JPS6113955Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of an anvil for verification of a concrete testing machine.

BACKGROUND ART Conventionally, a concrete testing machine as shown in FIG. 1 has been used to examine physical properties such as hardness, compressive strength, and density of concrete structures. This concrete testing machine 1 has a detection needle 3 attached to the tip of a substantially cylindrical main body 2 so as to be able to move in and out. A spring member (not shown) is interposed between the rear end of the detection needle 3 and the main body 2. On the outer peripheral surface of the main body 1, there is a conversion table 4 for reading the physical property values of the test specimen from the amount of movement of the detection needle 3, and a stopper (not shown) for the detection needle 3, which is biased forward by the spring member. A switch 5 is provided to release the switch and push it forward.

Therefore, such a concrete testing machine 1 is as follows:
The surface of the test piece is struck with the detection needle 3, and the physical property values of the test piece are measured from the conversion table 4 based on the amount of rebound movement of the detection needle 3 at that time. Whether or not the measured values of the concrete testing machine 1 are correct is determined by verifying the highest and lowest measured values of the concrete testing machine 1 using a verification anvil 6 as shown in FIG.

As shown in the figure, the verification anvil 6 has a guide tube 8 erected on one end surface of a cylindrical steel ingot 7 into which the detection needle 3 of the concrete testing machine 1 is inserted. A viewing window 9 is provided in the. Further, the end surface of the steel ingot 7 that is struck by the tip of the detection needle 3 inserted into the guide tube 8 is previously set to a predetermined hardness by quenching. Therefore, the highest measured value of the concrete testing machine 1 is verified using a verification anvil 6 made of a steel ingot 7 that has been hardened to a high degree of hardness, and the lowest measured value is verified by a steel ingot 7 that has been hardened to a low hardness. The test is carried out using a verification anvil 6 made of a steel ingot 7 which has been subjected to a test.

However, in the verification anvil 6 used for verifying the lowest measured value, the surface of the steel ingot 7 that is struck by the detection needle 3 is soft, so that a concave mark is formed at the striking location after each striking test. Therefore, in order to perform the impact test many times, it is necessary to view the impact surface of the steel ingot 7 through the viewing window 9 of the guide tube 8 and change the impact position of the detection needle 3 for each impact test. As a result, steel ingot 7
The striking surface area of the test anvil 6 must be increased, and if the striking surface area is increased, the weight of the verification anvil 6 will also increase, making it difficult to move it. Furthermore, as the number of impact tests increases, many dents are formed on the impact surface of the steel ingot 7, so the impact surface often has to be polished to make it smooth.

The present invention has been developed in view of these points, and eliminates the need for polishing the striking surface that is struck by the detection needle of the concrete testing machine, and allows the measurement values of the concrete testing machine to be verified with high accuracy. The present invention provides a verification anvil for a concrete testing machine that is lightweight.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 3 is a sectional view of an embodiment of the present invention. In the figure, reference numeral 10 denotes a metal hollow cylinder, and the upper end opening of the metal hollow cylinder 10 is sealed with a metal plate 11. The metal plate 11 is detachably attached to the upper end of the metal hollow cylinder 10 by a fixing ring 12. The metal plate 11 is made of a material such as tool steel. The surface of the metal plate 11 is hardened to a predetermined hardness, and a cylindrical protrusion 13 is provided approximately at the center thereof. The thickness of the metal plate 11 is
It is desirable to set it appropriately according to the measured value of the concrete testing machine to be verified (described later). metal plate 1
A guide tube 15 is provided on the upper surface of the guide cylinder 15, and the guide tube 15 has an insertion hole 14 formed in its lower end surface into which the protrusion 13 is inserted, so that the protrusion 13 is inserted into the insertion hole 14. The guide tube 15 is fixed to the metal plate 11 by a screw 16 attached to the lower end surface. A viewing window 17 is provided at the lower end of the guide tube 15. A buffer cloth 18 is inserted into the inner peripheral surface of the upper end opening of the guide tube 15 . Note that the lower end opening of the hollow metal cylinder 10 is sealed with a floor plate 19.

According to the verification anvil 20 of the concrete testing machine configured as described above, the measured value of the concrete testing machine can be verified as follows.

As mentioned above, the concrete testing machine has a detection needle 3 attached to the tip of the approximately cylindrical main body 2 shown in FIG. It is now possible to read the physical property values of

When verifying the minimum measured value of such concrete testing machine 1, a thick metal plate 11 exhibiting an amount of deflection corresponding to the reference value of the minimum measured value to be verified is placed in advance at the upper end opening of the hollow metal cylinder 10. Fix it with a fixing ring 12.

Next, in the guide tube 15 of the verification anvil 20 to which such a predetermined metal plate 11 is attached,
As shown in FIG. 4, the concrete testing machine 1 is inserted while observing through the viewing window 17 so that the tip end of the detection needle 3 faces the protrusion 13.

Thereafter, the switch 5 of the concrete testing machine 1 is pressed to cause the detection needle 3 to strike the protrusion 13.
When the protrusion 13 is struck, the metal plate 11 is bent by an amount corresponding to the striking force of the detection needle 3 since the metal plate 11 is set to have a predetermined thickness in advance. When the detection needle 3 separates from the protrusion 13, the metal plate 11 returns to its original state and is no longer bent. The lowest measured value of the concrete testing machine 1 is verified by checking whether the measured value read based on the rebound movement amount of the detection needle 3 at this time matches the reference value of the lowest measured value. do. Similarly, the verification accuracy can be increased by performing the impact test many times.

In this way, the verification anvil 20 of this concrete testing machine consists of a metal plate 1 set to a predetermined thickness.
Since the lowest measured value is verified using the deflection of the metal plate 11, there are almost no concave marks formed on the surface of the metal plate 11 (the surface of the protrusion) even after the impact test. Therefore, even after a large number of impact tests, there is no need to polish the surface of the metal plate 11. As a result, the area of the striking surface (area of the top of the protrusion 13) can be reduced, and since the metal plate 11 is fixed to the hollow metal cylinder 10 with a hollow interior, its weight is extremely light. Because of this, it is easy to carry.

In addition, when verifying the highest measured value of the concrete testing machine 1, the upper end opening of the hollow metal cylinder 10 is sealed in advance with a thick metal plate 11 exhibiting an amount of deflection corresponding to the reference value of the highest measured value to be verified. The guide cylinder 1 similarly attached to this metal plate 11 is
This is done by inserting the detection needle 3 of the concrete testing machine 1 into the concrete tester 5 and striking the protrusion 13, and checking whether the read value at that time matches the reference value.

Further, according to the verification anvil 20 of this concrete testing machine, by attaching the thick metal plate 11 exhibiting the amount of deflection corresponding to the reference value of the desired measurement value to the metal hollow cylinder body 10, any arbitrary value can be obtained. This allows verification of measured values.

As explained above, according to the verification anvil of the concrete testing machine according to the present invention, the measured values of the concrete testing machine can be determined by utilizing the deflection of the metal plate detachably attached to the upper end opening of the hollow metal cylinder. Since the testing is carried out, it is possible to eliminate the need for polishing the striking surface, and it has remarkable effects such as being able to test the measured values of the concrete testing machine with high accuracy.

[Brief explanation of the drawing]

Figure 1 is a perspective view of the concrete testing machine, and Figure 2 is a perspective view of the concrete testing machine.
The figure is a perspective view of the verification anvil of a conventional concrete testing machine, FIG. 3 is a sectional view of an embodiment of the present invention, and FIG. FIG. 2 is an explanatory diagram showing a state in which a concrete testing machine is being tested. 10...Cylindrical body, 11...Metal plate, 15...Guide cylinder, 20 ...Anvil for verification of concrete testing machine.

Claims (1)

[Scope of utility model registration request] A metal plate provided with a protrusion at the center of the upper surface, which is attached to the top open end of a metal hollow cylinder so as to seal the open end; and a metal plate which is attached to the upper surface of the metal plate so as to accommodate the protrusion. It consists of a guide tube and a
An anvil for verification of a concrete testing machine, characterized in that a measuring needle of the concrete testing machine is inserted into the guide tube and hits the protrusion to verify the measured value.