JP2518859Y2 - Manhole connection pipe angle calculator - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a simple calculator for easily finding the angle of a connecting pipe of a manhole.

[0002]

2. Description of the Related Art When designing a sewer pipeline, a manhole must be provided at the confluence or the bend of the pipeline. The manhole may have steps for raising and lowering during inspection, or multiple inflow pipes may be connected. Therefore, the pipe connected to the manhole needs to be arranged so that the elevating step and the plurality of inflow pipes do not interfere with each other.

[0003]

Therefore, the designer of the sewer pipe must make a complicated calculation to determine the position and angle of the connecting pipe, or draw and confirm the actual drawing at a reduced scale. The present invention eliminates such annoyance, and when there is a central angle of the connecting pipe with respect to the manhole raising / lowering step and a plurality of inflow pipes, a simple calculator that can easily determine the central angle of the positions where they do not interfere with each other Is provided.

[0004]

DISCLOSURE OF THE INVENTION The present invention is a circular scale plate provided with an angle scale and a circular plate having a diameter smaller than that of the scale plate which is concentrically and rotatably attached to the scale plate. Manhole connection pipe characterized in that the diameter of the mounting pipe is entered as a chord and a manhole scale schematic plane drawing plate with steps for raising and lowering and a rotatable radius cursor with a scale reading line of the scale plate are provided. It is an angle calculator. The radius cursor is a radius arm consisting of a rotatable, transparent thin plate with a reading line for reading the angle scale.

[0005]

Operation: The calculator of the present invention acts like a circular slide rule. It consists of a disk with an angle scale on the circumference, a radius cursor that shares the center of this disk, and a concentric disk that describes the data of the manhole. Is read by.

[0006]

[Example] A piping design drawing for a sewerage road is drawn with a single line for the piping route regardless of the thickness of the pipeline, and the manhole only draws a circle on the line. Further, the hole for connecting the pipe to the manhole is made slightly larger than the outer diameter of the connecting pipe. In the precast manhole, there are many cases where this connection hole is drilled at the factory.

FIG. 1 shows an embodiment of the calculator of the present invention. FIG. 1 (a) is a plan view and FIG. 1 (b) is a side view.
This calculator is composed of a scale plate 1, a manhole model plane figure disk 2, and a radius cursor 3. The circular scale plate 1 has a 360 ° scale on the outer circumference. The diameter of the manhole model disk 2 represents the inner diameter of the manhole on a scale. On the surface, the steps for raising and lowering and the diameter of the drilled holes (plurality) are displayed in a reduced scale. The steps for raising and lowering are drawn in this portion with the outer circumference of the disc 2 as the inner circumference of the manhole. Further, the excavation diameter is drawn as a chord of the disc 2, and the chord indicating the drilling diameter shows the size of the excavation diameter and the center thereof. The radius cursor 3 is a pointer, and a colored memory reading line is engraved in the center of the transparent plate, and this line extends up to the angle scale of the scale plate 1.

The center pin 4 includes a scale plate 1 and a schematic disc 2.
Both the center and the one end of the radius cursor 3 are rotatably bound. The usage of the example is as follows. For example, a case where a hole of 760 mmφ is drilled while avoiding the position of the elevating step will be described. (1) First, the center of the elevating step 5 of the schematic disc 2 is aligned with the 0 ° position of the scale plate 1. (Figure 1). (2) Next, the radius cursor 3 is turned to align the memory read line 6 with the left base of the ascending / descending step 5. (Figure 2). (3) Next, with the radius cursor 3 and the scale plate 1 fixed, only the schematic disc 2 is rotated to align the right end of the chord 7 having a hole diameter of 760 mmφ with the engraved line of the cursor line 6. (Figure 3). (4) Next, the scale plate 1 and the schematic disc 2 are fixed, the radius cursor 3 is turned, and the memory reading line 6 is set to the chord 7 of 760 mmφ.
Align it with the center 8 and read the angular scale on the extension (Fig. 4). (5) If the drilling center is set at a position at an angle larger than the angle scale at that time, drilling can be performed at a position unrelated to the lifting step 5.

[0009]

EFFECTS OF THE INVENTION According to the connection pipe angle calculator for a manhole of the present invention, since the center of perforation of the connection pipe hole can be found by a simple operation, the manhole piping design and perforation work are facilitated.

[Brief description of drawings]

FIG. 1A is a plan view and FIG. 1B is a side view of an embodiment of the present invention.

FIG. 2 is an explanatory view of a method of using the present invention.

FIG. 3 is an explanatory view of a method of using the present invention.

FIG. 4 is an explanatory view of a method of using the present invention.

[Explanation of symbols]

1 Scale disk 2 Manhole model disk 3 Radius cursor 4 Center pin 5 Elevating step 6 Memory reading line

Claims (1)

(57) [Scope of utility model registration request] 1. A circular scale plate having an angle scale on its circumference, and a circular plate which is concentrically and rotatably mounted on the scale plate and has a diameter smaller than that of the scale plate. A manhole connecting pipe angle calculator, comprising: a manhole reduced-scale schematic planographic plate on which a step for lifting and lowering is drawn and a rotatable radius cursor with a scale reading line on the scale plate.