JP4352006B2 - Tunnel fireproof interior structure - Google Patents

Description

  The present invention relates to a fireproof interior structure of, for example, a road tunnel, a railway tunnel, and other various tunnels.

  Conventionally, various methods have been proposed for protecting a concrete frame from a fire by providing a refractory material on the inner surface of the tunnel lining such as lining concrete or segments laid on the inner surface of the tunnel. In this type of construction method, the refractory material is floated at a predetermined interval with respect to the lining as a method to ensure that the refractory does not break even when the lining is displaced or deformed. There is a way to do it.

  By the way, in a road tunnel, for example, an interior material is usually laid on the side wall portion on the inner surface of the lining for the purpose of keeping the inside of the tunnel bright and ensuring the visibility of the driver of the car passing through the tunnel. As a means for providing such an interior material on the inner surface side of the refractory material as described above, a technique as described in Patent Document 1 has been proposed.

  For example, in FIG. 5 of the above-mentioned Patent Document 1, a refractory material layer is integrally formed on the back side of an interior finish material via a partition plate, and a bolt inserted through the interior finish material and the refractory material layer is covered (structure Although it is disclosed that it is screwed and fixed to an anchor embedded in the material), it is extremely difficult to mount in accordance with the unevenness of the lining and the curve, and the interior finish against the displacement of the lining There is a possibility that the integrally formed product of the material and the refractory material layer may be damaged without following.

  Further, FIG. 6 of Patent Document 1 discloses a configuration in which an interior finish material and a refractory material layer are formed separately and are attached with bolts and double nuts at a predetermined interval. The bolt inserted from the surface (inner surface) side of the material is screwed into an anchor embedded in the lining, and the interior finishing material and the refractory material layer have substantially no play with respect to the lining. As with the case, there is a concern about breakage due to displacement of the lining. In addition, since the refractory material layer and the interior finish material are positioned with a double nut, the adjustment work is extremely complicated and troublesome.

  In addition, the refractory material layer is floated against the lining, and the interior finish material is floated and installed on the refractory material layer, so that they protrude greatly into the tunnel and the hollow cross section in the tunnel becomes small There is a bug. Furthermore, by mounting each refractory material layer and interior finish material floating, the load applied to the lining increases, the anchor pitch must be reduced to increase the number of placements, and thick bolts must be used, There are also problems such as loss of aesthetics and increased burden on segments and lining concrete.

Japanese Patent Laid-Open No. 11-294098

  The present invention has been proposed in view of the above problems, and an object of the present invention is to provide a fireproof interior structure of a tunnel that has good interior effects and fireproof performance, is lightweight, and can be easily and inexpensively constructed.

In order to achieve the above object, the fireproof interior structure of a tunnel according to the present invention has the following configuration. That is, an interior material made of an aluminum-plated enameled steel plate in which a steel plate such as iron or stainless steel, an aluminum plating layer, and an enamel layer is laminated in order is formed in a size substantially the same as that of the refractory material 3, and the surface of the refractory material The refractory material is attached to the upper and lower sides of the refractory material in a state in which the interior material is directed to the tunnel space side, and the engagement fitting. The inner wall of the tunnel lining segment is attached to the inner surface of the tunnel lining segment via a substantially horizontal U-shaped gap holding bracket provided on the upper and lower opposing pieces, and the interior material and The length of the refractory material in the tunnel axial direction is formed substantially equal to the length of the segment in the tunnel axial direction, and the interval holding metal fitting is attached to an insert nut embedded in the segment in the circumferential direction at a predetermined arrangement pitch. In the U-shaped recess of the metal fitting, a flame entrainment prevention material that closes the gap between the refractory materials adjacent in the tunnel circumferential direction and a flame entrainment prevention material that closes the gap between the refractory materials adjacent in the tunnel axial direction are provided. It is characterized by being interposed between the refractory material and the segment .

As described above, the refractory material having the interior material on the surface is predetermined on the inner surface of the tunnel lining segment through the locking metal fittings provided on the upper and lower sides of the back surface and the spacing metal fittings engaged therewith. It is possible to install easily even if there is unevenness or a curve on the inner surface of the segment , and it is possible to attach the refractory material with the interior material on the surface to the inner surface of the segment. Interior materials can be installed at the same time in one installation. Furthermore, since the interior material is integrally attached to the surface of the refractory material with an adhesive material, it is possible to use a relatively thin and light interior material, and the air cross section in the tunnel is not narrowed. There is no need to provide hardware for mounting. In addition, it is easy to create a fireproof interior structure that combines fireproof performance that prevents concrete from being damaged or deteriorated in the event of a fire, and interior effects such as ensuring safety in the tunnel and maintaining aesthetics through cleaning and recovery. There are effects such as being able to construct at low cost.

  Hereinafter, the present invention will be specifically described based on embodiments shown in the drawings. 1 to 3 show an embodiment of a fireproof interior structure of a tunnel according to the present invention. FIG. 1 is a cross-sectional view of a tunnel in which the fireproof interior structure according to the present invention is being constructed, FIG. Is an enlarged view of a part thereof, FIG. 2B is an inner surface view thereof, FIG. 3C is a sectional view taken along line cc in FIG. 3B, and FIGS. 3A to 3C are FIGS. It is a partial enlarged view of (c).

In FIG, 1 is a concrete segments for tunnel lining as a ton, channel lining was laid on the inner surface of the tunnel T, the segment 1 is formed in a circular arc shape as shown in FIG. 1 and FIGS. 4 (a) After the tunnel excavation, the segments 1 are sequentially arranged on the inner surface thereof in the circumferential direction, and the entire inner surface of the tunnel is covered while being sequentially added in the tunnel axis direction. It is the structure which is connected and fixed sequentially.

  As shown in FIG. 1, invert concrete 1a is usually placed on the inner surface of the bottom of the tunnel T in which the segment 1 is laid as described above, and the interior material 2 is formed on the inner surface of the segment above the invert concrete 1a. A refractory material 3 having FIG. 1 shows a state in which a refractory material 3 with an interior material 2 is laid in order from the bottom on the inner peripheral surface of the upper left segment of the invert concrete 1a.

  As shown in FIGS. 4A and 4B, an insert nut 4 is embedded in advance at a predetermined position on the inner surface of each segment 1. In the illustrated embodiment, the circumference of the arc-shaped segment 1 is embedded. Six rows of insert nuts 4 are embedded in the direction and three rows in the width direction (tunnel axis direction).

Moreover, although the material of the said interior material 2 and the refractory material 3, the joining method of both, etc. are appropriate, in this embodiment, as shown in FIG. 5, on the surface of the refractory material 3 which consists of board | plate materials, such as a calcium silicate and a ceramic, An interior material 2 made of an aluminum-plated enameled steel plate is integrally attached with an adhesive, and the aluminum-plated enameled steel plate is composed of a steel plate 2a such as iron or stainless steel, an aluminum-plated layer 2b, and an enamel layer 2c. . In the figure, reference numeral 2d denotes an adhesive tape made of aluminum or the like attached to the edge of the interior material 2 made of the above-mentioned aluminum-plated enameled steel sheet, if necessary.

In the present embodiment, the interior material 2 and the refractory material 3 are formed in a horizontally long rectangular shape as shown in FIG. 2, and the length in the tunnel axis direction (left and right direction in FIG. 2C) is the segment 1. The length in the circumferential direction of the tunnel is substantially equal to the circumferential arrangement pitch (interval) of the insert nuts 4 embedded in the segment 1.

  The refractory material 3 with the interior material 2 is configured to be attached to the inner surface of the segment 1 as a tunnel lining as shown in FIG. 3 via a spacing metal fitting 5 or the like. The spacing metal fitting 5 is shown in FIG. As shown, the mounting base portion 5a having a mounting hole 50 for the insert nut 4 and opposing pieces 5b and 5c provided integrally and vertically at both upper and lower side edges of the base portion 5a have a substantially U-shaped cross section. It is the structure which provided the insertion piece 5d which protrudes upwards, and the insertion piece 5e which protrudes below in the edge part on the opposite side to the base 5a of both the opposing pieces 5b * 5c while forming.

  In this embodiment, the upper insertion piece 5d is provided over the entire length in the longitudinal direction of the upper opposing piece 5b, and the lower insertion piece 5e has a predetermined interval on both longitudinal sides of the lower opposing piece 5c. A presser piece 5f is provided between the plug-in pieces 5e and 5e. The presser piece 5f and both insertion pieces 5e and 5e are provided by being shifted in the thickness direction thereof, and are fixed by sandwiching a locking fitting 7 described later between the pieces 5f and 5e and 5e. It is.

  The spacing metal fitting 5 is configured to be attached to the inner surface of the segment 1 by inserting a bolt 6 through an attachment hole 50 provided in the base portion 5a and screwing it into the insert nut 4. The attachment hole 50 is long in the vertical direction. It is formed in a long hole shape. On the other hand, on both the upper and lower sides on the back side (segment side) of the refractory material 3, there are provided locking metal fittings 7 for engaging the insertion pieces 5d and 5e. Are provided on each of the upper and lower sides on the back side of each refractory material 3 corresponding to the insert nuts 4 embedded in the segment 1.

  In the present embodiment, each of the locking fittings 7 is formed in a substantially strip-like shape in which both end portions in the longitudinal direction are bent in steps in the thickness direction as shown in FIG. As shown in FIGS. 3 and 4, fixing bolts 8 are inserted into holes (not shown), and the bolts 8 are attached to the rear surface of the refractory material 3 by screwing into the insert nuts 9 embedded in the refractory material 3 in advance. It is a configuration.

  As shown in FIG. 6, a slit-shaped gap S is formed between the middle portion in the longitudinal direction of each of the locking fittings 7 and the refractory material 3. By inserting 5d and 5e, the latching metal fitting 7 is engaged and held by the interval holding metal fitting 5 as shown in FIG. Further, the lower insertion pieces 5e and 5e are configured to sandwich the locking metal fitting 7 from both sides in the thickness direction with the presser piece 5f provided therebetween.

  Further, as shown in FIG. 3 (a), the interval holding metal 5 has a substantially U-shaped recess 51 formed by the mounting base 5a and the opposing pieces 5b and 5c, in the vertical direction (tunnel circumferential direction). The fireproof material 3 with the interior material adjacent thereto is arranged at the joint position (joint position or butting position), and the belt-shaped flame entrainment prevention material 10 is provided in the recess 51 to provide the interior material. The gap between the refractory materials 3 and 3 is closed.

  As the flame entrainment prevention material 10, any material may be used as long as it has good fire resistance. For example, rock wool, ceramic blanket, or a laminate of both may be used. In addition, as a method of fixing the flame entrainment prevention material 10 to the refractory material 3 or the interval holding metal fitting 5 or both, bonding or other appropriate methods may be used. If an elastic material is used, it is inserted into the recess 51 in a slightly compressed state. It is possible to fix the refractory material 3 tightly. In the illustrated example, a flame entrapment prevention material 10 similar to the above is also provided between the refractory materials 3 and 3 and the segment 1 at the joint positions of the refractory materials 3 and 3 adjacent in the tunnel axis direction. ing.

In constructing the fireproof interior structure constructed as described above, the insert 1 is embedded in advance in a factory or the like, and the segment 1 is formed in a predetermined shape, and the interior material 2 is bonded to the surface with an adhesive . The refractory material 3 adhered in advance, and the interval holding metal fitting 5 and the locking metal fitting 7 which are similarly formed into a predetermined shape at a factory or the like are carried into the construction site. And the latching metal fitting 7 is previously attached to the up-and-down both sides of the refractory material 3 which stuck the said interior material 2, The latching metal fitting 7 can also be assembled | attached beforehand in a factory etc.

  Then, after the assembly and installation work of the segment 1 on the inner surface of the tunnel T and the placement work of the invert concrete 1a are completed, the refractory material 3 with the interior material 2 is sequentially placed on the inner surface of the segment above the invert concrete 1a. For example, as shown by the arrows in FIG. 1, the work may be performed by laying refractory materials 3 in order from the bottom to the top of both sides of the tunnel.

  At that time, the refractory material 3 with each interior material 2 fixes the lower locking bracket 7 to the segment 1 via the lower spacing bracket 5 and then connects the upper locking bracket 7 to the upper spacing bracket. In this case, the interval holding metal 5 is assembled to the segment 1 in advance and the engaging piece 7 is engaged with the insertion pieces 5d and 5e of the interval holding metal 5, Alternatively, the interval holding metal 5 may be fixed to the segment 1 after the insertion pieces 5 d and 5 e of the interval holding metal 5 are engaged with the locking metal 7.

  FIG. 7 shows an example. First, as shown in FIG. 7A, the lower locking metal fitting omitted in the drawing of the refractory material 3 with the interior material 2 is engaged with the lower spacing holding metal 5. In the state of being held, the downward insertion piece 5e of the upper gap holding metal 5 is engaged with the upper metal fitting 7 as indicated by the arrow in the figure, and the gap holding metal 5 is as shown in FIG. Are attached to the insert nut 4 embedded in the segment 1 with a bolt 6 or the like. Next, after assembling the flame entrainment prevention material 10 in the recess 51 of the spacing member 5, the locking member provided on the lower side of the upper refractory material 3 on the upward insertion piece 5d of the spacing member 5. 7 is engaged. In this way, the refractory material 3 with the interior material 2 may be attached in order from the bottom.

  In addition, when using a flexible material as the above-described flame entrainment prevention material 10, if either one of the upper and lower refractory materials 3 is not attached to one interval holding bracket 5, As shown in FIG. 7C, the attached refractory material 3 can be easily mounted even when the refractory material 3 protrudes into the recess so as to block a part of the opening opposite to the segment 1 of the recess 51. As shown in the figure, even if there are bolts 6 or the like in the recess 51, there is no problem if the flexible flame entrainment material is mounted in a compressed state.

  On the other hand, when a hard material is used as the flame entrainment prevention material 10 and cannot be mounted after the refractory material 3 with any one of the interior materials 2 is attached to the spacing member 5, the refractory material 3 It is only necessary to attach the flame entrainment prevention material 10 before mounting, and when the flame entrainment prevention material 10 is attached, there is a possibility that it may interfere with the bolt 6 or the like or the bolt 6 cannot be screwed in. A part of the flame entrainment prevention material 10 may be excised or separated.

  After laying the refractory material 3 with the interior material 2 in the tunnel circumferential direction as described above, the refractory material 3 with the interior material 2 is also laid in the tunnel digging direction, that is, the tunnel axis direction. At that time, it is preferable to provide the flame entrainment prevention material 10 between the refractory materials 3 and 3 adjacent to each other in the tunnel axis direction as shown in FIGS. The means for fixing the flame entrainment prevention material 10 is appropriate. For example, it may be fixed to the inner surface of the segment 1, the outer surface of the refractory material, or both surfaces with an adhesive or the like.

Or more in the present invention as the surface to the anchor fitting 7 provided interior material 2 vertically sides of the rear side of the refractory material 3 of interior material with which adhered with adhesive material, spacing the anchor fitting 7 The interior material 2 and the refractory material 3 can be easily attached in a single step by simply inserting the insertion pieces 5d and 5e of the holding metal fitting 5 in sequence and repeating the operation of bolting the interval holding metal fitting 5. At that time, it is not necessary to insert the hand between the segment 1 and the refractory material 3 (usually it is often difficult to insert a hand), and the workability is good and easy. You can work quickly.

  Moreover, since the said interior material 2 and the refractory material 3 are the structures laid in the segment inner surface via the space | interval holding | maintenance metal fitting 5, the latching metal fitting 7, etc., the refractory material 3 with the interior material 2, the segment 1, and the refractory materials, It is indirectly engaged and held via the spacing metal fitting 5 and the locking metal fitting 7, and the insertion pieces 5 d and 5 e of the spacing metal fitting 5 are slit-like gaps S between the locking metal fitting 7 and the refractory material 3. Therefore, even when there is a movement in the segment 1 due to an earthquake or the like, the individual refractory materials individually follow the movement, so that they are not peeled off or damaged. Therefore, it is also excellent in earthquake resistance.

  Furthermore, when a fire occurs in the tunnel, even if there is a gap in the joint position between the refractory materials 3 and 3 with the interior material 2 adjacent to the top and bottom, the flame entrainment arranged along the joint position The prevention material 10 prevents a flame from entering the segment side, and prevents the metal fittings 5 and 7 and the segment 1 from being deteriorated by a flame or heat. Even if the refractory material 3 with the interior material 2, the spacing metal fitting 5, the locking metal fitting 7, etc. are thermally expanded due to a fire, the movement of the refractory material 3 is not restricted by these metal fittings. The material 2 and the refractory material 3 are not deformed or cracked. Therefore, since the fire resistance and the interior function can be maintained well, there are advantages such as high reliability and durability.

  In addition, although the said embodiment was applied to the tunnel which laid the lining segment 1 in the tunnel inner surface, it can be applied also to the tunnel which laid concrete for lining directly in the tunnel inner surface. The insert nut 4 for attaching the spacing metal fitting 5 may be embedded when placing the above-mentioned concrete for lining, and an anchor or the like is provided instead of the insert nut at the time of placing or after placing. You may do

The refractory material 3 is a ceramic refractory plate or calcium silicate plate having a thickness of about 27 mm and a mass of about 27 kg / m ² . a material obtained by bonding the aluminum plating enameling steel sheet 4mm weight about 3 kg / m ^2, was attached as FIG. 1 to FIG. 3 to the tunnel inner surface via the space holding bracket 5 and the locking bracket 7 such as the It was confirmed that it could be installed easily and securely and there was no problem in strength.

  As described above, according to the fireproof interior structure of a tunnel according to the present invention, the fireproof material and the interior material can be easily attached at the same time by one construction, and even if the tunnel lining inner surface has unevenness, a curve or the like. In addition, since the interior material is provided on the surface of the refractory material, it is possible to use a relatively thin and light interior material, and there is no need to provide a hardware for attaching the interior plate, etc. Therefore, it is possible to provide a fireproof interior structure with good workability that combines the fireproof performance of the tunnel and the interior effect.

The cross-sectional view of the tunnel which shows the construction state of the refractory material attachment structure by this invention. (A) is a partial expanded sectional view of the said refractory material attachment structure. (B) is a development view of the inner surface side. (C) is cc sectional drawing in (b). (A) is a further expanded longitudinal cross-sectional view of the said refractory material attachment structure. (B) is a partially enlarged view of the inner surface side. (C) is a cross-sectional plan view of a part thereof. (A) is a side view of a segment. (B) is an inside view thereof. The front view which shows the structure of an interior material and a refractory material. The perspective view which shows the assembly | attachment point of a space | interval holding | maintenance metal fitting and a latching metal fitting. (A)-(c) is explanatory drawing which shows the construction point of the said refractory material attachment structure. The perspective view which shows the construction point of the said refractory material attachment structure.

Explanation of symbols

1 segment 1a invert concrete 2 interior material 3 refractory material 4, 9 insert nut 5 interval holding metal 5a mounting base 5b, 5c opposing piece 5d, 5e insertion piece 5f holding piece 6 mounting bolt 7 locking bracket 8 fixing bolt 10 flame Anti-rolling material T Tunnel S Clearance

Claims (1)

An interior material made of an aluminum-plated enameled steel sheet in which a steel plate such as iron or stainless steel, an aluminum plating layer, and an enamel layer is laminated in order is formed to be approximately the same size as the refractory material 3 and bonded to the surface of the refractory material The refractory material is attached to the upper and lower sides of the refractory material on the back side of the refractory material with the interior material facing the tunnel space side, and the engagement member. The above-mentioned interior material and refractory material are configured to be attached to the inner surface of the tunnel lining segment via a gap retaining bracket having a substantially U-shaped cross section provided on the upper and lower opposing pieces. The length of the tunnel axis is substantially the same as the length of the segment in the tunnel axis direction, and the interval holding bracket is attached to an insert nut embedded in the segment at a predetermined arrangement pitch in the circumferential direction. In the U-shaped recess, a flame entrainment prevention material that closes the gap between the refractory materials adjacent in the tunnel circumferential direction is provided, and the flame entrainment prevention material that closes the gap between the refractory materials adjacent in the tunnel axial direction A fireproof interior structure of a tunnel characterized by being interposed between a material and the segment .

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