Design skill of nodular cast iron grating。 In addition to the working conditions and the performance of the metal materials, the plan determines the shape and the size of the cast iron grating, but also from the perspective of casting alloy and casting skills, in order to avoid or reduce the composition, deformation, cracking and other defects of the cast iron grating isolation。
The quality determines the price, the quality of cast iron grille should meet the corresponding technical requirements, and the price will be increased accordingly
1. In order to improve the pressure strength of the well ring, the sitting area of the bottom surface of the well ring is increased. When installing the well ring, the diameter in the well shall not be greater than that in the well ring.
2。 The structure of the shaft platform must be brick concrete structure, and must maintain a stable balance。 The well ring and grating can only be installed after the structural force is formed。
3. When installing the steel bar, it is not allowed to suspend under the steel bar. Refer to well ring installation method.
4。 When the ring and grating are placed, the ring and grate bottom concrete (the thickness of concrete shall not be less than 30mm) shall be placed in place when the ring and grate bottom concrete (the thickness of concrete shall not be less than 30mm) are not set。
5。 The load after product installation shall not exceed the specified bearing capacity of the product。
6. Before the wellhead is covered, the sundries in the wellhead shall be removed to avoid the contact between the cover and the wellhead.
7. Open it with a special tool.
8. when the well cover and rainwater grid are not in place, they should be placed in a safe place to avoid rolling.
9. Operate in strict accordance with the above equipment requirements, otherwise, it will not bear any responsibility.
Precautions for ductile iron grille device:
The well diameter of the inspection shaft shall not be larger than that of the derrick。
产品平面与周边地面的相对高度应在-3 ~ +3mm范围内。超出这个范围是错误的。
The relative height between the product plane and the surrounding ground should be within - 3 ~ + 3mm。 It's wrong to go out of this range。
The installation and use of this product should always face up the manhole cover
The edge strip of manhole cover can be pressed with stone or poured with concrete to make the manhole cover fixed without displacement.
In the field construction, our company provides personnel skill guidance device
It is suitable for all kinds of high-end residential buildings, residential areas, squares, pedestrian commercial streets, etc.
General specification: 700 * 700mm, heterosexual specification: according to the field measurement, customized specifications can be divided into single size and combined size.
Advantages: the product does not damage the appearance of the whole ground after the equipment, and it is easy to open, beautiful and generous, corrosion-resistant, and never rusty
The above is a detailed introduction to the requirements of Shandong ductile iron manhole cover for raw materials。 For more information, please click http://www。jnwszy。com