The basic type of continuous casting machine has a variety of models such as vertical continuous caster, vertical bending, horizontal continuous caster, arc and multi-point bending. Continuous casting methods are divided into single-stream and multi-stream. Casting products include slabs, square billets, round billets and octagonal billets. The operation of casting billets is generally carried out by placing the ladle on a turntable or directly hoisting the ladle on a crane. Therefore, the basic forms are also different.
The structure of the foundation of the continuous caster is more complicated. From the ladle turret to the foundation of the shearing machine, the height is uneven. According to the design of some projects, the top level of the foundation is as high as 10~15m, and the height of the base is 5~-8m. Trenches and cable tunnels are arranged in the foundation (see picture). The load of each part of the foundation is quite different. Therefore, it should be based on the foundation design plan (such as natural foundation or pile foundation, etc.), the layout of process equipment, the distribution of the load of each part, the layout of the channel in the foundation, and the relevant design specifications. The specified allowable maximum length of the foundation and other conditions, reasonably determine the location of the foundation deformation joints. The foundation of the continuous caster is a mixture of block type, wall type, frame type, box type, pit type, beam, plate type and other structural forms.
The loads and external forces acting on the foundation include:
(1) The weight of the equipment acting on the foundation and the structural dead weight from the steel platform of the continuous caster and the weight of the equipment acting on the steel platform, and the single molten steel when the continuous casting machine is running. The deadweight, molten steel weight and operating load of the ladle and double ladle.
(2) Horizontal force, bending moment and torque generated during equipment operation.
(3) The external force generated by abnormal operation during the production process, for example, the vibration caused by the unstable operation when the ladle is placed on the turntable. In this case, the weight of the molten steel and the ladle is generally multiplied by the power coefficient. Since the ladle can change positions on the turntable, the unfavorable load combination generated when the ladle is at different positions must be considered.
(1) When the various parts of the foundation of the continuous caster are decomposed into wall, frame, box, pit or beam-slab components, the internal force and reinforcement must be carried out according to their actual stress conditions. (2) When the cable tunnel and the water trench are located at the edge of the foundation, where the trench wall is thin, and the groundwater level is higher than the bottom elevation in the trench, the influence of groundwater pressure on the bearing capacity of the trench must be considered and the crack width must be checked.
(3) The center of gravity of the applied load, the weight of the overburden and the weight of the foundation and the centroid of the bottom of the foundation should be located on the same vertical line as far as possible. Check the bearing capacity of the foundation based on the above loads.
(4) When the foundation of the continuous casting machine is built in the seismic fortified area, the seismic check calculation must be carried out. When the foundation is built on a soft soil site, pile foundations or other artificial foundations can be used.
(1) The ladle turret and its supporting frame or wall underneath are generally subjected to high strength, so the concrete with strength grade C25 or C30 is generally adopted the continuous caster foundation adopt C20 or C25. Concrete.
(2) The foundation is made of ordinary reinforced concrete. On the top of the ladle turret, it is necessary to locally build refractory bricks vertically and horizontally to insulate the foundation body according to the requirements of the process. When the refractory bricks are erected vertically, they need to be tied with the embedded steel bars of the foundation.
(3) The anchor bolts of the equipment are mostly deadbolts buried at one time. In the range of the ladle turret platform, T-head live bolts are generally used. For large continuous casting machine, prestressed bolts should be used. Since bolts are mostly made of high-strength steel, electric welding and fire are strictly prohibited during construction and installation.
(4) Reasonably choose the location of construction joints, and it is not advisable to set up more construction joints to facilitate the integrity of the foundation. During construction, it is necessary to take appropriate measures according to the construction season to avoid shrinkage cracks during concrete pouring.
(5) Settlement observation points should be embedded in the four corners of the foundation exposed to the ground.
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