JP5474408B2 - Cutter head for propulsion of existing pipes - Google Patents

Description

  The present invention relates to a cutter head for a remodeling propulsion machine that renews an existing pipe that has been aged without cutting into a new pipe, and in particular, when the existing pipe that has aged is a PVC pipe, The present invention relates to a cutter head for propulsion of an existing pipe that enables smooth propulsion by making fine chips when cutting with a cutter.

Pipes that are buried underground as lifelines for water and sewage, gas, etc., are aging due to aging, so it is necessary to replace them with new pipes in a timely manner before their service life is exceeded.
In the past, in order to renew old pipes, they were excavated from the surface and dug into existing pipes. Recently, a renovation promotion method has been developed in which an existing pipe is crushed and a renewal pipe is promoted at the same time without cutting.

  There are various conventional methods for promoting the reconstruction of existing pipes, and a construction method for promoting an updated pipe while cutting an existing pipe with a cutter is becoming common.

  Examples of this type of reconstruction promotion method include the method disclosed in Patent Document 1. A cutter head for crushing the existing pipe is attached to the tip of the tip pipe used in this reconstruction promotion method, and the existing pipe is crushed with a cutter of this cutter head, and the fragments and earth and sand are for soil removal. It is transferred to the starting counter by a screw. And a propulsion machine gives a driving force to a new renewal pipe simultaneously with crushing of a buried pipe, and pushes in a renewal pipe instead of a crushed buried pipe.

  According to this reconstruction promotion method, the existing pipe can be crushed with a cutter, and the renewal pipe can be promoted while discharging the chips. Therefore, even if the existing pipe is bent, the renewal pipe can be embedded accurately. There is an advantage that the renewal pipe can be promoted regardless of the diameter of the existing pipe.

JP 2006-249678 A

  However, there are various types of existing pipes that have deteriorated, such as ceramic pipes, fume pipes, and pipes made of vinyl chloride as the age goes by. Of these, ceramic pipes and fume pipes are suitable for crushing with a cutter because they are easy to crush finely.

  On the other hand, when the existing pipe made of vinyl chloride is cut with a cutter, continuous elongated chips are generated. Moreover, it becomes difficult for the chips to be discharged due to accumulation in the existing pipe or entanglement with the screw for earth removal. In the worst case, a clogging may occur in the casing containing the screw, making it impossible to continue propulsion.

  Therefore, the object of the present invention is to solve the problems of the prior art, and when renewing an aged vinyl chloride tube, it is a shape that is cut into short pieces without becoming continuous chips even when cutting with a cutter. It is an object of the present invention to provide an existing pipe reconstruction promotion cutter head which can be easily discharged with a screw.

In order to achieve the above object, the present invention provides a cutter head for use in a remodeling propulsion device that pushes a new renewal pipe together with a preceding pipe while cutting or crushing an existing pipe buried in the ground, Cutting having a roller-shaped cutter body, a roller-type cutter in which a plurality of pressing teeth are formed in the axial direction on the end face of the existing pipe by pressing, and a linear cutting blade. And a bit, and is arranged on the face plate of the cutter head, and the roller type cutter is rotatably mounted on the face plate so that the roller type cutter is positioned on the radius of the face plate of the cutter head, and the roller type cutter The tooth height of the pressing tooth is set to be higher than the height of the cutting blade of the cutting bit .

  In the present invention, the roller-type cutter is characterized in that a plurality of pressing teeth are formed in a cylindrical gear shape at a constant pitch on the cutter body.

  In the present invention, the cutting bit is a flat claw-shaped cutting bit.

  It is preferable that the roller cutter is attached to the face plate in an attitude that is inclined upward toward the rotation center of the face plate.

  According to the present invention, when renewing an aged vinyl chloride tube, even if it is cut with a cutter, it becomes a piece of short shredded shape without being continuously cut and can be easily discharged with a screw. Can do.

It is a side view which shows the propulsion machine with which the cutter head for existing pipe reconstruction promotion of this invention is applied. FIG. 2 is a longitudinal sectional view of a leading conduit and a cutter head connected to the propulsion device of FIG. 1. It is a front view of the cutter head for existing pipe reconstruction promotion of the present invention. It is a cross-sectional view of the roller type cutter attached to the cutter head of FIG. Explanatory drawing of the cutting action of the cutter head by this invention. Explanatory drawing of the effect | action with respect to the stainless steel collar of the cutter head by this invention.

DESCRIPTION OF EMBODIMENTS Hereinafter, an embodiment of an existing pipe remodeling promotion cutter head according to the present invention will be described with reference to the accompanying drawings.
FIG. 1 shows an existing pipe remodeling propulsion machine in which the cutter head of the present invention is used.
In FIG. 1, reference numeral 10 indicates the entire propulsion device. As this propulsion device 10, a well-known propulsion device widely used in a construction method for propelling a buried pipe into the ground without cutting is used. Reference numeral 50 is an aging existing pipe. The existing pipe 50 of this embodiment is assumed to be a vinyl chloride pipe, which is a typical pipe of a small diameter and low load bearing pipe. Reference numeral 60 indicates an update tube. The update pipe 60 is, for example, a fume pipe.

The start shaft 14 is cut at the start position of the renewal pipe 60, and the propulsion machine 10 is carried into the start shaft 14.
In the propulsion device 10, the propulsion device main body is movably installed on a guide frame 15 serving as a base. Hydraulic cylinders 16 that generate thrust to push the renewal pipe 60 are disposed on the left and right sides of the propulsion unit main body. The tip of the piston rod of the hydraulic cylinder 16 is fixed to the reaction force receiver 17.

  An attachment having the following configuration is connected to the propulsion device 10. That is, the attachment is composed of the cutter head 20, the leading conduit 21, and the renewal pipe 60 that is added one by one in order from the top.

  Next, FIG. 2 shows a longitudinal section of the leading conduit 21. The leading conduit 21 is connected to the leading update tube 60. A cutter head 20 is attached to the tip of the leading conduit 21. The cutter head 20 rotates integrally with the screw 22. A spiral blade 23 extends in the axial direction on the screw 22. The screw 22 is accommodated coaxially in the casing 24. The screw 22 and the casing 24 extend to the propulsion device 10 inside the renewal pipe 60.

  The driving torque of the hydraulic motor provided in the propulsion device 10 is transmitted to the screw 22 via a hollow speed reducer (not shown). At the same time, the thrust generated by the hydraulic cylinder 16 from the propulsion device 10 is applied to the update pipe 60. The renewal pipe 60, the casing 24, and the screw 22 are propelled while being added one by one as the propulsion is extended.

  The leading conduit 21 is provided with a plurality of direction correcting cylinders 25 in order to make the propulsion direction correspond to the inclination of the existing pipe 50, and by operating the direction correcting cylinders 25, the cutter head 20 is moved. The propulsion direction can be corrected by tilting.

Next, the cutter head 20 according to the present embodiment will be described.
The cutter head 20 includes a disk-shaped face plate 30 constituting a head body, and a bearing support mechanism portion 32 that rotatably supports the face plate 30.

  As shown in FIG. 2, the bearing support mechanism 32 incorporates a thrust bearing 35 that receives an axial thrust load that acts during propulsion and a radial bearing 33 that receives a radial load.

As shown in FIG. 3, the face plate 30 is attached with a cutting tool combining different types.
In FIG. 3, reference numeral 36 indicates a roller-type cutter, and reference numeral 40 indicates a cutting bit.

First, the roller-type cutter 36 has a roller-shaped cutter body, and has pressing teeth 36a that are bitten by pressing. The teeth of the pressing tooth 36a extend in parallel to the axial direction of the cutter body. FIG. 4 shows a cross section of the roller cutter 36. In the roller type cutter 36 of this embodiment, twelve pressing teeth 36a are formed at a constant pitch, and constitute a cutter having a cylindrical gear-like outer shape as a whole. The roller cutter 36 can be rotated by supporting both ends of the rotating shaft 37 by the support portions 38a and 38b. The rotation shaft 37 of the roller cutter 36 is located on the radius of the face plate 30.
Next, as the cutting bit 40, a so-called flat claw-shaped cutting bit is used. This cutting bit 40 is a cutting bit having one cutting blade 40a extending linearly.

  In the present embodiment, two roller cutters 36 are arranged symmetrically by 180 degrees with respect to the rotation center of the face plate 30. Two cutting bits 40 are disposed at positions 180 degrees symmetrical with respect to the rotation center of the face plate 30 so as to be displaced by 90 degrees with respect to the roller cutter 36. Further, the roller cutter 36 and the cutting bit 40 are attached to the face plate 40 in an attitude that is inclined upward toward the rotation center of the face plate 30 (see FIG. 2).

  As shown in FIG. 3, the face plate 30 has an opening 42 for introducing earth and sand and chips. Further, behind the face plate 30, a blade edge 44 that forms an inlet for the screw 22 is defined, and earth and sand and chips are introduced into the screw 22 from the blade edge 44.

The existing pipe rebuilding promotion cutter head 20 according to the present embodiment is configured as described above. Next, the renewal pipe along the existing pipe 50 made of vinyl chloride that has been aged using the cutter head 20. The process of promoting 60 and remodeling the sewer pipe will be explained step by step.
First, as shown in FIG. 1, the start shaft 14 is excavated at the start end position of the existing pipe 50. The propulsion device 10 is installed in the start shaft 14.

  In the propulsion device 10, while cutting the existing pipe 50 while rotating the cutter head 20 together with the screw 22, the piston rod of the hydraulic cylinder 16 of the propulsion device 10 is extended to propel the leading conduit 21. The renewal pipe 60, the screw 22, and the casing 24 are sequentially promoted without being added while the advancement of the leading conduit 21 is extended.

  Conventionally, in the existing pipe 50 made of a soft resin material such as vinyl chloride, the chips are often long continuous chips.

  On the other hand, in the cutter head 20 of the present embodiment, the roller type cutter 36 and the cutting bit 40 are combined. Therefore, the cutting action of the roller type cutter 36 and the cutting bit 40 cooperates as follows. Thus, the chips can be shredded short and can be smoothly discharged backward by the screw 22.

Here, FIG. 5 is a diagram illustrating the cutting action of the roller cutter 36 and the cutting bit 40.
When the cutter head 20 is rotated while pressing the end face of the existing pipe 50 made of vinyl chloride, first, the roller-type cutter 36 rolls on the end face of the existing pipe 50, and the pressing teeth 36a bite into the end face. Thus, the grooves 52 are formed one after another. In this way, the roller type cutter 36 exclusively functions to form the grooves 56 one after another on the end face of the existing pipe 50.

  As shown in FIG. 5, the cutting bit 40 cuts between the grooves 52 with a cutting blade 40a following the cutting of the groove 56 by the roller cutter 36. In the case of this cutter head 20, since the height of the pressing teeth 36a of the roller type cutter 36 is slightly higher than the height of the cutting blade 40a of the cutting bit 40, by pressing the roller type cutter 36, The roller cutter 36 forms a groove 52 that is deeper than the cutting depth of the cutting bit 40. For this reason, when the cutting bit 40 cuts between the adjacent grooves 52, it becomes intermittent cutting between the grooves 52, and the chips do not continue and correspond to the interval of the grooves 52. The resulting short chip 70 is obtained.

  Thus, when the cutting of the existing pipe 50 made of vinyl chloride is continued by the cooperation of the roller cutter 36 and the cutting bit 40, the chips 70 are discharged from the opening 42 to the rear of the face plate 30 together with earth and sand. And it guide | induces to the screw 22 from the blade opening 44, and is conveyed back with earth and sand by rotation of the screw 22. FIG.

  As described above, even with the existing pipe 50 made of vinyl chloride, the chips 70 are not continuously long and are fragmented shortly, so that the discharging performance with the screw 22 is improved and the cutting is performed. It is possible to prevent a situation in which scraps are entangled with the blades of the screw 22 and cannot be discharged.

  The above description is about the cutting of the vinyl chloride pipe, but the cutter head 20 of the present embodiment can also deal with a vinyl chloride pipe in which a stainless steel collar is fitted in a joint portion or the like.

Here, FIG. 6 is a diagram schematically showing the action of the roller cutter 36 on the stainless steel collar 80.
Since the roller cutter 36 is attached so as to have an upward slope toward the rotation center of the face plate 30, when the roller cutter 36 is pressed against the end surface of the stainless steel collar 80 in FIG. Has an axial component F1 and a radial component F2. Of the pressing force F, the axial component F1 serves as a force for forming a groove in the end face of the stainless steel collar 80, and the radial component F2 serves as a force for pushing the stainless steel collar 80 outward in the radial direction.

  Therefore, by pressing the roller cutter 36, the stainless steel collar 80 can be cracked and expanded from the groove cut into the end surface of the stainless steel collar 80, and pushed out of the course of the renewal pipe. The stainless steel collar 80 pushed out of the course is promoted by the renewal pipe while remaining as it is.

  In this way, the vinyl chloride tube can be cut simultaneously while the stainless collar 80 is expanded.

  DESCRIPTION OF SYMBOLS 10 ... Propulsion machine, 14 ... Starting shaft, 15 ... Guide frame, 16 ... Hydraulic cylinder, 20 ... Cutter head, 21 ... Lead pipe, 22 ... Screw, 23 ... Blade, 30 ... Face plate, 32 ... Bearing support mechanism, 36 ... Roller-type cutter, 36a ... pressing tooth, 40 ... cutting bit, 40a ... cutting blade, 50 ... existing pipe, 52 ... groove, 60 ... update pipe

Claims (4)

While cutting or crushing existing pipes buried in the ground, at the same time, in the cutter head used in the renovation propulsion device that propels a new renewal pipe with the leading pipe to be preceded,
Cutting having a roller-shaped cutter body, a roller-type cutter in which a plurality of pressing teeth are formed in the axial direction on the end face of the existing pipe by pressing, and a linear cutting blade. And a bit, and is arranged on the face plate of the cutter head, and the roller type cutter is rotatably mounted on the face plate so that the roller type cutter is positioned on the radius of the face plate of the cutter head, and the roller type cutter An existing pipe remodeling promotion cutter head characterized in that the tooth height of the pressing tooth is set to be higher than the height of the cutting blade of the cutting bit .   2. The existing pipe remodeling promotion cutter head according to claim 1, wherein the roller type cutter is a cutter having a plurality of pressing teeth formed in a cylindrical gear shape at an arbitrary pitch on the cutter body.   The existing pipe remodeling promotion cutter head according to claim 1, wherein the cutting bit is a flat claw-shaped cutting bit.   The existing pipe remodeling promotion cutter head according to claim 1, wherein the roller type cutter is attached to the face plate in a posture inclined upwardly toward the rotation center of the face plate.

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