JPH0633051U - Jig for compression test - Google Patents

Abstract

(57) [Abstract] [Purpose] For an inexpensive compression test that can easily measure the compressive strength of concrete, mortar, etc. using a tensile tester and accurately measure the applied load to the test body and the displacement of the test body without error. Provide jig. [Structure] Guide rods 2a and 2b extending in opposite directions are provided so as to project from pressure plates 1a and 1b facing each other, and both pressure plates 1a and 1b are guided to the guide rod 2 of the other side.
It is provided so as to be movable in opposite directions with b and 2a as guides. Connecting means 3a, 3b to the chuck portion of the tensile tester are provided at the extension side end portions of both guide rods 2a, 2b, and the test piece O sandwiched between both pressure plates 1a, 1b is pulled by the tensile tester. Allows compression by actuation. A load cell such as a load cell is provided on one of the connecting means 3b so that the applied load can be directly measured. A displacement gauge 5 is provided on either one of the pressure plates 1a and 1b so that the displacement of the sample O due to compression can be measured.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a compression test jig for easily measuring the compressive strength of concrete, mortar, etc. by using a tensile tester for measuring the strength of steel etc.

[0002]

[Prior art]

 Conventionally, tensile testers, compression testers, etc. have been used as testers for measuring the strength of steel materials, concrete, mortar, etc., but depending on the purpose of use, either one of the above testers can be used as a factory. It is generally installed and used in such places.

For example, a tensile tester as illustrated in FIGS. 8 and 9 is installed and used for the purpose of measuring the tensile strength of a steel material.

This tensile tester (K) is provided with chuck parts (50a) (50b) facing each other vertically, and a test piece for tensile test can be chucked by operating the operation levers (51) (51), respectively. It is like this. The upper chuck part (50a) is connected downward to the horizontal frame (52) which is horizontally mounted on the upper ends of the support columns (53) on both sides. Further, the lower chuck part (50b) is connected to a cylinder mechanism (54), which is provided inside the main body part (55) by hydraulic pressure or the like, and is supported upward, and is operated downward by the cylinder mechanism (54). It is towed and moved to apply a tensile load to the specimen.

However, when the tensile tester (K) as described above is installed, even if it becomes necessary to newly measure the compressive strength of the concrete or the like, the tensile tester (K) or the like can be used to measure the compressive strength or the like. Compression test cannot be performed. Even if the tensile tester (K) is modified and used, the chucking parts (50a) (50b) of the tensile tester must be removed and modified. However, the next time a tensile test is performed, there is a drawback that it takes time and effort to replace the modified part with the chuck parts (50a) and (50b).

On the other hand, if a compression tester is to be installed separately from the tensile tester, it will require new space and cost, and a universal tester that can perform both tensile and compression tests will be purchased. When installed, there was a drawback that it required a great deal of expense.

Further, each of the above tensile or compression testers applies a load to a sample by operating a chuck part by a hydraulic cylinder mechanism, and the load is measured by measuring the hydraulic pressure. Therefore, there is a possibility that the measurement loss may occur due to the friction loss of the fluid flowing in the hydraulic piping. Furthermore, in the case of a tester with a large load capacity (the maximum load that can be loaded), there is generally a problem that the pressure receiving area of the cylinder also increases and the above error is magnified. However, the capacity of the measuring instrument that measures the load becomes large and the measurement accuracy becomes rough, and there is a drawback that it is not suitable for measuring the compressive strength of low-strength mortar, glass, etc., and for measuring the load and displacement to obtain the Young's modulus. It was

The present invention is intended to solve the above problems, and enables a compression test to be performed without modifying the tensile tester, and it is possible to perform a compression test regardless of the capacity of the tester. The objective is to provide a compression test jig that can easily measure the compression strength of concrete, mortar, etc., which have relatively low strength. In addition, the present invention can measure the load applied to the test piece directly without using hydraulic pressure, and can measure the displacement of the test piece due to the applied load. It intends to provide a test jig.

[0009]

[Means for Solving the Problems]

 The jig for compression test of the present invention which solves the above-mentioned problem is provided with guide rods extending in the opposite directions on both press plates facing each other in parallel, so that both press plates are separated from each other. The guide rods are provided as guides so as to be movable in opposite directions, and at the end of the extension side of each guide rod, a connecting means to a chuck portion of a tensile tester or the like is provided. Is.

In the above-mentioned compression test jig, it is preferable to provide a load scale such as a load cell on either one of the connecting means, and further, on any one of the pressure plates, a relative load between the other and the other. It is preferable to provide a displacement gauge for measuring movement.

[0011]

[Action]

 The above-mentioned jig for compression test of the present invention is used for performing a compression test of concrete, mortar and various other materials by a tensile tester. At that time, the connecting means provided at the extension side end portions of the guide rods projectingly provided on both the pressure plates facing each other are connected to the chuck portions facing each other of the tensile tester by chucking or engaging means, In addition, the specimen of the material to be compression tested, such as concrete or mortar, is inserted and set between the two pressure plates facing each other.

In this state, the tensile tester is operated in the same manner as in the tensile test, and the two opposing chuck portions are pulled in the direction in which they are separated from each other, so that the connecting means and the guide rod connected to this are connected. Both pressurizing plates are towed via the guide rods, and the guide rods on the other side of the two pressurizing plates move relative to each other in a direction in which they approach each other. Along with this, the specimen between the pressurizing plates is compressed. That is, the compression test is performed by the same operation as the tensile test of the tensile tester.

By providing a load cell such as a load cell in any one of the above-mentioned connecting means, the load applied to the sample can be directly measured. In the case of measuring the hydraulic pressure, Such an error does not occur.

When a displacement meter is provided on one of the pressure plates, the displacement due to compression of the specimen can be measured by the relative movement amount between the pressure plate and the other pressure plate. It will be possible to measure the displacement at. Therefore, the compression strength can be easily and accurately measured by these measured values.

[0015]

【Example】

 Next, one embodiment of the present invention will be described with reference to FIGS.

FIGS. 1 and 2 show the overall structure of a compression test jig according to the present invention, and FIGS. 3 to 7 show a part thereof.

In the figure, (1a) and (1b) are two upper and lower pressure plates that face each other in parallel with each other with a required space between which a specimen such as concrete can be inserted. Guide rods (2a) and (2b) extending in opposite directions are provided on the lamina (1a) and (1b), respectively, so that the pressure plates (1a) and (1b) of the two guide rods (2b) ( 2a) as a guide so as to be movable in opposite directions, that is, movable in the approaching direction and the separating direction.

As shown in the figure, two guide rods (2a) and (2b) are respectively arranged on both pressure plates (1a) and (1b), one (2a) is arranged in a left-right position and the other is arranged in a front-rear position in a staggered manner. The two pressurizing plates (1b) and (1a) are loosely inserted into the through holes provided in the other pressing plates (1b) and (1a), and are combined so as to be movable in opposite directions. Reference numeral (21) is a fastening nut for fixing the guide rods (2a) (2b) to the pressure plates (1a) (1b).

By arranging the guide rods (2a) and (2b) as described above, both the pressure plates (1a) and (1b) are held in a well-balanced manner, and the load applied to the specimen during the compression test. And the movement accompanying it is performed well. Of course, three or more guide rods may be arranged substantially evenly and projected. The shape is not limited to the round bar shape shown in the figure, and may be a square bar shape, a plate shape, or a hollow bar shape.

Further, connecting means (3a) (3b) to the chuck portion of the tensile tester and the like are provided at the extending end portions of the guide rods (2a) (2b).

In the connecting means (3a) (3b) shown in the figure, the fixing plates (31a) (31b) are fastened to the extension side end portions of the two guide rods (2a) (2b) by tightening nuts or the like. The pulling rods (32a) and (32b) are fixed to the central portions of the fixing plates (31a) and (31b) by fastening means such as nuts. ) (32b) is configured such that the ends thereof are connected to chuck portions (50a) (50b) of a tensile tester (K) illustrated in FIGS. 8 and 9 by chucking or engaging means. Has been done.

That is, when the end portions of the pull rods (32a) (32b) are connected to the chuck portions (50a) (50b), both the pressure plates (1a) (1b) are operated by the operation of the pull tester (K). ) Moves toward each other so that the specimen (O) such as concrete sandwiched between the pressure plates (1a) and (1b) can be compressed.

Of course, in accordance with the structure and form of the chuck parts (50a) (50b) of the tensile tester (K), any form and structure can be adopted which can be connected by chucking or engaging means corresponding to the chuck part. Can be carried out.

Further, among the connecting means (3a) (3b) provided at the extension side end portions of the guide rods (2a) (2b), the connecting means (3b) connected to the lower pressure plate (1b) is connected. A load cell (4) such as a load cell is attached to the tension rod (32b) as shown in FIG. 7, so that the load during the compression test by the tension operation can be directly measured. The measurement value of the load meter (4) is sent to a recorder or display means such as an operation control unit by the measurement code (4a) so as to be recorded and displayed. The load meter (4) may be provided in the lower connecting means (3a).

Of the pressure plates (1a) (1b) facing each other in parallel, a measurement plate (8) is attached to both side ends of the upper pressure plate (1a), and the measurement plate (8) is attached to the measurement plate (8). Displacement gauges (5) such as operating transformers and magnescales are provided in contact with or connected to each other, and projecting support rods are provided on both sides of the lower pressure plate (1b) whose width is larger than that of the upper pressure plate (1a). The mounting plate (7) is fixed to the support rod (6) and the displacement meter (5) is supported by the mounting plate (7). By 5), the relative movement of both pressure plates (1) and (1b) during the compression test, that is, the displacement due to the compression of the specimen (O) can be measured. The measurement value of the displacement gauge (5) is sent to a recorder such as an operation control unit or a display means by the measurement code (5a) to be recorded and displayed. The displacement gauge (5) may be provided in contact with or connected to the lower pressure plate (1b), contrary to the above.

The pressure plates (1a) and (1b) are not limited to those having a substantially rectangular plane shape, and may have other shapes such as a flat circle shape and an elliptical shape.

As shown in FIG. 1, FIG. 2 and FIG. 3, the mounting plate (7) holds the displacement gauge at the bent portion of the plate of U-shaped plane, and supports both ends of the plate at the support rod (6). ) Is clamped and fastened (9) with bolts, nuts, etc. to fix it in place.

The compression test jig having the above-mentioned configuration is used for performing a compression test on concrete, mortar, glass, synthetic resin, rock, etc., using a tensile tester (K) shown in FIGS. 8 and 9, for example. The specimen (O) such as concrete, mortar, glass, etc., which is used for, is usually a pillar or a cylinder.

Then, the compression test jig of the present invention is provided with the upper and lower connecting means (3a) (3b) provided at the extension side end portions of both guide rods (2a) (2b) by a tensile tester ( K) The chuck parts (50a) (50b) facing each other above and below are chucked and connected to each other, and the specimen (O) is sandwiched between the two press plates (1a) (1b) facing each other. set. It is desirable to provide a seat portion (11) for holding the specimen (O) at the axial center position without displacement on the facing surfaces of the pressure plates (1a), (1b).

In this state, the cylinder mechanism (54) of the tensile tester is operated in the direction in which the chuck portions (50a) (50b) are separated from each other in the same manner as in the tensile test, and the lower chuck portion (50b) is operated. Pull downwards. By this pulling action, the opposing pressure plates (1a) (1b) are connected via the connecting means (3a) (3b) connected to the chuck parts (50a) (50b) and the guide rods (2a) (2b). The other guide rods (2b) and (2a) are used as guides to relatively move in a direction in which they approach each other, and the specimen (O) sandwiched between both pressure plates (1a) and (1b) is compressed. .

Therefore, the compression test is performed by directly performing the same operation as the tensile test without modifying the tensile tester (K).

At this time, the load applied to the sample (O) is directly measured without error by the load cell (4) such as a load cell provided in the one connecting means (3b). Further, by the displacement gauge (5) provided on one of the pressure plates (1a), the displacement due to the relative movement of both pressure plates (1a) (1b), that is, the displacement of the specimen (O) due to the compression, In other words, the compressive strain is measured, and in particular, the displacement under the applied load is accurately measured, and the compressive strength of the specimen (O) can be accurately measured by these measured values, and the Young's modulus etc. It will be easy to ask.

[0033]

[Effect of device]

 As described above, if the compression test jig of the present invention is used, the tensile tester can be used in the same way as when performing the tensile test as it is regardless of the load capacity, and concrete, mortar, glass, synthetic resin, etc. It is possible to perform a compression test such as compressive strength of a sample made of the above material, there is no need to modify the tensile test machine, and two test machines for tension and compression or a universal test machine are provided. There is no need.

Moreover, since the two pressure plates for compressing the test piece can be moved relative to each other by using the guide rods protruding from each other as guides, the parallel state is always maintained well. Therefore, the compression test can be performed well.

Furthermore, by providing a load cell such as a load cell on one of the connecting means, the load applied to the sample can be directly and accurately measured, and a displacement meter is provided on one of the pressure plates. By doing so, the displacement of the specimen under the applied load can be measured point by point, and an accurate compression test can be performed.

In particular, in the compression test jig having the load cell such as the load cell and the displacement gauge as described above, even if the type of the tensile tester used is changed, the load gauge and the displacement gauge are changed. The measured values of are obtained as the same electric signal, and it becomes extremely easy to construct a system with a computer such as analyzing the measured values to obtain the Young's modulus.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of the present invention.

FIG. 2 is a side view of the above.

3 is a cross-sectional view taken along the line AA of FIG.

FIG. 4 is a cross-sectional view taken along the line BB of FIG.

5 is a cross-sectional view taken along the line CC of FIG.

6 is a cross-sectional view taken along the line DD of FIG.

FIG. 7 is a partially cutaway side view of a load cell portion.

FIG. 8 is a front view of a tensile tester.

FIG. 9 is a side view of the above.

[Explanation of symbols]

 (1a) (1b) Pressure board (2a) (2b) Guide rod (3a) (3b) Connecting means (4) Load meter (5) Displacement meter (6) Support rod (O) Specimen (K) Tensile tester

Claims (3)

[Scope of utility model registration request] 1. A guide rod extending in the opposite direction to each of the pressure plates facing each other in parallel is provided so as to project, and both pressure plates are moved in the opposite direction with the other guide rod as a guide. A jig for compression test characterized in that it is provided freely and at the extension side end of each guide rod, a connecting means to a chuck part of a tensile tester or the like is provided. 2. The compression test jig according to claim 1, wherein one of the connecting means is provided with a load cell such as a load cell. 3. The compression test jig according to claim 1 or 2, wherein one of the pressure plates is provided with a displacement gauge for measuring relative movement between the pressure plate and the other pressure plate.