JPH083315B2 - Shield excavator for branch tunnel excavation - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shield tunnel excavator for a branch tunnel, which can excavate a parallel tunnel such as a double-track subway by branching from a tunnel having a large cross section.

[0002]

2. Description of the Related Art Conventionally, in order to excavate a branch tunnel for laying a double-track railway from a wide space such as a tunnel of a subway station, first, a single shield parallel excavator is used for a predetermined interval by a single-line parallel shield construction method. After excavating the parallel tunnel, the wall surface of the excavated tunnel was lined with segments, and then steel pipe sheet piles were sequentially laid from one vertical shaft to the other vertical shaft in the ground between the opposing upper parts of these tunnel linings. While connecting the end faces to each other, a large number of them are driven to form the upper wall portion, and then the lining on the opposite side surface portions of both tunnels is removed, the space below the upper wall portion is excavated, and the station portion is formed at the excavated portion. Construct. Then, a single shield excavator is again excavated from both sides of the station section in a desired direction at a constant interval to construct a branch tunnel of a double-track railway communicating with the station section.

[0003]

However, according to the tunnel construction means as described above, when constructing a large cross-section tunnel such as a station section tunnel, after the parallel tunnels are excavated by the single line parallel shield construction method, both tunnels are excavated. Since the upper wall is formed between them, not only is it uneconomical as the construction cost rises due to the long construction period from the tunnel excavation to the construction of the station, etc., and the upper wall is Since it is formed by driving a large number of steel sheet piles into the ground, the work is complicated and inefficient, and it is difficult to form an accurate upper wall portion.

Further, the joining property between the tunnel linings on both sides and the both ends of the upper wall portion is poor, and there is a possibility that a problem may occur in terms of waterproofness. In addition, when a shield excavator is propelled from both sides of a large-section tunnel such as a station section to build a branch tunnel, the lining work of the large-section tunnel and the branch tunnel cannot be performed continuously and efficiently, There is a problem in terms of workability and accuracy. An object of the present invention is to provide a shield excavator for excavating a branch tunnel that can solve such problems.

[0005]

In order to achieve the above object, a shield excavator for excavating a branch tunnel according to the present invention is a flat excavator.
A circular shape at the center of the front opening between the plate-shaped upper and lower skin plates
The center cutter plate of the
Close to the top and bottom of the plate and on the inner surface of the upper and lower skin plates
A central shaft formed by arranging a cylinder shaft-shaped horizontal auxiliary cutter along
It is installed on both sides of the shield aircraft and this central shield aircraft.
Inner and outer double shield aircraft, and the inner and outer double seals
The outer shield body part of the aircraft
Larger in diameter than the space between the toe and integrated with the upper and lower skin plates
C-shaped skin plate and its C-shaped section
At the front end opening of the shaped skin plate
-Stack the front of the outer part of the cutter plate on the back of the opposite inner part.
It consists of a ring-shaped cutter arranged so that it twists
The inner shield body part of the outer double shield body has the above cross section.
Arranged back and forth in a C-shaped skin plate
Cylindrical skin plate and in front of this skin plate
It consists of a circular cutter plate rotatably arranged in the end opening.
And the circular cutter plate is more than the center cutter plate.
It has a large diameter and the inner circumference of the ring-shaped cutter
The circular cutter plate and ring
It is characterized in that it is detachably connected to the blade cutter .

[0006]

Operation: By excavating the central shield body and the inner and outer double shield bodies on both sides thereof integrally, a tunnel having a large cross section equal to the entire cross sectional shape of these body bodies is excavated.
After excavating a large-section tunnel of a desired length, the branch tunnel is excavated by independently propelling only the inner shield body part of the inner and outer double shield body parts on both sides. The lining of the branch tunnel, which is continuous with the lining of the large cross-section tunnel, is the tail part of the inner shield body part that is assembled inside the tail part of the outer shield body part when the inner shield body part starts from the outer shield body part. By continuing the lining assembled in step 3, the construction can be done easily and efficiently.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the present invention will be described with reference to the drawings. As shown in FIGS. 1 to 3, a shield excavator is equipped with inner and outer double shield machines 2, 2 on both sides of a central shield machine 1.
Have a structure in which they are installed in parallel. Central shield aircraft 1
Is a plate-shaped upper and lower skin plate 1a, 1b having a desired width and length, which are vertically opposed to each other with a desired interval, and a circular center cutter plate 3 is disposed at the center of the front end opening thereof. A cylindrical shaft-shaped horizontal auxiliary cutter 4 which is adjacent to the upper and lower sides of the center cutter plate 3 and has a large number of cutter bits 4a, 4a ... 4a provided on the outer peripheral surface along the inner surfaces of the skin plates 1a, 1b. 4 are provided.

The inner and outer double shield bodies 2, 2 are an outer shield body portion 5 which is integrated with the central shield body 1.
And an inner shield body portion 6 housed in the outer shield body portion 5 so as to be independently propellable forward. The outer shield body part 5 is provided on the inner peripheral side of the skin plate 5a having a C-shaped cross section, which has a diameter larger than the size between the upper and lower skin plates 1a and 1b of the central shield body 1 and has substantially the same length as the skin plate. Inner cylinder by the annular connecting member 7
A skin plate 5'having a constant thickness is formed by integrally connecting 5b, and a ring-shaped cutter 8 having a width substantially equal to the thickness of the skin plate 5'is rotated on the front end surface of the skin plate 5 '. It has a freely arranged structure.

On the other hand, the inner shield body 6 is slidably fitted with a cylindrical skin plate 6a on the inner peripheral surface of the skin plate 5'of the outer shield body 5, and the front end of the opening of the skin plate 6a is slidably fitted. A circular cutter plate 9 having a diameter larger than that of the cutter plate 3 of the central shield machine body 1 is rotatably disposed, and the outer peripheral surface of the cutter plate 9 is slidably contacted with the inner peripheral surface of the ring-shaped cutter 8. Have.

The skin plate 1a of the central shield body 1,
As shown in FIG. 4, both side edges of 1b are integrally fixed to the skin plates 5a of the outer shield machine bodies 5, 5 of the inner and outer double shield machine bodies 2, 2 on both sides, and the skin plates 1a, A jack mounting frame 10 having the same width as the rear end surface of the skin plate 5'of the outer shield body 5 is fixed to the inner surface of 1b, and both ends of the frame 10 are continuously connected to the skin plate 5 '. Rear end face and frame 10
11 are fixed and supported at predetermined intervals. Then, the rod ends of these propulsion jacks 11 are pressed against the front end surface of the segment lining S, and the extension of the propulsion jacks 11 advances the entire shield machine.

[0011] Further, the center cutter plate 3 Yes disposed rearwardly so as to overlap the sides inside the back of both sides of the ring-shaped mosquito jitter 8, the central axis 12 in the front end of the skin plate 6a It is rotatably penetrated and supported by a partition wall 13 fixed to the peripheral surface, and is rotationally driven by a drive motor 14 mounted on the back surface of the partition wall 13. Further, similarly, the circular cutter plate 9 of the inner shield body portion 6 also has a partition wall 15 whose rotary shaft cylinder 16 is fixed to the inner peripheral surface of the front end portion of the skin plate 6a.
Is rotatably supported by a drive motor 17 mounted on the back side of the partition wall 15.

The rotary shaft cylinder 16 has a plurality of support members 18 projecting from concentric circles on the outer peripheral surface of the rear surface of the circular cutter plate 9 and integrally fixed to the support members 18 and protruding rearward from the partition wall 15. Attach the external gear 19 to the outer peripheral surface of the
The small gear 20 fixed to the rotary shaft of the drive motor 17 is meshed with the drive motor 17, and the drive motor 17 is supported by an outer bracket 21 fixed to the inner peripheral surface of the skin plate 6a and the outer bracket 21 The inner brackets 22 are provided at a plurality of locations on the inner peripheral surface, and the central portion of the partition wall 15 is fixed and supported by these brackets 22. However, instead of the rotary shaft cylinder 16, the center shaft is used as the center cutter plate 3. You may comprise in the same structure.

Reference numeral 23 designates a earth and sand intake chamber formed between the back surface of the center carter plate 3 and the partition wall 13, and 24 denotes a earth and sand intake chamber formed between the rear surface of the large-diameter circular cutter plate 9 and the partition wall 15. , The skin plates from inside the tunnel to these chambers 23 and 24 respectively
6a, 6a and through the space between the upper and lower skin plates 1a, 1b, the tip opening of the feed and sludge pipes 25, 26 are separated by the partition wall 1
It penetrates through 3 and 15 and these feed and sludge pipes 2
The mud is recirculated between 5, 26 and the earth and sand separation tank (not shown) installed on the ground to discharge the earth and sand excavated to the ground.

Further, as shown in FIG. 6, jacks 27 are provided at a plurality of places on the back surface of the circular cutter plate 9 of the inner shield body portion 6.
Mounted on the circular cutter plate 9 so that the rod 28 projects from the peripheral wall of the circular cutter plate 9 so that the rod end can be inserted into the locking hole 29 formed on the inner peripheral surface of the ring-shaped cutter 8 of the outer shield body 5. The ring-shaped cutter 8 and the circular cutter plate 9 are detachably connected to each other by engagingly and disengageably locking . As is well known, the circular cutter plate 9 and the center cutter plate 3 are provided with earth and sand intake slits 30 in a radial manner, and a large number of cutter bits 31 are projected along the slits 30.

Further, an annular bracket 32 is provided around the inner peripheral surface of the rear end of the skin plate 6a of the inner shield body 6.
As shown in FIGS. 4 and 6, a plurality of branch shield jacks 33 are mounted, and stopper members are provided at a plurality of inner peripheral surfaces of the rear end of the skin plate 5 ′ of the outer shield body part 5.
34 is projected and the rear end of the inner shield body 6 is received by the front end face thereof, and it can be integrally propelled as the inner and outer double shield body 2 when excavating a large cross section tunnel.

Numerals 35 and 36 are erectors respectively arranged in the tail portions of the central shield body 1 and the inner / outer double shield body 2. The upper and lower skin plates of the central shield body 1
As shown in FIG. 5, the horizontal auxiliary cutters 4 and 4 arranged along the inner surfaces of 1a and 1b are opposed to the skin plates 5'and 5'of the outer shield body 5 with the shafts of both ends thereof opposed to each other. The surface is rotatably supported, and is rotationally driven by a drive motor (not shown) arranged in the skin plate 5 '.

With this structure, when the drive motor 14 is driven, the center cutter plate 3 rotates, and the upper and lower horizontal auxiliary cutters 4 and 4 are also rotated by the drive motor, and the inner and outer double shield machine bodies 2 on both sides are rotated. The large-diameter circular cutter 9 of the inner shield body 6 in 2 is rotated by driving the drive motor 17, and the cutter 9 and the jack 27 are rotated.
Outer shield fuselage 5 connected via rod 28 of
The ring-shaped cutter 8 is integrally rotated.

On the other hand, the skins of the inner and outer double shield machines 2, 2 connected to the inner surfaces of the upper and lower skin plates 1a, 1b of the central shield machine 1 and both ends of the inner surface using the erectors 35, 36 in the tail portion of the skin plate. Inner tube in plate 5 '
By assembling the segment S along the inner surface of the skin plate 5a protruding appropriately from 5b, the rod end of the propulsion jack 11 is received by the front end surface of the segment lining S, and the propulsion jack 11 is extended, The shield excavator advances and the large-diameter circular cutter plates 9 of the inner and outer double shield machines 2, 2 on both sides and a ring-shaped cutter 8 that rotates integrally with the cutters.
Thus, the circular parallel tunnel portions T, T are excavated.

At the same time, the ground between the inner and outer double shield bodies 2, 2 is excavated by the center cutter plate 3 and the upper and lower horizontal auxiliary cutters 4, 4 of the center shield body 1,
A large-section tunnel having a central space portion in which the tunnel portions T are connected to each other is excavated.

The excavated soil is taken in by the intake chamber 23 on the rear side of the cutter plate.
It is taken into the inside of 24 and is discharged to the sediment separation tank installed on the ground through the tunnel by the muddy water flowing back through the mud pipes 25 and 26. When the shield excavator as a whole is excavated for a certain length by the operation of the propulsion jack 11, the propulsion jack 11 is contracted, and then a plurality of segments are assembled in the tail portion in the circumferential direction along the tunnel inner wall surface as described above. By repeating this operation every time the excavation of the entire apparatus is carried out for a certain length, the tunnel having the large cross-sectional shape is constructed for a desired length, and after the segment lining S is constructed, the secondary lining and partition walls, pillars, etc. It will be built to form a station section with a double-track subway.

In this way, when a large-section tunnel covered with a predetermined length of a station or the like is built and then a branch tunnel is formed from both sides of the front end of this tunnel, first, the center cutter of the central shield machine body 1 The driving of the plate 3 and the upper and lower horizontal auxiliary cutters 4 and 4 is stopped, and at the same time, the rod 28 of the jack 27 provided on the circular cutter plate 9 of the inner shield body 6 is contracted to lock the hole 29 of the ring-shaped cutter 8. Disengage from.

Further, as shown in FIG. 7, at the rear end of the skin plate 6a of the inner shield body 6, a tubular tail portion 6b of appropriate length having a seal 37 on the inner peripheral surface of the rear end is added. At the same time, the opening ends of the juxtaposed tunnels T, T are circularly segment-covered, and an intermediate segment lining Sa is formed on the front end surface of the tunnel T, the thickness of which is increased toward the inner peripheral surface. A small diameter segment lining Sb is assembled in the tail portion 6b on the front end surface of Sa.

After that, the circular cutter plate 9 of the inner shield body portion 6 of the inner and outer double shield body 2 is rotated, and the rod end of the branch shield jack 33 is received by the front end surface of the segment lining Sb. When 33 is extended, the inner shield body parts 6 and 6 advance so as to come out of the outer shield body part 5, and the ground in front of them is dug.

The excavated earth and sand is taken into the earth and sand intake chamber 24 on the back side of the circular cutter plate 9, and is discharged to the earth and sand separation tank installed on the ground through the tunnel by the mud water flowing back through the mud pipes 25 and 26. In this way, when a tunnel of a certain length is excavated, the jack 33 is contracted, and then a plurality of segments are assembled in the tail portion 6b in the circumferential direction along the inner wall surface of the tunnel. The branch tunnels Ta, Ta having a desired length are constructed by repeating the above steps.

The present invention is not limited to the sealed shield machine using the above-mentioned muddy water recirculation type earth and sand discharging means, but can also be applied to a shield machine including a screw conveyor and other suitable earth and sand discharging means. Needless to say, it can be adopted, and in addition to arranging the inner and outer double shield aircrafts 2 and 2 side by side, it is also possible to construct a subway by arranging them in the vertical direction. It can also be used to build underground roads and parts of underground malls.

[0026]

As described above, according to the shield excavator for branch tunnel excavation of the present invention, the central shield body and
Inner and outer double shields arranged on both sides of the central shield body
Because it consists of a fuselage, by excavating these central shield aircraft and inner and outer double shield aircraft integrally,
A tunnel with a large cross section that is equivalent to the entire cross section of these aircraft
Of course it is possible to drilling, the central shield excavator
Is the center of the front end opening between the flat plate-shaped upper and lower skin plates
A circular center cutter plate is installed on the
Close to the top and bottom of the cutter plate and
Since a cylindrical shaft-shaped horizontal auxiliary cutter is arranged along the inner surface, a part of the tunnel along the inner peripheral surface of the flat plate-shaped upper and lower skin plates can be accurately measured by the upper and lower horizontal auxiliary cutters. The ground between these upper and lower horizontal auxiliary cutters can be excavated by the center cutter plate to form a tunnel portion having a rectangular central portion.

Furthermore, it is arranged on both sides of the central shield body.
The outer shield body part of the inner and outer double shield body is
Larger diameter than the size between the upper and lower skin plates
Skin plate with a C-shaped cross section
And the front end opening of this C-shaped skin plate
At the front of the outer side of the center cutter plate.
Ring-shaped brackets arranged so that the back of the inner part overlaps.
The inner shield machine of the inner and outer double shield aircraft
The body moves back and forth inside the C-shaped skin plate.
The cylindrical skin plate installed at
A circular cover rotatably arranged in the front end opening of the control plate.
A circular cutter plate, and the circular cutter plate is
The ring has a larger diameter than the cutter plate
The outer peripheral surface of the circular cutter slidably contacts the inner peripheral surface of this circular cutter.
The cutter plate and the ring-shaped cutter are detachably connected.
Therefore, the state that the circular cutter plate and the ring-shaped cutter are connected
By rotating the circular cutter plate with
The upper and lower skin plates of the flat plate shape rotate integrally with each other.
Efficiently excavating a tunnel with a diameter larger than the size between
In addition, part of the ring-shaped cutter
Since it overlaps on both sides of the front of the
Rectangle excavated by auxiliary cutter and center cutter plate
Secure the large diameter tunnel part on both sides of the central tunnel part
It is possible to excavate a large cross section tunnel while communicating.
It In addition, from the ring-shaped cutter on the outer shield body,
Continuously excavating a branch tunnel from both sides of the large section tunnel by separating the circular cutter plate of the side shield body part and independently propelling only these inner shield body parts respectively. And on top of this
The circular cutter plate is placed in front of the center cutter plate.
Since it is provided inside the ring-shaped cutter,
The outer diameter can be set to the desired dimension regardless of the diameter of the cutter plate,
Therefore, if the diameter is larger than that of the center cutter plate,
It is possible to excavate a branch tunnel.

[Brief description of drawings]

FIG. 1 is an overall perspective view showing a construction state,

FIG. 2 is a front view of the shield excavator,

FIG. 3 is a simplified sectional view thereof,

FIG. 4 is a sectional view of a portion where a propulsion jack is mounted,

FIG. 5 is a simplified vertical sectional front view,

FIG. 6 is a vertical sectional side view of the inner and outer double shield aircraft,

FIG. 7 is a vertical cross-sectional side view of the main part.

[Explanation of symbols] 1 center shield machine body 2 inner and outer double shield machine body 3 center cutter plate 4 horizontal auxiliary cutter 5 outer shield machine body part 6 inner shield machine body part 8 ring-shaped cutter 9 large diameter circular cutter 11 propulsion jack 33 branch shield jack

Claims (1)

[Claims] 1. A front end between flat upper and lower skin plates.
A circular center cutter plate is placed in the center of the opening and
The upper and lower skins which are close to the upper and lower sides of the center cutter plate
A cylindrical auxiliary horizontal cutter is placed along the inner surface of the plate.
The central shield aircraft that is installed and this central shield aircraft
Consists of inner and outer double shield aircraft arranged on both sides of
The outer shield body part of the inner and outer double shield body is
Larger diameter than the size between the upper and lower skin plates
Skin plate with a C-shaped cross section
And the front end opening of this C-shaped skin plate
At the front of the outer side of the center cutter plate.
Ring-shaped brackets arranged so that the back of the inner part overlaps.
The inner shield machine of the inner and outer double shield aircraft
The body moves back and forth inside the skin plate with the C-shaped cross section.
A cylindrical skin plate that is freely arranged and this
Circularly rotatably arranged in the front end opening of the Kinplate
A circular cutter plate, and the circular cutter plate is
-It has a larger diameter than the cutter plate,
The outer peripheral surface is slidably contacted with the inner peripheral surface of the cutter
The cutter plate and ring-shaped cutter are detachably connected.
Branch tunnel boring shield excavator, characterized in that that.