Installation and use of socket glass fiber reinforced plastic power and communication cable protection tubes and multi-tube, multi-layer and multi-column system. 1. Excavation of cable trench 2. Basic treatment of trench bottom 3. Connection and laying of pipes 4. Laying of multi-layer and multi-column pipes 5. Covering of backfill soil 6. Transportation and stacking of glass tubes I. Excavation of cable trench The excavation width (b) and depth (h) of cable trench shall be determined according to the number of layers of protection pipes to be buried. The top of H1 pipe shall not be less than 50cm away from the ground, and it is generally of standard trench width. II. Basic knowledge of ditch bottom Underground conduit generally bears the load of its covering soil and external additional load (the weight of the main traffic vehicle and its cargo). Therefore, we should attach great importance to the foundation treatment of the ditch bottom, and the bad foundation; Kidney will cause Z-shaped displacement of catheter and local stress concentration, which will threaten the safety of cable. A. for general soil sections, it is only necessary to lay 5 o-l o 0 mm yellow sand layer at the bottom of the ditch, and compact and level it. B. for sections with poor soil layer in Shaofen, it is only necessary to fill 50-10 o mm with lime mortar or cement mortar at the bottom of the ditch, and compact and level it. Third, the connection of protection pipes The connection operation method of laying pipes is convenient, as long as; Insert the insertion end of the odd pipe into the receiving end of the pipe. The specific operation steps are as follows: a. Wipe the outer surface of the insertion end, the inner surface of the receiving end and the rubber sealing ring of the pipe with a cleaning rag. B. Connection and laying of pipes: firstly, arrange the pipes, and then insert them in sequence. The piping method can be operated by machinery (intubation machine) or inserted by hammering as shown in the following figure. 4. Laying multi-layer and multi-row pipes After the first layer of pipes is laid, it can be covered with concrete slurry (cement, melon seeds, schist and yellow sand) with a thickness of about 3 cm. After that, the second layer of pipes can be laid (pipes can be discharged without waiting for concrete to dry) on the second layer of pipes, and concrete can be covered with the same method and thickness, so that pipes can be discharged in 3-5-7 layers. However, it is best to cover the concrete on the top layer of the drainage pipe with a thickness of 5 cm, so that it can pass through the cable after 7-10 days of maintenance. 5. Covering of Backfill Soil After the drainage pipe is finished, the backfill soil can be covered and compacted and leveled until the road surface is flush. VI. Transportation and stacking of FRP pipes.