Why are the quality and prices of reinforced concrete pipes so different?

introduction

Reinforced concrete drainage pipes are the latest type of drainage and water delivery pipes, and are currently the most widely used non-metallic composite pipes. They are suitable for the erection of gravity circulation pipes such as urban roads, rainwater, sewage, water diversion and farmland irrigation.Due to the uneven development of domestic regional economies, there is a large gap in the development of the drainage pipe industry in various regions. Problems such as backward production equipment, uneven product quality, and shoddy products have affected the healthy development of the industry. So why are the quality and prices of reinforced concrete pipes so different? The editor will take you to analyze from the aspects of raw materials, production technology, labor costs, etc.

1. Selection of raw materials

1, cement selection

As the main material of high-quality reinforced concrete pipes, cement is generally selected from well-known groups such as BBMG and Jidong.PO42.5Ordinary Portland cement has stable quality and higher price than small manufacturers50-80Yuan/tons, based on daily dosage100Calculated in tons, the daily difference is5000-8000Yuan, the annual cost is more150-240Ten thousand.

2, steel selection

    The steel materials selected for high-quality reinforced concrete pipes are generally national standard wire rods from Jiujiang, Anfeng and other groups. They are cold-drawn from the base metal and are completely in accordance with the national standard specifications. The quality requirements are "no difference". Steel from small factories is not used. The quality of small steel factories is not up to standard, and there is a difference. Low per ton300About RMB 1,000, based on daily dosage10tons calculation, daily difference3000About RMB 1,000,000, the annual cost is more90Around 10,000.

3,Selection of sand and gravel

High-quality reinforced concrete pipes use high-quality water-washed medium sand and do not use stone powder or inferior sand or stone powder.60Yuan/tons, poor quality sand75/tons, high-quality washed medium sand105Yuan/tons, difference30-45Yuan/tons, based on daily dosage200tons calculation, daily difference6000-9000Yuan, the annual cost is more180Ten thousand-270Around 10,000.

2. Production process

1, Brand new mandrel vibration and radial extrusion production technology

①High overall coefficient;

②High density and not easy to leak;

③Inner diameter standard;

④Good environment and low labor intensity;

⑤High specifications and daily output to ensure construction progress.

2, backward hanging roller technology (elimination)

①The production safety factor is low and can easily cause casualties;

② Poor density and easy to leak;

③The inner diameter deviation is large (the inner diameter decreases);

④Poor production environment and high labor intensity;

⑤The output of a single specification is low and can easily affect the construction progress.

3. Labor costs

In addition to the cost of production personnel, excellent reinforced concrete pipe manufacturing companies must not have any flaws in quality control. Professional quality inspection personnel are required to conduct layer-by-layer inspections in raw material inspection, skeleton processing, proportioning use, product molding, and finished product delivery to ensure that product quality meets standard requirements. After the products arrive at the project, technical personnel and business personnel must also promptly follow up on site construction instructions. After construction is completed, technical personnel will perform closed water tests on site throughout the entire process.

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