JP6392691B2 - Rotation restraint structure of tendon joint and tendon joint - Google Patents

Description

  The present invention relates to a rotation restraint structure and a twist back for a tension member connecting device that prevents the tension member connecting member from rotating about its axis by the untwisting action of the steel strand when the steel strand is used as the tension member. The present invention relates to a tension member connector capable of preventing rotation by action.

  Steel strands are widely used as tendons. When steel ends are fixed to structural members, etc. by introducing tension, the ends of the steel strands are generally fixed to the steel block or steel sleeve using a wedge, and the steel strand or steel sleeve is constructed from the steel block or steel sleeve. It fixes so that tension may be transmitted to a member. Further, when connecting steel strands, as described in Patent Document 1 or Patent Document 2, the ends of the tension members are fixed to a steel block or a steel sleeve, and these steel blocks or steel sleeves are joined to each other. To do. A structure in which a steel block or a steel sleeve to which a tension material is fixed is connected to each other is often formed by forming a male screw or a female screw on both sides and twisting and joining rod-like or cylindrical joining members to these. .

JP 7-127691 A JP 2001-173157 A

  The steel stranded wire is obtained by bundling a plurality of steel wires to give a twist, and when a tensile force is introduced, a so-called untwisting action occurs in which the twist is twisted in a relaxed direction. At the fixing end when the tension force is introduced, the fixing tool is strongly pressed against the structural member or the like by the tension force introduced into the steel strand. Therefore, the twisting force due to the untwisting action can be easily restrained at both ends. However, a force that rotates around the axis of the stranded wire acts on the connector, which may cause inconvenience as described below.

  The tension members connected to each other are different, and as shown in FIG. 16 (a), a first tension member 101 that is a bundle of a plurality of steel wires or a plurality of steel strands, When the second tendon material 102, which is a stranded steel wire, is connected, a twisting back action occurs in the second tendon material 102 due to the introduction of the tensile force. Thereby, the connection tool 103 rotates around the axis line of the tendon members 101 and 102, and the first tendon member 101 bundled with a plurality of steel wires or a plurality of steel wires is twisted. In particular, when a part of the first tendon material 101 is already fixed by grout or the like, the twist due to the untwisting action of the second tendon material 102 is concentrated in a short range of the first tendon material 101.

  In addition, as described in Patent Document 1 or Patent Document 2, as a connection tool, steel blocks or steel sleeves 104 and 105 coupled to the first tension material 101 and the second tension material 102, respectively, When a joining member 106 that is twisted together with both of these is used, the steel blocks or steel sleeves 104 and 105 that are joined together may rotate relatively. That is, the steel sleeve 105 rotates about the axis by the untwisting action of the second tendon material 102 and the steel sleeve 105 and the joining member 106 are twisted together, or the steel sleeve 104 and the joining member 106 are twisted together. Rotate the part that has been loosened.

  On the other hand, as shown in FIG. 16 (b), a steel block to which the first tendon 111 is fixed or when the twisting action occurs in both the first tendon 111 and the second tendon 112. The steel sleeve 114 and the steel block or the steel sleeve 115 to which the second tendon is fixed tend to rotate in the opposite direction. When a force that causes relative rotation acts on the steel blocks or steel sleeves 114 and 115 joined to each other in this manner, there is a possibility that the joining member 116 that has been twisted will come out.

  This invention is made | formed in view of the above situations, and it aims at preventing that the whole or one part of a tension | tensile_strength connection tool rotates around an axis line by the twisting-back effect | action of a strand from steel. .

  In order to solve the above-mentioned problem, the invention according to claim 1 is directed to a tension material connector for connecting a first tension material and a second tension material made of a steel stranded wire around the axis of the second tension material. It is a rotation restraint structure of the tension member connecting device that restrains the rotation of the tension member, and the tension member connecting member has an end coupling member coupled to an end portion of the second tension member, and the end portion The second tendon is connected to the first tendon via a coupling member, and a first engagement member is fixed to the end coupling member, and the first tendon and the first tendon A second engagement member is fixed to a fixing member that is located around the connection portion with the second tension member and has not been moved, and the first engagement member and the second engagement member are , Allowing relative movement in the axial direction of the second tendon, and allowing the end coupling member to rotate around the axis of the second tendon. Provided is a rotation restraint structure for a tension member connecting device that is in contact with each other and restrains the rotation of the end coupling member when they are to rotate in a straight line.

In this rotational restraint structure of the tension member connecting device, when a tension force is introduced into the connected first and second tension members, the tension members are stretched, and the tension member connecting device moves in the axial direction. try to. At this time, since the first engagement member and the second engagement member allow relative movement in the axial direction, the first engagement member is fixed to the end coupling member and moved in the axial direction. Is not restrained by the second engaging member fixed to the fixing member, and the tension member connecting member moves in the axial direction. Thereby, a predetermined tension force is introduced into the first tension material and the second tension material.
On the other hand, a force to rotate around the axis of the second tendon acts on the end coupling member by the untwisting action of the second tendon, but the second engaging member fixed to the fixing member and The first engaging member fixed to the end coupling member comes into contact with the first coupling member, and the rotation of the end coupling member around the axis is restricted.

  The invention according to claim 2 is the rotation restraint structure of the tension member connector according to claim 1, wherein the first engaging member fixed to the end coupling member is around the second tension member. And a projecting member projecting in the axial direction of the second tendon, and the second engaging member is on a movement path when the projecting member rotates around the axis of the second tendon. It shall be in contact with the protruding member that is in position and intends to rotate.

In the rotation restraint structure of the tendon connection tool, the protruding member protrudes from the end coupling member in the axial direction of the second tendon, and the rotation of the projecting member is restrained by the second engaging member. Therefore, the first engaging member including the projecting member can be accommodated in a cylindrical region having a small radius from the central axis of the second tension member. Therefore, it becomes possible to arrange | position the tension material and the tension material connection tool with which rotation around an axis line is restrained in a small space.
In the present invention, the second engaging member may protrude from the position facing the first engaging member in the axial direction of the second tension member, or the second tension member from the side. What protruded toward the material may be sufficient.

  According to a third aspect of the present invention, in the rotation restraint structure of the tension member connecting device according to the first aspect, any one of the first engagement member and the second engagement member is opposed to each other. And the other of the first engaging member and the second engaging member is formed in the axial direction of the second tendon material, and the convex portion is inserted. It shall have a groove to be formed.

  In the rotation restraint structure of the tendon connection tool, when the tendon connection tool is about to move in the axial direction by the introduction of the tension force, the convex portion moves in the groove in the axial direction. Allow movement in direction. And with respect to the force of the rotational direction by a twisting-back effect | action, a convex-shaped part contacts the side surface of a groove | channel and rotation of an edge part coupling member is restrained.

  The invention which concerns on Claim 4 is the tension | tensile_strength which restrains that the tension | tensile_strength connecting tool which connects the 2nd tension | tensile_strength consisting of a 1st tension | tensile_strength and a steel strand wire rotates around the axis line of this 2nd tension | tensile_strength. It is a rotation restraint structure of a material connector, The said tension material connector has an edge part coupling member couple | bonded with the edge part of a said 2nd tension material, Said 2nd via this edge part coupling member The tension member is connected to the first tension material, and the fixing member and the end which are located around the connecting portion between the first tension material and the second tension material are fixed. An engagement member is fixed to one of the part coupling members, and the engagement member is relative to the other of the fixing member and the end coupling member in the axial direction of the second tendon. And when the end coupling member is about to rotate about the axis of the second tendon Providing rotation restraint structure of the tendon connectors is to contact to restrain the rotation of the end portion connecting member.

  In this rotational restraint structure of the tendon connection tool, when the tension force is introduced to the connected first tendon and the second tendon, the movement of the tendon connection tool in the axial direction may be restrained. Instead, a predetermined tension force can be introduced into the first tension material and the second tension material. In addition, even when a force to rotate around the axis acts on the end coupling member due to the unwinding action of the second tendon, the end coupling is caused by the engagement member contacting the end coupling member or the fixing member. The rotation of the member is constrained.

  The invention according to claim 5 is the rotation restraint structure of the tension member connector according to claim 4, wherein the engagement member fixed to one of the fixing member and the end coupling member is the first member. A rod-shaped body protruding in the axial direction of the second tendon around the second tendon, and the other of the fixing member and the end coupling member is formed in the axial direction of the second tendon And a hole into which the rod-like body is inserted.

  In the rotation restraint structure of the tension member connecting tool, when a tension force is introduced into the first tension material and the second tension material, the rod-like body that is thrust into the hole is further thrust into the hole, or The length according to the amount of tension material stretched out. Therefore, the movement in the axial direction of the end coupling member included in the tendon connection member is allowed. Further, the rotation of the end coupling member due to the untwisting action of the tendon is restrained by the rod-shaped body coming into contact with the inner peripheral surface of the hole.

  The invention according to claim 6 is the rotation restraint structure of the tension member connector according to claim 4, wherein the engagement member fixed to one of the fixing member and the end coupling member is the fixed member. A convex portion is formed at a portion where the member and the end portion coupling member face each other, and the other of the fixing member and the end portion coupling member is formed in the axial direction of the second tension member and is convex. It shall have a groove into which the part is inserted.

  In the rotation restraint structure of the tendon connection tool, when the tendon connection tool is about to move in the axial direction by the introduction of the tension force, the convex portion moves in the groove in the axial direction. Allow movement in direction. And with respect to the force of the rotational direction by a twisting-back effect | action, a convex-shaped part contacts the side surface of a groove | channel and rotation of an edge part coupling member is restrained.

  The invention according to claim 7 is the rotation restraint structure of the tension member connecting device according to any one of claims 1 to 6, wherein the fixing member is the first tension material or the second tension material. It is assumed that the concrete member is prestressed by the tension force.

  In the rotation restraint structure of the tension member connecting device, the fixing member is easily formed at a position close to the tension member connecting device by placing the concrete with the tension member and the tension member connecting member covered with a sheath or the like. be able to.

  The invention according to claim 8 is a tension material connector that connects the first tension material and the second tension material, at least one of which is a steel strand, to each other. When the force of the direction which rotates around the axis line of the said 1st tension | tensile_strength acts on this tension | tensile_strength connection tool, while permitting moving to the axial direction of 1 tension | tensile_strength, it adjoins this tension | tensile_strength connection tool. Thus, there is provided a tension member connecting device having a rotation restraining means for restraining the rotation of the tension member connecting device by applying a reaction force to the fixing member whose position is fixed.

  In this tendon connection tool, when the connected first tendon and second tendon are tensioned, movement in the axial direction is allowed, and the first tendon and the second tendon are predetermined. , And the rotation of the tension member connecting member due to the untwisting action of the stranded wire is restrained by the rotation restraining means.

  As explained above, in the rotation restraint structure of the tension member connecting device or the tension member connecting device according to the present invention, when the tension force is introduced by connecting the tension material composed of the steel strand and the other tension material, the steel It is possible to prevent other tension members from being twisted by the twisting-back action of the stranded wire, and loosening from occurring in the portion where the male thread portion and the female thread portion of the tension member connector are twisted together.

It is a schematic sectional drawing which shows the tension | tensile_strength material connector with which the rotation restraint structure which is one Embodiment of the invention which concerns on Claim 1 was applied. It is the side view and front view of a steel block which are used with the tendon connection tool shown in FIG. FIG. 2 is a side view and a front view of a rod used in the tension member connector shown in FIG. 1 and a side view of a pressing member that can be attached to the rod. It is the schematic which shows the side view and front view of a steel sleeve which are used with the tension material connector shown in FIG. It is the side view and front view which show the 1st engaging member used with the tension material connecting tool shown in FIG. It is the front view and side view which show the 2nd engaging member used in order to restrain rotation of the tendon connection tool shown in FIG. It is a schematic sectional drawing which shows the tension | tensile_strength connection tool with which the rotation restraint structure which is other embodiment of the invention which concerns on Claim 1 was applied. It is the side view and front view which show the 1st engaging member used with the tension material connecting tool shown in FIG. It is the front view and side view which show the 2nd engaging member used in order to restrain rotation of the tension material connecting tool shown in FIG. It is a schematic sectional drawing which shows the tension material connector with which the rotation restraint structure which is one Embodiment of the invention which concerns on Claim 4 was applied. It is the side view and front view which show the steel sleeve used with the tendon connection tool shown in FIG. It is the front view and side view which show the engaging member used in order to restrain rotation of the tension | tensile_strength material connector shown in FIG. It is a schematic sectional drawing which shows the tension | tensile_strength connection tool with which the rotation restraint structure which is other embodiment of the invention which concerns on Claim 4 was applied. It is the side view and front view which show the steel sleeve used with the tendon connection tool shown in FIG. It is sectional drawing and a side view which show a part of sheath used by the rotation restraint structure of the tension material connector shown in FIG. It is the schematic for demonstrating the problem of the conventional tendon connection tool.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic cross-sectional view showing a tendon connection tool to which a rotation restraint structure according to an embodiment of the present invention is applied.
This tension material connector connects the first tension material 1 in which 12 steel wires 3 are bundled with the second tension material 2 in which 19 steel wires are twisted to form a single strand 4 of steel. To do. The first tendon member 1 and the second tendon member 2 are arranged in a sheath 6 embedded in the concrete member 5, and are introduced into the concrete member 5 by introducing a tension force and fixing to the concrete member 5. It introduces prestress. The twelve steel wires 3 constituting the first tendon 1 all have a diameter of 8 mm. Moreover, the steel strand 4 which is the 2nd tension material 2 twists 19 steel wires, and makes diameter 28.6 mm.

  The above-mentioned tendon connecting tool is attached to each of the steel block 11 to which each of the steel wires 3 constituting the first tendon 1 is locked and each of the twelve steel wire insertion holes 11a provided in the steel block 11. A wedge 12 for fixing the steel wire 3 to the steel block 11, a rod 13 connected to the steel block 11, a pressing member 14 attached to the rod 13 and holding the wedge 12 via a spring 17, and the above A steel member 15 which is a cylindrical member connected to the rod 13 and is an end connecting member to which the second tendon is joined, and the steel sleeve 15 is inserted into the substantially cylindrical shape. The main part is composed of the wedge 16 for fixing the second tension material 2 made to the steel sleeve 15. Then, as the rotation restraining means for suppressing the tension member connecting tool from rotating around the axis of the second tension member 2, the tension member connecting tool includes the first engagement member 20 fixed to the steel sleeve 15. The second engaging member 30 is fixed to the concrete member 5 having the second tendon 2 around. The first engagement member 20 and the second engagement member 30 are engaged with each other so as to restrain the relative rotation about the axis.

As shown in FIG. 2, the steel block 11 has a front surface and a rear surface that are formed flat and parallel to each other, and the side surface forms a cylindrical curved surface. A central hole 11b is formed along the center line of the cylindrical curved surface from the center of the front surface, and twelve steel wire insertion holes 11a penetrating the rear surface at equal intervals in the circumferential direction are formed around the central hole 11b.
The center hole 11b has a female screw cut on the inner peripheral surface, and the depth thereof is set so that the screw-in length of the rod 13 screwed with the female screw is sufficiently long. The central hole 11b may penetrate the rear surface.
The steel wire insertion hole 11a is provided to be inclined so as to approach the center side from the front side toward the rear side. The inner diameter of the steel wire insertion hole 11a is such that the steel wire 3 can be freely inserted in the vicinity of the rear surface, and the inner diameter gradually increases toward the front surface on the front surface side. The wedge 12 is pushed between the inner peripheral surface and the steel wire 3 by the inner diameter enlarged portion 11 c to fix the steel wire 3 to the steel block 11.

The rod 13 is a rod-shaped member as shown in FIG. 3, and a first male screw portion 13b is formed in a predetermined range from a first end 13a which is an end screwed into the steel block 11, and the other A second male screw portion 13d is formed in a predetermined range from the second end 13c, which is the end of the second end. Between the first male screw portion 13b and the second male screw portion 13d, there is formed a tool locking portion 13e having a flat side surface without forming a male screw, and this rod 13 is rotated around the axis. Therefore, a tool such as a wrench can be fitted. One of the first male screw portion 13b and the second male screw portion 13d is a so-called reverse screw, and the spiral inclination direction is provided in the reverse direction. Accordingly, the internal thread of the center hole 11b of the steel block 11 to be screwed with the external thread portion that has become the reverse thread, or the internal thread of the sleeve 15 (which will be described in detail later) is also a reverse thread. Further, the first male screw portion 13b and the second male screw portion 13d have different screw pitches. In the present embodiment, the screw pitch of the first male screw portion 13b is the second screw screw pitch. It is smaller than the thread-like pitch of the male screw portion 13d. Therefore, the length in the axial direction in which the first male screw portion 13b is screwed into the female screw with the same rotation amount is smaller than the length in which the second male screw portion 13d is screwed.
The second end 13c of the rod 13 is formed with a hole 13f in the axial direction from the center of the end face to avoid interference with the end of the second tendon material 2.

  The pressing member 14 is a disk-shaped member having an opening 14 a at the center, and a female screw is cut on the inner peripheral surface of the opening and is screwed into the first male screw portion 13 b of the rod 13. . Therefore, it is possible to move in the axial direction of the rod 13 by rotating, and the wedge 12 pushed between the steel wire 3 and the inner peripheral surface of the steel wire insertion hole of the steel block 11 as shown in FIG. Is pressed through a spring 17 so as not to come out.

As shown in FIG. 4, the steel sleeve 15 has a cylindrical side surface, and a hollow hole 15 a is formed in the axial direction. The hollow hole 15a has an inner diameter that changes in the axial direction. The inner diameter is the largest in a predetermined range from the first end 15b, which is one end in the axial direction, and the second male screw portion 13d of the rod 13 is provided. The internal thread portion 15c can be screwed. On the other end side from the female screw portion 15c, that is, the second end 15d side, the inner diameter of the hollow hole 15a is gradually reduced so that the second tendon 2 can be freely inserted through the second end 15d. ing.
Further, a wedge inspection hole 15e penetrating from the hollow hole 15a to the outer peripheral surface is formed between the female screw portion 15c of the steel sleeve 15 and a portion where the inner diameter is reduced. The wedge inspection hole 15e allows the state of the wedge 16 to be confirmed after the wedge 16 is pushed in and the steel strand 4 is fixed to the steel sleeve 15.

  A plurality of bolt holes 15 f are formed on the end surface of the second end 15 d of the steel sleeve 15 around a hollow hole 15 a through which the second tendon 2 is inserted. The bolt hole 15f is provided in the axial direction of the second tension member 2, and an internal thread is cut on the inner peripheral surface. The first engagement member 20 is fixed by a bolt 18 screwed into the bolt hole 15f.

  The wedge 16 is obtained by dividing an axially symmetric member whose outer peripheral surface is a conical curved surface and whose inner peripheral surface is a cylindrical curved surface into a plurality of members in the circumferential direction. And as shown in FIG. 1, between the 2nd tension | tensile_strength material 2 inserted in the hollow hole 15a from the 2nd end 15d side of the steel sleeve 15, and the inner peripheral surface where the steel sleeve 15 is gradually reduced | reduced The steel sleeve 15 is pushed in from the first end 15b side. Therefore, the outer peripheral surface that is a conical curved surface is pressed against the inner peripheral surface of the steel sleeve 15 whose diameter is gradually reduced, and the inner peripheral surface that is a cylindrical curved surface is pressed to the peripheral surface of the second tension member 2. . Thus, when the steel sleeve 15 and the second tendon 2 are pushed in, the circumferential dimension of each of the divided wedges is such that a gap is generated between the plurality of divided wedges. Is set. In addition, the surface of the wedge 16 that is pressed against the second tendon 2 is provided with a measure to increase friction so that no slip occurs between the second tendon 2.

  The first engagement member 20 includes a base portion 21 fixed to the steel sleeve 15 and a square tube portion 22 protruding from the base portion 21 in the axial direction of the second tension member 2 and functioning as a protruding member. Is. The base portion 21 is formed of a plate-shaped member made of steel, and has an outer shape that is a circle having the same size as the end surface of the second end 15 d of the steel sleeve 15. The outer shape does not have to be circular, and may be any shape and size that can move in the axial direction of the second tendon 2 in the sheath 7 of the connecting portion. A central hole 21a through which the second tendon material 2 can be inserted is provided at the center of the base 21, and a plurality of bolt holes 21b are formed around it. The base 21 is brought into contact with the end surface of the second end 15d of the steel sleeve 15, and the bolt 18 inserted through the bolt hole 21b is screwed into a bolt hole 15f provided in the steel sleeve 15 and tightened to tighten the base 21 to the steel sleeve 15. It can be fixed to.

  The square tube portion 22 is formed of a tubular member made of steel having a substantially square cross section. And it is attached by welding inside the position where the bolt hole 21b is formed around the center hole 21a of the base 21. Therefore, when the second tendon 2 is inserted into the hollow hole 15a of the steel sleeve 15 and joined to the steel sleeve 15, the second tendon 2 is surrounded by the second end 15d of the steel sleeve 15 around the second tendon 2. The square tube portion 22 protrudes in a direction along the second tendon.

  As shown in FIG. 1, the second engagement member 30 is fixed to the concrete member 5 between the sheath 7 of the connection portion that covers the connection portion of the tendon and the sheath 6 of the standard portion, A plate-like base portion 31 made of steel and a square tube portion 32 protruding from the base portion 31 in the axial direction of the second tendon 2 are provided. The base 31 is formed with a central hole 31a through which the second tendon 2 is inserted at the center, and a bolt hole 31b through which the bolt 8 can be inserted. The square tube portion 32 is joined to the surface of the base portion 31 facing the first engagement member 20 around the center hole 31a by welding, and the standard sheath 6 is joined to the opposite surface. Has been. In addition, the sheath 7 of the connection portion is joined to the outer peripheral portion of the surface facing the first engagement member 20. The bolt hole 31b has a female screw cut on the inner peripheral surface, and the bolt 8 screwed into the bolt hole 31b from the surface facing the first engaging member 20 is attached to the opposite side. Therefore, the tip of the bolt 8 is embedded in the concrete that is placed so as to embed the sheath 7 of the connector and the sheath 6 of the standard part, and the base 31 of the second engagement member 30 is fixed to the concrete member 5. It has become a thing.

  The square tube portion 32 is formed of a tubular member made of steel having a substantially square cross-sectional shape, and the first engagement member 20 has a dimension on one side of the inner peripheral surface that is substantially square in cross-section. It is larger than the dimension of one side of the outer peripheral surface in the cross section of the provided square tube portion 22. And the square tube part 32 of the 2nd engagement member 30 protrudes so that the square tube part 22 of the 1st engagement member 20 may be opposed, and the square tube of the 1st engagement member 20 is located inside a front-end | tip part. Part 22 is inserted.

  In the first tendon 1, the end opposite to the end connected to the second tendon 2 is fixed to the concrete member 5. And as for the 2nd tension material 2, the edge part on the opposite side to the edge part connected with the 1st tension material 1 is hold | gripped with a jack, and tension force is introduce | transduced. The tension is transmitted from the second tension material 2 to the first tension material 1 via the tension material connector, and the first tension material 1 is stretched. Accordingly, the tension member connecting tool moves to the tension side, but the first engagement member 20 and the second engagement member 30 allow the movement of the tension member connecting tool in the axial direction without restraining each other. . Therefore, a predetermined tension force is introduced into the first tension material 1 and the second tension material 2. Further, the steel sleeve 15 tries to rotate around the axis of the second tendon material 2 by the untwisting action of the second tendon material 2 with the introduction of the tension force, but the square tube included in the first engagement member 20. The vicinity of the apex portion of the portion 22 hits the inner peripheral surface inside the square tube portion 32 of the second engagement member 30, and rotation is restricted. Thereby, the rotational force due to the untwisting action of the second tendon 2 is not transmitted to the rod 13, the steel block 11, and the first tendon 1, and the first tendon 1 bundled with the steel wire is twisted. It is prevented from occurring. Further, it is possible to prevent the portion where the steel sleeve 15 and the rod 13 are twisted together or the portion where the rod 13 and the steel block 11 are twisted out from coming out.

FIG. 7 is a schematic cross-sectional view showing a tendon connection tool to which a rotation restraint structure according to another embodiment of the present invention is applied. 8 and 9 are a side view and a front view showing the first engagement member and the second engagement member used in this rotation restricting structure.
This tendon connection tool is similar to the tendon connection tool shown in FIG. 1, by twisting the first tendon 1 and the 19 steel wires in which 12 steel wires 3 are bundled together to form a single strand of steel. 4 is connected to the second tendon material 2. And the steel block 11, the wedge 12, the rod 13, the pressing member 14, the steel sleeve 15, and the wedge 16 are the same as the tension material connector shown in FIG. And in the rotation restraint structure applied to this tension material connector, it replaces with the 1st engagement member 20 and the 2nd engagement member 30 which are shown in FIG.5 and FIG.6, and is shown in FIG.8 and FIG.9. One engaging member 40 and the second engaging member 50 are used.

The first engagement member 40 is fixed to the steel sleeve 15, and protrudes in the axial direction of the second tension member 2 from the base 41 fixed to the steel sleeve 15 and the base 41, and a protruding member And has a tubular portion 42 that functions as: The base 41 has the same form as the engaging member shown in FIG. 5 and is fixed to the steel sleeve 15 by the bolt 18.
The tubular portion 42 is formed of a tube member made of steel having a substantially circular cross section. And it is attached by welding inside the position where the bolt hole 41b is formed around the center hole 41a of the base 41. And the two convex-shaped parts 42a are provided in the outer side of the front-end | tip vicinity protruded in the axial direction of the 2nd tension material 2. As shown in FIG.

The second engaging member 50 has a plate-like base 51 and a tubular portion 52 protruding from the base 51 in the axial direction of the second tendon 2, similarly to the engaging member shown in FIG. 6. Is. The base 51 has the same structure as that of the engaging member 30 shown in FIG. 6, and the tip of the bolt 8 screwed into the bolt hole 51 a can be embedded and fixed in the concrete member 5.
The tubular portion 52 is formed of a tube member made of steel having a substantially circular cross-sectional shape, and one end is fixed around the center hole 51 a of the base portion 51. The radius of the inner peripheral surface of the tubular portion 52 is larger than the radius of the outer peripheral surface of the tubular portion 42 included in the first engagement member 40. An axial groove 52a is formed on the inner peripheral surface of the tubular portion 52 at a position corresponding to the position where the convex portion 42a is provided in the tubular portion 42 of the first engaging member 40 in the circumferential direction. The groove 52a has such a size that the convex portion 42a can be inserted.

  The tubular portion 52 of the second engaging member 50 protrudes from the base portion 51 so as to face the tubular portion 42 of the first engaging member 40, and the tubular portion of the first engaging member 40 is located inside the distal end portion. 42 is inserted. The convex portion 42 a provided on the tubular portion 42 of the first engagement member 40 is inserted into a groove 52 a provided on the tubular portion 52 of the second engagement member 50.

  In the tension member connecting device to which such an anti-rotation structure is applied, when a tension force is introduced into the first tension member 1 and the second tension member 2 and the tension member connecting member moves in the axial direction, steel is used. The convex portion 42 a of the first engagement member 40 fixed to the sleeve 15 is along the axial direction of the second tension member 2 in the groove 52 a of the second engagement member 50 fixed to the concrete member 5. Move. Therefore, the movement of the tension member connecting device is not restricted, and tension force is appropriately introduced into the first tension material 1 and the second tension material 2. Further, the rotational force acts on the tension member connecting device by the untwisting action of the second tension member 2, but the convex portion 42 a of the first engagement member 40 is within the groove 52 a of the second engagement member 50. The contact with the side surface of the groove is restrained from moving in the circumferential direction. Therefore, rotation around the axis of the tendon connecting tool is restrained, and the first tendon 1 can be prevented from being twisted.

FIG. 10: is a schematic sectional drawing which shows the tension | tensile_strength connection tool with which the rotation restraint structure which is one Embodiment of the invention which concerns on Claim 4 was applied. FIG. 11 is a side view and a front view of a steel sleeve used in this tendon connection tool, and FIG. 12 is a front view and a side view showing an engagement member used in the rotation restraint structure of the tendon connection tool. FIG.
As in the connector shown in FIG. 1, the tension member connector is formed by twisting a first tension member 1, which is a bundle of 12 steel wires 3, and 19 steel wires together with a single steel strand 4. The steel block 11, the wedge 12, the rod 13, the pressing member 14 and the wedge 16 are the same as those shown in FIG. 1. Then, the engaging member 60 is fixed to the concrete member 5 into which prestress is introduced by the first tendon 1 and the second tendon 2 to constitute a rotation restraint structure.

The steel sleeve 71 used in this connector has a hollow hole 71a formed in the axial direction in the same manner as the steel sleeve 15 shown in FIG. 4, and the second end of the rod 13 from the first end 71b, which is one end in the axial direction. The male screw portion 13d can be screwed in. Further, from the other end side, that is, from the second end 71c side, the second tendon 2 can be inserted into the hollow hole 71a and coupled by the wedge 16.
On the end surface of the second end 71c of the steel sleeve 71, that is, the end surface on the side where the inner diameter of the hollow hole 71a is reduced, there is a hole around the hollow hole 71a through which the second tendon material 2 is inserted, as shown in FIG. 71d is formed. The hole 71d is provided in the axial direction of the second tendon 2 and the inner peripheral surface is a smooth cylindrical curved surface, and a single hole may be provided. It is desirable to provide a plurality around the hollow hole 71a through which the second tendon 2 is inserted as shown in FIG.

  As shown in FIG. 12, the engaging member 60 is fixed to the concrete member 5 as a fixing member between the sheath 7 of the connecting portion that covers the connecting portion of the tendon and the sheath 6 of the standard portion. is there. A plate-like base 61 made of steel and a rod-like body 62 protruding from the base 61 in the axial direction of the second tendon 2 are provided. The base 61 is arranged so that the sheath 7 of the connecting portion is connected to one surface and the standard sheath 6 is connected to the other surface so as to face the end surface of the second end 71 c of the steel sleeve 71. A central hole 61a through which the second tendon 2 is inserted is formed at the center of the base 61, and a plurality of bolt holes 61b are provided around the center hole 61a. The internal peripheral surfaces of these bolt holes 61b are cut by internal threads, and can be fixed by screwing external thread portions formed in the rod-shaped body 62 and tightening nuts 63. These bolt holes 61 b are provided at positions corresponding to the holes 71 d formed in the end surface of the opposing steel sleeve 71, and the rod-like body 62 screwed and fixed into these bolt holes 61 b is opposed to the steel sleeve 71. It protrudes to the side to be inserted and is inserted into the hole 71d of the steel sleeve.

  In the tension member connecting device to which such an anti-rotation structure is applied, when a tension force is introduced to the first tension member 1 and the second tension member 2, the tension member connecting member moves in the axial direction. At this time, the rod-like body 62 of the engaging member 60 fixed to the concrete member 5 is further inserted into the hole 71d provided in the steel sleeve 71, and the movement of the tension member connecting device is restricted. Absent. In addition, a rotational force acts on the tension member connecting device due to the twisting-back action caused by the introduction of the tension force to the second tension member 2, but the rod-shaped body 62 of the engagement member 60 is placed in the hole 71 d of the steel sleeve 71. The steel sleeve 71 is restrained by the rod-shaped body 62 and rotation is restrained. Therefore, it is possible to prevent the rotational force around the axis from being transmitted to the portion where the male thread and female thread of the tendon connecting member are twisted together and the first tendon 1.

FIG. 13: is a schematic sectional drawing which shows the tension | tensile_strength connection tool with which the rotation restraint structure which is other embodiment of the invention which concerns on Claim 4 was applied. FIG. 14 is a side view and a front view of a steel sleeve used in the tendon connection tool, and FIG. 15 shows a part of the sheath of the connection portion used in the rotation restraint structure of the tendon connection tool. It is sectional drawing and a side view.
This tendon connection tool is similar to the tendon connection tool shown in FIG. 1, by twisting the first tendon 1 and the 19 steel wires in which 12 steel wires 3 are bundled together to form a single strand of steel. 4 is connected to the second tendon 2, and the steel block 11, the wedge 12, the rod 13, the pressing member 14, and the wedge 16 are the same as those shown in FIG. 1. And in this tension material connector, the steel sleeve 91 which is an edge part connection member is provided with the convex-shaped part 92 which functions as an engaging member of a rotation restraint structure, and was formed in the part 80 of the sheath of a connection part. The convex portion 92 is inserted into the groove 81.

As with the steel sleeve shown in FIG. 4, the steel sleeve 91 that can be used in this tension member connector has a hollow hole 91 a formed in the axial direction, and the second male screw portion 13 d of the rod 13 from the first end 91 b in the axial direction. Can be screwed in. Further, from the second end 91c side, the second tendon 2 can be inserted into the hollow hole 91a and coupled by the wedge 16.
In the vicinity of the second end 91c of this steel sleeve 91, that is, the end on the side where the inner diameter of the hollow hole 91a is reduced, as shown in FIG. 13 and FIG. Is formed. The convex portions 92 are formed integrally with the steel sleeve 91, and one may be provided on the peripheral surface, but it is desirable to provide a plurality as shown in FIG.

  Further, as shown in FIGS. 13 and 15, the sheath of the connecting portion used in the rotation restraint structure of the tension member connecting tool is within a range in which the convex portion 92 provided on the steel sleeve 91 moves in the axial direction. A groove 81 is formed on the inner peripheral surface. A groove-type steel member 82 is used for the portion that becomes the groove 81, and a peripheral surface of a part 80 of the sheath of the connecting portion is formed by joining a steel thin plate 83 to the outer surface of the steel member 82. Yes. The steel thin plate 83 is bent with a curvature that forms a substantially cylindrical space in the sheath of the connection portion, and the end portion includes a portion 83a bent outward. The bent portion 83a is brought into contact with the outer surface of the grooved steel member 82, and the inner peripheral surface of the bent steel sheet 83 is fixed so that it is substantially aligned with the opening of the grooved steel member 82 in the circumferential direction. Is done. In this way, the same number of groove-shaped steel members 82 and the bent steel thin plates 83 are connected in the circumferential direction to form a cylindrical space in which the tension material connector is accommodated inside, and toward the inside. A groove 81 is formed by the opened groove-shaped steel member 82.

  A part 80 of the sheath of the connecting portion formed in this way is connected to a base portion 84 made of steel and the other end is connected to a sheath 85 of a cylindrical connecting portion. The standard portion sheath 6 is connected to the opposite surface of the base portion 84. Then, the concrete constituting the concrete member 5 is placed outside the sheaths 80 and 85 of the connection part and the sheath 6 of the standard part, so that the sheaths 80 and 85 of the connection part including the steel member 82 become the concrete member. Fixed.

  In such an anti-rotation structure, a tension force is introduced into the first tension material 1 and the second tension material 2 and is formed integrally with the steel sleeve 91 when the tension material connector moves in the axial direction. The protruding convex portion 92 moves in the axial direction of the second tendon 2 in the groove 81, and the convex portion 92 does not restrain the movement of the tendon connecting member. In addition, a rotational force acts on the tension member connecting device due to the twisting-back action caused by the introduction of the tension force to the second tension member 2, but the convex portion 92 constituting the engaging member is a groove-type steel member 82. The rotation of the steel sleeve 91 is constrained. Therefore, it is possible to prevent the rotational force around the axis from being transmitted to the portion where the male thread and female thread of the tendon connecting member are twisted together and the first tendon 1.

The above-described rotation restraint structure of the tendon connection tool and the tendon connection tool are embodiments of the present invention, and the present invention is not limited to these, and the shape and dimensions are within the scope of the present invention. Etc. can be implemented with appropriate changes.
For example, the invention according to claim 1 includes a tubular member in which the first engagement member and the second engagement member protrude in opposite directions in the embodiment shown in FIG. 1 or FIG. These members interfere so as to constrain rotation around the axis of the tension member connector, but the members protruding so as to face each other are not limited to tubular members, but are rod-shaped members or plates A shaped member may protrude around the second tendon and the other interferes to constrain one rotation. Further, the second engagement member is not limited to the one projecting in the axial direction of the second tendon material, but is substantially the center of the second tendon member from the fixing member around the second tendon member. It may be protruding toward the surface.

On the other hand, in the embodiment according to claim 4, in the embodiment shown in FIG. 10, the engaging member 60 fixed to the fixing member is provided with the rod-shaped body 62, but the steel sleeve is an end coupling member. The engagement member fixed to the second member may have a rod-like body protruding in the axial direction of the second tension member, and may be inserted into an axial hole provided in the fixing member so as to be able to advance and retreat.
Further, in the embodiment shown in FIG. 10, the rod-shaped body provided in the engaging member is inserted into the hole of the steel sleeve, but instead of the hole of the steel sleeve, the outer circumferential surface of the steel sleeve is arranged in the axial direction. A groove may be provided and inserted into the groove.

In the embodiment shown in FIG. 13, the convex portion that is the engaging member is integrally formed with the steel sleeve that is the end coupling member, but the convex portion is formed by screwing a bolt or the like into the steel sleeve. It may be a thing.
Moreover, the protrusion which protrudes inside from an inner peripheral surface may be provided in the sheath of a connection part as an engaging member, and the said protrusion may be inserted in the groove | channel of the axial direction formed in the outer peripheral surface of a steel sleeve.

On the other hand, in the embodiment described above, the second tendon connected to the first tendon is a single strand of steel, but also in a tendon that bundles multiple strands of steel. A twisting action may occur, and the second tendon may be a bundle of a plurality of steel wires.
The end coupling member to which the second tendon is coupled employs a steel sleeve to which the second tendon is coupled using a wedge in the described embodiment, but using a mortar or an adhesive. Alternatively, the second tension member may be bonded by compressing and deforming the steel sleeve.
Moreover, although the 1st tension material shall be what bundled the some steel wire in embodiment demonstrated, it is not limited to this, Steel wire, what bundled the wire from steel, steel rod Bundles of synthetic fibers such as aramid fibers may also be used. And the structure which hold | grips the edge part of these tendons and connects with a 2nd tendon can also be selected suitably according to a kind.

1: first tendon, 2: second tendon, 3: steel wire constituting the first tendon, 4: steel strand constituting the second tendon, 5: concrete member, 6: Standard part sheath, 7: Connection part sheath, 8: Bolt,
11: Steel block, 11a: Steel wire insertion hole provided in the steel block, 11b: Center hole, 11c: Inner diameter enlarged portion of the steel wire insertion hole, 12: Wedge, 13: Rod, 13a: Axis in the axial direction of the rod 1 end, 13b: first male threaded portion, 13c: second end in the axial direction of the rod, 13d: second male threaded portion, 13e: tool locking portion, 14: pressing member, 14a: opening in the central portion, 15 : Steel sleeve, 15a: Hollow hole, 15b: First end in the axial direction of the steel sleeve, 15c: Female thread portion of the steel sleeve, 15d: Second end in the axial direction of the steel sleeve, 15e: Wedge inspection hole, 15f: Steel Hole provided in sleeve, 16: wedge, 17: spring, 18: bolt,
20: First engaging member, 21: Base portion of first engaging member, 21a: Center hole, 21b: Bolt hole, 22: Square tube portion of first engaging member,
30: Second engaging member, 31: Base portion of second engaging member, 31a: Center hole, 31b: Bolt hole, 32: Square tube portion of second engaging member,
40: first engaging member, 41: base portion of the first engaging member, 41a: center hole, 41b: bolt hole, 42: tubular portion of the first engaging member, 42a: convex portion,
50: second engaging member, 51: base portion of the second engaging member, 51a: center hole, 51b: bolt hole, 52: tubular portion of the second engaging member, 52a: groove,
60: engaging member, 61: base portion of engaging member, 61a: center hole, 61b: bolt hole, 62: rod-shaped body, 63: nut,
71: Steel sleeve, 71a: Hollow hole, 71b: First end in the axial direction of the steel sleeve, 71c: Second end in the axial direction of the steel sleeve, 71d: Hole into which the rod-shaped body is inserted,
80: a part of the sheath of the connection part, 81: groove, 82: a grooved steel member, 83: a steel sheet, 83a: a bent part of the steel sheet, 84: a base part, 85: a sheath of the connection part,
91: steel sleeve, 91a: hollow hole, 91b: first axial end of the steel sleeve, 91c: second axial end of the steel sleeve, 92: convex portion

Claims (8)

In the rotation restraint structure of the tension material connector that restrains the tension material connector that connects the first tension material and the second tension material made of the steel strand from rotating about the axis of the second tension material. There,
The tendon connecting tool has an end coupling member coupled to an end of the second tendon, and the second tendon is connected to the first tendon via the end coupling member. To connect,
A first engagement member is fixed to the end coupling member,
A second engagement member is fixed to a fixing member which is around the connection portion between the first tension material and the second tension material and has a fixed position,
The first engagement member and the second engagement member allow relative movement in the axial direction of the second tension member, and the end coupling member is the second tension member. A rotation constraining structure for a tension member connecting device, wherein the members are in contact with each other to constrain the rotation of the end coupling member when they are about to rotate around the axis of the member. The first engagement member fixed to the end coupling member has a protruding member protruding in the axial direction of the second tendon around the second tendon.
The second engaging member is in a position on a moving path when the projecting member rotates about the axis of the second tendon, and is in contact with the projecting member to be rotated. The rotation constraining structure for a tendon connection tool according to claim 1, characterized in that: Either one of the first engagement member and the second engagement member has a convex portion in a portion where they face each other,
The other of the first engagement member and the second engagement member is formed in the axial direction of the second tension member, and has a groove into which the convex portion is inserted. The rotation restraint structure of the tendon connection tool according to claim 1. In the rotation restraint structure of the tension material connector that restrains the tension material connector that connects the first tension material and the second tension material composed of the steel strand from rotating about the axis of the second tension material. There,
The tendon connecting tool has an end coupling member coupled to an end of the second tendon, and the second tendon is connected to the first tendon via the end coupling member. To connect,
An engaging member is fixed to one of the fixing member and the end coupling member which are located around the connecting portion between the first tendon and the second tendon and are stationary.
The engaging member allows relative movement in the axial direction of the second tendon with respect to the other of the fixing member and the end coupling member, and the end coupling member A rotation constraining structure for a tension member connecting device, characterized in that when the rotation is about the axis of the second tendon, the end connecting member comes into contact with the rotation of the end coupling member. The engagement member fixed to one of the fixing member and the end coupling member has a rod-like body protruding in the axial direction of the second tension material around the second tension material. ,
The tension member according to claim 4, wherein the other of the fixing member and the end coupling member is formed in an axial direction of the second tension member and has a hole into which the rod-like body is inserted. Rotation restraint structure for connecting tools. The engaging member fixed to one of the fixing member and the end coupling member has a convex portion at a portion where the fixing member and the end coupling member are opposed to each other.
5. The tension according to claim 4, wherein the other of the fixing member and the end coupling member has a groove formed in the axial direction of the second tension member and into which the convex portion is inserted. Rotation restraint structure for connecting materials.   The said fixing member is a concrete member into which a prestress is introduce | transduced by the tension force of the said 1st tension material or the said 2nd tension material, The any one of Claim 1-6 characterized by the above-mentioned. Rotation constraining structure of tension material connecting device A tension material connector that connects the first tension material and the second tension material, at least one of which is a steel strand, to each other,
When the tendon connecting tool is allowed to move in the axial direction of the first tendon and a force in a direction rotating around the axis of the first tendon is applied to the tendon connecting tool. A tension material connector, comprising: a rotation restraining means for restraining rotation of the tension material connector by causing a reaction force to act on a fixing member whose position is immovable adjacent to the tension material connector.

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