JPH05118139A - Tension jack orientation and positioning device and orientation and positioning method - Google Patents

Abstract

PURPOSE:To improve tension work execution ability by connecting tension material to a tension jack through a plurality of piled curved chairs having a ring-like mantle pipe whole shape viewed from the side is trapezoid and also rotating the mantle pipe to adjust bending orientation. CONSTITUTION:A ring-like mantle pipe 4 whose upper part is narrow and lower part is broad and a disk type rotary board 5, both faces of which are conical and which has a plurality of insertion holes 2a are provided. A plurality of curve chairs 2 rotatably housing the rotary board 5 are formed in the pipe 4, stacked with their upper sections facing upward to form a curved part facing upward. A straight chair 1 is mounted on the anchor head 20 provided in the recessed groove part of a beam made of prestressed concrete. The chair 2 is mounted on the chair 1 with tension member (m) inserted into the holes 2a, and the pipe 4 is also rotated to correct curving direction. A tension jack B is mounted through a jack chair 3 to give tension to the tension member (m). With this constitution, tension work can be correctly and easily executed along the center of the tension member.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used when tensioning a prestressed concrete structure such as a high-rise building or an underground structure or a ground anchor of an anchor structure when it is difficult to install a tension jack. The present invention relates to a directional positioning device for a tension jack and a directional positioning method thereof.

[0002]

2. Description of the Related Art As a method of tensioning a tension material of prestressed concrete, when both ends of a concrete structure are open, a tension jack is used to tension both sides of the structure. However, when both ends of the concrete structure are not open, a groove is formed in the middle of the structure, and a tension jack is inserted into the groove to tension the tension member. In this case, since the tension jack cannot be installed linearly, the tension jack directional positioning device 30 as shown in FIG. 9 is used. In this, a curve chair 60 is attached to the anchor head 40 via a straight chair 50, and a tension jack 70 is attached to the outside of the concave groove by the upward curve of the curve chair 60.

[0003]

However, since the above-mentioned curve chair is curved only upward, the mounting direction of the curve chair is determined by the direction in which the anchor head is mounted. Therefore, for example, when the anchor head is attached to be tilted rightward, the tension jack cannot be easily attached because the tension jack is also attached in that direction. The present invention has been made in view of the above problems, and an object of the present invention is, when a tension jack is attached, a tension jack directional positioning device capable of attaching the tension jack along a center line of a tension member. And its directional positioning method.

[0004]

SUMMARY OF THE INVENTION To achieve the above object, a tension jack directional positioning device of the present invention comprises a straight chair attached to an anchor head at the end of a tension member and a direction of the tension member by stacking a plurality of straight chairs. And a curve chair for transmitting the reaction force of the tension jack to the anchor head and a jack chair provided between the curve chair and the tension jack, and the curve chair is rotatably disposed in the outer tube and the outer tube. It is configured by a housed rotating disk, and is characterized in that a conical portion is provided on both surfaces of the rotating disk.

The direction of the tension jack is determined by using a straight chair provided on the anchor head at the end of the tension member.
A plurality of curve chairs consisting of an outer tube and a turntable having conical portions on both sides and rotatably housed in the outer tube are stacked, and the outer tube is rotated to bend the curve chair in an arbitrary direction. After bending and correcting the direction of the tension member, a tension jack is attached to the curve chair via a jack chair to position the direction.

[0006]

Thus, the curve chair is composed of the outer tube and the turntable rotatably housed in the outer tube, and the conical portions are provided on both sides of the turntable, so that the curve chair is a tension member. Since the curved chair can be bent in any direction by inserting it into the armchair and rotating the mantle tube, even if the anchor head is tilted to the right and the tendon is curved to the right, that curve can be bent. Can be straightened and the tension jack can be attached along the centerline of the tension material.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a front view of the tension jack directional positioning device of the present invention attached to a concave groove of a prestressed concrete beam, FIG. 2 is a sectional view of the tension jack directional positioning device, and FIG. 3 is a tension jack directional positioning device. FIG. 4 is a partially cutaway plan view, and FIG. 4 is an enlarged sectional view taken along line XX of FIG.

The tension jack directional positioning device A is composed of a straight chair 1, a curve chair 2 and a jack chair 3, and the anchor in the groove 10a of the prestressed concrete beam 10 via the tension jack directional positioning device A. A tension jack B is attached to the head 20. The straight chair 1 fitted to the anchor head 20 has a disc shape, and a fitting groove 1a for fitting an anchor head is formed on one surface of the straight chair 1 and a tension member m.
Is provided with an insertion hole 1b. The straight chair 1 is attached by inserting the tension member m into the insertion hole 1b and fitting the fitting groove 1a into the anchor head 20.

The curve chair 2 comprises a jacket 4 and a turntable 5 having an insertion hole 2a into which the tension member m is inserted. The tension member m is inserted into the insertion hole 2a to form a plurality of straight chairs 1. Since the outer tube 4 can be rotated by mounting them on top of each other, the direction of the tension member m can be corrected and the reaction force of the tension jack B is transmitted to the anchor head 20.

The outer tube 4 has a narrow upper portion and a wide lower portion, and is attached so as to curve upward by stacking the upper portion on the upper side. Further, the turntable 5 has a circular shape and has conical portions 5a on both sides, is rotatably inserted into the outer tube 4, and has a line contact with the adjacent turntable 5 at the conical portion 5a, so that the curve chair 2 can be moved in any direction. It is formed to be bendable. Therefore, when a plurality of curve chairs 2 are inserted into the tension member m, they are attached in the direction along the tension member m, but the bending direction can be corrected by rotating the outer tube 4 of each curve chair 2.

For example, as shown in FIG. 7, when the tension member m is displaced to the left side from the center line, the outer tube 4 of the intermediate curve chair 2 is rotated to position the wide lower portion on the left side surface. Then, the curved chair 2 is bent and the tension member m is bent toward the center line n. In this case, turntable 5
Rotates along the conical portion 5a of the adjacent turntable 5, so that it can be bent in any direction.

The jack chair 3 has a cylindrical shape, and a fitting groove 3a for fitting the curve chair 2 is formed on one surface of the jack chair 3 and an insertion hole 3b into which a tension member m is inserted. The jack chair 3 is attached by fitting the curve member 2 into the fitting groove 3a by inserting the tension member m into the insertion hole 3b.

Next, the directional positioning method of the tension jack of the present invention will be described. First, the straight chair 1 is attached to the anchor head 20 in the groove 10a of the prestressed concrete beam 10. This is attached by inserting the tension material m extended from the anchor head 20 into the insertion hole 1b.

Next, the curved chair 2 is sequentially attached to the tension members m.
When the tendon m is curved rightward or leftward, the outer tube 4 is rotated to adjust the direction of the tendon m each time the curve chair 2 is inserted into the tendon m. To do. Then, after the curve chair 2 is attached to the straight chair 1 and the direction of the tension member m is adjusted, the jack chair 3 is attached in the same manner as the straight chair 1 and the tension jack B is attached to the jack chair 3. get nervous.

FIG. 8 shows a structure in which the directional positioning device A of the tension jack of the present invention is used for an anchor structure for supporting the structure 7 by the ground anchor 6, and the ground anchor 6 is not limited to the tension member of the prestressed concrete. It can be used even when the tension jack B cannot be attached due to an obstacle when straining.

[0016]

According to the present invention, the directional positioning device of the tension jack is attached to the anchor head at the end of the tension member, and a plurality of sheets are stacked to correct the direction of the tension member and the reaction force of the tension jack is applied to the anchor. A curve chair transmitted to the head, and a jack chair provided between the curve chair and the tension jack. The curve chair includes an outer tube and a turntable rotatably housed in the outer tube. By providing conical parts on both sides of the board, it is possible to bend the curve chair in any direction, so correct the bending of the tension member and attach the tension jack along the center line of the tension member. You can

A plurality of curved chairs each having a jacket tube and a turntable having conical portions on both sides and rotatably accommodated in the jacket tube are stacked on a straight chair provided on the anchor head at the end of the tension member. At the same time, the outer tube is rotated to bend the curve chair in any direction to correct the direction of the tension material, and then the tension chair is attached to the curve chair via the jack chair to correct the bending of the tension material. Since the tension jack can be attached in any direction, the tension work can be easily performed.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a tension jack directional positioning device of the present invention attached to an anchor head.

FIG. 2 is a cross-sectional view of a directional positioning device for a tension jack.

FIG. 3 is a partially cutaway plan view of the tension jack directional positioning device.

FIG. 4 is an enlarged cross-sectional view taken along line XX of FIG.

FIG. 5 is a sectional view of the curved chair in a disassembled state.

FIG. 6 is an exploded perspective view of a curve chair.

FIG. 7 is a partially cutaway plan view of the directional positioning device of the tension jack in which the curve chair is bent to the right.

FIG. 8 is a cross-sectional view of a state in which a tension jack directional positioning device is used for the anchor structure.

FIG. 9 is a cross-sectional view of a conventional directional positioning device for a tension jack.

[Explanation of symbols]

 A Tension jack directional positioning device B Tension jack 1 Straight chair 2 Curve chair 3 Jack chair 4 Outer tube 5 Rotating plate 5a Cone

Claims (2)

[Claims] 1. A straight chair attached to an anchor head at the end of a tension member, a curve chair for correcting the direction of the tension member by stacking a plurality of sheets and transmitting a reaction force of the tension jack to the anchor head, the curve chair, and The curved chair is composed of an outer tube and a turntable rotatably accommodated in the outer tube, and a conical portion is provided on both sides of the turntable. Directional positioning device for characteristic tension jacks. 2. A plurality of curved chairs each comprising a straight chair provided on an anchor head at an end portion of a tension member, and an outer tube and a turntable having conical portions on both sides and rotatably accommodated in the outer tube. After stacking them and rotating the outer tube to bend the curve chair in an arbitrary direction to correct the direction of the tension member, a tension jack is attached to the curve chair via a jack chair to position the direction. A characteristic method for directional positioning of a tension jack.