JP2011252352A - Construction method of tunnel lining structure and tunnel lining structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a construction method of a tunnel lining structure capable of easily and inexpensively constructing the tunnel lining structure with fire resistance/heat resistance, and the tunnel lining structure.SOLUTION: The construction method of the tunnel lining structure includes a step of forming a segment ring by combining a plurality of segment members 1 while lifting the segment members 1 using grout holes 2 formed in the segment members 1, a step of inserting a bag member 3 into the grout holes 2, and a step of injecting hardening material 4 into the bag member 3 so as to let the bag member 3 to be in close contact with the internal peripheral surface of the grout holes 2, and the tunnel lining structure is constructed using the method thereof.

Description

  The present invention relates to a method for constructing a tunnel lining structure having a simple shielding lid for grout holes and a tunnel lining structure.

  When a grout hole is formed in the segment member constituting the tunnel lining structure as a jig mounting portion for injection or assembly of backfill material, it is common to shield the grout hole with a lid member. .

  It is desirable that such a lid member has a water-stopping property so that groundwater, earth and sand, etc. do not flow into the tunnel from the grout hole (for example, see Patent Document 1).

  On the other hand, attention is paid to the fire resistance and heat resistance of a tunnel in preparation for a fire in the tunnel. As a tunnel lining structure having such fire resistance and heat resistance, many tunnel lining structures have been developed to give the segment members themselves fire resistance and heat resistance, and have been put into practical use.

However, even if the segment member has fire resistance and fire resistance, if the lid member does not have fire resistance and heat resistance, the lid member may expand during a fire or the like, which may adversely affect the segment member. .
Therefore, what was comprised with ceramics etc. is disclosed as a cover member provided with fire resistance (for example, refer patent document 2).

Japanese Patent Laid-Open No. 9-268885 JP 2007-327174 A

  However, since the conventional lid member having fire resistance and heat resistance is almost entirely composed of expensive ceramics, the cost is high. In addition, a lid member made of ceramics or the like needs to be precisely processed at the time of manufacture, which requires labor. For this reason, a large number of lid members that need to be arranged in the tunnel have been one of the causes of the high construction cost of the tunnel.

  The present invention aims to solve the above-mentioned problems, and a tunnel lining structure construction method capable of easily and inexpensively constructing a tunnel lining structure having fire resistance and heat resistance, and The problem is to propose a tunnel lining structure.

  In order to solve the above-mentioned problem, the invention according to claim 1 is a process of forming a segment ring by combining a plurality of the segment members while lifting the segment member using a grout hole formed in the segment member. And a step of inserting a bag member into the grout hole, and a step of injecting a solidified material that has not yet solidified into the bag member to bring the bag member into close contact with the inner peripheral surface of the grout hole. Is the method.

  The invention according to claim 2 includes a step of forming a segment ring by combining a plurality of the segment members while lifting the segment member using a grout hole formed in the segment member, and a solidification that has not yet solidified. Inserting the bag member into which the material is injected into the grout hole before the solidified material is cured, and closely contacting the bag member to the inner peripheral surface of the grout hole. .

According to the construction method of the tunnel lining structure, since the bag member into which the solidifying material is injected is used as a cover material for shielding the grout hole, a tunnel lining structure having fire resistance and heat resistance can be easily constructed. can do.
In the unlikely event that the cover material deteriorates due to a fire or the like, after removing the deteriorated cover material, it is possible to shield the grout hole using a new cover material. Furthermore, since relatively inexpensive materials are used, the overall construction cost can be reduced.

  The invention according to claim 3 is a tunnel lining structure formed by combining a plurality of segment members in the circumferential direction of the tunnel, wherein a grout hole is formed in the segment member, and inside the grout hole A bag member is disposed, a solidifying material is injected into the bag member, and the outer peripheral surface of the bag member is in close contact with the inner peripheral surface of the grout hole, thereby shielding the grout hole. It is characterized by having.

In such a tunnel lining structure, the grout hole is shielded by the bag member into which the solidifying material is injected, so that there is no possibility of adversely affecting the segment member even in the event of a fire.
Further, even when the bag member or the solidified material is deteriorated due to a fire or the like, removal and restoration can be easily performed.

  In the tunnel lining structure, if a locking recess is formed on the inner peripheral surface of the grout hole, the solidified material that has not yet solidified flows into the locking recess, and the solidified material is filled in the locking recess. Since it hardens | cures, a latching recessed part and the solidified material (hardened | cured material) which were solidified engage, and coming out is prevented.

  If a cement-based solidifying material such as a mortar that hardly expands at high temperatures or a fiber-reinforced mortar, for example, a mortar containing polypropylene, is used as the solidifying material, the influence on the segment member is reduced. Mortars and fiber reinforced mortars are economical because they can be obtained at a relatively low cost compared to ceramic lid members. The solidifying material is not limited to a cement-based material, as long as it is a material that closes the grout hole and prevents heat from flowing into the tunnel from the surrounding ground.

In addition, if the bag member is in close contact with the inner peripheral surface of the grout hole in the range of a depth of 60 mm or more from the inner air side surface of the segment member toward the natural mountain side, a fire resistance of 60 mm or more is secured. Therefore, it is possible to ensure sufficient fire safety.
Here, it is possible to give fire resistance performance to the segment by securing a fire resistance of 60 mm, as described in literature (for example, Akiaki Kawamura, Kenichi Nakatsu, Yoichi Sano, “Development of fireproof segment (2 ) -Results of full-scale heating test- ", 62nd annual academic lecture of Japan Society of Civil Engineers).

  According to the tunnel lining structure construction method and tunnel lining structure of the present invention, a tunnel lining structure having fire resistance and heat resistance can be constructed easily and inexpensively.

It is a perspective view showing typically the tunnel lining structure concerning this embodiment. (A)-(c) is sectional drawing which shows the procedure of the construction method of the tunnel lining structure which concerns on 1st Embodiment. (A)-(c) is sectional drawing which shows the modification of a tunnel lining structure. (A)-(c) is sectional drawing which shows the procedure of the construction method of the tunnel lining structure which concerns on 2nd Embodiment.

<First Embodiment>
A first embodiment of the present invention will be described with reference to the drawings.
The tunnel lining structure of this embodiment is formed by combining a plurality of segment members 1 in the tunnel circumferential direction.

As shown in FIG. 1, a grout hole 2 is formed in the segment member 1, and a bag member 3 is disposed inside the grout hole 2. Further, a solidifying material 4 is injected into the bag member 3.
In addition, in this specification, the injection hole for filling grout on the back surface of the segment ring, the female screw hole that functions as a grip portion when assembling the segment members 1 and the like are collectively referred to as a grout hole 2.

The segment member 1 has fire resistance and heat resistance.
As shown in FIG. 2A, the segment member 1 is formed with a refractory layer 11 made of polypropylene fiber mortar (hereinafter referred to as “PP mortar”) on the inner surface. The refractory layer 11 has a thickness of at least 60 mm.

  In addition, if the depth (injection thickness) of a solidification material is ensured as 60 mm or more as the fireproof layer 11, sufficient fireproof safety can be ensured.

  In the present embodiment, the general layer 12 other than the refractory layer 11 of the segment member 1 is made of reinforced concrete. However, the material forming the general layer 12 is not limited, and may be formed by selecting an appropriate material. That's fine.

As shown in FIG. 1, the grout hole 2 is formed in the central portion (center of gravity position) of the segment member 1.
In this embodiment, the grout hole 2 that is a through hole is formed in the segment member 1, but when it is used only at the time of segment assembly, such as when it is not necessary to perform backfill injection, the grout hole 2 is It may be bottomed (see FIG. 3 (a)).

  On the inner peripheral surface of the grout hole 2, as shown in FIG. 2A, an internal thread 21 is processed and a locking recess 22 is formed.

In the present embodiment, the female screw 21 is formed on the ground mountain side, and the locking recess 22 is formed on the inner space side of the female screw 21. In this embodiment, it forms so that the boundary part of the internal thread 21 and the latching recessed part 22 may be arrange | positioned along the boundary of the fireproof layer 11 and the general layer 12. FIG.
The positions where the female screw 21 and the locking recess 22 are formed are not limited.

  The female screw 21 of the present embodiment is formed by arranging a cylindrical member whose inner peripheral surface is processed with a female screw on the ground mountain G side of the grout hole 2. In addition, the formation method of the internal thread 21 is not limited. The material of the cylindrical member forming the female screw 21 is not limited, but a material such as metal or ceramic that has a strength that does not break when the jig is attached or detached is desirable.

The locking recess 22 is a semicircular groove in cross-sectional view, and is formed in an annular shape by expanding a part of the grout hole 2.
The shape of the locking recess 22 is not limited, and may be, for example, a triangular shape in cross section as shown in FIG. 3B, or a rectangular shape in cross section as shown in FIG. It may be. Further, the locking recess 22 is not necessarily formed in an annular shape, and a plurality of locking recesses 22 may be formed at intervals along the circumferential direction of the grout hole 2. Further, the locking recess 22 may be formed in a plurality of stages.

  As shown in FIG. 2C, the bag member 3 shields the grout hole 2 because its outer peripheral surface is in close contact with the inner peripheral surface of the grout hole 2.

The bag member 3 is a polypropylene bag.
Although the thickness of the bag which comprises the bag member 3 is not limited, Preferably the thing in the range of 0.01-0.1 mm should just be used. In the present embodiment, a bag member 32 having a thickness of about 0.02 mm is used.
In the present embodiment, an elastic member is employed as the bag member 3, but the bag member 3 may be formed of an inelastic body. Moreover, the material which comprises the bag member 3 is not limited to a polypropylene, For example, a polypropylene rubber may be sufficient.

  As shown in FIG. 2C, the bag member 3 expands when the solidifying material 4 is injected therein. The outer peripheral surface of the expanded bag member 3 is in close contact with the inner peripheral surface of the grout hole 2 (the inner peripheral surface of the locking recess 22). Furthermore, the bag member 3 is inserted to a depth at which the tip thereof reaches the general layer 12 (internal thread 21).

  The solidifying material 4 is a cement-based material injected into the bag member 3. As the solidifying material 4 is cured, a cured body 41 is formed inside the bag member 3.

  In this embodiment, a mortar containing polypropylene fibers is adopted as a material constituting the solidifying material 4, but the material constituting the solidifying material 4 is not limited as long as it is a refractory material. A material that does not risk explosion is desirable. For example, other fiber reinforced mortar, mortar, high-strength mortar, fiber reinforced concrete or so-called refractory concrete coarse aggregate may be employed. In addition, the fiber used in fiber reinforced mortar or fiber reinforced concrete is not limited, for example, various fibers such as steel fiber, polypropylene fiber, polyethylene fiber, carbon fiber, aramid fiber, or vinylon fiber, or these fibers What is necessary is just to use what combined several fiber suitably from the fibers.

The cured body 41 is formed to have a length larger than the thickness of the refractory layer 11 (length of 60 mm or more with respect to the thickness direction of the segment member 1).
The cured body 41 is in close contact with the inner surface of the grout hole 2 via the bag member 3 as shown in FIG. The hardened body 41 is formed with a locking projection 42 that engages with the locking recess 22.

  Next, a method for constructing a tunnel lining structure according to the first embodiment will be described. The construction method of the present embodiment includes a ring forming step, a bag member arranging step, and a filling step.

A ring formation process is a process of combining a plurality of segment members 1 and forming a segment ring.
The assembly of the segment ring is performed by attaching a jig (not shown) to the grout hole 2 and connecting the segment members 1 to each other in a state where the segment member 1 is lifted through the jig.

  After the formation of the segment ring, backfill injection is performed from the grout hole 2 to the back surface of the segment ring (segment member 1) as necessary.

  The bag member arranging step is a step of inserting the bag member 3 into the grout hole 2 as shown in FIG.

  The filling step is a step of bringing the bag member 3 into close contact with the inner peripheral surface of the grout hole 2 by filling the bag member 3 with the solidifying material 4 and curing as shown in FIGS.

By injecting the solidifying material 4, the bag member 3 expands in a columnar shape as shown in FIG.
The bag member 3 expands in the thickness direction of the segment member 1 and the direction perpendicular to the thickness direction, so that the outer peripheral surface is in close contact with the inner peripheral surface of the grout hole 2 and the tip is a general layer 12 (female). Arranged on the screw 21). Further, the bag member 3 is in close contact with the inner peripheral surface of the grout hole 2 in a state where a part of the bag member 3 enters the locking recess 22.

  When the solidifying material 4 is injected, the mouth of the bag member is shielded as shown in FIG. In addition, although the shielding method of the opening | mouth of the bag member 3 is not limited, in this embodiment, it shields with the clip-shaped fastener 31. FIG.

  By curing the solidifying material 4 filled in the bag member 3, as shown in FIG. 3 (c), a cured body 41 having a locking projection 42 is formed.

As described above, according to the tunnel lining structure of the present embodiment, the segment member 1 and the cured body 41 ensure the fireproof layer 11 (fire resistance) having a thickness of 60 mm or more, so that the tunnel has excellent fire resistance and fire resistance. A lining structure S is formed.
That is, it is possible to prevent the occurrence of enormous damage due to the sudden rise in temperature assumed when a fire occurs in the tunnel.

Since the cured body 41 is composed of PP-containing mortar, it has excellent fire resistance and fire resistance, and also has sufficient strength as a part of the tunnel lining structure S. Therefore, the segment member 1 is prevented from being affected by breakage even when the temperature rises suddenly when a fire occurs in the tunnel.
It is inexpensive because it uses a relatively inexpensive cementitious material.

Since the locking projection 42 is engaged with the locking recess 22, the cured body 41 does not come out.
Moreover, when the bag member 3 deteriorates due to a fire or the like, it can be easily removed by crushing the cured body 41 with a drill hammer or the like. After removing the cured body 41, it can be easily restored by the method described above.

  Since the bag member 3 is made of polypropylene, no heat is transferred through the bag member 3 even if a fire occurs in the tunnel. Further, even if the bag member 3 is melted by a fire, since the bag member 3 is thin, heat is prevented from being transmitted by the cured body 41 filled in the bag member 3 (grout hole 2). The For this reason, the segment member 1 is not adversely affected by the heat transfer from the grout hole 2.

  Since the bag member 3 is inserted into the grout hole 2 and the operation of shielding the grout hole 2 is completed simply by injecting the solidifying material 4 into the bag member 3, the workability is excellent. Moreover, it is economical because it is composed of only relatively inexpensive materials.

<Second Embodiment>
The tunnel lining structure of the second embodiment of the present invention is formed by combining a plurality of segment members 1 in the tunnel circumferential direction, similarly to the tunnel lining structure shown in the first embodiment. .

A grout hole 2 is formed in the segment member 1 as shown in FIG. 4C, and a bag member 3 is disposed inside the grout hole 2. Further, a solidifying material 4 is injected into the bag member 3.
In addition, since the structure of each member which comprises the tunnel lining structure which concerns on 2nd Embodiment is the same as the structure shown in 1st Embodiment, detailed description is abbreviate | omitted.

  Next, a method for constructing a tunnel lining structure according to the second embodiment will be described. The construction method of the present embodiment includes a ring formation step, an injection step, and a bag member placement step.

  A ring formation process is a process of combining a plurality of segment members 1 and forming a segment ring. The details of the ring forming step are the same as the contents shown in the first embodiment, and thus detailed description thereof is omitted.

The injection step is a step of injecting the solidifying material 4 into the bag member 3 before being inserted into the grout hole 2 as shown in FIG.
The bag member 3 expands in a cylindrical shape when the solidifying material 4 is injected.

  When the solidifying material 4 is injected, the mouth of the bag member is shielded. In addition, although the shielding method of the opening | mouth of the bag member 3 is not limited, in this embodiment, it shields with the clip-shaped fastener 31. FIG.

  A bag member arrangement | positioning process is a process of inserting the bag member 3 in which the solidification material 4 was inject | poured into the grout hole 2, before the solidification material 4 hardens | cures, as shown in FIG.4 (b).

As shown in FIG. 4C, the bag member 3 is inserted until the rear end surface of the bag member 3 substantially matches the inner surface of the segment member 1. Thereby, while the outer peripheral surface of the bag member 3 closely_contact | adheres to the inner peripheral surface of the grout hole 2, a front-end | tip part is arrange | positioned at the general layer 12 (female screw 21).
At this time, the bag member 3 is inserted so that the mouth side to which the fastener 31 is fixed is the ground mountain G side, so that no protrusion is formed on the inner space side of the tunnel.

When the bag member 3 is pushed into the grout hole 2, the front end side (natural ground side) of the bag member 3, which is an elastic body, extends and comes into close contact with the inner surface of the grout hole 2. On the other hand, the rear end side (empty side of the tunnel) of the bag member 3 contracts as the solidified material 4 flows toward the front end side. In addition, the bag member 3 of this embodiment is formed so that the wall thickness on the front end side (mouth side) is thicker than the rear end side so that it can withstand expansion when pushed into the grout hole 2.
The bag member 3 is in close contact with the inner peripheral surface of the grout hole 2 in a state where part of the bag member 3 enters the locking recess 22.

  After the bag member 3 is inserted into the grout hole 2, the solidifying material 4 is cured. When the solidifying material 4 is cured, a cured body 41 including the locking projections 42 is formed.

  According to the method for constructing a tunnel lining structure according to the second embodiment, it is possible to construct a tunnel lining structure similar to the tunnel lining structure shown in the first embodiment.

The preferred embodiments of the present invention have been described above. However, the present invention is not limited to the above-described embodiments, and the above-described constituent elements can be appropriately changed without departing from the spirit of the present invention.
For example, the amount of the reinforcing fiber mixed into the PP-containing mortar (fiber reinforced mortar) constituting the solidifying material 4 is not limited, and may be set as appropriate, for example, the same level as the fiber reinforced concrete constituting the segment member 1. do it.

As shown to Fig.3 (a), the fireproof board | plate material 5 may be arrange | positioned in the inner-space side surface of the grout hole 2, and a tunnel inner peripheral surface may be finished smoothly. In the case where the plate material 5 is disposed outside the fireproof layer 11 (inside of the tunnel), that is, when the plate material 5 is not included in the layer thickness of the fireproof layer 11, the plate material 5 may not be fireproof. .
Alternatively, the bag member 3 may be inserted into the grout hole 2 up to the rear end portion, and the inside of the bag member 3 may be filled with a filler or the like to finish the tunnel inner surface (the surface of the segment member) flat. Good.

In each of the above embodiments, the locking recess 22 is formed in the grout hole 2, but the recess formed by the female screw 21 may function as the locking recess 22.
In other words, the hardened body 41 (bag member 3) may be brought into close contact with the concave portion of the female screw 21 to engage with each other so as to be engaged.

The position of the grout hole 2 is not limited to the central portion of the segment member 1.
The grout hole 2 has a tapered diameter at the surface layer portion on the air side inside the tunnel, so that it is easy to attach a jig at the time of grout injection and to attach the lid member 3 or the like to the suspension member 2. You may comprise.

DESCRIPTION OF SYMBOLS 1 Segment member 11 Refractory layer 2 Grout hole 21 Female screw 22 Locking recessed part 3 Bag member 4 Solidification material 41 Hardened body G Ground mountain

Claims (5)

A step of forming a segment ring by combining a plurality of the segment members while lifting the segment member using a grout hole formed in the segment member;
Inserting a bag member into the grout hole;
And a step of injecting a solidifying material into the bag member to bring the bag member into close contact with an inner peripheral surface of a grout hole. A step of forming a segment ring by combining a plurality of the segment members while lifting the segment member using a grout hole formed in the segment member;
A step of inserting the bag member into which the solidifying material has been injected into the grout hole before the solidifying material is cured, and closely attaching the bag member to the inner peripheral surface of the grout hole. How to build a lining structure. A tunnel lining structure formed by combining a plurality of segment members in the tunnel circumferential direction,
Grout holes are formed in the segment members,
A bag member is disposed inside the grout hole,
A solidifying material is injected into the bag member,
A tunnel lining structure characterized in that an outer peripheral surface of the bag member is in close contact with an inner peripheral surface of the grout hole, thereby shielding the grout hole.   The tunnel lining structure according to claim 3, wherein a locking recess is formed on an inner peripheral surface of the grout hole.   The said bag member is closely_contact | adhered to the internal peripheral surface of the said grout hole in the range of the depth of 60 mm or more toward the natural mountain side from the inner-space side surface of the said segment member, The tunnel lining structure according to claim 4.

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