A new type of PHC pile-sinking technology: Drilling with PHC Pipe Cased Pile and its development directions

Hou, Zhenkun; Tang, Mengxiong; Hu, Hesong; Lin, Zegeng; Zhao, Shiyuan; Zhang, Shuo

doi:10.1088/1755-1315/580/1/012013

Cited by 3 publications

(2 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Note that the pile-end grouting effect is the key to ensuring the piles' high bearing capacity and reducing pile settlement. 12,13 Since grouting technology is used in underground engineering and forms a concealed structure, there is no effective means to monitor and evaluate the reinforcement effect of grouting. 14 Therefore, it is crucial to study the flow diffusion mechanism of cement slurry in the reserved space for grouting and the effect of penetration and reinforcement in the soil around the piles.…”

Section: Introductionmentioning

confidence: 99%

“…It has a higher mechanization degree, wider adaptability, and larger bearing capacity than the traditional piles. Note that the pile‐end grouting effect is the key to ensuring the piles' high bearing capacity and reducing pile settlement 12,13 . Since grouting technology is used in underground engineering and forms a concealed structure, there is no effective means to monitor and evaluate the reinforcement effect of grouting 14 .…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Numerical analysis of slurry flow in pile‐end grouting of the drilling with prestressed concrete pipes

Wang,

Cui,

Shan

et al. 2023

Structural Concrete

View full text Add to dashboard Cite

Understanding the diffusion law of cement slurry is the key to analyzing and evaluating the reinforcement effect of grouting. This study aimed to reveal the flow grouting mechanism of slurry in the reserved space between piles and soil and the penetration diffusion rule of slurry in the soil around the piles. For this purpose, the grouting slurry was regarded as a Newtonian fluid. The Navier–Stokes equations of fluid mechanics and renormalization group k–ε model were used to study the flow diffusion of slurry in the reserved space around a pile for grouting the drilling with prestressed concrete pipes. The permeability of soil slurry was determined using Darcy's law, and the flow field of slurry during grouting was numerically simulated. The results showed that the flow velocity of slurry and the reinforcement effect of grouting decrease gradually as the flow path extends. The radial flow of slurry in the grouting pipe shows a clear trend of circumferential diffusion. The slurry thickness in the reserved space for grouting decreases with an increase in the distance from the grouting outlet. Its attenuation trend becomes more obvious with increasing grouting height. The grouting thickness directly reflects the filling effect of slurry and is an important index to evaluate the grouting effect of drilling with prestressed concrete pipes.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Numerical analysis of slurry flow in pile‐end grouting of the drilling with prestressed concrete pipes

Wang,

Cui,

Shan

et al. 2023

Structural Concrete

View full text Add to dashboard Cite

show abstract

Assessment of the impact of pile manufacturing technology on surrounding buildings in soft soils

Kopteva

Osokin²,

Kuchin³

et al. 2023

E3S Web Conf.

View full text Add to dashboard Cite

Nowadays, the decrease in number of urban areas for buildings is observed. Therefore, a novel construction of buildings has to be carried out in dense buildings areas. Construction buildings in historical districts become the most complicated goal. In order to preserve the cultural heritage, to ensure the safety of existing buildings and structures, and also safe building under, it is necessary to competently select the technology of digging pile foundations. Technological precipitation usually occurs at dynamic and vibration effects during the operation of equipment on the site and at pile construction. These effects cannot be analysed and depend on the quality of the work performed, the equipment chosen correctly and the technology applied. It is intended to eliminate the possible technological precipitation of buildings in the surrounding area by applying gentle technology-intensive operations. The article provides and systematizes defects that occur during CFA (Continuous Flight Auger), DDS (Drilling Displacement System), etc. The analysis of factors that influence on the appearance of defects has been made, and also the estimation of technologies from the preparation of wells when installing drilling and embroidery piles on the surrounding development in weak soils has been made.

show abstract

Optimization of the Physical and Mechanical Properties of Grouting Material for Non-Soil-Squeezing PHC Pipe Pile

2021

Self Cite

View full text Add to dashboard Cite

The physical and mechanical properties of grouting materials greatly affect the friction resistance and the bearing performance of a non-soil-squeezing PHC pipe pile. Orthogonal tests for four factors at five levels were carried out to optimize the proportion of the water–cement mixture by using Portland cement as a raw material and a water-reducing agent, expansion agent and early-strength agent as additives. The following conclusions were obtained: (1) Both the water–cement ratio and the dosage of water-reducing agent are positively correlated with the fluidity of the water–cement mixture and have the greatest influence on the fluidity, followed by the expansion agent and early-strength agent. The saturation point of the water-reducing agent is 1.5%. (2) The strength of the grouting body decreases linearly with the increase of the water–cement ratio, and the dosage of the water-reducing agent has no obvious effect on the strength. As the dosage of expansion agent increases, the strength of the grouting body decreases rapidly. The expansion agent mainly plays a key role in the middle and late stages of the hardening process of the slurry. Early-strength agents have a greater impact on the early strength, but less on the later strength. When the slurry is solidified for 3 h, the early-strength agent has the greatest impact on the strength with an optimal dosage of 5%. (3) The volume of the grouting body has an inverse relationship with the water–cement ratio, and the optimal amount of expansion agent is 12%. The incorporation of an expansion agent makes the volume increase of the grouting body exceed the volume shrinkage ratio caused by the hardening of the grouting body with a curing time of more than 3 days, ensuring a slight increase in the volume of the grouting body. After 3 days, even though the effect of the expansion agent is gradually weakened, it can still ensure that the volume of the grouting body does not shrink. With the increase of the amount of water-reducing agent, the volume of the grouting body gradually decreases. When the amount of water-reducing agent exceeds 1.5%, the volume of the grouting body no longer decreases. (4) The early-strength agent has almost no effect on the volume of the grouting body. When the curing time is 3 h, the water–cement ratio has the greatest influence on the volume of the grouting body, followed by the water-reducing agent, and, finally, the expansion agent. After 3 h, the water–cement ratio still has the greatest influence, and the influence of the expansion agent gradually exceeds that of the water-reducing agent. The water-reducing agent mainly affects the volume of the grouting body in the water separation stage, and the expansion agent mainly plays a role in the middle and late stages of the slurry solidification. After optimized ratio analysis, the fluidity of the water–cement mixture can be improved, the volume shrinkage ratio rate can be lowered and the early strength can be increased.

show abstract

A new type of PHC pile-sinking technology: Drilling with PHC Pipe Cased Pile and its development directions

Cited by 3 publications

References 3 publications

Numerical analysis of slurry flow in pile‐end grouting of the drilling with prestressed concrete pipes

Numerical analysis of slurry flow in pile‐end grouting of the drilling with prestressed concrete pipes

Assessment of the impact of pile manufacturing technology on surrounding buildings in soft soils

Optimization of the Physical and Mechanical Properties of Grouting Material for Non-Soil-Squeezing PHC Pipe Pile

Contact Info

Product

Resources

About