JP4848566B2 - Self-propelled erector and tunnel construction method - Google Patents

Description

  The present invention relates to a self-propelled erector that self-propels in a pit and assembles a segment in the pit, and a tunnel construction method using the self-propelled erector.

  Conventionally, a NATM construction method is known as a construction method of, for example, a mountain tunnel (for example, see Patent Document 1).

  In the NATM construction method, for example, a tunnel is formed by forming a digging hole by machine digging or blasting excavation such as a free section tunnel excavator and blowing concrete to the inner wall of the digging hole.

JP 2006-336259 A

  By the way, when the fall of the groundwater level due to the construction of the mountain tunnel has a great influence on the natural environment, it is necessary to stop the water, and it is necessary to form a water tight (lining water stop structure) section.

  When stopping water, the NATM method described above requires a long distance from the face to the concrete lining due to the end of the watertight section, and it takes a long time to start the lining work, or waiting for the concrete to harden. To do.

  Therefore, it is conceivable to assemble segments in the main mine.

  However, in general, since the assembly of the segments is performed by an erector that forms a part of the shield machine, there has been no example of construction in the past without using a shield machine for excavation of the main pit as in the above-described NATM construction method.

  Accordingly, an object of the present invention is to provide a self-propelled erector and a tunnel construction method that can solve the above-described problems and can assemble a segment by self-propelling in a burrow.

  In order to achieve the above object, the present invention is a self-propelled erector that self-propells in a digging hole and assembles a segment in the digging hole, and an erector main body for assembling the segment, and for supporting the erector main body. An inner cylinder, a plurality of outer cylinders slidably fitted in the front-rear direction on the outer circumference of the inner cylinder, and the outer segments projecting outward from the outer circumference of each outer cylinder to press the existing segments; Gripper means that can be retracted to each other, slide means for relatively moving or fixing each outer cylinder and the inner cylinder in the front-rear direction, and a conveyance passage formed in the inner cylinder and passing through the inner cylinder in the front-rear direction It is equipped with.

  Preferably, the gripper means includes a seat that contacts the existing segment and a gripper jack for pressing the seat against the existing segment.

  Preferably, the slide means is composed of a slide jack that is fixed to the inner cylinder and the outer cylinders and that is extendable in the front-rear direction.

  Preferably, an invert pier for conveying excavated soil from the face side to the wellhead side is provided in the transport passage, extending in the front-rear direction in the digging hole.

  Preferably, a hoist for supplying a segment to the erector main body is provided, and a notch groove extending in the front-rear direction is formed in the lower part of the inner cylinder and the outer cylinder so that the hoist can be moved in the front-rear direction. It is.

  In order to achieve the above object, the present invention is to assemble a segment by a self-propelled erector in a desired water stop section of a digging hole.

  Preferably, concrete is sprayed on the back surface of the assembled segment to fix the segment.

  According to the present invention, an excellent effect is exhibited in that a segment can be assembled in a desired section by self-propelling in a burrow.

  Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

  The self-propelled erector of this embodiment is located, for example, behind a free-section tunnel excavator that excavates a tunnel, and assembles a segment into a pit formed by the free-section tunnel excavator and automatically It is what runs.

  First, the schematic structure of the self-propelled erector according to the present embodiment will be described with reference to FIGS.

  As shown in FIG. 1, a self-propelled erector 1 includes an erector body 6 for assembling a segment 3, and an inner cylinder that supports the erector body 6 and extends rearward (rightward in FIG. 1) from the erector body 6. 2 and a plurality of outer cylinders 41-43 slidably fitted to the outer circumference of the inner cylinder 2 in the front-rear direction, and the outer cylinder 41-43 and the inner cylinder 2 are moved relative to each other to thereby self-propelled erector 1 Slide means 5 for imparting a propulsive force to each other, gripper means 7 provided in each outer cylinder 41-43 for taking a propulsion reaction force in the existing segment 3, and formed in the inner cylinder 2 In order to supply hydraulic pressure to the conveyance path 8 (see FIG. 2) inserted in the front-rear direction, the control panel 10 for controlling the self-propelled erector 1, and the various hydraulic devices 6, 7, 31 of the self-propelled erector 1. Hydraulic supply source 11 , And a hoist 12 for supplying the segment 3 to the erector body 6.

  As shown in FIG. 2, each outer cylinder 41-43 is formed in a substantially octagonal cross section. On the lower surface of the outer cylinder 41-43, a notch groove 14 for allowing the chain block 13 of the hoist 12 to move in the front-rear direction is continuously formed in the front-rear direction from the front end to the rear end of the outer cylinder 41-43. Is done.

  A plurality of gripper means 7 are provided on the outer periphery of each outer cylinder 41-43. The gripper means 7 is configured to project from the outer periphery of the outer cylinder 41-43 to the existing segment 3 so as to support the outer cylinder 41-43, press the existing segment 3, and to be retracted inward (radially inward). Is done.

  The gripper means 7 of the present embodiment includes a receiving seat 16 that contacts the existing segment 3 and a gripper jack 15 for pressing the receiving seat 16 against the existing segment 3.

  A pair of gripper jacks 15 is provided on the top, bottom, left and right of each outer cylinder 41-43. That is, a pair of gripper jacks 15 and 15 that can be expanded and contracted in the vertical direction are provided on the upper and lower portions of the outer cylinder 41-43, respectively, and can be expanded and contracted in the left and right directions on the left and right sides of the outer cylinder 41-43. A pair of gripper jacks 15, 15 is provided.

  More specifically, a base member 18 having a horizontal mounting surface and a vertical mounting surface is formed on the inclined surface between the upper surface and the left side surface of the outer cylinder 41-43, and the horizontal mounting surface of the base member 18 is formed. A gripper jack 15 that can be expanded and contracted in the vertical direction is attached, and a gripper jack 15 that can be expanded and contracted in the horizontal direction is attached to a vertical mounting surface.

  Similarly, on the other inclined surfaces (between the upper surface and the right side surface, between the lower surface and the left side surface, and between the lower surface and the right side surface) of the outer cylinder 41-43, A gripper jack 15 that can be expanded and contracted in the vertical direction and a gripper jack 15 that can be expanded and contracted in the horizontal direction are provided.

  The gripper jack 15 is operated by, for example, hydraulic pressure, and expansion / contraction is controlled independently for each gripper jack 15 so that the segment 3 can be held in a perfect circle.

  The receiving seat 16 is attached to each of the pair of gripper jacks 15, 15 arranged on the upper, lower, left and right sides of the outer cylinders 41-43. That is, four seats 16 are provided in each outer cylinder 41-43.

  The seat 16 is formed in an arc shape extending in the circumferential direction along the inner peripheral surface of the existing segment 3 from one tip of the pair of gripper jacks 15, 15 to the other tip.

  A slide bearing 17 that supports the inner cylinder 2 so as to be slidable in the front-rear direction is provided on the inner peripheral surface of the outer cylinder 41-43. Two sliding bearings 17 are provided on the lower surface, the left side surface, and the right side surface of each outer cylinder 41-43.

  The inner cylinder 2 includes an inner cylinder body 20 having a substantially octagonal cross section in which outer cylinders 41 to 43 are fitted together, and a connecting portion 21 having a substantially circular cross section extending forward from the inner cylinder body 20.

  A cutout groove 23 is formed on the lower surface of the inner cylinder main body 20 so that the chain block 13 of the hoist 12 can be moved in the front-rear direction similarly to the outer cylinders 41-43. The cutout groove 23 is continuously formed in the front-rear direction from the front end to the rear end of the inner cylinder main body 20.

  A plurality of slide means 5 are provided on the outer periphery of the inner cylinder main body 20. The slide means 5 of the present embodiment includes a slide jack 24 that is fixed to the inner cylinder main body 20 and the outer cylinders 41-43, and is extendable in the front-rear direction. The slide jack 24 expands and contracts to relatively move the inner cylinder 2 and each outer cylinder 41-43 in the front-rear direction, and is fixed to restrict relative movement between the inner cylinder 2 and each outer cylinder 41-43. To do.

  A plurality of slide jacks 24 of the present embodiment are provided behind each outer cylinder 41-43 at intervals along the outer periphery of the outer cylinder 41-43 (inner cylinder main body 20). One by one).

  More specifically, the outer cylinder 41-43 (inner cylinder main body 20) is positioned on the inner side of the gripper jack 15 at both the left and right end portions on the upper surface and the lower surface and on the left and right end portions in the vertical direction. Let each be placed.

  The expansion / contraction stroke of the slide jack 24 is set longer than the axial length of at least one segment 3. The slide jack 24 is operated by, for example, hydraulic pressure.

  The conveyance path 8 is defined by an inner peripheral surface of the inner cylinder main body 20 and the connecting portion 21, and an invert pier 22 extending in the front-rear direction in the digging hole is disposed in the conveyance path 8.

  On the invert pier 22, a dump truck 23 for transporting the earth and sand discharged on the front face side to the rear pit side and a carriage (not shown) for transporting materials from the pit side to the face side pass. It is like that. A hoist rail (not shown) extending in the front-rear direction from the wellhead side to the erector main body 6 is provided below the invert pier 22, and the segment 3 is supplied to the erector main body 6 by the chain block 13 that travels on the hoist rail. Is done.

  The erector main body 6 supports a gripping portion 26 for gripping the segment 3, a suspension beam 27 to which the gripping portion 26 is attached and movable in the radial direction, and the suspension beam 27 via an arm portion 28, And a ring-shaped rotating frame 35 rotatably supported by a ring girder 34 described later.

  The ring girder 34 is disposed at the front end portion of the self-propelled erector 1, and is connected to and supported by the inner cylinder main body 20 via the connecting portion 21 of the inner cylinder 2.

  A support roller 30 for rotatably supporting the rotating frame 35 of the erector body 6 is provided on the inner periphery of the ring girder 34. A plurality (eight in the illustrated example) of the support rollers 30 are arranged along the inner periphery of the ring girder 34.

  On the outer periphery of the ring girder 34 is provided an outrigger 31 that extends to the inner wall surface of the digging hole on the outer side in the radial direction and supports the load of the ring girder 34.

  A plurality of the outriggers 31 are provided. In the illustrated example, six outriggers 31 are disposed below and two are disposed above the load. The outrigger 31 of the present embodiment is formed to be extendable and contractable in the radial direction.

  The ring girder 34 is provided with a working scaffold 32 formed in a substantially ring shape in the circumferential direction along the segment 3 (inner wall surface of the digging hole). The work scaffold 32 is provided with a slide scaffold 33 that can be projected rearward from the work scaffold 32 toward the inner peripheral side of the segment 3.

  As shown in FIG. 4, the self-propelled erector 1 of the present embodiment has spraying means (for example, concrete and quick setting) for blowing concrete into the back surface of the segment 3 (between the segment 3 and the inner wall of the digging hole). A material supply hose 40 and a concrete sprayer nozzle 41).

  Further, the segment 3 of the present embodiment includes a bolt 37 and a nut 47 for coupling the segment 3 assembled by the erector main body 6 to the existing segment 3.

  The bolt 37 is formed so that the bolt hole 41 can be inserted into the same position on the cross section of the front and rear joint portion (between rings) of the segment 3, and a male screw portion that can be screwed into a female screw portion such as a nut 47 is formed at the tip. The segment 3 is pressed against the existing segment 3 by screwing the bolt into a female thread portion such as a nut, fixing the bolt 37 with a spanner or the like, and rotating the nut 47.

  Next, a tunnel construction method using the self-propelled erector of this embodiment will be described.

  In the tunnel construction method of the present embodiment, when constructing a mountain tunnel or the like, first, a digging hole is mechanically excavated by a free section tunnel excavator or the like, and a digging hole is blasted and excavated in a desired water stop section in the digging hole. The segment 3 is assembled by the self-propelled erector 1 and concrete is sprayed on the rear surface of the assembled segment 3 so that the segment 3 is fixed to the digging hole.

  The operation of the self-propelled erector when constructing the watertight section will be described with reference to FIGS.

  First, the state of the self-propelled erector 1 at the time of segment assembly and concrete spraying will be described.

  As shown in FIG. 5, at the time of segment assembly and concrete spraying, all the gripper jacks 15 of the third outer cylinder 43 are extended from the first outer cylinder 41 and the existing segments 3 are secured by their seats 16. Hold a circle. Further, the slide jack 24 of the first outer cylinder 41 (and the second outer cylinder 42 and the third outer cylinder 43) is extended to position the erector main body 6 at a predetermined position immediately before the existing segment 3. Furthermore, the outrigger 31 of the ring girder 34 is extended, and the load of the ring girder 34 and the elector body 6 is supported by the inner wall surface of the digging hole through the outrigger 31.

  After the segment assembly and the concrete spraying in FIG. 5 are completed, the self-propelled erector 1 moves forward by one segment (to the left in FIG. 5) to assemble the next segment 3.

  The self-propelled method of the self-propelled erector 1 will be described with reference to FIGS.

  First, as shown in FIG. 6, the inner cylinder 2 is moved forward. Specifically, after the outrigger 31 is retracted and retracted radially inward, all the slide jacks 24 of the first outer cylinder 41 to the third outer cylinder 43 are retracted substantially simultaneously, and the inner cylinder 2 is pushed forward. . Thereby, the inner cylinder 2 is moved forward by one segment, and then the outrigger 31 is extended and pushed out again to press the inner wall surface of the digging hole.

  When the inner cylinder 2 moves forward, all the gripper jacks 15 of the third outer cylinder 43 are extended from the first outer cylinder 41, and the existing segments 3 are pressed by the receiving seats 16. Take propulsion reaction force.

  Next, as shown in FIG. 7, the first outer cylinder 41 is moved forward. Specifically, after the gripper jack 15 of the first outer cylinder 41 is retracted and the seat 16 of the first outer cylinder 41 is retracted inward, the slide jack 24 of the first outer cylinder 41 is extended. The first outer cylinder 41 is pushed forward. As a result, the first outer cylinder 41 is moved forward by one segment. Thereafter, the gripper jack 15 of the first outer cylinder 41 is extended again, the receiving seat 16 of the first outer cylinder 41 is pushed outward, and the newly assembled segment 3 is pressed.

  When the first outer cylinder 41 advances, the reaction force is applied to the existing segment 3 by the gripper jack 15 and the receiving seat 16 of the second outer cylinder 42 and the third outer cylinder 43.

  Next, the second outer cylinder 42 and the third outer cylinder 43 are sequentially advanced in the same manner as the advancement of the first outer cylinder 41 in FIG.

  That is, as shown in FIG. 8, after the gripper jack 15 of the second outer cylinder 42 is retracted and the seat 16 is retracted, the slide jack 24 of the second outer cylinder 42 is extended to extend the second outer cylinder 42. Extrude forward. After the movement of the second outer cylinder 42, the gripper jack 15 of the second outer cylinder 42 is extended again and the existing segment 3 is pressed by the seat 16.

  When the second outer cylinder 42 moves forward, the reaction force is applied to the segment 3 by the gripper jack 15 and the receiving seat 16 of the first outer cylinder 41 and the third outer cylinder 43.

  Next, as shown in FIG. 9, after the gripper jack 15 of the third outer cylinder 43 is retracted and the seat 16 is retracted, the slide jack 24 of the third outer cylinder 43 is extended to extend the third outer cylinder. 43 is pushed forward. After the movement of the third outer cylinder 43, the gripper jack 15 is extended again and the existing segment 3 is pressed by the seat 16.

  When the third outer cylinder 43 moves forward, the reaction force is applied to the segment 3 by the gripper jack 15 and the receiving seat 16 of the first outer cylinder 41 and the second outer cylinder 42.

  6 to 9, the self-propelled erector 1 moves forward by one segment as a whole. After that, returning to FIG. 5 again, segment assembly and concrete spraying on the back of the segment are performed.

  As described above, the self-propelled erector 1 of the present embodiment can assemble a segment by self-propelling a digging hole, thereby enabling any segment in a machined digging or blasting excavation such as a NATM method. Segment assembly can be performed.

  As a result, without using a shield machine, it is possible to easily and quickly construct a watertight (water stop structure) by a segment in a digging hole.

  Furthermore, since the erector main body 6 is supported by a double cylinder structure including the inner cylinder 2 and the outer cylinder 41-43, the invert pier can be installed by inserting the transport passage 8 of the inner cylinder 2 on the face side. The discharged excavated soil can be easily transported to the wellhead side.

  Moreover, since the self-propelled erector 1 is self-propelled by the combination of the gripper jack 15 and the slide jack 24, the self-propelled erector 1 can move without laying rails or the like in the digging hole. This is particularly advantageous when the erector becomes larger and heavier when constructing a large-diameter tunnel.

  Further, the gripper jack 15 can both hold the circle of the segment 3 and ensure the propulsion reaction force.

  In addition, this invention is not limited to the above-mentioned embodiment, Various modifications and application examples can be considered.

  For example, the number of outer cylinders is not limited to three, and may be two or four or more.

FIG. 1 is a schematic view of a self-propelled erector according to an embodiment of the present invention. 2 is a cross-sectional view taken along line II-II in FIG. 3 is a cross-sectional view taken along line III-III in FIG. FIG. 4 is an enlarged view of a portion IV in FIG. FIG. 5 is a diagram for explaining a self-propelled method of the self-propelled erector of the present embodiment, and shows a state during segment assembly and concrete spraying. Drawing 6 is a figure for explaining the self-propelled method of the self-propelled erector of this embodiment, and shows the state where the inner cylinder was advanced. Drawing 7 is a figure for explaining the self-propelled method of the self-propelled erector of this embodiment, and shows the state where the 1st outer cylinder was advanced. FIG. 8 is a view for explaining the self-propelled method of the self-propelled erector of the present embodiment, and shows a state in which the second outer cylinder is advanced. FIG. 9 is a view for explaining a self-propelled method of the self-propelled erector of the present embodiment, and shows a state in which the third outer cylinder is advanced.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Self-propelled erector 2 Inner cylinder 3 Segment 5 (24) Slide means (slide jack)
6 Elector body 7 Gripper means 8 Conveyance path 15 Gripper jack 16 Seat 41-43 Outer cylinder

Claims (7)

In a self-propelled erector that self-propels in a burrow and assembles a segment in the burrow,
An erector main body for assembling the segments, an inner cylinder for supporting the erector main body, a plurality of outer cylinders slidably fitted in the front-rear direction on the outer periphery of the inner cylinder, and an outer periphery of each outer cylinder Gripper means projecting outward to the existing segment, pressing the existing segment, and retracting inward; slide means for relatively moving or fixing each outer cylinder and the inner cylinder in the front-rear direction; A self-propelled erector comprising a conveyance passage formed in the inner cylinder and inserted through the inner cylinder in the front-rear direction.   The self-propelled erector according to claim 1, wherein the gripper means has a seat abutting on the existing segment and a gripper jack for pressing the seat against the existing segment.   The self-propelled erector according to claim 1 or 2, wherein the slide means comprises a slide jack that is fixed to the inner cylinder and each outer cylinder and is extendable in the front-rear direction.   The self-propelled erector according to any one of claims 1 to 3, wherein an invert pier for conveying excavated soil from the face side to the wellhead side is provided in the transport passage in the front-rear direction in the digging hole.   A hoist for supplying a segment to the erector main body is provided, and a notch groove extending in the front-rear direction is formed in the lower part of the inner cylinder and the outer cylinder so that the hoist can be moved in the front-rear direction. 4. The self-propelled erector according to any one of the above. A tunnel construction method comprising assembling a segment with a self-propelled erector according to any one of claims 1 to 5 in a desired water stop section of a digging hole.   The tunnel construction method according to claim 6, wherein concrete is sprayed on a back surface of the assembled segment to fix the segment.

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