JP3423868B2 - Non-contact concrete length tester and accessory cradle for mortar specimen - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a non-contact type concrete length tester, and more specifically,
Length testing of hardened concrete relates laborsaving and accessory cradle for mortar specimens used therewith contactless concrete length test machine and that can be performed with high accuracy.

[0002]

2. Description of the Related Art The dial gauge method has been known as a test method for measuring the length of hardened concrete.
This method requires a gauge plug for a length test to be embedded when the specimen is compacted, which is a very troublesome work. Also, in the concrete length measurement, there is an error in the measured value due to the mounting of the side long frame, the displacement due to the inclination of the specimen, the displacement of the spindle of the dial gauge and the gauge plug, and the reading of the dial gauge, and the accuracy is 1/1000. Has become. As described above, the conventional length test for concrete not only consumes a great deal of labor and time, but also has serious drawbacks such as individual error and negligence in measured values.

[0003]

SUMMARY OF THE INVENTION Therefore, the present invention overcomes the drawbacks of the conventional length tester, and saves labor, reduces costs, and improves accuracy. The purpose is to provide a testing machine. This length tester has an inclined surface,
A concrete length test specimen (also called a specimen ) can be easily installed on the pedestal by the weight of the specimen. In addition, the specimen mounted on the pedestal can be accurately measured without contacting the specimen by measuring with a high-precision laser displacement meter installed at the upper end of the cradle. Becomes Furthermore, it is possible by kicking Installing the supplied pedestal for mortar specimens drop-in as an accessory, corresponding to the measurement of the change in length of the mortar specimen.

[0004]

Therefore, the technical solution adopted by the present invention is to provide an inclined pedestal, a specimen support portion provided on an inclined surface of the inclined pedestal, and a lower end of the inclined pedestal. Test piece receiving part provided on the slope and the concrete placed on the inclined surface.
To correspond to the chip position provided on the test piece side for length test
A ball provided in the specimen receiving portion and a laser displacement meter provided at the upper end of the inclined pedestal are provided, and further, the specimen supporting portion is provided with an inclination for making it easy for the specimen to slide on the inclined surface. surface
On top of multiple rotating bodies such as rollers, balls, or friction
A non-contact type computer characterized by providing a small number of materials
It is a cleat length tester . In addition, the inclined pedestal, the specimen support portion provided on the inclined surface of the inclined pedestal , and the inclined pedestal
Attached pedestal that supports the mortar specimen formed on the inclined surface
A hole for fitting the legs of the tilted pedestal, a sample receiving part provided at the lower end of the inclined pedestal , and a laser displacement meter provided at the upper end of the inclined pedestal, and the sample supporting part is further provided. , Rollers, balls, etc. on the inclined surface to make the test piece slippery on the inclined surface
Of multiple rotating bodies or materials with a small coefficient of friction
It is a non-contact type concrete length tester characterized by that . In addition, an accessory pedestal that supports a mortar sample that can be installed on the inclined pedestal of the non-contact concrete length tester, wherein the accessory pedestal is an inclined pedestal and the inclined pedestal A mortar specimen support part provided on a surface, a mortar specimen support part provided at a lower end portion of the inclined pedestal, and a leg portion. Further, the inclined pedestal includes rollers on an inclined surface,
An accessory pedestal for a mortar specimen, which comprises a plurality of rotating bodies such as balls or a material having a small friction coefficient.

[0005]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a plan view of a non-contact type concrete length tester according to an embodiment of the present invention, and FIG. 2 is a side view of the same.
FIG. 3 is a view on arrow A in FIG.

In the figure, the non-contact type concrete length tester has an inclined pedestal 1 provided with an inclined surface 2, and the lower end of the inclined pedestal 1 is a concrete length test sample.
A specimen receiving portion 3 for receiving a body (hereinafter also referred to as a specimen and details will be described later ) 10 is provided. An attached pedestal for a mortar specimen , which will be described later, is installed at a predetermined position on the inclined surface 2.
A hole 2a is formed.

The inclined surface 2 is provided with a specimen support portion 4 which has a function of facilitating the downward movement of the concrete length test specimen 10 along the inclined surface 2. The specimen support 4 is composed of a plurality of rollers as shown in the figure. However, a plurality of balls may be used instead of the rollers, and a material having a very small coefficient of friction with the concrete length test specimen 10 may be arranged on the entire inclined surface. Since the concrete length test specimen 10 as described above is formed on the inclined surface 2 with the cone support portion 4 which is slippery, it is extremely easy to install the concrete length test specimen 10 on the pedestal. Becomes

In the specimen receiving portion 3, a ball 3a is provided at a portion corresponding to the position of the tip 10a provided on the concrete length test specimen 10 side.
This ensures the contact with the chip 10a on the side of the specimen 10. For this reason, it is important to install the ball 3a and the concrete length test specimen 10 so that their tip positions are aligned with each other. A high-precision laser displacement gauge 5 for measuring the length of the concrete length test specimen 10 is attached to the upper end of the inclined pedestal 1. High precision laser displacement meter 5
Is fixed to a plate with three taps on the main body, taking care not to come into contact with the concrete length test specimen 10, and is connected to the controller using a connection cord. The length of the concrete length test specimen 10 is measured by this laser displacement meter.

FIG. 4 is a front view and a side view of a measuring portion of the high precision laser displacement meter 5, and FIG. 5 is a front view of a display unit 7 for displaying a measurement result from the high precision laser displacement meter 5. It is a rear view. As the high-precision laser displacement meter 5 and the display unit 7, commercially available ones are used, and in particular, the high-precision laser displacement meter LC-2450 manufactured by Keyence is used here. The measuring unit uses a diffuse reflection type, and its specifications are as follows. Measuring range: ± 8 mm, working distance: 50 mm, light emitting and receiving angle: 22 °, light source: semiconductor laser, minimum spot system: 4
5 × 20 μm, resolution: 0.5 μm, linearity: ± 0.0
5 of FS, sampling frequency: 50 kHz, response time: 100 μs, average number of measured values: 1 to 131072 times, offset range: ± 7.9995 mm, etc. The height to where the laser is emitted is
Chip 1 of specimen 10 for concrete length test described later
It is important to fix the measuring part so that it matches 0a. The measuring unit is connected to the display unit 7 by the connection cord 6 .

Continuing on, referring to FIGS. 6 and 7, a concrete length test specimen 10 used in the length tester of this embodiment.
And the standard scale 11 will be described. As shown in FIG. 6, the concrete length test specimen 10 has a rectangular parallelepiped shape, and metal chips 10a for reflecting a laser are adhered to each end face in the longitudinal direction by an adhesive. There is. The metal tip is preferably made of stainless steel that does not cause rust. FIG. 7 exemplifies the standard rod 11 attached to the length tester, and the side surface is for reflecting the laser and is preferably flat and smooth. The standard rod is made of metal having a low expansion coefficient.

In order to measure the length by the non-contact type concrete length tester as described above, a concrete length test specimen 1 is mounted on an inclined pedestal 1 of the length tester as shown in FIG.
Place 0. At this time, the height to the place where the laser is emitted and the tip 10a of the specimen 10 for concrete length test
It is important to fix the measuring portion of the high-precision laser displacement meter 5 so that the position of the same coincides. After the preparation is completed, the length is measured by the high-precision laser displacement meter 5 by a known method, and the measurement result is displayed on the display 7. If necessary, the standard length 11 is used to measure the standard length.

In the present embodiment, the length tester is used as described above, and the displacement is accurately measured by the high-precision laser displacement meter 5 without contacting the concrete, so that there is little personal error or negligence during measurement. Become. Installation of the concrete length test specimen 10 on the tester can be done quickly and easily. Since the chips are attached to the concrete length test specimen 10 by an adhesive agent, it is not necessary to use a special specimen (comparator specimen frame), which saves costs. There are merits such as. .

Next, the measurement of the mortar specimen 20 will be described. Mortar specimen 20 has a concrete length
The length is shorter than that of the test specimen , so the model shown in the figure
The attached pedestal 21 for the rutar specimen is used . This accessory pedestal 21 has substantially the same structure as the pedestal of the above-mentioned tester,
It is used by fitting the leg portion 22 of the attached pedestal 21 into the hole 2a formed in the inclined surface 2 of the inclined pedestal 1 of the above-described tester. The inclined surface 23 of the auxiliary pedestal 21 is provided with rollers 24 and the like for improving the sliding of the specimen as in the case of the inclined pedestal 1 of the testing machine described above, but the mortar specimen 20 is a concrete length test specimen. for lighter small fence size than 10, it is also possible to omit the less or roller itself the number of <br/> the rollers will this.

[0014] While standard scale for mortar specimens 20 and mortar are the same shape as the above-mentioned concrete length test specimen and co emissions <br/> cleat standard scale, it has become a small size . And the mortar specimen 20 is
As shown in FIGS. 9 and 10, the length is measured by a well-known method by being mounted on the auxiliary pedestal 21 and using the high precision laser displacement meter 5.

Although the embodiment of the present invention has been described,
Various modes can be implemented within the scope of the present invention. For example, it is possible to provide a guide member that guides the side of the test piece, or to provide a caster or the like on the bottom to facilitate the movement of the tester itself.

[0016]

As described in detail above, according to the present invention, a non-contact type concrete length tester includes an inclined pedestal, and a specimen support portion provided on the surface of the inclined pedestal. The test piece receiving part provided at the lower end of the tilted pedestal and the laser displacement meter provided at the upper end of the tilted pedestal make it quick and easy to install the test piece in the testing machine. Therefore, it is possible to measure displacement without contact, improve accuracy, and reduce costs. Also, the length of the mortar sample can be easily measured by attaching the accessory pedestal for the mortar sample as an accessory. Furthermore, it is possible to reduce personal error and negligence when measuring the length. Since the chip is attached to the sample by an adhesive agent, it is not necessary to use a special sample (comparator sample frame), and it is possible to achieve excellent effects such as cost reduction.

[Brief description of drawings]

FIG. 1 is a plan view of a non-contact concrete length tester according to an embodiment of the present invention.

FIG. 2 is a side view of FIG.

FIG. 3 is a view on arrow A in FIG.

FIG. 4 is a front view and a side view of a high precision laser displacement meter.

FIG. 5 is a front view and a side view of a display unit.

FIG. 6 is a front view and a side view of a specimen for concrete length test.

FIG. 7 is a front view and a side view of a standard scale.

8A and 8B are a front view and a plan view of the attached mount.

FIG. 9 Non-contact type concrete length test in a state of measuring a mortar specimen

FIG. 10 is a side view of FIG.

[Explanation of symbols]

1 inclined pedestal 2 slope 2a hole 3 Specimen receiving part 3a ball 4 Specimen support (rollers, balls, etc.) 5 High precision laser displacement meter 6 connection cord 7 Display unit 10 Specimen for concrete length test 10a chip 20 Mortar specimen 21 Attached pedestal 22 legs 23 Inclined surface 24 Specimen support (rollers, balls, etc.)

Claims (4)

(57) [Claims] 1. An inclined pedestal, a sample support portion provided on an inclined surface of the inclined pedestal, a sample support portion provided at a lower end portion of the inclined pedestal, and a mount on the inclined surface. Concrete length test
Corresponding to the chip position provided on the test specimen side
The ball provided in the receiving portion, and a laser displacement meter provided in the upper end portion of the inclined pedestal, further, in the sample support portion,
In order to make the test piece slippery on the inclined surface
Multiple rotating bodies such as la, balls, etc., or small friction coefficient
Non-contact concrete characterized by the provision of new materials
Length tester. 2. An inclined pedestal, a sample support portion provided on the inclined surface of the inclined pedestal , and a module formed on the inclined surface of the inclined pedestal.
A hole to fit the leg of the attached pedestal that supports the Lutal specimen,
The tilt receiving base is provided with a specimen receiving portion provided at a lower end portion thereof, and a laser displacement meter provided at an upper end portion of the tilt receiving base. Further, the specimen supporting portion has a specimen sliding on an inclined surface. In order to make it easier , multiple rotating bodies such as rollers and balls on the inclined surface,
Is characterized by having a material with a small friction coefficient.
Contact type concrete length tester. 3. An accessory pedestal for supporting a mortar specimen, which can be installed on the inclined pedestal according to claim 2.
The accessory pedestal comprises an inclined pedestal, a mortar sample support provided on the surface of the inclined pedestal, a mortar sample reception section provided at the lower end of the inclined pedestal, and legs. An accessory pedestal for mortar specimens. 4. The mortar specimen according to claim 3, wherein the inclined pedestal is provided with a plurality of rotating bodies such as rollers and balls on the inclined surface or a material having a small friction coefficient. Pedestal for use.