JP3143807B2 - Cable-stayed bridge structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cable-stayed bridge structure.

[0002]

2. Description of the Related Art In a cable-stayed bridge made of prestressed concrete, the largest load factor is its own weight. Therefore, if the weight is reduced, the design becomes very advantageous. For this reason, in a cable-stayed bridge having a wide width, a method has been devised to reduce the thickness of the upper floor slab by arranging cross beams in the transverse direction on the lower surface of the floor slab.

[0003]

In the conventional method, however, even if the thickness of the upper deck can be reduced by arranging the cross beams, the own weight of the cross beams increases, so that the overall weight is eventually reduced. Is not very effective.

[0004]

SUMMARY OF THE INVENTION The object of the present invention is to solve such a conventional problem, and to provide a cable-stayed bridge structure capable of greatly reducing the overall weight compared to the conventional cable-stayed bridge. The purpose is to provide.

[0005]

That is, the present invention relates to a cable-stayed bridge made of prestressed concrete, in which a cross beam is arranged in the transverse direction on the lower surface of a prestressed concrete floor slab, and the cross beam is made of a high-strength steel or the like. This is the structure of a cable-stayed bridge made of materials. Further, the present invention is a structure of a cable-stayed bridge in which a fixing member for fixing a diagonal member is integrally attached to a cross beam arranged on a lower surface of a prestressed concrete floor slab.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. <A> Arrangement of cross beams The present invention is directed to a prestressed concrete cable-stayed bridge. In such a cable-stayed bridge, a high-strength cross beam 1 is arranged transversely on the lower surface of a prestressed concrete floor slab 2.

<B> Constructed of high-strength material The high-strength cross beam 1 is formed, for example, in an H-shaped cross section. In the present invention, the cross beam 1 is made of a high-strength material. The high-strength material is, for example, a steel material.
In this high-strength cross beam 1, a large number of reinforcing holes 3 are previously opened for the placement of reinforcing steel and PC steel material inside the beam.

<C> Mounting of anchor structure Floor plate 2 made of prestressed concrete as described above
An anchor structure for fixing a diagonal member is integrally attached to the high-strength cross beam 1 arranged on the lower surface of the slab. The anchor structure is, for example, a member such as a casing pipe 4 for inserting a PC steel wire or a steel rod, or a fixing plate 5 for fixing. Even if such a member has a complicated shape, the high-strength cross beam 1 is made of steel or the like, so that the member and the high-strength cross beam 1 can be easily integrated by welding or other work, and accurate. It is extremely easy to install at various positions and angles.

<D> Installation of high-strength cross beam 1 At the time of actual erection, a high-strength cross beam 1 integrated with an anchor structure manufactured in a work yard of a factory or a site is transported to the site, and a crane or the like is used. Is set at a predetermined position. Thereafter, a reinforcing bar is arranged, a formwork is set around the reinforcing bar, concrete is poured, and the high-strength cross beam 1 and the concrete are integrated. Even when the anchor structure such as the casing pipe 4 is arranged at a complicated angle, it can be firmly installed at an accurate angle and an accurate position, so that the position does not shift even after the concrete is poured. , Fixed in exact position, angle. Therefore, the subsequent attaching work and fixing work of the oblique material can be performed very easily and quickly.

[0010]

The structure of the cable stayed bridge according to the present invention is as described above, and the following effects can be obtained. <B> The weight of the high-strength cross beam 1 can be significantly reduced as compared with the case where the high-strength cross beam 1 is manufactured from concrete. Therefore, the thickness of the upper slab 2 of the main girder can be reduced by using a large number of lightweight high-strength cross girders 1, and the thickness of the entire cable-stayed bridge can be significantly reduced. <B> The fixing portion of the oblique material can be integrated with the high-strength cross beam 1 at the factory in advance. Therefore, the accuracy of the construction is improved. In particular, in the cable stayed bridge, the angle of the angle and the position are complicated because the slab of the diagonal material and the mounting part of the diagonal material intersect at a certain angle, but since they can be installed with high accuracy in advance, The effect is remarkable. <C> Conventionally, the production of the cross beam 1 has greatly affected the shortening of the process. However, in the structure of the present invention, since the process of manufacturing the cross beam 1 does not become a determining factor of the entire process, the process can be shortened. <D> When the cross beam 1 is made by casting in place in concrete, it takes a great deal of trouble to install the formwork and set the anchors for reinforcing bars and diagonal materials inside. However, in the structure of the present invention, since the concrete cross beam 1 is not used, the trouble is not required, and the process can be greatly reduced.

[Brief description of the drawings]

FIG. 1 is an explanatory view of the structure of the present invention.

FIG. 2 is a front view thereof.

FIG. 3 is a side view thereof.

Claims (2)

(57) [Claims] 1. A cable-stayed bridge structure comprising: a prestressed concrete cable-stayed bridge; a cross beam is disposed transversely on a lower surface of a prestressed concrete floor slab; and the cross beam is made of a high-strength material such as steel. 2. A structure of a cable stayed bridge in which a pipe and a fixing plate for fixing a diagonal member are integrally attached to a cross girder arranged on a lower surface of a prestressed concrete floor slab.