JP4319066B2 - Fixing device and fixing structure for tension member for reinforcing structural member - Google Patents

Description

  The present invention relates to a fixing device for a tension member for reinforcing a structural member that fixes a tension member used to reinforce a structural member such as a concrete member or a steel member by introducing prestress into the structural member after tensioning, and It relates to a fixing structure.

  For example, as a method to reinforce concrete members such as existing bridge girders, floor slabs, or building beams against tensile force, steel bars such as reinforcing bars are placed along the concrete members, and concrete or mortar is added to the concrete. There is a method of embedding steel in concrete, mortar, etc., but this method increases the amount of concrete and so on, so there are cases where the adhesion of existing concrete members to the concrete may not be sufficient. Punched concrete or mortar may be pulled away by the peeling of the reinforcing material.

  On the other hand, according to the method in which the FRP sheet is bonded to the concrete member and tensioned, there is no increase in the concrete and the like, so there is no problem of peeling of the concrete, and a closing effect after the occurrence of cracking can be expected. There is an advantage that the stress state in the cross section of the concrete member can be intentionally modified by adjusting the tension force to be applied, and an advantage that the original shape of the existing concrete member can be kept intact.

Therefore, the applicants are arranged along the concrete member with a tension member that solves the problem of peeling of the concrete while exhibiting the same prestress introduction effect as the method using the FRP sheet or the like (see Patent Document 1). The tension device suitable for the tension material is proposed first (see Patent Document 2).
Japanese Patent Laid-Open No. 2002-97746 JP 2003-328561 A

  The tension device of Patent Document 2 includes a fixing device fixed to a concrete member, a reaction force frame fixed to the fixing device, and a jack that introduces tension to the tension material while taking a reaction force on the reaction force frame. In this case, in order to make a portion (intermediate portion) other than the end portion of the tendon material in close contact with the surface of the concrete member, it is basically necessary to form a notch at the arrangement position of the fixing device. Adhering the intermediate portion of the tendon to the surface of the concrete member is necessary for adhering the tendon to the concrete member using an adhesive without increasing the concrete or the like.

  It is not always necessary to form a notch for the fixing device when placing the intermediate part of the tendon in concrete or mortar which is increased against the surface of the concrete member. There is a possibility that the concrete or the like that has been removed is pulled by the peeling of the reinforcing material.

  In order to form a notch in an existing concrete member, it is necessary to beat the concrete from the surface side. However, if the cover thickness of the concrete is not sufficient, as a result of forming the notch, the durability of the reinforcing bar and the concrete The strength of the concrete member may be reduced and the strength and rigidity of the concrete member may be reduced.

  Even if the cover thickness is sufficient in the existing state, if a notch is formed and a sufficient cover thickness is not secured to the notch surface when a part of the tensioning device is embedded in this, as a result, Since it is equivalent to the case where the cover thickness is not sufficient, there is a possibility that the strength and rigidity of the concrete member will be lowered, and the notch cannot be formed.

  In order to avoid the above-mentioned peeling due to the increase in the concrete, it is necessary to fill the concrete member with a groove on the surface of the concrete member, but the groove cannot be formed unless the cover thickness is sufficient. In that case, it is necessary to fix the fixing device to the concrete member without forming a notch in the concrete member. As a result, in the concrete etc. where the intermediate portion of the tension material stretched between the fixing devices is increased. It must be buried in

  In view of the above background, the present invention proposes a fixing device for a tendon that does not require the formation of a notch in the concrete member while maintaining a state in which the intermediate portion of the tendon is in close contact with the surface of the concrete member.

  According to claim 1, the center side deflector is disposed at least at one position between the fixing devices on both sides which are fixed to the surface of a structural member such as a concrete member or a steel member and to which the end of the tendon is fixed. The formation of a notch in the concrete member is made unnecessary while maintaining the state in which the intermediate part of the tendon is in close contact with the surface of the concrete member.

  The fixing device has an insertion hole and a fixing device that is fixed to the surface of the structural member at the position of the fixing tool integrated with the end portion of the tension member, and also has an insertion hole and faces the tension direction of the tension member. The fixing tool integrated with the end of the tension member and the insertion holes of the fixing device are inserted, and the fixing rod connected to the fixing tool and the surface of the structural member at the intermediate portion excluding both ends of the tension member The center part side deflection tool which is fixed, contacts the tendon on the back side, and inclines the section from the intermediate part of the tendon to the fixing device with respect to the surface of the structural member.

  At least one center-side deflector is fixed to the structural member near the center of the tendon, and the tendon is brought into contact with the back surface thereof, so that the tendon spans the section from the center-side deflector to the fixing device. It is installed inclining with respect to the surface of the structural member. The middle part of the tendon is at the position of the center side deflector (when there is one center part side deflector), or in a section other than the section from the center part deflector to the fixing device (center side). When there are a plurality of deflecting tools, they are placed in a state where they can adhere to the surface of the structural member.

  The tension material is inclined and spanned from the center side deflector to the fixing device, so that the tension material is in close contact with the structural member at the position of the center side deflector (the center side deflector is 1). The tension member is fixed while the sections other than the section from the central deflector to the fixing device are in close contact with the structural member (when there are a plurality of central deflectors). Since the distance between the tension material and the surface of the structural member can be secured at the position of the fixing device, the fixing device can be fixed in contact with the surface of the structural member, and the structural member is a concrete member. In some cases, it is not necessary to form notches in the structural member.

  As a result, if the structural member is an existing concrete member and the cover thickness is not sufficient, the durability and adhesion of the reinforcing bar will not be affected. The fixing device can be fixed to the steel member that cannot be formed using bolts or the like.

  When the tension material is inclined in the section from the center side deflector to the fixing device, the tension material is separated from the structural member in the section, and prestress due to the tension force of the tension material is not continuously transmitted to the structural member. However, as described in claim 6, the separation by the inclination is at least a filler such as an adhesive or mortar between the back surface of the section where the tension material is inclined with respect to the surface of the structural member and the surface of the structural member. Since it is avoided by filling and attaching the tendon to the structural member, the effect of continuously introducing prestress into the structural member is maintained.

In addition, when a fixing device having an end-side deflector is used, an adhesive, mortar, or the like is also applied to the section from the end-side deflector to the fixing device where the tension material is parallel to the surface of the structural member. The filler is filled and attached to the structural member.

  Since the above-described position of the deflector at the center portion of the tendon, or a section other than the section in which the tendon is tilted with respect to the surface of the structural member is in a state where it can be in close contact with the surface of the structural member, By filling the tension member and the surface of the structural member with a filler such as an adhesive or mortar, the tension member is brought into close contact with the surface of the structural member over the entire length of the section excluding both ends integrated with the fixing tool. Therefore, the problem of delamination when the tension material is adhered to the structural member by increasing the concrete or mortar is avoided.

  When the central part side deflector is disposed only at one position between the fixing devices on both sides, the sections on both sides of the central part side deflector are inclined, and the tension material is separated from the structural member in that section. However, also in this case, the separated state is obtained by filling a filler such as an adhesive or mortar between the rear surface of the separated section and the surface of the structural member as in claim 6 and attaching the tension material to the structural member. It will be resolved.

  In particular, when two center-side deflectors are arranged at two locations in the middle portion excluding both ends of the tendon as described in claim 2, the section between the two center-side deflectors is structured. Since it can be in close contact with the surface of the structural member in a state parallel to the surface of the member, the section can be adhered to the surface of the structural member using a filler such as an adhesive, resulting in an increase in concrete or mortar. No hitting is required, and the problem of peeling due to extra hits is avoided.

  When the tension material is inclined only by the center side deflector, the tension force introduced by the tension device (jack) may be slightly lost because the tension material remains inclined even at the position of the fixing device.

Also, the end side deflector that contacts the tension material on the surface side near the tension material fixing device and corrects the section to the tension material fixing device in parallel with the surface of the structural member is fixed to the surface of the structural member. For example, the section of the tension material inclined from the center side deflector to the end side deflector can be parallel to the surface of the structural member from the end side deflector to the fixing device. It becomes possible to avoid the loss of tension due to the inclination.

  Further, when the tension force to be introduced into the tension member at the contact portion with the central side deflector on which the tension member is deflected in claims 1 and 2 may be lost due to frictional force, the method according to claim 3 As described, the loss of tension due to the frictional force is reduced by adhering the low friction material to the back surface of the center side deflector.

Further, if the tension should tendons are introduced into tendons at the contact portion between the central portion side deflecting device and the end-side deflection tool is deflected there is a possibility that loss due to friction forces claim 3 As described above, the low friction material is bonded to the back surface of the center side deflector and the surface of the end side deflector.

Further, by provoking tilt (deflected) by the tendons central side deflecting device, by provoking tilt (deflected) by the tendons central side deflecting device and the end-side deflection device, in the direction of introduction of the tensioning force The loss of tension due to tilting can be considered, but from the experimental results shown in Table 1, the amount of tension loss due to deflection is very small and falls within a range that does not affect the introduction of prestress to the structural member. It has been confirmed.

  In Table 1, a deflection angle of 0 ° indicates that the tension member 7 is not deflected, and a deflection angle of 0.68 ° indicates that the tension member 7 is deflected only by the central deflector 5 as shown in FIG. In the case of Item 2, in the case where L1 in FIG. 1 is 2370 mm and h1 is 28 mm, the deflection angle is 0.89 ° by using the central side deflector 5 and the end side deflector 6 as shown in FIG. FIG. 2 shows a case where L2 in FIG. 2 is 1800 mm and h2 is 28 mm.

  In the case of claim 1 and claim 2, as shown in FIG. 1, the deflection angle of the tension member 7 deflected by the central portion side deflector 5 is the fixing device on the side to which the tension force is applied from the central portion side deflector 5. 3 and the distance h1 from the surface of the structural member 1 to the exposed position of the tension member 7 of the fixing tool 8 fixed to the fixing device 3.

Further, as shown in FIG. 2, the distance L2 from the center side deflecting tool 5 to the end side deflecting tool 6, the distance h2 from the surface of the structural member 1 to the surface of the end side deflecting tool 6, and the center side deflecting tool 5 Although it is determined by the difference of the distance h3 to the back (h2−h3), L1 and L2 are about 1000mm to several thousand mm, whereas h1 and h2−h3 are extremely small, 10mm to several 10mm. The deflection angle can be set to less than 1 °, which is within a range that does not affect the introduction of prestress.

The amount of tension loss when the deflection angle is 1 ° is T (1-cos 1 °) as TMPa (N / mm ² ) as the tension applied to the tendon, so 1.5 × 10 ^{−4 of the} tension. If the deflection angle is less than 1 °, it can be seen that the amount of loss remains within the range that does not affect the prestress.

The tensioning member is in a state of being tensioned with respect to the fixing device as described in claim 4 , and by connecting a fixing rod that passes through the insertion holes of the fixing device and the fixing device to the fixing device and the fixing device. It is fixed.

  Parts other than the fixing device, that is, at least the section where the tension material is inclined with respect to the surface of the structural member, are filled with a filler such as an adhesive between the back surface of the tension material and the surface of the structural member. It adheres and the integrity with the structural member is ensured. As described above, a filler such as an adhesive is filled in the section from the end side deflector to the fixing device where the tension material is parallel to the surface of the structural member.

  The position of the central deflector that is parallel to the surface of the structural member other than the section from the central deflector to the fixing device, or the section other than the section from the central deflector to the fixing device of the tension material Since it exists in the state which can be closely_contact | adhered to the surface, it is made to adhere to the structural member surface with fillers, such as an adhesive agent.

  By ensuring the integrity of the tendon and the structural member, the tension force introduced into the tendon is not lost, and acts on the structural member continuously as a prestress in the construction section of the tendon. In addition, since it is not necessary to increase the amount of concrete or the like on the surface of the structural member, occurrence of peeling due to a cold joint can be avoided.

  According to the first aspect of the present invention, the tension member is deflected at the center portion side by disposing a center-side deflector that contacts the tension material on the back side at least at one position between the fixing devices on both sides to which the end portions of the tension material are fixed. Inclined with respect to the surface of the structural member over the section from the implement to the fixing device, and secure a distance between the tension material and the surface of the structural member at the position of the fixing device where the tension material is fixed. Therefore, when the structural member is a concrete member, it is not necessary to form a notch in the structural member.

  As a result, when the structural member is an existing concrete member, it does not affect the durability and adhesion of the reinforcing bar, so that the strength and rigidity of the structural member are not reduced, and it is impossible to form a notch. It is possible to fix the fixing device to possible steel members.

  According to claim 2, the central portion side deflecting tool is disposed at two positions of the intermediate portion excluding both end portions of the tendon material, so that the sections other than the inclined section are in close contact with the surface of the structural member in parallel. It is possible to attach the sections other than the inclined sections to the surface of the structural member using an adhesive or the like, so that it is not necessary to increase the concrete or mortar, and the problem of peeling due to the increased hit is avoided. Can do.

  According to the third aspect of the present invention, since the low friction material is adhered to the back surface of the center side deflecting tool, loss of tension force due to frictional force at the contact portion between the tension material and the center side deflecting tool can be reduced.

In addition, by fixing the end side deflector, which is in contact with the tension material on the surface side, close to the tension material fixing device and corrects the section to the tension material fixing device in parallel with the surface of the structural member, to the structural member. The section of the tension material inclined from the center side deflector to the end side deflector can be parallel to the structural member surface from the end side deflector to the fixing device. Loss of tension due to tilting can be avoided.

According to the third aspect of the present invention , the low friction material is bonded to the back surface of the center side deflecting tool and the surface of the end side deflecting tool. Loss of tension can be reduced.

According to the fourth aspect of the present invention, a portion other than the fixing device is filled with a filler between the back surface of the tension member and the surface of the structural member, and the tension member is attached to the structural member to ensure the integrity with the structural member. It is possible to cause the structural member to continuously act as prestress in the construction section of the tension material without losing the tension force introduced into the material. Further, since it is not necessary to increase the amount of concrete or the like on the surface of the structural member, the occurrence of peeling due to a cold joint can be avoided.

  The fixing device 2 according to the first aspect of the present invention has an insertion hole 3 c as shown in FIG. 1, and a fixing device 3 fixed to the surface of the structural member 1 to be reinforced, along the surface of the structural member 1. The fixing tool 8 that is disposed and has the insertion hole 8b faces the tensioning direction of the tension member 7 integrated at the end portion, and passes through the fixing tool 8 and the insertion holes 3c and 8b of the fixing device 3, and passes through the fixing tool 8. The fixing rod 4 to be connected and the intermediate portion excluding both ends of the tension member 7 are fixed to the surface of the structural member 1, contact the tension member 7 on the back side, and the fixing device 3 from the intermediate portion of the tension member 7. It is comprised from the at least 1 center part side deflection | deviation tool 5 which inclines the area until to the surface of the structural member 1. FIG. The fixing device 2 is fixed to the structural member 1 at the position of the fixing tool 8 at the end of the tendon 7.

  In the fixing device 2 according to the second aspect of the present invention, the center-side deflecting tool 5 is particularly disposed at two positions in the middle portion excluding both ends of the tendon material 7, and the tension material 7 is disposed at the two center-portion deflecting tools 5. This is a case where it can be installed in parallel with the surface of the structural member 1 between the five members.

  In addition to the fixing device 2 of claim 2, the fixing device 2 is fixed to the surface of the structural member 1 near the fixing device 3 of the tension material 7, and contacts the tension material 7 on the surface side, as shown in FIG. The tension member 7 is composed of an end-side deflecting tool 6 that corrects the section from the center-side deflecting tool 5 to the fixing device 3 in parallel to the surface of the structural member 1.

  The surface of the structural member 1 refers to a surface on the side where the tension member 7 is disposed with respect to the structural member 1, and includes a side surface and an upper surface in addition to the lower surface of the structural member 1 as illustrated. Further, the back surface of the center side deflector 5 with which the tension material 7 contacts in claims 1, 2, and 4 refers to the surface on the surface side of the structural member 1, and the tension material 7 contacts in claim 4. The surface of the end-side deflector 6 is the surface opposite to the surface of the structural member 1.

  The structural member 1 is made of reinforced concrete including SRC, precast concrete, or steel, which is reinforced against bending moment mainly by introducing prestress in the direction of the material axis such as bridge girder, floor slab, or building beam. It is a made member, and there are cases where it is an existing case and a case where it is newly established.

  A plate such as a flat bar or plate (steel plate) having a thickness of about 10 mm to several tens of mm is used for the center side deflector 5 and the end side deflector 6, and the tension material within the contact surface with the tension material 7 is used. The portion for deflecting 7 is formed into a convex curved surface on the side of the tendon 7 so that the curvature of the tendon 7 gradually changes in order to avoid the action of local stress on the tendon 7. When the frictional force on the contact surface with the tension material 7 may affect the tension force, the low friction material 5a, 6a such as stainless steel or tetrafluoroethylene sheet is bonded to the contact surface with the tension material 7 And loss of tension is avoided (claims 3 and 5).

  The center-side deflector 5 and the end-side deflector 6 are fixed in close contact with the surface of the structural member 1, and are anchor bolts or the like in the case of a new concrete member, and bolts or the like in the case of a steel member. In the case of an existing concrete member, it is fixed by anchor bolts or the like in the manner of post-construction anchor, and in the case of an existing steel member, it is fixed by bolt welding or the like.

  The center side deflecting tool 5 is disposed at an arbitrary position in the section excluding the fixing tools 8, 8 on both sides of the tension member 7, and the end side deflecting tool 6 is provided with the center side deflecting tool 5 and the side to which tension is applied. It is arranged at an arbitrary position between the fixing device 8.

  Of the fixing devices 8 and 8 on both sides of the tension member 7, the fixing device 3 to which the fixing device 8 on the side fixed prior to the structural member 1 is fixed is not equipped with a tension device (jack 10). The fixing device 3 that receives the fixing tool 8 on the side (right side) to be fixed prior to the structural member 1 in FIG. 1 and FIG. The fixing device 3 that receives the fixing device 8 on the side to which the tension force is applied (left side) is made thinner, and the exposed position of the tension material 7 from the fixing device 8 is brought close to the surface of the structural member 1. In some cases, the devices 3 and 3 have the same thickness, and the exposed position of the tension member 7 from the fixing tool 8 is the same distance from the surface of the structural member 1.

  In FIG. 1, one central deflector 5 is arranged between the fixing devices 3 on both sides, and in FIG. 2, the central deflector 5 and the end deflector 6 are arranged one by one. However, when the thicknesses of the fixing devices 3 and 3 on both sides are the same, two center-side deflectors 5 and two end-side deflectors 6 are arranged symmetrically with respect to the longitudinal center of the tension member 7. Sometimes.

  In addition to reinforcing bars, flat bars, and PC steel materials, the tension material 7 is impregnated with resin material into glass, graphite, aramid, or metal fibers and cured to form a fiber-reinforced material formed into a rod, plate, or strip. Is used.

  As shown in FIG. 5, the fixing tool 8 surrounds the end of the tension member 7, and the fixing tool 8 is filled with an epoxy resin-based adhesive or other non-shrinkable mortar filler 9. By this, it is integrated with the tendon material 7 by the adhesive force. When the tension material 7 is a steel material, it may be integrated with the tension material 7 by a wedge or nut fixing method instead of the filler 9 by a wedge fixing or nut fixing method.

  As shown in FIGS. 5 and 9- (b), the fixing tool 8 has a fixing nut 8c for fixing the fixing tool 8 itself to the fixing bar 4 inserted through the fixing device 3 on both sides of the tension member 7. Each of the locked portions 8a is formed with an insertion hole 8b through which the fixing bar 4 is freely movably inserted in the axial direction.

  The locked portions 8a and 8a receive the tension force from the jack 10 via the fixing nuts 8c and 8c that are screwed to the fixing rod 4 on which the tension force of the jack 10 that introduces tension to the tension member 7 directly acts. Therefore, the shapes of the locked portions 8 a and 8 a on both sides are formed symmetrically with respect to the center of the tension member 7, and both the insertion holes 8 b and 8 b are disposed at symmetrical positions with respect to the center of the tension member 7.

  As shown in FIG. 4, the tension material 7 is fixed to the fixing device 3 constituting the fixing device 2 in the fixing tool 8 integrated at both ends, and at least a part of the tension material 7 excluding the fixing tool 8 ( For example, as shown in FIG. 6, the intermediate portion of the tension member 7 is attached to the surface of the structural member 1 by an epoxy resin-based adhesive 12 or other mortar, or a mortar containing an adhesive. In the drawing, since the tension member 7 is disposed on the lower surface side of the structural member 1, the surface of the structural member 1 is the lower surface, but depending on the portion of the structural member 1, there may be a side surface or an upper surface.

  FIG. 7 shows an anchor bolt-like restraining material 13 and restraining plate 14 fixed to the structural member 1 for the purpose of suppressing the occurrence of sag at the intermediate portion of the tension member 7 formed in a flat plate shape or a belt shape as will be described later. The case where the intermediate part of the tendon material 7 is hold | maintained is shown. When the tension material 7 is attached to the structural member 1 with the adhesive 12 or the like as shown in FIG. 6, it is not always necessary to use the restraining material 13 and the restraining plate 14, but it is used to supplement the adhesion due to the adhesive 12 or the like. There is also. 7A shows a cross section orthogonal to the axial direction of the tendon 7 and FIG. 7B shows a cross section orthogonal to (a).

  When the structural member 1 is an existing concrete member, the constraining member 13 is drilled in the manner of a post-construction anchor, and is inserted after filling a filler 19 such as mortar or adhesive into the hole. It is inserted into the formed hole directly or into an embedded metal fitting such as a cap nut embedded in the hole and fixed by the filler 19. The structural member 1 made of steel is fixed by, for example, a bolt penetrating the structural member 1.

  As shown in FIG. 8 (b), the fixing device 3 includes a connection portion 3a through which the fixing bar 4 is inserted and connected, and fixing portions 3b and 3b fixed to the structural member 1 on both sides thereof. As shown in (a), the structural member 1 of the concrete member is drilled, for example, in the manner of a post-installed anchor, and after filling the filler 19 in the hole, it penetrates the fixing portions 3b and 3b. The anchor bolt 15 to be inserted is inserted and fixed. The structural member 1 made of steel is fixed by, for example, a bolt penetrating the structural member 1 and the fixing portion 3b. In order to prevent the rebar from being exposed when drilling an existing concrete member, the position of the rebar is accurately grasped using a radar or the like.

  Insertion holes 3c and 3c for inserting a plurality of fixing rods 4 in the tension direction of the tension member 7 are formed in the connection portion 3a of the fixing device 3, and the fixing rods 4 are inserted into the insertion holes 3c and 3c. 4 is freely movably inserted.

  A fixing nut 4a for fixing the fixing rod 4 to the connecting portion 3a of the fixing device 3 after the tensioning member 7 is tensioned by the jack 10 is screwed to the fixing rod 4 on the opposite side of the fixing tool 8. Yes. The fixing bar 4 is made of a steel bar having a cross section that can be inserted into the insertion hole 3c of the connecting portion 3a of the fixing device 3, and at least the fixing nut 4a and the fixing nut 8c are threaded. A threaded portion 4b is formed.

  The fixing portion 3b of the fixing device 3 is provided with a bolt hole 3d through which the anchor bolt 15 is inserted and a screw hole 3e through which a screw 16 such as a bolt for fixing the jack fixing block 11 to the fixing device 3 is inserted. The fixing device 3 has a symmetrical shape with respect to the center of the tendon 7, and the fixing bar 4 is evenly arranged with respect to the center of the tendon 7.

  The fixing unit 3b of the fixing device 3 also has bolts for fixing a deformation restraining plate 17 additionally used to prevent the fixing bar 4 from being bent when a sag is generated in the tension member 7. The screw hole 3f through which the screw 18 is inserted is opened.

  As described above, the tension introducing work to the tension member 7 is performed in the state where one of the fixing tools 8 and 8 integrated at both ends is fixed to the fixing device 3 fixed at the position. In this manner, the other fixing tool 8 is pulled using the jack 10.

  As shown in FIG. 8, with the fixing device 3 fixed to the structural member 1 with the anchor bolt 15, the fixing bars 4 and 4 are inserted into the insertion holes 8b and 8b of the fixing tool 8 as shown in FIG. As a result, the fixing tool 8 is attached to the fixing rods 4 and 4 and the fixing nuts 8c and 8c are screwed into the screw portions 3b and 3b of the fixing rods 4 and 4 from the tension member 7 side of the locked portion 8a. As a result, the fixing tool 8 is connected to the fixing bars 4 and 4.

  As described above, at least the fixing nut 8c portion and the fixing nut 4a portion of the fixing rod 4 shown in FIG. 9 are formed with the screw portion 4b, and the fixing nut 8c is the screw portion 4b in the state of FIG. The fixing nut 4a can be moved to the connecting portion 3a side of the fixing device 3 together with the fixing rod 4 and the fixing tool 8 when the tension force by the jack 10 is introduced, and the fixing nut 4a is screwed to the fixing rod 4. It moves together with the movement of the fixing bar 4 by the jack 10 while being joined.

  When the intermediate part of the tension member 7 is attached to the structural member 1 using an adhesive 12 or the like as shown in FIG. 6, it is bonded to the tension member 7 with the fixing rod 4 inserted through the fixing tool 8. Agent 12 or the like is applied.

  After the fixing tool 8 is mounted on the fixing rod 4, the jack fixing block 11 is attached to the fixing device 3 by screws 16 such as bolts screwed into the screw holes 3 e of the fixing portion 3 b of the fixing device 3 as shown in FIG. 10. Then, the jack 10 is attached to the jack fixing block 11 as shown in FIG. The jack 10 is disposed on the opposite side of the fixing tool 8 with respect to the jack fixing block 11.

  As shown in FIGS. 11 to 13, the jack 10 includes a shaft portion 10a having a small diameter portion 10b, and an expansion / contraction portion 10c that expands and contracts with respect to the shaft portion 10a. The expansion / contraction portion 10c includes a fixing nut 4a of the fixing rod 4. A locking portion 10d that locks to the opposite side of the tension material 7 is formed on the tension nut 4c that is screwed toward the end on the side.

  As shown in FIG. 15, the jack fixing block 11 has a mounting portion 11 a that overlaps the fixing portion 3 b of the fixing device 3 and a shaft portion 10 a of the jack 10 that is locked to the tension material 7 side, and bears the reaction force of the jack 10. The small diameter portion 10b of the shaft portion 10a is inserted into the reaction force receiving portion 11b, and an insertion portion 11c for stably holding the shaft portion 10a is formed. The jack fixing block 11 transmits the reaction force of the jack 10 received by the reaction force receiving portion 11 b to the fixing device 3 and transmits it to the structural member 1 through the anchor bolt 15.

  As shown in FIG. 11, the tension nut 4c is positioned on the opposite side of the tension member 7 with respect to the fixing nut 4a. The jack 10 has the small diameter portion 10b inserted into the insertion portion 11c of the jack fixing block 11, and the locking portion 10d is tensioned. The nut 4c is locked to the opposite side of the tension member 7, and is attached to the jack fixing block 11 while being sandwiched between the tension nut 4c and the fixing nut 4a.

  The locking portion 10d of the jack 10 has a through hole 10e through which the fixing bar 4 is inserted in order to ensure stability when the fixing bar 4 is pushed out toward the tension nut 4c, and the through hole 5e is used for fixing. The bar 4 penetrates freely.

  In a state where the jack 10 is mounted on the jack fixing block 11, while the reaction force receiving portion 11b of the jack fixing block 11 takes a reaction force as shown in FIG. 12, the expansion / contraction portion 10c is extended, and the tension nut 4c is attached to the tension material 7 The tension is introduced into the tendon 7 by pushing it out to the opposite side.

  After confirming that a predetermined tension has been introduced to the tension member 7, the fixing rod 4 is attached to the fixing device 3 by fastening the fixing nut 4a to the connecting portion 3a of the fixing device 3 as shown in FIG. At the same time, fixing of the tendon 7 to the fixing device 3 is once completed.

  Subsequently, when tension is applied to the tension member 7, the fixing rod 4 is fixed to the fixing device 3 by tightening the fixing nut 4a, and the expansion / contraction portion 10c is further extended, and the fixing portion 10d is used as the fixing rod. By pushing the material 4 toward the tension nut 4c, the re-straining tension on the tension material 7 is performed.

  In this case, after the introduction of the tension to the tension member 7 is completed, the fixing nut 4a separated from the fixing device 3 is fastened again, whereby the fixing of the tension member 7 to the fixing device 3 is completed. 4 and the fixing device 3 are fixed to the structural member 1 via the fixing device 3.

  After the fixing of the fixing device 8 is completed, the jack 10 and the jack fixing block 11 are removed as shown in FIG. Since the fixing tool 8 maintains the fixing state to the structural member 1 by the fixing bar 4 and the fixing device 3, the fixing bar 4 and the fixing device 3 are subjected to rust prevention treatment. Further, as shown in FIG. 3B, the fixing bar 4, the fixing device 3, and the fixing tool 8 are covered with a protective cover 20 for rust prevention as required. When the protective cover 20 is put on, the fixing bar 4 and the fixing device 3 are rust-proofed by filling the protective cover 20 with mortar or the like.

  FIG. 12 shows contact with the lower surface of the fixing tool 8 connected to the fixing bar 4 in case the fixing bar 4 may be bent due to the occurrence of a sag due to the length of the tension member 7 being long. Then, the deformation restraining plate 17 that restrains the bending deformation of the fixing rod 4 is detachably connected to the fixing portion 3b of the fixing device 3, and the bending of the fixing rod 4 due to the sag of the tension member 7 is prevented. Shows the case. As described above, the deformation restraining plate 17 is detachably connected to the fixing portion 3b by the screw 18 such as a bolt screwed into the screw hole 3f formed in the fixing portion 3b of the fixing device 3.

  The deformation restraining plate 17 is used for the purpose of preventing bending deformation of the fixing bar 4 due to the occurrence of the sag of the tension member 7, but the tension force of the jack 10 is increased by the frictional force due to contact with the lower surface of the fixing tool 8. Since there is a possibility of an influence, the sag is recovered after the tension of the tension material 7 by the jack 10 is started.

  As shown in FIG. 6, the sag of the tension member 7 is adhered to the structural member 1 with an adhesive 12 or the like as shown in FIG. 6, or the restraint member 13 and the restraint plate 14 are used together as shown in FIG. In this case, the recovery time of the deformation restraining plate 17 can be advanced.

  FIG. 1 shows a case where the tension member 7 is fixed using the fixing device 2 according to the first or second aspect. FIGS. 2 and 3 show a case where the tension member 7 is fixed using the fixing device 2 according to the fourth aspect. Show the case.

  In the case of claim 1 or claim 2, the tension member 7 is inclined with respect to the surface of the structural member 1 in the section from the center side deflecting tool 5 to the fixing tool 8, and in the case of claim 4, in the center part side. It inclines in the section from the deflecting tool 5 to the end side deflecting tool 6.

  As shown in FIG. 3, an adhesive is provided between the rear surface of the section of the section exposed from the fixing tool 8 of the tension member 7 and the surface of the structural member 1 where at least the tension member 7 is inclined with respect to the surface of the structural member 1. A filler such as 12 or mortar is filled, and the tendon 7 is attached to the surface of the structural member 1 at least in the section. In FIG. 3, the section from the center side deflector 5 to the end section deflector 6 and the section from the end section deflector 6 to the fixing device 3 or the protective cover 20 are also filled with the adhesive 12 or the like. However, if the distance between the end-side deflector 6 and the fixing device 3 or the protective cover 20 is small, filling with the adhesive 12 or the like may be omitted.

  As described above, sections of the tendon member 7 other than the section from the central deflector 5 to the fixing device 3 or the protective cover 20 are attached to the structural member 1 by the adhesive 12 or the like as shown in FIGS. Be made.

It is the elevation which showed a mode that the tension material was fixed to the structural member using the fixing apparatus of Claim 1 or Claim 2. FIG. 5 is an elevational view showing a state in which a tendon is fixed to a structural member using the fixing device according to claim 4. (a) is the bottom view of the structural member which showed the area from the center part side deflection tool of FIG. 2 to a fixing device, (b) is an elevation view of (a). It is the top view which showed the relationship between the tension material with which the fixing tool was integrated, and the fixing device. (a) is the top view which showed a mode that the fixing tool was integrated in the edge part of a tendon, (b) is an end view of (a). It is sectional drawing orthogonal to the axial direction of the tension material which showed a mode that the intermediate part of the tension material was made to adhere to a concrete member using an adhesive agent. (a) is a cross-sectional view perpendicular to the axial direction showing a state where a middle part of a plate-like or belt-like tension material is brought into close contact with a concrete member by a restraining material and a restraining plate, and (b) is an orthogonal direction of (a). It is sectional drawing. (a) is sectional drawing parallel to the axial direction of the tension material which showed a mode that the fixing device was fixed to the concrete member, (b) is a top view of (a). (a) is a sectional view parallel to the axial direction of the tension member showing a state in which the fixing tool is connected to the fixing rod inserted through the fixing device, and (b) is a top view of (a). (a) is sectional drawing parallel to the axial direction of the tension material which showed a mode that the jack fixing block was fixed to the fixing device, (b) is a looking up view of (a). (a) is sectional drawing parallel to the axial direction of the tension material which showed a mode that the jack was mounted | worn with the jack fixing block, (b) is a look-up figure of (a). (a) is a sectional view parallel to the axial direction of the tendon showing the state when the deformation restraint plate is connected to the fixing device and the tendon is tensioned by the jack, and (b) is a top view of (a). . (a) is a sectional view parallel to the axial direction of the tendon showing the state when the deformation restraining plate is recovered and the tension is continued to be tensioned, and (b) is a top view of (a). (a) is a sectional view parallel to the axial direction of the tendon showing the state when the tension of the tendon is completed, and (b) is a top view of (a). It is an elevation view which showed a mode that the jack fixing block and the deformation | transformation restraint board were mounted | worn to the fixing device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Structural member, 2 ... Fixing device, 3 ... Fixing device, 3a ... Connection part, 3b ... Fixing part, 3c ... Insertion hole, 3d ... Bolt hole, 3e ... Screw hole, 3f ... ... screw holes,
4 ... Fixing bar, 4a ... Fixing nut, 4b ... Screw part, 4c ... Tension nut,
5 ... Center side deflector, 5a ... Low friction material, 6 ... End side deflector, 6a ... Low friction material,
7 ... tension material, 8 ... fixing material, 8a ... locked portion, 8b ... insertion hole, 8c ... fixing nut, 9 ... filling material,
10 ... Jack, 10a ... Shaft part, 10b ... Small diameter part, 10c ... Expandable part, 10d ... Locking part, 10e ... Through hole, 11 ... Jack fixing block, 11a ... Mounting part, 11b …… Reaction force receiving part, 11c …… Inserting part,
12 …… Adhesive, 13 …… Restraining material, 14 …… Restraining plate, 15 …… Anchor bolt, 16 …… Screw (for jack fixing block), 17 …… Deformation restraint plate, 18 …… Screw (deformation restraint plate) 19) Filler, 20 ... Protective cover.

Claims (4)

An apparatus for fixing a tension member, which is arranged along a surface of a structural member to be reinforced and has an insertion hole, to the surface of the structural member. The fixing device fixed to the surface of the structural member at the position of the fixing member, and the fixing member at the end of the tension member facing the tension direction of the tension member and the insertion holes of the fixing device, and connected to the fixing member and fixing bars, the surface of the structural member between the at least one of the central side deflecting member that is fixed to the surface of the structural member in the intermediate portion except the both end portions of the tension member, and the fixing device and the central portion side deflecting member The center side deflector contacts the tendon on the surface side of the structural member, and the section from the middle part of the tendon to the end side deflector It is inclined relative to the surface, frettage at the end side deflecting device to the surface side of the structural member opposite The fixing device of the structural member reinforcing tendon in contact with the wood are to be corrected in parallel section from the end side deflecting device of tendons to the fixed device with respect to the surface of the structural member.   The fixing device for a tension member for reinforcing a structural member according to claim 1, comprising two center-side deflectors, wherein the center-side deflectors are disposed at two positions in the middle portion excluding both ends of the tendon. The fixing device for a tension member for reinforcing a structural member according to claim 1 or 2 , wherein a low friction material is bonded to contact surfaces of the center side deflector and the end side deflector . A fixing structure of tendons with fixing device according to any one of claims 1 to 3, in a state in which tension the tendon, the fixing bars inserted through each insertion hole of the fixing device and the fixing device Are connected to the fixing device and the fixing device, and the tension material is filled between the surface side of the structural member and the surface of the structural member in the section where the tension material is inclined with respect to the surface of the structural member and the parallel section. The structural member reinforcing tension member fixing structure in which the section inclined with respect to the surface of the structural member and the parallel section are attached to the structural member.

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