JPS5836718B2 - Earth clogging prevention device for shield excavator connection part - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a shield excavator, particularly a small Nikkei
The present invention relates to a soil clogging prevention device for a connecting part in an excavator that has a multi-divided structure including an excavating part, a power part, and a lining part, such as a so-called small-section shield.

In the conventional excavation method for a small cross-section shield, as shown in FIG. packet 11
This is transmitted to the front cutter 4, and the rotation of this cutter 4 excavates the front ground.

When digging, the shield jack 5 is rotated at the same time as the cutter 4.
is extended, and the excavation part A is advanced while taking a reaction force to the end face of the power part skin plate 2.

FIG. 1B shows a state in which the shield jack 5 is fully extended and digging has been completed.

At this time, an overlapping portion 8a between the power skin plate 2 and the excavation portion skin plate 1 into which the distal end of the power skin plate 2 is fitted is exposed to the ground.

Next, a reaction force is applied to the constructed lining 7, and the lining part skin plate 3 is advanced together with the power part skin plate 2 by the jack 6 of the lining part C, and as shown in FIG.
As shown in , the relative positional relationship with the excavated part skin plate 1 is returned to the original state.

The above is a series of work cycles in shield excavation, and by repeating this work cycle, the lining 7 is constructed underground.

However, when excavation is repeated in the above-mentioned work cycle, soil accumulates in the overlap part 8a, and even if the power part B is pushed by the jack 6 of the lining part C, the axis of the excavation part skin plate 1 and the power part skin plate 2 is The gap in the direction gradually increases, reducing the required digging distance of the excavator by 1.
It had the disadvantage that it could not be pushed in one turn and had to be dug several times.

Furthermore, it has been impossible to remove such clogged earth from the inside using conventional construction methods.

The present invention aims to prevent soil from clogging at the connecting portion of the shield excavator and to obtain smooth excavation in the shield excavator, and the present invention has a structure in which:
The power section skin plate is divided into ring shapes, and a rotatable divided skin plate is provided, and at least one piece of soil is provided at the rear end of the excavation section skin plate into which the tip of the divided skin plate is fitted. It is characterized by the provision of a scraping blade.

Hereinafter, the present invention will be explained in detail based on the drawings.

FIG. 2 is a partial sectional view of an apparatus showing an embodiment of the present invention, in which A is an excavation section, B is a power section, 1 is an excavation-like skin plate, and 2 is a power skin plate.

The tip of the power section skin plate 2 is divided into a ring shape, and a divided skin plate 13 is provided.
4, and the split skin plate 13 is rotatable.

The leading end of the divided skin plate 13 is fitted to the rear end of the excavation part skin plate 1 to form an overlap part 8b, and at least one piece (in FIG. A soil scraping blade 15 (one piece) is provided.

As is clear from FIG. 3, the rotation of the split skin plate 13 is caused by the rotation of the motor 9b provided in the power unit B being transmitted to the pinion 10b, and the rotation of the pinion 10b and the internal gear 1.
2b mesh with each other, and the internal gear 12b rotates the split skin plate 13.

As the excavation is repeated, soil gradually begins to accumulate in the overlap part 8b formed between the excavation part skin plate 1 and the power part skin plate 2, and as the power part skin plate 2 moves forward, the depositor 16 is compressed. and is fixed to the surface of the power section skin plate 2.

In order to remove this accumulated soil 16, the device of the present invention gradually pushes the power section skin plate 2 forward using the jack 6 (not shown in FIGS. 2 to 4) of the lining section C, and also turns on the motor 9b. This rotation causes the small gear 10b to rotate.
1 internal gear 12b and further to the divided skin plate 13, and finally, the accumulated soil 16 is transferred to the rotation of the divided skin plate 13 and at least one soil provided at the rear end of the excavation part skin plate 1. It is scraped off by the scraping blade 15.

The piled soil 16 that has been scraped away will escape between the power section skin plate 2 and the ground, but in order to further expect this effect, the outer diameter of the power section skin plate 2 should be adjusted to match the excavation section. It is better to make it slightly smaller than the outer diameter of the skin plate 1.

As explained above, the present invention provides a rotatable split skin plate and at least one soil shoveling blade at the rear end of the excavation section skin plate.
When using a shield excavator to dig a tunnel over a long distance underground, the soil that accumulates on the skin plate can be easily removed, which prevents soil from clogging the excavator joint and allows for smooth and smooth tunneling. It has the advantage of obtaining rapid excavation.

Note that the device of the present invention is applicable not only to a shield excavator, but also as a device for preventing soil clogging in underground sedimentation pipes and the like.

[Brief explanation of the drawing]

FIGS. 1A to 1C are cross-sectional views showing excavation and excavation procedures in a conventional shield excavation method, particularly a small-section shield excavation method, and FIGS. 2 to 4 are views showing an embodiment of the present invention. 2 is a partial sectional view, FIG. 3 is a view taken along the line X--X in FIG. 2, and FIG. 4 is a plan view of FIG. 2. In the drawings, 1 is an excavation part skin plate, 2 is a power part skin plate, 3 is a lining part skin plate, 4 is a cutter, 5 is a shield jack, 6 is a jack, 7 is a lining, 8a, sb are overlap parts, 9a, 9b is a motor, 10a, 10b are small gears, 11 is a cutter packet, 12a, 12b are internal gears, 13 is a split skin plate, 14 is a sliding surface, 15 is a soil scraper, 16 is piled soil, A is an excavation part , B is a power section, and C is a lining section.

Claims (1)

[Claims] 1 At the tip of the power section skin plate, a split skin plate is provided, which is made by dividing the power section skin plate into a ring shape and is rotatable, and an excavation section skin plate into which the tip of the split skin plate is fitted. A device for preventing soil clogging of a connecting portion of a shield excavator, characterized in that at least one soil shoveling blade is provided at the rear end.