JPS6343276Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention is a shield type tunnel excavator configured to discharge stabilizing liquid from Katsutaface in order to stabilize the face and promote the fluidization of the water. This is related to the rotary joint.

[Conventional technology]

1 to 4 show a conventional shield type tunnel excavator of this type, in which 1 is a shield body, 2 is a shield jack, 3 is a cutter ace, 4 is a large gear disposed on the back of the cutter ace, and 5 is a shield type tunnel excavator. is a small drive gear that meshes with the large gear; 6 is a motor for driving the small gear; 7, 8, and 9 are bearings; 10 and 11 are seals; 12 is a discharge screw conveyor; 13 is a gate for the conveyor; 14 is a drive bearing portion of the conveyor, and 15 is a conveyor drive motor.

A rotary joint 17 is provided on the back side of the Katsutaface 3, which includes an inside body 20 fixed to the shield main body 1 via a fixture 16, and an outside body 22 fixed to the Katsutaface 3 and rotating around the outer circumference of the inside body. The outside body 22 is provided with a stabilizing liquid discharge pipe 18 that communicates with a stabilizing liquid passage groove to be described later.
A plurality of stabilizing liquid discharge ports 19 arranged on the front surface of the cutter face 3 communicate with each other via the cutter face 3.

FIG. 3 shows details of the rotary joint, in which an inside body 20 is fixed to the shield body 1 via a fixture 16, and an outer body 20 is fixed to the cutter ace 3 via bolts 21 on the outer periphery of the inside body 20. A side body 22 is rotatably fitted.

In the figure, 23 is a seal, and 24 is a retainer fixed to the tip of the inside body 20 via a bolt 25.

A stable liquid supply hole 28 is provided in the inside body 20 and communicates with a stable liquid supply pipe 27 via a pipe fitting 26, and the stable liquid supply hole 28a branches out from this in the radial direction. As shown in FIG.
It communicates with 9. A plurality of stable liquid discharge pipes 18 are connected to the pipe fitting 30 in the stable liquid passage groove 29.
The piping 18 is further connected to a plurality of stabilizing liquid discharge ports 19 provided in the cutter face 3.

[Problem that the invention attempts to solve]

In the conventional technology as described above, the stabilizing liquid passage groove 29 is formed in an annular shape over the entire circumference of the inner peripheral surface of the outside body 22.
A plurality of stable liquid discharge pipes 18 are connected to 9 . Therefore, the stabilizing liquid flowing from the supply hole 28 into the passage groove 29 undergoes a sudden pressure drop. Furthermore, the stabilizing liquid supplied from the stabilizing liquid supply pipe 27 is
The stabilizing liquid is not necessarily discharged evenly from all of the plurality of stabilizing liquid discharge ports 19, but is mainly discharged from the discharge port at the bottom of Katsutaface or from a location with low resistance in the pipe or near the outlet, The supply of stabilizing liquid at the enlarged outlet becomes insufficient. Therefore, the stabilization of the face and the fluidization of the surface are not completely carried out.

The purpose of the present invention is to reliably supply a large amount of stable liquid at high pressure to the stable liquid discharge piping, thereby stabilizing the face and making the flow fluid.

[Means to solve the problem]

A cylindrical outside body is fixed to the back of a cutter ace rotatably provided on the front of the shield body, and an inside body inserted into this outside body is fixed to the front of the shield body.

A plurality of stable liquid passage grooves separated in the circumferential direction are provided on the inner peripheral surface of the outside body, and one stable liquid discharge pipe is connected to each of these stable liquid passage grooves.

A stable liquid supply hole that opens into the stable liquid passage groove as the cutter ace rotates is provided inside the inside body, and a stable liquid supply pipe inside the shield body is connected to the stable liquid supply hole.

[Effect]

When the stable liquid passage groove on the outside body communicates with the stable liquid supply hole on the inside body as the Katsutaface rotates, high-pressure stable liquid is supplied to a specific stable liquid discharge pipe without causing a sudden pressure drop. will be reliably supplied.

Therefore, a high pressure and large amount of stabilizing liquid is intermittently discharged from the stabilizing liquid discharge port of the cutter face, thereby stabilizing the face and further fluidizing the face.

In addition, the rotation of Katsutaface is generally approximately
Since the speed is low (5 rpm or less), the stable liquid is supplied smoothly from the stable liquid supply hole to the stable liquid passage groove, and pulsation due to opening and closing of the outlet of the supply hole does not occur to the extent that it has an adverse effect.

〔Example〕

5 and 6 show a first embodiment of a rotary joint for a shield type tunnel excavator according to the present invention, in which an inside body 120 is connected to a fixture 116.
An outside body 122, which is fixed to the cutter ace 103 through bolts 121, is rotatably fitted on the outer periphery of the inside body 120.

In the figure, 123 is a seal, and 124 is a bolt 12.
This is a retaining tool fixed to the tip of the inside body 120 via 5.

A stabilizing liquid supply hole 128 is provided inside the inside body 120 and is connected to a stabilizing liquid supply pipe 127 via a pipe fitting 126.
The supply hole 128 communicates with a stabilizing liquid passage groove 129a provided on the inner circumferential surface of the outside body 122 via a stabilizing liquid supply hole 128a extending in the radial direction branching out from the supply hole 128.

As shown in FIG. 6, the stabilizing liquid passage groove 129a is provided not on the entire circumference of the inner circumferential surface of the outside body 122 but on a part of the inner circumferential surface of the outside body 122, and the stabilizing liquid passage groove 129a A circumferential portion a exists between the stabilizing liquid passage groove 129b and a similar stabilizing liquid passage groove 129b provided opposite to the circumferential portion a. The circumferential portion a is rotatable relative to the outer periphery of the inside body 120, and is tightly fitted to prevent the stabilizing liquid from escaping.
Further, these stabilizer liquid passage grooves 129a and 129b are connected to stabilizer liquid discharge pipes 131a and 131b, which communicate with the stabilizer liquid outlet of the cutter face 103 (see FIG. 1), through pipe fittings 130, respectively. .

When the cutlet ace 103 is driven and rotated, the outside body 122 follows the cutter ace 103 and rotates along the outer periphery of the inside body 120 fixed to the shield body, and the stabilizing liquid in the inside body 120 is rotated. Supply hole 1
28a and the stabilizing liquid passage groove 129a of the outside body 122, the stabilizing liquid flows through the stabilizing liquid supply holes 128, 128 of the inside body 120.
a, the stabilizing liquid passage groove 129a, the stabilizing liquid discharge pipe 131a, and the stabilizing liquid discharging port of the cutter face 103 to the face. However, the stable liquid flowing through the stable liquid supply holes 128 and 128a is blocked from the stable liquid passage groove 129b, and the pipe 131
It does not flow to b.

When the outside body 122 further rotates 180 degrees, the stabilizer supply hole 128a becomes the stabilizer liquid passage groove 129.
b, and the stabilizing liquid flows into the stabilizing liquid discharge piping 131b. Therefore, a large amount of stabilizing liquid is supplied to the face at a constant pressure from a specific stabilizing liquid discharge port, promoting stabilization of the face and fluidization of the water.

Stabilizing liquid supply hole 128a of stable liquid passage groove 129a
The angle of communication in the circumferential direction is Katsutaface 1
The range in which the stabilizing liquid is discharged from the stabilizing liquid discharge port 03 to the face is variously limited. For example, in FIG. 6, the stabilizing liquid passage groove 129a at the upper end
and the stabilizer supply hole 128a at an angle of 90°,
Further, if the range is set at 45 degrees to the left and right from the illustrated position, and if the pipe 131a communicating with the upper stabilizing liquid passage groove 129a is communicating with the stabilizing liquid discharge port 19a of the cutter face shown in FIG. The stabilizing liquid is discharged from the discharge port 19a at 1 in Fig. 2 while the cutter ace 103 rotates 360 degrees.
The range is ±45° from the position 9a.

7 to 9 show a second embodiment of the present invention, in which a plurality of stabilizing liquid supply holes 128 extending in the radial direction from a stabilizing liquid supply hole 128 disposed in the inside body 120 communicating with a stabilizing liquid supply pipe 127 are shown. Stage stabilizer supply holes 128a and 128b are provided.

In the first embodiment described above, only one stage of stabilizing liquid supply holes 128a extending in the radial direction is provided, so that the supply holes 128a and the stabilizing liquid passage grooves 129
The angle of communication between a and a cannot be 360°.

Therefore, when the stabilizing liquid is continuously supplied by a pump or the like, it is necessary to provide a bypass circuit synchronized with this rotary joint when the two are not in communication. By providing the supply holes 128a, 128b in multiple stages as shown in FIG.
The drawbacks of the first embodiment can be eliminated if the sum of the angles of communication with c and 129d without overlapping each other is 360 degrees or slightly more.

In the second embodiment, parts equivalent to those in the first embodiment are given the same reference numerals.

[Effect of idea]

The shield tunnel boring machine of the present invention comprises a cutter face rotatably disposed on the front surface of the shield body, a cylindrical outside body having an axial end face fixed to the rear surface of the cutter face, an inside body fixed to the front of the shield body and inserted axially into the outside body, a plurality of stabilizing liquid passage grooves provided at separate locations in the circumferential direction on the inner peripheral surface of the outside body, and stabilizing liquid discharge pipes connected to each of these stabilizing liquid passage grooves and opening on the surface of the cutter face.
A stabilizing liquid supply hole is provided inside the inside body and opens into the stabilizing liquid passing groove as the cutter face rotates, and a stabilizing liquid supply pipe is connected to the stabilizing liquid supply hole.When the stabilizing liquid passing groove of the outside body and the stabilizing liquid supply hole of the inside body are connected as the cutter face rotates, stabilizing liquid is supplied to a specific stabilizing liquid discharge pipe, which produces the following effects.

Conventionally, stabilizing liquid passage grooves, which were formed in an annular shape around the entire circumference of the inner peripheral surface of the outside body or the entire circumferential surface of the inside body, are now arranged in multiple locations separated in the circumferential direction on the inner peripheral surface of the outside body. When the stable liquid passage groove of the outside body communicates with the stable liquid supply hole of the inside body as the Katsutaf Ace rotates, a specific stable liquid discharge hole of the Katsutaf Ace connected to the stable liquid passage groove of the inside body is provided. Stabilizing liquid is supplied only to the piping. Therefore, no particular pressure drop occurs in the stable liquid passage groove, and a constant pressure on the stable liquid supply hole side is reliably applied to the stable liquid discharge port of the Katsutaf Ace as the Katsutaf Ace rotates. A large quantity of stabilizing liquid is supplied. Therefore, stabilization of the face and fluidization of the bottom can be achieved by using a high pressure and large amount of stabilizing liquid that is reliably supplied.

[Brief explanation of drawings]

Figure 1 is a vertical side view of a conventional shield type tunnel excavator, Figure 2 is a view taken in the direction of the arrows in Figure 1, Figure 3 is a vertical side view of its rotary joint, and Figure 4 is a side view of the rotary joint in Figure 3. 5 is a vertical cross-sectional side view showing the first embodiment of the rotary joint part of the shield type tunnel excavator according to the present invention, and FIG. 6 is a view as viewed from the arrow in FIG. The figure is a longitudinal sectional side view showing a second embodiment of the rotary joint portion, and FIGS. 8 and 9 are a view taken along the arrows in FIG. 7 and a view taken along the arrows, respectively. 103...Katsutafu Ace, 120...Inside body, 122...Outside body, 127...
Stabilizing liquid supply pipe, 128, 128a... Stabilizing liquid supply hole, 129a, 129b... Stabilizing liquid passage groove, 131
a, 131b... Stable liquid discharge piping.

Claims (1)

[Scope of utility model registration request] 1. A shield body, a cutlet ace rotatably disposed on the front surface of the shield body, a cylindrical outside body whose axial end face is fixed to the back surface of the cutlet ace, and a cylindrical outside body fixed to the front part of the shield body. an inside body inserted into the outside body in the axial direction; a plurality of stable liquid passage grooves provided circumferentially apart on the inner peripheral surface of the outside body; and these stable liquid passage grooves. a stable liquid discharge pipe that is connected to one each and opens on the surface of the cut-off ace, a stable liquid supply hole that is provided inside the inside body and opens into the stable liquid passage groove as the cut-off ace rotates, and the stable liquid A shield type tunnel excavator consisting of a stabilizer supply pipe connected to a supply hole.