1、当地沟底部上层的承载力≤60KPa时，地沟底部应加垫素混凝土层。
1. When the bearing capacity of the upper layer at the bottom of the ditch is less than 60KPa, plain concrete layer should be added at the bottom of the ditch.
2、C15素混凝土层底部土层应先夯实后，再浇混凝土，混凝土层外表应润滑平整。当底部土层为湿陷性土质时，应换上(深1.0m左右)并夯实。
2. The soil layer at the bottom of C15 plain concrete layer should be compacted before concrete is poured. The surface of the concrete layer should be smooth and lubricated. When the bottom soil is collapsible, it should be replaced (about 1.0 m deep) and compacted.
3、地沟内接头处的地沟宽度和深度应比非接头处增加250～300mm 。
3. The width and depth of the ditch at the joint of the ditch should be 250-300 mm higher than that at the non-joint.
4、设有波纹补偿器的位置，波纹补偿器底部的土层标高应依据补偿器的实践到货尺寸肯定。
4. The location of the corrugated compensator and the soil elevation at the bottom of the corrugated compensator should be determined according to the actual arrival size of the compensator.
5、沟底上层沿管线的坡度应保证同管道的坡度分歧。
5. The gradient of the upper layer of ditch bottom along the pipeline should be different from that of the same pipeline.
6、直埋管道四周100mm用细砂境实。砂粒直径应不大于8mm，砂层中不可合有粘土、砖、石、铁件等杂物。
6. Fine sand is used around 100 mm of buried pipeline. The diameter of sand should be no more than 8 mm. Clay, brick, stone, iron and other impurities should not be mixed in the sand layer.
7、当管道理设在炉渣、杂物等腐蚀性较强的土层地段时，回填土应换以腐蚀性较小的土壤，并分层夯实。
7. When the pipeline is located in the corrosive soil such as slag and sundries, the backfill should be replaced by the less corrosive soil and compacted layer by layer.
8、沟槽必需做好排水工作，可采用排水沟，集水池用水泵扫除。
8. The groove must be drained well. Drainage ditches can be used and water pumps can be used to clean the catchment pool.
聚氨酯保温钢管管道的装置必需在管沟开挖和沟底土层处置合格后停止。装置时留意以下请求；
The installation of polyurethane insulating steel pipe must be stopped after the ditch excavation and the disposal of the soil layer at the bottom of the ditch are qualified. Note the following requests when installing the device.
1、管道下沟前需对其处外表的防腐层停止认真检查，发现防腐层有损坏的，应及时停止处置。
1. Before the pipeline goes down the ditch, it is necessary to stop carefully inspecting the anticorrosive coatings on its exterior. If it is found that the anticorrosive coatings are damaged, it should stop disposing of them in time.
2、管道对接时，应保证管道设计轴线及坡度。
2. Pipeline design axis and slope should be guaranteed when docking.
3、预制保温管可单根吊入沟内装置，也可两根或多根组织焊完后吊装。当组焊管段较长时，宜用两台或多台吊车抬管下管，吊点的位置按均衡条件选定。严禁将管道直接推入沟内。
3. Prefabricated insulating pipes can be hoisted into ditches by a single device, or two or more tissues can be hoisted after welding. When the welded pipe section is long, two or more cranes should be used to lift the lower pipe, and the location of the hanging points should be selected according to the equilibrium conditions. It is strictly forbidden to push the pipeline directly into the ditch.
4、工作钢管焊接完成并经检验合格后，即可处置接头的保温、外套管衔接的工作，可先立模停止聚氨脂发泡，再用热缩带将接头局部整体密封，两端和直管各搭接100mm；也可先将外套管对焊处置，并经密封检查合格后开孔发泡。
4. After the welding of the working steel pipe is completed and the inspection is qualified, the heat preservation of the joint and the connection of the outer sleeve can be handled. The polyurethane foaming can be stopped by erecting the die, then the joint can be sealed locally and integrally with the heat shrinkage belt, and the ends and straight pipes can be lapped 100 mm each. The outer sleeve can also be butt welded and handled first, and the sealing inspection is qualified before opening and foaming.
5、当日工程竣工时应将管端用盲板封堵，以防泥、水进入管内。
5. When the project is completed on that day, the pipe end shall be sealed with blind board to prevent mud and water from entering the pipe.
6、预制保温管有冷装置、热预应力装置和一次性补偿器装置三种方式。
6. Prefabricated insulating pipes have three ways: cooling device, thermal prestressing device and disposable compensator device.
7、冷装置就是直接将管段各段衔接，并经检验合格后按规范回填即可；
7. The cooling device is to connect the segments of the pipe directly and fill them back according to the specifications after passing the inspection.
8、热预应力装置是先将管道预热工作温度的60％时焊接，然后回填夯实。
8. The thermal prestressing device is to weld the pipeline when it is preheated to 60% of the working temperature, and then backfill and tamping.
9、一次性补偿器必需在管道升温工作温度的60％时焊接，再停止回填和夯实。
9. The disposable compensator must be welded when the pipeline is heated to 60% of the working temperature, and then stop backfilling and tamping.
This article is from: polyurethane insulation pipe manufacturers more content please click: http://www.sdhpgy.com, we will provide you with a satisfactory service to ask questions, welcome your call!
