求翻译：钢管使用条件分为架空敷设及埋地敷设等几种方式。架空及地沟敷设在管道安装到位后现场保温，埋地敷设采用直埋式预制保温管埋地，周围回填细砂。是什么意思？

Conditions of use into the overhead pipe laying and laid underground in several ways. Overhead and trench laying pipe in place at the scene after the insulation, the use of underground laying of prefabricated insulation pipe buried underground, the surrounding backfill sand.

Conditions of use for steel pipe laying and buried in an aerial ropeway laid several ways such as. Overhead and trench laying the pipeline installation in place after laying underground scene, use the direct heat buried prefabricated insulated pipe buried in sand, backfilling around.

The steel pipe exploitation conditions divide into are built on stilts the placing and bury lay and so on several ways.Is built on stilts and the place ditch placing after the pipelining arriving the scene heat preservation, buries lays uses buries the type prefabrication tubular holder to bury stra

Steel pipe using conditions are divided into overhead laid and buried in ground in several ways. Overhead and trench laying in the pipeline in place on-site after insulation, precast buried laying directly buried insulating pipe buried around backfill sand.

Conditions of use into the overhead pipe laying and laid underground in several ways. Overhead and trench laying pipe in place at the scene after the insulation, the use of underground laying of prefabricated insulation pipe buried underground, the surrounding backfill sand.