ICE Specification for piling and embedded retaining walls, 2nd edition. Authors: The Federation of and Preliminary Pages · First Page Preview | PDF ( KB). The ICE Specification for Piling and Embedded Retaining Walls (SPERWall) is the UK's pre-eminent technical specification for piling and embedded walling. Adapted from 'Specification for piling and embedded medical-site.info June retaining walls, Thomas Telford, London, be no direct obligations included .
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presentation slides online. ICE Specification for Piling and Embedded Retaining Wall. Download as PDF or read online from Scribd. Flag for inappropriate. ICE Specification for Piling and Embedded Retaining Walls - Free download as PDF File .pdf), Text File .txt) or read online for free. ICE Specification for Piling. 5 days ago Embedded Retaining Walls [PDF] [EPUB] 3 Volume 1 Specification for Highway Works Series. Piling and Embedded Retaining Walls.
Larger diameter tubes may impede the flow of the concrete and should be used with caution. Rectangular perforations will almost certainly trap supporting fluid within the concrete, and should not be used. It is particularly important when excavating tee panels, corner panels and the like to ensure that the excavation is carried out as accurately as possible. It is also important that additional concrete cover should be allowed to the reinforcement in such panels to ensure that the cage will fit into the excavation after taking into account allowable tolerances.
Taking a 20 m deep tee panel, for example, the leg of the tee and the top of the tee could be mm from their true positions at the base of the excavation and still be within the specified tolerance.
One or both of them could also be twisted.
A reinforcement cage with only the minimum allowable cover would not fit into this excavation. Congested reinforcement and box-outs for recesses in diaphragm wall panels can lead to defective concrete.
The concrete must be able to flow easily around the bars and the box-outs, and rise uniformly over the entire area of the panel. Typical details are shown in Fig.
When deciding on the diameter and spacing of the vertical bars, it is important to remember that in the case of wall panels, the reinforce- ment will not extend to the ends of the panel, because space has to be allowed between adjacent cages for the panel joint see Fig.
The reinforcement should not extend into the shoulders of the panel joints since this will obstruct concrete flow at a particularly critical location. The final clear distance between the bars will there- fore be less than it would otherwise be if the bars could be spaced uniformly along the length of the wall.
The final clear horizontal distance between vertical bars in a single layer of reinforcement should be at least mm. This figure can be. Specification for piling and embedded retaining walls. Tremie position Tremie position.
Where two layers of reinforcement are required on a wall face, the bars in the inner layer should be aligned behind those in the outer layer in order to allow the concrete to flow easily between them. Otherwise the minimum clear distance should be mm.
Links are used between the front and rear faces of a reinforcement cage to hold the bars in their correct positions and to provide shear resistance. The clear horizontal distance between the legs of links should be at least mm, with at least mm at tremie pipe positions see Fig.
The same clear distances are required between transverse bars at connec- tions between floor slabs and the diaphragm wall. Joints in steel reinforcement can be made either by lapping the bars or by using couplers. Cages should be made in one length where possible in order to minimize the delay between completion of panel excavation and commencement of concreting.
If a cage is too long to be lifted in one piece, it must be made in two or more pieces which are then joined together as they are lowered into the panel excavation. Joining the sections of cage together over the excavation will be facilitated if the cage is fabricated in one piece on the ground then split into sections before being lifted. This is of particular advantage when couplers are used. Diagonal bracing bars are normally provided in each section of cage to ensure that it will not distort when being lifted.
Specially designed lifting bars are provided at the top of each section, to which lifting shackles can be attached, and specially designed hanging bars are provided at the top of the upper section to enable the cage to be suspended at the correct level in the excavation.
If there is insufficient space available on site to fabricate the cages, it may be possible to make them at a separate location and transport them to site by road.
In these circumstances the width of the cages has to be restricted to the maximum that can be transported, therefore two or three separate cages may be required in each panel.
Multiple cages may also be necessary in the case of panels founded on hard rock where a varying founding level is required. The minimum clear distance between adjacent cages in the same panel should be mm. It is important to ensure that all this material is lifted up above the cut-off level and that all the concrete below the cut-off level is sound.
In order to achieve this, the concrete should be brought up to I m above the cut-off level. Where the cut-off level is less than 1 m below the top of the guide walls, it will be necessary to flush some of the contaminated concrete over the top of the guide walls to ensure that the concrete below the cut-off level is sound.
Standard panel wid ths are , SOO, , and mm. Panel lengths depend on several factors including the dimensions of the excavation tool, the type of stop-end equipment if required , the excavation sequence, the ability of the support fluid to maintain trench stability and the proximity of adjacent structures.
The volume of concrete required to fill the panel and the weight of the reinforcement cage are also important considerations. Thomas Telford, London, Flag for inappropriate content. The new ICE Specification for Piling and Embedded Retaining Walls is designed to be used as the new technical specification for piling and embedded walling works either on land or near to shore. It documents the latest piling techniques and procurement methods used in the foundations sector whilst incorporating the changes introduced by the new European Standards.
Back to Book Listing. View Chapters. Select All. For selected items: Table of Contents. Contents and Preliminary Pages. General requirements. Specification requirements for piling and embedded retaining walls.