Name of the project: Consultancy Services for Survey, Detailed Design and Construction Supervision of DryDock at Sattahip Naval Base
Consultant : Dynamic Engineering Consultants Co.,Ltd.
Location: Sattahip, Chonburi Province, Thailand
Name of owner: Royal Thai Navy
Financing agency/institution: Royal Thai Navy
Value of project1: Baht 5,500 Million (Baht 25/US$)
Value of firms, or JV, or Baht 76 million (Baht 25/US$)
consortium’s contract1:
Original and actual dates (original/actual) 1 Oct.1992-18Jun.1993
of commencement & completion:(DD), 7 Jul.1995-30 Jan.2000(CSC)
Form of firm’s participation2: Member of a consortium of consultants
Name of other memebers of consortium2: With BMT Group, UK for design only with jointly and severally responsible for the performance.
Brief description of project and the works to which the firm’s services was provided:
The Royal Thai Navy (RTN) envisioned to develop a Dry Dock in their vast premises in Sattahip, Chonburi, Southeast of Bangkok. The Dry Dock is located adjacent to the existing Sattahip Commercial Port. It will serve as the repair and maintenance facility of RTN’s Helicopter Support Ship (HSS), as its primary purpose, and to RTN’s smaller ships.
It may also provide services to military ships of friendly countries. The total project area is about 110 hectares, 40 hectares of which is reclaimed. Apart from the Dry Dock and its related Workshops and Facilities, other facilities are:
- 4-storey Administration Building with a total floor area of 5,000 m2.
- 2 Club Houses for officers and non-officers
- Sports Complex (indoor and outdoor)
- Residential buildings
- Multi-purpose and Mess Hall
- Roads and infrastructure
- 2-storey reinforced concrete factory buildings with total floor area of 6,500 m2 each;
- 5 workshops
- Water reservoir and raw water distribution pipe lines
- Water treatment plant
- Crane footing for lift capacity of 50 and 200 tons
- Paving block.
Brief description of the services provided by the firm or consortium:
SEATEC by Dynamic Engineering Consultants Co., Ltd. rendered the engineering consulting services to the Royal Thai Navy on the survey, design and construction supervision of Dry Dock with the following scope of services:
- Site Investigation, Master Plan Preparation,
- Dry Dock with dimension of 40x236 m. and 18 m. depth with equipment for the ship capacity of 2,500 dwt.
- Arrival Berth 350 m. length
- Refit Berth 340 m. length
- Dredging and Reclamation work
- Control building and generator
- Water supply and underground water reservoir
- Wastewater treatment plant
- Electrical work
- Equipment: fire fighting, piping system, dock pump, dock gate, dock lift, capstan
- Office buildings and residential housing
- Utilities work
- Project work schedule, cost and quality control.
- Preparation of B.O.Q. and project cost estimation.
- Preparation of tender documents.
- Bid evaluation and recommendation of Contractors.
Brief description of Engineering Technique:
The Gravity Dry Dock is reinforced concrete structure which is similar to an open top box. It is composed of concrete floor and 3 sites of wall, which is 40 m. width, 236 m. long and 18 m. depth, the 4th wall open to the sea. It has steel flap gate open and close when ship in and out. Concrete floor is 14.50 m. below mean sea level. When dock gate is closed and water is pumped out until dry (to make ship lay on cushion), developing uplift pressure from under ground water beneath dock floor approximately 220,000 tons.
While death weight of dry dock is less than the uplift, approximately 134,000 ton, that foundation has to be designed to resist the uplift pressure. By increasing of dead weight for the dock, it is required to add 12 m. cantilever wing covered by soil on both sides adequate to resist the water uplift pressure on the structure. Considering of Arrival Berth and Refit Berth, and it utilization to serve the large ship, it requires very deep level at the front of berth.
Also need to reclaim the land at back of berth for other utilization, for this case the structure of concrete caisson at the front of berth is most suitable. Each caisson, which is similar to chalk box, is 13x25x15 cu.m. (WxLxH) strengthen it with separated concrete wall. Each unit weights 1,500 ton continuously connected at front of berth depending on required place and length.