JP2018009420A - Device and method for installing propulsion pipe, and method for renewing existing pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device and a method for installing a propulsion pipe that enables the propulsion pipe to be installed by stably and efficiently crushing an existing pipe and excavating a ground around the existing pipe, and a crushed object and excavated soil to be discharged efficiently.SOLUTION: A propulsion pipe installation device includes a leading body (30) and a propulsion device (50) that propels the leading body (30) and a propulsion pipe (4) from behind. The leading body (30) includes a cylindrical barrel part (31), excavation planar disc parts (41, 41a, 41b, 41c, 41d) disposed at a tip of the barrel part (31), and an air hammer device (34) installed inside the barrel part (31). The excavation planar disc parts (41, 41a, 41b, 41c, 41d) are provided with a hammer head part (33) of the air hammer device (34), and at least one of intake opening parts (42, 42a, 42b, 42c, 42d) apart from the hammer head part (33).SELECTED DRAWING: Figure 3

Description

  The present invention relates to a propulsion pipe laying device, a propulsion pipe laying method, and a propulsion pipe laying method for crushing an existing pipe buried in the ground and excavating ground around the existing pipe to propel the propulsion pipe. The present invention relates to an existing pipe updating method in which an existing pipe is updated to a main pipe by inserting the main pipe into the sheath pipe and laying it.

  Since buried pipes (existing pipes) buried in the ground as lifelines such as water and sewage and gas are subject to cracking and breakage due to aging and aging, buried pipes that exceed the service life are new. Replaced with a pipe (new pipe) and updated. In some cases, it may be necessary to update damaged pipes to new pipes for the sake of earthquake recovery.

  As a method for renewing existing pipes, there is a case in which a renovation promotion method is used in which new pipes are pushed while breaking existing pipes without excavating existing pipes from the ground surface. In this remodeling propulsion method, a propulsion pipe laying device having a leading conductor having a cutter head at a tip portion and a propulsion device having a propelling means such as a hydraulic jack for imparting a propelling force to the leading conductor is used. Regarding a leading conductor having a cutter head used in such a reconstruction propulsion method, and a propelling pipe laying device provided with the leading conductor, JP 2010-133145 A (Patent Document 1) and JP 2014-109103 A It is disclosed in the gazette (patent document 2) etc.

  In general, a propelling pipe laying device equipped with a leading conductor having a cutter head crushes an existing pipe little by little by the leading conductor's cutter head by propelling the leading conductor into the ground with the propelling device while rotating the cutter head. . Further, by pushing a new propulsion pipe behind the leading conductor by the propulsion device, the propulsion pipe is embedded in a space formed by crushing and excavating the cutter head.

  Moreover, when crushing an existing pipe with the cutter head of the leading conductor, the crushed material of the existing pipe crushed by the cutter head, and excavated soil (excavation) generated by excavating the surrounding ground of the existing pipe with the cutter head, It is taken into the front conductor from the opening provided at the tip of the front conductor, and further discharged by being sent backward by a helical screw disposed in the front conductor or the propelling pipe.

  On the other hand, as a means for crushing existing pipes and excavating the ground in the renovation promotion method, there is known a technique that gives a hitting vibration to a drill bit using a down-the-hole hammer method instead of a cutter head of a leading conductor as described above. ing. In this down-the-hole hammer method, compressed air is supplied from the compressor to the air hammer device, and the hammer piston of the air hammer device is reciprocated by the compressed air, and the drill bit is hit. Crushing and ground excavation are performed. For example, Japanese Patent Laid-Open No. 10-259692 (Patent Document 3) discloses a ground cutting device including an air hammer device that uses such a down-the-hole hammer method and a drill bit (also referred to as a hammer head). Yes.

  The grinding device described in Patent Document 3 includes a base that is provided with two rotating means and that can be moved back and forth on the propulsion base, and a buried pipe that is rotatably connected by one rotating means of the base, It has a soil auger, an air hammer device, and a drill bit (hammer head) that are built in the buried pipe and are driven to rotate by the other rotating means of the base.

  Patent Document 3 describes that the ground is ground and ground by the impact force of the excavation bit by transmitting the impact force of the air hammer device to the excavation bit. In addition, the excavation bit to which the impact force is transmitted has a drainage hole, and the excavation soil excavated by the impact force of the excavation bit is introduced into the buried pipe through the excavation bit's drainage hole, and then into the buried pipe. It describes that it is discharged to the outside from the buried pipe at the rear end by being transferred rearward by a provided earth auger.

JP 2010-133145 A JP 2014-109103 A Japanese Patent Laid-Open No. 10-259692

  Currently, various types of pipes such as ceramic pipes, fume pipes (reinforced concrete pipes), and vinyl chloride pipes are used for underground pipes buried in the ground. Further, when the buried pipes are joined together, a metal collar may be used for the joint portion.

  For this reason, for example, in the reconstruction propulsion method, when the buried pipe is crushed and renewed into a propelled pipe using the above-mentioned leading conductor cutter head, the buried pipe is a fume pipe, When a metal collar is used for the joint part of this, and when the ground around the buried pipe is extremely hard, it takes time to crush or dig with the cutter head, and the propulsion speed may be slow. . In addition, when crushing or excavating with only the cutter head, the cutter head is likely to be worn or damaged, so it is necessary to replace the cutter head more frequently or to use an expensive carbide cutter head. As a result, the cost may increase.

  Furthermore, when fume pipes are crushed with a cutter head, the cut reinforcing bars may get entangled with the cutter head or the screw that transports the excavated soil. In this case, the reconstruction promotion work is suspended to remove the entangled material. There is also a problem of reducing work efficiency.

  On the other hand, in the reconstruction promotion method, for example, as in Patent Document 3, when the buried pipe is crushed with a hammer head (excavation bit) using the down-the-hole hammer method, compared to the case of using the cutter head as described above, The fume tube and the like can be easily broken in a short time, and problems such as rebar entanglement do not occur.

  However, when crushing buried pipes with a hammer head or excavating the ground, it is usually provided so that a large hammer head is exposed on the entire tip surface of the tip conductor. In order to give an impact force), it is necessary to install a large air hammer device inside the leading conductor. In addition, when installing a large air hammer device, it is necessary to increase the size of ground equipment such as an air compressor that sends air to the air hammer device. For this reason, the construction cost is increased, and the noise due to the air hammer device and the ground equipment is increased, and there are cases where the installation area of the ground equipment cannot be secured depending on the location.

  In general, in the down-the-hole hammer method, crushed material crushed by the hammer head and excavated excavated soil are placed behind the hammer head through a narrow groove formed from the surface of the hammer head to the outer peripheral edge of the hammer head. Sent. For this reason, it is difficult to secure a large flow path for sending crushed material and excavated soil from the hammerhead into the leading conductor, and it has been difficult to efficiently incorporate the crushed material and excavated soil into the leading conductor.

  In addition, as a means for discharging the crushed material and excavated soil, for example, as in Patent Literature 3, a hammer discharge hole for sending the crushed material and excavated soil into the leading conductor may be formed in the hammer head itself. Since it is difficult to form a large soil removal hole in order to ensure the strength of the hammerhead appropriately, it is difficult to efficiently take crushed material and excavated soil into the tip conductor as in the above case.

  Furthermore, when a large air hammer device is installed in the leading conductor as described above, the air hammer device occupies a large space in the leading conductor, so crushed material and excavated soil taken into the leading conductor from the hammer head are removed. The size (diameter) of the flow path for transporting backward is also limited. Therefore, when the down-the-hole hammer method is used in the reconstruction promotion method, there is a problem that crushed material crushed by the hammer head and excavated excavated soil cannot be efficiently discharged.

  In addition, when the existing pipe made of a soft material such as a vinyl chloride pipe is crushed using a hammer head of the down-the-hole hammer method, the existing pipe is broken finely without being crushed finely. May not be discharged. Further, the soft existing pipe is bent by the hammer head, which may affect the direction control of the leading conductor.

  The present invention has been made in view of the above-described conventional problems, and its specific purpose is to crush existing pipes and excavate the surrounding ground of existing pipes regardless of the type of the existing pipe and the hardness of the ground. A propulsion pipe laying device capable of carrying out propulsion laying of the propulsion pipe stably and efficiently, and capable of efficiently transporting and discharging crushed crushed material and excavated excavated soil to the rear; and It is another object of the present invention to provide a propulsion pipe laying method and to provide an existing pipe update method for updating an existing pipe by attaching a new pipe using the propulsion pipe laid by the propulsion pipe laying method.

  In order to achieve the above object, the propulsion pipe laying device provided by the present invention is a propulsion unit that crushes an existing pipe buried in the ground and excavates the ground around the existing pipe to propel the propulsion pipe. A pipe laying device, which is arranged in advance of the propulsion pipe and which crushes the existing pipe and excavates the surrounding ground; and a propulsion apparatus which propels the tip conductor and the propulsion pipe from behind In the propulsion pipe laying device, the leading conductor has a cylindrical body part, a drilling face plate part disposed at a tip of the body part, and an air hammer device installed in the body part, The excavation face plate portion is provided with a hammer head portion for crushing the existing pipe and excavating the surrounding ground by impact vibration transmitted from the air hammer device, and the existing excavation surface plate portion is separated from the existing hammer head portion. Tube crushed material The excavated soil is to the most important feature takes in that at least one take-opening for discharging is arranged in the body part.

In such a propulsion pipe laying device of the present invention, the hammer head portion exceeds the outer surface diameter of the excavation surface including the axial center position of the trunk portion and the outer diameter of the trunk portion in front view of the leading conductor. It is preferable that the region is arranged in a continuous substantially rectangular or oval shaped region including a projecting region projecting outward.
In addition, it is preferable that the two intake openings are arranged in symmetrical shapes on the left and right sides in the rotation direction of the leading conductor in the hammer head portion.

Furthermore, in the present invention, in the front view of the leading conductor, the total opening area of the intake opening is set to 1% or more and 15% or less of the entire area of the excavation face plate part. preferable.
Further, it is preferable that a front cutter portion formed by melting and fixing a cutting tip on the excavated face plate portion and having irregular irregularities on the surface is provided. Furthermore, in this case, it is preferable that the front cutter portion is continuously extended radially from the central portion of the excavation face plate portion toward the outer peripheral edge portion of the excavation face plate portion.

  Furthermore, the leading conductor of the present invention is provided with an outer peripheral cutter bit portion formed continuously in a bent shape from the outer peripheral edge portion of the excavated face plate portion to the outer peripheral side surface of the body portion. Good.

  Next, according to the propulsion pipe laying method provided by the present invention, the existing pipe buried in the ground is crushed between the start pit and the reaching pit dug in the ground surface and the periphery of the existing pipe A propulsion pipe laying method for excavating the ground and propelling the propulsion pipe, wherein the propulsion pipe laying device of the present invention having the above-described configuration is carried in and installed in the start shaft, and the existing pipe is filled The filler is filled by the hammer head portion of the leading conductor by filling the material and advancing the leading conductor of the propulsion pipe laying device from the starting shaft toward the reaching shaft. Crushing the existing pipe and excavating the surrounding ground of the existing pipe; and crushing the ground pipe and excavated soil of the existing pipe through the intake opening of the front conductor. Get into the body In is to the most important feature that it comprises a to discharge.

  Further, the propulsion pipe laying method of the present invention is configured to send water from the ground surface through the water supply hose into the leading conductor, and to pass the water through the propulsion pipe laid from the leading conductor to the rear of the leading conductor. It is preferable to include discharging the crushed material and the excavated soil taken into the body portion from the intake opening by flowing toward the shaft.

  Next, the existing pipe updating method provided by the present invention uses the propulsion pipe laid by the above-described propulsion pipe laying method of the present invention as a sheath pipe, and inserts the main pipe into the sheath pipe and lays it. The most important feature is that the existing pipe is updated to the main pipe.

  The existing pipe renewal method of the present invention includes a plurality of spacer bands capable of supporting the main pipe at a predetermined position with respect to the sheath pipe before the main pipe is inserted. By attaching to the surface at a predetermined interval in the length direction of the main pipe, inserting the main pipe with the spacer band attached into the sheath pipe, and supporting the main pipe with a plurality of the spacer bands. Laying the main pipe with a predetermined gradient in the sheath pipe, and filling the space between the sheath pipe and the main pipe with a filling material to fix the position of the main pipe with respect to the sheath pipe It is preferable to include.

  The propulsion pipe laying device according to the present invention includes a leading conductor disposed in advance of the propelling pipe and a propulsion device that propels the leading conductor. The leading conductor has a cylindrical body part, a drilling surface board part arranged at the tip of the body part, and an air hammer device installed inside the body part. In addition, a hammer head portion that simultaneously crushes the existing pipe and excavates the ground is disposed on a part of the excavation face plate portion of the leading conductor. Furthermore, at least one intake opening for taking in the crushed material of the existing pipe and the excavated soil into the trunk portion of the tip conductor is disposed in a portion different from the hammer head portion of the excavated face plate portion.

  According to such a propulsion pipe laying device of the present invention, the existing pipe is crushed using the down-the-hole hammer type hammer head, and therefore, crushing and excavation are performed regardless of the type of existing pipe and the hardness of the ground. It can be performed easily, and the time required for crushing can be shortened as compared with the case of using a cutter head, for example. Further, when the fume tube is crushed, there is no problem that the reinforcing bars are entangled.

  In addition, the excavation face plate portion of the leading conductor of the present invention is provided with an intake opening portion separately from the hammer head portion. By providing the intake opening in a portion different from the hammer head portion in this way, it is possible to easily provide a large intake opening in the excavation face plate portion of the leading conductor without worrying about the strength of the hammer head portion. Therefore, the crushed material and the excavated excavated soil crushed by the hammer head portion can be efficiently taken into the trunk portion of the leading conductor through the intake opening and stably discharged.

  In such a propulsion pipe laying device of the present invention, the hammer head portion extends outward beyond the excavation surface center region including the axial center position of the trunk portion and the outer diameter of the trunk portion in the front view of the leading conductor. It is arranged in a continuous substantially rectangular or oval shaped region including the protruding region to be taken out. The hammer head is provided only in a part of the excavation face plate by propelling the tip conductor provided with the hammer head in the area of the excavation face plate with the propulsion device rotating the lead conductor. Even if it is not done, the existing pipe can be crushed and the ground excavated smoothly and stably so as to form a cylindrical space.

  In the present invention, two intake openings are symmetrically arranged on both the left and right sides of the hammer head in the rotation direction of the leading conductor. As a result, when propelling the propeller while propelling it with the propulsion device, the tip provided on the excavation faceplate part can be rotated in either the clockwise or counterclockwise direction when viewed from the front. The crushed material and excavated soil can be stably taken into the trunk portion of the leading conductor through the insertion opening.

  Furthermore, in the present invention, in the front view of the leading conductor, the total opening area of all the intake openings provided in the excavation face plate portion is 1% or more and 15% or less of the entire area of the excavation face plate portion, Preferably, it is set to 3% or more and 13% or less, more preferably 6% or more and 10% or less. By setting the total opening area of the intake opening to 1% or more of the entire area of the excavation face plate part, it is possible to smoothly take in crushed material and excavated soil from the intake opening. In addition, since the total opening area of the intake opening is set to 15% or less of the entire area of the excavated surface board, the strength of the excavated surface board can be secured stably.

  Further, the excavation face plate portion of the leading conductor in the present invention is provided with a front cutter portion which is formed by melting and fixing a cutting tip and having irregular irregularities on the surface. In particular, in this case, the front cutter part is continuously extended radially from the central part of the excavation face board part toward the outer peripheral edge part of the excavation face board part. As described above, the front cutter part is provided continuously with the excavation face plate part separately from the hammer head part, so that the existing pipe can be crushed and the ground excavated more efficiently.

  Further, the leading conductor in the present invention is provided with an outer peripheral cutter bit portion formed continuously in a bent shape from the outer peripheral edge portion of the excavated face plate portion to the outer peripheral side surface of the trunk portion. Accordingly, the leading conductor can be more smoothly propelled by the propulsion device while excavating the existing surrounding ground more effectively.

  Next, in the propulsion pipe laying method according to the present invention, first, the propulsion pipe laying apparatus of the present invention having the above-described configuration is carried in and installed in the start shaft dug in the ground surface, and the existing pipe is installed. Fill and solidify the filler. In this case, either the installation of the propulsion pipe laying device or the filling of the filler may be performed first, and the order is not limited.

  After the filler is solidified, the leading conductor is advanced along the existing pipe while being rotated from the starting shaft to the reaching shaft by the propulsion device of the propulsion tube laying device. As a result, the hammer head part of the leading conductor can crush the existing pipe filled with the filler and excavate the surrounding ground of the existing pipe regardless of the type of the existing pipe and the hardness of the ground. A propulsion pipe can be propelled and laid in a cylindrical space formed by excavation. In particular, in this case, for example, even if the existing pipe is made of a soft material such as a vinyl chloride pipe, the existing pipe is filled with a filler and solidified, so that the existing pipe can be finely and stably crushed, The existing pipe can be prevented from being bent by the hammer head, and the leading conductor can be stably advanced along the existing pipe. Further, according to the present invention, the crushed material of the existing pipe and the excavated soil can be efficiently taken into the trunk portion of the leading conductor through the intake opening provided in the excavated face plate portion and discharged stably.

  In such a propulsion pipe laying method of the present invention, when the existing pipe is propelled while rotating to crush the existing pipe and excavate the ground, water is sent from the ground surface into the front conductor via the water supply hose, Is caused to flow from the leading conductor toward the rear start shaft. As a result, the crushed material and excavated soil taken into the trunk portion of the leading conductor through the intake opening provided in the excavated face plate portion are transported from the leading conductor toward the rear start shaft and easily discharged. be able to.

  Next, in the existing pipe updating method provided by the present invention, the propulsion pipe laid by the above-described propulsion pipe laying method of the present invention is used as a sheath pipe, and the main pipe is inserted and laid in the sheath pipe. Thereby, the main pipe can be stably laid and the existing pipe can be renewed smoothly.

  In this case, before inserting the main pipe, a plurality of spacer bands adjusted so that the main pipe can be supported at a predetermined position with respect to the sheath pipe are arranged at predetermined intervals on the outer peripheral surface of the main pipe. Attach and insert main pipe with spacer band attached into sheath pipe. As a result, the main pipe inserted into the sheath pipe is supported at a predetermined position with respect to the sheath pipe by the plurality of spacer bands, so that the main pipe can be stably laid with a predetermined gradient in the sheath pipe. it can. After that, the space between the sheath tube and the main tube is filled with a filling material to fix the position of the main tube relative to the sheath tube. By performing the steps as described above, the main pipe can be stably buried in the ground so as to have a predetermined gradient in a predetermined direction, instead of the existing pipe embedded in the ground.

It is a schematic diagram which shows typically the apparatus and installation which are used by embodiment. It is a fragmentary sectional view showing the inside of a tip conductor typically. It is a front view which shows a tip conductor typically. It is a side view which shows a propulsion device typically. It is a flowchart which shows the process at the time of updating an existing pipe. It is a schematic diagram which illustrates typically the installation process of a propulsion apparatus. It is a schematic diagram which illustrates typically the filling process of a filler. It is a schematic diagram which illustrates typically the installation process of a preconductor. It is a schematic diagram explaining a crushing excavation promotion process typically. It is a schematic diagram which illustrates typically the removal process of a front conductor. It is a schematic diagram which illustrates typically the cleaning process of a crushed material and excavated soil. It is a schematic diagram explaining typically a main pipe insertion process. It is a schematic diagram which illustrates typically the filling process of a filling material. It is a longitudinal cross-sectional view which shows a main pipe. It is a cross-sectional view showing a propulsion pipe, a main pipe, and a spacer band. It is a front view showing the 1st modification of a tip conductor. It is a front view showing the 2nd modification of a tip conductor. It is a front view showing the 3rd modification of a tip conductor. It is a front view showing the 4th modification of a tip conductor.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described in detail with reference to the drawings. The present invention is not limited to the embodiments described below, and various modifications can be made as long as it has substantially the same configuration as the present invention and has the same effects. Is possible.

  For example, in the following embodiment, a case where a steel pipe is used as the propulsion pipe and a hard vinyl chloride pipe is used as the main pipe will be described. It is not limited.

  In this embodiment, a hard vinyl chloride pipe is embedded as an existing sewer pipe, and the sewer pipe (existing pipe) is crushed and a new hard vinyl chloride pipe is newly buried as a main pipe. The case where a sewer pipe is renewed is explained.

  When renewing the sewer pipe, first, the start shaft 1 and the reaching shaft 2 as shown in FIG. 6 and the like are excavated from the ground surface so as to sandwich the section (update section) where the renewal work is performed. In this case, a part of the sewer pipe (existing pipe 3) appearing in the starting shaft 1 and the reaching shaft 2 to be excavated is destroyed and removed, and further, a detour hose (not shown) is used to connect the upstream side and the downstream side of the renewal section. Connected, and using a pump or the like, the wastewater flowing from the upstream side of the renewal section is diverted to the ground surface via a bypass hose and sent to the downstream side. In addition, when there is a shaft already excavated, it is possible to use the shaft as the start shaft 1 or the reaching shaft 2.

  When the sewer pipe is renewed, various facilities are installed around the starting shaft 1 and the reaching shaft 2. For example, as shown in FIG. 1, a truck 11 with a crane that is used when a device or the like is carried into the start shaft 1, a dump truck 12 that transports earth and sand discharged by excavation, and the like are prepared. Also, a hydraulic unit 13 that generates hydraulic pressure and supplies the propulsion device 50, a generator 14 that supplies electric power to the propulsion device 50, a lubricant plant 15 that supplies lubricant, and a line that supplies oil to an air hammer device 34 described later. The starter shaft 1 includes an oiler 16, a compressor 17 that supplies high-pressure air to the air hammer device 34, and a water supply pump 19 that supplies water to the leading conductor 30 via a water supply hose 18 to discharge crushed materials and the like. It is installed around.

  In this case, in this embodiment, since a small air hammer device 34 is installed in the leading conductor 30 as will be described later, the line oiler 16 and the compressor 17 that supply oil and compressed air to the air hammer device 34 are downsized. In addition, the installation area of the facility can be made compact, and the generated noise can be suppressed more than before.

  In the present embodiment, in addition to the above-described equipment, a mixer 21 for mixing a filler such as mortar (see FIG. 7 and the like) and a grout pump 22 for injecting the mixed filler (see FIG. 7 and the like). Are installed around the start shaft 1. Further, in the start shaft 1 of the present embodiment, a laser transit 23 that measures the position of the leading conductor 30 by irradiating a target 32 (described later) of the leading conductor 30 and a crushed material that is flowed from the leading conductor 30 with water. And a pot hall (not shown) for temporarily storing excavated soil.

In this embodiment, the propulsion pipe laying device used for the crushing and excavating step includes a leading conductor 30 that crushes and excavates and a propulsion device 50 that propels the leading conductor 30.
As shown in FIGS. 2 and 3, the leading conductor 30 of the present embodiment includes a cylindrical body portion 31 and a drilling face plate portion 41 disposed at the tip of the body portion 31. Further, in the body portion 31 of the leading conductor 30, a hammer head portion 33 whose tip surface is exposed to the excavation face plate portion 41, an air hammer device 34 that applies hammering vibration (impact force) to the hammer head portion 33, and the body Two support fixing portions 35 that support and fix the air hammer device 34 to the portion 31, a stopper portion 36 that prevents the air hammer device 34 from falling backward, and the compressed air (high pressure air) from the compressor 17 to the air hammer device 34, an air hose 37 to be introduced into the water supply hose 18, a guide hose 38 that is connected to the water supply hose 18 and guides the water for discharge into the body portion 31, a hose fixing portion 39 that fixes the guide hose 38, and the position of the leading conductor 30 A target 32 to be irradiated with a laser for measuring the direction is arranged.

  The excavated face plate portion 41 of the leading conductor 30 is provided with the tip of the hammer head portion 33 exposed. Further, the excavation face plate portion 41 has two intake openings 42 arranged on both sides of the hammer head portion 33, and a plurality of radial openings arranged from the central portion of the excavation face plate portion 41 toward the outer peripheral edge portion. The front cutter part 43 is formed. Furthermore, an outer peripheral cutter bit portion 44 that is continuously formed in a bent shape over the outer peripheral side surface of the body portion 31 is provided at the outer peripheral edge portion of the excavated face plate portion 41.

  In the tip conductor 30 of this embodiment, the tip of the hammer head portion 33 has a flat tip surface exposed forward and a plurality of hemispherical hammer bids 33a projecting from the tip surface. . In this case, the hammer bid 33 a has a first hammer bid having a large size and a second hammer bid having a small size, and the first hammer bid is arranged along the outer periphery of the front end surface of the hammer head portion 33. The second hammer bid is arranged in a region inside the first hammer bid. In the present invention, the arrangement and size of the hammer bid are not particularly limited, and can be arbitrarily changed.

  The front end surface of the hammer head portion 33 of the present embodiment is disposed in a part of the excavation face plate portion 41 of the leading conductor 30 in the front view of the leading conductor 30 (FIG. 3), and has a substantially arc-shaped upper side and lower side. And a substantially oval shape (or a substantially rectangular shape) having straight left and right sides arranged parallel to each other.

  In this case, the substantially oval-shaped tip surface of the hammer head portion 33 includes an excavation surface including an axial center position (axial center position of the body portion 31) in rotation of the leading conductor 30 with respect to the entire leading end surface of the leading conductor 30. It is formed so as to include a center region (rotation center region) and a protruding region that protrudes outward beyond the outer diameter of the body portion 31. Thereby, when the leading conductor 30 moves forward while rotating and performs crushing excavation work, the hammer head portion 33 (the front end surface of the substantially oval shape) is more than the region where the body portion 31 of the leading conductor 30 is inserted. A wide circular area can be crushed and excavated.

  In this case, in front view of the leading conductor 30, the front end surface of the hammer head portion 33 performs leading crushing and excavation work efficiently and leads the crushing material and excavated soil generated efficiently. It is preferable to arrange with an area of 15% or more and 40% or less, particularly 20% or more and 30% or less with respect to the area of the entire front end surface of the body 30.

  An air hammer device 34 that applies a hammering vibration to the hammer head portion 33 is not shown, provided in the air hammer device 34 by the supply of compressed air from the compressor 17, in the same manner as a general air hammer device conventionally used. Although it has a structure in which the hammer piston of the cylinder is reciprocated and the hammer head 33 is hit by the reciprocation of the hammer piston to apply an impact force, it is formed in a relatively small size.

  By installing such a small air hammer device 34, it is possible to provide a space in the body portion 31 of the leading conductor 30, and thereby from the intake opening 42 of the excavation face plate portion 41. Using the water flowing out from the guide hose 38, the crushed material and excavated soil taken into the body portion 31 of the leading conductor 30 can be smoothly and efficiently conveyed and discharged rearward. .

  The left and right intake openings 42 are formed so as to penetrate the excavated face plate 41 from the front to the rear. The two intake openings 42 have a symmetric shape so that the hammer head 33 is sandwiched between the leading conductors 30 when viewed from the front of the leading conductor 30, and the excavated face plate 41 is clockwise in FIG. 3. The crushed material and excavated soil crushed and excavated by the hammer head portion 33 and the like into the body portion 31 of the leading conductor 30 through the intake opening 42, even if rotated counterclockwise or counterclockwise. It can be taken in efficiently.

  Each of the left and right intake openings 42 extends from the head-side straight portion disposed in parallel to the left-right side piece of the hammer head portion 33 and one end of the head-side straight portion, and extends along the cylindrical outer periphery of the body portion 31. It is formed in the shape like a petal which has the circular arc part arranged like this.

  In this case, the total opening area of the two intake openings 42 in the front view of the leading conductor 30 is determined in consideration of efficient intake of crushed material and excavated soil and the strength of the excavated face plate 41. The ratio is set to be 1% to 15%, preferably 3% to 13%, and more preferably 6% to 10% of the entire area of the portion 41. For example, in the case of the present embodiment, the total opening area of the two intake openings 42 is set to be about 9% of the entire area of the excavation face plate part 41.

  Further, in the leading conductor 30 of the present embodiment, as a means for crushing the existing pipe 3 and excavating the ground, in addition to the hammer head portion 33, as described above, a plurality of front cutter portions 43 and a plurality of outer peripheral cutters. A bit portion 44 is provided. Each front cutter part 43 is independently formed in the linear form extended continuously from the center part of the excavation surface board part 41 radially.

  In this case, each front cutter part 43 is formed by melting and fixing a plurality of cutting tips, and is provided with irregular irregularities on the surface continuously. These front cutter parts 43 are filled in the existing pipe 3 and the existing pipe 3 with which the front cutter part 43 contacts by a cutting action by rotating clockwise or counterclockwise in front view while the leading conductor 30 moves forward. The below-mentioned filler and the surrounding ground of the existing pipe 3 can be broken finely.

  The outer peripheral cutter bit portion 44 provided on the leading conductor 30 is formed by continuously attaching the cutter bit in a bent shape from the outer peripheral edge portion of the excavated face plate portion 41 to the outer peripheral side surface of the body portion 31. These outer peripheral cutter bit portions 44 can also excavate the ground with which the outer peripheral cutter bit portion 44 contacts by cutting action by rotating the leading conductor 30 in a clockwise direction or a counterclockwise direction in front view while moving forward.

  The propulsion device 50 that applies propulsive force to the leading conductor 30 as described above is installed in the start shaft 1, and by pressing the leading conductor 30 or the propelling pipe 4 while supporting the leading conductor 30 or the propelling pipe 4, This is a device for propelling the leading conductor 30 and the like along its axial direction, and has the same structure as a propulsion device generally used conventionally.

  Briefly described, as shown in FIG. 4, the propulsion device 50 of the present embodiment is arranged to be slidable in the front-rear direction on the slide base 51 and the slide base 51 fixed to the bottom surface of the start shaft 1. In addition, the apparatus main body 52 that supports and fixes the leading conductor 30 or the propelling pipe 4, the hydraulic cylinder 53 that can move the apparatus main body 52 forward and backward and gives the propelling force of the leading conductor 30 and the propelling pipe 4, and the rotation of the leading conductor 30 and the propelling pipe 4 And a hydraulic motor 54 for applying force.

  The propulsion device 50 is provided with an operation lever 55 and an operation switch (not shown) for performing various operations. The apparatus main body 52 has a rotating portion 52a that is rotatably supported by a bearing (not shown), and the rotation of the hydraulic motor 54 is transmitted to the rotating portion 52a. The hydraulic cylinder 53 and the hydraulic motor 54 are supplied with the hydraulic pressure of the hydraulic unit 13 installed on the ground surface.

  Next, the existing pipe 3 (sewer pipe) buried between the start shaft 1 and the arrival shaft 2 is crushed and the propulsion pipe using the propulsion pipe laying device including the leading conductor 30 and the propulsion device 50 described above. A method of updating the existing pipe 3 to the main pipe 5 by inserting and fixing 4 in order and then inserting and fixing a new main pipe 5 in the propelling pipe 4 will be described with reference to the drawings.

Here, FIG. 5 is a process flow diagram in the renewal work of the existing pipe 3.
When the existing pipe 3 is renewed, first, as shown in FIG. 6, the propulsion device 50 of the propulsion pipe laying device is carried into the start shaft 1 that has been excavated in advance by using a crane or the like. Install and fix to.

  Next, a filling process is performed in which the mortar 62 is filled as a filler in the existing pipe 3 in the entire renewal section. In this filling step, first, a first blocking member (not shown) is attached to the pipe end of the existing pipe 3 on the start shaft 1 side to close the pipe end, and the pipe 3 of the existing pipe 3 on the arrival shaft 2 side. The road end is also closed by attaching the second closing member. In this case, an air vent pipe 61 for venting air from the existing pipe 3 is attached to the first closing member and the second closing member. Further, the first closing member is provided with an injection port for the mortar 62 and connected to the injection hose 22 a of the grout pump 22.

  After the first and second blocking members are attached to both ends of the existing pipe 3, the mortar 62 is produced by mixing and kneading raw materials such as cement and water with the mixer 21 installed on the ground surface. The mortar 62 is pumped by the grout pump 22 to inject and fill the mortar 62 into the existing pipe 3 from the injection hose 22a.

  At this time, for example, by observing the air vent pipe 61 attached to the second closing member and blowing out the mortar 62 from the air vent pipe 61, it can be confirmed that the existing pipe 3 is filled with the mortar 62. . In the present invention, the filler filled in the existing pipe 3 is not limited to the mortar 62, and other materials can be used. Moreover, the injection | pouring conditions of the mortar 62 etc. are set suitably.

  By filling the existing pipe 3 with the mortar 62 in this way, the existing pipe 3 made of vinyl chloride is reinforced, and when the existing pipe 3 is crushed by the hammer head portion 33 and the front cutter portion 43 as will be described later. The existing pipe 3 is prevented from being greatly bent in the ground, and the existing pipe 3 can be finely and stably crushed. After the filling of the mortar 62 is confirmed, the grout pump 22 is stopped to finish the injection operation. In the present invention, either the carrying-in / installing process of the propulsion device 50 or the filling process of the mortar 62 may be performed first.

  After the mortar 62 (filler) filled in the existing pipe 3 is dried and solidified, the first and second closing members are removed. Subsequently, as shown in FIG. 8, the leading conductor 30 of the propulsion pipe laying device is carried into the start shaft 1 using a crane or the like, and the leading conductor 30 is installed on the propulsion device 50 installed in the start shaft 1. Perform the process. Furthermore, a wellhead 63 having a donut-shaped rubber ring is attached to the periphery of the existing pipe 3 in the start shaft 1. By attaching the wellhead 63, it is possible to prevent earth and sand, a lubricant, and compressed air from flowing into the start shaft 1.

  After attaching the wellhead 63, the crushing excavation promotion process which crushes the existing pipe 3 and excavates the ground by propelling the leading conductor 30 is performed. In this crushing excavation propulsion step, the propulsion device 50 is operated, and the leading conductor 30 installed on the propulsion device 50 is rotated in the circumferential direction of the body portion 31 and advanced at a predetermined speed. Further, the air hammer device 34 installed in the leading conductor 30 is operated to give a hammering vibration to the hammer head portion 33 provided on the excavation face plate portion 41 of the leading conductor 30 by the down-the-hole hammer method. Further, water is supplied to the leading conductor 30 from the water pump 19 installed on the ground surface via the water hose 18 and the guide hose 38.

  Thereby, the existing pipe 3 and the mortar 62 filled in the existing pipe 3 are simultaneously crushed by the hammer head part 33, the front cutter part 43 and the outer cutter bit part 44 provided on the leading conductor 30, and the existing pipe 3 Excavate the surrounding ground. At this time, since the mortar 62 is filled in the existing pipe 3, the existing pipe 3 can be crushed finely, uniformly and stably as described above. Moreover, since not only the small hammer head part 33 but the front cutter part 43 and the outer periphery cutter bit part 44 are used, crushing and excavation can be performed efficiently.

  In particular, since the hammer head portion 33 of the present embodiment is disposed in a substantially oval shaped region including the excavation surface center region and the protruding region in the excavation face plate portion 41 of the preconductor 30 as described above, By rotating 30, crushing and excavation can be performed while applying the impact force of the hammer head portion 33 to the entire face of the circular face (excavation surface).

  Further, since the hammer head portion 33 has a protruding region that exceeds the outer diameter of the body portion 31 of the leading conductor 30 in a front view of the leading conductor 30, the area of the circular face that is digged by the leading conductor 30 can be reduced. It can be ensured larger than the area of the circular cross section in the body portion 31 of 30 and the area of the circular cross section in the propulsion pipe 4 following the leading conductor 30. For this reason, when propelling device 50 propels leading conductor 30 and propelling pipe 4, frictional resistance generated between the ground and the ground is reduced, and propulsive force of propulsion apparatus 50 necessary for propelling leading conductor 30 and propelling pipe 4 is reduced. Can be reduced.

  Furthermore, since the drilling face plate portion 41 of the leading conductor 30 of the present embodiment is provided with intake openings 42 on the left and right sides of the hammer head portion 33, the hammer head portion 33, the front cutter portion 43, and the outer cutter The crushed material crushed by the bit portion 44 and the excavated excavated soil can be efficiently taken into the body portion 31 of the leading conductor 30 from the two intake openings 42, thereby the leading conductor 30. The efficiency of crushing and excavation by the excavated face plate portion 41 can be increased.

  Further, the crushed material and excavated soil taken into the body portion 31 of the leading conductor 30 from the two leading openings 42 are supplied from the water pump 19 to the leading conductor 30 via the water feeding hose 18 and the guide hose 38. The water flows toward the start shaft 1 and is discharged to a pot place installed in the start shaft 1. Furthermore, the crushed material and excavated soil discharged in the pottery are separated in the pottery, and then transported to the ground surface for proper treatment.

  After propelling the leading conductor 30 at a predetermined distance by the propulsion device 50, the steel propulsion tube 4 following the leading conductor 30 is installed on the propulsion device 50 and connected to the rear end of the leading conductor 30, and the propulsion tube 4 is advanced by the propulsion device 50 while being rotated in the same manner as the leading conductor 30. As a result, as shown in FIG. 9, the propulsion pipe 4 can be propelled to be buried in the ground while crushing and excavation by the excavation face plate portion 41 of the leading conductor 30 is advanced. Thereafter, the propulsion pipe 4 is sequentially propelled from the start shaft 1 to the arrival shaft 2 by repeatedly performing the installation process of the propulsion pipe 4 and the crushing and excavation processes by rotation and advance of the leading conductor 30 and the propulsion pipe 4. Can be buried.

  Further, in the present embodiment, as described above, the crushing and excavation of the leading conductor 30 by the excavated face plate portion 41 and the embedding of the propelling pipe 4 are advanced, and the operation of injecting the lubricant and measuring the position of the leading conductor 30 are performed. Is repeated. Lubricant injection operation is performed by connecting a lubricant injection hose to an injection hole (not shown) drilled in the leading conductor 30 or the propulsion pipe 4 and injecting the lubricant from the injection hole into the ground around the leading conductor 30 and the propulsion pipe 4. Is done.

  By performing the operation of injecting the lubricant, the friction resistance between the outer peripheral surface of the propulsion tube 4 and the surrounding ground can be reduced, and the propulsion tube 4 can be propelled more efficiently. Further, the outer peripheral surface of the propulsion pipe 4 can be made difficult to be damaged by the surrounding ground, and loosening of the peripheral ground of the propelling pipe 4 can be prevented.

  In addition, by irradiating the target 32 provided on the leading conductor 30 with a laser from the laser transit 23 installed in the starting shaft 1 and repeatedly measuring the position of the leading conductor 30, the orientation and the advancing direction of the leading conductor 30 are grasped. Thus, the direction control of the leading conductor 30 can be stably performed. As a result, the crushing and excavation by the leading conductor 30 can be performed linearly in a predetermined direction and with a predetermined gradient, so that a plurality of propulsion pipes 4 can be connected straight and laid in the ground. it can. In the present invention, the crushing and excavation by the leading conductor 30 can be advanced so as to curve as necessary.

  And when the leading conductor 30 reaches | attains the reaching shaft 2, and it pulls out, all the existing pipes 3 of an update area are crushed and removed, and the propulsion pipe 4 is laid straight in the whole update area. After the leading conductor 30 reaches the reaching shaft 2 and stops the propulsion device 50, the leading conductor 30 is recovered from the reaching shaft 2 and removed. At this time, the leading conductor 30 may be lifted and collected as it is with a crane or the like, or the leading conductor 30 may be disassembled and collected depending on the size of the reaching shaft 2.

  Moreover, while performing the removal process of the leading conductor 30, collect | recover the water supply hose 18 used in order to send water to the leading conductor 30, and the lubricating material injection hose used in order to supply a sliding material from the start shaft 1 side. Remove.

  Furthermore, in order to remove crushed material and excavated soil that cannot be discharged by water and remain in the laid propulsion pipe 4, as shown in FIG. Is introduced and moved toward the start shaft 1. Thereby, the crushed material and excavated soil remaining in the propulsion pipe 4 can be removed and discharged cleanly. Thereafter, the earth excavator 64 that reaches the start shaft 1 is collected, and crushed materials and excavated soil are separated and appropriately processed. At the same time, the propulsion device 50 installed in the start shaft 1 is lifted and removed by a crane or the like.

  After the propulsion device 50 is removed and the laying state of the propulsion pipe 4 is confirmed, the laid propulsion pipe 4 is used as a sheath pipe for the main pipe 5, and a plurality of main pipes 5 are inserted into the sheath pipe and laid. It moves to the process to do.

  In the present embodiment, the main pipe 5 is a hard vinyl chloride pipe having a smaller diameter than the propulsion pipe (sheath pipe) 4 and having a shape as shown in FIG. The main pipe 5 includes a main pipe body 5a having a constant inner diameter, a widening section 5b that gradually increases the inner diameter along the longitudinal direction, and an extended diameter from the widening section 5b, which is the same as the outer diameter of the main pipe main body 5a. And a connecting portion 5c having an inner diameter. A plurality of main pipes 5 can be connected continuously by inserting the main pipe body 5a of the main pipe 5 that follows into the connection section 5c of the main pipe 5.

  Before inserting the main pipe 5 into the propulsion pipe (sheath pipe) 4, it is possible to hold the main pipe 5 at a predetermined position in the propulsion pipe 4 on the main pipe body 5 a of the main pipe 5. A steel spacer band (supporting and fixing band) 6 is attached. As shown in FIG. 15, the spacer band 6 includes an annular belt plate portion 6a that contacts the outer peripheral surface of the main tube 5 and holds the main tube 5, and a tongue piece outward from the cut portion of the belt plate portion 6a. A pair of attachment pieces 6b extending in a shape, a tightening bolt 6c for fastening the pair of attachment pieces 6b, and extending outwardly from the strip 6a along the radial direction. And four leg portions 6d in contact with the peripheral surface.

  A plurality of spacer bands 6 having such a configuration are attached to the outer peripheral surface of the main pipe 5 that is linearly connected at a predetermined interval (for example, at an interval of 2 m) in the longitudinal direction of the main pipe 5. By processing and adjusting the length of the portion 6d according to the installation location of the spacer band 6, a plurality of main pipes 5 that are linearly connected are supported and laid on the sheath pipe 4 with a predetermined gradient. be able to.

  When inserting and laying a plurality of main pipes 5 in the sheath pipe 4, first, a step of attaching one or a plurality of spacer bands 6 to the main pipe main body portion 5a of the main pipe 5 to be inserted into the sheath pipe 4 is performed. Do. Subsequently, as shown in FIG. 12, the main pipe 5 to which the spacer band 6 is attached is carried into the start shaft 1 and inserted from the end of the propulsion pipe 4 (sheath pipe) on the start shaft 1 side. By connecting a plurality of main pipes 5 while performing the insertion process of the main pipe 5 to which such a spacer band 6 is attached one by one, the main pipe 5 is communicated from the starting shaft 1 to the reaching shaft 2. Lay down.

  After the main pipe 5 is inserted into the propulsion pipe 4 and laid, as shown in FIG. 13, a space extending between the main pipe 5 and the propulsion pipe 4 in a donut-like cross-sectional shape along the longitudinal direction is formed. Then, a filling step of filling the mortar 65 as an intermediate material is performed.

  In this filling material filling step, as in the case of the above-described filling material filling step, first, a first closing member (not shown) is attached and closed at the pipe end on the start shaft 1 side, and the reaching shaft 2 side is closed. The pipe end is also closed by attaching the second closing member. In addition, an air vent pipe (not shown) for venting air is attached to the first closing member and the second closing member, and an inlet (not shown) for the mortar 65 is provided in the first closing member, so that the grout pump 22 is provided. The injection hose 22a is connected.

  After attaching the first and second blocking members, a mortar 65 is prepared by mixing and kneading raw materials such as cement and water with a mixer 21 installed on the ground surface, and the produced mortar 65 is pumped by the grout pump 22. Thus, the mortar 65 is injected and filled into the space between the main pipe 5 and the propulsion pipe 4 from the injection hose 22a. In the present invention, the filling material is not limited to the mortar 65, and other materials can be used. Moreover, the injection | pouring conditions of the mortar 65 etc. are set suitably.

  Thus, by filling the space between the main pipe 5 and the propulsion pipe 4 with the mortar 65, the main pipe 5 supported with a predetermined gradient in the propulsion pipe 4 can be fixed, and thereby the main pipe The slope of 5 can be stably maintained. Moreover, since the propulsion pipe 4 is reinforced, the propulsion pipe 4 can be prevented from bending due to stress from the surrounding ground.

  After the filling of the insert material (mortar 65) is completed, the installed equipment and the like are carried out and cleaned, whereby the laying process of the main pipe 5 is completed. By inserting and laying the main pipe 5 into the propulsion pipe 4 as described above, the laying operation of the main pipe 5 can be performed easily and stably, and the main pipe 5 is placed in a predetermined direction. It can be laid stably at a predetermined gradient.

  By performing the above process according to the flow shown in FIG. 5, the existing pipe 3 buried in the ground can be replaced with the main pipe 5, and the sewer pipe can be smoothly updated to the new main pipe 5. . In particular, in this embodiment, even if the existing pipe 3 is made of vinyl chloride, the leading conductor 30 having the hammer head portion 33 and the like shown in FIGS. 2 and 3 is used, and the existing pipe 3 is filled with a filler. Since the crushing and excavation by the leading conductor 30 is performed later, the existing pipe 3 can be finely and stably crushed.

  Further, the crushed material or excavated excavated soil crushed by the leading conductor 30 is efficiently introduced into the body portion 31 of the leading conductor 30 through the two intake openings 42 provided in the excavating face plate portion 41 of the leading conductor 30. Can be discharged stably. For this reason, it becomes possible to advance the leading conductor 30 along the existing pipe 3 at a faster speed than before, and it is possible to shorten the construction period and reduce the costs associated therewith.

  In the above-described embodiment, the case where the existing pipe 3 is renewed using the leading conductor 30 shown in FIGS. 2 and 3 is described. However, in the present invention, the excavated face plate shown in FIG. 3 is used. Instead of the leading conductor 30 having the portion 41, the existing pipe 3 can be renewed by using leading conductors having the excavated face plate portions 41a to 41d as shown in FIGS.

  For example, the leading conductor excavation face plate 41a according to the first modification shown in FIG. 16 includes a hammer head 33, two intake openings 42a, a front cutter 43a, and a plurality of outer cutter bits. 44a. In this case, the hammer head portion 33 is formed in substantially the same manner as the hammer head portion 33 described above.

  The intake opening portion 42a of the first modification is formed so as to penetrate the excavated face plate portion 41a from the front to the rear. Further, the two intake openings 42 a have a symmetrical shape with the hammer head 33 interposed therebetween. In this case, each intake opening 42a is formed slightly different in shape from the intake opening 42 of the above-described embodiment, and the intake opening 42a of the first modified example is in front view of the leading conductor. It is formed in a shape that exhibits a substantially fan shape. Furthermore, the total opening area of the left and right intake opening portions 42a is set to be 6.4% of the entire area of the excavated face plate portion 41a.

  The front cutter portion 43a of the first modification is formed by melting and fixing a cutting tip, and continuously has irregular irregularities on the surface. Moreover, this front cutter part 43a has the cutter center part distribute | arranged adjacent to the hammer head part 33, and the four cutter linear parts extended radially continuously from the cutter center part, The entire cutter portion 43a is integrally formed.

  The outer peripheral cutter bit portion 44a of the first modified example is formed by continuously attaching the cutter bit in a bent shape from the outer peripheral edge portion of the excavation face plate portion 41a to the outer peripheral side surface of the trunk portion. In the first modified example, each outer cutter bit portion 44a is provided with a larger area exposed to the outside than the outer cutter bit portion 44 of the above-described embodiment.

  In the case where the existing pipe is crushed and the surrounding ground of the existing pipe is excavated using the leading conductor of the first modified example having the excavated face plate portion 41a shown in FIG. 16, as in the case of the above-described embodiment, The hammer head portion 33, the front cutter portion 43a, and the outer cutter bit portion 44a can efficiently perform crushing and excavation. In addition, the area of the circular face that is digged with the leading conductor is made larger than the area of the leading conductor body and the circular cross section of the propelling pipe, and the frictional resistance generated between the leading conductor and the propelling pipe and the surrounding ground is reduced. Can be small. Furthermore, since the two conductor openings 41a are provided in the excavation face plate 41a of the leading conductor, crushed materials and excavated soil are efficiently taken into the trunk portion of the leading conductor via the intake opening 42a. Accordingly, the efficiency of crushing and excavation by the excavation face plate portion 41a of the leading conductor can be increased.

  Next, the drilling face plate part 41b of the leading conductor according to the second modification shown in FIG. 17 includes a hammer head part 33, two intake openings 42b, a front cutter part 43a, and a plurality of outer cutters. A bit portion 44a is provided. In this case, the size of the intake opening 42b provided in the second modification is different from the intake opening 42a of the first modification described above, but the hammer head 33, the front cutter 43a, and the outer cutter bit. The part 44a is formed in the same manner as in the first modification.

  In the second modification, the two intake openings 42b have a symmetrical fan-like shape with the hammer head 33 interposed therebetween. Further, the two intake openings 42b are formed in the above-described embodiment so that the total opening area of the left and right intake openings 42b is 14.7% of the total area of the excavated face plate 41b. Or larger than the case of the first modification.

  The leading conductor having the excavated face plate portion 41b provided with such two intake openings 42b has a larger amount of crushed material and excavated soil when excavating the surrounding ground of the existing pipe while crushing the existing pipe. Can be efficiently taken into the body portion of the leading conductor through the take-in opening 42b. For this reason, the leading conductor according to the second modification is preferably used when excavating a relatively soft ground.

  Next, FIG. 18 shows a leading conductor excavation face plate portion 41c according to the third modification, and FIG. 19 shows a leading conductor excavation face plate portion 41d according to the fourth modification.

  The excavation surface board portion 41c according to the third modification example and the excavation surface board part 41d according to the fourth modification example respectively include a hammer head portion 33, two intake openings 42c and 42d, and a front cutter portion. 43a and a plurality of outer cutter bits 44a are provided. In this case, although the size of the intake openings 42c and 42d provided in the third modification and the fourth modification is smaller than the intake opening 42a of the first modification described above, the hammer head The portion 33, the front cutter portion 43a, and the outer cutter bit portion 44a are formed in the same manner as in the first modification.

  In the third modified example, the two intake openings 42 c have symmetrical arcuate shapes with the hammer head 33 interposed therebetween. Further, the left and right intake openings 42c are formed so that the total opening area thereof is 3.1% of the entire area of the excavated face plate 41c. On the other hand, in the fourth modified example, the two intake openings 42d have a symmetrical shape with the hammer head 33 interposed therebetween, and the total opening area thereof is 1 of the entire area of the excavation face plate part 41d. It is formed to be a ratio of 6%.

  In each of the tip conductors having the excavated face plate portions 41c and 41d according to the third and fourth modified examples, the sizes of the intake openings 42c and 42d are the same as those in the above-described embodiment and the first modified example. Therefore, the strength of the excavated face plate portions 41c and 41d can be secured stably. Therefore, the leading conductors according to the third modification and the fourth modification are preferably used when excavating relatively hard ground.

1 start shaft 2 reach shaft 3 existing pipe 4 propulsion pipe (sheath pipe)
5 Main pipe 5a Main pipe body 5b Widening section 5c Connection section 6 Spacer band (supporting and fixing band)
6a Band plate portion 6b Mounting piece portion 6c Clamping bolt 6d Leg portion 11 Truck with crane 12 Dump truck 13 Hydraulic unit 14 Generator 15 Lubricant plant 16 Line oiler 17 Compressor 18 Water supply hose 19 Water supply pump 21 Mixer 22 Grout pump 22a Injection hose DESCRIPTION OF SYMBOLS 23 Laser transit 30 Lead conductor 31 Body part 32 Target 33 Hammer head part 33a Hammer bid 34 Air hammer apparatus 35 Support fixing part 36 Stopper part 37 Air hose 38 Guide hose 39 Hose fixing part 41 Excavation surface board part 41a-41d Excavation surface board part 42 Intake Opening 42a-42d Intake Opening 43, 43a Front Cutter 44, 44a Peripheral Cutter Bit 50 Propulsion Device 51 Slide Base 52 Device Main Body 52a Rolling unit 53 the hydraulic cylinder 54 hydraulic motor 55 operating lever 61 air vent pipe 62 mortar 63 wellhead 64 soil discharge machine (scraper)
65 mortar

In addition, by irradiating the target 32 provided on the leading conductor 30 with a laser from the laser transit 23 installed in the starting shaft 1 and repeatedly measuring the position of the leading conductor 30, the orientation and the advancing direction of the leading conductor 30 are grasped. Thus, the direction control of the leading conductor 30 can be stably performed. As a result, the crushing and excavation by the leading conductor 30 can be performed linearly in a predetermined direction and with a predetermined gradient, so that a plurality of propulsion pipes 4 can be connected straight and laid in the ground. I can .

Claims (11)

A propulsion pipe laying device for crushing an existing pipe (3) buried in the ground and excavating the ground around the existing pipe (3) to propel a propulsion pipe (4), the propulsion pipe ( 4), the leading conductor (30) for crushing the existing pipe (3) and excavating the surrounding ground, and propelling the leading conductor (30) and the propelling pipe (4) from the rear A propulsion pipe laying device comprising a propulsion device (50)
The leading conductor (30) includes a cylindrical body part (31), an excavated face plate part (41, 41a, 41b, 41c, 41d) disposed at a tip of the body part (31), and the body part. An air hammer device (34) installed in (31),
A hammer that performs crushing of the existing pipe (3) and excavation of the surrounding ground by impact vibration transmitted from the air hammer device (34) to the excavation face plate part (41, 41a, 41b, 41c, 41d) A head portion (33) is disposed, and at least one take-up unit for taking in and discharging the crushed material and excavated soil of the existing pipe (3) into the body portion (31) separately from the hammer head portion (33). The insertion opening (42, 42a, 42b, 42c, 42d) is arranged,
A propulsion pipe laying device characterized by that.   The hammer head portion (33) is in front view of the leading conductor (30), and exceeds a central area of the excavation surface including an axial center position of the trunk portion (31) and an outer diameter of the trunk portion (31). The propulsion pipe laying device according to claim 1, wherein the propulsion pipe laying device is arranged in a continuous substantially rectangular or oval shaped region including a projecting region projecting outward.   Two intake openings (42, 42a, 42b, 42c, 42d) are arranged symmetrically with respect to the left and right sides of the hammer conductor (33) in the rotational direction of the leading conductor (30). The propulsion pipe laying device according to claim 1 or 2.   In the front view of the leading conductor (30), the total opening area of the intake openings (42, 42a, 42b, 42c, 42d) is the excavation face plate (41, 41a, 41b, 41c, 41d). The propulsion pipe laying device according to any one of claims 1 to 3, wherein the propulsion pipe laying device is set to be not less than 1% and not more than 15% of the entire area.   A front cutter part (43, 43a) formed by melting and fixing a cutting tip on the excavated face plate part (41, 41a, 41b, 41c, 41d) and having irregular irregularities on the surface is provided. The propulsion pipe laying device according to any one of claims 1 to 4.   The front cutter part (43, 43a) is an outer peripheral edge of the excavation face plate part (41, 41a, 41b, 41c, 41d) from the central part of the excavation face plate part (41, 41a, 41b, 41c, 41d). 6. The propulsion pipe laying device according to claim 5, wherein the propulsion pipe laying device is arranged so as to continuously extend radially toward the portion.   Outer peripheral cutter bit portion (44, 44a) continuously formed in a bent shape from the outer peripheral edge portion of the excavated face plate portion (41, 41a, 41b, 41c, 41d) to the outer peripheral side surface of the body portion (31) The propulsion pipe laying device according to any one of claims 1 to 6, wherein: Between the starting shaft (1) and the reaching shaft (2) excavated on the ground surface, the existing pipe (3) buried in the ground is crushed and the ground around the existing pipe (3) is excavated. A propulsion pipe laying method for propelling the propulsion pipe (4),
Carrying and installing the propulsion pipe laying device according to any one of claims 1 to 7 in the start shaft (1);
Filling the existing pipe (3) with a filler (62);
The hammer head portion (30) of the leading conductor (30) is moved forward while rotating the leading conductor (30) of the propulsion pipe laying device from the starting shaft (1) toward the reaching shaft (2). 33), crushing the existing pipe (3) filled with the filler (62) and excavating the surrounding ground of the existing pipe (3), and
The trunk portion of the tip conductor (30) is crushed and excavated soil of the existing pipe (3) through the intake opening (42, 42a, 42b, 42c, 42d) of the tip conductor (30). (31) Taking in and discharging,
A propulsion pipe laying method comprising:   The propulsion pipe (4) is configured to send water from the ground surface through the water supply hose (18) into the leading conductor (30), and to lay the water from the leading conductor (30) to the rear of the leading conductor (30). The crushed material taken into the trunk portion (31) from the intake opening (42, 42a, 42b, 42c, 42d) and the excavation by flowing toward the start shaft (1) through The method according to claim 8, further comprising discharging the soil.   The propulsion pipe (4) laid by the propulsion pipe laying method according to claim 8 or 9 is used as a sheath pipe, and the main pipe (5) is inserted and laid in the sheath pipe (4). An existing pipe updating method, wherein the pipe (3) is updated to the main pipe (5). Prior to insertion of the main pipe (5), a plurality of spacer bands (6) capable of supporting the main pipe (5) in a predetermined position with respect to the sheath pipe (4) Attached to the outer peripheral surface of 5) at predetermined intervals in the length direction of the main pipe (5),
The main pipe (5) to which the spacer band (6) is attached is inserted into the sheath pipe (4), and the main pipe (5) is supported by the plurality of spacer bands (6). Laying the main pipe (5) in the sheath pipe (4) with a predetermined gradient; and
Filling the space portion between the sheath pipe (4) and the main pipe (5) with a filling material (65), and fixing the position of the main pipe (5) with respect to the sheath pipe (4),
The existing pipe updating method according to claim 10, comprising:

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