JP3947125B2 - Body driven anchor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a “post-installed anchor” for attaching various equipment and the like to a concrete frame of a building, and more particularly to a main body driving type anchor belonging to a metal expansion anchor.
[0002]
[Prior art]
As shown in FIG. 9, the main body driven anchor is composed of an anchor main body 100 and a cone 200. The anchor main body is provided with an axial slit in a hollow portion at one end and a female screw at the other end. It is. In some applications, the anchor body may be a reinforcing bar or a round bar. The cone has a tapered shape, and a small-diameter portion is set in the hollow portion of the anchor body, and the large-diameter portion is protruded from the tip of the hollow portion.
[0003]
In the construction, the cone 200 is set and inserted into the anchor main body 100 in the bottomed hole drilled in the concrete, and the head of the anchor main body protruding on the surface of the concrete surface in a state where the cone hits the bottom of the hole, Strike using a special hammer jig. At the time of driving-in construction, the tip that becomes the expanded portion of the anchor body is expanded while cutting the concrete wall surface along the tapered surface of the cone. At this time, the shavings or particles from which the hole wall has been cut are pushed by the impact force against the tip of the expanded portion of the anchor body, and a space and a part of the tip of the anchor body enter between the slits. In this case, if there is no space for the scraped dust or particles to enter, the tip of the expanded portion of the anchor body compresses the dust or particles at the hole wall surface, and the required anchor expansion cannot be obtained. For this reason, there is a problem that not only the tensile force against the concrete, which is the performance of the anchor, is reduced, but also an unstable tensile force with variations.
[0004]
The prior art of the main body driving type anchor is disclosed in Japanese Utility Model Publication No. 63-32971 (first prior example), Japanese Patent Laid-Open No. 3-233043 (second prior example), Japanese Patent Laid-Open No. 2000-265570 (third prior example). The invention described in is known.
[0005]
The anchor in the first preceding example is not particularly different from the conventional one, and is that a contraction tip having a small diameter is provided at the bottom of the wedge member, and a plurality of anchor main bodies 14 are provided in the hollow portion that opens toward the tip. The wedge member 15 has a widened base end portion 17 and a maximum diameter portion 18 that are tapered, and contracts from the maximum diameter portion toward the tip. A tip 19 is provided. In the anchor of the first preceding example, when the anchor is inserted into the concrete hole and driven into the head of the anchor main body, the divided portion of the main body exceeds the maximum diameter portion of the wedge member and reaches the contraction tip portion. Since the contact support area with the hole wall surface is increased by being bent into an L shape, the tensile force of the anchor against the concrete surface is increased, and a large tensile load is obtained. However, the anchor described in the first prior example has the following problems. The << 1 >> specification does not describe the relationship between the tip outer diameter of the split portion of the anchor body and the maximum diameter of the wedge member, but both are substantially the same diameter with reference to the drawings. Generally, the gap between the drilled concrete hole diameter and the anchor body and wedge member is 0.25 to 0.5 mm on one side. That is, when the anchor body outer diameter is 10 mm, drill using a 10.5 mm concrete drill, and when the anchor body outer diameter is 25.5 mm, drill using a 26.5 mm concrete drill. Because. Therefore, when the tip of the split part of the anchor body cuts the concrete hole wall along the tapered surface of the wedge member by driving, the gap between the main body and the wedge member is immediately filled with the shaved dust or particles, and at the same time, the main body Since the chips or particles are clogged at the tips of the divided portions, the driving resistance is increased and the biting into the concrete hole wall is deteriorated. << 2 >> In the driving operation, the fact that the split part of the anchor main body exceeds the maximum diameter part of the wedge member means that the main body can still be expanded, and only a low tensile force can be obtained due to insufficient expansion. There is a big problem. In addition, when the tensile test of the anchor is performed in this state, when the split part of the main body exceeds the maximum diameter part of the wedge member, a slight gap occurs between the concrete wall and the initial displacement in the load / displacement curve. There is a problem that is said to appear greatly. << 3 >> Moreover, since the entire surface of the inner diameter portion of the anchor main body is in contact with the tapered surface of the wedge member during the driving operation, there is a problem in the operation that the contact surface between the both becomes large and driving resistance increases.
[0006]
The anchor described in the second preceding example is composed of an anchor body 12 and a wedge member 13. Normally, the wedge member is driven at the bottom of the concrete hole and receives a reaction force. The point that the provided stopper 22 receives the driving reaction force of the anchor body at the concrete hole entrance portion is greatly different. By receiving this driving reaction force at the concrete hole entrance part, there is an advantage that the drilling depth in the concrete does not have to be a predetermined depth, but the wedge member that expands the stopper and the anchor body is integrally molded As a result, the following problems have arisen. << 1 >> When the stopper hits the inner edge of the split groove 16 of the anchor body, the wedge piece 21 of the wedge member may not necessarily sufficiently expand the open leg piece 17 of the anchor body. . <2> When the concrete compressive strength is high, the expansion of the wedge member is completed before the stopper hits the inner edge of the split groove, and it is difficult to confirm the completion of driving. <3> When a stopper hits the aggregate in the concrete at the entrance of the concrete hole, the stopper may protrude from the concrete surface and hit the bottom surface of the equipment, and the equipment may not be installed parallel to the concrete surface.
[0007]
The anchor described in the third preceding example is characterized by the cone portion of the anchor body and the cone. The cone 10 is provided with a wedge-shaped rib 13 which is press-fitted into the truncated cone portion 12 and the slit 4 of the anchor body 1 on the stopper wall. When the anchor main body is driven through a jig in the concrete hole, the expanded portion of the main body is expanded at the truncated cone portion of the cone, and the wedge-shaped rib is press-fitted into the slit of the anchor main body. Since the cone cone portion and the wedge-shaped rib have the same inclination angle, the expanded portion of the expanded anchor main body has an integrated shape, and the deformation of the expanded portion is less likely to occur over time. However, the anchor described in the third prior example has the following problems. <1> The fact that the stopper wall is provided on the cone restricts the expansion of the anchor body, and depending on the concrete on which the anchor is constructed, the anchor body may not be sufficiently expanded. Become. << 2 >> When the anchor is driven in, the anchor tip of the anchor body causes the dust or particles that have scraped the concrete hole wall for expansion to accumulate on the stopper wall of the cone. As a result, the swarf or particles accumulated therein could not be sufficiently expanded, and the tensile force of the anchor to the concrete was lowered and became unstable.
[0008]
[Problems to be solved by the invention]
The present invention solves the problems of the prior art, and assures a path through which cutting powder or particles generated during driving work passes, forms a space for storing the cutting powder or particles, and has a driving resistance. It is an object of the present invention to provide a main body driving type anchor that is small and easy to construct and can increase the anchor tensile force against concrete.
[0009]
[Means for Solving the Problems]
The first of the means for solving the problem is that the anchor has a solid shaft or an anchor main body provided with a cross slit parallel to the axial direction from the distal end of the reinforcing bar, and a tapered outer peripheral portion having a proximal end small diameter portion and a distal end large diameter portion. A cone member having a number of discharge grooves corresponding to the number of the cross slits in the axial direction, and forming an expanded portion divided by the cross slits in the anchor body, and the discharge grooves of the cone member Is formed continuously from the base end small diameter portion to the distal end large diameter portion, and is formed in the distal end large diameter portion more than the groove bottom portion of the discharge groove. A small-diameter pedestal portion is provided, the discharge groove has a cross-sectional angle larger than the cross-sectional angle of the widened portion, and the base end small-diameter portion of the cone member is the opening of the cross slit of the anchor body. It is characterized by being fitted to That.
[0010]
According to a first aspect of the present invention, the discharge groove formed in the cone member has an arcuate shape in which the bottom of the discharge groove is recessed in the axial direction, and is continuously formed from the proximal end small diameter portion to the distal end large diameter portion. Since the surface angle is formed to be larger than the cross-sectional angle of the expanded portion, only the fan-shaped end portion where the expanded portion of the anchor body expands in a fan shape and the groove bottom of the discharge groove of the cone member at the time of construction. Therefore, since the area where the inner diameter of the anchor body and the tapered surface of the cone member hit the entire surface is smaller, the driving resistance during construction is reduced, and the construction reliability and the impact force of construction may be small. It becomes. Moreover, since the path | route in which the concrete smash or particle | grains produced at the time of driving construction moves is secured, and the space which collects smashed swarf or particle is formed, swarf or particle moves without being compressed. As a result, the expanded dimension of the anchor can be increased.
[0011]
The second of the means for solving the problem is that the anchor has a solid shaft or an anchor body provided with a cross slit parallel to the axial direction from the distal end portion of the reinforcing bar, and a tapered outer peripheral portion having a proximal end small diameter portion and a distal end large diameter portion. A cone member having a number of discharge grooves corresponding to the number of the cross slits in the axial direction, and forming an expanded portion divided by the cross slits in the anchor body, and the discharge grooves of the cone member Is formed until the bottom of the groove reaches from the proximal end small diameter portion to the vicinity of the distal end large diameter portion, and the distal end large diameter portion is formed to have a smaller diameter than the outer diameter of the anchor main body, and the discharge to the distal end large diameter portion A pedestal portion having a diameter smaller than the groove bottom portion of the groove is provided, and the cross-sectional angle of the discharge groove is larger than the cross-sectional angle of the expanded portion and is formed with two sets of angles with different opening angles. The base end small diameter part of the cone member is It is characterized in that fitted into the opening of the cross slit.
[0012]
Claim 2 is that the cross-sectional angle of the discharge groove provided in the cone member is formed with two sets of angles that are larger than the cross-sectional angle of the expanded portion and the opening angle is different. Sometimes, the expansion part of the anchor body and the surface of the discharge groove of the cone member do not hit, so that the driving resistance at the time of construction is lowered, and the reliability of construction and the striking force of construction may be small.
[0013]
Delete [0014]
Delete [0015]
Delete [0016]
Delete [0017]
Delete [0018]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 to FIG. 6 show the first embodiment, FIG. 1 is a perspective view showing a state in which the anchor body and the cone member are joined, and FIG. 2 is a perspective view showing a state in which the anchor body and the cone member are separated. 3A is a sectional view taken along the line aa in FIG. 2B, FIG. 3B is a sectional view taken along the line bb in FIG. 2B, FIG. 4 is a sectional view showing the expanded state of the anchor body, and FIG. FIG. 5B is a bottom view of FIG. 5A. 6 to 8 show a second embodiment, FIG. 6 is a perspective view showing a state in which the anchor body and the cone member are combined, FIG. 7A is a side view of the cone member, and FIG. FIG. 8 is a cross-sectional view taken along line cc in FIG. 7A.
[0019]
First Embodiment A first embodiment will be described with reference to FIGS. In FIG. 1, the anchor 11 is composed of an anchor main body 12 and a cone member 13, and the figure shows a state before being inserted into the concrete hole, and the cone member 13 is fitted to the tip of the anchor main body 12. It is in the state. In FIG. 2A, the anchor main body 12 is provided with a cross slit 14 along the axial direction from the distal end, and an expanded portion 15 that is equally divided into four by the cross slit 14 is formed at the base end. A female screw 16 is provided. The expanded portion 15 is a member having a fan shape divided into four by the cross slit 14, but the anchor outer peripheral portion that functions as an expanded portion of the anchor extends 90 degrees from the fan-shaped end portion 17 of each member. 18.
[0020]
In FIG. 2B, the cone member 13 is provided with a tapered outer peripheral portion 22 and a plurality of discharge grooves 20 in the axial direction of the tapered outer peripheral portion 22. Further, the cone member 13 is provided with a proximal end insertion portion 19 at the top of the tapered outer peripheral portion 22, and has a tapered shape having a proximal end small diameter portion 21 and a distal end large diameter portion 23 integrally formed with the proximal end insertion portion 19. Is formed. The distal end large diameter portion 23 is formed to have the same or slightly smaller diameter than the outer diameter of the anchor body 12. Further, the large distal end portion 23 is provided with a pedestal portion 25 having a smaller diameter than the large distal end portion 23 and smaller than the bottom of the discharge groove 20. The pedestal 25 is provided with a protrusion 24, which has the same angle as the edge angle of a concrete drill formed on the concrete hole bottom.
[0021]
In FIG. 3A, the groove bottom 26 of the discharge groove 20 when the cone member 13 is vertically cut has an arcuate shape slightly recessed in the axial direction of the cone member 13, and is different from the tapered outer peripheral portion 22 of the cone member 13. It is a curve. 3B, the V-shaped angle “Q” when the discharge groove 20 of the cone member 13 crosses is 110 degrees. In addition, since the V-shaped angle “T” formed by the cross slit 14 is 90 degrees in the fan-shaped angle of the expanded portion 15 of the anchor main body 12, the opening edge portion 27 of the cone member 13 is anchored during anchor construction. The structure is such that it does not come into contact with the expanded portion 15 of the main body 12. As a result, the anchor expanding operation is advanced while the fan-shaped end portions 17 of the respective members formed in the expanded portion 15 of the anchor body hit the groove bottom 26 of the discharge groove 20 formed in the cone member 13.
[0022]
When constructing the anchor of the first embodiment, the concrete is drilled using a concrete drill having a diameter about 0.5 to 1.0 mm larger than the anchor body. Since the anchor of the first embodiment is provided with the female thread 16 at the base end, when the device is attached to the concrete surface, the drilling depth is determined so that the head of the anchor body 12 does not come out on the concrete surface. . As shown in FIG. 1, the anchor 11 is inserted into the concrete hole with the cone member 13 fitted to the anchor main body 12, and when it is confirmed that the cone member 13 hits the bottom of the concrete hole, a hammer and driving treatment are performed. Type in with a tool.
[0023]
In FIG. 4, the depth of the groove bottom 26 of the discharge groove 20 provided in the cone member 13 is constant in the proximal end insertion portion 19, but is recessed in the axial direction from the proximal end small diameter portion 21 to the distal end large diameter portion 23. Since it has an arcuate shape, when the inner distal end portion 29 of the expanded portion 15 formed on the anchor main body 12 exceeds the proximal end small diameter portion 21, the expanded portion 15 is outside the proximal end insertion portion 19 of the cone member 13. The proximal end portion 28 and the inner distal end portion 29 of the fan-shaped end portion 17 come into contact with each other. Thereby, during construction of the anchor, the anchor body 12 and the cone member 13 do not hit the entire circumferential surface, so that driving resistance is reduced and the construction is facilitated.
[0024]
If the anchor body 12 and the cone member 13 are raw materials, there is a risk that the portion where the anchor body and the cone member are in contact with each other during construction, but if the cone member 13 is manufactured by cold heading, the surface hardness is reduced. It becomes higher and the biting phenomenon of both can be avoided. Moreover, since the projection part 24 of the same angle as the blade edge angle of the concrete drill is provided on the pedestal part 25 formed on the bottom part of the cone member 13, the axis of the cone member 13 may be shifted during the construction of the anchor. There is no.
[0025]
When the anchor 11 is constructed, the fan-shaped end portion 17 of the expanded portion 15 of the anchor body 12 advances along the groove bottom 26 of the cone member 13, and the outer front end portion 30 of the expanded portion 15 scrapes the concrete hole wall. However, the shaved dust or particles escape to the space formed by the pedestal 25 and the concrete hole wall using the discharge groove 20 of the cone member 13 as a route.
[0026]
In FIG. 5, although concrete is not shown, A shows a state in which the anchor 11 of the first embodiment is expanded in the concrete hole, and B shows a cone member 13 in which the expanded anchor 11 is viewed from the bottom. The expanded state of the expanded portion 15 is shown.
[0027]
Second Embodiment A second embodiment will be described with reference to FIGS. In FIG. 6, the anchor body 12 according to the second embodiment has the same structure as that of the first embodiment. However, the cone member 1313 is different from the first embodiment.
[0028]
As shown in FIG. 6, the distal end large diameter portion 2323 of the cone member 1313 is formed to have a smaller diameter than the outer diameter of the anchor main body 1212. In the second embodiment, from the gap formed between the anchor main body 1212 and the tip large-diameter portion 2323 of the cone member 1313, the outer tip 3030 of the expanded portion 1515 scrapes the concrete hole wall when the anchor is driven. The swarf or particles are allowed to escape to a space formed between the pedestal 2525 and the concrete hole wall.
[0029]
As shown in FIG. 7A, the length of the discharge groove 2020 of the cone member 1313 is rounded up at the tip large diameter portion 2323, and the tip large diameter portion 2323 has no discharge groove. As described above, since the outer diameter of the distal end large diameter portion 2323 is smaller than the outer diameter of the anchor main body 1212, the distal end of the expanded portion 1515 and the distal end large diameter of the cone member 1313 are formed in the concrete hole wall. Since a gap is formed between the portion 2323 and the second portion, in the second embodiment, a passage is provided to allow the shaved powder or particles to escape to the pedestal portion 2525.
[0030]
In FIG. 7B, the groove bottom 2626 of the discharge groove 2020 formed in the cone member 1313 has an arcuate shape that is slightly recessed in the axial direction of the cone member, as in the first embodiment. The structure is different from that of the first embodiment.
[0031]
The cross-sectional shape of the cone member 1313 shown in FIG. 8 is a characteristic structure of the second embodiment. The V-shaped angle “Y” when the cone member 1313 crosses the discharge groove 2020 is changed from “V” to “R” and reaches the opening edge 2727 of the discharge groove. Incidentally, the V-shaped angle “Y” is 130 degrees, and the V-shaped angle “R” is 70 degrees. For this reason, the discharge groove 2020 is formed by two planes having V-shaped angles of 130 degrees and 70 degrees. In the figure, “T” represents the transverse cross-sectional angle of the expanded portion 1515 of the anchor main body 1212, and the V-shaped angle “T” is 90 degrees.
[0032]
Also in the second embodiment, when the anchor 1111 is driven, only the fan-shaped end of the expanded portion 1515 of the anchor main body 1212 hits the groove bottom 2626 of the discharge groove 2020 of the cone member 1313, and the anchor main body 1212 and the cone member 1313. Since the entire surface is expanded without hitting, the driving resistance is reduced in this case, and the construction is facilitated.
[0033]
【The invention's effect】
<< 1 >> At the time of construction, since the expanded part of the anchor main body only hits the fan-shaped end that expands in a fan shape and the groove bottom of the discharge groove of the cone member, the inner diameter of the anchor main body and the tapered surface of the cone member are entirely Since the contact area is small compared to the hit, the driving resistance during construction is lowered, and the construction reliability and the striking force of the construction may be small.
<< 2 >> Since the concrete swarf or particles generated during the driving work are secured, a space for storing the shaved swarf or particles is formed. As a result, the expansion dimension of the anchor can be increased.
<< 3 >> Although the expanded portion of the anchor body is a fan-shaped portion of four equally formed by cross-shaped slits, the expanded dimension is an area from the fan-shaped end to the outer periphery, and the expanded portion of the conventional anchor body Since the expansion dimension can be made larger than the wall thickness due to the difference between the outer diameter and the inner diameter of the anchor body, it can be applied to concrete that has become old and has reduced compressive strength.
<< 4 >> The anchor main body has a cross-shaped fan-shaped end that moves along the bottom of the cone member discharge groove, and a projection that matches the shape of the concrete hole bottom at the bottom of the cone member. Therefore, there is no misalignment between the anchor main body and the cone member during construction, and the expanded portion of the anchor main body expands uniformly, thereby stabilizing the anchor strength.
[Brief description of the drawings]
FIG. 1 is a perspective view in which an anchor body and a cone member according to a first embodiment are combined.
FIG. 2A is a perspective view of an anchor main body of the first embodiment, and B is a perspective view of a cone member of the first embodiment.
3A is an aa cross-sectional view in FIG. 2B, and B is a bb cross-sectional view in FIG. 2B.
FIG. 4 is a sectional view showing an expanded state of the anchor body in the first embodiment.
5A is a perspective view showing a state in which an anchor according to the first embodiment is installed, and B is a bottom view of FIG. 5A. FIG.
FIG. 6 is a perspective view in which an anchor body and a cone member according to a second embodiment are combined.
7A is a side view of a cone member according to a second embodiment, and B is a cross-sectional view thereof. FIG.
8 is a cross-sectional view taken along the line cc in FIG. 7A.
FIG. 9 is a perspective view of a conventional anchor.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 11,1111 Anchor 12,1212 Anchor main body 13,1313 Cone member 14,1414 Cross slit 15,1515 Expanding part 16,1616 Female thread 17,1717 Fan-shaped end part 18 Anchor outer peripheral part 19 Base end insertion part 20,2020 Discharge groove 21 Base end small diameter part 22 Taper outer peripheral part 23, 2323 Tip large diameter part 24, 2424 Projection part 25, 2525 Base part 26, 2626 Groove bottom 27 Opening edge part 28 Outer base end part 29 Inner tip part 30 Outer tip part

Claims (2)

  The anchor is provided with an anchor body (12) provided with a cross slit (14) parallel to the axial direction from the solid shaft or the distal end of the reinforcing bar, a proximal small diameter portion (21), and a distal large diameter portion (23). And a cone member (13) provided with a number of discharge grooves (20) corresponding to the number of the cross slits in the axial direction of the taper outer peripheral part (22), and divided into the anchor body by the cross slits. The widened portion (15) is formed, and the discharge groove of the cone member has an arcuate shape in which the groove bottom (26) is recessed in the axial direction, and extends from the proximal small diameter portion to the distal large diameter portion. A pedestal portion (25) formed continuously and having a smaller diameter than the groove bottom portion of the discharge groove is provided at the large diameter portion of the tip, and the cross section angle of the discharge groove is larger than the cross section angle of the widened portion. The base end small diameter portion of the cone member is formed on the anchor Body impact-type anchor, characterized in that fitted into the opening of the cross slit of the body.   The anchor has an anchor main body (1212) provided with a cross slit (1414) parallel to the axial direction from the solid shaft or the distal end of the reinforcing bar, a proximal small diameter portion (2121), and a distal large diameter portion (2323). And a cone member (1313) provided with a number of discharge grooves (2020) corresponding to the number of the cross slits in the axial direction of the tapered outer peripheral portion (2222) having An expanded portion (1515) is formed, and the discharge groove of the cone member is formed until the groove bottom (2626) reaches from the proximal small diameter portion to the vicinity of the distal large diameter portion, and the distal large diameter portion is A pedestal portion (2525) having a smaller diameter than the outer diameter of the anchor main body and having a smaller diameter than the bottom of the discharge groove is provided at the tip large diameter portion, and the cross-sectional angle of the discharge groove is transverse to the expansion portion. From surface angle A main body driving type anchor formed by two sets of angles having a large angle and different opening angles, wherein the base end small-diameter portion of the cone member is fitted into the opening portion of the cross slit of the anchor main body. .

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