In this study,the research progress of trenchless piping technology for pipes with a large diameter was reviewed.The geological conditions of the sandbar in Xiangyang were taken into account in this study.This paper h...In this study,the research progress of trenchless piping technology for pipes with a large diameter was reviewed.The geological conditions of the sandbar in Xiangyang were taken into account in this study.This paper highlights the construction process management of the pipeline network project in Yuliangzhou Starting Area of Xiangyang City.Research was carried out in the aspects of optimizing mud ratio,controlling pipeline elevations,pipeline welding,and trenchless pipeline construction in limited spaces,stable support during pit excavation,and controlling the spacing between the junctions of two pipe segments.The research resulted in excellent outcomes and ensured safe construction,and the quality requirements were also met.展开更多
The city of New Owerri Nigeria is situated on a flat terrain and rainfall pattern is tropical high. The area is the seat of Government of Imo state and is crisscrossed by network of dual carriage roads adjoining exclu...The city of New Owerri Nigeria is situated on a flat terrain and rainfall pattern is tropical high. The area is the seat of Government of Imo state and is crisscrossed by network of dual carriage roads adjoining exclusive housing complexes. The road drainage system comprises open concrete drains on both sides of the cambered asphalt pavement. Much of the area is often flooded after a torrential rainfall and the flood water remains in the drains as long as evaporation permits. A study shows that the scenario is due to a number of factors, amongst which siltation and vegetal growth in the drains, poor drainage outlets are, very gentle terrain and poor maintenance culture. The standing pools of water in the drains sustain massive breeding of mosquitoes which constitute health hazard. Replacement of open concrete drains with properly designed trenches backfilled with permeable earth materials, sand, and overlay of grasses does not only reduce standing time of flood water but completely eliminates stagnant water. The method makes use of enlarged surface area of infiltration provided by the trenchless drain and millions of infiltration channels provided by the grass rootlets.展开更多
The subsurface space in urban areas is an important asset.However,the information available on this environment is relatively poor compared to above ground information.This paper proposes a Building Information Model(...The subsurface space in urban areas is an important asset.However,the information available on this environment is relatively poor compared to above ground information.This paper proposes a Building Information Model(BIM)for underground applications as means to address this information gap.The creation and progressive update of BIM for a constructed artefact ensures that data on the structures is available and can be used throughout its lifetime.A BIM for underground applications integrates data on surface structures,such as buildings,and subsurface infrastructures,such as pipes,along with details of the surrounding ground,the associated soil and rock properties and groundwater regime into a single framework.This approach is demonstrated by applying it to trenchless construction operations,including a microtunnelling project for a new sewer.The data from this extended BIM concept can be interactively used with analysis packages to conduct risk assessments for new construction activities.It also shows how BIM for the Underground can be used throughout the planning,construction and post-construction stages of a project,and,importantly,how this information can be available for future projects.展开更多
The application of trenchless technology is the trend of underground public facilities'installation,replacement and repairing.As the soil-engaging component during penetrating bore,the working resistance of penetr...The application of trenchless technology is the trend of underground public facilities'installation,replacement and repairing.As the soil-engaging component during penetrating bore,the working resistance of penetration head has remarkable effect on energy consumption of the whole working process.Some typical soil-digging animals,like pangolin and earthworm,they own special micro structures on their surface.It has been widely proved that some micro geometrical structures can effectively reduce adhesion resistance.Four kinds of bionic penetration heads were designed by imitating micro geometrical structures inspired by the soil animals.In this work,the real time jacking forces of the bionic penetration heads were measured and compared with a smooth penetration head(control group)without micro geometrical structures.The result indicated that the jacking forces of the bionic penetration heads were smaller than that of the smooth penetration head.This proved that the bionic penetration heads have the ability of reducing adhesion resistance.The vertical concave penetration head got the smallest jacking force,of which the average jacking force was 18.7%lower than that of the smooth penetration head.The interaction between soil and bionic surface of penetration head was discussed on the condition of wet friction.The bionic surface reduced the adhesion resistance by disturbing the soil and braking the continuous water film between soil and the surface of the penetration head.展开更多
文摘In this study,the research progress of trenchless piping technology for pipes with a large diameter was reviewed.The geological conditions of the sandbar in Xiangyang were taken into account in this study.This paper highlights the construction process management of the pipeline network project in Yuliangzhou Starting Area of Xiangyang City.Research was carried out in the aspects of optimizing mud ratio,controlling pipeline elevations,pipeline welding,and trenchless pipeline construction in limited spaces,stable support during pit excavation,and controlling the spacing between the junctions of two pipe segments.The research resulted in excellent outcomes and ensured safe construction,and the quality requirements were also met.
文摘The city of New Owerri Nigeria is situated on a flat terrain and rainfall pattern is tropical high. The area is the seat of Government of Imo state and is crisscrossed by network of dual carriage roads adjoining exclusive housing complexes. The road drainage system comprises open concrete drains on both sides of the cambered asphalt pavement. Much of the area is often flooded after a torrential rainfall and the flood water remains in the drains as long as evaporation permits. A study shows that the scenario is due to a number of factors, amongst which siltation and vegetal growth in the drains, poor drainage outlets are, very gentle terrain and poor maintenance culture. The standing pools of water in the drains sustain massive breeding of mosquitoes which constitute health hazard. Replacement of open concrete drains with properly designed trenches backfilled with permeable earth materials, sand, and overlay of grasses does not only reduce standing time of flood water but completely eliminates stagnant water. The method makes use of enlarged surface area of infiltration provided by the trenchless drain and millions of infiltration channels provided by the grass rootlets.
基金The authors gratefully acknowledge the financial support of EPSRC to Stylianos Providakis to enable him to undertake his doctoral studies,notably via the following grants:Balancing the impact of City Infrastructure Engineering on Natural Systems using Robots(EP/N010523)City(EP/K021699)and UKCRIC—National Buried Infrastructure Facility(EP/P013635).The visualisations shown in this paper were produced using SketchUp Pro(Inc,2016).
文摘The subsurface space in urban areas is an important asset.However,the information available on this environment is relatively poor compared to above ground information.This paper proposes a Building Information Model(BIM)for underground applications as means to address this information gap.The creation and progressive update of BIM for a constructed artefact ensures that data on the structures is available and can be used throughout its lifetime.A BIM for underground applications integrates data on surface structures,such as buildings,and subsurface infrastructures,such as pipes,along with details of the surrounding ground,the associated soil and rock properties and groundwater regime into a single framework.This approach is demonstrated by applying it to trenchless construction operations,including a microtunnelling project for a new sewer.The data from this extended BIM concept can be interactively used with analysis packages to conduct risk assessments for new construction activities.It also shows how BIM for the Underground can be used throughout the planning,construction and post-construction stages of a project,and,importantly,how this information can be available for future projects.
基金This work was supported by the National Natural Science Found of China(Grant No.51875245)the National Key R&D Program Projects(Grant No.2016YFD0701102)+3 种基金the Science-Technology Development Plan Project of Jilin Province(20190303003SF and 20190303012SF)the Changchun Science and Technology Project of Changchun(Grant No.18DY007)the Special Project of Industrial Technology Research and Development of Jilin Province(Grant No.2018C036-2)the“13th Five-Year Plan”Scientific Research Foundation of the Education Department of Jilin Province(Grant Nos.JJKH20180225KJ and JJKH20190198KJ).
文摘The application of trenchless technology is the trend of underground public facilities'installation,replacement and repairing.As the soil-engaging component during penetrating bore,the working resistance of penetration head has remarkable effect on energy consumption of the whole working process.Some typical soil-digging animals,like pangolin and earthworm,they own special micro structures on their surface.It has been widely proved that some micro geometrical structures can effectively reduce adhesion resistance.Four kinds of bionic penetration heads were designed by imitating micro geometrical structures inspired by the soil animals.In this work,the real time jacking forces of the bionic penetration heads were measured and compared with a smooth penetration head(control group)without micro geometrical structures.The result indicated that the jacking forces of the bionic penetration heads were smaller than that of the smooth penetration head.This proved that the bionic penetration heads have the ability of reducing adhesion resistance.The vertical concave penetration head got the smallest jacking force,of which the average jacking force was 18.7%lower than that of the smooth penetration head.The interaction between soil and bionic surface of penetration head was discussed on the condition of wet friction.The bionic surface reduced the adhesion resistance by disturbing the soil and braking the continuous water film between soil and the surface of the penetration head.
