JP2616866B2 - Fixing mechanism and fixing method of steel bar in tension structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fixing mechanism and a fixing method for a steel rod used as an exposed tensile member in a tension structure such as a civil engineering or building structure.

[0002]

2. Description of the Related Art In conventional civil engineering and building structures, wires are generally used as exposed tensile members. However, since a plurality of peaks and valleys having a constant depth are spirally formed on the surface by twisting steel wires, the wire is not easy to finish the coating and the design is not good.

[0003] From the viewpoint of ease of painting and design,
It has been proposed to use a steel rod as an exposed tensile material instead of a wire.
The mechanism for fixing the end of the steel rod to the structure must have a function that allows the steel rod to rotate freely so that bending stress does not act.In addition, the initial tension is introduced to the steel rod as necessary. It must have a function that can do it.

However, the conventional wire fixing mechanism disclosed on page 95 of Nikkei Architecture, March 4, 1991, issued by Nikkei BP, has a support plate on the structure side in a split groove of a fork end on the wire side. The fork end is pin-joined to the support plate by a fitting and crossing pin, and the rotation direction of the fork end with respect to the structure is limited to one direction around the pin, so that the bending stress is completely applied to the steel rod. In the case of a structure that works from a direction, it cannot be diverted as a fixing mechanism for a steel bar.

[0005] Further, since this wire fixing mechanism has no function of introducing the initial tension to the steel rod at all, when it is necessary to introduce the initial tension as needed, the initial tension introducing means is separately provided to the steel rod. In this case, an unnecessary protrusion is generated in the middle of the steel bar to take up extra space, and the ease of painting and the effect of improving the design are partially reduced.

[0006]

Accordingly, an object of the present invention is to provide a function of allowing the rotation of a steel rod, so that the steel rod can be safely used as an exposed tensile member of a tension structure,
In addition, since it has a function of introducing initial tension , it is possible to accurately increase the strength of the structure by the prestressing action, and furthermore, since both functions are embodied integrally, extra space is required. An object of the present invention is to provide a fixing mechanism and a fixing method for a steel bar which are not taken, and are excellent in design.

[0007]

Means for Solving the Problems Hereinafter, a description will be given using reference numerals in the accompanying drawings. In the fixing mechanism of the steel rod in the tension structure of the present invention, the large diameter hole 2 opened on the rear side of the socket 1 is provided. A spherical or arcuate seat 3 is provided at the bottom, and a small-diameter hole 4 is provided at the center of the seat 3 on the front side of the socket 1. A steel rod inserted into the small-diameter hole 4 and the large-diameter hole 2. 5 is provided with a screw rod 6 at the end thereof, a spherical or arcuate shoulder 8 is provided on the front side of a nut 7 screwed to the screw rod 6, and a bolt 10 on the side of the fixing partner 9 is screwed. Screw hole 1
1 is provided at the end of the large-diameter hole 2, the shoulder 8 of the nut 7 is brought into contact with the seat 3 of the socket 1, and the nut 7 is moved with respect to the steel bar 5 when applied
The initial tension introduction force point 12 is not close to the fixing partner 9
Then, the steel bar 5 is provided.

[0008]

In the fixing mechanism of the steel rod, the steel rod 5 is inserted from the small diameter hole 4 of the socket 1 to the large diameter hole 2 as shown in FIG. 7 is screwed.
By moving the socket 1 along the steel bar 5,
The nut 7 is housed in the large-diameter hole 2 of the socket 1. The socket 1 is connected to the bolt 10 by screwing the bolt 10 on the side of the fixing partner 9 into the screw hole 11 at the end of the large diameter hole 2.

The socket 1 is tightened along the bolt 10 so as to approach the fixing partner 9, and the seat 3 of the socket 1 is brought into contact with the shoulder 8 of the nut 7, as shown in FIG. The rod 5 is set in tension between the two fixing partners 9, 9. When the fixing partner 9 is displaced by wind pressure or seismic motion, the steel rod 5 rotates within a certain range while sliding the shoulder 8 of the nut 7 against the seat 3 of the socket 1,
No bending stress is applied to the steel bar 5.

When the initial tension is introduced into the steel rod 5, the external rod 9 is connected to the fixing partner 9 on one end side of the steel rod 5 by a suitable external force means 13 utilizing a hydraulic jack or the like as shown in FIG. The interval between the other end side and the fixing partner 9 is reduced by a predetermined amount. By this shortening operation, each fixing partner 9 is fixed.
Of the steel bar 5 and each nut 7 apparently move in the large-diameter hole 2 of the socket 1 toward the bolt 10 of the fixing partner 9. I do.

While maintaining this shortened state, one or both sockets 1 are tightened along bolts 10 so as to approach the fixing partner 9, and the seat 3 of each socket 1 is fitted to the shoulder 8 of each nut 7. After the contact, the applied force by the external applying means 13 is removed, and each fixing partner 9 attempts to return to the original position within the elastic range of the frame portion 14, and the steel rod 5 is attached to the steel rod 5 by the elastic restoring force. An initial tension is introduced.

In another method of introducing the initial tension, as shown in FIG. 4, a fixing partner 9 at one end of the steel bar 5 and an initial tension provided on the steel bar 5 close to the fixing partner 9 are provided. The distance between the introduction force point 12 and the introduction force point 12 is reduced by a predetermined amount by the external force means 13. This shortening operation, the steel rod 5 is the first
The main part from the initial tension introduction force point 12 to the other end is elastically deformed in the elongating direction, and the one end of the steel rod 5 and the nut 7 pass through the inside of the large-diameter hole 2 of the socket 1 and the fixing partner 9. Move toward bolt 10. Force point for initial tension introduction 12
Means that the steel rod 5 is elastically deformed in its length direction by the applied force
At this time, it moves integrally with the steel bar 5.

While maintaining the shortened state, the socket 1 at one end is tightened along the bolt 10 so as to approach the fixing partner 9, and the seat 3 of the socket 1 is fitted to the shoulder 8 of the nut 7. After the abutment, when the force applied by the external force means 13 is removed, the main portion of the steel rod 5 attempts to return to its original length within the elastic range, and the elastic restoring force causes the steel rod 5 to initially move. Tension is introduced.

Even when the initial tension is thus introduced, when the fixing partner 9 is displaced by wind pressure or seismic motion, the steel rod 5 slides the shoulder 8 of the nut 7 against the seat 3 of the socket 1. The steel rod 5 rotates within a certain range, and no bending stress is applied to the steel rod 5.

[0015]

In the embodiment shown in FIG. 2, the nut 7 is formed in a bowl shape as a whole, and the sectional diameter of the largest portion of the bowl shape is set to be equal to or slightly shorter than the large diameter hole 2 of the socket 1. Is rotatable in the large-diameter hole 2. The small diameter hole 4 of the socket 1 is formed with a tapered hole having a large diameter at the front end side. The steel rod 5 has its center on the center of curvature of the seat 3 and the outer peripheral surface of the steel rod 5 contacts the inner wall surface of the small diameter hole 4. It is rotatable within the range of contact.

The left and right reverse screws are cut off at the front half and the rear half of the bolt 10, and the rear half is screwed into the screw hole 15 of the fixing partner 9. The bolt 10 can be welded to the fixing partner 9, and the fixing method is not particularly limited.
It can also be configured integrally with the fixing partner 9. If necessary, the socket 1 is provided with a flat surface for fitting a rotary operation jig, an insertion hole, and the like. Further, between the rear surface of the nut 7 and the front surface of the bolt 10, an extra space for allowing the movement of the steel bar 5 and the nut 7 when the initial tension is introduced is left.

In the embodiment shown in FIG. 5, the nut 7 is formed in a bowl shape as a whole, and the cross-sectional diameter of the largest portion of the bowl shape is set to be equal to or slightly shorter than the large diameter hole 2 of the socket 1.
The small diameter hole 4 of the socket 1 is formed to have the same diameter from the front end side to the rear end side, but the diameter of the small diameter hole 4 is set to be sufficiently larger than the diameter of the steel rod 5, and the steel rod 5 The center rod 3 is rotatable within a range in which the outer peripheral surface of the rope 5 abuts on the front end side edge surface of the small diameter hole 4.

In the embodiment shown in FIG. 6, the nut 7 is formed in a spherical shape as a whole, and has a sectional diameter of the large-diameter hole 2 of the socket 1.
It is set equal to or slightly shorter. The small-diameter hole 4 of the socket 1 is formed in a tapered hole having a wide diameter at the front end side.
The steel rod 5 is rotatable around the center of curvature of the seat 3 within a range in which the outer peripheral surface of the steel rod 5 abuts the inner wall surface of the small diameter hole 4.

In the embodiment shown in FIG. 7, the bolt 10 is fixed to the fixing member 9 by a bolt member 17 passing through the central hole 16. In the embodiment shown in FIG. 8, the nut 7 is constituted by a thick plate having an arcuate shoulder 8 formed on the front side, and the front end portion of the large-diameter hole 2 of the socket 1 is correspondingly a groove having a rectangular cross section. It is formed in a hole shape, and an arc-shaped seat portion 3 is formed in the inner bottom portion.

In the embodiment shown in FIG. 9, only the front end of the nut 7 is formed in a spherical or arcuate shape, and the side surface is formed in a plane parallel to the central axis. A fixed distance is set between the side surface of the nut 7 and the inner side surface of the large-diameter hole 2.

[0021]

As described above, according to the present invention, the socket 1
A spherical or arcuate seat 3 is provided at the inner bottom of the large-diameter hole 2, a small-diameter hole 4 is provided at the center of the seat 3, and a steel rod 5 inserted into the small-diameter hole 4 and the large-diameter hole 2. And a nut 7 screwed to the screw bar 6 is provided with a spherical or arcuate shoulder 8 on the front side, and a screw hole 11 into which a bolt 10 on the fixing partner 9 side is screwed. Is provided at the end of the large-diameter hole 2, the shoulder 8 of the nut 7 is brought into contact with the seat 3 of the socket 1, and the steel rod 5
The initial tension introduction force point 12 that does not move with respect to
The steel bar 5 is provided in close proximity to the opponent 9.
Is allowed to rotate within a certain range around the seat portion 3 of the socket 1, so that the steel bar 5 can be safely used as an exposed tensile material of the tension structure in a state where bending stress is not applied.

A fixing partner 9 at one end of the steel bar 5 is also provided.
Or the initial tension between the fixing partner 9 at one end of the steel bar 5 and the steel bar 5.
The socket 1 is moved closer to the fixing counterpart 9 along the bolt 10 with the distance between the introduction applying point 12 and the external applying means 13 shortened by a predetermined amount, and the spherical or arc-shaped surface of the socket 1 is formed. The initial tension is introduced into the steel rod 5 as necessary by releasing the force applied by the external force applying means 13 at the stage when the seat 3 comes into contact with the spherical or arcuate shoulder 8 of the nut 7. Therefore, it is possible to accurately increase the strength of the structure by the prestressing action.

Furthermore, since the function of permitting rotation of the steel bar and the function of introducing initial tension to the steel bar are integrally realized, the overall configuration can be made compact and an extra space can be taken up for use. It is also excellent in design.

When the seat 3 of the socket 1 and the projection 8 of the nut 7 are formed in a spherical shape, the steel bar 5 can rotate in all directions, and a fixing mechanism having a wide range of application can be obtained.

[Brief description of the drawings]

FIG. 1 shows a fixing mechanism according to one embodiment of the present invention, in which two steel bars are used.
FIG. 6 is a front view when fixing is performed on one fixing partner.

FIG. 2 is a longitudinal sectional view of the fixing mechanism shown in FIG.

FIG. 3 is an explanatory diagram showing an example of an initial tension introducing method in the fixing method of the present invention.

FIG. 4 is an explanatory diagram showing another initial tension introducing method in the fixing method of the present invention.

FIG. 5 is a longitudinal sectional view of a fixing mechanism according to another embodiment of the present invention.

FIG. 6 is a longitudinal sectional view of a fixing mechanism according to still another embodiment of the present invention.

FIG. 7 is a longitudinal sectional view of a fixing mechanism according to another embodiment of the present invention.

FIG. 8 is a longitudinal sectional view of a fixing mechanism according to still another embodiment of the present invention.

FIG. 9 is a longitudinal sectional view of a fixing mechanism according to another embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Socket 2 Large hole of socket 3 Socket seat 4 Small hole of socket 5 Steel rod for exposed tensile material 6 Screw rod of steel rod 7 Nut 8 Nut shoulder 9 Fixing partner 10 Bolt 11 Socket screw hole 12 Initial tension introduction force point 13 External force means 14 Frame part 15 Screw hole of fixing partner 16 Central hole of bolt 17 Bolt member

Claims (2)

(57) [Claims] A large-diameter hole (2) opened on the rear side of a socket (1).
A spherical or arcuate seat 3 is provided on the inner bottom of the socket 1. A small-diameter hole 4 is provided at the center of the seat 3 and opened to the front side of the socket 1. The small-diameter hole 4 is inserted through the small-diameter hole 4 and the large-diameter hole 2. A screw rod 6 is provided at an end of a steel rod 5, and a nut 7 screwed into the screw rod 6.
Is provided with a spherical or arcuate shoulder 8 on the front side, a screw hole 11 into which the bolt 10 on the fixing partner 9 side is screwed is provided at the end of the large-diameter hole 2, and the shoulder 8 of the nut 7 is provided. Initially abuts against the seat 3 of the socket 1 and does not move with respect to the steel bar 5 when applied.
A tension rod 12 is brought close to the fixing counterpart 9 so that a steel rod is
5, a fixing mechanism for a steel rod in a tension structure. 2. A steel rod 5 is inserted into the small-diameter hole 4 and the large-diameter hole 2 of the socket 1, and a nut 7 screwed into a screw rod 6 at the end of the steel rod 5 is accommodated in the large-diameter hole 2. The bolt 10 on the side of the fixing partner 9 is screwed into the screw hole 11 at the end of the large diameter hole 2, and the fixing partner 9 on one end side of the steel rod 5 and the fixing partner 9 on the other end side are connected. Or the fixing partner 9 at one end of the steel bar 5
And the interval between the initial tension introduction force point 12 of the steel rod 5 and
In a state where the socket 1 is shortened by a predetermined amount by the external force means 13, the socket 1 is moved closer to the fixing partner 9 along the bolt 10, and the spherical or arcuate seat 3 of the socket 1 is changed to the spherical or arcuate shape of the nut 7. At the stage where it comes into contact with the planar shoulder 8,
A method for fixing a steel rod in a tension structure, in which the force applied by the external force means 13 is released to introduce an initial tension .