The Self-Drilling Hollow Bar Anchor System is comprised of a hollow threaded bar with an attached drill bit that performs 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. Couplers can be used to join hollow bars and extend the bolt length while nuts and plates are used to provide the required tension. The Self-Drilling Hollow Bars are known for their excellent load capacity and are available in Normal (N) and Special (S) types with diameters from 1 to 4 in. (25 to 103 mm).
- Drilling, anchor installation and grouting in single operation
- Separate anchor installation or removal of casing and drill rods is not required
- Similar installation methods for all ground conditions
- Choice of drill bits for different ground conditions
- Hollow core is used for flushing with air or water during drilling along with grouting the anchor tendon
- Flexibility in length by using couplers
- Ability to work with small drill rigs without casing in restricted headroom conditions
- Enhanced corrosion protection available upon request.
(This article comes from JENNMAR editor released)
Rock bolt, in tunneling and underground mining, steel rod inserted in a hole drilled into the roof or walls of a rock formation to provide support to the roof or sides of the cavity. Rock bolt reinforcement can be used in any excavation geometry, is simple and quick to apply, and is relatively inexpensive. The installation can be fully mechanized. The length of the bolts and their spacing can be varied, depending on the reinforcement requirements.
There are three major ways of anchoring the rock bolts: mechanical, grouted, and friction. The most common form of mechanically anchored rock bolt uses an expansion shell. A wedge attached to the bolt shank is pulled into a conical expansion shell as the bolt is rotated. This forces the shell to expand against the wall of the borehole. The two mechanisms by which the shell is anchored against the borehole wall are friction and interlock. A preload can be applied to the rock surface by tensioning the bolt with an attached hanger or face plate, which are designed to distribute the load uniformly onto the surrounding rock.
The most common grout-anchored rock bolt is the fully grouted rebar, a threaded bar made of steel. Cement or resin is used as the grouting agent. A cable bolt is a reinforcing element made of steel wires in the form of a strand or rope; it is installed in the borehole with cement grout.
Friction-anchored rock bolts represent the most recent development in rock reinforcement techniques. Frictional resistance to sliding is generated by a radial force against the borehole wall over the whole length of the bolt.
(This article comes from Encyclopædia Britannica editor released)
1. The Dywidag threadbar is fully threaded and can be cut and coupled at any point .In some countries,it is also called solid bar anchor.This makes transportation and installation of the threadbar anchors much easier. The productivity is 2 or 3 times greater than conventional ground anchor systems.
2.The coarse threads are almost Indestructible, and provide better Adhesion between the threaded bar and grout. This is especially important for rock anchor, soil anchor, rock bolts, form ties, soil nailing,deep fountaion and form work ties.
3. The threadbar anchors can be installed in confined spaces with simple and compact drilling equipment, and does not require land excavation, this is especially important for sheet piling anchor wall and soil nail.
4.The Dywidag thread bar is manufactured from high tensile alloy steel, with minimum yield strength from 500 Mpa up to 1080Mpa. Can be suitable for any soil/rock grounds.
5.The screw threaded bars can be provided with various anti-corrosion options ,Hot dip Galvanizing, epoxy coating ,Single Corrosion Protection(SCP),Double Corrosion Protection (DCP).Plus the cement grout the steel screw bars ,the thread bar anchors can be used for over 120 years. DCP anchor, SCP anchor, and expansion bolts are all available.
(This article comes from china-steelpiling.com editor released)
Aluminum is regularly incorporated in marine structures and fixtures because it is strong and durable. Sheet piles manufactured from aluminum can be used to compliment other components of a development such as architectural features of a waterfront development. CMI aluminum sheet piles are manufactured from 6061 T6 alloy for the best combination of strength and longevity in marine environments..
- lightweight and easy to install
- chemical and corrosion resistant
- great strength to weight ratios
- attractive appearance, can be anodized or painted
- capping and anchorage systems available
(This article comes from J Steel Australasia editor released)
Sheet pile walls are constructed by driving prefabricated sections into the ground. Soil conditions may allow for the sections to be vibrated into ground instead of it being hammer driven. The full wall is formed by connecting the joints of adjacent sheet pile sections in sequential installation. Sheet pile walls provide structural resistance by utilizing the full section. Steel sheet piles are most commonly used in deep excavations, although reinforced concrete sheet piles have also being used successfully.
Steel sheet piling is the most common because of several advantages over other materials:
1. Provides high resistance to driving stresses.
2. Light weight
3. Can be reused on several projects.
4. Long service life above or below water with modest protection.
5. Easy to adapt the pile length by either welding or bolting
6. Joints are less apt to deform during driving.
Sheet pile walls are constructed by:
1. Laying out a sequence of sheet pile sections, and ensuring that sheet piles will interlock.
2. Driving (or vibrating) the individual sheet piles to the desired depth.
3. Driving the second sheet pile with the interlocks between the first sheet pile and second “locked”
4. Repeating steps 2 & 3 until the wall perimeter is completed
5. Use connector elements when more complex shapes are used.
Sheet pile wall disadvantages are:
1. Sections can rarely be used as part of the permanent structure.
2. Installation of sheet piles is difficult in soils with boulders or cobbles. In such cases, the desired wall depths may not be reached.
3. Excavation shapes are dictated by the sheet pile section and interlocking elements.
4. Sheet pile driving may cause neighborhood distrurbace
5. Settlements in adjacent properties may take place due to installation vibrations
(This article comes from Deep Excavation editor released)
1. High strength and light weight
FRP products are much lighter weight than the metal products. Protruded composites are about 30 percent lighter than aluminum and up to 80 percent lighter than structural steel. They can be transported and placed much more easily and much less expensively.
2. Electric insulating
Fiberglass is non-conductive and radio frequency transparent. Perfect for housing electronics without disturbing their performance and protect employees from hazards inside.
3. Cost Effectiveness
Pultrusion is a low cost manufacturing process compared to other process used to create FRP materials. The process of pultrusion is so highly automated that it requires very little manpower, even to run the necessary machinery. According to Pultrusions, 80 to 90 percent of the cost of pultrusion-manufactured material is typically from raw materials.
4. Corrosion Resistance
FRP products have been widely used to manufacture components for structures in corrosion-sensitive processing plants. It is one of the most cost-effective and efficient methods for processing corrosion-resistant products, including such components as I-beams, handrails and walkways. FRP materials offer the corrosion resistance not afforded by the metal construction previously used for these purposes.
(This article comes from Made-in-China.com editor released)
Nowadays, continuous fiber reinforced polymer (FRP) sheet has been sometimes applied for retrofitting and/or reinforcing existing reinforced concrete (RC) members. However, those design procedures have been established on the basis of the load-carrying behavior and debonding characteristics of the sheet for the members without any damages, even though the procedures are for designing the existing RC members. Therefore, in order to establish the rational design procedures for retrofitting/reinforcing the members with high reliability, it is important to investigate the reinforing effects of the FRP sheet on the RC members suffered some damages. Those issues should be efficiently solved on the basis of the results obtained by cooperating with the experimental and analytical studies. Arduini et al. (1997) only tried to investigate those experimentally and numerically.
From this point of view, in this paper, the load-carrying behavior including debonding of FRP sheet of the flexural reinforced RC beams with Aramid FRP (AFRP) sheet was experimentally investigated, in which the girders were preloaded and cracked prior to bond the AFRP sheet on the tension-side surface. Also, proposing a numerical analysis method for this kind of RC girders and performing the numerical analysis, an applicability of the method was discussed comparing the experimental results.
In this paper, both smeared and discrete cracking models are applied. Specially, the discrete cracking model was applied for numerically reproducing the critical diagonal cracks, the diagonal cracks at the sheet-end, and the lower concrete cover delamination. Also, numerically reproducing the damaged RC girders, pre-analisis is conducted prior to bond AFRP sheet on the tension-side surface of the girders. After unloading, adding AFRP sheet elements to the surface under the nodal displacements being stayed behind, the numerical analysis for reloading is conducted. In order to add the FRP sheet elements at reloading, the dummy elements with small stiffness have been prepared at preloading. Here, DIANA code was used for this numerical analisis.
(This article comes from Advances in FRP Composites in Civil Engineering editor released)
Sheet piles can be installed by static pressing with the leader mounted RTG press-system. It works with a minimum of noise and vibration emission. A flexible modular clamp system enables the installation of various U and Z profiles.
- 360° turnable clamps for various Z-profiles with same distance and light profiles
- Shiftable clamps for various U-profiles
- Guide bodies for different profiles
- Expensive “Key-Components” as clamps, cylinder incl. guidance and the complete control unit can be used for all profiles
- Adaption for different profiles by changing the guide body within a short period of time and with moderate additional cost
(This article comes from BAUER PILECO editor released)
CeTeau PVC sheet pipng systems are the new standard with many advantages compared to hard wood, concrete and steel sheet pipng. Vinyl sheet piles are made of poly vinyl chloride also known as PVC, a material with excellent resistance to weather influences and it has a long service pfe. Moreover, the material will not be affected by natural matters occurring in the ground, rodents, and salt or fresh water. PVC sheet pipng has a number of benefits over traditional steel timber or concrete pipng: mainly, cost, durabipty, ease of handpng and reduced environmental impact.
• Does not rot or rust
• Long service pve
• Manufactured from recycled plastic
• Maintains its original appearance over time
• Resistant to the majority of chemicals
• Resistant to rodent and marine borer attack
Vinyl sheet pile installation
• There are a large number of techniques to drive vinyl sheet piles. The system used is largely depending on the circumstances pke:
• Sheet pile length
• Soil conditions
In some situations, particularly when short lengths of Plastic Pipng are being installed, it can be inserted into the ground by hand using a maul and Pile Cap. This is often the case in peat land areas, where the ground conditions are more favorable. When instalpng longer lengths, or where the ground conditions are more difficult, a Pipng Hammer should be used. Driving the sheet pile directly can be done with a standard pneumatic hammer or a pght vibrator with or without a clamp. This system is only suitable for driving at pght conditions and to a pmited depth.
For heavy conditions and installation from 4 m up to 8 depth it is advisable to used a steel support sheet pile with exactly the same shape as the PVC profile. With the support harder soil can be penetrated and installation is speeded up because the hammer does not have to be disconnected from the steel guiding sheet pile.
(This article comes from HelloTrade editor released)
CMI products encompass the latest manufacturing technologies and focus on environmental sustainability – converting plastic into environmentally friendly products. The vinyl plies have 92% recycled content! Vinyl sheet piles and Fibre Reinforced Plastic (FRP) sheet piles have a long design life and they are light weight saving emissions due to transport and handling. In addition to these benefits the products are ideally suited for applications which protect and remediate the environment.
Vinyl and FRP sheet piles can be used for a wide range of applications. They are light weight, chemical and corrosion resistant with excellent hydraulic performance to prevent seepage in cut off or containment applications.
Installation of Vinyl and FRP sheet piles is similar to the installation of other sheet piles. In many cases because they are so light, heavy handling is not required and installation can be done a lot quicker. Piles can be installed with conventional piling equipment; drop/impact hammers, leader and excavator mounted piling vibrators. Simple methods of installation can also be employed; pushing/driving with excavator bucket, driven with a jack hammer, driving cap, water jetting or with an excavator mounted plate compactor. With difficult driving conditions (SPT >25) the use of a steel mandrel with a piling vibrator is recommended to assist with the pile penetration.
(This article comes from J Steel Australasia editor released)