Surface water treatment measures

First, reasonable determination of wellhead location

The wellhead elevation must be higher than the highest flood level in the local history, or build a solid high platform, or build a reliable drainage ditch and flood control dam near the wellhead to prevent surface water from being poured into the well through the wellbore.

Second, fill the channel

In order to prevent rain and snow from seeping people downhole, measures such as filling pits, filling concaves, leveling the surface or building an impermeable layer are adopted in the mining area.

Third, rectify the river

(1) Finishing the riverbed

A certain section of the river passes through the mining area, and the riverbed is highly permeable, which can cause a large amount of river water to infiltrate the underground. In the lost area, clay, stone or cement is used to build an impervious artificial riverbed to stop or reduce the river water infiltration.

(2) River diversion

For example, near the river flowing people's mining area, you can choose a suitable location to build a dam, cut off the original river channel, and use artificial river channels to bring the river water out of the mining area.

Fourth, build a drainage (cut) ditch

After precipitation in the mountainous area, it will flow into the mining area in the form of surface water or diving. When there is a collapse crack on the surface, the amount of water in the mining area will be greatly increased. In this case, a drainage ditch can be built in the direction of the water flow above the outer edge of the well or the water leakage zone to drain the water out of the affected area.

High Speed Roll Up Door

Material Selection:

1. Frame: 2MM thicknesses cold-roll Stainless steel.

2. Motor: Germany SEW brake motor (outer), power 0.75KW, power supply 220V.

3. Control system: Imported Japan Mitsubishi converter and PLC to control of electric box (150%1HZ)

4. Opening & closing speed: 0.6-1.5m/s (adjustable).

5. Safety Device: Korea Photocell Sensor, emergency stopping reaction when sensing obstacles.

6. Curtain: France high-density polyester fiber and the surface coating processing, thickness 0.8MM, variety colors can be chose: Red, yellow, blue, green, orange, gray, white, transparent, etc. Tensile strength: 4000/3500N/5cm, tear strength 600/600N. Fire-proofing level: German standard DIN75200 Usage temperature: -30 Â° C +70 Â° C.

7. Wind resistant: The Aluminium alloy Reinforce Girder to increase wind resistant effect.

8. Curtain replacement function: Aluminium alloy Reinforce Girder is loaded between 2 pieces Curtain, can be replaced easily if any curtain broken, save your cost.

9. Transparent window: 1.2MM thickness transparent PVC window, size and location is up to your request, more safer.

10. Seal: Seal brush are Installed inside the guides, and the special bottom design, to fit any uneven ground.

11. Cotrolling way: Push button + radar sensor, very convenient.

12. Limiting Switch: Mechanical limiting switch, easily and exactly.

13. Emergency STOP: With emergency stop button on control panel, can stop easily by

Hand once disconnect or accident

14 Fault recovery function: All Hongfa's production is with fault recovery function, system will self-recovery after power cut off.

15. Delivery time: About 7 business days with contract and deposit confirmed.

16. Pyament item: 50% before production, and the other 50% before shipment.

17. Warranty Details: We provide 12 months warranty for all doors and accessories (except man-made disasters, Irresistible natural disasters, ect^).

We have many professional engineers with rich experience, qualified products, perfect service system, and good cooperation relationship with many famous companies.

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SHENZHEN HONGFA AUTOMATIC DOOR CO., LTD , https://www.hongfafrud.com