JP7195114B2 - Anchor bolt fixing member, anchor bolt set using the same, and anchor bolt fixing member fixture - Google Patents

Description

The present invention relates to an anchor bolt fixing member, an anchor bolt set using the same, and an anchor bolt fixing member fixture.

In the construction of civil engineering infrastructure structures such as concrete bridges, viaducts, tunnels, and dams, as well as building structures such as buildings, halls, and factories, it is used to connect foundations and structures, as well as walls and walls of structures. Anchor bolts are used to fix attachments such as pipes, signs, overhead wires, inspection paths, and machines to pillars, ceilings, dirt floors, and the like. Anchor bolts are usually embedded in concrete for construction, and the structures and accessories are fixed to the anchor bolts.

This anchor bolt construction method is roughly classified into a pre-installed anchor bolt construction method and a post-installed anchor bolt construction method.

The pre-installed anchor bolt construction method is a construction method in which anchor bolts are installed before the concrete is poured, and the concrete is poured and embedded into the bolts. This is a construction method in which holes are drilled in the concrete later, and anchor bolts are fixed there.

In the post-installed anchor bolt construction method, holes are drilled in the concrete in advance to fix the anchor bolts, and the holes are filled with an organic adhesive such as epoxy, acrylic, or polyester, or an inorganic adhesive such as cement. After that, an adhesion method in which an anchor bolt is inserted and fixed, a metal expansion anchor construction method in which the tip of the anchor bolt expands when the bottom of the anchor bolt touches the bottom of the drilled hole and bites into the drilled concrete surface to mechanically fix it, There is also a bottom expansion anchor bolt construction method in which the bottom of a drilled hole is expanded with a special drill to expand the bottom of the anchor itself, a so-called metal expansion bottom anchor construction method.

Furthermore, in the post-applied anchor bolt adhesion construction method, the two-component curing adhesive is enclosed in a glass or resin capsule, and after inserting the capsule into the drilled hole, the anchor bolt is driven in while rotating, and the adhesive encapsulated capsule is formed. There is also a bonding type anchor bolt fixing method in which the two liquid resin is destroyed and the enclosed two-liquid resin is agitated and reacted to fix the anchor bolt.

As described above, there are various methods for constructing anchor bolts, but in repair and reinforcement work, there are many cases in which sufficient strength cannot be expected due to deterioration of concrete over time. Power may not be guaranteed. For this reason, a post-installation anchor bolt construction method is often used, in which a hole is drilled in concrete to a predetermined depth, an adhesive is filled, and an anchor bolt is inserted and fixed. The embedding depth of such a post-installed anchor bolt is generally about 8 to 15 times the diameter of the anchor bolt, and it is said that the fixing force of the anchor bolt can be secured by this predetermined bonding area.

In such a post-installed anchor bolt construction method, the diameter of the drill hole is set with a clearance larger than the diameter of the anchor bolt by the thickness of the adhesive filling. However, especially when the construction is directed downward or sideways, as shown in FIG. Otherwise, the anchor bolt 2 is displaced downward due to its own weight and comes into contact with the wall surface before the adhesive hardens, and the adhesive does not spread around the entire circumference of the anchor bolt 2.

If the anchor bolt installed in such a state continues to bear the load for a long period of time, or if repeated load bearing occurs due to vibration, etc., the fatigue of the adhesive will lead to the anchor bolt coming off. possibility has been pointed out. In addition, when fixing structures and attachments to anchor bolts, if the anchor bolts are fixed in a tilted state, the nuts and washers will also tilt, making it difficult to fix the structures and attachments. was there.

Furthermore, when anchor bolts are installed upward on the ceiling surface of a tunnel or the like, if the adhesive is not sufficiently hardened, the anchor bolts 2 move downward due to their own weight, as shown in FIG. 15(A). Sufficient adhesive strength may not be expected. Therefore, as shown in FIG. 15(B), it is necessary to temporarily hold the anchor bolt 2 until the adhesive is sufficiently hardened, which significantly reduces the construction efficiency.

As a method for solving such inconveniences, members for post-installed anchor bolt construction methods have been proposed so far (see Patent Documents 1 and 2, for example). In the proposal of Patent Document 1, the point where the tip of the anchor bolt touches the bottom of the hole expands and bites into the wall surface of the hole to bear its own weight. This avoids the risk of anchor bolts falling off due to their own weight even under vibration or in cold weather when the adhesive hardens slowly, and the risk of anchor bolts being insufficiently fixed before the anchor fixing agent has sufficiently hardened. In addition, it is possible to reinforce the pull-out resistance of the anchor bolt.

Further, in the proposal of Patent Document 2, in a state in which the anchor bolt is mounted, an arc-shaped base portion surrounding the shaft portion over a range of not less than half the circumference and less than the entire circumference along the circumferential direction of the shaft portion, and a pair of arc-shaped base portions connected to the base portion By using the anchor bolt assisting tool having the legs, the anchor bolt assisting tool can be easily attached to the anchor bolt, and furthermore, the attachment position of the anchor bolt assisting tool can be easily adjusted.

JP 2011-247049 A Japanese Unexamined Patent Application Publication No. 2016-211180

However, the proposal of Patent Literature 1 does not solve the problem of tilting of the anchor bolt in the borehole. In addition, if the strength of the concrete where the tip expansion part contacts the hole wall is weak, the fixing force will decrease, and if the hole diameter is larger than the specified diameter and the hole is incorrectly constructed, the wedge effect will be sufficient even if the anchor expands. is not demonstrated in In addition, if the drilling depth is deeper than the specified setting, there is a problem that the cone cannot be inserted sufficiently and the expansion of the tip of the anchor bolt is insufficient, so that the yield strength of the anchor cannot be expected. rice field. Furthermore, when a load is repeatedly applied to the anchor bolt, there is a problem that the anchor bolt wobbles and eventually falls off unless the clearance between the hole wall and the anchor bolt is filled with an adhesive or the like.

Further, in the proposal of Patent Document 2, the portion of the anchor bolt auxiliary tool attached to the anchor bolt has an arc shape surrounding the shaft over a range of not less than half the circumference and less than the entire circumference along the circumferential direction of the shaft, Since the mounting portion is small, the mounting force is small and unstable, and there is a problem that the anchor bolt assisting tool is easily pulled out of the anchor bolt.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and is capable of easily and reliably installing an anchor bolt in the center of a drilled hole, preventing the anchor bolt from falling out due to its own weight, and furthermore, providing an adhesive for the anchor bolt. To provide an anchor bolt fixing member capable of maintaining pull-out resistance even when the force is lost, an anchor bolt set using the same, and an anchor bolt fixing member fixture, and to easily remove the anchor bolt fixing member. An object of the present invention is to provide a fixing member fixture for an anchor bolt that can be attached to an anchor bolt set to manufacture an anchor bolt set.

A fixing member for anchor bolts, an anchor bolt set using the same, and a fixing member fixture for anchor bolts of the present invention have been made to solve the above technical problems, and are characterized by the following. .

Firstly, the anchor bolt fixing member of the present invention is an anchor bolt fixing member for fixing an anchor bolt having threads on its outer surface to a hole formed in a concrete member. includes a coil spring portion to be screwed onto the thread of the anchor bolt, and a pair of return portions provided at both ends of the coil spring portion and bent at an angle in one direction with respect to the coil spring portion. , at least a portion of the inner diameter of the coil spring portion is equal to or smaller than the outer diameter of the anchor bolt, and the wire diameter of the wire constituting the coil spring portion is such that the coil spring portion is screwed into the thread of the anchor bolt. At least a portion of the wire rod is set so as to come into contact with the flanks of the adjacent screw threads in the folded state.

Secondly, in the anchor bolt fixing member of the first aspect of the invention, it is preferable that the pair of return portions are provided so as to face each other when screwed onto the anchor bolt. .

Third, in the anchor bolt fixing member of the first or second invention, the inner diameter of one end of the coil spring portion is smaller than the inner diameter of the other end, and the inner diameter of the other end is the same as the anchor. It is preferable that the inner diameter of the one end portion is equal to or larger than the outer diameter of the bolt and smaller than the outer diameter of the anchor bolt.

Fourthly, in the anchor bolt set of the present invention, the anchor bolt fixing member is attached to the anchor bolt, and the anchor bolt fixing member is attached to the anchor bolt when the anchor bolt is inserted into the hole. is attached so that the return portion of the hole is directed toward the insertion opening of the hole.

Fifth, in the anchor bolt set of the fourth aspect of the invention, it is preferable that the central axis of the anchor bolt is hollow pipe-shaped.

Sixthly, in the anchor bolt set of the fourth or fifth invention, it is preferable that a plurality of the anchor bolt fixing members are attached to the anchor bolt.

Seventh, in the anchor bolt set according to any one of the above fourth to sixth aspects, the protrusion width of the return portion is 1/1 of the difference between the outer diameter of the anchor bolt and the diameter of the drilled hole. It is preferably set to be greater than two.

Eighth, the fixture for fixing members for anchor bolts of the present invention comprises a base, an insertion hole into which the coil spring portion penetrating the base can be inserted, and the pair of barbs provided on the inner wall of the insertion hole. An insertion member having a return portion fixing groove into which the portion can be fitted, the coil spring portion is inserted into the insertion hole, and the pair of return portions are fitted into the return portion fixing groove to fix the anchor bolt. The anchor bolt can be easily screwed into the anchor bolt fixing member in a state where the member is fixed.

Ninthly, in the fixing member fixture for anchor bolts of the eighth invention, the base is a cylindrical body, the insertion hole at one end and the return portion fixing groove at the inner wall portion, and at the other end An insertion member having a connecting portion connectable to a rotating device is provided, and the coil spring portion is inserted into the insertion hole, and the pair of return portions are fitted into the return portion fixing groove to provide the anchor bolt fixing member. is fixed, the connecting portion is connected to a rotating device, and the anchor bolt fixing member can be screwed into the anchor bolt by rotating the base portion while abutting the end portion of the anchor bolt. preferably.

According to the present invention, the anchor bolt can be easily and reliably installed at the center of the drilled hole, the anchor bolt can be prevented from falling off due to its own weight, and the pull-out strength can be maintained even when the adhesive of the anchor bolt loses its adhesive strength. It is possible to provide an anchor bolt fixing member, an anchor bolt set using the same, and an anchor bolt fixing member fixture.

In addition, it is possible to provide an anchor bolt fixing member fixture that allows the anchor bolt fixing member to be easily attached to the anchor bolt to manufacture an anchor bolt set.

(A) is a perspective view showing an embodiment of the anchor bolt fixing member of the present invention, and (B) is a top view thereof. (A) is a partial plan view showing a state in which a fixing member for an anchor bolt of the present invention is screwed onto a thread of an anchor bolt, and (B) is a top view thereof. FIG. 5 is a cross-sectional view showing a contact state between the thread of the anchor bolt and the wire rod of the coil spring portion; FIG. 10 is a photograph showing an embodiment of a fastening member for an anchor bolt having a borage shape with hyperboloids; FIG. FIG. 4 is a partial plan view showing an embodiment in which the tip of the return portion is obliquely cut; 1 is a plan photograph showing an embodiment of an anchor bolt set of the present invention; (A) is a plan photograph showing an embodiment of an anchor bolt having a hollow pipe-like central axis, and (B) is a plan photograph showing an embodiment in which a notch is provided at the tip. (A) is a plan view showing a state in which two anchor bolt fixing members are brought into contact with each other vertically and attached to the anchor bolt, and (B) is a plan view showing a state in which a spring is brought into contact under the anchor bolt fixing member. It is a top view which shows the state attached to the anchor bolt. (A) is a perspective view showing an embodiment of an insertion member of the present invention, and (B) is a perspective view illustrating how the insertion member is used to attach a fixing member fixture for anchor bolts. FIG. 10 is a perspective view showing an embodiment of an anchor bolt fixing member fixture capable of attaching three, three anchor bolt fixing members at the same time; FIG. 4 is a perspective view showing another embodiment of the insert member of the present invention; Figure 12 is a cross-sectional front view of a fastener fixture for an anchor bolt with the insert of Figure 11; FIG. 4 is a schematic explanatory diagram showing one embodiment of the installation procedure of the anchor bolt set of the present invention; (A) and (B) are schematic sectional views showing a conventional state in which anchor bolts are installed downward from a foundation or the like. (A) and (B) are schematic cross-sectional views showing a conventional state in which anchor bolts are installed upward from a ceiling surface or the like. It is a whole photograph of the concrete member used in the example. It is a schematic top view which shows the punching position of an Example. It is a schematic side view which shows the installation state of the measuring device of an Example.

The anchor bolt fixing member of the present invention will be described in detail below with reference to the drawings. FIG. 1 shows an embodiment of the anchor bolt fixing member of the present invention, and FIG. 2 shows a state in which the anchor bolt fixing member of the present invention is screwed onto the threads of the anchor bolt.

Anchor bolt fixing member 1 of the present invention is an anchor bolt fixing member 1 for fixing an anchor bolt 2 having threads 20 on its outer surface to a hole 51 formed in a concrete member 5. A coil spring portion 10 to be screwed onto a screw thread 20 and a pair of return portions 12 provided at both ends of the coil spring portion 10 and bent with an angle in one direction with respect to the coil spring portion 10 are provided. .

The coil spring portion 10 of the anchor bolt fixing member 1 is a tension spring for firmly fixing the anchor bolt fixing member 1 to the anchor bolt 2, and is preferably tightly wound. At least a portion of the inner diameter of the coil spring portion 10 is set to be equal to or less than the outer diameter of the anchor bolt 2 . Specifically, for example, setting the inner diameter of the coil spring portion 10 equal to or smaller than the outer diameter of the anchor bolt 2 to a dimension smaller than the outer diameter of the anchor bolt 2 by 5 to 20% is considered. As a result, when the anchor bolt fixing member 1 is attached to the anchor bolt 2, the coil spring portion 10 can press the anchor bolt 2 toward the center with a uniform force from the outer circumference. can be prevented from coming off or shifting from the anchor bolt 2.

Moreover, the wire diameter of the wire rod 11 constituting the coil spring portion 10 is such that at least a portion of the wire rod 11 is as shown in FIG. , the flanks 21 of the screw threads 20 that are vertically adjacent to each other. The wire diameter of the wire rod 11 is appropriately determined according to the height and pitch of the male screw thread 20 formed on the outer circumference of the anchor bolt 2 to be screwed, and is not particularly limited. In the case where the standard of the bolt 2 is M8 to M24, it is considered that the wire diameter of the wire rod 11 is 1.2 to 3.5 mm or less as shown in Table 1. Moreover, it is particularly desirable that the pitch of the thread 20 of the anchor bolt 2 and the wire diameter of the wire rod 11 are set to be the same. By setting this condition, the pitch of the screw thread 20 and the pitch of the coil spring portion 10 are matched, so that the anchor bolt fixing member 1 can be smoothly screwed into the anchor bolt 2, and can be removed after installation. and loosening can be reliably prevented.

In addition, in the anchor bolt fixing member 1 of the present embodiment, the inner diameter of one end of the coil spring portion 10 is smaller than the inner diameter of the other end, and the inner diameter of the other end is greater than or equal to the outer diameter of the anchor bolt 2 ( It is preferable that the inner diameter of one end is smaller (narrower) than the outer diameter of the anchor bolt 2 . As a specific shape of the coil spring portion 10, for example, a morning glory shape having a hyperboloid as shown in FIG. 4 can be exemplified. Specific diameter dimensions of this embodiment can be set to the dimensions for the standards M8, M10, and M20 of the anchor bolt 2 shown in Table 1.

By setting the inner diameter of one end of the coil spring portion 10 wider than the outer diameter of the anchor bolt 2 in this manner, the anchor bolt 2 can be easily inserted from one end of the wide coil spring portion 10 and easily screwed. can. The inner diameter of the other end portion, which is larger than the inner diameter of the one end portion, is usually set to a dimension similar to the outer diameter of the anchor bolt 2. However, in order to further facilitate screwing to the anchor bolt 2, It can also be 5-10% larger than the inner diameter of one end.

Furthermore, the initial tension of the coil spring portion 10 can also be defined in order to achieve stronger fixation of the anchor bolt fixing member 1 to the anchor bolt 2 . The greater the initial tension of the coil spring portion 10, the stronger the force that presses the flanks 21 of the male screw thread 20 of the anchor bolt 2 from both sides, enabling firm fixation. Specifically, for example, when one end of the coil spring portion 10 having a wire diameter of M8 and a wire diameter of 1.2 mm is fixed and the other end is connected to a load measuring device and pulled, the load (kgf) with respect to the displacement (mm) is measured. In measurement, the average spring constant at a displacement of 1 to 5 mm is preferably 1.0 to 1.5 kgf/mm, preferably about 1.2 kgf/mm.

In the anchor bolt fixing member 1 of the present invention, a pair of return portions 12 are provided at both ends of the coil spring portion 10 and bent with an angle in one direction with respect to the coil spring portion 10 . Although the angle of the bent return portion 12 is not particularly limited, for example, as shown in FIGS. A range of 10° to 45° is preferable.

Moreover, as shown in FIG. 5, it is preferable to cut the tip of the return portion 12 obliquely. The cutting angle θ of the tip is not particularly limited, but if the cutting angle θ of the tip of the return portion 12 is too sharp, the tip may be bent and the yield strength may be reduced when it bites into the inner wall surface of the perforation due to the external pull-out force. Therefore, the cutting angle θ is preferably in the range of 30 to 90°. As a result, the tip of the return portion 12 reliably bites into the concrete inner wall surface of the hole 51, and the anchor bolt 2 can be more reliably prevented from coming off.

Moreover, it is preferable that the pair of return portions 12 are provided so as to face each other at an angle of 180° when screwed onto the anchor bolt 2, as shown in FIG. 2(B). In order to achieve such a position, the number of turns of the coil spring portion 10 is set with a shift of 0.5 turns, such as 2.5 turns or 3.5 turns. Considering the ease of screwing and the strength when screwed together, it is preferably about 2.5 to 5.5 turns, more preferably about 3.5 turns.

In this way, by providing the pair of return portions 12 so as to face each other at 180° positions while being screwed to the anchor bolt 2, the perforations provided perpendicular to the ground in each direction can be obtained. In addition to the hole 51, the anchor bolt 2 can always be arranged in the center of the hole 51 even when it is inserted into the hole 51 provided horizontally or diagonally with respect to the ground.

As shown in FIG. 6, the anchor bolt fixing member 1 of this embodiment is used as an anchor bolt set 3 in a state where it is screwed onto the anchor bolt 2 and attached.

The anchor bolt fixing member 1 is attached to the anchor bolt 2 so that when the anchor bolt 2 is inserted into the concrete hole 51, the pair of barbs 12 face the insertion opening direction of the hole 51 during construction. be done.

In addition, in the anchor bolt set 3 of the present embodiment, if the projection width of the barbed portion 12 is the width at which the tip of the barbed portion 12 contacts the inner wall of the borehole 51, the relationship between the diameter of the borehole 51 and the diameter of the anchor bolt 2 is However, it is necessary that the tip of the return portion 12 comes into contact with the inner wall of the perforation 51 without fail. Therefore, it is preferable that the protrusion width of the return portion 12 is set larger than 1/2 of the difference between the outer diameter of the anchor bolt 2 and the diameter of the bore 51 . This makes it possible for the tip of the return portion 12 to reliably contact and bite into the inner wall of the perforation 51 to prevent it from coming off.

In addition, in the anchor bolt set 3 of the present embodiment, as shown in FIG. 7A, the center axis of the anchor bolt 2 can be hollow pipe-shaped. In the post-installed anchor bolt construction method, in order to fix the anchor bolt 2, after drilling a hole in the concrete, an organic adhesive such as epoxy, acrylic, polyester, etc., or cement-based inorganic adhesive is usually filled. , the anchor bolt 2 is inserted and fixed by adhesion, but especially in the case of upward construction, air may be caught in the ceiling of the perforation 51 and the filling may be insufficient, or the adhesive may sag downward due to its own weight before it hardens. A phenomenon may occur in which a cavity is formed in the perforation 51 and the adhesive does not spread over the entire surface of the inserted anchor bolt 2 . Further, when the anchor bolts 2 are installed in underwater construction or the like, the drilling itself is performed underwater, and even if an attempt is made to inject (fill) the adhesive after drilling the hole, it is difficult to replace it with water. At this time, the pipe-shaped anchor bolt 2 having a hollow center axis is first inserted into the hole 51, and then the injection material is discharged from the tip of the anchor bolt 2 in contact with the bottom of the hole, and gradually replaced with water. The problem can be solved by injecting

Moreover, in the anchor bolt set 3 of the present embodiment, a plurality of anchor bolt fixing members 1 can be attached to the anchor bolt 2 . In this case, it is more preferable to attach the pair of return portions 12 of the upper and lower anchor bolt fixing members 1 so as to be shifted by 90° from each other. As a result, the tip of the return portion 12 comes into contact with the inner wall of the hole 51 every 90°, so that the anchor bolt 2 can be arranged in the center of the hole 51 more stably.

Furthermore, as shown in FIG. 8(A), it is preferable that the fixing members 1 for anchor bolts are attached so as to be in contact with each other at the top and bottom to form a set, and a plurality of sets of the set are installed. As a result, when an external force is applied to pull out the anchor bolt 2, the lower return portion 12 of the upper anchor bolt fixing member 1 is pressed by the upper end portion of the coil spring portion 10 of the lower anchor bolt fixing member 1. It is possible to prevent downward displacement and increase the pull-out resistance.

Further, in order to prevent further downward displacement, as shown in FIG.

In the manufacture of the anchor bolt set 3 of the present embodiment, the anchor bolt fixing member 1 is screwed onto the anchor bolt 2. In order to prevent the anchor bolt fixing member 1 from coming off or slipping, the above-described It is desirable to make the inner diameter of the coil spring portion 10 of the through anchor bolt fixing member 1 smaller than the diameter of the anchor bolt 2 . However, under such conditions, the screwing of the anchor bolt fixing member 1 to the anchor bolt 2 becomes extremely tight, and the manufacture of the anchor bolt set 3 may become complicated. In the present invention, considering such a case, the anchor bolt fixing member fixture 40 can be used for manufacturing the anchor bolt set 3 .

As shown in FIG. 9A, the anchor bolt fixing member fixture 40 of the present embodiment includes a base portion 42, an insertion hole 43 into which the coil spring portion 10 penetrating the base portion 42 can be inserted, and an insertion hole 43. An insertion member 41 is provided which has a return portion fixing groove 44 into which a pair of return portions 12 provided on the inner wall portion can be fitted.

In attaching the anchor bolt fixing member 1 to the anchor bolt 2 using the anchor bolt fixing member fixture 40 having the insertion member 41 of the present embodiment, as shown in FIG. The coil spring portion 10 is inserted into the insertion hole 43, and the pair of return portions 12 are fitted into the return portion fixing grooves 44 to fix the anchor bolt fixing member 1. As shown in FIG. In this state, the anchor bolt 2 is rotated while the lower end of the anchor bolt 2 is in contact with the upper end of the anchor bolt fixing member 1 . As a result, the anchor bolt fixing member 1 can be easily screwed onto the anchor bolt 2, and the anchor bolt set 3 can be manufactured easily.

Moreover, in order to make it easier to rotate the anchor bolt 2 in the axial direction, the end of the anchor bolt 2 may be provided with a notch 23 as shown in FIG. 7(B). When the anchor bolt set 3 is manufactured, it can be screwed more easily by fitting a slotted screwdriver or the like into the notch 23 provided at the end of the anchor bolt 2 and rotating it.

Further, in order to screw a plurality of anchor bolt fixing members 1 onto the anchor bolt 2 in one process, an anchor bolt fixing member fixture 401 of the embodiment shown in FIG. 10 can be used.

An anchor bolt fixing member fixture 401 of this embodiment basically has a configuration in which three anchor bolt fixing member fixtures 40 shown in FIG. A slit 46 having the same diameter as the anchor bolt 2 is provided so as to connect one side of the outer edge and the insertion hole 43 . The vertical spacing of the base portion 42, that is, the length of the spacer 45 is set to the spacing of the anchor bolt fixing member 1 to be screwed.

According to the anchor bolt fixing member fixture 401 of this embodiment, the uppermost anchor bolt fixing member 1 is inserted into the insertion holes 43 and the return portion fixing grooves 44 of each step. to the lowermost anchor bolt fixing member 1, thereby manufacturing an anchor bolt set 3 in which three anchor bolt fixing members 1 are arranged at predetermined intervals in one process. be able to. Further, by increasing the number of stages in this embodiment, it becomes possible to dispose more anchor bolt fixing members 1 at predetermined intervals.

In order to remove the anchor bolt set 3 after the completion of screwing from the anchor bolt fixing member fixture 401, the anchor bolt set 3 is pulled upward, and the anchor bolt fixing member is removed from the insertion hole 43 and the return portion fixing groove 44. The anchor bolt 2 can be removed by moving the portion of the anchor bolt 2 from the slit 46 in a state where the anchor bolt 1 is removed.

Further, in order to screw the anchor bolt fixing member 1 onto the anchor bolt 2 more easily, an anchor bolt fixing member fixture 60 having an insertion member 41 can be used. As shown in FIG. 11, the insertion member 41 of the present embodiment has a cylindrical base 42, an insertion hole 43 at one end, a return portion fixing groove 44 on the inner wall surface, and a rotating device 64 at the other end. It has a connectable connecting portion 47 .

The insertion hole 43 of the base portion 42 is formed to have a diameter that allows at least the anchor bolt fixing member 1 to be inserted therein, and a return portion fixing groove 44 is formed in the inner wall portion thereof. That is, when the anchor bolt fixing member 1 is set in the insertion hole 43 of the base portion 42 , the return portion 12 is fitted into the return portion fixing groove 44 and the anchor bolt fixing member 1 is loose in the insertion hole 43 . It will be in a state where it does not come together and does not rotate together.

The depth of the insertion hole 43, that is, the longitudinal length of the base 42 of the cylindrical body must be at least the length from the end of the anchor bolt to the position where the anchor bolt fixing member 1 is screwed. .

A connecting portion 47 that can be connected to the rotating device 64 is provided at the other end portion of the base portion 42 opposite to the end portion where the insertion hole 43 is provided. Here, examples of the rotating device 64 include electric rotating tools such as a drill driver, an impact wrench, and an impact driver. Moreover, it is preferable that the rotation device 64 is capable of freely controlling the rotation speed.

The shape of the connection portion 47 is not particularly limited as long as it can be connected to the chucks of the various rotating devices 64 described above. can be

FIG. 12 shows an embodiment of an anchor bolt fixing member fixture 60 having the insert member 41 described above.

The fixing member fixture 60 for anchor bolts of this embodiment comprises two guide shafts 62 erected on a base 61 with an interval therebetween, and an insertion member holder 63 that connects the two guide shafts 62. I have. The insertion member holder 63 is provided so as to move up and down along the guide shaft 62, and a fixing portion 631 is provided in the central portion of the insertion member holder 63 to allow the insertion member 41 to be rotatably connected and fixed. ing. A bearing is provided in the fixed portion 631 and holds the insertion member 41 rotatably. Further, the insertion member holder 63 is provided with a stopper 632 so that it can be temporarily held on the guide shaft 62 .

A rotating device holder for connecting and fixing the rotating device 64 may be used instead of the insertion member holder 63 . In this case, the insertion member 41 is connected to the rotating device 64 while the rotating device 64 is connected and fixed to the rotating device holder.

Further, the base 61 is provided with an anchor bolt fixing portion 611 for fixing the anchor bolt 2 vertically. The configuration of the anchor bolt fixing portion 611 is not particularly limited as long as it can be firmly fixed so that the anchor bolt 2 does not rotate together. After screwing the anchor bolt 2 upright, it can be fixed by tightening the nut screwed onto the anchor bolt 2 in advance to the base 61 .

Further, the guide shaft 62 is provided with an installation position indication member 65 for determining and confirming the screwing position of the anchor bolt fixing member 1 with respect to the anchor bolt 2 . The installation position indicating member 65 can be fixed at any height of the guide shaft 62 . Further, it is preferable to provide a scale on the guide shaft 62 on which the installation position indicating member 65 is provided in order to ensure accurate positioning.

The procedure for using the anchor bolt fixing member fixture 60 of the above embodiment will be described in detail below. First, the anchor bolt 2 is erected on the anchor bolt fixing portion of the base 61 of the anchor bolt fixing member fixture 60 shown in FIG. 12 so as not to rotate together. At this time, the installation position indicating member 65 provided on the guide shaft 62 is fixed in accordance with the fixing position of the anchor bolt fixing member 1 .

Next, as shown in FIG. 11 , the anchor bolt fixing member 1 is inserted into the insertion hole 43 of the insertion member 41 rotatably fixed to the insertion member holder 63 , and the barb portion 12 is inserted into the barb portion fixing groove 44 . It is fitted and set in the insertion hole 43 so that it does not rattle with the anchor bolt fixing member 1 and does not rotate together.

Next, the rotating device 64 is connected to the connection portion 47 of the insertion member 41, and the end portion of the coil spring portion 10 of the anchor bolt fixing member 1 inserted into the base portion 42 is brought into contact with the tip portion of the anchor bolt. , the anchor bolt fixing member 1 is screwed into the anchor bolt 2 while gradually increasing the rotational speed of the rotating device 64 . At this time, the insertion member holder 63 descends as the anchor bolt fixing member 1 is screwed. Then, screwing is stopped with reference to the preset position of the installation position indicating member 65 . Thereby, a desired anchor bolt set 3 can be obtained.

For example, when two anchor bolt fixing members 1 are screwed into the anchor bolt 2, first, the lower anchor bolt fixing member 1 is screwed by the above method, and then The inserting member 41 is pulled up, the anchor bolt fixing member 1 is newly set, and the same operation is performed. This operation is repeated when three or more anchor bolt fixing members 1 are to be screwed together. Thus, the anchor bolt set 3 to which the desired number of anchor bolt fixing members 1 are attached can be obtained.

A post-installation anchor bolt installation method using the anchor bolt set 3 of the present embodiment will be described in detail with reference to the drawings. First, as shown in FIG. 13(A), a hole 51 having a predetermined diameter and depth is formed in the base of the concrete member 5 . The diameter and depth of the hole 51 can be appropriately determined according to the standard of the anchor bolt 2 to be inserted. Normally, when using an anchor bolt 2 with a diameter of 8 mm, the diameter of the hole 51 is about 10 to 12 mm. , depths of the order of 64 to 120 mm are considered.

Next, an adhesive is injected into the perforations 51 . The adhesive to be injected is not particularly limited, but an organic adhesive such as an epoxy, acrylic, or polyester, or an inorganic adhesive such as a cement is usually used. As for the injection amount, the injection amount that fills the space between the hole 51 and the inserted anchor bolt 2 is taken into consideration.

Next, the installation situation of the conventional anchor bolt 2 and the installation situation when using the present invention will be described. 14(A) and (B) show an example of a case where the conventional anchor bolt 2 is installed downward. ), it was fixed using a positioning jig 52 or the like so that it would not tilt, so it took a lot of work. In contrast, according to the anchor bolt set 3 of the present embodiment, the anchor bolt 2 can be easily and reliably installed at the center of the hole 51 as shown in FIG. 13(B).

15(A) and (B) show an example of a conventional anchor bolt 2 installed upward. Conventionally, as shown in FIG. , as shown in FIG. 15(B), fixing with a binding wire or the like in order to prevent slippage was time-consuming. In contrast, by inserting the anchor bolt set 3 according to the present invention into the bore 51, the anchor bolt 2 can be installed so as not to move downward under its own weight.

Next, as shown in FIG. 13B, the anchor bolt set 3 of this embodiment is inserted into the bore 51 before the injected adhesive hardens. When inserting, the anchor bolt fixing member 1 is positioned in the hole 51, the tip of the barb portion 12 is directed toward the opening of the hole 51, and each of the pair of barb portions 12 is inserted. It is inserted so as to contact the inner wall surface of the perforation 51 . As a result, the anchor bolt 2 can be arranged on the center axis of the hole 51, and the anchor bolt 2 can be held in the hole 51 without using an auxiliary tool or the like until the adhesive hardens. .

Hereinafter, the anchor bolt fixing member and the anchor bolt set 3 of the present invention will be specifically described with reference to examples. However, the present invention is not limited to the examples.

Prepare 10 anchor bolts 2 (standard: M8 (outer diameter 8 mm), length: 120 mm, thread pitch: 1.25 mm), and screw the anchor bolt fixing part with the configuration and conditions shown in Table 1 to these. Anchor bolt set 3 of Examples 1 to 10 was produced.

Next, ten holes 51 with an interval of 200 mm, a diameter of 10.5 mm, and a depth of 70 mm were formed in the side surface of the concrete member 5 as the RC base portion shown in FIG. 16, as shown in FIG. In addition, each space|interval is the space|interval which considered the cone breaking effective area 54 (160 mm of diameter) at the time of a test, and was set to 200 mm as the space|interval which does not interfere with each other. Also, the inside of each perforation 51 was cleaned.

Then, about 4 cm ³ of modified vinyl ester resin as an adhesive was injected into the holes 51 into which the anchor bolt sets 3 of Examples 4 to 10 were to be inserted. 10 anchor bolt sets 3 were inserted into the bores 51 and cured. Also, the anchor bolt sets 3 of Examples 1 to 3 were inserted into the perforations 51 not filled with adhesive.

Next, in this state, as shown in FIG. 18, an anchor tensile tester 6 (manufactured by Sanko Techno Co., Ltd.: Technotester) is attached to the wall surface of the concrete member 5 and the anchor bolt set 3 via a jig. The initial stiffness and maximum yield strength were measured, and the fracture properties after the maximum yield strength were observed.
Table 3 shows the results.

From these results, in the post-installed anchor bolt construction method, by using the anchor bolt set 3 of the present invention, the anchor bolt 2 can be arranged in the center of the hole 51, and even if the pull-out external force acts on the anchor bolt 2, , it was confirmed that sufficient yield strength was obtained.

REFERENCE SIGNS LIST 1 anchor bolt fixing member 10 coil spring portion 11 wire rod 12 return portion 2 anchor bolt 20 screw thread 21 flank 3 anchor bolt set 40 anchor bolt fixing member fixture 41 insertion member 42 base portion 43 insertion hole 44 return portion fixing groove 45 spacer 46 Slit 47 Connection Part 5 Concrete Member 51 Drill Hole 60 Fixing Member Attachment for Anchor Bolt 61 Base 611 Anchor Bolt Fixing Part 62 Guide Shaft 63 Insertion Member Holder 631 Fixing Part 632 Stopper 64 Rotating Device 65 Installation Position Indicating Member

Claims (7)

An anchor bolt fixing member for fixing an anchor bolt having threads on its outer surface to a hole formed in a concrete member,
The anchor bolt fixing member includes a coil spring portion that is screwed onto the thread of the anchor bolt;
A pair of return portions provided at both ends of the coil spring portion and bent with an angle in one direction with respect to the coil spring portion ,
The inner diameter of one end of the coil spring portion is smaller than the inner diameter of the other end, and the inner diameter of the other end is the same as the outer diameter of the anchor bolt, and the inner diameter of the one end is equal to the anchor bolt. smaller than the outer diameter of
The pair of return portions are provided so that they face each other when screwed onto the anchor bolt,
The wire diameter of the wire constituting the coil spring portion is such that, when the coil spring portion is screwed onto the thread of the anchor bolt, at least a portion of the wire is in contact with the flanks of the adjacent thread. A fixing member for an anchor bolt, characterized by being set. The anchor bolt fixing member according to claim 1 is attached to an anchor bolt, and in the anchor bolt fixing member, when the anchor bolt is inserted into the drill hole, the pair of barb portions are aligned with the drill hole. An anchor bolt set characterized in that it is installed so as to face the direction of the insertion port. 3. The anchor bolt set according to claim 2, wherein the central axis of said anchor bolt is hollow pipe-shaped. 4. The anchor bolt set according to claim 2, wherein a plurality of said anchor bolt fixing members are attached to said anchor bolt. 5. The projecting width of the return portion is set to be larger than 1/2 of the difference between the outer diameter of the anchor bolt and the diameter of the hole. Anchor bolt set. An anchor bolt fixing member fixture for screwing an anchor bolt into the anchor bolt fixing member according to claim 1,
An insertion member having a base, an insertion hole into which a coil spring penetrating through the base can be inserted, and a return portion fixing groove into which a pair of return portions provided on the inner wall of the insertion hole can be fitted,
In a state in which the coil spring portion is inserted into the insertion hole and the pair of return portions are fitted into the return portion fixing groove to fix the anchor bolt fixing member, the A fixing member fixture for an anchor bolt, characterized in that the anchor bolt can be screwed. The base portion is a cylindrical body, and an insertion member having the insertion hole at one end and the return portion fixing groove on the inner wall portion and a connection portion connectable to a rotating device at the other end,
The coil spring portion is inserted into the insertion hole, the pair of return portions are fitted into the return portion fixing groove to fix the anchor bolt fixing member, the connection portion is connected to the rotating device, and the 7. The anchor bolt fixing member according to claim 6, wherein the anchor bolt fixing member can be screwed into the anchor bolt by rotating the base while contacting the end of the anchor bolt. Fixed member fixture.

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