JP2000073687A - Diameter-enlarging shield excavation machine and its formation - Google Patents

Abstract

PROBLEM TO BE SOLVED: To excavate a large diameter tunnel following a small diameter tunnel by fimly fixing peripheral blocks divided into four parts of the upper and lower sides and the right and left sides to the outer periphery of a small diameter tunnel excavation machine in an arrival shaft and forming a large diameter tunnel excavation machine. SOLUTION: A small diameter tunnel excavation machine M which has excavated a small diameter tunnel is pushed out to an arrival shaft and front shell skin plates 25 divided into four parts of the upper and lower sides and the right and left sides are firmly fixed to the outer periphery of the front shell skin plate 1 of the excavation machine M. Then, the hood of the excavation machine M and the rear shell skin plate are removed and the rear shell block 24 is connected and further, a cutter disk block 26 is fitted to the outer periphery of a small diameter cutter disk Dm to form a large diameter disk cutter Dn and form a large diameter tunnel excavation machine N. In this time, a shield jack 16 is shifted and a mud removal pipe 30 is newly laid, and bending jacks 9, an erector 17, and a circularity holder 18 are adjusted for respective strokes and used for the excavation machine N in common. Accordingly, the large diameter tunnel following the small diameter tunnel can be excavated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a large-diameter shield excavator for excavating a large-diameter tunnel following excavation of a small-diameter tunnel, and a method of forming the same.

[0002]

2. Description of the Related Art A shield excavator is used as a means for forming a tunnel underground. In recent years, tunnel construction for burying sewerage, electricity, telephone lines, and the like in urban maintenance and the like has been rapidly increasing. As such tunnel construction, there is a demand to form tunnels having different diameters such as forming a small-diameter so-called branch pipe on the upstream side and forming a large-diameter so-called main pipe on the downstream side as in sewerage work, for example.
In the case of forming such a tunnel, a construction method is adopted in which a shaft is provided at the junction where the tunnel diameters are different, and tunnels of each diameter are excavated from these shafts by different shield excavators having different diameters and connected at the shaft position. ing. However, this method requires a great deal of cost and time to set up a shaft at each junction. In addition, in an urban area, an existing building or building may not be able to provide a shaft.

Therefore, a two-stage shield machine which does not require a shaft at the junction has been developed. In such a shield excavator, a small shield excavator is provided concentrically in a large shield excavator, and a large-diameter tunnel is excavated to a predetermined position by an integrated large-diameter shield excavator. It is configured to excavate a small diameter tunnel by excavating only the machine.

[0004] As a conventional technique for performing the large diameter excavation, there is also an invention described in Japanese Patent Application Laid-Open No. Hei 4-31595.
In the present invention, an overcutter is provided to perform large-diameter excavation.

[0005]

However, in the case of the two-stage shield excavator described above, after excavating a large diameter tunnel with a large diameter shield excavator, a small diameter shield excavator is excavated to excavate a small diameter tunnel. Can be used only in the direction in which the shield machine is excavated.

Therefore, if the starting shaft of the large-diameter shield excavator cannot be provided on the planned route of the tunnel, the two-stage shield excavator cannot cope with the problem. This is the same in construction where it is difficult to excavate from a large-diameter tunnel, and it is not possible to cope with construction in which the excavation diameter is increased.

In such a case, the small-diameter tunnel and the large-diameter tunnel are excavated by different shield excavators as described above. In this case, the shield excavator at the middle shaft position is replaced. In addition to the increase in time and equipment cost for performing the work and manufacturing a plurality of shield excavators, the cost increases due to duplication of assembly and disassembly.

[0008] Further, in the technique of expanding the diameter by the above-mentioned over cutter, the excavation efficiency is low, and the construction period is delayed and the construction cost is increased.

[0009]

SUMMARY OF THE INVENTION To solve the above-mentioned problems, the invention according to the present application provides a cutter in which a cutter disk of a small-diameter shield excavator is provided at a position where the cutter disk of a large-diameter shield excavator can be supported. Supported by drums,
This cutter drum is configured to be driven by a drive device capable of rotating a cutter disk of a large-diameter shield excavator.

[0010] Thus, even when the diameter of a small-diameter shield excavator that excavates a small-diameter tunnel is expanded to a large-diameter shield excavator that excavates a large-diameter tunnel, the cutter disk can be stably supported, and the same driving machine can be used. The cutter disk can be driven. An electric motor or the like having a capacity capable of excavating the ground with a cutter disk in a state in which the large-diameter shield excavator is formed is used as a drive machine capable of turning the large-diameter shield excavator. As a result, the large-diameter tunnel can be excavated subsequent to the excavation of the small-diameter tunnel, so that a construction that does not require a shaft at the arrival position of the large-diameter shield excavator can be performed. Also, equipment costs can be reduced.

The small-diameter shield excavator is provided with a mud pipe and a mud pipe, and the mud pipe is provided at a lower portion of the small-diameter shield body, and a cutter disk is provided so as to face a front opening of the mud pipe. If a stirring member is provided, the earth and sand in the chamber can be agitated without the need for an agitator when excavating a small diameter tunnel, and the earth and sand in the center of the chamber can be effectively agitated when excavating a large diameter tunnel.

Further, if the hood covering the chamber at the front end of the shield body is formed of a plate material continuous with the skin plate, the hood can be easily removed when changing from a small-diameter shield excavator to a large-diameter shield excavator. .

On the other hand, the method of forming the enlarged diameter shield machine is as follows.
The lower block of the large-diameter shield excavator is provided in the arrival shaft of the small-diameter shield excavator, the small-diameter shield excavator is excavated and reached on the lower block, the shield jack is removed from the small-diameter shield excavator, and the hood is removed. A large diameter shield machine is provided around the small shield machine above, and a large diameter shield machine is provided around the cutter disk of the small shield machine to form an enlarged shield machine. . By forming the large-diameter shield excavator in this way, the small-diameter shield excavator can be effectively used.

If the shield jack removed from the small-diameter shield excavator is attached to a large-diameter shield excavator to form a large-diameter shield excavator, the shield jack can be reused to reduce equipment costs.

Further, a lower block of the large-diameter shield excavator is provided in the reaching shaft of the small-diameter shield excavator, the small-diameter shield excavator is excavated and reached on the lower block, and the shield jack is removed from the small-diameter shield excavator. Remove the hood of the shield excavator and the rear trunk, provide a block around the small diameter shield excavator on the lower block, around the large diameter shield excavator, and attach the shield jack removed from the small diameter shield excavator to the large diameter shield excavator. Attaching to the excavator, installing a large-diameter shield excavator cutter disk around the small-diameter shield excavator cutter disk, and installing a rear trunk at the rear of the large-diameter shield excavator to form a large-diameter shield excavator. The change from the excavator to the large-diameter shield excavator can be performed efficiently.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the invention according to the present application will be described below with reference to the drawings. FIG. 1 is a cross-sectional side view of a small-diameter shield excavator showing an embodiment of the invention according to this application.

As shown in the figure, the small-diameter shield excavator M of this embodiment has a small-diameter cutter disk Dm at the front of the small-diameter shield body 1.
m is a cutter drum 2 provided at the front of the shield body 1
Supported by The cutter drum 2 supports a large-diameter cutter disc Dn (FIG. 12) in a state changed to a large-diameter shield excavator N (FIG. 12) to be described later, and is provided at a position close to the outer periphery so as to be driven. . This position is determined by the diameter of the large-diameter cutter disk Dn and the properties of the excavated ground. In this embodiment, the large-diameter cutter disk Dn is provided so as to be located substantially at the center in the radial direction, so that a reaction force can be received when excavating a large-diameter tunnel.

The base 2a of the cutter drum 2 is connected to a turning bearing 3 provided in the shield body 1, and the turning bearing 3 is driven to turn by a gear 5 provided in a drive unit 4. As the drive unit 4, a drive unit capable of turning a large-diameter cutter disk Dn of a large-diameter shield excavator N to be described later is employed. For example, a motor with a reduction gear having a large load capacity is employed.

The small-diameter shield machine M has a middle bent portion 6 in the middle of the shield body 1, and the front body 7 and the rear body 8 are connected by a middle bent jack 9.
A hood 1a that covers the chamber 10 is provided at a front portion of the front body 7, and the hood 1a is formed of a cylindrical plate material that is continuous with a skin plate 7a of the front body 7 that is a part of the shield body 1. ing. Further, a tail seal 8b is provided on the skin plate 8a of the rear trunk 8 to seal between the tail S and the segment S.

At the front of the shield body 1, a mud pipe 11 and a mud pipe 12 are provided at the rear of the cutter disk Dm and open to a chamber 10 for taking in earth and sand.
Is provided near the upper end of the shield body 1, and the sludge pipe 12 is provided near the lower end of the shield body 1. The drain pipe 12 is provided with a branch pipe 13 for connecting the drain pipe when the diameter is expanded to a large-diameter shield excavator N described later. 1
Reference numeral 4 denotes an on-off valve for opening and closing each pipe.

A stirring member 15 is provided on the small-diameter cutter disk Dm on the side of the chamber 10 so as to sandwich the cutter drum 2.
And is configured to stir the earth and sand in the chamber 10 when excavating the small-diameter tunnel Tm. By providing the agitating member 15 so as to face the front opening of the sludge pipe 12, sediment does not stay at the front part of the sludge pipe 12.

The rear body 8 has a plurality of shield jacks 1.
6 are provided so that the segment S can be dug by taking a reaction force. After this, the torso 8
An erector device 17 for assembling the segment S is provided, and is turned by a turning motor 17a. Behind the elector device 17, a perfect circle holding device 18 is provided.
Is provided. The perfect circle holding device 18 may be provided depending on the surrounding geology and the like. In this embodiment, a backing material is injected between the segment S and the ground G simultaneously with excavation by a simultaneous backfilling device (not shown). Therefore, the backing material is provided to maintain a perfect circle while the backing material is hardened. Reference numeral 19 denotes an inspection port for an operator to enter and exit the chamber 10 from the shield body 1.

According to the small-diameter shield excavating machine M configured as described above, the small-diameter cutter disc Dm is turned by the driving machine 4 and excavated by the shield jack 16.
Excavation of ground G with cutter disc Dm and small diameter tunnel T
m can be excavated. Then, if the segment S is assembled by the erector device 17 provided behind the shield main body 1 and a perfect circle is kept for a predetermined time by the perfect circle holding device 18, a small-diameter tunnel covered with the segment S can be formed.

2 to 10 are drawings showing the process of expanding the diameter from the small-diameter shield excavator of FIG. 1 to the large-diameter shield excavator. FIG. 2 is a diagram showing the initial process, and (a) is a side view. (B) is a rear view. 3 is a drawing showing the next step of FIG. 2, (a) is a sectional view in a side view, (b) is a rear view, FIG. 4 is a drawing showing the next step in FIG. 3, and (a) is a side view. Sectional view,
(b) is a rear view, and FIG. 5 is a drawing showing the next step of FIG.
FIG. 6B is a cross-sectional view in a side view, FIG. 6B is a rear view, FIG. 6 is a drawing showing the next step of FIG. 5, (a) is a cross-sectional view in a side view, (b) is a rear view,
7 is a drawing showing the next step of FIG. 6, (a) is a sectional view in a side view, (b) is a rear view, and FIG. 8 is a drawing showing the next step of FIG.
(a) is a front view, (b) is a cross-sectional view in a side view, FIG. 9 is a drawing showing the next step of FIG. 8, (a) is a cross-sectional view in a side view, (b) is a rear view, and FIG. 10A and 10B are drawings showing the next step of FIG. 9, in which FIG. Based on these figures,
The process of forming a large-diameter shield machine by expanding the small-diameter shield machine M will be described.

As shown in FIGS. 2A and 2B, a small-diameter shield excavator M excavating the small-diameter tunnel Tm is excavated in the reaching shaft H and extruded. This arrival shaft H is a small diameter tunnel T
It is also an intermediate shaft located between m and the large diameter tunnel Tn. At a predetermined position in the reaching shaft H, a cradle 20 is provided.
The lower block 21 of the large-diameter shield machine N (FIG. 12) mounted on the cradle 20 is provided. Fig. 2 (b)
The black circles shown in FIG. 4 indicate the mounting portions of the shield jack 16, and the white circles indicate the non-mounting portions.

As shown in FIGS. 3A and 3B, the small-diameter shield excavator M is excavated, and the small-diameter shield excavator M is placed on the lower block 21 of the large-diameter shield excavator mounted on the cradle 20. Extruder M is extruded. At this time, the axial position of the small-diameter shield machine M and the lower block 21 (for example, “bulk head”
Position).

As shown in FIGS. 4A and 4B, the shield jack 16 is removed from the small-diameter shield machine M mounted on the lower block 21 of the large-diameter shield machine.

As shown in FIGS. 5A and 5B, the hood 1a covering the chamber 10 of the small-diameter shield machine M is removed, and the skin plate 8a of the rear trunk 8 is removed.

As shown in FIGS. 6A and 6B, the left and right blocks 22 and the upper block 23, which are peripheral blocks of the large-diameter shield machine, are assembled around the small-diameter shield machine M. At this time, the axial positions (for example, the “bulkhead” position) of all the blocks 21, 22, and 23 and the small-diameter shield machine M are aligned.

As shown in FIGS. 7A and 7B, the rear trunk block 24a of the rear trunk 24 of the large-diameter shield excavator N is retracted toward the front trunk 25, and a large-diameter shield excavator M is mounted on the outer surface of the small-diameter shield excavator M. The blocks 21, 22, 23 of the shield machine N are fixed.
The fixing method is not limited, but any means may be used as long as the means can be swiveled integrally, and means such as welding and bolting can be used.

As shown in FIGS. 8A and 8B, the cutter disk block 26 for the large-diameter shield machine N is fixed to the outer periphery of the small-diameter cutter disk Dm of the small-diameter shield machine M.

As shown in FIGS. 9A and 9B, the skin plate 24b of the rear trunk 24 is mounted on the rear trunk block 24a of the large diameter shield machine N. The shield jack 16 is also attached to the shield jack non-attached portion 27 between the blocks 21, 22, 23 of the large diameter shield machine N.

As shown in FIGS. 10A and 10B, each block 21 of the large-diameter shield excavator N is mounted on the outer surface of the small-diameter shield excavator M excavating the small-diameter tunnel Tm (FIG. 2A). 2
2 and 23 are assembled to form a large-diameter shield excavator N capable of excavating a large-diameter tunnel Tn (FIG. 2A).

FIG. 11 is a front view of a large-diameter shield excavator obtained by expanding the small-diameter shield excavator shown in FIG. 1, FIG. 12 is a sectional view of the large-diameter shield excavator in a side view, and FIG. It is a rear view of a diameter shield machine. The same components as those of the small-diameter shield machine M are denoted by the same reference numerals, and description thereof will be omitted.

As shown in FIG. 12, the large-diameter shield excavator N formed by the above-described method includes a large-diameter shield body 28.
A large-diameter cutter disk Dn is provided at the front of the small-diameter shield body 1, and the entire large-diameter cutter disk Dn is supported by a cutter drum 2 provided near the outer periphery of the small-diameter shield main body 1. This large-diameter cutter disk Dn is
Is turned by a driving device 4 that turns the.

The large-diameter shield excavator N also has a middle bent portion 29.
The front trunk 25 and the rear trunk 24 are connected to each other by the middle bending jack 9 provided in the small-diameter shield excavator M. The large-diameter shield main body 28 is bent by the middle folding jack 9. The rear trunk 24 is provided with a plurality of shield jacks 16.

As the mud pipe 11 opened to the chamber 10, the mud pipe 11 of the small diameter shield machine M is used. The sludge pipe 12 is an extended sludge pipe 3 connected to a branch pipe 13 of the sludge pipe 12 provided on the small-diameter shield machine M.
0 is provided near the lower end of the shield body 28. When connecting this exhaust pipe 30, the exhaust pipe 12 for the small-diameter shield machine is closed by the on-off valve 14. As shown in FIG. 11, agitators 31 are provided on both sides of the exhaust pipe 30 in the chamber 10 where the exhaust pipe 30 is opened.
Is provided, and is configured to stir mud in the chamber 10.

As the erector device 17 provided on the rear trunk 24, the erector device 17 of the small-diameter shield excavator M is used. It is configured so that it can be assembled.

As shown in FIG. 13, the perfect circle holding device 18 provided behind the elector device 17 also has an enlarged segment holding inner diameter of the perfect circle holding device 18 used in the small diameter shield excavator M. The stroke is increased as much as possible.

According to the large-diameter shield excavating machine N configured as described above, the large-diameter tunnel Tn can be excavated by turning the large-diameter cutter disk Dn by the driving machine 4 and excavating from the shaft H. it can.

Therefore, the small diameter tunnel Tm shown in FIG.
Figure 1 shows the effective use of the small-diameter shield machine M excavated
Since the large tunnel Tn having a large diameter shown in FIG. 2 can be continuously excavated, one shield excavator is effectively used to excavate continuously from the small tunnel Tm to the large tunnel Tn, thereby reducing equipment costs. Tunnel construction can be performed.

In the above embodiment, the configuration example in which the large-diameter shield excavator N is divided into four parts has been described. However, the number of divisions of the large-diameter shield excavator N can be set arbitrarily. May be set according to the diameter of the shaft, the size of the shaft H, and the like.

Furthermore, the above-described embodiment is one embodiment, and various changes are possible without departing from the gist of the invention according to this application. The invention according to this application is limited to the above-described embodiment. Not something.

[0044]

The invention according to this application is implemented in the form described above, and has the following effects.

Since the large-diameter tunnel can be excavated by changing the small-diameter shield excavator excavating the small-diameter tunnel to the large-diameter shield excavator, tunnels having different diameters can be reduced by effectively using one shield excavator. It is possible to excavate from the side to the large diameter side.

[Brief description of the drawings]

FIG. 1 is a side view sectional view of a small-diameter shield machine showing an embodiment of the invention according to this application.

2A and 2B are drawings showing an initial step of expanding the diameter from the small-diameter shield excavator to the large-diameter shield excavator in FIG. 1, wherein FIG. 2A is a cross-sectional view in a side view, and FIG.

3A and 3B are drawings showing the next step of FIG. 2, wherein FIG. 3A is a cross-sectional view as viewed from the side, and FIG. 3B is a rear view.

4A and 4B are drawings showing the next step of FIG. 3, wherein FIG. 4A is a cross-sectional view as viewed from the side, and FIG.

5A and 5B are drawings showing the next step of FIG. 4, in which FIG. 5A is a cross-sectional view in a side view, and FIG. 5B is a rear view.

6A and 6B are drawings showing the next step of FIG. 5, wherein FIG. 6A is a cross-sectional view in a side view, and FIG. 6B is a rear view.

7A and 7B are drawings showing the next step of FIG. 6, wherein FIG. 7A is a cross-sectional view as viewed from the side, and FIG.

8 is a drawing showing the next step of FIG. 7, (a) is a front view,
(b) is a sectional view in a side view.

9A and 9B are drawings showing the next step of FIG. 8, wherein FIG. 9A is a cross-sectional view in a side view, and FIG. 9B is a rear view.

10A and 10B are drawings showing the next step of FIG. 9, wherein FIG. 10A is a cross-sectional view as viewed from the side, and FIG. 10B is a rear view.

11 is a front view of a large-diameter shield excavator obtained by expanding the small-diameter shield excavator shown in FIG.

12 is a cross-sectional view of the large-diameter shield machine shown in FIG. 11 when viewed from the side.

FIG. 13 is a rear view of the large-diameter shield machine shown in FIG. 11;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Small-diameter shield body 1a ... Hood 2 ... Cutter drum 2a ... Base 3 ... Slewing bearing 4 ... Driving machine 5 ... Gear 6 ... Middle bent part 7 ... Front trunk 7a ... Skin plate 8 ... Rear trunk 8a ... Skin plate 8b ... Tail Seal 9: middle bent jack 10: chamber 11: mud pipe 12 ... mud pipe 13 ... branch pipe 14 ... open / close valve 15 ... stirring member 16 ... shield jack 17 ... elector device 18 ... perfect circle holding device 20 ... pedestal 21 ... lower block 22 ... left and right blocks 23 ... upper block 24 ... rear trunk 24a ... rear trunk block 24b ... skin plate 25 ... front trunk 26 ... cutter disk block 28 ... large diameter shield body 29 ... middle bent part 30 ... extended drainage pipe 31 ... Agitator G ... Soil H ... Arriving shaft S ... Segment Tm ... Small diameter tunnel Tn ... Large diameter tunnel Dm ... Small diameter cutter Disk Dn ... large-diameter cutter disk M ... small-diameter shield machine N ... large-diameter shield machine

[Procedure amendment]

[Submission date] August 5, 1999 (1999.8.5)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0009

[Correction method] Change

[Correction contents]

[0009]

SUMMARY OF THE INVENTION To solve the above-mentioned problems, the invention according to the present application provides a cutter in which a cutter disk of a small-diameter shield excavator is provided at a position where the cutter disk of a large-diameter shield excavator can be supported. Supported by drums,
Configure this cutter drum so as to drive the driving motor that can turn driving the cutter discs of large diameter shield machine, this
A mud pipe and a mud pipe are installed in the small-diameter shield excavator of
A drain pipe is provided below the small-diameter shield body,
Agitate the cutter disc so that it faces the front opening of the mud pipe
A member is provided .

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0010

[Correction method] Change

[Correction contents]

[0010] Thus, even when the diameter of a small-diameter shield excavator that excavates a small-diameter tunnel is expanded to a large-diameter shield excavator that excavates a large-diameter tunnel, the cutter disk can be stably supported, and the same driving machine can be used. The cutter disk can be driven. An electric motor or the like having a capacity capable of excavating the ground with a cutter disk in a state in which the large-diameter shield excavator is formed is used as a drive machine capable of turning the large-diameter shield excavator. Further , since the large-diameter tunnel can be excavated following the excavation of the small-diameter tunnel, a construction that does not require a shaft at the arrival position of the large-diameter shield excavator can be performed. Furthermore , equipment costs can be reduced.
In addition, an agitator is required when excavating small diameter tunnels
Without excavating the soil in the chamber when excavating large diameter tunnels
Can effectively stir the earth and sand in the center of the chamber
it can.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0011

[Correction method] Deleted

Continued on the front page (72) Inventor Makoto Sato 1-3-1 Higashikawasakicho, Chuo-ku, Kobe-shi, Hyogo Kawasaki Heavy Industries, Ltd. Kobe Head Office F-term (Reference) 2D054 AC05 AD07 BA03 BA07 BA07 EA01 EA07

Claims (6)

[Claims] 1. A large-diameter shield excavator for enlarging and excavating a small-diameter shield excavator for excavating a small-diameter tunnel to a large-diameter shield excavator for excavating a large-diameter tunnel, wherein a cutter of the small-diameter shield excavator is provided. The disk is supported by a cutter drum provided at a position where the cutter disk of the large-diameter shield machine can be supported, and the cutter drum is driven by a driving machine capable of rotating the cutter disk of the large-diameter shield machine. A large diameter shield machine. 2. A small diameter shield excavator having a mud feed pipe and a drain pipe provided at a lower portion of a small diameter shield main body, and a cutter disk provided so as to face a front opening of the drain pipe. 2. The machine according to claim 1, further comprising a stirring member. 3. The machine according to claim 1, wherein the hood for covering the chamber at the front end of the shield body is formed of a plate material continuous with the skin plate. 4. A lower block of a large-diameter shield excavator is provided in an arrival shaft of a small-diameter shield excavator, a small-diameter shield excavator is excavated and reached on the lower block, a shield jack is removed from the small-diameter shield excavator, and a hood is removed. Removing, providing a peripheral block of the large-diameter shield excavator around the small-diameter shield excavator on the lower block, and providing a cutter disk of the large-diameter shield excavator around the cutter disk of the small-diameter shield excavator. A method for forming a large-diameter shield excavator, comprising: 5. The method according to claim 4, wherein the shield jack removed from the small-diameter shield excavator is attached to the large-diameter shield excavator to form a large-diameter shield excavator. 6. A lower block of a large-diameter shield excavator is provided in an arrival shaft of a small-diameter shield excavator, a small-diameter shield excavator is excavated and reached on the lower block, and a shield jack is removed from the small-diameter shield excavator. Remove the hood of the shield excavator and the rear trunk, provide a block around the small diameter shield excavator on the lower block, around the large diameter shield excavator, and attach the shield jack removed from the small diameter shield excavator to the large diameter shield excavator. Attached to the excavator, the cutter disk of the large-diameter shield excavator was installed around the cutter disk of the small-diameter shield excavator, and the rear trunk was provided at the rear of the large-diameter shield excavator to form an enlarged-diameter shield excavator. Method of forming a large diameter shield machine.