JP2755772B2 - Bonding method and device between shield tunnel and structure or shield tunnel - Google Patents

Description

[Detailed Description of the Invention] [Industrial application field] The present invention is implemented when, for example, a junction of an underground road, a junction, a junction of a groundwater channel, a branch of a subway, and the like are constructed by a shield method. The present invention relates to a method for joining between a shield tunnel and a structure or a shield tunnel, and an apparatus for implementing the method.

[Prior Art] One of the conventional methods of joining a shield tunnel is a so-called open cut method. But,
In the case of this excavation, there is a problem that it is difficult to adopt it in a city due to the construction environment, and it becomes expensive when it is deep.

On the other hand, the so-called NATM construction method, in which a tunnel is constructed by spraying and lock bolts, includes a method in which the ground around the tunnel is improved and a so-called pin bridge girder is press-fitted, or a method using a pipe roof together. However, these methods are disadvantageous in that the ground is largely exposed, the ground improvement cost for stabilizing the ground is increased, and when the ground is deep, there is a problem in reliability.

The present invention provides a method for joining between a shield tunnel and a structure or a shield tunnel, which can reduce the construction range of the ground improvement as compared with the conventional construction method and greatly improves workability, economy, and safety during construction. It is intended to provide an apparatus for performing the method.

[Means for Solving the Problems] According to the first method of the present invention, after excavating a shield tunnel along a structure, a plurality of projections are provided when joining the shield tunnel and the structure. Digging while installing a lining body in which a protrusion for joining with the structure is partially formed on the upper and lower portions of the ring-shaped segment by a shield machine, and bringing the protrusion close to the structure. In addition, a segment and a structure between the projections are removed and joined.

According to the second method of the present invention, when joining a plurality of shield tunnels, a lining body having upper and lower projections formed at upper and lower portions at locations facing the preceding shield tunnel and the succeeding shield tunnel, respectively. It is characterized in that the ground improvement part is formed on the ground near the joint part after installing and approaching the opposing protrusions, and the segments between the upper and lower protrusions are removed and joined. .

Further, an apparatus for practicing the present invention includes a computer for excavating a triangular projection provided on an outer shell of a shield machine and a ground at a front portion opposed to the projection provided on a cutter head of the shield machine. A copy cutter inserted and removed by control; and insertion means for inserting a scalable seal member between a space and a segment of a rear portion facing the protrusion.

The triangular protrusion is preferably provided movably on the skin plate of the shield machine, but may be fixed.

Further, it is preferable that the contractible seal member is constituted by an airbag-type seal interposed between the concave portion dug by the copy cutter and the standard segment.

In the first shield machine having a movable projection, the insertion means comprises a shield jack provided on the movable projection and a slide projection slidable on the inner surface of the skin plate pushed out by the jack. Is preferred. In the second shield machine having the fixed projection, the airbag seal is inflated at the beginning of the start, and is installed at the tip (inside) of the projection. When assembling the protruding segment, shrink it, push it out, and when re-installing, insert a new airbag type seal while the protruding segment remains in the tail and inflate it. Can be taken.

In addition, it is preferable to use a deformed segment having a projection in addition to the arc-shaped standard segment.

[Operation] In the first shield machine, a triangular concave portion is dug by a copy cutter slightly before a predetermined section, a movable protrusion is pushed into the concave portion, and a deformed segment is formed on the upper and lower portions of the standard segment. And dig toward the joint side.

In the second shield machine, the concave portion outside the predetermined section is filled with an increased amount of the backfill material.

In the first method, after the ground around the joint is improved as necessary, soil and sand are excavated while removing the segments of the shield tunnel and the walls of the structure on the joint side. Next, concrete is cast between the projections of the irregularly shaped segments and the structure, or a synthetic segment of blecast concrete or steel concrete is incorporated to integrate the shield tunnel with the structure.

In the second method, one of the shield tunnels
The standard segment is assembled in a partially circular shape by arranging the deformed segments vertically, and the opening is covered with a temporary partition wall, and the protrusions of the deformed segments of both tunnels are opposed to each other. Then, the ground around the joint is improved as needed, and the interim is excavated while removing the temporary partition wall and the segment facing the temporary partition wall. Next, concrete is cast between the two tunnels, or the composite segment is incorporated to integrate the two shield tunnels.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

1 to 5 show a shield machine for carrying out the present invention.

At the front of the skin plate 2 of the shield machine, generally designated by the reference numeral 1, a pressurizing chamber 8 is further defined by the partition wall 3 and the cutter head 4, and a detachable tail plate 18 is provided at the rear. An erector indicated by reference numeral 19 is provided as a whole for assembling a standard segment S and a deformed segment S ₁ (hereinafter collectively referred to as a segment S) across the tail plate 18 and the skin plate 2.

The cutter head 4 is rotated by a driving motor 7 provided on the rear surface of the partition wall 3, and a plurality of (12 in the illustrated example) face cutters 5 are provided on the front surface. At multiple locations (three locations in the example shown),
A copy cutter 6 which can be freely taken in and out is provided. The cutter 6 is connected to a computer (not shown) and is taken in and out of the rotating cutter head 4 so as to form upper and lower opposing concave portions D, D indicated by chain lines in FIG.

The pressurizing chamber 8 communicates with the outside through a mud pipe 9 and a drain pipe 10, and an agitator 11 is provided in the chamber.

A movable projection 12 is pivotally attached to the skin plate 2 in the axial direction of a portion facing the copy cutter 6, and has a height H (for example, with respect to an outer diameter of 13900 mm of the skin plate 2) by jacks 13, 13. 900mm) to selectively project in a substantially triangular shape. A plurality of shield jacks are provided on the rear surface of the partition wall 3 along the skin plate 2.
The movable projection 12 is provided with a similar shield jack 14a, and a jack spacer 15 is mounted on the shield jack 14a. On the inner surface of the movable projection 12, a slide projection 17 which constitutes a sealing member insertion means together with the shield jack 14 is slidably provided. In the drawing, reference numeral 20 denotes a tail seal, and reference numeral 22a denotes a state in which an airbag-type seal 22a, which is a scalable seal member attached to a rear portion of the slide-type projection 17, is contracted.

Next, the manner of assembling the segment S by the shield machine 1 will be described.

First, after the ground at the required location is improved as required, the copy cutter 6 is inserted and removed by computer control to excavate the concave portion D (FIG. 6 (a)).

Next, the temporary seal plate 21 is attached to the detachable tail plate 18, the jack spacer 15 is removed, and the airbag seal 22 is inflated and brought into contact with the plate 21 (FIG. 6 (b)).

Next, the movable projection 12 is formed into the concave portion D by the jacks 13 and 13.
(FIG. 6 (c)).

Next, the jack receiving seat 16 is attached to the slide projection 17, the jack spacer 15 is attached to the shield jack 14 a, the shield jack 14 a is extended, and the position of the receiving seat 16 is moved to the jack 14 a side to change the slide projection 17. Then, the seal 22 is pushed out of the assembled standard segment S (FIG. 6D).

Finally, the removable tail plate 18 and the temporary seal plate 21 are removed (FIG. 6 (e)). Incidentally, in the figure, shows a state in which the profiled segments S ₁ on the front side is assembled in the standard segment S, thereafter, go extruded profiled segments to contract the seal 22.

FIGS. 7 to 9 show another embodiment of the shield machine.
This is an example in which 12A is protruded, and the other components are configured in the same manner as in the previous embodiment. When assembling the protruding segment, the contracted air bag type seal 22 is inflated with air from the air supply pipe and pressed against the already assembled standard segment to seal it. Then remove the removable tail plate 18, assembling profiled segments S ₁ dated projections in the space. After becoming the profiled segments S ₁ to 2 ring about the assembly, and the segments and the tail seal contact, to contract the airbag seals 22. FIG. 11 shows a state in which the airbag seal is stored.

Next, an embodiment of the first method will be described with reference to FIGS.

FIG. 12 shows the excavation situation of the shield machine 1A of the general part without the protrusion of the tunnel A, and the concave part D formed by the fixed type protrusion 12A is increased in the injection amount of the backing material indicated by the chain line. Fill. In the shield machine 1, the movable projection 12 is projected slightly before the predetermined section to excavate the concave portion D.

FIG. 13 shows the excavation situation of the shield machines 1 and 1A at the joint portion. The deformed segment S in which a projection is formed on the upper and lower portions of the standard segments S, S. _1, assemble the S _1.

Next, as shown in FIG. 14, if necessary, a solidifying material is injected into the ground around the joint from the tunnel A and the structure C side, for example, in the direction of the arrow, and the ground improvement parts E, E indicated by oblique lines are shown. To form

Next, as shown in FIG.
In the example shown in FIG. 2, the ground is excavated toward the structure C while the four standard segments S are removed.

Finally, as shown in FIG.
And removing the wall portion C ₁ of the side structure C and profiled segments S _1,
A portion between the S _1, the concrete was Da設or precast concrete, synthetic segment F of the steel concrete built to completion by integrating the tunnel A and the structure C.

An embodiment of the second method will be described with reference to FIGS. 17 to 21.

FIG. 17 shows the excavation situation of the preceding shield machine, and the tunnel A is a partially circular segment formed by assembling a plurality of (six in the illustrated example) standard segments S in which deformed segments S ₁ and S ₁ are arranged vertically. and segment assembly, made from the opening cover temporary partition wall S ₂ Prefecture, segment S ₂ outside is covered with Urakomi injection material G having substantially the same properties as natural ground.

FIG. 18 shows the excavation situation of the succeeding shield machine. The tunnel B is composed of a plurality of (seven in the example shown) standard segments Sa in which deformed segments S _1a and S _1a are arranged vertically. The projections of the segments S ₁ and S _1a are opposed.

In FIG. 19, tunnels A and B
The ground improvement parts E, E are formed by injecting a consolidated material from the side.

Next, as shown in FIG. 20, in the illustrated example of the side of the tunnel B facing the tunnel A, three standard segments Sa are shown.
Is removed, and the sediment between the upper and lower protrusions and the backfill material G are removed toward the tunnel A.

Finally, as shown in FIG. 21, the deformed segment S ₁ ,
And Da設concrete during S _1a, or precast concrete, incorporate synthetic segment F of the steel concrete, after integrating both tunnel A, a B, temporary partition wall S ₂
And complete the construction.

Depending on the construction procedure, a temporary support may be provided for the tunnel B before removing the standard segment between the protrusions.

[Effects of the Invention] Since the present invention is configured as described above,
The following effects are obtained.

That is, since the distance between the projecting portion of the irregularly shaped segment and the structure or between the projecting portions can be extremely small, the area or period for opening the ground compared to the conventional crossed girder press-fitting method or the pipe roof combined method. And the range or quality of ground improvement can be suppressed.

In addition, since the projection can be provided integrally with the temporary lining, a smooth joining shape can be realized. Therefore, the generated stress is reduced, and a slender and economical structure can be obtained. On the other hand, in the conventional method, since a bent portion is formed in the structure, the strength cannot be satisfied without the central pillar.

Also, since a plurality of structures can be integrated into an arbitrary shape, a large underground space can be constructed by combining the structures.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing a first embodiment of a shield machine embodying the present invention, FIGS. 2 and 3 are views taken along arrows A and B of FIG. 1, and FIG. FIG. 5 is a side sectional view showing the periphery of the projection, FIG. 5 is a sectional view taken along line DD of FIG. 4, and FIG.
(A) to FIG. 6 (e) are drawings corresponding to FIG. 4, and FIG. 7, FIG. 8, FIG. 9 and FIG. FIGS. 1, 2, 3 and 4 respectively show a second embodiment of the present invention, FIG. 11 is a drawing corresponding to a part of FIG. Figure 12
FIG. 16 is an axial cross-sectional view of a tunnel illustrating an embodiment of the first method, and FIGS. 17 to 21 are axial cross-sectional views of a tunnel illustrating an embodiment of the second method. A, B: Shield tunnel, C: Structure, C: Standard segment, S ₁ : Deformed segment, 1, 1A: Shield machine, 2: Skin plate, 3: Bulkhead, 4 ... Cutter head, 5 ... Cutter bit, 6
…… Copy cutter, 7… Cutter driving motor, 8
…… Chamber, 9 …… Sludge pipe, 10 …… Sludge pipe, 11 ……
Agitator, 12… Movable projection, 12A …… Fixed projection, 1
3 ... Jack for pushing out protrusion, 14, 14a ... Shield jack, 15 ... Jack spacer, 16 ... Screw jack seat, 17 ... Slide projection, 18 ... Removable tail plate, 19 ... Electa , 20 ... Tail seal for protrusion, 21 ... Temporary seal plate, 22 ... Airbag seal

Continued on the front page (73) Patent holder 999999999 Shimizu Corporation 2-16-1, Kyobashi, Chuo-ku, Tokyo (73) Patent holder 999999999 Nippon Steel Corporation 2-6-1 Otemachi, Chiyoda-ku, Tokyo (73) Patent Holder 999999999 Nishimatsu Construction Co., Ltd. 1-20-10 Toranomon, Minato-ku, Tokyo (73) Patent Holder 999999999 Mitsui Construction Co., Ltd. 3-1-1, Iwamotocho, Chiyoda-ku, Tokyo (72) Invention Person Yoshio Adachi, 1st Asahi, Asahi, Tsukuba, Ibaraki Pref. (72) Inventor: Toshinori Mizutani 1st: Asahi, Tsukuba, Ibaraki, Japan Inst. No. 1 Asahi Inside the Public Works Research Institute of the Ministry of Construction (72) Inventor Takashi Wanashi 2-2-1 Otemachi, Chiyoda-ku, Tokyo Inside Ishikawajima-Harima Heavy Industries Co., Ltd. No. 7 Kashima Construction Co., Ltd. (72) Inventor Shuji Kuraki Nihonbashi, Chuo-ku, Tokyo 4-12-20 Honcho Sato Kogyo Co., Ltd.Tokyo Head Office (72) Inventor Hideki Hagiwara 2-16-1, Kyobashi, Chuo-ku, Tokyo Shimizu Construction Co., Ltd. (72) Inventor Minoru Nakamura Otemachi, Chiyoda-ku, Tokyo 2-6-3 Nippon Steel Corporation (72) Inventor Hiroo Iso 1-20-10 Toranomon, Minato-ku, Tokyo Nishimatsu Construction Co., Ltd. (72) Inventor Toshio Hayashi 3 Iwamotocho, Chiyoda-ku, Tokyo No. 10-1, Mitsui Construction Co., Ltd. (56) References: Jikken Sho 45-1892 (JP, Y1) (58) Fields investigated (Int. Cl. ⁶ , DB name) E21D 11/04 E21D 11/08

Claims (3)

(57) [Claims] When a shield tunnel is dug along a structure and then joined to the structure, the structure is partially formed into a ring-shaped segment by a shield machine having a plurality of projections. Digging while installing a lining body formed with upper and lower projections for joining with the above, after bringing the projection close to the structure, removing the segment and the structure between the projections A method of joining a shield tunnel and a structure, which is characterized by joining. 2. When joining a plurality of shield tunnels, a lining body having projections outwardly formed on the upper and lower portions is installed at a position where the preceding shield tunnel and the succeeding shield tunnel face each other. The ground improvement part is formed on the ground near the joint after the protruding part that approaches
A method for joining between shield tunnels, wherein segments between upper and lower protrusions are removed and joined. 3. A special cutter provided on an outer shell of the shield machine, a special cutter for excavating a ground portion at a front portion opposed to the protrusion provided on a cutter head of the shield machine, and the protrusion. And an insertion means for inserting an expandable and contractible seal member between a space in a rear portion facing the portion and the segment.