JPH06229190A - Pipe cutter for propulsion - Google Patents

Abstract

PURPOSE:To cut and machine a buried pipe for propulsion accurately in a short time by arranging machining edges having a diameter smaller than a discoid cutting edge on both sides of the cutting edge disposed at a center. CONSTITUTION:A discoid cutting edge 2 arranged at the center of a cutter 1 and machining edges 3, 3 disposed on both sides of the cutting edge 2 are rotated by operating a driver 8. The size of the machining edge 3 is formed in size smaller than the outside diameter of the cutting edge 2 so that the thickness section of the interior shell of a buried pipe is left. Consequently, the cutting edge 2 having a large diameter at the center is brought into contact with the exterior shell of the buried pipe first and starts the cutting of a wall surface, and the machining edges 3 on both sides begin to machine the wall surface of the buried pipe as cutting progresses. When the cutting and machining of the buried pipe are completed, guide rings 4 on both sides of the machining edges 3 are abutted against the exterior shell of the buried pipe, thus preventing the machining of the interior shell by the machining edges 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for cutting a propulsion buried pipe when a sewer pipe, a water supply pipe, a sheath pipe for gas or a conduit pipe is buried in the ground. The present invention relates to a cutting device for a hard vinyl chloride pipe or a reinforced plastic pipe formed by spirally fusing a vinyl chloride material having a cross section.

[0002]

2. Description of the Related Art Conventionally, as a shape of a hard vinyl chloride pipe for propulsion used for a sewer or a water supply pipe, a tubular body having a plate-shaped cross section is often used, which is excellent in hydraulic property, watertightness, corrosion resistance and the like. Therefore, it has been widely adopted in recent years especially in the field of sewerage. Both end faces of the buried pipe are cut at right angles to the axial direction, and the buried pipe is connected by inserting the end face of the buried pipe into the collar and butt-connecting the end faces.

In addition, a method of joining a buried pipe by providing a receiving port and a spout at the end of the pipe is also used, but as a pipe material used in the propulsion method, a propulsive force is transmitted through a wall surface of the buried pipe. The butt connection method described above is often used.

[0004]

When the hard vinyl chloride pipe is propulsively buried by the above-mentioned conventional technique, the buried pipe has a plate-shaped cross section and is installed at a deep position in the ground. It is not possible to resist the earth pressure, has a flat cross section, and is sometimes damaged, so it was used only for the propulsion method at a relatively shallow position.

For this reason, research and development of a pipe material having a strong resistance to earth pressure after propulsion and burying has been conducted, and a spiral vinyl pipe fusion-manufactured with a required number of rigid vinyl chloride sheets having a hollow rectangular cross section. A vinyl chloride tube that is resistant to earth pressure has been developed. The end face of this buried pipe is cut at a right angle to the axial direction of the buried pipe, and the connection of the buried pipe is performed by abutting the end faces and making a collar connection. In addition, glass fiber resin is attached to both sides of the resin mortar to develop a reinforced plastic tube that is lightweight and has high strength. The end face of this buried pipe is also cut at a right angle to the axial direction of the buried pipe, and a butt joint method is used in which a step is provided at the outer edge portion to perform color connection.

However, in the case of the abutting method of cutting at right angles to the axial direction described above, as shown in FIG. 5, the outer shell portion of the end face of the embedded pipe is provided with a notch for fitting the collar, so that the embedded pipe is The outer shell of the end becomes thin or disappears, and most of the transmission of propulsive force is transmitted only by the inner shell,
It causes damage to the inner shell. In addition, since the butt connection is used, the bonding area of the buried pipe connection portion is small, and the connection portion is separated due to the unbalanced pressure during the propulsion construction, which makes the propulsion construction difficult.

As a method of connecting a buried pipe to solve the above problems, a notch is cut out by a predetermined length leaving only the inner shell of the end face of the buried pipe, and a connection collar manufactured according to the shape of the notch is attached to the buried pipe connecting portion. A connection method has been proposed in which the connection area is increased by increasing the bonding area of the buried pipe connection part by joining and reliably transmitting the transmission of the propulsion force from the outer shell and the inner shell. At present, it is not adopted as a method for connecting the buried pipe for propulsion because the work of installing the pipe is extremely troublesome.

In view of the above problems of the prior art, the present invention is capable of reliably transmitting the propulsive force to the outer shell and the inner shell even during the propulsion construction, and further cutting the both ends of the propulsion embedded pipe which does not separate at the adhesive surface. A device is provided.

[0009]

That is, according to the structure of the present invention, a rotatable disc-shaped cutting blade is arranged in the center, and a cutting blade formed to be smaller than at least the outer diameter of the cutting blade is rotatable on both sides of the cutting blade. It is the embedded buried pipe cutting device for propulsion.

The cutting blade arranged in the center may be in the shape of a saw blade or a tip provided on the outer edge, and the cutting blade has a size capable of reliably cutting the wall surface of the propulsion buried pipe. As the cutting blades arranged on both sides of the cutting blade, a plurality of saw blades may be provided adjacent to each other, or a chip may be embedded in a cylindrical outer peripheral portion. The size of the cutting blade is smaller than that of the cutting blade so that at least the inner shell of the buried pipe wall cross section is not cut depending on the shape of the buried pipe wall cross section.

By providing guide rings on both sides of the cutting blade which are smaller than the cutting blade by a length obtained by subtracting the thickness of the inner shell of the buried pipe from the cutting blade, it is possible to prevent the cutting blade from cutting the inner shell. it can.

As a method for cutting the propulsion embedded pipe, a method of fixing the cutting device and rotating the embedded pipe may be used.
A method in which the embedded pipe is fixed and the cutting device is rotated along the outer periphery of the embedded pipe may be used.

If the cutting blade, the cutting blade and the guide ring have a removable structure, they can be replaced even if the type of the buried pipe is changed, and the buried pipe can be cut efficiently.

[0013]

According to the invention described above, the cutting blade and the cutting blade are rotated by the operation of the driving machine, and the central cutting blade first comes into contact with the outer shell of the buried pipe to start cutting the wall surface. Then, as the cutting blade advances, the cutting blades on both sides start cutting the wall surface of the buried pipe. At this time, the size of the cutting blade is smaller than that of the cutting blade so that the thickness of the inner shell of the buried pipe remains. When the cutting and cutting of the embedded pipe are completed, the guide rings on both sides of the cutting blade abut the outer shell of the embedded pipe to prevent the cutting blade from cutting the inner shell.

By rotating the cutting blade and the cutting blade as described above, cutting and cutting of the embedded pipe can be performed simultaneously with high precision, and the cutting work of the embedded pipe can be performed efficiently.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described below with reference to the drawings. FIG. 1 is a side view showing a cutting device 1 for a propulsion buried pipe according to an embodiment of the present invention. A disk-shaped cutting blade 2 having a saw blade is rotatably arranged in the center, and a plurality of saw blades formed to be smaller than at least the outer diameter of the cutting blade 2 are adjacently provided on both sides of the cutting blade 2. The provided cutting blade 3 is arranged. The cutting blade 2 and the cutting blade 3 are connected to each other so as to rotate together. On both sides of the cutting blade 3, there are provided guide rings 4 which are smaller than the cutting blade 3 by a length obtained by subtracting only the thickness of the inner shell 10 of the wall surface of the propulsion buried pipe. The guide ring 4 is fixed to a rotating shaft 6 at the center inside the ring 4 by a support rod. A first gear 5 for receiving a rotational force from a second gear 7 provided on the driving machine 8 is provided at the tip of the rotary shaft 6. It is the buried pipe cutting device 1 configured as described above.

In the above embodiment, the cutting blade 2 and the cutting blade 3 are illustrated as saw blade shapes, but it is also possible to adopt a structure in which a cutting tip or the like is embedded in the outer peripheral portion.

FIG. 2 is a longitudinal sectional view showing the cutting and cutting conditions of the buried pipe using the cutting device 1 of the present invention. A buried buried pipe 9 whose wall surface has a rectangular cross section is continuously formed. At the center of the cutting device 1, a cutting blade 2 is arranged so as to protrude from the guide ring 4 by the wall thickness of the buried pipe 9 or more.
The guide ring 4 and the buried pipe 9 are provided on both sides of the cutting blade 2.
The cutting blade 3 is arranged so as to protrude by the thickness of the inner shell 10. When the driving machine 8 is operated, the guide ring 4, the cutting blade 3 and the cutting blade 2 rotate, and the cutting blade 2 starts to cut the outer shell 11 of the buried pipe 9. As the cutting blade 2 advances, the cutting blades 3 on both sides also start cutting the outer shell 11 of the buried pipe 9. Then, by continuing the rotation, the cutting blade 2 cuts the inner shell 10 of the embedded pipe 9, and the cutting blade 3 connects both end surfaces of the embedded pipe 9 to the inner shell 10.
Only leave and cut. As the cutting and cutting method over the entire circumference, a method of fixing the cutting device 1 and rotating the embedded pipe 9 at a predetermined speed to cut and cut may be used, or the embedded pipe 9 may be fixed. Alternatively, a method of rotating the cutting device 1 along the outer circumference of the buried pipe 9 may be used.

FIG. 3 shows a connection of a propulsion buried pipe 9 which is a vinyl chloride pipe produced by fusing a hard vinyl chloride sheet having a hollow rectangular cross section cut and cut by the cutting device 1 of the present invention to a spiral steel pipe type. It is a longitudinal cross-sectional view showing a situation. On the rear end surface of the buried pipe 9 that has been propelled, a connection collar 12 matching the shape of the cutout portion formed by cutting is inserted and attached.
The tip end surface of the subsequent buried pipe 9 is attached to the connection collar 12. An adhesive 13 is applied between the embedded pipe 9 and the connection collar 12 to improve the rigidity and water stopping property of the connection portion of the embedded pipe 9 and to secure the propulsive force from the outer shell 11 and the inner shell 10 of the buried pipe 9. Make it communicate.

FIG. 4 is a longitudinal sectional view showing a connection state of the reinforced plastic pipe 14 which is another pipe material. The connection method is the same as that of the hard vinyl chloride pipe 9, and both buried pipes 1
The connecting collar 12 mounted on the joint portion of No. 4 ensures that the propulsive force is transmitted from the outer shell 17 and the inner shell 15.

If the cutting blade 2 and the cutting blade 3 have a removable structure, they can be replaced even if the diameter or type of the buried pipe changes, and can be used for a wide range of cutting and cutting.

[0021]

With the propulsion pipe cutting device of the present invention, the propulsion embedded pipe can be easily cut and cut with high precision, the cutting and cutting time can be shortened, and the embedded pipe manufacturing cost can be remarkably reduced. In addition, it has become possible to reliably transmit the propulsive force even during construction and to have a rigid structure in which the connection of the buried pipe connection is integrated.

[0022]

[Brief description of drawings]

FIG. 1 is a side view illustrating a propulsion pipe cutting device of the present invention.

FIG. 2 is a vertical sectional view for explaining cutting and cutting conditions of the propulsion pipe cutting device of the present invention.

FIG. 3 is a vertical cross-sectional view illustrating a connection state of a hard vinyl chloride pipe cut and cut by the cutting device of the present invention.

FIG. 4 is a vertical cross-sectional view illustrating a connection state of a reinforced plastic pipe cut and cut by the cutting device of the present invention.

FIG. 5 is a vertical cross-sectional view for explaining a problem of the buried pipe cutting method in the conventional technique.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cutting device 2 Cutting blade 3 Cutting blade 4 Guide ring 5 1st gear 6 Rotating shaft 7 2nd gear 8 Drive machine 9 Hard vinyl chloride buried pipe 10 Hard vinyl chloride buried pipe inner shell 11 Hard vinyl chloride buried pipe outer shell 12 Connection collar 13 Adhesives 14 Reinforced Plastic Buried Pipes 15 Reinforced Plastic Buried Pipe Inner Shells 16 Resin Mortar 17 Reinforced Plastic Buried Pipe Outer Shells 18 Collar 19 by Conventional Technology 19 Connection Part Detachment

Claims (1)

[Claims] 1. A cutting device for a continuously molded propulsion pipe, in which a rotatable disc-shaped cutting blade is arranged at the center, and cutting is formed on both sides of the cutting blade at least smaller than the outer diameter of the cutting blade. A propulsion pipe cutting device having a blade rotatably arranged.