JP4599530B2 - Dividing structure of excavator and method for retracting excavator - Google Patents

Description

  The present invention relates to a division structure of an excavator and a retracting method of the excavator, and more particularly to a technique for recovering an excavator that has built a pit.

The excavator for excavating a tunnel or the like in the ground is often not recovered even after the completion of excavation when it is deep like an underwater tunnel, while in a relatively shallow tunnel in an urban area, The excavator can be recovered and reused.
In particular, recently, when constructing a large-section tunnel, a method of constructing a plurality of rectangular small-section tunnels and finally forming a large-section tunnel is being adopted. It is necessary to construct, and recovery of the excavator is essential.

For this reason, various methods for collecting the excavator have been devised in the past. For example, in a tunnel constructed by configuring an excavator with an outer trunk and an inner trunk and detaching the inner trunk from the outer trunk after excavation. (See Patent Document 1, etc.), and a shaft is provided at the entrance and exit of the tunnel. After excavation, all or part of the excavator is temporarily lifted from the shaft on the exit side and transferred to the ground. There is known a method for returning to (see Patent Document 2).
JP 2001-317285 A JP 2002-188391 A

However, although the technique disclosed in Patent Document 1 can effectively use the constructed tunnel, there is a problem that only a part of the excavator can be recovered by such a method.
Further, in the technique disclosed in Patent Document 2, all or part of the excavator is temporarily lifted and transferred to the ground, and the small-section tunnel is repeatedly constructed below the road, particularly in urban areas. In such a case, it is not preferable because there is a problem that the ground transportation is obstructed frequently for a long time for transferring the excavator.

  The present invention has been made to solve such problems, and the object of the present invention is to use the constructed mine effectively to pull the entire excavator back to the starting position and to easily reuse the excavator. It is an object of the present invention to provide a possible excavator division structure and a method of retracting the excavator.

In order to achieve the above-described object, the division structure of the excavator according to claim 1 includes a main cutter, a main cutter drive unit, and a sub-cutter so that the excavator has a longitudinal dimension smaller than a built-in pit width dimension. The front cutter unit and the rear tail unit that controls the excavation direction of the excavator are detachably divided in the front-rear direction, and the vertical and vertical dimensions of the cutter unit and the cutter unit and the The tail unit is detachably divided in the vertical direction .

The divided structure of the excavator of claim 2, in claim 1, wherein Sabukatta are disposed around the main cutter drive unit for the cutter unit is detachably dividing said main cutter in the vertical direction In addition, the main cutter driving unit and a part of the sub cutter are detachably divided in the vertical direction.
In the division structure of the excavator according to claim 3 , in claim 1 or 2 , the tail unit includes a plurality of direction control jacks, and all of the plurality of direction control jacks are located on one side of the tail unit. As described above, it is characterized in that it is detachable in the vertical direction.

According to a fourth aspect of the present invention, there is provided a method for retracting the excavator , wherein the main cutter, the main cutter driving unit, and the sub cutter are arranged so that the front and rear dimensions are smaller than the inner pit width of the constructed mine after the mine is constructed by the excavator. the the front of the cutter unit and the rear of the tail unit for controlling the excavation direction of the shield machine with split dismantled in the longitudinal direction consisting of, as the vertical dimension is less than the downhole vertical dimension of pit described above constructs, the cutter unit and The tail unit is divided and disassembled in the vertical direction, and each part of the excavating machine divided and disassembled is changed to a direction in which it can pass through the constructed mine, and the inside of the mine is pulled back to the start position.

The retraction method of tunneling machine according to claim 5, in claim 4, wherein Sabukatta are disposed around the main cutter drive unit for the cutter unit is detachably dividing said main cutter in the vertical direction In addition, the main cutter driving unit and a part of the sub cutter are divided and disassembled in the vertical direction.
In the retracting method for an excavator according to claim 6 , in claim 4 or 5 , the tail unit includes a plurality of the direction control jacks, and all of the plurality of direction control jacks are located on one side of the tail unit. As described above, it is divided into pieces in the vertical direction.

According to a seventh aspect of the present invention, there is provided a method for retracting the excavator according to any one of the fourth to sixth aspects, wherein a rail for pulling is laid in the constructed mine, and at least a part of the divided and dismantled cutter unit and tail unit. The rail wheel is temporarily attached, and the wheel rolls on the rail to pull back at least one part of the divided and disassembled cutter unit and tail unit to a starting position.

According to the division structure of the excavator according to claim 1, the front cutter unit and the rear portion including the main cutter, the main cutter drive unit, and the sub cutter are arranged so that the front and rear dimensions are smaller than the inner pit width dimension of the constructed mine. The tail unit was detachably divided in the front-rear direction, and the cutter unit and tail unit were each detachably separated in the vertical direction so that the vertical dimension was smaller than the vertical dimension of the built pit. Later, it can be easily dismantled into a portion having a size smaller than the opening size of the well where the excavator was constructed while minimizing the number of divisions , It can be pulled back to the starting position. As a result, it is possible to easily pull back all of the excavator to the starting position by effectively using the constructed mine without requiring ground space, and the excavator can be easily reused, thereby significantly reducing the construction cost. be able to.

According to the division structure of the excavator of claim 2 , the cutter unit is configured such that the main cutter is detachably divided in the vertical direction, and the main cutter driving unit and a part of the sub cutter are detachably divided in the vertical direction. Therefore, the main cutter driving unit can be recovered in one piece without being subdivided, and the excavator can be easily reassembled.
According to the division structure of the excavator of claim 3 , since the tail unit is detachably divided in the vertical direction so that all of the plurality of direction control jacks are located on one side, the plurality of direction control jacks are It can be collected in one piece without being subdivided, and the excavator can be easily reassembled while maintaining the accuracy of direction control.

According to the retracting method of the excavator according to claim 4 , after the pit is constructed by the excavator, the front portion including the main cutter, the main cutter drive unit, and the sub-cutter so that the front-rear dimension is smaller than the in-hole width dimension of the constructed mine. The cutter unit and the tail unit of the rear part are divided and disassembled in the front-rear direction, and the cutter unit and tail unit are divided and disassembled in the vertical direction so that the vertical dimension is smaller than the vertical dimension of the built pit. Since each part of the machine was changed to the direction that it can pass through the built mine, and the inside of the mine was pulled back to the starting position, after the mine was built, the opening of the mine where the excavator was built while minimizing the number of divisions It can be easily disassembled into parts smaller than the dimensions, and all the parts of the dismantled excavator will pass through the constructed mine to the starting position and interfere with the mine wall. It can be pulled back clause. This eliminates the need for ground space, makes it possible to easily pull back all the excavator to the starting position by effectively using the constructed mine, and allows the excavator to be easily reused, thereby significantly reducing construction costs. be able to.

According to the retracting method of the excavator of claim 5 , with respect to the cutter unit, the main cutter is detachably divided in the vertical direction, and the main cutter driving part and a part of the sub cutter are divided and disassembled in the vertical direction. As a result, the main cutter drive unit can be recovered in one piece without being subdivided, and the excavator can be easily reassembled.
According to the retracting method of the excavator of claim 6 , since the tail unit is divided and disassembled in the vertical direction so that all of the plurality of direction control jacks are located on one side, the plurality of direction control jacks are provided. Can be collected without subdividing, and the excavator can be easily reassembled while maintaining the accuracy of direction control.

According to the retracting method of the excavator of claim 7 , the rail for pulling is laid in the constructed pit, and the rail wheel is temporarily attached to at least one part of the cutter unit and the tail unit that are divided and disassembled. The wheel is rolled on the rail so that at least one part of the cutter unit and the tail unit divided and disassembled is pulled back to the start position, so that each part of the divided and dismantled excavator is pulled back to the start position very easily. be able to.

In particular, when constructing a plurality of the above-mentioned small-section tunnels, it is preferable to provide a rail only at one location of the first constructed mine and to repeatedly use the rail, thereby making the parts of the excavator divided and disassembled efficient. It can be pulled back to the starting position well.
In the above, the excavator is preferably configured such that the main cutter and the sub cutter can construct a pit having a special cross section (rectangular, elliptical, horseshoe-shaped, etc.). When the excavator has such a special cross section, it is easy to set the division unit of the excavator relatively appropriately as compared with a normal circular cross section.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a longitudinal sectional view of an excavator applied to the divided structure of the excavator and the retracting method of the excavator according to the present invention (the hatching indicating the member cross section is omitted, the same applies hereinafter), and FIG. The front view of the excavator seen from the arrow A direction is shown.
As shown in FIGS. 1 and 2, the excavator 1 is a propulsion type excavator used when constructing a plurality of small-section tunnels in order to construct a large-section tunnel as described above. It is configured to be able to excavate the tunnel.

The digging machine 1 is mainly composed of a cutter unit 2 located at the front, a tail unit 4 located at the rear, and a screw conveyor unit 6.
First, the cutter unit 2 will be described. The cutter unit 2 includes a swing cutter (main cutter) 10, a swing cutter driving unit (main cutter driving unit) 20, and a sub cutter 30.

The swing cutter 10 is configured by fixing a plurality of cutter bits 14 for cutting earth and stone to the front surface of a substantially elliptic cutter frame 12, and a swing shaft 16 is provided at the center of the cutter frame 12. The swing shaft 16 is swingably supported by the bearing portion 22 of the swing cutter driving unit 20.
In the oscillating cutter driving unit 20, a balance-like arm 24 extends from the oscillating shaft 16 in a direction perpendicular to the oscillating shaft 16, and the oscillating shaft 16 and thus the oscillating cutter 10 are oscillated through the arm 24. A pair of rocking jacks 26, 26 to be moved are connected. The pair of swing jacks 26 and 26 are, for example, hydraulic cylinders, and can swing the swing cutter 10 by extending and contracting each other.

Around the swing cutter driving unit 20, corner cutters 32 are provided at the four corners of the cutter unit 2 as one of the sub cutters 30. The corner cutter 32 is a cutter for cutting the corner stone that cannot be completely cut by the swing cutter 10, and is configured to rotate the cutter bit 34 by the motor 36.
Further, the outer shell of the cutter unit 2 is made of a steel material having high hardness, and thereby, a fixed cutter 38 is constituted as one of the sub cutters 30. The fixed cutter 38 scrapes off the remaining earth and stone that could not be cut by the swing cutter 10 and the corner cutter 32, and finally a rectangular tunnel is formed.

That is, the sub cutter 30 (the corner cutter 32 and the fixed cutter 38) is provided so as to surround the periphery of the swing cutter driving unit 20.
Next, the tail unit 4 will be described. The tail unit 4 is configured by connecting a front tail 40 and a rear tail 42 by a plurality of directional control jacks 44. Specifically, the plurality of directional control jacks 44 are hydraulic cylinders, for example, and are arranged at equal intervals in the vicinity of the outer periphery of the tail unit 4. Accordingly, the front tail 40 and the rear tail 42 can be angled by appropriately expanding and contracting the plurality of direction control jacks 44, and the traveling direction of the excavator 1 can be controlled.

A seal member 46 is interposed between the front tail 40 and the rear tail 42 over the entire circumference so as to prevent debris from entering the excavator 1 from the outside.
In addition, although the case where the tail unit 4 is provided with a plurality of direction control jacks 44 is shown here, the direction control jack 44 is not particularly necessary when it is not necessary to bend the traveling direction of the excavator 1.

The screw conveyor unit 6 is a device that rotates the shaft screw 50 by the motor 52 and carries the debris cut by the cutter unit 2 to the outside.
The code | symbol 54 in FIG. 1 is a pressure feed pump for pressure-feeding debris, and is connected with the screw conveyor unit 6 as needed.
Moreover, the code | symbol 60 in FIG. 1 has shown the segment inserted in the tunnel cut with the excavator 1 while pressing the excavator 1 with the propulsion apparatus 130 mentioned later.

In the excavator 1 configured as described above, the upper portion 10b of the swing cutter 10 is divided from the main body 10a, and is fastened to the main body 10a by a plurality of bolts and nuts (not shown).
Further, a part of the upper side of the sub cutter 30 above the swing cutter driving unit 20 and the upper part of the front tail 40 of the tail unit 4 are integrated to form an upper part 30b, and the upper part 30b is the swing cutter. The drive unit 20 and the main body (side and lower portions of the sub-cutter 30) 30a and the main body 40a of the front tail 40 are divided, and a plurality of bolts and nuts 70 are fastened to the swinging cutter drive unit 20, the main body 30a, and the main body 40a. Has been.

Similarly, the upper part 42 b of the rear tail 42 is divided from the main body 42 a and is fastened to the main body 42 a by a plurality of bolts and nuts 72.
The main body 30a of the swing cutter driving section 20 and the sub cutter 30 and the main body 40a of the front tail 40 are fastened by a plurality of bolts and nuts 74, and the screw conveyor holding section in which the screw conveyor unit 6 is provided integrally with the sub cutter 30. 39 is fastened with a bolt nut 76.

  That is, as shown in FIGS. 3 and 4 in exploded views corresponding to FIGS. 1 and 2, respectively, the excavator 1 has the upper part 10b of the swing cutter 10 detachable from the main body 10a. The upper portion 30b including a part of the upper side of the sub cutter 30 and the upper portion of the front tail 40 is detachable from the swinging cutter driving unit 20, the main body 30a, and the main body 40a, and the upper portion 42b of the rear tail 42 is detachable from the main body 42a. It is free. Then, the main body 10a of the swinging cutter 10, the main body 30a of the swinging cutter driving unit 20 and the sub cutter 30, that is, the cutter unit main body 2a, the main body 40a of the front tail 40, and the main body 42a of the rear tail 42, that is, the tail unit main body 4a. Are detachable in the front-rear direction, and the screw conveyor unit 6 is detachable.

  Specifically, the tail unit 4 is divided so that all of the plurality of directional control jacks 44 are located on the main body 40a of the front tail 40 and the main body 42a side of the rear tail 42, that is, on the tail unit main body 4a side. The sealing member 46 is interposed between the main body 40a and the main body 42a. That is, the tail unit 4 is configured such that the direction can be controlled only by the tail unit body 4a.

  As shown in FIGS. 3 and 4, the cutter unit main body 2a and the tail unit main body 4a are set so that the maximum height H is smaller than the vertical dimension of the segment 60 (the vertical dimension in the mine). The depth D1 of the cutter unit main body 2a and the depth D2 of the tail unit main body 4a are set so as to be smaller than the inner dimension in the width direction of the segment 60 (downhole width dimension).

Hereinafter, the pulling-back method according to the present invention of the excavator 1 configured as described above will be described.
The excavator 1 is employed, for example, in a construction method in which a plurality of small-section tunnels are constructed to finally form a large-section tunnel.
FIG. 5 shows the construction method in which the excavator 1 is excavated and the segment 60 is inserted to construct one tunnel 100, and then the excavator 1 is disassembled, and the disassembled excavator 1 portion is set to the start position. It is the longitudinal cross-sectional view of the tunnel 100 which showed a mode that it returned to. FIG. 6 is a front view of the tunnel 100 as viewed from the direction of arrow B in FIG.

  As shown in FIGS. 5 and 6, the vertical shaft 110 on the start position side and the vertical shaft 120 on the arrival position side are cut open before and after the tunnel 100, respectively. The working plates 112 and 122 are disposed in the shafts 110 and 120, respectively, and the propulsion device 130 that presses and propels the excavator 1 and the segment 60 is disposed in the shaft 110 on the start position side. The openings of the shafts 110 and 120 are closed with lids 114 and 124, respectively.

  As shown in FIGS. 5 and 6, when the excavator 1 completes excavation, the excavator 1 is first disassembled on the plate 122 in the shaft 120 on the arrival position side. At this time, as shown in FIGS. 3 and 4, the bolt nut (not shown) is removed to detach the upper portion 10b of the swinging cutter 10 from the main body 10a, and the bolt nut 70 is removed to remove the upper portion of the sub cutter 30. The upper part 30b including the upper part and the upper part of the front tail 40 is detached from the swinging cutter driving unit 20, the main body 30a, and the main body 40a, and the bolts and nuts 72 are removed to remove the upper part 42b of the rear tail 42 from the main body 42a. . Further, the bolt nut 74 is removed from the cutter unit main body 2a including the main body 10a of the swing cutter 10, the swing cutter driving unit 20 and the main body 30a of the sub cutter 30, the main body 40a of the front tail 40, and the main body 42a of the rear tail 42. The tail unit body 4a is detached in the front-rear direction. Then, the bolt nut 76 is removed and the screw conveyor unit 6 is detached. In FIG. 5, the cutter unit main body 2a and the tail unit main body 4a, which are large parts of the dismantled parts, are shown as representatives.

  When the excavator 1 is disassembled in this way, the disassembled parts are pulled back through the tunnel 100 to the shaft 110 on the start position side. For example, the relatively small portions, that is, the upper portion 10b, the upper portion 30b, the upper portion 42b, and the screw conveyor unit 6 are returned first, and then the cutter unit main body 2a and the tail unit main body 4a, which are large portions, are returned.

At this time, since the cutter unit main body 2a and the tail unit main body 4a are set so that the maximum height H is smaller than the inner dimension in the vertical direction of the segment 60 (upper and lower dimension) as described above, The upper parts of the unit main body 2 a and the tail unit main body 4 a do not interfere with the ceiling of the segment 60 in the tunnel 100.
Further, as described above, the cutter unit main body 2a and the tail unit main body 4a are such that the depth D1 of the cutter unit main body 2a and the depth D2 of the tail unit main body 4a are larger than the inner dimension in the width direction of the segment 60 (downhole width dimension). Since the cutter unit main body 2a and the tail unit main body 4a are rotated by 90 °, they can be prevented from interfering with the side walls of the segment 60 in the tunnel 100.

Therefore, the cutter unit main body 2a and the tail unit main body 4a are rotated by 90 ° on the plate 122, and the tunnel 100 is pulled back in such a posture rotated by 90 °.
Incidentally, since the cutter unit main body 2a and the tail unit main body 4a are heavy, it is difficult to carry them as they are. In addition, the floor surface of the segment 60 may be a smooth surface, but is not actually a smooth surface in many cases.

Therefore, a pair of rails (C-shaped steel, etc.) 140 and 140 are laid in the central portion of the floor surface of the segment 60 in the longitudinal direction of the tunnel 100, and FIG. As shown, a plurality of rollers (wheels) 142 are temporarily attached to the lower surfaces of the cutter unit main body 2a and the tail unit main body 4a in accordance with the shapes of the rails 140 and 140.
Accordingly, the cutter unit main body 2a and the tail unit main body 4a can be pulled back to the shaft 110 on the start position side by rolling the roller 142 on the rails 140 and 140.

In addition, if the trolley | bogie suitable for the rails 140 and 140 is used, the upper part 10b, the upper part 30b, the upper part 42b, and the screw conveyor unit 6 can also be pulled back using the said trolley | bogie.
When the upper part 10b, the upper part 30b, the upper part 42b, the screw conveyor unit 6, the cutter unit main body 2a and the tail unit main body 4a are pulled back to the shaft 110 on the starting position side, the excavator 1 is reassembled on the plate 112, and the next tunnel 101 Start drilling. Thereafter, the above operation is repeated until the construction of the tunnels 102 to 105 is completed.

  Here, the rails 140 and 140 are laid only in one place of the tunnel 100, and the upper part 10b, the upper part 30b, the upper part 42b, the screw conveyor unit 6, the cutter unit main body 2a and the tail unit main body 4a are pulled back. 140 is repeatedly used to perform all using the tunnel 100. The rails 140 and 140 may be collected after use, or may be left as they are and embedded in concrete.

  Thus, according to the division structure of the excavator and the retracting method of the excavator according to the present invention, the upper part 10b of the swinging cutter 10 is detachably divided from the main body 10a, and the upper part and the front part of the sub cutter 30 are separated. The upper part 30b including the upper part of the tail 40 is detachably divided from the swinging cutter drive unit 20, the main body 30a, and the main body 40a, and the upper part 42b of the rear tail 42 is detachably split from the main body 42a. 10 a main body 10a, a swinging cutter drive unit 20 and a main body 30a of the sub-cutter 30 and a tail unit main body 4a including a main body 40a of the front tail 40 and a main body 42a of the rear tail 42 in the front-rear direction. Since it is possible to divide freely, and this allows division dismantling to a size that can pass through the tunnel 100 in which the excavator 1 is constructed, the number of divisions The excavator 1 can be easily disassembled after excavation while minimizing it, and the parts of the disassembled excavator 1 can be pulled back to the shaft 110 on the start position through the tunnel 100 without interference with the segment 60. Can do.

Thereby, it is not necessary to carry out the excavator 1 to the ground until construction is completed, and no ground space is required, and the tunnel 100 that is constructed is effectively used to make the entire excavator 1 the vertical shaft 110 on the start position side. The excavator 1 can be easily reused, and the construction cost can be greatly reduced.
At this time, with respect to the cutter unit 2, the upper part of the sub-cutter 30 and the swinging cutter driving unit 20 are divided in the vertical direction, so that the swinging cutter driving unit 20 is integrated without being subdivided. The excavator 1 can be easily reassembled.

  The tail unit 4 is divided so that all of the plurality of directional control jacks 44 are located on the main body 40a side of the front tail 40 and the main body 42a side of the rear tail 42, that is, on the tail unit main body 4a side. Is interposed between the main body 40a and the main body 42a, the plurality of direction control jacks 44 can be integrally recovered without being subdivided, and the excavator 1 can be easily reassembled. Further, by not separating the plurality of direction control jacks 44, the accuracy of the direction control can always be maintained constant.

  Further, the pull-back rails 140 and 140 are laid in the constructed tunnel 100, and a plurality of rollers 142 for the rail 140 are temporarily attached to at least the cutter unit main body 2a and the tail unit main body 4a, respectively. Since the cutter unit main body 2a, the tail unit main body 4a and the like are pulled back on the rails 140, 140, the parts of the divided excavator 1 can be very easily reached to the vertical shaft 110 on the start position side. Can be pulled back.

At this time, by laying the rails 140 and 140 only in the tunnel 100 and repeatedly using the rails 140 and 140, each part of the divided excavator 1 can be efficiently pulled back to the shaft 110 on the start position side. .
Although the description of the embodiment according to the present invention is finished above, the embodiment is not limited to the above, and various modifications can be made without departing from the spirit of the invention.

  For example, in the above embodiment, the excavator 1 capable of excavating a tunnel having a rectangular cross section has been described as an example. However, the present invention can be applied to an excavator capable of excavating a tunnel having any cross section. However, in an excavator capable of excavating a tunnel with a special cross section (rectangular, elliptical, horseshoe-shaped, etc.), the advantage is that it is easier to set the division unit relatively appropriately than an excavator with a normal circular cross section due to its shape characteristics. Therefore, the present invention can exhibit particularly high effects in an excavator capable of excavating the tunnel having the special cross section.

  Moreover, although the propulsion-type excavator 1 has been described as an example in the above embodiment, the present invention is not limited to this, and the present invention can be similarly applied to a shield excavator.

It is a longitudinal cross-sectional view of the excavator applied to the division structure of the excavator and the retracting method of the excavator according to the present invention. It is a front view of the excavator seen from the arrow A direction of FIG. It is an exploded view of the excavator corresponding to FIG. FIG. 3 is an exploded view of the excavator corresponding to FIG. 2. It is the longitudinal cross-sectional view of the tunnel which showed a mode that the excavation machine was dismantled and the part of the excavation machine disassembled was returned to the start position. It is the front view of the tunnel seen from the arrow B direction of FIG. It is a figure which expands and shows the C section of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Excavator 2 Cutter unit 2a Cutter unit main body 4 Tail unit 4a Tail unit main body 6 Screw conveyor unit 10 Oscillation cutter (main cutter)
10a body 10b upper part 20 swing cutter drive unit (main cutter drive unit)
30 Sub cutter 30a Main body 30b Upper part 32 Corner cutter 38 Fixed cutter 40 Front tail 40a Main body 42 Rear tail 42a Main body 42b Upper part 44 Direction control jack 46 Seal member 60 Segment 100 Tunnel 110, 120 Shaft 130 Propulsion device 140 Rail 142 Roller (wheel)

Claims (7)

A front cutter unit including a main cutter, a main cutter drive unit, and a sub cutter, and a rear tail unit that controls the excavation direction of the excavator so that the front and rear dimensions of the excavator are smaller than the inner pit width dimension of the constructed mine. An excavator characterized in that the cutter unit and the tail unit are detachably divided in the vertical direction so that the vertical dimension is smaller than the vertical dimension of the constructed pit in the vertical direction while being detachable in the longitudinal direction. Split structure. The sub cutter is disposed around the main cutter driving unit,
For said cutter unit, characterized in that the addition to detachably split the main cutter vertically and detachably split a part of the said main cutter drive portion Sabukatta in the vertical direction, according to claim 1 Divided structure of the described excavator. The tail unit includes a plurality of directional control jacks,
The division structure of the excavator according to claim 1 or 2 , wherein the tail unit is detachable in the vertical direction so that all of the plurality of directional control jacks are located on one side. After constructing the pit with the excavator, the excavator is connected to the front cutter unit including the main cutter, the main cutter drive unit, and the sub cutter, and the excavator so that the longitudinal dimension is smaller than the in-hole width dimension of the constructed mine . a rear tail unit for controlling the excavation direction with dividing dismantled in the longitudinal direction, so that the vertical dimension is less than the downhole vertical dimension of pit described above constructs, split dismantling the cutter unit and the tail unit in the vertical direction, A retracting method for an excavating machine, wherein each part of the divided excavating machine is changed to a direction in which it can pass through the constructed underground tunnel, and the interior of the tunnel is pulled back to a starting position. The sub cutter is disposed around the main cutter driving unit,
For said cutter unit is configured to divide detachably said main cutter in the vertical direction, and wherein the dividing dismantling a portion of the said main cutter drive portion Sabukatta in the vertical direction, according to claim 4, wherein How to retract the machine. The tail unit includes a plurality of the direction control jacks,
The retracting method for an excavator according to claim 4 or 5 , wherein the tail unit is divided and disassembled in the vertical direction so that all of the plurality of directional control jacks are located on one side. While laying a rail for pulling back in the constructed mine, and temporarily attaching the rail wheel to at least one part of the divided and disassembled cutter unit and tail unit,
7. The retractor of the excavator according to any one of claims 4 to 6 , characterized in that the wheel is rolled on the rail to pull back at least one part of the divided and disassembled cutter unit and tail unit to a start position. Method.

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