Mirna bridge
Coordinates: 45 ° 19 ′ 46 ″ N , 13 ° 37 ′ 36 ″ E
| Mirna bridge | ||
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| Official name | Most Mirna | |
| use | A9 in Croatia | |
| Crossing of | Mirna | |
| place | Istria | |
| Entertained by | Bina Istra | |
| construction | Girder bridge | |
| overall length | 1378 m | |
| width | 10.1 m | |
| Longest span | 70.1 m | |
| opening | 2005 | |
| toll | 18–125 HRK depending on the vehicle class | |
| location | ||
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The Mirna Bridge is located between the Nova Vas and Višnjan junctions of the Croatian A9 in Istria . It spans the Mirna with its wide river valley. It is over 1.3 km long and has two lanes. The opening to traffic took place in 2005. The bridge is one of the most prominent parts of the motorway. The bridge was designed by Zlatko Šavor .
The A9 Umag - Kanfanar was raised to motorway status in June 2011. However, this extension work did not include a new parallel second carriageway. This expansion should be made up for in 2013–2015. [outdated]
description
The bridge structure consists of 22 arches: 1 × 51.07 m, 15 × 66.5 m, 1 × 70.1 m, 2 × 50.01 m, 1 × 61.1 m, 1 × 42.6 m and 1 × 30.5 m. The original design of the bridge was based on arches of 66.5 m. The final design was influenced by the nature of the soil and the arrangement of the river bed and canals under the bridge. Since the foundation has an extremely low load-bearing capacity, reducing the weight was very important. For this reason, the construction has two weight-reducing elements: longitudinal steel girders and pillars with head beams at different heights. The latter reduces the concrete volume required for the pillars and thus the weight of the structure, while the bridge has a curved, concave surface.
Since the valley harbors a high-quality arable land worth protecting, this was taken into account when designing the pillar bases. The height of the reinforced concrete pillars varies between 13.45 m and 40.03 m, and each of the pillars is crowned by a head beam. The pillars have an I-cross section, the webs being aligned along the axis of the roadway. The outer pillars (P1, P2, P20 and P21) are designed as shallow foundations , while the inner pillars have driven piles . The superstructure consists of two prefabricated longitudinal girders of constant depth with a distance of 550 cm, in conjunction with the deck and cross girders. The structure of the superstructure is a continuous 1354.86 m long girder over 22 arches, which follows a horizontal and vertical curve. The cross-section of the superstructure consists of two massive steel girders in the I-profile of constant depth.
Traffic volume
Regular traffic counts are carried out by Bina Istra , the operator of the bridge and the entire A9, and published by Hrvatske ceste . Significant fluctuations between annual and summer traffic volume are due to the fact that the bridge is on the route to tourist destinations in Istria and the Adriatic coast . The count is based on the number of toll tickets sold.
| Traffic volume of the Mirna Bridge | ||||
| Street | Counting point | year | summer | Remarks |
 A9
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2722 Mirna toll station | 4659 | 10,821 | between the junctions Nova Vas and Višnjan ; As of 2009 |
See also
Web links
Individual evidence
- ^ Croatia: Maut & Vignette. ÖAMTC, accessed on January 21, 2014 .
- ^ The Most Important Road Structures. (No longer available online.) Bina Istra , formerly in the original ; accessed on September 24, 2010 (English). ( Page no longer available , search in web archives ) Info: The link was automatically marked as defective. Please check the link according to the instructions and then remove this notice.
- ↑ a b Zapadni krak "istarskog ipsilona" i most preko Mirne. (No longer available online.) Građevinar, archived from the original on July 18, 2011 ; Retrieved September 24, 2010 (Croatian). Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice.
- ↑ a b c Vijadukt preko Mirne na istarskoj brzoj cesti. Gradimo, accessed on September 24, 2010 (Croatian).
- ↑ Tvorac najvećih hrvatskih Mostova. Nacional, accessed September 27, 2010 (Croatian).
- ↑ Ipsilon postaje Autocesta. Novi List, accessed June 26, 2011 (Croatian).
- ^ Full profile motorway construction plan. (No longer available online.) Bina Istra , formerly in the original ; accessed on September 24, 2010 (English). ( Page no longer available , search in web archives ) Info: The link was automatically marked as defective. Please check the link according to the instructions and then remove this notice.
- ↑ Istra dobila prve kilometer autoceste. I cestarinu također. Jutarnji list, accessed September 24, 2010 (Croatian).
- ^ Croatian Motorways, pp. 409-410. (No longer available online.) Hrvatske autoceste, archived from the original on August 18, 2010 ; Retrieved May 17, 2010 (English). Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice.
- ↑ Traffic counting on the roadways of Croatia in 2009 - digest. (No longer available online.) Hrvatske ceste, archived from the original on July 21, 2011 ; accessed on September 24, 2010 (English). Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice.
