エスティーエンジニアリング List of Products and Services

"PLUX-EX" is a revolutionary protective tube for external cables that dramatically improves grout filling properties by forming unique uneven grooves on the inner surface of polyethylene pipes with an optimal pitch, thereby enhancing the durability and fatigue characteristics of the cables. It features "inner convex spiral tubes" in the free length section and "inner concave spiral tubes" in the deflection and saddle sections. 【Features】 - Ensures thorough grout filling in both the free length and deflection sections - Effectively fills strong alkaline grout to suppress air pockets - Significantly improves the life cycle cost of external cables For more details, please contact us or download the catalog.

• Foundation construction
• others
• grout

"PLUX-1" is a polyethylene sheath for internal cables that is gentle on PC steel materials. High-density polyethylene can be safely used in structures exposed to extremely low-temperature environments and also exhibits excellent chemical resistance, making it an economical and weather-resistant material. 【Features】 - No localized tearing due to wiring misalignment in the R section - Good distribution of deflection pressure, excellent fatigue resistance - High bending rigidity, resulting in low and stable λ - Main reinforcement binding possible with ribbed bottom (cable diameter = body diameter) For more details, please contact us or download the catalog.

• Steel
• others

High-expansion polyurethane injection material [NTR Foam] is a product developed for filling cavities behind tunnel walls. Due to its high expansion, it can fill cavities with a small amount, making it very economical. Moreover, it has an extremely low specific gravity, which does not impose a significant load on the tunnel. Additionally, its curing time is very short, making it suitable for projects that require quick construction. 【Features】 ○ Because it is a high-expansion polyurethane, the required material can be reduced by the expansion ratio, making construction simple and lightweight. ○ The short curing time allows for limited injection, and even in the presence of water inflow, the possibility of material separation and outflow is minimal, thus not adversely affecting the water environment. ○ The foamed solid forms a water-insoluble polymer compound with a three-dimensional structure, which is chemically stable and maintains its shape and strength over the long term. ○ Compliant with the "Guidelines for Safety Management of Polyurethane Injection Materials in Mountain Tunnel Construction." ○ A lightweight, compact injection machine that offers good workability and can be used in long and narrow environments. For more details, please contact us or download the catalog.

• Safety and consumables

In recent years, tunnel construction sites have been required to respond to strict conditions, such as construction in urban areas and low cover depths. Under such conditions, the "injection-type pre-support method" has been widely adopted as a safe, reliable, and cost-effective auxiliary construction method. Among the injection materials used in the injection-type pre-support method, silica resin-based injection materials are utilized as they meet many of the demands required on-site, including strength, permeability, safety, and even economic efficiency. 【Features】 ○ Compatible with various geological conditions and construction methods ○ Can efficiently improve the ground For more details, please contact us or download the catalog.

• Safety and consumables
• Bridge Construction

The "AGF-STD method" involves the installation of long steel pipes with a diameter of φ114.3mm in an umbrella shape at the tunnel excavation surface. It adopts a steel casing for the terminal pipes (removal pipes) in non-widening and minimal widening construction, which is easy to handle as industrial waste, making it an economical and environmentally friendly injection-type long steel pipe method. The steel casing of the terminal pipes is made from 0.5mm thick strip steel that is continuously spiral riveted. Due to its thin-walled nature, injection holes can be arranged in a staggered pattern with a diameter of φ10mm, and slit processing in the perpendicular direction of the casing pipe, as well as axial long hole processing, can be easily performed. After excavation, the removal pipes can be relatively easily dismantled as needed, allowing for the separation of iron and internal waste materials. 【Features】 - Improved screw strength - Realization of lightweight design For more details, please contact us or download the catalog.

• Special Construction Method

The FIX tube (S type) is an improved version of the conventional FIX tube, applying a long-length pre-ground reinforcement method using "dimpled steel pipes" with recessed surfaces for long-length mirror bolts. By combining it with a unique "no widening construction" that uses a steel sheath for the long-length fore-piling terminal pipe at the top, it balances the placement in all directions to suppress the loosening area, achieving effective full-section excavation and early closure economically. 【Features】 ○ Long-length fore-piling utilizes no widening construction with steel pipes and steel sheaths. ○ Waste separation is possible through the selection of slit patterns in the steel sheath. ○ Long-length mirror bolts achieve high adhesion strength with thin-walled dimpled steel pipes. ○ High tensile strength is achieved by inserting indented steel pipes into the dimpled steel pipes. ○ Unique bulkhead construction allows for pressure injection without leaks. For more details, please contact us or download the catalog.

• Earth retaining wall/foundation reinforcement
• Earthworks
• Pile and foundation work

The "SP Face Method" is a high-speed, economical medium-length face bolt method that allows for easy work with "3 meters of excavation" at a time. When combined with the high-speed fore-poling "SP-IF Method," it is effective in a 3-meter cycle. 【Overview】 - Install a 6-meter hollow FRP bolt in front of the face without connections and excavate in 3-meter increments. - It is effective in a 3-meter cycle when combined with the high-speed fore-poling "SP-IF Method." For more details, please contact us or download the catalog.

• Earthworks
• Pile and foundation work
• Special Construction Method

The "SP-IF method" is an economical high-speed fore-poling that allows for easy work with "advancement of 3 meters at a time." A 2.5m hollow FRP bolt is connected to the rear end of a 4m self-drilling bolt, allowing for a total fore-poling length of 6.5m. It achieves a minimum of two layers of top-end bolt reinforcement at all excavation locations. 【Overview】 ○ Implemented for every three steel supports (advancing 3m at a time) ○ Narrow excavation while cutting away the subsequent FRP pipe ○ Striking the drive coupler to avoid damage to the FRP bolt ○ SP-IF excavation length: 3.0m For more details, please contact us or download the catalog.

• Earth retaining support
• Earthworks
• Pile and foundation work

Self-drilling bottles are more widely used for their simplicity and speed of operation in reinforcement earthworks such as mountain tunnel auxiliary works and slope stabilization, as well as for their overall economic efficiency and workability in confined spaces. The "SP Mini Pile" is a thick-walled self-drilling system developed by "ST Engineering Co., Ltd." aimed at further expanding the application of the advantages of the self-drilling system into a broader range of fields. 【Components】 ○ SP Fixed Nut ○ SP Coupler ○ SP Bolt ○ SP Bit For more details, please contact us or download the catalog.

• Ground foundation construction method

The "SP Fix Pile" uses a hollow SP bolt as a center rod and employs a double-tube drilling method with a general-purpose drill pipe, which can also be applied as a micro-pile. Once drilling is completed, injection is performed through the SP bolt, and only the drill pipe is withdrawn, eliminating the need for rod retrieval or core material installation, thus enabling labor-saving and high-speed construction. Although it features a thick bolt structure with a diameter of 115mm or more, stable drilling and reliable shaping through pressurized injection can be achieved with a general-purpose anchor machine up to about 20m, making it effective as a long, thick bolt for countermeasures on slopes with extremely deep soft layers or embankment slopes. Additionally, when adopted as a compression-type pile foundation, placing a "mouth reinforcement pipe" at the head allows for the rational handling of horizontal forces and bending moments in addition to axial compressive forces. 【Features】 - It is a reinforcement soil method that does not introduce tension, eliminating the need for tension management. - Even if over-tension occurs due to seismic loads, there is no issue with tension adjustment. - The SP bolt is used as a center rod for double-tube drilling, leaving it in place, so core material insertion work is unnecessary. - It is a waiting-type reinforcement soil that does not require tensioning work. - The work process can be shortened, achieving high-speed construction. For more details, please contact us or download the catalog.

• Renovation and repair methods

"SP Micro Pile" is a unique micro pile construction method developed based on publicly available research from various countries, including Italy, the United States, and Japan, with a thorough pursuit of improved workability, long-term quality maintenance, and cost-effectiveness. 【Features】 ○ High strength orientation ○ Ministry of Land, Infrastructure, Transport and Tourism NETIS registration number: KK-100036-A For more details, please contact us or download the catalog.

• Earth retaining wall/foundation reinforcement
• Earthworks
• Pile and foundation work

The "ST Micro Cap" has an angle adjustment function for ground inclination, enabling simplification of structure and pursuit of cost-effectiveness through the integration of conventional washers and spacers, as well as allowing for secondary injection options to the prone-to-issues back side of the fixation. 【Features】 ○ Secondary injection possible on the back side ○ Foam injection with no voids on the back side ○ Solution for grease leakage For more details, please contact us or download the catalog.

• Earthworks
• Pile and foundation work
• grout

The "SP Fix Pile" uses a hollow SP bolt as a center rod and employs the "Permanent Route Pile Method," which involves double-tube drilling with a general-purpose drill pipe, and can also be applied as a micro pile. Once drilling is complete, injection is performed through the SP bolt, and only the drill pipe is withdrawn, allowing for labor-saving and high-speed construction without the need for rod recovery or core material installation work. Although it features a thick bolt structure with a diameter of 115 mm or more, stable drilling and reliable shaping through pressurized injection can be achieved with a general-purpose anchor machine up to about 20 meters, making it effective as a long, thick bolt for countermeasures on slopes with extremely deep soft layers or embankment slopes. Additionally, when adopted as a compression-type pile foundation, placing a "mouth reinforcement pipe" at the head allows for the rational handling of horizontal forces and bending moments in addition to axial compressive forces. 【Features】 - Permanent Route Pile Method - Labor-saving and high-speed construction without rod recovery or core material installation work - Reliable shaping through stable drilling and pressurized injection - Rational handling of horizontal forces and bending moments in addition to axial compressive forces For more details, please contact us or download the catalog.

• Renovation and repair methods

Rock bolts are widely used in tunnel support work and slope reinforcement work in mountainous areas. Among these, particularly in cases where the ground does not support the hole walls or on steep slopes, self-drilling rock bolts that can be used directly as rock bolts with drilling rods have become popular to improve workability. Esty Engineering Co., Ltd. has recently completed the development of the self-drilling rock bolt "SP Anchor," which pursues improved workability and thorough cost-effectiveness. We sincerely hope for your wide utilization of this product. 【Components】 ○ SP Bit ○ SP Bolt (Hollow rolled screw steel bar) ○ SP Coupler ○ SP Nut For more details, please contact us or download the catalog.

• Earth retaining wall/foundation reinforcement
• Earthworks

The "SP Soil Nail - SR Type" is based on the conventional "SP Soil Nail" but further improves the tensile strength of the core material. It features a unique design where PC steel wire, which has been processed with indentations to enhance adhesion, is inserted after the main wire, making it an economically superior Strand Reinforce (SR) type of simple double-tube high-strength rock bolt method that can also be proposed for partial areas of permanent anchors. 【Features】 ○ Significantly increased strength providing anchor-like restraining force ○ Insertion of PC steel wire after bolt installation For more details, please contact us or download the catalog.

• Earth retaining wall/foundation reinforcement
• Earthworks
• Pile and foundation work

"SP Soil Nail" achieves "high speed," "simplicity," and "low cost" compared to the conventional double-tube drilling method. Compared to the traditional double-tube method using anchor machines, the components are lightweight, eliminating the need for rod retrieval and core material installation, enabling labor-saving and high-speed construction. The pressurized injection effect of SP Soil Nail has been verified through tests such as "excavation tests." 【Features】 ○ High-speed, labor-saving construction ○ Reliable anchoring achieved through pressurized injection For more details, please contact us or download the catalog.

• Earth retaining wall/foundation reinforcement
• Earthworks
• Pile and foundation work

In areas where access is difficult and the boreholes cannot stand independently, the leg drill method using rope scaffolding has been widely used. In contrast, the "SP Leg Drill" actively employs "two-directional pressure injection," enabling the installation of permanent bolts up to 3.0 meters even in ground where the boreholes cannot stand independently. Additionally, this pressure injection can be applied for the repair of aging slope protection structures. 【Features】 - Economical short-length rock bolts for ground where boreholes cannot stand independently - Reliable anchoring achieved through pressure injection For more details, please contact us or download the catalog.

• Earth retaining wall/foundation reinforcement
• Earthworks

The "ST Lock Bolt" is a reinforcement material (lock bolt) that is compatible with permanent slopes treated for corrosion on screw-threaded steel bars. By inserting the "ST Lock Bolt" into the ground, it enhances the stability of the entire slope through interaction with the ground. 【Mechanical Properties】 ○ Steel grade: SD345 ○ Yield point or 0.2% proof strength: 345–440 N/mm² ○ Tensile strength: 490–660 N/mm² For more details, please contact us or download the catalog.

• Reinforcement and repair materials

This is a full-scale high-strength micro-pile construction method that involves double-tube drilling with large-diameter self-drilling bolts and thick-walled steel pipes, ensuring reliable bolt adhesion by extracting the thick-walled steel pipe within the support layer, and placing the thick-walled steel pipe in the upper section. 【Features】 ● Double-tube drilling with self-drilling bolts Great support capacity even with a narrow diameter. (Can accommodate compression, pull-out, and lateral loads) ● Double-tube drilling using self-drilling bolts and thick-walled steel pipes. (Can be handled with conventional anchor machines) ● Construction is possible even in narrow workspaces by selecting the appropriate installation machinery. ● Injection work can be carried out immediately after drilling is completed. (High-speed construction is economical) ● Reduces the time until steel pipe extraction. (Adhesion with the ground occurs, making extraction reliable) ● Easy connection of bolts and steel pipes. ● For other functions and details, please contact us.

• Steel structure construction
• Foundation construction

This is a reinforcement material (rock bolt) designed for permanent slopes treated with corrosion protection for screw-type steel bars. By inserting the ST rock bolt into the ground, it enhances the stability of the entire slope through interaction with the ground. 【Features】 - Reinforcement material suitable for permanent slopes due to heavy corrosion protection treatment - Applicable for soil pressure-resistant slope protection works and small to medium-scale collapse countermeasures - Suitable for countermeasures against collapse during temporary steep excavation or steep cut slopes. ● For other functions and details, please contact us.

• Reinforcement and repair materials
• Bridge Construction