Manufacturing and Hoisting Technology for Reinforcement Cage of Deep Foundation Excavation Bored Piles

2014 ◽  
Vol 1044-1045 ◽  
pp. 633-637 ◽  
Author(s):  
Xin Zhou ◽  
Guang Xiu Fang ◽  
Ping Zhang ◽  
Yuan Qing Leng
Keyword(s):  
Steel Reinforcement ◽  
Detailed Calculation ◽  
Construction Technology ◽  
Deep Foundation ◽  
Foundation Pit ◽  
Element Analysis ◽  
Bored Pile ◽  
Steel Processing ◽  
Deep Foundation Excavation ◽  
Set Up

Combined with the Beijing Business Center (CBD) core district Z14 plots commercial finance project (hereinafter referred to as the "CBD project") foundation pit construction, introduces the deep foundation pit of bored pile reinforcement cage fabrication and erection construction technology. In the construction process, through the site set up a special steel processing and production platform, the localization of the flange and other measures to solve the steel reinforcement cage positioning and connection construction difficulties. Combining the engineering fact, detailed calculation process of lifting steel cage hanging position, lifting machinery and hoisting rigging selection, and through the ANSYS software of finite element analysis and put forward specific measures to ensure the quality of steel reinforcement cage.

2D Finite Element Analysis of a Excavation Supporting Types in Changchun City

2014 ◽  
Vol 536-537 ◽  
pp. 1589-1593 ◽  
Author(s):  
Xiu Xiu Liu ◽  
Guang Li Sun ◽  
Chao Sun
Keyword(s):  
Finite Element ◽  
Deep Foundation ◽  
Foundation Pit ◽  
Element Analysis ◽  
Foundation Soil ◽  
Finite Element Software ◽  
Excavation Process ◽  
Excavation Work ◽  
Deep Foundation Excavation ◽  
Stress And Deformation

In this paper, By using a large common ABAQUS finite element software to simulate a hospital,s deep foundation pit excavation process in Changchun, Contrasting respectively pile-anchor retaining structure which had been adopted in the project with pile-strut bracing structure. Obtaining stress and deformation of soil and the stress and deformation of pile under the two supporting types, Analysis of the two supporting types feature only from the perspective of the force and deformation in foundation soil and piles, To provide a reference for future support in deep foundation excavation work.

Safety Assessment on Retaining and Protecting of Deep Foundation Excavation Adjacent to the Existing Railway

2013 ◽  
Vol 361-363 ◽  
pp. 1511-1514
Author(s):  
Wen Jing Si ◽  
Yu Jie Wang ◽  
Ying Fu Gao ◽  
Hui Zhou
Keyword(s):  
Horizontal Displacement ◽  
Surface Settlement ◽  
Deep Foundation ◽  
Foundation Pit ◽  
Overturning Stability ◽  
Neighboring Structure ◽  
Deep Foundation Excavation ◽  
Set Up ◽  
The Stability ◽  
Stability Checking

Mizhuo highway overpass crosses Jingha railway. Deep foundation excavation can cause the neighboring structure safety factor drops. To ensure the stability of the Jingha railway embankment, retaining and protecting of deep foundation excavation was set up around the foundation pit. The incremental calculation method was used to analyze the stress deformation of retaining pile and surface settlement near the deep foundation pit. The overall stability checking and anti-overturning stability checking of deep foundation excavation meet the specification requirements. The maximum horizontal displacement of retaining pile is 6.0 mm and 6.6 mm respectively. Surface settlement can not impact the existing railway embankment. In construction practice the retaining pile can be able to effectively ensure the safety of the neighboring structure and to reduce the probability of accidents.

Method for Getting the Soil Elastic Modulus in the Finite Element Analysis of the Deep Foundation Excavation in Tianjin

2012 ◽  
Vol 170-173 ◽  
pp. 386-389
Author(s):  
Shi Lun Feng ◽  
Pu Lin Li ◽  
Jun Li ◽  
Yuming Zhou
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Elastic Modulus ◽  
Three Dimensional ◽  
Soil Parameters ◽  
Deep Foundation ◽  
Foundation Pit ◽  
Element Analysis ◽  
Finite Element Software ◽  
Deep Foundation Excavation

The finite element method has been used widely in foundation pit engineering to simulate the deep foundation excavation, but it is troublesome and time-consuming to get the important calculation parameter of the soil elastic modulus. So a method based on the comon soil parameters is proposed to get the soil elastic modulus. And a real foundation excavation was simulated using the finite element software ABAQUS and the soil elastic modulus got according to the proposed method. The three-dimensional finite element analysis results were compared to the field data, and both results were close to each other.

Finite Element Analysis and Investigation of Double-Row Piles Supporting Structure

2013 ◽  
Vol 838-841 ◽  
pp. 779-785
Author(s):  
Liang Gu
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Stress Distribution ◽  
Maximum Shear Stress ◽  
Horizontal Displacement ◽  
Deep Foundation ◽  
Foundation Pit ◽  
Double Row ◽  
Element Analysis ◽  
Supporting Structure

The double-row piles supporting structure is a new type of supporting and protecting for deep foundation excavation. It is widely used to in design of deep foundation pit. Now how to simply and effectively design the structure of double-row piles is in a research and discuss stage. Using the Midas GTS finite element method, the displacement and stress distribution of double-row piles in the different stages of excavation are obtained, and the horizontal displacement and stress distribution of double-row piles in the different stages of excavation are calculated. The results of Midas GTS finite element analysis as follows: (1) after the excavation of foundation pit, the horizontal displacement of pile-top is maximum. The horizontal displacement decreases gradually with depth increases. And the displacement of front row piles is larger than that of back row piles; (2) the maximum shear stress is at the distance 5m to the foundation basement. The higher bending moment at the pile-top and the distance 10m to the foundation basement are consistent with the actual monitoring date. (3) the results of finite element analysis is close to the Richard software and actual monitoring data. It is show that using the finite element analysis to analyze the double-row piles supporting structure with is veritable and credible.

Weight Analysis of Accident Factors in Deep Foundation Excavation Based on Analytic Hierarchy Process

2014 ◽  
Vol 711 ◽  
pp. 529-534
Author(s):  
Zi Sheng Yang ◽  
Jun Xia Liu ◽  
Yi Ren Wang
Keyword(s):  
Analytic Hierarchy Process ◽  
Deep Foundation ◽  
Accident Rate ◽  
Foundation Pit ◽  
Analytic Hierarchy ◽  
Weight Analysis ◽  
Deep Foundation Excavation ◽  
Hierarchy Process ◽  
Factor Set ◽  
Design Construction

For the past few years, great development has been achieved in deep foundation excavation. However, due to foundation excavation’s locality, individual diversity, complexity and uncertainty, the probability of accidents in foundation pit engineering tends to be greater than that in main works, and the accident rate may even reach about 20%, which makes the study on factors leading to foundation excavation accidents quite necessary and meaningful. By use of Analytic Hierarchy Process (AHP), this paper has figured out the ratio (weight) of the investigation, design, construction and other factors leading to foundation excavation accidents to the whole factor set, which is of great guiding significance to the study on prevention and treatment of foundation excavation accidents in future.

Non-Linear Three-Dimensional Finite Element Analysis of Some Extremely Deep Foundation Pit Support

2013 ◽  
Vol 443 ◽  
pp. 79-83
Author(s):  
Zhen Xi Yu
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Simulation Analysis ◽  
Three Dimensional ◽  
Deep Foundation ◽  
Foundation Pit ◽  
Element Analysis ◽  
Deep Foundation Pit ◽  
Three Dimensional Finite Element ◽  
Support Engineering

In recent years, with the enhancement of overall national strength in China, the computer simulation technology has been developed rapidly and widely applied to engineering construction. Particularly, investment proportion of the technology in deep foundation pit engineering is immense. Yet affected by national conditions in China, the construction and application of deep foundation pit engineering have many extensive factors. It also results in insufficient vigor of finite element analysis of deep foundation pit support construction. In this way, construction problems arise frequently under the condition that there exist buildings around. With some deep foundation pit support engineering, the thesis conducts simulation analysis of the engineering through the technology of nonlinear three-dimensional finite element.Project profile

Control of Artificial Recharge on Foundation Pit Deformation due to Dewatering

2012 ◽  
Vol 594-597 ◽  
pp. 1901-1904
Author(s):  
Hua Yuan ◽  
Yan Hong
Keyword(s):  
Artificial Recharge ◽  
Deep Foundation ◽  
Foundation Pit ◽  
Deformation Control ◽  
Adjacent Building ◽  
The Difference ◽  
Prevention Method ◽  
Deep Foundation Excavation ◽  
Controlling Measures ◽  
Control Principle

In this paper, the currently available, feasible controlling measures for the deformation of foundation excavation and its surrounding environment are summarized systemically, which is mainly embodied in pit collapse, adjacent building differential settlement as well as underground pipeline cracking. Then first from the two aspects: artificial recharge used as prevention method and management measure separately, the paper illustrates the control principle, operation method and matters needing attention during artificial recharge. In addition, the difference between pumping well and recharge well are discusses. The research results will provide direction for the deformation control of deep foundation excavation and the operation of artificial recharge.

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