JP5971647B2 - Widening equipment and widening method for existing tunnels - Google Patents

Description

  The present invention relates to a widening apparatus and a widening method for an existing tunnel that partially widens a cross section of an existing tunnel.

  When constructing a branching / merging part of a road tunnel, an emergency parking zone, etc., it is necessary to partially widen the cross section of the existing tunnel (for example, φ 12 m → φ 18 m). As such a widening method, there is a conventional one as shown in FIG. 7, for example (see Patent Document 1).

  This is a segment cutting and expanding method. First, as shown in FIG. 5 (a), a special segment g including a blade segment f is incorporated at the time of primary lining, and then in FIG. 5 (b). As shown, a muddy water reflux device (not shown) is attached to the blade segment f, and the excavator body h is set at a fixed position.

  Next, as shown in FIG. 3C, the cutter i with the expansion device is inserted into the blade segment f, and the box frame j is press-fitted to a predetermined position and expanded while drilling muddy water.

  This widening is performed for each ring, and the opposite side is performed in the same manner. Finally, the side plate of the box frame j is removed, and a widening tunnel as shown in FIG. It is.

JP 59-88598 A

  However, in the widening method as described above, the cutter i with the expansion device is provided so that it can be simply advanced and retracted by the expansion device with respect to the excavator body h. If a large excavation range is required, the diameter of the cutter i with the expansion device must be increased or the number of the cutters must be increased. This increases the cost of the device and increases the cost. There was a problem.

  The present invention has been proposed in view of such circumstances, and an object of the present invention is to provide a widening apparatus and a widening method for an existing tunnel that can be reduced in cost by being made compact and have excellent versatility.

In order to achieve such an object, an existing tunnel widening device according to the present invention includes:
A cylindrical device body capable of moving forward at least in the radial direction of the tunnel in the entrance installed on the inner wall of the existing tunnel;
A plurality of propulsion jacks installed in the existing tunnel to advance the apparatus body;
A telescopic cutter support cylinder that is supported by penetrating through a sealing device through a partition device that partitions the inside of the apparatus main body in the front-rear direction and is movable in the left-right direction;
A saddle member supported by the apparatus main body so as to be movable in the left-right direction while pivotally supporting an intermediate portion in the cylinder axis direction behind the partition wall of the cutter support cylinder in a vertically swingable manner;
First driving means for swinging the cutter support cylinder in the vertical direction;
Second driving means for moving the saddle member in the left-right direction;
A drum cutter attached to the tip located in front of the partition wall of the cutter support tube;
A discharge conveyer that takes in the excavated earth and sand in the apparatus main body in front of the partition by penetrating the suction port in the partition ;
The sealing device includes:
An arcuate guide plate that has an opening that allows the cutter support tube to swing in the vertical direction and move in the horizontal direction, and is fixed to an attachment hole formed in the partition;
The cutter support cylinder can be slidably contacted with the back surface of the guide plate to always close the opening of the guide plate, and a spherical bearing provided at the center thereof and a spherical journal provided at the outer periphery of the cutter support cylinder. A closing plate for penetrating and supporting,
It comprises a guide frame that always presses the back surface of the closing plate forward from the apparatus main body side .

  The guide frame is pressed by a hydraulic jack.

Also,
The cutter support cylinder and the drum cutter are provided in a plurality of stages in the tunnel height direction on the partition wall.

In order to achieve such an object, the widening method of the existing tunnel according to the present invention is as follows:
When the existing tunnel is widened using the existing tunnel widening device, the device main body is advanced while a ring-shaped covering member is added between the device main body and the propulsion jack.

  According to the existing tunnel widening device according to the present invention, in addition to the extension of the cutter support cylinder, the excavation range by the drum cutter can be increased by the vertical swing and the horizontal movement. The number can be reduced, and the cost can be reduced by making the device compact. In addition, since the closing plate supports the cutter support tube through a spherical bearing portion provided at the center thereof and a spherical journal portion provided at the outer periphery of the cutter support tube, the sealing plate is maintained in the vertical direction while maintaining the sealing performance. Oscillation and lateral movement can be allowed with a simple structure.

  According to the widening method of an existing tunnel according to the present invention, the widening length can be increased by arbitrarily advancing the apparatus main body regardless of whether the cutter support cylinder is expanded or contracted, and versatility is enhanced.

It is a sectional side view of the widening apparatus which shows one Example of this invention. It is a front view of a widening apparatus. It is a principal part expansion perspective view of the widening apparatus. It is operation | movement explanatory drawing of the left-right direction movement of a drum cutter. It is the VV sectional view taken on the line of (b) of FIG. It is operation | movement explanatory drawing of the up-down direction rocking | fluctuation of a drum cutter. It is explanatory drawing of the conventional widening construction method.

  Hereinafter, the widening apparatus and widening method of an existing tunnel according to the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 is a side sectional view of a widening device showing one embodiment of the present invention, FIG. 2 is a front view of the widening device, FIG. 3 is an enlarged perspective view of a main part of the widening device, and FIG. FIG. 5 is a cross-sectional view taken along line VV in FIG. 4B, and FIG. 6 is an operation explanatory view of the vertical swing of the drum cutter.

  As shown in FIGS. 1 and 2, an entrance 11 having a rectangular (longitudinal) cross section is installed on a part of an inner wall (widened portion) of an existing tunnel 10 having a circular cross section, and an entrance packing is provided on an inner peripheral surface of the entrance 11. 12 is attached.

  A cylindrical device body 13 having a cross-sectional shape similar to that of the entrance 11 is fitted in the entrance 11 so as to be able to advance (and retreat) in the radial direction (left and right direction in FIG. 1) of the existing tunnel 10. . A plurality of propulsion jacks 14 for advancing the apparatus main body 13 are installed sideways on a frame 15 in the existing tunnel 13 via a support frame 16 that serves as a reaction force receiver.

  The apparatus main body 13 is provided with a partition wall 17 for partitioning the inside of the apparatus main body 13 in the front-rear direction. Cutter support cylinders 18A and 18B are provided on the partition wall 17 in two upper and lower stages via seal devices 19A and 19B, respectively. Is supported through.

The cutter support cylinders 18A and 18B are pivotally supported on the saddle members 20A and 20B (refer to pivot points O ₁ and O ₂ ) so as to be able to swing in the vertical direction at the middle portion in the cylinder axial direction behind the partition wall 17. )

  As shown in FIG. 3, each of the saddle members 20A and 20B includes a pair of left and right inverted T-shaped brackets 21a and 21b and a pair of upper and lower guide cylinders that connect between the upper and lower ends of the brackets 21a and 21b. The guide cylinders 22a and 22b are respectively slidable (movable in the left-right direction) on a pair of upper and lower support shafts 23a and 23b installed horizontally between the left and right parts of the apparatus body 13. It is fitted.

  Each cutter support cylinder 18A, 18B is formed of a double cylinder comprising an inner cylinder 24a and an outer cylinder 24b, and the inner cylinder 24a can be expanded and contracted with respect to the outer cylinder 24b by an expansion / contraction mechanism (not shown). .

  Then, the cutter support cylinders 18A, 18B are provided between the intermediate portion in the cylinder axial direction behind the partition wall 17 of the outer cylinder 24b in each cutter support cylinder 18A, 18B and the upper guide cylinder 22a in each saddle member 20A, 20B. A swing jack (first driving means) 25 that swings in the vertical direction is interposed, and each saddle is interposed between the pair of upper and lower guide cylinders 22a, 22b and the apparatus main body 13 in each of the saddle members 20A, 20B. A pair of upper and lower slide jacks (second drive means) 26a, 26b for moving the members 20A, 20B in the left-right direction are interposed.

  Also, a drum cutter (commonly referred to as a paddle cutter) that rotates in a vertical plane along the advancing direction of the apparatus body 13 (rotates counterclockwise in FIG. 1) at the distal end portion of the inner cylinder 24a located in front of the partition wall 17. 27A and 27B are attached.

  The drum cutters 27A and 27B can be rotated by a built-in motor (not shown). However, the rotational force of the motor provided on the cutter support cylinders 18A and 18B is transmitted through power transmission means such as a gear mechanism. It may be configured to rotate.

  The sealing devices 19A and 19B have a pair of upper and lower mounting holes 17a and 17b formed in the partition wall 17 having openings 28a that allow the cutter support cylinders 18A and 18B to swing in the vertical direction and move in the horizontal direction. Arc-shaped guide plates 28 fixed to the edges of the guide plate 28, and a spherical bearing portion provided at the center of the guide plate 28, which is slidably contacted with the back surface of the guide plate 28 and can always close the opening 28a of the guide plate 28. 29 and a circular journal portion 30 provided on the outer periphery of the outer cylinder 24b of the cutter support cylinders 18A and 18B, and an arc-shaped closing plate 31 that penetrates and supports the cutter support cylinders 18A and 18B (having the same radius of curvature as the guide plate 28). And a guide frame 32 that constantly presses the back surface of the closing plate 31 forward from the apparatus main body 13 side.

  In the illustrated example, the guide frame 32 is formed in a square frame shape, and is attached to the apparatus main body 13 via a plurality of hydraulic jacks 33 attached to the back side of the guide plate 32 from the side of the mounting plate 34 that is always attached to the closing plate 31. The back side is pressed so that the front side of the closing plate 31 is pressed against the back side of the guide plate 28.

  In addition, two discharge conveyors 35 are provided in both the left and right sides of the apparatus main body 13 so as to penetrate the suction port 35a in the lower part of the partition 17 in FIG. The

  Due to such a configuration, when widening a predetermined widened portion of the existing tunnel 10, first, the device main body 13 of the widening device is fitted into the entrance 11 installed in advance on the inner wall of the existing tunnel 10. The existing lining members (segments and the like) in the widened portion 40 of the existing tunnel 10 are removed as necessary before and after the apparatus main body 13 is fitted.

  Next, the cutter support cylinders 18A and 18B with the drum cutters 27A and 27B are assembled in the apparatus main body 13 together with the swing jack 25 and the slide jacks 26a and 26b via the seal devices 19A and 19B and the saddle members 20A and 20B. At the same time, the discharge conveyor 35 is set.

  Thereafter, a plurality of propulsion jacks 14 are attached to the gantry 15 installed in the existing tunnel 10 via the support frame 16, and the preparation for widening is completed.

After the preparation is completed, the drum cutters 27A and 27B are rotated by a motor drive (not shown) and the cutter support cylinders 18A and 18B are moved up and down around the pivot points O ₁ and O ₂ by expansion and contraction of the swing jack 25. While swinging, the cutter support cylinders 18A and 18B (strictly speaking, the inner cylinder 24a) are appropriately extended by an expansion / contraction mechanism (not shown) to start excavation of the face at the widened portion.

  When each cutter support cylinder 18A, 18B is extended to the maximum extent, for example, when excavation at the excavation section D in the vertical plane as shown in FIGS. The cutter support cylinders 18A and 18B are contracted by stopping the rotation and swinging of 27A and 27B, and the drum cutters 27A and 27B are pulled into the existing tunnel 10.

  From this state, the slide jacks 26a and 26b are contracted, for example, and the cutter support cylinders 18A and 18B are moved to the left via the saddle members 20A and 20B, and then excavated by the same excavation method as described above. Thus, as shown in FIG. 4A, the excavation area in the horizontal plane can be expanded from A to B in the left-right direction, and then the slide jacks 26a and 26b are extended, for example, and the saddle members 20A and 20B are expanded. After the cutter supporting cylinders 18A and 18B are moved to the right via the digging, the excavation method is the same as the excavation method described above, thereby excavating in the horizontal plane as shown in FIG. The area can be expanded from A + B to C in the left-right direction.

  The excavated earth and sand are taken into the lower part of the apparatus main body 13, and the taken excavated earth and sand are discharged out of the apparatus main body 13 by the discharge conveyor 35 and discharged outside by a discharge means (not shown). At this time, the through portions of the cutter support cylinders 18A and 18B in the partition wall 17 have openings 28a in the guide plates 28 of the sealing devices 19A and 19B, as shown in FIGS. 4 to 6, in the vertical direction of the cutter support cylinders 18A and 18B. Even when under the rocking movement and the movement in the left-right direction, the closing plate 31 is always closed by the engagement between the spherical bearing portion 29 of the closing plate 31 and the spherical journal portion 30 of the cutter support cylinders 18A, 18B. Therefore, inundation into the existing tunnel 10 is reliably prevented. In addition, in the entrance 11, the entrance packing 12 reliably prevents water from entering the existing tunnel 10.

  Thereafter, all the propulsion jacks 14 are extended to advance the apparatus main body 13 and the excavation is pushed forward, whereby the widened portion 40 having a predetermined length is excavated. That is, the widening portion of the existing tunnel 10 is widened over a predetermined width. At this time, after the maximum stroke of all the propulsion jacks 14, the necessary propulsion jacks 14 are contracted one by one or several at a time, and a push tube or the like (ring-shaped covering) is formed in the gap with the apparatus main body 13 thus formed. The length of the widened portion 40 may be increased by inserting a construction member).

  As described above, according to this embodiment, the excavation range by the drum cutters 27A and 27B is increased by the vertical swing and the horizontal movement in addition to the extension of the cutter support cylinders 18A and 18B. , 27B can be reduced in size and number, and the cost can be reduced by making the widening device compact.

  Further, since the blocking plate 31 penetrates and supports the cutter support cylinders 18A and 18B with the spherical bearing portion 29 provided at the center thereof and the spherical journal portion 30 provided on the outer periphery of the cutter support cylinders 18A and 18B, the sealing plate 31 maintains the sealing performance. However, it is possible to allow the cutter support cylinders 18A and 18B to swing in the vertical direction and move in the horizontal direction with a simple structure.

  In addition, regardless of whether the cutter support cylinders 18A and 18B are expanded or contracted, by inserting or adding a push tube or the like, the apparatus main body 13 can be arbitrarily advanced to increase the widening length, so that versatility is enhanced.

  It goes without saying that the widening device described above may be rearranged in the longitudinal direction of the existing tunnel 10 to form the widened portion 40 over a predetermined length in the longitudinal direction of the existing tunnel 10.

  In addition, this invention is not limited to the said Example, Of course, various changes, such as providing a cutter support cylinder and a drum cutter 3 steps or more in a tunnel height direction, are possible in the range which does not deviate from the summary of this invention. Absent.

DESCRIPTION OF SYMBOLS 10 Existing tunnel 11 Entrance 12 Entrance packing 13 Apparatus main body 14 Propulsion jack 15 Base 16 Support frame 17 Bulkhead 18A, 18B Cutter support cylinder 19A, 19B Sealing apparatus 20A, 20B Saddle member 21a, 21b Bracket 22a, 22b Guide cylinder 23a, 23b Shaft 24a Inner cylinder 24b Outer cylinder 25 Swing jack 26a, 26b Slide jack 27A, 27B Drum cutter 28 Guide plate 28a Opening 29 Spherical bearing portion 30 Journal portion 31 Blocking plate 32 Guide frame 33 Hydraulic jack 34 Mounting plate 35 Discharge conveyor 35a Suction port 40 Widening part A, B, C Excavation area D Excavation section in vertical plane O ₁ , O ₂ Cutter support tube pivot

Claims (4)

A cylindrical device body capable of moving forward at least in the radial direction of the tunnel in the entrance installed on the inner wall of the existing tunnel;
A plurality of propulsion jacks installed in the existing tunnel to advance the apparatus body;
A telescopic cutter support cylinder that is supported by penetrating through a sealing device through a partition device that partitions the inside of the apparatus main body in the front-rear direction and is movable in the left-right direction;
A saddle member supported by the apparatus main body so as to be movable in the left-right direction while pivotally supporting an intermediate portion in the cylinder axis direction behind the partition wall of the cutter support cylinder in a vertically swingable manner;
First driving means for swinging the cutter support cylinder in the vertical direction;
Second driving means for moving the saddle member in the left-right direction;
A drum cutter attached to the tip located in front of the partition wall of the cutter support tube;
A discharge conveyer that takes in the excavated earth and sand in the apparatus main body in front of the partition by penetrating the suction port in the partition ;
The sealing device includes:
An arcuate guide plate that has an opening that allows the cutter support tube to swing in the vertical direction and move in the horizontal direction, and is fixed to an attachment hole formed in the partition;
The cutter support cylinder can be slidably contacted with the back surface of the guide plate to always close the opening of the guide plate, and a spherical bearing provided at the center thereof and a spherical journal provided at the outer periphery of the cutter support cylinder. A closing plate for penetrating and supporting,
A widening device for an existing tunnel, comprising a guide frame that constantly presses the back surface of the closing plate forward from the device main body side . The apparatus for widening an existing tunnel according to claim 1 , wherein the guide frame is pressed by a hydraulic jack. The existing tunnel widening device according to claim 1 or 2 , wherein the cutter support cylinder and the drum cutter are provided on the partition wall in a plurality of stages in the tunnel height direction. When widening an existing tunnel using the existing tunnel widening device according to any one of claims 1 to 3 , the device is provided with a ring-shaped covering member added between the device main body and the propulsion jack. Widening method of existing tunnel characterized by moving the main body forward.

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