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On the construction scheme and precautions of yacht water wharf

On the construction scheme and precautions of yacht water wharf on the construction scheme and precautions of yacht water wharf

Preparation before construction

4.1.1 read and check the design drawings and relevant basic data comprehensively and carefully, be familiar with the size and relationship of each component, and communicate with the design unit in time in case of any doubt, and conduct supplementary investigation if necessary.



4.1.2 conduct pre setting out for all upper and lower structural members according to the design drawings. If errors, contradictions or differences with the actual situation are found, contact the design unit in time to find out the causes.



(1) Recheck the coordinates of control points, including pile position coordinates, pier center coordinates, bridge deck sideline control point coordinates, etc.



(2) Recheck the elevation of control points, including pile top elevation, bearing platform top elevation, column top elevation, floating yard top elevation and bridge deck elevation.



① Special construction schemes, such as the construction technology of deep foundation pit, can be implemented only after special review.



② The construction scheme shall be submitted to relevant departments for approval before implementation.



③ For the pipelines that affect the project construction, it is necessary to communicate and coordinate with the affiliated management and maintenance unit to formulate a practical pipeline relocation or protection scheme.



4.2 construction sequence and specifications

4.2.1 construction sequence



Construction preparation → construction of retaining wall → dredging and backfilling → piling (pine pile and steel pipe pile) → installation of Floating Wharf → installation of lamp pile



4.2.1.1 construction of retaining wall



(1) Construction sequence



Construction preparation → surveying, setting out and elevation setting → strip foundation concrete (there are backfill parts) → trial placement of brick samples → masonry of retaining wall → fabrication and binding of coping reinforcement → woodworking coping and formwork erection → concrete pouring



(2) Retaining wall design



① The retaining wall works are 100m long, 5.65m high vertically and 4.1m wide horizontally. The foundation and wall body of the retaining wall are made of mu20 rubble with M5 cement mortar, capped with C30 concrete, and the surface is roughened. The retaining wall is provided with a settlement joint every 10m, with a width of 1cm. The joint is filled with asphalt hemp yarn inside, outside and top. The wall body is embedded with hard plastic pipes at 700mm, 1200mm and 1750 under the top of the cushion cap Φ 50@2000 The wall back is backfilled with 300mm thick gravel filter layer with particle size of 50 ~ 80mm.



② The retaining wall is 500mm thick, and reinforced concrete coping is set at the top, with a height of 200 Φ 20 mm reinforcement, distribution reinforcement is Φ 8mm@150 。



③ M10 cement mortar and C40 foundation and capping concrete are used.




4.2.1.2 dredging and backfilling



Technical measures for construction quality assurance of desilting and backfilling Engineering



project



content



measures



clear



Silt



amount



control



Construction process



(1) before desilting construction, the established grid map of the general desilting construction area and the desilting grid map of each section shall be disclosed to the construction personnel in detail. The construction personnel must indicate the location of the completed area on the grid map at any time, and make detailed construction records on the grid map to facilitate the handover of each operation shift to prevent missing excavation and repeated construction.



(2) the soil of the desilting part of the project is relatively soft, the distance between the lower buckets shall be appropriately increased, and the overlapping range of the grab shall be increased. The forward moving distance shall be 0.6 ~ 0.7 times of the opening width of the grab.



(3) the thickness of dredging layer is not easy to be too thick.



(4) the desilting of foundation trench shall be controlled by both elevation and soil according to the design requirements. The excavation bottom width of foundation trench shall not be less than the design bottom width, and the slope shall not be steeper than the design requirements.



(5) over excavation shall be strictly controlled during desilting construction. The average over depth shall be less than 0.5m. The excavated slope shall not be steeper than the design slope, and the over width of each side shall not be greater than 1.0m.



(6) when the foundation trench is excavated to the design elevation, the soil data shall be checked, and samples shall be taken and submitted to the supervision engineer; The soil sample analysis must meet the requirements. When the soil quality is inconsistent with the design, the design unit must be notified, and whether to continue the excavation shall be decided according to the instructions of the supervising engineer.



(7) desilting acceptance shall be carried out together with the supervision unit and the design unit, and double control shall be adopted according to the design requirements, that is, to detect the section size and verify the soil quality.



(8) the survey ship equipped with GPS positioning system and multi beam sounding system is used for survey, and software is used to realize high-precision data synchronization, and the survey map is automatically drawn on the computer.



(9) make construction records, measure the original mud surface before construction, measure the process at least once a week during construction, and submit the results to the supervising engineer for inspection. The completion survey shall be requested according to the requirements of the supervising engineer, and the as built water depth map and the as built section map of the foundation trench required by the supervising engineer shall be submitted within the agreed time.



Back silting treatment measures



(1) before riprap, the diver shall measure and explore, and the riprap construction of subgrade bed shall be carried out after meeting the specification requirements.



(2) the construction time of foundation bed leveling shall be reasonably selected. The foundation bed shall be leveled a few days before the caisson is hauled. After the leveling is completed and accepted, the caisson shall be installed immediately. If back siltation occurs at the top of the subgrade bed, the air lift sand pumping pipe shall be used for dredging.



4.2.1.3 piling



(1) Loosening stake



① Construction technology

Surveying and setting out → excavation and filling of working face → setting out of pile position → loosening of wood pile → sawing and leveling of pile head → construction of rubble Embedded Pile and C15 concrete cushion → construction of bearing platform




(2) Driving steel pipe pile



① Adopt φ 529 * 12 * 18000 steel pipe pile fixing



A. The advantage of using pile column fixation is that the offset space of the wharf is small, and the position of the wharf is not affected by the tide. The disadvantage is that in areas with large tidal range, the pile will appear very high when the tide recedes, which hinders the line of sight of the sea view and affects the beauty of the yacht port.



B. The elevation of the top of the positioning pile shall not be lower than 1.0m above the extreme high water level.



C. Conical pile cap shall be set on the top of positioning pile.



D. The steel pipe pile shall be subject to anti-corrosion treatment and the pile top shall be closed.



E. The pile holder shall be equipped with sliding block or guide roller. The gap between the sliding block or guide roller and the positioning pile should be 10 ~ 30mm. When the water level difference is large, it should be increased appropriately.



② Operation process



A. Process flow:



Place the pile driver → lift the steel pipe pile → stabilize the pile → pile driving → pile extension → pile delivery → intermediate inspection and acceptance → move the pile driver to the next pile position





Guangzhou hengqiao Offshore Engineering Co., Ltd. is a company specializing in water yacht wharf, sailing wharf, rowing wharf, traffic pontoon, landscape platform, Landscape Arch Bridge, and other water projects. It can provide customers with professional services such as project consultation, project quotation, piling, design, manufacturing, engineering installation, maintenance, upgrading and transformation. The company's main technicians have more than ten years of professional work experience, water floating wharf project, professional processing and construction of water steel and aluminum structure, water conservancy civil engineering, etc., and can provide a series of services for yacht wharf, landscape floating bridge and water engineering! Hengqiao offshore engineering has established the company's quality management system, and its products have passed iso9001-2015 quality management system certification and ISO14001-2004 environmental management system certification. Comply with the industry norms and standards of Europe, America and other countries. And export product quality certification, long-term cooperative relations with many well-known

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