Anchor testing device

Abstract

To provide an anchor testing device having a simple structure, light weight, suitable for use in a strength test of an anchor embedded in a structural body on a deck plate, and capable of efficiently conducting the strength test of the anchor.SOLUTION: An anchor testing device 1, which performs a pull-out test on an anchor embedded in a structural body, includes a base 2 having a support plate 10 supported by a plurality of legs 11, 11, a tension member 5 having a nut 5b attached to the tip of a shaft portion 5a which is inserted into an insertion hole 10a formed in the support plate 10, a fuse member 7 which is attached to the nut 5b and has a breaking portion 23 which breaks when a tensile force of a predetermined value or more is applied in the axial direction, and a tightening nut 8 which is attached to the rear end of the shaft portion 5a which protrudes outward from the base 2 from the insertion hole 10a formed in the support plate 10. When the tightening nut 8 is tightened with the fuse member 7 attached to the anchor, a tensile force is applied to the anchor via the fuse member 7.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to an anchor testing device for conducting strength tests on anchors embedded in a building structure. [Background technology]

[0002] In buildings such as buildings and factories, concrete is poured on top of a deck plate to form the structure that will become the floor slab. The space below the floor slab becomes the ceiling space for the floor below. In this ceiling space, various devices such as air conditioners are installed in a suspended state via suspension bolts, etc. In order to install the devices in a suspended state, post-installed anchors are installed in the structure, and suspension bolts, etc. are attached to the anchors.

[0003] Conventionally, there is known a device for testing whether an anchor embedded in a building frame is fixed with an appropriate strength (for example, Patent Document 1). In this conventional testing device, an anchor fixed to a building frame is connected to a center shaft via a coupling, and the resistance and displacement of the anchor against a tensile load are measured. The center shaft is inserted into a cylindrical tension member, and a shaft nut is screwed to the upper part in contact with the upper end surface of the tension member. The tension member is disposed penetrating the center of a base, and the base is supported by a plurality of supports. A load nut is screwed to the outer peripheral thread of the tension member. When the load nut is tightened, the tension member pulls up the center shaft, pulling the anchor in the direction of removal. The applied load at this time is measured by a load cell, and the displacement of the anchor is measured by a potentiometer-type displacement meter. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 10-185769 Summary of the Invention [Problem to be solved by the invention]

[0005] However, conventional testing equipment uses a load cell and a potentiometer-type displacement gauge to perform strength tests on anchors, and therefore requires a separate display to read and display the electrical signals output from the load cell and potentiometer-type displacement gauge. Therefore, when performing a strength test, it is necessary to tighten the load nut while checking the displayed value on the display, which causes a problem of time-consuming work.

[0006] In addition, strength testing of anchors embedded in the structure (floor slab) formed on the ceiling deck plate requires high-altitude work in the ceiling space of the floor below, making it difficult to secure sufficient work space. Therefore, there is also the problem that it is difficult to tighten the load nuts while checking the display value when working at a high altitude, which significantly reduces work efficiency.

[0007] In addition, the conventional test equipment has a complex structure, and the equipment itself is heavy. Therefore, it is dangerous to attach the conventional test equipment to the deck plate at a height, and it is not suitable for strength testing of anchors embedded in the structure on the deck plate.

[0008] Therefore, the present invention is made to solve the above problems, and has an object to provide an anchor testing device that has a simpler structure and is lighter than conventional devices, can be suitably used for strength tests of anchors embedded in a structure on a deck plate, and can efficiently perform strength tests. [Means for solving the problem]

[0009] In order to achieve the above-mentioned object, firstly, the present invention provides an anchor testing device for performing a pull-out test on an anchor embedded in a structural body, the device comprising: a base having a support plate supported at a predetermined distance from a surface of the structural body by a plurality of legs; a tension member inserted into an insertion hole formed in the support plate; a fuse member provided at a tip of the tension member and having a breaking portion that breaks when a tensile force of a predetermined value or more is applied to the fuse member in the axial direction; and a tightening nut attached to a rear end of the tension member that protrudes from the insertion hole formed in the support plate to the outside of the base, the tightening nut being tightened with the fuse member attached to the anchor, so that the tension member applies a tensile force to the anchor via the fuse member.

[0010] Secondly, the present invention is characterized in that the anchor testing device having the first configuration further includes a rotation prevention member between the plurality of legs for contacting an outer circumferential surface of the tension member to prevent the tension member from rotating.

[0011] Thirdly, the present invention provides an anchor testing apparatus having the second configuration, characterized in that the anti-rotation member is a tubular body having rectangular openings at the top and bottom, and allows the tension member to incline in the direction of the long side of the rectangle.

[0012] Fourthly, the present invention provides the anchor testing device having the second configuration, characterized in that the anti-rotation member is attached to the plurality of legs so as to be able to swing and can assume an angular posture according to the inclination of the tension member.

[0013] Fifth, the present invention provides an anchor testing device having the third configuration, characterized in that the anti-rotation member is attached to the plurality of legs so as to be able to swing, and can be set to an angular posture corresponding to the inclination of the tension member.

[0014] Sixthly, the present invention provides an anchor testing device having any of the first to fifth configurations, further comprising a spherical washer provided between the support plate and the clamping nut.

[0015] Seventhly, the present invention provides an anchor testing device having any one of the first to fifth configurations, further comprising a magnet provided at the tip of the leg portion.

[0016] Eighth, the present invention provides the anchor testing device having the sixth configuration, further comprising a magnet provided at the tip of the leg portion.

[0017] Ninthly, the present invention is an anchor testing device having any of the first to fifth configurations, characterized in that the shank is provided with a stopper member for preventing the breaking portion from coming out of the insertion hole when the breaking portion breaks. Effect of the Invention

[0018] According to the present invention, the structure is simpler and lighter than the conventional structure, and can be suitably used for strength testing of anchors embedded in the structure on the deck plate, and the strength testing can be performed efficiently. In particular, when performing a strength test of an anchor embedded in the structure on the deck plate of a ceiling, the strength test can be performed safely and efficiently. [Brief description of the drawings]

[0019] [Figure 1] FIG. 1 shows an anchor testing device. [Diagram 2] FIG. 2 is a cross-sectional view of an anchor testing device. [Diagram 3] FIG. [Figure 4] FIG. 1 is a diagram illustrating an example of an anchor that is a subject of a strength test. [Diagram 5] FIG. 2 is a diagram showing a state in which the anchor testing device is attached to the anchor. [Figure 6]FIG. 1 is a diagram showing an example of an anchor strength test performed by an anchor testing device. [Figure 7] FIG. 1 is a diagram showing an example of an anchor strength test performed by an anchor testing device. [Figure 8] FIG. 1 is a diagram showing an example of an anchor strength test performed by an anchor testing device. [Figure 9] FIG. 13 is a diagram showing an example of an anchor strength test performed when the shaft portion of the anchor is inclined. [Figure 10] FIG. 13 is a diagram showing another example of performing an anchor strength test when the shaft portion of the anchor is inclined. [Figure 11] FIG. 1 is a diagram showing a configuration example of an anchor testing device provided with a retaining member. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0020] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. In the drawings referred to below, common members are designated by the same reference numerals, and redundant description thereof will be omitted.

[0021] Fig. 1 shows an anchor testing device 1 according to an embodiment of the present invention, where (a) is a perspective view, (b) is a front view, and (c) is a side view. Fig. 2 shows cross-sectional views of the anchor testing device 1, where (a) shows the BB cross section shown in Fig. 1(c) and (b) shows the AA cross section shown in Fig. 1(b). The anchor testing device 1 is a device for conducting a pull-out test of an anchor 30 (see Fig. 4) embedded in the skeleton of a building. This anchor testing device 1 includes a base 2, an anti-rotation member 3, a spherical washer 4, a tension member 5, a fuse member 7, and a tightening nut 8.

[0022] The base 2 has a support plate 10 supported by a plurality of legs 11, 11 at a position at a predetermined distance from the surface of the body. For example, the plurality of legs 11, 11 are made of a metal plate, and their base ends are joined to the support plate 10. The base 2 of this embodiment has two legs 11, 11. However, this is not limited to this, and the number of legs 11, 11 may be three or more. In addition, the base 2 may have a connecting member that connects the two legs 11, 11 to each other. The support plate 10 is made of a rectangular metal plate. An insertion hole 10a for inserting the tension member 5 is formed in the center of the support plate 10.

[0023] Further, the tips (upper ends) of the multiple legs 11, 11 have flat plate portions 11a, 11a bent at a substantially right angle toward the outside of the base 2. The multiple legs 11, 11 have magnets 9, 9 provided on the upper surface side of the flat plate portions 11a, 11a.

[0024] The anti-rotation member 3 is configured as a cylindrical body with rectangular openings at the top and bottom, and has a space 3a inside into which the tension member 5 can be inserted. Bolts 13 are attached to both ends of the anti-rotation member 3, as shown in FIG. 2(a). The bolts 13 pass through the legs 11, 11 of the base 2, and nuts 14, 14 are attached to the outside of the legs 11, 11. As a result, the anti-rotation member 3 is held at a height position at the center of the legs 11, 11, and is held swingably in a swing direction R1 around the axis 13a of the bolts 13, 13, as shown in FIG. 1(a).

[0025] The spherical washer 4 includes a concave member 4a and a convex member 4b. The concave member 4a has a through hole 4d formed in the center, and a spherical concave portion formed on its lower surface. The convex member 4b has a through hole 4e formed in the center, and a spherical convex portion formed on its upper surface. A nut-shaped convex portion 4c is integrally formed on the lower surface of the convex member 4b. The spherical washer 4 is arranged with the upper surface of the concave member 4a joined to the support plate 10 of the base 2, and with the convex portion of the convex member 4b joined to the concave portion of the concave member 4a.

[0026] The tension member 5 has a shaft portion 5a and a nut 5b attached to the tip of the shaft portion 5a. A male screw is formed on the outer peripheral surface of the shaft portion 5a. The nut 5b is a long nut having a predetermined length in the axial direction, and a female screw is formed on the inside. One end of the nut 5b is attached to the tip of the shaft portion 5a. That is, the tip of the shaft portion 5a is screwed into the female screw at one end of the nut 5b, so that the shaft portion 5a and the nut 5b are assembled to each other. However, this is not limited to this, and the nut 5b may be fixed to the tip of the shaft portion 5a.

[0027] The tension member 5 has a base end of a shaft portion 5a inserted into an insertion hole 10a formed in the support plate 10, and is further inserted into through holes 4d, 4e formed in the spherical washer 4. The tension member 5 is disposed with a nut 5b at its tip inserted into the space 3a inside the anti-rotation member 3.

[0028] When the tension member 5 is inserted inside the anti-rotation member 3, as shown in Fig. 2(a), a relatively large gap is formed in the space 3a in the horizontal longitudinal direction of the anti-rotation member 3. In contrast, as shown in Fig. 2(b), the gap formed in the space 3a in the horizontal lateral direction of the anti-rotation member 3 is small, and the outer surface of the nut 5b and the inner surface of the anti-rotation member 3 are close to each other.

[0029] A fuse member 7 is attached to the tip (other end) of the nut 5b. FIG. 3 is a diagram showing the fuse member 7. The fuse member 7 has a male screw portion 21 at one end and a male screw portion 22 at the other end. The fuse member 7 also has a fracture portion 23 with a reduced diameter in the center between the male screw portions 21, 22. The fracture portion 23 is designed to fracture when a tensile force F of a predetermined value or more is applied to the male screw portions 21, 22 in the axial direction as shown in FIG. 3. For example, the tensile force F at which the fuse member 7 fractures can be adjusted by changing the diameter of the fracture portion 23. For example, the male screw portion 22 of the fuse member 7 is attached to the nut 5b.

[0030] The tightening nut 8 is attached to the end of the shaft portion 5a protruding downward from the spherical washer 4 via a washer.

[0031] The anchor testing device 1 having the above configuration has a simpler structure and is lighter than conventional anchor testing devices. Therefore, it can be easily attached to a deck plate even when working at high altitudes.

[0032] Next, the anchor 30 to be subjected to the strength test will be described. FIGS. 4(a) and (b) each show an example of a different type of anchor 30. The anchor 30 shown in FIG. 4(a) is embedded and fixed in a mounting hole H formed in a skeleton 110, and a long nut 31 protrudes from the surface of the skeleton 110. The mounting hole H is formed by penetrating a deck plate 100 provided on the surface of the skeleton 110. The anchor 30 has the long nut 31, a shaft portion 32 inserted into the mounting hole H, an expansion sleeve 33 arranged to cover the outer circumferential surface of the shaft portion 32, and a cone nut 34 attached to the tip of the shaft portion 32. The anchor 30 is fixed to the skeleton 110 by inserting the cone nut 34 into the inside of the expansion sleeve 33 inside the mounting hole H, thereby expanding the tip of the expansion sleeve 33 and engaging it with the inner circumferential wall of the mounting hole H.

[0033] The anchor 30 shown in FIG. 4(b) is embedded and fixed in a mounting hole H formed in the body 110, and a shaft portion 35 having a male screw formed therein protrudes from the surface of the body 110. The anchor 30 has a shaft portion 32, a nut 36 attached to the end of the shaft portion 32, an expansion sleeve 33, and a cone nut 34. As with the above, the anchor 30 is fixed to the body 110 by inserting the cone nut 34 into the inside of the expansion sleeve 33 inside the mounting hole H, expanding the tip of the expansion sleeve 33 and engaging it with the inner peripheral wall of the mounting hole H. The anchor 30 is fixed to the body 110 by tightening the nut 36 to the shaft portion 32 with sufficient strength, and the end 32a (shaft portion 35) of the shaft portion 32 protrudes from the surface of the deck plate.

[0034] For example, when conducting a strength test of the anchor 30 shown in Fig. 4(a), the male thread portion 21 of the fuse member 7 is attached to the long nut 31. When conducting a strength test of the anchor 30 shown in Fig. 4(b), a long nut is attached to the shaft portion 35, and the male thread portion 21 of the fuse member 7 is attached to the long nut.

[0035] FIG. 5 is a diagram showing a state in which the anchor test device 1 is attached to the anchor 30. Note that FIG. 5 shows a state in which the male screw portion 21 of the fuse member 7 is attached to the long nut 31 of the anchor 30 shown in FIG. 4(a). When attaching the anchor test device 1 as shown in FIG. 5, first, the tips of the legs 11, 11 are joined to the surface of the deck plate 100. Since magnets 9, 9 are provided at the tips of the legs 11, 11, when the legs 11, 11 are joined to the deck plate 100, the anchor test device 1 is magnetically attached to the surface of the deck plate 100 by the magnets 9, 9. Therefore, even if the worker releases both hands from the anchor test device 1, the anchor test device 1 will not fall from the deck plate 100. Therefore, the worker can attach the male screw portion 21 of the fuse member 7 to the long nut 31 of the anchor 30 while keeping both hands free. After attaching the fuse member 7 to the long nut 31 of the anchor 30, the worker attaches a socket 39 attached to a power tool such as an impact driver to the tightening nut 8. In this case, too, the worker can attach the socket 39 to the clamping nut 8 while keeping both hands free.

[0036] 6 to 8 are diagrams showing an example of an anchor strength test using the anchor testing device 1. After the socket 39 is attached to the clamping nut 8, first, as shown in FIG. 6, the power tool is operated to rotate the socket 39 in the clamping direction (R2 direction). This causes the clamping nut 8 to rotate in the clamping direction, and an axial tensile force F is applied to the shaft portion 5a of the tensioning member 5. At this time, the outer peripheral surface of the nut 5b of the tensioning member 5 comes into contact with the inner surface of the rotation prevention member 3, so that the rotation of the nut 5b is restricted. Therefore, even if the clamping nut 8 rotates in the clamping direction, the tensioning member 5 does not rotate together with the clamping nut 8, and only the axial tensile force F is applied to the nut 5b.

[0037] If the fixing strength of the anchor 30 embedded in the frame 110 is sufficient, the anchor 30 will not come out of the mounting hole H even if a tensile force F acts on the shaft portion 5a. Therefore, the tensile force F is transmitted to the breaking portion 23 of the fuse member 7 via the shaft portion 5a and the nut 5b. When the tensile force F reaches or exceeds a predetermined value, the breaking portion 23 of the fuse member 7 breaks, as shown in Fig. 7. This shows that the anchor 30 is fixed to the frame 110 with sufficient strength.

[0038] In contrast, if the fixing strength of the anchor 30 embedded in the body 110 is insufficient, as shown in Fig. 8, when a tensile force F acts on the shaft portion 5a, the anchor 30 comes out of the mounting hole H. This shows that the fixing strength of the anchor 30 is insufficient.

[0039] In this way, the anchor testing device 1 of this embodiment can test the strength of the anchor 30 simply by visually confirming whether the breaking portion 23 breaks or the anchor 30 comes out of the mounting hole H when the clamping nut 8 is tightened using a power tool.

[0040] Incidentally, the mounting hole H formed in the skeleton 110 may not be formed as a hole perpendicular to the surface of the skeleton 110, but may be slightly tilted. In such a case, when performing an anchor strength test, it is necessary to apply a tensile force F along the tilted axial direction of the anchor 30. The anchor testing device 1 of this embodiment can appropriately perform a strength test even when the anchor 30 is embedded in the skeleton 110 at a slight incline.

[0041] FIG. 9 is a diagram showing an example of an anchor strength test when the shaft of the anchor 30 is inclined. As described above, the tension member 5 forms a relatively large gap in the horizontal longitudinal direction inside the rotation prevention member 3. That is, as shown in FIG. 9, the gap between the nut 5b and the inner wall of the rotation prevention member 3 is large. Therefore, the rotation prevention member 3 allows the nut 5b (tensile member 5) to be inclined in the horizontal longitudinal direction (long side direction). This allows the tension member 5 to be arranged in a state inclined coaxially with the shaft of the anchor 30 inside the rotation prevention member 3. In addition, since the tightening nut 8 attached to the base end of the shaft 5a is attached to the lower surface of the support plate 10 via the spherical washer 4, the base end of the shaft 5a can be arranged in a state inclined coaxially with the shaft of the anchor 30 by changing the relative position of the concave member 4a and the convex member 4b of the spherical washer 4. As a result, it is possible to arrange the anchor 30, the fuse member 7, and the tension member 5 on the same axis as each other, as shown in FIG. 9. By attaching a socket 39 to the tightening nut 8 and rotating the tightening nut 8 in the tightening direction, it is possible to apply the tensile force F appropriately in the axial direction of the anchor 30, and a strength test can be performed appropriately.

[0042] FIG. 10 is a diagram showing another example of performing an anchor strength test when the shaft of the anchor 30 is inclined. As described above, the rotation prevention member 3 is attached to the multiple legs 11, 11 so as to be able to swing. Therefore, by swinging the rotation prevention member 3 relative to the multiple legs 11, 11 to set the angle posture according to the inclination of the anchor 30, the inclination of the nut 5b (the tension member 5) is permitted in the horizontal short side direction (short side direction). In addition, by changing the relative posture of the concave member 4a and the convex member 4b of the spherical washer 4, the base end of the shaft 5a can be arranged in a state inclined coaxially with the shaft of the anchor 30. As a result, as shown in FIG. 10, it is possible to arrange the anchor 30, the fuse member 7, and the tension member 5 all on the same axis. Then, by attaching a socket 39 to the tightening nut 8 and rotating the tightening nut 8 in the tightening direction, it is possible to appropriately apply the tensile force F to the axial direction of the anchor 30, and the strength test can be appropriately performed.

[0043] In this way, the anchor testing device 1 can apply the tensile force F in the same axial direction as the anchor 30 even if the anchor 30 is inclined in either the front-rear direction or the left-right direction. For example, when the deck plate 100 is a corrugated plate in which peaks and valleys are alternately continuous, the post-installed anchor is attached to the peaks of the deck plate 100. In this case, the anchor 30 may be attached in a position close to the wall of the deck plate 100, and the position where the legs 11, 11 of the anchor testing device 1 are installed may be restricted. However, the anchor testing device 1 of this embodiment can apply the tensile force F in the same axial direction as the anchor 30 even if the anchor 30 is inclined in either the front-rear direction or the left-right direction, so that if the legs 11, 11 can be magnetically attached to the peaks of the deck plate 100, a strength test of the anchor 30 can be appropriately performed.

[0044] As described above, the anchor testing device 1 of this embodiment is configured so that the fuse member 7 attached to the nut 5b of the tension member 5 is attached to the anchor 30, and the clamping nut 8 is tightened to apply a tensile force F to the anchor 30 via the fuse member 7. The fuse member 7 has a breaking portion 23 that breaks when a tensile force F of a predetermined value or more is applied to it in the axial direction, so that a strength test of the anchor 30 can be performed by checking whether or not the breaking portion 23 breaks when the clamping nut 8 is tightened.

[0045] In addition, since the tightening nut 8 of the anchor test device 1 can be rotated in the tightening direction using a power tool, it is possible to obtain test results in about 1 to 3 seconds after operating the power tool, which is excellent in work efficiency. In addition, since the anchor test device 1 does not require a separate display or the like as in the past, it is possible to efficiently perform strength tests even when working at high altitudes with a narrow work space. Therefore, the anchor test device 1 can be suitably used for strength tests of anchors 30 embedded in the skeleton 110 on the deck plate 100.

[0046] The anchor testing device 1 of this embodiment also includes a rotation prevention member 3 that contacts the outer peripheral surface of the nut 5b of the tension member 5 to prevent the rotation of the nut 5b. If a rotation force other than the tensile force F acts on the breaking portion 23 of the fuse member 7, the breaking portion 23 may break even when the tensile force F is not equal to or greater than a predetermined value, and the strength test of the anchor 30 cannot be performed appropriately. The rotation prevention member 3 has a function of preventing the rotation of the fuse member 7 by preventing the rotation of the nut 5b, and preventing the breaking portion 23 from breaking when the tensile force F is not equal to or greater than a predetermined value. The rotation prevention member 3 also has a function of preventing the rotation of the anchor 30. These functions of the rotation prevention member 3 allow the anchor testing device 1 to perform the strength test of the anchor 30 appropriately.

[0047] Although the preferred embodiments of the present invention have been described above, the present invention is not limited to those described in the above embodiments. In other words, the present invention includes those in which various modifications are applied to the above-described embodiments.

[0048] FIG. 11 is a diagram showing a modified example of the anchor testing device 1. The anchor testing device 1 shown in FIG. 11 has a retaining member 18 attached to the shaft portion 5a of the tension member 5. The retaining member 18 is formed, for example, by a nut having a diameter larger than the insertion hole 10a formed in the support plate 10. The retaining member 18 is attached to the shaft portion 5a, for example, between the rotation prevention member 3 and the support plate 10. Therefore, for example, when an operator releases his / her hand from the anchor testing device 1 or when the breaking portion 23 breaks during a strength test of the anchor 30, the retaining member 18 engages with the support plate 10 even if the tension member 5 tries to fall, and therefore the tension member 5 can be prevented from falling out of the insertion hole 10a.

[0049] Next, in the above embodiment, an example has been described in which the anchor testing device 1 tests the anchors 30 embedded in the frame 110 formed on the deck plate 100 of a ceiling. However, the anchors 30 to which the above-mentioned anchor testing device 1 can be applied are not limited to the anchors 30 embedded in the frame 110 formed on the deck plate 100 of a ceiling. In other words, the above-mentioned anchor testing device 1 can also be used when conducting a strength test of the anchors 30 embedded in a wall surface or a floor surface.

[0050] In the above embodiment, the anchor 30 to be subjected to the strength test is illustrated in Fig. 4. However, the configuration of the anchor 30 to be subjected to the strength test is not limited to that shown in Fig. 4. In other words, the anchor testing device 1 explained in the above embodiment can be applied to an anchor having a different configuration from the anchor 30 shown in Fig. 4. [Explanation of symbols]

[0051] 1...anchor testing device, 2...base, 3...anti-rotation member, 4...spherical washer, 5...tensile member, 5a...shaft portion, 5b...nut, 7...fuse member, 8...clamping nut, 9...magnet, 18...anti-pullout member, 30...anchor.

Claims

1. An anchor testing device for performing a pull-out test on an anchor embedded in a building structure, A base having a support plate supported by a plurality of legs at a position a predetermined distance from the surface of the body; A tension member that is inserted into an insertion hole formed in the support plate; a fuse member provided at a tip of the tension member and having a breaking portion that breaks when a tension force equal to or greater than a predetermined value is applied in the axial direction; a tightening nut attached to a rear end of the tension member protruding to the outside of the base through the insertion hole formed in the support plate; Equipped with An anchor testing device, characterized in that when the clamping nut is tightened with the fuse member attached to the anchor, the tension member applies a tensile force to the anchor via the fuse member.

2. a rotation prevention member between the plurality of legs that contacts an outer peripheral surface of the tension member to prevent rotation of the tension member; 2. The anchor testing apparatus of claim 1, further comprising:

3. 3. The anchor testing device according to claim 2, wherein the anti-rotation member is a cylindrical body having rectangular openings at the top and bottom, and allows the tension member to tilt in the direction of the long side of the rectangle.

4. 3. The anchor testing device according to claim 2, wherein the anti-rotation member is attached to the plurality of legs so as to be able to swing and assume an angular position corresponding to the inclination of the tension member.

5. 4. The anchor testing device according to claim 3, wherein the anti-rotation member is attached to the plurality of legs so as to be able to swing and assume an angular position corresponding to the inclination of the tension member.

6. a spherical washer provided between the support plate and the clamping nut; 6. The anchor testing device according to claim 1, further comprising:

7. A magnet provided at the tip of the leg; 6. The anchor testing device according to claim 1, further comprising:

8. A magnet provided at the tip of the leg; 7. The anchor testing apparatus of claim 6, further comprising:

9. 6. The anchor testing device according to claim 1, wherein the shaft portion is provided with a retaining member for preventing the breaking portion from coming out of the insertion hole when the breaking portion breaks.

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