JP4500195B2 - Extended segment water stop method and synthetic segment with water stop sheet - Google Patents

Description

  The present invention relates to a water stop method for an expansion segment and a synthetic segment with a water stop sheet.

  Conventionally, in a shield tunnel, for example, in order to construct a merging / merging portion, an emergency parking zone, etc. in a road tunnel, it may be necessary to partially push out the segment ring to the ground.

  For example, road tunnel merging and merging sections are constructed by arranging shield tunnels side-by-side, extruding the expanded segments partially from the segment ring of each shield tunnel to the ground, and connecting those widened segments with steel shells. There is a way to do it.

  Moreover, as construction of an emergency parking zone, there is a method in which a segment dedicated to widening is assembled into a circular shape in the emergency parking zone, and the widened segment is formed by pushing the segment dedicated to widening outward (see Non-Patent Document 1). .

At this time, as shown in FIG. 3, water stoppage between the extension segment 2 and the surrounding segment (outer frame segment 3) becomes a problem. Conventionally, the extension segment 2 and the surrounding segment (outer frame segment 3) are problematic. It was considered to install a ring-shaped water seal 6 between the two.
Developed “Road Tunnel Shield System” to meet the needs of every underground road tunnel, Partial Widening Shield Construction Method [VASARA Shield Construction Method] Reference Material 3, May 9, 2003, Internet <http: // www. kajima. co. jp / news / press / 200305 / 9c1fo-J. htm>

  However, when the shield tunnel is constructed at a deep depth (depth of 40 m or more), the groundwater pressure increases, so it is not easy to stop the water when pushing out the expansion segment, and a reliable water stopping method has been demanded.

  An object of the present invention is to ensure water stoppage between an expansion segment and its surrounding segments when the expansion segment is pushed out to the natural ground side.

  In order to solve the above-described problems, the invention according to claim 1 is, for example, as shown in FIGS. 1 and 2, an extended segment 2 that is partially pushed out from the lining segment ring to the ground and the surrounding segments. In the water stopping method of the extension segment 2 that stops water between the (outer frame segment 3), the water stop sheet 4 is installed on the surrounding segment so as to cover the outer surface of the expansion segment 2 on the natural ground side, When the expansion segment 2 is pushed out, the water stop sheet 4 is pushed and spread while being stopped.

  In this way, the water stop sheet 4 is installed on the surrounding segments of the expansion segment 2 so as to cover the outer surface of the expansion segment 2 on the natural ground side, and the expansion segment 2 is pushed out to the natural ground side while spreading the water stop sheet 4. Thus, when the expansion segment 2 is pushed out, water can be reliably stopped between the expansion segment 2 and the surrounding segments.

  Here, as an expansion segment pushed out to the natural ground side, one that is incorporated so as to be partially pushed out in one segment, one that is assembled so as to be pushed out by a segment constituting the segment ring, and the like can be cited. Further, a plurality of such extended segments are continuously provided in the axial direction or the circumferential direction and are sequentially extruded.

  The invention described in claim 2 is, for example, as shown in FIGS. 1 and 2, in the water stop method for the extension segment 2 according to claim 1, the water stop sheet 4 is installed and the water stop sheet 4 is A protective plate 5 that covers the natural mountain side is provided.

  Thus, by providing the protection plate 5 so as to cover the ground mountain side of the waterproof sheet 4 installed in the surrounding segments, the waterproof sheet 4 can be protected from the tail seal of the shield machine.

  The synthetic segment 1 with the waterproof sheet 4 according to the third aspect of the invention comprises, for example, as shown in FIGS. 1 and 2, an extended segment 2 that is partially pushed out to the natural ground side and an outer frame segment 3 around it. The composite segment 1 is installed on the outer frame segment 3 so as to cover the outer surface of the expansion segment 2 on the ground mountain side, and is expanded when the expansion segment 2 is pushed out, and the expansion segment 2 and the outer segment A water stop sheet 4 for stopping water between the frame segments 3 is provided.

  In this way, the water stop sheet 4 is installed on the outer frame segment 3 so as to cover the outer surface of the expansion segment 2 on the natural ground side, and the expansion segment 2 is pushed out to the natural ground side while expanding the water stop sheet 4. When the segment 2 is pushed out, water can be reliably stopped between the expansion segment 2 and the outer frame segment 3.

  The invention described in claim 4 is, for example, as shown in FIGS. 1 and 2, in the synthetic segment 1 with the waterproof sheet 4 according to claim 3, a protective plate 5 is provided to cover the ground mountain side of the waterproof sheet 4. It is characterized by.

  In this way, by providing the protective plate 5 so as to cover the ground mountain side of the waterproof sheet 4 installed in the outer frame segment 3, the waterproof sheet 4 can be protected from the tail seal of the shield machine.

  According to the present invention, the water stop sheet is installed on the periphery of the expansion segment so as to cover the outer surface of the expansion segment on the natural ground side, and the expansion segment is pushed out while the water stop sheet is spread out. The water can be reliably stopped between the other segments.

Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the drawings.
The synthetic segment 1 with a water stop sheet according to the present embodiment is applied to the construction of the merging / merging portion of the shield tunnel. For example, in a shield tunnel constructed side by side in the ground, the extension segment 2 is pushed out from each segment ring, and both the extension segments 2 are connected by a steel shell so that both shield tunnels are connected to construct a branching junction. Applies to cases.

  As shown in FIGS. 1 and 2, the synthetic segment 1 with a water-stop sheet is made of steel, and an extended segment 2 that is partially pushed out to the natural ground side, and an outer frame segment 3 (surrounding segment) around it. It consists of and. The expansion segment 2 is incorporated in the outer frame segment 3 so as to be slidable in the vertical direction. Further, the extension segment 2 can be pushed out by a jack or the like.

  And the water stop sheet | seat 4 is installed in the outer frame segment 3 so that the outer surface of the natural mountain side of this expansion segment 2 may be covered. The outer end portion of the water blocking sheet 4 is fixed in a watertight manner over the entire circumference of the inner end portion on the outer surface of the natural mountain side on the expansion segment 2 side. In addition, the water stop sheet | seat 4 is previously formed so that it may spread in predetermined magnitude | size and shape by extrusion of the expansion segment 2. FIG.

  When lining the segment ring, as shown in FIG. 2 (a), the extended segment 2 is slid slightly inward from the outline of the segment ring, and the waterproof sheet 4 is folded in the gap. Install it. As a result, when the expansion segment 2 is extruded, as shown in FIG. 2B, the water stop sheet 4 is expanded by the amount of folding, and the outer surface of the expanded expansion segment 2 is formed into a film shape. Cover. For this reason, when pushing out the expansion segment 2, the water stop between the expansion segment 2 and the outer frame segment 3 can be ensured.

  Here, as the water stop sheet | seat 4, what was shape | molded in the sheet form with rubber | gum which has water stop, a reinforced plastic, etc. is mentioned. Since it has flexibility, it can be deformed to some extent when it is extruded.

  Further, a protective plate 5 is provided on the outer surface side (natural ground side) of the water stop sheet 4 so as to cover the outer surface. Thereby, a rubber sheet can be protected from the tail seal of a shield machine, damage can be prevented, and the waterproofness of the waterproof sheet 4 can be ensured.

  In the embodiment described above, the water stop method for the extension segment of the present invention is applied to the composite segment having the extension segment in the construction of the merging / merging portion of the shield tunnel, but the present invention is limited to this. However, the present invention may be applied to expanding a segment constituting a segment ring when widening a tunnel cross section such as an emergency parking zone of a road tunnel.

  In addition, the water-stop sheet 4 is molded from rubber or reinforced plastic, but the present invention is not limited to this, and any water-proof sheet may be used as long as it can secure water-stop and can be expanded by extrusion of the expansion segment 2. . The protective plate 5 may be made of any material as long as it can protect the water-stopping sheet 4 and prevent damage. In addition, it is needless to say that specific detailed structures and the like can be appropriately changed.

It is a perspective view which shows the synthetic segment with a water stop sheet | seat which shows the structure of one Embodiment to which this invention is applied. It is sectional drawing which shows the state of a synthetic | combination segment, (a) is at the time of the lining of a segment ring, (b) shows the state of the synthetic segment at the time of extrusion of an expansion segment. It is a perspective view which shows the water stop method in the conventional synthetic | combination segment.

Explanation of symbols

1, 10 Composite segment 2 Expansion segment 3 Outer frame segment (surrounding segments)
4 Water stop sheet 5 Protection plate 6 Water stop seal

Claims (4)

A water stop method for an expansion segment that stops water between an extension segment that is partially pushed out from the lining segment ring to the ground and the surrounding segments,
A water stop sheet is installed on the surrounding segment so as to cover the outer surface of the expansion segment on the ground mountain side, and when the expansion segment is pushed out, the water stop sheet is pushed and spread while the water is stopped. Water stop method.   2. The water stop method for an extension segment according to claim 1, wherein the water stop sheet is installed and a protection plate is provided to cover a ground mountain side of the water stop sheet. A composite segment composed of an extended segment that is partially pushed to the natural ground side and an outer frame segment around it,
A water-stop sheet that is installed on the outer frame segment so as to cover the outer surface of the expansion segment on the natural ground side, and stops the water between the expansion segment and the outer frame segment while being expanded when the expansion segment is pushed out. A synthetic segment with a waterproof sheet, characterized by comprising:   The synthetic | combination segment with a water stop sheet | seat of Claim 3 provided with the protective plate which covers the natural mountain side of a water stop sheet | seat.

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