Create a good construction environment to eliminate pneumoconiosis

Pneumoconiosis is a crippled occupational disease without medical end. Pneumoconiosis patients with chest tightness, chest pain, cough, cough, exertional dyspnea, colds, decreased respiratory function, seriously affect the quality of life, but also the condition is upgraded every few years, co-infection, and finally pulmonary heart disease, respiratory failure and death, There is no specific drug treatment for this. More than 720,000 pneumoconiosis patients have been reported in the country. About 10,000 new cases of pneumoconiosis are reported each year.

The disease is a systemic disease mainly caused by diffuse fibrosis (scarring) of the lung tissue caused by long-term inhalation of productive dust (dust) in occupational activities and retention in the lungs. 62% of the nation's pneumoconiosis is concentrated in the high-prone area of ​​the coal industry (especially on-site shotcrete support personnel). Once pneumoconiosis is caused by employees, it cannot be cured yet. It is a heavy burden on the patient's family and business! For enterprises, they need to pay a lot of medical expenses and compensation! For patients, it means that the family is broken!

However, at present, the amount of dust in construction sites of all mine tunnels, railways and road tunnels, water conservancy culverts, underground projects, high-rise building foundation pits, and military projects in the country is still large, although some construction companies have equipped construction workers with masks. And other protective equipment, but did not eliminate the problem of dust from its roots, and the constructors are still very vulnerable to illness! Instead of wasting a lot of time and money on protection, it is better to eliminate dust from its roots.

How to minimize dust? This requires the construction unit to change the construction process. It is understood that most of the construction units in mine tunnels, railways and highway tunnels, water conservancy culverts, and slope protection projects still use the dry-jet and tidal jet processes. The construction process is mainly inadequate. The point is: The large amount of dust pollution on the job site affects the safety of production, and it is very easy for workers to suffer from pneumoconiosis! In addition, the cohesiveness of the sprayed material is poor, and the rebounding material is as much as 30∽50%, which seriously affects the quality of the sprayed film. For the sprayed hand, the process not only causes great harm to the body, but also the sprayed material is mixed. When the ratio is not easy to grasp, the arbitrariness of the operation will affect the performance of the material.

Nowadays, people’s awareness of environmental protection has increased and the country's policies have been introduced. As well as improving the quality of shotcrete, more and more wet concrete jets have been put into use. At present, the most representative wet sprayer on the market is the KSP-9 type concrete wet sprayer and the KBS-8A concrete fine stone pump produced by Henan Coal Science Research Institute Co., Ltd.

The main advantages of this type of wet sprayer are:

(1) The concentration of dust on the side of the machine and outside the nozzle is greatly reduced, which effectively reduces the harm to the health of workers.

(2) Productivity is high. Dry concrete jets are generally not more than 5m3/h. Wet concrete shoters can be used for manual operation up to 6∽10m3/h.

(3) low rebound, dry spray, the concrete rebound rate of up to 30% ∽ 50%. With wet spray technology, the rebound rate can be reduced to less than 10%.

(4) When wet spraying, the water-cement ratio is easy to control and the degree of hydration of the concrete is high, so the quality of shotcrete can be greatly improved.

By contrast, it is clear that the traditional dry spray process is outdated and can not meet the needs of safe production, but also a great harm, and the wet spray process fundamentally solves the unfavorable factors that endanger the health of workers, so the wet spray process is ultimately required Alternative dry spray process.