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Keywords: mixing ship concrete maneuverization
In recent years, with the continuous expansion of the national infrastructure construction, the degree of mechanization of construction is getting higher and higher, and the construction site is also very different. For example, the scale of construction such as river governance, bridge erection, and seaport construction continues to expand, and the construction site of construction is continuously by land. Extending to the offshore, the amount of concrete poured in the water is greatly increased. This long-term development of the water construction process has challenged the traditional concrete mixing equipment. The traditional concrete mixing equipment is that the concrete mixing equipment is generally installed on the land near the sea. The agitated concrete is transported to the vicinity of the construction site along the pre-repaired trestle by the mixer truck, and then transported to the designated construction site through the concrete pump. Due to the problem of poor mobility and inconvenient transportation in transportation, the market needs a kind of concrete mixing product with good mobility and low price. The water mixing station and the mixing vessel came into being. This product is a ten-year research and development of Fangyuan Group. The technology and experience of the concrete mixing plant was developed by itself to meet the needs of the market.
Foreign concrete mixing technology is only advanced in Europe and America. However, due to the relatively high price of similar products abroad, it has been difficult to enter the Chinese market in recent years. In this context, it is necessary to expand the production of water mixing stations ( Including platforms and mixing boats) to increase our market share.
1 basic structure of the mixing ship:
STC150 cement concrete mixer ship adopts all-steel structure, and the main steel structure is connected, and the production line is symmetrically arranged. The whole structure of the mixing station can be divided into: stirring main building unit, aggregate batching unit, aggregate conveying unit, powder feeding system, It consists of independent system units such as water supply system, liquid admixture system, pneumatic system and control system (see Figure 1).
2 engineering features and installation difficulties:
(1) The Sutong Bridge is more than 20 kilometers long and is located between Suzhou and Nantong. It crosses the Yangtze River estuary. Due to the influence of the marine climate, the water level at the mouth of the Yangtze River (where the Sutong Bridge is located) is daily. As the sea rises and falls, the water level changes up to about 5m.
(2) Due to the special nature of the construction project, the piles of Sutong Bridge have the characteristics of short construction period, high production efficiency and high quality requirements, and no root piles must be poured at one time, so it is necessary to produce the whole concrete. Production requirements for assembly line operations.
(3) The concrete station shall be installed on a hull of 70.2m in length and 19.6m in width. The deck of the ship itself has a curved surface, and the hull is at an angle of 1:18 before the ship is launched. The hull is welded at the same time as the concrete station. , marine electrical appliances, ancillary equipment, etc., the professional construction team in the same area cross-construction, so that the entire construction site is in a complex and variable environment, increasing the difficulty of construction.
3 key technical issues:
(1) Multi-subject technical interface and technical coordination issues;
(2) Development of electrical control systems and design of software systems;
(3) Eliminate the influence of wind power in multiple directions and enhance the stability of the overall structure;
(4) Water scale, cement scale, admixture scale, fly ash scale, stability design of metering system;
(5) The design of the massive aggregate storage hopper to meet the needs of the work;
(6) Increase moisture-proof measures to reduce seawater corrosion.
4 construction preparation and installation and use
4.1 Preparation before installation:
(1) Before installation, check whether the accessories and technical documents are complete according to the packing list, check whether the whole machine and parts are defective, and match the equipment delivery requirements before installation, and must be adhered during transportation. The dirt parts are cleaned and wiped.
(2) According to the requirements of the basic drawing, check the relative position of each foundation to ensure accuracy.
4.2 Installation and production of the aggregate batching system, see Figure 3.
Release the line according to the requirements of the basic drawing. After the bottom bin is closed, the discharging belt conveyor is first placed. After the deck is closed, the feeding mechanism is prepared, and after adjusting, the center line of the installation position of each part is coincident with the corresponding center line of the foundation, the discharging belt conveyor and the feeding mechanism can be fixed, and the weighing system is fixed. On the rack, adjust the balance of the weighing hopper so that each sensor is in a uniformly stressed state.
4.3 Installation of the mainframe part, see Figure 4.
(1) The mixing machine (including the chassis, reducer, motor, mixer, chassis) is locked with a wire rope and then lifted.
(2) When lifting, it should be balanced by hand. After stabilization, it will gradually fall down to prevent the wire rope from loosening or falling off.
(3) Adjust the height of the chassis so that the chassis level can be welded to the deck steel plate.
4.4 Install the cement scale, water scale and admixture scale of the upper bracket and the upper bracket, as shown in Figure 5.
(1) Lift the cement scale, water scale and admixture scale to the respective installation positions on the upper bracket.
(2) The weighing platform 1 and the weighing platform 2 are mounted on the upper bracket, and the guard rail 1 is connected to the weighing platform 2.
(3) Bolt the upper bracket and the lower bracket.
(4) The two upper brackets are connected by the transitional walkway 1 and the transitional walkway 2, and the transitional guardrail 2 and the transitional guardrail 3 are respectively connected to the transitional walkway 1 and the transitional walkway 2.
Application of concrete mixing ship in water foundation construction engineering
Abstract: This paper introduces the working principle, basic structure and installation and use of the concrete mixing ship in combination with the actual application of the Sutong Bridge project, and summarizes some experiences and lessons of installation and use. It is considered that the water mixing station or the mixing ship is There are certain advantages in terms of construction, mobility, and low price on the water surface.