Concrete pouring thickness measuring device

Abstract

This invention provides a concrete pouring thickness measuring device that measures the thickness of uncured concrete poured into a formwork as the concrete pouring thickness, while employing a simple and inexpensive configuration to enable easy measurement of concrete pouring thickness. [Solution] The system includes a main body 10 installed on the upper surface 61 of the unhardened concrete 60, a measuring shaft member 30 that is held by the main body 10 in a state in which the amount of downward protrusion from the lower end of the main body 10 can be changed by sliding along the axial direction, and a concrete pouring thickness output unit 40 that measures the amount of protrusion of the measuring shaft member 30 from the lower end of the main body 10 and outputs the amount of protrusion as the concrete pouring thickness when the main body 10 is installed on the upper surface 61 of the unhardened concrete 60 and the measuring shaft member 30 is protruded downward from the lower end of the main body 10 until the tip 31 of the measuring shaft member 30 contacts the bottom surface 51 inside the formwork 50.

Description

Technical Field

[0001] The present invention relates to a concrete placement thickness measuring device that measures the thickness of freshly placed concrete placed in a formwork as the concrete placement thickness.

Background Art

[0002] As a concrete placement thickness measuring device that measures the thickness of freshly placed concrete placed in a formwork as the concrete placement thickness, the one described in Patent Document 1 is known. The concrete placement thickness measuring device described in Patent Document 1 inserts a measuring rod upward from a hole drilled in the bottom of the formwork into the freshly placed concrete in the formwork, and when the tip protrudes upward from the upper surface of the freshly placed concrete and the energization between the tip and the freshly placed concrete is interrupted, the insertion length of the measuring rod is measured as the concrete placement thickness.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the concrete placement thickness measuring device described in Patent Document 1 above, since the measuring rod is made of a conductive material and the outer surface of the measuring rod other than the tip needs to be coated with an insulating material such as synthetic resin, the measuring rod becomes complicated and expensive. Furthermore, since operations such as connecting wires for energizing between the tip of the measuring rod and the freshly placed concrete to the inner surface of the formwork and drilling holes for inserting the measuring rod into the bottom of the formwork are required, complication of the measuring operation becomes a problem. In light of this situation, the main objective of the present invention is to provide a concrete pouring thickness measuring device that measures the thickness of unhardened concrete poured into a formwork as the concrete pouring thickness, while employing a simple and inexpensive configuration and enabling easy measurement of the concrete pouring thickness. [Means for solving the problem]

[0005] The first characteristic configuration of the present invention is a concrete pouring thickness measuring device that measures the thickness of unhardened concrete poured into a formwork as the concrete pouring thickness, The main body is installed on the upper surface of the unhardened concrete, A measuring shaft member is held in the main body in a state in which the amount of downward protrusion from the lower end of the main body can be freely changed by sliding along the axial direction, The device includes a concrete pouring thickness output unit that measures the amount of protrusion of the measuring shaft member from the lower end of the main body, and outputs this amount as the concrete pouring thickness, while the main body is placed on the upper surface of the uncured concrete and the tip of the measuring shaft member, which protrudes downward from the lower end of the main body, is in contact with the bottom surface inside the formwork.

[0006] With this configuration, by simply placing the main unit on the top surface of the uncured concrete and bringing the tip of the measuring shaft member protruding from the bottom end of the main unit into contact with the bottom surface inside the formwork, the amount of protrusion of the measuring shaft member from the bottom end of the main unit can be output as the concrete pouring thickness by the concrete pouring thickness output unit. Therefore, the measuring shaft member only needs to be one that can be inserted downwards from the top side into the uncured concrete, resulting in a simple and inexpensive configuration. Furthermore, processing of the formwork and wiring are unnecessary. Therefore, the present invention provides a concrete pouring thickness measuring device that measures the thickness of unhardened concrete poured into a formwork as the concrete pouring thickness, and offers a technology that allows for easy measurement of concrete pouring thickness while employing a simple and inexpensive configuration.

[0007] A second characteristic feature of the present invention is that a support flange is fixed to the lower end of the main body, which contacts the upper surface of the unhardened concrete in the measurement state.

[0008] With this configuration, the measuring shaft member protruding from the lower end of the main body is inserted into the unhardened concrete from the top side, and with its tip in contact with the bottom surface inside the formwork, the amount of protrusion of the measuring shaft member from the lower end of the main body is adjusted so that the support flange provided at the lower end of the main body contacts the top surface of the unhardened concrete, thereby the amount of protrusion can be measured as the concrete pouring thickness.

[0009] A third characteristic configuration of the present invention is that the main body has a measuring shaft member fixing device capable of fixing the measuring shaft member to the main body, The key feature is that the section modulus of the contact surface of the support flange with respect to the upper surface of the unhardened concrete is set such that the tilting of the main body is prevented when the measuring shaft member, whose tip is in contact with the bottom surface inside the formwork in the measurement state, is fixed to the main body by the measuring shaft member fixing device.

[0010] With this configuration, the measuring shaft member, whose tip is in contact with the bottom surface inside the formwork, is fixed to the main body by a measuring shaft member fixing device, thereby allowing the weight of the main body to be supported by the bottom surface inside the formwork. In this measurement state, the support flange fixed to the lower end of the main body is brought into contact with the upper surface of the uncured concrete, preventing the main body from tilting. As a result, the worker can independently take photographic evidence of the measurement results, such as the concrete pouring thickness displayed on a display unit provided on the main body as a concrete pouring thickness output unit, while the main body is standing upright on the upper surface of the uncured concrete. [Brief explanation of the drawing]

[0011] [Figure 1] Elevation drawing showing the configuration and state of the concrete pouring thickness measuring device of this embodiment during the installation process. [Figure 2] Elevation view showing the configuration of the concrete pouring thickness measuring device of this embodiment and the state during the measurement process. [Figure 3] Plan view of the concrete pouring thickness measuring device of this embodiment [Modes for carrying out the invention]

[0012] Embodiments of the present invention will be described with reference to Figures 1, 2, and 3. The concrete pouring thickness measuring device (hereinafter referred to as "this device") 1 of this embodiment is a device for easily measuring the thickness of unhardened concrete 60 poured into formwork 50 as the concrete pouring thickness t, while employing a simple and inexpensive configuration when constructing RC slabs, beams, etc.

[0013] The device 1 comprises a main body 10 installed on the upper surface 61 of unhardened concrete 60, a measuring shaft member 30 that slides along the axial direction and is held by the main body 10 in a state in which the amount of downward protrusion from the lower end of the main body 10 can be changed, and a laser distance meter 40 (an example of a concrete pouring thickness output unit) that measures the amount of protrusion of the measuring shaft member 30 from the lower end of the main body 10 and outputs the amount of protrusion as the concrete pouring thickness t.

[0014] As will be described in detail later, the concrete pouring thickness measurement method using this device 1 involves, in order, an installation step of placing the main body 10 of the concrete pouring thickness measuring device 1 on the upper surface 61 of the unhardened concrete 60, as shown in Figure 1, and a measurement step of placing the main body 10 on the upper surface 61 of the unhardened concrete 60, and bringing the tip 31 of the measuring shaft member 30, which protrudes downward from the lower end of the main body 10, into contact with the bottom surface 51 inside the formwork 50, as shown in Figure 2.

[0015] In other words, the worker places the main body 10 on the upper surface 61 of the unhardened concrete 60 in the installation process (see Figure 1), and then, in the measurement process (see Figure 2), performs the work of bringing the tip 31 of the measuring shaft member 30, which protrudes downward from the lower end of the main body 10, into contact with the bottom surface 51 inside the formwork 50 to achieve the measurement state. Specifically, as shown in Figure 1, the main body 10 is placed on the upper surface 61 of the unhardened concrete 60 without the measuring shaft member 30 protruding from the lower end of the main body 10. Then, as shown in Figure 2, for example, the handle portion 36 connected to the measuring shaft member 30 is moved downward so that the measuring shaft member 30 protrudes from the lower end of the main body 10 until its tip contacts the bottom surface 51 of the formwork 50, thereby achieving the measurement state. By performing this operation, the amount of protrusion of the measuring shaft member 30 from the lower end of the main body 10 is measured and output by the laser distance meter 40 as the concrete pouring thickness t. Therefore, the measuring shaft member 30 only needs to be something that can be inserted downward from the upper surface 61 side into the unhardened concrete 60, resulting in a simple and inexpensive configuration. Furthermore, processing and wiring of the formwork 50 are unnecessary.

[0016] In this embodiment, although the main body 10 was installed on the upper surface 61 of the unhardened concrete 60 without the measuring shaft member 30 protruding from the lower end of the main body 10 during the installation process (see Figure 1), the main body 10 may also be installed on the upper surface 61 of the unhardened concrete 60 with the measuring shaft member 30 already protruding from the lower end of the main body 10. That is, before installing the main body 10 on the upper surface 61 of the unhardened concrete 60, the measuring shaft member 30 is made to protrude a longer distance from the lower end of the main body 10. Then, the measuring shaft member 30 is inserted into the unhardened concrete 50 from the top side, its tip is brought into contact with the bottom surface 51 of the formwork 50, and the main body 10 is moved downwards. By doing so, the measuring shaft member 30 is pushed into the main body 10 by the reaction force from the bottom surface 51 of the formwork 50, and the main body 10 is installed on the upper surface 61 of the unhardened concrete 60, thereby achieving the above measurement state.

[0017] The laser distance meter 40 measures the protruding amount of the measurement axis member 30 from the lower end of the main body 10 as the concrete placement thickness t, and outputs the measurement result including the concrete placement thickness t in a form that is displayed on a display unit 41 such as a display. Therefore, the operator can take a photo of the entire apparatus 1 installed on the upper surface 61 of the uncured concrete 60 so that the measurement result including the concrete placement thickness t displayed on the display unit 41 of the laser distance meter 40 appears, and use the photo as evidence of the completion of the work. Hereinafter, the detailed configuration of the apparatus 1 will be described.

[0018] The main body 10 is configured as a cylindrical member that extends along the axial direction (the vertical direction in FIGS. 1 and 2) and at least the lower end is open. Further, a gripping portion 12 for the operator to grip is fixed to the side of the main body 10. Furthermore, at the lower end of the main body 10, a support flange 20 that abuts against the upper surface 61 of the uncured concrete 60 in the measurement state shown in FIG. 2 is fixed by a plurality of fixing screws 22. Then, the main body 10 is installed on the upper surface 61 of the uncured concrete 60 with the support flange 20 positioned at the lower end and in a posture where the axial direction is along the vertical direction.

[0019] The measurement axis member 30 is configured as a rod-shaped member that extends along the axial direction, and is housed inside the cylindrical main body 10 in a slidable state along the axial direction. A handle portion 36 is attached to the measurement axis member 30 via a bolt shaft portion 37, and a long hole 14 that is long along the axial direction for the bolt shaft portion 37 to move along the axial direction of the main body 10 is formed in the main body 10. Therefore, the operator can hold the handle portion 36 attached to the measurement axis member 30 and move it along the axial direction while gripping the gripping portion 12 fixed to the main body 10, so as to move the measurement axis member 30 along the axial direction with respect to the main body 10 in a state where the position of the main body 10 is fixed, and change the protruding amount of the measurement axis member 30 from the open portion at the lower end of the main body 10.

[0020] Furthermore, the handle portion 36 and the bolt shaft portion 37 function as a measuring shaft member fixing device 35 that can fix the measuring shaft member 30 to the main body 10. That is, by rotating the handle portion 36, into which a nut (not shown) screwed onto the bolt shaft portion 37 is embedded, in one direction, the measuring shaft member 30 is fixed to the main body 10, preventing movement of the measuring shaft member 30 along its axial direction. By rotating the handle portion 36 in the opposite direction, the fixing of the measuring shaft member 30 to the main body 10 is released, allowing movement of the measuring shaft member 30 along its axial direction.

[0021] A laser distance meter 40 is fixed to the upper end of the main body 10, and a light-emitting unit 42 that emits laser light and a light-receiving unit 43 that receives laser light are provided at its lower end. A reflector 33 that reflects laser light is fixed to the upper end of a measuring shaft member 30 housed inside the main body 10. The laser distance meter 40 is configured to irradiate laser light from the light-emitting unit 42 toward the reflector 33 provided on the upper end of the measuring shaft member 30, receive the laser light reflected by the reflector 33 with the light-receiving unit 43, measure the distance between the upper end (reflector 33) of the measuring shaft member 30 and the main body 10, and determine the amount of protrusion of the measuring shaft member 30 from the lower end of the main body 10 from the measurement result. Furthermore, the upper end of the laser distance meter 40 is provided with a height correction unit 45 for adjusting the installation height of the laser distance meter 40 relative to the main unit 10 in order to calibrate the error in the measurement results.

[0022] A support flange 20 is fixed to the lower end of the main body 10 by multiple fixing screws 22, which contacts the upper surface 61 of the unhardened concrete 60 in the measurement state shown in Figure 2. That is, by inserting the measuring shaft member 30 protruding from the lower end of the main body 10 into the unhardened concrete 60 from the upper surface 61 side, and with its tip 31 in contact with the bottom surface 51 inside the formwork 50, the amount of protrusion of the measuring shaft member 30 from the lower end of the main body 10 is adjusted so that the support flange 20 provided at the lower end of the main body 10 contacts the upper surface 61 of the unhardened concrete 60, and the amount of protrusion can be measured as the concrete pouring thickness t.

[0023] Furthermore, the section modulus of the contact surface of the support flange 20 with respect to the upper surface 61 of the unhardened concrete 60 is set such that, in the measurement state shown in Figure 2, the tip 31 of the measuring shaft member 30, which is in contact with the bottom surface 51 inside the formwork 50, is fixed to the main body 10 by the measuring shaft member fixing device 35, and the tilting of the main body 10 is prevented. For example, when the main body 10 is tilted at a predetermined angle (e.g., 1°), the stress σ (N / mm²) acting on the upper surface 61 of the unhardened concrete 60 from the support flange 20 is... 2 ) is the yield stress σc (for example, 400 Pa = 0.0004 N / mm²) of unhardened concrete 60 immediately after placement. 2 If the section modulus of the contact surface of the support flange 20 is set to be smaller than ), the section modulus will be such that it can prevent the main body 10 from tilting. Furthermore, the stress σ (N / mm²) acting from the support flange 20 to the upper surface 61 of the unhardened concrete 60 2 ) is the section modulus of the contact surface of the support flange 20, Z(mm 3 Assuming that the main body 10 is tilted at a predetermined angle (for example, 1°), the moment acting from the support flange 20 to the upper surface 61 of the unhardened concrete 60 can be calculated using the following formula (1). σ = M / Z ... (1)

[0024] Specifically, referring to Figure 3, the support flange 20 is formed in the shape of a circular plate in plan view, and its diameter is set to be relatively large enough to allow the main body 10 to stand on its own on the upper surface 61 of the unhardened concrete 60. Furthermore, by fixing the measuring shaft member 30, whose tip 31 is in contact with the bottom surface 51 inside the formwork 50 when measuring, to the main body 10 with the measuring shaft member fixing device 35, the weight of the main body 10, etc., is supported by the bottom surface 51 inside the formwork 50. Then, with the support flange 20 fixed to the lower end of the main body 10 in contact with the upper surface 61 of the unhardened concrete 60, the tilting of the main body 10 is prevented. As a result, the worker who installed the device 1 can release their hand from the gripping part 12 of the main body 10 and, with the main body 10 standing upright on the upper surface 61 of the unhardened concrete 60, take photographic evidence of measurement results such as the concrete pouring thickness t displayed on the display unit 41 of the laser distance meter 40.

[0025] In this embodiment, the section modulus of the contact surface of the support flange 20 with respect to the upper surface 61 of the unhardened concrete 60 is set to be sufficient to prevent the main body 10 from tilting. However, if the operator is constantly holding the gripping portion 12 of the main body 10 during measurement and there is no need to make the main body 10 self-supporting, the diameter of the support flange 20 may be reduced or the support flange 20 may be omitted. [Explanation of symbols]

[0026] 1. Concrete pouring thickness measuring device 10 Main unit 20 Support flange 30 Measuring shaft member 31 Tip 35 Measuring shaft member fixture 40. Laser distance meter (concrete pouring thickness output unit) 50 formwork 51 Bottom 60 Unhardened concrete 61 Top surface t Concrete pouring thickness

Claims

1. A concrete pouring thickness measuring device that measures the thickness of unhardened concrete poured into formwork as the concrete pouring thickness, The main body is installed on the upper surface of the unhardened concrete, A measuring shaft member is held in the main body in a state in which the amount of downward protrusion from the lower end of the main body can be freely changed by sliding along the axial direction, A concrete pouring thickness measuring device comprising: a concrete pouring thickness output unit that measures the amount of protrusion of the measuring shaft member from the lower end of the main body and outputs the amount of protrusion as the concrete pouring thickness, while the main body is placed on the upper surface of uncured concrete and the tip of the measuring shaft member, which protrudes downward from the lower end of the main body, is in contact with the bottom surface inside the formwork.

2. The concrete pouring thickness measuring device according to claim 1, wherein a support flange is fixed to the lower end of the main body, which contacts the upper surface of the unhardened concrete in the measurement state.

3. The main body has a measuring shaft member fixing device that can fix the measuring shaft member to the main body, The concrete pouring thickness measuring device according to claim 2, wherein the section modulus of the contact surface of the support flange with respect to the upper surface of the unhardened concrete is set such that the tilting of the main body is prevented when the measuring shaft member, whose tip is in contact with the bottom surface inside the formwork in the measurement state, is fixed to the main body by the measuring shaft member fixing device.

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