CN-121976594-A - Method for preventing sewage from overflowing back by adopting overflow pipe in sewer of residential building

CN121976594ACN 121976594 ACN121976594 ACN 121976594ACN-121976594-A

Abstract

The invention provides a method for preventing sewage from overflowing back by adopting overflow pipes in a sewer of a residential building, which belongs to the technical field of buildings, the invention realizes unpowered automatic diversion by utilizing throat negative pressure by installing a venturi pressurizing overflow assembly on a main drainage vertical pipe, and is matched with a double-probe ultrasonic liquid level monitoring assembly to trigger the overflow channel to be opened in advance according to the water level rising rate, meanwhile, the ventilation vertical pipes are arranged to balance the pressure difference of all floors, the water seal type anti-backflow valve assembly is arranged at the bottom to form double protection, the automatic air regulating valve and the vacuum breaker are arranged in the overflow pipeline to ensure smooth drainage, and the technical problem that sewage reversely overflows to low-floor households due to overload of the main drainage vertical pipes when the residential building drainage system is in heavy rain or water peak is solved.

Inventors

Che Yunbing
WANG DONGBO
WANG HAIBO
FAN JIAN
LIU YANG

Assignees

青岛市民用建筑设计院有限公司

Dates

Publication Date: 20260505
Application Date: 20260126

Claims (10)

1. A method for preventing sewage from flowing back by overflow pipe in sewer of resident building features that an overflow interface is opened at the position 0.8-1.2 m from bottom of main water drain vertical pipe, a Venturi pressurizing overflow assembly is installed, a dual-probe ultrasonic liquid level monitor assembly is installed at the position 1.5-2 m from bottom in main water drain vertical pipe, the water level rising rate is calculated by water level rising rate calculation equation set according to the water level data collected by dual-probe ultrasonic liquid level monitor assembly, the fast water level rising condition or slow water level rising condition is determined according to water level rising rate, the overflow channel of Venturi pressurizing overflow assembly is opened, an automatic air regulating valve is installed at the top of throat of Venturi pressurizing overflow assembly, a vacuum breaker is installed at the tail end of overflow pipeline, a ventilating vertical pipe connection point is installed at the position every 5-8 m from main water drain vertical pipe, and a water seal type reverse-flowing preventing valve assembly is installed at the junction of water drain branch pipe of basement and main water drain vertical pipe.
2. The method for preventing sewage from overflowing by adopting an overflow pipe for a residential building sewer according to claim 1, wherein the diameter of an inlet of a contraction section of the venturi supercharging overflow assembly is consistent with the inner diameter of the main drainage vertical pipe, the diameter of a throat is 0.6 to 0.7 times of the diameter of the inlet of the contraction section, and the length of the throat is 2 to 3 times of the diameter of the throat.
3. The method for preventing sewage from overflowing by adopting an overflow pipe in a sewer of a residential building according to claim 2, wherein the upper probe of the double-probe ultrasonic liquid level monitoring assembly is arranged at a position 80 to 120mm above a warning water line, the lower probe is arranged at a position of the warning water line, and the vertical distance between the upper probe and the lower probe is 80 to 120mm.
4. A method for preventing sewage from overflowing by using an overflow pipe in a sewer of a residential building according to claim 3, wherein the rapid water level rising condition is judged when the water level rising rate is greater than 15mm/min, and the slow water level rising condition is judged when the water level rising rate is less than or equal to 15 mm/min.
5. The method for preventing sewage from overflowing by using an overflow pipe for a sewer of a residential building according to claim 4, wherein the overflow channel is opened when a rapid water level rising condition is determined and the lower probe detects that the water level reaches a warning water level, and the overflow channel is opened when a slow water level rising condition is determined and the upper probe detects that the water level exceeds 60 to 80mm above the warning water level.
6. The method for preventing sewage from overflowing by using an overflow pipe for a sewer of a residential building according to claim 5, wherein the automatic air-conditioning valve is opened in an air suction mode when the internal pressure of the overflow pipe is lower than minus 2kPa, and is opened in an air discharge mode when the internal pressure of the overflow pipe is higher than plus 1 kPa.
7. The method for preventing sewage from overflowing by using an overflow pipe for a sewer of a residential building according to claim 6, wherein the vacuum breaker is installed at a position of 0.3 to 0.5 meter from the inlet of the spare drainage pipe at the end of the overflow pipe, and the starting negative pressure threshold is minus 1.5 to minus 3kPa.
8. The method for preventing sewage from overflowing by adopting an overflow pipe in a residential building sewer according to claim 7, wherein the top of the ventilation vertical pipe is communicated with the atmosphere, the bottom of the ventilation vertical pipe is communicated with the main drainage vertical pipe, and the inner diameter of the ventilation vertical pipe is 0.3 to 0.4 times of that of the main drainage vertical pipe.
9. The method for preventing sewage from overflowing by adopting an overflow pipe for a sewer of a residential building according to claim 8, wherein the water level rising rate calculation equation set comprises a water level rising rate equation, an overflow start pre-judging time equation and a venturi throat negative pressure equation.
10. The method for preventing sewage from overflowing by using an overflow pipe for a sewer of a residential building according to claim 9, wherein the expression of the water level rising rate equation is that the ratio of the water level rising rate divided by 15mm/min is equal to the ratio of the quotient of the difference of the upper probe water level data minus the lower probe water level data divided by the vertical distance between the upper probe and the lower probe divided by 0.15.

Description

Method for preventing sewage from overflowing back by adopting overflow pipe in sewer of residential building Technical Field The invention belongs to the technical field of buildings, and particularly relates to a method for preventing sewage from overflowing back by adopting an overflow pipe in a sewer of a residential building. Background Residential building drainage systems generally adopt a single main drainage vertical pipe to collect domestic sewage of each floor and discharge the domestic sewage to a municipal pipe network, so that drainage requirements can be met under normal water use conditions. Traditional anti-overflow measures mainly include modes such as increase main drainage riser pipe diameter, set up mechanical lift pump station or installation one-way check valve, and wherein increase pipe diameter is restricted by building space and construction transformation is with high costs, and mechanical pump station relies on electric drive to have the power failure risk and maintain frequently, and the one-way check valve only can block against the flow but can't solve upstream pipeline pressure accumulation problem. In the current urban heavy rain frequent occurrence and resident concentrated water use peak period, the instantaneous flow of the main drainage vertical pipe is increased rapidly to 80 to 120kPa, the design bearing capacity of the far ultra-low floor drainage branch pipe 20 to 30kPa is realized, the pressure difference directly breaks through the water seal of the water storage bend of the sanitary ware and flows back into the room, and the pipeline pressure is difficult to be released in time due to response lag or insufficient diversion capacity in the traditional technical measures. That is, the prior art has the technical problem that the sewage is overflowed to low-floor households due to overload of the main drainage vertical pipe when the residential building drainage system is in heavy rain or water use peak. Disclosure of Invention In view of the above, the invention provides a method for preventing sewage from overflowing by adopting an overflow pipe in a sewer of a residential building, which can solve the technical problem that in the prior art, sewage overflows to a resident on a low floor due to overload of a main drainage vertical pipe when a residential building drainage system is in heavy rain or water use peak. The invention provides a method for preventing sewage from overflowing by adopting overflow pipes in a resident building sewer, which is characterized in that an overflow interface is arranged at a position 0.8-1.2 m away from the bottom of a main drainage vertical pipe, a Venturi pressurizing overflow assembly is arranged at a position 1.5-2 m away from the bottom in the main drainage vertical pipe, a double-probe ultrasonic liquid level monitoring assembly is arranged at the position, according to water level data acquired by the double-probe ultrasonic liquid level monitoring assembly, a water level rising rate is calculated through a water level rising rate calculation equation set, a rapid water level rising working condition or a slow water level rising working condition is judged according to the water level rising rate, an overflow channel of the Venturi pressurizing overflow assembly is started, an automatic air regulating valve is arranged at the top end of a throat part of the Venturi pressurizing overflow assembly, a vacuum breaker is arranged at the tail end of the overflow pipeline, a ventilating vertical pipe connecting point is arranged at the position 5-8 m away from the height of the main drainage vertical pipe, and a water seal type anti-backflow valve assembly is arranged at the connecting position of a water draining branch pipe of a basement and the main drainage vertical pipe. The inlet diameter of the contraction section of the Venturi pressurizing overflow assembly is consistent with the inner diameter of the main drainage vertical pipe, the diameter of the throat is 0.6 to 0.7 times of the inlet diameter of the contraction section, and the length of the throat is 2 to 3 times of the diameter of the throat. The upper probe of the double-probe ultrasonic liquid level monitoring assembly is arranged at the position 80-120 mm above the warning water level, the lower probe is arranged at the position of the warning water level, and the vertical distance between the upper probe and the lower probe is 80-120 mm. And when the water level rising rate is smaller than or equal to 15mm/min, the rapid water level rising working condition is judged, and when the water level rising rate is smaller than or equal to 15mm/min, the slow water level rising working condition is judged. And when the rapid water level rising working condition is judged, the upper probe detects that the water level exceeds the warning water level by 60-80 mm, the overflow channel is opened. Wherein the automatic air-conditioning valve opens the suction mode when the ove