JPH0333834B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for tension-fixing FRP ropes used as tension members for prestressed concrete structures, ropes for joining marine structures, and the like.

(Conventional technology) The conventional tension fixing method for FRP rope is the fifth method.
As shown in the figure, the inner circumferential surface of the wedge W inserted into the through hole of the anchor head H is made uneven, and this inner circumferential surface is brought into contact with the outer circumference of the end of the FRP rope R. The end of the FRP rope R was held and the anchor head H was pulled using a jack (not shown) to fix the rope R under tension.

(Problems to be Solved by the Invention) Although FRP ropes have high tensile strength, their interlaminar shear strength and compressive strength are extremely low, and their surfaces are weak, so they are easily damaged. Therefore, in the above conventional case, the inner circumferential surface of the wedge is uneven;
Due to the concentration of stress on the uneven portions, the rope breaks at a tensile strength lower than the tensile strength, and the tensile strength in the longitudinal direction cannot be fully utilized. Also,
If the smooth wedge described above is used in normal conditions without any special operations, the FRP rope will slip out of the center hole of the wedge and become tensioned due to its extremely slippery surface. It is not possible to fix the adhesive, and even if tension fixing is possible, the fixing efficiency varies and it is extremely difficult to perform stable tension fixing.

In view of the above-mentioned conventional drawbacks, the present invention has been developed to maintain sufficient tension without damaging or falling out of the FRP rope even when tension is applied to the FRP rope by pulling the terminal, and to maintain stable tension. The purpose of the present invention is to provide a tension fixing method for an FRP rope that can be fixed.

(Means for solving the problems) In order to achieve the above object, the present invention provides FRP
A wedge that has a smooth center hole through which a manufactured rope is inserted, and is made up of a plurality of vertically divided bodies and has a conical outer surface as a whole, and a tapered through hole into which the wedge is inserted with its head protruding. using a first anchoring body and a second anchoring body having an anchor head having a
The first fixing body and the center hole jack are arranged at the end of the structure to which the rope is to be fixed, and the second fixing body is arranged at the end of the center hole jack, and the second fixing body is arranged at the end of the center hole jack. An engaging member that engages with the wedge is fixed at a predetermined position on the outer peripheral surface of the rope that protrudes outside of the fixing body of No. 2, and the center hole jack is operated to utilize the tension of the rope to The anchor head of the first anchor body is pushed into the anchor head of the first anchor body while the wedge is pushed into the through hole of the anchor head of the second anchor body and the rope is tensioned through the second anchor body. The gist of this invention is a method for tension fixing an FRP rope, which is characterized by fixing the first fixing body by pushing a wedge into the through hole of the rope.

(Function) The method for tension fixing an FRP rope according to the present invention is as follows:
A wedge that has a smooth center hole through which the rope is inserted and is made up of a plurality of vertically divided bodies and has a conical outer surface as a whole, and a tapered through hole into which the wedge is inserted with its head protruding. using first and second fixing bodies each having an anchor head having an anchor head, and arranging the first fixing body and a center hole jack outside the end of the structure to which the rope is to be fixed; , the second anchoring body is disposed at the end of the ram of the center hole jack, and a locking member that engages with the wedge is provided at a predetermined position on the outer peripheral surface of the rope that protrudes outside of the second anchoring body. Fix the mating member, operate the center hole jack, and use the tension of the rope to push the wedge into the through hole of the anchor head of the second fixing body while pushing the wedge into the through hole of the anchor head of the second fixing body. The rope is tensioned via the fixing body, and in this tensioned state, a wedge is pushed into the through hole of the anchor head of the first fixing body to fix the first fixing body, and the first fixing body is fixed. FRP
The rope can be pulled and stabilized under tension without damaging it.

(Example) Next, regarding one example of the present invention, a plurality of
An example of a case in which FRP ropes are simultaneously stretched and fixed will be explained with reference to the drawings.

FIGS. 1a, b, and c are longitudinal sectional views showing a method for tensioning and fixing an FRP rope according to an embodiment of the present invention.

The first fixing body 1 and the second fixing body 2 used in the FRP rope tension fixing method according to the present invention are as follows:
The wedge 3 is made up of a plurality of vertically divided bodies and has a smooth center hole 3a into which the FRP rope 5 is inserted, and the outer peripheral surface 3c has a conical shape as a whole, and the wedge 3 has a protruding head. The anchor head 4 has a tapered through hole 4a into which the anchor head 4 is inserted. Then, a plurality of ropes 5 are inserted into the through-holes 8a of the bearing plate 8 which is fixed to the end of the concrete structure 10 and has through-holes 8a, and the other end of the ropes 5 is kept in a fixed state. said first on the outside of the end.
The fixing body 1 and the center hole jack 9 are arranged, and the second fixing body 2 is arranged at the outer end of the tensioning ram 13 of the center hole jack 9,
An engaging member 6 that engages with the wedge 3 is fixed at a predetermined position on the outer circumferential surface of the rope 5 that protrudes outside of the second fixing body 2 via a retaining plate 7, and the center hole jack 9 The engaging member 6 is extended by using the tension of the rope 5.
While pressing and pushing the wedge 3 into the through hole 4a of the anchor head 4 of the second anchoring body 2, the rope 5 is tensioned through the second anchoring body 2, and the first The wedge 3 is pushed into the through hole 4a of the anchor head 4 of the fixing body 1 with the pressing ram 14 to fix the first fixing body 1, and the FRP rope 5 is fixed.
Fix the tension without damaging it.

First, devices and members according to embodiments of the present invention will be explained.

In this embodiment, the same wedge 3 and anchor head 4 are used for the first fixing body 1 and the second fixing body 2.

Figures 2a and 2b are a side view and a front view of the wedge, respectively.

The wedge consists of two vertically divided bodies made of a corrosion-resistant material such as ceramics, synthetic resin, or metal, and has a conical outer peripheral surface 3c as a whole, and a central hole 3a through which the rope 5 is inserted. The diameters of both ends of the center hole 3a are slightly larger than the diameter of the rope 5 itself and are expanded outward to prevent unnecessary external force from being applied to the rope 5, and the mutually facing surfaces 3d are each formed by an appropriate thickness. It has a uniformly removed shape and has a stepped groove 3 along the outer circumference near the end on the large diameter side.
f is provided. Further, the wedge 3 has an inner peripheral surface 3e finished in a smooth state with no irregularities, and is inserted into the through hole 4a of the anchor head 4 with the head 3b protruding.

FIG. 3a is a front view showing the anchor head, and FIG. 3b is a sectional view taken along line AA in FIG. 3a.

The anchor head 4 has a short cylindrical shape made of a corrosion-resistant material such as ceramics, synthetic resin, or metal, and has a plurality of through holes 4a into which the wedges 3 are inserted at predetermined angular intervals. Inner peripheral surface 4b of 4a
is tapered to correspond to the outer circumferential surface 3c of the wedge 3, and small internal threads 4c are formed at three locations between the through holes 4a at equal angular intervals.

The FRP rope 5 is made by twisting together a plurality of wire rods made of matrix resin and a plurality of single fibers. The fibers are threaded, drawn, covered with a covering material, twisted, and molded and cured.The single fibers are preferably inorganic glass fibers, carbon fibers, organic aromatic polyamide fibers, etc., and the matrix resin Thermosetting resins such as epoxy resins, unsaturated polyester resins, and diallyl phthalate resins containing curing agents are suitable.

FIG. 4 is a perspective view showing the engaging member.

The engaging member 6 has a pair of clamping pieces 6a, 6a, and each clamping piece 6a, 6a has an uneven engagement surface 6b, 6b at the tip that engages with the outer periphery of the rope 5. The tip can be opened and closed by opening and closing operations, and the side surface is placed in contact with the end surface of the retaining plate 7 interposed between the wedge 3 and the wedge 3. Then, the engagement member 6 sandwiches the rope 5 between the engagement surfaces 6b, 6b, grips the handle part 6c with a hand, performs a closing operation, presses the rope 5 from the outer periphery, and pinches the rope 5, When a claw (not shown) is hooked, it is held in that state and fixed at a predetermined position, and when the claw is removed, the holding is released. The retaining plate 7 has a through hole 7a through which the rope 5 is inserted, and a through hole (not shown) corresponding to the small internal thread 4c of the anchor head 4, and a bolt (not shown) inserted through this through hole is inserted into the small internal thread 4c. It is screwed together and fixed to the anchor head 4 to prevent the wedge 3 from shifting.

The bearing plate 8 has a through hole 8a through which the rope 5 is inserted, and is fitted into a recess provided at the end of the concrete structure 10.

The center hole jack 9 includes a ram chair 11 whose tip abuts against the end surface of the concrete structure 10, a cylinder 12 having a center hole through which the rope 5 is inserted, and a cylinder 12 for supplying pressure oil into the cylinder 12. Tensioning ram 13 that twists in and out
A pressing ram 14, etc., which moves in and out separately from this ram 13 is provided, and the movement of the ram 13 and ram 14 applies tension to the rope 5 via the second fixing body 2, and also applies tension to the rope 5 through the second anchor 2. 1 fixing body 1
The wedge 3 can be pushed into the through hole 4a of the anchor head 4.

Next, an example of the method for tension fixing an FRP rope according to the present invention will be explained.

In FIG. 1a, a cavity 10a is formed between both ends of the concrete structure 10, bearing plates 8, 18 are fixed to both open ends of the cavity 10a, and through holes 8a, 18a of the bearing plates 8, 18 are fixed. A sheath 15 whose tip fits onto the inner periphery of the sheath 15 is provided. A fixing body 19 equipped with a wedge 3 and an anchor head 4 is placed at the end of the rope 5 on the other end side Y of the concrete structure 10 in contact with the bearing plate 18, and the retaining plate 17 and the engagement member 16 are placed in contact with the bearing plate 18. Secure in place. At one end side X of the concrete structure 10, the rope 5 is inserted through the through hole 8a of the bearing plate 8, and the head 3b of the wedge 3 is inserted into the first anchoring body 1 having the wedge 3 and the anchor head 4 through the through hole. 4a, the retaining plate 7 is attached, and the center hole jack 9 supported by the ram tie air 11 whose tip is in contact with the end face of the concrete structure 10 is placed at a predetermined position, and the center hole jack 9 is placed in a predetermined position. The second fixing body 2 is placed in contact with the outer end of the tensioning ram 13 of the hole jack 9, and the retaining plate 7 and the engagement member 6 are attached to the second fixing body 2 in this order. Fix it in a nearby predetermined position. By extending the center hole jack 9, the engagement member 6 presses the head 3b of each wedge 3 using the tension of the rope 5, and the anchor head 4 of the second fixing body 2 is penetrated. While pushing each wedge 3 into the hole 4a, the rope 5 is kept under tension via the second fixing body 2, and as shown in FIG. 1b, in this state, the center hole jack 9
After fixing the first fixing body 1 by pressing the wedge 3 into each through hole 4a of the anchor head 4 of the first fixing body 1 using the pressing ram 14, as shown in FIG. As shown in c, the second fixing body 2 and center hole jack 9 are removed. In this way, the rope 5 is fixed to the concrete structure 10 with the required tension applied thereto.

According to the above embodiment of the present invention, the anchoring bodies 1, 2 and 19 can all use the same wedge 3 and anchor head 4, and the retaining plates 7, 17 can also use the same one. Since it does not require a nut to be screwed into the anchor head 4, it is very convenient and low-cost because it requires fewer types of parts.

The tension fixing method for FRP ropes according to the present invention can be used for industrial applications such as ropes for joining structures near the coast, terminal processing of communication cables that are lightweight and require high tensile strength and electrical insulation, and reinforcement ropes for suspension bridges. It can also be applied to the ends of FRP ropes as reinforcing materials, and the FRP rope may be of any type such as spiral type, strand type, etc., and the wedge is not limited to two parts, but can be divided into three or more parts. It may be divided into

(Effects of the Invention) The present invention is constructed as described above, and includes a wedge which has a smooth center hole into which an FRP rope is inserted, and which is made up of a plurality of vertically divided bodies and whose outer peripheral surface as a whole has a conical shape. and an anchor head having a tapered through hole into which the anchor head is inserted with the head protruding, and are arranged at the end of the structure to which the rope is to be anchored. An engaging member that engages with the wedge is fixed at a predetermined position on the outer circumferential surface of the rope that protrudes outward from the second fixing body disposed at the end of the ram of the center hole jack. and tensioning the rope through the second anchoring body while pushing the wedge into the through hole of the anchor head of the second anchoring body with the engaging member by operating the tensioning force of the rope. This allows the rope to be reliably tensioned without damaging it, and in the tensioned state, the anchor head of the first anchoring body is placed at the end of the structure to which the rope is to be anchored. By pushing a wedge into the through hole and fixing the first fixing body, it is possible to maintain sufficient tension and perform stable tension fixing.

[Brief explanation of the drawing]

Figures 1a to 1c are FRPs according to embodiments of the present invention.
A partially longitudinal side view showing a tension fixing method for a manufactured rope;
Figures 2a and b are side and front views showing the wedge, respectively; Figure 3a is a front view showing the anchor head;
FIG. 4 is a perspective view showing an engaging member, and FIG. 5 is a longitudinal sectional view showing a conventional rope tension fixing method. 1... First fixing body, 2... Second fixing body, 3...
Wedge, 3a...center hole, 3b...head, 3c...outer peripheral surface,
3d...Mutually opposing surfaces, 3e...Inner peripheral surface, 3f...Stepped groove, 4...Anchor head, 4a...Through hole, 4b...
Inner peripheral surface, 4c... Small internal thread, 5... Rope, 6... Engaging member, 6a... Clamping piece, 6b... Engaging surface, 6c... Hand grip portion, 7... Retaining plate, 7a... Through hole, 8... Bearing plate , 8a... Through hole, 9... Center hole jack, 10... Concrete structure, 10a
...Cavity, 11...Ram chair air, 12...Cylinder, 13...Tensioning ram, 14...Pressing ram, 15
... Sheath, 16... Engaging member, 17... Retaining plate, 18... Bearing plate, 18a... Through hole, 19...
Fixation body.

Claims (1)

[Claims] 1. A wedge that has a smooth center hole through which an FRP rope is inserted and is made up of a plurality of vertically divided bodies and has a conical outer surface as a whole, and a tapered wedge that is inserted with the wedge's head protruding. A first fixing body and a second fixing body each having an anchor head having a through hole are used, and the first fixing body and the center hole jack are attached to the end of the structure to which the rope is to be fixed. At the same time, the second fixing body is placed at the end of the center hole jack, and the wedge is engaged with the wedge at a predetermined position on the outer peripheral surface of the rope protruding outside of the second fixing body. Fixing the engaging member, operating the tensioning ram of the center hole jack, and using the tensioning force of the rope, the engaging member pushes the wedge into the through hole of the anchor head of the second fixing body. while stretching the pressing ram of the center hole jack and pushing the wedge into the through hole of the anchor head of the first anchor while keeping the rope under tension through the second anchor. A method for tension fixing an FRP rope, the method comprising fixing the first fixing body.