the web 4 of the beam 1, and in the structure shown in FIG. 8, a gap is formed with respect to the web 4 of the beam 1. Thus, the fireproof covering material 5 is wound.

  In the case of the structure shown in FIG. 7, in the pipe insertion portion for inserting the pipe into the insertion hole formed in the web 4 of the beam 1, as shown in FIG. 9, the insertion hole of the beam 1 with respect to the fireproof covering material 5. Through holes 7 and 7 corresponding to 6 are formed, and the pipe 8 is inserted into the insertion hole 6 while passing through the through holes 7 and 7. Further, in place of the through holes 7 and 7, a cut is formed in the fireproof covering material 5.

  In the case of the structure shown in FIG. 8, in the pipe insertion part for inserting the pipe into the insertion hole formed in the web 4 of the beam 1, as shown in FIG. 10, the insertion hole 6 of the beam 1 with respect to the fireproof covering 5 is provided. Corresponding through-holes 7 and 7 are formed, and a tube material 9 around which a refractory material 9 a is wound is inserted into the through-holes 7 and 7 and the insertion hole 6, thereby closing a gap between the web 4 and the refractory coating material 5. Thus, the pipe 8 is inserted through the pipe 9 around which the refractory material 9a is wound. Further, in place of the through holes 7 and 7, a cut is formed in the fireproof covering material 5.

  Such a fireproof covering structure in a pipe insertion portion of a beam made of H-shaped steel is disclosed in Patent Document 1, for example.

JP 2005-179904 A

  In the structure shown in FIG. 9 and FIG. 10 described above, if there is a gap between the fireproof covering material 5 and the pipe 8 or the pipe material 9 penetrating the through-holes 7 and 7, the beam 1 is exposed to heat. It is necessary to form the through-holes 7 and 7 in the fireproof covering material 5 with high accuracy in accordance with the pipe diameter and the pipe material diameter. There was a problem that became very bad. In addition, since the fireproof covering material 5 is to be wound around the beam 1, when the through-holes 7 and 7 are formed in advance in a factory or the like, misalignment is likely to occur with respect to the insertion hole 6 of the beam 1 during winding. For this reason, the drilling of the through holes 7, 7 is usually performed on site.

  In addition, when a cut is formed in the fireproof coating material 5 instead of the through holes 7, 7, it is possible to eliminate the need for highly accurate drilling work on site, but the piping 8 and the pipe material 9 As the periphery of the cut of the fireproof coating material 5 is rolled up or peeled off during insertion, a gap is created between the fireproof coating material 5 and the pipe 8 or pipe material 9 penetrating through the through holes 7, 7. Since the web 4 of 1 is exposed, it is necessary to perform repair work to shield the exposed part after pipe insertion. Especially when there are many repair points, forgetting repair or spending a lot of time on repair work. There was a problem that forced to extend the construction period.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a fireproof covering structure in a pipe insertion portion of a beam that solves the above-described problems, has excellent workability on site, and can eliminate the need for repair work after the pipe insertion.

  In order to solve the above-mentioned problems, the fireproof covering structure in the pipe insertion portion of the beam according to the present invention is configured such that the web 12 is sandwiched from both sides around the pipe insertion hole 13 formed in the web 12 of the beam 10 made of H-shaped steel. A pair of fireproof fillers 15 and 15 made of rock wool, for example, are attached, and the pipe insertion hole 13 of the web 12 and the through holes 17 and 17 formed in the pair of fireproof fillers 15 and 15 are overlapped with each other. The fireproof covering material 20 made of, for example, rock wool wound around the beam 10 so as to enclose the pair of fireproof filler materials 15 and 15 is opposed to the through holes 17 and 17 of the pair of fireproof filler materials 15 and 15, respectively. A pair of cuts 21 and 21 are formed, and a pipe 30 inserted from one cut 21 is inserted through the pipe insertion hole 13 and the through holes 17 and 17. It is characterized in that extracted from the other notch 21.

  Further, the through holes 17 and 17 of the pair of refractory fillers 15 and 15 have a smaller diameter than the pipe insertion hole 13 so that the pair of refractory fillers 15 and 15 surround the through holes 17 and 17. Cut lines 18 and 18 having substantially the same diameter as the pipe insertion hole 13 are formed.

  Further, the pair of refractory fillers 15, 15 is press-fitted between the upper and lower flanges 11, 11 of the beam 10, and is surrounded by the upper and lower flanges 11, 11 of the beam 10 and the web 12. It is attached so as to fit in the part.

  Further, the fireproof covering material 20 is disposed along the outer surfaces 16 and 16 opposite to the side of the pair of fireproof fillers 15 and 15 that are in contact with the web 12 of the beam 10 and the lower surface of the lower flange 11 of the beam 10. Winding while letting.

  In the fireproof coating structure in the pipe insertion part of the beam of the present invention, since the notch is formed in the fireproof coating material and the pipe is inserted, high-precision drilling work in the field for the fireproof coating material is unnecessary, Workability can be improved. Moreover, since the fireproof filler is provided so that the beam web is sandwiched inside the fireproof coating material even if the periphery of the cutout of the fireproof coating material is rolled up or peeled off when the pipe is inserted, the beam web is provided. Exposure can be prevented, and troublesome repair work after pipe insertion can be eliminated.

  In addition, in the fireproof filler, a cut line with the same diameter as the pipe insertion hole is formed so as to surround the through hole having a smaller diameter than the pipe insertion hole, and the inner part of the fireproof filler can be cut by pushing the pipe. By doing so, it is possible to flexibly cope with the insertion of pipes having different diameters, and it is possible to improve workability.

  Furthermore, by attaching the pair of refractory fillers by press-fitting between the upper and lower flanges of the beam, the attachment work of the refractory coating can be easily performed, and the workability is further improved.

  Furthermore, by attaching a pair of refractory fillers so that they fit in a substantially U-shaped part surrounded by the upper and lower flanges of the beam and the web, the refractory filler does not get in the way when wrapping the refractory coating. The property is further improved.

  In addition, by winding the fire-resistant coating material along the outer surface of the pair of fire-resistant filler materials and the lower surface of the lower flange of the beam, the gap between the fire-resistant coating material and the fire-resistant filler material is reduced. It is possible to suppress the inflow of heat when the periphery of the notch of the covering material is rolled up or peeled off, and to maintain good fire resistance.

  Furthermore, by using rock wool of the same material as the fireproof filler and fireproof covering material, construction costs can be reduced by sharing the material.

It is sectional drawing which showed the fireproof coating structure in the piping penetration part of the beam which concerns on one Embodiment of this invention. It is the perspective view which showed the state before attachment of a refractory filler. It is the perspective view which showed the attachment state of the fireproof covering material. It is the perspective view which showed the penetration state of piping. It is the perspective view which showed the penetration state of piping. It is sectional drawing which showed the insertion state of large diameter piping. It is sectional drawing which showed the fireproof coating structure of the conventional beam. It is sectional drawing which showed another conventional fireproof covering structure. It is sectional drawing which showed the fireproof covering structure in the piping insertion part of the conventional beam. It is sectional drawing which showed the fireproof covering structure in the piping penetration part of another conventional beam.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows a fireproof covering structure according to an embodiment of the present invention. In FIG. 1, 10 is a beam made of H-shaped steel. The beam 10 has a structure in which the center portions of the upper and lower flanges 11 and 11 are connected by a web 12. A substantially circular pipe insertion hole 13 having a diameter of, for example, about 125 mm is formed in the longitudinal center portion of the web 12. Is formed. Reference numeral 14 denotes a concrete floor panel installed on the upper flange 11 of the beam 10.

  15 and 15 are refractory fillers. As shown in FIG. 2, these refractory fillers 15 and 15 have flexibility formed by, for example, forming rock wool into a substantially rectangular parallelepiped shape, and have a longitudinal length of about 240 mm and a lateral length. Is about 240 mm, and the thickness is about 60 mm. Further, the refractory filler 15 has a substantially circular through-hole 17 having a smaller diameter than the pipe insertion hole 13 of the beam 10, for example, a diameter of about 80 mm, so as to penetrate between the center portions of the side surfaces 16, 16. It is formed in the direction. Furthermore, a substantially circular cut line 18 having the same diameter as the pipe insertion hole 13 of the beam 10 is formed so as to surround the through hole 17. The cut line 18 is formed by arranging cuts penetrating between the side surfaces 16 and 16 of the refractory filler 15 around the through holes 17 with appropriate intervals in the circumferential direction. The through hole 17 and the cut line 18 of the refractory filler 15 are formed in advance in a factory or the like.

  The refractory fillers 15 and 15 are configured such that the through holes 17 and 17 are overlapped with the pipe insertion holes 13 of the beam 10 so that the web 12 is sandwiched from both sides around the pipe insertion holes 13 of the beam 10. Attached. Specifically, the refractory fillers 15 and 15 are press-fitted between the upper and lower flanges 11 and 11 of the beam 10 and fit in a U-shaped portion surrounded by the upper and lower flanges 11 and 11 of the beam 10 and the web 12. It is attached as follows. As described above, the fireproof fillers 15 and 15 are simply attached by being fitted into the beam 10 without using an adhesive or the like.

  Reference numeral 20 denotes a fireproof coating material. The fireproof covering material 20 has flexibility formed by molding rock wool into a mat shape, for example, and as shown in FIG. It is wound in a letter shape. Specifically, the refractory fillers 15 and 15 are wound around the outer surface 16 opposite to the side of the beam 10 in contact with the web 12 and the lower surface of the lower flange 11 of the beam 10. The fireproof coating material 20 is fixed by inserting a metal fixing pin from the outside of the fireproof coating material 20 and stud welding the fixing pin to the end of the upper flange 11 of the beam 10. Instead, the upper end of the fireproof covering material 20 may be fixed to the floor panel 14 by screws.

  The fireproof covering 20 is formed with a pair of cross-shaped cuts 21 and 21 that face the through holes 17 and 17 of the fireproof fillers 15 and 15, respectively. The cut width is about 100 mm both vertically and horizontally. The notches 21 and 21 of the fireproof covering material 20 are formed corresponding to the through holes 17 and 17 of the fireproof filler materials 15 and 15 after the fireproof covering material 20 is wound around the beam 10 and fixed. Moreover, the shape of the notches 21 and 21 is not restricted to a cross shape, and can be changed suitably.

  30 is a pipe used for water supply / drainage, ventilation, wiring insertion, and the like. As shown in FIGS. 4 and 5, the pipe 30 is inserted from one notch 21 formed in the fireproof coating material 20, and the pipe insertion hole 13 formed in the web 12 of the beam 10 and a pair of fireproof fillers. 15 and 15 are inserted through the through holes 17 and 17 and are extracted from the other cut 21. When the outer diameter of the pipe 30 is slightly larger than the through holes 17 and 17 of the refractory fillers 15 and 15, as shown in FIG. 1, the refractory fillers 15 and 15 are inserted while being slightly compressed. When the outer diameter of the pipe 30 is approximately the same diameter as the cut lines 18 and 18 of the refractory fillers 15 and 15, that is, approximately the same diameter as the pipe insertion hole 13 of the beam 10, as shown in FIG. Is inserted while cutting away the inner portions of the refractory fillers 15 and 15 from the cut lines 18 and 18 so that no gap is formed between the pipe 30 and the refractory fillers 15 and 15. . Therefore, the pipes 30 having different diameters can be inserted. As shown in FIG. 6, the cut-off portion 19 of the refractory fillers 15 and 15 stays compressed inside the refractory coating material 20 and is not discharged as a remaining material. When the periphery of the cuts 21, 21 of the fireproof coating material 20 is rolled up and protrudes outward by the insertion of the pipe 30, it is desirable to insert the rolled-up portion inside the fireproof coating material 20. .

  As a construction procedure of the above fireproof covering structure, first, the fireproof fillers 15 and 15 are attached to the beam 10, and the fireproof covering material 20 is wrapped around the beam 10 so as to wrap the fireproof fillers 15 and 15. After the notches 21 and 21 are formed, the pipe 30 is inserted.

  In the above-mentioned fireproof coating structure, since the cuts 21 and 21 are formed in the fireproof coating material 20 and the pipe 30 is inserted, high-precision drilling work on the fireproof coating material 20 is not necessary, and workability is improved. Can be improved. Moreover, even if the notches 21 and 21 around the fireproof covering 20 are rolled up or peeled off when the pipe is inserted, the fireproof fillers 15 and 15 are sandwiched between the fireproof coverings 20 so as to sandwich the web 12 of the beam 10. Since the web 12 of the beam 10 can be prevented from being exposed, troublesome repair work after the piping is inserted can be eliminated.

  The present invention is not limited to the above embodiment, and it is needless to say that many modifications and changes can be made to the above embodiment within the scope of the present invention.

10 .... Beam, 11 .... Flange, 12 .... Web, 13 .... Pipe insertion hole, 15 .... Fireproof filler, 16 .... Outer side, 17 .... Through hole, 18 .... Tear-off wire, 20 .... Fire resistance Covering material, 21 ... cut, 30 ... piping

Claims (6)

  A pair of refractory fillers (15) and (15) is provided around the pipe insertion hole (13) formed in the web (12) of the beam (10) made of H-shaped steel so as to sandwich the web (12) from both sides. The pipe insertion hole (13) of the web (12) and the through holes (17) and (17) formed in the pair of refractory fillers (15) and (15), respectively, are overlapped with each other, and the pair of refractory fires are attached. The through-holes (17) and (17) of the pair of refractory fillers (15) and (15) are formed in the refractory covering material (20) wound around the beam (10) so as to enclose the filler (15) and (15). A pair of cuts (21) and (21) facing each other are formed, and the pipe (30) inserted from one of the cuts (21) is connected to the pipe insertion hole (13) and the through holes (17) and (17). Through the other notch (21). Fireproof covering structure in the pipe insertion portion of the beam, characterized in that out has.   The through holes (17), (17) of the pair of refractory fillers (15), (15) have a smaller diameter than the pipe insertion hole (13), and the pair of refractory fillers (15), (15) The fireproof covering structure in the pipe insertion part of the beam according to claim 1, wherein a cut line (18) (18) having substantially the same diameter as the pipe insertion hole (13) is formed so as to surround the through hole (17) (17).   The fireproof covering structure in the pipe insertion portion of the beam according to claim 1 or 2, wherein the pair of fireproof fillers (15) (15) are press-fitted across the upper and lower flanges (11) (11) of the beam (10). .   The pair of refractory fillers (15) and (15) are attached so as to fit in a substantially U-shaped portion surrounded by upper and lower flanges (11) and (11) and a web (12) of the beam (10). The fireproof covering structure in the piping insertion part of the beam in any one of 1 thru | or 3.   The fireproof covering material (20) is formed on the outer surface (16) (16) opposite to the side of the pair of fireproof fillers (15) (15) that is in contact with the web (12) of the beam (10). The fireproof covering structure in the pipe insertion part of the beam according to any one of claims 1 to 4, which is wound along the lower surface of the lower flange (11) of the beam (10).   The fireproof covering structure in the pipe insertion portion of the beam according to any one of claims 1 to 5, wherein the pair of fireproof fillers (15) and (15) and the fireproof covering material (20) are made of rock wool.