JP2023012901A - Connector of pc tendon - Google Patents

Abstract

To provide a connector which is simple in assembly and disassembly of a connector, improves working efficiency, and achieves reduction of manufacturing time and a manufacturing cost of a PC member.SOLUTION: A connector is composed of a housing part 10 having a hollow part 11, wedge body holder parts 20 formed on both end sides of the housing part 10, a wedge body 30 for holding a PC tendon T, and a set jig 40 for pressing the wedge body 30. The set jig 40 includes pressing parts 42 formed on both ends, and the pressing part includes a horseshoe-shaped space part 41 to which the PC tendon T can be inserted, and a connection part 43 for connecting between the pressing parts. The set jig 40 is arranged from an opening 12 in the state where the PC tendon T is sandwiched by the horseshoe-shaped space part 41 of the set jig 40, and the pressing part 42 of the set jig 40 can press the wedge body 30 to the wedge body holder part 20 in the state where the wedge body 30 holds the PC tendon T.SELECTED DRAWING: Figure 1

Description

The present invention relates to a connector for PC tendons, and more particularly, in the manufacture of PC members using PC tendons, a PC tension used for connecting a tensioning device and a PC tendon or for connecting PC tendons to each other. It relates to a material connector.

In general, a connector for PC tendons is used as a connector for axially connecting reinforcing bars for tensioning used in PC members and PC tendons such as PC steel wires.

Conventionally, a PC member using a PC tendon to which prestress is introduced by a pretension method is manufactured using a formwork for the PC member. In other words, in order to manufacture a plurality of PC members, a predetermined number of PC tendons are hung over a formwork at predetermined positions, and concrete is poured into the formwork.
There, a plurality of forms and prestressed concrete tendons of a predetermined length are arranged and used between strong reaction bodies installed at both ends of a section of ten-odd meters to several dozen meters. Connection with a tensioning device and connection between PC tendons are required.

In general, to manufacture a PC member with a plurality of forms, forms are arranged in rows, and PC tendons are placed in the forms arranged in rows. One end of the arranged PC tendon is fixed to the reaction force body, and the other end is connected to a tensioning device that is tensioned by a jack, or the connection between the PC tendons is aligned in the axial direction and connected. At this time, each connection (joint) is connected via a connector.

In other words, when manufacturing PC members (prestressed concrete), for example, the connector of the PC tendon is placed outside the formwork for manufacturing the PC member, and the PC tendon is placed in the formwork while being tensioned. Concrete is poured into the frame, and when the concrete develops a predetermined strength, the tension of the PC tendon is released and the connector of the PC tendon is removed, and this connector is reused.

Commonly used PC tendon connectors use conical wedges that are separated into 2 or 3 blades at both ends of a cylindrical metal body, and the tension of the PC tendon It is a structure in which the wedge edge shape is bitten into the PC tendon through sliding and connected.

For example, Patent Literature 1 discloses a cylindrical coupler having a gripping portion for screwing in the center of the outer periphery and female threads screwed on the inner walls at both left and right ends thereof, and the female threads on the outer periphery of the front portion of the cylindrical body. a pair of left and right chuck bodies having a male threaded portion to be screwed with the chuck body, and having a tapered fitting that tapers toward the rear end in the cylindrical interior; and a split wedge gripping the PC steel strand on its inner wall surface, wherein a high A technique is disclosed in which strong metal cylinders are interposed in contact with both end surfaces of the wedges.

In general, since a tension of several tens of kilonewtons is applied to each PC tendon, the wedge engaged with the PC tendon minimizes its slippage and ensures safety. There is a need to. In addition, since the operability at the time of manufacture is greatly related to work efficiency, the shape and length of the wedge blade are determined for each steel material diameter of the PC tendon.

JP 2004-100444 A

When conventional PC tendon connectors are used to connect high-strength rebars, the connectors and wedges are strongly coupled, and the high-strength rebars bite into the wedges provided on the connectors. When removing the high-strength reinforcing bars after the tension is released, there is a problem that the removal becomes difficult.

Further, in the conventionally used PC tendon connector, when the PC tendons are connected to each other, the PC tendon is pulled and moved to be inserted into the connector. Therefore, work efficiency was poor. In addition, when the tensioning device or the reaction force body and the PC tendon are connected by a connecting tool, the state of connection cannot be visually confirmed, resulting in poor working efficiency.
Thus, there is a need for a PC tendon connector that facilitates removal of the high-strength rebar from the connector and the removal of the wedge and high-strength rebar.

In addition, there is a demand for a connector technology that can efficiently connect PC tendons to each other without pulling and moving the PC tendons when connecting the PC tendons to each other using a connector. rice field.

It is an object of the present invention to facilitate the assembly and disassembly of the PC tendon connector when connecting a tensioning device or a reaction force body to a PC tendon, or when connecting PC tendons to each other, thereby improving work efficiency. To provide a connecting tool for PC tendon capable of improving the strength of the PC member, shortening the manufacturing time of the PC member, and reducing the manufacturing cost.

The above-mentioned problem is solved by a connector for PC tendons according to the present invention, which is a connector for PC tendons for connecting PC tendons, wherein the connector includes a hollow portion forming a main body. a housing, a wedge holder holding a wedge on at least one of one end side and the other end side of the housing, and the wedge arranged in the wedge holder and holding the PC tendon. and a set jig that presses the wedge body. The housing part includes the hollow part that communicates with the wedge body holder part, and a part of the hollow part that is open to the atmosphere. and a wedge holder installation portion for mounting the wedge holder portion. An arrangement portion capable of arranging a PC tendon and a connection portion connecting between the pressing portions are provided. The PC tendon is positioned and mounted, and the wedge body can be pressed against the wedge holder part while holding the PC tendon by the pressing part of the set jig. resolved by

In the connector of the PC tendon of the present invention, the opening opened to the atmosphere is formed in the casing of the connector, so that it is possible to visually check the PC tendon and the wedge between the outside and the inside of the connector. It is possible to easily move the wedge body and the PC tendons inside the connector.

In addition, even if the PC tendon is not pulled and moved, the connector itself can be moved to hold the PC tendon on the connector. Therefore, since it is possible to easily assemble and disassemble the connector when manufacturing the PC member, it is possible to shorten the manufacturing time and reduce the manufacturing cost of the PC member using the PC tendon. .

In addition, since the structure of the connector of the PC tendon is extremely simple and has excellent durability, it is easy to replace and manage parts, and it is possible to improve work efficiency. It is possible to reduce the overall cost.
It is preferable that the PC tendons are arranged in a state in which the axial directions of the one end side and the other end side of the casing portion are aligned. As a result, the axial directions of the prestressing tendons are aligned and the connection can be made, and the tension applied to the PC tendon can be tensed without causing deviation in the axial direction.

At this time, the wedge holder portion includes a PC tendon insertion hole provided on one end side of the wedge holder portion, a wedge mounting hole provided on the other end side of the wedge holder portion, and the PC tendon insertion hole. It is preferable to comprise a knob portion formed on the hole side and a male screw portion formed on the outer peripheral portion continuously with the knob portion.

With this configuration, the wedge holder portion is screwed into the female thread portion of the casing by rotating the knob portion so that the external thread portion formed continuously from the knob portion is formed on the outer peripheral portion. It can be attached and assembled integrally with the housing.

The wedge body includes a plurality of divided bodies divided in the circumferential direction, a blade-shaped portion formed on the inner surface of the divided bodies, and a PC tendon formed by the plurality of divided bodies through which the PC tendon is inserted. It is preferable to comprise a through hole and a wedge body connector for integrating the divided bodies.
In this way, since the wedge body is composed of a plurality of divided bodies divided in the circumferential direction, even if the blade portion of the wedge body is biting into the PC tendon, each divided body can be individually peeled off from the PC tendon. is easily possible.

Furthermore, it is preferable that the pressing portion of the setting jig is provided with an arrangement portion for arranging the PC tendon. In this way, since the pressing portion is provided with the arranging portion for arranging the PC tendon, when connecting the PC tendons, the PC tendon is regulated by the arranging portions formed in the pressing portions at both ends. and can be arranged so that the axial directions coincide.

At this time, the pressing portion is tapered from the wedge pressing surface toward the connecting portion on the free end side. That is, it is preferable that the free end side (the surface opposite to the connecting portion) is tapered from the wedge pressing surface toward the connecting portion. The tapered portion allows the setting jig to be easily arranged between the wedges, and the connecting portion of the setting jig can be forcibly inserted into the wedge-holder by the wedge-pressing surface by using a hammer or the like. Play between the wedge and the wedge holder can be eliminated.

By using the set jig, it is possible to reliably hold the wedge on the housing and to reliably connect the PC tendons linearly in the axial direction. That is, the pressing portion of the setting jig can reliably press the wedge against the wedge holder, thereby removing play and reducing set loss.

According to the connector of the PC tendon of the present invention, the wedge body can be easily moved between the outside and the inside of the connector by forming the opening opened to the atmosphere in the connector. It is possible to connect the PC tendon to the wedge inside the connector while visually checking the wedge and the PC tendon.

Further, even if the PC tendon is not pulled and moved, the connector itself can be moved and the wedge body and the PC tendon can be engaged with the connector while visually checking.
Further, when manufacturing the PC member, it becomes easy to connect the PC tendon to another PC tendon, and to connect and dismantle the PC tendon and the threaded reinforcing bar attached to the screwing holder. In addition, since it is possible to easily assemble and disassemble the connector of the PC tendon, it is possible to shorten the manufacturing time and reduce the manufacturing cost of the PC member while ensuring the strength of the connecting portion. .

In addition, the structure of the connector for PC tendons and threaded rebars is extremely simple and has excellent durability, so it is easy to replace and manage parts, and work efficiency can be improved. , it is possible to reduce the overall manufacturing cost of the PC member.

In addition, the set jig makes it possible to easily attach the wedge body by pressing it against the wedge holder placement portion of the housing, and when connecting the PC tendons to each other or the PC tendon and the threaded reinforcing bar. It is possible to linearly connect the PC tendons and threaded reinforcing bars in the axial direction.
In this way, the setting jig can eliminate play in the wedge body and reduce set loss, so that the quality of the manufactured PC member can be ensured.

It is a perspective view explaining one embodiment of the connector concerning the present invention. FIG. 4 is a plan view for explaining the housing part to which the wedge body holder part of the connector according to the present invention is attached; FIG. 2 is an exploded explanatory view of FIG. 1; FIG. 2 is an explanatory view of a wedge body holder portion of FIG. 1; (a) is a perspective view of a wedge, and (b) is a perspective view of an engagement state with a PC tendon. 5B is an explanatory diagram of the wedge body of FIG. 5A; FIG. FIG. 5B is an explanatory diagram of a divided body that constitutes the wedge body of FIG. 5A; The O-ring of FIG. 5A is shown, (a) is a top view, (b) is a side view of the arrow direction of (a). 1 is a perspective view of a set jig according to one embodiment of the present invention; FIG. It is the figure seen from the arrow direction of FIG. 6A. (a) is an explanatory diagram of mounting the set jig in FIG. 6A, and (b) is an explanatory diagram of the mounting. (a) to (d) are explanatory diagrams of the assembly situation of the PC tendon connector. (e) to (h) are explanatory diagrams of the assembly situation of the PC tendon connector. (i) to (k) are explanatory views of the assembly situation of the PC tendon connector. (l) to (m) are explanatory diagrams of the assembly situation of the PC tendon connector. It is explanatory drawing of the use condition of the PC tendon connection tool in the case of manufacturing one PC member. It is explanatory drawing of the use condition of the PC tendon connection tool in the case of manufacturing multiple PC members. (a) to (d) are explanatory diagrams of the dismantling situation of the PC tendon connector. (e) to (h) are explanatory diagrams of the dismantling situation of the PC tendon connector. (i) to (l) are explanatory diagrams of the dismantling situation of the PC tendon connector. It is explanatory drawing of the connection tool which shows 2nd Embodiment. FIG. 11 is an explanatory diagram of the connection between the connector of FIG. 10 and the PC tendon. FIG. 10 is an explanatory diagram when a set jig is mounted; FIG. 10 is an explanatory diagram of a usage situation when manufacturing a PC member using the connector of the second embodiment;

An embodiment of the present invention (hereinafter referred to as the present embodiment) will be described below with reference to the drawings. The members, arrangement, etc., described below do not limit the present invention, and can be modified in various ways within the scope of the present invention, and the dimensions described below are merely examples.

As shown in FIGS. 1 and 3, the connector 1 of the PC tendon T of the present embodiment is mainly composed of a housing portion 10, a wedge body holder portion 20, a wedge body 30, a set jig 40, and the like. element.

The housing part 10 of the present embodiment constitutes the main body of the PC tendon connector 1, is formed in a cylindrical shape, has a longitudinal length of about 260 mm, and an outer diameter of about 65 mm to 80 mm. be. Its material is steel. It should be noted that the dimensions of the housing section 10 and various dimensions of the components other than the housing section 10 to be described later can take various values in terms of width as long as they follow the gist of the present invention. etc. is not fixed or limited.
Then, as shown in FIG. 2 , the housing section 10 includes a hollow section 11 , an opening section 12 , a wedge holder installation section 13 and a wedge placement base 50 .

The hollow portion 11 of the present embodiment is formed substantially in the center of the housing portion 10 in the longitudinal direction. , and communicates with the wedge holder installation portion 13 . This hollow portion 11 is also a space in which a set jig 40, which will be described later, is mounted.

The hollow part 11 has a length of about 160 mm in the longitudinal direction of the housing part 10 and a width of 50 mm in the lateral direction perpendicular to the length direction so that the set jig 40 can be attached to the housing part 10. The height direction from the bottom surface of the housing part 10 is about 40 mm.
The opening 12 of the present embodiment is formed by cutting out a part (upper side in this example) of the hollow portion 11 in a substantially rectangular shape and is open to the atmosphere.

As shown in FIGS. 2 and 3, the wedge holder installation portions 13 of the present embodiment are formed at both longitudinal end portions of the housing portion 10, and are hollow so that the wedge holder portions 20 can be mounted thereon. It has become.
That is, in this embodiment, a female threaded portion 13b is provided on the inner periphery of the wedge holder installation portion 13 so that the male threaded portion 24 of the wedge holder portion 20 can be screwed. The size of the female threaded portion 13b is formed to match the male threaded portion 24 of the wedge holder portion 20. In this embodiment, the length is about 40 mm and the inner diameter is about 50 mm.

As shown in FIG. 2, the wedge mounting base 50 is composed of a wedge fitting groove 50a and a set jig mounting surface 50b. The wedge fitting groove 50a is located at the bottom of the housing 10 between the wedge fitting opening 23a formed on one end side and the wedge fitting opening 23a formed on the other end side. is formed by the long groove of
Also, the set jig installation surface 50b is formed on the lateral lower side of the housing portion 10 and above the wedge body fitting groove 50a.

The set jig installation surface 50b is designed to press the wedge body of the set jig 40 when the later-described set jig 40 is hit by a hammer or the like from the upper portion of the connecting portion (striking portion) 43 and is inserted between the wedge bodies 30. It abuts on the free end side end of the portion 42 .
After the wedge 30 is connected to the PC tendon T at the position of the hollow portion 11, the wedge 30 is moved to the wedge fitting opening 23a while sliding in the wedge fitting groove 50a, and fitted into the tapered portion 23b.
The wedge body fitting groove 50a is substantially the same as the larger outer diameter of the wedge body 30, but is formed slightly larger than the larger outer diameter of the wedge body 30 so that the wedge body 30 can slide. ing.

As described above, the wedge holder 20 of the present embodiment holds the wedge 30 and is provided at one end and the other end of the casing 10 . The wedge holder portion 20 is made of steel and has a longitudinal length of about 60 mm and an outer diameter of about 50 mm.
The wedge body holder portion 20 is formed in a cylindrical shape, and a portion of about 20 mm from the PC tendon insertion opening 22 serves as a knob portion 25 that is not threaded.
A male threaded portion 24 is formed continuously with the knob portion 25, and the male threaded portion 24 is configured to be screwed with the female threaded portion 13b formed on the wedge holder installation portion 13 described above.

More specifically, the wedge holder portion 20 is formed with a PC tendon insertion hole 21 , a wedge mounting hole 23 , a male screw portion 24 and a knob portion 25 . A PC tendon insertion hole 22 is formed on the end side of the knob portion 25, and the size of the PC tendon insertion hole 22 is formed according to the thickness of the PC tendon T. In this embodiment, the hole diameter is about 16 mm in accordance with the PC tendon T.
Each wedge holder portion 20 is screwed to the wedge holder installation portion 13 at both ends of the housing portion 10 , and the wedge holder portion 20 is integrally attached to the housing portion 10 .

A wedge mounting hole 23 is formed on the opposite side of the PC tendon insertion opening 22 of the wedge holder portion 20 . In this embodiment, the size of the wedge mounting hole 23 is formed with a length that can accommodate the wedge 30, and is about 40 mm in this embodiment.
The wedge mounting hole 23 has a wedge fitting opening 23a and a tapered portion 23b tapered from the wedge fitting opening 23a toward the PC tendon insertion opening 22. As shown in FIG. The tapered portion 23b is a portion into which the wedge 30 is fitted, and is provided on the inner wall surface of the wedge mounting hole 23. As shown in FIG. The inner wall shape of the tapered portion 23b substantially matches the outer shape of the wedge body 30. As shown in FIG.

As described above, the male threaded portion 24 of the wedge holder portion 20 is a portion that screws together with the female threaded portion 13b of the wedge holder installation portion 13, and is formed on the outer peripheral portion of the wedge holder portion 20 other than the knob portion 25. ing. The male screw portion 24 of the wedge body holder portion 20 of this example is formed at a portion approximately 40 mm from the side of the wedge body fitting opening 23a.

The wedge body 30 of this embodiment is made of steel, and as shown in FIG. consists of And, as shown in FIG. 5C, inside these three divided bodies 30a, 30b, and 30c, continuous cutting edge portions 32 are formed at regular intervals in the direction perpendicular to the longitudinal direction.
Further, the O-ring fixing groove 35 is formed on the outer periphery of the end portions of the divided bodies 30a, 30b, and 30c having a larger diameter.
That is, as shown in FIG. 5B, the divided bodies 30a, 30b, and 30c of the present embodiment are obtained by dividing the wedge body 30 into three in the circumferential direction, and the circumferential end surfaces of the divided bodies 30a, 30b, and 30c are brought into contact with each other. The wedge body 30 is constructed by allowing the

In this manner, the wedge 30 is integrally assembled with the divided bodies 30a, 30b, and 30c by the wedge-connecting O-ring 34. As shown in FIG. That is, as shown in FIG. 5C, the O-ring fixing groove 35 is formed on the outer peripheral surface of the divided bodies 30a, 30b, and 30c on the enlarged diameter side, and is formed so as to match the shape of the wedge connecting O-ring 34. ing. The groove width is 3 mm and the groove depth is 2 mm.
As shown in FIG. 5A(a), the wedge body 30 in the assembled state (whole) is formed in a conical shape with a reduced diameter in alignment with the tapered portion 23b of the wedge body holder portion 20 shown in FIG. .

The wedge connecting O-ring 34 is made of resin such as rubber, and as shown in FIG. The blade portion 32 bites into and holds the PC tendon T by tightening the wedge connecting O-ring 34 .
The length of the wedge body 30 in this embodiment in the longitudinal direction is 50 mm, and the outer diameter of the enlarged diameter portion is 29.8 mm.

As shown in FIG. 5A(b), after the three divided bodies 30a, 30b, and 30c are integrated by the wedge connecting O-ring 34 to form the wedge 30, the wedge 30 is engaged with the PC tendon T. match. Then, the tapered portion 23b of the wedge body holder portion 20 causes the blade portion 32 to strongly bite into the PC tendon T and is strongly fitted into the tapered portion 23b, so that the PC tendon T is formed in the PC tendon through-hole 33 with a blade shape. It is firmly sandwiched by the portion 32 .

As shown in FIG. 5A(a), the PC tendon through-hole 33 is an insertion hole for the PC tendon T formed inside the wedge body 30. As shown in FIG. The PC tendon through-hole 33 has a length of 50 mm and a hole diameter of 15 mm on the enlarged diameter side and 12 mm on the reduced diameter side.
As shown in FIG. 5B, the PC tendon T is inserted into the PC tendon through-hole 33 from the reduced diameter portion side of the wedge 30, and the divided bodies 30a, 30b, and 30c are connected to the wedge connecting O-ring 34 portion. It separates as a starting point, and the PC tendon through-hole 33 expands in diameter. As shown in FIG. 5A(b), the PC tendon through-hole 33 is enlarged in diameter, and a clearance 36 is formed in the axial direction on the end surfaces of the three divided bodies 30a, 30b, and 30c.

As shown in FIG. 5D, the wedge connecting O-ring 34 is circular and matches the shape of the enlarged portion of the wedge 30 . The wedge connecting O-ring 34 has an outer diameter of 25 mm, an inner diameter of 20 mm, and a width of 2 mm.
The wedge-connecting O-rings 34 are classified by size to distinguish between the wedge-connecting O-rings 34 with a diameter of 13 mm for the high-strength reinforcing bars and the wedge-connecting O-rings 34 with a diameter of 16 mm for the high-strength reinforcing bars. It is preferable to color-code the wedge connecting O-rings 34 .

As shown in FIG. 6A, the setting jig 40 is generally U-shaped as a whole and made of steel, and its size is 140 mm in the longitudinal direction and 45 mm in the width direction. The set jig 40 includes a horseshoe-shaped space portion 41 as an insertion portion through which the PC tendon T can be inserted, a wedge pressing portion 42, and a connecting portion 43 (hitting portion).
The horseshoe-shaped space 41 of this embodiment is formed on one end side and the other end side (that is, both ends side) of the setting jig 40 .

The horseshoe-shaped space portions 41 at both ends are cutout portions formed in the center of the wedge pressing portion 42. The horseshoe-shaped space portions 41 sandwich the PC tendon T and regulate the PC tendon T in the axial direction. be.
As shown in FIG. 6B, when the set jig 40 is mounted at a predetermined position in the hollow portion 11 from the opening portion 12, the PC tendon T is regulated in the horseshoe-shaped space portion 41, and the PC tendon T is straight in the axial direction. is strategically located.

As shown in FIGS. 6A and 6B, the wedge-pressing portions 42 are substantially rectangular prisms on both end sides of the set jig 40. and a tapered portion 42b.
The size of the wedge pressing portion 42 is 40 mm in the vertical direction and 40 mm in the horizontal direction, and the thickness is 17 mm on the upper end side and 10 mm on the lower end side.

The pressing portion 42 a is a surface into which the wedge 30 is pressed and fitted when the wedge 30 is fitted into the wedge holder portion 20 by the set jig 40 .
The size of the pressing portion 42a is 20 mm in the vertical direction, 20 mm in the horizontal direction, and 17 mm in thickness.

The connecting portion 43 (hitting portion) connects the pressing portions 42a at both ends (that is, is formed between one end and the other end of the set jig 40), and is formed in a substantially quadrangular prism shape. The size of the connecting portion 43 (hitting portion) is 140 mm in the longitudinal direction, 20 mm in the width direction, and 25 mm in the height direction.
The connecting part 43 (striking part) is used when the wedge body 30 is press-fitted by striking from above when mounting the setting jig 40 , and is used when the set jig 40 is moved. part) is also used.

The tapered portion 42b is a tapered surface that allows the pressing portion 42a to be positioned between the wedges 30 in order to facilitate the attachment of the wedges 30 to a position where the wedges 30 are press-fitted. The size of the tapered portion 42b is 20 mm in the vertical direction and 20 mm in the horizontal direction, and the thickness is 17 mm on the upper end side and 10 mm on the lower end side.

In addition, although not shown in the drawings, in order to prevent the casing 10 from falling when the casing 10 is placed on a horizontal surface such as the ground, the casing overturn prevention part 60 is attached to the lower outer peripheral surface of the casing 10 . can be set to The shape of the housing overturn prevention part 60 can be a semi-cylindrical shape, a quadrangular prism shape, or the like, but is not limited to this.

As the PC tendon T, for example, a high-strength reinforcing bar (for example, MK785) having a yield point of 590 to 1275 N/mm2 is used, and the diameter of the high-strength reinforcing bar is preferably 13 mm or 16 mm. In order to distinguish whether the high-strength reinforcing bars have a diameter of 13 mm or 16 mm, it is desirable to perform markings according to size.

As shown in FIGS. 8A and 8B, in the method of using the connector 1 for the PC tendon T when manufacturing a PC member, reaction force bodies 70 are arranged at both ends of a predetermined section, and one reaction force body 70 A jack 80 is installed on the side.
The PC tendon T is stretched between the reaction bodies 70 and fixed to the tension-side reaction body 70 provided with the jack 80 and the reaction-force receiving side reaction body 70 .

The jacks 80 are provided according to the number of the PC tendons T spanned between the reaction members 70 . Forms 90 for manufacturing PC members are provided between the reaction bodies 70 at both ends according to the number of PC members to be manufactured, and the forms 90 are provided with PC tendon penetration holes.
In this case, according to the length of the PC tendon T, a predetermined number of connectors 1 of the PC tendon T are provided at predetermined positions outside the formwork 90 of the PC member. The ends of the PC tendons T facing each other are connected to the connectors 1 of the PC tendons T, and the PC tendons T are connected in the axial direction.

Next, how to use the connector 1 of the PC tendon T having the above configuration will be described in FIGS. 7A (a) to (d), FIGS. 7B (e) to (h), 7D (l) to (m), FIGS. 9A (a) to (d), FIGS. 9B (e) to (h), and FIGS. 9C (i) to (l). In addition, in this example, the connector 1 of the PC tendon T that connects the PC tendon T facing each other will be described.

First, the assembly of the connector 1 of the PC tendon T will be described. As for the assembly method, as shown in FIG. 7A(a), the wedge holder portion 20 is screwed into the wedge holder installation portion 13 from both end sides of the housing portion 10. As shown in FIG. Then, as shown in (b) of FIG. 7A, the PC tendon T is inserted into the PC tendon insertion hole 21 from one side.
Next, as shown in FIGS. 7A(c) to (e), a wedge body 30 is attached to the inserted PC tendon T from the opening 12 side (FIGS. 7B(c) and (d)). At this time, as shown in FIG. 5A(b), the wedge body 30 and the PC tendon T are assembled. After placing the wedge 30 at a predetermined position on the PC tendon T (FIG. 7B(e)), the PC tendon T is pulled toward the PC tendon insertion hole 21 and inserted into the wedge mounting hole 23 .

As shown in (g) to (j) of FIG. 7B, the PC tendon T is inserted into the PC tendon insertion hole 21 from the other side. At this time, as shown in FIG. 7C(j), the PC tendon T is inserted into the wedge mounting hole 23 on the same axis.
Next, the setting jig 40 is arranged from the opening 12 to the hollow portion 11. At this time, the pressing portion 42a is positioned between the wedges 30, and the taper portion 42b is formed so that the wedges 30 can be pressed. First, it enters between the wedges 30 and presses the wedges 30 . Then, when inserting the set jig 40, the wedge body 30 is press-fitted by hitting with a hammer or the like from the upper portion of the connecting portion 43 (hitting portion) (Fig. 7D (l) (m)).

After the connecting tool 1 of the PC tendon T is used and the PC tendon T is hung between the reaction bodies 70, the jack 80 is used from the side of the reaction body 70 on the tension side to connect the PC tendon T. Tension is introduced and the PC tendon T is tensioned.
After the tension is introduced into the PC tendon T, concrete is placed in the formwork 90, and when the concrete develops a predetermined strength, the formwork 90 is demolded and the tension is released.

9A (a) to (d), FIG. 9B (e) to (h), and FIG. After the tendon T is cut at the outside of one end side and the other end side of the housing portion 10, the setting jig 40 is removed from the opening portion 12 (FIG. 9A(c)).

Next, the wedge 30 is tightly fitted to the tapered portion 23b, and it is difficult to remove the wedge 30 from the tapered portion 23b. A striking force is applied to the end of T with a hammer or the like (FIGS. 9A(d) to 9B(g)). The wedge body 30 on the other end side to which the other PC tendon T is fitted is removed from the tapered portion 23b.

Next, since the blade portion 32 of the wedge body 30 is engaged with the PC tendon T, the wedge body 30 is dismantled into three divided bodies 30a, 30b, and 30c by removing the wedge body connection O-ring 34. Then, it is removed from the other PC tendon T and removed from the opening 12 as three divided bodies 31a, 31b, 31c. Next, the other PC tendon T is pulled out from the PC tendon insertion opening 22 on the other end side.
After that, a striking force is applied to the end of one of the PC tendons T cut on the outside of the one end side, and the wedge body 30 on the one end side fitted with one of the PC tendons T is separated from the tapered portion 23b. It is removed (FIGS. 9B(h) to 9C(l)).

Next, the wedge body 30 is dismantled into three divided bodies 30a, 30b, and 30c by removing the wedge body connection O-ring 34, and then removed from one of the PC tendons T to form three divided bodies 31a and 31b. , 31c from the opening 12. As shown in FIG. Next, one PC tendon T is pulled out from the PC tendon insertion opening 22 on the one end side.
Then, the housing portion 10, the wedge holder portion 20, the wedge 30, the set jig 40, and the like, which constitute the connection tool 1 of the PC tendon T, are cleaned by removing dirt and the like, and oil is applied.

<Another embodiment of the connector 1 of the PC tendon T>
Next, a second embodiment of the connector 1 for the PC tendon T will be described with reference to FIGS. 10 to 13. FIG. This embodiment shows an example in which a casing 10 constituting a connector 101 of a PC tendon has a wedge holder 20 at one end and a threaded holder 120 at the other end.
In the following description, the same reference numerals are given to the same contents as in the above-described embodiment, and the description thereof will be omitted.

As shown in FIG. 10, the PC tendon connector 101 is mainly composed of a housing portion 10, a wedge holder portion 20, a threaded holder portion 120, a wedge 30, a set jig 40, and the like. and
As shown in FIGS. 10 and 11, the threaded holder portion 120 is installed at the opposite end (the other end) of the wedge body holder portion 20 formed at one end of the housing portion 10 . It is screwed to the portion 113 . The screwing holder portion 120 is attached integrally with the housing portion 10, and unlike the above-described embodiment, it is configured to fix a threaded reinforcing bar or the like that is threaded to the outer peripheral surface of the reinforcing bar material. be.

More specifically, the threaded reinforcing bar insertion hole 121 , the male screw portion 24 , and the knob portion 25 are formed in the screwing holder portion 120 . Threaded reinforcing bar insertion holes 122 are formed at both end portions of the screwing holder portion 120, and the threaded reinforcing bar insertion holes 121 penetrate the screwing holder portion 120 in the longitudinal direction. The size of the threaded reinforcing bar insertion hole 121 is formed according to the thickness of the threaded reinforcing bar material 100T.

The threaded reinforcing bar insertion hole 121 is a portion into which the threaded reinforcing bar material 100T is screwed. The size of the female threaded portion 121a is formed to match the male threaded portion 100Ta of the threaded reinforcing bar material 100T.
Then, as shown in FIG. 11 , the male threaded portion 100Ta of the threaded reinforcing bar material 100T is screwed into the female threaded portion 121a of the threaded holder portion 120 .

As shown in FIG. 12, one end side of the set jig 40 is formed with the wedge pressing portion 42, and the pressing portion 42a formed at the other end side is in contact with the end portion of the threaded reinforcing bar material 100T. It is a surface that is formed to allow Then, the pressing portion 42a of the set jig 40 on the side of the threaded reinforcing bar 100T comes into contact with the end of the threaded reinforcing bar 100T.
Since the threaded reinforcing bar 100T is screwed into the screwing holder portion 120, even if the setting jig 40 is attached, the longitudinal position of the threaded reinforcing bar 100T does not change. The threaded reinforcing bar material 100T and the pressing portion 42a on the other end side serve as contact surfaces for press fitting the wedge body 30 on the one end side.

Further, the tapered portion 42b on the threaded reinforcing bar material 100T side is a surface formed to facilitate the attachment of the pressing portion 42a to the position of the contact surface described above.

Further, the connecting portion 43 (hit portion) is used when the set jig 40 is attached by impact from above, and the pressing portion 42a is attached to the position of the abutment surface described above.

Next, as shown in FIG. 13, the method of using the connector 101 of the threaded reinforcing bar material 100T is as follows. At a position near the reaction body 70 on the outside of the formwork 90 for manufacturing the PC member closest to the provided as 101.
The threaded reinforcing bar material 100T is connected to the threaded holder portion 120 on the reaction body 70 side of the connecting tool 101 of the threaded reinforcing bar material 100T, and the wedge body holder part 20 on the form 90 side of the connecting tool 101 of the threaded reinforcing bar material 100T. A PC tendon T is connected to the . The threaded reinforcing bar material 100T and the PC tendon T are connected in the axial direction.

The threaded reinforcing bar material 100T can be a threaded reinforcing bar, a high-tensile deformed reinforcing bar (threaded reinforcing bar), or the like.

As shown in FIG. 13, the threaded reinforcing bar material 100T and the reaction body 70 are fixed outside the reaction body 70 using a fixing nut 70a and a fixing plate 70b corresponding to the thickness of the threaded reinforcing bar material 100T. Fixed.

The fixing of the screw reinforcing bar material 100T and the reaction force body 70 is not limited to the fixing method using the fixing nut 70a and the fixing plate 70b. , an appropriate fixing method is possible.

Next, assembly of the connector 101 of the threaded reinforcing bar material 100T will be described.
A connector 101 of the threaded rebar material 100T is provided between the reaction body 70 and the formwork 90 closest to the reaction body 70 . The threaded reinforcing bar material 100T is connected to the reaction body 70 side of the connector 101 of the threaded reinforcing bar material 100T, and the PC tendon T is connected to the formwork 90 side of the connecting tool 101 of the threaded reinforcing bar material 100T.

First, the threaded reinforcing bar material 100T is rotated and inserted from the threaded reinforcing bar insertion hole 122 on the end side of the housing part 10 and is screwed into the female threaded portion 121a of the threaded reinforcing bar insertion hole 121 .

Next, the set jig 40 is arranged from the opening 12 to the hollow portion 11 . At this time, the tapered portion 42b on the end side enters before the pressing portion 42a, and the pressing portion 42a on the end side serves as a contact surface for press-fitting the wedge body 30 on the opposite end side. Become.

The connecting portion 43 (hitting portion) of the setting jig 40 is used when the setting jig 40 is mounted by hitting from above and the pressing portion 42a is mounted on the position of the abutting surface.

The threaded reinforcing bar 100T and the reaction body 70 are fixed outside the reaction body 70 using a fixing nut 70a and a fixing plate 70b corresponding to the thickness of the threaded reinforcing bar 100T. Then, using the jack 80 from the side of the reaction force 70 on the tension side, tension is introduced into the threaded reinforcing bar material 100T and the PC tendon T, and the threaded reinforcing bar material 100T and the PC tendon T are tensioned.

Next, a method for removing the connector 101 of the threaded reinforcing bar material 100T will be described.
First, the PC tendon T is cut outside one end of the housing 10 and the set jig 40 is removed from the opening 12 .
After that, the fixing nut 70a and the fixing plate 70b of the screw reinforcing bar material 100T arranged outside the reaction force body 70 are removed.

After that, the threaded reinforcing bar material 100T screwed to the threaded holder portion 120 of the housing portion 10 is rotated and removed from the threaded holder portion 120 .
Then, the threaded reinforcing bar material 100T is pulled out to the outside of the reaction body 70 through the through-hole 70c of the threaded reinforcing bar material 100T formed substantially in the center of the reaction body 70 in the height direction.

<Other embodiments>
In the above embodiment, the casing 10 has a cylindrical shape, but the shape of the casing 10 is not limited to a cylindrical shape, and may be any shape such as a prismatic shape.

Further, in the above embodiment, a case where a high-strength reinforcing bar having a specific diameter is used as the PC tendon T is described, but it is also possible to select it according to the outer diameter of the housing part 10 according to the diameter. It is possible.

In the above embodiment, the opening 12 has a substantially rectangular shape, but the shape of the opening 12 is not limited to a substantially rectangular shape. As long as the body 30 and the PC tendon T can be visually engaged, any shape such as a substantially elliptical shape is possible.

In the above embodiment, the wedge holder portion 20 and the housing portion 10 are screwed together. Instead, fitting means or other suitable joining structures are possible.

Further, in the above embodiment, the case where the wedge body 30 is composed of three divided bodies 30a, 30b, and 30c has been described, but the wedge body 30 is not limited to this. It is possible for the wedge body 30 to be composed of a plurality of divided bodies.

Further, in the above embodiment, the case where the connecting portion 43 (hitting portion) of the setting jig 40 has a substantially rectangular parallelepiped shape has been described. It is possible to

Further, in the above embodiment, the use of high-strength reinforcing bars as the PC tendons T has been described. It is possible to use an appropriate PC tendon T such as.

1 Connecting tool 10 Housing part 11 Hollow part 12 Opening part 13 Wedge holder installation part 13b Female screw part 20 Wedge holder part 21 PC tendon insertion hole 22 PC tendon insertion hole 23 Wedge mounting hole 23a Wedge fitting opening 23b Tapered portion 24 Male screw portion 25 Knob portion 30 Wedge body 30a 30b 30c Divided body 32 Cutting edge portion 33 PC tendon through hole 34 O-ring 35 O-ring fixing groove 36 Gap 40 Setting jig 41 Horseshoe-shaped space 42 Wedge pressing portion 42a pressing portion 42b tapered portion 43 connecting portion (hitting portion)
50 wedge body mounting base 50a wedge body fitting groove 50b setting jig installation surface 60 casing overturn prevention part 70 reaction force body 70a fixing nut 70b fixing plate 70c through hole 80 jack 90 formwork 100T threaded reinforcing bar material 100Ta male screw part 101 connection tool 113 threaded holder installation portion 120 threaded holder portion 121 threaded reinforcing bar insertion hole 121a female threaded portion 122 threaded reinforcing bar insertion hole TPC tendon

Claims (6)

A PC tendon connector for connecting PC tendons, comprising:
The connecting device includes a housing portion having a hollow portion that constitutes a main body, a wedge holder portion that holds a wedge body on at least one of one end side and the other end side of the housing portion, and the wedge body. It is composed of the wedge body arranged in the holder part and holding the PC tendon, and a set jig for pressing the wedge body,
The housing portion includes the hollow portion communicating with the wedge holder portion, an opening formed in a part of the hollow portion and open to the atmosphere, and a wedge holder for mounting the wedge holder portion. and
The set jig includes a pressing portion formed on at least one end side of both ends, an arrangement portion in which the PC tendon can be placed in the pressing portion, and a connecting portion connecting the pressing portions. ,
When the setting jig is arranged from the opening of the housing portion, the PC tendon is positioned and mounted on the arrangement portion of the setting jig, and the wedge body is pressed by the pressing portion of the setting jig. A connector for a PC tendon, wherein the PC tendon is capable of being pressed against the wedge holder portion while holding the PC tendon. 2. The connector of the PC tendon according to claim 1, wherein the PC tendon is arranged in a state in which the axial directions of the one end side and the other end side of the housing part are aligned with each other. . The wedge holder portion includes a PC tendon insertion hole provided on one end side of the wedge holder portion, a wedge mounting hole provided on the other end side of the wedge holder portion, and the PC tendon insertion hole. 3. A connector for a PC tendon according to claim 1 or 2, comprising a knob portion formed on the hole side, and a male screw portion formed on the outer peripheral portion continuously with the knob portion. . The wedge body includes a plurality of divided bodies divided in a circumferential direction, a blade-shaped portion formed on the inner surface of the divided bodies, and a PC tendon through which the PC tendon formed by the plurality of divided bodies is inserted. 4. The connector for PC tendons according to claim 1, further comprising a through hole and a wedge connector for integrating the divided bodies. 5. The connecting tool for a PC tendon according to claim 1, wherein the pressing part of the setting jig is provided with an arrangement part for arranging the PC tendon. 6. A connection tool for a PC tendon according to claim 5, wherein a free end side of the pressing portion is tapered toward the connecting portion from a wedge pressing surface.

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