JP2989413B2 - Tunnel junction segment, tunnel junction structure and tunnel connection method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tunnel junction segment for lining a tunnel and a tunnel junction.
The present invention relates to a structure and a tunnel connection method.

[0002]

2. Description of the Related Art In recent years, a shield method has been frequently used in the construction of a subway or the like in an urban area in place of a digging method. When constructing a large section such as a subway station by such a shield method, the roof shield method,
Various construction methods, such as a bridge girder construction method and a circular multiple shield construction method, are used. However, all of these construction methods have a circular cross section of the tunnel, which causes various problems. In order to solve the above problem, the applicant of the present application has developed a method such as Japanese Patent Application No. 4-104039.

[0003] When employing the PC structure in such a method, as shown in FIG. 5, by drilling a natural ground 30 between a rectangular cross section of the shield tunnel 20 constructed in close proximity to the parallel form, opposite its After dismantling the segment 20a
PC steel wire over between these shield tunnel 20 4
0 and place concrete on the inner surface of shield tunnel 20
To lining

[0004]

However, in the above-mentioned construction method, the structure of the anchoring portion of the PC steel wire is very important, and it is desirable that the segments be tensioned as an integral structure. Is difficult to fix, and the segments are not tensioned as an integral structure. The present invention has been made in view of the above problems, its object, along with enable easy fixing work of PC steel wire, segment is the tunnel junction for segments and tension as a unitary structure of the shield tunnel Tonne
The junction structure and tunnel connection method.
You.

[0005]

A means for solving the above problems is that the segments for tunnel junction are parallel and close to each other.
Shield tunnel constructed in contact with PC steel wire
A segment for joining together
A fixing bracket for PC steel wire is provided on the back of the
Openings are formed on both sides of the fixing bracket for PC steel wire.
At the same time, on the upper surface of the fixing bracket for PC steel wire, the PC steel wire
Is provided. Also tunnel
The joint structure is a rectangular cross-section
Excavation between the tunnels and the shield tunnels
Cast inside steel segments lined with channels
The shield tunnels communicate with each other by concrete
Buried in the concrete, and one end on both sides
Steel wire anchored in a segment of a shield tunnel in Japan
Tensions the anchor in the middle between the shield tunnels
It is characterized by being fixed. Tunnel connection method is appropriate
Parallel and close cross section rectangles between shafts drilled at intervals
Of building a shield tunnel with a shape
Of the opposite wall segment located along the long side of the tunnel
Demolition and open excavation of the ground were carried out, and
And the shield tunnels on both sides
Fixing one end of the PC steel wire to the segment;
Cast concrete inside the shield tunnel
Burying the PC steel wire in the concrete,
Fixation at the center between the shield tunnels after curing
Fixing the other end of the PC steel wire to the body.
It is characterized by that .

[0006]

By providing the fixing member for the PC steel wire on the back surface of the segment, the fixing operation of the PC steel wire can be easily performed, and the segment can be tensioned as an integral structure of the shield tunnel. it can.

[0007]

An embodiment of the present invention will be described below with reference to the drawings. 1 is a rear view of a segment according to a first embodiment of the present invention, (1) and (2) of FIG. 2 are enlarged cross-sectional views of a fixing bracket for a PC steel wire, and FIG. 4 is a PC steel wire between adjacent shield tunnels. It is sectional drawing in which was arrange | positioned.

The segment 1 of the present invention is a steel segment, and has a flange 1a protruding from a peripheral surface thereof.
a is provided with bolt holes 1b for connecting the segments, and a plurality of fixing members 2 for PC steel wires are provided on the back side.
It has. The fixing member 2 for a PC steel wire has openings 3 on both sides, and has an insertion hole 4 for a PC steel wire on the upper surface thereof. When fixing the fixing end of the PC steel wire 5 with the nut 6, the end of the PC steel wire 5 is inserted into the insertion hole 4 of the fixing bracket 2 for the PC steel wire as shown in (1) of FIG. Then, the fixing is performed by screwing the nut 6 into the screw portion 5a. When the fixing end of the PC steel wire 5 is stopped by a wedge, as shown in FIG. 2B, the end of the PC steel wire 5 is attached to the anchor head 7 attached to the fixing bracket 2 for the PC steel wire. The fixing is performed by inserting and fitting the wedge 7a. All such fixing operations are performed from the openings 3 on both sides of the fixing member 2 for PC steel wire.

Next, the case where the shield tunnel 8 constructed by using these segments 1 is joined will be described. This is a rectangular shield tunneling machine 9 as shown in FIG. 3, which excavates parallel and adjacent tunnels between the shafts drilled at appropriate intervals, and wraps steel segments there to form a shield tunnel having a rectangular cross section. Build 8 closely.

After the left and right shield tunnels 8 are constructed, the appropriate area of the ground is improved and the water is stopped.
Open excavation of the ground is performed by dismantling the segments 1 of the opposing wall in the long-side direction and, at the same time, dismantling these segments 1, and bridging the retaining steel plate 10 between the shield tunnels 8.

Next, when the ground tunnel is excavated and the left and right shield tunnels 8 communicate with each other, the end of the PC steel wire 5 is fixed to the fixing bracket 2 for the PC steel wire of the segment 1, and
An inner mold is formed inside the shield tunnel 8. At this time, an arrangement portion 8a of the tension jack is also formed at the center between the shield tunnels 8.

Then, concrete 11 is poured into the formwork, and after the concrete 11 is hardened, the PC steel wire 5 is tensioned by the tension jack arranged in the arrangement portion 8a and is fixed to the fixing body 12. Left and right shield tunnel 8
Can be integrally joined.

[0013]

By providing a fixing member for PC steel wire on the back surface of the segment, the fixing operation of the PC steel wire can be easily performed, and the segment can be tightened as an integral structure of the shield tunnel. Also, close shielded
The channels can be integrally joined.

[Brief description of the drawings]

FIG. 1 is a rear view of a segment.

FIGS. 2A and 2B are enlarged cross-sectional views of a fixing bracket for a PC steel wire.

FIG. 3 is a front view of the shield machine.

FIG. 4 is a cross-sectional view of the shield tunnel that has been lining.

FIG. 5 is a sectional view of a shield tunnel showing a conventional joining method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Segment 2 Fixing bracket for PC steel wire 3 Opening 4 Insertion hole 5 PC steel wire

────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Toru Taniguchi 1-7-1 Kyobashi, Chuo-ku, Tokyo Toda Construction Co., Ltd. (72) Inventor Masahiro Nakagawa 1-7-1 Kyobashi, Chuo-ku, Tokyo Toda Construction Co., Ltd. (72) Inventor Yuji Tategawa 1-7-1 Kyobashi, Chuo-ku, Tokyo Toda Construction Co., Ltd. (72) Inventor Makoto Enkawa 1-7-1 Kyobashi, Chuo-ku, Tokyo Toda Construction Co., Ltd. (72) Inventor Masakazu Fukuwaka 2-3-2 Uchisaiwaicho, Chiyoda-ku, Tokyo Kawasaki Steel Corporation Tokyo headquarters (72) Inventor Takashi Hiramoto 2-3-2 Uchisaiwaicho, Chiyoda-ku Tokyo Tokyo headquarters (72) Inventor Hideyuki Kobayashi 2-3-2 Uchisaiwai-cho, Chiyoda-ku, Tokyo Kawasaki Steel Corporation Tokyo Main Office (72) Inventor Osamu Hashimoto 2-Uchisaiwai-cho, Chiyoda-ku, Tokyo No.2-3 Kawasaki Steel Corporation Tokyo Head Office (56) References JP-A-4-1400 (JP, A) JP-A-3-212599 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) E21D 11/14 E21D 9/06 301 E21D 11/04

Claims (5)

(57) [Claims] 1. A shield constructed in parallel and close proximity
Seg for integrally connecting channels with PC steel wire
And projecting inward from the back of the segment body
The fixing bracket for PC steel wire is provided, and the fixing bracket for PC steel wire is provided.
Openings are formed on both sides, and fixing metal for PC steel wire
That the PC steel wire insertion hole was provided on the upper surface of the tool
Characteristic segment for tunnel junction. 2. The fixing device for a PC steel wire according to claim 1, wherein
The metal fitting is formed by inserting the fixing portion of the PC steel wire into the insertion hole.
Fixing the PC steel wire by fixing with nut
And a segment for a tunnel junction. 3. The fixing device for a PC steel wire according to claim 1, wherein
The metal fitting is formed by inserting the fixing portion of the PC steel wire into the insertion hole.
The PC steel wire was fixed by fitting with a wedge
A segment for a tunnel junction, characterized in that: 4. A rectangular cross section constructed in parallel and close to
Excavation of ground between shield tunnels and these shields
Poured inside a steel segment lining a tunnel
The shield tunnels are linked by
And buried in the concrete, one end of which
PC steel anchored in the side shield tunnel segment
The wire is tight against the anchor in the center between the shield tunnels.
Tunnel junction structure characterized by being stretched and fixed. 5. Parallel between shafts drilled at appropriate intervals
To construct a shield tunnel with a rectangular cross section
And the pair located in the long side direction of these shield tunnels
Dismantling the facing wall segment and excavating the ground
Communicating the shield tunnels with each other;
Fix one end of PC steel wire to segment of shield tunnel
And a concrete step inside the shield tunnel.
A step of casting a sheet and embedding the PC steel wire therein.
And after the concrete has hardened, between the shield tunnels
Tension the other end of the PC steel wire to the fixing body at the center of the
Fixing the tunnel.