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Treatment of Drill Bits for Concrete Cast-in-Place Pile Driving Rigs

During the drilling construction of bored cast-in-place piles, drill bits and drill pipes may fall into the borehole due to different geological conditions, construction factors, and mechanical reasons. The fishing methods also vary depending on the different circumstances of the dropped drill bit accidents. Improper fishing methods will not only fail to retrieve the dropped drill bit, but also damage the already drilled pile hole, and are prone to safety accidents, possibly causing schedule delays and economic losses to the project. Through an engineering case, this paper introduces the treatment method for a dropped drill with part of the drill pipe attached, for the reference of peers.

2015-08-18
Risk Control for Square Pile Driving Operations Using Hydraulic Walking Pile Drivers

In recent years, some nearshore projects in northern China—such as retaining walls, cofferdams, and sheet-pile wharves—have adopted land-based pile drivers instead of pile-driving barges to drive prestressed concrete square piles. This construction method has been favored by many contractors for its low cost, high efficiency, and limited susceptibility to tidal restrictions. However, because this new construction technique mostly uses hydraulic walking pile drivers, whose hammer impact force is relatively weak, auger drilling is required to pre-bore holes, making driving difficult and high-risk. This paper identifies the hazard sources in the construction process of hydraulic walking pile drivers, conducts a qualitative analysis of the key risk factors, and proposes effective risk control measures.

2015-08-18
Brief Analysis of the Application of Pile Drivers in Pile-Driving and Drilling Construction for Expressway Crash Barriers

Expressway crash barriers, also known as corrugated beam guardrails or corrugated plates, are among the most important transportation infrastructure facilities and serve as vital maintenance and safety assurance installations for expressways. With the rapid development of expressways, safety issues have attracted increasing attention, and crash barriers, which play an important role in expressway safety, have drawn considerable interest. This paper briefly analyzes the application of pile drivers in pile-driving and drilling construction for expressway crash barriers.

2015-08-18
Research and Analysis of Vehicle-Mounted Pile Driver for Flood Control and Emergency Rescue

Pile driving is an indispensable task in flood control, emergency rescue, and levee construction. Existing pile driving machinery is mainly diesel and vibratory pile drivers, which are noisy, inefficient, and limited in function. Aiming at the harsh conditions of the Yellow River levee projects, which consist mainly of earth dams and where dangerous situations develop rapidly, this project designs a new type of vehicle-mounted pile driver for flood control and emergency rescue on the basis of absorbing the advantages of similar products at home and abroad. The machine consists of a hydraulic control system, a supporting slewing mechanism, a main arm, and a guide template. Using a general-purpose small four-wheeled vehicle as the carrier and the motor vehicle engine as the power source, the pile driving speed can reach 1-5 m/min, with a maximum pile depth of 1.5 m. The pile driver integrates pile standing, pile driving, pile release, and pile extraction into one unit, featuring a high degree of automation, safety and efficiency, mobility and flexibility, and convenience and practicality.

2015-08-18
Design and Manufacture of the Hydraulic Clamp for Vibratory Pile Drivers

This paper presents the design of the yoke beam in the hydraulic clamp of a vibratory pile driver, the selection principles and calculation process for T-bolts, and the design process for the clamping head and hydraulic system.

2015-08-18
Application of Land-Based Pile Drivers in the Reconstruction and Expansion of High-Pile Wharves

With the rapid development of China's water transport industry, high-quality wharf shorelines are becoming increasingly scarce. Upgrading and reconstructing existing wharves to improve wharf utilization and meet the demand for larger operating vessels has become a trend in wharf construction and development. Using land-based pile drivers to add piles along the rear edge of a wharf is a relatively reasonable and rapid reconstruction method for the expansion of high-pile wharves.

2015-08-18
Development and Experimental Study of a Portable Hydraulic Flood-Control Pile Driver

This paper presents the structure and functions of a portable hydraulic flood-control pile driver. The machine is mainly composed of a power unit, a hydraulic system, a main hammer body, and a frame. The hammer body weighs 42 kg, and the whole machine can rotate in all directions and move easily, enabling it to adapt to complex working environments. It is a pile-driving machine specially designed for flood-fighting and emergency rescue during flood seasons, as well as for levee reinforcement and maintenance before and after floods and for piling on the banks of rivers and lakes. It replaces the outdated method of manually driving wooden piles, reduces labor intensity, improves piling efficiency, and achieves mechanized pile driving for flood-control and emergency operations, showing good prospects for application and promotion.

2015-08-18
Application of Static Pile Driver at Liyang Station on the Nanjing-Hangzhou High-Speed Railway

For the DK97+872.2–DK98+225 pipe section at Liyang Station on the Nanjing-Hangzhou High-Speed Railway, the geological conditions consist of soft soil subgrade, and the design adopts pipe piles for foundation reinforcement, with a pile diameter of φ0.5 m, a pile spacing of 2.2–2.4 m, and a pile length of 25–30 m. Nearby is the "Sandwich Village" formed between the Nanjing-Hangzhou Expressway and the Nanjing-Hangzhou High-Speed Railway. Using conventional pile drivers with the driving method for construction would seriously affect the normal production and life of the villagers in "Sandwich Village" and would also cause buildings and other structures in "Sandwich Village" to lose stability due to excessive vibration. Therefore, special mechanical equipment and construction technology must be used for pipe pile construction within this pipe section to eliminate the impact of pipe pile construction on Sandwich Village and to proceed on schedule according to the Nanjing-Hangzhou High-Speed Railway construction schedule.

2015-08-18
Discussion on Design Issues and Optimization Measures for Hydraulic Systems of Static Pile Drivers

Based on the author's work practice, this paper focuses on analyzing the problems existing in the hydraulic systems of early hydraulic pile-sinking machines and proposes optimization design measures for such systems. Practice shows that after optimizing the design scheme of the hydraulic system of the static pile driver, its performance has been improved and the energy-saving effect is relatively obvious, which is worthy of reference and study.

2015-08-18
Analysis of the Relationship Between Pile-Driving Reaction Force of a Precast Static Pile Driver and the Bearing Capacity of a Single Precast Pile

Static pressing construction is a pile-sinking process in which the pile-pressing mechanism of a static pile driver uses the self-weight of the pile driver and the counterweight on the frame to provide reaction force and press the pile into the soil. This method has the advantages of no noise, no vibration, a small construction site, low cost, and the ability to achieve quantitative monitoring; at the same time, no dynamic stress occurs in the pile body during pile sinking, which can reduce reinforcement. Among these, the ability to directly display bearing capacity is the greatest advantage of this process. At present, this construction technology has attracted great attention from the engineering community, and its scope of application in engineering practice is becoming increasingly widespread. This paper mainly analyzes the relationship between the pressing reaction force of a static pile driver and the bearing capacity of a single precast pile.

2015-08-18
A Brief Analysis of the Design of the Mast for Fully Hydraulic Pile Drivers

Drawing on the chassis and slewing systems of small excavators as applied to pile drivers, this paper presents a preliminary design of a mast system suited to the functional requirements of a fully hydraulic pile driver, with the aim of improving its operating efficiency and control precision.

2015-08-18
Brief Discussion on Bored Pile Construction with Rotary Drilling Rigs for Bridges

Cast-in-place pile foundations are a commonly adopted foundation structure in current bridge construction. The quality of bridge foundation design and construction is a fundamental issue affecting the quality of the entire bridge. Only by fully understanding the classification and characteristics of bridge foundations and grasping the applicable scope of each foundation type can construction be carried out safely and efficiently.

2015-08-18

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