JPS6227867Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is used for shear testing of welded parts of cross-connected reinforcing bars, where the first reinforcing bar and the second reinforcing bar intersect at a certain inclination angle and the intersection is welded. This relates to a jig for shear testing of cross-connected reinforcing bar welds.

For example, when forming a flat slab, precast concrete plates are laid,
A post-cast concrete layer is placed on top of this, and the pre-cast concrete plate and post-cast concrete layer are constructed using a reinforcing bar truss whose lower part is embedded in the pre-cast concrete plate and whose upper part protrudes. They are connected by being embedded within the concrete layer.

For example, as shown in FIG. 1, the reinforcing bar truss 1 consists of two bottom reinforcements 2 on the lower side and one top reinforcement 3 on the upper side.
It has a structure in which the two are connected by a lattice muscle 4. The lattice reinforcement 4 and the lower end reinforcement 2 or the top reinforcement 3 are connected by welding their mutual contact portions.

By the way, in the flat slab using precast concrete plates as mentioned above, the precast concrete plate and the post-cast concrete layer are connected by the reinforcing bar truss 1, so the strength calculation is not done as a composite of two layers, but as a single layer. Can be easily done in layers.

The reason why it can be treated as one layer in this way is that each welded part 5 of the truss 1 has sufficient strength.

The quality of the welded part 5 of the truss 1 can be inspected by conducting a shear test, but it is possible to check the quality of the welded part 5 of the truss 1 by performing a shear test. Since it is welded, it has the disadvantage that it is difficult to perform a shear test on the welded portion 5.

The purpose of the present invention is to provide a cross-connected reinforcing bar shear test jig that can easily perform a shear test on a welded part of a cross-connected reinforcing bar in which a first reinforcing bar and a second reinforcing bar are welded in an intersecting state. It is on offer.

The present invention provides a jig for shear testing of a welded part of cross-connected reinforcing bars in which a first reinforcing bar and a second reinforcing bar are welded in an intersecting state. The reinforcing bar holder includes a folded plate having a structure in which an upper folded part serves as a reinforcing bar supporting part, into which the first reinforcing bar is inserted and supported, and the reinforcing bar supporting part supports the first reinforcing bar. The reinforcing bar is provided in an inclined state so that it can be supported in a direction inclined with respect to the vertical direction, and a reinforcing bar protrusion window is provided in the center of the reinforcing bar support part to make the second reinforcing bar protrude in the vertical direction. The lower part has a structure in which a long hole for connection is provided in a direction crossing the vertical direction, and the testing machine mounting member is attached to the folded plate with a connecting bolt passed through the long hole of the folded plate. It is characterized by being connected.

Embodiments of the present invention will be described in detail below with reference to the drawings. As shown in FIGS. 2 to 5, the cross-connected reinforcing bar welded part shear test jig of this embodiment includes a reinforcing bar holder 6 and a testing machine mounting member 7 connected to the reinforcing bar holder 6.
It consists of. The reinforcing bar holder 6 consists of an inverted U-shaped folding plate 8 made of steel and a spacer 9 made of steel inserted therein. The upper folded part of the folded plate 8 is a reinforcing bar support part 8A.
6 and 7, which is a part of the reinforcing bar truss 1.
A first reinforcing bar 11 (for example, a portion corresponding to a top bar or a bottom bar) 11 is inserted and supported. This reinforcing bar support portion 8A is the first reinforcing bar 1
1 is provided in an inclined state so that it can support it in an inclined direction with respect to the vertical direction. A reinforcing bar protrusion window 8B is provided at the center of the reinforcing bar support portion 8A to allow the second reinforcing bar (for example, a portion corresponding to a lattice bar) 12 of the cross-connected reinforcing bars 10 to protrude in the vertical direction. After setting the cross-connected reinforcing bars 10 as described above from the gaps between the folded plates 8, spacers 9 are inserted into these gaps, and bolts 13 passing through the folded plates 8 and the spacers 9 are attached to them. These folding plates 8 and spacers 9 are tightened together with screwed nuts 14 to prevent deformation or the like. A long connecting hole 15 is formed in the lower part of the folding plate 8 in a direction crossing the vertical direction. The upper part of the testing machine mounting member 7 has a bifurcated part 7A, and the lower part of the folding plate 8 is inserted between the parts, and the folding plate 8 is passed through the folding plate 8.
The folding plate 8 and the testing machine mounting member 7 are connected by a connecting bolt 16 passing through a long connecting hole 15 and a nut 17 screwed into the connecting bolt 16.

Such a jig for shear test of cross-connected reinforcing bar welds is constructed by attaching the first reinforcing bar 11 to one side of the testing machine with the cross-connecting reinforcing bars 10 set as shown in the figure, and attaching the testing machine mounting member 7 to the testing machine. Attach it to the other side of the
In this state, the axis of the second reinforcing bar 12 and the connecting bolt 1
Set the position of the connecting bolt 16 in the long hole 15 so that the line connecting the bolts 17 is aligned vertically, and
is tightened, and tension is applied between the second reinforcing bar 12 and the testing machine mounting member 7 by the testing machine to cross-connect the reinforcing bar 10.
Perform a shear test on the welded part 5. In this case, the reinforcing bar support portion 8A on the upper part of the folding plate 8 is inclined, and the folding plate 8 is connected to the testing machine mounting member 7 through the elongated hole 15, so that the second The reinforcing bar 12 can be easily set along its axis in the vertical direction where tension is applied, and the shear test can be easily performed with the correct posture.

Note that the spacer 9 may be omitted depending on the case.

As explained above, the cross-connected reinforcing bar welded part shear test jig according to the present invention includes a reinforcing bar support part that supports the first reinforcing bar of the cross-connected reinforcing bars, which is provided in an inclined state on the upper part of the folded plate of the reinforcing bar holder, A reinforcing bar protrusion window is provided in the center of this reinforcing bar support part so that the second reinforcing bar of the cross-connected reinforcing bar protrudes from this window, and a long connecting hole is provided in the folding plate in a direction that intersects with the vertical direction. Using this structure, the test machine mounting member is connected to the folding plate using connecting bolts, so
Even if the first reinforcing bar and the second reinforcing bar are connected in an inclined state, by using these inclined reinforcing bar supports and connecting long holes, the second reinforcing bar can be oriented vertically and along its axis. It can be easily set so that a tensile force is applied to it, and shear tests can be easily carried out even with irregularly shaped cross-connected reinforcing bars. Furthermore, since the present invention uses folded plates, the cross-connecting reinforcing bars can be inserted and set easily by utilizing the gaps.

[Brief description of the drawings]

Figure 1 is a perspective view of the reinforcing bar truss, Figures 2 and 3
The figure is a front view and a vertical cross-sectional view of an embodiment of the jig according to the present invention in use, and FIGS. 4 and 5 are front views and vertical cross-sectional views of the jig shown in FIGS. 2 and 3. , 6 and 7 are front and side views of cross-connected reinforcing bars. 1...Reinforcing bar truss, 2...Bottom reinforcement, 3...Top reinforcement, 5...Welding part, 6...Reinforcing bar holder, 7...
...Testing machine mounting member, 7A...Bifurcated part, 8...Folding plate, 8A...Reinforcement support part, 8B...Reinforcement bar protrusion window, 9...Spacer, 10...Cross connection reinforcing bar, 1
1...First reinforcing bar, 12...Second reinforcing bar, 13...
... Bolt, 14 ... Nut, 15 ... Long hole for connection, 16 ... Connection bolt, 17 ... Nut.

Claims (1)

[Scope of utility model registration request] A jig for a shear test of a welded part of a cross-connected reinforcing bar in which a first reinforcing bar and a second reinforcing bar are welded in an intersecting state, comprising a reinforcing bar holder and a testing machine mounting member connected to the reinforcing bar holder, The upper folded part of the holder serves as a reinforcing bar support part, and the above-mentioned first part is attached thereto.
a folding plate having a structure in which reinforcing bars are inserted and supported, the reinforcing bar support part is provided in an inclined state so as to support the first reinforcing bars in a direction inclined with respect to the vertical direction, and the reinforcing bar supports A reinforcing bar protrusion window is provided in the center of the part to make the second reinforcing bar protrude in the vertical direction, and a long connecting hole is provided in the lower part of the folding plate in a direction intersecting the vertical direction. A jig for shear testing of cross-connected reinforcing bar welds, wherein the tester mounting member is connected to the folding plate by a connecting bolt passed through the elongated hole of the folding plate.