JPH0119020B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a structure for attaching panels constituting the outer wall of a building to a steel beam.

Conventionally, in order to attach panels that make up wall slabs, such as precast concrete slabs, to steel beams,
The panel is provided with a bolt that protrudes from its lower end and has a thread groove on its entire circumference, and a nut that is screwed onto the bolt, and a joint metal fitting that has a hole that can receive the bolt is fixed to the steel beam. ing.

According to the conventional mounting structure, the panel is attached to the steel beam with the bolts being received in the holes of the metal fittings and the nuts screwed onto the bolts being engaged with the metal fittings. As a result, when elastic deformation occurs in the structure due to wind pressure or seismic force acting on the building, the panel follows the elastic deformation and makes a tilting movement using the contact point between the nut and the joint hardware as a fulcrum. be able to.

By the way, when attaching a panel to a steel beam, while the panel is suspended by a crane and lowered, the worker on the steel beam moves the panel back and forth, left and right, and removes the bolts protruding from the bottom edge of the panel. This is done by positioning the bolt directly above the hole provided in the joint hardware, and then inserting the bolt into the hole.

However, when positioning, it is difficult for the worker to see the tip of the bolt, and the angle between the line of sight and the axis of the bolt becomes large, so trial and error must be repeated many times. For this reason, positioning takes a lot of time, which hinders the efficiency of the installation work.

Further, when the tilting movement occurs in the panel, the bolt supporting the panel comes into contact with the hole wall, and a large bending stress is applied to the bolt. However, a bolt having thread grooves on its entire circumference has inferior bending strength compared to a bar made of the same material and having the same outer diameter. Therefore, in order to obtain the same bending strength with a material made of the same material as the bar, there is a drawback that the diameter must be larger than that of the bar.

Furthermore, in the conventional mounting structure, when the tilting movement occurs in the panel and the bolt moves in the hole in its axial direction, the thread of the bolt catches on the edge of the hole to prevent the movement; There is also the problem that unpleasant noises are generated.

Furthermore, when increasing the diameter of the bolt to increase its strength, in order to increase the adhesion strength of the bolt to the panel in proportion to the increase in strength,
The diameter and length of the anchor bolt connected to the bolt and embedded in the panel must also be increased. However, an increase in the diameter and length of the anchor bolt leads to an increase in the thickness of the bolt and the part that protrudes inward of the panel in which the anchor bolt is embedded. There is a problem in that it is not always possible to increase the thickness of the protrusion.

Therefore, it is an object of the present invention to improve the efficiency of the work of attaching panels to steel beams and to solve the above-mentioned conventional problems.

The structure for attaching panels to steel beams according to the present invention is as follows:
An embedded metal fitting embedded in the panel that defines a space that opens on the inner side of the panel and opens downward through a hole, a long nut fixed perpendicularly to a joint metal fitting fixed to a steel beam, and the long nut. and a bolt threaded into the panel, and the panel is attached to the steel beam with the long nut being tiltably received in the hole and the upper end of the bolt abutting the embedded metal fitting. shall be.

According to the present invention, while the panel is suspended and lowered, the positions of long nuts and bolts can be confirmed from the open end of the space through the hole, and thereby the position of the panel with respect to the steel beam can be confirmed. It can be done easily and in a short time.

In addition, since the bolt is screwed into a long nut, the diameter of the bolt can be substantially increased, and a bar material of the same material and the same outer diameter as the bolt can be used without increasing the diameter. The bending strength can be the same or higher, and the tilting movement of the panel is not impeded. Furthermore, when increasing the diameter of the bolt to increase its strength, there is no need to increase the thickness of the protruding portion as in the past, and there is no problem with finishing work.

The features of the invention will become clearer from the following description of the illustrated embodiments.

FIG. 1 shows a panel 10 made of precast concrete slab attached at its upper and lower ends to an upper steel beam 12 and a lower steel beam 14, respectively, which extend laterally parallel to the panel 10. ing.

At the lower end of the panel 10, as shown in detail in FIGS. 2 and 3, there is a box-shaped embedded metal fitting 16 with open sides and a hole in the lower surface, and a steel rod fixed above it. Retainer 1 consisting of
7 and panel 1 is buried by the embedded metal fittings.
A space 20 is defined that is open on the inner surface 10a of the hole 10 and opens downward through the hole 18. The embedded hardware 16 is embedded in two locations that protrude inward from the panel 10 and are thicker than other parts of the panel 10, and are spaced apart in a direction perpendicular to the thickness direction of the panel 10. It is located.

On the other hand, the lower steel beam 14 has an upper flange 14.
An H-shaped joint metal fitting 22 is placed on each embedded metal fitting 16 on a.
Correspondingly, it partially protrudes toward the panel 10 and is fixed at right angles to the lower steel beam 14. Further, near the protruding end of the joint hardware 22, there are provided a long nut 24 vertically fixed to the upper flange 22a of the joint hardware 22, and a bolt 26 screwed into the long nut.

The panel 10 is attached to the lower steel beam 14 with the long nuts 24 received in the holes 18 at the lower end thereof and the upper ends of the heads of the bolts 26 abutting the upper surfaces of the metal fittings 16 within the spaces 20. Level adjustment of the panel is accomplished by inserting a tool such as a spanner or wrench through the open end of the metal fitting 16 and turning the bolt 26 in the space 20.

Furthermore, although the upper end of the panel 10 is not shown,
It is attached to the upper steel beam 12 by known means so as to restrict its movement in the thickness direction. Therefore, most of the weight of the panel 10 is the embedded hardware 1.
6 through the bolts 26 that abut the lower steel beam 14
is loaded. In addition, the upper and lower steel beams 1
2 and 14 undergoes elastic deformation due to the action of wind pressure or seismic force, the panel 10
It is possible to perform a tilting movement following the elastic deformation within the range of the tilt angle when the long nut 24 comes into contact with the inner surface of the washer 28, which will be described later, using the contact point between the washer 28 and the embedded metal fitting 16 as a fulcrum.

In the illustrated example, in order to reduce the frictional force between the inner wall surface of the washer 28 and the outer circumferential surface of the long nut 24 when the panel 10 is tilted, a cylindrical slide is fitted to the long nut 24 with some play. material 27 is arranged. In addition, the panel 10 is attached to the lower steel beam 1
4, a washer 28 having an inner diameter smaller than the diameter of the hole 18 is inserted into the space 20 in order to position the panel 10 front to back and left and right at the same level and to hold the positioned panel 10 in a fixed position. It surrounds the long nut 24 and is fixed to the embedded metal fitting 16 at its lower surface. However, the inner diameter of the washer 28 is set to allow tilting movement of the panel 10.

Instead of the illustrated example in which the embedded hardware 16 is provided at the lower end of the panel 10, it may be provided at the upper end of the panel 10, as shown in FIG. 4, or at another location between the upper and lower ends.

According to the present invention, the embedded hardware provided in the panel opens on the inner surface of the panel and opens downward through the hole, so the panel suspended from the crane is lowered and the long nut is received in the hole. When attaching the panel to a steel beam, the long nuts and bolts can be seen below and positioned directly above the holes. Therefore, the positioning can be performed easily and in a short time without requiring a long time as in the conventional method, and the efficiency of the work of attaching the panel to the steel beam can be significantly improved.

Further, according to the present invention, since the bolts supporting the panel are screwed into the long nuts and integrated, the diameter of the bolts is substantially equal to the outer diameter of the long nuts, compared to the case where only the bolts are used. Its strength can be increased. Therefore, without increasing the diameter of the bolt, it is possible to obtain a bending strength equal to or greater than that of a bar made of the same material and having the same outer diameter.

Furthermore, since the bolts are attached to the beam side, even if the diameter of the bolts needs to be increased, this can be done without increasing the thickness of the projecting portion of the panel as in the conventional case. Furthermore, when the panel tilts, the hole of the embedded metal moves relative to the long nut, so no catch occurs between the hole edge and the long nut, and the noise caused by the catch is prevented. be able to.

[Brief explanation of drawings]

Figure 1 is a vertical cross-sectional view of the panel and steel beam, schematically showing the state in which the panel is attached to the steel beam, Figure 2 is a partially enlarged vertical cross-sectional view showing the structure for attaching the panel to the steel beam, and Figure 3 is a vertical cross-sectional view of the panel and the steel beam. FIG. 2 is a partial vertical cross-sectional view taken along line 3--3, and FIG. 4 is a longitudinal cross-sectional view schematically illustrating another embodiment. 10: panel, 12, 14: steel beam, 16: embedded hardware, 18: hole, 20: space, 22: joint hardware, 24: long nut, 26: bolt.

Claims (1)

[Scope of Claims] 1. A structure for attaching a panel to a steel beam, comprising an embedded metal fitting that is embedded in the panel and defines a space that is open on the inner surface of the panel and opens downward through a hole. , the panel includes a long nut fixed perpendicularly to a joint hardware fixed to the steel beam, and a bolt threaded onto the long nut; the long nut is tiltably received in the hole; A panel mounting structure in which the upper end of a bolt is attached to the steel beam with the upper end of the bolt abutting the embedded metal fitting. 2. The panel mounting structure according to claim 1, wherein the embedded hardware is provided at the lower end of the panel. 3. The panel mounting structure according to claim 1, wherein the embedded hardware is provided at the upper end of the panel.