Development of an Optimum Pre-Founded Column System for Top-Down Construction

Rhim, Hong C.; Kim, Kyung-Min; Kim, Seung-Weon

doi:10.3846/13923730.2012.723397

Cited by 11 publications

(13 citation statements)

References 11 publications

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“…Based on a bottom-up pile load test, Kim and Mission (2011) presented an improved evaluation of the equivalent load-displacement curve during TDM construction, which indicated that this curve agreed with the measured and simulated top-down curves, as validated in the case studies. In Korea, Rhim et al (2012) developed an optimum pre-formed column system for the TDM. The circular concretefilled tubular steel columns are preferred over the more popular H-shaped columns.…”

Section: Introductionmentioning

confidence: 99%

Field testing and analysis during top-down construction of super-tall buildings in Shanghai

Tang

Zhao

2016

KSCE Journal of Civil Engineering

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Although certain measurements regarding super-tall buildings constructed using the top-down method have been published, new advances in top-down construction have been developed with the construction of super-tall buildings in China. This paper presents the theory of soil-structure interactions in pile foundations and extends it to the top-down construction method. Based on this theory, the forces and the deformation of the diaphragm wall, slab and soldier piles at various stages of construction can be computed. Two typical tall buildings of 60 and 37 stories with deeply embedded 4-level and 5-level basements located in Shanghai were used as case studies of the vertical displacements of their diaphragm walls and soldier piles, the deflections of the diaphragm walls, the earth pressures, and the rebar stresses during top-down construction. The values measured in the field agree well with the predicted values from soilstructure interactions theory and statistical-empirical formulas. Two additional super-tall buildings of 101 and 121 stories, in which the 4-level and 5-level basements and the main buildings are round, are discussed regarding their unique deformational characteristics. In addition, the diaphragm wall can serve a load-sharing function. These engineering case studies, including the comprehensive predictions of deformation based on field tests and estimates using statistical formulas, can improve tall building design.

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Section: Introductionmentioning

confidence: 99%

Field testing and analysis during top-down construction of super-tall buildings in Shanghai

Tang

Zhao

2016

KSCE Journal of Civil Engineering

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“…Crowded urban areas in Asia have experienced a recent increase in the number of construction sites that employ top-down excavation methods [ 1 ]. Top-down methods are those where the both super and sub-structures are simultaneously built, and they are useful in urban areas where there are strict environmental regulations, lack of working space, and short construction times [ 2 ].…”

Section: Introductionmentioning

confidence: 99%

Exposure assessment of elemental carbon, polycyclic aromatic hydrocarbons and crystalline silica at the underground excavation sites for top-down construction buildings

et al. 2020

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Enclosed underground excavation worksite has an environment with poor ventilation and exposure to hazardous substances from diesel engine exhaust and construction materials. The objective of this study was to evaluate the exposure level of elemental carbon (EC), organic carbon (OC), total carbon (TC), polycyclic aromatic hydrocarbons (PAHs), dust and crystalline silica (CS) during underground excavation work for top down construction buildings. Active local air sampling for EC, OC, and TC (n = 105), PAHs (n = 50), dust (n = 34) and CS (n = 34) was conducted from inside and outside the excavator at underground excavation workshop in four different construction sites. EC, OC, TC and CS were sampled with each respirable and total particulates. EC, OC, and TC were collected on quartz-filter and analyzed using the thermal optical transmittance method. PAHs was collected on polytetrafluorethylene filter with XAD-2 and analyzed using liquid chromatography with fluorescence detector. CS and particulates were collected on poly vinyl chloride filter and analyzed using fourier-transform infrared spectroscopy. The geometric mean of respirable EC, OC, TC, total PAHs, respirable dust and respirable CS were 8.69 μg/m 3 , 34.32 μg/m 3 , 44.96 μg/m 3 , 6.818 μg/m 3 0.13 mg/m 3 and 0.02 mg/m 3 from inside the excavator and 33.20 μg/m 3 , 46.53 μg/m 3 , 78.21 μg/m 3 , 3.934 μg/m 3 , 0.9 mg/m 3 and 0.08 mg/m 3 from outside the excavator (underground excavation workshop), respectively. The EC and RCS concentration from outside the excavator is significantly higher than that of inside the excavator (p<0.01). The worksite with rock ground, higher vehicle density, blasting and enclosed environments had higher exposure to EC than other sites (p<0.05). There was no significant difference of EC concentration between total and respirable particulates. In top down construction sites, EC concentrations during underground excavation work exceeded recommended exposure limits as 20 μg/m 3 , accounted for about 50% of the total sample, and the level of concentration of RCS exceeded 1.5 times of occupational exposure limit, 0.05 mg/m 3 . Efforts are needed to minimize exposure to diesel engine exhaust and silica in underground excavation sites. Management of diesel engine vehicle, supply of fresh air and ventilation and introducing water facilities to create wet environment in underground worksites are strongly suggested.

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“…In addition, the consideration of the environmental effect of construction is also a big issue, especially in population‐concentrated urban areas, due to existing buildings, roads, and residents. To prevent public nuisance, such as noise, vibration, and dust, during construction, a top‐down construction method is widely used in major Asian cities in Korea, China, Japan, Singapore, and Taiwan . Top‐down construction methods have the advantage of being able to protect nearby buildings as well as underground structures and can thus be applied as an alternative construction method to the conventional bottom‐up construction method.…”

Section: Introductionmentioning

confidence: 99%

“…Usually, H‐shaped steel piles are commonly used as preinstalled columns to support structural load during the top‐down construction process. Even though the preinstalled columns still contain the capacity to support the structural load during the service period of the structure, the bearing capacity of the preinstalled column is usually ignored in the design of the mat foundation (footing) . Due to this, the design of the mat foundation (footing) tends to be conservative, which leads to thicker footing and higher construction costs.…”

Section: Introductionmentioning

confidence: 99%

“…To prevent public nuisance, such as noise, vibration, and dust, during construction, a top-down construction method is widely used in major Asian cities in Korea, China, Japan, Singapore, and Taiwan. [1][2][3][4] Top-down construction methods have the advantage of being able to protect nearby buildings as well as underground structures [5][6][7] and can thus be applied as an alternative construction method to the conventional bottom-up construction method. Using the top-down method also enables the simultaneous construction of both the superstructure and substructure, which reduces the construction period significantly.…”

Section: Introductionmentioning

confidence: 99%

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Load‐sharing ratio of prebored and precast pile in top‐down method construction process

Kim

Jeong

Jung

et al. 2018

Structural Design Tall Build

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Summary The load‐sharing ratio of the prebored and precast pile in top‐down method foundation was investigated by using a numerical analysis and field case study. The emphasis was on quantifying the apparent load‐sharing ratio of the prebored and precast pile during the top‐down method construction process. A series of three‐dimensional finite element analysis were conducted, with special attention given to the pile load‐sharing ratio under various conditions, such as soil condition, pile geometry, pile length, and structure load. In addition, the load‐sharing ratio of a single pile was also investigated based on the location of the pile in the raft (footing). The analysis model was validated by comparing the analysis model with the field data of an actual construction site using the prebored and precast pile and the top‐down method. On the basis of the series of analysis results and the field measurements, when the soil condition is better than weathered rock and for moderate pile length, at least 15% of the total structure load was supported by the pile throughout the construction process. Furthermore, it was shown that the pile near the center of the raft carried more structure load compared with the piles in the side and the corner of the raft.

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Development of an Optimum Pre-Founded Column System for Top-Down Construction

Cited by 11 publications

References 11 publications

Field testing and analysis during top-down construction of super-tall buildings in Shanghai

Field testing and analysis during top-down construction of super-tall buildings in Shanghai

Exposure assessment of elemental carbon, polycyclic aromatic hydrocarbons and crystalline silica at the underground excavation sites for top-down construction buildings

Load‐sharing ratio of prebored and precast pile in top‐down method construction process

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