Since 2009, the construction unit and ship designers have visited the waterway conditions of Wujiang River system for many times, actively consulted relevant experts and scientific and technological departments inside and outside the province, and combined with the characteristics of ship regulation of "two rivers and one river" and Chishui River in our province, developed a design scheme with the goal of saving ship energy consumption, reducing fuel consumption, improving ship technical and economic indicators, being economical and practical, people-oriented, reducing workers' labor intensity, scientific construction equipment and improving economic benefits. This paper introduces the mountain rapids construction ship developed by Guizhou Province.
2.2. 1 channel condition construction scheme
After hydropower development, Wujiang river basin has become a cascade reservoir area, and the tail water section of the reservoir area belongs to a typical mountain rapids. The change of geology and geomorphology has turned into a natural original channel with large beach, steep beach, danger, shallowness, narrowness and much siltation.
2.2 Scheme selection basis
Through the detailed demonstration and summary of Chishui River and the construction of "two rivers and one river", the experience of real ship operation is collected; In view of the similar natural conditions of the three-channel waterway, in the dry season (gate opening), the water flow is slow, which is convenient for construction, the water depth of the waterway is limited, and the draft of the ship is limited, so it is impossible to reach the construction site by itself. During construction in flood season, the water level is too high, and the beach is large, urgent and dangerous, so it is difficult for ships to locate on the beach. In addition, the river is turbid, the regulation effect is very poor, the investment is large, and the work efficiency is low, which can not meet the construction needs at all. Therefore, on this basis, the following scheme has been developed.
3. Features of mother ship 3. 1 stone grab boat
The main features are: the main dimension of the ship is too small, the draft is too large, the beach crossing ability is poor, the speed is low, and transshipment is difficult.
3.2 stone truck
The main features are as follows: (1) The stone carrier of the "Two Rivers and One River" shipping project adopts hydraulic tipping bucket to push the goods; "Chishui River" water conveyance project adopts hydraulic side-opening unloading. The stability of the ship is poor, and the hydraulic cylinders cannot be completely synchronized when unloading stones. The bucket is high and has a small loading capacity, which is inconvenient and has potential safety hazards.
4. Design scheme
4. 1 Considering the overall layout, Captain 4. 1. 1.
In order to ensure the maximum power of the main engine and meet the needs of the maximum cargo capacity and rapids' passing capacity, the captain should be selected in consideration of channel conditions, resistance performance and economy.
4. 1.2 width
Inland river ships are limited by draught. In order to ensure the use of ships in Chishui River and the "two rivers and one river" water transport construction project:
In Chishui River and "Two Rivers and One River" waterway construction projects, ships adopt flat-headed waves, round bilge lines in the middle and short full tunnel lines in the tail, which leads to poor propeller water supply and large stern waves, resulting in increased wave-making resistance and shape resistance, mismatched propellers, reduced propeller propulsion efficiency, poor beach walking ability, long transportation cycle and high power.
The proposed ship is optimized by combining excellent ships inside and outside the province, and the bow is flat-headed and waves are pressed; The bottom of the cabin adopts a circular bottom line with a curved belt, and the arc of the bottom is up to.
4. 10 freeboard and stability
Calculate and check freeboard and stability according to (2004) inland river legal survey rules and (2008) revised bulletin.
4. 1 1 rudder system, shafting and pipeline system
The rudder system, shafting and pipeline system are all designed according to the (2009) Code for Construction of Inland River Steel Ships, which meets the requirements of the code.
4. 12 outfitting equipment
According to the Code for the Construction of Inland River Steel Seagoing Ships (2009), a set of mechanical winch for mooring and wringing beaches and related construction machinery are equipped.
4. 13 electrical, signal and communication equipment
The ship is designed with a 50KW generator set for use by construction machinery, engine room seawater pump emergency, fire pump and searchlight. Signal equipment is equipped according to the collision rules of inland river ships; The communication equipment is equipped with a radio station and a set of loudspeakers; Equipped with an effective reaction device.
4. 14 others
Fire fighting equipment, lifesaving equipment, pollution prevention equipment, etc. According to the provisions of the specification.
5. Characteristics of the proposed ship type
The proposed ship type scheme is modulated on the basis of extensive collection of existing excellent ships, and comprehensive evaluation is made in combination with operational economic indicators to ensure the maximum power, maximum load and rapids' ability to go to the beach. The characteristics of the proposed scheme mainly include the following aspects:
5. 1 simple ship type
Flat-headed wave bending type, open-ended tunnel type at the tail, large square coefficient, large cargo capacity and shallow draft, suitable for the characteristics of mountainous rivers.
5.2 Fast speed
Because the ship is a shallow-water rapids ship in inland river, it has shallow draft, flexible handling, strong beach crossing ability and low energy consumption, and it is an economical ship with high load.
5.3 Strong applicability
The ship has good floating state and draft adjustment. The draft of the stone carrier is guaranteed to be below 1.2m, and the draft of the stone grab is below 0.9m, which ensures the economic index of the ship. At the same time, the stone truck adopts the hydraulic cylinder of the concave side door of the main deck to push the unloading mode, and at the same time, it has the load capacity to improve the safety and reliability.