JP3648524B2 - Fireproof plate mounting structure on the inner surface of tunnel lining - Google Patents

Description

  The present invention relates to a fireproof plate mounting structure on the inner surface of a tunnel lining such as a shield tunnel.

  Conventionally, for example, in a shield tunnel, a concrete segment is generally used as a lining material for the inner surface of the tunnel, and recently, this type of shield tunnel is often required to have a fireproof structure. As the fireproof structure, for example, a method of forming a fireproof film by spraying and applying a fireproof material directly to the inner surface of the segment as in Patent Document 1 below, or a stud bolt embedded in an insert nut previously embedded in the segment as in Patent Document 2. A method of directly attaching the fireproof plate to the inner surface of the segment by screwing has been proposed.

  However, as in the former case, the one that sprays and applies a refractory material has a problem that dust is generated during the operation, thereby deteriorating the working environment in the tunnel. In addition, as a fireproof structure used for shield tunnels, etc., it is necessary to consider not only fireproof performance but also seismic performance, but as in the former case, a fireproof material is directly sprayed on the inner surface of the segment to form a fireproof film, When the refractory plate is attached directly to the inner surface of the segment with bolts as in the latter case, even if the segment moves slightly due to vibrations caused by earthquakes, there is a risk that the refractory coating or the refractory plate will crack or peel off or be damaged. was there.

  When cracks, delamination, damage, etc. occur in the fireproof coating or fireproof plate in this way, there is a problem that the fireproof performance is remarkably lowered. In addition, when laying the refractory plates against each other, it is unavoidable to create a gap between adjacent refractory plates, and even from a very small gap, depending on the momentum of the fire in the event of a fire, There was a problem that a flame was directly blown onto the surface of the segment to deteriorate the concrete segment, or the quality of the segment deteriorated and caused great damage.

JP-A-8-74497

JP 2001-311395 A

  The present invention has been proposed in view of the above-mentioned problems, and can satisfy both fire resistance and earthquake resistance at the same time, and can satisfactorily prevent flame intrusion from the gap between adjacent fire plates. An object of the present invention is to provide a fireproof plate mounting structure on the inner surface of a tunnel lining.

  In order to achieve the above object, the fireproof plate mounting structure according to the present invention has the following configuration. In other words, the locking metal fittings provided on the upper and lower sides of the fireproof plate formed in a panel shape are engaged with the interval holding metal fittings attached to the inner surface of the tunnel lining segment, and a predetermined interval is provided on the inner surface of the segment. A fireproof plate mounting structure on the inner surface of the tunnel lining for mounting and supporting the fireproof plate, wherein the spacing holding metal includes at least a recess opening on the fireproof plate side and an insertion piece protruding up and down across the recess A plurality of refractory plates are held in the circumferential and axial directions of the tunnel by inserting and engaging each of the upper and lower insertion pieces with locking brackets provided on the lower and upper sides of the refractory plate. A belt-like flame entrainment preventive material that is attached to and supported by the segment via a metal fitting and closes the joint of the refractory plates adjacent in the vertical direction is provided along the seam position. Characterized in that so as to positioned and held in the recess of the retaining bracket.

    In the present invention, by inserting the insertion pieces of the spacing metal fittings into the locking metal fittings of the fireproof plate, it is possible to construct the fireproof plates by stacking them from the bottom to the top, so that the workability is good. In addition, the refractory plate can be floated and attached to the segment, that is, a space can be provided between the segment and the refractory plate, so that even if the segment or the refractory plate moves, each refractory plate follows the movement. It is possible to prevent peeling, deformation, breakage and the like.

  Furthermore, while the gap between the fireproof plates adjacent in the vertical direction is closed with a flame entrainment material, it is possible to lay the flame entrainment material between the fireproof plates adjacent in the left-right direction for each roll of fireproof plate construction. Therefore, by doing this, it is possible to prevent a flame from spreading around the back of the fireproof plate and spreading when a fire occurs. That is, while allowing the movement of each refractory plate to some extent, it is possible to accurately prevent a flame from entering through the gap between adjacent refractory plates when a fire occurs.

  Hereinafter, the present invention will be specifically described based on embodiments shown in the drawings. 1 to 3 show an embodiment of a fireproof plate mounting structure on the inner surface of a tunnel lining according to the present invention, and FIG. 1 is a cross-sectional view of the tunnel in a state where the fireproof plate mounting structure according to the present invention is being constructed. 2 (a) is an enlarged view of a part thereof, FIG. 2 (b) is an inner surface view thereof, FIG. 2 (c) is a sectional view taken along the line cc in FIG. 2 (b), and FIGS. FIG. 3 is an enlarged view of a part of FIGS. 2 (a) to 2 (c).

  In the figure, 1 is a concrete tunnel lining segment laid on the inner surface of the tunnel T. The segment 1 is formed in an arc shape as shown in FIG. 1 and FIG. The segments 1 are sequentially arranged in the circumferential direction and the entire inner surface of the tunnel is covered while being sequentially added in the tunnel axis direction, and the adjacent segments are sequentially connected and fixed by a connecting bolt or the like omitted in the drawing. is there.

  As shown in FIG. 1, invert concrete 2 is usually placed on the inner surface of the bottom portion of the tunnel T in which the segment 1 is laid as described above, and the refractory plate 3 is laid on the inner periphery of the segment above the invert concrete 2. . FIG. 1 shows a state in which a refractory plate 3 is laid in order from the bottom on the inner peripheral surface of the upper left segment of the invert concrete 2.

  As shown in FIGS. 4 (a) and 4 (b), insert nuts 4 are embedded in advance in predetermined positions on the inner surface of each segment 1, and in the present embodiment, in the circumferential direction of the arc-shaped segment 1 Three rows of insert nuts 4 are embedded in six rows in the width direction (tunnel axis direction).

  Moreover, although the material of the said refractory board 3 is appropriate, a calcium silicate board or a ceramic board | plate material etc. can be used, for example. The size and shape of the refractory plate 3 are also appropriate. In the present embodiment, the refractory plate 3 is formed in a horizontally long rectangular shape as shown in FIG. 2, and in the tunnel axis direction (left and right direction in FIG. 2C). The length is substantially the same as the length of the segment 1 in the width direction, and the length in the circumferential direction of the tunnel is formed to be approximately the same as the circumferential arrangement pitch (interval) of the insert nuts 4 embedded in the segment 1.

The refractory plate 3 is configured to be attached to the inner surface of the segment 1 via a spacing metal fitting 5 or the like as shown in FIG. 3, and the spacing metal fitting 5 is a mounting hole for the insert nut 4 as shown in FIG. 50, and the opposing pieces 5b and 5c that are provided at the upper and lower side edges of the base 5a so as to be bent integrally with each other at right angles, and are formed in a substantially U-shaped cross section. 5c is provided with an insertion piece 5d protruding upward and an insertion piece 5e protruding downward at the end opposite to the base 5a. 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 by inserting a bolt 6 through an attachment hole 50 provided in the base portion 5a and screwing it into the insert nut 4 of the segment 1, and the attachment hole 50 is a long hole that is long in the vertical direction. It is formed in a shape. On the other hand, on both the upper and lower sides on the back side (segment side) of the fireproof plate 3, there are provided locking metal fittings 7 for engaging the insertion pieces 5d and 5e. Are provided on both upper and lower sides on the back side of each refractory plate 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, a fixing bolt 8 is inserted into a hole (not shown), and the bolt 8 is screwed into an insert nut 9 embedded in the fireproof plate 3 in advance and attached to the fireproof plate 3. is there.

  As shown in FIG. 5, 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 plate 3, and the spacing piece 5 is inserted into the gap S. 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). Are arranged at the joint position (joint position or butting position) of the refractory plates 3 and 3 adjacent to the refractory plates 3 and 3, and the refractory plate 3. The gap between the three 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 plate 3 or the spacing metal fitting 5 or both, bonding or other appropriate methods may be used, but if an elastic material is used, it is inserted into the recess 51 in a slightly compressed state. It is also possible to fix the refractory plate 3 in close contact. In the illustrated example, a flame entrapment prevention material 10 similar to the above is also provided between the refractory plates 3 and 3 and the segments 1 at the joint positions of the refractory plates 3 and 3 adjacent in the tunnel axis direction. ing.

  In constructing the refractory plate mounting structure configured as described above, the insert nuts 4 and 9 are embedded in advance at a factory or the like, and the segment 1 and the refractory plate 3 are respectively formed in a predetermined shape, and similarly the factory or the like. Then, the interval holding metal 5, the locking metal 7, etc. formed into a predetermined shape are carried into the construction site. And the latching metal fitting 7 is previously attached to the upper and lower sides of the refractory plate 3, and the latching metal fitting 7 can be assembled in advance at a factory or the like.

  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 2 are completed, the fireproof plate 3 is sequentially laid on the inner surface side of the segment above the invert concrete 2. For example, the work may be performed by laying refractory plates 3 sequentially from the bottom to the top of both sides of the tunnel as indicated by arrows in FIG.

  At that time, each fireproof plate 3 is fixed to the segment 1 with the lower locking metal fitting 7 via the lower spacing metal fitting 5, and then the upper locking metal fitting 7 is connected to the segment via the upper spacing metal fitting 5. In this case, the interval holding metal 5 is assembled to the segment 1 in advance, and the locking metal 7 is engaged with the insertion pieces 5d and 5e of the interval holding metal 5, or the interval holding metal 5 The spacing piece 5 may be fixed to the segment 1 after the insertion pieces 5 d and 5 e are engaged with the locking piece 7.

  FIG. 6 shows an example. First, as shown in FIG. 6A, the lower locking metal fitting omitted in the drawing of the refractory plate 3 is engaged 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 7 as shown by the arrow in the figure, and the spacing metal fitting 5 is embedded in the segment 1 as shown in FIG. Attach to the inserted nut 4 with a bolt 6 or the like. Next, after assembling the flame entrainment preventive member 10 in the recess 51 of the spacing member 5, the locking member provided on the lower side of the upper fireproof plate 3 on the upward insertion piece 5d of the spacing member 5. 7 is engaged. In this way, the fireproof plate 3 may be attached in order from the bottom.

  In addition, when using a flexible material as the above-mentioned flame entrainment prevention material 10, if either one of the upper and lower refractory plates 3 is not attached to one interval holding bracket 5, The attached refractory plate 3 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 as shown in FIG. 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, when a hard material is used as the flame entrapment prevention material 10 and cannot be mounted after one of the fireproof plates 3 is attached to the interval holding metal 5, the flame winding is performed before the fireproof plate 3 is attached. The anti-entrainment material 10 may be attached. When the anti-entrainment material 10 is attached, there is a possibility that the anti-entrainment material 10 may interfere with the bolt 6 or the bolt 6 cannot be screwed in. It is only necessary to excise a part of it or to attach it separately.

  In addition, when the fireproof plate 3 is laid sequentially from the lower part of both sides of the tunnel above the inverted concrete 2 upward as in the above embodiment, the tunnel top end may not be laid in the same manner as described above. In such a case, for example, as shown in FIG. 8, the end portions 3a of the adjacent fireproof plates 3 may be overlapped and fixed. In the case of the figure, a post-installed anchor is placed on the tunnel top end segment 1 located in the overlapping portion, and a refractory spacer 11 for maintaining a gap and the overlapping end portion 3a are sequentially placed inside the anchor. The configuration is arranged and fixed with bolts 12 and nuts 13.

  After laying the refractory plate 3 in the circumferential direction of the tunnel as described above, the refractory plate 3 is also laid in the tunnel excavation direction, that is, in the tunnel axis direction. A flame entrainment prevention material 10 may be provided between the plates 3 and 3 as shown in FIGS. 2 (b) and 2 (c). The means for fixing the flame entrainment prevention material 10 and the like are appropriate. For example, the flame entrapment material 10 may be fixed to the inner surface of the segment 1, the outer surface of the fireproof plate, or both surfaces with an adhesive or the like.

  As described above, in the present invention, the insertion pieces 5d and 5e of the distance holding metal fitting 5 are sequentially inserted into the metal fittings 7 provided on the upper and lower sides on the back side of the fireproof plate 3, and the distance holding metal fitting 5 is bolted. It is possible to easily attach the refractory plate 3 simply by repeating the operation to be performed. At that time, the bolting operation is performed between the segment 1 and the refractory plate 3 (usually, it is often difficult to put a hand). There is no need to insert a hand into the work, workability is good, and work can be done easily and quickly.

  In addition, since the refractory plate 3 is laid on the inner surface of the segment via the interval holding metal 5 and the locking metal 7, the segment 1, the refractory plate 3 and the fire proofing plate are connected to each other. Further, the insertion pieces 5d and 5e of the interval holding metal 5 can be slid in the slit-shaped gap S between the locking metal 7 and the fireproof plate 3. Therefore, even when there is a movement in the segment 1 due to an earthquake or the like, each fireproof plate individually follows the movement and is not peeled off or damaged. Therefore, it is also excellent in earthquake resistance.

  Further, when a fire occurs in the tunnel, even if there is a gap in the joint position between the upper and lower adjacent refractory plates 3 and 3, the flame entrainment material 10 arranged along the joint position causes a segment. A flame is prevented from entering the side, and the metal fittings 5, 7 and the segment 1 are prevented from being deteriorated by a flame or heat. In addition, even if the fireproof plate 3, the interval holding metal fitting 5, the locking metal fitting 7, etc. are thermally expanded due to a fire, the movement of the fireproof plate 3 is not restricted by these metal fittings, and the fireproof plate 3 is deformed. Or break. Therefore, since the fire resistance can be maintained well, the reliability is high.

The cross-sectional view of the tunnel which shows the construction state of the fireproof board attachment structure by this invention. (A) is a partial expanded sectional view of the said fireproof board 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 fireproof board 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. FIG. (A)-(c) is explanatory drawing which shows the construction point of the said fireproof board attachment structure. The perspective view which shows the construction point of the said fireproof board attachment structure. Sectional drawing which shows the example of fireproof board attachment to a tunnel top end part.

Explanation of symbols

1 Segment 2 Inverted Concrete 3 Fireproof Plates 4 and 9 Insert Nuts 5 Spacing Bracket 5a Mounting Base 5b 5c Opposing Pieces 5d and 5e Insertion Pieces 5f Pressing Pieces 6 Mounting Bolts 7 Locking Brackets 8 Fixing Bolts 10 Flame Prevention Material T Tunnel S Clearance

Claims (1)

Engage locking brackets provided on the upper and lower sides of the fireproof plate formed in a panel shape with the interval holding brackets attached to the inner surface of the tunnel lining segment, and keep a predetermined interval on the inner surface of the segment. And a fireproof plate mounting structure on the inner surface of the tunnel lining that supports and supports the fireproof plate,
The spacing metal fitting has at least a recess opening on the fireproof plate side, and an insertion piece projecting up and down across the recess, and the upper and lower insertion pieces are provided on the lower and upper sides of the fireproof plate, respectively. A plurality of refractory plates are attached to and supported by the segment via the spacing metal fittings in the tunnel circumferential direction and the axial direction by inserting and engaging with the locking metal fittings, and the joints of the refractory plates adjacent in the vertical direction are closed. A flame-shaped flame wrap prevention material is provided along the seam position, and the flame wrap prevention material is positioned and held in the recess of the spacing metal fitting. Plate mounting structure.

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