ゲルブ・ジャパン List of Products and Services

The "Floating Floor Method" is an advanced technology designed to control vibration and airborne noise (solid sound) transmitted through structures within buildings. Our vibration isolation system demonstrates exceptional performance due to its low natural frequency, outperforming other elastic pads and similar products. It can lower the natural frequency from 2.5Hz to 7Hz, making it an effective solution to protect areas that are highly sensitive to vibrations from mechanical vibrations and solid sound. 【Standard Vibration Isolation System by Gelb】 ■ Conventional spring units placed under the supported object ■ Jack-up type embedded coil spring units *For more details, please download the PDF or feel free to contact us.

• Earthquake-resistant construction method

When applying the mat slab method for vibration control, please compare it with Gelb's floating floor method. We will provide you with a proposal that offers cost benefits.

• Other commercial buildings and service facilities

This document explains the vibration isolation of vibration testing machines. We will discuss the floating foundation we propose for the vibration testing machine, the advantages of metal springs, and the vertical locking mechanism. For equipment that intentionally generates vibrations, such as vibration machines and earthquake simulators, it is important to implement vibration isolation measures to prevent testing losses. 【Contents】 ■ We propose a floating foundation for the vibration isolation of vibration testing machines. ■ The advantages of metal springs for vibration isolation of vibration testing machines are recognized. ■ Range of proposals from Gelb. ■ Vibration isolation is achieved from frequencies above the value obtained by multiplying the natural frequency of the isolation components by the square root of 2. ■ The vertical locking mechanism allows for the secure seating of the floating foundation. *For more details, please download the PDF or feel free to contact us.

• Vibration and Sound Level Meter

The "GERB Vibration Isolation" is a vibration isolation system that uses an isolation base to provide stability against locking motions during clutch/brake operations. This device employs very high damping force to quickly stabilize the amplitude of the press, achieving comfortable and efficient operability. Additionally, there are numerous delivery records within the country. 【Features】 ■ Responds to locking motions (back-and-forth swaying) ■ Vibration isolation system using an isolation base ■ Utilizes very high damping force ■ Quickly stabilizes the amplitude of the press *For more details, please download the PDF or feel free to contact us.

• others

We would like to introduce the vibration isolation support for recycling machinery. Our coil springs are designed and manufactured according to DIN standards, providing horizontal elastic properties and the ability to accept horizontal loads. This system protects the equipment during an earthquake. Additionally, the coil springs and dampers are integrated, allowing for easy installation simply by placing them under the machine body, and they are also easy to replace. 【Benefits of applying Gelb (partial)】 ■ The coil spring system reduces dynamic load transmission from the machine body to the supporting structure to below 10 percent, maintaining an almost vibration-free state. ■ Viscodampers, which provide damping force proportional to speed, work in conjunction with the coil spring system to absorb vibration energy and suppress large amplitudes generated during machine startup and shutdown due to resonance. *For more details, please download the PDF or feel free to contact us.

• Earthquake-proof and vibration-damping equipment

Buildings adjacent to railways, such as hotels and music facilities, are integrated with railway facilities, so it is necessary to reduce the impact of vibrations and solid-borne noise generated during train operations. Coil springs exhibit higher vibration isolation effectiveness than anti-vibration rubber. By using floating track slabs, it is possible to reduce vibrations transmitted from the track to the building by one-tenth (-20dB to -30dB). We propose construction methods tailored to the type of track and site conditions. **Advantages of the Gelb Method:** - Reduction in the number of installations due to high load-bearing coil springs - No need for stoppers due to horizontal rigidity - High corrosion resistance allows for outdoor application - Embedded slab design reduces installation height - Easy height adjustment with shims *For more details, please download the PDF or feel free to contact us.*

• Earthquake-resistant construction method

We would like to introduce our viscous dampers, "Viscodampers." These dampers have a structure where a piston is immersed in a container filled with a viscous material. By adding damping force, the viscous damper suppresses oscillation, reducing amplitude even when vibrations occur at the resonance frequency, allowing for safe vibration control. We also offer a mat/pad called "NOVODAMP," made from a special polyurethane material. 【Features of the Viscous Damper】 ■ High damping force ■ Damping in three dimensions (x, y, z) ■ No maintenance required *For more details, please download the PDF or feel free to contact us.

• Earthquake-proof and vibration-damping equipment

We would like to introduce a case where the floating floor method was applied in a precision machinery manufacturing factory. In this factory, traffic vibrations from a nearby main road were occurring, leading to challenges in ensuring manufacturing quality and the need for advanced vibration isolation effects. Therefore, we conducted on-site vibration measurements and considered countermeasures based on the results. We optimized the design and layout according to the specific conditions of the site. [Challenges] ■ The vibration isolation using conventional rubber materials was insufficient. ■ It was not possible to verify or predict the vibration isolation effects in advance. *For more details, please download the PDF or feel free to contact us.

• Earthquake-resistant construction method

We would like to introduce examples of the application of floating floor methods in measures against solid sound propagation. Buildings adjacent to railways, such as hotels and music facilities, require measures to reduce the impact of vibrations and solid-borne sound generated during train operations, as the railway facilities are integrated structures. At the Shanghai Symphony Hall, vibration and noise from nearby subway tracks were addressed through building support using coil springs, while a research facility implemented noise control with a floating floor structure using coil springs. 【Case Summary (Excerpt)】 <Shanghai Symphony Hall> ■ Purpose: Concert hall (vineyard style, 1,200 people) ■ Objective: Measures against vibration and noise from nearby subway tracks ■ Specifications ・Building weight: 37,500t ・Vibration isolation natural frequency: 3.6Hz *For more details, please download the PDF or feel free to contact us.

• Earthquake-resistant construction method

We would like to introduce a case study that applied a floating floor method at a fitness (dance studio). In this facility, there were concerns about vibration transmission to the hotel within the same building. Additionally, due to height restrictions for the new building, it was necessary to reduce the floor height to secure the number of guest room floors in the hotel. Therefore, we implemented height reduction by embedding coil springs into the floating floor and conducted on-site vibration measurements to confirm the vibration isolation effectiveness after construction. [Challenges] ■ High-level vibration isolation performance is required as a countermeasure for fitness vibrations. ■ Conventional vibration isolation using rubber materials would require increasing the floor height, necessitating the reduction of one floor in the hotel. *For more details, please download the PDF or feel free to contact us.

• Earthquake-resistant construction method

We would like to introduce a case where a floating floor method was applied in the audience hall of a concert arena. In this facility, there are nearby apartments, schools, and hospitals, and if issues become apparent after completion, it could hinder operations. There were challenges in verifying and predicting vibration isolation effects in advance. Therefore, we designed and considered the project according to the site conditions, quantitatively predicting the vibration isolation effects through desktop studies. We also provided on-site support during construction. [Challenges] - A music hall within a complex facility, adjacent to hotels and commercial establishments - Few vibration isolation measures targeting low frequencies (2-3 Hz) - Insufficient effectiveness of vibration isolation using rubber materials *For more details, please download the PDF or feel free to contact us.

• Earthquake-resistant construction method

This document introduces examples of the application of "TMD" conducted by our company. It includes detailed cases such as a 370m long bridge, floor vibrations in stores, a 267.7m tall skyscraper, and a 45m tall hotel. We present these examples along with images and diagrams, making it a useful reference when considering implementation. We encourage you to read it and make use of it. 【Featured Cases】 ■ Bridges ■ Floor Vibrations ■ Skyscrapers ■ High-rise Buildings *For more details, please download the PDF or feel free to contact us.

• Earthquake-resistant construction method

Our company conducts installation and adjustment work for viscous dampers and spring elements, as well as installation supervision work and measurement and analysis of vibrations and solid sounds generated by machinery and equipment. We provide economical vibration isolation foundations that meet customer requirements for various types of equipment. The technology for reducing vibrations has been researched and refined at Gelb for many years to ensure the safety and reliability of machinery, making it a modern and sophisticated solution. If you are troubled by even very small vibrations or noise in your surroundings, Gelb is here to support you. 【Areas of Activity (Partial)】 ■ Installation and adjustment work for viscous dampers and spring elements, as well as installation supervision work ■ Measurement and analysis of vibrations and solid sounds generated by machinery and equipment ■ Engineering from the provision of fabrication drawings for both reinforced structures and reinforced concrete structures to construction supervision ■ Foundation design for machinery and equipment or building structures, considering economic efficiency based on customer specifications *For more details, please download the PDF or feel free to contact us.

• Earthquake-resistant construction method

This document provides a detailed explanation of "railway track vibration control." It includes solutions such as "Gelb's solutions for controlling solid-borne sound and vibrations," "solutions using metal coil spring devices," and "solutions using NOVODAMP closed-cell polyurethane." Additionally, it presents examples of achievements along with images, making it an easy-to-reference publication. We encourage you to read it. 【Contents (partial)】 ■ Vibration control and track stiffness adjustment sections using floating slab track systems ■ Gelb's solutions for controlling solid-borne sound and vibrations ■ Solutions using metal coil spring devices ■ Solutions using NOVODAMP closed-cell polyurethane *For more details, please download the PDF or feel free to contact us.

• Earthquake-resistant construction method

Our company proposes the "floating floor method" as a vibration isolation measure for vibration testing machines. By suppressing losses during vibration testing due to low natural frequencies, it contributes to obtaining accurate test results. Its space-saving design also allows for flexible adaptation to installation site constraints. Additionally, it can reduce natural frequencies from 2.5Hz to 7Hz, protecting work areas that are very sensitive to vibrations, such as those handling precision instruments, from mechanical vibrations and solid-borne sound. 【Features】 ■ High vibration isolation performance contributes to improved accuracy in vibration testing ■ Capable of reducing natural frequencies from 2.5Hz to 7Hz ■ Space-saving design makes it easy to install even in limited spaces *For more details, please refer to the materials. Feel free to contact us with any inquiries.

• Earthquake-resistant construction method

This document introduces the elastic support of power plant structures and equipment. It includes detailed information on "vibration control" and "earthquake measures." Additionally, it discusses "adjustments during ground subsidence" using a gel elastic support system. The content is presented clearly with images and diagrams, making it a useful reference when considering implementation. We encourage you to read it and make use of it. 【Contents (partial)】 ■ Vibration measures for power plant structures and equipment ■ Vibration control ■ Earthquake measures ■ Adjustments during ground subsidence *For more details, please download the PDF or feel free to contact us.

• Earthquake-resistant construction method

This document introduces examples of vibration isolation buildings adopted overseas, aimed at assisting measures against railway vibrations. It includes cases such as the vibration isolation building adopted in the Shanghai Symphony Hall, completed in 2014 in Shanghai, China, as well as examples of subway vibration countermeasures for a newly constructed office building and a classroom-laboratory building at Peking University, and vibration countermeasures for track vibration using NOVODAMP(R). We encourage you to read it. 【Contents】 ■ Introduction ■ Railway Vibration Characteristics and Applicable Standards ■ Examples of Railway Vibration Countermeasures ■ Conclusion *For more details, please refer to the PDF document or feel free to contact us.

• Vibration isolation, vibration control, and earthquake resistance construction

This document introduces a case (conducted in 2017) where complaints from neighboring residents arose due to vibration propagation caused by a 1000T press equipped with other types of vibration isolation devices at the time of its new installation. The case was implemented with the aim of improving vibration isolation performance. It includes tables summarizing the specifications of the target press, proposed vibration isolation specifications, and measurement results at the site boundary, as well as figures summarizing press amplitude calculation results and vibration level measurement results. We invite you to read it. [Contents] ■ Introduction ■ Vibration isolation proposals for the target press ■ Installation of vibration isolation devices ■ Confirmation results of vibration isolation performance ■ Summary *For more details, please refer to the PDF document or feel free to contact us.

• Vibration isolation, vibration control, and earthquake resistance construction

This document introduces vibration control measures for buildings and mechanical equipment using TMD (Tuned Mass Damper). Since supplying TMD for vertical vibration control of cable-stayed bridges in 1987, Gelb has a wealth of experience in providing solutions for horizontal vibrations in skyscrapers, control towers, observation towers, and vertical vibrations in bridge girders and large-span floors. Vertical vibration control is applied to structures such as long-span beams, staircases, and stadium roofs. The TMD, which operates in the vertical direction, consists of a coil spring and a viscous damper, and has been adopted for pedestrian vibration control exemplified by the London Millennium Bridge and for traffic vibration control on the Hong Kong-Zhuhai-Macao Bridge. Additionally, an AMD (Active Mass Damper) was installed beneath a concert hall in a hotel in Las Vegas as a measure against vertical vibrations, and local measurements confirmed its effectiveness in reducing vibrations. [Contents] ■ Introduction ■ TMD for High-Rise Buildings ■ TMD for Earthquakes ■ Vertical Vibration Control *For more details, please refer to the PDF document or feel free to contact us.

• Foundation construction

Our company's "Floating Floor and Floating Room Method" is a noise and vibration control method for partial floor areas or specific rooms within a building. It involves "vibration isolation," which controls the transmission of noise and vibrations generated on the floor or in the room to the outside, and "vibration damping," which controls the transmission of external noise and vibrations to the floor or within the room. The former, vibration isolation, is applicable to fitness studios, dance halls, live houses, and helipads, while the latter, vibration damping, is suitable for semiconductor manufacturing equipment, television studios, recording studios, and concert halls. 【Features】 ■ High vibration isolation effect with a natural frequency of 3-5 Hz ■ Provides a floating floor system that can reduce the height of the floor ■ Composed of a floating slab embedded with springs ■ Shim insertion into the unit is also possible ■ Structure allows for level adjustment of the floor finish *For more details, please refer to the PDF document or feel free to contact us.

• Special Construction Method

This is an introduction to the Gelb vibration isolation system, which is equipped with seismic isolation features from the perspective of earthquake measures for press machines. Our company has been supplying metal coil springs and damper devices that withstand earthquakes for various large machines for several decades. For example, properly designed elastic support systems have protected turbine generators in thermal and nuclear power plants in many countries from earthquakes. These ideas have gradually evolved, and today, more efficient earthquake countermeasure systems are applied to many machines, equipment, and buildings. **Features of the Gelb Vibration Isolation System** - Composed of metal coil springs and viscous dampers - Flexibly supported using metal coil springs - Reduces ground vibrations generated during the operation of press machines - The resistance generated by the viscous damper suppresses the persistence of machine vibrations - Effective in three-dimensional directions and can operate in the horizontal direction as well - No friction sliding parts, ensuring no aging deterioration and maintenance-free *For more details, please refer to the PDF document or feel free to contact us.*

• others

This is an introduction to our company's "vibration control measures for servo presses." The reason why excessive press vibration is a problem is that the continued vibration before the next operation leads to a decrease in precision. Our vibration control device features a structure where the coil spring and the viscous damper VISCODAMPER are independent of each other. As a result, by adjusting the coil spring to lower the natural frequency of the vibration control system, we enhance the vibration control effect, while increasing the damping force of the viscous damper allows for rapid convergence of the vibration. [Features] - Independent structure of the coil spring and viscous damper VISCODAMPER - Enhanced vibration control effect by lowering the natural frequency of the vibration control system - Increased damping force of the viscous damper - Enables rapid convergence of vibration *For more details, please refer to the PDF document or feel free to contact us.

• others

We would like to introduce our "Vibration Control Measures for Power Plant Equipment." The equipment used in power plants, such as turbines, feed pumps, and coal mills, generates unwanted vibrations and typically requires a heavy foundation system. By introducing our elastic support, the foundation can be significantly reduced, allowing for savings in both construction time and costs. The spring-based support system for turbines has been developed by our company in collaboration with multiple turbine manufacturers. This system was first adopted in 1968 for supporting a 600MW turbine in a nuclear power plant and has since been used for turbines up to 1600MW, being utilized worldwide. 【Features】 ■ Prevention of damage to turbine equipment due to earthquakes ■ Reduction of foundation construction costs and time ■ Expansion of available space for condensers and piping under the turbine ■ Ability to separate the turbine foundation from the substructure made of columns and beams, blocking vibration transmission ■ Possibility to integrate the above substructure with the turbine building ■ Easy adjustment of the turbine deck height in case of uneven foundation settlement *For more details, please refer to the PDF document or feel free to contact us.

• others

In recent years, the precision required for measuring instruments and processing machines has become increasingly strict, and there are not a few cases where vibrations generated from inside and outside buildings have a fatal impact on measurement and processing. To block the vibrations from vehicles and trains running on roads, as well as the vibrations from equipment used on different floors within the same building, there is a "floating floor vibration isolation system" designed to also block vibrations from gymnasiums and dance floors. By supporting the floor with springs, it isolates vibrations from the ground or to the ground. Most floating floor vibration isolation systems in Japan use rubber. However, rubber deteriorates over time, which can lead to a failure to achieve the intended effects. Deteriorated rubber needs to be replaced, resulting in maintenance costs and replacement work. Gelb's vibration isolation devices use durable coil springs, allowing them to maintain high vibration isolation performance over the long term. This helps reduce maintenance costs and labor.

• Anti-vibration rubber

Buildings/devices shaking can be troublesome. If you want to implement vibration control but don't know how... this is for you! Gelb Japan, with proven results in Europe and Japan, will propose the optimal device. What is TMD? It stands for Tuned Mass Damper. This device installs a weight (mass) to suppress vibrations of the target object. It is effective in both vertical and horizontal directions. As a passive type damper, it does not require power or other energy for operation, ensuring stable performance. It is effective for structures like cantilever balconies, where it is difficult to increase rigidity. Gelb's TMD has been used in the Millennium Bridge in London, UK, and has numerous achievements worldwide. (Target examples: bridges, stairs, stadium roofs, chimneys, masts, etc.)

• Balcony/Sunroom Unit

We would like to introduce our company's "Vibration Mitigation Measures for Railway Tracks." The importance of railways with excellent eco-performance as a solution to 21st-century transportation issues is increasing. However, various types of railways, including linear railways, cannot ignore the vibrations transmitted to the surrounding environment. Our "Gelb Floating Slab Track System" significantly reduces vibrations propagated to the surroundings during train operation and effectively functions as a solid sound mitigation measure. [Features] - The natural frequency of the vibration mitigation device can be designed to approximately 4 to 8 Hz. - The vibration mitigation device can be embedded within the slab. - Installation and replacement of the spring unit can be performed from above the track slab. - High horizontal rigidity allows for minimal lateral deformation during train operation and small to medium earthquakes. - Durable coil springs and viscous dampers are maintenance-free. *For more details, please refer to the PDF materials or feel free to contact us.

• Anti-vibration rubber

We will introduce "Earthquake Countermeasures for Buildings and Machinery." Our company has a long track record in earthquake countermeasures for heavy machinery. Vibration control devices for turbines and generators at nuclear and thermal power plants have been in use for over 40 years and are still operational worldwide. The scope of our earthquake countermeasures extends widely, covering nuclear and thermal power plants, petrochemical and gas plants, high-voltage transformer equipment, and vibration-sensitive research equipment. 【Earthquake Countermeasure Systems】 ■ Base Control System (BCS) ■ Tuned Mass Damper (TMD) *For more details, please refer to the PDF materials or feel free to contact us.

• Anti-vibration rubber

We would like to introduce our "Viscous Damper for Piping." This product is used to prevent vibrations and damage in the piping of power plants and industrial plants. It is derived from viscous dampers that have been used in mechanical foundation systems alongside coil springs for over 50 years. The development of the viscous damper for piping began in the 1970s when users of nuclear power plants sought a low-cost, maintenance-free alternative to vibration isolators (snubbers). 【Features】 ■ Provides damping force in all degrees of freedom ■ Damping force is transmitted through a viscous material, eliminating mechanical friction and sliding ■ Uses chemically stable viscous materials, ensuring high durability ■ Does not support static loads such as its own weight ■ Does not restrain low-speed movements like thermal expansion *For more details, please refer to the PDF document or feel free to contact us.

• Water and sewerage pipe fittings

We would like to introduce our "Vibration Control Measures for Presses and Hammers." Presses and forging hammers used in metal forming generate significant kinetic energy, part of which is dissipated into the ground, resulting in high vibration levels. In presses, vibrations are primarily generated by the instantaneous release of stress occurring in the press frame during the metal forming process. By utilizing our viscous damper "VISCODAMPER built-in coil spring type vibration isolation device" for direct support, it is possible to reduce the foundation, thereby cutting costs and construction time. 【Features】 ■ Reduction of heavy foundation blocks enables savings in construction time and costs. ■ Vibration-sensitive equipment can be installed adjacent, improving production efficiency. ■ Compared to conventional methods, vibration reduction is achieved by at least 80% for hammers and 90% for presses. ■ The viscous damper contributes to improved machine stability and vibration isolation effectiveness. ■ Level adjustments for presses and hammers due to foundation settlement or tilt are made easy. *For more details, please refer to the PDF document or feel free to contact us.

• Earthquake-proof and vibration-damping equipment

This is an introduction to our "Vibration Control Measures for Diesel and Gas Generators." Large gas and diesel generators are used for various applications. The main objectives of vibration control measures in this application are to reduce the transmission of vibrations from the engine, which is the source of vibration, to the surrounding environment, and to decrease raw material costs and construction time by reducing the size of the foundation. Our vibration control devices are composed of metal coil springs and viscous dampers, and are placed under the frame where the engine is located. [Features] - Vibrations transmitted from the engine to the ground are effectively eliminated. - Dynamic forces applied to the foundation are reduced. - Durable coil springs and viscous dampers. - Forces applied to the installation site are limited to almost static forces. - Height adjustments can be easily made by adding shims to the spring elements. - Both vibration control and seismic isolation effects can be achieved simultaneously. *For more details, please refer to the PDF document or feel free to contact us.

• Earthquake-proof and vibration-damping equipment