1.Directional drilling technology

The trenchless pipeline laying technology of directional drilling refers to a trenchless technology using the rock and soil drilling and excavating equipment and directional driller to drill the pilot hole, expand and clean the hole, and pull back the pipelines and completing diversified underground public pipeline laying under the condition of not trenching the ground surface. 

Technical advantages:

1. Small influence on above-ground facilities related to environment and traffic;

2. Accurate orientation, speediness and efficiency;

3. Low cost, less land occupied and short construction duration;

4. Underground barriers can be bypassed with the exploration depth reaching tens of meters fit for the construction in complicated terrains.

Representative projects:

water supply crossing projects in the Jiulong River, Fujian; Yujiang River, Guiping, Guangxi; Longchuan River; Danjiangkou Reservoir, Hubei; Weihe River, Shaanxi; Xi'an International Horticultural Exposition, etc.

2.Mechanical pipe-jacking

Mechanical pipe-jacking refers to a concealed construction method adopted during the tunnel or underground pipeline crossing diversified barriers, such as railways, roads, rivers or buildings.

Technical advantages:

a. Wide available scope of strata;

b. No need for exposed excavation of earthworks with little influence on the ground;

c.Less equipment, simple procedures, short duration, low cost and fast speed;

d. Applicable to medium and large-sized pipeline construction with the maximum diameter of 4-5m;

e.Pipeline laying available in very deep underground.

f.Round jacking or abnormal shaped channel, such as rectangular pipe-jacking.

Representative projects: 

Sewage Pipe-jacking Project in Xining Huangshui Road; Rectangular Pipe-jacking in West Linhe Road; Jacking Culvert Project in New City Region of Huizhou; Rectangular Pipe-jacking Project in Pedestrian Passageway of Metro; and Power Tunnel Pipe-jacking Project

3.Comprehensive pipe gallery technology:

the comprehensive pipe gallery refers to the structures and subsidiary facilities constructed underground in cities, and used for accommodating urban engineering pipelines in two categories and above, which mainly applied in the uniform operation and management for all pipelines in new urban areas and also the reconstruction of pipe ditches in some old urban areas. The technologies of mini shield, tunneling and special-shaped pipe-jacking can satisfy the requirements of comprehensive pipe gallery with huge advantages in fast construction speed, no need in excavation and crossing barriers at the same time.