1\u3001 Overview: A powerful tool for “spatial reconstruction” in old urban areas
\nCompletely feasible. In residential buildings and Ruko (shophouses) on floors 1-3 in Indonesia, using synchronous hydraulic jacking technology to lift the entire house and insert a new floor below is a very mature high-end engineering technology. Especially in areas with low-lying terrain, susceptibility to flood threats, or severe ground subsidence (such as North Jakarta, Semarang, Surabaya), the popularity of this program is increasing year by year.
\n2\u3001 Compared to adding layers upwards, the core advantage of adding layers upwards and downwards is the lifting of the top
\n\u2474. “Zero load” of foundation and structure:
\nAdding layers upwards is to stack on top of the old skeleton, while adding layers downwards is to replace the old house with a ‘new skeleton’. The new floor has an independent foundation (usually a micropile) and frame, and the existing old house only acts as a “load” on top of the new structure, without adding any burden to the original structure.
\n\u2475 Solve waterlogging and subsidence:
\nMany houses in Jakarta have fallen below the road surface due to ground subsidence, and are prone to flooding during the rainy season. During the expansion of the building, the top lift and additional floors raise the house above the flood warning line, completely solving the problem of flooding.
\n\u2476 Synchronize “straightening” correction:
\nHouses in soft soil areas are often inclined. The lifting system can achieve asymmetric lifting and automatically complete leveling during the process of adding floors, allowing the crooked house to regain verticality.
\n\u2477 Doubling commercial value:
\nThe rent and commercial value of the bottom floor are much higher than those of the top floor. Raising the house and inserting a tall hall or shop on the ground floor can result in a very high return on investment (ROI).
\n3\u3001 Safety measures for the entire construction process
\nIn Indonesia, a high-intensity earthquake zone and soft soil environment, safety control must be achieved at the millimeter level
\n\u2474 Early stage: Precision identification and environmental assessment
\nGeological exploration (Sondir Test): It is necessary to determine the depth of soft soil. If there is a thick peat layer below, foundation grouting and solidification must be carried out first.
\nRing Balk Replacement: To prevent the house from falling apart during lifting, a highly rigid temporary reinforced concrete beam system must be constructed at the bottom of the house.
\n\u2475 Mid term: Synchronous control and earthquake prevention (most critical)
\nSynchronous hydraulic system: Adopting PLC computer-controlled synchronous lifting equipment to ensure that the error of the lifting point is controlled within 0.5mm.
\nSeismic Locking: Indonesia experiences frequent aftershocks. At each stage of lifting (usually 20-50cm), temporary steel structure support must be immediately implanted and locked. It is strictly prohibited for the house to be suspended overnight on the hydraulic cylinder for a long time.
\nFlexible connection: Indoor water pipes and wires must be replaced with temporary flexible hoses to ensure continuous water supply, uninterrupted power supply, and no wire breakage during the lifting process.
\n\u2476 Later stage: Perfect integration of old and new systems
\nDeep foundation implantation: The new layer of foundation must penetrate the soft soil layer into the bearing layer to ensure that the newly added layer will not experience further settlement in the future.
\nSeismic joint treatment: Energy dissipation and shock absorption pads should be installed at the connection between new and old structures in accordance with SNI 1726:2019 to prevent collisions during earthquakes.<\/p>\n
4\u3001 Legal compliance and cultural coordination
\nApproval path (PBG&SLF): The addition of floors to the roof belongs to the category of “Renovasi Total”. A new structural verification report must be submitted to the local government to apply for PBG. Due to the improved building safety of this technology, it is usually easier to obtain approval from the Expert Review Board (TABG) than blindly adding floors upwards.
\nCommunity Communication (RT\/RW):
\nThe lifting project looks grand and can easily cause panic among neighbors.
\nExpert reminder: Before construction, it is necessary to invite the RT\/RW team leader to inspect the equipment, demonstrate synchronous control technology, and prove that the construction will not vibrate neighboring houses.
\nCultural etiquette: According to Indonesian customs, a simple Slametan (blessing ceremony) can be held before starting work, which helps reduce neighborhood resistance.
\n5\u3001 Suggestions for scheme decision-making
\nProject indicators: Top up, bottom layer added, traditional top layer added
\nHigh basic security (newly established independent foundation) and high risk (relying on old foundation)
\nDirectly solving flood control and waterlogging without improvement
\nHigh construction difficulty (requires a professional team)
\nThe estimated cost (IDR) is relatively high (requiring precision machinery) and relatively low
\nSignificant asset appreciation (underlying commercialization), generally
\n6\u3001 Summary
\nTop up and bottom layer addition is not only feasible in Indonesia, but also the optimal technical path for increasing the value of old properties and reducing disaster damage.
\nCore guarantee: Non synchronous lifting operations are strictly prohibited (which may lead to collapse).
\nFull house crack monitoring must be completed before lifting.
\nExpert advice:
\nIf you are operating such projects in the northern or coastal areas of Jakarta, please be sure to consider the long-term impact of seawater backflow (Rob). The lifting height should refer to the predicted water level for the next 20 years provided by the local public works bureau (Dinas PU) to ensure a one-time solution to the hidden problem of flooding.<\/p>\n","protected":false},"excerpt":{"rendered":"
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