JP2014051839A - Propulsive force transmission mechanism and conduit construction method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a propulsive force transmission mechanism appropriately used for a conduit construction method with which, when a propulsion method is shifted to a shield method, segment pipes can be assembled in a perfect circle.SOLUTION: During a propulsion method, a propulsive force transmission mechanism 10 transmits a propulsive force of a base-pushing jack 62 installed in a departure pit A to a shield jack 41 within an excavator 40. The propulsive force transmission mechanism 10 is formed from: an adapter pipe 11 of which the outer diameter of a rear side face is substantially matched with an outer diameter of a propulsion pipe 20 and the outer diameter of a front side face is substantially matched with an outer diameter of a segment pipe 30 and which is connected with the propulsion pipe positioned at the head; an adjuster pipe 12 which is connected to the adapter pipe 11 and can be divided into a plurality of parts; a ruler ring 13 which is formed from a ring-shaped plate comprised of one member and is connected to the adjuster pipe; and a connection pipe 14 which is connected to the ruler ring 13, of which the front side face is abutted with a rear end portion of the shield jack 41 and which can be divided into a plurality of parts. The outer diameters of the adjuster pipe 12, the ruler ring 13 and the connection pipe 14 are substantially matched with the outer diameter of the segment pipe 30.

Description

  The present invention relates to a propulsion force transmission mechanism, and more particularly to a propulsion force transmission mechanism suitable for a hybrid propulsion method using both a propulsion method and a shield method. The present invention also relates to a pipeline construction method using this propulsive force transmission mechanism.

  Currently, in order to form a tunnel, a propulsion method and a shield method are known as construction methods for excavating earth and sand to form a conduit in the ground.

  The propulsion construction method is a construction method in which a propulsion jack (protruding jack) is installed in a start shaft, a pipe (propulsion pipe) is advanced by the propulsion jack, and a new pipe is installed at the rear end of the pipe.

  In the shield method, a propulsion jack (shield jack) is installed in the main body of the excavator, the main body of the excavator is advanced by the propulsion jack, and a new pipe is installed between the rear of the shield jack and the tip of the pipe (segment pipe). It is a construction method. The pipe body is disassembled into a plurality of segments and carried into the excavator, and the pipe body is assembled by an assembly device (elector) inside the excavator.

  In the shield method, the propulsion jack advances only the excavator body. On the other hand, in the propulsion method, the propulsion jack needs to advance the excavator body and all the propulsion pipes from the propulsion jack to the excavator body. Therefore, the propulsion method is not suitable for constructing a large-diameter or long-distance pipe line as compared with the shield method. And it is difficult for the propulsion method to construct a sharply curved pipe compared to the shield method.

  However, in the propulsion method, the propulsion pipe is cylindrical from the beginning, and the propulsion pipes can be easily connected. In the shield method, it is necessary to assemble the segment pipe from the segment inside the excavator body. In addition, since the segment pipe is shorter than the propulsion pipe, the segment pipe requires a larger number than the propulsion pipe. Therefore, the shield method has a longer construction period and higher costs than the propulsion method.

  Thus, the propulsion method is superior in terms of construction period and cost compared to the shield method. For this reason, the application of the propulsion method may be considered even in implementation projects where it is appropriate to construct a pipeline by the shield method, such as large diameters, long distances, and sharp curves. Although the conditions that have been detrimental to the propulsion method can be solved to some extent by the improvement of the propulsion method, there is still a possibility that the propulsion method cannot be excavated.

  Therefore, a “hybrid propulsion method” has been devised in which excavation is performed from the starting shaft to a predetermined distance by a propulsion method, and the excavation thereafter is changed to a shield method.

  In the hybrid propulsion method, the reaction force equipment and the propulsion jack in the start shaft use the propulsion method, and the excavator body uses the excavator used in the shield method. The propulsive force during the propulsion method is received by the propulsion jack (shield jack) inside the excavator, and after shifting to the shield method, construction is performed in the same way as the normal shield method.

  The propulsion pipe is located behind the excavator and has an outer diameter substantially the same as that of the excavator body. On the other hand, since the segment pipe is assembled inside the excavator body, the outer diameter thereof is smaller than the outer diameters of the excavator body and the propulsion pipe. Further, the propulsion method and the shield method differ greatly in the reaction force applied to the pipe body during the excavator propulsion and the control method. In the hybrid propulsion method, it is necessary to eliminate these differences.

  Therefore, for example, in the technique described in Patent Document 1, the tip of the propulsion pipe is reinforced with a reinforcing ring, and a connection ring is provided between the reinforcing ring and the rear end of the segment pipe (inner ring). The segment pipe is assembled inside the excavator and is brought into contact with a propulsion jack (shield jack).

  In the technique described in Patent Document 2, an adapter ring is installed to eliminate a difference in outer diameter between the propulsion pipe and the segment pipe, and a segment pipe and a thrust transmission ring are installed between the adapter ring and the shield jack. Further, a spacer is provided between the thrust transmission ring and the skin plate of the propulsion pipe.

Japanese Patent No. 2693904 JP 2008-057128 A

  Since the propulsive force in the propulsion method changes depending on the frictional state between the propulsion pipe and the surrounding ground, fine control is impossible. Therefore, a large propulsive force may be applied to the propulsion pipe compared to the design value. Therefore, the inner ring described in Patent Document 1 and the adapter ring and the thrust transmission ring described in Patent Document 2 are distorted, bent, cracked, chipped or the like in themselves or their joints by the propulsive force in the propulsion method. There is a fear.

  When these rings are distorted, the segment pipes connected to these front sides cannot be assembled into a perfect circle after the transition to the shield method. In particular, in the case of RC segment pipes, they are assembled in a perfect circle and exhibit their original performance in a sufficiently restrained state. Therefore, if a large force is applied while connected to a ring that is distorted or bent, cracks and chips will occur. There is a fear.

  In view of the above points, the present invention reliably and stably connects an existing building capable of assembling a segment pipe into a perfect circle and a seismic reinforcing frame when the propulsion method is shifted to the shield method. It is an object of the present invention to provide a method for constructing a pipeline and a propulsive force transmission mechanism suitably used in this method.

  The propulsive force transmission mechanism of the present invention constructs a pipeline using a propulsion pipe in the propulsion method section starting from the starting shaft, and uses a shield pipe method in the shield method section from the propulsion method section to the reaching shaft. In the pipeline construction method for constructing a pipeline using a propulsion force transmission mechanism for transmitting the propulsion force of the main jack installed in the start shaft to the shield jack inside the excavator, the outer shape of the rear side is The front and rear side contours of the propulsion tube substantially coincide with each other, the front side contour substantially coincides with the front and rear side contours of the segment tube, and the front and rear side surfaces of the propulsion tube positioned at the head come into contact with each other. And the adapter pipe connected to the front and rear side faces of the segment pipe are substantially the same as the front and rear side faces of the segment pipe, and the adapter pipe is connected to the adapter pipe by contacting the front side face and the rear side face. An adjustment pipe that can be divided into a plurality of parts, and a ring-shaped flat plate made of a single member, the outer shapes of the front and rear side faces substantially coincide with the outer shapes of the front and rear side faces of the segment pipe, and the rear side face is the front side face of the adjustment pipe The ruler ring that is in contact with the adjustment tube and the outer shape of both the front and rear side surfaces substantially match the outer shape of the front and rear side surfaces of the segment tube, and the front side surface and the rear side surface of the ruler ring are in contact with each other. It is comprised from the connection pipe which can be divided | segmented into plurality, and the rear-end part and front side surface of the said shield jack contact | abutted.

  According to the propulsive force transmission mechanism of the present invention, the ruler ring is composed of a single member, so that almost no distortion or deformation occurs during the propulsion method. Therefore, when the segment tube is assembled by removing the connection tube and connecting it to the front side surface of the ruler ring, it becomes possible to assemble the segment tube into a regular shape without any distortion. Further, since the connection pipe is connected to the ruler ring with the rear side abutting against the front side of the ruler ring made of one member, distortion and deformation that occur during the propulsion method are suppressed. Therefore, when the segment tube is assembled by connecting to the front side surface of the connection tube, it becomes possible to assemble the segment tube into a regular shape without any distortion.

  In the present invention, the case where the outlines are substantially the same includes the case where the outlines are considered to be approximated in consideration of the functional aspect in addition to being completely matched. Specifically, the step between the outer shape of the front and rear side surfaces of the propulsion tube and the outer shape of the front and rear side surfaces of the segment tube, that is, less than half of the outer diameter step when the outer shape of the propulsion tube and segment tube is circular, preferably 3 In the case of approximating within a range of 1 / min or less, it is regarded as substantially coincident in the present invention.

  In the propulsive force transmission mechanism of the present invention, it is preferable that each piece constituting the adjusting pipe is provided with a distance adjusting means capable of adjusting a distance between the piece and the skin plate of the excavator. In this case, by adjusting the interval by the interval adjusting means, it becomes easy to hold the adjusting tube formed of a plurality of pieces in a regular shape.

  The first pipeline construction method of the present invention is to construct a pipeline using a propulsion pipe by a propulsion method in a propulsion method section starting from a starting vertical shaft, and by a shield method in a shield construction method section from the propulsion method section to a reaching shaft. A pipe construction method for constructing a pipe using a segment pipe, wherein in the propulsion method section, the outer shape of the rear side is substantially the same as the front and rear side outlines of the propulsion pipe, and the outer shape of the front side is the front and rear of the segment pipe. The adapter tube and the propelling tube are connected by bringing the rear side surface of the adapter tube substantially coincident with the outer shape of the side surface into contact with the front side surface of the propelling tube located at the head, and the outer shapes of both front and rear sides are the segment tube The adjustment pipe and the adapter pipe are connected to each other by bringing the rear side face of the adjustment pipe substantially coincident with the front and rear side shapes of the adapter pipe into contact with the front side face of the adapter pipe. Shaped flat plate The ruler ring is formed so that the outer sides of the front and rear side surfaces substantially coincide with the front and rear side surfaces of the segment tube, and the ruler ring and the adjustment tube are connected by bringing the rear side of the ruler ring into contact with the front side of the adjustment tube. The outer shapes of the front and rear side surfaces substantially coincide with the outer shapes of the front and rear side surfaces of the segment tube, and the rear side surface of the connection pipe that can be divided into a plurality is brought into contact with the front side surface of the ruler ring, The adapter pipe, the adjustment pipe, the ruler ring, and the connection pipe in a state where the ring is connected and the rear end portion of the shield jack inside the excavator is in contact with the front side surface of the connection pipe The propulsion force of the main jack installed in the starting shaft is transmitted to the shield jack via the propulsion force transmission mechanism consisting of the following, after the propulsion method is completed, the connecting pipe is removed, and the front of the ruler ring Multiple segments on the side The segment pipe is constructed, and in the shield construction method section, while the propulsion reaction force of the shield jack is received by the leading segment pipe, the shield jack is extended to advance the excavator, Thereafter, the shield jack is shortened, and a plurality of segments are connected to the front side surface of the leading segment tube to construct a new segment tube.

  According to the first pipeline construction method of the present invention, the ruler ring is composed of a single member, so that almost no distortion or deformation occurs during the propulsion method. Therefore, when the segment tube is assembled by removing the connection tube and connecting it to the front side surface of the ruler ring, it becomes possible to assemble the segment tube into a regular shape without any distortion.

  In the first pipeline construction method of the present invention, the segment pipe is constructed in the space generated by removing the connection pipe. Therefore, the length in the front-rear direction of the segment pipe connected to the ruler ring is equal to or shorter than the length in the front-rear direction of the connection pipe. Therefore, in consideration of construction efficiency, it is preferable that the length in the front-rear direction of the connection pipe is substantially the same as the length in the front-rear direction of the segment pipe connected to the ruler ring.

  The second pipeline construction method of the present invention is to construct a pipeline using a propulsion pipe by a propulsion method in the propulsion method section starting from the start shaft, and by a shield method in the shield method section from the propulsion method section to the reaching shaft A pipe construction method for constructing a pipe using a segment pipe, wherein in the propulsion method section, the outer shape of the rear side is substantially the same as the front and rear side outlines of the propulsion pipe, and the outer shape of the front side is the front and rear of the segment pipe. The adapter tube and the propelling tube are connected by bringing the rear side surface of the adapter tube substantially coincident with the outer shape of the side surface into contact with the front side surface of the propelling tube located at the head, and the outer shapes of both front and rear sides are the segment tube The adjustment pipe and the adapter pipe are connected to each other by bringing the rear side face of the adjustment pipe substantially coincident with the front and rear side shapes of the adapter pipe into contact with the front side face of the adapter pipe. Shaped flat plate The ruler ring is formed so that the outer sides of the front and rear side surfaces substantially coincide with the front and rear side surfaces of the segment tube, and the ruler ring and the adjustment tube are connected by bringing the rear side of the ruler ring into contact with the front side of the adjustment tube. The outer shapes of the front and rear side surfaces substantially coincide with the outer shapes of the front and rear side surfaces of the segment tube, and the rear side surface of the connection pipe that can be divided into a plurality is brought into contact with the front side surface of the ruler ring, The adapter pipe, the adjustment pipe, the ruler ring, and the connection pipe in a state where the ring is connected and the rear end portion of the shield jack inside the excavator is in contact with the front side surface of the connection pipe The propulsion force of the main jack installed in the start shaft is transmitted to the shield jack via the propulsion force transmission mechanism, and after the propulsion method is completed, the propulsion reaction force of the shield jack is connected to the head of the connection. Received in a tube Therefore, the shield jack is extended to advance the excavator, and then the shield jack is shortened to connect a plurality of segments to the front side surface of the connection pipe, thereby constructing the segment pipe and shielding method section. Then, while receiving the propulsion reaction force of the shield jack at the head segment pipe, the shield jack is extended to advance the excavator, and then the shield jack is shortened to move the front of the head segment pipe. A new segment tube is constructed by connecting a plurality of segments to the side surface.

  According to the first pipeline construction method of the present invention, the ruler ring is composed of a single member, so that almost no distortion or deformation occurs during the propulsion method. The connecting pipe is connected to the ruler ring with its rear side abutting on the front side of this ruler ring, and the adjustment pipe is connected to the ruler ring with its front side abutting against the rear side of this ruler ring. It is suppressed. Therefore, when the segment tube is assembled by connecting to the front side of the ruler ring, there is little distortion and deformation of the adjustment tube, and it can be assembled into a regular shape into a segment tube without distortion by connecting to the ruler ring It becomes.

  In the second pipeline construction method of the present invention, the segment pipe is constructed in the space generated by extending the shield jack and advancing the excavator without removing the connection pipe. Therefore, in consideration of construction efficiency, it is preferable that the length in the front-rear direction of the adjustment pipe is longer than the length in the front-rear direction of the segment pipe connected to the connection pipe.

Explanatory drawing which shows the hybrid propulsion method concerning embodiment of this invention. The side view of a propulsion force transmission mechanism and an excavator. (A) is explanatory drawing which shows the hybrid propulsion method in the case of removing a connecting pipe, (b) is an enlarged view of the connection part of the propelling pipe and segment pipe | tube in (a).

  A propulsive force transmission mechanism 10 according to an embodiment of the present invention will be described with reference to the drawings.

  As shown in FIG. 1, the propulsive force transmission mechanism 10 is used in a hybrid propulsion method that uses both the propulsion method and the shield method, and has a function of transmitting propulsive force from the propulsion pipe 20 to the excavator 40 during the propulsion method. The propulsive force transmission mechanism 10 used in the hybrid propulsion method needs to eliminate the external level difference between the propulsion tube 20 and the segment tube 30 and transmit the propulsive force in the propulsion method to the excavator 40.

  As shown in FIG. 2, the propulsive force transmission mechanism 10 connects the leading end portion of the propulsion pipe 20 positioned at the head and a shield jack 41 inside the excavator 40. The propulsive force transmission mechanism 10 is configured by connecting an adapter pipe 11, an adjustment pipe 12, a ruler ring 13, and a connection pipe 14 in order from the tip of the propulsion pipe 20 toward the excavator 40.

  The adapter tube 11 is a short substantially tubular member having a steel structure, the outer diameter of the rear side surface substantially matches the outer diameter of the propulsion tube 20, and the outer diameter of the front side surface substantially matches the outer diameter of the segment tube 30. Thus, the outer surface is formed in a tapered shape so as to spread outward from the front side toward the rear side. By interposing the adapter tube 11, the outer diameter step between the propulsion tube 20 and the segment tube 30 can be eliminated. The adapter pipe 11 is not divided in the circumferential direction, is constituted by one member, and is always located outside the excavator 40.

  The adapter pipe 11 is provided with a lubricant injection hole 11a for injecting a lubricant between the excavation mine and the propulsion pipe 20 during the propulsion method. By injecting the lubricant, the friction during propulsion is reduced and propulsion is facilitated. Further, since the outer surface of the adapter tube 11 is formed in a tapered shape, the frictional resistance during propulsion is small. Since the propelling pipe 20 is not propelled during the shield construction method, it is not necessary to inject a lubricant, and the adapter pipe 11 is left in the ground.

  The adjusting pipe 12 is a substantially circular tubular member having a steel structure, and the outer diameter thereof substantially coincides with the outer diameter of the segment pipe 30. That is, the outer diameter of the adjustment pipe 12 substantially matches the outer diameter of the front side surface of the adapter pipe 11. The adjustment tube 12 has a rear surface abutting against the front surface of the adapter tube 11 and is fixed by using the adapter tube 11 and a bolt (not shown). The adjustment pipe 12 has a function of connecting the adapter pipe 11 located outside the excavator 40 to the ruler ring 13 and the connection pipe 14 inside the excavator 40, and the outer peripheral portion is located at the rear end of the excavator 40. In contact with the tail seal 42.

  The adjustment pipe 12 is configured to be divided in the circumferential direction and is assembled inside the excavator 40. This is because the cylindrical adjustment pipe 12 cannot be carried into the excavator 40 from the outside without damaging the tail seal 42.

  The ruler ring 13 is a steel-structured ring-shaped (hollow disk-shaped) flat plate member whose outer diameter substantially matches the outer diameter of the segment tube 30. That is, the outer diameter of the ruler ring 13 substantially matches the outer diameter of the adjustment pipe 12. The ruler ring 13 has its rear side abutted against the front side of the adjustment pipe 12 and is fixed to the adjustment pipe 12 using a bolt (not shown). Since the ruler ring 13 is a flat plate, it is not necessary to divide the ruler ring 13 as long as it is brought into the excavator 40 in advance. In addition, when the ruler ring 13 is divided and carried in, it is made into one member by welding or the like in the excavator 40. The ruler ring 13 is plated for rust prevention.

  The connection pipe 14 is a substantially circular tubular member having a steel structure, and the outer diameter thereof substantially coincides with the outer diameter of the segment pipe 30. That is, the outer diameter of the connecting pipe 14 substantially matches the outer diameter of the ruler ring 13. The connecting pipe 14 has a rear side abutting against the front side of the ruler ring 13 and is fixed to the ruler ring 13 with a bolt (not shown). The connecting pipe 14 is connected at its front side surface to a shield jack 41 inside the excavator 40, and transmits the propulsive force during the propulsion method to the excavator 40.

  The connection pipe 14 is configured to be divided in the circumferential direction, like the adjustment pipe 12. Further, the connecting pipe 14 is provided with a centering bolt 15 capable of adjusting the distance between the connecting pipe 14 and the skin plate 43 of the excavator 40. The centering bolt 15 corresponds to the interval adjusting means of the present invention. The centering bolt 15 is provided in each piece constituting the connecting pipe 14, and the perfect circle of the connecting pipe 14 during propulsion can be maintained by adjusting the distance between each piece and the skin plate 43. it can.

  Although not shown, a water stop seal is provided between the adapter pipe 11 and the adjustment pipe 12 and between the adjustment pipe 12 and the ruler ring 13. When the connecting pipe 14 is removed and the segment pipe 30 is installed, between the ruler ring 13 and the connecting pipe 14 when the connecting pipe 14 is left between the ruler ring 13 and the segment pipe 30. Install a water seal on

  Next, the excavator 40 will be described. The excavator 40 is a muddy water type shield excavator, and includes a skin plate (shield cylinder) 43 and an excavation unit 44 assembled to the skin plate 43. The skin plate 43 includes a front skin plate (front cylinder) 43a and a rear skin plate (rear cylinder) 43b. At the front end of the rear skin plate 43b, there is provided a spherical joint 45 that fits inside the rear end of the front skin plate 43a. The front skin plate 43a can be bent in any direction with respect to the rear skin plate 43b. . A plurality of middle-folded jacks 46 for connecting the front skin plate 43a and the rear skin plate 43b are provided at intervals in the circumferential direction, and the direction of the front skin plate 43a, i.e., the The direction of excavation can be adjusted.

  The rear skin plate 43b includes an erector 47 for assembling the segment 31 in a ring shape on the inner wall surface of the excavated tunnel, and a plurality of shields for moving the skin plate 43 forward by receiving the installed segment 31 as a reaction force. Jacks 41 are attached at intervals in the circumferential direction. A tail seal 42 is attached to the rear end of the rear skin plate 43b to seal a gap between the segment 31 and the rear skin plate 43b. Further, although not shown, a back-filling device for injecting and filling a back-filling material to the ground of the outer peripheral portion is provided.

  The excavation unit 44 includes a partition wall 48 and a cutter head 49 supported by the partition wall 48 that excavates the face in front of the front end of the skin plate 43.

  A drive unit 51 for rotating the cutter head 49 is provided on the back surface of the partition wall 48. The drive unit 51 includes a drive motor, a speed reducer, a gear, and the like, and the cutter head 49 can be driven to rotate with high torque via the drive shaft 52 by the drive force of the drive unit 51.

  The cutter head 49 includes a plurality of radial cutter spokes 49b to which cutter bits 49a are attached, and an overcutter that protrudes radially outward from an outer end portion of each cutter pork 49b by an unillustrated extension jack built in each cutter pork 49b. 49c.

  A space between the cutter head 49 and the partition wall 48 is a compartment 53. The compartment 53 is for filling excavated earth and sand together with muddy water to counteract the earth pressure from the face. On the rear side of the partition wall 48, a sediment transport device 54 that communicates with the compartment 53 is provided. The earth and sand carry-out device 54 is configured by a mud pipe 54a, a drain mud pipe 54b, and a mud pipe 54c connected to the mud pipe 54a and the mud pipe 54b and reaching the rear start shaft. Yes.

  Hereinafter, a tube construction method according to an embodiment of the present invention will be described with reference to FIG.

  In the propulsion method section C from the start shaft A to a predetermined distance, a pipe body is constructed by connecting the propulsion pipe 20 by the propulsion method.

  First, as shown in FIG. 1A, the start shaft A is formed by excavating the ground, and the reaction force receiving portion 61, the main push jack 62, and the like are installed in the start shaft A. Then, the excavator 40 is advanced by the reaction force of the main push jack 62 acting on the reaction force receiving portion 61. At this time, the backfill material 71 is injected and filled into the ground of the tail outer peripheral portion of the excavator 40 by the backfill injection device (see FIG. 3B).

  Thereafter, as shown in FIG. 1B, the propulsive force transmission mechanism 10 including the adapter pipe 11, the adjustment pipe 12, the ruler ring 13, and the connection pipe 14 is connected to the shield jack 41 and the main push jack inside the excavator 40. 62. Then, the propulsive force of the main push jack 62 is transmitted to the shield jack 41, and the excavator 40 is propelled integrally with the propulsive force transmission mechanism 10. Then, the propulsion pipe 20 is connected to the rear side surface of the adapter pipe 11 in the start shaft A. The propulsion pipe 20 may be configured to be divisible in the circumferential direction. Further, the propulsion tube 20 may be a fume tube.

  Thereafter, the propulsion pipe 20, the propulsive force transmission mechanism 10, and the excavator 40 are integrally propelled as a whole. A new propulsion pipe 20 is positioned in the space generated in the start shaft A by this propulsion, and is connected to the existing propulsion pipe 20 at the rear end. Such a process is repeated until the length of the propelling tube 20 reaches a predetermined distance.

  At the time of the propulsion method, the adjustment pipe 12 is fixed to the front and rear by an adapter pipe 11 and a ruler ring 13 both formed from one member, and the shape thereof is held in a perfect circle. The connecting pipe 14 is fixed at the rear by a ruler ring 13 formed from one member, and is adjusted so as not to be distorted by using a centering bolt 15, and the shape thereof is held in a perfect circle. The In addition, bolt holes are formed in the adjusting pipe 12 and the connecting pipe 14 in accordance with the bolt holes of the ruler ring 13 without forming bolt holes in advance on the connection surface of the adjusting pipe 12 and the connecting pipe 14 with the ruler ring 13. Thus, the shape can be made a perfect circle.

  The propulsive force in the propulsion method changes depending on the friction state between the propulsion pipe 20 and the surrounding ground. And it is difficult to finely adjust the propulsive force, and a large propulsive force may be applied as compared with the design value. Even if a large propulsive force is applied, distortion and deformation of the adjusting pipe 12 and the connecting pipe 14 composed of pieces divided in the circumferential direction are suppressed, and the propulsive force transmission mechanism 10 is always kept in a perfect circle state. Therefore, the biased stress does not act on the excavator 40.

  As shown in FIG.1 (c), after constructing a pipe line by a propulsion method to a predetermined distance, it transfers to a shield method. The shield construction method section D after shifting to the shield construction method is constructed in the same manner as the normal shield construction method.

  When shifting to the shield method, the adapter pipe 11, the adjustment pipe 12 and the ruler ring 13 are placed. The connecting pipe 14 may be removed or may be left.

  When removing the connecting pipe 14, the ruler ring 13 functions as a positioning member for the segment 31, as shown in FIGS. 3 (a) and 3 (b). In this case, although not shown in detail, the bolt holes formed in the ruler ring 13 are combined with the bolt holes formed in each segment 31 to fix each segment 31 to the ruler ring 13 by using bolts. The segment tube 30 composed of the segments 31 can be assembled into a perfect circle. When the connecting pipe 14 is removed, the length of the connecting pipe 14 is approximately the same as the length of one segment pipe.

  When the connection pipe 14 is to be placed, as shown in FIG. 1 (d), the shield jack 41 is extended to advance the excavator 40, and then the shield jack 41 is retracted to install the segment pipe 30. Reserve space. And the segment pipe | tube 30 is assembled by arrange | positioning the segment 31 in this space and fixing each segment 31 to the connection pipe | tube 14 with a volt | bolt. At this time, since the outer shape of the front side surface of the connecting tube 14 is a perfect circle, the segment tube 30 can be assembled into a perfect circle. When the connecting pipe 14 is placed, the length of the adjusting pipe 12 is preferably equal to or longer than the length of one segment pipe. This is to prevent deformation by receiving earth pressure from the surroundings when the adjusting pipe 12 is pushed out of the tail seal 42 before the segment 31 is connected. In this case, a ruler ring different from the above may be connected to the front side surface of the connecting pipe 14.

  Thus, when shifting to the shield method, the shape of the ruler ring 13 or the connecting pipe 14 joined to the segment 31 is a perfect circle, so that the segment pipe 30 can be assembled into a perfect circle. In particular, the RC (steel reinforced concrete) segment pipe exhibits the original structural performance in a state of being assembled into a perfect circle, and therefore can be assembled into a perfect circle, which is preferable. However, the segment pipe 30 may be a steel segment pipe, a cast iron (ductile) segment pipe, a synthetic segment pipe, or the like. The adjusting pipe 12 and the connecting pipe 14 may be replaced with a steel segment pipe, a cast iron segment pipe, a synthetic segment pipe, or the like other than the RC segment pipe.

  In addition, when removing the connecting pipe 14, it is preferable not to remove a plurality of pieces constituting the connecting pipe 14 together but to replace the segment 31 for each piece. Specifically, the shield jack 41 that abuts the piece to be removed is shortened, the piece adjacent to this piece, and the bolt that joins this piece to the ruler ring 13 are removed, and the piece is removed. And after removing a piece and installing the segment 31 in the empty space, the corresponding shield jack 41 is extended and the segment 31 is pressed down.

  As mentioned above, although embodiment of this invention was described with reference to drawings, this invention is not limited to this. For example, the case where the outer shapes of the front and rear sides of the adapter pipe 11, the adjustment pipe 12, the ruler ring 13, the connection pipe 14, the propulsion pipe 20 and the segment pipe 30 are circular has been described. However, the outer shape of these front and rear side surfaces may be elliptical. Further, the planar shape of the segment 31 may be a polygonal shape such as a rectangle or a hexagon.

  DESCRIPTION OF SYMBOLS 10 ... Propulsion force transmission mechanism, 11 ... Adapter pipe, 12 ... Adjustment pipe, 13 ... Ruler ring, 14 ... Connection pipe, 15 ... Centering bolt (space | interval adjustment means), 20 ... Propulsion pipe, 30 ... Segment pipe, 31 ... 40, excavator, 41 ... shield jack, 43 ... skin plate, A ... start shaft, B ... reaching shaft, C ... propulsion method section, D ... shield method section.

Claims (6)

In the propulsion method section starting from the starting shaft, a pipeline is constructed using a propulsion pipe by the propulsion method. In the construction method, a propulsive force transmission mechanism for transmitting the propulsive force of the main jack installed in the start shaft to the shield jack inside the excavator,
The outer shape of the rear side substantially matches the outer shape of the front and rear sides of the propulsion tube, the outer shape of the front side substantially matches the outer shape of the front and rear sides of the segment tube, and the front side and the rear side of the propulsion tube located at the front are in contact. An adapter pipe that is in contact with and connected to the propulsion pipe;
The outer shape of the front and rear side surfaces substantially coincides with the outer shape of the front and rear side surfaces of the segment tube, the front side surface and the rear side surface of the adapter tube are in contact with each other and connected to the adapter tube, and can be divided into a plurality of adjustment tubes,
It is formed from a ring-shaped flat plate made of one member, and the outer shape of both front and rear side surfaces substantially coincides with the outer shape of the front and rear side surfaces of the segment tube, and the rear side surface is in contact with the front side surface of the adjusting tube and connected to the adjusting tube. Ruler ring and
The outer shapes of the front and rear side surfaces substantially coincide with the outer shapes of the front and rear side surfaces of the segment tube, the front side surface and the rear side surface of the ruler ring are in contact with each other and connected to the ruler ring, and the rear end portion and the front side surface of the shield jack are A propulsive force transmission mechanism comprising a connecting pipe that abuts and can be divided into a plurality of parts.   The propulsive force transmission mechanism according to claim 1, wherein each piece constituting the adjustment pipe is provided with a gap adjusting means capable of adjusting a gap between the piece and the skin plate of the excavator. In the propulsion method section starting from the starting shaft, a pipeline is constructed using a propulsion pipe by the propulsion method. A construction method,
In the propulsion method section,
The front side of the propulsion tube is located at the front of the rear side of the adapter tube whose outer shape of the rear side substantially matches the outer shape of the front and rear side of the propulsion tube and whose outer shape of the front side substantially matches the outer shape of the front and rear side of the segment tube; Abut the adapter tube and the propulsion tube,
The outer shape of the front and rear side surfaces is substantially the same as the outer shape of the front and rear side surfaces of the segment tube, and the rear surface of the adjustment tube that can be divided into a plurality is brought into contact with the front side surface of the adapter tube, Connect
A ruler ring formed from a ring-shaped flat plate made of a single member and having an outer shape on both front and rear sides substantially matching the outer shape on the front and rear sides of the segment tube is brought into contact with the front side surface of the adjustment tube, thereby Connect the ring and the adjustment pipe,
The outer shape of both front and rear side surfaces substantially coincides with the outer shape of the front and rear side surfaces of the segment tube, and the rear side surface of the connection pipe that can be divided into a plurality is brought into contact with the front side surface of the ruler ring, And connect
And in a state where the rear end portion of the shield jack inside the excavator and the front side surface of the connection pipe are in contact with each other,
Through the propulsive force transmission mechanism consisting of the adapter pipe, the adjustment pipe, the ruler ring and the connection pipe, the propulsive force of the main jack installed in the start shaft is transmitted to the shield jack,
After completing the propulsion method, the connecting pipe is removed,
Connecting a plurality of segments to the front side of the ruler ring to construct the segment tube;
In the shield method section,
While receiving the propulsion reaction force of the shield jack by the leading segment pipe, the shield jack is extended to advance the excavator, and then the shield jack is shortened to the front side of the leading segment pipe. A pipe construction method characterized by connecting a plurality of segments to construct a new segment pipe.   The pipe construction method according to claim 3, wherein a length of the connecting pipe in the front-rear direction is substantially the same as a length of the segment pipe connected to the ruler ring in the front-rear direction. In the propulsion method section starting from the starting shaft, a pipeline is constructed using a propulsion pipe by the propulsion method. A construction method,
In the propulsion method section,
The front side of the propulsion tube is located at the front of the rear side of the adapter tube whose outer shape of the rear side substantially matches the outer shape of the front and rear side of the propulsion tube and whose outer shape of the front side substantially matches the outer shape of the front and rear side of the segment tube; Abut the adapter tube and the propulsion tube,
The outer shape of the front and rear side surfaces is substantially the same as the outer shape of the front and rear side surfaces of the segment tube, and the rear surface of the adjustment tube that can be divided into a plurality is brought into contact with the front side surface of the adapter tube, Connect
A ruler ring formed from a ring-shaped flat plate made of a single member and having an outer shape on both front and rear sides substantially matching the outer shape on the front and rear sides of the segment tube is brought into contact with the front side surface of the adjustment tube, thereby Connect the ring and the adjustment pipe,
The outer shape of both front and rear side surfaces substantially coincides with the outer shape of the front and rear side surfaces of the segment tube, and the rear side surface of the connection pipe that can be divided into a plurality is brought into contact with the front side surface of the ruler ring, And connect
And in a state where the rear end portion of the shield jack inside the excavator and the front side surface of the connection pipe are in contact with each other,
Through the propulsive force transmission mechanism consisting of the adapter pipe, the adjustment pipe, the ruler ring and the connection pipe, the propulsive force of the main jack installed in the start shaft is transmitted to the shield jack,
After completing the propulsion method, while receiving the propulsion reaction force of the shield jack at the leading connecting pipe, extend the shield jack to advance the excavator, and then shorten the shield jack, Connecting a plurality of segments to the front side of the connecting pipe to construct the segment pipe;
In the shield method section,
While receiving the propulsion reaction force of the shield jack at the head segment tube, the shield jack is extended to advance the excavator, and then the shield jack is shortened to the front side of the head segment tube. A pipe construction method characterized by connecting a plurality of segments to construct a new segment pipe.   The pipe construction method according to claim 5, wherein a length of the adjustment pipe in the front-rear direction is longer than a length of the segment pipe connected to the connection pipe in the front-rear direction.

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