JPS6040703Y2 - shield tunneling machine - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a shield excavator, and its purpose is to eliminate the adhesion and growth of excavated soil on the cutter head and other members placed at the front of the shield, and to eliminate the compaction thereof. When a plastic fluidization improver is injected into excavated soil, the purpose is to improve the soil removal efficiency or excavation efficiency by improving the mixing state.

When excavating with a shield excavator, a chamber for taking in the excavated soil (face pressure chamber: regardless of mud water type or earth pressure type) is provided at the front of the shield, and the excavated soil taken into this chamber is The face is pressurized by earth pressure of earth and sand or mud water pressure to prevent the face from collapsing.

The face ground is excavated by a rotary cutter head, but in order to perform the excavation efficiently, the excavated earth and sand in the intake chamber are sequentially transferred to the rear earth removal chamber (atmospheric pressure chamber) according to the amount taken in. ).

However, depending on the nature of the excavated soil in the intake chamber, some materials (such as gravel) do not become plastically fluidized.
In some cases, the excavated earth and sand that are successively taken in become compacted in the intake chamber, making it impossible to perform a good soil removal action.

Furthermore, even if a plastic fluidization improver is injected, stirring and mixing may not be performed sufficiently, leading to similar results.

Furthermore, in the case of clayey soil, etc., adhesion occurs to the elemental components in the intake chamber, and a good soil removal action cannot be achieved.

This phenomenon is more noticeable when using a shield tunneling machine with a large shield tunnel diameter.

This invention was made in view of the above, and therefore,
In this invention, a central shaft is integrally attached to the center of the back of the cutter head placed in front of the shield, a partition plate is fixed concentrically to the end of this central shaft, and the outer periphery of this partition plate is fixed to the end of the central shaft. An excavated earth and sand intake chamber is rotatably supported on a supporting member protruding from the inner surface of the shield to form an excavated earth and sand intake chamber outside the central axis at the front of the partition. A shield excavator is provided with an earth removal device between the earth removal chamber and the earth removal chamber, and a rotary agitation device is provided inside the excavated earth and sand intake chamber and outside the central axis, and the rotation axis is attached to the partition plate. The rotary shaft is rotatably supported relative to the partition plate and is connected via a gear mechanism to one end of a rotating cylinder which is supported concentrically, and the rotating cylinder and the partition plate are connected to each other. The structure is such that the drive device for the rotary agitation device and the drive device for the cutter head are connected in conjunction with each other. Since the excavated soil is agitated by a rotatably supported rotary agitator, even if the intake chamber is a stationary space that rotates together with the cutter head, the excavated soil can be compacted,
It is possible to break up or prevent sediment adhering to each member, and also to ensure sufficient stirring and mixing of the plastic fluidization improver, etc., and the rotary stirring device and cutter head are driven by separate drive devices. Therefore, by detecting the torque of these drive devices, it is possible to easily and quickly detect the location of a fault when a driving fault occurs.

Examples thereof will be described below with reference to FIGS. 1 to 3.

1 is a shield, and 2 is a cutter head.

The cutter head 2 is a spoke-type one shown in FIG.
Various types can be used as needed, such as A and the drawing board type type 2B shown in FIG.

A hollow central shaft 3 is integrally attached to the center of the back surface of the cutter head 2.

A disk-shaped partition plate 4 is fixed to the end of the central shaft 3 concentrically therewith.

A hollow drum 5 having a stepped portion 5A is fixed to the outer periphery of the partition plate 4, and the stepped portion 5A of the drum 5 is rotatable via a bearing 7 on a support member 6 protruding from the front end of the shield 1. Supported by

In this state, the cutter head 2 is placed in front of the shield 1.

Further, a sealing material 8 is interposed between the outer peripheral end surface of the partition plate 4 and the support member 6.

In this configuration, an excavated soil intake chamber 9 surrounded by the partition plate 4, the central shaft 3, the shield 1, and the support member 6 is configured in the front part of the partition plate 4.

A stirring blade 10 and a rotary stirring device 1 are installed inside the excavated soil intake chamber 9.
1 is provided.

That is, the stirring blades 10 are fixed at multiple locations on the outer periphery of the back surface of the cutter head 2 .

Further, the rotary stirring device 11 has one end and the other end of the rotating shaft 11A connected to the cutter head 2 and the partition plate 4 through bearings 12A and 12B, respectively, at multiple locations around the center shaft 3 and the stirring blades 10. be supported.

Further, the other end of this rotating shaft 11A passes through the partition plate 4 and extends inside the stepped portion 5A, and a gear 13A is fixed to this portion.

This is a 14-rotation cylinder, which has a bearing 15 inside the drum 5.
The drum 5 is supported concentrically and rotatably relative to the drum 5 via the drum 5.

A gear 13B is provided at the front end of the rotating cylinder 14, and this gear 13B meshes with the plurality of rotating shaft gears 13A described above.

A gear mechanism 13 is configured by these gears 13A and 13B.

Reference numerals 16 and 17 are drive motors (drive devices) for operating the rotary stirring device 11 and the cutter head 2, respectively.

All of these are installed on the shield 1 side.

The rotary stirring device drive motor 16 is operatively connected to the rotary cylinder 14 via a gear mechanism 18, and the cutter head drive motor 17 is operatively connected to the drum 5 via a gear mechanism 19.

Reference numeral 20 denotes an earth removal device composed of a screw conveyor.

The earth removal device 20 has an earth and sand inlet connected to the excavated earth and sand intake chamber 9.
It is located on the outer periphery of the inside, and extends through the support member 6 to the inside of the earth removal chamber 21 at the rear.

This earth unloading device 20 discharges excavated earth from the intake chamber 9 to the earth unloading chamber 21 while the face holding pressure in the intake chamber 9 is maintained.

On the other hand, 22 is an injection path for plastic fluidization improving material, which is connected to a fixed pipe 24 in the shield 1 via a rotary joint 23 and reaches the inside of the cutter head 2 through the center shaft 3. .

The illustrated example shows a case where the plastic fluidization improver is injected into the excavated soil intake chamber 9 from the cutter head 2 side.
This may be injected directly into the intake chamber 9 from within the shield 1 by forming a passageway through the support 6.

In the above, when the cutter head drive motor 17 is driven, the torque is transmitted to the cutter head 2 via the gear mechanism 19, the hollow drum 5, the partition plate 4, and the central shaft 3, and the cutter head 2 rotates to form the face. Excavation of the mountain is performed, and the excavated earth and sand is taken into the intake chamber 9.

In this case, the excavated earth and sand is stirred by the stirring blade 10 integrated with the cutter head 2, and at the same time, it is also stirred by the rotary stirring device 11.

That is, when the rotary agitator drive motor 16 is stopped while the cutter head drive motor 17 is in operation, the rotary agitator rotating shaft 11A moves together with the partition plate 4 or the cutter head 2. Top, gear 1 with rotating shaft
3A revolves around the rotating cylinder gear 13B while rotating.

Therefore, the rotary stirring device 11 also revolves inside the intake chamber 9 while rotating, and stirs the excavated earth and sand.

Also, when both drive motors 16 and 17 are operating, the rotary stirring device 11 rotates in a similar manner, but the rotational speed is higher than that of either drive motor 16 or 1.
It is controlled by increasing/decreasing the rotation speed or switching the rotation direction between forward and reverse directions.

In this case, if the rotational direction and rotational speed of the circumferential drive motors 16, 17 have a specific relationship, the rotary agitation device 11 will not rotate, but will only revolve.

Further, when only the cutter head drive motor 17 is stopped, the rotary stirring device 11 does not revolve, but only rotates.

Therefore, the excavated soil may be consolidated due to co-rotation with the cutter head 2 in the intake chamber 9, or may not be sufficiently mixed with the plastic fluidization improver, or the excavated soil may adhere to each member. If the earth removal device 20 is not able to remove soil effectively, such a situation can be improved by adjusting the rotational state of the rotary stirring device 11 to the various conditions described above.

It is also possible to prevent situations from occurring.

Furthermore, by detecting the rotational torque of each of the drive motors 16 and 17, it is possible to detect jamming of excavated earth and sand based on the load applied to each of the drive motors 16 and 17.

For example, if the drive motor 17 for the cutter head is overloaded, it can be detected that an obstruction such as a boulder is caught in the front surface of the cutter head 2, and conversely, if the drive motor 16 for the rotary agitator is overloaded, If this occurs, please contact intake room 9.
It can be detected that an obstruction has become lodged inside.

In this embodiment, it is possible to use a rotary stirring device 11 having a structure other than that shown in the figure, and various materials such as clayey soil, muddy water, mortar-like injection material, and fresh water are required as the plastic fluidization improving material. It can be used depending on the situation.

As is clear from the above explanation, according to the present invention, the excavated soil in the intake chamber can be stirred and mixed in various states, so that the intake chamber is not a static space that rotates together with the cutter head. Also, compaction, breaking down of soil and sand adhering to each member, etc.

It is possible to prevent this, and furthermore, to achieve a sufficient stirring and mixing state with the plastic fluidization improver and the like.

Therefore, it is possible to improve soil removal efficiency or excavation efficiency.

In particular, since the rotary agitation device and the cutter head are driven by separate drive devices, the location of the failure can be easily and quickly detected in the event of an operational failure by detecting the torque of these drive devices. .

[Brief explanation of the drawing]

1 to 3 show an embodiment of the present invention, in which FIG. 1 is a vertical side view, FIG. 2 is a front view, and FIG. 3 is a front view of a modified example. 1...Shield, 2, 2A, 2B...
Cutter head, 3... Central axis, 4...
Partition plate, 5...Hollow drum, 6...Supporting material, 7...Bearing, 9...Excavation earth and sand intake chamber, 11...・・Rotating stirring device, IIA・・・・
・Rotating stirring device rotating shaft 12A, 12B...Bearing, 13...Gear mechanism, 14...Rotating tube, 15...Bearing, 16... ... Drive motor for rotary stirring device, 17... Drive motor for cutter head, 18.19... Gear mechanism, 20...
...Earth removal device, 21...Earth removal room.

Claims (1)

[Scope of utility model registration request] A center shaft is integrally attached to the center of the back of the cutter head placed in front of the shield, and a diaphragm is fixed concentrically to the end of this center shaft, and the outer periphery of this diaphragm is attached to the inner surface of the shield. An excavated earth and sand intake chamber is rotatably supported on a protruding support member to form an excavated earth and sand intake chamber outside the central axis at the front of the partition, and an outer periphery of this excavated earth and sand intake chamber and an earth removal chamber at the rear of the partition. A shield excavator is equipped with an earth removal device between
A rotary agitation device is provided within the excavated soil intake chamber and outside the central shaft, and its rotating shaft is pivotally supported on the partition plate, and the rotating shaft is rotatable relative to the partition plate and concentrically. It is characterized in that it is connected to one end of a shaft-supported rotary cylinder via a gear mechanism, and the rotary cylinder and the partition plate are interlocked and connected to respective separate rotary stirring device drive devices and cutter head drive devices. A shield tunneling machine.