JP3026544B2 - Method and apparatus for moving overhanging work vehicle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for moving an overhanging work vehicle for overhanging a prestressed concrete bridge having a curved linear shape.

[0002]

2. Description of the Related Art In the overhang block method, a cantilevered overhanging work vehicle is used, and the bridge body blocks are alternately overhanged while the load of the bridge body is balanced right and left from the pier by a jigging system. Build a bridge. That is, 3 ~ in the bridge axis direction
The bridge body, which is divided into lengths of about 5 m, is stretched alternately to extend the bridge body, while keeping the balance in order from side to side.

[0003] The overhang block construction method in which the bridge body blocks are sequentially overhanged and the bridge body is extended is characterized in that the construction of a bridge with a long span can be easily performed and the bridge is not restricted by the space condition under the girder. Yes, widely used. For the overhang work vehicle, the movable rail is temporarily fixed on the existing bridge block, and the work vehicle is mounted on the rail so that it can move forward and backward, and the formwork and scaffolds are steel rods etc. from this work vehicle In this way, the bridge is suspended and supported, the rebar is assembled, concrete is poured into the formwork, and the bridge blocks are sequentially constructed and extended.
That is, this method prepares the next block, releases the temporary fixing of the rail, advances the rail to the next block construction position, temporarily fixes again, and repeatedly advances the work vehicle to the next block construction position. This is a method of constructing a bridge block and extending the bridge.

[0004]

If the horizontal alignment of the bridge is a straight line, the bridge can be constructed without displacement by simply moving one by one by the block length. When entering, the rail is straight, so that when the rail is moved forward, it is shifted from the axis.
In the case where the plane figure is a curve having a single curvature such as a circular curve, it is possible to cope with this by using a rail which has been previously bent in accordance with the curvature. However, such rails are difficult to convert to other uses, and are not economical in view of processing costs and the like. Further, it becomes more and more difficult when the curve shape is an S-shaped curve or a clothoid curve. For this reason, it is necessary to jack up rails that are off the axis with a jack or the like, and perform a work of swinging back the axis.

SUMMARY OF THE INVENTION The present invention is directed to an improved overhanging erection so that the position of the rail can be easily changed when the work vehicle for overhanging the overhanging construction method of the overhanging block method on a bridge having a curved horizontal alignment can be easily moved. An object of the present invention is to provide a method and a device for moving a work vehicle.

[0006]

SUMMARY OF THE INVENTION According to the present invention, a support member for supporting a rear portion of a rail from above in a laterally movable manner when an overhang work vehicle is moved by an overhang block construction method for a bridge having a curved planar alignment. This is a method for moving an overhanging work vehicle, which is prepared on a bridge body, and laterally moves and positions the rear portion of the rail until the rail axis coincides with the next block construction reference line.

[0007] The apparatus of the present invention, which can suitably carry out the above method, comprises a gate-type slide frame for receiving an upper surface of a rail for moving a construction vehicle, a lower surface of a beam of the gate-type slide frame, and an upper surface of the transfer rail. And a low-friction material interposed therebetween.
In this case, a fluororesin sheet is preferably used as the low friction material, and a roller or a ball may be used.

[0008]

[Function] The overhang block construction method is a method of constructing a bridge by erection and erection of blocks from left and right in the direction of the bridge axis from the pier, and overhangs the existing bridge body to construct the block. Use a construction vehicle. In such an overhang block construction method, the overhang work vehicle is moved forward each time one block is overhanged.

FIG. 9 is a side view of the overhanging work vehicle 1 for constructing a block. The rail 6 is laid on the existing bridge body 50, and the overhanging work vehicle 1 is mounted on the rail 6 for use. The overhanging work vehicle 1 has a quadrilateral main frame 3.
A steel beam 7 is suspended from the beam 2, a form support member 51 and a form 52 of the next block are attached to the steel bar 7, and working suspension scaffolds 53 and 54 are attached to the steel bar 7. Provided,
Concrete is poured into the formwork 52. The rear portion of the main frame 3 rests on the rail 6 and is provided with a reaction force support device 20 at the tail end so that the main frame 3 is engaged with the rail 6 to support the reaction force of concrete.

According to the present invention, when a bridge having a curved surface such as an S-shaped curve or a clothoid curve is erected by the overhang block method, the tail end of the rail can be slid in the lateral direction. The bridge whose plane curve is an arbitrary curve can be easily constructed. FIG. 8 is a plan view of a bridge body whose horizontal alignment is a curve. Existing bridge block 50
The situation where the rail 6 is relocated in order to construct the bridge block 50e in front of b, 50c, 50d is illustrated.

In the present invention, a gate-shaped slide frame 10 is prepared on an existing bridge as a support member for supporting the rail 6 from above so as to be able to move laterally. The support member is a portal slide frame that receives the upper surface of the rail, and the present invention provides an overhanging structure including a low friction material sandwiched between the lower surface of the beam of the portal slide structure and the upper surface of the rail. It is a moving device of a working vehicle. In this case, it is preferable to use a fluororesin sheet (trade name: Teflon) or the like as the low friction material. Further, a roller or a ball may be used as the low friction material.

[0012]

1 to 3 show an overhanging work vehicle 1 according to an embodiment of the present invention. FIG. 1 shows a front view of a portion where a form support member 51 of the overhanging work vehicle 1 is suspended in a right half, and a left half shows a front view of a portion of a gate-type slide frame 10 (support member). . FIG. 3 is an enlarged view of the portal slide frame 10. FIG. 2 shows a portion where the form support member 51 of the overhanging work vehicle 1 is suspended in the right half, and a rear anchor (reaction force support device 20) on the overhanging work vehicle 1 in the left half.
The main frame 3 has wheels 5 running on rails 6 and rollers for supporting a floating force on the lower surface of the upper flange of the rails 6. Further, a jack 4 for lifting the main frame 3 is provided. A reaction force support device 20 is provided at the tail end of the main frame 3 of the overhanging work vehicle 1, and a roller 22 attached to the frame 21 is engaged with a lower surface of an upper flange of the rail 6. The jack 24 connected to the steel bar 23 supports the levitation force of the frame 21.

In the present invention, a gate-type slide frame 10 is provided as a support member for supporting the floating force of the tail end of the rail 6. The portal-type slide frame 10 has a portal shape including beams 11 and legs 12, is mounted on the existing bridge block 50, and is fixed to the existing bridge block 50 by the anchor steel rod 13.
Sliding member 1 having low friction member 14 interposed on the lower surface of beam 11
5 and the upper surface of the rail 6 is
Slides on the lower surface of the beam 11 and moves laterally as indicated by an arrow 18.

An example in which the present invention is applied to the following curved bridge will be described below. Bridge length: 85m Width: 8.0m Block length: 3.0-3.5m Plane radius of curvature: 60m minimum (clothoid curve) Shift amount: 5cm (maximum per block) Movement of the overhanging work vehicle 1 This will be described with reference to FIGS.

FIG. 4 shows the existing bridge blocks 50a, 50b,
A rail 6 is laid on 50c and the overhanging work vehicle 1 is fixed thereon, and the cross beam 2 on the frame 3 of the overhanging work vehicle 1 is fixed.
This shows a situation in which a steel bar 7 is suspended from above to support the form support material 51, and concrete for the next block 50d is cast. At this time, the reaction force support device 2 at the tail end of the overhanging work vehicle 1
0 is fixed in the en mosquitoes steel rod into the existing bridge body block 50b, portal slide Frames 10 is the top tail position of the rail 6 is fixed to Hashitai block 50a.

FIG. 5 shows a stage in which the concrete casting is completed in this state and the overhanging work vehicle 1 is moved forward. In FIG. 5, the gate-type slide frame 10 located at the tail of the rail 6 is moved to a position adjacent to the tail end of the erection work vehicle 1 and fixed to the existing bridge block 50b with an anchor steel bar. Next, the procedure moves to the step of FIG. Main frame 3 of overhang work vehicle 1
The lower jack 4 (see FIG. 1) is extended, and a reaction force is applied to the existing bridge block 50c to lift the overhanging work vehicle 1.
Then, while releasing the temporary fixation of the rail 6 to the bridge,
The connection between the tail end of the erection work vehicle 1 and the anchor steel rod of the reaction force support device 20 is loosened. As a result, a pulling force due to the overturning moment of the overhanging work vehicle 1 is generated in an intermediate portion of the rail 6,
The rail 6 moving roller 22 (see FIG. 2) hanging from the tail frame 21 (see FIG. 2) of the main frame 3 pushes up the lower surface of the upper flange of the rail 6 and lifts the rail 6. Accordingly, the upper surface of the rail 6 is
Abuts a sliding member 15 having a Teflon sheet as a low friction member 14 under the beam 11 of FIG.

With the jack 4 below the main frame 3 on the inner circumference side of the bridge axis as a reference point, the tail end of the rail 6 is moved outward in the direction orthogonal to the bridge axis until the axis of the rail 6 coincides with the reference line when constructing the next block. Slide (see FIG. 8). The reaction force support device 20 of the overhanging work vehicle 1 is temporarily fixed to the anchor, and the rail 6
Is advanced to a predetermined position where the next bridge block is to be constructed (see FIG. 8).

The jack 4 of the overhanging work vehicle 1 is contracted, and the main frame 3 is moved to the work vehicle moving wheels 5 (see FIG. 1).
7 and when the rail 6 which has been advanced to the existing bridge block 50d is advanced to the next block construction position, FIG.
The state shown in FIG. Then, the tail end of the rail 6 is again moved in the lateral direction, and the positioning of the form (not shown) suspended from the erection work vehicle 1 is performed. At this time, the tail end of the rail 6 is in contact with the lower surface of the beam of the portal slide frame 10.

When the position adjustment of the formwork (not shown) is completed, the rail 6 is temporarily fixed, the anchor of the reaction force support device 20 at the tail of the overhanging work vehicle 1 is set, and the jack 4 below the main frame 3 is extended. After fixing, prepare for the construction of the next bridge block, such as the next set of bridge block formwork.
At this time, it has returned to the state of FIG. The above work is repeated to build a bridge.

In the above example, a Teflon sheet was used as a low friction member on the sliding surface of the gate-type slide frame , but a low friction member such as a roller or a steel ball having a small friction coefficient was used. It works well even if it is interposed.

[0021]

According to the method of the present invention, it is not necessary to laterally bend the rails, and it is possible to construct bridges having any plane curve alignment using a simple portal slide frame. In addition, the portal slide structure of the present invention is versatile and versatile.

[Brief description of the drawings]

FIG. 1 shows the overhanging erection work vehicle of the embodiment, the front view of the right half of the main frame, the left half is a front view of the portal slide Frames.

FIG. 2 shows the overhang work vehicle of the embodiment, the right half is a front view of a main frame, and the left half is a front view of a reaction force support device.

FIG. 3 is an enlarged front view of a portal slide frame.

FIG. 4 is an explanatory view showing the steps of the embodiment.

FIG. 5 is an explanatory view showing the steps of the embodiment.

FIG. 6 is an explanatory diagram showing the steps of the example.

FIG. 7 is an explanatory view showing the steps of the embodiment.

FIG. 8 is a plan view in which a horizontal alignment is a curve.

FIG. 9 is an explanatory view of an overhang work vehicle.

[Explanation of symbols]

REFERENCE SIGNS LIST 1 construction work vehicle 2 cross beam 3 main frame 4 jack 5 wheel 6 rail 7 steel rod 10 portal slide frame (supporting member) 11 beam 12 leg 13 steel rod 14 low friction member 15 sliding member 20 reaction force support device 21 frame 22 Roller 23 Steel rod 50 (50a, 50b, 50c, 50d, 50e) Bridge block 51 Form support 52 Form 53, 54 Scaffold

Claims (4)

(57) [Claims] 1. A support member for supporting a rear portion of a rail from the upper side so as to be able to move laterally so as to be movable on an existing bridge body when moving an overhanging work vehicle in an overhang block method of a bridge having a curved linear shape. A method for moving an overhanging work vehicle, comprising: laterally moving a rear portion of a rail until an axis coincides with a reference line for constructing a next block; 2. A portal slide frame fixed to a bridge body is provided at a rear portion of a rail for moving an installation work vehicle, and a low friction material is sandwiched between a lower surface of a beam of the portal slide frame and an upper surface of the rail for transportation. A moving device for an overhang work vehicle. 3. The moving device for an overhanging work vehicle according to claim 2, wherein the low friction material is a fluororesin sheet. 4. The moving device for an overhanging work vehicle according to claim 2, wherein the low friction material is a roller or a ball.