JP4780425B2 - Shield machine - Google Patents

Description

  The present invention relates to a shield machine for constructing a tunnel.

  As shown in FIG. 17, the segment assembly simultaneous excavation shield machine 40 assembles the cutter unit 41 for excavating earth and sand, the front trunk part 40a, the rear trunk part 40b, and the segment 20 to form the tunnel wall surface 42. An erector 43 for propulsion, a propulsion jack 44 for obtaining a thrust by applying a reaction force to the rear trunk, and a holding jack 47 for transmitting the thrust of the propulsion jack 44 to the segment 20.

  A number of the jacks 44 for propulsion are provided circumferentially within the machine body 45, and the cutter unit 41 is pressed against the earth and sand in the excavation direction 46 by extending the jacks 44 for propulsion, and is rotated or rocked. 41 is excavating earth and sand.

  Moreover, the assembly work of the segment 20 is performed in parallel with the excavation of the shield machine 40.

  Specifically, when the front barrel 40a is digging with the propulsion jack 44, the rear barrel 40b is stopped, and the segment 20 is to be assembled among the holding jacks 47 provided in a large number around the circumference. Only the position holding jack 47 is retracted, and the segment 20 is assembled by the erector 43 while the thrust is held by the other holding jack 47.

JP-A-6-212878

  By the way, since the above-described segment assembly simultaneous excavation shield machine 40 retracts the holding jack 47 at the position where the segment 20 is assembled, the balance is easily lost and it is difficult to accurately control the excavation direction. There was a problem. Further, the above-described segment assembly simultaneous excavation shield machine 40 has been required to increase the excavation speed to shorten the construction period and reduce the excavation cost.

  As a technique for increasing the straight running accuracy and the excavation speed, there is a shield excavator described in JP-A-6-212878 (Japanese Patent Application No. 5-23151).

  As shown in FIG. 18, this shield machine 130 assembles the segment 133 in the outer shield 132 while only the inner shield 131 is advanced, and after the inner shield 131 has been excavated for a predetermined distance, Only the outer shield 132 is dug.

  The inner shield 131 that has been excavated first advances straight while being guided in the direction of excavation by the outer shield 132, and the outer shield 132 that is excavated later is guided by the inner shield 131 that has pierced the natural ground and advances straight. Therefore, you can go straight ahead accurately.

  Further, since the inner shield 131 is dug while assembling the segment 133, the dug speed can be increased to some extent.

  However, since the inner peripheral shield 131 is guided by the inner peripheral surface 134 of the outer peripheral shield 132, the digging direction cannot be changed, and the outer peripheral shield 132 is advanced after the inner peripheral shield 131 is advanced in advance. For this reason, even if the direction of excavation is to be changed, the inner periphery shield 131 is caught on the ground and it is difficult to excavate the curve.

  In addition, since a large number of cutter bits cannot be provided on the same circumference and the inner circumference shield 131 having a relatively low excavation capability is caused to make a difficult advance excavation, the advance excavation takes time and there is room for improvement. .

  Accordingly, an object of the present invention is to provide a shield machine capable of solving the above-described problems, excavating with a good balance, easily excavating curves with high accuracy, and excavating at high speed.

  To achieve the above object, the present invention provides a ring-shaped penetrating hood, a hood propulsion jack that is provided in the penetrating hood and takes the reaction force from an existing segment and advances the penetrating hood by at least one ring of the segment, An inner peripheral shield provided on the inner periphery of the penetrating hood so as to freely advance and retreat, and an erector provided on the penetrating hood and for assembling segments while the inner peripheral shield is being excavated.

In short, according to the present invention, the following excellent effects can be obtained.
(1) The shield machine can be dug in a well-balanced manner, and the direction can be easily controlled with high accuracy.
(2) The shield machine can be made simple and does not require particularly complicated balance control.
(3) The shield machine can be driven at high speed.

It is explanatory drawing of the shield construction method which shows the reference form used as the premise of this invention. It is a side view of a shield machine. FIG. 3 is a front view of FIG. 2. It is a side view of the shield machine of FIG. 2 in a state where the inner shield is being dug. It is a side view of the shield machine which shows another reference form. FIG. 6 is a front view of FIG. 5. FIG. 7 is a sectional view taken along line VII-VII in FIG. 5. FIG. 6 is a side view of the shield machine of FIG. 5 with the outer shield shielded. It is a side view of the shield machine which shows another reference form. FIG. 10 is a cross-sectional view taken along line XX in FIG. 9. It is a side view of the shield machine which shows another reference form. FIG. 12 is a cross-sectional view taken along line XII-XII in FIG. 11. It is a side view of the shield machine which shows embodiment of this invention. FIG. 14 is a side view of the shield machine of FIG. 13 in a state where the outer shield is dug. FIG. 14 is a side view of the shield machine of FIG. 13 in a state where the inner peripheral shield is being dug. It is explanatory drawing of the cycle time of a shield machine. It is a side view of the conventional shield machine. It is a side view of the conventional shield machine.

  A reference embodiment as a premise of the present invention will be described in detail with reference to the accompanying drawings.

  As shown in FIG. 2, the shield machine 1 includes a ring-shaped outer periphery shield 2 and an inner periphery shield 3 provided on the inner periphery of the outer periphery shield 2 so as to freely advance and retract.

  The outer periphery shield 2 includes a front body portion 6 having an outer periphery cutter 5 and a rear body portion 7 that is flexibly connected to the front body portion 6.

  As shown in FIGS. 2 and 3, the outer cutter 5 is formed in a ring shape, and is provided at the front end of the front barrel 6 so as to be swingable or rotatable via a swinging jack 8 or a drive motor. . The outer cutter 5 has a large number of spokes 9 extending radially, and each of the spokes 9 is provided with a large number of cutter bits 10 arranged on the same circumference. As a result, the outer cutter 5 has a higher cutting ability than the inner cutter 11 described later.

  A first mud feed pipe 13 and a first mud discharge pipe 14 are connected to the outer cutter room 12 formed on the back side of the outer cutter 5.

  The front body portion 6 has an inner peripheral wall 15 that seals the inner periphery and guides an inner periphery shield 3 described later in a slidable manner. The inner peripheral wall 15 is provided with a ring-shaped seal member 16 that is in close contact with the inner peripheral shield 3 and seals between the inner peripheral wall 15 and the inner peripheral shield 3.

  The rear trunk portion 7 has a connecting portion 17 that is fitted into the front barrel portion 6 on the outer periphery of the front end portion. The connecting portion 17 is formed to be curved in a spherical shape and can be rotated in the front body portion 6.

  In addition, a middle-folded jack 18 is provided between the front trunk portion 6 and the rear trunk portion 7, and the front trunk portion 6 is bent with respect to the rear trunk portion 7 by expanding and contracting the middle-fold jack 18. It has become.

  The rear trunk portion 7 is provided with an outer peripheral propulsion jack 21 for taking the reaction force from the existing segment 19 and advancing the outer peripheral shield 2 by one ring of the segment 20 and an erector 22 for assembling the segment 20. .

  The outer peripheral propulsion jack 21 is composed of a hydraulic cylinder having a stroke corresponding to at least one ring of the segment 20, and is provided in a large number on the inner periphery of the front end portion of the rear trunk portion 7 with the piston rod 23 facing rearward. It has been. Then, by extending the piston rod 23 toward the existing segment 19 at the rear side, the existing segment 19 is pushed rearward to take a reaction force.

  The erector 22 moves on the inner peripheral side of the outer peripheral propulsion jack 21 in the rear trunk portion 7 along the rail 25 and the ring-shaped rail 25 provided coaxially with the rear trunk portion 7. It comprises an assembly device 26 for assembling the segment 20 so as to be added to the front end of the existing segment 19, and the segment 20 is assembled while the inner peripheral shield 3 is being excavated.

  The inner peripheral shield 3 is connected to the front body portion 6 of the outer periphery shield 2 via an inner periphery propulsion jack 28 and is provided so as to be able to advance and retreat in the front body portion 6. The inner peripheral shield 3 includes an inner body portion 29 that advances and retreats along the inner peripheral wall 15 of the outer periphery shield 2, and an inner periphery cutter 11 that is rotatably provided on the inner body portion 29.

  The inner body portion 29 is formed sufficiently shorter than the front body portion 6 of the outer periphery shield 2. Even if the inner periphery propulsion jack 28 described later is retracted and retracted into the outer periphery shield 2, the inner body portion 29 is sufficiently in the front body portion 6. It comes to fit.

  The inner peripheral propulsion jack 28 is composed of a hydraulic cylinder having a stroke corresponding to one ring of the segment 20. One end of the inner peripheral propulsion jack 28 is fixed to the inner side of the inner trunk portion 29 and the other end is fixed to a support member 31 that protrudes inward from the rear portion of the outer peripheral shield 2. The excavation surface of the peripheral cutter 11 is advanced to the position of the excavation surface of the outer cutter 5.

  When the outer peripheral propulsion jack 21 is extended, the inner peripheral propulsion jack 28 is retracted from the extended state at the same speed as the extension speed, and when the outer peripheral shield 2 is stopped, the inner peripheral shield 3 is moved to the outer peripheral shield 2. It extends to dig up to the position of.

  The total thrust of the outer peripheral propulsion jack 21 is selected to be larger than the total thrust of the inner peripheral propulsion jack 28.

  The inner peripheral cutter 11 is formed by providing cutter bits 34 radially on a disc-shaped cutter face plate 33, and is driven to rotate by a drive motor 35 provided in the inner trunk portion 29.

  A second mud pipe 37 and a second mud pipe 38 are connected to the inner cutter chamber 36 formed on the back side of the inner cutter 11.

  Next, the operation will be described.

  As shown in FIG. 1 (a), the outer peripheral cutter 5 is driven from the state in which the outer peripheral cutter 5 and the inner peripheral cutter 11 are combined, and the outer peripheral propulsion jack 21 is extended while the inner peripheral propulsion jack 28 is extended. Degenerate at the same speed as the extension speed of 21. The outer peripheral propulsion jack 21 pushes the existing segment 19 rearward, and the outer peripheral shield 2 is dug by the reaction force.

  At the same time, the inner peripheral shield 3 stops in place while receiving the earth pressure from the front of the inner peripheral cutter 11 by retracting the inner peripheral propulsion jack 28.

  At this time, since the outer peripheral shield 2 is dug using all the outer peripheral propulsion jacks 21 provided at equal intervals in the circumferential direction, the outer shield 2 can be dug in a balanced manner. For example, when the outer peripheral shield 2 is moved straight forward, it is only necessary to supply the hydraulic pressure evenly to all the outer peripheral propulsion jacks 21. When the outer peripheral shield 2 is advanced, only the balance of the hydraulic pressure supplied is biased according to the direction and diameter of the curve. The direction can be easily controlled in both the straight construction and the bending construction.

  Further, as shown in FIG. 3, the outer cutter 5 is formed in a ring shape and is separated from the inner cutter 11 whose peripheral speed is slow and a large number of cutter bits 10 cannot be provided on the same circumference. Therefore, high-speed excavation can be easily performed.

  That is, since the outer cutter 5 is composed only of a portion having a long distance from the rotation center, the peripheral speed at the time of rotation is faster than that of the inner peripheral cutter 11, and the peripheral length is long. A large number of bits 10 can be provided, and the excavation amount per unit rotation angle can be easily set to be large, and high-speed excavation can be performed.

  When the outer peripheral propulsion jack 21 is extended by one ring of the segment 20, the outer peripheral propulsion jack 21 is stopped expanding and contracting and the outer cutter 5 is stopped driving, and the outer peripheral shield 2 is stopped. At this time, as shown in FIG. 1B, the outer peripheral shield 2 is advanced by one ring of the segment 20, and the erector 22 in the rear trunk portion 7 is also moved forward by one ring of the segment 20.

  In this state, the segment 20 is assembled while the inner peripheral shield 3 is being advanced.

  The inner circumference shield 3 is dug by extending the inner circumference propulsion jack 28 while rotating the inner circumference cutter 11.

  As shown in FIGS. 1C and 4, the inner shield 3 simply digs linearly in the outer shield 2 in the direction toward the outer shield 2, so that it is easy to perform without any direction control. Can dig into.

  Further, since the inner peripheral shield 3 only advances while excavating the slightly loosened earth and sand in the outer peripheral shield 2, it is more than the case where the inner peripheral shield 131 is advanced ahead as in the shield machine 130 shown in FIG. It can be easily excavated, and can be excavated almost at a constant speed without being affected by the quality of the sediment.

  Since the inner shield 3 is dug in parallel with the time-consuming segment assembly operation, it is not necessary to dig as fast as the outer shield 2 and may be completed by the end of the segment assembly.

  Since the earth and sand excavated by the inner shield 3 is surrounded by the outer shield 2, the inner shield 3 can be dug in a state where the face is stabilized so as to substantially follow the front end face of the outer shield 2. .

  The assembly of the segments 20 is sequentially performed in the circumferential direction.

  Specifically, among the outer peripheral propulsion jacks 21 arranged in the circumferential direction, only the outer peripheral propulsion jack 21 at the position where the segment 20 is assembled is degenerated, and a space for assembling the segment 20 is secured in front of the existing segment 19. A series of operations of assembling the segment 20 at the position by the elector 22 is performed while sequentially moving the assembly position in the circumferential direction.

  At the position where the segment 20 is assembled, the outer peripheral propulsion jack 21 is extended again, and the newly assembled segment 20 is pressed backward to obtain a reaction force.

  During this period, the outer peripheral propulsion jack 21 at the segment assembly position is degenerated. However, since the outer peripheral shield 2 is held by the ground, the outer peripheral shield 2 is not out of balance even if the inner peripheral shield 3 is dug. Absent. The inner peripheral shield 3 is dug linearly by obtaining a stable reaction force from the outer peripheral shield 2.

  As shown in FIG. 1A, when the inner peripheral shield 3 is dug and the inner peripheral cutter 11 reaches the position of the outer peripheral cutter 5, the rotational drive of the inner peripheral cutter 11 is stopped and the inner peripheral propulsion jack 28 is stopped. Is stopped and the inner shield 3 is stopped.

  Then, the tunnel 39 is constructed by sequentially excavating the outer peripheral shield 2 and the inner peripheral shield 3 alternately.

  When the tunnel 39 is bent (curved), it is dug using a copy cutter (not shown) provided on the outer cutter 5 while changing the direction of the front barrel 6 by appropriately extending or retracting the bent jack 18. Then, the segments for curve construction (not shown) are assembled sequentially.

  At this time, since all the curves of the tunnel 39 are determined by controlling the excavation direction of the outer peripheral shield 2, the control of the excavation direction is not performed while assembling the segments 20. The obtained reaction force can be obtained, and accurate direction control can be easily performed.

  In this way, after taking the reaction force from the existing segment 19, the outer peripheral shield 2 is advanced for at least one ring of the segment 20, and then the outer peripheral shield 2 is stopped and the reaction force is taken from the stopped outer peripheral shield 2 to take the inner force. Since the circumferential shield 3 is dug up to the position of the outer circumference shield 2 and the segment 20 is assembled between them, the shield machine 4 can always be dug in a well-balanced manner without performing complicated balance control. Curves can be easily performed, and direction control can be easily performed with high accuracy.

  Further, as shown in FIG. 16, after the outer shield 2 is dug at a high speed 120 and a segment assembling space is formed in a short time, the inner shield 3 which is difficult to be dug at a high speed is dug within the segment assembling time while the segment is assembled 121. 122, the time-consuming segment assembly work and the inner shield 3 excavation work can be performed in parallel, and high-speed excavation can be performed.

  In particular, since the outer shield 2 having a high excavation capability is suitable for high speed excavation, the inner shield 3 having a lower excavation capability can be advanced at a more stable speed than the preceding excavation. Because the inner shield 3 is dug in the ground that has been excavated and slightly loosened, the inner shield 3 with low excavation ability can be easily dug at a constant speed, and stable high-speed excavation can be performed. be able to.

  Then, during the excavation of the inner peripheral shield 3, the outer peripheral propulsion jack 21 at the position where the segment 20 is assembled is retracted from the circumferential outer peripheral propulsion jack 21 in the extended state so that the segment 20 is assembled. Since the outer peripheral propulsion jack 21 is degenerated in a held and stable state, the degeneration of the outer peripheral propulsion jack 21 hardly affects the balance between the outer peripheral shield 2 and the inner peripheral shield 3, and the shield machine 4 is always excavated stably. Can be made.

  Further, the outer peripheral shield 2 is constituted by a front body portion 6 having an outer periphery cutter 5 and a rear body portion 7 having an erector 22, and the front body portion 6 and the rear body portion 7 can be bent through a bendable jack 18. The inner periphery shield 3 is provided on the front body portion 6 so as to be able to advance and retreat, and the front body portion 6 is bent together with the inner periphery shield 3 with respect to the rear body portion 7 at the time of bending work. The outer shield 2 that is advantageous for the construction can determine the direction in which the inner shield 3 is advanced, and the bending construction can be performed easily and accurately.

  The shield machine 4 is provided on the outer periphery shield 2, and the outer periphery propulsion jack 21 that takes the reaction force from the existing segment 19 and advances the outer periphery shield 2 by at least one ring of the segment 20, the outer periphery shield 2, and the inner periphery When the outer peripheral propulsion jack 21 is extended, the outer peripheral propulsion jack 21 is retracted from the extended state, and when the outer peripheral shield 2 is stopped, the inner periphery is extended to dig up the inner peripheral shield 3 to the position of the outer peripheral shield 2. Since the propulsion jack 28 and the erector 22 that is provided on the outer peripheral shield 2 and assembles the segment 20 during the excavation of the inner peripheral shield 3 are provided, the above-described shield method can be easily realized, and particularly complicated. It can be a simple one that does not require balance control, and can be easily dug at a high speed.

  Further, since the outer cutter 5 is speeded up as a multi-strip cutting arrangement and the segment assembly space is secured in a short time, the inner shield 3 is dug within a relatively time-consuming segment assembly time. The construction period can be greatly shortened.

  In addition, although the outer periphery shield 2 was dug for 20 minutes per segment, the inner shield 3 was dug. However, the present invention is not limited to this, and the outer shield 2 is dug for 20 min. The assembly space may be secured, and the segment 20 in the assembly space may be assembled while the inner circumferential shield 3 is being excavated. In this case, the erector 22 is preferably movable in the front-rear direction.

  Moreover, although the above-mentioned reference form demonstrated the folding type shield machine, it is not restricted to this. Even in a shield machine that does not break, it is possible to dig a curve in an arbitrary direction by partially biasing the driving force of the outer peripheral jack 21. At this time, the curvature of the curve can be determined by adjusting the bias of the driving force.

  Other reference forms will be described.

  In the shield machine 50 shown in FIG. 5, the outer cutter 5 of the shield machine 4 is changed from the swing type to the rotary type, and the outer shield 2 and the inner shield 3 are changed in order to shorten the length of the machine. It is a thing. In particular, the description of the same configuration as the shield machine 4 described above is omitted, and the same reference numerals are given to the drawings.

  The shield machine 50 includes an outer peripheral shield 51 formed in a substantially ring shape, and an inner peripheral shield 53 provided on the inner periphery of the front body portion 52 of the outer peripheral shield 51 so as to freely advance and retract.

  The outer peripheral shield 51 includes a front body portion 52 and a rear body portion 54 that is flexibly connected to the front body portion 52. The rear body portion 54 is substantially the same as the shield machine 4 described above.

  The front body portion 52 includes a front body portion 55 that forms an outer shell and supports the inner periphery shield 53 so as to be movable forward and backward, and an outer peripheral cutter 56 that is rotatably supported by the front body portion 55.

  As shown in FIGS. 5 and 6, the outer cutter 56 includes a ring-shaped outer cutter face plate 57 and a cylindrical outer shaft portion 58 extending rearward from the vicinity of the inner peripheral end of the outer cutter face plate 57.

  The diameter of the outer cutter face plate 57 is preferably the same as the amount of earth and sand excavated per unit time between the outer shield 51 and the inner shield 53.

  In particular, since the assembly of the segment 20 is not performed while the outer peripheral shield 51 is being excavated, it is desirable to excavate the outer peripheral shield 51 as fast as possible, but it is biased toward either the outer peripheral shield 51 or the inner peripheral shield 53. When excavating the earth and sand, the processing capacity of the following earth and sand treatment facility (not shown) must be determined according to the side where the excavation is large, and the earth and sand treatment facility is used for a normal shield machine. This is because the advantage of the shield machine 50 that the earth and sand processing facility can be reduced is lost.

  The outer peripheral shaft portion 58 is configured to accommodate an inner peripheral shield 53 (described later) so as to be movable back and forth, and is supported by being sandwiched by the front trunk body portion 55 from the inner peripheral side and the outer peripheral side. . Further, an internal gear 59 is formed at the rear end of the outer peripheral shaft portion 58 to be connected to an outer peripheral drive motor 71 described later.

  On the back side (rear side) of the outer cutter face plate 57, an outer cutter chamber 60 for temporarily storing the excavated earth and sand is formed. The outer cutter chamber 60 is divided into an outer peripheral shaft portion 58 on the inner peripheral side and a skin plate 63 described later on the outer peripheral side, and the first mud pipe 61 and the first mud pipe 61 are provided in the outer cutter chamber 60. A mud pipe 62 is connected to each other.

  The front body 55 is formed in a cylindrical shape and forms an outer shell, a first bearing 64 provided on the radially inner side of the skin plate 63, and the skin plate 63 via a second frame 49. A cylindrical inner peripheral wall 65 that is provided concentrically and supports the outer periphery of an inner body portion (body portion) 76 of an inner periphery shield 53, which will be described later, so as to be able to move back and forth while being liquid-tightly covered.

  The first bearing 64 is concentrically provided on the skin plate 63 via the first frame 66 and covers the outer peripheral side of the outer peripheral shaft part 58 over the entire circumference and supports it while sealing it, It comprises an inner peripheral side shaft support portion 68 provided concentrically on the inner peripheral wall 65 and supporting the inner peripheral side of the outer peripheral shaft portion 58 while sealing the entire periphery.

  The inner peripheral wall 65 is formed to be sufficiently long by extending from a substantially central position in the front-rear direction of the front body portion 52 to a substantially bent position, and even if a biased load is applied to the inner peripheral shield 53, the inner peripheral shield 53. The sliding resistance is not increased.

  As shown in FIGS. 5 and 7, the inner peripheral wall 65 is formed with a sufficiently small diameter so that a sufficient space 69 is formed between the inner peripheral wall 65 and the skin plate 63.

  In a space 69 between the inner peripheral wall 65 and the skin plate 63, a middle-folded jack 70 for bending the front barrel portion 52 and the rear barrel portion 54, and an outer peripheral drive motor (drive motor) for rotationally driving the outer cutter 56 are provided. ) 71, an outer peripheral propulsion jack 72 for receiving the reaction force from the existing segment 19 to dig up the outer peripheral shield 51, a first mud feed pipe 61, a first mud discharge pipe 62, and an inner peripheral cutter chamber 83 to be described later A second mud feed pipe 73 and a second mud discharge pipe 74 connected to the inner wall 65 are accommodated, and the middle jack 70 is disposed in a wrapping manner at a radially outer position of the inner peripheral wall 65.

  The outer peripheral drive motor 71 has a coaxial drive gear 75 on a drive shaft (not shown), and is disposed so as to mesh the drive gear 75 with the internal gear 59 of the outer peripheral shaft portion 58.

  The inner peripheral shield 53 includes an inner body 76 that is liquid-tightly accommodated in the inner peripheral wall 65, an inner peripheral cutter 77 that is pivotally supported by the inner body 76 via a second bearing 85 described later, One end is provided on the inner body portion 76 and the other end is provided on the inner peripheral wall 65, and includes an inner peripheral propulsion jack 78 that moves the inner peripheral shield 53 forward and backward.

  The inner trunk portion 76 is formed in a cylindrical shape having a front end face 79, is formed as small as possible, and has a smaller diameter than the inner peripheral cutter 77.

  The inner cutter 77 includes an inner cutter face plate 80 that is spaced apart from the front of the inner trunk portion 76 and a rod-like inner peripheral shaft portion 81 that extends rearward from the center of the inner cutter face plate 80.

  The inner cutter face plate 80 has a slit opening / closing device 82 for passing the excavated earth and sand to the back side so that the flow rate can be adjusted, and excavated in an inner cutter room 83 formed on the back side of the inner cutter face plate 80. It can be taken in while adjusting the flow rate. On the back side of the inner peripheral cutter face plate 80, a stirring plate 84 for stirring the earth and sand in the inner peripheral cutter chamber 83 is provided so as to protrude rearward.

  The inner peripheral cutter chamber 83 is a space formed between the outer peripheral shaft portion 58 and the inner peripheral shield 53, and is deformed when the inner peripheral shield 53 advances and retreats.

  A second mud pipe 73 and a second mud pipe 74 are connected to the inner cutter chamber 83, respectively. The second mud feed pipe 73 and the second mud discharge pipe 74 are respectively connected between the inner peripheral wall 65 and the inner peripheral shaft support portion 68 and connected to the inner peripheral cutter chamber 83.

  The inner peripheral shaft portion 81 extends through the front end surface 79 of the inner barrel portion 76 to the rear barrel portion 54 and is rotatably supported by a second bearing 85 provided in the inner barrel portion 76. .

  The inner peripheral shaft portion 81 is integrally provided with a passive gear 86 located in the inner trunk portion 76. The passive gear 86 is rotationally driven by an inner peripheral drive motor 87 provided in the inner trunk portion 76, and rotates the inner peripheral cutter face plate 80 by receiving the driving force of the inner peripheral drive motor 87. It is like that.

  A plurality of inner peripheral propulsion jacks 78 are provided at substantially equal intervals along the inner periphery of the inner trunk portion 76.

  Next, the operation will be described.

  As shown in FIG. 5, the outer shield 51 is advanced from a state in which the excavation surfaces of the inner cutter 77 and the outer cutter 56 are matched. At this time, the outer peripheral propulsion jack 72 is extended, and the outer peripheral cutter 56 is rotationally driven by the outer peripheral drive motor 71 while taking a reaction force from the existing segment 19. The rotational driving force of the outer peripheral drive motor 71 is transmitted to the outer peripheral shaft portion 58 via the internal gear 59.

  The outer peripheral shaft portion 58 rotates while the outer peripheral side is in liquid-tight contact with the outer peripheral side shaft support portion 67 and the inner peripheral side is in liquid-tight contact with the inner peripheral side shaft support portion 68.

  Since the outer cutter face plate 57 excavates the earth and sand while rotating only in one direction, the cutter bit 88 does not instantaneously bite into the earth and sand at the reciprocating operation switching point (cutter stop point) like a swing type cutter. The outer peripheral shield 51 can be smoothly and efficiently dug without being forced.

  Further, since the inner peripheral cutter 77 is formed to have a larger diameter than the inner trunk portion 76 and the excavation area of the outer peripheral cutter 56 is optimized, it is possible to dig up quickly.

  The earth and sand excavated by the outer cutter face plate 57 is sent into the outer cutter room 60. Mud is continuously fed from the first mud pipe 61 into the outer cutter chamber 60 and continuously drained from the first mud pipe 62. Also, the earth and sand in the outer cutter chamber 60 flows in the outer cutter chamber 60 due to the rotation of the outer cutter 56, and is quickly taken into the first mud discharge pipe 62 while being stirred.

  At this time, since the outer peripheral shaft portion 58 rotates between the outer peripheral cutter chamber 60 and the inner peripheral cutter chamber 83, the first mud feed pipe 61 and the first mud discharge pipe 62 do not directly contact the outer peripheral cutter 56, There is no concern that the rotation of the outer cutter 56 may be hindered or earth and sand leakage may occur between the outer cutter 56 and the like.

  As shown in FIG. 8, when the outer shield 51 is dug for a predetermined distance, the outer shield 51 is stopped and the inner shield 53 is dug. In the meantime, the segment 20 is assembled in the rear trunk portion 54 as in the above-described reference embodiment.

  After the outer shield 51 is dug at a high speed to form a segment assembling space, the inner shield 53, which is difficult to drill at a high speed, is dug during the segment assembling time while the segment 20 is being assembled. The excavation work of the circumferential shield 53 can be performed in parallel, and high-speed excavation can be performed.

  The earth and sand excavated by the inner cutter 77 flows into the inner cutter chamber 83 through the slit opening / closing device 82.

  The inner peripheral cutter chamber 83 is continuously supplied with mud from the second mud supply pipe 73, and the earth and sand in the inner peripheral cutter chamber 83 is continuously discharged from the second mud discharge pipe 74.

  When the inner peripheral shield 53 is dug to a predetermined front end position, the inner circumference shield 53 is stopped, and a tunnel is constructed while the outer circumference shield 51 and the inner circumference shield 53 are successively dug.

  When the tunnel is bent, the bent jack 70 is extended or retracted, the copy cutter 89 provided on the outer cutter 56 is overhanged while changing the direction of the front barrel 52, and is dug to a segment for curve construction. (Not shown) are assembled sequentially.

  At this time, the folded jack 70 is disposed so as to wrap radially outward of the inner peripheral wall 65, and the front body portion 52 is formed short, so that it can easily cope with sharp curve construction and has a good posture. Can be controlled.

  As described above, since the outer peripheral shield 51 includes the outer peripheral cutter 56 that is rotatable on the front surface, the excavation efficiency can be improved as compared with the swinging outer peripheral cutter.

  In addition, since the folded jack 70 is disposed so as to wrap radially outward of the inner peripheral wall 65, the length of the shield machine 50 can be shortened, and the attitude controllability can be improved.

  Since the inner body portion 76 of the inner peripheral shield 53 is formed with a smaller diameter than the inner peripheral cutter 77, a space 69 between the inner peripheral wall 65 and the skin plate 63 can be formed wider, and a relatively small diameter shield machine. Even if it is 50, it is possible to wrap the jack 70 and wrap it outside the inner peripheral wall 65.

  Further, since the outer peripheral drive motor 71 and the first bearing 64 are disposed on the outer peripheral side of the inner peripheral wall 65, the outer peripheral drive motor 71 and the first bearing 64 are disposed so as to be wrapped around the inner peripheral wall 65, or the inner peripheral wall 65 The outer peripheral shield 51 can be bent at the position of the inner peripheral wall 65.

  Since the first mud pipe 61 and the first mud pipe 62 are connected to the outer cutter chamber 60, the earth and sand excavated by the outer cutter 56 can be satisfactorily taken out and discharged.

  In the above-described reference embodiment, the second mud pipe 73 and the second mud pipe 74 are passed through the space 69 between the inner peripheral wall 65 and the skin plate 63, but the present invention is not limited to this.

  For example, as shown in FIGS. 9 and 10, the second mud feeding pipe 90 and the second mud discharge pipe 91 are passed through the inner body 92, and the front end surface 93 of the inner body 92 is penetrated to the inner peripheral cutter chamber. It is good also as what connects in 94.

  The mud can be sent and distributed immediately behind the stirring plate 95, and the earth and sand in the inner cutter chamber 94 can be treated efficiently.

  In the above-described reference embodiment, the internal gear 59 is formed on the outer peripheral shaft portion 58, and the drive gear 75 of the outer peripheral drive motor 71 is meshed with the internal gear 59. However, the present invention is not limited to this. 12, an external gear 101 may be formed in the vicinity of the rear end of the outer peripheral shaft portion 100, and the drive gear 75 of the outer peripheral drive motor 71 may be meshed with the external gear 101.

  In this case, the outer diameters of the inner peripheral cutter 102 and the inner trunk portion 103 can be made uniform, but it is difficult to secure a space for arranging the folding shield 106 between the inner peripheral wall 104 and the skin plate 105, and the length of the machine becomes longer. Because it is easy, it should be used for construction that does not perform sharp curve construction.

  Further, the first mud pipe 61 and the first mud pipe 62 are connected to the outer cutter chamber 60, respectively, and the second mud pipe 73 and the second mud pipe 74 are connected to the inner cutter chamber 83, respectively. Although the muddy water shield machine to be connected has been described, the present invention is not limited to this, and an earth pressure shield machine having a screw conveyor in the outer cutter chamber 60 and a screw conveyor in the inner cutter chamber 83 may be used.

  Embodiments of the present invention will be described. In addition, description is abbreviate | omitted about the structure similar to the above-mentioned reference form, and the same code | symbol is attached | subjected.

  As shown in FIG. 13, the shield machine 112 is provided in the ring-shaped penetration hood 111 and the penetration hood 111, and takes the reaction force from the existing segment 19 to dig the penetration hood 111 into at least one ring of the segment 20. A hood propulsion jack 113 to be moved, an inner peripheral shield 116 provided on the inner periphery of the penetrating hood 111 so as to be freely advanced and retracted, and an erector 22 provided on the penetrating hood 111 and assembling the segment 20 while the inner peripheral shield 116 is being excavated. .

  The penetration hood 111 is formed by forming a steel material into a cylindrical shape, and is penetrated into the natural ground by extending the hood propulsion jack 113.

  The inner peripheral shield 116 has an inner peripheral cutter 115 that is rotationally driven, and is connected to the penetrating hood 111 via an inner peripheral propulsion jack 114 described later.

  The inner circumferential propulsion jack 114 is for digging the inner circumferential shield 116 in the penetrating hood 111. When the hood propelling jack 113 is expanded, the inner circumferential propulsion jack 114 is retracted from the expanded state, and when the penetrating hood 111 is stopped, The inner shield 116 is dug up to the position of the penetration hood 111.

  When the shield machine 112 is excavated, first, the inner circumferential propulsion jack 114 is retracted while the hood propulsion jack 113 is expanded. As shown in FIG. 14, the penetration hood 111 is pushed forward and advanced while being inserted into a natural ground.

  Next, as shown in FIG. 15, the advancement of the penetration hood 111 is stopped, and the inner peripheral propulsion jack 114 is extended while the inner peripheral cutter 115 is rotated, so that the inner peripheral shield 116 is dug. During this time, the segment 20 is assembled in the same manner as in the reference embodiment described above.

  In this way, when the penetration hood 111 is pushed forward into the ground and advanced, high-speed excavation can be performed in the same manner as in the above-described reference embodiment, and the outer cutter, the bearing of the outer cutter, the drive motor, and other devices can be installed. The cost can be greatly reduced and the cost can be reduced.

2 Outer shield 3 Inner shield 4 Shield machine 5 Outer cutter 6 Front trunk portion 7 Rear trunk portion 18 Folding jack 19 Existing segment 20 Segment 21 Outer peripheral propulsion jack 22 Elector 28 Inner peripheral propulsion jack 50 Shield engraving machine 51 Outer shield 53 Inner shield 56 Outer cutter 60 Outer cutter chamber 61 First mud pipe (mud pipe)
62 1st mud pipe (mud pipe)
64 1st bearing (bearing)
65 Inner peripheral wall 70 Folding jack 71 Outer peripheral drive motor (drive motor)
76 Inner trunk (torso)
77 Inner peripheral cutter 78 Inner peripheral propulsion jack 111 Intrusion hood 112 Shield engraving machine 113 Hood propulsion jack 116 Inner peripheral shield

Claims (1)

  A ring-shaped penetrating hood, a hood propulsion jack that is provided on the penetrating hood and takes a reaction force from an existing segment to advance at least one segment of the penetrating hood, and can be moved forward and backward on the inner periphery of the penetrating hood. A shield machine provided with an inner peripheral shield and an erector provided on the penetrating hood and for assembling a segment while the inner peripheral shield is being excavated.

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