Composite manhole covers, as one of our products, what are the structural design requirements and specifications that everyone is looking for? Have you been aware of them? Below, the manufacturer of manhole covers will share some insights. We'll delve into both the specifications and requirements!

I. Parameters

1. Test Load: Heavy-duty 400KN, Standard 250KN, Light-duty 125KN.

2. Tensile Strength: Average of 10 MPa

3. Elastic Modulus: Average of 1000 MPa

4. After soaking in sulfuric acid solution for 48 hours, no corrosion was observed on the surface, with a 1% loss in quality.

5. Compression Strength: Average 25 MPa

6. Bend Strength: Average 22 MPa; Impact Strength: Average 10 J/m²

7. Acid Resistance: Sample at 20%

8. Absorption Rate: 1%

Section Two: Requirements

The composite manhole cover structure design must not only meet the requirements of the machinery and equipment itself and the requirements of the mechanical processing technology, but also comply with the casting process requirements. It should facilitate the manufacturing of models, core boxes, and molding.

2. The design of the manhole cover should be as simple as possible for easy molding, and the casting parting surface should be as flat as possible, with a smaller number of parts.

3. The interior cavity of the manhole cover should strive to be cast without or with minimal use of cores. When cores are used, they should facilitate support, fixation, and sand and gas exhaust, with sufficient process holes provided.

For the inner and outer sides of the manhole cover as well as the reinforcing ribs, a certain structural slope should be provided in the mold removal direction.

5. The raised portion on the manhole cover should not significantly differ in height from the composite manhole cover itself, aiming for the same height. For the raised portions that are closer together on the same surface, they should be connected to form an integrated bump as much as possible.

Here is the explanation from the manufacturer of manhole covers regarding the requirements and parameters for composite manhole cover structural design; we hope it is helpful to all.