JP2006161333A - Fireproof segment and fireproof tunnel structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To facilitate the construction of a fireproof cylindrical wall body, and to facilitate repair after fire extinguishment. <P>SOLUTION: The cylindrical wall body 1 is constructed by circumferentially and axially connecting arc-shaped plate-like fireproof segments 2 together along an inner surface of an excavated hole. The fireproof segment 2 is constituted by infilling fireproof concrete 4, into which fibers are mixed, into a steel shell body 3 in which steel materials are connected together in a frame shape. A protrusion 4a with an approximately trapezoidal cross section, which is protruded inward in an area enclosed with the steel shell body 3, is formed on the inner surface of the fireproof segment 2. A fireproof panel 26 is stuck on the inner surface-side recess 1a of a joint part between the fireproof segments 2 and 2. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a fire-resistant segment and a fire-resistant tunnel structure that constitute a cylindrical wall body having fire resistance.

When the temperature inside the tunnel becomes high due to a fire in the tunnel, the moisture in the concrete may expand and crack in the segments constituting the cylindrical wall body, causing peeling.
For this reason, in order to prevent deterioration and damage of the cylindrical wall body due to fire in the tunnel, for example, a fire-resistant panel formed of a fire-resistant and flame-retardant material such as ceramics is pasted on the entire inner surface of the cylindrical wall body. (For example, refer to Patent Documents 1 and 2).
For example, the fireproof panel is formed by inserting an anchor bolt embedded in a segment constituting the cylindrical wall body into a hole formed in the fireproof panel, screwing a nut into the anchor bolt, and fastening and fixing it to the inner surface of the cylindrical wall body. Fixed. In some cases, a bracket is fixed to an anchor bolt of a segment, and a fireproof panel is fastened and fixed to the bracket by a bolt and a nut.
JP 2003-129797 A JP 2001-311395 A

By the way, in order to attach a fireproof panel to the whole inner surface of a cylindrical wall body with the above attachment structure, there was a problem that a great deal of labor and labor were required, and therefore the construction period was unavoidable.
Also, this fireproof panel can only be manufactured smaller than the segments that make up the cylindrical wall body, and therefore, a large amount of fireproof panel is required to cover the entire inner surface of the cylindrical wall body, which also increases costs. It was inevitable.
In addition, the joints of the refractory panels must be covered with a siding plate made of a refractory material so that no flame is blown from the joints between the refractory panels, which requires a lot of labor for the construction.
Furthermore, when repairing after extinguishing the fire, it is necessary to remove all the fireproof panels that have deteriorated due to the flame from the inner surface of the cylindrical wall body and replace them with new ones. It was.
In addition, there is a construction method in which a fireproof material is sprayed on the inner surface of the cylindrical wall body, and the entire inner surface of the cylindrical wall body is covered with this fireproof material, but the construction period is long, and the thickness control of the spraying is extremely difficult. In other words, finishing work on the inner surface must be performed, which requires a lot of labor, labor, and time.

  This invention is made in view of the said situation, and it aims at providing the fireproof segment and fireproof tunnel structure which can construct | assemble the cylindrical wall body which has fire resistance very easily and at low cost. .

  In order to achieve the above object, the refractory segment of the present invention is an arc plate-like segment constituting a cylindrical wall body by being connected in a circumferential direction and an axial direction along the inner surface of the excavation hole, It consists of a steel shell body in which steel materials are joined in a frame shape, and concrete filled inside the steel shell body, and the concrete is a refractory concrete in which at least a portion exposed to the inner peripheral surface side is mixed with fibers. It is characterized by being.

According to the present invention, at least a portion of the concrete exposed from the steel shell to the inner peripheral surface side is a refractory concrete having a significantly improved tensile strength by mixing fibers, so that deterioration and damage due to a flame are prevented. It is suppressed and the occurrence of cracks is reliably prevented. Moreover, even if it deteriorates to some extent by a flame, it can be easily repaired by coating the surface with a new refractory concrete.
In addition, although the concrete of the part exposed to the inner peripheral surface side from a steel shell body should just be a refractory concrete, the whole concrete with which it fills in a steel shell body is good also as a refractory concrete.

Further, by increasing the thickness of the concrete, a protruding portion that protrudes toward the inner peripheral surface side is formed, and a concave portion into which a fireproof panel can be fitted is formed between the protruding portions when they are joined to each other. Is preferred.
Thereby, since the fireproof panel is fitted into the concave portion between the projecting portions at the joint portion of the fireproof segment, the mounting work is facilitated and the number of fireproof panels used is reduced, thereby reducing the cost. Moreover, the inner surface of the cylindrical wall can be smoothed by setting the protrusion and the fireproof panel to the same thickness.

  The fire-resistant tunnel structure of the present invention is a tunnel structure constructed by connecting arc-plate-like segments in the circumferential direction and the axial direction along the inner surface of the excavation hole, and the segments are made of a steel frame. It consists of a refractory segment made of refractory concrete in which the inside of the steel shell body bonded to is filled with concrete and at least the portion exposed on the inner peripheral surface side is mixed with fibers, and on the inner surface side of the joint portion between the refractory segments The fireproof panel is affixed.

According to the present invention, at least a portion of concrete exposed from the steel shell body to the inner peripheral surface side is made of refractory segments, which are made of refractory concrete whose tensile strength is greatly improved by mixing fibers, thereby forming a cylindrical wall body. And since the inner peripheral surface in the joint part of these refractory segments is covered with the refractory panel, deterioration and damage due to the flame can be suppressed, and the occurrence of cracks and the like can be prevented. In addition, deterioration and damage due to the flame at the joint portion between the refractory segments are reliably prevented by the refractory panel.
In addition, after the fire is extinguished, it is possible to easily repair by replacing the fireproof panel provided only at the joint of the fireproof segment and applying a new fireproof concrete to the inner surface of the slightly deteriorated fireproof segment. It is.
As the refractory segment, it is sufficient that at least the portion of the concrete exposed from the steel shell to the inner peripheral surface is refractory concrete, but the entire concrete filled in the steel shell is made of refractory concrete. Also good.

Further, by increasing the thickness of the concrete, a protrusion projecting toward the inner peripheral surface side is formed on the fireproof segment, and the fireproof panel is fitted between the protrusions of the fireproof panel joined together. Are preferably attached.
Thereby, the attachment of the fireproof panel between the fireproof segments on the inner peripheral surface of the cylindrical wall body is facilitated, and the construction work can be further facilitated. Moreover, the inner surface can be smoothed by setting the protrusion and the fireproof panel to the same thickness.

According to the fire-resistant segment and fire-resistant tunnel structure of the present invention, even if a fire occurs in the tunnel, the concrete constituting the segment is pulled by mixing fibers into at least a portion exposed to the inner peripheral surface side. Since refractory concrete with significantly improved strength is used, deterioration and damage due to flame can be suppressed, and the occurrence of cracks and flaking can be prevented. Further, since the joint portion between the segments is covered with the fireproof panel, deterioration and damage due to the flame of the joint portion can be surely prevented.
In other words, by using this refractory segment, it is not necessary to attach a refractory panel to the entire tunnel inner surface, so it is possible to greatly reduce the labor, labor and cost required for construction work, and greatly shorten the construction period. it can.
In addition, after extinguishing the fire, the fire-resistant panel provided only at the joint of the fire-resistant segment can be replaced, and the repair can be completed very easily by coating the inner surface of the slightly deteriorated fire-resistant segment and applying new fire-resistant concrete. Can do.

Hereinafter, embodiments of the fireproof segment and fireproof tunnel structure of the present invention will be described with reference to the drawings.
1 is a partial cross-sectional view of a cylindrical wall body showing a fire-resistant tunnel structure according to the embodiment, FIG. 2 is a perspective view of the fire-resistant segment according to the embodiment, and FIG. 3 is a cross-sectional view of the fire-resistant segment shown in FIG. FIG. 4 is a perspective view of a steel shell constituting the refractory segment.
As shown in FIG. 1, the cylindrical wall body 1 is configured by joining a plurality of refractory segments 2.
As shown in FIGS. 2 to 4, the refractory segment 2 has an arc plate shape, and a steel shell 3 in which a steel material is curved in an arc shape and joined in a frame shape with a predetermined thickness, and the steel shell body 3. It is comprised from the refractory concrete 4 with which the inside of the space part was filled.

The steel shell 3 has an outer peripheral side structural member 5 that covers the corners of the four sides of the outer peripheral surface on the natural mountain side and an inner peripheral side structural member 6 that covers the corners of the four sides of the inner peripheral surface on the inner air side. The outer peripheral side structural member 5 and the inner peripheral side structural member 6 have a frame whose long side direction has a substantially L-shaped cross section.
The outer peripheral side structural member 5 has a linear plate portion 5a extending along the outer peripheral surface and a plate portion extending along the thickness direction of the refractory segment 2 in the short direction (axial direction of the excavation hole). 5c, and also in the longitudinal direction (circumferential direction of the excavation hole), it has a plate portion 5b extending along the outer peripheral surface and a plate portion 5d extending along the thickness direction of the refractory segment 2. ing.

  Similarly, the inner circumferential side structural member 6 also extends along the thickness direction of the refractory segment 2 and the linear plate portion 6a extending along the inner circumferential surface in the short direction (axial direction of the excavation hole). Plate portion 6c extending in the longitudinal direction (the circumferential direction of the excavation hole) and extending along the thickness direction of the refractory segment 2 with respect to the plate portion 6b extending along the inner peripheral surface. And a plate portion 6d.

The outer peripheral side structural member 5 and the inner peripheral side structural member 6 are connected by a connecting member 7 arranged in a lattice shape, and on the outer peripheral surface side, a skin plate 8 is connected to the outer peripheral side structural member 5 by watertight welding. It is fixed by welding.
Further, seal grooves 9 are formed in the plate portions 5c and 5d of the outer peripheral side structural member 5 and the plate portions 6c and 6d of the inner peripheral side structural member 6, and the fireproof segments 2 are arranged in the seal groove 9 together. Sealing materials 10 that are in close contact with each other when bonded are disposed.

  Further, the refractory segment 2 has an inter-segment joint 21 for connecting the excavation holes in the circumferential direction, and the inter-segment joint 21 includes a relay fitting 21a and an insert fitting 21b. The inter-segment joint 21 is configured such that the fire-resistant segments 2 are connected to the recess 23 formed in the insert metal fitting 21b in the state where the relay metal fitting 21a of the fire-resistant segment 2 joined in the circumferential direction of the excavation hole is arranged. By sliding in the direction, the relay fitting 21a enters the fitting 24 of the insert fitting 21b and engages with each other.

  The refractory segment 2 has an inter-ring joint 22 for connecting in the axial direction of the excavation hole, and the inter-ring joint 22 includes a male fitting 22a and a female fitting 22b. In the inter-ring joint 22, the engagement rod 25 of the male fitting 22a is inserted into an engagement hole (not shown) of the female fitting 22b of the fireproof segment 2 joined in the axial direction of the excavation hole. The engagement rod 25 of 22a is held and engaged with each other.

The refractory concrete 4 filled in the space portion of the steel shell 3 having the above-described structure is made of fiber-containing concrete mixed with fibers such as polypropylene fiber or steel fiber, for example. Compared with the above, the tensile strength is improved, and thus damage such as cracks is suppressed even if thermal expansion occurs.
In addition, the thickness of the refractory segment 2 in the portion surrounded by the inner peripheral structural member 6 of the steel shell 3 is increased by causing the refractory concrete 4 to protrude toward the inner peripheral side.

Thus, when the refractory concrete 4 is protruded to the inner peripheral side to form the protruding portion 4a having a substantially trapezoidal cross section, the refractory segments 2 and 2 are joined together to form the cylindrical wall body 1, A recess 1a is formed between adjacent protrusions 4a, 4a.
And the fireproof panel 26 of the substantially same thickness dimension as the protrusion dimension of the protrusion part 4a is engage | inserted by the recessed part 1a of this cylindrical wall body 1. FIG. Then, by fitting the fireproof panel 26 into the recess 1a, the fireproof panel 26 allows the inner peripheral side structural members 6 and 6 of the steel shell 3 of each fireproof segment 2 and the joint portion between the fireproof segments 2 and 2 to be joined together. Covered. In addition, as shown in FIG. 1, the cylindrical wall 1 has the inner surface smoothed by alternately arranging the protrusions 4 a of the fireproof segments 2 and the fireproof panels 26 in four directions.

When manufacturing the said refractory segment 2, first, while arrange | positioning the steel shell 3 in the mold form which is not shown in figure, the joint 21 between segments and the joint 22 between rings are installed in the predetermined position of a mold, Then, a mold The inside is filled with fiber-containing concrete to be refractory concrete 4.
When the concrete is hardened, the arc plate-like refractory segment 2 in which the steel shell 3 and the refractory concrete 4 are integrated is taken out of the mold and cured for a predetermined period.

Next, the case where a fireproof tunnel is constructed using the fireproof segment 2 and the fireproof panel 26 will be described.
In order to construct a fire-resistant tunnel, a tubular wall 1 is constructed by forming a drilling hole with a shield machine and joining the fire-resistant segments 2 along the inner surface of the drilling hole on the rear side of the shield machine.
In order to join the fireproof segments 2 to each other, the circumferential joint surface of the fireproof segment 2 to be joined is brought into contact with the circumferential joint surface of the fireproof segment 2 of the cylindrical wall body 1 that has already been constructed. The segment 2 is pushed into the cylindrical wall 1 side with a jack.

By doing so, the relay fitting 21a and the insert fitting 21b constituting the inter-segment joint 21 of the circumferential joint surfaces in contact with each other are engaged with each other, and the female joint of the refractory segment 2 on the cylindrical wall 1 side is engaged. The male joint 22a of the refractory segment 2 to be joined is fitted into 22b.
Thereby, the fireproof segment 2 is joined to the existing cylindrical wall body 1 in order, and the cylindrical wall body 1 is gradually constructed with excavation of the excavation hole by the shield machine.

Next, on the inner surface of the constructed cylindrical wall body 1, the fireproof panel 26 is fitted into the recess 1 a formed between the fireproof segments 2 and fastened to the fireproof segment 2 with a fastener such as a bolt or a nut. .
By the above operation, the fireproof panel 26 is attached between the fireproof segments 2 of the cylindrical wall body 1 made of the fireproof segment 2, and the protrusions 4a made of the fireproof concrete 4 of the fireproof segment 2 and the fireproof panel 26 are exposed on the inner peripheral surface. A fire-resistant tunnel with a smooth inner surface is constructed.
The fireproof panel 26 may be bonded and fixed to the fireproof segment 2 with an adhesive, for example. Further, when a gap is generated between the refractory segment 2 and the refractory panel 26, it is preferable to fill the gap with refractory coking.

And, according to the fire-resistant tunnel structure using the fire-resistant segment 2, even if a fire occurs in the tunnel, the fire-resistant fire resistance whose tensile strength is greatly improved by mixing fibers as the concrete constituting the fire-resistant segment 2 Since the concrete 4 is used, even if moisture in the concrete thermally expands due to the flame, fine cracks can be generated, but the enhanced tensile property can surely prevent the occurrence of large cracks and peeling of the concrete. Further, since the joint portion is covered with the fireproof panel 26, deterioration and damage due to the flame of the joint portion can be reliably prevented.
In other words, by using this fireproof segment 2, it is not necessary to attach the fireproof panel 26 to the entire tunnel inner surface, so that the labor, labor and cost for construction work can be greatly reduced, and the construction period is greatly shortened. be able to.

In addition, the refractory segment 2 is formed with a protruding portion 4a protruding toward the inner peripheral surface side by increasing the thickness of the refractory concrete 4, and the refractory panel 26 is formed between the protruding portions 4a when joined together. Since the recessed portion 1a that can be fitted is formed, the fireproof panel 26 can be attached to a predetermined position covering the seam very easily, and the construction work can be further facilitated.
In addition, the inner surface of the cylindrical wall 1 can be smoothed by setting the protrusion 4a and the fireproof panel 26 to the same thickness.

  In addition, after the fire is extinguished, the fireproof panel 26 provided only at the joint portion between the fireproof segments 2 is replaced, and the surface of the projecting portion 4a of the fireproof segment 2 slightly deteriorated is applied to newly apply the fireproof concrete 4. The repair can be completed very easily.

  In the above embodiment, the entire concrete of the refractory segment 2 is formed of the refractory concrete 4, but at least the surface portion exposed to the inner surface side such as the protruding portion 4a may be refractory concrete and the other portion may be normal concrete. .

5 and 6 show a modified example. As shown in the figure, the cylindrical wall body 31 uses an arc-shaped plate-like refractory segment 32 having a uniform thickness in which the protruding portion 4a is not formed on the inner surface side. This refractory segment 32 is also manufactured by filling the inner surface of the steel shell 3 with fiber-mixed concrete as in the embodiment.
And the tunnel structure which consists of the cylindrical wall body 31 incorporating this fireproof segment 32 is equipped with the structure which attaches the fireproof panel 26 with a volt | bolt, an adhesive agent, etc. to the joint of each fireproof segment 32, 32, Therefore The inner peripheral surface of the wall-shaped body 31 has a structure in which the fireproof panel 26 provided at the joint between the fireproof segments 32 and 32 protrudes inward by the thickness thereof, so that the inner surface is not smooth, but as in the above embodiment. Thus, good fire resistance can be ensured at low cost without requiring much labor and labor. In addition, the manufacture of the refractory segment 32 is further facilitated compared to the above embodiment.

FIG. 7 shows a second modification and is a cross-sectional view of the segment 2. This segment 2 is a refractory concrete 4 only in the protruding portion 4a, that is, the inner peripheral surface portion exposed from the inner peripheral side structural member 6 of the steel shell 3 located on the inner space side of the tunnel with the tubular wall covered. It is formed in layers, and the inner surface of the other steel shell 4 is filled with normal concrete 4b that does not mix fibers. Thereby, the cheaper segment 2 can be manufactured.
Moreover, in the segment 32 shown in FIG. 6 which does not have the protrusion part 4a, the concrete layer part exposed to the inner peripheral surface side is formed of the fiber-mixed concrete 4a as in FIG. 7, and the other part is the concrete 4b containing no fibers. (It is illustrated by a one-dot chain line in FIG. 6).

FIG. 8 is a main part view showing a modified example of the joint portion.
In the refractory segment 2 or 32 shown in FIG. 8, a cylindrical portion 41 in which a plurality of ring washers 40 having spring properties are arranged on the female joint 22b forming one of the inter-ring joints 22 abutted against each other is an anchor bar. It is fixed to the concrete 4 with. The male joint 22a that forms the other of the inter-ring joints 22 has a cylindrical pin 42 provided at the tip of the anchor, and a plurality of saw-like convex portions 43 are arranged on the outer peripheral surface of the pin 42 in the circumferential direction. .
And the convex part 43 is elastically latched by the ring-shaped washer 40 by inserting the pin 42 in the cylindrical part 41 of the female joint 22b, and is connected.

It is sectional drawing of the cylindrical wall body which shows the fireproof tunnel structure which concerns on embodiment. It is a perspective view of the fireproof segment concerning an embodiment. It is the sectional view on the AA line of the fireproof segment shown in FIG. It is a perspective view of the steel shell which comprises a fireproof segment. It is sectional drawing of the cylindrical wall body which shows the modification of a fireproof tunnel structure. It is sectional drawing of the fireproof segment by the 1st modification which comprises the cylindrical wall body shown in FIG. It is a figure similar to FIG. 3 which shows the 2nd modification of a fireproof segment. It is a figure which isolate | separates and shows the modification of the joint between rings of a fireproof segment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 31 Cylindrical wall 1a Recessed part 2, 32 Refractory segment 3 Steel shell body 4 Refractory concrete 4a Protrusion part 26 Refractory panel

Claims (4)

A circular arc plate-like segment constituting a cylindrical wall body by being connected in a circumferential direction and a plurality of axial directions along the inner surface of the excavation hole,
It consists of a steel shell body in which steel materials are combined in a frame shape, and concrete filled in the steel shell body,
The refractory segment, wherein the concrete is a refractory concrete mixed with fibers at least at a portion exposed to the inner peripheral surface side.   By increasing the thickness of the concrete, a protruding portion that protrudes toward the inner peripheral surface side is formed, and a concave portion into which a fireproof panel can be fitted is formed between the protruding portions when they are joined to each other. The refractory segment according to claim 1. A tunnel structure constructed by connecting arc plate segments in the circumferential direction and the axial direction along the inner surface of a drilling hole,
The segment is composed of a refractory segment in which a steel shell body in which steel materials are joined in a frame shape is filled with concrete, and at least a portion exposed on the inner peripheral surface side is a refractory concrete mixed with fibers,
A fire-resistant tunnel structure, wherein a fire-resistant panel is attached to an inner surface side of a joint portion between the fire-resistant segments. By increasing the thickness of the concrete, a protrusion projecting toward the inner peripheral surface is formed on the fireproof segment, and the fireproof panel is fitted and attached between the protrusions of the fireproof segment joined together. The refractory tunnel structure according to claim 3, wherein

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