ZDM55 Dual-Wheel Milling & Mixing Drilling Rig

Zhenzhong Machinery ZDM55 dual-wheel milling & mixing drilling rig,

With its advantage of higher adaptability to strata,

it tackled the "hard bone" of Anji's "Two Mountains" Future Sci-Tech City,

Stable performance, high efficiency,

Frequently praised by the construction party!

Stiffened milling and mixing

Good quality of trench wall shape

High vertical accuracy

Fast construction speed

High construction efficiency

Wide range of applications

High-precision verticality

Low construction disturbance

Less spoil and slurry discharge

Large wall depth

▲ Project site

The project is located in Lingfeng Village, Lingfeng Subdistrict, Anji County, Huzhou City, Zhejiang Province, with a total building area of 51,034.82 square meters, of which the underground building area is 17,353.08 square meters.

In this project, the task of the ZDM55 dual-wheel milling & mixing drilling rig is to construct the underground equal-thickness cement-soil mixing water-stop continuous wall before foundation pit excavation. The total length of the water-stop wall is about 730 m, and the wall thickness is 700 mm. On site, it achieves a stable construction task of 15-17 wall panels per day.

Among them, the difficulty of the project lies in the presence of a lot of gravel in the first 6 meters of the construction stratum, with clay mixed in the gravel layer. It is not only highly cohesive but also high in hardness, making it difficult for ordinary drilling rigs to drill down. The ZDM55 dual-wheel milling & mixing drilling rig produced by our company, by arranging reasonable cutting teeth on two high-torque gearboxes, can easily and effectively cut hard strata, improving cutting capacity and construction efficiency.

In addition, the equipment is equipped with a high-precision verticality sensor. During construction, the verticality of the trench can be dynamically monitored by computer, and the deviation-correction system configured on the dual-wheel milling equipment can be used for timely adjustment to ensure wall accuracy. The amount of cement slurry injected can also be precisely controlled by computer, promoting uniform mixing of cement slurry and soil, with good wall uniformity and high material utilization.

Dual-wheel milling & mixing drilling rig

Construction process

The dual-wheel milling deep mixing continuous wall is composed of a series of primary panel walls and secondary panel walls arranged alternately. The so-called primary panel wall refers to the batch of walls constructed relatively earlier, and the secondary panel wall refers to the batch constructed relatively later.

As shown in the figure below, the series with the initial letter "P" are primary panel walls, and the series with the initial letter "S" are secondary panel walls. After the primary panel walls reach a certain hardness, the secondary panel walls are constructed. This construction method is called the "hard milling method".

Process flow

The milling deep mixing method (CSM method) is an innovative underground continuous wall or seepage-proof wall construction equipment that applies the original hydraulic trench cutter equipment combined with deep mixing technology.

It mainly includes: site clearing and material preparation → surveying and setting out → installation and commissioning → trenching and laying plates → machine moving and positioning    → milling, cutting, sinking and mixing, slurry spraying → rotary lifting and slurry spraying → wall completion and machine moving → inserting H-shaped steel piles

Main structure

1. Milling head device

2. Upper clamping and lifting device

3. Lower clamping and pressurizing device

4. Intermediate pulley block

5. Water spraying device

6. Rectangular drill pipe

7. Hydraulic power station

8. Electro-hydraulic control operating system

9. Walking or crawler-type pile frame

10. Backend system

Pile driver parameters

Equipment comparison

Applicable pile types

Water-stop pile

Trench wall reinforcement pile, foundation reinforcement pile

Rectangular secant pile

Foundation improvement

Underground hazardous substance treatment

Special process pile

Applicable strata

Various soil layers, clay layers,

fluid-plastic silt layers, sand layers,

hardened sand layers, quicksand,

gravel layers, weathered rock layers

 Applicable pile diameter / hole diameter

2800x700

2800x800

2800x1000 

Milling hole depth

10M～55.5M

Note: Different milling cutter wheels are selected according to different conditions such as geology, process, and hole diameter.