JPH06136719A - Under-girder jack - Google Patents

Abstract

PURPOSE:To provide tension to a diagonal member in an arbitrary angle at an arbitrary scaffold by making a jack base and a jack mounted on the jack base movable. CONSTITUTION:A suspended frame body 4, which is hanging down from a guide rail 3 provided on the lower surface of a bridge girder 2 and made movable, is moved to a specified position. A movable truck 6 is then moved along a cross rail 5 and a jack 10 is arranged exactly in front of a diagonal member 1. A cylinder 8 is then extended and the angle of the jack 10 is adjusted. By doing so, 'the center line of the jack 10 is aligned with the position on the extension of the diagonal member 1. Thereafter, the diagonal member 1 is taken into the center hole of the jack 10, grasped and extended. Thus work can be accomplished safely even under a bad scaffolding girder and tensile strength can be applied to the diagonal member 1 from an accurate direction while adjusting the mounting angle.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of an under girder jack for tensioning a diagonal member of a cable-stayed bridge.

[0002]

2. Description of the Related Art In a cable-stayed bridge, as shown in FIG.
You need to be nervous for each book. For the tension work, install a jack with a considerable weight on the underside of the bridge girder,
You have to move sequentially. However, the lower surface of the bridge girder has a bad footing, and it is not easy to move heavy jacks one after another. In addition, depending on the structure of the cable-stayed bridge, the installation angles of the diagonal members and bridge girders may all be different, so it is necessary to change the tension angle of the jack for each tensioned position, and the adjustment is complicated. It was troublesome.

[0003]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and provides a girder jack which can be easily moved and installed even on the lower surface of a bridge girder with poor footing. With the goal. It is another object of the present invention to provide a girder jack that can easily change the angle and tension the diagonal member at an optimum angle even if the mounting angle is different for each diagonal member.

[0004]

[Means for Solving the Problems] That is, according to the present invention, a frame body that is suspended from a guide rail provided on the lower surface of a bridge girder and movable, and a floor surface of the frame body in a direction intersecting the guide rail. A cross rail provided, a moving carriage mounted on the cross rail, a tilting frame attached to the moving carriage so that it can be tilted up and down, a jack stand mounted on the tilting frame and movable, and a jack. It is a girder jack composed of a jack mounted on the table.

[0005]

The present invention will be described below with reference to the drawings. <B> Structure of bridge girder Through holes penetrating the diagonal member 1 are opened on both sides of the bridge girder 2. Therefore, two guide rails 3 are provided in parallel on the lower surfaces on both sides of the bridge girder 2, that is, the positions of the lower surfaces of the through holes.

<B> Suspended Frame Body A movable frame body 4 is suspended from the guide rail 3.
This suspension frame 4 is suspended by wheels in a monorail manner for each guide rail 3, and if some wheels are configured with a gear trolley, the suspension frame 4 can be installed along the guide rails 3. It can be moved. The suspension frame body 4 is a frame body composed of an upper frame, four columns and a floor.

<C> Mobile trolley A cross rail 5 is provided on the floor surface of the suspension frame 4. The cross rail 5 is provided in a direction intersecting the direction of the guide rail 3. A moving carriage 6 is mounted on the cross rail 5. This moving carriage 6 is a pedestal having wheels on its lower surface,
It is possible to drive on the cross rail 5 by a motor.

<D> Jack stand A tilting frame 7 is attached to the moving carriage 6 via a horizontal shaft. Therefore, the tilting frame 7 can be tilted up and down with respect to the moving carriage 6 around the horizontal axis. For this tilting operation, a telescopic cylinder 8 is installed between the moving carriage 6 and the tilting frame 7,
Further, the jack frame 9 is movably mounted on the tilting frame 7. The jack base 9 is mounted on the tilting frame 7 via wheels, and is moved on the tilting frame 7 by driving a motor installed at the rear end of the tilting frame 7. A jack 10 for tensioning the diagonal member 1 of the cable-stayed bridge is mounted on the jack base 9.
This jack 10 is a center-hole type jack 10 and has a structure in which a diagonal force is applied to the diagonal member 1 by gripping and extending the diagonal member 1 inside.

[0009]

Next, the operation of the above-mentioned girder jack will be described. <A> Movement of suspension frame 4 The suspension frame 4 which is movable by being suspended on the guide rail 3 provided on the lower surface of the bridge girder 2 is moved to a predetermined position for tensioning the diagonal member 1. . If you move along the guide rail 3,
It reaches almost the vicinity of the penetration position of the diagonal member 1.

<B> Movement of the moving carriage 6 On the floor surface of the suspension frame body 4, a cross rail 5 is provided in a direction intersecting with the guide rail 3, and the moving carriage 6 is mounted on the cross rail 5. I am doing it. Therefore, the moving carriage 6 is moved along the cross rail 5 and accurately arranged at the position in front of the diagonal member 1.

<C> Adjustment of tilt of tilting frame 7 Next, the tilting frame 7 attached to the movable carriage 6 so as to be tiltable.
The cylinder 8 is extended to adjust the angle. In this way, the center line of the jack 10 on the jack base 9 is set at a position on the extension of the diagonal member 1.

<D> Extension of Jack The diagonal member 1 is taken into the center hole of the jack 10 and is grasped and extended. As a result, the diagonal member 1 is given a tensile force in the correct direction. After applying a predetermined tensile force, the end portion of the diagonal member 1 is fixed by a predetermined means.

<E> Moving When the fixing at one place is completed, the tilting frame 7 is tilted to lower the entire height, and the suspension frame 4 is moved along the guide rail 3 to the next fixing place. Move to near. Thereafter, the same tension is applied to the diagonal member 1 in the same manner as described above.

[0014]

Since the down jack according to the present invention is as described above, the following effects can be obtained. <B> Work under girders with poor scaffolding can be performed safely and smoothly. <B> Since the direction, height, and angle of the heavy jack can be freely adjusted, it is possible to apply a tensile force to the diagonal member from the correct direction. <C> Even in a cable-stayed bridge of a type in which the angle of attachment to the bridge girder is different for each diagonal, accurate tension can be easily applied to each diagonal.

[Brief description of drawings]

FIG. 1 is a side view of an undercarriage jack of the present invention.

FIG. 2 is an overall perspective view

FIG. 3 is an explanatory diagram of a state of using

Claims (1)

[Claims] Claim: What is claimed is: 1. A frame body, which is suspended from a guide rail provided on the lower surface of a bridge girder, and movable, a cross rail provided on the floor surface of the frame body in a direction intersecting with the guide rail, and on the cross rail. It consists of a mobile trolley mounted on the vehicle, a tilting frame that can be tilted up and down with respect to this mobile trolley, a jack stand that can be mounted on this tilting frame and can be moved, and a jack that is mounted on the jack base. , Undercarriage jack