JPS6338315Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a cutter for cutting gravel layers, etc. of a shield machine used when excavating a shield tunnel etc. prior to laying a power cable.

[Technical background of the invention]

Shield construction methods are often adopted for laying power cable pipes, etc., and in this case, shield machines are used to excavate shield tunnels, etc.

The cutting cutters for this shield machine are Drum Deitzger type, Moscow type, Robins type, or SVM40 type, depending on the nature and hardness of the soil or layer in the area to be excavated, that is, the soil quality.
Many types are available, including type (for bedrock).

[Problems with background technology]

When using the conventional cutting cutter mentioned above, when cutting the type of soil to be cut, that is, sandy soil mixed with boulders and gravel, for example, the blade is severely damaged and worn, requiring frequent replacement of the blade, which requires cutting work each time. This reduces work efficiency and increases replacement costs.

[Purpose of invention]

The present invention was made based on the above circumstances, and uses piano wire, which is cheaper than conventional ones, as a cutter, and when the piano wire becomes worn out, it can be used by feeding it out to the tip one after another. This aims to eliminate replacement costs and reduce the labor and time required for replacement.

[Summary of the idea]

The present invention includes a frame provided at one end of the rotating drum,
a removable member that is removably attached to the frame;
This cutting cutter for a shield machine is characterized in that it has a piano wire that is inserted into the frame through the detachable member and whose length of protrusion to the outside of the frame can be adjusted.

[Example of idea]

FIG. 1 is a perspective view of a cutting cutter according to the present invention;
FIG. 2 is a sectional view taken along the line A--A in FIG. 1, and FIG. 3 is a longitudinal sectional view of the wedge. In these figures, the rotating drum 1 is connected to a shield machine (not shown).
It is attached to the drive unit and rotated at a predetermined speed. A frame 3 is fixed to one end of the rotating drum 1 with a spacer 2 in between and a bolt 4.

The frame 3 is provided with a through hole 5 in its outer periphery and a connecting portion 3a continuous to its center, and a wedge-shaped opening 6 is formed on the back side of the frame 3 to coincide with the axis of the through hole 5. has been done.

A wedge 8 through which a piano wire 7 is inserted is fixed to the opening 6. As shown in FIG. 3, this wedge 8 is composed of two wedge pieces 8a and 8b that are symmetrically divided with respect to the axis. Therefore, by driving the piano wire 7 into the wedge-shaped opening 6 with the wedge pieces 8a and 8b narrowing the piano wire 7, the piano wire 7 is strongly held between the wedge pieces 8a and 8b, and the piano wire 7 is It will be fixed.
Further, the tip end of the piano wire 7 is inserted into the through hole 5 of the frame 7 and led out of the frame 3.

The piano wire 7 is selected to have a wire diameter of about 3 to 10 mm depending on the soil quality, and the protruding length L from the frame body 3 is also adjusted depending on the soil quality to be cut.

In the above configuration, if the piano wire 7 becomes worn due to cutting hard soil, gravel layer, etc., tap the back side of the frame 3 with a hammer, loosen the fixation of the wedge 8 to the opening 6, and remove the wedge 8. Wedge piece 8a, 8
Divide b. Thereafter, the piano wire 7 is made to protrude by a predetermined amount, the wedge pieces 8a and 8b are used to narrow the piano wire 7 again, and the piano wire 7 is driven into the opening 6 for use. Note that the method of fixing the piano wire 7 is not limited to the above method; for example, the position of the end of the piano wire 7 may be restricted by appropriate means to prevent it from moving backwards. Needless to say, it's a good thing.

[Effect of idea]

In this invention, the cutter is made of piano wire as described above, and when the piano wire is worn out, it can be used by protruding by a predetermined amount.
In addition to significantly reducing the cost of replacing stubs,
The adjustment work is also easy, and the time and labor required to replace the cutters can be reduced, making it possible to perform highly efficient cutting work.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a cutting cutter for a shield machine according to the present invention, FIG. 2 is a sectional view taken along the line A--A in FIG. 1, and FIG. 3 is a longitudinal sectional view of the wedge. 1... Rotating drum, 2... Spacer, 3... Frame, 4... Bolt, 5... Through hole, 6... Wedge-shaped opening, 7... Piano wire, 8... Wedge.

Claims (1)

[Claims for Utility Model Registration] (1) A frame provided at one end of the rotating drum, a detachable member detachably provided to the frame, and a frame inserted into the frame via the detachable member, A cutter for cutting a shield machine, characterized in that it has a piano wire whose protrusion length to the outside of the frame can be adjusted. (2) The cutting cutter for a shield machine according to claim 1, wherein the detachable member is a wedge.