JPH062312A - Method and apparatus for drawing cable of cable stayed bridge - Google Patents

Abstract

PURPOSE:To permit a center hole jack for adjusting cables to be assembled on a protection work moving by utilizing the space under the bridge girder. CONSTITUTION:A cable-drawing device 5 incorporated integrally with a center hole jack 14 in a freely adjustable manner is set on a protection work 4 hung down from a girder 1 under construction, and a cable 29 is passed through the jack 14 positioned by the device 5. Afterwards, the jack 14 is set on the girder l under construction for drawing operation of the cable 29.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cable pulling-in method applied to the construction of a cable-stayed bridge and its apparatus.

[0002]

2. Description of the Related Art A conventional cable pull-in method for a cable-stayed bridge is, for example, as shown in FIGS. 10 to 12, a rough terrain crane or a crawler crane 02 is mounted on a bridge surface 01 of a bridge girder under construction, and the cable pull-in or the crane 02 is used. Moves the center hole jack equipment 03 for adjusting the cable tension on the bridge surface and suspends it from the bridge surface opening 04 at the cable fixing position. The cable fixing position has different cable inclination angles, and stiffeners are incorporated, and since it is the smallest opening from the strength of the girder, the center hole jack equipment 03 hung by various cranes under the opening is chained. A block or a pulley or a winch 05 was used to re-arrange and set it at a predetermined position.

[0003]

However, since the cable-stayed bridge has a structure in which the bridge girders on both sides are supported by cables from the main tower built in the center to maintain left-right balance, cable entry and girder construction After closing and adjusting the cable tension at the completion of bridge work, etc., the center hole jack equipment for cable adjustment must be reset at each cable anchoring position for at least 3 times of the above-mentioned construction period, and therefore it is a strict problem. Position adjustment as a heavy object in the place was a difficult technique in terms of labor and safety, and it was also non-modern and inefficient in terms of efficiency.

The present invention was developed in order to address such a problem, and an object thereof is to enable an assembly on a protective work that moves using a space under a girder.

[0005]

In order to achieve the above object, a cable pulling-in method of the present invention is to attach a hoist rail to a girder under construction, and to suspend a protector on a hoist running on the hoist rail. , Installing a cable retracting device in which the center hole jack is freely integrated into the protective work, passing the cable through the center hole jack positioned by the cable retracting device, and then installing the center hole jack It is characterized in that it is installed on the girder and the cable is pulled in.

[0006] The apparatus has a fixed frame fixed to a guard attached to a girder under construction, a rotary frame rotatably supported by a pin on the fixed frame, and orthogonal to a lower portion of the rotary frame. Bottom sheath pipe fitted inside and fitted with a sliding inner pipe, a push-up sheath pipe fitted inside the bottom sheath pipe and fitted with a sliding inner pipe therein, and inside the push-up sheath pipe And a center hole jack fixed on the jack pedestal.

[0007]

According to the present invention, since the cable retractor is assembled on the moving protection work by utilizing the space under the girder by the above means, the assembling is facilitated, and once assembled, the girder is under construction, after the girder is closed, There is no need to relocate to each cable anchoring position at the completion of bridge work.

Therefore, the heavy machinery and labor required for the reassembling work are greatly reduced, and the process is greatly shortened and the safety is improved. In addition, the cable-stayed bridge makes the cables on the bridge girders on both sides of the main tower a good balance on the left and right, so it is easy to handle each cable fixing position and adjust the center hole jack when adjusting the cable tension during installation or during the construction process. Because of the left-right balance, repeated convergence is possible and the structural quality of the cable-stayed bridge is improved.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 to 9. Reference numeral 1 denotes a girder being erected, a hoist rail 2 is attached to the girder 1, and the hoist rail 2 is used as a rail. A protective worker 4 is suspended on the hoist 3.
Reference numeral 5 denotes a cable retracting device. The cable retracting device 5 includes a fixed frame 6 fixed to the armor 4, a rotary frame 8 rotatably supported by the fixed frame 6 via a pin 7, and the rotary frame. It is attached orthogonally to the lower part of 8,
And a bottom sheath pipe 10 into which the sliding inner pipe 9 is fitted, and a push-up sheath pipe 12 fitted into the sliding inner pipe 9 inside the bottom sheath pipe 10 to fit the sliding inner pipe 11 therein. The push-up sheath tube 12 includes a jack receiving base 13 attached to the sliding inner pipe 11 and a center hole jack 14 fixed on the jack receiving base 13, and the bottom sheath pipe 10 has a slit formed in the upper surface thereof. Rib plate 1 attached to the sliding inner tube 9 via
5, the push-up sheath tube 12 is attached to the sliding inner tube 9 via the rib plate 15, and the push-up sheath tube 12 is provided with the sliding inner tube 11 via a slit formed in the upper surface thereof.
A rib plate 16 attached to the bottom of the bottom sheath tube 1 is provided so that the jack receiving base 13 is attached to the sliding inner tube 11 via the rib plate 16.
0 is rotated around the pin 7 by the forward / backward movement of the screw bar 20 caused by the rotation of the electric action jack 19 interposed between the eye plate 17 at the bottom and the anchor beam 18 attached to the fixed frame 6, and the jack cradle. 13 is moved by the eye plate 21 at the bottom of the push-up sheath tube 12 and the bottom sheath tube 1.
The upper structure including the push-up sheath tube 12 can be moved in the left-right direction by the forward / backward movement of the screw bar 24 caused by the rotation of the electric action jack 23 interposed between the push-up sheath tube 12 and the anchor beam 22 attached to 0. The driving is performed by moving the screw bar 28 forward and backward by the rotation of the electric action jack 27 interposed between the eye plate 25 at the bottom of the jack pedestal 13 and the anchor beam 26 attached to the push-up sheath tube 12. It can be expanded and contracted. Reference numeral 29 in the figure denotes a cable.

Thus, the position adjustment of the center hole jack in the bridge axis direction can be adjusted by the movement of the guardian, and the adjustment in the direction perpendicular to the bridge axis can be adjusted by using the bottom sheath pipe, and the vertical height can be further adjusted. The direction can be adjusted by using the push-up sheath tube, and the elevation angle of the cable fixing position can be adjusted by using the rotating frame.When the center hole jack is positioned, the center hole jack can be Since it is tensioned through, it is pressed and fixed to the center hole jack support member (not shown) installed on the girder 1 being erected, so the edge is cut off from the guard 4 and the guard 4 is Power does not work.

[0011]

As described above, according to the present invention, the hoist rail is attached to the girder under construction, the hoist traveling on the hoist rail is hung on the protective work, and the center hole jack is adjustable on the protective work. Install a cable retracting device that is integrated in the cable, pass the cable through the center hole jack positioned by the cable retracting device, and then install the center hole jack on the girder under construction to perform the cable retracting work. This makes it easier to assemble the center hole jack, and once assembled, it is not necessary to relocate the cables to the cable fixing positions during girder erection, after girder closing, and when bridge surface construction is completed. Therefore, the heavy machinery and labor required for the reassembling work are greatly reduced, and the process is greatly shortened and the safety is improved.

Further, the cable retractor is provided with a fixed frame fixed to a guard installed on the girder under construction, a rotary frame rotatably supported by a pin on the fixed frame, and orthogonal to a lower part of the rotary frame. Bottom sheath tube which is attached to the inside of which the sliding inner tube is fitted, a push-up sheath tube which is attached to the sliding inner tube of the bottom sheath tube and which fits the sliding inner tube therein, and the push-up sheath. Since it consists of a jack pedestal attached to the sliding inner pipe and a center hole jack fixed on the jack pedestal, the position adjustment in the bridge axis direction, the position adjustment in the direction perpendicular to the bridge axis, and the vertical height The position adjustment in the vertical direction and the elevation angle adjustment of the cable fixing position can be performed, and all the position adjustments of the cable pull-in can be performed by absorbing all manufacturing errors and installation errors.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of the present invention.

FIG. 2 is a side view of FIG.

FIG. 3 is an enlarged view of a portion A of FIG.

FIG. 4 is a view taken along the line AA of FIG.

5 is a view taken along the line BB of FIG.

6 is a side view showing the rotating state of FIG. 3. FIG.

FIG. 7 is a drive explanatory diagram of FIG. 3;

FIG. 8 is a plan view of FIG.

9 is a side view of FIG. 7. FIG.

FIG. 10 is a side view showing a conventional example.

FIG. 11 is a perspective view showing a state of being suspended from a bridge surface opening of a conventional example.

FIG. 12 is a view taken along the line CC of FIG.

[Explanation of symbols]

 1 girder 2 Hoist rail 3 Hoist 4 Protective work 5 Cable retractor 6 Fixed frame 7 Pin 8 Rotating frame 9 Sliding inner pipe 10 Bottom sheath pipe 11 Sliding inner pipe 12 Push-up sheath pipe 13 Jack cradle 14 Center hole jack 29 Cable

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Koji Kawamoto 12 Nishiki-cho, Naka-ku, Yokohama-shi, Kanagawa Mitsubishi Heavy Industries Construction Yokohama Branch (72) Inventor Mitsuru Miyanaga 12 Nishiki-cho, Naka-ku, Yokohama-shi, Kanagawa Mitsubishi Heavy Industries Construction Yokohama branch office

Claims (2)

[Claims] 1. A hoist rail is attached to a girder under construction,
A protective work is hung on the hoist that travels on the hoist rail, and a cable retracting device in which a center hole jack is freely integrated is installed on the protective work, and a center hole positioned by the cable retracting device is installed. A cable retracting method for a cable-stayed bridge, characterized in that the cable is passed through the jack, and then the center hole jack is installed on the girder under construction to carry out the cable retracting work. 2. A fixed frame which is fixed to a guarder attached to a girder under construction, a rotating frame which is rotatably supported by the fixed frame via pins, and which is attached orthogonally to a lower portion of the rotating frame. A bottom sheath pipe having a sliding inner pipe fitted therein, a push-up sheath pipe attached to the slide inner pipe inside the bottom sheath pipe and having the sliding inner pipe fitted therein, and a slide inside the push-up sheath pipe. A cable retracting device for a cable-stayed bridge, comprising: a jack pedestal attached to the moving inner pipe and a center hole jack fixed on the jack pedestal.