JP4641463B2 - Fireproof panel - Google Patents

Description

  The present invention relates to a fireproof panel to be mounted on the surface of a concrete structure, and relates to a fireproof panel to be mounted on a lining inner surface of a tunnel such as a shield tunnel.

  For example, in a shield tunnel, a concrete segment is generally used as a lining material for the inner surface of the tunnel. Recently, it has been demanded that this type of shield tunnel has a fireproof structure. As the fireproof structure, a fireproof material is sprayed directly on the inner surface of the segment and applied, or a fireproof panel is provided. What to wear is known.

  For example, Patent Document 1 is known as a device for mounting a fireproof panel. In FIG. 7, reference numeral 1 denotes an existing shield tunnel, and a reinforced concrete panel or iron and concrete is provided on the inner surface of a natural ground. The inner wall of the tunnel is constructed by constructing a primary lining body (concrete structure, concrete segment) 2 composed of a composite panel and the like in an annular shape. A floor slab 3 is placed in the primary lining body 2, and the upper surface of the floor slab 3 serves as a road floor 4 for driving an automobile. Moreover, the fireproof panel 5 is arrange | positioned by the inner surface of the primary lining body 2, and the fireproof panel 5 is formed with the heat insulating material and the metal plate attached to the inner side with the volt | bolt. 2a and 5a are joint portions of the primary lining body 2 and joint portions of the fireproof panel 5.

However, if the mounting member of the fireproof panel is exposed on the inner surface side of the tunnel in this way, the mounting member is directly exposed to flames and heat in the event of a fire, which affects the deterioration of fire resistance. Some have been devised not to be exposed. For example, in Patent Document 2, the head of a metal bolt that fixes the fireproof panel is buried in the fireproof panel and covered with a fireproof joint material so that the head of the metal bolt is not exposed to the inner peripheral surface of the tunnel. ing. Patent Document 3 is an improvement of the joint work as described above, and a nut member is embedded in the panel main body so that the mounting member is not exposed to the inner surface of the tunnel when the fireproof panel is attached.
JP 2002-201896 A JP 2001-311395 A JP 2004-238873 A

  According to Patent Document 3, the mounting member for the fireproof panel is not exposed on the inner surface side of the tunnel, but a nut member needs to be embedded in the panel body. Although the material and shape of the nut member are not disclosed, it is assumed that the nut member is made of metal when inferred from a cylindrical shape having a disc-shaped flange at one end. On the other hand, the tunnel inner surface side of the fireproof panel is required to have fire resistance and heat resistance even when exposed to 1200 ° C. for 1 hour, for example, and has the following problems. That is, the heat of the heated panel body is absorbed by the panel body, but part of the heat is transmitted to the segment side via the nut member and the bolt. For this reason, the nut member is concentratedly heated, and the panel body may be cracked by the expanding nut member due to the difference in thermal expansion between the panel body and the embedded nut member. Further, since the nut member has an angular shape, the panel body repeatedly vibrates due to the influence of dynamic wind pressure caused by the vehicle passing through the tunnel, and the burying force of the nut member may be reduced.

  Therefore, the inventors formed the nut member with a curved surface in order to form the nut member with a material having the same thermal expansion coefficient as that of the panel main body, and to make the nut member less susceptible to vibration due to the influence of dynamic wind pressure. We focused on the fact that the above problem can be solved by making the shape smooth. That is, by forming the nut member from ceramic, the thermal expansion coefficient with the panel body can be approximated, and the problem that the panel body is cracked due to the presence of the nut member can be solved. Since it is a member which consists of a smooth curved surface, it paid attention that damage by vibration can be prevented.

Further, in the tunnel, in addition to the fireproof structure, a line-of-sight guidance means is provided on the inner wall surface at the lower part of the tunnel for the purpose of ensuring safe vehicle travel. That is, in the tunnel, for example, a steel plate is provided as a line-of-sight guidance means to reflect visible light from an illumination lamp, a headlight, etc. in the tunnel, and this steel plate is also used from the viewpoint of stain resistance. ing. However, the steel sheet is effective for gaze guidance and antifouling, but lacks fire resistance.
Therefore, the inventors have focused on adding both the antifouling function and the line-of-sight guidance function to the fireproof panel essential for obtaining the fireproof characteristics.

  The present invention has been made to solve the above-described problems, and can prevent the occurrence of cracks in the panel body and also prevent the nut member from being damaged by vibration due to the influence of dynamic wind pressure. Furthermore, it aims at obtaining the fireproof panel provided with the antifouling function and the gaze guidance function.

A fire-resistant panel according to claim 1 of the present invention is a fire-resistant panel to be mounted on the surface of a concrete structure, and is formed by filling and solidifying a fire-resistant raw material made of an inorganic material into a mold, and a ceramic outer shape. A nut member formed in a curved shape and embedded in the panel main body by solidification of the refractory raw material, and a fixing reinforcing member on the back surface having a flange layer on the front surface, and the fixing reinforcing member by the solidification of the refractory raw material Comprising a steel plate bonded to the panel body by being embedded in the panel body,
The fixed reinforcing member is made of any one of a wavy metal mesh, a rod-shaped angle material, and a channel material,
When the fixed reinforcing member is a corrugated metal mesh, the metal mesh is attached to the steel plate at a position where the wave trough of the metal mesh faces the nut member in a plane,
When the fixing reinforcing member is a rod-shaped angle member or channel member, the fixing reinforcing member and the nut member are arranged at different positions on a plane .

In the fireproof panel according to claim 2 , the panel body is a combined body made of an inorganic material by a water curing reaction.

The fireproof panel according to claim 3 is a semi-cylindrical shape in which the nut member has one end opened and the other end closed, and the outer diameter of the substantially central portion in the axial direction is D, the outer diameter of the opening side end is D1, The outer diameter of the closed end is D2, D> D1, D2, and the center and both ends are formed in a convex curved shape.

In the fireproof panel according to claim 4 , the nut member is a cap nut.

  As described above, according to the present invention, since the nut member is formed of ceramics, the thermal expansion coefficient can be approximated to that of the panel main body, and the thermal expansion coefficient between the panel main body and the nut member embedded in the panel main body. Due to this difference, it is possible to prevent the panel body from being cracked by heating during a fire. Further, since the outer shape of the nut member is formed into a curved surface, damage due to vibration can be prevented. Further, in the panel body, a soot layer is provided on the opening side of the nut member, that is, on the side opposite to the inner surface side of the tunnel (concrete segment side), and this soot layer cleans dirt due to exhaust gas or the like at normal times. It becomes easy and has an antifouling effect, and a visible line guiding effect is obtained by reflecting visible light by this ridge layer. In addition, the firewood layer is damaged in the event of a fire, but it is equipped with a fireproof panel body in the back, so it will not damage the concrete segments behind it, so it is stable and safe in normal and fire situations. A fireproof panel can be obtained.

  The best mode for carrying out the present invention will be described below with reference to the drawings. FIGS. 2A to 2C are explanatory views of a method of manufacturing a curved fireproof panel according to the best mode of the present invention. The curved fireproof panel is a curved concrete structure which is the inner surface of a tunnel. Mounted on the surface (inner surface). A plurality of nut members 7 which are opened on the surface side of the concrete structure and embedded in the panel body are attached to the curved mold 6. In FIG. 2 (a), 6 is a metal hollow mold, which is actually formed in a curved shape, and has a plurality of refractory material pressure inlets 6a on the upper convex curved surface side. The mold 6 is carried in by the conveyance roller 8, but as shown in FIG. 2B, the mold 6 is guided and conveyed by the conveyance side guide 9 with the concave surface on the lower side. In the next raw material press-fitting step, a refractory raw material in which a predetermined raw material is mixed and mixed is injected from the raw material press-in port 6a on the upper convex surface side of the mold 6. The refractory raw material is composed of an inorganic material including a main component aggregate, a hydraulic inorganic material that is a binder, and a toughening imparting fibrous material. Cordierite or the like is used as the aggregate, and alumina cement or blast furnace cement or the like is used as the hydraulic inorganic material. The toughening imparting fibrous material is an alkali-resistant fiber, and a polyvinyl alcohol fiber or the like is used. Then, each of these materials is kneaded under water to obtain a hydraulic admixture. Next, in the vibration step shown in FIG. 2 (c) during and after the injection of the hydraulic admixture, the mold 6 or the conveyance side guide 9 is directly vibrated to remove bubbles, and the raw material in the mold 6 is removed. Ensure filling. As what gives vibration, what is generally used as a concrete vibrator is used. For example, it is a thing known by Unexamined-Japanese-Patent No. 2000-27440 etc. or a vibrator. Next, steam curing is performed before the viscosity of the press-fitted hydraulic admixture increases, and after the hydraulic admixture is self-cured, the mold is removed to obtain a panel body in which the nut member 7 is embedded. Therefore, the panel body is a combined body made of an inorganic material by a water curing reaction.

  FIG. 1 (a) shows an enlarged development sectional view of part A of FIG. 2 (b), and the mold 6 has one upper convex curved surface side portion (lid portion) 6b and the other lower concave curved surface side portion (container shape). Part) 6c is integrated with a bolt 10, and a nut member 7 is attached to the inner surface side of one upper convex curved surface side part 6b of the mold 6 with a fixing bolt 11, and the inside of the mold 6 is fireproof. A raw material filling space 6d is formed. When removing (removing) the panel main body, the bolts 10 and 11 are removed to remove one upper convex curved surface side portion 6b of the mold 6, and a hanging tool is attached to the nut member 7 embedded in the panel main body. The panel body is lifted or the other lower concave curved surface side portion 6c of the mold 6 is lowered to take out the panel body.

  The raw material pressure inlet 6a has an air hole (not shown), and is provided with an openable / closable lid 6f via a hinge 6e as shown in FIG. A lock portion 6g for locking the open / close lid 6f to the raw material pressure inlet 6a is provided.

  FIG. 1C is an enlarged view of a portion C of FIG. 1A, and a steel plate 12 serving as an interior material is provided in the container-like lower concave curved surface portion 6c of the mold 6. In the case of a fireproof panel installed in the upper part of the tunnel where no interior material is required, the steel plate 12 is unnecessary. Although the steel plate 12 may be applied to the entire surface of the tunnel, it is expensive. Therefore, the steel plate 12 is installed at the lower portion of the tunnel (side portion close to the roadway) and can be easily cleaned against contamination such as exhaust gas. I can do it. Further, in the tunnel, a steel plate 12 is applied to reflect visible light from the illuminating lamp and the headlight in the tunnel for the effect of visual line guidance. After the steel plate 12 is welded to the inner surface side of the stainless steel plate 12a by a spot welding portion 12c with a fixing reinforcing member 12b such as a metal mesh made of stainless steel, the outer surface side of the stainless steel plate 12a, that is, the opposite side of the opening side of the nut member 7 The cocoon layer 12d is applied. The fixed reinforcing member 12b is provided to ensure the bonding force between the steel plate 12 and the fireproof layer. The fixed reinforcing member 12b is not limited to a metal mesh, and may be a rod-shaped angle material, a channel material, or the like. When a metal mesh is used, it is processed into a wave shape to further strengthen the bonding force. It is also possible to provide the heel layer 12d directly on the panel body. Moreover, although the saddle steel plate 12 is provided in order to improve the stain resistance and the line-of-sight induction effect, a material other than the saddle steel plate 12 may be used. Thus, after providing the steel plate 12 on the inner bottom surface of the other lower concave curved surface side portion 6c of the mold 6, the nut member 7 is attached to the one upper convex curved surface side portion 6b by the fixing bolt 11, The upper convex curved surface side portion 6b is attached to the other lower concave curved surface side portion 6c by a bolt 10.

  FIG. 1D is an enlarged view of a portion D in FIG. 1A, and FIG. 1E is a further enlarged view of the portion. A dovetail-shaped recess hole 6h is provided, and a bolt through hole 6i is provided through the recess hole 6h from the upper side of one upper convex curved surface side portion 6b. A rubber packing 13 having a trapezoidal cross section is provided in the recess hole 6h. At the same time, they are bonded together with an adhesive 14 to prevent the rubber packing 13 from falling off. The rubber packing 13 is a seal member for preventing a fluid fireproof raw material from entering the nut member 7. For the rubber packing 13, for example, SBR (styrene butadiene rubber) having a hardness of 70 to 90 ° is used. The nut member 7 is formed of an alumina ceramic sintered body so that the outer diameter shape is a curved surface. Further, the nut member 7 is formed into a semi-cylindrical cap nut having one end opened and the other end closed, and the outer diameter of the central portion in the axial direction is D, the outer diameter of the opening side end is D1, and the closed side The outer diameter of the end portion is D2, D> D2 ≧ D1, and the central portion and both ends are formed in a convex curved shape. A notch detent 7a is provided on the outer periphery of the nut member 7, and the fixing bolt 11 is inserted into the bolt through hole 6i of the mold 6 and the insertion hole 13a of the rubber packing 13, and is screwed into the nut member 7 to be nut member. 7 is attached to the inner wall surface of one upper convex curved surface side portion 6b of the mold 6, and one upper convex curved surface side portion 6b of the mold 6 and the other lower concave curved surface side portion 6c are joined by a bolt 10, The refractory raw material filling space 6d is filled with the refractory raw material and solidified.

As shown in FIG. 7, since the fireproof panel 5 is attached to the inner surface of the concrete segment which is the primary lining body 2, the attachment position of the nut member 7 with respect to the mold 6 is basically determined by the relationship with the concrete segment. . When the steel plate 12 is installed, it is necessary to avoid interference with the fixed reinforcing member 12b so that the effect of embedding the nut member 7 is not affected by the presence of the fixed reinforcing member 12b. When the fixed reinforcing member 12b is a metal mesh, as shown in FIG. 1 (a), the fixing reinforcing member 12b is attached to a position away from the corrugated metal mesh 12b, that is, a portion facing the wave trough. Or it attaches to the center part between the mesh lines of the metal mesh 12b as shown in FIG.
FIG. 4A shows an example of the fireproof panel 15 manufactured as described above. The panel body 16 formed in a curved shape has a curvature radius of 5550 mm, a width of 1550 mm, a height of 1150 mm, and a thickness. It is 27 mm, and the nut members 7 are embedded in a total of six locations in pairs. FIG. 4B shows a mounting structure of the fireproof panel 15 to the primary lining body (concrete segment) 2 when the shield tunnel 1 is cut horizontally. The primary lining body 2 is also made of ceramics and nuts. A large nut member 17 having a shape similar to that of the member 7 is embedded, and a fixing bracket 18 is attached to the nut member 17 with a bolt 19. On the other hand, the mounting bracket 20 is attached with a bolt 21 between the set of nut members 7 of the fireproof panel 15. FIG. 5A is a perspective view of the fixing bracket 18, and an engaging portion 18 b that is bent upward and downward from the end of the U-shaped main body portion 18 a is provided, and at the center of the main body portion 18 a. An insertion hole 18 c for the bolt 19 is provided, and the fixing bracket 18 is attached to the primary covering body 2 by screwing the bolt 19 inserted into the insertion hole 18 c into the nut member 17 of the primary covering body 2. The lower side of the engaging portion 18b of the fixing bracket 18 is longer.

  FIG. 5B shows a mounting structure of the fireproof panel 15 to the primary lining body 2 when the shield tunnel 1 is cut vertically. The mounting bracket 20 attached to the upper fireproof panel 15 and the lower fireproof panel 15 are shown. The upper and lower engaging portions 18b of the fixing bracket 18 are inserted into the mounting bracket 20 attached to the mounting bracket 20, and the leaf spring 22 is inserted between the fireproof panel 15 and the engaging portion 18b of the fixing bracket 18 so that the brackets 18 and 20 are inserted. Fix the gap.

  The work of attaching the fireproof panel 15 to the primary lining body 2 will be described again with reference to FIG. 6. In FIG. 6, the lower part of the refractory panel 15 on the lower side has already been fixed to the fixing bracket 18 on the side of the lining body 2 and It is fixed to the lining body 2 via the mounting bracket 20. Here, the lower engagement portion 18b of the fixing metal fitting 18 attached to the cover body 2 is inserted into the attachment metal fitting 20 attached to the upper portion of the lower fireproof panel 15 with the bolt 21, and the fireproof panel 15 and the lower engagement are engaged. The leaf spring 22 is inserted between the portion 18b, the metal fittings 18 and 20 are fixed, and the lower fireproof panel 15 is fixed. Next, the upper engaging portion 18b of the fixing bracket 18 on the covering body 2 side is inserted into the mounting bracket 20 attached to the lower portion of the upper fireproof panel 15, and the fireproof panel 15 and the upper engaging portion 18b are inserted. A leaf spring 22 is inserted between the brackets 18 and 20, and the lower portion of the upper fireproof panel 15 is fixed. Thereafter, similarly, the fireproof panels 15 are sequentially attached to the inner wall of the lining body 2.

  As described above, in the above-described best embodiment, the nut member 7 embedded in the panel body 16 is formed of ceramics, so that the thermal expansion coefficient can be approximated to the panel body 16 made of an inorganic material. Due to the difference in coefficient of thermal expansion between the main body 16 and the nut member 7, it is possible to prevent the panel main body 16 from being cracked due to heating during a fire. Moreover, since the outer shape of the nut member 7 is formed into a curved surface, damage due to vibration can be prevented. Further, the panel body 16 is provided with a soot layer 12d on the opening side of the nut member, that is, on the side opposite to the inner surface side (concrete segment side) of the tunnel. Is easy to clean and has an anti-fouling function, and a visible line guiding effect is obtained by reflecting visible light by the ridge layer 12d. In addition, the firewood layer 12d is damaged in the event of a fire, but since the fireproof panel body 16 is provided in the back, the back concrete segment is not damaged, and therefore stable in normal and fire conditions. A safe fireproof panel 15 can be obtained.

It is the A section expanded development sectional view of Drawing 2 (b), the B section enlarged view of Drawing 1 (a), the C section enlarged view, the D section enlarged view, and its partial enlarged view. It is explanatory drawing of the manufacturing method of the fireproof panel by this Embodiment best mode. It is explanatory drawing of the arrangement | positioning relationship with respect to the metal mesh of the nut member by this Embodiment best mode. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a fireproof panel according to an embodiment of the present invention and a cross-sectional plan view of a fireproof panel mounting structure for a primary lining body. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a fixing metal fitting according to an embodiment of the present invention and a longitudinal front view of a structure for attaching a fireproof panel to a primary lining body. It is explanatory drawing of the attachment operation | work of the fireproof panel with respect to the primary lining body by this Embodiment best mode. It is a perspective view of the shield tunnel shown by patent document 1. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Shield tunnel 2 ... Primary lining body 6 ... Formwork 7 ... Nut member 11 ... Fixing bolt 12 ... Steel plate 12d ... Steel layer 15 ... Fireproof panel 16 ... Panel main body

Claims (4)

A fireproof panel to be mounted on the surface of a concrete structure,
A panel body formed by filling and solidifying a refractory raw material made of an inorganic material into a mold,
A nut member formed in a curved shape with ceramics and embedded in the panel body by solidifying the refractory raw material;
A steel plate coupled to the panel body by having a steel layer on the front surface and a fixed reinforcing member on the back surface, and the fixed reinforcing member is embedded in the panel main body by solidifying the refractory raw material,
The fixed reinforcing member is made of any one of a wavy metal mesh, a rod-shaped angle material, and a channel material,
When the fixed reinforcing member is a corrugated metal mesh, the metal mesh is attached to the steel plate at a position where the wave trough of the metal mesh faces the nut member in a plane,
When the fixing reinforcing member is a rod-shaped angle member or channel member, the fixing reinforcing member and the nut member are disposed at different positions in a plan view . The fireproof panel according to claim 1, wherein the panel body is a bonded body made of an inorganic material by a water curing reaction . The nut member has a semi-cylindrical shape with one end opened and the other end closed. The outer diameter of the axially central portion is D, the outer diameter of the opening end is D1, and the outer diameter of the closing end is D2. The fireproof panel according to claim 1 , wherein D> D1 and D2 are satisfied, and the center portion and both ends are formed in a convex curved shape . The fireproof panel according to any one of claims 1 to 3 , wherein the nut member is a cap nut .

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