JPS62134531A - Method for measuring load applied to handrail at use time - Google Patents

Abstract

PURPOSE:To enhance the safety of a handrail by measuring load applied to the handrail at the time of use and calculating support mount strength corresponding to actual use, by detecting the bending, distortion, tensile and compression stress generated in the mount support by each sensor mounted to the mount support. CONSTITUTION:A sensor 1 for detecting bending stress generated in an up-and- down direction, a sensor 2 for detecting bending stress generated in a left-and- right direction, a sensor 3 for detecting torsion stress around an axis and a sensor 4 for detecting tensile stress and compression stress generated in the direction along the axial direction are provided to the peripheral surface of a mount support 5. Various stresses detected by the sensors 1-4 are measured by a dynamic stress gauge 7 and the measured values are recorded, for example, on a data recorder 8 or a pen recorder 9. In actual measurement, a measuring person grasps a handrail and takes various postures to perform measurement and, further, measurement is performed while variously changing the height of the handrail 6.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a method for measuring the load applied to a handrail when the handrail is used.

(Prior art) Handrails used in houses to assist when walking on stairs, for example, do not always carry a constant load in a fixed direction (they can be loaded with a wide variety of loads depending on the usage situation). Therefore, when fixing a handrail to a wall, it is necessary to take this load into consideration.Therefore, in the past, the force exerted by a person when pulling or pushing was directly measured using a measuring device. The installation strength of the handrail was determined based on the measurement results.

(Problem to be solved by the invention) However, since such a measurement method is performed by determining the direction of the load applied to the handrail in advance, it is impossible to measure loads applied from directions other than that direction. Therefore, there were limits to how much safety could be improved.

(Means for Solving the Problems) The method for measuring the working load of a handrail according to the present invention is to apply bending stress, torsional stress, and tensile stress that are generated on a mounting post that attaches a handrail to a wall surface due to the load applied to the handrail. , and a strain gauge for detecting compressive stress, respectively, and the working load of the handrail is measured by detecting the respective stresses generated in the mounting column using these sensors.

(Function) By detecting the bending stress, torsional stress, tensile stress, and compressive stress generated on the mounting support with each sensor attached to the installation support, the load applied when the handrail is used is measured, and this is used to determine the actual use. The installation strength of the support pillars is required to increase the safety of the handrail.

(Example) Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

Fig. 1 is a plan view showing one of the mounting posts provided at both ends of the handrail, Fig. 2 is a side view of the same, and Fig. 3 is a plan view of one of the mounting posts provided at both ends of the handrail.
Figure 4 shows the IV shown in Figure 1.
-IV line sectional view, and FIG. 5 is a VV line sectional view not shown in FIG. 2.

As shown in FIGS. 1 and 2, on the circumferential surface of the mounting column 5, there is a first sensor 1 that detects the bending stress that occurs in the vertical direction on the mounting column 5, and a first sensor 1 that detects the bending stress that occurs in the horizontal direction on the mounting column 5. a second sensor 2 that detects the torsional stress generated in the mounting column 5 around its axis;
A fourth sensor 4 is attached to the mounting column 5 to detect tensile stress and compressive stress generated in the direction along the axis of the mounting column 5.

As shown in FIG. 3, the first sensor 1 consists of two strain gauges 11 and 12, and these strain gauges 11 and 12 are placed between the upper and lower surfaces of the mounting column 5 with the axis of the mounting column 5 interposed therebetween. They are arranged symmetrically. Figure 6 shows
The circuit configuration of the first sensor 1 as described above is shown, and in the figure, the symbol R indicates a fixed resistor. The output voltage e of this sensor 1 is expressed by the following equation.

e+ = E+ /2 ・K, ・ε.

Here, El is the bridge voltage, K is the gauge factor, and ε1 is the value of bending strain obtained from either one of the strain gauges 11 or 12.

The second sensor 2, as shown in FIG. They are arranged symmetrically with each other. The circuit configuration of this sensor 2 and the output voltage e2 obtained are the same as those of the first sensor 1 described above.

As shown in FIG. 4, the third sensor 3 consists of four strain gauges 31, 32, 33. Arranged at 90 degree intervals, each attached to a mounting post 5
The mounting column 5 is tilted at 45 degrees with respect to the axis of the mounting column 5.
31, 34, 32, and 33 are opposite to each other with the axis of symmetry being the axis of symmetry.

FIG. 7 shows the circuit configuration of the third sensor 3 thus constructed. The output voltage e3 of this sensor 3 is expressed by the following 2.

e* = 3' εs ・E:1 Here, Kff
is the gauge factor, and E3 is the strain gauge 1 facing each other on the circuit.
The torsional strain value obtained from 1 and 13 or 12 and 13, E3 is the bridge voltage.

As shown in FIGS. 2 and 5, the fourth sensor 4 consists of four strain gauges 41, 42, 43, and 44, among which strain gauges 41, 43, 42, and 44
The strain gauges 41 of one set and the strain gauges 42 of the other set are aligned along the axis of the mounting post 5, and each set is arranged symmetrically across the axis of the mounting post 5. It was established. FIG. 8 shows the circuit configuration of the fourth sensor 4 thus constructed. The output voltage e4 of this sensor 4 is expressed by the following equation.

ea = (1+1/) E4 /2- to 4 - εs
Here, ν is Poisson's ratio, 应 is the bridge voltage, K4 is the gauge factor, and ε4 is any one pair of strain gauges 41 and 42 or 43 facing each other across the axis of the mounting post 5.
These are the tensile and compressive strain values obtained from and 44.

Each of the above sensors 1. 2. 3. 4 is also attached to the other mounting support (not shown) in the same manner as above.

In addition, each sensor 1.2. 3 (The mounting position of 4, that is, the distance from the base end 51 of the mounting post 5, depends on the length, thickness, cross-sectional shape, material of the mounting post 5, and the length of the handrail 6 attached to this mounting post 5. It may be determined as appropriate.

The various stresses detected by each sensor 1.2, 3.4 are measured by a dynamic strain meter 7 connected to these sensors 1, 2, 3.4,
Measured values are recorded using, for example, a data recorder 8 or a pen recorder 9 (see FIG. 9).

During the actual measurement, the measurer holds onto the handrail 6 and takes various postures, such as walking [see Figure 10 (al)].
, walking on one leg [see figure (bl)], leaning back with both legs [see figure (C)], horizontal pushing [see figure (d)], horizontal pulling [see figure (e1)], handrail support Pulling in the same direction [same figure (see fl)], jump installation [same figure (g
This is done by taking [see 1]. Moreover, this is done by changing the height of the handrail 6 in various ways and taking each of the above postures.

(Effects of the Invention) According to the method for measuring the working load of a handrail of the present invention, it is possible to measure loads applied to the handrail in all directions.

Therefore, since the attachment strength of the handrail can be determined accurately, the safety of the handrail can be improved.

[Brief explanation of drawings]

The figures show an example of the method for measuring the working load of a handrail according to the present invention, and FIG. 1 is a plan view showing a mounting support at one end of the handrail, and
3 is a sectional view taken along the line III-III shown in FIG. 1, FIG. 4 is a sectional view taken along the line ■-IV shown in FIG.
The figure is a cross-sectional view taken along the line V-V shown in Figure 2, Figure 6 is a circuit diagram of the first and second sensors that detect bending stress, and Figure 7 is a circuit diagram of the third sensor that detects torsional stress. Figure 8 is a circuit diagram of the fourth sensor that detects tensile stress and compressive stress, Figure 9 is a schematic diagram showing the connection state of the measuring equipment, and Figures 10 (a) to (g) are during measurement. It is an explanatory view explaining the posture of a measurer. 1... First sensor 2... Second sensor 3.
...Third sensor 4...Fourth sensor 11.
12, 21, 22, 31, 32, 33, 34, 41, 4
2,43.44...Strain Gauge No. 7 Z Hanging Figure 2 111-Er---Belt--Et, --m=Figure 70

Claims (1)

[Claims] 1) Attach a sensor consisting of a strain gauge to the mounting post that attaches the handrail to the wall to detect the bending stress, torsional stress, tensile stress, and compressive stress generated on the mounting post due to the load applied to the handrail, and A method for measuring the working load of a handrail, characterized in that the working load of the handrail is measured by detecting each of the stresses generated on the mounting support with a sensor.