DRIVEN STEEL PILING

A range of steel sections can be used for piles. The most common are tubes, universal columns (or H piles) and rectangular hollow sections. Driving piles, as opposed to drilling bores, can be advantageous because the soil displaced by driving the piles compresses the surrounding soil, resulting in greater friction against the sides of the piles, thus increasing their load-bearing capacity. In addition, as driving a pile displaces the soil rather than removes it, there is no cost of spoil disposal incurred. This can be particularly beneficial if the soil is contaminated.

A wide range of sizes of steel tube (or pipe) is commonly available and Piling Contractors have experience in driving tubes from 350 mm to 1500 mm diameter with wall thicknesses from 7 mm to 25 mm.

Tubular piles can be driven with either an open bottom end or closed end. When driven open end, soil is allowed to enter the bottom of the tube. If an empty pipe is required, an auger can be used to remove the soil inside following driving. If the soil is suitable internal cleaning could also be carried out by water jetting.

Closed end pipe piles have the bottom of the pile sealed with a steel plate or cast steel shoe. When driving through hard strata pile toes may be reinforced with a secondary driving shoe to assist penetration and minimise pile damage.

The structural capacity of tubular piles is primarily calculated based on steel strength and concrete strength (if filled). Corrosion can be dealt with by application of protective coatings, by allowing a sacrificial thickness of steel or by adopting a higher grade of steel than otherwise needed.

Steel tube piles can either be new steel manufactured specifically for the piling industry or reclaimed steel tubular casing previously used for other purposes such as oil and gas exploration. Most steel tube piles can readily be spliced to provide greater depth capability than a driving rig can accommodate.

H-Piles and Universal Columns (UC’s) are structural beams that are driven in the ground for deep foundation application. They can be easily cut off or joined by cutting and welding. If a steel pile is driven into a low pH soils or where water flows readily then there is a risk of corrosion, coal-tar epoxy or cathodic protection can be applied to slow or eliminate the corrosion process.

Sometimes a combination of steel tubes and steel piles are used to make a “combi wall” this benefits from the strength properties of tubular piles but at reduced materials cost.

Piling Contractors installs driven steel piles up to 1500mm diameter, up to 50m in single lengths and at rakes of up to 1 in 3.

The processes consist of pitching and driving in a fixed land based leader or free driving piles with rope suspended hammers. Use of fixed leaders allows greater control of position and verticality.

When working over water the same installation processes are used or piles can be driven through our rotating marine leader which can traverse in all directions on and grid arrangement and rotate 360 degrees to pick up any pile on rakes up to 1 in 3 within a defined grid arrangement.

This article comes from PILINGCONTRACTORS edit released

STEEL PILES

The use of steel piles has increased significantly in residential and non-residential construction, especially where there are difficult ground conditions and structures are subjected to heavy concentrated loads.

Our versatile range of steel pile dimensions and products allow you to select the optimal size and length of pile for all soil conditions. Steel piles can be installed using light equipment, which conserves the environment and reduces excavation need and costs considerably.

Build stronger with high performance RRs and RDs steel piles

Our high-strength RRs and RDs piles, in combination with efficient designing, easy and quick installation, lower environmental impact than traditional piling create a solution that is now stronger than ever. By using the higher steel grade S550J2H, the pile’s load-bearing capacity can be added by 25% over that of steel grade S440J2H. The increased load-bearing capacity of the pile can be utilised by decreasing the number of piles. For the customer, this means a significant improvement in the overall economy of the project.

Ruukki’s CE marked steel piles

Ruukki have CE marking, based on European Technical Approval (ETA-12/0526), which is the most comprehensive CE marking to be granted to pile structures made of structural steel. It covers the entire pile structure, manifests the requirements and conformity of the mechanical splices, and establishes that the product has been manufactured specifically for piling.

Ruukki is the only steel pile manufacturer whose pile products are CE marked, inclusive of all the components. The approval covers the steel pipes of the piles, the steel grades developed for the piles, pile accessories and engineering work.

RRs125/6,3 pile (D = 127 mm, t = 6,3 mm) conforms the requirements of the CE marking and shall be added to it. VTT statement no VTT-S-08703-13: “The pile size meets the criteria given in ETA-12/0526”.

Applications:

House foundations
Underpinning of building foundations
Road construction
Railway construction
Harbour construction

This article comes from RUUKKI edit released

Hot Rolled Steel Sheet Pile Sections

Hot rolled steel sheet pile sections have a connection “interlock” at both ends of the section. These interlocks connect with one another to form a continuous wall of Sheet Piling. Soil conditions may allow for the sections to be vibrated into the ground instead of being hammer driven.

Typically hot rolled steel sheet piles are designed to create a rigid barrier for earth and water, while resisting the lateral pressures of those bending forces. The shape or geometry of a section lends to the structural strength.

In addition, the soil in which the section is driven has numerous mechanical properties that can affect the performance. The wall of sheeting provides excellent resistance to bending forces and is used to provide structural strength to a foundation.

U Sections
U shaped sheet pile sections are well proven in both permanent and temporary works throughout the world. Our L and STU series U sections are available in 750/700/600/500mm system widths. All U sections incorporate well-known and efficient Larssen interlocks and offers excellent sealing application.

Z Sections
Z Sections: Continuous form of the web and location of the interlock symmetrically on each side of the neutral axis provides positive influence on the section modulus on the Z section.

Special Sections
Flat sheets, Larssen L430 sheet pile sections and box piles are all types of special sections. Find out their special capabilities and how you can use them in construction.

Corner Sections
Our Corner Sections To find out more and to receive a free consultation e-mail us or call us at 1300 764 164 .

Steel Grades for Steel Sheet Piles
Conditions of supply Hot rolled steel piles are supplied according to DIN EN 10248, cold roll formed piles according to DIN EN 10249.

This article comes from ThyssenKrupp Steelcom editor released

Elaborate on Steel Sheet Piling

Steel sheet piles are long structural sections with a vertical interlocking system that creates a continuous wall. The walls are most often used to retain either soil or water. The ability of a sheet pile section to perform is dependent upon its geometry and the soils it is driven into. The pile transfers pressure from the high side of the wall to the soil in front of the wall.

There are permanent and temporary applications. Permanent sheet piles remain in the ground and serve as permanent retaining structures. Temporary sheet piles are designed to provide safe access for construction, and are then removed.

Hot rolled and cold formed are two primary methods of manufacturing sheet pile. While there are key differences between these two methods, the most important distinction is the interlock. Since hot rolled sheet piles are produced from steel at high temperatures, the interlock tends to be tighter than its cold formed counterpart. Normally, looser interlocks are not recommended in extremely hard driving conditions or for walls requiring low permeability. Hot rolled sheet piles are generally larger and have a broader range of strengths than cold form sheet piles, but there is a large overlap between the two, especially in the most common sizes.

This article from the Skyline Steel editor released

Cold-rolled sheet can usher in “a new stimulus appliances” opportunity?

China Steel News: 2008, the state has launched Home appliances, trade, energy-saving PWM air conditioning subsidies and other policies to stimulate consumption, which greatly release the spending power of urban and rural residents. In subsequent years, the domestic appliance industry showed speeding growth situation, many household electrical appliance enterprises with annual revenue growth rate remained at around 40%. Since the second half of last year, home appliances gradually withdraw stimulus policies, the appliance industry to save gradually doldrums, sales greatly reduced, but closely related with the steel industry is also in “dire straits”.

Impact on the steel market exit appliance stimulus

In January this year, the domestic appliance market bleak, TV, air conditioners, refrigerators, washing machines there was a substantial decline in sales. Appliance industry as in previous years did not achieve a good start.

Monitoring data show that in January, sales of 4.221 million TV terminal units, down 22.4 percent. The second half of last year, TV sales 22,490,000 units, an increase of 16.1% compared with the first half of the sales. This month refrigerator 667,300 units were sold, down 20.8 percent. Washing machine sales in January 994,600 units, down 37.9 percent. More severe case of air conditioning products, the monthly total sales of 333,400 units, down 45.7 percent.

According to past experience, the largest home appliance is cold-rolled steel sheet pile, hot plate two products, galvanized sheet, color coated and stainless steel consumption, although not much, but also belong appliances conventional timber. According to statistics, the cost of steel air conditioning accounts for an air conditioner material cost ratio exceeds 40%, 30% steel washer material costs accounted for 25% of the refrigerator is the cost of materials. A twin washing machine consumes six kilograms of cold rolled sheet pile, cold rolled sheet consumption of a washing machine drum is 10 kg; the amount of cold-rolled stainless steel is also increasing in the washing machine, a washing machine drum is generally cold-rolled stainless steel consumption around 10 kilograms.

If based on the above statistics to calculate it, in January, this is just a washing machine, you should be 13.71 million kg less cold-rolled plate. At the same time, the volume of domestic cold January almost dropped to the freezing point. Although access to March, the national market is cold rolled version pull up trend, however, rises not large, and still have not seen a lot due to lower demand for the release, rises gradually shrink. The most recent days, the domestic cold rolled prices have gradually appeared stable, turnover is still weak, businesses confused situation.

Whether the home appliance industry can usher in a new stimulus?

After the domestic appliance stimulus gradually withdraw, many appliance business executives have expressed the hope that the Government will introduce a continuation of the policy. However, the National People’s Congress, chairman of Hisense Group A motion yesterday was “shelling” support policies that support the current policy does not require the home appliance industry. Clearly, whether the new policy should be introduced on a dispute industry professionals likely to continue.

However, I believe that external demand fade, national efforts to stimulate domestic demand under the backdrop, is expected to introduce new stimulus policies will, however, when introduced? In what form? There are a lot of uncertainties.

If after the “two sessions”, or “two sessions” to introduce new stimulus, may give the steel city to inject a “tonic.” Because in the context of the property can not relax, appliances intended policy of stimulating domestic demand may become a hot media hype, but also to boost confidence in the market. (China Steel News Center Xiu Chan)

This article comes from Europe Pudong Steel, editor released

Trench Design and Construction

Excavation should proceed upgrade, and excessive runs of open trench should be avoided. Principal considerations in trench construction are trench width, stability of the native soil supporting and containing the pipe and its embedment soil, stability of trench walls, and water accumulation in the trench. If the trenching conditions present construction problems such as trench sidewalls that readily slough off or a soft trench floor that will not support workers or compaction, the trench is termed “unstable”, and is more likely to occur in trenches excavated below the groundwater level. Stability can be improved by de-watering, such as by deep wells, well points or sump pumps placed in the trench. In very weak ground (such as loose fine sands or silts with low blow counts or soft clays with low unconfined compressive strength) it may be necessary to employ special procedures such as a “wide” trench or permanent trench sheeting to provide proper support to the embedment material.

The trench floor must have sufficient stability and load-bearing capacity to present a firm working platform during construction to maintain the pipe at its required alignment and grade and sustain the weight of the fill materials placed around and over the pipe. The trench bottom should be smooth and free from sloughed sidewall material, large stones, large dirt clods, frozen material, hard or soft spots due to rocks or low-bearing-strength soils, and any other condition that could lead to non-uniform or unstable support of the pipe. The trench bottom must be kept dry during installation of the pipe and the embedment materials. All foundation and bedding materials must be placed and compacted according to the design requirements.

In unstable soils where the trench floor does not support the weight of the workmen, over-excavation and replacement of unstable soil with more stable material may provide a sufficient foundation. Appropriate bedding material should then be placed on the foundation. In extremely weak soils (such as saturated, loose sands, organic silts and peats) further over-excavation or other special treatment may be required.

To control deflection, the embedment material must be placed from undisturbed trench sidewall to undisturbed trench sidewall. Where trench walls are unstable, it may be necessary to use trench shields, bracing, or permanent sheeting to achieve a stable sidewall while installing the pipe. Walls of trenches below the elevation of the crown of the pipe should be maintained as vertical as possible. The shape of the trench above the pipe will be determined by the stability of the trench walls, excavation depth, surface loadings near the trench, proximity of existing underground structures, presence of groundwater or runoff water, safety and practical considerations. When trench walls are shored or otherwise stabilized, the construction scheme must allow for the proper placement and compaction of pipe embedment materials.

(This article comes from Plastics Pipe Institute editor released)

Working Procedure —— Traditional Sheet Pile Shoring System For Trench Protection

1. Make sure that the trench line is carefully and professionally protected on both sides to avoid any accidents.

2. Check the trench line for existing underground utilities (cables and cable ducts, water and gas pipes, sewerage pipes, etc) and remove them before commencing any other work.

3. Remove any pavement (concrete or asphalt) and any other obstacles.

4. Provide trench sheets and/or sheet piles of sufficient length, section modulus and quantity along the trench and drive them by the selected hydraulic vibrator or impact hammer to the designed installation depth.

5. Start excavation with a suitable hydraulic excavator of sufficient operating weight and boom length. Excavation depth in this first step will be done ~300 mm deeper than the first layer of horizontal waler beams.

6. Lift the waler beams of designed section modulus and length into the trench at both sides and fix each beam by two safety chains (which are hooked to the top of the trench sheets/sheet piles) to the correct position and the designed trench depth. Observe that the waler beams (H- beams) are perfectly placed horizontally in longitudinal and crosswise trench direction).

7. Lift the trench struts or other bracings of designed buckling strength into the trench and fix them carefully between the beams. Each pair of beams has to be supported by at least two bracings according to the design. Make sure that the struts or bracings are correctly extended and fixed to the beams.

8. Continue to excavate the trench to the final depth and repeat steps 5, 6 and 7 in case that more than one layer of waler beams and bracings are required according to the approved shoring design.

9. After laying the pipe or culvert the trench has to be filled-back and compacted in layers according to project specifications whereby also the bracing system (waler beams, trench struts and safety chains) will be removed in steps.

10. After reaching the top backfill level extract the trench sheets or sheet piles by a suitable hydraulic vibrator (add-on vibrators, Mobilram piling rig or crane-suspended vibrator).

11. Clean the locks of interlocking sheet piles and store them carefully for next use. If piles are damaged (at the top by the vibrator clamp and at the bottom by stones or bolders during driving) cut the damaged length and make sure, that the locks can interlock again.

 

ATTENTION:

WORKING AT SITES WITH HEAVY LIFTING AND DEEP TRENCHES CAN BE DANGEROUS. THEREFORE MAKE SURE THAT ALL HEALTH AND SAFETY PRECAUTIONS ACCORDING TO THE HEALTH AND SAFETY MANUAL ARE STRICTLY OBSERVED!

(This article comes from IMECO Austria editor released)

Traditional Sheet Pile Shoring System For Trench Protection

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The traditional sheet pile shoring system for open-cut trenches, manholes and shafts need the following three main items:

1. Vertically installed trench sheets (overlapping) and/or light and heavy sheet piles (interlocking) which are driven and extracted by a suitable pile driving equipment.

2. The bracing system which includes one or more layers of horizontally placed H-beams (waler beams), cross bracings (mostly trench struts or beams with spindle heads) and safety chains to secure the H-beams in horizontal position.

3. The equipment to drive and extract the trench sheet or sheet piles which can be

a) Hydraulic add-on vibrators which are mounted to an excavator boom instead of the bucket and connected to the hydraulic system of the base machine (hammer line).

b) Telescopic piling rigs type Mobilram or equivalent consisting of an excavator-type carrier, a telescopic mast with automatic verticality control and a hydraulic vibrator.

c) Hydraulic vibrators with power pack suspended from a crawler crane.

If hard layers are encountered (SPT>50) a hydraulic impact hammer may be used to drive the trench sheets or sheet piles through the hard layer and get the piles to the designed level. In some cases it might be necessary and/or feasible to pre-drill hard soil to enable pile driving.

All parts of the sheet pile shoring system have to be designed according to actual site conditions (i.e. pipe length and diameter, excavation depth, soil and groundwater condition, additional side loads, etc) and approved according to international standards (EN, DIN or BS) to withstand the active earth pressure and to provide maximum safety for anybody working inside the trench.

In most cases a suitable ground water control system (submersible pumps, vacuum wellpoints or deep wells) must be foreseen to lower the ground water level temporarily to provide a clean and dry working environment at the trench base and to reduce the water pressure to the shoring system.

(This article comes from IMECO Austria editor released)

Trench Sheet

Trench sheets are designed to support vertical faces of small to medium excavations. Trench sheeting can be installed by excavators with Quick Release Shackle through the slinging holes at end of the sheet. Trench sheet piles are driven with a Driving Cap, which prevent trench sheets from damages. Extraction Clamps can protect the sheet when extracted. We can offer a complete services, from trench design, production and supply, until excavation and extraction, driving, installations. China sheet piling are normally used to support earth banks to protect the workers and are ideal for waterway banks mainly because trench sheeting‘s strength, speed of installation and flexibility. Sheet pile products can also be used many times because they can be extracted easily without any shape deformations.

Steel trench sheets can be supplied in a variety of profiles and length and steel grades. Overlapping trench sheets are without interlocks. While interlocking trench sheeting is like other kind of sheet piles, connected with interlocks. Since trench sections are also produced from cold rolling technology, so any sections can be produced, like RC sections etc.

Our Advantages:

Ø The Trench profile sheet pile is a light weight trench sheet with simple overlap connection. Designed for fast re-uses with low strength requirements, such as pipeline installation
Ø Actual re-uses will be determined by trench sheet pile length, and pile conditions.
Ø Especially popular in Middle east countries, Australia, where soils are not so hard.and we can do the sheet piling design, sheet piling calculation,sheet pile costs. etc for our clients

Contenção com Estaca Prancha

As estacas-prancha podem funcionar com cortinas de contenção provisórias ou definitivas formadas por perfis, que podem ser de madeira, concreto, geralmente metálicos, justapostos e cravados no solo. É uma solução para a contenção vertical. Deve ser calculado uma ficha mínima contra o tombamento da estrutura e o perfil deve ser dimensionado de tal forma que resista aos esforços. Em obras de infraestrutura, são aplicadas em terminais portuários, passagens de nível em vias e rodovias, contenção para valas de rede de água e esgoto, além de proteção de acessos a túneis, por exemplo. As estacas-prancha formam uma contenção semi-impermeável e podem ser aplicadas de forma definitiva ou provisória. Para um projeto de contenção. Para estudo caso a caso sempre é necessário fazer uma sondagem geológico-geotécnica prévia do solo para que se conheça os parâmetros envolvidos. Confira detalhes do sistema.

É uma contenção vertical empregada desde o início do século passado e que, com o passar do tempo, foi aprimorada, com a aplicação de grandes guindastes dotados de martelos de vibração que cravam as estacas fazendo-as descer pelo próprio peso do martelo somado a sua vibração o que facilita romper o atrito lateral do solo junto a estaca prancha incorporando maior produtividade e segurança ao serviço.

Esta tecnologia pode ser utilizada de forma provisória ou permanente.

Em obras de infraestrutura, é aplicada na construção de túneis e de passagens de nível em vias e rodovias, em contenção de trincheiras para execução de obras de serviços públicos (gás, esgoto, águas etc.), além da construção, expansão e recuperação de portos, canais,e lagoas. As estacas-prancha são aplicáveis em quase todo tipo de solo.

(This article comes from LAN – LUIZ A. NARESI JR editor released)