JPS62160400A - Pipe burying device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a pipe burying device, and particularly to a pipe burying device suitable for burying small diameter pipes.

[Background of the invention]

A device for burying a small-diameter pipe, for example, a pipe with a diameter of 800 fi or less, is described in Japanese Patent Application Laid-Open No. 57-29797. Next, this pipe embedding device will be explained with reference to FIG. In the figure, this pipe burying device is installed in the starting shaft 2.
A hydraulic cylinder 3 as a propulsion means and a rotary excavator drive and viscosity imparting liquid supply section 4 are installed inside. On the other hand, a rotary excavator 6 is rotatably supported at the front part of the excavator main body 5, and the rotary excavator 6 has excavation blades 7, 8, . A stirring blade 9.10 and an inlet 11 for the viscosity-imparting liquid are provided. A buried pipe 12 having an outer diameter smaller than the outer diameter of the rotary excavator 6 is installed at the rear of the excavator main body 5.
The front part of the buried pipe 12 is connected, and the rear part of the buried pipe 12 is brought into contact with the hydraulic cylinder 3. An excavating tool rotating shaft/viscosity imparting liquid supply pipe 13 is passed through the buried pipe 12, and both ends of the excavating tool rotating shaft/viscosity imparting liquid supply pipe 13 are connected to the rotary excavating tool 6 and a rotary excavating tool drive unit/viscosity imparting liquid supply pipe 13. and the supply section 4 respectively. A pressure holding frame 1 that holds earth and sand pressure in an annular gap 14 formed between the excavated hole on the side of the starting shaft 2 and the buried pipe 12.
5 is provided, and a soil discharge port 16 is provided in the pressure holding frame 15.

Next, the operation of the pipe embedding device constructed as described above will be explained. First, the rotary excavator drive unit and viscosity imparting liquid supply unit 4 is driven to rotate the rotary excavator 6, and while excavating the ground 1 with the excavator blade 7.8 of the rotary excavator 6, the rotary excavator Inject the viscosity imparting liquid from the injection port 11 of 6,
The injected viscosity-imparting liquid and the excavated earth and sand are stirred and mixed by stirring blades 9 and 10 of the rotary excavator 6 to produce viscous liquid mixed earth and sand 17. At this time, since the outer diameter of the rotary excavator 6 is larger than the outer diameter of the buried pipe 12, an annular gap 14 is formed between the excavated hole in the earth 1 and the buried pipe 12.

For this purpose, the viscous liquid mixed earth and sand 17 generated in the vicinity of the rotary excavator 6 is forced backward by the pressure of the viscosity imparting liquid injected from the injection port 11 and the propulsive force of the hydraulic cylinder 3. The soil is discharged from the discharge port 16 of the pressure holding frame 15 to the starting shaft 2 through the outer circumference of the main body 5 and the annular gap 14 . On the other hand, simultaneously with the above-mentioned excavation of the earth 1, the hydraulic cylinder 3 is extended to propel the buried pipe 12. When the hydraulic cylinder 3 reaches the stroke end, the hydraulic cylinder 3 is retracted and a new buried pipe 12 is connected in the starting shaft 2, and the buried pipes 12 are successively buried by repeating the above-mentioned operation. I can do it.

In this way, the above-mentioned pipe burying device excavates the ground 1 at the front part of the excavator main body 5 to form soil mixed with viscous liquid.
The insertion resistance is reduced, and since the annular gap 14 between the excavated hole and the buried pipe 4 is filled with viscous liquid mixed earth and sand, the frictional resistance between the ground 1 and the buried pipe 12 is reduced. be converted into Therefore, compared to conventional consolidation methods, it is possible to reduce the propulsion force applied to the buried pipe 12, and since the force acting on the buried pipe 12 is small, damage to the buried pipe 12 is extremely reduced, and the direction accuracy is This has the effect of improving

However, in the above-mentioned pipe burying device, since the rotary excavator 6 is rotated from the rotary excavator driving unit/viscosity imparting liquid supply unit 4 installed in the starting shaft 2 via the rotating shaft 13, As the propulsion distance (pipe buried length) becomes long, there are problems such as the rotary shaft 13 becoming twisted, and if the buried pipe 12 is buried in a meandering manner, it becomes difficult to connect the rotary shaft 13. .

As a countermeasure against this problem, a method can be considered in which a hydraulic motor or an electric motor (with a speed reducer) as a drive device for the rotary excavator 6 is installed inside the excavator main body 5, and the rotary excavator 6 is rotated by this. When this method is applied to a small diameter excavator, it is necessary to arrange the hydraulic motor or electric motor so that the drive shaft of the hydraulic motor or electric motor is concentric with the rotation center of the rotary excavator 6 due to space considerations. . However, in reality, there are few cases in which the drive shaft of a hydraulic motor or electric motor is the center, so the passage for supplying the viscosity imparting liquid to the injection port 11 provided at the center of the rotary excavator 6 is It has to be secured in a part other than the drive shaft, that is, in an outside part of the hydraulic motor or electric motor, which makes the structure extremely complicated, and there is a problem that it cannot be applied to an extremely small excavator with an outer diameter of about 200 mφ.

[Purpose of the invention]

The purpose of the present invention is to solve problems such as the rotary shaft getting stuck or being unable to connect by installing the drive device of the rotary excavation tool inside the excavator body, and to reduce the radial direction of the drive device so that it can be used in an extremely small diameter. It is an object of the present invention to provide a pipe embedding device which can be applied to various objects, has a supply passage for a viscosity imparting liquid in a drive device, and has a simple structure.

[Summary of the invention]

In order to achieve this object, the present invention has a rotary excavator mounted on the front part of the excavation machine main body, an injection port for injecting a viscosity imparting liquid into the excavated earth and sand, and a Connecting the front part of a buried pipe whose outer diameter is smaller than the outer diameter of the rotary excavation tool to the rear part, and bringing the rear part of the buried pipe into contact with a propulsion means installed in the starting shaft to rotate the rotary excavation tool. At the same time, the viscosity-imparting liquid is injected into the excavated soil from the injection port to form a viscous liquid mixed earth and sand, and the viscous liquid mixed earth and sand is transported backward through the outer periphery of the excavation machine body and propelled. In the pipe burying device, the driving device for the rotary excavation tool is composed of a hollow hydraulic jack and a screw shaft that is inserted through the hollow part of the hollow hydraulic jack and rotates by the expansion and contraction movement of the hydraulic jack. A hydraulic jack is installed inside the excavator main body so that its expansion and contraction is performed along the axial direction of the excavator main body, and the tip of the screw shaft is connected to a rotating excavator, and the hydraulic jack is installed inside the screw shaft. By providing the illumination path for supplying the viscosity imparting liquid to the injection port, the rotary excavating tool can be driven on the excavator main body side, and the drive device can be downsized in the radial direction, resulting in an extremely small diameter one. is also applicable.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. Fig. 1 is a longitudinal sectional view of a pipe burying device according to the present invention;
The figure shows its working diagram. In the figure, the same reference numerals as in FIG. 3 represent the same or equivalent items. This pipe burying device uses a hollow hydraulic jack 18 and a hollow hydraulic jack 1 as the driving device for the rotary excavating tool 6.
8 and a screw shaft 19 that rotates as the hydraulic jack 18 expands and contracts.

The jack main body 18a of the hollow hydraulic jack 18 is mounted on the inner wall of the excavator main body 5 so that its rod 18b can expand and contract along the axial direction of the excavator main body 5. A screw nut 20 is fixed to the tip of the rod 18b. The screw shaft 19 has a thread 19a cut from its middle portion to its rear end, and the threaded portion is screwed into the screw nut 20. The screw shaft 19 is arranged on the rotation center line of the rotary excavator 6, and the tip of the screw shaft 19 is connected to the back surface of the rotary excavator 6, and the rear end is attached to a bearing 2 provided on the excavator main body 5. Supported by the industry. Also, screw shaft 1
A passage 22 for supplying the viscosity imparting liquid to the injection port 11 is provided inside the container 9 . The passage 22 is connected at the rear end of the screw shaft 19 via a swivel joint 23 to a conduit 24 that leads the viscosity imparting liquid from a viscosity imparting liquid supply section (not shown) in the starting shaft. In addition, 18c and 18d are a contraction side boat and an extension side boat of the hollow hydraulic jack 18, 25 is a sealing material for sealing between the excavator main body 5 and the rotary excavator 6, and 26 is a seal material between the rotary excavator 6 and the hollow hydraulic jack 18. This is a sealing material that seals between the jack body 18a and the jack body 18a.

Next, the operation of this embodiment will be explained.

Hollow hydraulic jack 18 loft per day as shown in Figure 1
When b is at its maximum contraction, the hydraulic power source (not shown)
When more hydraulic pressure is supplied to the extension boat 18d, the rod 18b of the hydraulic jack 18 extends as shown in FIG. When the screw nut 20 moves due to the extension of the rod 18b, the screw shaft 19 that is screwed into the nut rotates. Rotational torque (kgf - cm) generated on the screw shaft 19 by the rod thrust of the hollow hydraulic jack 18
) is expressed by the following formula.

Fa -1 Here, Fa: Axial load (kgf) 1: Thread lead of screw shaft (C...) η: Screw efficiency The rotation of the screw shaft 19 directly becomes the rotation of the rotary excavator 6, and the hollow hydraulic jack 18 The rotary excavator 6 continues to rotate in the same direction until the extension of the rod 18b reaches the stroke end. Then, when the rod 18b is extended to the stroke end, a directional control valve (not shown) is switched to supply pressure oil to the contraction side boat 18 of the hollow hydraulic jack 18, and as the rod 18b contracts,
The screw shaft 19 rotates in the opposite direction to when it is extended, and the rotary excavator 6 also rotates in the opposite direction. In this way, the hollow hydraulic jack 18 is extended.

By repeating the reduction operation, the rotary excavator 6 excavates the ground 1 while rotating forward and backward.

In addition, in the above operation, the viscosity imparting liquid is applied to the screw shaft 1.
It is fed to the inlet 11 through a passage 22 in 9 .

Therefore, in this embodiment, since the driving device of the rotary excavator 6 is installed inside the excavator main body 5, the problems of the pipe burying device shown in FIG. Problems such as disability can be resolved.

In addition, since the drive device is composed of the hollow hydraulic jack 18 and the screw shaft 19, the outer diameter of the drive device itself can be reduced to the outer diameter of the hollow hydraulic jack 18, and the outer diameter of the excavator can be reduced to about 200 mφ. It can also be applied to extremely small diameter objects. Furthermore, the supply passage for the viscosity imparting liquid is connected to the screw shaft 1.
9, the structure is simple.

〔Effect of the invention〕

As explained above, according to the present invention, since the driving device of the rotary excavator is installed inside the excavator main body, it is possible to solve the conventional problems such as twisting of the rotary shaft and inability to connect.

Furthermore, since the drive device is composed of a hollow hydraulic jack and a screw shaft, the outer diameter of the drive device itself can be reduced to the outer diameter of the hollow hydraulic jack, and it can be applied to a device with an extremely small diameter. Furthermore, since the supply passage for the viscosity imparting liquid is provided within the screw shaft, the structure can be simplified.

[Brief explanation of drawings]

1 and 2 show an embodiment of the present invention, FIG. 1 is a longitudinal sectional view of a pipe burying device according to the present invention, FIG. 2 is a diagram of its operation, and FIG. 3 is a diagram of a conventional pipe burying device. FIG. 2... Starting shaft, 3... Hydraulic cylinder, 5... Excavation machine body, 6... Rotating excavator, 11... Inlet, 1
4... Buried pipe, 18... Hollow hydraulic jack, 18a
... Jack body, 18b... Rod, 19...
Screw shaft, 20...Screw nut, 22...
- Passage for supplying viscosity imparting liquid.

Claims (1)

[Claims] A rotary excavator is attached to the front part of the excavator body, and an injection port for injecting a viscosity imparting liquid into the excavated soil is provided on the rotary excavator, and the outer diameter is set to the outer diameter of the rotary excavator at the rear of the excavator body. Connect the front part of a buried pipe smaller than In a pipe burying device that injects a viscosity imparting liquid into excavated soil to form viscous liquid mixed earth and sand and propels the viscous liquid mixed earth and sand while transferring it backward through the outer periphery of an excavation machine main body, the rotary excavation tool drive device is composed of a hollow hydraulic jack and a screw shaft that is inserted through the hollow part of the hollow hydraulic jack and rotates due to the expansion and contraction movement of the hydraulic jack,
The hollow hydraulic jack is installed inside the excavator main body so that its expansion and contraction is performed along the axial direction of the excavator main body, and the tip of the screw shaft is connected to a rotary excavator, and the screw shaft A pipe embedding device characterized in that a passage for supplying a viscosity imparting liquid to the injection port is provided inside.