1, reference standards:
Glass reinforced septic tanks have no national standards or industry standards, but the capacity of glass septic tanks against external pressure can be used as standard: "water supply and drainage, buried glass fiber reinforced plastic mortar pipe, pipe structure design". The calculation method of underground pipeline is used to calculate the glass septic tank. Compared with the pipeline, the glass reinforced septic tank has a head at both ends, and the anti pressure capability of the septic tank will be increased.
2 、 stiffness and bearing
The septic tank stiffness is the theoretical basis of ground bearing capacity after the direct reflection. According to the pool stiffness, using the CECS190 standard, to evaluate the safety of the septic tank.
For example, the diameter of DN3200mm; stiffness is 7500Pa; pool top soil 1m depth, in accordance with national standards for qualified backfill, the soil reaction modulus is 40MPa, the vehicle load is steam -40. According to ASME standard and CECS190 calculation, it can meet the requirement of steam -40 load.
3, select the reminder
A, metal square tube as an inner support product, is a short-lived product, can not be used.
Because the metal square is wrapped in FRP, but the corrosion is still serious. Even if just beginning to use, with metal corrosion, pool stiffness will continue to decline, resulting in the collapse of the tank body.
B, not to the Stiffness Evaluation Based on pool products, can not be used.
Because the glass steel septic tank Market, someone is trying to develop industry standards, the detection of septic tank pressure resistance, with "heavy vehicle detection based on rolling" after the construction of the ground, neither detected nor detection of septic tank, a rolling construction, but not as qualified products on the basis of. Therefore, this unscientific and unscientific urban construction industry standard has not been able to pass and release.