This thesis deals with the technical-economic feasibility study of a cableway connection between the localities of Tresenda, in the Province of Sondrio, and Aprica, a renowned winter tourist resort. The objective of the paper, in addition to mere planning, is the development of a calculation programme and analysis methodology that can be replicated for other Alpine resorts. The municipality of Aprica has always been a place of transit for goods and travellers coming from Trentino via the Tonale Pass and heading to Valtellina and Lake Como, and it is also a popular winter resort that, due to the large number of tourists, is burdened with a large number of cars. The aim of the project is to relieve the resort of traffic. Following a geographical analysis, the only option is the construction of a cable car from the Valtellina side. The feasibility study from a technical point of view presents a bi-univocal correspondence with the economic-financial study: the choice of the type of installation is influenced by the costs and revenues, which are in turn a function of the speed and waiting times. Since it was not possible to realistically analyse every type of installation and its relative costs - earnings, a skimming was therefore carried out based on experience, deciding to continue the study with only the ‘monocable - bicable - tri-cable’ types. An SP investigation was carried out comparing private transport, varying by two attributes on two levels, with cable car transport, varying by three attributes on three levels, for a total of 108 scenarios. The objective of the investigation is to calibrate the log-binomial formula by iteratively maximising the log-likelihood equation. The equation provides the probability of choosing a solution as a function of attribute variation. An analysis of the potential demand for seasonal or annual use was also performed, from which the number of potential users is found by multiplying it by the probability of choice. In addition, the ticket price from which the revenue is derived. Overall, after estimating the construction and operating costs, the chosen installation is the single-cable detachable gondola. The line calculation consists of designing the profile of the entire line of the installation by positioning the supports and stations according to the terrain profile and loads. The first step is a pre-dimensioning from which, iteratively, the upstream tension is calculated as a function of the rope diameter. Since line calculation is an iterative and repetitive procedure, I set up a Microsoft Excel spreadsheet to automate the various operations: starting with the values of the downstream rope pull, length and height difference of the span to be calculated, it estimates the load on the downstream support from which follow the rope angles and the arrow, calculated using the catenary formula. Once the span has been calculated, the calculation is automatically repeated six times, and you can move on to the next sheet by entering the length and height difference values of the next span and so on. Following the actual calculation, the main verifications required by the reference standard are also entered in the sheet. The calculation was then further verified by considering all intermediate load configurations with only partially loaded vehicles. The system was found to be technically feasible and economically viable.
La Tesi oggetto del presente elaborato verte sullo studio di fattibilità tecnico – economica di un collegamento via fune tra le località di Tresenda, in Provincia di Sondrio, e Aprica, rinomata stazione turistica invernale. L’obbiettivo cui si prefigge l’elaborato, oltreché la mera progettazione, è lo sviluppo di un programma di calcolo e di una metodologia di analisi da poter replicare anche per altre località alpine. Il comune di Aprica è da sempre luogo di transito per merci e viaggiatori provenienti dal Trentino via Passo del Tonale e diretti in Valtellina e Lago di Como, inoltre si tratta di una rinomata località invernale che, a causa del gran numero di turisti, risulta oppressa da un numero elevato di automobili. Lo scopo del progetto è quello di sgravare la località dalla presenza di traffico: a seguito di un’analisi geografica, l’unica opzione è la costruzione di un mezzo via fune dal versante valtellinese. Lo studio di fattibilità dal punto di vista tecnico presenta una corrispondenza biunivoca con lo studio economico – finanziario: la scelta della tipologia di impianto è influenzata dai costi e dai ricavi, i quali sono a loro volta funzione della velocità e dei tempi di attesa, a loro volta funzione della tipologia di impianto. Non potendo realisticamente analizzare ogni tipologia di impianto e relativi costi – guadagni, è stata quindi effettuata una scrematura basandosi sull’esperienza, decretando di proseguire lo studio con le sole tipologie “cabinovia monofune – bifune – trifune”. È stata effettuata un’indagine SP comparando il trasporto privato, che oscilla tramite due attributi su due livelli, con il trasporto funiviario, facendo variare tre attributi su tre livelli, per un totale di 108 scenari. L’obbiettivo dell’indagine è quello di calibrare la formula del Log-binomiale iterativamente massimizzando a mezzo di elaboratore l’equazione della log-verosomiglianza. L’equazione fornisce la probabilità di scelta di una soluzione in funzione della variazione degli attributi. È stata, inoltre, eseguita un’analisi della domanda potenziale per un utilizzo stagionale ovvero annuale da cui, moltiplicandola per la probabilità di scelta, si trova il numero di utenti potenziali. Si ricava, inoltre, il prezzo del biglietto da cui gli introiti. Complessivamente, a valle di una stima sui costi di costruzione e gestione, l’impianto scelto è la telecabina monofune ad ammorsamento automatico. Il calcolo di linea consiste nella progettazione del profilo di tutta la linea dell’impianto posizionando i sostegni e le stazioni in funzione del profilo del terreno e dei carichi. Il primo passo è un predimensionamento da cui, iterativamente, si calcola il tiro a monte in funzione del diametro della fune. Essendo il calcolo di linea un procedimento iterativo e ripetitivo, ho impostato un foglio di calcolo Microsoft Excel così da automatizzarne le varie operazioni: partendo dai valori di tiro della fune a valle, lunghezza e dislivello della campata da calcolare, stima il carico sul sostegno di valle da cui seguono gli angoli della fune e la freccia, calcolati tramite la formula della catenaria. Calcolata la campata, ripetuto automaticamente il calcolo per 6 volte, si può passare al foglio successivo inserendo i valori di lunghezza e dislivello della campata successiva e così a ripetere. A valle del calcolo vero e proprio, all’interno del foglio sono inserite anche le principali verifiche previste dalla Normativa di riferimento. Il calcolo è stato poi ulteriormente verificato considerando tutte le configurazioni di carico intermedie con veicoli solo parzialmente caricati. L’impianto risulta tecnicamente fattibile ed economicamente sostenibile.
Studio di fattibilità tecnico-economica di un collegamento via fune nel comune di Aprica
Zuccoli, Alberto
2023/2024
Abstract
This thesis deals with the technical-economic feasibility study of a cableway connection between the localities of Tresenda, in the Province of Sondrio, and Aprica, a renowned winter tourist resort. The objective of the paper, in addition to mere planning, is the development of a calculation programme and analysis methodology that can be replicated for other Alpine resorts. The municipality of Aprica has always been a place of transit for goods and travellers coming from Trentino via the Tonale Pass and heading to Valtellina and Lake Como, and it is also a popular winter resort that, due to the large number of tourists, is burdened with a large number of cars. The aim of the project is to relieve the resort of traffic. Following a geographical analysis, the only option is the construction of a cable car from the Valtellina side. The feasibility study from a technical point of view presents a bi-univocal correspondence with the economic-financial study: the choice of the type of installation is influenced by the costs and revenues, which are in turn a function of the speed and waiting times. Since it was not possible to realistically analyse every type of installation and its relative costs - earnings, a skimming was therefore carried out based on experience, deciding to continue the study with only the ‘monocable - bicable - tri-cable’ types. An SP investigation was carried out comparing private transport, varying by two attributes on two levels, with cable car transport, varying by three attributes on three levels, for a total of 108 scenarios. The objective of the investigation is to calibrate the log-binomial formula by iteratively maximising the log-likelihood equation. The equation provides the probability of choosing a solution as a function of attribute variation. An analysis of the potential demand for seasonal or annual use was also performed, from which the number of potential users is found by multiplying it by the probability of choice. In addition, the ticket price from which the revenue is derived. Overall, after estimating the construction and operating costs, the chosen installation is the single-cable detachable gondola. The line calculation consists of designing the profile of the entire line of the installation by positioning the supports and stations according to the terrain profile and loads. The first step is a pre-dimensioning from which, iteratively, the upstream tension is calculated as a function of the rope diameter. Since line calculation is an iterative and repetitive procedure, I set up a Microsoft Excel spreadsheet to automate the various operations: starting with the values of the downstream rope pull, length and height difference of the span to be calculated, it estimates the load on the downstream support from which follow the rope angles and the arrow, calculated using the catenary formula. Once the span has been calculated, the calculation is automatically repeated six times, and you can move on to the next sheet by entering the length and height difference values of the next span and so on. Following the actual calculation, the main verifications required by the reference standard are also entered in the sheet. The calculation was then further verified by considering all intermediate load configurations with only partially loaded vehicles. The system was found to be technically feasible and economically viable.File | Dimensione | Formato | |
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Allegato C.pdf
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Descrizione: Allegato C
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1.13 MB
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10_2024_Zuccoli_Alberto.pdf
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Descrizione: Testo della tesi
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4.93 MB
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4.93 MB | Adobe PDF | Visualizza/Apri |
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https://hdl.handle.net/10589/227273