JP6977927B2 - In-pipe excavator and in-pipe excavation method - Google Patents

Description

The present invention is mainly provided in a protective pipe for inserting a PC steel wire for reinforcement installed by winding in the circumferential direction of a tank installed in a harbor or the like and storing liquid, gas, etc., or in a protective pipe of the same in a bridge or a 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 store liquids and gases, protective pipes for inserting PC steel wires have been laid inside the concrete frame around the tanks. In some cases, the protective tube was deformed or damaged due to a shortage or other abnormal work, and tank material or other foreign matter flowed into the protective tube, making it impossible to insert the PC steel wire into the protective tube. In addition, there was a similar problem with the same protective pipes in bridges and disaster prevention facilities.

In such a case, it is necessary to remove the foreign matter in the pipe, but it cannot be easily removed. A method has been used in which the work of repairing to the original state is performed.

However, in such work, the process is complicated, and the outer wall of the tank of the corresponding part is demolished and then the outer wall is repaired. It is not preferable because the strength may be inferior, the need for re-repair may occur over a long period of time, and in some cases it may lead to an accident.

Apart from such a method, as a conventional example for removing foreign matter in a pipe, for example, Japanese Patent Application Laid-Open No. 2000-346492 discloses a device and a method for removing foreign matter in a bent pipe. Specifically, as shown in FIG. 7A, cutting guided by a bearing T to the tip of the support arm A connected to the electric drill D in order to remove the foreign matter E in the bent heating tube P. An embodiment in which a bite B is attached and an electric drill D is operated to remove a foreign substance 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 heating tube P, the linear arm L1 connected to the linear slider LS and the curvature connected to the tip thereof are curved. A second embodiment is disclosed in which a discharge electrode H guided by an electrode cover K moving in the protective tube T is attached to the tip of the arm L2, a linear slider S is operated, and the foreign matter E is removed by the discharge electrode H. ing. It should be noted that a configuration in which a plurality of centering members C are connected to each other by a plurality of torque wires is disclosed in the curved arm L2.

Japanese Unexamined Patent Publication No. 2002-346496 (see FIG. 7)

However, according to the above-mentioned conventional example, although the device and the removing method for removing the foreign matter E in the bent electric heating tube P are disclosed on the premise of the heat transfer tube P which is not deformed, not only the foreign matter in the tube but also the tube itself is disclosed. There is no disclosure of a device and an excavation method for excavating foreign matter in the pipe and the deformed pipe in the crushed state.

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

The present invention solves the above-mentioned problems, and it is not necessary to demolish or repair the outer wall of the tank in the portion where foreign matter exists in the pipe, and the repaired portion and the non-repaired portion are defined. 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 a joint portion is not inferior.

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

In order to achieve the above object, according to the invention of claim 1, a cutting cutting edge provided at one end of a connecting pipe and rotatably attached, a universal joint for connecting a plurality of the connecting pipes, and the cutting. A balance weight slidably fitted between two guide balls formed on the outer periphery of the connecting pipe to which a cutting blade is attached, and the connecting pipe is drive-coupled to the other end of the connecting pipe and moved forward and backward. An in-pipe excavator equipped with a freely installed cutting machine was constructed.

Further, according to the invention of claim 2, in an excavator for excavating the inside of a pipe laid as a sheath in a prestressed concrete structure, a cutting cutting blade formed at the tip of a first connecting pipe and rotatably attached. And the first guide ball coupled to the first connecting pipe, the second connecting pipe coupled to the first universal joint coupled to the first connecting pipe, and the cutting cutting edge. A balance weight slidably fitted between two guide balls formed on the outer periphery of the attached connecting pipe, a second universal joint coupled to the second connecting pipe, and the second A third connecting pipe to be coupled to a universal joint and a cutting machine installed to drive and connect the third connecting pipe and to move forward and backward are provided, and the cutting is performed by operating the cutting machine. An in-pipe excavator was constructed in which the cutting edge was designed to excavate the inside of a pipe laid as a sheath in a prestressed concrete structure.

Further, according to the invention of claim 3, in an excavator for excavating the inside of a pipe laid as a sheath in a prestressed concrete structure, a cutting cutting blade formed at the tip of a first connecting pipe and rotatably attached. And the first guide ball coupled to the first connecting pipe, the second connecting pipe coupled to the first universal joint coupled to the first connecting pipe, and the cutting cutting edge. A balance weight slidably fitted between two guide balls formed on the outer periphery of the attached connecting pipe, a second universal joint coupled to the second connecting pipe, and the second A third connecting pipe to be coupled to a universal joint, a cutting machine for driving and connecting the third connecting pipe and a cutting machine installed so as to be able to move forward and backward are provided, and the cutting cutting edge and the first connecting pipe are provided. , The first guide ball, the second guide ball, the second connecting pipe, the third guide ball, and the third connecting pipe are formed with through holes, respectively. In the second universal joint portion, the through holes on both sides are connected to each other by a bypass pipe, and water can be freely supplied from the cutting machine side to the cutting cutting edge through the through hole and the bypass pipe to the cutting cutting edge side. Constructed an in-pipe excavator.

Further, according to the invention of claim 4, in an excavation method for excavating the inside of a pipe laid as a sheath in a prestressed concrete structure, a cutting cutting blade formed at the tip of a first connecting pipe and rotatably attached. And the first guide ball coupled to the first connecting pipe, the second connecting pipe coupled to the first universal joint coupled to the first connecting pipe, and the cutting cutting edge. A balance weight slidably fitted between two guide balls formed on the outer periphery of the attached connecting pipe, a second universal joint coupled to the second connecting pipe, and the second A third connecting pipe to be coupled to a universal joint and a cutting machine installed to drive and connect the third connecting pipe and to move forward and backward are provided, and the cutting is performed by operating the cutting machine. An in-pipe excavation method can be provided in which a cutting edge excavates an in-pipe laid as a sheath in a prestressed concrete structure.

Further, according to the invention of claim 5, in an excavation method for excavating the inside of a pipe laid as a sheath in a prestressed concrete structure, a cutting cutting blade formed at the tip of a first connecting pipe and rotatably attached. And the first guide ball coupled to the first connecting pipe, the second connecting pipe coupled to the first universal joint coupled to the first connecting pipe, and the cutting cutting edge. A balance weight slidably fitted between two guide balls formed on the outer periphery of the attached connecting pipe, a second universal joint coupled to the second connecting pipe, and the second A third connecting pipe to be coupled to a universal joint, a cutting machine for driving and connecting the third connecting pipe and a cutting machine installed so as to be able to move forward and backward are provided, and the cutting cutting edge and the first connecting pipe are provided. , The first guide ball, the second guide ball, the second connecting pipe, the third guide ball, and the third connecting pipe are formed with through holes, respectively. The second universal joint portion connects the through holes on both sides with a bypass pipe, respectively, and is prestressed while supplying water from the cutting machine side to the cutting cutting edge through the through hole and the bypass pipe to the cutting cutting edge side. -It is possible to provide an in-pipe excavation method for excavating the inside of a pipe laid as a sheath in a concrete structure.

According to the invention according to claim 1, a cutting cutting edge provided at one end of a connecting pipe and rotatably attached, a universal joint for connecting a plurality of the connecting pipes, and the connecting pipe to which the cutting cutting edge is attached. A balance weight slidably fitted between two guide balls formed on the outer periphery of the pipe, and a cutting machine installed at the other end of the connecting pipe so as to drive and connect the connecting pipe and to move forward and backward. It is possible to provide an in-pipe excavator characterized by being provided with. That is, there is no need to demolish or repair the outer wall of the tank where foreign matter is present in the pipe, and the strength of the joint between the repaired part and the non-repaired part is not inferior. It is possible to provide an in-pipe excavator capable of moving the cutting cutting edge 2y straight by the balance weight W acting while balancing in the direction opposite to the blurring direction of the connecting pipe 2x and the cutting cutting edge 2y.

Further, according to the invention of claim 2, in an excavator for excavating the inside of a pipe laid as a sheath in a prestressed concrete structure, a cutting cutting blade formed at the tip of a first connecting pipe and rotatably attached. And the first guide ball coupled to the first connecting pipe, the second connecting pipe coupled to the first universal joint coupled to the first connecting pipe, and the cutting cutting edge. A balance weight slidably fitted between two guide balls formed on the outer periphery of the attached connecting pipe, a second universal joint coupled to the second connecting pipe, and the second. A third connecting pipe to be coupled to a universal joint and a cutting machine installed to drive and connect the third connecting pipe and to move forward and backward are provided, and the cutting is performed by operating the cutting machine. Since the cutting edge is configured to excavate the inside of the pipe laid as a sheath in the prestressed concrete structure, there is no need to tear down or repair the outer wall of the tank where foreign matter exists in the pipe, and it is a repair part. The strength of the joint with the unrepaired part is no longer inferior, and unlike the conventional example of removing foreign matter in the pipe, it is possible to remove foreign matter in the pipe even if the protective tube itself is deformed. Possible excavators can be provided.

Further, according to the invention of claim 3, in an excavator for excavating the inside of a pipe laid as a sheath in a prestressed concrete structure, a cutting cutting blade formed at the tip of a first connecting pipe and rotatably attached. And the first guide ball coupled to the first connecting pipe, the second connecting pipe coupled to the first universal joint coupled to the first connecting pipe, and the cutting cutting edge. A balance weight slidably fitted between two guide balls formed on the outer periphery of the attached connecting pipe, a second universal joint coupled to the second connecting pipe, and the second. A third connecting pipe to be coupled to a universal joint, a cutting machine for driving and connecting the third connecting pipe and a cutting machine installed so as to be able to move forward and backward, the cutting cutting edge, and 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 are formed with through holes, respectively. The second universal joint portion connects the through holes on both sides with bypass pipes, respectively, and is configured to freely supply water from the cutting machine side to the cutting cutting edge through the through hole and the bypass pipe to the cutting cutting edge side. Therefore, excavation can be performed from the cutting machine side to the cutting cutting edge while supplying cooling water to the cutting cutting edge side through the through hole and the bypass pipe, and the cutting cutting edge is operated for a long time. It is possible to provide an in-pipe excavator that can efficiently promote work.

Further, according to the invention of claim 4, in an excavation method for excavating the inside of a pipe laid as a sheath in a prestressed concrete structure, a cutting cutting blade formed at the tip of a first connecting pipe and rotatably attached. And the first guide ball coupled to the first connecting pipe, the second connecting pipe coupled to the first universal joint coupled to the first connecting pipe, and the cutting cutting edge. A balance weight slidably fitted between two guide balls formed on the outer periphery of the attached connecting pipe, a second universal joint coupled to the second connecting pipe, and the second A third connecting pipe to be coupled to a universal joint and a cutting machine installed to drive and connect the third connecting pipe and to move forward and backward are provided, and the cutting is performed by operating the cutting machine. Since the cutting edge excavates the inside of the pipe laid as a sheath in the prestressed concrete structure, unlike the conventional example, even if the protective pipe itself is deformed, foreign matter in the pipe can be easily removed. An excavation method that can be removed can be provided.

Further, according to the invention of claim 5, in an excavation method for excavating the inside of a pipe laid as a sheath in a prestressed concrete structure, a cutting cutting blade formed at the tip of a first connecting pipe and rotatably attached. And the first guide ball coupled to the first connecting pipe, the second connecting pipe coupled to the first universal joint coupled to the first connecting pipe, and the cutting cutting edge. A balance weight slidably fitted between two guide balls formed on the outer periphery of the attached connecting pipe, a second universal joint coupled to the second connecting pipe, and the second. A third connecting pipe to be coupled to a universal joint, a cutting machine for driving and connecting the third connecting pipe and a cutting machine installed so as to be able to move forward and backward, the cutting cutting edge, and 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 are formed with through holes, respectively. The second universal joint portion connects the through holes on both sides with a bypass pipe, respectively, and is prestressed while supplying water to the cutting cutting edge side through the through hole and the bypass pipe from the cutting machine side to the cutting cutting edge. -Since the inside of the pipe laid as a sheath in the concrete structure is excavated, unlike the conventional example, the inside of the pipe can be easily continued for a long time while completely supplying cooling water etc. to the cutting cutting edge side. It is possible to provide an excavation method capable of removing foreign matter.

It is a horizontal partial sectional view of the tank to which this invention is applied. It is sectional drawing in the vertical direction of the tank to which this invention is applied. It is explanatory drawing of the main part of this invention. It is a detailed view of the main part of this invention. It is a main part detail view of the embodiment of the present invention. It is a partial explanatory diagram of one embodiment of this invention. It is explanatory drawing which shows the conventional example.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings when applied to the tank. FIG. 1 is a horizontal partial cross-sectional view of a tank 1 to which the present invention is applied, specifically, for example, a circular tank having a diameter of 80 m. Protruding walls 1a are formed in a plurality of planar locations (four locations in the present embodiment) around the tank, and a protective pipe 1b is embedded in the side wall for each section, and the PC steel wire 1c is sectioned from the protruding wall 1a. After inserting each section over the entire circumference, the PC steel wire 1c is tightened for each section, and a concrete tank 1 is laid so as to maintain the strength of the tank 1.

Next, FIG. 2 is a vertical cross-sectional view through the center of the tank 1 to which the present invention is applied. For example, the height of the central top portion 1d of the tank 1 exceeds 50 m from the ground, and the height of the cylindrical portion 1e is high. The height exceeds 40m above the ground. The wall 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 on the outer circumference of the cylindrical portion 1e in the vertical direction. 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 pipe 1b, the strength of the cylindrical portion 1e of the tank 1 is improved by tightening the PC steel wire 1c between both ends of the protruding wall 1a facing each other as described later. .. Further, at the base of the cylindrical portion 1e of the tank 1, 1 g of pile driving is 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 the present invention, showing a drilling machine 2 fixed to the ground along the side wall of the tank 1 and showing the tank 1 on a scaffold laid at a predetermined height from the ground. It is fixed to the inclined table 2b attached to the fixed table 2a formed along the side wall. The tilting table 2b is fixed to the fixing table 2a by columns 2c having different lengths. A guide bar 2d is fixed to the tilting table 2b, and a slider 2e is fitted to the guide bar 2d so that the guide bar 2d can move forward and backward.

A cutting machine 2f is fixed to the slider 2e by a fixing pin 2g, and when the hydraulic motors 2h and 2h are driven by the hydraulic oil supplied from the hydraulic hose 2i by a known control mechanism (not shown), the cutting machine 2h is driven. The machine 2f is configured to be able to move forward and backward along the tilting table 2b, following the slider 2e fitted to the guide bar 2d. That is, when the hydraulic motors 2h and 2h attached to the cutting machine 2f are operated, the gears (not shown) of the hydraulic motors 2h and 2h rotate and the pinion fixed to the connecting pipe 2j of the cutting machine 2f (not shown). The grinder 2f moves forward following the slider 2e fitted to the guide bar 2d as described above while rotating. Further, when the hydraulic motors 2h and 2h operate in opposite directions, the cutting machine 2f retreats 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 the drill cutting 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 center hole 2n between the connecting pipe 2j and the connecting pipe 2r is mutual. It is designed to communicate water supply to the water supply.

Further, 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. A connecting pipe 2t is continuously connected to the universal joint 2p, and the 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 table 2b, and the guide pipe Gb is held by the bearing Ga. The guide pipe Gb is fixed to the cylindrical partial protrusion wall 1a of the tank by a mounting plate 3 so as to be connected to the protective pipe 1b embedded in the cylindrical partial side wall 1f of the tank 1. The connecting pipes 2j, 2r, and 2t of the cutting machine 2f are inserted into the guide pipe Gb to rotatably hold the guide ball 2u. The connecting pipe 2t is configured by connecting a plurality of connecting pipes, a universal joint 2p is connected to the tip thereof, and further connected to the connecting pipe 2v. Both ends of the universal joint 2p are connected by a bypass pipe 2s as in the above case. Further, the guide ball 2u is fixed to the connecting pipe 2v by a screw.

FIG. 4 is a detailed explanatory view of a main part of the present invention, in which the connecting pipe 2v shown in FIG. 3 is shown on the left side, the universal joint 2p is connected to the end thereof, and the connecting pipe 2w is further connected to the universal joint 2p. It is connected, and the guide ball 2u is attached to the connecting pipe 2w so as not to move in the axial direction. Bypass pipes 2S are attached to both ends of the universal joint 2p, and the center holes 2n of both connecting pipes 2t and 2w communicate with each other. Further, the guide ball 2u is attached to the tip of the connecting tube 2w so as not to move in the axial direction, so that the balance weight W can freely rotate by forming a gap in the inner diameter between the two guide balls 2u. It is fitted.

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 in the above case. A guide ball 2u is attached to the connecting pipe 2x by a machine screw m so as not to move in the axial direction, and a cutting cutting edge 2y is attached to the opposite side by a screw N. The cutting cutting edge 2y is used for removing foreign matter in the pipe, and has a carbide tip brazed to it, and excavates the foreign matter S in the pipe and the deformed pipe itself. Water supplied from the water supply hose 2m is poured into 2y to cool the cutting edge. It is also possible to supply not only cooling water but also lubricating oil as needed.

FIG. 5 is a detailed view of a main part of the embodiment, in which a balance weight W is added between the guide ball 2u of the connecting pipe 2x and the cutting cutting edge 2y, and the balance weight W similar to that of FIG. 4 is added. And the guide ball 2u is attached. By doing so, the lateral shake of the cutting cutting edge 2y can be suppressed to the minimum.

That is, by attaching the balance weight W between the two guide balls 2u fixed to the connecting pipe 2x holding the cutting cutting edge 2y, it is possible to reduce the blurring of the cutting cutting edge 2y, and the cutting cutting edge 2y can be reduced. Can be operated normally. If the balance weight W is attached to the most efficient position to prevent lateral shake of the cutting cutting edge 2y according to the usage conditions such as the rotation speed of the cutting cutting edge 2y and the situation peculiar to the foreign matter S, that is, the connecting pipe 2x. good.

In the above-described embodiment, the case where a plurality of guide balls 2u universal joints 2p and bypass tubes 2s are used has been illustrated, but any one may include at least one of each.

Next, the operation method and the 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 the hydraulic hose 2i by a known control mechanism (not shown), the hydraulic motors 2h and 2h are driven, and the cutting machine 2f rotates the connecting pipe 2j and at the same time. , Follows the slider 2e fitted to the guide bar 2d along the tilting table 2b and moves forward. The rotation of the connecting pipe 2j transmits the rotation to the universal joint 2p and the connecting pipe 2r, and the rotation is sequentially transmitted to the cutting edge 2y at the tip portion.

Further, cooling water pressurized by a pressurizing machine (not shown) is supplied from the water supply hose 2m, and cooling water is supplied from the water supply swivel joint 2k to the center hole of the connecting pipe 2j. This cooling water is supplied to the next connecting pipe 2r via the bypass pipe 2s at the universal joint 2p portion. Hereinafter, the cutting blade 2y is sequentially flowed through the connecting pipe and supplied to the cutting cutting blade 2y at the tip portion to cool the cutting cutting blade 2y, thereby preventing damage to the cutting cutting blade 2y due to processing heat.

The foreign matter S in the pipe is excavated by the turning of the cutting cutting blade 2y, but the cutting cutting blade 2y may cause lateral shake at the same time as the excavation due to the turning of the connecting pipe 2x, and a phenomenon that the cutting cutting blade 2y cannot go straight in the pipe occurs. However, even in such a case, since the balance weight W is attached, the vibration damping function of preventing the lateral shake of the cutting cutting edge 2y works, and the lateral shake of the cutting cutting edge 2y is less likely to occur. While being guided by the guide ball 2u in the protective tube 1, the cutting cutting edge 2y can continuously advance along the protective tube wall to excavate the foreign matter S. That is, the connecting pipe 2x normally rotates at a speed of about 60 rotations per minute, but lateral shake may occur due to the weight of the cutting cutting edge 2y and the cutting resistance. Even in such a case, the balance weight W is manufactured with a diameter slightly smaller than the outer shape of the guide ball 2u, and is fitted with the connecting pipe 2x so as to form a gap. The balance weight W acts while balancing in the direction opposite to the blurring direction of the blade 2y, so that the cutting cutting blade 2y can go straight.

Since the inner diameter excavated by the cutting cutting blade 2y is set to be slightly smaller than the inner diameter of the protective tube 1b, the foreign matter residual Sa that cannot be separately removed by the cutting cutting blade 2y is removed by a jet water flow. Further, the amount of work to be excavated in one cycle by the cutting cutting edge 2y is limited to an amount or less in which excavation debris accumulates between the cutting cutting edge 2y and the guide ball 2u. If the amount of excavated waste is large, it is not preferable because it is caught in the rotation of the guide ball 2u and causes a malfunction.

Therefore, when an appropriate amount of excavation waste is generated, the work must be stopped and the connecting pipe 2 and the like must be pulled out to take out the excavation waste. At that time, as described above, the foreign matter residual Sa that cannot be removed by the cutting cutting blade 2y is removed by a jet water stream, and the foreign matter residual Sa is removed by suction. After that, the excavator including the cutting cutting edge 2y is inserted into the protective pipe 1b again to perform the excavation work. While repeating such work, the foreign matter S in the protective tube 1b is excavated and removed.

Here, if the protective tube 1b is not deformed or crushed, the cutting cutting edge 2y advances 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 excavated and removed by the cutting cutting blade 2y at the same time as the foreign matter S.

Since the final excavation work is intended to pass the PC steel wire 1c into the protective pipe 1b, even if the protective pipe 1 is excavated and crushed, the PC steel wire 1c may be passed through. 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 in the protective pipe 1b.

The drilling machine 2 fixedly installed on the ground along the side wall of the tank 1 should not be crossed with the drilling machine 2 installed on the opposite side of the protruding wall 1a separately from the one shown in FIG. Since they are laid at an angle of inclination with each other, such inconvenience does not occur.

FIG. 6 is a partial explanatory view of an embodiment of the present invention, in which a PC steel wire 1c to which a bolt is attached to a tip portion from one of the protective pipes 1b after the foreign matter S in the protective pipe 1b is removed. Insert it, attach a spiral reinforcing bar 1g to the end, fix it to the side surface of the protruding wall 1a with a nut 1h that meshes 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. It shows a state in which 1 g is attached and fixed to the side surface of the protruding wall 1a by a nut 1h that meshes with a bolt at the tip.

Further, 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. At the same time, the tension state due to vibration and aging does not change without loosening due to elongation of the PC steel wire 1c or the like. According to such a mounting state of the PC steel wire 1c, the strength of the tank 1 can be improved because the mounting work of the PC steel wire 1c is carried out over the entire circumference of the cylindrical portion 1e of the tank 1.

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

Further, although the embodiment in which water is supplied from the water supply tank to the cutting cutting edge 2y through the through hole of the connecting pipe has been described, the embodiment is not limited to such an embodiment, and a method of supplying water separately may be possible. For example, not only cooling water but also lubricating oil or a liquid containing them may be supplied, and if the foreign matter is relatively soft, excavation may be possible without supplying water.

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

The present invention is not limited to the above-described embodiment, and the embodiment can be appropriately modified and implemented within the scope of the technical idea of the present invention.

1 ... Tank 1a ... Protruding wall 1b ... Protective pipe 1c ... PC steel wire 1f ... Vertical PC steel wire 2 ... Drilling machine 2a ... Fixed base 2b ... Inclined base 2c ... Support 2d ... Guide bar 2e ... Slider 2f ... Cutting machine 2j, 2r, 2t, 2v, 2w, 2x ... Connecting pipe 2p ... Universal joint 2s ... Bypass Tube 2u ・ ・ ・ Guide ball 2y ・ ・ ・ Cutting cutting edge S ・ ・ ・ Foreign matter W ・ ・ ・ Balance weight

Claims (5)

A cutting cutting edge provided at one end of the connecting pipe and rotatably attached,
A universal joint that connects the plurality of connecting pipes,
A balance weight slidably fitted between two guide balls formed on the outer circumference of the connecting pipe to which the cutting blade is attached, and a balance weight.
An in-pipe excavator characterized in that the other end of the connecting pipe is provided with a cutting machine that drives and connects the connecting pipe and is installed so as to be able to move forward and backward. In excavators that excavate the inside of pipes laid as sheaths in prestressed concrete structures
A cutting cutting edge formed at the tip of the first connecting pipe and rotatably attached,
The first guide ball coupled to the first connecting pipe and
A second connecting pipe coupled to the first universal joint coupled to the first connecting pipe,
A balance weight slidably fitted between two guide balls formed on the outer circumference of the connecting pipe to which the cutting blade is attached, and a balance weight.
A second universal joint coupled to the second connecting pipe,
A third connecting pipe coupled to the second universal joint,
It is equipped with a cutting machine that drives and connects the third connecting pipe and is installed so that it can move forward and backward.
An in-pipe excavator characterized in that the cutting edge is configured to excavate the inside of a pipe laid as a sheath in a prestressed concrete structure by operating the cutting machine. In excavators that excavate the inside of pipes laid as sheaths in prestressed concrete structures
A cutting cutting edge formed at the tip of the first connecting pipe and rotatably attached,
The first guide ball coupled to the first connecting pipe and
A second connecting pipe coupled to the first universal joint coupled to the first connecting pipe,
A balance weight slidably fitted between two guide balls formed on the outer circumference of the connecting pipe to which the cutting blade is attached, and a balance weight.
A second universal joint coupled to the second connecting pipe,
A third connecting pipe coupled to the second universal joint,
It is equipped with a cutting machine that drives and connects the third connecting pipe and is installed so that it can move forward and backward.
Penetrates the cutting cutting edge, 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 hole is formed, and the first and second universal joint portions are connected to each other through the through holes on both sides by a bypass pipe, and the through hole and the bypass pipe are connected from the cutting machine side to the cutting cutting edge. An in-pipe excavator characterized by being configured to freely supply water to the cutting edge side through the cutting blade. In an excavation method for excavating the inside of a pipe laid as a sheath in a prestressed concrete structure.
A cutting cutting edge formed at the tip of the first connecting pipe and rotatably attached,
The first guide ball coupled to the first connecting pipe and
A second connecting pipe coupled to the first universal joint coupled to the first connecting pipe,
A balance weight slidably fitted between two guide balls formed on the outer circumference of the connecting pipe to which the cutting blade is attached, and a balance weight.
A second universal joint coupled to the second connecting pipe,
A third connecting pipe coupled to the second universal joint,
It is equipped with a cutting machine that drives and connects the third connecting pipe and is installed so that it can move forward and backward.
An in-pipe excavation method, wherein the cutting edge excavates the inside of a pipe laid as a sheath in a prestressed concrete structure by operating the cutting machine. In an excavation method for excavating the inside of a pipe laid as a sheath in a prestressed concrete structure.
A cutting cutting edge formed at the tip of the first connecting pipe and rotatably attached,
The first guide ball coupled to the first connecting pipe and
A second connecting pipe coupled to the first universal joint coupled to the first connecting pipe,
A balance weight slidably fitted between two guide balls formed on the outer circumference of the connecting pipe to which the cutting blade is attached, and a balance weight.
A second universal joint coupled to the second connecting pipe,
A third connecting pipe coupled to the second universal joint,
It is equipped with a cutting machine that drives and connects the third connecting pipe and is installed so that it can move forward and backward.
Penetrates the cutting edge, 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 hole is formed, and the first and second universal joint portions are connected to each other through the through holes on both sides by a bypass pipe, respectively, and the through hole and the bypass pipe are connected from the cutting machine side to the cutting cutting edge. An in-pipe excavation method characterized by excavating the inside of a pipe laid as a sheath in a prestressed concrete structure while supplying water to the cutting edge side through the cutting blade.

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