Sheet piling contractors – Grand Piling

Sheet piling is an earth retention and excavation support technique cta-bestchoicethat retains soil or water, using steel sheet sections with interlocking edges. Sheet piles are installed in sequence to design depth along the planned excavation perimeter or seawall alignment.

Sheet piling is laying a series of panels with interlocking connections and driving them to the ground so as to form an impermeable barrier. The interlocked sheet piles form a wall for permanent or temporary lateral earth support with reduced groundwater inflow. Permanent steel sheet piles are designed to provide a long service life. Anchors can be included to provide additional lateral support if required.

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.

This article comes from dvhindustries edit released

Sheet Piling Solutions

PilePro’s Side-Grip Vibratory Piling Hammer is an excavator mounted vibratory hammer which grips the pile on the side in order to be able to drive sheet piles up to 18m long. This one unit is capable of handling, pitching and driving sheet piles, therefore eliminating the need to manually handle piles or use assisting machinery.

The Vibratory Hammer combined with the excavator is an effective solution for sheet piling on most sites from open areas to confined spaces or limited headroom. An advanced Auto C control system makes operating accurate and simple.

PilePro’s Side-Grip Vibratory Piling Hammer is capable of handling, pitching and driving 400 – 1,200 mm width sheet piles up to 18 m long.

The side-grip clamps make installation efficient having the ability to lift and rotate the pile to the driving location. Secure grips keep the pile under control during driving and the Auto C control system enables fast and accurate piling work.

Generating an impressive 600 kN of vibratory force at 3,000 Hz, the Vibratory Hammer can only be bettered in power by the very largest crawler mounted rigs limited in availability to the bigger mainland cities.

Key features:

  • minimised disturbance to surrounding structures through the use of variable eccentric vibration; effectively eliminating start-up and stopping resonance and potentially damaging vibration.
  • equally able to install and extract piles, and therefore perfect for installation and later removal of temporary works.
  • operates at any angle and therefore capable of installing piles at any rake including horizontally.

The Side-Grips will drive sheet piles in width from 400 to 1200 mm.

PilePro have also invested in sheet piles that are available for hire and use in temporary works to further improve the viability of sheet piling solutions. Our ability to recover piles is unique in Tasmania and allows for the re-use of materials.

(This article comes from PilePro editor released)

Protection of Steel Sheet Pile Bulkhead Using Precast Concrete Veneer

An industrial yard owned by the United States Army Corps of Engineers (USACE) is located at the Caven Point peninsula in Jersey City, New Jersey. The yard’s berthing waterfront is built in the form of steel a sheet pile bulkhead. The sheet piling, subject to the aggressive salt water environment, has severely corroded since the time of construction in the early 1970s; however, the degree of corrosion of the steel sheeting varied a great deal over the wall height. The most severe corrosion occurred within the tidal zone with its peak being at the Mean Low Water level (MLW). About 15% of the original steel thickness was left at this level. In other zones, where the sheet piling was either permanently dry or permanently submerged, the remaining steel was 80 to 90% of its original thickness. Structural analysis of the bulkhead showed that the maximum bending moment occurs approximately at the level of mudline, where the section loss of the sheet piling due to corrosion was minimal. At the MLW level, where the sheet piling sustained the maximum corrosion loss, the bending moment, on the contrary, was small and the remaining steel thickness was found sufficient to resist it. Consequently, it was determined that the bulkhead in its existing condition was structurally adequate; hence, the goal of its rehabilitation was merely to stop further corrosion and to preserve the sheet piling in its present condition. Protection of the sheet piling has been designed as 20-cm (8-inch) thick precast concrete panels (veneer) installed in front of the existing wall. The space between the sheet piling and the panels would be filled with plain tremie concrete. To make the concrete panels capable of withstanding the lateral pressure of the wet concrete fill, two measures have been proposed: a) use of the lightweight concrete fill, and b) placement of the concrete fill between the sheet piling and panels in several lifts. Each subsequent lift would be placed after concrete in the previous lift has hardened and thus no longer transmits lateral pressure to the panels.

(This article comes from ASCE Library editor released)

PZC™ – Lighter, Wider, Stronger

Z-Profiles, with their optimum distribution of material, are the most efficient sheet piling sections available for bending strength. With the interlocks located on the outer fibers of the wall — rather than at the center line, as is the case with Arch or U-Profile sheet piling sections – the wall designer is assured of the published section modulus. The PZC™ Z-Profile is the optimal section for weight and strength, coupled with driveability.

PZC™ profiles are named for their strength in metric designations. For example, PZC 18 has a Section Modulus of 1,800 cm3/meter. PZC™ profiles should always be the designer’s first choice in order to provide the end user a highly efficient ratio of section modulus to weight.

(This article comes from Gerdau editor released)

Vinyl sheet piling installation

Technical specifications of usage

The use of plastic sheet piling by construction companies must be always conducted on the basis of the documentation,
provided by the manufacturer, which has been developed in accordance with current regulations, norms and approved
according to official procedures. All flood or retaining wall systems based on the offered solution should be constructed in
compliance with Pietrucha’s recommendations as well as professional designer’s guidelines to achieve maximum
durability, reliability and safety.

Installation requirements

The works require the use of special tools and equipment and must be conducted by qualified personnel of companies
specializing in civil and water engineering and construction. The installation of PVC sheet piles must also comply with the
project as well as fitting manual prepared by the manufacturer. Pietrucha is not responsible for any defects, which might
result from incorrect application and/or installation.

(This article comes from vinylpiling.eu editor released)

Double-wall Sheet Piling Cofferdam

These dam consists of two straight, parallel vertical walls of sheet piling, tied to each other and the space between walls filled with soil. The width between the parallel piles is empirically set as (h/2 + 1.5m); where h is height of water. Double-wall sheet piling coffer dams higher than 2.5m should be strutted. Sometimes, an inside berm is provided to keep the phreatic line within the berm.

The fill material should have a high coefficient of friction and unit weight so that it performs as a massive body to give the coffer dam stability against sliding and overturning. Suitable measures should be adopted to reduce the uplift on the coffer dam. This is generally done by driving the sheet piling on the upstream as deep as possible.

The double-wall sheet piling cofferdam has the advantage of having less leakage than that in a single-wall cofferdam. These coffer dams are suitable upto a height of 10m.

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(This article comes from CivilEblog editor released)

Types of Sheet Piling and Project Considerations

Sheet Piles are by definition, structural units which when connected one to another, will form a continuous wall, generally for retaining earth or excluding water. Individual pieces or pre-interlocked pairs, are installed by driving them into the earth using impact hammers, vibrators or by water jetting. In functioning as a wall, the sheet piling acts as a beam under load and therefore requires the capability to resist bending. In certain applications, ability to resist bending is not important but strength of interlock is. Sheet Piling is manufactured in three basic configurations “Z”, “U”, and “Straight”. They can be formed either “Hot Rolled” or “Cold Rolled”. A recent development to the industry is the production of some sheet piling shapes by the cold-forming process in which hot rolled sheet is fabricated into traditional sheet piling shapes. These new additions to product availability contain interlocks which are considerably different from the hot-rolled product. Manufactured from a hot-rolled coil of sheet, it is slowly fed through a series of rollers which gradually bends or forms the steel into its designated shape.

The “Z” type configuration for sheet piling is the strongest and most efficient. These shapes resemble wide-flange beams, having a web and two flanges. Since the interlocks are located out on the flanges at maximum distance from the neutral axis, a higher section modulus for resisting bending moments is provided. Z- shapes have traditionally been used for deeper walls and heavier construction projects. However, they are now supplanting the arch or “U” shape for lighter work as more light-weight Z-shape have been introduced into the marketplace. U-shapes resemble the hot-rolled channel sections produced on structural mills. The interlocks are formed on the web ends and interlock with their opposing mate along the centerline of the wall.

(This article comes from Roll Form Group editor released)

Philippines sheet piling

Philippines sheet piling MMU20-4 and MMU20-5 are easy to install in MMU20-6 difficult or restrictive MMU21-1 conditions, have a lower initial cost and reduce maintenance expenses. The location of the zone of maximum horizontal soil stress for wall systems with inextensible and extensible soil reinforcement, which forms the boundary between the active and resistant zones and which is assumed to be the failure surface for internal stability. Hardware shall be drop forged, pressed or formed steel, or made of materials MMU20-4 equivalent in strength. They also have greater strength and stability, are installed without expensive equipment and can be rapidly assembled with unskilled crews. For all wall systems, the zone of maximum horizontal soil stress shall be assumed to MMU 25-3 begin at the back of the facing elements at the toe of the wall.

Regan Industrial Sales, Inc. (RISI) shall be MMU20-5 smooth to prevent damage to the attached body harness or lanyard. CONTECH Bin-Walls gain stability from the weight of the fill material plus the weight of the steel structure MMU 25-2 itself. For wall systems with extensible soil reinforcement, the zone of maximum horizontal soil stress, as defined by the MMU20-6 angle,y , from horizontal, should be determined using the Coulomb theory.

When vertical lifelines (droplines) are used, not more than one employee shall be attached to any one lifeline. But unlike most other MMU 25-1 types of walls, they are flexible and adjust themselves to minor ground movement without cracking.. Hardware shall have a corrosion resistant finish. Closed construction All four sides of each CONTECH Bin-Wall cell are composed of overlapping MMU21-1 steel members. In applying the Coulomb theory, the back of the wall facing elements shall be assumed to be the pressure MMU 23-2 surface and, d , the wall friction angle shall be assumed equal to, b , or ,B, where,b , Philippine equals the slope of the backfill surface behind the wall face and, B, is the notional slope of the MMU21-2 backfill associated with a broken back backfill surface behind the wall face.

Sheet piles MMU21-2 in the following MMU22-1 items are based on a MMU23-1 and MMU23-2 total combined MMU 23-1 weight of employee and tools of no more than 310 pounds. Bolted together, they form an integral structure. Lanyards shall have a minimum tensile strength of 5,000 pounds (22.2 kN). The minimum effective pullout length shall be 3 feet. Because the face of a CONTECH Bin-Wall is fully MMU 22-2 enclosed, you are protected against loss of fill material. Horizontal lifelines shall have a tensile strength capable of supporting a fall impact load of at least 5,000 pounds (22.2 kN) per employee using the lifeline, applied anywhere along the lifeline. This contrasts with crib-type retaining MMU 22-1 wall construction through which fill material can escape, weakening the structure. Internal stability shall be used in the determination of pullout resistance.

Vertical lifelines (drop lines) shall have a minimum tensile strength of 5,000 pounds (22.2 kN), except that self-retracting lifelines and lanyards that automatically limit free fall distance to two feet (.61 m) or less shall have a minimum tensile strength of 3,000 pounds (13.3 kN). Concentrated surcharge loads shall be considered in the determination of the location of the zone of maximum horizontal MMU22-1 soil stress. Versatility CONTECH Bin-Walls can be readily adapted for mmu 21-1 installation on curves by shortening the horizontal stringers as needed to shorten either the front or rear wall face. Full body harness systems shall be secured to anchorages MMU23-1 capable of supporting 5,000 pounds per employee; except when self-retracting lifelines or other deceleration devices are MMU23-2 used which limit free fall to two feet, anchorages shall be capable of withstanding 3,000 pounds.

The rugged modular look and strong horizontal lines of CONTECH Bin-Walls blend well with most MMU25-1 environments. If combined weight is more than 310 pounds, appropriate allowances must be made or the MMU 20-6 system will not be deemed to be in compliance. The standard galvanized surface weathers gradually to a softer gray.All components of body harness systems whose strength is not MMU25-2 otherwise specified in this subsection shall be capable of supporting a minimum fall impact load of 5,000 pounds (22.2 kN) applied at the lanyard point of connection.

Regan Industrial Sales, Inc. (RISI) shall provide a minimum MMU25-1 or MMU25-2 factor of safety against MMU25-3 Philippine pullout equal to 1.5 as determined by the MMU 20-5 following equation. Snap hooks shall not be connected to loops made in webbing type lanyards. Snap hooks shall not be connected to the webbing of the lanyard unless designed to do so. In the determination of the vertical soil MMU25-3 stress at each level of soil reinforcement, only permanent loads should be considered. Not more than one snap hook shall be connected to any D-ring. Lanyards shall not MMU 20-4 be attached directly to a retractable device. x. System components shall be compatible.

Wooden sheet piles

Wooden sheet piles are made in various sizes and forms. The nature of site conditions determine, the choice of a particular type, In places where excavation is small and the ground water problem is not serious, 5 cm x 30 cm to 10 cm x 30 cm wooden planks arranged in a simple row will serve the purpose. If the water-tightness is required to a great extent, lapped sheet piling is used. In this case, each pile is made up of two planks, either spiked or bolted to one another. Thus if only earthen banks of small height are to be supported, a single or double row of  planks properly erected will perform the function of sheet piling. If complete water tightness is desired or pressure of the retained material wakefield or tongue and grooved sheeting is generally used. To facilitate the driving of the piles, they are usually bevelled at foot. This not only assists in driving but also prevents bruising, if the piles encounter hard stratum.

(This article comes from theconstructioncivil.org editor released)

LZH develops laser for underwater cutting of steel

Speed, precision and safety improved by new process based on a disc laser for torch cutting.

Performing industrial or engineering tasks under water is especially personnel- and time-intensive. Laser Zentrum Hannover (LZH) is therefore working on developing a laser-based, automated process for cutting sheet piling under water, in conjunction with the Institute of Materials Science of the Leibniz Universität Hannover.

Sheet piling typically protects fortified shore areas, or it can also be deployed to dry out these areas if repairs are necessary. If the sheet piling needs to be dismantled, divers have to cut the walls into smaller pieces using a cutting torch. Normally, a diver can cut about 20 meters a day, which corresponds to a speed of about 0.07 meters per minute.

In the project LuWaPro, scientists at the LZH have now developed a process which uses a disc laser for torch cutting. The divers thus only carries out a supervisory role. The process can be used to separate the metal sheets, which are usually 10 mm thick for sheet piling, at speeds of up to 0.9 m/min.

20170522Laser cutting of sheet piling under water.

Robust process

Poor visibility, currents or uneven surfaces make working underwater more difficult and dangerous for the divers. The scientists of the Underwater Technology Group have achieved a position tolerance of about two millimeters in their process, enabling the system to react robustly to possible impacts during underwater operation.

The process whas been tested with two scenarios: on the one hand, standalone metal sheets were cut underwater, on the other hand, the sheets were backfilled with concrete. In the second scenario, a leaking of the molten material through the cutting kerf is achieved by tilting the laser head at an angle of 20 degrees.

LZH comments that a further major advantage of the new process in comparison to the conventional hand-guided process is the possibility of closely monitoring the process. Sensors can reliably determine whether a cut is completed or not. Otherwise the diver often cannot see this due to the poor visibility underwater.

The laser safety necessary for this process can be assured if the diver wears conventional safety goggles under the safety helmet. The project, entitled “Laser cutting under water for high productivity – LuWaPro” has been supported by Germany’s Federal Ministry for Economic Affairs and Energy.

(This article comes from optics.org editor released)