JP5439023B2 - Ceiling foundation structure - Google Patents

Description

  The present invention relates to a ceiling foundation structure, and more particularly, for example, a hanger that is screwed to a bolt when a hanger that supports a field receiver in a building structure is attached to a mounting bolt embedded in a casing ceiling. The present invention relates to a ceiling base structure that prevents loosening of a mounting nut.

  In general, it is well known that a ceiling foundation structure is installed on a ceiling portion of a building structure such as a reinforced concrete structure at a predetermined interval from the casing ceiling portion. The ceiling foundation structure is constructed by assembling a number of field edges and a number of field edge receivers in a lattice pattern, and the field edge receiver is composed of mounting bolts embedded in the frame ceiling and hangers attached to the mounting bolts. The field edge is connected to the field edge receiver using a fixing clip or the like. The ceiling panel is attached to the field edge of the ceiling foundation structure.

  The ceiling foundation structure is used not only to support the ceiling panel but also to support so-called electric wires and communication cables wired on the back of the ceiling, or various installed objects. The field edge receiver to which the field edge is connected is supported by a hanger as disclosed in Patent Document 1, and the hanger is attached to two mounting bolts embedded in the casing ceiling (ceiling slab) as described above. It is connected by a nut. This structure will be described in more detail. The hanger is formed by bending an elongated plate member along a bending line that is along the surface of the plate member and orthogonal to the longitudinal direction. That is, the hanger protrudes from the substrate portion, one end of the substrate portion at a substantially right angle, a mounting plate provided with a hole for inserting the mounting bolt, and a receptacle protruding from the other end of the substrate to the opposite side of the mounting plate at a substantially right angle. It is formed of a plate and a pressing plate extending substantially in parallel with the substrate in the direction of one end of the substrate from the front end portion of the receiving plate.

  The holding plate, the receiving plate, and a part of the substrate facing the holding plate that form such a hanger have a U-shape, and this U-shaped portion becomes a field edge receiving portion, and a field is formed in the inner groove portion. An edge receiver is fitted and supported. When such a hanger is attached to a mounting bolt substantially embedded in the casing ceiling, a nut is screwed in advance to the mounting bolt, and then the mounting bolt is relatively moved into the hole of the mounting plate. After passing, the other nut is screwed onto the mounting bolt, and the hanger is fixed by sandwiching the mounting plate between the two nuts at a predetermined position.

JP 2008-025271 A

  By the way, depending on the location of a building structure, there are various low-frequency or high-frequency vibrations that are not felt by humans, such as vibrations generated by vehicles traveling on the road, vibrations generated by railways running on the ground and underground, and earthquake vibrations. Continued to receive strong vibrations. Therefore, in the ceiling foundation structure that is attached to the inside of the building structure by the above-described method, the nut that is screwed to the attachment bolt and sandwiches the attachment portion of the hanger is loosened for a long time, and the hanger is Gradually move downward. Each of the edge supports of the ceiling foundation structure is suspended and supported at a certain height by hangers attached to a large number of mounting bolts, so that one or several of the hangers can be moved downward from a predetermined position. If it is displaced, it will be substantially useless, and the total load of the ceiling foundation structure will be applied to other hangers in the normal position, resulting in an error in the pre-designed load support distribution. The number of hangers that have stopped functioning at an accelerated rate will continue to increase as the seeds vibrate, and the load-bearing distribution will become increasingly distorted.

  As described above, when some hangers are not substantially loaded, that is, do not function, the load distribution distribution starts to accelerate as described above. If there is, the shaking of the ceiling foundation structure will increase and give a large impact to the hanger and mounting bolts. Also, if the ceiling foundation structure starts to shake significantly, the ceiling foundation structure will collide with the wall, etc., resulting in a large impact on the hangers and mounting bolts. It is also expected to cause destruction of the body itself.

  An object of the present invention is to solve such a conventional problem. When a hanger supporting a field receiver is fixed using a mounting nut screwed to a mounting bolt, the mounting It is an object of the present invention to provide a ceiling base structure that does not loosen and cause the hanger to move even if the nut continues to receive various vibrations.

The first invention is a mounting bolt that is attached to the skeleton ceiling of the building structure, a hanger attached to the mounting bolt, and field edge receiving supported by the hanger, connected to receive the field edge The hanger is formed on a plate-like substrate, a mounting plate provided with an insertion portion through which the mounting bolt is inserted, extending substantially perpendicularly from one end of the substrate, and formed on the other end of the substrate. The first and second nuts, which are formed by the field edge receiving fitting portion, and the attachment plate of the hanger is screwed to the attachment bolt that passes through the insertion portion, and the lower fastening surface of the attachment plate The ceiling foundation structure is fastened to the upper fastening surface and fixed to the mounting bolt. The feature of the ceiling foundation structure is that the ceiling foundation structure is loosened by both the first nut and the first and second nuts. Includes a nut locking means for preventing, the nut locking means is constructed from a first projecting piece formed by putting at least one notch from the edge of the mounting plate in the hanger, said first protrusion Is pressed against the outer peripheral surface of the first nut that is bent and contacts the lower tightening surface of the mounting plate to prevent the first nut from rotating .

In another embodiment of the ceiling foundation structure according to the first invention , the nut loosening prevention means has at least one cut from the end edge of the mounting plate in the hanger having the first projecting piece. A second projecting piece formed, and the second projecting piece is bent and pressed against the outer peripheral surface of the second nut contacting the upper fastening surface of the mounting plate to prevent rotation of the second nut. It is said that.

A second aspect of the present invention is a mounting bolt attached to a building ceiling of a building structure, a hanger attached to the mounting bolt, a field receiver supported by the hanger, and the field receiver. And a mounting plate having a plate-like substrate, an insertion portion for projecting the mounting bolt through the mounting bolt, and the other end side of the substrate. The first and second nuts are tightened on the lower side of the mounting plate, and the mounting plate of the hanger is screwed to the mounting bolt passing through the insertion portion. A ceiling base structure that is fastened to a surface and an upper tightening surface and is fixed to the mounting bolt, wherein the ceiling base structure is characterized in that both the first nut and the first and second nuts are provided. Includes a nut locking means for preventing loosening of the nut locking means, said consist detachably loaded nut locking clip to the attachment bolt, the nut locking clip, the bottom of the first nut The upper piece and the lower piece are composed of an upper piece portion located at the top, a lower piece portion located above the second nut, and a connecting piece portion connecting the upper piece portion and the lower piece portion. A notch groove into which the mounting bolt is fitted is formed in the part, and the notch groove formed in the upper piece part and the lower piece part is formed in the screw groove of the mounting bolt on the inner edge part thereof. A lockable edge is provided.

As another embodiment of the ceiling foundation structure according to the second invention , the notch grooves formed in the upper piece portion and the lower piece portion of the nut loosening prevention clip are connected to the connecting piece portion, respectively. The top piece is cut from the leading edge opposite to the connecting end toward the connecting end, and the width dimension is substantially equal to the effective diameter of the mounting bolt or slightly larger than the diameter of the trough, The inner edge portion of the notch groove itself forms the locking edge by forming the portion and the lower piece portion with a plate material having a thickness slightly smaller than the pitch of the mounting bolt.

  According to the ceiling foundation structure according to the present invention, the ceiling foundation structure includes the nut loosening prevention means for preventing both the first nut and the first and second nuts from loosening, so that at least the first nut is provided. Even if the nut is loosened by vibrations and tries to rotate away from the mounting bolt, the first nut will not loosen, and therefore the hanger will not move. Therefore, an equal supporting load on all mounting bolts can be maintained. The initial strength of the ceiling foundation structure can be maintained over a long period of time. That is, since the first nut is a main part that suspends the field edge receiver and the field edge connected thereto via the hanger, when the first nut is loosened by vibration and rotated in a direction away from the mounting bolt, Substantially the hanger support effect of the hanger by the mounting bolt is lost. Therefore, if at least the loosening of the first nut is prevented, the hanging support effect of the hanger by the mounting bolt can be maintained.

  On the other hand, the second nut not only prevents the hanger from moving upward, but is also a part that exerts the tightening effect of the first nut that comes into contact with the lower tightening surface of the mounting plate. Preventing this also prevents loosening of the first nut. Therefore, it is preferable that the nut loosening prevention means prevent not only the first nut but also the second nut.

  According to a ceiling foundation structure according to another embodiment of the present invention, the nut loosening prevention means is constituted by a first projecting piece formed by making at least one cut from an edge of the hanger mounting plate, Since the first projecting piece is bent and pressed against the outer peripheral surface of the first nut contacting the lower tightening surface of the mounting plate to prevent the first nut from rotating, the first nut is loosened by vibration. Even if it tries to rotate in the direction away from the mounting bolt, the rotation is prevented by hitting the first projecting piece. As a result, the first nut does not loosen and the hanger does not move, so that it is possible to maintain a uniform supporting load on all the mounting bolts, and to maintain the initial strength of the ceiling foundation structure over a long period of time. Can be maintained.

  According to a ceiling foundation structure according to another embodiment of the present invention, the nut loosening prevention means has a second protrusion formed by cutting at least one notch from the edge of the mounting plate of the hanger having the first protrusion. And the second projecting piece is bent and pressed against the outer peripheral surface of the second nut contacting the upper clamping surface of the mounting plate to prevent the second nut from rotating. Even if it is loosened by the vibration and tries to rotate in the direction away from the upper fastening surface of the mounting portion, the rotation is prevented by hitting the second projecting piece. As a result, the second nut is not loosened, and the hanger mounting portion is firmly held between the first nut and the second nut. As a result, the hanger can be prevented from shifting, and an equal support load on all the mounting bolts can be maintained, and the initial strength of the ceiling foundation structure can be maintained over a long period of time.

  According to the ceiling foundation structure according to another embodiment of the present invention, a separate nut locking clip is attached to the mounting bolt as a nut locking mechanism, and the nut locking clip has an upper piece and a lower piece. When the mounting bolt is relatively fitted in the notch groove formed in the part, the locking edge formed on the inner edge of the notch groove enters and locks into the screw groove of the mounting bolt. The upper piece and the lower piece do not move in the axial direction of the mounting bolt, so that the movement of the first nut and the second nut in the axial direction of the mounting bolt sandwiching the fixing portion of the hanger is fixed. Is prevented. As a result, the two nuts do not loosen, and the hanger mounting portion continues to be firmly held between the first nut and the second nut. As a result, the hanger can be prevented from shifting, and an equal support load on all the mounting bolts can be maintained, and the initial strength of the ceiling foundation structure can be maintained over a long period of time. The locking edge formed at the inner edge of the notch groove is formed, for example, by chamfering the upper and lower corners at the inner edge of the notch groove and tapering it to a thickness smaller than the pitch of the mounting bolt. Can do.

  According to the ceiling foundation structure according to another embodiment of the present invention, the upper piece portion and the lower piece portion of the nut locking clip are formed by a plate material having a thickness slightly smaller than the pitch of the mounting bolts. Since the inner edge of the groove itself is a locking edge, there is no need to bother to form a locking edge that goes into the screw groove of the mounting bolt, so a nut locking clip can be prepared inexpensively and easily. it can.

1 is a perspective view schematically showing a ceiling foundation structure according to an embodiment of the present invention. The perspective view which shows the attachment state of the attachment volt | bolt and hanger which comprise the ceiling base structure shown by FIG. The top view which looked at the hanger fixed to the attachment bolt with the nut from the housing ceiling part side. The front view which shows the hanger fixed to the attachment volt | bolt shown by FIG. 3 with the nut. The perspective view which shows the fixed state of the hanger and the attachment bolt in the ceiling foundation structure which concerns on other embodiment of this invention. The perspective view which shows the nut locking clip used for fixing the hanger shown in FIG. 6 to a mounting bolt.

  FIG. 1 schematically shows a ceiling foundation structure 10 according to a preferred embodiment of the present invention. The ceiling foundation structure 10 includes a mounting bolt 11 attached to a housing ceiling (not shown) of a building structure, a hanger 12 attached to the mounting bolt 11, and a field edge supported by the hanger 12. It comprises a receiver 13 and a field edge 14 connected to the field edge receiver 13. The ceiling panel P is attached to the field edge 14 using screws or the like.

  As shown in FIGS. 2 to 4, the hanger 12 that supports the field receiver 13 includes an elongated plate-like substrate 15, a mounting plate 17 that protrudes from the one end 15 a of the substrate 15 almost at right angles, and the substrate 15. It is comprised from the U-shaped part 18 formed in the end 15b side. A hole 16 is formed in the mounting plate 17 as an insertion portion through which the mounting bolt 11 is inserted. The U-shaped portion 18 has a receiving plate 18a projecting from the other end 15b of the substrate 15 to the opposite side of the mounting plate 17 at a substantially right angle, and substantially the same as the substrate 15 in the direction of one end 15a of the substrate 15 from the distal end portion of the receiving plate 18a. The U-shaped portion 18 forms a field edge receiving fitting portion, which is formed by a pressing plate 18b extending in parallel and a part of the substrate 15 facing the pressing plate 18b. The field edge receiver 13 is usually a long material having a U-shaped cross section, and is supported by being fitted into the groove portion 18 c of the U-shaped portion 18.

  The hanger 12 is attached to the attachment bolt 11 so that the attachment bolt 11 is relatively inserted into the hole 16 of the attachment plate 17, and is attached by the first nut 19 and the second nut 20 screwed into the attachment bolt 11. The plate 17 is fixed at a predetermined position by being clamped so as to be sandwiched between the lower clamping surface 17a and the upper clamping surface 17b. The second nut 20 abutting against the upper clamping surface 17b of the mounting plate 17 in the hanger 12 prevents the hanger 12 from moving upward as shown in FIG. 1 and contacts the lower clamping surface 17a of the mounting plate 17. This is a part that exerts the tightening effect of the first nut 19 in contact therewith. Therefore, even if the second nut 20 is loosened, the load applied to the hanger 12 is not immediately transmitted to the mounting bolt 11. Therefore, the looseness of the first nut 19 that contacts the lower tightening surface 17a of the mounting plate 17 becomes a very big problem. That is, when the first nut 19 is loosened and rotates in a direction away from the mounting bolt 11, the load applied to the hanger 12 is separated from the mounting plate 17 and is not transmitted to the mounting bolt 11. No longer works.

  The general phenomenon that occurs as a result will be described. The total load of the ceiling foundation structure 10 is applied to the mounting bolt 11 via another hanger at a normal position, and the load support distribution designed in advance is distorted. Occurs. Such an error in the load support distribution increases the load on the mounting bolts 11 that support other hangers, and the number of hangers that do not function in the same manner due to vibrations that are continuously received increases at an accelerated rate. The madness is getting bigger and bigger. In addition, when some hangers are not substantially loaded, that is, do not function in this manner, as described above, the deviation of the load support distribution starts to accelerate and is relatively large in such a state. If there is an earthquake or the like, the shaking of the ceiling foundation structure will increase and give a large impact to the hanger and mounting bolts. And if the ceiling foundation structure shakes greatly, the ceiling foundation structure will collide with the wall etc. as a result, and it will also give a big impact to the hanger and mounting bolts. It is also expected to destroy itself.

Therefore, the ceiling foundation structure 10 of the present invention includes nut loosening prevention means for preventing loosening of the two nuts that fix the hanger 12 to the mounting bolt 11. An example of the nut locking means is shown in FIGS. That is, in the ceiling foundation structure 10 of the embodiment shown in each of these drawings, the first projecting piece 22 and the second projecting piece 24 formed on the edge of the mounting plate 17 in the hanger 12 are used as nut loosening prevention means. . Each of these protrusions 22 and 24 is formed by making two cuts 21a, 21b, 23a, and 23b at intervals on the edge of the mounting plate 17 of the hanger 12, as shown in FIGS. It is formed between the cuts. The first projecting piece 22 and the second projecting piece 24 are formed at positions close to the left and right sides in the width direction of the mounting plate 17.

  The first protrusion 22 is bent toward the outer peripheral surface of the first nut 19 after the mounting plate 17 of the hanger 12 is fixed to a predetermined position of the mounting bolt 11 by the first nut 19 and the second nut 20. The second nut 24 is pressed against the outer peripheral surface of the first nut 19, and the second projecting piece 24 is bent toward the outer peripheral surface of the second nut 20 and pressed against the outer peripheral surface of the second nut 20. Such bending of the first projecting piece 22 and the second projecting piece 24 is performed by an operator when the ceiling base structure 10 is assembled on site. FIG. 4 clearly shows a state in which the first projecting piece 22 and the second projecting piece 24 are respectively bent and pressed against the outer peripheral surfaces of the first nut 19 and the second nut 20.

  Thereby, even if the rotational force by vibration etc. is applied to the 1st nut 19 and the 2nd nut 20, the outer surface of the 1st nut 19 and the 2nd nut 20 collides with the 1st protrusion piece 22 and the 2nd protrusion piece 24, respectively. Rotation will be prevented. Accordingly, the first projecting piece 22 and the second projecting piece 24 function as detents for the first nut 19 and the second nut 20, respectively. In the embodiment described above, the first projecting piece 22 and the second projecting piece 23 are formed by two cuts 21a, 21b, 23a, 23b, respectively. If it is going to form a piece, one cut is sufficient for each.

  Next, with reference to FIGS. 5 and 6, another example of the nut loosening prevention means provided in the ceiling foundation structure 10 of the present invention will be described. That is, in the ceiling foundation structure 10 according to another embodiment of the present invention, the nut loosening prevention means is provided by a nut loosening prevention clip (hereinafter referred to as a clip) 25 formed separately from the mounting bolt 11 and the hanger 12. It is configured. The clip 25 is detachably attached to the mounting bolt 11, and is formed into a U-shape composed of an upper piece portion 26, a lower piece portion 27, and a connecting piece portion 28 for connecting these upper and lower piece portions. Presents. Specifically, the clip 25 projects from the one end 28 a of the elongated connecting piece portion 28 so that the upper piece portion 26 is substantially perpendicular to the surface of the connecting piece portion, and the lower piece portion 27 extends from the connecting piece portion 28. It is configured to project in parallel with the upper piece portion 26 and in the same direction so as to be substantially orthogonal to the surface of the connecting piece portion from the other end 28b. Such a clip 25 is integrally formed by bending a relatively thin metal plate having a spring property and having a predetermined length.

  Each of the upper piece portion 26 and the lower piece portion 27 is formed with U-shaped notch grooves 26a and 27a for mounting on the mounting bolt 11 as shown in FIG. This notch groove 26a is cut from the front end portions 26b, 27b of the upper piece portion 26 located on the opposite side to the one end 28a of the connecting piece portion 28 toward the one end 28a of the connecting piece portion 28, and the deepest portion thereof is It is curved with the same curvature as the radius of the mounting bolt 11. On the other hand, the notch groove 27a is formed in the lower piece 27 in exactly the same manner as the notch groove 26a, and the two notch grooves 26a and 27a are perfectly aligned when viewed from the upper surface of the upper piece 26. Thus, the upper piece portion 26 and the lower piece portion 27 have a fork shape due to the notch grooves 26a and 27a being formed in them. The width dimension S of the cut grooves 26a and 27a is substantially equal to the effective diameter or valley diameter of the mounting bolt 11.

  The distance between the upper piece 26 and the lower piece 27 is a dimension obtained by adding the thickness of the mounting plate 17 of the hanger 12 to the sum of the reference dimensions (nut thicknesses) of the nuts 19 and 20 as is apparent from FIG. It is said that. However, the distance between the upper piece portion 26 and the lower piece portion 27 is gradually reduced toward the distal end portions 26b and 27b. Then, the tip portions 26b and 27b of the fork-shaped upper piece portion 26 and the lower piece portion 27 slightly warp in opposite directions, and when the clip 25 is attached to the mounting bolt 11, the upper piece portion relatively The first and second nuts 19 and 20 that are in contact with the upper and lower fastening surfaces of the mounting plate 17 are easily sandwiched between the mounting plate 17 and the space between the portion 26 and the lower piece portion 27.

    Next, a method for attaching the clip 25 will be described. When the mounting plate 17 of the hanger 12 is fixed at a predetermined position so that the mounting bolt 11 is inserted through the hole 16 of the mounting plate 17 and is sandwiched between the first and second nuts 19 and 20, the operator can see FIG. As shown, the tip portions 26ab and 27b of the upper piece portion 26 and the lower piece portion 27 are held from the side of the hanger 12, that is, from the right side or the left side as viewed in FIG. The mounting bolt 11 is relatively fitted into the notch grooves 26a and 27a so that the sandwiched first and second nuts 19 and 20 are relatively inserted between the upper piece portion 26 and the lower piece portion 27. It is installed with. At that time, the distance between the top end portion 26 and the bottom piece portion 27 of the clip 25 is slightly smaller than the dimension between the two nuts 19 and 20 sandwiching the mounting plate 17 as described above. The portion 26 and the lower piece portion 27 are forcibly spread, and after the clip 25 is attached to the mounting bolt 11, the restoring force of the spread upper piece portion 26 and the lower piece portion 27 becomes a spring force. Are pressed against the nuts 19 and 20.

  Accordingly, the first and second nuts 19 and 20 tightening the mounting plate 17 of the hanger 12 from the upper and lower tightening surfaces 17a and 17b are rotated in a direction loosened by vibration, in other words, are rotated in a direction away from the mounting plate 17. However, the pinching force between the upper piece portion 26 and the lower piece portion 27 of the clip 25 prevents the mounting bolt 11 from moving in the axial direction, and as a result, no rotation in the direction away from the mounting plate 17 occurs. The two nuts 19 and 20 are not loosened, and the mounting portion 17 of the hanger 12 is held between the first and second nuts 19 and 20. In this way, the nut loosening prevention clip 25 is loosened by pressing the first and second nuts 19 and 20 tightening the mounting plate 17 from above and below by the sandwiching force between the upper piece portion 26 and the lower piece portion 27. The locking edge 29 can be fitted into the thread groove of the mounting bolt 11 at the deepest part of the notch grooves 26a, 27a formed in the upper piece part 26 and the lower piece part 27 and the inner edge part in the vicinity thereof. It is also preferable to prevent the upper piece portion 26 and the lower piece portion 27 from expanding in the axial direction with respect to the mounting bolt 11 by forming.

  In other words, the innermost portion of the notch grooves 26a and 27a formed in the upper piece portion 26 and the lower piece portion 27 of the clip 25 and the inner edge portion in the vicinity thereof can be fitted into the screw groove of the mounting bolt 11. The edge 29 is formed. When the clip 25 is attached so that the attachment bolt 11 is relatively fitted in the notch grooves 26a and 27a formed in the upper piece portion 26 and the lower piece portion 27, the locking edge 29 is provided. And is locked in the axial direction of the mounting bolt 11. Thereby, when the clip 25 is attached to the mounting bolt 11, the upper piece portion 26 and the lower piece portion 27 do not move in the axial direction of the mounting bolt 11, and as a result, the attachment portion 17 of the hanger 12 is sandwiched. The movement of the first and second nuts 19 and 20 fixed in the direction of the mounting bolt axis is prevented, the two nuts 19 and 20 are not loosened, and the mounting portion 17 of the hanger 12 is connected to the first nut 19 and The second nut 20 continues to be firmly held.

  The locking edge 29 formed at the inner edge of the notch grooves 26a and 27a is chamfered at the upper and lower corners at the inner edge of the notch grooves 26a and 27a, and is smaller than the thread pitch of the mounting bolt 11 as shown in FIG. It can be formed by tapering to a thickness. Alternatively, if the upper piece portion 26 and the lower piece portion 27 are formed of a plate material having a thickness slightly smaller than the screw pitch of the mounting bolt 11, the inner edge portions of the cutout grooves 26 a and 27 a themselves become the locking edges 29. Therefore, as shown in FIG. 6, it is not necessary to chamfer the upper and lower corners at the inner edge portion and taper it so as to have a thickness smaller than the screw pitch of the mounting bolt 11. can do.

  As described above, according to the ceiling foundation structure according to the above-described embodiment, the structure includes the nut loosening prevention means for preventing both the first nut or the first and second nuts from loosening. Even if at least the first nut is loosened by vibration and tries to rotate in a direction away from the mounting bolt, the first nut will not loosen, and therefore the hanger will not move. As a result, an equal support load to all the mounting bolts 11 can be maintained, and the initial strength of the ceiling foundation structure can be maintained over a long period of time.

DESCRIPTION OF SYMBOLS 10 Ceiling base structure 11 Mounting bolt 12 Field edge receiving hanger 13 Field edge receiving 14 Field edge 15 Substrate 16 Mounting bolt insertion hole 17 Mounting plate 18 U-shaped part 19, 20 Nut 21a, 21b Cut part 22 First protrusion 23a, 23b Cut portion 24 Second projecting piece 25 Nut loosening prevention clip 26 Upper piece portion 26a Notch groove 27 Lower piece portion 27a Notch groove 29 Locking edge

Claims (4)

It comprises a mounting bolt attached to the building ceiling of the building structure, a hanger attached to the mounting bolt, a field edge supported by the hanger, and a field edge connected to the field edge receiver. The hanger has a plate-like substrate, a mounting plate having an insertion portion projecting substantially perpendicularly from one end of the substrate and allowing the mounting bolt to be inserted, and a field edge receiving fitting formed on the other end side of the substrate And the mounting plate of the hanger is fastened to the lower and upper tightening surfaces of the mounting plate by tightening first and second nuts screwed into the mounting bolts passing through the insertion portion. In the ceiling foundation structure fixed to the mounting bolt,
The ceiling foundation structure includes nut loosening prevention means for preventing looseness of both the first nut or the first and second nuts ;
The nut locking means is composed of a first projecting piece formed by cutting at least one notch from an edge of the mounting plate in the hanger, and the first projecting piece is bent and the A ceiling foundation structure that is pressed against an outer peripheral surface of the first nut that comes into contact with a lower tightening surface to prevent rotation of the first nut .   The nut loosening prevention means includes a second projecting piece formed by cutting at least one notch from the edge of the mounting plate in the hanger having the first projecting piece, and the second projecting piece is bent. The ceiling foundation structure according to claim 1, wherein the ceiling base structure is pressed against an outer peripheral surface of the second nut that comes into contact with the upper tightening surface of the mounting plate to prevent the second nut from rotating. It comprises a mounting bolt attached to the building ceiling of the building structure, a hanger attached to the mounting bolt, a field edge supported by the hanger, and a field edge connected to the field edge receiver. The hanger has a plate-like substrate, a mounting plate having an insertion portion projecting substantially perpendicularly from one end of the substrate and allowing the mounting bolt to be inserted, and a field edge receiving fitting formed on the other end side of the substrate And the mounting plate of the hanger is fastened to the lower and upper tightening surfaces of the mounting plate by tightening first and second nuts screwed into the mounting bolts passing through the insertion portion. In the ceiling foundation structure fixed to the mounting bolt,
The ceiling foundation structure includes nut loosening prevention means for preventing looseness of both the first nut or the first and second nuts;
The nut locking means comprises a nut locking clip that is detachably attached to the mounting bolt, and the nut locking clip comprises an upper piece located at a lower portion of the first nut and a second nut. The upper piece and the lower piece are connected to each other, and the mounting bolt is fitted to the upper piece and the lower piece. A notch is formed,
The ceiling foundation structure in which the notch groove formed in the upper piece portion and the lower piece portion includes a locking edge that can be fitted into a screw groove of the mounting bolt at an inner edge portion thereof. The notch grooves formed in the upper piece portion and the lower piece portion of the nut locking clip respectively extend from the tip edge opposite to the connecting end connected to the connecting piece portion toward the connecting end. The width dimension is approximately equal to the effective diameter of the mounting bolt or slightly larger than the valley diameter, and the upper piece portion and the lower piece portion have a thickness slightly smaller than the pitch of the mounting bolt. The ceiling foundation structure according to claim 3 , wherein the inner edge portion of the notch groove itself forms the locking edge by being formed of a plate material.

Images