JP2007216503A - Connector, method and apparatus for producing pc member - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a connector which can improve working efficiency in the production of a PC member and reduce the loss of steel for PC produced in the production of the PC member and an apparatus for producing the PC member. <P>SOLUTION: The apparatus 10 for producing the PC member has at least a tension side abutment 4 introducing tension into a PC steel wire 2, a reaction force receiving side abutment 5 receiving reaction force when the tension is introduced, a prescribed number of PC steel bars 3, 3, etc., fixed to both abutments 4 and 5, and the connectors 1, 1, etc., each connected to one end of each of the PC steel bars 3, 3, etc. One end of the steel bar 3 is screwed/connected into/to the concave groove of the connector 1. Both ends of the PC steel wire 2 are engaged with the holes 16d of both hole-formed fitting tools (wedges 16) of the connector 1 of the reaction force receiving side abutment 5 and the connector 1 of the tension side abutment 4 corresponding to the connector 1, respectively. A prescribed number of the PC steel wires 2, 2, etc., are suspended between the abutments 4 and 5. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a connecting tool for connecting two PC steel materials, and a PC member manufacturing apparatus and manufacturing method including the connecting tool, and in particular, to improve work efficiency when manufacturing a PC member. The present invention relates to a connector, a PC member manufacturing apparatus, and a manufacturing method that can reduce the loss of steel for PC that can be generated during the manufacturing of the PC member.

  Generally, a prestressed concrete member (hereinafter referred to as a PC member) whose strength against tensile force and cracking is increased by applying a tension force (compression force) to concrete that is weak to tensile force in advance or after the concrete is cured. ) Is frequently used in the construction field. This prestress is introduced to concrete as prestress through the adhesion between PC steel and concrete such as PC steel wire, PC steel strand, and PC steel bar. It is. As a prestress introduction method, a tension force is introduced into the PC steel material in advance and the tension force is released after the concrete is hardened, and after the concrete is hardened, the concrete is put into the concrete (through a sheath tube or the like). ) There is a post-tension system that introduces tension to the embedded steel for PC.

  By the way, when manufacturing a PC member by the above-mentioned pretension method, a tension side abut provided with a tension jack and a reaction force receiving side abut against the tension force are arranged to face each other with a predetermined interval therebetween. A mold for producing a PC member is installed, and both ends of the PC steel material penetrating through the side wall of the mold are fixed to a tension side abut (its tension jack) and a reaction force receiving side abut. Before placing fresh concrete in the formwork, a tension force is introduced to the steel for PC with a jack, the concrete is placed, and after waiting for its hardening, the tension is released. A predetermined pre-stress is introduced into the system. Note that the PC member is a long member such as a bridge girder. When prestress is introduced in one direction, a pair of abut units including a tension side abutment and a reaction force receiving side abutment are prepared. That's fine. On the other hand, when a prestress is introduced in two directions, such as a slab, which has a planar spread, for example, two sets of the abut unit described above are prepared and a PC member is manufactured.

Patent Document 1 can be cited as a technique related to a conventional PC member manufacturing method using a pretension method. This technique is a method of manufacturing a PC member provided with a tension member that intersects in two directions (X direction and Y direction). For example, a deviator is attached to the end of the tension member in the Y direction, and the tension force Is introduced into both tendons, and after the concrete has hardened, the jacks of the tendons in the X direction are first loosened, and then the jacks in the Y direction are loosened. When the deviator is not attached, there is a problem that when the tension material in the X direction is loosened, the tension material in the Y direction is forcibly bent in the vicinity of the fixing portion of the concrete member. This bending can be prevented by attaching a deviator to the tension material on the side to be loosened later.
JP 2005-47233 A

  According to the manufacturing method of the PC member by the pretension method disclosed in Patent Document 1, among the tension members intersecting in two directions, without causing the other tension material to bend when the tension force of one tension material is relaxed, Tension can be relaxed from both tendons. However, both ends of the tension material are fixed to both the tension abutment (jack) and the reaction force abutment, and the tension material for the length from the PC member to both abutments, that is, the tension finally removed. The amount of material loss increases. This problem is not limited to the above-mentioned Patent Document 1, but is a problem that inevitably occurs when a PC member is manufactured by a conventional pretension method.

  In addition, it takes a lot of time and labor to penetrate the tension material through the through hole for the tension material drilled in the abut, and this problem becomes more serious as the number of tension materials increases. It will also lead to an increase in manufacturing costs. Furthermore, by directly installing the tendon material on the abutment, the loss of the introduced tension force due to various errors during installation still remains.

  The present invention has been made in view of the above-described problems, and when manufacturing a PC member, it is possible to reduce the amount of loss of steel for PC, to reduce the loss of introduction tension, and furthermore, An object of the present invention is to provide a connecting device that can reduce the time and labor required for installing a steel material for PC on an abut, etc., and a manufacturing apparatus and a manufacturing method of a PC member including the connecting device. To do.

  In order to achieve the above object, the connector according to the present invention is a connector for connecting two PC steel materials, and the connector includes a first opening into which one PC steel material is inserted, A main body member provided with a hollow portion communicating with the first opening, a second opening into which the other PC steel material is inserted, and a concave groove communicating with the second opening, and provided in the hollow portion And the perforated locking tool attached to the biasing member, and the one steel material for PC can be press-fitted into the hole of the perforated locking tool. The other steel for PC can be attached to the groove.

  Here, the steel for PC includes an optional specification PC steel wire, PC steel rod, PC steel strand, bar steel made of mild steel or high tensile steel, carbon fiber reinforced plastic (CFRP) rod, etc. There are two PC steel wires, two PC steel bars, two high-tensile steels, two deformed steel bars (soft steel), and other PC steel wires and PC steel bars. Any combination of PC steel materials having different specifications, such as a combination of PC steel wire and high-tensile steel, a combination of PC steel bar and deformed bar steel (soft steel), can be applied.

  The main body member constituting the connector includes a form having a relatively long rod-like outer shape, and other arbitrary outer shape. The main body member is formed of any material having at least a tensile strength that can resist the introduction tension, such as a steel material and a high-strength plastic material. In addition to being applied as a coupler that connects two PC steel materials used as a tension material for a structure, the connector of the present invention is also applied to a PC member manufacturing apparatus described later.

  Two openings into which two steel materials for PC can be inserted are formed in the connection tool. One opening (first opening) communicates with a hollow portion formed inside the main body member, and the other opening (second opening) is a concave groove drilled to a predetermined depth inside the main body member. Communicated with. An urging member made of, for example, a compression spring is attached to the hollow portion, and a perforated locking tool having an arbitrary shape is attached to an end of the urging member.

  The hole formed in the perforated locking tool may be a through-hole penetrating from one end side to the other end side of the locking tool, or a hole having a shape drilled halfway inside the locking tool. May be. The inner diameter of the hole can be formed to be the same as the outer diameter of the end portion of the PC steel material to be inserted, or slightly smaller than the outer diameter of the PC steel material. However, when the end of the PC steel material is press-fitted and a tensile force is introduced into the PC steel material, the perforated locking tool and the PC steel material do not separate by the introduced tension force. Both inner and outer diameters are determined so that

  When the end of one of the PC steel materials is press-fitted into the hole of the perforated locking tool, the perforated locking tool compresses the biasing member against the biasing of the biasing member. When the pressing force is released after the PC steel material is fitted in the hole, the perforated locking tool is urged toward the first opening by the urging member, and one end thereof is in contact with the end of the hollow portion. By combining, one steel for PC is fixed to the connector.

  On the other hand, the other steel for PC is inserted into the groove from the second opening and fixed to the connector. As for the fixing between the steel for PC and the concave groove, an appropriate fixing mode such as a fitting structure, a screwing structure or the like can be selected, and as described above, at least a connection strength that can resist the introduction tension force is provided. A fixed mode is required.

  According to the connection tool of the present invention, it is possible to easily connect two steel materials for PC of arbitrary specifications, and it is possible to ensure sufficient strength of the connection portion.

  Further, in another embodiment of the connection tool according to the present invention, a part of the hollow portion includes a tapered portion that decreases in diameter toward the first opening, and the perforated locking tool includes: It is made of a wedge body that can be fitted to the taper portion, and an inner wall surface of the concave groove is formed with a thread that can be screwed with an end portion of the other PC steel material.

  The outer shape of the perforated locking tool is a wedge shape whose diameter is reduced from one side to the other side, and an inner wall-shaped taper portion corresponding to the wedge shape is formed in a part of the hollow portion to release the pressing force described above. In some cases, by allowing the perforated locking tool to be fitted to the tapered portion, it is possible to realize a strong engagement between the perforated locking tool and the main body member of the connecting tool. In addition, the wedge body is formed in a wedge shape as a whole, or formed in a wedge shape as a whole by bringing the ends of two or more divided bodies into contact with each other. There is a form in which two to three or more notches are formed in the enlarged diameter part of the body. In particular, when a wedge body is formed from a plurality of divided bodies, the wedge body is released from the tapered portion of the fitting state when one PC steel material is press-fitted into the hole of the wedge body. Thus, the divided bodies are separated from each other, and the diameter of the hole in the divided body is increased so that the steel for PC can be easily inserted into the hole. After the PC steel material is inserted into the hole, the pressing force is released, and the separated divided body is urged by the urging member, is fitted into the tapered portion as an integral wedge body, and is used for the PC at the inner wall of the hole. In a state where the steel material is compressed, the wedge body and the PC steel material are firmly connected.

  On the other hand, in the concave groove, a threaded portion that is screwed with the threaded portion at the end of the other PC steel material is formed, and the PC steel material is screwed and fixed in the concave groove so that the other PC steel material is connected. A simple connection between the steel material and the connection tool can be realized, and a strong connection strength can be obtained.

  A PC member manufacturing apparatus according to the present invention is a PC member manufacturing apparatus that manufactures a PC member including a first PC steel material to which prestress is introduced by a pretension method, and a tension side abut, Connected to one end of the second PC steel material and a predetermined number of second PC steel members fixed to both abutments, an abut unit comprising a reaction force receiving abutment that receives a reaction force when a tension force is introduced At least one end of the second PC steel material attached to the concave groove of the connection tool, and the connection tool of the reaction force receiving side abut, and the connection tool. Both ends of the first PC steel material are fitted into the holes of the perforated locking devices of the corresponding tension side abut connector, and a predetermined number of the first PC steel materials are placed between the abut units. Configured to be stretched I am characterized in.

  The PC member manufacturing apparatus of the present invention relates to an apparatus used when manufacturing a PC member by a pretension method, and as a steel material for PC embedded in concrete, a PC steel wire, a PC steel bar, PC steel strands are applied.

  The manufacturing apparatus includes a tension side abut provided with a tension jack and the like, and a reaction force receiving side abut placed at a predetermined interval from the abut and receiving a reaction force when the tension force is introduced. Furthermore, a PC steel material (second PC steel material) made up of a predetermined number of PC steel bars or the like is attached to both abutments in a form corresponding to the PC steel material (second PC steel material) of the other abutment. It has been. Among the PC steel materials, for example, a threaded portion is formed at an end portion on the other abut side, and an end portion of each PC steel material is formed into a concave groove of the connector (the inner wall is also threaded). The steel material for PC and the connection tool can be connected.

  A mold for manufacturing a PC member having a predetermined shape is provided between the fittings attached to both the abuts facing each other, and both abutments are inserted through through holes formed in the side frame of the mold. Both ends of a PC steel material (first PC steel material) made of a PC steel wire or the like are attached to the connector, and a predetermined number of PC steel materials are spanned between abutments.

  When attaching the end portion of the first PC steel material to the connecting tool, after pressing and fitting one end portion into the hole of the perforated locking tool of the connecting tool of one abutment, the connection of the other abutment The perforated locking tool of the tool and the other end of the first PC steel material are pressed and fitted in the same manner.

  A predetermined number of first PC steel materials are stretched between the abuts, and a PC steel material is stretched by introducing a predetermined tension force to each PC steel material, and fresh concrete is filled into the mold. Wait until the concrete develops the desired strength, then relax the jacking force and remove the end of each PC steel wire from the connector, so that PC members (PC girders, PC columns, etc.) of the desired shape and dimensions ) Can be manufactured.

  In addition, as a method of removing the end portion of the first PC steel material from the perforated locking tool, for example, an arbitrary-shaped removal jig is inserted from the first opening, and, for example, a wedge-shaped structure composed of a plurality of divided bodies is used. By pushing the perforated locking tool against the biasing member and separating the divided body within the hollow part to release the first PC steel material inside it, it is easily connected to the first PC steel material. It can be removed from the tool.

  According to the PC member manufacturing apparatus of the present invention, the connection tool is attached to both the tension side abutment and the reaction force receiving side abut via the second PC steel material, and the first PC use is installed in the PC member. By attaching both ends of the steel material to the opposing connector, the loss amount of the PC steel material (first PC steel material) can be significantly reduced.

  In addition, since the PC steel can be passed between the abutments simply by pressing the end of the PC steel into the hole of the perforated locking tool constituting the connecting tool, the arrangement work efficiency of the PC steel is conventionally improved. Compared with the above-mentioned apparatus, it can be remarkably increased. In addition, since the steel for PC can be firmly connected to the connector, it is possible to reliably prevent the loss of introduced tension due to the set loss of the end of the steel for PC (first PC steel) installed on the abutment. be able to.

  Further, another embodiment of the PC member manufacturing apparatus according to the present invention comprises two sets of abut units, and two sets such that the axes connecting both the tension side abutment and the reaction force receiving side abut intersect each other. This is characterized in that a PC member into which prestress is introduced in two intersecting directions can be manufactured.

  The manufacturing apparatus according to the present invention particularly relates to an apparatus applied when manufacturing a PC member having a wide area such as a slab. Here, the crossing mode of the two axes connecting the two sets of abut units includes a mode of crossing at an arbitrary crossing angle in addition to a mode of crossing perpendicularly. However, plate-like PC members such as squares, rectangles, rhombuses, parallelograms, and trapezoids can be manufactured.

  According to the apparatus for manufacturing a PC member of the present invention, in addition to the effects of the apparatus described above (reduction of loss of PC steel wire, etc., reduction of loss of introduction tension, etc.), an arbitrary shape having a wide area It is possible to efficiently manufacture the plate-like PC member.

  Further, the PC member manufacturing method according to the present invention is a PC member manufacturing method for manufacturing a PC member having a steel material for PC into which prestress is introduced by a pretension method, and the PC member manufacturing apparatus is prepared. And connecting both ends of the first PC steel material to the opposing connecting devices installed on both abuts, and spanning a predetermined number of first PC steel materials between the abuts, A second step of introducing tension to the steel for PC 1 and placing concrete in a mold installed between abut units, releasing the tension when the concrete exhibits a predetermined strength; And a third step of introducing prestress into the concrete.

  By using the PC member manufacturing apparatus of the present invention, as described above, it is not necessary to directly install the first PC steel material such as PC steel wire on the abut, and the end of the PC steel material is connected to the abutment. Since the installation of the PC steel material is completed simply by pressing against the hole of the perforated locking tool, the time required for the preparation until the PC steel material is stretched between the abutments (introducing the tension force) is reduced. It becomes possible to shorten it markedly compared with.

  As can be understood from the above description, according to the connecting device of the present invention and the PC member manufacturing apparatus and method including the connecting device, the loss amount of the end portion of the steel for PC installed in the PC member is reduced. It is possible to reduce the loss of the tensile force introduced into the steel for PC, and it is possible to efficiently stretch the steel for PC between the opposing abutments. Therefore, it is possible to shorten the manufacturing time of the PC member, leading to a reduction in manufacturing cost.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a longitudinal sectional view of an embodiment of the connector of the present invention, and FIG. 2 is a perspective view of a wedge body. FIG. 3 is a diagram illustrating a situation in which the PC steel wire is connected to the connector, and FIG. 3A is a diagram illustrating a situation in which the PC steel wire is pressed against the hole of the wedge body. 3b is a diagram showing a state in which the pressing force is released. 4 is a side view of an embodiment of the PC member manufacturing apparatus of the present invention, FIG. 5 is a view taken in the direction of the arrow V in FIG. 4, and is a plan view of the PC member manufacturing apparatus, FIG. The top view of other embodiment of the manufacturing apparatus of the PC member of this invention is shown, respectively. 7 to 12 are views for explaining a manufacturing method for manufacturing a PC member in order using the PC member manufacturing apparatus shown in FIGS. 4 and 5, and FIG. 13 shows the PC steel wire removed from the wedge body. FIG.

  FIG. 1 shows a longitudinal view of an embodiment of a connection tool. The connector 1 is made of a relatively long body member 11 made of steel, and two openings 12 and 14 are perforated at both ends of the body member 11. One opening 12 communicates with a hollow portion 13 formed inside the body member 11, and a portion of the hollow portion 13 on the opening 12 side is reduced in diameter toward the opening 12. A tapered portion 13a is formed.

  A compression spring 17 is attached in the hollow portion 13, one end of the compression spring 17 is attached to the back end portion of the hollow portion 13, and the other end of the compression spring 17 is formed in the through hole 16 d inside. The wedge body 16 is provided. The outer shape of the wedge body 16 matches the inner wall shape of the tapered portion 13a, and the wedge body 16 can be removed from the tapered portion 13a by pressing the compression spring 17 from the opening 12 side via the wedge body 16. ing.

  On the other hand, a concave groove 15 having a predetermined depth is formed from the other opening 14 of the main body member 11, and the inner wall surface of the concave groove 15 is threaded and screwed at the end of the PC steel material to be inserted. A mating thread 15a is formed.

  FIG. 2 shows a perspective view of the wedge body 16. The wedge body 16 is composed of three divided bodies 16a, 16b and 16c, and the wedge body 16 is formed by bringing the end faces of these divided bodies 16a, 16b and 16c into contact with each other. . A through hole 16d is formed inside the wedge body 16, and a PC steel material can be inserted into the through hole 16d. In addition, each division body which comprises the wedge body 16 has an inseparable structure at the reduced diameter end portion, and a configuration in which each division body can be separated at the enlarged diameter portion (a part of the wedge body includes a plurality of parts). It may be a separated form). Further, the hole diameter of the through hole 16d is determined in consideration of the outer diameter of the inserted PC steel material, the adhesion strength when the PC steel material is press-fitted into the through hole, the pressing strength, and the like.

  FIG. 3 is a diagram illustrating a situation where a PC steel wire is connected to the connection tool. In FIG. 3 a, the PC steel rod 3 (the threaded thread 3 a) is screwed into the concave groove 15 (the threaded thread 15 a) of the main body member 11 of the connector 1, and the PC steel wire 2 inserted from the opening 12 is inserted into the hollow portion 13. This shows a state in which the wedge body 16 is press-fitted into the through-hole 16d. By pressing and fitting the PC steel wire 2 (X direction), the wedge body 16 that is locked in the tapered portion 13 a while being urged by the compression spring 17 resists the urge of the compression spring 17. It is pushed into the hollow part 13. When the wedge body 16 is pushed into the hollow portion 13, the divided bodies 16 a, 16 b, and 16 c that are restrained by the tapered portion 13 a are separated, and the diameter of the through-hole 16 d is increased, whereby the PC steel wire 2 is predetermined. Only the length is inserted.

  FIG. 3b shows a situation in which the PC steel wire 2 is inserted and the pressing force is released. By releasing the pressing force, the wedge body 16 is urged toward the opening 12 by the compression spring 17 (Y direction), and the separated divided bodies 16a, 16b, and 16c become an integral wedge body 16 and taper. It is inserted into the part 13a. When the divided bodies 16a, 16b, and 16c are integrated, the PC steel wire 2 is firmly fitted in the through hole 16d, and the connection between the PC steel wire 2 and the connector 1 is completed. The connection tool 1 is screwed with the PC steel bar 3 on the one hand, and a connection structure between the PC steel bar 3 and the PC steel wire 2 via the connection tool 1 is formed. In addition, this connector 1 can also be used as a coupler which connects PC steel bars.

  4 and 5 show an embodiment of a PC member manufacturing apparatus to which the connector 1 described above is applied. FIG. 4 is a side view thereof, and FIG. 5 is a plan view thereof. Each is shown.

  The manufacturing apparatus 10 is an apparatus for manufacturing a girder of a long member in which a plurality of PC steel wires are installed in one direction and prestress is introduced. As shown in FIG. 5, the manufacturing apparatus 10 includes a tension-side abutment 4 having jacks 6, 6,... As many as the PC steel wires 2, 2,. The reaction force receiving side abutment 5 arranged at an interval of 2 and the girder construction form 7 installed between the two abutments. As shown in FIG. 4, the mold frame 7 includes a bottom frame 72 and a side frame 71, and the side frame 71 is provided with a PC steel wire through hole (not shown).

  Returning to FIG. 5, a predetermined number and the same number of PC steel bars 3, 3,... Are fixed to both abutments 4, 5, and one end of each of the PC steel bars 3, 3,. The above-mentioned connecting devices 1, 1,... Are attached. For example, as described above, threading is formed at the attachment end of the PC steel bar 3, and this end is screwed into the concave groove 15 of the connector 1.

  On the other hand, the end of the PC steel wire 2 is pressed into the other opening 12 of the connector 1 and is fitted and connected to the wedge body 16 in the main body member 11. Since both ends are respectively attached to the connecting devices 1 and 1 of both abutments 4 and 5, the PC steel wire 2 is stretched between both abutments 4 and 5 (between opposing side frames 71 and 71).

  After the predetermined number of PC steel wires 2, 2,... Are spanned between the abutments 4, 5, the PC steel rods 3, 3,. A tension force is introduced into 2, 2,..., And a PC steel wire is stretched between the abutments.

  On the other hand, FIG. 6 is a plan view showing a manufacturing apparatus 10A used when forming a flat plate into which prestress is introduced in two directions.

  The tension side abutment 4 is provided with two jacks 6a and 6a, and the tension side beam member 4a is attached to the jacks 6a and 6a. A predetermined number of PC steel bars 3, 3,... Are fixed to the tension side beam member 4a, and the connecting tools 1a, 1a,. It is connected. On the other hand, PC steel rods 3, 3,... Are similarly fixed to the reaction force receiving side abut 5, and the connecting tools 1a, 1a,. The PC steel wire 2a in the longitudinal direction is stretched between the corresponding connecting tools 1a and 1a.

  On the other hand, also in the short side direction, a predetermined number of PC steel bars 3, 3,... Are attached to both the tension side abut 4 and the reaction force receiving side abut 5, and the connectors 1b, 1b,. The PC steel wire 2b in the short direction is stretched between the corresponding connectors 1b and 1b. The tension jack in the short direction is not shown.

  By introducing tension in the PC steel wires 2a, 2a, ..., 2b, 2b, ... in both the longitudinal direction and the short direction, the PC steel wires can be stretched in two directions. In the illustrated embodiment, a plurality of plate-like PC members A, A,... Are manufactured simultaneously in the longitudinal direction.

  In the embodiment of the PC member shown in the figure, the PC steel wires in two directions installed in the flat plate are perpendicular to each other, but the intersecting aspect of the PC steel wires can be selected at any angle other than orthogonal. In addition, it is possible to manufacture a PC member having an arbitrary shape such as a rhombus, a parallelogram, or a trapezoid in plan view.

  According to the manufacturing apparatuses 10 and 10A described above, since it is not necessary to directly fix the PC steel wire constituting the PC member to the opposing abutments 4 and 5, the loss amount of the PC steel wire to be finally cut is reduced. It can be greatly reduced. Moreover, since the PC steel wire is firmly connected to the connection tool, the loss of the introduction tension can be remarkably reduced as compared with the conventional manufacturing apparatus.

  Next, the manufacturing method of the PC member which uses the manufacturing apparatus 10 mentioned above based on FIGS. 7-12 is demonstrated.

  First, as shown in FIG. 7, a manufacturing apparatus 10 is prepared. Specifically, the tension side abutment 4 and the reaction force receiving side abutment 5 are arranged at a predetermined interval, and a predetermined number of PC steel bars 3, 3,. .. Are connected to the steel rods 3, 3,. Further, between both abutments 4 and 5, a mold 7 composed of a side frame 71 and a bottom frame 72 in which holes for penetrating PC steel wire are formed is installed.

  Next, as shown in FIG. 8, one end of the PC steel wire 2 is press-fitted to the connector 1 attached to the PC steel rod 3 of the reaction force receiving side abut 5, and the PC steel wire 2 is attached to the side frame 71. Through the hole, the other end of the PC steel wire 2 is passed through the through hole of the side frame 71 (X direction), and the connecting tool is connected through the opening 12 of the connecting tool 1 attached to the PC steel rod 3 of the tension side abut 4. 1 to press fit.

  Next, as shown in FIG. 9, the PC steel rod 3 is tensioned with a predetermined tension by the jack 6 (Y direction), and the PC steel wire 2 is stretched.

  After a predetermined tension is introduced into all the PC steel wires 2, as shown in FIG. 10, fresh concrete 9 is placed in the mold 7 and a predetermined strength is awaited.

  When the concrete exhibits a predetermined strength, as shown in FIG. 11, the side frame is removed from the mold, and the tension of the PC steel bar 3 and the PC steel wire 2 is released (Z direction). Is introduced.

  After the prestress is introduced, as shown in FIG. 12, both ends of the PC steel wire 2 are removed from the connecting devices 1 and 1, and the PC member A into which the prestress is introduced is removed from the bottom frame 72 (W direction). Production of A is completed. When removing the PC steel wire 2 from the connector 1, as shown in FIG. 13, an appropriate removal jig a is inserted into the opening 12 (X direction) and the wedge body 16 is pushed into the wedge. By releasing the meshing between the body 16 and the PC steel wire 2, the PC steel wire 2 can be easily removed (Y direction).

  According to the manufacturing method of the PC member using the manufacturing apparatus 10 of the present invention, the PC steel wire can be attached to the connector simply by pressing and inserting the PC steel wire installed in the PC member into the opening of the connector. Therefore, the working efficiency when the PC steel wire is passed between the abuts is remarkably improved. By improving the working efficiency, the manufacturing time of the PC member can be greatly shortened, and the manufacturing cost can be reduced.

  The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and there are design changes and the like without departing from the gist of the present invention. They are also included in the present invention.

The longitudinal section of one embodiment of the connecting tool of the present invention. The perspective view of a wedge body. It is the figure explaining the condition which has connected the PC steel wire to the connecting tool, (a) is the figure which showed the condition which is pressing the PC steel wire into the hole of a wedge body, (b) The figure which showed the state which released the pressing force. The side view of one Embodiment of the manufacturing apparatus of PC member of this invention. FIG. 5 is a plan view of the PC member manufacturing apparatus, as seen from the direction of arrow V in FIG. 4. The top view of other embodiment of the manufacturing apparatus of the PC member of this invention. The figure explaining the manufacturing method which manufactures a PC member using the manufacturing apparatus of PC member shown in FIG. The figure explaining the manufacturing method following FIG. The figure explaining the manufacturing method following FIG. The figure explaining the manufacturing method following FIG. The figure explaining the manufacturing method following FIG. The figure explaining the manufacturing method following FIG. The figure explaining the situation which has removed PC steel wire from a wedge.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1,1a, 1b ... Connector, 11 ... Main body member, 12 ... Opening, 13 ... Hollow part, 13a ... Tapered part, 14 ... Opening, 15 ... Ditch, 15a ... Threading, 16 ... Wedge body (perforated locking) 16a, 16b, 16c ... divided body, 16d ... through hole, 17 ... compression spring (biasing member), 2, 2a, 2b ... PC steel wire, 3 ... PC steel rod, 3a ... threading, 4 ... tension Side abutment, 4a ... tension side beam member, 5 ... reaction force receiving side abutment, 6, 6a ... jack, 7 ... formwork, 8 ... PC member, 9 ... concrete, 10, 10A ... manufacturing equipment, A ... PC member

Claims (5)

A connecting tool for connecting two steel for PC,
The connector includes a first opening into which one PC steel material is inserted, a hollow portion communicating with the first opening, a second opening into which the other PC steel material is inserted, and the second A concave member communicating with the opening of the body, a biasing member provided in the hollow portion, and a perforated locking tool attached to the biasing member, One of the PC steel materials can be press-fitted into the hole of the perforated locking tool, and the other PC steel material can be attached to the concave groove.   A part of the hollow portion includes a tapered portion that decreases in diameter toward the first opening, and the perforated locking tool is formed of a wedge body that can be fitted to the tapered portion, and the concave portion 2. The connector according to claim 1, wherein an inner wall surface of the groove is formed with a thread that can be screwed with an end portion of the other PC steel material. A PC member manufacturing apparatus for manufacturing a PC member including a first steel for PC to which prestress is introduced by a pretension method,
An abut unit comprising a tension side abutment, a reaction force receiving side abutment that receives a reaction force when a tension force is introduced, a predetermined number of second PC steel members fixed to both abutments, and a second PC use 3. The connection tool according to claim 1, wherein one end of the steel material is connected, and one end of the second PC steel material is attached to the concave groove of the connection tool. Both ends of the first steel for PC are fitted into the holes of the perforated locking devices of both the connecting device of the receiving side abutment and the connecting device of the tension side abutment corresponding to the connecting device, respectively. A PC member manufacturing apparatus configured such that the first steel for PC is stretched between abut units.   It consists of two sets of abut units, and two sets of abut units are arranged so that the axes connecting both the tension side abutment and the reaction force receiving side abut cross each other, and prestress is applied in the two intersecting directions. The PC member manufacturing apparatus according to claim 3, wherein the PC member to be introduced can be manufactured. A PC member manufacturing method for manufacturing a PC member provided with a steel material for PC into which prestress is introduced by a pretension method,
The first step of preparing the PC member manufacturing apparatus according to claim 3 or 4, and connecting both ends of the first steel for PC to the opposing connecting members installed on both abuts, A second step of transferring a predetermined number of first PC steel materials to the first PC steel material and introducing tension into the first PC steel material, and placing concrete in a mold placed between the abut units, And a third step of releasing pretension in the stage where a predetermined strength is developed and introducing prestress into the concrete.

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