JPH0224998B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a large-diameter shield machine for constructing a shaft such as a tunnel underground.

(Prior technology) An earth pressure type mechanical shield machine used for tunnel excavation is of the type that mixes the excavated soil taken inside and the injected mud material such as bentonite, thereby suppressing the face. There is something like that.

In this shield construction method, the excavated soil is injected into the excavated soil and mixed in the chamber of the shield machine to convert the excavated soil into mud, and the earth pressure from this mud is used to stabilize the face while excavating. The mixing mechanism that mixes the excavated soil and soil materials becomes important as the excavated soil becomes mud.

FIG. 1 shows a conventional example of this type of shield machine, and the mixing inside the chamber 22' defined by the partition wall 2' is usually carried out on the back side of the cutter wing 7' of the rotary excavator 3'. This is done by a kneading blade 8' installed at the top.

In this case, since the mixing blade 8' is provided behind the cutter wing 7', it rotates at the same speed as the cutter wing 7'. By the way, with the current manufacturing technology of shield machines, the rotational speed of the excavating tool is generally 20 m/min to 30 m/min in the tangential direction of the outermost part due to the durability of the excavating tool.
It is designed to be about min. For this reason, as the diameter of the shield machine increases, the mixing effect near the inner periphery of the chamber 22' becomes worse than near the outer periphery.
The drawback was that it was difficult to convert the excavated soil into uniform mud.

(Object of the Invention) The present invention has been proposed in view of the above points, and its purpose is to provide a large-diameter shield machine with a rotary excavator installed at a position substantially concentric with the excavator at the rear of the rotary excavator for cutting a face. By providing a mixing device that rotates and also rotates around a shaft extending approximately in the diameter direction of the shield machine, the excavated soil in the mud-making soil chamber can be easily spread over the outer and inner circumferences. An object of the present invention is to provide a shield machine capable of quickly converting mud into mud.

(Structure of the invention) The present invention will be described below with reference to the drawings.

Figures 2A to 2C show one embodiment of the present invention. In the figure, 1 is a cylindrical shield cylinder with a relatively large diameter. An elongated disk-shaped compartment 2 is formed.

Reference numeral 3 denotes a rotary excavator which is rotatably provided at the front end opening of the shield tube 1 and functions as a so-called cutter, and has a plurality of cutter spokes 5 extending radially from a boss 4 provided in the center toward the outer periphery.
, a bit 6 protruding from the front of the cutter spoke 5, a center shaft 7 connected to the boss 4, extending approximately at the center of the shield cylinder 1, and rotatably supported; It is equipped with a fishtail-shaped center bit 8 protruding from the tip of the cutter spoke 5, and a mixing blade 9 provided at the rear of the cutter spoke 5, and a spacer is provided at approximately the center rear of the cutter spoke 5. An intermediate support member 1 extends through a ring-shaped hole 2a formed in the chamber 2.
0 is concatenated.

Reference numeral 11 denotes a drive motor capable of forward and reverse rotation for rotating the rotary excavator 3 , and is fixed to a frame 12 appropriately provided behind the partition wall 2 in the shield tube 1. The support member 10 is a rotation transmission mechanism 13 having gears etc.
connected via.

Thus, the rotation of the drive motor 11 is transmitted to the rotation transmission mechanism 13 and the intermediate support member 10, thereby rotating the excavating tool 3 around the center shaft 7.
is configured to rotate and excavate the ground. In this case, in the center of the center shaft 7, there is a central injection pipe 15 for injecting mud material toward the face from a mud material injection port 14 opened at the tip.
is formed to penetrate in the axial direction, and around it is a peripheral injection pipe 16 for injecting soil material into the surrounding area.
is formed. The peripheral injection pipe 16 extends approximately perpendicularly from the tip of the center shaft 7 along the length direction inside the cutter spoke 5, and has a mud material injection port 17 formed at an appropriate location on the cutter spoke 5. , 18.

Reference numeral 19 denotes a mixing device which mixes the excavated soil taken into the mud-making soil chamber 20, which is partitioned by the front inner circumferential wall 1a of the shield tube 1, the front surface of the partition wall 2, etc., and the mud-making soil material injected as necessary. This kneading device 19 is for kneading and turning into mud.
denotes at least one mixing rod 21 extending radially in the approximately diametrical direction of the shielding machine, that is, from the vicinity of the center shaft 7 toward the outer periphery and having a generally round bar shape.
For example, mixing blades 22 protruding radially are installed at appropriate locations along the length of the mixing rod 21.
A cap-shaped small gear 23 provided at the base end of the mixing rod 21, a cap-shaped large gear 24 meshing with the cap-shaped small gear 23 substantially orthogonally, and this cap-shaped large gear 24. A cylindrical rotating member 25 is provided at the tip, passes through the center of the partition wall 2, is provided on the outer periphery of the center shaft 7, supports the center shaft 7, and is rotatable independently with respect to the center shaft 7. , and a drive motor 27 capable of forward and reverse rotation, which rotates the cylindrical rotating member 25 via a gear mechanism 26 provided therebetween. In this case, when the mixing blades 9 are installed on the cutter spoke 5, the mixing blades 25 of the mixing device 22 and the mixing blades 9 provided on the cutter spoke 5 are provided so as not to collide with each other. Needless to say, there are. In addition, since the present invention is provided with the mixing device 19 in the sludge cultivation chamber 20, the mixing blade 9 may be omitted in some cases. Further, the kneading rod 21 and the kneading blades 22 of the kneading device 19 may be configured in a screw shape.

Reference numeral 28 denotes a discharge device of a well-known structure whose front end is provided in a manner that allows communication with the lower part of the mud-making soil chamber 20, and includes a cylindrical body 29 and a screw conveyor 30 rotatably provided within the cylinder body 29. It is equipped with

In addition, in the above-mentioned shielding machine, there are seals such as between the intermediate support member 10 and the partition wall 2, the mixing rod 21, and the cap-shaped gear storage part 31 provided at the front of the central part of the partition wall 2 and in which the gear is housed. Seal member 3 to prevent mud from entering where it is necessary
2 is provided.

Next, the operation of the present invention will be explained.

Excavation of the earth is performed by a rotary excavator 3 . That is, when the drive motor 11 is driven, the rotation of the drive motor 11 is transmitted to the rotation transmission mechanism 13, the intermediate support member 10, and the cutter spokes 5, and the rotary excavator 3 rotates around the center shaft 7, and the center bit is rotated. 8 and bit 6, etc., the face is excavated. In this case, a swivel joint 34 is provided at the rear end of the center shaft 7, which is connected to a sludge material injection pipe 33, and the swivel joint 34 is connected to a sludge material injection pipe 33 to inject sludge material if necessary depending on the condition of the excavated soil. Mud material injection pipe 33 and swivel joint 34
Inject via. That is, a part of the mud material can be injected into the excavated soil through the central injection pipe 15 from the mud material injection port 14 in the center of the rotary excavator 3 , and can also be injected into the excavated soil through the peripheral injection pipe 16. The excavated soil can also be injected from the soil material injection ports 17 and 18. Note that if the ground contains a large amount of silt or clay, it is not necessary to inject the soil material.

The excavated soil is then taken into the mud chamber 20 together with the injected mud-making soil materials, and is transferred to the mixing rod 21 and mixing blade 22 of the mixing device 19 , as well as the cutter spoke 5 of the rotary excavator 3 . If a mixing blade 9 is installed in the mixing blade 9, the mixing blade 9 also converts the soil into mud.

In other words, the kneading wing 9 is the cutter spoke 5.
If the cutter spoke 5 rotates, the axis m- centered on the center shaft 7
Rotate around m to mix.

In addition, since the kneading blade 22 of the kneading device 19 has a kneading rod 21 loosely connected to the intermediate support member 10 connected to the cutter spoke 5, the axis of the kneading blade 22 of the kneading device 19 as well as the cutter spoke 5 changes as the kneading rod 21 rotates. m-m
rotate around. Further, at the tip of the mixing rod 21, the small gear 23 meshes with the large gear 24 substantially orthogonally, so that the mixing rod 21 is aligned with the axis m-m.
When the kneading rod 21 rotates around the axis nn, the small gear 23 rotates along the large gear 24, so that the mixing rod 21 also rotates around the axis nn. On the other hand, drive motor 2
7 rotates, the cap-shaped large gear 24 rotates via the gear mechanism 26 and the cylindrical rotating member rotatably supported at the center of the partition wall 2, and this rotational force is transmitted to the cap-shaped small gear 23. The mixing rod 21 rotates around the axis nn, and therefore the mixing blade 22 also rotates around the axis nn.

In this way, the kneading device 19 is driven by the drive motor 1.
1 or 27, it rotates around the axis m-m or around the axis n-n, so even in a large-diameter shield machine, the excavated soil and soil material in the mud-making soil chamber are effectively mixed and converted into mud. be able to.

As is well known, if the shield cylinder 1 is pushed forward by a drive means such as a jack (not shown), earth pressure is generated, which can press down the face, and the soil is suitable for pressing the face. The excavation work can be carried out by discharging the mud in the mud chamber 20 through the discharge device 28 as the shield machine moves forward while maintaining the pressure.

FIG. 2 shows another embodiment of the present invention,
This example is characterized in that the rotary excavator is composed of an inner circumferential excavator 3A and an outer circumferential excavator 3B that are driven separately, and that the cap-shaped large gear 24 is fixed to the center shaft 7. .

That is, in this embodiment, a rotatable inner circumferential excavating tool 3A functioning as a so-called cutter is provided at the front end opening of the shield tube 1, and a drive source separate from the inner circumferential excavating tool 3A is provided on the outer periphery of the rotatable inner circumferential excavating tool 3A. Therefore, a rotatable outer peripheral excavation tool 3B is provided.

The inner circumferential excavator 3A includes a plurality of cutter spokes 5a extending radially from a boss 4 provided at the center toward the outer circumference and having a bit 6 protruding from the front portion thereof, and tar spoke 5
A mixing blade 9 provided as necessary behind a.
a, is connected to the boss 4, extends approximately at the center of the shield cylinder 1, is rotatably supported via a support member provided at the center of the partition wall 2, etc., and has a fishtail shape at its tip. A center shaft 7 with a protruding center bit 8, and a gear mechanism 2 provided on the rear side of the center shaft 7.
The drive motor 27 is configured to include a drive motor 27 capable of forward and reverse rotation and capable of rotating the center shaft 7 via the drive motor 6.

The outer circumferential excavator 3B includes a plurality of cutter spokes 5b provided on the substantially coplanar outer circumferential portion of the cutter spokes 5 of the inner circumferential excavator 3A , and from which bits 6 are protruded from the front portion. A kneading blade 9b is provided at the rear of the cutter spoke 5b as necessary, and the front end is connected to the rear inner end of the cutter spoke 5b, extends rearward through the partition wall 2, and the rear end rotates. The intermediate support member 10 is connected to a drive motor 11 that can rotate in forward and reverse directions via a transmission mechanism 13.

Reference numeral 19 denotes a kneading device substantially similar to that of the above-described embodiment, which is provided behind each cutter spoke 5a, 5b.
A plurality of kneading rods 21 extending radially through the kneading rods and having a substantially round bar shape, kneading blades 22 of an appropriate shape provided at appropriate positions in the length direction of the kneading rods 21, A cap-shaped small gear 23 provided at the base end of the mixing rod 21;
It is constituted by a cap-shaped large gear 24 which is fixed to the center shaft 7 and meshes substantially perpendicularly to the center shaft 7.

The other configurations are substantially the same as those of the previous embodiment.

In operation, in this embodiment, the earth is excavated by the inner circumferential excavating tool 3A and the outer circumferential excavating tool 3B.
It is carried out by. That is, when the drive motor 27 is driven, this rotation is transmitted to the center shaft 7 via the gear mechanism 26 and the cutter spoke 5
a rotates, and the face is excavated via the center bit 8, bit 6, etc. of the inner peripheral excavation tool 3A . In this case, since the cap-shaped large gear 24 rotates with the rotation of the center shaft 7, the kneading rod 21 having the kneading blades 22 rotates as the cap-shaped large gear 24 rotates.
It rotates around the n-axis via the cap-shaped pinion gear 23 that meshes with the n-axis.

Further, when the drive motor 11 is rotated, the rotation is transmitted to the cutter spoke 5b having the bit 6 via the intermediate support member 10 etc., and the face can be excavated by the outer peripheral excavating tool 3B . In this case, the kneading blades 22 of the kneading device 19 are loosely connected to the intermediate support member 10 through which the kneading rod 21 communicates with the cutter spoke 5b, so that the kneading blades 22 are aligned with the axis n- As the intermediate support member 10 rotates, it forcibly rotates around the axial axis m-m approximately concentrically with the center of the shielding machine, similar to the cutter spoke 5b, for effective kneading. Mixing can be done.

In these processes, the inner and outer circumference excavators 3A and 3B are driven by dedicated drive motors 27 and 3B, respectively.
11, it can be rotated arbitrarily,
For example, depending on the mixing state, these drive motors 2
By adjusting the rotations of 7 and 11 by speeding up or slowing down as appropriate, it is possible to obtain uniform mud over the outer periphery or inner periphery of the mud cultivation chamber 20.

(Effects of the Invention) As described above, according to the present invention, in a large-diameter shield machine, the rotary excavator rotates approximately concentrically with the excavator behind the rotary excavator that cuts the face, and rotates approximately in the diametrical direction of the shield machine. By providing a mixing device that also rotates around an extending shaft, there is an advantage that the excavated soil in the mud-making soil chamber can be easily and quickly converted into mud across the outer and inner peripheral portions.

[Brief explanation of drawings]

Fig. 1 shows a conventional example, Fig. 2 A to C show an embodiment of the present invention, where A is a front view, B is a vertical sectional view, and C is A in B.
-A sectional view, FIG. 3 is another embodiment of the present invention,
A is a front view, and B is a longitudinal sectional view. 3 ...Rotating drilling tool, 19 ...Kneading device.

Claims (1)

[Claims] 1. In a shield machine, a rotary excavator that cuts a face, and a rotary excavator that rotates approximately concentrically with the excavator behind the rotary excavator and also rotates around an axis that extends approximately in the diametrical direction of the shield machine. A shield machine characterized by being equipped with a kneading device.