JP5399216B2 - anchor - Google Patents

Description

  The present invention relates to an anchor used for fixing a rod-shaped body such as a round steel or a deformed steel bar to various types of housings such as a concrete building or a structure.

  2. Description of the Related Art Conventionally, when a concrete is newly placed on a frame such as a concrete structure or a bedrock, a so-called driving anchor method has been widely adopted. This drive-in anchor construction method is to drill a pilot hole for embedding in the housing in advance, insert a differential anchor into this pilot hole, and drive it with a hammer to expand the outer periphery of the anchor. To fix the difference muscle anchor to the housing.

  As such a differential muscle anchor, what was described in patent document 1, for example is known. Specifically, this differential bar anchor is provided with a deformed bar steel bar having vertical and horizontal ribs and nodes, and a plurality of slits that are caulked and integrated with the tip of the reinforcing bar and extend from the tip along the axial direction. An expansion sleeve and a truncated cone cone nut whose small diameter end is press-fitted to the tip of the expansion sleeve are provided, and the outer diameter of the expansion sleeve is substantially the same as the outer diameter of the deformed bar steel bar. It has been done. And this differential bar anchor is constructed by inserting the differential bar anchor into the pilot hole of the housing from the corn nut side and driving the deformed bar steel bar with a hammer or the like with the tip of the wedge body in contact with the bottom of the hole. . By this driving, the corn nut is press-fitted into the expansion sleeve, and along with this press-fitting, the tip of the expansion sleeve expands radially outward while scraping the concrete wall along the tapered surface of the corn nut. The differential muscle anchor is fixed to the frame by opening.

  This differential muscle anchor is convenient because the differential muscle can be easily and quickly fixed to the housing. Moreover, since the outer diameter of the expanding sleeve is formed to be approximately equal to the outer diameter of the deformed bar steel reinforcing bar, the expanding sleeve has a larger diameter than the reinforcing bar. The diameter of the pilot hole drilled in the housing can be reduced, and the burden of drilling the pilot hole can be reduced.

Japanese Patent Laid-Open No. 10-231583

  However, in this differential reinforcement anchor, the cone nut is only press-fitted into the expansion sleeve, and as described above, the outer diameter of the expansion sleeve is formed substantially equal to the outer diameter of the deformed bar steel reinforcement. In this case, there is a problem that the contact portion between the expanding sleeve and the corn nut is reduced, and the holding force of the corn nut by the expanding sleeve is reduced.

  For example, when the differential anchor is unexpectedly dropped at the site, the cone nut is dropped from the expanding sleeve by the impact, and in some cases, the cone nut is scattered and lost. In addition, transportation of this differential anchor is performed for each box in which a large number of anchors are stored, but when the differential anchors come into contact with each other due to vibration during transportation, the cone nut falls off the expansion sleeve. There was also.

  When the corn nut falls off the expansion sleeve, it must be reset each time, which is troublesome and causes a problem that work efficiency at the site is reduced.

  The present invention has been made in view of the above-mentioned conventional problems, and even when the outer diameter of the expanding sleeve is configured to be substantially equal to the outer diameter of a rod-shaped body such as a deformed bar steel rod, the tip of the expanding sleeve An object of the present invention is to provide an anchor that can effectively prevent the wedge body (cone nut) that is inserted into the nut from falling off.

  In order to solve the above-described problems, an anchor according to the present invention has a rod-shaped body, an expansion sleeve having an outer diameter substantially the same as the outer diameter of the rod-shaped body, and the rod-shaped body mounted on the base end portion. And a wedge body having a small-diameter end inserted into the distal end portion of the expansion sleeve, and the wedge body is attached to the expansion sleeve by being applied across at least the expansion sleeve and the wedge body. And a fixing film body that is torn along with the expansion of the expansion sleeve.

  According to the present invention, since the expanding sleeve has an outer diameter substantially equal to the outer diameter of the rod-shaped body, when constructing this anchor, only a pilot hole having a diameter corresponding to the rod-shaped body is drilled. It's okay. That is, it is not necessary to drill a large-diameter pilot hole in accordance with an expanding sleeve having a diameter larger than that of a rod-shaped body such as a reinforcing bar, and the work load of the drilling work can be reduced accordingly. In addition, since a fixing film body is provided which covers the expanding sleeve and the wedge body and fixes the wedge body to the expanding sleeve, the fixing film body allows the wedge to be wedged. The body can be restrained to effectively prevent the dropout. In addition, since the fixing film body is configured to tear along with the expansion of the expansion sleeve, for example, unnecessary work such as removing the fixing film body before work is saved, It is possible to suppress a decrease in the function of the expanding sleeve due to the fixing film body.

  In the present invention, the fixing film body may have a bottomed or bottomless cylindrical shape, a strip shape, a sack shape, and the like, and specifically, the diameter of the expanding sleeve. However, the fixing film body is made of a tubular heat-shrinkable film. It is preferable that the attachment is performed by heating in a state of being mounted across the expanding sleeve and the wedge body.

  If comprised in this way, it can attach simply by heating in the state with which the heat-shrinkable film formed in the cylinder shape was mounted ranging over an expansion sleeve and a wedge body. In addition, when the heat-shrinkable film is heat-shrinked in this attachment, the adhesion between the film, the expanding sleeve and the wedge body is high, so that at least a rust-preventing effect can be obtained at the adhered portion of the film. . In addition, by using the cylindrical film, it can be fixed over the entire circumference of the expanding sleeve and the wedge body, and the wedge body can be more reliably prevented from falling off. This anti-rust effect can be obtained even when the fixing film body is moisture-proof and has high adhesion to the expanding sleeve and the wedge body, even if it is made of a material other than the heat-shrinkable film. Can do.

  In the present invention, the fixing film body is not particularly limited in relative position with respect to the wedge body as long as the wedge body can be fixed to the expanding sleeve. However, it is preferable that the tip of the fixing film body extends to the tip of the wedge body, more preferably the fixing film body is It is preferable to have a tip engaging portion that engages with the tip surface of the wedge body at the tip portion. For example, when the fixing film body is formed of a heat-shrinkable film, the tip engagement portion is configured such that, for example, the cylindrical heat-shrinkable film is wedged with the tip projecting from the tip of the wedge body. By inserting into the body and the expanding sleeve and heating in this state, at least a part of the protruding front end portion of the heat shrinkable film can be configured as a front end engaging portion.

  If comprised in this way, the fall of the wedge body from an expansion sleeve can be prevented reliably by the front-end | tip engaging part of the film body for fixation.

  Further, in the present invention, although the color of the fixing film body and the range of application to the expanding sleeve and the wedge body are not particularly limited, the fixing film body is colored and the base end thereof is the anchor. It is preferable to extend to the necessary burying position with respect to the pilot hole.

  If comprised in this way, it can be visually recognized easily whether the anchor is embed | buried to the desired position, while being able to construct an anchor reliably and appropriately, construction management can be performed easily. In addition, this coloring does not specifically limit a color, Red, yellow, white, black etc. may be sufficient, and a translucent thing may be sufficient.

  In the present invention, the fixing film body may not have a hole in its peripheral surface, but the fixing film body is pivoted on a portion corresponding to the tip of the expanding sleeve. A slit extending in the direction is preferably provided.

  With this configuration, the fixing film body can be easily cleaved by the slit, and the expanded portion of the expansion sleeve is easily exposed through the slit, so that a sufficient anchor effect can be achieved with a simple configuration. Can be obtained.

  Further, in the present invention, the mounting structure of the expansion sleeve to the rod-shaped body is not particularly limited, but the rod-shaped body has a rod body and a reduced diameter mounting portion provided at the tip of the rod body. And it is preferable that the said expansion sleeve is mounted | worn with the said rod-shaped body by welding in the state by which the said diameter reduction attachment part was fitted to the base end part.

  If comprised in this way, an expansion sleeve can be attached to a rod-shaped body simply and reliably.

  In this case, it is preferable that an idle groove having a depth reaching the outer periphery of the reduced diameter mounting portion is provided over the entire circumference between the rod body and the expansion sleeve.

  If comprised in this way, the play with respect to a bending deformation will arise for the part of a play groove | channel, Therefore The tolerance with respect to the external force from the side of a rod-shaped body can be improved.

  According to the anchor according to the present invention, it is only necessary to drill a pilot hole having a diameter corresponding to the rod-shaped body in the construction, and compared to an anchor having an expanding sleeve having a larger diameter than the outer diameter of the rod-shaped body, The burden of work can be reduced. Moreover, although the expanding sleeve has an outer diameter substantially equal to the outer diameter of the rod-shaped body, the wedge body can be reliably held by the fixing film body, and the falling off can be effectively prevented. it can. In addition, since the fixing film body is configured to tear along with the expansion of the expansion sleeve, for example, unnecessary work such as removing the fixing film body before work is saved, It is possible to suppress a decrease in the function of the expanding sleeve due to the fixing film body.

It is a perspective view which shows the anchor which concerns on one Embodiment of this invention in the state which notched some cylindrical films. It is a half sectional view which shows the anchor. It is a side view shown in the state which decomposed | disassembled the anchor. It is a side view which shows the assembly | attachment state before the heating of the anchor. It is a side view which shows the assembly | attachment state after the heating of the anchor. It is explanatory drawing which shows the construction state of the anchor. It is explanatory drawing which shows the installation state of the anchor in the state which notched some cylindrical films. It is a side view which shows the anchor which concerns on other embodiment of this invention.

  Hereinafter, an embodiment according to the present invention will be described with reference to the drawings. In addition, although the anchor of this embodiment demonstrates what uses a deformed steel bar as a rod-shaped body, a round steel may be used, and even if it is a rod-shaped body (for example, screw node reinforcement) instead of these. Good.

  FIG. 1 is a perspective view showing an anchor according to the present embodiment in a state where a part of a cylindrical film described later is cut out, and FIG. 2 is a cross-sectional view on one side (right side) of the anchor. FIG. 3 is a side view showing the anchor in an exploded state, and shows the anchor of FIG. 2 in a state rotated by 45 ° around the axis. The tubular film 9 is a translucent colored body as will be described later, and this point is expressed using dots in the drawings.

  The anchor 1 in this embodiment includes a deformed steel bar 3 (corresponding to a bar-shaped body), an expanding sleeve 5 attached to the tip of the deformed steel bar 3, and a wedge body 7 fitted into the tip of the expanding sleeve 5. And a so-called differential bar anchor provided with a tubular film 9 (corresponding to a fixing film body) deposited from the distal end portion of the deformed steel bar 3 to the distal end of the wedge body 7.

  The deformed steel bar 3 is a round bar-shaped steel material having a plurality of ribs 31 and nodes 32, and a rod main body 30 and a reduced diameter mounting portion 33 provided in a state where its axis is aligned with the tip of the bar main body 30. And have. The reduced diameter attachment portion 33 has a cylindrical shape whose diameter is smaller than the diameter d of the rod main body 30 by cutting the distal end portion of the deformed steel bar 3, and the outer peripheral surface is configured to be smooth. . In this embodiment, the reduced diameter mounting portion 33 has a smooth outer peripheral surface. However, for example, it may be provided with a thread, and in that case, in the proximal end portion of the expanding sleeve 5. A thread groove that engages with the thread is engraved on the peripheral surface.

  The expansion sleeve 5 is a cylindrical steel material having an outer diameter D substantially equal to the outer diameter d of the deformed steel bar 3, and is dimensioned so that the reduced diameter mounting portion 33 of the deformed steel bar 3 can be fitted to the base end portion. Is set. The expanding sleeve 5 has a plurality of expanding slits 52 extending in the axial direction and a plurality of recessed grooves 53 recessed along the circumferential direction at the distal end thereof.

  The expansion slit 52 is provided on the peripheral side wall of the expansion sleeve 5 so as to penetrate the side wall, and functions to easily expand the distal end portion of the expansion sleeve 5 outward in the radial direction. In the present embodiment, four of the widening slits 52 are arranged at 90 ° intervals on the peripheral side wall of the widening sleeve 5 and extend from the tip to about two thirds of the sleeve length along the axial direction.

  On the other hand, the concave groove 53 is for urging the expansion of the distal end portion of the expansion sleeve 5 together with the expansion slit 52, and is ring-shaped along the outer peripheral surface of the expansion sleeve 5 across the expansion slit 52. Is recessed. In addition, a plurality (four in the present embodiment) of the recessed grooves 53 are arranged along the axial direction of the expanding sleeve 5.

  The expansion sleeve 5 is attached to the distal end portion of the deformed steel bar 3 by fitting and welding the reduced diameter mounting portion 33 of the deformed steel bar 3 to the base end portion thereof. In each figure, 54 shows the welding trace of these expansion sleeves 5 and the deformed steel bar 3. In the present embodiment, the corresponding portion of the reduced diameter mounting portion 33 of the deformed steel bar 3 in the expanding sleeve 5 is sandwiched by a welding shaft (not shown), and both are welded by spot welding. Therefore, the welding mark 54 exists in the opposite position on the outer peripheral surface of the expansion sleeve 5.

  The position of the welding mark 54, that is, the welding position is not particularly limited, and may be welded at a plurality of locations in the axial direction, or may be welded at a single location or at three or more locations in the circumferential direction. There may be. However, in order to obtain a bonding strength of a certain level or more, it is preferable to weld a plurality of locations at equal intervals in the circumferential direction. Also, the welding technique is not particularly limited, and may be fusion welding such as TIG welding or plasma welding, resistance welding other than spot welding, or the like.

  The wedge body 7 has the same diameter shaft portion 71 (corresponding to the small diameter end portion) having the same diameter in the axial direction along the axial direction, and is connected to the tip end of the same diameter shaft portion 71 and gradually expands toward the tip end in the axial direction. It is comprised as a substantially truncated-conical steel material which has the diameter-expanding axial part 72 which diameters. The outer diameter of the same-diameter shaft portion 71 is formed to be substantially the same or slightly larger than the inner diameter of the distal end portion of the expansion sleeve 5, and this same-diameter shaft portion 71 is fitted into the distal end portion of the expansion sleeve 5, more specifically press-fitting. Thus, the wedge body 7 is attached to the expansion sleeve 5. The diameter-expanded shaft portion 72 is configured such that the distal end portion has a maximum diameter, and at least the maximum diameter is formed larger than the inner diameter of the distal end portion of the expansion sleeve 5. Has been.

  The tubular film 9 is attached in such a manner as to cover the outer peripheral surface of the deformed steel bar 3 over the distal end portion, the expanding sleeve 5 and the wedge body 7. The tubular film 9 is composed of, for example, a translucent tubular heat-shrinkable film colored in red or the like, and is attached to the deformed steel bar 3 or the like by shrinking the heat-shrinkable film. In this embodiment, the cylindrical film 9 is comprised from the shrink film which has moisture resistance.

  Specifically, the tubular film 9 includes a tubular body 91 that covers the outer peripheral surfaces of the distal end portion of the deformed steel bar 3, the expanding sleeve 5, and the wedge body 7, and a wedge body that is connected to the distal end of the tubular body 91. 7 and a distal end engaging portion 92 that engages with the distal end surface.

  The cylinder main body 91 is attached in a state of being in close contact with the deformed steel bar 3, the expansion sleeve 5 and the wedge body 7. The base end portion of the cylindrical main body 91 is located at the distal end portion of the deformed steel bar 3, and specifically extends to a necessary embedding position for a later-described prepared hole S <b> 1 of the anchor 1. Here, the necessary embedding position means the position of the anchor 1 that must be embedded in the pilot hole S1 of the housing S in order to obtain a predetermined anchor effect per anchor 1 in the installation state of the anchor 1 with respect to the housing S. Say.

  In addition, the tube main body 91 is provided with a plurality of elongated slits 93 in the circumferential direction of the tube main body 91 along the axial direction. Specifically, the slit 93 for cleavage is provided at a position corresponding to the expansion slit 52 of the expansion sleeve 5 in the axial direction, and is provided at a substantially central portion between the adjacent expansion slits 52 in the circumferential direction. It has been. The slit 93 for cleavage is formed with a narrow width and has corners at the tip and base ends, and stress is concentrated at the corners. Accordingly, as the distal end portion of the expansion sleeve 5 is expanded, the cylindrical main body 91 is cleaved from the longitudinal direction distal end portion or the proximal end portion of the cleavage slit 93, and through the slit 93, the expansion sleeve 5. At least a part of the tip portion of the is exposed.

  On the other hand, the tip engaging portion 92 is a tip portion of a cylindrical heat-shrinkable film before heating, as will be described later. It is configured by engaging the front end surface of the body 7. The tip engaging portion 92 does not necessarily need to be entirely in contact with the tip surface of the wedge body 7, and at least a part of the tip engaging portion 92 engages with the tip surface of the wedge body 7 to move the wedge body 7 in the axial direction. The specific configuration is not particularly limited as long as it can be constrained.

  The tubular film 9 is attached to the deformed steel bar 3, the expanding sleeve 5 and the wedge body 7 as follows, for example.

  That is, as shown in FIG. 4, by inserting the deformed steel bar 3, the expanding sleeve 5 and the wedge body 7 into a cylindrical heat-shrinkable film 9 (hereinafter referred to as “film before heating”) before heating, The film 9 is arranged in such a manner as to cover a predetermined range of the deformed steel bar 3, the expanding sleeve 5 and the wedge body 7. At this time, the front end portion of the pre-heating film 9 is arranged in a state protruding from the wedge body 7 to the front end side, while the base end portion of the pre-heating film 9 substantially corresponds to the necessary embedding position at the front end portion of the deformed bar 3. Place it at the specified position. Moreover, the slit 93 for tearing of the film 9 before a heating is arrange | positioned so that it may be located between the adjacent expansion slits 52 of the expansion sleeve 5. FIG.

  Next, by heating the anchor 1 in this state, the film 9 before heating is contracted, and the tubular film 9 is brought into close contact with the distal end portion of the deformed steel bar 3, the expanding sleeve 5 and the wedge body 7 as shown in FIG. It adheres to these in the state. At this time, the front end portion of the film 9 before heating that protrudes from the wedge body 7 is contracted by heating to be engaged with the front end surface of the wedge body 7, and this front end portion is configured as a front end engaging portion 92 of the tubular film 9. Is done.

  In the anchor 1 configured as described above, the tubular film 9 is attached to the outer peripheral surface of the deformed steel bar 3 from the distal end portion of the deformed steel bar 3 to the distal end of the wedge body 7, and the distal end engaging portion 92 of the tubular film 9 is provided. Is engaged with the front end surface of the wedge body 7 at least in part, so that the wedge body 7 can be reliably fixed to the expanding sleeve 5 and the wedge body 7 can be reliably prevented from falling off. it can. For this reason, even if this anchor 1 falls or vibration is applied to this anchor 1 during transportation, the wedge body 7 does not fall off, and a reduction in work efficiency can be reliably prevented.

  And since the cylindrical film 9 is comprised with the heat-shrink film, the cylindrical film 9 can be easily formed only by covering the film 9 before a heating from the deformed steel bar 3 to the wedge body 7, and heating. Moreover, since this heat-shrinkable film has moisture resistance, a rust-preventing effect can also be obtained in a range where the tubular film 9 is applied.

  This anchor 1 is constructed as follows, for example. FIG. 6 is an explanatory view showing an anchor construction state, and FIG. 7 is an explanatory view showing an anchor installation state in a state where a part of the tubular film is cut away.

  First, a pilot hole S1 for embedding the anchor 1 in the concrete frame S is drilled. In the anchor 1 of the present embodiment, the expanding sleeve 5 having an outer diameter substantially equal to the outer diameter of the deformed steel bar 3 is used. Therefore, only the prepared hole S1 having a diameter corresponding to the deformed steel bar 3 is drilled. For example, as compared with the case where an anchor having an expanded sleeve having a diameter larger than that of the deformed steel bar 3 is used, only a pilot hole having a smaller diameter is required, and the work load of the drilling work can be reduced accordingly.

  Next, as shown in FIG. 6, the tip end portion (end portion on the side of the wedge body 7) of the anchor 1 is inserted into the pilot hole S1, and the tip end surface of the wedge body 7 is brought into contact with the deep bottom portion of the pilot hole S1. . In this state, the base end portion of the tubular film 9 of the anchor 1 is disposed in the vicinity of the opening of the pilot hole S1. If the base end of the tubular film 9 protrudes greatly from the opening of the pilot hole S1, the anchor 1 cannot be embedded to the extent that a desired anchor effect is obtained. Drilling further deeply, the anchor 1 is inserted into the pilot hole S1.

  In this state, the base end portion (top portion) of the deformed steel bar 3 is driven with a hammer or the like. By this driving, the wedge body 7 is press-fitted into the expansion sleeve 5, and along with this press-fitting, the distal end portion of the expansion sleeve 5 moves along the tapered surface of the diameter-expanded shaft portion 72 of the wedge body 7 along the inner wall of the pilot hole S 1. While being sharpened, it expands outward in the radial direction, and the anchor 1 is fixed to the housing S by this expansion. With the expansion of the distal end portion of the expanding sleeve 5, the tubular film 9 is cleaved from the cleavage slit 93, and at least a part of the distal end portion of the expansion sleeve 5 is separated from the cleavage slit 93 and the cleavage slit. It abuts against the inner wall surface of the pilot hole S1 through the portion.

  The anchor 1 of the present embodiment is configured such that the tubular film 9 is cleaved by the cleaving slit 93, so that it can be applied with the tubular film 9 attached, and before the work This eliminates the extra effort of removing the tubular film 9, and the tip of the expanding sleeve 5 abuts the inner wall surface of the pilot hole (including the scraped portion) S1 through the tearing portion. The frictional resistance of the expansion sleeve 5 due to the tubular film 9 can be suppressed.

  In addition, the tubular film 9 is made of a colored translucent material, and the proximal end of the tubular film 9 extends to a necessary embedment position with respect to the pilot hole S1 of the anchor 1, so that the anchor 1 is desired. It is possible to easily visually check whether it is embedded up to the position, and it is possible to construct the anchor reliably and properly, and it is possible to easily perform construction management.

  In addition, the anchor 1 demonstrated above is one Embodiment of the anchor which concerns on this invention, The specific structure etc. can be suitably changed in the range which does not deviate from the meaning of this invention. Hereinafter, the modification is demonstrated.

  (1) In the above embodiment, a normal step surface (step portion) is provided between the rod body 30 and the reduced diameter attachment portion 33 in the deformed steel bar 3, and the step surface is expanded. The outer peripheral surface of the rod main body 30 and the outer peripheral surface of the expanding sleeve 5 are provided substantially flush with each other by contacting the proximal end surface of the sleeve 5, but as shown in FIG. Between the sleeve 5, a play groove 110 having a depth reaching the outer periphery of the reduced diameter attachment portion 33 may be provided over the entire periphery.

  For example, as shown in FIG. 8, in the deformed steel bar 3, a tapered portion 135 that gradually decreases in diameter toward the tip is provided between the rod main body 30 and the reduced diameter attaching portion 33, and the tapered portion 135 allows the idle groove 110 to be formed. Is provided.

  In the anchor 101 of this other embodiment, the play with respect to the bending deformation is generated by the amount of the play groove 110, so that the resistance to bending of the deformed steel bar 3 can be improved.

  In addition, this idle groove 110 is not only constituted by the tapered portion 135 of the deformed steel bar 3 as in the other embodiments described above, but also, for example, the expanding sleeve as the base end portion of the expanding sleeve 5 moves toward the base end. 5 may be configured by providing a sleeve taper portion that gradually decreases in diameter from the outer diameter to the inner diameter, or may be configured by providing both the taper portion 135 and the sleeve taper portion. It may be. Further, even when the idle groove has the stepped surface between the rod body 30 and the reduced diameter mounting portion 33 as in the above embodiment, the base end portion of the reduced diameter mounting portion 33 protrudes from the expansion sleeve 5. In this manner, the deformed steel bar 3 and the expanding sleeve 5 can be joined together.

  (2) The unheated film 9 of the above embodiment uses a bottomless cylindrical heat-shrinkable film, but may of course use a bottomed cylindrical film. In this case, it is possible to reliably prevent the wedge body 7 from falling off by the bottom of the tubular film, and it is possible to easily position the base end of the tubular film.

  (3) In the above-described embodiment, the tubular film 9 is attached from the tip of the wedge body 7 to the tip of the deformed steel bar 3 (specifically, the required embedding position of the anchor 1). The embodiment is not particularly limited as long as it extends over the wedge body 7 and the expanding sleeve 5.

  Therefore, for example, the base end of the tubular film (fixing film body) is positioned at the base end portion of the expansion sleeve 5, or the base end is positioned at the base end of the slit 52 of the expansion sleeve 5. May be.

  (4) In the above embodiment, the tubular film 9 made of a shrink film is used as the fixing film body, but the specific configuration of the fixing film body is not particularly limited.

  For example, as the fixing film body, a liquid rubber may be thinly applied across the expanding sleeve 5 and the wedge body 7 to form a rubber-like film, or a rubber shape having a smaller diameter than the expanding sleeve 5. The sheath membrane body may be mounted across the expanding sleeve 5 and the wedge body 7.

  (5) In the above embodiment, the fixing film body has a cylindrical shape. However, the fixing film body may have a band shape or a sheath shape.

  For example, the fixing film body may be composed of an adhesive tape having a width smaller than the diameter of the expanding sleeve 5. In this case, the adhesive tape is attached along the axial direction from one side of the tip of the deformed bar 3 and is attached to the other side of the tip of the deformed bar 3 via the tip of the wedge body 7. There may be.

  Alternatively, the fixing film body is pasted by an adhesive tape having a width equal to or larger than a half circumference of the expanding sleeve 5 in the same manner as the above-described small-width adhesive tape, and the distal end portion of the deformed steel bar 3, the expanding sleeve 5 and the wedge body 7. You may make it cover the whole outer peripheral surface.

  (6) In the above embodiment, the tear film 93 is provided in the tubular film 9 so that the tubular film 9 is easily tearable. The specific configuration for imparting openness is not limited to this.

  For example, the surface of the tubular film may be provided with a group of scars consisting of a large number of scratches or a large number of fine holes, and the scratches may be cleaved as a trigger, or for fixing a cylindrical film, etc. It may be formed so thin that the film body can be cleaved.

S skeleton S1 pilot hole 1 anchor 3 deformed steel bar (bar-shaped body)
33 Reduced diameter mounting portion 5 Expanding sleeve 7 Wedge body 71 Same diameter end (small diameter end)
9 Cylindrical film (fixing membrane)
91 Cylinder body 92 Tip engagement portion 93 Slit slit 110 Idle groove

Claims (7)

  A rod-shaped body, an expanded sleeve having an outer diameter substantially the same as the outer diameter of the rod-shaped body, and the rod-shaped body mounted on the base end, and a small-diameter end fitted into the distal end of the expanded sleeve The wedge body is fixed to the expansion sleeve by being applied across the wedge body and at least the expansion sleeve and the wedge body, and with the expansion of the expansion sleeve An anchor comprising: a fixing membrane body that is torn apart.   The fixing film body is made of a cylindrical heat-shrinkable film, and is attached by being heated while being mounted across the expansion sleeve and the wedge body. The anchor according to 1.   The anchor according to claim 1 or 2, wherein the fixing film body has a distal end engaging portion that engages with a distal end surface of the wedge body at a distal end portion thereof.   The anchor according to any one of claims 1 to 3, wherein the fixing film body is colored, and a base end thereof extends to a necessary burying position with respect to a pilot hole of the anchor. .   The anchor according to any one of claims 1 to 4, wherein the fixing film body is provided with a slit extending in an axial direction at a portion corresponding to a distal end portion of the expansion sleeve. .   The rod-shaped body has a rod main body and a reduced diameter mounting portion provided at the distal end of the rod main body, and the expansion sleeve is welded in a state where the reduced diameter mounting portion is fitted to a base end portion thereof. The anchor according to any one of claims 1 to 5, wherein the anchor is attached to the rod-shaped body.   The anchor according to claim 6, wherein a play groove having a depth reaching the outer periphery of the reduced diameter mounting portion is provided over the entire circumference between the rod body and the expansion sleeve.