KR101773004B1 - Post-installed concrete anchor with shear reinforcement - Google Patents
Post-installed concrete anchor with shear reinforcement Download PDFInfo
- Publication number
- KR101773004B1 KR101773004B1 KR1020150064263A KR20150064263A KR101773004B1 KR 101773004 B1 KR101773004 B1 KR 101773004B1 KR 1020150064263 A KR1020150064263 A KR 1020150064263A KR 20150064263 A KR20150064263 A KR 20150064263A KR 101773004 B1 KR101773004 B1 KR 101773004B1
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- South Korea
- Prior art keywords
- female screw
- screw member
- concrete
- anchor
- anchor rod
- Prior art date
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- 239000004567 concrete Substances 0.000 title claims abstract description 103
- 230000002787 reinforcement Effects 0.000 title 1
- 238000000034 method Methods 0.000 claims description 3
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 230000003014 reinforcing effect Effects 0.000 abstract description 23
- 238000009434 installation Methods 0.000 abstract description 20
- 235000013527 bean curd Nutrition 0.000 abstract description 7
- 238000005336 cracking Methods 0.000 abstract description 5
- 239000011440 grout Substances 0.000 description 14
- 229910000831 Steel Inorganic materials 0.000 description 13
- 239000010959 steel Substances 0.000 description 13
- 238000010008 shearing Methods 0.000 description 7
- 238000010276 construction Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 230000000452 restraining effect Effects 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 238000004873 anchoring Methods 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
Images
Classifications
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/38—Connections for building structures in general
- E04B1/41—Connecting devices specially adapted for embedding in concrete or masonry
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/38—Connections for building structures in general
- E04B1/41—Connecting devices specially adapted for embedding in concrete or masonry
- E04B1/4114—Elements with sockets
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/38—Connections for building structures in general
- E04B1/48—Dowels, i.e. members adapted to penetrate the surfaces of two parts and to take the shear stresses
- E04B1/483—Shear dowels to be embedded in concrete
Abstract
A shear performance reinforced post-installed concrete anchor is disclosed. The shear performance reinforcing after-installation concrete anchor of the present invention is used as a grouted anchor for attaching an adherend to a hard concrete. The anchor rod is inserted into a hole of a hardened concrete from an end thereof, ; A first female screw member which is screwed with the anchor rod and inserted into the hole of the hardened concrete; And a second female screw member which is screwed to the anchor rod on the other end side of the anchor rod with respect to the first female screw member and relatively rotates in a direction opposite to the first female screw member to form an interfitting force with each other, And the second female screw member absorb the shear force formed around the joint surface between the hardened concrete and the attachment. According to the present invention, by providing an anchor rod having no tofu, it is possible to reduce the perforation diameter of the toothed bolt, thereby improving workability of the perforating work and suppressing cracking of the concrete, And to provide a shear performance reinforcing after-installation concrete anchor which is made to improve the resistance against the combined forces of the two.
Description
BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a shear performance reinforcing post-installed concrete anchor, and more particularly, to a shear performance reinforcing type anchor for improving workability and resistance to combined forces of tensile force, shear force, To an installed concrete anchor.
Concrete anchors are widely used for reinforcing or expanding existing concrete structures, fixing heavy structures or steel structures, and attaching steel columns or turbine generator devices of construction structures to concrete structures.
The anchor is loaded by the attachment of the first anchor, the load applied to the attachment is transferred to the anchor by frictional force, mechanical lock, attachment or a combination of these and then transferred to the concrete structure through the anchor. The force exerted on the anchor by the attachment is represented by a tensile force, a shear force, or a combined force of both.
Anchors can be roughly classified into cast-in-place anchors and post-installed anchors.
Pre-installed anchors are installed on-site, and include ordinary bolts, J or L bolts, grooved bars, reinforced steel bars, grooved inserts, and stud welded steel plates.
Post-installation anchors are used in a manner that is installed after installation, and are divided into bonded anchors and expansion anchors. Attached anchors include grouted anchors and chemical anchors.
The grouted anchor is installed in the hole drilled in the concrete and the hole is filled with sand grout or other mixed grout. The grouted anchors are divided into bolts with tofu, bolts without tofu, and steel bars with screw grooves.
In order to install grouted anchors, drill holes should be drilled in concrete. If holes are drilled too much to install bolt with head, cracks will be generated inside of concrete, The work of delaying the work time due to the increase of the grout amount and the increase of the hardening time of the grout is likely to cause a problem that the hole having a diameter larger than the head is punctured uniformly in the vertical direction, And the like.
In order to solve the above problems, the applicant of the present invention has found that by providing a steel bar with no bolt or screw groove having no toe, it is possible to improve the workability of the boring operation and to suppress the crack of concrete, After applying the tensile force, shear force and resistance to the combined forces of both, which were applied to the anchor, the technique of the installed concrete anchor was sought.
It is an object of the present invention to provide an anchor rod having no tofu to reduce the perforation diameter of the toothed bolt, thereby improving workability of the perforating work and suppressing cracking of the concrete, Shear force and the resistance against the combined forces of the two.
According to the present invention, there is provided an anchor rod used as a grouted anchor for attaching an adherend to a hard concrete, having an outer circumferential surface formed with a thread groove and inserted into the hole of the hardened concrete from one end thereof; A first female screw member that is screwed with the anchor rod and inserted into the hole of the hardened concrete; And a second female screw member which is screwed to the anchor rod on the other end side of the anchor rod with respect to the first female screw member and relatively rotates in a direction opposite to the first female screw member to form an inter- Wherein the first and second female screw members absorb the shear force formed around the joint surface between the hardened concrete and the attachment.
Wherein the attachment is made of a steel material and includes a third female screw member which is screwed with the anchor rod on the opposite side of the second female screw member with respect to the attachment, and the second female screw member and the third female screw member So as to be brought into close contact with the steel material.
The attachment is formed of newly laid concrete, the first female screw member is longer than the second female screw member, and the joint surface between the hardened concrete and the attachment is formed between both ends of the first female screw member .
Wherein an outer peripheral surface of the first female screw member and the second female screw member is formed with a concave and convex portion repeated in the longitudinal direction of the convex portion and the concave portion, So that a hexagon can be formed.
Each of the contact surfaces on which the first female screw member and the second female screw member are brought into close contact with each other is provided with a plurality of first inclined surfaces contacting with each other in the relative rotation in the direction in which the first female screw member and the second female screw member come close to each other, Wherein a plurality of second inclined surfaces, which are in contact with each other in a direction of relative rotation away from each other, are formed between the first female screw member and the second female screw member and the second inclined surface, The angle of rotation with respect to the direction of rotation of the motor can be made large.
According to the present invention, since the first female screw member and the second female screw member relatively rotate in opposite directions to form an interfacial adhesion force and absorb the shear force formed around the joint surface between the hardened concrete and the attachment, It improves workability of drilling work and suppresses cracking of concrete by decreasing drilling diameter compared to bolt with head, but also enhances tensile force and shear force applied to anchors and resistance against combined force of two. It is possible to provide a shear performance reinforced after-installation concrete anchor which is made to be made as small as possible.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view showing a state in which a shear performance reinforcing post-installed concrete anchor according to an embodiment of the present invention is installed. FIG.
Fig. 2 is a view showing a load applied to the anchor of the post-performance reinforcing type post-installed concrete of Fig. 1; Fig.
3 is a view showing a state in which a shear performance reinforcing post-installed concrete anchor according to another embodiment of the present invention is installed.
Fig. 4 (a) is a view showing a first female screw member and a second female screw member of the shear performance reinforcing type post-installed concrete anchor of Fig. 1; Fig.
Fig. 4 (b) is a view showing the first female screw member of the shear performance reinforcing type post-installed concrete anchor of Fig. 3; Fig.
FIG. 5 is a view showing a concrete anchor of a post-performance reinforcing type post-installation according to another embodiment of the present invention. FIG.
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, the well-known functions or constructions are not described in order to simplify the gist of the present invention.
The shear performance reinforced post-installation concrete anchor according to the present invention is characterized in that an anchor rod having no tofu is installed to reduce the diameter of the perforation compared to the bolt having a head to improve the workability of the perforating work and to suppress the occurrence of cracks in the concrete, The tensile force applied to the anchor, the shear force, and the resistance against the combined forces of both are improved.
FIG. 1 is a view showing a state in which a shear performance reinforcing post-installed concrete anchor according to an embodiment of the present invention is installed, FIG. 2 is a view showing a load applied to a post- Fig. 4 (a) is a sectional view of the first and second female screws of the post-performance-reinforcing post-installed concrete anchor of Fig. 1, Fig. FIG. 4 is a view showing a first female screw member of a post-performance-reinforcing post-installed concrete anchor in FIG. 3, FIG. 5 is a view showing a shear performance reinforcing post-installation concrete according to another embodiment of the present invention, Fig.
As shown in FIG. 1, the shear performance reinforcing after-installation concrete anchor 1 according to an embodiment of the present invention is used as an anchor for grouting in a post-installation anchor to improve workability, TF, the shearing force SF and the combined force of the two, and comprises an anchor rod AR, a first female screw member N1 and a second female screw member N2. In order to facilitate understanding, the upper and lower portions will be described below in the state shown in the drawings.
As shown in Fig. 1, the anchor rod AR is provided with a bolt or a threaded groove of a grooved anchor, which is free from head. 1 to 5, grout is not shown around the anchor rod AR for easier understanding, but it should be understood that the anchor rod AR in the present invention is installed in a grout-filled hole as a grouted anchor.
As shown in FIG. 1, the anchor rod AR is inserted into a hole of a hardened concrete (C1) from one end, and a screw groove is formed on the outer circumferential surface along the longitudinal direction.
Concrete anchors (1) are widely used for reinforcing or expanding existing concrete structures, for fixing heavy structures or steel structures, and for attaching steel columns or turbine generator devices of construction structures to concrete structures.
The anchor is loaded by the attachment (M) of the anchor that is firstly embedded, and the load applied to the attachment (M) is transmitted to the anchor by friction force, mechanical lock, attachment or a combination thereof, To the structure. The force exerted on the anchor by the attachment M appears as a tensile force (TF), a shear force (SF), or a combined force of both.
Anchors can be roughly classified into cast-in-place anchors and post-installed anchors.
Post-installation anchors are used in a manner that is installed after installation, and are divided into bonded anchors and expansion anchors. Attached anchors include grouted anchors and chemical anchors.
The grouted anchor is installed in the hole drilled in the concrete and the hole is filled with sand grout or other mixed grout. The grouted anchors are divided into bolts with tofu, bolts without tofu, and steel bars with screw grooves.
In order to install grouted anchors, drill holes should be drilled in concrete. If holes are drilled too much to install bolt with head, cracks will be generated inside of concrete, The work of delaying the work time due to the increase of the grout amount and the increase of the hardening time of the grout is likely to cause a problem that the hole having a diameter larger than the head is punctured uniformly in the vertical direction, And the like.
The shear performance reinforced post-installation concrete anchor (1) of the present invention comprises a bolt without a head or a pair of female screw members joined to a steel bar with a threaded groove, thereby improving workability of the boring operation and suppressing cracking of the concrete, It is possible to improve the shear performance with respect to the shear force SF formed around the joint surface F1 between the concrete C1 and the adherend M which is harder than the bolt having the bolt.
The first female screw member N1 and the second female screw member N2 are screwed to the anchor rod AR and inserted into the hole of the hardened concrete C1 together with the anchor rod AR .
4A, the first female screw member N1 and the second female screw member N2 are formed with threaded holes to be screwed into the anchor rod AR, It is preferable that the outer surface is machined into a hexagonal shape so as to be screwed onto the inner surface AR. Of course, a common nut may be used for the first female screw member N1 and the second female screw member N2.
1, the second female screw member N2 is screwed with the anchor rod AR at the other end of the anchor rod AR, that is, on the upper end side in the illustrated state, with respect to the first female screw member N1. The first female screw member N1 and the second female screw member N2 are screwed to the anchor rod AR so as to rotate relative to each other in opposite directions to form an interfacial adhesion force.
As shown in FIG. 1, in an embodiment of the present invention, the attachment M is made of a steel material, and the shear performance reinforcing after-installation concrete anchor 1 according to an embodiment of the present invention includes an attachment M And a third female screw member N3 screwed to the anchor rod AR on the opposite side of the second female screw member N2 as a reference. A common nut is used for the third female screw member (N3).
1, the first female screw member N1 and the second female screw member N2 are relatively rotated in opposite directions in a state of being screwed to the anchor rod AR, The upper surface and the lower surface of the second female screw member N2 come into close contact with each other to be fixed to one longitudinal side of the anchor rod AR so that the anchor rod AR and the first female screw member N1 and the second female screw member N2 ) Is eliminated and the integrated behavior of the anchor rod AR, the first female screw member N1 and the second female screw member N2 is secured.
The anchor rod AR is inserted into the hole of the hardened concrete C1 in a state where the first female screw member N1 and the second female screw member N2 are fixed to one side in the longitudinal direction and grooves .
The anchor rod AR is disposed in the hole of the hardened concrete C1 so that the upper surface of the second female screw member N2 is parallel to the surface of the hardened concrete C1 when the hardening of the grout is completed and the hardened concrete (C1).
When the grouting is completed, the deposit M is installed. A hole through which the upper end of the anchor rod AR passes is formed in the deposit M and the bottom surface of the deposit M is fixed to the surface of the hardened concrete C1 with the upper end portion of the anchor rod AR passing through the hole (Hereinafter referred to as " bonding surface F1 ").
1, the third female screw member N3 is screwed to the upper end of the anchor rod AR by means of a tool such as a wrench and is brought into close contact with the upper surface of the attachment M so that the first female screw member The first female screw member N1, the second female screw member N2, the attachment M and the third female screw member N3 are in close contact with each other between the adjacent structures along the longitudinal direction of the anchor rod AR, .
2 (a), when a horizontal force (shearing force SF) acts on the upper end portion of the conventional anchor rod AR, the moment induced by the anchor rod AR embedded in the hardened concrete C1 and the shear force (SF) shows a large value at the joint surface (F1) near the ground surface, but shows a tendency to converge with decreasing depth.
As shown in FIG. 2 (b), when a post-installation anchor is used for reinforcing, enlarging, fixing and attaching a structure having a horizontal force F dominantly, There is a problem that the anchor rod AR of the bushing 1 is warped or sheared.
2 (c), the shear performance reinforcing after-installation concrete anchor 1 of the present invention has a first female screw member N1 and a second female screw member N2 Is fixed so as to surround the periphery of the anchor rod AR to absorb the shear force SF formed around the joint surface F1 between the hardened concrete C1 and the adherend M and to reduce the applied stress transmitted to the concrete Thereby solving the above-described problems.
2 (d), the shear performance reinforcing after-installation concrete anchor 1 according to the present invention is designed such that the load of the adherend M and the external force F of the adherend M After the concrete is broken, the tensile force (TF) acting on the anchor rod (AR) and the frictional deformation due to the leverage acting by the ground pressure between the first female screw member (N1) and the hardened concrete (C1) (AR).
2 (d), the shear performance-reinforcing post-installed concrete anchor 1 of the present invention has a structure in which the first female screw member N1 and the second female screw member N2 Is fixed to one side in the longitudinal direction of the anchor rod (AR) by the coercive force by the relative rotation, thereby preventing the female screw member from being detached from the abutting surface (F1) by rotation by the shear force (SF).
4A, the diameters of the first female screw member N1 and the second female screw member N2 are formed to be approximately twice the diameter of the anchor to form a sufficient resistance against the shearing force SF, The lengths of the member N1 and the second female screw member N2 are approximately equal to the diameter of the anchor.
As shown in Fig. 4 (a), on the outer surfaces of the first female screw member N1 and the second female screw member N2, convex portions U1 and concave portions U2 are repeated in the longitudinal direction U) is formed. When the concave and convex portions U are formed on the outer surfaces of the first female screw member N1 and the second female screw member N2, the adhered force with the hardened grout is improved, and the tensile force TF causes the longitudinal direction of the anchor 1 There is an advantage that flow is blocked.
As described above, since the outer surfaces of the first female screw member N1 and the second female screw member N2 are formed into a hexagonal shape, the outer surface of the convex portion U1 forming the outermost surface of the concave / By forming the hexagonal shape, even if the concave and convex portions U are formed on the outer surfaces of the first and second female screw members N1 and N2, the screw and the anchor rod AR can be screwed together by a tool such as a wrench.
On the other hand, as shown in Fig. 5 (a), on each of the contact surfaces F2 where the first female screw member N1 and the second female screw member N2 are in close contact with each other, the first female screw member N1, A plurality of first inclined faces F2A and a first female screw member N1 and a second female screw member N2 which are in contact with each other during a relative rotation in the direction in which the female screw members N2 approach each other A plurality of second inclined faces F2B may be formed.
The first inclined face F2A and the second inclined face F2B can be formed by repeatedly cutting one surface of a female screw member or a common nut along the circumferential direction by using a machine tool such as a lathe.
5A, the second inclined face F2B is inclined with respect to the rotational direction of the first female screw member N1 and the second female screw member N2 (hereinafter referred to as "horizontal direction") than the first inclined face F2A, Quot;). The first inclined plane F2A and the second inclined plane F2B are formed at an angle of not more than 45 degrees with respect to the first inclined plane F2A and at an angle of about 90 with respect to the horizontal direction.
When the first female screw member N1 and the second female screw member N2 are relatively rotated in the direction of approaching each other, the first inclined faces F2A, which are oblique to each other due to the rotational force of a tool such as a wrench, do.
5 (b), when the shearing force SF relatively rotating in the direction away from the first female screw member N1 and the second female screw member N2 acts on the first inclined face F2A, The second female screw member N1 and the second female screw member N2 are held fixed to one side of the anchor rod AR by the first and second inclined faces F2B and F2B.
The first female screw member N1 and the second female screw member N2 are fixed to one side of the anchor rod AR by restraining relative rotation between the second inclined plane F2B described above, The upper surface of the first female screw member N1 and the second female screw member N2 form a horizontal plane with the abutting surface F1 is firmly held and thereby the anchor rod AR is slid by the slip between the first female screw member N1 and the second female screw member N2 The shear breakage phenomenon is prevented.
As shown in FIG. 3, when the adherend M is made of the newly installed concrete C2, a shear performance reinforcing after-
The first anchoring member N1 is formed to be longer than the second female screw member N2 and the hardened concrete C1 and the newly installed
The first female screw member N1 and the second female screw member N2 are screwed to the anchor rod AR and a part of the first female screw member N1 is connected to the anchor rod AR And is inserted into the hole of the hardened concrete (C1).
4 (b), the first female screw member N1 and the second female screw member N2 have a structure in which a screw hole is screwed into the anchor rod AR, It is preferable that the outer surface is machined into a hexagonal shape so as to be screwed onto the inner surface AR. The second female screw member N2 is not shown in FIG. 4 (b), but is formed in the same shape as the second female screw member N2 shown in FIG. 4 (a).
Referring to Fig. 4 (b), the diameter of the first female screw member N1 is formed to be approximately twice the diameter of the anchor to form a sufficient resistance against the shearing force SF, and the length of the first female screw member N1, Is formed to be three times or more of the anchor diameter so as to reinforce the peripheral portion concrete of the anchor rod (AR) of the joint surface (F1) on which the grooves (SF) are concentrated with a sufficient depth in the vertical direction.
3, the second female screw member N2 is screwed with the anchor rod AR at the other end of the anchor rod AR, that is, at the upper end side in the illustrated state, with respect to the first female screw member N1 The first female screw member N1 and the second female screw member N2 are screwed to the anchor rod AR so as to rotate relative to each other in opposite directions to form an interfacial adhesion force.
3, the first female screw member N1 and the second female screw member N2 are relatively rotated in opposite directions in a state of being screwed to the anchor rod AR, The upper surface and the lower surface of the second female screw member N2 come into close contact with each other to be fixed to one longitudinal side of the anchor rod AR so that the anchor rod AR and the first female screw member N1 and the second female screw member N2 ) Is eliminated and the integrated behavior of the anchor rod AR, the first female screw member N1 and the second female screw member N2 is secured.
When the first female screw member N1 and the second female screw member N2 are in close contact with each other, the total length of the first female screw member N1 and the second female screw member N2 is about four times or more the diameter of the anchor.
The anchor rod AR is inserted into the hole of the hardened concrete C1 in a state where the first female screw member N1 and the second female screw member N2 are fixed to one side in the longitudinal direction and grooves .
The anchor rod AR is disposed in the hole of the hardened concrete C1 such that the middle of the entire length of the first female screw member N1 and the second female screw member N2 is positioned on the contact surface when the grout hardening is completed, Thereby forming a bonding force with the hardened concrete C1.
When the grouting is completed, a new concrete (C2) is placed above the hardened concrete (C1), and the bottom surface of the newly installed concrete (C2) forms a joining surface (F1) with the surface of the hardened concrete .
3, the shear performance reinforcing post-installed
The shear performance reinforcing after-
In addition, the shear performance reinforcing after-
As shown in Fig. 4 (b), concave and convex portions U are formed on the outer surface of the first female screw member N1, in which the convex portions U1 and the concave portions U2 are repeated in the longitudinal direction. When the concave and convex portions U are formed on the outer surface of the first female screw member N1, the adhesion of the hardened grout and the newly installed concrete C2 is improved and the tensile force TF is applied to the
5, a first female screw member N1 and a second female screw member N2 are connected to each other on respective contact surfaces F2 where the first female screw member N1 and the second female screw member N2 are in close contact with each other A plurality of first inclined faces F2A contacting with each other in a relative rotation in a direction in which the first and second female screw members N1 and N2 contact each other and a plurality of second inclined faces F2B contacting the first and second female screws N2, May be formed. The detailed description thereof is the same as that of the embodiment of the present invention and therefore will be omitted.
According to the present invention, the first female screw member N1 and the second female screw member N2 relatively rotate in opposite directions to form an interfacial adhesion force, and the contact between the hardened concrete C1 and the adherend M The anchor rod AR having no toe is installed to reduce the diameter of the perforation compared to the bolt having the head to improve the workability of the perforating work and to suppress cracking of the concrete, (1, 2) of reinforced shear performance installed so that tensile force (TF) applied to an anchor, shear force (SF) applied to an anchor, and resistance against combined forces are improved.
While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It is obvious to those who have. Accordingly, it should be understood that such modifications or alterations should not be understood individually from the technical spirit and viewpoint of the present invention, and that modified embodiments fall within the scope of the claims of the present invention.
1,2: concrete anchor C1: hard concrete
AR: Anchor load C2: Concrete poured
N1: first female screw member M: attachment
U: concave / convex portion F1:
U1: convex portion TF: tensile force
U2: recess SF: shear force
N2: second female screw member
F2: close face
F2A: first inclined surface
F2B: second slope
N3: third female thread member
Claims (5)
An anchor rod having a thread groove formed on an outer peripheral surface along the longitudinal direction and inserted into the hole of the hardened concrete from one end;
A first female screw member that is screwed with the anchor rod and inserted into the hole of the hardened concrete; And
And a second female screw member that is screwed to the anchor rod on the other end side of the anchor rod with respect to the first female screw member and relatively rotates in a direction opposite to the first female screw member to form an inter-
The first female screw member and the second female screw member absorb a shear force formed around the joint surface between the hardened concrete and the attachment,
The attachment is provided with newly laid concrete,
Wherein the first female screw member is longer than the second female screw member,
Wherein the joint surface between the hardened concrete and the attachment is formed between both ends of the first female screw member.
Wherein the first female screw member and the second female screw member are formed on the outer surface thereof with concave and convex portions repeated in the longitudinal direction thereof,
Wherein an outer surface of the convex portion is formed in a hexagonal shape so as to be rotatable by a tool of the first and second female screw members.
Each of the contact surfaces on which the first female screw member and the second female screw member are brought into close contact with each other is provided with a plurality of first inclined surfaces contacting with each other in the relative rotation in the direction in which the first female screw member and the second female screw member come close to each other, A plurality of second inclined surfaces, which are in contact with each other during a relative rotation in a direction in which the first female screw member and the second female screw member are apart from each other,
Wherein the second inclined surface has a larger angle of incidence with respect to a rotation direction of the first female screw member and the second female screw member than the first inclined surface.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020150064263A KR101773004B1 (en) | 2015-05-08 | 2015-05-08 | Post-installed concrete anchor with shear reinforcement |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020150064263A KR101773004B1 (en) | 2015-05-08 | 2015-05-08 | Post-installed concrete anchor with shear reinforcement |
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| Publication Number | Publication Date |
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| KR20160131558A KR20160131558A (en) | 2016-11-16 |
| KR101773004B1 true KR101773004B1 (en) | 2017-08-31 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102423557B1 (en) | 2021-06-16 | 2022-07-20 | 한양대학교 산학협력단 | Reinforcemnet structure for anchoring part using anchor extention |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20190007137A (en) | 2017-07-11 | 2019-01-22 | 심현일 | Cast-in-place anchor structures for installing facilities on concrete |
| CN107558615B (en) * | 2017-09-06 | 2020-05-22 | 河海大学 | Friction type steel shear connector and construction method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102423557B1 (en) | 2021-06-16 | 2022-07-20 | 한양대학교 산학협력단 | Reinforcemnet structure for anchoring part using anchor extention |
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| Publication number | Publication date |
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| KR20160131558A (en) | 2016-11-16 |
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