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Quick Details

  • Place of Origin: Hunan, China (Mainland)
  • Brand Name: Zhongwei
  • Model Number: ZWC-D
  • Diameter: 680/600mm, 880/800mm, 1080/1000mm, 1280/1200mm, 1600/1500mm
  • Material: Q345B / 16Mn / 35CrMo / 25CrMo
  • Applied technique: Welding as usual, casting or forging as customers' demand
  • Application: For rotary drilling rig / oscillator
  • Applied formation: For unstable stratum / formation
  • Error: 3-5mm, mini error range, small error range, small random error
  • Certification: CE, ISO, CNAS, GS, CQC, IAF
  • Manufacuturer: Made in China, Chinese supplier/factory/manufacturer
  • Product name: Double Wall Casing Tube For Unstable Stratum
  • Key word: casing, double wall casing, double wall casing tube

Packaging & Delivery

Packaging Details 1. Wrapped with plastic film.
2. Fixed with iron support or pallet when necessary.
(3. Packed with wooden cases for small things.)
Delivery Time 7-15 days

Double Wall Casing Tube For Unstable Stratum


1. Parameter

Heavy casing (grab full casing)
TypeOD/IDJoint ThicknessDouble-wall thicknessSingle-wall thicknessLength


Light casing (drilling rig full casing)


2. Brief Introduction

The use of powerfull rotary drives or the use of oscilators requires the application of heavy duty casings. We offer two types of casings; Double-walled casings and Single-walled casing
Double walled casings can be used universally, as they are designed especially for transmitting high rotational and vertical forces as created by the rig rotary drives or oscillations .
The use of double walled casings ensures a flush drill string.
Single walled casings can be used for applications where weight reduction is important.

Double-walled casing and Single-walled casing can be drived by 

- Rotary Drilling Rig; Casing Rotator; Casing Oscillator; Vibratory Hammer,etc

3. Application:

- Suitable for drilling in sand, sludge, cohesive soil, marl, soft rock(like claystone);

- Suitable for concrete in secant pile wall, hard soil, cobbles, gravel, rock;

- For karst cave, boulder, inclined pile; 

4. Type

a). Single-walled casing

b). Double-walled casing

* Other types can be manufactured as per customers' demand.

5. Accessories

a). Driver: to connect the machine;

b). Joint: to connect each two casings or casing and driver or casing and shoe;

c). Shoe: the bottom part to cut into the soil;

d). Bolt: to fix the male and female joints;

e). Teeth: to cut the soil; WS39, WS20, etc.

6. Tips

a). The pipe casing should avoid to the collision, especially of casing joints knock against

when install the casing bolts, it must be clean, otherwise it will cause the difficult installation 

b). The drilling bucket needs to be chiseled in advance when pile casing drives the increased

torque to diffcult

c). The drilling bucket needs to be checked position and verticality of hole, to avoid opening

the door at the hole bottom when lift the drilling open and closed against to casing shoes

d). You must be tested all movements of pulling machine normally before concreting

Pull up pipe casing immediately to prevent steel trunk floating after the end of grouting

Packaging & Shipping

A. Packaging

1. Wrapped with plastic film

2. Fixed with iron support or wooden case or Iron case

B. Freight

1. Ocean shipping as usual

2. Air freight or land freight as customers' special demand

3. Land freight to inland countries.

C. Port

1. Changsha Port for FCL as usual

2. Tianjin or Shanghai or Shenzhen Port for LCL or bulk cargo as usual

3. Any port in China as customers' special demand



Company Information

A. Company

Established in 2008,  Xiangtan Zhongwei Heavy Industry Co., Ltd. is an advanced technological company that specializeds in the R&D, manufacture and sales of various drilling tools, attachments and spare parts.

1. 102 employees (5 engineers)

2. Technical adviser: Dr. Liu Jinggang from Xiangtan University 

    Professor Tang Huanqing from Hunan Institute of Engineering  

3. Supported by State Innovation Found 

4. A member of Hunan Drilling Mechinery Club




B. Products

1. single/double bottom sand drilling bucket with bullet teeth or flat teeth

2. bullet teeth or roller bit core barrel

3. belling bucket/clam drilling bucket/clean out bucket

4. conical or cylindrical auger/CFA auger

5. round shank chisel/flat teeth/roller bit 

6. interlocking or frictional kelly bar

7. single/double wall casing pipe

8. tremie pipe

9. steel wire rope

10. pile breaker



C. Customers

With a group of engineers and skilled workers with years of experience in engineering and construction design, our products are widely recogized and trusted by users. In the domestic market, we are the main supplier for Sany, XCMG, Zoomlion, Yutong, Sunward and Foton. In addition, our products are widely exported to the USA, Nea Zealand, Australia, Brazil, Souteast Asia, Middle East, Brazil, Russia and Afica, etc.




Our Services

 A. Procedure

--- OEM or customized products

--- Track the production

--- Arrange for inspection if needed

--- Take photos before delivery

--- Arrange for customs clearance

--- Track the shipment

--- Send related files to customers

--- Track quality problems if any

--- Collect suggestions from customers

B. Certificate

Certificate of origin, CO

GSP certificate of origin, FORM A

China - ASEAN Free Trade Area Preferential Certificates of Origin, FORM E

Asia-Pacific Trade Agreement Certificate of Origin, FORM B

China and Pakistan FTA Certificate of Origin, FTA
China - Chile FTA Certificate of Origin, FORM F
China New Zealand Free Trade Area of origin, FORM N
China - Costa Rica Free Trade Agreement Certificate of Origin, FORM L
China - Peru FTA preferential certificate of origin, FORM R
China - Singapore FTA Certificate of Origin, FORM X
Taiwan certificate of origin certificate, ECFA

C. Trade Assurance Service by Alibaba 

It can effectively protect your rights: Quality and delivery time of goods, your financial security.

For more infomation, please visit:




Contact us

Welcome your call or email ~~~

M: 86-15773205067  or  M: 86-15575893122

P: 86-0731-58535812  |  F: 86-0731-58535989

Email: wrdcb@foxmail.com


         tanannica             annicatan        8615575893122


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