JPS61250204A - Formation of cable for suspension structure - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method of forming cables for suspended structures, and more particularly, to a method for forming cables for cable-stayed bridges, which are made of PC# stranded wires and a sheathing material attached thereto. It relates to a method of forming an ink.

BACKGROUND TECHNOLOGY Cables used in bridges have been cables with parallel wire strands covered with a synthetic resin cover, called pcfRB.
The wire is covered with a steel pipe or synthetic resin pipe, and a solidified filler such as cement for rust prevention is injected into the internal void.
There are some that are equipped with a plated locked coil. In such prior art, cables are manufactured in advance at a factory, and after being strung at the construction site,
They are painted, covered with a cover, or injected with a coagulating filler to prevent rust.

When performing such painting work, it is necessary to provide scaffolding along the entire length of the stretched cable.

Therefore, workability is poor and construction costs are high.

Furthermore, the prior art has the following problem d. In other words, since the cover or tube is made of synthetic resin,
It deteriorates over a short period of time and has a short service life, and it takes time and effort to insert spacers to position the stranded wires into steel pipes or synthetic resin pipes, and it is difficult to inject the filler smoothly. In addition, 1. The plating process and painting make it expensive and there are problems with its service life.

Problems to be Solved by the Invention The object of the present invention is to solve the above-mentioned technical problem! By solving this problem, it is possible to form and construct cables made of PC steel strands and sheathing material with a dramatically improved service life at the construction site, while reducing the scaffolding area as much as possible when forming the cables. It is an object of the present invention to provide a method for forming a cable for a suspension structure, which enables economical and quick construction.

Means for Solving the Problems The present invention provides for a method in which a guide wire rope is strung obliquely near the position where the cable is to be strung, and a portion of the guide wire rope is stretched along the guide wire rope near the lower end of the guide wire rope. P with a foothold and visibility
One end of the C stranded steel wire is raised along the guide wire rope, and an operator jumps to the scaffold and places a straight line on the part of the pc@stranded wire that is in a straight line along the guide wire rope. Attach a rigid exterior material having an axis, repeat the above-mentioned raising step and the exterior material attachment step, and then
This is a method for forming a cable for hanging structure, which is characterized by covering the entire length of the cH withdrawal line with an exterior material.

Effect According to the present invention, the guide wire rope is strung diagonally,
Scaffolding was partially set up along the guide wire rope near the bottom of the guide wire rope, and workers mounted the scaffold to attach the sheathing material to the PCTSM line.
It is not necessary to form a scaffold over the entire length of the cable as in the past, and therefore it is possible to reduce construction costs and construction time as much as possible. Furthermore, since the pc*ms is coated with an exterior material, it is possible to stretch a cable with excellent corrosion resistance.

Example Figure 1 is a diagram for explaining the outline of the cable forming method according to the present invention, and Figure 2 is a schematic diagram of a cable-stayed bridge constructed by the cable forming method shown in Figure 1. 1, a tower 2 is installed extending vertically. A guide wire rope 5 is stretched between the anchoring section 3 fixed to the top 2a of the tower 2 and the anchoring section 4 fixed to the girder 11Il. A cable lifting wire rope 6 extending along the guide wire row 15 is arranged above the guide wire rope 5 . One end of the wire rope 6 for lifting the cable is wound around a roller luff attached to the fixing section 4, and the other end of the wire rope 6 is wound around the winch 10 via pulleys 8 and 9. Cable lifting oil I for Wire Me Pro
A plurality of I4.11s are installed at regular intervals.

A scaffold 12 is provided near the anchoring portion 4 of the guide wire rope 5. A worker stands on this scaffold 12 and attaches the protective sheathing material 14 to the cable 13 made up of a plurality of twisted PC steel #t20 (see FIG. 3) supplied via the anchorage s4.

When one exterior material 14 is attached to the cable 13,
The winch 10 is operated to raise the cable 13 along the wire rope 5 in the dormitory using the night pIc11. Then, apply the sheathing material 1 to the next part of the cable 13 in the same manner as described above.
4), operate the winch 10, and remove the cable 13.
to rise. At this time, each exterior material 14 is connected to each other by interposing a joint 70 behind the exterior material 14. This joint 70 is, for example, the Jitsunsho-110, which the present inventor has already invented.
709 is used.

By repeating the steps of raising the cable 13 and attaching the sheathing material 14 to the cable 13, the composite cable 15 in which the cable 13 is coated with the sheathing material 14 is attached to the fixing part 3.4. It is strung with cotton. By stretching a predetermined number of such composite cables 15 in relation to the tower 2, a cable-stayed bridge 16 is constructed as shown in FIG.

FIG. 3 is a cross-sectional view taken from the section line ■-■ in FIG. 13 is an overall view. The required number of ps (19 in this example) in parallel
The unit protective sheathing material 14 of the cable 13 in which the c@ stranded wires 20 are assembled is made of a lightweight, corrosion-resistant, and rigid material such as aluminum. This exterior material 14 includes a pair of half-split covers 21 and male fitting portions 2 provided on both side edges of the covers 21 so as to be connected to each other by fitting.
2 and a female fitting part 23.

The female fitting portion 23 and the male fitting s22 are composed of a groove 23m and a protrusion 22m that is pushed into the groove 23m.
The serrated grooves provided on both sides of the rising protrusion 22m are engaged to maintain a bonded state without detachment.

Also, provided inside the cover 21 is an elastic spacer 24 that is fitted into and engaged with the cover 21 and maintains the assembled shape of the cables 13. This elastic spacer 24 is an elastic plate 24m made of rubber or soft synthetic resin.
and a parallel groove part 24b provided so that a part of the outer periphery of the PCfI4m wire 20 fits into the surface of the elastic plate 24a, and is arranged livingly inside the cover 21.

The engagement of the elastic spacer 24 with the cover 21 is achieved by integrally providing parallel protrusions 25 having a bulging portion at the tip end edge in the axial direction of the inner surface of the cover 21, and fitting the protrusions 25 into the elastic spacer 24. The groove 26 is provided, and the spacer 2 is first
4 to widen the concave groove 26, and then insert the concave groove 2 into the protrusion 25.
6 are fitted together, and the elastic spacer 24 is unbent and attached. In this way, the elastic spacer 24 that maintains the collective shape of the cables 13 is arranged inside the cover 21, so that the elastic spacer 24 prevents the PC#4 stranded wire 2o from spreading outward from the middle 6. 24, so that the cover 21 is not affected by the cable 13, and therefore no extra force is applied to the side edge joints of the cover 21, making it possible to maintain a secure joint state.

Note that the cover 21 is formed by cutting an extruded aluminum material into predetermined lengths.

Further, in this embodiment, the PC#1tfli wire 20 is of an unpond type coated with a polyethylene resin 27.

Sockets 27 are attached to both ends of the cable 13.

A steel pipe 62 is attached to one end of this socket 27. A plurality of PC steel strands 20 are bundled within the steel tube 62 by a cable band 28 and further secured by a crimp clip 29 near the end of the socket 27.

FIG. 5 is an enlarged view of the cable lifting oil 1Icii. The cable lifting oiler 11 includes a socket lifting oiler 30 and a lifting oil Jl-31 for lifting the part to which the exterior material 14 is attached.
includes a pair of brackets 32 fixed to the lifting wire rope 6 at a fixed interval and a base 33. A roller 34 is rotatably supported on the bracket 32, and this roller 34 is provided with a guide. It is in contact with the wire rope 5.

Therefore, when the wire rope 6 rises in the direction of arrow A, the roller 34 rotates while being guided along the guide wire rope 5.

Seven hooks 35 are provided at the lower end of the bracket 32.

The seven hooks 35 are connected to a locking ring 36 provided on the base 33 via a locking member 37. Thereby, the base 33 is supported by the bracket 32. Base 33
A locking piece 38 is provided, and the socket 27 is locked onto the base 33 by this locking piece 38.

The lifting oil 14c31 is supplied to the bracket 32 and a rotor that is rotatably supported by the bracket. 34, 7/35 fixed to the end of the bracket 32, and the exterior material 14.
and a support member 39 that supports the cable 13 to which the cable 13 is attached.

From Figure 6 to Figure 7, the sheathing material 14 is attached to the cable 13.
* FIG. 8 is a side view of the exterior material fitting jig 4o seen from the arrow B@ in FIG. 7. The exterior material fitting jig 40 includes a main body 41, a hydraulic jack 42, and half-split gripping members 43 and 44.

The main body 41 consists of a pair of support pieces 45 that are roughly U-shaped and a connection piece 46 that connects the support pieces 45 to each other. Support piece 4
5 includes a base 47 and a pair of legs 48a and 48b extending downward from both ends of the base 47.

The hydraulic jack 42 is supported by the connecting piece 46. The drive shaft 49 of this hydraulic jack 42 is attached to the mounting 1 at its lower end.
It is connected to so by a bolt 51 and a socket 52. The attachment $150 is fixed to the outer peripheral surface of the gripping member 43 by welding or the like.

The lower end of the leg 48m and one end of the connecting member 53 are connected to the bin 54.
Therefore, the connecting member 53 is swingable around the axis of the bin 54. The connecting member 53 has a cross section perpendicular to the axis having a roughly semicircular arc shape. The gripping member 44 is fixed to the inner peripheral surface of the connecting member 53.

The other end of the connecting member 53 can be connected to the lower end of the leg 48b with a bolt 55 and a nut 56.

Under normal conditions, this cable lifting oilman 40 is 1#6
As shown in the figure, the other end of the connecting member 53 and the leg portion 47b
The connection status with has been canceled. In the state shown in FIG. 6, the cable 13 is placed below the gripping member 43 and between the legs 48a and 48b. and a pair of covers 2
1 facing the cable 13, then the connecting member 53 is angularly displaced around the axis of the bottle 54, and the connecting member 5
3 is fixed to the leg portion 48b with a bolt 55 and a nut 56. In this way, the cable 13 is housed within the cover 21 via the gripping members 43 and 44. In this state, the hydraulic jack 42 is driven. As a result, the drive shaft 49 is displaced downward, and the protrusion 22m and the groove 23m of the cover 21 are engaged with each other, so that the pair of covers 21 are engaged with each other. In this way, the sheathing material 14 is attached to the cable 13. Note that such work is performed by a worker on the scaffolding 12.

FIG. 9 is a diagram showing the manufacturing process of the composite cable 15,
FIG. 10 is its 70-chart.

Moving from step n1 to step n2, PC steel fi#1
20 is cut into a predetermined length. Then, proceeding to step n3, as shown in FIG. 9 (1), the polyethylene coating 2t of the end of the PC#1 IPA wire 20 is
is removed. Then, proceed to step n4, and ts
As shown in FIG. 9 (2), winding onto the drum 50 is performed. - At this time, for example, in this embodiment, 19 pieces are wound at once. Steps 12-14 like this
The work in is carried out in advance at the factory. After a plurality of PCG wires 20 are wound around the drum 5o in this manner, it is transported to the construction site, and the following steps at the construction site are performed.

In step n5, the cable 13 is unfolded. That is, as shown in FIGS. 9(3) and 9(4), the PC steel wire 20 wound around the drum 50 is shaped into the cable 13 using the shaping plate 60. This shaping plate 60 has a plurality of through holes formed in a fly cam shape at predetermined positions. By this shaping plate 60, the cable 13! ! After the darkening is completed, the process moves to step n6, where the PC#l twisted wire 20 is inserted into the fixed side socket 27 from the direction of arrow C as shown in FIG. 9 (5), and the locking member 61 is further inserted. Also insert it. Then, in step n7, a crimp clip 29 is attached to the end of the pc@stranded wire 20 through which the locking member 61 is inserted. and step n8. Moving on to n9, Figure 9 (6
), the cable band 28 and the steel pipe 6
2. Thus, in steps 15 to n9, the installation work of the socket 27 on the fixed side is completed.

Next, in step nlo, the sheathing material 14 is attached to the cable 13, and the cable is pulled up. That is, as shown in FIG. 9 (7), a worker on the scaffold 12 uses the exterior material fitting jig i! At 4:40, the sheathing material 14 is attached to the cable 13. and 1
When two exterior materials 14 have been installed, the cable lifting oiler 11 is attached to the cable 13 and the winch 1
0 to raise the cable 13 to which the sheathing material 14 is attached. Then, apply the next new exterior material 14 to the cable 13.
Attach to. In addition, at this time, each exterior material 14 is connected by interposing the joint 70 between the exterior materials 14. By sequentially repeating the step of raising the cable 13 and the step of attaching the sheathing material 14 to the cable 13, the sheathing material 1 is attached to the cable 13 over the entire length of the fixing section 3.4.
4 can be coated.

Next, the process moves to steps nl 1 and nl 2, and FIG.
As shown in 8), temporary cable pulling and cable marking work is performed. In step n13, the excess length of the cable 13 is cut off, and then the process moves to step n14, where the adjustment side socket 27 is added. Then move on to step n15,
As shown in FIG. 9 (9), the cable is pulled in, and in step n16, the socket 27 is filled with resin or the like. Then, in step n17, all the work in the cable manufacturing process is completed.

In this way, the PCflItI & wire 2 manufactured in advance at the factory
A plurality of cables 13 are formed by bundling a plurality of cables 0 at the construction site, and the cable 13 is coated with an exterior material 14, and the composite cable 15 can be stretched at a place where the composite cable 15 is to be stretched. A cable-stayed bridge 16 can be constructed by suspending a required number of such composite cables 15 in relation to the tower 2.

Although the above-mentioned embodiment describes the diagonal AG11 cable, the present invention is not limited to this.
The present invention can also be suitably implemented when forming cables for other hanging structures.

Effects As described above, according to the present invention, it is possible to form a composite cable consisting of a couple and a sheathing material covering the cable at the construction site.

Furthermore, only partial scaffolding is required, and there is no need for full scaffolding or catwalks as in the past, making it possible to carry out economical and rapid construction.

Furthermore, since the cable formed according to the present invention is covered with an exterior material, it is possible to prevent corrosion of the cable due to rainwater, etc., and a composite cable with a long service life and number can be realized.

[Brief explanation of the drawing]

Fig. 1 is a diagram for explaining the outline of the cable forming method according to the present invention, Fig. #112 is a diagram of a canopy-type cable-stayed bridge realized by the present invention, and Fig. 3 is a cross-section line of Fig. 1. ■−■
3A is a perspective view showing how the exterior material 14 and the elastic spacer 24 are attached, and FIG. 4 is a sectional view of the cable 1
Figure 5 shows the entire cable lifting oil tank 11.
An enlarged view of the vicinity, FIG. 6 is a front view of the exterior material fitting oil 14C40 when the connecting member 53 is open, and FIG. 7 is a front view of the exterior material fitting jig 40 when the connecting member 53 is closed. Figure 8 is a side view of the exterior material fitting oil A40 seen from the arrow B@ in Figure 7, Figure 9 is a diagram showing each step of the cable forming method, and Figure 10 is a diagram showing the cable forming method. It is a 70-chart showing each process. 5... Guide wire robe, 6... Wire rope for lifting cables, 10... Winch, 11... Oil for lifting cables, 12... Scaffolding, 13... Cable, 14... Exterior material, 15... Composite cable, 16
...Cable-stayed bridge, 20...PC@@, 21...Cover, 24...Elastic^pacer, 27...Socket, 40
... Exterior material fitting jig Representative Patent attorney Number of strokes Keiichi Fig. 9 Fig. 9

Claims (1)

[Scope of Claims] A guide wire rope is strung obliquely near the position where the cable is to be strung, and a scaffold is partially provided along the guide wire rope near the lower end of the guide wire rope. P with flexibility
One end of the C steel strand is raised along the guide wire rope, and an operator stands on the scaffold and draws a straight axis line to the part of the PC steel strand that is in a straight line along the guide wire rope. 1. A method for forming a cable for a hanging structure, comprising: attaching a rigid sheathing material having the above-described steps, and then repeating the above-mentioned raising step and sheathing material attaching step to cover the entire length of the PC steel stranded wire with the sheathing material.