JPH0160639B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pipe burying device, and more specifically, a hole having a diameter larger than the outer diameter of the excavator main body and the buried pipe is excavated in the ground, and This relates to a pipe burying device that discharges excavated earth and sand into a starting shaft through an annular gap formed between the pipe and the pipe and buries the pipe in the ground.

Currently, in order to bury underground pipes with a diameter of 1000 mm or less, instead of the conventional cut-and-cover method, the mainstream is a propulsion method in which the buried pipe itself is propelled by a pipe propulsion means installed in the starting shaft, such as a hydraulic cylinder. ing.

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 and propelled. This consolidation method is used especially when the ground is soft, but it requires a huge force as a propulsion force, and since a large force acts on the buried pipe, it is likely to cause damage to the buried pipe, and furthermore, it is difficult to pass through the buried pipe. If the cross section is a non-uniform layer, the conduit will shift from the position where it should be buried, resulting in poor directional accuracy.

Therefore, a rotary excavator whose outer diameter is larger than the outer diameter of the excavator and the buried pipe is installed at the front of the excavator, and while the rotary excavator is rotated to excavate the ground, a hydraulic cylinder is used to excavate the underground pipe. A rotary excavation type pipe burying device that is propelled and buried, and a vibrating excavator whose outer diameter is larger than the outer diameter of the excavator body and the buried pipe are installed at the front of the excavator body, and the vibratory excavator is installed at the center of the buried pipe. A newly developed and previously proposed vibration excavation type pipe burying device uses a hydraulic cylinder to propel the buried pipe while excavating the ground by vibrating the pipe in a direction perpendicular to the line.

The above-mentioned rotary excavation method rotates the rotary excavation tool while injecting a viscosity imparting material near the excavation surface, excavates the ground, and at the same time stirs and mixes the excavated soil and the viscosity imparting material, making it a highly viscous liquid mixed soil. The viscous liquid-mixed earth and sand is forced into the starting shaft through an annular gap formed between the excavation hole, the excavator body, and the buried pipe. In addition, the above-mentioned vibration excavation method vibrates the vibrating excavator while injecting a viscosity imparting material near the excavation surface, and uses the vibration to minutely excavate the ground, while at the same time stirring and mixing the excavated soil and the viscosity imparting material by vibration. The soil is a highly viscous liquid mixture, and the viscous liquid mixed earth and sand is forced into the starting shaft through an annular gap formed between the excavation hole, the excavator body, and the buried pipe.

The above-mentioned pipe burying equipment has a small diameter and there is no area to install an earth removal device inside the pipe, so the excavated soil is not taken into the excavation machine body and discharged immediately after excavation, and the outer diameter is The outside of the excavating machine body and buried pipes can be removed by using an excavating tool (a rotating excavating tool installed at the front of the excavating machine body or a vibrating excavating tool installed at the front part of the excavating machine body) that is larger than the outside diameter of the excavating machine body and the buried pipe. An annular gap formed between the excavation hole having a diameter larger than the diameter of the excavation machine and the excavation machine body and the buried pipe is used as a passage. The slurry of viscous liquid mixed earth and sand is discharged into the starting shaft. The annular gap also has the effect of reducing the frictional resistance between the earth, the excavator main body, and the buried pipe, thereby reducing the propulsive force.

However, in the above-mentioned pipe burying device, the excavator body is floating in the viscous liquid mixed earth and sand, so if the soil quality of the ground is uneven, the excavator body may bend toward the side with weaker resistance. Put it away. In addition, the weight of the excavator itself and the buried pipe and the specific gravity of the viscous liquid mixed earth and sand rarely match, so if the weight is greater than the buoyancy, the excavation machine will move downward, and if the buoyancy is greater than its own weight, it will continue digging. The body of the aircraft bends as each force is applied upwards. Therefore, the above-mentioned pipe embedding device has a problem of poor straightness.

The present invention aims to provide a pipe embedding device that solves the above-mentioned problems.

The present invention is characterized in that a convex portion is provided on the outer circumferential side of the excavator main body in a radial direction that is equal to or slightly larger than the outer diameter of the excavator.

Hereinafter, two of the embodiments of the pipe embedding device of the present invention will be described with reference to the accompanying drawings.

1 to 3 show an embodiment of the pipe burying device of the present invention, FIG. 1 is a schematic diagram of the entire pipe burying device of the present invention, FIG. 3
The figure is a sectional view taken along the - line in FIG. 2.

The pipe burying device of the present invention in this embodiment is an example used in a vibration excavation method, and the outer diameter is larger than the outer diameter of the excavator main body 9 and the buried pipe 3 at the front part of the cylindrical excavator main body 9. A vibrating excavator 7 is installed via a vibration isolating device 8, a buried pipe 3 having an outer diameter equal to the outer diameter of the excavator body 9 is connected to the rear of the excavator body 9, and the excavator is launched at the rear of the buried pipe 3. A hydraulic cylinder 4 as a pipe propulsion means installed in the shaft 12 is brought into contact. A vibration motor 13 is built into the vibration excavation tool 7, and a viscosity imparting liquid inlet 11 is provided at the tip of the vibration excavation tool 7, and one end of the motor cable 5 is connected to the vibration motor 13. One end of the application fluid injection hose 6 was connected to the vibrating excavator 7 in close proximity to the viscosity application fluid injection port 11, and the other ends of the motor cable 5 and the viscosity application fluid injection hose 6 were installed in the starting shaft 12 or on the ground. Connect to power source and viscosity imparting liquid supply (not shown).

Therefore, in this embodiment, a convex portion 10 is provided on the outer peripheral side surface of the excavator main body 9 so as to protrude in the radial direction of the excavator main body 9, the same as the outer diameter of the vibrating excavator 7. This convex portion 10 is located at the top, bottom, left and right of the excavator main body 9.
That is, they are protruded in the crosswise direction at equal intervals and have the same width, and extend in the axial direction of the excavator main body 9 from the vibration isolator 8 to approximately the middle of the excavator main body 9. Further, a recess 14 is provided at the outer peripheral edge of the vibrating excavator 7.

The pipe embedding device of the present invention in this embodiment has the above-mentioned configuration, and its operation will be explained below.

First, the vibration motor 13 is activated to vibrate the vibrating excavator 7, and the viscosity imparting liquid injection hose 6
The viscosity imparting liquid sent by the viscosity imparting liquid inlet 1
Injected into the excavation surface from 1. Then, the vibration of the vibrating excavator 7 causes the ground 1 around the vibrating excavator 7 to
A viscosity imparting liquid is injected into the ground 1 whose strength has decreased, and the viscosity imparting liquid and earth and sand are mixed and stirred to form a slurry, and this slurry 2
(Soil mixed with viscosity imparting liquid) passes through the recess 14 of the vibrating excavator 7 and the recess 15 between the protrusions 10 of the excavator main body 9, and then passes through the excavator main body 9, the buried pipe 3, and the ground 1. and is discharged into the starting shaft 12 through an annular gap formed between the two.

At this time, the diameter of the excavated hole 16 excavated by the vibrating excavator 7 is equal to the outer diameter of the vibratory excavator 7 and larger than the outer diameters of the excavator main body 9 and the buried pipe 3. As a result, an annular gap is formed between the excavator main body 9, the buried pipe 3, and the ground 1, and this annular gap is filled with the slurry 2. Therefore, in the present invention, the convex portion 10 is formed approximately in the middle of the vibration isolating device 8 and the excavator main body 9 (fixed side portion that does not vibrate), and extends in the radial direction of the excavator main body 9 to the outer diameter of the vibrating excavator 7. Since the protrusions are of the same size, this protrusion 10 comes into contact with the excavation hole 16, and the protrusion 10
This improves straight-line performance using the excavated hole 16 as a guide. In other words, the excavator body 9 is prevented from tilting upward due to buoyancy or downward due to its own weight, and furthermore, even if the soil quality of the ground is uneven, the excavator body 9 is directed toward the side with weaker resistance. There is no possibility that the main body 9 will be bent.

Next, the hydraulic cylinder 4 is extended to remove the buried pipe 3.
When the hydraulic cylinder 4 reaches the stroke end, the hydraulic cylinder 4 is retracted to newly connect the buried pipe 3, and the above-mentioned operation can be repeated to bury the buried pipe 3 in the ground 1. .

FIG. 4 is a sectional view showing another embodiment of the pipe burying device of the present invention.

In this embodiment, a protrusion 10' is protruded from the upper part of the excavator main body 9, and a protrusion 10'', which is wider than the protrusion 10', is protruded from the lower part.In this way, The shape, size, and number of the convex portions 10, 10', and 10'' are not particularly limited. However, the excavator body 9
Any material may be used as long as it can be fixed so as not to shift in the radial direction of the excavator main body 9, and slurry can be discharged rearward from the recess between the protrusions.

In addition, in the above-mentioned embodiment, the size of the convex portion 10 was made equal to the outer diameter of the vibrating excavator 7, but it may be slightly larger than the outer diameter of the vibrating excavator 7. In this case, the contact of the convex portion with the excavation hole 16 becomes stronger, so it is necessary to increase the propulsive force to some extent;
This has the effect of further improving straight running performance.

Further, in the above-described embodiments, a vibration excavation type pipe burying device has been described, but a rotary excavation type pipe burying device can also have the same effect. In the case of this rotary excavation method, a rotary excavator is installed at the front of the excavator body, and the outer diameter is larger than the outer diameter of the excavator body and the buried pipe. The outer diameter of the rotary excavator is equal to or slightly larger than the outer diameter of the rotary excavator.

As is clear from the above embodiments, the pipe burying device of the present invention is provided with a convex portion on the excavator main body, which is provided with an excavator whose outer diameter is larger than the outer diameter of the excavator main body and the buried pipe. The protrusion is the same as or slightly larger than the outside diameter of the excavator and is protruded in the radial direction of the excavator body, so the protrusion comes into contact with the excavation hole, and the protrusion uses the excavation hole as a guide, which improves straightness. is improved. Further, since the slurry is discharged backward by the concave portion between the convex portions, there is no problem with discharging excavated earth and sand. Furthermore, since the convex portion contacts the excavation hole, it is possible to achieve the effect of preventing the surface of the ground from falling off.

[Brief explanation of drawings]

1 to 3 show an embodiment of the pipe burying device of the present invention, FIG. 1 is a schematic diagram of the entire pipe burying device of the present invention, FIG. 3
The figure is a sectional view taken along the - line in FIG. 2. Fourth
The figure is a sectional view showing another embodiment of the pipe embedding device of the present invention. 1... Earth, 2... Slurry (viscosity imparting liquid mixed earth and sand),
3... Buried pipe, 4... Hydraulic cylinder, 7... Vibrating excavator, 9... Excavation machine main body, 10, 10', 10''... Convex portion, 12... Starting shaft, 15... Convex portion, 16... Excavation hole.

Claims (1)

[Claims] 1 Equip the front part of the excavation machine body with an excavator whose outer diameter is larger than the outer diameter of the excavation machine body and the buried pipe, connect the front part of the buried pipe to the rear part of the excavation machine body, and attach the excavator to the rear part of the buried pipe. The pipe propulsion means installed in the starting shaft is brought into contact with the excavation tool to excavate the ground, and the pipe propulsion means is operated to move the excavated earth and sand between the excavation machine body, the buried pipe, and the excavation hole. In a pipe burying device for discharging the pipe into the starting shaft through the formed annular gap and burying the buried pipe in the ground, a convex portion is provided on the outer peripheral surface of the excavator main body to a diameter equal to or slightly larger than the outer diameter of the excavator. It is characterized by a large protrusion extending toward the rear of the excavator body, with the convex portion serving as a guide for the excavation hole, and the concave portion between the convex portions serving as a discharge path for the excavated earth and sand to the rear. Pipe burying equipment.