JP2017002575A - Anchor, anchor construction tool and anchor construction method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an anchor that is improved in work efficiency when constructed, and thereby suppress the increase of construction cost.SOLUTION: An anchor 1 includes a first screw part 3 formed in one end side of a shaft part 2, a second screw part 4 formed in the other end side of the shaft part 2, an engagement part 6 formed in the end of the second screw part 4 and protruded or recessed more narrowly than the diameter of the second screw part 4, and a nut 7 pre-installed to the second screw part 4. The anchor 1 is characterized in that the shaft part 2 and the nut 7 are integrally rotated and the first screw part 3 is screwed into a hole according to that an anchor construction tool 10 is rotated while the anchor construction tool 10 is engaged with both of the engagement part 6 and the nut 7, the engagement part 6 is disengaged from an engagement state with the anchor construction tool 10 when the first screw part 3 is screwed to the hole by a predetermined depth, and the nut 7 is rotated while the shaft part 2 is not rotated, and thereby is constructed in a state where the end surface of the nut 7 is joined and secured in a slab surface.SELECTED DRAWING: Figure 3

Description

  The present invention relates to an anchor, an anchor application tool, and an anchor installation method, and more particularly to a technique capable of suitably installing an anchor on a ceiling slab.

  Conventionally, as a post-installation type anchor that can be attached to a ceiling slab or the like, there is an anchor as disclosed in Patent Document 1, for example. This conventional anchor inserts the tip of a shaft part with a cone nut and an expansion sleeve attached into a hole provided on the surface of a slab such as a ceiling slab, and rotates the head provided on the shaft part to thereby rotate the cone nut. The expansion sleeve is expanded by allowing the expansion sleeve to enter the inside of the expansion sleeve, and the expanded expansion sleeve is engaged with the inner wall of the hole. The head of this conventional anchor is provided with a breaking groove, and if the torque when rotating the head exceeds a predetermined value, the breaking groove breaks, so the expansion sleeve is firmly fixed to the inner wall of the hole This state can be grasped by breaking the breaking groove. Therefore, this conventional anchor can be attached to the hole formed on the slab surface with a stable strength and has an advantage that it is easy to construct.

  In addition to the above, as an anchor that can be post-installed in a hole provided on the surface of the slab, for example, there is a screw-in type anchor disclosed in Patent Document 2. This conventional anchor has a first screw portion on one end side of the shaft portion and a second screw portion on the other end side, and is provided on one end side with respect to a hole formed on the slab surface. By screwing the first screw part, it is attached to the slab surface.

JP 2012-177290 A JP 2007-30120 A

  By the way, although the conventional anchor described in the said patent document 1 has the advantage that attachment with the stable intensity | strength is possible and it is easy to construct, since there are many parts, there exists a problem that cost becomes high. .

  On the other hand, the conventional anchor described in Patent Document 2 has a configuration in which the first screw portion is provided on one end side of the shaft portion and the second screw portion is provided on the other end side. There is an advantage that the cost is reduced.

  However, the conventional anchor described in Patent Literature 2 is not suitable for construction on a ceiling slab. This is because a screw-in type anchor can only be screwed into a hole formed on the surface of the slab and fixed, and cannot be attached to the hole with sufficient strength. Therefore, if a screw-in type anchor is screwed into a hole formed in a ceiling slab and used, for example, the screwed-in part may be loosened and an anchor may be detached from the hole.

  In order to prevent the screw-type anchor from being removed from the hole, for example, after screwing the first screw part of the screw-type anchor into the hole, the nut is attached to the second screw part that protrudes from the slab surface. It is necessary to attach the nut firmly to the slab surface. However, in that case, the operator must perform the work of screwing the screw-in type anchor into the hole, attaching the nut to the second screw portion, and tightening the nut with a spanner or the like. Efficiency is significantly reduced. In particular, when construction is performed on a ceiling slab, it is difficult to perform these operations from the floor surface, and thus it is necessary to assemble a scaffold or perform a work at a high place using a lifting lift. Therefore, although the screw-in type anchor itself is inexpensive, there is a problem that the construction cost increases.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an anchor, an anchor application tool, and an anchor construction method that are excellent in workability and that can suppress an increase in construction cost in order to solve the above conventional problems. .

  In order to achieve the above object, the invention according to claim 1 is an anchor (1, 1a) in which a plurality of screw threads (3a, 3b) having different heights are formed on one end side of the shaft portion (2). The first screw portion (3), the second screw portion (4) formed on the other end side of the shaft portion (2), and the second screw portion on the other end side of the shaft portion (2). An engagement portion (6) formed at an end of the portion (4) and protruding or recessed narrower than the diameter of the second screw portion (4); and the second screw portion (4) And a nut (7, 8) to be mounted in advance.

  According to a second aspect of the present invention, in the anchor (1, 1a) according to the first aspect, the anchoring tool (10, 30) is provided on both the engaging portion (6) and the nut (7, 8). As the anchoring tool (10, 30) is rotated in the engaged state, the shaft (2) and the nut (7, 8) rotate integrally, and the shaft (2) The first screw part (3) formed on one end side of the slab is screwed into a hole formed on the surface of the slab, and the first screw part (3) is screwed into the hole to a predetermined depth. As the engaging portion (6) is disengaged from the anchor tool (10, 30) and the anchor tool (10, 30) is further rotated, the shaft portion (2) is The nut (7, 8) rotates in a state where it does not rotate and advances through the second screw portion (4) toward the slab surface, and the end surface of the nut (7, 8) is joined to the slab surface It is the structure characterized by being constructed in

  The invention according to claim 3 is a first screw portion (3) formed on one end side of the shaft portion (2) and a second screw portion (4) formed on the other end side of the shaft portion (2). An engaging portion (6) projecting or recessed narrower than the diameter of the second screw portion (4) at the other end of the shaft portion (2), and the second screw An anchoring tool (10, 30) for installing an anchor (1, 1a) having a nut (7, 8) attached in advance to a part (4) by screwing it into a hole formed in the slab surface, A mounting hole into which the second screw part (4) to which the nut (7, 8) is attached can be inserted in a state where the first screw part (3) of the anchor (1, 1a) protrudes on one end side. (12) has a tool body formed with an engagement hole (18) that can be mounted in a state where the tip of the rotary tool is engaged on the other end, and the bottom of the mounting hole (12) Formed with a first engaging portion (14, 19) that engages with the engaging portion (6) provided on the anchor (1, 1a). The inner wall of the mounting hole (12), a structure, wherein a second engaging portion that engages with the side surface of the nut (7, 8) (15) is formed.

  The invention according to claim 4 is the first screw part (3) formed on one end side of the shaft part (2) and the second screw part (4) formed on the other end side of the shaft part (3). An engaging portion (6) projecting or recessed narrower than the diameter of the second screw portion (4) at the other end of the shaft portion (2), and the second screw The anchor (1, 1a) having a nut (7, 8) attached in advance to the part (4) is an anchor construction method in which the anchor (1, 1a) is screwed into a hole formed on the surface of the slab. The mounting hole (12) of the anchoring tool (10, 30) formed with a mounting hole (12) into which the second screw part (4) to which the nut (7, 8) of 1a) is mounted can be inserted. The anchor (1,1a) is inserted into the first engagement portion formed at the bottom of the mounting hole (12) with the first screw portion (3) of the anchor (1,1a) protruding. The portion (14, 19) is engaged with the engagement portion (6) provided in the anchor (1, 1a), and the mounting hole (12) Engaging the second engaging portion (15) formed on the inner wall of the nut (7, 8) with the side surface of the nut (7, 8), and the first engaging portion (14, 19) being the anchor (1, The anchor applying tool is engaged with the engaging portion (6) provided in 1a) and the second engaging portion (15) is engaged with a side surface of the nut (7, 8). By rotating (10, 30), the shaft (2) and the nut (7, 8) are rotated so that the first screw portion (3) of the anchor (1, 1a) is inserted into the hole. Screwing into the mounting hole (12), the step of bringing the peripheral edge tip of the mounting hole (12) into contact with the surface of the slab; and the peripheral edge tip of the mounting hole (12) contacting the surface of the slab; The portion (14, 19) engages with the engagement portion (6) provided on the anchor (1, 1a), and the second engagement portion (15) is engaged with the nut (7, 8). By rotating the anchoring tool (10, 30) while being engaged with the side surface of the shaft portion (2), The nut (7, 8) is rotated and the first screw portion (3) of the anchor (1, 1a) is further screwed into the hole, so that the first engaging portion (14, 19) Detaching from the engaging portion (6) provided on the anchor (1, 1a), and the first engaging portion (14, 19) provided on the anchor (1, 1a). After detaching from the engaging portion (6), the anchoring tool (10, 30) is further rotated in a state where the second engaging portion (15) is engaged with the side surface of the nut (7, 8). The nut (7, 8) is rotated and advanced along the second screw portion (4) to fasten and fix the end of the nut (7, 8) to the slab surface; It is the structure characterized by having.

  According to the present invention, the process of screwing the anchor into the hole and the process of tightening the nut can be performed in a single operation, so that the workability is excellent and the increase in construction cost can be suppressed.

It is a figure which shows the anchor in 1st Embodiment. It is a figure which shows an example of the anchoring tool used when constructing | assembling the anchor of 1st Embodiment. It is sectional drawing which shows the state which mounted | wore the anchor to the anchoring tool of 1st Embodiment. It is a figure which shows the 1st procedure of the anchor construction method in 1st Embodiment. It is a figure which shows the 2nd procedure of the anchor construction method in 1st Embodiment. It is a figure which shows the 3rd procedure of the anchor construction method in 1st Embodiment. It is a figure which shows the 4th procedure of the anchor construction method in 1st Embodiment. It is a figure which shows the 5th procedure of the anchor construction method in 1st Embodiment. It is a figure which shows the 6th procedure of the anchor construction method in 1st Embodiment. It is a figure which shows the anchor in 2nd Embodiment. It is a figure which shows an example of the anchor tool used when constructing the anchor of 2nd Embodiment. It is a figure which shows the 1st procedure of the anchor construction method in 2nd Embodiment. It is a figure which shows the 2nd procedure of the anchor construction method in 2nd Embodiment. It is a figure which shows the 3rd procedure of the anchor construction method in 2nd Embodiment. It is a figure which shows the 4th procedure of the anchor construction method in 2nd Embodiment. It is a figure which shows the 5th procedure of the anchor construction method in 2nd Embodiment.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. In addition, in each drawing referred to below, the same code | symbol is attached | subjected to the mutually common member, and the overlapping description about them is abbreviate | omitted.

(First embodiment)
1A and 1B are views showing an anchor 1 according to a first embodiment of the present invention. FIG. 1A is an external view thereof, and FIG. 1B is a longitudinal sectional view thereof. This anchor 1 is constructed by screwing into a hole formed in a slab surface such as a ceiling slab. The anchor 1 includes a shaft portion 2 configured in a rod shape with a metal such as iron or stainless steel, and a metal nut 7 attached to the shaft portion 2.

  The shaft portion 2 includes a first screw portion 3 in which two large and small screw threads 3a and 3b having different heights are alternately formed on one end 2a side, and a general metric screw male screw 4a on the other end 2b side. It has the formed 2nd screw part 4, and the engaging part 6 comprised by the recessed part 5 formed in the end surface by the side of the other end 2b of the 2nd screw part 4. As shown in FIG. The concave portion 5 formed as the engaging portion 6 is formed to be narrower than the second screw portion 4, and the inner peripheral wall thereof has a square or hexagonal shape. In the present embodiment, the case where the concave portion 5 is provided in a hexagonal shape is illustrated. The male screw 4a formed on the second screw part 4 is a metric screw, so that the angle of the screw thread is 60 degrees, whereas the angle of the two screw threads 3a and 3b formed on the first screw part 3 is as follows. Are both larger than the angle of the thread of the metric screw and are formed at an angle exceeding 60 degrees.

  The nut 7 is configured as a hexagonal nut, for example, and has a female screw 7a of a metric screw formed at the axial center thereof, and has a predetermined length in the axial direction. The nut 7 is configured as a long nut whose axial length is longer than that of a general nut, and is a nut longer than the second screw portion 4 formed on the shaft portion 2. For example, the second screw portion 4 times as long as 4. The nut 7 is attached to the second screw portion 4 in advance so that, for example, the upper end thereof is located between the upper end and the center of the second screw portion 4. FIG. 1B illustrates a case where the nut 7 is mounted so that the upper end of the nut 7 is located approximately at the center of the second screw portion 4. As a result, the engaging portion 6 formed at the end 2b of the shaft portion 2 is positioned inside the nut 7 attached to the second screw portion 4 as shown in FIG.

  FIG. 2 is a view showing an example of an anchoring tool 10 used when constructing the anchor 1, FIG. 2 (a) is an external perspective view thereof, and FIG. 2 (b) is a longitudinal sectional view thereof. ing. The anchor application tool 10 is configured in a substantially cylindrical shape and has a predetermined length in the axial direction. A mounting hole 12 for inserting and mounting the anchor 1 is formed in the upper end surface 11 of the anchoring tool 10, and the lower end surface 17 is engaged with the tip of a rotary tool such as an electric type. An attachable engagement hole 18 is formed. The mounting hole 12 is a circular hole 16 having an upper portion with a predetermined radius, and the lower portion is configured as a hexagonal hole 15 that matches the outer shape of the nut 7 mounted on the anchor 1. A hexagonal columnar engaging protrusion 14 is formed at the center of the bottom of the hexagonal hole 15 so as to protrude toward the upper end surface 11. The engaging protrusion 14 and the hexagonal hole 15 are engaging portions 13 provided for engaging with the anchor 1. That is, the engagement protrusion 14 is configured as a first engagement portion that engages with the engagement portion 6 formed by the recess 5 formed on the end surface of the anchor 1 on the other end 2b side, The second engaging portion is configured to engage with the side surface of the nut 7 of the anchor 1. Moreover, the engagement hole 18 formed in the lower end surface 17 of the anchoring tool 10 is configured as a hexagonal hole, for example, and a hexagonal columnar tool tip is inserted to engage with the rotary tool.

  As shown in FIG. 2, the mounting hole 12 has a depth H1 from the upper end surface 11 of the anchoring tool 10, and a hexagonal hole 15 having a depth H2 is formed at the bottom thereof. Further, the engaging protrusion 14 has a height H3 from the bottom of the mounting hole 12. Here, the relationship between H1, H2, and H3 is, for example, H1> H2> H3. That is, the depth H2 of the hexagonal hole 15 formed at the bottom of the mounting hole 12 is formed to be greater than the height H3 of the engagement protrusion 14. The depth of the engagement hole 18 that engages with the rotary tool is H4. And in this embodiment, the length (H1-H3) from the upper end surface 11 of the anchoring tool 10 to the tip of the engaging projection 14 is the length of the second screw portion 4 formed on the shaft portion 2 of the anchor 1. They are formed to have approximately the same length.

  FIG. 3 is a cross-sectional view showing a state in which the anchor 1 is mounted on the anchoring tool 10. When constructing the anchor 1, the worker attaches the anchor 1 to the anchoring tool 10 as shown in FIG. 3. That is, the operator attaches the anchor 1 to the anchor application tool 10 by inserting the nut 7 portion of the anchor 1 into the attachment hole 12 of the anchor application tool 10. At this time, the side surface of the nut 7 is engaged with the hexagonal hole 15 of the anchoring tool 10, and the engagement protrusion 14 of the anchoring tool 10 is formed as a hexagonal hole at the other end 2 b of the shaft portion 2 of the anchor 1. 5 is engaged with the inserted state. 3 exemplifies the case where the lower end of the nut 7 is in contact with the bottom of the mounting hole 12, the present invention is not limited to this, and the tip 14 a of the engagement protrusion 14 is the recess 5 of the anchor 1. The bottom end of the nut 7 may be in a state of floating from the bottom of the mounting hole 12 when being inserted into the nut. Then, the operator attaches the washer 20 to the shaft portion 2 from the upper end of the anchor 1 as shown in FIG. For example, the washer 20 is placed on the upper end surface of the nut 7.

  Next, a procedure for constructing the anchor 1 in the hole 102 formed in the surface 101 of the ceiling slab 100 will be described with reference to FIGS. 4 to 9. First, the operator inserts and attaches the tip of the rotary shaft 103 of the rotary tool to the engagement hole 18 formed in the lower end surface 17 of the anchoring tool 10 to which the anchor 1 is attached as shown in FIG. Here, by using a long shaft of about several meters as the rotating shaft 103, for example, the operator can perform the construction work while staying on the floor surface, and the work efficiency is good. Then, the operator joins the tip 2a of the anchor 1 to the hole 102 formed in the surface 101 of the ceiling slab 100 with the rotary shaft 103 set on the anchor application tool 10, and drives the rotary tool. Thereby, as shown in FIG. 5, since the rotating shaft 103 rotates clockwise (R direction), the anchoring tool 10 rotates with it.

  Since the anchor 1 is engaged with the engagement protrusion 14 of the anchor tool 10 in the recess 5 formed at the lower end of the shaft part 2, the shaft part 2 is rotated with the rotation of the anchor tool 10. Thereby, the 1st screw part 3 formed in the axial part 2 of the anchor 1 is screwed with respect to the hole 102, as shown in FIG. At this time, of the two large and small screw threads 3 a and 3 b of the first screw part 3, the large screw thread 3 a advances toward the inner part of the hole 102 while cutting the inner wall of the hole 102, and the small screw thread 3 b passes through the hole 102. The guide function that prevents shaft runout and the like while in contact with the inner wall. Further, since a slight gap is formed between the inner wall of the hole 102 between the large screw thread 3a and the small screw thread 3b, the scraps scraped by the large screw thread 3a can be accommodated in the gap. Moreover, the anchor 1 can be more firmly fixed by applying pressure due to the screwing of the anchor 1 to the shavings in the gap.

  Further, since the nut 7 attached to the second screw portion 4 of the anchor 1 is also engaged with the hexagonal hole 15 of the anchoring tool 10, the shaft portion 2 is integrated with the shaft portion 2 as the shaft portion 2 rotates. Rotate. That is, at this stage, the relative positional relationship between the shaft portion 2 and the nut 7 in the anchor 1 does not change. As the first screw portion 3 of the anchor 1 is screwed into the hole 102, the anchor application tool 10 gradually brings its upper end portion closer to the surface 101 of the ceiling slab 100.

  Then, even after the upper end portion 10a of the anchoring tool 10 comes into contact with the surface 101 of the ceiling slab 100 as shown in FIG. 6, the operator continues to drive the rotary tool. Thereby, since the rotating shaft 103 continues to rotate clockwise, the shaft portion 2 and the nut 7 continue to rotate. As a result, the first screw portion 3 formed in the shaft portion 2 is screwed deeper into the hole 102. At this time, since the upper end portion 10 a of the anchoring tool 10 is in contact with the surface 101 of the ceiling slab 100, the anchoring tool 10 is fixed in the axial direction of the hole 102. Therefore, when the first screw portion 3 is further screwed deeply by the rotation of the anchor application tool 10, the anchor 1 advances toward the back of the hole 102 inside the anchor application tool 10.

  When almost the entire first screw portion 3 is screwed into the hole 102 and the second screw portion 4 protrudes from the surface of the hole 102, the engagement protrusion 14 of the anchoring tool 10 is moved as shown in FIG. Detach from the recess 5 formed in the shaft 2 of the anchor 1. As a result, the rotational force due to the rotation of the rotating shaft 103 is not transmitted to the shaft portion 2, so that the shaft portion 2 is fixed in a state of being screwed into the hole 102. On the other hand, even after the shaft portion 2 is fixed, the rotational force generated by the rotation of the anchoring tool 10 is still transmitted to the nut 7 engaged with the hexagonal hole 15. Therefore, even after the tip of the engagement protrusion 14 is detached from the recess 5 of the shaft portion 2 and the shaft portion 2 stops rotating, the nut 7 rotates together with the anchoring tool 10, and the nut 7 rotates to the second screw portion 4. Ascend along.

  When the nut 7 rises along the second screw part 4 and hits the surface 101 of the ceiling slab 100 with the washer 20 sandwiched as shown in FIG. 8, the torque for rotating the anchoring tool 10 rises rapidly. When the rotational torque exceeds a predetermined value, the nut 7 is firmly tightened against the surface 101 of the ceiling slab 100, so that the anchor 1 is attached more firmly and the anchor 1 is well attached to the ceiling slab 100. It becomes. When the anchoring tool 10 is pulled out downward, the anchor 1 is installed on the ceiling slab 100 as shown in FIG. As described above, the anchor 1 of the present embodiment is formed such that the angle of the large screw thread 3a formed in the first screw part 3 of the shaft part 2 is larger than the angle of the screw thread of the metric screw and exceeds 60 degrees. Therefore, in the state where the construction is completed as shown in FIG. 9, the area of the screw thread 3a scraped from the ceiling slab 100 can be made larger than that of a general metric screw. The contact area with the slab 100 is increased, and the anchor 1 is prevented from coming off due to increased frictional force. In addition, since the nut 7 previously attached to the second screw portion 4 is fastened and firmly fixed in a state where it is joined to the surface 101 of the ceiling slab 100, the fastening strength of the anchor 1 is further increased by tightening the nut 7. Further increase. Therefore, even if a large-scale earthquake occurs, it is possible to satisfactorily prevent the portion where the anchor 1 is screwed from being loosened, and to prevent the anchor 1 from being detached from the hole 102 in advance. It is.

  As shown in FIG. 9, after the installation of the anchor 1 is completed, the suspension bolt 105 is attached to the female screw portion 7 b of the lower half of the nut 7. And the work which attaches ceiling structures, such as an air conditioner, a ceiling panel frame, and various piping structures, to suspension bolt 105 is performed separately.

  As described above, in this embodiment, when the screw-type anchor 1 is constructed, the anchor 7 is used in the state in which the nut 7 is attached in advance to the second screw portion 4 of the anchor 1 by using the anchoring tool 10 described above. 1 can be applied to the hole 102. That is, the anchor 1 with the nut 7 attached is inserted into the mounting hole 12 of the anchoring tool 10 as it is, and the rotary tool 103 is engaged with the engagement hole 18 of the anchoring tool 10 to drive the rotating tool. By doing so, the anchor 1 can be applied to the hole 102. At this time, since the operator can perform the construction work while staying on the floor by using a long rotating shaft 103 to be mounted in the engagement hole 18 of the anchoring tool 10, a scaffold is assembled. There is no need to use a lift or a lifting lift, and the work can be carried out efficiently. Further, when the operator drives the rotary tool and installs the anchor 1 in the hole 102, the operator continues the driving of the rotary tool until the torque of the rotary shaft 103 becomes a predetermined value or more, whereby the first screw portion of the anchor 1 is obtained. The process of screwing 3 into the hole 102 and the process of tightening the nut 7 to the state where the nut 7 is joined to the surface 101 of the ceiling slab 100 can be performed simultaneously by a series of operations, and the construction of the anchor 1 is completed efficiently. Therefore, if the anchor 1 and the anchor application tool 10 of the present embodiment are used, the work time is shorter than before and the increase in construction cost can be suppressed.

(Second Embodiment)
FIG. 10 is a view showing an anchor 1a according to the second embodiment of the present invention. FIG. 10 (a) is an external view thereof, and FIG. 10 (b) is a longitudinal sectional view thereof. As in the first embodiment, the anchor 1a is constructed by screwing into a hole formed on the surface of a slab such as a ceiling slab, and is configured as a rod made of metal such as iron or stainless steel. A portion 2 and a metal nut 8 attached to the shaft portion 2 are provided.

  As in the first embodiment, the shaft portion 2 has a first screw portion 3 in which two large and small screw threads 3a and 3b having different heights are alternately formed on the one end 2a side, and a common one on the other end 2b side. And a second screw portion 4 formed with a metric screw male screw 4a. Further, the shaft portion 2 of the present embodiment has an engaging portion 6 constituted by a convex portion 9 formed on the end surface of the second screw portion 4 on the other end 2b side. The convex portion 9 formed as the engaging portion 6 is formed narrower than the second screw portion 4 and protrudes downward in the shape of a square or hexagon. In this embodiment, the case where the convex portion 9 is provided in a hexagonal shape is illustrated. The nut 8 is configured as, for example, a general hex nut. The nut 8 is attached to the second screw portion 4 in advance so as to be located, for example, in the approximate center of the second screw portion 4.

  FIG. 11 is a view showing an example of the anchoring tool 30 used when constructing the anchor 1 a, and shows a state where the anchor 1 a is attached to the anchoring tool 30. The anchor application tool 30 is configured in a substantially cylindrical shape and has a predetermined length in the axial direction. As in the first embodiment, an attachment hole 12 for inserting and attaching the anchor 1a is formed on the upper end surface of the anchoring tool 30, and the tip of a rotary tool such as an electric type is formed on the lower end surface. An engagement hole 18 that can be mounted in the engaged state is formed. The mounting hole 12 is a circular hole having an upper portion with a predetermined radius, and the lower portion is configured as a hexagonal hole 15 that matches the outer shape of the nut 8 attached to the anchor 1a. A concave portion 19 is formed at the center of the bottom of the hexagonal hole 15 to engage with the convex portion 9 formed on the other end 2b side of the anchor 1a. The concave portion 19 is an engaging portion that engages with the convex portion 9 of the anchor 1a.

  When the worker constructs the anchor 1a, the worker attaches the anchor 1a to the anchoring tool 30 as shown in FIG. That is, the operator attaches the anchor 1 a to the anchor application tool 30 by inserting the second screw portion 4 to which the nut 8 of the anchor 1 a is attached into the attachment hole 12 of the anchor application tool 30. At this time, the side surface of the nut 8 is engaged with the hexagonal hole 15 of the anchoring tool 30, and the convex portion 9 formed on the other end 2 b of the shaft portion 2 of the anchor 1 a with respect to the concave portion 19 of the anchoring tool 30. Engage in the inserted state. Then, after attaching the anchor 1a to the anchoring tool 30, the operator further attaches the washer 20 to the shaft portion 2 from the upper end of the anchor 1a as shown in FIG.

  Next, a procedure for constructing the anchor 1a in the hole 102 formed in the surface 101 of the ceiling slab 100 will be described with reference to FIGS. First, the operator inserts and attaches the tip of the rotary shaft 103 of the rotary tool to the engagement hole 18 formed in the lower end surface of the anchoring tool 30 to which the anchor 1a is attached as shown in FIG. As described in the first embodiment, by using a long shaft of about several meters, for example, as the rotating shaft 103, the operator can perform the construction work while staying on the floor, and the work efficiency is improved. good. Then, the operator joins the tip 2a of the anchor 1a to the hole 102 formed in the surface 101 of the ceiling slab 100 with the rotary shaft 103 set on the anchor application tool 30, and drives the rotary tool. Thereby, as shown in FIG. 13, since the rotating shaft 103 rotates in the clockwise direction (R direction), the anchoring tool 10 rotates with it.

  Since the convex portion 9 formed at the lower end of the shaft portion 2 is engaged with the concave portion 19 of the anchor tool 30, the anchor 1 a rotates the shaft portion 2 with the rotation of the anchor tool 30. Thereby, the 1st screw part 3 formed in the axial part 2 of the anchor 1 is screwed with respect to the hole 102, as shown in FIG. In addition, since the nut 8 attached to the second screw portion 4 of the anchor 1a is also engaged with the hexagonal hole 15 of the anchoring tool 30, the shaft portion 2 is integrated with the shaft portion 2 as the shaft portion 2 rotates. Rotate. That is, at this stage, the relative positional relationship between the shaft portion 2 and the nut 8 in the anchor 1a does not change. As the first screw portion 3 of the anchor 1 a is screwed into the hole 102, the anchor application tool 30 gradually brings its upper end portion closer to the surface 101 of the ceiling slab 100.

  Then, even after the upper end portion of the anchoring tool 30 comes into contact with the surface 101 of the ceiling slab 100 as shown in FIG. 13, the operator continues to drive the rotary tool. Thereby, since the rotating shaft 103 continues to rotate clockwise, the shaft portion 2 and the nut 7 continue to rotate. As a result, the first screw portion 3 formed in the shaft portion 2 is screwed deeper into the hole 102. At this time, since the upper end portion of the anchoring tool 30 is in contact with the surface 101 of the ceiling slab 100, the anchoring tool 30 is fixed with respect to the axial direction of the hole 102. Therefore, when the first screw part 3 is screwed further deeply by the rotation of the anchor application tool 30, the anchor 1 a rises inside the anchor application tool 30 toward the inner part of the hole 102.

  Then, when almost the entire first screw portion 3 is screwed into the hole 102 and the second screw portion 4 protrudes from the surface of the hole 102, the convex portion 9 of the anchor 1a becomes the anchor tool as shown in FIG. Detach from the 30 recesses 19. As a result, the rotational force of the rotating shaft 103 is not transmitted to the shaft portion 2, so that the shaft portion 2 is fixed in a state where it is screwed into the hole 102. On the other hand, even after the shaft portion 2 is fixed, the rotational force generated by the rotation of the anchoring tool 30 is still transmitted to the nut 8 engaged with the hexagonal hole 15. Therefore, even after the convex portion 9 is detached from the concave portion 19 and the shaft portion 2 does not rotate, the nut 8 rotates with the anchoring tool 30, and the nut 8 rises along the second screw portion 4.

  When the nut 8 rises along the second screw portion 4 and hits the surface 101 of the ceiling slab 100 with the washer 20 sandwiched as shown in FIG. 15, the torque for rotating the anchoring tool 30 rises rapidly. When the rotational torque exceeds a predetermined value, the nut 8 is firmly tightened against the surface 101 of the ceiling slab 100, so that the attachment strength of the anchor 1a is increased, and the anchor 1a is well attached to the ceiling slab 100. It becomes. Then, when the anchoring tool 30 is pulled out downward, the anchor 1a is applied to the ceiling slab 100 as shown in FIG.

  In the anchor 1a of this embodiment, the angle of the large screw thread 3a formed in the first screw part 3 of the shaft part 2 is larger than the angle of the screw thread of the metric screw and exceeds 60 degrees, as in the first embodiment. Since it is formed at an angle, the contact area between the screw thread 3a and the ceiling slab 100 is increased in the state where the construction is completed as shown in FIG. In addition, since the nut 8 mounted in advance on the second screw portion 4 is tightened to be firmly fixed in a state where it is joined to the surface 101 of the ceiling slab 100, the fixing strength of the anchor 1a is further increased by tightening the nut 8. Further increase. Therefore, even if a large-scale earthquake occurs, it is possible to satisfactorily prevent the portion into which the anchor 1a is screwed from being loosened, and to prevent the anchor 1a from being detached from the hole 102 in advance. It is. Then, as shown in FIG. 13, after the construction of the anchor 1a is completed, a work for attaching the ceiling structure to the male screw 4a of the second screw portion 4 exposed below the nut 8 is separately performed.

  As described above, in the present embodiment, when the screw-in type anchor 1a is constructed, the anchor application tool 30 described above is used so that the nut 8 is attached to the second screw portion 4 of the anchor 1a in advance. 1a can be applied to the hole 102. That is, the anchor 1a fitted with the nut 8 is inserted into the mounting hole 12 of the anchoring tool 30 as it is and attached, and the rotary tool 103 is engaged with the engagement hole 18 of the anchoring tool 30 to drive the rotary tool. By doing so, the anchor 1 a can be applied to the hole 102. At this time, by using a long shaft as the rotating shaft 103 to be mounted in the engagement hole 18 of the anchoring tool 30, the worker can perform the construction work while staying on the floor surface. There is no need to use a lift or a lifting lift, and the work can be carried out efficiently. When the operator drives the rotary tool and installs the anchor 1a in the hole 102, the operator continues the drive of the rotary tool until the torque of the rotary shaft 103 becomes equal to or higher than a predetermined value, whereby the first screw portion of the anchor 1a. The process of screwing 3 into the hole 102 and the process of tightening the nut 8 to the surface 101 of the ceiling slab 100 can be performed simultaneously by a series of operations, and the installation of the anchor 1a is completed efficiently. Therefore, if the anchor 1a and the anchoring tool 30 according to the present embodiment are used, the working time is shorter than the conventional one, and an increase in construction cost can be suppressed.

(Modification)
As mentioned above, although several embodiment regarding this invention was described, this invention is not limited to what was demonstrated in the said embodiment, A various modification is applicable.

  For example, although the case where the anchors 1 and 1a are mainly constructed on the ceiling slab 100 has been described in the above embodiment, the construction target of the anchors 1 and 1a described above is not limited to the ceiling slab. That is, even when the anchors 1 and 1a are applied to the holes formed on the wall surface and the floor surface, the step of screwing the first screw portion 3 into the hole and the state where the nuts 7 and 8 are joined to the slab surface It is possible to simultaneously perform the tightening process in a series of operations and improve the work efficiency.

DESCRIPTION OF SYMBOLS 1,1a Anchor 10,30 Anchor application tool 3 1st screw part 4 2nd screw part 7,8 Nut 5 Recessed part (engagement part)
6 Engaging part 9 Convex part (engaging part)
12 mounting hole 14 engaging projection (first engaging portion)
15 Hexagon hole (second engaging part)
19 Concave portion (first engaging portion)

Claims (4)

A first screw portion in which a plurality of screw threads having different heights are formed on one end side of the shaft portion;
A second screw portion formed on the other end side of the shaft portion;
An engaging portion that is formed at the other end side of the shaft portion and at an end portion of the second screw portion, and is protruded or recessed narrower than the diameter of the second screw portion;
A nut mounted in advance on the second screw part;
An anchor comprising:   As the anchoring tool is rotated in a state where the anchoring tool is engaged with both the engaging part and the nut, the shaft part and the nut rotate together to rotate the shaft part. The first screw part formed on one end side is screwed into a hole formed on the surface of the slab, and the engaging part is anchored when the first screw part is screwed into the hole to a predetermined depth. When the engagement with the tool is released and the anchoring tool is further rotated, the nut rotates with the shaft portion not rotating and advances the second screw portion toward the slab surface. The anchor according to claim 1, wherein the anchor is constructed such that an end surface of the nut is joined to the surface of the slab. A first screw portion formed on one end side of the shaft portion; a second screw portion formed on the other end side of the shaft portion; and a diameter of the second screw portion at an end portion on the other end side of the shaft portion. An anchoring tool for installing an anchor having an engaging portion that is more or less narrowly projecting or recessed and a nut that is previously attached to the second screw portion into a hole formed in the slab surface. There,
A mounting hole into which the second screw portion to which the nut is mounted can be inserted with the first screw portion of the anchor projecting on one end side, and the tip of the rotary tool is engaged on the other end side. A tool body with an engagement hole that can be mounted in a
A first engaging portion that engages with the engaging portion provided on the anchor is formed at the bottom of the mounting hole,
An anchoring tool, wherein a second engaging portion that engages with a side surface of the nut is formed on an inner wall of the mounting hole. A first screw portion formed on one end side of the shaft portion; a second screw portion formed on the other end side of the shaft portion; and a diameter of the second screw portion at an end portion on the other end side of the shaft portion. An anchor construction method in which an anchor having an engagement portion that is more narrowly projecting or recessed and a nut that is previously attached to the second screw portion is screwed into a hole formed on the surface of the slab. There,
A state in which the anchor is inserted into the mounting hole of the anchoring tool in which a mounting hole into which the second screw part to which the nut of the anchor is mounted is inserted is formed, and the first screw part of the anchor is protruded The first engagement portion formed on the bottom of the mounting hole is engaged with the engagement portion provided on the anchor, and the second engagement portion formed on the inner wall of the mounting hole is Engaging the side of the nut;
The anchor application tool is rotated in a state where the first engagement portion engages with the engagement portion provided on the anchor and the second engagement portion engages with a side surface of the nut. By rotating the shaft portion and the nut, the first screw portion of the anchor is screwed into the hole, and the peripheral edge tip of the mounting hole is brought into contact with the slab surface,
After the tip of the peripheral edge of the mounting hole contacts the slab surface, the first engaging portion engages with the engaging portion provided on the anchor, and the second engaging portion By rotating the anchor application tool while engaged with the side surface of the nut, the shaft portion and the nut are rotated to further screw the first screw portion of the anchor into the hole. Disengaging one engaging portion from the engaging portion provided on the anchor;
After the first engagement portion is disengaged from the engagement portion provided on the anchor, the anchor application tool is further rotated in a state where the second engagement portion is engaged with a side surface of the nut. The nut is rotated and advanced along the second screw part, and the end of the nut is fastened and fixed to the slab surface; and
The anchor construction method characterized by having.

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