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DIEL AND MILOCHOV RAILWAY TUNNELSDiel Tunnel

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73 29. ročník - č. 2/2020

DIEL AND MILOCHOV RAILWAY TUNNELS

Diel Tunnel

The Diel tunnel (see Fig. 6) passes through the Diel hill massif, which forms the central part of the Váh River meander in the area of the Nosice dam. The tunnel design length amounts to 1082 metres. The tunnel is being driven through the massif under the Nimnica spa. The western portal is located on the outskirts of the municipality of Nimnica; the eastern portal (see Fig. 6) is being constructed in the area above the II/507 secondary road leading from Púchov to Považská Bystrica along the right bank of the reservoir. The Diel tunnel escape gallery has been broken through. It has its exit in the area of the eastern portal of the tunnel.

On 26th March 2020, concreting of the secondary lining of the Diel tunnel was fi nished. The portal block of the escape gallery was carried out last. All cable ducts and walkways have been fi nished. The work on cleaning the drainage system is underway and day joints and expansion joints are being sealed. The civil part of the tunnel is prepared for installation of tunnel equipment.

Among the fi rst operations, holes were drilled for fi xing the catenary to the tunnel vault. The fi re water distribution system has been completed. Pulling of fi rst power cables into cable ducts has started.

In the escape gallery (see Fig. 7), dividing walls are being carried out for the ventilation chamber located at the beginning of the gallery and for a fi re-check door between the escape gallery and the tunnel.

At the western portal of the tunnel, a service house is under construction. It will house centres for all equipment needed for the tunnel operation. The automatic water pressure booster pump station is one of the most complex ones. It will ensure functionality of the fi re water supply system during an emergency situation. The work on fi nal fi nishes in the form of a reinforced slope above the cut-and-cover tunnel and cladding gabions fi lled with aggregate is underway in the surroundings of the house and the tunnel portal itself.

A reinforced concrete frame of the service house with a smaller ground plan area than that at the west was built at the eastern portal.

Work on the fi nal terrain fi nishes began in the surroundings of the end of the escape gallery and the tunnel itself.

First train should pass through the tunnel at the end of September.

ŽELEZNIČNÉ TUNELY DIEL A MILOCHOV

Tunel Diel

Tunel Diel (obr. 6) prechádza masívom vrchu Diel, ktorý tvorí centrálnu časť meandru Váhu v oblasti Nosickej priehrady. Tunel je navrhnutý dĺžky 1082 m. Razenie tunela prebiehalo v masíve popod kúpele Nimnica. Západný portál je situovaný na okraji obce Nimnica, východný portál sa realizuje v území lesa nad cestou dru- hej triedy II/507, ktorá vedie z Púchova do Považskej Bystrice po pravom brehu priehrady. Tunel Diel má prerazenú únikovú štôlňu, ktorá ústí do priestoru východného portálu tunela.

Dňom 26. 3. 2020 sa na stavbe tunela Diel skončili betonárske práce na sekundárnom ostení. Ako posledný sa zhotovil portálový blok únikovej štôlne. Zhotovené sú všetky káblovody a chodníky.

Prebiehajú čistiace práce odvodňovacej sústavy a tmelia sa pra- covné a dilatačné škáry. Stavebne je tunel pripravený na montáž technologického vybavenia. Medzi prvými prácami sa realizovali vrty pre konzoly na uchytenie trakčného vedenia do klenby tunela a rozvod požiarneho vodovodu. V káblovodoch sa začali zaťahovať prvé silové káble.

V únikovej štôlni (obr. 7) sa realizujú priečky pre vzduchotech- nickú komoru, ktorá je situovaná na začiatku štôlne od východného portálu a priečka pre požiarne dvere medzi únikovou štôlňou a tu- nelovou rúrou.

Na západnom portáli tunela sa buduje technologický domček, v ktorom budú umiestnené centrály pre všetku potrebnú techno- lógiu na prevádzku tunela. Jednou z najzložitejších je automatická tlaková stanica (ATS), ktorá bude zabezpečovať funkčnosť požiar- neho vodovou pri havarijnej situácii. Okolo domčeka a samotného portálu tunela prebiehajú práce na konečných terénnych úpravách v podobe vystuženého svahu nad hĺbeným tunelom a obkladových gabiónov plnených sypaným kamenivom.

Obr. 6 Konečné terénne úpravy – západný portál, tunel Diel Fig. 6 Final terrain fi nishes at the WP of the Diel tunnel

Obr. 7 Úniková štôlňa tunela Diel Fig. 7 Escape gallery of the Diel tunnel

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74

29. ročník - č. 2/2020

Milochov tunnel

The new Milochov tunnel is designed for overcoming the bottom of Stavná hill south of the municipal district of Horný Milochov of the town of Považská Bystrica. The tunnel length design amounts to 1861 metres. The tunnel will have one escape gallery ending in the municipality of Horný Milochov.

The excavation from the western portal has been fi nished.

Excavation of 115 metres in the top heading and 105 metres of full-face excavation has been fi nished.

Excavation from the western portal continues by working at two levels, the top heading and bench with the bottom, so that the distance between them prescribed by the design for each excavation support classs is not exceeded. As of today (8th April 2020), excavation of 1335m in the top heading, respectively 1260m in the bench has been fi nished. The excavation has been suspended since 15th March 2020 for the reason of restriction because of spreading of COVID-19 and using workers from the CR. It is possible that the tunnel breakthrough, which was expected in July 2020, will be postponed.

The escape gallery is being driven upward from the tunnel interior. The work is carried out in excavation support class II and, as of today, 178 metres of the total length of 266.4 metres have been fi nished.

At the eastern portal of the tunnel the work proceeds on foundation of the cut-and-cover part (see Fig. 8), which consists of seven 10 metres long blocks. Non-bearing sub-base is being removed and is being replaced by concrete foundation, on which the vault of the cut-and-cover tunnel will subsequently be carried out using a false primary lining.

The whole construction is carried out by the Nimnica consortium consisting of the companies of Doprastav – TSS Grade – SUBTERRA – EŽ Praha. The Diel tunnel is carried out by the company of TUBAU, a.s. and the Milochov tunnel by the company of Subterra a.s. The general designer for Železnice Slovenskej Republiky (Slovak Railways) is the company of REMING CONSULT a.s.

Ing. JÁN KUŠNÍR, REMING CONSULT a.s.

Na východnom portáli bol postavený železobetónový skelet technologického domčeka s menšou pôdorysnou plochou ako na západe. Rozbehli sa práce na konečných terénnych úpravách v okolí vyústenia únikovej štôlne aj samotného tunela.

Koncom septembra tohto roku by tunelom mal prejsť prvý vlak.

Tunel Milochov

Na preklenutie úpätia vrchu Stavná, južne od miestnej časti Hor- ný Milochov mesta Považská Bystrica, je navrhnutý nový tunel Milochov. Projektovaná dĺžka tunela je 1861 metrov. Tunel bude mať jednu únikovú štôlňu, ktorá bude vyúsťovať v obci Horný Mi- lochov.

Raziace práce zo západného portálu sú ukončené. Vyrazených je 115 metrov v kalote a na celý profi l tunela 105 metrov.

Razenie z východného portálu pokračuje prácami v dvoch úrov- niach, v kalote a stupni s dnom tak, aby sa od seba nevzdialili na predpísanú vzdialenosť určenú projektom pre každú vystrojovaciu triedu. Ku dňu 8. 4. 2020 bolo v kalote vyrazených 1335 metrov a v stupni, resp. dne 1260 metrov. Raziace práce boli z dôvodu ob- medzenia pre šírenie COVID-19 a využívania pracovníkov z ČR od 15. 3. 2020 prerušené. Je možné, že prerážka tunela, ktorá bola odhadovaná na júl tohto roka, sa posunie.

Zvnútra tunela sa razí dovrchne úniková štôlňa. Práce prebie- hajú vo vystrojovacej triede II, a a ku dňu 8. 4. 2020 je vyrazených 178 m, z celkovej dĺžky 266,4 m.

Na východnom portáli tunela prebiehajú práce na zakladaní hĺbenej časti (obr. 8) , ktorá sa skladá so siedmich 10metrových blokov. Odstraňuje sa neúnosné podložie a nahrádza sa betónovým základom, na ktorom sa následne pomocou falošného primárneho ostenia zhotoví klenba hĺbeného tunela.

Celú stavbu realizuje združenie Nimnica zložené zo spoločností Doprastav – TSS Grade – SUBTERRA – EŽ Praha. Tunel Diel realizuje spoločnosť TUBAU, a.s. a tunel Milochov spoločnosť Subterra a.s. Generálnym projektantom pre investora Železnice Slovenskej republiky je spoločnosť REMING CONSULT a.s.

Ing. JÁN KUŠNÍR, REMING CONSULT a.s.

Obr. 8 Zakladanie hĺbeného tunela VP tunela – východný portál, Milochov Fig. 8 Foundation of the cut-and-cover tunnel at the EP of the Milochov tunnel

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