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Fixed-center circle drawing tool

A technology of setting the center of a circle and drawing a circle, which is applied to roads, road repairs, roads, etc., can solve the problems of cutting circles not concentric with the wellbore, damage and cracking, etc., and achieve the effects of small deviation, high accuracy and low cost

Active Publication Date: 2015-12-23
SHANDONG HUITONG CONSTR GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem of early failure and cracking caused by the inconcentricity of the cutting circle and the wellbore, the present invention provides a circle centering tool

Method used

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Embodiment 1

[0018] Such as figure 1 , figure 2 As shown, a tool for setting the center of a circle and drawing a circle includes a vertical rod 1, and also includes a conical platform 9 for determining the center of the wellbore and for carrying the vertical rod 1. The diameter of the top surface of the conical platform 9 is larger than the diameter of the wellbore 30-50mm, the diameter of the bottom surface of the conical platform 9 is 30-50mm smaller than the diameter of the shaft; the center of the conical platform 9 is provided with a vertical rod socket 10, which is the same The shaft is set; the bottom of the vertical rod 1 is detachably connected with the vertical rod bearing socket 10.

[0019] The vertical rod 1 is sleeved with a height adjustment ring 8 that can move up and down along the vertical rod 1. The height adjustment ring 8 is fixedly connected with the inner ring of the bearing 7; The shaft is hingedly connected with the connecting block 3; the telescopic rod 4 is p...

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Abstract

The invention discloses a fixed-center circle drawing tool and belongs to the field of municipal construction tools. The fixed-center circle drawing tool comprises a vertical rod. The vertical rod is sleeved with a height adjustment ring which can move up and down along the vertical rod. The height adjustment ring is fixedly connected with an inner ring of a bearing. A connecting block is fixedly arranged on the outer wall of an outer ring of the bearing. The connecting block is connected with a telescopic rod in a hinged mode. The telescopic rod is perpendicular to the vertical rod. The telescopic rod is sleeved with a line scribing pen which can move leftwards and rightwards along the telescopic rod. Firstly, a circular-truncated-cone-shaped carrier platform is placed at a hole of a cover plate, the circular-truncated-cone-shaped carrier platform is located at the hole of the cover plate and does not fall, and the outer wall of the circular-truncated-cone-shaped carrier platform is tightly attached to the wall of a well. The vertical rod is inserted in an insertion hole of the vertical rod, and the insertion hole of the vertical rod is coaxial with the circular-truncated-cone-shaped carrier platform. In this way, the center of the insertion hole of the vertical rod is the circle center of a shaft. The height of the pen point of the line scribing pen is adjusted by adjusting the height adjustment ring according to the construction condition. The length of the telescopic rod is adjusted according to the construction condition, and a circle is drawn by means of the line scribing pen. The construction range can be cut and reinforced by constructors according to a drawn range.

Description

technical field [0001] The invention relates to the field of municipal construction tools, in particular to a center-fixing and circle-drawing tool used in the reinforcement process of inspection wells. Background technique [0002] In the process of strengthening and installing municipal road inspection wells, in order to make the surrounding reinforcement range of the manhole cover consistent, the edges smooth, improve the edge force, and improve the durability of use, the design requires that the manhole cover reinforcement area must be cut to be a perfect circle concentric with the wellbore. [0003] In the actual construction process, workers draw circles by hand. Limited by the technical level of workers, the circle deviation after cutting is relatively large, and it is very easy to have the phenomenon that the two centers of the circles are not concentric. The reinforcement strength of the edge of the manhole cover is inconsistent, which is easy to cause early damage a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E01C23/01
Inventor 冯化新刘林坤付同华杨玲玲陈永慧
Owner SHANDONG HUITONG CONSTR GRP CO LTD
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