JPS6338319Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a mud drain pipe clogging prevention device in a mud water pressure shield.

When excavating a hard clay layer (also called a clay layer) using a mud water pressurization shield, the excavated earth and sand often turns into clods, which block the suction port 2 of the mud removal pipe 1, making soil removal impossible. As a result, the earth and sand left behind in the bulkhead 3 accumulates, creating resistance to the rotation of the cutter head and often making it impossible to excavate.

There are two cases where the clod 4 blocks the suction port 2 of the earth discharge pipe 1.

In other words, as shown in FIG. 1, the diameter D of the soil clod 4 is larger than the inner diameter d of the mud removal pipe 1, and the other case, as shown in FIG. This is when it becomes larger than the mouth.

If dirt accumulates inside the bulkhead 3, open the bulkhead 3 and remove the bulkhead 3.
Workers entered the building and had to manually remove the earth and sand, which caused the following problems.

(1) The construction period will be delayed because excavation will not be possible.

(2) Working inside a narrow shielded aircraft is difficult and dangerous.

(3) If it is necessary to improve the ground by pouring chemicals to prevent the face from collapsing, it will incur significant costs.

Conventionally, in such a case, a method has been adopted in which the agitator 5 provided near the suction port 2 of the earth discharge pipe 1 in the bulkhead 3 is used to dislodge the clod 4 that has blocked the suction port 2.

In other words, the hope was that the clod would break and become smaller after being swept away several times.

However, the highly cohesive clay does not shrink easily and is left behind in the bulkhead 3 one after another, eventually accumulating and making it impossible to excavate as described above.

The present invention was developed in view of the above circumstances, and its purpose is to remove soil by cutting off the clod with the blade of the cutter device when the suction port of the soil removal pipe is clogged with soil. The objective is to make the excavation smooth and eliminate the impossibility of excavation, and to make it economical by eliminating the need for equipment such as an agitator and its accompanying power unit.

Hereinafter, the present invention will be explained with reference to FIG. 5 and subsequent figures. In the drawing, 10 is a shield body, and 11 is a cutter head.

A cut head support 1 is attached to the shield body 10.
2 is provided, and this cut head support 12
An inner ring 31 of the bearing 13 is fixed to the bearing 13, an outer ring 14 of the bearing 13 is connected to a connecting member 16 via a ring member 15, and the connecting member 16 is connected to the cutter head 11. An earth removal pipe 17 is attached to the cutter head support 12.
The suction port 18 of 7 opens into the bulkhead 19. Further, a sludge removal reserve pipe 20 is attached to the cutter head support 12, and a suction port 21 of the sludge removal reserve pipe 20 opens into the bulk head 19.

The suction port 18 of the mud removal pipe 17 and the suction port 21 of the mud removal reserve pipe 20 are located on a locus circle p centered on the center 0 of the shield body 10.

A drive motor 22 is attached to the cutter head support 12, and a pinion 23 at the end of the output shaft of the drive motor 22 meshes with a ring gear 24 of the outer ring body 14 of the bearing 13.

Connecting member 1 connected to the cutter head 11
6, a plurality of cutter devices 25 are attached at predetermined intervals in the circumferential direction and positioned on the trajectory circle p.

As shown in FIG. 7, the cutter device 25 has a plurality of blades 27 formed on a base portion 26 with gaps 28 in the radial direction of the cutter head 11. There are various shapes as shown in FIGS. 11 to 11, and the planar shape of the blade 27 as shown in FIGS. 12 to 14.

The cutter head 11 is rotated by the rotational drive of the drive motor 22, the cutter 30 provided on the cutter head 11 excavates the face, and the excavated earth and sand is taken into the bulkhead 32.

The taken-in sediment is transferred from the suction port 18 to the sludge pipe 17
It is sucked inside and transported backwards.

The cutter device 2 is rotated by the rotation of the cutter head 11.
5 is moving on the trajectory circle p.

Therefore, when the suction port 18 is clogged with the clod A, the blade 27 of the cutter device 25 cuts the clod A to a size smaller than the inner diameter of the mud removal pipe 17.

This eliminates clogging of the suction port 18 by the clod A.

As detailed above, the present invention has a shield main body 1.
The shield body 10 is placed inside the bulkhead 32 inside the shield body 10.
The suction port 18 of the mud removal pipe 17 is opened, and the cutter head 1 is positioned on the locus circle p centered on the center 0 of
A plurality of cutter devices 25 are provided on the back of the cutter 1 at predetermined intervals in the circumferential direction and positioned on the trajectory circle p,
This is a device for preventing clogging of a mud drain pipe in a mud water pressurizing shield, characterized in that the blade body 27 of the cutter device 25 is made to protrude toward the suction port 18 side.

Therefore, there is a clod A at the suction port 18 of the mud removal pipe 17.
If the clod A becomes clogged, the rotation of the cutter head 11 causes the blade 27 of the cutter device 25 to cut the clod A into small pieces.

Therefore, the earth is removed smoothly, excavation is not impossible, and a separate device such as an agitator and associated equipment such as a power unit are not required, which is economical. Moreover, unlike an agitator, no additional space is required, and even a small-diameter shield (3 m or less) can be installed.

[Brief explanation of the drawing]

Figures 1 and 2 are explanatory diagrams of clogged sludge pipes due to clods of soil, Figure 3 is a side view of a conventional sludge pipe clogging prevention device, Figure 4 is a view taken from the direction of Figure 3, and Figure 5 is a longitudinal sectional view of a muddy water pressurizing shield equipped with a mud drain clogging prevention device according to the present invention, Figure 6 is a sectional view taken along the line shown in Figure 5, and Figure 7 is an enlarged view of the part in Figure 5. , FIG. 8 to FIG. 11 are explanatory diagrams of the cross-sectional shape of the blade body, FIG. 12 to FIG. 14 are explanatory diagrams of the planar shape of the blade body, and FIG. 15 is a cross-sectional diagram along the line of FIG. 7. . 10 is the shield body, 11 is the cut head, 1
7 is a mud removal pipe, 18 is a suction port, 25 is a cutter device,
27 is the blade body.

Claims (1)

[Scope of utility model registration request] The suction port 18 of the mud removal pipe 17 is opened in the bulk head of the shield body 10 at a position on the trajectory circle p centered on the center 0 of the shield body 10, and the suction port 18 of the mud removal pipe 17 is opened at the back of the cutter head 11 on the trajectory circle p centered on the center 0 of the shield body 10. Prevention of mud drain pipe clogging in a muddy water pressurizing shield, characterized in that a plurality of cutter devices 25 are provided at predetermined intervals in the circumferential direction, and the blades 27 of the cutter devices 25 are made to protrude toward the suction port 18 side. Device.