X

Overview of WT method

WT is a construction method that improves underground spaces, such as parking lots, using the TNF method and creates a water storage tank consisting of walls and a bottom plate in all directions.

Rainwater storage tanks in private facilities are encouraged to be installed under the “Decree on Flood Prevention” established in July 2015, under the guidance of government authorities.

WT construction method can be considered the optimal choice for property owners involved in such projects.

The principle of WT construction method

By forming the contact surface between the bottom plate and the underlying soil, which is soft ground, in the characteristic truss shape of the TNF method, the stability of the structure is maintained even in weak soils. Inside the water storage tank, crushed stones are laid to support the top structure while maintaining a water storage rate of 35% to 40% of the volume.

Characteristics of WT Method

Characteristic 1 : Urban Heat Island Phenomenon Suppression

Suppression of temperature increase due to evaporation latent heat effect by depriving evaporation of stored water.

Characteristic 2 : Effective Land Utilization

Effective land utilization by constructing underground facilities, such as parks, in urban planning sites.

Characteristic 3 : Effective Utilization of Stored Water

Stored water can be used as treated water for domestic use and toilet flushing after filtration and treatment.

Characteristic 4 : Utilization as Firewater

It can be utilized for emergency fire protection and sprinkler systems.

Characteristic 5 : Reduction of Runoff Load into Rivers

Prevention of direct runoff into rivers by storing rainwater flood control effect for rivers.

Advantages of WT Method

Advantage 1 : Easy Construction in Weak Ground

Because it is based on the robust TNF construction method, it is easy to carry out construction even in soft ground or areas with a high water table.

Advantage 2 : Low Cost

When burying rainwater storage facilities underground using this construction method, the improved ground (including 4 improved walls and an improved bottom slab) serves as the container, eliminating the need for retaining wall sheet piling work, reinforcing bars, ready-mix concrete, and formwork construction. With fewer construction steps, it is possible to complete the construction in a shorter time compared to conventional storage facilities.

Advantage 3 : Applicable to the Installation of Various Underground Equipment, Such as Water Tanks and Gasoline Tanks.

The WT construction method allows for flexible shaping and can accommodate installations such as oil tanks and piping facilities inside, in addition to rainwater storage tanks.

WT method application in Vietnam

WT construction method has great potential for solving some problems of waterlogging and water storage in some types of buildings, such as:

  • At supermarkets, hospitals, shopping centers, etc., WT construction method is applied to build rainwater collection tanks right under the yard and parking lot to prevent flooding when heavy rain occurs.
  • WT construction method is utilized on projects with specific features, such as oil refineries and petroleum depots, to construct raw material tanks (gasoline, oil) with a high level of fire and explosive safety.
  • Narrow roads in residential areas that frequently experience flooding impede the access of fire engines to the incident site. To address this challenge, the WT construction method is employed to construct rainwater tanks, which serve as water sources during emergency firefighting scenarios.
  • In green parks, WT construction-method tanks are built to regulate internal air and provide water for irrigation in the dry season.

Cong-nghe-WT-tai-Viet-Nam

WT construction method application for local flooding problems

Flooding problems

At present, significant urban areas throughout the nation are afflicted by prolonged and frequent flooding, which has a direct impact on both the physical environment and socioeconomic progress. Local flooding is predominantly attributed to rapid urban development, which alters numerous natural drainage factors and alters the direction of the drainage basin and foundation slope. As a consequence, during periods of intense precipitation, water accumulates at an alarming rate and is unable to drain in a timely manner, as stated by experts. The matter of how to address the issue of inundation remains unresolved among the pertinent ministries and departments.

WT construction method application for flooding limiting

With our unique and specialized technology, we are consistently prepared and assured to implement the WT construction method on all projects in an effort to reduce inundation in Vietnamese cities. By optimizing design in terms of area and function, WT construction method enables the construction of large-capacity subterranean water containers directly beneath a structure without compromising its structural integrity or operational capabilities. In the event of intense precipitation, the reservoir will absorb nearly all of the water that the surface drainage system is unable to discharge, thereby preventing water from entering the river. By doing so, the risk of inundation is reduced for both the project site and other areas with low-lying terrain. In addition, automatic water absorption, which does not require the use of energy or other apparatus or equipment, reduces reliance on pumps during emergencies such as power disruptions, equipment fires, etc.

Construction of an underground water storage tank applying 

WT construction method at a project in Hyogo Prefecture, Japan

WT construction method application for special projects

Problems with petroleum storage facilities

Petrol and chemicals stored in metal containers must be covered and regulated in accordance with stringent procedures, which is labor-intensive and expensive to maintain due to the year-round heat and protracted drought. Furthermore, the operational challenges associated with optimizing the project’s performance are mitigated by the direct impact that the particular characteristics of the liquids contained within the tanks have on the utility of the adjacent areas.

WT construction method application in manufacturing tanks for petroleum, chemicals, etc.

Recognizing the costs and constraints associated with managing chemical and petroleum storage in open tanks, our goal is to consistently introduce customers to the WT construction method in order to reduce operational and managerial complexity and operating expenses.

The WT construction method utilizes flexible tank shapes, effective insulation, seismic resistance of improved soil, and other features to optimize the use of building area and terrain. This method maximizes liquid storage capacity, reduces the number of tanks, and minimizes the risks of fire and explosion during hot weather. In addition, the tank’s total subterranean placement allows for optimal utilization of surface space for landscape design and supplementary activities, such as exercise facilities, parking areas, tree planting, and the creation of miniature landscapes.

WT construction method application in civil works

Current status of fires in major cities of Vietnam

Fire incidents are on the rise in tandem with the global temperature, predominantly in densely populated areas with inadequate fire prevention and explosive prevention infrastructure. Furthermore, each occurrence is accompanied by heartbreaking reports detailing the unfortunate casualties and the repercussions of the fire. Then, individuals are reminded of the absence of fire prevention measures in apparatus, vehicles, and water sources following each fire incident. Therefore, minimizing fire damage remains a challenging issue for all levels of government and every citizen.

b. WT construction method application in civil works for fire and explosion prevention

When it comes to civil works, particularly in narrow alleyways, the most efficient and expedient method to combat flames is likely through the use of a compact fire extinguisher that utilizes nearby water sources such as wells, ponds, lakes, and so on. Unfortunately, a reliable water supply is not always accessible. In such cases, the only option is to construct an artificial water tank. This guarantees the easy utilization of water during a fire. The WT construction method is ideal for creating artificial tanks used in fire prevention and fighting, as it allows for the design and construction of medium- and large-sized tanks directly beneath the construction foundation.

Furthermore, the WT construction method offers the remarkable benefit of producing tank walls with exceptional strength. This method also effectively mitigates oblique settlement and differential settlement caused by ground displacement from nearby structures, ensuring a high level of safety both during construction and throughout the project’s lifespan.

WT construction method application in indoor air conditioning and green irrigation

In addition to the aforementioned uses, the WT construction method can be implemented in the development of green parks by incorporating a subterranean section that functions as a rainwater reservoir for tree irrigation and interior air conditioning during periods of high temperatures and low humidity.

Other technology

TNF is an exclusive foundation construction technology with low cost, rapid construction time, and numerous other outstanding advantages.

TNF-DD foundation technology is an improvement from TNF-D technology, at a lower price, safer and more secure.

T-BAGS technology with the ability to dampen buildings and insulate cold storage.