JP3447116B2 - Double-body shield excavator and its simultaneous excavation method. - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The invention of this application relates to a shield machine used in a shield construction method for constructing tunnels and the like, and a simultaneous excavation method therefor. The present invention relates to a double-barreled shield excavator capable of performing simultaneously and a simultaneous excavation method.

[0002]

2. Description of the Related Art Conventionally, a shield machine has been used as a machine for forming tunnels, subway lines, etc. underground such as rocks and roads. The shield construction method using this shield machine, for example, using a double-barreled shield machine composed of a front body and a rear body,
While excavating the ground with a cutter disk provided with a cutter bit on the front side, the front trunk side jack (hereinafter referred to as the slide jack) and the rear trunk side reaction force receiving jack (hereinafter referred to as the shield jack) are provided. By communicating and expanding and contracting, the front cylinder and the rear cylinder are slid to advance, and the excavation for one segment width of one segment (for example, 1200 mm) is performed by one excavation. Then, after the shield excavation work, a new segment is assembled for one ring while the excavation work is temporarily stopped, and when this assembly work is completed, the excavation reaction force is applied to this segment to perform the new excavation work. There is.

Therefore, this shield method requires a lot of time because the excavation work and the segment assembly work are performed separately.

On the other hand, in recent years, it has become difficult to secure a site for shield work in urban areas and its suburbs, and even if secured, long-term use becomes difficult. . By constructing a tunnel similar to the conventional one in a short period of time by high-speed excavation, the company is trying to reduce the construction period and the construction cost by shortening the construction period.

As a conventional technique of this kind, Japanese Patent Publication No. 3-23
There is an invention described in Japanese Patent No. 720, and the invention described in this publication is a method of operating a shield machine, which aims to improve the speed of excavation by simultaneously performing segment assembly and excavation. This operation method starts from the initial state where the slide jacks are contracted and all the shield jacks are extended, and the extension of the slide jacks propels the front frame to excavate the face, while a part of the shield jacks When a new segment piece is installed by an erector in the gap formed by contracting the existing segment with the existing segment, a reaction force is applied to the piece, and then this operation is repeated for other shield jacks in sequence to form a ring-shaped segment. After assembling, make the push jack pressure chambers of the slide jack and shield jack communicate with each other.
The pressure is applied to the pull-side pressure chamber of the shield jack to return these jacks to the initial state.

However, in this operating method, since one ring of the segment is made to communicate with the slide jack provided on the front body side and the shield jack provided on the rear body side to dig in one stroke, both jacks are used. Since the stroke for one ring or more is required, the length of the shield machine becomes long, and a large shaft is required to bring the shield machine into the ground, ensuring a large site and forming a shaft. A lot of costs are required for the above.

Further, in this prior art, since both jacks are communicated with each other, it is difficult to correct meandering and the like, and it is difficult to perform curving excavation by providing a center folding mechanism because both jacks are communicated with each other. It is difficult to perform curved excavation by the operation method of the shield machine.

In view of the above problems, the invention of this application is
One purpose is to provide a shield machine that enables high-speed construction that performs both excavation work and segment assembly work at the same time, and that can also make the shield machine length compact, and provides a simultaneous excavation method using the shield machine. Another object of the present invention is to provide a simultaneous excavation method in which meandering correction is easy in the simultaneous excavation method.

[0009]

In order to achieve the above object, a double-barrel shield machine according to claim 1 has a front body having a cutter disk on the front side and a rear body having an erector device for assembling segments on the rear side. In a double-barrel type shield excavator in which a body and a body are slidably connected to each other, a plurality of slide jacks having a stroke of approximately half the segment width are provided between the front body and the rear body, and the rear body is provided with the slide jacks. A plurality of shield jacks having substantially the same stroke as the sum of the segment width, the stroke of the slide jack, and the segment built-in gap are provided, and a control device for separately expanding and contracting the shield jack and the slide jack is provided. It is characterized by being driven.

According to a method for simultaneously excavating a double-barrel type shield machine according to a second aspect, the front body and the rear body are axially slidably connected to each other, and a plurality of slide jacks are provided on the front body side and the rear body In the simultaneous excavation method with a double-barreled shield machine equipped with multiple shield jacks on the trunk side, (a)
From the state that there is a predetermined gap between the shield jack and the existing segment, the first step of making the first excavation of the front body with the slide jack at less than about half of the segment width and above the segment built-in gap, (b) by the shield jack A second step in which the rear body is advanced by the same amount as the first step and the slide jack is contracted by the same amount in the same amount, (c) The shield jack and the front body are secondly advanced by the shield body and the shield jack and the existing segment are formed. A third step of forming a gap in which the segment width and the segment built-in gap are combined, and
Along with the process and the third process, the segment width is excavated at about half or less of the segment width so that the segment width is obtained, and a part of the shield jack is contracted to assemble a new segment in the gap. Step (e) The rear body is dug by the same amount as the fourth step by the slide jack and the shield jack, and
The fifth step of shrinking a part of the shield jack other than the step and assembling a new segment in the gap, (f) The forward trunk is dug by the same amount as the first step of the first step by the slide jack. Process, (g) 7th process of assembling the key segment by stopping the slide jack, and (b) to (g) 2nd to 7th processes are sequentially repeated to perform excavation work and segment assembly work. And is performed at the same time.

The simultaneous excavation method using the double-barreled shield excavator according to claim 3 is the simultaneous excavation method according to claim 2, wherein the extension amount of the plurality of shield jacks is adjusted in the third step. It is characterized in that the direction control is performed.

According to a fourth aspect of the present invention, in the simultaneous excavation method using a double-barrel type shield excavator, in the simultaneous excavation method of the second aspect, a center folding mechanism is provided on the rear trunk side to adjust the extension amounts of a plurality of shield jacks. Thus, the bending operation is performed while the direction of the shield machine is controlled by the center folding mechanism.

[0013]

According to the double-body shield machine according to the first aspect, the slide jack provided between the front body and the rear body has a stroke of about half the segment width, and the shield jack provided on the rear body. Has substantially the same stroke as the sum of the segment width, the stroke of the slide jack and the segment mounting gap, the front body having a cutter disk on the front side and the erector device for assembling the segments on the rear side. It is possible to shorten the length of the double-barrel type shield excavator in which the rear body is slidably connected in the axial direction, and furthermore, the shield jack and the slide jack can be separately controlled for expansion and contraction. Simultaneous excavation method that performs segment assembly work at the same time is possible.

According to the method for simultaneously excavating the double-barreled shield machine according to claims 2 to 4, the front body and the rear body are axially slidably connected to each other, and a plurality of slide jacks are provided on the front body side. In the first step, a double-jacket type shield excavator equipped with a plurality of shield jacks on the rear torso side is used to move the front torso from the state in which there is a predetermined gap between the shield jack and the existing segment in the first step. The first is the half of the width of the segment or less and the gap above the segment
In the second step, the rear jack is advanced by the shield jack in the second step by the same amount as the first step, and the slide jack is shortened by the same amount in the second step. 2 By excavating, a gap is formed between the shield jack and the existing segment, which is the sum of the segment width and the segment built-in gap. In the fourth step, the front body is combined with the first step and the third step by the slide jack. So that the width of the segment is less than half of the width of the segment so that the space above the segment can be dug in, and some of the shield jacks are shrunk to assemble a new segment in the gap. The rear body is dug by the jack by the same amount as the fourth step, and a part of the shield other than the fourth step is shielded. Shrink the jack and assemble a new segment in the gap, and in the sixth step, use the slide jack to advance the front trunk by the same amount as the first advance in the first step, and in the seventh step, slide the jack. If the key segment is stopped and the key segment is assembled, the excavation work by the shield excavator and the segment assembly work can be performed at the same time, and the simultaneous excavation method can be performed by sequentially repeating the second to seventh steps.

Particularly, according to the simultaneous excavation method according to the third aspect, the direction of the shield machine can be controlled by adjusting the extension amounts of the plurality of shield jacks in the third step.

Further, according to the simultaneous excavation method according to claim 4, in the third step, by adjusting the extension amounts of the plurality of shield jacks, the center folding mechanism provided on the rear trunk side of the shield excavator is used. It is possible to perform bending work while controlling the direction.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the invention according to this application will be described below with reference to the drawings. FIG. 1 is a drawing showing an initial state of the simultaneous excavation method, (a) is a sectional view of a shield machine, and (b) is a side view showing a gap between a segment and a shield jack. In the following examples, segment C
An example in which the width is 1200 mm will be described.

As shown in the figure, the shield machine of the invention according to this application is a double-barrel type shield machine S comprising a front body 2 having a cutter disk 1 on the front surface and an erector device 3 for assembling a segment C on the rear portion. The rear body 4 which it has is connected slidably in the axial direction, and a slide portion 5 is formed between the front body 2 and the rear body 4.

The sliding portion 5 is formed by slidably joining a small-diameter portion 4a provided on the front portion of the rear body 4 and a rear portion of the front body 2, and has a circumferential shape on the front body 2 side. The base end sides of the plurality of slide jacks F provided are supported, and the piston tip portion Fa of the slide jacks F is attached to the ring member 6 on the rear body 4 side.
Are connected, and when the slide jack F is expanded and contracted, the slide portion 5 is configured to be slidable in the axial direction. Further, a plurality of shield jacks R supporting the excavation reaction force by the segments C are provided on the rear body 4 side, and in this embodiment, 14 shield jacks R are provided.
Are circumferentially provided at equal angles, and these are held by a support frame 7 provided on the rear body 4.

The slide jack F and the shield jack R are controlled by a controller (not shown) so that they can be expanded and contracted separately. The expansion / contraction amount of the plurality of slide jacks F is also individually controlled by this control device. The optimum number of these jacks may be selected depending on the shield diameter and the like, and if the number is 3 or more, the extension amount can be adjusted and controlled as described later.

The stroke of the slide jack F provided on the front case 2 is a short stroke of 600 mm stroke, which is half of the segment width, in order to advance the double-body type shield excavator S as will be described later in this embodiment. A double-barreled shield machine S is adopted in which the length of the front body 2 is shortened to make the overall length of the shield machine compact. If the stroke is approximately half the segment width, the simultaneous excavation method can be performed and the machine length can be shortened as described later.

Further, the shield jack R supports the excavation reaction force of the double-barrel shield excavator S during the assembly work of the segment C, as will be described later, and therefore, the segment width, the stroke of the slide jack F and the assembly. A stroke that matches the segment assembly gap h is adopted. In this embodiment, a segment width of 1200 mm, a stroke of the slide jack F of 600 mm, a segment mounting gap of 100 mm, and a stroke of 1950 mm are used considering a margin. It should be noted that if the stroke of the shield jack R is secured more than necessary, the shield excavator length is increased, so the minimum required is preferable.

Further, in this embodiment, a center folding mechanism 8 having a spherical seat 8a is provided at an intermediate portion of the rear body 4, and by providing the center folding mechanism 8, the front rear body 4A and the rear rear body 4A. It is configured to be bendable between 4B and 4B. In addition,
The center folding mechanism 8 and the slide portion 5 are provided with earth and sand seals (not shown) to prevent intrusion of muddy water into the machine.

The state shown in FIGS. 1 (a) and 1 (b) is the initial state. In this state, as shown in FIG. 1 (b), the origin O (when the existing segment C _O and the shield jack R are contracted is Hereinafter, a gap H of 700 mm is provided between the gap H and the origin.

2 (a), (b) to FIG. 8 (a), the simultaneous excavation method using the double-barreled shield excavator S configured as described above is described.
Sectional view of the shield machine in the first to seventh steps of (b) and a side view showing the gap between the segment and the shield jack, and segments in the fourth to seventh steps of FIGS. 9 (a) to (d). The following description is based on the drawings showing the assembled state. The same components as those in FIG. 1 are designated by the same reference numerals and the description thereof will be omitted.

First, as shown in FIG. 2 (a), by extending the slide jack F provided on the front case 2 from the state shown in FIG. 1 (a), one half of 1200 mm which is one ring width of the segment C is extended. The following excavation amount of 400 mm is first excavated. This first excavation is the first step, and since only the front body 2 is excavated in this step, the gap H between the existing segment C _O and the origin O of the shield jack R is shown in FIG. 2 (b).
700mm is the same.

Next, as shown in FIG. 3 (a), the slide jack F is shrunk by 400 mm to move the rear body 4 forward by 400 mm, which is the same amount as the first step, and the shield jack R.
Also extend 400 mm. That is, the rear body 4 is pulled toward the front body 2 by the same amount as the amount of excavation of the front body 2 in the first step. At this time, as shown in FIG. 3 (b), since the rear body 4 is 400mm forward from the existing segment C _O, the gap H between the origin O of the shield jacks R becomes 1100 mm. This step is the second step.

Then, as shown in FIG. 4 (a), the shield jack R allows the gap H between the existing segment C _O and the origin O of the shield jack R to be adjusted to the new segment C together with the amount of excavation in the second step. One ring width of _N is 120
The front body 2 as well as the rear body 4 is set to 200 mm so that a total of 0 mm and 100 mm of the segment assembly gap h is 1300 mm.
mm 2nd dig. This second excavation becomes the third step, and by the first excavation in the first step and this second excavation, the process shown in FIG.
As shown in (b), the gap H between the existing segment C _O and the origin O of the shield jack R is 1300 mm, and there is 1200 between the existing segment C _O and the shield jack R.
A gap H is secured so that a new segment C _N of mm width can be assembled.

Further, in this third step, since the segment C is not assembled but only the double-barrel type shield machine S is excavated, the extension amounts of the plurality of circumferentially arranged shield jacks R are adjusted by the controller. By doing so, it is possible to control the direction of the double-barreled shield machine S, and therefore it is possible to dig while correcting the meandering in the third step.

As described above, since the gap H between the existing segment C _O and the origin O of the shield jack R becomes 1300 mm at the time when the third step is completed, the double-barrel type shield excavator from the fourth step below. As S advances, the assembly work of the new segment C _N will be performed at the same time. That is, in the invention according to this application, the assembling work of this new segment C _N can be performed simultaneously with the excavation work as follows.

That is, as shown in FIG. 5 (a), while the front body 2 is being excavated by the slide jack F by 600 mm which is half the width of the ring of the segment 1, a part of the shield jack R is contracted to In the gap H between R and the origin O of the existing segment C _O , the new segment C _N
Assemble. To assemble the new segment C _N , in this embodiment, the ring-shaped segment C is sequentially assembled from the lower three-piece new segment C _N as shown in FIG. 9 (a). Therefore, when assembling the new segment C _N of these three pieces are assembled assembled shortened only shield jacks R position to place the new segment C _N, the other shield jacks R and thus supporting the excavation reaction force. At this time, as shown in FIG. 5 (b), at the place where the new segment C _N is assembled, the new segment C _N
The gap H between _N and the origin O of the shield jack R is only 100 mm, which is the segment assembly gap h. This step is the fourth step.

Then, as shown in FIG. 6 (a), the slide jack F is contracted by 600 mm and the shield jack R is also expanded by 600 mm to move the rear body 4 forward by 600 mm, which is the same amount as the fourth step. That is, the rear body 4 is pulled toward the front body 2 side by the same amount as the amount of the front body 2 excavated in the fourth step. At this time, as shown in FIG. 6 (b), since the rear body 4 is advanced by 600 mm from the newly assembled new segment C _N , the gap H from the origin O of the shield jack R is 700 mm.
Becomes Further, along with this excavation work, as shown in FIG. 9B, a two-piece new segment C _N is assembled on top of the three-piece new segment C _N assembled in the fourth step. This step is the fifth step, and a part of the shield jack R supporting the excavation reaction force from the fourth step to the fifth step has a maximum stroke of 1900 mm.
Becomes

After that, as shown in the sectional view of FIG.
With the slide jack F provided on the front body 2, the front body 2 is advanced by a depth of 400 mm which is less than half of 1200 mm which is one ring width of the segment C. This excavation is the sixth step, and the amount of this excavation is the same as that of the first excavation in the first step. At this time, the rear body 4 does not move.
As shown in (b), the gap H between the shield jack R and the segment C is 700 mm, which is the same as in the first step.

The amount of excavation in this sixth step is the same as that in the third step.
The width of segment C is 1200 mm, which is the sum of the excavation amount in the process of 200 mm and the excavation amount of 600 mm in the fourth process.
The slide amount F and the shield jack R are separately controlled so that the total amount of excavation is the same as the segment width.

Then, the slide jack F is stopped as shown in the sectional view of FIG. 8 (a), and as shown in FIG. 9 (d).
By assembling the key segment C _M on top of the assembled 5-piece new segment C _N , the assembly of the ring-shaped new segment C _N is completed. Front body 2 at this time
Since the rear torso 4 does not move, as shown in FIG. 8 (b),
The gap H between the newly assembled new segment C _N and the origin O of the shield jack R is 700 mm. This step is the 7th step, and as a result, a new ring-shaped segment C _N
The assembly work of is completed.

The above is the process of assembling the one-ring segment C. By sequentially repeating the above-mentioned second to seventh processes, it is possible to perform simultaneous excavation in which segment assembling work is performed simultaneously while excavating work. It is possible to realize a simultaneous excavation method capable of significantly shortening the construction period of the double-body shield machine S.

The digging amount of the slide jack F and the shield jack R in the above embodiment is a preferable example,
These digging amounts may be values as shown in Table 1 below, for example.

[0038]

[Table 1]

As shown in Table 1, the second, third and fifth
The amount of individual excavation of the shield jack R in the process is approximately half the segment width or less, and the total amount of excavation may be the segment width.

On the other hand, the shield construction method by the above-mentioned steps is a simultaneous excavation construction method for constructing a straight tunnel or the like, and according to the invention of this application, a curved construction for constructing a curved tunnel or the like is performed as follows. A simultaneous excavation method for construction is also possible.

That is, in the case of the curved construction, the center folding mechanism 8 provided between the front rear body 4A and the rear rear body 4B of the above-mentioned double-barrel type shield machine S is used, and as shown in FIG. This can be achieved by adjusting the extension amounts of the plurality of slide jacks F or shield jacks R during the excavation in the second step to the seventh step shown in FIG. 8A by the control device.

Also in this case, the direction control can be easily performed in the third step shown in FIG. 4 (a) as in the case of the straight-ahead construction. The simultaneous excavation method of bending construction becomes possible while performing.

When performing this curved construction, the machine length is usually long due to the necessity of providing the center folding mechanism 8. However, according to the double-body shield machine S according to this application, the slide jack on the front body 2 side is provided. Because the stroke can be shortened,
It is possible to make the length of the front body 2 compact,
The overall captain of the double-barrel shield machine S can be made compact.

[0044]

Since the invention according to this application is configured as described above, it has the following effects.

According to the double-body shield machine of the first aspect, the stroke of the slide jack provided between the front body and the rear body is shortened so that the front body and the rear body can be slid in the axial direction. Since it is possible to shorten the length of the double-barrel type shield machine connected to, it is possible to carry in even a small vertical shaft, and it is possible to reduce costs such as securing a vertical shaft site and forming a vertical shaft. Moreover, since the shield jack and the slide jack can be separately controlled for expansion and contraction, the simultaneous excavation method can be performed, so a compact shield excavator realizes the simultaneous excavation shield method that can shorten the construction period and reduce construction costs. it can.

According to the simultaneous excavation method using the double-barreled shield machine according to claims 2 to 4, the front body and the rear body are axially slidably connected to each other, and a plurality of slide jacks are provided on the front body side. In addition, with the double-barrel type shield machine equipped with multiple shield jacks on the rear trunk side, it is possible to simultaneously excavate and simultaneously perform segment assembly work, and it is possible to shorten the length of the shield machine. Therefore, a compact shield excavator can realize a simultaneous excavation shield method that can shorten the construction period and reduce the construction cost.

Particularly, according to the simultaneous excavation method according to claim 2, in the third step, the shield excavator can be controlled in direction by adjusting the extension amounts of the plurality of shield jacks. A simple simultaneous excavation shield method is possible, and work can be continued without requiring special time for direction control, so it is possible to construct an accurate tunnel in a short construction period and further reduce construction costs. You can

Further, according to the simultaneous excavation method according to claim 3, in the third step, by adjusting the extension amounts of the plurality of shield jacks, the center folding mechanism provided on the rear trunk side of the shield excavator is used. Since the bending work can be performed while controlling the direction, the bending shield construction method that significantly reduces the construction period and reduces the construction cost and the like becomes possible.

[Brief description of drawings]

1 is a drawing showing an initial state of a simultaneous excavation method for a double-barreled shield machine according to this application, (a) is a sectional view of the shield machine, and (b) is a gap between a segment and a shield jack. It is a side view shown.

FIG. 2 is a drawing showing a first step in a simultaneous excavation method for a double-barreled shield machine according to this application, (a) is a cross-sectional view of the shield machine, and (b) is a gap between a segment and a shield jack. It is a side view which shows.

FIG. 3 is a drawing showing a second step in the simultaneous excavation method for the double-shield shield machine according to this application, (a) is a cross-sectional view of the shield machine, and (b) is a gap between the segment and the shield jack. It is a side view which shows.

FIG. 4 is a drawing showing a third step in the simultaneous excavation method for a double-barreled shield machine according to this application, (a) is a sectional view of the shield machine, and (b) is a gap between the segment and the shield jack. It is a side view which shows.

FIG. 5 is a drawing showing a fourth step in the simultaneous excavation method for the double-barrel shield machine according to the present application, where (a) is a cross-sectional view of the shield machine and (b) is a gap between the segment and the shield jack. It is a side view which shows.

FIG. 6 is a drawing showing a fifth step in the simultaneous excavation method for the double-barrel shield machine according to the present application, where (a) is a cross-sectional view of the shield machine and (b) is a gap between the segment and the shield jack. It is a side view which shows.

FIG. 7 is a drawing showing a sixth step in the simultaneous excavation method for a double-barreled shield machine according to this application, where (a) is a sectional view of the shield machine and (b) is a gap between the segment and the shield jack. It is a side view which shows.

FIG. 8 is a drawing showing a seventh step in the simultaneous excavation method for a double-barreled shield machine according to this application, where (a) is a sectional view of the shield machine and (b) is a gap between the segment and the shield jack. It is a side view which shows.

FIG. 9 is a view showing a state in which segments are assembled in the fourth step to the seventh step in the simultaneous excavation method for the double-barreled shield excavator according to this application, (a) is the fourth step, and (b) is a drawing.
Shows the fifth step, (c) shows the sixth step, and (d) shows the seventh step.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Cutter disk 2 ... Front body 3 ... Electr device 4 ... Rear body 4A ... Front rear body 4B ... Rear rear body 5 ... Slide part 6 ... Link member 7 ... Support frame 8 ... Center folding mechanism 8a ... Spherical seat O ... origin H ... gap h ... segments embedded clearance C ... segment C _O ... existing segment C _N ... new segment C _M ... key segment F ... slide jack R ... shield jacks S ... Fukudo type shield machine

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-2-153192 (JP, A) JP-A-5-306596 (JP, A) Actual Kaihei 6-49593 (JP, U) Japanese Patent Publication 3- 23720 (JP, B2) (58) Fields investigated (Int.Cl. ⁷ , DB name) E21D 9/06 E21D 9/06 302

Claims (4)

(57) [Claims] 1. A double-body shield machine having a front body having a cutter disk on the front surface and a rear body having an erector device for assembling segments at the rear portion slidably connected in the axial direction. A plurality of slide jacks having a stroke approximately half of the segment width, and a plurality of strokes having substantially the same stroke as the sum of the segment width, the stroke of the slide jack and the segment mounting gap in the rear body. 2. A double-body shield machine having a shield jack and a control device for separately expanding and contracting the shield jack and the slide jack. 2. A double-body shield excavation in which a front body and a rear body are axially slidably connected to each other, a plurality of slide jacks are provided on the front body side, and a plurality of shield jacks are provided on the rear body side. In the simultaneous excavation method by machine, (a)
From the state that there is a predetermined gap between the shield jack and the existing segment, the first step of making the first excavation of the front body with the slide jack at less than about half of the segment width and above the segment built-in gap, (b) by the shield jack A second step in which the rear body is advanced by the same amount as the first step and the slide jack is contracted by the same amount in the same amount, (c) The shield jack and the front body are secondly advanced by the shield body and the shield jack and the existing segment are formed. A third step of forming a gap in which the segment width and the segment built-in gap are combined, and
Along with the process and the third process, the segment width is excavated at about half or less of the segment width so that the segment width is obtained, and a part of the shield jack is contracted to assemble a new segment in the gap. Step (e) The rear body is dug by the same amount as the fourth step by the slide jack and the shield jack, and
The fifth step of shrinking a part of the shield jack other than the step and assembling a new segment in the gap, (f) The forward trunk is dug by the same amount as the first step of the first step by the slide jack. Process, (g) 7th process of assembling the key segment by stopping the slide jack, and (b) to (g) 2nd to 7th processes are sequentially repeated to perform excavation work and segment assembly work. Simultaneous digging method of shield machine, characterized by performing simultaneously and. 3. The simultaneous excavation method for a double-body shield machine according to claim 2, wherein the direction of the shield machine is controlled by adjusting the extension amounts of the plurality of shield jacks in the third step. . 4. A center folding mechanism is provided on the rear torso side, and bending operation is performed while controlling the direction of the shield machine by adjusting the extension amount of the plurality of shield jacks. The simultaneous excavation method for the double-barreled shield machine according to claim 2.