JP5363908B2 - Large-diameter shield machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a large bore shield machine capable of preventing its cost from increasing, increasing its thrust, and preventing its backing even when excavating the ground by large depth. <P>SOLUTION: This large bore shield machine 1 includes a cutter device 3 for excavating working face natural ground in a front part in a cylindrical shield frame 2, a segment assembling device 5 for assembling a segment 4 along an internal wall of a tunnel in a rear part in the shield frame 2, and a shield jack 6 pressing an end face of the assembled segment 4 to let the shield frame 2 advance. The shield jack 6 includes outer jacks 6a arranged in parallel in the peripheral direction on an outward side in the radial direction in the shield frame 2 and inner jacks 6b arranged in parallel in the peripheral direction on an inward side in the radial direction more than the outer jacks 6a. A plurality of adjacent outer jacks 6a and a plurality of inner jacks 6b being the smaller number than that of the outer jacks are grouped, respectively, and are connected with spreader shoes 29 in common use. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a large-diameter shield machine with improved thrust.

  The shield machine is assembled with a segment assembling device for assembling a segment along the inner wall of the tunnel at the rear of the shield frame, with a cutter device for excavating the face mountain at the front of the cylindrical shield frame. And a shield jack that pushes the end face of the segment and advances the shield frame (see, for example, Patent Document 1).

  By the way, when constructing a tunnel having a large cross section, it is preferable to use a shield tunneling machine having a large diameter. In that case, in order to improve the thrust, for example, as shown in FIG. 7, it is conceivable to arrange a plurality of shield jacks 6 side by side on the inner periphery of the shield frame 2 having a large diameter.

JP 2005-146762 A

  However, in a large-diameter shield machine, a relatively large earth pressure is applied to the front cutter device, especially when excavating deep formations. There is a limit to improvement, and there is a risk that the shield machine will cause a back-up (backing). In order to improve the thrust, it is conceivable to employ a high-power shield jack, but in this case, there is a problem that the cost is significantly increased.

  The present invention has been made in consideration of the above circumstances, a large-diameter shield machine that can improve thrust while suppressing an increase in cost, and can prevent reversal even when constructing a large depth. The purpose is to provide.

  In order to achieve the above object, the present invention provides a cutter device for excavating a face mountain in the front part of a cylindrical shield frame, and assembles a segment along the inner wall of the tunnel in the rear part of the shield frame. A large-diameter shield machine provided with a segment assembling apparatus and a shield jack for advancing the shield frame by pressing an end face of the assembled segment, the shield jack being radially outward in the shield frame An outer jack arranged side by side in the circumferential direction and an inner jack arranged side by side in the circumferential direction on the radially inner side of the outer jack, and a plurality of adjacent outer jacks and the outer jack Fewer inner jacks than jacks, grouped together and connected to a common spreader shoe That.

  It is preferable that the outer jack and the inner jack are respectively connected to the spreader shoe via an eccentric metal piece, so that the center of the spreader shoe is set as the pushing center.

  The shield frame is divided into a front body portion and a rear body portion, and bent jacks that connect the front body portion and the rear body portion so as to be bendable are disposed at appropriate intervals in the circumferential direction. It is preferable that the jacks and the inner jacks are arranged in a staggered manner in the circumferential direction, and the folded jack is arranged in a gap portion between adjacent inner jacks.

  According to the present invention, an increase in cost can be suppressed and thrust can be improved, and backtracking can be prevented even when constructing a large depth.

1 is a longitudinal sectional view of a large-diameter shield machine according to an embodiment of the present invention. It is a figure which shows roughly the example of arrangement | positioning of a shield jack when seeing the same large-diameter shield machine from back. FIG. 3 is an enlarged view of a main part of FIG. 2. FIG. 4 is a sectional view taken along line AA in FIG. 3. It is an enlarged view which shows the other example of arrangement | positioning of a seal jack. It is a graph which shows the relationship between the thrust of a shield jack, and the aperture of a shield frame. It is a figure which shows roughly the example of arrangement | positioning of the shield jack assumed by a large caliber shield machine.

  EMBODIMENT OF THE INVENTION Below, the form for implementing this invention is explained in full detail based on an accompanying drawing.

  As shown in FIGS. 1 and 2, the large-diameter shield machine 1 of the present embodiment is provided with a cutter device 3 for excavating a face mountain in the front part of a cylindrical (for example, cylindrical) shield frame 2. A segment assembling apparatus 5 for assembling the segment 4 along the inner wall of the tunnel, and a shield jack 6 for pressing the end face of the assembled segment 4 to advance the shield frame 2 at the rear of the shield frame 2; It is configured.

  The shield frame 2 is divided into a front body portion 2a and a rear body portion 2b. Jacks 7 are arranged at appropriate intervals in the circumferential direction. In this case, the cutter device 3 is provided in the front barrel portion 2a, and the segment assembling device 5 is provided in the rear barrel portion 2b. The rear body portion 2b is provided with a shape holding device 8 that holds the shape of the segment 4 by pressing the inner peripheral upper and lower surfaces of the segment 4 assembled in a ring shape. A backfilling material injection device 9 for injecting the backfilling material is provided between the outer periphery and the inner wall surface of the natural ground of the tunnel. The segment assembling apparatus 5 and the shape maintaining apparatus 8 are well-known ones, and will not be described here.

  The front trunk portion 2a is provided with a partition wall 10 that divides the interior into the front and the back. The partition wall 10 is composed of an annular outer peripheral partition wall 11 and an inner central partition wall 12. The outer peripheral partition wall 11 includes a front partition wall 11a and a rear partition wall 11b disposed at a front and rear with a predetermined interval, and a cylindrical inner peripheral wall 11c interposed between the front partition wall 11a and the rear partition wall 11b. ing.

  The cutter device 3 includes a cutter pork 16 provided radially between the central shaft 13 and the intermediate ring 14 and between the intermediate ring 14 and the outer peripheral ring 15, and a cutter bit 17 attached to the cutter pork 16. ing. The cutter device 3 has a swivel ring 19 coupled via a support beam 18 extending rearward from the intermediate ring 14, and the swivel ring 19 is supported by the partition wall 10 through a bearing 20.

  The bearing 20 includes a fixed-side bearing member 20a provided on the partition wall 10 and a rotation-side bearing member 20b provided on the swivel ring 19. An external gear 21 is provided on the outer periphery of the rotation-side bearing member 20b. Is provided. The partition wall 10 is provided with a drive motor 22 having a pinion 22 a that meshes with the external gear 21.

  A copy cutter 23 for excavating (over-excavating) natural ground projecting outward from the outer peripheral ring 15 into the cutter device 3, and for injecting a chemical solution (for example, a mud-forming agent) toward the face of the face. Various devices such as a chemical injection nozzle (not shown), an ultrasonic ground exploration device, and an electric wear detection bit are provided.

  A base end portion of the central shaft 13 is rotatably supported by the central partition wall 12 through a bearing 24. At the rear end portion of the central shaft 13, a rotary joint 25 is provided for supplying hydraulic pressure, medicine, and electricity from the fixed side to various devices provided in the cutter device 3 through the inside of the central shaft 13. .

  A cutter chamber 26 is formed between the cutter device 3 and the partition wall 10 to take in excavated earth and sand. The cutter device 3 and the partition wall 10 have stirring blades 27a for agitating the excavated earth and sand taken into the cutter chamber 26. 27b is disposed as appropriate. A screw conveyor 28 for carrying the excavated earth and sand in the cutter chamber 26 to the rear in the shield frame 2 is provided below the partition wall 10 so as to obliquely penetrate the outer peripheral partition wall 11.

  The shield jack 6 is arranged in an outer jack 6a arranged in the circumferential direction on the radially outer side in the shield frame, and arranged in a circumferential direction on the radially inner side than the outer jack 6a. A plurality of adjacent (three in the illustrated example of FIG. 3) outer jacks 6a and a smaller number (two) of inner jacks 6b than the outer jacks 6a are grouped. Are connected to a common spreader shoe 29.

  As the outer jack 6a and the inner jack 6b, general ones having an output of, for example, 2140 kN (250 t) are used. When the inner diameter of the shield frame 2 is 16 m, for example, 30 sets of the inner and outer jacks 6a and 6b, ie, 150 sets in total, are used.

  A ring girder 30 is provided on the inner periphery of the rear body 2b of the shield frame 2, and an outer jack 6a and an inner jack 6b are attached to the ring girder 30 by bolting via mounting flanges 31a and 31b, respectively. In this case, the attachment flanges 31a and 31b are quadrangular (square), but are attached to the outer jack 6a and the inner jack 6b in a diamond shape rotated 90 degrees as shown in FIG. As a result, the mounting flange 31b of the inner jack 6b is in the engaged state between the mounting flanges 31a, 31a of the adjacent outer jack 6a, and the outer jack 6a and the inner jack 6b are staggered in the circumferential direction. . In this case, in one group, the outer jack 6a and the inner jack 6b are arranged in a W shape (inverse W shape or M shape in FIG. 3).

  Further, the outer jack 6a and the inner jack 6b are connected to the spreader shoe 29 via eccentric metal pieces 32a and 32b, respectively, so that the center of the spreader shoe 29 (the graphic core viewed from the front) is the pressing center 33. It is set to be. In that case, for example, only the eccentric hardware 32 a of the center outer jack 6 a is fixed to the spreader shoe 29, and the eccentric hardware 32 a and 32 b of the other four inner and outer jacks 6 a and 6 b are simply brought into contact with the spreader shoe 29. It is preferable to prevent damage due to interference between jacks. Note that the rotation of the spreader shoe 29 is restricted by the inner peripheral surface of the rear body portion 2b.

  The folded jack 7 is disposed at a position where it does not interfere with the outer jack 6a and the inner jack 6b. In this case, the folded jack 7 is disposed in the gap portion 34 between the inner jacks 6b, 6b of adjacent groups. (See FIGS. 2 and 3).

  The operation of the present embodiment having the above configuration will be described. According to this embodiment, the shield jack 6 includes an outer jack 6a arranged in the circumferential direction on the radially outer side in the shield frame 2, and a radially inner side of the outer jack 6a. And a plurality of adjacent outer jacks 6a and a smaller number of inner jacks 6b than the outer jacks 6a are grouped and connected to a common spreader shoe 29. Therefore, an expensive large output shield jack is not required, the cost can be increased and thrust can be improved, and even when constructing a large diameter tunnel at a large depth, a large diameter shield machine with earth pressure It is possible to prevent the backtracking of 1.

  Further, since the outer jack 6a and the inner jack 6b are connected to the spreader shoe 29 via the eccentric metal pieces 32a and 32b, respectively, the center of the spreader shoe 29 is set as the push center 33, so that a plurality of jacks are provided. Can output a large thrust.

  The shield frame 2 is divided into a front body portion 2a and a rear body portion 2b, and bent jacks 7 that connect the front body portion 2a and the rear body portion 2b in a bendable manner are disposed at appropriate intervals in the circumferential direction. In addition, the outer jack 6a and the inner jack 6b are arranged in a staggered manner in the circumferential direction, and the middle jack 7 is arranged in the gap 34 between the adjacent inner jacks 6b and 6b. The folded jack 7 can be easily disposed at a suitable position without interfering with the plurality of outer jacks 6a and the inner jacks 6b.

We examined whether there was a diameter of the shield frame that could not follow the thrust of the shield jack. Regarding the relationship between the diameter D and the thrust, the thrust per unit area is proportional to D ² , and the number of shield jacks that can be equipped with thrust is proportional to D. Although there is a difference in the selection of the thrust per shield jack depending on the diameter D of the shield machine, the relationship between the diameter and the thrust per unit area in consideration of the mounting space between jacks is shown in the graph of FIG. become that way. Although it is impossible to make a general determination based on the civil engineering conditions (water pressure, earth pressure) and the girder thickness of the segment, it is considered possible from the graph of FIG. Also, if the diameter is large (extra large diameter), the girder thickness of the segment also increases, so it becomes possible to arrange the shield jacks in a staggered manner, and it is possible to equip with the same thrust as those with a diameter D of 10 m to 20 m. Become.

  The embodiments of the present invention have been described in detail with reference to the drawings. However, the present invention is not limited to the above-described embodiments, and various design changes can be made without departing from the gist of the present invention. . FIG. 5 is an enlarged view showing another arrangement example of the seal jack. In this embodiment, one inner jack 6b is arranged with respect to two adjacent outer jacks 6a, 6a, thereby providing an outer jack. 6a and the inner jack 6b are arranged in a V shape (inverted V shape). In addition, the bent jack 7 is disposed in the gap 34 between the adjacent inner jacks 6b, 6b.

DESCRIPTION OF SYMBOLS 1 Large-diameter shield machine 2 Shield frame 3 Cutter device 4 Segment 5 Segment assembly device 6 Shield jack 7 Folding jack 29 Spreader shoes 32a and 32b Eccentric hardware 33 Push center 34 Gap

Claims (3)

  A cutter device for excavating a face mountain is provided at the front of the cylindrical shield frame, and a segment assembly device for assembling the segment along the inner wall of the tunnel at the rear of the shield frame, and an end face of the assembled segment. A large-diameter shield excavator provided with a shield jack that pushes forward to advance the shield frame, the shield jack being an outer jack arranged in the circumferential direction on the radially outer side in the shield frame A plurality of adjacent outer jacks and a smaller number of inner jacks than the outer jacks, and an inner jack arranged in a circumferential direction on the radially inner side of the outer jack. Large diameter shield machine characterized in that it is connected to a common spreader shoe.   2. The large-diameter shield machine according to claim 1, wherein the outer jack and the inner jack are respectively connected to the spreader shoe via eccentric hardware, so that the center of the spreader shoe is set as a push center. .   The shield frame is divided into a front body portion and a rear body portion, and bent jacks that connect the front body portion and the rear body portion so as to be bendable are disposed at appropriate intervals in the circumferential direction. The large-diameter shield drill according to claim 1 or 2, wherein the jack and the inner jack are arranged in a staggered manner in the circumferential direction, and the bent jack is arranged in a gap portion between adjacent inner jacks. Machine.

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