Abstract:Regarding the inconsistency between the structural design concept of the prefabricated high-piled wharf and the large-scale development trend of the prefabricated high-piled wharf, this paper combs the present situation of the structural research of the prefabricated high-piled wharf and puts forward the design methods of the prefabricated modular high-piled wharf.The design process is discussed in detail from five aspects：design principles, structural forms, calculation methods, structural measures and durability design of prefabricated modular high-piled wharf, and the key factors to be considered in the design.According to the specific structural form, the position and working conditions of the joint connection need to be checked, as well as the value of the dynamic coefficient of the component in the hoisting process.The research results provide a new idea for the design of fabricated high-piled wharf, and can provide reference for similar engineering design.

Abstract:This paper investigates the problems in the application and construction of concrete berthing members currently used in the wharf.To meet the design requirements of the fully prefabricated high-pile wharf, this paper proposes a closed steel berthing member, corresponding durability measures, and a structural health monitoring scheme by combining the functions of concrete berthing members and fender aprons.Adopting a sealing structure, this berthing member consists of a face plate, a back plate, and longitudinal and transverse rib plates.Its direct installation on the wharf apron by embedded bolts can overcome the difficulties in the installation and construction of berthing members, raise construction safety, and improve construction efficiency.

Abstract:Regarding the problems such as low degree of standardization, large workload of concrete pouring, multiple ship and machine equipment, and high safety risk of construction crews during the building of high-piled wharf by using routine techniques, this paper combined with the design and construction of multiple wharf projects in Xuwei Port Area of Lianyungang Port.The application technology and effectiveness of prefabricated pile caps, prefabricated beams and modular components technologies used in high-piled wharf structures are studied.The results show that the prefabricated technical proposal for wharf engineering should be determined by combining the natural conditions of the project area, the requirements of berth use, the size of the main structure and the construction capacity, and should be supplemented by the necessary innovative measures of node connection.The application of prefabricated technology in Xuwei Port Area can provide references for similar projects.

Abstract:This paper introduces the characteristics and design method of an integrated precast pile cap and analyzes its structure and connection mode through theoretical analysis and numerical simulation.According to the conclusions, all-vertical-piled wharfs can generally facilitate the installation of the pile cap, and concrete grouting inside the pile can improve the overall lateral stiffness.The structure design of the pile cap can refer to the current structure design code of wharfs.In addition, socketed grouting can connect the pile cap and steel pile, with ultra-high performance concrete as the grouting material, and relevant overseas codes can guide the calculation of the grouting length according to the grip force.In the case of large axial forces, the setting of shear keys in the grouting area can increase the bonding force.

Abstract:In recent years, the cast-in-place concrete retaining walls commonly used in water transport and water conservancy engineering have encountered increasing difficulties in satisfying the demanding requirements of energy saving, environmental protection, and economy of the industry.Meanwhile, the prefabricated revetment structure has gradually attracted attention, but it lacks practical application in water transport and water conservancy engineering.Accordingly, via analyzing a practical example of prefabricated L-shaped retaining walls in a revetment project, the paper summarizes some key and difficult points in the engineering application of prefabricated revetment structures.In addition, it probes into the key technologies in the design and construction, such as engineering construction conditions, revetment structure selection, splitting and connection of members, member fabrication, and lift installation.With these efforts, it formulates a complete set of knowledge on the key technical points of the design and construction of prefabricated L-shaped revetments, proffering references for the application of prefabricated revetments in similar projects.

Abstract:With the development of prefabricated steel structure box-type house construction technology, as well as the upgrading of power supply and distribution system equipment, the structural type of substation has gradually developed from reinforced concrete structure to a diversified one, the steel structure substation also gradually transited from the early traditional box-type to the modular prefabricated substation (E-house).Through the study of the actual application of E-house in the harbor project, it is concluded that the traditional box-type substation has some obvious limitations, such as narrow internal space, which cannot fully meet the space required for equipment operation and maintenance, and the internal wiring form is relatively simple, which leads to the limitation of the transformer capacity.E-house has obvious advantages in customer customization, saving on-site installation and commissioning costs, shortening project construction cycle and so on.It is more suitable for port projects with harsh geographical conditions, limited on-site staffing and tight construction period.

Abstract:In terms of constraint conditions and force characteristics, the connection characteristics of prefabricated double-pile caps and pile foundations are different from those of traditional cast-in-situ pile caps.This paper adopts finite element analysis to compare prefabricated double-pile cap joints and traditional cast-in-situ double-pile cap joints.It also analyzes their differences in structural internal force, concrete stress, structural deformation, and force distribution and summarizes general rules.The results show that the connection between the pile foundation and the prefabricated double-pile cap can be regarded as a solid joint；the concrete in the prefabricated double-pile cap joint will not be destroyed before the pile foundation.The bending moment above the pile body of the prefabricated double-pile cap joint is larger than that of the traditional cast-in-situ pile cap joint, so the bending resistance above the pile top should be calculated.

Abstract:Regarding the problems existing in the design and construction of loading and unloading process of traditional liquid bulk cargo terminal, such as the abstract two-dimensional drawings, errors in equipment and material statistics, short construction period on the jetty, and difficulties to ensure construction quality and safety, the design and application of the prefabricated process module for liquid bulk cargo terminal is proposed.This technology has the characteristics of visualization and accuracy of design model, module prefabrication is not affected by natural conditions, shortening the construction period, improving the quality of process facilities and project economic benefits, which can effectively solve the problems existing in traditional design and construction and provide reference for similar projects.

Abstract:To solve the problems of slow construction speed, difficult construction quality control, high construction safety risk and poor economy in the renovation of the upper structure of traditional liquid dangerous goods dock, the key technologies of modular pipe gallery structure are studied.The structure is applied in the renovation of liquid dangerous goods dock for the first time, and the key technologies such as size control, limit measures, detection and deviation correction measures in the structural design and assembly construction process of modular pipe gallery are extracted, and BIM technology is combined to manage the construction process.The results show that the application of this structure can greatly shorten the construction period, reduce the safety risk during the construction period, improve the quality of the project, greatly reduce the impact on the operation of the built wharf and improve the economic benefits.

Abstract:When the prefabricated beam of high-piled wharf is directly connected with pile foundation, the pile top structure design is the key and difficult point of the technical scheme.It is to ensure that the beam, pile core and pile foundation are connected reliably, meanwhile the pile core structure has enough bearing capacity.Based on an actual project, we put forward a new pile top structure which is suitable for the fully prefabricated beam, and carry out calculation and analysis on it.The results show that the combined capacity of new and old concrete can be improved by using corrugated steel pipe without removal for the mold of reserved cavity of the fully prefabricated beam.It is feasible to use profile steel group instead of steel bar cage in pile core structure.Considering that the bonding force between profile steel and concrete is different from that between steel bar and concrete, the anchoring calculation of the pile core using profile steel in the reserved cavity of the prefabricated beam should be carried out.

Abstract:Cast-in-place upper and lower beams, pile cap joints and precast or cast-in-place beams are commonly used in the superstructure of the traditional high-pile beam-type wharf, which has large concrete pouring volume, many processes and a long construction period.Based on the design example of a Shanghai water viewing platform, an integral prefabricated beam structure with reserved pile foundation holes and embedded support I-beams is proposed, and the cast-in-place pile cap structure is eliminated.The instability problem of the prefabricated beam on pile foundation and the structural safety problem of the prefabricated beam during construction are solved, and the direct connection between the prefabricated beam and the pile foundation structure is realized.While ensuring the integrity of the structure, the precast assembly rate of the superstructure is improved, and the amount of concrete poured on site is greatly reduced, the construction is environmentally friendly and the construction period is shorter, which can provide reference for similar projects.

Abstract:The traditional high-pile beam-slab wharf has many design shortcomings, such as a large number of prefabricated members, large transportation volume, a tremendous amount of formwork and welding work on the construction site, and few construction gaps.To overcome them, this study adopts a standardized fully prefabricated wharf structure with large members and few joints, taking a liquid bulk cargo berth in the Port of Lianyungang as an example.Considering the installation conditions during the construction period, it adopts the three-point support layout for pile foundations and divides the superstructure into three standard modular prefabricated members according to their functions, namely, prefabricated beams and front and rear prefabricated π-shaped plates.As a result, it achieves the fully prefabricated wharf structure design by key joint connection technologies such as a new steel-structured pile core at the joint between pile foundations and prefabricated beams and the steel sleeve connection between prefabricated beams and prefabricated π-shaped plates.Additionally, this paper proposes the synchronous equipment of a complete set of design technologies such as ancillary facilities and monitoring schemes, which can provide a reference for the promotion and application of fully prefabricated wharf in various functional berths.

Abstract:Traditional high-piled wharfs confronts many problems, such as a low prefabricated rate, low standardization, large on-site and aquatic concrete pouring workload, many ship engines and construction personnel, narrow working face, and high safety risks.Considering these problems, this study proposes a fully prefabricated high-piled wharf following the overall design concept of large members and a high prefabricated rate through massive theoretical research and tests and successfully applies it to a wharf in the Port of Lianyungang.Taking the fully assembled high-piled wharf as an example, this paper introduces the general design scheme of the plane layout by analogy with the traditional high-piled wharf.The results show that the fully prefabricated high-piled wharf adopts the modular prefabricated mode and follows the principle of standardization, large members, and few nodes, featuring a short construction period, high efficiency, good economy, and low carbon emissions.

Abstract:This study takes the first fully prefabricated high-pile wharf in China as the research object to compare the economy of the fully prefabricated high-pile wharf with that of the traditional high-pile wharf.Specifically, it analyzes the engineering cost composition of the fully prefabricated wharf platform by calculating the concrete consumption and the prefabrication rate of each part of the two wharf platforms.Then, it compares them in the direct construction cost, the financial cost of construction, and other aspects.The results show that the fully prefabricated wharf is more economical than the traditional one in the above-mentioned aspects, which can provide a basis for promoting fully prefabricated high-pile wharfs.

Abstract:The simply supported beam structure has the advantage of rapid assembly, but it is seldom used in prefabricated high-piled wharf due to the lack of research on its horizontal force transmission performance.This paper analyzes the displacement distribution law of wharf structure subjected to horizontal concentrated force through the comparison of finite element model calculation.The results show that the full simply supported beam system has little effect on the weakening of horizontal force transfer performance of wharf structure, and can effectively transfer horizontal force under the condition of continuous surface layer, which is a feasible prefabricated technical scheme.For the piled wharf structure with full simply supported beam system, the horizontal force distribution coefficient should be appropriately increased on the basis of standard regulations in?Design Code for Wharf Structure.

Abstract:In a channel widening project, a new type of prefabricated gantry revetment structure was adopted.Aiming at the working condition of the structure under the vertical load on the shore, a model loading test based on the transparent soil PIV （particle image velocimetry）analysis technology is carried out.Through the whole dynamic observation method, the working mechanism and soil response characteristics of the new structure are revealed, which provided a basis for engineering design, and computing to provide technical support.The test results show that the working mechanism of the prefabricated bank revetment structure under the action of vertical load is relatively complicated.First of all, due to the existence of the connecting beam, the sheet pile and the square pile form a relatively stable spatial structural system, which can deform together to produce a coordinated effect, effectively to limit the horizontal displacement of the structure.Secondly, in engineering design, in order to give full play to the performance of each component of the front sheet pile and the rear pile portal structure, the matching of the flexural section modulus of the sheet pile and the square pile is very important.The amount should be larger.Finally, the bending moment, displacement and deformation of the sheet pile and square pile in the test are basically consistent with the calculation results of the engineering design using the?m?method, which verifies that the?m?method is suitable for the design and calculation of the structure, but attention should be paid to the value of?m.Otherwise, the result will be greatly affected.

Abstract:In view of the current problems such as the initial application of prefabricated pile foundations type revetment structure in the water transport engineering and the lack of design methods, this paper comprehensively and systematically summarizes and introduces the structure from the aspects of structure selection, component splitting, connection design, pile foundation, calculation method, etc., expounds the applicable conditions, structural analysis methods and structural design key points of the prefabricated pile foundation by comparing with the cast-in-place concrete revetment structure, so as to facilitate engineers to better understand its design concepts and methods.

Abstract:Regarding the problem that the deficiency of resilience against wave action in the traditional revetment structures design of water transportation engineering, the basic characteristics of the force transmission mechanisms of the revetment structures and the comparative study of its combination mechanism are carried out.Classical revetment structures with the combined force transmission mechanisms are analyzed systematically, and the eleven combined force transmission mechanisms are formulated.The reinforced effects of the resilience are verified via the combined force transmission mechanism using the engineering application.

Abstract:To ensure the navigation of yachts and water exchange in coastal areas, it is often necessary to build new locks or set up navigable structures such as navigable holes.With the intensification of marine ecological and environmental protection in recent years, the use of sea indicators has become more and more tense, and the traditional construction technology of large cofferdams on dry land is increasingly unable to adapt to the new situation.For this reason, this paper combines the basic engineering of Lianyun New City, and conducts research on key technologies such as structure selection, water and seepage prevention in view of the complex situations such as limited sea use, harsh natural conditions, riprap foundations and tight construction periods, and the design technology of prefabricated gate chamber and prefabricated wing wall are proposed, which can solve the relevant technical problems well and provide references for the design and construction of related projects.

Abstract:In view of the complex conditions of deep soft soil foundation and loading effect, this paper analyzes the stability and deformation of a prefabricated steel cylinder revetment structure.Firstly, the paper determines a reasonable structural scheme and analyzes the overall stability of the revetment through the slice method.Secondly, the paper adopts a numerical simulation method to study the deformation characteristics of the steel cylinder under loading effects.Finally, the paper verifies the reliability of the prefabricated steel cylinder revetment by a centrifuge model test.The results show that under the condition of a deep soft soil foundation, the deep sliding surface under loading effects can be truncated by a deeply inserted steel cylinder to ensure the overall stability of the revetment.The top displacement of the steel cylinder is about 10 cm, and the cylinder tilts to the seaside by 0.09° when the loading effect is 120 m away from the revetment axis.By controlling loading distance, the deformation of the steel cylinder under loading effects has a slight influence on the structure of important buildings, which provides theoretical support for constructing steel cylinder revetments.

Abstract:Traditional revetment has a strong function but weak ecology, and the material and energy exchange before and after revetment is blocked, so it is difficult to meet the needs of green and ecological channel construction in the new era.In view of this problem, this paper takes the channel regulation project of Youdun Port in Shanghai as an example and analyzes the construction conditions, engineering characteristics, and ecological revetment concept.In addition, the paper puts forward a respiration-type prefabricated ecological revetment structure and summarizes technologies such as ecology design, hydrophilicity design, and joint connection design, as well as calculation method, so as to provide a reference for the construction of a faster and better green channel.

Abstract:Regarding the problem of slow efficiency of welding and mechanical connection for steel bar connection in wharf engineering, this paper studies the connection technology of grouting straight thread sleeve steel bar, and compares the failure strength of the anchorage system with different sleeve length by indoor tensile fest.The results show that the ratio of sleeve length to the diameter of the reinforcement is 8 or more, and the stress of the reinforcement can reach over 360 MPa when the anchorage system fails.The sleeve design can be determined according to the design tension of reinforcement and the shear strength of grouting material.Through the engineering inspection, the straight thread sleeve grouting technology can meet the engineering requirements, provide high steel bar connection efficiency, and reduce environmental pollution during construction.This technology can provide ideas for green construction.

Abstract:Conventional protruding bars cannot connect the integral prefabricated beam and pile cap of a high-piled wharf.In view of this problem, this paper proposes a replacement method using section steel and post-grouting of reserved holes in the beam based on an actual project.The paper uses the numerical analysis method to calculate the internal force of the structure and the stress of the material.The results show that the core of the technical scheme of the section steel replacement method lies in the equivalent design for steel content and its inertia moment.In addition, the feasibility of the technical scheme is verified.

Abstract:In the existing high-piled wharf, the pile cap or beam connected to the pile foundation generally adopts the cast-in-place process.Based on the wharf project in Xuwei Port area of Lianyungang Port, this paper adopts a superstructure with a slot-type prefabricated component connected with the pile foundation.The pile-core embedded steel is inserted into the built-in cavity of the component and connected with the pile foundation through the post-pouring cavity node.The slot-type component is a new structure, so this paper analyzes its prefabricated construction process and develops a mold disassembly-free chiseling construction process.The results show that this process can solve the technical problems of mold supporting and disassembling in the cavity, improve the prefabricated efficiency and quality of the new structure, and provide a reference for similar projects in the future.

Abstract:Because the cast-in-place beams of the traditional high-piled wharf have many hidden dangers in the construction of water operations, the construction quality is greatly affected by the level of the construction team and the offshore wind and waves, and the construction efficiency is low, the paper studies the key construction technology of the integration of large-volume beam-assembled formwork and steel cages, proposes to model and produce the template by TEKLA software, produce the steel cages in a professional prefabricated yard, and transport them to hoist on site.The results show that the integrated technology of prefabricated beam can save the construction cost, improve the overall quality of the beam, effectively shorten the project construction period, and improve the operation safety.

Abstract:The main body of the new fully prefabricated high-piled wharf structure adopts modular design and is composed of new prefabricated components such as slot beam, bottomless π beam, the structure is novel, the components have large size and weight, high difficulty in installation and positioning, there is no precedent for construction.Taking the wharf engineering in Xuwei Port area of Lianyungang Port as an example, this paper analyzes the application advantages of the new high-piled wharf structure, and proposes technical measures such as new component prefabrication, precise positioning and installation, cavity node construction to solve the construction difficulties of the new wharf structure.The engineering practice is proved that the construction technical measures are advanced, safe and efficient, which can provide references for similar projects.

Abstract:The thin-walled frame structure without a bottom plate of π-shape beam plate for a new prefabricated high-piled wharf faces high temperatures in box rooms and difficult inner mold removal during the prefabrication process.In order to solve these problems, this paper analyzes the prefabrication process of the frame structure without a bottom plate and introduces the split-type hydraulic telescopic automatic demolding process and the electric steam curing process.The results show that the automatic demolding process solves the problem that manual work cannot be carried out due to the high temperature in the inner cavity after concrete pouring of the π-shape beam plate.The electric steam curing process can compress the age required for lifting components, save the amount of formwork, and improve the prefabrication efficiency.

Abstract:Slot-type beam is a new structure with built-in cavities, and it is different from the upper prefabricated components such as the longitudinal beam of the high-piled wharf in terms of installation.In addition, it has no lower component to serve as the bearing surface and requires the pile foundation to be inserted into built-in cavities of the component.The slot-type beam has not been used in projects, and its installation is difficult.In view of the installation process of slot-type components, this paper develops a component installation operation platform and an integrated precise positioning device and studies the installation methods of different crane ships.In addition, the practical application of the first fully prefabricated high-piled wharf in China achieves excellent results and can provide a reference for similar projects.

Abstract:This paper takes a typical oversize shore-connecting approach bridge in an open-sea area as an example to compare the technologies and economics of lower pier structure schemes.This study considers many problems of this approach bridge, including its large construction scale, complex geological conditions, a high proportion of the lower pier structure in the engineering investment, poor wind and wave conditions, short working time, and difficult control over the construction period.The comparison indicates that the high-pile pier structure is better in the application.Moreover, according to the characteristics of a large number of engineering piers and high standardization of scale, the paper proposes an optimal design scheme for prefabricated piers.The results show that the application of the structure greatly reduces the amount of concrete pouring on site, and the structure provides a favorable guarantee for reducing the construction difficulty and safety risks during construction and ensuring the construction period.The research can provide a reference for the design of similar offshore hydraulic buildings.

Abstract:The design criteria of escape passages at dangerous goods wharfs are ambiguous in the prevailing specifications, and the locations of escape passages in existing projects are unreasonable and fail to ensure the safe and rapid escape of people in emergencies.Considering these problems, this study investigates the stress characteristics of the steel-reinforced concrete structure and its adaptability in offshore engineering structure design.As a result, it introduces a structure for water escape passages on the basis of the prefabricated steel-reinforced concrete structure and applies it in the design of the wharf structure.Furthermore, by summarizing the features of this structure, the paper also put forward countermeasures to tackle the major difficulties.The results show that the structure can remove the obstacles in the setting space and construction water level of water escape passages, featuring controllable quality, convenient installation, and assured safety and reliability.Hence, it is a supplement and alternative to the design of water escape passages at wharfs and is conducive to enriching the safety facilities of offshore wharfs.

Abstract:Digital delivery is an important foundation for the implementation of digital integrated construction technology for prefabricated pile foundation wharf.Based on a prefabricated wharf project, this paper puts forward the architecture design scheme of the digital delivery platform of the prefabricated terminal from the value requirements and content requirements of the digital delivery of the prefabricated terminal, and gives the technical implementation scheme suggestions for the digital coding rules, data integration and release and data security of prefabricated components according to the characteristics of the whole life cycle construction of the prefabricated wharf.Examples of application scenarios are given around the functional requirements of BIM and various engineering documents, cloud problem communication and closed-loop solution, file sharing and archiving, etc.The digital delivery of all parties involved in the construction of prefabricated wharfs throughout the life cycle is realized.

Abstract:As one of the most widely used wharf structures in current, high-piled beam-slab wharf has many problems in design and construction, such as complex structure, large volume, long construction period and so on. The research on the integration of design and calculation based on BIM technology is carried out for the prefabricated high-piled wharf.A set of digital design plug-ins for the prefabricated high-piled wharf is developed by the Autodesk Revit API interface to realize the rapid design and modeling of the prefabricated high-piled wharf structure in the Revit platform.Also, the interactive technology between Revit platform and Robot Structural Analysis calculation software is used to import the wharf structure model into Robot software for structural calculation, so as to realize the integrated process of design and calculation of prefabricated high-piled wharf.This technology can improve the design quality and efficiency, and enhance the wharf prefabricated technology.

Abstract:Because of a lack of intelligent system infrastructure during the design and construction of prefabricated high-piled wharf, this paper studies the setting of intelligent system infrastructure of prefabricated high-piled wharf.The paper summarizes the requirements of prefabricated high-piled wharf intelligent system infrastructure, analogies the setting principles of prefabricated intelligent building system, and summarizes the principles of separation of prefabricated and embedded and integrated collaborative design through project case analysis.The paper puts forward the design principles and key points of the intelligent system infrastructure of prefabricated high-piled wharf, improves the design level and construction quality of the intelligent system of prefabricated high-piled wharf, and promotes the development of the all-professional integration technology of prefabricated high-piled wharf.

Abstract:We introduce a production and management method of prefabricated components of prefabricated pile foundation wharf based on digital processing.Combining BIM technology and digital production, we transmit the BIM detailed design information of the entire component to the prefabrication production stage of the component through digital means, and integrate RFID technology, BIM, and component management system based on the internet of things and the internet.The technology can achieve digitalization, informatized and visualized manufacturing and processing management of prefabricated pile foundation wharf components, and ensure accurate, timely and effective information transmission of prefabricated components throughout the project life cycle.