JPH0663304B2 - Fixing device and fixing method for fiber-reinforced synthetic resin tension material - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a fixing device and a fixing device for fixing a tension member made of fiber reinforced synthetic resin (hereinafter abbreviated as FRP) to a structure such as a ground anchor or a prestressed structure. Regarding the method.

[Problems to be Solved by the Invention]

FRP rods reinforced with carbon fiber, aromatic polyamide fiber, glass fiber, etc. have high tensile strength, corrosion resistance, lightweight, electrical insulation (excluding carbon fiber), etc.,
The use of ground anchors or prestressed concrete structures as tension materials instead of steel materials is drawing attention.

However, these FRP rods have a fixing structure like a conventional steel tension member, for example, a thread is cut on the rod,
It has not been possible to adopt a structure in which a fixing plate or the like is screwed and attached. There is also a proposal to insert the end portion into the tubular body of the fixing tool and fill the adhesive to fix it to the tubular fixing tool, but the organic adhesive and the synthetic resin, which is the base material of the FRP rod, has a shearing force. Therefore, it was difficult to obtain a high fixing strength against drawing.

The present invention has been made in view of the above circumstances. The purpose is to have a high fixing strength between the FRP tension member and the tubular fixing tool, and to fix the structure to a ground anchor body or a prestressed concrete structure, thereby exhibiting a high fixing strength.
It is to propose a fixing device and a fixing method for RP tension material.

[Means for Solving the Problems]

The FRP tension member fixing device according to the present invention is a fixing device for fixing an end portion of a fiber reinforced synthetic resin tension member into which tension is introduced to a structure such as an anchor body of a ground anchor or a prestressed structure. The end of the tension member is inserted into a tubular fixing device, and the expansible grout is filled in the fixing device to fix the same, and the tip of the tension member is a truncated cone side surface on the opposite side of the insertion of the fixing device. It is locked to the fixing tool with a wedge that is divided into the gap with the tension material and hammered in.The inner surface of the hollow part of the fixing tool has unevenness in the longitudinal direction, and the end surface of the tension material has unevenness in the longitudinal direction. Provided,
The tubular fixing device fixed to at least one end of the tension member is characterized in that a thread is cut on the outer periphery, and a screwed nut is tightened so that tension force can be introduced through a washer.

Another method of fixing the FRP tension material is FR.
The tension member made of P is provided with unevenness in the longitudinal direction on the end surface, and the end portion is inserted into the hollow portion of the cylindrical fixing tool having the inner surface provided with unevenness in the longitudinal direction, and the tip is fixed while tensioning the tension material. After inserting the wedge into the gap between the conical trapezoidal side surface on the opposite side of the tool insertion and the tension member, locking it by introducing tension force into the tension member and assumingly attaching it to the structure to be fixed, then fixing It is characterized in that expansive grout is filled in the tool and the tension material is fixed to the fixing tool and fixed to the structure.

When introducing tension to the tension member by the post-tension method, it is not possible to tighten the tension member at the fixed end of the tension member while fixing it to the fixing tool, so the tension member should introduce tension at the fixed end. Instead, the wedges and the expansible grout are fixed to the fixing device, and the fixing device is fixed to a structure such as an anchor body. Therefore, the fixing method of the second aspect of the invention is a fixing method for fixing the tensioned end to the structure.

Hereinafter, the present invention will be described with reference to illustrated embodiments. First
The figure shows the fixing device for this FRP tension material. An end portion of a FRP tension member 1 in which carbon fibers are aligned and molded into a rod with a synthetic resin is inserted into a cylindrical fixing tool 2, and an expansive grout 3 is filled and fixed in the fixing tool 2. The fixing tool 2 is not a simple cylinder, but a lid is provided in front of and behind the hollow portion 4, and a hole for inserting the tendon 1 is provided in this lid. The lid (rear lid) on the opposite side of the tension member 1 from which the tension member 1 is inserted is relatively thick, and the insertion hole has a truncated cone shape that expands outward. As shown in FIG. 3, a wedge 5 divided into three equal parts is driven in the gap between the tension member 1 inserted in the rear lid and the side surface of the rear lid.
The tip end of the tension member 1 inserted in is clamped to the fixing tool 2 by being clamped by a clamping surface having a circular cross section at the center of the wedge 5. Further, as shown in FIG. 2, a large number of annular projections 6 and 6 which are paired symmetrically with respect to the central axis are provided on the inner surface of the hollow portion 4 of the fixing tool 2, and the tip end surface of the FRP tension member 1 is provided. Is provided with a large number of annular projections 7 which are provided at regular intervals. Fixer 2
The end portion of the tension member 1 that has been fixed is embedded and fixed as a fixed end in the anchor body 8 which is a concrete structure.

FIG. 5 shows that the lower end of the FRP tension member 1 is fixed as the fixed end to the fixing tool 2 of FIG. 1 and fixed to the underground anchor body 8.
In this embodiment, the upper end is used as a tension end and a tension force is introduced into the structure 9 on the ground to fix it. The lower end of the FRP tension member 1 is embedded and fixed in the anchor body 8 via the fixing tool 2 as a fixed end. In order to fix the upper end of the tension member 1 to the structure 9, the upper end portion of the FRP tension member 1 is inserted into the tubular fixing tool 2'having the screw 10 cut on the outer peripheral surface thereof to form the FRP tension member 1 While tensioning, the wedge 5 is driven from the upper end of the fixing tool 2'to the upper surface of the fixing tool 2'as in FIG. 1, and the tip of the tension member 1 is locked to the fixing tool 2 '. In this state, the washer 11 is inserted into the fixing tool 2'and the nut 12 screwed therein is tightened to fix the fixing tool 2 '.
Are assumed to be attached to the structure 9. Next, the fixing member 2'is filled with expansive grout and the tension member 1 is fixed to the fixing member 2'to complete the main fixing. It should be noted that the tensioning force applied to the FRP tension member 1 at the time of hypothetical wearing is reduced and the expansive grout is filled into the fixing tool 2 ', and after the grout is cured, the fixing tool 2'on which the tension material 1 is fixed is again provided with a predetermined amount. Nut 1 while introducing tension
It is preferable to complete the main fixing by introducing a predetermined tension force in plural times such as tightening 2.

Also in this embodiment, although not shown, the fixing members 2 and 2'fixed to the upper and lower end portions of the tension member 1 are provided with irregularities in the longitudinal direction on the inner surfaces of the hollow portions, and the tension member 1 inserted into this. Irregularities are also provided in the longitudinal direction on the surface of the end portion of.

The unevenness provided on the end portion of the tension member 1 is formed by spirally winding the resin-impregnated band-like body 13 around the tension member 1 as shown in FIG. Various modes can be adopted, such as

FRP in a state where it is not completely hardened when the tendon 1 is manufactured
It is convenient and rational to press the rod from the periphery to make it uneven.

[Action]

The present invention has the above configuration. In this FRP tension material fixing device, the end of the tension material is inserted into a tubular fixing tool, and the tip is locked by a split wedge driven into the truncated cone of the fixing tool. There are irregularities on the surface of the tension member, and the surface of the end portion of the tension member also has irregularities in the longitudinal direction, and the tension member is in contact with and fixed to the grout and the wedge over the length of the fixing device. Therefore, the shearing force is locally concentrated and does not act on the tension member, and the resin or fiber is unlikely to break or come off, and high fixing strength can be exhibited when the fixing device is fixed to a structure such as an anchor. Further, the tensioning end fixing device fixed to at least one end of the tensioning member has a thread on the outer periphery, and by tightening a screwed nut, it is possible to introduce a tensioning force in the same manner as the conventional steel tensioning member.

In addition, this method of fixing the tension member made of FRP is performed by introducing the tension force into the tension member made of FRP, inserting the end portion thereof into a tubular fixing tool, and driving a wedge into the space between the fixing tool and the tension material. After stopping and posturing, the fixing tool is filled with grout and fixed.
Therefore, the tension force directly acts as a wedge clamping force on the end portion of the tension member, and a high locking force can be applied. Further, since the grout is filled in a stable tension state, no strain or the like is generated after the filling, and it is possible to achieve stable fixation between the tension material and the grout, and the original high fixing strength of this fixing device can be exhibited.

〔The invention's effect〕

The present invention is as described above, and according to the fixing device and the fixing method, high fixing strength can be exhibited when the FRP tension member is fixed.

[Brief description of drawings]

1, 2 and 3 are sectional views and A- of the fixing device of the embodiment.
A sectional view, BB sectional view, FIG. 4 is a side view showing another example of the unevenness of the end portion of the tension member, and FIG. 5 is a longitudinal section of the tension member fixed between the underground anchor body and the above-ground structure. It is a figure. 1 ... FRP tension material, 2 fixing device, 3 grout, 4 ...
Hollow part, 5 ... Wedge, 6 ... Convex strip, 7 ... Projection, 8 ... Anchor body, 9 ... Structure, 10 ... Screw, 11 ... Washer, 12 ... Nut, 13 ... Strip-shaped body.

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Fumio Kinoshita 2-19-1 Tobita-Su, Chofu-shi, Tokyo Kashima Construction Co., Ltd. Technical Research Institute (72) Inventor Satoru Mochida 2-1-11-1 Tobita, Chofu-shi, Tokyo Kashima Construction Co., Ltd. Technical Research Institute (72) Inventor Tsuneo Tanaka 1000 Kamoshida-cho, Midori-ku, Yokohama-shi, Kanagawa Sanryo Kasei Co., Ltd. General Research Institute (72) Inventor Kensuke Yagi 1000 Kamoshida-cho, Midori-ku, Yokohama-shi, Kanagawa Sanryo Kasei Co., Ltd. Research Institute (56) Reference JP-A-60-203762 (JP, A)

Claims (2)

[Claims] 1. A fixing device for fixing an end portion of a tension material made of fiber reinforced synthetic resin to which tension force is introduced, to an anchor body of a ground anchor or a structure such as a prestressed structure. Insert the end into the tubular fixing tool, fill the fixing tool with expansive grout and fix it, and divide the tip of the tension member into the gap between the conical trapezoidal side on the opposite side of the fixing tool and the tension member. It is locked to the fixing tool with a wedge punched in, and unevenness is provided in the longitudinal direction on the inner surface of the hollow part of the fixing tool, and unevenness is also provided in the longitudinal direction on the end surface of the tension material. The cylindrical fixing device fixed to the end has a thread cut on the outer circumference, and the threaded nut is tightened to allow the introduction of tension force through a washer. apparatus. 2. A tense member made of fiber-reinforced synthetic resin is provided with an unevenness in the longitudinal direction on the end surface, and the end portion is inserted into a hollow portion of a tubular fixing tool provided with an unevenness in the inner surface in the longitudinal direction. While tightening the tip, the tip of which is inserted into the gap between the conical trapezoidal side surface on the opposite side of the fixing tool and the tension material is driven and locked, and the tension force is introduced into the tension material to be fixed. A method of fixing a tension member made of a fiber-reinforced synthetic resin, which is characterized by filling an expansive grout into a fixing tool, fixing the tension material to the fixing tool, and fixing the tension material to a structure after being hypothetically attached to the body.