JP3648048B2 - Mobile jetty - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a mobile pier, and more particularly to a mobile pier used for invert construction of a tunnel.
[0002]
[Prior art]
Conventionally, it is known to use a mobile pier 1 as shown in FIG. 6 in order to pass a work vehicle carrying out the shear from the face when performing invert construction in tunnel construction. In the figure, reference numeral 2 denotes a frame for traveling the vehicle, and a wheel 3 and a jack 4 for advancing and retreating are attached to the lower part of the frame 2, and the front and rear of the frame 2 (the left side in the figure is the forward direction, That is, the inclined plate 5 is provided on the face side.
[0003]
The mobile pier 1 is installed on one side of the tunnel, and the side of the gantry 2, that is, the other side of the tunnel is inverted. Then, after the construction on the other side of the tunnel is completed, the movable jetty 1 is moved laterally to the other side of the tunnel, and one side of the tunnel is inverted. During this time, the work vehicle moves up the inclined plate 5 and travels on the upper surface of the gantry 2.
[0004]
In order to move the movable pier 1 laterally, first, the front and rear lifting cylinders 6 are contracted to lift the tip of the inclined plate 5, and the jack 4 is extended to extend the gantry 2 as shown in FIG. To rise. Then, in a state where the wheel 3 is levitated from the ground, the traverse cylinder 7 is contracted and the wheel frame 8 is traversed as shown in FIG.
[0005]
Subsequently, as shown in FIG. 7 (c), the jack 4 is contracted to lower the gantry 2, and the wheel 3 is grounded to the ground. If the traversing cylinder 7 is extended in such a state, the gantry 2 traverses and is drawn to the upper part of the wheel frame 8 as shown in FIG. By repeating the operations shown in FIGS. 7A to 7D, the movable jetty 1 moves laterally from one side of the tunnel to the other side or from the other side to one side.
[0006]
[Problems to be solved by the invention]
However, it takes about 30 to 40 minutes to move the movable jetty while moving the wheel frame and the gantry alternately by the operation of the jack and the traversing cylinder, so the working efficiency is not good. Further, since the wheel frame and the gantry are in a shifted state, the stability is poor, and there is a slight danger when moving laterally. Furthermore, the manufacturing cost increases because the rigidity of the traversing portion is increased.
[0007]
Therefore, there is a technical problem to be solved in order to make it possible to easily and quickly laterally move a mobile jetty used mainly for invert construction of a tunnel, and the present invention solves this problem. With the goal.
[0008]
[Means for Solving the Problems]
The present invention has been proposed in order to achieve the above object, and a plurality of jacks are provided at a lower portion of a vehicle traveling base, and wheels for forward and backward advancement are attached to a lower end portion of the jack. A crawler for lateral movement is provided at the lower part of the frame, and a movable jetty is provided in which inclined plates installed between the upper surface of the gantry and the ground are attached to the front and rear of the gantry.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. In FIG. 1 to FIG. 3, reference numeral 11 denotes a mobile jetty used for invert construction of a tunnel, and the mobile jetty 11 is provided with a gantry 12 for traveling the vehicle. A plurality of jacks 13 are provided, and forward and backward wheels 14 a and 14 b are attached to the lower ends of the jacks 13. The jacks 13 are provided at least in the four corners of the lower part of the gantry 12, and the wheel 14 a on the face side (the left side in FIG. 1 is the face side, that is, the front direction) uses tires, and the wheel 14 b on the wellhead side uses iron wheels. Each wheel 14a, 14b has a strength capable of supporting its own weight.
[0010]
Further, a crawler 15 for lateral movement is provided at the lower part of the gantry 12. The crawler 15 is mounted sideways in the vicinity of the wheels 14a and 14b and is driven by a hydraulic motor. The figure shows the state of the movable pier 11 during invert excavation or invert concrete placement, the jack 13 is extended, the wheels 14a and 14b are grounded, the gantry 12 is raised, and the crawler 15 is grounded. It is far from.
[0011]
On the other hand, an inclined plate 16 installed between the upper surface of the gantry 12 and the ground is attached before and after the gantry 12, and the tip of the inclined plate 16 can be lifted by winding the wire rope 17. It is. Although not shown in the drawings, support columns are temporarily provided at lower portions of the gantry 12 and the inclined plate 16 as reinforcing materials when the vehicle passes.
[0012]
The movable jetty 11 is installed on one side of the tunnel, and inverts the side of the gantry 12, that is, the other side of the tunnel. During this time, the work vehicle travels up the one inclined plate 16 and travels on the upper surface of the gantry 12 and descends from the opposite inclined plate 16, thereby obstructing the passage of the work vehicle even during invert construction. There is no. Then, after the construction on the other side of the tunnel is completed, the movable jetty 11 is moved laterally to the other side of the tunnel, and one side of the tunnel is inverted.
[0013]
In order to move the movable pier 11 laterally, as shown in FIGS. 4 and 5, the jack 13 is contracted and the pedestal 12 is lowered, whereby the crawler 15 is grounded and the wheels 14a and 14b are moved from the ground. Surface. At this time, the weight of the gantry 12 is supported by the crawler 15. Before and after the grounding of the crawler 15, the wire rope 17 is wound up so that the tip of the inclined plate 16 is separated from the ground. If the crawler 15 is driven in such a state, the gantry 12 and the wheels 14a, 14b and the like move together, and the movable jetty 11 can be moved laterally to the other side of the tunnel.
[0014]
After the movable jetty 11 is moved to a predetermined position by driving the crawler 15, the jack 13 is extended again to ground the wheels 14a and 14b as shown in FIGS. 1 to 3, and the crawler 15 is grounded. The gantry 12 is raised to a position away from. Further, when the wire rope 17 is lowered and the tip of the inclined plate 16 is grounded to the ground, the movable pier 11 returns to the state at the time of invert construction, and the work vehicle can pass.
[0015]
In this way, since the movable jetty 11 can be easily moved laterally, a raw concrete can be driven using a chute from the gantry 12 at the time of invert construction, and a conventionally required concrete pump car is unnecessary. Become. In addition, since the movable jetty 11 can be moved laterally even while the live-con is being placed, it is possible to reduce the labor at the time of placing by placing directly below the gantry 12.
[0016]
It should be noted that the present invention can be variously modified without departing from the spirit of the present invention, and the present invention naturally extends to the modified ones.
[0017]
【The invention's effect】
As described above, the moving pier of the present invention is equipped with a wheel for forward and backward movement at the lower end of a jack provided at the lower part of the gantry and a crawler for lateral movement at the lower part of the gantry. When the jack is contracted, the crawler touches the ground and supports the frame, and the wheel rises from the ground. By driving the crawler in such a state, the moving jetty can be moved laterally simply and quickly. Therefore, the time for lateral movement is remarkably shortened and the working efficiency is improved.
[0018]
In addition, since the platform is supported by the crawler during lateral movement, the platform can be moved extremely stably even on uneven or soft ground, and the safety during lateral movement is high. Furthermore, since a general-purpose crawler can be used, the traversing portion can be formed at a low cost, and this can contribute to the cost reduction of the moving jetty.
[Brief description of the drawings]
FIG. 1 is a partially cutaway side view of a moving jetty during invert construction according to an embodiment of the present invention.
FIG. 2 is a side view of an essential part of a rear part of a moving jetty in FIG. 1;
3 is a view taken along the line AA in which the inclined plate of FIG. 2 is omitted.
FIG. 4 is a side view of an essential part of a rear part of a moving jetty during lateral movement.
FIG. 5 is a view taken along the line B-B in which the inclined plate of FIG. 4 is omitted.
FIG. 6 is a partially cutaway side view of a conventional moving jetty.
FIG. 7 is an explanatory diagram showing a lateral movement process of a conventional moving jetty at the position of line CC in FIG. 6;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 11 Mobile pier 12 Mount 13 Jack 14a, 14b Wheel 15 Crawler 16 Inclined board

Claims (1)

A plurality of jacks are provided at the lower part of the vehicle traveling base, and a wheel for forward and backward movement is attached to the lower end of the jack, and a crawler for lateral movement is provided at the lower part of the base. A movable jetty characterized in that inclined plates installed between the two are attached to the front and rear of the mount.

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