JPS6131105Y2 - - Google Patents

Description

[Detailed description of the invention] The invention relates to a shield tunneling machine,
The purpose is to prevent as much as possible the abrasive wear of the parts that slide in contact with earth and sand.

The skin plate that makes up the outer shell of the shield excavator and the cutter head installed on the front of it are
Due to their propulsion or rotation, they come into contact with the earth and sand in the ground and slide, resulting in severe abrasion and wear in that area. Conventionally, in order to reduce this abrasive wear, the hardness of the steel used in the parts that come into contact with earth and sand has been increased, or hardfacing welding has been applied to the steel. The countermeasures were not satisfactory in terms of durability, economy, etc.

The present invention has been devised in view of the above, and embodiments thereof will be described below with reference to FIGS. 1 to 4.

In FIGS. 1 and 2, 1 is a cylindrical skin plate constituting the shield body, and 2 is a cutter head provided on the front surface of the skin plate 1. A cutter head drive motor 3, a continuous earth removal device 4, etc. are installed inside the skin plate 1, and the cutter head 2 is provided with a cutter slit 5 for taking excavated earth and sand into the machine, a cutter bit 6 for excavation, etc. In the case of such a shield excavator, the skin plate 1 is propelled by a shield propulsion jack (not shown) while the cutter head 2 is rotated by driving the drive motor 3, and the earth excavation is carried out by the earth removal device 4. Excavation is carried out by continuously removing earth and sand. Therefore, the outer surface of the skin plate 1, the outer peripheral surface and front surface of the cutter head 2, and various components installed inside the machine, such as the inner surface of the casing of the earth removal device 4, come into contact with the ground 7 or the excavated soil and slide. do. On the other hand, all of the above elements are made of steel. In this embodiment, as shown in FIG. 3 or 4,
A lining 9 is provided on the surface of these steel materials 8. That is, in the case shown in FIG. 3, an elastic material such as a synthetic rubber plate 10 is attached to the outer edge surface of the cutter slit 5 in the steel material 8 constituting the front plate of the cutter head 2, and the synthetic rubber plate 10 is
A large number of ceramic mosaics 11 are lined up and embedded inside. Further, in the case shown in FIG. 4, a ceramic welding material 12 is applied directly to the surface of the steel material 8. Which of these should be adopted should be selected appropriately, taking into account various conditions.

Parts A and B with a checkered pattern in Figure 1
The figure shows the worn parts of the shield tunneling machine used for actual excavation. Therefore, in this type of shield excavator, the above-mentioned parts A,
By providing B with a ceramic lining, abrasive wear on the steel surface can be minimized.

Ceramic has high hardness and therefore has great sliding durability, so using it as a lining material is effective as a countermeasure against abrasive wear. As shown in FIG. 3, if a lining 9 of ceramic mosaic 11 is provided through a synthetic rubber plate 10, the synthetic rubber plate 10 acts as a cushioning material against impact, thereby preventing abrasion and impact. Effective in preventing wear. Therefore, it is effective as a countermeasure when excavating gravel and cobblestone layers. If the intention is only to prevent abrasive wear, the one shown in FIG. 4 is effective. Although FIG. 2 has been described with reference to only the cutter head, it is effective to apply a similar lining to the skin plate 1 and other parts that slide in contact with earth and sand. For example, soil removal device 4
This applies to parts that slide in contact with the earth and sand of the screw conveyor that makes up the system, as well as pump parts and pipes for slurry transportation in the case of the muddy water pressure shield.

As is clear from the above description, according to the present invention, since ceramic with high hardness is used as the lining material, it can be an effective countermeasure against abrasion and wear. In particular, by lining the surface of the steel material with ceramic mosaic through an elastic material such as synthetic rubber, it has excellent impact resistance as well as abrasion resistance against earth and sand.

[Brief explanation of the drawing]

Figures 1 to 4 show an embodiment of the present invention, where Figure 1 is a partially cutaway external perspective view of a shield tunneling machine, Figure 2 is a vertical side view of the shield tunneling machine, and Figure 3 is a vertical side view of the shield tunneling machine. FIG. 4 is an enlarged sectional view of the main part, and FIG. 4 is an enlarged sectional view of a modification. 1... skin plate, 2... cutter head, 4... soil removal device, 7... earth, 8... steel material,
9...Lining, 10...Synthetic rubber plate, 11...
...Ceramic mosaic, 12...Ceramic melting material, A, B...Abraded and worn parts.

Claims (1)

[Scope of utility model registration request] A shield excavator characterized in that a ceramic lining is applied directly or indirectly to the surface of a steel material that slides in contact with earth and sand.