JPH11193632A - Fixing method of tension member and fixing device thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve inequality of length between respective compression joint grips by inserting tension materials into the tension material insert holes of regulating bolts to fit compression joint grips to them, then rotating regulating bolts to give fixed tension. SOLUTION: Fixing devices 1 are provided on both sides of a concrete member 5 through bearing plates 12, and the end part of a tension member 6 such as PC steel wire into the tension member insert hole 11 of a regulating bolt 4 in the fixing device. One part of the tension member 6 is projected from the concrete member 5, and by tensing it by fixed force, fixed pre-stress is given to the concrete member 5. Next, cylindrical sleeves are pressure fitted to both end parts of the tension member 6 to fit a compression joint grip 13. Next the respective regulating bolts 4 are rotated, the bolt heads 8 are brought in contact with the underside of the climp grips 13, and fixed tension are given to the tension member 6 to be temporarily tensed. Hereby, inequality of length between the respective compression joint grips 13 can be dissolved, and looseness of the tension member 6 can be dissolved for example.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for fixing a tendon material and a fixing device therefor.

[0002]

2. Description of the Related Art In general, a cable used for a structure or the like is sometimes applied with a tension of only about 10 to 20% of a tensile strength in the mechanical properties of the cable itself. Tension may be increased by a factor of 2-3 depending on the structure. In addition, when a strong wind or an earthquake occurs when there is no overhead load, the tension may be reduced to a compressive force.

As shown in FIG. 8A, in a conventional tension member fixing device, a tension member 17 is fixed to a tapered hole 20 of an insertion hole 15 of a fixing cone 16 using a wedge 19. If the wedge 19 is fixed with a certain tension, the fixing function will not be lost within the tension. However, when the tension is suddenly increased, the function cannot be sufficiently exerted, and the tension member 17 becomes wedge-shaped. There is a fear that the user may get out of 19.

In order to prevent such a situation, a crimping grip 21 has been used for the tension member 17 as shown in FIG. This crimping grip 21 has a sufficient fixing function from the tension of the tension member 17 to the breaking load.

[0005]

However, when a crimping grip is used at the end of the tendon as described above, and a plurality of the crimping grips provided at both ends of the tendon are gathered to form a single cable, the crimping grip is used. Since it was almost impossible to equalize the lengths between them, there was a problem that the tension was not evenly applied to the tension member. Also, in the case of a single tension member provided with crimp grips at both ends, there is a possibility that a predetermined tension cannot be applied due to slack of the tension member or the like.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to provide a tension member fixing method and a fixing device capable of applying a predetermined tension to the tension member. .

[0007]

Means for solving the above problems are as follows. The fixing method of the tension member is such that the other end of the tension member having one end fixed is connected to the tension member of the adjusting bolt in the fixing cone. A crimping grip is provided at the other end of the tendon material inserted into the insertion hole and protruding from the tendon material insertion hole, the adjusting bolt is rotated to temporarily tension the tendon material, and then tensioned by a tension jack. I do. In addition, the tensioning material fixing device
Adjustment bolts through which the tendon insertion holes for inserting the ends of the tendon are inserted are screwed up and down freely into the through holes of the fixing cone, and the fixing cone is screwed up and down into the fixing nut. It is characterized by.

A tension member is inserted into the tension member insertion hole of the adjusting bolt in the fixing cone, and a crimping grip is crimped to an end of the tension member protruding from the tension member insertion hole. Then, the tension member is given a predetermined tension by rotating the adjustment bolt to push up the pressure grip so that the tension member is temporarily tensioned. Thus, when there are a plurality of tendon members, the length of each tendon member can be adjusted, so that the tension can be achieved with an equal force, and when there is only one tendon member, a predetermined tension can be accurately applied. .

In addition, in order to perform the actual tension in a state of provisional tension in which a predetermined tension is applied to the tension member, in the case of a tension member having crimping grips at both ends, even if a plurality of tension members are used, each tension member has The length between the crimping grips can be equalized.

[0010]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing an embodiment of a fixing method for a tendon material and a fixing device therefor. First, we explain the fixing device for tension material,
Then, the fixing method of the tension member will be described. 1 is a plan view of a tension member fixing device, FIG. 2 is a sectional view taken along line AA of FIG. 1, FIG. 3 is an exploded sectional view of the tension member fixing device, and FIG. 4 is a perspective view of the tension member fixing device. is there.

The tensioning material fixing device 1 is composed of a fixing nut 2, a fixing cone 3, and an adjusting bolt 4, and is inserted into a concrete structure or other steel structure, and a part of these structures. It fixes the end of a tendon such as a PC steel wire protruding from the end.

The fixing nut 2 is cylindrical or polygonal. A fixing cone 3 is screwed into a screw 2a provided on the inner surface, and the fixing cone 3 can be moved up and down by rotation of the screw. Seven fixing holes 3 are opened in the fixing cone 3, and adjustment bolts 4 are screwed into the through holes 7, and the adjustment bolts 4 can be moved up and down by screw rotation as described above. The number of the through holes 7 is not limited to seven, and an arbitrary number of through holes can be used.

The adjusting bolt 4 has a hexagonal or cylindrical bolt head 8 of substantially the same size as the shaft 9, and a screw 10 is provided on the entire length of the shaft 9. Further, a tension member insertion hole 11 for inserting a tension member in the axial direction of the adjustment bolt 4 is penetrated, and has a size that allows the tension member to be easily inserted. The adjusting bolt 4 can be easily rotated by various tools. In the present embodiment, seven adjusting bolts 4 are provided. Can be.

Next, a method for fixing a tension member using the fixing device 1 will be described. This anchoring device includes cables for cable staying, prestressed and steel beams (truss beams, single beams, assembled beams), fall prevention cables, tie cables for retaining, standby type ground anchors, membrane structure stay cables, suspension roofs Cable, such as a cable for hanging, a hanging cable for a hanging structure, a cable for a balance roof, and the like, and installed at both ends or one end of these cables.

FIG. 5 is a cross-sectional view used for the tie cable for retaining. The fixing device 1 is installed on both sides of the concrete member 5 via the supporting plate 12, and the tension member of the adjusting bolt 4 in the fixing device 1 is inserted. Tensile material 6 such as PC steel wire in hole 11
Insert the end of A part of the tension member 6 is inserted into the concrete member 5, and both ends protrude from the concrete member 5. The tension member 6 is tensioned with a predetermined force to apply a predetermined prestress to the concrete member 5. .

Then, a cylindrical sleeve is crimped to both ends of the tension member 6, and a crimping grip 13 is attached. The mounting position of this crimp grip 13 is determined in advance,
Mark it with a marker. Also crimp grip 13
6, the adjusting bolt 4 is completely screwed into the through hole 7 of the fixing cone 3 as shown in FIG. 6, that is, the bolt head 8 is in a state of being adhered to the upper surface of the fixing cone 3. ing.

Next, as shown in FIG.
Is rotated to bring the bolt head 8 into contact with the lower surface of the crimping grip 13 to apply a predetermined tension to the tension member 6 to temporarily tension the tension member 6.
As a result, it is possible to eliminate irregularities in the length between the press-fit grips 13 and also to eliminate, for example, slack in the tension member (see FIG. 5).

In this state, that is, when the tension members are temporarily tensioned and then a jack (not shown) is attached to the fixing device 1 and the seven tension members 6 are simultaneously tensioned with a predetermined tension, the respective tension members are tensioned. 6 are equally tensioned, and all are equally tensioned.

As described above, since the difference in length between the crimping grips 13 of the tension members 6 can be adjusted by the adjusting bolts 4, uniform tension can be easily applied. Although the present embodiment has been described with reference to the case where the fixing device 1 is provided at both ends of the tension member 6, this can be applied to a case where the fixing device 1 is provided at one end, and in this case, tension is applied in the same manner as described above. .

[0020]

When the tension member is inserted into the tension member insertion hole of the adjusting bolt and the crimping grip is attached, the adjusting bolt is rotated to apply a predetermined tension to the tension member and temporarily tension the tension member.
Since uneven lengths between the crimping grips can be eliminated, each tendon can be tensioned with an equal force when there are multiple tendons, and the prescribed tension can be accurately applied when only one tendon is used. Can be given.

When there are a plurality of tendon members, the length between the uneven crimping grips can be adjusted.

After the tension member is temporarily tensioned, the tension can be adjusted to adjust the difference in elongation of the tension member.

[Brief description of the drawings]

FIG. 1 is a plan view of a tension member fixing device.

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

FIG. 3 is an exploded cross-sectional view of a tensioning material fixing device.

FIG. 4 is a perspective view of a tension member fixing device.

FIG. 5 is a sectional view of a fixing method of a tendon material.

FIG. 6 is a sectional view of a fixing method of a tendon material.

FIG. 7 is a cross-sectional view of a method for fixing a tension member.

FIGS. 8 (1) and (2) are cross-sectional views of a conventional fixing method of a tension member.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fixing apparatus 2 Fixing nut 3 Fixing cone 4 Adjusting bolt 5 Concrete member 6 Tensile material 11 Tensile material insertion hole 12 Support plate 13 Crimping grip

Claims (5)

[Claims] 1. The other end of a tendon material having one end fixed thereto,
After inserting the adjusting bolt in the fixing cone into the tendon inserting hole of the adjusting bolt, providing a crimping grip at the other end of the tendon projecting from the tendon inserting hole, and rotating the adjusting bolt to temporarily tension the tendon A tensioning material fixing method characterized by tensioning with a tension jack. 2. The fixing method according to claim 1, wherein the number of the tendon is one or more. 3. An end portion of the tension member is also inserted into a tension member insertion hole of an adjustment bolt in the fixing cone, and a crimping grip is provided at a portion protruding from the tension member insertion hole. 3. The fixing method of the tendon according to 1 or 2. 4. An adjusting bolt, through which a tendon insertion hole for inserting an end portion of the tendon, is screwed into the through hole of the fixing cone so as to be vertically movable, and the fixing cone is vertically movable with respect to the fixing nut. A tensioning material fixing device characterized by being screwed into a tongue. 5. The tension member fixing device according to claim 4, wherein the tension member insertion hole of the adjustment bolt has a larger diameter than the tension member.