JPH0432408Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention is a flat sheath type PC steel material interposed between a flat sheath type PC steel material and an anchor plate.
This relates to a terminal sheath for prestressing steel.

(Prior art) In the case of a prestressed concrete floor, in order to make the floor thickness as thin as possible, a flat sheath type is used in which a plurality of tendons 2 are housed in a flat sheath 1 having an oval cross section as shown in Fig. 7. PC steel material 3 is used.

The anchoring of the flat sheath type PC steel material 3 is as shown in FIGS.
are interposed between the tendons 2 and passed through each hole 6 of the anchor plate 4 with the intervals between the tendons 2 widened within the terminal sheath 5, and each tendon 2 drawn out from the anchor plate 4 is placed under tension. 2 to female cone 7
This was done by gripping the female cone 7 with the male cone 8 and securing the female cone 7 to the anchor plate 4.

(Problem to be solved by this invention) However, in the method of anchoring using the end sheath 5 which is flared toward the end and has an overall flat shape, each tendon 2 led out from the anchor plate 4 is also spread out toward the end. Therefore, the work of applying tension had to be carried out for each tension member 2, which had the disadvantage that it was very laborious and time consuming.

(Purpose of the invention) The purpose of the invention is to provide a terminal sheath for a flat sheath type PC steel material that can efficiently apply tension to each tension member at once even when fixing a flat sheath type PC steel material.

(Means of the present invention for solving the problems) The flat sheath type terminal sheath for PC steel according to the present invention has one end having a cross section similar to an ellipse, which is a flattened circular shape, and the other end having a circular cross section. The intermediate portion between these two end portions has a shape that gradually changes from the elliptical-like cross-sectional shape to the circular cross-sectional shape, and one end portion of the elliptical-like cross-sectional shape faces the flat sheath side, and the cross-sectional shape is circular. It is characterized in that the other end is directed toward the anchor plate.

(Effect of the invention) Such a terminal sheath has an elliptical-like end with a flat cross section facing the flat sheath type PC steel material.
When used with the circular cross-sectional end facing toward the anchor plate, the tendons arranged in a row within the flat sheath can be converted into a circular arrangement within this terminal sheath. Therefore, a circular anchor plate with holes drilled on the same circumference can be used as the anchor plate, and each tension member is led out in a circular arrangement, so that these tension members are Tension can be applied to the material all at once.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to FIGS. 1 to 3. As shown in the figure, in the flat sheath type PC steel terminal sheath 9 of this embodiment, one end 9A has a cross section similar to an ellipse, which is a flattened circular shape, and the other end 9B has a circular cross section. There is. Intermediate portion 9 between these end portions 9A and 9B
C has a shape that gradually changes from the aforementioned elliptical cross section to the aforementioned circular cross section.

4 to 6 show such a terminal sheath 9.
This figure shows an example of the fixing part of the flat-type PC steel material 3 using . This terminal sheath 9 is used with one end 9A having a similar elliptical cross section facing the flat sheath type PC steel material 3 side, and the other end 9B having a circular cross section facing the anchor plate 10 side. A flat sheath 1 of the flat sheath type PC steel material 3 is fitted into one end 9A of a terminal sheath 9, and each tendon 2 is introduced into this terminal sheath 9. The tendons 2, which were arranged in a horizontal line in the flat sheath 1, are converted into a circular arrangement in the terminal sheath 9. The anchor plate 10 has a circular hole 10A in the center thereof into which the end 9B of the terminal sheath 9 having a circular cross section is fitted, and the end 9B is fitted into the circular hole 10A. Furthermore, anchor plate 10
A cylindrical female cone 11 for fixing tension material is brought into contact with the outer end surface of the female cone 11, and a plurality of fixing holes 12 are opened through the female cone 11 arranged on the same circumference. The tension material 2 is inserted through 12,
The tendon material 2 is gripped and fixed by the male cone 8. Each tendon 2 is therefore led out in a circular arrangement. Therefore, tension can be applied to each tendon material 2 all at once.

(Effects of the invention) As explained above, the terminal sheath according to the invention can be used with one end having a cross section similar to an ellipse facing the flat sheath side and the other end having a circular cross section facing the anchor plate side. As a result, within this terminal sheath, each horizontal row of tendons led out from the flat sheath can be converted into a circular array and led out from the anchor plate. Therefore, tension can be applied to each tendon material all at once, and the work of applying tension to the tendon materials can be performed efficiently in a short time.

[Brief explanation of the drawing]

FIG. 1 is a front view of an embodiment of the terminal sheath according to the present invention, FIGS. 2 and 3 are side views and plan views of the terminal sheath shown in FIG. 1, and FIGS. 4 and 5 are the terminal sheath according to the present invention. FIG. 6 is a front view of the anchor plate used in this embodiment; FIG. 7 is a front view of the anchor plate used in this embodiment;
The figure is a cross-sectional view of flat sheath type PC steel material, No. 8
9 and 9 are a partially cutaway plan view and a partially cutaway side view of a conventional fixing section, and FIG. 10 is a front view of the fixing section shown in FIG. 8. 1...Flat sheath, 2...Tension material, 3...
Flat sheath type PC steel material, 8...Male cone, 9
...terminal sheath, 9A...one end, 9B...other end, 9C...middle part, 10...anchor plate, 11...female cone for tension fixation.

Claims (1)

[Scope of utility model registration request] One end has a cross-section similar to an ellipse, which is a flattened circular shape, and the other end has a circular cross-section, and the intermediate portion between these two ends gradually changes from the elliptical-like cross-section to the circular cross-section. What is claimed is: 1. A flat sheath type terminal sheath for PC steel material, characterized in that the end sheath has a variable shape, and has one end portion of the elliptical-like cross section facing the flat sheath side, and the other end portion of the circular cross section facing the anchor plate side.