Actinomycetes positioning column guardrail greatest impact on the appearance of quality, master the correct way to put a line in the column positioning is crucial, according to construction drawings crash barrier column position is determined by curbs, which assumes that curbs laying, in the longitudinal (Shun direction) is absolutely smooth, the lateral direction (perpendicular to the road direction) there is no misalignment, but the actual construction is not the case, laying curbs in the longitudinal and transverse errors and 365JT design if only to put curbs press line position, fence column in the vertical direction is not straight, install guardrail pull, linear partial appears concave surface. On the construction of a highway, because it is the first time to participate in the construction of guardrail, lack of experience, though, is in strict accordance with curbs pay-off position, but the column into the vertical alignment is not good, and finally re-calibration, both a waste of manpower and resources, but also affect the construction schedule. When Ann Henan new highway construction, we identified after exploring such positioning methods: (1) First determine the column spacing to the bridge, channel, event fence mouth, interchange, level-control point distance. Column spacing is divided into two kinds of 2m and 4m, 2m spacing to enhance the column, 4m spacing for ordinary column, while the actual construction often shaped spacing, fence panels are installed, said shaped plate, shaped plate spacing due to uncertainty, so difficult to manufacture, but also affect the project, and therefore determined to minimize the profiled spacing column spacing. Such as between two bridges, the first measurement of the two bridges pitch contour spacing does not appear to see whether, if there is profiled spacing, spacing to determine the alien appears in which end or in the middle, and then record the Stake and pitch size to tailored shaped divider plate; if the column spacing may be a fraction of the number of not more than 25cm spacing can be adjusted up pillars through its distribution method. Another noteworthy issue is put on the overpass ramp positioning line, column spacing to achieve actual size adductor loud, but the size of the income and put no more than 5mm, because the board is straight, and curbs on the pitch curve, then put the pitch size and income, fence panels during installation becomes easy and smooth linear appearance. OK (2) post the longitudinal position: first in the curbs on the pitch with a red pencil to draw a horizontal line according to the column, and then drop in the direction of the cord and nail to release a line, repeatedly adjust linear, then with a red pencil in this line On the horizontal line drawn perpendicular to the vertical line, forming crosshairs when into the column, in strict accordance with the column into the distance from the center of the crosshairs, thus ensuring a degree of post straight in the longitudinal direction. Height control (3) Column: Top column is smooth, smooth guardrail determine the top surface, the column height is the biggest factor affecting guardrail linear. In the first crash barrier construction, we assume that the curbs are absolutely according to the design elevation, in accordance with the construction drawings, the top surface of the column outlet elevation high curbs 70cm, when you enter the first pillars, when driven into the top surface of the column to the road the top surface of the curb when 70cm, in hammers hammer guide rod to record the position of the pile, when a column after every fight, when the position of the pile hammer fall to a note on the description of the column has been playing in place. Such curbs top surface irregularity is reflected in the column top surface, and ultimately makes the guardrail overall irregularity, due to the level of school uprights up a lot of work and time-consuming, difficult and large, we have adopted a high degree of the following methods to control column top surface, first to the pavement design elevation calculated curbs the top surface of the design elevation, according to the top surface of the column should be the top surface of the high way out curbs 70cm top elevation calculated column, then enter the column, the column for each measurement. However, although this ensures smooth top surface of the column, but because the actual elevation between the road surface and the design elevation errors exist, and the error is large, so there will be a line from the curbs column top surface height inconsistencies, we Zhengzhou Xinzheng highway Sometimes the construction of such a discharge line sections, and some columns from the top surface of the top surface of the stone edge is greater than 70cm, and some less than 70cm, also affect the appearance, but this method is more complicated. Wuhan highway fence www.ajwy.com.cn