JPH1162467A - Cutter head of shield excavator for underground docking - Google Patents

Abstract

(57) [Abstract] [Problem] To eliminate the remaining of a cutter ring on the outer periphery of a tunnel, which may hinder penetration of a penetration ring. A cutter ring is detachably divided into a plurality of parts in a circumferential direction at a mounting portion of an extendable support spoke, and each split ring is fixed to an extendable main spoke. And shrinking at a different time, the adjacent split ring 24
The diameter is reduced toward the shield axis to avoid interference with the shield a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutter head of an underground docking shield excavator for docking two shield excavators which excavate from two shafts facing each other to connect a tunnel. .

[0002]

2. Description of the Related Art Conventionally, a shield method has been regarded as important in the construction of an underground tunnel excavated mainly in a metropolitan area, but a starting shaft for inserting a shield excavator and removing a shield excavator are required. It is becoming difficult to secure a reaching shaft, and in such an urban area or under the seabed with a long excavation distance, an underground joining method of docking a shield excavator on the way to connect a tunnel is being adopted. In this underground joining method, a mechanical shield docking method (MSD method), which mechanically joins shield excavators, has been developed in place of the freezing method, which requires soil improvement due to the long construction period and the rising and sinking of the ground. ing.

In this MSD method, as shown in FIG. 9, two shield excavators 51A, 51 excavated from both sides.
B is stopped immediately before the cutter heads 52A and 52B come into contact with each other. Then, after reducing the diameter of each of the cutter heads 52A and 52B, the penetration ring 53 built in the outer periphery of the distal end portion of one of the shield main bodies 51a is made to protrude, and the other shield main body 5a is protruded.
1b. further,
After the shield excavators 51A and 51B are dismantled and removed while leaving the joint and the outer peripheral skin plate, concrete is cast and secondary lining is performed.

[0004]

By the way, the cutter heads 52A, 52B which can be reduced in diameter have spokes 52a, 5B.
Cutterings (or cutter outer peripheral plates) 52b, 52b are mounted on the outer periphery of the tip of 2a for the purpose of preventing the face from collapsing. When the diameter is reduced, the cutter rings 52b, 52b are separated from the spokes 52a, 52a, and are cut off. And the penetrating ring 53 is connected to the cutter rings 52b, 52b.
It is protruded through the inside. For this reason, if the cutter is misaligned when the spokes are contracted, this cutter 5
There is a possibility that the penetration ring 53 may not be able to protrude due to contact with the penetration rings 2b and 52b.

An object of the present invention is to provide a cutter head of a shield excavator for underground docking having a structure which does not hinder the penetration of a penetration ring. I do.

[0006]

In order to achieve the above object, according to the first aspect of the present invention, two shield excavators which excavate from both sides in opposition to each other are provided at a position before the cutter head comes in contact with the two excavators. After stopping and reducing the diameter of the cutter heads of both shield excavators, the penetrating ring built in the outer periphery of the front part of one shield body was protruded, and the tip was formed on the shield body of the other shield excavator. A cutter head of an underground docking shield excavator that reaches the penetration room and connects two shield excavators and connects the tunnel, and a plurality of spokes extending from the shield axis at fixed angles to the cutter head. In addition to the above, a spoke extension device for extending and retracting each spoke in the length direction is provided, and a cutter ring is provided at the tip of the spoke over the entire circumference. In both cases, the cutter ring is composed of a plurality of split rings which can be connected and separated freely and each is fixed to one spoke, and the split rings are fixed and the adjacent spokes are fixed so that the split ring following the spoke does not interfere. The spoke expansion device is configured to be driven to expand and contract with a time delay.

According to the above construction, the cutter ring is divided into a plurality of parts so as to follow the retreat of the spokes, so that the diameter of the cutter head is reduced. Nothing. Therefore, there is no hindrance when the penetrating ring projects, and a large strength can be added to the spokes of the cutter head by the cutter ring, thereby enabling efficient excavation.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a docking shield machine according to the present invention will be described with reference to FIGS.

[0009] The two shield excavators 1A and 1B are mechanically shielded for excavating from two starting shafts facing each other and docking underground to connect a tunnel.
The docking method is to be implemented.
A first shield excavator 1A having a penetrating ring 2 connecting A and 1B and its penetrating device, and a second shield excavator 1B having a penetrating chamber 3 for receiving the tip of the penetrating ring 2 are provided.

The shield excavators 1A and 1B have the same configuration except for the penetrating ring 2, the penetrating device and the penetrating chamber 3, and the same members are denoted by the same reference numerals and description thereof is omitted. At the front of the cylindrical shield body 11, a pressure bulkhead 12 for holding the face collapse earth pressure is formed, and at the axial center of the pressure bulkhead 12, a bearing 13 is provided.
The cutter drive shaft 14 is rotatably supported on the shield axis O via the. A cutter head 15 for excavating the ground is provided at a front end of the cutter drive shaft 14, and a cutter drive motor 16 a is provided at a rear end of the pressure bulkhead 12.
And a cutter driving device 16 that rotates the cutter driving shaft 14 via a plurality of gears 16b and 16c. In addition. Although not shown, these shield excavators 1A,
1B is configured as a muddy shield in which a mud pipe and a drain pipe are connected to the pressure bulkhead 12, or an earth pressure shield to which a screw conveyor for discharging excavated sediment while maintaining pressure is connected.

As shown in FIGS. 1 and 2, the cutter head 15 is provided with a central member 21 mounted on the cutter drive shaft 14.
And four main spokes 22 around the shield axis O.
Are provided at every 90 °, and support spokes 23 are provided at positions 45 ° apart from each other between the main spokes 22, and a cutter ring 24 is provided on the outer peripheral portions of these main spokes 22 and the support spokes 23.

Main spokes 22 and support spokes 2
As shown in FIG. 4 to FIG. 6, spoke extension / contraction cylinders 25A and 25B, which are spoke extension / contraction devices, respectively, are built in and are configured to extend and contract within a predetermined range. That is, the main spokes 22 and the support spokes 23 are composed of guide cylinders 22a, 23a fixed to the center member 21 and cylinder tubes 22b of spoke telescopic cylinders 25A, 25B slidably fitted to the guide cylinders 22a, 23a. 23b, and the tip ends are guide cylinders 22a, 23a.
And the piston rods 22d and 23d fixed to the center fixing members 22c and 23c. A number of cutter bits (not shown) are attached to the face plate 29 and the spokes 22 and 23 attached to the guide cylinder 23a.

The cutter ring 24 includes four split rings 24a that can be split at corresponding positions of the support spokes 23.
And a ring fixing member 26 provided at the outer end of the cylinder tube 25a of the main spoke 22.
The center of the split ring 24a is fixed. Further, the support spoke 23 is connected to a ring connecting member 27 provided at an outer end of the cylinder tube 23b via a connecting means 28. The connecting means 28 can support loads in the circumferential direction and the forward direction, and can be easily separated in the radial direction. For example, as shown in FIG. To form a locking recess 28a,
A T-shaped fitting portion 28b in front view that can be fitted into the mounting recess 28a is formed at the end of the split ring 24, and the spoke retractable cylinder 25B is contracted to release the locking recess 28a from the fitting portion 28b. Can be done.

As shown in FIG. 3, an inner peripheral plate 31 is attached to a distal end inner peripheral portion of the shield main body 2 of the first shield machine 1A with a predetermined space left in a skin plate 2a, and a penetrating ring 2 is provided. Is formed in a storage chamber 32 for storing the. A projection 32a of the penetration ring 2 is formed at the front of the storage chamber 32, and a penetration jack 33 as a penetration device is provided at a predetermined interval in the circumferential direction at the rear of the storage chamber 32.
Push rods 33a corresponding to these penetration jacks 33
Is formed. Further, a guide member 35 of an auxiliary rod 34 inserted between the pushing rod 33a and the rear end of the penetration ring 2 is located in the accommodation chamber 32, and a loading port 32c for the auxiliary rod 34 is formed in the inner peripheral plate 31. Have been.

At the tip of the shield body 11 of the second shield machine 1B, there is formed a pressure receiving chamber 42 having an inner peripheral plate 41 attached to the skin plate 11a with a predetermined space, and an open front surface. Ring 2 penetrating into the pressure receiving chamber 42
A pressure-receiving rubber ring 43 for receiving the distal end portion and a pressure-receiving piston 45 urged by a spring 44 are provided.

In the above configuration, when connecting a tunnel during excavation, two shield excavators 1A and 1B are connected to each other.
It stops just before the cutter head 15 contacts. First, as shown in FIG. 5, the spoke extendable cylinder 25B of the support spoke 23 is contracted to retract the ring connecting member 27 toward the shield axis O, and the fitting portion 2 of the split ring 24a is
8b, the support spokes 23 and the cutter ring 24 are separated from each other.
4 is divided into four split rings 24a.

Next, the diameters of the cutter heads 15, 15 of the shield excavators 1A, 1B are reduced. That is, as shown in FIGS. 2 and 6, first, the spoke extension cylinder 25A of the other main spokes 22 (left and right in the drawing) is contracted,
First, every other split ring 24a is moved to a predetermined stroke S1.
Then, the spoke extendable cylinder 25A of the remaining main spokes 22 (up and down in the figure) is contracted, and the remaining split ring 24a is retracted by a stroke S2 smaller than S1, thereby reducing the diameter of the cutter head 15. At this time, since each split ring 24a is moved backward every other, the cutter head 1 does not contact the other split rings 24a.
5 can be smoothly reduced in diameter.

Next, the penetration jacks 33 of the first shield machine 1A are synchronously driven to project the penetration ring 2, and the leading end of the penetration ring 2 reaches the pressure receiving chamber 42 of the second shield machine 1B. At this time, the penetration jack 33
The auxiliary rod 34 is sequentially loaded between the rear end portion of the penetrating ring 2 (the already loaded auxiliary rod 34) and the push rod 33a at the time of retreat.

Further, the first and second shield excavators 1A,
1B, the constituent members excluding the housing chamber 32, the penetrating ring 2, and the pressure receiving chamber 42, such as the segment assembling apparatus, the pressure bulkhead 12, and the cutter head 15, are dismantled and removed, and concrete is cast and the secondary covering is performed. The tunnels excavated by the first and second shield excavators 1A and 1B are connected.

According to the above embodiment, the cutter head 1
Cutters 24 provided on the spokes 22 and 23
Is divided and the cutter head 15 is retracted following the contraction of the main spoke 22 to reduce the diameter of the cutter head 15.
3 can have a sufficient strength, and does not remain separated from the cutter head 15 when the diameter is reduced unlike the related art. Further, the cutter 24 can be reused.

In the above embodiment, the four main spokes 2
Two and four support spokes 23 are provided with four split rings 24a to form a cutter ring 24. However, five main spokes and five support spokes are provided with five split rings to perform cutting. And, of course, six or more split rings can be provided.

Further, as shown in FIG.
It is also possible to provide a connecting member 50 that can be manually or automatically connected and detached at both ends of a to eliminate the support spoke.

[0023]

As described above, according to the first aspect of the present invention, the cutter ring is divided into a plurality of parts so as to follow the retreat of the spokes, and the diameter of the cutter head is reduced. As it is not left on the outer periphery of the penetration ring at the time of connection as in the past, there is no obstacle when the penetration ring protrudes, and the spoke has a large strength because the outer end is connected by cutting. Efficient excavation can be performed with the addition.

According to the second aspect of the present invention, since the divided portions of the cutter ring are connected by the support spokes, the strength of the divided portions can be increased, and separation at the time of reducing the diameter of the cutter head can be easily performed. it can.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of a cutter head of a shield machine according to the present invention.

FIG. 2 is a front view when the diameter of the cutter head is reduced.

FIG. 3 is a vertical cross-sectional view showing the shield machine when docked.

FIG. 4 is a partial front sectional view when the diameter of the cutter head is enlarged.

FIG. 5 is a partial front sectional view showing a procedure for reducing the diameter of the cutter head.

FIG. 6 is a partial front sectional view when the diameter of the cutter head is reduced.

FIG. 7 is a front view of a ring connecting member of the cutter head.

FIG. 8 is a front view of a cutter head according to another embodiment when the diameter of the cutter head is reduced.

FIG. 9 is a vertical cross-sectional view showing a conventional shield machine when docked.

[Explanation of symbols]

 Reference Signs List 1A First shield excavator 1B Second shield excavator 2 Penetration ring 3 Penetration chamber 15 Cutter head 21 Central member 22 Main spoke 23 Support spoke 24 Cutter ring 24a Split ring 25A, 25B Spoke telescopic cylinder 26 Ring fixing member 27 Ring connecting member 28 Connecting Means 28a Locking Recess 28b Fitting Part 32 Storage Room 33 Penetrating Jack

Claims (2)

[Claims] A shield machine which excavates from both sides facing each other is stopped at a position just before the cutter head comes into contact with each other. The underground connecting the tunnel by docking the two shield excavators by projecting the penetrating ring built in the outer periphery and reaching the tip end to the penetration chamber formed in the shield body of the other shield excavator A cutter head of a docking shield excavator, wherein a plurality of spokes extending from the shield axis at predetermined angles are provided on the cutter head, and a spoke extension device is provided to extend and retract each spoke in the length direction. At the tip, a cutter ring is provided over the entire circumference, and this cutter ring can be connected and separated freely and each has one spoke. The split ring is fixed, and the spoke extension device of the adjacent spoke is configured to be extended and retracted with a staggered time so that the split ring that follows the spoke does not interfere. Features cutter head of shield excavator for underground docking. 2. The spoke comprises a main spoke to which a split ring is fixed, and a support spoke disposed between the main spokes. 2. A cutter head for a shield excavator for underground docking according to claim 1, further comprising a ring connecting member having an engaging portion detached from an end portion to separate the cutter ring.