DRILLED SHAFT INSPECTOR’S GUIDELINES - New York State ...

DRILLED SHAFT INSPECTOR'S GUIDELINES

GEOTECHNICAL ENGINEERING MANUAL GEM-18

Revision #2

AUGUST 2015

GEOTECHNICAL ENGINEERING MANUAL: DRILLED SHAFT INSPECTOR'S GUIDELINES

GEM-18 Revision #2

STATE OF NEW YORK DEPARTMENT OF TRANSPORTATION GEOTECHNICAL ENGINEERING BUREAU

EB 15-025

AUGUST 2015

Page 1 of 30

TABLE OF CONTENTS

1. INTRODUCTION................................................................................................................3 1.1 Purpose.....................................................................................................................3 1.2 Role and Responsibilities of the Inspector...............................................................3 1.3 Definition of Terms..................................................................................................4

2. CONTRACT REQUIREMENTS ........................................................................................6 2.1 Specifications ...........................................................................................................6 2.2 Plans .........................................................................................................................6

3. PRECONSTRUCTION MEETING ....................................................................................7

4. DRILLING ...........................................................................................................................9

5. CONCRETING ..................................................................................................................10

6. INTEGRITY TESTING .....................................................................................................12

7. CONSTRUCTION MONITORING ..................................................................................15 7.1 Monitoring Aids.....................................................................................................15 7.2 Guidelines for Filling Out Drilled Shaft Monitoring Forms ..................................20 7.2.1 Drilled Shaft In Rock - Field Record Page 1 .............................................20 7.2.2 Drilled Shaft In Soil - Field Record Page 1 ...............................................25 7.2.3 Drilled Shaft In Rock or Soil - Field Record Page 2..................................25

REFERENCES ..............................................................................................................................29

APPENDIX ....................................................................................................................................30

A Drilled Shaft In Rock - Field Record Page 1 ...................................................... A-1 B Drilled Shaft In Soil - Field Record Page 1 .........................................................B-1 C Drilled Shaft In Rock or Soil - Field Record Page 2............................................C-1

EB 15-025

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1. INTRODUCTION

1.1 Purpose

These guidelines along with the Drilled Shaft Inspector's Manual, prepared by ADSC: The International Association of Foundation Drilling and DFI: Deep Foundation Institute, provides the inspector or Engineer-In-Charge (EIC) with a working knowledge of drilled shaft construction techniques. To become familiar with drilled shaft installation techniques, a working knowledge of the tools used by contractors is also essential. The Drilled Shaft Inspector's Manual will provide the individual with a working knowledge of drilled shaft installation equipment in addition to familiarity with actual construction techniques. Lastly, these guidelines will provide the individual with monitoring aids to facilitate the inspection procedures and enhance the transfer of information from the inspector to the designer. The monitoring aids consist of methods to obtain necessary field data as well as inspection forms on which to record this data.

There is no substitute for direct contact between the inspector and the geotechnical engineer who designed the drilled shaft foundation. Contact with the geotechnical engineer will give the inspector access to information he/she may not have possessed otherwise, as well as insight into why drilled shafts were utilized on this project. The geotechnical engineer will be responsible for reviewing the construction information recorded by the inspector, as well as, evaluating the foundation for acceptability. For this reason alone, it is prudent that the inspector/EIC and the geotechnical engineer have a good working relationship. At the very least, the geotechnical engineer should sit down with the inspector/EIC before construction begins and discuss any concerns either have.

1.2 Role and Responsibilities of the Inspector

The primary role of the inspector is to make sure that construction is done in accordance with the plans and specifications contained on the project. Thus it is imperative that the inspector is familiar with the plans and specifications of the project. Any deviation from the plans or specifications should be promptly noted and reported to the proper authorities, who will determine what actions to take.

The inspector's secondary function is to record and transmit information. The drilled shaft inspector is there to observe and document the contractor's installation of the drilled shaft. In this regard he/she should also try to be as complete and as concise as possible when recording and transmitting this information to the proper authorities. The quality of this information must be very high as it will be used to make important decisions such as the approval or rejection of the drilled shaft.

EB 15-025

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