JPH11248611A - Fixing tool for irregular shaped reinforcing steel tensile test machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fixing tool for an irregular shaped reinforcing steel tensile test machine facilitating its detaching after a test. SOLUTION: This fixing tool for an irregular shaped reinforcing steel tensile test machine is formed of a box-shaped frame body 1 having a through hole 3 one side confronting faces 4, 5 of which slant toward a lower center in the central part, and one pair of wedge-shaped fastening members 2, 2' clamping an irregular shaped reinforcing steel from both right and left sides, and inserted into the through hole 3. The fastening members are formed so that the outside tapered faces 6, 7 thereof touching slide on the confronting faces of the through holes 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fixture for deformed reinforcing bars used in a testing machine for tensile strength of deformed reinforcing bars.

[0002]

2. Description of the Related Art FIG. 5 shows a test machine for tensile strength of deformed reinforcing bars (hereinafter referred to as deformed bars) embedded in concrete.
As shown in (a) and (b), the testing machine 31 is attached to the deformed muscle 30.
Through the center through-hole 43 of the tester 31 and placed on the buried surface, the fixing tool 44 is attached to the deformed muscle 30 above the tester 31, and the push-up member 32 of the tester 31 is pushed up by hydraulic pressure or the like to fix the upper surface thereof The test is performed on the tensile strength of the deformed muscle 30 by applying pressure to the fixture 44 and applying a compressive force between the fixture 44 and the buried surface.
In the above testing machine, the proof stress measurement uses a pressure gauge,
The measurement is performed using a load measuring unit having a center through hole incorporated in the testing machine.

[0003] As the conventional fixing device, a fixing device as shown in FIG. 6 is generally known. This fixture has a cylindrical frame 51 (hereinafter referred to as a cylindrical frame) having a truncated conical through-hole 53 formed in the center, and a side surface also formed in a conical shape, and deformed streaks are formed. A pair of wedge-shaped fastening members 56, 57 sandwiched from both left and right sides by semi-cylindrical concave grooves 58, 59
It is composed of

As shown in FIGS. 5 and 6, first, the cylindrical frame 51 is attached to the deformed muscle 30 by attaching
It is inserted through the deformed muscle 30, placed on the upper surface of the testing machine 31,
Next, the fastening members 56 and 57 are applied to desired portions of the deformed muscle 30 from both right and left sides in a sandwiching manner, and the cylindrical frame 5
1 is fitted, and the outer peripheral surfaces of the fastening members 56 and 57 and the inner peripheral surfaces of the through holes are slid in the through holes.

At the time of the test, as shown in FIG. 5 (b), a cylindrical push-up member 32 built in the tester 31 projects from the upper surface of the tester 31 by means of hydraulic pressure or the like, and the cylindrical frame 51 is When the upper surface comes into contact with the lower surface and is pushed up in the A direction, the outer peripheral surfaces of the fastening members 56 and 57 are pressed in the B direction, so that the fixing tool 44 is firmly fixed to the deformed muscle 30, and the pushing up member 32 is further raised By doing so, the fixture 44 and deformed muscle 3
A compressive force is applied between the embedded surfaces of 0, that is, the testing machine 31, and the tensile load of the deformed muscle is measured.

[0006]

In the conventional fixture, after the tensile strength test of the deformed muscle is performed as described above, the push-up member 32 of the testing machine 31 is lowered, and the upper surface of the cylindrical frame 51 is hammered. To remove them from the fastening members 56 and 57, and then remove these fastening members from the deformed muscle 30, but there is a problem that the cylindrical frame 51 cannot be easily removed from the fastening members 56 and 57.

If the fixture 44 cannot be removed from the deformed muscle 30,
Since the testing machine 31 cannot be removed from the deformed muscle 30, the cylindrical frame 5
Although the upper surface of 1 is hit hard, it still does not come off, and there is a case where the deformed muscle 30 is unavoidably cut and the testing machine 31 is removed.
By the way, when a tensile strength test of 20 to 25 t was performed, there was an example in which the fixture did not come off from the deformed muscle unless a load of 6 t was applied. Furthermore, since the fixing tool 44 is detached from the deformed muscle 30 by hitting the upper surface of the cylindrical frame 51 with force, there is also a problem that an impact is applied to the test machine 31 at the moment when the fixing tool is knocked down, thereby damaging the tester 31.

In view of such a point, the present inventor has conducted various studies and found that the inner peripheral surface of the through hole of the cylindrical frame and the outer peripheral surface of the pair of fastening members sliding on it are conical surfaces. Focusing on that the inner peripheral surface of the through-hole and the outer peripheral surface of the fastening member are unlikely to be in close contact with the entire surface, the inner peripheral surface of the through-hole and the outer peripheral surface of the fastening member are in close contact with the entire surface. It has been found that the above problem can be solved by adopting a structure which can operate. Accordingly, an object of the present invention is to provide a deformed muscle tension test fixture which has a fixing function equivalent to that of a conventional fixture and is easily removed after the test.

[0009]

According to the present invention, a fixture for a deformed muscle tensile tester (hereinafter, referred to as a fixture) of the present invention is provided with a through hole in which one opposing surface is inclined toward the lower center at the center. It has a square frame and a pair of wedge-shaped fastening members that are inserted into the through holes while holding the deformed muscle from both left and right sides. In the square frame, one of the opposed surfaces of the through hole is inclined toward the lower center. This inclination angle is usually 5 to 30 degrees, preferably 8 to 12 degrees, and is formed to be substantially the same as the inclination angle of the outer tapered surfaces of the pair of fastening members. Further, one facing surface of the through hole may be a flat surface or a curved surface. The external shape of the square frame is usually formed in a rectangular parallelepiped, but is not limited to this, and may have various shapes such as a circle and an ellipse if it has a rectangular through hole in the center. May be.

The pair of fastening members are formed in the same plane or curved surface as the pair of opposed surfaces of the through hole so that the outer tapered surface can slide on the entire inclined surface of the through hole. Has an angle substantially equal to the inclined surface of the facing surface of the through hole. A groove or a non-slip may be formed on each of the holding surfaces of the deformed muscles in the pair of fastening members, so that the gripping property to the deformed muscles may be improved.
The groove is preferably formed as a semi-cylindrical concave groove or a concave groove having a V-shaped cross section, and a non-slip projection may be provided on a flat holding surface of deformed streaks.

It is preferable that the fastening member is integrally provided with a flange on the upper peripheral side surface, the flange being in contact with the upper surface of the frame. By providing the flange, the frame can be easily removed from the fastening member. That is, by inserting a driver-like insertion member between the flange and the upper surface of the frame,
The frame can be easily removed from the fastening member. For this reason, it is preferable to form an insertion port for the insertion member between the flange and the upper surface of the frame.

It is preferable to form a threaded hole in this flange. With such a configuration,
When the bolt is screwed into the screw hole and fastened when removing from the deformed muscle, the tip of the bolt hits the upper surface of the frame and the fastening member is separated from the frame, so that the frame can be easily removed.

When a concave groove is formed on the holding surface of the deformed muscle, it is preferable to form a plurality of ridges on the inner surface of the concave groove at a lateral interval. The flies are effective for tightening to deformed muscles and usually have a height of 0.5 to 3 mm.
It is preferable that the protrusions are formed at regular intervals of 0.5 to 6 mm with ridges of mm.

[0014]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a fixing device according to an embodiment of the present invention. FIGS. 1A and 1B show an example of the fixing device of the present invention. FIG. 1A is a perspective view of a pair of fastening members, FIG. 1B is a perspective view of a frame, and FIG. It is a perspective view showing other examples. FIG.
FIGS. 4A and 4B show another example of the fixing device of the present invention, in which FIG. 4A is a perspective view of a fastening member, FIG. 4B is a schematic cross-sectional view showing a use state of the fastening member, and FIG. It is a typical sectional view of the fixture of the present invention using the example fastening member. FIG.
FIG. 2 is a schematic diagram showing a use state of the fixture of FIG. 1.

As shown in FIG. 1, the fixing device of the present invention comprises a square frame 1 and a pair of wedge-shaped fastening members 2 and 2 '. A rectangular through-hole 3 is opened in the frame 1,
One of the opposing surfaces 4 and 5 of the through hole 3 is formed in a planar shape inclined toward the lower center. A pair of fastening members 2,
2 'is a wedge-shaped outer surface 6, 7 of which is flat and tapered, and a semi-cylindrical concave groove 8, 9 capable of holding deformed muscles from both left and right sides is formed on the inner surface thereof. In the concave groove, protruding ribs 10 are formed at equal intervals along the inner peripheral surface.

In the fixture of the present invention shown in FIG. 2, one of the opposing surfaces 14, 15 of the through hole 13 of the frame 11 is formed into a curved surface inclined toward the lower center.
The outer tapered surfaces 16 and 17 of a pair of wedge-shaped fastening members 12 and 12 'inserted into the pair are formed to have substantially the same curved surfaces.

In another example of the fastening member shown in FIG.
Flange 1 that contacts upper surface C of frame 1 on its upper peripheral side surface
8 and 18 'are formed integrally, and threaded holes 19 and 19' are respectively formed in the flanges. Bolts 20 and 2 are formed in these screw holes as shown in FIG.
0 'is attached. Further, an insertion port 29 is provided on the lower surface of the flange 28, 28 'of the fastening member shown in FIG.

To attach the fixture of the present invention shown in FIG. 1 to the deformed muscle, the frame 1 is inserted through the deformed muscle 30 as shown in FIG.
Place on top of Next, semi-cylindrical concave grooves 8 and 9 of the fastening members 2 and 2 ′ are clamped from both left and right sides of the fastening members 2 and 2 ′ at desired positions of the deformed streaks 30 on the upper portion of the frame body 1 with the tapered tips directed downward. The fixture is attached to the deformed muscle 30 by inserting the frame body 1 from the tapered distal ends of the fastening members 2 and 2 ′.

As described in detail in [0005], the tensile strength of the deformed muscle is measured by the tester by raising the push-up member 32 of the tester 31 with hydraulic pressure and pressing the lower surface of the frame 1 of the fixture. As a result, the fixture is firmly fixed to the deformed muscle 30, and the tensile strength of the deformed muscle is measured by applying a compressive force between the fixture and the embedded surface of the deformed muscle.

After the measurement, the fixture is removed by using a tester 31.
Of the frame body 1 is lightly hit with a hammer or the like so that the frame body 1
2 ', the upper surface of the frame 1 does not need to be hammered with a hammer or the like, unlike a conventional fixing device.

Furthermore, if the fastening member having the flanges 18 and 18 'shown in FIGS. 3A and 3B is used,
By fastening the bolts 20 and 20 ′ attached to the screw holes 19 and 19 ′, the tip of the bolt pushes the upper surface C of the frame 1, so that the frame 1 can be easily removed. Also,
In the fastening member having the flanges 28 and 28 'shown in FIG. 3C, the frame is easily removed from the fastening member by prying the insertion member into the insertion port 29 provided on the lower surface of the flange. be able to.

[0022]

According to the fixture of the present invention, the frame can be easily removed from the fastening member after the tensile strength of the deformed muscle is measured by the deformed muscle tensile tester, so that the working efficiency is increased. Further, unlike the conventional fixing device, the frame is not strongly hit and deformed, so that the life of the fixing device can be greatly extended. Further, when the fixture is removed from the deformed muscle, the frame does not drop and does not damage the tester by impact.

[Brief description of the drawings]

FIG. 1 shows an example of a fixing device of the present invention, wherein (a) is a perspective view of a fastening member, and (b) is a perspective view of a frame.

FIG. 2 is a perspective view showing another example of the fixing device of the present invention.

FIG. 3 shows another example of the fixing device of the present invention, in which (a)
Is a perspective view of a fastening member, (b) is a schematic cross-sectional view showing a use state of the fixing tool, and (c) is a schematic cross-sectional view of a fixing tool of the present invention using another example of a fastening member. is there.

FIG. 4 is a schematic side view showing a use state of the fixing device of FIG. 1;

FIG. 5 shows a state of use of a conventional fixing device, and (a)
FIG. 3 is a schematic cross-sectional view of a state where the test piece is attached to the deformed muscle, and FIG.

6A and 6B show a conventional fixing device, in which FIG. 6A is a perspective view of a fastening member, and FIG. 6B is a perspective view of a frame.

[Explanation of symbols]

 1,11 Frame 2,2 ', 12,12' Fastening member 3,13 Through hole of frame 4,5; 14,15 One facing surface of through hole 6,7,16,17 Outer taper of fastening member Surfaces 8, 9, semi-cylindrical concave groove of fastening member 10 fusible 18, 18 '; 28, 28' flange 19, 19 'screw hole 20, 20' bolt 29 insertion port 30 deformed streaks 31 testing machine 32 push-up member 33, 33 'Side surface of frame 43 Central through hole of testing machine 44 Fixture 51 Cylindrical frame 56, 57 Fastening member 58, 59 Semi-cylindrical concave groove

Claims (3)

[Claims] 1. A fixture used in a deformed reinforcing bar tensile tester for measuring tensile strength by applying a pressure between a deformed reinforcing bar and a buried surface thereof, wherein one facing surface is directed downward toward the center at the center. A square frame having a through hole that is inclined, and a pair of wedge-shaped fastening members inserted into the through hole while sandwiching the deformed reinforcing bar from both the left and right sides, the fastening member has an outer tapered surface. A fixture for a deformed reinforcing bar tensile tester, wherein the fixture is formed so as to slide in contact with an opposing surface of the through hole. 2. The fixture for a tensile tester of a deformed reinforcing bar according to claim 1, wherein the pair of wedge-shaped fastening members has a groove or a non-slip on a holding surface of the deformed reinforcing bar. 3. The fixture according to claim 1, wherein the pair of wedge-shaped fastening members has a flange formed on an upper portion thereof, the flange being in contact with an upper surface of the frame.