JPS649405B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for constructing bridges, buildings, and other elevated structures supported by girders using a prestressing method.

To construct a long bridge using this method, for example, a movable scaffold called a Vallbauwagen is used, and the Wagen has two diamond-shaped trusses called main trusses, on which cross beams are stretched and fixed. The wagon is moved along the rails laid on the deck of the existing bridge body, supporting the weight of concrete, etc., and the wagon is used to perform work such as installing formwork, pouring concrete, introducing prestressing, etc., and adding floor plates. We will proceed sequentially.

The Volkswagen suspends a large load, such as the weight of concrete, and the bridge body that supports it is subject to a considerable load. Therefore, rails are usually laid on the existing floorboards where the bridge girders are located, so that the weight of the concrete suspended by the wagons is directly supported by the bridge girders.

In this case, if the long bridge is a straight one, rails are laid in a straight line on the existing deck along the bridge girder,
As the work progresses, it is possible to construct a long bridge by moving the wagon and adding floor plates, but in the case of a long bridge that is curved or has a change in width, the position of the bridge girder will also be curved accordingly. Alternatively, the width may change, and the conventional construction method using the wagon cannot adequately deal with it, and the wagon may have to be supported on a floor plate other than the bridge girder, or the wagon may be repaired each time to cope with this. and so on.

The present invention was made to eliminate the drawbacks of conventional construction methods, and consists of laying rails on the existing floorboards on which the girders of elevated structures are located, and installing a pair of left and right main trusses that can move along the rails. In the construction method of elevated structures, cross beams are fixed across the main truss to support the weight of concrete, etc., and the main truss is moved one by one to add floor plates.
One main truss and cross beam are connected with pins so that the main truss and cross beam can rotate relative to each other in a horizontal plane, and the other main truss and cross beam are connected with pins so that the main truss and cross beam can rotate relative to each other in a horizontal plane. At the same time, the main truss and the cross beam are slidably connected so that they can move relative to each other in the horizontal direction on a horizontal plane,
The lateral and angular displacements between the main truss and the cross beams caused by changes in the girder spacing are absorbed by the relative movement and rotation between the main truss and the cross beams, thereby ensuring that the weight of concrete is always directly supported by the girders. This allows the addition of floorboards.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The implementation of the present invention will be described below with reference to the drawings, taking as an example a case where a long bridge is constructed by the construction method of the present invention.

In Figure 1, 1 is the existing bridge body part, and the illustrated example shows a case where the bridge width is gradually wider than the standard bridge width, and the spacing between the bridge girders 2a and 2b is also the same as the standard bridge width. The digit spacing is wider than the case. Rails are laid on the existing floorboard 3 on which the bridge girders 2a, 2b are located, and a forbauwagen, ie, a movable scaffolding, generally designated 4, that moves along the rails is provided.

The wagon 4 has a pair of left and right main trusses 5a and 5b that are movable along the rails, and a main truss 5.
Cross beams 6, which are fixed across a and 5b, and on which the work scaffold is suspended and support the weight of concrete, etc.
6. It consists of a jack to move the wagon.

The main truss 5a and the cross beams 6, 6 on one side are connected by pins 7 so that the main truss 5a and the cross beams 6, 6 can rotate relative to each other in a horizontal plane, and the main truss 5b and the cross beams 6, 6 on the other side are The main truss 5b and the cross beams 6, 6 are connected by pins so that they can rotate relative to each other in a horizontal plane, and the main truss 5b
and the cross beams 6, 6 are slidably connected so that they can move relative to each other in the lateral direction on a horizontal plane.

FIG. 2 shows an example of a shoe used to connect the main truss 5b and the cross beams 6, 6. The shoe, generally designated 8, has a base plate 9, which is fixed to the main truss 5b (FIG. 1) by passing bolts through holes 9a, . . . formed therein. A rotating plate 1 that rotates around a pin 10 erected on the main truss 5b is mounted on the base plate 9.
1 is provided, and the rotating plate 11 is provided with spaces 11a, 11a for the transverse beams in which the transverse beams 6, 6 engage and slide laterally.

Figure 3 shows the space 11 for the horizontal beam of the rotating plate 11.
A and 11a (FIG. 2) show the state in which the cross beams 6 and 6 are set. In this figure, the cross beams 6, 6 are shown as being slightly shorter than the actual cross beams.

FIG. 4 shows a hydraulic jack, generally designated 12, for moving the main truss 5b and the cross beam 6 relative to each other in the lateral direction. The cylinder 13 of the hydraulic jack is fixed to the main truss 5b by a mounting plate 15, and the piston 14 is fixed to the cross beam 6 by a mounting plate 16. In addition, Jyatsuki 12
The mounting plates 15 and 16 are positioned so that they do not interfere with the relative movement between the main truss 5b and the cross beam 6, that is, in the vicinity of the shoe 8, and do not interfere with the rotational movement of the rotary plate 11 and the sliding movement of the cross beam 6. installed in such a position.

As shown above, the main truss 5
b and the cross beam 6 can be moved laterally relative to each other in the horizontal plane by the action of the jack 12 and the shoe 8, and can also rotate relative to each other in the horizontal plane.

Figure 5 shows the displacement that occurs during construction from point A to point B. At point A, a displacement angle θ is generated between the main truss 5b and the cross beam 6, but when it moves to point B. Then, the rotation is made to the displacement angle θ', and the position of the cross beam 6 is moved to the left by l.

In this way, the girders 2a and 2b widen (narrow) during movement, and therefore the rails widen (narrow).
The displacement angle caused by the rotating plate 1 of the shoe 8 is
1 rotation, and lateral displacement is absorbed by sliding the cross beam 6 placed on the shoe 8 using a hydraulic jack 12.

As explained above, according to the present invention, even if the girder spacing changes, large loads such as the weight of concrete can always be directly supported by the girders. It does not have a negative impact on the

[Brief explanation of drawings]

FIG. 1 is a plan view showing how the floorboards of a long bridge, whose width is gradually increasing, are being joined using a Folbauwagen. FIG. 2 is a perspective view of a shoe that absorbs rotation and lateral movement. FIG. 3 is a perspective view showing the relationship between the cross beam and the shoe. FIG. 4 is a perspective view of a jack that moves the main truss and the cross beam relative to each other. FIG. 5 is an explanatory diagram showing the relationship between the amount of angular displacement and the amount of lateral movement between the main truss and the cross beam. 1... Existing bridge body part, 2a, 2b... Bridge girder,
3...Floorboard, 4...Forbauwagen, 5a,
5b...Main truss, 6...Horizontal beam, 7...Pin connection point, 8...Shoe, 9...Base plate, 10
... Pin, 11 ... Rotating plate, 11a ... Space for horizontal beam, 12 ... Hydraulic jack, 13 ... Cylinder, 14 ... Piston, 15, 16 ... Mounting plate.

[Claims]

1. In a method of sequentially constructing an elevated structure using a wagon, the wagon is composed of at least two main trusses, at least one frame, and first and second beams, and each main truss is attached to a planar framework. The main truss, pedestal, and both beams are separate bodies, and when moving the wagon, first support both beams with the pedestal, move the main truss forward along the rail, and then move the pedestal forward. A construction method for elevated structures characterized by fixing beams to the main truss.