JP6991888B2 - Nogisu for measuring the dimensions of the enlarged diameter part - Google Patents

Description

The present invention relates to, for example, a caliper for measuring the size of a diameter-expanded portion suitable for measuring the dimension of a diameter-expanded portion formed at an end of a reinforcing bar embedded in a reinforced concrete structure.

A fixing portion to the reinforced concrete is generally formed at the end of the reinforcing bar buried in the reinforced concrete structure, precast concrete, or the like.
Conventionally, this fixing portion is formed by bending the end of the reinforcing bar into a U-shape or an L-shape, but nowadays, in order to improve the workability of the reinforcing bar arrangement and the filling property of the concrete, hot casting is performed. A construction method is adopted in which the end portion of the reinforcing bar is expanded by processing or the like and the enlarged diameter portion is used as a fixing portion. This enlarged diameter portion is also called a T-head construction method reinforcing bar because the cross-sectional shape of the reinforcing bar along the axial direction is T-shaped, and this is disclosed in, for example, Patent Document 1.

Japanese Unexamined Patent Publication No. 2000-257209

FIG. 8 shows an example of the T-head construction method reinforcing bar 30, and a conical enlarged diameter portion 30b is formed at the end of the round bar-shaped reinforcing bar body 30a by the hot casting process described above. Then, the conical enlarged diameter portion 30b is embedded in the concrete to form a fixing portion.
In this T-head construction method reinforcing bar 30, in order to confirm that the enlarged diameter portion 30b at the end thereof is formed into a desired shape, for example, the thickness of the enlarged diameter portion can be measured using a caliper. Will be done.

That is, in the above-mentioned T-head construction method reinforcing bar 30, the "diameter-enlarged portion thickness t" is specified. The diameter-expanded portion thickness t is a dimension between the “diameter-expanded portion 30c” and the “diameter-expanded portion bottom portion 30d”.
By the way, the position of the diameter-expanding beginning 30c described above corresponds to the boundary portion from the reinforcing bar body 30a of the round bar gently connected to the diameter-expanding portion 30b having a conical shape, and the position tends to be ambiguous. Therefore, it is determined that the diameter expansion starting 30c is 1.2 times (1.2d) the nominal diameter d of the reinforcing bar element body 30a of the round bar.

Therefore, when measuring the diameter-expanded portion thickness t of the T-head construction method reinforcing bar 30 with a caliper, prepare two calipers and obtain the diameter-expanded portion thickness t in the order shown below. Is done.
First step: Both sides of the outer measurement jaw of the first caliper in the plate thickness direction are sandwiched between the outer measurement jaws of the second caliper (digital display type caliper), and the zero point of the digital display of the second caliper is set. ..
Second step: The distance between the outer measuring jaws of the first caliper is opened to 1.2 times the nominal diameter d of the object to be measured (T-head construction method reinforcing bar 30), and the movement of the slider is fixed with a lock screw.
Third step: The outer measuring jaw of the first caliper opened 1.2 times the nominal diameter d described above is applied to 30c at the beginning of the diameter expansion of the object to be measured.
Fourth step: The bottom 30d of the object to be measured and the outer surface of the outer measurement jaw of the first caliper are sandwiched between the outer measurement jaws of the second caliper, and the digital display value of the second caliper is displayed in the X direction (rib direction). ) Record as the diameter expansion part thickness t.
Fifth step: At a position where the reinforcing bar element 30a is rotated 90 degrees around the axis, the first to fourth steps are repeated, and the value of the digital display of the second caliper is changed in the Y direction (rib vertical direction). Record as t.

According to the measurement method using the two calipers shown in the first to fifth steps described above, in the first step, the plate thickness of the outer measuring jaw of the first caliper is measured by the second caliper and displayed digitally. Zero point is set.
Thereby, in the fourth step, the outside measurement of the first caliper is performed by measuring the dimension between the bottom portion 30d of the T-head construction method reinforcing bar 30 as the object to be measured and the outer surface of the jaw of the first caliper by the second caliper. The diameter-enlarged portion thickness t of the object to be measured can be obtained by digitally displaying the second caliper as a value obtained by subtracting the plate thickness of the jaw.

By the way, according to the above-mentioned method for measuring the diameter-enlarged portion thickness t using two calipers as described above, there is a problem that the measurement accuracy is insufficient and the measurement workability is poor from the following viewpoints. I have a problem.
1. 1. It is necessary to measure the plate thickness of the first caliper in advance, and in this measurement, the second caliper is tilted with respect to the plate thickness direction of the first caliper, so that the thickness of the first caliper is measured. Plate thickness measurement error is likely to occur. Therefore, careful measurement work by a skilled person is required.
2. 2. It is necessary to set the interval of the outer measurement jaws of the first caliper to 1.2d for each reinforcing bar size d as a measurement symmetry object, and the setting accuracy of the first caliper at this time is the diameter expansion portion thickness t. Affects measurement results.
3. 3. Since it is necessary to operate the first and second calipers and to grasp the object to be measured (reinforcing bar 30), it is difficult to perform the measurement work by one person.

Therefore, the main problem to be solved by the present invention is to make it possible to measure the thickness t of the enlarged diameter portion of the T-head method reinforcing bar and the like described above by using one caliper, and to improve the measurement accuracy. It is an object of the present invention to provide a caliper for measuring the size of the enlarged diameter portion, which can easily measure the thickness t of the enlarged diameter portion without requiring manpower (one measurer).

The Nogis for measuring the dimensions of the enlarged diameter portion according to the present invention, which has been made to solve the above-mentioned problems, has the end portion of the object to be measured (the bottom portion 30d of the enlarged diameter portion) and a predetermined width dimension of the object to be measured. It is a nogis that measures the dimension between two points between the part having the diameter (the first 30c of the diameter expansion), and has a flat surface portion in contact with the end portion of the object to be measured on either the main scale or the slider. A first contact caliper provided is arranged, and on either of the above, both U-shaped legs are in contact with a portion having a predetermined width dimension of the object to be measured. The feature is that the caliper is arranged.

In this case, the first contact caliper is detachably attached to one of the main scale and the slider, and the second contact caliper is detachably attached to any one of the jaws. It is desirable that it is.

In a preferred embodiment, the second contact caliper is detachably attached to the other jaw via the liner member, and the liner member is formed with a notch groove at an end and has a notch groove. The second contact caliper is attached to the jaw by a bolt, and the second contact caliper is attached to the liner member by a bolt with a knob inserted into the notch groove of the liner member.

On the other hand, the caliper for measuring the dimensions of the enlarged diameter portion according to the present invention is a reinforcing bar with a fixing portion which is embedded in a concrete structure and has a T-shaped cross section along the axial direction as a fixing portion to the concrete. Can be suitably used for measuring the dimensions of the enlarged diameter portion of the object to be measured.

According to the caliper for measuring the dimension of the enlarged diameter portion according to the present invention described above, the distance between both legs of the second contact caliper formed in a U shape is the dimension of 30c at the beginning of the enlarged diameter of the T-head method reinforcing bar 30 (described above). Those that match 1.2d) are used.
Then, a round bar-shaped reinforcing bar element body 30a of the T-head construction method reinforcing bar 30 is inserted into the U-shaped groove of the second contact caliper, and a portion having a predetermined width dimension on both U-shaped legs (diameter expansion beginning 30c). The thickness of the enlarged diameter portion is measured by contacting the flat surface portion of the first contact caliper with the end portion (bottom 30d of the enlarged diameter portion) of the object to be measured and measuring the dimension between the two points. t can be obtained immediately.

In this case, by using a digital display type caliper and setting the zero point of the caliper in a state where the first contact caliper and the second contact caliper are in contact with each other in advance, the diameter of the enlarged diameter portion is increased in the digital display unit. The measured value of t can be displayed as it is.
Therefore, according to the caliper for measuring the dimensions of the enlarged diameter portion according to the present invention, it is possible to measure the thickness t of the enlarged diameter portion of the above-mentioned T-head construction method reinforcing bar or the like by using one caliper, and the measurement accuracy is improved. Can contribute to making it. In addition, it is possible for one measurer to easily measure the diameter-enlarged portion thickness t without requiring any other manpower.

It is a top view of the caliper for dimension measurement of the enlarged diameter part which concerns on this invention. It is the front view which showed the part of the caliper in the cross section. It is a bottom view of the same caliper. It is a side view of the caliper. The unit configuration of the first contact caliper attached to the jaw of the caliper is shown, (A) is a top view, (B) is a front view, and (C) is a side view. The unit configuration of the second contact caliper attached to the jaw of the caliper is shown, (A) is a top view, (B) is a front view, and (C) is a side view. A single configuration of the liner member interposed between the second contact caliper and the jaw is shown, (A) is a top view, (B) is a front view, (C) is a bottom view, and (D) is a side view. .. It is a front view of the T head construction method reinforcing bar as an object to be measured.

The caliper for measuring the dimensions of the enlarged diameter portion according to the present invention will be described based on the embodiment shown in the figure.
1 to 4 show the overall configuration of the caliper, and the caliper shown in this example preferably uses a commercially available digital display type caliper capable of displaying a measured value on a liquid crystal display screen.
Then, the first contact caliper and the second contact caliper are detachably attached to each of the outer measurement jaws of the caliper. That is, the first contact caliper and the second contact caliper are configured to be attached as adapters to the outside measurement jaw of Nogis.

As is well known, in the Nogisu main body 1 shown in the figure, a slider 3 is slidably attached to the main scale 2 along the longitudinal direction of the main scale 2.
Then, a pair of outer measuring jaws 4 and 5 are integrally formed on the main scale 2 and the slider 3, respectively, toward one side orthogonal to the longitudinal direction of the main scale 2. Further, a pair of inner measuring jaws 6 and 7 are integrally formed on the main scale 2 and the slider 3, respectively, toward the other side orthogonal to the longitudinal direction of the main scale 2.

The member indicated by reference numeral 8 protruding from the main scale 2 is a depth bar whose base end portion is attached to the slider 3 to measure the depth of the object to be measured.
Further, as shown in FIG. 1, a case 11 provided with a liquid crystal display unit 10 is attached to the slider 3, and a power on / off button 12 of the liquid crystal display unit 10 and a measured value are attached to a part of the case 11. The zero point setting button 13 of the digital display of is arranged.

As shown in FIG. 1, a first contact caliper 21 is detachably attached to the jaw 5 formed on the slider 3 by a pair of bolts 25. The detailed configuration of the first contact caliper 21 will be described later with reference to FIG.
Further, as shown in FIG. 1, a second contact caliper 22 is detachably attached to the jaw 4 formed on the main scale 2 via a liner member 23. That is, the liner member 23 is attached to the jaw 4 by the bolt 26, and the second contact caliper 22 is detachably attached to the liner member 23 by the bolt 27 with a knob.
The detailed configuration of the second contact caliper 22 will be described later with reference to FIG. 6, and the detailed configuration of the liner member 23 will be described later with reference to FIG. 7.

The first contact caliper 21 attached to the outside measurement jaw 5 on the slider side described above has an inverted T-shape (convex shape) as a whole, as shown in a single configuration in FIG. 5, and has a base portion 21a. It is integrally molded with a metal material so that the upright portion 21b is orthogonal to the above.
A rib-shaped protrusion 21c is formed on the bottom of the base portion 21a along the corner portion, and the rib-shaped protrusion 21c serves as a guide portion along the outer measurement surface of the jaw 5. Arranged to be positioned. In this state, the first contact caliper 21 is attached to the jaw 5 by two bolts 25.
The surface of the upright portion 21b on the side where the rib-shaped protrusion 21c is formed is formed on a flat surface portion 21d, and this flat surface portion 21d is the end portion of the object to be measured (the enlarged diameter portion of the T-head construction method reinforcing bar 30). It is a surface that comes into contact with the bottom portion 30d).
Reference numeral 21e shown in FIG. 5 is a fastening hole for the bolt 25.

On the other hand, as described above, the second contact caliper 22 is attached to the outer measuring jaw 4 on the main scale side via the liner member 23. As shown in the single configuration of FIG. 6, the second contact caliper 22 has a U-shape (concave shape) as a whole, and a pair of leg portions 22b are provided on both sides of the second contact caliper 22 via the central connecting portion 22a. It is integrally molded with the central connecting portion 22a by a metal material. The inner surfaces of the opposing legs 22b are parallel to each other to form a U-shaped groove 22c.

A positioning protrusion 22d is formed on the back surface of the central connecting portion 22a of the second contact caliper 22 along the longitudinal direction of the central connecting portion 22a. The protrusion 22d is positioned with the liner member 23 described below, and functions so that the second contact caliper 22 can be slidably attached to and detached from the liner member 23.
Therefore, the protrusion 22d is formed so as to have the same width dimension along the longitudinal direction from the substantially central portion to the end portion of the central connecting portion 22a.
Reference numeral 22e shown in FIG. 6 is a fastening hole for the bolt with a knob 27 for attaching and detaching the second contact caliper 22 to the liner member 23 described later.

FIG. 7 shows a liner member 23 attached to the outer measuring jaw 4 on the main scale side, and as described above, the second contact caliper 22 is detachably attached via the liner member 23.
The liner member 23 is made of a rectangular parallelepiped metal material, and a rib-shaped protrusion 23a is formed along one side in the longitudinal direction thereof. The rib-shaped protrusion 23a serves as a guide portion and is arranged so that the protrusion 23a is located along the outer measurement surface of the jaw 4 shown by the virtual line in FIG. 7 (A). In this state, the liner member 23 is attached to the jaw 4 by a bolt 26.
Reference numeral 23b shown in FIG. 7 is a fastening hole for the bolt 26.

Further, the liner member 23 is further formed with a rectangular groove portion 23c from the central portion to the end portion of the liner member 23. A positioning protrusion 22d formed on the second contact caliper 22 is inserted into the groove 23c, and functions so that the second contact caliper 22 is positioned with respect to the liner member 23.
A notch groove 23d is formed at the end of the groove 23c, and the second contact caliper 22 is inserted into the notch groove 23d of the liner member 23 by, for example, a bolt 27 with a knob shown in FIG. It is attached to the liner member 23.

When removing the second contact caliper 22 from the liner member 23, the tightened state of the bolt with knob 27 described above is slightly loosened, and the second contact caliper 22 is slid toward the end of the notch groove 23d of the liner member 23. As a result, the second contact caliper 22 can be detached from the liner member 23 in a state where the bolt with knob 27 is screwed.
This sliding operation is performed between the rectangular groove portion 23c of the liner member 23 and the positioning protrusion 22d of the second contact caliper 22 inserted into the groove portion 23c. Therefore, in order to attach the second contact caliper 22 to the liner member 23, the operation reverse to the above may be performed, and the operation of attaching and detaching the second contact caliper 22 to the liner member 23 is the cut groove of the liner member 23. This can be achieved by slightly loosening the knob-attached bolt 27 inserted through 23d.

1 to 4 show a state in which the diameter-enlarged portion thickness t is measured for the T-head construction method reinforcing bar 30 (indicated by a virtual line) described at the beginning as the object to be measured.
That is, the bottom portion 30d of the T-head construction method reinforcing bar 30 is arranged toward the upright portion 21b of the first contact caliper 21, and the reinforcing bar element body 30a is housed in the U-shaped groove 22c of the second contact caliper 22. The enlarged diameter portion thickness t is measured.

In this case, the U-shaped second contact caliper 22 is used so that the distance between the legs 22b matches the size of the T-head construction method reinforcing bar 30 at the beginning of the diameter expansion of 30c (1.2d described above). As a result, the second contact caliper 22 is brought into contact with the diameter-expanded portion 30c, and the flat surface portion 21d of the first contact caliper 21 is brought into contact with the bottom portion 30d of the diameter-expanded portion, and the dimension between the two points is measured. Therefore, the diameter-expanded portion thickness t can be obtained immediately.

Therefore, according to this embodiment, a plurality of types of second contact calipers 22 having a distance between the leg portions 22b corresponding to the above-mentioned 1.2d are prepared according to the type of the T-head construction method reinforcing bar 30 to be measured. By replacing these with the liner member 23 described above, it becomes possible to easily measure the diameter-enlarged portion thickness t according to the type of each reinforcing bar.
As described above, the replacement of the second contact caliper 22 with respect to the liner member 23 is extremely easy, which makes it possible to efficiently obtain measurement results in response to various types of objects to be measured.

In the embodiment described above, the first contact caliper 21 is attached to the jaw 5 on the slider side, and the second contact caliper 22 is attached to the jaw 4 on the main scale side via the liner member 23. Although the configuration is adopted, the arrangement of the first and second contact calipers 21 and 22 can also adopt a configuration in which they are interchanged with each other.

Further, in the embodiment described above, a configuration in which the first contact caliper 21 and the second contact caliper 22 are attached to the outside measurement jaw of the caliper body by using a general digital display type caliper is configured. It is adopted.
However, in the case of a caliper having a form exclusively used for a specific object to be measured, it is also possible to use the first contact caliper and the second contact caliper as a caliper integrally formed with a jaw. Even in the caliper for measuring the dimensions of the enlarged diameter portion in such a form, the same effect as that of the above-described embodiment can be obtained.

1 Nogisu main body 2 ulna 3 slider 4 outside measurement jaw (main ulna side)
5 Outside measurement jaw (slider side)
6 Inside measurement jaw (main scale side)
7 Inside measurement jaw (slider side)
8 Depth bar 10 Liquid crystal display 11 Case 12 Power on / off button 13 Zero point setting button 21 1st contact caliper 21a Base 21b Standing 21c Projection (guide)
21d Flat surface 21e Bolt fastening hole 22 Second contact caliper 22a Central connecting portion 22b Leg 22c U-shaped groove 22d Positioning protrusion 22e Bolt fastening hole with knob 23 Liner member 23a Protrusion (guide)
23b Bolt fastening hole 23c Groove 23d Notch groove 25 Bolt (1st contact caliper fastening bolt)
26 bolts (liner member fastening bolts)
27 Bolt with knob 30 T-head construction method Reinforcing bar (measured object)
30a Reinforcing bar element 30b Diameter expansion part 30c Diameter expansion beginning (part having a predetermined width dimension)
30d Bottom of the enlarged diameter part (end of the object to be measured)
t Enlarged diameter part thickness

Claims (4)

A caliper that measures the dimension between two points between the end of the object to be measured and the portion of the object to be measured having a predetermined width dimension.
A first contact caliper having a flat surface portion in contact with the end portion of the object to be measured is arranged on either one of the main scale and the slider, and a U-shape is formed on one of the other ones. A caliper for measuring the dimensions of an enlarged diameter portion, wherein a second contact caliper is arranged in which both legs are in contact with a portion having a predetermined width dimension of the object to be measured. The first contact caliper is detachably attached to one of the main scale and the slider, and the second contact caliper is detachably attached to any one of the jaws. The caliper for measuring the dimensions of the enlarged diameter portion according to claim 1. The second contact caliper is detachably attached to any one of the jaws via a liner member.
The liner member has a notch groove formed at an end thereof and is attached to the jaw by a bolt, and the second contact caliper is provided by a bolt with a knob inserted into the notch groove of the liner member. The caliper for measuring the dimensions of the enlarged diameter portion according to claim 2, wherein the caliper is attached to. The first aspect of the present invention is that the object to be measured is a reinforcing bar with a fixing portion which is embedded in a concrete structure and has a cross-sectional shape along the axial direction formed into a T shape as a fixing portion to the concrete. Nogisu for measuring the dimensions of the enlarged diameter part described in.

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