JPH0261209A - Method and apparatus for erecting mail cable for suspension bridge or the like - Google Patents

Abstract

PURPOSE:To make it possible to start work for temporary pulling on a transfer line by laterally transferring main cable's strand, drawn out on a draw-out line after completion of the drawing out, to transfer rollers provided on a transfer line that is placed on the top of a tower in parallel with the draw-out line. CONSTITUTION:After drawing out a strand 1 along each of draw-out rollers 10 of a draw-out line 11, slack of the drawn-out strand 1 is pulled in. then a supporting frame 21 is lifted up by operation of a lift cylinder 23 and through rise of a jack rod 24, and the drawn-out strand 1 is made afloat over the rollers 10 under free-hanging condition along the whole span of its extension. The drawn-out strand is then transferred horizontally to the side of a transfer line 20 by operation of a travelling cylinder 25. After rollers 11 and 19 are placed levelling each other, the supporting frame 21 is lowered and the strand 1, stretching over each of the draw-out rollers 10, is transferred to ride on each of the transfer rollers 19 of the transfer line 20. Therefore, it becomes possible to start, on the transfer line 20, works for temporary pulling that follow fitting of the temporary pulling clamps.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention is applicable to the construction of suspension bridges, etc., using parallel wire strands (parallel wire cables), including long-span suspension bridges. The present invention relates to a system that enables the construction work to proceed more efficiently by making it possible to use a drawer line continuously for the work of pulling out the construction.

(Prior art) A parallel wire strand in which a large number of steel cables are lined up in parallel and tightly focused into a desired cross-sectional shape is used as the main cable, and is constructed across a main tower located between two construction points. Needless to say, it is known that various suspension bridges can be obtained; for example, Japanese Patent Publication No. 60-6408, Japanese Patent Publication No. 60-60
Various techniques have been developed and presented, including JP-A-23202. Here, the individual strands constituting the main cable are connected to each main tower installed between two installation points, and to a catwalk (hanging scaffold) installed between each main tower. 10 to 12 show an overview of the conventional technology for drawing out the strand when the drawer is installed on the drawing line using a group of rollers.
This will be explained with reference to the figures.

As illustrated in FIGS. 10 and 11, when installing the individual strands 1 constituting the main cable between two installation points, the required number of main towers 2 are installed in a row between the installation points. At the same time, a catwalk (hanging scaffold) 3 is installed between each main tower 2, and a strand feeder (unleela) 4 is installed on one side of the bridge abutment, to which the strand 1 is installed.
Attach a reel wound with a tramway support rope 5, a plurality of hauling ropes 6A, 6B, a hauling rope drive winch 7.8, etc. to the hauling rope 6 in a known aerial cableway (referred to as a hauling system), One end of the strand 1 is connected to a movably mounted carrier 9, and each main tower 2 and cat The strand 1 is successively pulled out over the walk 3 to construct the structure.

At this time, a large number of groups of 10 pull-out rollers are arranged in each main tower 2 and catwalk 3, and the drawn strand 1 is supported on each of these 10 pull-out rollers. Accordingly, the extraction line 11 is constructed over the entire length of the construction. This drawing operation is listed in the order of operation as follows.

■ Set the strand reel on the strand feeder (unreeler).

■ Attach the socket 12, which is one end of the strand 1, to the carrier 9 held on the hole ring 6 side.

- Start pulling out the strand 1 by driving the hauling system for the hauling ropes 6A and 6B.

(2) The drawn strand 1 is supported on each roller 10 along a drawing line 11 formed by a group of 10 drawing rollers arranged in a row over the cat walk 3 and each main tower 2.

- When the drawing of the strand 1 of the required length is completed, the carrier 9 is moved back to the strand reel side.

■ While the carrier 9 moves back to the reel side via the hauling rope 6 for the next draw, near each tower top saddle and spray saddle in each main tower 2, the strand 1 is As illustrated, a temporary tension clamp 13 is attached to the strand 1 on the drawing line ll.

(2) Next, the strand 1 is temporarily pulled by a hydraulic temporary pulling device 1.4 installed at the top of the tower, and the strand 1 is lifted from above the drawer roll 10 of the drawer line 11 and moved onto the saddle.

■ At each saddle part, the strand 1 is shaped and a temporary pulling process is carried out to store it in the saddle. Reference numeral 15 indicates a relocation frame and 16 indicates a temporary pulling rope. It is something.

(Problem to be Solved by the Invention) At the top of the tower where the drawers are lined up along the draw-out line of the main cable strand 1 described above, the strand 1 is temporarily drawn, shaped, and relocated at each saddle portion while the carrier 9 is backing up. This method has the following problems. In other words, in recent long suspension bridges, in order to eliminate the loss time caused by backing up the strand carrier after pulling out one strand, and to perform highly efficient strand pulling out, the strands are sent out on both sides of the construction point. Machine (
It has been considered that the strands are laid alternately without a carrier bag by installing an unreeler (unreeler). Attaching the expropriation clamp 13 or making preparations for expropriation in
This increases the occupation time of the drawing line 11, and it is impossible to draw out the next new strand unless each drawing roller 10 on the same line 11 is empty. Therefore, continuous drawing of the strand 1 with higher efficiency is To the extent that it is difficult, there are problems to be solved.

(Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention aims to arrange the strands drawn out to the drawing line in parallel to the drawing line at the top of the tower after the drawing of the main cable strands is completed. By moving it laterally onto the relocation roller on the relocation line, the extraction line is quickly vacated, and the expropriation process is carried out on the relocation line.
Strands can be drawn out immediately on the vacant draw-out line, and specifically, strands can be drawn out in a row across both the towers placed between two erection points and the catwalks placed between each tower. A main cable strand connected to a carrier held by a movable hauling rope is pulled out in one direction on a pull-out line by a group of pull-out rollers through the movement of the carrier, and when the predetermined length of pull-out is completed, the pull-out The strand drawn out over the line is moved vertically and horizontally by a plurality of transfer rollers arranged in parallel with the pull-out line onto the transfer line, and the pull-out roller of the draw-out line or the transfer roller of the transfer line is moved vertically and horizontally. The strand is moved over the relocation roller of the relocation line through the relocation line to vacate the withdrawal line, and the strand moved onto the relocation line is expropriated, and a new strand is withdrawn onto the vacated withdrawal line. Furthermore, as a device for carrying out the above method, a plurality of pull-out rollers are arranged in a row at regular intervals in the vicinity of the tower top saddle at the top of each tower disposed between two erection points. In parallel with this, a plurality of transfer rollers belonging to the transfer line are arranged in the same row (at regular intervals and in different positions from the pull-out rollers, and each pull-out roller in the pull-out line or each transfer roller in the transfer line is The purpose of the present invention is to provide a roller that can be vertically raised and lowered and horizontally moved relative to the other roller.

(Function) According to the above-mentioned technical means of the present invention, in FIGS. 1a and 1b, the strand 1 for the main cable is prepared by the same conventional method as previously illustrated in FIG.
A pull-out line 11 is formed by arranging 10 groups of pull-out rollers.
After pulling out the sockets 12 at both ends of the strand 1 using, for example, a winch (not shown) as shown in FIG. After removal and tensioning as shown, the top section 1 with the top saddle 17 in each main tower 2 is removed as illustrated in FIGS. 3 to 5.
8, conventional pull-out rollers 1 are arranged in a row at regular intervals.
In addition to the pull-out line 11 made up of a plurality of rollers 10, a transfer line 20 made up of a plurality of transfer rollers 19 disposed at regular intervals and located between each of the pull-out rollers 10 of the pull-out line 11 is added to the pull-out line 11. The elevating cylinders 23 are arranged in parallel and each of the drawer rollers 10 in the drawer line 11 is held by a common holding frame 21 during rotation, and the holding frame 21 is movable on the top 18 via a cart 22. Connected to jack rod 24,
Furthermore, by connecting the moving rod 26 of the traveling cylinder 25 to the trolley 22, the strand 1 is pulled out along each drawing roller 10 of the drawing line 1 as shown in Fig. 1a, and then as shown in Fig. 1b. Remove the slack in the pulled out strand 1, and attach it to the holding frame 21 as shown in Figure 3.4.
The strand 1 is raised by driving the lifting cylinder 23 and raising the jack rod 24, and the strand 1 drawn out by raising each drawing roller 10 is floated from each drawing roller 10 in a free-hanging manner over the entire length of the drawer. , drives the traveling cylinder 25 and horizontally moves it to the transfer line 20 side through the movement of the moving iron 26, and each roller 11,
By lowering the holding frame 21 with the rollers 19 in the same line, the strand 1 extending over each pull-out roller 10 is transferred onto each transfer roller 19 in the transfer line 20. By thus returning the drawing line 11 to its previous position, the drawing roller 10 on the same line 11
is now in an empty state, and therefore, on the relocation line 20, the Iida process starting with the installation of the expropriation clamp is started for the moved strand 1a, and at the same time, a new strand 1 is drawn out on the empty drawing line ll. This makes it possible to continue immediately, and this makes it possible, for example, to install a strand unreeler on both sides of the two installation points, and to program a program in which the strands 1 are alternately pulled out and installed without a carrier bag.

(Example) A suitable example of the erection method and device according to the present invention will be described below.
The explanation will be made in parallel from Figure A to Figure 8.

In Figures 1a, 1b, and 2, Figure 1a is formed across each main tower 2 between two erection points and a carrier walk (hanging scaffold) 3 installed between each main tower 2. The main cable strand 1 is shown pulled out on the pull-out line 11 by the conventional method illustrated in FIG. Using approximately drum-shaped rollers, a large number of drawer rows 910 are arranged in rows at required intervals along the entire length of the catwalk 3 and at the top 18 of each main tower 2 to form a line 11. FIG. 2 illustrates the structure of the abutment section 27 on one side of the two erection points, and the same reference numerals as shown in FIG. 9.10 and FIG. 1 indicate the same members. As will be described later, the line height of the strand 1 suspended from the relocation line 20 installed at the top of each main tower 2 in a free-hanging state is slightly higher. In the figure, 28 is an abutment crane, 29 is a reel exchange crane, and 30 is a puller at one end of the hauling rope 6, all of which belong to known structures.

As shown in FIG. 1a, the strand 1 pulled out by the carrier 9 has slack over its entire length.
As shown in Fig. 1b, the sockets 12 and 12 at both ends of the pulled out strand 1 are pulled in in the direction of the arrow in Fig. 1b using an existing winch (not shown) to remove the slack. They are placed in such a way that they do not cause any problems during relocation.

In the embodiment shown in FIGS. 3 to 5, the pull-out rollers 10 on the top side of each tower in the pull-out line 11 are movable relative to the transfer rollers 19 of the transfer line 20, and the strand 1 is transferred by horizontal lateral movement. As shown in the figure, the main tower 2 is equipped with a tower top saddle 17.
At the top 18 of the bracket 21, a plurality of pull-out rollers 10 are arranged in rows at regular intervals on a common holding frame 21.
The pull-out rollers 10 are each mounted on a shaft, and the entire holding frame 21 is supported by two lifting cylinders (hydraulic) on the nursery school side.
The carriage 22 is held so as to be raised and lowered synchronously by a jack rod 24 that can be raised and lowered under pressure at 23, and is equipped with wheels 32 on which the raising and lowering cylinders 23 and 23 are installed and mounted on a guide rail 31. 1
A moving rod 26 of a traveling cylinder (hydraulic) 25 installed on the tower 8 is connected to enable the holding frame 21 to move forward and backward toward the side surface of the tower top saddle 17. However, this vertical lifting and horizontal movement mechanism is not limited to the kindergarten side.

In the relocation line 20 provided parallel to the pull-out line 11 by the pull-out roller 10, known saddle side rollers arranged in a row on the side surface of the tower top saddle 17 via brackets 33 are used as the relocation rollers 19 in the embodiment. As shown in the figure, the rollers 19 are arranged in rows at regular intervals at intermediate positions of the pull-out rollers 10 and 10 by respective brackets 33, thereby creating parallel fixed transfer lines 2.
0 is constructed. At this time, depending on the number of transfer rollers 19 installed, transfer rollers 19 can also be provided outside the tower top saddle 17 via brackets 34, as illustrated in FIG. According to this embodiment, as described above in the function section, the catwalk 3 and the main tower 2
After drawing out the strand 1 on the drawing line 11 over the entire length of the drawing line 11, the strand 1 on the drawing line 11 is pulled out under tension by removing the slack by vertically lifting and horizontally moving the holding frame 12. As shown in FIG. 5, the strand can be moved over each transfer roller 19 of the transfer line 20, in which 1a indicates the strand that has been moved onto the transfer line 20. Therefore, with this transfer, each pullout line 11 on the holding frame 21 has been restored to its old position.
The pull-out roller 10 belonging to will be vacated.

Therefore, as also shown in FIG. 5, it is possible to immediately draw out and install the next new strand 1 on this vacated drawing line 11.

On the other hand, for the strands 1a on each transfer roller 19 of the transfer line 20, the removal work that ends with the attachment of the removal clamp 13, removal, shaping, and transfer into the tower top saddle 17 can be easily carried out, and in the figure, 1b indicates strand 1 during bale use.

As can be easily guessed from the description of the embodiment shown in FIGS. 3 to 5, the drawing roller 1 in the drawing line 11
0 is vertically lifted and lowered and horizontally moved horizontally with respect to the transfer roller 19 in the transfer line 20.
The same purpose can also be achieved by vertically moving up and down and horizontally moving the transfer roller 19 at 0 in relation to the pull-out roller 10 in the pull-out line 11. 6th
Figures 8 through 8 show examples thereof. In this case, as shown in the figure, the transfer rollers 19 belonging to the transfer line 20 are arranged and held in a common holding frame 21, and the pull-out line 1
Each of the pull-out rollers 10 belonging to 1 may be arranged in a row on a bracket 33 fixed to the side surface of the tower top saddle 17, for example, and the holding frame 21 of the transfer line 20 is connected to the traveling cylinder 25 and the lifting cylinder 23. In other words, it is sufficient to enable horizontal movement and vertical movement. This time 7th
As illustrated in the figure, if necessary, the pull-out roller 10
It is also possible to add the bracket to the outside of the tower top saddle 17 via the fixing bracket 34, and as illustrated in FIG. 8, the same operation and effect as the embodiments in FIGS. Needless to say. Of course, you are free to choose which movable method to use. Further, in carrying out the invention, the slack of the strand 1 shown in FIGS. 1a and 1b may be taken up, and at the same time, the strand 1 may be placed in a free-hanging state.

Note that the present invention is also applicable to a device having a side tower 2A shown in FIG. 9, and in this case, the above-mentioned pull-out roller and the like are provided at the top of the side tower 2A.

(Effects of the Invention) According to the present invention, when constructing a conventional main cable strand, the strand that has been completely drawn out along the drawing line is immediately moved laterally to a relocation line provided parallel to the drawing line, By performing a series of expropriation processing for the strands below the attachment of the expropriation clamp on the relocation line, it is possible to perform expropriation, shaping, and relocation on the drawer line between the carrier packs as in the past. This eliminates the unreasonable situation of occupying a drawer line for a long time and making it impossible to construct a drawer on the same drawer line until the expropriation process is completed. It is extremely advantageous in that the erection can be carried out continuously with almost no loss time, and the speed of strand erection can be increased. At this time, a transfer line for moving the strand 1 on the draw-out line is configured at the top of each main tower in parallel with the conventional draw-out line, and any roller group on the draw-out line or transfer line is configured. By making it a movable structure that can move up and down vertically and horizontally relative to the other roller group, the lateral movement of the strand can be achieved smoothly and reliably, and the free-hanging posture of the strand at the top of each main tower allows for The strand can be reliably suspended on the roll over a period of time, making the operation quick and easy.
As a result, only a simple method and device is required, and a strand feeder (unreeler) is installed on both sides of the two erection points, and the carrier back means is omitted and the strands are continuously fed alternately from both sides. It is also possible to execute a drawer construction program, which is especially useful when constructing long suspension bridges where many strands are assembled as the main cable, such as parallel wire strand cables.
It is extremely advantageous that the strand drawer erection work can proceed with high efficiency.

[Brief explanation of the drawing]

Figures 1a and 1b are explanatory diagrams showing slack removal work during drawer erection of the strand of the present invention, Figure 2 is a front view of the main part of the abutment in a conventional erection device, and Figure 3 is an embodiment of the method and apparatus of the present invention. 4 is a front view of the embodiment, FIG. 5 is a perspective view showing the overall operating state, FIG. 6 is a side view showing the method and apparatus of the split embodiment, and FIG. 7 is the same. A front view, FIG. 8 is a perspective view showing the operating state of the whole, FIG. 9 is an explanatory diagram of an embodiment of the present invention having a side tower, FIG. 12 is an explanatory diagram of the strand drawn out state, and FIG. 12 is an explanatory diagram of the strand bale state. 1-・- Main cable strand, 2- Main tower, 3-
Cat walk, 4--Strand feeder (unreeler), 6--Hauling rope, 7, 8--Drive winch, 9--Carrier, 10--Pull-out roller, 1
DESCRIPTION OF SYMBOLS 1.-Drawer line, 19-.Relocation roller, 20.-Relocation line, 21-.Holding frame, 23.--Lifting cylinder, 24-.-. Jacket rod, 25--travel cylinder, 26- moving rod.

Claims (2)

[Claims] (1) Movably held on a hauling rope on a pull-out line by a group of pull-out rollers arranged across both the main tower placed between two erection points and the catwalk placed between each main tower. The main cable strand connected to the carrier is pulled out in one direction through the movement of the carrier, and when the predetermined length of drawing is completed, the strand that has been drawn out over the drawing line is lined up parallel to the drawing line. The pull-out line is moved over the transfer rollers of the transfer line by vertically raising and lowering and horizontally moving the pull-out rollers of the pull-out line or the transfer rollers of the transfer line. A method for constructing a main cable for a suspension bridge, etc., characterized by temporarily pulling out strands that have been moved onto a vacant or relocated line, and continuing to pull out new strands on the vacated pull-out line. (2) At the top of each tower installed between two erection points, a plurality of pull-out rollers belonging to the pull-out line are arranged in a row at regular intervals near the tower top saddle, and a relocation line is placed in parallel with this. A plurality of transfer rollers belonging to the above are arranged in a row at the same regular intervals and in different positions from the pull-out rollers, and each pull-out roller in the pull-out line or each transfer roller in the transfer line is vertically raised and lowered relative to the other roller. and a main cable installation device for a suspension bridge, etc., which is provided so as to be horizontally movable.