JP2556818B2 - Tensioning method for PC steel in prestressed concrete triangular member - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for tensioning a PC steel material in a prestressed concrete triangular member.

[0002]

2. Description of the Related Art Conventionally, the lining plate has a quadrangular shape in plan view, and if the two supporting beams supporting the lining plate are out of level, the lining plate cannot be supported at four points. , Because the vehicle traveling above the lining plate causes rattling,
It has been proposed to use a triangular lining version.

However, in this construction method of a prestressed concrete triangular member, PC steel materials are linearly arranged on each side of the triangle, fixing members are provided at both ends, and a tension jack is used to introduce prestress. One fixing device is required at both ends.

However, the large number of fixing devices has drawbacks such as obstacles at the time of assembling members and production costs, and the linear arrangement impairs (cuts) the prestress continuity. There are drawbacks.

[0005]

Therefore, the present invention has been invented to eliminate the above-mentioned drawbacks, and by reducing the number of fixing tools used for manufacturing, obstacles at the time of assembling members and production costs are reduced. The purpose of the present invention is to develop a method of tensioning a PC steel material so that it is inexpensive, and the continuity of prestress is not impaired, and even stress is applied.

[0006]

According to the present invention, in a prestressed concrete triangular member, a V-shaped P is formed in a portion that straddles both right and left sides around each vertex of the triangle.
After arranging C steel material, placing concrete, and confirming the specified strength development, PC steel material is applied so that even stress is sequentially applied by pulling or pulling from the apex of one triangle to the right or left. Consists of how to strain.

[0007]

[Function] PC steel material is arranged in a V shape for all three vertices so as to straddle two sides on both sides with one vertex of the triangle as the center, so that the number of fixing tools becomes smaller than that of the linear arrangement. PC steel is placed and tensioned.

[0008]

EXAMPLE An example of the present invention will now be described with reference to the drawings. Prestressed concrete triangular member (1)
In, the V-shaped PC steel materials (2), (3), and (4) are arranged in the portions that straddle both the left and right sides around the vertices (A), (B), and (C) of the triangle.

Then, the PC steel materials (2), (3) and (4) are arranged such that two pieces are provided on each side of the triangular member at appropriate intervals.

For example, the PC steel material (2) is arranged so as to be located outside the cross section with respect to the side AB and inside the cross section with respect to the side BC, and is curved in an arc shape at the vertex B. The fixing tools (5) and (6) are attached to both ends.

Similarly to the above, the PC steel material (3) is attached to the fixing tools (7) and (8), and the PC steel material (4) is also attached to the fixing tools (9) and (10).

Then, after arranging, concrete is placed and cured to a predetermined strength. Then, if a predetermined strength is developed, a tension jack (not shown) is attached to the fixing tools (5) and (6) for the PC steel material (2), and the PC steel material (2) is rotated clockwise with respect to one apex of the triangle, or In the counterclockwise direction, the PC steel material is tensioned so that even stress is sequentially applied by both pulling or pulling, and the necessary prestress is introduced.

Similar to the above, the PC steel materials (3) and (4) are strained in the same order as the PC steel material (2).

Incidentally, concrete notches (11), (12) and (13) are provided at each vertex of the triangular member (1),
(14), (15) and (16) are corner chipping prevention fittings.

Further, the triangular member (1) may have a hollow surface on one side or may be hollow.

Furthermore, after placing concrete and confirming that a predetermined strength is exhibited, a PC steel material is applied so that even stress is applied sequentially by pulling or pulling from the apex of one triangle to the right or left. Composed of a tense way.

[0017]

According to the present invention, the PC steel material is dealt with by eccentricity in the vertical direction from the center of the sectional view with respect to the loaded load. At this time, since the PC steel material is arranged in a curved line (V-shape), Compared with the linear arrangement, compressive stress can be introduced toward the triangular centroid, and this stress exerts uniform compressive stress on the entire plate by tensioning all three vertices, which has a high toughness and a crack prevention effect. It enables the production of concrete slabs, and the triangular slab has the effect of absorbing the strain due to three-point support at the same time with respect to horizontal strain generated by repeated loading, and at the same time not causing rattling even by a vehicle running on the plate, Furthermore, the V-shaped arrangement of PC steel is
Compared to the linear arrangement, the number of anchors is reduced, workability and economic efficiency can be improved. This prestressed concrete triangular member is used alone or in combination, and building structures such as roofs and floors, lining plates Of course, it has extremely useful effects such as being applicable to civil engineering structures such as slope protection materials.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing an embodiment of the present invention.

2A and 2B are side views showing another embodiment of the present invention.

[Explanation of symbols]

 1 triangular member 2 PC steel material 3 PC steel material 4 PC steel material 5 Fixing tool 6 Fixing tool 7 Fixing tool 8 Fixing tool 9 Fixing tool 10 Fixing tool 11 Concrete notch 12 Concrete notch 13 Concrete notch 14 Corner chipping preventive 15 Corner chipping Preventive metal fitting 16 Prevention of corner chipping

Claims (1)

(57) [Claims] 1. In a prestressed concrete triangular member, a V-shaped PC steel material is placed in a portion that straddles both left and right sides centering on each vertex of the triangle, and is concrete-cast to achieve a predetermined strength development. After confirming, the PC steel material in the prestressed concrete triangular member is characterized in that the PC steel material is tensioned so that even stress is sequentially applied from the apex of one triangle to the right or left by pulling or pulling. How to get nervous.