６．２．１ 地下管线应包括埋设于地下的给水、排水、燃气、热力、工业和电力、电信等管线。除管径小于５０ｍｍ的给水管道和管径小于２００ｍｍ的排水管道外，均应进行调查与测绘。

６．２．２ 地下管线在进行调查前，必须全面搜集和整理测区范围内已有的地下管线资料，包括各种地下管线图及技术说明资料，并应按本规范的要求进行比较分析，确定其能否利用及需要补充的内容。现场踏勘核查，应察看地下管线分布和出露情况，直埋管线的地面标志保存情况，当地的地球物理条件及可能的干扰因素。并应制定地下管线调查、探查和测绘的技术计划。

６．２．３ 对沿线具有明显管线点的地下管线应进行实地调查、量测、记录管线点有关数据和填写管线调查表，并应符合下列规定：

１地下管线实地调查时应查明管线的性质、类型、走向、电缆根数、材质、建筑物及附属设施、载体特征、敷设年月、产权单位等。

２在明显管线点上应量测地下管线的埋深。

３当地下管线中心线偏离管线点时，应量测其偏距和方位。

４地下管道与管沟应量测其断面尺寸，圆形断面应量测外径，矩形断面应量取外壁的宽和高。

６．２．４ 隐蔽地下管线宜采用物探方法查明其位置、走向、埋深等，并应符合下列规定：

１探查前应进行探查方法试验和仪器检校。

２隐蔽管线点，宜在其交叉点、分支点、转折点、起终点及附属设施中心点等特征点的地面投影位置上和设计、施工特殊需要的位置进行探测。

３经物探定位的管线点应设置地面标志和绘制点位示意图。

４探查所获资料尚不能满足设计与施工要求时，应开挖调查与测绘。

６．２．５ 地下管线的测绘工作包括测量管线点与细部点的平面位置及高程，测绘管线剖面图及窨井平面图，并应符合下列规定：

１应按本规范第６．１．４条规定的测量方法测量明显管线点和隐蔽管线点标志的坐标和高程。

２宜按本规范附录Ｃ绘制剖面图。

３在地下管线交叉、分支、转折、变径、变坡处的窨井（或小室）等位置应绘制平面图。平面图内容应包括管线建筑物及附属设施（阀门、消火栓、排气、排水、排污装置等）、管线走向、窨井轮廓、井底高程等。

６．２．６在地下管线综合图上，偏距大于图上０．４ｍｍ的管线应绘出其实际位置，管径大于１ｍ者用双线表示。综合管线图以分色表示为宜，绘制地下管线综合图采用的图例、符号应按国家现行有关规定执行。

地下管线综合图上附绘制地下管线外，还应将道路、街坊以及与地下管线有参照作用的建筑物绘于图上。

６．２．７ 编制成果表应包括下列内容：

１窨井中心点成果表。

２直埋管线点成果表。

３管线建筑物细部点成果表。

６．２．８ 地下管线数字化成图应符合本规范第５．３节数字化成图的有关规定，并应满足本章的有关技术要求。各种类型的管线和设施宜分层存贮，并可根据设计需要输出专业管线图或综合管线图。

6.2.1 should include the laying of underground pipelines in the ground water supply, drainage, gas, heat, industrial and electric power, telecommunications and other pipelines. In addition to diameter of less than 50mm in diameter water supply pipes and drains less than 200mm, the survey and mapping should be carried out.

6.2.2 In conducting the investigation before the underground pipeline, you must collect and collate a comprehensive test area within the existing underground pipeline, including a variety of underground pipeline plans and technical description of data, and the requirements of this specification shall be a comparative analysis of to determine their ability to use and the need to add content. On-site reconnaissance of verification, should look at the distribution of underground pipelines and exposed situation, buried pipelines preservation of landmarks, the local geophysical conditions, and possible confounding factors. And should develop underground pipeline survey, exploration and mapping of the technical programs.

6.2.3 of the pipeline along the obvious point of field investigation should be carried out underground pipelines, measurement, recording the relevant data, and pipeline-point questionnaire filled pipeline, and should meet the following requirements:

An underground pipeline field survey to identify the pipeline should be the nature, type, direction, cable root number, material, buildings and ancillary facilities, carrier characteristics, the laying of the years of ownership units.

2 points clear lines should be measured the depth of underground pipeline.

Under the pipeline deviate from the centerline of a local three-point pipeline, we should measure its distance and orientation bias.

4 underground pipes and pipe trench should be measured dimensions of their cross-section, circular cross-section outer diameter should be measured, the amount of rectangular cross-section should be wide and high to take the outer wall.

6.2.4 hidden underground pipeline geophysical methods should be adopted to identify their location, direction, depth, etc., and should meet the following requirements:

An exploratory probe methods should be carried out before the test and calibration equipment.

2 hidden pipeline point, should, in its cross-point, branch point, turning point, terminal and ancillary facilities, such as feature points of the surface center position, and projection design, construction, location detection with special needs.

3 points by the geophysical location of the pipeline should be set on the ground signs and schematic drawing point position.

4 probe the information obtained can not meet the design and construction requirements, survey and mapping should be excavated.

6.2.5 Underground Pipeline pipeline survey and mapping work, including measuring points and detail the location and elevation point of the plane, mapping pipeline profiles and cellar well plan, and should meet the following requirements:

1 shall be the provisions of Article 6.1.4 of this standard of measurement methods to measure hidden points and lines clearly marked pipeline point coordinates and elevation.

2 in accordance with this specification in Appendix C should draw the profiles.

3 In the underground pipeline crossing, a branch, turns, adjustable, variable slope at the cellar wells (or small room) positions, such as floor plans should be drawn. Plan should include building pipelines and ancillary facilities (valves, fire hydrant, exhaust, drainage, sewage installations, etc.), pipeline direction cellar well profile, bottom elevation and so on.

6.2.6 In the combined maps of underground pipelines, the offset distance is greater than 0.4mm map of the pipeline should be mapped its physical location, diameter greater than 1m were expressed with the two-lane. Integrated pipeline plan that is appropriate for color separation, drawing a comprehensive map underground piping used in legends, symbols, should state the relevant existing provisions.

Underground pipelines attached to draw a comprehensive map underground pipes, there should be roads, residents as well as the role of underground pipelines are the light of the building painted on the map.

6.2.7 the preparation of the results table should include the following:

Focal point for the results in Table 1 cellar well.

Buried Pipeline-point results in Table 2.

3-point pipeline building detailing the results table.

6.2.8 Underground Pipeline Digital Mapping should be consistent with section 5.3 of this specification of the relevant provisions of the Digital Mapping, and should meet the relevant technical requirements of this chapter. Various types of pipelines and facilities, should tiered storage, and may need to export professional pipeline according to the design plan or integrated pipeline diagram.