EP2000603A2 - Drainage system - Google Patents

Abstract

The drainage system (1) has a drainage pipe (7) and multiple drain duct (4) emptying into the drainage pipe. The drainage duct has drainage pipe extending perpendicularly into it with inflow end. A bell shaped cap covers the inlet of the drainage pipe and the area of the drainage pipe outer cover adjacent to the inlet, such that a drainage gap is unsealed between a sub area of the cap inner cover and the drainage pipe outer cover.

Description

The invention relates to a drainage system for a surface or road o. The like. In such drainage systems, there is the safety problem that burning fluids can flow into the drainage system after accidents or fires and so can transport a punctual fire so that spreads this area.

On this basis, the present invention seeks to design a drainage system so that a spread of a punctual fire on the drainage system is effectively prevented. This object is achieved by the combination of features of claim 1 by simple means in an inventive manner. The dependent claims contain in part expedient and in part self-inventive developments of the invention.

The inventive drainage system consists of one or more drainage pipes. In each of these lines run-offs open at regular or irregular intervals. In particular, such an arrangement of roadways is known, on which edges at certain intervals drainage shafts are arranged. Above all, the invention is suitable for fire-protected drainage of tunnel lanes, in which the drainage lines due to the fluidic conditions in the tunnel burning fluids forward very quickly, so spread especially in tunnels fires on the drainage pipes unusually fast.

The solution to the problem consists in a structurally very simple and therefore inventive development of the downcomers. In each downcomer, a drain pipe is first introduced. This drain pipe protrudes with its inlet end vertically into the downcomer. The end of the drain pipe facing away from the inlet end opens into the bottom or a side wall of the downcomer. The vertical projecting into the downcomer drainpipe forms as it were a standpipe. About the inlet end of the inlet end of the drain pipe, a bell-shaped hood is slipped. The slipped hood leaves both a radial gap between their hood inner shell on the one hand and the Ablaufrohrauraußenmantel on the other hand free. Also, the inside of the top surface of the hood is not located on the opening edge of the inlet opening, but is also arranged at a distance from the opening edge of the inlet opening to release here also a drain gap for the fluid to be discharged.

The fluid to be discharged first runs into the downcomer and fills it up to the height of the opening edge of the inlet opening of the drainage pipe. Only when the liquid level of the fluid to be discharged exceeds the height level of the opening edge, the fluid to be discharged flows through the inlet opening into the drain pipe.

Due to the patch on the outlet bell-shaped hood, the fluid does not flow directly into the drain pipe, but previously passed the drain gap formed between the hood and the inlet end of the drain pipe. If such a large amount of fluid introduced into the downcomer that the current fluid level projects beyond the height of the drain pipe, the fluid according to the law of communicating tubes is pumped even with overpressure through the flow gap as it were. For this purpose, the cross-sectional area of the drainage gap is dimensioned in particular such that it is equal to or greater than the free cross-sectional area of the drainage pipe. Thus, the amount of liquid that can be transported away via the discharge pipe continues to depend on the cross-sectional area of the discharge pipe, but not on the cross-sectional area of the discharge gap.

While a sufficient amount of oxygen is present in the downcomer to keep a burning fluid from burning, the supply of oxygen to the fluid is abruptly interrupted as a result of the labyrinthine outflow gap formed by the hood and the downcomer shell. Due to this abrupt interruption of the oxygen supply, the flame holding the fluid burning is stifled. A supply of oxygen to maintain the burning process from the drain pipe is not possible because the fuel gases of the burning fluid collect in the hood. As a result, a slight overpressure builds up in the hood. Thus, rising in the drain pipe colder oxygen-rich air is forced back into the drain pipe due to pressure equalization.

The fluid is discharged via the drainage line without burning further. As a result of the suffocation of the flame due to the lack of oxygen, a spreading of the punctual fire is effectively prevented by the fluid passed through the drainage line.

With the invention it is thus possible to effectively prevent the spread of fire over leaking burning liquids. Damage to the often made of a plastic, in particular made of PVC, drainage pipe is thus safely avoided. Thus, after the occurrence of a punctual fire no costly renovation work to replace or repair the drainage pipe is necessary. Due to the removal of excess combustible fluid in addition, the duration of the punctual fire is reduced, if from a certain point no more flammable fluid flows.

In addition, the hood outer wall acts as a baffle. In other words, impurities floating on the fluid surface or an oil film formed on the fluid surface can not enter the drainpipe from the drainage gap. Thus, a rough pre-cleaning of the discharged from the drain pipe fluid.

The invention is therefore particularly suitable for use in traffic tunnels and enclosures and on operating surfaces of the process industry, in particular the chemical industry, refineries or the like.

In a typical design, the drainpipe has a diameter of DN100 and the hood has a diameter of DN200. The diameter of the drain pipe leading away drain pipe is at a diameter of DN150. With a downcomer of these dimensions, the swallowing capacity is about 15 l / s. In other words, 15 l of fluid can be diverted from the downcomer per second.

According to the teaching of claim 2, it is advantageous to design the flow gap between the hood inner shell and Ablaufrohraußenmantel as a circumferential gap with preferably constant gap width. In this way, a comparatively large amount of fluid can be transported away while maintaining the interruption of the oxygen supply in the outlet gap.

Claim 3 relates to an embodiment of the invention with a double function of the hood. In this embodiment, the hood is arranged movable relative to the drain pipe. The hood is displaced in this way in the vertical direction between an open position and a closed position back and forth. The open position is unchanged from the functional position of the rigid variant of the invention with respect to the drain pipe stationary fixed hood. For conversion to its closed position, the hood is moved in the vertical direction on the drain pipe so far toward the bottom of the downcomer until a arranged on the inside of the hood closure cover or the top surface of the hood rests firmly on the opening edge of the inlet opening and the inlet opening so tight closes. In order to ensure the automatic liquid drainage when the drainpipe is closed, the hood is designed so that it swims upwards in the downcomer as the liquid level rises. Thus, the flow gap between the top surface of the hood and the opening edge of the inlet opening is released again, so that the fluid can escape through the flow gap unhindered. The hood is in this case secured to the drain pipe so that a floating of the hood beyond the open position, in which the flow gap is completely released, effectively prevented.

The fluid drains below the burning fluid surface. If the liquid level drops, the cover arranged on the hood inner shell closes the inlet opening of the drain pipe again. A penetration of burning fluid is thus safely avoided when the liquid level drops.

Claims 4 and 5 relate to two different possible arrangements of the drain pipe in the downcomer. In the embodiment according to claim 4, the drain pipe opens into the bottom of the downcomer. It is therefore a vertically extending, strictly cylindrical pipe section. The embodiment according to claim 5 relates to an arcuate pipe section, which opens into a side wall of the downcomer. Both variants are well suited for insertion into existing drain lines in the bottom or a side wall of the drain shaft. According to the teaching of claim 6, finally, the annular space between the Ablaufrohrauraumantel and the associated mouth opening in the bottom or in the side wall is additionally secured by an annular seal. The ring seal can also compensate for dimensional accuracy or other tolerance errors. To further secure the annulus seal at this interface between the drain pipe and the actual drainage pipe, the additional clamping plates are provided according to claim 7.

The claims 8 and 9 relate to an alternative embodiment of the fixation of the drain pipes at the bottom or the side wall of the downcomer. Here, a mounting flange is arranged at the end of the drain pipe in the region of the outlet opening. With the help of this mounting flange, the drain pipe can be fixed either on the floor or on a side wall of the drainage shaft with several screws. In a further development is proposed according to claim 9, to switch between the mounting flange and the mounting flange holding the bottom or the mounting flange holding side wall between a gap seal. This variant also prevents unwanted escape of the fluid outside of the drain pipe.

The variants according to claims 4 to 9 are also particularly well suited for retrofitting existing downcomers with the inventive fire protection.

In claim 10, finally, a variant for fixing the drain pipe in the bottom or a side wall of the downcomer is proposed, in which the Drain pipe embedded in the soil or the side wall form-fit, in particular is concreted. The positive embedding takes place during the manufacture or prefabrication of the downcomer. When form-fitting molding of the drain pipe in the downcomer, it is expedient to provide a circumferential wall ring on the drain pipe. The encircling wall ring jumps radially outward in the manner of a rotating disc out of the drain tube outer jacket. This radially projecting disc prevents a formation or hollowing of a gap between the Ablaufrohraumantelmantel and the drainpipe-embedding material, in particular concrete. In particular, due to the capillary action of the water, it may occasionally happen that unwanted passage channels between the Ablaufrohrauraumantel and the drainpipe embedding material form. This channel formation is effectively prevented due to acting as a blocking plate wall ring.

Claim 11 finally includes an embodiment of the invention with an upstream in the flow direction of the drain pipe sludge buckets in the downcomer. Such a sludge bucket favors keeping the downcomer clean because leaves, mud and other contaminants are collected in the sludge bucket. In order to keep the discharge shaft clean, the end grate must be lifted off the drain shaft and then the sludge bucket lifted out, emptied and cleaned. In addition, the sludge bucket throttles and evenifies the amount of liquid supplied to the downcomer. As a result, the risk of a strong turbulence of the fluid before it enters the outlet gap, combined with the possible discharge of a local fire source via the outlet gap into the drain tube, is low.

In this embodiment, a certain amount of water always collects in the sludge bucket, so that the actual downcomer is dry inside. In these conditions, it is then desirable that the drain pipe is closed by means of the hood. The hood then has the function of an odor trap. Finally, the invention also favors the cleanliness of the drainage shaft. Due to the flow gap can be due to the two-way reversal and the reduction of the flow velocity of the fluid Impurities in the fluid, particulate matter contained in the fluid and solids, penetrate only to a limited extent in the drain pipe. The impurities are deposited outside the drainpipe at the bottom of the downcomer, where they can easily be skimmed off or sucked off.

Fig. 1

ein Entwässerungssystem,

Fig. 2 bis 3

einen ersten Ablaufschacht,

Fig. 4 bis 5

einen zweiten Ablaufschacht,

Fig. 6

eine Seitenwand eines Ablaufschachtes,

Fig. 7

einen Boden eines weiteren Ablaufschachtes, sowie

Fig. 8 bis 9

die Seitenwände zweier weiterer Ablaufschächte.

Based on the embodiments listed below, the invention with further advantages and features is further described. Show it:

Fig. 1

a drainage system,

Fig. 2 to 3

a first downcomer,

4 to 5

a second downcomer,

Fig. 6

a side wall of a downcomer,

Fig. 7

a bottom of another downcomer, as well

Fig. 8 to 9

the side walls of two further downcomers.

According to Fig. 1 For example, a drainage system 1 has a drainage channel 3 formed in the longitudinal direction 2. The drainage system 1 is shown in a longitudinal section 2 cut side view. The gutter 3 is at the edge of a in the Fig. 1 not shown roadway arranged. The drainage system 1 has in the longitudinal direction 2 a plurality of spaced-apart drainage shafts 4. The downcomers 4 break through the gutter 3 and lead substantially in the vertical direction 5 in the ground. Each downcomer 4 is connected by means of a drain line 6 with a longitudinal direction 2 extending drainage line 7. A, for example, due to a precipitate on the roadway accumulating liquid is passed through the gutter 3, the drain chutes 4 and the drain lines 6 to the drainage line 7 and discharged from this.

In the Fig. 1 In this case, only a section of the gutter 3 with three downcomers 4 is shown. Here are the left and the right drain hole 4 in a first in the Fig. 2 and 3 variant described and the middle downcomer 4 in a second in the Fig. 4 and 5 described variant executed.

Fig. 2 shows the first variant of the downcomer 4. The downcomer 4 is a downwardly from the gutter 3 from substantially in the vertical direction 5 downwardly extending and closed down cuboid hollow body. The hollow body has four side walls 8 and a bottom 9. He is poured from a concrete. On one of the side walls 8 near the bottom 9, a circular mouth opening 10 is arranged. In this mouth opening 10, the end of the drain line 6 is attached. The drain line 6 in turn leads to the drainage line 7, as shown in the Fig. 1 is shown. In the downcomer 4, a drain pipe 11 opens. The drain pipe 11 is designed as a 90 ° elbow. It protrudes with its inlet end 12 in the vertical direction 5 into the downcomer 4. The outlet end 12 facing away from the drain end 13 opens with its outlet opening 13 'in the drain line 6. The drain pipe 11 is held with its Ablaufrohraußenmantel 14 of an inserted into the end of the drain line 6 annulus seal 15. The annular space seal 15 seals the annular space formed between the drain pipe outer casing 14 and the inside of the drainage pipe 11. The annular space seal 15 is fixed in position by means of clamping plates 16.

About the inlet end 12 final inlet opening 17 of the drain pipe 11, a bell-shaped hood 18 is slipped. The hood 18 is designed as a hollow cylinder which is closed in the vertical direction 5 upwards by a top surface 19 designed as a dished bottom. At Ablaufrohrauraumantel 14 is in the region of the inlet end 12 of the drain pipe 11 in the vertical direction 5 upwardly extending and the hood 18 at its free end by cross-retaining pin 20 is attached. The retaining bolt 20 connects via a wing nut 21, the hood 18 releasably connected to the inlet end 12. In this way, a spacing of the hood 18 to the inlet end 12 of the drain pipe 11 is reached. In this case, a drain gap 25 is formed both between a portion of the hood inner shell 22 and the Ablaufrohraußenßenmantel 14 and between the inside 23 of the top surface 19 of the hood 18 and the opening edge 24 of the inlet opening 17. This outlet gap 25 has the geometry of an annular gap with a constant gap width in the area in which the hood 18 covers the downpipe 12.

Directly below the gutter 3 is a penetrated by recesses 26 and the entire cross section of the downcomer 4 obstructing sludge bucket 27 is arranged. For the discharge of a fluid, the interior of the downcomer 4 forms a fluid collection chamber 28. The fluid taken up by the fluid collection chamber 28 may also be a burning liquid such as gasoline, due to an accident occurring on the roadway in the downcomer 4 and thus in the Fluid collection chamber 28 enters. Coarse impurities contained in the fluid, such as leaves, stones or the like, are collected in the sludge bucket 27. The sludge bucket 27 also limits the amount of fluid flowing to the fluid collection chamber 28 per unit time. The fluid fills up the fluid collection chamber 28 up to the height of the opening edge 24 of the inlet opening 17 of the drainage pipe 11. If the liquid level of the fluid exceeds the height level of the opening edge 24, the fluid flows through the inlet opening 17 into the drainage pipe 11 and is led via the drainage line 6 to the drainage line 7.

The fluid is not passed directly, but via the detour of the flow gap 25 in the drain pipe 11. Therefore, there are two effects. On the one hand, a discharge of the fluid takes place with a time delay only when the liquid level of the fluid is above the height level of the opening edge 24. As a result, particulate matter contained in the fluid, which has passed through the recesses 26 of the sludge pail 27, settles on the bottom 9 of the downcomer 4 due to a slowing down of the flow velocity of the fluid. The suspended matter thus does not reach the drain line 6.

On the other hand, in the outlet gap 25, the oxygen supply to the fluid is interrupted abruptly. If it is a burning fluid, the flame holding the fluid burning is safely smothered. In this way it is ensured that the burning fluid is not entered into the drain line 6. Rather, it comes at best to a local fire in the downcomer 4. An extension of the fire is thus effectively avoided.

The sludge bucket 27 causes throttling and equalization of the amount of liquid supplied to the downcomer 4. This avoids a surge-like entry of the fluid into the outlet gap 25. Fire pockets trapped in air bubbles in the fluid can thus not enter the drainage pipe 6.

Thus, the drain pipe 11 and the hood 18 can withstand fire, they are made of a heat-resistant stainless steel. This stainless steel is for example V4A. V4A is not only heat resistant, but also resistant to corrosion and aging. Also all other components, such as the retaining bolts 21 or the clamping plates 16, which may be exposed to fire, are advantageously made of such a stainless steel. All components can be pickled and passivated as additional protection. The wing nut 21 allows rapid disassembly of the hood 18 for inspection purposes or for flushing the drain pipe. 6

Fig. 3 shows the downcomer according to arrow III in Fig. 2 seen again from the side of the drain pipe 6 ago. Also visible is a pipe flange 29, via which the drain line 6 can be screwed either to another pipe section of the drain line 6 or to the drainage line 7. This pipe flange 29 is in the Fig. 2 not shown.

Fig. 4 shows in a longitudinal section in the vertical direction 5, the second variant of the downcomer 4 from Fig. 1 , Fig. 5 shows the downcomer Fig. 4 in a cross section transverse to the vertical direction 5 according to the in Fig. 4 Plotted sectional plane VV. The Indian Fig. 1 to be seen upper portion of the downcomer with the Schlämmimer is in the Fig. 4 and 5 not shown. The functioning of the in the Fig. 4 and 5 Downstream well 4 essentially corresponds to the in the Fig. 2 and 3 illustrated variant. It is therefore only discussed the differences to this variant.

The drain line 6 is arranged centrally in the bottom 9 of the downcomer 4 in a mouth opening 10. The drain pipe 11 is formed as a straight pipe piece extending in the vertical direction 5. It's like the drainpipe in the FIG. 2 and 3 held by an annulus seal 15 in the drain line 6 and sealed against it. The hood 18 is arranged opposite the drain pipe 11 in the vertical direction 5 movable. For this purpose, the hood 18 has on its outside three guide tabs 31 arranged in the radial direction 30. Furthermore, a stud holder 32 is attached to the inlet end 12 of the drain pipe 11 at Ablaufrohrauraumantel. The bolt holder 32 is embodied as a bolt circle welded onto the drain pipe outside jacket, which has three retaining tabs 34 projecting in the radial direction 30. At each retaining tab 34, a guide pin 35 is attached end. Each guide pin 35 passes through an inserted into a guide plate 31 recess in a guide sleeve inserted into the recess 36. At the vertically upward of the retaining tab 34 opposite side, each guide pin 35 held by a wing nut 21, pushed onto the guide pin 35 End stop 37 on. In the area of the guide lugs 31, a closure cover 38, which is designed as a circular disk and extends over the entire hood cross-section, is fastened to the hood inner casing 22. This closure cap 38 is in the closed position of the hood 18 on a on the opening edge 24 arranged around seal 40. As a result, it closes the inlet opening 17 and seals it. The seal 40 is designed as a plug-on rubber seal which receives the opening edge 24 in its interior.

If fluid now accumulates in the fluid collection chamber 28, the hood 18 is lifted upwards in a vertical direction 5 by buoyancy according to the Archimedean principle, starting at a certain liquid level. If further fluid flows in, the hood 18 will be up to its in the Fig. 4 raised dashed opening position raised. This open position is predetermined by the three end stops 37 of the three guide pins 35.

If the downcomer 4 is acted upon by a burning fluid, the hood 18 is raised in the vertical direction 5 and the closure cap 38 releases the inlet opening 17 of the drainage tube 6. The fluid drains below its burning surface. If the liquid level drops again, the hood 18 moves in the vertical direction 5 towards the bottom 9 of the downcomer 9. Of the Closure lid 38 closes the inlet opening 17 again. This ensures that no burning fluid enters the drainpipe 6.

Since the hood 18 must first be lifted for draining the fluid by means of buoyancy, the flow of fluid from the fluid collection chamber 28 with respect to that in the Fig. 2 and 3 described slowed down and delayed. Therefore, the variant with the movably mounted hood 18 is also suitable for a downcomer 4, which has no sludge bucket 27 upstream of the fluid collection chamber 28 for throttling the amount of liquid supplied to the fluid collection chamber 28.

The inlet end 12 cross hood 18 also prevents coarse contaminants, such as branches or the like, between the cap 38 and the seal 40 are clamped and affect the sealing effect of the cap 38. The total of three wing nuts 21 allow easy disassembly of the hood 18 for maintenance purposes.

Fig. 6 shows a side wall 8 of a downcomer 4, in which in a mouth opening 10, a drain line 6 is fixed. Both Fig. 6 to 9 is in each case the drain line 11 into the fluid interior 28 continued to think so that its inlet end 12 extends with the hood 18 arranged thereon in the vertical direction 5.

Inside the drain line 6, a concentric annular space seal 15 is arranged, which is held by means of two executed as a bolted clamping plates in position at the end of the drain line 6. In this annulus seal 15, the drain pipe 11 is inserted with its discharge end 13 and fixed and held by the annulus seal 15. The annular space formed between the drain outside 14 of the drain pipe 11 and the inside of the drain line 11 is thus effectively sealed. By means of the annular space seal 15, a drain pipe 11 can be retrofitted with attached hood 18 in an existing downcomer.

Fig. 7 shows a bottom 9 of a downcomer 4 with an inserted into a mouth opening 10 in the bottom 9 drain line 6. From the fluid interior 28 of the downcomer 4 ago a drain pipe 11 is attached to the bottom 9. The attachment of the drain pipe 11 via a welded at its outlet end 13 on Ablaufrohraußenmantel 14 mounting flange 41. The mounting flange 41 is screwed by means of retaining dowels 42 to the bottom 9. In this case, a gap seal 43 is clamped between the mounting flange 41 and the bottom 9. Even with this embodiment, a drain pipe 11 with a hood 18 arranged thereon can be retrofitted in an easy way into an existing downcomer. The gap seal 43 prevents at the material transition between the bottom 9 and drain line 6 caused by capillary leakage currents along the outer jacket of the drain line. 6

Fig. 8 shows a side wall 8 of a downcomer 4, which is cast from concrete. The drain pipe 11 is poured into the side wall 8 and is held in a form-fitting manner by the surrounding side wall 8. In this case, the drain pipe 11 a circumferential wall ring 44 which is welded to the Ablaufrohrauraumantel 14. The wall ring 44 prevents leakage currents, which could otherwise leave the fluid collection chamber 28 at the transition between the Ablaufrohraußenmantel and the side wall 8 without being discharged through the drain line 6.

According to Fig. 9 For example, the side walls 8 and the bottom 9 of the downcomer 4 can also be made of a steel. Here, again, a stainless steel, such as V4A is suitable. In this case, the drain pipe 11 can be fixed in a simple manner in a recess introduced into the side wall 8 'by a weld seam along the outer jacket 14.

LIST OF REFERENCE NUMBERS

1

drainage system

2

longitudinal direction

3

gutter

4

downcomer

5

vertical direction

6

drain line

7

drain pipe

8,8 '

Side wall

9

ground

10

entry port

11

drain pipe

12

inlet end

13

expiring

13 '

outlet opening

14

Drain pipe outer sheath

15

Annulus seal

16

clamp

17

inlet opening

18

Hood

19

cover surface

20

retaining bolt

21

butterfly nut

22

Hood inner jacket

23

inside

24

opening edge

25

drain slit

26

recess

27

Silt bucket

28

Fluid collection space

29

pipe flange

30

radial direction

31

guide tab

32

bolt bracket

33

PCD

34

retaining tab

35

guide pins

36

guide sleeve

37

end stop

38

cap

40

poetry

41

mounting flange

42

dowels

43

gap seals

44

wall ring

Claims (12)

Drainage system (1) for a surface, road o. The like. With • a drainage pipe (7) and Several drainage pipes (4) opening into the drainage pipe (7),
marked by • a with its inlet end (12) perpendicular in the downcomer (4) projecting drain pipe (11) and A bell-shaped hood (18) covering the inlet opening (17) of the discharge pipe (11) and the region of the drain pipe outer casing (14) such that both between a partial region of the hood inner casing (22) and the drain pipe outer casing (14 ) as well as between the inside (23) of the top surface (19) of the hood (18) and the opening edge (24) of the inlet opening (17) has a flow gap (25) is released for the fluid to be discharged. Drainage system (1) according to claim 1,
characterized,
that the drain pipe (11) and the hood (18) are made of a heat-resistant material. Drainage system (1) according to claim 1 or 2,
marked by
a radially encircling outflow gap (25) between hood inner casing (22) and drainage outer casing (14) with preferably constant gap width. Drainage system (1) according to one of claims 1 to 3,
marked by
at the inlet end (12) of the drain pipe (11) vertically movably mounted hood (18) in its closed position with a hood inner shell (22) fastened cover (38) on the opening edge (24) of the drain pipe (11) rests and which in their opening position the flow gap (25) between the inside (23) of the top surface (22) and the opening edge (24) releases. Drainage system (1) according to one of claims 1 to 4,
marked by
a vertical, in the bottom (9) of the downcomer (4) opening outflow pipe (11). Drainage system (1) according to one of claims 1 to 5,
marked by
an angle-shaped, in a side wall (9) of the downcomer (4) opening outflow pipe (11). Drainage system (1) according to one of claims 5 or 6,
marked by
an annular space seal (15) sealing the annular space between the downpipe outer casing (14) in the region of the outlet opening (13 ') and the mouth into the bottom (9) or the side wall (8) of the downcomer (4). Drainage system (1) according to one of claims 5 to 7,
marked by
between the junction for the drain pipe (11) in the bottom (9) or in the side wall (8) and the Ablaufrohraumantel (14) mounted, the annular space seal (15) fixing clamping plates (16). Drainage system (1) according to one of claims 1 to 6,
marked by
one on the outlet opening (13 ') of the drain pipe (11) integrally formed, on the bottom (9) or the side wall (8) of the downcomer (4) aufschraubbaren mounting flange (41). Drainage system (1) according to claim 9,
marked by
a gap seal (43) arranged between the mounting flange (41) and the bottom (9) or the side wall (8) of the downcomer (4). Drainage system (1) according to one of claims 1 to 6,
marked by
a in the bottom (9) or the side wall (8) of the downcomer (4) embedded, preferably concreted outlet end (13) of the drain pipe (11) with a radially from the Ablaufrohrauraumantel (14) protruding wall ring (44) as a diffusion barrier. Drainage system (1) according to one of claims 1 to 11,
marked by
a drainage bucket (27) in the discharge shaft (4) upstream of the drainage pipe (11) in the direction of drainage.

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