The keyways shall be continuous robust and so formed over the total length of the tubing to allow the inclinometer to be successfully deployed. For concrete piles or wall elements any laitance or contaminated, cracked or defective concrete shall be removed, and the pile made good in a manner to provide a full and sound section up to cut-off level. Kentledge: dead load used in a loading test. The bearing pressure under supporting cribs shall be such as to ensure stability of the kentledge stack. In the case of failure of one or both of these additional tests, the length of pile covered by the tests shall be rejected.
When base driving the concrete plug shall have compacted height of not less than 2. Resistance: the force developed by a pile in response to a load. Commencing surface: is the level at which the piling tool or pile first enters the ground. Certificates of treatment must be obtained and presented to the Engineer for all treated timber. Information is given on the tendering process, design and on issues such as safety, quality and the environment. All records shall be in accordance with Clause B1. The method and sequence of lifting, handling, transporting and storing piles shall be such as to avoid shock loading and to ensure that piles are not damaged.
Temporary casings shall be extracted while the concrete within them remains sufficiently workable to ensure that the concrete is not lifted. Measures shall be taken to ensure that the structural strength of the concrete placed in the piles is not impaired through grout loss, segregation or bleeding. In addition, the Tenderer shall submit the following details with his tender: 1. Details of the action that would be taken to stabilise an excavation if for any reason the completion to the excavation of the concreting is delayed or prevented. Cutting and boring of timber shall be done as far as possible before preservative treatment, but, where this is not possible, all surfaces subsequently cut or bored shall be heavily coated with preservative as specified in the relevant British Standard for preservative treatment or in accordance with the manufacturer's instructions as appropriate. Prior to the commencement of concreting and the removal of augers from the ground, the hollow auger delivery pipe and tubing shall be pre-charged with concrete. Where casings are used which leave an annulus around their perimeter, the time period shall start when the leading edge of the casing passes into a stratum which contributes to the load-carrying capacity of the pile.
Where a support fluid is used for maintaining the stability of a bore, a temporary casing shall be used in conjunction with the support fluid so as to ensure stability of the strata near ground level until concrete has been placed. In this section the term panel shall refer to both walls and barrettes. The minimum depth of guide wall shall be 0. The Contractor shall ensure that axial loading is maintained at all times during the test. Each piece of timber shall be clear of the ground and have an air space around it.
All procedures shall be in accordance with Clause B3. The preparation of surfaces and the application of the coats to form the coating shall be carried out safely by competent personnel. Thomas Telford, London, 2007 Testing shall be carried out at least three days after the weld to be tested has been completed. The contractor shall take all precautions in the mix design and placing of the concrete to avoid arching of the concrete in the casing. The factor of safety relates only to the failure of the pile-soil interface.
Tests shall be undertaken in accordance with the relevant Standards and the Project Specification. Jetting shall not be permitted where there is a risk of causing damage. Sampling depth shall be at least 200 mm, and the sampler shall not compress the top of the sample. Lawrence Specialist contributors to individual chapters , Arup; B. Part B is the specification and is the only part of this document intended for incorporation in contracts.
Temporary tension piles and ground anchorages shall be cut off below ground level, and off-cut materials removed. Related Work Specification for piling and embedded retaining walls. All operations such as handling, transporting and pitching of piles shall be carried out in a manner such that no significant damage occurs to piles and their coatings. The Contractor shall measure and record the pile depth after every penetration of the underreaming tool in order to confirm that the final use of the tool is the deepest cut of the base. Piles shall be placed on supports that are of sufficient size and frequency to prevent distortion.
For a pile that is tested in compression, the pile head or cap shall be formed to give a smooth plane surface which is normal to the axis of the pile, sufficiently large to accommodate the loading and settlement measuring equipment, and adequately reinforced or protected to prevent damage from the concentrated application of load from the loading equipment. Specification for piling and embedded retaining walls. Part A is an introduction to the essential concepts necessary to procure a piling or retaining wall contract. Reinforcement shall be placed and maintained in position to provide the specified projection of reinforcement above the final cut-off level. Close control of the mixing of the grout shall be carried out. The number of piles and sizes of pile caps shown are indicative and have been produced prior to receipt of ground investigation data. In cases where reaction piles are not used and where ground anchorages are used to provide a test reaction for loading in compression, no section of fixed anchor length transferring load to the ground shall significantly interact with the test pile, and the centre-to-centre 815.
Access restricted to subscribing institutions. As excavation proceeds horizontal units, which could be made from timber, pre-cast concrete or steel, are inserted between the H-section flanges to support the soil. Thomas Telford, London, 2007 matter. Any cracked or defective concrete shall be cut away and repaired in a manner to provide a full and sound section at cut-off level. A vertical tolerance of +150j-50mm i. Any repairs shall be carried out to a procedure approved by the Engineer and re-testing undertaken as appropriate.