JP2007039924A - Fireproof panel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fireproof panel for being mounted on the surface of a concrete structure, which prevents a panel body from being cracked due to a difference between a coefficient of thermal expansion of a panel body and that of thermal expansion of an embedded nut member, and which prevents the nut member from being damaged by dynamic wind pressure. <P>SOLUTION: This fireproof panel comprises the panel body 14 which is composed of an inorganic material, and the nut member 7 which is opened on the front side of the concrete structure and which is embedded in the panel body 14. The nut member 7 is formed of ceramics, and an outer shape of the nut member 7 is formed as a curved one. <P>COPYRIGHT: (C)2007,JPO&INPIT

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. 8, 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. Further, Patent Document 3 is an improvement of the joint work as described above, and a nut member is embedded in the panel body so that the mounting member is not exposed to the tunnel inner surface side 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.

  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. The aim is to obtain a fireproof panel that can.

The 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 opened on the surface side of the panel body made of an inorganic material and the concrete structure and embedded in the panel body. A plurality of nut members are provided, and the nut members are formed of ceramics in a curved shape.
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, and 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. Therefore, a stable and safe fireproof panel can be obtained during normal times and fires.

  The best mode for carrying out the present invention will be described below with reference to the drawings. FIGS. 4A to 4C are explanatory views of a method for manufacturing a curved fireproof panel according to the best mode of the present invention. The curved fireproof panel is attached to the surface (inner surface) of a curved concrete structure. Is done. 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. 4 (a), 6 is a metal curved hollow mold (shown in a straight line for convenience in the figure), and has a plurality of refractory raw material pressure inlets 6a on the upper convex side. The mold 6 is placed on the conveying roller 8 and carried in. However, as shown in FIG. 4B, the mold 6 is guided and conveyed by the conveying side guide 9 with the concave surface on the lower side. In the next raw material press-fitting step, a refractory raw material is press-fitted from the raw material inlet 6 a 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, while pressing the hydraulic admixture or after the press-fitting, in the vibration step of FIG. 2 (c), the mold 6 or the conveyance side guide 9 is directly vibrated to remove bubbles, and the mold 6 Make sure to fill the material inside. 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. 5A shows an enlarged sectional view of a part A of FIG. 4B. A nut member 7 is attached to the upper convex surface side of the mold 6 by a mounting bolt 10, and a refractory material is provided inside the mold 6. A filling space 6e is formed. The raw material pressure inlet 6a has an air hole (not shown), and is provided with a lid 6c that can be opened and closed via a hinge 6b as shown in FIG. 5B, which is an enlarged view of a portion B in FIG. 5A. A lock portion 6d that locks 6c to the raw material pressure inlet 6a is provided. FIG. 5C is an enlarged view of a portion C of FIG. 5A, and a steel plate 11 serving as an interior material is provided on the lower frame of the casing-shaped 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 11 is unnecessary. The steel plate 11 may be applied to the entire surface of the tunnel, but it is expensive. Therefore, the steel plate 11 is installed in 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 11 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 11 is welded to the inner surface side of the stainless steel plate 11a by a spot welding portion 11c with a fixing reinforcing member 11b such as a metal mesh made of stainless steel, the steel plate 11a is provided with a saddle layer 11d on the outer surface side. The fixed reinforcing member 11b is provided in order to ensure the bonding force between the steel plate 11 and the fireproof layer. The fixed reinforcing member 11b 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 eaves layer 11d directly on the panel body. Moreover, although the saddle steel plate 11 is provided in order to improve the stain resistance and the line-of-sight guidance effect, a material other than the saddle steel plate 11 may be used. Further, the steel plate 11 is not necessarily provided, and the fireproof panel 13 may be formed only by the panel body 14 in which the nut member 7 is embedded.

  6 (a) is an enlarged view of a portion D in FIG. 5 (a), and FIG. 6 (b) is a further enlarged view of the part. A hole 6f is provided, and a through hole 6g penetrating from the upper side of the upper frame to the hole 6f is provided. A rubber packing 12 having a trapezoidal cross section is fitted into the hole 6f, and the two are bonded with an adhesive. The rubber packing 12 is provided in order to prevent the flowable refractory raw material from entering the nut member 7. For the rubber packing 12, 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. The mounting bolt 10 is inserted into the through hole 6g of the mold 6 and the insertion hole 12a of the rubber packing 12, and is screwed into the nut member 7. Is attached to the mold 6.

  As shown in FIG. 8, 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 11 is installed, it is necessary to avoid interference with the fixed reinforcing member 11b so that the effect of embedding the nut member 7 is not affected by the presence of the fixed reinforcing member 11b. When the fixed reinforcing member 11b is a metal mesh, as shown in FIG. 5A, the fixing reinforcing member 11b is attached to a position where the distance from the corrugated metal mesh 11b is separated, that is, a portion facing the wave valley. Or it attaches to the center part between the mesh lines of the metal mesh 11b as shown in FIG.

  FIG. 1A shows an example of the fireproof panel 13 manufactured as described above. The panel body 14 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 of It is 27 mm, and the nut members 7 are embedded in a total of six locations in pairs. FIG. 1B shows a mounting structure of the fireproof panel 13 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 15 having a shape similar to that of the member 7 is embedded, and a fixing bracket 16 is attached to the nut member 15 with a bolt 17. On the other hand, a mounting bracket 18 is attached with a bolt 19 between a set of nut members 7 in which the fireproof panel 13 is embedded. FIG. 2A is a perspective view of the fixing bracket 16, and an engaging portion 16 b that is bent upward and downward from the end of the U-shaped main body portion 16 a is provided, and at the center of the main body portion 16 a. An insertion hole 16 c for the bolt 17 is provided, and the fixing bracket 16 is attached to the primary covering body 2 by screwing the bolt 17 inserted into the insertion hole 16 c into the primary covering body 2. The engaging portion 16b is longer on the lower side.

  FIG. 2B shows a mounting structure of the fireproof panel 13 to the primary lining body 2 when the shield tunnel 1 is cut vertically. The mounting bracket 18 attached to the upper fireproof panel 13 and the lower fireproof panel 13 are shown. The upper and lower engaging portions 16b of the fixing bracket 16 are inserted into the mounting bracket 18 attached to the mounting bracket 18, and the leaf spring 20 is inserted between the fireproof panel 13 and the engaging portion 16b of the fixing bracket 16 so that the brackets 16, 18 are inserted. Fix the gap.

  The work of attaching the fireproof panel 13 to the primary lining body 2 will be described again with reference to FIG. 3. In FIG. 3, the lower part of the refractory panel 13 on the lower side is already attached to the fixing bracket 16 on the lining body 2 side and the fireproof panel 13 side. It is fixed to the lining body 2 side through a metal fitting 18. Here, the lower engaging portion 16b of the fixing metal fitting 16 attached to the cover body 2 is inserted into the attachment metal fitting 18 attached to the upper portion of the lower fireproof panel 13 by the bolts 19, and the fireproof panel 13 and the lower engagement are engaged. A leaf spring 20 is inserted between the metal parts 16b to fix the metal parts 16 and 18, and the lower fireproof panel 13 is fixed. Next, the upper engaging portion 16b of the fixing bracket 16 on the covering body 2 side is inserted into the mounting bracket 18 attached to the lower portion of the upper fireproof panel 13, and the fireproof panel 13 and the upper engaging portion 16b are inserted. A plate spring 20 is inserted between the brackets 16 and 18 and the lower portion of the upper fireproof panel 13 is fixed. Thereafter, the fireproof panel 13 is attached to the inner wall of the lining body 2 in the same manner.

  As described above, in the above-described best embodiment, since the nut member 7 embedded in the panel body 14 is formed of ceramics, the coefficient of thermal expansion can be approximated to the panel body 14 made of an inorganic material. Due to the difference in coefficient of thermal expansion between the main body 14 and the nut member 7, it is possible to prevent the panel main body 14 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. Therefore, a stable and safe fireproof panel 13 can be obtained during normal times and fires.

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. 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 explanatory drawing of the manufacturing method of the fireproof panel by this Embodiment best mode. It is the A section expansion expanded sectional view of Drawing 4 (b), the B section enlarged view of Drawing 5 (a), and the C section enlarged view. It is the D section enlarged view of Drawing 5 (a), and its partial enlarged view. It is explanatory drawing of the arrangement | positioning relationship with respect to the metal mesh of the nut member 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 13 ... Fireproof panel 14 ... Panel main body

Claims (4)

  A fireproof panel to be mounted on the surface of a concrete structure, comprising a panel body made of an inorganic material and a plurality of nut members that are open on the surface side of the concrete structure and embedded in the panel body. A fireproof panel characterized in that the outer shape is formed into a curved surface.   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 central 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.

Images