JP2808239B2 - Hollow frame for hollow prestressed concrete bridge girder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hollow frame of a prestressed concrete bridge girder formed in a hollow, and more particularly to an improvement in the shape of a general-purpose hollow frame capable of coping with various specifications.

[0002]

2. Description of the Related Art Conventionally, in forming a hollow prestressed concrete bridge girder, a detailed description will be given with reference to the drawings. The steel wire (1) is housed in a predetermined position in a mold (2) to be molded, filled with concrete (3) and solidified, and a hollow frame (4 ') as shown in FIG. A built-in bridge girder is obtained, and a plurality of the obtained bridge girder are arranged as a structural material of the bridge. Hollow frame (4 '), which is a lightweight core used in this type of concrete bridge girder
In this method, a foam such as styrene foam is molded into a desired core material shape, and a hollow shape and strength corresponding to each requirement are adapted.

[0003]

However, as described above, the hollow frame (4 '), which is a lightweight core material, has a hollow shape and a length dimension corresponding to each strength requirement, and is integrally formed with a foam for each size. The molding is inferior in general versatility, so that the molding cost is high, and as described above, there is a drawback that the integral molded article is extremely inferior in handleability, transportability and storage stability. SUMMARY OF THE INVENTION The present invention has been made in view of the above-described drawbacks, and provides a hollow frame structure in which a lightweight core material is divided and formed as needed to form a concrete bridge girder.

[0004]

SUMMARY OF THE INVENTION The present invention, as shown in FIG. 1, relates to a lightweight core for forming a hollow prestressed concrete bridge girder, namely a hollow frame (4).
As shown in FIG. 2, the steel wire (1) is inserted into the form (2) together with the concrete (3), and the concrete (3) is filled and solidified. The concrete panel (5) is inserted into the recess (41) provided at the top. ) the placed was top, middle frame and (4b) an intermediate plate (4c)
It is characterized in that the lower middle frame (4a) and the lower middle frame (4a) are substantially integrated by a binding band.

[0005]

In general, hollow prestressed concrete bridge girder is adjusted only by the girder height without changing its width within a certain range in order to satisfy the required strength. Therefore, lightweight core material that forms a hollow shape The present invention is based on the insight that the width and the shape can be changed by changing the height without changing the width and shape. According to the present invention, as described above, a concrete (3) is housed in a mold (2) to be molded together with a desired number of steel wires (1), and the concrete (3) is formed.
A hollow frame (4) made of a foam which is filled and solidified into a hollow prestressed concrete bridge girder,
As shown in FIG. 1, a lower middle frame (4a) having a substantially inverted triangular cross section and a recess (4) for accommodating a concrete panel (5) at the top.
The concrete panel (5) is composed of an upper middle frame (4b) having a substantially trapezoidal cross section provided with 1).
Arranged with the upper, middle frame (4b) and Shitachu frame (4a) intermediate to the desired insert the plate member (4c) having a thickness of tying these bands of (shown
( Not shown) and are inserted into the formwork (2).

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In manufacturing a hollow prestressed concrete bridge girder, as shown in FIG. 1, a lower middle frame (4a), an intermediate plate (4c), an upper middle frame (4b) and a concrete panel (5) are bound by a binding band. A hollow frame (4) is formed by being substantially integrated, and as shown in FIG. 2, together with a required number of steel wires (1), it is placed and fixed in a mold (2), and then concrete (3) is poured. Consolidate. After this consolidation, the formwork (2) is removed to complete the hollow prestressed concrete bridge girder. At this time, the concrete panel (5) arranged in the concave portion (41) of the upper middle frame (4b) is filled together with the steel wire (1) placed on its upper surface as shown in FIG. The hollow frame (4), whose floating position is to be changed, is kept at an accurate position, and a hollow shape without deformation at the accurate position and sufficient design strength are promised.

Next, in the actual dimension setting, for example, the hollow frame (4) has a girder height of 425 mm to 800 mm.
The height of the plate (4c) inserted between the lower middle frame (4a) and the upper middle frame (4b) is set at a height of about 195 mm to about 570 mm. , 25 mm to about 375 mm. In the integration of the hollow frame (4), as shown in FIG. 2, an upper middle frame (4b) in which a concrete panel (5) is arranged in a concave portion (41) at the top,
The intermediate plate (4c) and the lower middle frame (4a) are connected to a desired portion (for example, 1230 m) with a binding band (not shown).
(about three places with respect to the length dimension of m). This binding band may be a tape-shaped adhesive band. In the above-mentioned girder heights, the girder length of the hollow frame (4) has a length of about 2800 mm to 3700 mm, and a plurality of the hollow frames (4) are embedded in the length direction to reduce the required length. Long bridge girder.

[0008]

According to the above configuration, the following excellent effects can be obtained. According to the hollow frame (4) of the present invention, it is possible to cope with various shapes by using one molding die and changing the intermediate plate (4c) each time.
In c), it is sufficient to change the thickness dimension, so that the versatility is high and the hollow frame (4) of each dimension can be provided at very low cost. Further, the divided structure of the hollow frame (4) greatly improves not only the handling property but also the storage property and the freight or transportability.

[Brief description of the drawings]

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

FIG. 2 is a sectional view showing a state in which the present invention is implemented.

FIG. 3 is a sectional view showing a conventional structure not using the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Steel wire 2 Form frame 3 Concrete 4 Hollow frame 4a Lower middle frame 4b Upper middle frame 4c Plate material 41 Depression 5 Concrete panel 4 'Conventional hollow frame

Claims (1)

(57) [Claims] 1. A hollow frame made of a foam for housing together with a desired number of steel wires in a form to be molded, and filling and solidifying concrete in the form to form a hollow prestressed concrete bridge girder. A cutout with a recess at the top to accommodate the concrete panel
An upper middle frame with a substantially trapezoidal surface and a lower middle frame with a substantially inverted triangular cross section
And an intermediate plate inserted between the upper and lower middle frames.
Ri, the upper, middle frame arranged concrete panel to said recessed portion, said intermediate plate member, said Shitachu frame and a hollow hollow prestressed concrete girder which is characterized in that allowed to integrate tied desired location at Ties frame.