JP2611112B2 - Propulsion pipe cutting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for cutting a buried pipe for propulsion when sewage pipes, water pipes, sheath pipes of gas and electric conduits are buried underground, and more particularly, to a plurality of rows of rectangular pipes. The present invention relates to a cutting device for a rigid 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 rigid vinyl chloride pipe for propulsion used for a sewer or a water supply pipe, a cylindrical body having a plate-like cross section is often used, and is excellent in hydraulicity, watertightness, corrosion resistance and the like. Therefore, it has been widely adopted in recent years, especially in the field of sewerage. Both end surfaces of the buried pipe are cut at a right angle to the axial direction, and the connection of the buried pipe is performed by inserting an end face of the buried pipe into a collar and connecting the end faces with each other.

[0003] In addition, a method of connecting a buried pipe by providing a receiving port and an outlet at the pipe end has been used. However, as a pipe material used in the propulsion method, a propulsion force is transmitted through a wall surface of the buried pipe. The butt connection method described above is often used.

[0004]

According to the prior art described above, hard vinyl chloride pipes are buried under propulsion. However, when the buried pipe has a plate-like cylindrical section and is laid deep in the ground. At present, it is difficult to withstand the earth pressure, and may have a flat cross section or sometimes break, and is currently used only for a relatively shallow propulsion method.

[0005] For this reason, research and development of a pipe material having a strong resistance to earth pressure after propulsion burial has been carried out, and a spiral steel pipe has been fusion-bonded with a required number of rigid vinyl chloride sheets having a hollow rectangular cross section. PVC pipes have been developed that are resistant to severe earth pressure. The end face of the 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 a method of connecting the end faces to each other to make a collar connection. In addition, a reinforced plastic tube has been developed in which glass fiber resin is attached to both sides of a resin mortar to enable light weight and high strength. An end face of the buried pipe is also cut at a right angle in the axial direction of the buried pipe, and a step connection is provided at an outer edge to connect the collar with a collar.

However, in the case of the butting method of cutting at right angles in the axial direction, as shown in FIG. 5, the outer shell portion of the end face of the embedded pipe is provided with a cutout for fitting a collar, so that the embedded pipe is not provided. The outer shell at the end is thinned or missing, and most of the transmission of propulsion is transmitted only to the inner shell,
This leads to damage to the inner shell. Also, the butt connection has a small bonding area at the buried pipe connection part, and the connection part is detached due to the partial pressure during the propulsion construction, making the propulsion construction difficult.

[0007] As a method of connecting a buried pipe to solve the above-mentioned problem, a connection collar manufactured by cutting out a predetermined length while leaving only the inner shell of the buried pipe end face and fitting the shape of the notch portion to the buried pipe connection section. A connection method has been proposed in which bonding is performed to increase the bonding area of the connection portion of the buried pipe, and to reliably transmit the transmission of the propulsion force from the outer shell and the inner shell. Is very troublesome, and has not been adopted as a method of connecting buried pipes for propulsion.

The present invention has been made in view of the above-mentioned problems in the prior art, and ensures that the propulsive force can be transmitted to the outer shell and the inner shell even during the propulsion work, and that both ends of the protruding buried pipe are not cut off at the bonding surface. An apparatus is provided.

[0009]

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

[0010] The shape of the cutting blade disposed at the center may be a saw blade-like shape or a shape provided with a tip at the outer edge, and is configured to have a size capable of reliably cutting the wall surface of the buried pipe for propulsion. As the cutting blade arranged on both sides of the cutting blade, a plurality of saw blades may be provided adjacent to each other, or a cutting blade having a chip embedded in a cylindrical outer peripheral portion may be used. The size of the cutting blade is smaller than the cutting blade so as not to cut at least the inner shell of the buried pipe wall cross section, depending on the shape of the buried pipe wall cross section.

[0010] By providing a guide ring on both sides of the cutting blade, the length of which is smaller than the cutting blade by the thickness of the inner shell of the buried pipe wall, cutting of the inner shell by the cutting blade can be prevented. it can.

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

If the cutting blade, the cutting blade and the guide ring are configured to be detachable, 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 center cutting blade first comes into contact with the buried pipe outer shell and starts cutting the wall surface. Then, as the cutting blade advances, the cutting blades on both sides start cutting the buried pipe wall surface. At this time, the size of the cutting blade is smaller than that of the cutting blade so that the inner shell thickness of the buried pipe remains. When the cutting and cutting of the buried pipe are completed, the guide rings on both sides of the cutting blade abut against the outer shell of the buried pipe to prevent the cutting blade from cutting the inner shell.

By the rotation of the cutting blade and the cutting blade as described above, the cutting and cutting of the buried pipe can be simultaneously performed with high accuracy, and the work of cutting the buried pipe can be efficiently performed.

[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 an apparatus 1 for cutting a buried pipe for propulsion according to an embodiment of the present invention. A disk-shaped cutting blade 2 having a saw blade is rotatably disposed at the center, and a plurality of saw blades formed at least smaller than the outer diameter of the cutting blade 2 are adjacent to 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 and have a mechanism that rotates in conjunction with each other. On both sides of the cutting blade 3, there are provided guide rings 4 which are made smaller by a length obtained by subtracting only the thickness of the inner shell 10 of the wall surface of the buried pipe for propulsion from the cutting blade 3. The guide ring 4 is fixed to a rotation 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 device 8 is provided at a tip of the rotating shaft 6. This is a buried pipe cutting device 1 configured as described above.

In the above embodiment, the shape of the cutting blade 2 and the cutting blade 3 is exemplified by a saw blade shape, 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 cutting and cutting conditions of a buried pipe using the cutting apparatus 1 of the present invention. A propulsion buried pipe 9 having a wall surface having a rectangular cross section is formed continuously. In the center of the cutting device 1, a cutting blade 2 is disposed so as to protrude from the guide ring 4 by a thickness equal to or greater than the wall thickness of the buried pipe 9.
On both sides of the cutting blade 2, a guide ring 4
The cutting blade 3 is arranged so as to protrude by the thickness of the inner shell 10. When the driving device 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. By continuing rotation, the cutting blade 2 cuts the inner shell 10 of the buried pipe 9, and the cutting blade 3 cuts both end faces of the buried pipe 9 into the inner shell 10.
Cutting leaving only. As the cutting and cutting method over the entire circumference, a method of cutting and cutting by rotating the buried pipe 9 at a predetermined speed while fixing the cutting apparatus 1 may be used, or the buried pipe 9 may be fixed and 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 buried propulsion pipe 9 which is a vinyl chloride pipe produced by fusing a rigid vinyl chloride sheet having a hollow rectangular cross section cut and cut by the cutting apparatus 1 of the present invention into a spiral steel pipe type. It is a longitudinal section showing a situation. A connection collar 12 conforming to the shape of the cutout portion formed by cutting is inserted into the rear end face of the buried pipe 9 after the propulsion is completed,
The distal end surface of the subsequent buried pipe 9 is attached to the connection collar 12. An adhesive 13 is applied between the buried pipe 9 and the connection collar 12 to improve the rigidity and waterproofness of the connection portion of the buried pipe 9 and to ensure that the propulsive force is applied from the outer shell 11 and the inner shell 10 of the buried pipe 9. Let them communicate.

FIG. 4 is a longitudinal sectional view showing a connection state of a reinforced plastic pipe 14 as another pipe material. The connection method is the same as that for the rigid PVC pipe 9 and the two buried pipes 1
By the connecting collar 12 attached to the joint of No. 4, the propulsive force is reliably transmitted from the outer shell 17 and the inner shell 15.

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

[0021]

According to the propulsion pipe cutting device of the present invention, the cutting and cutting of the buried propulsion pipe can be easily and accurately manufactured, and the cutting and cutting time can be shortened, and the production cost of the buried pipe can be significantly reduced. In addition, it is possible to reliably transmit the propulsion force during construction and to obtain a rigid structure in which the bonding of the buried pipe connection is also integrated.

[0022]

[Brief description of the drawings]

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

FIG. 2 is a longitudinal sectional view illustrating cutting and cutting conditions of the propulsion pipe cutting device of the present invention.

FIG. 3 is a longitudinal 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 longitudinal 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 longitudinal sectional view for explaining a problem of a buried pipe cutting method in the prior art.

[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 9 Hard PVC buried pipe 10 Hard PVC buried pipe inner shell 11 Hard PVC buried pipe outer shell 12 Connection collar DESCRIPTION OF SYMBOLS 13 Adhesive 14 Reinforced plastic buried pipe 15 Reinforced plastic buried pipe inner shell 16 Resin mortar 17 Reinforced plastic buried pipe outer shell 18 Collar according to prior art 19 Connection detachment point

Claims (1)

(57) [Claims] 1. A cutting device for a continuously molded propulsion pipe, wherein a rotatable disk-shaped cutting blade is disposed at the center, and a cutting formed at both sides of the cutting blade at least smaller than the outer diameter of the cutting blade. A propulsion pipe cutting device, wherein a blade is rotatably arranged.