摘要 |
PURPOSE: A benchmark for a survey is provided to confirm an accurate reference point by grasping a location of a pin member even though an exposed portion is worn away and to accurately maintain a location of a cross-shaped reticle by forming the cross-shaped reticle to be continued from the upper part to the lower part of the pin member. CONSTITUTION: A benchmark for a survey comprises a support structure(10), a column member(20), a pin member(30), an anchor member(40), and a concrete layer. A column insertion groove(11) is formed in the upper central part of the support structure. The lower part of the column member is inserted into the column insertion groove and a pin insertion groove(21) is formed in the upper central part of the column member. The pin member is inserted into the pin insertion groove and a cross-shaped reticle is formed in the upper part of the pin member. The anchor member covers the outer circumference of the column member and a plurality of ribs(41) is formed in the outer circumference of the anchor member. The concrete layer covers the support structure and the peripheral of the column member where the anchor member is installed.
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