JPH0684716B2 - Underground shield shield machine - Google Patents

Description

Description: [Industrial field of use] The present invention relates to a shield machine for underground bonding for connecting a side tunnel to an existing tunnel.

[Prior Art] It is generally necessary to connect a side tunnel for laying an underground cable or the like to a railway or vehicle tunnel.

Conventionally, as shown in FIG. 7, since the side tunnel a is also excavated by the shield machine b, when the side tunnel a is connected to the main tunnel c, the shield machine b is stopped immediately before the side part of the main tunnel c. Then, after removing the cutter frame d and the like, the worker goes out to the front part of the shield machine b and excavates the earth and sand of the remaining connection part e.

At this time, in order to prevent the landslide caused by removing the cutter frame d, conventionally, a method of injecting a ground hardening agent such as cement milk into the ground mainly above the connection part e and above the ground has been adopted.

[Problems to be Solved by the Invention] However, in such a ground strengthening method using a ground hardening agent, the effect of the ground hardening agent is questionable in the case of a sandy ground or a ground with a lot of groundwater. There is a lot of traffic at the intersection, and the ground is likely to collapse due to frequent vibrations.

Therefore, the safety of the connecting work of the connecting portion e of the main tunnel c and the side tunnel a is not sufficient, and there is a possibility that a personal injury may occur due to the collapse of the ground.

[Means for Solving Problems] The present invention has been made for the purpose of solving the above problems and enabling the work of connecting a main tunnel and a side tunnel to be performed safely. A shield type shield excavator that can be excavated while preventing the face from collapsing by shutting off has a cylindrical shape that is continuous in the circumferential direction on the outer circumference of the tip of the shield frame, and only when connecting to an existing tunnel. With a projecting docking hood, at the tip of the docking hood, when a shape-changing part that matches the outer shape of an existing tunnel to be joined is formed, a small diameter part is formed at the tip of the shield frame, The docking hood is fitted on the small diameter part so that the outer diameter of the docking hood is the same as the outer diameter of the shield frame, and at the tip of the docking hood. In the shield machine for underground bonding, a notch for accommodating the outermost peripheral bit when the docking hood is projected is formed in a portion of the cutter that interferes with the outermost peripheral bit. .

[Operation] Normal excavation is performed with the docking hood having the same outer diameter as the shield frame being pulled toward the shield frame side, and the docking hood is projected forward from the tip of the shield frame when connecting the main tunnel and side tunnels. The shape changing portion is brought into contact with the main tunnel to support at least the ground above the shield frame tip portion.

Embodiments Embodiments of the present invention will be described below with reference to the drawings.

1 to 6 show an embodiment of the present invention, which is an example of application to a sealed type shield machine such as a mud pressure type. In the figure, 1 is a shield frame, 2 and 2'constitute a cutter rotatably provided at the tip of the shield frame 1. A plurality of radially extending cutter wings, 3 is a cutter bit, 4 is a fish tail, 5 Is a partition, 6
Is a screw conveyor, and 7 is a main tunnel. A step 8 is provided in the vicinity of the tip of the shield frame 1 so that the tip has a slightly smaller diameter, and a cylindrical docking hood 10 is provided in the smaller diameter portion 9. It is fitted so that it can slide in close contact with. The outer diameter of the docking hood 10 is the same as the outer diameter of the shield frame 1.

A shape-changing portion 12 (hereinafter, referred to as a notch 12) such as a notch formed so as to be in close contact with the outer peripheral surface of the segment 11 of the existing main tunnel 7 is provided on the upper end side of the docking hood 10.

Further, a notch 13 is provided in the lower half on the tip side of the docking hood 10 so that the docking hood 10 does not interfere with the outermost peripheral bit 14 of the cutter wing 2 when the docking hood 10 projects most toward the tip side of the small diameter portion 9 of the shield frame 1. To

Here, the one cutter wing 2'which becomes the top side at the time of joining
The outermost bit 14 is not provided at the tip of the so that the cutter wing 2 ′ does not interfere with the top of the docking hood 10.

The small-diameter portion 9 of the shield frame 1 is provided with a plurality of elongated holes 15 (four in this embodiment) on the outer peripheral surface of the partition wall 5 in the vicinity of the rear portion thereof, and the bracket 16 is inserted through the elongated holes 15 to dock the bracket 16. The hood 10 is fixed to the inner peripheral surface by welding or the like, and when the bracket 16 is not fixed, the blind lid 17 is removably fixed to the inner peripheral surface of the small diameter portion 9 with screws or the like.

A hydraulic jack 18 is pivotally attached to the inner peripheral surface of the shield frame 1 behind each of the elongated holes 15 in the axial direction of the shield frame 1 via brackets 19 and 20 and a pin 21, and each hydraulic jack 18
Connect the tip of rod 22 to each bracket 16
And pin 24 for connection.

In the figure, reference numeral 25 denotes a spare long hole, which is closed by a removable blind lid 17 as in the above.

The operation of the present invention will be described below.

The shield machine is designed to excavate in the soil with a cutter 2 provided at the tip of the shield frame 1 and to propel it. Among them, the sealed shield machine has a partition wall 5 inside the shield frame 1. The partition wall 5 is provided to prevent the face from collapsing so that stable excavation can be performed at all times.

Therefore, in the case of excavating the normal side tunnel 26, it is not necessary to use a hood or the like to prevent the face from collapsing. Therefore, the docking hood 10 is pulled toward the rear end side of the small diameter portion 9 of the shield frame 1 and at least the docking is performed. Hood 10
Outermost bit of the cutter wing 2 whose tip rotates
Try not to interfere with 14.

Each long hole 15 is closed by a blind lid 17 to prevent water leakage or the like.

Since the outer diameter of the docking hood 10 is the same as the outer diameter of the shield frame 1, the excavation resistance hardly increases.

After digging the side tunnel 26 to just before the main tunnel 7, the digging is stopped so that the cutter wing 2'without the outermost peripheral bit 14 is located on the top side, the blind lids 17 are removed, and the brackets are removed. 16 through each long hole 15 and welded to the inner peripheral side of the docking hood 10,
The rod 22 of the hydraulic jack 18 to the intermediate joint 23 and the pin 24.
Connect through.

Then, the rod 22 of each hydraulic jack 18 is synchronously projected, and the docking hood 10 is pushed forward through the bracket 16. If the stroke of the hydraulic jack 18 and the length of the long hole 15 are sufficiently long, the notch 12 on the tip side of the docking hood 10
Adheres to the outer surface of the segment 11 of the main tunnel 7. However, if the stroke of the hydraulic jack 18 or the length of the long hole 15 is short, after pushing out to the first stroke end, the bracket 16 is removed by chipping or the like, and the rod 22 of the hydraulic jack 18 is retracted before the bracket is removed. 16 is fixed to the rear portion of the docking hood 10 again, and the docking hood 10 is pushed out again by the hydraulic jack 18 so that the notch 12 of the docking hood 10 is brought into close contact with the segment 1.

At this time, since the outermost peripheral bit 14 is not attached to the tip of the cutter wing 2'stopped on the top side, there is no interference when the docking hood 10 is pushed out, and the bottom half of the tip of the docking hood 10 is notched. Since the outer peripheral bit 14 of the other cutter wing 2 is provided, the outer peripheral bit 14 does not interfere when the docking hood 10 is pushed out.

Further, since the docking hood 10 is always in close contact with the outside of each long hole 15 while moving, the earth and sand never flow into the shield frame 1 directly. When there is a large amount of groundwater or the like, injecting the waterproofing agent to the outside from each of the long holes 15 or the like can minimize the intrusion of groundwater or mud.

In this way, the ground above the connecting portion between the main tunnel 7 and the side tunnel 26 is supported by the docking hood 10, so that the worker can go out from the entrance and exit of the partition wall 5 to the face of the cutter, and the cutter wings 2, 2 '. Etc. are removed, and the earth and sand of the remaining connecting portion are excavated and discharged by the screw conveyor 6. Generally, since the earth pressure is the largest in the vertical direction and is extremely small in the lateral direction, it is usually sufficient to support the upper half as in this embodiment, and the operator can work safely without the risk of the ground collapse.

Since the connecting work is usually performed last and not frequently, the gap between the docking hood 10 and the small-diameter portion 9 of the shield frame 1 on the rear end side is normally sealed by a sealing member such as a sealing material 27. The front end side is sealed with a sealing member such as caulking material 28, and a lubricant such as grease is sealed in the gap between the docking hood 10 and the small diameter portion 9 to prevent rust, and the docking hood 10 is prevented from sticking to the small diameter portion 9. It is good to do it.

Not only does the grease prevent rust, but also the docking hood
Also plays a lubricating effect when putting in and out of 10. Further, in order to reduce friction when the docking hood 10 is taken in and out, a sealing material may be provided on the inner peripheral side of the docking hood 10.

Further, since the docking hood 10 rotates when the bracket 16 is removed to cause a positional deviation, a concave notch 29 is provided at the rear end of the docking hood 10 as shown in FIG. The bracket 30 fixed to the outer circumference of the small diameter portion 9 may be fitted into the concave cutout 29 to prevent rotation.

Furthermore, the stroke of the hydraulic jack 18 is the docking hood.
If the stroke of 10 is enough,
The bracket 16 is permanently fixed and the bracket 16 and the intermediate joint 23 are hermetically sealed by a cover to prevent intrusion of ground water, muddy water, or the like.

Furthermore, the shape of the front end portion of the docking hood 10 need not interfere with the outermost peripheral bit 14 of the cutter wing 2 when protruding, and therefore, only the portion that interferes with the outermost peripheral bit 14 may be cut out.

The present invention is not limited to the above embodiments,
In the case of a shield machine having a direction changing function, the equipped hydraulic jack for changing the direction may be used to move the docking hood, it may be applied to various types of sealed shield machines, and it may be connected. Needless to say, various changes can be made without departing from the gist of the present invention, for example, a ground hardening agent may be used in combination when the ground is extremely weak.

[Effects of the Invention] As described above, according to the present invention, the following excellent effects can be achieved.

A docking hood was provided on the outer periphery of the tip of a sealed shield machine that prevents the face from collapsing by blocking the face with a partition wall, so that the docking hood is projected when connecting to the existing tunnel. The ground around the existing tunnel, which is disturbed by excavation, can be supported easily and surely by making contact with the ground, and therefore the existing tunnel is highly reliable without large-scale ground improvement. It is possible to perform a safe connection work with.

Moreover, since the docking hood is formed in a continuous tubular shape, it is possible to prevent the sealing property of the shield frame from being impaired.
It is thin and has high rigidity, and it is possible to perform stable projection along the shield frame with a small force.Furthermore, by eliminating the circumferential gap from the docking hood as much as possible, the ground collapses from the gap. As a result, it is possible to reliably prevent dirt and sand from entering the inside.

Furthermore, since the shape change part is formed at the tip of the docking hood, the docking hood can be brought into contact with the existing tunnel to minimize the gap between the abutting parts, and the ground will collapse from the gap and the interior will collapse. It is possible to prevent dirt and sand from entering the area.

Since the outer diameter of the shield frame and the docking hood are the same, it is possible to eliminate the adverse effect on the normal excavation due to the unnecessary docking hood provided during normal excavation. It is necessary to increase the turbulence of sand and sand, increase the propulsion resistance, increase the capacity of the shield jack for propulsion due to the increase in propulsion resistance, and increase the size of the excavation pit by the outer diameter of the docking hood. The amount of excess excavation in the excavation pit increases and the amount of excess excavation increases the clearance between the segment and the excavation, and a large amount of filler must be injected to fill the clearance. Various problems such as ground subsidence caused by a large clearance can be suppressed.

Since the notch that accommodates the outermost peripheral bit when the docking hood is projected is formed in the part of the tip of the docking hood that interferes with the outermost peripheral bit provided on the cutter, the outermost peripheral bit should be attached when joining with the existing tunnel. The docking hood can be swiftly and reliably projected without removing it.

[Brief description of drawings]

FIG. 1 is an explanatory view of an embodiment of the present invention, and FIG. 2 is a view of FIG.
II-II direction arrow view, FIG. 3 is a III-III direction arrow view of FIG. 1, and FIG. 4 is an explanatory view showing the state of the docking hood during normal excavation shown in FIG. 1, FIG. Is a view from the direction of VV in FIG. 4, FIG. 6 is an explanatory view of the docking hood anti-rotation mechanism in FIG. 1, and FIG. 7 is an explanatory view showing a connecting work state by a conventional shield machine. . 1 is a shield frame, 2 and 2'is cutter wings, 7
Is the main tunnel, 9 is the small diameter part, 10 is the docking hood, 11
Is a segment, 12 is a notch, 14 is an outermost peripheral bit, 15 is a long hole, 16 is a bracket, 18 is a hydraulic jack, and 26 is a side tunnel.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Teruo Matsushima 1-2-7 Moto-Akasaka, Minato-ku, Tokyo Kashima Construction Co., Ltd. (72) Takashi Mitsui 1-2-7 Moto-Akasaka, Minato-ku, Tokyo Kashima Construction Co., Ltd. (72) Inventor Ryusaburo Otsuka 11-1 Kitahama-cho, Chita-shi, Aichi Ishikawajima Harima Heavy Industries, Ltd. Aichi Plant (72) Keiji Maeda 11-11 Kitahama-cho, Chita-shi, Aichi Ishikawajima Harima Heavy Industry Co., Ltd. Aichi Factory (72) Inventor Masao Yoda 11-1 Kitahamacho, Chita City, Aichi Prefecture Ishikawajima Harima Heavy Industry Co., Ltd. Aichi Factory (56) Bibliography 57-51794 (JP, U) Special JP-A-46-26707 (JP, B1) JP-B-49-18166 (JP, B1)

Claims (1)

[Claims] 1. A cylindrical frame which is continuous in the circumferential direction is formed on the outer periphery of the front end of a shield frame in a sealed shield machine in which a partition wall is used to prevent the face from collapsing so as to prevent the face from collapsing. , Equipped with a docking hood that can project only when it is connected to an existing tunnel, and the tip of the shield frame when the shape change part that matches the outer shape of the existing tunnel to be joined is formed at the tip of the docking hood A small diameter portion is formed on the portion, a docking hood is externally fitted to the small diameter portion, and the outer diameter of the docking hood is configured to be the same as the outer diameter of the shield frame,
In addition, a shield excavation for underground bonding characterized in that a notch for accommodating the outermost peripheral bit when the docking hood is projected is formed in a portion of the tip of the docking hood that interferes with the outermost peripheral bit provided on the cutter. Machine.