JPS6156758B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for burying a pipe, and particularly to a device for burying a small diameter pipe.

Currently, when burying prefabricated pipes with a diameter of 800 mm or less, instead of the conventional cut-and-cover method, the mainstream method is to use a propulsion method that propels the buried pipe itself using a propulsion device, such as a hydraulic cylinder, installed in the starting pit. There is.

This propulsion method includes a consolidation method in which the rear part of the buried pipe is simply pushed and the soil at the tip of the buried pipe is consolidated while the pipe is propelled, and an auger installed inside the buried pipe is driven by a drive device in a starting pit. There is an auger method that rotates and excavates the soil at the tip of the buried pipe while pushing the rear part of the buried pipe. The consolidation method is used especially when the ground is soft, but it requires a huge force as a propulsion force, and a large force acts on the buried pipe, which can easily cause damage to the buried pipe. The directional accuracy is not good because the material is shifted from the position where it should be buried. In addition, in the auger method,
Every time a subsequent buried pipe is added, it is necessary to add an auger, which makes the work complicated.

This invention was made to solve the above-mentioned problems, and it requires only a small propulsion force, prevents damage to buried pipes, has good directional accuracy, and can be managed easily. The purpose is to provide installation equipment.

In order to achieve this purpose, in this invention, a vibrating excavation device that vibrates in a direction perpendicular to the center line of the buried pipe is provided at the top of the buried pipe, and a liquid supply port is provided on the vibratory excavation device. A propulsion device for pushing the rear part of the buried pipe is provided in the starting pit.

FIG. 1 is a diagram showing a pipe burying device according to the present invention;
FIG. 2 is a sectional view showing a part of the pipe burying device shown in FIG. 1, and FIG. 3 is a sectional view taken along the line AA in FIG.
In the figure, 1 is the earth, 2 is a starting pit provided in the earth 1, 3 is a hydraulic cylinder which is a propulsion device provided in the starting pit 2, 4 is a buried pipe, and the rear part of the buried pipe 4 is It is pushed by the hydraulic cylinder 3. 5 is a vibration excavation device installed at the top of the buried pipe 4, 6 is an exciter installed inside the vibration excavation device 5, 7 is an eccentric shaft of the exciter 6, and 8 is a rotating eccentric shaft 7. 9 is a vibration excavation device 5 for
The vibration isolator 9 is a vibration isolator provided between the pipe 4 and the buried pipe 4. The vibration isolator 9 blocks vibrations (15 lateral vibrations) perpendicular to the center line of the pipe and transmits force in the direction of the center line. 10 is a liquid supply port provided at the tip of the vibrating excavation device 5; 11 is a liquid supply hose that connects the liquid supply port 10 with a liquid supply port device (not shown) provided in the starting pit 2; and 12; is a slurry reservoir provided in the starting pit 2.

In this pipe burying device, when the electric motor 8 is rotated, the eccentric shaft 7 of the exciter 6 is rotated, so that the centrifugal force of the eccentric shaft 7 causes the vibration excavation device 5 to move as shown in FIGS. 4a to 4d. The center O ₁ vibrates in a direction perpendicular to the center line O ₂ of the buried pipe 4 . That is, the center O ₁ revolves around the center line O ₂ . Further, if a liquid such as water is supplied to the liquid supply port 10 via the liquid supply hose 11, the water is supplied to the tip of the vibrating excavation device 5. For this reason, vibration is applied to the ground 1 near the tip of the vibration excavation device 5, which disturbs the arrangement of the soil particles in the ground 1, making it easier for the soil particles to move among themselves, and allowing water to penetrate between the soil particles. from,
The strength of the ground 1 decreases, and the ground 1 near the tip of the vibratory excavation device 5 is mixed with water by the vibration of the vibratory excavation device 5, and rapidly becomes slurry. Furthermore, when the center O ₁ of the vibration excavation device 5 revolves,
As shown in FIG. 4, a gap e is formed between the vibrating excavation device 5 and the ground 1, and a gap e is also formed between the buried pipe 4 and the surrounding ground 1. , the slurry 13 formed near the tip of the vibrating excavation device 5 flows into the starting pit 2 through the gap e;
The slurry is collected in the slurry reservoir 12. In this way, since the slurry 13 is formed near the tip of the vibrating excavation device 5, the penetration resistance is drastically reduced, and the slurry 13 is
3 is a vibration excavation device 5, a buried pipe 4 and the surrounding ground 1
Because it flows out through the gap e between
Circumferential surface resistance such as adhesive force can be reduced to almost zero. Therefore, the driving force applied to the rear part of the buried pipe 4 can be reduced.

Note that the liquid discharged from the liquid supply port 10 is as follows:
If the soil to be propelled is mainly fine-grained soil, water can be used, but if the soil is mainly coarse-grained soil, it is better to use bentonite solution.
The slurry 13 is smoothly formed into a slurry and the slurry 13 flows out to the starting pit 2 side.

As explained above, in the pipe burying device according to the present invention, compared to the consolidation method, the propulsive force applied to the rear part of the buried pipe is small, and the force acting on the buried pipe is small. The buried pipe will not be damaged, the diameter of the pipe that can be buried can be increased, and the directional accuracy is also good. Furthermore, compared to the auger method, there is no need to perform other work when adding buried pipes, so the work efficiency is high and the equipment is simple. As described above, the effects of this invention are remarkable.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a pipe burying device according to the present invention;
Fig. 2 is a sectional view showing a part of the pipe burying device shown in Fig. 1, Fig. 3 is a sectional view taken along line A-A in Fig. 2, and Fig. 4 is a sectional view of the pipe shown in Figs. 1 to 3. It is an explanatory diagram of the operation of the burial device. 1... Earth, 2... Starting pit, 3... Hydraulic cylinder, 4... Buried pipe, 5... Vibratory excavation device,
6...Exciter, 10...Liquid supply port, 11...Liquid supply hose.

Claims (1)

[Claims] 1. A vibrating excavation device that vibrates in a direction perpendicular to the center line of the buried pipe is installed at the top of the buried pipe,
A pipe burying device characterized in that the vibration excavation device is provided with a liquid supply port, and a propulsion device for pushing the rear part of the buried pipe is provided in the starting pit.