JP2016048006A - Insert metal fitting - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an insert metal fitting capable of restraining a suspension bolt from separating even when a large-scale earthquake occurs.SOLUTION: An insert metal fitting 1 is inserted-installed into an installation hole of a deck plate, and comprises a metal fitting body 2 having a screw hole 17 for forming a female screw 17a on one end of a rod-like body 11 and providing a flange part 13 on the other end. This metal fitting body 2 has an elastic member 20 in the innermost part of the screw hole 17, and when a suspension bolt is installed in the screw hole 17, the elastic member 20 presses the tip of the suspension bolt, so that the looseness preventive effect of the suspension bolt is exhibited by increasing frictional force between the suspension bolt and the screw hole. Thus, even when a large-scale earthquake occurs, the suspension bolt is constituted so as not to separate from the insert metal fitting 1.SELECTED DRAWING: Figure 3

Description

  The present invention relates to an insert fitting that is inserted into a mounting hole of a deck plate to mount a suspension bolt that supports a suspended ceiling.

  Conventionally, in a reinforced concrete structure, after inserting an insert fitting into the mounting hole of the deck plate and placing a floor slab on the upper surface of the deck plate, it is suspended from the female screw hole of the insert fitting protruding from the lower surface of the deck plate. By attaching a bolt, a ceiling suspended object is attached to the hanging bolt (for example, Patent Document 1).

JP 2008-297699 A

  By the way, in recent years, for example, it has been required to prevent falling objects from falling from a ceiling even in the event of a large-scale earthquake that exceeds expectations. The same applies to the case where the suspension bolt is attached to the insert fitting, and it is required that the suspension bolt is not detached from the insert fitting even when a large-scale earthquake occurs.

  However, since the suspension bolt is only screwed into the female screw hole of the insert fitting, if the suspension bolt continues to vibrate for a long time due to a large-scale earthquake, the suspension bolt is gradually loosened. , There is a possibility of detaching from the insert fitting.

  Therefore, the present invention has been made to solve the above-described problem, and an object of the present invention is to provide an insert fitting that can reduce the possibility that a suspension bolt is detached.

  In order to achieve the above object, the present invention provides an insert fitting (1) to be inserted into the mounting hole (8a) of the deck plate (8), wherein a female screw (17a) is provided at one end of the rod-like body (11). A metal fitting body (2) having a formed screw hole (17) and having a flange (13) at the other end is provided, and the metal fitting body (2) is provided at the back of the screw hole (17). It has an elastic member (20), and when the suspension bolt (10) is attached to the screw hole (17), the elastic member (20) presses the tip of the suspension bolt (10). It is a configuration. According to such a configuration, when the suspension bolt (10) is inserted and mounted in the screw hole (17), the elastic member (20) presses the tip of the suspension bolt, and the suspension bolt (10) and the screw hole (17) In order to increase the frictional force of the hanger, it exerts the effect of preventing the suspension bolt from loosening.

  Further, in the above configuration, the metal fitting body (2) has a through hole (12) penetrating from one end of the rod-shaped body (11) to the other end, and a range of a predetermined depth from one end of the rod-shaped body (12). By forming the female screw (17a) inside, at least a part of the through hole (12) constitutes the screw hole (17), and a cap (6 ) And the elastic member (20) may be mounted on the cap (6). If such a configuration is adopted, the elastic member (20) can be provided in the inner part of the screw hole (17) relatively easily.

  In the above configuration, the elastic member (20) is a coil spring (21), and the coil spring (21) is mounted in a state where one end is engaged with an engagement portion (6d) provided on the cap (6). It is good also as a structure. According to such a configuration, the coil spring (21) can be disposed at the back of the screw hole (17) so as not to be detached from the screw hole (17).

  According to the insert metal fitting (1) of the present invention, the elastic member (20) presses the tip of the suspension bolt so that the tip of the suspension bolt is inserted and mounted all the way into the screw hole (17). Since the hole (17) can be firmly engaged, even if a large-scale earthquake occurs, the suspension bolt can be prevented from being detached from the insert fitting (1). become.

It is a perspective view in the state where each member of the insert metal fitting was assembled. It is a perspective view of the state which separated each member of insert metal fittings. It is sectional drawing of the state which assembled | attached each member of the insert metal fitting. It is sectional drawing which shows the state which mounted | wore the insert metal fitting to the deck plate. It is sectional drawing which shows the state which laid the floor slab on the upper surface of the deck plate. It is sectional drawing which shows the state which attached the hanger bolt with respect to the insert metal fitting. It is sectional drawing which shows the modification of insert metal fittings.

  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.

  1, 2, and 3 are views showing an insert fitting 1 according to an embodiment of the present invention. FIG. 1 is a perspective view of a state in which each member is assembled, and FIG. 2 is a state in which each member is separated. FIG. 3 is a cross-sectional view of the insert fitting 1 in a state where the respective members are assembled. This insert metal fitting 1 has a steel metal fitting body 2 constituted by a substantially cylindrical rod-like body 11 as a main member, and includes a coil spring 3, a ring member 4, a retaining member 5 and a cap 6 attached to the metal fitting body 2. It is the composition provided.

  As shown in FIG. 3, the metal fitting body 2 has a through hole 12 that penetrates the axial center portion of the rod-shaped body 11 from one end (lower end) to the other end (upper end). The through hole 12 is a screw hole 17 in which a female screw 17a is formed on the inner surface from one end (lower end) to a position of a predetermined depth. However, the through hole 12 is not limited to a part of the through hole 12 configured as the screw hole 17 as illustrated, but the female screw 17a is formed on the entire inside of the through hole 12 so that the entire through hole 12 is configured as the screw hole 17. May be. Such a screw hole 17 is in a state opened at one end (lower end) of the rod-shaped body 11.

  The screw hole 17 opened at one end of the rod-shaped body 11 may be formed as a bottomed hole that does not penetrate to the other end of the rod-shaped body 11. However, if the screw hole 17 is a bottomed hole, the weight of the metal fitting body 2 increases, so that the work efficiency when an operator works while carrying many insert metal fittings 1 deteriorates. On the other hand, if the screw hole 17 is formed as the through hole 12 as described above, the weight of the insert fitting 1 can be reduced, so that the operator can carry more insert fittings 1 and work efficiency. Is preferable in terms of improvement.

  The metal fitting body 2 has a flange 13 protruding radially outward at the other end (upper end) of the rod-shaped body 11, and the upper end opening of the through hole 12 is formed at the center position of the end surface of the flange 13. Yes. A cap 6 made of synthetic resin or the like is attached to the upper end opening, and the upper end opening of the through hole 12 is closed. The cap 6 has a lid portion 6a that closes the upper end opening of the through hole 12, a cylindrical body portion 6b that is in close contact with the inner surface of the through hole 12, and a holding portion that is provided below the body portion 6b. Part 6c. The holding portion 6c is formed in a columnar shape having a smaller diameter than the body portion 6b, and a plurality of protrusions 6d protruding outward in the radial direction are provided at a lower end portion of the periphery. As shown in FIG. 2, the holding portion 6 c is engaged with an end portion of a coil spring 21 that can be inserted into the through hole 12.

  The coil spring 21 is provided as the elastic member 20 and is a spring wound to have a smaller diameter than the inner diameter of the through-hole 12, and is attached to the holding portion 6c with one end engaged with the protrusion 6d. The coil spring 21 in FIG. 2 shows an example in which a wire is wound with substantially the same diameter from one end to the other end. However, the present invention is not limited to this, and the coil spring 21 may be formed in the shape of a truncated cone as a whole by winding a wire so that the diameter gradually decreases from one end to the other end. In this case, the large-diameter end portion of the coil spring 21 is attached to the holding portion 6c of the cap 6, and is attached so as not to be detached from the cap 6 by engaging with the protrusion 6d.

  The cap 6 with the coil spring 21 attached to the holding portion 6 c is attached to the upper end opening of the through hole 12 with the tip of the coil spring 21 inserted into the through hole 12. Therefore, when the cap 6 is attached to the upper end opening of the through-hole 12, the coil spring 21 has the proximal end 21a held by the holding portion 6c of the cap 6 and the distal end 21b as shown in FIG. It will be located in the area | region in which the female screw 17a was formed exceeding the back end part (upper end part) 17b of the screw hole 17. FIG. That is, the coil spring 21 that is the elastic member 20 is in a state of being provided in the inner part of the screw hole 17 in the metal fitting body 2.

  The coil spring 21 presses the tip of the suspension bolt attached to the screw hole 17. That is, when the suspension bolt is inserted deeply into the screw hole 17, the tip end portion 21 b of the coil spring 21 comes into contact with the tip of the suspension bolt, and the suspension bolt is further screwed into the screw hole 17. As a result, the coil spring 21 is compressed and deformed, and the tip of the suspension bolt is pressed with an urging force corresponding to the amount of deformation. When a pressing force by the coil spring 21 acts on the suspension bolt, the contact state of the female screw 17a with the screw thread and the screw groove becomes dense, and the frictional force increases. The increase in the frictional force exerts an effect of preventing the suspension bolt from loosening, and prevents the suspension bolt from being detached from the screw hole 17.

  The flange portion 13 has notches 14a, 14b, and 14c in which three peripheral portions of a disc-like shape having a predetermined radius from the axial center of the rod-like body 11 are linearly cut. By these cutout portions 14a, 14b, and 14c, the flange portion 13 is configured as a non-circular shape in plan view. By making the collar portion 13 non-circular, it is possible to prevent the insert fitting 1 from being carried around with the suspension bolt when the suspension bolt is attached to the screw hole 17.

  Moreover, the metal fitting body 2 has an annular groove 15 formed at a predetermined distance from one end (lower end) on the outer peripheral surface of the rod-shaped body 11 as shown in FIG. The annular groove 15 is for positioning and fixing the retaining member 5 to one end of the rod-shaped body 11 by fitting a projection 54 provided inside the retaining member 5 as shown in FIG.

  The coil spring 3 is a metal spring having an inner diameter slightly larger than that of the rod-shaped body 11 of the metal fitting body 2 and smaller than the diameter of the flange 13. The coil spring 3 is mounted from one end (lower end) of the rod-shaped body 11 to the outside of the rod-shaped body 11.

  The ring member 4 is a metal member having an outer diameter larger than a diameter of a mounting hole provided in the deck plate and an inner diameter larger than the diameter of the rod-shaped body 11 of the metal fitting body 2. The inner diameter of the ring member 4 is formed smaller than the inner diameter of the coil spring 3. The ring member 4 is attached to the outside of the rod-shaped body 11 from one end (lower end) of the rod-shaped body 11 with the coil spring 3 mounted.

  The retaining member 5 is made of, for example, a synthetic resin, and includes a cylindrical fixing portion 51 provided with a protrusion 54 on the inner side thereof, and a retaining portion 52 provided to be connected to the upper edge portion of the fixing portion 51. Configured. The retaining portion 52 includes a plurality of expanding portions 53a, 53b, and 53c that expand further upward in a bowl shape from a plurality of locations on the upper edge of the fixing portion 51. The retaining member 5 is mounted from one end (lower end) of the rod-shaped body 11 to the outside of the rod-shaped body 11 with the coil spring 3 and the ring member 4 mounted. Then, as shown in FIG. 3, when the projection 54 provided inside the fixing portion 51 is fitted into the annular groove 15 of the metal fitting body 2, the retaining member 5 is fixed to one end (lower end) of the metal fitting body 2. When the retaining member 5 is fixed to the metal fitting body 2, the upper ends of the expanded portions 53 a, 53 b, and 53 c are in contact with the lower surface of the ring member 4, so that the ring member 4 and the coil spring 3 are connected to the metal fitting body 2. It will not detach from the rod 11.

  Next, the construction procedure of the insert metal fitting 1 configured as described above will be described. 4, 5, and 6 are diagrams showing a construction procedure until the insert metal fitting 1 is mounted on the deck plate 8 and the suspension bolt is connected to the insert metal fitting 1.

  First, as shown in FIG. 4, the insert fitting 1 having the above-described configuration is mounted in a mounting hole 8 a provided in the deck plate 8 in advance. The diameter of the mounting hole 8a is formed to be slightly larger than the diameter of the fixed portion 51 of the retaining member 5, and the retaining member 5 attached to the insert fitting 1 from the upper surface side of the deck plate 8 is placed below the mounting hole 8a. By inserting, the insert fitting 1 is mounted in the mounting hole 8a. When the retaining member 5 passes through the mounting hole 8a, the plurality of expanded portions 53a, 53b, 53c are contracted inward by the inner wall of the mounting hole 8a, and pass through the mounting hole 8a in the contracted state. When the upper ends of the plurality of expanded portions 53a, 53b, and 53c pass through the mounting hole 8a, the expanded portions 53a, 53b, and 53c are expanded outward again by the elastic force, and the deck plate 8 around the mounting hole 8a. It comes in contact with the lower surface side of. Therefore, the insert fitting 1 is in a state where it cannot be removed from the mounting hole 8 a of the deck plate 8.

  As shown in FIG. 4, when the insert fitting 1 is mounted in the mounting hole 8a of the deck plate 8, the ring member 4 contacts the upper surface of the deck plate 8, and the coil spring 3 that contacts the upper surface of the ring member 4 is the bracket main body. The urging force is applied in a direction in which the second collar 13 is pushed upward. Therefore, the insert fitting 1 is held in a state in which only the portion where the retaining member 5 is provided protrudes from the lower surface of the deck plate 8 and most of the other portions protrude from the upper surface side of the deck plate 8.

  Next, as shown in FIG. 5, a floor slab 9 such as concrete is placed on the upper side of the deck plate 8 on which the insert fitting 1 is mounted. At this time, the floor slab 9 wraps around the portion of the insert fitting 1 that protrudes from the upper surface of the deck plate 8, and the floor slab 9 is also filled around and below the flange portion 13. The insert fitting 1 is fixed by the floor slab 9 as the floor slab 9 is solidified.

  Subsequently, as shown in FIG. 6, the suspension bolt 10 is attached to the screw hole 17 of the insert fitting 1 protruding from the lower surface of the deck plate 8. At this time, when the operator inserts the tip of the suspension bolt 10 into the screw hole 17 and rotates the suspension bolt 10 clockwise, the suspension bolt 10 advances and engages with the screw hole 17 toward the back. . Until the tip 10a of the suspension bolt 10 reaches the tip 21b of the coil spring 21, the torque required to rotate the suspension bolt 10 is relatively small. Therefore, the operator smoothly inserts the suspension bolt 10 into the screw hole 17. Can continue. When the suspension bolt 10 is inserted into the screw hole 17, the floor slab 9 is in close contact with the periphery of the non-circular flange 13, so that the metal fitting body 2 is suspended even when the suspension bolt 10 rotates. Do not rotate with the bolt 10.

  Then, when the tip 10a of the suspension bolt 10 reaches the position of the tip 21b of the coil spring 21, the suspension bolt 10 receives a pressing force from the coil spring 21, so that torque required for rotating the suspension bolt 21 thereafter. Gradually grows. Then, when the tip 10a of the suspension bolt 10 reaches the terminal position where the female screw 17a is formed (the back end portion 17b of the screw hole 17 shown in FIG. 3) as shown in FIG. 6, the torque when the suspension bolt 10 is rotated. Becomes extremely large, and the suspension bolt 10 cannot be rotated any more, and the mounting of the suspension bolt 10 is completed.

  At this time, as shown in FIG. 6, the coil spring 21 is compressed and deformed by mounting the suspension bolt 10, and presses the tip portion 10 a of the suspension bolt 10 downward. Due to this pressing force, the male screw portion formed on the suspension bolt 10 and the female screw 17a formed on the screw hole 17 are closely engaged with each other to generate a large frictional force. Even if it acts, it becomes possible to satisfactorily prevent the suspension bolt 10 from loosening. Therefore, the insert fitting 1 of the present embodiment can reduce the possibility that the suspension bolt 10 is detached from the screw hole 17 even when a large-scale earthquake exceeding the assumption occurs.

  FIG. 7 is a cross-sectional view showing the insert fitting 1 in which a rubber 22 is provided as the elastic member 20 instead of the coil spring 21. As shown in FIG. 7, the rubber 22 provided as the elastic member 20 has an upper end engaged with and held on the inside of the cap 6, and a lower portion of the rubber 22 has a tapered shape whose diameter is reduced toward the axial center of the rod-shaped body 11. It is formed. The lower end portion 22a having a reduced diameter of the rubber 22 is disposed so as to be positioned in a region where the female screw 17a is formed beyond the back end portion (upper end portion) 17b of the screw hole 17 as in the case of the coil spring 21. . That is, the rubber 22 provided as the elastic member 20 in FIG. 7 is in a state of being provided in the inner part of the screw hole 17 in the metal fitting body 2. Even when the rubber 22 is arranged in the inner part of the screw hole 17 in this way, the rubber 22 can press the tip of the suspension bolt attached to the screw hole 17. In other words, the rubber 22 presses the tip of the suspension bolt attached to the screw hole 17 to increase the frictional force as in the case of the coil spring 21 to close the contact state between the suspension bolt and the female screw 17a. Then, the effect of preventing the suspension bolt from loosening can be exhibited, and the suspension bolt can be prevented from being detached from the screw hole 17.

  As described above, the insert metal fitting 1 of the present embodiment includes the metal fitting body 2 having the screw hole 17 in which the female screw 17a is formed at one end of the rod-like body 11 and the flange portion 13 provided at the other end. In addition, an elastic member 20 is provided at the back of the screw hole 17 of the metal fitting body 2. When the suspension bolt 10 is attached to the screw hole 17, the elastic member 20 presses the tip 10 a of the suspension bolt 10, thereby exhibiting the effect of preventing the suspension bolt 10 from loosening, and the suspension bolt 10 is detached from the screw hole 17. To prevent it. Since the insert fitting 1 having such a configuration is a relatively simple configuration, there is an advantage that the suspension bolt 10 can be prevented from being detached at a low cost.

  Moreover, in the insert metal fitting 1 of this embodiment, the metal fitting body 2 has a through hole 12 that penetrates from one end of the rod-shaped body 11 to the other end, and has a predetermined depth from one end of the rod-shaped body 11 with respect to the through-hole 12. By forming the female screw 17 a within the range, at least a part of the through hole 12 is configured as the screw hole 17. The cap 6 is attached to the other end opening of the through hole 12, and the elastic member 20 is attached to the cap 6. According to such a configuration, the weight of the insert fitting 1 can be reduced, so that the carrying performance of the insert fitting 1 can be improved and the elastic member 20 is not detached from the screw hole 17 by a relatively simple operation. Thus, it is possible to attach to the back of the screw hole 17.

  As mentioned above, although one Embodiment regarding this invention was described, this invention is not limited to the thing of the content mentioned above. For example, although the example using the coil spring 21 and the example using the rubber 22 have been described as an example of the elastic member 20 in the above embodiment, the elastic member 20 is not limited to the coil spring 21 or the rubber 22. That is, the elastic member 20 may be of any material or structure as long as it can press the tip of the suspension bolt attached to the screw hole 17.

DESCRIPTION OF SYMBOLS 1 Insert metal fitting 2 Metal fitting body 6 Cap 8 Deck plate 8a Mounting hole 11 Rod-shaped body 12 Through-hole 13 Hook 17 Screw hole 17a Female screw 20 Elastic member 21 Coil spring 22 Rubber

Claims (3)

An insert fitting that is inserted into the mounting hole of the deck plate,
It has a screw hole in which a female screw is formed at one end of a rod-like body, and a metal fitting body provided with a flange on the other end,
The metal fitting body has an elastic member at the back of the screw hole, and the elastic member presses the tip of the hanging bolt when a hanging bolt is attached to the screw hole.   The metal fitting body has a through hole penetrating from one end to the other end of the rod-shaped body, and at least one of the through holes is formed by forming the female screw within a predetermined depth from one end of the rod-shaped body. The insert metal fitting according to claim 1, wherein a portion constitutes the screw hole, a cap is attached to the other end opening of the through hole, and the elastic member is attached to the cap.   The insert fitting according to claim 2, wherein the elastic member is a coil spring, and the coil spring is mounted in a state where one end is engaged with an engaging portion provided in the cap.

Images