Ecological design structure of ecological wetland park

Abstract

The invention relates to an ecological design structure of an ecological wetland park, and belongs to the technical field of ecological environment design, a filter tank is arranged in an upstream water level area of the wetland park, a plurality of filter screens are arranged in the filter tank, and the filter screens can intensively intercept part of garbage in sewage; the filter tank is directly communicated with a gathering area on the bank side of the wetland, and a protective net formed by interweaving fine steel wires covers the slope surface of the slope on the arc side of the filter tank; aquatic plants are further planted in the gathering area, the aquatic plants are planted on planting plates in the gathering area, and the planting plates float on the water surface in a floating mode; the gathering area is located at the highest water level in the whole wetland park, a water accumulation pool is arranged at the lowest water level of the wetland park, a water supply pipeline is installed in the water accumulation pool, and the water supply pipeline is communicated with a greening irrigation pipe network in the wetland park. According to the invention, self operation of the wetland park and water source purification can be well integrated, and a fast, efficient and sustainable environment-friendly ecological system is created.

Description

Technical Field

[0001] The present invention relates to the technical field of ecological environment design, and in particular to an ecological design structure of an ecological wetland park. Background Art

[0002] As an important part of the urban ecosystem, wetland parks not only provide space for leisure and entertainment, but also effectively treat sewage and improve water quality, which is of great significance to the sustainable development of the city. Wetland sewage treatment is a natural ecological treatment method that uses the natural filtering ability of wetlands themselves, as well as the plants and microorganisms that grow in wetlands themselves, to purify water bodies. This method is widely used around the world due to its low cost, easy maintenance, and strong sustainability.

[0003] The current technology of wetland sewage purification is very mature, but there are also some problems. First, the design and integration of wetlands are not ideal, and the combination of natural wetlands and artificial wetlands is not sufficient, which makes the natural purification capacity of sewage not high enough. In particular, a large amount of sewage is not well designed at the entrance of the wetland park, resulting in a large amount of garbage scattered and silted, which requires a lot of manpower to salvage and remove. Second, the wetland bank is impacted by water all year round, causing landslides and collapses in the wetland bank slopes, and a large amount of wetland soil is lost to the sewage inlet area. After the soil in the entrance area is silted up, the sewage directly overflows from the wetland surface, seriously affecting the filtering and purification effect of the wetland soil on sewage. In addition, when purifying sewage, the existing wetland park mainly relies on the natural infiltration of sewage through the wetland bank, or at the edge of the wetland. Relatively speaking, it relies on the natural flow of water, resulting in the accumulation of a large amount of pollutants in the sewage after long-term filtration of sewage in the soil of the bank. The remaining areas still have a large sewage accommodation and disposal capacity because the water flow is more dispersed and the flow rate gradually decreases, resulting in a serious lack of wetland utilization. In addition, due to the different wetland structures, the overall structure is not uniform. Therefore, this natural reliance on water infiltration through the wetland's absorbent layer further leads to the underutilization of the wetland's purification capacity.

[0004] In summary, although the application of wetland technology in sewage treatment has become relatively mature, including the corresponding treatment relationship between sewage types and landscape green plants, wetland ecological green plant planting technology, etc., there are still some technical bottlenecks. Improvements are needed in the layout design of the entire wetland park to enhance the purification effect and create a more sustainable and complete ecological chain. Summary of the invention

[0005] In view of this, the purpose of the present invention is to provide an ecological design structure of an ecological wetland park to solve the problem in the prior art that the purification effect is not sufficient when using wetland parks to treat sewage.

[0006] The present invention is achieved through the following technical solutions:

[0007] An ecological design structure of an ecological wetland park, including connecting an urban drainage network to a wetland park so that sewage is naturally purified when flowing through the wetland park, and setting a filter pool in the upstream water level area of ​​the wetland park, through which sewage enters the wetland, and a plurality of filter screens are arranged in the filter pool, which can concentrate and intercept part of the garbage in the sewage; the filter pool is directly connected to a gathering area on the bank of the wetland, and the gathering area is semicircular, and its arc edge is the position of the slope surface of the wetland, and the slope surface It is covered with a protective net woven with fine steel wires, which can prevent the slope from collapsing due to the infiltration of sewage; aquatic plants that can decompose and absorb some organic matter in sewage are also planted in the gathering area, and the aquatic plants are planted on the planting boards in the gathering area, and the planting boards float on the water surface in a floating manner; the gathering area is at the highest water level in the entire wetland park, and a water storage pool is provided at the lowest water level of the wetland park, and a water supply pipe is installed in the water storage pool, and the water supply pipe is connected to the greening irrigation pipe network inside the wetland park.

[0008] Furthermore, the filtration tank is also connected to a backup oxidation tank, which initially oxidizes the sewage and then outputs it to a backup nitrification reaction tank. The backup nitrification reaction tank is connected to the gathering area to further discharge the initially purified sewage into the wetland.

[0009] Furthermore, an arc-shaped water retaining dam is provided along the direction in which the slope surface extends on the periphery of the slope, and a plurality of water culverts are provided on the water retaining dam. A water distribution pool is formed between the water retaining dam and the slope surface. A plurality of water distribution pipes are provided from top to bottom in the water distribution pool. A control valve is provided on the water distribution pipe. The outlet end of the water distribution pipe is inserted into the wetland, and a plurality of water distribution holes are provided along the axial direction of the water distribution pipe. All the water distribution holes are located on the lower half of the pipe wall of the water distribution pipe, and the aperture of each water distribution hole gradually increases along the direction of water flow.

[0010] Furthermore, a first purification area, a transfer pool, a second purification area, and the water storage pool are sequentially arranged along the direction of water flow in the wetland, wherein the transfer pool and the water storage pool are hollow structures, and the internal space is used for storing water, and the first purification area and the second purification area are wetland entities.

[0011] Furthermore, the first purification zone and the second purification zone each include, from top to bottom, purification plants, an upper filter contact purification filler and a lower filter contact purification filler, and particles of the upper filter contact purification filler are smaller than those of the lower filter contact purification filler.

[0012] Furthermore, the depth of the transfer tank is consistent with the bottom depth of the lower filter contact purification filler, and the transfer tank is connected to the two purification areas by the water distribution pipes installed at different depths, so that the water in the first purification area flows into the transfer tank, is purified again in the second purification area, and then flows into the water storage tank.

[0013] Furthermore, an overflow wall is provided on the side of the transfer pool close to the first purification area, the bottom end of the overflow wall starts from the bottom of the transfer pool, and the top end is lower than the pool mouth of the transfer pool, so that the water flowing into the first purification area overflows from the top of the overflow wall and enters the right side space of the transfer pool, and floating leaf landscape green plants floating on the water surface are also planted in the pool water of the transfer pool, and the floating leaf landscape green plants can decompose some of the remaining organic matter in the transfer pool again.

[0014] Furthermore, a gas pipeline is provided in the transfer pool, and the gas pipeline is densely distributed in the floating leaf landscape green plants. The pipe sections of the gas pipeline located in the floating leaf landscape green plants are arranged with a number of air inlets, and the pipe sections of the gas pipeline located in the purification plant clusters in the purification area are provided with a number of air outlets, and an air pump is installed to transport part of the gas generated in the transfer pool to the purification plants for their growth needs.

[0015] Furthermore, a sludge discharge pipe is provided, one end of which is located at the bottom of the filter tank, and the other end is connected to a sewage pump located in a ground machine room, and the sewage pump can suck out the silt accumulated at the bottom of the filter tank.

[0016] Furthermore, the outlet end of the blood stasis discharge pipe is located in the standby oxidation tank, and the valve between the standby oxidation tank and the standby nitrification reaction tank is opened when the blood stasis discharge pipe is opened.

[0017] The beneficial effects of the present invention are:

[0018] The ecological design structure of the ecological wetland park is to discharge sewage to the entrance of the high terrain of the wetland park, filter and purify it in advance, then discharge it into the gathering area for preliminary decomposition by aquatic plants, and then enter a fan-shaped water distribution pool, gradually penetrate into the wetland through the shore with a large contact surface, and then when flowing through various areas in the wetland, the water is gradually purified naturally through the treatment of soil, corresponding landscape plants, etc., and finally obtain clean water sources to form natural lakes, and part of it is directly connected to the irrigation network in the wetland park for the maintenance of green plants in the park, and the corresponding silt can be used as green plant fertilizer or planting and growth matrix, to create a sustainable and complete ecological circulation system, greatly improving the sewage purification capacity, and the present invention also proposes that the water is actively drained to a certain area through different depths, corresponding to different flow rates, according to the soil distribution at different wetland depths, which not only takes into account the uniformity of sewage flowing to the entire plane area of ​​the wetland park, but also takes into account the adaptation of water treatment capacity at depth, thereby making the ecological wetland park have more sufficient sewage purification capacity.

[0019] Other advantages, objectives and features of the present invention will be described in the following description to some extent, and to some extent, will be obvious to those skilled in the art based on the following examination and study, or can be taught from the practice of the present invention. The objectives and other advantages of the present invention can be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A plan layout diagram of the present invention;

[0021] Figure 2 for Figure 1 AA section view in;

[0022] Figure 3 This is a schematic diagram of the local structure of the water distribution pipe.

[0023] In the figure: filter tank 1, gathering area 2, slope surface 3, retaining dam 4, water distribution pool 5, water accumulation pool 6, first purification area 7, transfer pool 8, second purification area 9, masonry 10, water distribution pipe 11, overflow wall 12, purification plants 13, landscape green plants 14, gas pipeline 15, water distribution hole 16, upper filter contact purification filler 17, lower filter contact purification filler 18. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0025] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0027] See also Figure 1-2 The present invention provides a technical solution: an ecological design structure of an ecological wetland park, which mainly includes connecting the urban drainage network to the wetland park so that the sewage can be naturally purified when flowing through the wetland park. The drainage network can be a sewer network or a sewage network that has been preliminarily treated by some specific surrounding factories. Specifically, a filter pool 1 can be set in the upstream water level area of ​​the wetland park, and the sewage from the network enters the wetland through the filter pool 1. Moreover, a number of filter nets are provided in the filter pool 1. The filter nets can concentrate and intercept part of the garbage in the sewage to avoid some large garbage from pouring into the wetland and causing excessive siltation, resulting in the flooding of the wetland and affecting the self-purification ability of the wetland. In addition, in this embodiment, if Figure 1 , its filter pool 1 is directly connected to a gathering area 2 on the wetland shore. The gathering area 2 is semicircular and can be excavated artificially, or expanded or renovated based on the original terrain. The arc edge of this gathering area 2 is the location of a slope surface 3 of the wetland to expand the contact surface with sewage, and the slope surface 3 is covered with a protective net made of fine steel wires. These protective nets can prevent the slope from collapsing due to the infiltration of sewage. At the same time, when sewage and garbage cover the wetland shore, the protective net can be uncovered to centrally clean up the garbage covering the shore to avoid affecting the hydrophobicity of the wetland and affecting the wetland's natural purification and treatment capacity for sewage. Finally, in practice, it is also necessary to plant aquatic plants that can decompose and absorb some organic matter in sewage in the gathering area mentioned above. The specific types are selected according to the adaptability of the local sewage types. In specific implementation, these aquatic plants are planted on several planting boards in the gathering area. The planting boards float on the water surface in a floating manner so that a variety of purification plants can be planted in the water, which is easy to manage and maintain.

[0028] As one of the embodiments, this gathering area is at the highest water level in the entire wetland park, and a water storage pool 6 is provided at the lowest water level in the wetland park, so that sewage can be gradually purified naturally as it flows through the wetland from top to bottom. Water supply pipes are installed in the water storage pool 6, and these water supply pipes are connected to the greening irrigation network inside the wetland park. The water purified by the wetland itself is used on-site for plant maintenance in the wetland park, which is environmentally friendly and efficient, and realizes the recycling of water resources.

[0029] As one of the implementation options, the filtration tank 1 can be connected to a backup oxidation tank. After the sewage is initially oxidized by the backup oxidation tank, it is output to a backup nitrification reaction tank. The backup nitrification reaction tank is connected to the gathering area 2 to further discharge the sewage that has been initially purified by oxidation and nitrification decomposition into the wetland. This is mainly for the treatment of sewage with relatively serious pollution indicators entering the park, avoiding complete reliance on natural purification in the wetland park.

[0030] In this embodiment: Figure 1 As shown, an arc-shaped water retaining dam 4 is provided on the periphery of the slope along the direction in which the slope extends. The water retaining dam 4 can prevent a large amount of sewage from flowing into the wetland bank, thereby avoiding frequent and large impacts on the wetland and causing landslides. Correspondingly, there are also a number of water culverts on the water retaining dam 4 so as to further discharge the water preliminarily purified by the corresponding aquatic plants into a water distribution pool 5. In specific practice, the fan-shaped area enclosed by the water retaining dam 4 and the slope surface 3 is a water distribution pool 5. A number of water distribution pipes 11 are arranged from top to bottom in the water distribution pool 5. The water distribution pipes 11 are provided with control valves to control the amount of water distribution, and the outlet ends of the water distribution pipes 11 are inserted into the wetland to actively drain water to a greater depth inside the wetland. It not only relies on the gradual infiltration of sewage from the wetland shore to improve the purification capacity, but also makes full use of the self-purification capacity of the wetland to allow water to flow directly into the wetland except for the shore area as much as possible for subsequent purification treatment. Moreover, the water distribution pipe 11 is provided with a number of water distribution holes 16 along the axial direction of the pipeline to gradually distribute water along the pipeline, and as Figure 3 All water distribution holes 16 are located on the lower half of the pipe wall of the water distribution pipe 11 to prevent the upper wetland soil from falling into the pipe due to its own weight and causing blockage. In addition, during construction, the aperture of each water distribution hole 16 is gradually increased along the direction of water flow, that is, from high to low terrain, because the closer to the shore, the greater the amount of water directly infiltrates, and the farther away from the shore, the less water. Therefore, as designed above, water is evenly distributed to each area of ​​the wetland where water purification can be carried out.

[0031] In this embodiment: for the overall layout of the wetland park, specifically, Figure 1-2, a first purification area 7, a transfer pool 8, a second purification area 9, and a water storage pool 6 can be sequentially arranged in the wetland along the direction of water flow. The transfer pool 8 and the water storage pool 6 are hollow structures, that is, the interior can be a man-made pond, or a natural gully, pit, etc., and the internal space is used to store water. The water flowing through the higher side of the wetland flows into the transfer pool 8. During implementation, the first purification area 7 and the second purification area 9 are wetland entities. As one of the specific implementation structures, such as Figure 2 The first purification zone 7 and the second purification zone 9 include purification plants 13, upper filter contact purification filler 17 and lower filter contact purification filler 18 from top to bottom, and the particles of the upper filter contact purification filler 17 are smaller than the lower filter contact purification filler 18, and the water is continuously purified in sequence, and the scum and particles of different particle sizes are filtered out step by step to make the water gradually clear.

[0032] During the specific construction, the depth of the transfer tank 8 is consistent with the bottom depth of the lower filter contact purification filler 18 to receive the water flowing out of the first purification area 7. The transfer tank 8 and the two purification areas are similarly connected by water distribution pipes 11 installed at different depths to continue to transport the water to the next low-lying second purification area 9 for purification. That is, after the water from the first purification area 7 flows into the transfer tank 8, it is purified again in the second purification area 9 and then flows into the water pool 6 for storage. If necessary, some green plants are planted to form a natural lake landscape.

[0033] In this embodiment: for the transfer pool 8, Figure 2 As shown, during the construction of the transfer pool 8, a brick wall or other masonry 10 can be directly built. In addition, an overflow wall 12 can be provided on the side of the transfer pool 8 close to the first purification area 7. The bottom end of the overflow wall 12 starts from the bottom of the transfer pool 8, and the top end is lower than the pool mouth of the transfer pool 8, so that the water flowing into the first purification area 7 can overflow from the top of the overflow wall 12 and enter the right side space of the transfer pool 8. The water in the right side space contains fewer particulate matter, so that it can continue to be transported to the wetland in the next area. In addition, floating leaf landscape plants 14 floating on the water surface are planted in the water of the transfer pool 8. These floating leaf landscape plants 14 can decompose the remaining organic matter in the transfer pool 8 again. Since the decomposition will produce some gases containing carbon, nitrogen and oxygen, a gas pipeline 15 can be further provided in the transfer pool 8. The gas pipeline 15 is densely distributed in the clusters of floating leaf landscape green plants 14. The pipe sections of the gas pipeline 15 located in the clusters of floating leaf landscape green plants 14 are arranged with a number of air inlets to absorb the above-mentioned gases. The pipe sections of the gas pipeline 15 located in the clusters of purification plants 13 in the purification area are provided with a number of air outlets to discharge the above-mentioned gases. An air pump is also installed on the gas pipeline 15 to transport part of the gas generated in the transfer pool 8 to the areas where other purification plants 13 are located over long distances to meet their growth needs, such as photosynthesis.

[0034] Finally, at the place where the sewage enters the wetland park, there is also a sludge discharge pipe. One end of the sludge discharge pipe is located at the bottom of the filter pool 1, and the other end is connected to a sewage pump located in the ground machine room. The sewage pump can suck out the silt accumulated at the bottom of the filter pool 1 to prevent the filter pool 1 from overflowing. In addition, in order to better decompose and utilize, the outlet end of the sludge discharge pipe is located in the standby oxidation pool, and the valve between the standby oxidation pool and the standby nitrification reaction pool is opened when the sludge discharge pipe is opened, and the sludge is pumped into the above-mentioned reaction pool for purification and disposal, so that the partially purified sludge can be finally transported to other suitable locations in the wetland for cultivation of corresponding types of green plants, etc., to enrich the landscape.

[0035] In the above description of the present invention, it should be noted that the terms "one side", "the other side", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of the invention is usually placed when in use, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0036] In addition, the term "same" does not mean that the parts must be absolutely the same, but slight differences are allowed. The term "vertical" only means that the positional relationship between the parts is more vertical than "parallel", and does not mean that the structure must be completely vertical, but can be slightly tilted.

[0037] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. An ecological design structure of an ecological wetland park, comprising connecting a city drainage network to a wetland park so that sewage is naturally purified when flowing through the wetland park, characterized in that: A filter pool (1) is arranged in the upstream water level area of ​​the wetland park, and sewage enters the wetland through the filter pool (1). A plurality of filter nets are arranged in the filter pool (1), and the filter nets can concentrate and intercept part of the garbage in the sewage; The filtering pool (1) is directly connected to a gathering area (2) on the bank of the wetland. The gathering area (2) is semicircular, and its arc edge is the location of the slope surface (3) of the wetland. The slope surface (3) is covered with a protective net made of interwoven fine steel wires. The protective net can prevent the slope from collapsing due to the infiltration of sewage. Aquatic plants capable of decomposing and absorbing part of organic matter in sewage are also planted in the gathering area. The aquatic plants are planted on planting boards in the gathering area, and the planting boards float on the water surface in a floating manner; The gathering area is at the highest water level in the entire wetland park, and a water storage pool (6) is provided at the lowest water level in the wetland park. A water supply pipeline is installed in the water storage pool (6), and the water supply pipeline is connected to the greening irrigation pipeline network inside the wetland park.

2. The ecological design structure of the ecological wetland park according to claim 1 is characterized by: The filtration tank (1) is also connected to a backup oxidation tank, which initially oxidizes the sewage and then outputs it to a backup nitrification reaction tank. The backup nitrification reaction tank is connected to the gathering area (2) to further discharge the sewage that has undergone preliminary purification into the wetland.

3. The ecological design structure of the ecological wetland park according to claim 1 is characterized by: An arc-shaped water retaining dam (4) is provided on the periphery of the slope in the direction in which the slope surface extends. The water retaining dam (4) is provided with a plurality of water culverts. A water distribution pool (5) is formed between the water retaining dam (4) and the slope surface (3). A plurality of water distribution pipes (11) are provided from top to bottom in the water distribution pool (5). The water distribution pipes (11) are provided with control valves. The outlet end of the water distribution pipe (11) is inserted into the wetland. The water distribution pipe (11) is provided with a plurality of water distribution holes (16) along the axial direction of the pipe. All the water distribution holes (16) are located on the lower half of the pipe wall of the water distribution pipe (11). The aperture of each water distribution hole (16) gradually increases along the water flow direction.

4. The ecological design structure of the ecological wetland park according to claim 3 is characterized by: In the wetland, a first purification area (7), a transfer pool (8), a second purification area (9), and the water storage pool (6) are arranged in sequence along the direction of water flow, wherein the transfer pool (8) and the water storage pool (6) are hollow structures, and the internal space is used for storing water, and the first purification area (7) and the second purification area (9) are wetland entities.

5. The ecological design structure of the ecological wetland park according to claim 4 is characterized by: The first purification zone (7) and the second purification zone (9) both include, from top to bottom, a purification plant (13), an upper filter contact purification filler (17) and a lower filter contact purification filler (18), and particles of the upper filter contact purification filler (17) are smaller than particles of the lower filter contact purification filler (18).

6. The ecological design structure of the ecological wetland park according to claim 5 is characterized by: The depth of the transfer tank (8) is consistent with the bottom depth of the lower filter contact purification filler (18). The transfer tank (8) and the two purification areas are connected by the water distribution pipes (11) installed at different depths, so that the water from the first purification area (7) flows into the transfer tank (8), is purified again in the second purification area (9), and then flows into the water storage tank (6).

7. The ecological design structure of the ecological wetland park according to claim 5 is characterized by: An overflow wall (12) is provided on one side of the transfer pool (8) close to the first purification zone (7). The bottom end of the overflow wall (12) starts from the bottom of the transfer pool (8) and the top end is lower than the pool opening of the transfer pool (8), so that water flowing into the first purification zone (7) overflows from the top of the overflow wall (12) and enters the right side space of the transfer pool (8). In addition, floating leaf landscape green plants (14) floating on the water surface are planted in the water of the transfer pool (8). The floating leaf landscape green plants (14) can decompose part of the residual organic matter in the transfer pool (8) again.

8. The ecological design structure of the ecological wetland park according to claim 7 is characterized by: A gas pipeline (15) is also provided in the transfer pool (8). The gas pipeline (15) is densely distributed in the cluster of floating leaf landscape green plants (14). The pipe sections of the gas pipeline (15) located in the cluster of floating leaf landscape green plants (14) are all arranged with a plurality of air inlets. The pipe sections of the gas pipeline (15) located in the cluster of purification plants (13) in the purification area are provided with a plurality of air outlets, and an air pump is installed to transport part of the gas generated in the transfer pool (8) to the purification plants (13) for their growth needs.

9. The ecological design structure of the ecological wetland park according to claim 2 is characterized by: A sludge discharge pipe is also provided, one end of which is located at the bottom of the filter pool (1), and the other end is connected to a sewage pump located in a ground machine room, and the sewage pump can suck out the silt deposited at the bottom of the filter pool (1).

10. The ecological design structure of the ecological wetland park according to claim 9 is characterized by: The outlet end of the blood stasis discharge pipe is located in the standby oxidation tank, and the valve between the standby oxidation tank and the standby nitrification reaction tank is opened when the blood stasis discharge pipe is opened.

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