Non-grooving construction refers to the construction method of laying or pouring pipelines (drains) in holes excavated under the ground along the pipeline. There are pipe jacking method, shield tunneling method, shallow burying method, directional drilling method, ramming pipe method, etc.

(1) Closed pipe jacking:

Advantages: high construction accuracy. Disadvantages: high cost.

Scope of application: water supply and drainage pipelines, integrated pipelines: applicable pipelines.

Applicable pipe diameter: 300-4000m. Construction accuracy: less than ±50mm. Construction distance: longer.

Applicable geology: various soil layers.

(2) Shield method

Advantages: fast construction speed. Disadvantages: high cost.

Scope of application: water supply and drainage pipelines, integrated pipelines.

Applicable pipe diameter: above 3000m. Construction accuracy: uncontrollable. Construction distance: long.

Applicable geology: various soil layers.

(3) Shallow buried construction pipe (tunnel) road

Advantages: strong applicability. Disadvantages: slow construction speed and high cost.

Scope of application: water supply and drainage pipelines, integrated pipelines.

Applicable pipe diameter: above 1000mm. Construction accuracy: less than or equal to 30mm. Construction distance: longer.

Applicable geology: various formations.

(4) Directional drilling

Advantages: fast construction speed. Disadvantages: low control accuracy.

Scope of application: flexible pipes.

Applicable pipe diameter: 300mm—1000mm. Construction accuracy: no more than 0.5 times the pipe inner diameter. Construction distance: shorter.

Applicable geology: Not applicable to sand, pebble, and water-bearing strata.

(5) Tamping tube method

Advantages: fast construction speed and lower cost. Disadvantages: low control accuracy.

Scope of application: steel pipe.

Applicable pipe diameter: 200mm—1800mm. Construction accuracy: uncontrollable. Construction distance: short.

Applicable geology: water-bearing stratum is not suitable, sand and pebble stratum is difficult.