JP2005076357A - Method for replacing buried pipe and cutter device for buried pipe replacement - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily and economically collect a cutter device for buried pipe replacement when generating a disorder in the cutter device. <P>SOLUTION: The cutter device 1 for the buried pipe replacement is provided with a leader connecting a buried pipe by having a cutter head, installed forward of a pipe jacking machine burying the buried pipe underground by excavating a ground with the cutter head while pipe-jacking the leader and the buried pipe, and used when burying a new buried pipe and replacing an existing buried pipe while breaking the existing buried pipe 101 with the cutter head of the leader. The cutter device is separately and independently from the leader and provided with a cut-off wall 5 for advancing the buried pipe separately from while enclosing the buried pipe 101 with a seal 6, and a cutter 2 attached to the cut-off wall and for inserting a notch 103 for the buried pipe 101. The cutter 2 can be retracted in a radial direction of the existing buried pipe 101. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a method for replacing a buried pipe in which a new buried pipe is buried and the buried pipe is replaced while destroying the existing buried pipe by using a pipe propulsion device, and a buried pipe replacing cutter used for carrying out the method. Relates to the device.

  When replacing an existing buried pipe such as a sewer pipe buried underground with a new buried pipe, the area where the existing buried pipe is buried was cut from the ground to the underground. Later, an excavation method was used in which the existing buried pipe was replaced with a new buried pipe and backfilled. Such a method of exchanging buried pipes by the excavation method has a problem that the ground is easy to loosen in addition to causing traffic congestion in urban areas.

  To solve these problems, the existing buried pipe is cut in the axial direction with a cutter and divided into a plurality of parts in the circumferential direction to make it easier to destroy the existing buried pipe. Recently, a method has been proposed in which a new newly installed underground pipe is propelled by a pipe propulsion machine and buried in the underground mine thus formed by crushing it with a body cutter head. Patent Document 1 discloses a method for replacing a buried pipe of this type and an apparatus used for carrying out the method.

  When the technique described in Patent Document 1 is described (the reference numerals used in Patent Document 1 are described in parentheses), this conventional technique is an existing underground underground pipe already embedded in the ground. (8) New underground pipe (9) (new underground pipe) with the same diameter as (existing underground pipe) is buried in the same position as the existing underground pipe (8). (9) is replaced. In this conventional technique, when the existing underground pipe (8) is replaced, the waterstop (4) that advances in the existing underground pipe (8) with the advance of the excavator (2) as the leading conductor, A device provided with a support member (10) and a chain cutter (3) attached to the support member (10) and axially cut so as to divide the existing underground pipe (8) into four parts in the circumferential direction. I use it. Specifically, this apparatus is provided with an excavator (2) provided with a large number of excavating blades (2a) in an annular shape, and a long support member (front and rear) so as to penetrate the inside of the annular excavating blade (2a). 10) Attach the rear end, attach the waterstop (4) to the tip of the support member (10), and attach the chain cutter (3) to the support member so that it is located behind the waterstop (4). It is made to attach at four places of the circumferential direction of (10).

Since the conventional technology employs such means, the waterstop (4) and the support member (10) are advanced together with the excavator (2) by propelling the excavator (2) with the propulsion device. The existing underground pipe (8) is cut in the axial direction with a chain cutter (3) to break the existing underground pipe (8). After that, by crushing the existing underground pipe (8) with the excavator blade (2a) of the excavator (2), the new underground pipe (9) is propelled together with the excavator (2) and buried. The existing buried pipe can be replaced with a new underground pipe (9) having the same diameter. Thus, the chain cutter (3), the waterstop (4), and the support member are used for pre-treatment so that the existing buried pipe can be easily broken with the tip conductor cutter when the existing buried pipe is replaced. In this specification, an apparatus composed of elements such as (10) is referred to as a buried pipe replacement cutter apparatus.
JP 2001-241290 A (page 3-5, FIG. 1-8)

  By the way, it is necessary for such a cutter device for exchanging buried pipes to have sufficient durability so as not to be damaged during use. However, since unexpected situations occur in the ground, it is difficult to completely prevent damage to the cutter device. Further, when exchanging the buried pipe over a long distance section, it is inevitable that the cutter is worn in the cutter apparatus for replacing the buried pipe. When a malfunction occurs in the cutter device for replacing the buried pipe due to the occurrence of such a situation, it is necessary to collect and repair or replace the cutter device. However, in the conventional technology, it is very difficult to collect the cutter device. Is accompanied.

  That is, when trying to recover the cutter device for replacing the buried pipe in the conventional technique, the cutter device must be withdrawn to the start shaft side with the leading conductor and the newly installed buried pipe and collected. The work takes a lot of time and effort. In addition, since a new underground pipe that has already been buried has to be pulled back to the start shaft side, labor and time spent for burying the buried pipe are wasted. For this reason, in the conventional technique, the recovery operation of the cutter device for replacing the buried pipe is difficult and extremely uneconomical.

  The invention of this application is intended to solve the problems found in the prior art, and the technical problem is to recover easily and economically when a malfunction occurs in the cutter device for replacing the buried pipe. An object of the present invention is to provide a buried pipe replacement cutter device that can be used, and a buried pipe replacement cutter device that is used for carrying out the method.

  In order to achieve such a technical problem, the invention of the buried pipe replacement method of this application according to claim 1 employs the following method 1), and the cutter apparatus for replacing buried pipes of this application according to claim 2 The invention of (2) is configured as the following 2).

1) A tip conductor having a cutter head at the front and a buried pipe connected to the rear is provided, and the buried pipe is buried in the ground by excavating a natural ground with the cutter head while propelling the leading conductor and the buried pipe. In the method of replacing a buried pipe, a new buried pipe is buried and the buried pipe is replaced while destroying the existing buried pipe with the cutter head of the conductor using a pipe propulsion device.
Leading the moving body in a cutter device for exchanging buried pipes, which is configured to have a movable body capable of moving forward in the buried pipe and a cutter attached to the movable body and capable of cutting into the existing buried pipe. After cutting the existing buried pipe with a cutter while advancing separately from the body, by pushing the leading conductor, the buried pipe with the cut is crushed with the cutter head of the leading conductor. While forming the underground mine, the newly installed buried pipe is pushed into the underground mine together with the leading conductor, so that the buried pipe is replaced, and when there is a malfunction in the cutter device for replacing the buried pipe, After the cutter attached to the device is retracted inside the inner peripheral surface of the existing buried pipe by remote control, the moving body is moved forward separately from the leading conductor, A cutter device for replacement tube so as to recover.

2) A tip conductor having a cutter head at the front and a buried pipe connected to the rear is provided, and the buried pipe is buried in the ground by excavating a natural ground with the cutter head while propelling the leading conductor and the buried pipe. Installed in front of the pipe propulsion machine, constructs a cutter for exchanging the buried pipe used when replacing the buried pipe by burying the new buried pipe while destroying the existing buried pipe with the cutter head of the conductor. In case,
A movable body that is configured to be separated and independent from the leading conductor and can be moved forward in the existing buried pipe separately from the leading conductor, and a cutter that is attached to the movable body and can cut the existing buried pipe And the cutter is configured to be able to appear and disappear in the radial direction of the existing buried pipe.

  In the invention of the buried pipe replacement method of the present application adopting the method of 1), the moving body of the cutter apparatus for replacing the buried pipe installed in the existing buried pipe is advanced, and the cutter attached to the movable body is used. Since the existing buried pipe is cut, the existing buried pipe that is difficult to crush can be pretreated so as to be easily crushed. Therefore, the existing buried pipe can be adjusted to a state where it can be easily crushed to the same extent as the surrounding natural ground. In the present invention, after pre-treating the existing buried pipe so as to be easily crushed, by pushing the leading conductor, the existing buried pipe is crushed with a cutter head to form an underground mine for burying the pipe. Then, the new buried pipe is pushed into the underground mine along with the leading conductor, and the buried pipe is replaced through this process. In that case, since the movable body of the cutter device for replacing the buried pipe is advanced in advance separately from the leading conductor, unlike the conventional technique, the leading conductor of the desired diameter is replaced with the existing buried pipe. By digging up a desired area that overlaps the existing buried pipe without being affected by the buried path and diameter of the existing pipe, the new buried pipe of the desired diameter is buried by the desired buried path, and the existing buried pipe is newly installed. It can be replaced with a buried pipe.

  In addition, during the operation of replacing the existing buried pipe, when a malfunction such as damage occurs in the cutter apparatus for replacing the buried pipe, the cutter attached to the cutter apparatus can be remotely controlled within the existing buried pipe. After retracting to the inside of the peripheral surface, the movable body is advanced separately from the leading conductor, so that the new buried pipe and the leading conductor that have already been buried and the cutter for replacing the buried pipe can be reached while remaining in the current position. Collect alone on the shaft side. Therefore, according to the buried pipe replacement method of the present invention, when a malfunction due to damage or the like occurs in the cutter apparatus for replacing the buried pipe, it can be easily and economically recovered unlike the conventional technique.

  Since the invention of the cutter for exchanging buried pipes configured as in 2) above is an apparatus used for carrying out the invention of the method for exchanging buried pipes described above, the cutter apparatus for exchanging buried pipes is provided. If the method shown in 1) above is carried out using a moving body or a cutter, the existing buried pipe can be replaced with a new buried pipe, and this is recovered when the cutter device malfunctions. In that case, the technical effects of the invention of this application can be achieved by achieving the above-described effects.

  As will be apparent from the following description, the buried pipe replacement method and the buried pipe replacement cutter apparatus of the invention of this application are shown in the section of “Means for Solving the Problems” 1) and 2), respectively. Therefore, when a malfunction occurs in the cutter device for replacing the buried pipe, it can be easily and economically recovered. For this reason, when the cutter of the cutter device for replacing the buried pipe is worn, the cutter can be easily replaced, and the buried pipe can be replaced smoothly over a long distance section. Furthermore, since the moving body can be advanced in the existing buried pipe separately from the leading conductor, the existing buried pipe depends on the buried route and the diameter, unlike the conventional technique. In addition to being able to be replaced with a new buried pipe having a desired diameter through a desired buried route, it can be replaced at a low cost without causing technical difficulties.

  Each invention of this application will be described below with reference to FIGS. 1 to 13 to explain how the inventions of the buried pipe replacement method and the buried pipe replacement cutter device of the present application are actually embodied. The embodiment of the present invention will be clarified.

  The invention of this application is a method for replacing a buried pipe, in which, as in the prior art described above, a new buried pipe is buried and the buried pipe is replaced while the existing buried pipe is destroyed with a cutter head using a pipe propulsion device. Further, the present invention relates to a buried pipe replacement cutter device used for carrying out the buried pipe replacement method.

  First, referring to FIG. 1 to FIG. 5, a cutter device for buried pipe replacement of the first example embodying the invention of the buried pipe replacement apparatus of this application, and the application of this application implemented using this apparatus. The buried pipe replacement method according to the invention will be described.

  FIG. 1 is a longitudinal sectional view showing a state in which a buried pipe replacement method is carried out using a cutter apparatus for replacing a buried pipe according to a first example embodying the invention of this application, and FIG. 1 is an enlarged view of the vicinity of the cutter device for replacing the buried pipe, FIG. 3 is a cross-sectional view taken along the line AA of FIG. 2, and FIG. 4 is a diagram showing the state when the cutter device for replacing the buried tube is recovered. FIG. 5 is a cross-sectional view taken along line BB in FIG.

  First, the general technical contents of the pipe propulsion device used in cooperation with the cutter apparatus for replacing the buried pipe will be outlined with reference to FIG.

  In order to carry out the pipe propulsion method, the pipe propulsion device has a leading conductor 20 provided with a cutter head 21 for excavating natural ground and a leading push for propelling the leading conductor 20 and the buried pipe 104 connected to the rear thereof. It is an apparatus comprised with the apparatus (not shown). When the pipe propulsion method is carried out by this pipe propulsion device, the buried pipe 104 formed of a fume pipe or the like is sequentially connected to the rear of the leading conductor 20, and the main pushing device installed in the start shaft (not shown). The ground in front is excavated by the cutter head 21 while propelling the buried pipe 104 and the leading conductor 20, and each buried pipe 104 is sequentially pushed into the ground and buried.

  The tube propulsion device shown in FIG. 1 is a small-diameter tube propulsion device that has been conventionally developed by the applicant. The cutter device 1 of each example, such as the cutter device 1 for replacing the buried pipe of the first example described later, is embodied so as to be suitable for such a small-diameter pipe propulsion device. Although this type of pipe propulsion device will be mainly described here, the buried pipe replacement cutter device of the invention of this application can be used in cooperation with other types of pipe propulsion devices.

  Accordingly, the small-diameter pipe propulsion machine shown in FIG. 1 is described. Reference numeral 20 denotes a front conductor having a cutter head 21 at the front and a new buried pipe 104 connected to the rear to dig in the ground. 20 is a cutter head that is driven to rotate and excavates a natural ground ahead, 22 is a cutter bit fixed to the cutter head 21 in large numbers, and 23 is a bite into the natural ground, so that the rotational reaction force of the cutter head 21 is reduced. A reaction force transmission plate 24, which has a projecting shape to be transmitted to the ground, is provided at the bottom of the rear side of the leading conductor 20, and is a sand intake port that takes in mud soil that has been generated near the face and passed through the outer peripheral side of the leading conductor 20 into the machine. It is.

  The cutter head 21 is configured such that the outer diameter of the excavation is larger than the outer diameter of the body of the leading conductor 20, and in combination with the provision of the reaction force transmission plate 23, An annular mud passage is formed between the hole wall of the excavation hole. In the central portion of the cutter head 21, a viscosity imparting liquid injection port for injecting the viscosity imparting liquid radially and injecting the viscosity imparting liquid into the excavation earth and sand is provided. When injected, the viscosity imparting liquid and excavated earth and sand are agitated and mixed by the cutter head 21 to impart viscosity to the excavated earth and sand. As a result, mud with plastic fluidity is generated in the vicinity of the face, and this mud is sent to the rear of the cutter head 21 and passes through the mud passage around the trunk of the leading conductor 20.

  The reaction force transmission plate 23 is formed so that the surface on the side facing the natural ground is a curved surface having a substantially arc-shaped cross section, and slightly protrudes from the excavation outer diameter of the cutter head 21. Therefore, the outer peripheral portion of the reaction force transmission plate 23 protruding from the outer diameter of the excavation bites into the natural ground around the excavation hole when the leading conductor 20 is excavated, and transmits the reaction force of the rotational torque of the cutter head 21 to the natural ground. Thus, rolling of the leading conductor 20 can be prevented. In addition, it supports the leading conductor 20 and forms a mud passage around the trunk of the leading conductor 20. A plurality of such reaction force transmission plates 23 are provided at predetermined intervals on the same outer peripheral surface of the body of the leading conductor 20.

  30 is an adapter for connecting a buried pipe attached to the rear end portion of the leading conductor 20, and 31 is a mud soil that is taken in from the earth and sand intake port 24 and pumped by a earth and sand pump (not shown) to the start shaft side. Drainage pipe, 100 is earth and sand of natural ground, 101 is made of unit length and is already buried in the ground, 104 is made of reinforced concrete that is made of unit length and is newly buried in the ground This is a new buried pipe.

  The adapter 30 functions to allow the buried pipe 104 to be connected to the rear of the leading conductor 20 by fitting the newly installed buried pipe 104. As with the buried pipe 104, the soil discharge pipe 31 is manufactured to a unit length. The new buried pipe 104 is connected to the rear of the leading conductor 20 in a start shaft not shown, and is propelled by a not-shown main pushing device in the start shaft while being sequentially added. At that time, the earth removal pipe 31 is sequentially added to the rear of the leading conductor 20 in a state of being laid inside the buried pipe 104.

  Since the pipe propulsion device has the above-described structure, when the leading conductor 20 is driven by the main pushing device and the cutter head 21 is rotationally driven to start, the leading conductor 20 forms an excavation hole in the natural ground. While digging. In the process of excavating the leading conductor 20 in this way, the newly installed buried pipe 104 is appropriately connected to the rear end of the leading conductor 20 together with the earth discharging pipe 31 via the adapter 30, and this time, the buried pipe 104 is propelled by the main pushing device. Thus, the ground is excavated by the cutter head 21 while the leading conductor 20 is being propelled. In the meantime, the viscosity imparting liquid is poured into the excavated earth and stirred and mixed by the cutter head 21, thereby generating mud with plastic fluidity in the vicinity of the face.

  If it does so, this mud will be sent back, it will be press-fitted and filled in the annular mud passage, and will pass through the passage. A portion of the mud is taken into the earth and sand intake port 24 at the rear of the leading conductor 20, and is pumped and discharged to the ground by a sand and sand pumping pump (not shown) in the leading conductor 20 through the discharge pipe 31, and the rest is led. The outer periphery of the body 20 is filled and sent to the outer periphery of the buried pipe 104. In the meantime, by controlling the amount of mud discharged with the earth pressure pump, the earth pressure (mud pressure) in the chamber formed between the excavation hole and the tip conductor 20 is adjusted to support the face with earth pressure. In this way, the pipe propelling machine digs up while supporting the natural ground with earth pressure and reducing the penetration resistance of the buried pipe 104 by the mud sent to the outer periphery of the buried pipe 104. The cutter apparatus 1 for replacing the buried pipe according to each example described below is designed to be used when the existing buried pipe 101 is broken by the cutter head 21 and replaced with the newly installed buried pipe 104 by such a small-diameter pipe propulsion device. ing.

  1 to 5 show a buried pipe replacement cutter device 1 of the first example used in cooperation with such a small-diameter pipe propulsion device and a buried pipe replacement method carried out by using this cutter device 1. Based on

  In these drawings, reference numeral 1 is used when an existing embedded pipe 104 is destroyed by a cutter head 21 with a pipe propulsion unit, and a new embedded pipe 104 is replaced with a new embedded pipe 104. Cutter device for buried pipe replacement, 2 is a cutter having a sharp blade attached to the water blocking wall 5 and capable of making a cut 103 in the existing buried pipe 101, 5 is configured separately from the leading conductor 20 The disc-shaped water stop wall 6 as a moving body capable of moving forward in the existing buried pipe 101 separately from the leading conductor 20 and moving the cutter 2 forward is attached to the outer periphery of the water stop wall 5. An annular seal that is in close contact with the inner peripheral surface of the existing buried pipe 101, 7 is a bracket for attaching wires 8 for attaching the wires 8, and 8 is a rope or chain for pulling the water blocking wall 5 forward. Wires for traction of the water blocking wall such as water, 9 is a chemical liquid injection port of the chemical liquid supply pipe 10 opened to the rear of the water blocking wall 5, and 10 is a chemical liquid supply pipe that is attached to the water blocking wall 5 and supplies chemical liquid , 101 is an existing buried pipe manufactured to a unit length and already buried in the ground.

  The cutter apparatus 1 for replacing the buried pipe is configured by providing a cutter 2 and a water blocking wall 5 as a moving body, and is installed in front of the leading conductor 20 when the existing buried pipe 101 is replaced with a new buried pipe 104. And used for pretreatment so as to facilitate the destruction of the existing buried pipe 101 by the cutter head 21 of the leading conductor 20. The cutter apparatus 1 for replacing the buried pipe according to the first example is used when the existing buried pipe 101 is a buried pipe having a lower strength than a reinforced concrete buried pipe such as a vinyl chloride pipe or a ceramic pipe. . In particular, the cutter 2 is attached to the water blocking wall 5 via support members 4a and 4b, which will be described later, so that the notch 103 can be inserted into the existing buried pipe 101 at the rear portion of the seal 6.

  Such a cutter 2 may be a slit-shaped cut 103, that is, a cut, or a line-shaped cut 103, that is, a cut. As shown in FIGS. 3 and 5, a plurality of cutters 2 are arranged radially from the center line of the water blocking wall 5 at predetermined intervals in the circumferential direction. The water blocking wall 5 is installed in the existing buried pipe 101 and functions as a moving body as described above. In addition, the water blocking wall 5 is installed at the rear of the water blocking wall 5 by sealing the pipe line of the buried pipe 101. It also serves to form a chamber for establishing earth pressure between the body 20 and the leading conductor 20 during excavation.

  The chemical solution supply pipe 10 supplies a chemical solution normally used in a pipe propulsion method or the like to improve the strength of the ground from the front of the water stop wall 5 to the rear of the water stop wall 5 through the chemical solution inlet 9. Examples of such chemical solutions include cement milk and cement / bentonite. When the chemical solution is supplied from the chemical solution supply pipe 10, the chemical solution is filled into the existing buried pipe 101 into which the cut 103 is made by the cutter 2 and oozes out from the cut 103 to the natural ground side.

  4a is a tiltable link-like movable support member that pivotally attaches one end and the other end to the cutter 2 and the connecting member 15 to support the cutter 2, and 4b rotates one end to the cutter 2. An arm-like fixed support member that supports the cutter 2 by fixing the other end to the water blocking wall 5 and 4c is a connecting pin for axially mounting the movable support member 4a and the fixed support member 4b, and 11 is a stroke. A hydraulic jack that is provided with a sensor (not shown) and drives the connecting member 15 to move back and forth, and 15 is a connecting member that connects one end of the cutter 2 to the tip of the rod 16 of the hydraulic jack 11.

  As shown in FIG. 4, when the hydraulic jack 11 is contracted and the connecting member 15 is advanced, the movable support member 4 a tilts so that one end portion is directed rearward around the connecting pin 4 c at the other end portion. Along with this, the cutter 2 rotates around the connecting pin 4c at one end of the fixed support member 4b and immerses in the radial direction of the existing buried pipe 101 to the inside of the inner peripheral surface of the buried pipe 101. Withdrawn. Further, as shown in FIG. 2, when the hydraulic jack 11 is extended and the connecting member 15 is retracted, the movable support member 4a is movable so that one end portion thereof faces up and down around the connecting pin 4c at the other end portion. The support member 4a is tilted so as to be vertical. Along with this, the cutter 2 rotates about the connecting pin 4c at one end of the fixed support member 4b and protrudes in the radial direction of the existing embedded pipe 101, so that the embedded pipe 101 can be cut. It shifts to the correct state. As described above, by providing the link mechanism including the support members 4a and 4b and the connecting member 15, the connecting member 15 can be moved back and forth so that the cutter 2 can be projected and retracted.

  Reference numeral 16 denotes a rod of the hydraulic jack 11 with the connecting member 15 fixed to the tip, 17 denotes a piston of the hydraulic jack 11 that can be reciprocated back and forth by a switching operation of the switching valve 19, and 18 denotes a slide in which the piston 17 is built. A tube of the hydraulic jack 11 that moves, 19 is an electromagnetically operated switching valve that can be switched so as to selectively supply the pressure oil of the hydraulic unit 40 to the bottom side of the tube 18 and the rod 16 side, A hydraulic unit comprising a hydraulic jack 11, a switching valve 19 and oil passages 41 and 42, 41 is connected to the switching valve 19 and supplies and discharges pressure oil on the bottom side of the tube 18, and 42 is a tube. 18 is an oil passage for supplying and discharging pressure oil on the rod 16 side, and 43 is a power cable for sending an electric signal for switching the switching valve 19.

  The switching valve 19 supplies pressure oil from a hydraulic pump (not shown) to the bottom side of the tube 18 from the oil passage 41 by an electrical signal sent from the power cable 43 and pressure oil on the rod 16 side of the tube 18. Is switched from the oil passage 42 to a hydraulic oil tank (not shown), and the hydraulic jack 11 is extended as shown in FIG. Further, the pressure signal from the hydraulic pump is supplied from the oil passage 42 to the rod 16 side of the tube 18 by the electrical signal from the power cable 43, and the pressure oil on the bottom side of the tube 18 is supplied from the oil passage 41 to the hydraulic oil tank. The hydraulic jack 11 is contracted as shown in FIG. The operation of the cutter apparatus 1 for exchanging the buried pipe, such as such an operation, is performed by remote control by operating an operation means of an operation panel (not shown) installed on the reach shaft or on the ground.

  When the buried pipe replacement method according to the invention of this application is carried out using the above-described buried pipe replacement cutter device 1, as a first step, the water blocking wall 5 to which the cutter 2 is attached is guided. It is installed in the existing buried pipe 101 in a state of being separated and independent from the body 20 to shield the pipe line of the buried pipe 101. In addition, as shown in FIG. 2, by switching the switching valve 19 and extending the hydraulic jack 11, the cutter 2 is projected in the radial direction of the existing buried pipe 101. In the second step, the water blocking wall 5 installed in the buried pipe 101 is pulled by the wires 8 and advanced separately from the leading conductor 20, and a cut 103 is made in the existing buried pipe 101 by the cutter 2. However, before and after this, the tip conductor 20 having a desired diameter is provided at the rear of the buried pipe 101 so as to be able to excavate a desired region overlapping with the existing buried pipe 101, so that it can be started at any time.

  Next, as a third step, the front conductor 20 is pushed and the front is excavated by the cutter head 21, while the viscosity imparting liquid is injected into the excavated material from the center of the cutter head 21 and stirred and mixed by the cutter head 21. Thus, mud soil with plastic fluidity is generated. In this way, while the earth conductor is generated in the chamber, the leading conductor 20 is promoted, and the existing buried pipe 101 that has been cut in the second step is crushed by the cutter head 21 to form an underground mine for pipe embedding. . At that time, an obstacle such as a large crushed piece of the buried pipe 101 is configured so that it can be pushed away to the periphery of the underground mine by the cutter head 21 of the leading conductor 20, and only the small-grained excavated matter is the leading conductor. 20 is taken into the rear part and discharged to the ground through the earthpipe 31. Thereafter, as a fourth step, the new buried pipe 104 is propelled together with the leading conductor 20 and pushed into the underground mine. As a result, the existing buried pipe 101 is replaced with the new buried pipe 104. In this buried pipe replacement method, the existing buried pipe 101 can be replaced by repeating these steps a desired number of times.

  On the other hand, when the malfunction is caused in the cutter device 1 for replacing the buried pipe during the operation of replacing the existing buried pipe 101 in this way due to damage or wear of the cutter 2, as shown in FIG. By retracting the hydraulic jack 11 by remote operation and retracting the cutter 2 attached to the cutter device 1 to the inside of the inner peripheral surface of the existing buried pipe 101, the water blocking wall 5 is moved forward separately from the leading conductor 20. The cutter apparatus 1 for replacing the buried pipe is recovered independently on the side of the reaching shaft while keeping the newly buried buried pipe 104 and the leading conductor 20 at the current position. In collecting, it is preferable to improve the ground by injecting a chemical solution into the front surface of the leading conductor 20 in order to prevent outflow of groundwater and collapse of ground. Therefore, according to this buried pipe replacement method, when a malfunction due to damage or the like occurs in the buried pipe replacement cutter device 1, unlike the conventional technique, it can be easily and economically recovered. In addition, since the cutter device 1 for replacing the buried pipe can be easily and economically recovered in this manner, the cutter 2 can be easily replaced when the cutter 2 is worn out. Replacement work can be performed smoothly over a long distance section.

  In this buried pipe replacement method, the water blocking wall 5 installed in the existing buried pipe 101 in the first process is advanced in the second process, and the existing buried pipe is attached by the cutter 2 attached to the water blocking wall 5. Since the notch 103 is made in the pipe 101, the existing buried pipe 101 which is difficult to be crushed can be pretreated so as to be easily crushed. Therefore, the existing buried pipe 101 can be adjusted to a state in which it is easily crushed to the same extent as the surrounding natural ground. Further, since the water blocking wall 5 is installed in the existing buried pipe 101, the pipe line of the existing buried pipe 101 is always sealed by the water blocking wall 5, so that the water blocking wall 5 and the pipe propulsion unit are sealed. A chamber is formed in a space between the first conductor 20 and the first conductor 20. Therefore, by injecting the viscosity imparting liquid from the tip conductor 20 into the excavated sediment in the chamber during the propulsion of the pipe propulsion machine, earth pressure for supporting the natural ground is generated in the chamber, and the natural ground collapse or It is possible to dig up the leading conductor 20 while preventing intrusion of groundwater.

  In this way, by adjusting the existing buried pipe 101 to be easily crushed by the cutter 2 attached to the water blocking wall 5 and forming a chamber in the space between the water blocking wall 5 and the leading conductor 20, Excavation conditions that approximate when 20 drills through normal ground can be created. The water blocking wall 5 installed in the existing buried pipe 101 can be advanced separately from the front conductor 20 in a state of being separated and independent from the front conductor 20 in particular. Unlike the case where the tip conductor 20 having a desired diameter is dug in a normal ground without depending on the burying route or the diameter of the existing buried pipe 101, the desired conductor overlapping the existing buried pipe 101 is desired. An area can be mined. Therefore, according to this buried pipe replacement method, the new buried pipe 104 having a desired diameter can be buried in a desired buried path, and the existing buried pipe 101 can be replaced with the new buried pipe 104.

  By the way, the existing buried pipe 101 can be crushed by the cutter head 21 of the leading conductor 20 and replaced with the new buried pipe 104 without making the notch 103. It is necessary to improve the ground so that the inner and outer peripheral zones have a substantially uniform supporting force by injection of filler. That is, when the leading conductor 20 includes a hard portion (a portion that is difficult to dig) and a soft portion (a portion that is easy to dig) in the face, the tip conductor 20 digs along the side road so that the soft portion is directed. In order to correctly dig the leading conductor 20 along the planned line, it is necessary to improve the ground so that the entire area near the existing buried pipe 101 has a substantially uniform supporting force by injection of a filler. Then, as long as such ground improvement is properly performed, the leading conductor 20 having a desired diameter is dug correctly along the planned line so as not to deviate from the side road, and as a result, a new buried pipe 104 having a desired diameter is installed. It is possible to embed according to the set desired route without being influenced by the burying route or the diameter of the burying tube 101.

  However, since the natural ground is not homogeneous, such as large and small voids and hard and soft soils mixed together, it has a substantially uniform bearing capacity around the existing buried pipe 101 by injection of filler. When trying to improve the ground, it is particularly difficult to adjust the entire outer peripheral portion of the existing buried pipe 101 to the same state as that of the buried pipe 101. Moreover, if it is going to achieve such a thing, an expensive filler will be required in large quantities, and it will become remarkably expensive, and there exists a problem in practical use.

  On the other hand, in the buried pipe replacement method according to the present invention, the existing buried pipe 101 that is difficult to be crushed is cut in the second step by the cutter 2 so that it is almost the same as the surrounding natural ground. Since the existing buried pipe 101 is pretreated so as to be easily crushed, the ground improvement is performed so that the inner and outer peripheral parts of the existing buried pipe 101 have a substantially uniform supporting force by injecting filler. However, the existing buried pipe 101 can be destroyed by correctly excavating the leading conductor 20 having a desired diameter along the planned line so as not to be shifted to the side road. Therefore, there is no technical difficulty to improve the ground in the state where the existing buried pipe 101 has a substantially uniform supporting force, and it is not necessary to use a filler for ground improvement. 101 can be replaced with the new buried pipe 104 at low cost.

  As a result, in this buried pipe replacement method, unlike the conventional technique, the existing buried pipe 101 is replaced with a new buried pipe having a desired diameter in a desired buried path regardless of the buried path and the diameter. In addition to being able to be replaced with 104, it can be replaced at low cost without any technical difficulties. The cutter apparatus 1 for buried pipe replacement of the first example used for carrying out the invention of this buried pipe replacement method is implemented by using the cutter 2 and the water blocking wall 5 provided thereon. For example, the existing buried pipe 101 can be replaced with the newly installed buried pipe 104, and this can be recovered when a malfunction occurs in the cutter device 1. In this case, the above-described effects are obtained. The technical problems described above can be achieved.

  In the cutter apparatus 1 for replacing the buried pipe of the first example, the expansion and contraction of the hydraulic jack 11 is transmitted to the cutter 2 through the link mechanism including the support members 4a and 4b, so that the cutter 2 is installed in the existing buried pipe. Since the hydraulic jack 11 is provided with a stroke sensor, the amount of biting of the cutter 2 into the existing buried pipe 101 can be adjusted while observing the stroke sensor. Can do. Therefore, by adjusting the amount of bite, the pretreatment for facilitating crushing of the existing buried pipe 101 is appropriately performed so as to match the material of the buried pipe 101 and the crushing ability of the cutter head 21 of the leading conductor 20. Can do.

  Further, in the cutter device 1 for replacing the buried pipe of the first example, since the chemical liquid supply pipe 10 is particularly attached to the water blocking wall 5, by supplying the chemical liquid from the chemical liquid supply pipe 10 as necessary, The chemical solution can be filled into the existing buried pipe 101 into which the cut 103 is made by the cutter 2 to prevent the existing buried pipe 101 from being crushed by the earth pressure of the natural ground. The existing buried pipe 101 can be fixed with a chemical solution so as not to be displaced from the natural ground by leaching from the notch 103 to the natural ground. Therefore, the existing buried pipe 101 that has been pre-processed by making the cut 103 with the cutter 2 can be smoothly crushed by the cutter head 21 of the leading conductor 20. As described above, the chemical solution uses the same material as the filler for ground improvement, as described above, but is limitedly used for preventing deformation of the existing buried pipe 101 and fixing it to the natural ground. However, since it is not used for ground improvement, there is no technical difficulty or cost increase.

  Furthermore, in the cutter apparatus 1 for replacing the buried pipe in the first example, when the water blocking wall 5 is advanced separately from the leading conductor 20 when the cutter 2 cuts into the existing buried pipe 101, the water blocking wall is pulled. Since the wire 8 is pulled and moved forward, the water blocking wall 5 can be moved forward by simple means, and the water blocking wall 5 can be moved forward with little risk of failure. Can do. Further, since a cutter driving device for driving the cutter 2 is not required, the structure is simple and can be manufactured at low cost, and the existing buried pipe 101 having a relatively low strength such as a vinyl chloride pipe or a ceramic pipe is a target. It is suitable as a buried pipe replacement device.

  Next, a buried pipe replacement cutter apparatus 1 according to a second example embodying the invention of the buried pipe replacement cutter apparatus of this application will be described with reference to FIGS. The cutter device 1 of the second example is an embodiment of the cutter device for exchanging buried pipe according to the invention of this application on the assumption that the cutter device 1 is mainly used when replacing an existing buried pipe 101 made of reinforced concrete. is there.

  FIG. 6 is a longitudinal sectional view of an essential part showing a state in which a buried pipe replacement method is carried out using the buried pipe replacement cutter device of the second example embodying the invention of this application, FIG. Is a cross-sectional view taken along the line C-C of FIG. 6, FIG. 8 is a longitudinal cross-sectional view of the main part showing the state when the buried pipe replacement cutter device of the second example in FIG. 6 is recovered, and FIG. It is the DD sectional view taken on the line of FIG. In these drawings, the portions denoted by the same reference numerals as those in FIGS. 1 to 5 described above represent the same portions as those in FIGS. 1 to 5 and will not be described in detail unless otherwise noted.

  The cutter apparatus 1 for replacing the buried pipe according to the second example is configured as a movable body that is configured to be separated and independent from the leading conductor 20 and can be moved forward in the existing buried pipe 101 separately from the leading conductor 20. The basic structure is the same as that of the first example in that the water blocking wall 5 and the cutter 2 attached to the water blocking wall 5 and capable of cutting the existing buried pipe 101 are provided. Absent. Further, as will be described later, the driving force of the hydraulic jack 11 is transmitted to the cutter 2 through the link mechanism, so that the cutter 2 can be projected and retracted in the radial direction of the existing buried pipe 101. The basic structure is the same as that of the first example.

  6 to 9, reference numeral 3 denotes a cutter driving device that rotationally drives the cutter 2, and 4 a denotes a cutter that pivotally attaches one end and the other end to the cutter receiving member 4 d and the rod 16 of the hydraulic jack 11, respectively. 2b is a tiltable link-like movable support member that supports 2 and an arm-shaped support member that supports the cutter 2 with one end pivotably attached to the connecting member 4e and the other end fixed to the water blocking wall 5. The fixed support member 4c is a connecting pin for pivotally mounting the movable support member 4a and the fixed support member 4b, 4d is a cutter receiving member for supporting the rotating shaft of the cutter 2, 4e is fixed to the cutter 2 at one end, and the other end is fixed at the other end. A connecting member that is pivotally attached to the fixed support member 4b and connects the two, 102a is a horizontal reinforcing bar (see FIGS. 6 and 8) embedded in the circumferential direction in the existing embedded pipe 101, and 102b is an existing embedded pipe. 101 in the axial direction Vertical stripe is a rebar embedded (see FIGS. 7 and 9) is.

  As in the first example, the cutter 2 in the second example is water-stopped via the support members 4a and 4b so that the notch 103 can be inserted into the existing buried pipe 101 at the rear portion of the seal 6. Although it is attached to the wall 5, it is different from that of the first example in that it has a disk shape and is rotated by the cutter driving device 3. Along with this, the link mechanism by the support members 4a, 4b and the like for enabling the cutter 2 to protrude and retract in the radial direction of the existing buried pipe 101 is also the one in the first example as will be described later. Slightly different. As shown in FIGS. 7 and 9, a plurality of such cutters 2 are installed radially on the outer peripheral side of the water blocking wall 5.

  Each cutter 2 is rotationally driven while sewing the gaps between a number of vertical bars 102b in the existing buried pipe 101, and by inserting slit-shaped cuts 103 into the buried pipe 101, the buried pipe 101 while cutting the horizontal stripes 102a. Is cut in the axial direction. As a result, the existing buried pipe 101 is divided at a predetermined interval in the circumferential direction and divided into a plurality of divided pieces. In the example shown here, the cutter 2 is configured so that a slit-like cut 103 can be inserted into the existing buried pipe 101 so that it can be completely cut. It may be configured so as to be inserted, and in short, the configuration may be such that the transverse stripe 102a of the embedded tube 101 can be cut and the cut 103 can be inserted into the embedded tube 101.

  A plurality of cutter driving devices 3 are provided corresponding to each cutter 2. As shown in FIG. 7, a plurality of protruding pieces 16a are radially provided at substantially the same interval at the tip of the rod 16 of the hydraulic jack 11, and a movable support member is provided corresponding to the plurality of protruding pieces 16a. A plurality of 4a are also provided, and similarly, a plurality of fixed support members 4b, cutter receiving members 4d, and connecting members 4e are also provided. Each movable support member 4a has a bifurcated cross section as shown in FIG. 7, and one end of the movable support member 4a is attached to the cutter receiving member 4d so as to sandwich the cutter receiving member 4d by the bifurcated cross section. The connecting pin 4c is pivotally attached, and the other end is pivotally attached to the protruding piece 16a by the connecting pin 4c. As shown in FIG. 7, a pair of cutter receiving members 4d are provided so as to sandwich both front and back surfaces of the cutter 2, and the cutter driving device 3 is attached to one of them. The rotating shaft of the cutter driving device 3 is fixed to the cutter 2 so that the rotation is transmitted, and is rotatably supported by a pair of cutter receiving members 4d.

  As shown in FIG. 8, when the hydraulic jack 11 is contracted and the other end portion is advanced, the movable support member 4a tilts so that one end portion faces rearward about the connecting pin 4c at the other end portion. Along with this, the cutter 2 rotates around the connecting pin 4c at one end of the fixed support member 4b and immerses in the radial direction of the existing buried pipe 101 to the inside of the inner peripheral surface of the buried pipe 101. Withdrawn. Further, as shown in FIG. 6, when the hydraulic jack 11 is extended and the other end portion of the movable support member 4a is retracted, the movable support member 4a has its one end portion facing up and down around the connecting pin 4c at the other end portion. That is, that is, the movable support member 4a is tilted so as to be in a nearly vertical state. Along with this, the cutter 2 rotates about the connecting pin 4c at one end of the fixed support member 4b and protrudes in the radial direction of the existing embedded pipe 101, so that the embedded pipe 101 can be cut. It shifts to the correct state.

  Thus, the cutter device 1 for replacing the buried pipe in the second example tilts the movable support member 4a in the same manner as in the first example by providing the link mechanism including the support members 4a and 4b. The cutter 2 can be made to appear and disappear.

  Since the cutter apparatus 1 for replacing the buried pipe according to the second example is configured as described above, the buried pipe replacement method according to the invention of this application should be carried out in the same manner as the first example. Can do. In that case, since the cutter 2 has a disk shape and is rotationally driven by the cutter driving device 3, if the incision 103 is made by the cutter 2 in the existing embedded pipe 101 in the second step, A large number of transverse stripes 102 a are cut by the cutter 2. Further, in the third step, the existing buried pipe 101 cut in the second step is crushed by the cutter head 21 of the leading conductor 20, and a number of vertical bars 102b of the buried pipe 101 are cut to obtain a pipe. An underground underground mine is formed. At that time, obstacles such as cut pieces of the horizontal stripes 102a and the vertical stripes 102b can be pushed away to the periphery of the underground mine by the cutter head 21 of the leading conductor 20, and only excavations with a small particle size are allowed. It is taken in the leading conductor 20 and discharged to the ground.

  Further, during the operation of replacing the existing buried pipe 101 in this way, when a malfunction such as damage occurs in the cutter apparatus 1 for replacing the buried pipe, the cutter 2 attached to the cutter apparatus 1 is remotely operated. After retracting to the inside of the inner peripheral surface of the buried pipe 101, the water blocking wall 5 is advanced separately from the leading conductor 20 to keep the newly buried buried pipe 104 and the leading conductor 20 in their current positions. The cutter device 1 for exchanging buried pipes can be collected independently on the reaching shaft side. Therefore, when a malfunction due to damage or the like occurs in the cutter device 1 for replacing the buried pipe, it can be easily and economically recovered unlike the conventional technique. For this reason, when the cutter 2 is worn, the cutter 2 can be easily replaced, and even if the existing buried pipe 101 is of high strength, the buried pipe can be replaced over a long distance section. It can be done smoothly.

  The method for replacing the buried pipe by the cutter apparatus 1 for replacing the buried pipe according to the second example has the same effect as the buried pipe replacing method according to the first example described above, and the existing buried pipe 101 is reinforced concrete. It can also be carried out when made. Further, since the cutter device 1 for replacing the buried pipe of the second example requires a cutter driving device, the structure is more complicated and expensive than that of the first example, but the strength of the buried pipe made of reinforced concrete is high. It can also be used when the existing buried pipe 101 is replaced. In other respects, the same effect as the cutter apparatus 1 for replacing the buried pipe of the first example described above can be obtained.

  In the first and second examples described above, the buried pipe replacement cutter device 1 is configured to move forward by pulling the water blocking wall 5 installed in the existing buried pipe 101 with the wires 8. However, you may comprise so that it can attach to the water stop wall 5 and the drive wheel rotationally driven by the drive device, and can be made to move forward. If comprised in this way, by adjusting the rotation speed of the drive wheel, according to peripheral conditions, such as the amount of the cutter 2 biting into the existing underground pipe 101 and the material of the underground pipe 101, the water blocking wall 5 Since the forward speed can be finely adjusted, pretreatment for easily crushing the existing buried pipe 101 can be efficiently and appropriately performed according to the surrounding conditions.

  Finally, a third embodiment of the buried pipe replacement cutter apparatus 1 embodying the invention of the buried pipe replacement cutter apparatus of this application will be described with reference to FIGS. The cutter device 1 of this third example is a buried pipe replacement cutter device according to the invention of this application so that a buried pipe replacement cutter device suitable for replacement of an existing buried pipe 101 made of reinforced concrete can be self-propelled. It is embodied and suitable for replacing the existing buried pipe 101 made of reinforced concrete.

  FIG. 10 is a longitudinal sectional view of an essential part showing a state in which a buried pipe replacement method is carried out using a buried pipe replacement cutter device of a third example embodying the invention of this application. Is a cross-sectional view taken along the line E-E of FIG. 10, FIG. 12 is a longitudinal cross-sectional view of the main part showing a state when the cutter device for replacing the buried pipe of the third example in FIG. It is the FF sectional view taken on the line of FIG. In these drawings, the portions denoted by the same reference numerals as those in FIGS. 1 to 9 described above represent the same portions as those in FIGS. 1 to 9 and will not be described in detail unless otherwise noted.

  The cutter apparatus 1 for replacing the buried pipe of the third example is configured as a movable body that is configured to be separated and independent from the leading conductor 20 and can be advanced separately from the leading conductor 20 in the existing buried pipe 101. The basic structure is the same as that of the first example in that the water blocking wall 5 and the cutter 2 attached to the water blocking wall 5 and capable of cutting the existing buried pipe 101 are provided. Absent. Further, as will be described later, the basic structure is the same as that of the first example in that the cutter 2 can be configured to appear and disappear in the radial direction of the existing embedded pipe 101.

  10 to 13, reference numeral 2 denotes a cutter that is rotationally driven by the cutter driving device 3 and can cut the peripheral wall of the existing buried pipe 101 spirally, and 5 is a water blocking wall for mounting the cutter 2, 5a is an outer peripheral portion of the water stop wall 5 and an outer peripheral portion of a ring-shaped water stop wall to which an annular seal 6 is attached. 5b is a substantially cross section disposed rotatably inside the water stop wall outer peripheral portion 5a. An H-shaped disc-shaped water blocking wall main body, 5c is a bearing that rotatably supports the water blocking wall main body 5b, and 12 is rotationally driven by a driving device (not shown) via the support arm 13a and the water blocking wall main body 5b. A driving wheel 13a that drives the cutter 2 to move forward while revolving, 13a is a support arm for rotatably mounting the driving wheel 12 and fixing it to the front surface of the water blocking wall body 5b, and 13b is this support arm. 13a is attached to the front surface of the water blocking wall body 5b. A fixing member for.

  A plurality of drive wheels 12 are attached to both front and rear surfaces of the support arm 13a. Although not shown, a pair of such drive wheels 12 and support arms 13a are provided symmetrically about the axis of the water blocking wall body 5b. When the driving wheel 12 is rotationally driven by a driving device such as a hydraulic motor, the driving wheel 12 rolls on the existing buried pipe 101 and advances while turning the support arm 13a, and accordingly, the water stop wall body 5b is rotated. While moving forward. As a result, the cutter 2 attached to the water blocking wall body 5b can be advanced while revolving. A drive device for rotationally driving the drive wheel 12 is installed at an appropriate location such as inside or outside the support arm 13a.

  14a is a movable support arm that supports the cutter 2 and the cutter drive device 3 by attaching the other end portion to the rear surface of the water blocking wall body 5b so that the cutter drive device 3 can be tilted. 14b is a hydraulic jack at one end portion. 11 is a fixed support arm that pivotally attaches an end portion on the tube side and fixes the other end portion to the water blocking wall body 5b, and 14c supports the hydraulic jack 11 in a fixed manner. A connecting pin for pivotally mounting on the arm 14b, 14d is a mounting member for tiltably mounting the movable support arm 14a to the rear surface of the water blocking wall body 5b, and 14e is fixedly supporting the tube side of the hydraulic jack 11 It is a bracket for pivotally attaching to one end of the arm 14b.

  The hydraulic jack 11 has an end on the tube side rotatably supported by the fixed support arm 14b, and an end on the rod side is attached to the movable support arm 14a as shown in FIG. In that case, it is pivotally mounted. Therefore, as shown in FIGS. 12 and 13, when the hydraulic jack 11 is contracted, the movable support arm 14a is tilted about the mounting member 14d side and pulled toward the fixed support arm 14b side, and accordingly, the cutter 2 is immersed in the radial direction of the existing buried pipe 101 and retracted inside the inner peripheral surface of the buried pipe 101.

  Further, as shown in FIGS. 10 and 11, when the hydraulic jack 11 is extended, the movable support arm 14a is tilted about the attachment member 14d side and pushed away from the fixed support arm 14b side. The cutter 2 protrudes in the radial direction of the existing buried pipe 101 and is displaced so as to be able to make a cut into the buried pipe 101. As described above, the buried pipe replacement cutter device 1 of the third example is configured so that the cutter 2 can be caused to appear and retract by extending and retracting the hydraulic jack 11 as in the first example and the second example. doing.

  Since the cutter apparatus 1 for replacing the buried pipe of the third example is configured as described above, the cutter 2 is driven in the radial direction of the existing buried pipe 101 by the extension of the hydraulic jack 11. When the cutter 2 is rotationally driven by the cutter driving device 3 while rotationally driving the wheel 12, the driving wheel 12 rolls on the existing buried pipe 101 and advances while rotating the support arm 13a. The water blocking wall 5 also advances while the water blocking wall main body 5b rotates relative to the ring-shaped water blocking wall outer peripheral portion 5a. Then, the cutter 2 that is rotationally driven by the cutter driving device 3 advances while revolving and cuts the peripheral wall of the existing buried pipe 101 in a spiral shape. As a result, the cutter 2 cuts not only the horizontal bars 102a but also the vertical bars 102b of the existing buried pipe 101 made of reinforced concrete.

  When an operation such as damage to the buried pipe replacement cutter device 1 occurs during the operation of replacing the existing buried pipe 101 in this way, the hydraulic jack 11 is shrunk by remote operation and the cutter 2 is moved to the existing buried pipe 101. Then, the drive wheel 12 is rotationally driven to advance the water blocking wall 5 separately from the leading conductor 20, so that the new buried pipe 104 and the leading conductor 20 remain in place while being buried. The pipe replacement cutter device 1 can be collected independently on the reaching shaft side. Therefore, when a malfunction due to damage or the like occurs in the cutter device 1 for replacing the buried pipe, it can be easily and economically recovered unlike the conventional technique. For this reason, when the cutter 2 is worn, the cutter 2 can be easily replaced. Even if the existing buried pipe 101 is made of reinforced concrete, the buried pipe can be replaced smoothly over a long distance section. It can be carried out.

  By the way, if a method of cutting only the horizontal stripe 102a of the existing buried pipe 101 with the cutter 2 and cutting the vertical stripe 102b with the cutter head 21 of the leading conductor 20 is adopted, the vertical stripe 102b becomes the cutter head of the leading conductor 20 at the time of cutting. Therefore, it is desirable to take measures separately. On the other hand, in the cutter device 1 of the third example, both the horizontal streak 102a and the vertical streak 102b of the buried pipe 101 can be cut by the cutter 2, so that the vertical streak 102b is formed on the cutter head 21 of the leading conductor 20. Further, it is possible to prevent the entangled tube 101 from being entangled, and further, the existing embedded pipe 101 which has been pretreated by cutting with the cutter 2 can be more reliably crushed by the cutter head 21 of the leading conductor 20.

  The cutter device 1 for replacing the buried pipe of the third example is provided with a driving wheel 12 that is rotationally driven by a driving device on the water blocking wall main body 5b of the water blocking wall 5, and moves forward by self-running. Therefore, by adjusting the rotation speed of the drive wheel 12, the cutter 2 can be inserted into the existing buried pipe 101 according to the surrounding conditions such as the amount of biting of the cutter 2 and the material of the buried pipe 101. The revolution speed and forward speed of 2 can be finely adjusted. Therefore, the pretreatment for easily crushing the existing buried pipe 101 can be efficiently and appropriately performed according to the surrounding conditions.

  The cutter apparatus 1 for exchanging buried pipes according to the third example and the buried pipe exchanging method performed using the cutter apparatus 1 are more complicated in structure than the cutter apparatus 1 in the first example. Although it requires a corresponding amount of cost, it is an excellent technique that makes the reinforced concrete buried pipe 101 symmetrical, and in other respects, replacement of the buried pipe replacement cutter device 1 and buried pipe described in the first example. The same effect as the method is achieved. In the example described above, the moving body is particularly the water blocking wall 5 in order to form a chamber for generating earth pressure with the leading conductor 20 to prevent collapse of the natural ground and infiltration of groundwater. In the case where the buried area of the existing buried pipe 101 is a solid ground that does not cause the collapse of natural ground or the ingress of groundwater, the moving body does not necessarily need to be the water blocking wall 5, and the existing buried pipe What is necessary is just to be able to advance the inside of 101 separately from the leading conductor 20.

It is a longitudinal cross-sectional view which shows the state which is implementing the replacement | exchange method of a buried pipe using the cutter apparatus for buried pipe replacement of the 1st example which actualized invention of this application. It is an enlarged view of the cutter apparatus vicinity for buried pipe replacement of FIG. It is the sectional view on the AA line of FIG. It is a figure similar to FIG. 2 which shows the state when collect | recovering the cutter apparatuses for buried pipe replacement. It is the BB sectional view taken on the line of FIG. It is a longitudinal cross-sectional view of the principal part which shows the state which is implementing the replacement | exchange method of a buried pipe using the cutter apparatus for buried pipe replacement of the 2nd example which actualized invention of this application. It is CC sectional view taken on the line of FIG. It is a longitudinal cross-sectional view of the principal part which shows a state when collect | recovering the cutter apparatuses for buried pipe replacement of the 2nd example in FIG. It is the DD sectional view taken on the line of FIG. It is a longitudinal cross-sectional view of the principal part which shows the state which is implementing the replacement | exchange method of a buried pipe using the cutter apparatus for buried pipe replacement of the 3rd example which actualized invention of this application. It is the EE sectional view taken on the line of FIG. It is a longitudinal cross-sectional view of the principal part which shows a state when collect | recovering the cutter apparatuses for buried pipe replacement of the 3rd example in FIG. It is the FF sectional view taken on the line of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cutter apparatus for buried pipe replacement 2 Cutter 3 Cutter drive apparatus 4a Movable support member 4c (of cutter 2) Fixed support member 4c Connection pin 4d Cutter receiving member 4e Connection member 5 Water blocking wall 5a Water blocking wall Outer peripheral part 5b Water blocking wall body 5c Bearing 6 Seal 7 Wire mounting bracket 8 Water blocking wall pulling wire 9 Chemical liquid inlet 10 Chemical liquid supply pipe 11 Hydraulic jack 12 Drive wheel 13a (Drive wheel 12) support Arm 13b Fixed member 14a Movable support arm 14b Fixed support arm 14c Connection pin 14d Mounting member 14e (of the movable support arm 14a) Bracket 15 Connection member 20 Lead conductor 21 Cutter head 22 Cutter bit 23 Reaction force transmission plate 24 Sediment intake port 31 Drainage pipe 101 Existing buried pipe 102a Transverse 1 02b Longitudinal line 103 Incision 104 New buried pipe

Claims (2)

A pipe propulsion unit that has a front conductor with a cutter head at the front and a buried pipe connected to the rear, and digs a natural ground with the cutter head while propelling the front conductor and the buried pipe. A movable body that can be moved forward in a buried pipe replacement method in which an existing buried pipe is destroyed by a cutter head of a leading conductor and the buried pipe is replaced by replacing the buried pipe using a machine. And a cutter that can be cut into an existing buried pipe that is attached to the movable body, and is installed with a cutter while moving the movable body in the cutter device for replacing the buried pipe separately from the leading conductor. After the incision is made in the buried pipe, the leading conductor is propelled, and the buried pipe with the notch is crushed by the cutter head of the leading conductor to form an underground mine for burying the pipe. The process of pushing the pipe together with the leading conductor into the underground mine allows the buried pipe to be replaced, and if a malfunction occurs in the cutter apparatus for replacing the buried pipe during this time, the cutter attached to this cutter apparatus is installed by remote control. Replacing the buried pipe characterized in that, after being retracted inside the inner peripheral surface of the buried pipe, the movable body is moved forward separately from the leading conductor to recover the cutter device for replacing the buried pipe. Method. A pipe propulsion unit that has a front conductor with a cutter head at the front and a buried pipe connected to the rear, and digs a natural ground with the cutter head while propelling the front conductor and the buried pipe. A cutter device for replacing a buried pipe that is installed in front of the machine and used to replace a buried pipe by burying a new buried pipe while destroying an existing buried pipe with a cutter head of a leading conductor. A movable body configured separately from the body and capable of moving forward in the existing buried pipe separately from the leading conductor, and a cutter attached to the movable body and capable of cutting the existing buried pipe A cutter device for exchanging buried pipes, characterized in that the cutter can be projected and lowered in the radial direction of an existing buried pipe.

Images