JP7693174B2 - Clip nuts and building panels - Google Patents

Description

This application relates to a clip nut for connecting an architectural panel having a stiffening rail embedded in the back side of a precast molded plate to a building structure, and to an architectural panel with the clip nut attached to the stiffening rail.

The applicant has developed an exterior wall panel in which shaped steel material is embedded on the back side of a precast molded plate as an architectural panel that can be used for curtain wall exterior walls of three-story steel-framed houses, and has disclosed this in Patent Document 1. As shown in FIG. 12, the exterior wall panel 1 is a precast molded plate (referred to as a "concrete veneer" in the document) 12 in which a single layer of mesh reinforcing bars 11 is embedded, and a stiffening rail (referred to as a "channel-shaped frame material" in the document) 2 made of hat-shaped steel is attached to the back side of the precast molded plate (referred to as a "concrete veneer" in the document) 12. The stiffening rail 2 is embedded in concrete with its flange portion (the brim of the hat) 21 that protrudes outward welded to the mesh reinforcing bars 11, and its bottom portion (the top surface of the hat) 22 that surrounds the U-shaped groove portion raised above the back side of the precast molded plate 12.

A nut member (referred to as an "insert nut" in the document) 4 for connecting the exterior wall panel 1 to a beam or the like of the building structure is attached in the groove of the stiffening rail 2. This nut member 4 is a high nut with one end closed, and is fixed in advance by welding in the groove of the stiffening rail 2 so that the open end of the screw hole faces the opening 23 formed in the bottom surface 22 of the stiffening rail 2, and the closed end is embedded in concrete. By adopting such a configuration, it is possible to obtain an exterior wall panel 1 that is thin, has excellent strength, and is easy to connect to the building structure.

The applicant also discloses in Patent Document 2 a floor panel having a cross-sectional structure similar to that of the exterior wall panel 1.

JP 2001-295393 A JP 2006-124975 A

In the exterior wall panel 1 described in Patent Document 1, in which a stiffening rail 2 made of hat-shaped steel is embedded on the back side of a precast molded plate, the nut member 4 must be attached to a predetermined position on the stiffening rail 2 or mesh reinforcing bar 11 before concrete is poured into the formwork, but this requires welding work, which is time-consuming. Moreover, it is also necessary to ensure sufficient fixing strength when welding the nut member 4 so that the position or posture of the nut member 4 does not shift when the concrete is poured.

The invention disclosed in this application has been made to improve this situation, and its purpose is to enable anyone to easily and securely attach nut members for connecting architectural panels, such as exterior wall panels and floor panels, which are made by embedding stiffening rails made of hat-shaped steel into concrete veneers or other precast molded panels, to the building frame in the correct position without the need for welding.

In addition, the invention disclosed in this application proposes a practical configuration for a building panel in which such a nut member is attached to a stiffening rail.

In order to achieve the above-mentioned object, the clip nut according to the invention disclosed in this application has a basic configuration comprising a nut member having a female threaded hole, a nut support plate connected at one end to the open end of the female threaded hole so as to be perpendicular to the axis of the nut member, and a clip portion provided at the other end of the nut support plate, the clip portion being positioned on the opposite side of the nut member across the nut support plate and formed so that the clamping piece opens toward the nut member.

In a clip nut with this basic configuration, the nut support plate and the clip portion can be integrally formed by folding back a single thin steel plate having spring elasticity.

The joining portion between the nut member and the nut support plate may be such that a short cylindrical crimping portion protrudes from the seat surface at the open end of the female threaded hole of the nut member, and the crimping portion is inserted into a hole formed in the nut support plate and crimped, or a crimp washer is fitted to join the nut support plate.

The architectural panel to which the clip nut is applied is characterized in that a stiffening rail made of hat-shaped steel is attached to the architectural panel so that its bottom portion is raised from the rear surface of the precast molded plate, rectangular window holes and circular connecting holes are formed at predetermined intervals at predetermined locations on the bottom portion of the stiffening rail, and the clip nut is inserted through the window holes of the stiffening rail into the gap between the bottom portion and the precast molded plate, and the clip portion clamps the opening edge of the window hole, thereby holding the female threaded hole of the nut member facing the connecting hole.

In the architectural panel having this configuration, a short cylindrical crimping portion is provided on the seat surface of the open end of the female threaded hole of the nut member, and the crimping portion is inserted into a hole formed in the nut support plate and crimped, or is connected to the nut support plate by fitting a crimping washer, and the crimping portion of the nut member is fitted into and held in a connecting hole formed in the bottom surface of the stiffening rail.

More preferably, the clip nut is provided with a pressing piece punched out of the nut support plate and bent toward the nut member, and the pressing piece provided on the nut support plate abuts against the rear surface of the precast molded plate, thereby pressing the nut member against the bottom surface of the stiffening rail.

The building panel can also be configured so that the opposite side of the open end of the nut member is held embedded in the precast molded plate.

By using a clip nut configured as described above, anyone can easily and securely attach the nut member to the bottom of the hat steel embedded in the precast molded plate in the correct position without welding or needing special tools.

In addition, by forming a rectangular window hole and a circular connecting hole in the bottom surface of the stiffening rail, inserting a clip nut into the groove of the stiffening rail through the window hole, and clamping the opening edge of the window hole with the clip part of the clip nut, the open end of the nut member can be held with high precision so that it faces the connecting hole of the stiffening rail. Furthermore, the space required to attach the nut member to the stiffening rail can be kept compact.

By using architectural panels constructed in this way, it is possible to significantly improve workability when manufacturing architectural panels and connecting them to the framework.

FIG. 2 is a perspective view of the rear side of a building panel to which a clip nut according to the invention disclosed in the present application is attached. 1A and 1B are perspective views showing the configuration of a clip nut according to a first embodiment of the invention disclosed in the present application, in which FIG. 5A and 5B are perspective views showing a state when the clip nut according to the first embodiment is attached to a stiffening rail, in which FIG. 5A shows the state before attachment and FIG. 5B shows the state after attachment. FIG. 4 is a side view showing a form when the clip nut according to the first embodiment is attached to a stiffening rail. 4 is a cross-sectional view showing a state in which the clip nut according to the first embodiment is attached to a stiffening rail, as viewed from the material axis direction of the stiffening rail. FIG. 1A and 1B are diagrams showing a configuration in which an architectural panel having a clip nut attached thereto according to the first embodiment is connected to a structural body, in which (a) is a longitudinal cross-sectional view and (b) is a front view showing the back surface of the architectural panel as viewed from the structural body side. 5A and 5B are perspective views showing a configuration of a clip nut according to a second embodiment of the invention disclosed in the present application, in which FIG. 5A shows the configuration of the upper surface side and FIG. 5A and 5B are perspective views showing a state when the clip nut according to the second embodiment is attached to a stiffening rail, in which FIG. 5A shows the state before attachment and FIG. 5B shows the state after attachment. FIG. 10 is a side view showing a form when the clip nut according to the second embodiment is attached to a stiffening rail. 10 is a cross-sectional view showing a state in which the clip nut according to the second embodiment is attached to a stiffening rail, as viewed from the material axis direction of the stiffening rail. FIG. FIG. 11 is a vertical cross-sectional view showing a state in which a building panel to which the clip nut according to the second embodiment is attached is connected to a building frame. 1 is a cross-sectional view showing a main part of an exterior wall panel disclosed in Patent Document 1. FIG.

Below, an embodiment of the invention disclosed in this application will be described with reference to the drawings. Note that when describing the relative positions of parts and components and the direction of operation below, the up-down direction (thickness direction) will be specified based on the posture at the manufacturing stage of the architectural panel, that is, when the architectural panel's design side faces down and its back side faces up, a stiffening rail is attached to the back side, and concrete is poured into the formwork in this state. For convenience, the long side direction of the architectural panel will be called the vertical direction (height direction), and the short side direction will be called the horizontal direction (width direction).

In addition, components whose functions or actions are substantially common in multiple embodiments are given the same numerical symbols to simplify duplicated explanations in the embodiments described below. When distinguishing or contrasting a specific component in the embodiment described above with a similar component in the embodiment described below, a capital letter (A, B, etc.) is added to the numerical symbol corresponding to the component, but the basic concept of components with common numerical symbols is common throughout the embodiments.

<Construction panels>
FIG. 1 shows the basic structure of a building panel 10 to which the clip nut according to the invention disclosed in this application is attached. The building panel 10 is a structure in which two stiffening rails 20 made of hat-shaped steel are attached in the long side direction to the back side of a precast molded plate 12 in which a single layer of mesh reinforcing bars 11 is embedded. The stiffening rail 20 is embedded in concrete such that the flange portion 21 protruding outward is welded to the mesh reinforcing bars 11 and the bottom surface portion 22 surrounding the U-shaped groove portion is raised from the back side of the precast molded plate 12. These structures are substantially the same as those of the exterior wall panel 1 described in Patent Document 1. However, in the invention disclosed in this application, in order to attach the clip nut described below to the stiffening rail 20, rectangular window holes 24 and circular connecting holes 25 are formed at predetermined intervals at predetermined positions (for example, near both ends and the middle portion) of the bottom surface portion 22 of the stiffening rail 20. The window holes 24 and the connecting holes 25 are both arranged on the center line in the width direction of the stiffening rail 20. The rectangular window hole 24 is formed with its long side facing the material axis direction of the stiffening rail 20. This window hole 24 is also used as a hanging part when the building panel 10 is hoisted and transported by a crane or the like.

First Embodiment
2 to 6 show the configuration of a clip nut 3A according to the first embodiment of the invention disclosed in this application, and the manner in which it is attached to a stiffening rail 20. The clip nut 3A basically comprises a nut member 40 having a female threaded hole, a nut support plate 5 having one end connected to the open end of the female threaded hole of the nut member 40, and a clip portion 6 provided on the other end of the nut support plate 5.

The nut member 40 in the illustrated embodiment is a hexagonal nut with both axial ends open and of standard or lower height. In this specification, the nut member 40 according to this embodiment, including the standard height, is referred to as a "low nut 41" to distinguish it from the high nut described below. A short cylindrical crimping portion (not shown) protrudes from the seat of this low nut 41.

The nut support plate 5 in the illustrated embodiment is formed of a thin steel plate of approximately equal width having spring elasticity. The width dimension of the thin steel plate is set to be slightly smaller than the short side dimension of the rectangular window hole 24 formed in the stiffening rail 20.

A circular hole (not shown) is formed near one end of the nut support plate 5, and the crimped portion of the low nut 41 is inserted into the hole and crimped or a crimp washer 42 is fitted onto the crimped portion from above the nut support plate 5. This crimping joint connects the vicinity of one end of the nut support plate 5 to the open end of the low nut 41 so as to be perpendicular to its axis. Furthermore, the nut support plate 5 is cut near both side edges of the low nut 41 and bent downward to sandwich the two opposing side surfaces of the low nut 41, forming a rotation stopper 51 for the low nut 41.

The connection between the low nut 41 and the nut support plate 5 can also be achieved by using a type of nut that is sold under the names of clinch nut (self-clinching nut), carley nut, skirted nut, press-fit nut, knurled nut, etc.

The clip portion 6 in the illustrated embodiment is formed integrally with the nut support plate 5 by extending the other end of the thin steel plate that constitutes the nut support plate 5 and folding it back upward. The clamping piece 61 formed by folding back is located on the opposite side of the low nut 41 across the nut support plate 5, and opens toward the low nut 41 side. At the tip of the clamping piece 61, a lip 62 is formed by folding the edge diagonally upward.

In the illustrated embodiment, a pressing piece 52 is provided in the nut support plate 5 near the low nut 41 by punching and bending the nut support plate 5 into a roughly U-shape when viewed from above. The pressing piece 52 extends obliquely downward from the low nut 41 side to the other end of the nut support plate 5, and the extending end is farther away from the nut support plate 5 than the height of the low nut 41.

As shown in Figures 3 to 5, the clip nut 3A configured in this manner is inserted into the gap between the bottom surface 22 of the stiffening rail 20 and the precast molding plate 12, starting with the low nut 41 side, through the rectangular window hole 24 formed in the stiffening rail 20. If the clip nut 3A is advanced in this state, the opening edge of the window hole 24 is clamped by the clip portion 6 and stops when it hits the folded portion of the clip portion 6. At this time, the opening end (crimping portion or crimping washer 42) of the low nut 41 fits exactly into the connecting hole 25 formed in the stiffening rail 20, and is held so that the female threaded hole of the opening end faces. In other words, as shown in Figure 4, the dimension P from the axis of the low nut 41 to the folded portion of the clip portion 6 is set to match the dimension Q from the opening edge of the window hole 24 in the stiffening rail 20 to the center of the connecting hole 25. The pressing piece 52 formed on the nut support plate 5 elastically abuts against the back surface of the precast molding plate 12, and the repulsive force acts to press the lower nut 41 against the bottom surface 22 of the stiffening rail 20.

The architectural panel 10 with the clip nut 3A attached to the stiffening rail 20 in this way is erected on the frame as shown in FIG. 6, for example, and is connected to a roughly groove-shaped architectural panel mounting rail 94 attached to a flange 93 of a steel beam by fastening a hook-shaped architectural panel mounting bracket 91 or the like to a low nut 41 with a bolt 92.

Second Embodiment
7 to 11 show the configuration of a clip nut 3B according to a second embodiment of the invention disclosed in the present application and a mounting form for the stiffening rail 20.

The clip nut 3B according to this embodiment also has, as its basic configuration, a nut member 40, a nut support plate 5 connected near one end to the open end of the female threaded hole of the nut member 40, and a clip portion 6 provided on the other end of the nut support plate 5. However, in this embodiment, a high nut 43 is used for the nut member 40, the opposite side of the open end of which is a closed end. The connection form between the open end of the high nut 43 and the nut support plate 5 can be the same crimping form as in the first embodiment.

This clip nut 3B, which uses a high nut 43 as the nut member 40, is attached to the stiffening rail 20 before concrete is poured on the precast molded plate 12. That is, as shown in Figs. 8 to 10, the high nut 43 is inserted into the groove of the stiffening rail 20 from the window hole 24 of the stiffening rail 20 welded to the mesh reinforcing bar 11 (not shown in Fig. 8) with the high nut 43 side first. When the clip nut 3B is advanced in this state, the opening edge of the window hole 24 is clamped by the clip part 6 and stops when it hits the folded part of the clip part 6. At this time, the open end of the high nut 43 (crimping part or crimping washer 42) fits exactly into the connecting hole 25 formed in the stiffening rail 20, and is held so that the female screw hole of the open end faces. When concrete is poured into the formwork in this state, the closed end of the high nut 43 is held in a state where it is embedded in the precast molded plate 12.

Therefore, in this second embodiment, there is no point in providing the nut support plate 5 with the pressing piece 52 as in the first embodiment. However, for the purpose of standardizing the components, there is no particular problem in using a thin steel plate with the same processing form as in the first embodiment for the nut support plate 5 of the second embodiment.

In this way, the clip nut 3B is attached to the stiffening rail 20 before the concrete is poured, and the architectural panel 10, in which the high nut 43 is partially embedded in the precast molded plate 12, is erected on the framework as shown in FIG. 11 and connected to the framework in exactly the same manner as in the first embodiment.

As explained above with two different embodiments, by using the clip nuts 3A and 3B according to the invention disclosed in this application, anyone can easily and securely attach the nut members 40 (low nuts 41 and high nuts 43) to the bottom surface 22 of the stiffening rail 20 embedded in the precast molded plate 12 in the correct position without welding or requiring special tools. The clip portion 6 has a suitable degree of elasticity, so it can be attached without difficulty even if the plate thickness of the stiffening rail varies slightly.

In addition, by forming a rectangular window hole 24 and a circular connecting hole 25 in the bottom surface 22 of the stiffening rail 20, inserting clip nuts 3A and 3B into the grooves of the stiffening rail 20 through the window hole 24 and clamping the opening edge of the window hole 24 with the clip portion 6, the opening end of the female threaded hole of the nut member 40 can be precisely held facing the connecting hole 25 of the stiffening rail 20, and the space required to attach the nut member 40 to the stiffening rail 20 can be kept compact.

By adopting a building panel 10 configured in this way, it is possible to significantly improve the workability when manufacturing the building panel 10 and connecting it to the building structure.

In particular, the clip nut 3A of the first embodiment having the low nut 41 is attached to the stiffening rail 20 after the stiffening rail 20 is embedded in concrete. Therefore, even if an unforeseen incident occurs at the construction site, such as the nut member 40 (low nut 41) not being placed in the connecting hole 25 used for connecting to the framework, the nut member 40 (low nut 41) being placed in the wrong connecting hole 25, or the attached clip member interfering with other members, the clip nut 3A can be retrofitted or replaced on the spot.

The technical scope of the invention disclosed in this application should not be interpreted as being limited by the illustrated embodiments, but should be interpreted conceptually based on the claims. When implementing the invention disclosed in this application, the shape, structure, material, quantity, joining form, relative positional relationship, etc. of components not specifically specified in the claims may be modified as appropriate within the scope that provides substantially the same or greater effect as the illustrated embodiments.

For example, the nut support plate 5 and the clip portion 6 of the clip nuts 3A and 3B are not limited to being integrally formed from a single thin steel plate, but may be formed by combining two members. In addition, the pressing piece 52 of the clip nut 3A shown in the first embodiment is not limited to being punched into a substantially U-shape, but can be formed by appropriate punching or cutting, or by attaching another elastic member to the nut support plate 5, as long as it exerts an appropriate reaction force toward the precast molded plate 12. If the nut support plate 5 is firmly held along the bottom surface portion 22 of the stiffening rail 20 by the clamping force of the clip portion 6 alone, the pressing piece 52 may not be necessary. In addition, the high nut 43 of the clip nut 3B shown in the second embodiment may be in a form in which the opposite side of the open end is not closed.

The invention disclosed in this application can be widely used in the connection parts of various building components, such as exterior wall panels, floor panels, and other building panels, in which hat-shaped steel beams are embedded in precast molded bodies.

REFERENCE SIGNS LIST 10 Architectural panel 11 Mesh reinforcing bar 12 Precast molded plate 20 Stiffening rail 21 Flange portion 22 Bottom surface portion 24 Window hole 25 Connection hole 3A, 3B Clip nut 40 Nut member 41 Low nut 42 Crimp washer 43 High nut 5 Nut support plate 51 Rotation stopper 52 Pressing piece 6 Clip portion 61 Clamping piece 62 End lip 91 Architectural panel mounting bracket 92 Bolt 93 Steel beam flange 94 Architectural panel mounting rail

Claims (4)

In an architectural panel, a stiffening rail made of hat-shaped steel is attached to the back side of a precast molded plate so that the bottom part of the stiffening rail is raised from the back side of the precast molded plate,
Rectangular window holes and circular connection holes are formed at predetermined intervals at predetermined locations on the bottom surface of the stiffening rail,
The nut member has a female threaded hole, a nut support plate connected at one end to the open end of the female threaded hole so as to be perpendicular to the axis of the nut member, and a clip portion provided at the other end of the nut support plate, the clip portion being located on the opposite side of the nut member across the nut support plate, and a clip nut formed so as to open a clamping piece toward the nut member is inserted into the gap between the bottom portion and the precast molded plate through the window hole of the stiffening rail,
a clip portion clamping an opening edge portion of the window hole, thereby holding the female screw hole of the nut member facing the connecting hole. 2. The building panel according to claim 1 ,
A short cylindrical crimping portion is provided on the seat surface of the opening end of the female threaded hole of the nut member,
The crimping portion is inserted into a hole formed in the nut support plate and crimped, or a crimp washer is fitted to the nut support plate, and the crimping portion is connected to the nut support plate.
a crimping portion of the nut member being fitted into and held in a connecting hole formed in a bottom surface of the stiffening rail. The building panel according to claim 1 or 2 ,
A pressing piece is provided by punching out the nut support plate and bending it toward the nut member,
The architectural panel is characterized in that the nut member is pressed against the bottom portion of the stiffening rail by the pressing piece abutting against the rear surface of the precast molded plate. The building panel according to claim 1, 2 or 3 ,
The nut member is held in a state where the opposite end of the opening is embedded in the precast molded plate.

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