h. Retained side: A generic term referring to the Some of the more Jetting at the toe of the pile with air or water can assist with advancing further. In Hong Kong, a general rule of thumb is this: If the sheet pile is less than 15mm thick and design strength of less than or equal to 355N/mm², then soil with stiffness greater than or equal to 50kPa is likely to cause driving complications. The common factor throughout is that missing sheet pile connections must account for the local reduced strength of sheet pile wall and gap in hydraulic barrier leading to greater groundwater draw-down. If it takes longer to install the sheet piles than planned, this will help to reduce the chance of a safety breach, personal Injury or damage to the piles. From experience, there is a contrast in opinion between engineers as to what is truly necessary. http://www.mill-pro.com.hk/products/sheet-piles/, http://www.ce-ref.com/Foundation/Sheet_pile/Sheet-pile_wall.html. well as excavator mounted vibratory pile driver/extractors. or templates should be used. If an obstruction is found, keep driving the successive piles until past the obstruction. Sheet piling is used as excavation support and for soil retention. contractor now has numerous choices when it comes to the installation of ( Log Out /  first two sheets and drive carefully and accurately, Drive sheets in pairs Hi, Does anyone know of an indicative rule of thumb for the length of a steel sheet pile vs retaining wall height. composite sheet piling obviously the aforementioned does not apply. Design consideration of pipe pile walls include: The type of sheet pile will have varying deflection and designed strength performances. situations whereby a vibratory hammer can cause the interlocks to literally 2.5M wall 5m pile. If only one sheet pile is connected to the lagging plate, then it may cause torsion of said sheet pile which can cause adjacent piles to experience unaccounted tension on the interlocking fold. Interlocking of the sheet piles is a must for installation and the depth of piling required along with the stiffness of soil must be considered to ensure the final product. When a hard driving condition is encountered, there have been 3 Check the condition of the sheet piles. Results: The program shows that the minimum embedment is 16.8’ and the pile length is 28.8’. These However, when using pile driving equipment in an excavated pit, Subpart O limits the employer's options to sloping or sheet-piling and bracing the walls. A hairpin sisting of sheet piling in the embedded depth and a monolithic concrete wall in the exposed height. granular, a vibratory hammer can drive steel sheet piling far faster than Especially for challenging jobs, drive a ‘test pile’ to simulate the piles can be driven to the target depth with the selected Vibro Head. ( Log Out /  a simple drop hammer. The maximum moment in the pile is 38.9 Kip-ft/ft at 20’ from the ground surface. piling should be threaded and set prior to driving any sheets to grade, Align and plumb the This general rule of thumb is not a certainty, but rather advice from sheet pile driving experiences. The Excessive hammer size in relation to the pile weight and gauge will significantly increase the risk of pile damage. Work only with undamaged sheets. This will keep it clean for threading of the next pile to be driven. The weight of the pile vs the hammer weight – a good rule of thumb is that the hammer is 50% heavier than the pile to be driven. Do not overdrive/force piles in hard conditions as damage can occur. Drive the first two sheets carefully, checking for vertical, longitudinal and lateral alignment. Sheet Piling is used to provide temporary and permanent walls in the construction industry. Change ), Create List of Files in Folder Using Excel VBA, Safety Management in the Construction Industry. Refer to our Panel Driving Method web page for guidelines using a Template and Waler system. Thumb and Finger Interlock is Used on Flat Sheet Piles. numerous “smaller” compact, free hanging vibros from various manufacturers a ( Log Out /  might be best to reconsider the use of a vibratory hammer as an impact hammer effective hammers utilized for these installations are small air hammers as When a pile is clutched, avoid dropping the pile as it can bend and cause damage. Concrete or Aluminum. MCMag With methods and equipment are approved. Gaps in sheet pile wall will require lagging plates which must account for the relative connections to adjacent sheet piles. To Apart from thickness of various sheet pile types, the grade of steel is important for the driving process. with the ability to grab Sheet Piling from not only the Top of the Sheet but Sheet piles come in various cross-sectional shapes, but the common factor for all is the fact that individuals sheets must be driven to connect adjacent sheet piles. Sheet pilings properly When walls are being As individual piles are relatively weak and need to overcome skin friction, stiffer soils requiring greater energy during the driving process can deflect driving alignment or complete halt the sheet pile driving. used to obtain the proper plumbness of the sheet pile wall. I've heard double the retaining wall height i.e. Suppose, the concrete quantity is 0.5m 3 then the shuttering area required is … of obstructions which could cause failure or weakening of the sheet pile during can be used to assist penetration at this point. Sheet piling should Authors: ... are the part of a structure used to carry and transfer the load of the structure to the bearing ground located at some depth below ground surface. Should this be encountered, consideration should be given to a larger hammer or jetting as mentioned above. A good Template system will aid in keeping sheet piles plumb. ensure that piles are placed and driven to the correct alignment, a guide structure the “male” interlock leading in order to avoid annoying soil plugs, If the “female” Interlock is rated by ... Reading Sheet Pile Dimensions: Wall Depth Distance between outboard and inboard Faces . Make sure the boom of the crane is ‘luffed’ correctly, directly over the top of the line of the piles to avoid bending the pile you are driving. Figure 1: Various types of sheet pile as seen from USS Steel Sheet Piling Design Manual. Contract specifications at Excavation depth, soil layers, sheet pile, soldier pile, frame positions, etc are defined by double-clicking the item and changing the relevant parameters. Book • 2008. be used in driving each pile or pair of sheet piles. when possible placing the hammer in the center of the pair, Some contractors The placed and driven generally are interlocked throughout their length. One of the most common excavation and lateral support (ELS) structures is the sheet pile wall in which individuals piles are interlocked to form a hydraulic barrier. Use a Sheet Pile Threader where piles are being clutched in the air. Templates should also be If this occurs, remedy it immediately, even if it takes some time to fix by partially extracting some sheets. It will save damage and time to fix it later. Don’t release all the hammer weight when driving, but rather let the hammer cut/work its way through the ground at a steady pace (faster is not always better). most common methods of installing steel sheet pile walls include vibrating, embedment depth is unknown, the value can be set “999” to let the program find embedment. Nov 26 2019 Selection of the Vibro Head should be based around a number of factors, namely crane size, radius, and line pull. If the ground is too hard to drive piles, the job may require shorter piles or pre-drilling of the harder ground prior to starting. This type of ELS installation requires relatively less work, but the designer must account for the individually weak piles. Trimming 25mm off the top of the clutches will assist in clutching the next sheet and sheets in windy conditions. twice that of the sheets one is driving, Drive the Sheets with constructed, sheet piling should be checked periodically (at a minimum, every 5. Thumb rule to calculate the shuttering required is 6 times the quantity of concrete or 2.4 times of Plinth area. can easily extract piling when necessary. times may prohibit the installation of sheet piling until the contractor’s The soil displacement of sheet pile driving is also relatively small with ground settlement immediately adjacent to sheet pile generally not exceeding 5mm. The following 3 thumb rules can be used to know the significant depth. Check soil conditions from soil test logs to determine how hard or soft the soil is expected to be. When installing lighter weight aluminum, vinyl sheet piling or The become a far less cumbersome act. recommend not driving a sheet more than 1/3 its length before driving the Lagging plate design for sheet pile walls will generally assume transferring soil and groundwater pressures to multiple adjacent sheet piles. It creates a border which keeps the soil back, away from the structure. It can be that depth where net increase in vertical pressure becomes less than 10% of the initial overburden pressure. Always use the appropriate lifting eyes and pick-up points when handling piles. In general, sheet piles are a cost effective construction method for excavation as the unit cost is low and the sheet piles can be recovered after back-filling. This general rule of thumb is not a certainty, but rather advice from sheet pile driving experiences. ( Log Out /  The weight of the pile vs the hammer weight – a good rule of thumb is that the hammer is 50% heavier than the pile to be driven. types of pile driving hammers used for the installation of steel sheet piles The transverse tension from lagging plates may cause a reduction in longitudinal friction and compromise the designed strength and deflection behavior. adjacent pile, Letting the sheets driving. Many contractors recommend at least two templates “free-fall” and drop in order to aid in penetration will generally cause The connecting clutch on the pile being installed should be kept wet with water while the clutch is sliding during installation to avoid overheating the clutches, resulting in clutches ‘welding’ together and causing damage. SUGGESTED MARINA WALKWAY & HANDRAIL REQUIREMENTS, Minimum Design Criteria for Fixed and Floating Structures, Mooring Operations and Port Facility Safety, Floating Breakwaters, Docks and Marina Systems, Rule of thumb: When Create a free website or blog at WordPress.com. g. Dredge side: A generic term referring to the side of a retaining wall with the lower soil surface elevation or to the side of a floodwall with the lower water elevation. 3876 Views. All Rights Reserved. the sheets to fall “out of plumb”. Lifting and lowering the pile multiple times as the penetration becomes slower usually helps. Point-and-click editing of designs and user-friendly data entry. the innovations of Hydraulic Excavator Mounted Vibratory Pile Driver/Extractors (See Chapter 5). filling the female end, A panel of sheet The relationship between grade of steel and sheet pile thickness are variables to balance the relative stiffness of soil. Inspect the piles for excessive ‘camber’ or ‘sweep’. Excessive hammer size in relation to the pile weight and gauge will significantly increase the risk of pile damage. interlock must lead, place a bolt or other object at the bottom to avoid debris

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