JPH04108997A - Leading pipe direction correcting device for small-bore pipe pusher - Google Patents

Abstract

PURPOSE:To prevent a direction correcting function from being influenced by a soil condition by pivotally fitting a top edge head to a yoke formed at the front edge of a direction correcting cylinder, and forming a slope between the top edge head and yoke. CONSTITUTION:A direction correcting cylinder 6 is contracted in a leading pipe 1 to make the rear edge of a top edge head 2 come into contact with a front edge of the leading pipe 1. In this condition, the leading pipe 1 is driven into the ground with a small-bore pipe. When the leading pipe 1 is shifted from a planning line and a direction need to be corrected, the direction correcting cylinder 6 is made to go forward, and then the small-bore pipe is made start to drive forward again. At this time, the top edge head 2 which has received earth pressure rotates around a pin 4, and its neck is oscillated in a driving direction until the yoke 5 has come into contact with a slope 2f formed at the projecting part 2d of a bracket 2c. A driving direction of the leading pipe 1 is corrected in the direction in which the top edge head 2 has been oscillated. Then the direction correcting cylinder 6 is contracted in the leading pipe 1, and the small-bore pipe is driven forward again. It is thus possible to correct any direction by the single direction correcting cylinder 6.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) This invention relates to a leading pipe direction correction device for a small diameter pipe propulsion machine for burying a small diameter pipe underground.

(Prior art) Conventionally, in a small diameter pipe propulsion machine that propels a small diameter pipe underground and buries it underground, a leading pipe is attached to the tip of the small diameter pipe to be buried, and the direction of the leading pipe is controlled. Small-diameter pipes are buried with high accuracy along the planned line while being controlled.

In addition, the guide pipe used is one that matches the diameter of the small-diameter pipe to be buried, but as the diameter of the small-diameter pipe becomes smaller, there is less space for a direction correction device that can be installed inside the guide pipe. As shown, attach cylinder b to the tip of leading tube a.
Generally, a method is adopted in which the direction of the leading pipe a is corrected by providing a taber head C that can be taken in and out freely and selecting the direction of the inclined surface d of the taber head C.

(Problem to be Solved by the Invention) However, in the above-mentioned conventional method in which the direction of the leading pipe a is corrected by selecting the direction of the slope of the taber head C, the direction correction ability varies depending on the soil type, and especially in sandy soil. There were drawbacks such as the inability to obtain sufficient direction correction ability in soil, soft ground, and temperature-measuring strata.

Also, a swinging mechanism is installed at the tip of the lead tube.

Some devices use this oscillation mechanism to correct the direction by bending the tip of the leading tube, but each oscillation mechanism requires four or more cylinders, making the oscillation mechanism large and small in diameter. It has drawbacks such as not being applicable to lead pipes that bury small-diameter pipes.

This invention was made for the purpose of eliminating the above-mentioned conventional drawbacks, and the direction correction function is not affected by the soil quality, and the leading pipe direction of the small diameter pipe propulsion machine can be easily installed even in small diameter leading pipes. It is intended to provide a correction device.

(Means and Effects for Solving the Problems) In order to achieve the above object, the present invention provides a small-diameter pipe for burying the small-diameter pipe by propelling the small-diameter pipe equipped with the lead pipe into the ground. In the tube propulsion device, a direction correction cylinder that moves forward and backward while rotating is provided in the guide tube, and the tip head is pivotally connected to the yoke provided at the front end of the direction correction cylinder via a pin, and the tip head and the yoke are connected together. In between, an inclined surface is formed to accommodate the swing of the tip end by 9'1 around the pin.

This allows the tip head to swing in only one direction due to the slope, so by rotating the direction correction cylinder and selecting the direction of the slope, it is possible to correct the direction of the leading tube with a single direction correction cylinder. Become.

(Embodiment) An embodiment of the present invention will be described in detail with reference to the drawings shown in FIGS. 1 to 6.

In the figure, 1 is a small diameter pipe that should be buried underground (not shown)
This is a leading pipe that is attached to the tip of a pipe and propelled underground, and has a tip head 2 with the same outer diameter as the leading pipe 1 at the front.

The tip head 2 consists of a cylindrical main body 2b whose front surface is closed by an end plate 2a, and a bracket 2c provided inside the main body 2b. It is fixed to the rear surface of the end plate 2a by means of a tool 3.

The bracket 2c has a plate-shaped protrusion 2d that protrudes rearward.
A pin hole 2e is bored in the lower part of the protruding part 2d, and an inclined surface 2f inclined at an angle α with respect to the perpendicular is formed on the rear surface of the upper part of the protruding part 2d.

Note that the angle α is set to about 5°.

On the other hand, in the protrusion 2d of the Brakent 2C.

The tip of the recoke 5 is pivotally attached to the pin 4 inserted into the pin hole 2e, and the rear end of the yoke 5 is connected to the cylinder 6 by the guide rod 6a of the direction correction cylinder 6 provided in the leading pipe. It is attached to the tip.

The direction adjustment cylinder 6 is housed in the guide pipe 1 so as to be able to rotate and move back and forth, and is screwed into a threaded cylinder 7 having a multi-threaded screw 7a provided in the cylinder 6. When the correction cylinder 6 is moved back and forth, its tip moves forward and backward from the tip of the leading pipe 1 while rotating under the action of the screw cylinder 7, and the rotation angle of the direction correction cylinder 6 is detected by a potentiometer (not shown) and installed in the starting shaft. The information is displayed on the display section of the operation panel (both not shown).

Note that 9 in the figure is a seal interposed between the main body 2b of the tip head 2 and the yoke 5, and is designed to prevent dirt, etc. from entering the tip head 2 even if the tip head 2 is bent. .

Next, to explain the operation, when burying a small diameter pipe by moving the leading pipe 1 straight, the direction correction cylinder 6 is contracted into the leading pipe 1 as shown in Figs. nd 2
The rear end of the guide tube 1 is brought into contact with the front end of the guide tube 1.

In this state, the leading pipe 1 is propelled underground together with the small diameter pipe, and even if earth pressure acts on the tip hend 2 during propulsion, this earth pressure is transmitted to the leading pipe 1 through the tip hend 2. , Tonosho prevents the tip head 2 from shaking its head.

Next, when the leading pipe 1 deviates from the planned line and the direction needs to be corrected, first the direction correction cylinder 6 is advanced.

Then, when the rotation angle displayed on the display section of the operation panel reaches a desired value, the direction correction cylinder 6 is stopped, and in this state, propulsion of the small diameter pipe is started again.

As a result, the tip head 2 that has received the tonosho rotates around the bottle 4, and heads in the propulsion direction as shown in FIG. is shaken.

Therefore, by further propelling the small diameter tube in this state, the direction of propulsion of the leading tube 1 is corrected in the direction in which the tip head 2 is swung.

When the direction of the leading pipe 1 is corrected to the planned line, the direction correction cylinder 6 is retracted into the leading pipe 1 to propel the small diameter pipe again in the state shown in Figs. 1 and 2. The correction cylinder 6 allows direction correction in all directions.

(Effects of the Invention) As detailed above, this invention allows the direction of the leading pipe to be corrected using a single direction correcting cylinder, so it can be easily installed inside the leading pipe where a smaller diameter pipe is buried. In addition, since a taber head is not used, it is possible to eliminate problems such as variations in the direction correction function depending on the soil quality, or problems such as the direction correction function being deteriorated and direction correction becoming impossible.

Furthermore, since only one hydraulic cylinder is required compared to conventional swinging mechanisms, the hydraulic equipment and hydraulic piping for controlling this can be simplified, so it can be provided at low cost.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a leading pipe according to an embodiment of the present invention.
Fig. 2 is a longitudinal sectional view of the same, Fig. 3 is a sectional view taken along the line The action explanatory diagram, FIG. 7, is a conventional explanatory diagram. ■... Leading tube 2... Tip head 2f...
Inclined surface 4...bin

Claims (1)

[Claims] In a small-diameter pipe propulsion machine that propels a small-diameter pipe with a guide pipe 1 attached thereto and buries the small-diameter pipe underground, a direction correction cylinder 6 moves forward and backward while rotating inside the guide pipe 1.
The tip head 2 is pivotally connected to the yoke 5 provided at the front end of the direction correction cylinder 6 via a pin 4, and the neck of the tip head 2 is connected between the tip head 2 and the yoke 5 with the pin 4 as the center. A leading pipe direction correction device for a small-diameter pipe propulsion machine formed with an inclined surface 2f that allows swinging.