JPS5810522B2 - How to erect long objects in the air - Google Patents

Description

[Detailed Description of the Invention] The present invention is directed to the aerial construction of long objects such as ropes, cable strands, wires, twisted wires used for suspension bridges and overhead cableways, ropes for suspension scaffolding when constructing suspension bridges, electric wires, and various other cables. It is about the method.

Conventionally, when constructing long objects such as strands of cables for suspension bridges in the air, foundations 4 and 7 are provided at both ends of the cable installation site, and the foundations are Towers 5 and 6 are erected between 4° and 7, and an unreeler 8 is attached to one foundation 4, and a drive device 10 for rotating a drive wheel 9 attached to a vertical shaft is fixed, and the other foundation 4 is fixed. An end driven wheel 11 that rotates around a vertical axis is attached to 7, and each base 5
, 6 is attached with an intermediate driven wheel 13 that rotates about a horizontal axis. The upper parts of a number of carriers 14 having hooks at the lower ends are attached to the hauling rope 3 at intervals in the longitudinal direction of the rope, and each carrier 14 supports the strands 15, and the carrier 16 attached to the hauling rope 3 supports the strands. By grasping the front end of the strands 15 and driving the hauling rope 3 in the forward direction, that is, in the direction of arrow A, the strands 15 sent out from the unreeler 8 are supported by each carrier 14 and moved from one foundation 4 to the tower 5. .6 to the other foundation 7, and as shown in Fig. The ends of the strands 15 are gripped, and both sides of the towers of the strands 15 are gripped by clamps 22 attached to ropes 21 that are paid out from a plurality of winches 20 attached to the tops of the towers 5 and 6. Next, each winch 17, 20 is operated in the hoisting direction to temporarily pull the strands 15, thereby lifting the strands from the hooks of each carrier 14, and then lifting the strands onto the carrier 14 along the hauling rope 3. A longitudinal line 15' of a predetermined shape from the line
Then, both ends of the strands were fixed to the foundation 4°7.

However, in the case of the conventional method, the strands 15
It is necessary to use large-capacity winches, jacks, etc. that can overcome the tension caused by the free sagging of the cables, and when installing cables for a long suspension bridge, it is necessary to repeat the Maebara operation dozens or hundreds of times. However, there is a drawback that the preliminary drawing requires a great deal of effort and time.

The object of the present invention is to provide a method for constructing long objects in the air, which eliminates the above-mentioned drawbacks.

Next, the present invention will be explained in detail using illustrated examples.

Figures 4 to 10 show the present invention in a prefabricated parallel wire strand (which constitutes the cable of a long suspension bridge).
This is an example in which the track cable 23 is installed on the foundations 4, 7 and the tops of the towers 5, 6 provided at both ends and in the middle of the cable installation site. Attach the saddles 24 to 29 to be attached, and connect one end of the track cable 23 to a fixing device 30 fixed on the foundation 7, and wind the other end of the track cable 23 around a pulley 31 attached to the foundation 4, The counterweight 32 connected to the other end of the track cable 23 allows the truck to be moved.

Tension the Tsuku cable 23 with a constant tension, and further tighten the foundation 4.7.
and a catwalk (suspended scaffold made of wire rope, wire mesh, etc.) built across towers 5 and 6.
Gear rose frame saddles (intermediate support towers provided on the catwalk) 34 are mounted on the gear rose frame saddles 33 at appropriate intervals in the longitudinal direction, thereby supporting the track cable 23.

Further, an endless hauling rope 3 is attached to each saddle 24 to
Although it was installed on the side of 29, the guide roller 35 and foundations 4 and 7
Hauling rope drive device 38 installed on the foundation 4 and installed on the diverting sheave group 36, 37 supported by
This allows the hauling rope 3 to be driven substantially parallel to the track cable 23 in the forward and reverse directions.

5 and 6 show in detail the structure of the carrier 2 attached to the hauling rope 3 at regular intervals,
A grooved roller 1 supporting a strand 40 at the lower end of the hanging rod 39 is supported in a cantilevered manner by a support shaft 41 extending in the left-right direction, and a counterweight 42 is attached to the support shaft 41. The upper end of the hauling rope gripping device 43 is pivotally connected to the hauling rope gripping device 43 by a pin 44 extending in the left-right direction, and a track cable is attached to the front and rear portions of a support frame 45 that is connected to the top of the hauling rope gripping device 43. A grooved wheel 46 that runs on the grooved wheel 23 is attached, and the total weight of the carrier 2 configured in this way is equal to the grooved wheel 4
6 and supported by a track cable 23.

The carrier 2 is connected to the track cable 2 by the hauling rope 3.
3, and when the carrier 2 is not on the track cable, it is transported by a chain conveyor 48 with a retaining piece that is placed on a pull-in rail 47 constructed above the foundation 4 and moves parallel to the pull-in rail 47. be done.

Further, as the carrier receiving and discharging device between the lead-in rail 47 and the track cable 23, the same device as the carrier receiving and discharging device on a general cableway is used.

The hauling rope gripping device in the carrier 2 can be the same as that used for general cableways (passenger cableways, cargo cableways).

FIGS. 7 and 8 show an example of this. When the carrier 2, which is transported on the lead-in rail 47 by the chain conveyor 48, reaches the rope-leaving rail 49, the rail 4
9, the rope separation roller 50 in the hauling rope gripping device 43 is raised and the hauling rope gripping device 43 is lifted.
is released, and then the carrier 2 is transferred by the chain conveyor 48 in the direction in which the strand 40 is pulled out, and the carriage 2 is moved to the unroping rail 4.
Since the rope separation roller 50 falls at the same time as it is separated from the hauling rope 9, the hauling rope gripping device 43 closes and grips the hauling rope 3.

After the carrier 2 is fixed to the hauling rope 3 in this way, the carrier 2 is moved forward on the track cable 23 while being pulled by the hauling rope 3, and the carrier 2
When moves in the opposite direction to the direction of strand withdrawal,
If the pulling rail 47 is moved down parallel to the tip of the rope-leaving rail 49 so that the hauling rope grasping device 43 is separated from the hauling rope, when the rope-leaving roller 50 separates from the rope-leaving rail 49, the carrier 2 is holing rope 3
After that, the chain conveyor 48 transports the carrier 2.
is moved on the retraction rail 47.

When the carrier 2 passes over the guide rollers 35 on the sides of each of the saddles 24 to 29, the hauling rope grasping device 43 moves over the guide rollers while being fixed to the hauling rope 3, as shown in FIG. Moving.

At one point in the middle of the hauling rope 3 is a carrier 52 having grooved wheels 51 running on the track cable 23.
is fixed, and when pulling out the strand 40, the carrier 52 is moved by the hauling rope 3 to just before the support saddle 24 of the track cable 23, and the end socket 53 of the strand 40, which has been let out several meters from the unreeler 8, is pulled out.
It is connected to the carrier 52 via a connecting link 55 with a counterweight 54.

Next, the hauling rope 3 is driven by the hauling rope drive device 38, and at the same time the chain conveyor 48 is driven at a speed of one to several tenths of the speed of the hauling rope, so that the carrier 2 is moved on the pull-in rail 47 at an appropriate speed. Draw it out while suspending it at intervals.

The carrier 2 discharged from the pull-in rail 47 is attached to the gripping device 43
The strand 40, which is fixed to the hauling rope 3 by the hauling rope 3 and fed out from the unreeler 8, is placed on the track cable support saddle 24 so as to ride on the grooved roller 1 of the carrier 2.
The vehicle is transported at a sufficient fleet angle so that it is on the travel line of the carrier at a higher level than the grooved rollers 1 of the neighboring carriers 2.

In this way, the chain conveyor 48° hauling rope drive device 38. By driving the unreeler 8, the strand 40 can be pulled out between the foundations 4 and 7 while being suspended by the carrier 2.

After the above drawing operation is completed, the front end of the strand 40, which has been removed from the carrier 52 at the foundation 7, is temporarily fixed to the foundation 7 in front of the fixing section, as shown by the dotted line in FIG.

On the other hand, in the foundation 4, the rear end rope coming out of the unreeler 8 is left as it is without being removed; this rope is wound around the unreeler 8 during strand production.

Next, when the hauling rope drive device 38 is driven so that the hauling rope 3 moves in the opposite direction to the strand drawing operation, that is, in the reverse direction, each carriage 2 moves backward toward the foundation 4, and the grooved rollers in each carriage 2 move backward. 1 supports the strand 40 from below and moves while rotating, and each carrier 2 is sequentially drawn into the pull-in rail 47, and the strand 40 supported by the grooved roller 1 of each carrier 2 By moving the roller 1 backward, it is automatically lowered from the foremost grooved roller to the line through which the grooved rows 21 above the foundations 4, 7 and the tower 5.6 and the catwalk 33 pass.

In this way, the strand drawn out between all spans can be automatically installed directly below the drawing line.

In the case of cables for long suspension bridges, several to hundreds of strands are erected to form the cable, but until the cable is completed, the strands are inserted one by one into predetermined positions on the cable former on the catwalk. is normal.

If this invention is adopted for constructing the strands constituting the cables of a suspension bridge, the strands will be automatically placed in the predetermined positions of the cable former 56 on the catwalk 33 in sequence starting from one side of the foundation, as shown in FIG. As a result, the process is shorter than conventional methods that require temporary pulling on the foundation or tower.

The present invention is not limited to the construction of prefabricated parallel wire strands, but can also be applied to the construction of long objects such as ropes, wires, and electric wires for various purposes.

Further, the hauling rope system can be of any suitable type depending on the purpose of construction, such as a single-track type, double-track type, circulating type, or crossing type.

Furthermore, the type of connection between the carrier and the hauling rope may be a fixed type or a detachable type depending on the type of the hauling system.

According to this invention, a large number of carriers 2 having rotatable grooved rollers 1 are attached to a hauling rope 3 extending in the direction of installing a long object, and the long object to be erected is supported by the grooved rollers 1. After moving the hauling rope 3 forward to a predetermined position, fixing the front end of the hauling rope 3 and then simply driving the hauling rope 3 in the opposite direction, each groove The long object supported by the grooved rollers 1 can be automatically lowered to a predetermined location from the frontmost grooved roller,
Therefore, by omitting the temporary pulling work and the large-capacity winch for the temporary pulling sump, which were required in the conventional aerial erection method, long objects can be easily erected at low construction costs and in a short construction period. Effects can be obtained.

[Brief explanation of drawings]

Figure 1 is a schematic side view showing a state in the middle of aerial erection of a long object using a conventional aerial erection method, Figure 2 is a plan view of the same, and Figure 3 is a schematic side view showing a state in which a long object is being erected in the air using a conventional aerial erection method. It is a schematic side view which shows the state when a long object is moved from a carrier to a predetermined position. Figures 4 to 10 show an embodiment of the present invention, in which Figure 4 is a schematic side view showing a state in which a long object is being erected in the air, and Figure 5 is a side view of the carrier. , FIG. 6 is a front view thereof, FIG. 7 is a schematic plan view of the carrier receiving and discharging section, and FIG.
The figure is a perspective view showing a part of the carrier, FIG. 9 is a side view of the carrier, and FIG. 10 is a front view thereof. FIG. 11 is a plan view showing a state in which prefabricated strands are placed in the cable former. In the figure, 1 is a grooved roller, 2 is a carrier, 3 is a hauling rope, 4 is a foundation, 5 and 6 are towers, 7 is a foundation, 8
is unreeler-123 is track cable, 24-29
is a saddle, 33 is a catwalk, 38 is a hauling rope drive device, 40 is a strand, 43 is a hauling rope gripping device, 46 is a grooved wheel, 47 is a retracting rail, 49 is a rail for leaving the rope, and 50 is for leaving the rope. The roller 52 is a carrier.

Claims (1)

[Claims] 1. A long object to be erected is supported by a number of carriers attached at intervals to a hauling rope extending in the direction in which the long object is erected, and the long object to be erected is brought to a predetermined position by driving the hauling rope. In the method of forward transportation and erection, the long object to be erected is supported by the grooved rollers 1 of a plurality of carriers 2 equipped with rotatable grooved rollers 1, and then the hauling rope 3 is driven to erect the object. After the long object is moved forward to a predetermined position, the front end of the long object to be installed is fixed, and then the hauling rope 3 is driven in the opposite direction to remove the long object supported by each grooved roller 1. A method for aerially erecting long objects, characterized by lowering the objects into predetermined locations sequentially from a grooved roller at the forefront.