800/720mm Double Wall Casing with Bauer-Screw Joint Used Bauer-Bg28 Rotary Drill
详细信息
800/720MM double wall casing with bauer-screw joint used bauer-bg28 rotary drill rig for cased bored pile foundation work800mm double wall casing pipe with bauer-screw joint used on bauer-bg24 rotary drill rig for secant pile foundation work
800mm casing oscillator use heavy duty double wall casing used on bauer-bg26 rotary drill rig for cased bored pile foundation work
800/720mm double walled casing with bauer-screw connections used on bauer-bg33 rotary drill rig for drill shaft construction
800mm forge joint double wall casing with bauer-screw joint used on bauer-bg36 rotary drill rig for cased bored pile foundation work
800mm segmental casing pile with bauer-screw joint used on bauer-bg20 rotary drill rig for secant pile foundation work
800mm casing rotator use heavy duty double wall casing used on bauer-bg40 rotary drill rig for bored pile foundation work
The joints are made of 25CrMo forgings, which are wear-resistant and not suitable for deformation. The pipe body is Q345B, bolt 42CrMo material, high strength, high torque resistance. The joint bolts are double-row holes. Longer and thicker joints, suitable for high torque drilling
double walled Casing are used to stabilize the borehole wall and to maintain the verticality or to maintain the required angle in the case of inclined drilling, casings are double walled and are offered in various diameter and length ,when use casing oscillators or casing rotators , cased boreholes of more than 80m can be installed
Casings are available in lengths of 1m,2m, 3m, 4m,5m, 6m
Other diameters available on request
Cutting shoe with exchangeable blocks
exchangeable blocks have the advantage that they can be quickly replaced during operation without altering the cutting geometry of the cutting shoe , the overcut can be altered depending on the various types of teeth
Available in the following length 0.5m.1m.2m
Cutting shoe with weld-on blocks
Casing drivers
The casing driver is attached to the cardan joint on the rotary drive and is the connecting element to the casing , if the casing drive and the casing are bolted , the casings can be rotated or extracted
Available range of diameters 620 to 2,500 mm
Featurs
Tianjin Huachang Xingye Technology Co., Ltd. (often operating under the brand TJ Drilling) is a major Chinese manufacturer specializing in foundation drilling tools. Their double-wall segmental casing is widely used in global markets and is compatible with major rig brands such as Bauer-bg, Soilmec, Casagrande, San-y, and XC-MG.
Below are the detailed technical specifications and features for their double-wall casing systems.
1. Technical Design & Materials
TJ Drilling focuses on high-torque resistance and wear durability for deep foundation work in difficult soils.
Joint Material: Precision-forged 25CrMo or 42CrMo alloy steel. These are heat-treated to prevent deformation under the extreme clamping forces of oscillators.
Pipe Body: Constructed from high-strength structural steel, typically Q345B (equivalent to S355).
Internal Structure: The inner and outer shells are connected by high-density longitudinal ribs. For OD 620-1300mm, the inner tube thickness is typically 12mm; for OD 1500-1800mm, it increases to 16mm.
Connection: Conical screw joints with double-row bolt holes to ensure a watertight seal and maximum torque transfer.
2. Standard Specification Range
Their double-wall casings are categorized by the OD/ID (Outer Diameter / Inner Diameter) ratio and are available in lengths of 1m, 2m, 3m, 4m, 5m, and 6m.
| Outer / Inner (mm) | Wall Thickness (mm) | Joint Type | Compatibility Example |
| 880 / 800 | 40 | Bauer-type Screw | Soilmec-SR-40, XC-MG XR280 |
| 1000 / 920 | 40 | Bauer-type Screw | San-y SR285, Bauer-BG28 |
| 1180 / 1100 | 40 | Bauer-type Screw | Liebherr-LRB355 |
| 1200 / 1120 | 40 | Bauer-type Screw | Liebherr-LB28 / LB36 |
| 1500 / 1400 | 50 | Bauer-type Screw | Bauer-BG30, Liebherr-LB45 |
| 1800 / 1700 | 50 | Bauer-type Screw | Large Casing Oscillators |
3. Key Components & Accessories
Tianjin Huachang provides the full "casing string" ecosystem:
Casing Shoe: Fitted with WS39 or B47 carbide bullet bits. The cutting edge is reinforced with welding bars to handle boulders and rock sockets.
Casing Drive Adapters (Twisters): Available with various Kelly box sizes to connect the casing string directly to the rotary head of the rig.
Bolts & Conical Rings: Specifically manufactured 42CrMo high-tensile bolts to lock the segments.
Replacement Parts: They supply the individual male/female forge joints separately for companies looking to repair or manufacture their own casing pipes.
Application Highlights
Casing Oscillators: Their "Heavy Duty" line is specifically reinforced for use with hydraulic casing oscillators (up to 2500mm diameter) where extraction forces are highest.Secant Piles: Due to the high precision of the forged joints, these casings are used for secant pile walls where verticality is critical for overlapping.
