JP6313668B2 - Pilot hole drilling jig and rehabilitation pipe connection hole drilling method - Google Patents

Description

  The present invention is based on a pilot hole drilling jig for forming a pilot hole in a rehabilitation pipe for rehabilitating an existing pipe corresponding to a mounting pipe port between the existing pipe and a mounting pipe, and a pilot hole formed in the rehabilitation pipe. The present invention relates to a connection hole drilling method for a rehabilitation pipe that forms a connection opening in the rehabilitation pipe.

  Conventionally, in order to rehabilitate an aged existing pipe, for example, a sewer pipe, a band-shaped member with joints formed on both side edges is drawn into the existing pipe and spirally wound to join adjacent band-shaped members. The rehabilitating pipe is manufactured by joining them together, and a new strip member is supplied to the manufactured rehabilitating pipe so that the rehabilitating pipe is additionally formed in the axial direction of the existing pipe.

  On the other hand, when an attachment pipe is connected to an existing pipe from a ground mass or the like, it is necessary to connect the attachment pipe to a rehabilitation pipe that rehabilitates the existing pipe. In this case, a hole saw is inserted into the mounting pipe from a mass, etc., and the hole saw is rotated to drill a pilot hole, which is a temporary hole as a mark on the rehabilitation pipe. It carries in, and the periphery of a pilot hole is drilled and the connection port connected to the attachment pipe port of an existing pipe and an attachment pipe is formed (for example, refer patent document 1).

JP 2000-15509 A

  By the way, the mounting pipe is often bent from a mass or the like and connected to the existing pipe. In order to pass the bent portion of the mounting pipe, the outer diameter of the hole saw is about 1/2 of the inner diameter of the mounting pipe. Constrained by In addition, when the attachment pipe is connected to the existing pipe at a set angle in the tube axis direction and the circumferential direction, the attachment pipe port between the existing pipe and the attachment pipe has an elliptical shape. Therefore, it is not easy to rotate a hole saw having a diameter smaller than that of the attachment pipe by using a flexible shaft and drill a pilot hole in the rehabilitation pipe at the center of the elliptical attachment pipe opening.

  On the other hand, in order to improve the strength of the composite pipe formed with the rehabilitation pipe by filling the gap between the existing pipe and the rehabilitation pipe, the belt-like member with the reinforcement attached with the metal reinforcement such as a steel plate is spiraled. When the rehabilitation pipe is formed by winding, a metal reinforcing material is helically attached around the rehabilitation pipe. When a pilot hole is formed in such a rehabilitation pipe, when the rotating hole saw comes into contact with the metal reinforcement of the rehabilitation pipe, the difference between the inner and outer diameters of the mounting pipe and the hole saw jumps from the center position set by the TV camera etc. It often deviates and it is extremely difficult to drill the pilot hole reliably at the center position. Temporarily, when the pilot hole is drilled in the rehabilitation pipe off the center of the elliptical mounting pipe port, the drilling device carried into the rehabilitation pipe forms a connection port in the rehabilitation pipe with the pilot hole as a mark. The connection part of an existing pipe and an attachment pipe will be cut with a rehabilitation pipe, and it will interfere with the connection of a rehabilitation pipe and an attachment pipe. As a result, even a skilled worker has to drill the pilot hole through trial and error, so that a lot of time is required and the working efficiency is low.

  The present invention has been made in view of such a problem, and even a rehabilitated pipe manufactured by a belt-like member with a reinforcing material is positioned at substantially the center of the mounting pipe port between the existing pipe and the mounting pipe. In addition to providing a pilot hole drilling jig that can reliably form the pilot hole, a connection port that communicates with the attachment pipe port on the rehabilitation pipe based on the pilot hole formed by the pilot hole drilling jig is provided. It aims at providing the connection hole drilling method of the rehabilitation pipe which can be formed efficiently.

In order to achieve the above-mentioned object, the solution means of the present invention is a pilot that forms a pilot hole in a rehabilitation pipe obtained by rehabilitating an existing pipe to which a mounting pipe is connected, corresponding to a mounting pipe port between the existing pipe and the mounting pipe. A drilling hole jig, a supporting cylinder member provided with a bearing having a rotation function and a sliding function on an inner peripheral surface, a fixing material attached to the supporting cylinder member, and the fixing material via the fixing material A cylindrical packer attached to the outer peripheral surface of the supporting cylindrical member, a cylindrical main body having a cutting blade, and a hole saw having a shaft connected to the cylindrical main body. In the hole saw, the shaft is supported by the support cylinder member via a bearing so as to be rotatable and movable in the axial direction, and the fixing member is provided with a flow path communicating with the inside of the packer. A push-in tubular body is connected to the flow path, and a pressure air supply pipe having a length corresponding to at least a pipe extension of the attachment pipe is connected to the push-in tubular body. The push-in tubular body is a tubular body having a hardness for transmitting a push-in force for pushing the support cylinder member in the axial direction of the attachment pipe to the fixing member, and pushes the support cylinder member in the axial direction. It is configured to position the hole saw to a mounting tube opening.

According to the present invention, the packer is expanded by supplying pressurized air, and the hole saw can be supported by aligning the axis of the attachment tube and the axis of the hole saw with respect to the attachment tube. Further, the hole saw is supported by a bearing having a rotating function and a sliding function provided on the support cylinder member so as to be rotatable and movable in the axial direction. As a result, after the existing pipe is rehabilitated with the rehabilitation pipe, the pilot hole drilling jig is inserted into the mounting pipe, and the pilot hole drilling jig is supported in the vicinity of the mounting pipe port between the existing pipe and the mounting pipe. In addition, by rotating and pushing the hole saw through the flexible shaft, it is possible to reliably form the pilot hole in the rehabilitation pipe at the approximate center of the attachment pipe port. In addition, when inserting into the pipe line up to the attachment pipe port, the support cylinder member can be pushed in via the pressurized air supply pipe and the push-in tubular body, and can be inserted corresponding to various pipe paths. Thus, workability is improved.

  Further, in the pilot hole drilling jig having the above-described configuration, the support cylinder member includes a storage portion that can store the cylindrical body inside, and the cylindrical body moves when the shaft moves in the axial direction. May be allowed to appear and retract from the storage portion of the support cylinder member.

  With this configuration, when the cylindrical main body of the hole saw is housed inside the support cylinder member, the pilot hole drilling jig can be formed in a compact state, and the mounting pipe port in which the pilot hole is provided It is possible to easily insert the pilot hole drilling jig into the pipe line. Further, since the cylindrical main body of the hole saw can be freely protruded and retracted from the storage portion of the support tube member, when the mounting tube port is drilled, it can be pushed out of the support tube member and rotated to form a pilot hole in the mounting tube port. .

Further, a method for drilling a rehabilitating pipe using the pilot hole drilling jig is also within the scope of the technical idea of the present invention. That is, in the rehabilitating pipe connecting hole drilling method of the present invention, the existing pipe to which the mounting pipe is connected is rehabilitated by using the pilot hole drilling jig , and the existing pipe and the mounting pipe are attached. A connection hole drilling method for forming a connection port communicating with a port , wherein the push-in tubular body is connected to a flow path of a fixing material of the pilot hole drilling jig and corresponds to at least a pipe extension of a mounting pipe The supply pipe having a thickness is connected to the push-in tubular body, and the support tubular member is inserted into the attachment pipe from the ground side while pushing the push-pipe tubular body through the supply pipe, and the inside of the packer Supply compressed air, bring the expanded packer into close contact with the inner peripheral surface of the mounting pipe, align the axis of the mounting pipe with the axis of the hole saw, and push the hole saw while rotating to pilot the rehabilitation pipe. Forming holes, The drilling device equipped with a drilling blade with an identification mark in the center is transported from the rehabilitation pipe to the position facing the pilot hole, and the drilling blade identification mark is visually confirmed through the pilot hole. Then, the peripheral portion of the pilot hole is cut a plurality of times to form a connection port that communicates with the attachment tube port in the rehabilitated tube.

  As a result, the pilot hole drilling jig is inserted and supported in the attachment pipe from the ground side, and then the hole saw is pushed in while rotating to form a pilot hole in the rehabilitation pipe. If the pilot hole is formed in the rehabilitation pipe, the pilot hole drilling jig is lifted to the ground side, and then the drilling device equipped with a drilling blade having an identification mark in the center is positioned to face the pilot hole from the rehabilitation pipe To the rehabilitated pipe by drilling the peripheral edge of the pilot hole several times through the drilling blade while visually recognizing the identification mark of the drilling blade through the pilot hole with a TV camera or the like inserted into the mounting pipe. A connection port communicating with the attachment tube port is formed. As a result, the peripheral portion of the pilot hole formed in the rehabilitation pipe located at the approximate center of the attachment pipe opening between the existing pipe and the attachment pipe can be drilled in order by changing the location in the circumferential direction. It is possible to efficiently form a connection port communicating with the.

  According to the pilot hole drilling jig of the present invention, the pilot hole is located at the approximate center of the mounting pipe port between the existing pipe and the mounting pipe, even if the rehabilitation pipe is manufactured by the band member with the reinforcing material. It can be reliably formed.

Further, according to the rehabilitation pipe connection hole drilling method of the present invention, it is possible to efficiently form a connection port communicating with the attachment pipe port in the rehabilitation pipe based on the pilot hole formed by the pilot hole drilling jig. it can.

It is a semi-sectional view showing a pilot hole drilling jig according to a reference example . It is explanatory drawing which shows 1 process of the method of drilling a pilot hole in a renovated pipe using the pilot hole drilling jig which concerns on the said reference example . It is explanatory drawing which shows the post process of FIG. It is explanatory drawing which shows the post process of FIG. It is a top view explaining the relationship between the pilot hole and drilling blade which were formed in the renovated pipe which faces the attachment pipe port of FIG. It is explanatory drawing which shows the post process of FIG. It is a half cross-sectional view showing the pilot hole drilling jig according to an exemplary shape condition of the present invention. Is a half sectional view showing a modification of the pilot hole drilling jig according to an exemplary shape state. It is an explanatory view showing a step of a method of drilling a pilot hole in the rehabilitating pipe using the pilot hole drilling jig according to an exemplary shape state.

  Hereinafter, a pilot hole drilling jig according to an embodiment of the present invention, and a method for drilling a connection hole of a rehabilitated pipe using the pilot hole drilling jig will be described with reference to the drawings.

( Reference example )
FIG. 1 is a half sectional view showing a pilot hole drilling jig 1 according to the first embodiment.

  The pilot hole drilling jig 1 includes a support cylinder member 2, a packer 3 disposed on the outer peripheral surface of the support cylinder member 2, and a rotation fixed to the inner peripheral surface of the support cylinder member 2 via a bush 21. The bearing 4 has a function and a sliding function, and the hole saw 5 is supported by the bearing 4 having a rotating function and a sliding function so as to be rotatable and movable in the axial direction.

  Here, the packer 3 is made of rubber or the like formed in a cylindrical shape, and its one end edge is attached to one end surface of the support cylinder member 2 via a fixing material 31 and the other end is a support cylinder. The member 2 is fixed to the outer peripheral surface of the other end portion via a fixing band 32. Thus, both ends are fixed by connecting the air pipe 6 (see FIG. 2) to the flow path 2a formed in the support cylinder member 2 and operating the air source such as a compressor (not shown) to supply the pressure air. The packer 3 can be expanded to expand the diameter.

  The bearing 4 having a rotating function and a sliding function is a commercially available product (trade name related to manufacture and sale of Nippon Bearing Co., Ltd .: refer to the stroke bush). The outer cylinder 43 is fitted into a bush 21 that is supported and inserted into the outer cylinder 43 and fixed to the inner peripheral surface of the supporting cylinder member 2 via a C ring. As a result, the retainer 41 is supported by the many steel balls 42 and rotates with respect to the outer cylinder 43, and can move in the axial direction. A stopper 431 that prevents the retainer 41 from coming out is provided at each of the front and rear ends of the outer cylinder 43.

  Further, the hole saw 5 is configured by integrally including a cylindrical main body 51 provided with a plurality of cemented carbide tip blades 511 at an opening end in the circumferential direction and a shaft 52. In the hole saw 5, the cylindrical main body 51 is connected to the distal end portion of the shaft 52 in a state where the cylindrical main body 51 protrudes outward from the distal end portion of the support cylindrical member 2. The shaft 52 is supported by a bearing 4 having a rotation function and a sliding function fixed to the support cylinder member 2, and the flexible shaft 7 is detachably connected to the rear end portion of the shaft 52.

  In this case, although not shown in detail, the hole saw 5 may be provided with a drill blade as a leading blade that is located in the center and protrudes from the cylindrical main body 51.

  Next, a drilling method for forming a connection port Sa communicating with the mounting tube port Ka with the mounting tube T on the rehabilitated tube S for rehabilitating the existing tube K using the pilot hole drilling jig 1 configured as described above. Will be described with reference to FIGS.

  In the existing pipe K, the rehabilitation pipe S is manufactured, the gap between the existing pipe K and the rehabilitation pipe S is filled with mortar M, and the existing pipe K is rehabilitated by a composite pipe composed of the rehabilitation pipe S and the mortar M. As the rehabilitating pipe S for rehabilitating the existing pipe K, it is a tubular body that is formed by spirally winding a band member with a reinforcing material to which a metal reinforcing material is attached, and has a high self-supporting strength. You may have. Also in this case, the mortar M is filled as a filling material between the existing pipe K and the renovated pipe S.

  The mortar M is filled in the attachment pipe port Ka between the existing pipe K and the attachment pipe T while being protected by a protection member (not shown). For this reason, the attachment pipe port Ka is opened. However, since the mortar M wraps around between the ribs of the belt-shaped member for producing the rehabilitated pipe S, the mortar M having a thickness substantially corresponding to the height of the ribs is laminated on the outer peripheral surface of the rehabilitated pipe S.

  First, on the ground, the shaft 52 of the hole saw 5 is inserted into the support cylinder member 2 of the pilot hole drilling jig 1 from the front end side, and is supported by the bearing 4 having a rotation function and a sliding function. Further, after connecting the flexible shaft 7 to the rear end of the shaft 52 and further connecting the air pipe 6 to the flow path 2a of the support cylinder member 2, the pilot hole drilling jig 1 is attached to the mounting pipe T through the mass 91 or the like. (See FIG. 2).

  Next, when it is confirmed by the TV camera V that the pilot hole drilling jig 1 has reached the set position, pressurized air is supplied to the packer 3 through the air pipe 6, and the packer 3 is expanded so that the inside of the mounting tube T is expanded. The pilot hole drilling jig 1 is supported on the mounting pipe T in close contact with the peripheral surface. That is, the pilot hole drilling jig 1 is fixed in the vicinity of the mounting pipe port Ka of the mounting pipe T by aligning the axis of the hole saw 5 of the pilot drilling jig 1 with the axis of the mounting pipe T (FIG. 3). reference). The TV camera V is pulled up from the attachment tube T.

  Then, in a state where the pilot hole drilling jig 1 is fixed in the vicinity of the attachment pipe port Ka of the attachment pipe T, the flexible shaft 7 is rotated via a motor (not shown), and the hole saw 5 is rotated by being pushed in, The cylindrical main body of the hole saw 5 on the rehabilitation pipe S (including the mortar M laminated on the outer peripheral surface) at a position where the carbide tip blade 511 substantially corresponds to the center of the attachment pipe port Ka between the existing pipe K and the attachment pipe T. A pilot hole Pa having a diameter substantially corresponding to the diameter of 51 is formed. At this time, the support cylinder member 2 is fixed to the attachment tube T via the expanded packer 3, and the hole saw 5 is rotatable by a bearing 4 having a rotation function and a sliding function provided in the support cylinder member 2. In addition, since the rehabilitating pipe S is supported by being movable in the axial direction, the hole saw The pilot hole Pa can be stably formed by reliably supporting 5 without jumping.

  In this way, if the pilot hole Pa is formed in the rehabilitation pipe S substantially corresponding to the center of the attachment pipe port Ka between the existing pipe K and the attachment pipe T, the pressure air supplied to the packer 3 is supplied to the air pipe 6. By exhausting through, the diameter of the packer 3 is reduced, and the pilot hole drilling jig 1 is pulled out from the mounting pipe T through the mass 91 and the like.

  Next, the TV camera V is inserted into the mounting tube T up to a position near the pilot hole Pa, and a diamond drilling blade having an identification mark 8a (see FIG. 5) in the center (vapor deposition of diamond particles at the tip of the cylindrical body). The hole drilling device 8 loaded with 81) is carried into the rehabilitation pipe S from a manhole or the like and transported to a position facing the pilot hole Pa. Then, while confirming the pilot hole Pa formed in the rehabilitation pipe S with the TV camera V, the drilling blade 81 of the drilling device 8 is raised while rotating, and the peripheral edge of the pilot hole Pa is spaced in the circumferential direction. And cutting a plurality of times to form a connection port Sa communicating with the attachment tube port Ka. That is, the pilot hole Pa formed in the rehabilitation pipe S is formed at a position substantially corresponding to the center of the attachment pipe port Ka between the existing pipe K and the attachment pipe T, so that the cylindrical body 51 of the hole saw 5 is formed. By cutting the drilling blade 81 of the drilling device 8 having an outer diameter slightly larger than the outer diameter in order along the peripheral edge of the pilot hole Pa, the connection port Sa communicating with the mounting pipe port Ka is rehabilitated. S can be formed efficiently.

  Specifically, a mounting pipe T having a nominal diameter of 150 mm is connected to the existing pipe K at an angle of 60 degrees with respect to the axis, and substantially corresponds to the center of an elliptical mounting pipe port Ka having a short diameter of 154 mm and a long diameter of 178 mm. A pilot hole Pa having a diameter of 80 mm was formed by the hole saw 5 in the rehabilitating pipe S at the position to be. Next, while the TV camera V visually recognizes the identification mark 8a having a diameter of 40 mm on the drilling blade 81 having a diameter of 100 mm of the drilling device 8 through the pilot hole Pa, the drilling blade 81 is substantially circumferential in the peripheral portion of the pilot hole Pa. By cutting four times at intervals of 90 degrees, the connection port Sa communicating with the attachment tube port Ka could be formed in the rehabilitated tube S (see FIG. 5).

  That is, when the pilot hole Pa having a diameter of 80 mm is formed at the approximate center of the elliptical mounting pipe port Ka having a short diameter of 154 mm and a long diameter of 178 mm, the distance between the mounting pipe port Ka and the pilot hole Pa is 49 mm and 37 mm on the short diameter side. Therefore, if the identification mark 8a having a diameter of 40 mm of the drilling blade 81 can be visually recognized in the pilot hole Pa by the TV camera V, the drilling blade 81 having a diameter of 100 mm cuts a range of 30 mm from the periphery of the pilot hole Pa. Therefore, it is possible to reliably prevent the attachment tube port Ka from being damaged, and to form the connection port Sa in the renovated tube S.

  The remaining portion when the peripheral edge portion of the pilot hole Pa is cut by the drilling blade 81 can be scraped off by diamond particles on the outer peripheral surface of the tip portion of the drilling blade 81.

  If the connection port Sa communicating with the attachment tube port Ka of the existing tube K and the attachment tube T is formed in the rehabilitation tube S, the peripheral portion of the connection port Sa is finished and processed. A cheese-like repair member made of the same material as S is conveyed to the connection port Sa through the repair packer, heated air is supplied to the repair packer to expand the diameter, and the neck portion is inserted into the attachment tube T through the connection port Sa. The neck portion of the repair member is brought into close contact with the inner peripheral surface of the lower end portion of the attachment pipe T, and the body portion of the repair member is brought into close contact with the inner peripheral surface of the renovated pipe S. At this time, the repair member is softened and melted by being heated by the heated air, and is adhered to the inner peripheral surface of the lower end portion of the attachment tube T and the inner peripheral surface of the renovated tube S in the vicinity of the connection port Sa.

  Thereby, the lower end part of the attachment pipe T is repaired and connected by the repair member through the rehabilitation pipe S and the connection port Sa. And if the rehabilitation pipe | tube S and the attachment pipe | tube T are connected through the repair member, after supplying cooling air instead of heating air and hardening a repair member, supply of air is stopped and it is for repair. The diameter of the packer may be reduced and pulled out through the rehabilitation pipe S.

(Working-shaped state)
Figure 7 is a half cross-sectional view showing the pilot hole drilling jig 1 according to the embodiment forms state of the present invention.

The pilot hole drilling jig 1 according to the present embodiment is characterized in that, with respect to the reference example, the support cylinder member 2 is provided with a storage portion 23 and an air pipe is connected via a rigid tubular body 36. Have. Below, these characteristic parts in the pilot hole drilling jig 1 will be described in detail, and the description of other configurations will be omitted by using the same reference numerals as in the reference example .

  The packer 3 disposed on the outer peripheral surface of the support cylinder member 2 is fixed to the outer peripheral surface on the front end side of the support cylinder member 2 with a fixing band 32 locked to the outer peripheral surface of one end. Further, the other end of the packer 3 is fixed by being fixed to the rear end of the support cylinder member 2 by a fixing member 33. The fixing member 33 is integrally attached to the rear end portion of the support cylinder member 2. The outer peripheral surface of the fixing member 33 is formed in a truncated cone shape whose diameter is reduced toward the rear end portion, and is configured to smoothly reach the vicinity of the attachment tube port Ka without causing insertion resistance to the attachment tube T. .

  Moreover, the support cylinder member 2 has the annular groove 22 opened to the outer peripheral side. The concave groove 22 forms a space for introducing compressed air between the inner surface of the packer 3 provided on the outer peripheral surface. The flow path 2 a of the support cylinder member 2 is provided in the axial direction through the rear end portion of the support cylinder member 2, and communicates with the concave groove 22 of the support cylinder member 2. The fixing member 33 is also provided with a channel 34 having the same diameter as the channel 2 a of the support cylinder member 2 so as to penetrate in the axial direction. The fixing member 33 is disposed so that the flow path 34 is continuous with the flow path 2 a of the support cylinder member 2, and is connected to the rear end portion of the support cylinder member 2.

  A rigid tubular body 36 is connected to the flow path 34 of the fixing member 33 via a metal connection member 35. The hard tubular body 36 is a hard flexible tube having impact resistance, and a synthetic resin composite tube, a reinforced rubber hose for hydraulic piping, or the like can be suitably used. An air pipe (symbol 6 in FIG. 9) for supplying compressed air is connected to the rigid tubular body 36. Thereby, the compressed air supplied from the air pipe reaches the concave groove 22 from the rigid tubular body 36 via the flow path 34 of the fixing member 33 and the flow path 2a of the support cylinder member 2, and is diffused. The packer 3 is inflated.

  In addition, since the hard tubular body 36 is a hard flexible tube having impact resistance, an external force in the axial direction can be transmitted to the fixing member 33. Therefore, the rigid tubular body 36 receives an external force in the axial direction and pushes the pilot hole drilling jig 1 into the inner part of the mounting tube T. That is, by performing an operation of pushing the rigid tubular body 36 from the ground via the air piping, the pilot hole drilling jig 1 is pushed in the insertion direction and can easily reach the set position.

  In the pilot hole drilling jig 1 according to the illustrated embodiment, the support cylinder member 2 is further provided with a storage portion 23. The storage portion 23 is disposed on the distal end side of the support cylinder member 2. In addition, the storage unit 23 includes a substantially columnar inner space corresponding to the cylindrical part 512 of the cylindrical main body 51 of the hole saw 5, substantially the same as the outer diameter of the cylindrical part 512 or larger than the outer diameter of the cylindrical part 512. Thus, the support cylinder member 2 is formed so as to open in the distal direction. Thereby, as shown in FIG. 7, the tubular main body 51 is housed inside the housing portion 23 of the support tubular member 2.

  As described above, the hole saw 5 is supported by the bearing 4 fixed to the inner peripheral surface of the support cylinder member 2 so as to be rotatable inside the support cylinder member 2 and movable in the axial direction. Therefore, the cylindrical main body 51 is allowed to appear and retract from the storage portion 23 of the support cylindrical member 2 as the shaft 52 of the hole saw 5 moves in the axial direction. That is, the cylindrical main body 51 protrudes from the storage portion 23 as the shaft 52 moves in the distal direction of the support cylinder member 2 via the bearing 4. Further, the cylindrical main body 51 is stored inside the storage portion 23 by the shaft 52 moving in the rear end direction of the support cylindrical member 2.

  Thereby, when the cylindrical main body 51 of the hole saw 5 is stored, the pilot hole drilling jig 1 is formed extremely compact as a whole and can be easily inserted even in a narrow pipe line. The Further, when the pilot hole drilling jig 1 is inserted to the set position and the pilot hole Pa is drilled, the cylindrical main body 51 can be used by protruding from the tip of the support cylinder member 2.

  FIG. 8 is a half sectional view showing a modification of the pilot hole drilling jig 1. As shown in the figure, the pilot hole drilling jig 1 includes a cylindrical main body 51 having a size different from that of FIG. The cylindrical main body 51 has an outer diameter equivalent to that of the cylindrical main body 51 shown in FIG. 7, while a cylindrical portion 512 is formed to extend in the axial direction. In this case, corresponding to the cylindrical main body 51, the storage portion 23 of the support cylindrical member 2 is also formed to have a substantially cylindrical inner space that is expanded in the axial direction as compared with the configuration shown in FIG. .

  Thereby, although the pilot hole drilling jig 1 shown in FIG. 8 has a larger cylindrical main body 51, the pilot hole drilling jig 1 retains the same outer shape as the pilot hole drilling jig 1 shown in FIG. It can be formed compactly. In addition, when the cylindrical main body 51 protrudes from the storage portion 23 of the support cylindrical member 2, the protruding amount of the cylindrical main body 51 from the support cylindrical member 2 can be ensured to be larger than the form shown in FIG. Therefore, the carbide tip blade 511 of the rotating cylindrical main body 51 can be made to reach further from the support cylinder member 2, and the pilot hole Pa can be well drilled corresponding to various pipe lines. It becomes possible.

Figure 9 is an explanatory view showing a step of drilling method of the pilot hole Pa carried out using a pilot hole drilling jig 1 according to the embodiment form state.

Pilot hole drilling jig 1 according to this embodiment forms condition not only when it is inserted through the conduit as shown in FIG. 2 to form a pilot hole Pa, further to the conduit as illustrated in FIG. 9 Even if it exists, it can be used conveniently.

  That is, the pipe shown in FIG. 9 is formed of a rising pipe (for example, φ200 mm) in which the mass 91 is a relatively small size, and is connected to a horizontal pulling pipe 92 (for example, φ150 mm) having a smaller diameter than the mass 91. . A mounting pipe T is connected to the horizontal pipe 92, and a downstream end of the mounting pipe T is connected to an existing pipe K which is a sewer main pipe. The existing pipe K is rehabilitated by the rehabilitation pipe S, and the mortar M is filled between the existing pipe K and the rehabilitation pipe S.

The small mass 91 and the horizontal pipe 92 are connected so as to be orthogonal to each other, and the pipe is bent by 90 °. Thus, even for a tube path having a relatively narrow bend a small diameter, since the pilot hole drilling jig 1 of the present embodiment form state is formed compact, smooth bend It can be inserted and inserted into the mounting tube T.

  In the pilot hole drilling jig 1, the flexible shaft 7 is connected to the rear end portion of the shaft 52, and the air pipe 6 is connected to the rigid tubular body 36 connected to the flow path 2 a of the support cylinder member 2. The length of the rigid tubular body 36 is not particularly limited, but in the case of a conduit as shown in FIG. 9, for example, the rigid tubular body 36 such as a rubber hose having a length of 30 cm is connected to the flow path of the support cylinder member 2. Connect to 2a. Further, an air pipe 6 made of an impact-resistant hard polyvinyl chloride pipe having a length corresponding to the pipe extension is connected to the hard tubular body 36.

  As shown in FIG. 9, the pilot hole drilling jig 1 is inserted from the ground through the mass 91 into the horizontal pulling tube 92 and further to the attachment tube T. The cylindrical main body 51 of the hole saw 5 is accommodated in the accommodating portion 23 inside the support cylinder member 2. During this time, the direction of the pilot drilling jig 1 is operated from the ground via the rigid tubular body 36 connected to the air pipe 6 and pushed in the axial direction. As a result, the pushing force is transmitted to the fixing member 33 via the rigid tubular body 36, and the pilot hole drilling jig 1 is smoothly inserted into the inner portion of the pipe line even in a narrow bent portion. Can be inserted easily.

  If it is confirmed by the TV camera V that the pilot hole drilling jig 1 has reached the set position, pressurized air is supplied to the inside of the packer 3 through the air pipe 6 to expand the packer 3. As a result, the pilot hole drilling jig 1 can be brought into close contact with the inner peripheral surface of the attachment tube T and fixed to the attachment tube T (see FIG. 3). The pilot hole drilling jig 1 is fixed in the vicinity of the mounting tube port Ka of the mounting tube T with the axial center of the hole saw 5 aligned with the axial center of the mounting tube T.

  Next, the motor is driven to rotate the flexible shaft 7, and by pushing, the hole saw 5 is rotated and moved toward the distal end of the support cylinder member 2. The cylindrical main body 51 of the hole saw 5 is pushed out from the distal end portion of the support cylinder member 2. The carbide tip blade 511 at the tip of the cylindrical main body 51 forms a pilot hole Pa in the rehabilitation pipe S by its rotation. The pilot hole Pa is formed as an opening having a diameter substantially corresponding to the diameter of the cylindrical body 51 in the rehabilitation pipe S at a position substantially corresponding to the center of the attachment pipe port Ka between the existing pipe K and the attachment pipe T.

  As the pilot hole drilling jig 1, one having a cylindrical main body 51 having a preferable size is selected as shown in FIG. 7 or FIG. 8 according to the connection angle between the existing pipe K and the mounting pipe T. The pilot hole Pa can be satisfactorily formed corresponding to various pipe lines.

  If the pilot hole Pa is formed, the diameter of the packer 3 is reduced and the pilot hole drilling jig 1 is pulled up to the ground. Thereafter, similarly to the steps shown in FIGS. 4 to 6, the peripheral edge portion of the pilot hole Pa is cut from the inside of the rehabilitation pipe S to form the connection port Sa communicating with the attachment pipe port Ka. Since the pilot hole Pa is formed at a position substantially corresponding to the center of the mounting pipe port Ka between the existing pipe K and the mounting pipe T, the connection port Sa is efficiently connected to the rehabilitation pipe S using the pilot hole Pa as a guide. Can be well formed.

  As described above, the pilot hole drilling jig 1 according to the present invention can be used corresponding to various pipe lines by solving the conventional problems, and is made by a belt-shaped member with a reinforcing material. Also for the rehabilitated pipe S, the pilot hole Pa located at the approximate center of the attachment pipe port Ka between the existing pipe K and the attachment pipe T can be reliably and easily formed. Moreover, based on the pilot hole Pa formed by the pilot hole drilling jig 1, the rehabilitating pipe S can be very efficiently formed with the connection port Sa communicating with the attachment tube port Ka.

DESCRIPTION OF SYMBOLS 1 Pilot hole drilling jig 2 Support cylinder member 21 Bush 23 Storage part 3 Packer 31 Fixing material 32 Fixed band 36 Hard tubular body 4 Bearing provided with a rotation function and a sliding function 41 Retainer 42 Steel ball 43 Outer cylinder 431 Stopper 5 Hole saw 51 Tubular body 511 Carbide tip blade 512 Cylindrical part 52 Shaft 6 Air piping 7 Flexible shaft 8 Drilling device 8a Identification mark 81 Drilling blade K Existing pipe Ka Mounting pipe port Pa Pilot hole S Renewal pipe Sa Connection port T Installation tube

Claims (3)

A pilot hole drilling jig that forms a pilot hole corresponding to the mounting pipe port of the existing pipe and the mounting pipe to the rehabilitation pipe renewed from the existing pipe to which the mounting pipe is connected,
A support cylinder member provided with a bearing having a rotation function and a sliding function on the inner peripheral surface;
A fixing member attached to the support cylinder member;
A cylindrical packer attached to the outer peripheral surface of the support cylinder member via the fixing member;
A cylindrical body having a cutting blade and a hole saw having a shaft connected to the cylindrical body,
In the hole saw, the shaft is supported by the support cylinder member so as to be rotatable via a bearing and movable in the axial direction ,
The fixing material is provided with a flow path communicating with the inside of the packer,
A push-in tubular body is connected to the flow path, and a pressure air supply pipe having a length corresponding to at least a pipe extension of the attachment pipe is connected to the push-in tubular body,
Wherein said pushing tubular body, said is a pushing force pushing the support cylinder member in the axial direction of the mounting tube a tubular body having a hardness of transmitting to the fixed member, is pushed the support cylinder member in the axial direction pilot hole drilling jig, wherein the benzalkonium is position on the mounting tube opening a hole saw. In the pilot drilling jig according to claim 1,
The support cylinder member includes a storage portion that can store the cylindrical main body inside,
A pilot hole drilling jig according to claim 1, wherein the cylindrical main body is allowed to protrude and retract from a housing portion of the support cylinder member by moving the shaft in an axial direction. Using the pilot hole drilling jig according to claim 1 or 2, a connection port communicating with a mounting pipe port between the existing pipe and the mounting pipe is formed in a rehabilitation pipe obtained by rehabilitating the existing pipe to which the mounting pipe is connected. A connection hole drilling method to
Connecting the push-in tubular body to the flow path of the fixing material of the pilot hole drilling jig, and connecting the supply pipe having a length corresponding to at least a pipe extension of the attachment pipe to the push-in tubular body;
While pushing the pushing tubular body through the supply pipe, the support cylinder member is inserted into the mounting pipe from the ground side,
Supplying compressed air to the inside of the packer, bringing the expanded packer into close contact with the inner peripheral surface of the mounting tube, and aligning the axis of the mounting tube with the axis of the hole saw,
Push in the hole saw while rotating to form a pilot hole in the rehabilitation pipe,
Next, a drilling device equipped with a drilling blade having an identification mark in the center is conveyed from the rehabilitation pipe to the position facing the pilot hole, and the drilling blade identification mark is visually confirmed through the pilot hole. A connection hole drilling method for a rehabilitation pipe, wherein the peripheral edge of the pilot hole is drilled a plurality of times to form a connection port in the rehabilitation pipe that communicates with the mounting pipe port .

Images