JP7350272B1 - Excavation machine and piping method for excavation machine - Google Patents

Abstract

[Problem] To provide an excavator that is more suitable for situations where it is not necessary to rotate a cutter head part many times. [Solution] The excavating machine includes a main body of the machine, a cutter head portion that is configured to be rotatable relative to the main body of the machine and has an internal space that is not exposed to the soil, and a cutter head that has an internal space that is not exposed to the soil. a partition wall extending at least from the partition wall to the cutter head section and separating the interior space of the cutter head section and the inside space of the cutter head section; The cutter head includes a hollow cylindrical body that communicates with the space, and at least one injection nozzle for ejecting fluid at high pressure, which is provided on the cutter head. The excavator is configured to connect a pipe for supplying fluid to the at least one injection nozzle to the at least one injection nozzle via a route passing through the interior space of the machine, the cylinder body, and the interior space of the cutter head portion without using a swivel. configured as possible. [Selection diagram] Figure 1

Description

The present invention relates to piping technology in an excavator.

2. Description of the Related Art An excavator is conventionally known that includes an excavator main body, a cutter head configured to be rotatable with respect to the excavator main body, and a high-pressure injection nozzle provided in the cutter head. The high-pressure injection nozzle injects fluid depending on the purpose. Such a fluid can be, for example, a ground improvement material or an abrasive jet of water for cutting underground obstacles.

Regarding such an excavator, Patent Document 1 below discloses a technique for supplying fluid from a fluid source to a high-pressure injection nozzle via a main shaft and a swivel. Specifically, a swivel is installed behind a partition wall that partitions the inner space of the excavator body, and the rear end of the main shaft is connected to the swivel. The main shaft extends from the swivel through the partition wall to the internal space of the cutter head, and is configured to be rotatable integrally with the cutter head. The swivel includes a rotating portion that rotates together with the main shaft and a non-rotating portion outside of the rotating portion. A plurality of channels are formed in the rotating portion of the swivel. The non-rotating portion of the swivel is provided with a plurality of ports that communicate with the plurality of channels in the rotating portion. The multiple ports of the swivel are connected to a fluid source via tubing. The plurality of passages in the rotating portion of the swivel are in communication with the plurality of passages passing through the main shaft in the axial direction. In addition, a plurality of ports are provided at the front end of the main shaft to communicate with a plurality of channels of the main shaft. The plurality of ports of the main shaft are connected to a high-pressure injection nozzle via piping arranged in the interior space of the cutter head.

In such excavators, fluid is supplied to the high-pressure injection nozzle via the swivel, so even if the cutter head rotates, the supply line that supplies fluid from the fluid source to the swivel does not rotate. Therefore, the above-mentioned excavator is suitable for a process of injecting fluid from a high-pressure injection nozzle while rotating the cutter head a desired number of times. For example, in the process of cutting underground obstacles with a size equal to or larger than the diameter of an excavator by injecting fluid from a high-pressure injection nozzle while rotating the cutter head, high pressure is applied each time the cutter head rotates. By rotating the cutter head multiple times while changing the radial position of the injection nozzle, it is possible to finely cut the underground obstruction concentrically. Furthermore, by repeating the process of injecting fluid while changing the radial position of the high-pressure injection nozzle while changing the rotational position of the cutter head while the rotation of the cutter head is stopped, the above-mentioned result can be achieved. It is possible to cut medium-sized obstacles into small pieces so that they can be taken into the excavator.

Japanese Patent Application Publication No. 2012-041707

However, until now, there has been no excavator suitable for situations where the cutter head does not need to be rotated many times, so if such a situation occurs, the above-mentioned excavator can be used. It was done. For this reason, there is a need for an excavator that is more suitable for situations where the cutter head does not need to be rotated many times.

The present invention has been made to solve the above-mentioned problems, and can be realized, for example, in the following embodiments.

According to a first aspect of the present invention, an excavator is provided. This excavator consists of an excavator body and a cutter head that is arranged on the front side in the excavation direction with respect to the excavator body and is configured to be rotatable with respect to the excavator body, and has an internal space that is not exposed to soil. a cutter head portion having a cutter head portion, a partition wall that partitions an inner space of the excavator main body into a chamber exposed to soil, and an interior space disposed on the rear side in the excavation direction with respect to the chamber and not exposed to soil; and at least a partition wall. a hollow cylindrical body extending from the to the cutter head and communicating the internal space of the cutter head with the machine interior space; and at least one injection nozzle provided in the cutter head for ejecting fluid at high pressure. , is equipped with. The excavator is configured to connect a pipe for supplying fluid to the at least one injection nozzle to the at least one injection nozzle via a route passing through the interior space of the machine, the cylinder body, and the interior space of the cutter head portion without using a swivel. configured as possible.

According to this excavator, with a simple configuration, piping can be connected from a fluid source installed in the interior of the machine, a shaft, etc. to at least one injection nozzle. Further, a process of injecting fluid from at least one injection nozzle while rotating the cutter head by a rotation angle of 360 degrees or less (a process in which rotation of the cutter head and injecting fluid are performed simultaneously, and a process in which these are performed alternately) An excavator is provided that is suitable for a process in which an excavator is used. In particular, this excavator does not require the preparation of a main shaft and swivel unlike the conventional technology of Patent Document 1, so it is possible to reduce the cost of equipment and shorten the construction period (manufacturing period of the excavator). Become.

According to a second aspect of the invention, in the first aspect, the at least one injection nozzle includes a plurality of injection nozzles. The pipes are a plurality of first pipes each connected to a plurality of injection nozzles, and extend from the plurality of injection nozzles through the internal space of the cutter head section and the cylinder body to near the rear end of the cylinder body. the plurality of first pipes existing in the plurality of pipes, and at least one joint selectively connected to the ends of the plurality of first pipes opposite to the plurality of injection nozzles; at least one second pipe connected to the first pipe. According to this embodiment, the second pipe can be connected only to the first pipe connected to the injection nozzle to be used, depending on the situation. This prevents the pipes connected to unused injection nozzles from extending long backwards inside the excavator (for example, to the shaft or above ground) and from rotating together with the rotation of the cutter head. . Therefore, workability inside the machine is improved.

According to a third aspect of the invention, in the second aspect, the plurality of first pipes and second pipes are in the form of hoses. According to this form, the cost of piping can be reduced.

According to the fourth aspect of the present invention, in any one of the first to third aspects, the cylinder is arranged coaxially with the rotation axis of the cutter head. According to this form, when there is a plurality of at least one injection nozzle and a plurality of pipes are respectively connected to the plurality of injection nozzles, the plurality of pipes are arranged centrally around the rotation axis of the cutter head. can do. As a result, empty cabin space can be used effectively. Alternatively, according to this embodiment, the radial extension distance of the pipe from the front end of the cylinder (the exit of the pipe from the cylinder) to the at least one injection nozzle is approximately constant regardless of the rotational position of the cutter head. It can be done. Therefore, the piping is easy to handle. For example, when the piping is in the form of a hose, there is no need to ensure a slack allowance for the hose to accommodate changes in the extension distance.

According to the fifth aspect of the present invention, in any one of the first to fourth aspects, the cylindrical body projects further rearward in the excavation direction than the partition wall. According to this form, when the cutter head section and, by extension, the pipe connected to the at least one injection nozzle rotate integrally with the cutter head section, the movement range of the pipe can be limited within the cylindrical body. Therefore, the piping does not interfere with other equipment arranged within the cabin space. In other words, the cabin space can be effectively used for arranging other equipment.

According to a sixth aspect of the present invention, a piping method for an excavator is provided. This method includes a machine body, a cutter head part that is arranged on the front side in the direction of excavation with respect to the machine body, and is configured to be rotatable with respect to the machine body, and has an internal space that is not exposed to the soil. A partition wall that partitions the cutter head and the inner space of the excavator body into a chamber exposed to the soil and an interior space that is not exposed to the soil and is disposed on the rear side in the excavation direction with respect to the chamber, and at least from the partition wall. a hollow cylindrical body extending to the cutter head and communicating the internal space of the cutter head with the interior space of the machine; and at least one injection nozzle provided in the cutter head for ejecting fluid at high pressure; A step of preparing an excavating machine comprising: a step of providing a piping for supplying fluid to at least one injection nozzle in a route passing through the interior space of the machine, the cylinder body, and the interior space of the cutter head portion without using a swivel; connecting to one injection nozzle. According to this method, effects similar to those of the first embodiment can be obtained. It is also possible to add any of the second to fourth forms to the fifth form.

1 is a schematic vertical cross-sectional view of an excavator according to an embodiment of the present invention. It is a schematic front view of an excavator.

FIG. 1 is a schematic vertical cross-sectional view of an excavator 10 according to an embodiment of the present invention. FIG. 2 is a schematic front view of the excavator. In the following description, for convenience of explanation, the direction in which the excavator 10 excavates and the direction toward the opposite side thereof are defined as the front-rear direction. Further, the front side in the excavation direction is defined as the front side of the excavator 10, and the rear side in the excavation direction is defined as the rear side of the excavator 10. As shown in FIG. 1, the excavator 10 includes an excavator main body 20 and a cutter head section 30. Each of the excavator main body 20 and the cutter head portion 30 has a substantially cylindrical shape extending in the front-rear direction. The cutter head section 30 is disposed on the front side of the excavator main body 20 and coaxially with the excavator main body 20.

As shown in FIG. 1, the rear portion 31 of the cutter head 30 has an outer diameter smaller than the inner diameter of the excavator main body 20, and is housed inside the excavator main body 20. This cutter head section 30 is configured to be rotatable with respect to the excavator main body 20. Specifically, the cutter head section 30 is rotatably supported by a bearing 21. The outer ring of the bearing 21 is fixed to the excavator main body 20. An inner ring of the bearing 21 is connected to a rear portion 31 of the cutter head portion 30. Further, the rotational driving force of the drive motor 22 is transmitted to the inner ring of the bearing 21 via a power transmission mechanism and a speed reduction mechanism. With such a configuration, the cutter head section 30 is configured to rotate about the rotation axis AX with respect to the excavator main body 20 by the rotational driving force of the drive motor 22.

As shown in FIG. 2, a plurality of (four in the example of FIG. 2) spokes 32 are spanned inside the cutter head portion 30. As shown in FIG. The plurality of spokes 32 extend radially from the substantially cylindrical center of the cutter head 30 and are arranged in a cross shape. Cutter bits 33 and 34 for cutting the ground are attached to each of the plurality of spokes 32. In areas where the spokes 32 are not spanned, a space is formed that penetrates the cutter head portion 30 in the front-rear direction. Note that the number, shape, and arrangement of the spokes 32 are not particularly limited, and can be arbitrarily set according to construction conditions. Further, instead of the spoke type cutter head section 30, a face plate type cutter head section 30 having fewer openings may be adopted.

As shown in FIG. 1, a partition wall 23 is formed near the front end of the excavator body 20 to partition the internal space of the excavator body 20 into a chamber 24 and an interior space 25. The interior space 25 is located at the rear of the chamber 24. Soil enters the chamber 24 through the portions of the cutter head 30 where the spokes 32 are not spanned. On the other hand, the interior space 25 is isolated by the bulkhead 23, so it is not exposed to the soil. Each of the equipment of the excavator main body 20 (for example, the above-mentioned bearing 21 and drive motor 22) is installed in the machine interior space 25. The cutter head portion 30 includes an internal space 35 that is not exposed to soil.

As shown in FIG. 2, a mud drainage hole 26 is formed in the lower part of the partition wall 23, passing through the partition wall 23 in the front-rear direction. The mud drain hole 26 is provided to guide soil that is excavated during excavation by the excavator 10 and has entered the chamber 24 to a discharge device (not shown) installed in the interior space 25.

As shown in FIGS. 1 and 2, the cutter head section 30 is provided with a plurality of injection nozzles 50 and 51 for ejecting fluid at high pressure. In this embodiment, as shown in FIG. 2, two injection nozzles 50 and three injection nozzles 51 are provided, but in FIG. 1, for simplicity of illustration, only one injection nozzle 50 is provided. Illustrated. The injection nozzles 50 and 51 are arranged at the front end of the internal space 35 of the cutter head section 30. In this embodiment, each of the injection nozzles 50 is configured to be movable in the radial direction by an actuator (for example, a hydraulic unit). Specifically, the injection nozzle 50 disposed on the lower side in FIG. 2 is movable from near the center of the cutter head section 30 to the outer edge in the radial direction, and the injection nozzle 50 disposed on the upper side in FIG. 50 is movable so as to protrude further radially outward than the radially outer edge of the cutter head 30 . However, at least one of the injection nozzles 50 may be fixed in position. In FIG. 2, the tips of the injection nozzles 50 and 51 are exposed to the front space of the excavator 10 through the openings of the spokes 32, but when the excavator 10 is used (and the injection nozzles 50, 51 when not in use), this opening is covered with an iron plate or the like.

The spray nozzle 50 sprays ultra-high pressure jet water. Depending on the construction conditions, arbitrary materials such as sodium silicate, abrasives, hardening agents, and polymers may be added to the ultra-high pressure jet water. Ultra-high pressure jet water is injected, for example, to cut underground obstacles. The injection nozzle 51 injects a ground improvement material for improving the soil in front of the excavator 10. The injection pressure of the injection nozzles 50, 51 can be, for example, 100 to 245 MPa depending on the construction conditions. The number of each of the injection nozzles 50, 51 can be any number greater than or equal to 1 depending on the construction conditions. Moreover, one of the injection nozzles 50 and 51 may be omitted.

As shown in FIG. 1, the excavator main body 20 includes a hollow cylindrical body 60. In this embodiment, the cylinder 60 has a cylindrical shape extending in the front-rear direction, and both ends in the front-rear direction are open. The cylindrical body 60 is arranged to extend at least from the partition wall 23 to the cutter head section 30. In this embodiment, the cylindrical body 60 penetrates the partition wall 23 and protrudes further rearward than the partition wall 23 . Further, the cylinder body 60 is arranged coaxially with the rotation axis AX of the cutter head section 30.

In this embodiment, the cutter head portion 30 includes a conical cylindrical portion 36 extending toward the rear side at its center. The front end of the cylindrical body 60 is welded to the rear end 37 of the conical cylindrical portion 36. Therefore, the cylindrical body 60 is configured to rotate integrally with the cutter head section 30. Instead of welding, any fastening means such as bolting may be employed. Further, the rear end 37 is open toward the rear side. Therefore, the interior space 35 of the cutter head section 30 and the interior space 25 communicate with each other through the inside of the cylinder 60. A sealing member (not shown) is arranged between the cylinder 60 and the partition wall 23 along the outer periphery of the cylinder 60. This prevents soil from entering the interior space 25 through the gap between the cylindrical body 60 and the partition wall 23.

In an alternative embodiment, the barrel 60 is secured to the septum 23 by any securing means. In this case, the rear end 37 of the cutter head section 30 and the front end of the cylindrical body 60 are connected via a sealing member so that the cutter head section 30 can rotate relative to the cylindrical body 60.

As shown in FIG. 1, the cylinder 60 is used to pass a pipe 70 for supplying ultra-high pressure jet water and ground improvement material from a fluid source (not shown) to the injection nozzles 50, 51, respectively. The piping 70 is connected to the injection nozzle 50 or the injection nozzle 51 on a route from a fluid source installed in the interior space 25, a shaft, or on the ground, passing through the interior space 25, the inside of the cylinder 60, and the interior space 35 of the cutter head section 30. connected to. Moreover, the piping 70 connects the injection nozzles 50, 51 and the corresponding fluid source without using a swivel or a main shaft as in the above-mentioned conventional technology (Patent Document 1).

As shown in FIG. 2, in this embodiment, the piping 70 includes a plurality of first pipings 71, a plurality of joints 72, and at least one second piping 73. One end of each of the plurality of first pipes 71 is connected to the injection nozzle 50 or 51 (in FIG. 1, only three first pipes 71 are shown for simplicity of illustration). The number of first pipes 71 may be the same as the number of injection nozzles 50, 51. That is, one first pipe 71 may be connected to each of the injection nozzles 50 and 51. Alternatively, the number of first pipes 71 may be greater than the number of injection nozzles 50, 51. In this case, for example, one injection nozzle 50 is provided with a first pipe 71 for supplying a sodium silicate solution (the pressure is, for example, 100 to 245 MPa) and a first pipe 71 for supplying the abrasive slurry (the pressure is, for example, , 1 MPa), and the sodium silicate solution and abrasive slurry may be mixed in the injection nozzle 50. That is, in this embodiment, the injection nozzles 50 and 51 and the plurality of first pipes 71 are connected in a one-to-one or one-to-multiple relationship.

The plurality of first pipes 71 extend from the injection nozzle 50 or 51 to the vicinity of the rear end of the cylinder 60. In this embodiment, the plurality of first pipes 71 extend slightly to the rear of the rear end of the cylindrical body 60. The length of the first pipe 71 connected to the radially movable injection nozzle 50 is set so that no tension is applied when the injection nozzle 50 moves.

A plurality of joints 72 are respectively connected to the other ends of the plurality of first pipes 71 (ends opposite to the injection nozzle 50 or the injection nozzle 51). In this embodiment, the number of first pipes 71 is equal to the number of joints 72. The second pipe 73 is selectively connected only to the joint 72 corresponding to the injection nozzle 50 and/or injection nozzle 51 to be used, depending on the situation (that is, depending on the process to be performed). In an alternative embodiment, depending on the circumstances (i.e. depending on the process to be carried out), the joint 72 and the second pipe 73 are selected for the first pipe 71 corresponding to the injection nozzle 50 and/or injection nozzle 51 used. may be connected to each other. In this embodiment, the first pipe 71 and the second pipe 73 are in the form of hoses. Therefore, the cost of the piping 70 can be reduced.

The cylindrical body 60 may have an inner diameter that allows a person to enter and exit the interior thereof. Such an inner diameter may be, for example, 600 mm or more. In this case, the operator can easily pass the first pipe 71 into the cylindrical body 60. Further, if the diameter of the cutter head section 30 is large and the operator can enter the internal space 35, the operator enters the internal space 35 from the internal space 25 through the cylindrical body 60 and enters the internal space 35. It is also possible to connect the piping 71 and the injection nozzles 50, 51. In this case, the operator may selectively connect the first pipe 71 only to the injection nozzle that he or she wants to use out of the injection nozzles 50 and 51, depending on the situation. Note that if the operator cannot enter the internal space 35, the first pipe 71 and the injection nozzles 50, 51 are connected during the manufacturing (assembly) stage of the excavator 10.

According to the excavator 10 described above, the pipe 70 from the fluid source to the injection nozzles 50 and 51 can be connected with a simple configuration. Further, an excavator 10 suitable for a process of injecting fluid from the injection nozzles 50 and 51 while rotating the cutter head part 30 by a rotation angle of 360 degrees or less (for example, a process of cutting a relatively small obstacle) is provided. Ru. In particular, this excavator 10 does not require a main shaft and a swivel unlike the prior art disclosed in Patent Document 1, so it is possible to reduce the cost of equipment and shorten the construction period.

Further, according to the excavator 10, the second pipe 73 may be connected only to the first pipe 71 connected to the injection nozzle 50 and/or injection nozzle 51 to be used via the joint 72, depending on the situation. I can do it. As a result, the piping connected to the unused injection nozzle 50 and/or injection nozzle 51 extends rearward for a long time (for example, to the shaft or the ground) inside the excavator main body 20, and They do not rotate together when rotating. Therefore, workability inside the machine is improved.

Further, according to the excavator 10, the cylinder 60 (and by extension, the first pipe 71 extending in the front-rear direction) is arranged coaxially with the rotation axis AX of the cutter head section 30. According to this configuration, regardless of the rotational position of the cutter head section 30 (injection nozzles 50, 51), the injection nozzles 50, 51 are The radial extension distance of the first pipe 71 can be made almost constant. Therefore, the first pipe 71 is easy to handle. For example, if the cylindrical body 60 is eccentric, the radial extension distance of the first pipe 71 from the front end of the cylindrical body 60 to the injection nozzles 50, 51 changes as the cutter head section 30 rotates. , it is necessary to ensure a slack allowance for the first pipe 71 to accommodate the change in the extension distance. However, according to the configuration of this embodiment, such slack allowance is hardly required.

Moreover, according to such a coaxial arrangement, the plurality of first pipes 71 can be arranged centrally around the rotation axis AX of the cutter head section 30. As a result, empty cabin space can be used effectively. In particular, in this embodiment, since the cylindrical body 60 protrudes rearward with respect to the partition wall 23, even if the cutter head section 30 rotates, the first pipe 71 is not disposed on the radially outer side of the cylindrical body 60. There will be no interference with other equipment. Therefore, as shown in FIG. 1, the necessary equipment 27 (in this example, the chamber gate jack that is the drive source for the gate that opens and closes the mud drainage hole 26) can be moved to the first pipe 71 without interfering with the first pipe 71. It can be placed near the piping 71 and the bulkhead 23, and the interior space 25 can be used more efficiently and effectively.

Although the embodiments of the present invention have been described above, the embodiments of the invention described above are for facilitating understanding of the present invention, and do not limit the present invention. The present invention may be modified and improved without departing from its spirit, and the present invention includes equivalents thereof. In addition, any combination or omission of each component described in the claims and the specification may be used to the extent that at least part of the above-mentioned problems can be solved or at least part of the effect can be achieved. is possible.

For example, the shape and installation position of the cylinder 60 can be changed arbitrarily. Further, in place of part or all of the piping 70, any type of piping (for example, a rigid steel or resin piping) may be used. For example, even if a hard resin tube is connected to the injection nozzles 50 and 51 (in case the injection nozzle 50 is immovable in the radial direction) and the hard resin tube extends to the vicinity of the rear end of the cylindrical body 60, good. In this case, the joint 72 and the second pipe 73 may be connected to the rear end of the hard resin tube. Alternatively, when the first pipe 71 for the sodium silicate solution and the first pipe 71 for the abrasive slurry are connected to one injection nozzle 50, the first pipe 71 for the sodium silicate solution is connected to the first pipe 71 for the sodium silicate solution. A hard resin tube may be used for the piping 71, and a hose may be used for the first piping 71 for abrasive slurry. Alternatively, a hose connected to a fluid source may be connected to each of the injection nozzles 50 and 51 (the structure that allows intermediate connection by the joint 72 may be omitted).

10...Encavator 20...Encavator main body 21...Bearing 22...Drive motor 23...Bulkhead 24...Chamber 25...Internal space 26...Sludge drainage hole 27.. .Equipment 30... Cutter head 31... Rear part 32... Spokes 33, 34... Cutter bit 35... Internal space 36... Conical cylindrical part 37... Rear end 50 , 51... Injection nozzle 60... Cylindrical body 70... Piping 71... First piping 72... Joint 73... Second piping AX... Rotation axis

Claims (6)

An excavator,
The excavator body,
a cutter head disposed on the front side in the excavation direction with respect to the excavator main body and configured to be rotatable with respect to the excavator main body, the cutter head having an internal space that is not exposed to soil;
a drive motor for providing rotational driving force to the cutter head;
a partition wall that partitions an inner space of the excavator main body into a chamber exposed to the soil and an interior space that is not exposed to the soil and is disposed on the rear side in the excavation direction with respect to the chamber;
a hollow cylindrical body extending from at least the partition wall to the cutter head portion and communicating the internal space of the cutter head portion with the interior space of the machine;
a plurality of first jet nozzles for jetting ultra-high pressure jet water for cutting, provided in the cutter head ;
and a plurality of second injection nozzles provided in the cutter head for injecting the ground improvement material,
configured such that the rotational driving force provided by the drive motor is transmitted to the cutter head portion without passing through the hollow cylindrical body,
A plurality of ultra-high pressure jet water piping for supplying the ultra-high pressure jet water, which are prepared in a one-to-multiple relationship for each of the plurality of first injection nozzles, and the plurality of second injection nozzles. A plurality of soil improvement material pipes for supplying the soil improvement material, which are prepared in a one-to-many relationship for each nozzle, are connected between the interior space of the machine and the inside of the cylinder without using a swivel. An excavator configured to be connectable to each of the plurality of first injection nozzles and the second injection nozzles through a path passing through the internal space of the cutter head section. The excavator according to claim 1,
Each of the plurality of ultra-high pressure jet water pipes and the plurality of ground improvement material pipes,
A plurality of first pipes connected to the plurality of first injection nozzles and the plurality of second injection nozzles, respectively, from the plurality of first injection nozzles and the plurality of second injection nozzles. a plurality of first pipes extending through the internal space of the cutter head portion and the cylindrical body to near the rear end of the cylindrical body;
at least one joint that is respectively or selectively connected to an end of the plurality of first pipings opposite to the plurality of injection nozzles;
at least one second pipe selectively connected to the at least one joint. The excavator according to claim 2,
The plurality of first pipes and the second pipes are in the form of hoses. An excavator. The excavator according to any one of claims 1 to 3,
The cylindrical body is arranged coaxially with the rotational axis of the cutter head. The excavator according to any one of claims 1 to 3,
The cylindrical body protrudes further rearward in the excavation direction than the partition wall. A piping method in an excavator,
The excavator body,
a cutter head disposed on the front side in the excavation direction with respect to the excavator main body and configured to be rotatable with respect to the excavator main body, the cutter head having an internal space that is not exposed to soil;
a drive motor for providing rotational driving force to the cutter head;
a partition wall that partitions an inner space of the excavator main body into a chamber exposed to the soil and an interior space that is not exposed to the soil and is disposed on the rear side in the excavation direction with respect to the chamber;
a hollow cylindrical body extending from at least the partition wall to the cutter head portion and communicating the internal space of the cutter head portion with the interior space of the machine;
a plurality of first jet nozzles for jetting ultra-high pressure jet water for cutting, provided in the cutter head ;
and a plurality of second injection nozzles provided in the cutter head for injecting the ground improvement material,
providing an excavator configured such that the rotational driving force provided by the drive motor is transmitted to the cutter head without passing through the hollow cylinder;
A plurality of ultra-high pressure jet water piping for supplying the ultra-high pressure jet water, which are prepared in a one-to-multiple relationship for each of the plurality of first injection nozzles, and the plurality of second injection nozzles. A plurality of soil improvement material pipes for supplying the soil improvement material, which are prepared in a one-to-many relationship for each nozzle, are connected between the interior space of the machine and the inside of the cylinder without using a swivel. A method for piping in an excavator, comprising: connecting the first injection nozzles and the second injection nozzles to each of the plurality of injection nozzles through a route passing through the internal space of the cutter head.

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