JPS5818519B2 - Jiyu Tenzai Sekidomekousou - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention utilizes RTM (Rock Tunneling).
The present invention relates to a filler dam structure for constructing a filler lining to support a tunnel excavated by a machine, blasting method, shield method, or the like.

Traditionally, when constructing tunnels, wooden supports, steel arch supports, or segments were used to support the ground.

In the case of wooden shoring and steel arch shoring, the shoring was made temporary and a concrete lining was rolled up from the inside to make the shoring a permanent lining.

Regarding segments, there are two methods: temporary lining, similar to the wooden shoring and steel arch shoring mentioned above, and concrete lining from the inside to create a permanent lining, and segment lining itself as a permanent lining. There was a coexistence with the idea of

By the way, when using shoring, the shoring only touches the ground through the sheet piles and wedges, so
If care is not taken during construction, there is a risk that sufficient contact between the shoring and the ground will not be maintained, causing bending of the shoring and reducing the load-bearing capacity of the shoring.

In other words, in order to create an axial force state in the shoring, it is necessary to make contact with the ground as complete as possible.
Great care must be taken when using shoring.

On the other hand, when using segments, the contact between the segments and the ground can be completed by performing backfill injection between the segment lining and the ground, and therefore, according to the segment, its load-bearing capacity is Can fully demonstrate.

However, if the segments themselves are used as shoring materials or permanent linings, the construction cost will increase, and even though it is mechanically reasonable, there will still be economic problems.

The present inventor has previously proposed a method for constructing a tunnel lining devised to solve this problem, and the present invention proposes an effective filler dam structure to be employed therein.

That is, when constructing a tunnel, segments are used as supporting materials, the segments are assembled concentrically with the tunnel excavation cross section, and after assembly, a support that can move in and out of the segment in the outer diameter direction is crimped or penetrated into the ground. Temporarily support the ground with the segment lining through the support, and ensure approximately equal gaps between the ground and the segments,
This segment lining is performed using segments provided with weir plates at appropriate intervals in the longitudinal direction of the lining.

Next, the gap between the weir plates is filled with a filler material as appropriate depending on the conditions of the ground at the face and the work status of the face to ensure close contact between the segments and the ground.

After filling with this filler, the earth load can be evenly supported over the entire surface of the segment lining through the filler, so the segments can fully demonstrate their load-bearing capacity.

If the filler is hardening, it can support the ground with its strength after hardening, and if it is non-hardening, it can be bonded by injecting a binder. However, it can support the ground due to its strength.

When the filler is hardened and bonded in this manner, the segments serve only as formwork, and can be appropriately removed and reused for segment lining on the face side.

Then, in the same manner, the filler is sequentially filled in each section between the weir plates, and a shoring structure can be constructed from the hardened and bonded filler.

On the other hand, although the hardened and bonded filler itself serves as a lining, if a concrete lining is placed inside the segment at the same time as the segment is removed, the lining's function can be further strengthened.

Further, in this case, since the inner surface of the hardened and bonded filler is smooth, it can be completely waterproofed, and this effect is well suited to the purpose of making the concrete lining to be rolled also serve as a waterproofing material.

In the present invention, a weir plate is removably attached to the outside of the segment-side surface at the weir loss portion of the filler,
An appropriate gap is provided between the inner circumferential end surface of the weir plate and the inside of the segment 7, and an appropriate gap is provided between the inner peripheral end surface of the weir plate and the inside of the segment 7, and the inner circumference of the weir plate is provided between one side of the weir plate attachment side of the segment and the adjacent segment side. By interposing a spacer having a protrusion for forming a caulking groove in contact with the end face, a caulking groove is formed at the joint portion of the filler lining divided by the weir plate when the segment is removed.

Therefore, by filling this groove with caulking material, it is possible to eliminate water leakage from the joint portion while employing a method of filling the filler into each section.

Next, a case where the present invention is applied to the RTM construction method as an embodiment of the present invention will be explained based on the drawings.

In Figure 1, a tunnel shaft 3 is installed in the ground 1 by RTM2.
While excavating, segments 4 are sequentially assembled at the rear of this RTM 2, and segment lining 5 is performed.

At this time, the segment lining 5 tends to be eccentric with respect to the tunnel shaft 2, as shown in Fig. 2a, and the gap δ between the ground 1 and the segment lining 5 is small at the bottom and becomes large at the top. Since the thickness of the hardened filler layer serving as the support becomes uneven and the strength becomes weak, it is necessary to align the centers of the tunnel shaft 3' and the segment lining 5 as shown in FIG.

Therefore, as shown in FIG. 3, several holders 6 are protruded from the outside of the segments 4, and the ground 1 is supported by the locking of the holders 6, so that the segment lining 5 is concentric with the tunnel shaft 3. keep it in shape.

In this way, when the length of the segment lining 5 becomes suitable for one time of pouring the filling material, for example, about 20 m, the segments 7 with the dam plate 8 attached are assembled and the segment lining for dam stop is assembled. Perform step 9.

This weir plate 8 has a filling material filled in the gap δ in the tunnel shaft 3.
This is to prevent the filling material from flowing out to the front of the RTM 2. This allows the segment lining 5 to be separated from the construction of the segment lining 5 at the rear of the RTM 2, and the filling material can be filled section by section at the required time.

After the dam-stopping segment lining 9 is completed, the segment lining 5 is constructed in the same manner as described above.

In this way, when the RTM 2 moves forward and there is no competition with its face work, it is necessary to pour concrete as a hardening filler into the gap δ between the weir plates 8 and 8 as soon as possible, or pour gravel as a non-hardenable filler. After injecting crushed stone or debris, backfilling is performed by injecting cement milk as a binder.

When this backfilled filler hardens and becomes the filler lining 10, and a predetermined strength for shoring is obtained, the five segments 4 are removed while the supports 6 are embedded, as shown in FIG. This filler lining 10 supports the load of the earth 1.

On the other hand, the removed segments 4 and 8 are sequentially used in circulation to assemble segment linings 5 and 9 at the rear of the RTM 2, as shown in FIG.

Next, the segment lining for damming 9 which is the main part of the present invention
The parts will be explained in detail with reference to FIGS. 5 to 7.

In FIG. 5, the dam plate 8 is provided with an L-shaped support member 11 so as to be located outside the dam-blocking side-side surface 7a of the segment T.
The side arm 11b of this support member is fixed to the upright arm 11a of the
2 is interposed therebetween, and is detachably attached to the side surface of the segment by a bolt 13 passed through from the inside of the segment 7.

Then, a suitable gap is provided between the inner circumferential end surface 8a of the weir plate 8 and the segment side surface circumferential surface, and a sealing rubber lining 14 is pasted on the weir plate inner circumferential end surface 8a and outer circumferential end surface 8b for sealing. It is designed so that it can be applied.

Further, between one side surface 7a of the segment 7 on the weir plate mounting side and the side surface 4a of the adjacent segment 4, there is a trapezoidal caulking groove forming protrusion 16 that comes into contact with the inner circumferential end surface of the weir plate.
A spacer 15 is interposed therebetween, and the segments 4 and 7 are fastened together with bolts with this spacer 15 interposed.

In addition, as shown in FIG. 5, it is desirable to insert a rubber gasket 17 at the circumferential joint portion of the weir plate 8 to completely eliminate leakage of the filler material.

In the state shown in FIG. 5, one section of the filler lining 10 has been completed, and in front of it, the segment lining 5 and the segment lining F for damming have been constructed.

When the filler lining 10 is hardened and bonded, the segment 4 of the partitioned portion is removed as shown in FIG.
, the support member 11 and the cone-shaped collar 12 are lined with a filler material 1
0\only that segment will be removed 4
At this time, since the cone-shaped collar 12 is interposed, L
The horizontal arm 11b of the character-shaped support member 11 is not exposed to the inner circumferential surface of the filler lining 10, and the lower end of the rising arm 11a of the support member 11 is aligned with the inner circumferential end surface 8a of the weir plate 8 due to the interposition of this collar 12. - or higher level, therefore, the lower end of the rising arm 11a is no longer located on the side surface of the caulking groove forming protrusion 16, and the filler is completely filled in this area, and there is no damage. A caulking groove is obtained.

Next, a bracket 18 is bolted to the rear end surface 4a of the segment 4 with a spacer 15 interposed therebetween, and this bracket 18 is bolted to the support member 11 embedded in the filler lining 10 using bolts 19. By fixing, the segment lining 5 of the next section is reinforced with the filler lining 10, thus filling the gap between this weir plate 8 and the weir plate 8 in front of it with the filler.

After the filler is hardened and bonded, the segment 4 and spacer 15 in this section are removed as shown in FIG. 7, and a caulking groove 20 is formed at the joint between the filler linings 10, 10.

If this caulking groove 20 is filled with caulking material,
- While constructing the filler lining 10 for each section, the joints can be completely sealed, and shallow water from the joints can be eliminated.

In addition, if the load of the filler lining 101 constructed in this way or the ground 1 is small, it is possible to use a permanent lining as it is, but it is also possible to line it with concrete as a permanent lining from the inside. In that case, for example, it may be carried out after forming the filler lining 10 over the entire length of the tunnel, or it may be carried out sequentially while removing the segments 4.

Next, a specific example of the structure of the segments 4 and the support 6 will be explained. As shown in FIG. 8, the segments 4 have fastening holes 21 for fastening and assembling the segments,
In order to insert and attach the support 6, the segment 4 has an appropriate number of recesses 22 recessed on the outer surface thereof, and an insertion hole 23 formed at the center thereof, and backfilling is performed as appropriate. Hole 24 must be drilled.

Further, as shown in FIG. 3, the support 6 includes a nut member 25 that fits into the recessed portion 22, a pressing screw shaft 26 screwed into the nut member 25, and a tip of the pressing screw shaft 26. The contact member 27 is attached to the contact member 27.

Then, the support 6 is inserted from the outside of the segment 4, and with the nut member 25 fitted into the recess 22, the nut member 25 and the segments 1 to 4 are fastened from the inside of the segment 4 with bolts 28 or the like. do.

After the segments 4 are assembled and the segment lining 5 is performed, the pressing screw shaft 26 is rotated so that the abutment member 27 at the tip thereof protrudes in the outer radial direction to press or penetrate into the ground surface. The segment lining 5 is held concentrically with the tunnel shaft 3 as shown in FIG.

Further, after the filler hardens, the X segment 4 can be removed with the support 6 still embedded by removing the bolt 28.

Although only the RTM construction method has been described in the above embodiments, it is clear that the present invention can be applied even if the tunnel shaft 3 is excavated by the blasting method, and can also be applied to the shield construction method.

The present invention can be carried out as shown in the above embodiments, and since the weir plate can prevent the filling material from flowing out to the front of the tunnel shaft, it is suitable for one-time filling material casting. It is possible to fill the gap with filler material for each section of length, and it is also possible to separate the segment lining construction at the rear of the face and construct the filler lining at the required time, making it efficient when necessary. Particularly, if the dam structure of the present invention is used, caulking grooves can be formed at the joints of the filler lining while lining with the filler for each stroke as described above. Therefore, by filling the inside of the roof with caulking material, water leakage from the joints can be eliminated.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a longitudinal cross-sectional side view when applied to the RTM construction method, FIGS. 2 a and b are cross-sectional views showing the relationship between the segment lining and the tunnel shaft, and FIG. The figure shows a partially enlarged cross-sectional view during segment lining, Fig. 4 shows a partially enlarged cross-sectional view after filling material lining, Fig. 5, 31, Fig. 6 a and Fig. 7 show the construction order in the dam section. Longitudinal side view, Figure 5 is a view from the A-A arrow in Figure 5a, Figure 6 is Figure 6a
FIGS. 8a and 8b are perspective views of the front and back sides of the segment. 1... Earth, 2... RTM, 3.
...Tunnel pit, 4...Segment, 5
...Segment lining, 6...Support,
I... Segment for weir stop, 8... Weir plate, 8a... Inner peripheral end surface of weir plate, 9... Segment lining for weir stop, 10 ...filler lining,
11... L-shaped support member, 11a...
Standing arm, Ilb... Lateral arm, 12...
Cone-shaped collar, 15...Spacer, 16...
... Protrusion for forming caulking groove, 20 ... Caulking groove, δ ... Gap.

Claims (1)

[Claims] 1. A weir plate is removably attached to the outside of the segment-side surface, with an appropriate gap between the inner circumferential end surface of the weir plate and the outer circumferential surface of the segment, and one side of the segment on the weir plate installation side and A filler damming structure characterized in that a spacer having a protrusion for forming a caulking groove that comes into contact with the inner peripheral end surface of the dam plate is interposed between the adjacent segment side surface.