Safety technical requirements for deep hole pre-split blasting above 10m

Safety technical requirements for deep hole pre-split blasting above 10m

[Procedures] Article 353 In the solid coal of the mining face of high gas and prominent mines, deep hole pre-cracking controlled blasting of more than 10 m for increasing coal body cracks and loosening coal bodies may be used. The secondary coal mine permits the use of explosives and develops safety measures.

[Executive Note] In order to prevent the occurrence of deflagration, it is necessary to use a water-type coal mine permit explosive, strictly limiting the single-hole charge. Before the mine allows the use of the millisecond detonator, it must be inspected beforehand. The layout of the blasthole, the depth of the blasthole, the amount of charge, and the order of initiation must be strictly enforced. Since there is coal slag in the blasthole and is affected by the ground stress, when the blasthole drill pipe is pulled out, the hole is drilled by the boring tube, and the depth of the blasthole is recorded, and the quantity and length of the charge are determined. . In order to ensure the reliability of the interval charge of the elongated drug roll or the continuous charge detonation, it is necessary to lay a permitted detonating cord for the coal mine along the entire length of the hole in the blasthole. The length of the blasthole seal is subject to the provisions of Article 359 of the Regulations. Blasting strictly enforces the "one gun and three inspection system" and the "three-person chain blasting system." Before blasting, the blaster must do a full resistance check on the electric blast network. In order to prevent the delay from protruding, wait at least 20 minutes after blasting before entering the work surface. There must be safety protection measures such as evacuation, power outage, warning, long-distance blasting, and reverse damper. After the pre-splitting blasting of the mine mining face, the operation is stopped for 4-8 hours. The evacuation and blasting distance are determined according to the degree of outstanding danger, generally not less than 200m, and the evacuated personnel should be in fresh airflow.

Use 1

Wooden Kitchenware Chopsticks

We are the manufacturer of disposable Wooden Tableware integrating production and sales. Mainly operating Disposable Chopsticks, toothpicks, knives, forks and spoons,spork,ice cream sticks,ice cream spoons, coffee sticks etc productions.The material is made from the birch and poplar. Our products are well popular by customers and are applied in the company, restaurants and families etc place.

From logs to finished products are produced by our company.From the source to control the quality of products and to provide customers with peace of mind products.

Companies adhere to the principle of integrity and mutual benefit to provide customers with the best quality service and the most affordable prices.


And our tableware is disposable so customers very like its convenience.

First of all, the biggest benefit of using Disposable Cutlery is convenience. You will find that the overall convenience of using cutlery is that it can be used without cleaning or other work. For us, this is a level of convenience that is almost impossible when we choose to use other cutlery. Really consider the advantages of this aspect and then go to better use is a big enough guarantee.

Secondly, another advantage of Disposable Tableware is that it is very clean. Compared with the traditional tableware, this product is only disposable so it can really guarantee the overall cleanliness and hygiene, there will be no first cleaning or disinfection work is not in place, thus affection our future use. This aspect of the problem is completely non-existent for us.


FAQ:

Q1: Are you manufacturer or trading company?

A1: We are manufacturer.

Q2: What is the material of products?

A2: Natural Birch.

Q3: How long will you deliver the products?
A3: 30~60 days after receiving 30% T/T deposit.

Q4: What is the payment term?
A4: T/T 30% as deposit in advance and balance 70% should be paid when goods ready to ship or L/C at sight.

Q5: Do you provide samples?

A5:Yes, free samples available.

Wooden Kitchenware Chopsticks,Disposable Wooden Kitchenware Chopsticks,Wooden Kitchenware Chopsticks Set,Disposable Kitchenware Chopsticks

Dalian Yongtailong Wood Industry Co.,Ltd , https://www.ytldisposablegoods.com