Equipment
Collapsible mobile formwork
A unique auxiliary system for construction of new pipelines and replacement of old pipelines by new ones, followed by installation of reinforced concrete rings.
Application:
- The OR-1.5 formwork is designed for operation as a site for the equipment of the MNB-50 machine and for protection of personnel and equipment against soil collapse
- The inner dimensions of the formwork are designed for installation of reinforced concrete rings for wells, having diameters up to 1.5 m.
The OR-1.5 formwork provides safety of operation and minimal scope of excavations for work at high depth.
Operation principle

Reinforced concrete rings are installed inside the formwork.
Two hydraulic cylinders, with the load-bearing beam resting on a reinforced concrete ring, are used to lift the formwork belts.
With the formwork belts extension, fill-up soil is used to fill resulting spaces between rings and the formwork.
This is followed by installation of the next ring.
Then the procedure is repeated.
Specifications:
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Using the MNB-50 equipment for a pipeline construction, followed by using the OR-1.5 formwork
for the reinforced concrete well installation: description of stages
Step 1 The first belt of the OR-1.5 formwork is placed on the axis of an old pipeline that must be replaced, or the new pipeline must be constructed, with the pipe-jacking method used for this purpose. | Step 2 Soil excavation is carried out within the formwork gradually sinking it to the designed depth. | Step 3 The MNB-50 equipment is mounted in the OR-1.5 formwork. |
Step 4 Works are carried out for pipeline replacement or laying from the OR-1.5 formwork. | Step 5 Construction of the reinforced concrete well, Ø1500 mm | Step 6 The load-bearing beam, resting on the reinforced concrete ring, applies force through the set of hydraulic cylinders to press the formwork up from soil by one belt height. |