Space frame type dry coal shed (part 1)

Construction of space frame dry coal shed in a power plant is divided into phase one and phase two. The first phase of the project is 104 meters in length, 75 meters in span, 37.5 meters in height, with an expanded area of 12,253 square meters and a projected area of 7,800 meters. Phase II: 113.4 meters in length, 75 meters in span, 37.5 meters in vector height, 13,360 square meters in unfolded area and 8,505 square meters in projected area. The dry coal shed is a semi-circular double layer lattice structure. The space frame is in the form of quad-pyramid structure, and the joints are welded bolt balls. The space frame dry coal shed constructed in two phases of the power plant is shown in Figure 1.

FIG. 1  Space frame dry coal shed of a power plant

Figure 2 Space frame model

Space frame structure form
1) Space frame structure
The space frame structure of dry coal shed is a combination of forward releasing and evacuated quad-cones. The two ends of the space frame are put in square cone structure and the middle part is evacuated square cone structure. The plane expansion of the space frame of the second phase dry coal shed is shown in Figure 3. The space frame structure composed of quadrangle cone, its basic unit is composed of 4 chords, 4 inclined bars of the positive quadrangle cone, namely pentahedron. Cones can be either anterior upside down. When these four pyramidal structures are arranged to form a space frame, the adjacent cones are connected with an upper chord or a lower chord. According to the combination of the cone and the direction of the chord connecting the cone top, these four cones can form different space frame structures. Composition is put four pyramid space frame of the four cone bottom edge is parallel to the boundary or vertical, pyramid spread throughout the space frame plane, bottom chord node on the space frame is suitable (down) at the apex of the pyramid, can also be used as the Angle of the inverted pyramid, making tongfang upward, lower chord plane projection for just two sets of parallel lines, each half of the space frame spacing. If the translation value of the upper and lower strings is changed, or the upper and lower strings are rotated relative to each other, and some corresponding strings are taken out appropriately, various forms of quadrangle truss can be obtained. The upper and lower nodes of the square pyramid space frame are respectively connected with 8 rods, and the structure of the nodes is relatively uniform.

FIG. 3 Expansion diagram of phase II space frame dry coal shed

The four ventral rods and the corresponding four lower chord rods of the cone are drawn by jumping on the basis of the four ventral rods of the cone. Make the size of the lower chord space frame twice that of the upper chord space frame. Generally speaking, the number of rods of this kind of space frame is small, and the total number of belly rods is about 3/4 of the total number of belly rods of the four-angle cone space frame, and the lower chord rod is reduced about 1/2, so the structure is simple and the production cost is low. No change in the upper chord, no evacuation, easy to lay the roof.