JP7249864B2 - Fireproof covering structure - Google Patents

Description

The present invention relates to a fireproof coating structure between boxes such as tunnels.

RC (reinforced concrete) boxes (hereinafter referred to as RC boxes) are sometimes connected to build tunnels. A joint is provided.

A fireproof covering structure is provided on the inner hollow side of the flexible joint to protect the boundary from fire. For example, in Patent Document 1, when constructing a tunnel by arranging RC skeletons in the tunnel axis direction, a stretchable joint material (flexible joint) is provided between the RC skeletons, and a water stop material and a fireproof plate are provided on the inner space side. to be placed.

Patent No. 5687894

The above is an example of the boundary between RC boxes, but in recent years, from the viewpoint of workability, the use of SC (steel-concrete composite structure) boxes (hereinafter referred to as SC boxes) is also being considered. many. The SC box is a steel shell filled with concrete.

In addition to fire resistance, the functions required for the fireproof coating structure are waterproofing to prevent water from leaking into the interior space from the boundary between the boxes, and movement to follow the relative displacement between the boxes. There is a need for a fireproof covering structure that reasonably satisfies these performances not only in the case of connecting RC boxes but also in the case of connecting an RC box and an SC box.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object thereof is to provide a fireproof coating structure that can reasonably satisfy fire resistance, water stoppage, and mobility.

The present invention for achieving the above-mentioned objects is a fireproof covering structure provided at a boundary portion having a flexible joint between a first box body and a second box body, wherein A cover provided on the inner space side of the first and second boxes, and a fireproof coating layer provided on the surface of the inner space side of the cover, and one end of the cover is It is fixed to the first box, and the other end of the cover is arranged on the inner hollow side of the second box so as to be movable with respect to the second box, and the A portion corresponding to the boundary portion has a recess recessed toward the inner space, and the refractory coating layer is formed of mortar and does not stop water between the boundary portion and the recess of the cover. and a fireproof coating structure characterized in that water that has entered from the boundary into the inner space is drained by the recess .

In the fireproof coating structure of the present invention, a cover is provided at the boundary between the first and second boxes, and a fireproof coating layer is provided on the inner side surface of the cover to protect the boundary between the boxes from fire. can be protected. In addition, one end of the cover is fixed to the inner hollow side surface of the first box, and the other end is movable with respect to the second box, so that the cover can be fixed to the relative displacement between the boxes. can be reliably followed. Furthermore, by providing a recess at a position corresponding to the border of the cover and functioning as a drain gutter, the water entering from the border between the two boxes can be reliably prevented from leaking into the inner space. As a result, it is possible to provide a fireproof coating structure that reasonably satisfies fire resistance, water stoppage, and mobility.

For example, the first box is formed by filling concrete in the steel shell, the second box is formed of concrete, and the fireproof coating layer is the inner hollow side surface of the first box is provided on the surface of the inner space side of the cover continuously from .
Although the present invention can be applied to the boundary between RC boxes, it is also desirable to apply it to the boundary between an SC box and an RC box. A coating layer is provided to integrally form the fireproof coating of the SC housing and the cover.

The other end has a long hole along the direction in which the first and second boxes are arranged, and the other end uses the anchor member passed through the long hole to secure the second It is desirable to be attached to the inner hollow side of the box body.
As a result, the end of the cover is prevented from being detached from the second box, and the anchor member slides in the long hole when the two boxes are relatively displaced, so that the relative displacement is not hindered.

It is desirable that the cover has a cover that covers the long hole on the inner hollow side of the other end.
As a result, the refractory coating does not prevent the anchor member from sliding within the long hole.

It is preferable that a gap is provided between the other end of the cover and the inner side surface of the second box, and a water stop material is arranged in the gap.
By providing a gap between the end of the cover and the second box, the end of the cover can be smoothly moved with respect to the second box. In addition, water leakage to the inner space can be prevented by providing a water stop material.

ADVANTAGE OF THE INVENTION According to this invention, the fireproof coating structure which can satisfy|fill fireproofness, a waterproofness, and mobility reasonably can be provided.

The figure which shows the tunnel 1. FIG. The figure which shows the fireproof covering structure 10. FIG. 4 is a diagram showing an end portion 11b of the cover 11; FIG. 4A and 4B show a method of forming the fireproof covering structure 10;

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

(1. Tunnel 1)
FIG. 1(a) shows a tunnel 1 having a fireproof cladding structure according to an embodiment of the present invention. A tunnel 1 is buried in the ground 2, and is configured by arranging an RC box 3 and an SC box 5 in the axial direction of the tunnel and connecting adjacent boxes.

The SC box 5 (first box) is formed by filling concrete in a steel shell that functions as an embedded formwork. On the other hand, the RC box body 3 (second box body) is formed by arranging reinforcing bars in a formwork and pouring concrete.

As shown in FIG. 1(b), the tunnel 1 has a top slab a, a bottom slab b, and a side wall c in a cross section orthogonal to the tunnel axis direction, and this cross-sectional shape is formed by the RC box 3 and the SC box 5. are almost the same.

The fireproof coating structure of this embodiment is provided between the top slabs a and the side walls c of the RC box 3 and the SC box 5, as indicated by the dotted line in FIG. 1(b).

(2. Fireproof covering structure 10)
FIG. 2 is a diagram showing the boundary between the top plate a of the SC box 5 and the RC box 3, and is a cross-sectional view of the boundary along the tunnel axis direction.

As described above, the SC box 5 is formed by filling the steel shell 51 with the concrete 52 , and the steel shell 51 is provided with reinforcing ribs or the like embedded in the concrete 52 . The RC box body 3 is made of concrete 31, and reinforcing bars and the like are arranged inside.

At the boundary between the SC box 5 and the RC box 3, a joint material 9 is provided between the end face of the SC box 5 and the end face of the RC box 3. The joint material 9 is a member having elasticity such as resin or rubber, and constitutes a flexible joint between the boxes.

The joint material 9 is provided so as to retreat to the outside (ground 2 side) of the surface of the SC box 5 and the RC box 3 on the side of the inner space 100 (hereinafter sometimes referred to as the inner space surface). A space 6 in which the end face of the SC box 5 and the end face of the RC box 3 are exposed is provided on the inner space 100 side of the joint material 9 .

The fireproof covering structure 10 is a boundary between the SC box 5 and the RC box 3 in order to protect the joint material 9 and the steel shell 51 on the end surface of the SC box 5 exposed in the space 6 from fire. provided in

The fireproof coating structure 10 has a cover 11, a fireproof coating layer 17, and the like.

The cover 11 is provided on the inner space 100 side of both boxes so as to straddle the boundary between the SC box 5 and the RC box 3 . The cover 11 is made of a metal plate such as stainless steel.

One end 11a of the cover 11 is fixed to the inner air surface of the SC housing 5 by a fixing member 112 such as a bolt or nut.

The other end 11 b of the cover 11 is arranged on the inner space 100 side of the RC box 3 . A gap 12 is provided between the end portion 11b and the inner air surface of the RC box body 3, and a water stop material 13 such as packing is arranged in the gap 12.

The end portion 11b has a long hole 118 along the tunnel axis direction (the direction in which the SC box 5 and the RC box 3 are arranged), and an anchor member 113 and nuts 114a and 114b passed through the long hole 118 are used. is attached to the inner air surface of the RC box body 3.

A folded portion 11d folded back toward the inner space 100 is formed at the tip of the end portion 11b of the cover 11 in the tunnel axial direction.

A box-shaped cover 11e that covers the long hole 118 is provided on the inner space 100 side of the end portion 11b of the cover 11 . A hole 119 is provided in the surface of the cover 11e on the inner space 100 side.

An intermediate portion 11c between both ends 11a and 11b of the cover 11 is positioned corresponding to a boundary portion between the RC box 3 and the SC box 5, and has a concave portion recessed toward the inner space 100 side. This recess has a role of a gutter for draining water that has entered from the boundary between the RC box 3 and the SC box 5 to the inner space 100 side.

The fireproof coating layer 17 is continuous from the inner space surface of the SC box 5 and is provided so as to cover the surface of the cover 11 on the inner space 100 side. The refractory coating layer 17 is formed by spraying a refractory material such as mortar. In order to reinforce the refractory coating layer 17 and prevent it from coming off, it is possible to bury a stainless steel mesh inside the refractory coating layer 17, or to provide a glass fiber net on the surface of the refractory coating layer 17 on the inner space 100 side. be.

FIG. 3 is a cross-sectional perspective view of the end portion 11b of the cover 11 with the refractory coating layer 17 omitted, showing a tunnel longitudinal section through the location of the cover 11e.

In this embodiment, the end portion 11b of the cover 11 is movable with respect to the RC box 3 at the time of relative displacement between the boxes, so that the cover 11 can follow the relative displacement between the boxes.

That is, when the boxes are relatively displaced, the end portion 11b of the cover 11 moves in the direction of the long hole 118 as shown by the arrow A, substantially parallel to the inner air surface of the RC box 3. At this time, the anchor The member 113 relatively moves (slides) inside the long hole 118 . Since the surface of the SC box 5 is a steel shell 51, the fireproof coating layer 17 is required, but the surface of the RC box 3 is concrete and the fireproof coating layer can be omitted. is not hindered.

A male screw is provided on the shaft of the anchor member 113, and nuts 114a (see FIG. 2) and 114b are provided so as to sandwich the end portion 11b of the cover 11 therebetween. As a result, the end portion 11b of the cover 11 is attached to the inner air surface of the RC box body 3. As shown in FIG.

A doughnut-shaped washer plate 114c is arranged between the nut 114b and the end portion 11b of the cover 11. As shown in FIG. The shaft diameter of the anchor member 113 is smaller than the width of the long hole 118, and the outer diameters of the nuts 114a and 114b and the washer plate 114c are larger than the width of the long hole 118.

(3. Method for forming fireproof covering structure 10)
In order to form the fireproof covering structure 10, as shown in FIG. One end 11 a of the cover 11 is fixed to the inner air surface of the SC box 5 by a fixing member 112 .

Also, the anchor member 113 is passed through the elongated hole 118 of the other end portion 11b of the cover 11, and a nut 114b and a washer plate 114c (see FIG. 3) are attached to the tip protruding from the elongated hole 118. As shown in FIG. The nut 114b and the washer plate 114c are inserted through the hole 119 of the cover 11e. After the nut 114b and the washer plate 114c are attached, the hole 119 is closed with a sealing material (not shown) such as tape. A water stop material 13 is attached to the cover 11 in advance.

After that, the fireproof coating layer 17 is sprayed on the inner space 100 side surface of the cover 11 so as to be continuous from the inner space surface of the SC box 5 . By providing the above-described stainless steel mesh or glass fiber net as necessary, the fireproof covering structure 10 shown in FIG. 2 is formed.

As described above, in the fireproof coating structure 10 of the present embodiment, the cover 11 is provided at the boundary between the SC box 5 and the RC box 3, and the fireproof coating layer 17 is provided on the inner space 100 side surface of the cover 11. , the boundary between the SC box 5 and the RC box 3 can be protected from fire. One end 11a of the cover 11 is fixed to the inner air surface of the SC box 5, and the other end 11b is movable with respect to the RC box 3. can be reliably followed. Further, a recess is provided at a position corresponding to the boundary of the cover 11, and this recess functions as a drain gutter, thereby reliably preventing water that has entered from the boundary between the two boxes from leaking into the inner space 100. can do. As a result, the fireproof coating structure 10 is provided which can reasonably satisfy fire resistance, water stoppage, and mobility.

The fireproof coating structure 10 is preferably applied to the boundary between the SC box 5 and the RC box 3 as in this embodiment, and the fireproof coating layer 17 is provided so as to be continuous from the inner air surface of the SC box 5, The fireproof coating of the SC box 5 and the cover 11 is integrally formed. However, the fireproof coating structure 10 can also be applied to the boundary between the RC boxes 3 in which the SC box 5 is replaced with the RC box 3. In this case, only the surface of the cover 11 on the inner space 100 side has a fireproof coating layer. 17 should be provided.

Further, the end portion 11b of the cover 11 has a long hole 118 along the tunnel axis direction, and is attached to the inner air surface of the RC box 3 using an anchor member 113 passed through the long hole 118 . As a result, while preventing the end portion 11b of the cover 11 from coming off the RC box 3, the anchor member 113 slides in the long hole 118 when the RC box 3 and the SC box 5 are relatively displaced, thereby preventing the relative displacement. no hindrance.

Further, a cover 11e that covers the long hole 118 is provided on the inner space 100 side of the end portion 11b of the cover 11, and is protected from the fireproof coating layer 17. Layer 17 does not interfere.

Further, since the gap 12 is provided between the end portion 11b of the cover 11 and the RC box body 3, the end portion 11b of the cover 11 can be smoothly moved with respect to the inner air surface of the RC box body 3. Further, by providing the water stop material 13 in the gap 12, water leakage to the inner space 100 can be prevented.

However, the present invention is not limited to this. For example, in this embodiment, an example of a box constituting the tunnel 1 is explained, but the fireproof covering structure 10 of this embodiment can also be applied to a box constituting other structures.

Further, in the fireproof covering structure 10, the elongated hole 118 is provided in the end portion 11b of the cover 11, but instead of the elongated hole 118, a hole of another shape may be provided. In any case, it is sufficient that the anchor member 113 passed through the hole can prevent the end portion 11b from falling off and the anchor member 113 can relatively move within the hole when the boxes are relatively displaced.

Further, if the end portion 11b of the cover 11 can move along the inner air surface of the RC box 3, the gap 12 can be omitted.

In addition, it is also possible to provide a water stop material in the space 6 on the inner space 100 side of the joint material 9 to prevent water that has entered from the boundary between the SC box 5 and the RC box 3 from leaking into the inner space 100. is.

Although the preferred embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to such examples. It is obvious that a person skilled in the art can conceive of various modifications or modifications within the scope of the technical ideas disclosed in the present application, and these naturally belong to the technical scope of the present invention. Understood.

1: Tunnel 2: Ground 3: RC box 5: SC box 6: Space 9: Joint material 10: Fireproof coating structure 11: Covers 11a, 11b: Ends 11c: Intermediate part 11d: Folded part 11e: Cover 12: Gap 13: Water stop material 17: Fireproof coating layers 31, 52: Concrete 51: Steel shell 100: Inner space 112: Fixing member 113: Anchor members 114a, 114b: Nut 114c: Washer plate 118: Long hole 119: Hole

Claims (5)

A fireproof covering structure provided at a boundary having a flexible joint between a first box body and a second box body,
a cover provided on the inner hollow side of the first and second boxes so as to straddle the boundary;
a fireproof coating layer provided on the inner space side surface of the cover;
and
One end of the cover is fixed to the first box,
The other end of the cover is arranged on the inner hollow side of the second box so as to be movable with respect to the second box,
a portion of the cover corresponding to the boundary portion has a concave portion recessed toward the inner hollow side;
The refractory coating layer is formed by mortar ,
A fireproof covering structure, wherein no water stoppage is provided between the boundary portion and the recess of the cover, and water that has entered from the boundary portion into the inner space is drained through the recess. The first box is formed by filling concrete in a steel shell,
The second box is made of concrete,
2. The fireproof coating structure according to claim 1, wherein the fireproof coating layer is provided on the inner space side surface of the cover continuously from the inner space side surface of the first box body. The other end has a long hole along the direction in which the first and second boxes are arranged,
3. The refractory according to claim 1, wherein the other end is attached to the inner hollow side surface of the second box using an anchor member passed through the long hole. covering structure. 4. The fireproof covering structure according to claim 3, wherein the cover has a covering on the inner hollow side of the other end to cover the elongated hole. A gap is provided between the other end of the cover and the inner hollow side surface of the second box,
5. The fireproof covering structure according to any one of claims 1 to 4, wherein a water stop material is arranged in said gap.

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