JP2004003378A - The propulsion method for shield machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To shorten the length of a shield machine and facilitate the construction of a curved tunneling work by propelling the shield machine in a short elongation of a rod of a propulsive jack and forming a new segment assembling space from the front end face of a tunnel lining, when constructing the tunnel lining while combining a hexagonal segment zig-zag in the peripheral direction of the tunnel on the excavated wall face formed by the shield machine. <P>SOLUTION: At the front end face of a tunnel lining whose front end face is shaped as a trapezoidal uneven end face, by bringing the propelling jack rod of the shield machine into contact with the protruded end face and extending the rod as long as 1/2 of the segment width, a space where the hexagonal segment can be assembled at the front side of the recessed end face of the tunnel lining is formed, and the tunnel lining is constructed by assembling in sequence the new hexagonal segment in the space. <P>COPYRIGHT: (C)2004,JPO

Description

The present invention relates to a propulsion method for a shield excavator that excavates a tunnel while supporting a propulsion reaction force on a tunnel lining constructed by assembling segments on a tunnel excavation wall surface.

Conventionally, a plurality of hexagonal segments are assembled in a tunnel circumferential direction on an excavation wall surface excavated by a shield excavator. When a tunnel lining is constructed, as shown in FIGS. A hexagonal segment 32 is formed by alternately joining and connecting the front and rear inclined end surfaces in a staggered manner, thereby forming a concave portion 34 in which the latter half of the segment can be fitted between the segments 32, 32 in which the first half protrudes in the tunnel length direction. The tunnel lining 30 is constructed while being formed, and the propulsion jack 37 of the shield excavator 40 is mounted on the uneven end surfaces 41 and 42 of the tunnel lining 30 formed by the front end surfaces of the segments 32 connected in a staggered manner in the circumferential direction. The tunnel is dug by extending it in contact.

Then, when the propulsion jack 37 is extended to make the excavation length of the shield excavator 40 equal to half the width of the hexagonal segment 32 in the tunnel length direction, the protruding jack 37 moves forward from the concave end surface 42 of the tunnel lining 30. Since the space 4A in which the front half of the hexagonal segment 32 can be disposed is formed, the shield excavator 40 is temporarily stopped, and then the hexagonal segment 32, 32 in which the front half protrudes in the tunnel length direction. The new hexagonal segment 32 is fitted with the rear half of the new hexagonal segment 32 and the front half of the new hexagonal segment 32 projects forward from the convex end face 41 of the tunnel lining 30 as shown by a dashed line. .
JP-A-3-132600

However, according to the shield excavator propulsion method described above, the shield excavator is extended by extending the rod end of the propulsion jack 37 in contact with the concave end surface 42 as well as the convex end surface 41 of the tunnel lining 30. When the shield excavator 40 is temporarily stopped and the latter half of the new segment 32 is installed in the predetermined concave portion 34, the space width in the tunnel length direction for the installation is obtained because the shield excavator 40 is temporarily stopped. The length of the extension jack 37a must be greater than the width L between the front and rear ends of the segment 32 in the tunnel length direction. The length of the skin plate 40a of the shield excavator 40 in which the propulsion jack 37 is mounted on the inner peripheral surface is inevitably increased, which not only increases the cost but also increases the length of the skin plate 40a. Direction controllability is deteriorated and, moreover, the starting pit must also be increased, there is a problem that it is uneconomical.

Also, in order to improve the construction efficiency of the tunnel, a method of incorporating a new segment 32 into a desired concave portion 34 in the concave and convex end surfaces 41, 42 of the tunnel lining 30 while excavating the shield excavator 40 without stopping it. In the above, if the propulsion jack 37 is propelled while supporting the propulsion reaction force of the propulsion jack 37 also on the concave end surface 42 of the tunnel lining 30 as described above, it becomes possible to incorporate a new segment into the front end surface of the tunnel lining 30 In order to excavate the tunnel until space is obtained, it is necessary to extend the rod 37a of the propulsion jack 37 abutting on the concave end surface 42 of the tunnel lining 30 as described above, and to extend it beyond the segment width. During the work of incorporating the new segment 32 into the recess 34, the propulsion of the shield excavator 40 is performed by extending the rod 37a of the propulsion jack 37 by a length corresponding to a half of the segment width. In order to continue the operation, the propulsion jack 37 having at least the expansion and contraction length of the rod 37a, that is, the effective working length of 1.5 times or more the segment width must be used.

Accordingly, not only is the skin plate 40a of the shield excavator 40 equipped with these propulsion jacks 37 long, which makes it difficult to construct a curved tunnel, but also causes the same problems as described above in terms of economy and the like. .

The present invention has been made in view of such a problem, and an object of the present invention is to provide a space in which a new segment can be incorporated into the front end surface of a tunnel lining despite the short effective working length of a propulsion jack. An object of the present invention is to provide a method of propelling a shield excavator capable of forming a part.

In order to achieve the above object, a method for propelling a shield excavator according to claim 1 of the present invention forms a recess in which a rear half of a segment can be fitted between segments whose front half protrudes in a tunnel length direction. A plurality of segments are connected in a staggered manner in the circumferential direction of the tunnel to construct a tunnel lining in which the front end face is formed on the uneven end face, and a skin plate of a shield excavator is provided on the front end face of the tunnel lining. In the propulsion method for propelling the shield excavator by supporting the propulsion reaction force of the propulsion jack mounted on the inner peripheral surface of the propulsion jack, the length of the cylinder portion of all the propulsion jacks is oriented in the tunnel length direction. The propulsion jacks are formed to have a length of 1/2 to 1 times the width between the front and rear end faces of the propulsion jacks provided in correspondence with the respective segments on which the uneven end faces of the tunnel lining are formed. The propulsion jack excavator is propelled by extending only the rod of the propulsion jack facing the convex end surface by contacting the front end surface of the segment forming the convex end surface.

In the propulsion method for a shield excavator according to the first aspect, the invention according to the second aspect includes, after excavating a tunnel of a predetermined length, temporarily stopping the shield excavator and incorporating a segment into a recess of the tunnel lining. Later, the shield excavator is propelled.

As described above, according to the propulsion method of the shield excavator of the present invention, a plurality of segments are formed while forming a recess in which the rear half of the segment can be fitted between the segments whose front half protrudes in the tunnel length direction. The tunnel excavator was constructed in a staggered fashion in the circumferential direction of the tunnel, with the front end face formed on the uneven end face. In the propulsion method for propelling, the lengths of the cylinder portions of all the propulsion jacks are formed to be 1/2 to 1 times the width between the front and rear end faces of the segment oriented in the tunnel length direction. Of the propulsion jacks provided corresponding to each segment having the uneven end surface of the tunnel lining, only the rod of the propulsion jack facing the convex end surface is the front end of the segment forming the convex end surface. Since the shield excavator is propelled by abutting against the surface and extending, the length of the propulsion jack rod, which is in contact with the convex end surface of the segment lining, corresponds to half the segment width. Just by extending it, it is possible to form a space in which the segment can be incorporated in front of the concave end surface of the tunnel lining. The skin plate length of the mounted shield excavator can be shortened and the cross section space of the starting shaft can be reduced, which is not only economical, but also improves the direction controllability of the shield excavator. The construction of a curved tunnel can be performed smoothly.

施工 Tunnel lining is performed by connecting multiple segments in the circumferential direction on the excavated wall surface excavated by the shield excavator. At this time, the previously constructed segment and the next constructed segment are assembled so that half of the width in the tunnel length direction is alternately shifted in the front-rear direction. When a plurality of segments are assembled in a ring shape in the circumferential direction of the tunnel in this way, a concave portion is formed between the segments whose front half protrudes forward so that the latter half of the segment can be fitted. The front end face of the segment assembled between the segments whose parts project forward is exposed. Therefore, a tunnel lining is formed in which the front end face of the segment whose front half protrudes forward is a convex end face, and the front end face of the segment exposed in the concave portion is a concave end face. On the other hand, the shield excavator is provided with a plurality of propulsion jacks respectively corresponding to a plurality of segments forming a tunnel lining for one ring.

To extrude the shield excavator by the propulsion jack, of the segments forming the uneven end face of the tunnel lining, the propulsion jack rod corresponding to the concave end face is kept in a contracted state, while the convex end face is The propulsion jack rod corresponding to the front end face of the segment being formed is brought into contact with the convex end face to support the propulsion reaction force of the shield excavator, and the shield excavator is extended by extending the rods of the propulsion jack. Excavate. When the excavation length reaches the width between the front and rear end surfaces of the segment, that is, a length corresponding to half of the segment width, a space is formed in front of the concave end surface of the tunnel lining where the segment can be incorporated. . In other words, when the rod of the propulsion jack extends from the state where the rod of the propulsion jack is in contact with the convex end face of the segment lining as described above to a length corresponding to a half of the segment width, the space in which the segment can be assembled is formed. Will be formed.

As described above, in order to allow the shield excavator to excavate and obtain a space in which the segment can be easily incorporated in front of the concave end surface of the tunnel lining, the rod of the propulsion jack is required to have a length of at least 1/2 of the segment width. It is only necessary to extend the length corresponding to the following, so that the length of the cylinder part of the propulsion jack can be reduced, and the length of the skin plate of the shield excavator equipped with these propulsion jacks can be reduced. It can be formed.

By excavating the shield excavator until the space where the segment can be assembled is obtained in front of the concave end surface of the tunnel lining, temporarily stopping and incorporating the segment into the space, and then propelling the shield excavator Tunnel lining can be built.

In this way, tunnel lining can be performed with a propulsion jack whose length is at least half the segment width as compared to the propulsion jack of a conventional shield excavator, and therefore, the total length of the skin plate of the shield excavator can be shortened. The direction controllability is good, and the construction of a curved tunnel can be easily performed.

Next, a specific embodiment of the present invention will be described with reference to the drawings. A tunnel T is excavated by a shield excavator 1 and a plurality of hexagonal segments 2 are circumferentially joined and connected along the tunnel excavation wall surface t. Then, the tunnel lining 3 is formed. The hexagonal segment 2 is made of reinforced concrete or steel and is formed in a well-known plane hexagonal shape curved in the tunnel circumferential direction, and its outer peripheral surface is parallel to the tunnel circumferential direction as shown in FIG. Front and rear end faces 21, 22 having the same length, and front and rear inclined end faces 23, 24, 25, 26 which are V-shaped are provided between both ends of the front and rear end faces 21, 22 opposed in the tunnel length direction, respectively. It is formed in a shape consisting of

The hexagonal segment 2 thus formed is assembled on the tunnel excavation wall surface t excavated by the shield excavator 1. To construct the tunnel lining 3, in any hexagonal segment 2, the front side of the arbitrary hexagonal segment 2 is formed. One of the rear inclined end surfaces 24, 26 on the rear side of the hexagonal segments 2, 2 adjacent to the hexagonal segment 2 in the tunnel circumferential direction is joined to the inclined end surfaces 23, 25, respectively, in a state where they are joined to each other. The hexagonal segments 2 and 2 are assembled such that the other rear inclined end surfaces 24 and 26 are joined to one of the front inclined end surfaces 23 and 25 of the next hexagonal segment 2. That is, the tunnel lining 3 is constructed such that the hexagonal segments 2 are alternately shifted in the front-rear direction by half of the width in the length direction of the tunnel and are combined in a staggered manner in the circumferential direction of the tunnel.

Therefore, in the tunnel lining 3 for one ring assembled in the tunnel circumferential direction, the trapezoidal front half of every other hexagonal segment 2 protrudes forward (in the tunnel length direction) in the tunnel circumferential direction. The trapezoidal recess 4 into which the trapezoidal rear half of the new hexagonal segment 2 can be fitted is formed between the facing front inclined end surfaces 23 and 25 of the hexagonal segments 2 and 2. Further, the front end face of the tunnel lining 3 is formed such that the front end face 21 of the hexagonal segment 2 whose front half protrudes is a convex end face 3a and the front end face of the hexagonal segment 2 exposed in the trapezoidal concave portion 4 is provided. The surface 21 is a concave end surface 3b, and these uneven end surfaces 3a and 3b are formed in a staggered shape in the tunnel circumferential direction.

As shown in FIG. 1, the shield excavator 1 divides a cylindrical skin plate as a main body into a front body 11 and a rear body 12, and arranges a cutter plate 13 at a front end opening of the front body 11. A rotation center shaft 14 of the cutter plate 13 is rotatably supported by a partition 18 provided integrally with the front end of the front body 11, and the cutter plate 13 is driven by a drive motor 15 disposed on the back of the partition 18. Is configured to be rotationally driven. Further, a plurality of inner peripheral surfaces at the opposite end portions of the front trunk 11 and the rear trunk 12, for example, between the upper, lower, left and right sides, are connected by a center bending jack 16, and the inner peripheral surface of the rear trunk 12 is circumferentially connected. A plurality of (three in the figure) propulsion jacks 17 are mounted on the ribs 19 provided in the directions, corresponding to the front end faces of the hexagonal segments 2 assembled in the tunnel circumferential direction, respectively.

The length of the cylinder portion 17a of all of the propulsion jacks 17 is 1/2 to 1 times the width (segment width) between the front and rear end faces 21 and 22 of the hexagonal segment 2 oriented in the tunnel length direction. Formed. Therefore, the extension length of the rod 17b of the propulsion jack 17 which extends and contracts rearward, that is, the effective working length is also set to be 1/2 to 1 times the segment width L. Reference numeral 5 denotes a segment assembly provided in the rear portion of the rear trunk 12 on the rear side of the propulsion jack 17. Although not shown, a means for discharging earth and sand excavated by the cutter plate 13 is also provided.

A method of constructing the tunnel lining 3 by excavating the tunnel T by the shield excavator 1 and sequentially assembling the hexagonal segments 2 on the tunnel excavation wall surface t will be described. FIG. 3 shows a tunnel already constructed. FIG. 4 is a development view showing a state in which the rod 17b of the propulsion jack 17 is brought into contact with the convex end surface of the lining 3. FIG. 4 shows a state in which the rod 17b of the propulsion jack 17 is extended from the state shown in FIG. 1 shows a state in which a space portion 4A in which a new hexagonal segment 2 can be incorporated is provided in front of the concave end surface 3b on the front end surface of the tunnel lining 3 by excavating the tunnel end. In the drawing, the tunnel lining for one ring which goes around the tunnel excavation wall surface t is formed by eight hexagonal segments 2, but is formed by four or more even hexagonal segments 2. It is good.

In order to propel the shield excavator 1 to the position where the space portion 4A where the next hexagonal segment 2 can be assembled is formed in front of the concave end face 3b of the tunnel lining 3, first, From the state in which the rods 17b of the propulsion jacks 17 provided to correspond to the concave and convex end faces 3a and 3b are contracted, the rod 17b of the propulsion jack 17 facing the convex end face 3a is slightly extended, as shown in FIG. As described above, the hexagonal segment 2 forming the convex end surface 3a is brought into contact with the front end surface 21. In this state, between the concave end surface 3b of the tunnel lining 3 and the rod 17b of the propulsion jack 17 facing the concave end surface 3b, a concave portion 4 having a space width substantially equivalent to a half width of the hexagonal segment 2 is provided. Is provided.

From this state, the shield excavator 1 is propelled by extending the rod 17b of the propulsion jack 17 which is in contact with the convex end face 3a of the tunnel lining 3, and the amount of extension of the rod 17b, that is, the effective working length is equal to the segment width L. When the length corresponding to 1/2 is reached, the concave portion 4 in front of the concave end face 3b of the tunnel lining 3 further expands in the tunnel length direction by the amount of extension of the rod 17b, and as shown in FIG. A space portion 4A into which the hexagonal segment 2 can be incorporated is obtained.

In order to incorporate the hexagonal segment 2 into the space 4A with sufficient workability with a margin, the width of the space 4A in the tunnel length direction needs to be somewhat larger than the width L of the hexagonal segment 2. Accordingly, the extension amount of the rod 17b of the propulsion jack 17 to be brought into contact with the convex end face 3a of the tunnel lining 3 corresponds to 1/2 to 1 width of the hexagonal segment 2 from the state where the rod 17b is completely contracted. The length of the cylinder portion 17a of the propulsion jack 17 for accommodating the rod 17b is also formed to a length corresponding to the width within the range.

As described above, the shield excavator 1 is excavated until a space portion 4A in which the hexagonal segment 2 can be incorporated is obtained in front of each concave end surface 3a of the tunnel lining 3, and then the excavator 1 is temporarily stopped. As shown in the figure, when the hexagonal segments 2 are incorporated into each space portion 4A, the front half of these newly incorporated hexagonal segments 2 (only one is shown in the figure) projects forward, The protruding front end face 21 becomes the protruding end face 3a of the tunnel lining 3, and the rod 17b of the propulsion jack 17 corresponding to the protruding end face 3a is brought into contact with the protruding end face 3a. / 2 to form a space 4A in which the next hexagonal segment 2 can be installed between the newly installed hexagonal segments 2 after being extended by a length corresponding to 1 and stop the shield excavator 1 Hex in space 4A The segments 2 embedded, is intended for connecting the opposed joint surfaces of a hexagonal segment 2 already assembled by bolts and nuts or the like, is intended to continue to construction of the tunnel lining 3 by repeating this operation.

In the method described above, the tunnel lining 3 is constructed by the hexagonal segments 2, but may be constructed by a planar rectangular segment curved in the circumferential direction of the tunnel. Even in the case of constructing a tunnel lining with this planar rectangular segment, a plurality of segments are formed while forming a space in which the latter half of the segment can be fitted between the segments whose front half protrudes in the tunnel length direction. Are connected in a staggered manner in the circumferential direction of the tunnel to construct a tunnel lining in which the front end surface is formed in an uneven surface.

Simplified longitudinal side view of shield excavator under construction of tunnel lining, Partial simplified perspective view showing the construction state of the tunnel lining, A development view showing a state in which the rod of the propulsion jack is contracted and brought into contact with the convex end surface of the tunnel lining, Exploded view of a state where a shield excavator is excavated to provide a space where a new hexagonal segment can be incorporated, Simplified longitudinal side view of a shield excavator for constructing a conventional tunnel lining, Development view of the tunnel lining.

Explanation of reference numerals

DESCRIPTION OF SYMBOLS 1 Shield excavator 2 Hexagonal segment 3 Tunnel lining 3a, 3b Irregular end face 4 Recess 4A space 12 Rear body of skin plate 17 Propulsion jack 17b Rod

Claims (2)

A plurality of segments are connected in a staggered manner in the tunnel circumferential direction while forming a recess in which the second half of the segment can be fitted between segments with the first half protruding in the tunnel length direction and the front end surface is formed as an uneven end surface The tunnel excavator is constructed and the front end face of the tunnel excavator is supported by the propulsion reaction force of the propulsion jack mounted on the inner peripheral surface of the skin plate of the shield excavator to propel the shield excavator. In the above propulsion method, the length of the cylinder portion of all the propulsion jacks is formed to be 1/2 to 1 times the width between the front and rear end faces of the segment oriented in the length direction of the tunnel. Of the propulsion jacks provided corresponding to each segment having the rugged end surface of the lining, only the rod of the propulsion jack facing the convex end surface is placed in front of the segment forming the convex end surface. A propulsion method for a shield excavator, wherein the propulsion of the shield excavator is performed by abutting an end face to extend the propulsion. The shield excavator according to claim 1, wherein after the tunnel excavation of a predetermined length, the shield excavator is temporarily stopped to incorporate a segment into the recess of the tunnel lining, and then the shield excavator is propelled. Promotion method.

Images