JP2018086621A - Pipe drilling tool and pipe drilling method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pipe drilling tool which removes a foreign matter in a pipe which is buried in a cylindrical portion of a large tank for reinforcing the large tank to be laid on a harbor or the like, and a pipe drilling method.SOLUTION: A pipe drilling tool comprises: a cutting blade which is formed at a tip of the tool and is rotatably fitted; a first guide ball which is connected to the cutting blade via a first connection pipe; a second guide ball which is connected to the first guide ball via a first universal joint; a third guide ball which is connected to the second guide ball via a second connection pipe; a spindle which is slidably fitted to the second connection pipe; a second universal joint which is coupled to the third guide ball; a third connection pipe which is coupled to the second universal joint; and an excavating machine to which the third connection pipe is drivingly connected and which is so located as to be capable of freely advancing and retreating. The pipe drilling tool is so configured as to drill a pipe in which the cutting blade is laid as a sheath in a prestressed concrete structure by operating the excavating machine.SELECTED DRAWING: Figure 4

Description

  This invention is mainly provided in a protective pipe for inserting a reinforcing PC steel wire installed in a circumferential direction of a tank installed in a harbor or the like for storing liquid or gas, and in a protective pipe as described above in a bridge and disaster prevention facility. The present invention relates to an in-pipe excavator for removing foreign matter and an improvement of an excavation method using the excavator.

  Conventionally, for the purpose of improving the strength of tanks that are mainly installed in harbors and that store liquids and gases, protective pipes for inserting PC steel wires have been installed in the concrete casing around the tank. Due to shortage and other work abnormalities, the protective tube may be deformed or damaged, and tank material or other foreign matter may flow into the tube, making it impossible to insert the PC steel wire into the protective tube. There were also similar problems with the protection pipes in the bridge and disaster prevention facilities.

  In such a case, it is necessary to remove the foreign matter in the tube, but it cannot be removed easily. Therefore, the part of the protective tube where the foreign matter is present is removed and a new protective tube is added to that part. A method of repairing the original state has been used.

  However, in such an operation, the process is complicated, and the outer wall of the tank of the corresponding part is torn down and then the outer wall is repaired, but the joint part between the repaired part and the part not to be repaired Since the case where the strength is inferior occurs, it becomes necessary to repair again as time passes, or it may lead to an accident in some cases, which is not preferable.

  Apart from such a method, as a conventional example for removing foreign matter in a tube, for example, Japanese Patent Application Laid-Open No. 2000-346492 discloses an apparatus and method for removing foreign matter in a bent tube. Specifically, as shown in FIG. 7A, in order to remove the foreign matter E in the bent electric heating tube P, the cutting guided by the bearing T at the tip of the support arm A connected to the electric drill D is performed. An embodiment in which the tool B is attached and the electric drill D is operated to remove the foreign matter E is disclosed.

  Further, as another conventional example, as shown in FIG. 7 (b), in order to remove the foreign matter E in the bent electric heating tube P, the straight arm L1 connected to the linear slider LS and the curve connected to the tip thereof. A second embodiment is disclosed in which a discharge electrode H guided by an electrode cover K moving within the protective tube T is attached to the tip of the arm L2, and the linear slider S is operated to remove foreign matter E by the discharge electrode H. ing. A configuration in which a plurality of centering members C are connected to each other by a plurality of torque wires in the bending arm L2 is disclosed.

Japanese Patent Laid-Open No. 2002-34496 (see FIG. 7)

  However, according to the above-described conventional example, on the premise of the heat transfer tube P that is not deformed, a device and a removal method for removing the foreign matter E in the bent electric heating tube P are disclosed, but not only the foreign matter in the tube but the tube itself. An apparatus and a drilling method for excavating foreign matter in a pipe and a deformed pipe in a crushed state are not disclosed.

  Therefore, compared to the case where excavation work is carried out while guiding the excavator in the pipe, when the pipe is filled with foreign matter or deformed and the guide part does not exist, the excavator is inevitably used. It is required that the entire equipment required is different. Under such circumstances, there is a strong demand from the tank installation site so that construction to restore the function of the protective tube at an early stage can be performed.

  The present invention solves the above-described problems, and there is no need to tear down or repair the outer wall of the tank where the foreign matter in the pipe exists, and the repaired part and the part that is not repaired. It is an object of the present invention to provide an in-pipe excavator and an in-pipe excavation method in which the strength of the joint portion is not inferior.

  Another object of the present invention is to provide an in-pipe excavator and an in-pipe excavation method capable of removing foreign matter in a pipe even in a situation where the protective pipe itself is deformed, unlike the conventional example that removes foreign matter in the pipe. And

  In order to achieve the above object, according to the first aspect of the present invention, a cutting blade provided at one end of the connecting pipe and rotatably attached thereto, a universal joint for connecting the plurality of connecting pipes, In-pipe excavation provided with a guide ball and a balance weight formed on the outer periphery of any one of the connection pipes, and a grinder mounted on the other end of the connection pipes so that the connection pipes are driven and moved forward and backward. Made up the ingredients.

  According to a second aspect of the present invention, in the in-pipe excavator according to the first aspect, through holes are formed in the cutting cutting blade, the connecting pipe, and the guide ball, respectively, and the universal joint Is configured such that the through-holes on both sides are coupled with each other by a bypass pipe, and an in-pipe excavator is configured to supply water to the cutting blade through the through-hole and the bypass pipe from one end side to the other end side of the connecting pipe. .

  Furthermore, according to the invention described in claim 3, in the excavating tool for excavating the inside of a pipe laid as a sheath in a prestressed concrete structure, a cutting blade formed at the tip of the first connecting pipe and rotatably attached A first guide ball coupled to the first coupling tube; a second coupling tube coupled to a first universal joint coupled to the first coupling tube; and the second coupling. A second guide ball and a third guide ball attached to the pipe; a balance weight slidably fitted to the first connection pipe and / or the second connection pipe; and the second connection. A second universal joint coupled to the pipe, a third coupling pipe coupled to the second universal joint, and a grinder installed to drive and connect the third coupling pipe and move forward and backward. And For example, to constitute a pipe drilling tool which is adapted to drilling pipe in which the cutting cutting edge is laid as a sheath in prestressed concrete structure by actuating the KezuSusumu machine.

  According to the invention described in claim 4, in a drilling tool for excavating the inside of a pipe laid as a sheath in a prestressed concrete structure, a cutting blade formed at the tip of the first connecting pipe and rotatably attached A first guide ball coupled to the first coupling tube; a second coupling tube coupled to a first universal joint coupled to the first coupling tube; and the second coupling. A second guide ball and a third guide ball attached to the pipe; a balance weight slidably fitted to the first connection pipe and / or the second connection pipe; and the second connection. A second universal joint coupled to the pipe, a third coupling pipe coupled to the second universal joint, and a grinder installed to drive and connect the third coupling pipe and move forward and backward. And be prepared , The cutting blade, the first connecting pipe, the first guide ball, the second guide ball, the second connecting pipe, the third guide ball, and the third connecting pipe, respectively. A through-hole is formed, and the first and second universal joint portions are connected to each other by a bypass pipe between the through-holes on both sides, and the through-hole and the bypass are connected from the cutting machine side to the cutting blade. An in-pipe excavator that can freely supply water to the cutting blade side through a pipe was configured.

  Furthermore, according to the invention described in claim 5, in the excavation method for excavating the inside of a pipe laid as a sheath in a prestressed concrete structure, a cutting blade formed at the tip of the first connecting pipe and rotatably attached A first guide ball coupled to the first coupling tube; a second coupling tube coupled to a first universal joint coupled to the first coupling tube; and the second coupling. A second guide ball and a third guide ball attached to the pipe; a balance weight slidably fitted to the first connection pipe and / or the second connection pipe; and the second connection. A second universal joint coupled to the pipe, a third coupling pipe coupled to the second universal joint, and a grinder installed to drive and connect the third coupling pipe and move forward and backward. When, Provided, it is possible to provide a pipe excavation method of drilling laid down by tube the cutting cutting blade as the sheath in the prestressed concrete structure by actuating the KezuSusumu machine.

  Furthermore, according to the invention described in claim 6, in the excavation method for excavating the inside of a pipe laid as a sheath in a prestressed concrete structure, the cutting blade formed at the tip of the first connecting pipe and rotatably attached A first guide ball coupled to the first coupling tube; a second coupling tube coupled to a first universal joint coupled to the first coupling tube; and the second coupling. A second guide ball and a third guide ball attached to the pipe; a balance weight slidably fitted to the first connection pipe and / or the second connection pipe; and the second connection. A second universal joint coupled to the pipe, a third coupling pipe coupled to the second universal joint, and a grinder installed to drive and connect the third coupling pipe and move forward and backward. When, The cutting cutting blade, the first connecting tube, the first guide ball, the second guide ball, the second connecting tube, the third guide ball, and the third connecting tube. Through holes are respectively formed, and the first and second universal joint portions are connected to each other through the bypass pipes on both sides, and the through holes and the cutting blades are connected from the cutting machine side to the cutting blade. An in-pipe excavation method for excavating a pipe laid as a sheath in a prestressed concrete structure while supplying water to the cutting blade side through a bypass pipe can be provided.

  According to the first aspect of the present invention, a cutting blade provided at one end of the connecting pipe and rotatably attached thereto, a universal joint for connecting the plurality of connecting pipes, and an outer periphery of any of the plurality of connecting pipes An in-pipe excavator characterized by comprising: a guide ball and a balance weight formed on the other end of the connecting pipe; and a cutting machine that is connected to the other end of the connecting pipe to drive and connect the connecting pipe and move forward and backward. it can. In other words, there is no need to destroy or repair the outer wall of the tank where foreign matter is present in the pipe, and a pipe drilling tool that does not deteriorate the strength of the joint between the repaired part and the part that will not be repaired is provided. it can.

  According to a second aspect of the present invention, in the in-pipe excavator according to the first aspect, through holes are formed in the cutting cutting blade, the connecting pipe, and the guide ball, respectively, and the universal joint Since the through holes on both sides are coupled with each other by a bypass pipe, water is supplied to the cutting cutting blade through the through hole and the bypass pipe from one end side to the other end side of the connecting pipe as needed. An in-pipe excavator that can supply water to the cutting blade can be provided.

  Furthermore, according to the invention described in claim 3, in the excavating tool for excavating the inside of a pipe laid as a sheath in a prestressed concrete structure, a cutting blade formed at the tip of the first connecting pipe and rotatably attached A first guide ball coupled to the first coupling tube; a second coupling tube coupled to a first universal joint coupled to the first coupling tube; and the second coupling. A second guide ball and a third guide ball attached to the pipe; a balance weight slidably fitted to the first connection pipe and / or the second connection pipe; and the second connection. A second universal joint coupled to the pipe, a third coupling pipe coupled to the second universal joint, and a grinder installed to drive and connect the third coupling pipe and move forward and backward. And Since the cutting blade is excavated in the pipe laid as a sheath in the prestressed concrete structure by operating the advancing machine, the outer wall of the tank where the foreign matter in the pipe exists is demolished. There is no need to repair the outer wall, the strength of the joint between the repaired part and the part that will not be repaired will not be inferior, and unlike the conventional example that removes foreign matter in the pipe, the protective pipe itself will be deformed It is possible to provide an in-pipe excavator that can remove foreign matter in a pipe even in a situation.

  According to the invention described in claim 4, in a drilling tool for excavating the inside of a pipe laid as a sheath in a prestressed concrete structure, a cutting blade formed at the tip of the first connecting pipe and rotatably attached A first guide ball coupled to the first coupling tube; a second coupling tube coupled to a first universal joint coupled to the first coupling tube; and the second coupling. A second guide ball and a third guide ball attached to the pipe; a balance weight slidably fitted to the first connection pipe and / or the second connection pipe; and the second connection. A second universal joint coupled to the pipe, a third coupling pipe coupled to the second universal joint, and a grinder installed to drive and connect the third coupling pipe and move forward and backward. And be prepared , The cutting blade, the first connecting pipe, the first guide ball, the second guide ball, the second connecting pipe, the third guide ball, and the third connecting pipe, respectively. A through-hole is formed, and the first and second universal joint portions are connected to each other by a bypass pipe between the through-holes on both sides, and the through-hole and the bypass are connected from the cutting machine side to the cutting blade. Since water can be freely supplied to the cutting blade side through a pipe, excavation can be performed while supplying cooling water to the cutting blade side through the through hole and the bypass pipe from the cutting machine side to the cutting blade. Therefore, it is possible to provide an in-pipe excavator capable of operating the cutting blade for a long time and efficiently promoting the work.

  Furthermore, according to the invention described in claim 5, in the excavation method for excavating the inside of a pipe laid as a sheath in a prestressed concrete structure, a cutting blade formed at the tip of the first connecting pipe and rotatably attached A first guide ball coupled to the first coupling tube; a second coupling tube coupled to a first universal joint coupled to the first coupling tube; and the second coupling. A second guide ball and a third guide ball attached to the pipe; a balance weight slidably fitted to the first connection pipe and / or the second connection pipe; and the second connection. A second universal joint coupled to the pipe, a third coupling pipe coupled to the second universal joint, and a grinder installed to drive and connect the third coupling pipe and move forward and backward. When, Since the cutting blade is excavated in the pipe laid as a sheath in the prestressed concrete structure by operating the grinder, the situation is such that the protective pipe itself is deformed unlike the conventional example. Even if it exists, the in-pipe excavation method which can remove the foreign substance in a pipe | tube easily can be provided.

  Furthermore, according to the invention described in claim 6, in the excavation method for excavating the inside of a pipe laid as a sheath in a prestressed concrete structure, the cutting blade formed at the tip of the first connecting pipe and rotatably attached A first guide ball coupled to the first coupling tube; a second coupling tube coupled to a first universal joint coupled to the first coupling tube; and the second coupling. A second guide ball and a third guide ball attached to the pipe; a balance weight slidably fitted to the first connection pipe and / or the second connection pipe; and the second connection. A second universal joint coupled to the pipe, a third coupling pipe coupled to the second universal joint, and a grinder installed to drive and connect the third coupling pipe and move forward and backward. When, The cutting cutting blade, the first connecting tube, the first guide ball, the second guide ball, the second connecting tube, the third guide ball, and the third connecting tube. Through holes are respectively formed, and the first and second universal joint portions are connected to each other through the bypass pipes on both sides, and the through holes and the cutting blades are connected from the cutting machine side to the cutting blade. Since the pipe laid as a sheath in the prestressed concrete structure is excavated while supplying water to the cutting blade side through the bypass pipe, unlike the conventional example, cooling water and the like are completely supplied to the cutting blade side. In addition, it is possible to provide an in-pipe excavation method capable of continuing the work for a long time and easily removing foreign matters in the pipe.

It is a fragmentary sectional view of the horizontal direction of the tank to which this invention is applied. It is sectional drawing of the perpendicular direction of the tank to which this invention is applied. It is principal part explanatory drawing of one Embodiment of this invention. It is principal part detail drawing of one Embodiment of this invention. It is principal part detail drawing of other one Embodiment of this invention. It is a partial explanatory view of one embodiment of this invention. (A) is explanatory drawing which shows a prior art example, (b) is explanatory drawing which shows another prior art example.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings when the present invention is applied to a tank. FIG. 1 is a partial sectional view in the horizontal direction of a tank 1 to which the present invention is applied. Specifically, for example, it is a circular tank having a diameter of 80 m. Projection walls 1a are formed in a plurality of locations (four locations in the present embodiment) around the tank, and protective tubes 1b are embedded in the sidewalls for each section, and the PC steel wire 1c is sectioned from the projection wall 1a. The concrete steel tank 1 is laid so that the strength of the tank 1 can be maintained by tightening the PC steel wire 1c for each section after inserting the PC steel wire 1c.

  Next, FIG. 2 is a vertical sectional view passing through the center of the tank 1 to which the present invention is applied. For example, the central top portion 1d of the tank 1 has a height of more than 50 m from the ground, and the height of the cylindrical portion 1e. It is over 40m above the ground. The thickness of the tank side wall of the cylindrical portion 1e is 80 cm at the base and 65 cm at the top. A plurality of vertical PC steel wires 1f are laid in the vertical direction on the outer periphery of the cylindrical portion 1e, and within the wall thickness of the tank 1 so as to surround the cylindrical portion 1e of the main body inside the side walls at a plurality of vertical locations, A protective tube 1b having a diameter of about 10 cm is embedded in a concrete wall.

  After passing the PC steel wire 1c through the protective tube 1b, the strength of the cylindrical portion 1e of the tank 1 is improved by tightening between both ends of the protruding wall 1a facing the PC steel wire 1c as will be described later. . Further, at the base of the cylindrical portion 1e of the tank 1, piles 1g are made at the lowermost portion so that the tank 1 does not sink underground, and the tank 1 is fixedly installed on the ground surface.

  FIG. 3 is an explanatory view of a main part of an embodiment of the present invention, showing a drilling machine 2 fixed on the ground along the side wall of the tank 1, and a scaffold laid at a predetermined height from the ground. It is fixed to an inclined table 2b attached to a fixed table 2a formed along the side wall of the tank 1 above. The inclined table 2b is fixed to the fixed table 2a by a column 2c having a different length. A guide bar 2d is fixed to the inclined base 2b, and a slider 2e is fitted to the guide bar 2d so as to be movable forward and backward.

  A grinding machine 2f is fixed to the slider 2e by a fixing pin 2g. When the hydraulic motors 2h and 2h are driven by pressure oil supplied from a hydraulic hose 2i by a known control mechanism (not shown), The machine 2f is configured to be capable of moving forward and backward along the inclined base 2b following the slider 2e fitted to the guide bar 2d. That is, when the hydraulic motors 2h and 2h attached to the grinder 2f are operated, the gears (not shown) of the hydraulic motors 2h and 2h are rotated and pinions (not shown) fixed to the connecting pipe 2j of the grinder 2f. As described above, the grinder 2f advances while following the slider 2e fitted to the guide bar 2d. When the hydraulic motors 2h and 2h are operated in opposite directions, the cutting machine 2f moves backward following the slider 2e fitted to the guide bar 2d.

  A water supply swivel joint 2k is attached to the rear end of the connecting pipe 2j, and water is supplied from the water supply hose 2m to the center hole 2n of the connecting pipe 2j and supplied to a drill cutting blade 2y at the tip portion described later. A connecting pipe 2r is connected to the front end of the connecting pipe 2j via a universal joint 2p. A bypass pipe 2s connecting both ends of the universal joint 2p is attached, and a central hole 2n between the connecting pipe 2j and the connecting pipe 2r is mutually connected. It is designed to communicate water supply.

  A universal joint 2p is connected to the other end of the connecting pipe 2r, and both ends thereof are similarly connected by a bypass pipe 2s. Then, a connecting pipe 2t is connected to the universal joint 2p, and a guide ball 2u is attached to the connecting pipe 2t so as not to move in the axial direction.

  On the other hand, the guide column G is fixed to the inclined base 2b, and the guide tube Gb is held by the bearing Ga. The guide tube Gb is fixed to the cylindrical portion protruding wall 1a of the tank by the mounting plate 3 so as to be connected to the protective tube 1b embedded in the cylindrical portion side wall 1f of the tank 1. Connecting pipes 2j, 2r, and 2t of the grinder 2f are inserted into the guide pipe Gb, and a guide ball 2u is rotatably held. The connecting pipe 2t is configured by connecting a plurality of connecting pipes, and a universal joint 2p is connected to the tip of the connecting pipe 2t, and further connected to the connecting pipe 2v. Both ends of the universal joint 2p are connected by a bypass pipe 2s in the same manner as described above. A guide ball 2u is fixed to the connecting pipe 2v with a screw.

  FIG. 4 is a detailed explanatory view of the main part of an embodiment of the present invention, in which the connecting pipe 2v shown in FIG. 3 is shown on the left side, a universal joint 2p is connected to the tip, and further to the universal joint 2p. The connecting pipe 2w is connected to the guide pipe 2w so that the guide ball 2u does not move in the axial direction. Bypass pipes 2s are attached to both ends of the universal joint 2p so that the central holes 2n of both the connecting pipes 2t and 2w communicate with each other. Further, the guide sphere 2u is attached further ahead of the connecting pipe 2w so as not to move in the axial direction, so that the balance weight W can be freely rotated with a gap formed between the inner diameters of the two guide spheres 2u. It is mated.

  The connecting pipe 2w is further connected to the connecting pipe 2x via the universal joint 2p, and both ends of the universal joint 2p are connected by the bypass pipe 2s as described above. A guide ball 2u is attached to the connecting pipe 2x with a small screw m so that the guide ball 2u does not move in the axial direction, and a cutting blade 2y is attached to the opposite side with a screw N. The cutting blade 2y is used to remove foreign matter in the pipe, and a cemented carbide tip is brazed to excavate the foreign matter S in the pipe and the deformed pipe itself. In 2y, the water supply from the water supply hose 2m is poured to cool the cutting edge. Note that it is possible to supply not only the cooling water but also lubricating oil as required.

  FIG. 5 is a detailed view of a main part of another embodiment, and a balance similar to that of FIG. 4 is added by adding a balance weight W between the guide ball 2u of the connecting pipe 2x and the cutting cutting edge 2y. A weight W and a guide ball 2u are attached. In this way, the lateral blurring of the cutting blade 2y can be minimized.

  That is, by attaching the balance weight W between the two guide spheres 2u fixed to the connecting tube 2x holding the cutting blade 2y and / or between the two guide spheres 2u fixed to the adjacent connecting tube 2w, cutting is performed. The blur of the cutting blade 2y can be reduced, and the cutting blade 2y can be operated normally. The most efficient position to prevent lateral blurring of the cutting blade 2y corresponding to the use situation, such as the rotational speed of the cutting blade 2y and the situation unique to the foreign matter S, that is, one of the connecting pipe 2w or 2x, Or the balance weight W should just be attached to both.

  In the above-described embodiment, the case where a plurality of guide balls 2u universal joints 2p and bypass pipes 2s are used has been illustrated, but it is sufficient that each includes at least one or more.

  Next, the operation method and excavation method of the in-pipe excavator configured as described above will be described. As shown in FIG. 3, when pressure oil is supplied via a hydraulic hose 2i by a known control mechanism (not shown), the hydraulic motors 2h and 2h are driven, and the grinder 2f rotates the connecting pipe 2j. Then, it moves forward along the inclined base 2b following the slider 2e fitted to the guide bar 2d. The rotation of the connecting pipe 2j is transmitted to the universal joint 2p and the connecting pipe 2r. Further, the rotation is sequentially transmitted to the cutting blade 2y at the tip.

  Moreover, the cooling water pressurized by the pressurizer which is not shown in figure is supplied from the water supply hose 2m, and a cooling water is supplied to the center hole of the connection pipe 2j from the water supply swivel joint 2k. This cooling water is supplied to the next connecting pipe 2r via the bypass pipe 2s at the universal joint 2p portion. Thereafter, the cutting blade 2y is sequentially flowed through the connecting pipe and supplied to the cutting blade 2y at the tip portion to cool the cutting blade 2y, thereby preventing the cutting blade 2y from being damaged by processing heat.

  The foreign material S in the pipe is excavated by the turning of the cutting cutting edge 2y. However, the cutting cutting edge 2y may be laterally shaken simultaneously with the excavation by the turning of the connecting pipe 2x. However, even in such a case, since the balance weight W is attached, the vibration control function of preventing the horizontal shaking of the cutting blade 2y acts, and the horizontal shaking of the cutting blade 2y hardly occurs. While being guided by the guide ball 2u in the protective tube 1, the cutting blade 2y can excavate the foreign matter S while continuing to advance along the protective tube wall. That is, the connecting pipe 2x normally turns at a speed of about 60 revolutions per minute, but there may be lateral blurring due to the weight of the cutting blade 2y and the cutting resistance. Even in such a case, the balance weight W is manufactured with a slightly smaller diameter than the outer shape of the guide ball 2u, and is fitted in a gap with the connecting pipe 2x. The balance weight W acts while balancing in the direction opposite to the blur direction of the blade 2y, and the cutting blade 2y can be moved straight.

  In addition, since the internal diameter which the cutting cutting blade 2y excavates is set slightly smaller than the internal diameter of the protective tube 1b, the foreign substance residue Sa which cannot be removed by the cutting cutting blade 2y is separately removed with a jet water flow. Further, the amount of work excavated in one cycle by the cutting cutting edge 2y is limited to the amount of excavation debris accumulated between the cutting cutting edge 2y and the guide ball 2u. A large amount of excavated waste is not preferable because it is involved in the rotation of the guide ball 2u and causes a malfunction.

  Therefore, the work must be stopped when moderate excavation waste is generated, and the connecting pipe 2 and the like must be extracted to extract the excavation waste. At that time, as described above, the foreign substance residue Sa that cannot be removed by the cutting blade 2y is removed by a jet water flow, and the foreign substance residue Sa is removed by suction. Thereafter, the excavator including the cutting blade 2y is inserted into the protective tube 1b again to perform excavation work. The foreign matter S in the protective tube 1b is excavated and removed while repeating such operations.

  Here, if the protective tube 1b is not deformed or crushed, the cutting blade 2y proceeds along the inner diameter of the protective tube 1b, and the foreign matter S in the tube can be excavated and removed. However, when the inner diameter of the protective tube 1b is crushed, the protective tube 1b itself is simultaneously excavated and removed by the cutting blade 2y together with the foreign matter S.

  The final excavation work is intended to pass the PC steel wire 1c through the protective tube 1b. Therefore, even if the protective tube 1 is excavated and crushed, the PC steel wire 1c may be passed. It is. In this way, excavation work is sequentially performed for each section of the protruding wall 1a, and after the work is completed in all sections, the PC steel wire 1c is tightened through the PC steel wire 1c into the protective tube 1b.

  It should be noted that the drilling machine 2 fixed on the ground along the side wall of the tank 1 does not cross with the drilling machine 2 installed on the opposite side of the protruding wall 1a apart from the one shown in FIG. Such inconvenience does not occur because they are laid with an inclination angle to each other.

  FIG. 6 is a partial explanatory view of an embodiment of the present invention. After the foreign matter S in the protective tube 1b is removed, a PC steel wire 1c having a bolt attached to the tip from one side in the protective tube 1b is shown. Insert a spiral reinforcing reinforcing bar 1g at the end and fix it to the side surface of the projecting wall 1a by a nut 1h meshing with the bolt at the tip, and similarly compress the spring at the other end of the PC steel wire 1c on the opposite side. A state in which 1 g is attached and fixed to the side surface of the projecting wall 1 a by a nut 1 h meshing with a bolt at the tip is shown.

  Furthermore, by separately preparing a hydraulic jack and pulling the PC steel wire 1c, the PC steel wire 1c is tensioned between the opposing protruding walls 1a, and the tension state is maintained by the action of the spiral reinforcing reinforcing bar 1g. In addition, the tension state due to vibration and secular change does not fluctuate without causing looseness due to the elongation of the PC steel wire 1c. According to the attached state of the PC steel wire 1c, the strength of the tank 1 can be improved because the installation work of the PC steel wire 1c is performed over the entire circumference of the cylindrical portion 1e of the tank 1.

  In the above description, the embodiment in which the tank 1 has a relatively large diameter has been described. Therefore, the embodiment in which the plurality of protruding walls 1a are configured has been described, but is required when the tank 1 has a small diameter. Depending on the strength, the number of protruding walls 1a may be two or one. In that case, two or one protective tube 1b is required, and only one PC steel wire 1c is sufficient.

  Moreover, although embodiment which supplies water to the cutting blade 2y through the through-hole of a connection pipe from the water supply tank was demonstrated, it is not limited to such embodiment, There can also be a method of supplying water separately. For example, there is a case in which excavation is possible without supplying water if lubricating oil or a liquid containing them is supplied without being limited to cooling water and the foreign matter is relatively soft.

  Further, in the above description, the embodiment of the present invention applied to the tank has been described. However, the present invention can be similarly applied to any protective tube laid as a sheath in a prestressed concrete structure. That is, the technical idea of the present invention can be used to remove foreign substances in a protective tube laid as a sheath in a prestressed concrete structure in a bridge or disaster prevention facility.

  In addition, this invention is not limited to the said embodiment, Embodiment can be changed suitably and implemented within the range of the technical idea of this invention.

DESCRIPTION OF SYMBOLS 1 ... Tank 1a ... Projection wall 1b ... Protective tube 1c ... PC steel wire 1f ... Longitudinal PC steel wire 2 ... Drilling machine 2a ... Fixed stand 2b ... Inclined stand 2c ... Stand 2d ... Guide bar 2e ... Slider 2f ... Machining machine 2j, 2r, 2t, 2v, 2w, 2x ... Connecting pipe 2p ... Universal joint 2s ... Bypass Tube 2u ... Guide sphere 2y ... Cutting blade S ... Foreign matter W ... Balance weight

Claims (6)

A cutting blade provided at one end of the connecting pipe and rotatably mounted;
A universal joint for connecting a plurality of the connecting pipes;
A guide ball and a balance weight formed on the outer periphery of any of the plurality of connecting pipes;
An in-pipe excavator comprising: a connecting machine drivingly coupled to the other end of the connecting pipe, and a grinder installed so as to be movable forward and backward. The in-pipe excavator according to claim 1,
Through holes are formed in each of the cutting blade, the connecting pipe, and the guide ball, and the universal joint connects the through holes on both sides with a bypass pipe, and the other end from one end side of the connecting pipe. An in-pipe excavator characterized in that water is supplied to the cutting blade through the through hole and the bypass pipe to the side. In a drilling tool that drills in a pipe laid as a sheath in a prestressed concrete structure,
A cutting blade formed at the tip of the first connecting pipe and rotatably mounted;
A first guide ball coupled to the first connecting pipe;
A second connecting tube coupled to a first universal joint coupled to the first connecting tube, a second guide ball and a third guide ball attached to the second connecting tube;
A balance weight slidably fitted to the first connecting pipe and / or the second connecting pipe;
A second universal joint coupled to the second connecting pipe;
A third connecting pipe coupled to the second universal joint;
A driving machine for driving and connecting the third connecting pipe, and a grinder installed to be movable forward and backward,
An in-pipe excavation tool configured to excavate a pipe in which the cutting blade is laid as a sheath in a prestressed concrete structure by operating the cutting machine. In a drilling tool that drills in a pipe laid as a sheath in a prestressed concrete structure,
A cutting blade formed at the tip of the first connecting pipe and rotatably mounted;
A first guide ball coupled to the first connecting pipe;
A second connecting tube coupled to a first universal joint coupled to the first connecting tube, a second guide ball and a third guide ball attached to the second connecting tube;
A balance weight slidably fitted to the first connecting pipe and / or the second connecting pipe;
A second universal joint coupled to the second connecting pipe;
A third connecting pipe coupled to the second universal joint;
A driving machine for driving and connecting the third connecting pipe, and a grinder installed to be movable forward and backward,
The cutting cutting blade, the first connecting tube, the first guide ball, the second guide ball, the second connecting tube, the third guide ball, and the third connecting tube penetrate each other. A hole is formed, and the first and second universal joint portions are connected to each other by a bypass pipe between the through holes on both sides, and the through hole and the bypass pipe are connected from the cutting machine side to the cutting blade. An in-pipe excavator characterized in that water can be freely supplied to the cutting cutting blade side through. In an excavation method for excavating a pipe laid as a sheath in a prestressed concrete structure,
A cutting blade formed at the tip of the first connecting pipe and rotatably mounted;
A first guide ball coupled to the first connecting pipe;
A second connecting tube coupled to a first universal joint coupled to the first connecting tube, a second guide ball and a third guide ball attached to the second connecting tube;
A balance weight slidably fitted to the first connecting pipe and / or the second connecting pipe;
A second universal joint coupled to the second connecting pipe;
A third connecting pipe coupled to the second universal joint;
A driving machine for driving and connecting the third connecting pipe, and a grinder installed to be movable forward and backward,
An in-pipe excavation method characterized by excavating a pipe in which the cutting blade is laid as a sheath in a prestressed concrete structure by operating the advancing machine. In an excavation method for excavating a pipe laid as a sheath in a prestressed concrete structure,
A cutting blade formed at the tip of the first connecting pipe and rotatably mounted;
A first guide ball coupled to the first connecting pipe;
A second connecting tube coupled to a first universal joint coupled to the first connecting tube, a second guide ball and a third guide ball attached to the second connecting tube;
A balance weight slidably fitted to the first connecting pipe and / or the second connecting pipe;
A second universal joint coupled to the second connecting pipe;
A third connecting pipe coupled to the second universal joint;
A driving machine for driving and connecting the third connecting pipe, and a grinder installed to be movable forward and backward,
The cutting cutting blade, the first connecting tube, the first guide ball, the second guide ball, the second connecting tube, the third guide ball, and the third connecting tube penetrate each other. A hole is formed, and the first and second universal joint portions are connected to each other by a bypass pipe between the through holes on both sides, and the through hole and the bypass pipe are connected from the cutting machine side to the cutting blade. A method for excavating a pipe laid as a sheath in a prestressed concrete structure while supplying water to the cutting blade side through the pipe.

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