JPS6117110Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a leading device for a pipe burying machine that excavates a small-diameter leading hole when burying pipes underground.

Conventionally, as shown in FIG. 1, this type of pipe burying machine has been designed to sequentially press-fit a lead pipe 3 from a vertical shaft 4 with a jack 5 while digging with a lead device (excavation pilot) 2 equipped with a cutter drum 1. something is proposed.

The above-mentioned leading device is constructed as shown in FIGS. 2, 3, and 4. That is, the support shaft 6 of the cutter drum 1 is connected to a bearing and a reducer box 8 that are swingably supported on the tip side of a cylindrical main body 7, and a hydraulic motor 9 is installed in the bearing and the reducer box 8. The cutter drum 1 is rotationally driven by a hydraulic motor 9. A bracket 10 is provided on the bearing and reducer box 8, and this bracket 10 is attached to the main body 7.
It is connected to a support body 12 that is swingably supported on a spherical partition wall 11, and a rocking body 13 is connected to the support body 12.
are swingably connected, and the swinging body 13 is swingably supported by a spherical seat 14 of the main body 7.
First and second swinging jacks 16 and 17 are fixedly mounted on a mounting body 15 fixed inside the main body 7, with their positions shifted by 90 degrees in the circumferential direction, and each movable part 16a, 17a
are swingably connected to the rocking body 13, and the first,
Movable parts 16a, 1 of second swinging jacks 16, 17
When 7a is expanded or contracted, the cutter drum 1 swings vertically and horizontally. For example, when the movable portion 16a of the first swinging jack 16a is retracted, the cutter drum 1 swings downward by l as shown in FIG. A water pipe 18 is provided in the upper part of the main body 7, and water is injected from a jet 19 into the interior 1a of the cutter drum 1, and earth and sand excavated by the cutter 20 is taken into the cutter drum 1 and turned into slurry. Earth and sand are transported from the slurry pipe 21 toward the shaft 4.

However, in such a leading device, since the cutter drum 1 rotates and swings relative to the main body 7, a gap S is required between the cutter drum 1 and the main body 7.

For this reason, during the excavation process, fluidized earth and sand naturally flows into the main body 7 through this gap S due to water pressure in the soil, etc., and together with the earth and sand taken in from the cutting edge of the cutter drum 1, the amount of intake is increased. This could cause voids to occur around the buried pipes, the slurry pipe 21 could become clogged due to the slurry pipe 21 exceeding its earth and sand transport capacity, and problems such as the inability to propel or a reduction in propulsion speed could occur. .

The present invention was developed in view of the above circumstances, and its purpose is to allow the cutter head to rotate and swing relative to the main body, and to prevent dirt, etc. from flowing into the main body from between the cutter head and the main body. It is an object of the present invention to provide a leading device for burying a pipe.

Embodiments of the present invention will be described below with reference to FIG. 5 and subsequent figures. Note that members that are the same as those in the prior art have the same reference numerals.

Rear end surface 1a facing main body 7 of cutter drum 1
An annular recess 30 is formed in the recess 30, and an annular seal plate 31 is fitted into the recess 30 so as to be slidable in the longitudinal direction.
a is a spherical concave portion centered on the pivot point O of the cutter drum 1, and the front end surface 7b of the main body 7 is a spherical convex portion having the same curvature as the spherical concave portion 31a, and is pivoted by a spring 32. The cutter drum 1 and the seal plate 31 are urged into contact freely, and seals 33 and 34 seal the gap between the cutter drum 1 and the seal plate 31.

However, Katsuta drum 1 and seal plate 3
1 are sealed by seals 33 and 34, and since the seal plate 31 and the main body 7 can swing freely and are in contact with each other with appropriate surface pressure, dirt, etc. can be removed from between the cutter drum 1 and the main body 7. The slurry pipe 21 is blocked without flowing into the main body interior 1a,
It does not make it impossible to dig or reduce the digging speed.

Further, since the seal plate 31 is swingable relative to the cutter drum 1 and swingable along the front surface 7b of the main body 7, the cutter drum 1 can swing and rotate relative to the main body 7.

As described above, the present invention prevents dirt and the like from flowing into the main body 7 from between the cutter drum 1 and the main body 7, and the cutter drum 1 can swing and rotate relative to the main body 7.

[Brief explanation of the drawing]

Figures 1 to 4 are explanatory diagrams of the pipe burying excavator, with Figure 1 being an overall schematic explanatory diagram, Figure 2 being a sectional view of the guiding device, Figure 3 being a front view, and Figure 4 being movable. FIG. 5 is a sectional view showing an embodiment of the present invention, and FIG. 6 is an enlarged sectional view of main parts. 1 is a cutter drum, 7 is a main body, 18 is a water pipe, 21 is a slurry pipe, 31 is a sealing,
32 is a spring.

Claims (1)

[Scope of utility model registration request] A water pipe 18 and a slurry pipe 21 are installed in the main body 7 equipped with a swingable and rotatable cutter head 1, and earth and sand excavated by the cutter head 1 is taken into the main body 7 and mixed with water sent through the water pipe 18 to form a slurry. In a pipe embedding guide device transported by a slurry pipe 21, a seal ring 31 has a spherical recess 31a centered on the pivot point of the cutter head 1 at the rear of the cutter head 1.
is provided slidably in the longitudinal direction, and the front surface 7b of the main body 7 is a spherical convex portion having the same curvature as the spherical concave portion 31a of the seal ring 31. A guide device for embedding a pipe, characterized in that a spring 32 is provided to urge the spherical convex portion 7b into pressure contact.