JPH07128038A - Apparatus for measuring flatness of bottom surface of concrete-test-piece formwork - Google Patents

Abstract

PURPOSE:To measure the flatness of the bottom surface of a formwork in high accuracy by a simple operation by moving the measuring part of a laser displacement meter, casting laser light on the bottom surface of the formwork of a concrete test piece, and receiving the reflected light. CONSTITUTION:A concrete-test-piece formwork 1 is mounted on a rotary table 13. A measuring part 24 of a laser displacement meter is suspended from a nut 21 with a suspending member 25 and arranged in the formwork 1. At this time, the position of the nut 21 is adjusted with a rod 19 having a feed screw so that the measuring part 24 is positioned at the outermost side in the direction of the diameter of the measuring part 24. The table 13 is rotated with a rod 16 having a worm gear. At the same time, the rod 19 is rotated with a handle part 20. With the nut 21 being moved to the direction of the center from the outside, laser light rays are continuously emitted from a laser emitting part 24a of the measuring part 24 in a spiral pattern on a bottom surface 4 of the formwork 1 at the direcly lower side. The reflected laser light from the bottom surface is received with a light receiving part 24b, and the reference distance between the bottom surface 4 and the measuring part 24 is measured. Thus, the flatness of the bottom surface 4 is judged.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concrete test piece formwork bottom surface flatness measuring device, and more particularly to a device for determining the flatness accuracy of the bottom surface of a formwork forming a concrete test piece.

[0002]

2. Description of the Related Art Conventionally, for concrete, a sample is taken to form a test piece, and it is inspected whether or not it exhibits a predetermined strength. As a conventional form forming this test piece, a bottomed cylindrical form made of a light-weight disposable tin-plated tin steel plate or paper which is convenient to handle is used.

The product inspection standard of such a mold is JIS
1132-1993, the flatness of the bottom surface of the cylindrical formwork is within ± 0.02 mm. For this reason, conventionally, as shown in FIG. 6, a conventionally known dial gauge 3 is inserted through the opening 2 of the mold 1 to measure the flatness of the bottom surface 4. This measurement was a point measurement in which a plurality of points 5 were moved in a cross direction on the diameter line of the bottom surface 4 as shown in FIG.

[0004]

However, according to the conventional method for measuring the flatness of the bottom surface of the concrete test piece form as described above, it is very necessary for the measurement work such as the arrangement, movement and reading of the measurement value of the measurement dial gauge 3. There was a problem that it was troublesome and inefficient.

Further, the conventional method of measuring the flatness of the bottom surface of the test piece mold has a problem that the accuracy is poor because the measurement is point measurement. That is, in the measurement method using the measurement dial gauge 3, it is necessary to increase the number of measurement points in order to improve the accuracy of the flatness measurement, but this is physically impossible due to the size of the dial gauge 3. This is because the measurement accuracy (flatness accuracy) is not correct because the operator's individual error is included when the dial gauge is moved and reset at the measurement at each point, and the accuracy of the dial gauge itself is not so high as 0.01 mm. There was a big problem of low reliability.

The object of the present invention is to solve the above-mentioned conventional problems, and provides a bottom flatness measuring device for a concrete test piece formwork, which is easy to operate and has high reliability in measurement accuracy. To do.

[0007]

The present invention is an apparatus for measuring the flatness of the bottom surface of a concrete test piece mold, which has the following constitution in order to solve the above-mentioned technical problems. That is, the bottom flatness measuring device for a concrete test piece mold of the present invention comprises a rotary table 13 on which the bottomed cylindrical concrete test piece mold 1 is mounted, and means 15, 16 for rotating the rotary table 13, 16a, 17
And a moving body 21 arranged on the rotary table 13 above the concrete test piece form 1, and the moving body 21 is moved through the center position of the form 1 so as to traverse the upper opening. Means 19, 19c, 20, 2
2a and 22b, and a laser displacement meter provided with a measuring unit 24 suspended from the moving body 21 and arranged inside from the upper opening of the concrete test piece formwork 1, the measuring unit of the laser displacement meter. 24 is the moving body 2
The bottom surface 4 of the concrete test piece formwork 1 is made to emit laser light from the laser emitting part 24a while being moved by 1.
The reflected laser beam emitted toward the light receiving portion 24b
It is characterized by receiving light by.

[0008]

According to the apparatus for measuring the flatness of the bottom surface of the concrete test piece form according to the present invention, the concrete test piece form 1 is placed on the rotary table 13 and arranged on the rotary table 13 above the concrete test piece form 1. The measuring unit 24 of the laser displacement meter is suspended from the moving body 21. Next, a laser beam is emitted from the laser emitting section 24a of the measuring section 24 in this laser displacement meter to the bottom surface 4 immediately thereunder.

The laser beam applied to the bottom surface 4 of the mold is
The light is reflected by the bottom surface 4 and received by the light receiving section 24b of the measuring section 24,
The reference distance S between the bottom surface 1 and the measuring unit 24 is measured. In this way, when measuring the reference distance S between the bottom surface 4 and the measurement unit 24 of the laser displacement meter, the movable table 21 that suspends the measurement unit 24 of the laser displacement meter at the same time as rotating the rotary table 13 is used as a formwork. Move along the 1 diameter line.

As a result, the laser beam from the measuring section 24 of the laser displacement meter continuously irradiates the bottom surface 4 of the mold from the outside toward the center in a spiral shape. Therefore, it is possible to obtain highly accurate flatness measurement data.

[0011]

EXAMPLES The concrete test piece formwork bottom surface flatness measuring device of the present invention will be described in more detail with reference to the examples shown in the drawings. FIG. 1 shows a concrete test piece formwork bottom surface flatness measuring apparatus 10 according to an embodiment of the present invention. In the concrete test piece formwork bottom surface flatness measuring device 10 of this embodiment, a pedestal 11 and a ball seat 12 are provided.
The rotary table 13 is rotatably supported via the rotary table 13. The ball seat 12 is processed so as to ensure high horizontal accuracy of the rotary table 13.

Stands 12a, 12b, 12c and 12d are installed at four locations around the turntable 13. Of these four stands 12a to 12d, the two stands 12a in front of FIG. 1 and FIG.
Plates 14a and 14b are provided between the two stands 12b and between the two rear stands 12c and 12d at substantially the same position as the rotary table 13, and each end is fixed to each stand by a suitable means such as a bolt. Has been done.

A rack 15 is formed on the outer peripheral surface of the rotary table 13, and a worm gear 16a formed on a rod 16 with a worm gear is meshed with the rack 15. The rod 16 with the worm gear has the above-mentioned plate 14a on both ends 16b and 16c sides.
A handle portion 17 for rotating the rod 16 with a worm gear is integrally formed at one end 16b thereof which is rotatably supported by 14b and particularly supported by the plate 14a.

On the other hand, above the four stands 12a to 12d, between the two stands 12a and 12c on one side and the two stands 12 on the other side as viewed in FIGS.
Plates 18a and 18b are provided between b and 12d, respectively.
And each end is fixed to each stand by a suitable means such as a bolt.

A rod 19 with a feed screw is bridged between the plates 18a and 18b facing each other, and both ends 19a and 19b of the rod 19 are rotatably supported by bearings. As is clear from FIG. 3, the feed screw rod 19 passes through the center of the rotary table 13 and is located above the cylindrical mold 1 placed on the rotary table 13.

In the rod 19 with the feed screw, a handle portion 20 for rotating the rod 19 with the feed screw is integrally formed at one end 19a supported by the plate 18b. Furthermore, this rod with feed screw 1
A feed screw portion 19c is formed on the mold 9 in a range corresponding to at least the radial length from the center to the outer periphery of the mold 1 placed on the rotary table 13.

A nut 21, which is a moving body, is screwed into the feed screw portion 19c. A rotation preventing rod 22 is provided on the outer surface of the nut 21 in the direction orthogonal to the screw axis direction.
One ends of a and 22b are connected, and the other ends thereof are supported on the frames 23a and 23b. These frames 23a and 23b are arranged between the stands 12a and 12b and between the stands 12c and 12d, respectively, and each end is fixedly attached to each stand by an appropriate means.

As a result, when the handle portion 20 of the rod 19 with the feed screw is rotated, the rotation of the nut 21 screwed into the feed screw portion 19c is prevented by the rotation preventing rod 22.
It is blocked by the contact between the end of a or 22b and the frame 23a or 23b, and moves along the rod 19 with the feed screw.

A measuring portion 24 of the laser displacement meter is suspended from the nut 21 by a suspension member 25. This laser displacement meter itself is well known, and a laser emitting section 24a and a light receiving section 24b are provided below the measuring section 24. The light receiving section 24b is a laser emitting section 24a.
The laser beam emitted from the laser beam and reflected by the bottom surface 4 of the mold 1 is received.

Next, the operation of the concrete test piece formwork bottom surface flatness measuring apparatus 10 according to the present embodiment configured as described above, in other words, the method for measuring the flatness of the concrete test piece formwork bottom surface will be described. . First, concrete test piece formwork 1 and rotary table 1
The test pieces 24 of the laser displacement meter are hung by the suspension member 25 from the nut 21 arranged on the upper part of the concrete test piece mold 1 and placed on the mold 1 with the centers thereof aligned with each other.

At this time, the measuring unit 24 of this laser displacement meter
The nut 2 beforehand so that it is located on the radially outermost side of the mold 1.
The position 1 is adjusted by rotating the rod 19 with the feed screw. After that, the laser emitting section 24 of the measuring section 24
The laser beam from a is applied to the bottom surface 4 of the mold 1 immediately below. The laser beam applied to the bottom surface 4 of the mold 1 is the bottom surface 4
Is reflected on the bottom surface 1 by the light receiving section 24b of the measuring section 24.
The reference distance S between the measurement unit 24 and the measuring unit 24 is measured.

When measuring the reference distance S between the bottom surface 1 and the measuring section 24 in this manner, the handle section 17 is rotated to rotate the rod 16 with the worm gear, and the worm gear 1 is rotated.
6a and the rack 15 mesh with each other so that the rotary table 13
To rotate. At the same time, the handle portion 20 is also rotated to rotate the rod 19 with the feed screw, and the nut 21 screwed into the feed screw portion 19c is moved straight toward the center with the help of the rotation-preventing rods 22a and 22b.

As a result, the laser beam from the measuring section 24 of the laser displacement meter is measured by a dotted line 26 in FIG.
, The bottom surface 4 of the mold 1 is continuously irradiated in a spiral shape from the outside to the center, and the reference distance S is 0.2 μm.
Measure with an accuracy of m. The reference distance data measured by the laser beam in this manner is input to the controller unit of the data capturing device (not shown).

In the concrete test piece formwork bottom surface flatness measuring device 10 of this embodiment, the measuring portion 24 of the laser displacement meter is hung in the concrete test piece formwork 1 using the linear movement nut 21, and this type is used. The rotary table 13 that supports the frame 1 is rotated by rotating the rod 16 with the worm gear, while the rod 19 with the feed screw is rotated to rotate the nut 2
1. That is, since the measuring unit 24 is moved in the radial direction, the bottom surface 4 of the mold 1 can be continuously measured in a spiral shape from the outside to the center, and as a result, a very simple structure and high accuracy can be obtained. Flatness measurement data can be obtained.

In the embodiment of the present invention described above,
Rod with worm gear 1 that rotates the rotary table 13
6 and the rotation of the feed screw rod 19 that rotates to linearly move the nut 21 which is a moving body, the handle portion 17 integrally formed at the end of each rod,
However, the present invention is not limited to this, and an electric motor or the like may be appropriately used for rotation.

[0026]

As described above, according to the concrete test piece mold bottom surface flatness measuring apparatus of the present invention, the measuring portion of the laser displacement meter suspended in the mold while rotating the mold is used. By moving in the radial direction at the same time, it is possible to continuously measure the bottom surface of the form in a spiral shape from the outside to the center, and the measuring means is a laser displacement meter, which is extremely accurate. High flatness measurement is possible.

[Brief description of drawings]

FIG. 1 is a vertical sectional view schematically showing a concrete test piece formwork bottom surface flatness measuring apparatus according to an embodiment of the present invention.

FIG. 2 is a transverse cross-sectional view of the concrete test piece formwork bottom surface flatness measuring device obtained along line 2-2 of FIG.

3 is a top view of the concrete test piece formwork bottom surface flatness measuring device shown in FIG. 1. FIG.

FIG. 4 is a cross-sectional view of the concrete test piece formwork bottom surface flatness measuring device taken along line 4-4 of FIG.

5 is a plan view showing a measurement locus of the bottom surface of the mold by the concrete test piece mold bottom flatness measuring device shown in FIG. 1. FIG.

FIG. 6 is a cross-sectional view showing a state in which the flatness of the bottom surface of the concrete test piece mold is measured using a conventional dial gauge.

FIG. 7 is a plan view showing the distribution of measurement points when measuring the flatness of the bottom surface of the concrete test piece form using a conventional dial gauge.

[Explanation of symbols]

1 Concrete Test Piece Formwork 4 Formwork Bottom 10 Concrete Testpiece Formwork Bottom Flatness Measuring Device 11 Stand 12 Ball Seat 13 Rotary Table 14a Plate 14b Plate 15 Rack 16 Rod with Worm Gear 16a Worm Gear 17 Handle 18a Plate 18b Plate 19 Rod with feed screw 20 Handle part 21 Nut 22a Rotation blocking rod 22b Rotation blocking rod 23a Frame 23b Frame 24 Laser displacement meter measuring part 24a Laser emitting part 24b Laser reflected light receiving part 25 Suspension member 26 Measurement trajectory

Claims (1)

[Claims] 1. A rotary table for mounting a bottomed tubular concrete test piece formwork, a means for rotating the rotary table, and a movement arranged above the concrete testpiece formwork on the turntable. Body, means for moving the moving body so as to traverse the upper opening through the center position of the form, and suspended from the moving body to the inside from the upper opening of the concrete test piece form It consists of a laser displacement meter having a measuring unit arranged, emits laser light from the laser emitting unit toward the bottom surface of the concrete test piece form while moving the measuring unit of the laser displacement meter by the moving body, A concrete test piece formwork bottom surface flatness measuring device characterized in that the reflected laser beam is received by a light receiving section.