JP4413178B2 - 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 There is a concern that it is difficult to maintain good adhesion with the tail seal brush over a long period of time.

  The present invention provides a tunnel excavator equipped with a tail seal device that can sufficiently cope with high water pressure stop water while effectively forming a water stop system without increasing the length of the machine. For the purpose.

In order to achieve such an object, a tunnel excavator according to the present invention includes an excavator body in which a part of a movable outer shell is superposed on a fixed outer shell so as to be slidable in the direction of tunnel diameter expansion, and the movable outer shell. A widening jack for sliding the shell, a propulsion jack for advancing the excavator body, a cutter head rotatably supported at the front of the excavator body, a driving means for driving the cutter head to rotate, Tunnel excavation provided with a tail seal device that is mounted on the rear end of the fixed outer shell and the movable outer shell and the brush tip slides on the outer surface of the main line segment corresponding to the fixed outer shell and the widened segment corresponding to the movable outer shell. In the machine
The tail seal device is installed on the inner surface of the fixed outer shell in a plurality of steps in the front-rear direction, and on the inner surface of the movable outer shell in a plurality of steps in the front-rear direction. It was provided with a belt-shaped second tail seal brushes, second tail sealing a plurality of stages except the first end face seal brush and the last stage for connecting an end portion of the first tail seal brushes in a plurality of stages except the last stage A second end face seal brush for connecting the end portions of the brush, and one of the first end face seal brush and the second end face seal brush is formed in an L shape in plan view, and the tunnel radial direction extension portion One of the other tunnel radial extending portions is positioned in the gap between each tail seal brush at the last stage and the tail seal brush just before it, and is slidably contacted in the tunnel radial direction, while the first tail seal at the last stage is placed. The Ruburashi and second tail seal brushes, characterized in that its ends are in sliding contact directly the tunnel radially.

  Further, the first end face seal brush and the second end face seal brush have a plurality of wire brush rows in the width direction.

  The wire brushes adjacent to at least the tunnel radial direction of the first end face seal brush and the second end face seal brush are provided so as to be shifted by one row in the front-rear direction, and the first end face seal brush and the second end face seal brush are slid. A water stop auxiliary brush for sealing a gap between the wire brush rows at the contact portion is provided.

  Further, a mesh is interposed between the wire brush rows of the first end face seal brush and the second end face seal brush.

  According to the tunnel excavator of the present invention, the first end seal brush and the second end seal brush can be connected to the tunnel diameter while the first and second tail seal brushes can sufficiently cope with high water pressure stop water. By making sliding contact with the brush side surface in the direction, it is possible to effectively form a water stop system without increasing the captain.

  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 states of a tail seal device according to an embodiment of the present invention, FIG. 2 is a sectional view taken along the line DD in FIG. 1A, and FIG. 3 is E in FIG. 4 is an enlarged view of a portion C in FIG. 1A, FIG. 5 is a sectional view taken along line AA in FIG. 4, FIG. 6 is a sectional view taken along line BB in FIG. 4, and FIG. 1 is a cross-sectional view taken along line I-I of FIG. 1, FIG. 8 is a cross-sectional view taken along line JJ of FIG. 1, FIG. 9 is a side cross-sectional view of a mud shield excavator, and FIG. It is sectional drawing.

  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 fitting groove 27 that is long in the front-rear direction (digging direction) is formed at the side edge of the fixed outer shell 2, and the rear end portion of the fitting groove 27 is opened downward by a notch 28. On the other hand, a fitting plate 29 slidable in the tunnel radial direction is formed integrally with the fitting groove 27 at the side edge of the movable outer shell 3, and the notch 28 is formed at the rear end of the fitting plate 29. A slide block 30 slidable in the tunnel radial direction is integrally formed.

  Also, on the side between the sliding surfaces of the notch 28 of the fixed outer shell 2 and the slide block 30 of the movable outer shell 3, the first end surface sealing brush 37 and the second end surface sealing brush 38, which will be described later, are in sliding contact. Further, a waterproof rubber plate 32 supported by the iron plate 31 is interposed on the fixed outer shell 2 side (see FIGS. 4 to 6).

  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, Band-shaped second tail seal brushes 34a to 34d are installed over a plurality of stages in the front-rear direction (four stages in the illustrated example) (see FIGS. 1 and 8).

  Of the first tail seal brushes 33a to 33d, the first tail seal brushes 33a to 33c except for the last stage extend in the tunnel radial direction after their end portions are bent 90 ° rearward at a predetermined distance. The first end face seal brush (tunnel radial direction extending portion) 37 is connected. On the other hand, of the second tail seal brushes 34a to 34d, the second tail seal brushes 34a to 34c excluding the last stage are connected by a half portion 38a of the second end face seal brush 38 extending in the front-rear direction. At the same time, the other half portion (tunnel radial direction extending portion) 38b of the second end surface seal brush 38 is bent 90 ° in the tunnel radial direction so as to be in sliding contact with the first end surface seal brush 37 on the side surface of the wire brush. It has become.

  The first tail seal brushes 33a to 33d are attached in the vertical direction (see FIG. 8), while the second tail seal brushes 34a to 34d are attached in the horizontal direction (see FIG. 7). The first tail seal brush 33d and the second tail seal brush 34d are in direct contact with each other in the tunnel radial direction by so-called back-to-back so as to prevent entry of foreign matter, gravel and the like. Furthermore, the first tail seal brush 33d and the second tail seal brush 34d at the last stage are a first air tube 35 attached to the fixed outer shell 2 side and a second air tube 36 attached to the movable outer shell 3 side. Thus, mutual adhesion can be improved (see FIG. 7).

  Unlike the first tail seal brushes 33a to 33d, the first end face seal brush 37 is attached so that the tip of the brush is inclined in the tunnel radial direction (see FIGS. 2 and 3). On the other hand, unlike the second tail seal brushes 34a to 34d, the other half portion 38b of the second end face seal brush 38 is inclined so that its brush tip is inclined in the tunnel radial direction (in the same direction as the first end face seal brush 37). It is attached (see FIG. 2 and FIG. 3).

  As shown in FIGS. 5 and 6, the first end face seal brush 37 and the second end face seal brush 38 are longitudinally sandwiched between plates 37a and 38c and the spacers 37b and 38d. A plurality of strips (wire brush rows) bundled in a plurality of stages are provided in the width direction in a plurality of rows (five rows in the illustrated example).

  The wire brushes adjacent to at least the tunnel radial direction of the first end face seal brush 37 and the second end face seal brush 38 are provided so as to be shifted in one row in the front-rear direction, and the first end face seal brush 37 and the second end face seal brush. The water stop auxiliary brushes 39 and 40 for sealing the gaps (see FIG. 5) between the wire brush rows at the sliding contact portion 38 are the spacer 37b of the first end face seal brush 37 and the second end face seal brush 38 (38b). The spacers 38d are respectively provided.

  In addition, a mesh 41 is appropriately interposed between the wire brush rows of the first end face seal brush 37 and the second end face seal brush 38 (see FIGS. 5 and 6), and the wire brush is entangled between the wire brush rows. You may make it prevent. Each of the first tail seal brushes 33a to 33d, the second tail seal brushes 34a to 34d, and the wire brush rows of the first end face seal brush 37 and the second end face seal brush 38 is appropriately supplied with grease. The sliding contact on the side surface and the sliding contact with the main line segment S1 and the widening segment S2 at the brush tip are smoothly performed.

  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. 2 and 3).

  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 the first end face seal brush 37 and the second end face seal brush 38 are in sliding contact with each other on the side surface of the wire brush in the tunnel radial direction, they can sufficiently cope with high water pressure stop water. .

  At this time, in the first end face seal brush 37 and the second end face seal brush 38 (the other half portion 38b) slidably in contact therewith, the gaps between the wire brush rows (including the sliding gap portion a) are mutually tunnel diameters. It is completely sealed and water-stopped by wire brushes and water-stop auxiliary brushes 39 and 40 that are adjacent to each other and shifted in one line in the front-rear direction.

  Then, the first and second tail seal brushes 33d and 34d in the last stage are urged by the urging force of the first air tube 35 and the second air tube 36 expanded by the pressurized air supplied from the pressurized air supply source (not shown). Since the adhesion between the main line segment S1 and the outer surface of the widened segment S2 is enhanced, sufficient sealing performance can be obtained.

  In addition, since the first and second tail seal brushes 33d, 34d at the last stage are in sliding contact with each other in the vertical direction and in the horizontal direction, the first tail seal brush 33d and the second tail seal brush 34d However, the so-called back-to-back assembly increases the mutual adhesion and further improves the sealing performance.

  In this embodiment, the second end face seal brush 38 is bent in an L shape in plan view, and the first end face seal brush 37 extended in the tunnel radial direction to the other half portion 38b is slidably contacted with each brush side surface. Although the first tail seal brushes 33a to 33d and the second tail seal brushes 34a to 34d are arranged in four stages in the front-rear direction, the increase in the length of the aircraft is minimized. In addition, it is possible to form a water stop system that can sufficiently cope with the high water pressure stop water.

  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. Further, the relationship (joint structure) between the first end face seal brush 37 and the second end face seal brush 38 may be reversed between the fixed outer shell 2 and the movable outer shell 3. 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 DD sectional view taken on the line of Fig.1 (a). It is the EE sectional view taken on the line of FIG.1 (b). It is the C section enlarged view of Drawing 1 (a). It is the sectional view on the AA line of FIG. It is the BB sectional view taken on the line of FIG. It is the II sectional view taken on the line of FIG. It is the JJ sectional view taken on the line of FIG. It is a sectional side view of a muddy water type shield excavator. FIG. 10 is a cross-sectional view taken along line GG and line HH in FIG. 9.

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 27 Fitting groove 28 Notch 29 Fitting plate 30 Slide block 31 Iron plate 32 Water stop rubber plates 33a to 33d First tail seal brush 34a to 34d Second tail seal brush 35 First air tube 36 Second air tube 37 First end face seal brush 38 Second end face seal brush 39 First water stop auxiliary bra 40 Second water stop auxiliary brush S Existing segment S1 Main line segment S2 Widening segment

Claims (4)

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 is installed on the inner surface of the fixed outer shell in a plurality of steps in the front-rear direction, and on the inner surface of the movable outer shell in a plurality of steps in the front-rear direction. It was provided with a belt-shaped second tail seal brushes, second tail sealing a plurality of stages except the first end face seal brush and the last stage for connecting an end portion of the first tail seal brushes in a plurality of stages except the last stage A second end face seal brush for connecting the end portions of the brush, and one of the first end face seal brush and the second end face seal brush is formed in an L shape in plan view, and the tunnel radial direction extension portion One of the other tunnel radial extending portions is positioned in the gap between each tail seal brush at the last stage and the tail seal brush just before it, and is slidably contacted in the tunnel radial direction, while the first tail seal at the last stage is placed. Ruburashi and a second tail seal brushes, tunneling machine, characterized in that its ends are in sliding contact directly the tunnel radially. 2. The tunnel excavator according to claim 1 , wherein the first end surface seal brush and the second end surface seal brush have a plurality of wire brush rows in the width direction. The wire brushes adjacent to at least the tunnel radial direction of the first end face seal brush and the second end face seal brush are provided so as to be shifted in the front-rear direction, and the sliding contact portion between the first end face seal brush and the second end face seal brush The tunnel excavator according to claim 2 , further comprising a water stop auxiliary brush for sealing a gap between the wire brush rows. The tunnel excavator according to claim 2 or 3 , wherein a mesh is interposed between the wire brush rows of the first end face seal brush and the second end face seal brush.

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