JPH0593682A - Compression tester - Google Patents

Abstract

(57) [Summary] [Objective] To provide a compression tester capable of performing compression and tensile tests of concrete test pieces by one platen device. A ball bearing seat 31 having a ball seat surface 31a, and a compression platen 30 that is supported by the ball seat surface 31a of the ball seat receiver 31 in a spherical contact manner and swingably supported. The pins 50 are removably provided at at least two positions between the receiver 31 and the platen 30 so that the swinging of the platen 30 in one direction can be restricted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a compression tester equipped with a platen device having a ball seat support and a platen, and more particularly to a compression tester for concrete and the like which can be tested by the same device.

[0002]

2. Description of the Related Art FIG. 5 is a sectional view showing an example of a compression tester equipped with a conventional platen device. In the figure, reference numeral 1 is a table that is moved up and down by a ram cylinder (not shown), and 2 is a crosshead arranged above the table 1. The crosshead 2 is supported by a screw column (not shown) so as to be able to move up and down. The table 1 is provided with a lower platen 3 and the crosshead 2 is provided with an upper platen 4, and a test piece 5 to be subjected to a compression test is interposed between the lower platen 3 and the upper platen 4.

The upper platen 4 has a spherical surface portion 4a on the side opposite to the test piece 5, and this spherical surface portion 4a is a spherical surface on a ball seat receiver 7 attached to the crosshead 2 via a platen attachment member 6. Engaged in contact. At the center of the spherical portion 4a,
A lower end of a platen suspension rod 9 in which a universal joint 8 is interposed in the middle part is coupled, and an upper end of the platen suspension rod 9 is coupled to the crosshead 2 by a compression coil spring 10 and a nut 11. As a result, the upper platen 4 is swingably supported by the ball seat receiver 7 and functions as a ball seat type platen during the compression test.

When the above-mentioned ball-seat type platen is a fixed type platen, that is, when the upper platen 4 is fixed to the ball-seat receiver 7, the test piece is subjected to the compression test, as shown in FIG. It is sufficient to insert a ring-shaped spacer 12 that can be divided into two between the stepped portion 4b formed on the outer periphery of the spherical portion 4a side and the lower surface of the ball seat receiver 7 facing the stepped portion 4b.

[0005]

However, in the above-mentioned conventional compression tester, when the compression tester is used to perform not only compression of the test piece but also tensile test, the platen device itself is used. There was a problem that it was necessary to replace.

[0006] For example, the compression test of concrete is carried out by inserting a columnar concrete test piece between the upper platen 4 and the lower platen 3, and the tensile test of concrete using a compression tester It is performed by inserting a columnar concrete test piece in a horizontal state between the upper platen 4 and the lower platen 3 and applying a compressive force to the side surface to extend (that is, pull) the test piece in the axial direction. Therefore,
In the tensile test, it is necessary to prevent the upper platen 4 from swinging around the axis of the test piece to prevent the compressive force of the upper platen 4 and the lower platen 3 from deviating from the axis of the concrete test piece. For this reason, when performing a compression test on concrete using a conventional compression tester, it is necessary to replace with a platen (hereinafter referred to as a tilted platen) that prevents rocking with respect to one horizontal axis. There was a problem.

An object of the present invention is to provide a compression tester capable of performing compression and tensile tests on concrete test pieces and the like with a single platen device.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described with reference to FIG. 1 showing an embodiment. In the present invention, a ball seat support 31 having a ball seat surface 31a and a ball seat surface 31a of the ball seat support 31 are provided. The present invention is applied to a compression tester including a platen 30 that is in spherical contact with and is swingably supported. Then, the above-mentioned object is achieved by providing pins 50 removably at at least two positions between the ball seat receiver 31 and the platen 30 so that the swinging of the platen 30 in one direction can be restricted. It

[0009]

If at least two pins 50 are inserted between the platen 30 and the ball seat receiver 31 to regulate the swinging of the platen 30 in one direction, the pin 50 acts as a so-called inclined platen to perform a tensile test of concrete or the like. Will be possible. On the other hand, since the platen 30 can swing in all directions when the pin 50 is not inserted between the platen 30 and the ball seat receiver 31, the platen 30 acts as a so-called ball seat type platen to compress concrete or the like. Testing is possible.

Incidentally, in the section of means and action for solving the above problems for explaining the constitution of the present invention, the drawings of the embodiments are used for the purpose of making the present invention easy to understand. It is not limited to.

[0011]

Embodiments of the present invention will now be described in detail with reference to the drawings. 1 and 2 are views showing one embodiment of a compression tester according to the present invention, in which FIG. 1 is an enlarged front view showing the vicinity of a ball seat receiver and an upper platen, FIG.
2A is a front view showing the overall configuration of the compression tester, and FIG. 2B is a sectional view taken along the line bb of FIG. 2A.

In FIG. 2, the main body of the testing machine indicated by the general reference numeral 20 is a ram cylinder 22 for compressive and tensile loads installed in a base 21, a table 23 fixed to the upper end of the ram cylinder 22, and a table 23. A pair of struts 24 standing upright on one diagonal position, an upper crosshead 25 laid across the upper ends thereof, and a pair of screw columns standing upright on the base 21 penetrating the other diagonal position of the table 23. 26 and a lower crosshead 27 screwed to the screw column 26 via a nut (not shown). The lower crosshead 27 is moved up and down by rotating a nut (not shown) by a motor 28 attached to the lower crosshead 27. Thereby, the distance from the upper crosshead 25 or the table 23 can be adjusted according to the length of the test piece to be subjected to the tensile test or the compression test. In FIG. 2, 29 is a table 2
3 is a lower platen for compression test provided on the upper part of FIG.

Returning to FIG. 1, reference numeral 30 denotes an upper platen in which cylindrical members having different diameters are vertically stacked and integrated with each other. The upper platen 30 has a top surface, that is, a side opposite to the test piece TP. A spherical portion 30a is provided at the center of the surface. Similarly, reference numeral 31 is a cylindrical ball seat receiver, and a ball seat surface 31a which is in spherical contact with the spherical surface portion 30a of the upper platen 30 is formed on the lower surface of the ball seat receiver 31. A platen suspension rod 33 provided through the lower crosshead 27 is screwed onto the upper surface of the ball seat receiver 31 via a nut 34. It is suspended from the upper part of the head 27.

A plate-shaped mounting seat 37 is interposed between the ball seat receiver 31 and the lower crosshead 27. The mounting seat 37 is centered with respect to the lower crosshead 27, and a positioning pin 38 is inserted between the mounting seat 37 and the ball seat receiver 31, so that the ball seat receiver 31 is moved. It is aligned with the lower crosshead 27.

Reference numeral 40 is a mounting member fixed to the side surface of the ball seat receiver 31 via a bolt 41, and 42 is a support ring fixed to the lower portion of the mounting member 40. This support ring 4
From FIG. 2, a plurality of suspension rods 43 extend downward at intervals in the circumferential direction, and the upper ends of the suspension rods 43 are supported by the support ring 42 by the compression coil springs 44 and the nuts 45. The lower end of the suspension rod 43 is fixed to the side surface of the upper platen 30 by a bendable universal joint 46. As a result, the upper platen 30 is suspended from the ball seat receiver 31 in a swingable state with respect to the ball seat receiver 31.

Further, as shown in FIG. 3, four grooves 30b to 30e having a semicircular cross section extending in the radial direction of the upper platen 30 are formed at equal intervals on the outer circumference of the spherical portion 30a of the upper platen 30. In addition, a round bar-shaped pin 50 is provided in the gap between the grooves 30b to 30e and the lower surface of the ball seat receiver 31 as shown in FIG. This pin 5
0 indicates that the contact position between the pin 50 and the lower surface of the ball seat receiver 31 is
The diameter of the upper platen 30 is determined so as to be on a circular arc r concentric with the spherical surface portion 30a. In this embodiment, the diameter of the grooves 30b to 30e is larger than that of the pin 50.

In order to perform a concrete compression test using the compression tester having the above-mentioned configuration, the upper platen 30 and the lower platen 29 are not inserted between the upper platen 30 and the ball seat receiver 31. Between concrete test piece T
It suffices to insert P while standing upright and apply a compressive force to the concrete test piece TP by the upper platen 30 and the lower platen 29. In a state where no pin 50 is inserted between the upper platen 30 and the ball seat receiver 31, the upper platen 30 can swing in all directions without being restrained. That is, the upper platen 30 functions as a so-called ball seat type platen.

Next, in order to perform a tensile test of concrete by the compression tester of this embodiment, the spherical portion 3 of the upper platen 30 is used.
Pin 5 in a pair of grooves (for example, groove 30b and groove 30d, or grooves 30c and 30e) facing each other across 0a.
With 0 inserted, the upper platen 30 and the lower platen 29
Between the upper platen 30 and the lower platen 2 in such a manner that the concrete test piece TP is inserted sideways and the insertion direction of the pin 50 and the axis of the concrete test piece TP are orthogonal to each other.
A compressive force may be applied to the concrete test piece TP according to 9. In a state in which the pins 50 are inserted in two opposite positions of the upper platen 30, the upper platen 30 is restricted from swinging in the inserting direction of the pins 50, that is, swinging around the axis of the concrete test piece TP. That is, the upper platen 30 functions as a so-called inclined platen.

Further, all the grooves 30b of the upper platen 30-
When the pin is inserted into 30e, the upper platen 30 is in a state in which its swing is prohibited in all directions. That is, the upper platen 30 functions as a fixed platen.

Therefore, according to this embodiment, the upper platen 30
Since the grooves 30b to 30e are formed on the upper surface of the plate and the pin 50 is inserted into the pair of grooves sandwiching the spherical surface portion 30a, the rocking of the upper platen 30 in the insertion direction of the pin 50 is restricted. Both plate type and inclined platen can be realized by one platen device. As a result, the compression test and the tensile test of concrete or the like can be performed by the same compression tester and platen device, which can contribute to reduction in man-hours and costs.

The details of the compression tester of the present invention are not limited to the above-mentioned one embodiment, and various modifications are possible. As an example, the shape of the pin inserted between the upper platen and the ball seat receiver is not limited to the round bar shape as in the above-described embodiment. That is, as shown in FIG.
It is also possible that 0 is formed in the shape of a bisected square rod and the cut surface 50a is formed into a curved surface that is convex upward.
The shape of the pin is not limited as long as it is a pin that can regulate the swing of 0 in one direction. The pin shown in FIG. 4 has a large contact area between the pin and the platen or the ball seat receiver, which is advantageous when the load is large. The curvature of the cut surface 50a of the pin 50 is preferably substantially equal to the curvature of the spherical surface portion 30a. Further, the number of grooves to be formed needs to be two or more, but the number is not limited. However, in order to realize the three types of functions of the ball seat type platen, the inclined type platen and the fixed type platen as in the present embodiment, at least four pieces may be formed. In addition, if three grooves are formed at equal intervals in the circumferential direction, two types of functions of a ball seat type platen and a fixed type platen can be realized, and further, the weight can be reduced as compared with the conventional platen described above. it can.

[0022]

As described in detail above, according to the present invention, pins are removably provided at at least two positions between the platen and the ball seat receiver to regulate the swinging of the platen in one direction. Since this is possible, one platen device can be provided with the functions of both a ball seat type platen and a tilt type platen. Therefore,
It is possible to realize a compression tester capable of performing a compression / tensile test on concrete or the like with one platen device without replacing the platen device.

[Brief description of drawings]

FIG. 1 is a diagram showing a compression tester that is an embodiment of the present invention, and is a partial cross-sectional view showing enlarged the vicinity of an upper platen and a lower platen.

FIG. 2 is a front view and a sectional view showing an overall configuration of the compression tester.

FIG. 3 is a perspective view showing an upper platen.

FIG. 4 is a diagram showing a modified example of the pin.

FIG. 5 is a sectional view showing a conventional compression tester.

FIG. 6 is a view similar to FIG.

[Explanation of symbols]

 30 Upper Platen 30a Spherical Part 30b to 30e Groove 31 Ball Seat Receiver 31a Ball Seat Surface 50 Pin

Claims (1)

[Claims] 1. A compression tester comprising a ball bearing having a ball bearing surface and a platen supported in a spherical contact with the ball bearing surface of the ball bearing so as to be swingable, wherein the ball bearing is A compression tester characterized in that pins can be inserted into and removed from at least two positions between the platen and the platen so that swinging in one direction of the platen can be regulated.