Construction Hoist (also called Building Hoist, Passenger Hoist, Construction Material Hoist, Construction Passenger Hoist) are an efficient and safe means of transporting people and materials on construction site. They help increase productivity and safety, thereby saving time and money.
Construction hoist is vertical transport machinery driving by pinion and rack, mainly used on construction site for transportation of personal and materials. As a permanent or sub-permanent external elevator, it also applies to store house, dock, high tower, high chimney, etc. There are single cage and double cages hoist. According to the need gets rid of one cage of double cages the hoist will be changed to single cage hoist. SC construction hoist is equipped with reliable electrical and mechanical safety device. It is efficient and safety vertical transporting equipment.
BQ supplying general building hoist, VVVF speed building hoist, modern energy-saving building hoist and other types of building hoist.
Construction Material Hoist,Vfd Construction Hoist,Sc Construction Hoist,Vfd Control Construction Hoist,Construction Passenger Hoist SHEN YANG BAOQUAN BUSINESS CO., LTD , https://www.sytopkittowercrane.com
Smooth blasting is to drill a row of (circle) dense blastholes on the contour or excavation edge so that the resistance line is larger than the hole spacing. When blasting, a rupture zone is formed along the blasthole line to obtain a flat rupture surface. Generally, smooth blasting is initiated once after the main blast hole is blasted or after cleaning. After smooth blasting, the forming is regular, not over-excavating, meeting the design requirements, the new slope is not damaged, and the stability of the step is guaranteed.
The smooth blasting mostly uses uncoupled charge. The open blast and underground mines use this blasting method in the field work. The schematic diagram of the typical scheme is shown in Figure 1 and Figure 2.
Figure 1 Typical plan for smooth blasting in open pit mines,
Fig.2 Schematic diagram of the arrangement and detonation sequence of the smooth blasting hole in the underground roadway
The charge of each blasthole in rows 1, 2, and 3 is 108kg, 90kg, and 72kg, respectively.
It is necessary to explain that the smooth blasting construction process must be strictly in accordance with the design requirements to ensure the blasting effect.