JP4541266B2 - Tunnel excavator - Google Patents

Description

  The present invention relates to a tunnel excavator having a widening function for partially widening a tunnel.

  Conventionally, when building a road tunnel with the shield method, when partially expanding an emergency parking zone or branching junction, etc., a shield excavator with a widening function such as a method of manually cutting and expanding the ground from the pit and a copy cutter, etc. The construction method using was adopted.

  Also, in recent years, there is a construction method that wraps a part of the outer cylinder part of the shield machine and expands / contracts the excavation section continuously (both machine and segment) by expanding and contracting this lap part during excavation. This is disclosed in Patent Document 1 and the like.

  And in the said patent document 1, in the outer shell inner surface arrange | positioned inside among the outer shells mutually superposed | polymerized, the belt-shaped 1st tail seal brush installed in the front-back direction several steps, and the outer side among the outer shells superposed on each other An inner surface of the outer shell and a second tail are provided on the inner surface of the outer shell, the inner surface of the outer shell being disposed on the outer side, and the second tail seal brush in a strip shape disposed in a plurality of stages at a slidable position. Providing a gap where the end of the outer shell arranged inside can be inserted between the seal brush installation part and a water stop plate for closing the gap provided in the outer shell arranged inside to lengthen the captain. There is disclosed a tail seal device that can perform tail seal in multiple stages.

Japanese Patent Laid-Open No. 11-13391

  However, in the tail seal device disclosed in Patent Document 1, since the first tail seal brush and the second tail seal brush simply slide relative to each other, the first tail seal brush and the second tail seal brush It is difficult to maintain good adhesion with the tail seal brush over a long period of time, and the tip of the brush comes into sliding contact with the outer surface of the segment only with its own crimping force. There is a concern that a sufficient sealing action cannot be obtained.

  In the present invention, tail seal brushes can be arranged in multiple stages to cope with high water pressure stop water, while an air tube is arranged in the sliding part of the tail seal brush to improve the adhesion of the sliding part. An object of the present invention is to provide a tunnel excavator equipped with a tail seal device that can obtain a satisfactory sealing performance.

In order to achieve such an object, a tunnel excavator according to the present invention includes:
Excavator main body in which a part of the movable outer shell is superposed on the fixed outer shell so as to be slidable in the tunnel diameter increasing direction, a widening jack for sliding the movable outer shell, and a propulsion for moving the excavator main body forward A jack, a cutter head rotatably supported at a front portion of the excavator body, a driving means for rotationally driving the cutter head, and a brush tip mounted on a rear end portion of the fixed outer shell and the movable outer shell; A tunnel excavator comprising: a main line segment corresponding to a fixed outer shell; and a tail seal device in sliding contact with an outer surface of a widened segment corresponding to a movable outer shell.
The tail seal device includes a belt-shaped first tail seal brush installed on the inner surface of the fixed outer shell in a plurality of stages in the front-rear direction, and the first tail seal brush is slidable on the inner surface of the movable outer shell. together and a second tail seal brush strip placed over a plurality of stages to Do position, the mounting portion of the first tail seal brushes and second tail seal brushes, the first and second tail seal brushes A first air tube for urging the brush tip toward the outer surface side of the main line segment and the widened segment and a second air tube for improving the adhesion between the first and second tail seal brushes are provided.

Also,
Excavator main body in which a part of the movable outer shell is superposed on the fixed outer shell so as to be slidable in the tunnel diameter increasing direction, a widening jack for sliding the movable outer shell, and a propulsion for moving the excavator main body forward A jack, a cutter head rotatably supported at a front portion of the excavator body, a driving means for rotationally driving the cutter head, and a brush tip mounted on a rear end portion of the fixed outer shell and the movable outer shell; A tunnel excavator comprising: a main line segment corresponding to a fixed outer shell; and a tail seal device in sliding contact with an outer surface of a widened segment corresponding to a movable outer shell.
The tail seal device includes a belt-shaped first tail seal brush installed on the inner surface of the fixed outer shell in a plurality of stages in the front-rear direction, and the first tail seal brush is slidable on the inner surface of the movable outer shell. And a belt-like second tail seal brush installed in a plurality of stages at different positions, and the brushes of the first and second tail seal brushes at the attachment portions of the first tail seal brush and the second tail seal brush A first air tube for urging the tip toward the outer surface side of the main line segment and the widening segment is provided, and the first tail seal brush and the second tail seal brush are attached vertically and horizontally at the attachment portion; Between the first and second tail seal brushes, a vertically oriented one and a horizontally oriented one form a pair and are in sliding contact.

  According to the tunnel excavator of the present invention, the first and second tail seal brushes can sufficiently cope with the high water pressure stop water due to the multistage arrangement, while the first and second urging forces cause the first and second Adhesion with the outer surface of the main line segment and the widened segment of the tail seal brush is enhanced, and sufficient sealing performance is obtained.

  In addition, due to the urging force of the second air tube, the adhesion between the first and second tail seal brushes is enhanced, and the sealing performance is further enhanced. Also, since the first and second tail seal brushes are in sliding contact with each other in the vertical direction and in the horizontal direction, the first tail seal brush and the second tail seal brush are assembled so-called back to back. The mutual adhesion is enhanced, and the sealing performance is further enhanced.

  Hereinafter, a tunnel excavator according to the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 is a diagram showing the arrangement of brushes in different working states of a tail seal device according to an embodiment of the present invention, FIG. 2 is a cross-sectional view taken along line AA in FIG. 1B, and FIG. 3 is B in FIG. 4 is a cross-sectional view taken along the line CC of FIG. 1B, FIG. 5 is a cross-sectional view taken along the line EE of FIG. 3 in a different operating state, and FIG. FIG. 7 is a sectional side view of the muddy water type shield excavator, and FIG. 8 is a sectional view taken along the lines GG and HH of FIG.

  The tunnel excavator described in the present embodiment supplies mud into the face and the chamber, and discharges excavated soil together with mud while facing the earth pressure and the water pressure with the mud pressure while stabilizing the face. It is a muddy water type shield excavator that constructs a tunnel.

  In this muddy water type shield excavator, as shown in FIGS. 7 and 8, the excavator body 1 is composed of a fixed outer shell 2 provided on the upper and lower sides and a part of the fixed outer shell 2 to overlap the tunnel outer diameter direction. And a pair of left and right semicircular movable outer shells 3 slidable in a cylindrical shape. The movable outer shell 3 may be provided only on either the left or right side, and the fixed outer shell 2 may be formed in a semi-cylindrical shape.

  Between the pair of upper and lower support blocks 5a and 5b attached to the side surface of the support wall 4 vertically provided between the upper and lower fixed outer shells 2 and the rear inner surface of the movable outer shell 3, a plurality of widening jacks 6A are provided vertically and horizontally. A plurality of support blocks 7a and 7b attached to the upper and lower fixed outer shells 2 and a pair of upper and lower support blocks 8a and 8b attached to the inner surface of the front half of the movable outer shell 3 are horizontally arranged. The widening jack 6B is horizontally mounted.

  Accordingly, all the widening jacks 6A and 6B extend synchronously from the state shown in the figure, so that the movable outer shell 3 slides in the direction of increasing the tunnel diameter with respect to the fixed outer shell 2, thereby causing the excavator body 1 to move. Then, the width is increased together with the existing segment S at the end portion (tail portion).

  A cutter head 10 is rotatably mounted on the front portion of the excavator main body 1 (fixed outer shell 2), and a number of cutter bits 11 are fixed to the front surface of the cutter head 10. A ring gear 12 is fixed to the rear portion of the cutter head 10, and a drive motor 13 is attached to the fixed outer shell 2, and a drive gear 14 of the drive motor 13 is engaged with the ring gear 12.

  Accordingly, when the drive motor 13 is driven to drive the drive gear 14 to rotate, the cutter head 10 can be rotated via the ring gear 12.

  A bulkhead 15 is attached to the excavator main body 1 (fixed outer shell 2) behind the cutter head 10, and a chamber 16 is formed between the cutter head 10 and the bulkhead 15. The chamber 16 is open at the other end of the mud pipe 17 and the mud pipe 18 with one end extending to the outside of the mud shield excavator. An agitator 19 for stirring and mixing the excavated earth and mud is provided. A copy cutter 20 is provided on the outer periphery of the cutter head 10 and a spoke expansion / contraction jack 21 is provided in the spoke.

  A plurality of shield jacks 22 are juxtaposed in the circumferential direction at the rear of the excavator main body 1 (the fixed outer shell 2 and the movable outer shell 3), and the shield jacks 22 extend rearward in the excavation direction to extend the existing segment S. By pushing against the excavator main body 1, the entire mud shield shield excavator can be advanced by the reaction force.

  In addition, an erector device 24 is attached to the rear portion of the excavator body 1 (fixed outer shell 2) via a pair of left and right vertical beams 23. The erector device 24 can be assembled in a ring shape by installing a new segment S in a space between the excavator body 1 (the fixed outer shell 2 and the movable outer shell 3) advanced by the shield jack 22 and the existing segment S. it can.

  A tail seal device 26 is provided at the rear end (tail portion) of the excavator body 1 (the fixed outer shell 2 and the movable outer shell 3).

  The tail seal device 26 will be described with reference to FIGS. A long fitting groove 27a is formed in the side edge of the fixed outer shell 2 in the front-rear direction (digging direction), and the rear end of the fitting groove 27a is opened downward by a pair of front and rear notches 28a, 28b. (See FIG. 2). On the other hand, a fitting plate 29 slidable in the tunnel radial direction is formed integrally with the fitting groove 27a at the side edge of the movable outer shell 3, and the notch 28a is formed at the rear end of the fitting plate 29. , 28b are integrally formed with a pair of front and rear slide blocks 30a, 30b that can slide in the tunnel radial direction (see FIG. 4).

  Further, a plurality of (two in the illustrated example) seal members 31 a and 31 b extend in the front-rear direction between the sliding surfaces of the fixed outer shell 2 and the movable outer shell 3. In the illustrated example, the seal members 31a and 31b are laid on the fixed outer shell 2 side (see FIGS. 2 and 5).

  Then, on the inner surface of the fixed outer shell 2, belt-shaped first tail seal brushes 33a to 33d are installed over a plurality of stages in the front-rear direction (four stages in the illustrated example), and on the inner surface of the movable outer shell 3, At a position slidable in the tunnel radial direction with respect to the first tail seal brushes 33a to 33d, a belt-like first over a plurality of stages (four stages corresponding to the first tail seal brushes 33a to 33d in the illustrated example). Two tail seal brushes 34a to 34d are installed (see FIG. 1).

  The first tail seal brushes 33a to 33d and the second tail seal brushes 34a to 34d are mounted in the vertical direction and the horizontal direction at the mounting portions, and the vertical and horizontal directions are between the first and second tail seal brushes. As a pair, they come into sliding contact with each other. In the illustrated example, the first tail seal brushes 33a and 33c are attached horizontally at the front edges of the notches 28a and 28b, and the first tail seal brushes 33b and 33d are attached vertically at the rear edges of the notches 28a and 28b. On the other hand, the second tail seal brushes 34a, 34c are attached vertically at the front edges of the blocks 30a, 30b, and the second tail seal brushes 34b, 34d are attached horizontally at the rear edges of the blocks 30a, 30b. The first and second tail seal brushes are back to back with each other (see FIG. 3).

  In addition, at the attachment portions of the first tail seal brushes 33b and 33d and the second tail seal brushes 34a and 34c attached in the vertical direction, the respective brush tips are attached to the outer surface sides of the main line segment S1 and the widened segment S2. First air tubes 35b, 35d, 35a, and 35c are provided (see FIGS. 2 and 4).

  On the other hand, the second air tubes 36a and 36c for improving the adhesion between the first tail seal brushes 33a and 33c and the second tail seal brushes 34b and 34d, which are attached sideways, are provided at the mounting portions. , 36b and 36d are respectively provided (see FIGS. 2 and 4).

  The first tail seal brushes 33a to 33d and the second tail seal brushes 34a to 34d are known ones in which the proximal end side of the wire brush is sandwiched by a plate and bundled in a plurality of stages to form a belt shape.

  Due to such a configuration, when the shield jack 22 is extended by applying a reaction force to the existing segment S while rotating the cutter head 10, the excavator body 1 moves forward and the face is excavated.

  At this time, mud water is supplied from the mud pipe 17 into the face and the chamber 16, mixed and stirred with excavated sediment by the agitator 19, and discharged from the mud pipe 18 to the outside of the mud shield excavator.

  Thereafter, a new segment S is attached to the space formed by shrinking the shield jack 22 by the erector device 24 and assembled in a ring shape. Thereafter, by repeating this, a tunnel having a predetermined length is constructed.

  Then, when the muddy water type shield excavator reaches the widening position of the tunnel, the copy cutter 20 and / or the spoke telescopic jack 21 is appropriately operated to perform surplus drilling, and all the widening jacks 6A and 6B in the excavator main body 1 are used. Are extended synchronously (simultaneously), and the movable outer shell 3 is slid relative to the stationary outer shell 2 in the direction of increasing the tunnel diameter (see FIGS. 5 and 6).

  Thereby, the excavator body 1 is widened together with the existing segment S at the rear end (tail portion), and the tunnel is partially widened. Note that when the tunnel is widened by a predetermined distance and then narrowed, it is obvious that the opposite operation is performed, and the description thereof will be omitted.

  During the above-described widening operation, in the tail seal device 26, the first tail seal brushes 33a to 33d of the fixed outer shell 2 and the second tail seal brushes 34a to 34d of the movable outer shell 3 are arranged in four stages in the front-rear direction. Since they are arranged and are in sliding contact with each other in the tunnel radial direction, they can sufficiently cope with high water pressure stop water.

  Then, the first and second tail seal brushes 33a to 33d, 34a to 34a are applied by the urging force of the first air tubes 35b, 35d, 35a and 35c expanded by the pressurized air supplied from the pressurized air supply source (not shown). Adhesion with the outer surfaces of the main line segment S1 and the widened segment S2 of 34d is enhanced, so that sufficient sealing performance is obtained.

  Further, the first and second tail seal brushes 33a to 33d and 34a to 34a are applied by the urging force of the second air tubes 36a, 36c, 36b and 36d expanded by the pressurized air supplied from the pressurized air supply source (not shown). Since the adhesion between 34d is improved, the sealing performance is further improved.

  Also, since the first and second tail seal brushes are in sliding contact with each other in the vertical direction and in the horizontal direction, the first tail seal brush and the second tail seal brush are assembled so-called back to back. The mutual adhesion is enhanced, and the sealing performance is further enhanced.

  Needless to say, the present invention is not limited to the above embodiments, and various modifications can be made without departing from the scope of the present invention. For example, the number of stages and the mounting structure of the first and second tail seal brushes 33a to 33d and 34a to 34d may be changed, or the sliding (sliding) structure of the fixed outer shell 2 and the movable outer shell 3 may be changed. May be. Moreover, although this invention showed the example using a muddy water type | mold shield excavator, you may use an earth pressure type shield excavator.

It is a brush arrangement | positioning figure of the different operation state of the tail seal apparatus which shows one Example of this invention. It is the sectional view on the AA line of FIG.1 (b). It is the BB sectional drawing of FIG.1 (b). It is CC sectional view taken on the line of FIG.1 (b). It is the EE sectional view taken on the line of FIG. 3 of a different action state. It is the FF sectional view taken on the line of FIG. 3 of a different operation state. It is a sectional side view of a muddy water type shield excavator. It is the GG line of FIG. 7, and the HH sectional view.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Excavator main body 2 Fixed outer shell 3 Movable outer shell 4 Support wall 5a, 5b Support block 6A, 6B Widening jack 7a, 7b Support block 8a, 8b Support block 10 Cutter head 11 Cutter bit 12 Ring gear 13 Drive motor 14 Drive gear 15 Bulkhead 16 Chamber 17 Mud pipe 18 Mud pipe 19 Agitator 20 Copy cutter 21 Spoke telescopic jack 22 Shield jack 23 Vertical beam 24 Elector device 26 Tail seal device 27a Fitting groove 28a, 28b Notch 29 Fitting plate 30a, 30b Slide Blocks 31a and 31b Seal members 33a to 33d First tail seal brush 34a to 34d Second tail seal brush 35a to 35d First air tube 36a to 36d Second air tube S Existing segment S1 Main line Instrument S2 widening segment

Claims (2)

Excavator main body in which a part of the movable outer shell is superposed on the fixed outer shell so as to be slidable in the tunnel diameter increasing direction, a widening jack for sliding the movable outer shell, and a propulsion for moving the excavator main body forward A jack, a cutter head rotatably supported at a front portion of the excavator body, a driving means for rotationally driving the cutter head, and a brush tip mounted on a rear end portion of the fixed outer shell and the movable outer shell; A tunnel excavator comprising: a main line segment corresponding to a fixed outer shell; and a tail seal device in sliding contact with an outer surface of a widened segment corresponding to a movable outer shell.
The tail seal device includes a belt-shaped first tail seal brush installed on the inner surface of the fixed outer shell in a plurality of stages in the front-rear direction, and the first tail seal brush is slidable on the inner surface of the movable outer shell. together and a second tail seal brush strip placed over a plurality of stages to Do position, the mounting portion of the first tail seal brushes and second tail seal brushes, the first and second tail seal brushes A tunnel comprising a first air tube for urging the brush tip toward the outer surface side of the main line segment and the widened segment, and a second air tube for improving adhesion between the first and second tail seal brushes Excavator. Excavator main body in which a part of the movable outer shell is superposed so as to be slidable in the tunnel diameter expansion direction with respect to the fixed outer shell, a widening jack for sliding the movable outer shell, and a propulsion that advances the excavator main body A jack, a cutter head rotatably supported at a front portion of the excavator body, a driving means for rotationally driving the cutter head, and a brush tip mounted on a rear end portion of the fixed outer shell and the movable outer shell; A tunnel excavator comprising: a main line segment corresponding to a fixed outer shell; and a tail seal device in sliding contact with an outer surface of a widened segment corresponding to a movable outer shell.
The tail seal device includes a belt-shaped first tail seal brush installed on the inner surface of the fixed outer shell in a plurality of stages in the front-rear direction, and the first tail seal brush is slidable on the inner surface of the movable outer shell. And a belt-like second tail seal brush installed in a plurality of stages at different positions, and the brushes of the first and second tail seal brushes at the attachment portions of the first tail seal brush and the second tail seal brush A first air tube for urging the tip toward the outer surface side of the main line segment and the widening segment is provided, and the first tail seal brush and the second tail seal brush are attached vertically and horizontally at the attachment portion; features and to belt tunnel excavator that transverse to that of the vertical ones and are sliding contact in pairs is between the first and second tail seal brushes.

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