JP4505396B2 - Tunnel fireproof interior structure and construction method - 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, and a construction method thereof.

  Conventionally, various construction methods have been proposed in which a refractory material is provided on the inner surface of a tunnel lining such as a lining concrete or a segment laid on the inner surface of the tunnel to protect the concrete frame from an emergency fire. 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, it is usual to lay interior materials 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 or guiding the line of sight. It is. 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 surface side of an interior finish material via a partition plate, and a bolt through which the interior finish material and the refractory material layer are inserted is covered (structure Although it is disclosed that it is screwed and fixed to the anchor embedded in the material), it is extremely difficult to install in response to 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.

  On the other hand, in Patent Document 2, the interior board is lifted and stretched at a predetermined interval with respect to the lining, and the fireproof coating cement mortar for injection is pumped into the space between the lining surface and the interior board by a pump. This is a proposed method of injection. This type of refractory cement mortar, which normally caused clogging of the pump and material separation, should be properly fireproofed on the lining concrete on the back of the interior board by specifying the composition in Patent Document 2. Made possible.

  However, with this method, only a refractory material with a very specific composition suitable for pumping injection can be used, and the installation work of the interior panel and the injection operation of the refractory material need to be performed in separate steps at the same location. And the work period required for the work becomes longer. In addition, a mortar supply port is formed through the interior panel, and mortar is injected into the narrow construction space between the inner walls of the tunnel. It is extremely difficult to perform construction and injection management so that the mortar does not leak and the construction target space is filled without a gap.

  In addition, the interior panel must be firmly fixed to the lining so that it can withstand the pressure injection in the construction target space. It will push out towards the. Also, the injection of refractory cement mortar makes the interior panel, refractory material, and lining concrete become one piece, so in the unlikely event that the interior panel is partially broken due to an earthquake or accident, the interior panel is replaced for repair. Installation work and pouring work of refractory cement mortar must be performed extensively.

Japanese Patent Laid-Open No. 11-294098 JP 2004-224622 A

  The present invention has been proposed in view of the above problems, and an object thereof is to provide a tunnel fireproof interior structure capable of efficiently, easily and inexpensively performing fireproof construction and interior material installation work, and a construction method thereof. And

  In order to achieve the above object, the tunnel refractory interior structure and its construction method according to the present invention have the following configurations. That is, in the tunnel fireproof interior structure according to the present invention, the lower part of the inner surface of the tunnel service space is the line-of-sight guidance area, and the upper part is the upper area, and the partition member is continuous in the tunnel axis direction between the line-of-sight guidance area and the upper area. In addition to forming a fireproof material layer for construction in the upper region above the partition member, a fireproof interior plate made of a fireproof material having an interior function on the surface is laid in the line-of-sight guidance region. And

  Further, the construction method of the tunnel fireproof interior structure according to the present invention is such that the lower part of the inner surface of the tunnel service space is the line-of-sight guidance area and the upper part is the upper area, and the partition member is disposed between the line-of-sight guidance area and the upper area And a step of forming a refractory material layer applied on site in the upper region above the partition member, and a refractory interior plate made of a refractory material having an interior function on the surface in the line-of-sight guidance region. The partition member is formed when the on-site construction refractory material layer is formed at least before the on-site construction refractory material layer formation step. As a guide, the refractory material is prevented from flowing down below it.

  In general, in the method of laying factory-produced refractory plates all around the inner surface of the tunnel lining, the refractory plates must be allocated according to the tunnel cross-sectional shape that changes as needed due to the undulations and curves of the tunnel. Normally, it is necessary to lay the tunnel lining on the inner surface of the tunnel lining from the bottom on the left and right sides, and install a fireproof plate for adjustment at the top to complete the entire circumference covering. . However, according to the present invention, the installation of the refractory interior board is limited to the lower part of the tunnel necessary for the line-of-sight guidance, and the upper refractory material layer is on-site construction, so the above troublesome adjustment work at the top end is not necessary It becomes.

  Conventionally, in the construction method in which a fireproof material layer applied on site is formed on the entire inner surface of the tunnel lining by means of spraying or coating, it has been necessary to carry out installation work for the interior panel separately from the fireproofing work. According to this, by using the fireproof interior plate, the conventional fireproof plate installation and interior plate installation work can be efficiently performed in one construction. In other words, when trying to cover the entire inner surface of a tunnel lining with fireproofing, either the construction of a fireproof plate or the construction of a fireproof material layer is selected on the spot, while the interior plate installation work is In the present invention, in the present invention, a fireproof interior plate is laid in the line-of-sight guidance area where the interior is required, so that the work corresponding to the installation of the refractory material and the interior plate is performed in a single laying operation. In the other upper region, the fireproof material layer can be installed on-site, so that efficient and practical fireproof interior construction can be carried out easily and quickly.

  Moreover, in the present invention, before forming the refractory material layer for on-site construction, a refractory material layer for on-site construction such as spraying or coating is formed by providing a partition member at the boundary between the line-of-sight guidance region and the upper region. The fireproof material will not fall into the line-of-sight guidance area and will not interfere with the mounting of the holding brackets etc. that hold the fireproof interior panel, and if the fireproof interior panel is laid first, There is no fear that the refractory material applied on site adheres and stains the surface of the interior board, and in any of the above cases, efficient work is possible. Moreover, in this invention, when installing a fireproof interior board, work can be advanced simultaneously in each of the left side wall and right side wall of a tunnel cross section, and said work can be performed in a short-term process.

  Hereinafter, the present invention will be specifically described based on embodiments shown in the drawings. FIG. 1 is a cross-sectional view of a tunnel showing an embodiment of a fireproof interior structure according to the present invention, FIG. 2A is an enlarged view of a part thereof, FIG. 1B is an inner view thereof, and FIG. FIG. 3 (a) and (b) are enlarged views of a part of FIGS. 2 (a) and (b), and FIGS. 4 (a) and (b) are FIG. 3 (a). ) And (b) are partly enlarged views, and FIG. 4 (c) is a cross-sectional plan view of (b).

  The present embodiment is applied to a shield tunnel T using a concrete segment (RC segment) 1 as a tunnel lining. The segments 1 are formed in an arc shape as shown in FIGS. 1 and 2, and are sequentially arranged in the circumferential direction of the tunnel inner surface which has been excavated, and are arranged on the entire inner surface of the tunnel while being successively added in the tunnel axis direction. The adjacent segments 1 and 1 are connected and fixed by a connecting bolt or the like omitted in the drawing.

  Invert concrete (floor slab) 1a as shown in FIG. 1 is usually placed at the bottom of the tunnel T in which the segment 1 is laid as described above, and the tunnel space above the tunnel concrete space T1 is used as the tunnel service space T1. use. And the range of a predetermined height from the upper surface of the invert concrete 1a located at the lower part of the inner surface of the tunnel service space T1, usually within the range of about 2500 to 3500 mm as the line of sight guidance area R1, the line of sight guidance area R1, The partition member 4 is continuously provided in the tunnel axis direction between the upper region R2 above the upper region R2 and the fire-resistant material layer 3 applied in the field is formed in the upper region R2 above the partition member 4. A fireproof interior plate 2 made of a fireproof material having an interior function is laid on the surface of the line-of-sight guidance region R1.

  Although the material and construction method of the refractory material layer 3 for the construction in the field are appropriate, in this embodiment, a refractory material having fluidity obtained by appropriately adding a quick setting material to a slurry-like refractory material, It is formed and solidified on the inner surface of the segment 1, which is the inner surface of the tunnel service space T1, by means of spraying or coating to a thickness of about 30 to 40 mm. The thickness of the refractory material layer 3 is appropriate, and when the refractory material layer 3 is formed, a reinforcing core material (not shown) such as a wire mesh is previously laid on the inner surface of the segment 1 and then the above-mentioned When the spraying operation is performed, a high-strength refractory material layer in which a reinforcing core material is embedded can be obtained, and peeling of the refractory material layer can be prevented.

  Moreover, when constructing the refractory material layer 3 applied in the field in the upper region R2 as described above, the refractory material may flow down to the line-of-sight guidance region R1 side by using the partition member 4 as a guide. If the fireproof interior board 2 is first laid in the line-of-sight guidance region R1, the fireproof interior board 2 can be prevented from being soiled or damaged. Although the structure of the partition member 4 is appropriate, the partition member 4 of the present embodiment includes a backing material 40 made of a refractory material, as shown in FIG. 5 in which a part of FIG. Insert nut 1n embedded in the structure of segment 1, etc., receiving plate 43 that is fastened to the anchor with bolts 41, nuts 42, etc., parting plate 44 that supports the uppermost end of the refractory interior board 2, and its fixing nut 45, etc. It becomes more.

  The fireproof interior plate 2 laid in the line-of-sight guidance region R1 is appropriately formed of a material and a forming method as long as it is a fireproof material having an interior function on the surface. In this embodiment, as shown in FIG. A decorative layer 21 made of an aluminum-plated enameled steel plate is integrally bonded with an adhesive or the like on the surface of a plate-like refractory material 20 such as calcium or ceramic. In particular, in the case of the figure, the decorative layer 21 has a three-layer structure including a steel plate 21a made of iron or stainless steel, an aluminum plating layer 21b, and an enamel layer 21c.

  The size and shape of the fireproof interior plate 2 are also appropriate. In the present embodiment, the fireproof interior plate 2 is formed in a horizontally long rectangular shape as shown in FIGS. 2 and 3, and in the tunnel axis direction (FIG. 2 (c)). The length in the left-right direction) is substantially the same as the length in the width direction of the segment 1, and the length in the circumferential direction of the tunnel is formed substantially equal to the circumferential arrangement pitch (interval) of the insert nuts 1n embedded in the segment 1 in advance. ing.

  Furthermore, in this embodiment, the fireproof interior plate 2 is constructed so as to be lifted and stretched at a predetermined interval on the inner surface of the segment 1 via the interval holding metal fitting 5 as shown in FIG. An attachment hole 50 for the segment 1 is provided in the base portion 5a of the metal fitting 5. In the present embodiment, the mounting hole 50 is formed in the shape of a long hole that is long in the vertical direction as shown in FIG. 6, and a bolt 6 is inserted into the mounting hole 50, and the bolt 6 is inserted as shown in FIG. The interval holding metal fitting 5 is attached to the inner surface of the segment 1 by being screwed into an insert nut 1 n embedded in the segment 1.

  Further, as shown in FIG. 6, the spacing metal fitting 5 includes a base portion 5a having the mounting hole 50, and opposing pieces 5b and 5c which are provided at the upper and lower side edges of the substrate 5a so as to be bent integrally and at right angles. And an insertion piece 5d projecting upward and an insertion piece 5e projecting downward are provided at the opposite ends of the base portions 5a of the opposing pieces 5b and 5c, respectively. It is a configuration. In the present embodiment, the upper insertion piece 5d is provided over the entire length in the longitudinal direction of the upper facing piece 5b. The lower insertion piece 5e is provided at a predetermined interval on both sides in the longitudinal direction of the lower opposing piece 5c, and the holding piece 5f has a thickness between the insertion pieces 5e and 5e. They are offset from each other in the direction.

  On the other hand, on both the upper and lower sides of the rear side (segment side) of the fireproof interior board 2, there are provided locking metal fittings 7 for engaging the insertion pieces 5d and 5e, respectively. In the form, three are provided on each of the upper and lower sides on the back side of each fireproof interior board 3 corresponding to the insert nuts 1n 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 FIG. 4, a fixing bolt 8 is inserted into a hole (not shown), and the bolt 8 is screwed into an insert nut 2 n embedded in the fireproof interior plate 2 in advance and attached to the rear surface of the fireproof interior plate 2. It is.

  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 fireproof interior plate 2, and the gap holding fitting 5 is inserted into the gap S. By inserting the pieces 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. 4 (a), the gap 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 interior plate 2 is disposed at the joint position (joint position or butting position) of the fireproof interior plate 2 adjacent to the fireproof interior plate 2, and a belt-like flame entrainment prevention material 9 is provided in the recess 51. The gap between the two is closed.

  The flame entrainment prevention material 9 is appropriate as long as it has good fire resistance. For example, rock wool, ceramic blanket, or a laminate of both can be used. In addition, as a method of fixing the flame entrainment prevention material 9 to the fireproof interior plate 2 or the spacing 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 also possible to make the fireproof interior plate 2 tightly fixed by simply doing. In the illustrated example, the same flame entrainment prevention material 9 is also provided between the fireproof interior plates 2 and 2 and the segment 1 at the joint position of the fireproof interior plates 2 and 2 adjacent in the tunnel axis direction. Is provided.

  In constructing the fireproof interior structure configured as described above, after laying the segments 1 in which the insert nuts 1n are previously embedded at the factory in advance on the inner surface of the tunnel T and performing tunnel lining, Place 1a. And the fireproof interior structure by this invention is constructed in the inner surface of the tunnel service space T1 above the invert concrete 1a, and as the process, it is a partition member between the said visual guidance area | region R1 and upper area | region R2. 4, a step of forming a refractory material layer 3 applied in the field in the upper region R 2, and a step of laying the refractory interior board 2 in the line-of-sight guidance region R 1.

  In this case, the step of providing the partition member 4 is preferably performed at least before the step of forming the refractory material layer 3 applied on site. Specifically, for example, after the partition member 4 is provided at the boundary between the line-of-sight guidance region R1 and the upper region R2, and the fireproof material layer 3 applied in the field is formed in the upper region R2, a fireproof interior is provided in the line-of-sight guidance region R1. Lay the board. Alternatively, the partition member 4 may be provided before or after the fireproof interior plate is laid in the line-of-sight guidance region R1, and finally the fireproof material layer 3 applied in the field may be formed in the upper region R2.

  FIG. 7 and FIG. 8 show an example of the construction procedure, respectively. FIG. 7 shows that the partition member 4 is first constructed at the boundary between the line-of-sight guidance region R1 and the upper region R2 as shown in FIG. After forming the refractory material layer 3 on-site construction in the upper region R2 as shown in (b), and finally laying the refractory interior board 2 in the line-of-sight guidance region R1 as shown in FIG. 8, after laying the fireproof interior plate 2 in the line-of-sight guidance region R1 as shown in FIG. 8A, the partition member 4 is constructed on the upper portion thereof as shown in FIG. In this way, the refractory material layer 3 applied in the field is formed in the upper region R2.

  The above-mentioned refractory material layer 3 constructed on site is usually formed by means of spraying or applying a fluid refractory material to the inner surface of the tunnel lining to a predetermined thickness as described above, and solidifying them. In this case, if the partition member 4 is provided before the refractory material layer 3 is formed, the refractory material having the fluidity as described above is formed in the line-of-sight guidance region R1. In the case where the fireproof interior plate 2 has been laid down in the line-of-sight guidance region R1 when it becomes a hindrance to the mounting of the interval holding metal fitting 5 or the like that flows down and holds the fireproof interior plate 2, the fireproof interior plate 2 It is possible to prevent contamination and damage.

  The partition member 4 has an appropriate structure. For example, as in the above-described embodiment, a backing material 40, a receiving plate 43 for fixing the backing material 40 to a structure insert or anchor with a bolt 41 and a nut 42, and a fireproof interior plate When the partition member 4 is constructed before laying the refractory interior board 2 as shown in FIG. The backing material 40 is fixed in advance with bolts 41, nuts 42 and a receiving plate 43, the fireproof material layer 3 and the fireproof interior plate 2 are constructed on site, and then the parting plate 44 is bolted 41 with the fixing nut 45. What is necessary is just to fix to. In that case, the refractory material layer 3 and the refractory interior board 2 which are constructed on site can be constructed separately or simultaneously.

  Further, when the fireproof interior material layer 3 is provided after the construction of the fireproof interior plate 2 and the partition member 4 as shown in FIG. 8, for example, the backing material 40 is attached to the upper end of the fireproof interior plate 2 with bolts 41. While being fixed with the nut 42 and the receiving plate 43, the fire-resistant material layer 3 applied in the field is formed above the backing material 40 and the receiving plate 43 with the parting plate 44 fixed to the bolt 41 with the fixing nut 45. do it.

  Moreover, although the construction procedure of the said fireproof interior board 2 is suitable, for example, the latching metal fitting 7 is previously attached to the upper and lower sides on the back side of the fireproof interior board 2, and on the segment inner surface side above the invert concrete 1a, What is necessary is just to attach the space | interval holding | maintenance metal fitting 5 and the fireproof interior board 2 in order toward the top from the bottom. At that time, each of the fireproof interior plates 2 fixes the lower locking metal 7 to the segment 1 via the lower distance holding metal 5 and then attaches the upper locking metal 7 via the upper distance holding metal 5. It is better to fix to the segment 1, and at that time, the interval holding metal 5 is assembled to the segment 1 in advance, and then the locking metal 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. 9 shows an example. First, as shown in FIG. 9A, the lower locking metal fitting omitted in the drawing of the fireproof interior plate 2 is engaged with and held by the lower spacing metal fitting 5. Then, the downward insertion piece 5e of the upper spacing metal fitting 5 is engaged with the upper locking metal fitting 7 as shown by the arrow in the figure, and the spacing metal fitting 5 is attached to the segment 1 as shown in FIG. It is attached to the buried insert nut 1n with a bolt 6 or the like. Next, after assembling the flame entrainment prevention material 9 in the recess 51 of the spacing metal fitting 5, the locking provided on the lower side of the upper fireproof interior plate 2 on the upward insertion piece 5 d of the spacing metal fitting 5. The metal fitting 7 is engaged. In this way, the fireproof interior board 2 may be attached in order from the bottom.

  When a flexible material is used as the above-mentioned flame entrainment prevention material 9, if either one of the upper and lower fireproof interior plates 2 is not attached to one interval holding bracket 5, As shown in FIG. 9C, the refractory interior board 2 attached to can be easily mounted even in a state of protruding into the recess so as to block a part of the opening opposite to the segment 1 of the recess 51. . Moreover, even if the bolts 6 and the like are in the recess 51 as shown in the figure, there is no problem if the flexible flame entrainment material is mounted in a compressed state.

  On the other hand, in the case where a hard material is used as the flame entrainment prevention material 9 and it is not possible to install it after attaching any one of the fireproof interior plates 2 to the interval holding metal 5, before attaching the fireproof interior plate 2. It is only necessary to attach the flame entrainment prevention material 9 to the flame, and when the flame entrainment prevention material 9 is attached, there is a possibility that it may interfere with the bolt 6 or the bolt 6 cannot be screwed in. What is necessary is just to excise a part of prevention material 9 or to isolate | separate and mount | wear. In addition, it is good to provide the flame entrainment prevention material 9 between the fireproof interior boards 2 and 2 adjacent to the tunnel axial direction as shown in FIGS. As appropriate, for example, the inner surface of the segment 1, the outer surface of the refractory material, or both surfaces thereof may be fixed with an adhesive or the like.

  As described above, the partition member 4 is provided in the tunnel axis direction between the line-of-sight guidance region R1 on both sides of the lower part of the tunnel service space T1 and the upper region above it, and the upper region above the partition member 4 A shield having a fireproof interior structure on the inner surface of the tunnel service space T1 as shown in FIG. 10 by forming the fireproof material layer 3 on site construction in R2 and laying the fireproof interior plate 2 in the line-of-sight guidance region R1. A tunnel T is obtained.

  In addition, although the said embodiment used the segment 1 made from concrete as tunnel lining, it is applicable also to the shield tunnel etc. which used the steel segment. FIG. 11 shows an example thereof. Similarly to the above-described embodiment, the predetermined height range below the inner surface of the tunnel service space T1 above the inverted concrete 1a is the line-of-sight guidance region R1, and the upper region is the upper region R2. In addition, the partition member 4 is continuously provided in the tunnel axis direction between the line-of-sight guidance region R1 and the upper region R2, and the refractory material layer 3 applied in the field is formed in the upper region R2 above the partition member 4. The fireproof interior plate 2 made of a fireproof material having an interior function is laid on the surface of the line-of-sight guidance region R1.

  As shown in FIG. 12, the steel segment 10 constituting the tunnel lining of the inner surface of the tunnel service space T1 includes a beam 11 extending in the tunnel circumferential direction and a joint plate serving as a connection surface between adjacent segments in the circumferential direction. 12, a reinforcing rib 13 for resisting a pressing force in the tunnel axial direction generated by the shield machine to take a propulsion reaction force, a support plate 14 provided radially outside the reinforcing rib 13 and the like It becomes more.

  In the case of the figure, the reinforcing ribs 13 have a configuration in which strip-shaped plate materials are arranged in the tunnel axial direction, that is, in the lateral direction, and are provided in a large number at predetermined intervals in the circumferential direction of the tunnel. Therefore, there is a gap between the reinforcing ribs 13 and 13 adjacent to each other in the tunnel circumferential direction, and there is a possibility that the refractory material may flow into the segment 10 when the above-mentioned refractory material layer 3 is formed on the site. A cement board or the like may be installed on the inner surface to prevent the inflow of the refractory material into the segment 10 or, depending on the case, the refractory material may be inflowed into the segment 10 for filling.

  Moreover, since the insert nut etc. cannot be embed | buried in the said steel segment 10 like the segment made from the said concrete, the bolt 41 for attaching the partition member 4 in the said embodiment to a segment, and the said space | interval holding | maintenance metal fitting 5 are this In the embodiment, it is attached to the reinforcing rib 13 via the adjustment fitting 60, FIG. 13 is an enlarged view of the attachment portion of the partition member 4, and FIG. 14 is an enlarged view of the attachment portion of the spacing member 5. .

  In the present embodiment, as shown in FIG. 15, the adjustment fitting 2 includes a substantially C-shaped cross-section fitting (hereinafter referred to as a C-shaped fitting) 61 formed by bending a plate material, and a substantially L-shaped cross-section fitting ( (Hereinafter referred to as L-shaped bracket) 62, and at the lower part of the C-shaped bracket 21, as shown in FIG. 15, the folded portions having different folding positions at the center and both ends in the width direction (front-rear direction in FIG. 15). The pieces 61a and 61b are provided, and one edge portion of the reinforcing rib 13 is engaged and held between the folded pieces 61a and 61b.

  Further, the L-shaped bracket 62 is attached to the upper portion of the C-shaped bracket 61 with bolts 63 and nuts 64, and is reinforced between the vertical piece 62a of the L-shaped bracket 62 and the upper folded piece 61c of the C-shaped bracket 61. The other edge of the rib 13 is engaged and held. If the nut 64 is fixed to the inner surface of the C-shaped bracket 22 in advance by welding or the like, the attaching operation becomes easy and the loss of the nut can be prevented. Further, instead of the nut 64, a female screw hole for screwing the bolt 63 into the C-shaped bracket 62 may be formed.

  A bolt 65 is attached to the adjustment fitting 2 attached to the reinforcing rib 13 as described above, and to the bolt insertion hole (not shown) formed in the attachment hole 50 and the adjustment fitting 2 in the distance holding fitting 5 of FIG. 14 is attached with a nut 66, and in the support fitting 4 of FIG. 14, the bolt 41 is inserted into a bolt insertion hole (not shown) formed in the adjustment fitting 2 and attached with a nut 66. Similarly to the nut 62, the nut 66 is fixed to the inner surface of the C-shaped bracket 22 by welding or the like in advance, or a female screw hole for screwing the bolt 65 or 41 into the C-shaped bracket 22 is formed instead of the nut 66. May be.

  Other configurations are the same as those of the embodiment shown in FIGS. 1 to 10, and the same operation and effect can be obtained. In particular, if the partition member 4 is provided before forming the refractory material layer 3 for on-site construction, a refractory material having fluidity flows down to the line-of-sight guidance region R1, or the refractory interior board 2 is already in the line-of-sight guidance region R1. When laid, it is possible to prevent the fireproof interior boards 2 from being soiled or damaged. Moreover, if the partition member 4 is provided first, the refractory material layer 3 and the refractory interior board 2 can be constructed at the same time.

  Furthermore, the present invention can also be applied to a steel shell submerged tunnel T as shown in FIG. FIG. 17 shows the construction of a fireproof material layer 3, a fireproof interior plate 2, and a partition member 4 in the same manner as in the embodiment of FIGS. 1 to 10 in the tunnel service space T1 of the buried tunnel T. Thus, the same effect as that of the above embodiment can be obtained. In particular, when installing a refractory plate in the steel shell submerged tunnel T as described above, it is difficult to align and attach the refractory plate at the upper corner where the ceiling and the side wall intersect in the tunnel service space T1. Then, the installation of the fireproof interior plate is limited to the line-of-sight guidance region R1 located on the lower inner surface of the tunnel service space T1, and the upper region R2 above it forms a fireproof material layer for on-site construction. -There are advantages such as quick installation.

  As described above, in the present invention, the partition member 4 is provided between the line-of-sight guidance region R1 at the lower inner surface of the tunnel service space T1 and the upper region R2 above it, and the upper region above the partition member 4 Since the fireproof material layer 3 for on-site construction is formed on R2 and the fireproof interior board 2 is laid on the line-of-sight guidance area R1, the fireproof interior board 2 in the line-of-sight guidance area R1 and the field construction fireproof on the top area R2 In a state where the material layer 3 is reliably partitioned by the partition member 4, the material layer 3 can be separately separately provided.

  Moreover, by using the fireproof interior panel 2 in the line-of-sight guidance region R1, a fireproof material having an interior function can be simplified in one construction work without separately constructing the fireproof material and the interior panel as in the conventional case. It can be provided reliably. Moreover, by providing the partition member 4 before forming the refractory material layer 3 for on-site construction, when forming the refractory material layer 3, the refractory material flows down to the line-of-sight guidance region R1 or has already entered the line-of-sight guidance region R1. When the fireproof interior boards 2 are laid, it is possible to prevent the fireproof interior boards 2 from being stained or damaged.

  Further, by providing a partition member 4 between the line-of-sight guidance region R1 and the upper region R2, the work of laying the fireproof interior board 2 on the line-of-sight guidance region R1 and the field construction work of the refractory material layer 3 on the upper region R2 Can be performed independently of each other, and in some cases, the above operations can be performed simultaneously.

  According to the tunnel fireproof interior structure and the construction method according to the present invention configured as described above, the ductile segment is not limited to the shield tunnel using the RC segment and the steel segment as described above, but is a composite of cast iron and concrete. It is applicable not only to precast tunnels including the above-mentioned steel shell submerged tunnels, but also to tunnels in which lining concrete is directly placed in the excavated tunnel by on-site construction. In these tunnels, the same effects as described above can be obtained.

The cross-sectional view of the tunnel which shows one Embodiment of the tunnel fireproof interior structure by this invention. (A) is a partially enlarged view of FIG. 1, (b) is an inner surface view thereof, and (c) is a cross-sectional view taken along line cc in (b). (A) And (b) is the one part enlarged view of (a) and (b). FIGS. 3A and 3B are enlarged views of a part of FIGS. 3A and 3B, and FIG. 3C is a cross-sectional plan view of FIG. The enlarged view of the partition member attaching part in FIG. The disassembled perspective view which shows the attachment structure of a fireproof interior board. (A)-(c) is explanatory drawing which shows an example of the construction process of the said fireproof interior structure. (A)-(c) is explanatory drawing which shows the other example of the construction process of the said fireproof interior structure. Explanatory drawing which shows an example of the attachment procedure of a fireproof interior board. The perspective view of the tunnel which constructed the tunnel fireproof interior structure by this invention. The cross-sectional view of the example which applied this invention to the tunnel using a steel segment. The perspective view of a steel segment. The enlarged view of the partition member attaching part in FIG. The enlarged view of the fireproof interior board attaching part in FIG. (A) is a disassembled perspective view of a fireproof interior board attaching part, (b) is a perspective view which shows the assembly | attachment state of an adjustment metal fitting. The cross-sectional view which shows an example of a steel shell submerged tunnel. The one part expanded cross-sectional view of the example which applied this invention to the said steel shell submerged tunnel.

Explanation of symbols

1 segment 1a invert concrete 2 fireproof interior plate 1n, 2n insert nut 3 fireproof material layer 4 partition member 5 spacing metal fitting 5a mounting base 5b, 5c opposing piece 5d, 5e insertion piece 5f holding piece 6 mounting bolt 7 locking metal fitting 8 Fixing bolt 9 Flame entrainment prevention material T Tunnel S Clearance

Claims (3)

  The lower part of the inner surface of the tunnel service space is the line-of-sight guidance area, and the upper part is the upper area, and a partition member is continuously provided in the tunnel axis direction between the line-of-sight guidance area and the upper area. A fireproof interior structure for a tunnel characterized in that a fireproof material layer for on-site construction is formed in an upper region, and a fireproof interior plate made of a fireproof material having an interior function is laid on the surface of the line-of-sight guidance region.   2. The tunnel fireproof interior structure according to claim 1, wherein the fireproof interior plate is floated and stretched on the inner surface of the tunnel service space with a predetermined interval through a spacing metal fitting.   The lower part of the inner surface of the tunnel service space is the line-of-sight guidance area, the upper part is the upper area, and the partition member is continuously provided in the tunnel axis direction between the line-of-sight guidance area and the upper area; A step of forming a refractory material layer applied on site in an upper region above, and a step of laying a refractory interior plate made of a refractory material having an interior function on the surface in the line-of-sight guidance region, and providing the partition member When forming the refractory material layer for on-site construction by performing the process at least before the step of forming the refractory material layer for on-site construction, the refractory material flows down below the partition member as a guide. The construction method of the tunnel fireproof interior structure characterized by not doing.

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