JP2022069943A - Shear strength measurement tool - Google Patents

Abstract

To provide a shear strength measurement tool capable of preventing a bend of a horizontal reinforcement of a joint reinforcement obtained by joining a vertical reinforcement with the horizontal reinforcement in measuring shear strength and aligning a shaft with a central axis of the vertical reinforcement.SOLUTION: A shear strength measurement tool to be attached to a shear strength measurement machine for measuring shear strength of a joint of a joint reinforcement 50 obtained by joining a vertical reinforcement with a horizontal reinforcement 52, includes a main body 11 including a holding part that holds the joint reinforcement 50, a shaft 13 for attaching the main body 11 to the shear strength measurement machine, and a support member 17 that supports the horizontal reinforcement 52 held by the holding part from above in a longitudinal direction. The shaft 13 can be adjusted in position so that a central axis of the vertical reinforcement can be aligned with a central axis of the shaft 13.SELECTED DRAWING: Figure 1

Description

The present invention relates to a jig for measuring shear strength, and more particularly to a jig for measuring shear strength that enables accurate measurement of shear strength.

Shear strength is measured using a shear strength measuring machine, for example, a measuring device such as the "shear measuring machine" disclosed in Patent Document 1, in order to measure the shear strength of the joint portion of the reinforcing bar joined by welding. .. As the reinforcing bar for the test in the case of performing the shear strength test, a joined reinforcing bar in which the vertical reinforcing bar and the horizontal reinforcing bar are generally orthogonal to each other in a cross shape and the intersecting portions thereof are joined by welding is used.

As shown in FIG. 7, the "shear measuring machine" shown in Patent Document 1 is a shear measuring device (shown) for a horizontal bar 52 of a test piece (joined reinforcing bar) 50 formed by welding and joining a vertical bar 51 and a horizontal bar 52. The shear strength of the welded portion is measured by attaching the vertical bar 51 to the test piece fixer 100 via a test piece fixing tool 100 and pulling the vertical bar 51 downward by a tensile means (not shown) provided in the shear measuring device. The test piece fixture 100 includes a main body 101, a shaft 103 that is detachably fixed to a shear measuring device provided on the main body 101, and a mounting portion 105 having a substantially V-shaped cross section on which the horizontal bar 52 is mounted. It is configured in preparation.

Japanese Patent No. 4622923

However, in the case of the test piece fixative 100 as shown in Patent Document 1, the joint portion 55 (see FIGS. 5A to 5C) when the vertical bar 51 is loaded downward by the shear measuring device. ) Was pulled downward, and there was a case where both sides of the joint portion 55 of the lateral bar 52 were bent upward. If the lateral bar 52 is bent, there is a problem that accurate shear strength cannot be measured.

Further, the joined reinforcing bar 50 is a welded portion as shown in FIGS. 5A to 5C, for example, even when reinforcing bars of the same size are used at the welding point where the vertical reinforcing bar 51 and the horizontal reinforcing bar 52 intersect. The width size of the horizontal streaks 52 changes in units of several mm from the central axis of the vertical streaks 51 depending on the degree of welding and the difference between the case of entering between the knots (valley) and the case of riding on the top of the knots (mountain). For example, as shown in FIG. 5B, when the distance from the center of the vertical bar 51 to the side surface of the horizontal bar 52 when the welding point enters between the nodes (valley) is X, the welding point is deep. When it melts (FIG. 5 (a)), the distance becomes X−α, and when the welding point rides on a node (mountain) (FIG. 5 (c)), the distance becomes X + α. Therefore, when the shaft 103 of the test piece fixative 100 is fixed to the shear measuring device, the central axis of the shaft 101 and the central axis of the vertical bar 51 may not match. Further, the central axis of the shaft 101 and the central axis of the vertical bar 51 are displaced due to the difference in the diameter size of the horizontal bar 52. If the central axis of the test piece fixture 100 and the central axis of the vertical bar 51 do not match, there is a problem that the correct shear strength cannot be measured because the downward pulling direction of the vertical bar 51 deviates from the vertical direction. Further, if the downward pulling direction of the vertical bar 51 is deviated, the horizontal bar 52 rotates in response to the vertical bar 51 being pulled downward, which also causes a problem that the correct shear strength cannot be measured. there were.

Therefore, in the present invention, even when the vertical bar is loaded downward by the shear measuring device and the joint is pulled downward, both sides of the joint of the horizontal bar are not bent upward and are in a horizontal state. It is an object of the present invention to provide a jig for measuring shear strength capable of measuring shear strength while maintaining the above.

Another object of the present invention is to provide a shear strength measuring jig capable of measuring shear strength in a state where the shaft of the shear measuring device and the central axis of the vertical bar of the joined reinforcing bar are aligned with each other. do.

In order to solve the above problems, the invention according to claim 1 is for shear strength measurement, which is attached to a shear strength measuring machine to measure the shear strength of the joint portion of the bonded reinforcing bar in which the vertical bar and the horizontal bar are joined by welding. A main body having a holding portion for holding the joined reinforcing bar, a shaft for attaching the main body to the shear strength measuring machine, and the lateral bar of the joined reinforcing bar held by the holding portion in the longitudinal direction. It is characterized in that it is provided with a support member that supports from above.

In order to solve the above problems, the present invention according to claim 2 is characterized in that, in the shear strength measuring jig according to claim 1, the support member is formed longer than the width of the main body. do.

In order to solve the above problems, the present invention according to claim 3 is the jig for measuring shear strength according to claim 1 or 2, in order to position the bonded reinforcing bar on the holding portion on the front surface of the main body. Is provided, and the support member at a position facing the opening is provided with a notch.

In order to solve the above problems, the present invention according to claim 4 is the shear strength measuring jig according to any one of claims 1 to 3, wherein the holding portion faces from the upper side to the lower side. It is characterized in that it is gradually formed narrower.

In order to solve the above problems, the present invention according to claim 5 is the shear strength measuring jig according to claim 4, wherein the holding portion is formed gradually narrower from the upper side to the lower side. The tilted members are detachably arranged.

In order to solve the above problems, the present invention according to claim 6 is the jig for measuring shear strength according to any one of claims 1 to 5, wherein the shaft is the central axis of the vertical bar and the shaft. It is possible to adjust the position so that the central axis of the can be aligned.

According to the shear strength measuring jig according to the present invention, since the support member for supporting the horizontal bar of the joined reinforcing bar held in the holding portion from above in the longitudinal direction is provided, the vertical bar is directed downward by the shear measuring device. Even if it is pulled in, the horizontal streaks are prevented from bending, and there is an effect that accurate shear strength can be measured.

Further, according to the jig for measuring the shear strength according to the present invention, the position of the welded portion can be adjusted so that the central axis of the shaft for mounting on the shear strength measuring machine and the central axis of the vertical streaks can be aligned. Accurate measurement of shear strength is possible even when the length from the central axis of the vertical streaks to the side surfaces of the horizontal streaks differs due to the difference in the degree of penetration (see FIGS. 5 (a) to 5 (c)). In addition, since the position can be adjusted so that the central axis of the shaft and the central axis of the vertical bar can be aligned, the vertical bar can be pulled in the vertical direction, and the rotation of the horizontal bar is suppressed to obtain accurate shear strength. It has the effect of being able to measure.

FIG. 1 is a plan view of an embodiment of a shear strength measuring jig according to the present invention. FIG. 2 is a front view of the shear strength measuring jig shown in FIG. FIG. 3 is a side view of the shear strength measuring jig shown in FIG. 4A is a cross-sectional view taken along the line BB of the jig for measuring shear strength shown in FIG. 1, and FIG. 4B is a cross-sectional view taken along the line AA of the jig for measuring shear strength shown in FIG. 5 (a) is an explanatory view when the welded portion of the joined reinforcing bar is deeply melted, FIG. 5 (b) is an explanatory diagram when the welded portion enters between nodes (valleys), and FIG. 5 (c). Is an explanation when the welded part gets on the top (mountain) of the node. FIG. 6 is a perspective view of the shear strength measuring jig shown in FIG. FIG. 7 is a front view showing a conventional jig for measuring shear strength.

Hereinafter, a preferred embodiment of the shear strength measuring jig according to the present invention will be described in detail with reference to the drawings. 1 is a plan view of an embodiment of a shear strength measuring jig according to the present invention, FIG. 2 is a front view of the shear strength measuring jig shown in FIG. 1, and FIG. 3 is a shear strength measuring jig shown in FIG. It is a side view of a jig.

The illustrated shear strength measuring jig 10 is for measuring the shear strength of the joint portion 55 (see FIGS. 5A to 5C) of the joint reinforcing bar 50 in which the vertical bar 51 and the horizontal bar 52 are joined by welding. It is attached to a shear strength measuring machine (not shown), and as a general rule, a main body 11 provided with a holding portion 15 for holding the joined reinforcing bar 50, a shaft 13 for attaching the main body 11 to the shear strength measuring machine, and It is configured to include a support member 17 that supports the horizontal bar 52 of the joined reinforcing bar 50 held by the holding portion 15 from above in the longitudinal direction.

As shown in FIG. 3, the main body 11 is a metal member having a substantially L-shaped side view, and a shaft 13 is detachably attached to an upper portion thereof. A screw groove is provided on the lower end side of the shaft 13, and the shaft 13 can be attached to the main body 11 by being screwed into a screw hole formed in the top of the main body 11. An opening 14 (see FIG. 2) is provided on the front surface of the main body 11 in order to position the joint reinforcing bar 50 at the holding portion 15. With the support member 17 removed, the vertical bar 51 of the joint reinforcing bar 50 is inserted from the opening 14, and the horizontal bar 52 is placed in the holding portion 15, so that the joined reinforcing bar 50 is placed in the shear strength measuring jig 10. Can be done.

An inclined member 18 having a substantially triangular cross section is arranged at the lower portion of the main body 11 formed in a substantially L shape. The inclined member 18 has a triangular prism shape, is arranged so that the slope side faces inward, and is arranged so as to gradually narrow from the upper side to the lower side. This makes it possible to hold even the joined reinforcing bars 50 having the horizontal bars 52 having different diameter sizes. Further, the inclined member 18 is removable, and by attaching another inclined member 18 having a different size or angle of the inclined surface, it is possible to hold the joined reinforcing bar 50 having the horizontal bars 52 of various diameter sizes. ..

Auxiliary metal fittings 19 and 19 are attached to both sides of the upper left and right sides of the main body 11 by screws 19a and 19a, respectively, and the auxiliary metal fittings 19 and 19 have a predetermined length for fixing the support member 17, respectively. Bolts 16 and 16 are attached. By screwing in the bolts 16 and 16, the support member 17 firmly presses the horizontal bar 52 arranged on the holding portion 15 from above.

The support member 17 is a flat plate-shaped metal plate having a predetermined thickness. The lateral reinforcing bar 52 is firmly supported from above along the longitudinal direction by fixing the support member 17 with the bolts 16 and 16 in a state where the lateral reinforcing bar 52 of the joint reinforcing bar 50 is held by the holding portion 15. As a result, even if the vertical bar 51 is pulled downward, the horizontal bar 52 is prevented from bending, and accurate shear strength can be measured. In the present embodiment, the support member 17 is formed to be longer than the lateral width of the main body 11, so as to surely prevent the lateral streaks 52 from bending. The support member 17 does not necessarily have to be formed longer than the width of the main body 11, and may have the same length as the width of the main body 11, but it is better to press the horizontal bar 52 with the width as long as possible to prevent bending. The effect is high.

The supported member 17 shown in the figure is a flat plate-shaped metal plate having a predetermined thickness, but is not limited to this, and may be, for example, a rectangular parallelepiped or a cube-shaped prismatic metal body. Further, in the case of the horizontal bar 52 having a diameter larger than that of the horizontal bar 52 shown in FIG. 3, when the top of the horizontal bar 52 is higher than the top of the inclined member 18, the mounting posture of the support member 17 is also changed. It can also be arranged in a state where it is tilted 90 ° from the state shown in FIG.

Further, a notch 17a is provided in the lower center on the front side of the support member 17. Specifically, the notch 17a is provided in the support member 17 at a position facing the opening 14 provided on the front side of the main body 11. As a result, the opening 14 and the notch 17a become a continuous space portion, and for example, as shown in FIG. 6, the holding portion 15 is formed even in the case where the upper side of the vertical bar 51 is bent, such as the joined reinforcing bar 50. It is possible to measure the shear strength even with such a joining hand metal 50.

As described above, the shaft 13 is attached to the main body 11 by being screwed into a screw hole formed in the top of the main body 11, but the shaft 13 is attached to the main body 11 from the front side and the back side of the main body 11, respectively, in the direction of the central axis of the shaft 13. The position adjusting screws 12, 12 arranged toward the front can be moved in the front-rear direction. For example, in the present embodiment, as shown in FIGS. 4A to 4C, an inverted T-shaped slide base 13a having an expanded lower side is attached to the lower end side of the shaft 13, and a slide is attached to the main body 11. A T-groove 11a into which the base 13a is inserted is formed, and the slide base 13a is slidably arranged in the T-groove 11a in a direction intersecting the horizontal bar 52 (in the present embodiment, a direction orthogonal to the horizontal streak 52). Then, with the slide base 13a inserted into the T-groove 11a, the shaft 13 is screwed to the slide base 13a, and both sides of the T-groove 11a are closed with a fixing member (not shown) from the front-rear direction of the slide base 13a, and the position adjusting screw 12 , 12 enables relative movement of the shaft 13 and the main body 11, and by adjusting the fixed positions of the position adjusting screws 12 and 12 on the front side and the back side, the central axis of the shaft 13 is directed toward the front. It can be adjusted in the front-back direction. This makes it possible to match the central axis of the vertical bar 51 arranged in the holding portion 15 with the central axis of the shaft 13. By matching the central axis of the vertical bar 51 with the central axis of the shaft 13, for example, when the length from the central axis of the vertical bar 51 to the side surface of the horizontal bar 52 differs due to the difference in the degree of penetration of the welded portion of the joined reinforcing bar 50. Accurate measurement of shear strength is possible even in (see FIGS. 5A to 5C). Further, since the central axis of the shaft 13 and the central axis of the vertical bar 51 can be aligned with each other, the vertical bar 51 can be pulled in in the vertical direction, and the rotation of the horizontal bar 52 can be suppressed to measure the accurate shear strength. Is possible. The position adjusting structure for aligning the central axis of the vertical bar 51 with the central axis of the shaft 13 is an example, and the position adjusting structure is not limited to this, and an appropriate structure can be adopted.

As described above, the preferred embodiment of the jig for measuring the shear strength according to the present invention has been described, but the present invention is not limited to the above-mentioned embodiment, and the present invention described in the claims. Needless to say, various modifications and changes are possible within the scope of the gist.

10 Shear strength measurement jig 11 Main body 11a T groove 12 Position adjustment screw 13 Shaft 13a Slide base 14 Opening 15 Holding part 16 Bolt 17 Support member 18 Inclined member 19 Auxiliary metal fittings 19a Screw 50 Joint reinforcing bar 51 Vertical bar 52 Horizontal bar

Claims (6)

A jig for measuring shear strength that is attached to a shear strength measuring machine to measure the shear strength of the joint of the jointed reinforcing bars that are joined by welding the vertical and horizontal bars.
A main body provided with a holding portion for holding the joined reinforcing bar,
A shaft for attaching the main body to the shear strength measuring machine,
A support member that supports the horizontal bar of the joined reinforcing bar held by the holding portion from above in the longitudinal direction, and
A jig for measuring shear strength, which is characterized by being equipped with. In the shear strength measuring jig according to claim 1,
The support member is a jig for measuring shear strength, characterized in that it is formed longer than the width of the main body. In the shear strength measuring jig according to claim 1 or 2.
An opening for locating the joint reinforcing bar in the holding portion is provided on the front surface of the main body.
A jig for measuring shear strength, characterized in that a notch is provided in the support member at a position facing the opening. In the shear strength measuring jig according to any one of claims 1 to 3.
The holding portion is a jig for measuring shear strength, characterized in that the holding portion is formed gradually narrower from the upper side to the lower side. In the jig for measuring shear strength according to claim 4,
The holding portion is a jig for measuring shear strength, characterized in that inclined members formed gradually narrower from the upper side to the lower side are detachably arranged. In the shear strength measuring jig according to any one of claims 1 to 5.
The shaft is a jig for measuring shear strength, characterized in that the position of the shaft can be adjusted so that the central axis of the vertical streak and the central axis of the shaft can be aligned with each other.

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