JP4392208B2 - Anchor extractor and anchor extraction method using the same - Google Patents

Description

  The present invention relates to an anchor extractor for extracting an anchor driven into a concrete structure and an anchor extracting method using the anchor extractor.

  When attaching a scaffold for an outer wall construction, an advertising signboard, or the like to a concrete structure, a hole is usually drilled at a predetermined location of the structure and an anchor is connected to the anchor.

  There are two types of anchors: one that attaches anchor bolts that become connecting members to scaffolds after being driven into the structure (cut anchor), and one that anchor bolts are integrated from the beginning (set anchor) There is. Of these, the former cut anchor is composed of a cylindrical sleeve having an axial slit formed at the tip, a female threaded portion on the inner periphery, and a cone that is press-fitted into the sleeve tip. By driving in a hole drilled in the structure, the tip of the sleeve is expanded and fixed to the structure, and then an anchor bolt is screwed into the sleeve.

  On the other hand, the latter set anchor has a cone-shaped bolt in which a cylindrical sleeve having an axial slit formed at the tip portion and a cone that is press-fitted into the sleeve tip portion at the tip of the male screw portion passed through the sleeve are integrally formed. As in the case of the cut anchor, the male threaded portion of the cone-attached bolt that is fixed to the structure and protrudes from the base end of the sleeve is used as a connecting member to the scaffold or the like.

  If these anchors are left after use, the rust of the anchors flows in the rain water and often contaminates the outer wall of the structure. For this reason, in the case of a cut anchor, the sleeve is driven in advance so as not to protrude from the outer wall of the structure, and after use, resin mortar is applied and repaired. In the case of a set anchor, a resin mortar is applied after cutting and removing a portion protruding from the outer wall of the structure. However, since the resin mortar does not have a strong adhesive force, the resin mortar may gradually float or peel off over time, and it may not be possible to prevent contamination of the outer wall of the structure due to rusting of the anchor.

  The above problem can be solved by removing the anchor driven into the structure after use. However, for that purpose, it is necessary to scrape the concrete around the anchor, which is more expensive and labor-intensive than repairing with resin mortar, and is not preferable in terms of the strength of the structure.

On the other hand, with respect to cut anchors, various tools have been proposed for removing the surrounding concrete without scraping after use. This type of anchor extractor includes a rod having a male threaded portion that is coupled to the female threaded portion of the sleeve, and by continuing to rotate the rod in a state where it is screw-coupled to the sleeve, the sleeve is held by the rod while pressing the cone at the tip of the rod. Many are moved to the base end side and pulled out. Note that the cone left in the hole in the structure after the sleeve is pulled out is not fixed to the structure and can be easily taken out (see, for example, Patent Document 1).
Registered Utility Model No. 3082084

  However, since the above-described conventional anchor extractor continuously rotates the rod screwed to the sleeve and pulls out the sleeve, the internal thread portion of the sleeve is deformed when driven or the surface of the internal thread portion is made of sand or the like. If foreign matter is attached, a considerably strong force is required to rotate the rod, and there is a problem that the extraction work becomes very troublesome. Further, there is a problem that the male thread portion of the rod is easily worn and the life is short.

  On the other hand, for the set anchor, the above-described extraction tool cannot be used, and there is no method for extracting the surrounding concrete without shaving.

  An object of the present invention is to easily remove an anchor driven into a concrete structure.

  In order to solve the above-described problems, the present invention includes an anchor extractor including a cylindrical holder that is coupled to an anchor sleeve, and a rod that is screwed into the inner periphery of the holder. Continue to rotate with the screw connected, and while holding the anchor cone or bolt with cone at the tip of the rod, move the holder to the rod proximal side using the reaction of the propulsive force of the rod and combine with the holder The sleeve was pulled out.

  Specifically, the anchor includes a cylindrical sleeve having an axial slit formed at the distal end portion and a female thread portion coupled to an anchor bolt on the inner periphery, and a cone press-fitted into the sleeve distal end portion ( Cut anchor), as an anchor extractor, a cylindrical holder having a male threaded portion coupled to the female threaded portion of the sleeve of the cut anchor, and screwed into the holder inner periphery from the base end side of the holder, A rod equipped with a rod that holds down the anchor cone is used.

  In this anchor extraction method using the extractor for the cut anchor, the anchor sleeve and the holder of the extractor are screw-coupled, and then the rod of the extractor is continuously rotated in a state of being screw-coupled to the holder. Thus, while holding the anchor cone at the tip of the rod, the holder is moved to the rod proximal end side, and the sleeve coupled to the holder is pulled out.

  In addition, the anchor includes a cylindrical sleeve having an axial slit formed at the tip, and a cone-attached bolt integrally formed with a cone that is press-fitted into the sleeve tip at the tip of the male screw portion that is passed through the sleeve. In the case of a set anchor, a cylindrical holder that is inserted into the base end of the sleeve of the set anchor as a anchor removal tool and is coupled to the sleeve with a set screw screwed from the outer periphery side, A rod that is screwed into the inner periphery of the holder from the base end side and that has a rod that presses the bolt with the cone of the anchor at the distal end is adopted.

  In the anchor extraction method using the set anchor extraction tool, an engagement portion that is engaged with the set screw of the extraction tool is provided in advance at the proximal end of the sleeve of the anchor, and the set screw is After screwing in from the outer peripheral side of the holder of the extractor and fitting its tip part into the engaging part of the sleeve to join the holder and the sleeve, the rod of the extractor is kept rotating in a state where it is screwed to the holder. In this way, the holder is moved to the rod proximal end side while pressing the anchor cone bolt at the tip of the rod, and the sleeve coupled to the holder is pulled out.

  In the present invention, as described above, the rod screwed into the inner periphery of the cylindrical holder coupled to the sleeve of the anchor is continuously rotated in a state of being screw-coupled with the holder, and the holder is moved to the rod proximal end side. Since the sleeve coupled with is pulled out, the anchor can be easily pulled out regardless of the type of anchor, regardless of the deformation state of the sleeve and the surface condition.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 6. FIG. 1 shows a state in the middle of extracting a cut anchor 3 driven into a concrete structure 2 using the anchor extractor 1 of the first embodiment. The cut anchor 3 includes a cylindrical sleeve 4 in which an axial slit 4 a is formed at the distal end portion, and a cone 5 that is press-fitted into the distal end portion of the sleeve 4. Used to attach a scaffold or the like via anchor bolts (not shown) that are fixed to the structure 2 by being driven into the hole 2a that is opened and fixed to the structure 2. It is. A female threaded portion 4b for screwing the anchor bolt is formed on the inner periphery of the base end side of the sleeve 4, and this female threaded portion 4b is used for screwing the anchor extractor 1 and the sleeve 4 at the time of extraction. Is done.

  As shown in FIG. 2, the anchor extractor 1 includes a cylindrical holder 6, a rod 7 screwed into the inner periphery of the holder 6 from the proximal end side of the holder 6, and a pair of rounds attached to the outer periphery of the holder 6. It consists of a rod-shaped handle 8.

  The holder 6 has a male screw portion 6a for coupling with the female screw portion 4b of the sleeve 4 of the anchor 3 on the outer periphery of the tip portion thereof, and a female screw portion 6b for screwing with the rod 7 on the inner periphery of the base end portion. . In addition, a pair of screw holes 6c are provided at opposite positions in the circumferential direction on the cylindrical wall of the central portion, and the male screw portion 8a at the tip of the handle 8 is screwed into each screw hole 6c so that each handle 8 can be attached. ing.

  On the other hand, the rod 7 has a male screw portion 7a coupled to the female screw portion 6b of the holder 6 on the base end side of the body portion, and grips and rotates a hexagonal cross-section head portion 7b formed at the base end. As a result, it is screwed into the inner periphery of the holder 6 and presses the cone 5 of the anchor 3 at the front end of the trunk.

  Below, based on FIG. 3, the method of extracting the cut anchor 3 after use with this anchor extraction tool 1 is demonstrated. First, as shown in FIG. 3A, the holder 6 of the extractor 1 is screwed into the sleeve 4 of the anchor 3 from which the anchor bolt has been removed, and the holder 6 and the sleeve 4 are coupled. Next, as shown in FIG. 3 (b), when the wrench 9 fitted to the head 7 b of the rod 7 of the extractor 1 is rotated and the rod 7 is screwed into the holder 6, Contacts the cone 5 of the anchor 3. When the rod 7 continues to rotate in this state, the rod 7 presses the cone 5 and the holder 6 moves integrally with the sleeve 4 toward the proximal end side of the rod 7 due to the reaction of the propulsive force of the rod 7.

  Then, as shown in FIG. 3 (c), when the sleeve 4 is pulled out to some extent and separated from the cone 5, and the front end portion of the sleeve 4 that has been expanded returns to its original state, the wrench 9 is removed and both hands are removed. As shown in FIG. 3D, only the sleeve 4 can be pulled out by holding the handle 8 of the extractor 1 and pulling it up while swinging left and right. Thereafter, the cone 5 left in the hole 2a of the structure 2 may be taken out using an appropriate tool or the like.

  In this cut anchor extraction method, since the rod of the extraction tool is not directly screwed to the anchor sleeve as in the prior art, the female threaded portion of the sleeve is deformed when driven or foreign matter such as sand is present on the surface of the female threaded portion. Even when it is attached, the rod can be rotated easily and the extraction work can be performed efficiently. In such a case, it is somewhat difficult to screw the holder into the sleeve. However, since the holder only needs to be screwed to such an extent that it is not separated from the sleeve, there is no need for trouble at this time. In addition, the extractor has less wear on the male threaded portion of the rod and has a longer life than the conventional tool.

  FIG. 4 shows a state in the middle of extracting the set anchor 11 from the concrete structure 2 using the anchor extractor 10 of the second embodiment. The set anchor 11 is integrally formed with a cylindrical sleeve 12 having an axial slit 12a formed at the distal end, and a cone 14 press-fitted into the distal end of the sleeve 12 at the distal end of the male screw portion 13a passed through the sleeve 12. It consists of a bolt 13 with a cone, is fixed to the structure 2 in the same manner as the cut anchor 3 of the first embodiment, and the male threaded portion 13a of the bolt 13 protruding from the base end of the sleeve 12 is used as a connecting member with a scaffold or the like It is what is done. A pair of through-holes 12b as engagement portions for coupling the anchor extractor 10 to the sleeve 12 are provided on the cylindrical wall at the base end portion of the sleeve 12 at opposite positions in the circumferential direction.

  As shown in FIG. 5, the anchor extractor 10 includes a cylindrical holder 15, a rod 16 screwed into the inner periphery of the holder 15 from the proximal end side of the holder 15, and a pair of rounds attached to the outer periphery of the holder 15. It consists of a rod-shaped handle 17. The method of attaching each handle 17 to the holder 15 is the same as in the first embodiment.

  The holder 15 has a distal end portion into which a proximal end portion of the sleeve 12 of the anchor 11 is inserted. A screw hole for screwing a set screw 18 into a position corresponding to each through hole 12 b of the sleeve 12. 15a is provided. Further, a female thread portion 15b for screw coupling with the rod 16 is formed on the inner periphery of the base end portion. For convenience of explanation, FIG. 4 shows a state in which only the screw hole 15a is rotated 90 ° in the circumferential direction of the holder 15.

  On the other hand, the rod 16 has a male thread 16a whose whole body part is coupled to the female thread part 15b of the holder 15, and, like the first embodiment, grips and rotates the head 16b having a hexagonal cross section. As a result, it is screwed into the inner periphery of the holder 15 and presses the bolt 13 with a cone of the anchor 11 at the front end of the trunk.

  Hereinafter, based on FIG. 6, the method of extracting the set anchor 11 with this anchor extraction tool 10 is demonstrated. First, as shown in FIG. 6 (a), the base end portion of the sleeve 12 of the anchor 11 and the male screw portion 13a of the bolt 13 with cone are inserted into the holder 15 of the extractor 10, and the through hole 12b of the sleeve 12 and the holder Alignment with 15 screw holes 15a is performed. Then, the set screw 18 is screwed from the outer periphery side of the holder 15, and the tip end portion thereof is fitted into the through hole 12 b of the sleeve 12, so that the holder 15 and the sleeve 12 are coupled.

  Subsequent procedures can be performed in the same manner as in the first embodiment described with reference to FIG. That is, as shown in FIG. 6 (b), the rod 16 of the extractor 10 is rotated and screwed into the holder 15, and is rotated even after the front end of the body portion comes into contact with the male screw portion 13a of the bolt 13 with cone. By continuing, the holder 15 is moved integrally with the sleeve 12 toward the proximal end side of the rod 16 while pressing the bolt 13 with the cone at the distal end portion of the rod 16. Then, as shown in FIG. 6 (c), when the sleeve 12 is pulled out to some extent, the handle 17 of the extractor 10 is lifted while swinging with both hands, as shown in FIG. 6 (d). The sleeve 12 can be pulled out. The remaining cone-attached bolt 13 can be easily removed manually.

  According to this set anchor extraction method, the anchor can be easily extracted manually without cutting the concrete around the anchor as in the prior art.

  In each of the embodiments described above, after the anchor sleeve is pulled out to some extent, the sleeve is pulled out by using the handle attached to the pulling tool. You may do it. In this case, it is not necessary to attach the handle to the extraction tool.

Longitudinal front view showing a state where a cut anchor is being extracted (first embodiment) External perspective view of the extractor of FIG. The principal part front view explaining the 1st procedure of anchor extraction by the extraction tool of FIG. Front view explaining the second procedure Front view explaining the third procedure Front view explaining the fourth procedure Longitudinal front view showing a state in the middle of removing the set anchor (second embodiment) 4 is an external perspective view of the extractor in FIG. The principal part front view explaining the 1st procedure of anchor extraction by the extraction tool of FIG. Front view explaining the second procedure Front view explaining the third procedure Front view explaining the fourth procedure

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Anchor extractor 2 Structure 3 Cut anchor 4 Sleeve 5 Cone 6 Holder 7 Rod 8 Handle 9 Wrench 10 Anchor extractor 11 Set anchor 12 Sleeve 13 Cone bolt 14 Cone 15 Holder 16 Rod 17 Handle 18 Set screw

Claims (2)

  An anchor extractor for extracting an anchor driven into a concrete structure, wherein the anchor has a cylindrical sleeve having an axial slit formed at the tip, and a sleeve tip at the tip of a male screw passed through the sleeve This is a cylindrical holder that is composed of a bolt with a cone that is integrally formed with a cone that is press-fitted into the sleeve, and the base end of this anchor sleeve is inserted and joined to the sleeve with a set screw that is screwed in from the outer periphery. And a rod screwed into the inner periphery of the holder from the base end side of the holder and pressing the bolt with the cone of the anchor at the distal end. A method of extracting the anchor driven into the concrete structure, which the anchor according to claim 1, the proximal end portion of the sleeve of the anchor, set screw anchor extracting block according beforehand in claim 1 After the engaging screw is engaged, the set screw is screwed in from the outer peripheral side of the holder of the anchor extractor, and the tip is fitted into the engaging portion of the sleeve to join the holder and the sleeve. The rod of the anchor extractor is continuously rotated while being screwed to the holder, and the holder is moved to the rod base end side while pressing the bolt with the cone of the anchor at the tip of the rod and coupled to the holder. An anchor extraction method characterized by pulling out a sleeve.

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