Embedded hardware stud dowel angle measuring instrument

Abstract

To provide an embedded hardware stud dowel angle measuring instrument capable of easily determining whether or not a bending angle of a stud dowel bent to avoid interference with a reinforcement when installing embedded metal is within an allowable angle.SOLUTION: An embedded hardware stud dowel angle measuring instrument 20 for measuring the bending angle of a stud dowel in which a stud dowel 10 is implanted in an embedded hardware plate 9 includes a measuring part 1 displaying an allowable bending angle of the stud dowel and foundation parts 5, 6 for holding the measuring part horizontally to the embedded hardware plate, the bending angle of the stud dowel can be measured by comparing the allowable bending angle displayed on the measuring part with the stud dowel to be measured through the measuring part.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] An embodiment of the present invention relates to an embedded hardware stud dowel angle measuring device that measures the angle of a stud dowel placed on an embedded hardware. [Background technology]

[0002] The pipes and cable trays installed in nuclear plants are attached via these support structures (support materials) to embedded metal fittings that were installed in the walls, ceilings, floors, etc. during the construction of the plant. The embedded metal fittings consist of rod-shaped metal components called stud dowels welded to metal plates, and when the nuclear plant is constructed, the stud dowels are inserted between the rebars of the framework and then hardened with concrete to secure them in place.

[0003] However, there are cases where the stud dowel interferes with the rebar, making it impossible to install the embedded hardware, so in such cases the stud dowel can be bent from the bottom to avoid interference between the stud dowel and the rebar in the frame. When the stud dowel is bent, the pull-out strength of the embedded hardware is affected, but as long as it is within the allowable angle, the pull-out strength is guaranteed.

[0004] Therefore, in order to install embedded metal fittings efficiently and with quality maintained during the construction of nuclear power plants, a simple method is needed to determine whether the bending angle of the stud dowel, which is bent to avoid interference between the stud dowel and the reinforcing bars of the structure, is within the allowable angle before installing the embedded metal fittings. However, at present, no method has been considered to realize this need.

[0005] As a method for controlling the quality of embedded metal fittings, there are examples where hammering tests and ultrasonic tests are used to check the soundness of embedded metal fittings after installation. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Publication No. 61-191743 [Patent Document 2] Japanese Patent Application Publication No. 3-147957 [Patent Document 3] Japanese Patent Application Publication No. 2019-39709 Summary of the Invention [Problem to be solved by the invention]

[0007] When constructing a nuclear power plant, the bending angle of stud dowels must be managed to install embedded metal fittings while maintaining quality. Furthermore, to efficiently measure the bending angle of a significant number of stud dowels, a measurement method is required that takes into account the weld beads that occur at the connection between the embedded metal plate and the stud dowel, the bending method of the stud dowel, and the shape of the embedded metal fittings. In particular, efficient bending angle measurement requires a measuring instrument specifically designed for measuring stud dowel bending angles.

[0008] Therefore, the object of the present invention is to provide an angle measuring device that can easily determine whether the angle of a stud dowel bent to avoid interference with rebar when installing embedded hardware is within the allowable angle range. [Means for solving the problem]

[0009] The embedded hardware stud dowel angle measuring instrument according to the above embodiment is an embedded hardware stud dowel angle measuring instrument that measures the bending angle of a stud dowel when the stud dowel is implanted into an embedded hardware plate, and is characterized in that it comprises a measuring unit that displays the allowable bending angle of the stud dowel, and a base unit for holding the measuring unit horizontally relative to the embedded hardware plate, and is capable of measuring the bending angle of the stud dowel through the measuring unit by comparing the allowable bending angle displayed on the measuring unit with the stud dowel to be measured. [Effects of the Invention]

[0010] The present invention has been made to solve the above-mentioned problems, and makes it easy to determine whether the bending angle of a stud dowel, which is bent to avoid interference with rebar when installing embedded hardware, is within the allowable angle range. [Brief explanation of the drawings]

[0011] [Figure 1] 1 is a projection view of an embedded metal fitting stud dowel angle measuring instrument according to Example 1. FIG. [Figure 2] 1 is a perspective view of an embedded metal fitting to be measured using an embedded metal fitting stud dowel angle measuring instrument according to Example 1. FIG. [Figure 3] 10 is a flowchart of a measurement and determination procedure using the first embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0012] Hereinafter, an embodiment of an embedded metal fitting stud dowel angle measuring instrument 20 according to the present invention will be described with reference to the drawings.

[0013] Example 1 FIG. 1 is a projection drawing (third angle projection) of the embedded hardware stud dowel angle measuring device 20 of the present invention, FIG. 2 is an oblique view of an embedded hardware measured by the embedded hardware stud dowel angle measuring device of Example 1, and FIG. 3 is a flowchart of the measurement and judgment procedure using the present invention. The following describes an example of the present invention with reference to the drawings.

[0014] In FIG. 2, the embedded metal fitting 9 to be installed in the structure is configured by embedding a stud dowel 10 into an embedded metal fitting plate 12 by welding (weld bead 11).

[0015] The measuring unit 1 that constitutes the embedded hardware stud dowel angle measuring instrument 20 is formed into a transparent rectangular plate-like body such as a quarter circle, and a straight line 2 or a figure such as ● or ■ that represents the allowable bending angle of the stud dowel is displayed with the corner of the plate-like body of the measuring unit 1 as the starting point 3 of the allowable bending angle display.The two-dimensional image information taken for record management when measuring the stud dowel bending angle is provided with a measurement object management information recording unit 4 that can display not only the bending angle of the stud dowel, which is the angle between the axial center of the stud dowel 10 and the embedded hardware plate 12 in the straight line section formed from the tip of the stud dowel 10 in the direction of starting point 3 with the embedded hardware plate 12, but also information such as the stud dowel management number of the object being measured and the measurement date.

[0016] Furthermore, the horizontal dimension of the measuring unit 1 is smaller than the minimum distance between the stud dowels 10 arranged on the same embedded hardware plate 12 of the embedded hardware 9 used in embedded hardware installation work, and the starting point of the allowable bending angle display can be set to the axial center of the bottom of the stud dowel regardless of the direction in which each stud dowel 10 is bent.

[0017] The base for holding the measuring unit 1 perpendicular to the embedded metal plate 12 is composed of transparent base A 5 and base B 6, which are arranged to sandwich the measuring unit 1. Furthermore, base A 5 and base B 6 are provided with lateral support parts 13 to prevent the measuring unit 1 from falling over.

[0018] Furthermore, slide adjustment unit 7 is located by hollowing out foundation A section 5, foundation B section 6, and measurement section 1, allowing the position of measurement section 1 to be moved horizontally. The starting point for the allowable bending angle display is set to the center of the axis of the stud dowel 10 being measured, making it possible to measure the allowable bending angle even for stud dowels 10 with different diameters.

[0019] Finally, the measurement unit 1, which can move horizontally, can be fixed by the slide adjustment and fixing unit 8. The slide adjustment and fixing unit 8 can be easily fixed and released using bolts and nuts. Then, the measurement unit 1 can be removed from the sandwiched foundation A part 5 and foundation B part 6, making it easy to calibrate the allowable bending display displayed on the measurement unit 1 and to maintain the foundation A part 5 and foundation B part 6.

[0020] In the embodiment of the present invention configured as above, a measurement and determination procedure for determining whether the bending angle of the stud dowel 10 of the embedded metal fitting 9 is within the allowable value will be described below with reference to FIG.

[0021] First, the embedded metal fitting 9 is installed with the stud dowel 10 to be measured facing the ceiling (S1).

[0022] An embedded metal fitting stud dowel angle measuring instrument 20 is placed on the embedded metal fitting plate 12 of the embedded metal fitting 9 to be measured (S2).

[0023] The stud dowel 10 to be measured and the measuring part 1 of the embedded metal fitting stud dowel angle measuring instrument 20 are brought close together, and the foundation A part 5 or the foundation B part 6 is placed at the end of the weld bead 11 generated at the welded part between the embedded metal fitting 9 and the stud dowel 10 (S3).

[0024] After installing the embedded metal fitting stud dowel angle measuring device 20, the measuring unit 1 is moved using the slide adjustment unit 7, and the starting point 3 of the allowable bending angle display is set to the axial center of the bottom of the stud dowel (S4).

[0025] The measuring unit 1 is fixed to the base A unit 5 and the base B unit 6 using the slide adjusting and fixing unit 8 (S5).

[0026] The bent stud dowel 10 is visually compared with the allowable bend angle display 2 through the transparent measuring section 1 to determine whether the bend angle of the stud dowel 10 is within the allowable angle range (S6).

[0027] When the judged stud dowel 10 and measurement section 1 are recorded and managed as two-dimensional information, the stud dowel management information of the measurement object is displayed in the measurement object management information description section 4 (S7).

[0028] The allowable bending angle display 2, the stud dowel 10, and the measurement object management information description section 4 can be output as one two-dimensional information (S8). [Explanation of symbols]

[0029] 1: Measurement section, 2: Straight line showing allowable bending angle, 3: Starting point of allowable bending angle display, 4: Measurement object management information section, 5: Foundation A section, 6: Foundation B section, 7: Slide adjustment section, 8: Slide adjustment fixing section, 9: Embedded hardware, 10: Stud dowel, 11: Weld bead, 12: Embedded hardware plate, 13: Lateral support section, 20: Embedded hardware stud dowel angle measuring device.

Claims

1. An embedded hardware stud dowel angle measuring instrument for measuring the bending angle of a stud dowel in which a stud dowel is implanted in an embedded hardware plate, The stud dowel has a measuring section on which the allowable bending angle of the stud dowel is displayed, and a base section for holding the measuring section horizontally relative to the embedded metal plate. An embedded hardware stud dowel angle measuring device characterized in that the bending angle of the stud dowel can be measured by comparing the allowable bending angle displayed on the measuring unit with the stud dowel to be measured through the measuring unit.

2. 2. The embedded metal fitting stud dowel angle measuring instrument according to claim 1, wherein the measuring unit is made up of a transparent plate and displays the allowable bending angle of the stud dowel.

3. 3. The embedded metal fitting stud dowel angle measuring instrument according to claim 1, wherein the measuring section is provided with a measurement object management information recording section capable of displaying stud dowel management information of the measurement object.

4. The embedded hardware stud dowel angle measuring instrument described in claim 1, characterized in that the measuring unit is provided with a slide adjustment unit that can move horizontally relative to the embedded hardware plate, and the starting point of the allowable bending angle display can be set to the axial center of the stud dowel to be measured.

5. An embedded hardware stud dowel angle measuring device as described in claim 1, characterized in that the horizontal dimension of the measuring part is smaller than the smallest dimension of the spacing between stud dowels arranged on the same embedded hardware plate of the embedded hardware used in embedded hardware setting work, and the starting point of the allowable bending angle display can be set to the axial center of the bottom of the stud dowel regardless of the direction in which each stud dowel is bent.

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