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Transfer Mechanism of Soil Plugging Effect in PHC Jacked Pipe Piles

This paper briefly introduces the force analysis of soil plugs and the corresponding mathematical analytical solutions, and explains that the soil plugging effect and the soil squeezing effect constrain and influence each other. The arching effect in sandy soil is the reason why denser sandy soils are more prone to forming taller soil plugs. The influence of the soil squeezing effect on pile side friction resistance requires parallel comparative tests between open-ended piles and closed-ended piles with different soil plugging ratios before conclusions can be drawn. Finally, the ultimate bearing capacity of piles is corrected based on the soil squeezing effect and the soil plugging effect.

2015-08-25
Soil Squeezing Effects of Jacked Pipe Piles in Soft Soil Foundations and Their Prevention Measures

The soil squeezing effect generated during the installation of jacked pipe piles is very pronounced. This paper presents a number of effective and practical measures, from both design and construction perspectives, for preventing or mitigating the soil squeezing effect of pile jacking.

2015-08-25
Measures to Prevent Quality Problems in Pipe Pile Construction in Soft Soil Areas

In response to the common quality problems in the construction of prestressed concrete pipe piles in the typical soft soil areas of the Hangjiahu region in Zhejiang, this paper proposes methods and measures to control pile foundation quality during pile sinking construction and earthwork excavation, prevent quality accidents such as pipe pile deviation, inclination, and fracture, improve the qualification rate of pile foundation acceptance, and ensure engineering quality and safety.

2015-08-25
Effect of Different Post-and-Core Systems on the Fracture Resistance of Teeth with Weakened Root Canals After Restoration

Objective: To compare the fracture resistance of dental hard tissues after restoration of weakened root canals with two different post-and-core systems. Methods: Thirty maxillary canines recently extracted intact due to periodontal disease were selected. The crowns were sectioned 2 mm coronal to the lowest point of the labial cementoenamel junction. After complete root canal treatment, each tooth was prepared to simulate a weakened root canal under clinical conditions and randomly divided into groups A and B, with 15 teeth in each group. Group A underwent reinforcement of the weakened root canal with DUO-LINKTM dual-cure resin, followed by post-and-core restoration with D.T. Lightpost fiber posts and Light-Core light-cure resin core material. Group B was restored with nickel-chromium cast alloy post-and-core. After completion of the post-and-core restoration, both groups received nickel-chromium metal full crowns. After embedding in self-curing acrylic resin, the specimens were fixed on a universal testing machine to test the fracture strength of the experimental teeth, and the readings were recorded and

2015-08-25
Design and Construction of Vibro-Replacement Stone Columns for Treating Liquefiable Soil Foundations

Soft foundation is a common geological phenomenon in highway engineering construction, and if not properly treated, it can cause enormous harm to highways. There are currently many types of soft foundation treatment methods, each with its own characteristics. In this paper, the author elaborates on the design method of vibro-replacement stone columns for treating liquefiable soil foundations combined with engineering examples, so that everyone can share more experience and methods in the field of soft foundation treatment.

2015-08-25
Discussion on Common Problems and Preventive Measures in Static Pressure Pipe Pile Construction

Because static pressure pipe piles have a wide range of applications, they are suitable not only for cohesive soils with soft overlying soil layers and hard bearing strata, but also for sites with dense gravelly soil and strongly weathered rock layers. In construction, they also offer advantages such as no noise pollution, no vibration, simple pile splicing, clear display and easy recording during the construction process, stable and reliable construction quality, high cost-effectiveness, and simple construction technology, and are therefore widely used in high-rise building projects. This paper analyzes common problems at static pressure pipe pile construction sites and introduces solutions and strategies.

2015-08-25
Clinical Analysis of Glass Fiber Reinforced Composite Resin Post in the Restoration of Residual Crowns and Residual Roots

Objective: To investigate the efficacy of glass fiber reinforced composite resin posts in the restoration of tooth defects. Methods: A total of 86 patients with 128 severely defective teeth were selected. Glass fiber reinforced composite resin posts were used, and metal-ceramic crowns or all-ceramic crowns were fabricated for restoration. The patients were followed up for 3 months to 2 years to observe the restorative outcomes. Results: In 126 teeth, the restorations were intact and stable, with no loosening or dislodgement of the post-crown, and no fracture of the glass fiber posts or root fracture was observed. In 2 cases, the post-crown became loose and dislodged, but the glass fiber posts remained intact without root fracture; after appropriately reducing the occlusal contact points of the restoration and re-cementing, the retention was good, and no further loosening occurred during follow-up to date. Conclusion: Glass fiber reinforced composite resin posts have high strength, good color, and are easy to manipulate, making them a favorable supporting material in the restoration of tooth defects.

2015-08-25
Construction Technology and Quality Control of PHC Static-Pressed Pipe Piles

Combined with an engineering case study, this paper describes in detail the construction technology and methods for PHC static-pressed pipe piles, including the key control points of the construction process. Through reasonable selection and matching of pile lengths, savings in pile material and construction convenience are achieved. Meanwhile, by pre-boring before pile pressing, proper pile driving (following) and construction monitoring, damage to the waterproof curtain is avoided and impacts on surrounding buildings and pipelines are prevented, providing a useful reference for similar projects.

2015-08-25
Management Guidelines for High-Strength Prestressed Concrete Pipe Piles and Their Application in Construction

Drawing on extensive engineering practice, this paper discusses several specific issues that warrant attention in the design and construction of high-strength prestressed concrete pipe piles, offering reference for peers in the industry.

2015-08-25
Professional Ground Improvement Treatment to Prevent Tilting of Precast Concrete Pipe Piles

Precast concrete pipe piles are widely used because of their many advantages, including quality assurance, convenient construction, short construction time, low cost, and good seismic performance. Based on engineering case studies, this paper introduces the construction technology of precast concrete pipe piles, analyzes the causes of pile tilting, and proposes professional solutions addressing these causes for reference.

2015-08-25
Discussion on the Application of Precast Jacked Pipe Piles in Highway Soft Foundation Treatment

In highway soft foundation treatment, precast jacked pipe piles have been widely used due to their many advantages, such as high single-pile bearing capacity, high construction quality, fast construction speed, and low construction cost, making them a relatively effective method for treating deep and thick soft foundations. Based on a specific highway engineering case, and on the basis of a brief overview of the selection of construction schemes and the advantages of precast jacked pipe piles, this paper analyzes the key construction technologies of precast jacked pipe piles in order to promote their popularization and application.

2015-08-25
Threaded Root Canal Post-Assisted Retention for Repairing Large-Area Coronal Defects in Molars

To observe the efficacy of threaded root canal post-assisted retention in repairing large-area coronal defects in molars. Methods: Threaded root canal posts were used for intracanal retention, and amalgam was used to fill and repair large-area coronal defects in molars. Results: Over a follow-up of 3 to 5 years, treatment succeeded in 49 of 54 affected teeth, with normal masticatory function, while 5 cases failed. Conclusion: Root canal post-assisted retention is effective for repairing large-area coronal defects in molars.

2015-08-25

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