This paper addresses topics on equipment, preparatory work, and construction sequence for driven PC piles. In-situ quality control procedures, construction check list, as well as remedial measures are also presented for reference.
Construction of reversed circulation pile (RCP) has the advantages of low noise, minimal vibration, and low cost. This construction method is also applicable to various ground conditions； therefore it is gainning wide popularity in urban construction sites, where enviromental factors are of concern. RCP can be used to support structures such as high rise buildings, highway and railroad bridges. Pin posts of internal bracing system and top down construction are often installed by RCP technique. This paper addresses the equipment, construction sequence, quality control, and other details of RCP. A check list and remedial measures for RCP construction are also provided for reference.
In this paper , the background and development of planted piles are reviewed and the bearing mechanisms and the use of various pile capacity estimation methods are discussed for different types of planted piles. The field construction quality control is studied and the comparisons with other types of piles in terms of cost and schedule are also made based on the practical cases of planted piles in Taiwan.
Since 1988, the bored holes of cast-in-place piles in Taiwan are mainly stabilized by temporary casing instead of the traditional slurry method. The idea of construction, equipment, application, problems and the ways to solve them, specification and quality control, and the prospects of the construction method were discussed in this paper. It is eagerly anticipated that the method be known more by the engineer and it's application can be extended more.
Because of the recent development of electronic technology and computer industry, the nondestructive testing equipment of pile is well-developed. Pile integrity testing(PIT) becomes an essential part of quality control of construction for many civil engineering projects. The developed equipment for nondestructive testing of pile is described in this paper. The main purpose of this paper is to review the recent development method of pile integrity testing and to discuss the testing cases. The method's strengthes and weaknesses are outlined as an aid to select the most appropriate technique for a given set of circumstances.
The main purpose of this paper is focused on the study of the integrity of pile foundations using nondestructive technique of high strain dynamic testing. This method is based on the mechanical impedance of wave theory and is associated with the implementation of electrical equipment. In order to secure the safety of structures, the quality control of pile foundations should be done by nondestructive technique such as high-strain dynamic testing. Generally speaking, this method is a reliable, rigorous, fast, qualitative, economic and valid nondestructive testing for pile foundations.
The correctness of pile capacity comes from accurate and reliable load testing methods. This paper addresses the method of pile load test by means of dead weight, The associated instrumentation for data acquisition, and highlights some practical problems. Secondly, the concepts of Pile Driving Analysis (PDA) and Dynamic Load Test (DLT) are presented in details. Local case records on pile load tests are used to demonstrate that PDA and DLT can be applied to improve the driving efficiency and to check the quality of driven piles. Finally, the latest pile load test by statnamic method is introduced. Some actual pile test results are cited for reference. With the application of these testing methods, better quality of pile load test may be achieved at lower cost.The correctness of pile capacity comes from accurate and reliable load testing methods. This paper addresses the method of pile load test by means of dead weight, The associated instrumentation for data acquisition, and highlights some practical problems. Secondly, the concepts of Pile Driving Analysis (PDA) and Dynamic Load Test (DLT) are presented in details. Local case records on pile load tests are used to demonstrate that PDA and DLT can be applied to improve the driving efficiency and to check the quality of driven piles. Finally, the latest pile load test by statnamic method is introduced. Some actual pile test results are cited for reference. With the application of these testing methods, better quality of pile load test may be achieved at lower cost.
If used properly, in situ testing can be a very economical and efficient way of obtaining geotechnical engineering parameters. For cohesionless soils, in situ test is essentially a must. Certain loading conditions experienced by a pile can be duplicated by some of the in situ test methods either by insertion/installation of the test tool or during the stage of testing. These capabilities make in situ testing even more desirable. This paper describes, from practical point of view, static analysis of pile foundations using in situ test results. Piles can be subjected to a variety of loading conditions and there are many in situ testing methods. The paper concentrates on piles under axial and lateral loading conditions. In situ testing methods presented in the paper are limited to cone penetration, standard penetration, pressuremeter and Marchetti dilatometer tests. For each of these four methods, a selection of available and feasible theories on related subjects are described. The aim is to provide sufficient information for the reader to make an evaluation of these methods. Detailed information can be obtained from the references.
This paper presents a semi-analytical approach for the evaluation of the groundwater inflow and drawdown in tunneling. Using the image method and the superposition principle, the problem in a finite domain is transformed to a problem in an infinite domain. Using the convolution-deconvolution method, the problem of time-variant inflow is transformed to a problem of constant inflow. Several calculation formulas corresponding to some current hydrogeological configurations are developed and discussed in this paper. The comparison of the calculated inflow to the observed one shows that this approach can give quite reliable results, with relatively simple computation compared to the numerical methods.