JPH0459402B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method for installing wires at the top of a tower when constructing a suspension bridge.

Conventional technology When installing parallel wire strands (PWS) at the top of towers such as suspension bridges and cable-stayed bridges, the methods shown in Figure 6,
As shown in FIG. 7, a pulley 03 is attached to the top of a dowel 02 provided at the top of the main tower 01, and a pulley roller 05 is placed on a cat walk 04.
Place parallel wire strand 06 on. Tie the rope 07 to point a on the wire strand 06,
The rope 07 is wound around the winch 08 via the pulley 03. Another rope 09 is tied to point a, and the rope 09 is gripped by hand or by a winch 011 via a pulley 010 provided on the cat walk 04.

When the winch 08 is wound and the rope 07 is pulled (called a temporary pull), point a moves upward to point b, so
The rope 09 is pulled, point b is moved to point c, and the parallel wire strand 06 is placed in a predetermined position within the saddle 012.

Assuming that the parallel wire strands corresponding to points a, b, and c are respectively 06-a, 06-b, and 06-c, in FIG. −
b, and then pulled down by the rope 09 and stored at a predetermined position 06-c in the saddle 012.

Problems to be solved by the invention Parallel wire strand 06-a is connected to rope 0
7, connecting point a of rope 07 and pulley 03
Since the two-dimensional position of the wire strand 06 is shifted, the wire strand 06 moves laterally as the point a moves toward the point b, and swings greatly. The rope 09 prevents the lateral movement from swinging, the rope 09 is pulled by human power or a winch 011, and the wire strand 06 is accommodated in the saddle 012.

During such work, there was a risk that the wire strands would sway significantly, causing damage to other members by coming into contact with them, or that the worker would be thrown off by the rope.

Measures to solve the problem Support the pulley at the top of the dowel so that it can move laterally, temporarily pull the parallel wire strand directly above the leader line, move the wire strand laterally to a predetermined position after the temporary pull, and then At this point, the temporary pull rope is loosened to accommodate the wire strand in place within the saddle.

Function A pulley is placed directly above the parallel wire strand, and temporary pulling is performed without causing the wire strand to sway in the lateral direction. The wire strand is moved to a predetermined position in the lateral direction and housed in the saddle without relying on human power by the lateral movement of a pulley on the upper part of the dowel.

Embodiment In FIGS. 1 to 5, a lateral movement device 3 is attached to the top of a tower 2 provided at the top of the main tower 1, and a pulley 3 is mounted on a movement frame 31 of the lateral movement device 3.
Install 2.

A parallel wire strand 6 is placed on a drawing roller 5 placed on a cat walk 4.

A rope 7 is tied to a point d on the parallel wire strand 6, and the rope 7 is wound around the winch 8 via a pulley 32.

After moving the moving frame 31 of the lateral moving device 3 and positioning the pulley 32 above the wire strand 6, the winch 8 is wound and the wire strand 6 is lifted by the rope 7 (point d moves to the upper point e) ), then move the moving frame 31 and pulley 32 laterally so that the wire strand 6 is in a predetermined position (point e moves to point f in the lateral direction). When the rope 7 is loosened in this state, the wire strand 6 descends (point f moves downward to point g) and is accommodated in a predetermined position within the saddle 12.

Parallel wire strands 6 corresponding to points d, e, f, and g are connected to 6-d, 6-e, and 6-, respectively.
f, 6-g, in FIG. 2, the wire strand 6-d being drawn out is pulled up by the rope 7 and moves to 6-e, and due to the lateral movement of the pulley 32, the wire strand 6-e moves to 6-f. , and then by loosening the rope 7, the wire strand 6-f is lowered to a predetermined position 6-f in the saddle 12.
It is accommodated in g.

Next, the specific structure of the lateral movement device 3 will be explained.
In FIGS. 3, 4, and 5, a movable frame 31 is supported by a rotating frame 30 supported substantially horizontally by a pedestal 40. As shown in FIG. The rotating frame 30 has longitudinal guides 33 and the moving frame 31
can move horizontally on the rotating frame 30 while keeping the wheels 34 in contact with the guide 33.

In order to move the moving frame 31, the moving frame is provided with a nut 35, which is connected to the rotating frame 3.
0 is provided with a feed screw 36 that engages with the nut 35 and a lateral movement motor 37 that rotates the feed screw 36.

A pulley attachment piece 38 is protruded from the surface of the movable frame 31 facing the wheels 34, and the pulley 32 is pivotally attached to the pulley attachment piece 38. The rotating frame 30 is rotatably supported around a horizontal axis by a pedestal 40, but a rotatable angle θ is limited by a stopper 39. Therefore, the movable frame 31 can rotate together with the rotary frame 30 around the horizontal axis within the rotatable angle θ.

In such a device, as shown in FIG. 1, the entire lateral movement device 3 is fixed to the upper part of the goggle 2, and the lateral movement motor 37, Feed screw 3
6. The nut 35 moves the pulley 32 to the desired horizontal position, that is, the parallel wire strand 6-
It can be moved from above d, 6-e to above 6-f, 6-g.

Effects of the Invention When the parallel wire strand at the pull-out position is temporarily pulled with a rope, the pulley is placed above the parallel wire strand and the pulley is temporarily pulled, so that the wire strand does not sway.

Next, a motor and a feed screw are used to move the pulled wire strand to a desired position in the lateral direction, so this can be done safely and accurately without causing misalignment.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of an embodiment of the method for installing the suspension bridge wire at the tower top of the present invention, FIG. 2 is an elevational view of the tower top shown in FIG. 1, and FIG. 3 is a plan view of the lateral movement device shown in FIG. 1. Fourth
The figure is an elevational view of FIG. 3, and FIG. 5 is a sectional view taken along line AA of FIG. 4. Figure 6 is a schematic diagram showing the conventional method.
FIG. 7 is an elevational view of the tower top of FIG. 6. 1... Main tower, 2... Yagura, 3... Lateral movement device, 31... Moving frame, 32... Pulley, 4...
... Cat walk, 6 ... Parallel wire strand, 7 ... Rope, 8 ... Winch, 12 ...
…saddle.

Claims (1)

[Claims] 1. A lateral movement device that supports a pulley in a horizontally movable manner is attached to the top of a tower provided at the top of the main tower, and a rope connected to the pulled out parallel wire strand is wound around a winch via the pulley, The rope lifts the parallel wire strand with the pulley directly above the parallel wire strand, moves the pulley and the parallel wire strand suspended from the pulley to a desired position in the lateral direction, and then lifts the rope. A method for installing suspension bridge wire at a tower top, characterized in that the parallel wire strand is accommodated at a desired position in a saddle by loosening the wire.