JPH05272197A - Prestressed concrete member - Google Patents

Abstract

PURPOSE:To increase toughness of a part which is easily collapsed by imbedding a reinforcing body, obtained by filling a solidification agent in a cylinder in which spiral reinforcing bars are brought into close contact with each other, in a joint end section of the main body of a prestressed concrete member. CONSTITUTION:First, a pressure bearing plate made of steel is welded to the lower end of a cylinder, in which spiral reinforcing bars are brought into close contact with each other at adequate intervals, and solidification agent such as high strength concrete, mortar, cement paste, and plaster is filled in this cylinder to form a reinforcing body 4. Next, four reinforcing bodies 4 are imbedded in the lower section of the prestressed concrete column 2 made by precast, and two reinforcing bodies 4 are imbedded in the projection of the joint section with a beam. Then, two reinforcing bodies 4 are imbedded in the upper part and lower part of both the joint sections of the prestressed concrete beam 3 made by precast. A diameter, and imbedding number and place of these reinforcing bodies 4 are arbitrarily determined in accordance with the size of the prestressed concrete column 2 and beam 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a prestressed concrete member such as a prestressed concrete column or a prestressed concrete beam.

[0002]

2. Description of the Related Art In recent years, construction materials such as columns and beams are precast and assembled on site to improve the workability of concrete structures and compensate for labor shortage. Furthermore, a prestressed concrete structure is constructed by using a prestressed concrete member in which strength is increased by prestressing the precast column or the precast beam.

[0003]

However, since such a prestressed concrete structure is a structure which gives a compressive stress to concrete, it has high strength but low toughness. This is because the strength of the PC steel material is large and the concrete on the compression side collapses before the PC steel material yields due to the action of the compression axial force, and this tendency tends to cause the prestressed concrete supporting the weight of the building. The pillar is more remarkable. Since the joint end portions of the prestressed concrete column and the prestressed concrete beam in such a prestressed concrete structure have little toughness, there is a drawback that they are easily collapsed by an earthquake or the like. The present invention has been made in view of the problems as described above, and an object thereof is to increase the toughness of a prestressed concrete member in a prestressed concrete structure, which is easily crushed.

[0004]

In the prestressed concrete member of the present invention for attaining the above object, a reinforcing member is embedded in a joint end portion of a prestressed concrete member main body, and the reinforcing member has spiral spirals closely contacted with each other. A solidified material is filled in the cylinder, and the prestressed concrete member main body is a prestressed concrete column or a prestressed concrete beam.

[0005]

Then, a reinforcing member is embedded in the joint between the lower part of the prestressed concrete column and the beam or at the joint end of the prestressed concrete beam, and the reinforcing member is a solidifying material in the cylinder in which the spiral streaks are in close contact. By filling
It is possible to increase the toughness of the joint between the lower part of the prestressed concrete column and the beam and the joint end of the prestressed concrete beam.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a cross-sectional view of a prestressed concrete structure M using the prestressed concrete member 1 of the present invention. The reinforcing body 4 is embedded in the joint end of the beam 3.

The prestressed concrete pillar 2 is made of precast material, and four reinforcing members 4 are provided under the precast concrete pillar 2.
Two reinforcing bodies 4 are embedded in the protrusions 2a at the joints with the beams. As shown in FIG. 3, the reinforcing body 4 having a diameter larger than that of the four reinforcing bodies 4 may be embedded in the central portion of the prestressed concrete column 2. The diameter and the number and location of burial can be arbitrarily determined according to the size of the prestressed concrete column 2.

The prestressed concrete beam 3 laid between the prestressed concrete columns 2 is also made of precast in the same manner as described above, and two reinforcing bodies 4 are vertically embedded at both joint ends thereof. Further, in the case of the large-span prestressed concrete beam 3, FIG. 6 and FIG.
As shown in FIG. 3, three or four reinforcing bodies 4 are embedded, and the diameter of the reinforcing body 4 and the number and location of the reinforcing bodies 4 can be arbitrarily determined according to the size of the beam.

In the reinforcing body 4, as shown in FIG. 8, a steel bearing plate 7 is welded to the lower end of a cylindrical body 6 in which spiral streaks 5 are closely contacted at an interval of 0 to 2 mm. Is filled with a solidifying material 8 such as high-strength concrete, mortar, cement paste, and gypsum. Further, the cylindrical body 6
Reinforcing bars 9 can also be arranged on the inner surface of the pressure bearing plate 7, and the pressure bearing plate 7 can be provided not only at the lower end of the tubular body 6 but also at both upper and lower ends (FIGS. 9 and 10).

Further, the reinforcing member 4 is not limited to the precast product as described above, but can be manufactured on site. In this case, the solidified material 8 is filled in the tubular body 6 at the site at the same time when the cast-in-place concrete pillar or the cast-in-place concrete beam is poured into the concrete.

[0011]

EFFECTS OF THE INVENTION Since a reinforcing body is embedded in the joint end portion of the prestressed concrete member main body, and the reinforcing body has a structure in which a solid material is filled in a cylindrical body in which spiral muscles are closely contacted, a prestressed concrete member having high toughness Can be provided.

Since the reinforcing member is embedded in the joint end of the prestressed concrete column, and the solidified material is filled in the cylindrical body in which the spiral streak is closely contacted, the toughness of the joint end of the prestressed concrete column is improved. Can be increased.

Since the reinforcing member is embedded in the joint end portion of the prestressed concrete beam and the reinforcing member is filled with the solidifying material in the cylindrical body in which the spiral streak is closely contacted, the toughness of the joint end portion of the prestressed concrete beam is improved. Can be increased.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a prestressed concrete structure.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is a cross-sectional view of a prestressed concrete column showing another embodiment of the method for burying a reinforcing body.

FIG. 4 is a sectional view taken along line BB in FIG.

5 is a cross-sectional view taken along the line CC of FIG.

FIG. 6 is a cross-sectional view of a prestressed concrete beam showing another embodiment of a method for burying a reinforcing body.

FIG. 7 is a cross-sectional view of a prestressed concrete beam showing another embodiment of a method for burying a reinforcing body.

FIG. 8 is a vertical sectional view of a reinforcing body.

FIG. 9 is a plan view showing another embodiment of the reinforcing body.

FIG. 10 is a front view showing another embodiment of the reinforcing body.

[Explanation of symbols]

 1 Prestressed concrete member 2 Prestressed concrete column 3 Prestressed concrete beam 4 Reinforcement body 5 Spiral reinforcement 6 Cylindrical body 8 Solidification material

Claims (3)

[Claims] 1. A prestressed concrete member comprising a prestressed concrete member main body in which a reinforcing member is embedded in a joint end portion, and the reinforcing member is filled with a solidifying material in a cylindrical body in which spiral streaks are closely contacted. 2. The prestressed concrete member according to claim 1, wherein the prestressed concrete member main body is a prestressed concrete column. 3. The prestressed concrete member according to claim 1, wherein the prestressed concrete member main body is a prestressed concrete beam.