JP2562041B2 - End fixing method for PC steel wire in anchor and fixing tool - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to an anchor in which an anchor portion embedded in the ground is mainly composed of a plurality of PC steel wires,
The present invention relates to a method for fixing an end portion of a PC steel wire and a fixing tool for the PC steel wire.

[Conventional technology]

Conventionally, in the anchor in which the anchoring portion of the anchor is made of PC steel wire, a means as shown in FIG. 6 has been provided as a means for fixing the PC steel wire to the tension member of the head. In this figure, the reference numeral 1 as a whole is an anchor body. The anchor body 1 includes an anchor fixing portion 2 integrated with the ground G and a head 3 for introducing a tensile force to the anchor fixing portion 2 as main components. The anchor fixing portion 2 is composed of a plurality of PC steel wires 4, 4, .... In this case, the head portion 3 is configured to have a PC steel rod 5 on which a screw is formed, and the PC steel rod 5 is a structure (not shown) such as a concrete slab formed on the surface of the ground G or the surface of the ground G. The tension nut 7 that penetrates the anchor plate (bearing plate) 6 that abuts against the anchor plate 6 and that abuts on the anchor plate 6 when it is screwed to a portion that projects outward from the anchor plate 6. Is screwed on. The end portions of the plurality of PC steel wires 4 located on the head 3 side are the fixing tools 10
Is connected to the end of the PC steel rod 5. Fixing tool 10
In this case, as shown in FIG. 7, at the end of the PC steel rod 5, there is formed a taper portion 11 formed in a tapered shape whose diameter increases toward the tip, and the inner circumference of the taper portion 11 is fitted onto the taper portion 11. The surface is composed of the tapered portion 11 and a sleeve 12 having the same taper. The PC steel wire 4 is arranged such that its end portion is along the taper portion 11, and then the sleeve 12 is fitted into the taper portion 11 so that the end portions of the PC steel wire 4 are pinched. It is fixed by this.

Briefly explaining the anchor fixing portion 2 of the anchor body 1, reference numeral 60 is a packer that expands by injecting water, reference numeral 61 is a small diameter pipe for injecting cement milk, and reference numeral 62 is an interval between the PC steel wires 4. A spacer to hold the
Code 63 is a corrugated sheath that wraps the PC steel wire 4, code 64
Is a rod-shaped spacer for separating the corrugated sheath 63 and the drilled hole H, reference numeral 65 is a protective sheath for the PC steel wire 4, and reference numeral 66 is a converging ring. Besides, although not shown,
A small-diameter pipe for injecting water into the packer 60 and a small-diameter pipe for bleeding air when the inside of the anchor fixing portion 2 is filled with cement milk or the like are provided.

The installation method and operation of the anchor body 1 will be described below. In order to install the anchor body 1, first, a hole H is formed in the ground G at a position where the anchor body 1 is to be embedded, and the anchor body 1 is inserted into the hole H. After that, the packer 60 is filled with water and expanded, and the packer 60 is pressed against the inner surface of the drilled hole H. That is, the hole H is closed by the packer 60. Then, the hole H is filled with a hardening material such as cement milk. At this time, since the drilled hole H is blocked by the packer 60, the hardened material is efficiently filled between the tip of the drilled hole H and the packer 60. Here, the anchor body 1 is an anchor fixing portion 2 in which a portion ahead of the packer 60 is actually fixed to the ground G,
The packer 60 to the head 3 becomes the free length part 2a for transmitting the tension force. Then, when the filled hardening material is completely hardened, the tension nut 7 constituting the head 3 is formed.
Is brought into contact with the anchor plate 6 and tightened to introduce a tension force to the anchor body 1. With this, PC steel rod 5
The tensile force generated on the tape is transmitted to the taper portion 11 at the tip.
As described above, the taper portion 11 constitutes the fixing tool 10 for connecting the PC steel wire 4, and the taper portion 11
The pulling force is transmitted to the end portion of the PC steel wire 4 held between the sleeve 12 and the sleeve 12 by the wedge action. PC steel wire 4
The tensile force transmitted to the end portion is transmitted to the tip portion of the PC steel wire, that is, the anchor fixing portion 2 via the free length portion 2a, and therefore the tension force is not transmitted to the ground G via the hardening material. is there.

[Problems to be Solved by the Invention]

By the way, according to the connecting tool 10 in the anchor body 1, the tapered portion 11 and the sleeve 12 act as wedges to prevent PC
Although the end portion of the steel wire 4 can be reliably fixed and the tensile force introduced by the head portion 3 can be surely transmitted to the anchor fixing portion 2, the following inconvenience occurred.

That is, as described above, the fixing tool 10 is composed of the taper portion 11 having the enlarged diameter and the sleeve 12 fitted onto the taper portion 11. Therefore, the outer diameter of the sleeve 12 is inevitably smaller than that of the anchor fixing portion 2. Also has a large diameter. The hole H is drilled in advance for installing the anchor. Therefore, as shown in FIG. 6 or 8, the hole H is formed with a large diameter in the front portion where the fixing tool 10 is located. However, the inner part has a smaller diameter, which means that it is dug in two steps. However, in the case of constructing the hole H, usually, although not shown, a means of digging the inside of the steel pipe called a casing pipe while penetrating the steel pipe for the purpose of preventing the collapse of the ground G is adopted. . Here, for example, first, a method was performed in which the narrow part at the back was penetrated by drilling a small-diameter casing pipe and then the wide part in the foreground was penetrated by a large-diameter casing pipe. Suppose. These casing pipes, which have been excavated inside, are to be pulled out while inserting the anchor body 1 therein and filling the anchor fixing portion 2 with cement milk.
At this time, the small diameter casing pipe inserted in the back is
A situation may occur in which the front end of the large-diameter sleeve 12 is hit and cannot be pulled out. Therefore, the fixing unit 2 is not integrated with the ground G and cannot be used as an anchor body.

One of the means for solving such a problem is the ninth
As shown in the figure, it is conceivable that the hole drilling H is performed with a large diameter so that the casing pipe can be pulled out even if there is the fixing tool 10 portion over the entire length, but it is drilling work, especially drilling of rock mass. If the hole depth (length) is as long as several tens of meters, even a slight difference in the diameter of the hole to be formed causes a large difference in hole efficiency and construction period, and also in terms of cost. It is a well-known fact that it will be extremely disadvantageous, and it cannot be called an effective means.

The present invention has been made in view of the above circumstances, the anchor body is an anchor mainly composed of a plurality of PC steel wire, the PC steel wire can be reliably fixed to the tension member of the head, the diameter at the head A PC steel wire end fixing method and a PC steel wire fixing tool that can reduce the diameter of the head and thus realize a hole with a constant small diameter over the entire length of the anchor by reducing the diameter of the head hole. The purpose is to do.

[Means for solving the problem]

A first invention of the present invention is a method of fixing an anchor, in which an anchor body embedded in the ground is mainly composed of a plurality of PC steel wires, to a tension member of an anchor head of the PC steel wire. , The plurality of PC steel wires are terminated at different positions in the arrangement direction, and the PC steel wires terminated at the different positions are hooked at their respective end portions. It has a feature.

A second invention of the present invention is a fixing tool for fixing an end portion of the PC steel wire in an anchor in which an anchor body embedded in the ground is mainly composed of a plurality of PC steel wires. A connecting member provided at the tip of a member to which a tensioning force is directly applied by a tensioning member, and a plurality of connecting type fixing members that are sequentially screwed to the connecting member in the axial direction. The fixing member is composed of a connecting screw portion projecting to one end side, and a steel wire holder portion formed to have a diameter larger than that of the connecting screw portion through a step portion at a base end portion of the connecting screw portion. Moreover, the steel wire holder is
With a screw hole that opens at the bottom end face, a plurality of through holes or slits having substantially the same diameter as the PC steel wire are formed at equal intervals in the circumferential direction from the step portion to the bottom end face, and further, The outer diameters of the steel wire holder portions of the plurality of connecting type fixing members sequentially connected to the connecting member are respectively the outer diameters of the steel wire holder portions of the preceding connecting type fixing members to which they are connected. , Its outer diameter is reduced by at least the diameter of two PC steel wires,
It is characterized in that it is screwed to the inside of the PC steel wire arranged in the steel wire holder part of the connection type fixing member before which it is connected.

[Action]

According to the method for fixing the end portion of the PC steel wire according to the first aspect of the present invention, the fixing points are not concentrated in one cross section but are dispersed in a plurality of cross sections in the length direction of the anchor, so that the outer diameter of each fixing section can be reduced. It will be possible.

According to the PC steel wire fixing device of the second invention, a plurality of PCs are provided.
The steel wire can be dispersed and fixed to the step portions of the plurality of connection-type fixing members connected in the axial direction.
The method of fixing the PC steel wire, which is the invention of the above, can be realized extremely simply and effectively.

〔Example〕

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows an anchor 21 according to the present invention, which has the structure shown in FIG. 6 of the present invention (first and second inventions) and has a design allowable tensile force of 100 t (PC steel wire). 28
This is an example applied to the anchor of (book). Therefore, the anchor fixing portion 2 and the head portion 3 of the anchor 21 have the same configuration as the anchor 1, and the same components are given the same reference numerals and the description thereof will be omitted.

In FIG. 1, reference numeral 22 is a fixing tool according to the first invention of the present invention, in which case the fixing tool 22 is a connecting member 23 provided at an end portion of the PC steel rod 5 and a connecting member thereof. 23 and a plurality of (three in the illustrated example) connection-type fixing members 30 that are sequentially connected in the axial direction.

The connecting member 23 is formed in a cylindrical sleeve shape as shown in FIGS. 2 (a) and 3 (a), and has a screw 24 formed on the inner peripheral surface thereof, and one end surface thereof. 23a
The PC steel rod 5 is screwed from the side to a depth of about half.
On the other end surface 23b that is not screwed to the PC steel rod 5, a recess 25 having a depth of several mm (5 mm in the embodiment) is formed with the outer peripheral edge left slightly like a brim.

The first connecting type fixing member (hereinafter abbreviated as “first fixing member”) 30A includes a connecting screw portion 31 protruding toward one end side as shown in FIGS. 2 (b) and 3 (b). , A steel wire holder portion 33 having a diameter larger than that of the connecting screw portion 31 via a step 32 at the base end portion of the connecting screw portion 31.
Here, the connecting screw portion 31 is the screw 24 of the connecting member 23.
It is configured to be screwed on. Steel wire holder part 33
Is formed to have the same outer diameter as the connecting member 23, and has a screw hole 34 opening to the bottom end face 33a at the center thereof, and the screw hole 34 is the outer diameter of the steel wire holder portion 33. It has a small diameter. Further, a recess 35 having a diameter larger than that of the screw hole 34 but smaller than the outer diameter of the bottom end surface 33a and having a depth of several mm is formed concentrically with the screw hole 34 in the bottom end face 33a. Further, this steel wire holder portion 33 has a diameter of one PC steel wire 4 (φ7 in the embodiment) on its outer peripheral surface 33b.
mm), and a plurality of slits 36 (13 in the embodiment) are formed at equal intervals in the circumferential direction and extend from the step portion 32 to the bottom end surface 33a.

The second connection type fixing member (hereinafter, abbreviated as “second fixing member”) 30B has the same structure as the first fixing member 30A,
Further, it is formed to be smaller than the first fixing member 30A as a whole. That is, as shown in FIGS. 2 (c) and 3 (c), the second fixing member 30B has a connecting screw portion.
41, and a steel wire holder portion 43 formed at the base end portion of the connecting screw portion 41 with a diameter larger than that of the connecting screw portion 41 via a step portion 42.
Composed of and. Here, the outer diameter of the steel wire holder portion 43 is the same as that of the concave portion 35 formed in the first fixing member 30A, and the connecting screw portion 41 is
The diameter and pitch of the first fixing member 30A are set so as to be screwed into the screw holes 34 of the first fixing member 30A. The steel wire holder portion 43 has a screw hole 44 that opens to the bottom end surface 43a at the center thereof, and the screw hole 44 has a diameter smaller than the outer diameter of the steel wire holder portion 43. There is. Further, the bottom end surface 43a has a diameter larger than that of the screw hole 44, but
Recess 45 with a diameter smaller than the outer diameter of 3a and a depth of several mm
Are formed concentrically with the screw holes 44. Further, the steel wire holder portion 43 has a slit 4 on the outer peripheral surface 43b thereof, which has substantially the same diameter as the PC steel wire 4 and extends from the step portion 42 to the bottom end surface 43a.
A plurality of (6 in the embodiment) 6 are formed at equal intervals in the circumferential direction. Here, the second fixing member 30B
The outer diameter of the steel wire holder part 43 in FIG.
The outer diameter of the steel wire holder portion 33 in 30A is reduced by at least the diameter corresponding to two PC steel wires 4. By the way, the diameter of the recess 35 of the first fixing member 30A is the same as the outer diameter of the steel wire holder 43. That is, when the second fixing member 30B is screwed onto the first fixing member 30A, the outer diameter is set so as not to close the slit 36 formed in the first fixing member 30A.

The third connecting type fixing member (hereinafter abbreviated as “third fixing member”) 30C has a structure similar to that of the second fixing member 30B and is smaller than the second fixing member 30B as a whole. It can be considered to have been formed. That is, FIG. 2 (d)
And as shown in FIG. 3 (d), a connecting screw portion 51,
The connecting screw portion 51 via the step portion 52 with the connecting screw portion 51.
And a steel wire holder portion 53 formed to have a larger diameter than that of the steel wire holder portion 53 of the second fixing member 30B.
The diameter and pitch of the steel wire 4 are set so as to be reduced by an amount corresponding to the diameter of two steel wires 4, and the connecting screw portion 51 is screwed into the screw hole 44 of the second fixing member 30B. In addition, the steel wire holder 53 is
53b has the same diameter as the PC steel wire 4 and extends from the step portion 52 to the bottom end surface 53a.
A plurality of slits 56 (5 in the embodiment) are formed at equal intervals in the circumferential direction. However, in this embodiment, since the fixing member is not further connected to the subsequent stage of the third fixing member 30C, the bottom end surface 53a of the steel wire holder portion 53 which constitutes the third fixing member 30C.
No screw holes or recesses are formed in the.

Then, as described in the introduction, the fixing device 22 according to the present embodiment.
Is a connection type fixing member for the three connecting members 23.
It is constructed by sequentially connecting 30A, 30B, 30C in the axial direction.

Next, an embodiment of the fixing method for the PC steel wire, which is the first invention of the present invention, will be described together with the description of the operation of the fixing tool 22.

To fix one end of the PC steel wire 4 forming the anchor fixing portion 2 to the fixing tool 22, one of 28 PC steel wires 4, 4, ...
The 13 corresponding to the first fixing member 30A are terminated at the longest position, that is, the position closest to the head 3, and 10 of the remaining 15 are placed before the 13 or the 13 Terminate shorter than that, and the remaining 5 are terminated further before, that is, shorter than the previous 10. Here, the intervals between the respective end positions of the 13, 10, and 5 PC steel wires 4 terminated in these three stages are the first fixing member 30A and the second fixing member 30B which constitute the fixing tool 22. Thickness of each steel wire holder part 33/43 at (in the axial direction)
And In addition, as shown in FIG. 5, the end portion 4a of each PC steel wire 4 is, as shown in FIG. 5, subjected to heading by cold working (heading treatment), and a convex portion 8 having an oval shape is formed. There is.

Now, in order to actually fix the PC steel wire 4, the fixing tool 22 is first separated into the connecting member 23 and the connection-type fixing member 30, and the three connection-type fixing members 30A, 30B, 30
Separate C as well. And first, the PC
Five of the steel wires 4 terminated at the shortest position are fitted into the five slits 56 of the steel wire holder portion 53 of the third fixing member 30C, respectively. At this time, the protrusions 8 of the five PC steel wires 4 are attached so as to be hooked on the step 52. Then, on the third fixing member 30C on which these five PC steel wires 4 are set,
The second fixing member 30B is connected. Connection is the second fixing member 30B
The screw hole 44 is screwed into the screw portion 51 of the third fixing member 30C and firmly tightened. At this time, although not shown, for example, a ring-shaped collar is fitted around the steel wire holder 53 so that the five PC steel wires 4 already set do not come off from the slits 56. Good. Second
By connecting the fixing member 30B, the protrusions 8 of the five PC steel wires 4 are connected.
Enters into the recess 45 formed in the bottom end surface 43a of the second fixing member 30B and is firmly fixed to the step portion 52 of the third fixing member 30C. Therefore, the PC steel wire 4 does not separate from the slit 56. Next, the third fixing member
The ten fixing slits 46 formed in the steel wire holder portion 43 of the second fixing member 30B connected to 30C are terminated at a position protruding one step from the five PC steel wires 4 previously set. Was 10
Insert the PC steel wire 4 of the book. The procedure is the same as in the case of the previous five. If the PC steel wire 4 is set on the second fixing member 30B, the second fixing member 30B is set in the same manner.
First fixing member 30A is connected to the steel wire holder portion 33
The 13 PC steel wires 4 terminated at the longest position are set in the 13 slits 36 formed in the. This procedure is similar to the previous operation. Then, 13 PC steel wires 4 are attached to the first fixing member 30A.
Is set, the screw portion 31 of the first fixing member 30A
13 from the other end surface 23b side of the connecting member 23,
The convex portion 8 of the steel wire 4 enters the concave portion 25 and is firmly tightened so as to be firmly fixed.

By the above, fixing of all 28 PC steel wires 4 is completed, and thereafter, one end of the PC steel rod 5 forming the head 3 may be screwed to the screw 24 of the connecting member 23.

The anchor 21 fixed as described above can be used for the PC steel wire 4 by installing it similarly to the conventional anchor 1 shown in FIG. 6 and then tightening the tensioning nut 7 constituting the head 3. . A tension force is generated in the PC steel rod 5 by tightening the tension nut 7, and the tensile force is transmitted to the first fixing member 30A via the connecting member 23 screwed to the tip of the PC steel rod. In the steel wire holder portion 33 of the first fixing member 30A, 13 PC steel wires 4 are provided,
Since it is set with the step part 32 hooked,
The tensile force transmitted to the first fixing member 30A is
It is introduced into the PC steel wire 4 of the book. Moreover, the tensile force of the first fixing member 30A is also transmitted to the second fixing member 30B connected thereto. The ten PC steel wires 4 are set in the steel wire holder portion 43 of the second fixing member 30B with their convex portions 8 being hooked on the step portions 42, so that the second fixing member 30B The tensile force transmitted to the PC steel wires 4 is introduced into the 10 PC steel wires 4. Further, the tensile force of the second fixing member 30B is also transmitted to the third fixing member 30C connected to the second fixing member 30B, so that the five PC steel wires 4 set on the third fixing member 30C according to the same principle as described above. The pulling force is introduced into.

Here, it is needless to say that in the plurality of PC steel wires 4 whose fixing positions are set to three different positions, a uniform pulling force is introduced to all the PC steel wires 4, but
Since the fixing portions are dispersed in three places by shifting the fixing end portions of the PC steel wires 4 in three steps in this manner,
Avoiding the concentration of all fixing edges on the same cross section,
Therefore, the diameter of each fixing portion can be reduced. Therefore, it is not necessary to enlarge the cross section of the fixing part in order to fix a large number of PC steel wires 4 at one position in the fixing part, and the diameter of the fixing part is set to the anchor fixing part
The diameter can be the same. By the way, according to the trial production by the applicant, assuming that the design allowable anchor force is 100 t (28 PC steel wires), the diameter of the fixing portion (fixing tool 10) in the conventional type shown in FIG. 6 is φ115 mm. On the other hand, in the case of the above embodiment, the diameter is φ78 mm, about 40 mm.
A reduction of mm (30% or more) is expected to be achieved.
Therefore, the hole H for installing the anchor 21 can have the same diameter over its entire length and the same small diameter as the anchor fixing portion 2. As a result, it becomes possible to construct the drilling hole H over the entire length of the anchor by using a single casing pipe of a small diameter, and it is possible to realize a significant cost reduction and shortening of the construction period in the drilling process.

In the fixing tool 22 according to the second aspect of the present invention, in the present embodiment, the steel wire holder portions 33, 43, 53 are provided with slits 36, 46, 56 extending from the respective step portions to the bottom end surface. However, instead of the slit, this may be a through hole reaching the bottom end surface from the step portion. However, if the slit is used as in the present embodiment, the PC steel wire 4 can be fitted from the outer peripheral portion of the steel wire holder portion, which makes the setting extremely easy. Further, in the embodiment, the case where the three connecting type fixing members 30 are connected has been described, but the anchor 21
Since the number of PC steel wires changes depending on the pulling force of, if the number of PC steel wires 4 is less than this, it is possible to use the two-connection type, and if the number is four, the four-connection type, 5 Individual connection type,
Of course, it is possible to configure as. Furthermore, in the embodiment, one PC steel wire 4 is associated with one slit, but when the number of PC steel wires 4 is large, for example, the slit cut amount may be increased. A plurality of PC steel wires 4 may be set in one slit.

〔The invention's effect〕

As explained above, according to the method for fixing a PC steel wire according to the first aspect of the present invention, the fixing of a plurality of PC steel wires is dispersed in several places, and all fixing ends are concentrated on the same cross section. Since this is avoided, it is possible to reduce the diameter of the cross section of each of the dispersed fixing portions. Therefore, it is not necessary to increase the diameter of the cross section of the fixing part in order to fix a large number of PC steel wires in one place, and therefore, drilling is performed over the entire length of the anchor by using one small diameter casing pipe. Therefore, it is possible to significantly reduce the cost and shorten the construction period in the drilling process.

Further, according to the PC steel wire fixing device according to the second aspect of the present invention, the PC steel wire fixing method according to the first aspect of the invention can be realized very easily and surely, and also works as an anchor. One PC that is a pulling member with the required pulling force
It can be reliably transmitted to a steel rod and multiple PC steel wires,
In addition, it is possible to exert an excellent effect such that the number of constituent members can be increased or decreased depending on the tensile force, that is, the number of PC steel wires.

[Brief description of drawings]

1 to 5 illustrate one embodiment of the first and second inventions of the present invention. FIG. 1 is an overall side view showing an anchor in a partially used state in use. , Second
FIGS. 3A to 3D are partial cross-sectional side views showing a connecting member and three connection type fixing members, which are constituent members of the fixing device according to the second invention, and FIGS. ) Are plan views of FIGS. 2 (a) to (d), FIG. 4 is a front view of the fixing portion showing the fixing state of the PC steel wire, and FIGS. 5 (a) and 5 (b) are
The top view and side view which show the fixing end part of PC steel wire. FIG. 6 is a general side view showing the anchor in use in a partial cross section for explaining the conventional technique. FIG. 7 is a side sectional view showing the vicinity of a PC steel wire fixing portion of the anchor shown in FIG. 6 in an enlarged manner. 8th
The figure is a cross-sectional side view assuming the shape of the conventional anchor drilling hole. FIG. 9 is a side sectional view showing an example of a conventional hole drilling by an anchor. 2 ... Anchor fixing part, 3 ... head part, 4 ... PC steel wire, 4a ... end part, 5 ... PC steel rod, 8 ... convex part, 21 ... anchor, 22 ... fixing tool, 23 ... Connection member, 30 ... Connection type fixing member, 30A ... First connection type fixing member, 30B ... Second connection type fixing member, 30C ... Third connection type fixing member, 31,41,51 ...... Connecting screw part, 32,42,52 …… Step part, 33,43,53 …… Steel wire holder part, 34,44,54 …… Screw hole, 36,46,56 …… Slit, G… … Ground, H… Drilling.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Hiroshi Kawakami, 2-16-1 Kyobashi, Chuo-ku, Tokyo Shimizu Construction Co., Ltd. (72) Yoshihiro Takekawa 2--16-1, Kyobashi, Chuo-ku, Tokyo Shimizu Construction (72) Inventor Kazuhiko Araki 15-17 Sakuragaoka-cho, Shibuya-ku, Tokyo Japan Basic Technology Co., Ltd. (72) Inventor Shigetaka Suzuki 15-17 Sakura-oka-cho, Shibuya-ku, Tokyo Japan Basic Technology Co., Ltd. ( 72) Inventor Takeaki Teshima 2-4-10 Higashi-Shimbashi, Minato-ku, Tokyo Joint building KFC Co., Ltd. (72) Inventor Keisuke Morita 2-4-10 Higashi-Shimbashi, Minato-ku, Tokyo Share of building Company KFC (56) References JP-A-54-75807 (JP, A)

Claims (2)

(57) [Claims] 1. A method for fixing an anchor whose grounding body is mainly composed of a plurality of PC steel wires to a tensile portion of the PC steel wire, wherein a plurality of the PC steel wires are provided. The PC steel wire in the anchor is characterized by terminating each of the books at different positions with respect to the arrangement direction, and hooking the PC steel wires terminated at the different positions at their respective end portions. Edge fixing method. 2. The PC in an anchor in which an anchor body embedded in the ground is mainly composed of a plurality of PC steel wires.
A fixing tool for fixing an end portion of a steel wire, comprising a connecting member provided at a tip end portion of a member to which a tensioning force is directly applied by a tensioning means, and sequentially screwed to the connecting member in an axial direction. And a plurality of connection type fixing members, wherein the connection type fixing member has a connecting screw portion protruding at one end and a connecting screw through a stepped portion at the base end of the connecting screw portion. And a steel wire holder portion formed to have a diameter larger than that of the PC steel wire, and the steel wire holder portion has a screw hole that opens at the bottom end surface and is formed to have substantially the same diameter as the PC steel wire. To a plurality of through holes or slits extending from the bottom end surface at equal intervals in the circumferential direction, and further, the steel wire holder portions of the plurality of connection-type fixing members that are sequentially connected to the connecting member respectively include , The one before it is connected The outer diameter of the steel wire holder portion of the fixing type fixing member is reduced by at least the diameter corresponding to the diameter of the two PC steel wires, and is the connection type before the one to which the self is connected. A fixing tool for a PC steel wire in an anchor, which is screwed inside a PC steel wire arranged in a steel wire holder portion of a fixing member.