JP3840219B2 - Shield excavator - Google Patents

Description

  The present invention relates to a shield excavator in which a pipeline is formed while excavating a tunnel in the ground, and then removed backward through the pipeline and can be collected.

  In tunnel construction to form a conduit in the ground, a shield excavator is excavated from the start shaft side toward the arrival shaft, and every time a fixed length tunnel is excavated, the shield excavator is followed by a fixed length. Shield excavation that reached the final shaft by forming a pipeline by sequentially adding the buried pipes, or by lining the drilling wall according to the excavation while assembling the segments in the machine In general, the aircraft is generally recovered from the reach shaft and reused.

However, when the reaching shaft is a narrow shaft such as an existing manhole, or when the reaching shaft is not provided, or when the reaching shaft is not provided such as when two shield excavators are docked in the ground Therefore, after the tunnel excavation is completed, the shield excavator must be disassembled to a size that can be carried out by gas fusing, etc., and removed and recovered to the start shaft side through the tunnel. However, there is a problem in that the collection work requires a lot of labor and labor, and the parts that can be reused are limited.

  For this reason, in the shield excavator described in Patent Document 1, the outer shell is formed in a double structure of an outer cylinder and an inner cylinder whose outer diameter is smaller than the diameter of the pipe, and these inner and outer cylinders. The body is divided into front and rear body parts that can be refracted from each other. Furthermore, the cutter head for excavating the ground in front of the opening end of the outer cylinder is formed so as to be able to be reduced so that the outer diameter thereof is smaller than the inner diameter of the pipe line. Further, a plurality of shield jacks that cover the segment on the excavated wall surface and take the thrust reaction force to propel the shield excavator are attached to the inner cylinder.

JP 2001-317285 A

  According to the above shield excavator, after the excavation of the tunnel is completed, the outer cylinder body is buried and the cutter head and the inner cylinder can be collected through the pipe line. Since this is mounted on the inner peripheral surface side, the following problems arise. That is, when the middle-folded jack is attached to the inner peripheral surface side of the inner cylinder, in order to transmit the expansion / contraction force of the middle-folded jack to the middle-folded portion of the outer cylinder, the front barrel and outer cylinder of the inner cylinder In addition to having to connect the front barrel portion of the inner cylinder and the rear barrel portion of the inner cylindrical body and the rear barrel portion of the outer cylindrical body extremely firmly, there is a jack having a large propulsive force as a bent jack. Necessary and expensive.

  In addition, when the shield jack is attached to the inner peripheral surface side of the inner cylinder, the axis of the jack is positioned inside the tunnel considerably more than the front end surface of the segment covering the tunnel excavation wall surface. When the spreader attached to the tip of the rod of the shield jack is brought into contact with the front end surface of the segment and the shield excavator is propelled by applying a reaction force to the segment, the operating state of the shield jack becomes unstable. In other words, the propulsive force of the rod of the shield jack acts on the segment via the spreader attached in a state of being refracted outward from the tip of the rod. Due to the large displacement inside the tunnel with respect to the end surface, the refraction length of the spreader becomes long, and a large bending moment is generated in the rod of the shield jack during propulsion, and the rod is bent or the cylinder portion of the jack is damaged. In addition, there is a problem that cracks occur in the rod itself.

For this reason, a shield jack needs to use a large jack like the above-mentioned bent jack, and the cost increases. Furthermore, since these half-folded jacks and shielded jacks are arranged on the inner peripheral surface side of the inner cylinder as described above, the work space in the machine becomes extremely narrow, obstructing work, and tunneling. There is a possibility that the excavation cannot be performed smoothly. In particular, when the shield excavator has a small diameter, there is a problem that workability is further deteriorated.

  The present invention has been made in view of the above-mentioned problems, and the object of the present invention is to widen the work space in the machine to enable smooth and efficient excavation of the tunnel and to correct the direction. It is another object of the present invention to provide a shield excavator that can be reliably performed, and that can be easily and reliably recovered and removed to the start shaft after the tunnel excavation.

In order to achieve the above object, a shield excavator according to the present invention is a shield excavator that forms a pipeline in a tunnel while excavating the tunnel in the ground as described in claim 1, outer cylinder and an outer diameter and an inner cylinder of smaller diameter than the inner diameter of the pipe, the front cylinder and the outer cylinder body are formed respectively on the double cylinder structure of the outer tubular section and the inner tubular section portion And a bent portion integrally provided in the front half of the outer cylindrical portion of the rear barrel is connected to the inner peripheral surface of the rear cylindrical portion of the outer cylindrical portion so as to be bent. In addition, the inner peripheral surface of the outer cylinder and the middle bent jack connecting the inner peripheral surfaces of the outer cylindrical portions in the front and rear barrel portions in an annular hollow chamber formed between the inner and outer cylindrical portions. On the other hand, the shield jacks that are detachably fixed to the circumferential direction are arranged at predetermined intervals in the circumferential direction. Cylindrical body is divided into a said outer cylindrical body as well as front section and a rear body portion with being withdrawable to inserted rearwardly into the inner peripheral surface of the inner tubular portion of the outer cylindrical body and the The split part is arranged so as to overlap the inside of the split part between the front and rear body parts in the inner cylindrical part of the outer cylindrical body, and the inner peripheral surfaces of these front and rear body parts can be refracted by a connecting member made of an extension jack. connected to, together are detachably connected to front section of the inner cylinder to the inner tubular portion of the front section of the outer cylindrical body, the outer tube in the partition wall which is provided at the front of the front section A cutter head which excavates the ground in front from the open end of the body and whose outer diameter can be reduced to be smaller than the inner diameter of the pipe is rotatably supported. When collecting the body by pulling it back, a connecting bracket is used between the opposing ends of the front and rear torso parts of the inner cylinder. Connected integrally, characterized in that it is adapted to secure.

In thus constituted shield excavator, the invention of claim 2 is characterized in that it comprises a erector apparatus for assembling a segment to the rear end of the barrel after the inner cover.

  According to the shield excavator of the present invention, the outer cylindrical body composed of the front and rear body portions that are refractably connected to each other via the bent portion, and the outer cylindrical body that is disposed in the outer cylindrical body is detachable from the outer cylindrical body. And an outer shell structure of an excavator which is divided into front and rear body portions in the same manner as the outer cylindrical body and has an outer diameter smaller than the inner diameter of the pipe. In the above, since the middle-folded jack is mounted between the front and rear body parts of the outer cylinder body, the operating force can be directly transmitted between the front and rear body parts of the outer cylinder body without using a large middle-folding jack. However, it is possible to reliably obtain the bending angle of the outer cylinder necessary for correcting the direction of the shield excavator and excavating the curved tunnel with a relatively small expansion / contraction force.

Furthermore, since the bent jack is not disposed on the inner peripheral surface side of the inner cylinder as described above, a large work space in the machine can be secured, work can be facilitated and work efficiency can be improved. Can be improved. Because Moreover, it is linked to refraction between the front and rear body portion of the inner cylinder by a connecting member, with a predetermined angle from the center-folding portion between the front and rear trunk portion of the outer cylindrical body by the operation of the jack break in the refractive Then, following the refraction, the front and rear body portions of the inner cylinder body can be smoothly and refracted in the same direction integrally with the front and rear body portions of the outer cylinder body, and can be rotatably supported by the partition wall of the inner cylinder body. The cutter head can be easily directed in a predetermined excavation direction.

  Further, the inner cylinder is configured to be able to be pulled out from the outer cylinder toward the rear, and the outer diameter is formed smaller than the inner diameter of the pipe, and the inner cylinder is rotatable on the partition wall of the inner cylinder. Since the outer diameter of the supported cutter head is also reduced to be smaller than the inner diameter of the pipe line, after the excavation of the tunnel is completed, the cutter head is reduced and then the inner cylinder is pulled back. With the outer cylinder remaining on the excavation wall surface, the inner cylinder can be easily collected and removed together with the cutter head using the inner peripheral surface of the outer cylinder as a guide surface.

Furthermore, the front and rear body portions of the outer cylindrical body are formed in a double structure of an outer cylindrical portion and an inner cylindrical portion, and the front and rear barrels are formed in an annular hollow chamber formed between these inner and outer cylindrical portions. Since the bent jacks connecting the outer cylinders of the parts are arranged at predetermined intervals in the circumferential direction, they are not obstructed by various devices in the machine and also obstruct the devices. Without using the hollow chamber between the inner and outer cylindrical portions of the outer cylindrical body, it is possible to easily arrange a plurality of middle-folded jacks at predetermined positions, and between the inner peripheral surfaces of the front and rear body portions of the outer cylindrical portion. The structure connected by these middle folding jacks can be configured, and as described above, the operating force of these middle folding jacks is directly applied to the front and rear body parts of the outer cylindrical part connected via the middle folding parts. The direction of the shield excavator can be corrected accurately and smoothly. Can.

According to the second aspect of the present invention, since the erector device for assembling the segment is provided at the rear end of the rear barrel portion of the inner cylindrical body, it is easy to cover the segment with respect to the excavation wall surface excavated by the shield excavator. In addition, after the tunnel excavation is completed, the erection device can be recovered and removed integrally with the inner cylinder without disassembling.

  As described above, when the pipe line to be constructed on the excavation wall surface is formed by lining the segment, the shield jack for excavating the shield excavator in the hollow chamber of the outer cylindrical body is attached at predetermined intervals in the circumferential direction. Therefore, the shield jacks can be arranged so that the axial extension line of the rod is as close to or as close as possible to the front end surface of the segment. Without causing damage to the jack or bending of the rod, the reaction force can be directly applied to the segment and its propulsive force can be transmitted to the shield excavator without fail, and the shield jack is similar to the above-mentioned bent jack. Since it is mounted along the inner peripheral surface of the front and rear barrels of the outer cylinder in the outer cylinder, a large working space in the machine can be secured. Can be performed with good smoothly and efficiently the variety of work.

  Next, a specific embodiment of the present invention will be described with reference to the drawings. In FIG. 1, a shield excavator has an outer shell and a pipe line T formed by a segment S whose outer diameter covers the excavation wall surface. The outer cylinder 1 is formed with a slightly larger diameter than the outer diameter, and the inner cylinder 2 is formed with an outer diameter smaller than the inner diameter of the pipe T. A partition wall 3 is provided in the front portion of the body 2, and an outer peripheral end surface thereof is integrally fixed to an inner peripheral surface of the inner cylinder body 2, and the ground surface facing the opening end of the outer cylinder body 1 on the partition wall 3. The cutter head 4 for excavating the material is rotatably supported.

  The outer cylinder 1 is formed in a double cylinder structure of an outer cylinder 1A and an inner cylinder 1B having a certain length, and between the front and rear ends of the inner and outer cylinders 1A and 1B. Are integrally connected by the annular connecting plates 1C and 1D, and the opposing surfaces of the intermediate portions in the lengthwise direction are also integrally connected by the connecting piece 1E, whereby the inner peripheral surface and the inner side of the outer cylindrical portion 1A A hollow chamber 5 having an annular cross section is formed between the outer peripheral surfaces of the cylindrical portion 1B. Further, the outer cylindrical portion 1A and the inner cylindrical portion 1B are divided into front and rear, and the inner and outer front barrel portions 1A1, 1B1 and the inner and outer front barrel portions 1A1, 1B1 are shorter than the inner and outer front barrel portions 1A2, 1B2. Is formed. The outer cylinder portion 1A has a protruding front end portion 1A3 that protrudes forward from the outer peripheral end of the front connection plate 1C by a predetermined length.

  In addition, a central bent portion 6 having an outer peripheral surface formed as a convex arcuate curved surface 6a is provided integrally with the front half portion of the rear barrel portion 1A2 in the outer cylindrical portion 1A, and the intermediate bent portion 6 is provided as the outer cylindrical portion 1A. Is connected to the inner peripheral surface of the rear end portion of the front barrel portion 1A1 through a sealing material 10 so as to be refractable, and the outer peripheral surface of the rear end portion of the folded portion 6 has a constant length equal to the inner diameter of the front barrel portion 1A1. The inner peripheral surface of the front end portion of the cylindrical rear outer shell portion 7 is fixed, and the rear outer shell portion 7 extends rearward from the rear trunk portion 1A2.

  A plurality of half-folded jacks 8 for refracting the inner and outer front barrels 1A1 and 1B1 in the outer cylindrical body 1 in a desired direction with respect to the inner and outer rear barrels 1A2 and 1B2 are arranged in the annular hollow chamber 5. Specifically, as shown in FIG. 2, four sets of two middle-folding jacks 8 and 8 having a small interval are provided as a set, and four sets are arranged vertically and horizontally, respectively. The front end of the bent jack 8 is connected by pivotally pivoting to a bracket 11 projecting from the front inner peripheral surface of the front body 1A1 in the outer cylinder 1A, and the rear end is connected to the outer cylinder 1A. The rear body 1A2 is connected to the bracket 12 projecting on the inner peripheral surface of the middle bent portion 6 by pivotably pivoting.

  Further, a plurality of shield jacks 9 are disposed in the annular hollow chamber 5 together with the folding jack 8 at regular intervals in the circumferential direction, and these shield jacks 9 are arranged at the rear barrel of the outer cylindrical portion 1A. In a state of being placed on the inner peripheral surface of the above-mentioned middle-folded portion 6 of the portion 1A2, it is fixed removably by an appropriate fixing tool (not shown), and the rear end portion is connected to the above-mentioned annular connecting plate 1D on the rear side. The spreader 9b attached to the tip of the rod 9a is pressed against the front end face of the segment S constituting the pipe T.

  The inner cylindrical body 2 has an outer diameter smaller than the inner diameter of the inner cylindrical portion 1B of the outer cylindrical body 1, and is inserted into the inner cylindrical portion 1B so as to be able to be pulled out rearward. . Specifically, guide rollers 13 are rotatably supported at a plurality of positions in the front and rear body portions 1B1 and 1B2 of the inner cylindrical portion 1B in the front and rear direction and the circumferential direction, and these guide rollers 13 support the outer peripheral surface. However, the inner cylindrical body 2 is inserted into the outer cylindrical body 1 so as to have a double structure, and a predetermined interval exists in the length direction on the inner peripheral surface of the front barrel portion 1B1 of the inner cylindrical portion 1B. A plurality of sealing materials 10 are provided around the outer peripheral surface of the front barrel portion 2A of the inner cylindrical body 2 so as to have water-stopping properties.

  The inner cylindrical body 2 is also divided into a front body portion 2A and a rear body portion 2B in the same manner as the outer cylindrical body 1, and the length of the front body portion 2A is the front body of the inner cylinder portion 1B of the outer cylinder body 1. Is formed to have the same length as the part 1B1, and the divided part between the front and rear body parts 2A and 2B overlaps the inside of the divided part between the front and rear body parts 1B1 and 1B2 in the inner cylindrical part 1B of the outer cylinder 1 Further, the rear end portion of the front barrel portion 2A of the inner cylindrical body 2 is detachably attached to the front barrel portion 1B1 of the inner cylindrical portion 1B of the outer cylindrical body 1 by a connector 14, for example, a bolt. And connecting members 15 made of a plurality of expansion jacks (the same number as the middle folding jacks 8) are arranged so as to overlap the inner side of each middle folding jack 8 along the inner peripheral surface of the inner cylindrical body 2. The front and rear ends of the connecting member 15 are pivotally attached to the inner peripheral surfaces of the front and rear body parts 2A and 2B of the inner cylinder 2 so that the front and rear body parts 2A and 2B can be bent. To have.

  In addition, an erector device 16 for assembling the segment S at the rear end of the rear barrel portion 2B of the inner cylindrical body 2 is provided to project rearward from the rear barrel portions 1A2 and 1B2 of the outer cylindrical body 1. In this erector device 16, a circular rail member 16a having an outer diameter smaller than the inner diameter of the pipe line T is fixed to the rear end portion of the rear barrel portion 2B of the inner cylinder portion 2, and a motor (not shown) is attached to the circular rail member 16a. 1) A ring body 16b that is rotated by driving is rotatably supported, and an elector 16c is mounted on the ring body 16b.

  As shown in FIGS. 1 and 3, the cutter head 4 in which the rotation center shaft 17 is rotatably supported at the center portion of the partition wall 3 provided at the front portion of the inner cylindrical body 2 has its rotation center shaft. The length is shorter than the radius of the inner peripheral surface of the inner cylindrical portion 1B of the outer cylindrical body 1 from the front end of 17 toward the direction orthogonal to the rotation center axis 17 (outer radial direction) and on both sides of the front surface. A plurality of (four in the figure) spokes 4a projecting from a plurality of cutter bits 4c are provided radially, and an arc shape is formed between the side surfaces facing the outer ends of the adjacent spokes 4a, 4a. Further, the spokes 4a are formed into cylindrical hollow spokes 4a whose outer end surfaces are open, and the outer spoke pieces 4b are accommodated therein and attached to the spokes 4a. The outer spoke piece 4b is moved to the open end of the hollow spoke 4a by the operation of the jack 18. By al infested are telescopically configured spoke length to fit in the inner peripheral plane of the inner cylinder 2 from the length to reach the outer peripheral surface of the outer cylindrical body 1 length. A plurality of cutter bits 4c are projected from both sides of the front surface of the outer spoke piece 4b, and a center bit 4c 'is projected from the front surface of the rotation center shaft 17.

  In addition, arm members 19 project from the rear outer peripheral portions of the cutter head 4 toward the rear, and the rear ends of these arm members 19 are integrally connected by an annular frame member 20 to form the annular shape. The frame member 20 is rotatably supported on the inner peripheral surface of the front end portion of the inner cylinder 2 projecting forward from the partition wall 3, and the internal gear 21 is fixed to the rear end surface of the annular frame member 20. On the other hand, a drive motor 22 is mounted on the rear surface of the outer peripheral portion of the partition wall 3 and a small gear 23 fixed to the rotation shaft of the drive motor 22 is engaged with the internal gear 21, and the cutter head 4 is rotated by the drive motor 22. It is configured to make it.

  Further, a space between the rear surface of the cutter head 4 and the front surface of the partition wall 3 is formed in the earth and sand chamber 24 in which the earth and sand excavated by the cutter head 4 is taken and temporarily retained. The excavated sediment is discharged backward through the soil means 25. As shown in FIG. 1, the earth discharging means 25 is a screw conveyor, and its front end opening penetrates the lower part of the partition wall 3 so as to face the lower end of the earth and sand chamber 24 and from the partition wall 3 toward the rear. It is arranged in a state inclined obliquely upward.

  The arm member 19 of the cutter head 4 is provided with a telescopic stirring rod 26 protruding in the outer diameter direction, and a cover 32 is provided on the upper peripheral portion of the rear outer shell portion 7 of the outer cylinder 1. A back-filling injection pipe 33 covered with is disposed.

  Next, in order to construct the pipe line T in the ground by the shield excavator configured as described above, first, this shield excavator is installed in a start shaft (not shown), and the outside of the cutter head 4 While the spoke piece 4b is extended to rotate the cutter head 4 in a diameter expanded state, the front ground is excavated from the projecting front end 1A3 of the outer cylinder 1, and the segment S is assembled to the excavation wall t to assemble the pipe. A road T is formed. The shield excavator is propelled by pressing the spreader 9b attached to the tip of the rod of the shield jack 9 against the front end surface of the segment S previously constructed on the excavation wall surface t and extending the rod 9a.

  At this time, the segment S is assembled by the erector device 16 in the rear outer shell portion 7 projecting rearward from the rear barrel portion 1A2 of the outer cylindrical portion 1A in the outer cylindrical body 1, and the rear side according to the progress of the shield excavator While being sent to the excavation wall surface t along the inner peripheral surface of the outer shell portion 7, all the shield jacks 9 are mounted on the inner peripheral surface of the rear barrel portion 1 A 2 of the outer cylindrical portion 1 A in the outer cylindrical body 1. As a result, the extension line of the axial center is as close as possible or abutted against the front end surface of the segment, and therefore, the reaction force is applied to the front end surface of the segment S without causing an excessive force such as bending to the rod 9a of the shield jack 9. Can be propelled in a stable state, and a large work space can be secured in the machine, so that work can be performed efficiently.

  The propulsive force of the shield jack 9 that takes the reaction force on the front end surface of the segment S is transmitted from the outer rear trunk portion 1A2 to which the shield jack 9 is fixed to the outer front trunk portion 1A1 via the middle bent jack 8. Further, the cutter head 4 is connected to the outer front barrel portion 1A1 from the front barrel portion 2A of the inner cylindrical body 2 detachably connected to the outer front barrel portion 1A1 by a connecting tool 14 such as a bolt through a partition wall 3 provided in the inner cylindrical body 2. Is transmitted to. At this time, the rear barrel portion 2B of the inner cylinder 2 is pulled forward by the connecting member 15 with the front barrel 2A and moves forward integrally.

  Further, when the direction of the shield excavator is corrected or the curved tunnel portion is excavated during tunnel excavation, the front trunk portions 1A1 and 1B1 of the inner and outer cylinders 1 and 2 are operated by operating the middle-folded jack 8. , 2A is refracted in a predetermined direction with respect to the rear body portions 1A2, 1B2, 2B. That is, the middle bent jack 8 on the side whose direction is to be changed is contracted, the opposite middle bent jack 8 is expanded, or the radially bent jacks 8 facing each other in the radial direction are contracted and extended at the same time. Then, the front barrel portion 1A1 of the outer cylindrical portion 1A of the outer cylindrical body 1 connecting the front end portion of the middle folding jack 8 has a predetermined angle in the direction in which it is desired to change the direction from the middle folding portion 6 with respect to the rear barrel portion 1A2. Refract. The refraction angle can be adjusted to be large or small depending on the amount of expansion / contraction of the bent jack 8.

  At this time, the front and rear body parts 1B1 and 1B2 of the inner cylinder part 1B of the outer cylinder 1 are integrally connected to the front and rear body parts 1A1 and 1A2 of the outer cylinder part 1A of the outer cylinder 1 and the inner cylinder 2 Since the front torso 2A is also integrally connected to the front torso 1B1 of the inner cylinder 1B of the outer cylinder 1 by the connector 14, the front torso 1A1 of the outer cylinder 1A of the outer cylinder 1 is the rear torso. When a predetermined angle is refracted with respect to the portion 1A2, the front barrel portion 1B1 of the inner cylinder portion 1B of the outer cylinder 1 and the front barrel portion 2A of the inner cylinder 2 are also simultaneously at the same angle in the same direction with respect to the rear barrel portions 1B2 and 2B. Refracts together. When the front body portion 2A of the inner cylinder 2 is refracted with respect to the rear body portion 2B, the connecting member 15 made of a contracting jack expands and contracts according to the degree of refraction.

  By tunneling the shield excavator in this state, the tunnel is excavated in a predetermined direction. As described above, since the middle folding jack 8 is attached to the outer cylindrical portion 1A side of the outer cylindrical body 1, the middle folding angle between the front and rear trunks of the outer cylindrical body 1 is directly adjusted to correct the direction of the shield excavator. And it can control smoothly. In addition, a large work space in the machine surrounded by the inner cylinder 2 can be secured.

Next, after excavating a tunnel of a predetermined length by a shield excavator to form a pipe line T, the shield excavator is removed to the start shaft side and collected. As shown in FIG. 5, first, the outer spoke piece 4b of the cutter head 4 is contracted into each spoke 4a so that the outer diameter of the cutter head 4 is smaller than the inner diameter of the inner cylindrical portion 1B of the outer cylindrical body 1. At the same time, the stirring rod 26 attached to the arm member 19 of the cutter head 4 is contracted. Further, the connecting tool 14 made of a bolt integrally connecting the inner front body 1B1 of the outer cylinder 1 and the front body 2A of the inner cylinder 2 is removed to move the inner and outer cylinders 1 and 2 in the front-rear direction. After enabling relative movement, the opposing end portions of the front and rear body portions 2A, 2B of the inner cylinder 2 are integrally connected and fixed by a connecting metal fitting 27 (shown in FIG. 6).

  After that, by extending the rod of the shield jack 9, a reaction force is applied to the front end of the segment S forming the pipe T, and the outer cylinder 1 is advanced as shown in FIG. The part 1A3 is brought into contact with the wall surface of the tunnel end with which the cutter head 4 is in contact. Next, as shown in FIG. 7, after laying the rail 28 on the bottom of the pipe T, a carriage (not shown) that travels on the rail 28 by removing the screw conveyor as the earth removing means 25 from the shield excavator. The pipe T is collected and removed to the start shaft side. Note that the rail 28 may be laid on the bottom of the pipe T for carrying in members such as segments from the starting vertical shaft side during tunnel excavation by a shield excavator.

  After removal of the soil removal means 25, a recovery guide roller 29 that rolls on the rail 28 is attached to the lower periphery of the inner cylinder 2, and the inner cylinder 2 including the cutter head 4 and the erector device 16 is moved backward. When pulled from the side by an appropriate pulling means (not shown), as shown in FIG. 8, the collection guide roller 29 rolls on the rail 28 and the inner cylinder 2 is pressed against the excavation wall t. The guide roller 13 attached to the inner cylindrical portion 1B of the outer cylindrical body 1 is pulled out from the outer cylindrical body 1 as a guide, removed to the start shaft side, recovered, and carried out of the tunnel. The inner cylinder 2 provided with the cutter head 4 and the elector device 16 carried out is used again for another shield work.

  On the other hand, the outer cylinder 1 covering the excavation wall surface t is left at the shield excavator reaching position, but the bent jack 8 and the shield jack 9 attached to the outer cylinder 1 are separated from the outer cylinder 1. Remove and collect and use for next shield construction as above.

  In the above embodiment, the spoke 4a of the cutter head 4 is a jack in which the spoke 4a is formed hollow, and the outer spoke piece 4b is retractably accommodated therein, and the spoke 4a is mounted in the spoke 4a. By the operation of 18, the outer spoke piece 4 b is projected and retracted from the open end of the hollow spoke 4 a so as to expand and contract the outer diameter of the cutter head 4. A fixed length spoke piece is attached to the outer end of the spoke 4 a. In the state where the spoke pieces are connected in a detachable manner, the cutter head 4 has an outer diameter substantially equal to the outer diameter of the outer cylindrical body 1, and in the state where the spoke pieces are removed, the outer diameter of the cutter head 4 is You may comprise so that it may become a diameter which can be removed through the inside of a pipe line.

  Further, the pipe line T is formed by assembling the segment S, but it is formed by sequentially propelling and embedding a pipe body such as a fume pipe by a propulsion method from the start shaft side following the shield excavator. In this case, the shield jack 9 is unnecessary.

The simplified longitudinal section side view of the whole shield excavator. The longitudinal cross-sectional view of the arrangement | positioning part of a middle bent jack and a shield jack. The front view of a cutter head. A simplified longitudinal side view of a state where a tunnel has been excavated to a predetermined length. The simplified vertical side view of the state which reduced the diameter of the cutter head. The simple vertical side view of the state which advanced the outer cylinder. The simplified longitudinal side view of the state where the removal to the rear and the collection work are completed. A simplified longitudinal side view of the state where it is removed and collected backward.

Explanation of symbols

1 outer cylinder
1A, 1B Inner and outer cylinder
1A1, 1B1 Inside / outside front body
1A2, 1B2 Inside / outside rear barrel 3 Bulkhead 4 Cutter head 5 Hollow chamber 6 Middle folded part 8 Middle folded jack 9 Shield jack
14 coupling
15 Connecting member
16 Electa device

Claims (2)

A shield excavator that forms a pipe in the tunnel while excavating the tunnel in the ground, and has an outer cylinder and an inner cylinder whose outer diameter is smaller than the inner diameter of the pipe , The outer cylinder is divided into a front barrel portion and a rear barrel portion formed in a double cylinder structure of an outer cylinder portion and an inner barrel portion, respectively, on the inner peripheral surface of the rear end portion of the outer cylinder portion in the front barrel portion. A bent portion integrally provided in the front half of the outer cylindrical portion in the rear barrel portion is connected to bendable, and the front and rear barrels are inserted into an annular hollow chamber formed between the inner and outer cylindrical portions. A bent jack that connects the inner peripheral surfaces of the outer cylindrical portion in the outer portion and a shield jack that is detachably fixed to the inner peripheral surface of the outer cylindrical body are arranged at predetermined intervals in the circumferential direction. On the other hand, the inner cylindrical body is inserted into the inner peripheral surface of the inner cylindrical portion of the outer cylindrical body so that it can be pulled out rearward. Distribution so as to overlap the inner side of the dividing portion between the front and rear waist portions of the inner tubular portion of the outer cylindrical body and is divided into a rear body portion and a front section in the same manner and the dividing portion the outer cylindrical body with being And the inner peripheral surfaces of these front and rear body parts are connected to each other by a connecting member made of a telescopic jack so that they can be bent, and the front body part of the inner cylinder body is attached to and detached from the inner cylinder part of the front body part of the outer cylinder body. together they are connected freely, drilled and outer diameter in front of the ground from the open end of the outer cylindrical body in the partition wall which is provided at the front of the front section can shrink to a diameter smaller than the inner diameter of the pipe The cutter head formed on the inner cylinder body is rotatably supported, and when the inner cylinder body is pulled out from the outer cylinder body for recovery, a connecting bracket is provided between the opposite end portions of the front and rear body parts of the inner cylinder body. The shield excavator is structured so as to be connected and fixed integrally with each other . Shield excavating machine according to claim 1, characterized in that it comprises a erector apparatus for assembling a segment to the rear end of the body part after the inner cylinder.

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