The self-drilling hollow bar anchor system consists of a hollow threaded bar with an attached drill bit that can perform drilling, anchoring and grouting in a single operation. The hollow bar allows air and water to freely pass through the bar during drilling to remove debris and then allow grout to be injected immediately after drilling is completed. Grout fills the hollow bar and completely covers the entire bolt. Couplings can be used to join hollow bars and extend the bolt length while nuts and plates are used to provide the required tension.
Self-drilling hollow bar anchor system is the most common used system for rock mass stabilization, especially in tunneling, underground mining and ground engineering industry. It is mainly used for the supporting engineering in the loose and broken rock stratal with difficult to drilling hole. It provides the optimal solution for soil nailing, lock bolting, micro-piling.
Self-drilling hollow bar anchor system fulfills current and increasing demands of the tunneling, mining industry and ground engineering for safer and faster production. The system provides advantages for all areas of its applications, where boreholes would require the time consuming drilling with casing systems in unconsolidated or cohesive soil.
(This article comes from ACEDRILLS editor released)
Sheet piling is an earth retention and excavation support technique that retains soil, using steel sheet sections with interlocking edges. Sheet piles are installed in sequence to design depth along the planned excavation perimeter or seawall alignment. The interlocked sheet piles form a wall for permanent or temporary lateral earth support with reduced groundwater inflow. Anchors can be included to provide additional lateral support if required.
Sheet pile walls have been used to support excavations for below grade parking structures, basements, pump houses, and foundations, construct cofferdams, and to construct seawalls and bulkheads. Permanent steel sheet piles are designed to provide a long service life.
Vibratory hammers are used to install sheet piles. If soils are too hard or dense, an impact hammer can be used to complete the installation. At certain sites where vibrations are a concern, the sheets can be hydraulically pushed into the ground.
Sheet piles are also a sustainable option since recycled steel is used in their construction, and the piles can often be reused.
(This article comes from Hayward Baker editor released)
Changzhou channel management informed Dan Kim Li River Caohe Jintan paragraph three part revetment Channel Improvement Project will use high-strength, light weight, corrosion resistance and other advantages of fiberglass-reinforced composites (FRP) sheet pile light revetment structure. Such new materials, new technology in our inland waterways is the first time, had only been used in parts of the US and European countries.
It is understood that glass fiber reinforced composites (FRP) sheet pile solves the traditional reinforced concrete, corrosion of steel revetment structure, reduce maintenance cost structure and improve the durability of the structure, enhance the security of the structure.
In Jintan Dan Dan Kim Jin Li River Caohe lock downstream segment of $ Xiangcun combined Dan Li River Caohe gold dredging earthwork comprehensive utilization of channel regulation formed an ecological island. But because the land was abandoned out of the waters of the heap, the poor stability of embankments and flood runoff upstream of the larger reasons for anti-erosion ability revetment embankment demanding, traditional stone masonry or concrete revetment structure can not apply. Often combined with state fairway at Nanjing University to explore and study the use of new materials in the construction segment revetment structure.
Vinyl sheet piles, Fibre Reinforced Plastic (FRP) sheet piles and Aluminium sheet piles are manufactured by Crane Materials International (CMI) in similar shapes and section modulus to steel sheet piles. There are Z profiles, Box profiles which are a U shape with the clutch on one side of the wall (also referred to as Omega profile), a Pan profile and a Flat profile.
The key difference between the synthetic non ferrous sheet piles and steel sheet piles is the bending strength. The key advantages are that these sheet piles are lightweight, and chemical and corrosion resistant making them ideal for a wide range of applications. Vinyl and Aluminum are homogenous materials so design can be carried out in a similar manner to steel. FRP sheet piles are composite products which require different considerations in design.
(This article comes from J Steel Australasia editor released)
Basically, three methods are used:
The most commonly used method, in which sheet piles are mechanically pressed into the soil with the use of vibratory hammers along the pre-installed templates. In order to fully protect the piling against damage, light equipment with small impact energy is used. The type of the equipment used is dependent on the type of soil, the depth of the cavity and the durability of the sheet pile. The key to a successful installation in hard, dense surfaces, and in ramming long elements, is the use of special guide bars called mandrels. Side or front mandrels work best. You can also use multiple mandrels that allow you to mount several pilings at the same time. This is a steel element in the shape reflecting the rammed vinyl sheet pile. Mandrel length must match the length of the rammed PVC elements.
It is used for very compact or cohesive soils. Sometimes, in certain conditions, the vibration hammers used for the driving method, do not have enough force to install the vinyl sheet piling on the required depth. It might be caused by a variety of obstacles encountered in the soil, but in some cases the soil itself might be too tough for lightweight equipment. Jetting allows to create pressure directly under the installed sheet piles, which loosens and removes the soil or the obstacles. Special water or air ejectors are applied in this technology.
This method is usually used, when the depth of the constructed wall is relatively small. Quite often it is chosen for stony ground, which does not allow to employ driving or jetting technology. The plastic piling is installed in a ditch, which is then filled (on both sides) with special bedding layer selected for the project. Mechanical or chemical hardening of the bedding should be performed as well.
(This article from the vinylpiling website editor released)
According to the research & manufacture of high strength steel tie rod for engineering, piled up abundant experience at the choice of materials,heat treatment technics and examination of mechanical property,also made a innovation of technics and technique,realized to make in china, met the request of engineering.
Works with the high strength steel tie rod, is supporting the project in order to meet domestic demand for many high strength steel tie rods. None of the products in the country, mainly on the case of imports, to revitalize national industry and broke the UK, France, Germany, Luxembourg and a few other countries on the international market monopoly steel rod, making the domestic steel rod in the domestic market has been applied to the into the international market.
High strength steel tie rod construction projects as the main force components for use in all types of construction projects abroad are more common. Domestic high strength steel tie rod (mainly refers Rel≥460Mpa than steel rod) all rely on imports, only the general strength of the steel rod (relative to Rel≥460Mpa steel rod, mainly refers Rel≥235Mpa, Rel≥345Mpa steel trolley) in a few domestic manufacturers, the lack of competitive advantage.
Through the development of high strength steel tie rod products, made in the choice of materials, heat treatment process, forging process, tensile testing, such as a major breakthrough, and created a number of technological achievements of high strength steel tie rod. The successful development of high strength steel tie rod overall performance has reached and exceeded the international advanced level of similar products.
In recent years, offshore deepwater dock project has been massively constructed at home. As a major deep-water pier pile bearing capacity, spiral weld large diameter steel pipe piles and straight seam steel pipe commonly used. In addition, bridges, roads and high-rise buildings also need pipe piling.
Pipe weld surface shall not have cracks, broken arc, craters and holes and other defects. Presence of the defective welds allow welding, grinding or repair defects allowed. Butt weld steel pipe can be steel belt. Steel allows two pipe sections butt together. Butt welding can use submerged arc welding or manual welding process.
Pipe piling’s main production process is mainly double submerged arc welding technology. The first advantage is fully automated. The second advantage, which is carried out under the submerged arc welding, so it’s the heat exchange and protection of relatively strong performance, high quality welding out. The third advantage, because of submerged arc welding arc welding flux buried underneath, it can use high-current, high welding efficiency.
Recently, the representative of Japan’s Haneda Kosan Co., Ltd. went to Tianjin West Shares for an on-the-spot investigation. They had business meetings about the matters of Japan’s exports of steel sheet pile, and reached a long-term strategic cooperation. Japanese businessmen have to Jinxi Steel Plant H shares, H-shaped steel sheet pile Plant production site and finished products to conduct a comprehensive study of steel sheet pile. They learn more about Jinxi rolled steel sheet piling‘s production, and spoke highly of the level of internal control that the hot-rolled steel sheet pile either from the physical geometry of the surface quality and physical appearance or packaging are second to none in the world. Businessmen expressed great satisfaction, and signed on the spot of steel sheet pile sales orders. Japanese businessmen said when the steel sheet pile of this order shipped to Japan they were ready to invite major Japanese companies to observe piling piling process in order to increase the promotion and application of hot-rolled steel sheet pile in Japan.
What is the difference between Hot Rolled and Cold Formed Sheet Piles?
The main difference lies in the process of which the piles are being produced. Hot rolled sheet piles are produced directly in hot form from a beam blank into its final shape. Cold Formed Sheet Piles on the other hand uses Hot Rolled Coils to roll them under pressure into its final shape in cold (room temperature) forming state. As hot rolled sheet piles are formed under heat, complex interlock shapes are therefore possible however for Cold Formed Sheet Piles, it will just be a simple hook and grip type interlock. Due to the investment required for Hot Rolled Sheet Piles and its associated machinery, there are few mills in the world who can produce such sections. EN Standard Piles are mostly produced in Europe while JIS standard Hot Rolled Sheet Piles are produced in Asia.
Feedstock of Cold Formed Sheet Piles are Hot Rolled Coils and they are largely available worldwide. Due to this availability, Cold Formed Sheet Piles are normally more readily available in lead time and are produced closer to your project location. Furthermore, the ability to buy different types of width and thickness of coils, gives Cold Formed Sheet Piles the added ability to customize new sections and shape which could be optimized to save on weight.
Are Cold Formed Sheet Piles Equivalent to Hot Rolled?
Essentially, yes they are equivalent in sections. All sheet piles are designed based on their sectional properties such as section modulus, moment of inertia and steel grade. Hence, for the same bending moment capacity of each pile, whether Hot Rolled or Cold Formed, they should perform with the exact same characteristics.
This article comes from Mer Lion Metals editor released
Due to historical reasons, China’s annual consumption of steel sheet pile less than 100,000 tons, accounting for only one three-hundredth of the world. By South Korea and the Soviet Union in the past, the market is mainly in the majority with u-shaped steel sheet pile, but Z-type is seldom used. And generally designed by foreigners direct application in the permanent building foundation.
With the development of China’s industrialization process, steel sheet pile in the domestic applications are more and more frequently, and the demand is growing. But at the same time the start-up of steel sheet pile industry has many deficiencies and worth exploring at groping stage.
Currently, the domestic demand mainly rely on imports. Now, there are some domestic cold-formed steel sheet pile manufacturer. Cold-formed steel sheet pile is mainly used in the latent Pit. It is strong alternative to the hot-rolled steel sheet pile because of the cheaper costs. However, due to the impact bent the thickness and locking technology and other factors, led to an increase in weight, the accuracy is not controlled formation of irreparable flaws. So it is lack of the necessary conditions for a wide range of promotional applications.
Gap is the potential. China’s economy is currently in a period in the history of the development. According to research, The next 10-20 years, the transformation of our country’s infrastructure and Riverside waters seaward regions sheet piles will provide a broad application space.