JP2006037430A - High-speed construction shield method and shield tunneling machine used for the method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a high-speed construction shield method excellent in economical efficiency, work execution property and stability, and a shield tunneling machine used for the method. <P>SOLUTION: A lock mechanism 8 which follows the progress of the rear drum of the shield tunneling machine, and is hooked on a recessed groove part 15 provided in the circumferential direction of the outer circumferential surface of an existing segment 5, thereby taking a reaction force to extend and contract an excavation jack 3 is provided on a rear part inside surface 11b of the rear drum. Excavation work and the assembling work of the segment 5 are performed in the same period by successively repeating a first process for hooking the lock mechanism 8 on the recessed groove part of an existing segment 5 to take the reaction force, a second process for extending the excavation jack 3 to the existing segment 5 by the reaction force to propel a front drum 10 by the portion of one ring width of the segment 5, during which a new segment 5' is assembled by an elector device 2 contained in the rear drum; and a third process for contracting the excavation jack 3 to propel the rear drum by the portion of one ring width of the segment 5, and hooking the lock mechanism 8 to the recessed groove part 15 of the new segment 5'. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention belongs to the technical field of a high-speed shield method for excavating a tunnel and a shield machine used for the tunnel method. More specifically, the excavation work by a shield excavator and the assembly work of a segment by an elector apparatus are performed at the same time. The present invention relates to a high-speed construction shield method and a shield machine used for the method.

  The shield construction method is to construct a tunnel by assembling segments on the trace of excavating natural ground with a shield machine. In recent years, it has been difficult to secure a site for shield construction, especially in crowded urban areas, and even if the site can be secured, long-term use is difficult, and the increase in the distance of tunnels has become prominent. Furthermore, due to problems such as the need to meet the social needs for cost reduction in construction work, it is desired to increase the speed of the shield method.

  However, in the conventional shield method, the excavation work is temporarily stopped when one ring of the segment has been excavated with the shield excavator, the segment is assembled for one ring, and the excavation work with the shield excavator is completed again after the assembly of the segment is completed. Had started. In short, the conventional shield method has been carried out by alternately repeating the excavation work by the excavator and the segment assembling work by the erector device, and therefore requires a relatively long work time, and there is room for speeding up the shield method. A great deal was left behind.

  Conventionally, various high-speed construction shield construction methods have been disclosed that can speed up the shield construction method by performing excavation work and segment assembly work at the same time, and can greatly reduce the work time ( For example, see Patent Documents 1 to 3).

  The high-speed construction shield method described in Patent Document 1 starts from the initial state in which the excavating jack is contracted and all the propulsion jacks are extended (see FIG. 3 of Patent Document 1), and the reaction force is applied to the front end surface of the segment. While extending the digging jack and digging up the front trunk, at the same time, shrinking some of the propulsion jacks and incorporating the segment piece between the existing segments and reacting to the new segment piece The process is repeated on other propulsion jacks in order to assemble the segments into a ring shape, and after assembling the segments, apply pressure to the push-side pressure chambers of the excavation jack and the propulsion jack to return these jacks to the initial state. It is carried out by the operation method (see the claims and the 14th page, lower left column, line 14 to page 4, upper left column, line 10).

  The high-speed construction shield construction method described in Patent Document 2 is more compact than the Patent Document 1 in that the shield tunneling machine can be made compact by devising it so that the strokes of the excavation jack and the propulsion jack can be shortened. However, the technical idea of the operation method is almost the same as that of Patent Document 1. In other words, while extending the front trunk by extending the digging jack while applying a reaction force to the front end surface of the segment, at the same time, a part of the plurality of propulsion jacks is shrunk to incorporate the segment piece between the existing segment and newly installed By repeating the process of taking a reaction force on the segment piece that has just been repeated on other propulsion jacks, the segments are assembled into a ring shape, and after the segments are assembled, the excavation jack and the propulsion jack are returned to the initial state. (See claim 3 and paragraph numbers [0026] to [0035]).

  As shown in FIGS. 1 and 2 of the same document 3, the high-speed construction shield method described in Patent Document 3 starts from the initial state in which the excavating jack 11 and the rear reaction force jack 7 are contracted. The excavating jack 11 is extended while taking the reaction force on the surface, and the front barrel 1 is excavated. Then, the reaction force is transferred to the rear reaction force support drum 2, and the excavating jack 11 is all contracted, so that the existing segment 4 The segment piece 4 ′ is assembled between the two. During this time, a part of the digging amount is dug by the rear reaction force jack 7 and the center shaft 10. At this time, the digging reaction force is supported via the rear reaction force support drum 2. Thus, after the assembly of the front new segment 4 'is completed, the reaction force is again supported on the end face of the new segment by the excavation jack 11, and the remaining excavation is performed (see paragraph [0011]).

  In short, the high-speed construction shield method described in the above-mentioned patent documents 1 to 3 realizes the high-speed shield method by performing the excavation work by the excavator and the assembly work of the segment by the elector device at the same time. Therefore, the above-mentioned problems are solved.

Japanese Examined Patent Publication No. 3-23720 Japanese Patent No. 3447116 JP-A-6-58080

  The technologies according to Patent Document 1 and Patent Document 2 have a common requirement that the reaction force for digging up the front trunk is obtained by extending the propulsion jack on the front end face of the existing segment or the new segment.

  Therefore, it is necessary to repeatedly perform the process of incorporating a segment piece between existing segments by retracting a part of a plurality of propulsion jacks and taking a reaction force on the segment piece to other propulsion jacks. There is a problem in that the control is complicated and the cost is increased. Along with this, there is a possibility that the control mechanism of the propulsion jack may break down, and there is a problem that it is difficult to repair in the event of a failure.

  In addition, regarding the construction of the segments, the work of assembling the segment pieces must be sequentially performed after the replacement of some propulsion jacks, and there is a problem that the smooth assembling work cannot be performed. Furthermore, since it is necessary to apply a large reaction force to a segment (piece) that is not newly established, there is a doubt about the stability of the excavation work performed by using the reaction force on the segment (piece).

  Therefore, it can be said that the techniques according to Patent Document 1 and Patent Document 2 still have room for improvement in terms of economy, workability, and stability.

  It is noted that the technique according to Patent Document 3 can incorporate the segment piece 4 ′ between the existing segment 4 by contracting all the excavating jacks 11.

  However, this technology is also forced to give a large reaction force to a newly established segment (piece), so there is doubt about the stability of excavation work that takes the reaction force on the segment (piece). Remains. In addition, since the huge center shaft 10 is mounted in the axial direction inside the shield machine 1, there is a problem in that the work of assembling the segments by the erector device is hindered and workability is poor.

  The object of the present invention is to realize the reaction force for digging the front barrel on the stable outer peripheral surface of the existing segment, so that the excavation work and the segment assembly work are performed at the same time, and the high speed of the shield method Of course, the control of the propulsion jack can be performed simply, and the assembly work of the segments can be performed in a sufficient space without being restricted by the replacement of the propulsion jack. The object is to provide an excellent high-speed shield construction method and a shield machine used for the construction method.

As means for solving the above-described problems of the prior art, the high-speed construction shield method according to the invention described in claim 1 is:
A shield machine in which a front cylinder 10 provided with a shield excavator 1 on the front and a rear cylinder 11 containing an erector apparatus 2 for assembling segments 5 and 5 'are slidably connected in an axial direction by an excavator jack 3. In digging shield method,
A reaction force is applied to the inner surface 11b of the rear part of the rear body 11 of the shield machine following the progress of the rear body 11 and hung on the groove 15 or the ridge 16 provided in the circumferential direction of the outer peripheral surface of the existing segment 5. A locking mechanism 8 is provided that allows the digging jack 3 to extend,
A first step in which the digging jack 3 is contracted to an initial state, and the locking mechanism 8 is hooked on the concave groove portion 15 or the convex strip portion 16 of the existing segment 5 to take a reaction force;
The digging jack 3 which takes the reaction force on the existing segment 5 by the locking mechanism 8 is extended to dig the front cylinder 10 by one ring width of the segments 5, 5 ′. A second step of assembling one ring of the newly established segment 5 ′ having the groove portion 15 or the ridge portion 16 in the circumferential direction of the outer peripheral surface by 2;
The digging jack 3 is contracted to propel the rear barrel 11 by one ring width of the segments 5 and 5 ′, and the locking mechanism 8 is latched on the concave groove portion 15 or the convex strip portion 16 of the new segment 5 ′. And the process of
Hereinafter, the excavation work and the assembly work of the segments 5 and 5 ′ are performed at the same time by sequentially repeating the first process to the third process.

As shown in FIGS. 1 to 4, the high-speed construction shield method according to the invention described in claim 2 is as follows.
A shield machine in which a front cylinder 10 provided with a shield excavator 1 on the front and a rear cylinder 11 containing an erector apparatus 2 for assembling segments 5 and 5 'are slidably connected in an axial direction by an excavator jack 3. In digging shield method,
A propulsion jack 3 is provided on the front inner surface 11a of the rear barrel 11 of the shield machine, which takes a reaction force on the front end surface of the new segment 5 ', and the rear barrel 11 is advanced on the rear inner surface 11b of the rear barrel 11. A locking mechanism 8 is provided that can follow and extend the digging jack 3 by taking a reaction force by hooking on the concave groove 15 or the ridge 16 provided in the circumferential direction of the outer peripheral surface of the existing segment 5;
A first step in which the excavation jack 3 and the propulsion jack 4 are contracted to be in an initial state, and the locking mechanism 8 is hooked on the concave groove portion 15 or the convex strip portion 16 of the existing segment 5 to take a reaction force;
The locking mechanism 8 extends the digging jack 3 which takes a reaction force on the existing segment 5 to dig the front barrel 10 by one ring width of the segments 5 and 5 ′. A second step of assembling one ring of a new segment 5 ′ having a groove or ridge in the circumferential direction of the outer peripheral surface;
One end of the propulsion jack 4 is brought into contact with the front end surface of the new segment 5 ′, and the propulsion jack 4 is stretched by applying a reaction force to the front end surface of the new segment 5 ′. 3, the rear cylinder 11 is propelled by one ring width of the segments 5, 5 ′, and the locking mechanism 8 is hooked on the groove 15 or the ridge 16 of the new segment 5 ′. When,
A fourth step of contracting the propulsion jack 4 to return it to the initial state;
Hereinafter, the first step to the fourth step are sequentially repeated, and the excavation work and the assembly work of the segments 5 and 5 ′ are performed at the same time.

The shield machine according to the invention described in claim 3 is:
A front barrel 10 having a shield excavator 1 on the front surface and a rear barrel 11 incorporating an erector device 2 for assembling the segments 5 and 5 'are slidably connected in an axial direction by an excavating jack 3.
The inner surface 11b of the rear part of the rear body 11 of the shield machine is followed by the progress of the rear body 11 and is hung on the concave groove 15 or the ridge 16 provided in the circumferential direction of the outer peripheral surface of the existing segment 5. A locking mechanism 8 is provided to take force and extend the digging jack 3;
A control device for extending and retracting the digging jack 3 is provided.

As shown in FIG. 1, the shield machine according to the invention described in claim 4
A front barrel 10 having a shield excavator 1 on the front surface and a rear barrel 11 incorporating an erector device 2 for assembling the segments 5 and 5 'are slidably connected in an axial direction by an excavating jack 3.
On the front inner surface 11a of the rear barrel 11 of the shield machine 3 is provided a propulsion jack 4 that takes a reaction force on the front end face of the newly provided segment 5 ′ provided with the concave groove 15 or the ridge 16 in the circumferential direction of the outer peripheral surface. The rear inner surface 11b of the rear cylinder 11 follows the progress of the rear cylinder 11 and is hung on the groove 15 or the ridge 16 provided in the circumferential direction of the outer peripheral surface of the existing segment 5 to react with the reaction force. And a locking mechanism 8 is provided that can extend the digging jack 3;
A control device for extending and retracting the excavation jack 3 and the propulsion jack 4 is provided.

The invention described in claim 5 is the shield machine according to claim 3 or 4,
The excavation jack 3 is characterized by having a stroke corresponding to one ring width of the segments 5 and 5 ′.

The invention described in claim 6 is the shield machine according to claim 4,
The propulsion jack 4 is characterized by having a stroke corresponding to one ring width of the segments 5 and 5 '.

The invention described in claim 7 is the shield machine according to any one of claims 3 to 6,
The lock mechanism 8 includes a plurality of plate springs 7 arranged in the axial direction in the circumferential direction of the rear cylinder 11. Each of the plate springs 7 is fixed at the front end 7 a to the rear inner surface 11 b of the rear cylinder 11. The rear end 7b is opened, and the rear end 7b of the opened leaf spring 7 is configured to follow the progress of the rear barrel 11 while elastically contacting the outer peripheral surface of the existing segment 5. It is characterized by.

The invention described in claim 8 is the shield machine according to any one of claims 3 to 7,
Between the lock mechanism 8 and the rear inner surface 11b of the rear barrel 11, there is provided a bag body 17 that can be inflated and contracted to press and fix the lock mechanism 8 against the existing segment 5 side. .

According to the shield construction machine used for the high-speed construction shield method and the construction method according to the present invention, the reaction force for digging the front barrel 10 is already provided by the lock mechanism 8 provided on the rear inner surface 11b of the rear barrel 11. Since it is the structure taken in the outer side (outer peripheral surface) of the existing segment 5 excellent in the stability after construction, there exist the following effects.
I) By performing the excavation work and the assembly work of the segments 5 and 5 ′ at the same time, the shield method can be speeded up, and the front trunk 10 can be excavated in a stable state.
II) Unlike the prior art, there is no need to individually control the expansion and contraction of some of the propulsion jacks and the remaining propulsion jacks, so that the control mechanism of the propulsion jacks can be simplified and the economy is excellent.
III) Since the assembly work of the segments 5 and 5 'can be smoothly performed in a sufficient work space without being restricted by the replacement of jacks, the workability is excellent.
IV) As described above, a high-speed shield method with excellent economic efficiency, workability, and stability can be realized, so it is difficult to secure a site for shield work, which has been a problem in the past, especially in urban areas where congestion is high. Even if the land can be secured, it is difficult to use for a long time, and the long distance of the tunnel is becoming more prominent, and further, it is necessary to satisfy the social needs of cost reduction of construction work, Etc. can be solved reliably at once.

  The shield construction machine used in the high-speed construction shield method and the construction method according to the present invention is carried out as follows in order to realize high speed with excellent workability, economy, and stability.

  1 and FIG. 5 show the shield machine according to claim 4, and FIGS. 1 to 4 show the high-speed construction shield method using the shield machine according to claim 2 step by step. ing.

In this shield machine, a front barrel 10 provided with a shield drilling device 1 on the front side and a rear barrel 11 incorporating an erector device 2 for assembling segments 5 and 5 'are slidably connected in an axial direction by a drilling jack 3. Is a so-called compound barrel shield machine,
On the inner side surface 11a of the front part of the rear body 11 of the shield machine, a propulsion jack 4 that takes a reaction force on the front end face of the new segment 5 ′ provided with the groove 15 or the ridge 16 in the circumferential direction of the outer peripheral surface is substantially horizontal. The rear inner surface 11b of the rear cylinder 11 follows the progress of the rear cylinder 11, and is provided with a groove 15 or a ridge 16 provided in the circumferential direction of the outer peripheral surface of the existing segment 5 (see FIG. 8). A locking mechanism 8 is provided that is capable of extending the digging jack 3 by using a reaction force that is latched on
A control device (not shown) for extending and retracting the excavation jack 3 and the propulsion jack 4 is provided (the invention according to claim 4).

  The segment 5 (5 ') according to FIGS. 1 to 4 is implemented by forming a concave groove 15 along the circumferential direction of the outer peripheral surface thereof. The segment 5 applicable to the present invention is not limited to this shape, and as shown in FIG. 8, it can also be implemented by forming the ridge 16 along the circumferential direction of the outer peripheral surface thereof. As shown in FIG. 7 and FIG. 8, it is possible to carry out by providing the concave groove portions 15 and 15 or the ridge portions 16 and 16 in a double ring shape with respect to one segment 5, or three or more layers. It is also possible to carry out by providing the concave groove portions 15... Or the convex strip portions 16. Moreover, although the said recessed groove part 15 or the protruding item | line part 16 is provided and implemented continuously along the circumferential direction of the outer peripheral surface of the said segment 5, it can also provide and implement intermittently. By the way, the ridge portion 16 is a sheet steel material along the outer peripheral surface of the segment 5 after assembling the general-purpose segment 5 into a ring shape in addition to applying the segment 5 having the ridge portion 16 on the outer peripheral surface in advance. It can also be carried out by forming the ridges 16 by winding them in a ring shape.

  As shown in FIG. 5, the lock mechanism 8 according to the present embodiment is provided with a plurality of leaf springs 7 arranged in the axial direction at substantially equal intervals in the circumferential direction of the rear barrel 11 as shown in FIG. Each leaf spring 7 has its front end 7a fixed to the rear inner surface 11b of the rear barrel 11, the rear end 7b is opened, and the rear end 7b of the opened leaf spring 7 is The invention is implemented in a configuration that follows the progress of the rear barrel 11 while elastically contacting the outer peripheral surface of the existing segment 5 (invention of claim 7). Therefore, as shown in FIGS. 7 and 8, the leaf spring 7 of the lock mechanism 8 has the groove portions 15 and 15 or the ridge portions 16 and 16 in a double ring shape with respect to one segment 5. When it is provided and implemented, the leaf springs 7 are configured in two rows in the front-rear direction.

  That is, the lock mechanism 8 is configured to follow the progress of the rear cylinder 11 while elastically contacting the rear end portion of the leaf spring 7 with the outer peripheral surface of the existing segment 5. However, when it reaches a position where it can be latched on the concave groove portion 15 or the convex strip portion 16 of the segments 5, 5 ′, it can be moved forward smoothly but cannot be moved backward at all. It is.

  By the way, the leaf spring 7 applied as the lock mechanism 8 can push the digging jack 3 by using the reaction force on the concave groove portion 15 (or the ridge portion 16) of the segment 5 and can dig the front barrel 10. Note that the design is rigid. Of course, it should be noted that the structure of the concave groove portion 15 (or the ridge portion 16) itself is designed in consideration of the same purpose.

  The shield excavator 1 according to the present embodiment uses a cutter head and is rotatably mounted on the front surface of a cylindrical front trunk 10. A cylindrical rear cylinder 11 is inserted into the rear part of the front cylinder 10 so that the front part 11a is slidable in the axial direction, and the front part (insertion part) 11a is located at the rear end of the front cylinder 10. The rear portion (non-insertion portion) 11b is polymerized through the provided seam seal 6 and has the same diameter as the front barrel so as to maintain the tunnel diameter excavated in the size of the diameter of the front barrel 10 also in the rear. It has been expanded to become.

  A tail seal 9 is provided at the rear end of the rear cylinder 11 to prevent water and the like from entering through a gap with the segment 5 assembled in a ring shape along the circumferential direction of the inner surface of the rear cylinder 11. The tenth seam seal 6 and the front cylinder 10 and the rear cylinder 11 are ensured to be sealed.

  A plurality of excavation jacks 3 and propulsion jacks 4 are disposed along the circumferential direction of the inner peripheral surface of the front cylinder 10 and the rear cylinder 11 with their operating directions directed in the frame axis direction. Specifically, this arrangement is provided in a ring shape in a balanced manner along the circumferential direction of the inner peripheral surface of the rear barrel 11 (in this embodiment, eight at equal angles), and the space in the center portion is provided. It is implemented so that it can be used effectively.

  The excavation jack 3 is fixed at its base end side to a mounting plate 12 projecting in a ring shape along the circumferential direction of the front end portion inner surface of the front portion 11 a of the rear barrel 11, and the rod distal end side of the front barrel 10. It is connected to an abutment plate 13 provided on the inner periphery, and is configured to be slidable in the axial direction at the overlapping portion by expanding and contracting the digging jack 3, specifically, against the mounting plate 12 (rear barrel 11). It is carried out in such a configuration that the front barrel 10 is pushed out by force and is excavated by the excavator 1 on the front side. In addition, the fixing means of the said digging jack 3 with respect to the back trunk | drum 11 is not limited to this. Moreover, even if it arrange | positions the direction of the base end side and the rod front end side in the said digging jack 3 reversely right and left, it can implement substantially similarly.

  The propulsion jack 4 is fixed at its proximal end to a mounting plate 14 projecting in a ring shape along the circumferential direction on the inner surface of the central portion of the front portion 11 a of the rear barrel 11, and at the rod distal end side to the rear barrel 11. It is provided in an arrangement that abuts on a ring-shaped new segment 5 ′ assembled by the built-in erector device 2, and a reaction force is applied to the new segment 5 ′ so that the rear cylinder 11 can be drawn toward the front cylinder 10 to be polymerized deeply. It has been implemented. Note that the means for fixing the propulsion jack 4 to the rear cylinder 11 is not limited to this. Moreover, even if it arrange | positions the direction of the base end side and rod front end side in the said propulsion jack 4 upside down, it can implement substantially the same.

  The excavation jack 3 and the propulsion jack 4 are controlled by a control device (not shown) so that they can be individually expanded and contracted, and can be operated in various ways according to their intended use. Further, it is preferable that the strokes of the excavation jack 3 and the propulsion jack 4 are both about 1000 mm, which is substantially equal to the width of one ring of the segments 5, 5 ′ (the inventions according to claims 5 and 6). Further, the number of used excavation jacks 3 and propulsion jacks 4 is not limited to eight, and can be implemented with a suitable number according to the shield diameter. In particular, the propulsion jack 4 is not used for digging the front barrel 10 but may be used for propelling the rear barrel 11, so that the number of used jacks is at least as compared with the prior art. It can be sufficiently implemented (for example, about three). Incidentally, as will be described later, in order to propel the rear cylinder 11, it is also possible to carry out by merely contracting the digging jack using the circumferential frictional force of the front cylinder 10 or the like. 1 and claim 3).

  A high-speed construction shield method using the shield machine having the above-described configuration will be described with reference to FIGS.

  FIG. 1 shows an initial state in which all excavation jacks 3 and propulsion jacks 4 of the shield machine are contracted. Incidentally, it should be noted that a gap (about 1200 mm) capable of sufficiently incorporating the new segment 5 'is secured in advance between the contracted propulsion jack 4 and the front end surface of the existing segment 5.

  From this state, the rear end portion 7b of the leaf spring 7 of the locking mechanism 8 is set in the concave groove portion 15 of the leading segment 5 of the existing segments 5, and is hooked on the concave groove portion 15 of the segment 5 to be bent. Take force (first step).

  Since the leaf spring 7 of the locking mechanism 8 is configured to follow the progress of the rear cylinder while elastically contacting the outer peripheral surface of the existing segment 5, the rear cylinder 11 is advanced to position the leaf spring 7 in the concave groove portion 15. Then, the rear end portion 7 b of the leaf spring 7 automatically comes into contact with the bottom portion and the rear wall of the concave groove portion 15.

  The state shown in FIG. 1 is shifted to the state shown in FIG. 2 and the simultaneous construction of the excavation work and the segment assembling work is started. That is, the locking mechanism 8 extends the digging jack 3 which takes a reaction force on the existing segment 5 to dig the front barrel 10 by one ring width (about 1000 mm) of the segment 5 (5 ′). One ring of the newly installed segment 5 ′ is assembled by the erector device 2 built in the body 11 (second step).

  Since the rear end portion 7b of the leaf spring 7 of the lock mechanism 8 is firmly in contact with the rear wall in the concave groove portion 15 of the existing segment 5, the excavation jack 3 takes a sufficient reaction force on the existing segment 5. A stable excavation work can be performed. Since the assembly work of the new segment 5 ′ performed while the excavation jack 3 performs a stable excavation work can be performed without any contact with all the propulsion jacks 4 and without any restrictions on the replacement, The new segment 5 ′ can be smoothly assembled in a ring shape by a flexible work procedure.

  The state shown in FIG. 2 is shifted to the state shown in FIGS. 3 and 4, and a reaction force is applied to the assembled new segment 5 ′ to propel the rear cylinder 11. That is, the propulsion jack 4 is slightly extended and its one end (rod tip side) is brought into contact with the front end surface of the new segment 5 '. Then, the propulsion jack 4 is stretched by applying a reaction force to the front end face of the new segment 5 ′ (see FIG. 3), and the digging jack 3 is contracted by the stretched amount, thereby the rear barrel 11 is segmented. 5 (5 ') is propelled by one ring width (one stroke). Accordingly, the lock mechanism 8 is configured to follow the progress of the rear cylinder 11 (so-called ratchet mechanism) without retreating backward at all. The plate spring 7 of the mechanism 8 can be smoothly positioned to the position where the leaf spring 7 is hooked on the concave groove portion of the new segment 5 ′ (third step).

  Incidentally, FIG. 3 shows a state in which the propulsion jack 4 is extended and brought into contact with the front end face of the new segment 5 ′, and is further extended by about a half stroke (500 mm). Accordingly, the digging jack 3 is contracted by a half stroke (500 mm).

  Then, as shown in FIG. 4, after the shield machine is propelled by the segment 1 ring width (one stroke), the propulsion jack 4 is contracted to return to the initial state as shown in FIG. Fourth step).

  In this way, the propulsion jack 4 according to the present invention takes a reaction force on the new segment 5 ′ for propelling the rear barrel 11, and the new segment 5 for digging the front barrel 10 as in the prior art. Therefore, the propulsion jack 4 can be labor-saving compared to the conventional technology. Further, the propulsion jack 4 according to the present invention only needs to extend and contract all the propulsion jacks 4 at the same time. Like the prior art, some propulsion jacks and the remaining propulsion jacks are individually expanded and contracted, and the reaction force is increased. Therefore, the control mechanism of the propulsion jack 4 can be simplified as compared with the prior art.

  The above is the process of assembling the one-segment segment 5 ′. By repeating the first to fourth steps in sequence, the excavation work by the excavator 1 and the segment 5 (5 ′) by the elector apparatus 2 are performed. Thus, a shield construction method in which the assembling operations are performed at the same time becomes possible (the invention according to claim 2).

  FIG. 9 shows a shield machine according to claim 3, and FIGS. 9 to 12 show stepwise a high-speed construction shield method using the shield machine according to claim 1. As shown in the example, the shield machine that realizes the high-speed construction shield method can be implemented without using the propulsion jack 4 (inventions according to claims 1 and 3).

  That is, in the shield machine according to the second embodiment, the front barrel 10 provided with the shield drilling device 1 on the front surface and the rear barrel 11 including the erector device 2 for assembling the segments 5 and 5 ′ are axially moved by the drilling jack 3. The inner surface 11b of the rear part of the rear cylinder 11 of the shield machine is configured to follow the progress of the rear cylinder 11, and the concave groove 15 provided in the circumferential direction of the outer peripheral surface of the existing segment 5 or A locking mechanism 8 is provided that can be hooked on the ridge portion 16 to take a reaction force and extend the digging jack 3, and a control device that causes the digging jack 3 to extend and contract is provided. invention).

  In the high-speed construction shield method using this shield machine, first, as shown in FIG. 9, the excavation jack 3 is contracted to an initial state, and the lock mechanism 8 is moved to the concave groove portion 15 (or ridge) of the existing segment 5. Part 16) is applied to take a reaction force (first step). Next, as shown in FIG. 10, the front jack 10 is expanded by one ring width of the segments 5, 5 ′ by extending the digging jack 3 that takes a reaction force on the existing segment 5 by the lock mechanism 8, Meanwhile, one ring of the new segment 5 ′ is assembled by the erector device 2 built in the rear cylinder 11 (second step). Subsequently, as shown in FIGS. 11 and 12, the circumferential frictional force of the front barrel 10 is used to contract the excavation jack 3 to propel the rear barrel 11 by the width of the segment 1 ring. The mechanism 8 is hooked on the concave groove portion 15 or the convex strip portion 16 of the new segment 5 ′ (third step). Hereinafter, the excavation work and the segment assembly work are performed at the same time by sequentially repeating the first process to the third process (the invention according to claim 1).

  That is, the technique according to the second embodiment is based on the technical idea of propelling the rear cylinder 11 without using the propulsion jack 4 by using the circumferential frictional force of the front cylinder 10 to contract the excavation jack 3. Standing. In order to make effective use of the peripheral frictional force of the front barrel 10, it is preferable to provide a large number of acutely tapered protrusions on the outer peripheral surface of the front barrel 10.

  As described above, the embodiments have been described with reference to the drawings. However, the present invention is not limited to the illustrated embodiments, and design modifications and applications that are normally performed by those skilled in the art are within the scope of the technical idea. Note that it includes the range of variations.

  For example, FIG. 13 shows a different embodiment. In this embodiment, the inflatable / shrinkable bag body 17 is fixed by pressing the locking mechanism 8 against the existing segment 5 side between the locking mechanism 8 (plate spring 7) and the rear inner surface 11b of the rear barrel 11. (Embodiment of claim 8). The bag body 17 is normally contracted and installed on the inner side surface 11b of the rear part, and is expanded at a stage where the lock mechanism 8 is hooked on the convex strip 16 (or the concave groove 15) of the existing segment 5. The lock mechanism 8 is pressed against the existing segment 5 and fixed.

  That is, the bag body 17 is used for assisting the locked state of the locking mechanism 8 to the concave groove portion 15 (or the ridge portion 16). Therefore, when the bag body 17 is installed and implemented, it is not always necessary to use the leaf spring 7 that is the elastic member, but a bar-shaped material that can be hooked on the concave groove portion 15 (or the ridge portion 16). It can also be implemented.

It is sectional drawing which showed the initial state of the high-speed construction shield method by the shield machine which concerns on Example 1. FIG. It is sectional drawing which showed the state which constructs an excavation operation | work and a segment assembly operation | work simultaneously about the high-speed construction shield method by the shield machine based on Example 1. FIG. It is sectional drawing which showed the state which stretches a propulsion jack and takes the reaction force on the front end surface of a new installation segment, and propels a back trunk about the high-speed construction shield method by the shield machine which concerns on Example 1. FIG. It is sectional drawing which showed the state which extended the stroke of the propulsion jack which took the reaction force to the front-end surface of a newly installed segment 1 stroke about the high-speed construction shield method by the shield machine which concerns on Example 1, and propelled the back trunk. It is sectional drawing which expanded and showed the locking mechanism shown in FIG. It is the front view which showed roughly the installation state of the leaf | plate spring of a locking mechanism. It is sectional drawing which showed the variation of the locking mechanism. It is sectional drawing which showed the variation of the locking mechanism. It is sectional drawing which showed the initial state of the high-speed construction shield construction method by the shield machine which concerns on Example 2. FIG. It is sectional drawing which showed the state which constructs an excavation operation | work and a segment assembly operation | work simultaneously about the high-speed construction shield method by the shield excavation machine which concerns on Example 2. FIG. It is sectional drawing which showed the state which pushes up a back trunk about the high-speed construction shield construction method by the shield machine which concerns on Example 2. FIG. It is sectional drawing which showed the state which propelled the back trunk | dye by 1 stroke about the high-speed construction shield construction method by the shield machine which concerns on Example 2. FIG. It is sectional drawing which showed the variation of the locking mechanism.

Explanation of symbols

1 Drilling device (cutter head)
DESCRIPTION OF SYMBOLS 2 Electa device 3 Excavation jack 4 Propulsion jack 5 Existing segment 5 'New segment 6 Seam seal 7 Leaf spring 8 Lock mechanism 9 Tail seal 10 Front trunk 11 Rear trunk 11a Insertion part 11b Non-insertion part 12 Mounting plate
13 Contact plate 14 Mounting plate 15 Groove portion 16 Convex portion 17 Bag

Claims (8)

In the shield method of excavating with a shield excavator formed by connecting a front cylinder equipped with a shield excavator on the front and a rear cylinder incorporating an erector apparatus for assembling a segment slidably in the axial direction by an excavating jack,
On the inner surface of the rear part of the rear body of the shield machine, follow the progress of the rear cylinder and hook it on the concave groove or ridge provided in the circumferential direction of the outer peripheral surface of the existing segment. Provide a locking mechanism that can be extended,
A first step in which the digging jack is contracted to an initial state, and the locking mechanism is hooked on the concave groove portion or the ridge portion of the existing segment to take a reaction force;
The forward jack is extended by one ring width of the segment by extending a digging jack that takes a reaction force on the existing segment by the lock mechanism, and in the meantime, a groove is formed in the circumferential direction of the outer peripheral surface by an erector device built in the rear cylinder. Or a second step of assembling one ring of a new segment having a ridge,
A third step of contracting the digging jack to propel the rear barrel by one ring width of the segment, and hooking the locking mechanism to the groove or ridge of the new segment;
Hereinafter, the high-speed construction shield construction method is characterized in that the excavation operation and the segment assembly operation are performed at the same time by sequentially repeating the first to third steps. In the shield method of excavating with a shield excavator formed by connecting a front cylinder equipped with a shield excavator on the front and a rear cylinder incorporating an erector apparatus for assembling a segment slidably in the axial direction by an excavating jack,
A propulsion jack that takes the reaction force on the front end face of the new segment is provided on the inner surface of the front part of the rear body of the shield machine, and the outer surface of the existing segment follows the progress of the rear cylinder on the inner surface of the rear part A locking mechanism is provided that allows the digging jack to be stretched by hooking it to the groove or ridge provided in the circumferential direction and taking a reaction force,
A first step in which the excavation jack and the propulsion jack are contracted to an initial state, and the locking mechanism is hooked on the concave groove portion or the convex strip portion of the existing segment to take a reaction force;
The forward jack is extended by one ring width of the segment by extending a digging jack that takes a reaction force on the existing segment by the lock mechanism, and in the meantime, a groove is formed in the circumferential direction of the outer peripheral surface by an erector device built in the rear cylinder. Or a second step of assembling one ring of a new segment having a ridge,
One end of the propulsion jack is brought into contact with the front end surface of the new segment, the propulsion jack is stretched by taking a reaction force on the front end surface of the new segment, and the excavation jack is contracted by the stretched amount. A third step of propelling the rear barrel by one ring width of the segment, and hooking the locking mechanism on the concave groove or ridge of the new segment;
A fourth step of contracting the propulsion jack and returning it to the initial state;
Hereinafter, the first to fourth steps are sequentially repeated to perform excavation work and segment assembly work at the same time. In the shield machine, the front cylinder provided with the shield excavator on the front and the rear cylinder containing the erector device for assembling the segments are connected to each other by an excavating jack so as to be slidable in the axial direction.
On the inner surface of the rear part of the rear body of the shield machine, follow the progress of the rear cylinder and hang it on the concave groove or ridge provided in the circumferential direction of the outer peripheral surface of the existing segment. Is provided with a lock mechanism that can be extended,
A shield excavator characterized in that a control device for extending and retracting the excavation jack is provided. In the shield machine, the front cylinder provided with the shield excavator on the front and the rear cylinder containing the erector device for assembling the segments are connected to each other by an excavating jack so as to be slidable in the axial direction.
On the inner surface of the front part of the rear body of the shield machine, a propulsion jack that takes a reaction force is provided on the front end surface of the new segment provided with a groove or ridge in the circumferential direction of the outer peripheral surface. A locking mechanism is provided on the side surface to follow the progress of the rear cylinder and to be able to extend the digging jack by using a reaction force by hooking it to the concave groove or ridge provided in the circumferential direction of the outer peripheral surface of the existing segment. Being done,
A shield excavator characterized in that a control device for extending and retracting the excavation jack and the propulsion jack is provided.   The shield excavator according to claim 3 or 4, wherein the excavation jack has a stroke substantially equal to one ring width of the segment.   5. The shield machine according to claim 4, wherein the propulsion jack has a stroke of approximately one ring width of the segment.   The locking mechanism comprises a plurality of leaf springs arranged in the axial direction in the circumferential direction of the rear cylinder, and each leaf spring has its front end fixed to the inner surface of the rear part of the rear cylinder and the rear end opened. The rear end portion of the opened leaf spring is configured to follow the progress of the rear trunk while elastically contacting the outer peripheral surface of the existing segment. The shield machine described in 1.   8. An inflatable / shrinkable bag body is provided between the locking mechanism and the inner surface of the rear part of the rear barrel, wherein the locking mechanism is pressed against the existing segment side and fixed. A shield machine according to any one of the above.

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