JPS5830963B2 - Method and device for transferring parallel cable strands to saddle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the provision of a new relocation method and relocation device for relocating parallel cable strands of a long suspension bridge to a tower top saddle.

There are two methods for installing cables on suspension bridges: the AS (air spinning) method and the PWS (prefabricated parallel cable strand) method. can be,
The PWS construction method is a method in which dozens or more of the bare wires are bundled in advance at a factory to form a so-called parallel cable strand (hereinafter simply referred to as PWS), and this PWS is transported to the construction site and installed. Although it is already well known that this PWS construction method requires the work of relocating the PWS to the tower top saddle.

In other words, the PWS pull-out line is generally different from the cable installation line, and it is necessary to move the pulled-out PWS laterally onto the cable installation line.
The WS is supported at many points on the catwalk in the span, and the tension is low and it is in a sagging state, so the PWS
In order to construct the PWS in a predetermined shape, it is necessary to pull the PWS toward the tower top saddle, and in order to fit the PWS into the saddle, it is necessary to shape the PWS into a rectangular cross-sectional shape. In cable construction work for suspension bridges using the PWS construction method, the PWS is pulled out onto a pull-out roller installed on a catwalk, and the PWS is moved from the pull-out roller onto the saddle near the saddle to form the PWS into a rectangular cross section. This series of operations is the so-called PWS.
This is the molding and relocation work.

Needless to say, PPWS has 91 high-tensile steel wires and 12
It is a strand made of seven hexagonal wires bundled in parallel, and since each strand within the strand can be moved more freely than in a regular wire rope, the strand is formed into a rectangular shape near the top saddle. It is one of the extremely difficult tasks to fit it into a predetermined position within the saddle while maintaining its shape.

Furthermore, since interlacing of the strands has a negative effect on the cable properties, it is important to reliably carry out the shaping and relocation as designed.

Various construction methods and means for using jigs have been developed and proposed to ensure that such molding and relocation work can be carried out reliably and easily.

For example, a PWS relocation method using a special ramp (Japanese Patent Application No. 48-28497), a relocation molding method that pulls in the PWS near the saddle to kill tension and facilitate its molding and relocation (Japanese Patent Publication No. 5140738), A relocation device (Japanese Patent Application Laid-open Nos. 52-150896 and 53-54832) is used to safely and reliably pull the PWS near the saddle, kill the tension, and create a free-hanging state. It is also known that various methods and devices have been proposed from both sides of soft and hard, such as strand forming machines for forming strands.Recently, hydraulic transfer equipment and vibrating strand forming machines have been used to A method of forming and relocating the PWS has also been developed, and the accuracy of the equipment and machinery is good, but the relocation work itself is similar to the conventional method, in which the PWS is placed on the tower top saddle at five to six locations using base wire. The PWS is lifted from one end of the saddle and molded into a rectangular cross section using a vibration molding machine, while the lifting height is sequentially changed and the PWS is placed in a predetermined position within the saddle.
This is a method that relies on experience and intuition, and it is difficult to maintain the PWS shape after molding because the PWS may be twisted due to imbalances in the lifting position and height of the PWS, and the mutual restraining force of the wires up to the lifting point. There is a problem.

The present invention improves these conventional techniques and provides a machine and a jig that can reliably hold a PWS shape formed into a desired cross-sectional shape and that can be reliably placed in a predetermined position in a saddle by a small number of workers. Regarding the provision of new relocation means for simultaneous use,
The binding force between the strands when lifting the PWS for molding and relocation is weakened, the difference in length between the strands can be easily sent to the other end as the PWS is formed by molding, and the lifting position can be easily moved. P with an idling roller type lifting jig
In order to lift the WS and store it in a predetermined position in the saddle while retaining the PWS shape formed by the forming machine, instead of lifting the formed PWS, an idling roller connected to the forming machine collapses the form. The PWS is supported by a prevention jig, and the molding machine is installed on a movable trolley that straddles the saddle, making it movable on the saddle. This reduces the number of lifting and hanging points for the PWS and the number of workers required. It enables accurate relocation and efficiency by shortening work time, and its characteristics are as follows:
In moving the parallel wire cable strand pulled out onto the pull-out roller installed on the cat walk from above the roller to the saddle near the top saddle, and transferring it to the saddle at a predetermined position while forming it into a predetermined cross-sectional shape. , the unformed parallel cable strand pulled out on the pull-out roller is lifted by a group of lifting jigs that have a support surface by the idler roller, and the strand is transferred to a movable trolley mounted on a tower top saddle so that it can run freely. The formed parallel wire cable strand is molded into the desired cross-sectional shape by a set vibration molding machine, and a plurality of roller groups are installed in a row to support the bottom and both sides of the strand, which is connected to the vibration molding machine so as to be able to move along with the molded parallel wire cable strand. The main feature is that the jig body is moved to a predetermined position in the saddle via a deformation prevention jig, which is attached to the saddle. An idling roller type lifting jig, which has a plurality of idling rollers that support the circumferential side of an unformed parallel wire cable strand, combined vertically and horizontally inside the jig, and an unformed parallel wire cable strand lifted by the jig. In order to form the desired cross-sectional shape, a vibration molding machine is attached to a movable trolley mounted on the top surface of the tower top saddle so that it can run freely over the length of the saddle, and a vibration molding machine is installed at one end of the vibration molding machine. The present invention is comprised of a deformation prevention jig in which a plurality of support roller groups are connected and movable within the saddle and that support the bottom and both side surfaces of the formed parallel wire cable strand.

The present invention will be described in detail below based on the illustrated embodiment. FIG. 1 shows the drawing and lifting of a PWS by a conventional method, and in the figure, 1 is a tower top vent frame, 2
3 indicates a tower top saddle, 3 indicates a cat walk, 4 indicates each pull-out roller on the cat walk 3, and 5 indicates a PWS.

That is, in the conventional method, the PWS 5 is moved to a predetermined position on the pull-out roller 4 on the cat walk 3 by the temporary pulling clamp 8 of the temporary pulling rope 7 operated by the hydraulic relocation device 6 installed at the top of the tower top vent frame 1. , and pull the PWS 5 onto the tower top saddle 2 by pulling in the temporary pulling rope 7, and lift the PWS 5 as shown in the figure with the wire rope 10 of the strand lifting chain lock 9 to make the PWSS in a free-hanging state. In the figure, reference numeral 11 indicates a pull-out tower top side roller, and the arrow P in FIG. 1 indicates the direction of the bridge axis, and the arrow P' in the same figure indicates the direction perpendicular to the bridge axis.

Conventionally, after leaving the PWS5 in a free-hanging state in this way, the PWS5 was molded and the saddle 2 was molded as shown in Figure 2 I, ■.
The relocation will take place.

That is, as shown in FIG. 1, the vibrating molding machine 12 is
while applying vibration to the PWS wire.
It is molded into a rectangular cross section (rectangular cross section), and the arrow Q indicates the direction in which the molding is transferred.

In this way, as shown in FIG. It is preferable to make them as parallel as possible,
For this reason, as shown in Figure ■, the wire rope 10
It is necessary to suspend it by

Here, the conventional way of suspending the PWS 5 using the wire rope 10 is as shown in FIG. 3I, as shown in FIG.
In order to suspend the PWS 5 with the rope 10 in this way at the ■ position, the PWS 5 tends to lose its shape after molding, and a defect occurs that makes it difficult to fit into the groove 2a of the tower top saddle 2.
In addition, the number of places where the wire rope 10 is suspended increases, and in the type of hanging the PWS 5 in a U-shape as shown in FIG. This makes movement difficult, and relocating the PWS 5 into the saddle 2 requires a long time and a great deal of effort.

On the other hand, the relocation method of the present invention is schematically shown in FIGS. 2I and IV and FIG. 3 (3).

That is, in the present invention, the method of bringing the PWS 5 into a free-hanging state may be substantially the same as the conventional method shown in FIG. Using an idle roller type lifting jig 13 that can be lifted and lowered by
The molding of the PWS 5 hoisted by is carried out by a vibration molding machine 15 that is set on a movable trolley 14 that is movably provided on the saddle 2 and moves together with the trolley 14. The shaped PWS 5 is stored in the groove 2a of the saddle 2 by a roller-type deformation prevention jig 16 connected to the forming machine 15, instead of being suspended by a wire rope 10 or the like as in the conventional case. By using these idle roller type lifting jig 13, vibration molding machine 15 set on a movable cart 14, and roller type deformation prevention jig 16, this method is significantly different from the conventional method.

In the present invention, after forming the PWS 5 in a free-hanging state by the idling roller type lifting jig 13 into a desired cross-sectional shape and setting it in the vibrating forming machine 15, the forming machine 15 is placed on the saddle 2. Set it on the mobile trolley 14 mounted on P
We will start molding WS5, and in this way we will move the mobile trolley 1.
While molding the PWS 5 with the vibration molding machine 15 set at 4, the movable cart 14 is moved in the direction of the arrow Q in the molding movement direction, and the molded PWS is passed through a roller type deformation prevention jig 16. It is stored in the groove 2a of the saddle 2, which allows for smooth and easy molding of the PWS 5.
This allows the saddle to be relocated without losing its shape, and when lifting the PWS5 before molding, it is sufficient to lift only the parts necessary for moving the cart 14.
The overall number of lifting points is smaller than in the past, making it possible to shorten working time and reduce the number of workers.Hereinafter, the structures of each of these jigs, carts, and molding machines will be described in detail.

FIG. 4 shows details of the idling roller type lifting jig 13,
The jig main body 13a suspended by the wire rope 10 has a gutter shape with an open top surface, and the bottom surface of the main body 13a has a
A drum-shaped horizontal roller 17 that receives the lower peripheral surface of the PWS 5 after being drawn out (before molding), and a total of four vertical rollers 1 that receive the regular portion peripheral surface of the PWS 5 on both front and rear sides with the horizontal roller 17 in between.
In the figure, 19 is a horizontal roller support member, 20 is a vertical roller support plate, and 21 is a notch for locking the wire rope 10. However, the suspension structure using the wire rope 10 is
Instead of lifting from the bottom of the figure, it may be suspended from the upper side of the jig main body 13a.

The support of the PWS 5 by the vertical and horizontal rollers 19 and 1B, coupled with the free rotation of each roller 18 and 19, allows the PWS 5 to be supported by the vertical and horizontal rollers 19 and 1B.
The binding force on the wire is weak, and the PWS in the forming machine 15 is
According to the forming of the rectangular cross section of 5, the difference in length between the strands can be easily fed to the other end, and the lifting position can be moved very smoothly and easily.

5, 6.7 show the detailed structures of the movable cart 14, the vibration molding machine 15, and the roller type deformation prevention jig 16, and FIG. 16
The PWS 5 on the pull-out roller 4 on the cat walk 3 is lifted up by two or three of the above-mentioned idling roller type lifting jigs 13, and one end of the tower top saddle 2 ( After molding the PWS 5 into a rectangular (rectangular) cross-section using a vibration molding machine 15 that is not set on the moving cart 14, a roller type deformation prevention jig 16 is attached to one end of the vibration molding machine 15 at the connecting part. 26 etc., and when the vibration molding machine 15 is started and reaches the movable dolly 14 mounted on the left end of the saddle 2, the molding machine 15 is set on the dolly 14 and integrated, and from then on, the movable dolly 14 along the upper part of the saddle, the vibration molding machine 15 and the roller type deformation prevention jig 16 are moved in the molding transfer direction Q.
The P molded by the molding machine 15 is
The WS5 passes through the jig 16 and is inserted into the required groove 2a of the saddle 2.
They will be relocated and turned over one after another.

The vibration molding machine 15 itself has the same internal structure as the conventional one, and although the details are omitted, the roller type deformation prevention jig 16 that follows it has the structure illustrated in FIG. 6. It is something.

That is, the jig main body 16a has a gutter-shaped cross section with an open top surface, and taking into account the fall due to the weight of the PWS 5,
It has a gutter shape that is curved in an arc over the entire length direction, and inside thereof there is a horizontal roller 22 that receives the bottom curve of the molded PWS 5, and a total of 4 rollers that receive the circumferential surfaces of both measurement parts of the PWS 5 with the horizontal roller 22 in between. A plurality of sets of prevention rollers made up of vertical book rollers 23 are arranged in line at appropriate intervals, and each roller 22.
23 are mounted on shafts so as to freely rotate, and a tracing material 24 for tracing inside the groove 2a of the saddle 2 is provided protruding from the bottom end of the main body 16a.

At this time, the trace material 24 is set to a height that does not hit the spacer 25 embedded in the saddle 2 in advance. A molding machine 15 is installed in the tool 16 as shown in the figure.
The molded PWS 5 is guided and sent out via the vertical and horizontal rollers 23 and 22, so that it is reliably prevented from deforming until it fits into the intended groove 2a of the saddle 2, and is smoothly and reliably formed. It will be housed in the groove 2a.

In connection with the connection between the molding machine 15 and the jig 16 by the connection part 26, the connection part 26 is of a universal joint type that can be rotated vertically and horizontally according to the rotatable cart set of the molding machine 15, as described later. shall belong to.

The movable cart 14 carrying the vibration molding machine 15 and the deformation prevention jig 16 is movable over the upper edge of the opening of the saddle 2 from one end of the saddle to the other end, and its detailed structure is shown in FIG. As shown in the example, the main body 14a of the movable cart 14 has a length extending in the width direction of the saddle 2, and has caster set wheels 27, 27 that are engaged with the upper opening edges 2b, 2b of the saddle 2. The caster set wheels 27, 27 are provided on both sides, and considering the application to the spray saddle, the caster set wheels 27, 27 are mounted on the trolley main body 1 as shown in FIG.
It is preferable that the vibration molding machine 15 is slidably attached to the long sliding groove 28 provided in the carriage body 14a and is movable in the direction perpendicular to the bridge axis (perpendicular to the saddle). At the same time, the molding machine 15 is also
In order to enable horizontal rotation up to approximately 20 degrees,
As shown in FIG. 2, a molding machine moving and fixing long groove 29 with a detachment notch 29a is provided on the main body 14a side, and a pin shaft 15a on the molding machine 15 side, for example, is engaged with this groove in a detachable and fixable manner. By forming the notches 29a at several locations in the longitudinal direction of the long groove 29, it is possible to move and fix the molding machine 15 in several steps in the direction perpendicular to the bridge axis, and sliding fixation using the pin shaft 15a or the like is not possible. Use an appropriate fastening method.

In FIG. 7, reference numeral 2C indicates a reinforcing rib of the saddle, and reference numeral 30 indicates a stiffener on the truck body 14a.

As described above, in the present invention, the PWS 5 pulled out on the pulling roller 4 of the cat walk 3 is lifted above the saddle 2, and is formed into a rectangular cross section by the vibration molding machine 15, and then placed in a predetermined position in the saddle 2. A series of relocation operations into the groove 2a can be carried out very easily, smoothly and quickly without the difficulties unlike the conventional methods.

That is, in the present invention, since the drawn PWS 5 before molding is lifted by the lifting jig 13 supported by the idle rollers 17 and 18, the restraining force on the PWS wire is small.
During molding, the difference in length between the strands can be easily transferred to the other end, allowing smooth movement of the lifting position, and the number of lifting points can be reduced compared to the conventional method.

In addition, vibration molding by the vibration molding machine 15, PW after molding
When storing the S5 in the saddle 2, the vibration molding machine 15 is set on a movable cart 14 that can run along the saddle 2,
Since the roller-type deformation prevention jig 16 is connected to the molding machine 15 and the molded PWS'5 is stored in the saddle 2, the molding work can be made extremely smooth and quick, and the number of lifting and hanging points for the PWS'5 can be reduced. At the same time, the number of required workers is smaller than before, and there is no shape shift of the PWS after molding, and the molded shape can be stably maintained, making the relocation work of PWS with an accurate molded shape more efficient. It is excellent for those who do well.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram of the conventional PWS retraction and lifting method, and Fig. 2 1. II is an explanatory diagram of the conventional relocation method, FIG.
V is an explanatory diagram of an embodiment of the relocation method according to the present invention, FIG. 3 is a comparative explanatory diagram of the PWS lifting means according to the conventional method and the present invention, and FIG. 4 is a detailed diagram of the embodiment of the idle roller type lifting jig of the present invention. , FIG. 5 is an explanatory diagram of an embodiment of the relocation method of the present invention, FIG. 6 is a detailed diagram of an embodiment of the same roller type deformation prevention jig, and FIG. 7 is a detailed diagram of an embodiment of the same moving trolley. 1...Tower top vent frame, 2...Tower top saddle, 3
...Cat walk, 4...Drawer roller, 5.
...PWS, 13... Idle roller type lifting jig, 14
...Moving trolley, 15...Vibration molding machine, 16...Roller type deformation prevention jig.

Claims (1)

[Claims] 1. A parallel cable strand pulled out on a pull-out roller installed on a catwalk is moved from above the roller to the saddle near the tower top saddle, and while being formed into a predetermined cross-sectional shape, When relocating to the designated location, the unformed parallel wire cable strand pulled out on the pull-out roller is lifted up by a group of lifting jigs that have a support surface using idler rollers, and the strand can be freely run onto the tower top saddle. A vibration molding machine set on a movable trolley mounted on the machine forms the desired cross-sectional shape, and the formed parallel cable strand is connected to the vibration molding machine so that it can move along with the machine, and supports the bottom and both sides of the strand. A method for transferring a parallel cable strand to a saddle, the method comprising: transferring a parallel cable strand to a predetermined position within the saddle via a deformation prevention jig having a plurality of roller groups arranged. 2 An idling roller type lifting jig in which a plurality of idling rollers that support the circumferential side of a parallel cable strand before forming are combined vertically and horizontally in a jig main body that is held movably up and down by a lifting wire rope, etc. In order to form the unformed parallel cable strand lifted by the jig into the desired cross-sectional shape, a movable trolley is mounted on the top surface of the opening of the tower top saddle so that it can run freely along the length of the saddle. a vibration shaping machine attached to the vibration shaping machine, and a plurality of support roller groups connected to one end of the vibration shaping machine, movable within the saddle, and supporting the bottom and both side surfaces of the shaped parallel wire cable strand. A device for transferring parallel wire cable strands to a saddle, which is characterized by preventing deformation prevention jigs arranged in rows.