JP2007314944A - Anchor bolt and tool for installing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an anchor bolt capable of securing the length of a female screw for threading a screw shaft joined to the anchor bolt even if the buried length is small and suitable for a PC concrete board and an installation tool for installing the anchor bolt. <P>SOLUTION: This anchor bolt 1 comprises an anchor body 10 at the end of which an enlarged part 12 with a slit 11 is formed, on the base end inner peripheral surface of which the female screw 13 is formed, and in the tubular body of which an enlarged cone 14 is inserted and a conical washer 20 formed in a bevel shape in cross section. In the conical washer 20, a through hole 21 in which the anchor body 10 is allowed to fit is formed at the center. The anchor body 10 is inserted from the through hole 21 of the conical washer 20 toward the inside of the bevel shape. The enlarged part 12 of the anchor body 10 projects from the washer skirt part of the conical washer 20. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an anchor bolt used in a concrete structure and its construction jig, and more particularly to an internal cone driving type anchor having an expansion cone built in an anchor body and its construction jig.

  The internal cone driving type anchor is inserted into a construction hole opened in the concrete structure, and the extension cone built in the anchor body is struck using a construction jig, and the tip of the anchor body is expanded and fixed to the concrete structure. It is a metal expansion anchor.

The internal cone driving type anchor is provided with a female screw on the inner peripheral surface of the proximal end portion of the anchor main body and an expanded portion at the distal end portion. Here, the length of the female screw formed on the anchor body is required to be at least equal to the female screw diameter in order to ensure the screw strength. This is because when the anchor body material is generally used as a cold forging material and the tensile strength is 400 N / mm ² , the strength category of the mechanical properties of the screw corresponds to about 4.6. Therefore, when the escape of the screw formed at the female screw inlet portion of the anchor body is included, the length of the female screw needs to be at least equal to the female screw diameter as described above.

  In addition, the expansion portion of the anchor body cannot secure a desired tensile force unless the expansion angle is formed gently. If the expansion angle of the expanded portion is a steep angle, in ordinary concrete, the construction driving force to be expanded may become very large, which may result in insufficient driving. For this reason, in the case of the female thread M10 of the anchor body that is most frequently used, the expanded portion requires a length of at least about 15 to 20 mm.

  As described above, the length of the female screw formed on the anchor bolt needs to be at least equal to the diameter of the female screw. However, the desirable female screw length in the female screw M10 is the clearance of the screw at the inlet portion and If the length of the incomplete screw part formed in the back part is considered, 15-18 mm will be needed. On the other hand, the length of the expanded portion is preferably 15 to 20 mm at least when considering the relationship with the expanded angle. In addition, it is desirable that the incomplete thread portion of the female screw and the end portion of the slit formed in the widened portion are separated from each other in consideration of the strength of the anchor body itself, so the necessary length of the anchor bolt body is 40 mm. The above is desirable.

  At present, most anchor bolts having a total length of 40 mm are produced and used. However, when an anchor having a length of 40 mm is to be installed on a relatively thin ceiling plate, the drill tip may hit the reinforcing bar during drilling. Therefore, even if the tensile strength of the anchor is somewhat lowered by overlapping the slit end portion of the expanding portion and the incomplete portion of the female screw, the one having a total length of 30 mm is used for the ceiling anchor.

  However, since the above-mentioned 30 mm long anchor has a limited drilling depth of the construction hole, a flange is formed at the base end portion of the anchor body, and the driving reaction force is originally received by the expanded portion at the tip of the anchor. Is intentionally received at the proximal end of the anchor body. For this reason, the construction hole of the anchor is formed to a depth of about 32 to 33 mm, which is slightly longer than the anchor length, and the anchor is constructed in a state of floating in the construction hole.

  By the way, in the construction of a concrete building, a construction method is known in which a PC concrete plate is laid as a floor structure, the lower surface of the laid PC concrete plate is a ceiling, and concrete is placed on the upper surface to form a floor surface. The PC concrete board for constructing the floor structure is a popular type that is generally used and has a thickness of 150 to 200 mm. In addition, an anchor bolt may be constructed after the laid PC concrete board is constructed.

  Since PC concrete boards are often used with a hollow structure in order to reduce the weight, even if the anchor body has a total length of 30 mm, the PC board has the high compressive force of the concrete. In a place that coincides with the hollow part, there are cases in which holes are lost in the hollow part during drilling, which is difficult in construction. In order to solve this problem, an anchor bolt having a total length of about 20 mm and capable of being constructed even in a hollow portion of a PC plate has been developed and provided.

Many PC concrete boards have a compressive force of 40 N / mm ² or more, and the compressive force is higher than that of ordinary concrete, which is about 24 N / mm ^{2. In} the case of PC boards, anchors embedded in concrete Even if the length of the main body is short, it can be said that there is little possibility that the constructed anchor will fall off. However, in the case of an anchor having a length of 20 mm, even if the constructed anchor itself has a sufficient pulling force, if the female thread of the anchor body is M10, the length of the female thread is limited to 7 to 8 mm. Therefore, the fitting length with the male screw may not be sufficient, and the coupling force of the screw shaft attached to the female screw cannot be increased. Therefore, as a result, there is a problem that a short anchor cannot obtain a predetermined supporting force on the screw shaft.

  Further, the driving type anchor is constructed by hitting a cone or an anchor main body accommodated in the anchor main body, and various construction jigs have been conventionally proposed. As a conventional example of a construction jig, a construction jig (Patent Documents 1 and 2) used for an internal cone driving type anchor in which a cone is built in an anchor body, a sleeve on an outer diameter portion of an anchor shaft formed integrally with a mounting screw Construction jigs used for sleeve driven anchors (Patent Document 3), construction jigs used for body driven anchors with cones fitted at the tip of the anchor body (Patent Documents 4 and 5), etc. It has been.

Japanese Patent Laid-Open No. 11-10454 JP-A-2-199309 Japanese Patent Laid-Open No. 3-155907 Japanese Utility Model Publication No. 5-77453 Japanese Utility Model Publication No. 3-102606

  The construction jigs described in the above-mentioned patent documents are all proposed as construction jigs suitable for driving-in anchors, but at the start of construction, the anchors temporarily fixed to the construction jigs fluctuate so that it is easy to use. I could not say it.

  The problem to be solved by the present invention is an internal cone driving type anchor in which the effective length of the female screw formed in the anchor body is secured even if the embedding depth embedded in the concrete is shallow, It is another object to provide a suitable anchor bolt and to provide a construction jig for constructing the anchor bolt.

  The first of the means for solving the problem is to form an expanded portion having a slit at the distal end portion, form an internal thread on the inner peripheral surface of the proximal end portion, and insert an expansion cone into the cylindrical body; And a washer top portion of the conical washer fixed to the proximal end portion of the anchor body.

  According to a second aspect of the present invention, in the first means, a through-hole having a size capable of fitting an anchor main body is provided at a central portion of the conical washer, and the anchor main body extends from the through-hole of the conical washer toward the inside of the umbrella shape. And an expanded portion of the anchor main body is projected from the washer skirt of the conical washer.

  According to a third aspect of the present invention, in the first means, a through-hole having a size capable of fitting an anchor main body is provided in a central portion of the conical washer, and the anchor main body extends from the through-hole of the conical washer toward the outside of the umbrella shape. And an expanded portion of the anchor main body is projected from the top of the washer of the conical washer.

  A fourth solution is a construction jig for constructing an anchor bolt with a conical washer, the construction jig comprising a driving rod and a coil spring to be mounted on the driving rod, and the driving rod has a driving rod base end. A tip of a driving rod having an axial diameter that can be inserted into the cylinder of the anchor body is formed at the tip of the portion, and the coil spring is provided on a small diameter spring portion and an anchor bolt that are slidably formed on the driving rod. A spring large-diameter portion having a diameter to which the conical washer can be loosely fitted, and the coil spring is formed such that the length of the spring large-diameter portion is the same as or slightly longer than the height of the conical washer, The base end portion of the small spring diameter portion is locked to the base end portion of the driving rod.

  The fifth of the means for solving is a construction jig for constructing an anchor bolt, the construction jig comprising a driving rod and a coil spring mounted on the driving rod, and the driving rod is a tip of the driving rod base end portion. The tip of the driving rod having an axial diameter that can be inserted into the cylinder of the anchor body is formed, and the coil spring is slidably mounted on the driving rod by forming the entire area with the same diameter, and the base end of the coil spring The portion is locked to the base end portion of the driving rod.

  Since the anchor is provided with a cone washer having an umbrella-shaped cross section at the base end of the anchor body, the anchor body is constructed so that the cone washer portion protrudes from the concrete surface. This means that the female screw is formed to be substantially long by a height corresponding to the height. Therefore, the female screw has a sufficient length to screw the screw shaft, and is a portion embedded in the concrete. Has an effect that an anchor having a high support strength can be obtained even if it is short.

  Since the expansion part of an anchor main body protrudes from the washer skirt part of a cone washer, the length by which an anchor main body is embed | buried in concrete reduced the height of the cone washer from the main body full length. Even when the concrete is a PC concrete plate and has a cavity inside, there is an effect that it is not necessary to avoid the cavity and the construction can be performed reliably.

  Further, according to the second aspect of the present invention, when the anchor is installed, the washer hem of the conical washer that is in contact with the concrete surface is subjected to a reaction force by the impact at the time of driving, and is slightly due to the instantaneous spring action when the conical washer is hit. Open again and immediately return to the original state. When the conical washer returns after opening, a tensile force is applied to the anchor body due to the restoring force of the conical washer.Therefore, unlike the case where the conical washer is not used, no initial displacement occurs and the anchor body is displaced with respect to the initial tensile load. A proportional load / displacement curve is obtained. This is because when a conical washer is used, a tensile load is applied to the anchor body by striking at the time of driving, so there is no initial displacement. Therefore, when the screw shaft is coupled to the anchor body, it is not necessary to apply torque for removing the initial displacement, and there is an effect that quick construction can be performed.

  Since the conical washer provided in the anchor main body is formed in a trumpet shape at the base end of the main body, when the screw shaft is coupled to the female screw after the anchor construction, the washer skirt of the conical washer is made of concrete. It is open on the surface, so that it becomes a guide for inserting the tip end of the screw shaft into the cylindrical portion of the anchor body, and the construction is easy.

  According to a fourth aspect of the present invention, the construction jig is provided with a coil spring having a large-diameter spring portion having a diameter capable of loosely fitting a conical washer while providing a driving rod tip portion that can be inserted into the cylinder of the anchor body on the driving rod. Therefore, when starting construction work, the anchor body protrudes from the construction jig, but the tip of the driving rod is inserted into the cylinder of the anchor body, and the conical washer is loosely fitted to the spring large diameter part. Since the anchor body does not fluctuate in the construction jig, there is an effect that the construction can be easily and reliably performed.

  The fifth aspect of the present invention has the effect that the coil spring is suitable for construction of a normal straight anchor bolt since the entire region is formed to have the same diameter.

  FIG. 1 shows a first embodiment of an anchor bolt, in which A is a partially broken front view, B is a side view, C is a component diagram, and FIG. 2 shows an anchor bolt construction state according to the first embodiment. FIG. 3 is a sectional view, FIG. 3 shows a second embodiment of the anchor bolt, A is a partially cut front view, B is a side view, and C is a component diagram. FIG. 4 shows a construction jig for constructing the anchor bolt of the first embodiment, wherein A is a front view and B is a component diagram. FIG. 5 is a front view showing the start of anchor bolt construction according to the first embodiment, FIG. 6 is a front view showing the anchor bolt construction work according to the first embodiment, and FIG. 7 is the start of anchor bolt construction according to the second embodiment. FIG. 8 is a front view showing the construction work of the anchor bolt according to the second embodiment. FIG. 9 is an overall front view showing a construction jig for constructing other anchor bolts other than the first and second embodiments.

  In the present specification, the “base end portion” of the anchor bolt or the anchor body means an end portion on the side where the anchor is struck at the time of anchor construction, and the “tip portion” is the side on which the expanded portion is formed. The end of

First Embodiment of Anchor Bolt In FIG. 1, an anchor bolt 1 according to a first embodiment includes an anchor body 10 formed in a cylindrical shape, and a first conical washer 20 provided at a proximal end portion of the anchor body 10. It consists of

  The anchor bolt 1 is an internal cone driving type metal expansion anchor, and the anchor main body 10 forms an expanded portion 12 provided with four slits 11 along the axis from the distal end portion, and the inner periphery of the proximal end portion. A female screw 13 is formed on the surface. Reference numeral 14 denotes an expansion cone inserted into the anchor main body 10 and is formed in a tapered shape having a small diameter from the central portion toward the tip. Note that the inner peripheral surface of the expanded portion 12 of the anchor body 10 is formed in a tapered shape having a small diameter at the tip corresponding to the tapered shape of the expanded cone 14.

  In the embodiment, knurls are formed on the outer peripheral surface of the expanded portion 12, but knurl processing is optional.

  The anchor bolt 1 has a packing 15 attached to the proximal end portion of the expansion cone 14 in order to prevent the expansion cone 14 inserted into the cylinder of the anchor body 10 from dropping off. The packing 15 is a slightly thick paper or plastic plate, and is formed to have a diameter slightly larger than the female screw diameter of the anchor body 10 and press-fitted into the valley portion of the female screw. Further, a flange 16 having a large diameter toward the base end is formed at the base end of the anchor body 10, and the first conical washer 20 is not easily removed from the flange 16. Are combined.

  The first conical washer 20 is formed in an umbrella shape in cross section, and is provided with a first through-hole 21 formed in a size that allows the anchor main body 10 to be fitted at the center, from the first through-hole 21. The anchor main body 10 is inserted into the shape of an umbrella, and the widened portion 12 of the anchor main body 10 is protruded from the washer skirt and fixed to the proximal end portion of the anchor main body 10.

  In FIG. 2, reference numeral 50 denotes a PC concrete plate in which a PC steel wire 51 is disposed and a cavity 52 is formed. Since the PC board 50 is for constructing a ceiling of a concrete building, the lower surface is a ceiling surface in the drawing, and the concrete 53 is placed on the upper surface to be a floor surface. Reference numeral 54 denotes a reinforcing bar embedded in the concrete 53.

  The anchor bolt 1 inserts the anchor main body 10 into a construction hole formed in the PC concrete plate 50, and widens the expanding portion 12 at the back of the construction hole. In the construction, the depth of the construction hole opened in the PC board 50 is slightly longer than the length obtained by subtracting the height of the first conical washer 20 from the total length of the anchor body 10. That is, the anchor body 10 is constructed so that the distal end portion does not contact the bottom of the construction hole. In the construction work, the anchor main body 10 is inserted into the construction hole, and the expansion cone 12 inserted into the main body is struck using a driving rod (not shown) to expand the expanded portion 12.

  In the embodiment, since the anchor body 10 is embedded in the PC plate 50 by a length obtained by subtracting the height of the first conical washer 20 from the entire length of the anchor body 10, the embedded length is shortened. At this time, even if the cavity 52 is present on the PC board 50, the construction can be performed without avoiding the cavity. However, since the total length of the anchor main body 10 is formed to protrude from the PC plate 50, the female screw 12 provided inside the main body can secure a sufficient length necessary for coupling the screw shafts. is there.

Second Embodiment of Anchor Bolt In FIG. 3, the anchor bolt 2 according to the second embodiment is different from the first embodiment in the mounting direction of the second conical washer 30 provided at the proximal end portion of the anchor body 10. However, since the structure of the anchor main body and the expansion cone are the same as those in the first embodiment, the same parts are denoted by the same reference numerals and description thereof is omitted.

  The second conical washer 30 is formed in an umbrella shape in cross section, and is formed with an anchor holding cylinder 32 in which a second through hole 31 of a size that can fit the anchor body 10 is secured in the center. Thus, the expanded portion 12 of the anchor body 10 is protruded from the top of the washer of the second conical washer 30, specifically from the anchor holding cylinder 32, and fixed to the proximal end portion of the anchor body 10.

  Also in the second embodiment, the anchor body 10 is constructed so as to protrude from the PC concrete plate 50 by the height of the second conical washer 30. Therefore, here too, as in the first embodiment, the female screw 12 can ensure the length necessary for coupling the screw shafts. The height of the second conical washer 30 is formed higher than the height of the first conical washer 20, but the anchor embedding depth is the same as in the first embodiment.

  In the second embodiment, the second conical washer 30 has a trumpet shape and is exposed to the opening of the anchor body 10 when it is applied to the PC plate. At the time of coupling, the second conical washer 30 guides the tip end of the screw shaft to the cylindrical portion of the anchor main body 10 and facilitates the mounting operation of the screw shaft.

First Example of Construction Jig In FIG. 4, a first construction jig 100 is composed of a driving rod 110 and a first coil spring 120 provided on the driving rod 110. The driving rod 110 has a driving rod base end portion 111, a spring holding cylinder portion 112, and a driving rod distal end portion 113, and is connected to the driving rod base end portion 111 to connect another connecting driving rod (not shown). The connecting female screw 114 is formed. The driving rod tip 113 is formed to have a shaft diameter that can be inserted into the cylinder of the anchor body 10. The spring holding cylinder 112 is formed to have a smaller diameter than the driving rod base end portion 111 and a larger diameter than the driving rod tip end portion 113, and between the spring holding cylinder 112 and the driving rod base end portion 111. An annular groove 115 that engages with the first coil spring 120 is formed.

  The first coil spring 120 has a spring holding cylindrical portion 112, a slidable and expandable spring small-diameter portion 121, and a spring large-diameter portion 122 having a diameter capable of loosely fitting the first and second conical washers 20 and 30. The length of the spring small diameter portion 121 is substantially the same as that of the spring holding cylinder portion 112, and the length of the spring large diameter portion 122 is the same as or slightly longer than the height of the conical washers 20 and 30. The base end portion of the small spring diameter portion 121 of the first coil spring 120 is formed in an engagement ring 123 having a diameter slightly smaller than that of the small spring diameter portion 121, and the engagement ring 123 is driven into the rod. The first coil spring 120 is engaged with an annular groove 115 formed in the base end portion 111 so that the first coil spring 120 does not easily come out of the driving rod 110.

  In order to assemble the first construction jig 100, the driving rod tip portion 113 of the driving rod 110 is inserted into the small spring diameter portion 121 of the first coil spring 120, and the engagement ring 123 of the small spring diameter portion 121 is inserted into the spring holding cylinder. Engage with the annular groove 115 of the portion 112. The first coil spring 120 is engaged with the base end portion of the spring holding cylinder portion 112 and is attached so as not to escape, and the spring small diameter portion 121 is slidably and telescopically mounted around the spring holding cylinder portion 112. Is done. When the first coil spring 120 is mounted on the driving rod 110, the tip of the driving rod tip 113 does not protrude from the free end of the spring large-diameter portion 122. Since the free end of the large diameter portion 122 reaches the spring holding cylinder 112, the driving rod tip portion 113 protrudes from the compressed first coil spring 120 (see FIG. 6A).

Anchor bolt construction work FIGS. 5 and 6 show anchor bolt construction work according to the first embodiment. In FIG. 5, at the start of the construction work, the construction jig inserts the driving rod distal end portion 113 of the driving rod 110 into the proximal end portion of the anchor main body 10, and the first large spring portion 122 of the first coil spring 120 has the first portion. The conical washer 20 is loosely fitted to cause the expanded portion 12 of the anchor body 10 to protrude from the spring large diameter portion 122.

  At this time, the tip end portion 113 of the driving rod 110 reaches the vicinity of the expansion cone 14 in the cylindrical body of the anchor body 10. However, since the construction work is to strike the driving rod 110 to press-fit the expansion cone 14 into the expanding portion 12, even if the tip of the driving rod tip 113 comes into contact with the expansion cone 14 at the start of the construction work. Even in such a case, it is necessary to ensure a distance equal to the length for moving the expansion cone 14 between the first conical washer 20 of the anchor bolt 1 and the tip of the spring holding cylinder portion 112. .

  For example, when constructing the anchor bolt 1 on the ceiling portion of the concrete 60, as shown in FIG. 5, the expanded portion 12 of the anchor body 10 is set facing upward. In addition, a connection driving rod (not shown) is connected to the connection female screw 114 provided at the base end portion of the driving rod 110 to form a substantially long driving rod. In the figure, 61 is an anchor bolt construction hole opened in the concrete 60, which is slightly longer than the total length of the anchor bolt to be embedded.

  In FIG. 6, the expanded portion 12 of the anchor bolt 1 mounted on the driving rod 110 is inserted into the construction hole 61 of the concrete 60, and the driving rod 110 is hit using a driving tool. As a result, the driving rod 110 compresses the first coil spring 120 and the leading rod portion 113 enters the distal end portion, that is, the distal end portion 113 of the anchor body 10 toward the back, and the expansion cone 14 enters the expanding portion 12. It press-fits, the said expansion part 12 is expanded, and the anchor bolt 1 is fixed to the concrete 60 (refer FIG. 6A).

  In the embodiment, the packing 15 is provided so that the expansion cone 14 does not fall off from the anchor main body 10. However, since the packing 15 is a paper or a plastic plate, it can be ignored during construction work. .

  When the anchor bolt 1 is applied, the first coil spring 120 is compressed when the driving rod 110 is struck, so that the driving rod 110 can be easily extracted from the anchor bolt 1 after the completion of the operation (see FIG. 6B). .

  7 and 8 show an anchor bolt construction work according to the second embodiment. The anchor bolt 2 according to the second embodiment is different from the first cone washer 20 in the mounting direction of the second conical washer 30, but the construction work is performed in the same procedure as in the first embodiment.

  Since the first coil spring 120 is compressed when the driving rod 110 is struck during construction of the anchor bolt 2 according to the second embodiment, the spring large diameter portion 122 is naturally compressed, but the spring large diameter portion 122 and the second cone are compressed. Since the washer 30 is loosely fitted (see FIG. 8A), the driving rod 110 and the second conical washer 30 can be easily detached after the completion of construction.

Specific examples of the first and second anchor bolts The first and second anchor bolts (1, 2) have an anchor main body (10) having a total length of 30 mm, a slit length of 14 mm, a female screw diameter of 10 mm, and an effective length of the female screw. The first and second conical washers (20, 30) have a material spcc, a height of 10 mm, a maximum diameter of 31 mm, and a thickness of 3.2 mm. When the anchor bolt is installed on the PC concrete plate (50), the conical washer is exposed on the surface of the PC plate, so the anchor body (total length 30mm) is the 20mm portion minus the height of the conical washer (10mm). Embedded in the board.

Specific Example of First Construction Jig The first coil spring (120) used for the first construction jig (100) has a spring wire diameter of 1.2 mm and an inner diameter of the spring large diameter portion (122) of 35 mm, The height is 10 mm.

Second Example of Construction Jig In FIG. 9, the second construction jig 200 constructs a normal anchor bolt, and the shape of the second coil spring 220 provided on the driving rod 110 is the first. It is only different from the construction jig 100, and the other constituent members and the assembly method are the same as those of the first construction jig 100. The second coil spring 220 includes a coil portion 221 having the same diameter in the entire region, a pressing ring 222 having a diameter slightly larger than the coil diameter at the distal end portion of the coil portion 221, and a base end portion. And an engagement ring 223 having a slightly smaller diameter.

  Since the second construction jig 200 has a pressing ring 222 at the free end of the second coil spring 220, the spring is prevented from entering the construction hole during anchor construction. It is easy. The anchor bolt 3 can be constructed either of a normal straight type or a flange (not shown).

1 shows a first embodiment of an anchor bolt, in which A is a partially cutaway front view, B is a side view, and C is a component drawing. Sectional drawing which shows the construction state of the anchor bolt by 1st Example. The 2nd Example of an anchor bolt is shown, A is the front view which fractured | ruptured one part, B is a side view, C is component drawing. The construction jig for constructing the anchor bolt of the 1st and 2nd example is shown, A is a front view and B is a parts figure. The front view which shows the time of construction start of the anchor bolt by 1st Example. The front view which shows the operation | work procedure which constructs the anchor bolt by 1st Example. The front view which shows the time of construction start of the anchor bolt by 2nd Example. The front view which shows the operation | work procedure which constructs the anchor bolt by 2nd Example. The whole front view which shows the construction jig for constructing other anchor bolts other than the 1st and 2nd Example.

Explanation of symbols

1, 2, 3 Anchor bolt 10 Anchor body 11 Slit 12 Expanded portion 13 Female screw 14 Expansion cone 15 Packing 16 Flange 20 First conical washer 21 First through hole 30 Second conical washer 31 Second through hole 32 Anchor holding cylinder 50 PC concrete plate 51 PC steel wire 52 Cavity 53 Concrete 54 Reinforcement 100 First construction jig 110 Driving rod 111 Driving rod base end 112 Spring holding cylinder portion 113 Driving rod tip 114 Female thread for connection 115 Annular groove 120 First coil spring 121 Spring small-diameter portion 122 Spring large-diameter portion 123 Engagement ring 200 Second construction jig 220 Second coil spring 221 Coil portion 222 Press ring 223 Engagement ring

Claims (5)

  An expanded portion having a slit at the distal end portion, an internal thread formed on the inner peripheral surface of the proximal end portion, and an anchor body (10) having an expanded cone inserted into the cylindrical body, and a cross-sectional umbrella shape An anchor bolt having a conical washer (20, 30), wherein a top of the washer of the conical washer is fixed to a proximal end portion of the anchor body.   The conical washer (20) is provided with a through-hole having a size capable of fitting the anchor main body (10) at the center, and the anchor main body is inserted from the through-hole of the conical washer toward the inside of the umbrella shape. The anchor bolt according to claim 1, wherein an expanded portion of the main body is protruded from a washer skirt portion of the conical washer.   The conical washer (30) is provided with a through hole having a size capable of fitting the anchor body (10) at the center, and the anchor body is inserted from the through hole of the conical washer toward the outside of the umbrella shape. The anchor bolt according to claim 1, wherein an expanded portion of the main body protrudes from a top of the washer of the conical washer.   A construction jig for constructing an anchor bolt with a conical washer, the construction jig comprising a driving rod (110) and a coil spring (120) to be mounted on the driving rod. A driving rod tip (113) having an axial diameter that can be inserted into the cylinder of the anchor body (10) is formed at the tip of (111), and the coil spring is formed to be slidable on the driving rod. A spring small diameter portion (121) and a spring large diameter portion (122) having a diameter into which a conical washer (20, 30) provided on the anchor bolt (1, 2) can be loosely fitted are formed. An anchor characterized in that the length of the large-diameter spring portion is formed to be the same as or slightly longer than the height of the conical washer, and the base end portion of the small-diameter spring portion is locked to the base end portion of the driving rod. bolt Construction jig. A construction jig for constructing an anchor bolt, the construction jig comprising a driving rod (110) and a coil spring (220) attached to the driving rod, the driving rod being a driving rod base end (111) A driving rod tip (113) having an axial diameter that can be inserted into the cylindrical body of the anchor body (10) is formed at the tip of the coil body, and the coil spring is formed to have the same diameter in the entire area so as to be slidable on the driving rod. An anchor bolt construction jig which is mounted and has a base end portion of the coil spring locked to a base end portion of the driving rod.

Images