The connection between the pipe and the inspection well adopts flexible connection. When the requirement is not high, the pipe can be directly connected into the shaft wall. HDPE double-wall bellows should be connected to the inspection well after backfilling to prevent pipe shrinkage and expansion due to temperature changes from damaging the well wall structure.
(1) The installation position of the rubber ring needs to be in the slot between the second and third ripples of the socket. The number of sealing rings to be installed depends on the design requirements. If two sealing rings are used, it is recommended that a ripple be separated between the two sealing rings and not put together.
(2) before the interface to do a good job of preparation, steel plastic pipe manufacturers will first HDPE double wall corrugated pipe socket socket inside and outside the surface clean, in the socket into the sealing ring, and then in the socket working face and rubber ring surface coated with lubricant (generally with soap water can also be), insert direction for the direction of water flow, The HDPE double-wall bellows pipe will be slowly inserted into the socket until the bottom with manual labor or wooden baffle set with crowbar to align the middle line of the socket.
(3) After the interface is completed, the reserved groove is then filled with the same soil;
(4) socket pipe installation needs to socket along the water flow direction, the socket against the water flow direction, from the downstream to the upstream installation; . One goes clockwise and one goes counterclockwise. Two phase jam.
(5)HDPE double-wall corrugated pipe pipe should be laid in a straight line, and the allowable Angle of two adjacent pipe axes should not be greater than 2 degrees. HDPE double wall bellows pipe shaft that has been arranged to prevent the interface from closing.
If the line position needs to be moved during installation, pipe stability measures must be adopted. The woven bag can be filled with sand, sealed and pressed on the top of the double-wall bellows pipe. After the pipeline interface, it is necessary to check the bottom depth and axis of the pipe to make it meet the requirements. If there is displacement, suspension and pulling out, it needs to be reworked.
Problems to pay attention to when backfilling soil:
(1) The axillary Angle (within the range of 2D Angle) should be filled with medium sand and coarse sand;
(2) Manual backfill is required from the base position to 0.7m above the top slot of the HDPE double-wall corrugated pipe;
(3) The HDPE double-wall bellows above 0.7m can be mechanically backfilled from both sides of the pipe axis at the same time.
(4) The backfill soil used in each part of the trough edge. Suitable for compaction degree according to design requirements or according to CECS122:2001 technical specification requirements.
Matters needing attention
1. When the HDPE double-wall corrugated pipe pipe and the inspection well are connected by brick or concrete directly, the intermediary layer can be used. It should be in the pipeline and the inspection well connected with the same plastic adhesive, coarse sand made of intermediary layer, and then with cement mortar built into the inspection well wall.
2, HDPE double-wall bellows pipe and inspection well connection, need to choose flexible interface, can also choose to connect intubation, depending on the specific situation determined by the planning, inspection well bottom bottom, should be steep with the pipeline bottom cushion.
3, HDPE double wall corrugated pipe pipe in soft soil foundation or low-lying, marsh, high groundwater level of the lot, should choose the way of short pipe connection and inspection well connection.
