JP6087195B2 - Drilling head of buried pipe reconstruction propulsion machine - Google Patents

Description

  The present invention relates to an excavation head of a buried pipe reforming propulsion machine, and in particular, an existing buried pipe in which a metal collar is used for a joint portion of the pipe can be efficiently updated to a new pipe. It is related with the excavation head of the buried pipe reconstruction propulsion machine.

  Water and sewer pipes are affected by earthquakes and roads on the ground, and are aging due to secular changes. For this reason, existing buried pipes with a legal useful life of 50 years need to be renewed as appropriate before the useful life is exceeded. In the case of renewing such existing buried pipes, conventionally, after excavating and removing existing buried pipes by excavation from the ground surface, new pipes have been buried again. A construction method is adopted in which existing pipes are crushed while excavating, and at the same time, renewal pipes are promoted and remodeled.

FIG. 7 is a diagram showing an outline of a conventional general buried pipe reconstruction promotion method.
In FIG. 7, reference numeral 1 indicates an existing buried pipe. In the reconstruction promotion method for existing buried pipes, first, the start shaft 4 is excavated from the ground surface G. A propulsion unit 5 is installed in the start shaft 4. One renewal pipe 6 which is a new sewer pipe is added to the propulsion unit 5 one by one. Reference numeral 10 indicates a leading conduit. This tip conduit 10 is connected to the tip of the renewal pipe 6 propelled into the ground.

  A casing 12 is coaxially inserted into the front conduit 10, and a screw for discharging the earth and sand generated when excavating the ground and the crushed debris of the existing buried pipe 1 to the rear of the casing 12. 14 is inserted. Blades 16 are spirally connected to the screw 14.

  Further, the propulsion unit 5 is provided with a drive motor 17, a reduction gear 18, and a propulsion hydraulic cylinder 19. Among these, the rotation of the drive motor 17 is decelerated by the speed reducer 18 and transmitted to the screw 14. Thereby, the excavation head 8 provided at the tip of the screw 14 and the tip conduit 10 can be rotationally driven. The propulsion hydraulic cylinder 19 pushes the entire main body of the propulsion unit 5 in the left direction in the figure. As a result, a thrust necessary for propelling the leading conduit 10 and the subsequent renewal pipe 6 is given, and the existing ground pipe 1 is crushed by the bit cutter 8a provided on the front surface of the excavation head 8 while surrounding the ground. , The knitting tube comprising the leading conduit 10 and the renewal tube 6 can be propelled forward. The earth and sand generated at this time and the crushed debris of the buried pipe 1 are taken into the interior of the front conduit 10 and are transferred to the rear start shaft 4 through the inside of the casing 12 as the screw 14 rotates.

  Once the distance for one renewal tube 6 has been propelled, the propulsion is interrupted. And the operation | work which retracts the propulsion machine 5 and adds the new update pipe | tube 6 is implemented. Thereafter, the propulsion process of the update pipe 6 described above is repeated.

  In this type of existing buried pipe reconstruction promotion method, when the existing buried pipe is a fume pipe, the concrete of the pipe body is crushed and the rebar is cut efficiently with the excavation head at the tip of the tip pipe. For example, an excavation head that can finely crush concrete and reinforcing bars with a roller cutter as described in Patent Document 1 is used.

  By the way, the existing buried pipe is not only a fume pipe but also a pipe in which a vinyl chloride pipe is connected by a metal collar made of iron or stainless steel. When this kind of existing buried pipe is crushed with a bit cutter, which is a general cutter, it is very difficult to crush by cutting an iron or stainless steel collar, even though it is easy to crush the vinyl chloride pipe. .

  Conventionally, special cutter heads using tricorn bits, star cutters, wave cutters, etc. have been developed, but even with such special cutter heads, iron and stainless steel collars are cut. It is difficult to put it to practical use.

  Therefore, instead of cutting the collar, as described in Non-Patent Document 1, a pipe that is one step larger than the outer diameter of the existing buried pipe is propelled, and the existing buried pipe is taken as it is or crushed and collected inside. Then, as described in the pulling-out propulsion method of putting a new pipe into the pipe that has been propelled, or as described in Non-Patent Document 2, the existing buried pipe is pushed and expanded from the inside, and the new pipe is put in it. Application of the static crushing propulsion method is under consideration.

JP-A-9-296687

No-Dig Today October 2012, p. 46, Japan Non-Machining Technology Association No-Dig Today 2012 October, 14 pages, Japan Non-Machining Technology Association

  However, the pull-out propulsion method requires two steps of propulsion and recovery, and there is a disadvantage that efficient reconstruction cannot be performed. The static crushing propulsion method makes it difficult to construct existing pipes with large bends. There is a serious drawback in that it takes a lot of time and effort to correct the bend.

  Therefore, the object of the present invention is to eliminate the problems of the prior art and to cut a metal collar even in an existing buried pipe in which a pipe body such as a vinyl chloride pipe is connected with a metal collar. Instead, the object is to provide an excavation head for a buried pipe remodeling propulsion machine that efficiently removes an existing buried pipe and renews it with a new pipe by splitting in the axial direction so as to push.

  In order to achieve the above-described object, the present invention provides a drilling head that is provided with a casing through which a screw is inserted into a leading conduit and an update pipe, and is connected to the tip of the screw, and is used for grounding while crushing an existing buried pipe. In the excavation head of the buried pipe remodeling propulsion machine for propelling the renewal pipe therein, a conical face plate having a tapered outer surface inclined downward toward the outer peripheral portion, and a bit having a cutting edge of a cemented carbide tip The cutter comprises a plurality of bit cutter rows extending in the radial direction of the face plate, and a cutting blade extending in the radial direction of the face plate at the tip of the plate-like cutter body, the longitudinal direction of the cutter body being The rear end of the cutter body is fixed to the screw front end so as to be parallel to the axial direction of the screw, and the cutting blade protrudes from the face plate as the screw advances. And it is characterized by comprising a pair of wedge cutters capable of dividing pushes the buried pipe in the axial direction.

It is sectional drawing which shows the excavation head of the buried pipe reconstruction propulsion machine by embodiment of this invention, and is a figure which shows the state which the wedge cutter retracted. It is sectional drawing which shows the excavation head of the buried pipe reconstruction propulsion machine by embodiment of this invention, and is a figure which shows the state by which the wedge cutter was extruded. It is a front view of the excavation head of the buried pipe reconstruction propulsion device according to the embodiment of the present invention. It is IV-IV sectional drawing in FIG. It is a side view which shows the cylinder for adjustment of the buried pipe reconstruction propulsion machine utilized in order to operate a wedge cutter. It is a figure which shows the condition where a wedge cutter pushes and breaks a metal collar. It is a longitudinal cross-sectional view which shows the outline | summary of a general buried pipe reconstruction propulsion machine.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, an embodiment of an excavation head of a buried pipe reforming propulsion device according to the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a view showing a cross-section of the distal end portion of a leading conduit 10 to which the excavation head according to the present embodiment is applied. As shown in FIG. 7, the leading conduit 10 is attached to the top of the renewal pipe 6 and is propelled by using the propulsion 5.

  The leading end of the leading conduit main pipe 23 of the leading conduit 10 is connected to a blade edge tube 24 constituting the leading conduit 10 together with the leading conduit main pipe 23. The following excavation head 20 is configured at the tip of the blade tube 24.

  The excavation head 20 includes a face plate 25 to which a plurality of bit cutters 22 are attached, and a connecting shaft 26 that connects the face plate 25 to the screw 14.

  A bearing 28 that rotatably supports the face plate 25 of the excavation head 20 is provided at the rear end of the blade tube 24. In this embodiment, the outer ring of the bearing 28 is fixed to the inner peripheral surface of the blade tube 24. The inner ring of the bearing 28 is connected to the four head support members 30 via bearing retainers 29. The head support member 30 extends in the axial direction to the tip of the blade tube 24 and is fastened to the face plate 25 via bolts.

  The face plate 25 is configured as a conical face plate, and its outer surface is inclined downward toward the outer periphery. As shown in FIG. 3, in this embodiment, four cutter rows each including one set of bit cutters 22 are arranged on the outer surface of the face plate 25. Each cutter row is symmetrically arranged so as to be shifted by 90 degrees with respect to the center of the face plate 25. In each cutter row, the cutting edge 22a of the bit cutter 22 is formed by a cemented carbide chip and is continuous in a straight line. It has become. Openings 32 for taking in the earth and sand are opened on the cutting blade 22a side of each cutter row. These openings 32 are relatively small openings having an opening area limited in width and length. In FIG. 3, reference numeral 34 is a loading / unloading port for loading / unloading the wedge cutter 36 described below, unlike the opening 32 for taking in the earth and sand.

  Next, the configuration of the wedge cutter 36 will be described with reference to FIGS. 1 and 2. In this embodiment, the two wedge cutters 36 are arranged 180 degrees symmetrically with respect to the center of the face plate 25.

The wedge cutter 36 is a rectangular plate-shaped cutter. In this wedge cutter 36, a cutting edge 36 a is formed in the short direction at the tip of the cutter body, and this cutting edge 36 a is inclined so as to correspond to the inclination angle of the face plate 25, and radially outward. It is inclined downward. The wedge cutter 36 is fixed to a bracket 38 whose rear end is fitted to the shaft of the screw 14 in a posture in which the longitudinal direction thereof is parallel to the axial direction of the screw 14.
As shown in FIG. 1 and FIG. 4 representing the VI-VI cross section in FIG. 1, a screw shaft 14a which is a hollow shaft is connected to the tip of the screw 14. The shaft hole 40 of the screw 14a is a shaft hole having a polygonal cross section such as a hexagon. The connecting shaft 26 integral with the face plate 25 is a shaft having the same polygonal cross section corresponding to the cross sectional shape of the shaft hole 40, and is slidable and capable of transmitting rotation to the shaft hole 40. It is mated. By adopting such a connection structure, the rotation of the screw 14 is transmitted to the connection shaft 24 integral with the face plate 23. Further, the axial movement of the screw 14 is allowed, and the cutting edge of the wedge cutter 36 can be pushed out from the face plate 25 by the advance of the screw 14 (see FIG. 2).

  FIG. 5 shows an adjustment cylinder 44 provided in the propulsion device 5. This adjustment cylinder 44 is originally a cylinder for adjusting the position of the speed reducer 18 by moving the position of the speed reducer 18 back and forth when the screw 14 is connected. In the present embodiment, the adjustment cylinder 44 is It is used as a driving source for operating the wedge cutter 36 by moving the screw 14 forward or backward.

  The excavation head of the buried pipe reconstruction propulsion device according to the present embodiment is configured as described above, and the operation and effect thereof will be described next.

  In this embodiment, the pipe body of the existing buried pipe 1 is a pipe made of vinyl chloride, and a metal collar 2 made of iron, stainless steel or the like is used as a joint of the vinyl chloride pipe 1a. As shown in FIG. 7, when the knitting pipe composed of the leading pipe 10 and the renewal pipe 14 is propelled forward while crushing the buried pipe 1, the excavation head 20 is made of a vinyl chloride pipe as follows. Cutting or crushing 1a and cutting of the metal collar 2 can be performed.

First, the case where the vinyl chloride pipe 1a which is the pipe body of the existing buried pipe 1 is cut or crushed by the excavation head 20 will be described with reference to FIG.
As shown in FIG. 1, the wedge cutter 36 is drawn into the blade tube 24 and is held in the retracted position. At this time, the cutting edge 36 a of the wedge cutter 36 is located at a position lower than the cutting edge 22 a of the bit cutter 22. For this reason, the cutting edge 22a of the bit cutter 22 is exclusively contacted with the vinyl chloride pipe 1a without contacting the cutting edge 36a of the wedge cutter 36.

  Therefore, when the screw 14 rotates, the rotation of the screw 14 is transmitted to the face plate 25 through the connecting shaft 26 with which the tip of the screw 14 is fitted. The ground can be excavated while cutting the vinyl chloride pipe 1a by the bit cutter 22 of the rotating face plate 25. Since the vinyl chloride pipe 1a itself is soft, it can be efficiently cut by the bit cutter 22.

  At this time, earth and sand or cutting waste from the vinyl chloride pipe 1 a is taken into the blade pipe 24 from the opening 32 (see FIG. 3) of the face plate 25 and transferred backward by the blades 19 of the screw 14.

Next, a case where the metal collar 2 at the joint of the vinyl chloride pipe 1a is cut by the excavation head 20 will be described with reference to FIG.
The metal collar 2, particularly the stainless steel collar, is very sticky and cannot be cut with the bit cutter 22. For this reason, when the vinyl chloride pipe 1a is cut with the bit cutter 22 as described above, the bit cutter 22 eventually hits the metal collar 2 and cannot be further promoted.

  Therefore, in the excavation head 20 of this embodiment, instead of cutting the metal collar 2 with the bit cutter 22, the wedge cutter 36 is pushed out as follows to cut the end face of the metal collar 2. Instead of splitting, it is split in two axial directions from the end face.

  First, the propulsion of the leading conduit 10 is interrupted once. On the other hand, the screw 14 is advanced while the rotation of the screw 14 is stopped. As the screw 14 advances, the wedge cutter 36 is pushed out from a loading / unloading port 34 opened in the face plate 25. If the force is concentrated at the point where the cutting edge 36a of the wedge cutter 36 contacts the end face of the collar 2, the collar 2 will not be crushed even if force is applied from this direction. Can be divided into directions. And since the wedge cutter 36 is arrange | positioned 180 degrees symmetrically with respect to the axis line of the screw 14, it acts so that the collar 2 may be divided into two parts in a semicylindrical shape. When the wedge cutter 36 is further pushed out and the collar 2 is pushed, the collar 2 is finally divided into two semicylindrical shapes as shown in FIG. When the collar 2 is pushed and broken by the wedge cutter 36, the vinyl chloride tube 1a is naturally cut in the axial direction.

  In this way, the wedge cutter 36 pushes and breaks the metal collar 2 into two parts, and then the screw 14 is retracted to draw the wedge cutter 36 into the blade tube 24.

  Next, the rotation of the screw 18 is restarted, and the rotation of the screw 14 is transmitted to the face plate 25 along with the propulsion of the leading conduit 10. The bit cutter 22 swivels together with the face plate 25, and the cutting blade 22a of the bit cutter 22 cuts the vinyl chloride pipe 1a finely while excavating the ground. These pieces of debris are taken into the blade tube 24 from the opening 32 of the face plate 25 together with earth and sand, and transferred backward by the blades 16 of the screw 14. In addition, since the opening area of the opening portion 32 of the face plate 25 is limited so that the pressed collar 2 does not enter, the divided collar is taken in and the discharge of earth and sand by the screw 14 is hindered. There is no.

  During this time, the metal collar 2 that has already been divided into two parts is pushed by the bit cutters 22 arranged on the inclined surface of the conical face plate 25 in a state inclined with respect to the propulsion direction, and propels the leading conduit 10. Therefore, the metal plate 2 is pushed away toward the outer side in the radial direction of the face plate 25, so that the metal collar 2 can be prevented from becoming an obstacle to excavation promotion.

  In addition, since the dividing direction for dividing the metal collar 2 is limited to the vertical direction, when there is another buried object in the vicinity of the buried pipe 1, the buried object is damaged. Therefore, safe construction can be carried out.

  According to the excavation head 20 of the present embodiment, the bit cutter 22 attached to the face plate 25 does not cut the metal collar 2, but exclusively cuts the vinyl chloride pipe 1a which is the main pipe of the buried pipe 1. It is used to do. The metal collar 2, which is a difficult-to-cut material, is not cut, but the wedge cutter 36 is pushed out of the face plate and is divided in two by being pushed in the axial direction.

  Thus, since the metal collar 2 is not cut by the bit cutter 22, the bit cutter 22 is less likely to be worn or damaged, and can be made to last for a long time. In addition, instead of cutting the metal collar 2, the wedge cutter 36 divides it vertically and pushes it away from the outer periphery of the excavation head 20, so that it is conventionally difficult to cut because it is difficult to cut. Even in the case of a buried pipe having a metal collar 2 that has been extremely difficult, it is possible to proceed with the reconstruction promotion work very efficiently.

  DESCRIPTION OF SYMBOLS 1 ... Existing buried pipe, 1a ... Vinyl chloride pipe, 2 ... Collar, 4 ... Starting shaft, 5 ... Propulsion machine, 6 ... Update pipe, 10 ... Lead pipe, 12 ... Casing, 14 ... Screw, 16 ... Blade | wing, 17 DESCRIPTION OF SYMBOLS ... Drive motor, 18 ... Reduction gear, 19 ... Propulsion hydraulic cylinder, 20 ... Excavation head, 22 ... Bit cutter, 24 ... Blade tube, 25 ... Face plate, 28 ... Bearing, 30 ... Head support member, 32 ... Opening , 34 ... loading / unloading port, 36 ... wedge cutter, 40 ... shaft hole, 42 ... connecting shaft, G ... ground surface

Claims (5)

An excavation head connected to the tip of the screw, provided with a casing through which a screw is inserted in the leading conduit and the renewal pipe, and propulsion of the renewal pipe into the ground while crushing the existing buried pipe. In the drilling head of the machine,
A conical face plate having a tapered outer surface inclined downwardly toward the outer periphery;
A bit cutter having a cutting edge of a cemented carbide tip, and a plurality of bit cutter rows extending in the radial direction of the face plate,
A cutting edge extending in the radial direction of the face plate is provided at the tip of the plate-like cutter body, and the rear end of the cutter body is parallel to the axial direction of the screw. And a pair of wedge cutters that are capable of splitting the embedded pipe in the axial direction, the cutting blade protruding from the face plate as the screw advances, and the embedded pipe remodeling propulsion machine Drilling head.   The existing buried pipe is a buried pipe in which a pipe made of vinyl chloride is connected via a metal collar, and the wedge cutter pushes and splits the metal collar in the axial direction. The excavation head of the underground pipe reconstruction propulsion machine according to 1. The face plate is integrally formed with a connecting shaft for transmitting the rotation of the screw to the face plate of the excavation head, and the connecting shaft is fitted to the tip of the screw so as to be slidable in the axial direction and to transmit the rotation. The excavation head of a buried pipe remodeling propulsion machine according to claim 1, wherein the advancing and retreating operation of the wedge cutter together with the screw is allowed by combining.   The excavation head of a buried pipe remodeling propulsion device according to claim 3, wherein a position adjusting cylinder provided in the propulsion device is used as a drive source for driving the wedge cutter. The face plate takes in only the crushed material of the pipe body out of the buried pipe made of excavated earth and sand, a pipe body made of vinyl chloride and a metal collar as a joint of the pipe body, and is broken by the metal 2. The excavation head of a buried pipe remodeling propulsion machine according to claim 1, wherein an opening is formed to limit the intake of the collar.