After the roof accident occurs, the trapped personnel should be rescued quickly and ventilation should be resumed.

First, you should contact the trapped person directly (call, tap, use a geophone, etc.) to determine the location and number of people trapped. If the location of the trapped person is not well ventilated, it is necessary to try to strengthen the ventilation and use the air duct, water pipe, tunneling, drilling, etc. to deliver fresh air, drinks and food to the trapped person. If you are aware of the danger of falling again, immediately strengthen your support and be prepared to make a safe exit. When working in the landing area, you should send someone to observe the changes in the surrounding roof, pay attention to check the gas changes. When removing the falling meteorites, you should use the tools carefully to avoid harming the trapped people. Different salvage methods should be adopted according to the scope of the roof accident and the ground pressure.

Second, the mining process roof coal mining face accident

The trapped person should be rescued first, followed by measures to resume production. The method of treatment should be based on the height of the falling rock formation, the blockage of the falling rock, the location of the roof and the size of the roof. At the same time, it is necessary to take corresponding measures according to the thickness of coal seams and coal mining methods.

1. Local small topping treatment method

It is generally taken to dig the nest beam using one leg or hanging metal shed roof beam treatment.

2, the treatment method of the big top

(1) The whole lane method handles the roof. The scope of influence is not large, the roof area is no more than 15m, and the meteorites that are smashed down are not large. After taking certain measures, they can be handled by hand. The whole roadway method can be used to deal with the roof, that is, the method of restoring the working face.

(2) Open the roadway around the roof area. Generally, when the influence range of the roof is large, it is not suitable to use the whole lane method. The method of opening the roadway to bypass the roof area can be adopted, which is called the method of partially re-cutting the open cut and re-cutting the open cut. There are three situations depending on where the roof area is located on the work surface:

The roof collapse occurs at the end of the working face: the coal can be re-opened from the return air passage along the working face to bypass the roof area. If the area of ​​the roof is large, the meteorite blocks the roadway, causing the accumulation of gas in the return air passage of the goaf, which can be eliminated by temporary windshield or temporary local ventilator.

The roof area is in the middle of the working surface: it can be left parallel to the working surface to leave a 3m-5m coal pillar and reopen a cutting lane. The brackets of the new cut lanes can be determined according to the condition of the roof. Generally, a beam and two column sheds are used.

The roof area is on the head side of the working face: the treatment method is basically the same as the roof area in the tail side of the processor, that is, the coal gang misses a section of 3m-5m coal pillars, and a roadway is made from the wind side to the working surface to communicate with the working surface. .

Third, the handling of roof accidents in the face

Before handling the fallen roadway, the shed and the shed should be used to strengthen the maintenance of the roadway near the roof. While maintaining the roadway, it is necessary to send a special person to observe the roof to prevent the expansion of the roof. There are four methods for dealing with fallen roadways: the raft method, the shed method, the wedge method, and the bypass method.

1. Wood raft method: This is a commonly used method for dealing with fallen roadways. It is generally divided into two treatment methods: “well” word raft and “well” word raft and small shed.

2, take the arbor method: Roof at the falling of the arch height of no more than 1m, and the top caving slate Stone does not continue. When the length of the roof is not large, you can use 5-8 long materials to hang on the two brackets that are intact. This is the shed method. Then, under the cover of the gazebo, the shovel and shed are carried out. After the shed is completed, the top plate is connected with materials on the pergola. This method is not suitable for use in high gas mines.

3, the wedge method: When the roof rock is very broken and continues to fall, unable to clean up the falling objects and the shed, the wedge can be used to treat the fallen roadway.

4. Ways of bypassing: When the length of the roof road is small, it is difficult to handle, and the serious situation of blocking people is caused, in order to find ways to deliver fresh air, food and beverages to the trapped people, and quickly rescue the trapped people, you can take a bypass. The method of bypassing the landing zone for rescue.

Product introduction
Steel Bending Machine, one of steel reinforcement processing machinery.
The working mechanism is a horizontal working disk rotating on the vertical axis. The steel bar is placed in the dotted line position in the diagram. The supporting shaft is fixed on the machine tool.

For bending steel bars of various diameters, there are several holes on the work plate to insert the bending pin shaft, and the center pin shaft of different diameters can be replaced accordingly.

Advantages of characteristics
Applicable to all kinds of round steel, carbon steel, screw steel.
It has strong operability, high working efficiency, convenient Angle adjustment and neat bending
Operation procedures of steel bending machine:

1. Check whether the mechanical performance is good, keep the working table and bending machine surface level;
And prepare various spindle tool blocks.

2. According to the requirements of the diameter of steel bar and bending machine, the core shaft, forming shaft, iron shaft or variable structure shall be installed. The core shaft diameter shall be 2.5 times of the diameter of steel bar.

Check the core shaft, block and turntable shall be free of damage and crack, and the protective cover shall be tightly fixed and reliable, and the operation shall not be performed until it is confirmed that the air machine is running normally.

Iv. During the operation, insert the bend end of the steel bar into the clearance provided by the turntable for fixation, and fix the other end close to the fuselage and press it with your hand to check the fuselage fixation.

The side that actually holds the steel bar can be moved.

It is strictly forbidden to change the spindle, change the Angle, adjust the speed and so on.

When bending steel reinforcement, it is strictly forbidden to process steel reinforcement diameter, root number and mechanical speed beyond the mechanical specification.

When bending high hardness or low alloy steel bars, the maximum limit diameter shall be changed according to the mechanical nameplate, and the corresponding mandrel shall be replaced.

8. It is strictly forbidden to stand in the working radius of the bending steel bar and the unfixed side of the fuselage.
Curved semi - finished products should be stacked neatly, curved hooks should not face up.

When the turntable is turned, it must be done after it has stopped.

X. completion of operation, cleaning of site, maintenance of machinery, power off lock box.

Stirrup Bender

Stirrup Bender,Stirrup Bending Machine,Automatic Stirrup Bender,Rebar Stirrup Bending Machine

Shandong Luteng Building Equipment Co., Ltd. , https://www.lutengmachinery.com