Soil retaining member pull-out simultaneous filling method

basic information

1. Novelty When using temporary materials for soil retention, there is no definitive method to reduce the impact on nearby houses or buried objects during the extraction of soil retention piles (such as steel sheet piles or H-piles), leading to the unavoidable practice of leaving steel sheet piles in many sites. Additionally, in embankment construction where the principle of leaving temporary materials is not permitted, measures such as chemical injection or ground improvement are often considered, but there are structural and cost-related challenges, and particularly effective solutions have been sought. 2. Expected Effects Even under various ground conditions and differences in extraction machinery, it can exert a highly effective suppression effect on the settlement of surrounding ground. According to previous settlement measurement results, the ground settlement at locations 2 to 3 meters away from the extraction point was approximately a few millimeters. 3. Comparison with Conventional Technology Compared to leaving materials in place, there is a cost reduction of 10% to 30% (in cases of steel sheet piles of type 3 or higher and a lease period of less than 6 months). Leaving materials in place can lead to future underground obstacles, and the additional costs in such cases can be substantial. Moreover, in embankment construction where leaving materials is not possible, conventional technology requires measures such as chemical injection to mitigate the impact on surrounding ground before extraction, and those costs can be 400% of the costs of this method (according to NETIS registration information).

Price range

Delivery Time

Applications/Examples of results

【Construction Achievements】 ■ We have accumulated over 260 achievements. 1. Applicable Conditions All steel sheet piles and temporary H-piles used as retaining piles or separation piles can be addressed if they can be pulled out. Steel pipe sheet piles and precast piles can also be applicable after individual case consideration during extraction. 2. Scope of Application (Conditions where it is particularly effective) 1) There is a particularly high demand for steel sheet pile retaining walls in water and sewage construction in densely populated residential areas, road construction for building temporary platforms or retaining walls for bridge abutments and piers under river levees, and gate construction requiring double closure retaining walls for river levees and pond levees. 2) In cases where bridge piers or waterways are constructed on main roads, retaining walls are often necessary. Ensuring safety for vehicles and pedestrians on the road and preventing impacts on important buried objects beneath the road surface make the application of this method effective. 3) This method is widely applicable in retaining wall construction and temporary bridge construction in proximity work and general levee work. 4) In recent years, soil contamination countermeasures, including those from natural sources, have been implemented. The adoption of this method, which has a shielding wall function to prevent the movement of contaminants from adjacent areas after the removal and purification of contaminants, has been increasing.

Detailed information

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  Soil retention material pull-out simultaneous filling method - Method Overview - Proximity construction - Reliable settlement suppression - Soil contamination measures - Water barrier even after pull-out - Embankment construction - No creation of water pathways

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  Soil retention material extraction simultaneous filling method - Construction method Special filling material is filled into the voids created by extraction from a dedicated filling pipe.

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  Soil retention material pull-out simultaneous filling method - Plant The plant is assembled based on a 4-ton truck, which provides excellent mobility, allows for smooth construction deployment, and makes it possible to work in narrow spaces.

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  Soil retention material extraction simultaneous filling method - Countermeasure costs Risk assessment of business losses and countermeasure costs 1. Standard specification - Reliable settlement suppression type 2,500 yen to 5,000 yen/m* 2. Special specification - Type that suppresses significant settlement 1,500 yen to 2,500 yen/m* (*Varies depending on ground conditions and construction scale)

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  Soil retention material pull-out simultaneous filling method - Proximity construction - Proximity construction - Reliable settlement suppression

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  Soil retention material pull-out simultaneous filling method - levee construction Levee construction - do not create water channels

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  Soil retention material extraction simultaneous filling method - soil contamination countermeasures Soil contamination countermeasures - water barrier even after extraction