JP2001303885A - Underground joining method for tunnel and shield machine used therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily perform underground connecting work without attaching/ detaching a connecting member for stopping rolling and simplify the structure of the machine body of a shield machine. SOLUTION: An underground joining method for a tunnel is provided with the first, second, third, fourth, and fifth processes. In the first process, a front barrel 1 of a retracting-side shield machine A is fixed through the medium of a shield jack 18 to a segment 19 and a rear barrel 2, and bolts 15 fixing the barrels 1, 2 is removed. In the second process, the front barrel 1 is made to advance relative to the rear barrel 2 by a specified distance under the operation of the shield jack 18. In the third process, a hood part 21 mounted on front part of the front barrel 1 is pushed out forward relative to the front barrel 1 as far as the position to cover the outer periphery of a cutter head 5. In the fourth process, the front barrel 1 is slid rearward while pushing out the hood part 21 forward relative to the rear barrel 2 under the operation of the shield jack 18. In the fifth process, a cutter head of an inserting-side shield machine A is fitted into the inside of the front barrel 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention
The present invention relates to a tunnel underground joining method for excavating tunnels using two shield excavators and joining the tunnels halfway to complete the tunnels, and a shield excavator used therefor.

[0002]

2. Description of the Related Art Conventionally, a method described in Japanese Patent Publication No. 5-24319 is known as an underground joining method of a tunnel which joins tunnels excavated by two shield excavators in the middle. In the underground joining method described in this publication, a retractable shield excavator has a hood that can slide back and forth on the outer peripheral surface of an outer shell. The cutter head and the hood supported by the support structure are advanced in a state in which the cutter head is stopped, and then the hood is fixed and the bolts fixing the hood to the support structure are removed to support the cutter head. At the same time, it is retracted to form a compartment in the hood.

However, in the case of this underground joining method, since the hood cannot be operated alone, the outer digging portion of the cutter head cannot be covered with the hood.
When the support structure is retracted, there is a risk of collapse of the ground above the cutter head.

[0004] In order to solve such problems,
Japanese Patent No. 2915843 discloses an underground joining method in which the body of the shield machine is advanced to a position covering the outer periphery of the cutter head prior to sliding the drive ring gutter having the cutter head backward. Proposed.

As another prior art, Japanese Patent Application Laid-Open No.
There is one described in JP-A-292775. In the shield machine described in this publication, a penetrating ring is provided on the inner peripheral surface of the front part of the fuselage, and the penetrating ring is pushed forward by a shield jack to project forward of the fuselage.

[0006]

However, in the underground joining method described in Japanese Patent No. 2915843, since the ring gutter of the driving portion slides with respect to the front body, the driving portion has a structure in which the ring gutter slides normally. An extremely strong connecting member (rolling stop) between the drive ring gutter and the front body
And it takes time and effort to remove the connecting member at the time of underground joining.

On the other hand, the underground joining method disclosed in Japanese Patent Application Laid-Open No. 10-291775 has a problem that both the lead-in shield excavator and the insert-side shield excavator have complicated structures, and the draw-in shield. There is a problem that a space for accommodating the penetrating ring is required in the inner peripheral portion of the excavator, and the amount of overcut increases.

The present invention has been made in order to solve such a problem, and there is no need to attach / detach a connecting member for stopping rolling, so that the underground joining operation can be easily performed. It is an object of the present invention to provide a tunnel underground joining method capable of making the structure extremely simple and a shield machine used for the method.

[0009]

In order to achieve the above object, the underground joining method for a tunnel according to the first invention is characterized in that a front body having a cutter head at a front part slides with respect to a rear body. A tunnel is excavated by using a first shield excavator that is inserted as possible and a second shield excavator having a body part having substantially the same diameter as the front body of the first shield excavator, and each of these tunnels is excavated. A tunnel underground joining method that completes the tunnel by joining along the way,
(A) a first step of fixing the front trunk of the first shield machine to the segment and the rear trunk via a shield jack, and removing a fixing member fixing the front trunk and the rear trunk, ( b) a second step of advancing the front body by a predetermined distance with respect to the rear body by operating the shield jack; (c) setting a hood portion provided at a front portion of the front body with respect to the front body by the cutter head; A third step of pushing the hood portion forward to a position covering the outer periphery of the third body, (d) a fourth step of sliding the front body backward with respect to the rear body by operating the shield jack while pushing the hood portion forward; and e) inside the front fuselage of the first shield machine,
A fifth step of fitting the cutter head of the shield machine is provided.

In the underground joining method for a tunnel according to the present invention, when the first shield excavator and the second shield excavator are joined underground, first, in a first step, the front body of the first shield excavator mounts a shield jack. And the fixing members (eg, connecting bolts) fixing the front and rear bodies are removed so that the front body can move with respect to the rear body. You. Next, the second
In the process, the front body is advanced by a predetermined distance with respect to the rear body by the operation of the shield jack, and then, in the third step, the hood portion provided at the front portion of the front body extends to a position covering the outer periphery of the cutter head relative to the front body. It is pushed forward. Thereafter, in the fourth step, the front body is slid rearward with respect to the rear body by operating the shield jack while pushing the hood part forward, and the second shield excavation is moved into the front body of the first shield excavator. The receiving portion of the machine is secured, and in the fifth step, the cutter head of the second shield machine is fitted to the secured receiving portion. In this way, the underground joining of the tunnel is completed by stopping the water in the required portion.

According to the present invention, in the first shield machine, the hood portion provided at the front portion of the front fuselage is provided with respect to the front fuselage before the front fuselage is slid backward with respect to the rear fuselage. The cutter head is pushed forward to a position covering the outer periphery of the cutter head, so that collapse of the ground that occurs when the front body, in other words, the cutter head slides backward can be reliably prevented. In addition, a structure in which a slidable hood is provided on the front body is adopted, and the front body and the drive ring gutter are always fixed, so rolling between the front body and the drive ring gutter is performed. There is no need to provide a connecting member for stopping. Therefore, the work of attaching and detaching the connecting member becomes unnecessary, and not only the underground joining work becomes easy, but also the machine body can have an extremely simple structure.

Next, the shield machine according to the second invention is:
A front body having a cutter head at a front portion is slidably provided with respect to a rear body, and a hood portion slidable with respect to the front body is provided at a front portion of the front body. And the hood portion is configured to be slidable forward with respect to the front body by operating a hood portion sliding mechanism. It is.

The shield machine according to the present invention is a shield machine suitable for use as the first shield machine in the underground tunnel joining method according to the first invention. According to the present invention, the hood portion is provided at the front portion of the front body, and the hood portion is configured to slide forward with respect to the front body by operating the hood portion sliding mechanism. The collapse of the ground that occurs when the front trunk, in other words, the cutter head slides backward, can be reliably prevented. In addition, since the front body and the drive unit ring gutter are always fixed, there is no need to provide a connecting member for stopping rolling between the front body and the drive unit ring gutter. Therefore, the work of attaching and detaching the connecting member becomes unnecessary, and not only the underground joining work becomes easy, but also the machine body can have an extremely simple structure.

In the second invention, the convex portion provided on one of the front trunk and the rear trunk and extending in the front-rear direction is provided on the other side and the concave portion extending in the front-rear direction. It is preferable to adopt a configuration in which the relative rotation between the front trunk and the rear trunk is prevented by fitting into the third body (third invention). By adopting such a configuration, when the front trunk is advanced by a predetermined distance with respect to the rear trunk during the underground joining operation, the relative rotation between the front trunk and the rear trunk (with a very simple structure) Rolling) can be prevented. In addition, since the anti-rolling structure is formed by fitting the convex portion and the concave portion extending in the front-rear direction, there is an advantage that the present invention can be applied even when the forward stroke of the front body is large.

In the second invention or the third invention, it is preferable that the front body is divided into a first body part and a second body part in a front-rear manner via a center bending mechanism (a fourth invention). By doing so, when this shield excavator is used as a retractable shield excavator (first shield excavator) and is connected to the insertion side shield excavator underground, when the misalignment of both shield excavators occurs, The center folding mechanism can easily perform the centering, and can eliminate problems such as occurrence of a twisting phenomenon during underground joining.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A concrete embodiment of a tunnel underground joining method and a shield machine according to the present invention will be described with reference to the drawings.

FIG. 1 is a longitudinal sectional view of a shield machine (retracting-side shield machine) according to an embodiment of the present invention.

In the present embodiment, a retractable shield excavator (first shield excavator) A has an excavator main body divided into a front body (front shield) 1 and a rear body (rear shield) 2. The front part of the front body 1 has a stepped small diameter, and the drive ring gutter 3 is fixed to the inner peripheral part of the stepped part. A cutter head 5 is rotatably supported on the drive unit ring gutter 3 via a bearing 4, and the cutter head 5 controls a pinion and a ring gear by a hydraulic motor 6 mounted on the drive unit ring gutter 3. Is driven to rotate.

On the front plate of the cutter head 5, a center cutter 7 is provided at the center, and a number of cutter bits 8 are provided radially from the center to the periphery, and are located near the periphery. Are provided with a plurality of overcutter devices 9 so that they can protrude and retract from the outer peripheral edge of the cutter head 5.

A pressure chamber 11 is defined behind the cutter head 5 between the cutter head 5 and the bulkhead 10.
Is a mud pipe 12 for feeding muddy water into the pressure chamber 11.
And a mud discharge pipe 13 for discharging muddy water and excavated earth and sand sent by the mud feed pipe 12 in a mixed state are open. The mud feeding pipe 12 and the mud discharging pipe 13 are connected by a bypass pipe 14 at the rear.

The front body 1 is fitted to the front end of the rear body 2. During normal excavation, the rear end of the front body 1 and the front end of the rear body 2 are fixed to each other by a large number of bolts 15. ing.
As shown in FIG. 2 (cross-sectional view taken along line XX of FIG. 1),
The rear body 2 side is provided with a convex portion 16 extending in the front-rear direction, and the front body 1 side is provided with a concave portion 17 fitted to the convex portion 16. When the front trunk 1 moves forward with respect to the rear trunk 2, relative rotation (rolling) between the front trunk 1 and the rear trunk 2 is prevented.

Further, flange portions of a plurality of shield jacks 18 are fixed to the rear end of the front body 1, and the distal ends of the rods of the shield jacks 18 are brought into contact with the front end surfaces of the segments 19 to protrude from the rods. A spreader 20 for obtaining force is mounted.

A ring-shaped hood portion 21 is arranged on the outer peripheral portion of the stepped portion of the front body 1, and the outer peripheral surface of the hood portion 21 is substantially flush with the rear outer peripheral surface of the front body 1 during normal excavation. The front end face of the hood portion 21 is substantially flush with the front end face of the front body 1. This hood section 21
Are arranged so as to be slidable forward with respect to the front body 1 by operating a plurality of mini jacks 22 arranged along the inner peripheral surface of the front body 1.

Next, the hood sliding mechanism including the mini jack 22 will be described in more detail with reference to FIGS. A ring-shaped connecting rod 23 is connected to the rear end surface of the hood 21, and the connecting rod 23 is arranged so as to pass through a step (vertical portion) of the front body 1.
By pressing the rear end face of the connecting rod 23 with the mini jack 22, the hood portion 21 is connected via the connecting rod 23.
Is configured to move forward. Further, another connecting rod 23 is attached to the rear end of the connecting rod 23 by screwing, welding, or the like. 22 is contracted to form a gap behind the leading connecting rod 23, another connecting rod 23 is inserted into this gap to replenish, and the mini jack 22 is extended again to push out the connecting rod 23. You. In this way, a predetermined number of connecting rods 23 are sequentially added, and the hood portion 21 advances by a predetermined stroke.

On the other hand, as shown in FIG. 4, the insertion-side shield excavator (second shield excavator) B has a drive unit ring gutter 31 on the front inner peripheral surface of a straight-body type body 30. The drive ring gutter 3 is slidably inserted in the
1, the cutter head 33 is rotatably supported via a bearing 32. A plurality of overcutter devices 34 are provided at positions near the peripheral edge of the cutter head 33 so as to be able to protrude and retract from the outer peripheral edge of the cutter head 33. Further, the drive unit ring girder 31
Has one end pivotally attached to a rib on the body 30 side,
The other end is slid forward with respect to the body 30 by a slide jack 35 pivotally attached to the drive ring gutter 31. In addition, the detailed description of the configuration and the like other than those described above that are common to the retracting-side shield machine is omitted.

Next, a tunnel underground joining procedure according to the present embodiment will be described with reference to FIGS.

1) Underground joining procedure 1 (FIG. 5) The insertion-side shield excavator B reaches the joining point, and the retracting-side shield excavator A reaches a position a predetermined distance (for example, 700 mm) before the joining point. . In this state, the skin plate of the rear trunk 2 and the segment 19 of the retractable shield excavator A are fixed (the fixing portion 4).
0) together with the spreader 20 of the shield jack 18
And the segment 19 are fixed (fixing portion 41).

2) Underground joining procedure 2 (FIG. 6) The bolt 15 fixing the front trunk 1 and the rear trunk 2 of the retractable shield excavator A is removed. On the other hand, in the insertion-side shield machine B, the overcutter device 34 of the cutter head 33 is reduced inward.

3) Underground joining procedure 3 (FIG. 7) In the retracting side shield excavator A, the cutter body 5 is rotated while the shield jack 18 is extended, so that the front body 1 is moved to the rear body 2 by the predetermined distance. (For example, 7
00 mm) (arrow P). When the retracting shield excavator A excavates, the insertion shield excavator B is in a standby state. When the retreat-side shield excavator A excavates, the protrusion 16 on the rear trunk 2 side is
By being fitted in the concave portion 17 on the side, relative rotation (rolling) between the front body 1 and the rear body 2 is prevented.

4) Underground joining procedure 4 (FIG. 8) After the overcutter device 9 in the retracting shield excavator A is reduced, the connecting rod 23 is successively added to the rear end of the hood section 21 and the hood section 21 is added. And the front end face of the hood portion 21 is
Until it is flush with the face plate (approximately 300 m in this embodiment).
m) Move forward (arrow Q).

5) Underground joining procedure 5 (FIG. 9) At the same time, the front body 1 is retracted from the rear body 2 by the predetermined distance (for example, 700 mm) by contracting the shield jack 18 of the retractable shield machine A. Then, the hood 21 is advanced by the predetermined distance (for example, 700 mm). As a result, the hood portion 21 is retracted by the predetermined distance only in the front body 1, in other words, the cutter head 5, while maintaining the position, so that the insertion-side shield excavator B is received in front of the cutter head 5. Is formed. Here, in the case of a soft ground or a ground with a lot of groundwater, for example, high-concentration muddy water is injected into the space in front of the cutter head 5 at the same time as the cutter head 5 is pulled in, and the earth and sand are filled in the space. It is preferable not to enter.

6) Underground joining procedure 6 (FIG. 10) In the insertion side shield excavator B, the shield jack 18A is extended while rotating the cutter head 33 while the retracting side shield excavator A is on standby. A part of the outer peripheral ring of the head 33 is inserted into the hood 21 of the retractable shield excavator A, and then the slide jack 35 is extended to push out the drive ring gutter 31 (arrow R). As a result, the cutter heads 5, 33 of the shield excavators A, B are brought into the closest state.

7) Underground joining procedure 7 (FIG. 11) Each member is removed except for the respective skin plates of the lead-in shield excavator A and the insert-side shield excavator B, and the necessary parts (welds 42 to 49) are removed. ) Is welded to complete the underground joining.

FIG. 12 shows a retracting shield machine according to another embodiment of the present invention, and FIG. 13 shows an insertion shield machine according to another embodiment.

In the retractable shield excavator A 'of this embodiment, the front body 1' is divided into a first body 51 at the front and a second body 52 at the rear via the folding mechanism 50. The first body 51 and the second body 52 are bendable by the expansion and contraction of the articulate jack 53. Other configurations and the like are basically the same as those of the previous embodiment. Therefore, the same reference numerals are given to the same parts as those in the above embodiment, and the detailed description thereof will be omitted.

Such a retractable shield excavator A '
According to the above structure, the front trunk 1 ′ and the rear trunk 2 are integrally excavated at the time of normal excavation and when the front trunk 1 ′ is advanced with respect to the rear trunk 2 at the time of underground joining with respect to the second trunk 52. First trunk 5
1 can be controlled, so that both shield excavators can be easily aligned at the time of underground joining, and problems such as occurrence of a twisting phenomenon at the time of underground joining can be eliminated. .

On the other hand, also in the insertion-side shield excavator B ', the trunk 30' is divided into a first trunk 61 at the front and a second trunk 62 at the rear via the folding mechanism 60. The first body 61 and the second body 62 are bendable by the expansion and contraction of the articulated jack 63. Also,
During normal excavation, the first trunk portion 61 and the driving portion ring gutter 31
Are fixed to each other by bolts 64 or the like.

In the insertion-side shield excavator B 'having such a configuration, it is possible to perform curved construction by controlling the traveling direction of the first trunk portion 61 with respect to the second trunk portion 62 during normal excavation. Further, at the time of underground joining, the fixed state of the first trunk section 61 and the drive section ring gutter 31 with the bolt 64 or the like is released, and the bent section between the first trunk section 61 and the second trunk section 62 is fixed. Then, the drive unit ring gutter 31 is advanced with respect to the first body 61 and the second body 62. In addition,
The advancement of the drive ring gutter 31 can be performed using the articulated jack 63.

In the above description, the mechanism using the mini jack 22 and the connecting rod 23 has been described as the hood sliding mechanism. However, as another form of the hood sliding mechanism, FIG. As shown in b), the hood portion 21 'is formed in a substantially crank shape in cross section, and the rear portion of the hood portion 21' is provided with a hydraulic chamber 7 provided on the front body 1A side.
0, and a seal member 71 is interposed between the rear end of the hood 21 'and the inner wall of the hydraulic chamber 70, and hydraulic pressure is supplied from the pipe 72 into the hydraulic chamber 70. Embodiments are also possible. In such a configuration, the pipe 72 is moved from the state shown in FIG.
When the hydraulic pressure is supplied into the hydraulic chamber 70 through the hood portion 21 ', the hood portion 21' can be moved to a predetermined position in the forward direction as shown in FIG.

In the above description, as a rolling prevention mechanism for preventing relative rotation (rolling) between the front body and the rear body, the projection 16 on the rear body side and the concave portion 17 on the front body side are fitted. However, an embodiment is also possible in which a concave portion is provided on the rear trunk side and a convex portion is provided on the front trunk side, and the concave portion and the convex portion are fitted.

In this embodiment, a muddy shield machine has been described. However, it is needless to say that the present invention can be applied to a mud pressure shield machine.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a shield machine (retracting-side shield machine) according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line XX of FIG. 1;

FIGS. 3A and 3B are enlarged cross-sectional views showing an operation mode of a hood unit.

FIG. 4 is a longitudinal sectional view of a shield machine (insertion side shield machine) according to one embodiment of the present invention.

FIG. 5 is a diagram showing a tunnel underground joining procedure (1).

FIG. 6 is a diagram showing a tunnel underground joining procedure (2).

FIG. 7 is a diagram showing a tunnel underground joining procedure (3).

FIG. 8 is a diagram showing a tunnel underground joining procedure (4).

FIG. 9 is a diagram showing a tunnel underground joining procedure (5).

FIG. 10 is a diagram showing a tunnel underground joining procedure (6).

FIG. 11 is a diagram showing a tunnel underground joining procedure (7).

FIG. 12 is a longitudinal sectional view of a retractable shield excavator according to another embodiment.

FIG. 13 is a longitudinal sectional view of an insertion-side shield machine according to another embodiment.

FIGS. 14A and 14B are views showing another embodiment of the hood sliding mechanism.

[Explanation of Signs] A, A 'Retracting-side shield excavator (first shield excavator) B, B' Insertion-side shield excavator (second shield excavator) 1, 1 ', 1A Front trunk 2 Rear trunk 3, DESCRIPTION OF SYMBOLS 31 Drive part ring gutter 5, 33 Cutter head 9, 34 Overcutter device 15 Bolt 16 Convex part 17 Concave part 18, 18A Shield jack 19 Segment 20 Spreader 21, 21 'Hood part 22 Bean jack 23 Connecting rod 30, 30' Body 35 Slide jacks 40, 41 Fixed parts 50, 60 Folding mechanism 51, 61 First body part 52, 62 Second body part 53, 63 Articulated jack 70 Hydraulic chamber

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Masaki Muranishi 5 Yokaichi Town, Komatsu City, Ishikawa Prefecture Inside the Komatsu Plant, Ltd. (72) Inventor Norio Mitani 2-3-6 Akasaka, Minato-ku, Tokyo, Ltd. Komatsu Ltd. Head Office F-term (reference) 2D054 AA04 AC04 AC05 AD02 AD13 BA03 EA09

Claims (4)

[Claims] 1. A first shield excavator in which a front trunk having a cutter head at a front portion is slidably fitted to a rear trunk, and a trunk having substantially the same diameter as the front trunk of the first shield excavator. A tunnel underground joining method for excavating tunnels using a second shield excavator having a portion and joining each of these tunnels on the way to complete the tunnel,
(A) a first step of fixing the front trunk of the first shield machine to the segment and the rear trunk via a shield jack, and removing a fixing member fixing the front trunk and the rear trunk, ( b) a second step of advancing the front body by a predetermined distance with respect to the rear body by operating the shield jack; (c) setting a hood portion provided at a front portion of the front body with respect to the front body by the cutter head; A third step of pushing the hood portion forward to a position covering the outer periphery of the third body, (d) a fourth step of sliding the front body backward with respect to the rear body by operating the shield jack while pushing the hood portion forward; and e) inside the front fuselage of the first shield machine,
A tunnel underground joining method, comprising a fifth step of fitting a cutter head of a shield machine. 2. A front body having a cutter head at a front part is slidably provided with respect to a rear body, and a hood part slidable with respect to the front body is provided at a front part of the front body. The front body can be slid in the front-rear direction with respect to the rear body by operating a shield jack, and the hood can be slid forward with respect to the front body by operating a hood part sliding mechanism. A shield machine. 3. A protrusion provided on one side of the front trunk and the rear trunk and extending in the front-rear direction is fitted into a recess provided on the other side and extending in the front-rear direction. so,
The shield machine according to claim 2, wherein relative rotation between the front trunk and the rear trunk is prevented. 4. The shield machine according to claim 2, wherein the front body is divided into a first body part and a second body part in a front-rear manner via a center bending mechanism.