Architectural & Structural Engineering
Intelligent Structure Jacking & Movement
CTCI REI is Asia’s most experienced provider of structure jacking and movement services. Our team utilizes an exclusive Computer Control Synchronous Jacking System (CCSJS) to save customers time and cost by minimizing interruptions in their business operations and extending the service lives of their structures.
- Renovation on Deformed Oil Storage TanksDescription
In this case, a 100,000 kiloliter oil tank (88.4m in diameter and 20.7m in height) suffered differential subsidence at the bottom, which caused wall plate deformation, and floating roof jam . This lead to a decrease in oil storage level to a height less than 9 meters; lower than 60% of the designed amount. CTCI REI utilized our patent -“Floating Roof Oil Tank Subsidence Repair Method” to repair the deformed oil tank by using Computer Control Synchronous Jacking System (CCSJS). The repaired tank recovered the oil storage height from 9m to 16m, and the tank storage returned to its operation level.
Before jacking, 3D laser scanning was implemented to profile the deformed condition of tank wall. The data was then input to perform finite element analysis to analyze the stress distribution of the wall and subsidence curve at the bottom tank in order to find out the optimum jacking curve and process. The results were then used by the Computer Control Synchronous Jacking System (CCSJS) which can simultaneously operate 128 sets of jacks to guarantee structure safety when jacking. iSJM is the best solution to extending oil tank service life.
- Restoration of Steel Shop SubsidenceDescription
This case consists of 12 consecutive large-scale steel structure workshops which suffered severe subsidence resulting from interior construction and excavation and the long-term stacking of high-tonnage steel coils. The subsidence further caused great mis-alignment of the bridge cranes; buffer plates were then over-used to adjust the alignment, affecting the overall structure safety and crane operation safety.
CTCI REI utilized the Intelligent Structure Jacking & Movement (iSJM) method to repair the shops without affecting the shop’s structure safety and operation, restoring the crane rails height angle variable back to 1/1000.
14 columns in the shops were jacked and adjusted. By using precise computer control system, the columns were jacked consecutively, and the buffer plates under the crane beams were removed simultaneously to ensure the structure loading was evenly distributed, in order to safely reach expectations. The whole project was completed in three days. Intelligent Structure Jacking & Movement (iSJM) method not only ensures structure safety, but also minimizes the effect on the business’s operation
- Restoration and Reinforcement of Public Pipe Racks in Coastal AreaDescription
The public pipe rack referred to in this case was built on reclamation ground. About 1/3 of the near 9 kilometer-long pipe rack is adjacent to large facilities, resulting in excess differential subsidence.
CTCI REI used the Intelligent Structure Jacking & Movement (iSJM) method to perform the repair. After repair, both sides of the rack were restored to the designated height.
Jacking in this case was performed in separate stages and by using precise computer control lifting sequences. Each stage of jacking was controlled to have an error tolerance of less than 1mm. This process ensures that the pipes and pipe rack loading was evenly distributed for structure safety concerns. Meanwhile, the foundation was reinforced in consideration of earthquake and typhoon loading regulations.
- Historic Site Relocation: Taipei Railway Factory (Built in 1909)Description
The Taipei Railway Factory, a one-story historical brick building (length 26m, width 24m) was built in 1909. Due to the confliction with the MRT construction project and in consideration of both historical building preservation and major public constructions, CTCI REI utilized the Computer Control Synchronous Jacking System(CCSJS) to move Taipei Railway Factory 28 meters southwest to a temporary location for preservation. It would be moved back to its original location after MRT construction is completed.
Before jacking, inner and outer steel structures were installed to support and protect the brick building. The building then was moved by minimal jacking in multiple stages coordinated by automatic monitoring. After the foundation was jacked up to 1.5m, steel rails and 34 moving devices were placed. The process took 10 working days, and the moving distance per day was 2-3 m. Slowly, the ancient and fragile building was moved to its designated location without any damage.
- Roof Lifting of Steel Structure Shop in ThailandDescription
In this case, the current height of a 1200m2 (50mX24m) large workshop wasn’t suitable for new equipment specifications. In order to fix the problem, the 106-ton roof was lifted 1.6m, and 12 steel columns were extended to support the lifted roof. The structure was then able to meet the operational requirement.
The 12 roof-supporting columns of the shop structure were lifted by using precise computer control. The steel columns were jacked up simultaneously stage by stage to ensure the structure loading was evenly distributed for safety concerns. The process of the work from design, and prefabricated installation, to the completion of lifting took about 50 days. The lifting process itself took only about 3 days. The structure was then reinforced and examined after lifting to guarantee safety.
- Press-in Caisson used for Underground ConstructionDescription
The traditional caisson installation method has an uneven loading problem which further causes structure deflection and the subsidence of adjacent ground. To deal with this issue, CTCI REI developed a Press-in caisson method which was suitable for limited space. It evenly distributed loading, decreased the effects of lowering underground water, and shortened the construction period. CTCI REI utilized this method in this project with two press-in caissons (LWH: 25m x 15.5m x 31.3m and LWH: 15.5m x 11.5m x 28.5m) and had successfully shortened the construction period and saved the construction budget by 25 million NTD.
According to design, the ground anchor is used as the reaction force of the jack to press the load. The Computer Control Synchronous Jacking System (CCSJS) was used for each press, and calibration was made every 30cm to ensure the vertical deviation maintains less than 1/300 during construction.