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Top Attractions in Tehran

Tohid Tunnel

Tohid Tunnel is a tunnel in Tehran, Iran. It is about 3 km long, the third longest urban tunnel in Middle East. Tohid Tunnel broke construction records when it was opened in less than 30 months. The interior designs met the highest safety requirements. It includes installation of utilities equipment in the Tunnel, and manufacture and mobilization of north and south fans combined ventilation equipment, and control building and Niyayesh shaft. 70 jet fans, each powered at 30 KW. North fan combined ventilation equipment: 3 axial fans, powered at 600 KW. Niyayesh fan combined ventilation equipment: 2 axial fans powered at 410 KW. 4 axial fans powered at 500 KW. South portal fan combined ventilation equipment: 3 axial fans powered at 990 KW. Air washing system at the air entering Niyayesh fans. Total number of lights in the Tunnel: 1,064 lights powered at 550 KW. Length of cables for the utilities: 220 km. Special and standby power generators (in case of a power cut in Tehran Power Grid, the lighting system of the Tunnel fed by these generators will be automatically switched on and the power will be compensated). Smart firefighting system. Traffic alarms. Intercom telephones. Closed-Circuit TV. Vehicles counter. Road closing system. Traffic signs. Thermal sensors. Air pollution sensors and other facilities. Tunnel Drainage System Towheed drainage system operates by various channels. The surface water accumulated around and the Tunnel will be drained into the canals installed along the Tunnel wall, and will enter into a channel which is installed exactly in the middle of both twin tunnels. The drained water will be conveyed through the latter channel to the south part of the Tunnel, and it will be carried away from the Tunnel by some kanats. Major Work Item Quantities of Towheed Tunnel Excavation: 720,000 m3 Length of Piling: 26,000 m Formwork: 56,000 m3 Rebar: 28,000 tons Strengthened Structure and Framing: 15,000 tons Concrete Placement: 230,000 m3 Shotcrete: 450,000 m3 Mesh: 250,000 m3 Concrete Precast Segments: 60,000 m3 Towheed Tunnel Construction Project Towheed Tunnel Project is an urban underground structure, located within the area of Chamran Highway, Towheed Square, Jomhouri Square, and Navab Highway, with a length of about 3 km (Tunnel + entry ramps). Subsequent to studied on the Comprehensive Plan of Tehran, in order to make an easy access from the north to the south of Tehran and vice versa, along the north-south corridor, between Chamran Highway constructed during the 70s, and Navab Highway constructed during the 90s, sufficient studies were made by Tehran Municipality in 1998 so that the connection of the said two Highways, i.e. to fill the gap between Towheed Square to Jomhouri Square becomes practicable and operational. The significance of the above issue, the congested traffic on Tehran highways, and the intense exigency of Tehran as a metropolitan city to have the above Highways connected, made Tehran Municipality to launch exhaustive studies to tackle such purpose, and by comparing the existing alternatives, the best alternative which was construction of a tunnel similar to Tehran Ressalat Short Tunnel, was adopted and approved. To this end, in early 2007, a Contractor was assigned to construct the Project, and on 11.06.2007 the contract to kick off the Project was signed and notified to the Contractor, whereby on 19.06.2007 the construction works of Towheed Tunnel Project were actually commenced. General Specifications • Client: Engineering and Construction Division of Tehran Municipality • Project Manager: Operational Management of Engineering Structures Co. • EPC Contractor: Perlite Company, assigned with the above task in respect of its precedent successful quality achievement in the construction Tehran Ressalat Tunnel Project. The construction site of this Project was located within the distance between Fatemi Ave. in the north of Towheed Square, and Navab Highway in the south of Azerbaijan street junction.

Pardis Technology Park

Pardis Technology Park (Persian: پارکِ فناوریِ پردیس‎‎) is an technology park, based in Pardis, a satellite city 20 kilometres outside of the Tehran metropolitan area, in Iran. The park is located adjacent to a Telecommunication Company of Iran Satellite Earth Station, at the foot of the Alborz mountains. Land has been allocated here for the establishment of business related to technology. The site enjoys a panoramic view of the tallest mountain in Iran, Mount Damavand. Pardis Technology Park as the region's technology paradise, under supervision of Presidency and a fourteen-entity Board of Trustees from ministries, science centers and academies, is located in a now 38 hectares area at 25 km northeast vicinity of Tehran. As of 2011, around 75 companies have signed contracts for land at the park. 37 of them have finished construction of their R&D centers and out of them 23 companies run their activities and completely located in the park (Lands). with accounting companies which are doing their business in rental flats, PTP has more than 51 companies located in Multi-Tenant Building and Business Incubator Center. Totally PTP has 123 Hi-Tech companies as its members in different establishment categories (Lands, Multi-Tenant Building and Business Incubator). As of 2012, 80% of investments in the park came from the private sector and 150 technologies have been developed and registered there. As of 2013, a number of Iranian companies have transferred their R&D departments to PTP.

Mount Khajeh

Mount Khwaja or Mount Khwajeh is a flat-topped black basalt hill rising up as an island in the middle of Lake Hamun, in the Iranian province of Sistan and Baluchestan. The trapezoid-shaped basalt lava outcropping, located 30 km southwest of the town of Zabol, rises to 609 meters above sea level and has a diameter ranging from 2.0 to 2.5 kilometres. It is the only natural height in the Sistan area, and is named after an Islamic pilgrimage site on the hill: the tomb and shrine of Khwaja Ali Mahdi, a descendant of Ali ibn Abi Talib. Mount Khwaja is also an important archaeological site: On the southern promontory of the eastern slope, the ruins of a citadel complex known as the Ghagha-Shahr with its remains of a fire temple attest to the importance of the island in pre-Islamic Iran. According to Zoroastrian legend, Lake Hamun is the keeper of Zoroasters seed. In Zoroastrian eschatology, when the final renovation of the world is near, maidens will enter the lake and then give birth to the saoshyans, the saviours of humankind. The fire temple is on a terrace behind high walls and is protected by two forts, whose remains are respectively known as Kok-e Zal and Chehel Dokhtaran. Collectively, the ruins are called Qala-e Kafaran "Fort of Infidels" or Qala-e Sam "Fort of Sam," the grandfather of the mythical Rostam . Both names reflect pre-Islamic heritage. The walls of the temple were once extravagantly decorated with murals, some of which are now on display in museums in Tehran, Berlin, New Delhi and New York. The citadel complex was first investigated by Marc Aurel Stein in 1915-1916. The site was later excavated by Ernst Herzfeld, and was again investigated in part by Giorgio Gullini in a short expedition of 1960. Initially, Herzfeld tentatively dated the palace complex to the 1st century CE, that is, to the Arsacid period . Herzfeld later revised his estimate to a later date and today the Sassanid period is usually considered to be more likely. Three bas-reliefs on the outer walls that depict riders and horses are attributed to this later period. Beyond the citadel at the top of the plateau are several other unrelated buildings, of uncertain function and probably dating to the Islamic period.

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