JP4731464B2 - Tunnel excavator and tunnel excavation method - Google Patents

Description

  The present invention relates to a tunnel excavator for embedding a small-diameter pipe body such as a gas pipe or a sewer pipe in the ground, and a tunnel excavation method using the tunnel excavator.

  Conventionally, in order to embed pipes such as sewage pipes with a small diameter in the ground, a tunnel excavator is installed and installed in a vertical shaft, and a small-diameter tunnel is dug by starting toward the ground in front. The tunnel excavator is successively followed by a small-diameter tubular body having a predetermined length, and propelled and buried every time a tunnel having a predetermined length is excavated.

  As such a tunnel excavator, for example, as described in Patent Document 1, a partition wall is provided in the front portion of the cylinder forming the front half of the skin plate, and the front ground of the cylinder is provided on the partition wall. A cutter unit that rotatably supports a rotating shaft of a cutter head for excavating the cutter head, and a drive motor that rotationally drives the cutter head in a cylinder forming the second half of the skin plate, and this A motor unit formed by dividing the cylinder into front and rear cylinder parts and connecting the front and rear cylinder parts with a plurality of direction correcting jacks, and connecting the motor unit to the cutter unit and The thing of the structure provided with the pipe line which is a discharge means is known.

In order for a tunnel excavator to function, the above-mentioned cutter unit and motor unit are required at a minimum. While making it easy, excavation and direction correction of curved tunnels and the like are enabled by a direction correction jack during excavation.
JP 2002-47892 A

  However, in the motor unit provided with the middle folding mechanism in which the front and rear cylinder short portions are refractably coupled by the direction correcting jack as described above, the length of the cylindrical body is longer by the amount having the middle folding mechanism. For this reason, when the area of the shaft is small, such as when a site for a wide shaft cannot be secured or when an existing manhole is used as a shaft, the cutter unit and the motor unit are Even if it can be carried separately into the shaft, it will be difficult to assemble in the shaft and tunnel construction will not be possible. Further, as a matter of course, there is a problem that even if the cutter unit and the motor unit are connected on the ground, they cannot be carried into the shaft.

  The present invention has been made in view of such problems, and the object of the present invention is to enable the carrying-in into the shaft in the assembled state even if the shaft has a small area, and from the shaft. To provide a tunnel excavating machine that can easily excavate a tunnel to the ground in front of it, and that can also change the direction during excavation, and a tunnel excavating method using this tunnel excavator.

  In order to achieve the above object, according to the tunnel excavator of the present invention, as described in claim 1, a cutter head for excavating the front ground is rotatably supported on a partition wall provided in a front portion of a cylindrical body. And a driving motor for rotating the cutter head in a long cylindrical body that is divided into front and rear cylinder parts and is connected to each other by a direction correcting jack so that the front and rear cylinder parts are refractably connected to each other. A tunnel excavator by detachably connecting the front end of the long cylinder of the long motor unit to the rear end of the cylinder of the long cutter unit. When the tunnel excavator is started from the vertical shaft toward the front ground, the cutter head is placed in a short cylinder made of a single cylinder having a shorter length than the long cylinder instead of the motor unit. The short motor unit formed by disposing the drive motor for rotating is configured to form a temporary excavator connected to the cutter unit.

  In the tunnel excavator thus configured, the invention according to claim 2 is such that the drive motor disposed in the long motor unit is an electric motor, while the drive motor disposed in the short motor unit is a hydraulic motor. It is characterized by being.

  The invention according to claim 3 is a tunnel excavation method using the tunnel excavator, wherein a cutter head for excavating the front ground of the cylinder is rotatably supported on a partition wall provided in a front portion of the cylinder. At the rear end of the cutter unit, a short excavator is formed by connecting a short motor unit in which a drive motor for rotationally driving the cutter head is disposed in a short cylinder formed of a single cylinder. After placing in the shaft, the temporary excavator excavates the tunnel from the shaft toward the front ground, excavates the short motor unit before entering the tunnel, and then separates the short motor unit from the cutter unit. A drive mode for rotationally driving the cutter head in a long cylindrical body in which the front and rear cylinder parts are connected to the cutter unit by a direction correcting jack so as to be bent. Configure the tunneling machine by connecting the long motor unit formed by disposing a and performs subsequent tunnel boring by the tunneling machine.

  According to the present invention, as a tunnel excavator for installation in a vertical shaft, a cutter formed by pivotally supporting a cutter head for excavating the front ground of the cylindrical body on a partition wall provided in the front portion of the cylindrical body Using a temporary excavator constructed by connecting a short motor unit in which a drive motor for rotationally driving the cutter head is disposed in a short cylindrical body consisting of a short single cylinder at the rear end of the unit Therefore, the length of the motor unit is extremely short compared to a motor unit equipped with a bending mechanism that is bent between the front and rear cylinders by a direction-correcting jack. As a matter of course, it can be easily assembled on the ground, and on the ground, a cutter unit and a short motor unit are connected to form a temporary excavator, and the temporary excavator can be carried into the vertical shaft. Setting up Work is one that can be performed better efficiency.

  Furthermore, since this temporary excavator starts excavating the tunnel from the vertical shaft toward the front ground and excavates the short motor unit just before entering the tunnel, the short motor unit is separated from the cutter unit. The tunnel length for excavating while the cutter head is driven to rotate by the drive motor is only the length that the cutter unit enters into the ground with a fixed length, so there is no need to correct the direction, etc. Even in a narrow shaft while driving the cutter unit using the unit, the tunnel can be accurately drilled forward by a temporary excavator composed of the cutter unit and the short motor unit.

  In addition, after excavating the short motor unit before entering the tunnel, the short motor unit is separated and removed from the rear end of the cutter unit that has entered the ground. A long motor unit comprising a drive motor for rotationally driving the cutter head in a long cylindrical body formed by connecting the front and rear cylinder parts to each other by a direction correcting jack so that the working area is widened. It is easy to connect the long motor unit to the cutter unit by carrying it into the shaft, and the connection makes it easy to make a long tunnel excavator that can correct the direction during excavation even in a narrow shaft. It can also be used for the construction of curved tunnels.

  According to the invention of claim 2, the drive motor disposed in the long motor unit constituting the tunnel excavator is an electric motor, while the drive motor disposed in the short motor unit constituting the temporary excavator. Since the drive motor is a hydraulic motor, when comparing the lengths of a hydraulic motor and an electric motor having the same output, the hydraulic motor is considerably shorter than the electric motor. By adopting, a short motor unit with a short length can be configured. In this case, since the hydraulic motor does not overload, when there is a locally strong ground, the pressure oil may be relieved and cannot rotate. However, as described above, this hydraulic motor is used as power. Since the tunnel excavation length is a short length that allows the cutter unit to advance from the vertical shaft to the ground by a certain length, there is almost no risk of relief and tunnel excavation can be started.

  On the other hand, since the electric motor can continue the tunnel construction while rotating the cutter head without stopping the rotation even in the region where the high strength ground as described above exists, the tunnel excavator It is suitable as a drive motor. However, the cylinder comprising the front and rear cylinders provided with the electric motor is longer than the cylinder provided with the hydraulic motor. Therefore, the electric motor is disposed in the long cylinder. A tunnel excavator configured by connecting a long motor unit to the motor unit is difficult to directly carry in or install in a shaft with a narrow working space. The excavation is started by a short excavator with a short length motor unit connected to the cutter unit, and the cutter unit is propelled into the ground for a fixed length. Since the long motor unit is replaced, the tunnel can be excavated smoothly from the shaft even in a narrow shaft.

  Next, a specific embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a simplified longitudinal side view of a small diameter tunnel excavator, FIG. 2 is a front view thereof, and the tunnel excavator has an outer diameter of 1 m. A partition wall 2 having an outer peripheral end fixed integrally to the cylinder body 1 by welding or the like is provided in a front portion of a steel tube cylinder body 1 having the following fixed length. A cutter unit A, which is disposed at the front end of the open end and rotatively supports a cutter head 3 for excavating the front ground, and has the same outer diameter as the cylindrical body 1 and a short length which will be described later A long motor unit B comprising a drive motor 12 comprising an electric motor for rotationally driving the cutter head 3 in a long cylindrical body 11 longer than the cylindrical body 21 of the motor unit C; At the rear end of the cylinder 1 of the cutter unit A, this long motor unit B It is constituted by connecting a front end of the elongated tubular body 11.

  The cutter head 3 disposed at the front end of the opening end of the cylindrical body 1 of the cutter unit A is not particularly limited as long as the shape of the bit is suitable for excavation of the ground. A cutter head in which a plurality of tricone bits 3a projecting a large number of excavating blades are provided on the front surface and an excavating earth and sand taking-in opening 3b is provided is adopted. A space between the front surfaces of the isolation wall 2 is formed in the earth and sand taking-in chamber 4. Furthermore, in this earth and sand taking-in chamber 4, the front end surface of the truncated cone-shaped inner cone 5a, which is gradually reduced in diameter toward the front end, is fixed to the center of the rear surface of the cutter head 3, and this inner cone is fixed. The outer peripheral surface of the outer cone 5b, which has been gradually enlarged toward the front end, is fixed to the inner peripheral surface of the front end opening of the cylindrical tube body 1 on the outer peripheral side of 5a, and a cone crusher is formed by the inner cone 5a and the outer cone 5b. Is forming.

  An end face plate 6 with the open end sealed is fixed to the rear end opening of the cylinder 1, and an inner cone 5 a is integrated between the center of the end face plate 6 and the center of the partition wall 2. The rotary shaft 7 of the cutter head 3 fixed to the rotary shaft 7 is supported in a rotatable manner in a erected state, and the rear end portion of the rotary shaft 7 is penetrated rearward from the end face plate 6 so that the drive motor 12 The rotary shaft 13 or the front end of the rotary shaft 23 of the drive motor 22 composed of a hydraulic motor described later is configured to be detachably connected. Further, an air pinch valve 8 is disposed at a lower end portion in a space portion between the partition wall 2 and the end face plate 6, and the front end opening portion of the air pinch valve 8 penetrates the lower end portion of the partition wall 2 in a watertight manner. A mud pipe 14 is provided in the lower end of the long cylindrical body 11 of the motor unit B and communicates with the lower end of the earth and sand taking-in chamber 4 while penetrating the lower end of the end plate 6 at the rear end. The front end is detachably connected and communicated.

  Further, in the space between the partition wall 2 and the end face plate 6, the front end portion penetrates the partition wall 2 in a watertight manner and communicates with the upper portion of the earth and sand intake chamber 4, and the rear end portion passes through the end face plate 6. A mud feed pipe 9 having a predetermined length for connecting the succeeding mud feed pipe 19 is provided, and the front end is also placed in the upper part of the long cylinder 11 of the long motor unit B. The mud feeding pipe 19 is disposed through the front end face plate 16 integrally provided in the front end opening of the eleventh, and is detachably connected to and communicated with the rear end of the mud feeding pipe 9. The rear end portion of the mud pipe 19 is configured to penetrate the rear end face plate 17 provided integrally with the rear end opening of the long cylindrical body 11 and to connect a mud feeding pipe line 30 described later. .

The drive motor 12 is fixed and supported at the center of the rear surface of the front end plate 16 in the long cylinder 11 of the long motor unit B, and the rotating shaft 13 of the drive motor 12 is connected to the center of the end plate 16. Is detachably connected to the rotary shaft 7 of the cutter head 3. Further, the long cylindrical body 11 is divided into front and rear cylindrical body portions 11a and 11b, and the rear end portion of the front cylindrical body portion 11a and the rear cylindrical body portion 11b.
Are connected to each other through a bendable portion 15 so as to be able to bend each other, and a plurality of direction correcting jacks 18 (in the drawing, at predetermined intervals in the circumferential direction) (Only one direction correcting jack is shown) and the front and rear ends of these direction correcting jacks 16 are arranged on the inner peripheral surface of the front cylindrical portion 11a and the inner peripheral surface of the rear cylindrical portion 11b. Each is connected between the protruding brackets.

  Further, the above-described sludge pipe 14 having a length substantially equal to the length of the long cylinder 11 is disposed in the lower end portion of the long cylinder 11, and the rear of the sludge pipe 14 is disposed. The end is supported in a penetrating manner on the lower end portion of the rear end face plate 17 so that the front end of the mud discharge pipe 32 is connected to and communicated with the rear end. Note that the front end face plate 16 of the long cylindrical body 11 is connected to the outer peripheral end portion of the end face plate 6 by a bolt 20 at the outer peripheral end portion joined to the end face plate 6 of the cylindrical body 1 of the cutter unit A.

  When a tunnel excavator constructed as described above excavates a tunnel from the shaft 31 into the ground, the tunnel excavator is a relatively long cylinder formed by connecting the front and rear body portions 11a and 11b so as to be capable of excavation. 11 is formed by connecting a motor unit B having a drive motor 12 composed of an electric motor longer than a hydraulic motor to the cutter unit A. When the cross-sectional area of the shaft 31 is small, the tunnel excavation is performed. When the machine cannot be carried into the shaft from the ground, or even if it can be carried, a situation occurs in which it is difficult to dig from the shaft 31 to the ground in front.

  For this reason, when carrying into the shaft, the long motor unit B is separated from the cutter unit A, and instead of the long motor unit B, as shown in FIG. A short motor unit C comprising a drive motor 22 consisting of a hydraulic motor shorter in length than an electric motor in a short cylinder 21 consisting of a single cylinder shorter in length than the B long cylinder 11 is adopted. By connecting the short motor unit C to the cutter unit A, a temporary excavator that is shorter in length than the tunnel excavator and can be carried into the shaft 31 is configured.

  The short cylinder 21 of the short motor unit C has the same outer diameter as the long cylinder 11 of the long motor unit B, and an end face plate 25 is fixed to the front end opening thereof. The front outer peripheral end is joined to the rear outer peripheral end of the end plate 6 of the cylinder 1 of the cutter unit A, and is attached and detached by the bolt 20 in the same manner as the connecting structure of the cylinder 1 and the long cylindrical body 11 described above. Connected freely. A drive motor 22 consisting of the hydraulic motor is fixed and supported at the center of the rear surface of the end face plate 25, and the rotary shaft 23 of the drive motor 22 passes through the center of the end face plate 25 so that the cutter head 3 The rotary shaft 7 is detachably connected.

  Further, a sludge pipe 24 having substantially the same length as that of the short cylindrical body 21 is disposed in the lower end portion of the short cylindrical body 21, and the front end opening thereof penetrates the lower end portion of the end face plate 25 so as to cut the cutter unit A. The air pinch valve 8 is detachably connected to and communicated with the rear end port portion of the air pinch valve 8 and a mud feed pipe 26 having substantially the same length as the short cylindrical body 11 is disposed in the upper portion, and the front end portion thereof is an end plate. The front end of the mud pipe 9 is detachably connected to and communicated with the rear end of the mud pipe 9 disposed in the cutter unit A.

  The temporary excavator constructed by connecting the short motor unit C to the cutter unit A in this manner is suspended and carried into the shaft 31 by a crane or the like, and is arranged on the inner bottom of the shaft 31 as shown in FIG. It is installed on the starting stand 40 that is installed, facing the front ground. A temporary excavator is configured by carrying the cutter unit A and the short motor unit C separately from the ground into the shaft 31 and connecting the short motor unit C to the rear end of the cutter unit A in the shaft 31. Also good.

  As shown in FIGS. 10 and 11, the start frame 40 has support frames 41 and 41 laid parallel to each other on both sides of the inner bottom surface of the shaft 31 in the front-rear direction and opposed to the support frames 41 and 41. The inner side surfaces are integrally connected by several connecting frames 42, and the cylindrical body 1 of the cutter unit A of the temporary excavator and the short motor unit C are oriented in the front-rear direction at the center between the support frames 41, 41. A horizontal start table 43 that slidably supports the lower peripheral surface of the short cylindrical body 21 is provided, and the horizontal start table 43 is bolted to the upper surface of the central part of the connecting frames 42, 42 orthogonal to the horizontal start table 43. It is fixed by etc.

  Further, a pair of left and right propulsion jacks 44, 44 are disposed on the support frames 41, 41 on both sides of the temporary excavator, and the telescopic rods project toward the rear of the propulsion jacks 44, 44. 44a and 44a are received by a reaction force receiving base 45 fixed on the rear wall surface of the shaft 31, and the cylinder portions 44b and 44b of these propulsion jacks 44 and 44 that advance according to the extension of the rods 44a and 44a are pushed. The holes 46a, 46a drilled in both end portions of the plate 46, the holes 46a, 46a are locked to the rear end flanges 44b ', 44b' of the cylinder portions 44b, 44b, and The central portion of the front surface of the push plate 46 is pressed against the rear end surface of the short cylindrical body 21 of the short motor unit C in the temporary excavator installed on the horizontal start platform 43. A through hole 47 is provided in the center of the push plate 46, and adapters 33 and 34 are connected to the rear ends of the feed and discharge mud pipes 24 and 26 through the through hole 47, and the feed and discharge mud pipes are connected to the adapters 33 and 34. The front ends of the paths 30 and 32 are connected. Further, as the propulsion jacks 44, 44, a two-stage jack is adopted.

  Thus, after installing the temporary excavator on the starting frame 40 and operating the pair of left and right propulsion jacks 44, 44 to extend the rods 44a, 44a, the propulsion jack 44 with the reaction force cradle 45 as a fulcrum , 44 cylinder parts 44b, 44b move forward, and a push plate 46 connected in a erected state between these cylinder parts 44b, 44b moves forward integrally, and a short length of the short motor unit C of the temporary excavator is formed in front of it. The temporary excavator is propelled toward the start pit 48 on the horizontal start platform 43 while pressing the rear end surface of the cylindrical body 21, and excavation of the front ground is started from the start pit 48.

  The excavation of the ground is driven by driving a drive motor 22 consisting of a hydraulic motor in the short motor unit C to transmit the rotation to the rotating shaft 7 of the cutter head 3 and propel the temporary excavator while rotating the cutter head 3. The excavated earth and sand are taken into the earth and sand taking-in chamber 4. At this time, when the large block soil is taken into the earth and sand taking-in chamber 4, it is finely crushed by the inner cone 5a and the outer cone 5b.

  Further, during excavation, the mud is supplied from the ground through the mud pipe 30 to the mud pipe 26 in the short motor unit C, and connected to and communicates with the mud pipe 26 through the mud pipe 9 in the cutter unit A. Muddy water is supplied to and filled with the earth and sand intake chamber 4 and mixed with the excavated earth and sand, and the excavated earth and sand are mud. While the ground is excavated by the cutter head 3 while being prevented, the mud that has become mud in the earth taking-in chamber 4 is sent to the mud pipe 24 in the short motor unit C through the air pinch valve 8, and the mud pipe line The muddy water is fed to the separation tank (not shown) installed on the ground from the shaft 31 together with the muddy water through 32, and after the excavated sediment is separated from the muddy water in this separation tank, the muddy water is supplied to the muddy pipe 30 again. The mud pressure in the earth and sand taking-in chamber 4 is adjusted by adjusting the opening degree of the air pinch valve 8.

  In this way, the excavation of the tunnel is started from the vertical shaft toward the front ground by the temporary excavator until the connection portion between the cutter unit A and the short motor unit C enters the tunnel, that is, until just before entering the start pit 48. When excavated, the excavation of the tunnel is stopped at that position, the mud pipe 9 in the cylinder 1 of the cutter unit A and the mud pipes 24 and 26 are disconnected from the pinch valve 8 and the cylinder 1 of the cutter unit A is released. After the end face plate 25 of the short cylindrical body 21 of the short motor unit C is disconnected from the end face plate 6, the short motor unit C is retracted to move the rotary shaft 23 of the hydraulic motor 22 relative to the rotary shaft 7 of the cutter head 3. And the short motor unit C is disconnected from the cutter unit A, and the short motor unit C is removed to the ground side by a crane or the like and collected (FIG. 5). Irradiation).

  Next, a long motor unit B including a drive motor 12 made of an electric motor, a direction correcting jack 18, a feed mud pipe 14, 19 and the like is suspended by a crane or the like and carried into the shaft 31, and a starting stand 40 After being installed above, the rods 44a, 44a of the pair of left and right propulsion jacks 44, 44 are extended so that the rear end face of the long motor unit B is advanced through the push plate 46, and the long cylinder 11 The front end face plate 16 is joined to the rear end end face plate 6 of the cutter unit A and connected together by a bolt 20 as shown in FIG. 1 and the rotary shaft 13 of the drive motor 12 is connected to the rotary shaft of the cutter head 3. 7 is connected to and connected to the mud pipe 9 and the pinch valve 8 in the cylinder 1 of the cutter unit A, respectively, and to these mud pipes 14 and 19. Connect the front ends of the sludge pipes 30 and 32. Moreover, the drive motor 12 which consists of an electric motor is connected to the generator 50 installed on the ground via wiring (refer FIG. 6).

  In this way, after connecting the long motor unit B to the rear end of the cutter unit A, the pair of left and right propulsion jacks 44, 44 are operated to extend the rods 44a, 44a. As a fulcrum, the motor unit B is propelled through the push plate 46, and the drive motor 12 in the long motor unit B is driven to rotate the cutter head 3, thereby digging the tunnel. As described above, the excavated earth and sand is taken into the earth and sand taking-in chamber 4 and finely crushed by the inner cone 5a and the outer cone 5b, and then discharged through the pinch valve 8, the mud pipe 14 and the mud pipe line 32. .

  Once the long cylindrical body 11 of the long motor unit B following the cutter unit A is dug until just before entering the start pit 48, the tunnel excavation is stopped once and the rods 44a of the pair of left and right propulsion jacks 44, 44, By contracting 44a, the push plate 46 is moved backward so that a space in which the tube P having a certain length can be interposed between the rear end of the long cylindrical body of the long motor unit B and the push plate 46 is provided. First, the outer diameter of the tubular body P is substantially the same as that of the long cylindrical body 11, and the hydraulic unit for operating hydraulic equipment such as the direction correcting jack 18 and the control panel, the target for determining the excavation direction, etc. Is connected to the long motor unit B. At this time, the feed / drain mud lines 30 and 32 are also connected to the feed / drain mud pipes 14 and 19 in the long motor unit B through the first control pipe P1 (see FIG. 7).

  After that, the drive motor 12 is operated to rotate the cutter head 3 and the propulsion jacks 44, 44 are operated to extend the rods 44a, 44a, whereby the rear end face of the first control pipe P1 is moved by the push plate 46. The first control pipe P1 is pushed forward to advance the cutter unit A and the long motor unit B together, and the cutter unit A digs a tunnel. When a tunnel having a fixed length corresponding to the length of the first control pipe P1 is excavated, as shown in FIG. 8, the first control pipe P1 is provided with a lubricant inlet, a bypass valve, and the like. After the second control pipe P2 is followed, the second control pipe P2 is grounded integrally with the first control pipe P1 while digging through a tunnel having a fixed length corresponding to the length of the second control pipe P2. Promote inside.

  Subsequently, as shown in FIG. 9, following this second control pipe P2, an embedded pipe P3 such as a fume pipe having a certain diameter and a slightly smaller diameter than the first and second control pipes P1 and P2 is used as the pipe body P. The rear end is pushed through the push plate 46 by the propulsion jacks 44 and 44 in the same manner as described above and propelled into the tunnel excavated by the tunnel excavator. Then, every time a tunnel of a certain length corresponding to one buried pipe P3 is excavated, the tunnel reaches the reaching side shaft (not shown) from the vertical shaft 31 by propelling it while sequentially adding the buried pipe P3. A pipe line such as a sewage pipe composed of a buried pipe P3 row is formed over the entire length of The cutter unit A, the long motor unit B, and the control pipes P1 and P2 are sequentially separated and removed to the ground side when they reach the reaching shaft.

  In the above embodiment, as the cutter head 3 for excavating the ground in front of the cutter unit A, a structure in which a plurality of tricone bits 3a are protruded on the front surface is adopted. As shown in FIG. 12, a plurality of spokes 3c are provided radially from the center of the rotating shaft 3 toward the outer diameter direction, and an earth and sand intake opening is provided between adjacent spokes 3c and 3c, and at the front of each spoke. A normal cutter head 3 ′ provided with a plurality of cutter bits 3a ′ may be used. Further, as the drive motor for driving the cutter head 3, the long motor unit B uses an electric motor and the short motor unit C uses a hydraulic motor, but the same drive motor may be used.

A simplified longitudinal side view of a tunnel excavator. The front view. The simplified longitudinal section side view of a temporary excavator. The simplified side view of the state where the preparation for excavation of the front ground was completed from the inside of the shaft. The simplified side view of the state which removes a short motor unit. The simplified side view of the state which connected the long motor unit to the cutter unit. The simplified side view of the state which connected the 1st control pipe to the long motor unit. The simplified side view of the state which connected the 2nd control pipe. The simplified side view of the state which made the buried pipe follow. The top view of a starting stand. The rear view. The simplified vertical side view of the cutter unit provided with the cutter head of another structure.

Explanation of symbols

A Cutter unit 1 Cylinder 2 Bulkhead 3 Cutter head 7 Rotating shaft B Long motor unit
11 Long cylinder
12 Electric motor
13 Rotating shaft C Short motor unit
21 Short cylinder
22 Hydraulic motor
23 Rotation axis
31 shaft
40 Starting stand

Claims (3)

  A cutter unit in which a cutter head for excavating the front ground is rotatably supported by a partition wall provided in the front part of the cylindrical body, and a jack for correcting the direction between the front and rear cylindrical parts divided into the front and rear cylindrical parts. And a long motor unit in which a drive motor for rotationally driving the cutter head is disposed in a long cylindrical body connected to each other in a refractive manner, and the front end of the long cylindrical body of the long motor unit is A tunnel excavator is configured by detachably connecting to the rear end of the cylinder of the cutter unit, and when the tunnel excavator is started from the vertical shaft toward the front ground, the long motor unit is replaced. A short motor unit in which a drive motor for rotationally driving the cutter head is disposed in a short cylindrical body having a single cylinder shorter in length than the long cylindrical body. Tunneling machine, characterized by being configured to form a temporary excavator connected.   The tunnel excavator according to claim 1, wherein the drive motor disposed in the long motor unit is an electric motor, while the drive motor disposed in the short motor unit is a hydraulic motor.   At the rear end of the cutter unit, which pivotally supports the cutter head for excavating the front ground of the cylinder in the partition wall provided in the front part of the cylinder, the cutter head is rotated into a short cylinder consisting of a single cylinder. A temporary excavator is formed by connecting a short motor unit provided with a driving motor to be driven, and the temporary excavator is disposed in the shaft, and then tunneled from the shaft to the front ground by the temporary excavator. After excavating the short motor unit before entering the tunnel, the short motor unit is separated from the cutter unit, and the front and rear cylinder parts are connected to the cutter unit with a direction correcting jack so as to be refractably connected to each other. A tunnel excavator is constructed by connecting a long motor unit in which a drive motor for rotating the cutter head is disposed in the long cylindrical body. Tunneling method is characterized by performing the subsequent tunnel excavation by the tunneling machine.

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