JP2008002122A - Expansion anchor and pinning method using it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an expansion anchor which enables anchoring to be applied to an area from a shallow portion of an insertion and filling hole drilled into a wall body to a deep portion thereof, and a pinning method using the expansion anchor. <P>SOLUTION: This expansion anchor 20, which is to be anchored into the insertion and filling hole 8 drilled in the wall body 1, comprises a tubular anchor 11 in which an expanded and opened portion 22 to be anchored into the insertion and filling hole 8 over the area from portion of a finishing material 3 in the shallow position to a portion of a concrete skeleton 2 in the deep position is formed, and an expansion pin 12 which pushes open the expanded and opened portion 22 by being relatively pushed into the expanded and opened portion 22, so as to apply the anchoring. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an expansion anchor used for repairing a wall body such as an outer wall or an inner wall in which “floating” occurs, and a pinning method using the expansion anchor.

Conventionally, this type of pinning method (anchor pinning method with an inlet) is used to insert a cone and anchor body into an insertion hole that penetrates a finishing material (including mortar) such as a tile and drills a concrete frame to a predetermined depth. Is performed by injecting an expansion agent made of and injecting an adhesive from an injection port of the anchor body (see, for example, Patent Document 1).
Moreover, the expansion anchor used for this is comprised by the cylindrical anchor main body with an injection port, and the cone which pushes the expansion anchor part of an anchor main body. The anchor main body is composed of an expanded anchor portion into which a cone is driven, a trunk portion that continues to the anchor portion, and a flange portion that continues to the trunk portion and presses the finishing material. A plurality of split slits are formed in the expanded anchor portion, and a plurality of openings are formed in the trunk portion for guiding the adhesive to the hole wall side of the insertion hole.
After the expansion anchor is driven, if an adhesive is injected from the inlet of the anchor body, the adhesive will fill the anchor body and then flow into the hole wall side of the insertion hole from the plurality of split slits and the plurality of openings. Harden. As a result, the expansion anchor whose pressing member is pressed by the flange portion is anchored physically and chemically into the insertion hole, and the wall body is repaired.
JP 2000-34839 A

  In such a conventional expansion anchor, the anchor body into which the cone is driven is anchored only to the concrete frame, and the finishing material (tile and mortar) to be repaired is pressed by the flange portion of the expansion anchor. It becomes. For this reason, if the adhesive is not sufficiently injected into the gap between the insertion hole and the outer peripheral surface of the expansion anchor, the finishing material may fall off the expansion anchor due to an earthquake or the like.

  An object of the present invention is to provide an expansion anchor that can perform anchoring over a wide area from a shallow part to a deep part of an insertion hole, and a pinning method using the expansion anchor.

  The expansion anchor of the present invention is an expansion anchor that is anchored to the insertion hole drilled in the wall body, and forms an expanded portion that is anchored from a shallow position to a deep position with respect to the insertion hole. And an expansion pin that is pushed into the expanded portion to expand the expanded portion for anchoring.

  According to this configuration, when the expansion pin is relatively pushed into the expanded portion to expand the expanded portion, the tubular anchor extends from the shallow position of the insertion hole to the deep position via the expanded portion. Is anchored. Further, since the expansion pin that pushes the expanded portion has at least the same length as the expanded portion, the shear strength can be increased. In addition, relative pushing of the expansion pin to the cylindrical anchor is carried out by mounting the cylindrical anchor in the insertion hole in advance and pushing the expansion pin into the insertion hole, and inserting the expansion pin into the insertion hole. There is a method in which the cylindrical anchor is pushed into (injected) into this, and any form (method) may be used.

  In this case, the widened portion may have a split slit extending in the axial direction from the distal end of the cylindrical anchor to the vicinity of the proximal end portion, and an inward projecting portion disposed in parallel to the split slit. preferable.

  According to this configuration, when the expansion pin is relatively pushed into the expanded portion, the expanded portion is expanded by the inwardly protruding portion disposed in parallel with the split slit, and the cylindrical anchor is positioned at a shallow position of the insertion hole. The anchor is uniformly anchored over a deep position. In addition, the inward projecting portion may be continuous or intermittent as long as it is arranged in parallel with the split slit.

  In this case, it is preferable that the pair of split slits and the pair of inward protruding portions are alternately arranged in the circumferential direction.

  According to this configuration, the two pieces of the cylindrical anchor are spread outwardly with the pair of split slits as a boundary, and are strongly pressed against the insertion hole. Moreover, since the cylindrical anchor has a simple structure, it can be easily manufactured.

  Another expansion anchor of the present invention is an expansion anchor that is anchored to an insertion hole drilled in a wall body, and is an expansion anchor that is anchored at a plurality of positions from a shallow position to a deep position with respect to the insertion hole. It is characterized by comprising a cylindrical anchor having an open portion and an expansion pin that is pushed into the expanded portion for anchoring to expand the expanded portion.

  According to this configuration, when the expansion pin is relatively pushed into the expanded portion and the expanded portion is expanded, the tubular anchor extends from the shallow position of the insertion hole to the deep position via the expanded portion. Anchored at multiple locations. Further, since the expansion pin that pushes the expanded portion has at least the same length as the expanded portion, the shear strength can be increased. In addition, relative pushing of the expansion pin to the cylindrical anchor is carried out by mounting the cylindrical anchor in the insertion hole in advance and pushing the expansion pin into the insertion hole, and inserting the expansion pin into the insertion hole. There is a method in which the cylindrical anchor is pushed into (injected) into this, and any form (method) may be used.

  In this case, the widened portion has a split slit extending in the axial direction from the distal end of the cylindrical anchor to the vicinity of the proximal end portion, and a plurality of inward protruding portions formed in an annular shape across the split slit. Preferably it is.

  According to this configuration, when the expansion pin is relatively pushed into the expanded portion, the expanded portion is expanded by the plurality of inwardly projecting portions formed annularly across the split slit, and the cylindrical anchor is inserted into the insertion hole. Are anchored uniformly at a plurality of locations ranging from a shallow position to a deep position. It should be noted that the plurality of inwardly protruding portions are not necessarily arranged at a uniform pitch in the axial direction.

  In these cases, it is preferable that the wall body has a finishing material and a concrete frame, and the expanded portion is anchored to the finishing material and the concrete frame through insertion holes.

  According to this configuration, the cylindrical anchor is anchored not only to the concrete frame but also to the finishing material. For this reason, even if injection | pouring of an adhesive agent is inadequate or not, a finishing material can be anchored to a concrete frame physically and firmly via a cylindrical anchor.

  In these cases, it is preferable that the expansion pin is pushed into the expanded portion from the proximal end side of the cylindrical anchor.

In the form in which the cylindrical anchor is pushed into the expansion pin inserted into the insertion hole (the expansion pin is pushed into the expanded portion from the distal end side of the cylindrical anchor), the expanded portion of the cylindrical anchor is partially expanded. While being inserted into the insertion hole. For this reason, there is a possibility that the insertion hole may be cut and spread.
According to said structure, since the expansion part of a cylindrical anchor expands simply in an insertion hole, the above malfunctions do not arise.

  In these cases, it is preferable that a male screw is formed on the outer peripheral surface of the expansion pin, and the expansion pin is screwed into the expanding portion and pushed out.

  According to this configuration, when the push pin is screwed into the screw receiving portion with a tool or the like, the expansion pin moves forward and is pushed into the expanding portion of the cylindrical anchor, which can be spread. Thereby, a cylindrical anchor can be anchored without noise. The expanding portion may have a form in which a female screw is formed by a screwed push pin, or a female screw may be formed in advance.

  In these cases, it is preferable that the cylindrical anchor has a restricting portion that restricts the pushing end position of the expansion pin at the tip.

  In this case, it is preferable that the restricting portion is formed by bending the tip end portion of the cylindrical anchor inward.

When the depth of the insertion hole becomes uneven due to wear of the drilling tool, etc., the pushed-in expansion pin is pushed in excessively or insufficiently into the expanded part of the cylindrical anchor. The anchoring area may be reduced.
According to this configuration, since the restriction portion for restricting the push-in end position of the expansion pin is provided at the distal end portion of the cylindrical anchor, the push-in depth of the expansion pin with respect to the spread portion is made appropriate without excess or deficiency. be able to. Further, by forming the restricting portion by bending the tip end portion of the cylindrical anchor, the restricting portion can be easily provided.

  In these cases, it is preferable that the wall body has a finishing material and a concrete housing, and the cylindrical anchor has a collar portion that holds the finishing material at the base end portion.

  Similarly, it is preferable that the wall body has a finishing material and a concrete frame, and the expansion pin has a head portion for pressing the finishing material at the base end portion.

  According to this configuration, the finishing material can be pressed by the flange portion of the cylindrical anchor or the head portion of the expansion pin, and the finishing material can be physically and firmly attached to the concrete frame via the cylindrical anchor or the expansion pin. Can be anchored. In this case, the insertion hole is preferably provided with a counterbore hole in the opening, and the bottom of the counterbore hole is brought into contact with the flange portion of the cylindrical anchor or the head of the extension pin to hold the finishing material. . However, in the case where the latter is provided with a head on the extension pin, the head is made thicker and thinner than the insertion hole, and at the edge of the insertion hole (in this case, a straight hole without a counterbore hole). The finishing material may be pressed by contacting the head.

  In these cases, it is preferable that a passage hole for feeding the adhesive into the insertion hole is formed through the shaft center of the expansion pin.

  According to this configuration, the adhesive can be reliably injected to the innermost part of the insertion hole through the flow path hole, and the cylindrical anchor can be anchored chemically and firmly to the concrete frame. it can.

  Another expansion anchor of the present invention is an expansion anchor that is anchored to an insertion hole formed in the anchored material, and is an expansion anchor that is anchored from a shallow position to a deep position with respect to the insertion hole. A tubular anchor having an open portion and an expansion pin that is pushed into the expanded portion to push the expanded portion relative to the anchoring portion for anchoring. It has a split slit extending in the axial direction to the vicinity of the end portion, and an inward projecting portion disposed in parallel to the split slit.

  According to this configuration, when the expansion pin is relatively pushed into the widened portion, the entire widened portion is pushed wide by the inwardly projecting portion disposed in parallel to the split slit, and the tubular anchor The anchoring is performed over a wide area from a shallow position to a deep position of the insertion hole. Further, since the expansion pin that pushes the expanded portion has at least the same length as the expanded portion, the shear strength can be increased. In addition, relative pushing of the expansion pin to the cylindrical anchor is carried out by mounting the cylindrical anchor in the insertion hole in advance and pushing the expansion pin into the insertion hole, and inserting the expansion pin into the insertion hole. There is a method in which the cylindrical anchor is pushed into (injected) into this, and any form (method) may be used. Further, the inward projecting portion may be continuous or intermittent as long as it is arranged in parallel with the split slit.

  The pinning method of the present invention is a pinning method for repairing a wall body made of a finishing material and a concrete frame using the above-described expansion anchor, and penetrates the finishing material to a required repair point of the wall body to form a concrete frame. A drilling step for drilling the insertion hole, an insertion step for inserting an expansion anchor into the insertion hole, and an anchoring step for pushing the expansion pin relatively to push the expanded portion are provided. And

  According to this configuration, since the cylindrical anchor can be anchored from the shallow position to the deep position of the insertion hole through the expanded portion, the pullout strength of the expansion anchor is combined with the increase in shear strength. Can be dramatically improved. In particular, if the tubular anchor is anchored to the finishing material at a shallow position of the insertion hole, the finishing material can be firmly anchored to the concrete frame via the expansion anchor, and it floats from the concrete frame. The finishing material can be repaired well.

  In this case, it is preferable to further include an adhesive injection step of injecting an adhesive into the insertion hole from the opening of the insertion hole after the anchoring step.

  Alternatively, it is preferable to further include an adhesive injection step of injecting an adhesive into the insertion hole from the opening of the insertion hole between the drilling step and the insertion step.

  According to these configurations, the finishing material can be firmly anchored to the concrete frame via the expansion anchor even with the adhesive, and the finishing material floating from the concrete frame can be repaired satisfactorily. In particular, in the case of injecting the adhesive before the insertion process, the expansion anchor (tubular anchor) does not get in the way when injecting the adhesive, so the adhesive is properly applied to the insertion hole and the floating part of the finishing material. Can be injected.

  Another pinning method of the present invention is a pinning method for repairing a wall body made of a finishing material and a concrete frame using the above-mentioned expansion anchor, and the concrete is made by penetrating the finishing material at a repair point of the wall body. A drilling step of drilling an insertion hole in the housing, an insertion step of inserting a cylindrical anchor into the insertion hole, an adhesive injection step of injecting an adhesive into the insertion hole from the opening of the insertion hole, An anchoring step of pushing the expansion pin into the cylindrical anchor and pushing the expanded portion after the adhesive injection step is provided.

  According to these configurations, the finishing material can be anchored firmly to the concrete frame via the expansion anchor, even with the adhesive injected into the insertion hole via the cylindrical anchor, and the finish floating from the concrete frame. The material can be repaired satisfactorily.

  As described above, according to the expansion anchor and the pinning method of the present invention, the tubular anchor can be anchored from the shallow position to the deep position of the insertion hole via the expanded portion, The pullout strength and shear strength of the anchor can be significantly increased. In particular, when the wall body is made of a finishing material and a concrete frame, the finishing material floating from the concrete frame can be repaired satisfactorily.

  Hereinafter, an expansion anchor according to an embodiment of the present invention and a pinning method using the same will be described with reference to the accompanying drawings. This pinning method is an anchor pinning method using a so-called anchor with an injection port (expansion anchor), and repairs a “floating portion” generated on a wall body such as an outer wall of a building, an atrium or an inner wall of a hole. In the embodiment, the expansion anchor is driven into the insertion hole drilled in the repair required portion of the outer wall so as to press the finishing material, and the adhesive is injected to repair the outer wall.

  As shown in the structural diagram of FIG. 1 and the cross-sectional view of FIG. 2, the outer wall 1 is composed of a concrete frame 2 and a finishing material 3, and the finishing material 3 is a mortar 4 and a decorative material 5 such as a tile or stone attached to the mortar 4. And is constituted by. In this case, it is assumed that the first floating portion 6 is generated between the concrete frame 2 and the mortar 4 and the second floating portion 7 is generated between the mortar 4 and the decorative material 5. Further, in order to repair this, the outer wall 1 is formed with an insertion hole 8 that penetrates through the decorative material 5 and the mortar 4 and perforates the concrete casing 2 to a predetermined depth. Then, the outer wall 1 is repaired by driving the expansion anchor 10 into the insertion hole 8 and injecting the adhesive R.

  As shown in FIG. 1, the expansion anchor 10 includes a cylindrical anchor 11 that is inserted into the insertion hole 8 and serves as a main body of the expansion anchor 10, and an expansion pin 12 that pushes the cylindrical anchor 11 in the insertion hole 8. The decorative cap 13 closes the opening 8a of the insertion hole 8. On the other hand, the insertion hole 8 into which the expansion anchor 10 is inserted has a counterbore hole 8b in the opening 8a and penetrates the finishing material 3 to a depth of 20 mm or more with respect to the concrete frame 2. Yes.

  The cylindrical anchor 11 includes a cylindrical base portion (base end portion) 21 and an expanded portion 22 connected to the cylindrical base portion 21 and is integrally formed of stainless steel or the like. The inside of the cylindrical base 21 is a so-called injection port 24, and the adhesive R is injected from the injection port 24 into the insertion hole 8 (details will be described later). In addition, a pair of split slits 25, 25 extending in the axial direction over the entire length are formed in the expanded portion 22 of the cylindrical anchor 11. The pair of split slits 25, 25 are arranged at symmetrical positions of 180 ° with respect to each other, and the expanding portion 22 is formed such that both halves thereof are mutually separated by the expansion pin 12 with the pair of split slits 25, 25 as a boundary. It is designed to be pushed outward.

  The expansion portion 22 is a portion that is expanded by the expansion pin 12, and has a pair of inward protruding portions 26, 26 parallel to the pair of split slits 25, 25. The pair of inward projections 26, 26 are provided 90 ° apart from the pair of split slits 25, 25 in the circumferential direction, and the split slits 25 and the inward projections 26 are alternately arranged in the circumferential direction. Is formed. Each inward projecting portion 26 is formed by being deformed into a substantially “M” cross section by a press or the like, and the expansion pin 12 simultaneously contacts both inward projecting portions 26, 26, thereby expanding the portion 22. These two halves are pushed open to the outside with the pair of slits 25, 25 as a boundary, and are anchored in the insertion hole 8. In this case, each inward projecting portion 26 extends in the axial direction over the entire length of the expanded portion 22, and the expanded portion 22 is anchored to the inner peripheral surface of the insertion hole 8 with a large area. It is like that. Note that the inward protruding portion 26 may extend intermittently in the axial direction over the entire length of the expanded portion 22.

  The total length of the cylindrical anchor 11 configured in this way is formed slightly shorter than the depth of the insertion hole 8, and the cylindrical anchor 11 is loaded in the insertion hole 8 so that the tip abuts against the hole bottom. Then, the expansion part 22 faces the finishing material 3 and the concrete frame 2, and the base end is positioned so as to be slightly submerged from the counterbore hole 8b (see FIG. 2). Thus, the expanded portion 22 pushed open by the expansion pin 12 is physically anchored to both the finishing material 3 and the concrete frame 2. That is, in the state where the first floating portion 6 is generated between the concrete housing 2 and the mortar 4 as described above, the finishing material 3 is anchored to the concrete housing 2 via the expansion anchor 10. .

  Note that the cylindrical anchor 11 may have an integral structure using a pipe material as a raw material, and the slits 25, the inward protruding portions 26, and the like may be formed in the integrated structure. Alternatively, after the cylindrical anchor 11 has a half-split structure using a plate material as a raw material, the plate material is bent into a semicircular shape, and a notch portion, an inward protruding portion 26, or the like that becomes a split slit 25 is formed (pressed). The half pieces may be joined together and welded at the cylindrical base portion 21 or may be combined integrally with a resin or metal ring.

  The expansion pin 12 is a member that pushes the expanding portion 22, and includes a pin taper portion 31 on the distal end side, a pin main body 32 that continues to the pin taper portion 31, and a pin head portion 33 on the base end side that continues to the pin main body 32. It is integrally formed of stainless steel or the like. The outer diameter of the pin body 32 is slightly smaller than the inner diameter of the cylindrical base portion 21 of the cylindrical anchor 11, and when the expansion pin 12 is driven into the cylindrical anchor 11, the pin taper portion 31 is expanded. Then, the expanding portion 22 is pushed open by hitting the inwardly protruding portion 26, and the pin main body 32 maintains the expanded state of the expanding portion 22 following this (anchoring). Further, the pin head 33 reaches the hole bottom of the counterbore hole 8b in a state where the expansion pin 12 is driven into the cylindrical anchor 11, and presses the decoration material 5. In other words, the length of the expansion pin 12 corresponds to the length of the substantially cylindrical anchor 11, and the pin head 33 reaches the bottom of the counterbore hole 8 b by driving the expansion pin 12. The tip is positioned in front of the bottom of the insertion hole 8. Therefore, the expansion pin 12 after driving also functions as a core material of the cylindrical anchor 11.

  Further, a channel hole 34 for injecting the adhesive R is formed through the shaft center of the expansion pin 12. When the adhesive R is injected from the opening 8 a of the insertion hole 8 in a state where the expansion pin 12 is driven into the cylindrical anchor 11, a part of the adhesive R passes through the flow path hole 34 and the tip of the expansion pin 12. And flows from the bottom of the insertion hole 8 to the inner peripheral surface of the insertion hole 8 and the first floating portion 6 through the split slit 25. Further, a part of the adhesive R wraps around the second floating portion 7 from the gap between the expansion pin 12 and the cylindrical anchor 11 or the gap between the cylindrical anchor 11 and the insertion hole 8 on the base side. That is, the adhesive R is poured into the insertion hole 8 simultaneously from the bottom side and the base side. In this case, in order to perform the injection of the adhesive R from the base side more smoothly, although not shown in the drawing, a plurality of lateral holes that connect the outer peripheral surface of the expansion pin 12 and the flow path hole 34 may be formed. ,preferable. In addition, although the expansion pin 12 may use a round bar as a raw material and may form the flow-path hole 34 in this, you may make it form a thick pipe material as a raw material.

  The decorative cap 13 includes a disc-shaped cap body 41 formed to have the same diameter as the opening (the counterbore hole 8b) 8a of the insertion hole 8, and a fitting shaft portion 42 that fits into the flow passage hole 34 of the expansion pin 12. And are integrally formed. The cap body 41 is baked with the same color as the decorative material 5. When the decorative cap 13 is mounted so that the fitting shaft portion 42 is fitted into the flow path hole 34 of the expansion pin 12, the cap body 41 is fitted into the opening portion (counterbore hole 8 b) 8 a of the insertion hole 8. Thereby, the surface of the cap main body 41 and the surface of the decorative material 5 are flush with each other, and the cosmetic cap 13, that is, the repaired portion, is extremely inconspicuous. The cap head 41 can also serve as the pin head 33 of the expansion pin 12. In such a case, the cosmetic cap 13 can be omitted.

  Here, the adhesive injector 50 for injecting the adhesive R into the insertion hole 8 will be briefly described with reference to FIG. The adhesive injector 50 includes a pump-type injector main body 51 that supplies the adhesive R, and an injection nozzle 52 that is detachably attached to the injector main body 51. The injector body 51 includes a bottomed cylindrical casing 54, a pump body 55 to which the casing 54 is detachably attached, and a lever 56 held by the pump body 55. The casing 54 is filled with an adhesive R. By manually operating (pumping) the lever 56, the adhesive R is discharged from the injection nozzle 52 by a certain amount. In addition, although the epoxy resin adhesive is used for the adhesive agent R, it is not restricted to this, For example, various organic adhesive agents may be an inorganic adhesive agent etc. which has viscosity from the first.

  The injection nozzle 52 is detachably attached to the injector main body 51 and has a connection arm 57 that is formed in an “L” shape as a whole, a nozzle outer cylinder 58 supported by the connection arm 57, and an inner surface of the nozzle outer cylinder 58. And an operation rod 60 that is connected to the tail end of the nozzle inner tube 59 and moves the nozzle inner tube 59 forward and backward. A tapered seal rubber 58 a that is pressed against the opening 8 a is provided at the tip of the nozzle outer cylinder 58. The adhesive R sent out from the injector main body 51 by pumping flows into the nozzle outer cylinder 58 from the connection arm 57 and further flows from the nozzle outer cylinder 58 to the nozzle inner cylinder 59 through a small hole. It is injected into the insertion hole 8 from the discharge port 59a. At that time, the nozzle inner cylinder 59 is slid by the operating rod 60 to adjust the position (insertion depth) of the discharge port 59a, and the opening 8a is sealed by the seal rubber 58a of the nozzle outer cylinder 58 (nozzle outer cylinder). 58), the injector body 51 is pumped (adhesive injection).

  Here, with reference to FIG. 4 and FIG. 5, the procedure is demonstrated about the pinning method for outer wall 1 repair using said expansion anchor 10. FIG. This pinning method includes a drilling process for drilling an insertion hole 8 at a repaired portion of the outer wall 1, an insertion process for inserting the expansion anchor 10 into the insertion hole 8, a driving process for driving the expansion pin 12, an insertion process An adhesive injection process for injecting the adhesive R into the filling hole 8 and a capping process for mounting the decorative cap 13 are provided. Prior to the drilling step, the outer wall 1 is keyed to detect the drilling position (floating portion) of the insertion hole 8 and marking is performed at the center position of the decoration material 5 at the corresponding location.

  In the drilling step, the insertion hole 8 is drilled in the concrete casing 2 to a predetermined depth through the finishing material 3 at a marking location by a drilling tool 71 such as a diamond core drill (FIG. 4A). In this case, the auxiliary bit 73 is attached to the base of the drill bit 72 so that the counterbore 8b is formed at the same time. In addition, the drilling depth to the concrete housing 2 is 20 mm or more (Ministry of Land, Infrastructure, Transport and Tourism specification), and the diameter of the insertion hole 8 is 1 mm to 2 mm thicker than the diameter of the expansion anchor 10 (4 mm to 6 mm).

  In the insertion step, the cylindrical anchor 11 is introduced so that the tip thereof reaches the bottom of the insertion hole 8 (FIG. 4B). In the subsequent driving step, the expansion pin 12 is inserted into the cylindrical anchor 11, and the expansion pin 12 is driven by the hammer 74 (FIG. 4C). In the final stage of driving, for example, a dedicated punch 75 is applied to the expansion pin 12, and the expansion pin 12 is applied to the expansion pin 12 via the punch 75 by the hammer 74, and the pin head 33 contacts the bottom of the counterbored hole 8b. It is driven in until it comes into contact (FIG. 5A). When the expansion pin 12 is driven, the expanded portion 22 of the cylindrical anchor 11 expands from the proximal end side to the distal end side, and is anchored from the finishing material (mortar 4) 3 to the concrete casing 2. When the pin head 33 reaches the bottom of the counterbore 8b, it is felt that the progress of the driving is worsened and this process is completed.

  In the adhesive injection step, the resin injection 50 is used, the injection nozzle 52 is applied to the opening 8a of the insertion hole 8, and the adhesive R is injected (FIG. 5B). The adhesive R discharged from the injection nozzle 52 is injected from the distal end side of the expansion pin 12 into the insertion hole 8 through the flow path hole 34 and is also injected from the proximal end side. Eventually, the adhesive R reaches the first floating portion 6 and the second floating portion 7 and spreads in a circle in the first floating portion 6 and the second floating portion 7 (see FIG. 5C). In this way, when the adhesive R is sufficiently injected into the insertion hole 8, the first floating portion 6 and the second floating portion 7, the pumping becomes extremely heavy and the injection of the adhesive R is completed. Experienced. The adhesive R fills up to the position of the counterbore 8b, and the process proceeds to the next capping step before the adhesive R is cured.

  In the capping step, the fitting shaft portion 42 is fitted into the flow passage hole 34 of the expansion pin 12, and the decorative cap 13 is fitted so as to be fitted into the counterbore hole 8b (FIG. 5C). In this case, the decorative cap 13 is pushed so that the surface of the cap main body 41 and the surface of the decorative material 5 are flush with each other. Further, when the adhesive R overflows by being attached to the decorative cap 13, it is wiped off before the adhesive R is cured, or scraped off with a cutter or the like after it is cured.

  In the above-described pinning method, the drilling process, the insertion process, the driving process, the adhesive injection process, and the capping process are performed in this order, but the order of the processes can be changed. For example, the adhesive injection step is performed after the drilling step and before the insertion step. That is, before the cylindrical anchor 11 is inserted into the insertion hole 8, the adhesive R is injected into the insertion hole 8 (injection from a deep position toward a shallow position). If it does in this way, while being able to inject | pour adhesive R reliably to the innermost part of the insertion hole 8 with said injection | pouring nozzle 52, it is adhesive agent also to the 1st floating part 6 and the 2nd floating part 7. R can be sufficiently injected. If the volume of the expansion anchor 10 and the volume of the portion inserted into the insertion hole 8 of the injection nozzle 52 are substantially the same (adjusted by the diameter of the inner cylinder), the adhesive R can be used when the expansion anchor 10 is mounted. Does not overflow from the insertion hole 8.

  Similarly, an adhesive injection step may be performed after the insertion step and before the driving step. That is, after inserting the cylindrical anchor 11 into the insertion hole 8, the adhesive R is injected into the insertion hole 8. In this case, the adhesive R can be reliably injected up to the innermost part of the insertion hole 8, and the first floating part 6 and the second floating part 7 are interposed via the pair of split slits 25, 25. Also, the adhesive R can be sufficiently injected. However, since the expansion anchor 10 of this embodiment is anchored not only to the concrete frame 2 but also to the finishing material 3 and exhibits sufficient pulling strength, the adhesive injection step can be omitted. In these modifications of the pinning method, it is preferable to use the expansion pin 12 without the flow hole 34 because the flow hole 34 of the expansion pin 12 is not utilized.

  As described above, according to the present embodiment, the expanded portion 22 of the cylindrical anchor 11 pushed and expanded by the expansion pin 12 is anchored not only to the concrete housing 2 but also to the finishing material 3. That is, the expansion anchor 10 is anchored to the insertion hole 8 with a wide area from a deep position to a shallow position. For this reason, in the expansion anchor 10 of this embodiment, not only sufficient pulling strength is produced, but also the finishing material 3 can be anchored reliably. Moreover, since the expansion pin 12 functions as a core material of the cylindrical anchor 11, the shear strength of the expansion anchor 10 can be remarkably increased. Alternatively, the cylindrical anchor 11 may be formed thin and the expansion pin 12 may be driven by the operator's hand instead of a hammer (for example, a wooden piece is applied and pressed strongly).

  Next, the expansion anchor 10 according to various modifications of the first embodiment will be briefly described. In the expansion anchor 10A of the first modified example shown in FIG. 6, the inward protruding portion 27 of the expanded portion 22 in the tubular anchor 11 is formed by a plurality of general ring-shaped by “caulking” or “drawing” processing or the like. An inward protruding portion 27 is formed. That is, the expanded portion 22 is provided with a plurality of inwardly protruding portions 27 formed in an annular shape across the split slit 25, and the cylindrical anchor 11 is placed on the finishing material 3 and the concrete frame 2 (a deep position of the insertion hole 8. Anchoring (over a shallow position). A plurality of inward protruding portions 27 are provided facing the finishing material 3 and a plurality of inward protruding portions 27 are provided facing the concrete frame 2.

  In the expansion anchor 10B of the second modified example shown in FIG. 7, the expansion pin 12 does not have the pin head 33, and instead of the pin head 33, the flange 23 is formed on the cylindrical base 21 of the cylindrical anchor 11. ing. That is, the decorative material 5 is pressed by the collar 23. Further, the cylindrical anchor 11 has a restricting portion 28 so as to be continuous with the distal end side of the expanding portion 22. The restricting portion 28 is a portion that restricts the pushing end position (driving depth) of the expansion pin 12, and includes a pair of restricting pieces 28 a and 28 a formed by bending a part of the distal end portion of the expanding portion 22 inward. It is configured (only one side may be bent). When the expansion pin 12 is driven into the expanding portion 22 (driving step), the expanding portion 22 expands and the tip of the expansion pin 12 hits the restricting portion 28, and it is felt that the driving is completed. Thereby, the driving depth of the expansion pin 12 with respect to the cylindrical anchor 11 becomes appropriate. In the adhesive injection step using the expansion anchor 10B, the injection of the adhesive R is substantially performed from the injection port 24 of the cylindrical anchor 11.

  In the expansion anchor 10 </ b> C of the third modification shown in FIG. 8, the expansion pin 12 without the pin head 33 is inserted from the distal end side of the cylindrical anchor 11. In this case, the cylindrical anchor 11 is driven into the expansion pin 12 previously inserted into the insertion hole 8. Also in this case, the expanded portion 22 of the cylindrical anchor 11 extends long in the axial direction, and the flange portion 23 that holds the decorative material 5 is formed on the cylindrical base portion 21. However, the regulating portion 28 is not formed on the cylindrical anchor 11.

  Next, with reference to FIG. 9 and FIG. 10, an expansion anchor 10D according to a second embodiment of the present invention will be described. The expansion anchor 10D of this embodiment includes a cylindrical anchor 11 and a decorative cap 13 that are formed in the same manner as in the second modification of the first embodiment, and an expansion pin 12 that is fully threaded. That is, the cylindrical anchor 11 includes a cylindrical base portion 21 having a flange portion 23, an expanded portion 22 connected to the cylindrical base portion 21, and a regulating portion 28 connected to the expanded portion 22, and is integrally formed of stainless steel or the like. ing. Also in this case, the widened portion 22 is formed with a pair of split slits 25, 25 and a pair of inwardly protruding portions 26, 26.

  On the other hand, the expansion pin 12 is constituted by a straight pin having a male screw 12a engraved on the entire outer peripheral surface, and a tool engaging groove with which a tool engages is formed on the base end surface, although not shown in the drawing. Further, a channel hole 34 for injecting the adhesive R is formed through the shaft center of the expansion pin 12. When the expansion pin 12 is screwed into the cylindrical anchor 11, the male screw 12 a portion of the expansion pin 12 bites into the expanded portion 22 of the cylindrical anchor 11 and pushes the expanded portion 22. In addition, you may form the internal thread corresponding to the external thread 12a in the expansion part 22 of the cylindrical anchor 11. FIG. Moreover, it is good also as a structure which abbreviate | omits the collar part 23 of a cylindrical anchor and provides the pin head 33 in the expansion pin 12. FIG.

  In the pinning method using the expansion anchor 10D of this embodiment, the expansion pin 12 is screwed into the cylindrical anchor 11 with a driver bit or the like in the driving step. In this expansion anchor 10D, as in the first embodiment, the insertion anchor hole can be anchored over a large area, and the finishing material can also be anchored reliably. Furthermore, since the expansion pin 12 is screwed, the pinning method can be performed without noise. Various variations (modifications) of the first embodiment are also applicable to the second embodiment.

  In addition, in said 1st Embodiment and 2nd Embodiment, in the thing which provides the pin head 33 in the expansion pin 12, it is good also as a structure which makes this pin head 33 serve as the makeup | decoration cap 13. FIG. For example, in the expansion anchor 10E according to the fourth modified example of FIG. 11A, the pin head 33A of the expansion pin 12 is formed in a circular flat head shape, while the insertion hole 8 is a straight hole without the counterbore hole 8b. It has become. The pin head 33 </ b> A is thin with a thickness of about 0.3 mm to 0.5 mm, and has a diameter somewhat larger than the diameter of the opening 8 a of the insertion hole 8. Further, the pin head 33 </ b> A is colored by baking coating or the like so as to match the color of the surface of the decorative material 5. In the expansion anchor 10E, the expansion pin 12 is driven to a position where the pin head 33A covers the opening 8a.

  Similarly, in the expansion anchor 10F according to the fifth modified example of FIG. 11 (b), the pin head 33B of the expansion pin 12 is formed in a countersunk screw shape, while the opening of the insertion hole 8 configured by a straight hole. 8a is chamfered according to the pin head 33B. Also in this case, the pin head 33B is formed to have a diameter somewhat larger than the diameter of the opening 8a of the insertion hole 8, and is colored by baking painting or the like so as to match the color of the surface of the decorative material 5. . In this expansion anchor 10F, the expansion pin 12 is driven so that the pin head 33B is flush with the decorative material 5.

  Next, a case where the expansion anchor of the present invention is applied to a general-purpose anchor will be described as a third embodiment. FIG. 12A shows an expansion anchor 10G used when a tank B or the like is installed on a concrete base A, or when a bracket is fixed to a concrete wall. FIG. 12B shows a pipe connected to a slab C. This is an expansion anchor 10H used when installing a suspension bolt D that supports the like.

  The expansion anchor 10 </ b> G of FIG. 10A includes a cylindrical anchor 11, an expansion pin 12, and a fixing nut 15, as in the above embodiment. The cylindrical anchor 11 has a cylindrical base portion 21 and an expanded portion 22, and has a fixing screw portion 29 that is connected to the proximal end of the cylindrical base portion 21 and has an external thread formed on the outer peripheral surface thereof. Also in this case, the expanded portion 22 is formed long from the shallow position to the deep position of the insertion hole 8 as in the first embodiment, and a pair of split slits 25 and a pair of parallel slits extending in parallel thereto. And an inward protruding portion 26. The expansion pin 12 has a length corresponding to the expanded portion 22. Note that the expansion pin 12 may be a screw-in type as in the first embodiment. On the other hand, the fixing screw portion 29 protrudes to the outside from the insertion hole 8, and the leg portion and the bracket of the tank B are fixed to the expansion anchor 10G by a nut 15 screwed into this portion.

  Similarly, the expansion anchor of FIG. 2B includes a cylindrical anchor 11 and an expansion pin 12, and the cylindrical anchor 11 has a cylindrical base portion 21 and an expanded portion 22 that is long in the axial direction. . Further, similarly to the above, the expanding portion 22 has a pair of split slits 25 and a pair of inwardly projecting portions 26 parallel thereto. A female screw 21 a is formed on the inner peripheral surface of the cylindrical base 21. The suspension bolt D is installed by screwing the upper end of the suspension bolt D into the cylindrical base portion 21 of the expansion anchor 10H driven into the insertion hole 8 of the slab C. In this case, the expansion pin 12 may be screwed.

(A) is a disassembled perspective view of the expansion anchor which concerns on 1st Embodiment, (b) is sectional drawing of the expansion anchor which concerns on 1st Embodiment. It is sectional drawing of the construction state of the expansion anchor which concerns on 1st Embodiment. It is an external view of the adhesive injection device used for the pinning method of this embodiment. (A) is sectional drawing showing the drilling process of the pinning method which concerns on this embodiment, (b) is sectional drawing showing the insertion process, (c) is a cross section showing the implantation process (1). FIG. (A) is sectional drawing showing the driving process (1), (b) is sectional drawing showing the adhesive agent injection | pouring process, (c) is sectional drawing showing the capping process. It is sectional drawing of the expansion anchor which concerns on a 1st modification. It is sectional drawing of the expansion anchor which concerns on a 2nd modification. It is a disassembled perspective view of the expansion anchor which concerns on a 3rd modification. (A) is a disassembled perspective view of the expansion anchor which concerns on 2nd Embodiment, (b) is sectional drawing of the expansion anchor which concerns on 2nd Embodiment. It is sectional drawing of the construction state of the expansion anchor which concerns on 2nd Embodiment. (A) is sectional drawing of the expansion anchor which concerns on a 4th modification, (b) is sectional drawing of the expansion anchor which concerns on a 5th modification. It is sectional drawing of the construction state of the expansion anchor which concerns on 3rd Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Outer wall 2 Concrete frame 3 Finishing material 4 Mortar 5 Decoration material 6 1st floating part 7 2nd floating part 8 Insertion hole 8a Opening part 10 Expansion anchor 10A Expansion anchor 10B Expansion anchor 10C Expansion anchor 10D Expansion anchor 10E Expansion anchor 10F Expansion Anchor 10G Expansion anchor 10H Expansion anchor 11 Cylindrical anchor 12 Expansion pin 12a Male thread 21 Cylindrical base portion 22 Expanding portion 23 Gutter portion 25 Split slit 26 Inwardly projecting portion 27 Inwardly projecting portion 28 Restricting portion 33 Pin head 33A Pin head Portion 33B Pin head 34 Channel hole 52 Injection nozzle R Adhesive

Claims (18)

An expansion anchor anchored in the insertion hole drilled in the wall,
A cylindrical anchor that forms an expanded portion that is anchored from a shallow position to a deep position with respect to the insertion hole;
An expansion anchor, comprising: an expansion pin that is pushed relatively to the expansion portion and expands the expansion portion for the anchoring.   The expanding portion has a split slit extending in the axial direction from the distal end of the cylindrical anchor to the vicinity of the proximal end portion, and an inward projecting portion disposed in parallel to the split slit. The expansion anchor according to claim 1, wherein   The expansion anchor according to claim 2, wherein the pair of split slits and the pair of inwardly projecting portions are alternately arranged in the circumferential direction. An expansion anchor anchored in the insertion hole drilled in the wall,
For the insertion hole, a cylindrical anchor that forms an expanded portion that is anchored at a plurality of locations ranging from a shallow position to a deep position;
An expansion anchor, comprising: an expansion pin that is pushed relatively to the expansion portion and expands the expansion portion for the anchoring.   The expanding portion has a split slit extending in the axial direction from the distal end of the cylindrical anchor to the vicinity of the proximal end portion, and a plurality of inward protruding portions formed in an annular shape across the split slit. The expansion anchor according to claim 4. The wall body has a finishing material and a concrete frame,
The expansion anchor according to any one of claims 1 to 5, wherein the expansion portion is anchored to the finishing material and the concrete frame through the insertion hole.   The expansion anchor according to any one of claims 1 to 6, wherein the expansion pin is pushed into the expansion portion from a proximal end side of the cylindrical anchor. On the outer peripheral surface of the extension pin, a male screw is formed,
The expansion anchor according to claim 7, wherein the expansion pin is screwed into the expansion portion to push it wide.   The expansion anchor according to claim 7 or 8, wherein the cylindrical anchor has a restricting portion for restricting a pushing end position of the expansion pin at a distal end portion.   The expansion anchor according to claim 9, wherein the restricting portion is formed by bending a distal end portion of the cylindrical anchor inward. The wall body has a finishing material and a concrete frame,
The expansion anchor according to any one of claims 1 to 10, wherein the cylindrical anchor has a flange portion that holds the finishing material at a proximal end portion. The wall body has a finishing material and a concrete frame,
The expansion anchor according to any one of claims 7 to 10, wherein the expansion pin has a head for pressing the finishing material at a base end.   The expansion anchor according to any one of claims 7 to 12, wherein a passage hole for feeding an adhesive into the insertion hole is formed through the shaft center of the expansion pin. An expansion anchor that is anchored in the insertion hole formed in the anchored material,
A cylindrical anchor that forms an expanded portion that is anchored from a shallow position to a deep position with respect to the insertion hole;
For the anchoring, an expansion pin that is pushed in relative to the expansion portion and expands the expansion portion, and
The expanding portion has a split slit extending in the axial direction from the distal end of the cylindrical anchor to the vicinity of the proximal end portion, and an inward projecting portion disposed in parallel to the split slit. Feature expansion anchor. A pinning method for repairing a wall body made of the finishing material and the concrete frame using the expansion anchor according to any one of claims 1 to 13,
A drilling step of drilling the insertion hole in the concrete frame through the finishing material at a repair point of the wall body;
An insertion step of inserting the expansion anchor into the insertion hole;
And an anchoring step of pushing the expansion pin relatively and pushing the expansion portion apart.   The pinning method according to claim 15, further comprising an adhesive injection step of injecting an adhesive into the insertion hole from the opening of the insertion hole after the anchoring step.   The adhesive injection step of injecting an adhesive into the insertion hole from the opening of the insertion hole between the drilling step and the insertion step, further comprising: Pinning method. A pinning method for repairing a wall body composed of the finishing material and the concrete frame using the expansion anchor according to any one of claims 7 to 13,
A drilling step of drilling the insertion hole in the concrete frame through the finishing material at the repair point of the wall body;
An insertion step of inserting the cylindrical anchor into the insertion hole;
An adhesive injection step of injecting an adhesive into the insertion hole from the opening of the insertion hole;
After the adhesive injection step, there is an anchoring step of pushing the expansion pin into the cylindrical anchor and expanding the expanded portion.

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