JP2019144178A - Caliper for dimension measurement of enlarged diameter - Google Patents

Abstract

To provide a caliper for measuring a dimension of an enlarged diameter portion that can improve the measurement accuracy of the enlarged diameter thickness and easily measure the dimension, such as that of a T-head method rebar without requiring a manpower (by an operator alone).SOLUTION: The caliper is for measuring the dimension between an end of an object to be measured (T-head method rebar 30) and a part having a predetermined width dimension of an object to be measured, and a first contact caliper 21 with a planar portion 21d is disposed in contact with the end portion of the object to be measured in either of the main measure 2 and a slider 3, and a second contact caliper 22 is disposed in contact with a U-shaped two-legged part 22b formed in a U shape in the part having a predetermined width dimension of the object to be measured in the other, respectively.SELECTED DRAWING: Figure 1

Description

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

Generally, anchoring portions to reinforced concrete are formed at the ends of reinforcing bars embedded in reinforced concrete structures or precast concrete.
Conventionally, this fixing part has been formed by bending the end of the reinforcing bar into a U-shape or L-shape, but in recent years, in order to improve the workability of bar arrangement and concrete filling, A construction method is employed in which the diameter of the end of the reinforcing bar is increased by machining or the like, and the expanded diameter portion is used as a fixing portion. Since the cross-sectional shape along the axial direction of the reinforcing bar is T-shaped, this enlarged diameter portion is also called a T-head method reinforcing bar, which is disclosed in Patent Document 1, for example.

JP 2000-257209 A

FIG. 8 shows an example of a T-head method reinforcing bar 30, and a conical diameter-expanded portion 30 b is formed at the end of a round bar-shaped reinforcing bar body 30 a by the hot casting described above. And this conical-shaped enlarged diameter part 30b is made into a fixing part by being embed | buried in concrete.
In this T head construction method reinforcing bar 30, in order to confirm that the enlarged diameter portion 30b at the end is formed into a target shape, for example, the thickness of the enlarged diameter portion can be measured using calipers. Done.

That is, in the above-described T head construction method reinforcing bar 30, the “expanded portion thickness t” is defined. This diameter-expanded portion thickness t is a dimension between “the beginning of diameter expansion 30c” and “the bottom portion 30d of the diameter-expanded portion”.
By the way, the position of the above-described diameter expansion beginning 30c corresponds to a boundary portion that gently leads from the reinforcing bar element 30a of the round bar to the conical diameter expansion portion 30b, and the position is likely to be ambiguous. Therefore, it is determined that the initial diameter 30c is a position that is 1.2 times (1.2d) the nominal diameter d of the reinforcing bar element 30a of a round bar.

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

According to the measuring method using the two calipers shown in the first to fifth steps described above, in the first first step, the thickness of the outer measuring jaw of the first caliper is measured with the second caliper and digitally displayed. The zero point is set.
Thereby, in a 4th process, the outer side measurement of the 1st caliper is measured by measuring the dimension between the bottom part 30d of the T-head method rebar 30 as the object to be measured and the outer surface of the first caliper jaw by the second caliper. As the value obtained by subtracting the plate thickness of the jaw, the thickness t of the measured object can be obtained by digital display of the second caliper.

By the way, according to the measurement method of the above-mentioned diameter-expanded-portion thickness t using two calipers as described above, the problem of lack of measurement accuracy and the workability of measurement are poor from the following viewpoints. Have a problem.
1. It is necessary to measure the plate thickness of the first caliper's jaw in advance, and in this measurement, the inclination of the second caliper with respect to the plate thickness direction of the first caliper's jaw causes an inclination of the first caliper's jaw. Thickness measurement error is likely to occur. Therefore, careful measurement work by skilled workers is required.
2. It is necessary to set the distance between the outer measurement jaws of the first caliper to 1.2 d for each reinforcing bar size d as a measurement object, and the setting accuracy of the first caliper at this time is the diameter of the expanded portion thickness t. Affects measurement results.
3. Since the operation of the first and second calipers and the gripping of the measurement object (reinforcing bar 30) are also required, the measurement work alone is difficult.

  Therefore, the main problem to be solved by the present invention is that by using one caliper, it becomes possible to measure the diameter t of the enlarged portion of the above-mentioned T-head method rebar and improve the measurement accuracy. In addition, it is possible to provide a caliper for measuring the diameter of the enlarged diameter part which can be easily measured without requiring human labor (one person alone).

  The caliper for measuring the size of the enlarged diameter portion according to the present invention, which has been made to solve the above-described problems, includes an end portion of the measurement object (the bottom portion 30d of the enlarged diameter portion) and a predetermined width dimension of the measurement object. A caliper that measures the dimension between two points between the part having the diameter (the diameter expansion beginning 30c), and a flat part that contacts the end of the object to be measured is provided on one of the main scale and the slider. A first contact caliper provided, and a second contact that is formed in a U-shape on each of the other and the U-shaped legs contact each of the parts having a predetermined width dimension of the object to be measured. A 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 the other jaw. It is desirable that

  In a preferred embodiment, the second contact caliper is detachably attached to the other jaw via a liner member, and the liner member has a cut groove formed at an end thereof. 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 size of the enlarged-diameter portion according to the present invention is a reinforcing bar with a fixing portion embedded in a concrete structure and having a cross-sectional shape along the axial direction formed into a T-shape as a fixing portion to the concrete. Can be suitably used for measuring the dimension of the enlarged diameter portion.

According to the above-described caliper for measuring the diameter of the enlarged diameter portion according to the present invention, the distance between both leg portions of the second contact caliper formed in the U-shape is the size of the diameter of the T head construction method reinforcing bar 30 starting 30c (described above). The one corresponding to 1.2d) is used.
Then, the rod-shaped reinforcing bar body 30a of the T head method reinforcing bar 30 is inserted into the U-shaped groove of the second contact caliper, and the U-shaped leg portions have predetermined width dimensions (beginning of diameter expansion 30c). The diameter of the expanded portion is measured by bringing the flat portion of the first contact caliper into contact with the end of the object to be measured (the bottom portion 30d of the expanded portion) and measuring the dimension between the two points. t can be obtained immediately.

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

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 a part of the caliper in cross section. It is a bottom view of the caliper. It is a side view of the caliper. The single-piece | unit structure of the 1st contact caliper attached to the jaw of the same caliper is shown, (A) is a top view, (B) is a front view, (C) is a side view. The single-piece | unit structure of the 2nd contact caliper attached to the jaw of the same caliper is shown, (A) is a top view, (B) is a front view, (C) is a side view. The single-piece | unit structure of the liner member interposed between a 2nd contact caliper and a jaw is shown, (A) is a top view, (B) is a front view, (C) is a bottom view, (D) is a side view. . It is a front view of the T head method rebar as a to-be-measured object.

A caliper for measuring the dimension of the enlarged diameter portion according to the present invention will be described based on the embodiment shown in the drawings.
1 to 4 show the overall configuration of the caliper, and the caliper shown in this example is preferably a commercially available digital display caliper capable of displaying measured values on a liquid crystal display screen.
A first contact caliper and a second contact caliper are detachably attached to each of the caliper outer measurement jaws. In other words, the first contact caliper and the second contact caliper are configured to be attached as adapters to the caliper outer measurement jaw.

As is well known, a caliper main body 1 shown in the figure has a slider 3 attached to a main scale 2 so as to be slidable along the longitudinal direction of the main scale 2.
A pair of outer measuring jaws 4 and 5 are formed integrally with the main scale 2 and the slider 3, respectively, in one direction orthogonal to the longitudinal direction of the main scale 2. A pair of inner measuring jaws 6 and 7 are integrally formed with the main scale 2 and the slider 3 toward the other side perpendicular to the longitudinal direction of the main scale 2.

In addition, the member shown with the code | symbol 8 which protrudes from the main scale 2 is a depth bar which measures the depth of the to-be-measured object in which the base end part was attached to the said slider 3. FIG.
Further, a case 11 having a liquid crystal display unit 10 as shown in FIG. 1 is attached to the slider 3, and a part of the case 11 includes a power on / off button 12 of the liquid crystal display unit 10 and a measured value. A digital display zero point setting button 13 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, a second contact caliper 22 is detachably attached to the jaw 4 formed on the main scale 2 through a liner member 23 as shown in FIG. 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.

The first contact caliper 21 attached to the slider-side outer measuring jaw 5 has an inverted T-shape (convex shape) as a whole as shown in FIG. In contrast, the upright portion 21b is integrally formed of a metal material so as to be orthogonal.
A rib-shaped protrusion 21c is formed along the corner portion at the bottom of the base 21a. The rib-shaped protrusion 21c serves as a guide portion along the outer measurement surface of the jaw 5. It is arranged to be located. 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 a flat portion 21d, and this flat portion 21d is the end portion of the object to be measured (the diameter-expanded portion of the T head method reinforcing bar 30). It will be the surface in contact with the bottom 30d).
Note that reference numeral 21 e shown in FIG. 5 is a fastening hole of the bolt 25.

  On the other hand, as described above, the second contact caliper 22 is attached to the outer measurement jaw 4 on the main scale side via the liner member 23. As shown in 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 formed with the central connecting portion 22a from a metal material. And the inner surface of each leg part 22b which opposes is made into a mutually parallel surface, and the U-shaped groove 22c is formed.

Positioning projections 22d are 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 respect to a liner member 23 described below, and functions so that the second contact caliper 22 can be slidably attached to and removed 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.
In addition, the code | symbol 22e shown in FIG. 6 is a fastening hole of the above-mentioned bolt 27 with a knob for attaching the 2nd contact caliper 22 to the liner member 23 mentioned later so that attachment or detachment is possible.

FIG. 7 shows the liner member 23 attached to the outer measurement jaw 4 on the main scale side, and the second contact caliper 22 is detachably attached through the liner member 23 as described above.
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. The rib-like protrusion 23a serves as a guide part, and is arranged so that the protrusion 23a is positioned along the outer measurement surface of the jaw 4 indicated by a virtual line in FIG. In this state, the liner member 23 is attached to the jaw 4 with bolts 26.
Note that reference numeral 23b shown in FIG.

Further, the liner member 23 is further formed with a rectangular groove portion 23 c from the center portion to the end portion of the liner member 23. A positioning protrusion 22 d formed on the second contact caliper 22 is inserted into the groove 23 c and functions to position the second contact caliper 22 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 fastening state of the bolt 27 with the knob is slightly loosened, and the second contact caliper 22 is slid toward the end of the cut groove 23d of the liner member 23. Thus, the second contact caliper 22 can be detached from the liner member 23 with the knob-attached bolt 27 screwed together.
This sliding operation is performed between the rectangular groove 23c of the liner member 23 and the positioning protrusion 22d of the second contact caliper 22 inserted into the groove 23c. Therefore, in order to mount the second contact caliper 22 on the liner member 23, an operation opposite to that described above may be performed, and the mounting and dismounting operation of the second contact caliper 22 with respect to the liner member 23 is performed by the notch groove of the liner member 23. This can be realized by slightly loosening the bolt 27 with the knob inserted into the 23d.

FIGS. 1 to 4 show a state in which the diameter-expanded portion thickness t for the T-head method reinforcing bar 30 (shown in phantom) described above is measured as an object to be measured.
That is, the bottom 30d of the T head construction method reinforcing bar 30 is arranged toward the standing part 21b of the first contact caliper 21, and the reinforcing bar element 30a is accommodated in the U-shaped groove 22c of the second contact caliper 22. The expanded portion thickness t is measured.

  In this case, the U-shaped second contact caliper 22 having both leg portions 22b in which the distance between the leg portions 22b coincides with the diameter of the T-head method reinforcing bar 30 including the first 30c (1.2d described above) is used. As a result, the second contact caliper 22 is brought into contact with the diameter expansion beginning 30c, and the flat portion 21d of the first contact caliper 21 is brought into contact with the bottom portion 30d of the diameter expansion portion to measure the dimension between the two points. As a result, the diameter-expanded portion thickness t can be obtained immediately.

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

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

Moreover, in embodiment described above, the structure which attached the 1st contact caliper 21 and the 2nd contact caliper 22 with respect to the outer side measuring jaw of a caliper main body using a general digital display type caliper, respectively. Adopted.
However, when a caliper is used exclusively for a specific object to be measured, the first contact caliper and the second contact caliper can each be a caliper formed integrally with a jaw. Even in the caliper for measuring the dimension of the enlarged-diameter portion having such a configuration, it is possible to obtain the same effect as that of the above-described embodiment.

1 caliper body 2 main scale 3 slider 4 outer measurement jaw (main scale side)
5 External measurement jaw (slider side)
6 Jaw for inner measurement (main scale side)
7 Inner measuring jaw (slider side)
8 Depth Bar 10 Liquid Crystal Display 11 Case 12 Power On / Off Button 13 Zero Point Setting Button 21 First Contact Caliper 21a Base Part 21b Standing Part 21c Projection Part (Guide Part)
21d Plane portion 21e Bolt fastening hole 22 Second contact caliper 22a Center connecting portion 22b Leg portion 22c U-shaped groove 22d Positioning projection portion 22e Bolt fastening hole with knob 23 Liner member 23a Projection portion (guide portion)
23b Bolt fastening hole 23c Groove 23d Cut groove 25 Bolt (first contact caliper fastening bolt)
26 Bolt (Liner member fastening bolt)
27 Bolt with Knob 30 T Head Method Rebar (Measurement Object)
30a Reinforcing bar element 30b Expanded portion 30c Beginning of expanded diameter (part having a predetermined width dimension)
30d Bottom of the expanded part (end of the object to be measured)
t Expanded part thickness

Claims (4)

A caliper for measuring a dimension between two points between an end of the object to be measured and a portion having a predetermined width dimension of the object to be measured,
A first contact caliper having a flat portion that contacts the end of the object to be measured is disposed on one of the main scale and the slider, and the other is formed in a U shape and has a U shape. A caliper for measuring the size of the enlarged diameter portion, wherein the second contact caliper is disposed so that both leg portions are in contact with portions having a predetermined width 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 the other jaw. The caliper for measuring the dimension of the enlarged diameter portion according to claim 1. The second contact caliper is detachably attached to the other jaw via a liner member,
The liner member is formed with a notch groove at an end thereof and attached to the jaw by a bolt, and the second contact caliper is a liner member by a bolt with a knob inserted into the notch groove of the liner member. The caliper for measuring the dimension of the enlarged diameter portion according to claim 2, wherein the vernier caliper is attached to.   2. The measurement object is a reinforcing bar with a fixing part, which is embedded in a concrete structure and has a T-shaped cross section along the axial direction as a fixing part to the concrete. The caliper for measuring the dimension of the enlarged diameter portion described in 1.

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