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2024/02/18

Precautions for selecting filling media for rubber dam bags

Precautions for selecting filling media for rubber dam bags

Rubber dams, as a new type of water retaining structure, have been widely used in China since the 1990s. The top of the rubber dam can overflow, and the height of the dam can be adjusted according to needs, controlling the upstream water level, and exerting irrigation, flood control, and tide blocking functions. The rubber dam bag adhesive tape is mainly made of high-strength Synthetic fiber as the stress skeleton, with rubber coated inside and outside as the protective layer. The filling medium of the dam bag is mainly water and gas. How to choose dam filling media to achieve safe, reliable, and economically reasonable purposes requires consideration of multiple factors. This article takes a proposed rubber dam as an example to explain the relevant issues that need to be paid attention to when selecting the filling medium for the dam.

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2023/12/28

In addition to the key factors related to the stability and safety of rubber dams

In addition to the key factors related to the stability and safety of rubber dams

In addition to the key factors related to the stability and safety of rubber dams, the most suitable filling medium should also be determined through overall consideration from the following aspects. Flood season dam collapse: The premise of rubber dam construction is not to affect the flood discharge of the river section during the flood season. During operation, it is required that the rubber dam must collapse during the flood season. Due to different filling media, the control of dam collapse is also different. Water filled rubber dams usually require the equipment to be a power source, and they usually use forced drainage to collapse the dam in order to better meet the flood discharge requirements. However, inflatable rubber dams rely on the water pressure during flood discharge to remove gas from the dam, and generally do not consider backup power sources. Relatively speaking, the electromechanical equipment equipped with inflatable rubber dams will save investment. Water filled rubber dams generally have large wells and require a certain groundwater level to ensure the normal operation of the rubber dam. The existing water filled rubber dams even use urban tap water for dam filling due to water source issues, resulting in increased operating costs. In contrast, inflatable rubber dams effectively avoid similar problems. It should be noted that inflatable rubber dams have high requirements for airtightness, and some inflatable rubber dams constructed in the early stages have such problems, causing safety hazards. With the development of science and technology, the problem of air tightness in previously inflatable rubber dams has been solved, and different forms of filling media can meet the functional requirements of engineering.

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2022/02/28

What is the difference between water filled rubber dams and inflatable rubber dams

What is the difference between water filled rubber dams and inflatable rubber dams

The filling and discharging time of water filled rubber dams is longer than that of inflatable dams. In terms of cost, there is not much difference between the two types of dams. The operating conditions of rubber dams are similar to those of water gates, but compared to conventional gate dams, they also have the following characteristics:

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2022/02/28

Inflatable core mold for rubber dams

Inflatable core mold for rubber dams

A rubber dam is a bag type water retaining dam formed by inflating it with water (air) through the filling and discharging pipeline, so the inflatable core mold of the rubber dam is particularly important. Inflatable rubber core mold is a cylindrical bag that can expand and contract, used to form a cavity of concrete components. When manufacturing hollow components, it is placed in the middle and filled with compressed air. When the concrete solidifies, the compressed air in the bag is released, and the capsule shrinks and can be extracted from the cavity. It is easy to use, economical and durable, and can be soft and shrink without inflation. It can be folded or curled at will. After inflation, it has sufficient strength to withstand the pressure of concrete, which is unparalleled by any traditional rigid template. Suitable for extracting holes from reinforced concrete components, including piles, roof trusses, roof panel columns, beams, underpasses, and other components, it is widely used in industrial and mining foundations, highway bridges, construction projects, and hydraulic engineering (docks, shipways, docks). The construction practice has proved that the capsule hole drawing process equipment is simple, which not only saves materials, but also has the characteristics of variable shapes, which can form circular, elliptical, rectangular, arch, Octagon, trapezoid and other pipes. It can also be formed into straight holes, variable cross-section holes, etc., which can make the building structure lighter, thin-walled and hollow, and change the situation where concrete has always used rigid formwork.

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2022/02/28

Advantages of rubber dams

Advantages of rubber dams

1.1 Reducing the Consumption of Building Materials After years of practice in rubber dam construction, the construction of rubber dams can save a large amount of building materials, especially cement, steel, and wood, compared to traditional dams. Usually, it can save more than 50%, ensuring project quality while greatly reducing the investment in engineering construction funds, creating higher economic benefits for the country and construction enterprises. 1.2 Flexible and easy to maintain The water blocking effect of rubber dams is relatively small, with a large span, and the maximum span can reach 900 meters. While reducing the number of gate piers, it increases the effective water crossing section. Moreover, rubber dams have the characteristic of flexible lodging. When floods come, placing the dam bag can ensure that the cross section of the riverbed is not affected. The operation is very flexible, and the opening and closing are also very simple. Simply installing an air compressor or water pump can adjust the height of the dam body, and there is no need to build a working bridge. The process of repairing it is also relatively simple. When the dry season comes, releasing a portion of its internal water can achieve simple maintenance. Unlike traditional gate maintenance work, which requires the construction of maintenance gates, this also greatly saves project investment. 1.3 Simple production method At present, the manufacturing of rubber dams has achieved a factory process. Many enterprises in our country are able to manufacture rubber dams, which are not affected by construction conditions or external environmental factors. Installation is very simple, greatly improving the construction efficiency of dam construction, thereby saving a certain amount of action and achieving the goal of saving funds. 1.4 Good anti-seismic performance Because the dam body of the rubber dam is a flexible Thin-shell structure, which is relatively light and elastic. Moreover, rubber dams do not have high working bridges and lifting frames, making them highly outstanding in terms of seismic performance.

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2022/02/28

Management Measures for Rubber Dams

Management Measures for Rubber Dams

In the process of using rubber dams, in order to prevent their aging and extend the service life of dam bags, it is necessary to pay attention to the inspection work of dam bags. For example, when aging and cracking occur, timely coating treatment should be applied to the location where the crack occurs. At the same time, attention should be paid to the shielding of the dam bag to reduce direct exposure, ensure normal overcurrent, and prevent vibration and wear. Relevant management units should develop an operational management system for rubber dams, gradually explore it in practice, and summarize experience to continuously improve the system. Daily maintenance work is very important. If wear, water seepage, or peeling of adhesive tape is found, it should be repaired in a timely manner to prevent further development of the problem. Under the action of water flow, it can cause vibration and floating of the dam bag, leading to a certain degree of damage to the dam bag. To prevent such situations from occurring, the bottom plate between the downstream anchor line and the collapse line of the dam bag should be poured more smoothly. To do a good job in maintenance and prevent ice rafts from directly passing through rubber dams, spur dikes should be built according to the local wind direction, or iron lines should be set up to block them, to prevent the passage of ice rafts from causing serious impact on the dam body.

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