The NETIS registered lubricant is this product only. It is a gel-like lubricant that reduces friction between the structure and the ground in pipe jacking, shield, and caisson methods. It suppresses friction regardless of soil type, from aquifers to dry layers.
This agent is a filler with a unique DDS (Drug Delivery System) function that steadily releases slippery components over an extended period. It enables long-term maintenance of low thrust, not only in water-bearing layers but also in anhydrous layers, which have previously been considered difficult to manage.
Ⅰ. Thrust increase mechanism of general lubricants
Ⅱ. The thrust reduction mechanism of Conjac
Application site
Pipe JackingCaisson ConstructionCasing Shaft
Explanation video
Packaging Type
Conjac 300
Conjac 700
Net Weight
6 kg
9 kg
Package Style
1.2 kg per bag × 5 bags, packed in a cardboard box
1.8 kg per bag × 5 bags, packed in a cardboard box
Finished Quantity
1,000 L
1,000 L
Packing Style
Cardboard box
Cardboard box
Applicable site
Caliber
Distance
Soil type
Small
Middle
Big
Short
Middle
Long
Clay
Sand
Gravel
Conjac 300
○
○
△
○
○
△
○
○
△
Conjac 700
◎
◎
◎
◎
◎
◎
◎
◎
◎
◎Excellent, ○Good, △Fair
How to use
Pour 199 L of clean water into the mixer.
While stirring the mixer, gradually add one bag of Conjac in small amounts. Stop stirring after 15 to 20 minutes. (Do not stir for more than 20 minutes.)
Prolonged exposure to direct sunlight may affect the lubricating effect, so it is recommended to cover the mixer with a lid.
Cumulative construction distance
Calculation of Jacking Force
We calculate the jacking force at your site using the jacking force reduction coefficient derived from the construction performance of the Conjac. Please feel free to consult us first.
Example of Jacking Force Calculation for the Slurry-Type Pipe Jacking Method
#1 Construction of an S-shaped curve in a dry gravel layer
Pipe diameter
φ800 mm
Extension
380 m
Soil type
Anhydrous gravel
Construction method
Slurry type pipe jacking method
#2 Large diameter long distance construction
Pipe diameter
φ3000 mm
Extension
500 m
Soil type
Sand
Construction method
Slurry type pipe jacking method
#3 Ultra-large diameter construction
Pipe diameter
φ3500 mm
Extension
200 m
Soil type
Sand silt
Construction method
Earth pressure type pipe jacking method
#4 Long-distance construction near the coast
Pipe diameter
φ1000 mm
Extension
480 m
Soil type
Sand
Construction method
Slurry type pipe jacking method
#5 Ultra-large diameter BOX construction
Pipe diameter
□5 m×6 m
Extension
22 m
Soil type
Sand
Construction method
Pneumatic caisson
Frequently asked questions
Is it effective even in a dry gravel layer (a stratum without groundwater where the lubricant is absorbed into the ground and lost)?
It enables long-term maintenance of low jacking force not only in aquifers but also in dry gravel layers, which have been considered challenging until now.
The groundwater has a high salinity concentration. Would this still be acceptable?
Please send 1–2 liters of groundwater to our company before starting construction. We will propose the most suitable lubricant for each site.