JP2006037490A - Fire resistant plate installing structure to steel segment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily and surely install a fire resistant plate superior in fire resistant performance without forming a bolt hole in a steel segment, in a fire resistant plate installing structure to a segment, particularly, the steel segment laid, for example, as a lining of an excavated tunnel inside surface. <P>SOLUTION: An adjusting metal fitting 2 is installed on a reinforcing rib 13 of the steel segment 1 laid in a tunnel T so as to sandwich the rib 13, and the fire resistant plate 5 is installed and supported via a locking metal fitting 4 on and by a fire resistant plate support metal fitting 3 installed on its adjusting metal fitting 2. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a refractory plate mounting structure to a segment, particularly a steel segment, which is laid as a lining on the inner surface of an excavated tunnel, for example.

  Conventionally, for example, in the event of a fire in a shield tunnel, it has been proposed to have a fireproof structure so that the lining segment is not damaged. This lining segment can be either concrete or steel (steel). For shield tunnels using concrete segments, attach fireproof plates using inserts embedded in concrete. (For example, see Patent Document 1 and Patent Document 2 below).

  On the other hand, in a steel segment (steel segment), it is not allowed to open an arbitrary bolt hole in the segment itself in terms of structure or strength. It has been proposed to spray a refractory material. However, the construction method of spraying refractory materials as described above may cause peeling when the construction environment deteriorates due to the generation of dust, etc., and the segments are displaced, and the firethickness is limited because the spraying thickness is limited. There are problems such as inferior fire resistance compared to the construction method. Also, the surface of the steel segment is like a waffle, so spraying is extremely difficult.

JP 2001-311395 A JP 2003-74297 A JP 2003-239893 A

  The present invention has been proposed in view of the above-mentioned problems, and it is possible to easily and surely attach a fireproof plate having excellent fireproof performance without making a bolt hole or the like in the steel segment. The purpose is to provide a structure.

  In order to achieve the above object, the fireproof plate mounting structure according to the present invention has the following configuration. That is, an adjustment fitting is attached to a reinforcing rib of a steel segment laid in the tunnel so as to sandwich the rib, and the fireproof plate is attached to and supported by a fireproof plate support fitting attached to the adjustment fitting via a locking fitting. It is characterized by doing so.

  Attach the metal fitting to the reinforcing rib of the steel segment laid in the tunnel as described above so that the rib is sandwiched, and attach the fireproof plate to the fireproof plate support fitting attached to the adjustment metal fitting via the fitting. By making it support, a fire-resistant board can be attached and supported simply and reliably, without forming a bolt hole etc. in a steel segment. As a result, it is possible to easily and quickly achieve a fireproof structure without using a troublesome construction method such as causing a decrease in strength of the segment or spraying a fireproof material onto the segment.

  Hereinafter, the present invention will be specifically described based on the embodiments shown in the drawings. FIG. 1 is a cross-sectional view of a tunnel showing an embodiment of a structure for attaching a refractory plate to a steel segment according to the present invention, FIG. 2 is an enlarged view of a part thereof, and FIG. 3 is an exploded perspective view of metal fittings for attaching the refractory plate. FIG.

  In this embodiment, the adjustment fitting 2 is attached so as to be sandwiched between the reinforcing ribs 13 of the steel segment 1, and the fireproof plate 5 is attached to the fireproof plate support fitting 3 attached to the adjustment fitting 2 via the locking fitting 4 or the like. This is a supported configuration.

  As shown in FIGS. 1 and 4, the steel segment 1 is formed in a substantially arc shape as a whole by combining steel (steel) plate materials and fixing them by welding or the like. 1 are arranged side by side 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. In FIG. 1, L is the outer shell line of the shield, and C is inverted concrete.

  As shown in FIG. 4, each steel segment 1 has a girder 11 extending in the tunnel circumferential direction, a joint plate 12 serving as a connection surface between segments adjacent in the circumferential direction, and a shield machine taking a propulsive reaction force. It consists of reinforcing ribs (vertical ribs) 13 and the like for resisting the pressing force in the tunnel axis direction. In the case of the figure, the reinforcing ribs 13 have a configuration in which strip-shaped plate materials are arranged in the tunnel axis direction, that is, in the lateral direction, and a large number of reinforcing ribs 13 are provided at predetermined intervals in the tunnel circumferential direction. In the figure, reference numeral 14 denotes a reinforcing plate provided radially outside the reinforcing ribs 13.

  The adjustment fitting 2 is attached to the reinforcing rib 13, and in the present embodiment, the adjustment fitting 2 has a substantially C-shaped cross section formed by bending a plate material as shown in FIGS. A metal fitting (hereinafter referred to as a C-shaped metal fitting) 21 and a metal fitting (hereinafter referred to as an L-shaped metal fitting) 22 having a substantially L-shaped cross section are included.

  At the lower part of the C-shaped bracket 21, as shown in FIGS. 5 and 6, folding pieces 21 a having different folding positions at the center and both ends in the width direction (left and right directions in FIGS. 5 and 6B), 21b is provided, and one edge portion of the reinforcing rib 13 is engaged and held between the folded pieces 21a and 21b. On the other hand, the L-shaped bracket 22 is attached to the upper portion of the C-shaped bracket 21 with bolts 61 and nuts 62, and between the vertical piece 22a of the L-shaped bracket 22 and the upper folded piece 21c of the C-shaped bracket 21. The other edge of the reinforcing rib 13 is engaged and held. If the nut 62 is secured in advance to the inner surface of the C-shaped bracket 22 by welding or the like, the attaching operation becomes easy and the loss of the nut can be prevented. Further, instead of the nut 62, a female screw hole for screwing the bolt 61 into the C-shaped bracket 22 may be formed.

  The refractory plate support fitting 3 is attached to the adjustment fitting 2 attached to the reinforcing rib 13 with the mounting bolt 63 and the nut 64 as described above, and the refractory plate 4 is attached to the refractory plate support fitting 3. Similarly to the nut 62, the nut 64 may be fixed to the inner surface of the C-shaped bracket 22 by welding or the like, or a female screw hole for screwing the bolt 63 into the C-shaped bracket 22 may be formed instead of the nut 64.

  In the present embodiment, the refractory plate support metal fitting 3 includes, as shown in FIG. 7, an attachment base portion 3a having attachment holes 30 for the adjustment fitting 2, and upper and lower side edges of the base portion 3a integrally therewith and in a perpendicular direction. The opposing pieces 3b and 3c provided to be bent are formed in a substantially U-shaped cross section, and at the end opposite to the base 3a of the opposing pieces 3b and 3c, respectively, an insertion piece 3d that protrudes upward, It is the structure which provided the insertion piece 3e which protrudes below. The upper insertion piece 3d is provided over the entire length in the longitudinal direction of the upper opposing piece 3b in the present embodiment, and the lower insertion piece 3e has a predetermined interval on both longitudinal sides of the lower opposing piece 3c. A presser piece 3f is provided between the plug-in pieces 3e and 3e. The presser piece 3f and both insertion pieces 3e, 3e are provided by being shifted in the thickness direction thereof, and a fixing metal fitting 4 described later is sandwiched and fixed between the pieces 3f, 3e, 3e. It is.

  The above-mentioned refractory plate support metal fitting 3 is screwed into the nut 64 fixed to the inner surface of the C-shaped metal fitting 22 of the adjusting metal fitting 2 by welding or the like through the attachment hole 30 provided in the base portion 3a. The mounting hole 30 is formed in a long hole shape that is long in the vertical direction. On the other hand, in the vicinity of the upper and lower edges on the back side (segment side) of the refractory plate 5, a locking metal fitting 4 for engaging the insertion pieces 3d and 3e is provided.

  In the present embodiment, each of the locking metal fittings 4 is formed in a substantially strip-like shape in which both end portions in the longitudinal direction are bent stepwise in the thickness direction as shown in FIGS. As shown in FIG. 3, a fixing bolt 65 is inserted into the provided mounting hole (not shown), and the bolt 65 is screwed into an insert nut 66 embedded in the fireproof plate 5 in advance, and is attached to the fireproof plate 5. is there.

  As shown in FIG. 7, a slit-shaped gap S is formed between the middle portion in the longitudinal direction of each locking fitting 4 and the fireproof plate 5, and the fireproof plate support fitting 3 is inserted into the gap S. By inserting the pieces 3d and 3e, the locking metal fitting 4 is engaged and held with the fireproof plate supporting metal fitting 3 as shown in FIG. The lower insertion pieces 3e and 3e are configured to sandwich the locking metal fitting 4 from both sides in the thickness direction with the presser piece 3f provided therebetween.

  Further, as shown in FIGS. 1, 2 and 7, the refractory plate support fitting 3 has a substantially U-shaped recess 31 formed by the mounting base 3a and the opposing pieces 3b and 3c in the vertical direction ( It is constructed so as to be arranged at the joint position (joint position or butting position) of the refractory plates 5 and 5 adjacent to the circumferential direction of the tunnel). By doing so, it is possible to prevent a flame from entering through the gap between the fireproof plates 5 and 5 when a fire occurs.

  As the above-mentioned flame entrainment prevention material, materials and the like are appropriate as long as they have good fire resistance. For example, rock wool, ceramic blanket or a laminate of both, and the surface for preventing sagging due to water leakage thereof. Or the like coated with a mesh or the like can be used. In addition, as a method of fixing the flame entrainment preventing material to the fireproof plate 5 or the fireproof plate support fitting 3 or both, bonding or other appropriate methods may be used, but if a resilient material is used, it is inserted into the recess 31 in a slightly compressed state. It is also possible to make the refractory plate 5 tightly fixed. Further, a flame entrainment preventing material similar to the above may be provided on the segment side between the fireproof plates 5 and 5 adjacent in the tunnel axis direction.

  In constructing the refractory plate mounting structure to the steel segment configured as described above, for example, construction may be performed as shown in FIG. That is, first, the adjustment fitting 2 is attached to the reinforcing rib 13 of the steel segment 1. In the adjustment fitting 2 of the above embodiment, the lower folded pieces 21a and 21b of the C-shaped fitting 21 as shown in FIG. One edge (lower edge in the figure) of the reinforcing rib 13 is engaged between the upper folded piece 21c of the C-shaped bracket 21 and the other edge (upper edge in the figure) of the reinforcing rib 13. Abut.

  In this state, as shown in FIG. 8 (b), the L-shaped bracket 22 is covered, and the other side of the reinforcing rib 13 is placed between the vertical piece 22 a of the L-shaped bracket 22 and the upper folded piece 21 c of the C-shaped bracket 21. The L-shaped bracket 22 is screwed into the C-shaped bracket 21 by screwing a bolt 61 into a nut 62 that is secured to the upper portion of the C-shaped bracket 21 in advance by welding or the like. Install.

  Next, as shown in FIG. 8C, the refractory plate support metal fitting 3 is attached to the adjustment metal fitting 2 composed of the C-shaped metal fitting 21 and the L-shaped metal fitting 22, and in the above-described embodiment, it is attached to the outer surface of the C-shaped metal fitting 21. With the refractory plate support fitting 3 attached, a bolt 63 is inserted into the long hole 31 (see FIGS. 3 and 7) formed in the refractory plate support fitting 3 and the inner surface of the central portion of the C-shaped fitting 21 is previously provided. The bolt 63 is lightly screwed into a nut 64 fixed by welding or the like and temporarily assembled, and the refractory plate support fitting 3 is moved up and down along the long hole 31 in that state to adjust the height position. After that, if the bolt 63 is tightened, it can be fixed at a desired position.

  Next, the refractory plate 5 is attached to the refractory plate support fitting 3 attached to the steel segment 1 via the adjustment fitting 2 as described above, as shown in FIGS. The attachment work may be performed by, for example, installing the refractory plates 5 in order from the bottom to the top on the inner surface of the segment above the inverted concrete 2 in FIG.

  At that time, each fire-resistant plate 5 engages the lower locking metal fitting 4 with the previously attached lower fire-resistant plate supporting metal fitting 3 and then engages the upper locking metal fitting 4 with the upper fire-resistant plate supporting metal fitting 3. In this case, the upper refractory plate support fitting 3 is preliminarily assembled to the adjustment fitting 2 as described above, and the upper refractory plate support fitting 3 has a downward insertion piece 3e. After inserting the upper locking metal fitting 4 between 3e and the presser piece 3f, the bolt 63 is tightened. Alternatively, before the refractory plate support fitting 3 is attached to the adjustment fitting 2, the upper engagement fitting 4 is engaged between the downward insertion pieces 3e and 3e and the presser piece 3f of the refractory plate support fitting 3. The refractory plate support fitting 3 may be attached to the adjustment fitting 2.

  After the refractory plate 5 is laid in order from the bottom on the inner surface of the steel segment 1 as described above and the refractory plate 5 is laid over the entire length in the circumferential direction of the tunnel above the invert concrete 2, the axis of the tunnel In the present invention, the adjustment metal fitting 2 is attached so as to be sandwiched between the reinforcing ribs 13 of the steel segment 1, and the fireproof plate supporting metal fitting attached to the adjustment metal fitting 2 is attached. Since the refractory plate 5 is attached to and supported by the bracket 3 via the locking metal fitting 4, the refractory plate 5 can be laid on the inner surface of the steel segment 1 simply, reliably, easily and quickly.

  Further, the fireproof plate 5 is configured to be laid on the inner surface of the segment through the adjustment metal fitting 2, the fireproof plate support metal fitting 3, the locking metal fitting 4, and the like, so that the segment 1, the fireproof plate 5, and the fireproof plates are the fireproof plate support metal fittings. 3 and the engagement fitting 4 are indirectly engaged and held, and the insertion pieces 3d and 3e of the refractory plate support fitting 3 are inserted in the slit-shaped gap S between the engagement fitting 4 and the refractory plate 5. Since it is also possible to slide, even when the segment 1 moves due to an earthquake or the like, the individual refractory plates individually follow the movement and are not peeled off or damaged. Therefore, it is also excellent in earthquake resistance.

  In addition, although the said embodiment used the C-shaped metal fitting 21 and the L-shaped metal fitting 22 as the adjustment metal fitting 2, it is not restricted to this but can change suitably. FIG. 9 shows a modified example of the adjustment fitting 2. The adjustment fitting 2 of this example comprises a pair of substantially J-shaped fittings (hereinafter referred to as J-shaped fittings) 23 and 24 arranged upside down with respect to each other. . Each of the J-shaped brackets 23 and 24 is provided with folded pieces 23a, 23b, 24a and 24b having different folded positions at the center portion and both end portions in the width direction (left and right direction in FIG. 8). -It is the structure which engages and holds the both-sides edge part of the reinforcement rib 13 between 23b, 24a, 24b, respectively.

  The J-shaped brackets 23 and 24 are connected and fixed using the mounting bolts 63 and nuts 64 of the refractory plate support bracket 3, and the bolts 63 penetrate both the J-shaped brackets 23 and 24. Then, it is configured to be screwed into the nut 64 fixed to the J-shaped bracket 23 by welding or the like. Further, by making the bolt insertion hole 24i of the J-shaped bracket 24 into a long hole, the both J-shaped brackets 23 and 24 are in the longitudinal direction of the bolt insertion hole 24h (in the drawing, with the bolt 63 lightly screwed into the nut 64) The folding pieces 23 a, 23 b, 24 a, 24 b can be engaged with both side edges of the reinforcing rib 13.

  FIG. 10 shows another modified example of the adjusting metal fitting 2. In this example, a pair of J-shaped metal fittings 23 and 24 arranged upside down in the same manner as in the modified example of FIG. 9 are used. A pair of upper and lower L-shaped metal fittings 22 that are substantially the same as those in the embodiment of FIGS. 1 to 8 are used. In the example of FIG. 9, each of the J-shaped brackets 23 and 24 is provided with three folded pieces having different folded positions at the center and both ends in the width direction. In this example, the folded positions are extended over the entire length in the width direction. The fixed folding pieces 23c and 24c are provided one by one, and the L-shaped bracket 22 is the same as that in the embodiment of FIGS. 1 to 8 except that the bolt insertion hole 22h of the mounting bolt 61 is elongated. It is the same as the character-shaped metal fitting 22.

  The J-shaped brackets 23 and 24 are connected and fixed using the mounting bolts 63 and nuts 64 of the refractory plate support bracket 3 in the same manner as in the example of FIG. In this configuration, the nut 64 penetrates and is fixed to the J-shaped metal fitting 23 by welding or the like. The pair of L-shaped brackets 22 are attached to the J-shaped brackets 23 and 24 with bolts 61 and nuts 62 in the same manner as in the embodiment of FIGS. 1 to 8, and the vertical piece 22 a of each L-shaped bracket 22. And both side edges of the reinforcing rib 13 are fixed between the folded pieces 23c and 24c.

  The nut 62 is also fixed to the inner surfaces of the J-shaped brackets 23 and 24 by welding or the like. If the mounting hole 22h of the L-shaped bracket 22 is a long hole, the distance between the vertical piece 22a and the folded pieces 23c and 24c can be adjusted within the range of the long hole. It is possible to cope with a difference in thickness of the rib 13 or a change. In the embodiment of FIGS. 1 to 8, the same effect as described above can be obtained by making the mounting hole 22h of the L-shaped bracket 22 into a long hole. Further, if the refractory plate 5 is attached to the steel segment 1 in the same manner as described above by using the adjustment fitting shown in FIGS. 9 and 10 instead of the adjustment fitting 2 in the embodiment shown in FIGS. Is obtained.

  In addition, the steel segment is generally thinner than the concrete segment, so even if a refractory plate is floated on the inner surface of the segment, the tunnel finished mold can be finished in the same manner as the concrete segment. FIG. 11 shows a specific example. FIGS. 11A and 11B show a steel segment 1 and a concrete segment 10 having a substantially equal outer diameter on the inner surface of a tunnel excavated by a shield machine having substantially the same diameter. Are laid, and the refractory plate 5 is floated and stretched inside the steel segment 1 of FIG. The position of the inner surface of the refractory plate 5 is substantially the same as the position of the inner surface of the concrete segment 10 or on the outer side, and the construction thickness can be very thin. It can also be seen that when the fireproof plate 5 is floated on the inner surface of the concrete segment 10, the tunnel space is further narrowed.

  As described above, according to the structure for attaching a refractory plate to a steel segment according to the present invention, the refractory plate can be easily and reliably attached and supported without forming a bolt hole or the like in the steel segment. As a result, it is possible to easily and quickly create a fire-resistant structure without using a troublesome method such as reducing the strength of the segments or spraying refractory materials on the segments. It is effective and suitable as a mounting structure for mounting.

The cross-sectional view of the tunnel which shows one Embodiment of the fireproof board attachment structure by this invention. The one part enlarged view of the said fireproof board attachment structure. The disassembled perspective view of the metal fittings for attaching a fireproof board in the said attachment structure. The perspective view which shows an example of a steel segment. The perspective view which shows an example of an adjustment metal fitting. (A) is a side view of the state where the adjustment fitting is attached to the reinforcing rib, (b) is an inner surface view thereof, (c) is a plan view, and (d) is a bottom view. The perspective view which shows the assembly | attachment point of the fireproof board with respect to a fireproof board support metal fitting. (A)-(e) is explanatory drawing which shows the construction point of the said fireproof board attachment structure. The perspective view which shows the other example of adjustment metal fittings. The perspective view which shows the further another example of an adjustment metal fitting. (A) And (b) is explanatory drawing which shows the comparison with a concrete segment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Steel segment 11 Girder material 12 Joint plate 13 Reinforcement rib 14 Reinforcement plate 2 Adjustment metal fitting 21 C-shaped metal fitting 21a, 21b, 21c Folding piece 22 L-shaped metal fitting 3 Fireproof plate support metal fitting 4 Locking metal fitting 5 Fireproof plate 61, 63, 65 Bolt 62, 64, 66 Nut T Tunnel L Shield outer shell line C Invert concrete

Claims (1)

  Attach the adjustment bracket to the reinforcing rib of the steel segment laid in the tunnel so that the rib is sandwiched, and attach the fireproof plate to the fireproof plate support bracket attached to the adjustment bracket via the locking bracket and support it. Refractory plate mounting structure to the steel segment.

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