Laying recommendation for Access Trap

1- Trace a generator line L, control its alignment with a rule (pay attention to the parallelism with the external generators)

2- Core the 2 ends with a milling-cutter specific to ductile iron of diameter B depending on the diameter of the collector (easy way : respect the alignment of the 2 cores & lubricate with water)

3- Cut out with the cutting machine the 2 generators of the opening in the barrel of the pipe.

a) Cut in a radial way the ductile iron up to the internal cement lining (in order to avoid the skid of the disc)

b) Finish the cut with the disc in vertical position in order to obtain sides parallel with the axis of opening of the access trap

c) Clean carefully the circumference of the opening

4- Repair the coating with a brush and an epoxy paint with fast drying

• a) Place the trap in the cut without the seal and mark the perimeter

5- Check the good positioning of the joint and fix the trap with 2 clamps

• a) Tighten gradually and alternatively the 4 bolts to obtain a perfect contact with the barrel of the pipe
• b) Put plastic plugs on the heads of the bolts

These access traps are used in protected areas (reserves) or in drinking water recovery areas. How to install them ? There are several possibilities to install pipes with access traps in the chimneys:

1- Prefabricated chimney : chimney with connection coupling without block stops

2- Prefabricated chimney: pipe with welded puddle flange. This version makes it possible to run the pipe in the chimney before the installation

3- Chimney fabricated on site: the system of connection Frank or Kröner makes it possible to run the pipe on site. The sealing will be ensured by a flexible system of rubber flange fixed by clamps

4- Chimney fabricated on site with a gauge to keep space enough for assembling the pipes after the installation of the manhole: realizable with a system of modular sealing joint type LINK-SEAL