JP2010053593A - Fireproof-plate mounting structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fireproof-plate mounting structure adopted to mount a fireproof plate on the surface of a structure, such as, a tunnel and capable of increasing fireproofness while increasing working efficiency and cost benefit, when the fireproof plate is to be mounted. <P>SOLUTION: In this fireproof-plate mounting structure, the fireproof plate 3 is mounted on the surface of the structure (such as, the steel shell 1a of a steel shell tunnel), by inserting through-bolts 2 in the through-holes 3a formed in the fireproof plate 3. The through-holes 3a of the fireproof plate 3 are formed into a cylindrical shape, having a diameter at least twice or more of the diameter of the through-bolts 2, A ring-shaped fireproof blanket 8, with a predetermined thickness, is suitable for the through-bolts 2. The peripheral edge part of the fireproof blanket 8 is interposed between the structure and the fireproof plate 3. Consequently, an air insulation layer A is formed between the structure and the fireproof plate, other than the areas where the fireproof blankets 8 are disposed. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a refractory plate mounting structure applied to a case where a refractory plate is attached to the surface of a structure such as a tunnel.

  Various proposals have been made for improving the fire resistance of a structure as described above by laying a fire plate made of various refractory materials on the surface of a structure such as a tunnel, for example, the inner surface of a tunnel lining. ing. As a fireproof plate mounting structure in that case, a structure in which a bolt is inserted through a through hole provided in the fireproof plate and the fireproof plate is attached to the surface of the structure to be fireproof coated is known.

  The following Patent Document 1 shows an example of the above-mentioned fireproof plate mounting structure. A fireproof plate (fireproof panel) is arranged on the inner surface of a tunnel lining segment as a tunnel structure, and on the back side of the fireproof plate. Provided with an inorganic fiber material such as rock wool to make a heat insulation space that also serves as a heat insulation and drainage passage, and a stud bolt as a through bolt that is screwed into an insert nut embedded in the segment is provided with a stepped penetration provided in the fireproof plate A fireproof cap is screwed into the stud bolt to fix the fireproof plate, and the stepped through hole is filled with a joint material and closed.

  However, the above-mentioned conventional one is not economical because it fills the entire back surface of the refractory plate with an inorganic fiber material. Further, after the refractory cap is screwed into the stud bolt in the stepped through hole, the stepped through hole An extremely complicated and troublesome work of filling the joint material inside is required and the workability is poor. In general, when wastewater is also used with an inorganic fiber material such as rock wool, the inorganic fiber material wetted with water has a problem that the fire resistance is lowered and the original function as a fireproof material cannot be expressed.

  As a countermeasure against the above problem, for example, it is conceivable to directly attach a fireproof plate as described above to the inner surface of a structure such as a tunnel lining. FIG. 9 shows an example, and a stud bolt 2 is implanted on the inner surface of the steel shell 1a in the steel shell tunnel 1 by welding or hammering, and the stud bolt 2 is inserted into the fireproof plate 3 for inserting a bolt. The fireproof plate 3 is disposed on the inner surface of the steel shell 1a with the through hole 3a inserted and fitted, and the washer 4 is fitted to the stud bolt 2, and the nut 5 is screwed and fixed.

  In this case, if the diameter of the through-hole 3a with respect to the stud bolt 2 is small, it is difficult to align the two at the time of mounting, and it becomes difficult to mount due to a shift due to manufacturing error or thermal expansion difference. ), The diameter of the through hole 3a is formed larger than the diameter of the stud bolt 2. However, if a fire or the like occurs, the washer 4 is deformed by the heat as shown by the chain line in the figure, and a flame or heat flow penetrates into the through hole 3a from between the washer 4 and the refractory plate 3. There is a risk that fire resistance will decrease.

  Therefore, for example, as shown in FIG. 9 (b), it is conceivable to apply a refractory padding 6 in the through hole 3a. However, an operator has to put the padding 6 in a narrow space in the through hole 3a one by one. There is a problem that the work must be performed, the work is complicated and troublesome, and uneven construction is likely to occur. For example, as shown in FIG. 10 (a), it is conceivable to provide a fireproof packing 7 on the side of the fireproof plate 3 of the washer 4. However, when a fire or the like occurs, the heat is the same as in FIG. 9 (a). The washer 4 is deformed, and the fireproof packing 7 is also deformed accordingly, and there is a problem that the fireproof performance deteriorates due to a flame or heat flow entering the through hole 3a from between the fireproof packing 7 and the fireproof plate 3. .

Japanese Patent No. 2001-311395

  The present invention has been proposed in view of the above-described problems, and provides a fireproof plate mounting structure capable of improving fireproof performance while improving workability and economic efficiency when attaching a fireproof plate. With the goal.

  In order to achieve the above object, the fireproof plate mounting structure according to the present invention has the following configuration. That is, a fireproof plate mounting structure in which a bolt is inserted through a through hole provided in the fireproof plate to attach the fireproof plate to the surface of the structure to be fireproof coated, and the through hole of the fireproof plate is inserted into the through hole. It is formed in a cylindrical shape having a diameter of at least twice the diameter of the bolt, and a ring-shaped fire-resistant blanket having a predetermined thickness is fitted to the through-bolt, and the peripheral portion of the fire-resistant blanket is connected to the structure and the fire-resistant plate. And an air heat insulating layer is formed between the structure and the fireproof plate other than the arrangement position of the fireproof blanket.

According to the fireproof plate mounting structure of the present invention configured as described above, the following effects can be obtained.
1) Since the through hole for inserting the bolt provided in the fireproof plate is formed in a cylindrical shape having a diameter at least twice the diameter of the through bolt, alignment of the through bolt and the through hole is facilitated. Therefore, it is possible to prevent the mounting from being difficult due to a deviation due to a manufacturing error or a difference in thermal expansion.
2) A ring-shaped fire-resistant blanket having a predetermined thickness is fitted to the through-bolt, and the through-hole for inserting the through-bolt is formed by interposing the peripheral portion of the fire-resistant blanket between the structure and the fire-resistant plate. It is possible to improve the fire resistance by preventing the flame and heat flow from entering from the hole to the back side of the fire plate.
3) In particular, since the flame or heat flow is blocked by the fireproof blanket at the base (base) of the through bolt for attaching the fireproof plate to the structure, the flame or heat flow is between the structure and the fireproof plate. It is possible to prevent the fire resistance from deteriorating due to entering.
4) By further interposing the fireproof blanket between the structure and the fireproof plate and forming an air heat insulating layer therebetween, the heat insulating effect is further improved by the air heat insulating layer combined with the heat insulating effect of the fireproof plate. Can do. In particular, the air heat insulating layer has a higher heat insulating effect than the case where an inorganic fiber material such as rock wool is filled between the structure and the fireproof plate as in the conventional example.
5) In general, the surface of the structure is often uneven, and the above-mentioned buffering or absorbing function against the unevenness can be provided by floating the fireproof plate by the thickness of the fireproof blanket from the surface of the structure. .
6) The buffering or absorbing function against unevenness makes it easy to align and joint the adjacent refractory plates, so that the surface can be finished cleanly. Moreover, since it can prevent that a level | step difference and a clearance gap produce in an adjacent fireproof board, fireproof performance can be improved.
7) In the above-described conventional example, filling materials such as joint materials are filled in the through holes for inserting bolts, and there is a possibility that the construction may vary due to individual differences in the filling method. Since a ring-shaped fireproof blanket with a thickness is used, there is no variation in construction, and the through hole can be easily and reliably closed.
8) Since the through hole for inserting the bolt does not have to be stepped as in the conventional example, the processing cost is low and economical, and it is easy to position the through hole at the mounting position. Because there is, construction is easy.

  Hereinafter, the fireproof plate mounting structure according to the present invention will be specifically described based on an embodiment shown in the drawings. 1 is a cross-sectional view of a steel shell tunnel to which the present invention is applied, FIG. 2 (a) is an enlarged view of a part of FIG. 1, FIG. 2 (b) is a side view thereof, and FIG. FIG. 3A and FIG. 3B are enlarged views of a part of FIG. 2A and FIG. 2B, respectively, and FIG. 3C is a CC sectional view in FIG. FIG. 4 is an enlarged view of a part of FIG. Based on these drawings, members having the same functions as those of the conventional example will be described with the same reference numerals.

  This embodiment is applied to a steel shell tunnel 1 as shown in FIG. 1 as a structure to which the fire plate 3 is attached. The steel shell tunnel 1 is formed of steel shells 1 a. A tunnel structure is configured by filling concrete 1c between 1b. A stud bolt 2 as a through bolt is planted at a predetermined position on the inner surface of the steel shell 1a of the steel shell tunnel 1 by stud welding or hammering, and the stud bolt 2 is inserted into the fireproof plate 3 by bolt insertion. Inserted into the common through-hole 3a, fitted the washer 4 to the stud bolt 2, screwed the nut 5 to attach the fireproof plate 3 to the inner surface of the steel shell 1a, and the predetermined thickness fitted to the stud bolt 2 A ring-shaped refractory blanket 8 is interposed between the steel shell 1a and the refractory plate 3, and an air insulation layer A is provided between the steel shell 1a and the refractory plate 3 other than the position where the refractory blanket 8 is disposed. Formed.

  Although the material of the said refractory board 3 is appropriate, for example, calcium silicate or ceramic can be used. In the present embodiment, a calcium silicate fireproof plate is used. The size and thickness of the refractory plate 3 are also appropriate, but in the present embodiment, a rectangular shape having a length of 100 cm and a width of 150 cm and a thickness of 27 mm is arranged in a horizontally long manner. The bolt insertion through hole 3a formed in the refractory plate 3 is formed in a cylindrical shape having a diameter at least about twice the diameter of the stud bolt 2 as the through bolt. In the present embodiment, the stud The diameter (diameter) of the bolt 2 is 12 mm, and the diameter (diameter) of the through hole 3a is 30 mm. As described above, the diameter of the through-hole 3a is at least twice the diameter of the through-bolt (stud bolt 2). If the diameter is less than twice, the through-bolt and the through-hole 3a are aligned. This is because it may be difficult to install due to deviation due to manufacturing errors or stud construction errors.

  The material of the refractory blanket 8 is appropriate, but for example, a ceramic blanket or ceramic paper can be used. The shape of the refractory blanket 8 is also appropriate. Usually, it may be formed in a ring shape having a through hole 8a for the stud bolt 2 in the center as shown in FIG. In that case, the diameter of the insertion hole 8a is such that when the refractory blanket 8 is fitted to the stud bolt 2, the inner surface of the insertion hole 8a is in close contact with the outer peripheral surface of the base 2a of the stud bolt 2 as shown in FIG. The outer diameter of the refractory blanket 8 is preferably larger than the diameter of the through hole 3a of the refractory plate 3 by about 5 to 15 mm. Further, the thickness of the refractory blanket 8 may be set as appropriate in consideration of the thickness of the air heat insulation layer A formed between the steel shell 1a and the refractory plate 3 thereby. The thickness is preferably in the range of 5 to 15 mm. This is because if the thickness of the air heat insulation layer A is too thin, the heat insulation effect is small, and if it is too thick, there is a problem that the air space is bulky and the internal space becomes narrow, for example, in a tunnel.

  In said structure, when attaching the fireproof board 3 to the inner surface of the steel shell tunnel 1 as a structure, what is necessary is just to construct in the following ways, for example. First, the stud bolt 2 as a through bolt is welded to the inner surface of the steel shell 1a of the steel shell tunnel 1 to which the fireproof plate 3 is to be attached, corresponding to the through hole 3a for bolt insertion formed in the fireproof plate 3. Planted by hammering. The stud bolts 2 may be planted for each refractory plate 3 or the stud bolts 2 for a large number of refractory plates 3 may be continuously formed simultaneously. Next, after fitting the fire-resistant blanket 8 to the base of the stud bolt 2, the through-hole 3a of the fire-resistant plate 3 is inserted and fitted into the stud bolt 2, and the washer 4 is fitted into the stud bolt 2, and the nut 5 is fitted. By screwing, the refractory plate 3 is attached to the inner surface of the steel shell 1a at a predetermined interval. Thereby, an air heat insulation layer A is formed between the steel shell 1a and the refractory plate 3.

  As described above, in the fireproof plate mounting structure according to the present invention, the through hole 3a for inserting the bolt provided in the fireproof plate 3 is formed in a cylindrical shape having a diameter at least about twice the diameter of the stud bolt 2 as a through bolt. As a result, the positioning of the stud bolt 2 and the through hole 3a is facilitated, and it is possible to prevent the mounting from being difficult due to a deviation due to a manufacturing error or a stud construction error. Further, by fitting a ring-shaped fire-resistant blanket 8 having a predetermined thickness to the bolt 2 and interposing the peripheral portion of the fire-resistant blanket 8 between the steel shell 1a as the structure and the fire-resistant plate 3, It is possible to improve the fire resistance by preventing intrusion of flame and heat flow from the through hole 3a to the back side of the fireproof plate 3. Particularly, since the flame or heat flow is blocked by the fireproof blanket 8 at the base of the bolt 2 for attaching the fireproof plate 3 to the steel shell 1a, a flame or heat flow enters between the steel shell 1a and the fireproof plate 3. Therefore, it is possible to prevent the fire resistance from deteriorating.

  Further, the fireproof blanket 8 is interposed between the steel shell 1a and the fireproof plate 3, and the air heat insulation layer A is formed between the steel shell 1a and the fireproof plate 3. The effect can be further improved. In particular, the air insulating layer A as described above has a higher heat insulating effect than the case where the heat insulating space is filled with an inorganic fiber material such as rock wool. I can protect it. In general, the surface of the structure as described above often has unevenness, but the refractory plate 3 is lifted from the surface of the structure by the thickness of the refractory blanket 8 to absorb or absorb the unevenness. It can have a function. Further, the buffering or absorbing function facilitates the positioning and jointing of the adjacent refractory plates 3, and the surface of the adjacent refractory plates 3 can be finished flat and clean without any step or gap. Moreover, since it can prevent intrusion of a flame, a heat flow, etc. between the adjacent fireproof plates 3 and 3, fireproof performance can be improved significantly.

  In the above embodiment, a normal hexagon nut is used as the nut 5 for fixing the fireproof plate 3 to the stud bolt 2. However, for example, a cap nut 51 as shown in FIG. 6 may be used. When such a cap nut 51 is used, the fireproof plate 3 can be satisfactorily fixed even if the stud bolt 2 is short, and the tip end of the stud bolt 2 protrudes from the nut as shown in FIG. It is possible to prevent damage from being hit by other objects.

  Moreover, although the said embodiment demonstrated as an example the case where it applied to the steel shell tunnel 1 as a structure, it is applicable also to the shield tunnel 10 etc. which used the segment 10a for tunnel lining as shown, for example in FIG. In this case, for example, as shown in FIG. 8, the fireproof plate 3 can be attached using an insert nut 11 embedded in the tunnel lining segment 10a in advance. FIG. 7 shows a configuration in which the refractory plate 3 is attached to almost the entire inner surface of the segment 10a excluding the invert portion 10b at the bottom of the tunnel, and FIG. 8 shows that a headed bolt 12 is screwed into the insert nut 11 as a through bolt. The fireproof plates 3 are attached to the inner surface of the tunnel lining segment 10. A ring-shaped refractory blanket 8 similar to the above is inserted and held in the base of the headed bolt 12, and the refractory blanket 8 is interposed between the segment 10 and the refractory plate 3, thereby providing the refractory blanket 8. An air heat insulating layer A is formed between the segment 10 excluding the arrangement position of the blanket 8 and the refractory plate 3. Other configurations are the same as those of the above-described embodiment, and the same operational effects can be obtained.

  In addition to the above, the present invention can be applied to the surface (inner surface or outer surface) of various structures such as tunnels, tunnels formed by placing concrete, underground passages other than tunnels, structures such as bridges, buildings, etc. This can also be applied to the case where a fireproof plate is attached to the bracket. The means for attaching the fireproof plate to the structure as described above is not limited to the stud bolt 2 and the insert nut 11 as described above. For example, various anchors or anchor bolts may be used, and at least the fireproof plate is penetrated. As long as it is attached to the structure using through bolts, it can be applied to various configurations.

  As described above, since the fireproof plate mounting structure according to the present invention has the above-described structure, the fireproof performance is good after improving workability and economy when attaching the fireproof plate to the surface of a structure such as a tunnel. It is possible to provide a fireproof plate mounting structure easily and inexpensively, and is effective and appropriate as a mounting structure when attaching a fireproof plate to the surface of various structures. Can do.

The cross-sectional view of the steel shell tunnel to which the present invention is applied. (A) is a partially enlarged view of FIG. 1, (b) is a side view thereof, and (c) is a cross-sectional view taken along line cc in (b). FIGS. 2A and 2B are enlarged views of a part of FIGS. 2A and 2B, and FIG. 2C is a cross-sectional view taken along line cc in FIG. FIG. 4 is an enlarged view of a part of FIG. The exploded perspective view of the fireproof board attachment part of the said embodiment. The cross-sectional top view of the example which uses the cap nut as a nut for fireproof board fixation. The cross-sectional view of the other tunnel to which this invention is applied. The cross-sectional top view of a fireproof board attaching part. (A) is a cross-sectional view which shows an example of a fireproof board attachment part, (b) is the same as the above figure which shows another example. (A) is a cross-sectional view showing still another example of the refractory plate mounting portion, and (b) is the same as above in a state where the washer is deformed by a fire.

Explanation of symbols

1 Steel shell tunnel 1a, 1b Steel shell 1c Concrete 2 Stud bolt (through bolt)
3 Fireproof plate 3a Through hole 4 Washer 5 Nut 6 Filling 7 Fireproof packing 8 Fireproof blanket 10 Shield tunnel 10a Tunnel lining segment 11 Insert nut 12 Head bolt (through bolt)
A Air insulation layer

Claims (2)

A fireproof plate mounting structure in which a bolt is inserted through a through hole provided in the fireproof plate and the fireproof plate is attached to the surface of the structure to be fireproof coated,
The through-hole of the refractory plate is formed in a cylindrical shape having a diameter at least twice the diameter of the through-bolt, and a ring-shaped fire-resistant blanket having a predetermined thickness is fitted to the through-bolt, and the refractory blanket A fireproof plate mounting characterized in that an air heat insulating layer is formed between the structure and the fireproof plate other than the position where the fireproof blanket is disposed, with a peripheral edge portion interposed between the structure and the fireproof plate. Construction.   The fireproof plate mounting structure according to claim 1, wherein the thickness of the air heat insulating layer is within a range of 5 to 15 mm.

Images