JPH0622903U - Crack behavior stability measuring instrument - Google Patents

Abstract

(57) [Summary] [Objective] The present invention relates to a crack behavior stability measuring instrument for concrete structures. Fixed on the wall of a concrete structure with cracks that require measurement,
It aims to measure the delicate behavior of concrete by expressing the movement of cracks on a scale. [Structure] A right scale portion 2 and a left scale portion 3 configured to be movable back and forth are provided with a vernier scale 2D and a main scale 3D, respectively, facing each other, and further, a right scale portion 2 and a left scale portion. The right leg 2E and the left leg 3 can be changed in angle to 3
E and E are provided respectively.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 This proposal relates to a crack behavior stability measuring instrument for concrete structures.

[0002]

[Prior art]

 Conventionally, this kind of thing is as follows. The investigation of cracks in a concrete structure is carried out by determining whether the behavior of the cracks is stable or fluctuating, that is, whether the cracks are active or inactive, pursuing the cause of the cracks and determining the repair method, or the structure. It is very important because it becomes an indispensable item for estimating the existence of defects in objects.

Conventionally, visual inspection is generally used as a method for investigating cracks. The method is a loupe having a graduation mark of about 1/20 mm, or a wide variety of lines with a width of 0.05 mm to 2.0 mm. There is a method of measuring the width of the crack by comparing the crack scale marked with a pattern on the crack, and the movement of the crack was confirmed by the difference in the values measured at regular intervals. However, in the above method, the subjective visual element is strong and an error is likely to occur at the individual level. In addition, there are various cases of cracking behavior, such as lateral expansion and contraction, up and down acting like shear, and movement due to flexure of concrete, so it is difficult to conduct an accurate survey at present.

[0004]

[Problems to be solved by the device]

 The conventional techniques described above have the following problems. 1. There is an error in the numerical values because minute movements are visually measured using a crack scale and loupe on a regular basis. 2. At the time of measurement, the crack width can be measured, but it cannot be measured for complex movements (three-dimensional movement such as displacement and flexure).

The present application has been made in view of such problems of the conventional technology, and an object of the present application is to provide a device capable of solving the above problems.

[0006]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention is as follows. That is, the one of the present application is composed of a right side scale portion 2 and a left side scale portion 3, and the right side scale portion 2 is provided with a right side base portion 2A of a front square shape and a left side lower portion of the right side base portion which projects toward the left side. The vernier scale 2B, the dovetail groove 2C formed in the lower surface of the vernier scale in the left-right direction, the vernier scale 2D formed on the upper side of the surface of the vernier scale 2B, and the right base 2A. The right leg 2E and the right leg 2E are configured such that the right leg 2E can be freely changed in angle like a universal joint with respect to the right base 2A, and the left scale 3 is a front square left. The base 3A, the dovetail ridge 3B protruding rightward from the lower right half of the left base, and the right upper half of the right base 3A of the left base 3A. Main scale body 3C, main scale scale 3D formed on the lower surface of the main scale body 3C, and left leg portion 3E provided on the left base portion 3A The left leg 3E is configured such that the angle can be freely changed like a universal joint with respect to the left base 3A, and the right scale 2 and the left scale 3 are the right scale 2 side. The dovetail groove 2C and the dovetail groove ridge 3B on the left side scale 3 side are slidably fitted, and the vernier scale 2D of the vernier scale 2B and the main scale graduation 3D of the main scale 3C are joined together. It is a crack behavior stability measuring instrument configured to face each other.

In this case, the adhesive 2E3 is applied to the lower surface of the disk-shaped body 2E21 in the right leg 2E, and the adhesive 3E3 is applied to the lower surface of the disk-shaped body 3E21 in the left lateral scale 3. be able to. Further, the scale 2E23 may be formed on the outer periphery of the upper surface of the short column portion 2E22 in the right leg 2E, and the scale 3E23 may be formed on the outer periphery of the upper surface of the short column portion 3E22 in the left lateral scale portion 3.

[0008]

【Example】

 Examples will be described with reference to the drawings. Reference numeral 1 is a crack behavior stability measuring instrument of the present invention, which is composed of a right side scale portion 2 and a left side scale portion 3. The material of this crack behavior stability measuring device is metal, bamboo, plastic, etc.

The right scale 2 has a front right base 2A, a vernier body 2B protruding leftward from the lower half of the left side of the right base, and a left and right side of the lower surface of the vernier body. It is composed of a carved dovetail groove 2C, a vernier scale 2D formed on the upper surface of the vernier scale body 2B, and a right leg portion 2E provided at the center of the right base portion 2A. The right leg portion 2E includes a receiving hole 2E1 formed in the right base portion 2A and a leg body 2E2 attached to the receiving hole. The leg body 2E2 includes a disc-shaped body 2E21 and an upper surface of the disc-shaped body. It is composed of a short column portion 2E22 protruding in the center, and the short column portion is fitted into the receiving hole 2E1 in a spherical pair state. Therefore, the angle of the right leg 2E with respect to the right base 2A can be automatically changed like a universal joint. A scale 2E23 is formed on the outer periphery of the upper surface of the short column portion 2E22.

In addition, the left scale part 3 is a front square left base part 3A, a dovetail groove projection 3B protruding rightward from the lower half of the right side of the left base part, and the left base part 3A. Main scale 3C protruding rightward in the upper half of the right side of the main scale, main scale 3D formed on the lower surface of the main scale 3C, and left leg 3E provided on the left base 3A. It consists of The left leg portion 3E includes a receiving hole 3E1 formed in the left base portion 3A and a leg body 3E2 attached to the receiving hole. The leg body 3E2 includes a disc-shaped body 3E21 and an upper surface of the disc-shaped body. It is composed of a short column portion 3E22 protruding from the center, and the short column portion is fitted into the receiving hole 3E1 in a spherical pair state. Therefore, the angle of the left leg 3E with respect to the left base 3A can be automatically changed like a universal joint. A scale 3E23 is formed on the outer periphery of the upper surface of the short column portion 3E22.

Reference numeral 2E3 is an adhesive applied to the lower surface of the disk-shaped body 2E21, and 2E4 is a release paper laminated on the surface of this adhesive. 3E3 is an adhesive applied to the lower surface of the disk-shaped body 3E21, and 3E4 is a release paper laminated on the surface of this adhesive. In this way, it is convenient to pre-apply the adhesive without the need to separately prepare an adhesive or an adhesive tape when using the present invention by adhering it to the wall surface of a concrete structure. The right-side scale portion 2 and the left-side scale portion 3 are slidably engaged with the dovetail groove 2C on the right-side scale portion 2 side and the dovetail groove projection 3B on the left-side scale portion 3 side, and the vernier scale. The vernier scale 2D of the body 2B and the main scale 3D of the main scale body 3C are configured to face each other.

The main scale graduation 3D and the sub-scale graduation 2D are formed under the following conditions. The main scale 3D is engraved in units of 1 mm, and a numerical value in units of 1 mm can be measured at the position of the arrow 2D3 of the sub-scale 2D. A number 3D1 is attached to the main scale scale 3D. The vernier scale 2D is graduated in 0.95 mm units, and the line of the main scale 3D and the line of the vernier scale 2D are aligned every 0.05 mm between the main scale and the vernier scale. That is, by reading the position where the line of the main scale graduation 3D and the line of the sub-scale graduation 2D match, the numerical value in 0.05 mm unit can be measured. Therefore, by sticking the measuring instrument of the present invention so as to straddle over the crack 4A to be measured and periodically measuring the deviation between the main scale body and the vice scale body of the measuring instrument due to the movement of the crack, it is possible to determine the behavior of the crack. Enables reliable tracking. (See Figure 7)

The number 2D1 attached to the vernier scale 2D is a scale to be used when the crack to be measured spreads. When the position of the arrow on the vernier scale is on the right side of the 0 position on the main scale 3D, −0. The crack spread can be measured in units of .05 mm. (Y direction in FIG. 7) The number 2D2 attached to the vernier scale 2D is a scale used when the crack to be measured shrinks, and the position of the arrow on the vernier scale 2D is 0 on the main scale 3D. If it is on the left, crack shrinkage can be measured in units of -0.05 mm. (Rotating direction in FIG. 7) With the scales 2E23 and 3E23, it is possible to measure the case where the behavior of the crack moves up and down (shear force). (Haar direction and Ni direction in FIG. 7) Regarding the right scale part 2 and the left scale part 3, the right scale part and the left scale part may be configured in the opposite manner to the case shown in the drawing. it can.

The operation will be described together with the effect.

[0015]

[Effect of device]

 Since the present invention is configured as described above, it has the following effects. In the wall surface 4 of the concrete structure having the crack 4A that requires measurement, the right base 2A and the left base 3A are fixed to the right wall 4B and the left wall 4C, respectively, centering on the crack 4A. As a result, it is possible to measure the delicate behavior of concrete by displaying the movement of the crack 4A on a scale. This makes it possible to measure the behavior of cracks, which makes it easier to investigate the cause of cracks, determine the repair method, and infer the existence of defects in the structure.

[Brief description of drawings]

FIG. 1 is a front view.

FIG. 2 is a side view.

FIG. 3 is a rear view.

FIG. 4 is an end view taken along the line AA.

FIG. 5 is an end view taken along line BB.

FIG. 6 is an enlarged front view of a scale portion.

FIG. 7 is a front view of a usage state.

[Explanation of symbols]

 1 Crack behavior stability measuring instrument 2 Right scale 2A Right base 2B Subscale 2C Dovetail groove 2D Subscale scale 2E Right leg 3 Left scale 3A Left base 3B Dovetail projection 3C Main scale 3D Main scale scale 3E Left leg

Claims (3)

[Scope of utility model registration request] 1. A right scale part (2) and a left scale part (3), wherein the right scale part (2) is a front square right base part (2).
A), a vernier scale (2B) protruding leftward on the lower half of the left side of the right base, and a dovetail groove (2C) carved in the left-right direction on the lower surface of the vernier scale, A vernier scale (2D) formed on the upper side of the surface of the vernier body (2B) and a right leg portion (2E) provided on the right base portion (2A) are provided on the right base portion (2A). On the other hand, the right leg (2E) is configured so that the support angle can be freely changed, and the left scale (3) has a front square left base (3A) and a right side of the lower half of the right side of the left base. Dovetail ridges (3B) projecting toward, and a main scale body (3C) projecting toward the right in the upper half of the right side of the left base (3A), and a main scale body (3C). ) A main scale graduation (3D) formed on the lower side of the surface and a left leg portion (3E) provided on the left base portion (3A), and the left leg portion with respect to the left base portion (3A). Division (3E) Freely configured change the support angle,
Then, the right scale part (2) and the left scale part (3) have a dovetail groove (2C) on the right scale part (2) side and a dovetail groove (3B) on the left scale part (3) side. It fits slidably and the vernier scale (2
A crack behavior stability measuring instrument characterized in that the vernier scale (2D) of B) and the main scale (3D) of the main scale body (3C) are arranged to face each other. 2. A disc-shaped body (2) in the right leg (2E).
Adhesive (2E3) is applied to the lower surface of E21), and
The crack behavior stability measuring instrument according to claim 1, wherein an adhesive (3E3) is applied to the lower surface of the disk-shaped body (3E21) in the left side scale (3). 3. The short column portion (2E) of the right leg portion (2E).
22), a scale (2E23) is formed on the outer periphery of the upper surface, and a scale (3E23) is formed on the outer periphery of the upper surface of the short column portion (3E22) of the left scale portion (3).
Alternatively, the crack behavior stability measuring device according to claim 2.