JP2003269097A - Board and fireproof structure including the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fireproof board which is to be laminated for attachment on a steel plate for forming an interior wall of a steel shell immersed tunnel, etc., prevents a decrease in force for jointing with the steel plate even under a high-temperature state, makes it harder for heat to be transferred to the steel plate, has excellent fire resistance efficiency, and allows the rapid and easy performance of execution work. <P>SOLUTION: This board 1 has a plate-shaped main body part 2 which is composed of a noncombustible material such as calcium silicate and a plurality of through-holes 3 in which a part of an inner surface is formed of a welded part 4 serving as a cylindrical member made of weldable metal. The board 1 is fixed to the steel plate 5 via a welding material 7. The through-holes 3 of the board 1 are filled with a filler 6 which is composed of the noncombustible material. The welded part 4 is preferably formed within an area ranging from an end, on the side of the steel plate 5, of the board 1 to a part with two-fourths thickness of the board 1 or less. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a board suitable for being laminated on a steel plate for fireproofing on an inner wall surface of a submerged tunnel or the like, and a fireproof structure using the board.

[0002]

2. Description of the Related Art In the field of civil engineering and construction, as a method for imparting fire resistance when constructing a building having a wall portion having fire resistance, for example, a method of attaching a fire resistant board to the wall portion, a lock. A method of spraying a refractory material such as wool or a refractory mortar, a method of applying a refractory paint, and the like are performed.

[0003]

When constructing a tunnel, a steel plate may be used as a material for forming the inner wall because of the advantages of the construction structure. However, if a fire occurs in a submerged tunnel that uses steel plates as the material for the inner wall (steel shell submerged tunnel or steel or ductile segment tunnel with exposed iron on the inner wall), the tunnel is a closed space. Therefore, it is assumed that the heat does not escape to the external space, the temperature inside the tunnel becomes extremely high, the strength of the steel plate forming the inner wall decreases, and the collapse or the like occurs inside the tunnel. Therefore, it is necessary to take measures such as forming a fireproof coating layer on the surface of the steel sheet forming the inner wall. Here, when a means for imparting fire resistance to the inner wall surface of a tunnel, such as a submerged tunnel where the iron portion is exposed on the inner surface, is examined, the conventional method has various disadvantages as described below. First, when the method of spraying the refractory material on the surface of the steel sheet is adopted, there is a problem that the surface finish is inferior to that of the refractory board. Further, when the method of applying the fireproof paint to the surface of the steel sheet is adopted, there is a problem that the fireproof performance is inferior to the method of spraying the fireproof material on the inner wall surface of the tunnel or the method of attaching the fireproof board.

When a method of sticking a refractory board to the surface of a steel plate is adopted, a method of using an epoxy-based adhesive or the like and a method of using a metal anchor (fixing tool) can be considered.
Of these, when using an epoxy-based adhesive, in addition to the problem of durability of the adhesive strength, the adhesive softens or burns due to high temperature during a fire, and the entire fireproof board falls off from the steel plate. there is a possibility. When a metal anchor is used, heat may be transferred to the steel plate by the anchor and the strength of the steel plate may be reduced. That is, the metal anchor may become a weak point in the fireproof performance of the fireproof board. Further, when a metal anchor is used, there is a problem that a lot of labor and time are required for the work of attaching the anchor, including the work of thread cutting for forming a female screw on a steel plate. In particular, since the wall surface of the submerged tunnel is vast, it would be inevitable that if metal anchors were used for the work, a longer construction period and higher construction costs would be unavoidable. It

As described above, the refractory board is excellent in surface finish and fire resistance of the main body of the board, but when an adhesive is used to bond it to the steel plate, problems such as adhesive strength at high temperature occur. In addition, when a metal anchor (fixing tool) is used for joining the steel plate, there is a problem that the anchor becomes a weak point in fire resistance. Therefore, the present invention is a board suitable for being stacked and attached to a steel sheet forming an inner wall in a steel shell burial tunnel, etc., and the joining force with the steel sheet does not decrease even under high temperature, and It is an object of the present invention to provide a board that does not easily transmit heat, has excellent fire resistance, and can perform construction work quickly and easily.

[0006]

Means for Solving the Problems As a result of intensive studies for solving the above-mentioned problems, the present inventor has provided a plurality of through holes in the thickness direction of a board, and extends over an appropriate region of the inner surface of the through holes. The present invention has been completed based on the idea that the above problems can be solved by forming a welded portion for facilitating welding with a steel plate that is an object to which a board is attached. That is, the board of the present invention (claim 1) is
A board for laminating and mounting on a steel plate (for example, a board mainly composed of calcium silicate or other conventional refractory board), wherein a plurality of through holes are provided in the thickness direction of the board. It is characterized in that the through hole is at least partially formed by a welded portion capable of being welded to the steel plate. Thus, by forming the through hole at least partially in the welded part, the mounting work of the board can be quickly performed only by welding from the front side, and the metal anchor having many exposed surfaces to the external space. Compared with, the heat transfer to the steel plate at the time of fire can be significantly suppressed.

As an example of a preferred embodiment of the board, the board has a thickness of 20 to 80 mm, and the welded portion is 3/4 or less of the thickness of the board from the end of the through hole on the steel plate side. One that is formed over the (particularly preferably 2/3 or less) portion is mentioned (claim 2). In this way, by limiting the place where the welded portion is formed to the region from the end of the through-hole on the steel plate side to the part of 3/4 or less of the thickness of the board, the surface of the board (contact with the steel plate) The distance from the surface opposite to the back surface to the external space) to the weld is 1/4 or more of the thickness of the board, and the weld is not exposed on the board surface. The transfer of heat to is suppressed.

As an example of the welded portion, the wall thickness is 0.5 to 5
A cylindrical member having a diameter of mm (for example, a cylindrical metal member that can be welded to a steel plate) is used (claim 3). By using the tubular member having a predetermined wall thickness as described above, the welding work can be easily performed, and the joining force at the welding location can be sufficiently secured. The board is typically
A refractory board used for the inner wall surface of a steel shell burial tunnel (claim 4). The fire resistant structure of the present invention (claim 5) is
A fireproof structure comprising a steel plate and the board laminated, the welded portion of the board being welded to the steel plate, and a filler (for example, lightweight mortar) in the through hole of the board. , Mineral fibers such as rock wool, etc.) are filled. A preferred example of the fireproof structure is a fireproof structure on the inner wall surface of a tunnel (for example, a steel shell burial tunnel) (claim 6).

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION An example of a board of the present invention and a fireproof structure including the same will be described below with reference to the drawings. Figure 1
Is a perspective view showing an example of the board of the present invention, and FIG.
Sectional drawing which shows the state cut | disconnected by the AA line in FIG. 3, FIG. 3 is the welded part in FIG. 2 (metal cylindrical member which can be welded to a steel plate).
FIG. 4 is a perspective view showing another example of the welded portion,
FIG. 5 is a cross-sectional view showing an example of the fireproof structure of the present invention shown in correspondence with FIG. 2, and FIG. 6 is a diagram for explaining the board manufacturing method of the present invention. In addition, the members with the same name,
In principle, the same symbols are attached.

As shown in FIGS. 1 to 5, the board 1 of the present invention is a board to be mounted on a steel plate 5 (see FIG. 5) in a laminated manner. A hole 3 is provided, and the through hole 3 is at least partially formed by a welded portion 4 embedded in a board 1 capable of being welded to a steel plate 5. The main body 2 of the board 1 is preferably non-combustible or flame-retardant and heat-insulating when it is necessary to consider fire resistance as in a tunnel fire-resistant structure. For example, a calcium silicate board. Inorganic boards such as calcium carbonate board, gypsum board, perlite cement board, fiber reinforced cement board, rock wool board and ALC board can be mentioned. However,
The type (material) of the board 1 is not limited to these and is arbitrary.

The thickness of the board 1 is not particularly limited,
From the viewpoint of ensuring fire resistance and workability at the time of welding with a steel plate, it is preferably 20 to 80 mm. The length and width of the board 1 are also not particularly limited, but it is preferable that the board 1 has a size that allows the work of attaching to the steel plate 5 to be easily performed. For example, the length is about 90 to 200 cm and the width is 4 cm.
It may be about 5 to 120 cm. A plurality of through holes 3 are provided for one board in order to stably mount the board 1 on the steel plate 5. The number of through holes 3 is the board 1
It may be appropriately determined according to the length dimension and the width dimension of. For example, for a board measuring 90 cm (length) × 180 cm (width), as shown in FIG.
Is desirable. The shape of the through hole 3 is arbitrary as long as the welding work of the board 1 and the steel plate 5 can be easily performed by inserting a welding rod into the through hole 3, and for example, a cylindrical shape, a rectangular parallelepiped shape, a triangular prism. It can be formed in a shape, such as a truncated cone shape whose cross-sectional area gradually decreases toward the steel plate. Among them, the cylindrical through hole 3 is preferable from the viewpoint of workability at the time of welding, the size of the weldable area, and the like.

The size of the through hole 3 is not particularly limited,
For example, when it is formed in a cylindrical shape, the diameter is 10 to 50 mm from the viewpoint of workability at the time of welding with the steel plate 5 and workability at the time of filling the through hole 3 with the filler 6 (see FIG. 5). Is preferred. Welded portion 4 formed in through hole 3
Is 3/4 of the thickness of the board from the end of the through hole 3 on the steel plate side.
It is preferably formed over the following portion (particularly preferably 2/3 or less). In this case, if the surface of the board 1 on which the welded portion 4 is formed is brought into contact with the steel plate 5, the distance from the outer surface of the board 1 (the surface facing the external space) to the welded portion 4 Is more than 1/4 of the thickness of the board 1 and the weld 4
It becomes easy to suppress the transfer of heat to the.

The welded portion 4 is usually formed in a shape that matches the shape of the through hole 3, as shown in FIG. For example, when the through hole 3 is formed as a substantially cylindrical hollow, as shown in FIG. 3, a cylindrical member along the inner surface of the through hole 3 (however, the length dimension is preferably Through hole 3
Is designed to be less than 3/4 of the depth. ) Is used. In addition to the form shown in FIG. 3, the welded part 4 has a C-shaped cross section as shown in FIG. 4 (a) (provided with a notch extending axially in the form of a band with respect to the cylindrical shape). 4 (b)
It can be formed into various shapes such as a U-shaped cross section as shown in FIG. Further, the welded portion 4 can be formed as shown in FIG. 4 (c) in which a strip-shaped protrusion 4a is provided on the outer peripheral surface of a cylindrical shape or the like. The protruding portion 4a may be formed as a plurality of rod-shaped members or the like extending outward, other than the belt-shaped member. When the protrusion 4a is provided on the outer peripheral surface as described above, the welded portion 4 is prevented from being detached from the main body portion 2 of the board 1, and the welded portion 4 is reliably and firmly arranged in the board 1. You can

The thickness of the welded portion 4 is not particularly limited,
From the viewpoint of ensuring the strength of the welded portion, preventing deformation during welding, suppressing heat transfer during a fire, etc., it is preferably 0.5 to 5 mm. The material of the welded portion 4 is arbitrary as long as it can be joined to the steel plate by welding, and examples thereof include carbon steel (ordinary steel), special steel, iron, non-ferrous metal (eg, aluminum alloy), and the like. . As a method for welding the welded portion 4 of the board 1 and the steel plate 5, electric welding,
Examples include gas welding. Here, for electric welding,
Covered arc welding, MIG welding (semi-automatic welding), TIG welding (tungsten electrode welding) and the like can be mentioned. For welding, for example, with the board 1 (welded portion 4) in contact with the steel plate 5, a welding rod is inserted into the through hole 3 and the end portion of the welding rod is welded to the welding point (that is, the board 1). Weld 4 of
An arc (spark of discharge) is generated by approaching the vicinity of the boundary of the steel plate 5) to melt the material at the end of the welding rod and to form a joint 7 between the weld 4 and the steel plate 5 (made of a weld material). Can be formed. As the steel plate to which the board of the present invention is attached, since there is no need for thread cutting work for forming an internal thread, the thickness and the material are not limited, and the steel plate having any thickness and material is targeted. be able to.

After the board 1 of the present invention is fixed onto the steel plate 5 by welding, the through hole 3 of the board 1 is filled with a filler 6 as required, as shown in FIG. The filler 6 is not particularly limited, but when fire resistance needs to be taken into consideration as in a tunnel fire resistant structure, it is preferable to use a material having nonflammability or flame retardancy and heat insulation. . For example, the same material as the material of the main body 2 (for example, calcium silicate or the like) may be used, or a material different from the material of the main body 2 (for example, the main body 2).
Is a calcium silicate plate, other materials such as lightweight mortar, rock wool, asbestos) may be used. These materials are filled in the through holes 3 by a method such as spraying or painting (injection).

Next, an example of the board manufacturing method of the present invention will be described. First, as shown in FIG. 6A, for each of the plurality of columnar projections 9 extending vertically upward from the bottom surface of the mold 8, an inner diameter dimension slightly larger than the outer diameter dimension of the projection body 9 is formed. The cylindrical steel member (welded portion) 4 having the is fitted. Then, as shown in FIG.
A material for forming the main body of the board (for example, a slurry containing calcium silicate as a main component) is poured into the board, pressurized, and then cured in an autoclave. If the mold is removed after curing, the board 1 of the present invention as shown in FIG. 6C can be obtained. As shown in FIG. 2, the board 1 is integrally formed of a main body 2 and a steel member (welded portion) 4 and has a through hole 3 having a predetermined diameter. If the projection 9 of the mold 8 is configured to be slidable downward with respect to the mold 8, the board 1 can be easily demolded.

[0017]

Example 1 A board having the structure shown in FIGS. 1 and 2 and having dimensions of 90 cm in length × 180 cm in width × 35 mm in thickness, in which the main body 2 is composed mainly of calcium silicate. It is made of a refractory material with a through hole 3 of 30m
with a diameter of m, the weld 4 has a length of 20 mm and an inner diameter of 30.
board 1 (calcium silicate plate), which is made of a cylindrical iron member having a thickness of 3 mm and a thickness of 3 mm, and six through holes 3 including these welded portions 4 are provided substantially evenly on each board having the above dimensions. Was produced. With the board 1 in contact with the steel plate 5, a welding rod was inserted into the through hole 3 and the welded portion 4 of the board 1 and the steel plate 5 were welded by arc welding. This operation was repeated to attach the eight boards 1 to the steel plates 5, and then the through holes 3 of the boards 1 were filled with lightweight refractory mortar to complete the fire resistant structure. The time required from the start of the work (when the welding rod was started) to the end of the work (when the fireproof structure was completed) was 35 minutes. Moreover, it was confirmed that the board 1 and the steel sheet 5 were firmly laminated by tapping the steel sheet from the back surface. Furthermore, board 1
A flame was applied to the vicinity of the through-hole 3 from the front side of the board 1 to check the temperature rising state of the steel sheet 5, but no rapid temperature rising was observed.

[Comparative Example 1] A board having the same structure as the board 1 of Example 1 was prepared except that the through hole 3 and the welded portion 4 were not provided. With this board in contact with the steel plate, at the same position as the through hole 3 of the board 1 of Example 1, holes (6 places) were opened with an electric drill, and then the steel plate was threaded with a screw tap, The board was fixed on the steel plate by forming an internal thread and screwing a bolt into the internal thread. The time required from the start of work (start of drilling with an electric drill) to the end of work (when the fireproof structure is completed) is 9
It was 0 minutes. Moreover, it was confirmed that the board 1 and the steel sheet 5 were firmly laminated by tapping the steel sheet from the back surface. Further, when a flame was applied to the vicinity of the through hole 3 of the board 1 from the surface side of the board 1 and the temperature rising state of the steel plate 5 was observed, a relatively rapid temperature rise was observed.

[0019]

INDUSTRIAL APPLICABILITY The board of the present invention, when laminated and attached to a steel plate, does not decrease the joint strength with the steel plate even at high temperature, and it is difficult for heat to be transferred to the steel plate, and has excellent fire resistance. Besides, the construction work can be performed quickly and easily. Therefore, the board of the present invention is
It can be suitably used as a fireproof covering member or the like that is laminated on the surface of a steel plate forming an inner wall of a steel shell burial tunnel or the like.

[Brief description of drawings]

FIG. 1 is a perspective view showing an example of a board of the present invention.

FIG. 2 is a cross-sectional view showing a state cut along line AA in FIG.

3 is a perspective view showing a welded portion (a metal cylindrical member) in FIG. 2. FIG.

FIG. 4 is a perspective view showing another example of a welded portion.

FIG. 5 is a cross-sectional view showing an example of the fire resistant structure of the present invention shown corresponding to FIG.

FIG. 6 is a diagram for explaining the board manufacturing method of the present invention.

[Explanation of symbols]

1 board 2 body 3 through holes 4 welds 4a protrusion 5 steel plate 6 Filling material 7 Joint part (welding material) 8 frame 9 protrusions

Claims (6)

[Claims] 1. A board for laminating and attaching to a steel plate, wherein a plurality of through holes are provided in a thickness direction of the board, and the through holes are weldable portions capable of being welded to the steel plate. A board characterized by being at least partially formed by. 2. The board has a thickness of 20 to 80 mm, and the welded portion is formed from the end of the through hole on the steel plate side to a portion of 3/4 or less of the thickness of the board. The board according to claim 1, which is provided. 3. The board according to claim 1, wherein the welded portion is made of a tubular member having a wall thickness of 0.5 to 5 mm. 4. The board according to claim 1, wherein the board is a refractory board. 5. A refractory structure formed by laminating a steel plate and the board according to claim 4, wherein the welded portion of the board is welded to the steel plate, and the through hole of the board is provided. A fireproof structure characterized by being filled with a filler. 6. The fire resistant structure according to claim 5, wherein the fire resistant structure is a fire resistant structure on an inner wall surface of a tunnel.