JPH09177493A - Method for lining tunnel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase the efficiency of construction work by temporarily assembling together a plurality of lining members into a ring shape for formation of a lining ring, enlarging the diameter of the lining ring to attach each lining member to the natural ground of a tunnel, and filling the joints of the lining members that adjoin to one another in the circumferential direction of the cover ring with a filler. SOLUTION: A plurality of lining members 2 are temporarily assembled into a ring shape inside the tail A of a tunnel excavator to form a ring (a). Next, the lining ring (a) is pushed out of the inside A of the tail of the tunnel excavator into a tunnel 1. Then a widening jack 6 is driven in its expanding direction to widen the lining ring (a) outwards to attach each lining member 2 to the natural ground of the tunnel 1. Then spaces (b) formed by driving of the widening jack 6 are filled with a filler 8. These processes are performed alternately with tunnel excavation to construct the overall length of the tunnel using the lining members 2. Thus the inner periphery of the inside of the tunnel can be lined efficiently and safely.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tunnel lining method capable of efficiently and safely lining a tunnel.

[0002]

2. Description of the Related Art Generally, tunnels constructed as headraces in mountainous areas and tunnels such as subways in central Tokyo are excavated by automated tunnel excavators such as tunnel boring machines and shield machines. The inner circumference of the tunnel is lined with cast-in-place concrete (see Figure 5 (a)) or segment (see Figure 5 (b)).

[0003]

However, according to the method of lining with cast-in-place concrete, a plurality of supporting members 9 made of H-shaped steel or grooved steel are attached to the ground 10 in the longitudinal direction of the tunnel. It is a method of building at a predetermined interval, spraying sprayed concrete 11 on it at a predetermined thickness, then assembling a formwork 12 inside it, and placing concrete 13 in this formwork 12. However, since most of the work is done manually, there was a problem that construction efficiency was extremely poor. In addition, most of the work is done in a bare area where the lining is not covered, which poses a problem that there is a risk that the ground may fall off, which may pose a danger.

On the other hand, in the lining method using segments, the ring-shaped segment ring 14 assembled in the tail of the tunnel excavator is installed by connecting it to the already installed existing segment ring with fastening bolts, etc. Although this is a method of filling the back filling material 15 on the back side, there is a problem that the amount of earthwork is increased because the excavated cross section of the tunnel needs to be large in order to secure a working space. Further, there is a problem that not only the backfilling material 15 needs to be filled, but also a joint metal fitting such as a fastening bolt for connecting the segments 14 becomes large-scaled.

Further, the segment ring requires at least three types of segments, a segment installed at the bottom, side segments installed on both sides of this segment, and a key segment installed at the upper end of the segment ring. Therefore, there is a problem that the number of types of segments having different sizes and shapes is increased and the management of the segments tends to be complicated.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a tunnel lining method capable of improving the efficiency of construction and improving the safety of construction.

[0007]

According to a first aspect of the present invention, there is provided a lining method for a tunnel, wherein a plurality of lining members are provided on the inner circumference of the tunnel excavated by a tunnel machine. In the lining method of the tunnel, in which the inner circumference of the tunnel is lined by sequentially installing in the circumferential direction and the longitudinal direction,
A lining ring is constructed by temporarily assembling a plurality of lining members into a ring shape, and the diameter of the lining ring is expanded to attach each of the lining members to the ground of the tunnel. It is characterized in that the joint portion of the lining member adjacent in the circumferential direction of the lining ring is filled with the filler.

In the tunnel lining method according to the second aspect of the present invention, in the preceding paragraph, a plurality of lining members are temporarily assembled in a ring shape in the tail of the tunnel excavator, and the lining ring is It is characterized by being pushed into the tunnel.

According to a third aspect of the present invention, in the tunnel lining method according to the first aspect, the lining ring is constructed by temporarily assembling a plurality of lining members in a ring shape in the tunnel. Characterize.

According to a fourth aspect of the present invention, there is provided a lining member according to the first aspect, the second aspect, or the third aspect, wherein the lining ring is expanded outward by expanding the lining ring. Each is attached to the ground of the tunnel.

According to a fifth aspect of the present invention, there is provided a method of lining a tunnel according to the first aspect, the second aspect or the third aspect, wherein the lining ring is slid in the circumferential direction to expand the diameter of the lining. The feature is that each member is attached to the ground of the tunnel.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION

First Embodiment of the Invention 1 to 3 show an embodiment of the present invention. In the drawings, reference numeral 1 is a tunnel which is being dug by a tunnel boring machine such as a tunnel boring or shield machine, and 2 is a tunnel 1 inside the tunnel 1. A lining member, which is sequentially installed in the circumferential direction and in the longitudinal direction of the tunnel and forms a lining ring a to lining the inner circumference of the tunnel 1, and 3 is a connecting portion between the lining members 2 forming the lining ring a. Temporary metal fittings 4, which are attached and temporarily assemble the lining members 2 adjacent to each other in the circumferential direction of the tunnel 1, pass through the temporary metal fittings 3 and are respectively screwed into the inserts 5 embedded in the lining member 2. Then, the temporary assembly fitting 3 is attached to the lining member 2
The temporary assembly bolts 6 to be temporarily fixed to are attached to the connecting portion of the lining members 2 located at the lower end of the lining ring a,
Each of the lining members 2 is grounded by sliding the lining ring a in the circumferential direction of the tunnel 1 or by expanding the lining ring a to the outside (ground side) of the lining ring a. Widening jack attached to the mountain, 7 is the lining ring a
Is a guide member that is attached to a connecting portion between the lining members 2 located at the upper end of the lining member and serves as a guide when sliding the lining member 2 in the circumferential direction of the tunnel 1, and reference numeral 8 indicates the lining ring a. Lining member formed by expanding the diameter
It is a filler that fills the gap b between the spaces 2 and 2 and fills the gap b.

The lining member 2 is formed of concrete, steel, cast steel or the like, and is formed into an arc shape having a predetermined curvature so as to be attached to the ground of the tunnel 1, and is made of concrete. For example, it is molded from high-strength concrete in order to reduce weight and improve strength, and is further molded in a factory for mass production and quality improvement.

Further, the joint portion in the circumferential direction of the lining member 2 does not require a joint metal fitting such as a fastening bolt in particular, and furthermore, the protrusions are engaged with each other so that they can freely rotate in a joined state. 2a and 2b are formed continuously in the width direction (FIGS. 2 (a) and 2 (b)), and the lining member 2
If necessary, the lining member 2 may be attached to the joint portion in the width direction of the
In some cases, a convex portion and a concave portion (not shown) that are engaged with each other may be formed so that they contact each other without shifting.

The temporary assembly metal fitting 3 and the temporary assembly bolt 4 are repeatedly used, and the widening jack 6 is, for example, a hydraulic type jack.

The guide member 7 is formed of a steel plate into a rectangular plate shape, and has the same curvature as the lining member 2 so as to be attached to the outer side of the lining member 2. further,
It is attached to the outer side of the lining member 2 so as to be slidable in the circumferential direction of the tunnel 1. Non-shrinkable concrete or the like is used as the filler 8.

Next, a method of lining a tunnel in such a structure will be described step by step (FIGS. 3 (a), (b), (c), (d)).
reference).

First, in the tail A of the tunnel machine
Then, a plurality of lining members 2 are temporarily assembled in a ring shape to form a lining ring a.

In this case, in the inside A of the tail of the tunnel machine, a plurality of lining members 2 are installed in a ring shape along the circumferential direction with the inner wall of the tail as a guide surface, and the lining ring a A guide member 7 is attached to the joint between the lining members 2 located at the upper end, and the widening jack 6 is set at the joint between the lining members 2 located at the lower end of the lining ring a. If necessary, the lining ring a is reinforced by a temporary holder (not shown) capable of holding the circular shape of the lining ring a. Further, the widening jack 6 is driven to bring the joint portions of the lining member 2 into close contact with each other without forming a gap. Further, the adjacent lining members 2 are temporarily fixed by the temporary assembling metal fitting 3 and the temporary assembling bolt 4 so as not to collapse.

The guide member 7 is fixed by welding one end to one outer surface of the adjacent covering member 2 and the other end is simply attached to the outer surface of the other covering member 2 and set. .

Next, the lining ring a is extruded into the tunnel 1 from the inside A of the tail of the tunnel machine. In this case, by pushing the lining ring a into the tunnel 1 and advancing the tunnel excavator simultaneously,
The natural grounds are always covered with the skin plate or the lining ring a of the tunnel machine to prevent the natural grounds from falling off. Further, the lining ring a pushed into the tunnel 1 is attached to the end surface of the lining ring a already installed in the tunnel 1.

The lining ring a may be pushed into the tunnel 1 from inside the tail A with the tunnel machine stopped.

Next, the widening jack 6 is driven in the extending direction to expand the diameter of the lining ring a to the outside (ground side), so that each of the lining members 2 is strongly attached to the ground of the tunnel 1. .

Next, a spacing member (not shown) made of a concrete block or the like is installed in the gap b formed by driving the widening jack 6, and the widening jack 6 is removed. Then, the gap b is filled with a filler 8 such as non-shrinkable concrete, and when the filler 8 exhibits sufficient strength, the temporary metal fitting 3 and the temporary bolt 4 are removed.

When the lining member 2 is installed as a lining member when constructing a temporary shaft or the like for excavating a main tunnel, the lining member 2 should be taken into consideration after removal. There is no particular connection between the lining members 2, but in the case where they are installed as lining members for a permanent tunnel, the lining members 2 are connected in principle.

Further, the guide member 7 is not particularly required as long as the joint portion of the lining member 2 is configured to be rotatable, but it is preferable to install the guide member 7 in order to prevent the natural skin from falling off. Further, the spacing material is embedded in the filling material 8.

The following steps (1) to (5) are alternately performed with the tunnel excavation to construct the entire length of the tunnel with the lining member 2. Since the lining rings a are in close contact with each other in the longitudinal direction of the tunnel and are continuously installed, a tunnel lining body having extremely high rigidity can be formed. Therefore, the lining ring a can also be used as a reaction force receiver when the tunnel machine is propelled.

Embodiment 2 of the Invention 4 (a), (b), (c)
Shows another embodiment of the present invention, and the construction method will be described below step by step.

First, in the tunnel 1, a plurality of lining members 2 are temporarily assembled in a ring shape to form a lining ring a.

In this case, this tunnel 1
A plurality of lining members 2 are installed in a ring shape along the circumferential direction with the natural ground surface of the lining member as a guide surface, and at the joint portion between the lining members 2 located at the upper end of the lining ring a. The guide member 7 is attached, and the widening jack 6 is set at the joint portion between the lining members 2 located at the lower end of the lining ring a. Further, the adjacent lining members 2 are temporarily fixed by the temporary assembling metal fitting 3 and the temporary assembling bolt 4 so as not to collapse.

In this case, a gap is formed in the joint portion between the lining members 2 located at the upper end of the lining ring a.
Since the guide member 7 is attached, it is possible to prevent the natural skin from falling off, thus ensuring the safety of construction.

Next, the widening jack 6 is driven in the extending direction to slide the lining ring a in the circumferential direction along the ground of the tunnel 1 to strongly attach each of the lining members 2 to the ground. wear.

Next, the widening jack 6 is removed by using a gap holding material (not shown) in the gap b formed by expanding the diameter of the lining ring a. Then, the filler 8 is placed in the gap b.
When the filling material 8 exhibits sufficient strength, the widening jack 6 is removed, and then the temporary assembly metal fitting 3 and the temporary assembly bolt 4 are removed. Other configurations and steps are the same as those in the above method.

[0034]

The tunnel lining method according to the present invention has the above-described structure, and temporarily assembles a plurality of lining members in a ring shape in the tail of the tunnel machine or in the tunnel to form the lining ring. A lining ring, and each of the lining members is attached to the ground of the tunnel by expanding the diameter of the lining ring, and then to the joint portion of the lining members adjacent in the circumferential direction of the lining ring. Since the filling material is filled, there is an effect that the inner circumference of the tunnel can be lined extremely efficiently and safely.

Further, the lining ring is slid in the circumferential direction of the tunnel by a widening jack, or is simply expanded to the outside of the lining ring (the natural ground side) to expand the diameter of the lining member. Since it is attached to the ground, the lining member can be easily and surely set in a state in which it is closely attached to the ground of the tunnel, and there is an effect that construction reliability can be achieved.

Further, since the circumferential joint portion of the lining ring is filled with a filler such as non-shrink concrete instead of the key segment, the gap formed by expanding the diameter of the lining ring is filled. Not only is it possible to deal with variations in the diameter of the lining ring, but it is also possible to use only one type of basic segment, which is effective in managing the segment.

[Brief description of the drawings]

FIG. 1 (a) is a cross-sectional view of a tunnel lined with a lining member, (b) is a side view thereof, and (c) is an enlargement of a lining member joint located at the upper end of the lining ring. It is a figure.

2A is a side view of a lining member, and FIG. 2B is a plan view thereof.

[Fig. 3] (a) is a vertical sectional view of the tunnel under construction, (b) is a transverse sectional view of the tunnel showing a state where the lining ring is extruded into the tunnel, and (c) is a diameter expansion of the lining ring. FIG. 3D is a cross-sectional view of the tunnel showing a state in which the lining ring is expanded, and FIG.

[Fig. 4] (a) is a vertical cross-sectional view of the tunnel under construction, (b) is a horizontal cross-sectional view of the tunnel showing a state in which the lining ring is assembled in the tunnel, and (c) is a diameter expansion of the lining ring. It is a cross-sectional view of the tunnel showing the state.

FIG. 5 shows an example of a conventional tunnel lining method, (a)
Both (b) and (b) are cross-sectional views thereof.

[Explanation of symbols]

1 ... Tunnel, 2 ... Lining member, 3 ... Temporary assembly metal fitting, 4 ... Temporary assembly bolt, 5 ... Insert, 6 ... Widening jack, 7 ...
Guide member, 8 ... Filler material, a ... Lining ring.

Claims (5)

[Claims] 1. A tunnel for lining the inner circumference of a tunnel, wherein a plurality of lining members are sequentially installed along the circumferential direction and the longitudinal direction of the tunnel, which are dug by a tunnel excavator. In the lining method, a plurality of lining members are temporarily assembled into a ring shape to form a lining ring, and the diameter of the lining ring is expanded to attach each of the lining members to the ground of the tunnel. Next, a tunnel lining method, characterized in that the joint portion of the lining member adjacent in the circumferential direction of the lining ring is filled with a filler. 2. The tunnel cover according to claim 1, wherein a plurality of lining members are temporarily assembled in a ring shape in the tail of the tunnel excavator and the lining ring is pushed out into the tunnel. Construction method. 3. The tunnel lining method according to claim 1, wherein a plurality of lining members are temporarily assembled into a ring shape in the tunnel to form a lining ring. 4. The lining member is attached to the natural ground of the tunnel by expanding the diameter of the lining ring by pushing and expanding the lining ring outwardly. The tunnel lining method according to item 3. 5. The lining member is attached to the ground of the tunnel by sliding the lining ring in the circumferential direction to expand the diameter of the lining member.
The method for lining a tunnel according to item 3 or item 3.