JPS6029524Y2 - Three-dimensional truss joint hardware - Google Patents

Description

[Detailed description of the invention] The present invention is designed for three-dimensional trusses, more specifically, for three-dimensional trusses, which are used when constructing reinforced concrete deck slabs, and for plane trusses that are arranged in an inclined manner. The present invention relates to a joint hardware for connecting a joint with a connecting member disposed laterally.

Reinforced concrete floor slabs generally involve erecting supports on the existing floor slabs on the lower floor, placing and supporting formwork on the supports, placing reinforcement on the formwork, and then pouring concrete. It will be constructed by.

According to this conventional construction method, the shoring cannot be removed until a certain period of time has elapsed after the concrete is placed, at least until the slab has enough strength to support itself, and as a result, the shoring can become stuck. If finishing work cannot be carried out on the lower floor and one attempts to do so, the safety of the work cannot be guaranteed and the efficiency of the work will be extremely poor.

In view of the above, the present applicant has constructed a plurality of plane trusses, each consisting of an upper chord member, a lower chord member, and a lattice arranged between them, so that the upper chord members and lower chord members of adjacent planar trusses are close to each other and parallel to each other. arranged at an angle to
The planar truss is joined by upper and lower connecting members arranged in a direction orthogonal to the upper and lower chord members so as to pass through the intersections of the upper and lower chord members with the lattice, respectively, to form a plate-shaped three-dimensional truss. concrete forming, attaching formwork to the underside of the three-dimensional truss, placing the form-supporting three-dimensional truss on the upper end of a beam or wall of a building, and then pouring concrete slabs. We have developed a method for constructing floor slabs, and a separate patent application has been filed for this method.

The object of the present invention is to provide a joint hardware that can efficiently assemble a three-dimensional truss used when constructing concrete deck slabs as described above.

By the way, when assembling the above-mentioned three-dimensional truss, there are two cases: one case in which one deformed reinforcing bar is arranged at each intersection point and each connecting member, and the case in which two deformed reinforcing bars with a smaller diameter are arranged. However, the present invention relates to a joint hardware that connects the connecting material and the chord material when two deformed reinforcing bars are arranged as connecting members, as in the latter case, and a hole for inserting the bolt is placed in the center. The two receivers include a metal fitting, a bolt inserted into the hole, and a nut to which the bolt is screwed, and two upper chord members and two upper tie members or two lower chord members and two lower chord members. The connecting member is characterized in that the two receivers are configured to be sandwiched and connected by metal fittings.

This will be explained below based on a specific example.

Three-dimensional truss 1 to be used for joint hardware of the present invention
0, as shown in FIG. 11, 11 and the lower chord members 12 and 12 are arranged at an angle so that they are close to each other and parallel to each other, and on the other hand, the upper chord member 11 and the lattice 13 of each plane truss 14, and the lower chord member 12 and the lattice 13, respectively. 2 so as to pass through the intersection
The two upper connecting members 15 and the two child connecting members 16 are arranged in the lateral direction of the plane truss, that is, in the direction perpendicular to each chord member, and at the joint part 17, each connecting member 15, 16 and the two child connecting members 16 are arranged in the horizontal direction of the plane truss, that is, in the direction orthogonal to each chord member. It is made by combining one and the other.

In this case, it is also possible to join the joint parts by welding, but since the space truss is deformed by welding heat, it is necessary to correct the deformation, and the workability is not necessarily improved.

Also, for example, it is conceivable to install stud bolts in advance in the connecting member and use these stud bolts to tighten a metal fitting with bent ends to the adjacent chord members, but it is difficult to install stud bolts. increases, resulting in a higher unit price.

Therefore, the present invention solves the inconveniences that would occur if the connection method uses welding or stud bolts by connecting the connection portions using joint hardware described below.

As shown in FIGS. 2 to 5, the joint hardware of the present invention has two receivers, a metal fitting 20 and 21, and a bolt 2 that is inserted into bolt insertion holes 22 and 22 provided in the metal fitting.
3. A nut 24 is screwed onto this bolt 23.

The metal fittings 20 and 21 of the receiver have substantially the same shape and have a hole 22 in the center, and both ends 20a and 21a are bent to form a bottom shape.

By providing this bent end, it is possible to prevent the plane truss and the connecting member from shifting, so this shape is preferable.

In addition, what is shown is upper chord members 11, 11 and upper tie members 15.
15, but the lower chord material 12
．． The joint hardware for joining 12 and the child connecting members 16 and 16 is, for example, the joint hardware used in the form in which the lattices 13, 13 are inclined upward in FIG. can be used.

The metal fittings 20 and 21 of the receiver have a rectangular planar shape, but may have any other shape such as a square.

When using the joint hardware of the present invention constructed as described above, the bracket 20 is placed so that the ends 20 at 20a are opposed to the two upper chord members 11, 11, and the two upper chord members 1
5.15 The receiver is attached to the metal fitting 21 on the lower side of the metal fitting 20, and the said receiver is in a direction perpendicular to the metal fitting 20, and moreover, the end portion 21at21a abuts against the upper binding material, and both the receivers are connected to the holes 22, 22 of the metal fittings 20, 21. A bolt 23 is inserted into the hole, a washer is applied as necessary, and a nut 24 is tightened to connect the screws.

As a result of this connection, the bolt 23 is located in the space surrounded by the two top chord members and the two top tie members, so the receiver is attached to the metal fitting 20.
．． 21, an equal tightening force is applied to each member.

The connection between the lower chord member 12.12 and the child connecting member 16.16 is exactly the same.

In the above example, the joint hardware is used to connect two upper chord members arranged on both sides of the bolt, but for example, the joint hardware located at the outermost side of the three-dimensional truss has the upper chord arranged only on one side of the bolt.

In this case, it is possible to use the same joint metal fittings as long as a suitable member is placed as a spacer on the side where the upper chord member is not present.

According to the joint hardware of the present invention configured as described above,
The two receivers can be used by simply inserting the bolts into the metal fittings and tightening the nuts onto the bolts.
The two lower chord members and the two child connecting members can be joined together, and since the joining is essentially a rigid joint, not only does it not require specialized workers, but the finishing accuracy is also high.

Moreover, the brackets and metal fittings can be mass-produced by press molding.
It is possible to keep the unit price low.

[Brief explanation of the drawing]

Figure 1 is a perspective view showing an example of a three-dimensional truss to which the joint hardware of the present invention is used, Figure 2 is a perspective view of the joint hardware of the present invention, Figure 3 is a plan view of the same, and Figure 4 is the same as that shown in Figure 3. IV
-IV line sectional view, and FIG. 5 is a sectional view taken along the ■-■ line in FIG. 10: Three-dimensional truss, 11: Upper chord member, 12: Lower chord member, 13
: Lattice, 14: Plane truss, 15: Advance binding material, 16:
Child connecting material, 20, 21: Receptacle is metal fitting, 22: Hole, 23: Bolt, 24: Nut.

Claims (1)

[Scope of utility model registration request] A plurality of planar trusses, each consisting of an upper chord member, a lower chord member, and a lattice arranged between them, are arranged at an angle so that the upper chord members and lower chord members of adjacent planar trusses are close to each other and parallel to each other, and The planar truss is connected with two upper ties and two lower ties at each intersection, which are arranged perpendicularly to the upper and lower chords so as to pass through the intersections of the upper and lower chords with the lattice. A joint metal fitting for forming a three-dimensional truss, the two receivers having a hole in the center for inserting a bolt, consisting of a metal fitting, a bolt to be inserted into the hole, and a nut to be screwed into the bolt. A joint hardware for a three-dimensional truss, which is configured to connect two upper chord members and two upper connecting members or two lower chord members and two lower connecting members, respectively, by sandwiching the two supports with metal fittings.