JPH0137036Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a device for preventing blockage of a soil improvement material injection port in a shield excavator.

Normally, an inlet for injecting lubricant is provided on the outer peripheral wall of the shield excavator main body to reduce digging resistance, and when the shield excavator is a slurry type, the inner peripheral wall of the pressure chamber and earth removal device is provided with an inlet for injecting lubricant to reduce digging resistance. , an inlet for slurry injection is provided. Conventionally, the injection ports for soil improvement materials such as lubricant and slurry were simply opened in the wall surface, so there were cases where earth and sand flowed into the injection ports and caused them to become clogged. Therefore, every time the injection port becomes blocked, excavation must be stopped and the blocked earth and sand must be removed using a stick, and depending on the location of the injection port, it may not be possible to remove the earth and sand, making it difficult to carry out construction work. It had the disadvantage of causing problems.

Therefore, it is an object of the present invention to provide a device for preventing clogging of a soil conditioner injection port that can eliminate the above-mentioned drawbacks. covered with a valve body made of a flexible material, provided with radial notches in the valve body, and provided with a pressure receiving plate having a plurality of openings for passage of soil improvement material and supporting the inner surface of the valve body on the injection port side, And the radial notch of the valve body,
According to this configuration, a plurality of openings are provided in accordance with the number of openings for passage of soil improvement material in the pressure receiving plate.
Since the soil improving material can be injected outward from the wall surface and earth and sand can be prevented from entering from the outside, the injection port is no longer blocked by earth and sand as in the past, and excavation work can be carried out without any trouble.

Hereinafter, one embodiment of the present invention will be described based on the drawings. In Fig. 1, reference numeral 1 denotes, for example, a slurry-type shield excavator, in which a cutter head 3 is rotatably supported at the front part of the shield body 2 via a bearing 4, and a cutter head 3 is provided with a cutter head 3 for taking in excavated soil. A pressure chamber 5 is formed therein, and a ribbon screw-type soil removal device 8 for conveying the excavated earth and sand in the pressure chamber 5 to the atmospheric pressure chamber 7 side is provided on the rear partition wall 6 of the pressure chamber. Note that 9 is a rotational drive device for the cutter head 3;
10 is a rotational drive device for the ribbon-shaped screw blade 11. In the skin plate 2a of the shield body 2, the face plate 3a of the cutter head 3, the inclined inner wall 3b of the pressure chamber 5, and the rear partition wall 6 of the pressure chamber, an injection port 12 for a soil improving material such as a lubricant or slurry is formed. At the same time, injection pipes 13 for soil conditioner are connected to these injection ports 12, and the injection ports 12 are provided with a blockage prevention device 14 according to the present invention. As shown in FIGS. 2 and 3, the blockage prevention device 14 is attached to an annular recess 15 formed on the outer surface of the injection port 12 via a retaining ring 16, and has a plurality of radial notches in the center. A valve body 18 made of a flexible material (urethane rubber, natural rubber, resin, etc.) is provided with a notch 17 located on the inner surface of the valve body 18 on the injection port 12 side.
Pressure receiving plate 19 supporting flexible portion 18a between 7 and 17
It is composed of. Of course, the pressure receiving plate 19 is provided with a plurality of openings 19a for passage of the soil conditioner, depending on the number of flexible portions 18a. In addition, in FIGS. 2 and 3, the flexible portion 18a is
Although the number of pieces is shown, the number is not limited to four, and the number may be three or five or more, for example. Further, the flexible portion 18 of the valve body 18
a is sloped so as to protrude outward from the periphery toward the tip of the central portion of the valve body 18. Therefore, by applying an external force, that is, earth pressure, to the flexible portions 18a, the adhesion between the flexible portions 18a is improved. In addition, 20 is the valve body 18 and the pressure receiving plate 19
This is a bolt for fixing.

According to the above configuration, when the soil improving material is supplied from the injection port 12 through the injection pipe 13, the soil improving material pushes the flexible portion 18a of the valve body 18 outward, and
For example, even if the valve body 18 is injected into the ground and an external force such as earth pressure acts on the injection port 12, the flexible portion 18a is maintained in its closed state by the pressure receiving plate 19. Earth and sand will not flow into the injection port 12.

In the above embodiment, the flexible portion 18a is inclined, but as shown in FIG.
The flexible portion 18'a may be made horizontal, and as shown in FIG. It may also be screwed onto the inlet 12'.

[Brief explanation of drawings]

Figures 1 to 3 show an embodiment of the present invention, in which Figure 1 is an overall vertical cross-sectional view, Figure 2 is a plan view of the main part, and Figure 3 is a cross-sectional view taken along the - arrow in Figure 2. , 4 and 5 are sectional views of main parts of other embodiments. 1...Shield excavator, 2...Shield body,
12, 12'...Injection port, 13...Injection pipe, 14
... Blockage prevention device, 15 ... Annular recess, 16 ...
Holder ring, 17...notch, 18...valve body, 1
8a, 18'a... Flexible portion, 19, 19'... Pressure receiving plate, 19a... Opening.

Claims (1)

[Scope of utility model registration request] The injection port for the soil conditioner, which is opened in the wall surface, is covered with a valve body made of a flexible material, and the valve body is provided with radial notches, and has a plurality of openings for passing the soil conditioner. A soil improvement material inlet, characterized in that a pressure receiving plate is provided to support the inner surface on the injection port side, and a plurality of radial notches in the valve body are provided in accordance with the number of soil improvement material passage openings in the pressure receiving plate. anti-occlusion device.