Hiển thị các bài đăng có nhãn tunnel excavation. Hiển thị tất cả bài đăng
Hiển thị các bài đăng có nhãn tunnel excavation. Hiển thị tất cả bài đăng

10/23/2011

SE Asian HRC import prices continue slide, buyers hold off


Offer prices for hot rolled coil continue to tumble in Southeast Asia, particularly in Vietnam. Chinese offer for 3-12mm thick SS400B HRC to Vietnam are now heard at $640-650/tonne CFR, down from $665-675/t week ago.

“Chinese HRC prices appear to be collapsing,” a Vietnamese importer tells SBB. The plummet in Chinese HRC prices has been sharp and rapid – down around $50/t over the past two weeks. Regional traders believe that Chinese exporters are in a hurry to sell because of liquidity problems and concerns over slowing economic growth in the country.

The prices for other origins are similarly falling. Offers of 2mm SAE 1006 Korean HRC are now $685-690/mt CFR from around $705/t CFR a week ago. A lot of around 25,000t of Japanese 2mm base re-rolling grade HRC was booked last week at around $695/t CFR Vietnam.

Around 25,000t of Ukrainian 2-3mm commercial grade HRC was booked at $680/t CFR Vietnam more than two weeks ago. “It was before the plunge in coil prices,” says a trader who believes that importers will rather delay purchases since prices have not bottomed out.

Importers are hesitating to book in the current bearish market. "Traders keep lowering prices to get bids. But buyers cannot decide whether to buy if prices keep falling,” a local trader tells SBB. This constant lowering of prices is undermining buyers' confidence in the market, he adds.


The Taiwanese mills are noticeably not offering HRC to Vietnam. "The mills here cannot compete," Taiwanese trader says. They are aiming to export HRC at around $700/t FOB.

8/20/2011

THI CÔNG TẦNG HẦM TOPDOWN VỚI TƯỜNG VÂY CỪ VÁN THÉP VĨNH CỮU


Bước 1: Giả phóng mặt bằng
Hạ các rãnh thi công tường cừ xuống đến một độ sâu khoảng 2 m. Loại bỏ các chướng ngại vật đến công tác thi công, loại bỏ các vật liệu, tạp chất có khả năng gây nguy hại đến tường cừ.
Hạ mặt đất tầng hầm đến cao độ mặt của tấm sàn tầng trệt.
Đặt thảm phân cách.

Bước 2: Thi công hạ cừ
Hạ cừ ngàm vào lớp cát, sử dụng búa rung hạ xuống đến lớp bùn đá phần còn lại dùng búa rơi nếu gặp trở ngại.

Giai đoạn 3: Thi công cọc khoan nhồi
Cắt đầu cọc ván thép.
Thi công cọc khoan nhồi cốt thép đường kính 600 mm ngàm chân các cọc thép
Rung hạ các ống vách cọc khoan nhồi đến cao độ sau đó khoan lấy đất cho ống rỗng đạt cao độ thiết kế.
Hạ cốt thép ngang mức đáy tầng hầm, rung rút dần ống vách ngang với bê tông chân cọc, hạ chân cọc sắt tầng hầm ngay khi đổ bê tông ướt, lấp đầy ống vách bằng vật liệu san lấp rồi tháo ống vách sau khi đủ độ co kết bê tông ngàm chân cọc.


Giai đoạn 4: Đổ bê tông sàn tầng hầm (sàn mặt đất)
Lắp đặt các giếng hạ mực nước ngầm.
Hoàn thiện đáy sàn đổ bê tông lót, lắp đặt ván khuôn, hàn liên kết tường vây cừ và sàn móng với ván khuôn.
Lắp đặt các liên kết sàn và cột.
Gia cố và đúc tấm sàn mặt đất.













7/04/2011

Hanoi Metro, Vietnam


Project in Brief:
Project Type: Metro rail system
Location: Hanoi, Vietnam
Number of Metro Routes: Five
Expected Completion: 2020
Owner: Hanoi Metropolitan Rail Transport Project Board
Other Key Players: SYSTRA
Contractors: Samsung, Daewoo, Ska, Kumho and Kangnam


Hanoi Urban Metro (Hanoi Metro) is a metro rail system that will be developed in Hanoi, Vietnam, by 2020. The project is part of an integrated development programme for urban transport in Hanoi and will provide a safe, efficient and clean urban transportation system. It is the fourth-biggest project in Vietnam to utilise the Japanese Government’s official development assistance capital.

Hanoi is the capital of Vietnam and the country's second-largest city, with a population of about six million. Many trains, including services to Hai Phong and Ho Chi Minh City, depart from Hanoi station. The Union Express travels from Hanoi to Ho Chi Minh City, stopping at cities and towns along the route.

Commuters in Hanoi use motorbikes, buses, taxis and bicycles. The metro project is part of the Vietnam Ministry of Transport's master plan, which aims to reduce the use of private transport and enhance the urban environment.

The metro system will have five routes. The main route - line 3 - will be the first metro line in Hanoi. On completion, the route will provide transport to 200,000 passengers a day. It broke ground in September 2010 and is expected to become operational by the end of 2015.

The entire project is being carried out by Hanoi Metropolitan Rail Transport Project Board (HRB), formerly known as the Hanoi Authority for Tram and Public Transport Development Management (HATD). Technical studies of the system were completed in 2009.

Project


"The 12.5km pilot line will incorporate a 5.5km single track U-viaduct and a 4km twin tunnel."

The feasibility study for a Hanoi metro pilot route / line was completed in October 2005 and design of the pilot line started in 2007. The pilot route will be an east-westbound line and will connect 12 stations in the city bewteen Hanoi station and Nhon depot.

The 12.5km pilot line will incorporate a 5.5km single track U-viaduct and a 4km twin tunnel structure. The system will include 9.6km of elevated and 2.9km of underground sections, and will use 20m metro trains top transport 900 passengers in a single trip. The trains will run at 80km/h, covering the entire route in 20 minutes.

International consulting engineers HRB and SYSTRA signed two contracts to construct the pilot line. Each contract is worth €36m and the total cost of the pilot line is about €500m.

SYSTRA will assist with the commissioning, launch and operation of the service and will supervise the construction and manufacture of rolling stock. It also provided design studies and assessed bids.

The metro's infrastructure will include a viaduct, an underground section, stations, a depot and rolling stock maintenance centre and power supply stations. The construction of line two will begin in 2011 and is expected to be operational in January 2016.

Line routes

Hanoi Metro's routes will include Nam Thang Long to Tran Hung Dao, Nhon to Hanoi station, Cat Linh to Ha Dong and Yen Vien to Ngoc Hoi.

The route connecting Nam Thang Long and Tran Hung Dao will be 11.54km long and serve ten stations. The line will include an 8.55km underground section.
"The metro's infrastructure will include a viaduct, power supply stations and a depot."

The pilot line (line 3) between Nhon depot and Hanoi station will start at Nhon and travel to Cau Giay via National Highway 32, Ho Tung Mau and Xuan Thuy. It will also pass through Kim Ma, Nui Truc and Quoc Tu Giam.

The 13km-route connecting Cat Linh and Ha Dong will travel from Cat Linh to Thai Thinh via Hao Nam and Hoang Cau. From Thai Thinh the line will move towards National Highway 6, connecting Nga Tu So, Nguyen Trai, Tran Phu and Quang Trung.

Financing

The project is being coordinated and financed by several organisations including the World Bank, the Asian Development Bank and the European Investment Bank.

The latter has granted a €173m loan to help fund the construction of line 3.

Part of the project is being financed by Agence Française de Développement (AFD). The money provided by AFD is being used to construct the pilot line's infrastructure.

The project is being co-financed by bilateral overseas development assistance loans. They amount to €280m, of which €200m is tied and €80m is untied.
Source: http://www.railway-technology.com