JP2010059606A - Subterranean start method for middle-fold type master/slave shield machine and the master/slave shield machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a subterranean start method for a middle-fold type master/slave shield machine for letting only the slave shield machine advance and excavate the ground in a stable condition by blocking a middle-fold interval section of the master shield machine being left in the ground and preventing the occurrence of water leakage inside the shield machine. <P>SOLUTION: This subterranean start method for the middle-fold type master/slave shield machine comprises the processes for: anchoring a skin plate 14a of the master shield machine in a front barrel part of the shield machine in the ground around it after letting the shield machine 10 advance up to the predetermined position in the ground while excavating; separating a skin plate 16a of the slave shield machine in the front barrel part from the skin plate 14a of the master shield machine in the front barrel part; integrating the skin plate 16a of the slave shield machine in the front barrel part, a skin plate 14b of the master slave machine in a rear barrel part, and a skin plate 16b of the slave shield machine in the rear barrel part mutually to excavate the ground by the length equivalent to the section (s) of middle-fold interval; letting the shield machine 10 advance until a tip of the skin plate 14b of the master shield machine in the rear barrel part is abutted on a rear end of the skin plate 14a of the master shield machine in the front barrel part; and blocking the middle-fold interval section (s) in the skin plate 14 of the master shield machine. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a ground start method for a folding type parent-child shield machine, and in particular, after a dug in a state in which a folded type child shield machine and a folded type parent shield machine are integrated, The present invention relates to an underground start method of a folding parent-child shield machine that forms a shield tunnel in which the outer diameter of a segment changes in the middle by separating from a shield machine and using only a child shield machine, and a parent-child shield machine.

  In shield construction, as a method of changing the outer diameter of a tunnel in the ground without interposing a shaft, there is known a parent-child shield method in which a child shield machine having a small outer diameter is started from a parent shield machine having a large outer diameter. (For example, refer to Patent Document 1). In the parent-child shield construction method disclosed in Patent Document 1, the parent-child shield machine has a propulsion mechanism for the child shield machine and a propulsion mechanism for the parent shield machine, which are complicated in structure and economical. But there are disadvantages.

On the other hand, for example, in places where the earth covering gradually decreases or where the earth pressure gradually decreases due to changes in soil quality, the segments installed in the middle of the tunnel are replaced with thinner segments. It is known that construction efficiency can be effectively improved and construction costs can be reduced by constructing a shield tunnel. When constructing a shield tunnel in which the thickness of the segment changes in the middle of such a tunnel and the outer diameter is slightly reduced accordingly, the propulsion mechanism of the parent shield machine and the propulsion mechanism of the child shield machine are combined. A technique using a parent-child shield machine that has been made possible has also been developed (see, for example, Patent Document 2).
JP-A-2-210189 JP 11-280375 A

  According to the parent-child shield machine described in Patent Document 2, the folding-type child shield machine is arranged concentrically inside the folding-type parent shield machine, and these skin plates are separated via a lock mechanism. By digging up to a predetermined position in the ground in a connected and integrated state, disconnect the child shield machine from the parent shield machine, and dig only the child shield machine while leaving the parent shield machine in the ground In the middle of the tunnel, a shield tunnel is formed in which the outer diameter of the segment is reduced.

  On the other hand, according to the parent-child shield machine described in Patent Document 2, in order to be able to fold the parent machine skin plate constituting the parent shield machine, the front trunk main machine skin plate and the rear trunk master machine skin plate For example, a middle folding interval of about 100 mm is interposed between the two. Therefore, if such a middle folding interval part is left unoccluded on the base unit skin plate that remains in the ground, for example, even if chemical injection or the like is applied to the surrounding ground, the middle folding interval part As a weak point, there is a possibility of causing water leakage inside the parent shield machine and the child shield machine.

  Further, according to the parent-child shield machine described in Patent Document 2, since only a small gap remains between the child shield machine and the parent shield machine, the child shield machine is separated from the parent shield machine and started. At this time, the skin plate of the parent shield machine may move along with the child shield machine.

  For this reason, according to the parent-child shield machine described in Patent Document 2, before starting the child shield machine, the skin plate of the parent shield machine is connected and fixed in advance to the segment installed inside this via a fixing material. The method of avoiding accompanying movement is adopted, but it is used for fixing work such as welding the fixing material to the inner peripheral surface of the skin plate and joining work using fastening bolts between the fixing material and the segment. Since much time is required, it is desired to develop a simpler technique that can prevent the skin plate of the parent shield machine from moving along with the child shield machine.

  The present invention has been made paying attention to such a conventional problem, and closes the middle folding interval portion of the center folding type parent shield machine left at a predetermined position in the ground, thereby To provide a ground start method for a folding parent-child shield machine capable of digging only a folded child shield machine in a stable state while avoiding water leakage inside the shield machine With the goal.

  In addition, the present invention can effectively avoid the movement of the skin plate of the parent shield machine following the child shield machine when the child shield machine is started from the parent shield machine by a simple configuration. An object is to provide a parent-child shield machine that can be used.

  The present invention relates to a folding child shield machine equipped with a cutter head capable of expanding / contracting a cutting diameter, a compartment, an excavating earth and sand carrying device, a shield jack, and a segment assembling device. A machine skin plate is detachably concentrically arranged, and after the child shield machine and the parent shield machine are integrated into a predetermined position in the ground, the child shield machine is moved to the parent shield. It is a ground start method for a folding type parent-child shield machine that forms a shield tunnel in which the outer diameter of the segment changes in the middle by being separated from the machine and excavating only with the child shield machine, wherein the parent machine skin plate Consists of a front body base machine skin plate and a rear body base machine skin plate that are arranged with intervening intervals, and a slave machine skin of the child shield machine. The plate is composed of a front body child machine skin plate and a rear body child machine skin plate which are provided continuously with a middle folding interval part therebetween, and the front body part main body skin plate and the front body part of the front body part. The slave unit skin plate, the rear trunk unit master unit skin plate of the rear trunk unit, and the rear trunk unit slave unit skin plate are integrated so as to be separable from each other. After digging up to a predetermined position, in the front torso, the front torso base unit skin plate is fixed to the surrounding ground so as not to move, and the front torso unit slave unit skin plate and the front torso unit base are fixed. A step of releasing the integration of the machine skin plate so that they can be separated, and the front body child machine skin plate of the front body part and the rear body part with the front body base machine skin plate fixed The rear trunk base unit By integrating the kin plate and the rear body slave unit skin plate as much as the length corresponding to the intermediate folding interval, the front end of the rear trunk unit skin plate becomes the front body base unit skin. Advance until the rear end of the plate comes into contact with the platen, and close the intermediate folding space in the base unit skin plate, and in the back torso, fix the back torso base unit skin plate to the surrounding ground and move it. And the step of releasing the integration of the rear trunk unit skin plate and the rear trunk unit skin plate so that they can be separated, and then the front trunk unit skin plate. And while the rear trunk base unit skin plate is fixed in the ground, the front trunk unit slave unit skin plate and the rear trunk unit slave unit skin plate are moved forward as a unit, The above object is achieved by providing an underground starting method for a folding parent-child shield machine including a step of excavating the shield machine.

  The ground folding method of the middle folding type parent-child shield machine according to the present invention includes the integration of the front trunk base machine skin plate and the front trunk slave machine skin plate, and the rear trunk master machine skin plate. And the rear body child machine skin plate are integrated into the front body child machine skin plate or the rear body child machine skin plate, a plurality of child machine side pin fixing holes, and the child machine side pin The integrated holding anchor pin is fitted and fixed by matching each of the plurality of master unit side pin fixing holes formed in the front trunk unit main body skin plate or the rear trunk unit main unit skin plate corresponding to the fixing hole. The integrated holding anchor pin is fitted so as to be slidable and extrudable toward the ground outside the front trunk base machine skin plate or the rear trunk master machine skin plate, and Integration When the child shield machine is separated from the parent shield machine, the holding anchor pin is located outside the front trunk base machine skin plate or the rear trunk master machine skin plate so as to be removed from the slave machine side pin fixing hole. The rear end side fixing part is fixed to the base unit pin fixing hole by being pushed out, and the front end side anchor part bites into the ground on the outer side of the front body base body skin plate or the back body base body skin plate. It is preferable that the front trunk base machine skin plate or the rear trunk base machine skin plate is fixed on the surrounding ground by projecting in this manner and exhibiting an anchor function.

  Further, the present invention concentrically separates a child shield machine equipped with a cutter head capable of expanding and reducing the cutting diameter, a compartment, an excavating earth and sand carrying device, a shield jack, and a segment assembling device into the main body skin plate. After digging up to a predetermined position in the ground with the child shield machine and the parent shield machine being integrated, the child shield machine is separated from the parent shield machine and dug only with the child shield machine In the parent-child shield machine that forms a shield tunnel in which the outer diameter of the segment changes in the middle, the integration of the child shield machine and the parent shield machine is a plurality of slave machines formed on the slave machine skin plate A side pin fixing hole and a plurality of base unit side pin fixing holes formed in the base unit skin plate so as to correspond to the base unit side pin fixing hole are matched to each other. The integrated holding anchor pin is fitted and fixed so as to be slidable toward the ground outside the base unit skin plate, and the integrated holding anchor pin is fixed. The anchor pin is pushed to the outside of the master unit skin plate so as to be detached from the slave unit side pin fixing hole when the slave shield unit is separated from the master shield unit, and the rear end side fixing unit is The above-mentioned object is achieved by providing a parent-child shield machine that is fixed in the fixing hole and projects so that the tip side anchor portion bites into the ground outside the base machine skin plate and exerts an anchor function. is there.

  According to the underground start method of the middle folding type parent-child shield machine of the present invention, the middle folding interval portion of the middle folding type parent shield machine left at a predetermined position in the ground is closed, While avoiding the occurrence of water leakage inside the child shield machine, only the folding child shield machine can be dug in a stable state.

  Further, according to the parent-child shield machine of the present invention, when starting the child shield machine from the parent shield machine, the skin plate of the parent shield machine moves along with the child shield machine with a simple configuration. It can be effectively avoided.

  As shown in FIG. 1 (a), for example, a front-body part 11 and a rear-body part are used as the folding parent-child shield machine 10 and the parent-child shield machine, to which the starting method according to a preferred embodiment of the present invention is applied. 12 is a half-folded muddy water type shield machine, and a child machine skin plate 16 constituting a child shield machine 15 is concentrically arranged inside a parent machine skin plate 14 constituting the parent shield machine 13. It has a double structure. Moreover, the folding type parent-child shield machine 10 has left the parent shield machine 13 in the ground after digging to a predetermined position in the ground with the child shield machine 15 and the parent shield machine 13 connected and integrated. Only the child shield machine 15 can be started from the parent shield machine 13 and can be dug (see FIGS. 17 and 2), and the parent shield machine 13 left in the ground can be removed by the start method of this embodiment. Prior to the start of the child shield machine 15, the intermediate folding interval portion s of the parent machine skin plate 14 to be configured can be reliably closed (see FIG. 12).

  And the starting method of the folding type parent-child shield machine 10 according to the present embodiment includes a cutter head 17 capable of expanding / contracting a cutting diameter, a compartment 18, an excavating earth and sand unloading device 19, a shield jack 20, and a segment assembling device 21. The installed middle folding type child shield machine 15 is arranged concentrically in a detachable manner inside the parent machine skin plate 14 of the middle folding type parent shield machine 13 so that the child shield machine 15 and the parent shield machine 13 are integrated. After digging up to a predetermined position in the ground in the converted state, by separating the child shield machine 15 from the parent shield machine 13 and digging only with the child shield machine 15, the outer diameters of the segments 22a and 22b change midway. A shield excavator for ground starting, which forms a shield tunnel, in which a main body skin plate 14 has a front trunk that is continuously provided with an intermediate folding space portion s interposed therebetween. The child machine skin plate 16 of the child shield machine 15 is composed of a parent machine skin plate 14a and a rear body master machine skin plate 14b. And the rear trunk unit skin plate 16b, the front trunk unit skin plate 14a and the front trunk unit skin plate 16a of the front trunk unit 11, the rear trunk unit skin plate 14b of the rear trunk unit 12, and The rear body slave unit skin plate 16b is integrated with each other so as to be separable.

  Moreover, as shown in FIGS. 11-17, the starting method of the middle folding type | mold parent-child shield machine 10 of this embodiment is the predetermined | prescribed underground in the state which integrated the parent shield machine 13 and the child shield machine 15 as shown in FIGS. After digging to the position (see FIG. 11), in the front trunk portion 11, the front trunk portion main body skin plate 14a is fixed to the surrounding ground so as not to move, and the front trunk portion subsidiary skin skin 16a and the front The step of releasing the integration of the body part base unit skin plate 14a so that these can be separated (see FIG. 12), and the front body part of the front body part 11 with the front body part base unit skin plate 14a fixed. By making the slave unit skin plate 16a, the rear trunk unit master unit skin plate 14b and the rear trunk unit slave unit skin plate 16b of the rear trunk unit 12 as one body, digging a length corresponding to the intermediate folding interval portion s, Rear torso Advancement until the front end of the machine skin plate 14b comes into contact with the rear end of the front body base machine skin plate 14a to close the middle folding interval portion s in the machine body skin plate 14 (see FIG. 12); In part 12, the rear trunk base unit skin plate 14b is fixed to the surrounding ground so as not to move, and the rear trunk unit slave unit skin plate 16b and the rear trunk unit base unit skin plate 14b are unintegrated. The process of making them separable (see FIG. 13), and then the front body slave skin with the front trunk base skin plate 14a and the rear trunk base skin plate 14b fixed in the ground. A step (see FIG. 17) of digging the child shield machine 15 while the plate 16a and the rear trunk child machine skin plate 16b are advanced together.

  Furthermore, in this embodiment, the front trunk base unit skin plate 14a and the front trunk unit slave unit skin plate 16a are integrated, and the rear trunk unit base unit skin plate 14b and the rear trunk unit slave unit skin plate 16b are integrated. As shown in FIG. 3A in an enlarged view of part A in FIG. 1, a plurality of handset side pin fixing holes formed in the front body handset skin plate 16a or the rear body handset skin plate 16b. 23, and a plurality of master unit side pin fixing holes 24 formed in the front trunk base unit skin plate 14a or the rear trunk unit master unit skin plate 14b so as to correspond to the slave unit side pin fixing hole 23, The integrated holding anchor pin 25 is fitted and fixed. The integrated holding anchor pin 25 is slid toward the ground outside the front trunk base machine skin plate 14a or the rear trunk base machine skin plate 14b. It has been able to fit out.

  Furthermore, in this embodiment, the integrated holding anchor pin 25 uses, for example, an extrusion jack 70 as shown in FIGS. 4A and 4B when the child shield machine 15 is separated from the parent shield machine 13. Then, the rear end side fixing unit 25a is pushed out of the front trunk base unit skin plate 14a or the rear trunk base unit skin plate 14b so as to be disengaged from the slave unit side pin fixing hole 23. The front-side anchor portion 25b protrudes so as to bite into the ground outside the front trunk base skin plate 14a or the rear trunk base skin plate 14b and exhibits an anchor function. The master skin plate 14a or the rear trunk master skin plate 14b is fixed to the surrounding ground (see FIG. 5).

  In the present embodiment, the shield tunnel formed by the folding parent-child shield machine 10 is, for example, a tunnel for a common groove, and is formed so that the outer diameters of the segments 22a and 22b are reduced by about 120 mm in the middle of the tunnel. As the large outer diameter segment, for example, the large diameter segment 22a having an outer diameter of 5200 mm and a thickness of about 200 mm is used, and as the small outer diameter segment, for example, the outer diameter is 5080 mm and the thickness is 200 mm. A small-diameter segment 22b having a certain degree is used. In the present embodiment, the large-diameter segment 22a has the main body skin plate 14 (rear body main body skin 14) in the rear body portion 12 when the child shield machine 15 and the main shield machine 13 are integrated. Plate 14b) is assembled inside (see FIG. 1 (a)), and the small-diameter segment 22b is connected to the child skin plate 16 (rear body) in the rear trunk portion 12 when only the child shield machine 15 is dug. The slave unit skin plate 15b and the tail slave unit skin plate 16c) are assembled inside (see FIG. 2).

  The child shield machine 15 that constitutes the parent-child shield machine 10 of the present embodiment has substantially the same configuration as a known muddy water type shield machine. That is, as shown in FIGS. 1A and 2, the interior of the front body slave unit skin plate 16 a disposed on the front body unit 11 side of the child shield unit 15 is the partition wall 27 installed at the front part thereof. The part closer to the cutter head 17 than the partition wall 27 is a compartment 18 for filling excavated earth and sand together with mud water to counter the earth pressure from the face. In addition, a rotational drive mechanism 28 including a hydraulic or electric motor, a reduction gear, a gear, and the like is provided inside the front trunk unit skin plate 16a so as to be supported by the partition wall 27. The cutting surface can be cut by rotating the cutter head 17 supported via the rotating shaft 29 by the driving force of the rotation driving mechanism 28.

  As shown in FIG. 1B, the cutter head 17 is a known one including a center bit 17a, a spoke 17b, a face plate 17c, a cutting-slip intake port 17d, and the like, and the front end of the front body slave unit skin plate 16a. It is provided in front of this so as to cover the opening. In addition, a large number of cutter bits 17e are fixed to the spoke 17b and the face plate 17c, and a copy cutter 30 capable of moving back and forth in the radial direction is attached to the tip of the spoke 17b from the front body slave unit skin plate 16a. Is also provided to protrude outward. By moving the copy cutter 30 back and forth in the radial direction, the cutting diameter by the cutter head 17 is expanded, and excavation is performed on the excavation cross section substantially the same as the outer diameter of the parent shield machine 13, or the surplus portion of the parent shield machine 13 Can be excavated. Further, the cutting diameter by the cutter head 17 can be reduced so that excavation can be performed on the excavation cross section substantially the same as the outer diameter of the child shield machine 15, and the excavation portion of the child shield machine 15 can be excavated.

  In addition, a mud pipe 31 and a mud pipe 32 as excavating earth and sand carrying-out devices 19 connected to the compartment 18 are provided in the rear part of the front body slave unit skin plate 16a partitioned by the partition wall 27. These mud feeding pipes 31 and the mud discharging pipes 32 are assembled into segments 22a and 22b through the inside of the rear trunk child machine skin plate 16b toward the rear start shaft (not shown). It extends to the inside.

  Furthermore, one end portion of a bent jack 33 attached across the front trunk portion 11 and the rear trunk portion 12 is attached to the support bracket 34a at the rear portion defined by the partition wall 27 of the front trunk unit skin plate 16a. And the front portion of the cylinder portion 20a of the shield jack 20 supported and fixed to the rear trunk unit skin plate 16b protrudes to the front trunk unit skin plate 16a side. Has been.

  The rear body slave unit skin plate 16b can be folded with respect to the front trunk unit slave unit skin plate 16a by holding a middle folding interval portion s of, for example, about 100 mm behind the front trunk unit slave unit skin plate 16a. The slave unit skin plate 16 is formed together with the front trunk unit slave unit skin plate 16a and the tail unit slave unit skin plate 16c described later. The rear body slave unit skin plate 16b is joined to the inner side surface of the front end portion thereof, and a ball seat plate 35 is provided to protrude toward the front trunk unit slave unit skin plate 16a. The outer peripheral surface of the ball seat plate 35 is brought into sliding contact with the inner surface of the rear end portion of the front body slave unit skin plate 16a, so that it can be bent and the front end portion of the rear body slave unit skin plate 16b The middle folding interval portion s between the front body slave unit skin plate 16a and the rear end portion can be filled with the ball seat plate 35.

  Further, the other end portion of the bent jack 33 is attached to the inner side of the rear trunk child machine skin plate 16b via a support bracket 34b, and the shield jack 20 is supported and attached to the support plate 36. It has been.

  Further, on the inner side of the rear body slave unit skin plate 16b, supported by the inner peripheral surface thereof, an erector as the segment assembly device 21 and a work deck 37 are attached to a tail unit slave unit skin plate 16c described later. It extends to the part.

  According to the present embodiment, the front body child machine skin plate 16a, rear body child machine skin plate 16b, and tail part child machine skin plate 16c constituting the child machine skin plate 16 have a thickness of 36 mm, for example. It is made of a steel plate having a cylindrical shape, and has an inner diameter slightly larger than the outer diameter of the small-diameter segment 22b, for example, about 5140 mm, and has an outer diameter of, for example, about 5212 mm.

  The parent shield machine 13 constituting the parent-child shield machine 10 according to the present embodiment is constituted by a parent machine skin plate 14, which is propelled by a cutter head, a compartment, an excavation earth and sand carry-out device, a shield jack, a segment assembly device, and the like. The mechanism is shared by the cutter head 17, the compartment 18, the excavated earth and sand carry-out device 19, the shield jack 20, the segment assembly device 21, and the like provided in the child shield machine 15. In addition, the master machine skin plate 14 includes a front trunk master machine skin plate 14 a disposed in the front trunk part 11 of the parent-child shield machine 10 and a rear trunk part disposed in the rear trunk part 12 of the parent-child shield machine 10. It is comprised by the main | base_machine skin plate 14b.

  The front trunk base unit skin plate 14a is made of, for example, a cylindrical steel plate having a thickness of about 30 mm, and is slightly larger than the outer diameter of the front trunk unit slave unit skin plate 16a. The front cylinder has a large inner diameter of, for example, about 5272 mm and an outer diameter of, for example, about 5332 mm, and maintains a distance of, for example, about 30 mm between the outer surface of the front body unit slave unit skin plate 16a. It arrange | positions concentrically so that it may become a double structure on the outer side of the slave unit skin plate 16a.

  Further, in the present embodiment, a spacing retaining ring 38 that is interposed between the front trunk base unit skin plate 14 a and the front trunk unit skin plate 16 a and extends in the circumferential direction is provided on the parent shield shield machine 10. A plurality of axially spaced intervals are provided, and the interval holding ring 38 allows the above-described interval of, for example, about 30 mm between the front trunk base unit skin plate 14a and the front trunk unit slave unit skin plate 16a. Is to be retained.

  Further, in the present embodiment, a plurality of integrated holding anchor pins 25 to be described later are arranged in a distributed manner so as to penetrate the front trunk base unit skin plate 14a and the front trunk unit slave unit skin plate 16a. The front body master skin plate 14a and the front body slave are installed by fitting the integrated holding anchor pin 25 into the pin fixing holes 23 and 24 (see FIG. 3A). The state in which the skin plate 16a can be pushed out as a unit and the integral holding anchor pin 25 are pushed out toward the ground outside the base unit skin plate 14 so that the front torso base unit skin plate 14a and the front torso unit are pushed out. The machine skin plate 16a is cut off (see FIG. 5), and the state where only the front body slave machine skin plate 16a can be pushed out in the digging direction is switched. So that the can Rukoto.

  Furthermore, in the present embodiment, the front barrel base unit skin plate 14a and the front trunk unit slave unit skin plate are disposed at the front end portion of the front barrel unit 11 as shown in FIG. A tip water stop part 39 made of, for example, nitrile rubber is attached so as to fill the gap between the gap 16a and the muddy water or earth and sand can be prevented from flowing through the gap.

  In the present embodiment, the tip water-stopping component 39 and the spacing retaining ring 38 are provided at a spacing portion of, for example, about 30 mm that is held between the front trunk portion master unit skin plate 14a and the front trunk unit slave unit skin plate 16a. The filler is made of, for example, grease so as to fill the portion between the two and the adjacent spacing ring 38. As a result, when the front body slave unit skin plate 14a and the front body slave unit skin plate 16a are extruded as a unit, or when only the front body unit slave unit skin plate 16a is extruded, muddy water or earth and sand are placed in the space between them. Can be more effectively prevented from flowing in.

  Here, the filler such as grease is connected to a filler press fitting 40 (see FIG. 1) attached to an appropriate position on the inner peripheral surface of the front body slave unit skin plate 16a, for example, and the filler press fit is performed. By press-fitting the filler through the hardware 40, it is possible to easily fill the space between the front trunk base unit skin plate 14a and the front trunk base unit skin plate 16a. Further, from the state in which the front trunk base machine skin plate 14a and the front trunk slave machine skin plate 16a are integrated, the integrated holding anchor pin 25 is pushed out to the front trunk master machine skin plate 14a and the front trunk section. When the child machine skin plate 16a is separated, the filling pressure of the filler is applied through the filler press fitting 40, so that the integrated front trunk main body skin plate 14a and front trunk child machine skin plate are integrated. The front body slave unit skin plate 16a can be smoothly separated from the front body unit base unit skin plate 14a and advanced forward by effectively cutting off the front body unit slave unit skin plate 16a.

  Moreover, in this embodiment, as shown to FIG. 1 (a), (b) and FIG. 8 (a), (b), it is the upper part of the front trunk | drum main body skin plate 14a. A notch passage groove 41 through which a simultaneous back-injection device 50 (see FIGS. 2 and 17), which is attached to the outer peripheral portion of the tail unit slave unit skin plate 16c, which will be described later, projects outward is passed when the slave shield unit 15 starts. However, it extends over the entire length of the front trunk base skin plate 14a in the axial direction and is formed at two locations.

  The notch passage groove 41 is formed in a straight line with a width of, for example, about 520 mm, and is made of steel having a cross-section with an isosceles trapezoid so that the entire notch passage groove 41 is covered from the outside. The passage groove cover body 42 is attached with its legs cut out and fixed to both side edges of the passage groove 41 (see FIG. 8A). Further, a flap lid member 43 is hinged and attached to the front end of the passage groove cover body 42 so as to be openable and closable, and a portion immediately after the flap lid member 43 is made of, for example, hard urethane. A water filler 44 is provided so as to fill the inside of the passage groove cover body 42 (see FIG. 8B).

  In the state before the child shield machine 15 is started from the parent shield machine 13 and passed through the simultaneous back-injecting device 50 attached to the tail unit child machine skin plate 16c, the flap type lid member 43 and the water stop filler 44 are provided. Closes the front end of the passage groove cover body 42 to prevent earth and sand and muddy water from flowing into the main body skin plate 14 through the passage groove cover body 42 and the notch passage groove 41. Further, as shown in FIG. 10A, when the slave unit simultaneous back-injection device 50 attached to the tail unit slave unit skin plate 16c passes through the notch passage groove 41, the simultaneous back-injection device 50 is provided. Is advanced to reach the tip of the passage groove cover body 42, the water stop filler 44 is destroyed, and the flap type lid member 43 is rotated so as to be pushed up from the rear while rotating the tip of the passage groove cover body 42. By opening the part, the simultaneous back-filling injection device 50 can be passed smoothly (see FIGS. 16 and 17).

  On the other hand, a rear trunk base unit is provided so as to be foldable with respect to the front trunk base unit skin plate 14a by holding a middle folding interval portion s of, for example, about 100 mm behind the front trunk base unit skin plate 14a. The skin plate 14b is made of a cylindrical steel plate having a thickness of, for example, about 36 mm, similar to the front trunk base unit skin plate 14a, and is slightly larger than the outer diameter of the rear trunk unit slave unit skin plate 16b, for example, about 5260 mm. And an outer diameter of about 5332 mm, for example, and a rear body unit skin plate with a distance of about 24 mm between the outer surface of the rear body unit skin plate 16b. It arrange | positions concentrically so that it may become a double structure on the outer side of 16b. Further, as shown in FIG. 1 (a), the rear trunk base unit skin plate 14b extends backward, for example, about 3800 mm longer than the rear trunk unit slave unit skin plate 16b. As a result, a working space for installing the large-diameter segment 22a along the inner peripheral surface of the rear trunk main unit skin plate 14b is secured inside the extended portion. Then, the erector 21 and the work deck 37 supported from the inner peripheral surface of the rear trunk unit slave unit skin plate 16b are arranged to extend.

  Moreover, in this embodiment, the space | interval holding | maintenance ring 38 which is interposed between the rear trunk | drum main machine skin plate 14b and the rear trunk | drum child machine skin plate 16b, and extends in the circumferential direction is used for the parent-child shield machine 10. A plurality of axially spaced intervals are provided, and these interval holding rings 38 allow the above-described, for example, about 24 mm between the rear trunk base unit skin plate 14b and the rear trunk unit slave unit skin plate 16b. The interval is maintained.

  Further, in the present embodiment, an integrated holding anchor pin 25, which will be described later, passes through the rear trunk base unit skin plate 14b and the rear trunk unit slave unit skin plate 16b. The main body skin plate 14b of the rear trunk portion is arranged by being dispersedly disposed throughout and attached to a plurality of locations, and by fitting the integrated holding anchor pins 25 into the pin fixing holes 23 and 24 (see FIG. 3A). And the rear torso unit skin plate 16b can be pushed out as a unit, and the integrated holding anchor pin 25 is pushed out toward the ground outside the main unit skin plate 14, thereby rear body unit skin plate. 14b and the rear torso child unit skin plate 16b are separated (see FIG. 5), and only the rear torso child unit skin plate 16b can be pushed out. , And it is capable of switching.

  Furthermore, in this embodiment, at the rear end portion of the rear trunk unit skin plate 16b, as shown in FIG. An in-machine water stop component 45 made of, for example, nitrile rubber is attached so as to fill a gap between the slave unit skin plate 16b and the rear trunk base unit skin plate 14b and the rear side from the inside of the machine via the gap. Water can be prevented from flowing into the space between the body slave unit skin plate 16b.

  In the present embodiment, the space between the rear trunk base unit skin plate 14b and the rear trunk base unit skin plate 16b includes the front trunk base unit skin plate 14a and the front trunk unit slave unit. Similarly to the space between the skin plate 16a, the space between the adjacent space retaining rings 38 and the space between the space retaining ring 38 and the in-flight water stop component 45 are filled, for example from grease. Is filled with a filler.

  In the present embodiment, the upper portion of the rear trunk base skin plate 14b is disposed on the extension of the notch passage groove 41 and the passage groove cover body 42 provided in the front trunk base skin plate 14a. The base unit simultaneous back-injecting device 46 for injecting and filling the back-injecting material into the ground of the outer peripheral portion of the large-diameter segment 22a that is subsequently installed has the protective cover 48 as the rear body base unit skin plate. 14b is provided at two locations extending substantially over the entire length in the axial direction of 14b. As shown in FIG. 9 (a), the main unit simultaneous back-injection device 46 includes a back-injection piping 47 arranged along the outer peripheral surface of the rear trunk main unit skin plate 14b, and the arranged back-in. The protective cover 48 is provided so as to protrude outward from the outer peripheral surface of the rear trunk base machine skin plate 14 b so as to cover the injection pipe 47.

  Although the back injection pipe 47 is not shown in FIG. 1, for example, it extends rearward from the inside of the child shield machine 15, and in the rear part of the rear body child machine skin plate 16 b, By passing through the main body skin plate 14b from the inside to reach the outer peripheral surface thereof and extending rearward through the hollow interior of the protective cover 48, the rear end discharge port is located behind the rear trunk main body skin plate 14b. It arrange | positions so that it may open toward back from an end. As a result, during the excavation of the parent-child shield machine 10 in which the child shield machine 15 and the parent shield machine 13 are integrated, with the advancement of the rear trunk main machine skin plate 14b, It becomes possible to inject the backfilling material almost simultaneously into the ground disturbed by the surplus digging around the large diameter segment 22a left behind, and by the surplus digging around the large diameter segment 22a. It is possible to stabilize the disturbed ground quickly and easily.

  The protective cover 48 is a steel cover body having an isosceles trapezoidal cross section, and is attached with its legs welded and fixed to the outer peripheral surface of the rear trunk base machine skin plate 14b (FIG. 9A). )reference). Further, in this embodiment, the protective cover 48 has a front torso via a flexible bellows-like flexible cover body (not shown) having a flexible portion that can be bent, for example. It is provided continuously with the rear end of the passage groove cover body 42 provided on the base unit skin plate 14a. As a result, the intermediate folding interval portion s between the front trunk base machine skin plate 14a and the rear trunk master machine skin plate 14b is passed through the front end portion of the protective cover 48 and the rear end portion of the passage groove cover body 42. In addition, it is possible to effectively avoid the inflow of earth and sand into these. Furthermore, the rear end portion of the protective cover 48 is closed by a closing lid (not shown) that supports the rear end discharge port of the backfill injection pipe 47 in an open state. The inflow of earth and sand to the can be effectively avoided.

  Here, in the present embodiment, the portion where the tail unit slave unit skin plate 16c, which will be described later, is overlapped and arranged in the region from the middle part of the rear trunk unit master unit skin plate 14b to the front end edge part (FIG. 15, 16), prior to installing the tail unit slave unit skin plate 16c, as shown in FIG. 9B, the back unit injection pipe 47 and the rear trunk unit of the main unit simultaneous back unit injection unit 46 The portion sandwiched between the legs of the protective cover 48 of the base unit skin plate 14b is removed. As a result, the rear trunk portion passage groove 49 is formed in a state where the rear trunk portion main body skin plate 14b is sandwiched between the legs of the protective cover 48 and covered with the protective cover 48. As shown in FIG. 10 (b), the slave unit comprising the back injection pipe 51 and the protective cover 52 attached to the outer peripheral surface of the tail unit slave unit skin plate 16c through the rear trunk part passage groove 49. The simultaneous back-injecting device 50 can be arranged in a state of protruding to the outside of the rear trunk main unit skin plate 14b, and the arranged simultaneous slave back-injecting device 50 is arranged in the rear trunk. It can be advanced along the passage groove 49.

  Further, in the present embodiment, as shown in FIG. 1 (a), a flexible ring is arranged at the rear end portion of the rear trunk base skin plate 14b along the inner peripheral surface thereof. Three tail seals 64 are attached at intervals in the axial direction. The tail seal 64 is a well-known one that is used by being attached to a shield machine, and the large-diameter segment 22a that is left at the rear end portion of the rear trunk base machine skin plate 14b as the parent-child shield machine 10 moves forward. By sliding the inner edge of the outer peripheral surface into the outer peripheral surface, the gap between the large-diameter segment 22a and the rear trunk main unit skin plate 14b is closed, and earth and sand and water are removed from these gaps through the parent-child shield machine. 10 is prevented from entering the interior.

  And according to the parent-child shield machine 10 of this embodiment, when the child shield machine 15 and the parent shield machine 13 are dug together, the integration of these shield machines 15, 13 is shown in FIG. ), (B), a plurality of slave unit side pin fixing holes 23 formed in the front trunk unit slave unit skin plate 16a and the rear trunk unit slave unit skin plate 16b of the slave unit skin plate 16, and the master unit skin The plurality of master unit side pin fixing holes 24 formed in the front trunk base unit skin plate 14a and the rear trunk unit base unit skin plate 14b of the plate 14 are matched with each other, and the integrated holding anchor pin 25 is fitted and fixed. It is made by.

  That is, in the present embodiment, the slave unit skin plate 16 (the front trunk unit slave unit skin plate 16a or the rear trunk unit slave unit skin plate 16b) has a plurality of slave unit side pin fixing holes 23 having an outer diameter of, for example, about 180 mm. It is reinforced by a donut-shaped fixing hole reinforcing metal 53 having a diameter, and an opening is formed so as to have an inner diameter of about 80 mm, for example. Further, a plurality of master unit side pin fixing holes are provided at positions corresponding to the slave unit side pin fixing holes 23 in the master unit skin plate 14 (the front trunk unit master plate skin 14a or the rear trunk unit master unit skin plate 14b). 24 is reinforced by a donut-shaped fixing hole reinforcing metal 54 having an outer diameter of, for example, about 180 mm, and an opening is formed so as to have an inner diameter of, for example, about 80 mm.

  The integrated holding anchor pin 25 fitted into the matched slave unit side pin fixing hole 23 and the master unit side pin fixing hole 24 has an outer diameter of, for example, about 80 mm, and the slave unit side pin fixing hole 23 and the master unit pin fixing hole 23. It is a substantially cylindrical metal member having a length of, for example, about 165 mm that can be fitted over the machine-side pin fixing hole 24. Further, when the integrated anchor holding pin 25 is pushed outward until the portion on the rear end side in the pushing direction is detached from the child machine side pin fixing hole 23 so as to separate the child shield machine 15 from the parent shield machine 13. In addition, a rear end side fixing portion 25a fixed to the base unit side pin fixing hole 24 is configured, and further than the base unit side pin fixing hole 24 at the front end side in the pushing direction with respect to the rear end side fixing portion 25a. The portion protruding outward constitutes the distal anchor portion 25b (see FIG. 5).

  Further, in the present embodiment, the integrated holding anchor pin 25 is inserted into and fixed to the slave unit side pin fixing hole 23 and the master unit side pin fixing hole 24 which are matched with each other. A water-stopping O-ring 57 is interposed between the inner peripheral surface and the inner peripheral surface of the base unit side pin fixing hole 24, and is fitted into the pin fixing holes 23, 24. It is possible to firmly prevent water from flowing into the inside of the handset skin plate 16 from the gap between the integrated holding anchor pin 25 and the pin fixing holes 23, 24.

  Further, in the present embodiment, a plate locking notch 58 is formed in a concave shape on the side surface of the rear end portion in the pushing direction of the integrated holding anchor pin 25 so as to bite into the center side. The key plate 59 is fastened and fixed to the inner end face of the fixing hole reinforcing metal 53 via the fixing bolt 60 while the side of the rectangular flat plate key plate 59 is engaged with the locking notch 58 and engaged. The state in which the integrated holding pin 25 is fitted in the pin fixing holes 23 and 24 can be firmly held and fixed. Further, when the child machine skin plate 16 is separated from the parent machine skin plate 14, the fixing bolt 60 is removed and the key plate 59 is removed from the plate locking notch 58 to fix the integrated holding anchor pin 25 to the pin. It can be made to be in a state in which it can slide and extrude along the holes 23, 24 toward the ground outside the base unit skin plate 14.

  In this embodiment, when the child shield machine 15 is separated from the parent shield machine 13, as shown in FIGS. 4 (a) and 4 (b), for example, using an extruded jack 70, the integrated holding anchor pin 25 is used. Is pushed toward the outside of the master unit skin plate 14 so as to be detached from the slave unit side pin fixing hole 23, thereby fixing the rear end side fixing portion 25a to the master unit pin fixing hole 24 and the front end side anchor portion 25b. An anchor function can be exhibited by projecting so as to bite into the ground outside the base unit skin plate 14 (see FIG. 5).

  Here, as the extrusion jack 70, for example, a hydraulic jack composed of a linder part 71 and a piston part 72 can be used. The extrusion jack 70 is attached to and detached from the inner end face of the fixed hole reinforcing metal 53 by welding or the like, for example. The cordless handset skin plate 16 is supported and fixed to the support bracket 74 that can be attached, and the pressing portion 73 provided at the tip of the piston portion 72 is opposed to the rear end side end surface of the integrated holding anchor pin 25. Removably attached to the inside.

  In the present embodiment, when the integrated holding anchor pin 25 is pushed out by the extruded jack 70, it is interposed between the pressing portion 73 of the extruded jack 70 and the rear end side end surface of the integrated holding anchor pin 25, A water pin 75 is arranged. The water stop pin 75 has an outer diameter of, for example, about 80 mm, and is slightly longer than the length of the handset side pin fixing hole 23 formed in the fixing hole reinforcing metal 53, similarly to the integrated holding anchor pin 25. For example, it is a substantially cylindrical metal member having a length of about 110 mm. Further, a plate locking notch 76 is formed in a concave shape on the side surface of the rear end portion of the water stop pin 75 in the pushing direction so as to bite into the center side.

  To push out the integrated holding anchor pin 25 by the push-out jack 70, as shown in FIG. 4A, the key plate 59 is removed from the plate locking notch 58, and the integrated holding anchor pin 25 is inserted into the pin fixing hole 23. , 24, and the extrusion jack 70 is attached via the support bracket 74 in a state where the pressing portion 73 is opposed to the rear end side end surface of the integrated holding anchor pin 25, A water stop pin 75 is set between the pressing portion 73 and the rear end side end surface of the integrated holding anchor pin 25.

  Thereafter, as shown in FIG. 4B, by extending the piston portion 72 of the extrusion jack 70, the integrated holding anchor pin 25 is pushed out together with the water stop pin 75 toward the outside of the master skin plate 14. Then, the rear end side fixing portion 25a of the integrated holding anchor pin 25 is detached from the slave unit side pin fixing hole 23 and fixed to the master unit side pin fixing hole 24, and the front end side anchor portion 25b is fixed to the master unit skin plate. It protrudes so that it may bite into the ground outside 14 and exhibits an anchor function. Further, the water stop pin 75 following the rear end side fixing portion 25a is fitted into the handset side pin fixing hole 23 after the integrated holding anchor pin 25 is removed.

  Further, as shown in FIG. 5, the water stop pin 75 fitted in the handset side pin fixing hole 23 has a rectangular shape used in the above-described integrated holding anchor pin 25 in the plate locking notch 76. By engaging the side portions of the flat key plate 59 so as to be fitted, and fixing the engaged key plate 59 to the inner end face of the fixing hole reinforcing metal 53 via the fixing bolt 60, the pin fixing hole is fixed. The state in which the water stop pin 75 is fitted to 23 is firmly held. Accordingly, the child machine skin plate 16 of the child shield machine 15 can be advanced from the parent machine skin plate 14 of the parent shield machine 13 in a state where the anchor function for the parent machine skin plate 14 by the integrated holding anchor pin 25 is exhibited. Can be separated.

  And according to the middle folding type parent and child shield machine 10 having the above-described configuration, the child shield machine 15 and the parent shield machine 13 are integrated according to the following steps shown in FIGS. After digging to a predetermined position in the ground in the state, the child shield machine 15 can be separated from the parent shield machine 13 and the child shield machine 15 can be started with the parent shield machine 13 left in the ground. ing.

  That is, as shown in FIG. 11, the child shield machine 15 and the parent shield machine are arranged with the large-diameter segment 22a continuously arranged rearward from the large-diameter segment 22a to the position where the small-diameter segment 22b is switched as a predetermined position in the ground. When the folding parent-child shield machine 10 is excavated in an integrated state, the excavation operation is interrupted and the copy cutter 30 of the cutter head 17 is retracted to reduce the cutting diameter by the cutter head 17. Diameter. Further, for example, an injection material pressure feed pipe is connected to an injection material discharge hole provided in the base machine skin plate 14 or the child machine skin plate 16 so as to be opened and closed, and a known ground injection material is injected and solidified through the injection material discharge hole. By doing so, the ground around the base unit skin plate 14 is stabilized.

  Next, as shown in FIG. 12, in the front trunk portion 11, the integrated holding anchor pin 25 that integrates the front trunk base unit skin plate 14 a and the front trunk unit slave unit skin plate 16 a is provided with the master unit skin plate 14. By pushing the outer end side fixing portion 25a into the base unit side pin fixing hole 24 and by causing the front end side anchor portion 25b to dig into the outer ground and exhibit the anchor function, The base unit skin plate 14a is fixed to the surrounding ground. Further, by applying the filling pressure of the filler to the space between the front trunk base machine skin plate 14a and the front trunk slave machine skin plate 16a via the filler press fitting 40, the integrated front trunk master. The machine body skin plate 14a and the front body unit child machine skin plate 16a are trimmed so that the front body unit child machine skin plate 16a can be separated from the front body unit child machine skin plate 14a.

  After that, the child shield machine 15 (front trunk child machine skin plate 16a) in the front trunk part 11 and the rear trunk part in the rear trunk part 12 with the front trunk base machine skin plate 14a fixed on the surrounding ground. The base unit skin plate 14b and the rear trunk unit slave unit skin plate 16b are integrated together, and the base unit skin plate 14b is digged for a length of, for example, about 100 mm corresponding to the intermediate folding interval portion s (see FIG. 11). As a result, the rear trunk base machine skin plate 14b moves forward relative to the front trunk base machine skin plate 14a until the front end thereof abuts the rear end of the front trunk base machine skin plate 14a. The intermediate folding space portion s in the machine skin plate 14 is closed.

  When the middle folding interval portion s between the rear end of the front body base machine skin plate 14a and the front end of the rear body base machine skin plate 14b is closed, the rear body 12 As shown in FIG. 13, an integrated holding anchor pin 25 that integrates the rear trunk base unit splate 14b and the rear trunk unit slave unit skin plate 16b is pushed toward the outside of the master unit skin plate 14, and the rear end side thereof. The fixing unit 25a is fixed to the base unit side pin fixing hole 24, and the front side anchor unit skin plate 14b is attached to the surrounding ground by causing the front end side anchor unit 25b to dig into the outer ground and exhibit the anchor function. Let it settle. Further, by applying the filling pressure of the filler to the space portion between the rear trunk base machine skin plate 14b and the rear trunk slave machine skin plate 16b via the filler press fitting 40, the integrated rear trunk master. The machine body skin plate 14b and the rear body child machine skin plate 16b are bordered so that the rear body child machine skin plate 16b can be separated from the rear body mother machine skin plate 14b.

  As a result, the front trunk unit skin plate 16a and the rear trunk unit skin plate 16b can be separated from the front trunk unit skin plate 14a and the rear trunk unit skin plate 14b. As shown in FIG. 13, the shield jack 20 is extended while the spacer 63 is assembled and interposed between the front end of the large-diameter segment 22a installed inside the rear trunk base skin plate 14b. The child machine skin plate 16 (the front trunk child machine skin plate 16a and the rear trunk child machine skin plate 16b) while the trunk master machine skin plate 14a and the rear trunk master machine skin plate 14b are fixed to the surrounding ground. It is possible to dig up the child shield machine 15 while only moving forward.

  When the child shield machine 15 is dug until the shield jack 20 is fully extended, the shield jack 20 is contracted, and the tail part is located behind the rear trunk child machine skin plate 16b in the rear trunk parent machine skin plate 14b. The operation of joining and integrating the handset skin plate 16c is performed.

  In order to join and integrate the tail unit slave unit skin plate 16c behind the rear trunk unit skin plate 16b, as shown in FIG. 14, the spacer 63 is disassembled and removed inside the rear trunk unit base unit skin plate 14b. Is done. Further, in the region from the middle part of the rear trunk base machine skin plate 14b to the front end edge joined to the rear end of the front trunk master machine skin plate 14a, the tail part slave machine skin plate 16c is overlapped. As for the part, the back injection pipe 47 of the base unit simultaneous back injection unit 46 and the part sandwiched by the legs of the protective cover 48 of the rear body base unit skin plate 14b are removed, and the rear body passage groove 49 is formed (see FIGS. 7A and 7B).

  Further, as shown in FIG. 15, the shield jack 20 is moved slightly inward in the radial direction, and the tail child machine skin is placed between the shield jack 20 and the inner peripheral surface of the rear trunk master skin plate 14b. After forming a space for inserting the front end portion of the plate 16c along the inner side of the rear trunk main unit skin plate 14b, the tail unit slave unit skin plate 16c is inserted into the formed space while inserting the front end portion. Assemble along the inner peripheral surface of the machine skin plate 14b. Further, by joining the front end of the inserted tail unit slave unit skin plate 16c to the rear end of the rear unit slave unit skin plate 16b by welding or the like, the tail unit slave unit skin plate 16c and the rear unit slave unit skin plate 16b Is integrated. Further, the in-machine water stop component 45 (see FIG. 14) attached to the rear end of the rear trunk unit skin plate 16b is removed.

  Here, the tail child machine skin plate 16c is made of a cylindrical steel plate having a thickness of about 36 mm, for example, like the rear trunk child machine skin plate 16b, and is slightly larger than the outer diameter of the small diameter segment 22b. It has an inner diameter of about 5140 mm and an outer diameter of, for example, about 5212 mm, and is attached to the rear of the rear body slave unit skin plate 16b by extending to a length of, for example, 3700 mm.

  Further, the tail unit slave unit skin plate 16c includes a main unit simultaneous back-injection device 46 provided on the upper part of the rear trunk unit master unit skin plate 14b and an upper trunk unit base unit skin plate 14a. As shown in FIGS. 2 and 10 (a) and 10 (b), at the positions corresponding to the notch passage groove 41 and the passage groove cover body 42 provided in the upper part, the same as the base unit simultaneous back-injection device 46. The slave unit simultaneous back-injection device 50 having the configuration of the back-injection pipe 51 and the protective cover 52 extends in the axial direction along the outer peripheral surface of the tail unit slave unit skin plate 16c at two locations. Is provided. Further, at the rear end portion of the tail unit slave unit skin plate 16c, there are three ring-shaped tail seals 64 arranged along the inner peripheral surface of the tail unit slave unit skin plate 16c at intervals in the axial direction. It is attached.

  Then, the tail unit slave unit skin plate 16c allows the slave unit simultaneous back-injection device 50 to pass through the notch passage groove 41 and the rear trunk unit passage groove 49, and the front trunk unit skin plate 14a and the rear trunk unit. While projecting to the outside of the machine skin plate 14b, the slave unit simultaneous back-injecting device 50 is disposed inside the passage groove cover body 42 and the protective cover 52 (see FIGS. 10A and 10B). The rear body slave unit skin plate 16b is arranged behind the rear trunk unit slave unit skin plate 16b. The front end of the rear trunk unit slave unit skin plate 16b is welded and fixed to the rear end of the rear trunk unit slave unit skin plate 16b. The rear trunk portion of the child shield machine 15 that can be folded with respect to the front trunk child machine skin plate 16a is configured.

  When the tail unit slave unit skin plate 16c is joined and integrated to the rear of the rear trunk unit slave unit skin plate 16b, as shown in FIG. 16, as the work inside the tail unit slave unit skin plate 16c, The small-diameter segment 22b is assembled by connecting to the front of the large-diameter segment 22a installed inside the plate 14b. Such an assembly operation of the small-diameter segment 22b can be easily performed by using the erector 21 and the work deck 37 provided to extend inside the tail unit slave unit skin plate 16c.

  When the small-diameter segment 22b is continuously assembled to the portion immediately after the contracted shield jack 20, as shown in FIG. 17, the reaction force is taken from the assembled small-diameter segment 22b and the shield jack 20 is extended while the child shield is extended. The child shield machine 15 is started from the master machine skin plate 14 left in the ground by excavating the machine 15.

  Here, when the child shield machine 15 is started and the child machine skin plate 16 is moved forward with respect to the parent machine skin plate 14, the child provided to protrude from the outer peripheral surface of the tail child machine skin plate 16c. As shown in FIGS. 10 (a) and 10 (b), the machine simultaneous back-injecting device 50 includes a rear trunk part passage groove 49 covered by a protective cover 48 of the rear trunk part main body skin plate 14b, and a front trunk part. By moving along the notch passage groove 41 covered by the passage groove cover body 42 of the main body skin plate 14a, the rear body main body skin plate 14b and the front body main body skin plate 14a are not buffered. It becomes possible to move forward. When the distal end of the slave unit simultaneous back-injecting device 50 reaches the distal end portion of the passage groove cover body 42, the passage groove cover body 43 is rotated while being rotated so as to push up the flap-type lid member 43 provided at the distal end portion. By opening the front end portion of 42, the slave unit simultaneous back-injecting device 50 can be passed smoothly from the front end portion of the front trunk unit main body skin plate 14a toward the front thereof (FIG. 17). reference).

  When the child shield machine 15 is started from the parent shield machine 13 as described above, as shown in FIG. 2, only the child shield machine 15 is engraved according to the same work process as that of the known shield method. The shield tunnel by the small diameter segment 22b whose outer diameter is smaller than the segment 22a will be constructed sequentially.

  And according to the underground starting method of the middle folding type parent-and-child shield machine 10 having the above-described configuration, the middle folding interval of the middle folding type parent shield machine 13 left at a predetermined position in the ground It is possible to dig only the folding child shield machine 15 in a stable state while blocking the portion s to avoid leakage of water inside the parent shield machine 13 and the child shield machine 15.

  That is, according to the starting method of the middle folding type parent-child shield machine 10 according to the present embodiment, after the shield machine 10 is dug to a predetermined position in the ground, the front trunk base machine skin plate 14a is placed on the surrounding ground. In addition to fixing, the front body child machine skin plate 16a and the front body parent machine skin plate 14a can be separated, and the front body child machine skin plate 16a, the rear body parent machine skin plate 14b, and the rear body child The machine skin plate 16b is integrated with the machine skin plate 16b, and the front end of the rear trunk base machine skin plate 14b comes into contact with the rear end of the front trunk base machine skin plate 14a. To close the middle folding interval portion s in the main body skin plate 14, and then fix the rear trunk main body skin plate 14b to the surrounding ground, The child machine skin plate 16b and the rear trunk main machine skin plate 14b can be separated from each other, and the front trunk child is maintained while the front trunk master machine skin plate 14a and the rear trunk master machine skin plate 14b are fixed in the ground. Since the child shield machine 15 is advanced while the machine skin plate 16a and the rear trunk child machine skin plate 16b are advanced as a unit, the folding interval of the parent machine skin plate 14 left at a predetermined position in the ground It is possible to easily and surely block the portion s and to dig only the child shield machine 15 in a stable state while avoiding the occurrence of water leakage inside the parent shield machine 13 and the child shield machine 15. Become.

  Further, according to the parent-child shield machine 10 of the present embodiment having the above-described configuration, when the child shield machine is started from the parent shield machine, the skin plate of the parent shield machine follows the child shield machine. This can be effectively avoided with a simple configuration.

  That is, according to the parent-child shield machine 10 of the present embodiment, the child shield machine 15 and the parent shield machine 13 are integrated with each other by the plurality of child machine side pin fixing holes 23 formed in the child machine skin plate 16 and the parent machine. The plurality of base unit side pin fixing holes 24 formed in the skin plate 14 are matched with each other, and the integrated holding pin 25 is fitted in a state in which the integrated holding pin 25 can be slide-extruded. When the child shield machine 15 is separated from the parent shield machine 13, it is pushed out of the parent machine skin plate 14 so as to be disengaged from the child machine side pin fixing hole 23, and the rear end side fixing portion 25a is fixed to the parent machine pin. Since the tip side anchor portion 25b protrudes into the ground outside the base unit skin plate 14 while being fixed to the hole 24, the base unit skin plate 14 When the child shield machine 15 is advanced by the anchor function for the master machine skin plate 14 by the tip side anchor portion 25b of the integrated holding anchor pin 25 arranged so as to protrude from the ground on the side, the master machine skin plate 14 is moved to the child shield. It is possible to effectively avoid the accompanying movement following the machine 15 with a simple configuration.

  The present invention is not limited to the above-described embodiment, and various modifications can be made. For example, the folding type parent-child shield machine that is applied to the ground start method of the present invention does not necessarily need to be a muddy water type shield machine, and other types of middle type, such as earth pressure type shield machine The parent-child shield machine may be used. In addition, the method of fixing the front torso base machine skin plate and the rear torso base machine skin plate to the surrounding ground does not necessarily have to be by projecting the integrated holding anchor pin to the surrounding ground. Other methods such as injection may be used. Furthermore, the parent-child shield machine that fixes the parent machine skin plate to the surrounding ground by the anchor function of the integral holding anchor pin may be a shield machine other than the middle folding type that does not include the middle folding jack.

(A) is a longitudinal cross-sectional view explaining the structure of the folding parent-child shield machine which the starting method based on preferable one Embodiment of this invention is applied, (b) is a front view. It is a longitudinal cross-sectional view explaining the state made to dig only with a child shield machine of the folding type parent and child shield machine applied with the starting method according to a preferred embodiment of the present invention. 1A is an enlarged cross-sectional view of part A of FIG. 1A, FIG. 1B is a top view of FIG. 1A viewed from above, and FIG. 1C is a state of FIG. It is an A section expanded sectional view. (A), (b) is sectional drawing explaining the condition which extrudes an integrated holding pin toward the outer side of the main | base_machine skin plate. FIG. 10 is a cross-sectional view illustrating a state in which the integrated holding pin is pushed toward the outside of the master unit skin plate and the slave unit skin plate can be separated from the master unit skin plate. It is the B section expanded sectional view of Drawing 1 (a). It is the C section expanded sectional view of Drawing 1 (a). (A) is a cross-sectional view for explaining a notch passage groove and a passage groove cover provided on the upper part of the front trunk base machine skin plate, and (b) is a longitudinal sectional view. (A) is an expanded sectional view along DD of FIG. 1 (a), (b) is an expanded sectional view along D'-D 'of FIG. (A) is an enlarged sectional view for explaining a situation in which the slave unit simultaneous back-injecting device is moved along a notch passage groove provided on the upper part of the front trunk unit skin plate, and (b) is a rear trunk unit. It is an expanded sectional view explaining the condition which moves a subunit | mobile_unit simultaneous back injection apparatus along the back trunk | drum passage groove | channel formed in the upper part of an apparatus skin plate. It is a schematic longitudinal cross-sectional view explaining the process of separating and digging a child shield machine from a parent shield machine. It is a schematic longitudinal cross-sectional view explaining the process of separating and digging a child shield machine from a parent shield machine. It is a schematic longitudinal cross-sectional view explaining the process of separating and digging a child shield machine from a parent shield machine. It is a schematic longitudinal cross-sectional view explaining the process of separating and digging a child shield machine from a parent shield machine. It is a schematic longitudinal cross-sectional view explaining the process of separating and digging a child shield machine from a parent shield machine. It is a schematic longitudinal cross-sectional view explaining the process of separating and digging a child shield machine from a parent shield machine. It is a schematic longitudinal cross-sectional view explaining the process of separating and digging a child shield machine from a parent shield machine.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Folding type parent and child shield machine 11 Front trunk part 12 Rear trunk part 13 Parent shield machine 14 Parent machine skin plate 14a Front trunk parent machine skin plate 14b Rear trunk parent machine skin plate 15 Child shield machine 16 Child machine skin plate 16a Front torso slave unit skin plate 16b Rear torso slave unit skin plate 16c Tail unit slave unit skin plate 17 Cutter head 18 Compartment 19 Excavation earth discharging device 20 Shield jack 21 Segment assembly unit 22a Large diameter segment 22b Small diameter segment 23 Child machine side pin fixing hole 24 Master machine side pin fixing hole 25 Integrated holding anchor pin 25a Rear holding side fixing part 25b of integrated holding anchor pin Front side anchor part 30 of integrated holding anchor pin Copy cutters 53 and 54 fixed Hole reinforcement 70 Extruded jack 71 Linder 72 Fixie Part 73 pressing portion 74 supporting bracket 75 water stop pin s center bending pitch area

Claims (3)

The foldable child shield machine equipped with a cutter head capable of expanding and reducing the cutting diameter, compartment, excavated earth and sand transporting device, shield jack, and segment assembly device is replaced with the main body skin plate of the foldable parent shield machine. Arranged concentrically so as to be separable inside, after digging to a predetermined position in the ground in an integrated state of the child shield machine and the parent shield machine, the child shield machine is separated from the parent shield machine By digging only with the child shield machine, it is a ground starting method of a folding parent-child shield machine that forms a shield tunnel in which the outer diameter of the segment changes in the middle,
The master unit skin plate is composed of a front trunk unit master unit skin plate and a rear trunk unit master unit skin plate that are arranged continuously with a middle folding interval portion interposed therebetween. It consists of a front torso child machine skin plate and a rear torso child machine skin plate that are arranged continuously with an interval part interposed,
In addition, the front trunk base unit skin plate and the front trunk unit slave unit skin plate of the front trunk unit, and the rear trunk unit base unit skin plate and the rear trunk unit slave unit skin plate of the rear trunk unit are separated from each other. Integrated as possible,
After digging up to a predetermined position in the ground in a state where these are integrated, in the front torso, the front torso base unit skin plate is fixed to the surrounding ground to prevent movement, and the front torso A step of releasing the integration of the child machine skin plate and the front body master machine skin plate and separating them;
With the front trunk base machine skin plate fixed, the front trunk slave machine skin plate of the front trunk section, the rear trunk master machine skin plate of the rear trunk section, and the rear trunk slave machine skin plate As a unit, by advancing the length corresponding to the intermediate folding interval portion, the front end of the rear trunk base machine skin plate is advanced until it contacts the rear end of the front trunk base machine skin plate, A step of closing a middle folding interval portion in the base unit skin plate;
In the rear torso, the rear torso master unit skin plate is fixed to the surrounding ground so that it does not move, and the rear torso slave unit skin plate and the rear torso master unit skin plate are unintegrated. The process of making them separable,
Thereafter, the front trunk unit skin plate and the rear trunk unit skin plate are moved forward together while the front trunk unit skin plate and the rear trunk unit skin plate are fixed in the ground. A ground-breaking method of the center-foldable parent-child shield machine including the step of excavating the child shield machine. Integration of the front torso base unit skin plate and the front torso unit slave unit skin plate, and integration of the rear torso unit base unit skin plate and the rear torso unit slave unit skin plate are the front torso unit. A plurality of slave unit side pin fixing holes formed in the slave unit skin plate or the rear trunk unit slave plate, and the front trunk base unit skin plate or the rear trunk unit corresponding to the slave unit side pin fixing hole A plurality of base unit side pin fixing holes formed in the base unit skin plate are respectively matched to each other, and an integrated holding anchor pin is fitted and fixed. It is fitted so as to be able to slide and extrude toward the outer ground of the master machine skin plate or the back trunk master machine skin plate,
In addition, the integrated holding anchor pin is configured so that the front body base machine skin plate or the rear body base machine skin is detached from the handset side pin fixing hole when the slave shield machine is separated from the master shield machine. Extruded to the outside of the plate, the rear end side fixing portion is fixed to the base unit pin fixing hole, and the front end side anchor portion is outside the front trunk unit main unit skin plate or the rear trunk unit main unit skin plate The middle-folding parent and child according to claim 1, wherein the front trunk base skin plate or the rear trunk base skin plate is fixed to the surrounding ground by protruding so as to bite into the ground of the base and exhibiting an anchor function. Underground starting method for shield machine. A child shield machine equipped with a cutter head capable of expanding and reducing the cutting diameter, a compartment, an excavating earth and sand carrying device, a shield jack, and a segment assembling device is disposed concentrically in a detachable manner inside the master skin plate, After digging to a predetermined position in the ground in a state where the child shield machine and the parent shield machine are integrated, the child shield machine is separated from the parent shield machine and dug only with the child shield machine. In a parent-child shield machine that forms a shield tunnel whose outer diameter changes midway,
Integration of the child shield machine and the parent shield machine is formed in the master machine skin plate corresponding to the plurality of slave machine side pin fixing holes formed in the slave machine skin plate and the slave machine side pin fixing holes. The plurality of base unit side pin fixing holes are matched with each other, and the integrated holding anchor pin is fitted and fixed,
The integrated holding anchor pin is fitted so as to be slidable and extrudable toward the ground outside the base unit skin plate,
The integrated holding anchor pin is pushed to the outside of the master unit skin plate so as to be detached from the slave unit side pin fixing hole when the slave shield unit is separated from the master shield unit, and a rear end side fixing unit Is fixed to the base unit pin fixing hole, and the front-end anchor portion protrudes so as to bite into the ground outside the base unit skin plate and exhibits an anchor function.

Images