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This booklet provides a clear explanation of the process of ground investigation. It includes risks such as vibration risk, tilting risk, repair cost risk, and various ground improvement methods. We are currently offering a free manga booklet. If you are interested, please view the PDF from "PDF Download." [Contents (excerpt)] ■ Vibration risk ■ Tilting risk ■ Repair cost risk ■ Columnar ground improvement work ■ Surface ground improvement work *For more details, please refer to the PDF document or feel free to contact us.

• Earthworks
• Pile and foundation work
• Ground foundation construction method

The "Ground Handbook" is a booklet that introduces methods for ground surveys and ground reinforcement work conducted when constructing new buildings. It provides clear explanations of two commonly used ground survey methods and the ground reinforcement techniques that our company can implement. This can serve as a reference when selecting ground reinforcement methods and can be used as explanatory material for clients. 【Featured Methods】 ■ Surface Improvement Work: Rising W/D Method ■ Friction Piles: Ultra Wood Column Method, Economic Base Method ■ Columnar Improvement Methods: Ultra Column Method, Ultra Pile Method, Ultra Pillar Method *For more details, please refer to the materials. Feel free to contact us with any inquiries.

• Ground foundation construction method
• Ground improvement

The "Ultra Pillar Method" is a ground reinforcement method that uses cement milk pile-like ground reinforcement bodies. Since the original ground and cement milk are not mixed, a more stable quality reinforcement body can be constructed compared to columnar improvement methods, leading to improved construction efficiency. By using a uniquely shaped excavation device, the excavated soil moved from the upper and lower augers is pressed against the hole wall protection mechanism to stabilize the hole wall, resulting in minimal residual soil. 【Features】 ■ No mixing of the original ground and cement milk ■ Stable quality reinforcement bodies can be constructed, improving construction efficiency ■ Uses a uniquely shaped excavation device with inverted auger inclination ■ Minimal soil discharge ■ GBRC performance certification No. 18-20 *For more details, please refer to the PDF materials or feel free to contact us.

• Ground foundation construction method
• Ground improvement

We will introduce the reasons why the "Ultra Wood Column Method" is adopted. Methods such as column improvement and steel pipe pile methods require a supporting layer or stable layer, but this method can be applied at the depth of soft ground. Additionally, it can be implemented up to a maximum of 4.5 meters, specifically addressing soft ground, so there is no need for large, high-power machinery; compact machines like pile drivers can be used. Due to these characteristics, it is adopted in cases such as: "I was told by a ground reinforcement construction company that 'reinforcement work cannot be designed because there is no supporting layer.'" "I was told that the cost of reinforcement work with steel pipe piles is high because the supporting layer is deep." "I was told that I need to implement column improvement for 8 meters in the intermediate layer of the ground." 【Features】 ■ Can be designed for soft ground ■ Construction with small machinery ■ Low raw material costs ■ Reliable because it is a construction method with certified building technology performance *For more details, please refer to the PDF materials or feel free to contact us.

• Special Construction Method
• Ground improvement

The "Rising Method" is a ground improvement technique that involves placing pre-excavated soil into the excavation area and mixing it with slurry using a uniquely developed mixing bucket to create a highly homogeneous block-like improved body. By excavating the soil in advance, it allows for the "confirmation of the supporting layer and the soil to be improved," and also enables the "removal of organic soil that hinders solidification, as well as gravel layers, boulders, industrial waste, and underground obstacles that can impede construction," thus achieving various benefits. ★ It has obtained the Architectural Technology Performance Certification from the Japan Building Disaster Prevention Association. Additionally, it has a record of NETIS registration SK-130021A (registration period has ended). 【Are you facing any of these issues in ground improvement methods?】 ■ Unable to confirm the supporting layer… ■ Unable to manage the quality of the improved body… ■ Unable to remove underground obstacles… ■ Excavation loss due to circular shape construction… ⇒ We will solve all these concerns! * There is also the "Ultra Column Method," which can reduce poor mixing caused by the phenomenon of soil co-rotation that is problematic in low-viscosity ground. * For more details, please refer to the PDF document or feel free to contact us.

• Earthworks
• Ground improvement
• Ground foundation construction method

The "Rising Method" is a ground improvement technique that involves placing pre-excavated soil into the excavation area and mixing it with slurry using a uniquely developed mixing bucket to create a homogeneous block-like improved body. By excavating the soil in advance, it allows for the confirmation of the "support layer and the soil to be improved," and also enables the removal of "organic soil that hinders solidification, as well as gravel layers, boulders, industrial waste, and underground obstacles that may interfere with construction," thus achieving several benefits. *After construction, the mixing condition can be checked with a Rising Tester (resistivity measuring device). It has obtained the Architectural Technical Performance Certification from the Japan Building Disaster Prevention Association. 【Features】 ■ Reliable quality control ■ Enhanced mixing effect with unique technology ■ Applicable to both small buildings and civil engineering structures ■ Compatible with a wide range of soil types ■ Confirmation of advanced ground conditions ■ Low noise and low vibration *There is also the "Ultra Column Method," which can reduce mixing failures caused by the soil's co-rotation phenomenon, which is problematic in low-viscosity ground. *For more details, please refer to the PDF materials or feel free to contact us.

• Earthworks
• Ground improvement
• Ground foundation construction method

The "Rising Method" is a ground improvement technique that involves placing pre-excavated soil into the excavation area and using a uniquely developed mixing bucket to mix the soil with slurry (W method) or soil with solidifying agents (D method), thereby constructing a highly homogeneous block-like improved body. By excavating the soil in advance, it allows for the "confirmation of the supporting layer and the soil to be improved," and also enables the "removal of organic soil that hinders solidification, as well as gravel layers, boulders, industrial waste, and underground obstacles that may impede construction," achieving various benefits. Additionally, in the W method, as a quality control test immediately after construction, the resistivity of the improved body is measured to confirm the mixing conditions. It has obtained the Architectural Technical Performance Certification from the Japan Building Disaster Prevention Association. 【Features】 ■ Reliable quality control ■ Enhanced mixing effect with unique technology ■ Applicable to small buildings as well as civil engineering structures ■ Compatible with a wide range of soil types ■ Confirmation of advanced ground ■ Low noise and low vibration *For more details, please refer to the PDF materials or feel free to contact us.

• Earthworks
• Ground improvement
• Ground foundation construction method

This measurement method has been published in the "2018 Edition Guidelines for the Design and Quality Control of Improved Ground for Buildings." The "Mixing Tester Method (Electrical Resistivity Measurement Test)" is a quality control method for columnar improvement construction using slurry-type mechanical mixing deep mixing treatment. After the columnar improvement construction, a probe for inspection can be immediately inserted, and resistivity values can be recorded every 25 cm, allowing for quality assessment. It has obtained performance certification from the Japan Building Research Institute (GBRC). 【Features】 ■ Immediate confirmation of mixing conditions ■ Clear indication of whether the design pile length has been reached ■ Ability to retain numerical records ■ Measurement device is patented *Available for rental. If you are interested, please feel free to consult with us! For more details, please refer to the materials. Inquiries are also welcome.

• Other measuring instruments
• Piles, caissons, sheet piles
• Ground foundation construction method

Yamashita Kogyo Co., Ltd. offers a total support service from the acceptance of ground surveys to the completion of ground improvement and reinforcement work, including the 20-year building and ground guarantee system "G-Men" and the column improvement construction method "Ultra Column Method NEO." 【Features】 <Ultra Column Method NEO> ■ Acquired construction technology performance certification ■ Achieved a maximum 40% higher concentration of cement milk by using special admixtures to enhance the water-solid ratio ■ High strength and low residual soil ■ Wide range of applications from small to large scale *For more details, please refer to the PDF materials or feel free to contact us.

• Ground foundation construction method
• Ground improvement
• others

Yamashita Industries boasts numerous achievements ranging from single-family homes to large buildings. Starting with ground surveys and the "G-Men" system that guarantees buildings and ground for 20 years, our professionals in ground surveys and improvement work provide total support, including the columnar improvement construction method "Ultra Column Method NEO." 【Features】 <Ultra Column Method NEO> ■ Acquired construction technology performance certification ■ High strength and low residual soil ■ Wide range of applications from small to large scale *For more details, please refer to the PDF materials or feel free to contact us.

• Ground foundation construction method
• Ground improvement
• others

"Rising Liquid" is a high-performance water-reducing agent for cement-based solidifying material slurry, primarily composed of anionic surfactants, which has an excellent water-reducing effect with significant dispersion capabilities and is a non-foaming type. Since it has no hardening or delaying effects, there are no incidents of poor hardening. 【Features】 ■ Has a very high water-reducing ability compared to general water-reducing agents ■ Rising Liquid is a high-performance water-reducing agent of the non-air-entraining type ■ No hardening or delaying effects, preventing incidents of poor hardening ■ Performance: Solidifying agent slurry flow test (in accordance with the standard specifications for construction work JASS15 for plastering work) *For more details, please refer to the PDF materials or feel free to contact us.

• Earthworks
• Ground improvement
• Subsidiary materials

Here are the construction procedures for "Rising W." In the preparation work, to ensure stability during the operation and movement of the construction machinery, we will carry out measures such as laying steel plates, surface ground improvement, curing, alignment and marking, inspection and calibration of measuring devices, and checking the condition of the solidifying agents. 【Construction Procedures】 ■1. Preparation Work ■2. Positioning ■3. Start Excavation ■4. Confirm Excavation Depth ■5. Introduce Improved Soil and Solidifying Agent Slurry ■6. Mixing ■7. Repeat ■8. End of Mixing and Construction *For more details, please refer to the PDF document or feel free to contact us.

• Earthworks
• Ground improvement
• Ground foundation construction method

The "Rising W Method ECO" is based on the proven technology of the "Rising W Method" and utilizes a special admixture (Rising Liquid) to achieve a high concentration of cement milk with a water-to-solid ratio of up to 40%. This allows for the construction of high-strength, low-excavation improvement bodies. By reducing the water-to-cement (W/C) ratio, strength increases while the amount of solidifying agent decreases. Additionally, the reduction in injection volume due to the lower W/C ratio leads to less generated excavation soil, and the improved fluidity of the slurry contributes to eco-friendliness. 【Specifications and Application Range (Partial)】 ■ Improvement Type: Block Type ■ Applicable Structures: Buildings, retaining walls, works, and civil engineering structures ■ Mixing Buckets - Skeleton Mixing Bucket Type A, B (sandy soil) - Rotary Mixing Bucket Type A, B (sandy soil, clayey soil, loam) ■ Solidifying Agents: Cement-based solidifying agents, ordinary Portland cement, blast furnace cement Type B ■ NETIS Registration Number: SK-130021-A *For more details, please refer to the PDF document or feel free to contact us.

• Earthworks
• Ground improvement
• Ground foundation construction method

The "Rising Method ECO" allows for the construction of high-quality improved bodies using the newly developed "Rising Liquid." The stirring conditions are checked with a Rising Tester (resistivity measurement device). The homogeneity of the improved body for the target soil is meticulously verified through mold core testing, enhancing construction quality. Additionally, it can accommodate large-scale improvement works for civil engineering structures and more. This is a reliable method that has obtained the Architectural Technical Performance Certification from the Japan Building Comprehensive Testing Institute. 【Features】 ■ Reliable quality control ■ Enhanced stirring effect with unique technology ■ Applicable to small buildings as well as civil engineering structures ■ Compatible with a wide range of soil types ■ Confirmation of advanced ground ■ Low noise and low vibration *For more details, please refer to the PDF materials or feel free to contact us.

• Earthworks
• Ground improvement
• Ground foundation construction method

We would like to introduce the quality control tests for the "Ultra Column Method NEO." The "resistivity measurement of uncured improved material" is conducted to understand the mixing condition of the improved material immediately after construction by measuring its resistivity. A probe (the tip of the resistivity sensor) is attached to an SS rod and inserted into the center of the column to examine the quality of the target layer using a mixing tester (resistivity measuring device). In addition, this quality control test includes "verification of core recovery rate using boring cores," "slurry specific gravity verification," and "SS drilling." 【Test Contents】 ■ Resistivity measurement of uncured improved material ■ Verification of core recovery rate using boring cores ■ Hexavalent chromium leaching test ■ Uniaxial compression test of core specimens ■ Slurry specific gravity verification ■ Mold core sampling using a sampler ■ SS drilling *For more details, please refer to the PDF document or feel free to contact us.

• Ground foundation construction method
• Ground improvement
• Reinforcement and repair materials

We will introduce the construction procedure for the "Ultra Column Method NEO." The implementation of this method will be carried out under the responsibility of members of the Ultra Column Method Association. 【Construction Procedure】 ■1. Preparation Work ■2. Positioning ■3. Excavation of the Void ■4. Re-mixing of the Tip ■5. Pull-up Mixing ■6. Quality Control Testing 【What is the "Ultra Column Method NEO"?】 It is a column improvement method based on the proven technology of the Ultra Column Method, achieving reduced environmental impact and improved quality. By using a special additive (Ultra Liquid), the water-to-solid ratio of the cement milk can be concentrated up to 40%, allowing for the construction of high-strength, low-residue column improvement bodies. This method has high mixing efficiency, making it suitable for a wide range of soil types, including sandy soil, clay, loam, and volcanic ash. *For more details, please refer to the PDF materials or feel free to contact us.

• Ground foundation construction method
• Ground improvement
• Reinforcement and repair materials

The "Ultra Column Method NEO" is a column improvement method that achieves reduced environmental impact and improved quality, based on the proven technology of the Ultra Column Method. By using a special additive (Ultra Liquid), the water-to-binder ratio of the cement milk can be concentrated up to 40%, allowing for the construction of high-quality column improvement bodies with high strength and low residual soil. This method has a high mixing efficiency, making it suitable for a wide range of soil types, including sandy soil, clay, loam, and volcanic ash. 【Features】 ■ Improved mixing efficiency with unique technology ■ Reliable quality control ■ Various improvement forms available ■ Suitable for small-scale buildings ■ Adaptable to various construction sites ■ Compatible with a wide range of soil types ■ Low noise and low vibration *For more details, please refer to the PDF materials or feel free to contact us.

• Ground foundation construction method
• Ground improvement
• Reinforcement and repair materials

"Ultra Liquid" is a special admixture used in the "Ultra Column Method NEO," a column improvement method that achieves reduced environmental impact and improved quality, based on the proven technology of the Ultra Column Method. By using this product, the water-to-binder ratio of the cement milk can be concentrated up to 40%, allowing for the construction of high-strength, low residual column improvement bodies. 【Features】 ■ Constructs high-quality improvement bodies ■ Usable in the "Ultra Column Method NEO" ■ Can concentrate the water-to-binder ratio of the cement milk up to 40% ■ Capable of constructing high-strength, low residual column improvement bodies *For more details, please refer to the PDF document or feel free to contact us.

• Ground foundation construction method
• Ground improvement
• Reinforcement and repair materials

The "Economic Base Method" uses a uniquely developed casing to excavate soft ground and fills the excavation hole with compacted crushed stone, thereby constructing a columnar crushed stone reinforcement body. This reinforcement body is utilized in combination with the bearing capacity of the original ground as a ground reinforcement method. This method can be adapted to various construction machinery depending on the site, and using a pile driver allows for construction even in narrow spaces or adjacent to narrow roads. Additionally, the crushed stone made from natural stone maintains stable quality and protects the ground over a long period. 【Features】 ■ Crushed stone does not deteriorate ■ Usable in narrow spaces ■ Stable construction with casing ■ Provides safety by supporting with a surface rather than a point ■ Environmentally friendly due to minimal soil displacement *For more details, please refer to the PDF materials or feel free to contact us.

• Ground foundation construction method
• Ground improvement
• Reinforcement and repair materials

The "Ultra Column Method NEO" is a mechanical mixing deep mixing treatment method that uses a cement-based solidifying material slurry. By using a special additive (Ultra Liquid), the water-to-solid ratio of the cement milk can be concentrated up to 40%, allowing for the construction of high-strength, low residual soil columnar improvement bodies. 【Features】 ◆ Quality inspection that usually takes about a week can be completed on the same day ◆ Reduction in the amount of solidifying material ◆ Decrease in generated residual soil ◆ Low noise and low vibration 【For more details, please download the catalog or feel free to contact us】

• Ground improvement materials

Ground Damage Guarantee "G-Men" is Japan's first system that guarantees ground damage due to differential settlement and the damage to buildings associated with ground damage, along with ground surveys and building and ground guarantees. 【Guarantee Details】 ○ Guarantee Period: 10 years from the registration date stated in the guarantee certificate, plus an additional 10 years from the registration date stated in the continuation guarantee certificate → Total of 20 years For more details, please contact us or download the catalog.

• Other civil engineering works
• Earthworks
• Pile and foundation work

The Ultra Pile Method and Gaia Pile Method utilize a unique stop management system that eliminates variability caused by construction machinery and workers, resulting in a significant increase in bearing capacity. This is a high-precision foundation pile technology, certified by the Minister of Land, Infrastructure, Transport and Tourism. 【Features】 ■ Environmental Conservation Rotary penetration method: Achieves pile construction with no residual soil. No industrial waste (such as ground treatment materials or cement milk) is used, and no leftover soil is generated. ■ High Bearing Capacity The unique shape of the pile tip provides a large bearing capacity. Economic pile design is possible. ■ Low Noise and Low Vibration Ideal for pile construction in urban areas, densely populated residential areas, and indoors. ■ High-Performance Construction Machinery Compact yet capable of high torque construction machinery that can adapt to limited construction conditions such as narrow access roads, construction sites, and sites with overhead restrictions (such as factories). *For more details, please contact us or download the catalog.

• Earthworks
• Pile and foundation work
• Ground foundation construction method

The "Rising Method" is a ground improvement technique that involves placing pre-excavated soil into the excavation area and using a uniquely developed mixing bucket to mix the soil with slurry (W method) or soil with solidifying agents (D method), thereby constructing a homogeneous block-like improved body. By excavating the soil in advance, it allows for the "confirmation of the support layer and the soil to be improved," and also enables the "removal of organic soil that hinders solidification, as well as gravel layers, boulders, industrial waste, and underground obstacles that may obstruct construction," achieving several advantages. Additionally, in the W method, as a quality control test immediately after construction, the resistivity of the improved body is measured to confirm the mixing conditions. 【Features】 ■ Reliable quality control ■ Enhanced mixing effects with proprietary technology ■ Applicable to small buildings as well as civil engineering structures ■ Compatible with a wide range of soil types ■ Confirmation of advanced ground conditions ■ Low noise and low vibration *For more details, please refer to the PDF document or feel free to contact us.

• Earthworks
• Ground improvement
• Ground foundation construction method

The "Ultra Wood Column Method" is a mechanical mixing deep mixing treatment method that constructs columnar ground improvement bodies by excavating and mixing the ground while discharging a slurry of cement-based solidifying material. It was developed to eliminate the shortcomings of both conventional columnar improvement methods and wooden pile methods, while enhancing their advantages. This method combines the benefits of columnar improvement methods, which can provide expected frictional force, and the advantages of wooden piles, which offer stable quality due to being prefabricated. Therefore, even with a small diameter and short improvement length, it is possible to achieve significant bearing capacity. Additionally, this has been proven by numerous experimental results. 【Features】 - Constructs reliable ground for small-scale buildings - Achieves large bearing capacity even with a smaller diameter than conventional columnar improvement bodies - Ensures quality control and construction management - Can be adapted to narrow sites - High mixing efficiency allows for construction in a short period For more details, please contact us or download the catalog.

• Earthworks
• Piles, caissons, sheet piles
• Pile and foundation work

The mixing tester method is a quality inspection for columnar improvement using slurry of cement-based solidifying materials. This method involves inserting a probe into the unsolidified columnar improvement and measuring the electrical resistivity along its entire length, thereby quantifying and clarifying its homogeneity. 【Features】 ○ Quality control can be performed immediately after construction ○ The quality of the columnar improvement can be quantified and recorded ○ It becomes clear whether the design pile length has been reached For more details, please contact us or download the catalog.

• Earthworks
• Piles, caissons, sheet piles
• Pile and foundation work

Yamashita Industry responds with reliable technology in ground improvement work, steel pipe pile work, and ground surveys. 【Here’s what we can do!】 ◎ Ground Improvement Work Ultra Column Method (Building Technology Performance Certification Obtained) Columnar Improvement Pile Work (Dry Method) Columnar Improvement Pile Work (Soil Column) Surface Improvement Work (Dry Method & Soil) ◎ Steel Pipe Pile Work Designated Construction Company for Ultra Pile (Ministry of Land, Infrastructure, Transport and Tourism Certification) Member of Gaia Pile Association (Ministry of Land, Infrastructure, Transport and Tourism Certification) ◎ Ground Surveys Swedish Sounding Test Dynamic Cone Penetrometer Test Simple Penetration Test Boring Survey ◎ Others Pile Driving Work, Earth Retention Work, Plate Load Test Building Settlement Correction Work MS Foundation Work ↓↓ For more details, please contact us or download the catalog ↓↓

• others

The Ultra Column Method is a mechanical mixing deep mixing treatment method that uses cement-based solidifying material slurry. It employs a unique cross-shaped anti-rotation wing on the excavation head, which reduces mixing failures caused by the soil rotation phenomenon that can occur in viscous ground. Additionally, by measuring the specific resistance of the column with a mixing tester immediately after construction, the mixing conditions can be confirmed, allowing for the creation of high-quality columns. 【Features】 ○ Improved mixing efficiency with unique technology ○ Reliable quality control ○ Various improvement forms available ○ Suitable for small-scale buildings ○ Adaptable to a wide range of soil types ○ Column diameter φ500 to φ1300mm ↓ For more details, please contact us or download the catalog ↓

• Ground improvement
• others