JP4896834B2 - Invert pier with excavator - Google Patents

Description

  The present invention relates to an invert pier with an excavator.

Invert is a tunnel floor and is usually formed by a loose curved surface.
This invert concrete placement work requires the work of finishing excavation of the floor of the aisle, installing the formwork, and placing concrete, and various devices have been developed and used.
JP 2001-173386 A. JP2003-82959A. JP-A-2005-171549.

The conventional moving jetty for invert as described above has the following problems.
<1> The invert part is a construction passage. At the time of the invert work, vehicles for many purposes such as unloading excavation from the back face and carrying materials used for support and spraying are still running.
<2> In that passage, the invert finish excavation, formwork installation, and concrete placement work will be performed. When the tunnel cross section is large, it will be divided from the center to the left and right, and the vehicle will stop halfway. The method of doing is generally adopted.
<3> On the other hand, when the tunnel cross-section is small and the vehicle cannot be secured, the pier arranged in the axial direction of the tunnel is routed before and after the floor of the construction part, and various operations are performed under the pier. The method of doing is adopted.
<4> When the cross section of the tunnel is small in this way, manual work in a narrow space under the Invert Pier was the center, and workability and efficiency were extremely poor. In that case, it was necessary to move the jetty to the left and right of the cross section of the tunnel every cycle, which required a long construction period.
<5> A similar problem occurs when the cross section of an existing tunnel is widened. Excavation of inverts and placement of concrete while maintaining the traffic of the existing tunnel were poor in workability. .

In order to solve the above problems, the invert pier with an excavator according to the present invention is an apparatus for excavating an invert part of a tunnel, and is a passage part in which a floor plate is provided in a vertical girder arranged in the tunnel axial direction. And a traveling device 11 attached to the lower surface of the passage portion, a vertical movement frame that can move in the axial direction of the tunnel at a position below the floor of the passage portion along the vertical girder of the passage portion, and along the vertical movement frame The horizontal movement frame is movable in the tunnel crossing direction, and the swing excavator is attached to the horizontal movement frame and can excavate under the floor of the passage.

Since the invert pier with an excavator of the present invention is as described above, the following effects can be obtained.
<1> Even in a tunnel having a small cross section, invert excavation, formwork placement, and concrete placement can be performed efficiently while ensuring the passage of various vehicles.
<2> Even if the invert pier is not moved left and right, it is possible to construct the entire cross section of the invert from the side wall to the side wall, thereby shortening the construction period.
<3> When used for widening existing tunnels, invert excavation, formwork installation, and concrete placement can be performed while securing traffic for general vehicles.
<4> The swing excavator is attached to a horizontal movement frame that moves along a vertical movement frame that has substantially the same curvature as the curved surface of Invert. Since the invert part is excavated by this excavator, the excavation boom can be easily controlled and the excavation accuracy can be improved as compared with the conventional apparatus.

  DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

<1> Overall configuration.
The present invention is an apparatus for excavating an invert portion while allowing passage in a tunnel.
The apparatus includes a passage portion 1 through which vehicles and people pass, a vertical movement frame 2, a horizontal movement frame 3, and a swing excavator 4.

<2> Passage part 1.
The passage portion 1 is a rectangular frame body in which a floor board is attached to a stringer 12 arranged in the tunnel axial direction.
The width of the passage portion 1 is not less than half of the cross-sectional width of the tunnel and not more than the cross-sectional width, and has a sufficient width for passage of the vehicle.
A ramp 6 is attached to the front and rear of the passage portion 1 in the axial direction so that a vehicle or a person can reach the lower position again through the high passage portion 1 from a lower position.
A traveling device 11 composed of wheels and an endless track is attached to the front and rear lower surfaces of the passage portion 1 in the tunnel axis direction.
For the sake of understanding, FIG. 1 planarly shows a state in which the floor plate of the passage portion 1 and the beams arranged vertically and horizontally between the vertical beams 12 are removed.

<3> Vertical movement frame 2.
A vertical movement frame 2 that can move in the axial direction of the tunnel along the longitudinal girder 12 of the passage portion 1 is attached to a position below the floor of the passage portion 1.
That is, as shown in the longitudinal view of FIG. 2, the vertical movement frame 2 is a frame body that is supported by the vertical beam 12 and can move in the tunnel axis direction. 12 and the passage portion 1 are not supported.
This vertical movement frame 2 is assembled by front and rear frames in a direction crossing the tunnel axis, and a tunnel axial frame that connects the frames.
Further, the vertical movement frame 2 is configured as a curved frame having substantially the same curvature as the inverted curved surface.
The width of the longitudinal movement frame 2 is larger than the width of the passage portion 1 and reaches near both ends in the tunnel crossing direction, that is, near the wall surface. Therefore, in plan view, both ends of the longitudinal movement frame 2 are outside the passage portion 1. Exposed.
The longitudinal movement frame 2 is moved in the axial direction of the tunnel by, for example, attaching a chain to a gear attached to the front and rear of the stringer 12, fixing the end of the chain to the vertical movement frame 2, and rotating the gear. be able to.
The vertical movement frame 2 is not directly attached to the vertical girder 12 of the passage portion 1, but is attached to a slide guide 22 such as a steel pipe provided outside the vertical frame in parallel with the vertical frame, and the tunnel guide is used as the guide. It is possible to move in the direction.
Since the excavation reaction force of the swing excavator 4 to be described later acts on the vertical movement frame 2, telescopic legs 21 that can be expanded and contracted in the vertical direction are attached to both ends of the vertical movement frame 2, and the elastic legs 21 are extended. It can be installed on the ground of the invert part.

<4> Horizontal movement frame 3.
A horizontal movement frame 3 capable of moving in the tunnel crossing direction is attached to the vertical movement frame 2 located below the floor of the passage portion 1.
The lateral movement frame 3 is a solid frame for mounting a swing excavator 4 described later and receiving the excavation reaction force.
For the movement of the lateral movement frame 3, wheels and gears such as the lateral movement gear 31 provided on the lateral movement frame 3 are mounted on the longitudinal frame in the axial direction of the tunnel of the longitudinal movement frame 2, and the wheels and gears The horizontal movement frame 3 can be slid in the transverse direction along the vertical movement frame 2 by rotation.
Since both ends of the vertical movement frame 2 to which the horizontal movement frame 3 is attached reach the wall surface of the tunnel, the horizontal movement frame 3 can also move to a position near the wall surface.

<5> Swing excavator 4.
A swing excavator 4 is attached to the lateral movement frame 3.
After the lateral movement frame 3 itself is located under the floor of the passage portion 1, the swing excavator 4 is also located under the floor of the passage portion 1, and excavation of the invert portion under the floor is possible.
At the tip of the swing excavator 4, a bucket for excavating earth and sand, an excavating drum with protruding excavating teeth, or a breaker for crushing rocks are provided.
The swing excavator 4 can swing in the tunnel transverse direction in plan view.
The swing excavator 4 can swing in the vertical direction when viewed from the side.
Since the horizontal movement frame 3 to which the swing excavator 4 is attached can move along the vertical movement frame 2 to near both ends in the tunnel transverse direction, the excavation range by the swing excavator 4 is the entire invert portion of the tunnel. Can cover the excavation range.

<6> Invert form 5.
An invert form 5 can also be attached below the passage portion 1.
This attachment position is behind the position of the vertical movement frame 2, that is, opposite to the position of the swing excavator 4.
By suspending the invert mold 5 under the passage portion 1, the invert mold 5 can be moved as the passage portion 1 moves.
The invert form 5 is a form having a shape along the shape of the surface of the invert, and the invert concrete can be placed by flowing the concrete into the lower part thereof.

<7> Description of use state.
During tunnel construction, Invert generally digs forward while leaving some thickness.
Then, the remaining finishing excavation is performed at the time of finishing, and invert concrete having a normal thickness is placed on the gravel layer or the like to complete.
The invert pier with an excavator of the present invention is a passage installed between such an unfinished portion and a portion completed by placing invert concrete, as shown in FIG.
That is, the traveling device 11 ahead of the pier is located in an unfinished portion, and the rear traveling device 11 is located on the completed invert concrete.
Since the ramp 6 is located in front of and behind each traveling device 11, a vehicle or a person can pass through the ramp 6 and the passage portion 1.
Under the passage portion 1 through which vehicles and people pass, the vertical movement frame 2 moves in the axial direction of the tunnel, the horizontal movement frame 3 moves along the vertical movement frame 2 in the tunnel transverse direction, and the horizontal movement frame 3. The swing excavator 4 mounted on the head continuously excavates the difference between the unfinished portion and the regular excavation position.
The excavated gap is scooped up by a backhoe or the like located in front of the passage, mounted on a truck or a belt conveyor, passed through the passage portion 1 and transported toward the wellhead.
Inverted formwork 5 is used to finish the finished excavation and concrete is completed.
When the longitudinal movement frame 2 moves forward to the front end, the vertical movement frame 2 is moved backward, the ramp 6 is lifted, and the entire passage unit 1 is moved forward using the traveling device 11.
By repeating the above operation, invert concrete is placed for the entire tunnel while allowing traffic in the passage portion 1.
The same can be done for widening an existing tunnel.

The top view of the Example of the invert pier with an excavator of this invention. The side view. FIG.

Explanation of symbols

1: Passage section 2: Vertical movement frame 3: Horizontal movement frame 4: Swing excavator 5: Invert formwork

Claims (3)

An apparatus for excavating an invert part of a tunnel,
A passage portion provided with a floor board in a vertical girder arranged in the axial direction of the tunnel,
A traveling device attached to the lower surface of the passage,
A longitudinal movement frame that can move in the axial direction of the tunnel at a position below the floor of the passage portion along the longitudinal girder of the passage portion;
A horizontal movement frame that can move in the tunnel crossing direction along the vertical movement frame,
A swing excavator that can be attached to a lateral movement frame and excavate under the floor of the passage section;
Made up of,
Invert pier with excavator. The vertical movement frame is
A curved frame with almost the same curvature as the curved surface of Invert.
The invert pier with an excavator according to claim 1. The vertical movement frame is
It is movable in the tunnel axis direction along the vertical axis provided in the vertical girder of the passage part,
The invert pier with an excavator according to claim 1.

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