JPS5912839B2 - Tunnel filler lining construction method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for lining a tunnel with a filler material.

When constructing tunnels, RTM (RockTun
A tunnel shaft with a predetermined cross-sectional shape is excavated using various tunneling methods such as (heiling machine) method, blasting method, shield method, etc., and the ground is supported using steel arch supports or segments as support, and from the inside of this support. A permanent lining is formed by lining with a filler material such as concrete.

In addition, when segments are used as the shoring, the segment lining itself is often considered to be a permanent lining, but in this case, backfilling with filler is used between the segment lining and the ground. construction will be carried out.

Furthermore, while using segments as supporting materials, filling material is filled into the almost uniform gaps between the segment lining and the ground, and this hardened and bonded filler lining can be used as shoring or as a permanent covering. Construction methods have also been proposed.

The present invention proposes a filling material lining construction method that can quickly drain spring water from the ground to the outside of the tunnel when constructing such a tunnel filling material lining.

Hereinafter, as an example of the present invention, we will take as an example the case of tunnel construction in which the filler lining is used as shoring or permanent to permanent lining in the RTM construction method using segments as supporting materials, and the details will be explained based on the drawings. I will explain.

First, tunnel pit 1 is excavated into the ground 4 using PTM, and the PTM
When the face moves forward due to TM, the invert segment 5 is laid at the lower part of the tunnel behind it.

The invert segment 5 is made of concrete and serves as a support for a steel plate 6 to be described later and a segment 7 to be assembled as shoring and formwork, and also as a sleeper when a rail (not shown) is laid on the invert segment 5. It is a substitute for

When the invert segment 5 has been laid in this way, its level is adjusted and the lower part of the invert segment 5 is filled with concrete, thereby fixing the position of the invert segment 5.

Note that it is appropriate to use a wedge to adjust the level of the invert segment 50.

Next, the segments 7 are sequentially assembled into an arch shape on the upper side of the invert segment 5 from both sides using bolt joints 8, and closed near the apex to form the segment lining 9. In this case, the segments 7 are When assembling, a thin iron plate (such as a galvanized iron plate) 6 is placed outside the segment 7, and the iron plate 6 is brought into contact with the ground 4 by a support 10, which will be described later, and the iron plate 6 and the segment 7 are When the segment 7 is removed, the iron plate 6 is similarly assembled in an arch shape outside the segment 7.

In this way, the segments 7 and the steel plates 6 are sequentially assembled in the longitudinal direction of the tunnel to a length suitable for one time of pouring concrete lining, for example, about 20 m.

In addition, in order to prevent the cast lining concrete from flowing out between the invert segment 5 and the segment 7 connected thereto, the segment T is screwed to the invert segment 5 through a sealing material 12 as shown in Fig. 4. It's good to keep it.

A groove segment 13 having a width that spans the surface of the ground 4 and the periphery of the segment lining is placed on the side surface of the tip of the segment lining 9 formed to an appropriate length from the upper surface of both sides of the invert segment 5 as shown in FIG. The groove segment lining 14 is constructed by assembling the groove segment lining 14.

The groove segment lining 14 functions as a formwork for forming the groove 3, and also functions as a weir plate to prevent the filler cast in the gap 11 from flowing out to the front of the tunnel.

Therefore, it is desirable to interpose a sealing material between the groove segment 13 and the segment 7 as well.

Once the groove segment lining 14 has been assembled, the segment lining 9 is constructed in the same manner as described above, and once the face advances and there is no competition with the work on the face, fill the void 11 with hardening filler as soon as possible. After pouring concrete, or injecting non-hardening filler such as gravel, crushed stone, or waste, backfilling is performed by injecting cement milk or the like as a binder.

At this time, if there is spring water on the side of the ground 4, the water flows into the filling material side and prevents its hardening action or works to wash away part of the filling material. Since the iron plate 6 is installed, water flowing out from the ground 4 side flows through the void 11.
It flows down along the outer surface of the iron plate 6 without entering the inside.

On the other hand, in the invert segment 5, a drainage groove 15 is formed in the center of the upper surface along the longitudinal direction of the tunnel shaft 1, and a water intake hole 16 is bored in the lower surface along the vertical direction reaching the bottom surface of the drainage groove 15. Therefore, the flowing water moves from the water intake hole 16 to the drain groove 15, and is thereby quickly discharged outside the tunnel.

In this way, with the influence of water from the ground 4 side excluded, the backfilled filler is hardened and bonded to form the filler lining 2.

When this filler lining 2 has a predetermined strength as a shoring or a permanent lining, the supports 10 are embedded in the segments 7 and groove segments 13 as shown in FIGS. 2 and 3. The filler lining 2 supports the load of the earth 4.

In addition, since the filler lining 2 is separated from the ground 4 by the iron plate 6, there is a gap between the iron plate 6 and the ground 4 in order to improve the adhesion between the filler lining 2 and the ground 4. Cement milk may also be injected.

After removing the segments 7, the filler lining 2 can be used as a permanent lining, but if the load of the ground 4 is large, concrete can be placed inside it as a permanent lining. This concrete laying may be carried out, for example, after the filler lining 2 has been formed over the entire length of the tunnel, or it may be carried out sequentially while the segments 7 are being removed.

On the other hand, the removed segment 7 and the groove segment 13
are sequentially used in circulation to assemble the segment lining 9 and the groove segment lining 14 at the rear end of the RTM.

That is, in this embodiment, the segments 7 and the groove segments 13 are used as a lining formwork for the filler lining 2.

Since the filler lining 2 formed in this way is provided with circumferential grooves 3 reaching the surface of the ground 4 at appropriate lengths, the iron plate 6 may corrode over a long period of time. Even if the outer peripheral surface of the filler lining 2 is no longer smooth and it becomes difficult for spring water to flow down along this outer peripheral surface, the water will flow in the longitudinal direction of the tunnel and pass through the grooves 3 to the filler lining 2. Since it is guided inside, it can be discharged outside the tunnel.

Note that when the groove 3 is formed as in this embodiment, in the groove 3 portion, the filler lining 2, which is adjacent to each other as shown in FIG.
2 are preferably firmly connected by a connecting member 17 that spans the groove 3, and it is also preferable to roll interior concrete 2a inside the filler lining 2 and the connecting member 17.

In addition, when performing this interior concrete 2a or a permanent lining by concrete lining as described above, water intake holes corresponding to the grooves 3 are provided in the concrete 1 to guide it into the tunnel lining. Just leave it there.

Next, a specific example of the segment 7 and the support 10 will be described. As shown in FIG. 7, the segment 7 has a fastening hole 18 for fastening and assembling the segments, and
In order to insert and attach the support 10, the segment 7 has an appropriate number of recesses 19 recessed on the outer surface side and an insertion hole 20 bored in the center thereof, and back-filling is performed as appropriate. A hole 21 is bored.

Further, the support 10 has the recessed portion 19 as shown in FIG.
A nut member 22 that is fitted into the nut member 22, a pressing screw shaft 23 that is screwed into the nut member 22, a steel pipe (with concrete filled inside) 24 attached to the tip of the pressing screw shaft 23, and a contact member. It consists of 25.

Then, with a part of the pressing screw shaft 23 inserted into the insertion hole 20 from the outer surface side of the segment 7, the nut member 2 is inserted.
2 into the recessed part 19, and then the nut member 22
and segment 7 from the inside of segment 7.
Concluded with 6th prize.

Then, the abutment member 20 pushes the iron plate 6 toward the ground 4 to maintain the gap 11.

Incidentally, after performing the filler lining 2, by removing the bolts 26, the N segment 7 can be removed with the support 10 still embedded.

In addition, as the groove segment 13, FIGS.
The one shown in the figure is appropriate.

That is, the groove segment 13 includes a segment N3a as shown in FIG. 8 that forms the apex of the groove segment lining 14, and a segment N3b as shown in FIG. 9 that forms both sides of the groove segment lining 14. The segment 13a is connected to the invert segment 5 as shown in FIG. ) 13b is the female part 2 which is open on one side.
8, a male portion 29 is formed on the other side, and a segment 13 is formed on the other side.
c has a female part 30 for fitting with the segment) 13b on one side,
A fastening hole 31 for connecting with the invert segment 5 is bored on the other side.

and invert segment 50 segments on both sides) 13
After fixing N3b, the segments 13b are assembled by male and female fitting, and then the segments N3b on both sides are connected by the segments 13a to form the groove segment lining 14.

As explained above, according to the present invention, since the iron plate is disposed on the inner surface of the tunnel, water flowing out from the ground side flows down along the outer surface of the iron plate, and the invert segment is provided with drainage channels and water intake holes. Therefore, the flowing water moves from the water intake hole to the drainage ditch, where it is quickly discharged outside the tunnel. Therefore, when constructing the filler lining using segments, it is possible to prevent water from springing up on the ground side. Even if there is,
Water does not flow into the filling material side and interfere with its hardening action or act to partially wash away the filling material, and the action of spring water pressure on the filling material and segments can be reduced.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention; FIG. 1 is an overall vertical cross-sectional view showing a schematic configuration, FIG. 2 is a configuration diagram around an invert segment, and FIG. 3 explains a filler lining and a segment lining. 4 is a perspective view showing the connection between the invert segments and the segments, FIG. 5 is a cross-sectional view showing the arrangement of the segment lining in the filler lining part, and FIG. 6 is the groove segment lining. 7th cross-sectional view showing the arrangement of
Figures a and b are front and back perspective views of the segment, and Figures 8 to 10 are perspective views showing various configurations of the groove segment. 1...Tunnel pit, 2...Filling material lining, 4...Ground, 5...Invert segment, 6...Iron plate , 7... Segment, 9... Segment lining, 10...
Support, 11...Gap, 13.13a=13b
s13c...Groove segment, 14...
・Gutter segment lining, 15...Drainage ditch, 16
・・・・・・Water intake hole.

Claims (1)

[Claims] 1. An invert segment in which a drainage groove extending in the longitudinal direction of the tunnel shaft is formed along the entire length of the upper surface at a lower position on the inner peripheral surface of the tunnel shaft, and a water intake hole extending in the vertical direction reaching the bottom surface of the drainage trench is bored in the lower surface. are laid continuously in the longitudinal direction of the tunnel, and the segments are sequentially connected from both sides of each invert segment to form an arch, and a steel plate is brought into contact with the ground. 1. A method for lining a tunnel with a filler material, which comprises suppressing and supporting the segment with a support attached to the segment, and after assembling the segment and the steel plate, filling the gap between the segment and the steel plate with a filler material.