Piling Foundations

Seismic zone basis must be specified for structural design. Soil data is important, especially for cases where extensive use of foundation piling is required with major cost impact. Availability of aggregate or natural pond stabilization materials near the site will not be considered for early cost estimates, but can be kept in mind for future planning if the project is given the green light. 

Round-welded or seamless pipe for use as foundation piles where pipe cylinder acts as a permanent load-carrying member usually filled with concrete. Used below the ground in foundation work in the construction industry for piers, docks, highways, bridges and all types of buildings. Fabricated to ASTM piling specifications (ASTM A-252). 

Abstract. Energy Pile System uses building foundation piles as ground heat exchangers. For the new building at Sapporo City University steel foundation pile is decided to be used with the HVAC system. The construction work started in January 2005. Total of 51 steel pipes have been screwed. The paper gives the results from performance analysis and construction phases of the project. 

Use of Building Foundation Piles as Ground Heat Exchangers, Energy Pile System ... 

The advantages of the steel foundation pile to be the ground heat exchanger are its high water-tightness and low thermal resistance due to high thermal... 

PLANNING OF ENERGY PILE SYSTEM USING BUILDING STEEL FOUNDATION PILES... 

The layout of building foundation piles always depends on the building structure, geological condition and the type of foundation piles. It is not in regular lattice pattern in most cases. Many existing designing soft wares utilize so-called G-function and they cannot support the irregular layout. The author s... 

Figure 93. Layout of installed steel foundation piles and piping (51 piles with 600 800 mm

The minimum brine outlet temperature is —0.8 °C during the fifth year s operation. During summer the outside air for the ventilation is cooled by the circulated brine between ventilation units and U-tubes in foundation piles and then removed heat is released into the ground. Finally it is realized that brine temperature after the summer season completely recovered to the initial temperature at the start of the fifth year s operation. This means that sustainable operation can be kept in this Energy Pile System. 

Table 16 describes the predicted performance of the GSHP system. Total amount of extracted heat from the ground reaches 180 GJ and electricity consumption is 13.9 MWh. In this time COP ofthe heat pump unit is 4.4. When this system will adopt a constant—speed pump which can cover the maximum heat output, SCOP is 2.7. This result suggests that a variable speed pump according to the heat loads is effective to improve SCOP. On the other hand, released heat into the ground during summer is 56 GJ and the electricity of 3.6 MWh is consumed to circulate the brine between U-tubes in the foundation piles and ventilation units. SCOP during summer is estimated to be 5.7. This can be also improved. 

Figure 98. Layout of installed 51 steel foundation piles and inserting of two sets of U-tubes...

Equipment foundation, pile caps, grade beams 12 630... 

Civil works such as roads, foundations, piling, buildings, sewers, ditches, embankments, etc. ... 

Bacteria and soft rot fungi are more tolerant of the low oxygen conditions in saturated wood, and in wood that is buried in sediments bacterial decay tends to predominate. Early reports identified unicellular bacteria in foundation piling and shipwreck timbers, but more recently three bacterial decay types in wood cell walls are now recognised - erosion, tunnelling and cavitation bacterial decay. 

Advanced bacterial attack has been observed in wooden foundation piles below the water table 101, 102, 113, 114). Waterlogged timber extracted at archaeological excavations in Uppsala, Sweden, was extensively degraded by erosion bacteria. 

Driven Pile Foundation, Pile Driving Systems and Formulas... 

Micropiles are smaller diameter piles mainly used in an underpinning operation when there are no other options to support buildings in use. A wide range of applications has also been documented which shows the versatihty of this technique. The piles can therefore function like an ordinary foundation pile as well as a compensation pile for remedial works especially in areas with site constraints. The design procedures for micropiles are no different than the conventional pile although various products have their own guidelines. 

Chin (2004) presents results of a static load test on a 825 mm diameter drilled shaft and assessed it with regard to the relevant settlement acceptance criteria of Table 11.1. The Malaysian PWD specification for piling works was adopted as the standard specification governing the testing and foundation pile performance. 

This may not be possible for structures where access to concrete surfaces is limited like bridges in operation (accessible from below only and not from the pavement), retaining walls, foundations, piles etc. In those cases accuracy in quantitative analysis results will decrease unless sensors are combined to an array. 

Transient foundation uplift or rocking involving separation from the subsoil of an end-bearing foundation pile group or the contact area of a foundation footing could be allowed under impact loading provided sufficient consideration is given to the structural stability of the substructure. 

Kulhawy, F. H. and K. K. Phoon. 1993. Drilled Shaft Side Resistance in Clay Soil or Rock, Design and Performance of Deep Foundations Piles and Piers in Soil to Soft Rock, Eds. P.P Nelson, T.D. Smith and E.C. Clukey, ASCE, Reston, VA. pp. 172-183. 

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