JP3974469B2 - Curving method for twisted wire connection and twisted wire with curved end of connecting end - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for curving a twisted wire connecting portion when a plurality of twisted wires having a predetermined length such as a galvanized steel twisted wire are processed into a spiral shape and sequentially connecting the end portions, and a twisted shape in which the connecting end portions are curved. Regarding the line.
[0002]
[Prior art]
Recently, some of the applicants proposed a method as shown in FIGS. 4 and 5 (Japanese Patent Application No. 2002-136106) as a method of reinforcing an existing column made of reinforced concrete against an earthquake or the like. Although this existing column reinforcing method is not publicly known (prior art), it will be described for the sake of convenience. On the four peripheral surfaces of the existing column 51 having a square cross section, a ¼ arc having an arc shape with both ends cut off as shown in FIG. 4 and a concrete block 52 having a parallelogram-like vertical surface having a plurality of grooves 53 extending in parallel with the lower side as shown in FIG. After the outer circumference of the existing column 51 is covered over the entire length, the steel wire 55 that has been processed into a spiral shape slightly smaller than the diameter of the spiral groove from the lower end of the spirally connected groove 53 is manually applied by the operator. The concrete block 52 is wound while being elastically deformed, and the concrete block 52 is tightened and integrated toward the existing column 51 to improve the shear strength of the existing column 51 against the seismic load.
[0003]
[Problems to be solved by the invention]
Compared to the conventional method of winding steel wire while bending it on site, the method for reinforcing existing pillars proposed by the above-mentioned applicant does not require a large machine such as a hydraulic cylinder and is easy with only the human power of the operator. And it has the advantage that it can be constructed quickly.
However, the total length of the spiral steel wire 55 wound around one existing pillar 51 is several hundred meters, and in view of the efficiency of manual winding work and bending work performed in advance by a machine, one continuous full length wire is used. It is virtually impossible to make this steel wire.
For this reason, it is necessary to connect the end portions sequentially while suppressing the length of the steel wire processed into a spiral shape so that the operator can handle it. A method is used in which the overlapped portions are fastened and fixed from the outer periphery with a steel band called a clip.
[0004]
However, since the conventional steel wire end connecting method is to fasten and fix the overlapping portion with a band from the outer periphery, when a horizontal shearing force due to an earthquake is applied to the existing column 51, the spiral shape is wound. The steel wire is deformed so that the cross-sectional area is reduced by applying a tensile force in the circumferential direction of the steel wire, so the tightening by the band loosens and the two ends overlapped, and sufficient shear strength is exhibited. There is a problem that it is not.
Moreover, since the ends of the steel wires are overlapped with each other, there is a problem that the connection location becomes twice as thick, the adhesion of the concrete block 52 to the groove 53 becomes insufficient, and the appearance is also impaired.
[0005]
Therefore, an object of the present invention is to use a steel stranded wire as a steel wire, and by devising the structure of the connecting portion, it does not come off even when a tensile force is applied, and can exhibit sufficient strength, and a curved twisted strand. An object of the present invention is to provide a method of curving a twisted wire connecting portion and a twisted wire obtained by curving the connecting end portion, which can easily wind and interconnect a wire to an existing pillar or the like manually.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the method of processing a curved line of the stranded wire connecting portion according to the first aspect of the present invention is such that the ends of two linear stranded wires are opposed to each other, and the two linear stranded wires are A grip is wound around the outer periphery of the end portion, the two straight stranded wires are connected in a straight line, and the two stranded wires and the wound grip are processed into a predetermined shape curve together. The grip wound around the stranded wire is loosened, the one stranded wire is removed from the grip, and the grip is wound around the other stranded wire.
[0007]
Here, the grip means a wire processed into a spiral shape for connecting ends of stranded wires facing each other. For example, a plurality of fine wires joined in parallel to each other are spirally smaller in diameter than the diameter of the stranded wire. The two ends are connected to each other by winding them in a spiral manner over a predetermined length on the outer periphery of both ends of the stranded wire facing each other. In the curved line processing method of the stranded wire connecting portion according to claim 1, after winding the grip around the outer periphery of both ends of the two stranded wires that are opposed to each other on a straight line, the both ends and the grip are joined together in a predetermined shape. Since it is processed into a curved line, the center axis of the spiral grip to be wound is the plane created by both ends, as in the case where the grip is wound after processing both ends and grips separately into the same shape of the curve. Therefore, both ends and the grip can be easily processed into a curved line having the same predetermined shape with the grip wound around both ends.
[0008]
Also, the grip wound around one strand wire side is loosened, one strand wire is removed, and the grip is wound around the other strand wire side so that it is processed into a spiral around, for example, an existing pillar After winding one stranded wire, insert the end of the other stranded wire that has been spirally processed into the loosened grip so that it abuts the end surface of the one stranded wire, When it is wound around the outer periphery of the stranded wire again, it can be easily wound tightly on the outer periphery of the stranded wire, and friction can be generated between the grip and the stranded wire to firmly connect both ends of the stranded wire. .
Therefore, for example, the work of winding while winding the twisted wires that are curved over the entire length around the existing pillars can be easily performed manually without requiring a machine.
[0009]
In the method of curving a twisted wire connecting portion according to the second aspect of the present invention, the ends of the two straight twisted wires are opposed to each other, and the ends of the ends of the two straight twisted wires are arranged at both ends. A thin short tube is tightly fitted so as to connect the parts, a grip is wound around the outer periphery of the thin short tube and the stranded wire on both sides thereof, and two straight stranded wires are connected in a straight line, Two twisted wires, a thin short tube, and a wound grip are processed together into a predetermined curve, loosen the grip wound on one side of the twisted wire, and remove the one twisted wire from the thin short tube And while leaving the said thin short tube on the other said strand wire side, it leaves in the state which wound the grip.
[0010]
In the curved line processing method of the stranded wire connecting portion according to claim 2, after tightly fitting the thin short tube so as to connect both ends to the outer periphery of both ends of the two stranded wires opposed to each other on a straight line, Since the grip is wound around the outer periphery of the thin short pipe and the stranded wire on both sides thereof, both ends and the grip and the thin short pipe are processed into a predetermined shape curve together. Can be processed into a smooth curve having a predetermined shape without causing the grip to be bent at both ends, and without sudden bending at opposite locations on both end faces.
Also, loosen the grip wound around one stranded wire, remove one stranded wire from the thin short tube, leave the thin short tube on the other stranded wire side and leave the grip in a wound state. The end of the other stranded wire to which the short tube is fitted does not unravel and spread, and the end of the other stranded wire to be connected can be easily inserted into the thin short tube inside the loosened grip. The connection becomes easy, and the grip can be wound again around the outer periphery of the other end of the stranded wire without any gap, so that both ends can be connected more firmly.
[0011]
The twisted wire in which the connecting end portion of the invention of claim 3 is curved is a twisted wire in which two twisted wires are connected by a grip between the end portions. A substantially half length of a grip curved in a curved shape with the same curvature as the line is wound.
[0012]
The twisted wire obtained by curving the connection end portion of claim 3 is wound on one end of the curved twisted wire by approximately half the length of the grip that is curved in the same manner as the twisted wire, and the remaining substantially half-length grip is loosened. Therefore, the end of the stranded wire to be connected can be inserted into the loosened grip, and the loosened grip can be easily wound around the outer periphery of the end, and both ends can be firmly Can be connected.
Therefore, for example, the work of winding while winding the twisted wires that are curved over the entire length around the existing pillars can be easily performed manually without requiring a machine.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments. 1 (A) to 1 (C) are plan views showing each member used in one embodiment of a method for processing a curved line of a stranded wire connecting portion of the present invention. As shown in FIG. 1 (C), the two straight stranded wires 1 and 2 are arranged in a straight line with the end portions 1a and 2a facing each other, and both end portions on the outer periphery of the end portions 1a and 2a. 1B is tightly fitted so as to connect them, and the outer periphery of the thin short tube 3 and the stranded wires 1 and 2 on both sides thereof are processed into a spiral shape as shown in FIG. 1A. The two strips 4a and 4b are wound.
[0014]
The grips 4a and 4b have five (not limited to five) fine steel wires bonded in parallel to each other and have a diameter slightly smaller than the diameter of the stranded wires 1 and 2 (80% to 99%). When it is wound around the outer circumferences of both ends 1a, 2a of a stranded wire that is straightly connected by a thin short tube 3 with no gaps, each fine steel wire is connected to the stranded wires 1, 2 Both ends 1a and 2a are firmly connected to each other by friction generated between the grip and the stranded wire. Here, in the cross section of the stranded wires 1 and 2 around which the grips 4a and 4b are wound, the total cross-sectional area of the grips 4a and 4b is larger than the cross-sectional area of the stranded wires 1 and 2 in consideration of the strength of the connecting portion. ing. Further, it is desirable that the total length L of the wound grips 4a and 4b is a length (usually 100 to 200 times the diameter of the stranded wires 1 and 2) in consideration of grip connection performance and winding workability.
The portions of the grips 4a and 4b that are wound around the thin short tube 3 have a thick diameter corresponding to the thickness of the thin short tube 3, as shown in FIGS. Thus, the gap does not occur as in the case of the conventional example, even if it is wound around the outer periphery of the existing pillar having a circular cross section. In this embodiment, five fine steel wires are bonded in parallel to each other and spirally processed to form grips 4a and 4b. However, the number of fine steel wires is not limited to five, and a plurality of adjacent fine steel wires are used. The wires may be spiral processed without bonding them together.
[0015]
As shown in FIG. 2, the ends 1a and 2a of the stranded wires 1 and 2 connected in a straight line by the thin short tube 3 and the grips 4a and 4b are, for example, constant suitable for winding around the outer circumference of an existing column having a circular cross section. The arc of the radius of curvature is bent using a machine such as a bender. Since both ends 1a and 2a of the stranded wire are connected to each other by a thin short tube 3 which is closely fitted, the end face facing portions are bent by bending as compared with the case where the ends are connected only by grips 4a and 4b. It can be processed into a uniform arc shape without being bent more rapidly than other parts, and the end surface is expanded by bending, so that the stranded wire does not come apart, so a gap is created between the stranded wire and the wrapped grip. Connection strength does not decrease.
[0016]
Next, the grips 4a and 4b wound around one stranded wire 2 side are loosened by hand, and one stranded wire 2 is removed from the thin short tube 3 as shown in FIG. The thin short tube is left and the grip is wound around.
[0017]
The curve processing method of the stranded wire connection part of the above embodiment has the following advantages.
Two opposite ends 1a, 2a of the two stranded wires 1, 2 and the thin short tube 3 tightly fitted around both ends and grips 4a, 4b wound around the outer periphery thereof are shown in FIG. Thus, both ends 1a, 2a and grips 4a, 4b are separately processed into a predetermined shape curve, and then grips 4a, 4b are wound around both ends 1a, 2a. As in the case, the central axes of the spiral grips 4a and 4b to be wound are not included in the plane formed by the both end portions 1a and 2a, and cannot be wound in various directions.
[0018]
In addition, since the gap between the opposing ends 1a and 2a of the stranded wire which is a discontinuous portion is connected by the thin short tube 3, it is abrupt in the gap during bending as in the case where there is no thin short tube. It can be processed into a curve that is uniformly bent without bending. Further, even if one of the strands 2 is removed, the end 1a of the other strand 1 is tightly fitted on the end 1a, so that the end 1a does not loosen and spread. When the end 2a of one stranded wire 2 is connected, the grips 4a and 4b can be tightly wound around the outer periphery of the stranded wire 2 without any gaps, and the both ends 1a and 2a can be firmly connected.
[0019]
The embodiment of the stranded wire obtained by curving the connection end shown in FIG. 3 is used as follows.
The rear end of a standard stranded wire 1 (for example, 50 m) that has been processed in advance by a bender or the like into a spiral shape suitable for winding in a spiral shape (for example, a total length of 300 m) as shown in FIG. The connection end is as shown in FIG. When the winding of the stranded wire 1 to the existing pillar 51 is finished, the operator can use the thin end tube inside the grips 4a and 4b to which the front end 2a of the regular stranded wire 2 previously bent in the same manner is unraveled. 3 and the loose grips 4a and 4b are wound around the outer periphery of the front end 2a again without any gaps, and both end portions 1a and 2a are firmly connected. At that time, since the thin short tube 3 is fitted to the rear end 1a of the stranded wire 1 leaving an insertion allowance, the front end 2a of the stranded wire 2 can be inserted very easily, and the efficiency of the connecting work of the stranded wire is increased. In addition, it is possible to accurately reproduce the curvature of the connecting portion that has been bent in advance.
[0020]
The operator only has to repeat the work of winding the stranded wire around the existing column 51 in a relatively short and easy-to-handle standard unit and connecting the next stranded wire, so that the continuous length of the existing column is long. The labor can be greatly reduced as compared with the case where the stranded wire is wound at once.
Even if the existing pillar reinforced with a twisted wire with curved connection ends in this embodiment is subjected to an earthquake horizontal load, a large tensile stress is applied to the twisted wire, and the cross section of the twisted wire is contracted and deformed. The grips 4a and 4b are also contracted and deformed to maintain a strong connection, and the connection end portions that are overlapped and tightened with the band as in the conventional example are not detached and the shear strength is not exhibited.
[0021]
The other embodiment of the twisted wire connecting portion curve processing method and the twisted wire obtained by curving the connecting end portion of the present invention has the same configuration as the embodiment described with reference to FIGS. It is. Therefore, the configuration, operation, and effect of this embodiment are essentially the same as the fact that there is no thin short tube, but it is difficult to insert the end 2a of the stranded wire 2 into the end 1a of the other stranded wire 1. Since this is the same as that described with reference to FIGS.
[0022]
【The invention's effect】
As is apparent from the above description, the method of processing a curved line of the stranded wire connecting portion according to claim 1 of the present invention is to wind a grip around the outer periphery of both ends of two stranded wires opposed in a straight line, Because both ends and grips are processed into a curve with a predetermined shape, then the grip wound around one strand is loosened and one strand is removed, leaving the grip wound around the other strand In the state where the grip is wound around both ends, both can be easily processed into a curve of a predetermined shape, for example, after one spiral wire processed spirally is wound around the outer periphery of the existing pillar in a spiral shape, Insert the end of the other twisted wire that has been processed into a spiral shape into the loosened grip, and wrap the loosened grip around the outer periphery of this end again to connect both ends easily and firmly. , Repeat this to wind the stranded wire Terms of possible effort greatly reduced, thereby improving the shear strength of the existing column by a rigid connection of the connecting part.
[0023]
The curved line processing method of the twisted wire connecting part according to claim 2 of the present invention is such that a thin short tube is first fitted to the outer periphery of both ends of two twisted wires opposed in a straight line so as to connect them, and then A grip is wound in the same manner as in claim 1, both ends, a thin short tube, and the grip are processed into a predetermined curve together, and the grip wound around one strand is loosened, and one of the strands is turned into a thin short tube Since the thin short tube is left on the other side of the stranded wire and the grip is wound, the same effect as in claim 1 can be obtained, and the thin short tube can smoothly connect the connection portion without sudden bending. It can be processed into a simple curve, and both ends can be connected more easily.
[0024]
The twisted wire obtained by curving the connecting end of claim 3 of the present invention is a twisted wire that connects two twisted wires with a grip between the ends, and at one end of the curved twisted wire, Since almost half the length of the same curved grip is wound, the end of the twisted wire to be connected is inserted into the grip in the loosened state, and the loosened grip on the outer periphery of the end is easily re-inserted. The both ends can be firmly connected by winding, and the shear strength of the existing column can be easily improved by winding the stranded wire around the existing column, for example.
[Brief description of the drawings]
FIG. 1 is a plan view of each member used in one embodiment of a method for processing a curved line of a stranded wire connecting portion of the present invention.
FIG. 2 is a plan view showing a state in which a stranded wire connected to a thin short tube and a grip is bent.
FIG. 3 is a plan view showing a state where the tip end side of the grip shown in FIG. 2 is loosened and the other stranded wire is removed;
FIG. 4 is an elevation view showing a method of reinforcing a conventional existing column with a spiral steel wire.
FIG. 5 is a plan view showing a method of reinforcing a conventional existing column with a spiral steel wire.
[Explanation of symbols]
1, 2 Stranded wire 1a, 2a End 3 Thin short tube 4a, 4b Grip 5 Groove 51 Existing pillar 52 Concrete block 53 Groove

Claims (3)

The ends of the two straight strands are opposed to each other,
A grip is wound around the outer periphery of the end of the two straight stranded wires, and the two straight stranded wires are connected in a straight line,
Process the two twisted wires and the wound grip together into a curve with a predetermined shape,
A twisted wire connecting portion characterized by loosening a grip wound on one side of the stranded wire, removing the one stranded wire from the grip, and leaving the grip wound on the other side of the stranded wire. Curve processing method. The ends of the two straight strands are opposed to each other,
A thin short tube is tightly fitted to the outer periphery of the ends of the two straight stranded wires so as to connect both ends,
A grip is wound around the thin short tube and the stranded wire on both sides thereof, and two straight stranded wires are connected in a straight line,
The two twisted wires, the thin short tube, and the wound grip are processed together into a predetermined shape curve,
Loosen the grip wound on one side of the stranded wire, remove the one stranded wire from the thin short tube, and leave the thin short tube on the other side of the stranded wire and leave the grip wound. A method for processing a curved line of a stranded wire connecting portion. In a stranded wire that connects two stranded wires with grips between their ends,
A twisted wire obtained by curving a connection end, characterized in that a substantially half length of a grip that is curved in the shape of a curve with the same curvature as that of the twisted wire is wound around one end of a twisted wire that is processed into a curved shape.

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