Device for avoiding the backflow of water from a sewer pipe into a sewer pipe of a building

Abstract

The invention relates to a device for preventing backflow of water from a sewer pipe into a wastewater pipe (1) of a structure, in particular a building, comprising a wastewater pipe (1) that opens into a sewer pipe (2), wherein the wastewater pipe (1) has an overflow element (4) from which water from the wastewater pipe (1) can flow into a lower pump shaft (14), wherein the overflow element (4) is arranged and designed such that, under normal conditions, wastewater in the wastewater pipe (1) can flow unhindered to the sewer pipe (2) and, in a backflow condition, water entering from the sewer pipe (2) into the wastewater pipe (1) flows into the pump shaft (14) via the overflow element (4), wherein a float (7) is arranged in the pump shaft (14), the position of which can be changed depending on the water level in the pump shaft (14), wherein the float (7) is connected to a gate valve (17), in particular a plate gate valve, such that is connected in a force-transmitting manner,that the valve (17) can be inserted into the flow path of the wastewater into the sewer pipe (1) when the water level in the pump shaft (14) rises above a predefined threshold value, and the flow of water into or out of the sewer pipe (2) can be interrupted.

Description

[0001] The invention relates to a device for preventing backflow of water into the sewage pipe of a structure, in particular a building, according to the preamble of patent claim 1.

[0002] Buildings, such as residential buildings, single-family homes, or building complexes, always have at least one sewer outlet or sewer pipe, through which the wastewater discharged from the building is conveyed via a wastewater pipe to a sewer pipe or the sewer. If the building's sewer outlet is located below the backflow level of the public sewer system, a backflow in the building's sewer outlet can occur during periods of heavy rainfall or flooding, for example. This is caused by the rising water level in the public sewer and, subsequently, by the discharge of domestic wastewater.

[0003] WO2013037372 A and US 2739662A each disclose a device for preventing the backflow of water from a sewer pipe into a wastewater pipe of a building. The device comprises a wastewater pipe that opens into a sewer pipe, wherein the sewer pipe has an overflow element from which water from the sewer pipe can flow into a pumping shaft located below. The overflow element is arranged and designed such that, in a normal state, wastewater in the sewer pipe can flow unhindered to the sewer pipe, and in a backflow state, water entering the sewer pipe from the sewer pipe flows into the pumping shaft via the overflow element.

[0004] Various devices, in particular backflow valves, are known from the state of the art, which are intended to prevent the backflow of water or wastewater from the sewer pipe into the wastewater pipe of the object or building.

[0005] Furthermore, it is known from the prior art that sensors are installed in the sewer pipe which, in the event of a backflow of sewage into the sewer pipe, activate electrical blocking elements in the sewer pipe and thereby prevent the backflow of sewage or water into the sewer pipe.

[0006] The disadvantage of the systems known from the prior art is that they cannot reliably guarantee functionality, especially in the event of a power failure. Furthermore, the devices known from the prior art also have the disadvantage that if there is a backflow and the sewer pipe is blocked, no more wastewater can be discharged from the building or property. For example, toilets cannot be used in the event of a backflow because the resulting wastewater cannot be drained away.

[0007] The object of the present invention is therefore to guarantee a safe drainage of the wastewater and to provide a fail-safe backflow protection system.

[0008] This object is achieved by a device according to the preamble of patent claim 1 with the characterizing features. According to the invention, a floating body is arranged in the pumping shaft, the position of which can be changed depending on the water level in the pumping shaft. The floating body is connected to a slide valve, in particular a plate slide valve, in such a way that the slide valve can be pushed into the flow path of the wastewater into the sewer pipe when the water level in the pumping shaft rises above a predefined threshold, and the flow of water into or out of the sewer pipe can be interrupted.

[0009] When the water level in the pumping shaft rises, the float valve located in the pumping shaft is raised by the backflow, automatically actuating the associated gate valve. The gate valve is pushed into the flow path of the wastewater into the sewer pipe, preventing backflow from the sewer pipe into the sewer pipe. The arrangement according to the invention therefore provides a fail-safe device for preventing water backflow in the sewer pipe that is independent of electrical power.

[0010] Further advantages of the device according to the invention are defined in more detail by the dependent claims: In order to reliably prevent the wastewater from backing up into the wastewater pipe, it can be provided that the floating body has a shape and / or a volume such that a force of 1000 N to 4000 N, in particular 1500 N to 3500 N, can be exerted on the slide, so that any solids present in the wastewater pipe can be severed by the slide, and / or that the slide is designed as a stainless steel slide plate, the edge of which facing the wastewater pipe is designed as a cutting edge. This design ensures that the slide can be reliably introduced into the wastewater pipe and that any solids present in the wastewater pipe are displaced or severed by the slide.In this way, any solids are pushed out of the slide's adjustment path by the slide or are split when the slide is extended and transported out of the adjustment path or the slide's path.

[0011] In order to be able to reliably drain the wastewater entering the pumping shaft from the pumping shaft, it can be provided that a drain pump with a pump line connected to the drain pump is arranged in the pumping shaft, wherein the pump line opens into the wastewater pipe behind the slide valve in the flow direction of the wastewater, in particular tangentially via an expansion shaft, wherein the drain pump is controllable in particular via a water level probe arranged in the pumping shaft, in particular preferably a float switch. If the slide valve is pushed into the wastewater pipe in a backflow condition, the wastewater then entering falls into the pumping shaft via the overflow element and thereby increases the water level in the pumping shaft. If the water level in the pumping shaft then exceeds a predefined water level, this is registered by the water level probe and activates the drain pump.The drain pump then pumps the wastewater in the pumping shaft through the pump line into the sewer pipe at positive pressure. This allows the water to continue to be easily drained out of the building or property, even in the event of backflow.

[0012] Advantageously, it can be provided that a number of check valves, in particular two check valves, are arranged in the pump line to prevent backflow of waste water into the pump line.

[0013] In order to be able to continue to drain wastewater from the building in the event of a power failure in which any pumps cannot be activated, the pumping shaft can be designed as a buffer storage tank in such a way that in the event of backflow, when the flow of wastewater into the sewer pipe is blocked by the valve, wastewater from the sewer pipe can enter the pumping shaft via the overflow element and can be collected and stored in the pumping shaft.

[0014] In order to be able to easily detect the presence of the backflow condition, it can be provided that a probe is arranged in the wastewater pipe in the flow direction of the wastewater behind the valve, with which the backflow condition can be detected.

[0015] Since gate valves, pumps, and other mechanical devices can fail or be damaged if operated infrequently, an advantageous embodiment of the present invention provides for the gate valve, in particular, to be operated at regular intervals, even when no backwater condition exists. According to the invention, the device comprises a storage tank, which is connected to the pump shaft via an overflow. A system pump is arranged in the storage tank, with which water can be pumped from the storage tank into the pump shaft via a pressure pipe.

[0016] To ensure that there is always enough water in the storage tank for maintenance operations, the overflow can be arranged below the water level of the water level probe at which the drain pump is switched on.

[0017] Advantageously, it can be provided that the pressure pipe has a flushing device, in particular flushing nozzles, which opens into the individual parts of the device, in particular the pump shaft, the drain pump, its suction area and / or into the area of the water level probe, the probe in the pump line above the check valves, in order to flush out any solids from individual parts of the device, in particular the pump shaft, the drain pump, its suction area, the water level probe, the probe 5 and / or the check valves.

[0018] In order to reliably prevent a backflow of wastewater into the pumping line, the pumping line can be laid above the backflow level of the sewer pipe.

[0019] According to the invention, it can advantageously be provided that the device has a control unit which is connected to the water level probe and the probe via electrical lines, wherein the state of the water level probe and the probe is supplied to the control unit, wherein the control is connected to the drain pump and the system pump, wherein the drain pump and the system pump are controllable via the control unit.

[0020] To ensure safe maintenance operation, the control unit can be designed such that the system pump can be switched to a maintenance mode at predefined intervals, in particular once a week. In the maintenance mode, the water in the storage tank can be pumped into the pump shaft, thereby lifting the float in the pump shaft and inserting the slide valve into the wastewater pipe. This allows maintenance operation to be carried out easily, with the water in the storage tank raising the water level in the pump shaft and regularly actuating the float or slide valve. This effectively and particularly easily prevents failure through regular operation or use.

[0021] To easily inform maintenance personnel about the status of the device, the device, in particular the control unit, can be provided with a communication device that can be used to issue a warning when a previously defined water level is reached in the sewer pipe, in particular when a backflow condition occurs. The communication device preferably has a GSM module, in particular one powered by a battery, that can be used to issue a message when a backflow condition occurs. The battery operation of the communication device preferably allows a message to be sent to maintenance personnel or the owners of the property or building even in the event of a power failure.

[0022] In order to be able to easily adapt the overflow element to the prevailing water quantities in the sewage pipe, it can be provided that the overflow element is designed to be adjustable in height, so that the height of the water in the sewage pipe can be changed when water from the sewage pipe enters the pump shaft.

[0023] A simple installation of the device in buildings or houses can be made possible by the device being designed as a shaft and having a number of covers through which the individual elements of the device, in particular the pump shaft, the control unit, the drain pump, the system pump, the slide valve, the check valve and / or the storage tank, are accessible from the surroundings of the device.

[0024] In order to ensure fail-safe operation of the drain pumps, it can be provided that a plurality of drain pumps, in particular two drain pumps, are arranged in the pump shaft, each drain pump having a pump line, each pump line opening into the drain pipe behind the slide valve in the flow direction of the wastewater, in particular tangentially via an expansion shaft.

[0025] Further advantages and embodiments of the invention will become apparent from the description and the accompanying drawings.

[0026] The invention is schematically illustrated below with reference to particularly advantageous, but not restrictive, embodiments in the drawings and is described by way of example with reference to the drawings: Fig. 1 shows a device according to the invention in normal operation in a sectional view. Fig. 2 shows the device according to the invention according to Fig. 1 in top view. Fig. 3 shows the device when wastewater enters the sewer pipe. Fig. 4 shows the device with the slide closed. Fig. 5 shows the device in the backflow state when the water level in the pump shaft is lowered by the drain pump. Fig. 6 shows the device during transition to normal operation. Fig. 7 shows the device in test run or maintenance mode.

[0027] In the Fig. 1 and 2 is a preferred embodiment of the device according to the invention for preventing the backflow of waste water from a sewer into a building in a sectional view ( Fig. 1 ) and a top view ( Fig. 2 ). The device according to the invention comprises a wastewater pipe 1, in which wastewater from a structure, for example a building, a single-family house, an apartment building or other objects is conducted. The wastewater pipe 1 opens into a sewer pipe 2, in which the wastewater is conveyed along the Fig. 1 The water is then fed into the public sewer and discharged into the public sewer system by means of the arrows shown. An overflow element 4 is provided in the sewer pipe 1 - in the Fig. 1 In the embodiment shown, a so-called "overflow edge" is arranged, through which water or the wastewater carried in the sewer pipe 1 can be discharged or introduced into a pumping shaft 14 arranged below the sewer pipe 1 when a defined wastewater level is present in the sewer pipe 1. The overflow element 4 is designed such that during normal operation, i.e. when wastewater is conducted via the sewer pipe 1 into the sewer pipe 2, no wastewater enters the pumping shaft 14 via the overflow element 4. However, when the water level in the sewer pipe 1 rises, for example when water backs up from the sewer pipe 2 into the sewer pipe 1, this water then enters the pumping shaft 14 via the overflow element 4. Backflow is referred to as the condition in which the wastewater from the sewer pipe 1 can no longer flow unhindered into the sewer pipe 2, but conversely, water is forced from the sewer pipe 2 into the sewer pipe 1.For example, during heavy rainfall or flooding, unhindered backflow of wastewater into the building's wastewater pipe 1 or the building itself can lead to damage and contamination from wastewater escaping from drains or sanitary facilities. To prevent harmful backflow, the water or wastewater entering the wastewater pipe 1 from the sewer pipe 2 in the event of a backflow condition is transported via the overflow element 4 into the pumping shaft 14 and thus cannot penetrate further into the building via the wastewater pipe 1.

[0028] Furthermore, a float 7 is arranged in the pump shaft 14, which changes its position with respect to the height of the pump shaft 14 depending on the water level in the pump shaft 14 and is raised when the water level in the pump shaft 14 rises. The float 7 is connected to a slide 17 in a force-transmitting manner - in the embodiment shown via a rod. The slide 17 is arranged in the sewer pipe 1, so that when the water level in the pump shaft 14 rises, the float 7 is raised and inserts the slide 17 into the sewer pipe 1. The slide 17 then interrupts the flow of water from the sewer pipe 2 into the sewer pipe 1 or to the overflow element 4. In alternative embodiments not shown, the slide 17 can also be connected to the floating body 7 via cables, chain pull elements, coupling rods or other force-transmitting elements, or can also be introduced into the sewage pipe 1 from above.

[0029] In preferred embodiments, the floating body 7 is adapted to the size of the pump shaft 14, with its shape and volume being adapted such that a defined force is applied to the slide valve 17. The force is advantageously between 1000 N and 4000 N, in particular between 1500 N and 3500 N. This enables the slide valve 17 to reliably enter the sewage pipe 1 and any objects located in the sewage pipe 1 to be expelled from the travel path of the slide valve 17 or to be severed by it. The floating body 7 can, for example, be designed as an air-filled plastic container or as another floating body known from the prior art. Optionally, it can be provided that the edge of the slide valve 17 facing the sewage pipe 1 is designed as a cutting edge or cutting blade, and that objects present in the sewage pipe 1 are severed by the slide valve 17 in this way, thus ensuring secure closing of the slide valve 17 ora closure of the sewer pipe 1 is ensured in the event of backflow. A cutting edge of the slide 17 can be achieved, for example, by chamfering the edge of the slide 17.

[0030] Furthermore, a drain pump 11 is arranged in the pumping shaft 14, with which wastewater present in the pumping shaft 14 or water from the pumping shaft 14 can be introduced into the wastewater pipe 1 via a pumping line 12. The pumping line 12 opens into the wastewater pipe 1 or into the sewer pipe 2 in the flow direction of the wastewater in the sewer pipe 1 behind the slide valve 17, so that in the event of a backflow or backflow condition, the water from the pumping shaft 14 can be pushed via the drain pump 11 and the pumping line 12 into the wastewater pipe 1 or the sewer pipe 2. The pumping line 12 opens, as shown in Fig. 1 shown, advantageously via an expansion shaft 6 in the wastewater pipe 1 or sewer pipe 2 and is thereby pressed tangentially in the direction of the wastewater flow into the sewer pipe 2 with an overpressure generated by the drain pump 14. In Fig. 2 For this purpose, the lateral or tangential introduction of the pump line 12 into the expansion shaft 6 and further into the sewer pipe 2 is shown in a plan view.

[0031] Two check valves 8, 10 are arranged in the pump line 12. These are intended to prevent wastewater from the wastewater pipe 1 or the sewer pipe 2 from being forced through the pump line 12 into the pump shaft 14. To prevent failure of one of the two check valves 8, 10, for example due to clogging solids, they are designed in duplicate, i.e., two check valves 8, 10 are arranged in the pump line 12. Alternatively, however, only one check valve 8 can be arranged in the pump line 12.

[0032] In the following, the function of the device according to the invention is described schematically with reference to the drawings and the preferred embodiment shown therein: In Fig. 1 The device is shown in its normal state. In its normal state, the wastewater flowing out of the building flows unhindered through the wastewater pipe 1 into the sewer pipe 2 and is thus discharged from the building into the public sewer. However, if wastewater or rainwater flows out, as shown in Fig. 3 shown, via the sewer pipe 2 into the wastewater pipe 1, the water level in the wastewater pipe 1 rises, so that it rises over the overflow edge or the overflow element 4 and the wastewater flows over the overflow element 4 into the pumping shaft 14. The wastewater entering the pumping shaft 14 then raises the water level or water level in the pumping shaft 14, whereby the float 7 arranged in the pumping shaft 14 is raised along with the water level in the pumping shaft 14. By lifting the float 7, a force is applied to the slide 17 and this is adjusted and gradually enters the wastewater pipe 1, so that the flow of water or wastewater from the sewer pipe 2 into the wastewater pipe 1 and vice versa is prevented. If a previously defined water level or water level is present in the pumping shaft 14, the slide 17, as shown in Fig. 3 shown, is completely inserted into the sewer pipe 1 and the backflow or backflow of water or sewage from the sewer pipe 2 into the sewer pipe 1 is completely prevented and the device is in the backflow state.

[0033] If wastewater continues to flow from the building into the wastewater pipe 1, as in Fig. 4 shown, this is led over the overflow edge or the overflow element 4 into the pump shaft 14 and further increases the water level in the pump shaft 14. If the water level or the water level in the pump shaft 14 is raised above a predefined level, this is detected by a water level probe 21 arranged in the pump shaft 14 and the drain pump 11 is activated via a control unit 24. When the drain pump 11 is activated, the wastewater from the pump shaft 14 is pumped or pressed via the pump line 12 into the expansion shaft 6 or the sewer pipe 2 and can thus be conveyed from the pump shaft 14 against the backflow pressure of the wastewater from the sewer pipe 2 in the direction of the wastewater pipe 1. The wastewater discharged from the pump shaft 14 via the drain pump 11 lowers the water level in the pump shaft 14 again, which is again detected by the water level probe 21.

[0034] If the water level in the pump shaft 14 falls below a previously defined level, this is registered by the water level probe and the drain pump 11 is then switched off and the slide valve 17 or the float 7 prevents the backflow of wastewater from the sewer pipe 2 into the sewer pipe 1. In the sewer pipe 1, in the flow direction of the wastewater into the sewer pipe 2, behind the slide valve 17, a probe 5 is arranged, which detects the backflow condition or indicates whether water is being pushed from the sewer pipe 2 into the sewer pipe 1. The probe 5 can, for example, be designed as a float switch or float probe and can be actuated or register a backflow condition or when the sewer pipe 1 is full behind the slide valve 17. If the probe 5, as shown in Fig. 6 shown, detects that no more wastewater is entering the sewer pipe 1 from the sewer pipe 2, the drain pump 11 is switched on or continued to operate by the control unit 24 and the water level in the pump shaft 14 is further lowered. When the water level in the pump shaft 14 drops, the float 7 is then lowered again and the slide 17 releases the path of the wastewater from the sewer pipe 1 into the sewer pipe 2 ( Fig. 6 ).

[0035] In a preferred, in the Fig. 1 bis 7 In the embodiment shown, the device has a storage tank 15, which is separated from the pumping shaft 14 by a partition wall 18 and is connected to the pumping shaft 14 via an overflow 9. If, in the event of a backflow condition, the water level in the pumping shaft 14 is raised above the overflow 9, water from the pumping shaft 14 enters the storage tank 15. A system pump 13 is arranged in the storage tank 15, with which the water present in the storage tank 15 can be conveyed back into the pumping shaft 14 via a pressure pipe 16. Since the backflow condition of the device only occurs once or twice a year in typical buildings, it can happen in devices known from the prior art that the slide valves 17 or the adjusting elements, which are intended to prevent a backflow of wastewater from the sewer water 2 into the sewer pipe 1, are no longer functional due to infrequent operation and therefore fail. To avoid this, the Fig. 1 bis 7 In the preferred optional embodiment shown, the water in the storage tank 15 is conveyed into the pump shaft 14 via the system pump 13 and the pressure pipe 16 at regular intervals, for example once a week, and the water level in the pump shaft 14 is thus raised. When the water level is raised during maintenance operation, the float 7 is then raised, as previously described, and the slide 17 is thereby actuated ( Fig. 7 ). This makes it easy to carry out maintenance on a regular basis and ensure the functionality of the individual elements of the device. If the slide valve 17 is closed during maintenance operation, the level in the wastewater pipe 1 rises above the overflow edge or the overflow element 4 and wastewater enters the pump shaft 14. If the water level in the pump shaft 14 is raised further, it is raised above the overflow 9 and the storage tank 15 is filled again and the drain pump 11 is then activated by the water level probe 21 or the control unit 24 and the water level in the pump shaft 14 is lowered so that the float 7 or the slide valve 17 is returned to its normal state.

[0036] By arranging the storage tank 15 with the system pump 13, maintenance operations can be easily performed, and the functionality or malfunctions of individual elements of the device can be prevented or indicated particularly effectively. For example, the control unit 24 can detect whether a backflow condition or maintenance operation is in progress, for example, if the water level probe 21 indicates a rising water level in the pump shaft 14, but the probe 5 indicates no backflow in the wastewater pipe 1 or the sewer pipe 2.

[0037] In the Fig. 1 bis 7 In a preferred embodiment of the device according to the invention, the control unit 24 is connected to the drain pump 11 and the system pump 13 and controls them depending on the operating state. The control unit 24 is also connected to the water level probe 21 and the probe 5, with their state and their measured values being fed to the control unit 24. Depending on the operating state, i.e., the normal state or the backflow state, the drain pump 11 and / or the system pump 13 are actuated by the control unit 24.

[0038] In an optional embodiment, the control unit 24 is provided with a communication device by which the state of the device—i.e., whether it is in the normal state or in the backflow state—is transmitted, for example, to building maintenance or a maintenance service. Furthermore, it can be provided, for example, that the control unit 24 comprises a GSM module, thus transmitting a warning SMS or warning message when the backflow state occurs or individual elements fail in the maintenance state. Advantageously, the control unit 24 or the communication device can comprise a rechargeable battery to enable easy transmission of messages in the event of a power outage.

[0039] In an optional embodiment, it is provided that the pumping shaft 14 is dimensioned such that, for example, the wastewater that arises from the building during the backflow state, e.g. in several hours, can be stored in the pumping shaft 14 without it overflowing, even if the drain pump 11 cannot be activated, for example in the event of a power failure.

[0040] As in the Fig. 1 bis 7 As shown, it can optionally be provided that the pump line 12 is led beyond the backflow level of the sewer pipe 2 or the public sewer and in this way the backflow of water present in the sewer or the sewer pipe 2 is ensured even in the event of failure of the check valve 8.

[0041] Optionally, it can further be provided that the pressure pipe 16 has a flushing device, for example flushing nozzles 25, which open into the pump line 12, for example above the check valves 8, 10 and thus enable flushing of individual parts of the device such as the pump shaft 14, the drain pump 11, its suction area or in the area of the water level probe 21, the probe 5 or the check valves 8, 10.

[0042] As in the Fig. 1 bis 7 As shown, the device can preferably be designed as a shaft 3, which is installed as a prefabricated element, for example in buildings or houses or in the maintenance area of the objects or buildings, in one piece. For this purpose, the shaft 3 can, for example, be covered with a flat cover 22, in which one or more covers 23 are arranged. For example, the covers 23 can be removed and Fig. 1 bis 7 The ladder 20 shown ensures access to the individual elements of the device for maintenance or repair work.

[0043] As in the Fig. 1 bis 7 As shown, a so-called immersion apron 19 can optionally be provided in the pump shaft 14, which prevents solids from entering the storage tank 15 via the overflow 9.

[0044] As in Fig. 2 As shown, the drain pump 11 and its pump line 12 as well as the check valves 8, 10 can optionally be designed in duplicate, i.e. two or more drain pumps 11 can be arranged in the pump shaft 14 in order to be able to easily ensure the continued operation of the device in the event of the failure of one drain pump 11 or in the event of a very high wastewater volume or a rising water level in the pump shaft 14. As shown in Fig. 2 As shown, for example, the drain pump 11 and the pump line 12 can be arranged mirrored around the wastewater pipe 1.

[0045] In a preferred embodiment, the overflow element 4 or the overflow edge can be designed to be variable, so that the height of the wastewater present in the wastewater pipe 1 can be predetermined or changed, at which the water from the wastewater pipe 1 enters the pump shaft 14.

Claims

1. Device for preventing a backflow of water from a sewer in a building, comprising a pump shaft (14), a sewer pipe (2) and a wastewater pipe (1), which opens into the sewer pipe (2) and can thus convey wastewater in a building into the sewer, wherein the wastewater pipe (1) has an overflow element (4), from which water can flow out of the wastewater pipe (1) into the underlying pump shaft (14), wherein the overflow element (4) is arranged and designed such that, in a normal state, wastewater in the wastewater pipe (1) can flow unhindered to the sewer pipe (2) and, in a backflow state, water coming from the sewer pipe (2) into the wastewater pipe (1) flows into the pump shaft (14) via the overflow element (4), characterized in that a float (7) is arranged in the pump shaft (14), the position of which can be adjusted depending on the height of the water level in the pump shaft (14), wherein the float (7) is connected in a force-transmitting manner to a gate valve (17), in particular a knife gate valve, such that, when the water in the pump shaft (14) rises above a predefined threshold level, the gate valve (17) can be inserted in the flow path of the wastewater in the wastewater pipe (1) and the flow of water into and / or out of the sewer pipe (2) can be interrupted.

2. Device according to claim 1, characterized in that the float (7) is an, in particular air-filled, plastic container, which has a shape and / or a volume whereby a force of 1000 N to 4000 N, in particular 1500 N to 3500 N, can be exerted on the gate valve (17), such that any solids present in the wastewater pipe (1) can be broken up by the gate valve (17), and / or in that the gate valve (17) is designed as a stainless steel gate valve plate, the edge of which facing the wastewater pipe (1) is designed as a blade.

3. Device according to any one of the preceding claims, characterized in that a drain pump (11) with a pump line (12) connected to the drain pump (11) is arranged in the pump shaft (14), wherein the pump line (12) opens into the wastewater pipe (1) downstream of the gate valve (17) in the flow direction of the wastewater in the wastewater pipe (1), in particular tangentially via an expansion shaft (6), wherein the drain pump (11) can be controlled, in particular, via a water level sensor (21) arranged in the pump shaft (14), in particular preferably a float switch.

4. Device according to claim 3, characterized in that a number of check valves (8), in particular two check valves (8, 10), are arranged in the pump line (12) to prevent a backflow of wastewater into the pump line (12).

5. Device according to any one of the preceding claims, characterized in that the pump shaft (14) is dimensioned as a buffer such that, in a backflow state, in the case of the flow of wastewater into the sewer pipe (2) being shut-off by the gate valve (17), wastewater from the wastewater pipe (1) can enter the pump shaft (14) via the overflow element (4) and be collected and stored in the pump shaft (14).

6. Device according to any one of the preceding claims, characterized in that a sensor (5) is arranged in the wastewater pipe (1) in the flow direction of the wastewater downstream of the gate valve (17), with which the backflow state can be detected.

7. Device according to any one of the preceding claims, characterized in that the device has a storage tank (15), wherein the storage tank (15) is connected to the pump shaft (14) via an overflow (9), wherein a system pump (13) is arranged in the storage tank (15), with which water can be conveyed from the storage tank (15) via a pressure pipe (16) into the pump shaft (14).

8. Device according to claim 7, and dependent on claim 3, characterized in that the overflow (9) is arranged below the water level of the water level sensor (21), at which the drain pump (11) is switched on.

9. Device according to any one of claims 7 or 8, characterized in that the pressure pipe (16) has a flushing device, in particular flushing nozzles (25), in order to flush out any solids from individual parts of the device, in particular the pump shaft (14), the drain pump (11), the intake area of the drain pump, the water level sensor (21), the sensor (5) and / or the check valves (8, 10).

10. Device according to any one of claims 3 to 9, characterized in that the pump line (12) runs above the backflow level of the sewer pipe (2).

11. Device according to any one of claims 6 to 10, and dependent on claim 3 and on claim 7, characterized in that the device has a control unit (24), which is connected to the water level sensor (21) and the sensor (5) via electrical wires, wherein the control unit (24) is fed the state of the water level sensor (21) and the sensor (5), wherein the control unit (24) is connected to the drain pump (11) and the system pump (13), wherein the drain pump (11) and the system pump (13) can be controlled via the control unit (24).

12. Device according to claim 11, characterized in that the control unit (24) is designed such that the system pump (13) can be switched into a maintenance state at predefined time intervals, in particular once a week, wherein, in the maintenance state, the water present in the storage tank (15) can be conveyed into the pump shaft (14) and such that the float (7) in the pump shaft (14) can be raised and the gate valve (17) inserted into the wastewater pipe (1).

13. Device according to any one of the preceding claims, characterized in that the device, in particular the control unit (24), has a communication device, with which a warning can be issued if a previously defined water level, in particular the backflow state, is present in the wastewater pipe (1), wherein the communication device preferably has an, in particular battery-operated, GSM module, with which a message can be transmitted if the backflow state is present.

14. Device according to any one of the preceding claims, characterized in that the height of the overflow element (4) is designed to be adjustable, such that the height of the water in the wastewater pipe (1) at which water enters the pump shaft (14) from the wastewater pipe (1) can be adjusted.

15. Device according to any one of the preceding claims, characterized in that the device is designed as a shaft (3) and has a number of caps (23) via which the individual elements of the device, in particular the pump shaft (14), the control unit (24), the drain pump (11), the system pump (13), the gate valve (17), the check valve (8) and / or storage tank (15), are accessible from the area around the device.

16. Device according to any one of claims 3 to 15, characterized in that a plurality of drain pumps (11), in particular two drain pumps (11), are arranged in the pump shaft (14), wherein each drain pump (11) has a pump line (12), wherein each pump line (12) opens into the wastewater pipe (1) downstream of the gate valve (17) in the flow direction of the wastewater in the wastewater pipe (1), in particular tangentially via an expansion shaft (6).

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