JP2003138891A - Fire-resistive covering structure in tunnel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fire-resistive panel for covering the inside of a tunnel and a fire-resistive covering structure in the tunnel for protecting the concrete inwall of the existing or new tunnel for a road from the heat of a fire. SOLUTION: In the fire-resistive covering structure in the tunnel used for the inside of a primary lining body composed of reinforced concrete, iron or the composite body of iron and concrete carried out on either tunnel of a shield tunnel, an immersed tunnel or an excavated tunnel, the fire-resistive covering structure is composed of the fire-resistive panels 6, in which cavity-side surfaces in the tunnel are covered with metal plates 10 and which consist of a heat- insulating material 8, and supporters 11 being extended in the tunnel peripheral direction and bonding the mutual adjacent fire-resistive panels 6 in the tunnel axial direction while fixing the fire-resistive panels 6 onto the primary lining body 3 through fixing bolts 12, and the metal plates 10 have a corrugated shape 13 in the tunnel axial direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention mainly relates to an existing or newly constructed road tunnel and has been proposed to protect the inner wall surface of a shield tunnel, a buried tunnel or an excavated tunnel from the heat of a fire. It relates to a coating structure.

[0002]

2. Description of the Related Art A shield tunnel is constructed by excavating the ground by a shield machine and reinforcing the inner surface of the ground with a primary lining body such as a concrete segment or a steel-concrete composite segment. In this case, the excavated tunnel is constructed by excavating the ground from the ground after constructing the earth retaining wall, and then constructing a tunnel body mainly made of reinforced concrete and backfilling.

Further, the submerged tunnel is constructed by being sunk on the seabed or the like. In the case of this submerged tunnel that is installed on the seabed, a reinforced concrete block with a huge box cross section manufactured at the factory is transported to the installation site on the sea by a work boat and then sunk into the seabed, and the multiple reinforced concrete blocks are connected to each other on the seabed. Then, it is constructed as a subsea road tunnel.

By the way, due to an increase in the number of tunnels due to the development of the road network and an increase in the traffic volume due to the increase in the number of vehicles, the frequency of fire accidents due to collisions between vehicles in the road tunnel, falls, etc. The number of fire accidents is increasing and the scale of fire accidents is also increasing. In particular, the risk of a disaster when a fire accident in a tunnel occurs due to a tank truck equipped with a flammable liquid fuel or a liquefied chemical is much higher than expected.

In a fire accident in a tunnel, it is needless to say that human injury must be minimized, but another problem is how to protect the tunnel inner wall, especially the lining concrete from heat. is there.

That is, in most existing road tunnels, lining concrete is exposed on the inner wall surface of the tunnel. In such tunnels,
When a fire occurs, the rapidly rising high-temperature heat is directly transferred to the lining concrete by thermal shock, and the moisture contained in the concrete evaporates rapidly. It could lead to a major accident such as a collapse. Even if the concrete is not exposed to the radiation, there is a risk that the concrete may be deteriorated and cracked and the fire may be extinguished, causing the concrete to collapse or come off. In this case, after the fire accident, the lining concrete will be repaired for a considerable period of time, but during that time, traveling inside the tunnel is prohibited,
Alternatively, one-way traffic may be used, and in any case, economic and social losses are not small.

From the above, at present, the work of formulating the road tunnel fire resistance standard is energetically advanced. Conventionally, a fireproof panel for tunnel inner coating, which is a fireproof panel used inside a primary lining body made of reinforced concrete, iron or a composite of iron and concrete, which has been constructed in a shield tunnel, is
Implemented by Promat. The structure is a structure in which the heat insulating material is covered inside the primary lining body. The heat insulating material is cement calcium silicate refractory board material.

Further, Japanese Patent No. 2958285 discloses a heat insulating refractory material having a limited composition. This publication has a description for the purpose of covering a tunnel, and its constitution is a composition of a heat insulating refractory material of a structure for covering a heat insulating material inside a primary lining body.

[0009]

In the conventional road tunnel, when the lining concrete (primary lining body) is exposed on the inner wall surface of the tunnel and a fire in the tunnel occurs,
The tunnel collapsed due to the erosion of the lining concrete,
The lining concrete deteriorates due to heat, and repair work is required over a long period of time, which increases economic and social loss. On the other hand, the heat insulating material which is a fire resistant panel used inside the primary lining body of the prior art is an inorganic material fire resistant heat insulating material, but there is no problem in the heat insulating function of the material.

However, due to a mismatch (error) between the curvature of the inner surface of the lining concrete and the curvature of the rear surface of the fireproof panel, or the unevenness of the inner surface of the lining concrete, a gap is likely to be formed on the rear surface of the panel. Therefore, the heat insulation performance is impaired. Furthermore, since it is difficult to completely adhere (close) the joints between the fireproof panels, the heat flow easily enters the gaps on the back of the panel from the gaps in the joints. Also, since the fireproof panel of the road tunnel is installed around the ceiling of the tunnel and the tunnel has been used for several decades, it is an important factor that there is no fear of falling during service. When a conventional inorganic material-based fireproof insulation material is used as a fireproof panel, for example, if the fireproof panel fixed by bolts is on the ceiling for a long time, the location of the fixed portion is because the fireproof panel is an inorganic material. I couldn't deny that the crack had grown, so I was worried about falling.

In addition, it has the drawback that it is easily cracked by the impact force acting during transportation and construction, or it is easily cracked when bolted due to the mismatch between the inner surface shape of the lining concrete and the back surface of the fireproof panel. When it tended to reduce safety.

Further, when a conventional inorganic material-based fireproof heat insulating material is used as a fireproof panel inside the primary lining body, there is a lack of a cleaning work function for maintaining the appearance of the tunnel. When cleaning with water spray, stains were likely to adhere to the surface of the fireproof panel because it was a porous body.

Further, it is preferable that the metal plate of the fire-resistant panel is as thin as possible while using a thin steel plate, and further, the fire-resistant panel manufactured to have a predetermined length and width. When adding the tunnel circumferential direction and the tunnel axial direction and fixing it to the primary lining body, it is easy to transfer hot air from the joint opening as described above, so after eliminating this joint opening, each fireproof panel is easy, There has been a demand for new innovations in the lining structure that can be reliably fixed to the primary lining body.

The present invention solves the above-mentioned drawbacks. Even when a fire in a tunnel occurs, the high temperature heat is not directly transmitted to the lining concrete, so that the lining concrete does not rupture and the Since the work concrete does not deteriorate, there is no need to restore it, and there is no opening of joints between the fireproof panels, and the fireproof panel can be securely fixed to the inner surface of the primary covering inside the tunnel. It is intended to provide a structure.

[0015]

In order to achieve the above object, the present invention is constructed as follows.

The invention according to claim 1 is a tunnel used inside a primary lining body made of reinforced concrete, iron or a composite of iron and concrete, which is constructed in any one of a shield tunnel, a submerged tunnel, and an excavated tunnel. A fireproof panel with an inner fireproof coating structure, which is made of a heat insulating material whose inner surface on the tunnel side is covered with a metal plate, and which extends in the tunnel circumferential direction and joins the fireproof panels adjacent to each other in the tunnel axial direction. The metal plate has a corrugated shape in the tunnel axis direction, the support member being for fixing the refractory panel to the primary lining body via a fixing member.

According to a second aspect of the present invention, in the first aspect of the present invention, the supporting member is a flat plate having a predetermined length and a predetermined width, or a predetermined length having a ridge in the central portion along the longitudinal direction,
It is characterized by being made of a flat plate having a predetermined width.

The invention according to claim 3 is the invention according to claim 1 or 2.
In the invention described in (1), the supporting tool has an opening for inserting a fixing tool having a size that is movable with respect to the fixing tool.

According to a fourth aspect of the invention, in the invention according to any one of the first to third aspects, the fixing tool is a bolt, and the female screw embedded in the primary lining body and the supporting tool. Are fixed by the bolts.

According to a fifth aspect of the invention, in the invention according to any one of the first to fourth aspects, there is provided a space holder for defining the thickness of the heat insulating material between the primary lining body and the support. In addition to being interposed, the support is fixed to the primary lining body.

According to a sixth aspect of the invention, in the fifth aspect of the invention, the spacing member is formed of a cylindrical body.
The bolt is fitted between the female screw and the support described.

According to a seventh aspect of the present invention, in any one of the first to sixth aspects, the supporting member is applicable to joints extending in the tunnel circumferential direction between the fireproof panels adjacent to each other in the tunnel axial direction. It is characterized in that it is arranged via a joint heat insulating material having contractibility.

The invention according to claim 8 is the invention according to any one of claims 1 to 7, wherein the end portions of the metal plates of the fire-resistant panel adjacent in the tunnel circumferential direction are arranged so as to overlap each other. It is characterized by

According to a ninth aspect of the present invention, in the invention according to any one of the first to eighth aspects, the joint portion between the metal plates of the fire-resistant panels adjacent to each other in the tunnel circumferential direction and the joint of the heat insulating material are deviated. It is characterized by being

The invention described in claim 10 is according to claims 1 to 9.
In the invention described in any one of 1, the heat insulating material has a two-layer structure, the joint of the first layer of the heat insulating material facing the metal plate is misaligned, and the primary cover is The joint of the heat insulating material of the second layer facing the work body and the joint of the heat insulating material of the first layer are deviated from each other.

The invention according to claim 11 is the invention according to claims 1 to 10.
In the invention described in any one of 1, the heat insulating material forming the refractory panel is shrinkable.

The invention according to claim 12 is the invention according to claims 1 to 11.
In the invention described in any one of 1, the joint of the heat insulating material between the panels adjacent in the tunnel circumferential direction, the joint of the heat insulating material adjacent in the tunnel axial direction, and the first adjacent in the tunnel circumferential direction.
Among the joints of the heat insulating material of the layer and the joints of the heat insulating material of the second layer, adjacent ones or two or more joints are characterized in that the adjacent heat insulating materials are compressed with each other to form the joint.

[0028]

According to the present invention, in a tunnel constructed by any method of a shield tunnel, a submerged tunnel or an excavated tunnel, a primary lining body made of reinforced concrete, iron or a composite of iron and concrete is applied to the tunnel. By installing a fire-resistant panel made of heat-insulating material with the inner surface of the tunnel covered with a metal plate inside, when a fire accident occurs in the tunnel, the high temperature heat in the tunnel due to the fire is Since it is cut off and transferred to the concrete of the primary lining body as much as possible, the concrete is protected from thermal shock and not only the explosion but also the thermal deterioration can be prevented. The heat shielding effect due to the metal surface covering the inner air side is remarkable, and as a result, not only the collapse of the tunnel is prevented but also the primary lining after the fire. Construction of the repair is not required.

In particular, when the fire-resistant panel of the present invention is installed in a tunnel, the heat-insulating material is protected by a corrugated metal plate covering the inside of the tunnel of the heat-insulating material. The fireproof panel can be securely fixed to the primary lining body side through the support tool that joins the jointed fireproof panels by closing the joints and the fixture that fixes the support tool to the primary lining body, and in service There is no fear of the insulation material falling. Furthermore, the fire-resistant panel is less likely to be broken even when subjected to impact forces during transportation and construction, and even when cleaning with water spray to maintain the aesthetics of the tunnel, dirt adheres to the surface of the fire-resistant panel. It can be resolved.

Further, according to the support structure of the present invention, the joints between the heat insulating materials and the mating portions of the metal plates are deviated from each other, so that the heat flow is generated in the gap on the back surface of the fireproof panel through these respective portions. The cause of getting around can be eliminated.

Further, the fire-resistant panel has a heat insulating property, a workability, a manufacturing cost, and a heat insulating material, a metal plate, a supporting member, a fixing member, and the like, which are combined with each other, due to the heat insulating property, the workability, the manufacturing cost, and the like. It has an even better effect in terms of safety during use, antifouling property, and landscape.

[0032]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described in detail with reference to the drawings.

FIGS. 1 and 2 show an outline of the case where the present invention is applied to an existing road tunnel constructed by a shield tunnel (hereinafter referred to as an existing tunnel). FIG. 1 shows a fireproof coating structure of an inner surface of a concrete lining. A front view and FIG. 2 are side views. FIG. 18 is a schematic front view showing a fireproof coating structure on the inner surface of the lining of an existing road tunnel (hereinafter referred to as an existing tunnel) constructed by a submerged tunnel.

Explaining each drawing, the existing tunnel 2 shown in FIGS. 1 and 2 has a reinforced concrete panel on the inner surface of the ground 1.
The inner wall of the tunnel is constructed by annularly constructing the primary lining body 3 made of a composite panel of iron and concrete.
A floor slab 4 is placed in the existing tunnel 2, and an upper surface of the floor slab 4 is a road floor 5 for driving a vehicle. The road floor 5 is usually composed of two or more lanes and a plurality of lanes. , The building limit 19 exists.

In the existing tunnel 2 constructed by the shield tunnel shown in FIGS. 1 and 2, the primary lining body 3 of the concrete panel is exposed on the inner wall surface of the tunnel before the fireproof repair. Also in the existing buried tunnel 2a made of a concrete block having a box-shaped cross section in FIG. 18, the intermediate partition wall 9 divides the left and right tunnel spaces 9a, and the primary lining body 3a such as concrete is exposed on the inner wall surface of the tunnel.

In the present invention, in the existing tunnels 2 and 2a provided for the road tunnel, the fireproof panel 6 is provided on the surface of the concrete inside the tunnel, and the structure of the fireproof panel 6 and the fireproof panel. There is a main element of the invention in the configuration of the support tool 11 for fixing 6 to the primary lining body 3 and the fixing tool (fixing bolt 12) thereof.

In the existing tunnel 2 shown in FIGS. 1 and 2, the fireproof panel 6 is formed into a panel shape (curved shape) as shown in the figure when it is fixed to the primary lining body 3. When 6 is installed, the joint portion 7 of the fireproof panel 6 and the joint portion 7a of the primary lining body 3 do not have to coincide with each other, and the joint portion from the side of the ground pressure 1 and the water stoppage is not necessary. It is rather preferable that 7, 7a are displaced. The figure shows an example in which the fireproof panel 6 and the joint portions 7 and 7a of the primary lining body 3 are displaced from each other. In the existing submerged tunnel 2a of FIG. 18, since the primary reinforced concrete lining body 3a is integrally molded with the formwork, the position of the joint portion 7 of the fireproof panel 6 configured in a panel shape (rectangular shape with flat sides) Does not matter in particular.

As schematically shown in FIGS. 1, 2 and 18, the fireproof panel 6 according to the present invention is provided with existing tunnels 2, 2.
The primary lining bodies 3 and 3a are laid and fixed tightly on the inner surfaces of the primary lining bodies 3 and 3a to form a heat insulating layer on the inner side of the tunnel. This heat insulating layer protects the concrete of the primary linings 3 and 3a from high temperature heat when a fire in the tunnel occurs,
As a matter of course, the fireproof panel 6 itself is required to have a structure that does not burn due to a fire, as long as it has a heat insulating function. Further, as shown in FIG. 1, since there is a construction limit 19 on the inner surface of the tunnel, the thickness of the fireproof panel 6 itself is limited. Therefore, it is desirable that the fire-resistant panel 6 be as thin as possible, rich in heat insulation and fire resistance, and light in weight. The fireproof panel 6 according to the present invention is configured to satisfy the above-mentioned various conditions from the above viewpoint as much as possible.

FIG. 3 and subsequent figures show three elements constituting the in-tunnel fireproof coating structure, a fireproof panel 6, a support tool 11 for connecting the fireproof panels 6 to each other in the tunnel axial direction, and a support tool 1.
The details of a fixture (a specific example of the fixing bolt 12 is shown in the figure) for fixing 1 to the primary lining body 3 are shown. In addition, the fireproof panel 6 shows what was formed in an arc shape as an example applied to the primary lining body of a shield tunnel.

The refractory panel 6 is integrated with the heat insulating material 8 which is covered with a metal plate 10 having a corrugated shape 13 (or a corrugated shape in some cases) in the tunnel axial direction on the inner side of the tunnel. The state (shown in FIG. 10 etc.) is said. In this case, the heat insulating material 8 and the metal plate 10 constituting the fireproof panel 6
The sizes of the heat insulating materials 8 are not necessarily the same, and a plurality of heat insulating materials 8 each having a predetermined size are joined in the circumferential direction of the tunnel through joints.
Are joined together in the tunnel circumferential direction at the joining portion, and the heat insulating material 8 and the metal plate 10 are referred to as a fireproof panel 6 in a laminated and integrated state. As described above, the size of the heat insulating material 8 (vertical length dimension) and the size of the metal plate 10 (vertical length dimension) forming the fireproof panel 6 are not particularly limited. From the aspects of manufacturing, construction, transportation, etc., it is manufactured with appropriate dimensions in the tunnel circumferential direction and tunnel axial direction. Further, in this case, the sizes of the heat insulating material 8 and the metal plate 10 are not necessarily the same, and therefore, the numbers of the heat insulating material 8 and the metal plate 10 that form one unit of the fireproof panel 6 are not necessarily the same. .

The heat insulating material 8 of the fireproof panel 6 is porous in order to obtain heat insulating property as a fireproof coating material, and its pores are mainly continuous bodies. As a specific example, it may be composed of one kind or two or more kinds of ceramic fibers and glass fibers. The heat insulating material 8 is mainly made of a material having shrinkability, but may have a single-layer structure or a multi-layer structure. When the heat insulating material 8 has a two-layer structure, the first layer on the side of the metal plate 10 is made of a non-shrinkable material and the second layer on the side of the primary lining body 3 is used.
The layer may be used as a material having a shrinkability, and both materials may be used in combination. Further, the second layer may be made of a heat insulating material having a lower heat resistance temperature than the first layer. (These details will be described later)

Further, the fact that the metal plate 10 of the refractory panel 6 has the wave shape 13 in the tunnel axis direction is one of the features of the present invention.
However, the wave shape 13 may be a curved surface or a flat surface, and a flat surface is advantageous in processing. More specifically, FIG. 3 and the following figures show an example of the metal plate 10 formed into a corrugated shape in which uneven portions are alternately continuous in the tunnel axis direction. Metal plate 10
With such a corrugated shape, compared to a flat metal plate, the bending strength of the metal plate itself is improved, and along with that, there is a weight reduction due to the thinning of the plate thickness of the metal plate. By inserting the heat insulating material 8, the support function of the heat insulating material 8 by the metal plate 10 is improved.

In the fireproof panel 6 of the present invention, the heat insulating material 8
The inner surface of the is covered with the metal plate 10 for the following reason. When a fire or high-temperature gas directly contacts the heat-resistant heat insulating material 8 during a fire, the high-temperature fire or high-temperature gas enters the inside of the porous body and raises the temperature of the back surface of the heat insulating material. By disposing the heat insulating material 8 on the back surface of the metal plate 10 on the inner side of the tunnel, the temperature rise of the heat insulating material 8 can be suppressed.

The maximum temperature during a fire in a tunnel is 1200.
It is predicted that the temperature is between 1 ° C. and 1350 ° C., and as the metal plate 10 to be applied for coating without melting at that temperature, a metal plate such as a stainless (SUS) thin plate or a carbon steel plate can be used.

The metal plate 10 is located on the air side in the tunnel and directly receives high temperature heat when a fire occurs in the tunnel.
At that time, it is preferable that the surface of the metal plate 10 is dull / roughened so that the heat is diffusely reflected and scattered without being directly reflected toward the heat source in the tunnel. As another example of irregular reflection processing, the surface of a stainless plate or carbon steel may be subjected to a treatment such as porous plating.

The construction process of the present invention and the configuration of each part will be specifically described with reference to FIG. In addition,
5 (A), FIG. 6 (A), FIG. 8 (A), FIG. 9 (A), and FIG. 11 (A) show the heat insulating material 8, the metal plate 10, and the tunnel inner surface in a flat state. However, this is an expanded view of each part for ease of explanation.
(B), FIG. 6 (B), FIG. 8 (B), FIG. 9 (B), FIG.
As shown in (B), the illustration with a predetermined curvature is
This is an actual arrangement mode.

The fire-resistant panel 6 of the present invention comprises a heat-insulating material 8 and a metal plate 10 having fire resistance and shrinkability in a tunnel.
The heat insulating material 8 and the metal plate 10 are each made to have a predetermined size. The heat insulating material 8 and the metal plate 10 are added to each other in the tunnel circumferential direction and the axial direction through the joint and the joint in the tunnel. Since the refractory panel 6 is constructed by the above, the construction process and the fixing means to the heat insulating material 8 and the metal plate 10 to the primary lining body 3 should be devised in order to perform the construction work reliably and quickly. is necessary.

This will be described below in order.

FIG. 5 shows the first step of the construction process.
The plurality of heat insulating materials 8 and the metal plate 10, which are constituent members of the fireproof panel 6 and are manufactured to have a predetermined size, are in a state of being temporarily held on the temporary jig 14 in a predetermined arrangement. 8 and the metal plate 10 are separated, and FIG. 6 shows a state in which the temporary holding work is completed. In the state of FIG. 6,
A string or other simple fixing means (not shown) is used to temporarily hold the state in which the heat insulating material 8 and the metal plate 10 are integrally assembled as shown in the figure. This work is usually done in a tunnel. FIG. 7A is a bottom view showing the heat insulating material 8 and the metal plate 10 in the first step.

To explain further, the heat insulating material 8 provided in the appropriate size may have a single-layer structure having a predetermined thickness, or may have a two-layer structure divided in the thickness direction. The heat insulating material 8 shown in each drawing shows an example of a two-layer structure including a first layer of heat insulating material 8a facing the metal plate 10 and a second layer of heat insulating material 8b facing the primary covering 3. In this case, the joint 15a of the first layer of the heat insulating material facing the metal plate 10 and the mating portion 16 between the metal plates (shown by a two-dot chain line in FIG.
(Shown in FIG. 4) and the joints 15b of the second layer of heat insulating material 8 facing the primary lining body 3 and the joints 15b of the first layer of heat insulating material 8 are also shifted. However, from the standpoint of preventing inward and outward displacement of both members that are continuous in a plane through a joint and improving the integrity, in particular, hot air during a fire in a tunnel is discharged from the joint gap to the primary cover 3 It is preferable because it surely prevents the transmission to the side.

The heat insulating materials 8a and 8b of the respective layers do not necessarily have to have the same size, and the joints between the first and second adjacent heat insulating materials 8a and 8b are not necessarily the same. 15a and 15b may be in a state of being pressed against each other without a gap, or may be in a state of slightly overlapping. In any case, since the heat insulating material 8 has a contractibility, the joint portion of the heat insulating material 8 is dense as shown in FIG. 6 when pushed by the metal plate 10 toward the primary lining body 3. There is no gap created by pressure integration, and no gap is created between the heat insulating materials 8a and 8b of the first and second layers.

As shown in FIGS. 3, 4 and 6, the metal plate 10 is formed so that the corrugations 13 are continuous in the tunnel axis direction. The metal plate 10 is provided with appropriate dimensions.
As shown in FIG. 5, the protrusions and the recesses at the ends are overlapped with each other in the circumferential direction of the tunnel to be added. In this case, the mating portion 16 (shown in FIG. 14) between the metal plates 10 is the first
The heat insulating materials 8a and 8b of the first layer and the second layer are provided so as to be displaced from the joints 15a and 15b.

Here, the matching portion 16 of the metal plates 10 in the tunnel circumferential direction will be described with reference to FIG. 5 (A), FIG. 7 and FIG. That is, the metal plate 10 is overlapped with the convex portion and the concave portion of the end portion in the tunnel circumferential direction, and the connecting bolt 19 is inserted into the bolt hole 19a formed in the convex portion of the wave of each metal plate 10 to attach the lock washer 19b. By fastening, metal plate 1
0 can be connected in the tunnel circumferential direction. It should be noted that the use of fasteners such as nuts is not denied if necessary. Further, at this time, as shown in FIG. 14, by forming the dimensions g and h, the heat insulating materials 8 are brought into close pressure contact with each other in the state where the metal plates 10 are joined in the circumferential direction of the tunnel, so that the joint is opened. Configured to not.

As described above, the heat insulating material 8 is porous in order to obtain heat insulating property as a fireproof coating material, and its pores are mainly continuous bodies. As a specific example, it may be composed of one kind or two or more kinds of ceramic fibers and glass fibers. Further, the heat insulating material 8 is made of a material having a compressibility, but when the heat insulating material 8 has a two-layer structure as shown in the figure, the heat insulating material 8a of the first layer on the metal plate 10 side is made compressible. The heat insulating material 8b of the second layer on the side of the primary lining body 3 may be used in combination as a material having a shrinkable property. Furthermore, the heat insulating material 8b of the second layer is
You may comprise with the heat insulating material whose heat resistant temperature is lower than the heat insulating material 8a of a layer.

The first reason for using a material having a compressibility (cushioning property) for the heat insulating material 8 is that the inner surface shape of the lining concrete and the back surface shape of the fireproof panel are inconsistent, or the inner surface of the lining concrete is uneven, and The heat insulating material is tightly attached to the inner surface of the lining concrete by tightening bolts with respect to the gap. The second reason is as follows. If the heat insulating material does not have cushioning properties when the steel sheet on the surface layer expands during heating during a fire or when the steel sheet is bent during use, the metal sheet 10 that is the surface steel sheet is used.
And the opening of the joint between the fiber that is the heat insulating material 8,
When a fire occurs, the hot air from the fire will infiltrate and the planned insulation cannot be secured.

The contractibility (cushioning property) of the heat insulating material 8 means
As mentioned above, when the steel sheet on the surface layer expands during heating during a fire, or when the steel sheet bends during service,
The fact is that it swells following it, and it has the property that it does not create a gap, and that it can ensure the planned thermal insulation even in the event of a fire.

Returning to FIG. 8, the description of the construction process of the present invention will be continued. After temporarily holding the heat insulating material 8 and the metal plate 10 in the temporary jig 14 in the first step of FIG. 6, the second step of FIGS. 8 to 10, the third step of FIGS.
Assembling the fireproof panel 6 into the primary lining body 3 through the fourth step of FIG. 14 and the fifth step of FIGS. 14 and 15.

In the second step of FIG. 8, the temporary jig 1
Before disposing the flat heat insulating material 8 and the metal plate 10 on the inner surface of the primary lining body 3 by 4, a plurality of fixing bolts 12 are fixed to the inner surface of the primary lining body 3 in advance. Fixing bolt 1
2 is for fixing the support tool 11 mentioned later. The fixing means of the fixing bolt 12 may be arbitrary, but in the embodiment, as shown in FIG. 16, an anchor nut 17 is inserted in the inner surface of the primary lining body 3 and the anchor nut 1
The fixing bolt 12 is screwed onto the screw 7. (Fixing bolt 12
(Detailed support structure will be described later)

As shown in FIG. 8, when the heat insulating material 8 and the metal plate 10 are arranged in pressure contact with the inner surface 3b of the primary lining body 3 by the temporary jig 14, each member is finally arranged in the second step of FIG. become. At this time, the fixing bolt 12 is
As shown in (A) and (B), the heat insulating material 8 is located along both edges of the heat insulating material 8 in the tunnel axial direction, and a plurality of heat insulating materials 8 are arranged at predetermined intervals in the tunnel circumferential direction.

Next, in the third step shown in FIGS. 11 and 12, the fixing bolt 12, the band-shaped joint heat insulating material 18 which is long in the tunnel circumferential direction, the support tool 11 and the nut 20 which are also long in the tunnel circumferential direction. And the like are used to add and fix the fireproof panel 6 in the tunnel circumferential direction and the tunnel axial direction. The temporary jig 14 is the third jig shown in FIG.
Remove when the initial work on the step is complete.

The third step will be further described with reference to FIGS. 11, 12 and 16 and 17.

First, as shown in FIGS. 11 and 12, a band-shaped joint heat insulating material 18, which is long in the circumferential direction of the tunnel, is applied to both side edges of the heat insulating material 8, and bolt insertion holes opened at the same intervals as the fixing bolts 12. 21 (shown in FIG. 17) is fitted to the fixing bolt 12. The joint heat insulating material 18 has a width capable of simultaneously pressing both side edges of the heat insulating materials 8 adjacent to each other in the axial direction of the tunnel, and has a shrinkability, so that the joint heat insulating material 18 closely fits to both side edges of the heat insulating material 8. Can be pressed.

The support 11 which is one of the main elements of the present invention is applied onto the joint heat insulating material 18 in a band shape. Support tool 11
Is a steel plate, has a predetermined width, and has a strip shape that is long in the tunnel circumferential direction. In the support tool 11 shown in the embodiment, the central portion is bulged in the longitudinal direction, and bolt holes 22 are formed at predetermined intervals in the ridge portion 11a. The fixing bolt 12 which is applied to the joint heat insulating material 18 and fits the bolt long hole 22 of the mountain portion 11a into the fixing bolt 12, and which protrudes inside the mountain portion 11a.
The nut 20 is screwed in.

The support 11 may be a flat plate, but FIG.
As shown in (C), it is advantageous to have the ridges 11a (protrusions) in terms of light weight and strength. Further, the ridges 11a have a curved surface along the circumference in the width direction or have a narrow width. In some cases, curved surface processing is not required. At R5m, the curved surface processing length is preferably up to about 3m from the viewpoint of construction. The reason is that the bolts are inclined inward (toward the center of the tunnel), so when the support 11 is attached to the metal plate 10, the support 11 is moved in the radial direction from the center of the tunnel. 11
When attaching the to the metal plate 10, the bolt holes 22 of the support 11 are seen in the radial direction from the center of the circle, and the fixing bolt 12
It is necessary to secure the length of the slotted hole 22 for the bolt of the support tool 11 by the length of the positional deviation between the tip and the base end of the bolt. Therefore, the size of the slotted hole 22 for the bolt becomes very large and This is because the strength of the tool 11 is reduced.

At this time, the step between the ridge portion 11a and both side portions 11b of the support tool 11 has substantially the same dimension as the thickness width (height of the corrugated portion of the wave) of the metal plate 10 having a continuous waveform in the tunnel axis direction. Since it is provided, as shown in FIG. 13 (described later), when the nut 20 is tightened to the fixing bolt 12, both side portions 11b of the support tool 11 are attached to the metal plate 10 arranged on the space inside the tunnel of the heat insulating material 8. It is provided so that both adjacent edges can be pressed and fixed at the same time.

According to FIG. 16, the fixing bolt 12 and the nut 2
The fixing structure by 0 will be described in detail. A fixing bolt 12 screwed to an anchor nut 17 inserted into the primary lining body 3 is fitted with a pipe-shaped space retainer (spacer) 23, and a lock washer. It is provided by 24 so as not to escape from the fixing bolt 12. The space holder 23 is provided to allow the heat insulating material 8 having shrinkability to maintain its original thickness, and the thickness of the heat insulating material 8 and the length of the space holder 23 are substantially the same.

Next, the joint heat insulating material 18 is placed on the lock washer 24, the mountain portion 11a of the supporting tool 11 is applied thereon, and the supporting tool 1 is placed inside the mountain portion 11a.
A washer 25 having a cross-sectional shape similar to that of No. 1 is arranged, a washer 26 is applied to the inside of the washer 25, the above-mentioned nut 20 is fastened, and a lock washer 27 is provided from above to prevent the nut 20 from loosening. By fastening the nut 20 in this manner, both side edges 11b of the support tool 11 press both side edges of the heat insulating material 8 along the tunnel axial direction, and the heat insulating material 8 and the metal are connected via the support tool 11 and the fixing nut 20. The fireproof panel 6 such as the plate 10 can be securely fixed to the primary lining body 3. In this case, the amount of deformation of the shrinkable heat insulating material 8 can be made constant by the space holders 23, and thus it is possible to easily ensure uniform heat insulating properties and workability.

FIG. 17 shows the arrangement of the bolt holes 22 provided in the support 11. If the fixing bolt 12 is fitted through the bolt hole 22 as described above, the opening of the bolt hole 22 can be moved relative to the fixing bolt 12 when the support tool 11 expands in the event of a fire. It is possible to eliminate the problem that the tool 11 is bent and deformed and the side edge of the heat insulating material 8 cannot be pressed and fixed. Support tool 11
As shown in FIG. 17 (B), the long holes 22 for bolts located at both ends of the long length are formed in a hole shape in which the middle is cut in half, and the same shape of the end portion of the other support tool 11 is formed. The long holes 22 for bolts are formed by joining the semi-open holes. Further, as shown in FIG. 17C, a short support tool 11c having an opening 22a having a shape obtained by cutting the middle of the long hole in half is arranged at the position of the fixing bolt 12 to close the joint. It may be configured to do so.

FIG. 13 shows a fourth step in which the heat insulating material 8 and the metal plate 10 of the two refractory panels 6 are connected to each other by the support 11, the joint heat insulating material 18 and the fixing nut 20 in a dense manner in the axial direction of the tunnel. The state fixed to the inner surface of the lining body 3 is shown. At the time of connecting the fireproof panel 6 in the tunnel axial direction, when the support tool 11 is attached to the fixing bolt 12 fixed to the primary lining body 3 via the anchor nut 17, the joint between the heat insulating material 8 in the tunnel circumferential direction is made. You can work while confirming that it is not open.

FIGS. 14 and 15 show, as a fifth step, a step of connecting the mating portion 16 at the end of the metal plate 10 with the connecting bolt 19 and the lock washer 19b (shown in FIG. 5A). That is, as described above, the metal plate 10
Bolt holes 19a formed by overlapping the convex portions and the concave portions at the end portions in the circumferential direction of the tunnel and forming the corrugated convex portions of each metal plate 10.
The metal plate 10 is connected in the circumferential direction of the tunnel by inserting the connecting bolt 19 into and connecting the lock washer 19b. At this time, as shown in FIG. 14, by forming the dimensions g and h, the heat insulating materials 8 are also brought into close pressure contact with each other in the state where the metal plates 10 are bonded in the tunnel circumferential direction, so that the joint is not opened. Is configured.

Further, at this time, the support tool 11 and the joint heat insulating material 18 are also fixedly connected to the inner surface of the primary lining body 3 by tightly connecting them in the axial direction of the tunnel with the fixing nut 20. The anchor nut 1 is also used for connecting the fireproof panel 6 in the tunnel circumferential direction.
When attaching the support tool 11 to the fixing bolt 12 fixed to the primary lining body 3 via 7, it is possible to perform work while confirming that the joint between the circumferential directions of the heat insulating material 8 in the tunnel is not open.

When the work for fixing the fireproof panel 6 to the primary lining body 3 in the circumferential direction of the tunnel is completed in a predetermined section in the tunnel axial direction, the above-mentioned work is repeated in the next section, and this is continued. A fireproof coating structure is constructed over a long distance in the tunnel.

[0073]

EXAMPLES The in-tunnel refractory coating structures according to the present invention and the comparative example were manufactured, respectively, and the effects thereof were compared, which will be described below.

The present invention: The size of the [metal plate] is 714 (width in the axial direction of the tunnel) × 25.
00 (width in the circumferential direction of the tunnel), plate thickness of 0.5 mm, overlapping margin of 38 mm (overlap margin of the above 2500 width), circular arc 12
348 = (5 sheets × (2500−38) +38), 5 sheets ×
2 arcs = 10 sheets, wave height of metal plate 15 mm, wave pitch: 68 sine curve wave, R processing. The material is SUS43
0, surface treatment: antiglare treatment (dull processing).

[Supporting tool] 2462 × 90 (5 arcs / arc), plate thickness 1.2 mm, peak height 12 mm, 3 arcs were applied. An opening 10 × 20 (oval) of a long hole for a bolt, which is divided into 5 by dividing 2462 into a bolt opening. 492.4 × 5 = 2462 (the opening for the bolt is on the ridge) The material is SUS430.

[Heat Insulation Material] Basic material 760 × 1210 thickness 18 mm, polyethylene bag, two layer heat insulation layer type, the first layer and the second layer are jointly displaced (peripheral end portions have appropriate width and different length) Got ready). Joint heat insulating material 50 × 1210 (basic length) Thickness 6mm Polyethylene bag, (circumferential end is
Width and length are prepared as appropriate) Material Blanket made by Nihonka Thermal Ceramics (Grade 1400)

[Fixing tool (bolt)] Diameter 6 mm, length 6
Uses round steel with 5 mm full thread. The thickness of the heat insulating material was set to 30 mm by the spacing ring. Material SUS430

[Spacing ring] Length 30 mm, material
SUS430

Comparative Example: [Metal plate] Dimensions are 782 (width in the tunnel axis direction) × 25
00 (width in the tunnel circumferential direction). Plate thickness 0.5 mm, circumferential overlap margin 38 mm (one side 19 mm), axial overlap margin 34 m
m (17 mm on each side) 5 x 2 arcs = 10. Wave height of metal plate 15mm, 68mm sine curve wave, R processing,
Bolt port, circle with a diameter of 10 mm (opened during construction), location of bolt port: 150,51 mm from the metal plate corner, 4
In addition to the holes, in the peripheral portion of the metal plate, they were provided at intervals of 550 in the circumferential direction (3 holes × 2) and at intervals of the axial directions 204, 204, 272 (2 holes × 2). Position of ridge (attach to bolt embedded in primary lining body). The material is SUS430, surface processing: anti-glare treatment (dull processing).

[Support] The support is not used. Instead, the bolt holes at the positions of the metal plates were opened so as to correspond to the above-mentioned 14 holes / one sheet (metal plate) for fixing a corresponding number of each metal plate.

[Heat Insulation Material] Basic material 760 × 1210 thickness 36 mm, packed in polyethylene bag, single layer heat insulation (bonded on a metal plate with double-sided tape). Material Blanket (grade 1400) made by Nikka Thermal Ceramics.

[Fixing tool (bolt)] Diameter 6 mm, length 55 mm from the surface of the primary lining body. Insulation thickness of 3 by visual registration
It was set to 0 mm. Material SUS430

[Spacing ring] Not used

The fire resistance evaluation experiment was conducted as follows. The expected fire curve is shown in Fig. 19. Furnace body: 2000 (width) x 3500 (length) x 750 height, segment size: 1500 (width) x (1000 + 10)
00) × 250 (thickness), 36 mm steel shell (H type, web thickness 19 mm), 6 mm steel plate, concrete filled. Between segments: Water-stop material (Asahi Denka Kogyo Co., Ltd.) ADEKA ULTRA SEAL, Furnace body: Segment / fireproof coating structure is installed on the tunnel ceiling, and three burner ports are installed at the end of the floor slab. A fire grate was provided with three flues made of refractory bricks. Insulation was placed around the area. Propane gas 20 Nm ³ / H
r (maximum gas amount), air 500 Nm ³ / Hr (maximum gas amount), all 3 ports.

Effect: [Workability of joints for heat insulating material] The present invention: The edges and joints of the heat insulating material are visually observed, compression between rings and compression of joints in layers between the first layer and the second layer are reliable. Can be carried out. Further, the thickness of the heat insulating material is kept constant by the spacing ring, and a predetermined heat insulating ability is held.

Comparative Example: The metal plate bolt port is blocked by the heat insulating material, and the bolt cannot be seen, so that the bolt cannot be passed as planned. Furthermore, the joints of the heat insulating material are covered with a metal plate, and it is not possible to confirm the compression work or the joints are closed.

[Aesthetic] The present invention: In order to connect the ridges of the corrugated metal plate in the circumferential direction,
Since it is integrated as a curved body to increase the surface rigidity, the force exerted on the metal plate by the reaction of the heat insulating material is suppressed and the deformation is inconspicuous, resulting in an excellent appearance.

Comparative example: about 550 mm around the periphery by bolts
When held at intervals, parts other than the bolt holding part were swollen and warped, and it was found that the appearance was not good. It should be noted that it is not economically advantageous to add a bolt retainer in the vicinity of the center of the panel so that the bending is not noticeable.

[Fire resistance] The present invention: Since each corner of the metal plate is supported by a thick metal, soft deformation at high temperature is small, hot air does not enter from joints, and fire resistance is exhibited. To be done.

Comparative Example: The corner portions of the metal plate from the bolt holding portion are exposed to high temperature and soften, so that hot air easily enters and fire resistance cannot be sufficiently exhibited.

As described above, the effectiveness of the in-tunnel fireproof coating structure of the present invention was confirmed by the examples as compared with the comparative examples.

[0092]

The present invention having the above-mentioned structure has the following effects.

Inside the primary lining body made of reinforced concrete, iron or a composite of iron and concrete, which was constructed in a shield tunnel, a submerged tunnel, or an excavation tunnel, the inside surface of the tunnel was covered with a metal plate. By installing a fireproof panel consisting of the heat insulating material, when a fire accident occurs in the tunnel, the high temperature heat in the tunnel due to the fire is blocked by the fireproof panel and is not transferred to the concrete of the primary lining body. , The concrete is protected from heat and has the effect of not being thermally deteriorated by evaporation of water.

In particular, the heat insulation effect due to the fact that the surface inside the tunnel of the heat insulating material is covered with the metal plate is remarkable,
As a result, there is no need to repair the primary lining body after a fire, and the cost required for the repair work can be reduced and the economic loss due to suspension of traffic in the tunnel can be eliminated.

The fire-resistant panel has a heat insulating property, workability, manufacturing cost, etc. by the laminated structure of each heat insulating material and the composition, combination, etc. of each heat insulating material described in each of claims 2 and below. It produces an excellent effect. That is, the heat insulating material is a combination of one or more of amorphous refractory, refractory board, ceramic fiber and glass fiber,
In addition, these materials are made of a material having a shrinkability or a non-shrinkability, and further, a second heat insulating material of the same material as this heat insulating material is laminated on the heat insulating material, or this second heat insulating material is laminated. The heat insulating material of is composed of a heat insulating material having a lower heat resistance temperature than the heat insulating material,
Furthermore, by forming the shape of the metal plate into a corrugated cross-section, it is possible to expect further effects in terms of heat insulation, workability, manufacturing cost, etc. due to the interaction.

Further, the structure of covering the heat insulating material, which is the fireproof panel having the metal plate used inside the primary lining body, eliminates the fear of dropping during use.

Further, the structure of covering the heat insulating material, which is the fireproof panel having the metal plate used inside the primary lining body, is a function in the cleaning work for maintaining the aesthetics of the tunnel. Can be dropped easily.

Furthermore, according to the support structure of the present invention, since the joints between the heat insulating materials and the mating portions of the metal plates are deviated from each other, the heat flow through the respective portions to the gap on the back surface of the fireproof panel. The cause of getting around can be eliminated.

Further, the fire-resistant panel has a heat insulating property, a workability, a manufacturing cost, a heat insulating property, a metal plate, a supporting member, a fixing member, and the like, which are combined with each other by the mutual constitution of the members. It has an even better effect in terms of safety during use, antifouling property, and landscape.

[Brief description of drawings]

FIG. 1 is a front view of a fireproof coating structure on an inner surface of a concrete lining of an existing road tunnel constructed by a shield tunnel.

FIG. 2A is an enlarged cross-sectional view taken along the line aa in FIG.
(B) is a front view of the same tunnel as in FIG. 1.

FIG. 3 is a schematic perspective view in which a plurality of metal plates of FIG. 1 are assembled in an arc shape.

FIG. 4 is a perspective view of a single body of the metal plate of FIG.

5A is a side explanatory view showing a state in which the state in the middle of the first step of the construction process for assembling each member of the fireproof coating structure is flatly developed, and FIG. 5B is the actual state of FIG. It is explanatory drawing which shows the circular arc arrangement aspect arrange | positioned along the circular arc of a tunnel inner surface as an arrangement form.

FIG. 6 (A) is a side explanatory view showing the latter half state of the first step in a flat state, and FIG. 6 (B) shows an actual arrangement of FIG. It is explanatory drawing which shows the circular arc arrangement aspect arrange | positioned as.

FIG. 7A is a bottom view of FIG. 6A, and FIG.
It is a bb sectional view of (A).

FIG. 8A is a side explanatory view showing a state in the middle of the second step in a flat state, and FIG. 8B shows an actual arrangement form of FIG. 8A along an arc of a tunnel inner surface. It is explanatory drawing which shows the circular arc arrangement aspect arrange | positioned.

9A is a side explanatory view showing a state in which the state at the end of the second step is flatly developed, and FIG. 9B is a diagram showing FIG.
FIG. 3 is an explanatory diagram showing an arc arrangement mode in which the arc is arranged along an arc on the inner surface of the tunnel as an actual arrangement form of FIG.

FIG. 10A is a bottom view of FIG. 9A, and FIG.
[Fig. 3] is a sectional view taken along line cc of (A).

FIG. 11 (A) is a side explanatory view showing a state in the middle of the third step in a flat manner, and FIG. 11 (B) shows an arc on the inner surface of the tunnel as the actual arrangement of FIG. 11 (A). Explanatory drawing which shows the circular arc arrangement aspect arrange | positioned along (C),
It is a dd sectional drawing of (A).

12A is a bottom view of FIG. 11A, and FIG.
[Fig. 3] is a sectional view taken along line ee of (A).

FIG. 13 (A) is a bottom view showing a state in which the refractory panels are joined in the tunnel axial direction as the third step, (B).
[Fig. 6] is a sectional view taken along line f-f of (A).

FIG. 14 is a bottom view showing a state where the fireproof panels are being joined in the tunnel circumferential direction as a fourth step.

FIG. 15 is a bottom view showing a state in which fireproof panels are joined in the tunnel circumferential direction as a fourth step.

16 (A) is an explanatory view showing members such as a fixing bolt, a space holder, a support tool, a washer, and a nut separately, and FIG. 16 (B) is a sectional view after assembly.

FIG. 17 (A) is a front view of an intermediate portion of a long support tool,
(B) is a front view of the entire length of the support shown by omitting a part of the intermediate portion, and (C) is a front view showing a short support as another example.

FIG. 18 is a front view of a fireproof coating structure on the inner surface of a concrete lining of an existing road tunnel constructed by a submerged tunnel as another construction example different from FIG.

FIG. 19 is a diagram showing a fire assumed curve in a graph.

[Explanation of symbols]

1 ground 2 Existing road tunnel 2a Existing road tunnel 3 Primary lining body 3a Primary lining body 3b Inner surface of primary lining body 4 floor slabs 5 road floor 6 Fireproof panel 7 joints 7a joint 8 insulation 8a 1st layer insulation 8b 2nd layer insulation 9 Intermediate partition wall 10 metal plate 11 Support 11a Yamabe 11b both sides 12 Fixture (fixing bolt) 13 wave shape 14 Temporary jig 15a 1st layer joint 15b Second layer joint 16 mating parts 17 Anchor nut 18 joint insulation 19 Connection bolt 19a Bolt hole 19b lock washer 20 nuts (locking nuts) 21 Bolt insertion hole 22 bolt long hole 23 Interval holder 24 lock washers 25 washers 26 washers 27 lock washers

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Noriyuki Hirosawa             2-6-3 Otemachi, Chiyoda-ku, Tokyo New Japan             Steelmaking Co., Ltd. (72) Inventor Minoru Nakamura             2-6-3 Otemachi, Chiyoda-ku, Tokyo New Japan             Steelmaking Co., Ltd. (72) Inventor Akira Kawamura             2-6-3 Otemachi, Chiyoda-ku, Tokyo New Japan             Steelmaking Co., Ltd. F term (reference) 2D055 CA04 KB03 KB07 LA17

Claims (12)

[Claims] 1. A fireproof coating structure for a tunnel used inside a primary lining body made of reinforced concrete, iron or a composite of iron and concrete, which is constructed in any one of a shield tunnel, a submerged tunnel and an excavated tunnel. , A fire-resistant panel made of a heat insulating material whose inner surface in the tunnel is covered with a metal plate, and extending in the tunnel circumferential direction, joins the fire-resistant panels adjacent to each other in the axial direction of the tunnel, and through the fixture, A fireproof coating structure in a tunnel, comprising a support for fixing a fireproof panel to a primary lining body, wherein the metal plate has a corrugated shape in a tunnel axial direction. 2. The support member is a flat plate having a predetermined length and a predetermined width, or a predetermined length having a ridge in the central portion along the longitudinal direction,
The fireproof coating structure in a tunnel according to claim 1, wherein the fireproof coating structure is formed of a flat plate having a predetermined width. 3. The in-tunnel fireproof coating structure according to claim 1 or 2, wherein the support has an opening for inserting a fixture having a size that is movable with respect to the fixture. 4. The fixing tool is a bolt, and the female screw embedded in the primary lining body and the supporting tool are fixed by the bolt. Refractory coating structure in tunnel as described in. 5. A spacer is provided between the primary lining body and the support to define the thickness of the heat insulating material, and the support is fixed to the primary lining. The fireproof coating structure in a tunnel according to any one of claims 1 to 4, which is characterized in that. 6. The tunnel according to claim 5, wherein the spacing member is made of a cylindrical body and is fitted to the bolt between the female screw according to claim 4 and the support member. Internal fireproof coating structure. 7. The support is arranged between the fireproof panels adjacent to each other in the axial direction of the tunnel, with a joint heat insulating material having contractibility in a joint extending in the circumferential direction of the tunnel. The fireproof coating structure in a tunnel according to any one of claims 1 to 6. 8. The fireproof coating in a tunnel according to claim 1, wherein the end portions of the metal plates of the fireproof panels adjacent to each other in the tunnel circumferential direction are arranged so as to overlap each other. Construction. 9. The fireproofing in a tunnel according to claim 1, wherein the joint portions of the metal plates of the fireproof panels adjacent to each other in the circumferential direction of the tunnel are deviated from the joints of the heat insulating material. Coating structure. 10. The heat insulating material has a two-layer structure, and the joint of the first layer of the heat insulating material facing the metal plate is misaligned with the metal plate and the second facing the primary lining body. 10. The tunnel fireproof coating structure according to any one of claims 1 to 9, wherein the joints of the heat insulating material of the layer and the joints of the heat insulating material of the first layer are deviated from each other. 11. The fireproof coating structure in a tunnel according to claim 1, wherein the heat insulating material forming the fireproof panel has shrinkability. 12. A joint for a heat insulating material between panels adjacent to each other in the circumferential direction of the tunnel, a joint for a thermal insulating material adjacent to the axial direction of the tunnel, a joint for a first insulating layer adjacent to each other in the circumferential direction of the tunnel, and a heat insulating layer for the second layer. Inside of the tunnel according to any one of claims 1 to 11, characterized in that, for any one or two or more joints among the joints of the material, the adjacent heat insulating materials are compressed with each other to form the joint. Fireproof coating structure.