JP2018150700A - Anchor fixing clip and anchor fixing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an anchor fixing clip and an anchor fixing method capable of easily performing a mounting work on an anchor at a construction site, and reducing a construction period and a construction cost without increasing a transportation cost.SOLUTION: An anchor fixing clip comprises: leg parts 2, 2; a pair of clamping parts 4, 4 for clamping an outer peripheral surface of an anchor; and a connecting part 3 for elastically connecting the clamping parts 4, 4. The leg parts 2, 2 are configured to project in a direction inclined with respect to an axis of the anchor, as well as to project outward of the connecting part 3 (up to a position further away from the axis of the anchor) with reference to the axis of the anchor when the outer peripheral surface of the anchor is appropriately clamped between the clamping parts 4, 4 and attached to the anchor.SELECTED DRAWING: Figure 1

Description

  The present invention fixes an anchor (a metal rod-like member embedded in a housing for the purpose of fixing various elements to the concrete housing or for the purpose of reinforcing the housing itself) in a drilling hole formed in the housing. The present invention relates to a clip that is used to make an anchor, and a method of fixing an anchor in a drilling hole by using the clip.

  In concrete structures, drill holes are formed in the floor, wall, or ceiling of the frame, and anchors (shear reinforcing bars) are inserted into these holes and backfilled with grout, etc. Work to increase the shear strength of the frame (shear reinforcement work) is being carried out.

  FIG. 5 is a diagram showing a general construction example (construction procedure) of the shear reinforcement work performed on the ceiling portion of the frame. First, as shown in FIG. 5A, cutting is performed using a core bit or the like from the ceiling surface 22 of the housing 21 upward (inside the housing 21) to form an upward hole 23. Then, a roughening process is performed on the hole 23 to make the inner wall of the hole 23 a rough surface. Next, a nozzle (not shown) of a grout injection hose is inserted into the hole 23, and as shown in FIG. 5 (2), from the hole bottom 23a (the innermost part of the hole 23) to the opening 23b side. The grout 24 is sequentially injected.

  Subsequently, before the injected grout 24 is cured, as shown in FIG. 5 (3), the shear reinforcing bar 11 is inserted upward from the opening 23 b into the hole 23. When the upper end of the shear reinforcing bar 11 reaches the hole bottom 23a, a wedge (drop prevention means) (not shown) is provided from the opening 23b side so that the shear reinforcing bar 11 does not fall until the grout 24 is hardened. Drive in and fix temporarily. Then, after the grout 24 is cured, the wedge is removed, and the opening 23b is closed with mortar 25 (or grout) as shown in FIG. 5 (4) to finish the surface.

  Thus, when performing shear reinforcement work on the ceiling of the housing, a fall prevention means such as a wedge is arranged in the opening 23b so that the shear reinforcement reinforcing bar 11 inserted into the hole 23 is not dropped, The troublesome work of removing is required, and a method that allows easier and smoother construction is desired.

  Therefore, as disclosed in JP-A-2006-183501, a method is proposed in which an anchor fixing means composed of a needle member and a ring member is previously attached to a shear reinforcing bar and these are inserted into a drilling hole. Has been. According to this method, it is possible to suitably hold the shear reinforcing bar in the drilling hole by simply inserting the shear reinforcing bar equipped with the anchor fixing means, and as a result, a means for preventing the fall to the opening of the drilling hole. Therefore, there is a possibility that both the arrangement work and the removal work are unnecessary, the construction period can be shortened, and the cost can be reduced.

JP, 2006-183501, A

  However, it is very difficult for the anchor fixing means described in Patent Document 1 to be attached to the shear reinforcement bar at the construction site. Therefore, various problems are derived.

  Specifically, in this anchor fixing means, a closed annular element (ring member) is used as a means for attaching the needle member to the outer periphery of the shear reinforcing reinforcing bar. In order to do this, it is necessary to first insert the upper end of the shear reinforcing bar without the nut into the ring member, and then attach and tighten the nut to the upper end of the shear reinforcing bar. Since torque management is required when tightening the nut, it is not realistic to perform the mounting operation at the construction site.

  Therefore, the mounting work of the fixing means is performed in advance in the factory, and the mounted shear reinforcing bar is transported to the construction site. In this case, the bulk (packing state) is compared with the case of transporting only the shear reinforcing bar. However, there is a problem that the conveyance cost increases. In addition, if a large number of shear-reinforced bars that have already been installed are packed in a random manner during transportation, the needle members that should protrude radially outward will bend inward during transportation, and the original function (inner wall of the hole) The function of being caught on the surface and preventing the fall) may be impaired. For this reason, in the case of transporting the installed shear reinforcing bars, it is necessary to pack them after sufficiently curing one by one, and there is a problem that the transportation cost further increases.

  The present invention is intended to solve such problems in the prior art, and can be easily carried out on the construction site at the construction site, and the construction period can be shortened without increasing the transportation cost. It is another object of the present invention to provide an anchor fixing clip and an anchor fixing method capable of reducing the construction cost.

  The anchor fixing clip according to the present invention includes a leg portion, a pair of sandwiching portions that sandwich the outer peripheral surface of the anchor, and a connecting portion that elastically connects the pair of sandwiching portions, and the clip is interposed between the sandwiching portions. When the outer peripheral surface of the anchor is properly clamped and attached to the anchor, the leg portion protrudes in a direction inclined with respect to the axis of the anchor, and outwards from the connecting portion with respect to the axis of the anchor (the anchor It is configured to protrude (to a position further away from the axis).

  The pair of sandwiching portions are configured to face each other at a predetermined interval, and at least one of them preferably has a bulging portion formed so as to bulge outwardly, and has two legs. It is preferable that the portions are configured to face each other at a predetermined interval, and the tip side is configured to expand.

  In the anchor fixing method according to the present invention, two anchor fixing clips having a size in which the tip end of the leg portion expands larger than the diameter of the drilling hole are arranged in opposite directions around the axis of the anchor, and It is characterized by being attached to the anchor in such a direction that the distal end side is inclined toward one side, and the leg portion is inserted into the drilling hole in a direction inclined toward the outside of the drilling hole. In this case, it is preferable that the leg portion of one anchor fixing clip attached to the anchor and the connecting portion of the other anchor fixing clip are tied together by a binding material.

  The anchor fixing clip according to the present invention has a very simple configuration, and can be manufactured very simply and at low cost by simply bending a metal wire without performing casting or welding. It can be used suitably when trying to fix the anchor in the drilling hole, including the case where the anchor is inserted and fixed upward into the drilling hole formed upward from the ceiling surface of the housing.

  According to the anchor fixing method of the present invention, there is no need to dispose or remove a fall prevention means such as a wedge on the opening side, and a finishing step (step of closing the opening of the drilling hole and finishing the surface) ) Can be carried out without waiting for the grout in the drilling hole to harden. As a result, the construction period can be shortened, the construction cost can be reduced, and the problem of an increase in the conveyance cost can be suitably avoided. .

FIG. 1 is a diagram showing an external configuration of an anchor fixing clip 1 according to a first embodiment of the present invention. FIG. 1 (1) is a plan view of the anchor fixing clip 1, and FIG. FIG. FIG. 2 is an explanatory view of the anchor fixing method according to the second embodiment of the present invention. FIG. 2 (1) is a front view of the upper part of the shear reinforcing bar 11 to which the anchor fixing clips 1 and 1 ′ are attached. FIG. 2 (2) is a side view thereof, and FIG. 2 (3) is a horizontal sectional view of the shear reinforcing bar 11 taken along line XX shown in FIG. 2 (2). FIG. 3 is an explanatory diagram of an anchor fixing method according to the second embodiment of the present invention. FIG. 4 is a plan view of the anchor fixing clip 1 according to the third embodiment of the present invention. FIG. 5 is a diagram illustrating a general construction example (construction procedure) of a conventional shear reinforcement work performed on the ceiling portion of the frame.

  The present invention can be implemented as “anchor fixing clip” and also as a “method for fixing an anchor” using this clip. Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

  First, an “anchor fixing clip” will be described as a first embodiment of the present invention. FIG. 1 is a view showing an external configuration of an anchor fixing clip 1 according to the present invention. As shown in the drawing, this clip 1 is a metal wire (diameter 1.6 mm in diameter) having a basic shape “U”. And has two leg portions 2, 2, a connection portion 3, and two (a pair of) sandwiching portions 4, 4.

  The two sandwiching portions 4 and 4 are configured to face each other at a predetermined interval. In the present embodiment, both of the sandwiching portions 4 and 4 are formed so as to bulge outward, and both sides thereof (see FIG. 1 (1) (upper and lower), the neck portion (the neck portion 4b on the connecting portion 3 side and the neck portion 4c on the leg portion 2 side) formed so as to be bound inward. . As shown in FIG. 1, the spacing between the left and right bulging portions 4a and 4a is larger than the spacing between the left and right neck portions 4b and 4b and the spacing between the left and right neck portions 4c and 4c.

  The two legs 2 and 2 are also configured to face each other at a predetermined interval, and as shown in FIG. 1 (1), the front end side expands outward in a “C” shape toward the outside. It is configured. Further, as shown in FIG. 1 (2), when the holding portions 4 and 4 are held horizontally, the tip end side is inclined downward, so that the holding portions 4 and 4 In the case where the outer peripheral surface of the anchor is properly sandwiched therebetween and attached to the anchor, the leg portions 2 and 2 protrude in a direction inclined with respect to the axis of the anchor.

  The connecting portion 3 elastically connects the holding portions 4 and 4 as shown in the figure, and in this embodiment is formed in a “U” shape, but in a “C” shape. It may be a curved shape.

  The anchor fixing clip 1 according to the present embodiment has a very simple configuration as described above, and is extremely simple by simply bending a metal wire material as a raw material (without casting or welding). And can be manufactured at low cost. And, as will be described later, the anchor is to be fixed in the drilling hole, including the case where the anchor (shear reinforcement reinforcing bar, etc.) is inserted and fixed upward into the drilling hole formed upward from the ceiling surface of the frame. When doing, it can use suitably.

  Next, as a second embodiment of the present invention, an “anchor fixing method” (an application example to a shear reinforcement work for a ceiling portion of an existing concrete structure) will be described. FIG. 2 is an explanatory view of the “anchor fixing method” according to the present invention. As shown in FIGS. 2 (1) and 2 (2), first, two clips 1 and 1 ′ are attached to the anchor (in this embodiment). The top of the “shear reinforcing bar 11”) is in the opposite direction (a direction different by 180 ° about the axis of the shear reinforcing bar 11), and the tip side of the legs 2, 2 ′ is inclined downward. It is attached in a direction (in a direction protruding in a direction inclined with respect to the axis of the shear reinforcing bar 11).

  More specifically, the upper portion of the shear reinforcing bar 11 is sandwiched between the sandwiching portions 4 and 4 of the clip 1 and between the sandwiching portions 4 ′ and 4 ′ of the clip 1 ′. In addition, the clamping portions 4 and 4 of the clip 1 and the clamping portions 4 ′ and 4 ′ of the clip 1 ′ are overlapped with each other, and the clip 1 on the upper side of the two clips 1 and 1 ′. However, it is set as the state caught on the downward side of either rib 11a of the shear reinforcement bar 11 (refer to Drawing 2 (1) (2)).

  Then, as shown in FIG. 2 (3), the legs 2, 2 ′ of the clips 1, 1 ′ project radially from the center of the shear reinforcing bar 11, and the axis of the shear reinforcing bar 11 is aligned. As a reference, it protrudes outward from the connecting portion 3 (to a position further away from the axis of the shear reinforcing bar 11). As described above, the two clamping portions 4 and 4 of the clip 1 (and the two clamping portions 4 ′ and 4 ′ of the clip 1 ′) are configured to face each other at a predetermined interval as described above. Since the bulging portion 4a and the two neck portions 4b and 4c on both sides of the bulging portion 4a are formed, the outer peripheral surface of the shear reinforcing bar 11 can be stably held by the four contact points.

  When the clips 1 and 1 ′ are attached to the shear reinforcing bar 11, as shown in FIG. 2 (3), the leg portions 2 and 2 of the clip 1 and the connecting portion 3 ′ of the clip 1 ′ are connected to a binding material 12 (wire or the like). In the same way, the connecting portion 3 of the clip 1 and the leg portions 2 'and 2' of the clip 1 'are tied together by the binding material 12 and bound to each other. 11, the clips 1 and 1 ′ are not easily detached.

  Next, as shown in FIG. 3 (1), the shear reinforcing bar 11 with the clips 1, 1 ′ is opened in a hole 23 formed upward from the ceiling surface 22 of the housing 21. Insert upward from 23b. Note that when inserting the shear reinforcing bar 11, the inner wall of the hole 23 is preliminarily roughened, and the grout 24 is injected into the hole 23 in advance.

  As described above, the clips 1 and 1 ′ are in a state in which the leg portions 2 and 2 ′ project radially outward, and the tips of the leg portions 2 and 2 ′ are larger than the diameter of the hole 23. Since the clip 1, 1 ′ of the size to be opened is used, when the shear reinforcing bar 11 is to be inserted into the drilling hole 23 from the opening 23 b, as shown in FIG. Although the leg portions 2 and 2 ′ interfere with each other, the leg portions 2 and 2 ′ are inclined downward at the front end sides (that is, the leg portions 2 and 2 ′ are cut from the opening 23b. If the shear reinforcing bar 11 is pushed further upward from that state, the legs 2 and 2 'will be constricted by the opening 23b. Can be inserted without problems.

  When the shear reinforcement bar 11 is pushed further upward from the time when the entire clip 1, 1 ′ enters the drilling hole 23, the upper end of the shear reinforcement bar 11 is positioned at the hole 23, as shown in FIG. Until reaching the hole bottom 23a (the deepest part of the hole 23), the legs 2, 2 'that are constricted by the hole 23 are stretched outward by the restoring force, and the hole 23 Thus, the inside of the hole 23 is entered so as to scratch the inner wall (a large number of irregularities such as grooves are formed by the roughening process).

  However, when a reverse (downward) force is applied to the shear reinforcing bar 11, the tips of the leg portions 2, 2 ′ are caught by the irregularities on the inner wall of the hole 23, so that they do not move in the hole 23. The shear reinforcing bar 11 once inserted does not fall from the bore 23 even when a downward force is applied by gravity.

  In the conventional shear reinforcement work (see FIG. 5), a wedge is driven and temporarily fixed from the opening 23b side so that the shear reinforcement reinforcing bar 11 does not fall from the drilling hole 23 until the grout 24 is hardened. The wedge is removed after the grout 24 is cured, and then the final process (the process of closing the opening 23b with the mortar 25 (or grout) and finishing the surface) is performed. The fixing method according to this embodiment According to the present invention, it is not necessary to dispose or remove a fall prevention means such as a wedge on the side of the opening 23b. Further, the finishing process is performed before the grout 24 is cured (that is, without waiting for the grout 24 to be cured). ) For this reason, the construction period can be shortened and the construction cost can be reduced.

  Further, when the shear reinforcing bar 11 with the clips 1 and 1 ′ is inserted into the hole 23, the radially projecting legs 2 and 2 ′ are stretched against the inner wall of the hole 23. The shear reinforcing bar 11 can be held at the center position in the hole 23. Furthermore, since the clips 1 and 1 ′ can be easily attached at the construction site, the problem of an increase in the conveyance cost can be preferably avoided.

  2 and 3, for convenience of explanation, the clips 1 and 1 ′ are attached to a position close to the upper leg portion of the shear reinforcing bar 11, but the diameter of the shear reinforcing bar 11 is extended from the upper leg portion. It is preferable to attach to a position where a dimension (± 20%) corresponding to 5 times (nominal diameter) is placed.

  Moreover, in this embodiment, as one specific example of the anchor fixing method according to the present invention, an example of application to shear reinforcement work for the ceiling portion of an existing concrete structure (from the ceiling surface upward) In the case where a shear reinforcing bar or the like is inserted and fixed upward in the formed drilling hole), the method according to the present invention is applied to the inside of the drilled hole formed downward from the floor surface of the casing or the The present invention can also be suitably used when a shear reinforcing bar or other anchor is inserted and fixed in a hole formed laterally from the wall surface.

  Further, in the present embodiment, as described above, the clips 1 and 1 ′ that can stably hold the outer peripheral surface of the shear reinforcing bar 11 by the four contact points are used. However, as shown in FIG. The clip 1 (third embodiment of the present invention) in which the bulging portion 4a is formed only in one of the holding portions 4 and 4 and the shear reinforcing bar 11 is held by three contact points may be employed. it can.

1, 1 ': Anchor fixing clip,
2, 2 ': leg,
3, 3 ′: connecting part,
4, 4 ': clamping part,
4a: bulging part,
4b, 4c: neck part,
11: Shear reinforcement bar,
11a: rib,
12: Bundling material
21: skeleton
22: ceiling surface,
23: drilling,
23a: hole bottom,
23b: opening,
24: Grout,
25: mortar,

Claims (5)

A leg portion, a pair of clamping portions that clamp the outer peripheral surface of the anchor, and a connecting portion that elastically connects the pair of clamping portions;
When the outer peripheral surface of the anchor is properly clamped between the clamping parts and attached to the anchor, the leg part protrudes in a direction inclined with respect to the axis of the anchor, and more than the connecting part with respect to the anchor axis. An anchor-fixing clip configured to protrude outward.   The pair of sandwiching portions are configured to face each other at a predetermined interval, and at least one of them has a bulging portion formed to bulge outward. Item 2. The anchor fixing clip according to Item 1.   The anchor fixing clip according to claim 1 or 2, wherein the two leg portions are configured to face each other at a predetermined interval, and the tip end side is expanded. . A method for fixing an anchor in a drilling hole using the anchor fixing clip according to claim 1,
Two anchor-fixing clips whose size is such that the tip of the leg expands larger than the diameter of the drilling hole, so that the tip of the leg tilts toward one side in opposite directions around the axis of the anchor Attach to the anchor in any direction,
A method for fixing an anchor, wherein the leg portion is inserted into the drill hole in a direction inclined from the opening portion toward the outside of the drill hole.   5. The anchor fixing method according to claim 4, wherein a leg portion of one anchor fixing clip attached to the anchor and a connecting portion of the other anchor fixing clip are bound and bound by a binding material. .

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