JP2005299129A - Hole-in anchor bolt - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hole-in anchor bolt which can secure pull-out strength equivalent to that of an original anchor bolt. <P>SOLUTION: An anchor rod 2, where male screws 2a are formed at both ends, is inserted into a vertical hole 11a which is formed by penetrating a range from an upper surface of a concrete foundation 11 to a lower end surface thereof; on the side of the lower end surface of the concrete foundation 11, a lower end of the anchor rod 2, which is protruded from the lower end surface, is passed through a mounting hole 3a of a connecting plate 3; and after that, the male screw 2a on the side of the lower end of the anchor rod 2 is screwed into a nut 4, so as to be fastened to it. Subsequently, the grout G covers the lower end of the anchor rod 2, the connecting plate 3 and the nut 4, so as to be joined to the concrete foundation 11. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a post-installed anchor bolt.

  In general, as shown in FIG. 5, the anchor bolt 10 is incorporated at the same time as the rebar assembly of the concrete foundation 11, and is then integrated with the concrete foundation 11 by placing concrete. And after inserting the base S drilled in the anchor bolt 10 embed | buried under the concrete foundation 11, the base S is fixed by tightening a nut to the anchor bolt 10 via a washer.

  In constructing the concrete foundation 11, the discarded concrete 13 is placed after forming the split chestnut industry 12. The footing of the concrete foundation 11 is covered with the embankment 14.

  By the way, if the concrete is cast with the anchor bolts forgotten in the stage of assembling the reinforcing bars and formwork of the concrete foundation, the foundation and the pillar cannot be fixed. Moreover, an anchor bolt may be mistakenly planted in places other than a setting position, and it becomes difficult to fix a base and a pillar also in that case. Furthermore, after forming a concrete foundation, an anchor bolt may be additionally required depending on circumstances such as extension.

Thus, post-construction anchor bolts are widely adopted in response to situations where anchor bolts are required after the concrete foundation is formed. For example, as described in Patent Document 1, a post-construction anchor bolt is configured from a bolt having a tapered portion at the end and a sleeve having a tip extension portion, and a vertical hole is formed in a concrete foundation. A mechanical anchor bolt is known in which, while inserting a bolt and driving a sleeve into the bolt, the tip extension portion is pressed against the inner peripheral surface of a hole along the taper portion of the bolt, and the diameter is expanded and fixed. Although not described in detail, a post-installed anchor bolt called a chemical anchor is also known.
JP-A-6-65931 (FIG. 4)

  By the way, post-installed anchor bolts are inferior to the original anchor bolts that are incorporated at the same time as the reinforcement of the concrete foundation and integrated with the concrete foundation. There was a drawback that it could not be secured.

  This invention is made | formed in view of such a problem, and provides the post-installed anchor bolt which can ensure the pulling-out strength equivalent to the original anchor bolt.

  The present invention is provided with an anchor rod that is inserted through a vertical hole formed through from the top end surface to the lower end surface of a concrete foundation, male threads are formed at both ends, and a mounting hole that can be inserted into the anchor rod. A connecting plate inserted into the lower end portion of the anchor rod protruding from the lower end surface of the anchor rod, a nut that is fastened to a male screw on the lower end side of the anchor rod and holds the connecting plate, and a lower end portion of the anchor rod, the connecting plate and the nut The anchor rod is fixed to the concrete foundation via a connecting plate. The grout is covered and joined to the concrete foundation.

  According to the present invention, after forming a vertical hole having an inner diameter corresponding to the outer diameter of the anchor rod from the top end surface to the lower end surface of the concrete foundation, the anchor rod is inserted into the vertical hole, and the connecting plate is attached to the lower end portion thereof. Along with the insertion of the hole, a nut is screwed into the male screw on the lower end side and tightened to adjust the protruding amount of the anchor rod from the top end surface of the concrete foundation. At this time, so as not to hinder the work, the embankment near the vertical hole, the abandoned concrete, and the split chestnut industry are removed beforehand. Next, the anchor rod is supported in a state where the connecting plate is in contact with the lower end surface of the concrete foundation, and the grout is joined to the lower end surface of the concrete foundation covering the lower end portion of the anchor rod, the connecting plate and the nut. Also, grout is filled in the gap so that the anchor rod does not move in the gap between the inner peripheral surface of the vertical hole and the outer peripheral surface of the anchor rod. After this, if the grout has hardened, restore the groundwork.

  As a result, the anchor rod is fixed to the concrete foundation via the connecting plate, so that the anchor rod has the same pulling strength as the original anchor bolt integrated with the concrete foundation, and the necessary strength can be secured. It is possible to cope with forgetting to put the anchor bolt, planting the anchor bolt in the wrong position, adding an anchor bolt, or the like.

  Here, if the inner diameter of the vertical hole is slightly larger than the outer diameter of the anchor rod, the position of the anchor rod can be adjusted within the range of the vertical hole.

  The present invention is inserted into a vertical hole formed from the top end surface of the concrete foundation to a midway position, a through hole is formed at the lower end portion, and an anchor rod having a male screw formed at the upper end portion, and communicated with the vertical hole of the concrete foundation. And a connecting member that is inserted through a through hole formed from one side surface to the other side surface and inserted through the through hole of the anchor rod, and a grout that covers the connecting member and is joined to the concrete foundation. Thus, the anchor rod is fixed to the concrete foundation via the connecting member.

  According to the present invention, a vertical hole having an inner diameter corresponding to the lower end portion of the anchor rod is formed from the top end surface of the concrete foundation to a set depth, and the bottom of the vertical hole is matched to the depth of the vertical hole formed in the concrete foundation. A side hole is formed from one side of the concrete foundation to the other side so as to communicate with the other side. Next, the anchor rod is inserted into the vertical hole of the concrete foundation, while a connecting member such as a bolt or a pin is inserted into the horizontal hole, and the connecting member is inserted into the through hole formed at the lower end of the anchor rod. Next, the grout is filled in the gap between the inner peripheral surface of the lateral hole of the concrete foundation and the outer peripheral surface of the connecting member, and the connecting member is covered and joined to the lateral hole of the concrete foundation. Moreover, grout is filled also into this clearance gap so that an anchor rod may not move by the clearance gap between the internal peripheral surface of the vertical hole of a concrete foundation, and the outer peripheral surface of an anchor rod.

  As a result, the anchor rod is fixed to the concrete foundation via the connecting member, so that it has the same pulling strength as the original anchor bolt integrated with the concrete foundation, and the necessary strength can be ensured. It is possible to cope with forgetting to put the anchor bolt, planting the anchor bolt in the wrong position, adding an anchor bolt, or the like.

  The present invention is inserted into a vertical hole formed from the top end surface of the concrete foundation to an intermediate position, and is connected to the vertical hole of the concrete foundation with an anchor rod formed with male threads at both ends, and from one side to the bottom of the vertical hole The nut is inserted into a horizontal hole formed up to a position exceeding the upper end of the anchor rod and fastened to the male screw on the lower end side of the anchor rod, and a grout that covers the nut and is joined to the concrete foundation. The anchor rod is connected to the concrete through the nut. It is characterized by being established in the foundation.

  According to the present invention, the vertical hole having the inner diameter corresponding to the outer diameter of the anchor rod is formed from the top end surface of the concrete foundation to the set depth, and the vertical hole is formed in accordance with the depth position of the vertical hole formed in the concrete foundation. A lateral hole having a size capable of inserting a nut from one side surface of the concrete foundation to a position beyond a certain length beyond the bottom of the vertical hole is formed so as to communicate with the bottom. Next, the nut is inserted from the horizontal hole of the concrete foundation to the position directly below the vertical hole, while the anchor rod is inserted into the vertical hole, and the male screw on the lower end side is screwed into the nut and fastened. After this, grout is filled into the side hole of the concrete foundation, and the nut is covered and joined to the side hole of the concrete foundation. Also, grout is filled in the gap so that the anchor rod does not move in the gap between the inner peripheral surface of the vertical hole and the outer peripheral surface of the anchor rod.

  As a result, the anchor rod is fixed to the concrete foundation via the nut, so that it has the same pulling strength as the original anchor bolt integrated with the concrete foundation, and the necessary strength can be ensured. It is possible to cope with forgetting to put the anchor bolt, planting the anchor bolt in the wrong position, adding the anchor bolt, and the like.

  According to the present invention, a post-installed anchor bolt having a strength equivalent to that of an original anchor bolt integrated with concrete in advance can be obtained.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 and FIG. 2 show Example 1 of a post-installed anchor bolt 1.

  This post-installed anchor bolt 1 has male screws 2 a formed at both ends, and a connecting plate 3 having an anchor rod 2 having a length sufficiently exceeding the height of the concrete foundation 11 and an attachment hole 3 a that can be inserted into the anchor rod 2. And a nut 4 that can be screwed into the male thread 2a of the anchor rod 2.

  When constructing the construction anchor 1, first, the embankment 14, the discarded concrete 13, and the split chestnut industry 12 in the vicinity where the post-construction anchor bolt 1 is constructed are removed in advance and prepared so as not to hinder the work. A vertical hole 11 a having an inner diameter slightly larger than the outer diameter of the anchor rod 2 is formed from the top end surface to the lower end surface of the concrete foundation 11. Next, the anchor rod 2 is inserted into the vertical hole 11 a of the concrete foundation 11, the attachment hole 3 a of the connecting plate 3 is inserted into the lower end portion of the anchor rod 2 on the lower end surface side of the concrete foundation 11, and then the nut 4 is inserted into the male screw 2 a. Screw in and tighten. At this time, the amount of protrusion of the anchor rod 2 from the top end surface of the concrete foundation 11 is adjusted. Thereafter, the anchor rod 2 is supported with the connecting plate 3 in contact with the lower end surface of the concrete foundation 11, and the grout G is anchored to prevent the anchor rod 2, the connecting plate 3 and the nut 4 from being rusted. The lower end of the rod 2, the connecting plate 3 and the nut 4 are covered and filled, and joined to the lower end surface of the concrete foundation 11. In addition, the grout G is filled in the gap between the inner peripheral surface of the vertical hole 11 a of the concrete foundation 11 and the outer peripheral surface of the anchor rod 2. When the grout G is hardened, the cut chestnut industry 12 is constructed, and after the discarded concrete 13 is cast, the embankment 14 is restored.

  As a result, the anchor rod 2 is fixed to the concrete foundation 11 via the connecting plate 3, so that it has a pulling strength equivalent to that of the original anchor bolt, and the necessary strength can be ensured. Therefore, it is possible to cope with forgetting to insert the anchor bolt, planting the anchor bolt at a wrong position, adding the anchor bolt, and the like.

  In addition, in the post-construction anchor bolt 1 described above, after the concrete foundation 11 is formed, the vertical hole 11a is formed in the concrete foundation 11 and the post-construction anchor bolt 1 is provided. For example, when an extension is expected at a later date, a hole may be formed in the concrete foundation 11 in advance in accordance with the position where the foundation and the pillar are connected. it can. Specifically, by attaching a sheath tube to the reinforcing bar of the concrete foundation 11 in advance and placing the concrete to form the concrete foundation 11, the sheath tube can be embedded in the vertical direction of the concrete foundation 11, The post-construction anchor bolt 1 can be attached using In this case, there is no need to form the vertical hole 11a in the concrete foundation 11, and there is an advantage that the operation can be performed quickly.

  Example 2 of the post-installed anchor bolt 1 shown in FIG. 3 includes an anchor rod 2A formed by welding a block 22 having a through hole 22a formed at the other end of the rod 21 having a male screw 21a formed at one end thereof. It is composed of a connecting member 5 such as a pin or a bolt that can be inserted into the through hole 22a of the anchor rod 2A.

  When constructing the post-installed anchor bolt 1, first, a vertical hole 11 a having a hole diameter into which the block 22 of the anchor rod 2 </ b> A can be inserted is formed from the top end surface of the concrete foundation 11 over a set depth. Next, a horizontal hole 11b is formed from one side of the concrete foundation 11 to the other side so as to match the depth of the vertical hole 11a formed in the concrete foundation 11 and communicate with the bottom of the vertical hole 11a. Next, the anchor rod 2A is inserted into the vertical hole 11a of the concrete foundation 11, while the connecting member 5 is inserted into the horizontal hole 11b, and the connecting member 5 is inserted into the through hole 22a formed in the anchor rod 2A. Next, in order to prevent rust from being generated in the connecting member 5, the grout G is filled in a gap between the inner peripheral surface of the horizontal hole 11 b of the concrete foundation 11 and the outer peripheral surface of the connecting member 5, and the connecting member 5 is covered to provide concrete. The base 11 is joined to the lateral hole 11b. Also, grout G is filled in the gap so that anchor rod 2A does not move in the gap between the inner circumferential surface of vertical hole 11a of concrete foundation 11 and the outer circumferential surface of anchor rod 2A.

  As a result, the anchor rod 2 </ b> A is fixed to the concrete foundation 11 via the connecting member 5, so that it has the same pulling strength as the original anchor bolt, and the necessary strength can be ensured. Therefore, it is possible to cope with forgetting to insert the anchor bolt, planting the anchor bolt at a wrong position, adding the anchor bolt, and the like.

  A third embodiment of the post-installed anchor bolt 1 shown in FIG. 4 includes an anchor rod 2 having male threads 2a formed at both ends, and a nut 4A that can be screwed into the male threads 2a of the anchor rod 2.

  Here, the outer diameter of the nut 4 </ b> A is sufficiently larger than the inner diameter of the vertical hole 11 a formed in the concrete foundation 11.

  When constructing the construction anchor 1, first, a vertical hole 11 a having an inner diameter slightly larger than the outer diameter of the anchor rod 2 is formed from the top end surface of the concrete foundation 11 over a set depth. Next, in accordance with the depth of the vertical hole 11a formed in the concrete foundation 11 and so as to communicate with the bottom of the vertical hole 11a, from one side of the concrete foundation 11 to a position exceeding the bottom of the vertical hole 11a by a certain length. A lateral hole 11b having a size capable of inserting the nut 4A is formed. Next, the nut 4A is inserted from the horizontal hole 11b of the concrete foundation 11 to a position directly below the vertical hole 11a, while the anchor rod 2 is inserted into the vertical hole 11a, and the male screw 2a on the lower end side is screwed into the nut 4A and fastened. Thereafter, in order to prevent the rust from being generated in the nut 4A, the grout G is filled in the lateral hole 11b of the concrete foundation 11, and the nut 4A is covered and joined to the lateral hole 11b of the concrete foundation 11. Further, the grout G is also filled in the gap so that the anchor rod 2 does not move in the gap between the inner peripheral surface of the vertical hole 11 a of the concrete foundation 11 and the outer peripheral surface of the anchor rod 2.

  As a result, since the anchor rod 2 is fixed to the concrete foundation 11 via the nut 4A, the anchor rod 2 has a pulling strength equivalent to that of the original anchor bolt, and the necessary strength can be ensured. Therefore, it is possible to cope with forgetting to insert the anchor bolt, planting the anchor bolt at a wrong position, adding the anchor bolt, and the like.

  As described above, according to the present invention, even after the concrete foundation is formed, it is possible to attach the post-construction anchor bolt having the same pulling strength as the original anchor bolt, forgetting to put the anchor bolt, the anchor It is possible to cope with the installation of bolts at wrong positions, the addition of anchor bolts, and the like.

It is a front side longitudinal cross-sectional view which shows Example 1 of the post-installed anchor bolt of this invention. It is the sectional view on the AA line of FIG. It is a side surface side longitudinal cross-sectional view which shows Example 2 of the post-installed anchor bolt of this invention. It is a side surface side longitudinal cross-sectional view which shows Example 3 of the post-installed anchor bolt of this invention. It is a perspective view which shows the conventional anchor bolt with a concrete foundation.

Explanation of symbols

1 Post-installed anchor bolt 2, 2A Anchor rod 3 Connecting plate 4, 4A Nut 5 Connecting member 11 Concrete foundation 11a Vertical hole 11b Horizontal hole

Claims (3)

  An anchor rod with a male thread formed on both ends and a mounting hole that can be inserted into the anchor rod are formed through the vertical hole formed through the top and bottom surfaces of the concrete foundation. A connecting plate inserted into the lower end of the protruding anchor rod, a nut fastened to the male screw on the lower end side of the anchor rod, and holding the connecting plate, and a concrete foundation covering the lower end of the anchor rod, the connecting plate and the nut A post-installed anchor bolt, characterized in that the anchor rod is fixed to the concrete foundation via a connecting plate.   It is inserted into a vertical hole formed from the top end surface of the concrete foundation to a middle position, and a through hole is formed at the lower end, while communicating with an anchor rod with an external thread formed at the upper end, and a vertical hole in the concrete foundation, An anchor rod comprising: a connecting member inserted through a lateral hole formed through one side to the other side, and inserted into a through hole of the anchor rod; and a grout covering the connecting member and joined to a concrete foundation. A post-installed anchor bolt characterized in that is fixed to a concrete foundation via a connecting member.   Inserted into a vertical hole formed from the top end surface of the concrete foundation to a midway position, with an anchor rod with male threads formed at both ends, and communicated with the vertical hole in the concrete foundation, from one side to the position beyond the bottom of the vertical hole It consists of a nut inserted into the formed horizontal hole and fastened to the male screw on the lower end side of the anchor rod, and a grout that covers the nut and is joined to the concrete foundation, and the anchor rod is fixed to the concrete foundation via the nut Post-installed anchor bolt characterized by that.

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