Installation Manual - Rainwater Collection Systems
Contents
1. a ai i al F ME a r dn ie NTE A PRODUCTS ME Table of contents MNVOdUCHON nic 2 wi Range olappicalONs aneen a E N T 3 Product GOSGCHIDIION siisi a eaaa anaa lic 4 ZEN NOC EM CAN Dala sesia iaia 6 Z 2 TranSportatlon And Mounino orenean E A taba 8 Instructions for layout planning and execution of infiltration and retentions systems 9 del IMSMUCHONS TOR IAY OUE iste ell hill 9 3 2 Instructions for pre treatment of rainwater i 10 3 3 Instructions for inspection and cleaning devices i 11 3 4 Instructions for pipe installation and ventilation Of system i 12 Installation INSIFUCUONS nossen a a AA AE 15 4 1 Base layer and equalizing laye nosens helle a E A AR 15 4 2 Backfilling materials and backfilling of the tunnel system 15 4 2 1 Backfilling with non binding material 16 4 2 2 Backtilling with 16 32 mm g ravel la ia 17 4 3 Covering and load bearing capacity of the tunnel SystemM i 18 4 3 1 DRAINMAX Tunnel 60 with DIBt approval 18 4 3 2 Object specific calculation for special edge condition 18 4 4 Overview of construction with paved traffic areas as per RStO 01 eeccccseceeeeeeeeee ees 19 4 5 Load capacity during installation a a a a 20 4 6 Filler 222. e e e e o Fig 20 covering of the Filter fabric It is not necessary to directly cover the tunnel rows with filter on the tunnel rows fabric while backfilling it with 16 32 mm gravel Here the filter fabric is possibly used only as a separating layer to the final earth covering The tunnel bottom is generally covered with filter fabric or geocomposites flushing tunnel If pipes are directed through the filter fabric then the fabric is to be cut at the appropriate place with undersize so that the pipe can be tightly routed through the cuts Overlaps must be di rected with at least 50 The used filter fabric must fulfill following requirements Filter fabric sturdiness class GRK 5 Minimum width 2 5 m Stamping push through force 3500 N as per EN ISO 12236 Max tensile strength longitudinal diagonal 24 28 kN m as per EN ISO 10319 Max expension longitudinal diagonal 70 80 Opening width 0 06 mm Water permeability Viuso 36 I sm 22 4 7 Compound filter fabric at the base of flushing tunnel For applications in which it is possible to clean the base of the tunnel the INTEWA compound filter fabric GVS 500 is installed in the bottom area of the rows of flushing tunnels This later allows efficient cleansing of the sediments settled at the tunnel base The compound filter fabric has a non woven fabric on one side and mesh on the other The mesh is installed from top facing up The flushing tunnel rows are in
3. groundwater The load of underground water and above ground water can be evaluated qualitatively and quantitatively with the help of simple evaluation methods by rain water from roofs and traffic zones The appendix A toC of the ATV M153 allows a full and detailed assessment of pre cleaning measures Depending on the result and various measures for rainwater treatment a sufficient protection of water has to be ensured The INTEWA GmbH will gladly support you with planning and design al gt IN Ser _ Ar nre d 7 a P a Fig 6 Example Sedimentations slot and filter slot for cleaning rainwater 3 3 Instructions for inspection and cleaning devices You can inspect it fully due to the fully open half shell design of the tunnel element and if nec essary it can also be cleaned You just have to connect the row of flushing tunnel to a flushing chamber and inspection chamber From here you can direct a rotary swiveling camera or cleaning nozzle in the system and the dirt can be removed from the system Pa fi a ee g Flushing and inspection pit Fig 7 Camera inspection by the inspection pit entrance Due to well sized application of the preliminary sedimentation system usually a regular clean ing of the infiltration trench is not required However you can carry out clean in case of emer gency with appropriate precautionary measures such as arrangement and the number of flu
4. 4 7 Compound filter fabric at the base of flushing tunnel 23 Overview of installation StepS lai 24 SeNICE ll acilia 26 6 1 Inspeclion ana Mamienance assiali eil 26 2i iRCIGICNCeS dollari 27 6 3 Warranty and manufacturer s guarantees 27 1 Introduction Infiltration and attenuation of rain water has increasingly become the focus of public interest in past few years Floods falling ground water level as well as overloaded and outdated sewer systems in many regions has led to an increased importance of local water management sys tem Increasing environmental awareness of the natural infiltration of rainwater and economic con straints in many states has accordingly led to numerous government regulations and amend ments for local rainwater management e In NRW the state water law requires infiltration of rain water on the grounds of new buildings e n several countries and municipalities the subsequent installation of local water man agement systems is required e Ina large number of municipalities a fee has to be paid due to the sealed surface in or der to increase the incentive for local infiltration If a local infiltration rainwater is not possible then in several cases the temporary attenuation retention of rainwater is necessary in attenuation areas It is protected against overloading by means of a throttled discharge into the connecting drainage system or it is constructed with
5. 45MN m E Ballast substructure 120MN m F Bituminous base layer 150MN m G Binding layer H Covering layer P Total overlying ground Official German guidelines for the standardization of traffic surfaces 19 4 5 Load capacity during installation The open half shell structure is structurally loose without side and top backfilling By the defor mations due to high installation loads are avoided this way Usually the direct driving of the tunnel elements with construction vehicles or with consolidating devices is not allowed Consolidating device Height specification O to 50cm above ground level 50 to 120 cm above ground level from 40 cm above tunnel shoulder from 80 cm onwards above tunnel shoulder 1 vibrating plates Operating weight Plate width Vibrating force Vibrating frequency 2 Vibrating plates Operating weight Plate width Specific support pressure Vibrating force Vibrating frequency 3 e g Vibrating plates Operating weight Plate width Vibrating force Vibrating frequency 4 e g Vibrating plates Operating weight Plate width Vibrating force Vibrating frequency approx max 100 kg 380 mm x 500 mm 12 kN 85Hz approx 255 kg 600 mm x 800 mm 0 86 since N cm 35 kN 80Hz approx 400 kg 450 mm 59 kN 65Hz approx 760 kg 700 mm 100 kN 56Hz Tab 7 Consolidating device for backfilling from sides and top The c
6. a smaller size The advantages of local rainwater management for municipalities are e Reduced expenditure on flood protection flood prevention e lower costs in construction of drainage system the drainage rehabilitation and in using treatment plant e Less development of costs for new housing areas e Provision of basic water supply As manufacturers the INTEWA GmbH has specially developed the DRAINMAX tunnel system for infiltration attenuation and storage of rainwater The tunnel system built underground mini mizes the expenses for creation and operation of the rainwater management system Due to its flexibility the DRAINMAX tunnel system is used as a solution for drainage of rainwater rang ing from individual buildings to large commercial properties This documentation serves as the base for the production engineers and fabricators alike As long as the fabricator complies with the below mentioned installation guideline then maximum service life and safety of the system is guaranteed This documentation corresponds with the current state of technology but makes no claim to complete Technical changes are also reserved 1 1 Range of application The INTEWA DRAINMAX tunnel system is specially designed for underground infiltration attenuation and storage of rainwater The system can be used alike in small drainage tasks up to huge applications in commercial and industrial sectors Using the tunnel system for trench inf
7. be intro duced at the level of tunnel shoulder or tunnel bottom Ov Fig 9 Connection markings of the start and end section 12 The inflow into each row of tunnel is usually done at the pre cleaning fixure via an appropriately connected piping system In case of several rows the volume flow rate of inflow is equally dis tributed in all rows of tunnels YMILNI YMILNI VMILNI z E 3 3 3 gt gt gt VMILNI VMILNI VMILNI YMILNI VMILNI VMILNI Fig 10 Example for connected piping system to the preliminary sedimentation and filter pit If a flushing tunnel is used the water is distributed at the end of flushing tunnel row into parallel tunnel rows INTEWA GmbH Sedimentation l Flushing and filter pit and inspection pit VMILNI VMILNI XVN NIVEO VMI INI Spultunnel VMILNI WMILNI WMILNI i VMILNI VMILNI WMILNI Filter fabric base at row of flushing tunnel x W Fig 11 Example for inflow connection of the parallel tunnel rows by using a flushing tunnel 13 The variations in air pressure caused in the tunnel system by inflow and discharge of the water must be balanced by ventilation The size of vent is based on the maximum volume flow rate of inflow A venting connection is provided in DN100 depending on the inflow amount 20 1 s The venting connection from tunnel is done from the centre of tunnel dome or fro
8. ab 5 Construction layers with backfilling using 16 32 gravel 17 4 3 Covering and load bearing capacity of the tunnel system The load bearing capacity of the installed tunnel system is in addition to the bearing capacity of the contact patch de pends on the backfilling materials on sides the degree of consolidation as well as the entire covering height P The better the consolidation that much better will be the load transfer The greater the traffic load the greater the distribution of load by an appropriately specified construc tion height The following table mentions the load bearing capacity The entire cover P above tunnel shoulder is to be maintained depending on the traffic load regardless of the type of su Fig 16 Total overlying ground P perstructure and road surface 4 3 1 DRAINMAX Tunnel 60 with DIBt approval Possible total overlying Accessible gravel surface tte 0 50 3 00 m 12 t Lorry sateen alternative surface load 6 7 kN m gravel surface l i l Heavy goods vehicle HGV 30 _ alternative surface load 16 7 kN m paved surface ee 1 00 2 00 m Heavy goods vehicle HGV60 E _ surface load 33 4 kN m paved surface 20 0 t 1 00 1 65 m Valid only if the installation range is reported as frost proof The formation of lane grooves has to be considered at unhitched areas The minimum total cover may not be ex ceeded Tab 6 Overview of the allowed total overlying ground T
9. ding ground soil due to the vault shaped design of the INTEWA DRAINMAX tunnel The prerequisite load bearing capacity is the loading of tunnel body on to the ground by backfilling sides The DRAINMAX tunnel can be used below traffic zone with heavy load up to SLW60 depend ing on the type of backfilling gravel or consolidated soil material and the amount of cover The height above ground can be lie within the range from 50 to 200 cm above the tunnel shoulder Chap 4 6 The water is uniformly divided and infiltrated in the ground without any obstructions by means of the completely open interior of the tunnel The boring rows on both sides for two height levels ensure infiltration even from the potentially necessary infiltration from sides The INTEWA DRAINMAX system elements are Start section with 4 cm small connecting serrations Central tunnel on one side with an 8 cm wide connecting serration and on the other side with a 4 cm small connecting serration End section with an 8 cm wide connecting serration End section DRAINMAX T100E 60 Middle tunnel DRAINMAX T1600M 60 Connection markings Start section DRAINMAX T100S 60 Air vent connection Cai oS SS Fig 4 DRAINMAX Tunnel The INTEWA DRAINMAX tunnel elements are manually laid in rows A distance of 450 mm must be maintained with a parallel installation of rows The elements of start section the middle tunnel and the end section are added together in a r
10. ection effective used length 2250 mm Weight 32 kg 5 5 kg 5 6 kg 1 x DN100 Dome DN100 300 DN100 300 Approved processing temperature 2 to 30 C 2 to 30 C 2 to 30 C Tab 1 Technical data of the DRAINMAX tunnel elements _ CEI a i Fig 5 Dimensions of the DRAINMAX tunnel elements and connetion markings 2 2 Transportation and mounting The elements of DRAINMAX Tunnel are packed on pallets or delivered as packaged goods to the site There on site they are unloaded manually lifting truck or other lifting aids The starts section and end section generally transported below the middle tunnels re cpl F Fang e r Falce pi Fl gt ng gr i e 4 Image 1 Pallet transportation of the Tunnel elements Image 2 Lifting the elements The temporary storage must be done onthe special delivery pallets With risk of high winds the piled tunnel elements must be secured with straps The DRAINMAX Tunnel canbe stored outdoors But then you have to protect them from di rect sunlight and heat by using a bright opaque covering The storage time should not exceed one year The tunnel elements may be damaged due to inappropriate handling The impact load is to be avoided particularly in cold weather Palett Lorry 40 t 45 FT HC Container Trailer truck Ocean fright max Number of pieces 20 Tunnel 1 palett 180 Tunnel 9 pallets 225 Tunnel 9 paletts Loading weigh
11. ed fixed surfaces Calculating the amount of inflow as well as infiltration and attenuation system Calculation of infiltration runoff the runoff with attenuation system will be firmly defined by the specified throttle runoff value iterative determination of the required storage volume depending on the local rain fall and frequency of overflow events Assessment and selection of the most economical system design Specifying the design The number of tunnel and arrangement type of backfilling mate rial If necessary determining the pre cleaning measures flushing and inspection cham bers mounting material etc The INTEWA GmbH will gladly support you with planning and design This also includes sup port for hydraulic proof by software supported simulation 3 2 Instructions for pre treatment of rainwater The water supplied by DRAINMAX system requires a sedimentation and filtration in order to ensure the proper functioning of the infiltration system or the attenuation system Regular inspections maintenance and cleaning by this pre treatment fixtures ensure a smooth operation of the tunnel system primarily with respect to a uniform infiltration performance and the protection of the throttle device with the attenuation systems For infiltration systems the sizing and selection of water pre treatment fixtures also emphasises more on the expected concentration of material and thereby if necessary associated hazards of
12. el 6 Service 6 1 Inspection and Maintenance The upstreamed rainwater cleaning systems are to be regularly maintained and cleaned You can obtain details on maintenance of INTEWA sedimentation and filter pits at www intewa de One advantage of the DRAINMAX tunnel system is its open hollow structure You can com pletely inspect and flush the bottom and wall of the tunnel by suitable connection pipe which are both critical for long term infiltration performance The infiltration capacity can be recorded and examined by measuring the change in water level If the infiltration capacity deviates more than 25 of the output then the cause has to be de termined by a camera inspection for example the thickness of sedimentation has to be checked The area of flushing tunnel can be cleaned and the sediments can also be removed by using the high pressure cleaning procedure consisting of jet nozzle Local drainage clean ing companies have the necessary equipment for extraction rinsing and cleaning this You can find detailed information on the inspection maintenance and remote monitoring system at www intewa de Image 14 Image Drainage cleaning system Image 15 High pressure cleaning The throttle system has to be checked for free movement and permeability with attenuation systems You can find detailed information on INTEWA products at www intewa de 26 6 2 References The INTEWA DRAINMAX tunnel is extremely popular in the c
13. he per meability mentioned in plan specifications A separating layer of filter fabric is used installed at ground level and at embankment of construction pit when using 16 32 mm gravel as backfilling material When the backfilling material is non cohesive the tun nel has to be covered all over with filter fabric The filter fabric is placed under the row of tunnel The ground level is to be created with examination of the load baring capacity as mentioned in the plan specifications Laying the tunnel elements and establishing pipe connections Before the tunnel is laid the inflow and inspection pits must be installed at the appropriate position and height and the tunnel bottom must be strengthened by filter fabric Place the DRAINMAX elements on the prepared ground in rows with placed filter fabric The first tunnel is laid down starting from the intake pit with start section The elements are connected with each other by overlapping The end cap closes the tunnel row After this place the next row parallel as per the distance specified in the layout plan 24 Image 6 dyn Plate load test at ground level i Image 9 Form lock fixing of two tun nel elements by overlapping Cover rows of tunnel with filter fabric and ar range it in such a way that the fabric can adapt to the serrations when covered with soil Avoid overstretched fabric at cavities If using 16 32 gravel the rows of tu
14. iltration The rainwater infiltration allows infiltration of rain water at source Some of the advantages of infiltration are e The rainwater is recycled back into the natu ral water cycle e Decoupling from the drainage system and thereby exemption from the fee due to seal ing charged in several places Using the tunnel system for pit trench infiltra tion As a general rule the combination of pit infiltration and trench infiltration is done when e an infiltration is required by the so called busy ground zone e the space required for a commercial pit has to be minimized Using the tunnel system for rainwater attenua tion With attenuation the rain water is temporarily stored in the tunnel system and is throttled via a special drainage device to the drainage system Reasons for attenuation may include e Connecting additional sealed surfaces to existing drainage systems e Municipality order for example if the local soil conditions do not allow infiltration e Reduction ofpeak drainage flows in the drainage system during heavy rainfalls Fig 2 Pit trench infiltration fe a Fig 3 Rainwater attenuation 2 Product description The INTEWA DRAINMAX system elements are designed for underground installation The rainwater is directed into the created underground storage reservoir for infiltration or temporary storage The load of earth and transportation is directed into the surroun
15. l must at least correspond with the permeability as specified in the plan 4 2 Backfilling materials and backfilling of the tunnel system The tunnel system can be backfilled with a permeable non binding and consolidating soild ma terial up to 16 32 mm gravel depending on the required load bearing capacity of the entire sys tem Generally the tunnel system can be loaded with a consolidated backfilling with at the highest Regardless of the backfilling material the backfilling is even and on both sides in layers of 20 cm One sided backfilling is not permitted since this can lead ti deformation of the tunnel structure and minimizes the capacity of the system i a 33 fi BSA ME Fig 13 not permitted one sided backfilling 15 4 2 1 Backfilling with non binding material If the backfilling is to be done with non binding backfilling material with fells then the tunnel elements must be directly covered with a GRK 5 filter fabric in order to prevent the penetration of fells into the infiltration holes on sides The minimum cover above the tunnel shoulder is specified as fixed 35 cm Hereby the load bearing capacity Evz 45MN m required for track superstructure as per RSTO 01 is to be es tablished The backfilling from sides and top occurs in layers with max 20 cm with appropriate consolida tion The compacting requirements of ZTV E StB 09 are to be observed under traffic zones ower traffic areas of compaction req
16. m the top of section connection The air is transferred outside via a vent of air to the outside via a ventilated pit such as sedimentation pit or flushing and inspection pit Ventilation LD Fig 12 Example for venting possibility Flushing and inspection pit 14 4 Installation instructions The professional installation of the tunnel elements is a prerequisite for proper functioning and long service life of the entire system This affects the entire construction phases right from the preparation of plan to backfilling up till the covering of the tunnel system 4 1 Base layer and equalizing layer The load bearing capacity of the existing soil is necessary for obtaining the stability of the tun nel system If there is lack of Knowledge or doubt related to the load bearing capacity of the soil then a special investigation is necessary by a Geotechnical Engineer If the load bearing capacity of natural soil is not sufficient then if necessary the required load bearing capacity can be established by advanced measures for example gravel base layer filter fabric in sert etc A non binding consolidating soil material may be used as a base layer cannot cohesive com pressible soil material can be used up till gravels with a grain size up to 16 32 mm The contact patch of the tunnel must indicate a load bearing capacity of at least E 2 45 MN m For infiltration purposes the permeability of the consolidated underground soi
17. nnel are not required to be covered directly Secure foot embankment with soil in order to fix filter fabric Backfilling of tunnel elements from sides The tunnel element is backfilled from both sides and top with suitable backfilling material in uniform layers of maximum 20 cm The uniform compacting of backfilling layers is done with light consolidating device With in creasing altitude heavy consolidating devices may be used see Chapter 4 4 Covering the tunnel elements The load bearing capacity for connected road su perstructures is to be taken into account while convering the tunnel elements The backfilling material with mixed grading curve is consolidated in layers above the tunnel shoulder up till the required load bearing capac ity is obtained When using 16 32 mm gravel it is backfilled up to 10 cm above the tunnel shoulder backfilled and is covered flat with a separate layer of filter fabric The filter fabric is beaten down from all sides at least 50 cm overlapping It is further backfilled and compacted in layers with non binding soil material till the required capacity of 45 kN m is attained Superstructure for paved road surfaces Finally the superstructure is created for the road surfaces as per plan specifications 25 Image 10 Covering with filter fabric dol Image 11 Backfilling filter fabric for fixing Image 12 Compacting with a small compact ing device between rows of tunn
18. ompression may only be done with plane vibratory plates Vibrating tamper and vibratory rollers are not permitted 20 Height specifications Construction vehicle starting from 40 cm com Crawler exacavtor pacted covering on tunnel Total weight max 20 t PAGUAR Spare distributed load lt 5 KN m starting from 60 cm com Wheeled vehicle pacted covering on tunnel with max Wheel load of 4 t that may not exc by dumping Spare distributed load max 6 7 KN m shoulder Starting from 80 cm com Wheeled vehicle pacted covering on tunnel shoulder with max Wheel load of 6 5 t that may not exceed by dumping Spare distributed load max 16 7 KN m Tab 8 Permitted load of construction vehicle during tunnel installation LE on cm ll Fim Lusi nin a 80 cm Fig 19 Overview of construction machines and vehicle 21 4 6 Filter fabric The filter fabric is used whenever there is a risk of fells enter ing into the tunnel Filter fabric When backfilling with non cohesive material then the tunnels are to be covered with filter fabric An oversized filter fabric must be placed on the tunnel rows so that it can follow the serrated structure and could be filled completely with soil in serrated area during backfilling The overstretching of filter fabric is to be avoided in cavities The fabric must have a minimum width of 2 5 m for direct covering of tunnel gt
19. ountry as well as abroad with more than 25 000 installed m You can refer a number of references at www intewa de Image 16 References 6 3 Warranty and manufacturer s guarantees This user manual represents the intended use and describes the underground installation of DRAINMAX tunnel If used other than the intended purpose as well as in conditions other than mounting and basic use especially different filling material then they are not covered by this structural analysis The general business terms and conditions for the INTEWA manufacturer s guarantee can be found at www intewa de 21 INTEWA GmbH Version 2 0a Subject to technical changes
20. ow and a closed system is provided by the connecting serrations overlapping and fitting each other with face up position The connecting pipes for water intake and discharge as well as for evacuating the air are in stalled at the start and end section of the tunnel row You can install a pipeline connection rang ing from DN100 to DN300 in both lower and upper region The DRAINMAX tunnel elements must be installed as per the installation guidelines mentioned below The DRAINMAX tunnel elements are then laid for a service life of 50 years with respect to their material characteristics and their scope of use The installation varieties other than these need a separate structural calculation The elements are made from polyethylene PE HD with cupping process This technical plas tic is resistant to chemicals and microorganisms and thus does not rot The variety of pure plas tic is also 100 recyclable The tunnel elements may not be committed from within The following installation guidelines are crucial for installation The tunnel elements may not run over by site vehicles just after a consolidated minimum covering The specific planning specifications are to be observed 2 1 Technical Data Middle tunnel Start section End section DRAINMAX parts DM T 1600 M 60 DM T 100 S 60 DM T 100 E 60 Length 2340 mm 443 mm 444 mm Width 1375 mm 1375 mm 1375 mm Height corrugated shoulder 736 mm Height Dome conn
21. r through the side holes In order to prevent the sub merging of surrounding soil into the gravel bed it is necessary to cover it with filter fabric from all sides For obtaining the required load bearing capacity of Ey2 45MN m a consolidated layer of at least 25 cm must be introduced with non binding and consolidated material on 10 cm tunnel cover A plane intermediate layer of filter fabric protects the gravel bed from penetration of fells Superstructure Trafficzone E 45 MN m v De 45 cm MIN Notice The allowed minimal and maximum height D is addicted by the installation situation and traffic load Chap 4 3 Fig 15 Construction layers with tunnel backfilling using 16 32 gravel SLW30 congestion The backfilling material as well the required load bearing capacities of the construction layer are to be referred from the following table Construction layer Materia Load bearing capacity Base and equaliizing Non binding consolidating material min Eva 45MN m layer As per DIN 18196 Dpr 2 97 Tunnel backfilling from sides and top ede Dor 2 97 16 32 mm gravel 2 10cm As per DIN 18196 With loose surfaces such as pit trench infiltration Tunnel covering Ground with permeability requirements as per DWA A138 K gt 1x10 m s Low consolidating installation max Dpr 92 With firm surfaces Tunnel covering ai a Dor 2 97 gt 25 cm Non binding consolidating material min Ey 45MN M T
22. raffic loads according to DIN 1072 with special manufacturing 4 3 2 Object specific calculation for special edge condition This user guideline describes the relevant standard Dose fer ised installation conditions The installation and edge s i 7 T_T conditions different from it are not covered by the ex isting structural standards SEFA Be E Ei The INTEWA GmbH will be glad to assist you with the _ project related 3D FEM simulation by means of ob 5 ject specific structural standards i Fig 17 Determining the installation depth 18 4 4 Overview of construction with paved traffic areas as per RStO 01 The DRAINMAX Tunnel is approved for installation under parking areas including heavy traf fic This corresponds to the classification of construction class BK V according to RStO 01 The traffic surface can be made in asphalt concrete or plaster The segmentation in structural level can be determined on the basis of construction class type of traffic load depending on the type and thickness The load bearing capacities of the structural layers are defined by re spectively associated deformation Evz Superstructure Traffic zone Base layer with DRAINMAX tunnel Fig 18 Example of base layer superstructure with bituminous cover in accordance with RStO classification V Line 3 1 A Sustainable ground layer B Filling for instance with gravel 16 32 mm C Tunnel covering 45MN m D Anti freeze layer
23. sh ing and inspections chambers as well as the special layout of the flushing tunnel row are to be taken into consideration in the planning phase Generally cleaning is done only when it is recommended in an inspection report that too much sedimentation has been deposited or if the infiltration capacity is reduced significantly High pressure hose y 4 Suction lance aes Flushing and inspection pit Fig 8 Cleaning and slime removal via flushing and inspection pit 11 Then the bottom of the tunnel is cleaned by means of a high pressure cleaning nozzle in the tunnel row deployed as the flushing tunnel The cleaning nozzle of the flushing truck is directed towards the flushing and inspection pit in the flushing tunnel The reverse jet of the cleaning nozzle cleans the sedimentation settled at the bottom of the flushing pit and inspection cham ber which is from here sucked through suction lance Several cleaning and rinsing cycles may be required depending upon the dirt Fa ae ee a Image 3 Flushing nozzle with reverse conical jets Image 4 Flushing nozzle with cleaning procedure 3 4 Instructions for pipe installation and ventilation of system The pipes are connected as per the spec ifications in plan from the head end of the tunnel to the start and end sections The pipe connection markings at the tunnel section allow on site cutting by means of a sabre saw The inlet pipe of the rainwa ter into the tunnel system can
24. stalled on the mesh side The backfilling of tunnel system is done with fell or gravel from sides as described The compound filter fabric is laid in the channel within the flushing tunnel There must be no overlappings The compound filter fabric must extend to at least 300 mm on the sides in order to be appropriately clamped in the soil The adjacent tunnels must maintain an appropriate dis tance CA LX NANI LE SLI Flushing bottom with compound filter fabric Fig 21 Compound filter fabric in bottom area of the flushing tunnel The used compound filter fabric must fulfill following requirements Filter fabric sturdiness class GRK 5 Minimum width 2m Stamping push through force 6500 N as per EN ISO 12236 Max tensile strength longitudinal diagonal 45 45 KN m as per EN ISO 10319 Max tensile strength expansion longitudinal diagonal 717 Opening width 0 08 mm Water permeability Vlyso 7 5 mm s 23 5 Overview of installation steps Construction pit and ground level The construction put is to be created as specified in the plan In doing so the DIN 18300 Groundwork opera tions DIN 4124 construction pits and ditches em bankments pit lining and if necessary DIN 4123 building security within the scope of excavation are to be observed Establishing a horizontal even and stable base layer for infiltration purposes the permeability of the com pacted subsoil must at least correspond with t
25. t 690 k 6210 k 7650 k of max Number of pieces Gross storage volume 32 m3 288 m 360 m without sections In maximum 5 start and 5 end sections can packed together with each pallet Tab 2 Transportation dimensions and weight of DRAINMAX Tunnels 3 Instructions for layout planning and execution of infiltration and re tentions systems The knowledge of local geological and hydrological conditions which can be examined by ex perts must be known The infiltration area has to be examined with respect to the type of soil ground water condition even in terms of increased ground water as a result of infiltration as well as permeability and stability by the Geotechnical Engineer especially with infiltration sys tems Moreover following legal regulations and technical directives have to be observed for the con struction of rainwater management systems Legal regulations Technical directives EU law Work Sheet DWA A 138 Federal law ATV DVWK M 153 Federal State Law DWA A117 A118 A121 A128 Municipal Statutory Law KOSTRA Various standards including DIN4261 1 EN 752 Tab 3 Overview of legal regulations and technical directives Technical and construction restrictions related to drainage water technology are to be inquired to the responsible authorities 3 1 Instructions for layout The layout of the rainwater management systems usually includes the steps listed below Inventory control and assessment of the connect
26. uirements are noted ZTV E StB 09 Superstructure Trafficzone E 45 MN m 35 cm MIN 45cm MIN Notice The allowed minimal and maximum height D is addicted by the installation situation and traffic load Chap 4 3 Fig 14 backfilling with non binding consolidating soil material SLW30 congestion The backfilling material as well the required load bearing capacities of the construction layer are to be referred from the following table Construction layer Load bearing capacity Dpr gt 97 Base and equaliizing Non binding consolidating material with min Ey 45MN m2 soil class 3 and 4 as per DIN 18196 Non binding consolidating material as per DIN 18196 Dpr 2 97 consolidation of up to 20 cm each Backfilling of tunnel from sides and top Non binding consolidating material Tunnel covering as per DIN 18196 consolidation of up to 20 cm each Dpr 2 97 min Eyo 45MN m Tab 4 Construction layers with backfilling tunnel using non binding material 16 4 2 2 Backfilling with 16 32 mm gravel The backfilling with gravel is a kind of construction for creating additional infiltration volume by void proportion of the gravel The characteristics related to installation of filter fabric and estab lishing traceable load bearing capacity is to be observed with backfilling The direct covering of tunnel rows with filter fabric is not mandatory with 16 32 mm gravel since as this size of particles cannot ente
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