Aircraft hangar drainage system

Abstract

The utility model discloses a kind of apron cleaning mouth and aircraft hangar drainage system, it is related to aircraft hangar drainage field, to the problem that outdoor inspection well is set in front of storehouse apron is easily damaged by aircraft rolling, apron cleaning mouth is set in front of storehouse apron area, by wall pipe is embedded in front of storehouse apron, realize the force transmission of wall pipe and in front of storehouse apron, maintenance structure is hidden in apron, wall pipe top opening is flush with in front of storehouse apron top surface, utilize the strength of in front of storehouse apron itself disperses aircraft rolling load, reduce the pressure that directly acts on apron cleaning mouth, connecting pipe is fixed by flange and water following tee, other end is probed into wall pipe, drainage system adds water seal well and oil separation tank, maintenance waste water is sequentially into sewage collection tank after maintenance waste water ditch, apron drainage pipe, water seal well, oil separation tank, by setting water seal well, cut off the spreading path of fire along drainage pipeline.

Description

Technical Field

[0001] This utility model relates to the field of aircraft hangar drainage, and in particular to an apron cleaning inlet and an aircraft hangar drainage system. Background Technology

[0002] In the aircraft hangar drainage system, maintenance wastewater from inside the hangar is collected in a maintenance wastewater ditch and then discharged to the ground surface area. Due to the large distance between the hangar and the ground surface area, maintenance facilities need to be installed in the under-aperture drainage pipe between the hangar and the ground surface area. In general airports, outdoor inspection wells are usually installed to achieve this maintenance function.

[0003] However, traditional outdoor manholes are prone to damage from aircraft and require regular maintenance, which increases costs. Additionally, manhole covers installed in front of the hangar are unsightly. Furthermore, the wastewater from aircraft hangar maintenance contains oil, which can cause pollution if discharged directly into the ground area. In the event of a fire, the fire may enter the hangar through the drainage system, posing a safety hazard. Utility Model Content

[0004] The purpose of this utility model is to address the shortcomings of existing technologies by providing an apron cleaning port and aircraft hangar drainage system. An apron cleaning port is installed in the hangar front apron area, with a retaining pipe embedded within the hangar front apron to achieve force transfer between the retaining pipe and the hangar front apron. The maintenance structure is concealed beneath the apron. The top opening of the retaining pipe is flush with the top surface of the hangar front apron. The inherent strength of the hangar front apron is used to distribute the aircraft's crushing load, reducing the pressure directly acting on the apron cleaning port and improving its durability. The apron cleaning port is smaller and fewer in number than traditional outdoor manholes, improving aesthetics.

[0005] To achieve the above objectives, the following technical solution is adopted:

[0006] An apron cleaning inlet and hangar drainage system includes a maintenance wastewater ditch, an under-apron drainage pipe, a water seal well, an oil separator, and a sewage collection tank connected in sequence. The maintenance wastewater ditch is located in the hangar area. The under-apron drainage pipe passes through the hangar front apron located between the hangar and the ground area. The under-apron drainage pipe connects to the apron cleaning inlet within the hangar front apron area. The apron cleaning inlet includes a cleaning inlet connecting pipe, a tee fitting, and a retaining pipe. One end of the cleaning inlet connecting pipe is connected to the tee fitting via a flange, and the other end extends into and connects to the retaining pipe. The top opening of the retaining pipe serves as the cleaning inlet opening and is flush with the top surface of the hangar front apron. The tee fitting connects to the under-apron drainage pipe so that the cleaning inlet opening is connected to the under-apron drainage pipe.

[0007] As a further preferred embodiment, the water seal well, the oil separator, and the sewage collection tank are arranged in the soil surface area, and the water seal well and the oil separator, as well as the sewage collection tank, are connected by soil surface drainage pipes.

[0008] As a further preferred embodiment, the subsurface drainage pipe is provided in multiple sections, each of which is connected to a water seal well. The multiple water seal wells are connected to each other through a surface drainage pipe and then connected to an oil separator.

[0009] As a further preferred embodiment, a submersible sewage pump is arranged in the sewage collection tank, and the submersible sewage pump is connected to the rainwater drainage ditch of the site through a pressure discharge pipe.

[0010] As a further preferred embodiment, a check valve and a gate valve are installed on the discharge pipe, and the oil separator is connected to the sewage collection tank through the soil surface drainage pipe, which is located above the submersible pump.

[0011] As a further preferred embodiment, the under-floor drainage pipe is arranged at an angle, and the end of the maintenance wastewater ditch is connected to the under-floor drainage pipe through a drainage floor drain. The end of the under-floor drainage pipe connected to the drainage floor drain is higher than the end of the under-floor drainage pipe connected to the soil surface drainage pipe.

[0012] As a further preferred embodiment, the reservoir front pavement includes a reservoir front pavement surface layer and a reservoir front pavement base layer and a subbase layer located below the reservoir front pavement surface layer, with protective pads distributed around the cleaning port connecting pipe below the reservoir front pavement surface layer.

[0013] As a further preferred embodiment, the top of the protective tube extends radially away from the axis to form an annulus, and a cap is installed at the cleaning port.

[0014] As a further preferred embodiment, the three ports of the tee are each provided with a flange, and are connected to the drainage pipe under the platform through the flange.

[0015] As a further preferred embodiment, aircraft wheel tracks are provided on the deck in front of the warehouse.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] To address the issue of outdoor inspection wells being easily damaged by aircraft running over them on the apron, an apron cleaning port is installed in the apron area. A retaining pipe is embedded within the apron to transfer stress between the pipe and the apron, concealing the maintenance structure beneath the apron. The top opening of the retaining pipe is flush with the top surface of the apron, utilizing the apron's own strength to distribute the aircraft running load and reduce the pressure directly acting on the cleaning port. The connecting pipe is fixed to a water-cooled tee via a flange, with the other end extending into the retaining pipe. The drainage system includes a water-sealed well and an grease trap. Maintenance wastewater flows sequentially through a maintenance wastewater ditch, an under-apron drainage pipe, the water-sealed well, and the grease trap before entering a sewage collection tank. The water-sealed well prevents fire from spreading along the drainage pipes, while the grease trap uses gravity separation to trap oily substances in the wastewater, preventing pollution of the surface area and meeting environmental emission requirements. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the apron cleaning opening and the aircraft hangar drainage system in an embodiment of this utility model.

[0019] Figure 2 This is a schematic diagram of the structure of the apron cleaning port in an embodiment of this utility model.

[0020] Figure 3 This is a schematic diagram showing the distribution of maintenance wastewater ditches and underfloor drainage pipes in an embodiment of this utility model.

[0021] Figure 4 This is a schematic diagram showing the distribution of the oil separator and the sewage collection tank in an embodiment of this utility model.

[0022] Figure 5 This is a schematic diagram of a submersible pump installed in a sewage collection tank according to an embodiment of the present invention.

[0023] Numbering Explanation (in order of first appearance): 1. Aircraft hangar; 2. Ground surface area; 3. Hanger front apron; 31. Hanger front apron surface layer; 32. Hanger front apron base layer and subbase layer; 33. Aircraft wheel tracks; 4. Maintenance wastewater ditch; 5. Drainage floor drain; 6. Under-apron drainage pipe; 7. Apron cleaning port; 71. Cleaning port opening; 72. Protective wall pipe; 73. Cleaning port connecting pipe; 74. Flange; 75. Water-following tee; 76. Gasket; 8. Water seal well; 9. Ground surface drainage pipe; 10. Oil separator; 101. Partition plate; 11. Sewage collection tank; 12. Submersible sewage pump; 13. Check valve; 14. Gate valve; 15. Pressure discharge pipe; 16. Area rainwater drainage ditch. Detailed Implementation

[0024] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings.

[0025] Traditional outdoor inspection manholes are located on the hangar front apron 3. Frequent aircraft traffic can easily damage the manhole covers and structures, requiring regular maintenance and replacement, which increases maintenance costs. The apron in front of hangar 1 is the main area for aircraft takeoff, landing, and taxiing, with heavy loads. Traditional manhole covers protrude or are recessed on the surface of the hangar front apron 3, which does not meet the requirements for the overall flatness and aesthetics of the apron and affects the visual effect of the airport environment.

[0026] In this regard, such as Figures 1-5As shown, this embodiment provides an apron cleaning port and hangar drainage system, including a maintenance wastewater ditch 4, an under-apron drainage pipe 6, a water seal well 8, an oil separator 10, and a sewage collection tank 11 connected in sequence. The maintenance wastewater ditch 4 is located in the hangar 1 area. The under-apron drainage pipe 6 passes through the hangar front apron 3 located between the hangar 1 and the ground area 2. The under-apron drainage pipe 6 connects to the apron cleaning port 7 within the hangar front apron 3. The apron cleaning port 7 includes a cleaning port connecting pipe 73, a tee 75, and a retaining pipe 72. One end of the cleaning port connecting pipe 73 is connected to the tee 75 through a flange 74, and the other end extends into and connects to the retaining pipe 72. The top opening of the retaining pipe 72 serves as the cleaning port opening 71 and is flush with the top surface of the hangar front apron 3. The tee 75 connects to the under-apron drainage pipe 6 so that the cleaning port opening 71 connects to the under-apron drainage pipe 6.

[0027] The cleaning port connecting pipe 73 connects to the water-following tee 75 via flange 74, serving as a maintenance access channel. It can be made of high-strength, pressure-resistant materials, such as ductile iron, to withstand apron loads. The water-following tee 75 connects to the under-apron drainage pipe 6, optimizing water flow direction, reducing local resistance, and providing a connection interface for the cleaning port. The top opening of the retaining pipe 72 is flush with the top surface of the apron 3 in front of the hangar, forming a concealed cleaning port to prevent direct impact on the interface when aircraft run over it, while also ensuring a flat apron surface.

[0028] The traditional exposed inspection well is replaced with an embedded apron cleaning port 7, and the top of the protective pipe 72 is flush with the apron surface, so that the apron load is borne by the apron surface structure instead of being directly applied to the cleaning port, reducing the risk of damage; the concealed structure improves the aesthetics.

[0029] In this embodiment, the water-sealed well 8 utilizes the water-sealing principle to block flammable gases or flames in the drainage pipe, preventing the fire from spreading to the aircraft hangar 1 through the pipe. The grease trap 10 uses gravity separation to trap oil in the wastewater. A baffle 101 is installed in the grease trap 10 to treat the oily wastewater before discharge, reducing environmental pollution. In this embodiment, both the water-sealed well 8 and the grease trap 10 can use existing structures.

[0030] Water seal well 8 and oil separator 10 are added to the drainage path to cut off the fire spread path and oil pollution discharge path from the perspectives of safety isolation and pollution control, respectively, so as to achieve the dual goals of safety and environmental protection.

[0031] The concealed structure of the apron cleaning port 7 enhances the resistance of maintenance facilities to crushing, reducing the frequency of maintenance due to damage. The flange 74 connection design facilitates quick disassembly and maintenance, shortening maintenance time and improving airport operational efficiency. The flush design of the wall-mounted pipe 72 with the top surface of the hangar apron 3 ensures a smooth and uniform apron surface, meeting airport landscape design requirements and enhancing the overall image of the airport.

[0032] The grease trap 10 intercepts oil sludge, effectively reducing soil and water pollution and meeting environmental emission requirements. The water seal well 8 can withstand the impact of flames under certain pressure, preventing the spread of fire and improving the fire safety level of the aircraft hangar 1. The layout of the water tee 75 and the cleaning port makes the discharge of maintenance wastewater smoother, and at the same time facilitates the dredging and unblocking of the drainage pipe 6 under the apron, ensuring the long-term stable operation of the drainage system.

[0033] The water seal well 8, oil separator 10 and sewage collection tank 11 are arranged in the soil area 2, avoiding the placement of treatment facilities in aircraft activity areas such as the apron 3 in front of the warehouse. This solves the risk of the treatment facilities being damaged by aircraft in the traditional solution, while freeing up space in the apron 3 for aircraft operation.

[0034] The water seal well 8 is connected to the oil separator 10, and the oil separator 10 is connected to the sewage collection tank 11 via a surface drainage pipe 9. The soil in the surface area 2 protects the pipes, reducing the impact of external loads. The surface drainage pipe 9 is buried beneath the surface area 2; its burial depth and material can be designed according to the load requirements of the surface area 2. HDPE pipes can be used for the surface drainage pipe 9 to reduce the risk of pipe rupture. The treatment facilities are centrally located in the non-apron area, ensuring that maintenance work does not affect normal aircraft operation.

[0035] A single drainage pipe failure can paralyze the entire drainage system, and large volumes of wastewater are prone to drainage problems. Multiple underground drainage pipes 6 are connected to water seal wells 8, and these wells 8 are interconnected. Each underground drainage pipe 6 is independently connected to a water seal well 8, forming a parallel drainage network. When one underground drainage pipe 6 is blocked, the other pipes can continue to operate. Multiple water seal wells 8 are interconnected via surface drainage pipes 9 and then connected to an grease trap 10 to balance the drainage volume in different areas and prevent localized water accumulation. This redundant design of the drainage system improves reliability, facilitates zoned maintenance, and reduces the area of ​​partial closure on the apron.

[0036] The elevation of the soil surface area 2 may be higher than the site's stormwater drainage ditch 16, preventing wastewater from flowing out by gravity and necessitating pumping for discharge; simultaneously, backflow prevention is required. A submersible sewage pump 12 is installed in the water collection tank. The pump 12 is connected to the site's stormwater drainage ditch 16 via a pressure discharge pipe 15. The pump 12 is selected based on the wastewater flow rate and head to ensure that wastewater in the sewage collection tank 11 is pumped to the site's stormwater drainage ditch 16. The pressure discharge pipe 15 connects to the site's stormwater drainage ditch 16, achieving final discharge of the wastewater. This solves the drainage problem caused by the elevation difference, achieves active wastewater discharge, and ensures no water accumulation in the system.

[0037] A check valve 13 and a gate valve 14 are installed on the discharge pipe. The grease trap 10 is connected to the sewage collection tank 11 via the surface drainage pipe 9, located above the submersible pump 12, to prevent water from the site's rainwater drainage ditch 16 from flowing back into the sewage collection tank 11 and affecting system operation; it also facilitates control of pipe flow. The check valve 13 on the discharge pipe automatically closes using water pressure to prevent reverse flow. The gate valve 14 is used to shut off the pipe during maintenance, facilitating the maintenance of the submersible pump 12. The grease trap 10 is connected to the sewage collection tank 11 above the submersible pump 12 to prevent wastewater from submerging the pump body and affecting equipment operation.

[0038] The drainage pipe 6 under the platform is arranged at an angle. The end of the maintenance wastewater ditch 4 is connected to the drainage pipe 6 under the platform through the drainage floor drain 5. The end of the drainage pipe 6 under the platform that connects to the drainage floor drain 5 is higher than the end of the drainage pipe 6 under the platform that connects to the surface drainage pipe 9, to ensure that the maintenance wastewater flows smoothly and to avoid water accumulation in the pipe, which can lead to oil deposits and pipe blockage.

[0039] The drainage pipe 6 is laid at a certain slope, not less than 0.01. The connection end of the drainage floor drain 5 is higher than the connection end of the drainage pipe 9 on the soil surface, forming gravity flow. The end of the maintenance wastewater ditch 4 is connected to the drainage pipe 6 through the drainage floor drain 5, using the filtering function of the floor drain to reduce large particulate impurities from entering the pipe.

[0040] The apron 3 includes an apron surface layer 31 and a base layer and subbase layer 32 located below the surface layer 31. Protective pads 76 are distributed around the cleaning port connecting pipe 73 below the apron surface layer 31 to prevent the load of the apron 3 from directly acting on the cleaning port connecting pipe 73, thus avoiding pipe deformation and breakage. The protective pads 76 laid around the cleaning port connecting pipe 73 below the apron surface layer 31 buffer the apron load. In this embodiment, the protective pads 76 are made of C20 fine aggregate concrete, compacted in layers. The protective pads 76 can absorb the stress of the apron load, control the deformation of the connecting pipe, and extend the service life of the pipe.

[0041] The top of the retaining pipe 72 extends radially away from the axis to form a ring. A cap is installed at the cleaning opening 71 to enhance its structural strength, prevent damage from aircraft impacts, and prevent debris from falling into the pipe. The radial extension of the top of the retaining pipe 72 forms a ring structure, increasing the contact area with the front deck surface 31 and distributing the load. The cleaning opening 71 is capped; the cap material can be stainless steel, and its top surface is flush with the top surface of the front deck 3 to ensure a flat surface and prevent foreign objects from entering. The retaining pipe 72 can also be made of stainless steel.

[0042] The three ports of the Shunshui tee 75 are each equipped with a flange 74, which connects to the underfloor drainage pipe 6, facilitating pipe installation and maintenance, and improving the sealing and reliability of the connection. All three ports of the Shunshui tee 75 are connected using flanges 74, secured with bolts and fitted with sealing gaskets. It offers high sealing performance and allows for quick disassembly during maintenance.

[0043] The apron 3 is equipped with aircraft wheel tracks 33 to guide aircraft on their course and prevent them from running over cleaning openings and other facilities. Clear wheel tracks are marked on the surface of the apron 3 according to aircraft wheelbase standards to indicate aircraft taxiing paths. Guided by these wheel tracks, the probability of aircraft running over cleaning openings can be reduced by 90%, further protecting the safety of apron facilities.

[0044] The slope of the maintenance wastewater ditch 4 towards the drainage floor drain 5 is 0.005, and the net width is 0.4m; the drainage floor drain 5 is DN50; the slope of the under-floor drainage pipe 6 towards the water seal well 8 is 0.01, and the pipe diameter is DN150; the submersible sewage pump 12 is installed inside the sewage collection tank 11, model JYWQ80-40-9-1600-3, and adopts a dual-pump fixed self-coupling installation, one in use and one on standby, discharging water through the pressure discharge pipe 15 to the site's rainwater drainage ditch 16. The gate valve 14 is made of ductile iron and is a direct-buried soft-seal gate valve 14. The pressure discharge pipe 15 is made of PE pipe with a diameter of DN50.

[0045] The specific embodiments of the utility model have been described in detail above, but they are only examples, and the utility model is not limited to the specific embodiments described above. For those skilled in the art, any equivalent modifications or substitutions to the utility model are also within the scope of the utility model. Therefore, all equivalent transformations, modifications, and improvements made without departing from the spirit and principles of the utility model should be covered within the scope of the utility model.

Claims

1. A pavement cleaning inlet and aircraft hangar drainage system, characterized in that, The system includes a maintenance wastewater ditch, an under-drainage pipe, a water seal well, an oil separator, and a sewage collection tank, all connected in sequence. The maintenance wastewater ditch is located in the aircraft hangar area. The under-drainage pipe passes through the hangar front apron located between the aircraft hangar and the ground area. Within the hangar front apron area, the under-drainage pipe connects to the apron cleaning inlet. The apron cleaning inlet includes a cleaning inlet connecting pipe, a tee, and a retaining pipe. One end of the cleaning inlet connecting pipe is connected to the tee via a flange, and the other end extends into and connects to the retaining pipe. The top opening of the retaining pipe serves as the cleaning inlet opening and is flush with the top surface of the hangar front apron. The tee connects to the under-drainage pipe so that the cleaning inlet opening is connected to the under-drainage pipe.

2. The apron cleaning inlet and aircraft hangar drainage system as described in claim 1, characterized in that, The water seal well, oil separator, and sewage collection tank are arranged in the soil surface area. The water seal well and the oil separator, as well as the oil separator and the sewage collection tank, are connected by soil surface drainage pipes.

3. The apron cleaning inlet and aircraft hangar drainage system as described in claim 2, characterized in that, The underground drainage pipes are provided in multiple locations, each of which is connected to a water seal well. The multiple water seal wells are connected to each other through earthen surface drainage pipes and then connected to an oil separator.

4. The apron cleaning inlet and aircraft hangar drainage system as described in claim 1, 2, or 3, characterized in that, The sewage collection tank is equipped with a submersible sewage pump, which is connected to the site's rainwater drainage ditch via a pressure discharge pipe.

5. The apron cleaning inlet and aircraft hangar drainage system as described in claim 4, characterized in that, The discharge pipe is equipped with a check valve and a gate valve. The oil separator is connected to the sewage collection tank through the soil surface drainage pipe, which is located above the submersible pump.

6. The apron cleaning inlet and aircraft hangar drainage system as described in claim 1, characterized in that, The drainage pipe under the platform is arranged at an angle. The end of the maintenance wastewater ditch is connected to the drainage pipe under the platform through a drainage floor drain. The end of the drainage pipe under the platform that connects to the drainage floor drain is higher than the end of the drainage pipe under the platform that connects to the drainage pipe on the ground surface.

7. The apron cleaning inlet and aircraft hangar drainage system as described in claim 1, characterized in that, The reservoir front pavement includes a reservoir front pavement surface layer and a reservoir front pavement base layer and a subbase layer located below the reservoir front pavement surface layer. A protective pad is distributed around the cleaning port connecting pipe below the reservoir front pavement surface layer.

8. The apron cleaning inlet and aircraft hangar drainage system as described in claim 7, characterized in that, The top of the protective tube extends radially away from the axis to form a ring, and a cap is installed at the cleaning port.

9. The apron cleaning inlet and aircraft hangar drainage system as described in claim 1, characterized in that, The three ports of the tee are each equipped with a flange, and are connected to the drainage pipe under the platform through the flange.

10. The apron cleaning inlet and aircraft hangar drainage system as described in claim 1, characterized in that, Aircraft wheel tracks are located on the plaza in front of the warehouse.

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