61 results about "Dry dock" patented technology

The present application relates to a semi-prefabricated construction method for large deep-water caissons in a shallow dock. Concrete for a caisson base slab is poured in a dry dock, prefabricated slabs and steel trusses are mounted around the base slab to form an open box structure, then a box is towed to a bridge site, the construction of the caissons is completed by means of cast-in-place concrete pouring on the water, and finally the caisson is filled with water and sinks into place. The present application can greatly reduce the requirements for the excavation depth of the dry dock, and decrease the dredging workload of an undocking and floating channel, thereby reducing construction costs, and also facilitating shortening the construction period of the caissons.

The present invention provides a novel offshore structure, referred to as Super Shallow Water Structures (SSS), designed and manufactured for installation in shallow water depths ranging from 3.5 meters to 50 meters. The said structure is a self-floating structure that can be towed from a fabrication yard or dry dock to an offshore site and lowered into position without requiring heavy lifting vessels or barge-based operations. The structure is equipped with a unique pontoon foundation (1) that facilitates self-floating transport and lowering through controlled water or grout filling. The structure (SSS) serves as an alternative to traditional offshore structures. It also provides a viable solution for replacing jacket and pile foundations for heavy topsides structures.

The invention belongs to the technical field of immersed tunnel engineering, and particularly relates to a soft stratum immersed tunnel dry dock foundation pit anchor cable force prediction method and system, and the method comprises the following steps: S1, collecting related data of a dry dock soft stratum, an anchor cable and a water pumping and storage circulation effect; s2, deriving a creep model of the soft stratum based on a nonlinear generalized Kelvin body model; s3, simulating and establishing an axial force relaxation model of the anchor cable according to the coupling effect of the anchor cable and the soft stratum; s4, an anchor cable axial force evolution calculation equation is constructed according to anchor cable axial force changes under the in-dock water pumping and storage circulation effect; and S5, fitting and optimizing an inherent coefficient in the axial force relaxation model according to the monitoring data of the test. An anchor cable axial force curve in the water pumping and storage disturbance process is established through anchor cable axial force changes under the water pumping and storage circulation effect, and the actual stress condition of the anchor cable is reflected more truly; and fitting and optimizing an inherent coefficient in the axial force relaxation model through monitoring data under the water pumping and storage circulation effect.

The invention relates to the technical field of dock and immersed tube dry dock building, in particular to a dock gate structure, a dock gate system and a dock gate mounting method.The dock gate structure comprises a dock gate which is of a grillage structure; the supporting frame is used for supporting one side of the dock gate through a plurality of jacks, and the supporting frame can be detachably separated from the dock gate. According to the dock gate structure, the support frame which is detachably connected is arranged on one side of the dock gate to provide external support for the dock gate and share partial stress, so that the dock gate can be designed into a lighter grillage structure, and the volume of the dock gate is greatly reduced. After being prefabricated, the dock gate can be in a flat state on the water surface to be hauled, and due to the fact that the size and draught are greatly reduced, the requirement for the channel depth is reduced. After being hauled to the site, the device is assembled with the supporting frame for use, so that the overwater operation processes such as floating transportation and installation are simpler, more convenient and more efficient, and the engineering construction efficiency is greatly improved.

To provide a mobile dock capable of realizing a dry dock regardless of environments.SOLUTION: A mobile dock comprises a floating body unit extending in the horizontal direction, a side wall part rising from the floating body unit and also forming a dock space on a floating body, capable of accommodating a ship, an opening / closing part movable between the opening position to open the dock space horizontally and the closing position to block / close the dock space horizontally, and a drainage part capable of draining the water in the dock space outside the dock space. As a result, the inside of the dock space can be used as a dry dock.SELECTED DRAWING: Figure 1

A long-distance underwater transportation method for immersed tubes, the steps of which are as follows: S1. After the prefabrication of the immersed tube segments is completed, preparations before launching are carried out; S2. Water is injected into the dry dock, and the immersed tube floats under the action of buoyancy to complete the launching of the immersed tube from the dock; S3. The towing barge tows the immersed tube and floats it along the waterway in the shallow sea area; S4. After the towing barge tows the immersed tube into the deep sea area, the immersed tube is towed to the installation position; S5. Before the immersed tube enters the installation position, the immersed tube floats up, and after floating up, the freeboard height is adjusted and the towing cable is adjusted; S6. The towing barge tows the immersed tube and floats it along the waterway to the designated installation position, and after basic positioning, mooring is carried out. By submerging the immersed tube segments for underwater transportation, the present invention avoids the damage to the structure caused by the extreme deep-sea environmental loads during the transportation process, realizes the long-distance transportation of the immersed tube across the deep sea area, and the present invention realizes the reuse of the existing immersed tube tunnel prefabrication factory, saving the investment in new projects and the construction period of the prefabrication yard.

This invention relates to the technical field of construction engineering, and in particular to a prefabrication and installation method for a dry dock entrance, comprising the following steps: Step A, construction of an underground anti-seepage wall in the dry dock entrance area, layered and segmented construction of the dry dock entrance concrete, one-time pouring of concrete for the lower part of the dock sill and one-time pouring of concrete for the main body of the dock pier; Step B, design and prefabrication of dock sill stones and prefabricated dock pier stones; Step C, installation of the prefabricated dock sill stones and prefabricated dock pier stones. This invention features prefabricated dock sill stones and dock pier stones used in the construction of the dry dock entrance. The layered and segmented pouring method during construction effectively controls temperature cracks in the main concrete of the dry dock entrance; the stainless steel panels inlaid on the contact surfaces of the prefabricated dock sill stones and prefabricated dock pier stones with the dock gate greatly improve the flatness of the sealing surface; furthermore, the prefabricated structure effectively simplifies the construction process and reduces construction costs.

This invention discloses a method for ship cutting and water-based docking, comprising the following steps: marking a cutting baseline on the hull to be modified in a dry dock; cutting the hull according to the cutting baseline and inspecting the cutting quality of the hull; pre-cutting the intermediate half of the hull and inspecting the pre-cut parts; simulating the joining of the cut hull and the intermediate half; marking joining reference marks on the cut hull and the intermediate half based on the joining reference marks; adjusting the buoyancy of the bow half and the intermediate half after cutting based on the joining reference marks; controlling the intermediate half's support on the corresponding support in the dry dock after adjusting the buoyancy of the bow half and the intermediate half; and controlling the bow half's support on the corresponding support in the dry dock after the intermediate half has been controlled. This invention improves the control level of ship cutting and joining, shortens the joining construction time, and improves efficiency.

This invention relates to a graded trigger-type crash barrier and crash prevention method for dry dock boarding ramps, belonging to the technical field of dry dock boarding ramps. The crash barrier includes uprights and crossbeams. A crash prevention structure is installed on the crossbeams, comprising: a mounting plate with a locking part on the back for locking onto the crossbeam; an outer airbag connected to the front of the mounting plate, which is inflated under normal conditions to form a first-level crash buffer; an inner airbag connected to the front of the mounting plate and located inside the outer airbag, which is deflated under normal conditions; and a high-pressure gas cylinder installed at the locking part, which is connected to the inner airbag via a pipeline. A pressure switch is installed on the pipeline, and the pressure detection end of the pressure switch is located inside the outer airbag. When the outer airbag is impacted and the internal pressure rises to the trigger threshold of the pressure switch, the pressure switch opens the pipeline, and the high-pressure gas cylinder inflates the inner airbag, causing the inner airbag to expand and form a second-level crash buffer.

The invention relates to the technical field of dry dock water stopping, in particular to a two-way water stopping structure, a dock entrance water stopping system and a using method. The second vertical grooves are formed in the two ends of the dock gate, and the second vertical grooves and the first vertical grooves are oppositely arranged; and the water stop gate is located between the first vertical groove and the second vertical groove, and the water stop gate is used for abutting against the side wall of the first vertical groove and the side wall of the second vertical groove. The dock gate and the docking block can be subjected to water stopping when water is dry in the dock and water is stored in the dock, the two-way water stopping effect is achieved, compared with a traditional mode that four water stopping steel gates need to be arranged, only two water stopping gates need to be arranged, the number of water stopping parts is reduced, the operation process is simplified, and the construction operation efficiency is improved.

The invention provides a reciprocating type folding and unfolding system and method applied to opening and closing of a dry dock gate. The system comprises a propelling device which comprises a telescopic arm and a first driving mechanism, a dock gate connecting hook is arranged at the front end of the telescopic arm, and the first driving mechanism is used for driving the telescopic arm to stretch out and draw back so that the dock gate connecting hook can get close to or away from a dry dock gate; the rotary system comprises a second driving mechanism and a fixed support, the telescopic arm is rotationally connected to the fixed support, the second driving mechanism is connected with the telescopic arm and used for driving the telescopic arm to drive the dock gate connecting hook to rotate, the dock gate connecting hook is connected with the dry dock gate, and then longitudinal movement of the dry dock gate is achieved through the propelling device; the transverse moving device is installed on the in-dock wharf, fixedly connected with the dry dock gate and used for achieving transverse movement of the dry dock gate. By means of the cooperation of the propelling device, the rotating system and the transverse moving device, high-stability and high-efficiency opening and closing and retracting operation is achieved, and the safety and stability of the opening and closing and retracting operation of the dry dock gate can be improved.

The utility model relates to an integral prefabricated dry dock, which belongs to the technical field of dry docks and comprises a dock wall, a bottom plate, a dock gate and a plurality of lifting points. The dock wall is of a surrounding structure, one side of the dock wall is provided with a dock entrance for communicating a space surrounded by the dock wall with an external space, and a plurality of first cabin grids are arranged in the dock wall; the bottom plate comprises a bottom plate main body, the bottom plate main body is connected to the bottom of the dock wall and prefabricated with the dock wall into a whole, and a plurality of second cabin grids are formed in the bottom plate main body; the dock gate is mounted at the dock entrance to open or close the dock entrance; the lifting point is arranged at the top of the dock wall. The integral prefabricated dry dock can be integrally transported and installed so as to meet the requirement for quickly building the dry dock in an open sea island.

The application discloses a digital half-ship closing control system, which comprises a dry dock support system, a data acquisition module and a central control system, the data acquisition module is in electrical connection with the central control system through a communication network; the central control system comprises a data input module, a data processing and analysis module and an output module; the data input module is used for receiving real-time data collected by the data acquisition module; the data processing and analysis module is used for calculating deformation error and stress distribution of a half-ship and generating adjustment instructions based on the calculation results; and the output module is used for outputting the adjustment instructions to the dry dock support system and transmitting adjusted data to the data input module. The digital half-ship closing control system and the closing method realize real-time monitoring, dynamic feedback and automatic adjustment of a closing process.

The present invention relates to a repair device and method for anti-floating bolts of a steel template for a submerged tube. The repair device comprises a first sleeve, which is located on one side of the original sleeve of the dry dock along the longitudinal direction of the steel template for a submerged tube, is vertically arranged, is connected to the original sleeve, and is located on the same straight line in the longitudinal direction of the steel template for a submerged tube with the original sleeve. The first sleeve is used to vertically connect the second sleeve on the steel template for a submerged tube through a screw to form anti-floating of the steel template for a submerged tube. The second sleeve at the upper end of the anti-floating bolt is adjusted in the longitudinal direction of the steel template for a submerged tube, so that the first sleeve can replace the original sleeve and connect with the adjusted second sleeve, thereby forming anti-floating of the steel template for a submerged tube, and the repaired anti-floating bolt can still be repeatedly disassembled and assembled through the threaded connection between the screw and the first sleeve. The dry dock does not need to be excavated to re-embed the sleeve at the lower end of the screw, and the structure is simple, the cost is low, and the construction is more convenient, and the quality of the dry dock will not be affected.

The present application relates to the technical field of immersed tube tunnel, and particularly relates to a large-scale immersed tube in-dock turning method, which comprises the following steps: S1: water is poured into a dry dock to make a large-scale immersed tube float up, and a large-scale immersed tube is subjected to a cable operation; S2: the large-scale immersed tube is subjected to a first transverse movement to move from a shallow dock area to a deep dock area turning position; S3: the large-scale immersed tube is subjected to turning and movement at multiple different point positions in the deep dock area, and is subjected to cable adding, cable changing and cable releasing to complete a turning operation of the large-scale immersed tube; and S4: the large-scale immersed tube is subjected to transverse movement to a dock-out axis after turning. Through the turning operation at multiple different point positions in the deep dock area, the turning of the large-scale immersed tube in the deep dock area is completed without the need of expanding the deep dock area, and the problem that a large-scale immersed tube is extremely difficult to turn in a dock due to the fact that a conventional dry dock does not reserve enough space for the large-scale immersed tube to turn in the dock during construction design is solved.

The application discloses a ship undocking control device and method based on digital twinning, equipment and medium, and belongs to the field of ship launching, towing out or entering a dry dock. The device comprises a digital twinning image construction module, which is used for acquiring a dock model and constructing a digital twinning image of the dock according to the dock model; a water level data acquisition module, which is used for acquiring water level data in the dock through a sensor during the process of water filling or water draining of the dock; and a dynamic digital twinning effect drawing generation module, which is used for combining the water level data into the digital twinning image to obtain a dynamic digital twinning effect drawing in the process of water filling or water draining and displaying the dynamic digital twinning effect drawing. According to the technical scheme, the dynamic digital twinning effect drawing can be made according to the real-time water level in the dock, the process of water filling or water draining of the dock can be observed in real time through the displayed dynamic digital twinning effect drawing, the process of water filling or water draining of the dock is more directly displayed, and the control efficiency of the ship entering or leaving the dock is improved.

The present invention discloses a rust removal device for ship bottom repair in a ship dock, comprising a device body, a water storage tank being arranged inside the device body, and two groups of electrically controlled water pumps being arranged inside the device body, the water inlet ends of the electrically controlled water pumps being communicated with the water storage tank, the water outlet ends of one group of the electrically controlled water pumps being connected to a connecting pipe, the end of the connecting pipe being connected to a second water spray plate, and the water outlet ends of the other group of the electrically controlled water pumps being connected to a diversion pipe, the diversion pipe comprising two water outlet ends, one of the water outlet ends being connected to a cleaning ball, the surface of the cleaning ball being provided with a plurality of first water spray holes, and the other water outlet end being connected to the first water spray plate; the present invention provides an automatically movable high-pressure flushing structure by arranging the first water spray plate, the second water spray plate, the cleaning ball and a matching auxiliary structure, which is more efficient than a manual cleaning method.

The invention provides a bonding method and tool for a sealing ring of a sealing device and application, and relates to the field of structural sealing, and the bonding method comprises the following steps that S1, a bonding surface is pretreated; s2, assembling a tool; s3, a heating sealing ring assembly is installed; s4, a sealing ring is fixed; s5, a sealing ring is pressed in and fixed; and S6, carrying out heat vulcanization bonding. Two groups of clamping plates and two groups of heating plates are fixed on the bottom plate, and heating holes and detection holes are formed in the heating plates. The bonding tool and method for the sealing device sealing ring are applied to bonding of a ship stern shaft sealing device, the stern shaft sealing ring can be accurately positioned and installed under the condition that no ship accessories are disassembled, operation can be conducted under the condition that a ship berths and does not enter a dock, huge cost can be saved, and the bonding tool and method are economical and practical. According to the method, the bonding efficiency and reliability are greatly improved, and the overall maintainability of the stern shaft sealing device is improved.

The application provides a cofferdam type construction structure of a conical prefabricated caisson foundation and a construction method thereof. The conical prefabricated caisson foundation comprises a conical bottom caisson constructed in a dry dock, and a conical side wall coaxially arranged in a central region and constructed in a wet dock. A water stop connecting member is arranged on the top of the conical bottom caisson and surrounds the periphery of the conical side wall. A cofferdam main body is arranged on the top of the water stop connecting member, and the cofferdam main body comprises a bottom initial section which is installed in the dry dock. By using the construction scheme of sitting on the bottom and increasing the height in the wet dock, the safety risks of overturning, failure of mooring system and damage of facilities during the construction of the traditional floating pouring method in the typhoon period are fundamentally solved, and the stability and safety of the caisson height increasing process are significantly improved. By arranging the cofferdam main body which is installed in stages, the stability of the caisson during the two floating processes of floating to the wet dock and floating to the pier position is ensured, and a whole-process dry operation environment is provided for the caisson sitting on the bottom and increasing the height in the wet dock.

The invention discloses a grouting method for a reserved water stop groove of a force transfer plate of an immersed tube bottom plate, and belongs to the technical field of immersed tube tunnel construction. The method comprises the steps that before dry dock irrigation, a plurality of Q-type water stop belts are arranged on a force transmission plate in the transverse direction of a pipe joint, the Q-type water stop belts are sequentially arranged in parallel in the axial direction of the pipe joint, and a reserved water stop groove is formed between every two adjacent Q-type water stop belts; each reserved waterstop groove is transversely divided into at least one grouting subarea along the pipe joint, a grouting pipe is correspondingly arranged in each grouting subarea, and an embedded section of the grouting pipe is fixed on the force transmission plate and is parallel to the Q-shaped waterstop belt; after the final joint end pipe joint is installed, a gas injection test is conducted on the grouting pipe, and permeability is ensured; and grouting is conducted in sequence according to the preset grouting sequence of the reserved water stop grooves, and grouting is completed in sequence according to the preset grouting subarea grouting sequence in each reserved water stop groove. According to the grouting method for the reserved water stop groove of the force transfer plate of the immersed tube bottom plate, the waterproof reliability can be improved, and the long-term waterproof durability and the construction quality are guaranteed.

The invention relates to the technical field of dry dock construction, in particular to a dock entrance cofferdam structure, a dry dock system and a construction method.The cofferdam structure comprises an earth rock cofferdam arranged in a shallow water area, a prefabricated caisson arranged in a deep water area and a dock gate, one end of the earth rock cofferdam is connected with a revetment, and the other end of the earth rock cofferdam is connected with the prefabricated caisson; the end, away from the earth rock cofferdam, of the prefabricated caisson abuts against the dock gate, the end, away from the prefabricated caisson, of the dock gate abuts against the retaining dam, the earth rock cofferdam is used in a shallow water area to reduce the cost, the prefabricated caisson is used in a deep water area to reduce the amount of earth and stones in the deep water area, the cost is reduced, and the ecological influence is relieved. The original dock gate is utilized, normal use of the dock entrance is achieved by opening or closing the dock gate, the requirement for recovery after the dock entrance is widened is met, further, the waterproof curtain blocks the water seepage path of water in the earth rock cofferdam, the waterproof effect of the earth rock cofferdam is improved, and the water stop performance of the cofferdam structure is guaranteed.

The present application relates to the technical field of VLOC ship refitting methanol fuel tank, and proposes a VLOC ship refitting methanol fuel tank and a refitting method, which can cooperate with the deck opening sequence and size, adopt a special treatment method for the methanol fuel tank structure with deck pieces, assemble from the methanol fuel tank deck opening sequence, reinforce the deck while assembling, solve the problems of the whole lifting of the deck small opening section and the whole turning of the unmanned section, realize the purpose of not occupying the dry dock for the sectional refitting of the methanol fuel tank of the VLOC ship at the mooring wharf, increase the construction portability, improve the construction environment, and save the refitting cost.

The present invention relates to the technical field of ship repair equipment, and in particular to a floating dock. The floating dock is moored by a starboard pile-holding device. The floating dock includes a main hull, and a pump cabin is arranged on the starboard side of the main hull. The pump cabins are evenly distributed in the front and rear cabins of the main hull. At least two ballast pumps and at least two seawater tanks are arranged in each pump cabin. Each ballast pump controls five corresponding ballast tanks, and the two ballast pumps can be used as backups for each other through remote control butterfly valves. A sewage recovery system is also arranged in the main hull. The present invention has the following effects: it solves the problems that silt is sucked into the cabin and the water flow of the pump drainage impacts the seabed when the floating dock is in use, and it is convenient to collect the sewage generated during ship repair.

The present application belongs to the technical field of immersed tunnel engineering, and particularly relates to a soft stratum immersed tunnel dry dock foundation pit anchor cable force prediction method and system, comprising the following steps: S1: collecting relevant data of dry dock soft stratum, anchor cable and pumping and storage water circulation effect; S2: deriving a soft stratum creep model based on a nonlinear generalized Kelvin body model; S3: simulating and establishing an anchor cable axial force relaxation model according to the coupling effect of the anchor cable and the soft stratum; S4: constructing an anchor cable axial force evolution calculation equation according to the anchor cable axial force change under the pumping and storage water circulation effect; and S5: fitting and optimizing inherent coefficients in the axial force relaxation model according to test monitoring data. Through the anchor cable axial force change under the pumping and storage water circulation effect, an anchor cable axial force curve of the pumping and storage water disturbance process is established, which more truly reflects the actual stress condition of the anchor cable; and then the inherent coefficients in the axial force relaxation model are fitted and optimized through the monitoring data under the pumping and storage water circulation effect.

This invention relates to a floating barge loading and undocking method. By adjusting the draft of the wind turbine foundation, the draft of the first corner is made deeper than that of the two second corners, and the drafts of the two second corners are balanced. The draft of the first corner is higher than the top surface elevation of the support pier. This ensures that during the ascent of the semi-submersible barge, the first corner contacts the corresponding support pier on the semi-submersible barge first than the two symmetrical second corners, thus ensuring stress safety. When the corresponding support pier on the semi-submersible barge contacts the first corner, the ascent speed of the semi-submersible barge is reduced. The semi-submersible barge is controlled to rise at the reduced ascent speed until the other two second corners simultaneously contact the support pier at the widened stern of the semi-submersible barge. This further reduces the stress generated by the second corners when they subsequently contact the corresponding support pier on the semi-submersible barge, making the stress safety even better. This ensures the overall lateral balance of the semi-submersible barge and the wind turbine foundation after floating barge loading, and improves the stability control and safety of subsequent semi-submersible barge undocking and transport.

This invention discloses a multi-functional robot for ship maintenance and anti-piracy defense, belonging to the field of marine special robots and intelligent ship operation and maintenance technology. This multi-functional robot comprises two types of isomorphic modular robots: one type is a ship maintenance robot, equipped with underwater visual recognition, hull rust and dirt removal, flexible grinding, and localized spot coating functions, used for routine underwater anti-corrosion and anti-fouling maintenance of ships; the other type is a cutting and welding anti-piracy defense robot, integrating underwater cutting and welding mechanisms, capable of completing underwater damage repairs of ships, while simultaneously using the cutting mechanism to cut and stop pirate boarding boats, external components, and climbing devices, thus possessing both maintenance and anti-piracy defense functions. This invention adopts a robot division of labor and collaborative design. The maintenance end adopts a multi-machine collaborative operation mode, which is highly compatible with the self-developed multi-machine collaborative anti-corrosion and anti-fouling process. The maintenance and defense end realizes the integration of cutting, welding and anti-piracy functions. It has a reasonable structure, strong practicality and easy deployment. It can complete the entire process of underwater operation and maintenance and offshore security operations without stopping the ship or entering the dry dock. It is applicable to underwater maintenance and security defense of military and civilian ships throughout the entire life cycle and has significant market application value and creativity.

The invention relates to a dry dock for building and / or dismantling a navel structure, including a substantially horizontal floor that is located below a predetermined top level, dock side walls extending from the floor to the top level, a closable access being provided in a said side wall for moving a navel structure into the dock

The invention discloses a multifunctional tension leg deepwater wind power platform, and relates to the technical field of floating offshore wind power generation platforms. The system comprises a multifunctional caisson fixing foundation, a multifunctional elastic mooring tension leg and a multifunctional floating foundation. The multifunctional elastic mooring tension leg comprises a multifunctional elastic mooring support, a tension leg middle connector, a self-floating mooring steel pipe and a tension leg fixing connector. The multifunctional caisson fixing foundation comprises three ballast tanks and tension leg fixing joint supporting beams. The multifunctional floating foundation comprises three floating boxes, two ballast tanks, a truss tower, a lifting type stand column, a lifting type wind driven generator tower column and a multifunctional elastic mooring support supporting beam. Various prefabricated parts can be divided into two groups to be assembled in the same dry dock and then are towed to the sea in a self-floating mode, only three tugs, an air lift mud suction tool, an air compressor, a high-pressure water pump and other common construction equipment need to be used in the offshore installation period, and therefore the engineering investment can be greatly reduced while the safety and reliability are improved.

The invention discloses a self-preloading dock entrance supporting system and a construction method thereof, and belongs to the technical field of engineering supporting. According to the technical scheme, a steel pipe main support, a steel enclosing purlin and a latticed column form an assembly type frame structure, one end of the steel pipe main support is a fixed end, the other end of the steel pipe main support is a movable end, the movable end uses an intelligent pressurization node, and a sliding type support and an automatic prestress applying system are integrated. The sliding support achieves axial telescopic adjustment through a sliding guide rod and a limiting device, and the automatic prestress applying system comprises an intelligent control unit, a hydraulic module and a stress sensing system. The construction method comprises the steps of concrete support pouring, steel enclosing purlin and latticed column mounting, prefabricated support unit hoisting, prestress applying and monitoring, multi-layer support arrangement and the like. The temporary supporting device has the beneficial effects of being reasonable in structure, convenient to install, safe, efficient and suitable for temporary supporting in complex environments such as dry docks and foundation pits, and the construction efficiency and the structural safety are improved.

The application relates to a dry dock autonomous positioning and falling pier method based on a lifting pier device, which comprises the following steps: adopting a pier arrangement scheme generated by a shore computing control unit, selecting six groups of positioning piers in a matrix arranged lifting pier, determining a compensation height T according to a ship state and a ship size when the ship enters the dock, lifting the six groups of positioning piers to a set height H1+ the compensation height T, lifting the center girder pier in the flat bottom area, starting continuous drainage of the dock chamber, collecting and feeding back oil pressure signals of each positioning pier and the center girder pier to the shore computing control unit in real time, lifting all the lifting piers in the flat bottom area to a set height H, so that the ship is in a half-piered state, reading a ship roll and pitch state, judging whether the ship roll and pitch state meets the construction requirements, reading the ship roll and pitch state when the ship completely falls to the pier, judging whether the ship roll and pitch state meets the construction requirements, draining the water in the dock chamber, and tightly pulling the additional fixed support lifting piers, so that the ship completes the autonomous positioning and falling pier in the dock.