JPS6156757B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and apparatus for burying pipes, and particularly to a method and apparatus for burying small diameter pipes.

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 in order to solve the above-mentioned problems, and it is a pipe burying method and apparatus that requires a small propulsion force, does not cause damage to the buried pipe, has good directional accuracy, and is easy to work with. The purpose is to provide

In order to achieve this object, the present invention vibrates the front end of the buried pipe and applies a propulsive force from the rear of the buried pipe. Further, in order to carry out this method, a vibrating excavation device is provided at the top of the buried pipe, and a propulsion device for pushing the rear part of the buried pipe is provided in the starting pit.

That is, in the pipe burying method according to the present invention, the leading end of the buried pipe is vibrated in a direction perpendicular to the center line of the buried pipe (horizontal direction) or in the same direction as the center line (vertical direction), and Propulsive force is applied from the rear of the buried pipe. In this case, since vibrations are applied to the ground near the tip of the buried pipe, the arrangement of soil particles in the ground is disturbed, the soil particles tend to move among themselves, and the strength of the ground is reduced. Therefore, even if the thrust is small, it is possible to propel the buried pipe.

In addition, as shown in Fig. 1, when the leading part 1 of the buried pipe is vibrated in the lateral direction and the axis O of the leading part 1 is made to revolve, the leading part 1 A space ε is formed between the ground and the ground 2. For this reason, a gap ε is formed between the buried pipe and the surrounding ground 2, and the resistance force due to the friction of the ground 2 acting on the buried pipe is significantly reduced.
The propulsive force applied to the rear part of the buried pipe can be further reduced. That is, when the leading part 1 of the buried pipe is vibrated in the lateral direction, the strength of the ground 2 near the tip of the leading part 1 can be reduced, and the friction of the ground 2 acting on the buried pipe can be reduced. Since the drag force can be reduced, the propulsive force can be made very small.

FIG. 3 is a diagram showing a pipe burying device according to the present invention;
FIG. 4 is a sectional view showing a part of the pipe embedding device shown in FIG. 3. In the figure, 3 is a starting pit provided in the earth 2, 4 is a hydraulic cylinder which is a propulsion device provided in the starting pit 3, and 5 is a buried pipe.
The rear part of the buried pipe 5 is pushed by a hydraulic cylinder 4. 6 is a vibration excavation device installed at the tip of the buried pipe 5; 7 is a main body of the vibration excavation device 6; 8
9 is the exciter installed in the main body 7, and 9 is the exciter 8.
10 is an electric motor for rotating the eccentric shaft 9, 11 is a power supply line for the electric motor 10, and the power supply line 11 is connected to a power source (not shown) in the starting pit 3.

In this pipe burying device, when the electric motor 10 is rotated, the eccentric shaft 9 of the exciter 8 is rotated, so that the centrifugal force of the eccentric shaft 9 causes the main body 7 of the vibration excavation device 6 to rotate.
vibrates in the lateral direction, and the axis of the main body 7 revolves. For this reason, the strength of the ground 2 near the tip of the vibratory excavation device 6 is reduced, and a gap is formed between the vibratory excavation device 6 and the buried pipe 5 and the ground. The frictional resistance force of the ground 2 acting on the buried pipe 5 becomes extremely small. Therefore, by applying a small propulsion force to the rear part of the buried pipe 5 using the hydraulic cylinder 4, the buried pipe 5 can be propelled.

In the above-mentioned embodiments, a pipe burying device having a vibratory excavation device that generates vibrations in the lateral direction is described. Since the strength of the ground can be reduced, the buried pipe 5 can be propelled by applying a small propulsion force to the rear part of the buried pipe 5 using the hydraulic cylinder 4.

As explained above, in the pipe burying method and device according to the present invention, compared to the consolidation method,
The driving force applied to the rear part of the buried pipe is small;
Furthermore, since the force acting on the buried pipe is small, the buried pipe will not be damaged, and furthermore, the directional accuracy is 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]

1 and 2 are explanatory diagrams of the pipe burying method according to the present invention, FIG. 3 is a diagram showing a pipe burying device according to the present invention, and FIG. 4 is an illustration of the pipe burying device shown in FIG. 3. FIG. 1... Leading part, 2... Earth, 3... Starting pit, 4... Hydraulic cylinder, 5... Buried pipe, 6...
... Vibratory excavation device, 8... Exciter.

Claims (1)

[Claims] 1. Vibrating the leading part of the buried pipe,
A method for burying a pipe, characterized in that a propulsive force is applied from the rear of the pipe to be buried. 2. The pipe burying method according to claim 1, wherein the direction of the vibration is substantially perpendicular to the center line of the buried pipe. 3. A pipe burying device, characterized in that a vibrating excavation device is provided at the head of the buried pipe, and a propulsion device for pushing the rear part of the buried pipe is provided in a starting pit. 4. The pipe burying device according to claim 3, wherein the vibration direction of the vibration excavation device is substantially perpendicular to the center line of the buried pipe.