JP2008019579A - Fixture for tension member and tension member with fixture - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fixture for a tension member capable of easily conforming the introduction of tension, while absorbing impact energy, by relieving impact applied to the tension member by earthquake motion. <P>SOLUTION: This fixture 1 for the tension member is provided for fixing the tension member 10 composed of a cable material 2 and a socket 3 on its both ends to a structure 9 of a building by gripping the socket 3, and has a fixing plate 4 fixed to and installed in the structure 9, a bearing pressure plate 5 arranged on the fixing plate 4, contacting with the outer periphery of an impact absorbing plate 6 and having an opening part 15 for passing the cable material 2, and the impact absorbing plate 6 arranged between the socket 3 and the bearing pressure plate 5 and bendably deformable by the tension generated in the cable material 2, and has a bendably deformable void of the impact absorbing plate 6 between the impact absorbing plate 6 and the bearing pressure plate 5. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a tension member fixing tool and a tension member with a fixing tool, and in particular, to a tension member fixing tool provided with an impact absorbing plate between a socket and a bearing plate at the end of the tension member. It relates to the equipped tensile member.

  A tensile material is used as a structural member in a structure of a building or as a connection member between structures. Here, the building is a general term for objects whose framework is constituted by a structure such as a building, a civil engineering structure, a work, a power transmission tower. Moreover, a structure means the member which comprises the framework of structures, such as a pillar material, a beam material, a brace material, and foundation concrete. Also, the tensile material is a cable material, steel bar, flat bar, round steel pipe, square steel pipe, angle steel, shape material such as channel material, etc. Say. These tensile materials are characterized in that they do not bear compressive force or bending moment but bear only tensile force.

  The tensile material can be bent at an intermediate portion due to the characteristic that the ratio of the cross-sectional width to the member length is extremely small. That is, the tensile material has a characteristic that it can be attached by fitting the tensile material in a curved shape, that is, flexibility even when the two points to which the structure is connected cannot be linearly connected. For example, in the case of a cable material, it is a member that is formed by combining steel wires, and is a member that can be easily bent by this combination. The cable material includes a structural strand rope, a structural spiral rope, and the like. What is generally called a wire rope is also included in the cable material. The steel bar refers to a solid round steel, and includes a PC steel bar. What is generally called a rod is also included in the steel bar.

  Sockets for connection are attached to both ends of the tensile material. Since the tensile material does not bear a bending moment, the bending rigidity in the cross section does not become a problem, and it is general to have a compact cross section. Therefore, in order to connect the tensile material to the structure, a connecting component is required at the end thereof. For example, in a cable material, as a shape of a socket, an open socket, a closed socket, a front surface support type, a nut method, and the like are known. Furthermore, screw ends or eye compression stoppers are known as simple sockets. In this specification, not only the cable material but also all the tensile materials are collectively referred to as “sockets” for connecting parts that are attached to the end portions of the members.

  As an example of using a tensile material as a structural member in a structure, there is a case where the tensile material is used as a structural member that increases the rigidity of the structure. For example, cable-stayed bridges and brace materials. Moreover, it may be used as a component covering the space. For example, there are a tension structure in which a roof is constructed with a beam material in which a tensile material and a compression material are combined, and a cable net structure stretched on a ring-shaped boundary support structure. Among these, when used as a structural member for increasing the rigidity of the structure, the tensile material resists by receiving an impact due to the earthquake motion. On the other hand, when used as a constituent member that covers a space, vibration due to wind pressure is generated, and an impact due to earthquake motion is absorbed by the entire constituent member.

  On the other hand, as an example of using a tensile material as a connection member between structures, when connecting a column material and foundation concrete for seismic reinforcement of a building, or connecting existing bridge girders to prevent falling off due to earthquake motion There is a case. Tensile materials have been evaluated and adopted as a seismic reinforcement method for such existing buildings, because they can be connected even when they cannot be connected linearly. For example, when joining a column material to foundation concrete by seismic reinforcement, there is generally a step between the outer surface of the column material and the outer surface of the foundation, and the flexibility of the tensile material is effective.

  An initial tension is generally introduced into the tensile material. As described above, the tensile material has flexibility that can be bent at an intermediate portion thereof. Therefore, if it is only attached to both of the structures to be connected, slackening occurs due to deflection due to its own weight, clearance of the bolts to be connected, and the like. In this state, there arises a problem that the material does not function as a tensile material until the slack disappears with respect to the impact caused by the earthquake motion generated in the tensile material. In addition, since the cable material is formed by combining a large number of strands, initial elongation occurs. This initial elongation is removed by prestretching. Therefore, generally, at the time of construction, initial tension is introduced after the tension material is attached. As a method for introducing an initial tension to a general tensile material, there are a method for introducing an initial tension by a length adjusting mechanism such as a turnbuckle and a method for managing the tension by a hydraulic jack. In addition, after the tension is introduced, a part of the tension material may be lost due to creep strain or relaxation (stress relaxation).

  As the tensile material, a material having high tensile strength is usually used for reasons such as no need for welding and economy. For example, in the cable material, steel types ranging from 1470N class to 1770N class in tensile strength are used. These materials are significantly higher than steel materials (400N class, 490N class) used for ordinary structures. Moreover, in the PC steel bar which is a kind of bar steel, steel types ranging from 1720N class to 1860N class in tensile strength are used.

  Here, the viscoelastic material refers to a polymer material that has a mechanical behavior that combines a fluid-like viscosity and a spring-like elasticity. When stress is applied to this viscoelastic material, impact energy such as an earthquake is absorbed by non-linear behavior associated with the load history. The low yield point steel refers to a steel material made of a superplastic alloy having a small yield load and excellent deformation ability. When stress is applied to this low yield point steel, it absorbs impact energy such as earthquakes by the non-linear behavior associated with its load history. These viscoelastic materials and low yield point steel are used as seismic isolation dampers and damping dampers in buildings.

  On the other hand, Patent Literature 1 discloses a method for fixing a pillar and a base in a wooden building.

JP 2001-279830 A

  When an impact due to seismic motion is applied to the tensile material, an excessive stress is generated in the tensile material due to the impact, and the tensile material may be broken or the joint may be broken. Further, as described above, since the tensile material uses high-strength steel, there is a risk of brittle fracture or fatigue fracture. That is, when a tensile material is used as a structural member that increases the rigidity of the structure, an impact caused by an earthquake tends to be excessively concentrated on the tensile material that is a portion having a high rigidity of the structure. Further, when used as a connection member between structures, it is a structure added to an existing structure, and transmission and sharing of stress are unclear. Therefore, there is a possibility that an impact caused by an earthquake more than expected is generated.

  Moreover, the conventional tension | pulling material is mainly used as a structural member which covers space. In this case, the rigidity of the structural member is extremely low, and the energy due to the earthquake motion is absorbed by the deformation. However, when used as a structural member that increases the rigidity of a structure or as a connection member between structures, few have a mechanism for absorbing energy due to earthquake motion even though the rigidity of the tensile material is high. .

  Further, there is no method for easily confirming the introduced tension when the initial tension of the tensile material is introduced. In addition, there is no simple method for confirming when a part of the introduced tension is lost due to creep strain or relaxation (stress relaxation).

  An object of the present application is to solve such a problem, and to provide a tension member fixing tool capable of relieving an impact applied to a tensile material due to a seismic motion, absorbing impact energy, and confirming simple introduction of tension.

  In order to achieve the above object, a tension member fixture according to the present invention is a tension member fixture for fixing a tension member composed of a tension member and sockets at both ends thereof to a structure of a building by grasping the socket. A fixed plate that is fixed to the structure and attached; a support plate provided on the fixed plate, in contact with the outer periphery of the shock absorbing plate, and having an opening through which a tensile material passes; a socket and a support plate. And an impact absorbing plate that can be bent and deformed by a stress generated in the tensile material, and there is a gap between the impact absorbing plate and the bearing plate that allows the impact absorbing plate to be bent and deformed.

  Further, in the tension member fixture, the shock absorbing plate is made of low yield point steel and is preferably replaceable. A viscoelastic material is provided in the gap between the shock absorbing plate and the bearing plate, It is preferable that a viscoelastic material is provided in the space between the material and the bearing plate.

  Further, in the tension member fixture, it is preferable that the shock absorbing plate is erected on the socket side, and the shock absorbing plate is erected so as to become a substantially flat plate by introducing initial tension to the tensile material. preferable.

  Further, in the tension member fixture, the pressure bearing plate preferably has a cylindrical concave surface facing the shock absorbing plate, and the pressure bearing plate has a spherical concave surface facing the shock absorbing plate. It is preferable.

  Furthermore, the tension member according to the present invention is equipped with the tension member fixture.

  With the above configuration, the tension member fixture is provided with an impact absorbing plate between the socket of the tension member and the bearing plate. This shock absorbing plate absorbs this shock by bending deformation with respect to the shock at the time of an earthquake, and plays a role as a cushioning material. Thereby, it becomes possible to avoid that the impact by an earthquake concentrates too much on the tension material which is a site | part with high rigidity of a structure. In addition, an excessive impact that is not assumed in design is urged to redistribute the stress of the entire structure by deformation of the shock absorbing plate. As a result, the impact can be absorbed by the entire structure and local stress concentration can be reduced.

  Moreover, the fixture for tension members makes it possible to absorb the impact energy of the seismic motion due to the non-linear behavior accompanying the load history at the time of the earthquake by making the impact absorbing plate itself a low yield point steel. Furthermore, by providing a viscoelastic material in the gap between the bearing plate and the shock absorbing plate and a viscoelastic material in the gap between the tensile material and the bearing plate, the impact energy of the seismic motion is reduced due to the nonlinear behavior associated with the load history. Allow absorption. By concentrating the impact energy of seismic motion on these low yield point steels and viscoelastic materials, it is possible to reduce the shaking and vibration of the structure of the building and reduce the damage to the structure.

  Further, the tension member fixture is erected so that the impact absorbing plate becomes a substantially flat plate by the introduction of the initial tension to the tensile material. That is, the amount of bending deformation of the shock absorbing plate due to the introduction of the initial tension is calculated in advance, and the shock absorbing plate is erected on the socket side so as to be substantially the same value as that. Accordingly, it is possible to easily check the tension by visually observing whether or not the shock absorbing plate is a substantially flat plate. Even when the introduced initial tension is lost due to creep strain or relaxation (stress relaxation), the tension can be confirmed in the same manner.

  As described above, according to the tension member fixture according to the present invention, the impact applied to the tensile material due to the earthquake motion can be reduced, the impact energy can be absorbed, and simple introduction of the tension can be confirmed.

  Embodiments according to the present invention will be described below in detail with reference to the drawings.

  FIG. 1 shows a schematic configuration of an embodiment of a tension member fixture according to the present invention. FIG. 1A is a front view of the tension member fixture 1, FIG. 1B is a side view seen from the AA direction, and FIG. 1C is a view seen from the BB direction. FIG. In the present embodiment, the cable material 2 is used as the tensile material. The tension member fixture 1 includes a fixing plate 4, a bearing plate 5, and an impact absorbing plate 6. The cable member 2 having a socket 3 attached to an end thereof is fixed to a structure 9 with bolts 7. Further, a plate-like viscoelastic material 8 a is attached to the gap between the bearing plate 5 and the shock absorbing plate 6, and a tubular viscoelastic material 8 b is attached to the gap between the cable member 2 and the bearing plate 5. The The tension member fixture 1 and the cable member 2 to which the socket 3 is attached are collectively referred to as a tension member 10.

  The fixed plate 4 is a rectangular plate material in the present embodiment. In addition, a support plate 5 is attached to the fixed plate 4 and is fixed to the structure 9 with bolts 7. The fixed plate 4 may have a shape other than a rectangle, for example, a circle or a polygon, as long as the support plate 5 and the bolt 7 can be attached. The type of the structure 9 includes wood, steel frame, foundation concrete, and the like, but in this embodiment, the type is not limited. The bolt 7 is, for example, a lag screw bolt when the structural body 9 is wood, and is a high-strength bolt, for example, when the structural body 9 is a steel frame, and the structural body 9 is basic concrete. In some cases, it is an anchor bolt.

  In the present embodiment, the support plate 5 is obtained by machining a thick steel plate for welding and welding it to the fixed plate 4. The bearing plate 5 may be manufactured integrally with the fixed plate 4 by, for example, casting or machining. The bearing plate 5 is provided with a cable opening 15 through which the cable material 2 passes. In addition, the support plate 5 supports the socket 3 of the cable member 2 from the front surface (cable member 2 side) via the impact absorbing plate 6. That is, the fixing method of the cable material 2 is a front surface support method. Further, the surface of the bearing plate 5 that faces the shock absorbing plate 6 is a cylindrical concave surface so that the shock absorbing plate 6 can be bent and deformed. Further, the bearing plate 5 has bearing surfaces 16 in contact with the outer periphery of the shock absorbing plate 6 at two locations on the left and right sides of the cylindrical concave surface.

  FIG. 2 shows a schematic configuration of another embodiment of the bearing plate 5. Fig.2 (a) is a front view at the time of assembling the bearing plate 5 by plate welding. Moreover, FIG.2 (b) is AA sectional drawing of Fig.2 (a). The bearing plate 5 includes a top plate 5a, a side plate 5b, a reinforcing plate 5c, a bottom plate 5d (see FIG. 2B), and a curved plate 5e, which are assembled by welding. Moreover, you may attach the cylindrical board 5f for mounting | wearing with the cylindrical viscoelastic material 8b. The reinforcing plate 5c is attached as a restraining material for the side plate 5b in order to use the support point P of the shock absorbing plate 6 as a fixed end. In order to allow the cable member 2 to pass through, the support plate 5 has a cable opening 15a on the side plate 5b and a cable opening 15b on the curved plate 5e. The curved plate 5e has an arch shape in order to provide a gap that allows the shock absorbing plate 6 to be deformed. At both ends of the curved plate 5 e, a part of the side plate 5 b serves as a bearing surface 16 and contacts the outer periphery of the shock absorbing plate 6.

  In the present embodiment, the shock absorbing plate 6 is a flat plate made of a steel material (400N class, 490N class) used for a normal structure. FIG. 3 shows a schematic configuration of the shock absorbing plate 6. FIG. 3 is a cross-sectional view taken along the line BB in FIG. FIG. 3A shows the shock absorbing plate 6 in the present embodiment. The hatched area in the figure indicates the range of the shock absorbing plate 6. In the embodiment of FIG. 3A, the shock absorbing plate 6 is a rectangular plate in which the edge R of the cable opening 15 is cut. A broken line 3 indicates a range where the socket 3 contacts the shock absorbing plate 6. A line indicated by P in the figure is a support line that restrains deformation of the side plate 5b by the reinforcing plate 5c. A line indicated by Q in the figure is a support line that restrains deformation of the side plate 5b by the top plate 5a and the bottom plate 5d. Therefore, the shock absorbing plate 6 is a flat plate having the line P and the line Q in the figure as fixed ends and the edge R of the cable opening 15 as a free end.

  FIG. 3B shows another embodiment of the impact absorbing plate 6. The hatched area in the figure indicates the range of the shock absorbing plate 6. In this embodiment, the shock absorbing plate 6 is composed of two rectangular plates separated into blocks each having an edge R of the cable opening 15. A broken line 3 indicates a range where the socket 3 contacts the shock absorbing plate 6. A line indicated by P in the figure is a support line that restrains deformation of the side plate 5b by the reinforcing plate 5c. A line indicated by Q in the figure is a support line that restrains deformation of the side plate 5b by the top plate 5a and the bottom plate 5d. Therefore, the shock absorbing plate 6 is two flat plates having the line P and the line Q in the figure as fixed ends and the edge R of the cable opening 15 as a free end.

  When the cable member 2 receives a tensile force due to the earthquake motion, the socket 3 pushes the shock absorbing plate 6. At this time, the shock absorbing plate 6 is deformed by receiving a compressive force from the end of the socket 3 surrounded by the broken line 3. The deformation shape of the shock absorbing plate 6 is a deformation curve due to flat plate bending under the above-described boundary conditions for each of FIGS. 3 (a) and 3 (b).

  Another embodiment of the shock absorbing plate 6 is a case where a flat plate made of low yield point steel is used. Low yield point steel is also called ultra-soft steel, and is close to pure iron with the additive elements reduced as much as possible, and is a steel type whose yield point is lowered by heat treatment such as soft annealing after rolling. The low yield point steel includes a low yield point steel having a yield point of 235N class and an ultra low yield point steel having a class N of 100N, either of which may be used. The shock absorbing plate 6 using this low yield point steel is bent and deformed by the tensile force generated in the cable material 2 at the time of an earthquake, but yields earlier than other members due to the deformation, and the input energy of the earthquake is obtained by repeated load history. Absorb. In other words, it functions as a damper that reduces shaking and deformation during an earthquake. In particular, when a tensile member is used as a connecting member between structures and the column member 11 and the foundation concrete 12 are joined for the seismic reinforcement of a building, the input energy of the earthquake is concentrated on the shock absorbing plate 6 in a concentrated manner. Thus, it is possible to reduce damage to the structure of the building due to the earthquake.

  However, the shock absorbing plate 6 needs to be replaced when it is plasticized by the earthquake motion. In the present embodiment, the tension of the cable member 2 is released using a jig such as a ram chair, which will be described later, and the impact absorbing plate 6 is replaced. That is, the position of the shock absorbing plate 6 is not fixed to the bearing plate 5 but is fixed by the frictional force due to the introduction of the initial tension. In order to mechanically fix the position of the shock absorbing plate 6, a “umbilical” may be provided on one surface of the bearing plate 5 or the shock absorbing plate 6, and a “umbilical hole” may be provided and inserted on the other. Alternatively, “umbilical holes” may be provided on the opposing surfaces of both the bearing plate 5 and the shock absorbing plate 6 and a bar may be inserted there. By these means, it is possible to prevent the displacement of the bearing plate 5 and the shock absorbing plate 6.

  In the present embodiment, the cable material 2 uses a structural strand rope. The strand rope means a strand shape in which 7 to 41 strands are further combined to form a rope shape. In general, six side strands are more closely aligned around the heart. The structural strand rope is characterized by high flexibility and high flexibility due to the additional strands. The element wire is made of a high carbon steel wire, and the tensile strength is mainly 1470N class, 1670N class, 1770N class or the like. This strand is galvanized after cold working. The cable material 2 may be a structural spiral rope or other type of cable material. Furthermore, a steel bar including a PC steel bar, a flat bar, a round steel pipe, a square steel pipe, a shape steel such as an angle material or a channel material, or the like may be used. Sockets 3 are attached to both ends of the cable member 2.

  The socket 3 is a cylindrical fixing component that fixes the end of the cable member 2. The cross-sectional shape of the socket 3 is not limited to a cylindrical shape, and may be, for example, a polygonal column or a conical shape. In general, the socket 3 of the cable material 2 includes a method in which the strands of the wire rope are separated into a tea-like shape (a bowl shape) inside the cone of the socket 3 and a zinc-copper alloy is cast, and the socket 3 is attached to the cable material 2. There is a method of mounting and crimping the socket 3 with a press, a rotary swage or the like. The former is a mechanism that obtains fixing force by adhesion between the wire and the zinc-copper alloy, and the zinc-copper alloy and the inside of the cone of the socket 3 by surface pressure and frictional force. On the other hand, the latter is a mechanism that obtains a fixing force by biting between the inner surface of the socket 3 and the surface of the cable member 2 that occur during crimping. In this embodiment, the socket 3 is fixed to the structural strand rope by the latter method, but the former method may be used.

  The socket 3 is a cylindrical nut whose inner surface is threaded when the tensile material is a steel rod. In this case, the steel bar is engaged with a screw cut at the end of the steel bar. Therefore, the present embodiment can be applied as it is. In addition, even if the tensile material is a flat bar, round steel pipe, square steel pipe, angle steel, shape steel such as channel material, etc., welded joints, screws, or sockets 3 are passed through the end portions thereof. The present embodiment can be applied as it is by a method such as stopping by an end plate.

FIG. 4 shows a schematic front view of another embodiment of the shock absorbing plate 6. The shock absorbing plate 6 stands on the socket 3 side so as to become a substantially flat plate by introducing an initial tension to the cable member 2. That is, the initial tension F ₀ is introduced into the cable member 2, and the shock absorbing plate 6 is deformed by the initial tension F ₀ . The deformation curve can be predicted in advance by calculation or experiment using a simple dynamic model. By giving the shock absorbing plate 6 a peel D in the direction opposite to the deformation curve, it becomes a substantially flat plate after the deformation. In the present embodiment, the shape of the peel D is a cylindrical shape, but may be a spherical shape, an arc shape, an elliptical shape, or a polygonal line shape as long as it stands up. Further, the deformation D may not be the same as the deformation curve D of the shock absorbing plate 6. That is, the Mukuri amount d of FIG. 4, may be the initial tension F ₀ maximum deformation amount of the shock absorbing plate 6 by and set to be substantially the same. Further, in the present embodiment, the peel D is provided on a part of the shock absorbing plate 6 as shown in FIG. This peel D may be provided at a portion other than the portion in contact with the bearing surface 16 of the shock absorbing plate 6. The Mukuri D by providing the, upon introduction of the initial tension F _0, the shock absorbing plate 6 is possible to easily tension confirmed by visual observation whether a substantially flat plate. Similarly, the tension can be confirmed even when the introduced initial tension F ₀ is lost due to creep strain or relaxation (stress relaxation).

  FIG. 5 illustrates a schematic configuration of another embodiment of the bearing plate 5. Fig.5 (a) is CC sectional drawing of Fig.1 (a). FIG.5 (b) is AA sectional drawing of Fig.5 (a). In the present embodiment, the surface of the bearing plate 5 that faces the shock absorbing plate 6 is a spherical concave surface. That is, this is a case where the gap 18 between the bearing plate 5 and the shock absorbing plate 6 has a shape obtained by cutting a part of a sphere. As shown in FIG. 5B, in this embodiment, the pressure bearing plate 5 is in contact with the entire outer periphery of the shock absorbing plate 6. In addition, a line indicated by P in the figure is a fixed end that restrains the deformation of the shock absorbing plate 6 by the bearing plate 5. Therefore, the shock absorbing plate 6 is a rectangular flat plate having the line indicated by P as a fixed end and the edge R of the cable opening 15 as a free end. In this embodiment of the bearing plate 5, the plate-like viscoelastic material 8 a is closed to the gap 18 between the bearing plate 5 and the shock absorbing plate 6 and is not exposed to the outside.

  FIG. 6 is an explanatory diagram of a schematic configuration of the viscoelastic material 8. FIG. 6 is a perspective view, in which the bearing plate 5 is indicated by a broken line, and a portion related to the viscoelastic material 8 is indicated by a solid line for easy understanding. The viscoelastic material 8 includes a plate-like viscoelastic material 8a and a cylindrical viscoelastic material 8b. In each of the embodiments of the tension member fixture 1 described above, a plate-like viscoelastic material 8 a is inserted into the gap 18 between the bearing plate 5 and the shock absorbing plate 6, and between the cable member 2 and the bearing plate 5. The cylindrical viscoelastic material 8 b is inserted into the gap 19. These viscoelastic materials 8 may be attached to either one or both.

  The plate-like viscoelastic material 8a receives the compressive stress C when the impact absorbing plate 6 is forcibly deformed by the tensile force F. As described above, when stress is applied to the plate-like viscoelastic material 8a, impact energy such as earthquake is absorbed by the non-linear behavior associated with the load history. That is, when tension is applied to the cable member 2, the bearing plate 5 hardly deforms, whereas the shock absorbing plate 6 is bent and deformed, and the volume of the gap 18 is reduced. Due to the decrease in volume, the plate-like viscoelastic material 8a undergoes plastic deformation under the compressive stress C. Furthermore, the plate-like viscoelastic material 8a absorbs the impact energy generated in the cable material 2 due to the earthquake, and the vibration and deformation of the structure are reduced and the damage to the structure is reduced by the repeated load caused by the earthquake motion. Let The gap 18 between the pressure bearing plate 5 and the shock absorbing plate 6 only needs to have a space in which the shock absorbing plate 6 can be deformed. Further, the plate-like viscoelastic material 8a has a plate shape with a small thickness with respect to the length, and the amount of the plate-like viscoelastic material 8a protruding to the end due to the compressive stress C is small. Therefore, it becomes possible to absorb the energy of seismic motion by compressive deformation.

  The cylindrical viscoelastic material 8 b receives a shear stress S due to a relative displacement between the cable material 2 and the bearing plate 5. That is, the cable member 2 is displaced from the bearing plate 5 due to the deformation of the shock absorbing plate 6 and the displacement due to the extension of the cable member 2 itself due to the tensile force F. Since the bearing plate 5 is fixed, a shearing force S is generated in the cylindrical viscoelastic material 8b. As described above, when stress is applied to the cylindrical viscoelastic material 8b, impact energy such as earthquake is absorbed by the non-linear behavior associated with the load history. When the repeated load due to the earthquake motion acts, the cylindrical viscoelastic material 8b absorbs impact energy generated in the cable material 2 due to the earthquake, reduces shaking and deformation of the structure, and reduces damage to the structure. The gap 19 between the cable member 2 and the bearing plate 5 is a clearance for allowing the cable member 2 to pass through the cable opening 15 of the bearing plate 5. This clearance absorbs the rotational movement of the cable material 2 with the contact point between the socket 3 and the shock absorbing plate 6 as a fulcrum when the cable material 2 is in an earthquake or a strong wind. Therefore, the shear shear stress S due to the rotation generated in the cable material 2 may occur.

  FIG. 7 shows a schematic configuration of one embodiment of a tension member 20 with a tension member fixture according to the present invention. Fig.7 (a) is a front view, FIG.7 (b) is the side view seen from the AA direction. In the present embodiment, the tension member 20 with the tension member fixture is the cable member 2 with the tension member fixture that connects the wooden column member 11 and the foundation concrete 12.

  As shown in FIG. 7B, the wooden column 11 and the foundation concrete 12 generally have a step. As a reinforcing material for connecting the column member 11 and the foundation concrete 12, a tensile member 20 with a fixing member for a tensile member using the flexibility of the cable member 2 is used. In the present embodiment, the tension member fixture 1 is used as a fixing means to the foundation concrete 12. The tension member fixture 1 may be used as a fixing means to the pillar material 11 or may be used as a fixing means to both the pillar material 11 and the foundation concrete 12.

  The tension member 20 with a fixing member for a tension member connects the column material 11 and the foundation concrete 12 as earthquake-proof reinforcement of a wooden structure, and prevents the column material 11 from being pulled out during an earthquake. On the column member 11 side, the socket 3 at the end of the cable member 2 is directly attached to the fixing plate 14, and the fixing plate 14 is fixed to the column member 11 with bolts 17. The material of the socket 3 is welded to the fixed plate 14 by welding steel (low carbon steel). When the material of the socket 3 is a zinc-copper alloy or the like and is difficult to weld, the tension member fixture 1 may be used. The cable member 2 absorbs a step between the column member 11 and the foundation concrete 12 and is fixed to the foundation concrete 12 by the tension member fixture 1 on the foundation concrete 12 side.

  A method of attaching the tension member 20 with the tension member fixture in the present embodiment will be described. First, the cable member 2 to which the socket 13 and the socket 3 are attached is prepared. The cable material 2 is obtained by cutting a structural strand rope into a predetermined length in advance and attaching sockets 3 and 13 to both ends. Next, the fixing plate 14 is attached to the socket 13 side, the tension member fixture 1 is attached to the socket 3 side, and the tension member 20 with the tension member fixture is obtained. Next, the fixing plate 14 to which the socket 13 is attached is fixed to the pillar material 11 at a predetermined position by a bolt 17. Next, the fixing plate 4 to which the socket 3 is attached is fixed with a bolt 7 at a predetermined position in consideration of introduction of initial tension. At that time, the shock absorbing plate 6 is removed because it is inserted into a predetermined position when the tension is introduced. Furthermore, initial tension is introduced into the cable member 2 using a jig such as a ram chair. When the cable member 2 has a small diameter, the fixing plate 4 may be pulled downward when the bolt 7 is fixed, and the cable member 2 may be fixed to the column member 11 by applying an initial tension.

  FIG. 8 illustrates an example of a method for introducing an initial tension to a tension member with a fixture according to the present embodiment. A ram chair 21, a threaded tension bar 22, and a nut 23 that engages with the tension bar 22 are used as a jig for introducing tension. The ram chair 21 is a reaction force table attached to a part of the bearing plate 5. A tension bar attaching port 25 is provided at the end of the socket 3, and one end of the tension bar 22 is attached to the socket 3. The other end of the tension bar 22 passes through the ram chair 21 and engages with the nut 23. The initial tension is introduced by rotating the nut 23 while taking the reaction force from the ram chair 21 and pulling the socket 3 by the tension bar 22. The initial tension to be introduced can be managed by the number of rotations of the nut 23. Further, the management of the initial tension may be a method of visually checking the amount of swelling d of the impact absorbing plate 6 described above. That is, the initial tension is introduced by the rotation of the nut 23, and the shock absorbing plate 6 is a substantially flat plate to confirm that a predetermined initial tension is introduced. Due to the rotation of the nut 23, a gap is generated between the bearing plate 5 and the socket 3, and the shock absorbing plate 6 is inserted into the gap. When this gap is equal to or greater than the thickness of the shock absorbing plate 6, the shim plate 24 is inserted between the bearing plate 5 and the shock absorbing plate 6 to adjust the interval.

  In the present embodiment, the method of introducing the initial tension of the tension member 20 with the tension member fixing member is a method of rotating the nut 23 to retract the socket 3, but other methods may be used. For example, there is a method of managing tension by hydraulic pressure using a center hole jack. In the case of a simple tension member 20 with a tension member fixing member, the initial tension may be introduced manually.

It is the front view, side view, and bottom view which show the schematic structure of one embodiment of the fixture for tension members concerning the present invention. It is the front view and sectional drawing which show the schematic structure of other embodiment of a bearing plate. It is sectional drawing which shows the schematic structure of embodiment of an impact-absorbing board. It is a front view which shows the schematic structure of other embodiment of an impact-absorbing board. It is sectional drawing which shows the schematic structure of other embodiment of a bearing plate. It is the perspective view explaining the schematic structure of the viscoelastic material. It is the front view and side view which show the outline structure of one embodiment of the tension member with a fixing member for tension members concerning the present invention. It is a front view showing the outline composition of an example of the introduction method of the initial tension of the tension member with a fixture.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Fixing tool for tension members, 2 Cable material, 3,13 Socket, 4,14 Fixing plate, 5 Bearing plate, 5a Top plate, 5b Side plate, 5c Reinforcement plate, 5d Bottom plate, 5e Curved plate, 5f Cylindrical plate, 6 Shock absorber plate, 7, 17 bolt, 8 viscoelastic material, 8a plate viscoelastic material, 8b cylindrical viscoelastic material, 9 structure, 10 tension member, 11 pillar material, 12 foundation concrete, 15 cable opening of bearing plate 15a, cable opening of side plate, 15b cable opening of curved plate, 16 bearing surface, 18 gap between bearing plate and shock absorbing plate, 19 gap between cable material and bearing plate, 20 for tension member Tensile member with fixture, 21 Ram chair, 22 Tension bar, 23 Nut, 24 Shim plate, 25 Tension bar mounting port, F Tensile force, F ₀ initial tension, C Compressive stress, P, Q Support line, R edge, D Peeled d Mukuri amount, S shear stress.

Claims (9)

A tension member fixture for fixing a tension member composed of a tension member and sockets at both ends thereof to a structure of a building by grasping the socket,
A fixing plate fixed to the structure and attached;
A support plate provided on the fixed plate, in contact with the outer periphery of the shock absorbing plate, and having an opening through which the tensile material passes;
An impact absorbing plate provided between the socket and the bearing plate and capable of bending deformation due to stress generated in the tensile material;
A fixture for a tension member, characterized in that there is a gap between the impact absorbing plate and the bearing plate that allows the impact absorbing plate to bend and deform.   2. The tension member fixture according to claim 1, wherein the impact absorbing plate is made of low yield point steel and is replaceable.   The tension member fixture according to claim 1 or 2, wherein a viscoelastic material is provided in a gap between the impact absorbing plate and the bearing plate.   The tension member fixture according to claim 1 or 3, wherein a viscoelastic material is provided in a gap between the tension member and the bearing plate.   The tension member fixture according to any one of claims 1 to 4, wherein the shock absorbing plate stands on the socket side.   6. The tension member fixture according to claim 5, wherein the impact absorbing plate is erected so as to become a substantially flat plate by introducing an initial tension to the tensile material.   The tension member fixture according to any one of claims 1 to 6, wherein the bearing plate has a cylindrical concave surface facing the shock absorbing plate.   The tension member fixture according to any one of claims 1 to 6, wherein the bearing plate has a spherical concave surface facing the shock absorbing plate. The tension member with which the fixture for tension members of any one of Claims 1 thru | or 8 was mounted | worn.

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