Long rectangular box jacking project: A case study

Chen, Xiaolong; Ma, Baosong; Najafi, Mohammad; Zhang, Peng

doi:10.1016/j.undsp.2019.08.003

Cited by 52 publications

(12 citation statements)

References 14 publications

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“…This technology has undergone rapid development in China despite its relatively late introduction in the country. With the increase need for developing and utilizing underground spaces in urban areas, rectangular pipe jacking technology has been widely employed in diverse applications, such as urban underground pedestrian crossing tunnels [1], entrance tunnels of subway stations D], municipal underground roads and railways [4][5][6], and utility tunnels [7][8][9]. Rectangular jacked pipe tunnels often feature large cross section to satisfy the demands of expressways and large traffic volumes.…”

Section: Introductionmentioning

confidence: 99%

Field research on supersized rectangle pipe-jacked tunnels beneath a navigable river in the urban area

Fang,

Jiang,

Gao

2024

IOP Conf. Ser.: Earth Environ. Sci.

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With technological progress in recent years, supersized rectangular jacked pipe tunnels have been increasingly used for developing urban road-crossing nodes, owing to their convenient construction and economic benefits. However, owing to the weak waterproofing performance of the joint, jacked supersized rectangular pipes have been employed beneath a navigable river. This study used on-site monitoring data of an underground expressway with supersized rectangular jacked pipe tunnels in Shanghai. Additionally, we analyzed the deformation of the ground surface and embankment and the mutual influence of jacked adjacent pipes. The results revealed the following. 1) the over-excavation of the jacked pipe causes partial surface subsidence. The jacking parameters were adjusted through feedback to control the surface deformation. 2) The spatial deformation of the old embankment were stabilized, suggesting the successful realization of micro-disturbance jacking construction. 3) The secondary disturbance of the soil due to post-construction causes a slight sinking and tilting trend of the former jacked tunnel.

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Section: Introductionmentioning

confidence: 99%

Field research on supersized rectangle pipe-jacked tunnels beneath a navigable river in the urban area

Fang,

Jiang,

Gao

2024

IOP Conf. Ser.: Earth Environ. Sci.

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“…[1][2][3] Nowadays, the development trend of pipe jacking engineering is characterized by longer pipeline, more complex strata and larger pipe diameter and, consequently, more demanding technical performance of jacking pipes are required. [4][5][6] Traditional reinforced concrete pipe (RCP) are frequently used, this being prone to crack during the installation (due to the thrust of the boring machine) and/or during service condition, this leading to jeopardize the durability of the pipeline. 7,8 In this regard, in case of corrosion of the steel bars, the structural safety of the pipeline is compromised and expensive maintenance programs are required, these being a conditioning for the pipeline operativity.…”

Section: Introductionmentioning

confidence: 99%

“…Pipe jacking has widely been used as trenchless pipeline construction technology within the field of oil and gas transmission, hydraulic engineering, and municipal sewage pipelines, among other 1–3 . Nowadays, the development trend of pipe jacking engineering is characterized by longer pipeline, more complex strata and larger pipe diameter and, consequently, more demanding technical performance of jacking pipes are required 4–6 . Traditional reinforced concrete pipe (RCP) are frequently used, this being prone to crack during the installation (due to the thrust of the boring machine) and/or during service condition, this leading to jeopardize the durability of the pipeline 7,8 .…”

Section: Introductionmentioning

confidence: 99%

Basalt‐polypropylene fiber reinforced concrete for durable and sustainable pipe production. Part 2: Numerical and parametric analysis

Deng

Liu

Chen

et al. 2021

Structural Concrete

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A nonlinear 3D FEM was developed for reproducing the three‐edge bearing test (TEBT) of pipes. The model was validated by considering the experimental results on standard reinforced concrete pipes (RCPs) and fiber‐reinforced concrete pipes (FRCPs) with 1000 mm internal diameter presented in the Part 1. The relative error between numerical simulation and laboratory test results for both the service (D0.3) and the ultimate (Du) D‐load (DL) were lesser than 2.1% and 6.3%, respectively. Additionally, a new structural design process that takes into consideration the geometric and mechanical variables involved into the TEBT of pipes, including the type and reinforcement configuration, is proposed. Because of applying this approach, design‐oriented tables with minimum steel‐cage reinforcement ratios for RCPs and FRCPs valid for pipes with inner diameters ranging from 300 mm to 1800 mm are established for the pipe strength classes I to V and wall thickness A, B, and C defined in the ASTM C76. Based on the numerical results, it can be confirmed that the hybrid use of basalt‐polypropylene fibers permits to reduce the steel reinforcement ratio respect to the equivalent RCP and, for some diameters and strength classes, the total elimination. These results represent a step forward in the use of fiber reinforced concrete in the pipe industry, which can lead to more durable and sustainable piping products.

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“…In contrast, advanced trenchless methods, such as the shielding tunneling method and pipe-jacking, are more advantageous because of their reduced negative effect, especially in dense urban areas. The shield tunneling method relies on the costly tunnel boring machine (TBM) and it is applied mainly to segmented tunnels whose diameter is more than 5 m. Pipe-jacking (or microtunneling method) is used to construct small-diameter utility tunnels such as sewerage, gas and water mains, oil pipelines, electricity and telecommunications cable ducts, and drainage culverts (3)(4)(5)(6)(7).…”

mentioning

confidence: 99%

“…The pipe-jacking method outperforms traditional trench methods in many aspects, such as lower environmental disturbance, lower overall cost, shorter construction period, and less rehabilitation ( 4 , 8 ). As shown in Figures 1 and 2, the schematic of the earth pressure balance (EPB) pipe-jacking method is presented, and the main construction process consists of the following steps: (a) The TBM machine is installed at the launch shaft by lifting equipment and positioned at the designated distance ahead of the hydraulic jacking system; (b) the first tunnel segmental ring is put between the TBM machine and the jacking rigs, and is then pushed into the ground.…”

mentioning

confidence: 99%

Case Study of the Largest Concrete Earth Pressure Balance Pipe-Jacking Project in the World

Jiang

Zhang

Wang

et al. 2022

Transportation Research Record: Journal of the Transportation R

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Pipe jacking has been the dominant trenchless technology for constructing small (<2 m) to medium-diameter (<4 m) tunnels. Uncertainties and construction difficulties increase significantly when the diameter of the tunnel exceeds 4 m. This paper presents a case study of the largest concrete pipe-jacking tunnel project in the world, the sewerage tunnel along Jinshan Lake, Zhenjiang, China. In this project, an underwater tunnel with a diameter of 4.67 m was constructed by the earth pressure balance (EPB) pipe-jacking method. The case study reports project background, and geological and hydrogeology conditions. The key techniques such as the selection of pipe-jacking machine, jacking force estimation and control, design of intermediate jacking station, grouting process control, launching, and reception of the tunnel boring machine, trajectory control of pipe jacking, and ventilation and gas monitoring during the construction period were investigated and discussed. Furthermore, to overcome the technical difficulties associated with the oversized jacked tunnel, the corresponding countermeasures were adopted point by point, so that the safety of the whole project could be guaranteed. This study filled the knowledge gap of technical know-how for large-diameter (over 4.5 m) pipe-jacking tunnel and is expected to provide practical guide for future large-diameter pipe-jacking tunnels.

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Long rectangular box jacking project: A case study

Cited by 52 publications

References 14 publications

Field research on supersized rectangle pipe-jacked tunnels beneath a navigable river in the urban area

Field research on supersized rectangle pipe-jacked tunnels beneath a navigable river in the urban area

Basalt‐polypropylene fiber reinforced concrete for durable and sustainable pipe production. Part 2: Numerical and parametric analysis

Case Study of the Largest Concrete Earth Pressure Balance Pipe-Jacking Project in the World

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