JPH0352877Y2 - - Google Patents

Description

[Detailed explanation of the idea] Industrial applications The present invention relates to a shield tunneling machine.

Conventional Technology In a shield excavator in which a cutter head is rotatably provided at the front of the shield body, as the diameter of the shield increases, there is a limit to the peripheral speed, which slows down the peripheral speed near the center, making it difficult to perform proper excavation. It disappears. Conventionally, there is a method to solve this problem, as disclosed in Japanese Utility Model Application Publication No. 57-66093. As shown in FIGS. 5 and 6, this shield tunneling machine has an opening 52 formed in the center of a cutter head 51, and a rotating shaft 52 inside the opening 52.
In addition, a cutter bit 54 is attached to the tip of the rotary shaft body 53, and a screw blade 55 for taking in soil is provided on the outer periphery of the rotary shaft body 53, and a cylindrical body 56 is placed on the outer periphery of the screw blade 55. A dirt port 58 is provided in the cylindrical body 56 and communicates with the dirt intake chamber 57 on the inner and outer periphery of the cutter head 51.
was formed.

Problems to be Solved by the Invention According to the above conventional configuration, the inner diameter of the cylindrical body attached to the rear surface of the cutter head is larger than the opening diameter at the center of the cutter head. There was a problem in that the earth and sand immediately flowed into the earth and sand intake chamber through the earth and sand outlet, causing the face corresponding to the center of the cut head to collapse.

Therefore, an object of the present invention is to provide a shield tunneling machine that can solve the above problems.

Means for Solving the Problem In order to solve the above problem, the shield excavator of the present invention has an opening that communicates with the earth and sand intake chamber formed in the face plate of the cutter head rotatably supported at the front of the shield body. In a shield excavator in which a rotary shaft body is rotatably arranged in an opening, a cutter bit is attached to the front end of the rotary shaft body, and a screw blade is attached around the rotary shaft body, on the inner periphery of the opening of the face plate, The earth and sand introducing tube is provided with a diameter slightly larger than the screw blade and a length longer than one pitch of the screw blade.

Function In the above configuration, the earth and sand excavated by the cut head is taken into the earth and sand intake chamber as is.
On the other hand, near the center of the face, the earth and sand excavated by the cutter at the front end of the rotary shaft enters the earth and sand intake chamber through the earth and sand introduction tube. By the way, when the earth and sand passes through the earth and sand introduction tube, the length of the earth and sand introduction tube is made longer than one pitch of the screw blade, so the earth and sand does not flow all at once from the face side to the earth and sand intake chamber side.

Embodiment Hereinafter, an embodiment of the present invention will be described based on the drawings.

In FIGS. 1 and 2, reference numeral 1 designates a cutter head that is rotatably supported at the front of the shield body 2 via a swing bearing 3, and a ring gear 4 attached to the rear end of the inner cylindrical portion 1a. It is operatively connected to a drive motor (for example, a hydraulic motor) 5 via the motor. Also, the shield body 2 behind the cutter head 1
Inner and outer partition walls 6A, 6B are provided inside, and an earth and sand intake chamber 8 is formed between these partition walls 6A, 6B and the cutter head face plate 7. A small-diameter circular opening 9 communicating with the earth and sand intake chamber 8 is formed in the center of the cutter head face plate 7, and a rotating shaft 10 is inserted through the opening 9, and an arm 11 is inserted through the front end of the opening 9. Te Katsutabitsu 12
At the same time, screw blades 13 are attached around the rotating shaft body 10. The rear part of the rotating shaft body 10 is rotatably supported in a holding cylinder 14 inserted through the inner partition wall 6A, and is connected to a drive motor (for example, a hydraulic motor) 16 via a ring gear 15 attached to the rear end. is linked to. On the inner circumferential surface of the opening 9 of the cutter head face plate 7, a soil introduction tube 17 having an inner diameter slightly larger than the outer diameter of the screw blades 13 and longer than one pitch of the screw blades 13 is installed in the earth and sand intake chamber 8. installed facing inward. Furthermore, within the rotating shaft body 10, there are two
Two fluid supply holes 18 and 19 are drilled, one end of which is opened inside the earth and sand introduction tube 17, and the other end of the other fluid supply hole 19 is opened into the face surface. Both fluid supply holes 18, 19
The other end is connected to a fluid supply pipe 21 via a rotary joint 20.
22, respectively. In addition, 23,2
4 is a mud water pipe that supplies mud water into the sediment intake chamber 8;
Reference numerals 25 and 26 are mud drain pipes for discharging the earth and sand in the earth and sand intake chamber 8.

In the above configuration, the earth and sand on the outer periphery excavated by the cutter head 1 is directly taken into the earth and sand intake chamber 8, and mixed with mud water injected from the mud water pipes 23 and 24, and then sent from the mud drainage pipes 25 and 26. be discharged. On the other hand, near the center of the face, the rotating shaft body 1
0 rotates the arm 11 at the tip to perform excavation, and the feeding action of the screw blade 13 sends the earth and sand through the earth and sand introducing tube 17 into the earth and sand intake chamber 8, and the mud drain pipes 25, 26. is discharged from. By the way, when the earth and sand passes through the earth and sand introduction tube 17, since the length of the earth and sand introduction tube 17 is made longer than one pitch of the screw blade 13,
The earth and sand do not flow all at once from the face side to the earth and sand intake chamber 8 side. If the screw blades 13 have two threads, each thread may be 1/2 pitch. Therefore, collapse of the face can be prevented. In addition, water can be injected into the face from the other fluid supply hole 19 as needed, and if the earth and sand in the earth and sand introduction pipe 17 becomes blocked, water can be injected from one fluid supply hole 18. If it is ejected, the blockage of earth and sand can be released.

Next, another embodiment will be described based on FIGS. 3 and 4.

In the above embodiment, the screw blades were directly attached to the rotating shaft, but in other embodiments, the screw blades are rotated separately from the rotating shaft. That is, a cylindrical body 33 is rotatably supported on the outer periphery of a rotating shaft body 31 via a bearing 32, and a screw blade 34 is attached to the outer periphery of this cylindrical body 33.
Of course, a ring gear 35 is attached to the rear end of the cylindrical body 33, and a drive motor 37 separate from the drive motor 36 of the rotating shaft body 31 is interlocked with the ring gear 35. . In addition,
The cylindrical body 33 is supported within a holding cylinder 39 via a bearing 38, so that the rotating shaft 31 is supported by the cylindrical body 33.
It is supported by the holding cylinder 39 via.

According to the above configuration, the screw blade 34 can be rotated separately from the rotating shaft body 31. For example, if the rotation of the screw blade 34 is stopped, the intake of earth and sand in the center part is eliminated, and the collapse of the face can be completely prevented. It can be prevented.

Effects of the invention According to the above-mentioned structure of the present invention, the earth and sand introduction tube is provided on the inner periphery of the opening of the cutter head face plate with a diameter slightly larger than that of the screw blades and a length longer than one pitch of the screw blades. The excavated earth and sand does not flow all at once into the earth and sand intake chamber from the face side, and collapse of the face can be prevented.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of one embodiment of the present invention, Fig. 2 is a view taken in the - arrow direction of Fig. 1, Fig. 3 is a sectional view of another embodiment, and Fig. 4 is a sectional view taken in the - arrow direction of Fig. 3. 5 is a sectional view of the conventional example, and FIG. 6 is a view taken along the - arrow in FIG. DESCRIPTION OF SYMBOLS 1... Cut head, 7... Cut head face plate, 8... Earth and sand intake chamber, 9... Opening, 10... Rotating shaft body, 12... Cut head, 13... Screw blade, 17... Earth and sand introduction tube.

Claims (1)

[Scope of utility model registration request] An opening communicating with the earth and sand intake chamber is formed in the face plate of the cutter head rotatably supported at the front of the shield body, a rotary shaft body is rotatably disposed within this opening, and a cutter head is rotatably supported at the front end of the rotary shaft body. In a shield excavator in which a screw blade is attached around the rotating shaft body, earth and sand are introduced into the inner periphery of the opening of the face plate with a diameter slightly larger than that of the screw blade and a length longer than one pitch of the screw blade. A shield excavator characterized by having a tube.