Rainwater overflow

Abstract

Stormwater overflow (100) in the form of a structure for dividing a combined sewer overflow (200) into a further throttled outflow (201) and a relief outflow (202) comprising an inlet (101) with a first cross-sectional area (QF1), a drain (102) for the further throttled outflow (201) with a second cross-sectional area (QF2), an outlet (103) for the relief flow (202), characterized in that an intermediate ceiling (104) is provided which divides the interior of the storm overflow (100) into a first sub-area (106) facing the inlet (101) and the outlet (102) and a second sub-area (107) facing the outlet (103), wherein at least one passage opening (108, 117) for the relief flow is formed in the intermediate ceiling (104), a sieve body (109, 118) is attached to the side of the through-opening (108, 117) facing the inlet (101), which extends into the first part (106) of the control overflow (100) and the sieve body (109, 118) forms a hollow body.

Description

[0001] The present invention relates to a storm overflow according to the preamble of claim 1. Technological background

[0002] A stormwater overflow is a structure that divides combined sewage runoff into a throttled outflow leading towards a sewage treatment plant and a relief outflow leading to the open air, e.g. into a body of water, such as a stream or gutter. A stormwater overflow is a relief structure and is used to divert critical runoff within the sewer system, i.e. to divide it as described above, without intermediate storage. A stormwater overflow therefore has no storage space. It does not serve as a retention tank. Stormwater overflows can have rake-shaped pollutant retention devices, but these quickly become blocked during heavy rainfall, thus requiring increased maintenance. Conventional stormwater overflows can also have baffles, which can be both over- or undermined during heavy rainfall.They only ensure a small percentage of floating matter is retained by a baffle. Suspended matter in the mixed water is not retained by a baffle. Printed state of the art

[0003] From DD 71 520 A1, a quantity-adjustable rain overflow is known, the drainage channel of which has a section that can be rotated about its longitudinal axis and / or about an axis transverse to it.

[0004] DE 26 03 665 shows a storm overflow which comprises a baffle with an opening at the bottom which serves as a drain line for a float chamber.

[0005] DE 1 290 891 shows a stormwater overflow with a screening device arranged in the discharge channel, which has means for conveying the retained solids into the main channel leading to the sewage treatment plant. The main channel, viewed in the direction of flow, bridges the discharge channel after the overflow weir as an open-topped channel into which a known, motor-driven screen forming a screening device conveys debris.

[0006] DE 27 43 580 describes a stormwater overflow with a screen made of galvanized sheet steel, inclined against the flow direction, terminating at the top in a vertical baffle plate and at the bottom in a cover plate resting on a concrete guide box. Below the discharge pipe is a discharge chamber from which the relief pipe branches off.

[0007] DE 40 15 414 A1 concerns a stormwater overflow in which a retention device in the form of a catch grate is provided between a baffle and an overflow sill to retain floating debris. The catch grate can be pivoted upward. The catch grate is located at the overflow and prevents contaminants from being flushed over the overflow sill.

[0008] Storm overflows equipped with a grating of the above-mentioned known designs have the problem that the grating must be cleaned after every rainfall event. The necessary cleaning measures are complex and time-consuming. This typically results in considerable maintenance costs. With current climate change, rainfall events are becoming increasingly frequent, so a further increase in maintenance costs is to be expected. Furthermore, gratings at the overflow sill of storm overflows are not always able to reliably capture contaminants such as cellulose particles. Object of the present invention

[0009] The object of the present invention is to provide a generic storm overflow with which, while achieving a good retention effect of contaminants such as floating and suspended matter, an effective reduction in maintenance costs can be achieved at the same time. Solution to the task

[0010] The above object is solved by the features of claim 1. Advantageous embodiments of the present invention are claimed in the dependent claims.

[0011] By providing an intermediate ceiling which divides the interior of the storm water overflow into a first partial area facing the inlet and the outlet and a second partial area facing the outlet, wherein at least one through-opening is formed in the intermediate ceiling, to which a sieve body is connected on the side of the through-opening facing the inlet, which sieve body extends into the first partial area of ​​the control overflow and the sieve body forms a hollow body, it is achieved that both floating matter and suspended matter can be effectively retained by the sieve body.Because the screen body is formed from a hollow body, a significantly larger surface area is effective for trapping contaminants, resulting in a significantly reduced flow velocity through the perforation of the screen body. Therefore, floating and suspended matter cannot press into these perforations, become wedged, and subsequently clump together, thus clogging the screen perforation. Furthermore, the inventive design makes it possible to retrofit existing storm overflows.

[0012] According to a practical embodiment of the present invention, several through-openings can be provided in the suspended ceiling, with a sieve body connecting the several through-openings to one another. This enables a good retention function even at increased flow rates.

[0013] According to a practical embodiment of the present invention, the sieve body can be designed to be self-contained within the first partial area. This ensures an excellent retention effect of up to 100% for floating and suspended matter larger than the perforation.

[0014] According to an advantageous embodiment of the present invention, several screen bodies can be arranged within the first partial area of ​​the storm overflow. The screen bodies can preferably be positioned parallel to one another.

[0015] According to a practical embodiment of the present invention, the sieve body can have a round or oval cross-section. This also results in an enlarged flow surface.

[0016] According to an advantageous embodiment of the present invention, the sieve body can have a tubular shape over at least a portion of its total length, preferably over its entire length. This allows for an enlarged flow surface through the sieve body, since flow can occur from all sides of the sieve body.

[0017] According to an advantageous embodiment of the present invention, the sieve body can have a vertically extending sieve body section and a horizontally extending sieve body section, with the two sieve body sections adjacent to one another. This also achieves advantageous retention efficiency.

[0018] According to an expedient embodiment of the present invention, the first sub-area and the second sub-area can be connected to one another via at least one emergency overflow, wherein in an emergency, relief can be effected via the at least one emergency overflow in addition to the at least one through-opening.

[0019] According to an expedient embodiment of the present invention, the emergency overflow may have an emergency overflow threshold positioned above the at least one passage opening.

[0020] According to an expedient embodiment of the present invention, the emergency overflow can have a dome extending vertically upwards from the suspended ceiling.

[0021] According to a practical embodiment of the present invention, the emergency overflow can be located below an inspection shaft and / or, when viewed from above, in a space between two screens. This makes it possible to access the second section and conduct an inspection.

[0022] According to a practical embodiment of the present invention, the sieve body can be constructed from a metal or plastic mesh. The metal or plastic mesh is preferably curved.

[0023] According to a practical embodiment of the present invention, the suspended ceiling can be constructed or laid from several panels arranged side by side. This allows the panels to be advantageously moved through the inspection shaft into the interior of the base body and secured there.

[0024] According to an advantageous embodiment of the present invention, the panels can be suspended from and / or secured to at least one retaining device attached to the inner wall of the base body. For example, this can be a retaining rail, in particular an L-shaped retaining profile.

[0025] According to an expedient embodiment of the present invention, the storm overflow, preferably its base body including intermediate ceiling and sieve body, can be designed as a prefabricated component.

[0026] According to an expedient embodiment of the present invention, the first cross-sectional area may be larger than the second cross-sectional area.

[0027] According to an expedient embodiment of the present invention, the storm overflow may not comprise any significant storage volume of its own. Description of the invention based on exemplary embodiments

[0028] Advantageous embodiments of the present invention are explained in more detail below with reference to the drawings. They show: Fig. 1 a roughly simplified schematic representation of an exemplary combined sewer system with a storm overflow; Fig. 2 is a partial sectional view of an example of a storm overflow according to the present invention; Fig. 3 a plan view of the storm water overflow after Fig. 1 in levels AA in Fig. 1; Fig. 4 a sectional view of the storm overflow according to Fig. 1 in level BB in Fig. 2; Fig. 5 a sectional view of the storm water overflow according to Fig. 1 in the plane CC in Fig. 3; and Fig. 6 a simplified representation of an exemplary structure of the intermediate ceiling of the storm overflow according to the invention.

[0029] Fig. 1 shows a highly simplified schematic representation of an overall system for combined sewage treatment. This overall system comprises a plurality of individual combined sewage outflows 200, which serve to combine combined sewage from, for example, different local areas and transport it further until it reaches a treated body of water 205. In the combined sewage outflow 200, for example from the farmstead 206, there is a so-called storm overflow 100. A storm overflow 100 divides the combined sewage outflow 200 into a throttle outflow 201, which continues towards a sewage treatment plant 204, and a relief outflow 202. The relief outflow 202 flows, for example, into a ditch, a stream, or a body of water. As a structure, a storm overflow 100 does not have any significant storage volume of its own. A storm overflow 100 serves to mitigate high combined sewage discharge peaks during heavy rainfall events.A stormwater overflow basin can be arranged as a flow-through basin 203 in the area of ​​the combined sewer outlet 200. Flow-through basins 203 serve to mechanically treat the combined sewer. The combined sewer outlet 200 upstream of the stormwater overflow 100 contains a variety of contaminants in the form of floating and suspended matter. Cellulose particles, in particular, are increasingly found in the combined sewer outlet 200.

[0030] Fig. Figure 2 shows a side view of the interior of an example of a storm overflow 100 according to the invention. The storm overflow 100 has a base body 123, which forms the outer shell of the structure. The storm overflow 100 has an inlet 101 with a first cross-sectional area QF1 and an outlet 102 with a second cross-sectional area QF2. The outlet 102 merges into the further combined sewer drain 200, which leads to the wastewater treatment plant 204. The first cross-sectional area QF1 of the inlet 101 is larger than the second cross-sectional area QF2 of the outlet 102, so that the outflow via the outlet 102 represents a throttled outflow 201.

[0031] A suspended ceiling 104 is inserted into the interior of the base body 123, dividing the interior of the base body 123 into a first sub-area 106 and a second sub-area 107. The first sub-area 106 is located in the area of ​​the flow channel 116, which connects the inlet 101 and outlet 102.

[0032] The intermediate ceiling 104 is equipped with an emergency overflow 110, which has a dome 122 in the form of a circumferential vertical wall, with an emergency overflow threshold 121 located on the top of the dome 122.

[0033] Within the first sub-area 106, two sieve bodies 109 and 118 are provided, whereby Fig. 2, only the sieve body 109 is visible. The sieve body 109 comprises vertical sieve body sections 119, which are connected to one another by a horizontal sieve body section 120. The vertical sieve body sections 119 rest against the suspended ceiling 104 in the region of through-openings 108 and 117. As a result, the respective sieve body 109, 118 extends into the first sub-area 106, with the respective sieve body 109, 118 each forming a hollow body. During a heavy rain event, water can flow through the sieve bodies 109, 118 and reach the second sub-area 107.

[0034] The respective sieve body 109, 118 is formed as a closed unit within the first partial area 106.

[0035] In the upper area of ​​the base body 123, a first inspection shaft 111 is located laterally offset on the base body 123. The first inspection shaft 111 serves to inspect the storm overflow 100 above the suspended ceiling 104. For this purpose, a ladder 126 can be provided in the area of ​​the first inspection shaft 111.

[0036] In addition to the first inspection shaft 111, a second inspection shaft 112 is located approximately centrally on the top side of the base body 123. This serves to inspect the area below the suspended ceiling 104, i.e., the first section 106 of the storm overflow 100. A ladder 115 can also be provided for this purpose. This can extend from the second inspection shaft 112 down into the area of ​​the drainage channel 116.

[0037] As from Fig. 3, the emergency overflow 110 is located (viewed in plan view) between the two sieve bodies 109, 118 running parallel to each other. This allows the ladder 115 to extend downwards and a person to go down without any problem.

[0038] As from Fig. As can also be seen in Figure 3, the two sieve bodies 109, 118 cover a considerable area of ​​the first sub-area 106. The sieve bodies 109, 118 have a round cross-section and an elongated tubular shape. Alternatively, the sieve bodies 109, 118 can also have an oval cross-section or another curved cross-section.

[0039] Also from Fig. Figure 3 shows the outlet 103, through which mixed water that has flowed through the openings 108, 117 from the first section 106 into the second section 107 due to a heavy rainfall event can be diverted and flowed outward. The same applies to mixed water that has flowed upward through the emergency overflow 110.

[0040] Fig. Figure 3 shows a storm overflow 100 in which only one emergency overflow 110 is provided in the suspended ceiling 104. Alternatively, however, a plurality of emergency overflows 110 can also be arranged in the suspended ceiling 104.

[0041] Out of Fig. 4 and Fig. 5, the formation of the flow channel 116 is clearly visible. It decreases steadily in width from the inlet 101 to the outlet 102 and is bounded laterally by respective berms 124, 125. Fig. 4 and Fig. 5 also clearly shows that the respective sieve body 109, 118 extends significantly into the first sub-area 106, starting from the intermediate ceiling 104. This ensures that, during a heavy rainfall event, a sufficient flow through the respective sieve body 109, 118 into the second sub-area 107 is maintained. At the same time, suspended matter, such as cellulose particles, is effectively retained without adversely reducing the flow velocity during discharge toward the outlet 103. The water can flow outward from the interior of the stormwater overflow 100 or its base body 123 via the weir sill 105.

[0042] Due to its design, the present invention can also be used particularly advantageously in existing storm overflows. In this case, it is merely necessary to install an intermediate ceiling 104 in the main body 123 of an existing storm overflow and to attach the relevant screen bodies 109, 118 to the underside of the intermediate ceiling 104. Thus, only adaptation measures are necessary that divide the interior of the main body 123 into a first sub-area 106 and a second sub-area 107, so that in the event of heavy rainfall, the mixed water in question discharges exclusively through the through-openings 108, 117, and possibly, if there is too much water, via the emergency overflow 110, into the second sub-area 107.

[0043] Alternatively, the storm overflow 100 according to the invention can also be designed as a prefabricated component. For example, the base body 123 can be a prefabricated concrete component to be delivered to the construction site, into which a GRP intermediate ceiling with attached sieve bodies is inserted.

[0044] The sieve bodies 109, 118 are preferably those constructed from a metal grid or a plastic grid.

[0045] According to an expedient embodiment of the present invention, the intermediate ceiling 104 is formed by a plurality of plates 128 arranged parallel to one another, which according to Fig. 6 each rest on a holder 126, 127. The holding device 126, 127 can each be designed, for example, as an L-beam, which is fastened to the inner wall of the base body 123. The respective plate 128 can be connected to the holding device 126 or 127 with screws 129, 130 in order to secure the intermediate ceiling 104 in its position against water pressure from below. The respective plate 128 extends from one to the other side of the base body 123. In the direction perpendicular to the plane of the drawing of Fig. In the direction viewed in Figure 6, the individual panels 128 abut one another and form the suspended ceiling 104. Due to this design, the suspended ceiling 104 can be easily installed, even though access is only provided via the first and second inspection shafts 111 and 112, respectively. The width of the panels 128 must be dimensioned such that they fit through the inspection shafts 111 and 112, respectively.

[0046] The present invention provides a storm overflow with improved pollutant retention efficiency compared to prior art designs without adversely affecting the relief flow. The present invention therefore represents a very special contribution to the relevant field of technology. LIST OF REFERENCE SYMBOLS 100 storm overflow 101 Enema 102 Procedure 103 Outlet 104 suspended ceiling 105 weir threshold 106 first sub-area 107 second sub-area 108 passage opening 109 sieve bodies 110 Emergency overflow 111 Inspection shaft 112 Inspection shaft 113 lids 114 lids 115 ladders 116 Flow channel 117 Passage opening 118 sieve bodies 119 Sieve body section 120 sieve body section 121 Emergency overflow threshold 122 Cathedral 123 basic bodies 124 Berm 125 Berm 126 Holding device 127 Holding device 128 plate 129 Screw 130 screw 200 combined sewerage drains 201 throttled discharge 202 relief outflow 203 Stormwater overflow basin / here as a flow-through basin 204 sewage treatment plant 205 bodies of water 206 farmstead QF1 first cross-sectional area QF2 second cross-sectional area QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] DE 26 03 665

[0004] DE 1 290 891

[0005] DE 27 43 580

[0006] DE 40 15 414 A1

[0007]

Claims

[1] Stormwater overflow (100) in the form of a structure for dividing a combined sewage outflow (200) into a further throttle outflow (201) and a relief outflow (202) comprising an inlet (101) with a first cross-sectional area (QF1), an outlet (102) for the further throttle outlet (201) with a second cross-sectional area (QF2), an outlet (103) for the relief outflow (202), characterized by , that an intermediate ceiling (104) is provided which divides the interior of the storm water overflow (100) into a first partial area (106) facing the inlet (101) and the outlet (102) and a second partial area (107) facing the outlet (103), wherein at least one through-opening (108, 117) for the relief outflow is formed in the intermediate ceiling (104), a sieve body (109, 118) is connected to the side of the through opening (108, 117) facing the inlet (101), which extends into the first partial area (106) of the control overflow (100) and the sieve body (109, 118) forms a hollow body. [2] Storm overflow according to claim 1, characterized by that a plurality of through openings (108, 117) are provided in the intermediate ceiling (104) and a sieve body (109, 118) connects the plurality of through openings (108, 117) to one another. [3] Storm overflow according to claim 1 or 2, characterized by that the sieve body (109,118) is closed within the first partial area (106). [4] Storm overflow according to the preceding claims, characterized by that a plurality of sieve bodies (109,118) are arranged within the first partial area (106). [5] Storm overflow according to the preceding claims, characterized by that the sieve body (109,118) has a round or oval cross-section. [6] Storm overflow according to the preceding claims, characterized by that the sieve body (109,118) has a tubular shape at least over a portion of its total length. [7] Storm overflow according to the preceding claims, characterized by that the sieve body (109,118) has a vertically extending sieve body section (119) and a horizontally extending sieve body section (120). [8] Storm overflow according to the preceding claims, characterized by that the first partial area (106) and the second partial area (107) are connected to one another via at least one emergency overflow (110), via which relief can take place in addition to the at least one through opening (108, 117). [9] Storm overflow according to claim 8, characterized by that the emergency overflow (110) has an emergency overflow threshold (121) which is positioned above the at least one through opening (108, 117). [10] Storm overflow according to claim 9, characterized by that the emergency overflow (110) has a dome (122) extending vertically upwards, preferably vertically upwards, from the intermediate ceiling (104). [11] Storm overflow according to claims 8 to 10, characterized by that the emergency overflow (110) is located below an inspection shaft (112) and / or in the projection from above in a free space (123) between two sieve bodies (109, 118). [12] Storm overflow according to the preceding claims, characterized by that the sieve body (109, 118) is constructed from a metal grid or plastic grid. [13] Storm overflow according to the preceding claims, characterized by that the intermediate ceiling (104) is constructed from several panels (126) arranged next to one another. [14] Storm overflow according to claim 13, characterized bythat the plates (126) are suspended in and / or fastened to at least one holding device (126, 127) attached to the inner wall of the base body (123). [15] Storm overflow according to the preceding claims, characterized by that the storm overflow (100), preferably its base body (123) including intermediate ceiling (104) and sieve body (109, 118), is or are designed as a prefabricated component. [16] Storm overflow according to the preceding claims, characterized by that the first cross-sectional area (QF1) is larger than the second cross-sectional area (QF2). [17] Storm overflow according to the preceding claims, characterized by that the storm overflow (100) does not have any significant storage volume of its own.

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